Andreas Grün / Mbed 2 deprecated madplayer

MP3 Player without external hardware MP3 Player without external hardware. A software based MP3 player based on a modified version of libmad. Mono output (at the moment) via AnalogOut. Files are read from an USB drive. This is a demo program, it plays only one file at the moment. Documentation is in "main.cpp" and "config.h"

Dependencies:   mbed

layer3.cpp@2:f28cf0afd021, 2010-11-27 (annotated)

Committer:
Gruenfrosch
Date:
Sat Nov 27 17:27:33 2010 +0000
Revision:
2:f28cf0afd021
Parent:
0:7627c79db971 
Version 3:

 * moved another memory block into AHB RAM, giving more room for

 * stereo buffer.

 * moved content of decode() to main()

 * decoding	is now safe to be called multiple times (bug in older versions)

 * Output routine now fills stereo buffer, DAC output sums channels,

 * just for demonstration that stereo output could go here

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Gruenfrosch 0:7627c79db971 1 /*
Gruenfrosch 0:7627c79db971 2 * libmad - MPEG audio decoder library
Gruenfrosch 0:7627c79db971 3 * Copyright (C) 2000-2004 Underbit Technologies, Inc.
Gruenfrosch 0:7627c79db971 4 *
Gruenfrosch 0:7627c79db971 5 * This program is free software; you can redistribute it and/or modify
Gruenfrosch 0:7627c79db971 6 * it under the terms of the GNU General Public License as published by
Gruenfrosch 0:7627c79db971 7 * the Free Software Foundation; either version 2 of the License, or
Gruenfrosch 0:7627c79db971 8 * (at your option) any later version.
Gruenfrosch 0:7627c79db971 9 *
Gruenfrosch 0:7627c79db971 10 * This program is distributed in the hope that it will be useful,
Gruenfrosch 0:7627c79db971 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Gruenfrosch 0:7627c79db971 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Gruenfrosch 0:7627c79db971 13 * GNU General Public License for more details.
Gruenfrosch 0:7627c79db971 14 *
Gruenfrosch 0:7627c79db971 15 * You should have received a copy of the GNU General Public License
Gruenfrosch 0:7627c79db971 16 * along with this program; if not, write to the Free Software
Gruenfrosch 0:7627c79db971 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Gruenfrosch 0:7627c79db971 18 *
Gruenfrosch 0:7627c79db971 19 * $Id: layer3.c,v 1.1 2010/11/23 20:12:57 andy Exp $
Gruenfrosch 0:7627c79db971 20 */
Gruenfrosch 0:7627c79db971 21
Gruenfrosch 0:7627c79db971 22 # include "config.h"
Gruenfrosch 0:7627c79db971 23
Gruenfrosch 0:7627c79db971 24 # include "global.h"
Gruenfrosch 0:7627c79db971 25
Gruenfrosch 0:7627c79db971 26 # include <stdlib.h>
Gruenfrosch 0:7627c79db971 27 # include <string.h>
Gruenfrosch 0:7627c79db971 28
Gruenfrosch 0:7627c79db971 29 # ifdef HAVE_LIMITS_H
Gruenfrosch 0:7627c79db971 30 # include <limits.h>
Gruenfrosch 0:7627c79db971 31 # else
Gruenfrosch 0:7627c79db971 32 # define CHAR_BIT 8
Gruenfrosch 0:7627c79db971 33 # endif
Gruenfrosch 0:7627c79db971 34
Gruenfrosch 0:7627c79db971 35 # include "fixed.h"
Gruenfrosch 0:7627c79db971 36 # include "bit.h"
Gruenfrosch 0:7627c79db971 37 # include "stream.h"
Gruenfrosch 0:7627c79db971 38 # include "frame.h"
Gruenfrosch 0:7627c79db971 39 # include "huffman.h"
Gruenfrosch 0:7627c79db971 40 # include "layer3.h"
Gruenfrosch 0:7627c79db971 41
Gruenfrosch 0:7627c79db971 42 /* --- Layer III ----------------------------------------------------------- */
Gruenfrosch 0:7627c79db971 43
Gruenfrosch 0:7627c79db971 44 enum {
Gruenfrosch 0:7627c79db971 45 count1table_select = 0x01,
Gruenfrosch 0:7627c79db971 46 scalefac_scale = 0x02,
Gruenfrosch 0:7627c79db971 47 preflag = 0x04,
Gruenfrosch 0:7627c79db971 48 mixed_block_flag = 0x08
Gruenfrosch 0:7627c79db971 49 };
Gruenfrosch 0:7627c79db971 50
Gruenfrosch 0:7627c79db971 51 enum {
Gruenfrosch 0:7627c79db971 52 I_STEREO = 0x1,
Gruenfrosch 0:7627c79db971 53 MS_STEREO = 0x2
Gruenfrosch 0:7627c79db971 54 };
Gruenfrosch 0:7627c79db971 55
Gruenfrosch 0:7627c79db971 56
Gruenfrosch 0:7627c79db971 57 struct channel {
Gruenfrosch 0:7627c79db971 58 /* from side info */
Gruenfrosch 0:7627c79db971 59 unsigned short part2_3_length;
Gruenfrosch 0:7627c79db971 60 unsigned short big_values;
Gruenfrosch 0:7627c79db971 61 unsigned short global_gain;
Gruenfrosch 0:7627c79db971 62 unsigned short scalefac_compress;
Gruenfrosch 0:7627c79db971 63
Gruenfrosch 0:7627c79db971 64 unsigned char flags;
Gruenfrosch 0:7627c79db971 65 unsigned char block_type;
Gruenfrosch 0:7627c79db971 66 unsigned char table_select[3];
Gruenfrosch 0:7627c79db971 67 unsigned char subblock_gain[3];
Gruenfrosch 0:7627c79db971 68 unsigned char region0_count;
Gruenfrosch 0:7627c79db971 69 unsigned char region1_count;
Gruenfrosch 0:7627c79db971 70
Gruenfrosch 0:7627c79db971 71 /* from main_data */
Gruenfrosch 0:7627c79db971 72 unsigned char scalefac[39]; /* scalefac_l and/or scalefac_s */
Gruenfrosch 0:7627c79db971 73 };
Gruenfrosch 0:7627c79db971 74 struct granule {
Gruenfrosch 0:7627c79db971 75 struct channel ch[2];
Gruenfrosch 0:7627c79db971 76 };
Gruenfrosch 0:7627c79db971 77
Gruenfrosch 0:7627c79db971 78
Gruenfrosch 0:7627c79db971 79 struct sideinfo {
Gruenfrosch 0:7627c79db971 80 unsigned int main_data_begin;
Gruenfrosch 0:7627c79db971 81 unsigned int private_bits;
Gruenfrosch 0:7627c79db971 82
Gruenfrosch 0:7627c79db971 83 unsigned char scfsi[2];
Gruenfrosch 0:7627c79db971 84
Gruenfrosch 0:7627c79db971 85 struct granule gr[2];
Gruenfrosch 0:7627c79db971 86 };
Gruenfrosch 0:7627c79db971 87
Gruenfrosch 0:7627c79db971 88 /*
Gruenfrosch 0:7627c79db971 89 * scalefactor bit lengths
Gruenfrosch 0:7627c79db971 90 * derived from section 2.4.2.7 of ISO/IEC 11172-3
Gruenfrosch 0:7627c79db971 91 */
Gruenfrosch 0:7627c79db971 92 static
Gruenfrosch 0:7627c79db971 93 struct {
Gruenfrosch 0:7627c79db971 94 unsigned char slen1;
Gruenfrosch 0:7627c79db971 95 unsigned char slen2;
Gruenfrosch 0:7627c79db971 96 } const sflen_table[16] = {
Gruenfrosch 0:7627c79db971 97 { 0, 0 }, { 0, 1 }, { 0, 2 }, { 0, 3 },
Gruenfrosch 0:7627c79db971 98 { 3, 0 }, { 1, 1 }, { 1, 2 }, { 1, 3 },
Gruenfrosch 0:7627c79db971 99 { 2, 1 }, { 2, 2 }, { 2, 3 }, { 3, 1 },
Gruenfrosch 0:7627c79db971 100 { 3, 2 }, { 3, 3 }, { 4, 2 }, { 4, 3 }
Gruenfrosch 0:7627c79db971 101 };
Gruenfrosch 0:7627c79db971 102
Gruenfrosch 0:7627c79db971 103 /*
Gruenfrosch 0:7627c79db971 104 * number of LSF scalefactor band values
Gruenfrosch 0:7627c79db971 105 * derived from section 2.4.3.2 of ISO/IEC 13818-3
Gruenfrosch 0:7627c79db971 106 */
Gruenfrosch 0:7627c79db971 107 static
Gruenfrosch 0:7627c79db971 108 unsigned char const nsfb_table[6][3][4] = {
Gruenfrosch 0:7627c79db971 109 { { 6, 5, 5, 5 },
Gruenfrosch 0:7627c79db971 110 { 9, 9, 9, 9 },
Gruenfrosch 0:7627c79db971 111 { 6, 9, 9, 9 } },
Gruenfrosch 0:7627c79db971 112
Gruenfrosch 0:7627c79db971 113 { { 6, 5, 7, 3 },
Gruenfrosch 0:7627c79db971 114 { 9, 9, 12, 6 },
Gruenfrosch 0:7627c79db971 115 { 6, 9, 12, 6 } },
Gruenfrosch 0:7627c79db971 116
Gruenfrosch 0:7627c79db971 117 { { 11, 10, 0, 0 },
Gruenfrosch 0:7627c79db971 118 { 18, 18, 0, 0 },
Gruenfrosch 0:7627c79db971 119 { 15, 18, 0, 0 } },
Gruenfrosch 0:7627c79db971 120
Gruenfrosch 0:7627c79db971 121 { { 7, 7, 7, 0 },
Gruenfrosch 0:7627c79db971 122 { 12, 12, 12, 0 },
Gruenfrosch 0:7627c79db971 123 { 6, 15, 12, 0 } },
Gruenfrosch 0:7627c79db971 124
Gruenfrosch 0:7627c79db971 125 { { 6, 6, 6, 3 },
Gruenfrosch 0:7627c79db971 126 { 12, 9, 9, 6 },
Gruenfrosch 0:7627c79db971 127 { 6, 12, 9, 6 } },
Gruenfrosch 0:7627c79db971 128
Gruenfrosch 0:7627c79db971 129 { { 8, 8, 5, 0 },
Gruenfrosch 0:7627c79db971 130 { 15, 12, 9, 0 },
Gruenfrosch 0:7627c79db971 131 { 6, 18, 9, 0 } }
Gruenfrosch 0:7627c79db971 132 };
Gruenfrosch 0:7627c79db971 133
Gruenfrosch 0:7627c79db971 134 /*
Gruenfrosch 0:7627c79db971 135 * MPEG-1 scalefactor band widths
Gruenfrosch 0:7627c79db971 136 * derived from Table B.8 of ISO/IEC 11172-3
Gruenfrosch 0:7627c79db971 137 */
Gruenfrosch 0:7627c79db971 138 static
Gruenfrosch 0:7627c79db971 139 unsigned char const sfb_48000_long[] = {
Gruenfrosch 0:7627c79db971 140 4, 4, 4, 4, 4, 4, 6, 6, 6, 8, 10,
Gruenfrosch 0:7627c79db971 141 12, 16, 18, 22, 28, 34, 40, 46, 54, 54, 192
Gruenfrosch 0:7627c79db971 142 };
Gruenfrosch 0:7627c79db971 143
Gruenfrosch 0:7627c79db971 144 static
Gruenfrosch 0:7627c79db971 145 unsigned char const sfb_44100_long[] = {
Gruenfrosch 0:7627c79db971 146 4, 4, 4, 4, 4, 4, 6, 6, 8, 8, 10,
Gruenfrosch 0:7627c79db971 147 12, 16, 20, 24, 28, 34, 42, 50, 54, 76, 158
Gruenfrosch 0:7627c79db971 148 };
Gruenfrosch 0:7627c79db971 149
Gruenfrosch 0:7627c79db971 150 static
Gruenfrosch 0:7627c79db971 151 unsigned char const sfb_32000_long[] = {
Gruenfrosch 0:7627c79db971 152 4, 4, 4, 4, 4, 4, 6, 6, 8, 10, 12,
Gruenfrosch 0:7627c79db971 153 16, 20, 24, 30, 38, 46, 56, 68, 84, 102, 26
Gruenfrosch 0:7627c79db971 154 };
Gruenfrosch 0:7627c79db971 155
Gruenfrosch 0:7627c79db971 156 static
Gruenfrosch 0:7627c79db971 157 unsigned char const sfb_48000_short[] = {
Gruenfrosch 0:7627c79db971 158 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6,
Gruenfrosch 0:7627c79db971 159 6, 6, 6, 6, 6, 10, 10, 10, 12, 12, 12, 14, 14,
Gruenfrosch 0:7627c79db971 160 14, 16, 16, 16, 20, 20, 20, 26, 26, 26, 66, 66, 66
Gruenfrosch 0:7627c79db971 161 };
Gruenfrosch 0:7627c79db971 162
Gruenfrosch 0:7627c79db971 163 static
Gruenfrosch 0:7627c79db971 164 unsigned char const sfb_44100_short[] = {
Gruenfrosch 0:7627c79db971 165 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6,
Gruenfrosch 0:7627c79db971 166 6, 6, 8, 8, 8, 10, 10, 10, 12, 12, 12, 14, 14,
Gruenfrosch 0:7627c79db971 167 14, 18, 18, 18, 22, 22, 22, 30, 30, 30, 56, 56, 56
Gruenfrosch 0:7627c79db971 168 };
Gruenfrosch 0:7627c79db971 169
Gruenfrosch 0:7627c79db971 170 static
Gruenfrosch 0:7627c79db971 171 unsigned char const sfb_32000_short[] = {
Gruenfrosch 0:7627c79db971 172 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6,
Gruenfrosch 0:7627c79db971 173 6, 6, 8, 8, 8, 12, 12, 12, 16, 16, 16, 20, 20,
Gruenfrosch 0:7627c79db971 174 20, 26, 26, 26, 34, 34, 34, 42, 42, 42, 12, 12, 12
Gruenfrosch 0:7627c79db971 175 };
Gruenfrosch 0:7627c79db971 176
Gruenfrosch 0:7627c79db971 177 static
Gruenfrosch 0:7627c79db971 178 unsigned char const sfb_48000_mixed[] = {
Gruenfrosch 0:7627c79db971 179 /* long */ 4, 4, 4, 4, 4, 4, 6, 6,
Gruenfrosch 0:7627c79db971 180 /* short */ 4, 4, 4, 6, 6, 6, 6, 6, 6, 10,
Gruenfrosch 0:7627c79db971 181 10, 10, 12, 12, 12, 14, 14, 14, 16, 16,
Gruenfrosch 0:7627c79db971 182 16, 20, 20, 20, 26, 26, 26, 66, 66, 66
Gruenfrosch 0:7627c79db971 183 };
Gruenfrosch 0:7627c79db971 184
Gruenfrosch 0:7627c79db971 185 static
Gruenfrosch 0:7627c79db971 186 unsigned char const sfb_44100_mixed[] = {
Gruenfrosch 0:7627c79db971 187 /* long */ 4, 4, 4, 4, 4, 4, 6, 6,
Gruenfrosch 0:7627c79db971 188 /* short */ 4, 4, 4, 6, 6, 6, 8, 8, 8, 10,
Gruenfrosch 0:7627c79db971 189 10, 10, 12, 12, 12, 14, 14, 14, 18, 18,
Gruenfrosch 0:7627c79db971 190 18, 22, 22, 22, 30, 30, 30, 56, 56, 56
Gruenfrosch 0:7627c79db971 191 };
Gruenfrosch 0:7627c79db971 192
Gruenfrosch 0:7627c79db971 193 static
Gruenfrosch 0:7627c79db971 194 unsigned char const sfb_32000_mixed[] = {
Gruenfrosch 0:7627c79db971 195 /* long */ 4, 4, 4, 4, 4, 4, 6, 6,
Gruenfrosch 0:7627c79db971 196 /* short */ 4, 4, 4, 6, 6, 6, 8, 8, 8, 12,
Gruenfrosch 0:7627c79db971 197 12, 12, 16, 16, 16, 20, 20, 20, 26, 26,
Gruenfrosch 0:7627c79db971 198 26, 34, 34, 34, 42, 42, 42, 12, 12, 12
Gruenfrosch 0:7627c79db971 199 };
Gruenfrosch 0:7627c79db971 200
Gruenfrosch 0:7627c79db971 201 /*
Gruenfrosch 0:7627c79db971 202 * MPEG-2 scalefactor band widths
Gruenfrosch 0:7627c79db971 203 * derived from Table B.2 of ISO/IEC 13818-3
Gruenfrosch 0:7627c79db971 204 */
Gruenfrosch 0:7627c79db971 205 static
Gruenfrosch 0:7627c79db971 206 unsigned char const sfb_24000_long[] = {
Gruenfrosch 0:7627c79db971 207 6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16,
Gruenfrosch 0:7627c79db971 208 18, 22, 26, 32, 38, 46, 54, 62, 70, 76, 36
Gruenfrosch 0:7627c79db971 209 };
Gruenfrosch 0:7627c79db971 210
Gruenfrosch 0:7627c79db971 211 static
Gruenfrosch 0:7627c79db971 212 unsigned char const sfb_22050_long[] = {
Gruenfrosch 0:7627c79db971 213 6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16,
Gruenfrosch 0:7627c79db971 214 20, 24, 28, 32, 38, 46, 52, 60, 68, 58, 54
Gruenfrosch 0:7627c79db971 215 };
Gruenfrosch 0:7627c79db971 216
Gruenfrosch 0:7627c79db971 217 # define sfb_16000_long sfb_22050_long
Gruenfrosch 0:7627c79db971 218
Gruenfrosch 0:7627c79db971 219 static
Gruenfrosch 0:7627c79db971 220 unsigned char const sfb_24000_short[] = {
Gruenfrosch 0:7627c79db971 221 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 8,
Gruenfrosch 0:7627c79db971 222 8, 8, 10, 10, 10, 12, 12, 12, 14, 14, 14, 18, 18,
Gruenfrosch 0:7627c79db971 223 18, 24, 24, 24, 32, 32, 32, 44, 44, 44, 12, 12, 12
Gruenfrosch 0:7627c79db971 224 };
Gruenfrosch 0:7627c79db971 225
Gruenfrosch 0:7627c79db971 226 static
Gruenfrosch 0:7627c79db971 227 unsigned char const sfb_22050_short[] = {
Gruenfrosch 0:7627c79db971 228 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6,
Gruenfrosch 0:7627c79db971 229 6, 6, 8, 8, 8, 10, 10, 10, 14, 14, 14, 18, 18,
Gruenfrosch 0:7627c79db971 230 18, 26, 26, 26, 32, 32, 32, 42, 42, 42, 18, 18, 18
Gruenfrosch 0:7627c79db971 231 };
Gruenfrosch 0:7627c79db971 232
Gruenfrosch 0:7627c79db971 233 static
Gruenfrosch 0:7627c79db971 234 unsigned char const sfb_16000_short[] = {
Gruenfrosch 0:7627c79db971 235 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 8,
Gruenfrosch 0:7627c79db971 236 8, 8, 10, 10, 10, 12, 12, 12, 14, 14, 14, 18, 18,
Gruenfrosch 0:7627c79db971 237 18, 24, 24, 24, 30, 30, 30, 40, 40, 40, 18, 18, 18
Gruenfrosch 0:7627c79db971 238 };
Gruenfrosch 0:7627c79db971 239
Gruenfrosch 0:7627c79db971 240 static
Gruenfrosch 0:7627c79db971 241 unsigned char const sfb_24000_mixed[] = {
Gruenfrosch 0:7627c79db971 242 /* long */ 6, 6, 6, 6, 6, 6,
Gruenfrosch 0:7627c79db971 243 /* short */ 6, 6, 6, 8, 8, 8, 10, 10, 10, 12,
Gruenfrosch 0:7627c79db971 244 12, 12, 14, 14, 14, 18, 18, 18, 24, 24,
Gruenfrosch 0:7627c79db971 245 24, 32, 32, 32, 44, 44, 44, 12, 12, 12
Gruenfrosch 0:7627c79db971 246 };
Gruenfrosch 0:7627c79db971 247
Gruenfrosch 0:7627c79db971 248 static
Gruenfrosch 0:7627c79db971 249 unsigned char const sfb_22050_mixed[] = {
Gruenfrosch 0:7627c79db971 250 /* long */ 6, 6, 6, 6, 6, 6,
Gruenfrosch 0:7627c79db971 251 /* short */ 6, 6, 6, 6, 6, 6, 8, 8, 8, 10,
Gruenfrosch 0:7627c79db971 252 10, 10, 14, 14, 14, 18, 18, 18, 26, 26,
Gruenfrosch 0:7627c79db971 253 26, 32, 32, 32, 42, 42, 42, 18, 18, 18
Gruenfrosch 0:7627c79db971 254 };
Gruenfrosch 0:7627c79db971 255
Gruenfrosch 0:7627c79db971 256 static
Gruenfrosch 0:7627c79db971 257 unsigned char const sfb_16000_mixed[] = {
Gruenfrosch 0:7627c79db971 258 /* long */ 6, 6, 6, 6, 6, 6,
Gruenfrosch 0:7627c79db971 259 /* short */ 6, 6, 6, 8, 8, 8, 10, 10, 10, 12,
Gruenfrosch 0:7627c79db971 260 12, 12, 14, 14, 14, 18, 18, 18, 24, 24,
Gruenfrosch 0:7627c79db971 261 24, 30, 30, 30, 40, 40, 40, 18, 18, 18
Gruenfrosch 0:7627c79db971 262 };
Gruenfrosch 0:7627c79db971 263
Gruenfrosch 0:7627c79db971 264 /*
Gruenfrosch 0:7627c79db971 265 * MPEG 2.5 scalefactor band widths
Gruenfrosch 0:7627c79db971 266 * derived from public sources
Gruenfrosch 0:7627c79db971 267 */
Gruenfrosch 0:7627c79db971 268 # define sfb_12000_long sfb_16000_long
Gruenfrosch 0:7627c79db971 269 # define sfb_11025_long sfb_12000_long
Gruenfrosch 0:7627c79db971 270
Gruenfrosch 0:7627c79db971 271 static
Gruenfrosch 0:7627c79db971 272 unsigned char const sfb_8000_long[] = {
Gruenfrosch 0:7627c79db971 273 12, 12, 12, 12, 12, 12, 16, 20, 24, 28, 32,
Gruenfrosch 0:7627c79db971 274 40, 48, 56, 64, 76, 90, 2, 2, 2, 2, 2
Gruenfrosch 0:7627c79db971 275 };
Gruenfrosch 0:7627c79db971 276
Gruenfrosch 0:7627c79db971 277 # define sfb_12000_short sfb_16000_short
Gruenfrosch 0:7627c79db971 278 # define sfb_11025_short sfb_12000_short
Gruenfrosch 0:7627c79db971 279
Gruenfrosch 0:7627c79db971 280 static
Gruenfrosch 0:7627c79db971 281 unsigned char const sfb_8000_short[] = {
Gruenfrosch 0:7627c79db971 282 8, 8, 8, 8, 8, 8, 8, 8, 8, 12, 12, 12, 16,
Gruenfrosch 0:7627c79db971 283 16, 16, 20, 20, 20, 24, 24, 24, 28, 28, 28, 36, 36,
Gruenfrosch 0:7627c79db971 284 36, 2, 2, 2, 2, 2, 2, 2, 2, 2, 26, 26, 26
Gruenfrosch 0:7627c79db971 285 };
Gruenfrosch 0:7627c79db971 286
Gruenfrosch 0:7627c79db971 287 # define sfb_12000_mixed sfb_16000_mixed
Gruenfrosch 0:7627c79db971 288 # define sfb_11025_mixed sfb_12000_mixed
Gruenfrosch 0:7627c79db971 289
Gruenfrosch 0:7627c79db971 290 /* the 8000 Hz short block scalefactor bands do not break after
Gruenfrosch 0:7627c79db971 291 the first 36 frequency lines, so this is probably wrong */
Gruenfrosch 0:7627c79db971 292 static
Gruenfrosch 0:7627c79db971 293 unsigned char const sfb_8000_mixed[] = {
Gruenfrosch 0:7627c79db971 294 /* long */ 12, 12, 12,
Gruenfrosch 0:7627c79db971 295 /* short */ 4, 4, 4, 8, 8, 8, 12, 12, 12, 16, 16, 16,
Gruenfrosch 0:7627c79db971 296 20, 20, 20, 24, 24, 24, 28, 28, 28, 36, 36, 36,
Gruenfrosch 0:7627c79db971 297 2, 2, 2, 2, 2, 2, 2, 2, 2, 26, 26, 26
Gruenfrosch 0:7627c79db971 298 };
Gruenfrosch 0:7627c79db971 299
Gruenfrosch 0:7627c79db971 300 static
Gruenfrosch 0:7627c79db971 301 struct {
Gruenfrosch 0:7627c79db971 302 unsigned char const *l;
Gruenfrosch 0:7627c79db971 303 unsigned char const *s;
Gruenfrosch 0:7627c79db971 304 unsigned char const *m;
Gruenfrosch 0:7627c79db971 305 } const sfbwidth_table[9] = {
Gruenfrosch 0:7627c79db971 306 { sfb_48000_long, sfb_48000_short, sfb_48000_mixed },
Gruenfrosch 0:7627c79db971 307 { sfb_44100_long, sfb_44100_short, sfb_44100_mixed },
Gruenfrosch 0:7627c79db971 308 { sfb_32000_long, sfb_32000_short, sfb_32000_mixed },
Gruenfrosch 0:7627c79db971 309 { sfb_24000_long, sfb_24000_short, sfb_24000_mixed },
Gruenfrosch 0:7627c79db971 310 { sfb_22050_long, sfb_22050_short, sfb_22050_mixed },
Gruenfrosch 0:7627c79db971 311 { sfb_16000_long, sfb_16000_short, sfb_16000_mixed },
Gruenfrosch 0:7627c79db971 312 { sfb_12000_long, sfb_12000_short, sfb_12000_mixed },
Gruenfrosch 0:7627c79db971 313 { sfb_11025_long, sfb_11025_short, sfb_11025_mixed },
Gruenfrosch 0:7627c79db971 314 { sfb_8000_long, sfb_8000_short, sfb_8000_mixed }
Gruenfrosch 0:7627c79db971 315 };
Gruenfrosch 0:7627c79db971 316
Gruenfrosch 0:7627c79db971 317 /*
Gruenfrosch 0:7627c79db971 318 * scalefactor band preemphasis (used only when preflag is set)
Gruenfrosch 0:7627c79db971 319 * derived from Table B.6 of ISO/IEC 11172-3
Gruenfrosch 0:7627c79db971 320 */
Gruenfrosch 0:7627c79db971 321 static
Gruenfrosch 0:7627c79db971 322 unsigned char const pretab[22] = {
Gruenfrosch 0:7627c79db971 323 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 0
Gruenfrosch 0:7627c79db971 324 };
Gruenfrosch 0:7627c79db971 325
Gruenfrosch 0:7627c79db971 326 /*
Gruenfrosch 0:7627c79db971 327 * table for requantization
Gruenfrosch 0:7627c79db971 328 *
Gruenfrosch 0:7627c79db971 329 * rq_table[x].mantissa * 2^(rq_table[x].exponent) = x^(4/3)
Gruenfrosch 0:7627c79db971 330 */
Gruenfrosch 0:7627c79db971 331 static
Gruenfrosch 0:7627c79db971 332 struct fixedfloat {
Gruenfrosch 0:7627c79db971 333 unsigned long mantissa : 27;
Gruenfrosch 0:7627c79db971 334 unsigned short exponent : 5;
Gruenfrosch 0:7627c79db971 335 } const rq_table[8207] = {
Gruenfrosch 0:7627c79db971 336 # include "rq_table.h"
Gruenfrosch 0:7627c79db971 337 };
Gruenfrosch 0:7627c79db971 338
Gruenfrosch 0:7627c79db971 339 /*
Gruenfrosch 0:7627c79db971 340 * fractional powers of two
Gruenfrosch 0:7627c79db971 341 * used for requantization and joint stereo decoding
Gruenfrosch 0:7627c79db971 342 *
Gruenfrosch 0:7627c79db971 343 * root_table[3 + x] = 2^(x/4)
Gruenfrosch 0:7627c79db971 344 */
Gruenfrosch 0:7627c79db971 345 static
Gruenfrosch 0:7627c79db971 346 mad_fixed_t const root_table[7] = {
Gruenfrosch 0:7627c79db971 347 MAD_F(0x09837f05) /* 2^(-3/4) == 0.59460355750136 */,
Gruenfrosch 0:7627c79db971 348 MAD_F(0x0b504f33) /* 2^(-2/4) == 0.70710678118655 */,
Gruenfrosch 0:7627c79db971 349 MAD_F(0x0d744fcd) /* 2^(-1/4) == 0.84089641525371 */,
Gruenfrosch 0:7627c79db971 350 MAD_F(0x10000000) /* 2^( 0/4) == 1.00000000000000 */,
Gruenfrosch 0:7627c79db971 351 MAD_F(0x1306fe0a) /* 2^(+1/4) == 1.18920711500272 */,
Gruenfrosch 0:7627c79db971 352 MAD_F(0x16a09e66) /* 2^(+2/4) == 1.41421356237310 */,
Gruenfrosch 0:7627c79db971 353 MAD_F(0x1ae89f99) /* 2^(+3/4) == 1.68179283050743 */
Gruenfrosch 0:7627c79db971 354 };
Gruenfrosch 0:7627c79db971 355
Gruenfrosch 0:7627c79db971 356 /*
Gruenfrosch 0:7627c79db971 357 * coefficients for aliasing reduction
Gruenfrosch 0:7627c79db971 358 * derived from Table B.9 of ISO/IEC 11172-3
Gruenfrosch 0:7627c79db971 359 *
Gruenfrosch 0:7627c79db971 360 * c[] = { -0.6, -0.535, -0.33, -0.185, -0.095, -0.041, -0.0142, -0.0037 }
Gruenfrosch 0:7627c79db971 361 * cs[i] = 1 / sqrt(1 + c[i]^2)
Gruenfrosch 0:7627c79db971 362 * ca[i] = c[i] / sqrt(1 + c[i]^2)
Gruenfrosch 0:7627c79db971 363 */
Gruenfrosch 0:7627c79db971 364 static
Gruenfrosch 0:7627c79db971 365 mad_fixed_t const cs[8] = {
Gruenfrosch 0:7627c79db971 366 +MAD_F(0x0db84a81) /* +0.857492926 */, +MAD_F(0x0e1b9d7f) /* +0.881741997 */,
Gruenfrosch 0:7627c79db971 367 +MAD_F(0x0f31adcf) /* +0.949628649 */, +MAD_F(0x0fbba815) /* +0.983314592 */,
Gruenfrosch 0:7627c79db971 368 +MAD_F(0x0feda417) /* +0.995517816 */, +MAD_F(0x0ffc8fc8) /* +0.999160558 */,
Gruenfrosch 0:7627c79db971 369 +MAD_F(0x0fff964c) /* +0.999899195 */, +MAD_F(0x0ffff8d3) /* +0.999993155 */
Gruenfrosch 0:7627c79db971 370 };
Gruenfrosch 0:7627c79db971 371
Gruenfrosch 0:7627c79db971 372 static
Gruenfrosch 0:7627c79db971 373 mad_fixed_t const ca[8] = {
Gruenfrosch 0:7627c79db971 374 -MAD_F(0x083b5fe7) /* -0.514495755 */, -MAD_F(0x078c36d2) /* -0.471731969 */,
Gruenfrosch 0:7627c79db971 375 -MAD_F(0x05039814) /* -0.313377454 */, -MAD_F(0x02e91dd1) /* -0.181913200 */,
Gruenfrosch 0:7627c79db971 376 -MAD_F(0x0183603a) /* -0.094574193 */, -MAD_F(0x00a7cb87) /* -0.040965583 */,
Gruenfrosch 0:7627c79db971 377 -MAD_F(0x003a2847) /* -0.014198569 */, -MAD_F(0x000f27b4) /* -0.003699975 */
Gruenfrosch 0:7627c79db971 378 };
Gruenfrosch 0:7627c79db971 379
Gruenfrosch 0:7627c79db971 380 /*
Gruenfrosch 0:7627c79db971 381 * IMDCT coefficients for short blocks
Gruenfrosch 0:7627c79db971 382 * derived from section 2.4.3.4.10.2 of ISO/IEC 11172-3
Gruenfrosch 0:7627c79db971 383 *
Gruenfrosch 0:7627c79db971 384 * imdct_s[i/even][k] = cos((PI / 24) * (2 * (i / 2) + 7) * (2 * k + 1))
Gruenfrosch 0:7627c79db971 385 * imdct_s[i /odd][k] = cos((PI / 24) * (2 * (6 + (i-1)/2) + 7) * (2 * k + 1))
Gruenfrosch 0:7627c79db971 386 */
Gruenfrosch 0:7627c79db971 387 static
Gruenfrosch 0:7627c79db971 388 mad_fixed_t const imdct_s[6][6] = {
Gruenfrosch 0:7627c79db971 389 # include "imdct_s.h"
Gruenfrosch 0:7627c79db971 390 };
Gruenfrosch 0:7627c79db971 391
Gruenfrosch 0:7627c79db971 392 # if !defined(ASO_IMDCT)
Gruenfrosch 0:7627c79db971 393 /*
Gruenfrosch 0:7627c79db971 394 * windowing coefficients for long blocks
Gruenfrosch 0:7627c79db971 395 * derived from section 2.4.3.4.10.3 of ISO/IEC 11172-3
Gruenfrosch 0:7627c79db971 396 *
Gruenfrosch 0:7627c79db971 397 * window_l[i] = sin((PI / 36) * (i + 1/2))
Gruenfrosch 0:7627c79db971 398 */
Gruenfrosch 0:7627c79db971 399 static
Gruenfrosch 0:7627c79db971 400 mad_fixed_t const window_l[36] = {
Gruenfrosch 0:7627c79db971 401 MAD_F(0x00b2aa3e) /* 0.043619387 */, MAD_F(0x0216a2a2) /* 0.130526192 */,
Gruenfrosch 0:7627c79db971 402 MAD_F(0x03768962) /* 0.216439614 */, MAD_F(0x04cfb0e2) /* 0.300705800 */,
Gruenfrosch 0:7627c79db971 403 MAD_F(0x061f78aa) /* 0.382683432 */, MAD_F(0x07635284) /* 0.461748613 */,
Gruenfrosch 0:7627c79db971 404 MAD_F(0x0898c779) /* 0.537299608 */, MAD_F(0x09bd7ca0) /* 0.608761429 */,
Gruenfrosch 0:7627c79db971 405 MAD_F(0x0acf37ad) /* 0.675590208 */, MAD_F(0x0bcbe352) /* 0.737277337 */,
Gruenfrosch 0:7627c79db971 406 MAD_F(0x0cb19346) /* 0.793353340 */, MAD_F(0x0d7e8807) /* 0.843391446 */,
Gruenfrosch 0:7627c79db971 407
Gruenfrosch 0:7627c79db971 408 MAD_F(0x0e313245) /* 0.887010833 */, MAD_F(0x0ec835e8) /* 0.923879533 */,
Gruenfrosch 0:7627c79db971 409 MAD_F(0x0f426cb5) /* 0.953716951 */, MAD_F(0x0f9ee890) /* 0.976296007 */,
Gruenfrosch 0:7627c79db971 410 MAD_F(0x0fdcf549) /* 0.991444861 */, MAD_F(0x0ffc19fd) /* 0.999048222 */,
Gruenfrosch 0:7627c79db971 411 MAD_F(0x0ffc19fd) /* 0.999048222 */, MAD_F(0x0fdcf549) /* 0.991444861 */,
Gruenfrosch 0:7627c79db971 412 MAD_F(0x0f9ee890) /* 0.976296007 */, MAD_F(0x0f426cb5) /* 0.953716951 */,
Gruenfrosch 0:7627c79db971 413 MAD_F(0x0ec835e8) /* 0.923879533 */, MAD_F(0x0e313245) /* 0.887010833 */,
Gruenfrosch 0:7627c79db971 414
Gruenfrosch 0:7627c79db971 415 MAD_F(0x0d7e8807) /* 0.843391446 */, MAD_F(0x0cb19346) /* 0.793353340 */,
Gruenfrosch 0:7627c79db971 416 MAD_F(0x0bcbe352) /* 0.737277337 */, MAD_F(0x0acf37ad) /* 0.675590208 */,
Gruenfrosch 0:7627c79db971 417 MAD_F(0x09bd7ca0) /* 0.608761429 */, MAD_F(0x0898c779) /* 0.537299608 */,
Gruenfrosch 0:7627c79db971 418 MAD_F(0x07635284) /* 0.461748613 */, MAD_F(0x061f78aa) /* 0.382683432 */,
Gruenfrosch 0:7627c79db971 419 MAD_F(0x04cfb0e2) /* 0.300705800 */, MAD_F(0x03768962) /* 0.216439614 */,
Gruenfrosch 0:7627c79db971 420 MAD_F(0x0216a2a2) /* 0.130526192 */, MAD_F(0x00b2aa3e) /* 0.043619387 */,
Gruenfrosch 0:7627c79db971 421 };
Gruenfrosch 0:7627c79db971 422 # endif /* ASO_IMDCT */
Gruenfrosch 0:7627c79db971 423
Gruenfrosch 0:7627c79db971 424 /*
Gruenfrosch 0:7627c79db971 425 * windowing coefficients for short blocks
Gruenfrosch 0:7627c79db971 426 * derived from section 2.4.3.4.10.3 of ISO/IEC 11172-3
Gruenfrosch 0:7627c79db971 427 *
Gruenfrosch 0:7627c79db971 428 * window_s[i] = sin((PI / 12) * (i + 1/2))
Gruenfrosch 0:7627c79db971 429 */
Gruenfrosch 0:7627c79db971 430 static
Gruenfrosch 0:7627c79db971 431 mad_fixed_t const window_s[12] = {
Gruenfrosch 0:7627c79db971 432 MAD_F(0x0216a2a2) /* 0.130526192 */, MAD_F(0x061f78aa) /* 0.382683432 */,
Gruenfrosch 0:7627c79db971 433 MAD_F(0x09bd7ca0) /* 0.608761429 */, MAD_F(0x0cb19346) /* 0.793353340 */,
Gruenfrosch 0:7627c79db971 434 MAD_F(0x0ec835e8) /* 0.923879533 */, MAD_F(0x0fdcf549) /* 0.991444861 */,
Gruenfrosch 0:7627c79db971 435 MAD_F(0x0fdcf549) /* 0.991444861 */, MAD_F(0x0ec835e8) /* 0.923879533 */,
Gruenfrosch 0:7627c79db971 436 MAD_F(0x0cb19346) /* 0.793353340 */, MAD_F(0x09bd7ca0) /* 0.608761429 */,
Gruenfrosch 0:7627c79db971 437 MAD_F(0x061f78aa) /* 0.382683432 */, MAD_F(0x0216a2a2) /* 0.130526192 */,
Gruenfrosch 0:7627c79db971 438 };
Gruenfrosch 0:7627c79db971 439
Gruenfrosch 0:7627c79db971 440 /*
Gruenfrosch 0:7627c79db971 441 * coefficients for intensity stereo processing
Gruenfrosch 0:7627c79db971 442 * derived from section 2.4.3.4.9.3 of ISO/IEC 11172-3
Gruenfrosch 0:7627c79db971 443 *
Gruenfrosch 0:7627c79db971 444 * is_ratio[i] = tan(i * (PI / 12))
Gruenfrosch 0:7627c79db971 445 * is_table[i] = is_ratio[i] / (1 + is_ratio[i])
Gruenfrosch 0:7627c79db971 446 */
Gruenfrosch 0:7627c79db971 447 static
Gruenfrosch 0:7627c79db971 448 mad_fixed_t const is_table[7] = {
Gruenfrosch 0:7627c79db971 449 MAD_F(0x00000000) /* 0.000000000 */,
Gruenfrosch 0:7627c79db971 450 MAD_F(0x0361962f) /* 0.211324865 */,
Gruenfrosch 0:7627c79db971 451 MAD_F(0x05db3d74) /* 0.366025404 */,
Gruenfrosch 0:7627c79db971 452 MAD_F(0x08000000) /* 0.500000000 */,
Gruenfrosch 0:7627c79db971 453 MAD_F(0x0a24c28c) /* 0.633974596 */,
Gruenfrosch 0:7627c79db971 454 MAD_F(0x0c9e69d1) /* 0.788675135 */,
Gruenfrosch 0:7627c79db971 455 MAD_F(0x10000000) /* 1.000000000 */
Gruenfrosch 0:7627c79db971 456 };
Gruenfrosch 0:7627c79db971 457
Gruenfrosch 0:7627c79db971 458 /*
Gruenfrosch 0:7627c79db971 459 * coefficients for LSF intensity stereo processing
Gruenfrosch 0:7627c79db971 460 * derived from section 2.4.3.2 of ISO/IEC 13818-3
Gruenfrosch 0:7627c79db971 461 *
Gruenfrosch 0:7627c79db971 462 * is_lsf_table[0][i] = (1 / sqrt(sqrt(2)))^(i + 1)
Gruenfrosch 0:7627c79db971 463 * is_lsf_table[1][i] = (1 / sqrt(2)) ^(i + 1)
Gruenfrosch 0:7627c79db971 464 */
Gruenfrosch 0:7627c79db971 465 static
Gruenfrosch 0:7627c79db971 466 mad_fixed_t const is_lsf_table[2][15] = {
Gruenfrosch 0:7627c79db971 467 {
Gruenfrosch 0:7627c79db971 468 MAD_F(0x0d744fcd) /* 0.840896415 */,
Gruenfrosch 0:7627c79db971 469 MAD_F(0x0b504f33) /* 0.707106781 */,
Gruenfrosch 0:7627c79db971 470 MAD_F(0x09837f05) /* 0.594603558 */,
Gruenfrosch 0:7627c79db971 471 MAD_F(0x08000000) /* 0.500000000 */,
Gruenfrosch 0:7627c79db971 472 MAD_F(0x06ba27e6) /* 0.420448208 */,
Gruenfrosch 0:7627c79db971 473 MAD_F(0x05a8279a) /* 0.353553391 */,
Gruenfrosch 0:7627c79db971 474 MAD_F(0x04c1bf83) /* 0.297301779 */,
Gruenfrosch 0:7627c79db971 475 MAD_F(0x04000000) /* 0.250000000 */,
Gruenfrosch 0:7627c79db971 476 MAD_F(0x035d13f3) /* 0.210224104 */,
Gruenfrosch 0:7627c79db971 477 MAD_F(0x02d413cd) /* 0.176776695 */,
Gruenfrosch 0:7627c79db971 478 MAD_F(0x0260dfc1) /* 0.148650889 */,
Gruenfrosch 0:7627c79db971 479 MAD_F(0x02000000) /* 0.125000000 */,
Gruenfrosch 0:7627c79db971 480 MAD_F(0x01ae89fa) /* 0.105112052 */,
Gruenfrosch 0:7627c79db971 481 MAD_F(0x016a09e6) /* 0.088388348 */,
Gruenfrosch 0:7627c79db971 482 MAD_F(0x01306fe1) /* 0.074325445 */
Gruenfrosch 0:7627c79db971 483 }, {
Gruenfrosch 0:7627c79db971 484 MAD_F(0x0b504f33) /* 0.707106781 */,
Gruenfrosch 0:7627c79db971 485 MAD_F(0x08000000) /* 0.500000000 */,
Gruenfrosch 0:7627c79db971 486 MAD_F(0x05a8279a) /* 0.353553391 */,
Gruenfrosch 0:7627c79db971 487 MAD_F(0x04000000) /* 0.250000000 */,
Gruenfrosch 0:7627c79db971 488 MAD_F(0x02d413cd) /* 0.176776695 */,
Gruenfrosch 0:7627c79db971 489 MAD_F(0x02000000) /* 0.125000000 */,
Gruenfrosch 0:7627c79db971 490 MAD_F(0x016a09e6) /* 0.088388348 */,
Gruenfrosch 0:7627c79db971 491 MAD_F(0x01000000) /* 0.062500000 */,
Gruenfrosch 0:7627c79db971 492 MAD_F(0x00b504f3) /* 0.044194174 */,
Gruenfrosch 0:7627c79db971 493 MAD_F(0x00800000) /* 0.031250000 */,
Gruenfrosch 0:7627c79db971 494 MAD_F(0x005a827a) /* 0.022097087 */,
Gruenfrosch 0:7627c79db971 495 MAD_F(0x00400000) /* 0.015625000 */,
Gruenfrosch 0:7627c79db971 496 MAD_F(0x002d413d) /* 0.011048543 */,
Gruenfrosch 0:7627c79db971 497 MAD_F(0x00200000) /* 0.007812500 */,
Gruenfrosch 0:7627c79db971 498 MAD_F(0x0016a09e) /* 0.005524272 */
Gruenfrosch 0:7627c79db971 499 }
Gruenfrosch 0:7627c79db971 500 };
Gruenfrosch 0:7627c79db971 501
Gruenfrosch 0:7627c79db971 502 /*
Gruenfrosch 0:7627c79db971 503 * NAME: III_sideinfo()
Gruenfrosch 0:7627c79db971 504 * DESCRIPTION: decode frame side information from a bitstream
Gruenfrosch 0:7627c79db971 505 */
Gruenfrosch 0:7627c79db971 506 static
Gruenfrosch 0:7627c79db971 507 enum mad_error III_sideinfo(struct mad_bitptr *ptr, unsigned int nch,
Gruenfrosch 0:7627c79db971 508 int lsf, struct sideinfo *si,
Gruenfrosch 0:7627c79db971 509 unsigned int *data_bitlen,
Gruenfrosch 0:7627c79db971 510 unsigned int *priv_bitlen)
Gruenfrosch 0:7627c79db971 511 {
Gruenfrosch 0:7627c79db971 512 unsigned int ngr, gr, ch, i;
Gruenfrosch 0:7627c79db971 513 enum mad_error result = MAD_ERROR_NONE;
Gruenfrosch 0:7627c79db971 514
Gruenfrosch 0:7627c79db971 515 *data_bitlen = 0;
Gruenfrosch 0:7627c79db971 516 *priv_bitlen = lsf ? ((nch == 1) ? 1 : 2) : ((nch == 1) ? 5 : 3);
Gruenfrosch 0:7627c79db971 517
Gruenfrosch 0:7627c79db971 518 si->main_data_begin = mad_bit_read(ptr, lsf ? 8 : 9);
Gruenfrosch 0:7627c79db971 519 si->private_bits = mad_bit_read(ptr, *priv_bitlen);
Gruenfrosch 0:7627c79db971 520
Gruenfrosch 0:7627c79db971 521 ngr = 1;
Gruenfrosch 0:7627c79db971 522 if (!lsf) {
Gruenfrosch 0:7627c79db971 523 ngr = 2;
Gruenfrosch 0:7627c79db971 524
Gruenfrosch 0:7627c79db971 525 for (ch = 0; ch < nch; ++ch)
Gruenfrosch 0:7627c79db971 526 si->scfsi[ch] = mad_bit_read(ptr, 4);
Gruenfrosch 0:7627c79db971 527 }
Gruenfrosch 0:7627c79db971 528
Gruenfrosch 0:7627c79db971 529 for (gr = 0; gr < ngr; ++gr) {
Gruenfrosch 0:7627c79db971 530 struct granule *granule = &si->gr[gr];
Gruenfrosch 0:7627c79db971 531
Gruenfrosch 0:7627c79db971 532 for (ch = 0; ch < nch; ++ch) {
Gruenfrosch 0:7627c79db971 533 struct channel *channel = &granule->ch[ch];
Gruenfrosch 0:7627c79db971 534
Gruenfrosch 0:7627c79db971 535 channel->part2_3_length = mad_bit_read(ptr, 12);
Gruenfrosch 0:7627c79db971 536 channel->big_values = mad_bit_read(ptr, 9);
Gruenfrosch 0:7627c79db971 537 channel->global_gain = mad_bit_read(ptr, 8);
Gruenfrosch 0:7627c79db971 538 channel->scalefac_compress = mad_bit_read(ptr, lsf ? 9 : 4);
Gruenfrosch 0:7627c79db971 539
Gruenfrosch 0:7627c79db971 540 *data_bitlen += channel->part2_3_length;
Gruenfrosch 0:7627c79db971 541
Gruenfrosch 0:7627c79db971 542 if (channel->big_values > 288 && result == 0)
Gruenfrosch 0:7627c79db971 543 result = MAD_ERROR_BADBIGVALUES;
Gruenfrosch 0:7627c79db971 544
Gruenfrosch 0:7627c79db971 545 channel->flags = 0;
Gruenfrosch 0:7627c79db971 546
Gruenfrosch 0:7627c79db971 547 /* window_switching_flag */
Gruenfrosch 0:7627c79db971 548 if (mad_bit_read(ptr, 1)) {
Gruenfrosch 0:7627c79db971 549 channel->block_type = mad_bit_read(ptr, 2);
Gruenfrosch 0:7627c79db971 550
Gruenfrosch 0:7627c79db971 551 if (channel->block_type == 0 && result == 0)
Gruenfrosch 0:7627c79db971 552 result = MAD_ERROR_BADBLOCKTYPE;
Gruenfrosch 0:7627c79db971 553
Gruenfrosch 0:7627c79db971 554 if (!lsf && channel->block_type == 2 && si->scfsi[ch] && result == 0)
Gruenfrosch 0:7627c79db971 555 result = MAD_ERROR_BADSCFSI;
Gruenfrosch 0:7627c79db971 556
Gruenfrosch 0:7627c79db971 557 channel->region0_count = 7;
Gruenfrosch 0:7627c79db971 558 channel->region1_count = 36;
Gruenfrosch 0:7627c79db971 559
Gruenfrosch 0:7627c79db971 560 if (mad_bit_read(ptr, 1))
Gruenfrosch 0:7627c79db971 561 channel->flags |= mixed_block_flag;
Gruenfrosch 0:7627c79db971 562 else if (channel->block_type == 2)
Gruenfrosch 0:7627c79db971 563 channel->region0_count = 8;
Gruenfrosch 0:7627c79db971 564
Gruenfrosch 0:7627c79db971 565 for (i = 0; i < 2; ++i)
Gruenfrosch 0:7627c79db971 566 channel->table_select[i] = mad_bit_read(ptr, 5);
Gruenfrosch 0:7627c79db971 567
Gruenfrosch 0:7627c79db971 568 # if defined(DEBUG)
Gruenfrosch 0:7627c79db971 569 channel->table_select[2] = 4; /* not used */
Gruenfrosch 0:7627c79db971 570 # endif
Gruenfrosch 0:7627c79db971 571
Gruenfrosch 0:7627c79db971 572 for (i = 0; i < 3; ++i)
Gruenfrosch 0:7627c79db971 573 channel->subblock_gain[i] = mad_bit_read(ptr, 3);
Gruenfrosch 0:7627c79db971 574 }
Gruenfrosch 0:7627c79db971 575 else {
Gruenfrosch 0:7627c79db971 576 channel->block_type = 0;
Gruenfrosch 0:7627c79db971 577
Gruenfrosch 0:7627c79db971 578 for (i = 0; i < 3; ++i)
Gruenfrosch 0:7627c79db971 579 channel->table_select[i] = mad_bit_read(ptr, 5);
Gruenfrosch 0:7627c79db971 580
Gruenfrosch 0:7627c79db971 581 channel->region0_count = mad_bit_read(ptr, 4);
Gruenfrosch 0:7627c79db971 582 channel->region1_count = mad_bit_read(ptr, 3);
Gruenfrosch 0:7627c79db971 583 }
Gruenfrosch 0:7627c79db971 584
Gruenfrosch 0:7627c79db971 585 /* [preflag,] scalefac_scale, count1table_select */
Gruenfrosch 0:7627c79db971 586 channel->flags |= mad_bit_read(ptr, lsf ? 2 : 3);
Gruenfrosch 0:7627c79db971 587 }
Gruenfrosch 0:7627c79db971 588 }
Gruenfrosch 0:7627c79db971 589
Gruenfrosch 0:7627c79db971 590 return result;
Gruenfrosch 0:7627c79db971 591 }
Gruenfrosch 0:7627c79db971 592
Gruenfrosch 0:7627c79db971 593 /*
Gruenfrosch 0:7627c79db971 594 * NAME: III_scalefactors_lsf()
Gruenfrosch 0:7627c79db971 595 * DESCRIPTION: decode channel scalefactors for LSF from a bitstream
Gruenfrosch 0:7627c79db971 596 */
Gruenfrosch 0:7627c79db971 597 static
Gruenfrosch 0:7627c79db971 598 unsigned int III_scalefactors_lsf(struct mad_bitptr *ptr,
Gruenfrosch 0:7627c79db971 599 struct channel *channel,
Gruenfrosch 0:7627c79db971 600 struct channel *gr1ch, int mode_extension)
Gruenfrosch 0:7627c79db971 601 {
Gruenfrosch 0:7627c79db971 602 struct mad_bitptr start;
Gruenfrosch 0:7627c79db971 603 unsigned int scalefac_compress, index, slen[4], part, n, i;
Gruenfrosch 0:7627c79db971 604 unsigned char const *nsfb;
Gruenfrosch 0:7627c79db971 605
Gruenfrosch 0:7627c79db971 606 start = *ptr;
Gruenfrosch 0:7627c79db971 607
Gruenfrosch 0:7627c79db971 608 scalefac_compress = channel->scalefac_compress;
Gruenfrosch 0:7627c79db971 609 index = (channel->block_type == 2) ?
Gruenfrosch 0:7627c79db971 610 ((channel->flags & mixed_block_flag) ? 2 : 1) : 0;
Gruenfrosch 0:7627c79db971 611
Gruenfrosch 0:7627c79db971 612 if (!((mode_extension & I_STEREO) && gr1ch)) {
Gruenfrosch 0:7627c79db971 613 if (scalefac_compress < 400) {
Gruenfrosch 0:7627c79db971 614 slen[0] = (scalefac_compress >> 4) / 5;
Gruenfrosch 0:7627c79db971 615 slen[1] = (scalefac_compress >> 4) % 5;
Gruenfrosch 0:7627c79db971 616 slen[2] = (scalefac_compress % 16) >> 2;
Gruenfrosch 0:7627c79db971 617 slen[3] = scalefac_compress % 4;
Gruenfrosch 0:7627c79db971 618
Gruenfrosch 0:7627c79db971 619 nsfb = nsfb_table[0][index];
Gruenfrosch 0:7627c79db971 620 }
Gruenfrosch 0:7627c79db971 621 else if (scalefac_compress < 500) {
Gruenfrosch 0:7627c79db971 622 scalefac_compress -= 400;
Gruenfrosch 0:7627c79db971 623
Gruenfrosch 0:7627c79db971 624 slen[0] = (scalefac_compress >> 2) / 5;
Gruenfrosch 0:7627c79db971 625 slen[1] = (scalefac_compress >> 2) % 5;
Gruenfrosch 0:7627c79db971 626 slen[2] = scalefac_compress % 4;
Gruenfrosch 0:7627c79db971 627 slen[3] = 0;
Gruenfrosch 0:7627c79db971 628
Gruenfrosch 0:7627c79db971 629 nsfb = nsfb_table[1][index];
Gruenfrosch 0:7627c79db971 630 }
Gruenfrosch 0:7627c79db971 631 else {
Gruenfrosch 0:7627c79db971 632 scalefac_compress -= 500;
Gruenfrosch 0:7627c79db971 633
Gruenfrosch 0:7627c79db971 634 slen[0] = scalefac_compress / 3;
Gruenfrosch 0:7627c79db971 635 slen[1] = scalefac_compress % 3;
Gruenfrosch 0:7627c79db971 636 slen[2] = 0;
Gruenfrosch 0:7627c79db971 637 slen[3] = 0;
Gruenfrosch 0:7627c79db971 638
Gruenfrosch 0:7627c79db971 639 channel->flags |= preflag;
Gruenfrosch 0:7627c79db971 640
Gruenfrosch 0:7627c79db971 641 nsfb = nsfb_table[2][index];
Gruenfrosch 0:7627c79db971 642 }
Gruenfrosch 0:7627c79db971 643
Gruenfrosch 0:7627c79db971 644 n = 0;
Gruenfrosch 0:7627c79db971 645 for (part = 0; part < 4; ++part) {
Gruenfrosch 0:7627c79db971 646 for (i = 0; i < nsfb[part]; ++i)
Gruenfrosch 0:7627c79db971 647 channel->scalefac[n++] = mad_bit_read(ptr, slen[part]);
Gruenfrosch 0:7627c79db971 648 }
Gruenfrosch 0:7627c79db971 649
Gruenfrosch 0:7627c79db971 650 while (n < 39)
Gruenfrosch 0:7627c79db971 651 channel->scalefac[n++] = 0;
Gruenfrosch 0:7627c79db971 652 }
Gruenfrosch 0:7627c79db971 653 else { /* (mode_extension & I_STEREO) && gr1ch (i.e. ch == 1) */
Gruenfrosch 0:7627c79db971 654 scalefac_compress >>= 1;
Gruenfrosch 0:7627c79db971 655
Gruenfrosch 0:7627c79db971 656 if (scalefac_compress < 180) {
Gruenfrosch 0:7627c79db971 657 slen[0] = scalefac_compress / 36;
Gruenfrosch 0:7627c79db971 658 slen[1] = (scalefac_compress % 36) / 6;
Gruenfrosch 0:7627c79db971 659 slen[2] = (scalefac_compress % 36) % 6;
Gruenfrosch 0:7627c79db971 660 slen[3] = 0;
Gruenfrosch 0:7627c79db971 661
Gruenfrosch 0:7627c79db971 662 nsfb = nsfb_table[3][index];
Gruenfrosch 0:7627c79db971 663 }
Gruenfrosch 0:7627c79db971 664 else if (scalefac_compress < 244) {
Gruenfrosch 0:7627c79db971 665 scalefac_compress -= 180;
Gruenfrosch 0:7627c79db971 666
Gruenfrosch 0:7627c79db971 667 slen[0] = (scalefac_compress % 64) >> 4;
Gruenfrosch 0:7627c79db971 668 slen[1] = (scalefac_compress % 16) >> 2;
Gruenfrosch 0:7627c79db971 669 slen[2] = scalefac_compress % 4;
Gruenfrosch 0:7627c79db971 670 slen[3] = 0;
Gruenfrosch 0:7627c79db971 671
Gruenfrosch 0:7627c79db971 672 nsfb = nsfb_table[4][index];
Gruenfrosch 0:7627c79db971 673 }
Gruenfrosch 0:7627c79db971 674 else {
Gruenfrosch 0:7627c79db971 675 scalefac_compress -= 244;
Gruenfrosch 0:7627c79db971 676
Gruenfrosch 0:7627c79db971 677 slen[0] = scalefac_compress / 3;
Gruenfrosch 0:7627c79db971 678 slen[1] = scalefac_compress % 3;
Gruenfrosch 0:7627c79db971 679 slen[2] = 0;
Gruenfrosch 0:7627c79db971 680 slen[3] = 0;
Gruenfrosch 0:7627c79db971 681
Gruenfrosch 0:7627c79db971 682 nsfb = nsfb_table[5][index];
Gruenfrosch 0:7627c79db971 683 }
Gruenfrosch 0:7627c79db971 684
Gruenfrosch 0:7627c79db971 685 n = 0;
Gruenfrosch 0:7627c79db971 686 for (part = 0; part < 4; ++part) {
Gruenfrosch 0:7627c79db971 687 unsigned int max, is_pos;
Gruenfrosch 0:7627c79db971 688
Gruenfrosch 0:7627c79db971 689 max = (1 << slen[part]) - 1;
Gruenfrosch 0:7627c79db971 690
Gruenfrosch 0:7627c79db971 691 for (i = 0; i < nsfb[part]; ++i) {
Gruenfrosch 0:7627c79db971 692 is_pos = mad_bit_read(ptr, slen[part]);
Gruenfrosch 0:7627c79db971 693
Gruenfrosch 0:7627c79db971 694 channel->scalefac[n] = is_pos;
Gruenfrosch 0:7627c79db971 695 gr1ch->scalefac[n++] = (is_pos == max);
Gruenfrosch 0:7627c79db971 696 }
Gruenfrosch 0:7627c79db971 697 }
Gruenfrosch 0:7627c79db971 698
Gruenfrosch 0:7627c79db971 699 while (n < 39) {
Gruenfrosch 0:7627c79db971 700 channel->scalefac[n] = 0;
Gruenfrosch 0:7627c79db971 701 gr1ch->scalefac[n++] = 0; /* apparently not illegal */
Gruenfrosch 0:7627c79db971 702 }
Gruenfrosch 0:7627c79db971 703 }
Gruenfrosch 0:7627c79db971 704
Gruenfrosch 0:7627c79db971 705 return mad_bit_length(&start, ptr);
Gruenfrosch 0:7627c79db971 706 }
Gruenfrosch 0:7627c79db971 707
Gruenfrosch 0:7627c79db971 708 /*
Gruenfrosch 0:7627c79db971 709 * NAME: III_scalefactors()
Gruenfrosch 0:7627c79db971 710 * DESCRIPTION: decode channel scalefactors of one granule from a bitstream
Gruenfrosch 0:7627c79db971 711 */
Gruenfrosch 0:7627c79db971 712 static
Gruenfrosch 0:7627c79db971 713 unsigned int III_scalefactors(struct mad_bitptr *ptr, struct channel *channel,
Gruenfrosch 0:7627c79db971 714 struct channel const *gr0ch, unsigned int scfsi)
Gruenfrosch 0:7627c79db971 715 {
Gruenfrosch 0:7627c79db971 716 struct mad_bitptr start;
Gruenfrosch 0:7627c79db971 717 unsigned int slen1, slen2, sfbi;
Gruenfrosch 0:7627c79db971 718
Gruenfrosch 0:7627c79db971 719 start = *ptr;
Gruenfrosch 0:7627c79db971 720
Gruenfrosch 0:7627c79db971 721 slen1 = sflen_table[channel->scalefac_compress].slen1;
Gruenfrosch 0:7627c79db971 722 slen2 = sflen_table[channel->scalefac_compress].slen2;
Gruenfrosch 0:7627c79db971 723
Gruenfrosch 0:7627c79db971 724 if (channel->block_type == 2) {
Gruenfrosch 0:7627c79db971 725 unsigned int nsfb;
Gruenfrosch 0:7627c79db971 726
Gruenfrosch 0:7627c79db971 727 sfbi = 0;
Gruenfrosch 0:7627c79db971 728
Gruenfrosch 0:7627c79db971 729 nsfb = (channel->flags & mixed_block_flag) ? 8 + 3 * 3 : 6 * 3;
Gruenfrosch 0:7627c79db971 730 while (nsfb--)
Gruenfrosch 0:7627c79db971 731 channel->scalefac[sfbi++] = mad_bit_read(ptr, slen1);
Gruenfrosch 0:7627c79db971 732
Gruenfrosch 0:7627c79db971 733 nsfb = 6 * 3;
Gruenfrosch 0:7627c79db971 734 while (nsfb--)
Gruenfrosch 0:7627c79db971 735 channel->scalefac[sfbi++] = mad_bit_read(ptr, slen2);
Gruenfrosch 0:7627c79db971 736
Gruenfrosch 0:7627c79db971 737 nsfb = 1 * 3;
Gruenfrosch 0:7627c79db971 738 while (nsfb--)
Gruenfrosch 0:7627c79db971 739 channel->scalefac[sfbi++] = 0;
Gruenfrosch 0:7627c79db971 740 }
Gruenfrosch 0:7627c79db971 741 else { /* channel->block_type != 2 */
Gruenfrosch 0:7627c79db971 742 if (scfsi & 0x8) {
Gruenfrosch 0:7627c79db971 743 for (sfbi = 0; sfbi < 6; ++sfbi)
Gruenfrosch 0:7627c79db971 744 channel->scalefac[sfbi] = gr0ch->scalefac[sfbi];
Gruenfrosch 0:7627c79db971 745 }
Gruenfrosch 0:7627c79db971 746 else {
Gruenfrosch 0:7627c79db971 747 for (sfbi = 0; sfbi < 6; ++sfbi)
Gruenfrosch 0:7627c79db971 748 channel->scalefac[sfbi] = mad_bit_read(ptr, slen1);
Gruenfrosch 0:7627c79db971 749 }
Gruenfrosch 0:7627c79db971 750
Gruenfrosch 0:7627c79db971 751 if (scfsi & 0x4) {
Gruenfrosch 0:7627c79db971 752 for (sfbi = 6; sfbi < 11; ++sfbi)
Gruenfrosch 0:7627c79db971 753 channel->scalefac[sfbi] = gr0ch->scalefac[sfbi];
Gruenfrosch 0:7627c79db971 754 }
Gruenfrosch 0:7627c79db971 755 else {
Gruenfrosch 0:7627c79db971 756 for (sfbi = 6; sfbi < 11; ++sfbi)
Gruenfrosch 0:7627c79db971 757 channel->scalefac[sfbi] = mad_bit_read(ptr, slen1);
Gruenfrosch 0:7627c79db971 758 }
Gruenfrosch 0:7627c79db971 759
Gruenfrosch 0:7627c79db971 760 if (scfsi & 0x2) {
Gruenfrosch 0:7627c79db971 761 for (sfbi = 11; sfbi < 16; ++sfbi)
Gruenfrosch 0:7627c79db971 762 channel->scalefac[sfbi] = gr0ch->scalefac[sfbi];
Gruenfrosch 0:7627c79db971 763 }
Gruenfrosch 0:7627c79db971 764 else {
Gruenfrosch 0:7627c79db971 765 for (sfbi = 11; sfbi < 16; ++sfbi)
Gruenfrosch 0:7627c79db971 766 channel->scalefac[sfbi] = mad_bit_read(ptr, slen2);
Gruenfrosch 0:7627c79db971 767 }
Gruenfrosch 0:7627c79db971 768
Gruenfrosch 0:7627c79db971 769 if (scfsi & 0x1) {
Gruenfrosch 0:7627c79db971 770 for (sfbi = 16; sfbi < 21; ++sfbi)
Gruenfrosch 0:7627c79db971 771 channel->scalefac[sfbi] = gr0ch->scalefac[sfbi];
Gruenfrosch 0:7627c79db971 772 }
Gruenfrosch 0:7627c79db971 773 else {
Gruenfrosch 0:7627c79db971 774 for (sfbi = 16; sfbi < 21; ++sfbi)
Gruenfrosch 0:7627c79db971 775 channel->scalefac[sfbi] = mad_bit_read(ptr, slen2);
Gruenfrosch 0:7627c79db971 776 }
Gruenfrosch 0:7627c79db971 777
Gruenfrosch 0:7627c79db971 778 channel->scalefac[21] = 0;
Gruenfrosch 0:7627c79db971 779 }
Gruenfrosch 0:7627c79db971 780
Gruenfrosch 0:7627c79db971 781 return mad_bit_length(&start, ptr);
Gruenfrosch 0:7627c79db971 782 }
Gruenfrosch 0:7627c79db971 783
Gruenfrosch 0:7627c79db971 784 /*
Gruenfrosch 0:7627c79db971 785 * The Layer III formula for requantization and scaling is defined by
Gruenfrosch 0:7627c79db971 786 * section 2.4.3.4.7.1 of ISO/IEC 11172-3, as follows:
Gruenfrosch 0:7627c79db971 787 *
Gruenfrosch 0:7627c79db971 788 * long blocks:
Gruenfrosch 0:7627c79db971 789 * xr[i] = sign(is[i]) * abs(is[i])^(4/3) *
Gruenfrosch 0:7627c79db971 790 * 2^((1/4) * (global_gain - 210)) *
Gruenfrosch 0:7627c79db971 791 * 2^-(scalefac_multiplier *
Gruenfrosch 0:7627c79db971 792 * (scalefac_l[sfb] + preflag * pretab[sfb]))
Gruenfrosch 0:7627c79db971 793 *
Gruenfrosch 0:7627c79db971 794 * short blocks:
Gruenfrosch 0:7627c79db971 795 * xr[i] = sign(is[i]) * abs(is[i])^(4/3) *
Gruenfrosch 0:7627c79db971 796 * 2^((1/4) * (global_gain - 210 - 8 * subblock_gain[w])) *
Gruenfrosch 0:7627c79db971 797 * 2^-(scalefac_multiplier * scalefac_s[sfb][w])
Gruenfrosch 0:7627c79db971 798 *
Gruenfrosch 0:7627c79db971 799 * where:
Gruenfrosch 0:7627c79db971 800 * scalefac_multiplier = (scalefac_scale + 1) / 2
Gruenfrosch 0:7627c79db971 801 *
Gruenfrosch 0:7627c79db971 802 * The routines III_exponents() and III_requantize() facilitate this
Gruenfrosch 0:7627c79db971 803 * calculation.
Gruenfrosch 0:7627c79db971 804 */
Gruenfrosch 0:7627c79db971 805
Gruenfrosch 0:7627c79db971 806 /*
Gruenfrosch 0:7627c79db971 807 * NAME: III_exponents()
Gruenfrosch 0:7627c79db971 808 * DESCRIPTION: calculate scalefactor exponents
Gruenfrosch 0:7627c79db971 809 */
Gruenfrosch 0:7627c79db971 810 static
Gruenfrosch 0:7627c79db971 811 void III_exponents(struct channel const *channel,
Gruenfrosch 0:7627c79db971 812 unsigned char const *sfbwidth, signed int exponents[39])
Gruenfrosch 0:7627c79db971 813 {
Gruenfrosch 0:7627c79db971 814 signed int gain;
Gruenfrosch 0:7627c79db971 815 unsigned int scalefac_multiplier, sfbi;
Gruenfrosch 0:7627c79db971 816
Gruenfrosch 0:7627c79db971 817 gain = (signed int) channel->global_gain - 210;
Gruenfrosch 0:7627c79db971 818 scalefac_multiplier = (channel->flags & scalefac_scale) ? 2 : 1;
Gruenfrosch 0:7627c79db971 819
Gruenfrosch 0:7627c79db971 820 if (channel->block_type == 2) {
Gruenfrosch 0:7627c79db971 821 unsigned int l;
Gruenfrosch 0:7627c79db971 822 signed int gain0, gain1, gain2;
Gruenfrosch 0:7627c79db971 823
Gruenfrosch 0:7627c79db971 824 sfbi = l = 0;
Gruenfrosch 0:7627c79db971 825
Gruenfrosch 0:7627c79db971 826 if (channel->flags & mixed_block_flag) {
Gruenfrosch 0:7627c79db971 827 unsigned int premask;
Gruenfrosch 0:7627c79db971 828
Gruenfrosch 0:7627c79db971 829 premask = (channel->flags & preflag) ? ~0 : 0;
Gruenfrosch 0:7627c79db971 830
Gruenfrosch 0:7627c79db971 831 /* long block subbands 0-1 */
Gruenfrosch 0:7627c79db971 832
Gruenfrosch 0:7627c79db971 833 while (l < 36) {
Gruenfrosch 0:7627c79db971 834 exponents[sfbi] = gain -
Gruenfrosch 0:7627c79db971 835 (signed int) ((channel->scalefac[sfbi] + (pretab[sfbi] & premask)) <<
Gruenfrosch 0:7627c79db971 836 scalefac_multiplier);
Gruenfrosch 0:7627c79db971 837
Gruenfrosch 0:7627c79db971 838 l += sfbwidth[sfbi++];
Gruenfrosch 0:7627c79db971 839 }
Gruenfrosch 0:7627c79db971 840 }
Gruenfrosch 0:7627c79db971 841
Gruenfrosch 0:7627c79db971 842 /* this is probably wrong for 8000 Hz short/mixed blocks */
Gruenfrosch 0:7627c79db971 843
Gruenfrosch 0:7627c79db971 844 gain0 = gain - 8 * (signed int) channel->subblock_gain[0];
Gruenfrosch 0:7627c79db971 845 gain1 = gain - 8 * (signed int) channel->subblock_gain[1];
Gruenfrosch 0:7627c79db971 846 gain2 = gain - 8 * (signed int) channel->subblock_gain[2];
Gruenfrosch 0:7627c79db971 847
Gruenfrosch 0:7627c79db971 848 while (l < 576) {
Gruenfrosch 0:7627c79db971 849 exponents[sfbi + 0] = gain0 -
Gruenfrosch 0:7627c79db971 850 (signed int) (channel->scalefac[sfbi + 0] << scalefac_multiplier);
Gruenfrosch 0:7627c79db971 851 exponents[sfbi + 1] = gain1 -
Gruenfrosch 0:7627c79db971 852 (signed int) (channel->scalefac[sfbi + 1] << scalefac_multiplier);
Gruenfrosch 0:7627c79db971 853 exponents[sfbi + 2] = gain2 -
Gruenfrosch 0:7627c79db971 854 (signed int) (channel->scalefac[sfbi + 2] << scalefac_multiplier);
Gruenfrosch 0:7627c79db971 855
Gruenfrosch 0:7627c79db971 856 l += 3 * sfbwidth[sfbi];
Gruenfrosch 0:7627c79db971 857 sfbi += 3;
Gruenfrosch 0:7627c79db971 858 }
Gruenfrosch 0:7627c79db971 859 }
Gruenfrosch 0:7627c79db971 860 else { /* channel->block_type != 2 */
Gruenfrosch 0:7627c79db971 861 if (channel->flags & preflag) {
Gruenfrosch 0:7627c79db971 862 for (sfbi = 0; sfbi < 22; ++sfbi) {
Gruenfrosch 0:7627c79db971 863 exponents[sfbi] = gain -
Gruenfrosch 0:7627c79db971 864 (signed int) ((channel->scalefac[sfbi] + pretab[sfbi]) <<
Gruenfrosch 0:7627c79db971 865 scalefac_multiplier);
Gruenfrosch 0:7627c79db971 866 }
Gruenfrosch 0:7627c79db971 867 }
Gruenfrosch 0:7627c79db971 868 else {
Gruenfrosch 0:7627c79db971 869 for (sfbi = 0; sfbi < 22; ++sfbi) {
Gruenfrosch 0:7627c79db971 870 exponents[sfbi] = gain -
Gruenfrosch 0:7627c79db971 871 (signed int) (channel->scalefac[sfbi] << scalefac_multiplier);
Gruenfrosch 0:7627c79db971 872 }
Gruenfrosch 0:7627c79db971 873 }
Gruenfrosch 0:7627c79db971 874 }
Gruenfrosch 0:7627c79db971 875 }
Gruenfrosch 0:7627c79db971 876
Gruenfrosch 0:7627c79db971 877 /*
Gruenfrosch 0:7627c79db971 878 * NAME: III_requantize()
Gruenfrosch 0:7627c79db971 879 * DESCRIPTION: requantize one (positive) value
Gruenfrosch 0:7627c79db971 880 */
Gruenfrosch 0:7627c79db971 881 static
Gruenfrosch 0:7627c79db971 882 mad_fixed_t III_requantize(unsigned int value, signed int exp)
Gruenfrosch 0:7627c79db971 883 {
Gruenfrosch 0:7627c79db971 884 mad_fixed_t requantized;
Gruenfrosch 0:7627c79db971 885 signed int frac;
Gruenfrosch 0:7627c79db971 886 struct fixedfloat const *power;
Gruenfrosch 0:7627c79db971 887
Gruenfrosch 0:7627c79db971 888 frac = exp % 4; /* assumes sign(frac) == sign(exp) */
Gruenfrosch 0:7627c79db971 889 exp /= 4;
Gruenfrosch 0:7627c79db971 890
Gruenfrosch 0:7627c79db971 891 power = &rq_table[value];
Gruenfrosch 0:7627c79db971 892 requantized = power->mantissa;
Gruenfrosch 0:7627c79db971 893 exp += power->exponent;
Gruenfrosch 0:7627c79db971 894
Gruenfrosch 0:7627c79db971 895 if (exp < 0) {
Gruenfrosch 0:7627c79db971 896 if (-exp >= sizeof(mad_fixed_t) * CHAR_BIT) {
Gruenfrosch 0:7627c79db971 897 /* underflow */
Gruenfrosch 0:7627c79db971 898 requantized = 0;
Gruenfrosch 0:7627c79db971 899 }
Gruenfrosch 0:7627c79db971 900 else {
Gruenfrosch 0:7627c79db971 901 requantized += 1L << (-exp - 1);
Gruenfrosch 0:7627c79db971 902 requantized >>= -exp;
Gruenfrosch 0:7627c79db971 903 }
Gruenfrosch 0:7627c79db971 904 }
Gruenfrosch 0:7627c79db971 905 else {
Gruenfrosch 0:7627c79db971 906 if (exp >= 5) {
Gruenfrosch 0:7627c79db971 907 /* overflow */
Gruenfrosch 0:7627c79db971 908 # if defined(DEBUG)
Gruenfrosch 0:7627c79db971 909 fprintf(stderr, "requantize overflow (%f * 2^%d)\n",
Gruenfrosch 0:7627c79db971 910 mad_f_todouble(requantized), exp);
Gruenfrosch 0:7627c79db971 911 # endif
Gruenfrosch 0:7627c79db971 912 requantized = MAD_F_MAX;
Gruenfrosch 0:7627c79db971 913 }
Gruenfrosch 0:7627c79db971 914 else
Gruenfrosch 0:7627c79db971 915 requantized <<= exp;
Gruenfrosch 0:7627c79db971 916 }
Gruenfrosch 0:7627c79db971 917
Gruenfrosch 0:7627c79db971 918 return frac ? mad_f_mul(requantized, root_table[3 + frac]) : requantized;
Gruenfrosch 0:7627c79db971 919 }
Gruenfrosch 0:7627c79db971 920
Gruenfrosch 0:7627c79db971 921 /* we must take care that sz >= bits and sz < sizeof(long) lest bits == 0 */
Gruenfrosch 0:7627c79db971 922 # define MASK(cache, sz, bits) \
Gruenfrosch 0:7627c79db971 923 (((cache) >> ((sz) - (bits))) & ((1 << (bits)) - 1))
Gruenfrosch 0:7627c79db971 924 # define MASK1BIT(cache, sz) \
Gruenfrosch 0:7627c79db971 925 ((cache) & (1 << ((sz) - 1)))
Gruenfrosch 0:7627c79db971 926
Gruenfrosch 0:7627c79db971 927 /*
Gruenfrosch 0:7627c79db971 928 * NAME: III_huffdecode()
Gruenfrosch 0:7627c79db971 929 * DESCRIPTION: decode Huffman code words of one channel of one granule
Gruenfrosch 0:7627c79db971 930 */
Gruenfrosch 0:7627c79db971 931 static
Gruenfrosch 0:7627c79db971 932 enum mad_error III_huffdecode(struct mad_bitptr *ptr, mad_fixed_t xr[576],
Gruenfrosch 0:7627c79db971 933 struct channel *channel,
Gruenfrosch 0:7627c79db971 934 unsigned char const *sfbwidth,
Gruenfrosch 0:7627c79db971 935 unsigned int part2_length)
Gruenfrosch 0:7627c79db971 936 {
Gruenfrosch 0:7627c79db971 937 signed int exponents[39], exp;
Gruenfrosch 0:7627c79db971 938 signed int const *expptr;
Gruenfrosch 0:7627c79db971 939 struct mad_bitptr peek;
Gruenfrosch 0:7627c79db971 940 signed int bits_left, cachesz;
Gruenfrosch 0:7627c79db971 941 register mad_fixed_t *xrptr;
Gruenfrosch 0:7627c79db971 942 mad_fixed_t const *sfbound;
Gruenfrosch 0:7627c79db971 943 register unsigned long bitcache;
Gruenfrosch 0:7627c79db971 944
Gruenfrosch 0:7627c79db971 945 bits_left = (signed) channel->part2_3_length - (signed) part2_length;
Gruenfrosch 0:7627c79db971 946 if (bits_left < 0)
Gruenfrosch 0:7627c79db971 947 return MAD_ERROR_BADPART3LEN;
Gruenfrosch 0:7627c79db971 948
Gruenfrosch 0:7627c79db971 949 III_exponents(channel, sfbwidth, exponents);
Gruenfrosch 0:7627c79db971 950
Gruenfrosch 0:7627c79db971 951 peek = *ptr;
Gruenfrosch 0:7627c79db971 952 mad_bit_skip(ptr, bits_left);
Gruenfrosch 0:7627c79db971 953
Gruenfrosch 0:7627c79db971 954 /* align bit reads to byte boundaries */
Gruenfrosch 0:7627c79db971 955 cachesz = mad_bit_bitsleft(&peek);
Gruenfrosch 0:7627c79db971 956 cachesz += ((32 - 1 - 24) + (24 - cachesz)) & ~7;
Gruenfrosch 0:7627c79db971 957
Gruenfrosch 0:7627c79db971 958 bitcache = mad_bit_read(&peek, cachesz);
Gruenfrosch 0:7627c79db971 959 bits_left -= cachesz;
Gruenfrosch 0:7627c79db971 960
Gruenfrosch 0:7627c79db971 961 xrptr = &xr[0];
Gruenfrosch 0:7627c79db971 962
Gruenfrosch 0:7627c79db971 963 /* big_values */
Gruenfrosch 0:7627c79db971 964 {
Gruenfrosch 0:7627c79db971 965 unsigned int region, rcount;
Gruenfrosch 0:7627c79db971 966 struct hufftable const *entry;
Gruenfrosch 0:7627c79db971 967 union huffpair const *table;
Gruenfrosch 0:7627c79db971 968 unsigned int linbits, startbits, big_values, reqhits;
Gruenfrosch 0:7627c79db971 969 mad_fixed_t reqcache[16];
Gruenfrosch 0:7627c79db971 970
Gruenfrosch 0:7627c79db971 971 sfbound = xrptr + *sfbwidth++;
Gruenfrosch 0:7627c79db971 972 rcount = channel->region0_count + 1;
Gruenfrosch 0:7627c79db971 973
Gruenfrosch 0:7627c79db971 974 entry = &mad_huff_pair_table[channel->table_select[region = 0]];
Gruenfrosch 0:7627c79db971 975 table = entry->table;
Gruenfrosch 0:7627c79db971 976 linbits = entry->linbits;
Gruenfrosch 0:7627c79db971 977 startbits = entry->startbits;
Gruenfrosch 0:7627c79db971 978
Gruenfrosch 0:7627c79db971 979 if (table == 0)
Gruenfrosch 0:7627c79db971 980 return MAD_ERROR_BADHUFFTABLE;
Gruenfrosch 0:7627c79db971 981
Gruenfrosch 0:7627c79db971 982 expptr = &exponents[0];
Gruenfrosch 0:7627c79db971 983 exp = *expptr++;
Gruenfrosch 0:7627c79db971 984 reqhits = 0;
Gruenfrosch 0:7627c79db971 985
Gruenfrosch 0:7627c79db971 986 big_values = channel->big_values;
Gruenfrosch 0:7627c79db971 987
Gruenfrosch 0:7627c79db971 988 while (big_values-- && cachesz + bits_left > 0) {
Gruenfrosch 0:7627c79db971 989 union huffpair const *pair;
Gruenfrosch 0:7627c79db971 990 unsigned int clumpsz, value;
Gruenfrosch 0:7627c79db971 991 register mad_fixed_t requantized;
Gruenfrosch 0:7627c79db971 992
Gruenfrosch 0:7627c79db971 993 if (xrptr == sfbound) {
Gruenfrosch 0:7627c79db971 994 sfbound += *sfbwidth++;
Gruenfrosch 0:7627c79db971 995
Gruenfrosch 0:7627c79db971 996 /* change table if region boundary */
Gruenfrosch 0:7627c79db971 997
Gruenfrosch 0:7627c79db971 998 if (--rcount == 0) {
Gruenfrosch 0:7627c79db971 999 if (region == 0)
Gruenfrosch 0:7627c79db971 1000 rcount = channel->region1_count + 1;
Gruenfrosch 0:7627c79db971 1001 else
Gruenfrosch 0:7627c79db971 1002 rcount = 0; /* all remaining */
Gruenfrosch 0:7627c79db971 1003
Gruenfrosch 0:7627c79db971 1004 entry = &mad_huff_pair_table[channel->table_select[++region]];
Gruenfrosch 0:7627c79db971 1005 table = entry->table;
Gruenfrosch 0:7627c79db971 1006 linbits = entry->linbits;
Gruenfrosch 0:7627c79db971 1007 startbits = entry->startbits;
Gruenfrosch 0:7627c79db971 1008
Gruenfrosch 0:7627c79db971 1009 if (table == 0)
Gruenfrosch 0:7627c79db971 1010 return MAD_ERROR_BADHUFFTABLE;
Gruenfrosch 0:7627c79db971 1011 }
Gruenfrosch 0:7627c79db971 1012
Gruenfrosch 0:7627c79db971 1013 if (exp != *expptr) {
Gruenfrosch 0:7627c79db971 1014 exp = *expptr;
Gruenfrosch 0:7627c79db971 1015 reqhits = 0;
Gruenfrosch 0:7627c79db971 1016 }
Gruenfrosch 0:7627c79db971 1017
Gruenfrosch 0:7627c79db971 1018 ++expptr;
Gruenfrosch 0:7627c79db971 1019 }
Gruenfrosch 0:7627c79db971 1020
Gruenfrosch 0:7627c79db971 1021 if (cachesz < 21) {
Gruenfrosch 0:7627c79db971 1022 unsigned int bits;
Gruenfrosch 0:7627c79db971 1023
Gruenfrosch 0:7627c79db971 1024 bits = ((32 - 1 - 21) + (21 - cachesz)) & ~7;
Gruenfrosch 0:7627c79db971 1025 bitcache = (bitcache << bits) | mad_bit_read(&peek, bits);
Gruenfrosch 0:7627c79db971 1026 cachesz += bits;
Gruenfrosch 0:7627c79db971 1027 bits_left -= bits;
Gruenfrosch 0:7627c79db971 1028 }
Gruenfrosch 0:7627c79db971 1029
Gruenfrosch 0:7627c79db971 1030 /* hcod (0..19) */
Gruenfrosch 0:7627c79db971 1031
Gruenfrosch 0:7627c79db971 1032 clumpsz = startbits;
Gruenfrosch 0:7627c79db971 1033 pair = &table[MASK(bitcache, cachesz, clumpsz)];
Gruenfrosch 0:7627c79db971 1034
Gruenfrosch 0:7627c79db971 1035 while (!pair->final) {
Gruenfrosch 0:7627c79db971 1036 cachesz -= clumpsz;
Gruenfrosch 0:7627c79db971 1037
Gruenfrosch 0:7627c79db971 1038 clumpsz = pair->ptr.bits;
Gruenfrosch 0:7627c79db971 1039 pair = &table[pair->ptr.offset + MASK(bitcache, cachesz, clumpsz)];
Gruenfrosch 0:7627c79db971 1040 }
Gruenfrosch 0:7627c79db971 1041
Gruenfrosch 0:7627c79db971 1042 cachesz -= pair->value.hlen;
Gruenfrosch 0:7627c79db971 1043
Gruenfrosch 0:7627c79db971 1044 if (linbits) {
Gruenfrosch 0:7627c79db971 1045 /* x (0..14) */
Gruenfrosch 0:7627c79db971 1046
Gruenfrosch 0:7627c79db971 1047 value = pair->value.x;
Gruenfrosch 0:7627c79db971 1048
Gruenfrosch 0:7627c79db971 1049 switch (value) {
Gruenfrosch 0:7627c79db971 1050 case 0:
Gruenfrosch 0:7627c79db971 1051 xrptr[0] = 0;
Gruenfrosch 0:7627c79db971 1052 break;
Gruenfrosch 0:7627c79db971 1053
Gruenfrosch 0:7627c79db971 1054 case 15:
Gruenfrosch 0:7627c79db971 1055 if (cachesz < linbits + 2) {
Gruenfrosch 0:7627c79db971 1056 bitcache = (bitcache << 16) | mad_bit_read(&peek, 16);
Gruenfrosch 0:7627c79db971 1057 cachesz += 16;
Gruenfrosch 0:7627c79db971 1058 bits_left -= 16;
Gruenfrosch 0:7627c79db971 1059 }
Gruenfrosch 0:7627c79db971 1060
Gruenfrosch 0:7627c79db971 1061 value += MASK(bitcache, cachesz, linbits);
Gruenfrosch 0:7627c79db971 1062 cachesz -= linbits;
Gruenfrosch 0:7627c79db971 1063
Gruenfrosch 0:7627c79db971 1064 requantized = III_requantize(value, exp);
Gruenfrosch 0:7627c79db971 1065 goto x_final;
Gruenfrosch 0:7627c79db971 1066
Gruenfrosch 0:7627c79db971 1067 default:
Gruenfrosch 0:7627c79db971 1068 if (reqhits & (1 << value))
Gruenfrosch 0:7627c79db971 1069 requantized = reqcache[value];
Gruenfrosch 0:7627c79db971 1070 else {
Gruenfrosch 0:7627c79db971 1071 reqhits |= (1 << value);
Gruenfrosch 0:7627c79db971 1072 requantized = reqcache[value] = III_requantize(value, exp);
Gruenfrosch 0:7627c79db971 1073 }
Gruenfrosch 0:7627c79db971 1074
Gruenfrosch 0:7627c79db971 1075 x_final:
Gruenfrosch 0:7627c79db971 1076 xrptr[0] = MASK1BIT(bitcache, cachesz--) ?
Gruenfrosch 0:7627c79db971 1077 -requantized : requantized;
Gruenfrosch 0:7627c79db971 1078 }
Gruenfrosch 0:7627c79db971 1079
Gruenfrosch 0:7627c79db971 1080 /* y (0..14) */
Gruenfrosch 0:7627c79db971 1081
Gruenfrosch 0:7627c79db971 1082 value = pair->value.y;
Gruenfrosch 0:7627c79db971 1083
Gruenfrosch 0:7627c79db971 1084 switch (value) {
Gruenfrosch 0:7627c79db971 1085 case 0:
Gruenfrosch 0:7627c79db971 1086 xrptr[1] = 0;
Gruenfrosch 0:7627c79db971 1087 break;
Gruenfrosch 0:7627c79db971 1088
Gruenfrosch 0:7627c79db971 1089 case 15:
Gruenfrosch 0:7627c79db971 1090 if (cachesz < linbits + 1) {
Gruenfrosch 0:7627c79db971 1091 bitcache = (bitcache << 16) | mad_bit_read(&peek, 16);
Gruenfrosch 0:7627c79db971 1092 cachesz += 16;
Gruenfrosch 0:7627c79db971 1093 bits_left -= 16;
Gruenfrosch 0:7627c79db971 1094 }
Gruenfrosch 0:7627c79db971 1095
Gruenfrosch 0:7627c79db971 1096 value += MASK(bitcache, cachesz, linbits);
Gruenfrosch 0:7627c79db971 1097 cachesz -= linbits;
Gruenfrosch 0:7627c79db971 1098
Gruenfrosch 0:7627c79db971 1099 requantized = III_requantize(value, exp);
Gruenfrosch 0:7627c79db971 1100 goto y_final;
Gruenfrosch 0:7627c79db971 1101
Gruenfrosch 0:7627c79db971 1102 default:
Gruenfrosch 0:7627c79db971 1103 if (reqhits & (1 << value))
Gruenfrosch 0:7627c79db971 1104 requantized = reqcache[value];
Gruenfrosch 0:7627c79db971 1105 else {
Gruenfrosch 0:7627c79db971 1106 reqhits |= (1 << value);
Gruenfrosch 0:7627c79db971 1107 requantized = reqcache[value] = III_requantize(value, exp);
Gruenfrosch 0:7627c79db971 1108 }
Gruenfrosch 0:7627c79db971 1109
Gruenfrosch 0:7627c79db971 1110 y_final:
Gruenfrosch 0:7627c79db971 1111 xrptr[1] = MASK1BIT(bitcache, cachesz--) ?
Gruenfrosch 0:7627c79db971 1112 -requantized : requantized;
Gruenfrosch 0:7627c79db971 1113 }
Gruenfrosch 0:7627c79db971 1114 }
Gruenfrosch 0:7627c79db971 1115 else {
Gruenfrosch 0:7627c79db971 1116 /* x (0..1) */
Gruenfrosch 0:7627c79db971 1117
Gruenfrosch 0:7627c79db971 1118 value = pair->value.x;
Gruenfrosch 0:7627c79db971 1119
Gruenfrosch 0:7627c79db971 1120 if (value == 0)
Gruenfrosch 0:7627c79db971 1121 xrptr[0] = 0;
Gruenfrosch 0:7627c79db971 1122 else {
Gruenfrosch 0:7627c79db971 1123 if (reqhits & (1 << value))
Gruenfrosch 0:7627c79db971 1124 requantized = reqcache[value];
Gruenfrosch 0:7627c79db971 1125 else {
Gruenfrosch 0:7627c79db971 1126 reqhits |= (1 << value);
Gruenfrosch 0:7627c79db971 1127 requantized = reqcache[value] = III_requantize(value, exp);
Gruenfrosch 0:7627c79db971 1128 }
Gruenfrosch 0:7627c79db971 1129
Gruenfrosch 0:7627c79db971 1130 xrptr[0] = MASK1BIT(bitcache, cachesz--) ?
Gruenfrosch 0:7627c79db971 1131 -requantized : requantized;
Gruenfrosch 0:7627c79db971 1132 }
Gruenfrosch 0:7627c79db971 1133
Gruenfrosch 0:7627c79db971 1134 /* y (0..1) */
Gruenfrosch 0:7627c79db971 1135
Gruenfrosch 0:7627c79db971 1136 value = pair->value.y;
Gruenfrosch 0:7627c79db971 1137
Gruenfrosch 0:7627c79db971 1138 if (value == 0)
Gruenfrosch 0:7627c79db971 1139 xrptr[1] = 0;
Gruenfrosch 0:7627c79db971 1140 else {
Gruenfrosch 0:7627c79db971 1141 if (reqhits & (1 << value))
Gruenfrosch 0:7627c79db971 1142 requantized = reqcache[value];
Gruenfrosch 0:7627c79db971 1143 else {
Gruenfrosch 0:7627c79db971 1144 reqhits |= (1 << value);
Gruenfrosch 0:7627c79db971 1145 requantized = reqcache[value] = III_requantize(value, exp);
Gruenfrosch 0:7627c79db971 1146 }
Gruenfrosch 0:7627c79db971 1147
Gruenfrosch 0:7627c79db971 1148 xrptr[1] = MASK1BIT(bitcache, cachesz--) ?
Gruenfrosch 0:7627c79db971 1149 -requantized : requantized;
Gruenfrosch 0:7627c79db971 1150 }
Gruenfrosch 0:7627c79db971 1151 }
Gruenfrosch 0:7627c79db971 1152
Gruenfrosch 0:7627c79db971 1153 xrptr += 2;
Gruenfrosch 0:7627c79db971 1154 }
Gruenfrosch 0:7627c79db971 1155 }
Gruenfrosch 0:7627c79db971 1156
Gruenfrosch 0:7627c79db971 1157 if (cachesz + bits_left < 0)
Gruenfrosch 0:7627c79db971 1158 return MAD_ERROR_BADHUFFDATA; /* big_values overrun */
Gruenfrosch 0:7627c79db971 1159
Gruenfrosch 0:7627c79db971 1160 /* count1 */
Gruenfrosch 0:7627c79db971 1161 {
Gruenfrosch 0:7627c79db971 1162 union huffquad const *table;
Gruenfrosch 0:7627c79db971 1163 register mad_fixed_t requantized;
Gruenfrosch 0:7627c79db971 1164
Gruenfrosch 0:7627c79db971 1165 table = mad_huff_quad_table[channel->flags & count1table_select];
Gruenfrosch 0:7627c79db971 1166
Gruenfrosch 0:7627c79db971 1167 requantized = III_requantize(1, exp);
Gruenfrosch 0:7627c79db971 1168
Gruenfrosch 0:7627c79db971 1169 while (cachesz + bits_left > 0 && xrptr <= &xr[572]) {
Gruenfrosch 0:7627c79db971 1170 union huffquad const *quad;
Gruenfrosch 0:7627c79db971 1171
Gruenfrosch 0:7627c79db971 1172 /* hcod (1..6) */
Gruenfrosch 0:7627c79db971 1173
Gruenfrosch 0:7627c79db971 1174 if (cachesz < 10) {
Gruenfrosch 0:7627c79db971 1175 bitcache = (bitcache << 16) | mad_bit_read(&peek, 16);
Gruenfrosch 0:7627c79db971 1176 cachesz += 16;
Gruenfrosch 0:7627c79db971 1177 bits_left -= 16;
Gruenfrosch 0:7627c79db971 1178 }
Gruenfrosch 0:7627c79db971 1179
Gruenfrosch 0:7627c79db971 1180 quad = &table[MASK(bitcache, cachesz, 4)];
Gruenfrosch 0:7627c79db971 1181
Gruenfrosch 0:7627c79db971 1182 /* quad tables guaranteed to have at most one extra lookup */
Gruenfrosch 0:7627c79db971 1183 if (!quad->final) {
Gruenfrosch 0:7627c79db971 1184 cachesz -= 4;
Gruenfrosch 0:7627c79db971 1185
Gruenfrosch 0:7627c79db971 1186 quad = &table[quad->ptr.offset +
Gruenfrosch 0:7627c79db971 1187 MASK(bitcache, cachesz, quad->ptr.bits)];
Gruenfrosch 0:7627c79db971 1188 }
Gruenfrosch 0:7627c79db971 1189
Gruenfrosch 0:7627c79db971 1190 cachesz -= quad->value.hlen;
Gruenfrosch 0:7627c79db971 1191
Gruenfrosch 0:7627c79db971 1192 if (xrptr == sfbound) {
Gruenfrosch 0:7627c79db971 1193 sfbound += *sfbwidth++;
Gruenfrosch 0:7627c79db971 1194
Gruenfrosch 0:7627c79db971 1195 if (exp != *expptr) {
Gruenfrosch 0:7627c79db971 1196 exp = *expptr;
Gruenfrosch 0:7627c79db971 1197 requantized = III_requantize(1, exp);
Gruenfrosch 0:7627c79db971 1198 }
Gruenfrosch 0:7627c79db971 1199
Gruenfrosch 0:7627c79db971 1200 ++expptr;
Gruenfrosch 0:7627c79db971 1201 }
Gruenfrosch 0:7627c79db971 1202
Gruenfrosch 0:7627c79db971 1203 /* v (0..1) */
Gruenfrosch 0:7627c79db971 1204
Gruenfrosch 0:7627c79db971 1205 xrptr[0] = quad->value.v ?
Gruenfrosch 0:7627c79db971 1206 (MASK1BIT(bitcache, cachesz--) ? -requantized : requantized) : 0;
Gruenfrosch 0:7627c79db971 1207
Gruenfrosch 0:7627c79db971 1208 /* w (0..1) */
Gruenfrosch 0:7627c79db971 1209
Gruenfrosch 0:7627c79db971 1210 xrptr[1] = quad->value.w ?
Gruenfrosch 0:7627c79db971 1211 (MASK1BIT(bitcache, cachesz--) ? -requantized : requantized) : 0;
Gruenfrosch 0:7627c79db971 1212
Gruenfrosch 0:7627c79db971 1213 xrptr += 2;
Gruenfrosch 0:7627c79db971 1214
Gruenfrosch 0:7627c79db971 1215 if (xrptr == sfbound) {
Gruenfrosch 0:7627c79db971 1216 sfbound += *sfbwidth++;
Gruenfrosch 0:7627c79db971 1217
Gruenfrosch 0:7627c79db971 1218 if (exp != *expptr) {
Gruenfrosch 0:7627c79db971 1219 exp = *expptr;
Gruenfrosch 0:7627c79db971 1220 requantized = III_requantize(1, exp);
Gruenfrosch 0:7627c79db971 1221 }
Gruenfrosch 0:7627c79db971 1222
Gruenfrosch 0:7627c79db971 1223 ++expptr;
Gruenfrosch 0:7627c79db971 1224 }
Gruenfrosch 0:7627c79db971 1225
Gruenfrosch 0:7627c79db971 1226 /* x (0..1) */
Gruenfrosch 0:7627c79db971 1227
Gruenfrosch 0:7627c79db971 1228 xrptr[0] = quad->value.x ?
Gruenfrosch 0:7627c79db971 1229 (MASK1BIT(bitcache, cachesz--) ? -requantized : requantized) : 0;
Gruenfrosch 0:7627c79db971 1230
Gruenfrosch 0:7627c79db971 1231 /* y (0..1) */
Gruenfrosch 0:7627c79db971 1232
Gruenfrosch 0:7627c79db971 1233 xrptr[1] = quad->value.y ?
Gruenfrosch 0:7627c79db971 1234 (MASK1BIT(bitcache, cachesz--) ? -requantized : requantized) : 0;
Gruenfrosch 0:7627c79db971 1235
Gruenfrosch 0:7627c79db971 1236 xrptr += 2;
Gruenfrosch 0:7627c79db971 1237 }
Gruenfrosch 0:7627c79db971 1238
Gruenfrosch 0:7627c79db971 1239 if (cachesz + bits_left < 0) {
Gruenfrosch 0:7627c79db971 1240 # if 0 && defined(DEBUG)
Gruenfrosch 0:7627c79db971 1241 fprintf(stderr, "huffman count1 overrun (%d bits)\n",
Gruenfrosch 0:7627c79db971 1242 -(cachesz + bits_left));
Gruenfrosch 0:7627c79db971 1243 # endif
Gruenfrosch 0:7627c79db971 1244
Gruenfrosch 0:7627c79db971 1245 /* technically the bitstream is misformatted, but apparently
Gruenfrosch 0:7627c79db971 1246 some encoders are just a bit sloppy with stuffing bits */
Gruenfrosch 0:7627c79db971 1247
Gruenfrosch 0:7627c79db971 1248 xrptr -= 4;
Gruenfrosch 0:7627c79db971 1249 }
Gruenfrosch 0:7627c79db971 1250 }
Gruenfrosch 0:7627c79db971 1251
Gruenfrosch 2:f28cf0afd021 1252 /* assert(-bits_left <= MAD_BUFFER_GUARD * CHAR_BIT);*/
Gruenfrosch 0:7627c79db971 1253
Gruenfrosch 0:7627c79db971 1254 # if 0 && defined(DEBUG)
Gruenfrosch 0:7627c79db971 1255 if (bits_left < 0)
Gruenfrosch 0:7627c79db971 1256 fprintf(stderr, "read %d bits too many\n", -bits_left);
Gruenfrosch 0:7627c79db971 1257 else if (cachesz + bits_left > 0)
Gruenfrosch 0:7627c79db971 1258 fprintf(stderr, "%d stuffing bits\n", cachesz + bits_left);
Gruenfrosch 0:7627c79db971 1259 # endif
Gruenfrosch 0:7627c79db971 1260
Gruenfrosch 0:7627c79db971 1261 /* rzero */
Gruenfrosch 0:7627c79db971 1262 while (xrptr < &xr[576]) {
Gruenfrosch 0:7627c79db971 1263 xrptr[0] = 0;
Gruenfrosch 0:7627c79db971 1264 xrptr[1] = 0;
Gruenfrosch 0:7627c79db971 1265
Gruenfrosch 0:7627c79db971 1266 xrptr += 2;
Gruenfrosch 0:7627c79db971 1267 }
Gruenfrosch 0:7627c79db971 1268
Gruenfrosch 0:7627c79db971 1269 return MAD_ERROR_NONE;
Gruenfrosch 0:7627c79db971 1270 }
Gruenfrosch 0:7627c79db971 1271
Gruenfrosch 0:7627c79db971 1272 # undef MASK
Gruenfrosch 0:7627c79db971 1273 # undef MASK1BIT
Gruenfrosch 0:7627c79db971 1274
Gruenfrosch 0:7627c79db971 1275 /*
Gruenfrosch 0:7627c79db971 1276 * NAME: III_reorder()
Gruenfrosch 0:7627c79db971 1277 * DESCRIPTION: reorder frequency lines of a short block into subband order
Gruenfrosch 0:7627c79db971 1278 */
Gruenfrosch 0:7627c79db971 1279 static
Gruenfrosch 0:7627c79db971 1280 void III_reorder(mad_fixed_t xr[576], struct channel const *channel,
Gruenfrosch 0:7627c79db971 1281 unsigned char const sfbwidth[39])
Gruenfrosch 0:7627c79db971 1282 {
Gruenfrosch 0:7627c79db971 1283 mad_fixed_t tmp[32][3][6];
Gruenfrosch 0:7627c79db971 1284 unsigned int sb, l, f, w, sbw[3], sw[3];
Gruenfrosch 0:7627c79db971 1285
Gruenfrosch 0:7627c79db971 1286 /* this is probably wrong for 8000 Hz mixed blocks */
Gruenfrosch 0:7627c79db971 1287
Gruenfrosch 0:7627c79db971 1288 sb = 0;
Gruenfrosch 0:7627c79db971 1289 if (channel->flags & mixed_block_flag) {
Gruenfrosch 0:7627c79db971 1290 sb = 2;
Gruenfrosch 0:7627c79db971 1291
Gruenfrosch 0:7627c79db971 1292 l = 0;
Gruenfrosch 0:7627c79db971 1293 while (l < 36)
Gruenfrosch 0:7627c79db971 1294 l += *sfbwidth++;
Gruenfrosch 0:7627c79db971 1295 }
Gruenfrosch 0:7627c79db971 1296
Gruenfrosch 0:7627c79db971 1297 for (w = 0; w < 3; ++w) {
Gruenfrosch 0:7627c79db971 1298 sbw[w] = sb;
Gruenfrosch 0:7627c79db971 1299 sw[w] = 0;
Gruenfrosch 0:7627c79db971 1300 }
Gruenfrosch 0:7627c79db971 1301
Gruenfrosch 0:7627c79db971 1302 f = *sfbwidth++;
Gruenfrosch 0:7627c79db971 1303 w = 0;
Gruenfrosch 0:7627c79db971 1304
Gruenfrosch 0:7627c79db971 1305 for (l = 18 * sb; l < 576; ++l) {
Gruenfrosch 0:7627c79db971 1306 if (f-- == 0) {
Gruenfrosch 0:7627c79db971 1307 f = *sfbwidth++ - 1;
Gruenfrosch 0:7627c79db971 1308 w = (w + 1) % 3;
Gruenfrosch 0:7627c79db971 1309 }
Gruenfrosch 0:7627c79db971 1310
Gruenfrosch 0:7627c79db971 1311 tmp[sbw[w]][w][sw[w]++] = xr[l];
Gruenfrosch 0:7627c79db971 1312
Gruenfrosch 0:7627c79db971 1313 if (sw[w] == 6) {
Gruenfrosch 0:7627c79db971 1314 sw[w] = 0;
Gruenfrosch 0:7627c79db971 1315 ++sbw[w];
Gruenfrosch 0:7627c79db971 1316 }
Gruenfrosch 0:7627c79db971 1317 }
Gruenfrosch 0:7627c79db971 1318
Gruenfrosch 0:7627c79db971 1319 memcpy(&xr[18 * sb], &tmp[sb], (576 - 18 * sb) * sizeof(mad_fixed_t));
Gruenfrosch 0:7627c79db971 1320 }
Gruenfrosch 0:7627c79db971 1321
Gruenfrosch 0:7627c79db971 1322 /*
Gruenfrosch 0:7627c79db971 1323 * NAME: III_stereo()
Gruenfrosch 0:7627c79db971 1324 * DESCRIPTION: perform joint stereo processing on a granule
Gruenfrosch 0:7627c79db971 1325 */
Gruenfrosch 0:7627c79db971 1326 static
Gruenfrosch 0:7627c79db971 1327 enum mad_error III_stereo(mad_fixed_t xr[2][576],
Gruenfrosch 0:7627c79db971 1328 struct granule const *granule,
Gruenfrosch 0:7627c79db971 1329 struct mad_header *header,
Gruenfrosch 0:7627c79db971 1330 unsigned char const *sfbwidth)
Gruenfrosch 0:7627c79db971 1331 {
Gruenfrosch 0:7627c79db971 1332 short modes[39];
Gruenfrosch 0:7627c79db971 1333 unsigned int sfbi, l, n, i;
Gruenfrosch 0:7627c79db971 1334
Gruenfrosch 0:7627c79db971 1335 if (granule->ch[0].block_type !=
Gruenfrosch 0:7627c79db971 1336 granule->ch[1].block_type ||
Gruenfrosch 0:7627c79db971 1337 (granule->ch[0].flags & mixed_block_flag) !=
Gruenfrosch 0:7627c79db971 1338 (granule->ch[1].flags & mixed_block_flag))
Gruenfrosch 0:7627c79db971 1339 return MAD_ERROR_BADSTEREO;
Gruenfrosch 0:7627c79db971 1340
Gruenfrosch 0:7627c79db971 1341 for (i = 0; i < 39; ++i)
Gruenfrosch 0:7627c79db971 1342 modes[i] = header->mode_extension;
Gruenfrosch 0:7627c79db971 1343
Gruenfrosch 0:7627c79db971 1344 /* intensity stereo */
Gruenfrosch 0:7627c79db971 1345
Gruenfrosch 0:7627c79db971 1346 if (header->mode_extension & I_STEREO) {
Gruenfrosch 0:7627c79db971 1347 struct channel const *right_ch = &granule->ch[1];
Gruenfrosch 0:7627c79db971 1348 mad_fixed_t const *right_xr = xr[1];
Gruenfrosch 0:7627c79db971 1349 unsigned int is_pos;
Gruenfrosch 0:7627c79db971 1350
Gruenfrosch 0:7627c79db971 1351 header->flags |= MAD_FLAG_I_STEREO;
Gruenfrosch 0:7627c79db971 1352
Gruenfrosch 0:7627c79db971 1353 /* first determine which scalefactor bands are to be processed */
Gruenfrosch 0:7627c79db971 1354
Gruenfrosch 0:7627c79db971 1355 if (right_ch->block_type == 2) {
Gruenfrosch 0:7627c79db971 1356 unsigned int lower, start, max, bound[3], w;
Gruenfrosch 0:7627c79db971 1357
Gruenfrosch 0:7627c79db971 1358 lower = start = max = bound[0] = bound[1] = bound[2] = 0;
Gruenfrosch 0:7627c79db971 1359
Gruenfrosch 0:7627c79db971 1360 sfbi = l = 0;
Gruenfrosch 0:7627c79db971 1361
Gruenfrosch 0:7627c79db971 1362 if (right_ch->flags & mixed_block_flag) {
Gruenfrosch 0:7627c79db971 1363 while (l < 36) {
Gruenfrosch 0:7627c79db971 1364 n = sfbwidth[sfbi++];
Gruenfrosch 0:7627c79db971 1365
Gruenfrosch 0:7627c79db971 1366 for (i = 0; i < n; ++i) {
Gruenfrosch 0:7627c79db971 1367 if (right_xr[i]) {
Gruenfrosch 0:7627c79db971 1368 lower = sfbi;
Gruenfrosch 0:7627c79db971 1369 break;
Gruenfrosch 0:7627c79db971 1370 }
Gruenfrosch 0:7627c79db971 1371 }
Gruenfrosch 0:7627c79db971 1372
Gruenfrosch 0:7627c79db971 1373 right_xr += n;
Gruenfrosch 0:7627c79db971 1374 l += n;
Gruenfrosch 0:7627c79db971 1375 }
Gruenfrosch 0:7627c79db971 1376
Gruenfrosch 0:7627c79db971 1377 start = sfbi;
Gruenfrosch 0:7627c79db971 1378 }
Gruenfrosch 0:7627c79db971 1379
Gruenfrosch 0:7627c79db971 1380 w = 0;
Gruenfrosch 0:7627c79db971 1381 while (l < 576) {
Gruenfrosch 0:7627c79db971 1382 n = sfbwidth[sfbi++];
Gruenfrosch 0:7627c79db971 1383
Gruenfrosch 0:7627c79db971 1384 for (i = 0; i < n; ++i) {
Gruenfrosch 0:7627c79db971 1385 if (right_xr[i]) {
Gruenfrosch 0:7627c79db971 1386 max = bound[w] = sfbi;
Gruenfrosch 0:7627c79db971 1387 break;
Gruenfrosch 0:7627c79db971 1388 }
Gruenfrosch 0:7627c79db971 1389 }
Gruenfrosch 0:7627c79db971 1390
Gruenfrosch 0:7627c79db971 1391 right_xr += n;
Gruenfrosch 0:7627c79db971 1392 l += n;
Gruenfrosch 0:7627c79db971 1393 w = (w + 1) % 3;
Gruenfrosch 0:7627c79db971 1394 }
Gruenfrosch 0:7627c79db971 1395
Gruenfrosch 0:7627c79db971 1396 if (max)
Gruenfrosch 0:7627c79db971 1397 lower = start;
Gruenfrosch 0:7627c79db971 1398
Gruenfrosch 0:7627c79db971 1399 /* long blocks */
Gruenfrosch 0:7627c79db971 1400
Gruenfrosch 0:7627c79db971 1401 for (i = 0; i < lower; ++i)
Gruenfrosch 0:7627c79db971 1402 modes[i] = header->mode_extension & ~I_STEREO;
Gruenfrosch 0:7627c79db971 1403
Gruenfrosch 0:7627c79db971 1404 /* short blocks */
Gruenfrosch 0:7627c79db971 1405
Gruenfrosch 0:7627c79db971 1406 w = 0;
Gruenfrosch 0:7627c79db971 1407 for (i = start; i < max; ++i) {
Gruenfrosch 0:7627c79db971 1408 if (i < bound[w])
Gruenfrosch 0:7627c79db971 1409 modes[i] = header->mode_extension & ~I_STEREO;
Gruenfrosch 0:7627c79db971 1410
Gruenfrosch 0:7627c79db971 1411 w = (w + 1) % 3;
Gruenfrosch 0:7627c79db971 1412 }
Gruenfrosch 0:7627c79db971 1413 }
Gruenfrosch 0:7627c79db971 1414 else { /* right_ch->block_type != 2 */
Gruenfrosch 0:7627c79db971 1415 unsigned int bound;
Gruenfrosch 0:7627c79db971 1416
Gruenfrosch 0:7627c79db971 1417 bound = 0;
Gruenfrosch 0:7627c79db971 1418 for (sfbi = l = 0; l < 576; l += n) {
Gruenfrosch 0:7627c79db971 1419 n = sfbwidth[sfbi++];
Gruenfrosch 0:7627c79db971 1420
Gruenfrosch 0:7627c79db971 1421 for (i = 0; i < n; ++i) {
Gruenfrosch 0:7627c79db971 1422 if (right_xr[i]) {
Gruenfrosch 0:7627c79db971 1423 bound = sfbi;
Gruenfrosch 0:7627c79db971 1424 break;
Gruenfrosch 0:7627c79db971 1425 }
Gruenfrosch 0:7627c79db971 1426 }
Gruenfrosch 0:7627c79db971 1427
Gruenfrosch 0:7627c79db971 1428 right_xr += n;
Gruenfrosch 0:7627c79db971 1429 }
Gruenfrosch 0:7627c79db971 1430
Gruenfrosch 0:7627c79db971 1431 for (i = 0; i < bound; ++i)
Gruenfrosch 0:7627c79db971 1432 modes[i] = header->mode_extension & ~I_STEREO;
Gruenfrosch 0:7627c79db971 1433 }
Gruenfrosch 0:7627c79db971 1434
Gruenfrosch 0:7627c79db971 1435 /* now do the actual processing */
Gruenfrosch 0:7627c79db971 1436
Gruenfrosch 0:7627c79db971 1437 if (header->flags & MAD_FLAG_LSF_EXT) {
Gruenfrosch 0:7627c79db971 1438 unsigned char const *illegal_pos = granule[1].ch[1].scalefac;
Gruenfrosch 0:7627c79db971 1439 mad_fixed_t const *lsf_scale;
Gruenfrosch 0:7627c79db971 1440
Gruenfrosch 0:7627c79db971 1441 /* intensity_scale */
Gruenfrosch 0:7627c79db971 1442 lsf_scale = is_lsf_table[right_ch->scalefac_compress & 0x1];
Gruenfrosch 0:7627c79db971 1443
Gruenfrosch 0:7627c79db971 1444 for (sfbi = l = 0; l < 576; ++sfbi, l += n) {
Gruenfrosch 0:7627c79db971 1445 n = sfbwidth[sfbi];
Gruenfrosch 0:7627c79db971 1446
Gruenfrosch 0:7627c79db971 1447 if (!(modes[sfbi] & I_STEREO))
Gruenfrosch 0:7627c79db971 1448 continue;
Gruenfrosch 0:7627c79db971 1449
Gruenfrosch 0:7627c79db971 1450 if (illegal_pos[sfbi]) {
Gruenfrosch 0:7627c79db971 1451 modes[sfbi] &= ~I_STEREO;
Gruenfrosch 0:7627c79db971 1452 continue;
Gruenfrosch 0:7627c79db971 1453 }
Gruenfrosch 0:7627c79db971 1454
Gruenfrosch 0:7627c79db971 1455 is_pos = right_ch->scalefac[sfbi];
Gruenfrosch 0:7627c79db971 1456
Gruenfrosch 0:7627c79db971 1457 for (i = 0; i < n; ++i) {
Gruenfrosch 0:7627c79db971 1458 register mad_fixed_t left;
Gruenfrosch 0:7627c79db971 1459
Gruenfrosch 0:7627c79db971 1460 left = xr[0][l + i];
Gruenfrosch 0:7627c79db971 1461
Gruenfrosch 0:7627c79db971 1462 if (is_pos == 0)
Gruenfrosch 0:7627c79db971 1463 xr[1][l + i] = left;
Gruenfrosch 0:7627c79db971 1464 else {
Gruenfrosch 0:7627c79db971 1465 register mad_fixed_t opposite;
Gruenfrosch 0:7627c79db971 1466
Gruenfrosch 0:7627c79db971 1467 opposite = mad_f_mul(left, lsf_scale[(is_pos - 1) / 2]);
Gruenfrosch 0:7627c79db971 1468
Gruenfrosch 0:7627c79db971 1469 if (is_pos & 1) {
Gruenfrosch 0:7627c79db971 1470 xr[0][l + i] = opposite;
Gruenfrosch 0:7627c79db971 1471 xr[1][l + i] = left;
Gruenfrosch 0:7627c79db971 1472 }
Gruenfrosch 0:7627c79db971 1473 else
Gruenfrosch 0:7627c79db971 1474 xr[1][l + i] = opposite;
Gruenfrosch 0:7627c79db971 1475 }
Gruenfrosch 0:7627c79db971 1476 }
Gruenfrosch 0:7627c79db971 1477 }
Gruenfrosch 0:7627c79db971 1478 }
Gruenfrosch 0:7627c79db971 1479 else { /* !(header->flags & MAD_FLAG_LSF_EXT) */
Gruenfrosch 0:7627c79db971 1480 for (sfbi = l = 0; l < 576; ++sfbi, l += n) {
Gruenfrosch 0:7627c79db971 1481 n = sfbwidth[sfbi];
Gruenfrosch 0:7627c79db971 1482
Gruenfrosch 0:7627c79db971 1483 if (!(modes[sfbi] & I_STEREO))
Gruenfrosch 0:7627c79db971 1484 continue;
Gruenfrosch 0:7627c79db971 1485
Gruenfrosch 0:7627c79db971 1486 is_pos = right_ch->scalefac[sfbi];
Gruenfrosch 0:7627c79db971 1487
Gruenfrosch 0:7627c79db971 1488 if (is_pos >= 7) { /* illegal intensity position */
Gruenfrosch 0:7627c79db971 1489 modes[sfbi] &= ~I_STEREO;
Gruenfrosch 0:7627c79db971 1490 continue;
Gruenfrosch 0:7627c79db971 1491 }
Gruenfrosch 0:7627c79db971 1492
Gruenfrosch 0:7627c79db971 1493 for (i = 0; i < n; ++i) {
Gruenfrosch 0:7627c79db971 1494 register mad_fixed_t left;
Gruenfrosch 0:7627c79db971 1495
Gruenfrosch 0:7627c79db971 1496 left = xr[0][l + i];
Gruenfrosch 0:7627c79db971 1497
Gruenfrosch 0:7627c79db971 1498 xr[0][l + i] = mad_f_mul(left, is_table[ is_pos]);
Gruenfrosch 0:7627c79db971 1499 xr[1][l + i] = mad_f_mul(left, is_table[6 - is_pos]);
Gruenfrosch 0:7627c79db971 1500 }
Gruenfrosch 0:7627c79db971 1501 }
Gruenfrosch 0:7627c79db971 1502 }
Gruenfrosch 0:7627c79db971 1503 }
Gruenfrosch 0:7627c79db971 1504
Gruenfrosch 0:7627c79db971 1505 /* middle/side stereo */
Gruenfrosch 0:7627c79db971 1506
Gruenfrosch 0:7627c79db971 1507 if (header->mode_extension & MS_STEREO) {
Gruenfrosch 0:7627c79db971 1508 register mad_fixed_t invsqrt2;
Gruenfrosch 0:7627c79db971 1509
Gruenfrosch 0:7627c79db971 1510 header->flags |= MAD_FLAG_MS_STEREO;
Gruenfrosch 0:7627c79db971 1511
Gruenfrosch 0:7627c79db971 1512 invsqrt2 = root_table[3 + -2];
Gruenfrosch 0:7627c79db971 1513
Gruenfrosch 0:7627c79db971 1514 for (sfbi = l = 0; l < 576; ++sfbi, l += n) {
Gruenfrosch 0:7627c79db971 1515 n = sfbwidth[sfbi];
Gruenfrosch 0:7627c79db971 1516
Gruenfrosch 0:7627c79db971 1517 if (modes[sfbi] != MS_STEREO)
Gruenfrosch 0:7627c79db971 1518 continue;
Gruenfrosch 0:7627c79db971 1519
Gruenfrosch 0:7627c79db971 1520 for (i = 0; i < n; ++i) {
Gruenfrosch 0:7627c79db971 1521 register mad_fixed_t m, s;
Gruenfrosch 0:7627c79db971 1522
Gruenfrosch 0:7627c79db971 1523 m = xr[0][l + i];
Gruenfrosch 0:7627c79db971 1524 s = xr[1][l + i];
Gruenfrosch 0:7627c79db971 1525
Gruenfrosch 0:7627c79db971 1526 xr[0][l + i] = mad_f_mul(m + s, invsqrt2); /* l = (m + s) / sqrt(2) */
Gruenfrosch 0:7627c79db971 1527 xr[1][l + i] = mad_f_mul(m - s, invsqrt2); /* r = (m - s) / sqrt(2) */
Gruenfrosch 0:7627c79db971 1528 }
Gruenfrosch 0:7627c79db971 1529 }
Gruenfrosch 0:7627c79db971 1530 }
Gruenfrosch 0:7627c79db971 1531
Gruenfrosch 0:7627c79db971 1532 return MAD_ERROR_NONE;
Gruenfrosch 0:7627c79db971 1533 }
Gruenfrosch 0:7627c79db971 1534
Gruenfrosch 0:7627c79db971 1535 /*
Gruenfrosch 0:7627c79db971 1536 * NAME: III_aliasreduce()
Gruenfrosch 0:7627c79db971 1537 * DESCRIPTION: perform frequency line alias reduction
Gruenfrosch 0:7627c79db971 1538 */
Gruenfrosch 0:7627c79db971 1539 static
Gruenfrosch 0:7627c79db971 1540 void III_aliasreduce(mad_fixed_t xr[576], int lines)
Gruenfrosch 0:7627c79db971 1541 {
Gruenfrosch 0:7627c79db971 1542 mad_fixed_t const *bound;
Gruenfrosch 0:7627c79db971 1543 int i;
Gruenfrosch 0:7627c79db971 1544
Gruenfrosch 0:7627c79db971 1545 bound = &xr[lines];
Gruenfrosch 0:7627c79db971 1546 for (xr += 18; xr < bound; xr += 18) {
Gruenfrosch 0:7627c79db971 1547 for (i = 0; i < 8; ++i) {
Gruenfrosch 0:7627c79db971 1548 register mad_fixed_t a, b;
Gruenfrosch 0:7627c79db971 1549 register mad_fixed64hi_t hi;
Gruenfrosch 0:7627c79db971 1550 register mad_fixed64lo_t lo;
Gruenfrosch 0:7627c79db971 1551
Gruenfrosch 0:7627c79db971 1552 a = xr[-1 - i];
Gruenfrosch 0:7627c79db971 1553 b = xr[ i];
Gruenfrosch 0:7627c79db971 1554
Gruenfrosch 0:7627c79db971 1555 # if defined(ASO_ZEROCHECK)
Gruenfrosch 0:7627c79db971 1556 if (a | b) {
Gruenfrosch 0:7627c79db971 1557 # endif
Gruenfrosch 0:7627c79db971 1558 MAD_F_ML0(hi, lo, a, cs[i]);
Gruenfrosch 0:7627c79db971 1559 MAD_F_MLA(hi, lo, -b, ca[i]);
Gruenfrosch 0:7627c79db971 1560
Gruenfrosch 0:7627c79db971 1561 xr[-1 - i] = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 1562
Gruenfrosch 0:7627c79db971 1563 MAD_F_ML0(hi, lo, b, cs[i]);
Gruenfrosch 0:7627c79db971 1564 MAD_F_MLA(hi, lo, a, ca[i]);
Gruenfrosch 0:7627c79db971 1565
Gruenfrosch 0:7627c79db971 1566 xr[ i] = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 1567 # if defined(ASO_ZEROCHECK)
Gruenfrosch 0:7627c79db971 1568 }
Gruenfrosch 0:7627c79db971 1569 # endif
Gruenfrosch 0:7627c79db971 1570 }
Gruenfrosch 0:7627c79db971 1571 }
Gruenfrosch 0:7627c79db971 1572 }
Gruenfrosch 0:7627c79db971 1573
Gruenfrosch 0:7627c79db971 1574 # if defined(ASO_IMDCT)
Gruenfrosch 0:7627c79db971 1575 void III_imdct_l(mad_fixed_t const [18], mad_fixed_t [36], unsigned int);
Gruenfrosch 0:7627c79db971 1576 # else
Gruenfrosch 0:7627c79db971 1577 # if 1
Gruenfrosch 0:7627c79db971 1578 static
Gruenfrosch 0:7627c79db971 1579 void fastsdct(mad_fixed_t const x[9], mad_fixed_t y[18])
Gruenfrosch 0:7627c79db971 1580 {
Gruenfrosch 0:7627c79db971 1581 mad_fixed_t a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12;
Gruenfrosch 0:7627c79db971 1582 mad_fixed_t a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25;
Gruenfrosch 0:7627c79db971 1583 mad_fixed_t m0, m1, m2, m3, m4, m5, m6, m7;
Gruenfrosch 0:7627c79db971 1584
Gruenfrosch 0:7627c79db971 1585 enum {
Gruenfrosch 0:7627c79db971 1586 c0 = MAD_F(0x1f838b8d), /* 2 * cos( 1 * PI / 18) */
Gruenfrosch 0:7627c79db971 1587 c1 = MAD_F(0x1bb67ae8), /* 2 * cos( 3 * PI / 18) */
Gruenfrosch 0:7627c79db971 1588 c2 = MAD_F(0x18836fa3), /* 2 * cos( 4 * PI / 18) */
Gruenfrosch 0:7627c79db971 1589 c3 = MAD_F(0x1491b752), /* 2 * cos( 5 * PI / 18) */
Gruenfrosch 0:7627c79db971 1590 c4 = MAD_F(0x0af1d43a), /* 2 * cos( 7 * PI / 18) */
Gruenfrosch 0:7627c79db971 1591 c5 = MAD_F(0x058e86a0), /* 2 * cos( 8 * PI / 18) */
Gruenfrosch 0:7627c79db971 1592 c6 = -MAD_F(0x1e11f642) /* 2 * cos(16 * PI / 18) */
Gruenfrosch 0:7627c79db971 1593 };
Gruenfrosch 0:7627c79db971 1594
Gruenfrosch 0:7627c79db971 1595 a0 = x[3] + x[5];
Gruenfrosch 0:7627c79db971 1596 a1 = x[3] - x[5];
Gruenfrosch 0:7627c79db971 1597 a2 = x[6] + x[2];
Gruenfrosch 0:7627c79db971 1598 a3 = x[6] - x[2];
Gruenfrosch 0:7627c79db971 1599 a4 = x[1] + x[7];
Gruenfrosch 0:7627c79db971 1600 a5 = x[1] - x[7];
Gruenfrosch 0:7627c79db971 1601 a6 = x[8] + x[0];
Gruenfrosch 0:7627c79db971 1602 a7 = x[8] - x[0];
Gruenfrosch 0:7627c79db971 1603
Gruenfrosch 0:7627c79db971 1604 a8 = a0 + a2;
Gruenfrosch 0:7627c79db971 1605 a9 = a0 - a2;
Gruenfrosch 0:7627c79db971 1606 a10 = a0 - a6;
Gruenfrosch 0:7627c79db971 1607 a11 = a2 - a6;
Gruenfrosch 0:7627c79db971 1608 a12 = a8 + a6;
Gruenfrosch 0:7627c79db971 1609 a13 = a1 - a3;
Gruenfrosch 0:7627c79db971 1610 a14 = a13 + a7;
Gruenfrosch 0:7627c79db971 1611 a15 = a3 + a7;
Gruenfrosch 0:7627c79db971 1612 a16 = a1 - a7;
Gruenfrosch 0:7627c79db971 1613 a17 = a1 + a3;
Gruenfrosch 0:7627c79db971 1614
Gruenfrosch 0:7627c79db971 1615 m0 = mad_f_mul(a17, -c3);
Gruenfrosch 0:7627c79db971 1616 m1 = mad_f_mul(a16, -c0);
Gruenfrosch 0:7627c79db971 1617 m2 = mad_f_mul(a15, -c4);
Gruenfrosch 0:7627c79db971 1618 m3 = mad_f_mul(a14, -c1);
Gruenfrosch 0:7627c79db971 1619 m4 = mad_f_mul(a5, -c1);
Gruenfrosch 0:7627c79db971 1620 m5 = mad_f_mul(a11, -c6);
Gruenfrosch 0:7627c79db971 1621 m6 = mad_f_mul(a10, -c5);
Gruenfrosch 0:7627c79db971 1622 m7 = mad_f_mul(a9, -c2);
Gruenfrosch 0:7627c79db971 1623
Gruenfrosch 0:7627c79db971 1624 a18 = x[4] + a4;
Gruenfrosch 0:7627c79db971 1625 a19 = 2 * x[4] - a4;
Gruenfrosch 0:7627c79db971 1626 a20 = a19 + m5;
Gruenfrosch 0:7627c79db971 1627 a21 = a19 - m5;
Gruenfrosch 0:7627c79db971 1628 a22 = a19 + m6;
Gruenfrosch 0:7627c79db971 1629 a23 = m4 + m2;
Gruenfrosch 0:7627c79db971 1630 a24 = m4 - m2;
Gruenfrosch 0:7627c79db971 1631 a25 = m4 + m1;
Gruenfrosch 0:7627c79db971 1632
Gruenfrosch 0:7627c79db971 1633 /* output to every other slot for convenience */
Gruenfrosch 0:7627c79db971 1634
Gruenfrosch 0:7627c79db971 1635 y[ 0] = a18 + a12;
Gruenfrosch 0:7627c79db971 1636 y[ 2] = m0 - a25;
Gruenfrosch 0:7627c79db971 1637 y[ 4] = m7 - a20;
Gruenfrosch 0:7627c79db971 1638 y[ 6] = m3;
Gruenfrosch 0:7627c79db971 1639 y[ 8] = a21 - m6;
Gruenfrosch 0:7627c79db971 1640 y[10] = a24 - m1;
Gruenfrosch 0:7627c79db971 1641 y[12] = a12 - 2 * a18;
Gruenfrosch 0:7627c79db971 1642 y[14] = a23 + m0;
Gruenfrosch 0:7627c79db971 1643 y[16] = a22 + m7;
Gruenfrosch 0:7627c79db971 1644 }
Gruenfrosch 0:7627c79db971 1645
Gruenfrosch 0:7627c79db971 1646 static inline
Gruenfrosch 0:7627c79db971 1647 void sdctII(mad_fixed_t const x[18], mad_fixed_t X[18])
Gruenfrosch 0:7627c79db971 1648 {
Gruenfrosch 0:7627c79db971 1649 mad_fixed_t tmp[9];
Gruenfrosch 0:7627c79db971 1650 int i;
Gruenfrosch 0:7627c79db971 1651
Gruenfrosch 0:7627c79db971 1652 /* scale[i] = 2 * cos(PI * (2 * i + 1) / (2 * 18)) */
Gruenfrosch 0:7627c79db971 1653 static mad_fixed_t const scale[9] = {
Gruenfrosch 0:7627c79db971 1654 MAD_F(0x1fe0d3b4), MAD_F(0x1ee8dd47), MAD_F(0x1d007930),
Gruenfrosch 0:7627c79db971 1655 MAD_F(0x1a367e59), MAD_F(0x16a09e66), MAD_F(0x125abcf8),
Gruenfrosch 0:7627c79db971 1656 MAD_F(0x0d8616bc), MAD_F(0x08483ee1), MAD_F(0x02c9fad7)
Gruenfrosch 0:7627c79db971 1657 };
Gruenfrosch 0:7627c79db971 1658
Gruenfrosch 0:7627c79db971 1659 /* divide the 18-point SDCT-II into two 9-point SDCT-IIs */
Gruenfrosch 0:7627c79db971 1660
Gruenfrosch 0:7627c79db971 1661 /* even input butterfly */
Gruenfrosch 0:7627c79db971 1662
Gruenfrosch 0:7627c79db971 1663 for (i = 0; i < 9; i += 3) {
Gruenfrosch 0:7627c79db971 1664 tmp[i + 0] = x[i + 0] + x[18 - (i + 0) - 1];
Gruenfrosch 0:7627c79db971 1665 tmp[i + 1] = x[i + 1] + x[18 - (i + 1) - 1];
Gruenfrosch 0:7627c79db971 1666 tmp[i + 2] = x[i + 2] + x[18 - (i + 2) - 1];
Gruenfrosch 0:7627c79db971 1667 }
Gruenfrosch 0:7627c79db971 1668
Gruenfrosch 0:7627c79db971 1669 fastsdct(tmp, &X[0]);
Gruenfrosch 0:7627c79db971 1670
Gruenfrosch 0:7627c79db971 1671 /* odd input butterfly and scaling */
Gruenfrosch 0:7627c79db971 1672
Gruenfrosch 0:7627c79db971 1673 for (i = 0; i < 9; i += 3) {
Gruenfrosch 0:7627c79db971 1674 tmp[i + 0] = mad_f_mul(x[i + 0] - x[18 - (i + 0) - 1], scale[i + 0]);
Gruenfrosch 0:7627c79db971 1675 tmp[i + 1] = mad_f_mul(x[i + 1] - x[18 - (i + 1) - 1], scale[i + 1]);
Gruenfrosch 0:7627c79db971 1676 tmp[i + 2] = mad_f_mul(x[i + 2] - x[18 - (i + 2) - 1], scale[i + 2]);
Gruenfrosch 0:7627c79db971 1677 }
Gruenfrosch 0:7627c79db971 1678
Gruenfrosch 0:7627c79db971 1679 fastsdct(tmp, &X[1]);
Gruenfrosch 0:7627c79db971 1680
Gruenfrosch 0:7627c79db971 1681 /* output accumulation */
Gruenfrosch 0:7627c79db971 1682
Gruenfrosch 0:7627c79db971 1683 for (i = 3; i < 18; i += 8) {
Gruenfrosch 0:7627c79db971 1684 X[i + 0] -= X[(i + 0) - 2];
Gruenfrosch 0:7627c79db971 1685 X[i + 2] -= X[(i + 2) - 2];
Gruenfrosch 0:7627c79db971 1686 X[i + 4] -= X[(i + 4) - 2];
Gruenfrosch 0:7627c79db971 1687 X[i + 6] -= X[(i + 6) - 2];
Gruenfrosch 0:7627c79db971 1688 }
Gruenfrosch 0:7627c79db971 1689 }
Gruenfrosch 0:7627c79db971 1690
Gruenfrosch 0:7627c79db971 1691 static inline
Gruenfrosch 0:7627c79db971 1692 void dctIV(mad_fixed_t const y[18], mad_fixed_t X[18])
Gruenfrosch 0:7627c79db971 1693 {
Gruenfrosch 0:7627c79db971 1694 mad_fixed_t tmp[18];
Gruenfrosch 0:7627c79db971 1695 int i;
Gruenfrosch 0:7627c79db971 1696
Gruenfrosch 0:7627c79db971 1697 /* scale[i] = 2 * cos(PI * (2 * i + 1) / (4 * 18)) */
Gruenfrosch 0:7627c79db971 1698 static mad_fixed_t const scale[18] = {
Gruenfrosch 0:7627c79db971 1699 MAD_F(0x1ff833fa), MAD_F(0x1fb9ea93), MAD_F(0x1f3dd120),
Gruenfrosch 0:7627c79db971 1700 MAD_F(0x1e84d969), MAD_F(0x1d906bcf), MAD_F(0x1c62648b),
Gruenfrosch 0:7627c79db971 1701 MAD_F(0x1afd100f), MAD_F(0x1963268b), MAD_F(0x1797c6a4),
Gruenfrosch 0:7627c79db971 1702 MAD_F(0x159e6f5b), MAD_F(0x137af940), MAD_F(0x11318ef3),
Gruenfrosch 0:7627c79db971 1703 MAD_F(0x0ec6a507), MAD_F(0x0c3ef153), MAD_F(0x099f61c5),
Gruenfrosch 0:7627c79db971 1704 MAD_F(0x06ed12c5), MAD_F(0x042d4544), MAD_F(0x0165547c)
Gruenfrosch 0:7627c79db971 1705 };
Gruenfrosch 0:7627c79db971 1706
Gruenfrosch 0:7627c79db971 1707 /* scaling */
Gruenfrosch 0:7627c79db971 1708
Gruenfrosch 0:7627c79db971 1709 for (i = 0; i < 18; i += 3) {
Gruenfrosch 0:7627c79db971 1710 tmp[i + 0] = mad_f_mul(y[i + 0], scale[i + 0]);
Gruenfrosch 0:7627c79db971 1711 tmp[i + 1] = mad_f_mul(y[i + 1], scale[i + 1]);
Gruenfrosch 0:7627c79db971 1712 tmp[i + 2] = mad_f_mul(y[i + 2], scale[i + 2]);
Gruenfrosch 0:7627c79db971 1713 }
Gruenfrosch 0:7627c79db971 1714
Gruenfrosch 0:7627c79db971 1715 /* SDCT-II */
Gruenfrosch 0:7627c79db971 1716
Gruenfrosch 0:7627c79db971 1717 sdctII(tmp, X);
Gruenfrosch 0:7627c79db971 1718
Gruenfrosch 0:7627c79db971 1719 /* scale reduction and output accumulation */
Gruenfrosch 0:7627c79db971 1720
Gruenfrosch 0:7627c79db971 1721 X[0] /= 2;
Gruenfrosch 0:7627c79db971 1722 for (i = 1; i < 17; i += 4) {
Gruenfrosch 0:7627c79db971 1723 X[i + 0] = X[i + 0] / 2 - X[(i + 0) - 1];
Gruenfrosch 0:7627c79db971 1724 X[i + 1] = X[i + 1] / 2 - X[(i + 1) - 1];
Gruenfrosch 0:7627c79db971 1725 X[i + 2] = X[i + 2] / 2 - X[(i + 2) - 1];
Gruenfrosch 0:7627c79db971 1726 X[i + 3] = X[i + 3] / 2 - X[(i + 3) - 1];
Gruenfrosch 0:7627c79db971 1727 }
Gruenfrosch 0:7627c79db971 1728 X[17] = X[17] / 2 - X[16];
Gruenfrosch 0:7627c79db971 1729 }
Gruenfrosch 0:7627c79db971 1730
Gruenfrosch 0:7627c79db971 1731 /*
Gruenfrosch 0:7627c79db971 1732 * NAME: imdct36
Gruenfrosch 0:7627c79db971 1733 * DESCRIPTION: perform X[18]->x[36] IMDCT using Szu-Wei Lee's fast algorithm
Gruenfrosch 0:7627c79db971 1734 */
Gruenfrosch 0:7627c79db971 1735 static inline
Gruenfrosch 0:7627c79db971 1736 void imdct36(mad_fixed_t const x[18], mad_fixed_t y[36])
Gruenfrosch 0:7627c79db971 1737 {
Gruenfrosch 0:7627c79db971 1738 mad_fixed_t tmp[18];
Gruenfrosch 0:7627c79db971 1739 int i;
Gruenfrosch 0:7627c79db971 1740
Gruenfrosch 0:7627c79db971 1741 /* DCT-IV */
Gruenfrosch 0:7627c79db971 1742
Gruenfrosch 0:7627c79db971 1743 dctIV(x, tmp);
Gruenfrosch 0:7627c79db971 1744
Gruenfrosch 0:7627c79db971 1745 /* convert 18-point DCT-IV to 36-point IMDCT */
Gruenfrosch 0:7627c79db971 1746
Gruenfrosch 0:7627c79db971 1747 for (i = 0; i < 9; i += 3) {
Gruenfrosch 0:7627c79db971 1748 y[i + 0] = tmp[9 + (i + 0)];
Gruenfrosch 0:7627c79db971 1749 y[i + 1] = tmp[9 + (i + 1)];
Gruenfrosch 0:7627c79db971 1750 y[i + 2] = tmp[9 + (i + 2)];
Gruenfrosch 0:7627c79db971 1751 }
Gruenfrosch 0:7627c79db971 1752 for (i = 9; i < 27; i += 3) {
Gruenfrosch 0:7627c79db971 1753 y[i + 0] = -tmp[36 - (9 + (i + 0)) - 1];
Gruenfrosch 0:7627c79db971 1754 y[i + 1] = -tmp[36 - (9 + (i + 1)) - 1];
Gruenfrosch 0:7627c79db971 1755 y[i + 2] = -tmp[36 - (9 + (i + 2)) - 1];
Gruenfrosch 0:7627c79db971 1756 }
Gruenfrosch 0:7627c79db971 1757 for (i = 27; i < 36; i += 3) {
Gruenfrosch 0:7627c79db971 1758 y[i + 0] = -tmp[(i + 0) - 27];
Gruenfrosch 0:7627c79db971 1759 y[i + 1] = -tmp[(i + 1) - 27];
Gruenfrosch 0:7627c79db971 1760 y[i + 2] = -tmp[(i + 2) - 27];
Gruenfrosch 0:7627c79db971 1761 }
Gruenfrosch 0:7627c79db971 1762 }
Gruenfrosch 0:7627c79db971 1763 # else
Gruenfrosch 0:7627c79db971 1764 /*
Gruenfrosch 0:7627c79db971 1765 * NAME: imdct36
Gruenfrosch 0:7627c79db971 1766 * DESCRIPTION: perform X[18]->x[36] IMDCT
Gruenfrosch 0:7627c79db971 1767 */
Gruenfrosch 0:7627c79db971 1768 static inline
Gruenfrosch 0:7627c79db971 1769 void imdct36(mad_fixed_t const X[18], mad_fixed_t x[36])
Gruenfrosch 0:7627c79db971 1770 {
Gruenfrosch 0:7627c79db971 1771 mad_fixed_t t0, t1, t2, t3, t4, t5, t6, t7;
Gruenfrosch 0:7627c79db971 1772 mad_fixed_t t8, t9, t10, t11, t12, t13, t14, t15;
Gruenfrosch 0:7627c79db971 1773 register mad_fixed64hi_t hi;
Gruenfrosch 0:7627c79db971 1774 register mad_fixed64lo_t lo;
Gruenfrosch 0:7627c79db971 1775
Gruenfrosch 0:7627c79db971 1776 MAD_F_ML0(hi, lo, X[4], MAD_F(0x0ec835e8));
Gruenfrosch 0:7627c79db971 1777 MAD_F_MLA(hi, lo, X[13], MAD_F(0x061f78aa));
Gruenfrosch 0:7627c79db971 1778
Gruenfrosch 0:7627c79db971 1779 t6 = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 1780
Gruenfrosch 0:7627c79db971 1781 MAD_F_MLA(hi, lo, (t14 = X[1] - X[10]), -MAD_F(0x061f78aa));
Gruenfrosch 0:7627c79db971 1782 MAD_F_MLA(hi, lo, (t15 = X[7] + X[16]), -MAD_F(0x0ec835e8));
Gruenfrosch 0:7627c79db971 1783
Gruenfrosch 0:7627c79db971 1784 t0 = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 1785
Gruenfrosch 0:7627c79db971 1786 MAD_F_MLA(hi, lo, (t8 = X[0] - X[11] - X[12]), MAD_F(0x0216a2a2));
Gruenfrosch 0:7627c79db971 1787 MAD_F_MLA(hi, lo, (t9 = X[2] - X[9] - X[14]), MAD_F(0x09bd7ca0));
Gruenfrosch 0:7627c79db971 1788 MAD_F_MLA(hi, lo, (t10 = X[3] - X[8] - X[15]), -MAD_F(0x0cb19346));
Gruenfrosch 0:7627c79db971 1789 MAD_F_MLA(hi, lo, (t11 = X[5] - X[6] - X[17]), -MAD_F(0x0fdcf549));
Gruenfrosch 0:7627c79db971 1790
Gruenfrosch 0:7627c79db971 1791 x[7] = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 1792 x[10] = -x[7];
Gruenfrosch 0:7627c79db971 1793
Gruenfrosch 0:7627c79db971 1794 MAD_F_ML0(hi, lo, t8, -MAD_F(0x0cb19346));
Gruenfrosch 0:7627c79db971 1795 MAD_F_MLA(hi, lo, t9, MAD_F(0x0fdcf549));
Gruenfrosch 0:7627c79db971 1796 MAD_F_MLA(hi, lo, t10, MAD_F(0x0216a2a2));
Gruenfrosch 0:7627c79db971 1797 MAD_F_MLA(hi, lo, t11, -MAD_F(0x09bd7ca0));
Gruenfrosch 0:7627c79db971 1798
Gruenfrosch 0:7627c79db971 1799 x[19] = x[34] = MAD_F_MLZ(hi, lo) - t0;
Gruenfrosch 0:7627c79db971 1800
Gruenfrosch 0:7627c79db971 1801 t12 = X[0] - X[3] + X[8] - X[11] - X[12] + X[15];
Gruenfrosch 0:7627c79db971 1802 t13 = X[2] + X[5] - X[6] - X[9] - X[14] - X[17];
Gruenfrosch 0:7627c79db971 1803
Gruenfrosch 0:7627c79db971 1804 MAD_F_ML0(hi, lo, t12, -MAD_F(0x0ec835e8));
Gruenfrosch 0:7627c79db971 1805 MAD_F_MLA(hi, lo, t13, MAD_F(0x061f78aa));
Gruenfrosch 0:7627c79db971 1806
Gruenfrosch 0:7627c79db971 1807 x[22] = x[31] = MAD_F_MLZ(hi, lo) + t0;
Gruenfrosch 0:7627c79db971 1808
Gruenfrosch 0:7627c79db971 1809 MAD_F_ML0(hi, lo, X[1], -MAD_F(0x09bd7ca0));
Gruenfrosch 0:7627c79db971 1810 MAD_F_MLA(hi, lo, X[7], MAD_F(0x0216a2a2));
Gruenfrosch 0:7627c79db971 1811 MAD_F_MLA(hi, lo, X[10], -MAD_F(0x0fdcf549));
Gruenfrosch 0:7627c79db971 1812 MAD_F_MLA(hi, lo, X[16], MAD_F(0x0cb19346));
Gruenfrosch 0:7627c79db971 1813
Gruenfrosch 0:7627c79db971 1814 t1 = MAD_F_MLZ(hi, lo) + t6;
Gruenfrosch 0:7627c79db971 1815
Gruenfrosch 0:7627c79db971 1816 MAD_F_ML0(hi, lo, X[0], MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 1817 MAD_F_MLA(hi, lo, X[2], MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 1818 MAD_F_MLA(hi, lo, X[3], -MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 1819 MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 1820 MAD_F_MLA(hi, lo, X[6], MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 1821 MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 1822 MAD_F_MLA(hi, lo, X[9], MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 1823 MAD_F_MLA(hi, lo, X[11], MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 1824 MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 1825 MAD_F_MLA(hi, lo, X[14], MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 1826 MAD_F_MLA(hi, lo, X[15], -MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 1827 MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 1828
Gruenfrosch 0:7627c79db971 1829 x[6] = MAD_F_MLZ(hi, lo) + t1;
Gruenfrosch 0:7627c79db971 1830 x[11] = -x[6];
Gruenfrosch 0:7627c79db971 1831
Gruenfrosch 0:7627c79db971 1832 MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 1833 MAD_F_MLA(hi, lo, X[2], -MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 1834 MAD_F_MLA(hi, lo, X[3], MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 1835 MAD_F_MLA(hi, lo, X[5], MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 1836 MAD_F_MLA(hi, lo, X[6], MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 1837 MAD_F_MLA(hi, lo, X[8], -MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 1838 MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 1839 MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 1840 MAD_F_MLA(hi, lo, X[12], -MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 1841 MAD_F_MLA(hi, lo, X[14], MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 1842 MAD_F_MLA(hi, lo, X[15], MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 1843 MAD_F_MLA(hi, lo, X[17], MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 1844
Gruenfrosch 0:7627c79db971 1845 x[23] = x[30] = MAD_F_MLZ(hi, lo) + t1;
Gruenfrosch 0:7627c79db971 1846
Gruenfrosch 0:7627c79db971 1847 MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 1848 MAD_F_MLA(hi, lo, X[2], MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 1849 MAD_F_MLA(hi, lo, X[3], -MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 1850 MAD_F_MLA(hi, lo, X[5], MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 1851 MAD_F_MLA(hi, lo, X[6], MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 1852 MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 1853 MAD_F_MLA(hi, lo, X[9], -MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 1854 MAD_F_MLA(hi, lo, X[11], MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 1855 MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 1856 MAD_F_MLA(hi, lo, X[14], MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 1857 MAD_F_MLA(hi, lo, X[15], MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 1858 MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 1859
Gruenfrosch 0:7627c79db971 1860 x[18] = x[35] = MAD_F_MLZ(hi, lo) - t1;
Gruenfrosch 0:7627c79db971 1861
Gruenfrosch 0:7627c79db971 1862 MAD_F_ML0(hi, lo, X[4], MAD_F(0x061f78aa));
Gruenfrosch 0:7627c79db971 1863 MAD_F_MLA(hi, lo, X[13], -MAD_F(0x0ec835e8));
Gruenfrosch 0:7627c79db971 1864
Gruenfrosch 0:7627c79db971 1865 t7 = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 1866
Gruenfrosch 0:7627c79db971 1867 MAD_F_MLA(hi, lo, X[1], -MAD_F(0x0cb19346));
Gruenfrosch 0:7627c79db971 1868 MAD_F_MLA(hi, lo, X[7], MAD_F(0x0fdcf549));
Gruenfrosch 0:7627c79db971 1869 MAD_F_MLA(hi, lo, X[10], MAD_F(0x0216a2a2));
Gruenfrosch 0:7627c79db971 1870 MAD_F_MLA(hi, lo, X[16], -MAD_F(0x09bd7ca0));
Gruenfrosch 0:7627c79db971 1871
Gruenfrosch 0:7627c79db971 1872 t2 = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 1873
Gruenfrosch 0:7627c79db971 1874 MAD_F_MLA(hi, lo, X[0], MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 1875 MAD_F_MLA(hi, lo, X[2], MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 1876 MAD_F_MLA(hi, lo, X[3], -MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 1877 MAD_F_MLA(hi, lo, X[5], MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 1878 MAD_F_MLA(hi, lo, X[6], -MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 1879 MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 1880 MAD_F_MLA(hi, lo, X[9], MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 1881 MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 1882 MAD_F_MLA(hi, lo, X[12], MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 1883 MAD_F_MLA(hi, lo, X[14], MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 1884 MAD_F_MLA(hi, lo, X[15], MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 1885 MAD_F_MLA(hi, lo, X[17], MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 1886
Gruenfrosch 0:7627c79db971 1887 x[5] = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 1888 x[12] = -x[5];
Gruenfrosch 0:7627c79db971 1889
Gruenfrosch 0:7627c79db971 1890 MAD_F_ML0(hi, lo, X[0], MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 1891 MAD_F_MLA(hi, lo, X[2], -MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 1892 MAD_F_MLA(hi, lo, X[3], MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 1893 MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 1894 MAD_F_MLA(hi, lo, X[6], -MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 1895 MAD_F_MLA(hi, lo, X[8], MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 1896 MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 1897 MAD_F_MLA(hi, lo, X[11], MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 1898 MAD_F_MLA(hi, lo, X[12], -MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 1899 MAD_F_MLA(hi, lo, X[14], MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 1900 MAD_F_MLA(hi, lo, X[15], MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 1901 MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 1902
Gruenfrosch 0:7627c79db971 1903 x[0] = MAD_F_MLZ(hi, lo) + t2;
Gruenfrosch 0:7627c79db971 1904 x[17] = -x[0];
Gruenfrosch 0:7627c79db971 1905
Gruenfrosch 0:7627c79db971 1906 MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 1907 MAD_F_MLA(hi, lo, X[2], -MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 1908 MAD_F_MLA(hi, lo, X[3], -MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 1909 MAD_F_MLA(hi, lo, X[5], MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 1910 MAD_F_MLA(hi, lo, X[6], MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 1911 MAD_F_MLA(hi, lo, X[8], MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 1912 MAD_F_MLA(hi, lo, X[9], MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 1913 MAD_F_MLA(hi, lo, X[11], -MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 1914 MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 1915 MAD_F_MLA(hi, lo, X[14], -MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 1916 MAD_F_MLA(hi, lo, X[15], -MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 1917 MAD_F_MLA(hi, lo, X[17], -MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 1918
Gruenfrosch 0:7627c79db971 1919 x[24] = x[29] = MAD_F_MLZ(hi, lo) + t2;
Gruenfrosch 0:7627c79db971 1920
Gruenfrosch 0:7627c79db971 1921 MAD_F_ML0(hi, lo, X[1], -MAD_F(0x0216a2a2));
Gruenfrosch 0:7627c79db971 1922 MAD_F_MLA(hi, lo, X[7], -MAD_F(0x09bd7ca0));
Gruenfrosch 0:7627c79db971 1923 MAD_F_MLA(hi, lo, X[10], MAD_F(0x0cb19346));
Gruenfrosch 0:7627c79db971 1924 MAD_F_MLA(hi, lo, X[16], MAD_F(0x0fdcf549));
Gruenfrosch 0:7627c79db971 1925
Gruenfrosch 0:7627c79db971 1926 t3 = MAD_F_MLZ(hi, lo) + t7;
Gruenfrosch 0:7627c79db971 1927
Gruenfrosch 0:7627c79db971 1928 MAD_F_ML0(hi, lo, X[0], MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 1929 MAD_F_MLA(hi, lo, X[2], MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 1930 MAD_F_MLA(hi, lo, X[3], -MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 1931 MAD_F_MLA(hi, lo, X[5], -MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 1932 MAD_F_MLA(hi, lo, X[6], MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 1933 MAD_F_MLA(hi, lo, X[8], MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 1934 MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 1935 MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 1936 MAD_F_MLA(hi, lo, X[12], MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 1937 MAD_F_MLA(hi, lo, X[14], MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 1938 MAD_F_MLA(hi, lo, X[15], -MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 1939 MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 1940
Gruenfrosch 0:7627c79db971 1941 x[8] = MAD_F_MLZ(hi, lo) + t3;
Gruenfrosch 0:7627c79db971 1942 x[9] = -x[8];
Gruenfrosch 0:7627c79db971 1943
Gruenfrosch 0:7627c79db971 1944 MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 1945 MAD_F_MLA(hi, lo, X[2], MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 1946 MAD_F_MLA(hi, lo, X[3], MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 1947 MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 1948 MAD_F_MLA(hi, lo, X[6], -MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 1949 MAD_F_MLA(hi, lo, X[8], MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 1950 MAD_F_MLA(hi, lo, X[9], MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 1951 MAD_F_MLA(hi, lo, X[11], -MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 1952 MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 1953 MAD_F_MLA(hi, lo, X[14], -MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 1954 MAD_F_MLA(hi, lo, X[15], MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 1955 MAD_F_MLA(hi, lo, X[17], MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 1956
Gruenfrosch 0:7627c79db971 1957 x[21] = x[32] = MAD_F_MLZ(hi, lo) + t3;
Gruenfrosch 0:7627c79db971 1958
Gruenfrosch 0:7627c79db971 1959 MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 1960 MAD_F_MLA(hi, lo, X[2], MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 1961 MAD_F_MLA(hi, lo, X[3], MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 1962 MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 1963 MAD_F_MLA(hi, lo, X[6], -MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 1964 MAD_F_MLA(hi, lo, X[8], MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 1965 MAD_F_MLA(hi, lo, X[9], MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 1966 MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 1967 MAD_F_MLA(hi, lo, X[12], MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 1968 MAD_F_MLA(hi, lo, X[14], MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 1969 MAD_F_MLA(hi, lo, X[15], -MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 1970 MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 1971
Gruenfrosch 0:7627c79db971 1972 x[20] = x[33] = MAD_F_MLZ(hi, lo) - t3;
Gruenfrosch 0:7627c79db971 1973
Gruenfrosch 0:7627c79db971 1974 MAD_F_ML0(hi, lo, t14, -MAD_F(0x0ec835e8));
Gruenfrosch 0:7627c79db971 1975 MAD_F_MLA(hi, lo, t15, MAD_F(0x061f78aa));
Gruenfrosch 0:7627c79db971 1976
Gruenfrosch 0:7627c79db971 1977 t4 = MAD_F_MLZ(hi, lo) - t7;
Gruenfrosch 0:7627c79db971 1978
Gruenfrosch 0:7627c79db971 1979 MAD_F_ML0(hi, lo, t12, MAD_F(0x061f78aa));
Gruenfrosch 0:7627c79db971 1980 MAD_F_MLA(hi, lo, t13, MAD_F(0x0ec835e8));
Gruenfrosch 0:7627c79db971 1981
Gruenfrosch 0:7627c79db971 1982 x[4] = MAD_F_MLZ(hi, lo) + t4;
Gruenfrosch 0:7627c79db971 1983 x[13] = -x[4];
Gruenfrosch 0:7627c79db971 1984
Gruenfrosch 0:7627c79db971 1985 MAD_F_ML0(hi, lo, t8, MAD_F(0x09bd7ca0));
Gruenfrosch 0:7627c79db971 1986 MAD_F_MLA(hi, lo, t9, -MAD_F(0x0216a2a2));
Gruenfrosch 0:7627c79db971 1987 MAD_F_MLA(hi, lo, t10, MAD_F(0x0fdcf549));
Gruenfrosch 0:7627c79db971 1988 MAD_F_MLA(hi, lo, t11, -MAD_F(0x0cb19346));
Gruenfrosch 0:7627c79db971 1989
Gruenfrosch 0:7627c79db971 1990 x[1] = MAD_F_MLZ(hi, lo) + t4;
Gruenfrosch 0:7627c79db971 1991 x[16] = -x[1];
Gruenfrosch 0:7627c79db971 1992
Gruenfrosch 0:7627c79db971 1993 MAD_F_ML0(hi, lo, t8, -MAD_F(0x0fdcf549));
Gruenfrosch 0:7627c79db971 1994 MAD_F_MLA(hi, lo, t9, -MAD_F(0x0cb19346));
Gruenfrosch 0:7627c79db971 1995 MAD_F_MLA(hi, lo, t10, -MAD_F(0x09bd7ca0));
Gruenfrosch 0:7627c79db971 1996 MAD_F_MLA(hi, lo, t11, -MAD_F(0x0216a2a2));
Gruenfrosch 0:7627c79db971 1997
Gruenfrosch 0:7627c79db971 1998 x[25] = x[28] = MAD_F_MLZ(hi, lo) + t4;
Gruenfrosch 0:7627c79db971 1999
Gruenfrosch 0:7627c79db971 2000 MAD_F_ML0(hi, lo, X[1], -MAD_F(0x0fdcf549));
Gruenfrosch 0:7627c79db971 2001 MAD_F_MLA(hi, lo, X[7], -MAD_F(0x0cb19346));
Gruenfrosch 0:7627c79db971 2002 MAD_F_MLA(hi, lo, X[10], -MAD_F(0x09bd7ca0));
Gruenfrosch 0:7627c79db971 2003 MAD_F_MLA(hi, lo, X[16], -MAD_F(0x0216a2a2));
Gruenfrosch 0:7627c79db971 2004
Gruenfrosch 0:7627c79db971 2005 t5 = MAD_F_MLZ(hi, lo) - t6;
Gruenfrosch 0:7627c79db971 2006
Gruenfrosch 0:7627c79db971 2007 MAD_F_ML0(hi, lo, X[0], MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 2008 MAD_F_MLA(hi, lo, X[2], MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 2009 MAD_F_MLA(hi, lo, X[3], MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 2010 MAD_F_MLA(hi, lo, X[5], MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 2011 MAD_F_MLA(hi, lo, X[6], MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 2012 MAD_F_MLA(hi, lo, X[8], -MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 2013 MAD_F_MLA(hi, lo, X[9], MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 2014 MAD_F_MLA(hi, lo, X[11], -MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 2015 MAD_F_MLA(hi, lo, X[12], MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 2016 MAD_F_MLA(hi, lo, X[14], -MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 2017 MAD_F_MLA(hi, lo, X[15], MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 2018 MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 2019
Gruenfrosch 0:7627c79db971 2020 x[2] = MAD_F_MLZ(hi, lo) + t5;
Gruenfrosch 0:7627c79db971 2021 x[15] = -x[2];
Gruenfrosch 0:7627c79db971 2022
Gruenfrosch 0:7627c79db971 2023 MAD_F_ML0(hi, lo, X[0], MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 2024 MAD_F_MLA(hi, lo, X[2], MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 2025 MAD_F_MLA(hi, lo, X[3], MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 2026 MAD_F_MLA(hi, lo, X[5], MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 2027 MAD_F_MLA(hi, lo, X[6], -MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 2028 MAD_F_MLA(hi, lo, X[8], MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 2029 MAD_F_MLA(hi, lo, X[9], -MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 2030 MAD_F_MLA(hi, lo, X[11], MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 2031 MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 2032 MAD_F_MLA(hi, lo, X[14], MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 2033 MAD_F_MLA(hi, lo, X[15], -MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 2034 MAD_F_MLA(hi, lo, X[17], MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 2035
Gruenfrosch 0:7627c79db971 2036 x[3] = MAD_F_MLZ(hi, lo) + t5;
Gruenfrosch 0:7627c79db971 2037 x[14] = -x[3];
Gruenfrosch 0:7627c79db971 2038
Gruenfrosch 0:7627c79db971 2039 MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0ffc19fd));
Gruenfrosch 0:7627c79db971 2040 MAD_F_MLA(hi, lo, X[2], -MAD_F(0x0f9ee890));
Gruenfrosch 0:7627c79db971 2041 MAD_F_MLA(hi, lo, X[3], -MAD_F(0x0f426cb5));
Gruenfrosch 0:7627c79db971 2042 MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0e313245));
Gruenfrosch 0:7627c79db971 2043 MAD_F_MLA(hi, lo, X[6], -MAD_F(0x0d7e8807));
Gruenfrosch 0:7627c79db971 2044 MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0bcbe352));
Gruenfrosch 0:7627c79db971 2045 MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0acf37ad));
Gruenfrosch 0:7627c79db971 2046 MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0898c779));
Gruenfrosch 0:7627c79db971 2047 MAD_F_MLA(hi, lo, X[12], -MAD_F(0x07635284));
Gruenfrosch 0:7627c79db971 2048 MAD_F_MLA(hi, lo, X[14], -MAD_F(0x04cfb0e2));
Gruenfrosch 0:7627c79db971 2049 MAD_F_MLA(hi, lo, X[15], -MAD_F(0x03768962));
Gruenfrosch 0:7627c79db971 2050 MAD_F_MLA(hi, lo, X[17], -MAD_F(0x00b2aa3e));
Gruenfrosch 0:7627c79db971 2051
Gruenfrosch 0:7627c79db971 2052 x[26] = x[27] = MAD_F_MLZ(hi, lo) + t5;
Gruenfrosch 0:7627c79db971 2053 }
Gruenfrosch 0:7627c79db971 2054 # endif
Gruenfrosch 0:7627c79db971 2055
Gruenfrosch 0:7627c79db971 2056 /*
Gruenfrosch 0:7627c79db971 2057 * NAME: III_imdct_l()
Gruenfrosch 0:7627c79db971 2058 * DESCRIPTION: perform IMDCT and windowing for long blocks
Gruenfrosch 0:7627c79db971 2059 */
Gruenfrosch 0:7627c79db971 2060 static
Gruenfrosch 0:7627c79db971 2061 void III_imdct_l(mad_fixed_t const X[18], mad_fixed_t z[36],
Gruenfrosch 0:7627c79db971 2062 unsigned int block_type)
Gruenfrosch 0:7627c79db971 2063 {
Gruenfrosch 0:7627c79db971 2064 unsigned int i;
Gruenfrosch 0:7627c79db971 2065
Gruenfrosch 0:7627c79db971 2066 /* IMDCT */
Gruenfrosch 0:7627c79db971 2067
Gruenfrosch 0:7627c79db971 2068 imdct36(X, z);
Gruenfrosch 0:7627c79db971 2069
Gruenfrosch 0:7627c79db971 2070 /* windowing */
Gruenfrosch 0:7627c79db971 2071
Gruenfrosch 0:7627c79db971 2072 switch (block_type) {
Gruenfrosch 0:7627c79db971 2073 case 0: /* normal window */
Gruenfrosch 0:7627c79db971 2074 # if defined(ASO_INTERLEAVE1)
Gruenfrosch 0:7627c79db971 2075 {
Gruenfrosch 0:7627c79db971 2076 register mad_fixed_t tmp1, tmp2;
Gruenfrosch 0:7627c79db971 2077
Gruenfrosch 0:7627c79db971 2078 tmp1 = window_l[0];
Gruenfrosch 0:7627c79db971 2079 tmp2 = window_l[1];
Gruenfrosch 0:7627c79db971 2080
Gruenfrosch 0:7627c79db971 2081 for (i = 0; i < 34; i += 2) {
Gruenfrosch 0:7627c79db971 2082 z[i + 0] = mad_f_mul(z[i + 0], tmp1);
Gruenfrosch 0:7627c79db971 2083 tmp1 = window_l[i + 2];
Gruenfrosch 0:7627c79db971 2084 z[i + 1] = mad_f_mul(z[i + 1], tmp2);
Gruenfrosch 0:7627c79db971 2085 tmp2 = window_l[i + 3];
Gruenfrosch 0:7627c79db971 2086 }
Gruenfrosch 0:7627c79db971 2087
Gruenfrosch 0:7627c79db971 2088 z[34] = mad_f_mul(z[34], tmp1);
Gruenfrosch 0:7627c79db971 2089 z[35] = mad_f_mul(z[35], tmp2);
Gruenfrosch 0:7627c79db971 2090 }
Gruenfrosch 0:7627c79db971 2091 # elif defined(ASO_INTERLEAVE2)
Gruenfrosch 0:7627c79db971 2092 {
Gruenfrosch 0:7627c79db971 2093 register mad_fixed_t tmp1, tmp2;
Gruenfrosch 0:7627c79db971 2094
Gruenfrosch 0:7627c79db971 2095 tmp1 = z[0];
Gruenfrosch 0:7627c79db971 2096 tmp2 = window_l[0];
Gruenfrosch 0:7627c79db971 2097
Gruenfrosch 0:7627c79db971 2098 for (i = 0; i < 35; ++i) {
Gruenfrosch 0:7627c79db971 2099 z[i] = mad_f_mul(tmp1, tmp2);
Gruenfrosch 0:7627c79db971 2100 tmp1 = z[i + 1];
Gruenfrosch 0:7627c79db971 2101 tmp2 = window_l[i + 1];
Gruenfrosch 0:7627c79db971 2102 }
Gruenfrosch 0:7627c79db971 2103
Gruenfrosch 0:7627c79db971 2104 z[35] = mad_f_mul(tmp1, tmp2);
Gruenfrosch 0:7627c79db971 2105 }
Gruenfrosch 0:7627c79db971 2106 # elif 1
Gruenfrosch 0:7627c79db971 2107 for (i = 0; i < 36; i += 4) {
Gruenfrosch 0:7627c79db971 2108 z[i + 0] = mad_f_mul(z[i + 0], window_l[i + 0]);
Gruenfrosch 0:7627c79db971 2109 z[i + 1] = mad_f_mul(z[i + 1], window_l[i + 1]);
Gruenfrosch 0:7627c79db971 2110 z[i + 2] = mad_f_mul(z[i + 2], window_l[i + 2]);
Gruenfrosch 0:7627c79db971 2111 z[i + 3] = mad_f_mul(z[i + 3], window_l[i + 3]);
Gruenfrosch 0:7627c79db971 2112 }
Gruenfrosch 0:7627c79db971 2113 # else
Gruenfrosch 0:7627c79db971 2114 for (i = 0; i < 36; ++i) z[i] = mad_f_mul(z[i], window_l[i]);
Gruenfrosch 0:7627c79db971 2115 # endif
Gruenfrosch 0:7627c79db971 2116 break;
Gruenfrosch 0:7627c79db971 2117
Gruenfrosch 0:7627c79db971 2118 case 1: /* start block */
Gruenfrosch 0:7627c79db971 2119 for (i = 0; i < 18; i += 3) {
Gruenfrosch 0:7627c79db971 2120 z[i + 0] = mad_f_mul(z[i + 0], window_l[i + 0]);
Gruenfrosch 0:7627c79db971 2121 z[i + 1] = mad_f_mul(z[i + 1], window_l[i + 1]);
Gruenfrosch 0:7627c79db971 2122 z[i + 2] = mad_f_mul(z[i + 2], window_l[i + 2]);
Gruenfrosch 0:7627c79db971 2123 }
Gruenfrosch 0:7627c79db971 2124 /* (i = 18; i < 24; ++i) z[i] unchanged */
Gruenfrosch 0:7627c79db971 2125 for (i = 24; i < 30; ++i) z[i] = mad_f_mul(z[i], window_s[i - 18]);
Gruenfrosch 0:7627c79db971 2126 for (i = 30; i < 36; ++i) z[i] = 0;
Gruenfrosch 0:7627c79db971 2127 break;
Gruenfrosch 0:7627c79db971 2128
Gruenfrosch 0:7627c79db971 2129 case 3: /* stop block */
Gruenfrosch 0:7627c79db971 2130 for (i = 0; i < 6; ++i) z[i] = 0;
Gruenfrosch 0:7627c79db971 2131 for (i = 6; i < 12; ++i) z[i] = mad_f_mul(z[i], window_s[i - 6]);
Gruenfrosch 0:7627c79db971 2132 /* (i = 12; i < 18; ++i) z[i] unchanged */
Gruenfrosch 0:7627c79db971 2133 for (i = 18; i < 36; i += 3) {
Gruenfrosch 0:7627c79db971 2134 z[i + 0] = mad_f_mul(z[i + 0], window_l[i + 0]);
Gruenfrosch 0:7627c79db971 2135 z[i + 1] = mad_f_mul(z[i + 1], window_l[i + 1]);
Gruenfrosch 0:7627c79db971 2136 z[i + 2] = mad_f_mul(z[i + 2], window_l[i + 2]);
Gruenfrosch 0:7627c79db971 2137 }
Gruenfrosch 0:7627c79db971 2138 break;
Gruenfrosch 0:7627c79db971 2139 }
Gruenfrosch 0:7627c79db971 2140 }
Gruenfrosch 0:7627c79db971 2141 # endif /* ASO_IMDCT */
Gruenfrosch 0:7627c79db971 2142
Gruenfrosch 0:7627c79db971 2143 /*
Gruenfrosch 0:7627c79db971 2144 * NAME: III_imdct_s()
Gruenfrosch 0:7627c79db971 2145 * DESCRIPTION: perform IMDCT and windowing for short blocks
Gruenfrosch 0:7627c79db971 2146 */
Gruenfrosch 0:7627c79db971 2147 static
Gruenfrosch 0:7627c79db971 2148 void III_imdct_s(mad_fixed_t const X[18], mad_fixed_t z[36])
Gruenfrosch 0:7627c79db971 2149 {
Gruenfrosch 0:7627c79db971 2150 mad_fixed_t y[36], *yptr;
Gruenfrosch 0:7627c79db971 2151 mad_fixed_t const *wptr;
Gruenfrosch 0:7627c79db971 2152 int w, i;
Gruenfrosch 0:7627c79db971 2153 register mad_fixed64hi_t hi;
Gruenfrosch 0:7627c79db971 2154 register mad_fixed64lo_t lo;
Gruenfrosch 0:7627c79db971 2155
Gruenfrosch 0:7627c79db971 2156 /* IMDCT */
Gruenfrosch 0:7627c79db971 2157
Gruenfrosch 0:7627c79db971 2158 yptr = &y[0];
Gruenfrosch 0:7627c79db971 2159
Gruenfrosch 0:7627c79db971 2160 for (w = 0; w < 3; ++w) {
Gruenfrosch 0:7627c79db971 2161 register mad_fixed_t const (*s)[6];
Gruenfrosch 0:7627c79db971 2162
Gruenfrosch 0:7627c79db971 2163 s = imdct_s;
Gruenfrosch 0:7627c79db971 2164
Gruenfrosch 0:7627c79db971 2165 for (i = 0; i < 3; ++i) {
Gruenfrosch 0:7627c79db971 2166 MAD_F_ML0(hi, lo, X[0], (*s)[0]);
Gruenfrosch 0:7627c79db971 2167 MAD_F_MLA(hi, lo, X[1], (*s)[1]);
Gruenfrosch 0:7627c79db971 2168 MAD_F_MLA(hi, lo, X[2], (*s)[2]);
Gruenfrosch 0:7627c79db971 2169 MAD_F_MLA(hi, lo, X[3], (*s)[3]);
Gruenfrosch 0:7627c79db971 2170 MAD_F_MLA(hi, lo, X[4], (*s)[4]);
Gruenfrosch 0:7627c79db971 2171 MAD_F_MLA(hi, lo, X[5], (*s)[5]);
Gruenfrosch 0:7627c79db971 2172
Gruenfrosch 0:7627c79db971 2173 yptr[i + 0] = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 2174 yptr[5 - i] = -yptr[i + 0];
Gruenfrosch 0:7627c79db971 2175
Gruenfrosch 0:7627c79db971 2176 ++s;
Gruenfrosch 0:7627c79db971 2177
Gruenfrosch 0:7627c79db971 2178 MAD_F_ML0(hi, lo, X[0], (*s)[0]);
Gruenfrosch 0:7627c79db971 2179 MAD_F_MLA(hi, lo, X[1], (*s)[1]);
Gruenfrosch 0:7627c79db971 2180 MAD_F_MLA(hi, lo, X[2], (*s)[2]);
Gruenfrosch 0:7627c79db971 2181 MAD_F_MLA(hi, lo, X[3], (*s)[3]);
Gruenfrosch 0:7627c79db971 2182 MAD_F_MLA(hi, lo, X[4], (*s)[4]);
Gruenfrosch 0:7627c79db971 2183 MAD_F_MLA(hi, lo, X[5], (*s)[5]);
Gruenfrosch 0:7627c79db971 2184
Gruenfrosch 0:7627c79db971 2185 yptr[ i + 6] = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 2186 yptr[11 - i] = yptr[i + 6];
Gruenfrosch 0:7627c79db971 2187
Gruenfrosch 0:7627c79db971 2188 ++s;
Gruenfrosch 0:7627c79db971 2189 }
Gruenfrosch 0:7627c79db971 2190
Gruenfrosch 0:7627c79db971 2191 yptr += 12;
Gruenfrosch 0:7627c79db971 2192 X += 6;
Gruenfrosch 0:7627c79db971 2193 }
Gruenfrosch 0:7627c79db971 2194
Gruenfrosch 0:7627c79db971 2195 /* windowing, overlapping and concatenation */
Gruenfrosch 0:7627c79db971 2196
Gruenfrosch 0:7627c79db971 2197 yptr = &y[0];
Gruenfrosch 0:7627c79db971 2198 wptr = &window_s[0];
Gruenfrosch 0:7627c79db971 2199
Gruenfrosch 0:7627c79db971 2200 for (i = 0; i < 6; ++i) {
Gruenfrosch 0:7627c79db971 2201 z[i + 0] = 0;
Gruenfrosch 0:7627c79db971 2202 z[i + 6] = mad_f_mul(yptr[ 0 + 0], wptr[0]);
Gruenfrosch 0:7627c79db971 2203
Gruenfrosch 0:7627c79db971 2204 MAD_F_ML0(hi, lo, yptr[ 0 + 6], wptr[6]);
Gruenfrosch 0:7627c79db971 2205 MAD_F_MLA(hi, lo, yptr[12 + 0], wptr[0]);
Gruenfrosch 0:7627c79db971 2206
Gruenfrosch 0:7627c79db971 2207 z[i + 12] = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 2208
Gruenfrosch 0:7627c79db971 2209 MAD_F_ML0(hi, lo, yptr[12 + 6], wptr[6]);
Gruenfrosch 0:7627c79db971 2210 MAD_F_MLA(hi, lo, yptr[24 + 0], wptr[0]);
Gruenfrosch 0:7627c79db971 2211
Gruenfrosch 0:7627c79db971 2212 z[i + 18] = MAD_F_MLZ(hi, lo);
Gruenfrosch 0:7627c79db971 2213
Gruenfrosch 0:7627c79db971 2214 z[i + 24] = mad_f_mul(yptr[24 + 6], wptr[6]);
Gruenfrosch 0:7627c79db971 2215 z[i + 30] = 0;
Gruenfrosch 0:7627c79db971 2216
Gruenfrosch 0:7627c79db971 2217 ++yptr;
Gruenfrosch 0:7627c79db971 2218 ++wptr;
Gruenfrosch 0:7627c79db971 2219 }
Gruenfrosch 0:7627c79db971 2220 }
Gruenfrosch 0:7627c79db971 2221
Gruenfrosch 0:7627c79db971 2222 /*
Gruenfrosch 0:7627c79db971 2223 * NAME: III_overlap()
Gruenfrosch 0:7627c79db971 2224 * DESCRIPTION: perform overlap-add of windowed IMDCT outputs
Gruenfrosch 0:7627c79db971 2225 */
Gruenfrosch 0:7627c79db971 2226 static
Gruenfrosch 0:7627c79db971 2227 void III_overlap(mad_fixed_t const output[36], mad_fixed_t overlap[18],
Gruenfrosch 0:7627c79db971 2228 mad_fixed_t sample[18][32], unsigned int sb)
Gruenfrosch 0:7627c79db971 2229 {
Gruenfrosch 0:7627c79db971 2230 unsigned int i;
Gruenfrosch 0:7627c79db971 2231
Gruenfrosch 0:7627c79db971 2232 # if defined(ASO_INTERLEAVE2)
Gruenfrosch 0:7627c79db971 2233 {
Gruenfrosch 0:7627c79db971 2234 register mad_fixed_t tmp1, tmp2;
Gruenfrosch 0:7627c79db971 2235
Gruenfrosch 0:7627c79db971 2236 tmp1 = overlap[0];
Gruenfrosch 0:7627c79db971 2237 tmp2 = overlap[1];
Gruenfrosch 0:7627c79db971 2238
Gruenfrosch 0:7627c79db971 2239 for (i = 0; i < 16; i += 2) {
Gruenfrosch 0:7627c79db971 2240 sample[i + 0][sb] = output[i + 0 + 0] + tmp1;
Gruenfrosch 0:7627c79db971 2241 overlap[i + 0] = output[i + 0 + 18];
Gruenfrosch 0:7627c79db971 2242 tmp1 = overlap[i + 2];
Gruenfrosch 0:7627c79db971 2243
Gruenfrosch 0:7627c79db971 2244 sample[i + 1][sb] = output[i + 1 + 0] + tmp2;
Gruenfrosch 0:7627c79db971 2245 overlap[i + 1] = output[i + 1 + 18];
Gruenfrosch 0:7627c79db971 2246 tmp2 = overlap[i + 3];
Gruenfrosch 0:7627c79db971 2247 }
Gruenfrosch 0:7627c79db971 2248
Gruenfrosch 0:7627c79db971 2249 sample[16][sb] = output[16 + 0] + tmp1;
Gruenfrosch 0:7627c79db971 2250 overlap[16] = output[16 + 18];
Gruenfrosch 0:7627c79db971 2251 sample[17][sb] = output[17 + 0] + tmp2;
Gruenfrosch 0:7627c79db971 2252 overlap[17] = output[17 + 18];
Gruenfrosch 0:7627c79db971 2253 }
Gruenfrosch 0:7627c79db971 2254 # elif 0
Gruenfrosch 0:7627c79db971 2255 for (i = 0; i < 18; i += 2) {
Gruenfrosch 0:7627c79db971 2256 sample[i + 0][sb] = output[i + 0 + 0] + overlap[i + 0];
Gruenfrosch 0:7627c79db971 2257 overlap[i + 0] = output[i + 0 + 18];
Gruenfrosch 0:7627c79db971 2258
Gruenfrosch 0:7627c79db971 2259 sample[i + 1][sb] = output[i + 1 + 0] + overlap[i + 1];
Gruenfrosch 0:7627c79db971 2260 overlap[i + 1] = output[i + 1 + 18];
Gruenfrosch 0:7627c79db971 2261 }
Gruenfrosch 0:7627c79db971 2262 # else
Gruenfrosch 0:7627c79db971 2263 for (i = 0; i < 18; ++i) {
Gruenfrosch 0:7627c79db971 2264 sample[i][sb] = output[i + 0] + overlap[i];
Gruenfrosch 0:7627c79db971 2265 overlap[i] = output[i + 18];
Gruenfrosch 0:7627c79db971 2266 }
Gruenfrosch 0:7627c79db971 2267 # endif
Gruenfrosch 0:7627c79db971 2268 }
Gruenfrosch 0:7627c79db971 2269
Gruenfrosch 0:7627c79db971 2270 /*
Gruenfrosch 0:7627c79db971 2271 * NAME: III_overlap_z()
Gruenfrosch 0:7627c79db971 2272 * DESCRIPTION: perform "overlap-add" of zero IMDCT outputs
Gruenfrosch 0:7627c79db971 2273 */
Gruenfrosch 0:7627c79db971 2274 static inline
Gruenfrosch 0:7627c79db971 2275 void III_overlap_z(mad_fixed_t overlap[18],
Gruenfrosch 0:7627c79db971 2276 mad_fixed_t sample[18][32], unsigned int sb)
Gruenfrosch 0:7627c79db971 2277 {
Gruenfrosch 0:7627c79db971 2278 unsigned int i;
Gruenfrosch 0:7627c79db971 2279
Gruenfrosch 0:7627c79db971 2280 # if defined(ASO_INTERLEAVE2)
Gruenfrosch 0:7627c79db971 2281 {
Gruenfrosch 0:7627c79db971 2282 register mad_fixed_t tmp1, tmp2;
Gruenfrosch 0:7627c79db971 2283
Gruenfrosch 0:7627c79db971 2284 tmp1 = overlap[0];
Gruenfrosch 0:7627c79db971 2285 tmp2 = overlap[1];
Gruenfrosch 0:7627c79db971 2286
Gruenfrosch 0:7627c79db971 2287 for (i = 0; i < 16; i += 2) {
Gruenfrosch 0:7627c79db971 2288 sample[i + 0][sb] = tmp1;
Gruenfrosch 0:7627c79db971 2289 overlap[i + 0] = 0;
Gruenfrosch 0:7627c79db971 2290 tmp1 = overlap[i + 2];
Gruenfrosch 0:7627c79db971 2291
Gruenfrosch 0:7627c79db971 2292 sample[i + 1][sb] = tmp2;
Gruenfrosch 0:7627c79db971 2293 overlap[i + 1] = 0;
Gruenfrosch 0:7627c79db971 2294 tmp2 = overlap[i + 3];
Gruenfrosch 0:7627c79db971 2295 }
Gruenfrosch 0:7627c79db971 2296
Gruenfrosch 0:7627c79db971 2297 sample[16][sb] = tmp1;
Gruenfrosch 0:7627c79db971 2298 overlap[16] = 0;
Gruenfrosch 0:7627c79db971 2299 sample[17][sb] = tmp2;
Gruenfrosch 0:7627c79db971 2300 overlap[17] = 0;
Gruenfrosch 0:7627c79db971 2301 }
Gruenfrosch 0:7627c79db971 2302 # else
Gruenfrosch 0:7627c79db971 2303 for (i = 0; i < 18; ++i) {
Gruenfrosch 0:7627c79db971 2304 sample[i][sb] = overlap[i];
Gruenfrosch 0:7627c79db971 2305 overlap[i] = 0;
Gruenfrosch 0:7627c79db971 2306 }
Gruenfrosch 0:7627c79db971 2307 # endif
Gruenfrosch 0:7627c79db971 2308 }
Gruenfrosch 0:7627c79db971 2309
Gruenfrosch 0:7627c79db971 2310 /*
Gruenfrosch 0:7627c79db971 2311 * NAME: III_freqinver()
Gruenfrosch 0:7627c79db971 2312 * DESCRIPTION: perform subband frequency inversion for odd sample lines
Gruenfrosch 0:7627c79db971 2313 */
Gruenfrosch 0:7627c79db971 2314 static
Gruenfrosch 0:7627c79db971 2315 void III_freqinver(mad_fixed_t sample[18][32], unsigned int sb)
Gruenfrosch 0:7627c79db971 2316 {
Gruenfrosch 0:7627c79db971 2317 unsigned int i;
Gruenfrosch 0:7627c79db971 2318
Gruenfrosch 0:7627c79db971 2319 # if 1 || defined(ASO_INTERLEAVE1) || defined(ASO_INTERLEAVE2)
Gruenfrosch 0:7627c79db971 2320 {
Gruenfrosch 0:7627c79db971 2321 register mad_fixed_t tmp1, tmp2;
Gruenfrosch 0:7627c79db971 2322
Gruenfrosch 0:7627c79db971 2323 tmp1 = sample[1][sb];
Gruenfrosch 0:7627c79db971 2324 tmp2 = sample[3][sb];
Gruenfrosch 0:7627c79db971 2325
Gruenfrosch 0:7627c79db971 2326 for (i = 1; i < 13; i += 4) {
Gruenfrosch 0:7627c79db971 2327 sample[i + 0][sb] = -tmp1;
Gruenfrosch 0:7627c79db971 2328 tmp1 = sample[i + 4][sb];
Gruenfrosch 0:7627c79db971 2329 sample[i + 2][sb] = -tmp2;
Gruenfrosch 0:7627c79db971 2330 tmp2 = sample[i + 6][sb];
Gruenfrosch 0:7627c79db971 2331 }
Gruenfrosch 0:7627c79db971 2332
Gruenfrosch 0:7627c79db971 2333 sample[13][sb] = -tmp1;
Gruenfrosch 0:7627c79db971 2334 tmp1 = sample[17][sb];
Gruenfrosch 0:7627c79db971 2335 sample[15][sb] = -tmp2;
Gruenfrosch 0:7627c79db971 2336 sample[17][sb] = -tmp1;
Gruenfrosch 0:7627c79db971 2337 }
Gruenfrosch 0:7627c79db971 2338 # else
Gruenfrosch 0:7627c79db971 2339 for (i = 1; i < 18; i += 2)
Gruenfrosch 0:7627c79db971 2340 sample[i][sb] = -sample[i][sb];
Gruenfrosch 0:7627c79db971 2341 # endif
Gruenfrosch 0:7627c79db971 2342 }
Gruenfrosch 0:7627c79db971 2343
Gruenfrosch 0:7627c79db971 2344 /*
Gruenfrosch 0:7627c79db971 2345 * NAME: III_decode()
Gruenfrosch 0:7627c79db971 2346 * DESCRIPTION: decode frame main_data
Gruenfrosch 0:7627c79db971 2347 */
Gruenfrosch 0:7627c79db971 2348 static
Gruenfrosch 0:7627c79db971 2349 enum mad_error III_decode(struct mad_bitptr *ptr, struct mad_frame *frame,
Gruenfrosch 0:7627c79db971 2350 struct sideinfo *si, unsigned int nch)
Gruenfrosch 0:7627c79db971 2351 {
Gruenfrosch 0:7627c79db971 2352 struct mad_header *header = &frame->header;
Gruenfrosch 0:7627c79db971 2353 unsigned int sfreqi, ngr, gr;
Gruenfrosch 0:7627c79db971 2354
Gruenfrosch 0:7627c79db971 2355 {
Gruenfrosch 0:7627c79db971 2356 unsigned int sfreq;
Gruenfrosch 0:7627c79db971 2357
Gruenfrosch 0:7627c79db971 2358 sfreq = header->samplerate;
Gruenfrosch 0:7627c79db971 2359 if (header->flags & MAD_FLAG_MPEG_2_5_EXT)
Gruenfrosch 0:7627c79db971 2360 sfreq *= 2;
Gruenfrosch 0:7627c79db971 2361
Gruenfrosch 0:7627c79db971 2362 /* 48000 => 0, 44100 => 1, 32000 => 2,
Gruenfrosch 0:7627c79db971 2363 24000 => 3, 22050 => 4, 16000 => 5 */
Gruenfrosch 0:7627c79db971 2364 sfreqi = ((sfreq >> 7) & 0x000f) +
Gruenfrosch 0:7627c79db971 2365 ((sfreq >> 15) & 0x0001) - 8;
Gruenfrosch 0:7627c79db971 2366
Gruenfrosch 0:7627c79db971 2367 if (header->flags & MAD_FLAG_MPEG_2_5_EXT)
Gruenfrosch 0:7627c79db971 2368 sfreqi += 3;
Gruenfrosch 0:7627c79db971 2369 }
Gruenfrosch 0:7627c79db971 2370
Gruenfrosch 0:7627c79db971 2371 /* scalefactors, Huffman decoding, requantization */
Gruenfrosch 0:7627c79db971 2372
Gruenfrosch 0:7627c79db971 2373 ngr = (header->flags & MAD_FLAG_LSF_EXT) ? 1 : 2;
Gruenfrosch 0:7627c79db971 2374
Gruenfrosch 0:7627c79db971 2375 for (gr = 0; gr < ngr; ++gr) {
Gruenfrosch 0:7627c79db971 2376 struct granule *granule = &si->gr[gr];
Gruenfrosch 0:7627c79db971 2377 unsigned char const *sfbwidth[2];
Gruenfrosch 0:7627c79db971 2378 mad_fixed_t xr[2][576];
Gruenfrosch 0:7627c79db971 2379 unsigned int ch;
Gruenfrosch 0:7627c79db971 2380 enum mad_error error;
Gruenfrosch 0:7627c79db971 2381
Gruenfrosch 0:7627c79db971 2382 for (ch = 0; ch < nch; ++ch) {
Gruenfrosch 0:7627c79db971 2383 struct channel *channel = &granule->ch[ch];
Gruenfrosch 0:7627c79db971 2384 unsigned int part2_length;
Gruenfrosch 0:7627c79db971 2385
Gruenfrosch 0:7627c79db971 2386 sfbwidth[ch] = sfbwidth_table[sfreqi].l;
Gruenfrosch 0:7627c79db971 2387 if (channel->block_type == 2) {
Gruenfrosch 0:7627c79db971 2388 sfbwidth[ch] = (channel->flags & mixed_block_flag) ?
Gruenfrosch 0:7627c79db971 2389 sfbwidth_table[sfreqi].m : sfbwidth_table[sfreqi].s;
Gruenfrosch 0:7627c79db971 2390 }
Gruenfrosch 0:7627c79db971 2391
Gruenfrosch 0:7627c79db971 2392 if (header->flags & MAD_FLAG_LSF_EXT) {
Gruenfrosch 0:7627c79db971 2393 part2_length = III_scalefactors_lsf(ptr, channel,
Gruenfrosch 0:7627c79db971 2394 ch == 0 ? 0 : &si->gr[1].ch[1],
Gruenfrosch 0:7627c79db971 2395 header->mode_extension);
Gruenfrosch 0:7627c79db971 2396 }
Gruenfrosch 0:7627c79db971 2397 else {
Gruenfrosch 0:7627c79db971 2398 part2_length = III_scalefactors(ptr, channel, &si->gr[0].ch[ch],
Gruenfrosch 0:7627c79db971 2399 gr == 0 ? 0 : si->scfsi[ch]);
Gruenfrosch 0:7627c79db971 2400 }
Gruenfrosch 0:7627c79db971 2401
Gruenfrosch 0:7627c79db971 2402 error = III_huffdecode(ptr, xr[ch], channel, sfbwidth[ch], part2_length);
Gruenfrosch 0:7627c79db971 2403 if (error)
Gruenfrosch 0:7627c79db971 2404 return error;
Gruenfrosch 0:7627c79db971 2405 }
Gruenfrosch 0:7627c79db971 2406
Gruenfrosch 0:7627c79db971 2407 /* joint stereo processing */
Gruenfrosch 0:7627c79db971 2408
Gruenfrosch 0:7627c79db971 2409 if (header->mode == MAD_MODE_JOINT_STEREO && header->mode_extension) {
Gruenfrosch 0:7627c79db971 2410 error = III_stereo(xr, granule, header, sfbwidth[0]);
Gruenfrosch 0:7627c79db971 2411 if (error)
Gruenfrosch 0:7627c79db971 2412 return error;
Gruenfrosch 0:7627c79db971 2413 }
Gruenfrosch 0:7627c79db971 2414
Gruenfrosch 0:7627c79db971 2415 /* reordering, alias reduction, IMDCT, overlap-add, frequency inversion */
Gruenfrosch 0:7627c79db971 2416
Gruenfrosch 0:7627c79db971 2417 for (ch = 0; ch < nch; ++ch) {
Gruenfrosch 0:7627c79db971 2418 struct channel const *channel = &granule->ch[ch];
Gruenfrosch 0:7627c79db971 2419 mad_fixed_t (*sample)[32] = &frame->sbsample[ch][18 * gr];
Gruenfrosch 0:7627c79db971 2420 unsigned int sb, l, i, sblimit;
Gruenfrosch 0:7627c79db971 2421 mad_fixed_t output[36];
Gruenfrosch 0:7627c79db971 2422
Gruenfrosch 0:7627c79db971 2423 if (channel->block_type == 2) {
Gruenfrosch 0:7627c79db971 2424 III_reorder(xr[ch], channel, sfbwidth[ch]);
Gruenfrosch 0:7627c79db971 2425
Gruenfrosch 0:7627c79db971 2426 # if !defined(OPT_STRICT)
Gruenfrosch 0:7627c79db971 2427 /*
Gruenfrosch 0:7627c79db971 2428 * According to ISO/IEC 11172-3, "Alias reduction is not applied for
Gruenfrosch 0:7627c79db971 2429 * granules with block_type == 2 (short block)." However, other
Gruenfrosch 0:7627c79db971 2430 * sources suggest alias reduction should indeed be performed on the
Gruenfrosch 0:7627c79db971 2431 * lower two subbands of mixed blocks. Most other implementations do
Gruenfrosch 0:7627c79db971 2432 * this, so by default we will too.
Gruenfrosch 0:7627c79db971 2433 */
Gruenfrosch 0:7627c79db971 2434 if (channel->flags & mixed_block_flag)
Gruenfrosch 0:7627c79db971 2435 III_aliasreduce(xr[ch], 36);
Gruenfrosch 0:7627c79db971 2436 # endif
Gruenfrosch 0:7627c79db971 2437 }
Gruenfrosch 0:7627c79db971 2438 else
Gruenfrosch 0:7627c79db971 2439 III_aliasreduce(xr[ch], 576);
Gruenfrosch 0:7627c79db971 2440
Gruenfrosch 0:7627c79db971 2441 l = 0;
Gruenfrosch 0:7627c79db971 2442
Gruenfrosch 0:7627c79db971 2443 /* subbands 0-1 */
Gruenfrosch 0:7627c79db971 2444
Gruenfrosch 0:7627c79db971 2445 if (channel->block_type != 2 || (channel->flags & mixed_block_flag)) {
Gruenfrosch 0:7627c79db971 2446 unsigned int block_type;
Gruenfrosch 0:7627c79db971 2447
Gruenfrosch 0:7627c79db971 2448 block_type = channel->block_type;
Gruenfrosch 0:7627c79db971 2449 if (channel->flags & mixed_block_flag)
Gruenfrosch 0:7627c79db971 2450 block_type = 0;
Gruenfrosch 0:7627c79db971 2451
Gruenfrosch 0:7627c79db971 2452 /* long blocks */
Gruenfrosch 0:7627c79db971 2453 for (sb = 0; sb < 2; ++sb, l += 18) {
Gruenfrosch 0:7627c79db971 2454 III_imdct_l(&xr[ch][l], output, block_type);
Gruenfrosch 2:f28cf0afd021 2455 III_overlap(output, (frame->overlap)[ch][sb], sample, sb);
Gruenfrosch 0:7627c79db971 2456 }
Gruenfrosch 0:7627c79db971 2457 }
Gruenfrosch 0:7627c79db971 2458 else {
Gruenfrosch 0:7627c79db971 2459 /* short blocks */
Gruenfrosch 0:7627c79db971 2460 for (sb = 0; sb < 2; ++sb, l += 18) {
Gruenfrosch 0:7627c79db971 2461 III_imdct_s(&xr[ch][l], output);
Gruenfrosch 2:f28cf0afd021 2462 III_overlap(output, (frame->overlap)[ch][sb], sample, sb);
Gruenfrosch 0:7627c79db971 2463 }
Gruenfrosch 0:7627c79db971 2464 }
Gruenfrosch 0:7627c79db971 2465
Gruenfrosch 0:7627c79db971 2466 III_freqinver(sample, 1);
Gruenfrosch 0:7627c79db971 2467
Gruenfrosch 0:7627c79db971 2468 /* (nonzero) subbands 2-31 */
Gruenfrosch 0:7627c79db971 2469
Gruenfrosch 0:7627c79db971 2470 i = 576;
Gruenfrosch 0:7627c79db971 2471 while (i > 36 && xr[ch][i - 1] == 0)
Gruenfrosch 0:7627c79db971 2472 --i;
Gruenfrosch 0:7627c79db971 2473
Gruenfrosch 0:7627c79db971 2474 sblimit = 32 - (576 - i) / 18;
Gruenfrosch 0:7627c79db971 2475
Gruenfrosch 0:7627c79db971 2476 if (channel->block_type != 2) {
Gruenfrosch 0:7627c79db971 2477 /* long blocks */
Gruenfrosch 0:7627c79db971 2478 for (sb = 2; sb < sblimit; ++sb, l += 18) {
Gruenfrosch 0:7627c79db971 2479 III_imdct_l(&xr[ch][l], output, channel->block_type);
Gruenfrosch 2:f28cf0afd021 2480 III_overlap(output, (frame->overlap)[ch][sb], sample, sb);
Gruenfrosch 0:7627c79db971 2481
Gruenfrosch 0:7627c79db971 2482 if (sb & 1)
Gruenfrosch 0:7627c79db971 2483 III_freqinver(sample, sb);
Gruenfrosch 0:7627c79db971 2484 }
Gruenfrosch 0:7627c79db971 2485 }
Gruenfrosch 0:7627c79db971 2486 else {
Gruenfrosch 0:7627c79db971 2487 /* short blocks */
Gruenfrosch 0:7627c79db971 2488 for (sb = 2; sb < sblimit; ++sb, l += 18) {
Gruenfrosch 0:7627c79db971 2489 III_imdct_s(&xr[ch][l], output);
Gruenfrosch 2:f28cf0afd021 2490 III_overlap(output, (frame->overlap)[ch][sb], sample, sb);
Gruenfrosch 0:7627c79db971 2491
Gruenfrosch 0:7627c79db971 2492 if (sb & 1)
Gruenfrosch 0:7627c79db971 2493 III_freqinver(sample, sb);
Gruenfrosch 0:7627c79db971 2494 }
Gruenfrosch 0:7627c79db971 2495 }
Gruenfrosch 0:7627c79db971 2496
Gruenfrosch 0:7627c79db971 2497 /* remaining (zero) subbands */
Gruenfrosch 0:7627c79db971 2498
Gruenfrosch 0:7627c79db971 2499 for (sb = sblimit; sb < 32; ++sb) {
Gruenfrosch 2:f28cf0afd021 2500 III_overlap_z((frame->overlap)[ch][sb], sample, sb);
Gruenfrosch 0:7627c79db971 2501
Gruenfrosch 0:7627c79db971 2502 if (sb & 1)
Gruenfrosch 0:7627c79db971 2503 III_freqinver(sample, sb);
Gruenfrosch 0:7627c79db971 2504 }
Gruenfrosch 0:7627c79db971 2505 }
Gruenfrosch 0:7627c79db971 2506 }
Gruenfrosch 0:7627c79db971 2507
Gruenfrosch 0:7627c79db971 2508 return MAD_ERROR_NONE;
Gruenfrosch 0:7627c79db971 2509 }
Gruenfrosch 0:7627c79db971 2510
Gruenfrosch 0:7627c79db971 2511 /*
Gruenfrosch 0:7627c79db971 2512 * NAME: layer->III()
Gruenfrosch 0:7627c79db971 2513 * DESCRIPTION: decode a single Layer III frame
Gruenfrosch 0:7627c79db971 2514 */
Gruenfrosch 0:7627c79db971 2515 int mad_layer_III(struct mad_stream *stream, struct mad_frame *frame)
Gruenfrosch 0:7627c79db971 2516 {
Gruenfrosch 0:7627c79db971 2517 struct mad_header *header = &frame->header;
Gruenfrosch 0:7627c79db971 2518 unsigned int nch, priv_bitlen, next_md_begin = 0;
Gruenfrosch 0:7627c79db971 2519 unsigned int si_len, data_bitlen, md_len;
Gruenfrosch 0:7627c79db971 2520 unsigned int frame_space, frame_used, frame_free;
Gruenfrosch 0:7627c79db971 2521 struct mad_bitptr ptr;
Gruenfrosch 0:7627c79db971 2522 struct sideinfo si;
Gruenfrosch 0:7627c79db971 2523 enum mad_error error;
Gruenfrosch 0:7627c79db971 2524 int result = 0;
Gruenfrosch 0:7627c79db971 2525
Gruenfrosch 0:7627c79db971 2526 /* allocate Layer III dynamic structures */
Gruenfrosch 0:7627c79db971 2527
Gruenfrosch 0:7627c79db971 2528 if (stream->main_data == 0) {
Gruenfrosch 2:f28cf0afd021 2529 #if defined(TARGET_LPC1768)
Gruenfrosch 2:f28cf0afd021 2530 stream->main_data = (unsigned char (*)[MAD_BUFFER_MDLEN])mad_malloc(MAD_BUFFER_MDLEN);
Gruenfrosch 2:f28cf0afd021 2531 #else
Gruenfrosch 0:7627c79db971 2532 stream->main_data = (unsigned char (*)[MAD_BUFFER_MDLEN])malloc(MAD_BUFFER_MDLEN);
Gruenfrosch 2:f28cf0afd021 2533 #endif
Gruenfrosch 0:7627c79db971 2534 if (stream->main_data == 0) {
Gruenfrosch 0:7627c79db971 2535 stream->error = MAD_ERROR_NOMEM;
Gruenfrosch 0:7627c79db971 2536 return -1;
Gruenfrosch 0:7627c79db971 2537 }
Gruenfrosch 0:7627c79db971 2538 }
Gruenfrosch 0:7627c79db971 2539
Gruenfrosch 0:7627c79db971 2540 nch = MAD_NCHANNELS(header);
Gruenfrosch 0:7627c79db971 2541 si_len = (header->flags & MAD_FLAG_LSF_EXT) ?
Gruenfrosch 0:7627c79db971 2542 (nch == 1 ? 9 : 17) : (nch == 1 ? 17 : 32);
Gruenfrosch 0:7627c79db971 2543
Gruenfrosch 0:7627c79db971 2544 /* check frame sanity */
Gruenfrosch 0:7627c79db971 2545
Gruenfrosch 0:7627c79db971 2546 if (stream->next_frame - mad_bit_nextbyte(&stream->ptr) <
Gruenfrosch 0:7627c79db971 2547 (signed int) si_len) {
Gruenfrosch 0:7627c79db971 2548 stream->error = MAD_ERROR_BADFRAMELEN;
Gruenfrosch 0:7627c79db971 2549 stream->md_len = 0;
Gruenfrosch 0:7627c79db971 2550 return -1;
Gruenfrosch 0:7627c79db971 2551 }
Gruenfrosch 0:7627c79db971 2552
Gruenfrosch 0:7627c79db971 2553 /* check CRC word */
Gruenfrosch 0:7627c79db971 2554
Gruenfrosch 0:7627c79db971 2555 if (header->flags & MAD_FLAG_PROTECTION) {
Gruenfrosch 0:7627c79db971 2556 header->crc_check =
Gruenfrosch 0:7627c79db971 2557 mad_bit_crc(stream->ptr, si_len * CHAR_BIT, header->crc_check);
Gruenfrosch 0:7627c79db971 2558
Gruenfrosch 0:7627c79db971 2559 if (header->crc_check != header->crc_target &&
Gruenfrosch 0:7627c79db971 2560 !(frame->options & MAD_OPTION_IGNORECRC)) {
Gruenfrosch 0:7627c79db971 2561 stream->error = MAD_ERROR_BADCRC;
Gruenfrosch 0:7627c79db971 2562 result = -1;
Gruenfrosch 0:7627c79db971 2563 }
Gruenfrosch 0:7627c79db971 2564 }
Gruenfrosch 0:7627c79db971 2565
Gruenfrosch 0:7627c79db971 2566 /* decode frame side information */
Gruenfrosch 0:7627c79db971 2567
Gruenfrosch 0:7627c79db971 2568 error = III_sideinfo(&stream->ptr, nch, header->flags & MAD_FLAG_LSF_EXT,
Gruenfrosch 0:7627c79db971 2569 &si, &data_bitlen, &priv_bitlen);
Gruenfrosch 0:7627c79db971 2570 if (error && result == 0) {
Gruenfrosch 0:7627c79db971 2571 stream->error = error;
Gruenfrosch 0:7627c79db971 2572 result = -1;
Gruenfrosch 0:7627c79db971 2573 }
Gruenfrosch 0:7627c79db971 2574
Gruenfrosch 0:7627c79db971 2575 header->flags |= priv_bitlen;
Gruenfrosch 0:7627c79db971 2576 header->private_bits |= si.private_bits;
Gruenfrosch 0:7627c79db971 2577
Gruenfrosch 0:7627c79db971 2578 /* find main_data of next frame */
Gruenfrosch 0:7627c79db971 2579
Gruenfrosch 0:7627c79db971 2580 {
Gruenfrosch 0:7627c79db971 2581 struct mad_bitptr peek;
Gruenfrosch 0:7627c79db971 2582 unsigned long header;
Gruenfrosch 0:7627c79db971 2583
Gruenfrosch 0:7627c79db971 2584 mad_bit_init(&peek, stream->next_frame);
Gruenfrosch 0:7627c79db971 2585
Gruenfrosch 0:7627c79db971 2586 header = mad_bit_read(&peek, 32);
Gruenfrosch 0:7627c79db971 2587 if ((header & 0xffe60000L) /* syncword | layer */ == 0xffe20000L) {
Gruenfrosch 0:7627c79db971 2588 if (!(header & 0x00010000L)) /* protection_bit */
Gruenfrosch 0:7627c79db971 2589 mad_bit_skip(&peek, 16); /* crc_check */
Gruenfrosch 0:7627c79db971 2590
Gruenfrosch 0:7627c79db971 2591 next_md_begin =
Gruenfrosch 0:7627c79db971 2592 mad_bit_read(&peek, (header & 0x00080000L) /* ID */ ? 9 : 8);
Gruenfrosch 0:7627c79db971 2593 }
Gruenfrosch 0:7627c79db971 2594
Gruenfrosch 0:7627c79db971 2595 mad_bit_finish(&peek);
Gruenfrosch 0:7627c79db971 2596 }
Gruenfrosch 0:7627c79db971 2597
Gruenfrosch 0:7627c79db971 2598 /* find main_data of this frame */
Gruenfrosch 0:7627c79db971 2599
Gruenfrosch 0:7627c79db971 2600 frame_space = stream->next_frame - mad_bit_nextbyte(&stream->ptr);
Gruenfrosch 0:7627c79db971 2601
Gruenfrosch 0:7627c79db971 2602 if (next_md_begin > si.main_data_begin + frame_space)
Gruenfrosch 0:7627c79db971 2603 next_md_begin = 0;
Gruenfrosch 0:7627c79db971 2604
Gruenfrosch 0:7627c79db971 2605 md_len = si.main_data_begin + frame_space - next_md_begin;
Gruenfrosch 0:7627c79db971 2606
Gruenfrosch 0:7627c79db971 2607 frame_used = 0;
Gruenfrosch 0:7627c79db971 2608
Gruenfrosch 0:7627c79db971 2609 if (si.main_data_begin == 0) {
Gruenfrosch 0:7627c79db971 2610 ptr = stream->ptr;
Gruenfrosch 0:7627c79db971 2611 stream->md_len = 0;
Gruenfrosch 0:7627c79db971 2612
Gruenfrosch 0:7627c79db971 2613 frame_used = md_len;
Gruenfrosch 0:7627c79db971 2614 }
Gruenfrosch 0:7627c79db971 2615 else {
Gruenfrosch 0:7627c79db971 2616 if (si.main_data_begin > stream->md_len) {
Gruenfrosch 0:7627c79db971 2617 if (result == 0) {
Gruenfrosch 0:7627c79db971 2618 stream->error = MAD_ERROR_BADDATAPTR;
Gruenfrosch 0:7627c79db971 2619 result = -1;
Gruenfrosch 0:7627c79db971 2620 }
Gruenfrosch 0:7627c79db971 2621 }
Gruenfrosch 0:7627c79db971 2622 else {
Gruenfrosch 0:7627c79db971 2623 mad_bit_init(&ptr,
Gruenfrosch 0:7627c79db971 2624 *stream->main_data + stream->md_len - si.main_data_begin);
Gruenfrosch 0:7627c79db971 2625
Gruenfrosch 0:7627c79db971 2626 if (md_len > si.main_data_begin) {
Gruenfrosch 2:f28cf0afd021 2627 /*assert(stream->md_len + md_len -si.main_data_begin <= MAD_BUFFER_MDLEN); */
Gruenfrosch 0:7627c79db971 2628
Gruenfrosch 0:7627c79db971 2629 memcpy(*stream->main_data + stream->md_len,
Gruenfrosch 0:7627c79db971 2630 mad_bit_nextbyte(&stream->ptr),
Gruenfrosch 0:7627c79db971 2631 frame_used = md_len - si.main_data_begin);
Gruenfrosch 0:7627c79db971 2632 stream->md_len += frame_used;
Gruenfrosch 0:7627c79db971 2633 }
Gruenfrosch 0:7627c79db971 2634 }
Gruenfrosch 0:7627c79db971 2635 }
Gruenfrosch 0:7627c79db971 2636
Gruenfrosch 0:7627c79db971 2637 frame_free = frame_space - frame_used;
Gruenfrosch 0:7627c79db971 2638
Gruenfrosch 0:7627c79db971 2639 /* decode main_data */
Gruenfrosch 0:7627c79db971 2640
Gruenfrosch 0:7627c79db971 2641 if (result == 0) {
Gruenfrosch 0:7627c79db971 2642 error = III_decode(&ptr, frame, &si, nch);
Gruenfrosch 0:7627c79db971 2643 if (error) {
Gruenfrosch 0:7627c79db971 2644 stream->error = error;
Gruenfrosch 0:7627c79db971 2645 result = -1;
Gruenfrosch 0:7627c79db971 2646 }
Gruenfrosch 0:7627c79db971 2647
Gruenfrosch 0:7627c79db971 2648 /* designate ancillary bits */
Gruenfrosch 0:7627c79db971 2649
Gruenfrosch 0:7627c79db971 2650 stream->anc_ptr = ptr;
Gruenfrosch 0:7627c79db971 2651 stream->anc_bitlen = md_len * CHAR_BIT - data_bitlen;
Gruenfrosch 0:7627c79db971 2652 }
Gruenfrosch 0:7627c79db971 2653
Gruenfrosch 0:7627c79db971 2654 # if 0 && defined(DEBUG)
Gruenfrosch 0:7627c79db971 2655 fprintf(stderr,
Gruenfrosch 0:7627c79db971 2656 "main_data_begin:%u, md_len:%u, frame_free:%u, "
Gruenfrosch 0:7627c79db971 2657 "data_bitlen:%u, anc_bitlen: %u\n",
Gruenfrosch 0:7627c79db971 2658 si.main_data_begin, md_len, frame_free,
Gruenfrosch 0:7627c79db971 2659 data_bitlen, stream->anc_bitlen);
Gruenfrosch 0:7627c79db971 2660 # endif
Gruenfrosch 0:7627c79db971 2661
Gruenfrosch 0:7627c79db971 2662 /* preload main_data buffer with up to 511 bytes for next frame(s) */
Gruenfrosch 0:7627c79db971 2663
Gruenfrosch 0:7627c79db971 2664 if (frame_free >= next_md_begin) {
Gruenfrosch 0:7627c79db971 2665 memcpy(*stream->main_data,
Gruenfrosch 0:7627c79db971 2666 stream->next_frame - next_md_begin, next_md_begin);
Gruenfrosch 0:7627c79db971 2667 stream->md_len = next_md_begin;
Gruenfrosch 0:7627c79db971 2668 }
Gruenfrosch 0:7627c79db971 2669 else {
Gruenfrosch 0:7627c79db971 2670 if (md_len < si.main_data_begin) {
Gruenfrosch 0:7627c79db971 2671 unsigned int extra;
Gruenfrosch 0:7627c79db971 2672
Gruenfrosch 0:7627c79db971 2673 extra = si.main_data_begin - md_len;
Gruenfrosch 0:7627c79db971 2674 if (extra + frame_free > next_md_begin)
Gruenfrosch 0:7627c79db971 2675 extra = next_md_begin - frame_free;
Gruenfrosch 0:7627c79db971 2676
Gruenfrosch 0:7627c79db971 2677 if (extra < stream->md_len) {
Gruenfrosch 0:7627c79db971 2678 memmove(*stream->main_data,
Gruenfrosch 0:7627c79db971 2679 *stream->main_data + stream->md_len - extra, extra);
Gruenfrosch 0:7627c79db971 2680 stream->md_len = extra;
Gruenfrosch 0:7627c79db971 2681 }
Gruenfrosch 0:7627c79db971 2682 }
Gruenfrosch 0:7627c79db971 2683 else
Gruenfrosch 0:7627c79db971 2684 stream->md_len = 0;
Gruenfrosch 0:7627c79db971 2685
Gruenfrosch 0:7627c79db971 2686 memcpy(*stream->main_data + stream->md_len,
Gruenfrosch 0:7627c79db971 2687 stream->next_frame - frame_free, frame_free);
Gruenfrosch 0:7627c79db971 2688 stream->md_len += frame_free;
Gruenfrosch 0:7627c79db971 2689 }
Gruenfrosch 0:7627c79db971 2690
Gruenfrosch 0:7627c79db971 2691 return result;
Gruenfrosch 0:7627c79db971 2692 }