aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/mpegtsenc.c
blob: e7d70015aafc99996851969f9fce1896b7028818 (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
/*
 * MPEG2 transport stream (aka DVB) muxer
 * Copyright (c) 2003 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 "libavutil/bswap.h"
#include "libavutil/crc.h"
#include "libavutil/opt.h"
#include "libavcodec/mpegvideo.h"
#include "avformat.h"
#include "internal.h"
#include "mpegts.h"
#include "adts.h"

#define PCR_TIME_BASE 27000000

/* write DVB SI sections */

/*********************************************/
/* mpegts section writer */

typedef struct MpegTSSection {
    int pid;
    int cc;
    void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
    void *opaque;
} MpegTSSection;

typedef struct MpegTSService {
    MpegTSSection pmt; /* MPEG2 pmt table context */
    int sid;           /* service ID */
    char *name;
    char *provider_name;
    int pcr_pid;
    int pcr_packet_count;
    int pcr_packet_period;
} MpegTSService;

typedef struct MpegTSWrite {
    MpegTSSection pat; /* MPEG2 pat table */
    MpegTSSection sdt; /* MPEG2 sdt table context */
    MpegTSService **services;
    int sdt_packet_count;
    int sdt_packet_period;
    int pat_packet_count;
    int pat_packet_period;
    int nb_services;
    int onid;
    int tsid;
    int64_t first_pcr;
    int mux_rate; ///< set to 1 when VBR

    int transport_stream_id;
    int original_network_id;
    int service_id;

    int pmt_start_pid;
    int start_pid;
} MpegTSWrite;

static const AVOption options[] = {
    { "mpegts_transport_stream_id", "Set transport_stream_id field.",
      offsetof(MpegTSWrite, transport_stream_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
    { "mpegts_original_network_id", "Set original_network_id field.",
      offsetof(MpegTSWrite, original_network_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
    { "mpegts_service_id", "Set service_id field.",
      offsetof(MpegTSWrite, service_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
    { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
      offsetof(MpegTSWrite, pmt_start_pid), FF_OPT_TYPE_INT, {.dbl = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
    { "mpegts_start_pid", "Set the first pid.",
      offsetof(MpegTSWrite, start_pid), FF_OPT_TYPE_INT, {.dbl = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
    { NULL },
};

static const AVClass mpegts_muxer_class = {
    .class_name     = "MPEGTS muxer",
    .item_name      = av_default_item_name,
    .option         = options,
    .version        = LIBAVUTIL_VERSION_INT,
};

/* NOTE: 4 bytes must be left at the end for the crc32 */
static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
{
    unsigned int crc;
    unsigned char packet[TS_PACKET_SIZE];
    const unsigned char *buf_ptr;
    unsigned char *q;
    int first, b, len1, left;

    crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
    buf[len - 4] = (crc >> 24) & 0xff;
    buf[len - 3] = (crc >> 16) & 0xff;
    buf[len - 2] = (crc >> 8) & 0xff;
    buf[len - 1] = (crc) & 0xff;

    /* send each packet */
    buf_ptr = buf;
    while (len > 0) {
        first = (buf == buf_ptr);
        q = packet;
        *q++ = 0x47;
        b = (s->pid >> 8);
        if (first)
            b |= 0x40;
        *q++ = b;
        *q++ = s->pid;
        s->cc = (s->cc + 1) & 0xf;
        *q++ = 0x10 | s->cc;
        if (first)
            *q++ = 0; /* 0 offset */
        len1 = TS_PACKET_SIZE - (q - packet);
        if (len1 > len)
            len1 = len;
        memcpy(q, buf_ptr, len1);
        q += len1;
        /* add known padding data */
        left = TS_PACKET_SIZE - (q - packet);
        if (left > 0)
            memset(q, 0xff, left);

        s->write_packet(s, packet);

        buf_ptr += len1;
        len -= len1;
    }
}

static inline void put16(uint8_t **q_ptr, int val)
{
    uint8_t *q;
    q = *q_ptr;
    *q++ = val >> 8;
    *q++ = val;
    *q_ptr = q;
}

static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
                          int version, int sec_num, int last_sec_num,
                          uint8_t *buf, int len)
{
    uint8_t section[1024], *q;
    unsigned int tot_len;
    /* reserved_future_use field must be set to 1 for SDT */
    unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;

    tot_len = 3 + 5 + len + 4;
    /* check if not too big */
    if (tot_len > 1024)
        return -1;

    q = section;
    *q++ = tid;
    put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
    put16(&q, id);
    *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
    *q++ = sec_num;
    *q++ = last_sec_num;
    memcpy(q, buf, len);

    mpegts_write_section(s, section, tot_len);
    return 0;
}

/*********************************************/
/* mpegts writer */

#define DEFAULT_PROVIDER_NAME   "FFmpeg"
#define DEFAULT_SERVICE_NAME    "Service01"

/* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
#define DEFAULT_PES_HEADER_FREQ 16
#define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)

/* we retransmit the SI info at this rate */
#define SDT_RETRANS_TIME 500
#define PAT_RETRANS_TIME 100
#define PCR_RETRANS_TIME 20

typedef struct MpegTSWriteStream {
    struct MpegTSService *service;
    int pid; /* stream associated pid */
    int cc;
    int payload_index;
    int first_pts_check; ///< first pts check needed
    int64_t payload_pts;
    int64_t payload_dts;
    uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
    ADTSContext *adts;
} MpegTSWriteStream;

static void mpegts_write_pat(AVFormatContext *s)
{
    MpegTSWrite *ts = s->priv_data;
    MpegTSService *service;
    uint8_t data[1012], *q;
    int i;

    q = data;
    for(i = 0; i < ts->nb_services; i++) {
        service = ts->services[i];
        put16(&q, service->sid);
        put16(&q, 0xe000 | service->pmt.pid);
    }
    mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
                          data, q - data);
}

static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
{
    //    MpegTSWrite *ts = s->priv_data;
    uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
    int val, stream_type, i;

    q = data;
    put16(&q, 0xe000 | service->pcr_pid);

    program_info_length_ptr = q;
    q += 2; /* patched after */

    /* put program info here */

    val = 0xf000 | (q - program_info_length_ptr - 2);
    program_info_length_ptr[0] = val >> 8;
    program_info_length_ptr[1] = val;

    for(i = 0; i < s->nb_streams; i++) {
        AVStream *st = s->streams[i];
        MpegTSWriteStream *ts_st = st->priv_data;
        AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0);
        switch(st->codec->codec_id) {
        case CODEC_ID_MPEG1VIDEO:
        case CODEC_ID_MPEG2VIDEO:
            stream_type = STREAM_TYPE_VIDEO_MPEG2;
            break;
        case CODEC_ID_MPEG4:
            stream_type = STREAM_TYPE_VIDEO_MPEG4;
            break;
        case CODEC_ID_H264:
            stream_type = STREAM_TYPE_VIDEO_H264;
            break;
        case CODEC_ID_DIRAC:
            stream_type = STREAM_TYPE_VIDEO_DIRAC;
            break;
        case CODEC_ID_MP2:
        case CODEC_ID_MP3:
            stream_type = STREAM_TYPE_AUDIO_MPEG1;
            break;
        case CODEC_ID_AAC:
            stream_type = STREAM_TYPE_AUDIO_AAC;
            break;
        case CODEC_ID_AAC_LATM:
            stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
            break;
        case CODEC_ID_AC3:
            stream_type = STREAM_TYPE_AUDIO_AC3;
            break;
        default:
            stream_type = STREAM_TYPE_PRIVATE_DATA;
            break;
        }
        *q++ = stream_type;
        put16(&q, 0xe000 | ts_st->pid);
        desc_length_ptr = q;
        q += 2; /* patched after */

        /* write optional descriptors here */
        switch(st->codec->codec_type) {
        case AVMEDIA_TYPE_AUDIO:
            if (lang) {
                char *p;
                char *next = lang->value;
                uint8_t *len_ptr;

                *q++ = 0x0a; /* ISO 639 language descriptor */
                len_ptr = q++;
                *len_ptr = 0;

                for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
                    next = strchr(p, ',');
                    if (strlen(p) != 3 && (!next || next != p + 3))
                        continue; /* not a 3-letter code */

                    *q++ = *p++;
                    *q++ = *p++;
                    *q++ = *p++;

                if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
                    *q++ = 0x01;
                else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
                    *q++ = 0x02;
                else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
                    *q++ = 0x03;
                else
                    *q++ = 0; /* undefined type */

                    *len_ptr += 4;
                }

                if (*len_ptr == 0)
                    q -= 2; /* no language codes were written */
            }
            break;
        case AVMEDIA_TYPE_SUBTITLE:
            {
                const char *language;
                language = lang && strlen(lang->value)==3 ? lang->value : "eng";
                *q++ = 0x59;
                *q++ = 8;
                *q++ = language[0];
                *q++ = language[1];
                *q++ = language[2];
                *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
                if(st->codec->extradata_size == 4) {
                    memcpy(q, st->codec->extradata, 4);
                    q += 4;
                } else {
                    put16(&q, 1); /* page id */
                    put16(&q, 1); /* ancillary page id */
                }
            }
            break;
        case AVMEDIA_TYPE_VIDEO:
            if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
                *q++ = 0x05; /*MPEG-2 registration descriptor*/
                *q++ = 4;
                *q++ = 'd';
                *q++ = 'r';
                *q++ = 'a';
                *q++ = 'c';
            }
            break;
        }

        val = 0xf000 | (q - desc_length_ptr - 2);
        desc_length_ptr[0] = val >> 8;
        desc_length_ptr[1] = val;
    }
    mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
                          data, q - data);
}

/* NOTE: str == NULL is accepted for an empty string */
static void putstr8(uint8_t **q_ptr, const char *str)
{
    uint8_t *q;
    int len;

    q = *q_ptr;
    if (!str)
        len = 0;
    else
        len = strlen(str);
    *q++ = len;
    memcpy(q, str, len);
    q += len;
    *q_ptr = q;
}

static void mpegts_write_sdt(AVFormatContext *s)
{
    MpegTSWrite *ts = s->priv_data;
    MpegTSService *service;
    uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
    int i, running_status, free_ca_mode, val;

    q = data;
    put16(&q, ts->onid);
    *q++ = 0xff;
    for(i = 0; i < ts->nb_services; i++) {
        service = ts->services[i];
        put16(&q, service->sid);
        *q++ = 0xfc | 0x00; /* currently no EIT info */
        desc_list_len_ptr = q;
        q += 2;
        running_status = 4; /* running */
        free_ca_mode = 0;

        /* write only one descriptor for the service name and provider */
        *q++ = 0x48;
        desc_len_ptr = q;
        q++;
        *q++ = 0x01; /* digital television service */
        putstr8(&q, service->provider_name);
        putstr8(&q, service->name);
        desc_len_ptr[0] = q - desc_len_ptr - 1;

        /* fill descriptor length */
        val = (running_status << 13) | (free_ca_mode << 12) |
            (q - desc_list_len_ptr - 2);
        desc_list_len_ptr[0] = val >> 8;
        desc_list_len_ptr[1] = val;
    }
    mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
                          data, q - data);
}

static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
                                         int sid,
                                         const char *provider_name,
                                         const char *name)
{
    MpegTSService *service;

    service = av_mallocz(sizeof(MpegTSService));
    if (!service)
        return NULL;
    service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
    service->sid = sid;
    service->provider_name = av_strdup(provider_name);
    service->name = av_strdup(name);
    service->pcr_pid = 0x1fff;
    dynarray_add(&ts->services, &ts->nb_services, service);
    return service;
}

static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
{
    AVFormatContext *ctx = s->opaque;
    avio_write(ctx->pb, packet, TS_PACKET_SIZE);
}

static int mpegts_write_header(AVFormatContext *s)
{
    MpegTSWrite *ts = s->priv_data;
    MpegTSWriteStream *ts_st;
    MpegTSService *service;
    AVStream *st, *pcr_st = NULL;
    AVMetadataTag *title, *provider;
    int i, j;
    const char *service_name;
    const char *provider_name;
    int *pids;

    ts->tsid = ts->transport_stream_id;
    ts->onid = ts->original_network_id;
    /* allocate a single DVB service */
    title = av_metadata_get(s->metadata, "service_name", NULL, 0);
    if (!title)
        title = av_metadata_get(s->metadata, "title", NULL, 0);
    service_name = title ? title->value : DEFAULT_SERVICE_NAME;
    provider = av_metadata_get(s->metadata, "service_provider", NULL, 0);
    provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
    service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
    service->pmt.write_packet = section_write_packet;
    service->pmt.opaque = s;
    service->pmt.cc = 15;

    ts->pat.pid = PAT_PID;
    ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
    ts->pat.write_packet = section_write_packet;
    ts->pat.opaque = s;

    ts->sdt.pid = SDT_PID;
    ts->sdt.cc = 15;
    ts->sdt.write_packet = section_write_packet;
    ts->sdt.opaque = s;

    pids = av_malloc(s->nb_streams * sizeof(*pids));
    if (!pids)
        return AVERROR(ENOMEM);

    /* assign pids to each stream */
    for(i = 0;i < s->nb_streams; i++) {
        st = s->streams[i];
        av_set_pts_info(st, 33, 1, 90000);
        ts_st = av_mallocz(sizeof(MpegTSWriteStream));
        if (!ts_st)
            goto fail;
        st->priv_data = ts_st;
        ts_st->service = service;
        /* MPEG pid values < 16 are reserved. Applications which set st->id in
         * this range are assigned a calculated pid. */
        if (st->id < 16) {
            ts_st->pid = ts->start_pid + i;
        } else if (st->id < 0x1FFF) {
            ts_st->pid = st->id;
        } else {
            av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
            goto fail;
        }
        if (ts_st->pid == service->pmt.pid) {
            av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
            goto fail;
        }
        for (j = 0; j < i; j++)
            if (pids[j] == ts_st->pid) {
                av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
                goto fail;
            }
        pids[i] = ts_st->pid;
        ts_st->payload_pts = AV_NOPTS_VALUE;
        ts_st->payload_dts = AV_NOPTS_VALUE;
        ts_st->first_pts_check = 1;
        ts_st->cc = 15;
        /* update PCR pid by using the first video stream */
        if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
            service->pcr_pid == 0x1fff) {
            service->pcr_pid = ts_st->pid;
            pcr_st = st;
        }
        if (st->codec->codec_id == CODEC_ID_AAC &&
            st->codec->extradata_size > 0) {
            ts_st->adts = av_mallocz(sizeof(*ts_st->adts));
            if (!ts_st->adts)
                return AVERROR(ENOMEM);
            if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata,
                                         st->codec->extradata_size) < 0)
                return -1;
        }
    }

    av_free(pids);

    /* if no video stream, use the first stream as PCR */
    if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
        pcr_st = s->streams[0];
        ts_st = pcr_st->priv_data;
        service->pcr_pid = ts_st->pid;
    }

    ts->mux_rate = s->mux_rate ? s->mux_rate : 1;

    if (ts->mux_rate > 1) {
        service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
            (TS_PACKET_SIZE * 8 * 1000);
        ts->sdt_packet_period      = (ts->mux_rate * SDT_RETRANS_TIME) /
            (TS_PACKET_SIZE * 8 * 1000);
        ts->pat_packet_period      = (ts->mux_rate * PAT_RETRANS_TIME) /
            (TS_PACKET_SIZE * 8 * 1000);

        ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
    } else {
        /* Arbitrary values, PAT/PMT could be written on key frames */
        ts->sdt_packet_period = 200;
        ts->pat_packet_period = 40;
        if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
            if (!pcr_st->codec->frame_size) {
                av_log(s, AV_LOG_WARNING, "frame size not set\n");
                service->pcr_packet_period =
                    pcr_st->codec->sample_rate/(10*512);
            } else {
                service->pcr_packet_period =
                    pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
            }
        } else {
            // max delta PCR 0.1s
            service->pcr_packet_period =
                pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
        }
    }

    // output a PCR as soon as possible
    service->pcr_packet_count = service->pcr_packet_period;
    ts->pat_packet_count = ts->pat_packet_period-1;
    ts->sdt_packet_count = ts->sdt_packet_period-1;

    if (ts->mux_rate == 1)
        av_log(s, AV_LOG_INFO, "muxrate VBR, ");
    else
        av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);
    av_log(s, AV_LOG_INFO, "pcr every %d pkts, "
           "sdt every %d, pat/pmt every %d pkts\n",
           service->pcr_packet_period,
           ts->sdt_packet_period, ts->pat_packet_period);

    avio_flush(s->pb);

    return 0;

 fail:
    av_free(pids);
    for(i = 0;i < s->nb_streams; i++) {
        st = s->streams[i];
        av_freep(&st->priv_data);
    }
    return -1;
}

/* send SDT, PAT and PMT tables regulary */
static void retransmit_si_info(AVFormatContext *s)
{
    MpegTSWrite *ts = s->priv_data;
    int i;

    if (++ts->sdt_packet_count == ts->sdt_packet_period) {
        ts->sdt_packet_count = 0;
        mpegts_write_sdt(s);
    }
    if (++ts->pat_packet_count == ts->pat_packet_period) {
        ts->pat_packet_count = 0;
        mpegts_write_pat(s);
        for(i = 0; i < ts->nb_services; i++) {
            mpegts_write_pmt(s, ts->services[i]);
        }
    }
}

static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
{
    return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
           ts->first_pcr;
}

static uint8_t* write_pcr_bits(uint8_t *buf, int64_t pcr)
{
    int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;

    *buf++ = pcr_high >> 25;
    *buf++ = pcr_high >> 17;
    *buf++ = pcr_high >> 9;
    *buf++ = pcr_high >> 1;
    *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
    *buf++ = pcr_low;

    return buf;
}

/* Write a single null transport stream packet */
static void mpegts_insert_null_packet(AVFormatContext *s)
{
    uint8_t *q;
    uint8_t buf[TS_PACKET_SIZE];

    q = buf;
    *q++ = 0x47;
    *q++ = 0x00 | 0x1f;
    *q++ = 0xff;
    *q++ = 0x10;
    memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
    avio_write(s->pb, buf, TS_PACKET_SIZE);
}

/* Write a single transport stream packet with a PCR and no payload */
static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
{
    MpegTSWrite *ts = s->priv_data;
    MpegTSWriteStream *ts_st = st->priv_data;
    uint8_t *q;
    uint8_t buf[TS_PACKET_SIZE];

    q = buf;
    *q++ = 0x47;
    *q++ = ts_st->pid >> 8;
    *q++ = ts_st->pid;
    *q++ = 0x20 | ts_st->cc;   /* Adaptation only */
    /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
    *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
    *q++ = 0x10;               /* Adaptation flags: PCR present */

    /* PCR coded into 6 bytes */
    q = write_pcr_bits(q, get_pcr(ts, s->pb));

    /* stuffing bytes */
    memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
    avio_write(s->pb, buf, TS_PACKET_SIZE);
}

static void write_pts(uint8_t *q, int fourbits, int64_t pts)
{
    int val;

    val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
    *q++ = val;
    val = (((pts >> 15) & 0x7fff) << 1) | 1;
    *q++ = val >> 8;
    *q++ = val;
    val = (((pts) & 0x7fff) << 1) | 1;
    *q++ = val >> 8;
    *q++ = val;
}

/* Add a pes header to the front of payload, and segment into an integer number of
 * ts packets. The final ts packet is padded using an over-sized adaptation header
 * to exactly fill the last ts packet.
 * NOTE: 'payload' contains a complete PES payload.
 */
static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
                             const uint8_t *payload, int payload_size,
                             int64_t pts, int64_t dts)
{
    MpegTSWriteStream *ts_st = st->priv_data;
    MpegTSWrite *ts = s->priv_data;
    uint8_t buf[TS_PACKET_SIZE];
    uint8_t *q;
    int val, is_start, len, header_len, write_pcr, private_code, flags;
    int afc_len, stuffing_len;
    int64_t pcr = -1; /* avoid warning */
    int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);

    is_start = 1;
    while (payload_size > 0) {
        retransmit_si_info(s);

        write_pcr = 0;
        if (ts_st->pid == ts_st->service->pcr_pid) {
            if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
                ts_st->service->pcr_packet_count++;
            if (ts_st->service->pcr_packet_count >=
                ts_st->service->pcr_packet_period) {
                ts_st->service->pcr_packet_count = 0;
                write_pcr = 1;
            }
        }

        if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
            (dts - get_pcr(ts, s->pb)/300) > delay) {
            /* pcr insert gets priority over null packet insert */
            if (write_pcr)
                mpegts_insert_pcr_only(s, st);
            else
                mpegts_insert_null_packet(s);
            continue; /* recalculate write_pcr and possibly retransmit si_info */
        }

        /* prepare packet header */
        q = buf;
        *q++ = 0x47;
        val = (ts_st->pid >> 8);
        if (is_start)
            val |= 0x40;
        *q++ = val;
        *q++ = ts_st->pid;
        ts_st->cc = (ts_st->cc + 1) & 0xf;
        *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
        if (write_pcr) {
            // add 11, pcr references the last byte of program clock reference base
            if (ts->mux_rate > 1)
                pcr = get_pcr(ts, s->pb);
            else
                pcr = (dts - delay)*300;
            if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
                av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
            *q++ = 7; /* AFC length */
            *q++ = 0x10; /* flags: PCR present */
            q = write_pcr_bits(q, pcr);
        }
        if (is_start) {
            int pes_extension = 0;
            /* write PES header */
            *q++ = 0x00;
            *q++ = 0x00;
            *q++ = 0x01;
            private_code = 0;
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
                if (st->codec->codec_id == CODEC_ID_DIRAC) {
                    *q++ = 0xfd;
                } else
                    *q++ = 0xe0;
            } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
                       (st->codec->codec_id == CODEC_ID_MP2 ||
                        st->codec->codec_id == CODEC_ID_MP3 ||
                        st->codec->codec_id == CODEC_ID_AAC)) {
                *q++ = 0xc0;
            } else {
                *q++ = 0xbd;
                if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
                    private_code = 0x20;
                }
            }
            header_len = 0;
            flags = 0;
            if (pts != AV_NOPTS_VALUE) {
                header_len += 5;
                flags |= 0x80;
            }
            if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
                header_len += 5;
                flags |= 0x40;
            }
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
                st->codec->codec_id == CODEC_ID_DIRAC) {
                /* set PES_extension_flag */
                pes_extension = 1;
                flags |= 0x01;

                /*
                * One byte for PES2 extension flag +
                * one byte for extension length +
                * one byte for extension id
                */
                header_len += 3;
            }
            len = payload_size + header_len + 3;
            if (private_code != 0)
                len++;
            if (len > 0xffff)
                len = 0;
            *q++ = len >> 8;
            *q++ = len;
            val = 0x80;
            /* data alignment indicator is required for subtitle data */
            if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
                val |= 0x04;
            *q++ = val;
            *q++ = flags;
            *q++ = header_len;
            if (pts != AV_NOPTS_VALUE) {
                write_pts(q, flags >> 6, pts);
                q += 5;
            }
            if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
                write_pts(q, 1, dts);
                q += 5;
            }
            if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
                flags = 0x01;  /* set PES_extension_flag_2 */
                *q++ = flags;
                *q++ = 0x80 | 0x01;  /* marker bit + extension length */
                /*
                * Set the stream id extension flag bit to 0 and
                * write the extended stream id
                */
                *q++ = 0x00 | 0x60;
            }
            if (private_code != 0)
                *q++ = private_code;
            is_start = 0;
        }
        /* header size */
        header_len = q - buf;
        /* data len */
        len = TS_PACKET_SIZE - header_len;
        if (len > payload_size)
            len = payload_size;
        stuffing_len = TS_PACKET_SIZE - header_len - len;
        if (stuffing_len > 0) {
            /* add stuffing with AFC */
            if (buf[3] & 0x20) {
                /* stuffing already present: increase its size */
                afc_len = buf[4] + 1;
                memmove(buf + 4 + afc_len + stuffing_len,
                        buf + 4 + afc_len,
                        header_len - (4 + afc_len));
                buf[4] += stuffing_len;
                memset(buf + 4 + afc_len, 0xff, stuffing_len);
            } else {
                /* add stuffing */
                memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
                buf[3] |= 0x20;
                buf[4] = stuffing_len - 1;
                if (stuffing_len >= 2) {
                    buf[5] = 0x00;
                    memset(buf + 6, 0xff, stuffing_len - 2);
                }
            }
        }
        memcpy(buf + TS_PACKET_SIZE - len, payload, len);
        payload += len;
        payload_size -= len;
        avio_write(s->pb, buf, TS_PACKET_SIZE);
    }
    avio_flush(s->pb);
}

static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVStream *st = s->streams[pkt->stream_index];
    int size = pkt->size;
    uint8_t *buf= pkt->data;
    uint8_t *data= NULL;
    MpegTSWriteStream *ts_st = st->priv_data;
    const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
    int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

    if (pkt->pts != AV_NOPTS_VALUE)
        pts = pkt->pts + delay;
    if (pkt->dts != AV_NOPTS_VALUE)
        dts = pkt->dts + delay;

    if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
        av_log(s, AV_LOG_ERROR, "first pts value must set\n");
        return -1;
    }
    ts_st->first_pts_check = 0;

    if (st->codec->codec_id == CODEC_ID_H264) {
        const uint8_t *p = buf, *buf_end = p+size;
        uint32_t state = -1;

        if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
            av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, "
                   "no startcode found, use -vbsf h264_mp4toannexb\n");
            return -1;
        }

        do {
            p = ff_find_start_code(p, buf_end, &state);
            //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);
        } while (p < buf_end && (state & 0x1f) != 9 &&
                 (state & 0x1f) != 5 && (state & 0x1f) != 1);

        if ((state & 0x1f) != 9) { // AUD NAL
            data = av_malloc(pkt->size+6);
            if (!data)
                return -1;
            memcpy(data+6, pkt->data, pkt->size);
            AV_WB32(data, 0x00000001);
            data[4] = 0x09;
            data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
            buf  = data;
            size = pkt->size+6;
        }
    } else if (st->codec->codec_id == CODEC_ID_AAC) {
        if (pkt->size < 2)
            return -1;
        if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
            ADTSContext *adts = ts_st->adts;
            int new_size;
            if (!adts) {
                av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "
                       "and extradata missing\n");
                return -1;
            }
            new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;
            if ((unsigned)new_size >= INT_MAX)
                return -1;
            data = av_malloc(new_size);
            if (!data)
                return AVERROR(ENOMEM);
            ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size);
            if (adts->pce_size) {
                memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);
                adts->pce_size = 0;
            }
            memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);
            buf = data;
            size = new_size;
        }
    }

    if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
        // for video and subtitle, write a single pes packet
        mpegts_write_pes(s, st, buf, size, pts, dts);
        av_free(data);
        return 0;
    }

    if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {
        mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
                         ts_st->payload_pts, ts_st->payload_dts);
        ts_st->payload_index = 0;
    }

    if (!ts_st->payload_index) {
        ts_st->payload_pts = pts;
        ts_st->payload_dts = dts;
    }

    memcpy(ts_st->payload + ts_st->payload_index, buf, size);
    ts_st->payload_index += size;

    av_free(data);

    return 0;
}

static int mpegts_write_end(AVFormatContext *s)
{
    MpegTSWrite *ts = s->priv_data;
    MpegTSWriteStream *ts_st;
    MpegTSService *service;
    AVStream *st;
    int i;

    /* flush current packets */
    for(i = 0; i < s->nb_streams; i++) {
        st = s->streams[i];
        ts_st = st->priv_data;
        if (ts_st->payload_index > 0) {
            mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
                             ts_st->payload_pts, ts_st->payload_dts);
        }
        av_freep(&ts_st->adts);
    }
    avio_flush(s->pb);

    for(i = 0; i < ts->nb_services; i++) {
        service = ts->services[i];
        av_freep(&service->provider_name);
        av_freep(&service->name);
        av_free(service);
    }
    av_free(ts->services);

    return 0;
}

AVOutputFormat ff_mpegts_muxer = {
    "mpegts",
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
    "video/x-mpegts",
    "ts,m2t",
    sizeof(MpegTSWrite),
    CODEC_ID_MP2,
    CODEC_ID_MPEG2VIDEO,
    mpegts_write_header,
    mpegts_write_packet,
    mpegts_write_end,
    .priv_class = &mpegts_muxer_class,
};