/
music_flac.c
576 lines (495 loc) · 19.7 KB
1
/*
2
SDL_mixer: An audio mixer library based on the SDL library
3
Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
This file is used to support SDL_LoadMUS playback of FLAC files.
22
~ Austen Dicken (admin@cvpcs.org)
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
*/
#ifdef FLAC_MUSIC
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SDL_mixer.h"
#include "dynamic_flac.h"
#include "music_flac.h"
/* This is the format of the audio mixer data */
static SDL_AudioSpec mixer;
/* Initialize the FLAC player, with the given mixer settings
This function returns 0, or -1 if there was an error.
*/
41
42
int FLAC_init(SDL_AudioSpec *mixerfmt)
{
43
44
mixer = *mixerfmt;
return(0);
45
46
47
}
/* Set the volume for an FLAC stream */
48
49
void FLAC_setvolume(FLAC_music *music, int volume)
{
50
music->volume = volume;
51
52
53
}
static FLAC__StreamDecoderReadStatus flac_read_music_cb(
54
55
56
57
const FLAC__StreamDecoder *decoder,
FLAC__byte buffer[],
size_t *bytes,
void *client_data)
58
{
59
60
61
62
FLAC_music *data = (FLAC_music*)client_data;
// make sure there is something to be reading
if (*bytes > 0) {
63
*bytes = SDL_RWread (data->src, buffer, sizeof (FLAC__byte), *bytes);
64
65
66
if (*bytes == 0 ) { // error or no data was read (EOF)
return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
67
} else { // data was read, continue
68
69
return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
}
70
} else {
71
72
return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
}
73
74
75
}
static FLAC__StreamDecoderSeekStatus flac_seek_music_cb(
76
77
78
const FLAC__StreamDecoder *decoder,
FLAC__uint64 absolute_byte_offset,
void *client_data)
79
{
80
81
FLAC_music *data = (FLAC_music*)client_data;
82
if (SDL_RWseek (data->src, absolute_byte_offset, RW_SEEK_SET) < 0) {
83
return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
84
} else {
85
86
return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
}
87
88
89
}
static FLAC__StreamDecoderTellStatus flac_tell_music_cb(
90
91
92
const FLAC__StreamDecoder *decoder,
FLAC__uint64 *absolute_byte_offset,
void *client_data )
93
{
94
FLAC_music *data = (FLAC_music*)client_data;
95
96
Sint64 pos = SDL_RWtell (data->src);
97
98
99
if (pos < 0) {
return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
100
} else {
101
102
103
*absolute_byte_offset = (FLAC__uint64)pos;
return FLAC__STREAM_DECODER_TELL_STATUS_OK;
}
104
105
106
}
static FLAC__StreamDecoderLengthStatus flac_length_music_cb (
107
108
109
const FLAC__StreamDecoder *decoder,
FLAC__uint64 *stream_length,
void *client_data)
110
{
111
112
FLAC_music *data = (FLAC_music*)client_data;
113
114
Sint64 pos = SDL_RWtell (data->src);
Sint64 length = SDL_RWseek (data->src, 0, RW_SEEK_END);
115
116
if (SDL_RWseek (data->src, pos, RW_SEEK_SET) != pos || length < 0) {
117
118
119
/* there was an error attempting to return the stream to the original
* position, or the length was invalid. */
return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
120
} else {
121
122
123
*stream_length = (FLAC__uint64)length;
return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
}
124
125
126
}
static FLAC__bool flac_eof_music_cb(
127
128
const FLAC__StreamDecoder *decoder,
void *client_data )
129
{
130
131
FLAC_music *data = (FLAC_music*)client_data;
132
133
Sint64 pos = SDL_RWtell (data->src);
Sint64 end = SDL_RWseek (data->src, 0, RW_SEEK_END);
134
135
136
137
138
// was the original position equal to the end (a.k.a. the seek didn't move)?
if (pos == end) {
// must be EOF
return true;
139
} else {
140
// not EOF, return to the original position
141
SDL_RWseek (data->src, pos, RW_SEEK_SET);
142
143
return false;
}
144
145
146
}
static FLAC__StreamDecoderWriteStatus flac_write_music_cb(
147
148
149
150
const FLAC__StreamDecoder *decoder,
const FLAC__Frame *frame,
const FLAC__int32 *const buffer[],
void *client_data)
151
{
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
FLAC_music *data = (FLAC_music *)client_data;
size_t i;
if (data->flac_data.total_samples == 0) {
SDL_SetError ("Given FLAC file does not specify its sample count.");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if (data->flac_data.channels != 2 ||
data->flac_data.bits_per_sample != 16) {
SDL_SetError("Current FLAC support is only for 16 bit Stereo files.");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
for (i = 0; i < frame->header.blocksize; i++) {
FLAC__int16 i16;
FLAC__uint16 ui16;
// make sure we still have at least two bytes that can be read (one for
// each channel)
if (data->flac_data.max_to_read >= 4) {
// does the data block exist?
if (!data->flac_data.data) {
data->flac_data.data_len = data->flac_data.max_to_read;
data->flac_data.data_read = 0;
// create it
data->flac_data.data =
(char *)SDL_malloc (data->flac_data.data_len);
if (!data->flac_data.data) {
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
}
i16 = (FLAC__int16)buffer[0][i];
ui16 = (FLAC__uint16)i16;
*((data->flac_data.data) + (data->flac_data.data_read++)) =
(char)(ui16);
*((data->flac_data.data) + (data->flac_data.data_read++)) =
(char)(ui16 >> 8);
i16 = (FLAC__int16)buffer[1][i];
ui16 = (FLAC__uint16)i16;
*((data->flac_data.data) + (data->flac_data.data_read++)) =
(char)(ui16);
*((data->flac_data.data) + (data->flac_data.data_read++)) =
(char)(ui16 >> 8);
data->flac_data.max_to_read -= 4;
if (data->flac_data.max_to_read < 4) {
// we need to set this so that the read halts from the
// FLAC_getsome function.
data->flac_data.max_to_read = 0;
}
}
else {
// we need to write to the overflow
if (!data->flac_data.overflow) {
data->flac_data.overflow_len =
4 * (frame->header.blocksize - i);
data->flac_data.overflow_read = 0;
// make it big enough for the rest of the block
data->flac_data.overflow =
(char *)SDL_malloc (data->flac_data.overflow_len);
if (!data->flac_data.overflow) {
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
}
i16 = (FLAC__int16)buffer[0][i];
ui16 = (FLAC__uint16)i16;
*((data->flac_data.overflow) + (data->flac_data.overflow_read++)) =
(char)(ui16);
*((data->flac_data.overflow) + (data->flac_data.overflow_read++)) =
(char)(ui16 >> 8);
i16 = (FLAC__int16)buffer[1][i];
ui16 = (FLAC__uint16)i16;
*((data->flac_data.overflow) + (data->flac_data.overflow_read++)) =
(char)(ui16);
*((data->flac_data.overflow) + (data->flac_data.overflow_read++)) =
(char)(ui16 >> 8);
}
}
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
246
247
248
}
static void flac_metadata_music_cb(
249
250
251
const FLAC__StreamDecoder *decoder,
const FLAC__StreamMetadata *metadata,
void *client_data)
252
{
253
254
255
256
257
258
259
260
261
262
263
264
FLAC_music *data = (FLAC_music *)client_data;
if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
data->flac_data.sample_rate = metadata->data.stream_info.sample_rate;
data->flac_data.channels = metadata->data.stream_info.channels;
data->flac_data.total_samples =
metadata->data.stream_info.total_samples;
data->flac_data.bits_per_sample =
metadata->data.stream_info.bits_per_sample;
data->flac_data.sample_size = data->flac_data.channels *
((data->flac_data.bits_per_sample) / 8);
}
265
266
267
}
static void flac_error_music_cb(
268
269
270
const FLAC__StreamDecoder *decoder,
FLAC__StreamDecoderErrorStatus status,
void *client_data)
271
{
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
// print an SDL error based on the error status
switch (status) {
case FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC:
SDL_SetError ("Error processing the FLAC file [LOST_SYNC].");
break;
case FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER:
SDL_SetError ("Error processing the FLAC file [BAD_HEADER].");
break;
case FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH:
SDL_SetError ("Error processing the FLAC file [CRC_MISMATCH].");
break;
case FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM:
SDL_SetError ("Error processing the FLAC file [UNPARSEABLE].");
break;
default:
SDL_SetError ("Error processing the FLAC file [UNKNOWN].");
break;
}
290
291
292
}
/* Load an FLAC stream from an SDL_RWops object */
293
FLAC_music *FLAC_new_RW(SDL_RWops *src, int freesrc)
294
{
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
FLAC_music *music;
int init_stage = 0;
int was_error = 1;
if (!Mix_Init(MIX_INIT_FLAC)) {
return NULL;
}
music = (FLAC_music *)SDL_malloc ( sizeof (*music));
if (music) {
/* Initialize the music structure */
memset (music, 0, (sizeof (*music)));
FLAC_stop (music);
FLAC_setvolume (music, MIX_MAX_VOLUME);
music->section = -1;
310
311
music->src = src;
music->freesrc = freesrc;
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
music->flac_data.max_to_read = 0;
music->flac_data.overflow = NULL;
music->flac_data.overflow_len = 0;
music->flac_data.overflow_read = 0;
music->flac_data.data = NULL;
music->flac_data.data_len = 0;
music->flac_data.data_read = 0;
init_stage++; // stage 1!
music->flac_decoder = flac.FLAC__stream_decoder_new ();
if (music->flac_decoder != NULL) {
init_stage++; // stage 2!
if (flac.FLAC__stream_decoder_init_stream(
music->flac_decoder,
flac_read_music_cb, flac_seek_music_cb,
flac_tell_music_cb, flac_length_music_cb,
flac_eof_music_cb, flac_write_music_cb,
flac_metadata_music_cb, flac_error_music_cb,
music) == FLAC__STREAM_DECODER_INIT_STATUS_OK ) {
init_stage++; // stage 3!
if (flac.FLAC__stream_decoder_process_until_end_of_metadata
(music->flac_decoder)) {
was_error = 0;
} else {
SDL_SetError("FLAC__stream_decoder_process_until_end_of_metadata() failed");
}
} else {
SDL_SetError("FLAC__stream_decoder_init_stream() failed");
}
} else {
SDL_SetError("FLAC__stream_decoder_new() failed");
}
if (was_error) {
switch (init_stage) {
case 3:
flac.FLAC__stream_decoder_finish( music->flac_decoder );
case 2:
flac.FLAC__stream_decoder_delete( music->flac_decoder );
case 1:
case 0:
SDL_free(music);
break;
}
return NULL;
}
} else {
SDL_OutOfMemory();
return NULL;
}
return music;
368
369
370
}
/* Start playback of a given FLAC stream */
371
372
void FLAC_play(FLAC_music *music)
{
373
music->playing = 1;
374
375
376
}
/* Return non-zero if a stream is currently playing */
377
378
int FLAC_playing(FLAC_music *music)
{
379
return(music->playing);
380
381
382
}
/* Read some FLAC stream data and convert it for output */
383
384
static void FLAC_getsome(FLAC_music *music)
{
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
SDL_AudioCVT *cvt;
/* GET AUDIO WAVE DATA */
// set the max number of characters to read
music->flac_data.max_to_read = 8192;
music->flac_data.data_len = music->flac_data.max_to_read;
music->flac_data.data_read = 0;
if (!music->flac_data.data) {
music->flac_data.data = (char *)SDL_malloc (music->flac_data.data_len);
}
// we have data to read
while(music->flac_data.max_to_read > 0) {
// first check if there is data in the overflow from before
if (music->flac_data.overflow) {
size_t overflow_len = music->flac_data.overflow_read;
402
if (overflow_len > (size_t)music->flac_data.max_to_read) {
403
404
405
size_t overflow_extra_len = overflow_len -
music->flac_data.max_to_read;
406
SDL_memcpy (music->flac_data.data+music->flac_data.data_read,
407
408
music->flac_data.overflow, music->flac_data.max_to_read);
music->flac_data.data_read += music->flac_data.max_to_read;
409
SDL_memcpy (music->flac_data.overflow,
410
411
412
413
414
music->flac_data.overflow + music->flac_data.max_to_read,
overflow_extra_len);
music->flac_data.overflow_len = overflow_extra_len;
music->flac_data.overflow_read = overflow_extra_len;
music->flac_data.max_to_read = 0;
415
416
} else {
SDL_memcpy (music->flac_data.data+music->flac_data.data_read,
417
418
music->flac_data.overflow, overflow_len);
music->flac_data.data_read += overflow_len;
419
SDL_free (music->flac_data.overflow);
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
music->flac_data.overflow = NULL;
music->flac_data.overflow_len = 0;
music->flac_data.overflow_read = 0;
music->flac_data.max_to_read -= overflow_len;
}
}
else {
if (!flac.FLAC__stream_decoder_process_single (
music->flac_decoder)) {
music->flac_data.max_to_read = 0;
}
if (flac.FLAC__stream_decoder_get_state (music->flac_decoder)
== FLAC__STREAM_DECODER_END_OF_STREAM) {
music->flac_data.max_to_read = 0;
}
}
}
if (music->flac_data.data_read <= 0) {
if (music->flac_data.data_read == 0) {
music->playing = 0;
}
return;
}
cvt = &music->cvt;
if (music->section < 0) {
SDL_BuildAudioCVT (cvt, AUDIO_S16, (Uint8)music->flac_data.channels,
(int)music->flac_data.sample_rate, mixer.format,
mixer.channels, mixer.freq);
if (cvt->buf) {
451
SDL_free (cvt->buf);
452
453
454
455
456
}
cvt->buf = (Uint8 *)SDL_malloc (music->flac_data.data_len * cvt->len_mult);
music->section = 0;
}
if (cvt->buf) {
457
SDL_memcpy (cvt->buf, music->flac_data.data, music->flac_data.data_read);
458
459
460
461
462
463
464
465
466
467
468
469
470
471
if (cvt->needed) {
cvt->len = music->flac_data.data_read;
SDL_ConvertAudio (cvt);
}
else {
cvt->len_cvt = music->flac_data.data_read;
}
music->len_available = music->cvt.len_cvt;
music->snd_available = music->cvt.buf;
}
else {
SDL_SetError ("Out of memory");
music->playing = 0;
}
472
473
474
}
/* Play some of a stream previously started with FLAC_play() */
475
476
int FLAC_playAudio(FLAC_music *music, Uint8 *snd, int len)
{
477
478
479
480
481
482
483
484
485
486
487
int mixable;
while ((len > 0) && music->playing) {
if (!music->len_available) {
FLAC_getsome (music);
}
mixable = len;
if (mixable > music->len_available) {
mixable = music->len_available;
}
if (music->volume == MIX_MAX_VOLUME) {
488
SDL_memcpy (snd, music->snd_available, mixable);
489
490
491
492
493
494
495
496
497
498
499
}
else {
SDL_MixAudio (snd, music->snd_available, mixable, music->volume);
}
music->len_available -= mixable;
music->snd_available += mixable;
len -= mixable;
snd += mixable;
}
return len;
500
501
502
}
/* Stop playback of a stream previously started with FLAC_play() */
503
504
void FLAC_stop(FLAC_music *music)
{
505
music->playing = 0;
506
507
508
}
/* Close the given FLAC_music object */
509
510
void FLAC_delete(FLAC_music *music)
{
511
512
513
514
515
516
517
if (music) {
if (music->flac_decoder) {
flac.FLAC__stream_decoder_finish (music->flac_decoder);
flac.FLAC__stream_decoder_delete (music->flac_decoder);
}
if (music->flac_data.data) {
518
SDL_free (music->flac_data.data);
519
520
521
}
if (music->flac_data.overflow) {
522
SDL_free (music->flac_data.overflow);
523
524
525
}
if (music->cvt.buf) {
526
SDL_free (music->cvt.buf);
527
528
}
529
530
if (music->freesrc) {
SDL_RWclose(music->src);
531
}
532
SDL_free (music);
533
}
534
535
536
}
/* Jump (seek) to a given position (time is in seconds) */
537
538
void FLAC_jump_to_time(FLAC_music *music, double time)
{
539
540
541
542
543
544
if (music) {
if (music->flac_decoder) {
double seek_sample = music->flac_data.sample_rate * time;
// clear data if it has data
if (music->flac_data.data) {
545
SDL_free (music->flac_data.data);
546
547
548
549
550
music->flac_data.data = NULL;
}
// clear overflow if it has data
if (music->flac_data.overflow) {
551
SDL_free (music->flac_data.overflow);
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
music->flac_data.overflow = NULL;
}
if (!flac.FLAC__stream_decoder_seek_absolute (music->flac_decoder,
(FLAC__uint64)seek_sample)) {
if (flac.FLAC__stream_decoder_get_state (music->flac_decoder)
== FLAC__STREAM_DECODER_SEEK_ERROR) {
flac.FLAC__stream_decoder_flush (music->flac_decoder);
}
SDL_SetError
("Seeking of FLAC stream failed: libFLAC seek failed.");
}
}
else {
SDL_SetError
("Seeking of FLAC stream failed: FLAC decoder was NULL.");
}
}
else {
SDL_SetError ("Seeking of FLAC stream failed: music was NULL.");
}
574
575
576
}
#endif /* FLAC_MUSIC */