Repository navigation
Expand file tree
/
Copy pathminimp3_ex.h
More file actions
1394 lines (1322 loc) · 48.2 KB
/
Copy pathminimp3_ex.h
File metadata and controls
1394 lines (1322 loc) · 48.2 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
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
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
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
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
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
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#ifndef MINIMP3_EXT_H
#define MINIMP3_EXT_H
/*
https://github.com/lieff/minimp3
To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public domain worldwide.
This software is distributed without any warranty.
See <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#include "minimp3.h"
/* flags for mp3dec_ex_open_* functions */
#define MP3D_SEEK_TO_BYTE 0 /* mp3dec_ex_seek seeks to byte in stream */
#define MP3D_SEEK_TO_SAMPLE 1 /* mp3dec_ex_seek precisely seeks to sample using index (created during duration calculation scan or when mp3dec_ex_seek called) */
#define MP3D_DO_NOT_SCAN 2 /* do not scan whole stream for duration if vbrtag not found, mp3dec_ex_t::samples will be filled only if mp3dec_ex_t::vbr_tag_found == 1 */
#ifdef MINIMP3_ALLOW_MONO_STEREO_TRANSITION
#define MP3D_ALLOW_MONO_STEREO_TRANSITION 4
#define MP3D_FLAGS_MASK 7
#else
#define MP3D_FLAGS_MASK 3
#endif
/* compile-time config */
#define MINIMP3_PREDECODE_FRAMES 2 /* frames to pre-decode and skip after seek (to fill internal structures) */
/*#define MINIMP3_SEEK_IDX_LINEAR_SEARCH*/ /* define to use linear index search instead of binary search on seek */
#define MINIMP3_IO_SIZE (128*1024) /* io buffer size for streaming functions, must be greater than MINIMP3_BUF_SIZE */
#define MINIMP3_BUF_SIZE (16*1024) /* buffer which can hold minimum 10 consecutive mp3 frames (~16KB) worst case */
/*#define MINIMP3_SCAN_LIMIT (256*1024)*/ /* how many bytes will be scanned to search first valid mp3 frame, to prevent stall on large non-mp3 files */
#define MINIMP3_ENABLE_RING 0 /* WIP enable hardware magic ring buffer if available, to make less input buffer memmove(s) in callback IO mode */
/* return error codes */
#define MP3D_E_PARAM -1
#define MP3D_E_MEMORY -2
#define MP3D_E_IOERROR -3
#define MP3D_E_USER -4 /* can be used to stop processing from callbacks without indicating specific error */
#define MP3D_E_DECODE -5 /* decode error which can't be safely skipped, such as sample rate, layer and channels change */
typedef struct
{
mp3d_sample_t *buffer;
size_t samples; /* channels included, byte size = samples*sizeof(mp3d_sample_t) */
int channels, hz, layer, avg_bitrate_kbps;
} mp3dec_file_info_t;
typedef struct
{
const uint8_t *buffer;
size_t size;
} mp3dec_map_info_t;
typedef struct
{
uint64_t sample;
uint64_t offset;
} mp3dec_frame_t;
typedef struct
{
mp3dec_frame_t *frames;
size_t num_frames, capacity;
} mp3dec_index_t;
typedef size_t (*MP3D_READ_CB)(void *buf, size_t size, void *user_data);
typedef int (*MP3D_SEEK_CB)(uint64_t position, void *user_data);
typedef struct
{
MP3D_READ_CB read;
void *read_data;
MP3D_SEEK_CB seek;
void *seek_data;
} mp3dec_io_t;
typedef struct
{
mp3dec_t mp3d;
mp3dec_map_info_t file;
mp3dec_io_t *io;
mp3dec_index_t index;
uint64_t offset, samples, detected_samples, cur_sample, start_offset, end_offset;
mp3dec_frame_info_t info;
mp3d_sample_t buffer[MINIMP3_MAX_SAMPLES_PER_FRAME];
size_t input_consumed, input_filled;
int is_file, flags, vbr_tag_found, indexes_built;
int free_format_bytes;
int buffer_samples, buffer_consumed, to_skip, start_delay;
int last_error;
} mp3dec_ex_t;
typedef int (*MP3D_ITERATE_CB)(void *user_data, const uint8_t *frame, int frame_size, int free_format_bytes, size_t buf_size, uint64_t offset, mp3dec_frame_info_t *info);
typedef int (*MP3D_PROGRESS_CB)(void *user_data, size_t file_size, uint64_t offset, mp3dec_frame_info_t *info);
#ifdef __cplusplus
extern "C" {
#endif
/* detect mp3/mpa format */
int mp3dec_detect_buf(const uint8_t *buf, size_t buf_size);
int mp3dec_detect_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size);
/* decode whole buffer block */
int mp3dec_load_buf(mp3dec_t *dec, const uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
int mp3dec_load_cb(mp3dec_t *dec, mp3dec_io_t *io, uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
/* iterate through frames */
int mp3dec_iterate_buf(const uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data);
int mp3dec_iterate_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data);
/* streaming decoder with seeking capability */
int mp3dec_ex_open_buf(mp3dec_ex_t *dec, const uint8_t *buf, size_t buf_size, int flags);
int mp3dec_ex_open_cb(mp3dec_ex_t *dec, mp3dec_io_t *io, int flags);
void mp3dec_ex_close(mp3dec_ex_t *dec);
int mp3dec_ex_seek(mp3dec_ex_t *dec, uint64_t position);
size_t mp3dec_ex_read_frame(mp3dec_ex_t *dec, mp3d_sample_t **buf, mp3dec_frame_info_t *frame_info, size_t max_samples);
size_t mp3dec_ex_read(mp3dec_ex_t *dec, mp3d_sample_t *buf, size_t samples);
#ifndef MINIMP3_NO_STDIO
/* stdio versions of file detect, load, iterate and stream */
int mp3dec_detect(const char *file_name);
int mp3dec_load(mp3dec_t *dec, const char *file_name, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
int mp3dec_iterate(const char *file_name, MP3D_ITERATE_CB callback, void *user_data);
int mp3dec_ex_open(mp3dec_ex_t *dec, const char *file_name, int flags);
#ifdef _WIN32
int mp3dec_detect_w(const wchar_t *file_name);
int mp3dec_load_w(mp3dec_t *dec, const wchar_t *file_name, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
int mp3dec_iterate_w(const wchar_t *file_name, MP3D_ITERATE_CB callback, void *user_data);
int mp3dec_ex_open_w(mp3dec_ex_t *dec, const wchar_t *file_name, int flags);
#endif
#endif
#ifdef __cplusplus
}
#endif
#endif /*MINIMP3_EXT_H*/
#ifdef MINIMP3_IMPLEMENTATION
#include <limits.h>
static void mp3dec_skip_id3v1(const uint8_t *buf, size_t *pbuf_size)
{
size_t buf_size = *pbuf_size;
#ifndef MINIMP3_NOSKIP_ID3V1
if (buf_size >= 128 && !memcmp(buf + buf_size - 128, "TAG", 3))
{
buf_size -= 128;
if (buf_size >= 227 && !memcmp(buf + buf_size - 227, "TAG+", 4))
buf_size -= 227;
}
#endif
#ifndef MINIMP3_NOSKIP_APEV2
if (buf_size > 32 && !memcmp(buf + buf_size - 32, "APETAGEX", 8))
{
buf_size -= 32;
const uint8_t *tag = buf + buf_size + 8 + 4;
uint32_t tag_size = (uint32_t)(tag[3] << 24) | (tag[2] << 16) | (tag[1] << 8) | tag[0];
if (buf_size >= tag_size)
buf_size -= tag_size;
}
#endif
*pbuf_size = buf_size;
}
static size_t mp3dec_skip_id3v2(const uint8_t *buf, size_t buf_size)
{
#define MINIMP3_ID3_DETECT_SIZE 10
#ifndef MINIMP3_NOSKIP_ID3V2
if (buf_size >= MINIMP3_ID3_DETECT_SIZE && !memcmp(buf, "ID3", 3) && !((buf[5] & 15) || (buf[6] & 0x80) || (buf[7] & 0x80) || (buf[8] & 0x80) || (buf[9] & 0x80)))
{
size_t id3v2size = (((buf[6] & 0x7f) << 21) | ((buf[7] & 0x7f) << 14) | ((buf[8] & 0x7f) << 7) | (buf[9] & 0x7f)) + 10;
if ((buf[5] & 16))
id3v2size += 10; /* footer */
return id3v2size;
}
#endif
return 0;
}
static void mp3dec_skip_id3(const uint8_t **pbuf, size_t *pbuf_size)
{
uint8_t *buf = (uint8_t *)(*pbuf);
size_t buf_size = *pbuf_size;
size_t id3v2size = mp3dec_skip_id3v2(buf, buf_size);
if (id3v2size)
{
if (id3v2size >= buf_size)
id3v2size = buf_size;
buf += id3v2size;
buf_size -= id3v2size;
}
mp3dec_skip_id3v1(buf, &buf_size);
*pbuf = (const uint8_t *)buf;
*pbuf_size = buf_size;
}
static int mp3dec_check_vbrtag(const uint8_t *frame, int frame_size, uint32_t *frames, int *delay, int *padding)
{
static const char g_xing_tag[4] = { 'X', 'i', 'n', 'g' };
static const char g_info_tag[4] = { 'I', 'n', 'f', 'o' };
#define FRAMES_FLAG 1
#define BYTES_FLAG 2
#define TOC_FLAG 4
#define VBR_SCALE_FLAG 8
/* Side info offsets after header:
/ Mono Stereo
/ MPEG1 17 32
/ MPEG2 & 2.5 9 17*/
bs_t bs[1];
L3_gr_info_t gr_info[4];
bs_init(bs, frame + HDR_SIZE, frame_size - HDR_SIZE);
if (HDR_IS_CRC(frame))
get_bits(bs, 16);
if (L3_read_side_info(bs, gr_info, frame) < 0)
return 0; /* side info corrupted */
const uint8_t *tag = frame + HDR_SIZE + bs->pos/8;
if (memcmp(g_xing_tag, tag, 4) && memcmp(g_info_tag, tag, 4))
return 0;
int flags = tag[7];
if (!((flags & FRAMES_FLAG)))
return -1;
tag += 8;
*frames = (uint32_t)(tag[0] << 24) | (tag[1] << 16) | (tag[2] << 8) | tag[3];
tag += 4;
if (flags & BYTES_FLAG)
tag += 4;
if (flags & TOC_FLAG)
tag += 100;
if (flags & VBR_SCALE_FLAG)
tag += 4;
*delay = *padding = 0;
if (*tag)
{ /* extension, LAME, Lavc, etc. Should be the same structure. */
tag += 21;
if (tag - frame + 14 >= frame_size)
return 0;
*delay = ((tag[0] << 4) | (tag[1] >> 4)) + (528 + 1);
*padding = (((tag[1] & 0xF) << 8) | tag[2]) - (528 + 1);
}
return 1;
}
int mp3dec_detect_buf(const uint8_t *buf, size_t buf_size)
{
return mp3dec_detect_cb(0, (uint8_t *)buf, buf_size);
}
int mp3dec_detect_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size)
{
if (!buf || (size_t)-1 == buf_size || (io && buf_size < MINIMP3_BUF_SIZE))
return MP3D_E_PARAM;
size_t filled = buf_size;
if (io)
{
if (io->seek(0, io->seek_data))
return MP3D_E_IOERROR;
filled = io->read(buf, MINIMP3_ID3_DETECT_SIZE, io->read_data);
if (filled > MINIMP3_ID3_DETECT_SIZE)
return MP3D_E_IOERROR;
}
if (filled < MINIMP3_ID3_DETECT_SIZE)
return MP3D_E_USER; /* too small, can't be mp3/mpa */
if (mp3dec_skip_id3v2(buf, filled))
return 0; /* id3v2 tag is enough evidence */
if (io)
{
size_t readed = io->read(buf + MINIMP3_ID3_DETECT_SIZE, buf_size - MINIMP3_ID3_DETECT_SIZE, io->read_data);
if (readed > (buf_size - MINIMP3_ID3_DETECT_SIZE))
return MP3D_E_IOERROR;
filled += readed;
if (filled < MINIMP3_BUF_SIZE)
mp3dec_skip_id3v1(buf, &filled);
} else
{
mp3dec_skip_id3v1(buf, &filled);
if (filled > MINIMP3_BUF_SIZE)
filled = MINIMP3_BUF_SIZE;
}
int free_format_bytes, frame_size;
mp3d_find_frame(buf, filled, &free_format_bytes, &frame_size);
if (frame_size)
return 0; /* MAX_FRAME_SYNC_MATCHES consecutive frames found */
return MP3D_E_USER;
}
int mp3dec_load_buf(mp3dec_t *dec, const uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data)
{
return mp3dec_load_cb(dec, 0, (uint8_t *)buf, buf_size, info, progress_cb, user_data);
}
int mp3dec_load_cb(mp3dec_t *dec, mp3dec_io_t *io, uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data)
{
if (!dec || !buf || !info || (size_t)-1 == buf_size || (io && buf_size < MINIMP3_BUF_SIZE))
return MP3D_E_PARAM;
uint64_t detected_samples = 0;
size_t orig_buf_size = buf_size;
int to_skip = 0;
mp3dec_frame_info_t frame_info;
memset(info, 0, sizeof(*info));
memset(&frame_info, 0, sizeof(frame_info));
/* skip id3 */
size_t filled = 0, consumed = 0;
int eof = 0, ret = 0;
if (io)
{
if (io->seek(0, io->seek_data))
return MP3D_E_IOERROR;
filled = io->read(buf, MINIMP3_ID3_DETECT_SIZE, io->read_data);
if (filled > MINIMP3_ID3_DETECT_SIZE)
return MP3D_E_IOERROR;
if (MINIMP3_ID3_DETECT_SIZE != filled)
return 0;
size_t id3v2size = mp3dec_skip_id3v2(buf, filled);
if (id3v2size)
{
if (io->seek(id3v2size, io->seek_data))
return MP3D_E_IOERROR;
filled = io->read(buf, buf_size, io->read_data);
if (filled > buf_size)
return MP3D_E_IOERROR;
} else
{
size_t readed = io->read(buf + MINIMP3_ID3_DETECT_SIZE, buf_size - MINIMP3_ID3_DETECT_SIZE, io->read_data);
if (readed > (buf_size - MINIMP3_ID3_DETECT_SIZE))
return MP3D_E_IOERROR;
filled += readed;
}
if (filled < MINIMP3_BUF_SIZE)
mp3dec_skip_id3v1(buf, &filled);
} else
{
mp3dec_skip_id3((const uint8_t **)&buf, &buf_size);
if (!buf_size)
return 0;
}
/* try to make allocation size assumption by first frame or vbr tag */
mp3dec_init(dec);
int samples;
do
{
uint32_t frames;
int i, delay, padding, free_format_bytes = 0, frame_size = 0;
const uint8_t *hdr;
if (io)
{
if (!eof && filled - consumed < MINIMP3_BUF_SIZE)
{ /* keep minimum 10 consecutive mp3 frames (~16KB) worst case */
memmove(buf, buf + consumed, filled - consumed);
filled -= consumed;
consumed = 0;
size_t readed = io->read(buf + filled, buf_size - filled, io->read_data);
if (readed > (buf_size - filled))
return MP3D_E_IOERROR;
if (readed != (buf_size - filled))
eof = 1;
filled += readed;
if (eof)
mp3dec_skip_id3v1(buf, &filled);
}
i = mp3d_find_frame(buf + consumed, filled - consumed, &free_format_bytes, &frame_size);
consumed += i;
hdr = buf + consumed;
} else
{
i = mp3d_find_frame(buf, buf_size, &free_format_bytes, &frame_size);
buf += i;
buf_size -= i;
hdr = buf;
}
if (i && !frame_size)
continue;
if (!frame_size)
return 0;
frame_info.channels = HDR_IS_MONO(hdr) ? 1 : 2;
frame_info.hz = hdr_sample_rate_hz(hdr);
frame_info.layer = 4 - HDR_GET_LAYER(hdr);
frame_info.bitrate_kbps = hdr_bitrate_kbps(hdr);
frame_info.frame_bytes = frame_size;
samples = hdr_frame_samples(hdr)*frame_info.channels;
if (3 != frame_info.layer)
break;
int ret = mp3dec_check_vbrtag(hdr, frame_size, &frames, &delay, &padding);
if (ret > 0)
{
padding *= frame_info.channels;
to_skip = delay*frame_info.channels;
detected_samples = samples*(uint64_t)frames;
if (detected_samples >= (uint64_t)to_skip)
detected_samples -= to_skip;
if (padding > 0 && detected_samples >= (uint64_t)padding)
detected_samples -= padding;
if (!detected_samples)
return 0;
}
if (ret)
{
if (io)
{
consumed += frame_size;
} else
{
buf += frame_size;
buf_size -= frame_size;
}
}
break;
} while(1);
size_t allocated = MINIMP3_MAX_SAMPLES_PER_FRAME*sizeof(mp3d_sample_t);
if (detected_samples)
allocated += detected_samples*sizeof(mp3d_sample_t);
else
allocated += (buf_size/frame_info.frame_bytes)*samples*sizeof(mp3d_sample_t);
info->buffer = (mp3d_sample_t*)malloc(allocated);
if (!info->buffer)
return MP3D_E_MEMORY;
/* save info */
info->channels = frame_info.channels;
info->hz = frame_info.hz;
info->layer = frame_info.layer;
/* decode all frames */
size_t avg_bitrate_kbps = 0, frames = 0;
do
{
if ((allocated - info->samples*sizeof(mp3d_sample_t)) < MINIMP3_MAX_SAMPLES_PER_FRAME*sizeof(mp3d_sample_t))
{
allocated *= 2;
mp3d_sample_t *alloc_buf = (mp3d_sample_t*)realloc(info->buffer, allocated);
if (!alloc_buf)
return MP3D_E_MEMORY;
info->buffer = alloc_buf;
}
if (io)
{
if (!eof && filled - consumed < MINIMP3_BUF_SIZE)
{ /* keep minimum 10 consecutive mp3 frames (~16KB) worst case */
memmove(buf, buf + consumed, filled - consumed);
filled -= consumed;
consumed = 0;
size_t readed = io->read(buf + filled, buf_size - filled, io->read_data);
if (readed != (buf_size - filled))
eof = 1;
filled += readed;
if (eof)
mp3dec_skip_id3v1(buf, &filled);
}
samples = mp3dec_decode_frame(dec, buf + consumed, filled - consumed, info->buffer + info->samples, &frame_info);
consumed += frame_info.frame_bytes;
} else
{
samples = mp3dec_decode_frame(dec, buf, MINIMP3_MIN(buf_size, (size_t)INT_MAX), info->buffer + info->samples, &frame_info);
buf += frame_info.frame_bytes;
buf_size -= frame_info.frame_bytes;
}
if (samples)
{
if (info->hz != frame_info.hz || info->layer != frame_info.layer)
{
ret = MP3D_E_DECODE;
break;
}
if (info->channels && info->channels != frame_info.channels)
{
#ifdef MINIMP3_ALLOW_MONO_STEREO_TRANSITION
info->channels = 0; /* mark file with mono-stereo transition */
#else
ret = MP3D_E_DECODE;
break;
#endif
}
samples *= frame_info.channels;
if (to_skip)
{
size_t skip = MINIMP3_MIN(samples, to_skip);
to_skip -= skip;
samples -= skip;
memmove(info->buffer, info->buffer + skip, samples*sizeof(mp3d_sample_t));
}
info->samples += samples;
avg_bitrate_kbps += frame_info.bitrate_kbps;
frames++;
if (progress_cb)
{
ret = progress_cb(user_data, orig_buf_size, orig_buf_size - buf_size, &frame_info);
if (ret)
break;
}
}
} while (frame_info.frame_bytes);
if (detected_samples && info->samples > detected_samples)
info->samples = detected_samples; /* cut padding */
/* reallocate to normal buffer size */
if (allocated != info->samples*sizeof(mp3d_sample_t))
{
mp3d_sample_t *alloc_buf = (mp3d_sample_t*)realloc(info->buffer, info->samples*sizeof(mp3d_sample_t));
if (!alloc_buf && info->samples)
return MP3D_E_MEMORY;
info->buffer = alloc_buf;
}
if (frames)
info->avg_bitrate_kbps = avg_bitrate_kbps/frames;
return ret;
}
int mp3dec_iterate_buf(const uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data)
{
const uint8_t *orig_buf = buf;
if (!buf || (size_t)-1 == buf_size || !callback)
return MP3D_E_PARAM;
/* skip id3 */
mp3dec_skip_id3(&buf, &buf_size);
if (!buf_size)
return 0;
mp3dec_frame_info_t frame_info;
memset(&frame_info, 0, sizeof(frame_info));
do
{
int free_format_bytes = 0, frame_size = 0, ret;
int i = mp3d_find_frame(buf, buf_size, &free_format_bytes, &frame_size);
buf += i;
buf_size -= i;
if (i && !frame_size)
continue;
if (!frame_size)
break;
const uint8_t *hdr = buf;
frame_info.channels = HDR_IS_MONO(hdr) ? 1 : 2;
frame_info.hz = hdr_sample_rate_hz(hdr);
frame_info.layer = 4 - HDR_GET_LAYER(hdr);
frame_info.bitrate_kbps = hdr_bitrate_kbps(hdr);
frame_info.frame_bytes = frame_size;
if (callback)
{
if ((ret = callback(user_data, hdr, frame_size, free_format_bytes, buf_size, hdr - orig_buf, &frame_info)))
return ret;
}
buf += frame_size;
buf_size -= frame_size;
} while (1);
return 0;
}
int mp3dec_iterate_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data)
{
if (!io || !buf || (size_t)-1 == buf_size || buf_size < MINIMP3_BUF_SIZE || !callback)
return MP3D_E_PARAM;
size_t filled = io->read(buf, MINIMP3_ID3_DETECT_SIZE, io->read_data), consumed = 0;
uint64_t readed = 0;
mp3dec_frame_info_t frame_info;
int eof = 0;
memset(&frame_info, 0, sizeof(frame_info));
if (filled > MINIMP3_ID3_DETECT_SIZE)
return MP3D_E_IOERROR;
if (MINIMP3_ID3_DETECT_SIZE != filled)
return 0;
size_t id3v2size = mp3dec_skip_id3v2(buf, filled);
if (id3v2size)
{
if (io->seek(id3v2size, io->seek_data))
return MP3D_E_IOERROR;
filled = io->read(buf, buf_size, io->read_data);
if (filled > buf_size)
return MP3D_E_IOERROR;
readed += id3v2size;
} else
{
size_t readed = io->read(buf + MINIMP3_ID3_DETECT_SIZE, buf_size - MINIMP3_ID3_DETECT_SIZE, io->read_data);
if (readed > (buf_size - MINIMP3_ID3_DETECT_SIZE))
return MP3D_E_IOERROR;
filled += readed;
}
if (filled < MINIMP3_BUF_SIZE)
mp3dec_skip_id3v1(buf, &filled);
do
{
int free_format_bytes = 0, frame_size = 0, ret;
int i = mp3d_find_frame(buf + consumed, filled - consumed, &free_format_bytes, &frame_size);
if (i && !frame_size)
{
consumed += i;
continue;
}
if (!frame_size)
break;
const uint8_t *hdr = buf + consumed + i;
frame_info.channels = HDR_IS_MONO(hdr) ? 1 : 2;
frame_info.hz = hdr_sample_rate_hz(hdr);
frame_info.layer = 4 - HDR_GET_LAYER(hdr);
frame_info.bitrate_kbps = hdr_bitrate_kbps(hdr);
frame_info.frame_bytes = frame_size;
readed += i;
if (callback)
{
if ((ret = callback(user_data, hdr, frame_size, free_format_bytes, filled - consumed, readed, &frame_info)))
return ret;
}
readed += frame_size;
consumed += i + frame_size;
if (!eof && filled - consumed < MINIMP3_BUF_SIZE)
{ /* keep minimum 10 consecutive mp3 frames (~16KB) worst case */
memmove(buf, buf + consumed, filled - consumed);
filled -= consumed;
consumed = 0;
size_t readed = io->read(buf + filled, buf_size - filled, io->read_data);
if (readed > (buf_size - filled))
return MP3D_E_IOERROR;
if (readed != (buf_size - filled))
eof = 1;
filled += readed;
if (eof)
mp3dec_skip_id3v1(buf, &filled);
}
} while (1);
return 0;
}
static int mp3dec_load_index(void *user_data, const uint8_t *frame, int frame_size, int free_format_bytes, size_t buf_size, uint64_t offset, mp3dec_frame_info_t *info)
{
mp3dec_frame_t *idx_frame;
mp3dec_ex_t *dec = (mp3dec_ex_t *)user_data;
if (!dec->index.frames && !dec->start_offset)
{ /* detect VBR tag and try to avoid full scan */
uint32_t frames;
int delay, padding;
dec->info = *info;
dec->start_offset = dec->offset = offset;
dec->end_offset = offset + buf_size;
dec->free_format_bytes = free_format_bytes; /* should not change */
if (3 == dec->info.layer)
{
int ret = mp3dec_check_vbrtag(frame, frame_size, &frames, &delay, &padding);
if (ret)
dec->start_offset = dec->offset = offset + frame_size;
if (ret > 0)
{
padding *= info->channels;
dec->start_delay = dec->to_skip = delay*info->channels;
dec->samples = hdr_frame_samples(frame)*info->channels*(uint64_t)frames;
if (dec->samples >= (uint64_t)dec->start_delay)
dec->samples -= dec->start_delay;
if (padding > 0 && dec->samples >= (uint64_t)padding)
dec->samples -= padding;
dec->detected_samples = dec->samples;
dec->vbr_tag_found = 1;
return MP3D_E_USER;
} else if (ret < 0)
return 0;
}
}
if (dec->flags & MP3D_DO_NOT_SCAN)
return MP3D_E_USER;
if (dec->index.num_frames + 1 > dec->index.capacity)
{
if (!dec->index.capacity)
dec->index.capacity = 4096;
else
dec->index.capacity *= 2;
mp3dec_frame_t *alloc_buf = (mp3dec_frame_t *)realloc((void*)dec->index.frames, sizeof(mp3dec_frame_t)*dec->index.capacity);
if (!alloc_buf)
return MP3D_E_MEMORY;
dec->index.frames = alloc_buf;
}
idx_frame = &dec->index.frames[dec->index.num_frames++];
idx_frame->offset = offset;
idx_frame->sample = dec->samples;
if (!dec->buffer_samples && dec->index.num_frames < 256)
{ /* for some cutted mp3 frames, bit-reservoir not filled and decoding can't be started from first frames */
/* try to decode up to 255 first frames till samples starts to decode */
dec->buffer_samples = mp3dec_decode_frame(&dec->mp3d, frame, MINIMP3_MIN(buf_size, (size_t)INT_MAX), dec->buffer, info);
dec->samples += dec->buffer_samples*info->channels;
} else
dec->samples += hdr_frame_samples(frame)*info->channels;
return 0;
}
int mp3dec_ex_open_buf(mp3dec_ex_t *dec, const uint8_t *buf, size_t buf_size, int flags)
{
if (!dec || !buf || (size_t)-1 == buf_size || (flags & (~MP3D_FLAGS_MASK)))
return MP3D_E_PARAM;
memset(dec, 0, sizeof(*dec));
dec->file.buffer = buf;
dec->file.size = buf_size;
dec->flags = flags;
mp3dec_init(&dec->mp3d);
int ret = mp3dec_iterate_buf(dec->file.buffer, dec->file.size, mp3dec_load_index, dec);
if (ret && MP3D_E_USER != ret)
return ret;
mp3dec_init(&dec->mp3d);
dec->buffer_samples = 0;
dec->indexes_built = !(dec->vbr_tag_found || (flags & MP3D_DO_NOT_SCAN));
dec->flags &= (~MP3D_DO_NOT_SCAN);
return 0;
}
#ifndef MINIMP3_SEEK_IDX_LINEAR_SEARCH
static size_t mp3dec_idx_binary_search(mp3dec_index_t *idx, uint64_t position)
{
size_t end = idx->num_frames, start = 0, index = 0;
while (start <= end)
{
size_t mid = (start + end) / 2;
if (idx->frames[mid].sample >= position)
{ /* move left side. */
if (idx->frames[mid].sample == position)
return mid;
end = mid - 1;
} else
{ /* move to right side */
index = mid;
start = mid + 1;
if (start == idx->num_frames)
break;
}
}
return index;
}
#endif
int mp3dec_ex_seek(mp3dec_ex_t *dec, uint64_t position)
{
size_t i;
if (!dec)
return MP3D_E_PARAM;
if (!(dec->flags & MP3D_SEEK_TO_SAMPLE))
{
if (dec->io)
{
dec->offset = position;
} else
{
dec->offset = MINIMP3_MIN(position, dec->file.size);
}
dec->cur_sample = 0;
goto do_exit;
}
dec->cur_sample = position;
position += dec->start_delay;
if (0 == position)
{ /* optimize seek to zero, no index needed */
seek_zero:
dec->offset = dec->start_offset;
dec->to_skip = 0;
goto do_exit;
}
if (!dec->indexes_built)
{ /* no index created yet (vbr tag used to calculate track length or MP3D_DO_NOT_SCAN open flag used) */
dec->indexes_built = 1;
dec->samples = 0;
dec->buffer_samples = 0;
if (dec->io)
{
if (dec->io->seek(dec->start_offset, dec->io->seek_data))
return MP3D_E_IOERROR;
int ret = mp3dec_iterate_cb(dec->io, (uint8_t *)dec->file.buffer, dec->file.size, mp3dec_load_index, dec);
if (ret && MP3D_E_USER != ret)
return ret;
} else
{
int ret = mp3dec_iterate_buf(dec->file.buffer + dec->start_offset, dec->file.size - dec->start_offset, mp3dec_load_index, dec);
if (ret && MP3D_E_USER != ret)
return ret;
}
for (i = 0; i < dec->index.num_frames; i++)
dec->index.frames[i].offset += dec->start_offset;
dec->samples = dec->detected_samples;
}
if (!dec->index.frames)
goto seek_zero; /* no frames in file - seek to zero */
#ifdef MINIMP3_SEEK_IDX_LINEAR_SEARCH
for (i = 0; i < dec->index.num_frames; i++)
{
if (dec->index.frames[i].sample >= position)
break;
}
#else
i = mp3dec_idx_binary_search(&dec->index, position);
#endif
if (i)
{
int to_fill_bytes = 511;
int skip_frames = MINIMP3_PREDECODE_FRAMES
#ifdef MINIMP3_SEEK_IDX_LINEAR_SEARCH
+ ((dec->index.frames[i].sample == position) ? 0 : 1)
#endif
;
i -= MINIMP3_MIN(i, (size_t)skip_frames);
if (3 == dec->info.layer)
{
while (i && to_fill_bytes)
{ /* make sure bit-reservoir is filled when we start decoding */
bs_t bs[1];
L3_gr_info_t gr_info[4];
int frame_bytes, frame_size;
const uint8_t *hdr;
if (dec->io)
{
hdr = dec->file.buffer;
if (dec->io->seek(dec->index.frames[i - 1].offset, dec->io->seek_data))
return MP3D_E_IOERROR;
size_t readed = dec->io->read((uint8_t *)hdr, HDR_SIZE, dec->io->read_data);
if (readed != HDR_SIZE)
return MP3D_E_IOERROR;
frame_size = hdr_frame_bytes(hdr, dec->free_format_bytes) + hdr_padding(hdr);
readed = dec->io->read((uint8_t *)hdr + HDR_SIZE, frame_size - HDR_SIZE, dec->io->read_data);
if (readed != (size_t)(frame_size - HDR_SIZE))
return MP3D_E_IOERROR;
bs_init(bs, hdr + HDR_SIZE, frame_size - HDR_SIZE);
} else
{
hdr = dec->file.buffer + dec->index.frames[i - 1].offset;
frame_size = hdr_frame_bytes(hdr, dec->free_format_bytes) + hdr_padding(hdr);
bs_init(bs, hdr + HDR_SIZE, frame_size - HDR_SIZE);
}
if (HDR_IS_CRC(hdr))
get_bits(bs, 16);
i--;
if (L3_read_side_info(bs, gr_info, hdr) < 0)
break; /* frame not decodable, we can start from here */
frame_bytes = (bs->limit - bs->pos)/8;
to_fill_bytes -= MINIMP3_MIN(to_fill_bytes, frame_bytes);
}
}
}
dec->offset = dec->index.frames[i].offset;
dec->to_skip = position - dec->index.frames[i].sample;
while ((i + 1) < dec->index.num_frames && !dec->index.frames[i].sample && !dec->index.frames[i + 1].sample)
{ /* skip not decodable first frames */
const uint8_t *hdr;
if (dec->io)
{
hdr = dec->file.buffer;
if (dec->io->seek(dec->index.frames[i].offset, dec->io->seek_data))
return MP3D_E_IOERROR;
size_t readed = dec->io->read((uint8_t *)hdr, HDR_SIZE, dec->io->read_data);
if (readed != HDR_SIZE)
return MP3D_E_IOERROR;
} else
hdr = dec->file.buffer + dec->index.frames[i].offset;
dec->to_skip += hdr_frame_samples(hdr)*dec->info.channels;
i++;
}
do_exit:
if (dec->io)
{
if (dec->io->seek(dec->offset, dec->io->seek_data))
return MP3D_E_IOERROR;
}
dec->buffer_samples = 0;
dec->buffer_consumed = 0;
dec->input_consumed = 0;
dec->input_filled = 0;
dec->last_error = 0;
mp3dec_init(&dec->mp3d);
return 0;
}
size_t mp3dec_ex_read_frame(mp3dec_ex_t *dec, mp3d_sample_t **buf, mp3dec_frame_info_t *frame_info, size_t max_samples)
{
if (!dec || !buf || !frame_info)
{
if (dec)
dec->last_error = MP3D_E_PARAM;
return 0;
}
if (dec->detected_samples && dec->cur_sample >= dec->detected_samples)
return 0; /* at end of stream */
if (dec->last_error)
return 0; /* error eof state, seek can reset it */
*buf = NULL;
uint64_t end_offset = dec->end_offset ? dec->end_offset : dec->file.size;
int eof = 0;
while (dec->buffer_consumed == dec->buffer_samples)
{
const uint8_t *dec_buf;
if (dec->io)
{
if (!eof && (dec->input_filled - dec->input_consumed) < MINIMP3_BUF_SIZE)
{ /* keep minimum 10 consecutive mp3 frames (~16KB) worst case */
memmove((uint8_t*)dec->file.buffer, (uint8_t*)dec->file.buffer + dec->input_consumed, dec->input_filled - dec->input_consumed);
dec->input_filled -= dec->input_consumed;
dec->input_consumed = 0;
size_t readed = dec->io->read((uint8_t*)dec->file.buffer + dec->input_filled, dec->file.size - dec->input_filled, dec->io->read_data);
if (readed > (dec->file.size - dec->input_filled))
{
dec->last_error = MP3D_E_IOERROR;
readed = 0;
}
if (readed != (dec->file.size - dec->input_filled))
eof = 1;
dec->input_filled += readed;
if (eof)
mp3dec_skip_id3v1((uint8_t*)dec->file.buffer, &dec->input_filled);
}
dec_buf = dec->file.buffer + dec->input_consumed;
if (!(dec->input_filled - dec->input_consumed))
return 0;
dec->buffer_samples = mp3dec_decode_frame(&dec->mp3d, dec_buf, dec->input_filled - dec->input_consumed, dec->buffer, frame_info);
dec->input_consumed += frame_info->frame_bytes;
} else
{
dec_buf = dec->file.buffer + dec->offset;
uint64_t buf_size = end_offset - dec->offset;
if (!buf_size)
return 0;
dec->buffer_samples = mp3dec_decode_frame(&dec->mp3d, dec_buf, MINIMP3_MIN(buf_size, (uint64_t)INT_MAX), dec->buffer, frame_info);
}
dec->buffer_consumed = 0;
if (dec->info.hz != frame_info->hz || dec->info.layer != frame_info->layer)
{
return_e_decode:
dec->last_error = MP3D_E_DECODE;
return 0;
}
if (dec->buffer_samples)
{
dec->buffer_samples *= frame_info->channels;
if (dec->to_skip)
{
size_t skip = MINIMP3_MIN(dec->buffer_samples, dec->to_skip);
dec->buffer_consumed += skip;
dec->to_skip -= skip;
}
if (
#ifdef MINIMP3_ALLOW_MONO_STEREO_TRANSITION
!(dec->flags & MP3D_ALLOW_MONO_STEREO_TRANSITION) &&
#endif
dec->buffer_consumed != dec->buffer_samples && dec->info.channels != frame_info->channels)
{
goto return_e_decode;
}
} else if (dec->to_skip)
{ /* In mp3 decoding not always can start decode from any frame because of bit reservoir,
count skip samples for such frames */
int frame_samples = hdr_frame_samples(dec_buf)*frame_info->channels;
dec->to_skip -= MINIMP3_MIN(frame_samples, dec->to_skip);
}
dec->offset += frame_info->frame_bytes;
}
size_t out_samples = MINIMP3_MIN((size_t)(dec->buffer_samples - dec->buffer_consumed), max_samples);
if (dec->detected_samples)
{ /* count decoded samples to properly cut padding */
if (dec->cur_sample + out_samples >= dec->detected_samples)
out_samples = dec->detected_samples - dec->cur_sample;
}
dec->cur_sample += out_samples;
*buf = dec->buffer + dec->buffer_consumed;
dec->buffer_consumed += out_samples;
return out_samples;
}
size_t mp3dec_ex_read(mp3dec_ex_t *dec, mp3d_sample_t *buf, size_t samples)
{
if (!dec || !buf)
{
if (dec)
dec->last_error = MP3D_E_PARAM;
return 0;
}
mp3dec_frame_info_t frame_info;
memset(&frame_info, 0, sizeof(frame_info));
size_t samples_requested = samples;
while (samples)
{
mp3d_sample_t *buf_frame = NULL;
size_t read_samples = mp3dec_ex_read_frame(dec, &buf_frame, &frame_info, samples);
if (!read_samples)
{
break;
}
memcpy(buf, buf_frame, read_samples * sizeof(mp3d_sample_t));
buf += read_samples;
samples -= read_samples;
}
return samples_requested - samples;
}
int mp3dec_ex_open_cb(mp3dec_ex_t *dec, mp3dec_io_t *io, int flags)
{
if (!dec || !io || (flags & (~MP3D_FLAGS_MASK)))
return MP3D_E_PARAM;
memset(dec, 0, sizeof(*dec));
#ifdef MINIMP3_HAVE_RING
int ret;
if (ret = mp3dec_open_ring(&dec->file, MINIMP3_IO_SIZE))
return ret;
#else
dec->file.size = MINIMP3_IO_SIZE;
dec->file.buffer = (const uint8_t*)malloc(dec->file.size);
if (!dec->file.buffer)
return MP3D_E_MEMORY;
#endif
dec->flags = flags;
dec->io = io;
mp3dec_init(&dec->mp3d);
if (io->seek(0, io->seek_data))
return MP3D_E_IOERROR;
int ret = mp3dec_iterate_cb(io, (uint8_t *)dec->file.buffer, dec->file.size, mp3dec_load_index, dec);
if (ret && MP3D_E_USER != ret)
return ret;
if (dec->io->seek(dec->start_offset, dec->io->seek_data))
return MP3D_E_IOERROR;
mp3dec_init(&dec->mp3d);
dec->buffer_samples = 0;
dec->indexes_built = !(dec->vbr_tag_found || (flags & MP3D_DO_NOT_SCAN));