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     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
 147 } MpegTSWriteStream;
 148
 149 typedef struct MpegTSService {
 150     MpegTSSection pmt; /* MPEG2 pmt table context */
 151     int sid;           /* service ID */
 152     char *name;
 153     char *provider_name;
 154     int pcr_pid;
 155     int pcr_packet_count;
 156     int pcr_packet_freq;
 157 } MpegTSService;
 158
 159 typedef struct MpegTSWrite {
 160     MpegTSSection pat; /* MPEG2 pat table */
 161     MpegTSSection sdt; /* MPEG2 sdt table context */
 162     MpegTSService **services;
 163     int sdt_packet_count;
 164     int sdt_packet_freq;
 165     int pat_packet_count;
 166     int pat_packet_freq;
 167     int nb_services;
 168     int onid;
 169     int tsid;
 170 } MpegTSWrite;
 171
 172 static void mpegts_write_pat(AVFormatContext *s)
 173 {
 174     MpegTSWrite *ts = s->priv_data;
 175     MpegTSService *service;
 176     uint8_t data[1012], *q;
 177     int i;
 178
 179     q = data;
 180     for(i = 0; i < ts->nb_services; i++) {
 181         service = ts->services[i];
 182         put16(&q, service->sid);
 183         put16(&q, 0xe000 | service->pmt.pid);
 184     }
 185     mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
 186                           data, q - data);
 187 }
 188
 189 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
 190 {
 191     //    MpegTSWrite *ts = s->priv_data;
 192     uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
 193     int val, stream_type, i;
 194
 195     q = data;
 196     put16(&q, 0xe000 | service->pcr_pid);
 197
 198     program_info_length_ptr = q;
 199     q += 2; /* patched after */
 200
 201     /* put program info here */
 202
 203     val = 0xf000 | (q - program_info_length_ptr - 2);
 204     program_info_length_ptr[0] = val >> 8;
 205     program_info_length_ptr[1] = val;
 206
 207     for(i = 0; i < s->nb_streams; i++) {
 208         AVStream *st = s->streams[i];
 209         MpegTSWriteStream *ts_st = st->priv_data;
 210         switch(st->codec->codec_id) {
 211         case CODEC_ID_MPEG1VIDEO:
 212         case CODEC_ID_MPEG2VIDEO:
 213             stream_type = STREAM_TYPE_VIDEO_MPEG2;
 214             break;
 215         case CODEC_ID_MPEG4:
 216             stream_type = STREAM_TYPE_VIDEO_MPEG4;
 217             break;
 218         case CODEC_ID_H264:
 219             stream_type = STREAM_TYPE_VIDEO_H264;
 220             break;
 221         case CODEC_ID_MP2:
 222         case CODEC_ID_MP3:
 223             stream_type = STREAM_TYPE_AUDIO_MPEG1;
 224             break;
 225         case CODEC_ID_AAC:
 226             stream_type = STREAM_TYPE_AUDIO_AAC;
 227             break;
 228         case CODEC_ID_AC3:
 229             stream_type = STREAM_TYPE_AUDIO_AC3;
 230             break;
 231         default:
 232             stream_type = STREAM_TYPE_PRIVATE_DATA;
 233             break;
 234         }
 235         *q++ = stream_type;
 236         put16(&q, 0xe000 | ts_st->pid);
 237         desc_length_ptr = q;
 238         q += 2; /* patched after */
 239
 240         /* write optional descriptors here */
 241         switch(st->codec->codec_type) {
 242         case CODEC_TYPE_AUDIO:
 243             if (strlen(st->language) == 3) {
 244                 *q++ = 0x0a; /* ISO 639 language descriptor */
 245                 *q++ = 4;
 246                 *q++ = st->language[0];
 247                 *q++ = st->language[1];
 248                 *q++ = st->language[2];
 249                 *q++ = 0; /* undefined type */
 250             }
 251             break;
 252         case CODEC_TYPE_SUBTITLE:
 253             {
 254                 const char *language;
 255                 language = st->language;
 256                 if (strlen(language) != 3)
 257                     language = "eng";
 258                 *q++ = 0x59;
 259                 *q++ = 8;
 260                 *q++ = language[0];
 261                 *q++ = language[1];
 262                 *q++ = language[2];
 263                 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
 264                 put16(&q, 1); /* page id */
 265                 put16(&q, 1); /* ancillary page id */
 266             }
 267             break;
 268         }
 269
 270         val = 0xf000 | (q - desc_length_ptr - 2);
 271         desc_length_ptr[0] = val >> 8;
 272         desc_length_ptr[1] = val;
 273     }
 274     mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
 275                           data, q - data);
 276 }
 277
 278 /* NOTE: str == NULL is accepted for an empty string */
 279 static void putstr8(uint8_t **q_ptr, const char *str)
 280 {
 281     uint8_t *q;
 282     int len;
 283
 284     q = *q_ptr;
 285     if (!str)
 286         len = 0;
 287     else
 288         len = strlen(str);
 289     *q++ = len;
 290     memcpy(q, str, len);
 291     q += len;
 292     *q_ptr = q;
 293 }
 294
 295 static void mpegts_write_sdt(AVFormatContext *s)
 296 {
 297     MpegTSWrite *ts = s->priv_data;
 298     MpegTSService *service;
 299     uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
 300     int i, running_status, free_ca_mode, val;
 301
 302     q = data;
 303     put16(&q, ts->onid);
 304     *q++ = 0xff;
 305     for(i = 0; i < ts->nb_services; i++) {
 306         service = ts->services[i];
 307         put16(&q, service->sid);
 308         *q++ = 0xfc | 0x00; /* currently no EIT info */
 309         desc_list_len_ptr = q;
 310         q += 2;
 311         running_status = 4; /* running */
 312         free_ca_mode = 0;
 313
 314         /* write only one descriptor for the service name and provider */
 315         *q++ = 0x48;
 316         desc_len_ptr = q;
 317         q++;
 318         *q++ = 0x01; /* digital television service */
 319         putstr8(&q, service->provider_name);
 320         putstr8(&q, service->name);
 321         desc_len_ptr[0] = q - desc_len_ptr - 1;
 322
 323         /* fill descriptor length */
 324         val = (running_status << 13) | (free_ca_mode << 12) |
 325             (q - desc_list_len_ptr - 2);
 326         desc_list_len_ptr[0] = val >> 8;
 327         desc_list_len_ptr[1] = val;
 328     }
 329     mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
 330                           data, q - data);
 331 }
 332
 333 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
 334                                          int sid,
 335                                          const char *provider_name,
 336                                          const char *name)
 337 {
 338     MpegTSService *service;
 339
 340     service = av_mallocz(sizeof(MpegTSService));
 341     if (!service)
 342         return NULL;
 343     service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
 344     service->sid = sid;
 345     service->provider_name = av_strdup(provider_name);
 346     service->name = av_strdup(name);
 347     service->pcr_pid = 0x1fff;
 348     dynarray_add(&ts->services, &ts->nb_services, service);
 349     return service;
 350 }
 351
 352 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
 353 {
 354     AVFormatContext *ctx = s->opaque;
 355     put_buffer(&ctx->pb, packet, TS_PACKET_SIZE);
 356 }
 357
 358 static int mpegts_write_header(AVFormatContext *s)
 359 {
 360     MpegTSWrite *ts = s->priv_data;
 361     MpegTSWriteStream *ts_st;
 362     MpegTSService *service;
 363     AVStream *st;
 364     int i, total_bit_rate;
 365     const char *service_name;
 366
 367     ts->tsid = DEFAULT_TSID;
 368     ts->onid = DEFAULT_ONID;
 369     /* allocate a single DVB service */
 370     service_name = s->title;
 371     if (service_name[0] == '\0')
 372         service_name = DEFAULT_SERVICE_NAME;
 373     service = mpegts_add_service(ts, DEFAULT_SID,
 374                                  DEFAULT_PROVIDER_NAME, service_name);
 375     service->pmt.write_packet = section_write_packet;
 376     service->pmt.opaque = s;
 377
 378     ts->pat.pid = PAT_PID;
 379     ts->pat.cc = 0;
 380     ts->pat.write_packet = section_write_packet;
 381     ts->pat.opaque = s;
 382
 383     ts->sdt.pid = SDT_PID;
 384     ts->sdt.cc = 0;
 385     ts->sdt.write_packet = section_write_packet;
 386     ts->sdt.opaque = s;
 387
 388     /* assign pids to each stream */
 389     total_bit_rate = 0;
 390     for(i = 0;i < s->nb_streams; i++) {
 391         st = s->streams[i];
 392         ts_st = av_mallocz(sizeof(MpegTSWriteStream));
 393         if (!ts_st)
 394             goto fail;
 395         st->priv_data = ts_st;
 396         ts_st->service = service;
 397         ts_st->pid = DEFAULT_START_PID + i;
 398         ts_st->payload_pts = AV_NOPTS_VALUE;
 399         /* update PCR pid by using the first video stream */
 400         if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
 401             service->pcr_pid == 0x1fff)
 402             service->pcr_pid = ts_st->pid;
 403         total_bit_rate += st->codec->bit_rate;
 404     }
 405
 406     /* if no video stream, use the first stream as PCR */
 407     if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
 408         ts_st = s->streams[0]->priv_data;
 409         service->pcr_pid = ts_st->pid;
 410     }
 411
 412     if (total_bit_rate <= 8 * 1024)
 413         total_bit_rate = 8 * 1024;
 414     service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /
 415         (TS_PACKET_SIZE * 8 * 1000);
 416     ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /
 417         (TS_PACKET_SIZE * 8 * 1000);
 418     ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /
 419         (TS_PACKET_SIZE * 8 * 1000);
 420 #if 0
 421     printf("%d %d %d\n",
 422            total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
 423 #endif
 424
 425     /* write info at the start of the file, so that it will be fast to
 426        find them */
 427     mpegts_write_sdt(s);
 428     mpegts_write_pat(s);
 429     for(i = 0; i < ts->nb_services; i++) {
 430         mpegts_write_pmt(s, ts->services[i]);
 431     }
 432     put_flush_packet(&s->pb);
 433
 434     return 0;
 435
 436  fail:
 437     for(i = 0;i < s->nb_streams; i++) {
 438         st = s->streams[i];
 439         av_free(st->priv_data);
 440     }
 441     return -1;
 442 }
 443
 444 /* send SDT, PAT and PMT tables regulary */
 445 static void retransmit_si_info(AVFormatContext *s)
 446 {
 447     MpegTSWrite *ts = s->priv_data;
 448     int i;
 449
 450     if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
 451         ts->sdt_packet_count = 0;
 452         mpegts_write_sdt(s);
 453     }
 454     if (++ts->pat_packet_count == ts->pat_packet_freq) {
 455         ts->pat_packet_count = 0;
 456         mpegts_write_pat(s);
 457         for(i = 0; i < ts->nb_services; i++) {
 458             mpegts_write_pmt(s, ts->services[i]);
 459         }
 460     }
 461 }
 462
 463 /* NOTE: pes_data contains all the PES packet */
 464 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
 465                              const uint8_t *payload, int payload_size,
 466                              int64_t pts)
 467 {
 468     MpegTSWriteStream *ts_st = st->priv_data;
 469     uint8_t buf[TS_PACKET_SIZE];
 470     uint8_t *q;
 471     int val, is_start, len, header_len, write_pcr, private_code;
 472     int afc_len, stuffing_len;
 473     int64_t pcr = -1; /* avoid warning */
 474
 475     is_start = 1;
 476     while (payload_size > 0) {
 477         retransmit_si_info(s);
 478
 479         write_pcr = 0;
 480         if (ts_st->pid == ts_st->service->pcr_pid) {
 481             ts_st->service->pcr_packet_count++;
 482             if (ts_st->service->pcr_packet_count >=
 483                 ts_st->service->pcr_packet_freq) {
 484                 ts_st->service->pcr_packet_count = 0;
 485                 write_pcr = 1;
 486                 /* XXX: this is incorrect, but at least we have a PCR
 487                    value */
 488                 pcr = pts;
 489             }
 490         }
 491
 492         /* prepare packet header */
 493         q = buf;
 494         *q++ = 0x47;
 495         val = (ts_st->pid >> 8);
 496         if (is_start)
 497             val |= 0x40;
 498         *q++ = val;
 499         *q++ = ts_st->pid;
 500         *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
 501         ts_st->cc = (ts_st->cc + 1) & 0xf;
 502         if (write_pcr) {
 503             *q++ = 7; /* AFC length */
 504             *q++ = 0x10; /* flags: PCR present */
 505             *q++ = pcr >> 25;
 506             *q++ = pcr >> 17;
 507             *q++ = pcr >> 9;
 508             *q++ = pcr >> 1;
 509             *q++ = (pcr & 1) << 7;
 510             *q++ = 0;
 511         }
 512         if (is_start) {
 513             /* write PES header */
 514             *q++ = 0x00;
 515             *q++ = 0x00;
 516             *q++ = 0x01;
 517             private_code = 0;
 518             if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 519                 *q++ = 0xe0;
 520             } else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&
 521                        (st->codec->codec_id == CODEC_ID_MP2 ||
 522                         st->codec->codec_id == CODEC_ID_MP3)) {
 523                 *q++ = 0xc0;
 524             } else {
 525                 *q++ = 0xbd;
 526                 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
 527                     private_code = 0x20;
 528                 }
 529             }
 530             if (pts != AV_NOPTS_VALUE)
 531                 header_len = 8;
 532             else
 533                 header_len = 3;
 534             if (private_code != 0)
 535                 header_len++;
 536             len = payload_size + header_len;
 537             *q++ = len >> 8;
 538             *q++ = len;
 539             val = 0x80;
 540             /* data alignment indicator is required for subtitle data */
 541             if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
 542                 val |= 0x04;
 543             *q++ = val;
 544             if (pts != AV_NOPTS_VALUE) {
 545                 *q++ = 0x80; /* PTS only */
 546                 *q++ = 0x05; /* header len */
 547                 val = (0x02 << 4) |
 548                     (((pts >> 30) & 0x07) << 1) | 1;
 549                 *q++ = val;
 550                 val = (((pts >> 15) & 0x7fff) << 1) | 1;
 551                 *q++ = val >> 8;
 552                 *q++ = val;
 553                 val = (((pts) & 0x7fff) << 1) | 1;
 554                 *q++ = val >> 8;
 555                 *q++ = val;
 556             } else {
 557                 *q++ = 0x00;
 558                 *q++ = 0x00;
 559             }
 560             if (private_code != 0)
 561                 *q++ = private_code;
 562             is_start = 0;
 563         }
 564         /* header size */
 565         header_len = q - buf;
 566         /* data len */
 567         len = TS_PACKET_SIZE - header_len;
 568         if (len > payload_size)
 569             len = payload_size;
 570         stuffing_len = TS_PACKET_SIZE - header_len - len;
 571         if (stuffing_len > 0) {
 572             /* add stuffing with AFC */
 573             if (buf[3] & 0x20) {
 574                 /* stuffing already present: increase its size */
 575                 afc_len = buf[4] + 1;
 576                 memmove(buf + 4 + afc_len + stuffing_len,
 577                         buf + 4 + afc_len,
 578                         header_len - (4 + afc_len));
 579                 buf[4] += stuffing_len;
 580                 memset(buf + 4 + afc_len, 0xff, stuffing_len);
 581             } else {
 582                 /* add stuffing */
 583                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
 584                 buf[3] |= 0x20;
 585                 buf[4] = stuffing_len - 1;
 586                 if (stuffing_len >= 2) {
 587                     buf[5] = 0x00;
 588                     memset(buf + 6, 0xff, stuffing_len - 2);
 589                 }
 590             }
 591         }
 592         memcpy(buf + TS_PACKET_SIZE - len, payload, len);
 593         payload += len;
 594         payload_size -= len;
 595         put_buffer(&s->pb, buf, TS_PACKET_SIZE);
 596     }
 597     put_flush_packet(&s->pb);
 598 }
 599
 600 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
 601 {
 602     AVStream *st = s->streams[pkt->stream_index];
 603     int size= pkt->size;
 604     uint8_t *buf= pkt->data;
 605     MpegTSWriteStream *ts_st = st->priv_data;
 606     int len, max_payload_size;
 607
 608     if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
 609         /* for subtitle, a single PES packet must be generated */
 610         mpegts_write_pes(s, st, buf, size, pkt->pts);
 611         return 0;
 612     }
 613
 614     max_payload_size = DEFAULT_PES_PAYLOAD_SIZE;
 615     while (size > 0) {
 616         len = max_payload_size - ts_st->payload_index;
 617         if (len > size)
 618             len = size;
 619         memcpy(ts_st->payload + ts_st->payload_index, buf, len);
 620         buf += len;
 621         size -= len;
 622         ts_st->payload_index += len;
 623         if (ts_st->payload_pts == AV_NOPTS_VALUE)
 624             ts_st->payload_pts = pkt->pts;
 625         if (ts_st->payload_index >= max_payload_size) {
 626             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
 627                              ts_st->payload_pts);
 628             ts_st->payload_pts = AV_NOPTS_VALUE;
 629             ts_st->payload_index = 0;
 630         }
 631     }
 632     return 0;
 633 }
 634
 635 static int mpegts_write_end(AVFormatContext *s)
 636 {
 637     MpegTSWrite *ts = s->priv_data;
 638     MpegTSWriteStream *ts_st;
 639     MpegTSService *service;
 640     AVStream *st;
 641     int i;
 642
 643     /* flush current packets */
 644     for(i = 0; i < s->nb_streams; i++) {
 645         st = s->streams[i];
 646         ts_st = st->priv_data;
 647         if (ts_st->payload_index > 0) {
 648             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
 649                              ts_st->payload_pts);
 650         }
 651     }
 652     put_flush_packet(&s->pb);
 653
 654     for(i = 0; i < ts->nb_services; i++) {
 655         service = ts->services[i];
 656         av_freep(&service->provider_name);
 657         av_freep(&service->name);
 658         av_free(service);
 659     }
 660     av_free(ts->services);
 661
 662     return 0;
 663 }
 664
 665 AVOutputFormat mpegts_muxer = {
 666     "mpegts",
 667     "MPEG2 transport stream format",
 668     "video/x-mpegts",
 669     "ts",
 670     sizeof(MpegTSWrite),
 671     CODEC_ID_MP2,
 672     CODEC_ID_MPEG2VIDEO,
 673     mpegts_write_header,
 674     mpegts_write_packet,
 675     mpegts_write_end,
 676 };