Mercurial > SDL_sound_CoreAudio
annotate decoders/flac.c @ 355:5dbf2f9cde00
Added docs stuff.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 07 Jun 2002 13:26:13 +0000 |
| parents | 498240aa76f1 |
| children | cbb15ecf423a |
| 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 COPYING in the source's root directory. |
| 155 | 28 * |
| 29 * This file written by Torbjörn Andersson. (d91tan@Update.UU.SE) | |
| 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 #include <assert.h> | |
| 42 | |
| 43 #include "SDL_sound.h" | |
| 44 | |
| 45 #define __SDL_SOUND_INTERNAL__ | |
| 46 #include "SDL_sound_internal.h" | |
| 47 | |
|
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48 /* |
| 312 | 49 * FLAC 1.0.1 added a seekable stream decoder. To be able to reuse as much as |
| 50 * possible of the non-seekable FLAC decoder, we define a set of wrapper | |
| 51 * macros and typedefs to map onto the right set of functions and data types. | |
| 52 * | |
| 53 * An added benefit is that we get identifiers of manageable length. | |
|
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54 */ |
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55 |
| 312 | 56 #if SOUND_SUPPORTS_SEEKABLE_FLAC |
| 57 | |
| 58 #include "FLAC/seekable_stream_decoder.h" | |
| 59 | |
| 60 #define D_END_OF_STREAM FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM | |
| 61 | |
| 62 #define d_new() FLAC__seekable_stream_decoder_new() | |
| 63 #define d_init(x) FLAC__seekable_stream_decoder_init(x) | |
| 64 #define d_process_metadata(x) FLAC__seekable_stream_decoder_process_metadata(x) | |
| 65 #define d_process_one_frame(x) FLAC__seekable_stream_decoder_process_one_frame(x) | |
| 66 #define d_get_state(x) FLAC__seekable_stream_decoder_get_state(x) | |
| 67 #define d_finish(x) FLAC__seekable_stream_decoder_finish(x) | |
| 68 #define d_delete(x) FLAC__seekable_stream_decoder_delete(x) | |
| 69 #define d_set_read_callback(x, y) FLAC__seekable_stream_decoder_set_read_callback(x, y) | |
| 70 #define d_set_write_callback(x, y) FLAC__seekable_stream_decoder_set_write_callback(x, y) | |
| 71 #define d_set_metadata_callback(x, y) FLAC__seekable_stream_decoder_set_metadata_callback(x, y) | |
| 72 #define d_set_error_callback(x, y) FLAC__seekable_stream_decoder_set_error_callback(x, y) | |
| 73 #define d_set_client_data(x, y) FLAC__seekable_stream_decoder_set_client_data(x, y) | |
| 74 | |
| 75 typedef FLAC__SeekableStreamDecoder decoder_t; | |
| 76 typedef FLAC__SeekableStreamDecoderReadStatus d_read_status_t; | |
| 77 | |
| 78 /* Only in the seekable decoder */ | |
| 79 | |
| 80 #define D_SEEK_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK | |
| 81 #define D_SEEK_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR | |
| 82 #define D_TELL_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK | |
| 83 #define D_TELL_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR | |
| 84 #define D_LENGTH_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK | |
| 85 #define D_LENGTH_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR | |
| 86 | |
| 87 #define d_set_seek_callback(x, y) FLAC__seekable_stream_decoder_set_seek_callback(x, y) | |
| 88 #define d_set_tell_callback(x, y) FLAC__seekable_stream_decoder_set_tell_callback(x, y) | |
| 89 #define d_set_length_callback(x, y) FLAC__seekable_stream_decoder_set_length_callback(x, y) | |
| 90 #define d_set_eof_callback(x, y) FLAC__seekable_stream_decoder_set_eof_callback(x, y) | |
| 91 #define d_seek_absolute(x, y) FLAC__seekable_stream_decoder_seek_absolute(x, y) | |
| 92 | |
| 93 typedef FLAC__SeekableStreamDecoderSeekStatus d_seek_status_t; | |
| 94 typedef FLAC__SeekableStreamDecoderTellStatus d_tell_status_t; | |
| 95 typedef FLAC__SeekableStreamDecoderLengthStatus d_length_status_t; | |
| 96 | |
| 97 #else | |
| 98 | |
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99 #include "FLAC/stream_decoder.h" |
| 155 | 100 |
| 312 | 101 #define D_END_OF_STREAM FLAC__STREAM_DECODER_END_OF_STREAM |
| 102 | |
| 103 #define d_new() FLAC__stream_decoder_new() | |
| 104 #define d_init(x) FLAC__stream_decoder_init(x) | |
| 105 #define d_process_metadata(x) FLAC__stream_decoder_process_metadata(x) | |
| 106 #define d_process_one_frame(x) FLAC__stream_decoder_process_one_frame(x) | |
| 107 #define d_get_state(x) FLAC__stream_decoder_get_state(x) | |
| 108 #define d_finish(x) FLAC__stream_decoder_finish(x) | |
| 109 #define d_delete(x) FLAC__stream_decoder_delete(x) | |
| 110 #define d_set_read_callback(x, y) FLAC__stream_decoder_set_read_callback(x, y) | |
| 111 #define d_set_write_callback(x, y) FLAC__stream_decoder_set_write_callback(x, y) | |
| 112 #define d_set_metadata_callback(x, y) FLAC__stream_decoder_set_metadata_callback(x, y) | |
| 113 #define d_set_error_callback(x, y) FLAC__stream_decoder_set_error_callback(x, y) | |
| 114 #define d_set_client_data(x, y) FLAC__stream_decoder_set_client_data(x, y) | |
| 115 | |
| 116 typedef FLAC__StreamDecoder decoder_t; | |
| 117 typedef FLAC__StreamDecoderReadStatus d_read_status_t; | |
| 118 | |
| 119 /* Only in the non-seekable decoder */ | |
| 120 | |
| 121 #define d_reset(x) FLAC__stream_decoder_reset(x) | |
| 122 | |
| 123 #endif | |
| 124 | |
| 125 /* These are the same for both decoders, so they're just cosmetics. */ | |
| 126 | |
| 127 #define D_WRITE_CONTINUE FLAC__STREAM_DECODER_WRITE_CONTINUE | |
| 128 #define D_READ_END_OF_STREAM FLAC__STREAM_DECODER_READ_END_OF_STREAM | |
| 129 #define D_READ_ABORT FLAC__STREAM_DECODER_READ_ABORT | |
| 130 #define D_READ_CONTINUE FLAC__STREAM_DECODER_READ_CONTINUE | |
| 131 | |
| 132 #define d_error_status_string FLAC__StreamDecoderErrorStatusString | |
| 133 | |
| 134 typedef FLAC__StreamDecoderWriteStatus d_write_status_t; | |
| 135 typedef FLAC__StreamDecoderErrorStatus d_error_status_t; | |
| 136 typedef FLAC__StreamMetaData d_metadata_t; | |
| 137 | |
| 155 | 138 |
| 139 static int FLAC_init(void); | |
| 140 static void FLAC_quit(void); | |
| 141 static int FLAC_open(Sound_Sample *sample, const char *ext); | |
| 142 static void FLAC_close(Sound_Sample *sample); | |
| 143 static Uint32 FLAC_read(Sound_Sample *sample); | |
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144 static int FLAC_rewind(Sound_Sample *sample); |
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145 static int FLAC_seek(Sound_Sample *sample, Uint32 ms); |
| 155 | 146 |
| 147 static const char *extensions_flac[] = { "FLAC", "FLA", NULL }; | |
| 148 | |
| 149 const Sound_DecoderFunctions __Sound_DecoderFunctions_FLAC = | |
| 150 { | |
| 151 { | |
| 152 extensions_flac, | |
| 153 "Free Lossless Audio Codec", | |
| 154 "Torbjörn Andersson <d91tan@Update.UU.SE>", | |
| 155 "http://flac.sourceforge.net/" | |
| 156 }, | |
| 157 | |
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158 FLAC_init, /* init() method */ |
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159 FLAC_quit, /* quit() method */ |
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160 FLAC_open, /* open() method */ |
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161 FLAC_close, /* close() method */ |
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162 FLAC_read, /* read() method */ |
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163 FLAC_rewind, /* rewind() method */ |
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164 FLAC_seek /* seek() method */ |
| 155 | 165 }; |
| 166 | |
| 167 /* This is what we store in our internal->decoder_private field. */ | |
| 168 typedef struct | |
| 169 { | |
| 312 | 170 decoder_t *decoder; |
| 155 | 171 SDL_RWops *rw; |
| 172 Sound_Sample *sample; | |
| 173 Uint32 frame_size; | |
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174 Uint8 is_flac; |
| 312 | 175 |
| 176 #if !SOUND_SUPPORTS_SEEKABLE_FLAC | |
| 177 Uint32 data_offset; | |
| 178 #else | |
| 179 Uint32 stream_length; | |
| 180 #endif | |
| 155 | 181 } flac_t; |
| 182 | |
| 183 | |
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184 static void free_flac(flac_t *f) |
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185 { |
| 312 | 186 d_finish(f->decoder); |
| 187 d_delete(f->decoder); | |
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188 free(f); |
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189 } /* free_flac */ |
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190 |
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191 |
| 312 | 192 static d_read_status_t read_callback( |
| 193 const decoder_t *decoder, FLAC__byte buffer[], | |
| 155 | 194 unsigned int *bytes, void *client_data) |
| 195 { | |
| 196 flac_t *f = (flac_t *) client_data; | |
| 197 Uint32 retval; | |
| 198 | |
| 199 retval = SDL_RWread(f->rw, (Uint8 *) buffer, 1, *bytes); | |
| 200 | |
| 201 if (retval == 0) | |
| 202 { | |
| 203 *bytes = 0; | |
| 204 f->sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 312 | 205 return(D_READ_END_OF_STREAM); |
| 155 | 206 } /* if */ |
| 207 | |
| 208 if (retval == -1) | |
| 209 { | |
| 210 *bytes = 0; | |
| 211 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 312 | 212 return(D_READ_ABORT); |
| 155 | 213 } /* if */ |
| 214 | |
| 215 if (retval < *bytes) | |
| 216 { | |
| 217 *bytes = retval; | |
| 218 f->sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 219 } /* if */ | |
| 220 | |
| 312 | 221 return(D_READ_CONTINUE); |
| 222 } /* read_callback */ | |
| 155 | 223 |
| 224 | |
| 312 | 225 static d_write_status_t write_callback( |
| 226 const decoder_t *decoder, const FLAC__Frame *frame, | |
| 155 | 227 const FLAC__int32 *buffer[], void *client_data) |
| 228 { | |
| 229 flac_t *f = (flac_t *) client_data; | |
| 230 Uint32 i, j; | |
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231 Uint32 sample; |
| 155 | 232 Uint8 *dst; |
| 233 | |
| 234 f->frame_size = frame->header.channels * frame->header.blocksize | |
| 235 * frame->header.bits_per_sample / 8; | |
| 236 | |
| 237 if (f->frame_size > f->sample->buffer_size) | |
| 238 Sound_SetBufferSize(f->sample, f->frame_size); | |
| 239 | |
| 240 dst = f->sample->buffer; | |
| 241 | |
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242 /* If the sample is neither exactly 8-bit nor 16-bit, it will have to |
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243 * be converted. Unfortunately the buffer is read-only, so we either |
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244 * have to check for each sample, or make a copy of the buffer. I'm |
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245 * not sure which way is best, so I've arbitrarily picked the former. |
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246 */ |
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247 if (f->sample->actual.format == AUDIO_S8) |
| 155 | 248 { |
| 249 for (i = 0; i < frame->header.blocksize; i++) | |
| 250 for (j = 0; j < frame->header.channels; j++) | |
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251 { |
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252 sample = buffer[j][i]; |
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253 if (frame->header.bits_per_sample < 8) |
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254 sample <<= (8 - frame->header.bits_per_sample); |
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255 *dst++ = sample & 0x00ff; |
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256 } /* for */ |
| 155 | 257 } /* if */ |
| 258 else | |
| 259 { | |
| 260 for (i = 0; i < frame->header.blocksize; i++) | |
| 261 for (j = 0; j < frame->header.channels; j++) | |
| 262 { | |
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263 sample = buffer[j][i]; |
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264 if (frame->header.bits_per_sample < 16) |
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265 sample <<= (16 - frame->header.bits_per_sample); |
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266 else if (frame->header.bits_per_sample > 16) |
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267 sample >>= (frame->header.bits_per_sample - 16); |
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268 *dst++ = (sample & 0xff00) >> 8; |
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269 *dst++ = sample & 0x00ff; |
| 155 | 270 } /* for */ |
| 271 } /* else */ | |
| 272 | |
| 312 | 273 return(D_WRITE_CONTINUE); |
| 274 } /* write_callback */ | |
| 155 | 275 |
| 276 | |
| 312 | 277 static void metadata_callback( |
| 278 const decoder_t *decoder, | |
| 279 const d_metadata_t *metadata, | |
| 155 | 280 void *client_data) |
| 281 { | |
| 282 flac_t *f = (flac_t *) client_data; | |
| 312 | 283 |
| 155 | 284 SNDDBG(("FLAC: Metadata callback.\n")); |
| 285 | |
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286 /* There are several kinds of metadata, but STREAMINFO is the only |
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287 * one that always has to be there. |
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288 */ |
| 155 | 289 if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO) |
| 290 { | |
| 291 SNDDBG(("FLAC: Metadata is streaminfo.\n")); | |
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292 |
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293 f->is_flac = 1; |
| 155 | 294 f->sample->actual.channels = metadata->data.stream_info.channels; |
| 295 f->sample->actual.rate = metadata->data.stream_info.sample_rate; | |
| 296 | |
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297 if (metadata->data.stream_info.bits_per_sample > 8) |
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298 f->sample->actual.format = AUDIO_S16MSB; |
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299 else |
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300 f->sample->actual.format = AUDIO_S8; |
| 155 | 301 } /* if */ |
| 312 | 302 } /* metadata_callback */ |
| 155 | 303 |
| 304 | |
| 312 | 305 static void error_callback( |
| 306 const decoder_t *decoder, | |
| 307 d_error_status_t status, | |
| 155 | 308 void *client_data) |
| 309 { | |
| 310 flac_t *f = (flac_t *) client_data; | |
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311 |
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312 /* !!! FIXME: Is every error really fatal? I don't know... */ |
| 312 | 313 Sound_SetError(d_error_status_string[status]); |
| 155 | 314 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
| 312 | 315 } /* error_callback */ |
| 316 | |
| 317 | |
| 318 #if SOUND_SUPPORTS_SEEKABLE_FLAC | |
| 319 | |
| 320 static d_seek_status_t seek_callback( | |
| 321 const decoder_t *decoder, | |
| 322 FLAC__uint64 absolute_byte_offset, | |
| 323 void *client_data) | |
| 324 { | |
| 325 flac_t *f = (flac_t *) client_data; | |
| 326 | |
| 327 if (SDL_RWseek(f->rw, absolute_byte_offset, SEEK_SET) >= 0) | |
| 328 { | |
| 329 return(D_SEEK_STATUS_OK); | |
| 330 } /* if */ | |
| 331 | |
| 332 return(D_SEEK_STATUS_ERROR); | |
| 333 } /* seek_callback*/ | |
| 334 | |
| 335 | |
| 336 static d_tell_status_t tell_callback( | |
| 337 const decoder_t *decoder, | |
| 338 FLAC__uint64 *absolute_byte_offset, | |
| 339 void *client_data) | |
| 340 { | |
| 341 flac_t *f = (flac_t *) client_data; | |
| 342 int pos; /* !!! FIXME: int? Really? */ | |
| 343 | |
| 344 pos = SDL_RWtell(f->rw); | |
| 345 | |
| 346 if (pos < 0) | |
| 347 { | |
| 348 return(D_TELL_STATUS_ERROR); | |
| 349 } /* if */ | |
| 155 | 350 |
| 312 | 351 *absolute_byte_offset = pos; |
| 352 return(D_TELL_STATUS_OK); | |
| 353 } /* tell_callback */ | |
| 354 | |
| 355 | |
| 356 static d_length_status_t length_callback( | |
| 357 const decoder_t *decoder, | |
| 358 FLAC__uint64 *stream_length, | |
| 359 void *client_data) | |
| 360 { | |
| 361 flac_t *f = (flac_t *) client_data; | |
| 362 | |
| 363 if (f->sample->flags & SOUND_SAMPLEFLAG_CANSEEK) | |
| 364 { | |
| 365 *stream_length = f->stream_length; | |
| 366 return(D_LENGTH_STATUS_OK); | |
| 367 } /* if */ | |
| 368 | |
| 369 return(D_LENGTH_STATUS_ERROR); | |
| 370 } /* length_callback */ | |
| 371 | |
| 372 | |
| 373 static FLAC__bool eof_callback( | |
| 374 const decoder_t *decoder, | |
| 375 void *client_data) | |
| 376 { | |
| 377 flac_t *f = (flac_t *) client_data; | |
| 378 int pos; /* !!! FIXME: int? Really? */ | |
| 379 | |
| 380 /* Maybe we could check for SOUND_SAMPLEFLAG_EOF here instead? */ | |
| 381 pos = SDL_RWtell(f->rw); | |
| 382 | |
| 383 if (pos >= 0 && pos >= f->stream_length) | |
| 384 { | |
| 385 return(true); | |
| 386 } /* if */ | |
| 387 | |
| 388 return(false); | |
| 389 } /* eof_callback */ | |
| 390 | |
| 391 #endif | |
| 155 | 392 |
| 393 static int FLAC_init(void) | |
| 394 { | |
| 395 return(1); /* always succeeds. */ | |
| 396 } /* FLAC_init */ | |
| 397 | |
| 398 | |
| 399 static void FLAC_quit(void) | |
| 400 { | |
| 401 /* it's a no-op. */ | |
| 402 } /* FLAC_quit */ | |
| 403 | |
| 404 | |
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405 #define FLAC_MAGIC 0x43614C66 /* "fLaC" in ASCII. */ |
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406 |
| 155 | 407 static int FLAC_open(Sound_Sample *sample, const char *ext) |
| 408 { | |
| 409 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 410 SDL_RWops *rw = internal->rw; | |
| 312 | 411 decoder_t *decoder; |
| 155 | 412 flac_t *f; |
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413 int i; |
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414 int has_extension = 0; |
| 312 | 415 |
| 416 #if SOUND_SUPPORTS_SEEKABLE_FLAC | |
| 417 Uint32 pos; | |
| 418 #endif | |
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419 |
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420 /* |
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421 * If the extension is "flac", we'll believe that this is really meant |
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422 * to be a FLAC stream, and will try to grok it from existing metadata. |
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423 * metadata searching can be a very expensive operation, however, so |
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424 * unless the user swears that it is a FLAC stream through the extension, |
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425 * we decide what to do based on the existance of a 32-bit magic number. |
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426 */ |
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427 for (i = 0; extensions_flac[i] != NULL; i++) |
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428 { |
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429 if (__Sound_strcasecmp(ext, extensions_flac[i]) == 0) |
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430 { |
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431 has_extension = 1; |
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432 break; |
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433 } /* if */ |
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434 } /* for */ |
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435 |
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436 if (!has_extension) |
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437 { |
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438 int rc; |
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439 Uint32 flac_magic = SDL_ReadLE32(rw); |
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440 BAIL_IF_MACRO(flac_magic != FLAC_MAGIC, "FLAC: Not a FLAC stream.", 0); |
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441 |
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442 /* move back over magic number for metadata scan... */ |
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443 rc = SDL_RWseek(internal->rw, -sizeof (flac_magic), SEEK_CUR); |
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444 BAIL_IF_MACRO(rc < 0, ERR_IO_ERROR, 0); |
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445 } /* if */ |
| 155 | 446 |
| 447 f = (flac_t *) malloc(sizeof (flac_t)); | |
| 448 BAIL_IF_MACRO(f == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 449 | |
| 312 | 450 decoder = d_new(); |
| 155 | 451 if (decoder == NULL) |
| 452 { | |
| 453 Sound_SetError(ERR_OUT_OF_MEMORY); | |
| 454 free(f); | |
| 455 return(0); | |
| 456 } /* if */ | |
| 457 | |
| 312 | 458 d_set_read_callback(decoder, read_callback); |
| 459 d_set_write_callback(decoder, write_callback); | |
| 460 d_set_metadata_callback(decoder, metadata_callback); | |
| 461 d_set_error_callback(decoder, error_callback); | |
| 462 | |
| 463 #if SOUND_SUPPORTS_SEEKABLE_FLAC | |
| 464 d_set_seek_callback(decoder, seek_callback); | |
| 465 d_set_tell_callback(decoder, tell_callback); | |
| 466 d_set_length_callback(decoder, length_callback); | |
| 467 d_set_eof_callback(decoder, eof_callback); | |
| 468 #endif | |
| 469 | |
| 470 d_set_client_data(decoder, f); | |
| 155 | 471 |
| 472 f->rw = internal->rw; | |
| 473 f->sample = sample; | |
| 474 f->decoder = decoder; | |
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475 f->sample->actual.format = 0; |
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476 f->is_flac = 0 /* !!! FIXME: should be "has_extension", not "0". */; |
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477 |
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478 internal->decoder_private = f; |
| 312 | 479 d_init(decoder); |
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480 |
| 312 | 481 #if !SOUND_SUPPORTS_SEEKABLE_FLAC |
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482 /* |
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483 * Annoyingly, the rewind method will put the FLAC decoder in a state |
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484 * where it expects to read metadata, so we have to set this marker |
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485 * before the metadata block. |
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486 */ |
| 312 | 487 f->data_offset = SDL_RWtell(f->rw); |
| 488 #endif | |
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489 |
| 312 | 490 sample->flags = SOUND_SAMPLEFLAG_NONE; |
| 491 | |
| 492 #if SOUND_SUPPORTS_SEEKABLE_FLAC | |
| 493 /* | |
| 494 * FIXME?: For the seekable stream decoder to work, we need to know | |
| 495 * the length of the stream. This is so ugly... | |
| 496 */ | |
| 497 pos = SDL_RWtell(f->rw); | |
| 498 if (SDL_RWseek(f->rw, 0, SEEK_END)) | |
| 499 { | |
| 500 f->stream_length = SDL_RWtell(f->rw); | |
| 501 SDL_RWseek(f->rw, pos, SEEK_SET); | |
| 502 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; | |
| 503 } /* if */ | |
| 504 #endif | |
| 505 | |
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506 /* |
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507 * If we are not sure this is a FLAC stream, check for the STREAMINFO |
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508 * metadata block. If not, we'd have to peek at the first audio frame |
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509 * and get the sound format from there, but that is not yet |
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510 * implemented. |
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511 */ |
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512 if (!f->is_flac) |
| 155 | 513 { |
| 312 | 514 d_process_metadata(decoder); |
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515 |
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516 /* Still not FLAC? Give up. */ |
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517 if (!f->is_flac) |
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518 { |
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519 Sound_SetError("FLAC: No metadata found. Not a FLAC stream?"); |
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520 free_flac(f); |
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521 return(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 { |
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547 Sound_SetError("FLAC: Couldn't decode frame."); |
| 155 | 548 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
| 549 return(0); | |
| 550 } /* if */ | |
| 551 | |
| 312 | 552 if (d_get_state(f->decoder) == D_END_OF_STREAM) |
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553 { |
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554 sample->flags |= SOUND_SAMPLEFLAG_EOF; |
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555 return(0); |
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556 } /* if */ |
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557 |
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558 /* An error may have been signalled through the error callback. */ |
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559 if (sample->flags & SOUND_SAMPLEFLAG_ERROR) |
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560 return(0); |
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561 |
| 155 | 562 return(f->frame_size); |
| 563 } /* FLAC_read */ | |
| 564 | |
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565 |
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566 static int FLAC_rewind(Sound_Sample *sample) |
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567 { |
| 312 | 568 #if SOUND_SUPPORTS_SEEKABLE_FLAC |
| 569 return FLAC_seek(sample, 0); | |
| 570 #else | |
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571 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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572 flac_t *f = (flac_t *) internal->decoder_private; |
| 312 | 573 int rc = SDL_RWseek(f->rw, f->data_offset, SEEK_SET); |
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574 |
| 312 | 575 BAIL_IF_MACRO(rc != f->data_offset, ERR_IO_ERROR, 0); |
| 576 BAIL_IF_MACRO(!d_reset(f->decoder), "FLAC: could not reset decoder", 0); | |
| 577 d_process_metadata(f->decoder); | |
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Rewind method implemented by Torbj�rn.
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578 return(1); |
| 312 | 579 #endif |
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580 } /* FLAC_rewind */ |
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581 |
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Added framework for Sound_Seek() support.
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582 |
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Added framework for Sound_Seek() support.
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583 static int FLAC_seek(Sound_Sample *sample, Uint32 ms) |
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Added framework for Sound_Seek() support.
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584 { |
| 312 | 585 #if SOUND_SUPPORTS_SEEKABLE_FLAC |
| 586 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 587 flac_t *f = (flac_t *) internal->decoder_private; | |
| 588 | |
| 589 d_seek_absolute(f->decoder, (ms * sample->actual.rate) / 1000); | |
| 590 return(1); | |
| 591 #else | |
| 592 BAIL_MACRO("FLAC: This is the non-seekable version of the decoder!", 0); | |
| 593 #endif | |
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594 } /* FLAC_seek */ |
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Added framework for Sound_Seek() support.
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595 |
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Added framework for Sound_Seek() support.
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596 |
| 155 | 597 #endif /* SOUND_SUPPORTS_FLAC */ |
| 598 | |
| 599 | |
| 600 /* end of flac.c ... */ |