Mercurial > SDL_sound_CoreAudio
annotate decoders/flac.c @ 562:7e08477b0fc1
MP3 decoder upgrade work.
Ripped out SMPEG and mpglib support, replaced it with "mpg123.c" and libmpg123.
libmpg123 is a much better version of mpglib, so it should solve all the
problems about MP3's not seeking, or most modern MP3's not playing at all,
etc. Since you no longer have to make a tradeoff with SMPEG for features, and
SMPEG is basically rotting, I removed it from the project.
There is still work to be done with libmpg123...there are MMX, 3DNow, SSE,
Altivec, etc decoders which we don't have enabled at the moment, and the
build system could use some work to make this compile more cleanly, etc.
Still: huge win.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 30 Jan 2009 02:44:47 -0500 |
| parents | 2e8907ff98e9 |
| children |
| rev | line source |
|---|---|
| 155 | 1 /* |
| 2 * SDL_sound -- An abstract sound format decoding API. | |
| 3 * Copyright (C) 2001 Ryan C. Gordon. | |
| 4 * | |
| 5 * This library is free software; you can redistribute it and/or | |
| 6 * modify it under the terms of the GNU Lesser General Public | |
| 7 * License as published by the Free Software Foundation; either | |
| 8 * version 2.1 of the License, or (at your option) any later version. | |
| 9 * | |
| 10 * This library is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 * Lesser General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU Lesser General Public | |
| 16 * License along with this library; if not, write to the Free Software | |
| 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 */ | |
| 19 | |
| 20 /* | |
| 21 * FLAC decoder for SDL_sound. | |
| 22 * | |
| 23 * This driver handles FLAC audio, that is to say the Free Lossless Audio | |
| 24 * Codec. It depends on libFLAC for decoding, which can be grabbed from: | |
| 25 * http://flac.sourceforge.net | |
| 26 * | |
|
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27 * Please see the file LICENSE.txt in the source's root directory. |
| 155 | 28 * |
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29 * This file written by Torbjörn Andersson. (d91tan@Update.UU.SE) |
| 155 | 30 */ |
| 31 | |
| 32 #if HAVE_CONFIG_H | |
| 33 # include <config.h> | |
| 34 #endif | |
| 35 | |
| 36 #ifdef SOUND_SUPPORTS_FLAC | |
| 37 | |
| 38 #include <stdio.h> | |
| 39 #include <stdlib.h> | |
| 40 #include <string.h> | |
| 41 | |
| 42 #include "SDL_sound.h" | |
| 43 | |
| 44 #define __SDL_SOUND_INTERNAL__ | |
| 45 #include "SDL_sound_internal.h" | |
| 46 | |
|
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47 #include <FLAC/export.h> |
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48 |
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49 /* FLAC 1.1.3 has FLAC_API_VERSION_CURRENT == 8 */ |
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50 #if !defined(FLAC_API_VERSION_CURRENT) || FLAC_API_VERSION_CURRENT < 8 |
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51 #define LEGACY_FLAC |
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52 #else |
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53 #undef LEGACY_FLAC |
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54 #endif |
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55 |
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56 #ifdef LEGACY_FLAC |
| 443 | 57 #include <FLAC/seekable_stream_decoder.h> |
| 312 | 58 |
| 59 #define D_END_OF_STREAM FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM | |
| 60 | |
| 61 #define d_new() FLAC__seekable_stream_decoder_new() | |
| 62 #define d_init(x) FLAC__seekable_stream_decoder_init(x) | |
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63 #define d_process_metadata(x) FLAC__seekable_stream_decoder_process_until_end_of_metadata(x) |
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64 #define d_process_one_frame(x) FLAC__seekable_stream_decoder_process_single(x) |
| 312 | 65 #define d_get_state(x) FLAC__seekable_stream_decoder_get_state(x) |
| 66 #define d_finish(x) FLAC__seekable_stream_decoder_finish(x) | |
| 67 #define d_delete(x) FLAC__seekable_stream_decoder_delete(x) | |
| 68 #define d_set_read_callback(x, y) FLAC__seekable_stream_decoder_set_read_callback(x, y) | |
| 69 #define d_set_write_callback(x, y) FLAC__seekable_stream_decoder_set_write_callback(x, y) | |
| 70 #define d_set_metadata_callback(x, y) FLAC__seekable_stream_decoder_set_metadata_callback(x, y) | |
| 71 #define d_set_error_callback(x, y) FLAC__seekable_stream_decoder_set_error_callback(x, y) | |
| 72 #define d_set_client_data(x, y) FLAC__seekable_stream_decoder_set_client_data(x, y) | |
| 73 | |
| 74 typedef FLAC__SeekableStreamDecoder decoder_t; | |
| 75 typedef FLAC__SeekableStreamDecoderReadStatus d_read_status_t; | |
| 76 | |
| 77 #define D_SEEK_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK | |
| 78 #define D_SEEK_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR | |
| 79 #define D_TELL_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK | |
| 80 #define D_TELL_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR | |
| 81 #define D_LENGTH_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK | |
| 82 #define D_LENGTH_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR | |
| 83 | |
| 84 #define d_set_seek_callback(x, y) FLAC__seekable_stream_decoder_set_seek_callback(x, y) | |
| 85 #define d_set_tell_callback(x, y) FLAC__seekable_stream_decoder_set_tell_callback(x, y) | |
| 86 #define d_set_length_callback(x, y) FLAC__seekable_stream_decoder_set_length_callback(x, y) | |
| 87 #define d_set_eof_callback(x, y) FLAC__seekable_stream_decoder_set_eof_callback(x, y) | |
| 88 #define d_seek_absolute(x, y) FLAC__seekable_stream_decoder_seek_absolute(x, y) | |
| 89 | |
| 90 typedef FLAC__SeekableStreamDecoderSeekStatus d_seek_status_t; | |
| 91 typedef FLAC__SeekableStreamDecoderTellStatus d_tell_status_t; | |
| 92 typedef FLAC__SeekableStreamDecoderLengthStatus d_length_status_t; | |
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93 #else |
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94 #include <FLAC/stream_decoder.h> |
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95 |
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96 #define D_END_OF_STREAM FLAC__STREAM_DECODER_END_OF_STREAM |
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97 |
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98 #define d_new() FLAC__stream_decoder_new() |
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99 #define d_process_metadata(x) FLAC__stream_decoder_process_until_end_of_metadata(x) |
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100 #define d_process_one_frame(x) FLAC__stream_decoder_process_single(x) |
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101 #define d_get_state(x) FLAC__stream_decoder_get_state(x) |
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102 #define d_finish(x) FLAC__stream_decoder_finish(x) |
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103 #define d_delete(x) FLAC__stream_decoder_delete(x) |
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104 |
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105 typedef FLAC__StreamDecoder decoder_t; |
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106 typedef FLAC__StreamDecoderReadStatus d_read_status_t; |
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107 |
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108 #define D_SEEK_STATUS_OK FLAC__STREAM_DECODER_SEEK_STATUS_OK |
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109 #define D_SEEK_STATUS_ERROR FLAC__STREAM_DECODER_SEEK_STATUS_ERROR |
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110 #define D_TELL_STATUS_OK FLAC__STREAM_DECODER_TELL_STATUS_OK |
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111 #define D_TELL_STATUS_ERROR FLAC__STREAM_DECODER_TELL_STATUS_ERROR |
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112 #define D_LENGTH_STATUS_OK FLAC__STREAM_DECODER_LENGTH_STATUS_OK |
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113 #define D_LENGTH_STATUS_ERROR FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR |
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114 |
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115 #define d_seek_absolute(x, y) FLAC__stream_decoder_seek_absolute(x, y) |
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116 |
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117 typedef FLAC__StreamDecoderSeekStatus d_seek_status_t; |
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118 typedef FLAC__StreamDecoderTellStatus d_tell_status_t; |
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119 typedef FLAC__StreamDecoderLengthStatus d_length_status_t; |
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120 #endif |
| 312 | 121 |
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122 #define D_WRITE_CONTINUE FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE |
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123 #define D_READ_END_OF_STREAM FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM |
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124 #define D_READ_ABORT FLAC__STREAM_DECODER_READ_STATUS_ABORT |
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125 #define D_READ_CONTINUE FLAC__STREAM_DECODER_READ_STATUS_CONTINUE |
| 312 | 126 |
| 127 #define d_error_status_string FLAC__StreamDecoderErrorStatusString | |
| 128 | |
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129 typedef FLAC__StreamDecoderErrorStatus d_error_status_t; |
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130 typedef FLAC__StreamMetadata d_metadata_t; |
| 312 | 131 typedef FLAC__StreamDecoderWriteStatus d_write_status_t; |
| 132 | |
| 155 | 133 |
| 134 static int FLAC_init(void); | |
| 135 static void FLAC_quit(void); | |
| 136 static int FLAC_open(Sound_Sample *sample, const char *ext); | |
| 137 static void FLAC_close(Sound_Sample *sample); | |
| 138 static Uint32 FLAC_read(Sound_Sample *sample); | |
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139 static int FLAC_rewind(Sound_Sample *sample); |
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140 static int FLAC_seek(Sound_Sample *sample, Uint32 ms); |
| 155 | 141 |
| 142 static const char *extensions_flac[] = { "FLAC", "FLA", NULL }; | |
| 143 | |
| 144 const Sound_DecoderFunctions __Sound_DecoderFunctions_FLAC = | |
| 145 { | |
| 146 { | |
| 147 extensions_flac, | |
| 148 "Free Lossless Audio Codec", | |
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149 "Torbjörn Andersson <d91tan@Update.UU.SE>", |
| 155 | 150 "http://flac.sourceforge.net/" |
| 151 }, | |
| 152 | |
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153 FLAC_init, /* init() method */ |
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154 FLAC_quit, /* quit() method */ |
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155 FLAC_open, /* open() method */ |
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156 FLAC_close, /* close() method */ |
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157 FLAC_read, /* read() method */ |
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158 FLAC_rewind, /* rewind() method */ |
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159 FLAC_seek /* seek() method */ |
| 155 | 160 }; |
| 161 | |
| 162 /* This is what we store in our internal->decoder_private field. */ | |
| 163 typedef struct | |
| 164 { | |
| 312 | 165 decoder_t *decoder; |
| 155 | 166 SDL_RWops *rw; |
| 167 Sound_Sample *sample; | |
| 168 Uint32 frame_size; | |
|
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169 Uint8 is_flac; |
| 312 | 170 Uint32 stream_length; |
| 155 | 171 } flac_t; |
| 172 | |
| 173 | |
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174 static void free_flac(flac_t *f) |
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175 { |
| 312 | 176 d_finish(f->decoder); |
| 177 d_delete(f->decoder); | |
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178 free(f); |
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179 } /* free_flac */ |
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180 |
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181 |
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182 #ifdef LEGACY_FLAC |
| 312 | 183 static d_read_status_t read_callback( |
| 184 const decoder_t *decoder, FLAC__byte buffer[], | |
| 155 | 185 unsigned int *bytes, void *client_data) |
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186 #else |
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187 static d_read_status_t read_callback( |
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188 const decoder_t *decoder, FLAC__byte buffer[], |
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189 size_t *bytes, void *client_data) |
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190 #endif |
| 155 | 191 { |
| 192 flac_t *f = (flac_t *) client_data; | |
| 193 Uint32 retval; | |
| 194 | |
| 195 retval = SDL_RWread(f->rw, (Uint8 *) buffer, 1, *bytes); | |
| 196 | |
| 197 if (retval == 0) | |
| 198 { | |
| 199 *bytes = 0; | |
| 200 f->sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 312 | 201 return(D_READ_END_OF_STREAM); |
| 155 | 202 } /* if */ |
| 203 | |
| 204 if (retval == -1) | |
| 205 { | |
| 206 *bytes = 0; | |
| 207 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 312 | 208 return(D_READ_ABORT); |
| 155 | 209 } /* if */ |
| 210 | |
| 211 if (retval < *bytes) | |
| 212 { | |
| 213 *bytes = retval; | |
| 214 f->sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 215 } /* if */ | |
| 216 | |
| 312 | 217 return(D_READ_CONTINUE); |
| 218 } /* read_callback */ | |
| 155 | 219 |
| 220 | |
| 312 | 221 static d_write_status_t write_callback( |
| 222 const decoder_t *decoder, const FLAC__Frame *frame, | |
|
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223 const FLAC__int32 * const buffer[], |
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224 void *client_data) |
| 155 | 225 { |
| 226 flac_t *f = (flac_t *) client_data; | |
| 227 Uint32 i, j; | |
|
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228 Uint32 sample; |
| 155 | 229 Uint8 *dst; |
| 230 | |
| 231 f->frame_size = frame->header.channels * frame->header.blocksize | |
| 232 * frame->header.bits_per_sample / 8; | |
| 233 | |
| 234 if (f->frame_size > f->sample->buffer_size) | |
| 235 Sound_SetBufferSize(f->sample, f->frame_size); | |
| 236 | |
| 237 dst = f->sample->buffer; | |
| 238 | |
|
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239 /* If the sample is neither exactly 8-bit nor 16-bit, it will have to |
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240 * be converted. Unfortunately the buffer is read-only, so we either |
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241 * have to check for each sample, or make a copy of the buffer. I'm |
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242 * not sure which way is best, so I've arbitrarily picked the former. |
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243 */ |
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244 if (f->sample->actual.format == AUDIO_S8) |
| 155 | 245 { |
| 246 for (i = 0; i < frame->header.blocksize; i++) | |
| 247 for (j = 0; j < frame->header.channels; j++) | |
|
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248 { |
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249 sample = buffer[j][i]; |
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250 if (frame->header.bits_per_sample < 8) |
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251 sample <<= (8 - frame->header.bits_per_sample); |
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252 *dst++ = sample & 0x00ff; |
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253 } /* for */ |
| 155 | 254 } /* if */ |
| 255 else | |
| 256 { | |
| 257 for (i = 0; i < frame->header.blocksize; i++) | |
| 258 for (j = 0; j < frame->header.channels; j++) | |
| 259 { | |
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260 sample = buffer[j][i]; |
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261 if (frame->header.bits_per_sample < 16) |
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262 sample <<= (16 - frame->header.bits_per_sample); |
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263 else if (frame->header.bits_per_sample > 16) |
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264 sample >>= (frame->header.bits_per_sample - 16); |
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265 *dst++ = (sample & 0xff00) >> 8; |
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266 *dst++ = sample & 0x00ff; |
| 155 | 267 } /* for */ |
| 268 } /* else */ | |
| 269 | |
| 312 | 270 return(D_WRITE_CONTINUE); |
| 271 } /* write_callback */ | |
| 155 | 272 |
| 273 | |
| 312 | 274 static void metadata_callback( |
| 275 const decoder_t *decoder, | |
| 276 const d_metadata_t *metadata, | |
| 155 | 277 void *client_data) |
| 278 { | |
| 279 flac_t *f = (flac_t *) client_data; | |
|
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280 Sound_Sample *sample = f->sample; |
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281 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
| 312 | 282 |
| 155 | 283 SNDDBG(("FLAC: Metadata callback.\n")); |
| 284 | |
|
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285 /* There are several kinds of metadata, but STREAMINFO is the only |
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286 * one that always has to be there. |
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287 */ |
| 155 | 288 if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO) |
| 289 { | |
| 290 SNDDBG(("FLAC: Metadata is streaminfo.\n")); | |
|
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291 |
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292 f->is_flac = 1; |
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293 sample->actual.channels = metadata->data.stream_info.channels; |
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294 sample->actual.rate = metadata->data.stream_info.sample_rate; |
| 155 | 295 |
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296 if (metadata->data.stream_info.sample_rate == 0 || |
|
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297 metadata->data.stream_info.total_samples == 0) |
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298 { |
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299 internal->total_time = -1; |
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300 } /* if */ |
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301 else |
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302 { |
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303 internal->total_time = (metadata->data.stream_info.total_samples) |
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304 / metadata->data.stream_info.sample_rate * 1000; |
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305 internal->total_time += (metadata->data.stream_info.total_samples |
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306 % metadata->data.stream_info.sample_rate) * 1000 |
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307 / metadata->data.stream_info.sample_rate; |
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308 } /* else */ |
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309 |
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310 if (metadata->data.stream_info.bits_per_sample > 8) |
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311 sample->actual.format = AUDIO_S16MSB; |
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312 else |
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313 sample->actual.format = AUDIO_S8; |
| 155 | 314 } /* if */ |
| 312 | 315 } /* metadata_callback */ |
| 155 | 316 |
| 317 | |
| 312 | 318 static void error_callback( |
| 319 const decoder_t *decoder, | |
| 320 d_error_status_t status, | |
| 155 | 321 void *client_data) |
| 322 { | |
| 323 flac_t *f = (flac_t *) client_data; | |
|
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324 |
|
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325 __Sound_SetError(d_error_status_string[status]); |
| 155 | 326 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
| 312 | 327 } /* error_callback */ |
| 328 | |
| 329 | |
| 330 static d_seek_status_t seek_callback( | |
| 331 const decoder_t *decoder, | |
| 332 FLAC__uint64 absolute_byte_offset, | |
| 333 void *client_data) | |
| 334 { | |
| 335 flac_t *f = (flac_t *) client_data; | |
| 336 | |
| 337 if (SDL_RWseek(f->rw, absolute_byte_offset, SEEK_SET) >= 0) | |
| 338 { | |
| 339 return(D_SEEK_STATUS_OK); | |
| 340 } /* if */ | |
| 341 | |
| 342 return(D_SEEK_STATUS_ERROR); | |
| 343 } /* seek_callback*/ | |
| 344 | |
| 345 | |
| 346 static d_tell_status_t tell_callback( | |
| 347 const decoder_t *decoder, | |
| 348 FLAC__uint64 *absolute_byte_offset, | |
| 349 void *client_data) | |
| 350 { | |
| 351 flac_t *f = (flac_t *) client_data; | |
| 400 | 352 int pos; |
| 312 | 353 |
| 354 pos = SDL_RWtell(f->rw); | |
| 355 | |
| 356 if (pos < 0) | |
| 357 { | |
| 358 return(D_TELL_STATUS_ERROR); | |
| 359 } /* if */ | |
| 155 | 360 |
| 312 | 361 *absolute_byte_offset = pos; |
| 362 return(D_TELL_STATUS_OK); | |
| 363 } /* tell_callback */ | |
| 364 | |
| 365 | |
| 366 static d_length_status_t length_callback( | |
| 367 const decoder_t *decoder, | |
| 368 FLAC__uint64 *stream_length, | |
| 369 void *client_data) | |
| 370 { | |
| 371 flac_t *f = (flac_t *) client_data; | |
| 372 | |
| 373 if (f->sample->flags & SOUND_SAMPLEFLAG_CANSEEK) | |
| 374 { | |
| 375 *stream_length = f->stream_length; | |
| 376 return(D_LENGTH_STATUS_OK); | |
| 377 } /* if */ | |
| 378 | |
| 379 return(D_LENGTH_STATUS_ERROR); | |
| 380 } /* length_callback */ | |
| 381 | |
| 382 | |
| 383 static FLAC__bool eof_callback( | |
| 384 const decoder_t *decoder, | |
| 385 void *client_data) | |
| 386 { | |
| 387 flac_t *f = (flac_t *) client_data; | |
| 400 | 388 int pos; |
| 312 | 389 |
| 390 /* Maybe we could check for SOUND_SAMPLEFLAG_EOF here instead? */ | |
| 391 pos = SDL_RWtell(f->rw); | |
| 392 | |
| 393 if (pos >= 0 && pos >= f->stream_length) | |
| 394 { | |
| 395 return(true); | |
| 396 } /* if */ | |
| 397 | |
| 398 return(false); | |
| 399 } /* eof_callback */ | |
| 400 | |
| 155 | 401 |
| 402 static int FLAC_init(void) | |
| 403 { | |
| 404 return(1); /* always succeeds. */ | |
| 405 } /* FLAC_init */ | |
| 406 | |
| 407 | |
| 408 static void FLAC_quit(void) | |
| 409 { | |
| 410 /* it's a no-op. */ | |
| 411 } /* FLAC_quit */ | |
| 412 | |
| 413 | |
|
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414 #define FLAC_MAGIC 0x43614C66 /* "fLaC" in ASCII. */ |
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415 |
| 155 | 416 static int FLAC_open(Sound_Sample *sample, const char *ext) |
| 417 { | |
| 418 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 419 SDL_RWops *rw = internal->rw; | |
| 312 | 420 decoder_t *decoder; |
| 155 | 421 flac_t *f; |
|
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422 int i; |
|
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423 int has_extension = 0; |
| 312 | 424 Uint32 pos; |
|
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425 |
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426 /* |
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427 * If the extension is "flac", we'll believe that this is really meant |
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428 * to be a FLAC stream, and will try to grok it from existing metadata. |
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429 * metadata searching can be a very expensive operation, however, so |
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430 * unless the user swears that it is a FLAC stream through the extension, |
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431 * we decide what to do based on the existance of a 32-bit magic number. |
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432 */ |
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433 for (i = 0; extensions_flac[i] != NULL; i++) |
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434 { |
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435 if (__Sound_strcasecmp(ext, extensions_flac[i]) == 0) |
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436 { |
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437 has_extension = 1; |
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438 break; |
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439 } /* if */ |
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440 } /* for */ |
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441 |
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442 if (!has_extension) |
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443 { |
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444 int rc; |
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445 Uint32 flac_magic = SDL_ReadLE32(rw); |
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446 BAIL_IF_MACRO(flac_magic != FLAC_MAGIC, "FLAC: Not a FLAC stream.", 0); |
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447 |
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448 /* move back over magic number for metadata scan... */ |
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449 rc = SDL_RWseek(internal->rw, -sizeof (flac_magic), SEEK_CUR); |
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450 BAIL_IF_MACRO(rc < 0, ERR_IO_ERROR, 0); |
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451 } /* if */ |
| 155 | 452 |
| 453 f = (flac_t *) malloc(sizeof (flac_t)); | |
| 454 BAIL_IF_MACRO(f == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 455 | |
| 312 | 456 decoder = d_new(); |
| 155 | 457 if (decoder == NULL) |
| 458 { | |
| 459 free(f); | |
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460 BAIL_MACRO(ERR_OUT_OF_MEMORY, 0); |
| 155 | 461 } /* if */ |
| 462 | |
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463 #ifdef LEGACY_FLAC |
| 312 | 464 d_set_read_callback(decoder, read_callback); |
| 465 d_set_write_callback(decoder, write_callback); | |
| 466 d_set_metadata_callback(decoder, metadata_callback); | |
| 467 d_set_error_callback(decoder, error_callback); | |
| 468 d_set_seek_callback(decoder, seek_callback); | |
| 469 d_set_tell_callback(decoder, tell_callback); | |
| 470 d_set_length_callback(decoder, length_callback); | |
| 471 d_set_eof_callback(decoder, eof_callback); | |
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472 |
| 312 | 473 d_set_client_data(decoder, f); |
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474 #endif |
| 155 | 475 |
| 476 f->rw = internal->rw; | |
| 477 f->sample = sample; | |
| 478 f->decoder = decoder; | |
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479 f->sample->actual.format = 0; |
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480 f->is_flac = 0 /* !!! FIXME: should be "has_extension", not "0". */; |
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481 |
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482 internal->decoder_private = f; |
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483 /* really should check the init return value here: */ |
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484 #ifdef LEGACY_FLAC |
| 312 | 485 d_init(decoder); |
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486 #else |
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487 FLAC__stream_decoder_init_stream(decoder, read_callback, seek_callback, |
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488 tell_callback, length_callback, |
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489 eof_callback, write_callback, |
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490 metadata_callback, error_callback, f); |
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491 #endif |
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492 |
| 400 | 493 sample->flags = SOUND_SAMPLEFLAG_NONE; |
| 494 | |
| 495 pos = SDL_RWtell(f->rw); | |
| 496 if (SDL_RWseek(f->rw, 0, SEEK_END) > 0) | |
| 497 { | |
| 498 f->stream_length = SDL_RWtell(f->rw); | |
| 499 if (SDL_RWseek(f->rw, pos, SEEK_SET) == -1) | |
| 500 { | |
| 501 free_flac(f); | |
| 502 BAIL_MACRO(ERR_IO_ERROR, 0); | |
| 503 } /* if */ | |
| 504 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; | |
| 505 } /* if */ | |
| 506 | |
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507 /* |
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508 * If we are not sure this is a FLAC stream, check for the STREAMINFO |
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509 * metadata block. If not, we'd have to peek at the first audio frame |
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510 * and get the sound format from there, but that is not yet |
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511 * implemented. |
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512 */ |
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513 if (!f->is_flac) |
| 155 | 514 { |
| 312 | 515 d_process_metadata(decoder); |
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516 |
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517 /* Still not FLAC? Give up. */ |
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518 if (!f->is_flac) |
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519 { |
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520 free_flac(f); |
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521 BAIL_MACRO("FLAC: No metadata found. Not a FLAC stream?", 0); |
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522 } /* if */ |
| 155 | 523 } /* if */ |
| 524 | |
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525 SNDDBG(("FLAC: Accepting data stream.\n")); |
| 155 | 526 return(1); |
| 527 } /* FLAC_open */ | |
| 528 | |
| 529 | |
| 530 static void FLAC_close(Sound_Sample *sample) | |
| 531 { | |
| 532 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 533 flac_t *f = (flac_t *) internal->decoder_private; | |
| 534 | |
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535 free_flac(f); |
| 155 | 536 } /* FLAC_close */ |
| 537 | |
| 538 | |
| 539 static Uint32 FLAC_read(Sound_Sample *sample) | |
| 540 { | |
| 541 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 542 flac_t *f = (flac_t *) internal->decoder_private; | |
| 543 Uint32 len; | |
| 544 | |
| 312 | 545 if (!d_process_one_frame(f->decoder)) |
| 155 | 546 { |
| 547 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
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548 BAIL_MACRO("FLAC: Couldn't decode frame.", 0); |
| 155 | 549 } /* if */ |
| 550 | |
| 312 | 551 if (d_get_state(f->decoder) == D_END_OF_STREAM) |
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552 { |
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553 sample->flags |= SOUND_SAMPLEFLAG_EOF; |
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554 return(0); |
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555 } /* if */ |
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556 |
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557 /* An error may have been signalled through the error callback. */ |
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558 if (sample->flags & SOUND_SAMPLEFLAG_ERROR) |
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559 return(0); |
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560 |
| 155 | 561 return(f->frame_size); |
| 562 } /* FLAC_read */ | |
| 563 | |
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564 |
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565 static int FLAC_rewind(Sound_Sample *sample) |
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566 { |
| 312 | 567 return FLAC_seek(sample, 0); |
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568 } /* FLAC_rewind */ |
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569 |
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570 |
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571 static int FLAC_seek(Sound_Sample *sample, Uint32 ms) |
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572 { |
| 312 | 573 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
| 574 flac_t *f = (flac_t *) internal->decoder_private; | |
| 575 | |
| 576 d_seek_absolute(f->decoder, (ms * sample->actual.rate) / 1000); | |
| 577 return(1); | |
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578 } /* FLAC_seek */ |
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579 |
| 155 | 580 #endif /* SOUND_SUPPORTS_FLAC */ |
| 581 | |
| 582 /* end of flac.c ... */ |