libavformat/mpegtsenc.c

   1 /*
   2  * MPEG2 transport stream (aka DVB) mux
   3  * Copyright (c) 2003 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19 #include "avformat.h"
  20
  21 #include "mpegts.h"
  22
  23 /* write DVB SI sections */
  24
  25 static const uint32_t crc_table[256] = {
  26         0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
  27         0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
  28         0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
  29         0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
  30         0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
  31         0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
  32         0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
  33         0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
  34         0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
  35         0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
  36         0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
  37         0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
  38         0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
  39         0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
  40         0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
  41         0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
  42         0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
  43         0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
  44         0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
  45         0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
  46         0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
  47         0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
  48         0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
  49         0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
  50         0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
  51         0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
  52         0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
  53         0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
  54         0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
  55         0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
  56         0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
  57         0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
  58         0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
  59         0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
  60         0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
  61         0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
  62         0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
  63         0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
  64         0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
  65         0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
  66         0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
  67         0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
  68         0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
  69 };
  70
  71 unsigned int mpegts_crc32(const uint8_t *data, int len)
  72 {
  73     register int i;
  74     unsigned int crc = 0xffffffff;
  75
  76     for (i=0; i<len; i++)
  77         crc = (crc << 8) ^ crc_table[((crc >> 24) ^ *data++) & 0xff];
  78
  79     return crc;
  80 }
  81
  82 #ifdef CONFIG_MUXERS
  83 /*********************************************/
  84 /* mpegts section writer */
  85
  86 typedef struct MpegTSSection {
  87     int pid;
  88     int cc;
  89     void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
  90     void *opaque;
  91 } MpegTSSection;
  92
  93 /* NOTE: 4 bytes must be left at the end for the crc32 */
  94 void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
  95 {
  96     unsigned int crc;
  97     unsigned char packet[TS_PACKET_SIZE];
  98     const unsigned char *buf_ptr;
  99     unsigned char *q;
 100     int first, b, len1, left;
 101
 102     crc = mpegts_crc32(buf, len - 4);
 103     buf[len - 4] = (crc >> 24) & 0xff;
 104     buf[len - 3] = (crc >> 16) & 0xff;
 105     buf[len - 2] = (crc >> 8) & 0xff;
 106     buf[len - 1] = (crc) & 0xff;
 107
 108     /* send each packet */
 109     buf_ptr = buf;
 110     while (len > 0) {
 111         first = (buf == buf_ptr);
 112         q = packet;
 113         *q++ = 0x47;
 114         b = (s->pid >> 8);
 115         if (first)
 116             b |= 0x40;
 117         *q++ = b;
 118         *q++ = s->pid;
 119         s->cc = (s->cc + 1) & 0xf;
 120         *q++ = 0x10 | s->cc;
 121         if (first)
 122             *q++ = 0; /* 0 offset */
 123         len1 = TS_PACKET_SIZE - (q - packet);
 124         if (len1 > len)
 125             len1 = len;
 126         memcpy(q, buf_ptr, len1);
 127         q += len1;
 128         /* add known padding data */
 129         left = TS_PACKET_SIZE - (q - packet);
 130         if (left > 0)
 131             memset(q, 0xff, left);
 132
 133         s->write_packet(s, packet);
 134
 135         buf_ptr += len1;
 136         len -= len1;
 137     }
 138 }
 139
 140 static inline void put16(uint8_t **q_ptr, int val)
 141 {
 142     uint8_t *q;
 143     q = *q_ptr;
 144     *q++ = val >> 8;
 145     *q++ = val;
 146     *q_ptr = q;
 147 }
 148
 149 int mpegts_write_section1(MpegTSSection *s, int tid, int id,
 150                           int version, int sec_num, int last_sec_num,
 151                           uint8_t *buf, int len)
 152 {
 153     uint8_t section[1024], *q;
 154     unsigned int tot_len;
 155
 156     tot_len = 3 + 5 + len + 4;
 157     /* check if not too big */
 158     if (tot_len > 1024)
 159         return -1;
 160
 161     q = section;
 162     *q++ = tid;
 163     put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
 164     put16(&q, id);
 165     *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
 166     *q++ = sec_num;
 167     *q++ = last_sec_num;
 168     memcpy(q, buf, len);
 169
 170     mpegts_write_section(s, section, tot_len);
 171     return 0;
 172 }
 173
 174 /*********************************************/
 175 /* mpegts writer */
 176
 177 #define DEFAULT_PMT_START_PID   0x1000
 178 #define DEFAULT_START_PID       0x0100
 179 #define DEFAULT_PROVIDER_NAME   "FFmpeg"
 180 #define DEFAULT_SERVICE_NAME    "Service01"
 181
 182 /* default network id, transport stream and service identifiers */
 183 #define DEFAULT_ONID            0x0001
 184 #define DEFAULT_TSID            0x0001
 185 #define DEFAULT_SID             0x0001
 186
 187 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
 188 #define DEFAULT_PES_HEADER_FREQ 16
 189 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
 190
 191 /* we retransmit the SI info at this rate */
 192 #define SDT_RETRANS_TIME 500
 193 #define PAT_RETRANS_TIME 100
 194 #define PCR_RETRANS_TIME 20
 195
 196 typedef struct MpegTSWriteStream {
 197     struct MpegTSService *service;
 198     int pid; /* stream associated pid */
 199     int cc;
 200     int payload_index;
 201     int64_t payload_pts;
 202     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
 203 } MpegTSWriteStream;
 204
 205 typedef struct MpegTSService {
 206     MpegTSSection pmt; /* MPEG2 pmt table context */
 207     int sid;           /* service ID */
 208     char *name;
 209     char *provider_name;
 210     int pcr_pid;
 211     int pcr_packet_count;
 212     int pcr_packet_freq;
 213 } MpegTSService;
 214
 215 typedef struct MpegTSWrite {
 216     MpegTSSection pat; /* MPEG2 pat table */
 217     MpegTSSection sdt; /* MPEG2 sdt table context */
 218     MpegTSService **services;
 219     int sdt_packet_count;
 220     int sdt_packet_freq;
 221     int pat_packet_count;
 222     int pat_packet_freq;
 223     int nb_services;
 224     int onid;
 225     int tsid;
 226 } MpegTSWrite;
 227
 228 static void mpegts_write_pat(AVFormatContext *s)
 229 {
 230     MpegTSWrite *ts = s->priv_data;
 231     MpegTSService *service;
 232     uint8_t data[1012], *q;
 233     int i;
 234
 235     q = data;
 236     for(i = 0; i < ts->nb_services; i++) {
 237         service = ts->services[i];
 238         put16(&q, service->sid);
 239         put16(&q, 0xe000 | service->pmt.pid);
 240     }
 241     mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
 242                           data, q - data);
 243 }
 244
 245 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
 246 {
 247     //    MpegTSWrite *ts = s->priv_data;
 248     uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
 249     int val, stream_type, i;
 250
 251     q = data;
 252     put16(&q, 0xe000 | service->pcr_pid);
 253
 254     program_info_length_ptr = q;
 255     q += 2; /* patched after */
 256
 257     /* put program info here */
 258
 259     val = 0xf000 | (q - program_info_length_ptr - 2);
 260     program_info_length_ptr[0] = val >> 8;
 261     program_info_length_ptr[1] = val;
 262
 263     for(i = 0; i < s->nb_streams; i++) {
 264         AVStream *st = s->streams[i];
 265         MpegTSWriteStream *ts_st = st->priv_data;
 266         switch(st->codec->codec_id) {
 267         case CODEC_ID_MPEG1VIDEO:
 268         case CODEC_ID_MPEG2VIDEO:
 269             stream_type = STREAM_TYPE_VIDEO_MPEG2;
 270             break;
 271         case CODEC_ID_MPEG4:
 272             stream_type = STREAM_TYPE_VIDEO_MPEG4;
 273             break;
 274         case CODEC_ID_H264:
 275             stream_type = STREAM_TYPE_VIDEO_H264;
 276             break;
 277         case CODEC_ID_MP2:
 278         case CODEC_ID_MP3:
 279             stream_type = STREAM_TYPE_AUDIO_MPEG1;
 280             break;
 281         case CODEC_ID_AAC:
 282             stream_type = STREAM_TYPE_AUDIO_AAC;
 283             break;
 284         case CODEC_ID_AC3:
 285             stream_type = STREAM_TYPE_AUDIO_AC3;
 286             break;
 287         default:
 288             stream_type = STREAM_TYPE_PRIVATE_DATA;
 289             break;
 290         }
 291         *q++ = stream_type;
 292         put16(&q, 0xe000 | ts_st->pid);
 293         desc_length_ptr = q;
 294         q += 2; /* patched after */
 295
 296         /* write optional descriptors here */
 297         switch(st->codec->codec_type) {
 298         case CODEC_TYPE_AUDIO:
 299             if (strlen(st->language) == 3) {
 300                 *q++ = 0x0a; /* ISO 639 language descriptor */
 301                 *q++ = 4;
 302                 *q++ = st->language[0];
 303                 *q++ = st->language[1];
 304                 *q++ = st->language[2];
 305                 *q++ = 0; /* undefined type */
 306             }
 307             break;
 308         case CODEC_TYPE_SUBTITLE:
 309             {
 310                 const char *language;
 311                 language = st->language;
 312                 if (strlen(language) != 3)
 313                     language = "eng";
 314                 *q++ = 0x59;
 315                 *q++ = 8;
 316                 *q++ = language[0];
 317                 *q++ = language[1];
 318                 *q++ = language[2];
 319                 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
 320                 put16(&q, 1); /* page id */
 321                 put16(&q, 1); /* ancillary page id */
 322             }
 323             break;
 324         }
 325
 326         val = 0xf000 | (q - desc_length_ptr - 2);
 327         desc_length_ptr[0] = val >> 8;
 328         desc_length_ptr[1] = val;
 329     }
 330     mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
 331                           data, q - data);
 332 }
 333
 334 /* NOTE: str == NULL is accepted for an empty string */
 335 static void putstr8(uint8_t **q_ptr, const char *str)
 336 {
 337     uint8_t *q;
 338     int len;
 339
 340     q = *q_ptr;
 341     if (!str)
 342         len = 0;
 343     else
 344         len = strlen(str);
 345     *q++ = len;
 346     memcpy(q, str, len);
 347     q += len;
 348     *q_ptr = q;
 349 }
 350
 351 static void mpegts_write_sdt(AVFormatContext *s)
 352 {
 353     MpegTSWrite *ts = s->priv_data;
 354     MpegTSService *service;
 355     uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
 356     int i, running_status, free_ca_mode, val;
 357
 358     q = data;
 359     put16(&q, ts->onid);
 360     *q++ = 0xff;
 361     for(i = 0; i < ts->nb_services; i++) {
 362         service = ts->services[i];
 363         put16(&q, service->sid);
 364         *q++ = 0xfc | 0x00; /* currently no EIT info */
 365         desc_list_len_ptr = q;
 366         q += 2;
 367         running_status = 4; /* running */
 368         free_ca_mode = 0;
 369
 370         /* write only one descriptor for the service name and provider */
 371         *q++ = 0x48;
 372         desc_len_ptr = q;
 373         q++;
 374         *q++ = 0x01; /* digital television service */
 375         putstr8(&q, service->provider_name);
 376         putstr8(&q, service->name);
 377         desc_len_ptr[0] = q - desc_len_ptr - 1;
 378
 379         /* fill descriptor length */
 380         val = (running_status << 13) | (free_ca_mode << 12) |
 381             (q - desc_list_len_ptr - 2);
 382         desc_list_len_ptr[0] = val >> 8;
 383         desc_list_len_ptr[1] = val;
 384     }
 385     mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
 386                           data, q - data);
 387 }
 388
 389 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
 390                                          int sid,
 391                                          const char *provider_name,
 392                                          const char *name)
 393 {
 394     MpegTSService *service;
 395
 396     service = av_mallocz(sizeof(MpegTSService));
 397     if (!service)
 398         return NULL;
 399     service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
 400     service->sid = sid;
 401     service->provider_name = av_strdup(provider_name);
 402     service->name = av_strdup(name);
 403     service->pcr_pid = 0x1fff;
 404     dynarray_add(&ts->services, &ts->nb_services, service);
 405     return service;
 406 }
 407
 408 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
 409 {
 410     AVFormatContext *ctx = s->opaque;
 411     put_buffer(&ctx->pb, packet, TS_PACKET_SIZE);
 412 }
 413
 414 static int mpegts_write_header(AVFormatContext *s)
 415 {
 416     MpegTSWrite *ts = s->priv_data;
 417     MpegTSWriteStream *ts_st;
 418     MpegTSService *service;
 419     AVStream *st;
 420     int i, total_bit_rate;
 421     const char *service_name;
 422
 423     ts->tsid = DEFAULT_TSID;
 424     ts->onid = DEFAULT_ONID;
 425     /* allocate a single DVB service */
 426     service_name = s->title;
 427     if (service_name[0] == '\0')
 428         service_name = DEFAULT_SERVICE_NAME;
 429     service = mpegts_add_service(ts, DEFAULT_SID,
 430                                  DEFAULT_PROVIDER_NAME, service_name);
 431     service->pmt.write_packet = section_write_packet;
 432     service->pmt.opaque = s;
 433
 434     ts->pat.pid = PAT_PID;
 435     ts->pat.cc = 0;
 436     ts->pat.write_packet = section_write_packet;
 437     ts->pat.opaque = s;
 438
 439     ts->sdt.pid = SDT_PID;
 440     ts->sdt.cc = 0;
 441     ts->sdt.write_packet = section_write_packet;
 442     ts->sdt.opaque = s;
 443
 444     /* assign pids to each stream */
 445     total_bit_rate = 0;
 446     for(i = 0;i < s->nb_streams; i++) {
 447         st = s->streams[i];
 448         ts_st = av_mallocz(sizeof(MpegTSWriteStream));
 449         if (!ts_st)
 450             goto fail;
 451         st->priv_data = ts_st;
 452         ts_st->service = service;
 453         ts_st->pid = DEFAULT_START_PID + i;
 454         ts_st->payload_pts = AV_NOPTS_VALUE;
 455         /* update PCR pid by using the first video stream */
 456         if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
 457             service->pcr_pid == 0x1fff)
 458             service->pcr_pid = ts_st->pid;
 459         total_bit_rate += st->codec->bit_rate;
 460     }
 461
 462     /* if no video stream, use the first stream as PCR */
 463     if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
 464         ts_st = s->streams[0]->priv_data;
 465         service->pcr_pid = ts_st->pid;
 466     }
 467
 468     if (total_bit_rate <= 8 * 1024)
 469         total_bit_rate = 8 * 1024;
 470     service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /
 471         (TS_PACKET_SIZE * 8 * 1000);
 472     ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /
 473         (TS_PACKET_SIZE * 8 * 1000);
 474     ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /
 475         (TS_PACKET_SIZE * 8 * 1000);
 476 #if 0
 477     printf("%d %d %d\n",
 478            total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
 479 #endif
 480
 481     /* write info at the start of the file, so that it will be fast to
 482        find them */
 483     mpegts_write_sdt(s);
 484     mpegts_write_pat(s);
 485     for(i = 0; i < ts->nb_services; i++) {
 486         mpegts_write_pmt(s, ts->services[i]);
 487     }
 488     put_flush_packet(&s->pb);
 489
 490     return 0;
 491
 492  fail:
 493     for(i = 0;i < s->nb_streams; i++) {
 494         st = s->streams[i];
 495         av_free(st->priv_data);
 496     }
 497     return -1;
 498 }
 499
 500 /* send SDT, PAT and PMT tables regulary */
 501 static void retransmit_si_info(AVFormatContext *s)
 502 {
 503     MpegTSWrite *ts = s->priv_data;
 504     int i;
 505
 506     if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
 507         ts->sdt_packet_count = 0;
 508         mpegts_write_sdt(s);
 509     }
 510     if (++ts->pat_packet_count == ts->pat_packet_freq) {
 511         ts->pat_packet_count = 0;
 512         mpegts_write_pat(s);
 513         for(i = 0; i < ts->nb_services; i++) {
 514             mpegts_write_pmt(s, ts->services[i]);
 515         }
 516     }
 517 }
 518
 519 /* NOTE: pes_data contains all the PES packet */
 520 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
 521                              const uint8_t *payload, int payload_size,
 522                              int64_t pts)
 523 {
 524     MpegTSWriteStream *ts_st = st->priv_data;
 525     uint8_t buf[TS_PACKET_SIZE];
 526     uint8_t *q;
 527     int val, is_start, len, header_len, write_pcr, private_code;
 528     int afc_len, stuffing_len;
 529     int64_t pcr = -1; /* avoid warning */
 530
 531     is_start = 1;
 532     while (payload_size > 0) {
 533         retransmit_si_info(s);
 534
 535         write_pcr = 0;
 536         if (ts_st->pid == ts_st->service->pcr_pid) {
 537             ts_st->service->pcr_packet_count++;
 538             if (ts_st->service->pcr_packet_count >=
 539                 ts_st->service->pcr_packet_freq) {
 540                 ts_st->service->pcr_packet_count = 0;
 541                 write_pcr = 1;
 542                 /* XXX: this is incorrect, but at least we have a PCR
 543                    value */
 544                 pcr = pts;
 545             }
 546         }
 547
 548         /* prepare packet header */
 549         q = buf;
 550         *q++ = 0x47;
 551         val = (ts_st->pid >> 8);
 552         if (is_start)
 553             val |= 0x40;
 554         *q++ = val;
 555         *q++ = ts_st->pid;
 556         *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
 557         ts_st->cc = (ts_st->cc + 1) & 0xf;
 558         if (write_pcr) {
 559             *q++ = 7; /* AFC length */
 560             *q++ = 0x10; /* flags: PCR present */
 561             *q++ = pcr >> 25;
 562             *q++ = pcr >> 17;
 563             *q++ = pcr >> 9;
 564             *q++ = pcr >> 1;
 565             *q++ = (pcr & 1) << 7;
 566             *q++ = 0;
 567         }
 568         if (is_start) {
 569             /* write PES header */
 570             *q++ = 0x00;
 571             *q++ = 0x00;
 572             *q++ = 0x01;
 573             private_code = 0;
 574             if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 575                 *q++ = 0xe0;
 576             } else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&
 577                        (st->codec->codec_id == CODEC_ID_MP2 ||
 578                         st->codec->codec_id == CODEC_ID_MP3)) {
 579                 *q++ = 0xc0;
 580             } else {
 581                 *q++ = 0xbd;
 582                 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
 583                     private_code = 0x20;
 584                 }
 585             }
 586             if (pts != AV_NOPTS_VALUE)
 587                 header_len = 8;
 588             else
 589                 header_len = 3;
 590             if (private_code != 0)
 591                 header_len++;
 592             len = payload_size + header_len;
 593             *q++ = len >> 8;
 594             *q++ = len;
 595             val = 0x80;
 596             /* data alignment indicator is required for subtitle data */
 597             if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
 598                 val |= 0x04;
 599             *q++ = val;
 600             if (pts != AV_NOPTS_VALUE) {
 601                 *q++ = 0x80; /* PTS only */
 602                 *q++ = 0x05; /* header len */
 603                 val = (0x02 << 4) |
 604                     (((pts >> 30) & 0x07) << 1) | 1;
 605                 *q++ = val;
 606                 val = (((pts >> 15) & 0x7fff) << 1) | 1;
 607                 *q++ = val >> 8;
 608                 *q++ = val;
 609                 val = (((pts) & 0x7fff) << 1) | 1;
 610                 *q++ = val >> 8;
 611                 *q++ = val;
 612             } else {
 613                 *q++ = 0x00;
 614                 *q++ = 0x00;
 615             }
 616             if (private_code != 0)
 617                 *q++ = private_code;
 618             is_start = 0;
 619         }
 620         /* header size */
 621         header_len = q - buf;
 622         /* data len */
 623         len = TS_PACKET_SIZE - header_len;
 624         if (len > payload_size)
 625             len = payload_size;
 626         stuffing_len = TS_PACKET_SIZE - header_len - len;
 627         if (stuffing_len > 0) {
 628             /* add stuffing with AFC */
 629             if (buf[3] & 0x20) {
 630                 /* stuffing already present: increase its size */
 631                 afc_len = buf[4] + 1;
 632                 memmove(buf + 4 + afc_len + stuffing_len,
 633                         buf + 4 + afc_len,
 634                         header_len - (4 + afc_len));
 635                 buf[4] += stuffing_len;
 636                 memset(buf + 4 + afc_len, 0xff, stuffing_len);
 637             } else {
 638                 /* add stuffing */
 639                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
 640                 buf[3] |= 0x20;
 641                 buf[4] = stuffing_len - 1;
 642                 if (stuffing_len >= 2) {
 643                     buf[5] = 0x00;
 644                     memset(buf + 6, 0xff, stuffing_len - 2);
 645                 }
 646             }
 647         }
 648         memcpy(buf + TS_PACKET_SIZE - len, payload, len);
 649         payload += len;
 650         payload_size -= len;
 651         put_buffer(&s->pb, buf, TS_PACKET_SIZE);
 652     }
 653     put_flush_packet(&s->pb);
 654 }
 655
 656 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
 657 {
 658     AVStream *st = s->streams[pkt->stream_index];
 659     int size= pkt->size;
 660     uint8_t *buf= pkt->data;
 661     MpegTSWriteStream *ts_st = st->priv_data;
 662     int len, max_payload_size;
 663
 664     if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
 665         /* for subtitle, a single PES packet must be generated */
 666         mpegts_write_pes(s, st, buf, size, pkt->pts);
 667         return 0;
 668     }
 669
 670     max_payload_size = DEFAULT_PES_PAYLOAD_SIZE;
 671     while (size > 0) {
 672         len = max_payload_size - ts_st->payload_index;
 673         if (len > size)
 674             len = size;
 675         memcpy(ts_st->payload + ts_st->payload_index, buf, len);
 676         buf += len;
 677         size -= len;
 678         ts_st->payload_index += len;
 679         if (ts_st->payload_pts == AV_NOPTS_VALUE)
 680             ts_st->payload_pts = pkt->pts;
 681         if (ts_st->payload_index >= max_payload_size) {
 682             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
 683                              ts_st->payload_pts);
 684             ts_st->payload_pts = AV_NOPTS_VALUE;
 685             ts_st->payload_index = 0;
 686         }
 687     }
 688     return 0;
 689 }
 690
 691 static int mpegts_write_end(AVFormatContext *s)
 692 {
 693     MpegTSWrite *ts = s->priv_data;
 694     MpegTSWriteStream *ts_st;
 695     MpegTSService *service;
 696     AVStream *st;
 697     int i;
 698
 699     /* flush current packets */
 700     for(i = 0; i < s->nb_streams; i++) {
 701         st = s->streams[i];
 702         ts_st = st->priv_data;
 703         if (ts_st->payload_index > 0) {
 704             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
 705                              ts_st->payload_pts);
 706         }
 707     }
 708     put_flush_packet(&s->pb);
 709
 710     for(i = 0; i < ts->nb_services; i++) {
 711         service = ts->services[i];
 712         av_freep(&service->provider_name);
 713         av_freep(&service->name);
 714         av_free(service);
 715     }
 716     av_free(ts->services);
 717
 718     return 0;
 719 }
 720
 721 AVOutputFormat mpegts_mux = {
 722     "mpegts",
 723     "MPEG2 transport stream format",
 724     "video/x-mpegts",
 725     "ts",
 726     sizeof(MpegTSWrite),
 727     CODEC_ID_MP2,
 728     CODEC_ID_MPEG2VIDEO,
 729     mpegts_write_header,
 730     mpegts_write_packet,
 731     mpegts_write_end,
 732 };
 733 #endif // CONFIG_MUXERS