libavformat/mpegtsenc.c

   1 /*
   2  * MPEG2 transport stream (aka DVB) muxer
   3  * Copyright (c) 2003 Fabrice Bellard.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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/crc.h"
  23 #include "avformat.h"
  24 #include "mpegts.h"
  25
  26 /* write DVB SI sections */
  27
  28 /*********************************************/
  29 /* mpegts section writer */
  30
  31 typedef struct MpegTSSection {
  32     int pid;
  33     int cc;
  34     void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
  35     void *opaque;
  36 } MpegTSSection;
  37
  38 /* NOTE: 4 bytes must be left at the end for the crc32 */
  39 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
  40 {
  41     unsigned int crc;
  42     unsigned char packet[TS_PACKET_SIZE];
  43     const unsigned char *buf_ptr;
  44     unsigned char *q;
  45     int first, b, len1, left;
  46
  47     crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
  48     buf[len - 4] = (crc >> 24) & 0xff;
  49     buf[len - 3] = (crc >> 16) & 0xff;
  50     buf[len - 2] = (crc >> 8) & 0xff;
  51     buf[len - 1] = (crc) & 0xff;
  52
  53     /* send each packet */
  54     buf_ptr = buf;
  55     while (len > 0) {
  56         first = (buf == buf_ptr);
  57         q = packet;
  58         *q++ = 0x47;
  59         b = (s->pid >> 8);
  60         if (first)
  61             b |= 0x40;
  62         *q++ = b;
  63         *q++ = s->pid;
  64         *q++ = 0x10 | s->cc;
  65         s->cc = (s->cc + 1) & 0xf;
  66         if (first)
  67             *q++ = 0; /* 0 offset */
  68         len1 = TS_PACKET_SIZE - (q - packet);
  69         if (len1 > len)
  70             len1 = len;
  71         memcpy(q, buf_ptr, len1);
  72         q += len1;
  73         /* add known padding data */
  74         left = TS_PACKET_SIZE - (q - packet);
  75         if (left > 0)
  76             memset(q, 0xff, left);
  77
  78         s->write_packet(s, packet);
  79
  80         buf_ptr += len1;
  81         len -= len1;
  82     }
  83 }
  84
  85 static inline void put16(uint8_t **q_ptr, int val)
  86 {
  87     uint8_t *q;
  88     q = *q_ptr;
  89     *q++ = val >> 8;
  90     *q++ = val;
  91     *q_ptr = q;
  92 }
  93
  94 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
  95                           int version, int sec_num, int last_sec_num,
  96                           uint8_t *buf, int len)
  97 {
  98     uint8_t section[1024], *q;
  99     unsigned int tot_len;
 100
 101     tot_len = 3 + 5 + len + 4;
 102     /* check if not too big */
 103     if (tot_len > 1024)
 104         return -1;
 105
 106     q = section;
 107     *q++ = tid;
 108     put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
 109     put16(&q, id);
 110     *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
 111     *q++ = sec_num;
 112     *q++ = last_sec_num;
 113     memcpy(q, buf, len);
 114
 115     mpegts_write_section(s, section, tot_len);
 116     return 0;
 117 }
 118
 119 /*********************************************/
 120 /* mpegts writer */
 121
 122 #define DEFAULT_PMT_START_PID   0x1000
 123 #define DEFAULT_START_PID       0x0100
 124 #define DEFAULT_PROVIDER_NAME   "FFmpeg"
 125 #define DEFAULT_SERVICE_NAME    "Service01"
 126
 127 /* default network id, transport stream and service identifiers */
 128 #define DEFAULT_ONID            0x0001
 129 #define DEFAULT_TSID            0x0001
 130 #define DEFAULT_SID             0x0001
 131
 132 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
 133 #define DEFAULT_PES_HEADER_FREQ 16
 134 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
 135
 136 /* we retransmit the SI info at this rate */
 137 #define SDT_RETRANS_TIME 500
 138 #define PAT_RETRANS_TIME 100
 139 #define PCR_RETRANS_TIME 20
 140
 141 typedef struct MpegTSWriteStream {
 142     struct MpegTSService *service;
 143     int pid; /* stream associated pid */
 144     int cc;
 145     int payload_index;
 146     int64_t payload_pts;
 147     int64_t payload_dts;
 148     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
 149 } MpegTSWriteStream;
 150
 151 typedef struct MpegTSService {
 152     MpegTSSection pmt; /* MPEG2 pmt table context */
 153     int sid;           /* service ID */
 154     char *name;
 155     char *provider_name;
 156     int pcr_pid;
 157     int pcr_packet_count;
 158     int pcr_packet_freq;
 159 } MpegTSService;
 160
 161 typedef struct MpegTSWrite {
 162     MpegTSSection pat; /* MPEG2 pat table */
 163     MpegTSSection sdt; /* MPEG2 sdt table context */
 164     MpegTSService **services;
 165     int sdt_packet_count;
 166     int sdt_packet_freq;
 167     int pat_packet_count;
 168     int pat_packet_freq;
 169     int nb_services;
 170     int onid;
 171     int tsid;
 172 } MpegTSWrite;
 173
 174 static void mpegts_write_pat(AVFormatContext *s)
 175 {
 176     MpegTSWrite *ts = s->priv_data;
 177     MpegTSService *service;
 178     uint8_t data[1012], *q;
 179     int i;
 180
 181     q = data;
 182     for(i = 0; i < ts->nb_services; i++) {
 183         service = ts->services[i];
 184         put16(&q, service->sid);
 185         put16(&q, 0xe000 | service->pmt.pid);
 186     }
 187     mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
 188                           data, q - data);
 189 }
 190
 191 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
 192 {
 193     //    MpegTSWrite *ts = s->priv_data;
 194     uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
 195     int val, stream_type, i;
 196
 197     q = data;
 198     put16(&q, 0xe000 | service->pcr_pid);
 199
 200     program_info_length_ptr = q;
 201     q += 2; /* patched after */
 202
 203     /* put program info here */
 204
 205     val = 0xf000 | (q - program_info_length_ptr - 2);
 206     program_info_length_ptr[0] = val >> 8;
 207     program_info_length_ptr[1] = val;
 208
 209     for(i = 0; i < s->nb_streams; i++) {
 210         AVStream *st = s->streams[i];
 211         MpegTSWriteStream *ts_st = st->priv_data;
 212         switch(st->codec->codec_id) {
 213         case CODEC_ID_MPEG1VIDEO:
 214         case CODEC_ID_MPEG2VIDEO:
 215             stream_type = STREAM_TYPE_VIDEO_MPEG2;
 216             break;
 217         case CODEC_ID_MPEG4:
 218             stream_type = STREAM_TYPE_VIDEO_MPEG4;
 219             break;
 220         case CODEC_ID_H264:
 221             stream_type = STREAM_TYPE_VIDEO_H264;
 222             break;
 223         case CODEC_ID_MP2:
 224         case CODEC_ID_MP3:
 225             stream_type = STREAM_TYPE_AUDIO_MPEG1;
 226             break;
 227         case CODEC_ID_AAC:
 228             stream_type = STREAM_TYPE_AUDIO_AAC;
 229             break;
 230         case CODEC_ID_AC3:
 231             stream_type = STREAM_TYPE_AUDIO_AC3;
 232             break;
 233         default:
 234             stream_type = STREAM_TYPE_PRIVATE_DATA;
 235             break;
 236         }
 237         *q++ = stream_type;
 238         put16(&q, 0xe000 | ts_st->pid);
 239         desc_length_ptr = q;
 240         q += 2; /* patched after */
 241
 242         /* write optional descriptors here */
 243         switch(st->codec->codec_type) {
 244         case CODEC_TYPE_AUDIO:
 245             if (strlen(st->language) == 3) {
 246                 *q++ = 0x0a; /* ISO 639 language descriptor */
 247                 *q++ = 4;
 248                 *q++ = st->language[0];
 249                 *q++ = st->language[1];
 250                 *q++ = st->language[2];
 251                 *q++ = 0; /* undefined type */
 252             }
 253             break;
 254         case CODEC_TYPE_SUBTITLE:
 255             {
 256                 const char *language;
 257                 language = st->language;
 258                 if (strlen(language) != 3)
 259                     language = "eng";
 260                 *q++ = 0x59;
 261                 *q++ = 8;
 262                 *q++ = language[0];
 263                 *q++ = language[1];
 264                 *q++ = language[2];
 265                 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
 266                 put16(&q, 1); /* page id */
 267                 put16(&q, 1); /* ancillary page id */
 268             }
 269             break;
 270         }
 271
 272         val = 0xf000 | (q - desc_length_ptr - 2);
 273         desc_length_ptr[0] = val >> 8;
 274         desc_length_ptr[1] = val;
 275     }
 276     mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
 277                           data, q - data);
 278 }
 279
 280 /* NOTE: str == NULL is accepted for an empty string */
 281 static void putstr8(uint8_t **q_ptr, const char *str)
 282 {
 283     uint8_t *q;
 284     int len;
 285
 286     q = *q_ptr;
 287     if (!str)
 288         len = 0;
 289     else
 290         len = strlen(str);
 291     *q++ = len;
 292     memcpy(q, str, len);
 293     q += len;
 294     *q_ptr = q;
 295 }
 296
 297 static void mpegts_write_sdt(AVFormatContext *s)
 298 {
 299     MpegTSWrite *ts = s->priv_data;
 300     MpegTSService *service;
 301     uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
 302     int i, running_status, free_ca_mode, val;
 303
 304     q = data;
 305     put16(&q, ts->onid);
 306     *q++ = 0xff;
 307     for(i = 0; i < ts->nb_services; i++) {
 308         service = ts->services[i];
 309         put16(&q, service->sid);
 310         *q++ = 0xfc | 0x00; /* currently no EIT info */
 311         desc_list_len_ptr = q;
 312         q += 2;
 313         running_status = 4; /* running */
 314         free_ca_mode = 0;
 315
 316         /* write only one descriptor for the service name and provider */
 317         *q++ = 0x48;
 318         desc_len_ptr = q;
 319         q++;
 320         *q++ = 0x01; /* digital television service */
 321         putstr8(&q, service->provider_name);
 322         putstr8(&q, service->name);
 323         desc_len_ptr[0] = q - desc_len_ptr - 1;
 324
 325         /* fill descriptor length */
 326         val = (running_status << 13) | (free_ca_mode << 12) |
 327             (q - desc_list_len_ptr - 2);
 328         desc_list_len_ptr[0] = val >> 8;
 329         desc_list_len_ptr[1] = val;
 330     }
 331     mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
 332                           data, q - data);
 333 }
 334
 335 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
 336                                          int sid,
 337                                          const char *provider_name,
 338                                          const char *name)
 339 {
 340     MpegTSService *service;
 341
 342     service = av_mallocz(sizeof(MpegTSService));
 343     if (!service)
 344         return NULL;
 345     service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
 346     service->sid = sid;
 347     service->provider_name = av_strdup(provider_name);
 348     service->name = av_strdup(name);
 349     service->pcr_pid = 0x1fff;
 350     dynarray_add(&ts->services, &ts->nb_services, service);
 351     return service;
 352 }
 353
 354 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
 355 {
 356     AVFormatContext *ctx = s->opaque;
 357     put_buffer(ctx->pb, packet, TS_PACKET_SIZE);
 358 }
 359
 360 static int mpegts_write_header(AVFormatContext *s)
 361 {
 362     MpegTSWrite *ts = s->priv_data;
 363     MpegTSWriteStream *ts_st;
 364     MpegTSService *service;
 365     AVStream *st;
 366     int i, total_bit_rate;
 367     const char *service_name;
 368
 369     ts->tsid = DEFAULT_TSID;
 370     ts->onid = DEFAULT_ONID;
 371     /* allocate a single DVB service */
 372     service_name = s->title;
 373     if (service_name[0] == '\0')
 374         service_name = DEFAULT_SERVICE_NAME;
 375     service = mpegts_add_service(ts, DEFAULT_SID,
 376                                  DEFAULT_PROVIDER_NAME, service_name);
 377     service->pmt.write_packet = section_write_packet;
 378     service->pmt.opaque = s;
 379
 380     ts->pat.pid = PAT_PID;
 381     ts->pat.cc = 0;
 382     ts->pat.write_packet = section_write_packet;
 383     ts->pat.opaque = s;
 384
 385     ts->sdt.pid = SDT_PID;
 386     ts->sdt.cc = 0;
 387     ts->sdt.write_packet = section_write_packet;
 388     ts->sdt.opaque = s;
 389
 390     /* assign pids to each stream */
 391     total_bit_rate = 0;
 392     for(i = 0;i < s->nb_streams; i++) {
 393         st = s->streams[i];
 394         ts_st = av_mallocz(sizeof(MpegTSWriteStream));
 395         if (!ts_st)
 396             goto fail;
 397         st->priv_data = ts_st;
 398         ts_st->service = service;
 399         ts_st->pid = DEFAULT_START_PID + i;
 400         ts_st->payload_pts = AV_NOPTS_VALUE;
 401         ts_st->payload_dts = AV_NOPTS_VALUE;
 402         /* update PCR pid by using the first video stream */
 403         if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
 404             service->pcr_pid == 0x1fff)
 405             service->pcr_pid = ts_st->pid;
 406         total_bit_rate += st->codec->bit_rate;
 407     }
 408
 409     /* if no video stream, use the first stream as PCR */
 410     if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
 411         ts_st = s->streams[0]->priv_data;
 412         service->pcr_pid = ts_st->pid;
 413     }
 414
 415     if (total_bit_rate <= 8 * 1024)
 416         total_bit_rate = 8 * 1024;
 417     service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /
 418         (TS_PACKET_SIZE * 8 * 1000);
 419     ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /
 420         (TS_PACKET_SIZE * 8 * 1000);
 421     ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /
 422         (TS_PACKET_SIZE * 8 * 1000);
 423 #if 0
 424     printf("%d %d %d\n",
 425            total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
 426 #endif
 427
 428     /* write info at the start of the file, so that it will be fast to
 429        find them */
 430     mpegts_write_sdt(s);
 431     mpegts_write_pat(s);
 432     for(i = 0; i < ts->nb_services; i++) {
 433         mpegts_write_pmt(s, ts->services[i]);
 434     }
 435     put_flush_packet(s->pb);
 436
 437     return 0;
 438
 439  fail:
 440     for(i = 0;i < s->nb_streams; i++) {
 441         st = s->streams[i];
 442         av_free(st->priv_data);
 443     }
 444     return -1;
 445 }
 446
 447 /* send SDT, PAT and PMT tables regulary */
 448 static void retransmit_si_info(AVFormatContext *s)
 449 {
 450     MpegTSWrite *ts = s->priv_data;
 451     int i;
 452
 453     if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
 454         ts->sdt_packet_count = 0;
 455         mpegts_write_sdt(s);
 456     }
 457     if (++ts->pat_packet_count == ts->pat_packet_freq) {
 458         ts->pat_packet_count = 0;
 459         mpegts_write_pat(s);
 460         for(i = 0; i < ts->nb_services; i++) {
 461             mpegts_write_pmt(s, ts->services[i]);
 462         }
 463     }
 464 }
 465
 466 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
 467 {
 468     int val;
 469
 470     val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
 471     *q++ = val;
 472     val = (((pts >> 15) & 0x7fff) << 1) | 1;
 473     *q++ = val >> 8;
 474     *q++ = val;
 475     val = (((pts) & 0x7fff) << 1) | 1;
 476     *q++ = val >> 8;
 477     *q++ = val;
 478 }
 479
 480 /* NOTE: pes_data contains all the PES packet */
 481 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
 482                              const uint8_t *payload, int payload_size,
 483                              int64_t pts, int64_t dts)
 484 {
 485     MpegTSWriteStream *ts_st = st->priv_data;
 486     uint8_t buf[TS_PACKET_SIZE];
 487     uint8_t *q;
 488     int val, is_start, len, header_len, write_pcr, private_code, flags;
 489     int afc_len, stuffing_len;
 490     int64_t pcr = -1; /* avoid warning */
 491
 492     is_start = 1;
 493     while (payload_size > 0) {
 494         retransmit_si_info(s);
 495
 496         write_pcr = 0;
 497         if (ts_st->pid == ts_st->service->pcr_pid) {
 498             ts_st->service->pcr_packet_count++;
 499             if (ts_st->service->pcr_packet_count >=
 500                 ts_st->service->pcr_packet_freq) {
 501                 ts_st->service->pcr_packet_count = 0;
 502                 write_pcr = 1;
 503                 /* XXX: this is incorrect, but at least we have a PCR
 504                    value */
 505                 pcr = pts;
 506             }
 507         }
 508
 509         /* prepare packet header */
 510         q = buf;
 511         *q++ = 0x47;
 512         val = (ts_st->pid >> 8);
 513         if (is_start)
 514             val |= 0x40;
 515         *q++ = val;
 516         *q++ = ts_st->pid;
 517         *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
 518         ts_st->cc = (ts_st->cc + 1) & 0xf;
 519         if (write_pcr) {
 520             *q++ = 7; /* AFC length */
 521             *q++ = 0x10; /* flags: PCR present */
 522             *q++ = pcr >> 25;
 523             *q++ = pcr >> 17;
 524             *q++ = pcr >> 9;
 525             *q++ = pcr >> 1;
 526             *q++ = (pcr & 1) << 7;
 527             *q++ = 0;
 528         }
 529         if (is_start) {
 530             /* write PES header */
 531             *q++ = 0x00;
 532             *q++ = 0x00;
 533             *q++ = 0x01;
 534             private_code = 0;
 535             if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 536                 *q++ = 0xe0;
 537             } else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&
 538                        (st->codec->codec_id == CODEC_ID_MP2 ||
 539                         st->codec->codec_id == CODEC_ID_MP3)) {
 540                 *q++ = 0xc0;
 541             } else {
 542                 *q++ = 0xbd;
 543                 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
 544                     private_code = 0x20;
 545                 }
 546             }
 547             header_len = 0;
 548             flags = 0;
 549             if (pts != AV_NOPTS_VALUE) {
 550                 header_len += 5;
 551                 flags |= 0x80;
 552             }
 553             if (dts != AV_NOPTS_VALUE) {
 554                 header_len += 5;
 555                 flags |= 0x40;
 556             }
 557             len = payload_size + header_len + 3;
 558             if (private_code != 0)
 559                 len++;
 560             *q++ = len >> 8;
 561             *q++ = len;
 562             val = 0x80;
 563             /* data alignment indicator is required for subtitle data */
 564             if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
 565                 val |= 0x04;
 566             *q++ = val;
 567             *q++ = flags;
 568             *q++ = header_len;
 569             if (pts != AV_NOPTS_VALUE) {
 570                 write_pts(q, flags >> 6, pts);
 571                 q += 5;
 572             }
 573             if (dts != AV_NOPTS_VALUE) {
 574                 write_pts(q, 1, dts);
 575                 q += 5;
 576             }
 577             if (private_code != 0)
 578                 *q++ = private_code;
 579             is_start = 0;
 580         }
 581         /* header size */
 582         header_len = q - buf;
 583         /* data len */
 584         len = TS_PACKET_SIZE - header_len;
 585         if (len > payload_size)
 586             len = payload_size;
 587         stuffing_len = TS_PACKET_SIZE - header_len - len;
 588         if (stuffing_len > 0) {
 589             /* add stuffing with AFC */
 590             if (buf[3] & 0x20) {
 591                 /* stuffing already present: increase its size */
 592                 afc_len = buf[4] + 1;
 593                 memmove(buf + 4 + afc_len + stuffing_len,
 594                         buf + 4 + afc_len,
 595                         header_len - (4 + afc_len));
 596                 buf[4] += stuffing_len;
 597                 memset(buf + 4 + afc_len, 0xff, stuffing_len);
 598             } else {
 599                 /* add stuffing */
 600                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
 601                 buf[3] |= 0x20;
 602                 buf[4] = stuffing_len - 1;
 603                 if (stuffing_len >= 2) {
 604                     buf[5] = 0x00;
 605                     memset(buf + 6, 0xff, stuffing_len - 2);
 606                 }
 607             }
 608         }
 609         memcpy(buf + TS_PACKET_SIZE - len, payload, len);
 610         payload += len;
 611         payload_size -= len;
 612         put_buffer(s->pb, buf, TS_PACKET_SIZE);
 613     }
 614     put_flush_packet(s->pb);
 615 }
 616
 617 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
 618 {
 619     AVStream *st = s->streams[pkt->stream_index];
 620     int size= pkt->size;
 621     uint8_t *buf= pkt->data;
 622     MpegTSWriteStream *ts_st = st->priv_data;
 623     int len, max_payload_size;
 624
 625     if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
 626         /* for subtitle, a single PES packet must be generated */
 627         mpegts_write_pes(s, st, buf, size, pkt->pts, AV_NOPTS_VALUE);
 628         return 0;
 629     }
 630
 631     max_payload_size = DEFAULT_PES_PAYLOAD_SIZE;
 632     while (size > 0) {
 633         len = max_payload_size - ts_st->payload_index;
 634         if (len > size)
 635             len = size;
 636         memcpy(ts_st->payload + ts_st->payload_index, buf, len);
 637         buf += len;
 638         size -= len;
 639         ts_st->payload_index += len;
 640         if (ts_st->payload_pts == AV_NOPTS_VALUE)
 641             ts_st->payload_pts = pkt->pts;
 642         if (ts_st->payload_dts == AV_NOPTS_VALUE)
 643             ts_st->payload_dts = pkt->dts;
 644         if (ts_st->payload_index >= max_payload_size) {
 645             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
 646                              ts_st->payload_pts, ts_st->payload_dts);
 647             ts_st->payload_pts = AV_NOPTS_VALUE;
 648             ts_st->payload_dts = AV_NOPTS_VALUE;
 649             ts_st->payload_index = 0;
 650         }
 651     }
 652     return 0;
 653 }
 654
 655 static int mpegts_write_end(AVFormatContext *s)
 656 {
 657     MpegTSWrite *ts = s->priv_data;
 658     MpegTSWriteStream *ts_st;
 659     MpegTSService *service;
 660     AVStream *st;
 661     int i;
 662
 663     /* flush current packets */
 664     for(i = 0; i < s->nb_streams; i++) {
 665         st = s->streams[i];
 666         ts_st = st->priv_data;
 667         if (ts_st->payload_index > 0) {
 668             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
 669                              ts_st->payload_pts, ts_st->payload_dts);
 670         }
 671     }
 672     put_flush_packet(s->pb);
 673
 674     for(i = 0; i < ts->nb_services; i++) {
 675         service = ts->services[i];
 676         av_freep(&service->provider_name);
 677         av_freep(&service->name);
 678         av_free(service);
 679     }
 680     av_free(ts->services);
 681
 682     return 0;
 683 }
 684
 685 AVOutputFormat mpegts_muxer = {
 686     "mpegts",
 687     NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
 688     "video/x-mpegts",
 689     "ts,m2t",
 690     sizeof(MpegTSWrite),
 691     CODEC_ID_MP2,
 692     CODEC_ID_MPEG2VIDEO,
 693     mpegts_write_header,
 694     mpegts_write_packet,
 695     mpegts_write_end,
 696 };