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

bit.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: bit.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 # ifdef HAVE_LIMITS_H
Gruenfrosch 0:7627c79db971 27 # include <limits.h>
Gruenfrosch 0:7627c79db971 28 # else
Gruenfrosch 0:7627c79db971 29 # define CHAR_BIT 8
Gruenfrosch 0:7627c79db971 30 # endif
Gruenfrosch 0:7627c79db971 31
Gruenfrosch 0:7627c79db971 32 # include "bit.h"
Gruenfrosch 0:7627c79db971 33
Gruenfrosch 0:7627c79db971 34 /*
Gruenfrosch 0:7627c79db971 35 * This is the lookup table for computing the CRC-check word.
Gruenfrosch 0:7627c79db971 36 * As described in section 2.4.3.1 and depicted in Figure A.9
Gruenfrosch 0:7627c79db971 37 * of ISO/IEC 11172-3, the generator polynomial is:
Gruenfrosch 0:7627c79db971 38 *
Gruenfrosch 0:7627c79db971 39 * G(X) = X^16 + X^15 + X^2 + 1
Gruenfrosch 0:7627c79db971 40 */
Gruenfrosch 0:7627c79db971 41 static
Gruenfrosch 0:7627c79db971 42 unsigned short const crc_table[256] = {
Gruenfrosch 0:7627c79db971 43 0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011,
Gruenfrosch 0:7627c79db971 44 0x8033, 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022,
Gruenfrosch 0:7627c79db971 45 0x8063, 0x0066, 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072,
Gruenfrosch 0:7627c79db971 46 0x0050, 0x8055, 0x805f, 0x005a, 0x804b, 0x004e, 0x0044, 0x8041,
Gruenfrosch 0:7627c79db971 47 0x80c3, 0x00c6, 0x00cc, 0x80c9, 0x00d8, 0x80dd, 0x80d7, 0x00d2,
Gruenfrosch 0:7627c79db971 48 0x00f0, 0x80f5, 0x80ff, 0x00fa, 0x80eb, 0x00ee, 0x00e4, 0x80e1,
Gruenfrosch 0:7627c79db971 49 0x00a0, 0x80a5, 0x80af, 0x00aa, 0x80bb, 0x00be, 0x00b4, 0x80b1,
Gruenfrosch 0:7627c79db971 50 0x8093, 0x0096, 0x009c, 0x8099, 0x0088, 0x808d, 0x8087, 0x0082,
Gruenfrosch 0:7627c79db971 51
Gruenfrosch 0:7627c79db971 52 0x8183, 0x0186, 0x018c, 0x8189, 0x0198, 0x819d, 0x8197, 0x0192,
Gruenfrosch 0:7627c79db971 53 0x01b0, 0x81b5, 0x81bf, 0x01ba, 0x81ab, 0x01ae, 0x01a4, 0x81a1,
Gruenfrosch 0:7627c79db971 54 0x01e0, 0x81e5, 0x81ef, 0x01ea, 0x81fb, 0x01fe, 0x01f4, 0x81f1,
Gruenfrosch 0:7627c79db971 55 0x81d3, 0x01d6, 0x01dc, 0x81d9, 0x01c8, 0x81cd, 0x81c7, 0x01c2,
Gruenfrosch 0:7627c79db971 56 0x0140, 0x8145, 0x814f, 0x014a, 0x815b, 0x015e, 0x0154, 0x8151,
Gruenfrosch 0:7627c79db971 57 0x8173, 0x0176, 0x017c, 0x8179, 0x0168, 0x816d, 0x8167, 0x0162,
Gruenfrosch 0:7627c79db971 58 0x8123, 0x0126, 0x012c, 0x8129, 0x0138, 0x813d, 0x8137, 0x0132,
Gruenfrosch 0:7627c79db971 59 0x0110, 0x8115, 0x811f, 0x011a, 0x810b, 0x010e, 0x0104, 0x8101,
Gruenfrosch 0:7627c79db971 60
Gruenfrosch 0:7627c79db971 61 0x8303, 0x0306, 0x030c, 0x8309, 0x0318, 0x831d, 0x8317, 0x0312,
Gruenfrosch 0:7627c79db971 62 0x0330, 0x8335, 0x833f, 0x033a, 0x832b, 0x032e, 0x0324, 0x8321,
Gruenfrosch 0:7627c79db971 63 0x0360, 0x8365, 0x836f, 0x036a, 0x837b, 0x037e, 0x0374, 0x8371,
Gruenfrosch 0:7627c79db971 64 0x8353, 0x0356, 0x035c, 0x8359, 0x0348, 0x834d, 0x8347, 0x0342,
Gruenfrosch 0:7627c79db971 65 0x03c0, 0x83c5, 0x83cf, 0x03ca, 0x83db, 0x03de, 0x03d4, 0x83d1,
Gruenfrosch 0:7627c79db971 66 0x83f3, 0x03f6, 0x03fc, 0x83f9, 0x03e8, 0x83ed, 0x83e7, 0x03e2,
Gruenfrosch 0:7627c79db971 67 0x83a3, 0x03a6, 0x03ac, 0x83a9, 0x03b8, 0x83bd, 0x83b7, 0x03b2,
Gruenfrosch 0:7627c79db971 68 0x0390, 0x8395, 0x839f, 0x039a, 0x838b, 0x038e, 0x0384, 0x8381,
Gruenfrosch 0:7627c79db971 69
Gruenfrosch 0:7627c79db971 70 0x0280, 0x8285, 0x828f, 0x028a, 0x829b, 0x029e, 0x0294, 0x8291,
Gruenfrosch 0:7627c79db971 71 0x82b3, 0x02b6, 0x02bc, 0x82b9, 0x02a8, 0x82ad, 0x82a7, 0x02a2,
Gruenfrosch 0:7627c79db971 72 0x82e3, 0x02e6, 0x02ec, 0x82e9, 0x02f8, 0x82fd, 0x82f7, 0x02f2,
Gruenfrosch 0:7627c79db971 73 0x02d0, 0x82d5, 0x82df, 0x02da, 0x82cb, 0x02ce, 0x02c4, 0x82c1,
Gruenfrosch 0:7627c79db971 74 0x8243, 0x0246, 0x024c, 0x8249, 0x0258, 0x825d, 0x8257, 0x0252,
Gruenfrosch 0:7627c79db971 75 0x0270, 0x8275, 0x827f, 0x027a, 0x826b, 0x026e, 0x0264, 0x8261,
Gruenfrosch 0:7627c79db971 76 0x0220, 0x8225, 0x822f, 0x022a, 0x823b, 0x023e, 0x0234, 0x8231,
Gruenfrosch 0:7627c79db971 77 0x8213, 0x0216, 0x021c, 0x8219, 0x0208, 0x820d, 0x8207, 0x0202
Gruenfrosch 0:7627c79db971 78 };
Gruenfrosch 0:7627c79db971 79
Gruenfrosch 0:7627c79db971 80 # define CRC_POLY 0x8005
Gruenfrosch 0:7627c79db971 81
Gruenfrosch 0:7627c79db971 82 /*
Gruenfrosch 0:7627c79db971 83 * NAME: bit->init()
Gruenfrosch 0:7627c79db971 84 * DESCRIPTION: initialize bit pointer struct
Gruenfrosch 0:7627c79db971 85 */
Gruenfrosch 0:7627c79db971 86 void mad_bit_init(struct mad_bitptr *bitptr, unsigned char const *byte)
Gruenfrosch 0:7627c79db971 87 {
Gruenfrosch 0:7627c79db971 88 bitptr->byte = byte;
Gruenfrosch 0:7627c79db971 89 bitptr->cache = 0;
Gruenfrosch 0:7627c79db971 90 bitptr->left = CHAR_BIT;
Gruenfrosch 0:7627c79db971 91 }
Gruenfrosch 0:7627c79db971 92
Gruenfrosch 0:7627c79db971 93 /*
Gruenfrosch 0:7627c79db971 94 * NAME: bit->length()
Gruenfrosch 0:7627c79db971 95 * DESCRIPTION: return number of bits between start and end points
Gruenfrosch 0:7627c79db971 96 */
Gruenfrosch 0:7627c79db971 97 unsigned int mad_bit_length(struct mad_bitptr const *begin,
Gruenfrosch 0:7627c79db971 98 struct mad_bitptr const *end)
Gruenfrosch 0:7627c79db971 99 {
Gruenfrosch 0:7627c79db971 100 return begin->left +
Gruenfrosch 0:7627c79db971 101 CHAR_BIT * (end->byte - (begin->byte + 1)) + (CHAR_BIT - end->left);
Gruenfrosch 0:7627c79db971 102 }
Gruenfrosch 0:7627c79db971 103
Gruenfrosch 0:7627c79db971 104 /*
Gruenfrosch 0:7627c79db971 105 * NAME: bit->nextbyte()
Gruenfrosch 0:7627c79db971 106 * DESCRIPTION: return pointer to next unprocessed byte
Gruenfrosch 0:7627c79db971 107 */
Gruenfrosch 0:7627c79db971 108 unsigned char const *mad_bit_nextbyte(struct mad_bitptr const *bitptr)
Gruenfrosch 0:7627c79db971 109 {
Gruenfrosch 0:7627c79db971 110 return bitptr->left == CHAR_BIT ? bitptr->byte : bitptr->byte + 1;
Gruenfrosch 0:7627c79db971 111 }
Gruenfrosch 0:7627c79db971 112
Gruenfrosch 0:7627c79db971 113 /*
Gruenfrosch 0:7627c79db971 114 * NAME: bit->skip()
Gruenfrosch 0:7627c79db971 115 * DESCRIPTION: advance bit pointer
Gruenfrosch 0:7627c79db971 116 */
Gruenfrosch 0:7627c79db971 117 void mad_bit_skip(struct mad_bitptr *bitptr, unsigned int len)
Gruenfrosch 0:7627c79db971 118 {
Gruenfrosch 0:7627c79db971 119 bitptr->byte += len / CHAR_BIT;
Gruenfrosch 0:7627c79db971 120 bitptr->left -= len % CHAR_BIT;
Gruenfrosch 0:7627c79db971 121
Gruenfrosch 0:7627c79db971 122 if (bitptr->left > CHAR_BIT) {
Gruenfrosch 0:7627c79db971 123 bitptr->byte++;
Gruenfrosch 0:7627c79db971 124 bitptr->left += CHAR_BIT;
Gruenfrosch 0:7627c79db971 125 }
Gruenfrosch 0:7627c79db971 126
Gruenfrosch 0:7627c79db971 127 if (bitptr->left < CHAR_BIT)
Gruenfrosch 0:7627c79db971 128 bitptr->cache = *bitptr->byte;
Gruenfrosch 0:7627c79db971 129 }
Gruenfrosch 0:7627c79db971 130
Gruenfrosch 0:7627c79db971 131 /*
Gruenfrosch 0:7627c79db971 132 * NAME: bit->read()
Gruenfrosch 0:7627c79db971 133 * DESCRIPTION: read an arbitrary number of bits and return their UIMSBF value
Gruenfrosch 0:7627c79db971 134 */
Gruenfrosch 0:7627c79db971 135 unsigned long mad_bit_read(struct mad_bitptr *bitptr, unsigned int len)
Gruenfrosch 0:7627c79db971 136 {
Gruenfrosch 0:7627c79db971 137 register unsigned long value;
Gruenfrosch 0:7627c79db971 138
Gruenfrosch 0:7627c79db971 139 if (bitptr->left == CHAR_BIT)
Gruenfrosch 0:7627c79db971 140 bitptr->cache = *bitptr->byte;
Gruenfrosch 0:7627c79db971 141
Gruenfrosch 0:7627c79db971 142 if (len < bitptr->left) {
Gruenfrosch 0:7627c79db971 143 value = (bitptr->cache & ((1 << bitptr->left) - 1)) >>
Gruenfrosch 0:7627c79db971 144 (bitptr->left - len);
Gruenfrosch 0:7627c79db971 145 bitptr->left -= len;
Gruenfrosch 0:7627c79db971 146
Gruenfrosch 0:7627c79db971 147 return value;
Gruenfrosch 0:7627c79db971 148 }
Gruenfrosch 0:7627c79db971 149
Gruenfrosch 0:7627c79db971 150 /* remaining bits in current byte */
Gruenfrosch 0:7627c79db971 151
Gruenfrosch 0:7627c79db971 152 value = bitptr->cache & ((1 << bitptr->left) - 1);
Gruenfrosch 0:7627c79db971 153 len -= bitptr->left;
Gruenfrosch 0:7627c79db971 154
Gruenfrosch 0:7627c79db971 155 bitptr->byte++;
Gruenfrosch 0:7627c79db971 156 bitptr->left = CHAR_BIT;
Gruenfrosch 0:7627c79db971 157
Gruenfrosch 0:7627c79db971 158 /* more bytes */
Gruenfrosch 0:7627c79db971 159
Gruenfrosch 0:7627c79db971 160 while (len >= CHAR_BIT) {
Gruenfrosch 0:7627c79db971 161 value = (value << CHAR_BIT) | *bitptr->byte++;
Gruenfrosch 0:7627c79db971 162 len -= CHAR_BIT;
Gruenfrosch 0:7627c79db971 163 }
Gruenfrosch 0:7627c79db971 164
Gruenfrosch 0:7627c79db971 165 if (len > 0) {
Gruenfrosch 0:7627c79db971 166 bitptr->cache = *bitptr->byte;
Gruenfrosch 0:7627c79db971 167
Gruenfrosch 0:7627c79db971 168 value = (value << len) | (bitptr->cache >> (CHAR_BIT - len));
Gruenfrosch 0:7627c79db971 169 bitptr->left -= len;
Gruenfrosch 0:7627c79db971 170 }
Gruenfrosch 0:7627c79db971 171
Gruenfrosch 0:7627c79db971 172 return value;
Gruenfrosch 0:7627c79db971 173 }
Gruenfrosch 0:7627c79db971 174
Gruenfrosch 0:7627c79db971 175 # if 0
Gruenfrosch 0:7627c79db971 176 /*
Gruenfrosch 0:7627c79db971 177 * NAME: bit->write()
Gruenfrosch 0:7627c79db971 178 * DESCRIPTION: write an arbitrary number of bits
Gruenfrosch 0:7627c79db971 179 */
Gruenfrosch 0:7627c79db971 180 void mad_bit_write(struct mad_bitptr *bitptr, unsigned int len,
Gruenfrosch 0:7627c79db971 181 unsigned long value)
Gruenfrosch 0:7627c79db971 182 {
Gruenfrosch 0:7627c79db971 183 unsigned char *ptr;
Gruenfrosch 0:7627c79db971 184
Gruenfrosch 0:7627c79db971 185 ptr = (unsigned char *) bitptr->byte;
Gruenfrosch 0:7627c79db971 186
Gruenfrosch 0:7627c79db971 187 /* ... */
Gruenfrosch 0:7627c79db971 188 }
Gruenfrosch 0:7627c79db971 189 # endif
Gruenfrosch 0:7627c79db971 190
Gruenfrosch 0:7627c79db971 191 /*
Gruenfrosch 0:7627c79db971 192 * NAME: bit->crc()
Gruenfrosch 0:7627c79db971 193 * DESCRIPTION: compute CRC-check word
Gruenfrosch 0:7627c79db971 194 */
Gruenfrosch 0:7627c79db971 195 unsigned short mad_bit_crc(struct mad_bitptr bitptr, unsigned int len,
Gruenfrosch 0:7627c79db971 196 unsigned short init)
Gruenfrosch 0:7627c79db971 197 {
Gruenfrosch 0:7627c79db971 198 register unsigned int crc;
Gruenfrosch 0:7627c79db971 199
Gruenfrosch 0:7627c79db971 200 for (crc = init; len >= 32; len -= 32) {
Gruenfrosch 0:7627c79db971 201 register unsigned long data;
Gruenfrosch 0:7627c79db971 202
Gruenfrosch 0:7627c79db971 203 data = mad_bit_read(&bitptr, 32);
Gruenfrosch 0:7627c79db971 204
Gruenfrosch 0:7627c79db971 205 crc = (crc << 8) ^ crc_table[((crc >> 8) ^ (data >> 24)) & 0xff];
Gruenfrosch 0:7627c79db971 206 crc = (crc << 8) ^ crc_table[((crc >> 8) ^ (data >> 16)) & 0xff];
Gruenfrosch 0:7627c79db971 207 crc = (crc << 8) ^ crc_table[((crc >> 8) ^ (data >> 8)) & 0xff];
Gruenfrosch 0:7627c79db971 208 crc = (crc << 8) ^ crc_table[((crc >> 8) ^ (data >> 0)) & 0xff];
Gruenfrosch 0:7627c79db971 209 }
Gruenfrosch 0:7627c79db971 210
Gruenfrosch 0:7627c79db971 211 switch (len / 8) {
Gruenfrosch 0:7627c79db971 212 case 3: crc = (crc << 8) ^
Gruenfrosch 0:7627c79db971 213 crc_table[((crc >> 8) ^ mad_bit_read(&bitptr, 8)) & 0xff];
Gruenfrosch 0:7627c79db971 214 case 2: crc = (crc << 8) ^
Gruenfrosch 0:7627c79db971 215 crc_table[((crc >> 8) ^ mad_bit_read(&bitptr, 8)) & 0xff];
Gruenfrosch 0:7627c79db971 216 case 1: crc = (crc << 8) ^
Gruenfrosch 0:7627c79db971 217 crc_table[((crc >> 8) ^ mad_bit_read(&bitptr, 8)) & 0xff];
Gruenfrosch 0:7627c79db971 218
Gruenfrosch 0:7627c79db971 219 len %= 8;
Gruenfrosch 0:7627c79db971 220
Gruenfrosch 0:7627c79db971 221 case 0: break;
Gruenfrosch 0:7627c79db971 222 }
Gruenfrosch 0:7627c79db971 223
Gruenfrosch 0:7627c79db971 224 while (len--) {
Gruenfrosch 0:7627c79db971 225 register unsigned int msb;
Gruenfrosch 0:7627c79db971 226
Gruenfrosch 0:7627c79db971 227 msb = mad_bit_read(&bitptr, 1) ^ (crc >> 15);
Gruenfrosch 0:7627c79db971 228
Gruenfrosch 0:7627c79db971 229 crc <<= 1;
Gruenfrosch 0:7627c79db971 230 if (msb & 1)
Gruenfrosch 0:7627c79db971 231 crc ^= CRC_POLY;
Gruenfrosch 0:7627c79db971 232 }
Gruenfrosch 0:7627c79db971 233
Gruenfrosch 0:7627c79db971 234 return crc & 0xffff;
Gruenfrosch 0:7627c79db971 235 }