MP3 Player. You can change fwd/rev speed and skip. see: http://mbed.org/users/okini3939/notebook/lpc4088_madplayer/
Dependencies: I2SSlave SDFileSystem TLV320 mbed
madplayer/stream.cpp@0:8ba6230eefbd, 2014-02-18 (annotated)
- Committer:
- okini3939
- Date:
- Tue Feb 18 00:22:50 2014 +0000
- Revision:
- 0:8ba6230eefbd
1st build
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
okini3939 | 0:8ba6230eefbd | 1 | /* |
okini3939 | 0:8ba6230eefbd | 2 | * libmad - MPEG audio decoder library |
okini3939 | 0:8ba6230eefbd | 3 | * Copyright (C) 2000-2004 Underbit Technologies, Inc. |
okini3939 | 0:8ba6230eefbd | 4 | * |
okini3939 | 0:8ba6230eefbd | 5 | * This program is free software; you can redistribute it and/or modify |
okini3939 | 0:8ba6230eefbd | 6 | * it under the terms of the GNU General Public License as published by |
okini3939 | 0:8ba6230eefbd | 7 | * the Free Software Foundation; either version 2 of the License, or |
okini3939 | 0:8ba6230eefbd | 8 | * (at your option) any later version. |
okini3939 | 0:8ba6230eefbd | 9 | * |
okini3939 | 0:8ba6230eefbd | 10 | * This program is distributed in the hope that it will be useful, |
okini3939 | 0:8ba6230eefbd | 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
okini3939 | 0:8ba6230eefbd | 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
okini3939 | 0:8ba6230eefbd | 13 | * GNU General Public License for more details. |
okini3939 | 0:8ba6230eefbd | 14 | * |
okini3939 | 0:8ba6230eefbd | 15 | * You should have received a copy of the GNU General Public License |
okini3939 | 0:8ba6230eefbd | 16 | * along with this program; if not, write to the Free Software |
okini3939 | 0:8ba6230eefbd | 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
okini3939 | 0:8ba6230eefbd | 18 | * |
okini3939 | 0:8ba6230eefbd | 19 | * $Id: stream.c,v 1.1 2010/11/23 20:12:57 andy Exp $ |
okini3939 | 0:8ba6230eefbd | 20 | */ |
okini3939 | 0:8ba6230eefbd | 21 | |
okini3939 | 0:8ba6230eefbd | 22 | # include "config.h" |
okini3939 | 0:8ba6230eefbd | 23 | |
okini3939 | 0:8ba6230eefbd | 24 | # include "global.h" |
okini3939 | 0:8ba6230eefbd | 25 | |
okini3939 | 0:8ba6230eefbd | 26 | # include <stdlib.h> |
okini3939 | 0:8ba6230eefbd | 27 | |
okini3939 | 0:8ba6230eefbd | 28 | # include "bit.h" |
okini3939 | 0:8ba6230eefbd | 29 | # include "stream.h" |
okini3939 | 0:8ba6230eefbd | 30 | |
okini3939 | 0:8ba6230eefbd | 31 | /* |
okini3939 | 0:8ba6230eefbd | 32 | * NAME: stream->init() |
okini3939 | 0:8ba6230eefbd | 33 | * DESCRIPTION: initialize stream struct |
okini3939 | 0:8ba6230eefbd | 34 | */ |
okini3939 | 0:8ba6230eefbd | 35 | void mad_stream_init(struct mad_stream *stream) |
okini3939 | 0:8ba6230eefbd | 36 | { |
okini3939 | 0:8ba6230eefbd | 37 | stream->buffer = 0; |
okini3939 | 0:8ba6230eefbd | 38 | stream->bufend = 0; |
okini3939 | 0:8ba6230eefbd | 39 | stream->skiplen = 0; |
okini3939 | 0:8ba6230eefbd | 40 | |
okini3939 | 0:8ba6230eefbd | 41 | stream->sync = 0; |
okini3939 | 0:8ba6230eefbd | 42 | stream->freerate = 0; |
okini3939 | 0:8ba6230eefbd | 43 | |
okini3939 | 0:8ba6230eefbd | 44 | stream->this_frame = 0; |
okini3939 | 0:8ba6230eefbd | 45 | stream->next_frame = 0; |
okini3939 | 0:8ba6230eefbd | 46 | mad_bit_init(&stream->ptr, 0); |
okini3939 | 0:8ba6230eefbd | 47 | |
okini3939 | 0:8ba6230eefbd | 48 | mad_bit_init(&stream->anc_ptr, 0); |
okini3939 | 0:8ba6230eefbd | 49 | stream->anc_bitlen = 0; |
okini3939 | 0:8ba6230eefbd | 50 | |
okini3939 | 0:8ba6230eefbd | 51 | stream->main_data = 0; |
okini3939 | 0:8ba6230eefbd | 52 | stream->md_len = 0; |
okini3939 | 0:8ba6230eefbd | 53 | |
okini3939 | 0:8ba6230eefbd | 54 | stream->options = 0; |
okini3939 | 0:8ba6230eefbd | 55 | stream->error = MAD_ERROR_NONE; |
okini3939 | 0:8ba6230eefbd | 56 | } |
okini3939 | 0:8ba6230eefbd | 57 | |
okini3939 | 0:8ba6230eefbd | 58 | /* |
okini3939 | 0:8ba6230eefbd | 59 | * NAME: stream->finish() |
okini3939 | 0:8ba6230eefbd | 60 | * DESCRIPTION: deallocate any dynamic memory associated with stream |
okini3939 | 0:8ba6230eefbd | 61 | */ |
okini3939 | 0:8ba6230eefbd | 62 | void mad_stream_finish(struct mad_stream *stream) |
okini3939 | 0:8ba6230eefbd | 63 | { |
okini3939 | 0:8ba6230eefbd | 64 | if (stream->main_data) { |
okini3939 | 0:8ba6230eefbd | 65 | #if !defined(TARGET_LPC1768) |
okini3939 | 0:8ba6230eefbd | 66 | free(stream->main_data); |
okini3939 | 0:8ba6230eefbd | 67 | #endif |
okini3939 | 0:8ba6230eefbd | 68 | stream->main_data = 0; |
okini3939 | 0:8ba6230eefbd | 69 | } |
okini3939 | 0:8ba6230eefbd | 70 | |
okini3939 | 0:8ba6230eefbd | 71 | mad_bit_finish(&stream->anc_ptr); |
okini3939 | 0:8ba6230eefbd | 72 | mad_bit_finish(&stream->ptr); |
okini3939 | 0:8ba6230eefbd | 73 | } |
okini3939 | 0:8ba6230eefbd | 74 | |
okini3939 | 0:8ba6230eefbd | 75 | /* |
okini3939 | 0:8ba6230eefbd | 76 | * NAME: stream->buffer() |
okini3939 | 0:8ba6230eefbd | 77 | * DESCRIPTION: set stream buffer pointers |
okini3939 | 0:8ba6230eefbd | 78 | */ |
okini3939 | 0:8ba6230eefbd | 79 | void mad_stream_buffer(struct mad_stream *stream, |
okini3939 | 0:8ba6230eefbd | 80 | unsigned char const *buffer, unsigned long length) |
okini3939 | 0:8ba6230eefbd | 81 | { |
okini3939 | 0:8ba6230eefbd | 82 | stream->buffer = buffer; |
okini3939 | 0:8ba6230eefbd | 83 | stream->bufend = buffer + length; |
okini3939 | 0:8ba6230eefbd | 84 | |
okini3939 | 0:8ba6230eefbd | 85 | stream->this_frame = buffer; |
okini3939 | 0:8ba6230eefbd | 86 | stream->next_frame = buffer; |
okini3939 | 0:8ba6230eefbd | 87 | |
okini3939 | 0:8ba6230eefbd | 88 | stream->sync = 1; |
okini3939 | 0:8ba6230eefbd | 89 | |
okini3939 | 0:8ba6230eefbd | 90 | mad_bit_init(&stream->ptr, buffer); |
okini3939 | 0:8ba6230eefbd | 91 | } |
okini3939 | 0:8ba6230eefbd | 92 | |
okini3939 | 0:8ba6230eefbd | 93 | /* |
okini3939 | 0:8ba6230eefbd | 94 | * NAME: stream->skip() |
okini3939 | 0:8ba6230eefbd | 95 | * DESCRIPTION: arrange to skip bytes before the next frame |
okini3939 | 0:8ba6230eefbd | 96 | */ |
okini3939 | 0:8ba6230eefbd | 97 | void mad_stream_skip(struct mad_stream *stream, unsigned long length) |
okini3939 | 0:8ba6230eefbd | 98 | { |
okini3939 | 0:8ba6230eefbd | 99 | stream->skiplen += length; |
okini3939 | 0:8ba6230eefbd | 100 | } |
okini3939 | 0:8ba6230eefbd | 101 | |
okini3939 | 0:8ba6230eefbd | 102 | /* |
okini3939 | 0:8ba6230eefbd | 103 | * NAME: stream->sync() |
okini3939 | 0:8ba6230eefbd | 104 | * DESCRIPTION: locate the next stream sync word |
okini3939 | 0:8ba6230eefbd | 105 | */ |
okini3939 | 0:8ba6230eefbd | 106 | int mad_stream_sync(struct mad_stream *stream) |
okini3939 | 0:8ba6230eefbd | 107 | { |
okini3939 | 0:8ba6230eefbd | 108 | register unsigned char const *ptr, *end; |
okini3939 | 0:8ba6230eefbd | 109 | |
okini3939 | 0:8ba6230eefbd | 110 | ptr = mad_bit_nextbyte(&stream->ptr); |
okini3939 | 0:8ba6230eefbd | 111 | end = stream->bufend; |
okini3939 | 0:8ba6230eefbd | 112 | |
okini3939 | 0:8ba6230eefbd | 113 | while (ptr < end - 1 && |
okini3939 | 0:8ba6230eefbd | 114 | !(ptr[0] == 0xff && (ptr[1] & 0xe0) == 0xe0)) |
okini3939 | 0:8ba6230eefbd | 115 | ++ptr; |
okini3939 | 0:8ba6230eefbd | 116 | |
okini3939 | 0:8ba6230eefbd | 117 | if (end - ptr < MAD_BUFFER_GUARD) |
okini3939 | 0:8ba6230eefbd | 118 | return -1; |
okini3939 | 0:8ba6230eefbd | 119 | |
okini3939 | 0:8ba6230eefbd | 120 | mad_bit_init(&stream->ptr, ptr); |
okini3939 | 0:8ba6230eefbd | 121 | |
okini3939 | 0:8ba6230eefbd | 122 | return 0; |
okini3939 | 0:8ba6230eefbd | 123 | } |
okini3939 | 0:8ba6230eefbd | 124 | |
okini3939 | 0:8ba6230eefbd | 125 | /* |
okini3939 | 0:8ba6230eefbd | 126 | * NAME: stream->errorstr() |
okini3939 | 0:8ba6230eefbd | 127 | * DESCRIPTION: return a string description of the current error condition |
okini3939 | 0:8ba6230eefbd | 128 | */ |
okini3939 | 0:8ba6230eefbd | 129 | char const *mad_stream_errorstr(struct mad_stream const *stream) |
okini3939 | 0:8ba6230eefbd | 130 | { |
okini3939 | 0:8ba6230eefbd | 131 | switch (stream->error) { |
okini3939 | 0:8ba6230eefbd | 132 | case MAD_ERROR_NONE: return "no error"; |
okini3939 | 0:8ba6230eefbd | 133 | |
okini3939 | 0:8ba6230eefbd | 134 | case MAD_ERROR_BUFLEN: return "input buffer too small (or EOF)"; |
okini3939 | 0:8ba6230eefbd | 135 | case MAD_ERROR_BUFPTR: return "invalid (null) buffer pointer"; |
okini3939 | 0:8ba6230eefbd | 136 | |
okini3939 | 0:8ba6230eefbd | 137 | case MAD_ERROR_NOMEM: return "not enough memory"; |
okini3939 | 0:8ba6230eefbd | 138 | |
okini3939 | 0:8ba6230eefbd | 139 | case MAD_ERROR_LOSTSYNC: return "lost synchronization"; |
okini3939 | 0:8ba6230eefbd | 140 | case MAD_ERROR_BADLAYER: return "reserved header layer value"; |
okini3939 | 0:8ba6230eefbd | 141 | case MAD_ERROR_BADBITRATE: return "forbidden bitrate value"; |
okini3939 | 0:8ba6230eefbd | 142 | case MAD_ERROR_BADSAMPLERATE: return "reserved sample frequency value"; |
okini3939 | 0:8ba6230eefbd | 143 | case MAD_ERROR_BADEMPHASIS: return "reserved emphasis value"; |
okini3939 | 0:8ba6230eefbd | 144 | |
okini3939 | 0:8ba6230eefbd | 145 | case MAD_ERROR_BADCRC: return "CRC check failed"; |
okini3939 | 0:8ba6230eefbd | 146 | case MAD_ERROR_BADBITALLOC: return "forbidden bit allocation value"; |
okini3939 | 0:8ba6230eefbd | 147 | case MAD_ERROR_BADSCALEFACTOR: return "bad scalefactor index"; |
okini3939 | 0:8ba6230eefbd | 148 | case MAD_ERROR_BADMODE: return "bad bitrate/mode combination"; |
okini3939 | 0:8ba6230eefbd | 149 | case MAD_ERROR_BADFRAMELEN: return "bad frame length"; |
okini3939 | 0:8ba6230eefbd | 150 | case MAD_ERROR_BADBIGVALUES: return "bad big_values count"; |
okini3939 | 0:8ba6230eefbd | 151 | case MAD_ERROR_BADBLOCKTYPE: return "reserved block_type"; |
okini3939 | 0:8ba6230eefbd | 152 | case MAD_ERROR_BADSCFSI: return "bad scalefactor selection info"; |
okini3939 | 0:8ba6230eefbd | 153 | case MAD_ERROR_BADDATAPTR: return "bad main_data_begin pointer"; |
okini3939 | 0:8ba6230eefbd | 154 | case MAD_ERROR_BADPART3LEN: return "bad audio data length"; |
okini3939 | 0:8ba6230eefbd | 155 | case MAD_ERROR_BADHUFFTABLE: return "bad Huffman table select"; |
okini3939 | 0:8ba6230eefbd | 156 | case MAD_ERROR_BADHUFFDATA: return "Huffman data overrun"; |
okini3939 | 0:8ba6230eefbd | 157 | case MAD_ERROR_BADSTEREO: return "incompatible block_type for JS"; |
okini3939 | 0:8ba6230eefbd | 158 | } |
okini3939 | 0:8ba6230eefbd | 159 | |
okini3939 | 0:8ba6230eefbd | 160 | return 0; |
okini3939 | 0:8ba6230eefbd | 161 | } |