streo mp3 player see: http://mbed.org/users/okini3939/notebook/I2S_AUDIO
Dependencies: FatFileSystemCpp I2SSlave TLV320 mbed
Fork of madplayer by
stream.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?
User | Revision | Line number | New 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: stream.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 | |
Gruenfrosch | 0:7627c79db971 | 28 | # include "bit.h" |
Gruenfrosch | 0:7627c79db971 | 29 | # include "stream.h" |
Gruenfrosch | 0:7627c79db971 | 30 | |
Gruenfrosch | 0:7627c79db971 | 31 | /* |
Gruenfrosch | 0:7627c79db971 | 32 | * NAME: stream->init() |
Gruenfrosch | 0:7627c79db971 | 33 | * DESCRIPTION: initialize stream struct |
Gruenfrosch | 0:7627c79db971 | 34 | */ |
Gruenfrosch | 0:7627c79db971 | 35 | void mad_stream_init(struct mad_stream *stream) |
Gruenfrosch | 0:7627c79db971 | 36 | { |
Gruenfrosch | 0:7627c79db971 | 37 | stream->buffer = 0; |
Gruenfrosch | 0:7627c79db971 | 38 | stream->bufend = 0; |
Gruenfrosch | 0:7627c79db971 | 39 | stream->skiplen = 0; |
Gruenfrosch | 0:7627c79db971 | 40 | |
Gruenfrosch | 0:7627c79db971 | 41 | stream->sync = 0; |
Gruenfrosch | 0:7627c79db971 | 42 | stream->freerate = 0; |
Gruenfrosch | 0:7627c79db971 | 43 | |
Gruenfrosch | 0:7627c79db971 | 44 | stream->this_frame = 0; |
Gruenfrosch | 0:7627c79db971 | 45 | stream->next_frame = 0; |
Gruenfrosch | 0:7627c79db971 | 46 | mad_bit_init(&stream->ptr, 0); |
Gruenfrosch | 0:7627c79db971 | 47 | |
Gruenfrosch | 0:7627c79db971 | 48 | mad_bit_init(&stream->anc_ptr, 0); |
Gruenfrosch | 0:7627c79db971 | 49 | stream->anc_bitlen = 0; |
Gruenfrosch | 0:7627c79db971 | 50 | |
Gruenfrosch | 0:7627c79db971 | 51 | stream->main_data = 0; |
Gruenfrosch | 0:7627c79db971 | 52 | stream->md_len = 0; |
Gruenfrosch | 0:7627c79db971 | 53 | |
Gruenfrosch | 0:7627c79db971 | 54 | stream->options = 0; |
Gruenfrosch | 0:7627c79db971 | 55 | stream->error = MAD_ERROR_NONE; |
Gruenfrosch | 0:7627c79db971 | 56 | } |
Gruenfrosch | 0:7627c79db971 | 57 | |
Gruenfrosch | 0:7627c79db971 | 58 | /* |
Gruenfrosch | 0:7627c79db971 | 59 | * NAME: stream->finish() |
Gruenfrosch | 0:7627c79db971 | 60 | * DESCRIPTION: deallocate any dynamic memory associated with stream |
Gruenfrosch | 0:7627c79db971 | 61 | */ |
Gruenfrosch | 0:7627c79db971 | 62 | void mad_stream_finish(struct mad_stream *stream) |
Gruenfrosch | 0:7627c79db971 | 63 | { |
Gruenfrosch | 0:7627c79db971 | 64 | if (stream->main_data) { |
Gruenfrosch | 2:f28cf0afd021 | 65 | #if !defined(TARGET_LPC1768) |
Gruenfrosch | 0:7627c79db971 | 66 | free(stream->main_data); |
Gruenfrosch | 2:f28cf0afd021 | 67 | #endif |
Gruenfrosch | 0:7627c79db971 | 68 | stream->main_data = 0; |
Gruenfrosch | 0:7627c79db971 | 69 | } |
Gruenfrosch | 0:7627c79db971 | 70 | |
Gruenfrosch | 0:7627c79db971 | 71 | mad_bit_finish(&stream->anc_ptr); |
Gruenfrosch | 0:7627c79db971 | 72 | mad_bit_finish(&stream->ptr); |
Gruenfrosch | 0:7627c79db971 | 73 | } |
Gruenfrosch | 0:7627c79db971 | 74 | |
Gruenfrosch | 0:7627c79db971 | 75 | /* |
Gruenfrosch | 0:7627c79db971 | 76 | * NAME: stream->buffer() |
Gruenfrosch | 0:7627c79db971 | 77 | * DESCRIPTION: set stream buffer pointers |
Gruenfrosch | 0:7627c79db971 | 78 | */ |
Gruenfrosch | 0:7627c79db971 | 79 | void mad_stream_buffer(struct mad_stream *stream, |
Gruenfrosch | 0:7627c79db971 | 80 | unsigned char const *buffer, unsigned long length) |
Gruenfrosch | 0:7627c79db971 | 81 | { |
Gruenfrosch | 0:7627c79db971 | 82 | stream->buffer = buffer; |
Gruenfrosch | 0:7627c79db971 | 83 | stream->bufend = buffer + length; |
Gruenfrosch | 0:7627c79db971 | 84 | |
Gruenfrosch | 0:7627c79db971 | 85 | stream->this_frame = buffer; |
Gruenfrosch | 0:7627c79db971 | 86 | stream->next_frame = buffer; |
Gruenfrosch | 0:7627c79db971 | 87 | |
Gruenfrosch | 0:7627c79db971 | 88 | stream->sync = 1; |
Gruenfrosch | 0:7627c79db971 | 89 | |
Gruenfrosch | 0:7627c79db971 | 90 | mad_bit_init(&stream->ptr, buffer); |
Gruenfrosch | 0:7627c79db971 | 91 | } |
Gruenfrosch | 0:7627c79db971 | 92 | |
Gruenfrosch | 0:7627c79db971 | 93 | /* |
Gruenfrosch | 0:7627c79db971 | 94 | * NAME: stream->skip() |
Gruenfrosch | 0:7627c79db971 | 95 | * DESCRIPTION: arrange to skip bytes before the next frame |
Gruenfrosch | 0:7627c79db971 | 96 | */ |
Gruenfrosch | 0:7627c79db971 | 97 | void mad_stream_skip(struct mad_stream *stream, unsigned long length) |
Gruenfrosch | 0:7627c79db971 | 98 | { |
Gruenfrosch | 0:7627c79db971 | 99 | stream->skiplen += length; |
Gruenfrosch | 0:7627c79db971 | 100 | } |
Gruenfrosch | 0:7627c79db971 | 101 | |
Gruenfrosch | 0:7627c79db971 | 102 | /* |
Gruenfrosch | 0:7627c79db971 | 103 | * NAME: stream->sync() |
Gruenfrosch | 0:7627c79db971 | 104 | * DESCRIPTION: locate the next stream sync word |
Gruenfrosch | 0:7627c79db971 | 105 | */ |
Gruenfrosch | 0:7627c79db971 | 106 | int mad_stream_sync(struct mad_stream *stream) |
Gruenfrosch | 0:7627c79db971 | 107 | { |
Gruenfrosch | 0:7627c79db971 | 108 | register unsigned char const *ptr, *end; |
Gruenfrosch | 0:7627c79db971 | 109 | |
Gruenfrosch | 0:7627c79db971 | 110 | ptr = mad_bit_nextbyte(&stream->ptr); |
Gruenfrosch | 0:7627c79db971 | 111 | end = stream->bufend; |
Gruenfrosch | 0:7627c79db971 | 112 | |
Gruenfrosch | 0:7627c79db971 | 113 | while (ptr < end - 1 && |
Gruenfrosch | 0:7627c79db971 | 114 | !(ptr[0] == 0xff && (ptr[1] & 0xe0) == 0xe0)) |
Gruenfrosch | 0:7627c79db971 | 115 | ++ptr; |
Gruenfrosch | 0:7627c79db971 | 116 | |
Gruenfrosch | 0:7627c79db971 | 117 | if (end - ptr < MAD_BUFFER_GUARD) |
Gruenfrosch | 0:7627c79db971 | 118 | return -1; |
Gruenfrosch | 0:7627c79db971 | 119 | |
Gruenfrosch | 0:7627c79db971 | 120 | mad_bit_init(&stream->ptr, ptr); |
Gruenfrosch | 0:7627c79db971 | 121 | |
Gruenfrosch | 0:7627c79db971 | 122 | return 0; |
Gruenfrosch | 0:7627c79db971 | 123 | } |
Gruenfrosch | 0:7627c79db971 | 124 | |
Gruenfrosch | 0:7627c79db971 | 125 | /* |
Gruenfrosch | 0:7627c79db971 | 126 | * NAME: stream->errorstr() |
Gruenfrosch | 0:7627c79db971 | 127 | * DESCRIPTION: return a string description of the current error condition |
Gruenfrosch | 0:7627c79db971 | 128 | */ |
Gruenfrosch | 0:7627c79db971 | 129 | char const *mad_stream_errorstr(struct mad_stream const *stream) |
Gruenfrosch | 0:7627c79db971 | 130 | { |
Gruenfrosch | 0:7627c79db971 | 131 | switch (stream->error) { |
Gruenfrosch | 0:7627c79db971 | 132 | case MAD_ERROR_NONE: return "no error"; |
Gruenfrosch | 0:7627c79db971 | 133 | |
Gruenfrosch | 0:7627c79db971 | 134 | case MAD_ERROR_BUFLEN: return "input buffer too small (or EOF)"; |
Gruenfrosch | 0:7627c79db971 | 135 | case MAD_ERROR_BUFPTR: return "invalid (null) buffer pointer"; |
Gruenfrosch | 0:7627c79db971 | 136 | |
Gruenfrosch | 0:7627c79db971 | 137 | case MAD_ERROR_NOMEM: return "not enough memory"; |
Gruenfrosch | 0:7627c79db971 | 138 | |
Gruenfrosch | 0:7627c79db971 | 139 | case MAD_ERROR_LOSTSYNC: return "lost synchronization"; |
Gruenfrosch | 0:7627c79db971 | 140 | case MAD_ERROR_BADLAYER: return "reserved header layer value"; |
Gruenfrosch | 0:7627c79db971 | 141 | case MAD_ERROR_BADBITRATE: return "forbidden bitrate value"; |
Gruenfrosch | 0:7627c79db971 | 142 | case MAD_ERROR_BADSAMPLERATE: return "reserved sample frequency value"; |
Gruenfrosch | 0:7627c79db971 | 143 | case MAD_ERROR_BADEMPHASIS: return "reserved emphasis value"; |
Gruenfrosch | 0:7627c79db971 | 144 | |
Gruenfrosch | 0:7627c79db971 | 145 | case MAD_ERROR_BADCRC: return "CRC check failed"; |
Gruenfrosch | 0:7627c79db971 | 146 | case MAD_ERROR_BADBITALLOC: return "forbidden bit allocation value"; |
Gruenfrosch | 0:7627c79db971 | 147 | case MAD_ERROR_BADSCALEFACTOR: return "bad scalefactor index"; |
Gruenfrosch | 0:7627c79db971 | 148 | case MAD_ERROR_BADMODE: return "bad bitrate/mode combination"; |
Gruenfrosch | 0:7627c79db971 | 149 | case MAD_ERROR_BADFRAMELEN: return "bad frame length"; |
Gruenfrosch | 0:7627c79db971 | 150 | case MAD_ERROR_BADBIGVALUES: return "bad big_values count"; |
Gruenfrosch | 0:7627c79db971 | 151 | case MAD_ERROR_BADBLOCKTYPE: return "reserved block_type"; |
Gruenfrosch | 0:7627c79db971 | 152 | case MAD_ERROR_BADSCFSI: return "bad scalefactor selection info"; |
Gruenfrosch | 0:7627c79db971 | 153 | case MAD_ERROR_BADDATAPTR: return "bad main_data_begin pointer"; |
Gruenfrosch | 0:7627c79db971 | 154 | case MAD_ERROR_BADPART3LEN: return "bad audio data length"; |
Gruenfrosch | 0:7627c79db971 | 155 | case MAD_ERROR_BADHUFFTABLE: return "bad Huffman table select"; |
Gruenfrosch | 0:7627c79db971 | 156 | case MAD_ERROR_BADHUFFDATA: return "Huffman data overrun"; |
Gruenfrosch | 0:7627c79db971 | 157 | case MAD_ERROR_BADSTEREO: return "incompatible block_type for JS"; |
Gruenfrosch | 0:7627c79db971 | 158 | } |
Gruenfrosch | 0:7627c79db971 | 159 | |
Gruenfrosch | 0:7627c79db971 | 160 | return 0; |
Gruenfrosch | 0:7627c79db971 | 161 | } |