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
|
/*
* FFM (ffserver live feed) demuxer
* Copyright (c) 2001 Fabrice Bellard
*
* 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 <stdint.h>
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "libavutil/opt.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/pixdesc.h"
#include "libavcodec/internal.h"
#include "avformat.h"
#include "internal.h"
#include "ffm.h"
#include "avio_internal.h"
static int ffm_is_avail_data(AVFormatContext *s, int size)
{
FFMContext *ffm = s->priv_data;
int64_t pos, avail_size;
ptrdiff_t len;
len = ffm->packet_end - ffm->packet_ptr;
if (size <= len)
return 1;
pos = avio_tell(s->pb);
if (!ffm->write_index) {
if (pos == ffm->file_size)
return AVERROR_EOF;
avail_size = ffm->file_size - pos;
} else {
if (pos == ffm->write_index) {
/* exactly at the end of stream */
if (ffm->server_attached)
return AVERROR(EAGAIN);
else
return AVERROR_INVALIDDATA;
} else if (pos < ffm->write_index) {
avail_size = ffm->write_index - pos;
} else {
avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
}
}
avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
if (size <= avail_size)
return 1;
else if (ffm->server_attached)
return AVERROR(EAGAIN);
else
return AVERROR_INVALIDDATA;
}
static int ffm_resync(AVFormatContext *s, uint32_t state)
{
av_log(s, AV_LOG_ERROR, "resyncing\n");
while (state != PACKET_ID) {
if (avio_feof(s->pb)) {
av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
return -1;
}
state = (state << 8) | avio_r8(s->pb);
}
return 0;
}
/* first is true if we read the frame header */
static int ffm_read_data(AVFormatContext *s,
uint8_t *buf, int size, int header)
{
FFMContext *ffm = s->priv_data;
AVIOContext *pb = s->pb;
int fill_size, size1, frame_offset;
uint32_t id;
ptrdiff_t len;
int64_t last_pos = -1;
size1 = size;
while (size > 0) {
redo:
len = ffm->packet_end - ffm->packet_ptr;
if (len < 0)
return -1;
if (len > size)
len = size;
if (len == 0) {
if (avio_tell(pb) == ffm->file_size) {
if (ffm->server_attached) {
avio_seek(pb, ffm->packet_size, SEEK_SET);
} else
return AVERROR_EOF;
}
retry_read:
if (pb->buffer_size != ffm->packet_size) {
int64_t tell = avio_tell(pb);
int ret = ffio_set_buf_size(pb, ffm->packet_size);
if (ret < 0)
return ret;
avio_seek(pb, tell, SEEK_SET);
}
id = avio_rb16(pb); /* PACKET_ID */
if (id != PACKET_ID) {
if (ffm_resync(s, id) < 0)
return -1;
last_pos = avio_tell(pb);
}
fill_size = avio_rb16(pb);
ffm->dts = avio_rb64(pb);
frame_offset = avio_rb16(pb);
avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
if (ffm->packet_size < FFM_HEADER_SIZE + fill_size || frame_offset < 0) {
return -1;
}
ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
/* if first packet or resynchronization packet, we must
handle it specifically */
if (ffm->first_packet || (frame_offset & 0x8000)) {
if (!frame_offset) {
/* This packet has no frame headers in it */
if (avio_tell(pb) >= ffm->packet_size * 3LL) {
int64_t seekback = FFMIN(ffm->packet_size * 2LL, avio_tell(pb) - last_pos);
seekback = FFMAX(seekback, 0);
avio_seek(pb, -seekback, SEEK_CUR);
goto retry_read;
}
/* This is bad, we cannot find a valid frame header */
return 0;
}
ffm->first_packet = 0;
if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE) {
ffm->packet_end = ffm->packet_ptr;
return -1;
}
ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
if (!header)
break;
} else {
ffm->packet_ptr = ffm->packet;
}
goto redo;
}
memcpy(buf, ffm->packet_ptr, len);
buf += len;
ffm->packet_ptr += len;
size -= len;
header = 0;
}
return size1 - size;
}
/* ensure that actual seeking happens between FFM_PACKET_SIZE
and file_size - FFM_PACKET_SIZE */
static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
{
FFMContext *ffm = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos;
pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
pos = FFMAX(pos, FFM_PACKET_SIZE);
ff_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
return avio_seek(pb, pos, SEEK_SET);
}
static int64_t get_dts(AVFormatContext *s, int64_t pos)
{
AVIOContext *pb = s->pb;
int64_t dts;
ffm_seek1(s, pos);
avio_skip(pb, 4);
dts = avio_rb64(pb);
ff_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
return dts;
}
static void adjust_write_index(AVFormatContext *s)
{
FFMContext *ffm = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pts;
//int64_t orig_write_index = ffm->write_index;
int64_t pos_min, pos_max;
int64_t pts_start;
int64_t ptr = avio_tell(pb);
pos_min = 0;
pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
pts_start = get_dts(s, pos_min);
pts = get_dts(s, pos_max);
if (pts - 100000 > pts_start)
goto end;
ffm->write_index = FFM_PACKET_SIZE;
pts_start = get_dts(s, pos_min);
pts = get_dts(s, pos_max);
if (pts - 100000 <= pts_start) {
while (1) {
int64_t newpos;
int64_t newpts;
newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
if (newpos == pos_min)
break;
newpts = get_dts(s, newpos);
if (newpts - 100000 <= pts) {
pos_max = newpos;
pts = newpts;
} else {
pos_min = newpos;
}
}
ffm->write_index += pos_max;
}
end:
avio_seek(pb, ptr, SEEK_SET);
}
static int ffm_append_recommended_configuration(AVStream *st, char **conf)
{
int ret;
size_t newsize;
av_assert0(conf && st);
if (!*conf)
return 0;
if (!st->recommended_encoder_configuration) {
st->recommended_encoder_configuration = *conf;
*conf = 0;
return 0;
}
newsize = strlen(*conf) + strlen(st->recommended_encoder_configuration) + 2;
if ((ret = av_reallocp(&st->recommended_encoder_configuration, newsize)) < 0)
return ret;
av_strlcat(st->recommended_encoder_configuration, ",", newsize);
av_strlcat(st->recommended_encoder_configuration, *conf, newsize);
av_freep(conf);
return 0;
}
#define VALIDATE_PARAMETER(parameter, name, check) { \
if (check) { \
av_log(codec, AV_LOG_ERROR, "Invalid " name " %d\n", codecpar->parameter); \
ret = AVERROR_INVALIDDATA; \
goto fail; \
} \
}
static int ffm2_read_header(AVFormatContext *s)
{
FFMContext *ffm = s->priv_data;
AVStream *st;
AVIOContext *pb = s->pb;
AVCodecContext *codec, *dummy_codec = NULL;
AVCodecParameters *codecpar;
const AVCodecDescriptor *codec_desc;
int ret;
int f_main = 0, f_cprv = -1, f_stvi = -1, f_stau = -1;
AVCodec *enc;
char *buffer;
ffm->packet_size = avio_rb32(pb);
if (ffm->packet_size != FFM_PACKET_SIZE) {
av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n",
ffm->packet_size, FFM_PACKET_SIZE);
ret = AVERROR_INVALIDDATA;
goto fail;
}
ffm->write_index = avio_rb64(pb);
/* get also filesize */
if (pb->seekable) {
ffm->file_size = avio_size(pb);
if (ffm->write_index && 0)
adjust_write_index(s);
} else {
ffm->file_size = (UINT64_C(1) << 63) - 1;
}
dummy_codec = avcodec_alloc_context3(NULL);
while(!avio_feof(pb)) {
unsigned id = avio_rb32(pb);
unsigned size = avio_rb32(pb);
int64_t next = avio_tell(pb) + size;
char rc_eq_buf[128];
if(!id)
break;
switch(id) {
case MKBETAG('M', 'A', 'I', 'N'):
if (f_main++) {
ret = AVERROR(EINVAL);
goto fail;
}
avio_rb32(pb); /* nb_streams */
avio_rb32(pb); /* total bitrate */
break;
case MKBETAG('C', 'O', 'M', 'M'):
f_cprv = f_stvi = f_stau = 0;
st = avformat_new_stream(s, NULL);
if (!st) {
ret = AVERROR(ENOMEM);
goto fail;
}
avpriv_set_pts_info(st, 64, 1, 1000000);
codec = st->codec;
codecpar = st->codecpar;
/* generic info */
codecpar->codec_id = avio_rb32(pb);
codec_desc = avcodec_descriptor_get(codecpar->codec_id);
if (!codec_desc) {
av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codecpar->codec_id);
codecpar->codec_id = AV_CODEC_ID_NONE;
ret = AVERROR_INVALIDDATA;
goto fail;
}
codecpar->codec_type = avio_r8(pb);
if (codecpar->codec_type != codec_desc->type) {
av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n",
codec_desc->type, codecpar->codec_type);
codecpar->codec_id = AV_CODEC_ID_NONE;
codecpar->codec_type = AVMEDIA_TYPE_UNKNOWN;
ret = AVERROR_INVALIDDATA;
goto fail;
}
codecpar->bit_rate = avio_rb32(pb);
if (codecpar->bit_rate < 0) {
av_log(codec, AV_LOG_ERROR, "Invalid bit rate %"PRId64"\n", codecpar->bit_rate);
ret = AVERROR_INVALIDDATA;
goto fail;
}
codec->flags = avio_rb32(pb);
avio_rb32(pb); // flags2
avio_rb32(pb); // debug
if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
int size = avio_rb32(pb);
if (size < 0 || size >= FF_MAX_EXTRADATA_SIZE) {
av_log(s, AV_LOG_ERROR, "Invalid extradata size %d\n", size);
ret = AVERROR_INVALIDDATA;
goto fail;
}
codecpar->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!codecpar->extradata)
return AVERROR(ENOMEM);
codecpar->extradata_size = size;
avio_read(pb, codecpar->extradata, size);
}
break;
case MKBETAG('S', 'T', 'V', 'I'):
if (f_stvi++ || codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
ret = AVERROR(EINVAL);
goto fail;
}
avio_rb32(pb); // time_base.num
avio_rb32(pb); // time_base.den
codecpar->width = avio_rb16(pb);
codecpar->height = avio_rb16(pb);
ret = av_image_check_size(codecpar->width, codecpar->height, 0, s);
if (ret < 0)
goto fail;
avio_rb16(pb); // gop_size
codecpar->format = avio_rb32(pb);
if (!av_pix_fmt_desc_get(codecpar->format)) {
av_log(s, AV_LOG_ERROR, "Invalid pix fmt id: %d\n", codecpar->format);
codecpar->format = AV_PIX_FMT_NONE;
goto fail;
}
avio_r8(pb); // qmin
avio_r8(pb); // qmax
avio_r8(pb); // max_qdiff
avio_rb16(pb); // qcompress / 10000.0
avio_rb16(pb); // qblur / 10000.0
avio_rb32(pb); // bit_rate_tolerance
avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
avio_rb32(pb); // rc_max_rate
avio_rb32(pb); // rc_min_rate
avio_rb32(pb); // rc_buffer_size
avio_rb64(pb); // i_quant_factor
avio_rb64(pb); // b_quant_factor
avio_rb64(pb); // i_quant_offset
avio_rb64(pb); // b_quant_offset
avio_rb32(pb); // dct_algo
avio_rb32(pb); // strict_std_compliance
avio_rb32(pb); // max_b_frames
avio_rb32(pb); // mpeg_quant
avio_rb32(pb); // intra_dc_precision
avio_rb32(pb); // me_method
avio_rb32(pb); // mb_decision
avio_rb32(pb); // nsse_weight
avio_rb32(pb); // frame_skip_cmp
avio_rb64(pb); // rc_buffer_aggressivity
codecpar->codec_tag = avio_rb32(pb);
avio_r8(pb); // thread_count
avio_rb32(pb); // coder_type
avio_rb32(pb); // me_cmp
avio_rb32(pb); // me_subpel_quality
avio_rb32(pb); // me_range
avio_rb32(pb); // keyint_min
avio_rb32(pb); // scenechange_threshold
avio_rb32(pb); // b_frame_strategy
avio_rb64(pb); // qcompress
avio_rb64(pb); // qblur
avio_rb32(pb); // max_qdiff
avio_rb32(pb); // refs
break;
case MKBETAG('S', 'T', 'A', 'U'):
if (f_stau++ || codecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
ret = AVERROR(EINVAL);
goto fail;
}
codecpar->sample_rate = avio_rb32(pb);
VALIDATE_PARAMETER(sample_rate, "sample rate", codecpar->sample_rate < 0)
codecpar->channels = avio_rl16(pb);
VALIDATE_PARAMETER(channels, "number of channels", codecpar->channels < 0)
codecpar->frame_size = avio_rl16(pb);
VALIDATE_PARAMETER(frame_size, "frame size", codecpar->frame_size < 0)
break;
case MKBETAG('C', 'P', 'R', 'V'):
if (f_cprv++) {
ret = AVERROR(EINVAL);
goto fail;
}
enc = avcodec_find_encoder(codecpar->codec_id);
if (enc && enc->priv_data_size && enc->priv_class) {
buffer = av_malloc(size + 1);
if (!buffer) {
ret = AVERROR(ENOMEM);
goto fail;
}
avio_get_str(pb, size, buffer, size + 1);
if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
goto fail;
}
break;
case MKBETAG('S', '2', 'V', 'I'):
if (f_stvi++ || !size || codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
ret = AVERROR(EINVAL);
goto fail;
}
buffer = av_malloc(size);
if (!buffer) {
ret = AVERROR(ENOMEM);
goto fail;
}
avio_get_str(pb, INT_MAX, buffer, size);
// The lack of AVOptions support in AVCodecParameters makes this back and forth copying needed
avcodec_parameters_to_context(dummy_codec, codecpar);
av_set_options_string(dummy_codec, buffer, "=", ",");
avcodec_parameters_from_context(codecpar, dummy_codec);
if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
goto fail;
break;
case MKBETAG('S', '2', 'A', 'U'):
if (f_stau++ || !size || codecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
ret = AVERROR(EINVAL);
goto fail;
}
buffer = av_malloc(size);
if (!buffer) {
ret = AVERROR(ENOMEM);
goto fail;
}
avio_get_str(pb, INT_MAX, buffer, size);
// The lack of AVOptions support in AVCodecParameters makes this back and forth copying needed
avcodec_parameters_to_context(dummy_codec, codecpar);
av_set_options_string(dummy_codec, buffer, "=", ",");
avcodec_parameters_from_context(codecpar, dummy_codec);
if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
goto fail;
break;
}
avio_seek(pb, next, SEEK_SET);
}
/* get until end of block reached */
while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)
avio_r8(pb);
/* init packet demux */
ffm->packet_ptr = ffm->packet;
ffm->packet_end = ffm->packet;
ffm->frame_offset = 0;
ffm->dts = 0;
ffm->read_state = READ_HEADER;
ffm->first_packet = 1;
avcodec_free_context(&dummy_codec);
return 0;
fail:
avcodec_free_context(&dummy_codec);
return ret;
}
static int ffm_read_header(AVFormatContext *s)
{
FFMContext *ffm = s->priv_data;
AVStream *st;
AVIOContext *pb = s->pb;
AVCodecContext *codec, *dummy_codec = NULL;
AVCodecParameters *codecpar;
const AVCodecDescriptor *codec_desc;
int i, nb_streams, ret;
uint32_t tag;
/* header */
tag = avio_rl32(pb);
if (tag == MKTAG('F', 'F', 'M', '2'))
return ffm2_read_header(s);
if (tag != MKTAG('F', 'F', 'M', '1'))
goto fail;
ffm->packet_size = avio_rb32(pb);
if (ffm->packet_size != FFM_PACKET_SIZE)
goto fail;
ffm->write_index = avio_rb64(pb);
/* get also filesize */
if (pb->seekable) {
ffm->file_size = avio_size(pb);
if (ffm->write_index && 0)
adjust_write_index(s);
} else {
ffm->file_size = (UINT64_C(1) << 63) - 1;
}
dummy_codec = avcodec_alloc_context3(NULL);
nb_streams = avio_rb32(pb);
avio_rb32(pb); /* total bitrate */
/* read each stream */
for(i=0;i<nb_streams;i++) {
char rc_eq_buf[128];
st = avformat_new_stream(s, NULL);
if (!st)
goto fail;
avpriv_set_pts_info(st, 64, 1, 1000000);
codec = st->codec;
codecpar = st->codecpar;
/* generic info */
codecpar->codec_id = avio_rb32(pb);
codec_desc = avcodec_descriptor_get(codecpar->codec_id);
if (!codec_desc) {
av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codecpar->codec_id);
codecpar->codec_id = AV_CODEC_ID_NONE;
goto fail;
}
codecpar->codec_type = avio_r8(pb); /* codec_type */
if (codecpar->codec_type != codec_desc->type) {
av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n",
codec_desc->type, codecpar->codec_type);
codecpar->codec_id = AV_CODEC_ID_NONE;
codecpar->codec_type = AVMEDIA_TYPE_UNKNOWN;
goto fail;
}
codecpar->bit_rate = avio_rb32(pb);
if (codecpar->bit_rate < 0) {
av_log(codec, AV_LOG_WARNING, "Invalid bit rate %"PRId64"\n", codecpar->bit_rate);
goto fail;
}
codec->flags = avio_rb32(pb);
avio_rb32(pb); // flags2
avio_rb32(pb); // debug
/* specific info */
switch(codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
avio_rb32(pb); // time_base.num
avio_rb32(pb); // time_base.den
codecpar->width = avio_rb16(pb);
codecpar->height = avio_rb16(pb);
if (av_image_check_size(codecpar->width, codecpar->height, 0, s) < 0)
goto fail;
avio_rb16(pb); // gop_size
codecpar->format = avio_rb32(pb);
if (!av_pix_fmt_desc_get(codecpar->format)) {
av_log(s, AV_LOG_ERROR, "Invalid pix fmt id: %d\n", codecpar->format);
codecpar->format = AV_PIX_FMT_NONE;
goto fail;
}
avio_r8(pb); // qmin
avio_r8(pb); // qmax
avio_r8(pb); // max_qdiff
avio_rb16(pb); // qcompress / 10000.0
avio_rb16(pb); // qblur / 10000.0
avio_rb32(pb); // bit_rate_tolerance
avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
avio_rb32(pb); // rc_max_rate
avio_rb32(pb); // rc_min_rate
avio_rb32(pb); // rc_buffer_size
avio_rb64(pb); // i_quant_factor
avio_rb64(pb); // b_quant_factor
avio_rb64(pb); // i_quant_offset
avio_rb64(pb); // b_quant_offset
avio_rb32(pb); // dct_algo
avio_rb32(pb); // strict_std_compliance
avio_rb32(pb); // max_b_frames
avio_rb32(pb); // mpeg_quant
avio_rb32(pb); // intra_dc_precision
avio_rb32(pb); // me_method
avio_rb32(pb); // mb_decision
avio_rb32(pb); // nsse_weight
avio_rb32(pb); // frame_skip_cmp
avio_rb64(pb); // rc_buffer_aggressivity
codecpar->codec_tag = avio_rb32(pb);
avio_r8(pb); // thread_count
avio_rb32(pb); // coder_type
avio_rb32(pb); // me_cmp
avio_rb32(pb); // me_subpel_quality
avio_rb32(pb); // me_range
avio_rb32(pb); // keyint_min
avio_rb32(pb); // scenechange_threshold
avio_rb32(pb); // b_frame_strategy
avio_rb64(pb); // qcompress
avio_rb64(pb); // qblur
avio_rb32(pb); // max_qdiff
avio_rb32(pb); // refs
break;
case AVMEDIA_TYPE_AUDIO:
codecpar->sample_rate = avio_rb32(pb);
VALIDATE_PARAMETER(sample_rate, "sample rate", codecpar->sample_rate < 0)
codecpar->channels = avio_rl16(pb);
VALIDATE_PARAMETER(channels, "number of channels", codecpar->channels < 0)
codecpar->frame_size = avio_rl16(pb);
VALIDATE_PARAMETER(frame_size, "frame size", codecpar->frame_size < 0)
break;
default:
goto fail;
}
if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
int size = avio_rb32(pb);
if (size < 0 || size >= FF_MAX_EXTRADATA_SIZE) {
av_log(s, AV_LOG_ERROR, "Invalid extradata size %d\n", size);
goto fail;
}
codecpar->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!codecpar->extradata)
return AVERROR(ENOMEM);
codecpar->extradata_size = size;
avio_read(pb, codecpar->extradata, size);
}
}
/* get until end of block reached */
while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)
avio_r8(pb);
/* init packet demux */
ffm->packet_ptr = ffm->packet;
ffm->packet_end = ffm->packet;
ffm->frame_offset = 0;
ffm->dts = 0;
ffm->read_state = READ_HEADER;
ffm->first_packet = 1;
avcodec_free_context(&dummy_codec);
return 0;
fail:
avcodec_free_context(&dummy_codec);
return -1;
}
/* return < 0 if eof */
static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int size;
FFMContext *ffm = s->priv_data;
int duration, ret;
switch(ffm->read_state) {
case READ_HEADER:
if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
return ret;
ff_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
FRAME_HEADER_SIZE)
return -1;
if (ffm->header[1] & FLAG_DTS)
if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
return -1;
ffm->read_state = READ_DATA;
/* fall through */
case READ_DATA:
size = AV_RB24(ffm->header + 2);
if ((ret = ffm_is_avail_data(s, size)) < 0)
return ret;
duration = AV_RB24(ffm->header + 5);
if (av_new_packet(pkt, size) < 0) {
return AVERROR(ENOMEM);
}
pkt->stream_index = ffm->header[0];
if ((unsigned)pkt->stream_index >= s->nb_streams) {
av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
av_packet_unref(pkt);
ffm->read_state = READ_HEADER;
return -1;
}
pkt->pos = avio_tell(s->pb);
if (ffm->header[1] & FLAG_KEY_FRAME)
pkt->flags |= AV_PKT_FLAG_KEY;
ffm->read_state = READ_HEADER;
if (ffm_read_data(s, pkt->data, size, 0) != size) {
/* bad case: desynchronized packet. we cancel all the packet loading */
av_packet_unref(pkt);
return -1;
}
pkt->pts = AV_RB64(ffm->header+8);
if (ffm->header[1] & FLAG_DTS)
pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
else
pkt->dts = pkt->pts;
pkt->duration = duration;
break;
}
return 0;
}
/* seek to a given time in the file. The file read pointer is
positioned at or before pts. XXX: the following code is quite
approximative */
static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
{
FFMContext *ffm = s->priv_data;
int64_t pos_min, pos_max, pos;
int64_t pts_min, pts_max, pts;
double pos1;
ff_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
/* find the position using linear interpolation (better than
dichotomy in typical cases) */
if (ffm->write_index && ffm->write_index < ffm->file_size) {
if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) {
pos_min = FFM_PACKET_SIZE;
pos_max = ffm->write_index - FFM_PACKET_SIZE;
} else {
pos_min = ffm->write_index;
pos_max = ffm->file_size - FFM_PACKET_SIZE;
}
} else {
pos_min = FFM_PACKET_SIZE;
pos_max = ffm->file_size - FFM_PACKET_SIZE;
}
while (pos_min <= pos_max) {
pts_min = get_dts(s, pos_min);
pts_max = get_dts(s, pos_max);
if (pts_min > wanted_pts || pts_max <= wanted_pts) {
pos = pts_min > wanted_pts ? pos_min : pos_max;
goto found;
}
/* linear interpolation */
pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
(double)(pts_max - pts_min);
pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
if (pos <= pos_min)
pos = pos_min;
else if (pos >= pos_max)
pos = pos_max;
pts = get_dts(s, pos);
/* check if we are lucky */
if (pts == wanted_pts) {
goto found;
} else if (pts > wanted_pts) {
pos_max = pos - FFM_PACKET_SIZE;
} else {
pos_min = pos + FFM_PACKET_SIZE;
}
}
pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
found:
if (ffm_seek1(s, pos) < 0)
return -1;
/* reset read state */
ffm->read_state = READ_HEADER;
ffm->packet_ptr = ffm->packet;
ffm->packet_end = ffm->packet;
ffm->first_packet = 1;
return 0;
}
static int ffm_probe(AVProbeData *p)
{
if (
p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
(p->buf[3] == '1' || p->buf[3] == '2'))
return AVPROBE_SCORE_MAX + 1;
return 0;
}
static const AVOption options[] = {
{"server_attached", NULL, offsetof(FFMContext, server_attached), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_EXPORT },
{"ffm_write_index", NULL, offsetof(FFMContext, write_index), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, AV_OPT_FLAG_EXPORT },
{"ffm_file_size", NULL, offsetof(FFMContext, file_size), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, AV_OPT_FLAG_EXPORT },
{ NULL },
};
static const AVClass ffm_class = {
.class_name = "ffm demuxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVInputFormat ff_ffm_demuxer = {
.name = "ffm",
.long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
.priv_data_size = sizeof(FFMContext),
.read_probe = ffm_probe,
.read_header = ffm_read_header,
.read_packet = ffm_read_packet,
.read_seek = ffm_seek,
.priv_class = &ffm_class,
};
|