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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
|
/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avassert.h"
#include "libavutil/dict.h"
#include "libavutil/error.h"
#include "libavutil/log.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "libavutil/time.h"
#include "libavutil/timestamp.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/codec.h"
#include "libavfilter/buffersrc.h"
#include "ffmpeg.h"
#include "ffmpeg_utils.h"
#include "thread_queue.h"
typedef struct DecoderPriv {
Decoder dec;
AVCodecContext *dec_ctx;
AVFrame *frame;
AVPacket *pkt;
// override output video sample aspect ratio with this value
AVRational sar_override;
AVRational framerate_in;
// a combination of DECODER_FLAG_*, provided to dec_open()
int flags;
enum AVPixelFormat hwaccel_pix_fmt;
enum HWAccelID hwaccel_id;
enum AVHWDeviceType hwaccel_device_type;
enum AVPixelFormat hwaccel_output_format;
// pts/estimated duration of the last decoded frame
// * in decoder timebase for video,
// * in last_frame_tb (may change during decoding) for audio
int64_t last_frame_pts;
int64_t last_frame_duration_est;
AVRational last_frame_tb;
int64_t last_filter_in_rescale_delta;
int last_frame_sample_rate;
/* previous decoded subtitles */
AVFrame *sub_prev[2];
AVFrame *sub_heartbeat;
Scheduler *sch;
unsigned sch_idx;
void *log_parent;
char log_name[32];
char *parent_name;
} DecoderPriv;
static DecoderPriv *dp_from_dec(Decoder *d)
{
return (DecoderPriv*)d;
}
// data that is local to the decoder thread and not visible outside of it
typedef struct DecThreadContext {
AVFrame *frame;
AVPacket *pkt;
} DecThreadContext;
void dec_free(Decoder **pdec)
{
Decoder *dec = *pdec;
DecoderPriv *dp;
if (!dec)
return;
dp = dp_from_dec(dec);
avcodec_free_context(&dp->dec_ctx);
av_frame_free(&dp->frame);
av_packet_free(&dp->pkt);
for (int i = 0; i < FF_ARRAY_ELEMS(dp->sub_prev); i++)
av_frame_free(&dp->sub_prev[i]);
av_frame_free(&dp->sub_heartbeat);
av_freep(&dp->parent_name);
av_freep(pdec);
}
static int dec_alloc(Decoder **pdec)
{
DecoderPriv *dp;
*pdec = NULL;
dp = av_mallocz(sizeof(*dp));
if (!dp)
return AVERROR(ENOMEM);
dp->frame = av_frame_alloc();
if (!dp->frame)
goto fail;
dp->pkt = av_packet_alloc();
if (!dp->pkt)
goto fail;
dp->last_filter_in_rescale_delta = AV_NOPTS_VALUE;
dp->last_frame_pts = AV_NOPTS_VALUE;
dp->last_frame_tb = (AVRational){ 1, 1 };
dp->hwaccel_pix_fmt = AV_PIX_FMT_NONE;
*pdec = &dp->dec;
return 0;
fail:
dec_free((Decoder**)&dp);
return AVERROR(ENOMEM);
}
static AVRational audio_samplerate_update(DecoderPriv *dp,
const AVFrame *frame)
{
const int prev = dp->last_frame_tb.den;
const int sr = frame->sample_rate;
AVRational tb_new;
int64_t gcd;
if (frame->sample_rate == dp->last_frame_sample_rate)
goto finish;
gcd = av_gcd(prev, sr);
if (prev / gcd >= INT_MAX / sr) {
av_log(dp, AV_LOG_WARNING,
"Audio timestamps cannot be represented exactly after "
"sample rate change: %d -> %d\n", prev, sr);
// LCM of 192000, 44100, allows to represent all common samplerates
tb_new = (AVRational){ 1, 28224000 };
} else
tb_new = (AVRational){ 1, prev / gcd * sr };
// keep the frame timebase if it is strictly better than
// the samplerate-defined one
if (frame->time_base.num == 1 && frame->time_base.den > tb_new.den &&
!(frame->time_base.den % tb_new.den))
tb_new = frame->time_base;
if (dp->last_frame_pts != AV_NOPTS_VALUE)
dp->last_frame_pts = av_rescale_q(dp->last_frame_pts,
dp->last_frame_tb, tb_new);
dp->last_frame_duration_est = av_rescale_q(dp->last_frame_duration_est,
dp->last_frame_tb, tb_new);
dp->last_frame_tb = tb_new;
dp->last_frame_sample_rate = frame->sample_rate;
finish:
return dp->last_frame_tb;
}
static void audio_ts_process(DecoderPriv *dp, AVFrame *frame)
{
AVRational tb_filter = (AVRational){1, frame->sample_rate};
AVRational tb;
int64_t pts_pred;
// on samplerate change, choose a new internal timebase for timestamp
// generation that can represent timestamps from all the samplerates
// seen so far
tb = audio_samplerate_update(dp, frame);
pts_pred = dp->last_frame_pts == AV_NOPTS_VALUE ? 0 :
dp->last_frame_pts + dp->last_frame_duration_est;
if (frame->pts == AV_NOPTS_VALUE) {
frame->pts = pts_pred;
frame->time_base = tb;
} else if (dp->last_frame_pts != AV_NOPTS_VALUE &&
frame->pts > av_rescale_q_rnd(pts_pred, tb, frame->time_base,
AV_ROUND_UP)) {
// there was a gap in timestamps, reset conversion state
dp->last_filter_in_rescale_delta = AV_NOPTS_VALUE;
}
frame->pts = av_rescale_delta(frame->time_base, frame->pts,
tb, frame->nb_samples,
&dp->last_filter_in_rescale_delta, tb);
dp->last_frame_pts = frame->pts;
dp->last_frame_duration_est = av_rescale_q(frame->nb_samples,
tb_filter, tb);
// finally convert to filtering timebase
frame->pts = av_rescale_q(frame->pts, tb, tb_filter);
frame->duration = frame->nb_samples;
frame->time_base = tb_filter;
}
static int64_t video_duration_estimate(const InputStream *ist, const AVFrame *frame)
{
const DecoderPriv *dp = dp_from_dec(ist->decoder);
const int ts_unreliable = dp->flags & DECODER_FLAG_TS_UNRELIABLE;
const int fr_forced = dp->flags & DECODER_FLAG_FRAMERATE_FORCED;
int64_t codec_duration = 0;
// XXX lavf currently makes up frame durations when they are not provided by
// the container. As there is no way to reliably distinguish real container
// durations from the fake made-up ones, we use heuristics based on whether
// the container has timestamps. Eventually lavf should stop making up
// durations, then this should be simplified.
// prefer frame duration for containers with timestamps
if (frame->duration > 0 && (!ts_unreliable || fr_forced))
return frame->duration;
if (dp->dec_ctx->framerate.den && dp->dec_ctx->framerate.num) {
int fields = frame->repeat_pict + 2;
AVRational field_rate = av_mul_q(dp->dec_ctx->framerate,
(AVRational){ 2, 1 });
codec_duration = av_rescale_q(fields, av_inv_q(field_rate),
frame->time_base);
}
// prefer codec-layer duration for containers without timestamps
if (codec_duration > 0 && ts_unreliable)
return codec_duration;
// when timestamps are available, repeat last frame's actual duration
// (i.e. pts difference between this and last frame)
if (frame->pts != AV_NOPTS_VALUE && dp->last_frame_pts != AV_NOPTS_VALUE &&
frame->pts > dp->last_frame_pts)
return frame->pts - dp->last_frame_pts;
// try frame/codec duration
if (frame->duration > 0)
return frame->duration;
if (codec_duration > 0)
return codec_duration;
// try average framerate
if (dp->framerate_in.num && dp->framerate_in.den) {
int64_t d = av_rescale_q(1, av_inv_q(dp->framerate_in),
frame->time_base);
if (d > 0)
return d;
}
// last resort is last frame's estimated duration, and 1
return FFMAX(dp->last_frame_duration_est, 1);
}
static int hwaccel_retrieve_data(AVCodecContext *avctx, AVFrame *input)
{
DecoderPriv *dp = avctx->opaque;
AVFrame *output = NULL;
enum AVPixelFormat output_format = dp->hwaccel_output_format;
int err;
if (input->format == output_format) {
// Nothing to do.
return 0;
}
output = av_frame_alloc();
if (!output)
return AVERROR(ENOMEM);
output->format = output_format;
err = av_hwframe_transfer_data(output, input, 0);
if (err < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to transfer data to "
"output frame: %d.\n", err);
goto fail;
}
err = av_frame_copy_props(output, input);
if (err < 0) {
av_frame_unref(output);
goto fail;
}
av_frame_unref(input);
av_frame_move_ref(input, output);
av_frame_free(&output);
return 0;
fail:
av_frame_free(&output);
return err;
}
static int video_frame_process(InputStream *ist, AVFrame *frame)
{
DecoderPriv *dp = dp_from_dec(ist->decoder);
#if FFMPEG_OPT_TOP
if (dp->flags & DECODER_FLAG_TOP_FIELD_FIRST) {
av_log(dp, AV_LOG_WARNING, "-top is deprecated, use the setfield filter instead\n");
frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
}
#endif
if (frame->format == dp->hwaccel_pix_fmt) {
int err = hwaccel_retrieve_data(dp->dec_ctx, frame);
if (err < 0)
return err;
}
frame->pts = frame->best_effort_timestamp;
// forced fixed framerate
if (dp->flags & DECODER_FLAG_FRAMERATE_FORCED) {
frame->pts = AV_NOPTS_VALUE;
frame->duration = 1;
frame->time_base = av_inv_q(dp->framerate_in);
}
// no timestamp available - extrapolate from previous frame duration
if (frame->pts == AV_NOPTS_VALUE)
frame->pts = dp->last_frame_pts == AV_NOPTS_VALUE ? 0 :
dp->last_frame_pts + dp->last_frame_duration_est;
// update timestamp history
dp->last_frame_duration_est = video_duration_estimate(ist, frame);
dp->last_frame_pts = frame->pts;
dp->last_frame_tb = frame->time_base;
if (debug_ts) {
av_log(dp, AV_LOG_INFO,
"decoder -> pts:%s pts_time:%s "
"pkt_dts:%s pkt_dts_time:%s "
"duration:%s duration_time:%s "
"keyframe:%d frame_type:%d time_base:%d/%d\n",
av_ts2str(frame->pts),
av_ts2timestr(frame->pts, &frame->time_base),
av_ts2str(frame->pkt_dts),
av_ts2timestr(frame->pkt_dts, &frame->time_base),
av_ts2str(frame->duration),
av_ts2timestr(frame->duration, &frame->time_base),
!!(frame->flags & AV_FRAME_FLAG_KEY), frame->pict_type,
frame->time_base.num, frame->time_base.den);
}
if (dp->sar_override.num)
frame->sample_aspect_ratio = dp->sar_override;
return 0;
}
static int process_subtitle(InputStream *ist, AVFrame *frame)
{
DecoderPriv *dp = dp_from_dec(ist->decoder);
const AVSubtitle *subtitle = (AVSubtitle*)frame->buf[0]->data;
int ret = 0;
if (dp->flags & DECODER_FLAG_FIX_SUB_DURATION) {
AVSubtitle *sub_prev = dp->sub_prev[0]->buf[0] ?
(AVSubtitle*)dp->sub_prev[0]->buf[0]->data : NULL;
int end = 1;
if (sub_prev) {
end = av_rescale(subtitle->pts - sub_prev->pts,
1000, AV_TIME_BASE);
if (end < sub_prev->end_display_time) {
av_log(dp, AV_LOG_DEBUG,
"Subtitle duration reduced from %"PRId32" to %d%s\n",
sub_prev->end_display_time, end,
end <= 0 ? ", dropping it" : "");
sub_prev->end_display_time = end;
}
}
av_frame_unref(dp->sub_prev[1]);
av_frame_move_ref(dp->sub_prev[1], frame);
frame = dp->sub_prev[0];
subtitle = frame->buf[0] ? (AVSubtitle*)frame->buf[0]->data : NULL;
FFSWAP(AVFrame*, dp->sub_prev[0], dp->sub_prev[1]);
if (end <= 0)
return 0;
}
if (!subtitle)
return 0;
ret = sch_dec_send(dp->sch, dp->sch_idx, frame);
if (ret < 0)
av_frame_unref(frame);
return ret == AVERROR_EOF ? AVERROR_EXIT : ret;
}
static int fix_sub_duration_heartbeat(InputStream *ist, int64_t signal_pts)
{
DecoderPriv *dp = dp_from_dec(ist->decoder);
int ret = AVERROR_BUG;
AVSubtitle *prev_subtitle = dp->sub_prev[0]->buf[0] ?
(AVSubtitle*)dp->sub_prev[0]->buf[0]->data : NULL;
AVSubtitle *subtitle;
if (!(dp->flags & DECODER_FLAG_FIX_SUB_DURATION) || !prev_subtitle ||
!prev_subtitle->num_rects || signal_pts <= prev_subtitle->pts)
return 0;
av_frame_unref(dp->sub_heartbeat);
ret = subtitle_wrap_frame(dp->sub_heartbeat, prev_subtitle, 1);
if (ret < 0)
return ret;
subtitle = (AVSubtitle*)dp->sub_heartbeat->buf[0]->data;
subtitle->pts = signal_pts;
return process_subtitle(ist, dp->sub_heartbeat);
}
static int transcode_subtitles(InputStream *ist, const AVPacket *pkt,
AVFrame *frame)
{
DecoderPriv *dp = dp_from_dec(ist->decoder);
AVPacket *flush_pkt = NULL;
AVSubtitle subtitle;
int got_output;
int ret;
if (pkt && (intptr_t)pkt->opaque == PKT_OPAQUE_SUB_HEARTBEAT) {
frame->pts = pkt->pts;
frame->time_base = pkt->time_base;
frame->opaque = (void*)(intptr_t)FRAME_OPAQUE_SUB_HEARTBEAT;
ret = sch_dec_send(dp->sch, dp->sch_idx, frame);
return ret == AVERROR_EOF ? AVERROR_EXIT : ret;
} else if (pkt && (intptr_t)pkt->opaque == PKT_OPAQUE_FIX_SUB_DURATION) {
return fix_sub_duration_heartbeat(ist, av_rescale_q(pkt->pts, pkt->time_base,
AV_TIME_BASE_Q));
}
if (!pkt) {
flush_pkt = av_packet_alloc();
if (!flush_pkt)
return AVERROR(ENOMEM);
}
ret = avcodec_decode_subtitle2(dp->dec_ctx, &subtitle, &got_output,
pkt ? pkt : flush_pkt);
av_packet_free(&flush_pkt);
if (ret < 0) {
av_log(dp, AV_LOG_ERROR, "Error decoding subtitles: %s\n",
av_err2str(ret));
dp->dec.decode_errors++;
return exit_on_error ? ret : 0;
}
if (!got_output)
return pkt ? 0 : AVERROR_EOF;
dp->dec.frames_decoded++;
// XXX the queue for transferring data to consumers runs
// on AVFrames, so we wrap AVSubtitle in an AVBufferRef and put that
// inside the frame
// eventually, subtitles should be switched to use AVFrames natively
ret = subtitle_wrap_frame(frame, &subtitle, 0);
if (ret < 0) {
avsubtitle_free(&subtitle);
return ret;
}
frame->width = dp->dec_ctx->width;
frame->height = dp->dec_ctx->height;
return process_subtitle(ist, frame);
}
static int packet_decode(InputStream *ist, AVPacket *pkt, AVFrame *frame)
{
DecoderPriv *dp = dp_from_dec(ist->decoder);
AVCodecContext *dec = dp->dec_ctx;
const char *type_desc = av_get_media_type_string(dec->codec_type);
int ret;
if (dec->codec_type == AVMEDIA_TYPE_SUBTITLE)
return transcode_subtitles(ist, pkt, frame);
// With fate-indeo3-2, we're getting 0-sized packets before EOF for some
// reason. This seems like a semi-critical bug. Don't trigger EOF, and
// skip the packet.
if (pkt && pkt->size == 0)
return 0;
if (pkt && (dp->flags & DECODER_FLAG_TS_UNRELIABLE)) {
pkt->pts = AV_NOPTS_VALUE;
pkt->dts = AV_NOPTS_VALUE;
}
if (pkt) {
FrameData *fd = packet_data(pkt);
if (!fd)
return AVERROR(ENOMEM);
fd->wallclock[LATENCY_PROBE_DEC_PRE] = av_gettime_relative();
}
ret = avcodec_send_packet(dec, pkt);
if (ret < 0 && !(ret == AVERROR_EOF && !pkt)) {
// In particular, we don't expect AVERROR(EAGAIN), because we read all
// decoded frames with avcodec_receive_frame() until done.
if (ret == AVERROR(EAGAIN)) {
av_log(dp, AV_LOG_FATAL, "A decoder returned an unexpected error code. "
"This is a bug, please report it.\n");
return AVERROR_BUG;
}
av_log(dp, AV_LOG_ERROR, "Error submitting %s to decoder: %s\n",
pkt ? "packet" : "EOF", av_err2str(ret));
if (ret != AVERROR_EOF) {
dp->dec.decode_errors++;
if (!exit_on_error)
ret = 0;
}
return ret;
}
while (1) {
FrameData *fd;
av_frame_unref(frame);
update_benchmark(NULL);
ret = avcodec_receive_frame(dec, frame);
update_benchmark("decode_%s %s", type_desc, dp->parent_name);
if (ret == AVERROR(EAGAIN)) {
av_assert0(pkt); // should never happen during flushing
return 0;
} else if (ret == AVERROR_EOF) {
return ret;
} else if (ret < 0) {
av_log(dp, AV_LOG_ERROR, "Decoding error: %s\n", av_err2str(ret));
dp->dec.decode_errors++;
if (exit_on_error)
return ret;
continue;
}
if (frame->decode_error_flags || (frame->flags & AV_FRAME_FLAG_CORRUPT)) {
av_log(dp, exit_on_error ? AV_LOG_FATAL : AV_LOG_WARNING,
"corrupt decoded frame\n");
if (exit_on_error)
return AVERROR_INVALIDDATA;
}
fd = frame_data(frame);
if (!fd) {
av_frame_unref(frame);
return AVERROR(ENOMEM);
}
fd->dec.pts = frame->pts;
fd->dec.tb = dec->pkt_timebase;
fd->dec.frame_num = dec->frame_num - 1;
fd->bits_per_raw_sample = dec->bits_per_raw_sample;
fd->wallclock[LATENCY_PROBE_DEC_POST] = av_gettime_relative();
frame->time_base = dec->pkt_timebase;
if (dec->codec_type == AVMEDIA_TYPE_AUDIO) {
dp->dec.samples_decoded += frame->nb_samples;
audio_ts_process(dp, frame);
} else {
ret = video_frame_process(ist, frame);
if (ret < 0) {
av_log(dp, AV_LOG_FATAL,
"Error while processing the decoded data\n");
return ret;
}
}
dp->dec.frames_decoded++;
ret = sch_dec_send(dp->sch, dp->sch_idx, frame);
if (ret < 0) {
av_frame_unref(frame);
return ret == AVERROR_EOF ? AVERROR_EXIT : ret;
}
}
}
static void dec_thread_set_name(const DecoderPriv *dp)
{
char name[16];
snprintf(name, sizeof(name), "dec%s:%s", dp->parent_name,
dp->dec_ctx->codec->name);
ff_thread_setname(name);
}
static void dec_thread_uninit(DecThreadContext *dt)
{
av_packet_free(&dt->pkt);
av_frame_free(&dt->frame);
memset(dt, 0, sizeof(*dt));
}
static int dec_thread_init(DecThreadContext *dt)
{
memset(dt, 0, sizeof(*dt));
dt->frame = av_frame_alloc();
if (!dt->frame)
goto fail;
dt->pkt = av_packet_alloc();
if (!dt->pkt)
goto fail;
return 0;
fail:
dec_thread_uninit(dt);
return AVERROR(ENOMEM);
}
void *decoder_thread(void *arg)
{
InputStream *ist = arg;
DecoderPriv *dp = dp_from_dec(ist->decoder);
DecThreadContext dt;
int ret = 0, input_status = 0;
ret = dec_thread_init(&dt);
if (ret < 0)
goto finish;
dec_thread_set_name(dp);
while (!input_status) {
int flush_buffers, have_data;
input_status = sch_dec_receive(dp->sch, dp->sch_idx, dt.pkt);
have_data = input_status >= 0 &&
(dt.pkt->buf || dt.pkt->side_data_elems ||
(intptr_t)dt.pkt->opaque == PKT_OPAQUE_SUB_HEARTBEAT ||
(intptr_t)dt.pkt->opaque == PKT_OPAQUE_FIX_SUB_DURATION);
flush_buffers = input_status >= 0 && !have_data;
if (!have_data)
av_log(dp, AV_LOG_VERBOSE, "Decoder thread received %s packet\n",
flush_buffers ? "flush" : "EOF");
ret = packet_decode(ist, have_data ? dt.pkt : NULL, dt.frame);
av_packet_unref(dt.pkt);
av_frame_unref(dt.frame);
// AVERROR_EOF - EOF from the decoder
// AVERROR_EXIT - EOF from the scheduler
// we treat them differently when flushing
if (ret == AVERROR_EXIT) {
ret = AVERROR_EOF;
flush_buffers = 0;
}
if (ret == AVERROR_EOF) {
av_log(dp, AV_LOG_VERBOSE, "Decoder returned EOF, %s\n",
flush_buffers ? "resetting" : "finishing");
if (!flush_buffers)
break;
/* report last frame duration to the scheduler */
if (ist->dec->type == AVMEDIA_TYPE_AUDIO) {
dt.pkt->pts = dp->last_frame_pts + dp->last_frame_duration_est;
dt.pkt->time_base = dp->last_frame_tb;
}
avcodec_flush_buffers(dp->dec_ctx);
} else if (ret < 0) {
av_log(dp, AV_LOG_ERROR, "Error processing packet in decoder: %s\n",
av_err2str(ret));
break;
}
}
// EOF is normal thread termination
if (ret == AVERROR_EOF)
ret = 0;
// on success send EOF timestamp to our downstreams
if (ret >= 0) {
float err_rate;
av_frame_unref(dt.frame);
dt.frame->opaque = (void*)(intptr_t)FRAME_OPAQUE_EOF;
dt.frame->pts = dp->last_frame_pts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE :
dp->last_frame_pts + dp->last_frame_duration_est;
dt.frame->time_base = dp->last_frame_tb;
ret = sch_dec_send(dp->sch, dp->sch_idx, dt.frame);
if (ret < 0 && ret != AVERROR_EOF) {
av_log(dp, AV_LOG_FATAL,
"Error signalling EOF timestamp: %s\n", av_err2str(ret));
goto finish;
}
ret = 0;
err_rate = (dp->dec.frames_decoded || dp->dec.decode_errors) ?
dp->dec.decode_errors / (dp->dec.frames_decoded + dp->dec.decode_errors) : 0.f;
if (err_rate > max_error_rate) {
av_log(dp, AV_LOG_FATAL, "Decode error rate %g exceeds maximum %g\n",
err_rate, max_error_rate);
ret = FFMPEG_ERROR_RATE_EXCEEDED;
} else if (err_rate)
av_log(dp, AV_LOG_VERBOSE, "Decode error rate %g\n", err_rate);
}
finish:
dec_thread_uninit(&dt);
return (void*)(intptr_t)ret;
}
static enum AVPixelFormat get_format(AVCodecContext *s, const enum AVPixelFormat *pix_fmts)
{
DecoderPriv *dp = s->opaque;
const enum AVPixelFormat *p;
for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(*p);
const AVCodecHWConfig *config = NULL;
int i;
if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
break;
if (dp->hwaccel_id == HWACCEL_GENERIC ||
dp->hwaccel_id == HWACCEL_AUTO) {
for (i = 0;; i++) {
config = avcodec_get_hw_config(s->codec, i);
if (!config)
break;
if (!(config->methods &
AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
continue;
if (config->pix_fmt == *p)
break;
}
}
if (config && config->device_type == dp->hwaccel_device_type) {
dp->hwaccel_pix_fmt = *p;
break;
}
}
return *p;
}
static HWDevice *hw_device_match_by_codec(const AVCodec *codec)
{
const AVCodecHWConfig *config;
HWDevice *dev;
int i;
for (i = 0;; i++) {
config = avcodec_get_hw_config(codec, i);
if (!config)
return NULL;
if (!(config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
continue;
dev = hw_device_get_by_type(config->device_type);
if (dev)
return dev;
}
}
static int hw_device_setup_for_decode(InputStream *ist, DecoderPriv *dp,
const char *hwaccel_device)
{
const AVCodecHWConfig *config;
enum AVHWDeviceType type;
HWDevice *dev = NULL;
int err, auto_device = 0;
if (hwaccel_device) {
dev = hw_device_get_by_name(hwaccel_device);
if (!dev) {
if (dp->hwaccel_id == HWACCEL_AUTO) {
auto_device = 1;
} else if (dp->hwaccel_id == HWACCEL_GENERIC) {
type = dp->hwaccel_device_type;
err = hw_device_init_from_type(type, hwaccel_device,
&dev);
} else {
// This will be dealt with by API-specific initialisation
// (using hwaccel_device), so nothing further needed here.
return 0;
}
} else {
if (dp->hwaccel_id == HWACCEL_AUTO) {
dp->hwaccel_device_type = dev->type;
} else if (dp->hwaccel_device_type != dev->type) {
av_log(dp, AV_LOG_ERROR, "Invalid hwaccel device "
"specified for decoder: device %s of type %s is not "
"usable with hwaccel %s.\n", dev->name,
av_hwdevice_get_type_name(dev->type),
av_hwdevice_get_type_name(dp->hwaccel_device_type));
return AVERROR(EINVAL);
}
}
} else {
if (dp->hwaccel_id == HWACCEL_AUTO) {
auto_device = 1;
} else if (dp->hwaccel_id == HWACCEL_GENERIC) {
type = dp->hwaccel_device_type;
dev = hw_device_get_by_type(type);
// When "-qsv_device device" is used, an internal QSV device named
// as "__qsv_device" is created. Another QSV device is created too
// if "-init_hw_device qsv=name:device" is used. There are 2 QSV devices
// if both "-qsv_device device" and "-init_hw_device qsv=name:device"
// are used, hw_device_get_by_type(AV_HWDEVICE_TYPE_QSV) returns NULL.
// To keep back-compatibility with the removed ad-hoc libmfx setup code,
// call hw_device_get_by_name("__qsv_device") to select the internal QSV
// device.
if (!dev && type == AV_HWDEVICE_TYPE_QSV)
dev = hw_device_get_by_name("__qsv_device");
if (!dev)
err = hw_device_init_from_type(type, NULL, &dev);
} else {
dev = hw_device_match_by_codec(ist->dec);
if (!dev) {
// No device for this codec, but not using generic hwaccel
// and therefore may well not need one - ignore.
return 0;
}
}
}
if (auto_device) {
int i;
if (!avcodec_get_hw_config(ist->dec, 0)) {
// Decoder does not support any hardware devices.
return 0;
}
for (i = 0; !dev; i++) {
config = avcodec_get_hw_config(ist->dec, i);
if (!config)
break;
type = config->device_type;
dev = hw_device_get_by_type(type);
if (dev) {
av_log(dp, AV_LOG_INFO, "Using auto "
"hwaccel type %s with existing device %s.\n",
av_hwdevice_get_type_name(type), dev->name);
}
}
for (i = 0; !dev; i++) {
config = avcodec_get_hw_config(ist->dec, i);
if (!config)
break;
type = config->device_type;
// Try to make a new device of this type.
err = hw_device_init_from_type(type, hwaccel_device,
&dev);
if (err < 0) {
// Can't make a device of this type.
continue;
}
if (hwaccel_device) {
av_log(dp, AV_LOG_INFO, "Using auto "
"hwaccel type %s with new device created "
"from %s.\n", av_hwdevice_get_type_name(type),
hwaccel_device);
} else {
av_log(dp, AV_LOG_INFO, "Using auto "
"hwaccel type %s with new default device.\n",
av_hwdevice_get_type_name(type));
}
}
if (dev) {
dp->hwaccel_device_type = type;
} else {
av_log(dp, AV_LOG_INFO, "Auto hwaccel "
"disabled: no device found.\n");
dp->hwaccel_id = HWACCEL_NONE;
return 0;
}
}
if (!dev) {
av_log(dp, AV_LOG_ERROR, "No device available "
"for decoder: device type %s needed for codec %s.\n",
av_hwdevice_get_type_name(type), ist->dec->name);
return err;
}
dp->dec_ctx->hw_device_ctx = av_buffer_ref(dev->device_ref);
if (!dp->dec_ctx->hw_device_ctx)
return AVERROR(ENOMEM);
return 0;
}
static const char *dec_item_name(void *obj)
{
const DecoderPriv *dp = obj;
return dp->log_name;
}
static const AVClass dec_class = {
.class_name = "Decoder",
.version = LIBAVUTIL_VERSION_INT,
.parent_log_context_offset = offsetof(DecoderPriv, log_parent),
.item_name = dec_item_name,
};
int dec_open(InputStream *ist, Scheduler *sch, unsigned sch_idx,
AVDictionary **dec_opts, const DecoderOpts *o)
{
DecoderPriv *dp;
const AVCodec *codec = ist->dec;
int ret;
ret = dec_alloc(&ist->decoder);
if (ret < 0)
return ret;
dp = dp_from_dec(ist->decoder);
dp->sch = sch;
dp->sch_idx = sch_idx;
dp->flags = o->flags;
dp->dec.class = &dec_class;
dp->log_parent = ist;
dp->framerate_in = o->framerate;
dp->hwaccel_id = o->hwaccel_id;
dp->hwaccel_device_type = o->hwaccel_device_type;
dp->hwaccel_output_format = o->hwaccel_output_format;
snprintf(dp->log_name, sizeof(dp->log_name), "dec:%s", codec->name);
dp->parent_name = av_strdup(o->name ? o->name : "");
if (!dp->parent_name)
return AVERROR(ENOMEM);
if (codec->type == AVMEDIA_TYPE_SUBTITLE &&
(dp->flags & DECODER_FLAG_FIX_SUB_DURATION)) {
for (int i = 0; i < FF_ARRAY_ELEMS(dp->sub_prev); i++) {
dp->sub_prev[i] = av_frame_alloc();
if (!dp->sub_prev[i])
return AVERROR(ENOMEM);
}
dp->sub_heartbeat = av_frame_alloc();
if (!dp->sub_heartbeat)
return AVERROR(ENOMEM);
}
dp->sar_override = ist->par->sample_aspect_ratio;
dp->dec_ctx = avcodec_alloc_context3(codec);
if (!dp->dec_ctx)
return AVERROR(ENOMEM);
ret = avcodec_parameters_to_context(dp->dec_ctx, ist->par);
if (ret < 0) {
av_log(dp, AV_LOG_ERROR, "Error initializing the decoder context.\n");
return ret;
}
dp->dec_ctx->opaque = dp;
dp->dec_ctx->get_format = get_format;
dp->dec_ctx->pkt_timebase = o->time_base;
if (!av_dict_get(*dec_opts, "threads", NULL, 0))
av_dict_set(dec_opts, "threads", "auto", 0);
av_dict_set(dec_opts, "flags", "+copy_opaque", AV_DICT_MULTIKEY);
ret = hw_device_setup_for_decode(ist, dp, o->hwaccel_device);
if (ret < 0) {
av_log(dp, AV_LOG_ERROR,
"Hardware device setup failed for decoder: %s\n",
av_err2str(ret));
return ret;
}
if ((ret = avcodec_open2(dp->dec_ctx, codec, dec_opts)) < 0) {
av_log(dp, AV_LOG_ERROR, "Error while opening decoder: %s\n",
av_err2str(ret));
return ret;
}
ret = check_avoptions(*dec_opts);
if (ret < 0)
return ret;
dp->dec.subtitle_header = dp->dec_ctx->subtitle_header;
dp->dec.subtitle_header_size = dp->dec_ctx->subtitle_header_size;
return 0;
}
int dec_add_filter(Decoder *dec, InputFilter *ifilter)
{
DecoderPriv *dp = dp_from_dec(dec);
// initialize fallback parameters for filtering
return ifilter_parameters_from_dec(ifilter, dp->dec_ctx);
}
|