aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/flvdec.c
blob: 22a9b9e4a7ce498f47d0d72bd0fd4f2c6e97d0b8 (plain) (blame)
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
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
/*
 * FLV demuxer
 * Copyright (c) 2003 The FFmpeg Project
 *
 * This demuxer will generate a 1 byte extradata for VP6F content.
 * It is composed of:
 *  - upper 4 bits: difference between encoded width and visible width
 *  - lower 4 bits: difference between encoded height and visible height
 *
 * 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/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/dict.h"
#include "libavutil/dict_internal.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/internal.h"
#include "libavutil/intfloat.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mastering_display_metadata.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "flv.h"

#define VALIDATE_INDEX_TS_THRESH 2500

#define RESYNC_BUFFER_SIZE (1<<20)

#define MAX_DEPTH 16      ///< arbitrary limit to prevent unbounded recursion

typedef struct FLVMasteringMeta {
    double r_x;
    double r_y;
    double g_x;
    double g_y;
    double b_x;
    double b_y;
    double white_x;
    double white_y;
    double max_luminance;
    double min_luminance;
} FLVMasteringMeta;

typedef struct FLVMetaVideoColor {
    uint64_t matrix_coefficients;
    uint64_t transfer_characteristics;
    uint64_t primaries;
    uint64_t max_cll;
    uint64_t max_fall;
    FLVMasteringMeta mastering_meta;
} FLVMetaVideoColor;

typedef struct FLVContext {
    const AVClass *class; ///< Class for private options.
    int trust_metadata;   ///< configure streams according onMetaData
    int trust_datasize;   ///< trust data size of FLVTag
    int dump_full_metadata;   ///< Dump full metadata of the onMetadata
    int wrong_dts;        ///< wrong dts due to negative cts
    uint8_t *new_extradata[FLV_STREAM_TYPE_NB];
    int new_extradata_size[FLV_STREAM_TYPE_NB];
    int last_sample_rate;
    int last_channels;
    struct {
        int64_t dts;
        int64_t pos;
    } validate_index[2];
    int validate_next;
    int validate_count;
    int searched_for_end;

    uint8_t resync_buffer[2*RESYNC_BUFFER_SIZE];

    int broken_sizes;
    int64_t sum_flv_tag_size;

    int last_keyframe_stream_index;
    int keyframe_count;
    int64_t video_bit_rate;
    int64_t audio_bit_rate;
    int64_t *keyframe_times;
    int64_t *keyframe_filepositions;
    int missing_streams;
    AVRational framerate;
    int64_t last_ts;
    int64_t time_offset;
    int64_t time_pos;

    FLVMetaVideoColor *metaVideoColor;
    int meta_color_info_flag;
} FLVContext;

/* AMF date type */
typedef struct amf_date {
    double   milliseconds;
    int16_t  timezone;
} amf_date;

static int probe(const AVProbeData *p, int live)
{
    const uint8_t *d = p->buf;
    unsigned offset = AV_RB32(d + 5);

    if (d[0] == 'F' &&
        d[1] == 'L' &&
        d[2] == 'V' &&
        d[3] < 5 && d[5] == 0 &&
        offset + 100 < p->buf_size &&
        offset > 8) {
        int is_live = !memcmp(d + offset + 40, "NGINX RTMP", 10);

        if (live == is_live)
            return AVPROBE_SCORE_MAX;
    }
    return 0;
}

static int flv_probe(const AVProbeData *p)
{
    return probe(p, 0);
}

static int live_flv_probe(const AVProbeData *p)
{
    return probe(p, 1);
}

static int kux_probe(const AVProbeData *p)
{
    const uint8_t *d = p->buf;

    if (d[0] == 'K' &&
        d[1] == 'D' &&
        d[2] == 'K' &&
        d[3] == 0 &&
        d[4] == 0) {
        return AVPROBE_SCORE_EXTENSION + 1;
    }
    return 0;
}

static void add_keyframes_index(AVFormatContext *s)
{
    FLVContext *flv   = s->priv_data;
    AVStream *stream  = NULL;
    unsigned int i    = 0;

    if (flv->last_keyframe_stream_index < 0) {
        av_log(s, AV_LOG_DEBUG, "keyframe stream hasn't been created\n");
        return;
    }

    av_assert0(flv->last_keyframe_stream_index <= s->nb_streams);
    stream = s->streams[flv->last_keyframe_stream_index];

    if (ffstream(stream)->nb_index_entries == 0) {
        for (i = 0; i < flv->keyframe_count; i++) {
            av_log(s, AV_LOG_TRACE, "keyframe filepositions = %"PRId64" times = %"PRId64"\n",
                   flv->keyframe_filepositions[i], flv->keyframe_times[i]);
            av_add_index_entry(stream, flv->keyframe_filepositions[i],
                flv->keyframe_times[i], 0, 0, AVINDEX_KEYFRAME);
        }
    } else
        av_log(s, AV_LOG_WARNING, "Skipping duplicate index\n");

    if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
        av_freep(&flv->keyframe_times);
        av_freep(&flv->keyframe_filepositions);
        flv->keyframe_count = 0;
    }
}

static AVStream *create_stream(AVFormatContext *s, int codec_type)
{
    FLVContext *flv   = s->priv_data;
    AVStream *st = avformat_new_stream(s, NULL);
    if (!st)
        return NULL;
    st->codecpar->codec_type = codec_type;
    if (s->nb_streams>=3 ||(   s->nb_streams==2
                           && s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE
                           && s->streams[1]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE
                           && s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_DATA
                           && s->streams[1]->codecpar->codec_type != AVMEDIA_TYPE_DATA))
        s->ctx_flags &= ~AVFMTCTX_NOHEADER;
    if (codec_type == AVMEDIA_TYPE_AUDIO) {
        st->codecpar->bit_rate = flv->audio_bit_rate;
        flv->missing_streams &= ~FLV_HEADER_FLAG_HASAUDIO;
    }
    if (codec_type == AVMEDIA_TYPE_VIDEO) {
        st->codecpar->bit_rate = flv->video_bit_rate;
        flv->missing_streams &= ~FLV_HEADER_FLAG_HASVIDEO;
        st->avg_frame_rate = flv->framerate;
    }


    avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
    flv->last_keyframe_stream_index = s->nb_streams - 1;
    add_keyframes_index(s);
    return st;
}

static int flv_same_audio_codec(AVCodecParameters *apar, int flags)
{
    int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
    int flv_codecid           = flags & FLV_AUDIO_CODECID_MASK;
    int codec_id;

    if (!apar->codec_id && !apar->codec_tag)
        return 1;

    if (apar->bits_per_coded_sample != bits_per_coded_sample)
        return 0;

    switch (flv_codecid) {
    // no distinction between S16 and S8 PCM codec flags
    case FLV_CODECID_PCM:
        codec_id = bits_per_coded_sample == 8
                   ? AV_CODEC_ID_PCM_U8
#if HAVE_BIGENDIAN
                   : AV_CODEC_ID_PCM_S16BE;
#else
                   : AV_CODEC_ID_PCM_S16LE;
#endif
        return codec_id == apar->codec_id;
    case FLV_CODECID_PCM_LE:
        codec_id = bits_per_coded_sample == 8
                   ? AV_CODEC_ID_PCM_U8
                   : AV_CODEC_ID_PCM_S16LE;
        return codec_id == apar->codec_id;
    case FLV_CODECID_AAC:
        return apar->codec_id == AV_CODEC_ID_AAC;
    case FLV_CODECID_ADPCM:
        return apar->codec_id == AV_CODEC_ID_ADPCM_SWF;
    case FLV_CODECID_SPEEX:
        return apar->codec_id == AV_CODEC_ID_SPEEX;
    case FLV_CODECID_MP3:
        return apar->codec_id == AV_CODEC_ID_MP3;
    case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
    case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
    case FLV_CODECID_NELLYMOSER:
        return apar->codec_id == AV_CODEC_ID_NELLYMOSER;
    case FLV_CODECID_PCM_MULAW:
        return apar->sample_rate == 8000 &&
               apar->codec_id    == AV_CODEC_ID_PCM_MULAW;
    case FLV_CODECID_PCM_ALAW:
        return apar->sample_rate == 8000 &&
               apar->codec_id    == AV_CODEC_ID_PCM_ALAW;
    default:
        return apar->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
    }
}

static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream,
                                AVCodecParameters *apar, int flv_codecid)
{
    switch (flv_codecid) {
    // no distinction between S16 and S8 PCM codec flags
    case FLV_CODECID_PCM:
        apar->codec_id = apar->bits_per_coded_sample == 8
                           ? AV_CODEC_ID_PCM_U8
#if HAVE_BIGENDIAN
                           : AV_CODEC_ID_PCM_S16BE;
#else
                           : AV_CODEC_ID_PCM_S16LE;
#endif
        break;
    case FLV_CODECID_PCM_LE:
        apar->codec_id = apar->bits_per_coded_sample == 8
                           ? AV_CODEC_ID_PCM_U8
                           : AV_CODEC_ID_PCM_S16LE;
        break;
    case FLV_CODECID_AAC:
        apar->codec_id = AV_CODEC_ID_AAC;
        break;
    case FLV_CODECID_ADPCM:
        apar->codec_id = AV_CODEC_ID_ADPCM_SWF;
        break;
    case FLV_CODECID_SPEEX:
        apar->codec_id    = AV_CODEC_ID_SPEEX;
        apar->sample_rate = 16000;
        break;
    case FLV_CODECID_MP3:
        apar->codec_id      = AV_CODEC_ID_MP3;
        ffstream(astream)->need_parsing = AVSTREAM_PARSE_FULL;
        break;
    case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
        // in case metadata does not otherwise declare samplerate
        apar->sample_rate = 8000;
        apar->codec_id    = AV_CODEC_ID_NELLYMOSER;
        break;
    case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
        apar->sample_rate = 16000;
        apar->codec_id    = AV_CODEC_ID_NELLYMOSER;
        break;
    case FLV_CODECID_NELLYMOSER:
        apar->codec_id = AV_CODEC_ID_NELLYMOSER;
        break;
    case FLV_CODECID_PCM_MULAW:
        apar->sample_rate = 8000;
        apar->codec_id    = AV_CODEC_ID_PCM_MULAW;
        break;
    case FLV_CODECID_PCM_ALAW:
        apar->sample_rate = 8000;
        apar->codec_id    = AV_CODEC_ID_PCM_ALAW;
        break;
    default:
        avpriv_request_sample(s, "Audio codec (%x)",
               flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
        apar->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
    }
}

static int flv_same_video_codec(AVCodecParameters *vpar, uint32_t flv_codecid)
{
    if (!vpar->codec_id && !vpar->codec_tag)
        return 1;

    switch (flv_codecid) {
    case MKBETAG('h', 'v', 'c', '1'):
        return vpar->codec_id == AV_CODEC_ID_HEVC;
    case MKBETAG('a', 'v', '0', '1'):
        return vpar->codec_id == AV_CODEC_ID_AV1;
    case MKBETAG('v', 'p', '0', '9'):
        return vpar->codec_id == AV_CODEC_ID_VP9;
    case FLV_CODECID_H263:
        return vpar->codec_id == AV_CODEC_ID_FLV1;
    case FLV_CODECID_SCREEN:
        return vpar->codec_id == AV_CODEC_ID_FLASHSV;
    case FLV_CODECID_SCREEN2:
        return vpar->codec_id == AV_CODEC_ID_FLASHSV2;
    case FLV_CODECID_VP6:
        return vpar->codec_id == AV_CODEC_ID_VP6F;
    case FLV_CODECID_VP6A:
        return vpar->codec_id == AV_CODEC_ID_VP6A;
    case FLV_CODECID_H264:
        return vpar->codec_id == AV_CODEC_ID_H264;
    default:
        return vpar->codec_tag == flv_codecid;
    }
}

static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream,
                               uint32_t flv_codecid, int read)
{
    FFStream *const vstreami = ffstream(vstream);
    int ret = 0;
    AVCodecParameters *par = vstream->codecpar;
    enum AVCodecID old_codec_id = vstream->codecpar->codec_id;

    switch (flv_codecid) {
    case MKBETAG('h', 'v', 'c', '1'):
        par->codec_id = AV_CODEC_ID_HEVC;
        vstreami->need_parsing = AVSTREAM_PARSE_HEADERS;
        break;
    case MKBETAG('a', 'v', '0', '1'):
        par->codec_id = AV_CODEC_ID_AV1;
        vstreami->need_parsing = AVSTREAM_PARSE_HEADERS;
        break;
    case MKBETAG('v', 'p', '0', '9'):
        par->codec_id = AV_CODEC_ID_VP9;
        vstreami->need_parsing = AVSTREAM_PARSE_HEADERS;
        break;
    case FLV_CODECID_H263:
        par->codec_id = AV_CODEC_ID_FLV1;
        break;
    case FLV_CODECID_REALH263:
        par->codec_id = AV_CODEC_ID_H263;
        break; // Really mean it this time
    case FLV_CODECID_SCREEN:
        par->codec_id = AV_CODEC_ID_FLASHSV;
        break;
    case FLV_CODECID_SCREEN2:
        par->codec_id = AV_CODEC_ID_FLASHSV2;
        break;
    case FLV_CODECID_VP6:
        par->codec_id = AV_CODEC_ID_VP6F;
    case FLV_CODECID_VP6A:
        if (flv_codecid == FLV_CODECID_VP6A)
            par->codec_id = AV_CODEC_ID_VP6A;
        if (read) {
            if (par->extradata_size != 1) {
                ff_alloc_extradata(par, 1);
            }
            if (par->extradata)
                par->extradata[0] = avio_r8(s->pb);
            else
                avio_skip(s->pb, 1);
        }
        ret = 1;     // 1 byte body size adjustment for flv_read_packet()
        break;
    case FLV_CODECID_H264:
        par->codec_id = AV_CODEC_ID_H264;
        vstreami->need_parsing = AVSTREAM_PARSE_HEADERS;
        break;
    case FLV_CODECID_MPEG4:
        par->codec_id = AV_CODEC_ID_MPEG4;
        break;
    default:
        avpriv_request_sample(s, "Video codec (%x)", flv_codecid);
        par->codec_tag = flv_codecid;
    }

    if (!vstreami->need_context_update && par->codec_id != old_codec_id) {
        avpriv_request_sample(s, "Changing the codec id midstream");
        return AVERROR_PATCHWELCOME;
    }

    return ret;
}

static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize)
{
    int ret;
    int length = avio_rb16(ioc);
    if (length >= buffsize) {
        avio_skip(ioc, length);
        return -1;
    }

    ret = avio_read(ioc, buffer, length);
    if (ret < 0)
        return ret;
    if (ret < length)
        return AVERROR_INVALIDDATA;

    buffer[length] = '\0';

    return length;
}

static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t max_pos)
{
    FLVContext *flv       = s->priv_data;
    unsigned int timeslen = 0, fileposlen = 0, i;
    char str_val[256];
    int64_t *times         = NULL;
    int64_t *filepositions = NULL;
    int ret                = AVERROR(ENOSYS);
    int64_t initial_pos    = avio_tell(ioc);

    if (flv->keyframe_count > 0) {
        av_log(s, AV_LOG_DEBUG, "keyframes have been parsed\n");
        return 0;
    }
    av_assert0(!flv->keyframe_times);
    av_assert0(!flv->keyframe_filepositions);

    if (s->flags & AVFMT_FLAG_IGNIDX)
        return 0;

    while (avio_tell(ioc) < max_pos - 2 &&
           amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
        int64_t **current_array;
        unsigned int arraylen;
        int factor;

        // Expect array object in context
        if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
            break;

        arraylen = avio_rb32(ioc);
        if (arraylen>>28)
            break;

        if       (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times) {
            current_array = &times;
            timeslen      = arraylen;
            factor = 1000;
        } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) &&
                   !filepositions) {
            current_array = &filepositions;
            fileposlen    = arraylen;
            factor = 1;
        } else
            // unexpected metatag inside keyframes, will not use such
            // metadata for indexing
            break;

        if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
            ret = AVERROR(ENOMEM);
            goto finish;
        }

        for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
            double d;
            if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
                goto invalid;
            d = av_int2double(avio_rb64(ioc)) * factor;
            if (isnan(d) || d < INT64_MIN || d > INT64_MAX)
                goto invalid;
            if (avio_feof(ioc))
                goto invalid;
            current_array[0][i] = d;
        }
        if (times && filepositions) {
            // All done, exiting at a position allowing amf_parse_object
            // to finish parsing the object
            ret = 0;
            break;
        }
    }

    if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
        for (i = 0; i < FFMIN(2,fileposlen); i++) {
            flv->validate_index[i].pos = filepositions[i];
            flv->validate_index[i].dts = times[i];
            flv->validate_count        = i + 1;
        }
        flv->keyframe_times = times;
        flv->keyframe_filepositions = filepositions;
        flv->keyframe_count = timeslen;
        times = NULL;
        filepositions = NULL;
    } else {
invalid:
        av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
    }

finish:
    av_freep(&times);
    av_freep(&filepositions);
    avio_seek(ioc, initial_pos, SEEK_SET);
    return ret;
}

static int amf_parse_object(AVFormatContext *s, AVStream *astream,
                            AVStream *vstream, const char *key,
                            int64_t max_pos, int depth)
{
    AVCodecParameters *apar, *vpar;
    FLVContext *flv = s->priv_data;
    AVIOContext *ioc;
    AMFDataType amf_type;
    FLVMetaVideoColor *meta_video_color = flv->metaVideoColor;
    char str_val[1024];
    double num_val;
    amf_date date;

    if (depth > MAX_DEPTH)
        return AVERROR_PATCHWELCOME;

    num_val  = 0;
    ioc      = s->pb;
    if (avio_feof(ioc))
        return AVERROR_EOF;
    amf_type = avio_r8(ioc);

    switch (amf_type) {
    case AMF_DATA_TYPE_NUMBER:
        num_val = av_int2double(avio_rb64(ioc));
        break;
    case AMF_DATA_TYPE_BOOL:
        num_val = avio_r8(ioc);
        break;
    case AMF_DATA_TYPE_STRING:
        if (amf_get_string(ioc, str_val, sizeof(str_val)) < 0) {
            av_log(s, AV_LOG_ERROR, "AMF_DATA_TYPE_STRING parsing failed\n");
            return -1;
        }
        break;
    case AMF_DATA_TYPE_OBJECT:
        if (key &&
            (ioc->seekable & AVIO_SEEKABLE_NORMAL) &&
            !strcmp(KEYFRAMES_TAG, key) && depth == 1)
            if (parse_keyframes_index(s, ioc, max_pos) < 0)
                av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
            else
                add_keyframes_index(s);
        while (avio_tell(ioc) < max_pos - 2 &&
               amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
            if (amf_parse_object(s, astream, vstream, str_val, max_pos,
                                 depth + 1) < 0)
                return -1;     // if we couldn't skip, bomb out.
        if (avio_r8(ioc) != AMF_END_OF_OBJECT) {
            av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_OBJECT\n");
            return -1;
        }
        break;
    case AMF_DATA_TYPE_NULL:
    case AMF_DATA_TYPE_UNDEFINED:
    case AMF_DATA_TYPE_UNSUPPORTED:
        break;     // these take up no additional space
    case AMF_DATA_TYPE_MIXEDARRAY:
    {
        unsigned v;
        avio_skip(ioc, 4);     // skip 32-bit max array index
        while (avio_tell(ioc) < max_pos - 2 &&
               amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
            // this is the only case in which we would want a nested
            // parse to not skip over the object
            if (amf_parse_object(s, astream, vstream, str_val, max_pos,
                                 depth + 1) < 0)
                return -1;
        v = avio_r8(ioc);
        if (v != AMF_END_OF_OBJECT) {
            av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_MIXEDARRAY, found %d\n", v);
            return -1;
        }
        break;
    }
    case AMF_DATA_TYPE_ARRAY:
    {
        unsigned int arraylen, i;

        arraylen = avio_rb32(ioc);
        for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++)
            if (amf_parse_object(s, NULL, NULL, NULL, max_pos,
                                 depth + 1) < 0)
                return -1;      // if we couldn't skip, bomb out.
    }
    break;
    case AMF_DATA_TYPE_DATE:
        // timestamp (double) and UTC offset (int16)
        date.milliseconds = av_int2double(avio_rb64(ioc));
        date.timezone = avio_rb16(ioc);
        break;
    default:                    // unsupported type, we couldn't skip
        av_log(s, AV_LOG_ERROR, "unsupported amf type %d\n", amf_type);
        return -1;
    }

    if (key) {
        apar = astream ? astream->codecpar : NULL;
        vpar = vstream ? vstream->codecpar : NULL;

        // stream info doesn't live any deeper than the first object
        if (depth == 1) {
            if (amf_type == AMF_DATA_TYPE_NUMBER ||
                amf_type == AMF_DATA_TYPE_BOOL) {
                if (!strcmp(key, "duration"))
                    s->duration = num_val * AV_TIME_BASE;
                else if (!strcmp(key, "videodatarate") &&
                         0 <= (int)(num_val * 1024.0))
                    flv->video_bit_rate = num_val * 1024.0;
                else if (!strcmp(key, "audiodatarate") &&
                         0 <= (int)(num_val * 1024.0))
                    flv->audio_bit_rate = num_val * 1024.0;
                else if (!strcmp(key, "framerate")) {
                    flv->framerate = av_d2q(num_val, 1000);
                    if (vstream)
                        vstream->avg_frame_rate = flv->framerate;
                } else if (flv->trust_metadata) {
                    if (!strcmp(key, "videocodecid") && vpar) {
                        int ret = flv_set_video_codec(s, vstream, num_val, 0);
                        if (ret < 0)
                            return ret;
                    } else if (!strcmp(key, "audiocodecid") && apar) {
                        int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;
                        flv_set_audio_codec(s, astream, apar, id);
                    } else if (!strcmp(key, "audiosamplerate") && apar) {
                        apar->sample_rate = num_val;
                    } else if (!strcmp(key, "audiosamplesize") && apar) {
                        apar->bits_per_coded_sample = num_val;
                    } else if (!strcmp(key, "stereo") && apar) {
                        av_channel_layout_default(&apar->ch_layout, num_val + 1);
                    } else if (!strcmp(key, "width") && vpar) {
                        vpar->width = num_val;
                    } else if (!strcmp(key, "height") && vpar) {
                        vpar->height = num_val;
                    } else if (!strcmp(key, "datastream")) {
                        AVStream *st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
                        if (!st)
                            return AVERROR(ENOMEM);
                        st->codecpar->codec_id = AV_CODEC_ID_TEXT;
                    }
                }
            }
            if (amf_type == AMF_DATA_TYPE_STRING) {
                if (!strcmp(key, "encoder")) {
                    int version = -1;
                    if (1 == sscanf(str_val, "Open Broadcaster Software v0.%d", &version)) {
                        if (version > 0 && version <= 655)
                            flv->broken_sizes = 1;
                    }
                } else if (!strcmp(key, "metadatacreator")) {
                    if (   !strcmp (str_val, "MEGA")
                        || !strncmp(str_val, "FlixEngine", 10))
                        flv->broken_sizes = 1;
                }
            }
        }

        if (meta_video_color) {
            if (amf_type == AMF_DATA_TYPE_NUMBER ||
                amf_type == AMF_DATA_TYPE_BOOL) {
                if (!strcmp(key, "colorPrimaries")) {
                    meta_video_color->primaries = num_val;
                } else if (!strcmp(key, "transferCharacteristics")) {
                    meta_video_color->transfer_characteristics = num_val;
                } else if (!strcmp(key, "matrixCoefficients")) {
                    meta_video_color->matrix_coefficients = num_val;
                } else if (!strcmp(key, "maxFall")) {
                    meta_video_color->max_fall = num_val;
                } else if (!strcmp(key, "maxCLL")) {
                    meta_video_color->max_cll = num_val;
                } else if (!strcmp(key, "redX")) {
                    meta_video_color->mastering_meta.r_x = num_val;
                } else if (!strcmp(key, "redY")) {
                    meta_video_color->mastering_meta.r_y = num_val;
                } else if (!strcmp(key, "greenX")) {
                    meta_video_color->mastering_meta.g_x = num_val;
                } else if (!strcmp(key, "greenY")) {
                    meta_video_color->mastering_meta.g_y = num_val;
                } else if (!strcmp(key, "blueX")) {
                    meta_video_color->mastering_meta.b_x = num_val;
                } else if (!strcmp(key, "blueY")) {
                    meta_video_color->mastering_meta.b_y = num_val;
                } else if (!strcmp(key, "whitePointX")) {
                    meta_video_color->mastering_meta.white_x = num_val;
                } else if (!strcmp(key, "whitePointY")) {
                    meta_video_color->mastering_meta.white_y = num_val;
                } else if (!strcmp(key, "maxLuminance")) {
                    meta_video_color->mastering_meta.max_luminance = num_val;
                } else if (!strcmp(key, "minLuminance")) {
                    meta_video_color->mastering_meta.min_luminance = num_val;
                }
            }
        }

        if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 &&
           ((!apar && !strcmp(key, "audiocodecid")) ||
            (!vpar && !strcmp(key, "videocodecid"))))
                s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object

        if ((!strcmp(key, "duration")        ||
            !strcmp(key, "filesize")        ||
            !strcmp(key, "width")           ||
            !strcmp(key, "height")          ||
            !strcmp(key, "videodatarate")   ||
            !strcmp(key, "framerate")       ||
            !strcmp(key, "videocodecid")    ||
            !strcmp(key, "audiodatarate")   ||
            !strcmp(key, "audiosamplerate") ||
            !strcmp(key, "audiosamplesize") ||
            !strcmp(key, "stereo")          ||
            !strcmp(key, "audiocodecid")    ||
            !strcmp(key, "datastream")) && !flv->dump_full_metadata)
            return 0;

        s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
        if (amf_type == AMF_DATA_TYPE_BOOL) {
            av_strlcpy(str_val, num_val > 0 ? "true" : "false",
                       sizeof(str_val));
            av_dict_set(&s->metadata, key, str_val, 0);
        } else if (amf_type == AMF_DATA_TYPE_NUMBER) {
            snprintf(str_val, sizeof(str_val), "%.f", num_val);
            av_dict_set(&s->metadata, key, str_val, 0);
        } else if (amf_type == AMF_DATA_TYPE_STRING) {
            av_dict_set(&s->metadata, key, str_val, 0);
        } else if (   amf_type == AMF_DATA_TYPE_DATE
                   && isfinite(date.milliseconds)
                   && date.milliseconds > INT64_MIN/1000
                   && date.milliseconds < INT64_MAX/1000
                  ) {
            // timezone is ignored, since there is no easy way to offset the UTC
            // timestamp into the specified timezone
            avpriv_dict_set_timestamp(&s->metadata, key, 1000 * (int64_t)date.milliseconds);
        }
    }

    return 0;
}

#define TYPE_ONTEXTDATA 1
#define TYPE_ONCAPTION 2
#define TYPE_ONCAPTIONINFO 3
#define TYPE_UNKNOWN 9

static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
{
    FLVContext *flv = s->priv_data;
    AMFDataType type;
    AVStream *stream, *astream, *vstream;
    AVStream av_unused *dstream;
    AVIOContext *ioc;
    int i;
    char buffer[32];

    astream = NULL;
    vstream = NULL;
    dstream = NULL;
    ioc     = s->pb;

    // first object needs to be "onMetaData" string
    type = avio_r8(ioc);
    if (type != AMF_DATA_TYPE_STRING ||
        amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
        return TYPE_UNKNOWN;

    if (!strcmp(buffer, "onTextData"))
        return TYPE_ONTEXTDATA;

    if (!strcmp(buffer, "onCaption"))
        return TYPE_ONCAPTION;

    if (!strcmp(buffer, "onCaptionInfo"))
        return TYPE_ONCAPTIONINFO;

    if (strcmp(buffer, "onMetaData") && strcmp(buffer, "onCuePoint") && strcmp(buffer, "|RtmpSampleAccess")) {
        av_log(s, AV_LOG_DEBUG, "Unknown type %s\n", buffer);
        return TYPE_UNKNOWN;
    }

    // find the streams now so that amf_parse_object doesn't need to do
    // the lookup every time it is called.
    for (i = 0; i < s->nb_streams; i++) {
        stream = s->streams[i];
        if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
            vstream = stream;
            flv->last_keyframe_stream_index = i;
        } else if (stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
            astream = stream;
            if (flv->last_keyframe_stream_index == -1)
                flv->last_keyframe_stream_index = i;
        } else if (stream->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
            dstream = stream;
    }

    // parse the second object (we want a mixed array)
    if (amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
        return -1;

    return 0;
}

static int flv_read_header(AVFormatContext *s)
{
    int flags;
    FLVContext *flv = s->priv_data;
    int offset;
    int pre_tag_size = 0;

    /* Actual FLV data at 0xe40000 in KUX file */
    if(!strcmp(s->iformat->name, "kux"))
        avio_skip(s->pb, 0xe40000);

    avio_skip(s->pb, 4);
    flags = avio_r8(s->pb);

    flv->missing_streams = flags & (FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO);

    s->ctx_flags |= AVFMTCTX_NOHEADER;

    offset = avio_rb32(s->pb);
    avio_seek(s->pb, offset, SEEK_SET);

    /* Annex E. The FLV File Format
     * E.3 TheFLVFileBody
     *     Field               Type    Comment
     *     PreviousTagSize0    UI32    Always 0
     * */
    pre_tag_size = avio_rb32(s->pb);
    if (pre_tag_size) {
        av_log(s, AV_LOG_WARNING, "Read FLV header error, input file is not a standard flv format, first PreviousTagSize0 always is 0\n");
    }

    s->start_time = 0;
    flv->sum_flv_tag_size = 0;
    flv->last_keyframe_stream_index = -1;

    return 0;
}

static int flv_read_close(AVFormatContext *s)
{
    int i;
    FLVContext *flv = s->priv_data;
    for (i=0; i<FLV_STREAM_TYPE_NB; i++)
        av_freep(&flv->new_extradata[i]);
    av_freep(&flv->keyframe_times);
    av_freep(&flv->keyframe_filepositions);
    av_freep(&flv->metaVideoColor);
    return 0;
}

static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
{
    int ret;
    if (!size)
        return 0;

    if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0)
        return ret;
    ffstream(st)->need_context_update = 1;
    return 0;
}

static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
                               int size)
{
    if (!size)
        return 0;

    av_free(flv->new_extradata[stream]);
    flv->new_extradata[stream] = av_mallocz(size +
                                            AV_INPUT_BUFFER_PADDING_SIZE);
    if (!flv->new_extradata[stream])
        return AVERROR(ENOMEM);
    flv->new_extradata_size[stream] = size;
    avio_read(pb, flv->new_extradata[stream], size);
    return 0;
}

static void clear_index_entries(AVFormatContext *s, int64_t pos)
{
    av_log(s, AV_LOG_WARNING,
           "Found invalid index entries, clearing the index.\n");
    for (unsigned i = 0; i < s->nb_streams; i++) {
        FFStream *const sti = ffstream(s->streams[i]);
        int out = 0;
        /* Remove all index entries that point to >= pos */
        for (int j = 0; j < sti->nb_index_entries; j++)
            if (sti->index_entries[j].pos < pos)
                sti->index_entries[out++] = sti->index_entries[j];
        sti->nb_index_entries = out;
    }
}

static int amf_skip_tag(AVIOContext *pb, AMFDataType type, int depth)
{
    int nb = -1, ret, parse_name = 1;

    if (depth > MAX_DEPTH)
        return AVERROR_PATCHWELCOME;

    if (avio_feof(pb))
        return AVERROR_EOF;

    switch (type) {
    case AMF_DATA_TYPE_NUMBER:
        avio_skip(pb, 8);
        break;
    case AMF_DATA_TYPE_BOOL:
        avio_skip(pb, 1);
        break;
    case AMF_DATA_TYPE_STRING:
        avio_skip(pb, avio_rb16(pb));
        break;
    case AMF_DATA_TYPE_ARRAY:
        parse_name = 0;
    case AMF_DATA_TYPE_MIXEDARRAY:
        nb = avio_rb32(pb);
        if (nb < 0)
            return AVERROR_INVALIDDATA;
    case AMF_DATA_TYPE_OBJECT:
        while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) {
            if (parse_name) {
                int size = avio_rb16(pb);
                if (!size) {
                    avio_skip(pb, 1);
                    break;
                }
                avio_skip(pb, size);
            }
            if ((ret = amf_skip_tag(pb, avio_r8(pb), depth + 1)) < 0)
                return ret;
        }
        break;
    case AMF_DATA_TYPE_NULL:
    case AMF_DATA_TYPE_OBJECT_END:
        break;
    default:
        return AVERROR_INVALIDDATA;
    }
    return 0;
}

static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,
                           int64_t dts, int64_t next)
{
    AVIOContext *pb = s->pb;
    AVStream *st    = NULL;
    char buf[20];
    int ret = AVERROR_INVALIDDATA;
    int i, length = -1;
    int array = 0;

    switch (avio_r8(pb)) {
    case AMF_DATA_TYPE_ARRAY:
        array = 1;
    case AMF_DATA_TYPE_MIXEDARRAY:
        avio_seek(pb, 4, SEEK_CUR);
    case AMF_DATA_TYPE_OBJECT:
        break;
    default:
        goto skip;
    }

    while (array || (ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {
        AMFDataType type = avio_r8(pb);
        if (type == AMF_DATA_TYPE_STRING && (array || !strcmp(buf, "text"))) {
            length = avio_rb16(pb);
            ret    = av_get_packet(pb, pkt, length);
            if (ret < 0)
                goto skip;
            else
                break;
        } else {
            if ((ret = amf_skip_tag(pb, type, 0)) < 0)
                goto skip;
        }
    }

    if (length < 0) {
        ret = AVERROR_INVALIDDATA;
        goto skip;
    }

    for (i = 0; i < s->nb_streams; i++) {
        st = s->streams[i];
        if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
            break;
    }

    if (i == s->nb_streams) {
        st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
        if (!st)
            return AVERROR(ENOMEM);
        st->codecpar->codec_id = AV_CODEC_ID_TEXT;
    }

    pkt->dts  = dts;
    pkt->pts  = dts;
    pkt->size = ret;

    pkt->stream_index = st->index;
    pkt->flags       |= AV_PKT_FLAG_KEY;

skip:
    avio_seek(s->pb, next + 4, SEEK_SET);

    return ret;
}

static int resync(AVFormatContext *s)
{
    FLVContext *flv = s->priv_data;
    int64_t i;
    int64_t pos = avio_tell(s->pb);

    for (i=0; !avio_feof(s->pb); i++) {
        int j  = i & (RESYNC_BUFFER_SIZE-1);
        int j1 = j + RESYNC_BUFFER_SIZE;
        flv->resync_buffer[j ] =
        flv->resync_buffer[j1] = avio_r8(s->pb);

        if (i >= 8 && pos) {
            uint8_t *d = flv->resync_buffer + j1 - 8;
            if (d[0] == 'F' &&
                d[1] == 'L' &&
                d[2] == 'V' &&
                d[3] < 5 && d[5] == 0) {
                av_log(s, AV_LOG_WARNING, "Concatenated FLV detected, might fail to demux, decode and seek %"PRId64"\n", flv->last_ts);
                flv->time_offset = flv->last_ts + 1;
                flv->time_pos    = avio_tell(s->pb);
            }
        }

        if (i > 22) {
            unsigned lsize2 = AV_RB32(flv->resync_buffer + j1 - 4);
            if (lsize2 >= 11 && lsize2 + 8LL < FFMIN(i, RESYNC_BUFFER_SIZE)) {
                unsigned  size2 = AV_RB24(flv->resync_buffer + j1 - lsize2 + 1 - 4);
                unsigned lsize1 = AV_RB32(flv->resync_buffer + j1 - lsize2 - 8);
                if (lsize1 >= 11 && lsize1 + 8LL + lsize2 < FFMIN(i, RESYNC_BUFFER_SIZE)) {
                    unsigned  size1 = AV_RB24(flv->resync_buffer + j1 - lsize1 + 1 - lsize2 - 8);
                    if (size1 == lsize1 - 11 && size2  == lsize2 - 11) {
                        avio_seek(s->pb, pos + i - lsize1 - lsize2 - 8, SEEK_SET);
                        return 1;
                    }
                }
            }
        }
    }
    return AVERROR_EOF;
}

static int flv_parse_video_color_info(AVFormatContext *s, AVStream *st, int64_t next_pos)
{
    FLVContext *flv = s->priv_data;
    AMFDataType type;
    AVIOContext *ioc;
    char buffer[32];
    ioc     = s->pb;

    // first object needs to be "colorInfo" string
    type = avio_r8(ioc);
    if (type != AMF_DATA_TYPE_STRING ||
        amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
        return TYPE_UNKNOWN;

    if (strcmp(buffer, "colorInfo")) {
        av_log(s, AV_LOG_DEBUG, "Unknown type %s\n", buffer);
        return TYPE_UNKNOWN;
    }

    if (!(flv->metaVideoColor = av_mallocz(sizeof(FLVMetaVideoColor)))) {
        return AVERROR(ENOMEM);
    }
    flv->meta_color_info_flag = 1;
    amf_parse_object(s, NULL, NULL, buffer, next_pos, 0); // parse metadata
    return 0;
}

static int flv_update_video_color_info(AVFormatContext *s, AVStream *st)
{
    FLVContext *flv = s->priv_data;
    const FLVMetaVideoColor* meta_video_color = flv->metaVideoColor;
    const FLVMasteringMeta *mastering_meta = &meta_video_color->mastering_meta;

    int has_mastering_primaries, has_mastering_luminance;
    // Mastering primaries are CIE 1931 coords, and must be > 0.
    has_mastering_primaries =
        mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
        mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
        mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
        mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
    has_mastering_luminance = mastering_meta->max_luminance > 0 && mastering_meta->min_luminance > 0;

    if (meta_video_color->matrix_coefficients != AVCOL_SPC_RESERVED)
        st->codecpar->color_space = meta_video_color->matrix_coefficients;
    if (meta_video_color->primaries != AVCOL_PRI_RESERVED &&
        meta_video_color->primaries != AVCOL_PRI_RESERVED0)
        st->codecpar->color_primaries = meta_video_color->primaries;
    if (meta_video_color->transfer_characteristics != AVCOL_TRC_RESERVED &&
        meta_video_color->transfer_characteristics != AVCOL_TRC_RESERVED0)
        st->codecpar->color_trc = meta_video_color->transfer_characteristics;

    if (meta_video_color->max_cll && meta_video_color->max_fall) {
        size_t size = 0;
        AVContentLightMetadata *metadata = av_content_light_metadata_alloc(&size);
        if (!metadata)
            return AVERROR(ENOMEM);
        if (!av_packet_side_data_add(&st->codecpar->coded_side_data, &st->codecpar->nb_coded_side_data,
                                        AV_PKT_DATA_CONTENT_LIGHT_LEVEL, metadata, size, 0)) {
            av_freep(&metadata);
            return AVERROR(ENOMEM);
        }
        metadata->MaxCLL  = meta_video_color->max_cll;
        metadata->MaxFALL = meta_video_color->max_fall;
    }

    if (has_mastering_primaries || has_mastering_luminance) {
        AVMasteringDisplayMetadata *metadata;
        AVPacketSideData *sd = av_packet_side_data_new(&st->codecpar->coded_side_data,
                                                        &st->codecpar->nb_coded_side_data,
                                                        AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
                                                        sizeof(AVMasteringDisplayMetadata), 0);
        if (!sd)
            return AVERROR(ENOMEM);
        metadata = (AVMasteringDisplayMetadata*)sd->data;
        memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
        // hdrCll
        if (has_mastering_luminance) {
            metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
            metadata->min_luminance = av_d2q(mastering_meta->min_luminance, INT_MAX);
            metadata->has_luminance = 1;
        }
        // hdrMdcv
        if (has_mastering_primaries) {
            metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
            metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
            metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
            metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
            metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
            metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
            metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
            metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
            metadata->has_primaries = 1;
        }
    }
    return 0;
}

static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    FLVContext *flv = s->priv_data;
    int ret, i, size, flags;
    enum FlvTagType type;
    int stream_type=-1;
    int64_t next, pos, meta_pos;
    int64_t dts, pts = AV_NOPTS_VALUE;
    int av_uninit(channels);
    int av_uninit(sample_rate);
    AVStream *st    = NULL;
    int last = -1;
    int orig_size;
    int enhanced_flv = 0;
    uint32_t video_codec_id = 0;

retry:
    /* pkt size is repeated at end. skip it */
    pos  = avio_tell(s->pb);
    type = (avio_r8(s->pb) & 0x1F);
    orig_size =
    size = avio_rb24(s->pb);
    flv->sum_flv_tag_size += size + 11LL;
    dts  = avio_rb24(s->pb);
    dts |= (unsigned)avio_r8(s->pb) << 24;
    av_log(s, AV_LOG_TRACE, "type:%d, size:%d, last:%d, dts:%"PRId64" pos:%"PRId64"\n", type, size, last, dts, avio_tell(s->pb));
    if (avio_feof(s->pb))
        return AVERROR_EOF;
    avio_skip(s->pb, 3); /* stream id, always 0 */
    flags = 0;

    if (flv->validate_next < flv->validate_count) {
        int64_t validate_pos = flv->validate_index[flv->validate_next].pos;
        if (pos == validate_pos) {
            if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=
                VALIDATE_INDEX_TS_THRESH) {
                flv->validate_next++;
            } else {
                clear_index_entries(s, validate_pos);
                flv->validate_count = 0;
            }
        } else if (pos > validate_pos) {
            clear_index_entries(s, validate_pos);
            flv->validate_count = 0;
        }
    }

    if (size == 0) {
        ret = FFERROR_REDO;
        goto leave;
    }

    next = size + avio_tell(s->pb);

    if (type == FLV_TAG_TYPE_AUDIO) {
        stream_type = FLV_STREAM_TYPE_AUDIO;
        flags    = avio_r8(s->pb);
        size--;
    } else if (type == FLV_TAG_TYPE_VIDEO) {
        stream_type = FLV_STREAM_TYPE_VIDEO;
        flags    = avio_r8(s->pb);
        video_codec_id = flags & FLV_VIDEO_CODECID_MASK;
        /*
         * Reference Enhancing FLV 2023-03-v1.0.0-B.8
         * https://github.com/veovera/enhanced-rtmp/blob/main/enhanced-rtmp-v1.pdf
         * */
        enhanced_flv = (flags >> 7) & 1;
        size--;
        if (enhanced_flv) {
            video_codec_id = avio_rb32(s->pb);
            size -= 4;
        }

        if (enhanced_flv && stream_type == FLV_STREAM_TYPE_VIDEO && (flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD) {
            int pkt_type = flags & 0x0F;
            if (pkt_type == PacketTypeMetadata) {
                int ret = flv_parse_video_color_info(s, st, next);
                av_log(s, AV_LOG_DEBUG, "enhanced flv parse metadata ret %d and skip\n", ret);
            }
            goto skip;
        } else if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD) {
            goto skip;
        }
    } else if (type == FLV_TAG_TYPE_META) {
        stream_type=FLV_STREAM_TYPE_SUBTITLE;
        if (size > 13 + 1 + 4) { // Header-type metadata stuff
            int type;
            meta_pos = avio_tell(s->pb);
            type = flv_read_metabody(s, next);
            if (type == 0 && dts == 0 || type < 0) {
                if (type < 0 && flv->validate_count &&
                    flv->validate_index[0].pos     > next &&
                    flv->validate_index[0].pos - 4 < next) {
                    av_log(s, AV_LOG_WARNING, "Adjusting next position due to index mismatch\n");
                    next = flv->validate_index[0].pos - 4;
                }
                goto skip;
            } else if (type == TYPE_ONTEXTDATA) {
                avpriv_request_sample(s, "OnTextData packet");
                return flv_data_packet(s, pkt, dts, next);
            } else if (type == TYPE_ONCAPTION) {
                return flv_data_packet(s, pkt, dts, next);
            } else if (type == TYPE_UNKNOWN) {
                stream_type = FLV_STREAM_TYPE_DATA;
            }
            avio_seek(s->pb, meta_pos, SEEK_SET);
        }
    } else {
        av_log(s, AV_LOG_DEBUG,
               "Skipping flv packet: type %d, size %d, flags %d.\n",
               type, size, flags);
skip:
        if (avio_seek(s->pb, next, SEEK_SET) != next) {
            // This can happen if flv_read_metabody above read past
            // next, on a non-seekable input, and the preceding data has
            // been flushed out from the IO buffer.
            av_log(s, AV_LOG_ERROR, "Unable to seek to the next packet\n");
            return AVERROR_INVALIDDATA;
        }
        ret = FFERROR_REDO;
        goto leave;
    }

    /* skip empty data packets */
    if (!size) {
        ret = FFERROR_REDO;
        goto leave;
    }

    /* now find stream */
    for (i = 0; i < s->nb_streams; i++) {
        st = s->streams[i];
        if (stream_type == FLV_STREAM_TYPE_AUDIO) {
            if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
                (s->audio_codec_id || flv_same_audio_codec(st->codecpar, flags)))
                break;
        } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
            if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
                (s->video_codec_id || flv_same_video_codec(st->codecpar, video_codec_id)))
                break;
        } else if (stream_type == FLV_STREAM_TYPE_SUBTITLE) {
            if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
                break;
        } else if (stream_type == FLV_STREAM_TYPE_DATA) {
            if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA)
                break;
        }
    }
    if (i == s->nb_streams) {
        static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE, AVMEDIA_TYPE_DATA};
        st = create_stream(s, stream_types[stream_type]);
        if (!st)
            return AVERROR(ENOMEM);
    }
    av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);

    if (flv->time_pos <= pos) {
        dts += flv->time_offset;
    }

    if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
        ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
         stream_type == FLV_STREAM_TYPE_AUDIO))
        av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);

    if ((st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || stream_type == FLV_STREAM_TYPE_AUDIO)) ||
        (st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && stream_type == FLV_STREAM_TYPE_VIDEO)) ||
         st->discard >= AVDISCARD_ALL) {
        avio_seek(s->pb, next, SEEK_SET);
        ret = FFERROR_REDO;
        goto leave;
    }

    // if not streamed and no duration from metadata then seek to end to find
    // the duration from the timestamps
    if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
        (!s->duration || s->duration == AV_NOPTS_VALUE) &&
        !flv->searched_for_end) {
        int size;
        const int64_t pos   = avio_tell(s->pb);
        // Read the last 4 bytes of the file, this should be the size of the
        // previous FLV tag. Use the timestamp of its payload as duration.
        int64_t fsize       = avio_size(s->pb);
retry_duration:
        avio_seek(s->pb, fsize - 4, SEEK_SET);
        size = avio_rb32(s->pb);
        if (size > 0 && size < fsize) {
            // Seek to the start of the last FLV tag at position (fsize - 4 - size)
            // but skip the byte indicating the type.
            avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
            if (size == avio_rb24(s->pb) + 11) {
                uint32_t ts = avio_rb24(s->pb);
                ts         |= (unsigned)avio_r8(s->pb) << 24;
                if (ts)
                    s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
                else if (fsize >= 8 && fsize - 8 >= size) {
                    fsize -= size+4;
                    goto retry_duration;
                }
            }
        }

        avio_seek(s->pb, pos, SEEK_SET);
        flv->searched_for_end = 1;
    }

    if (stream_type == FLV_STREAM_TYPE_AUDIO) {
        int bits_per_coded_sample;
        channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
        sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>
                                FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;
        bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
        if (!av_channel_layout_check(&st->codecpar->ch_layout) ||
            !st->codecpar->sample_rate ||
            !st->codecpar->bits_per_coded_sample) {
            av_channel_layout_default(&st->codecpar->ch_layout, channels);
            st->codecpar->sample_rate           = sample_rate;
            st->codecpar->bits_per_coded_sample = bits_per_coded_sample;
        }
        if (!st->codecpar->codec_id) {
            flv_set_audio_codec(s, st, st->codecpar,
                                flags & FLV_AUDIO_CODECID_MASK);
            flv->last_sample_rate =
            sample_rate           = st->codecpar->sample_rate;
            flv->last_channels    =
            channels              = st->codecpar->ch_layout.nb_channels;
        } else {
            AVCodecParameters *par = avcodec_parameters_alloc();
            if (!par) {
                ret = AVERROR(ENOMEM);
                goto leave;
            }
            par->sample_rate = sample_rate;
            par->bits_per_coded_sample = bits_per_coded_sample;
            flv_set_audio_codec(s, st, par, flags & FLV_AUDIO_CODECID_MASK);
            sample_rate = par->sample_rate;
            avcodec_parameters_free(&par);
        }
    } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
        int ret = flv_set_video_codec(s, st, video_codec_id, 1);
        if (ret < 0)
            return ret;
        size -= ret;
    } else if (stream_type == FLV_STREAM_TYPE_SUBTITLE) {
        st->codecpar->codec_id = AV_CODEC_ID_TEXT;
    } else if (stream_type == FLV_STREAM_TYPE_DATA) {
        st->codecpar->codec_id = AV_CODEC_ID_NONE; // Opaque AMF data
    }

    if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||
        st->codecpar->codec_id == AV_CODEC_ID_H264 ||
        st->codecpar->codec_id == AV_CODEC_ID_MPEG4 ||
        st->codecpar->codec_id == AV_CODEC_ID_HEVC ||
        st->codecpar->codec_id == AV_CODEC_ID_AV1 ||
        st->codecpar->codec_id == AV_CODEC_ID_VP9) {
        int type = 0;
        if (enhanced_flv && stream_type == FLV_STREAM_TYPE_VIDEO) {
            type = flags & 0x0F;
        } else {
            type = avio_r8(s->pb);
            size--;
        }

        if (size < 0) {
            ret = AVERROR_INVALIDDATA;
            goto leave;
        }

        if (enhanced_flv && stream_type == FLV_STREAM_TYPE_VIDEO && flv->meta_color_info_flag) {
            flv_update_video_color_info(s, st); // update av packet side data
            flv->meta_color_info_flag = 0;
        }

        if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4 ||
            (st->codecpar->codec_id == AV_CODEC_ID_HEVC && type == PacketTypeCodedFrames)) {
            // sign extension
            int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
            pts = av_sat_add64(dts, cts);
            if (cts < 0) { // dts might be wrong
                if (!flv->wrong_dts)
                    av_log(s, AV_LOG_WARNING,
                        "Negative cts, previous timestamps might be wrong.\n");
                flv->wrong_dts = 1;
            } else if (FFABS(dts - pts) > 1000*60*15) {
                av_log(s, AV_LOG_WARNING,
                       "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);
                dts = pts = AV_NOPTS_VALUE;
            }
            size -= 3;
        }
        if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||
            st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_HEVC ||
            st->codecpar->codec_id == AV_CODEC_ID_AV1 || st->codecpar->codec_id == AV_CODEC_ID_VP9)) {
            AVDictionaryEntry *t;

            if (st->codecpar->extradata) {
                if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)
                    return ret;
                ret = FFERROR_REDO;
                goto leave;
            }
            if ((ret = flv_get_extradata(s, st, size)) < 0)
                return ret;

            /* Workaround for buggy Omnia A/XE encoder */
            t = av_dict_get(s->metadata, "Encoder", NULL, 0);
            if (st->codecpar->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))
                st->codecpar->extradata_size = 2;

            ret = FFERROR_REDO;
            goto leave;
        }
    }

    /* skip empty data packets */
    if (!size) {
        ret = FFERROR_REDO;
        goto leave;
    }

    ret = av_get_packet(s->pb, pkt, size);
    if (ret < 0)
        return ret;
    pkt->dts          = dts;
    pkt->pts          = pts == AV_NOPTS_VALUE ? dts : pts;
    pkt->stream_index = st->index;
    pkt->pos          = pos;
    if (flv->new_extradata[stream_type]) {
        int ret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
                                          flv->new_extradata[stream_type],
                                          flv->new_extradata_size[stream_type]);
        if (ret >= 0) {
            flv->new_extradata[stream_type]      = NULL;
            flv->new_extradata_size[stream_type] = 0;
        }
    }
    if (stream_type == FLV_STREAM_TYPE_AUDIO &&
                    (sample_rate != flv->last_sample_rate ||
                     channels    != flv->last_channels)) {
        flv->last_sample_rate = sample_rate;
        flv->last_channels    = channels;
        ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
    }

    if (stream_type == FLV_STREAM_TYPE_AUDIO ||
        (flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
        stream_type == FLV_STREAM_TYPE_SUBTITLE ||
        stream_type == FLV_STREAM_TYPE_DATA)
        pkt->flags |= AV_PKT_FLAG_KEY;

leave:
    last = avio_rb32(s->pb);
    if (!flv->trust_datasize) {
        if (last != orig_size + 11 && last != orig_size + 10 &&
            !avio_feof(s->pb) &&
            (last != orig_size || !last) && last != flv->sum_flv_tag_size &&
            !flv->broken_sizes) {
            av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d %"PRId64"\n", last, orig_size + 11, flv->sum_flv_tag_size);
            avio_seek(s->pb, pos + 1, SEEK_SET);
            ret = resync(s);
            av_packet_unref(pkt);
            if (ret >= 0) {
                goto retry;
            }
        }
    }

    if (ret >= 0)
        flv->last_ts = pkt->dts;

    return ret;
}

static int flv_read_seek(AVFormatContext *s, int stream_index,
                         int64_t ts, int flags)
{
    FLVContext *flv = s->priv_data;
    flv->validate_count = 0;
    return avio_seek_time(s->pb, stream_index, ts, flags);
}

#define OFFSET(x) offsetof(FLVContext, x)
#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
    { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
    { "flv_full_metadata", "Dump full metadata of the onMetadata", OFFSET(dump_full_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
    { "flv_ignore_prevtag", "Ignore the Size of previous tag", OFFSET(trust_datasize), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
    { "missing_streams", "", OFFSET(missing_streams), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xFF, VD | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
    { NULL }
};

static const AVClass flv_kux_class = {
    .class_name = "(live) flv/kux demuxer",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

const FFInputFormat ff_flv_demuxer = {
    .p.name         = "flv",
    .p.long_name    = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
    .p.extensions   = "flv",
    .p.priv_class   = &flv_kux_class,
    .priv_data_size = sizeof(FLVContext),
    .read_probe     = flv_probe,
    .read_header    = flv_read_header,
    .read_packet    = flv_read_packet,
    .read_seek      = flv_read_seek,
    .read_close     = flv_read_close,
};

const FFInputFormat ff_live_flv_demuxer = {
    .p.name         = "live_flv",
    .p.long_name    = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),
    .p.extensions   = "flv",
    .p.priv_class   = &flv_kux_class,
    .p.flags        = AVFMT_TS_DISCONT,
    .priv_data_size = sizeof(FLVContext),
    .read_probe     = live_flv_probe,
    .read_header    = flv_read_header,
    .read_packet    = flv_read_packet,
    .read_seek      = flv_read_seek,
    .read_close     = flv_read_close,
};

const FFInputFormat ff_kux_demuxer = {
    .p.name         = "kux",
    .p.long_name    = NULL_IF_CONFIG_SMALL("KUX (YouKu)"),
    .p.extensions   = "kux",
    .p.priv_class   = &flv_kux_class,
    .priv_data_size = sizeof(FLVContext),
    .read_probe     = kux_probe,
    .read_header    = flv_read_header,
    .read_packet    = flv_read_packet,
    .read_seek      = flv_read_seek,
    .read_close     = flv_read_close,
};