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comparison decoders/flac.c @ 231:d3dc34315ac7

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Rewind method implemented by Torbj�rn.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 19 Jan 2002 16:58:34 +0000
parents c9772a9f5271
children c97be6e1bd27
comparison
equal deleted inserted replaced
230:aa4137f121e4 231:d3dc34315ac7
42 42
43 #include "SDL_sound.h" 43 #include "SDL_sound.h"
44 44
45 #define __SDL_SOUND_INTERNAL__ 45 #define __SDL_SOUND_INTERNAL__
46 #include "SDL_sound_internal.h" 46 #include "SDL_sound_internal.h"
47
48 /*
49 * libFLAC 1.0.1 added a seekable stream decoder, but if I understand the
50 * documentation correctly it's still much easier for us to handle the rewind
51 * method ourselves.
52 */
47 53
48 #include "FLAC/stream_decoder.h" 54 #include "FLAC/stream_decoder.h"
49 55
50 56
51 static int FLAC_init(void); 57 static int FLAC_init(void);
78 typedef struct 84 typedef struct
79 { 85 {
80 FLAC__StreamDecoder *decoder; 86 FLAC__StreamDecoder *decoder;
81 SDL_RWops *rw; 87 SDL_RWops *rw;
82 Sound_Sample *sample; 88 Sound_Sample *sample;
89 Uint32 data_starting_offset;
83 Uint32 frame_size; 90 Uint32 frame_size;
84 Uint8 is_flac; 91 Uint8 is_flac;
85 } flac_t; 92 } flac_t;
86 93
87 94
300 307
301 internal->decoder_private = f; 308 internal->decoder_private = f;
302 FLAC__stream_decoder_init(decoder); 309 FLAC__stream_decoder_init(decoder);
303 310
304 /* 311 /*
312 * Annoyingly, the rewind method will put the FLAC decoder in a state
313 * where it expects to read metadata, so we have to set this marker
314 * before the metadata block.
315 */
316 f->data_starting_offset = SDL_RWtell(f->rw);
317
318 /*
305 * If we are not sure this is a FLAC stream, check for the STREAMINFO 319 * If we are not sure this is a FLAC stream, check for the STREAMINFO
306 * metadata block. If not, we'd have to peek at the first audio frame 320 * metadata block. If not, we'd have to peek at the first audio frame
307 * and get the sound format from there, but that is not yet 321 * and get the sound format from there, but that is not yet
308 * implemented. 322 * implemented.
309 */ 323 */
340 { 354 {
341 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; 355 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
342 flac_t *f = (flac_t *) internal->decoder_private; 356 flac_t *f = (flac_t *) internal->decoder_private;
343 Uint32 len; 357 Uint32 len;
344 358
345 if (FLAC__stream_decoder_get_state(f->decoder) == FLAC__STREAM_DECODER_END_OF_STREAM)
346 {
347 sample->flags |= SOUND_SAMPLEFLAG_EOF;
348 return(0);
349 } /* if */
350
351 if (!FLAC__stream_decoder_process_one_frame(f->decoder)) 359 if (!FLAC__stream_decoder_process_one_frame(f->decoder))
352 { 360 {
353 Sound_SetError("FLAC: Couldn't decode frame."); 361 Sound_SetError("FLAC: Couldn't decode frame.");
354 sample->flags |= SOUND_SAMPLEFLAG_ERROR; 362 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
355 return(0); 363 return(0);
356 } /* if */ 364 } /* if */
357 365
366 if (FLAC__stream_decoder_get_state(f->decoder) == FLAC__STREAM_DECODER_END_OF_STREAM)
367 {
368 sample->flags |= SOUND_SAMPLEFLAG_EOF;
369 return(0);
370 } /* if */
371
358 /* An error may have been signalled through the error callback. */ 372 /* An error may have been signalled through the error callback. */
359 if (sample->flags & SOUND_SAMPLEFLAG_ERROR) 373 if (sample->flags & SOUND_SAMPLEFLAG_ERROR)
360 return(0); 374 return(0);
361 375
362 return(f->frame_size); 376 return(f->frame_size);
363 } /* FLAC_read */ 377 } /* FLAC_read */
364 378
365 379
366 static int FLAC_rewind(Sound_Sample *sample) 380 static int FLAC_rewind(Sound_Sample *sample)
367 { 381 {
368 /* !!! FIXME. */ 382 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
369 SNDDBG(("FLAC_rewind(): Write me!\n")); 383 flac_t *f = (flac_t *) internal->decoder_private;
370 assert(0); 384 int rc = SDL_RWseek(f->rw, f->data_starting_offset, SEEK_SET);
371 return(0); 385
386 BAIL_IF_MACRO(rc != f->data_starting_offset, ERR_IO_ERROR, 0);
387 BAIL_IF_MACRO(!FLAC__stream_decoder_reset(f->decoder),
388 "FLAC: could not reset decoder", 0);
389 FLAC__stream_decoder_process_metadata(f->decoder);
390 return(1);
372 } /* FLAC_rewind */ 391 } /* FLAC_rewind */
373 392
374 #endif /* SOUND_SUPPORTS_FLAC */ 393 #endif /* SOUND_SUPPORTS_FLAC */
375 394
376 395