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 #include "avformat.h"
  22 #include "crc.h"
  23 #include "mpegts.h"
  24
  25 /* write DVB SI sections */
  26
  27 /*********************************************/
  28 /* mpegts section writer */
  29
  30 typedef struct MpegTSSection {
  31     int pid;
  32     int cc;
  33     void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
  34     void *opaque;
  35 } MpegTSSection;
  36
  37 /* NOTE: 4 bytes must be left at the end for the crc32 */
  38 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
  39 {
  40     unsigned int crc;
  41     unsigned char packet[TS_PACKET_SIZE];
  42     const unsigned char *buf_ptr;
  43     unsigned char *q;
  44     int first, b, len1, left;
  45
  46     crc = bswap_32(av_crc(av_crc04C11DB7, -1, buf, len - 4));
  47     buf[len - 4] = (crc >> 24) & 0xff;
  48     buf[len - 3] = (crc >> 16) & 0xff;
  49     buf[len - 2] = (crc >> 8) & 0xff;
  50     buf[len - 1] = (crc) & 0xff;
  51
  52     /* send each packet */
  53     buf_ptr = buf;
  54     while (len > 0) {
  55         first = (buf == buf_ptr);
  56         q = packet;
  57         *q++ = 0x47;
  58         b = (s->pid >> 8);
  59         if (first)
  60             b |= 0x40;
  61         *q++ = b;
  62         *q++ = s->pid;
  63         s->cc = (s->cc + 1) & 0xf;
  64         *q++ = 0x10 | s->cc;
  65         if (first)
  66             *q++ = 0; /* 0 offset */
  67         len1 = TS_PACKET_SIZE - (q - packet);
  68         if (len1 > len)
  69             len1 = len;
  70         memcpy(q, buf_ptr, len1);
  71         q += len1;
  72         /* add known padding data */
  73         left = TS_PACKET_SIZE - (q - packet);
  74         if (left > 0)
  75             memset(q, 0xff, left);
  76
  77         s->write_packet(s, packet);
  78
  79         buf_ptr += len1;
  80         len -= len1;
  81     }
  82 }
  83
  84 static inline void put16(uint8_t **q_ptr, int val)
  85 {
  86     uint8_t *q;
  87     q = *q_ptr;
  88     *q++ = val >> 8;
  89     *q++ = val;
  90     *q_ptr = q;
  91 }
  92
  93 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
  94                           int version, int sec_num, int last_sec_num,
  95                           uint8_t *buf, int len)
  96 {
  97     uint8_t section[1024], *q;
  98     unsigned int tot_len;
  99
 100     tot_len = 3 + 5 + len + 4;
 101     /* check if not too big */
 102     if (tot_len > 1024)
 103         return -1;
 104
 105     q = section;
 106     *q++ = tid;
 107     put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
 108     put16(&q, id);
 109     *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
 110     *q++ = sec_num;
 111     *q++ = last_sec_num;
 112     memcpy(q, buf, len);
 113
 114     mpegts_write_section(s, section, tot_len);
 115     return 0;
 116 }
 117
 118 /*********************************************/
 119 /* mpegts writer */
 120
 121 #define DEFAULT_PMT_START_PID   0x1000
 122 #define DEFAULT_START_PID       0x0100
 123 #define DEFAULT_PROVIDER_NAME   "FFmpeg"
 124 #define DEFAULT_SERVICE_NAME    "Service01"
 125
 126 /* default network id, transport stream and service identifiers */
 127 #define DEFAULT_ONID            0x0001
 128 #define DEFAULT_TSID            0x0001
 129 #define DEFAULT_SID             0x0001
 130
 131 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
 132 #define DEFAULT_PES_HEADER_FREQ 16
 133 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
 134
 135 /* we retransmit the SI info at this rate */
 136 #define SDT_RETRANS_TIME 500
 137 #define PAT_RETRANS_TIME 100
 138 #define PCR_RETRANS_TIME 20
 139
 140 typedef struct MpegTSWriteStream {
 141     struct MpegTSService *service;
 142     int pid; /* stream associated pid */
 143     int cc;
 144     int payload_index;
 145     int64_t payload_pts;
 146     int64_t payload_dts;
 147     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
 148 } MpegTSWriteStream;
 149
 150 typedef struct MpegTSService {
 151     MpegTSSection pmt; /* MPEG2 pmt table context */
 152     int sid;           /* service ID */
 153     char *name;
 154     char *provider_name;
 155     int pcr_pid;
 156     int pcr_packet_count;
 157     int pcr_packet_freq;
 158 } MpegTSService;
 159
 160 typedef struct MpegTSWrite {
 161     MpegTSSection pat; /* MPEG2 pat table */
 162     MpegTSSection sdt; /* MPEG2 sdt table context */
 163     MpegTSService **services;
 164     int sdt_packet_count;
 165     int sdt_packet_freq;
 166     int pat_packet_count;
 167     int pat_packet_freq;
 168     int nb_services;
 169     int onid;
 170     int tsid;
 171 } MpegTSWrite;
 172
 173 static void mpegts_write_pat(AVFormatContext *s)
 174 {
 175     MpegTSWrite *ts = s->priv_data;
 176     MpegTSService *service;
 177     uint8_t data[1012], *q;
 178     int i;
 179
 180     q = data;
 181     for(i = 0; i < ts->nb_services; i++) {
 182         service = ts->services[i];
 183         put16(&q, service->sid);
 184         put16(&q, 0xe000 | service->pmt.pid);
 185     }
 186     mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
 187                           data, q - data);
 188 }
 189
 190 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
 191 {
 192     //    MpegTSWrite *ts = s->priv_data;
 193     uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
 194     int val, stream_type, i;
 195
 196     q = data;
 197     put16(&q, 0xe000 | service->pcr_pid);
 198
 199     program_info_length_ptr = q;
 200     q += 2; /* patched after */
 201
 202     /* put program info here */
 203
 204     val = 0xf000 | (q - program_info_length_ptr - 2);
 205     program_info_length_ptr[0] = val >> 8;
 206     program_info_length_ptr[1] = val;
 207
 208     for(i = 0; i < s->nb_streams; i++) {
 209         AVStream *st = s->streams[i];
 210         MpegTSWriteStream *ts_st = st->priv_data;
 211         switch(st->codec->codec_id) {
 212         case CODEC_ID_MPEG1VIDEO:
 213         case CODEC_ID_MPEG2VIDEO:
 214             stream_type = STREAM_TYPE_VIDEO_MPEG2;
 215             break;
 216         case CODEC_ID_MPEG4:
 217             stream_type = STREAM_TYPE_VIDEO_MPEG4;
 218             break;
 219         case CODEC_ID_H264:
 220             stream_type = STREAM_TYPE_VIDEO_H264;
 221             break;
 222         case CODEC_ID_MP2:
 223         case CODEC_ID_MP3:
 224             stream_type = STREAM_TYPE_AUDIO_MPEG1;
 225             break;
 226         case CODEC_ID_AAC:
 227             stream_type = STREAM_TYPE_AUDIO_AAC;
 228             break;
 229         case CODEC_ID_AC3:
 230             stream_type = STREAM_TYPE_AUDIO_AC3;
 231             break;
 232         default:
 233             stream_type = STREAM_TYPE_PRIVATE_DATA;
 234             break;
 235         }
 236         *q++ = stream_type;
 237         put16(&q, 0xe000 | ts_st->pid);
 238         desc_length_ptr = q;
 239         q += 2; /* patched after */
 240
 241         /* write optional descriptors here */
 242         switch(st->codec->codec_type) {
 243         case CODEC_TYPE_AUDIO:
 244             if (strlen(st->language) == 3) {
 245                 *q++ = 0x0a; /* ISO 639 language descriptor */
 246                 *q++ = 4;
 247                 *q++ = st->language[0];
 248                 *q++ = st->language[1];
 249                 *q++ = st->language[2];
 250                 *q++ = 0; /* undefined type */
 251             }
 252             break;
 253         case CODEC_TYPE_SUBTITLE:
 254             {
 255                 const char *language;
 256                 language = st->language;
 257                 if (strlen(language) != 3)
 258                     language = "eng";
 259                 *q++ = 0x59;
 260                 *q++ = 8;
 261                 *q++ = language[0];
 262                 *q++ = language[1];
 263                 *q++ = language[2];
 264                 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
 265                 put16(&q, 1); /* page id */
 266                 put16(&q, 1); /* ancillary page id */
 267             }
 268             break;
 269         }
 270
 271         val = 0xf000 | (q - desc_length_ptr - 2);
 272         desc_length_ptr[0] = val >> 8;
 273         desc_length_ptr[1] = val;
 274     }
 275     mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
 276                           data, q - data);
 277 }
 278
 279 /* NOTE: str == NULL is accepted for an empty string */
 280 static void putstr8(uint8_t **q_ptr, const char *str)
 281 {
 282     uint8_t *q;
 283     int len;
 284
 285     q = *q_ptr;
 286     if (!str)
 287         len = 0;
 288     else
 289         len = strlen(str);
 290     *q++ = len;
 291     memcpy(q, str, len);
 292     q += len;
 293     *q_ptr = q;
 294 }
 295
 296 static void mpegts_write_sdt(AVFormatContext *s)
 297 {
 298     MpegTSWrite *ts = s->priv_data;
 299     MpegTSService *service;
 300     uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
 301     int i, running_status, free_ca_mode, val;
 302
 303     q = data;
 304     put16(&q, ts->onid);
 305     *q++ = 0xff;
 306     for(i = 0; i < ts->nb_services; i++) {
 307         service = ts->services[i];
 308         put16(&q, service->sid);
 309         *q++ = 0xfc | 0x00; /* currently no EIT info */
 310         desc_list_len_ptr = q;
 311         q += 2;
 312         running_status = 4; /* running */
 313         free_ca_mode = 0;
 314
 315         /* write only one descriptor for the service name and provider */
 316         *q++ = 0x48;
 317         desc_len_ptr = q;
 318         q++;
 319         *q++ = 0x01; /* digital television service */
 320         putstr8(&q, service->provider_name);
 321         putstr8(&q, service->name);
 322         desc_len_ptr[0] = q - desc_len_ptr - 1;
 323
 324         /* fill descriptor length */
 325         val = (running_status << 13) | (free_ca_mode << 12) |
 326             (q - desc_list_len_ptr - 2);
 327         desc_list_len_ptr[0] = val >> 8;
 328         desc_list_len_ptr[1] = val;
 329     }
 330     mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
 331                           data, q - data);
 332 }
 333
 334 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
 335                                          int sid,
 336                                          const char *provider_name,
 337                                          const char *name)
 338 {
 339     MpegTSService *service;
 340
 341     service = av_mallocz(sizeof(MpegTSService));
 342     if (!service)
 343         return NULL;
 344     service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
 345     service->sid = sid;
 346     service->provider_name = av_strdup(provider_name);
 347     service->name = av_strdup(name);
 348     service->pcr_pid = 0x1fff;
 349     dynarray_add(&ts->services, &ts->nb_services, service);
 350     return service;
 351 }
 352
 353 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
 354 {
 355     AVFormatContext *ctx = s->opaque;
 356     put_buffer(ctx->pb, packet, TS_PACKET_SIZE);
 357 }
 358
 359 static int mpegts_write_header(AVFormatContext *s)
 360 {
 361     MpegTSWrite *ts = s->priv_data;
 362     MpegTSWriteStream *ts_st;
 363     MpegTSService *service;
 364     AVStream *st;
 365     int i, total_bit_rate;
 366     const char *service_name;
 367
 368     ts->tsid = DEFAULT_TSID;
 369     ts->onid = DEFAULT_ONID;
 370     /* allocate a single DVB service */
 371     service_name = s->title;
 372     if (service_name[0] == '\0')
 373         service_name = DEFAULT_SERVICE_NAME;
 374     service = mpegts_add_service(ts, DEFAULT_SID,
 375                                  DEFAULT_PROVIDER_NAME, service_name);
 376     service->pmt.write_packet = section_write_packet;
 377     service->pmt.opaque = s;
 378
 379     ts->pat.pid = PAT_PID;
 380     ts->pat.cc = 0;
 381     ts->pat.write_packet = section_write_packet;
 382     ts->pat.opaque = s;
 383
 384     ts->sdt.pid = SDT_PID;
 385     ts->sdt.cc = 0;
 386     ts->sdt.write_packet = section_write_packet;
 387     ts->sdt.opaque = s;
 388
 389     /* assign pids to each stream */
 390     total_bit_rate = 0;
 391     for(i = 0;i < s->nb_streams; i++) {
 392         st = s->streams[i];
 393         ts_st = av_mallocz(sizeof(MpegTSWriteStream));
 394         if (!ts_st)
 395             goto fail;
 396         st->priv_data = ts_st;
 397         ts_st->service = service;
 398         ts_st->pid = DEFAULT_START_PID + i;
 399         ts_st->payload_pts = AV_NOPTS_VALUE;
 400         ts_st->payload_dts = AV_NOPTS_VALUE;
 401         /* update PCR pid by using the first video stream */
 402         if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
 403             service->pcr_pid == 0x1fff)
 404             service->pcr_pid = ts_st->pid;
 405         total_bit_rate += st->codec->bit_rate;
 406     }
 407
 408     /* if no video stream, use the first stream as PCR */
 409     if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
 410         ts_st = s->streams[0]->priv_data;
 411         service->pcr_pid = ts_st->pid;
 412     }
 413
 414     if (total_bit_rate <= 8 * 1024)
 415         total_bit_rate = 8 * 1024;
 416     service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /
 417         (TS_PACKET_SIZE * 8 * 1000);
 418     ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /
 419         (TS_PACKET_SIZE * 8 * 1000);
 420     ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /
 421         (TS_PACKET_SIZE * 8 * 1000);
 422 #if 0
 423     printf("%d %d %d\n",
 424            total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
 425 #endif
 426
 427     /* write info at the start of the file, so that it will be fast to
 428        find them */
 429     mpegts_write_sdt(s);
 430     mpegts_write_pat(s);
 431     for(i = 0; i < ts->nb_services; i++) {
 432         mpegts_write_pmt(s, ts->services[i]);
 433     }
 434     put_flush_packet(s->pb);
 435
 436     return 0;
 437
 438  fail:
 439     for(i = 0;i < s->nb_streams; i++) {
 440         st = s->streams[i];
 441         av_free(st->priv_data);
 442     }
 443     return -1;
 444 }
 445
 446 /* send SDT, PAT and PMT tables regulary */
 447 static void retransmit_si_info(AVFormatContext *s)
 448 {
 449     MpegTSWrite *ts = s->priv_data;
 450     int i;
 451
 452     if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
 453         ts->sdt_packet_count = 0;
 454         mpegts_write_sdt(s);
 455     }
 456     if (++ts->pat_packet_count == ts->pat_packet_freq) {
 457         ts->pat_packet_count = 0;
 458         mpegts_write_pat(s);
 459         for(i = 0; i < ts->nb_services; i++) {
 460             mpegts_write_pmt(s, ts->services[i]);
 461         }
 462     }
 463 }
 464
 465 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
 466 {
 467     int val;
 468
 469     val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
 470     *q++ = val;
 471     val = (((pts >> 15) & 0x7fff) << 1) | 1;
 472     *q++ = val >> 8;
 473     *q++ = val;
 474     val = (((pts) & 0x7fff) << 1) | 1;
 475     *q++ = val >> 8;
 476     *q++ = val;
 477 }
 478
 479 /* NOTE: pes_data contains all the PES packet */
 480 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
 481                              const uint8_t *payload, int payload_size,
 482                              int64_t pts, int64_t dts)
 483 {
 484     MpegTSWriteStream *ts_st = st->priv_data;
 485     uint8_t buf[TS_PACKET_SIZE];
 486     uint8_t *q;
 487     int val, is_start, len, header_len, write_pcr, private_code, flags;
 488     int afc_len, stuffing_len;
 489     int64_t pcr = -1; /* avoid warning */
 490
 491     is_start = 1;
 492     while (payload_size > 0) {
 493         retransmit_si_info(s);
 494
 495         write_pcr = 0;
 496         if (ts_st->pid == ts_st->service->pcr_pid) {
 497             ts_st->service->pcr_packet_count++;
 498             if (ts_st->service->pcr_packet_count >=
 499                 ts_st->service->pcr_packet_freq) {
 500                 ts_st->service->pcr_packet_count = 0;
 501                 write_pcr = 1;
 502                 /* XXX: this is incorrect, but at least we have a PCR
 503                    value */
 504                 pcr = pts;
 505             }
 506         }
 507
 508         /* prepare packet header */
 509         q = buf;
 510         *q++ = 0x47;
 511         val = (ts_st->pid >> 8);
 512         if (is_start)
 513             val |= 0x40;
 514         *q++ = val;
 515         *q++ = ts_st->pid;
 516         *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
 517         ts_st->cc = (ts_st->cc + 1) & 0xf;
 518         if (write_pcr) {
 519             *q++ = 7; /* AFC length */
 520             *q++ = 0x10; /* flags: PCR present */
 521             *q++ = pcr >> 25;
 522             *q++ = pcr >> 17;
 523             *q++ = pcr >> 9;
 524             *q++ = pcr >> 1;
 525             *q++ = (pcr & 1) << 7;
 526             *q++ = 0;
 527         }
 528         if (is_start) {
 529             /* write PES header */
 530             *q++ = 0x00;
 531             *q++ = 0x00;
 532             *q++ = 0x01;
 533             private_code = 0;
 534             if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 535                 *q++ = 0xe0;
 536             } else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&
 537                        (st->codec->codec_id == CODEC_ID_MP2 ||
 538                         st->codec->codec_id == CODEC_ID_MP3)) {
 539                 *q++ = 0xc0;
 540             } else {
 541                 *q++ = 0xbd;
 542                 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
 543                     private_code = 0x20;
 544                 }
 545             }
 546             header_len = 0;
 547             flags = 0;
 548             if (pts != AV_NOPTS_VALUE) {
 549                 header_len += 5;
 550                 flags |= 0x80;
 551             }
 552             if (dts != AV_NOPTS_VALUE) {
 553                 header_len += 5;
 554                 flags |= 0x40;
 555             }
 556             len = payload_size + header_len + 3;
 557             if (private_code != 0)
 558                 len++;
 559             *q++ = len >> 8;
 560             *q++ = len;
 561             val = 0x80;
 562             /* data alignment indicator is required for subtitle data */
 563             if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
 564                 val |= 0x04;
 565             *q++ = val;
 566             *q++ = flags;
 567             *q++ = header_len;
 568             if (pts != AV_NOPTS_VALUE) {
 569                 write_pts(q, flags >> 6, pts);
 570                 q += 5;
 571             }
 572             if (dts != AV_NOPTS_VALUE) {
 573                 write_pts(q, 1, dts);
 574                 q += 5;
 575             }
 576             if (private_code != 0)
 577                 *q++ = private_code;
 578             is_start = 0;
 579         }
 580         /* header size */
 581         header_len = q - buf;
 582         /* data len */
 583         len = TS_PACKET_SIZE - header_len;
 584         if (len > payload_size)
 585             len = payload_size;
 586         stuffing_len = TS_PACKET_SIZE - header_len - len;
 587         if (stuffing_len > 0) {
 588             /* add stuffing with AFC */
 589             if (buf[3] & 0x20) {
 590                 /* stuffing already present: increase its size */
 591                 afc_len = buf[4] + 1;
 592                 memmove(buf + 4 + afc_len + stuffing_len,
 593                         buf + 4 + afc_len,
 594                         header_len - (4 + afc_len));
 595                 buf[4] += stuffing_len;
 596                 memset(buf + 4 + afc_len, 0xff, stuffing_len);
 597             } else {
 598                 /* add stuffing */
 599                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
 600                 buf[3] |= 0x20;
 601                 buf[4] = stuffing_len - 1;
 602                 if (stuffing_len >= 2) {
 603                     buf[5] = 0x00;
 604                     memset(buf + 6, 0xff, stuffing_len - 2);
 605                 }
 606             }
 607         }
 608         memcpy(buf + TS_PACKET_SIZE - len, payload, len);
 609         payload += len;
 610         payload_size -= len;
 611         put_buffer(s->pb, buf, TS_PACKET_SIZE);
 612     }
 613     put_flush_packet(s->pb);
 614 }
 615
 616 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
 617 {
 618     AVStream *st = s->streams[pkt->stream_index];
 619     int size= pkt->size;
 620     uint8_t *buf= pkt->data;
 621     MpegTSWriteStream *ts_st = st->priv_data;
 622     int len, max_payload_size;
 623
 624     if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
 625         /* for subtitle, a single PES packet must be generated */
 626         mpegts_write_pes(s, st, buf, size, pkt->pts, AV_NOPTS_VALUE);
 627         return 0;
 628     }
 629
 630     max_payload_size = DEFAULT_PES_PAYLOAD_SIZE;
 631     while (size > 0) {
 632         len = max_payload_size - ts_st->payload_index;
 633         if (len > size)
 634             len = size;
 635         memcpy(ts_st->payload + ts_st->payload_index, buf, len);
 636         buf += len;
 637         size -= len;
 638         ts_st->payload_index += len;
 639         if (ts_st->payload_pts == AV_NOPTS_VALUE)
 640             ts_st->payload_pts = pkt->pts;
 641         if (ts_st->payload_dts == AV_NOPTS_VALUE)
 642             ts_st->payload_dts = pkt->dts;
 643         if (ts_st->payload_index >= max_payload_size) {
 644             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
 645                              ts_st->payload_pts, ts_st->payload_dts);
 646             ts_st->payload_pts = AV_NOPTS_VALUE;
 647             ts_st->payload_dts = AV_NOPTS_VALUE;
 648             ts_st->payload_index = 0;
 649         }
 650     }
 651     return 0;
 652 }
 653
 654 static int mpegts_write_end(AVFormatContext *s)
 655 {
 656     MpegTSWrite *ts = s->priv_data;
 657     MpegTSWriteStream *ts_st;
 658     MpegTSService *service;
 659     AVStream *st;
 660     int i;
 661
 662     /* flush current packets */
 663     for(i = 0; i < s->nb_streams; i++) {
 664         st = s->streams[i];
 665         ts_st = st->priv_data;
 666         if (ts_st->payload_index > 0) {
 667             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
 668                              ts_st->payload_pts, ts_st->payload_dts);
 669         }
 670     }
 671     put_flush_packet(s->pb);
 672
 673     for(i = 0; i < ts->nb_services; i++) {
 674         service = ts->services[i];
 675         av_freep(&service->provider_name);
 676         av_freep(&service->name);
 677         av_free(service);
 678     }
 679     av_free(ts->services);
 680
 681     return 0;
 682 }
 683
 684 AVOutputFormat mpegts_muxer = {
 685     "mpegts",
 686     "MPEG2 transport stream format",
 687     "video/x-mpegts",
 688     "ts",
 689     sizeof(MpegTSWrite),
 690     CODEC_ID_MP2,
 691     CODEC_ID_MPEG2VIDEO,
 692     mpegts_write_header,
 693     mpegts_write_packet,
 694     mpegts_write_end,
 695 };