libavformat/mpegtsenc.c

   1 /*
   2  * MPEG2 transport stream (aka DVB) muxer
   3  * Copyright (c) 2003 Fabrice Bellard
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/bswap.h"
  23 #include "libavutil/crc.h"
  24 #include "libavutil/dict.h"
  25 #include "libavutil/intreadwrite.h"
  26 #include "libavutil/mathematics.h"
  27 #include "libavutil/opt.h"
  28 #include "libavcodec/internal.h"
  29 #include "avformat.h"
  30 #include "internal.h"
  31 #include "mpegts.h"
  32
  33 #define PCR_TIME_BASE 27000000
  34
  35 /* write DVB SI sections */
  36
  37 /*********************************************/
  38 /* mpegts section writer */
  39
  40 typedef struct MpegTSSection {
  41     int pid;
  42     int cc;
  43     void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
  44     void *opaque;
  45 } MpegTSSection;
  46
  47 typedef struct MpegTSService {
  48     MpegTSSection pmt; /* MPEG2 pmt table context */
  49     int sid;           /* service ID */
  50     char *name;
  51     char *provider_name;
  52     int pcr_pid;
  53     int pcr_packet_count;
  54     int pcr_packet_period;
  55 } MpegTSService;
  56
  57 typedef struct MpegTSWrite {
  58     const AVClass *av_class;
  59     MpegTSSection pat; /* MPEG2 pat table */
  60     MpegTSSection sdt; /* MPEG2 sdt table context */
  61     MpegTSService **services;
  62     int sdt_packet_count;
  63     int sdt_packet_period;
  64     int pat_packet_count;
  65     int pat_packet_period;
  66     int nb_services;
  67     int onid;
  68     int tsid;
  69     int64_t first_pcr;
  70     int mux_rate; ///< set to 1 when VBR
  71     int pes_payload_size;
  72
  73     int transport_stream_id;
  74     int original_network_id;
  75     int service_id;
  76
  77     int pmt_start_pid;
  78     int start_pid;
  79
  80     int reemit_pat_pmt; // backward compatibility
  81
  82 #define MPEGTS_FLAG_REEMIT_PAT_PMT  0x01
  83 #define MPEGTS_FLAG_AAC_LATM        0x02
  84     int flags;
  85 } MpegTSWrite;
  86
  87 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
  88 #define DEFAULT_PES_HEADER_FREQ 16
  89 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
  90
  91 static const AVOption options[] = {
  92     { "mpegts_transport_stream_id", "Set transport_stream_id field.",
  93       offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
  94     { "mpegts_original_network_id", "Set original_network_id field.",
  95       offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
  96     { "mpegts_service_id", "Set service_id field.",
  97       offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
  98     { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
  99       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
 100     { "mpegts_start_pid", "Set the first pid.",
 101       offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
 102     { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
 103     { "pes_payload_size", "Minimum PES packet payload in bytes",
 104       offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
 105     { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX,
 106       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
 107     { "resend_headers", "Reemit PAT/PMT before writing the next packet",
 108       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,
 109       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
 110     { "latm", "Use LATM packetization for AAC",
 111       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,
 112       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
 113     // backward compatibility
 114     { "resend_headers", "Reemit PAT/PMT before writing the next packet",
 115       offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
 116     { NULL },
 117 };
 118
 119 static const AVClass mpegts_muxer_class = {
 120     .class_name     = "MPEGTS muxer",
 121     .item_name      = av_default_item_name,
 122     .option         = options,
 123     .version        = LIBAVUTIL_VERSION_INT,
 124 };
 125
 126 /* NOTE: 4 bytes must be left at the end for the crc32 */
 127 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
 128 {
 129     unsigned int crc;
 130     unsigned char packet[TS_PACKET_SIZE];
 131     const unsigned char *buf_ptr;
 132     unsigned char *q;
 133     int first, b, len1, left;
 134
 135     crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
 136     buf[len - 4] = (crc >> 24) & 0xff;
 137     buf[len - 3] = (crc >> 16) & 0xff;
 138     buf[len - 2] = (crc >> 8) & 0xff;
 139     buf[len - 1] = (crc) & 0xff;
 140
 141     /* send each packet */
 142     buf_ptr = buf;
 143     while (len > 0) {
 144         first = (buf == buf_ptr);
 145         q = packet;
 146         *q++ = 0x47;
 147         b = (s->pid >> 8);
 148         if (first)
 149             b |= 0x40;
 150         *q++ = b;
 151         *q++ = s->pid;
 152         s->cc = (s->cc + 1) & 0xf;
 153         *q++ = 0x10 | s->cc;
 154         if (first)
 155             *q++ = 0; /* 0 offset */
 156         len1 = TS_PACKET_SIZE - (q - packet);
 157         if (len1 > len)
 158             len1 = len;
 159         memcpy(q, buf_ptr, len1);
 160         q += len1;
 161         /* add known padding data */
 162         left = TS_PACKET_SIZE - (q - packet);
 163         if (left > 0)
 164             memset(q, 0xff, left);
 165
 166         s->write_packet(s, packet);
 167
 168         buf_ptr += len1;
 169         len -= len1;
 170     }
 171 }
 172
 173 static inline void put16(uint8_t **q_ptr, int val)
 174 {
 175     uint8_t *q;
 176     q = *q_ptr;
 177     *q++ = val >> 8;
 178     *q++ = val;
 179     *q_ptr = q;
 180 }
 181
 182 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
 183                           int version, int sec_num, int last_sec_num,
 184                           uint8_t *buf, int len)
 185 {
 186     uint8_t section[1024], *q;
 187     unsigned int tot_len;
 188     /* reserved_future_use field must be set to 1 for SDT */
 189     unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
 190
 191     tot_len = 3 + 5 + len + 4;
 192     /* check if not too big */
 193     if (tot_len > 1024)
 194         return -1;
 195
 196     q = section;
 197     *q++ = tid;
 198     put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
 199     put16(&q, id);
 200     *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
 201     *q++ = sec_num;
 202     *q++ = last_sec_num;
 203     memcpy(q, buf, len);
 204
 205     mpegts_write_section(s, section, tot_len);
 206     return 0;
 207 }
 208
 209 /*********************************************/
 210 /* mpegts writer */
 211
 212 #define DEFAULT_PROVIDER_NAME   "Libav"
 213 #define DEFAULT_SERVICE_NAME    "Service01"
 214
 215 /* we retransmit the SI info at this rate */
 216 #define SDT_RETRANS_TIME 500
 217 #define PAT_RETRANS_TIME 100
 218 #define PCR_RETRANS_TIME 20
 219
 220 typedef struct MpegTSWriteStream {
 221     struct MpegTSService *service;
 222     int pid; /* stream associated pid */
 223     int cc;
 224     int payload_size;
 225     int first_pts_check; ///< first pts check needed
 226     int64_t payload_pts;
 227     int64_t payload_dts;
 228     int payload_flags;
 229     uint8_t *payload;
 230     AVFormatContext *amux;
 231 } MpegTSWriteStream;
 232
 233 static void mpegts_write_pat(AVFormatContext *s)
 234 {
 235     MpegTSWrite *ts = s->priv_data;
 236     MpegTSService *service;
 237     uint8_t data[1012], *q;
 238     int i;
 239
 240     q = data;
 241     for(i = 0; i < ts->nb_services; i++) {
 242         service = ts->services[i];
 243         put16(&q, service->sid);
 244         put16(&q, 0xe000 | service->pmt.pid);
 245     }
 246     mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
 247                           data, q - data);
 248 }
 249
 250 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
 251 {
 252     MpegTSWrite *ts = s->priv_data;
 253     uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
 254     int val, stream_type, i;
 255
 256     q = data;
 257     put16(&q, 0xe000 | service->pcr_pid);
 258
 259     program_info_length_ptr = q;
 260     q += 2; /* patched after */
 261
 262     /* put program info here */
 263
 264     val = 0xf000 | (q - program_info_length_ptr - 2);
 265     program_info_length_ptr[0] = val >> 8;
 266     program_info_length_ptr[1] = val;
 267
 268     for(i = 0; i < s->nb_streams; i++) {
 269         AVStream *st = s->streams[i];
 270         MpegTSWriteStream *ts_st = st->priv_data;
 271         AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
 272         switch(st->codec->codec_id) {
 273         case AV_CODEC_ID_MPEG1VIDEO:
 274         case AV_CODEC_ID_MPEG2VIDEO:
 275             stream_type = STREAM_TYPE_VIDEO_MPEG2;
 276             break;
 277         case AV_CODEC_ID_MPEG4:
 278             stream_type = STREAM_TYPE_VIDEO_MPEG4;
 279             break;
 280         case AV_CODEC_ID_H264:
 281             stream_type = STREAM_TYPE_VIDEO_H264;
 282             break;
 283         case AV_CODEC_ID_CAVS:
 284             stream_type = STREAM_TYPE_VIDEO_CAVS;
 285             break;
 286         case AV_CODEC_ID_DIRAC:
 287             stream_type = STREAM_TYPE_VIDEO_DIRAC;
 288             break;
 289         case AV_CODEC_ID_MP2:
 290         case AV_CODEC_ID_MP3:
 291             stream_type = STREAM_TYPE_AUDIO_MPEG1;
 292             break;
 293         case AV_CODEC_ID_AAC:
 294             stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM) ? STREAM_TYPE_AUDIO_AAC_LATM : STREAM_TYPE_AUDIO_AAC;
 295             break;
 296         case AV_CODEC_ID_AAC_LATM:
 297             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
 298             break;
 299         case AV_CODEC_ID_AC3:
 300             stream_type = STREAM_TYPE_AUDIO_AC3;
 301             break;
 302         default:
 303             stream_type = STREAM_TYPE_PRIVATE_DATA;
 304             break;
 305         }
 306         *q++ = stream_type;
 307         put16(&q, 0xe000 | ts_st->pid);
 308         desc_length_ptr = q;
 309         q += 2; /* patched after */
 310
 311         /* write optional descriptors here */
 312         switch(st->codec->codec_type) {
 313         case AVMEDIA_TYPE_AUDIO:
 314             if (lang) {
 315                 char *p;
 316                 char *next = lang->value;
 317                 uint8_t *len_ptr;
 318
 319                 *q++ = 0x0a; /* ISO 639 language descriptor */
 320                 len_ptr = q++;
 321                 *len_ptr = 0;
 322
 323                 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
 324                     next = strchr(p, ',');
 325                     if (strlen(p) != 3 && (!next || next != p + 3))
 326                         continue; /* not a 3-letter code */
 327
 328                     *q++ = *p++;
 329                     *q++ = *p++;
 330                     *q++ = *p++;
 331
 332                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
 333                     *q++ = 0x01;
 334                 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
 335                     *q++ = 0x02;
 336                 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
 337                     *q++ = 0x03;
 338                 else
 339                     *q++ = 0; /* undefined type */
 340
 341                     *len_ptr += 4;
 342                 }
 343
 344                 if (*len_ptr == 0)
 345                     q -= 2; /* no language codes were written */
 346             }
 347             break;
 348         case AVMEDIA_TYPE_SUBTITLE:
 349             {
 350                 const char *language;
 351                 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
 352                 *q++ = 0x59;
 353                 *q++ = 8;
 354                 *q++ = language[0];
 355                 *q++ = language[1];
 356                 *q++ = language[2];
 357                 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
 358                 if(st->codec->extradata_size == 4) {
 359                     memcpy(q, st->codec->extradata, 4);
 360                     q += 4;
 361                 } else {
 362                     put16(&q, 1); /* page id */
 363                     put16(&q, 1); /* ancillary page id */
 364                 }
 365             }
 366             break;
 367         case AVMEDIA_TYPE_VIDEO:
 368             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
 369                 *q++ = 0x05; /*MPEG-2 registration descriptor*/
 370                 *q++ = 4;
 371                 *q++ = 'd';
 372                 *q++ = 'r';
 373                 *q++ = 'a';
 374                 *q++ = 'c';
 375             }
 376             break;
 377         }
 378
 379         val = 0xf000 | (q - desc_length_ptr - 2);
 380         desc_length_ptr[0] = val >> 8;
 381         desc_length_ptr[1] = val;
 382     }
 383     mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
 384                           data, q - data);
 385 }
 386
 387 /* NOTE: str == NULL is accepted for an empty string */
 388 static void putstr8(uint8_t **q_ptr, const char *str)
 389 {
 390     uint8_t *q;
 391     int len;
 392
 393     q = *q_ptr;
 394     if (!str)
 395         len = 0;
 396     else
 397         len = strlen(str);
 398     *q++ = len;
 399     memcpy(q, str, len);
 400     q += len;
 401     *q_ptr = q;
 402 }
 403
 404 static void mpegts_write_sdt(AVFormatContext *s)
 405 {
 406     MpegTSWrite *ts = s->priv_data;
 407     MpegTSService *service;
 408     uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
 409     int i, running_status, free_ca_mode, val;
 410
 411     q = data;
 412     put16(&q, ts->onid);
 413     *q++ = 0xff;
 414     for(i = 0; i < ts->nb_services; i++) {
 415         service = ts->services[i];
 416         put16(&q, service->sid);
 417         *q++ = 0xfc | 0x00; /* currently no EIT info */
 418         desc_list_len_ptr = q;
 419         q += 2;
 420         running_status = 4; /* running */
 421         free_ca_mode = 0;
 422
 423         /* write only one descriptor for the service name and provider */
 424         *q++ = 0x48;
 425         desc_len_ptr = q;
 426         q++;
 427         *q++ = 0x01; /* digital television service */
 428         putstr8(&q, service->provider_name);
 429         putstr8(&q, service->name);
 430         desc_len_ptr[0] = q - desc_len_ptr - 1;
 431
 432         /* fill descriptor length */
 433         val = (running_status << 13) | (free_ca_mode << 12) |
 434             (q - desc_list_len_ptr - 2);
 435         desc_list_len_ptr[0] = val >> 8;
 436         desc_list_len_ptr[1] = val;
 437     }
 438     mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
 439                           data, q - data);
 440 }
 441
 442 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
 443                                          int sid,
 444                                          const char *provider_name,
 445                                          const char *name)
 446 {
 447     MpegTSService *service;
 448
 449     service = av_mallocz(sizeof(MpegTSService));
 450     if (!service)
 451         return NULL;
 452     service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
 453     service->sid = sid;
 454     service->provider_name = av_strdup(provider_name);
 455     service->name = av_strdup(name);
 456     service->pcr_pid = 0x1fff;
 457     dynarray_add(&ts->services, &ts->nb_services, service);
 458     return service;
 459 }
 460
 461 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
 462 {
 463     AVFormatContext *ctx = s->opaque;
 464     avio_write(ctx->pb, packet, TS_PACKET_SIZE);
 465 }
 466
 467 static int mpegts_write_header(AVFormatContext *s)
 468 {
 469     MpegTSWrite *ts = s->priv_data;
 470     MpegTSWriteStream *ts_st;
 471     MpegTSService *service;
 472     AVStream *st, *pcr_st = NULL;
 473     AVDictionaryEntry *title, *provider;
 474     int i, j;
 475     const char *service_name;
 476     const char *provider_name;
 477     int *pids;
 478     int ret;
 479
 480     if (s->max_delay < 0) /* Not set by the caller */
 481         s->max_delay = 0;
 482
 483     // round up to a whole number of TS packets
 484     ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
 485
 486     ts->tsid = ts->transport_stream_id;
 487     ts->onid = ts->original_network_id;
 488     /* allocate a single DVB service */
 489     title = av_dict_get(s->metadata, "service_name", NULL, 0);
 490     if (!title)
 491         title = av_dict_get(s->metadata, "title", NULL, 0);
 492     service_name = title ? title->value : DEFAULT_SERVICE_NAME;
 493     provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
 494     provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
 495     service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
 496     service->pmt.write_packet = section_write_packet;
 497     service->pmt.opaque = s;
 498     service->pmt.cc = 15;
 499
 500     ts->pat.pid = PAT_PID;
 501     ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
 502     ts->pat.write_packet = section_write_packet;
 503     ts->pat.opaque = s;
 504
 505     ts->sdt.pid = SDT_PID;
 506     ts->sdt.cc = 15;
 507     ts->sdt.write_packet = section_write_packet;
 508     ts->sdt.opaque = s;
 509
 510     pids = av_malloc(s->nb_streams * sizeof(*pids));
 511     if (!pids)
 512         return AVERROR(ENOMEM);
 513
 514     /* assign pids to each stream */
 515     for(i = 0;i < s->nb_streams; i++) {
 516         st = s->streams[i];
 517         avpriv_set_pts_info(st, 33, 1, 90000);
 518         ts_st = av_mallocz(sizeof(MpegTSWriteStream));
 519         if (!ts_st) {
 520             ret = AVERROR(ENOMEM);
 521             goto fail;
 522         }
 523         st->priv_data = ts_st;
 524         ts_st->payload = av_mallocz(ts->pes_payload_size);
 525         if (!ts_st->payload) {
 526             ret = AVERROR(ENOMEM);
 527             goto fail;
 528         }
 529         ts_st->service = service;
 530         /* MPEG pid values < 16 are reserved. Applications which set st->id in
 531          * this range are assigned a calculated pid. */
 532         if (st->id < 16) {
 533             ts_st->pid = ts->start_pid + i;
 534         } else if (st->id < 0x1FFF) {
 535             ts_st->pid = st->id;
 536         } else {
 537             av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
 538             ret = AVERROR(EINVAL);
 539             goto fail;
 540         }
 541         if (ts_st->pid == service->pmt.pid) {
 542             av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
 543             ret = AVERROR(EINVAL);
 544             goto fail;
 545         }
 546         for (j = 0; j < i; j++)
 547             if (pids[j] == ts_st->pid) {
 548                 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
 549                 ret = AVERROR(EINVAL);
 550                 goto fail;
 551             }
 552         pids[i] = ts_st->pid;
 553         ts_st->payload_pts = AV_NOPTS_VALUE;
 554         ts_st->payload_dts = AV_NOPTS_VALUE;
 555         ts_st->first_pts_check = 1;
 556         ts_st->cc = 15;
 557         /* update PCR pid by using the first video stream */
 558         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
 559             service->pcr_pid == 0x1fff) {
 560             service->pcr_pid = ts_st->pid;
 561             pcr_st = st;
 562         }
 563         if (st->codec->codec_id == AV_CODEC_ID_AAC &&
 564             st->codec->extradata_size > 0)
 565         {
 566             AVStream *ast;
 567             ts_st->amux = avformat_alloc_context();
 568             if (!ts_st->amux) {
 569                 ret = AVERROR(ENOMEM);
 570                 goto fail;
 571             }
 572             ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL);
 573             if (!ts_st->amux->oformat) {
 574                 ret = AVERROR(EINVAL);
 575                 goto fail;
 576             }
 577             ast = avformat_new_stream(ts_st->amux, NULL);
 578             ret = avcodec_copy_context(ast->codec, st->codec);
 579             if (ret != 0)
 580                 goto fail;
 581             ret = avformat_write_header(ts_st->amux, NULL);
 582             if (ret < 0)
 583                 goto fail;
 584         }
 585     }
 586
 587     av_free(pids);
 588
 589     /* if no video stream, use the first stream as PCR */
 590     if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
 591         pcr_st = s->streams[0];
 592         ts_st = pcr_st->priv_data;
 593         service->pcr_pid = ts_st->pid;
 594     }
 595
 596     if (ts->mux_rate > 1) {
 597         service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
 598             (TS_PACKET_SIZE * 8 * 1000);
 599         ts->sdt_packet_period      = (ts->mux_rate * SDT_RETRANS_TIME) /
 600             (TS_PACKET_SIZE * 8 * 1000);
 601         ts->pat_packet_period      = (ts->mux_rate * PAT_RETRANS_TIME) /
 602             (TS_PACKET_SIZE * 8 * 1000);
 603
 604         ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
 605     } else {
 606         /* Arbitrary values, PAT/PMT could be written on key frames */
 607         ts->sdt_packet_period = 200;
 608         ts->pat_packet_period = 40;
 609         if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
 610             if (!pcr_st->codec->frame_size) {
 611                 av_log(s, AV_LOG_WARNING, "frame size not set\n");
 612                 service->pcr_packet_period =
 613                     pcr_st->codec->sample_rate/(10*512);
 614             } else {
 615                 service->pcr_packet_period =
 616                     pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
 617             }
 618         } else {
 619             // max delta PCR 0.1s
 620             service->pcr_packet_period =
 621                 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
 622         }
 623     }
 624
 625     // output a PCR as soon as possible
 626     service->pcr_packet_count = service->pcr_packet_period;
 627     ts->pat_packet_count = ts->pat_packet_period-1;
 628     ts->sdt_packet_count = ts->sdt_packet_period-1;
 629
 630     if (ts->mux_rate == 1)
 631         av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
 632     else
 633         av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
 634     av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, "
 635            "sdt every %d, pat/pmt every %d pkts\n",
 636            service->pcr_packet_period,
 637            ts->sdt_packet_period, ts->pat_packet_period);
 638
 639     avio_flush(s->pb);
 640
 641     return 0;
 642
 643  fail:
 644     av_free(pids);
 645     for(i = 0;i < s->nb_streams; i++) {
 646         MpegTSWriteStream *ts_st;
 647         st = s->streams[i];
 648         ts_st = st->priv_data;
 649         if (ts_st) {
 650             av_freep(&ts_st->payload);
 651             if (ts_st->amux) {
 652                 avformat_free_context(ts_st->amux);
 653                 ts_st->amux = NULL;
 654             }
 655         }
 656         av_freep(&st->priv_data);
 657     }
 658     return ret;
 659 }
 660
 661 /* send SDT, PAT and PMT tables regulary */
 662 static void retransmit_si_info(AVFormatContext *s)
 663 {
 664     MpegTSWrite *ts = s->priv_data;
 665     int i;
 666
 667     if (++ts->sdt_packet_count == ts->sdt_packet_period) {
 668         ts->sdt_packet_count = 0;
 669         mpegts_write_sdt(s);
 670     }
 671     if (++ts->pat_packet_count == ts->pat_packet_period) {
 672         ts->pat_packet_count = 0;
 673         mpegts_write_pat(s);
 674         for(i = 0; i < ts->nb_services; i++) {
 675             mpegts_write_pmt(s, ts->services[i]);
 676         }
 677     }
 678 }
 679
 680 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
 681 {
 682     return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
 683            ts->first_pcr;
 684 }
 685
 686 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
 687 {
 688     int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
 689
 690     *buf++ = pcr_high >> 25;
 691     *buf++ = pcr_high >> 17;
 692     *buf++ = pcr_high >> 9;
 693     *buf++ = pcr_high >> 1;
 694     *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
 695     *buf++ = pcr_low;
 696
 697     return 6;
 698 }
 699
 700 /* Write a single null transport stream packet */
 701 static void mpegts_insert_null_packet(AVFormatContext *s)
 702 {
 703     uint8_t *q;
 704     uint8_t buf[TS_PACKET_SIZE];
 705
 706     q = buf;
 707     *q++ = 0x47;
 708     *q++ = 0x00 | 0x1f;
 709     *q++ = 0xff;
 710     *q++ = 0x10;
 711     memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
 712     avio_write(s->pb, buf, TS_PACKET_SIZE);
 713 }
 714
 715 /* Write a single transport stream packet with a PCR and no payload */
 716 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
 717 {
 718     MpegTSWrite *ts = s->priv_data;
 719     MpegTSWriteStream *ts_st = st->priv_data;
 720     uint8_t *q;
 721     uint8_t buf[TS_PACKET_SIZE];
 722
 723     q = buf;
 724     *q++ = 0x47;
 725     *q++ = ts_st->pid >> 8;
 726     *q++ = ts_st->pid;
 727     *q++ = 0x20 | ts_st->cc;   /* Adaptation only */
 728     /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
 729     *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
 730     *q++ = 0x10;               /* Adaptation flags: PCR present */
 731
 732     /* PCR coded into 6 bytes */
 733     q += write_pcr_bits(q, get_pcr(ts, s->pb));
 734
 735     /* stuffing bytes */
 736     memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
 737     avio_write(s->pb, buf, TS_PACKET_SIZE);
 738 }
 739
 740 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
 741 {
 742     int val;
 743
 744     val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
 745     *q++ = val;
 746     val = (((pts >> 15) & 0x7fff) << 1) | 1;
 747     *q++ = val >> 8;
 748     *q++ = val;
 749     val = (((pts) & 0x7fff) << 1) | 1;
 750     *q++ = val >> 8;
 751     *q++ = val;
 752 }
 753
 754 /* Set an adaptation field flag in an MPEG-TS packet*/
 755 static void set_af_flag(uint8_t *pkt, int flag)
 756 {
 757     // expect at least one flag to set
 758     assert(flag);
 759
 760     if ((pkt[3] & 0x20) == 0) {
 761         // no AF yet, set adaptation field flag
 762         pkt[3] |= 0x20;
 763         // 1 byte length, no flags
 764         pkt[4] = 1;
 765         pkt[5] = 0;
 766     }
 767     pkt[5] |= flag;
 768 }
 769
 770 /* Extend the adaptation field by size bytes */
 771 static void extend_af(uint8_t *pkt, int size)
 772 {
 773     // expect already existing adaptation field
 774     assert(pkt[3] & 0x20);
 775     pkt[4] += size;
 776 }
 777
 778 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
 779 static uint8_t *get_ts_payload_start(uint8_t *pkt)
 780 {
 781     if (pkt[3] & 0x20)
 782         return pkt + 5 + pkt[4];
 783     else
 784         return pkt + 4;
 785 }
 786
 787 /* Add a pes header to the front of payload, and segment into an integer number of
 788  * ts packets. The final ts packet is padded using an over-sized adaptation header
 789  * to exactly fill the last ts packet.
 790  * NOTE: 'payload' contains a complete PES payload.
 791  */
 792 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
 793                              const uint8_t *payload, int payload_size,
 794                              int64_t pts, int64_t dts, int key)
 795 {
 796     MpegTSWriteStream *ts_st = st->priv_data;
 797     MpegTSWrite *ts = s->priv_data;
 798     uint8_t buf[TS_PACKET_SIZE];
 799     uint8_t *q;
 800     int val, is_start, len, header_len, write_pcr, private_code, flags;
 801     int afc_len, stuffing_len;
 802     int64_t pcr = -1; /* avoid warning */
 803     int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
 804
 805     is_start = 1;
 806     while (payload_size > 0) {
 807         retransmit_si_info(s);
 808
 809         write_pcr = 0;
 810         if (ts_st->pid == ts_st->service->pcr_pid) {
 811             if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
 812                 ts_st->service->pcr_packet_count++;
 813             if (ts_st->service->pcr_packet_count >=
 814                 ts_st->service->pcr_packet_period) {
 815                 ts_st->service->pcr_packet_count = 0;
 816                 write_pcr = 1;
 817             }
 818         }
 819
 820         if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
 821             (dts - get_pcr(ts, s->pb)/300) > delay) {
 822             /* pcr insert gets priority over null packet insert */
 823             if (write_pcr)
 824                 mpegts_insert_pcr_only(s, st);
 825             else
 826                 mpegts_insert_null_packet(s);
 827             continue; /* recalculate write_pcr and possibly retransmit si_info */
 828         }
 829
 830         /* prepare packet header */
 831         q = buf;
 832         *q++ = 0x47;
 833         val = (ts_st->pid >> 8);
 834         if (is_start)
 835             val |= 0x40;
 836         *q++ = val;
 837         *q++ = ts_st->pid;
 838         ts_st->cc = (ts_st->cc + 1) & 0xf;
 839         *q++ = 0x10 | ts_st->cc; // payload indicator + CC
 840         if (key && is_start && pts != AV_NOPTS_VALUE) {
 841             // set Random Access for key frames
 842             if (ts_st->pid == ts_st->service->pcr_pid)
 843                 write_pcr = 1;
 844             set_af_flag(buf, 0x40);
 845             q = get_ts_payload_start(buf);
 846         }
 847         if (write_pcr) {
 848             set_af_flag(buf, 0x10);
 849             q = get_ts_payload_start(buf);
 850             // add 11, pcr references the last byte of program clock reference base
 851             if (ts->mux_rate > 1)
 852                 pcr = get_pcr(ts, s->pb);
 853             else
 854                 pcr = (dts - delay)*300;
 855             if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
 856                 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
 857             extend_af(buf, write_pcr_bits(q, pcr));
 858             q = get_ts_payload_start(buf);
 859         }
 860         if (is_start) {
 861             int pes_extension = 0;
 862             /* write PES header */
 863             *q++ = 0x00;
 864             *q++ = 0x00;
 865             *q++ = 0x01;
 866             private_code = 0;
 867             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 868                 if (st->codec->codec_id == AV_CODEC_ID_DIRAC) {
 869                     *q++ = 0xfd;
 870                 } else
 871                     *q++ = 0xe0;
 872             } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
 873                        (st->codec->codec_id == AV_CODEC_ID_MP2 ||
 874                         st->codec->codec_id == AV_CODEC_ID_MP3 ||
 875                         st->codec->codec_id == AV_CODEC_ID_AAC)) {
 876                 *q++ = 0xc0;
 877             } else {
 878                 *q++ = 0xbd;
 879                 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 880                     private_code = 0x20;
 881                 }
 882             }
 883             header_len = 0;
 884             flags = 0;
 885             if (pts != AV_NOPTS_VALUE) {
 886                 header_len += 5;
 887                 flags |= 0x80;
 888             }
 889             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
 890                 header_len += 5;
 891                 flags |= 0x40;
 892             }
 893             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
 894                 st->codec->codec_id == AV_CODEC_ID_DIRAC) {
 895                 /* set PES_extension_flag */
 896                 pes_extension = 1;
 897                 flags |= 0x01;
 898
 899                 /*
 900                 * One byte for PES2 extension flag +
 901                 * one byte for extension length +
 902                 * one byte for extension id
 903                 */
 904                 header_len += 3;
 905             }
 906             len = payload_size + header_len + 3;
 907             if (private_code != 0)
 908                 len++;
 909             if (len > 0xffff)
 910                 len = 0;
 911             *q++ = len >> 8;
 912             *q++ = len;
 913             val = 0x80;
 914             /* data alignment indicator is required for subtitle data */
 915             if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
 916                 val |= 0x04;
 917             *q++ = val;
 918             *q++ = flags;
 919             *q++ = header_len;
 920             if (pts != AV_NOPTS_VALUE) {
 921                 write_pts(q, flags >> 6, pts);
 922                 q += 5;
 923             }
 924             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
 925                 write_pts(q, 1, dts);
 926                 q += 5;
 927             }
 928             if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {
 929                 flags = 0x01;  /* set PES_extension_flag_2 */
 930                 *q++ = flags;
 931                 *q++ = 0x80 | 0x01;  /* marker bit + extension length */
 932                 /*
 933                 * Set the stream id extension flag bit to 0 and
 934                 * write the extended stream id
 935                 */
 936                 *q++ = 0x00 | 0x60;
 937             }
 938             if (private_code != 0)
 939                 *q++ = private_code;
 940             is_start = 0;
 941         }
 942         /* header size */
 943         header_len = q - buf;
 944         /* data len */
 945         len = TS_PACKET_SIZE - header_len;
 946         if (len > payload_size)
 947             len = payload_size;
 948         stuffing_len = TS_PACKET_SIZE - header_len - len;
 949         if (stuffing_len > 0) {
 950             /* add stuffing with AFC */
 951             if (buf[3] & 0x20) {
 952                 /* stuffing already present: increase its size */
 953                 afc_len = buf[4] + 1;
 954                 memmove(buf + 4 + afc_len + stuffing_len,
 955                         buf + 4 + afc_len,
 956                         header_len - (4 + afc_len));
 957                 buf[4] += stuffing_len;
 958                 memset(buf + 4 + afc_len, 0xff, stuffing_len);
 959             } else {
 960                 /* add stuffing */
 961                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
 962                 buf[3] |= 0x20;
 963                 buf[4] = stuffing_len - 1;
 964                 if (stuffing_len >= 2) {
 965                     buf[5] = 0x00;
 966                     memset(buf + 6, 0xff, stuffing_len - 2);
 967                 }
 968             }
 969         }
 970         memcpy(buf + TS_PACKET_SIZE - len, payload, len);
 971         payload += len;
 972         payload_size -= len;
 973         avio_write(s->pb, buf, TS_PACKET_SIZE);
 974     }
 975     avio_flush(s->pb);
 976 }
 977
 978 static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
 979 {
 980     AVStream *st = s->streams[pkt->stream_index];
 981     int size = pkt->size;
 982     uint8_t *buf= pkt->data;
 983     uint8_t *data= NULL;
 984     MpegTSWrite *ts = s->priv_data;
 985     MpegTSWriteStream *ts_st = st->priv_data;
 986     const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
 987     int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
 988
 989     if (ts->reemit_pat_pmt) {
 990         av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
 991         ts->reemit_pat_pmt = 0;
 992         ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;
 993     }
 994
 995     if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
 996         ts->pat_packet_count = ts->pat_packet_period - 1;
 997         ts->sdt_packet_count = ts->sdt_packet_period - 1;
 998         ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
 999     }
1000
1001     if (pkt->pts != AV_NOPTS_VALUE)
1002         pts = pkt->pts + delay;
1003     if (pkt->dts != AV_NOPTS_VALUE)
1004         dts = pkt->dts + delay;
1005
1006     if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
1007         av_log(s, AV_LOG_ERROR, "first pts value must set\n");
1008         return AVERROR(EINVAL);
1009     }
1010     ts_st->first_pts_check = 0;
1011
1012     if (st->codec->codec_id == AV_CODEC_ID_H264) {
1013         const uint8_t *p = buf, *buf_end = p+size;
1014         uint32_t state = -1;
1015
1016         if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
1017             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
1018                    "no startcode found, use -bsf h264_mp4toannexb\n");
1019             return AVERROR(EINVAL);
1020         }
1021
1022         do {
1023             p = avpriv_find_start_code(p, buf_end, &state);
1024             av_dlog(s, "nal %d\n", state & 0x1f);
1025         } while (p < buf_end && (state & 0x1f) != 9 &&
1026                  (state & 0x1f) != 5 && (state & 0x1f) != 1);
1027
1028         if ((state & 0x1f) != 9) { // AUD NAL
1029             data = av_malloc(pkt->size+6);
1030             if (!data)
1031                 return AVERROR(ENOMEM);
1032             memcpy(data+6, pkt->data, pkt->size);
1033             AV_WB32(data, 0x00000001);
1034             data[4] = 0x09;
1035             data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1036             buf  = data;
1037             size = pkt->size+6;
1038         }
1039     } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {
1040         if (pkt->size < 2) {
1041             av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
1042             return AVERROR(EINVAL);
1043         }
1044         if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
1045             int ret;
1046             AVPacket pkt2;
1047
1048             if (!ts_st->amux) {
1049                 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
1050                        "and extradata missing\n");
1051                 return AVERROR(EINVAL);
1052             }
1053
1054             av_init_packet(&pkt2);
1055             pkt2.data = pkt->data;
1056             pkt2.size = pkt->size;
1057             ret = avio_open_dyn_buf(&ts_st->amux->pb);
1058             if (ret < 0)
1059                 return AVERROR(ENOMEM);
1060
1061             ret = av_write_frame(ts_st->amux, &pkt2);
1062             if (ret < 0) {
1063                 avio_close_dyn_buf(ts_st->amux->pb, &data);
1064                 ts_st->amux->pb = NULL;
1065                 av_free(data);
1066                 return ret;
1067             }
1068             size = avio_close_dyn_buf(ts_st->amux->pb, &data);
1069             ts_st->amux->pb = NULL;
1070             buf = data;
1071         }
1072     }
1073
1074     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
1075         // for video and subtitle, write a single pes packet
1076         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);
1077         av_free(data);
1078         return 0;
1079     }
1080
1081     if (ts_st->payload_size + size > ts->pes_payload_size) {
1082         if (ts_st->payload_size) {
1083             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1084                              ts_st->payload_pts, ts_st->payload_dts,
1085                              ts_st->payload_flags & AV_PKT_FLAG_KEY);
1086             ts_st->payload_size = 0;
1087         }
1088         if (size > ts->pes_payload_size) {
1089             mpegts_write_pes(s, st, buf, size, pts, dts,
1090                              pkt->flags & AV_PKT_FLAG_KEY);
1091             av_free(data);
1092             return 0;
1093         }
1094     }
1095
1096     if (!ts_st->payload_size) {
1097         ts_st->payload_pts = pts;
1098         ts_st->payload_dts = dts;
1099         ts_st->payload_flags = pkt->flags;
1100     }
1101
1102     memcpy(ts_st->payload + ts_st->payload_size, buf, size);
1103     ts_st->payload_size += size;
1104
1105     av_free(data);
1106
1107     return 0;
1108 }
1109
1110 static void mpegts_write_flush(AVFormatContext *s)
1111 {
1112     int i;
1113
1114     /* flush current packets */
1115     for(i = 0; i < s->nb_streams; i++) {
1116         AVStream *st = s->streams[i];
1117         MpegTSWriteStream *ts_st = st->priv_data;
1118         if (ts_st->payload_size > 0) {
1119             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1120                              ts_st->payload_pts, ts_st->payload_dts,
1121                              ts_st->payload_flags & AV_PKT_FLAG_KEY);
1122             ts_st->payload_size = 0;
1123         }
1124     }
1125     avio_flush(s->pb);
1126 }
1127
1128 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
1129 {
1130     if (!pkt) {
1131         mpegts_write_flush(s);
1132         return 1;
1133     } else {
1134         return mpegts_write_packet_internal(s, pkt);
1135     }
1136 }
1137
1138 static int mpegts_write_end(AVFormatContext *s)
1139 {
1140     MpegTSWrite *ts = s->priv_data;
1141     MpegTSService *service;
1142     int i;
1143
1144     mpegts_write_flush(s);
1145
1146     for(i = 0; i < s->nb_streams; i++) {
1147         AVStream *st = s->streams[i];
1148         MpegTSWriteStream *ts_st = st->priv_data;
1149         av_freep(&ts_st->payload);
1150         if (ts_st->amux) {
1151             avformat_free_context(ts_st->amux);
1152             ts_st->amux = NULL;
1153         }
1154     }
1155
1156     for(i = 0; i < ts->nb_services; i++) {
1157         service = ts->services[i];
1158         av_freep(&service->provider_name);
1159         av_freep(&service->name);
1160         av_free(service);
1161     }
1162     av_free(ts->services);
1163
1164     return 0;
1165 }
1166
1167 AVOutputFormat ff_mpegts_muxer = {
1168     .name              = "mpegts",
1169     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
1170     .mime_type         = "video/x-mpegts",
1171     .extensions        = "ts,m2t",
1172     .priv_data_size    = sizeof(MpegTSWrite),
1173     .audio_codec       = AV_CODEC_ID_MP2,
1174     .video_codec       = AV_CODEC_ID_MPEG2VIDEO,
1175     .write_header      = mpegts_write_header,
1176     .write_packet      = mpegts_write_packet,
1177     .write_trailer     = mpegts_write_end,
1178     .flags             = AVFMT_ALLOW_FLUSH,
1179     .priv_class        = &mpegts_muxer_class,
1180 };