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/bswap.h" 23#include "libavutil/crc.h" 24#include "libavcodec/mpegvideo.h" 25#include "avformat.h" 26#include "mpegts.h" 27 28/* write DVB SI sections */ 29 30/*********************************************/ 31/* mpegts section writer */ 32 33typedef struct MpegTSSection { 34 int pid; 35 int cc; 36 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet); 37 void *opaque; 38} MpegTSSection; 39 40typedef struct MpegTSService { 41 MpegTSSection pmt; /* MPEG2 pmt table context */ 42 int sid; /* service ID */ 43 char *name; 44 char *provider_name; 45 int pcr_pid; 46 int pcr_packet_count; 47 int pcr_packet_freq; 48} MpegTSService; 49 50typedef struct MpegTSWrite { 51 MpegTSSection pat; /* MPEG2 pat table */ 52 MpegTSSection sdt; /* MPEG2 sdt table context */ 53 MpegTSService **services; 54 int sdt_packet_count; 55 int sdt_packet_freq; 56 int pat_packet_count; 57 int pat_packet_freq; 58 int nb_services; 59 int onid; 60 int tsid; 61 uint64_t cur_pcr; 62 int mux_rate; 63} MpegTSWrite; 64 65/* NOTE: 4 bytes must be left at the end for the crc32 */ 66static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len) 67{ 68 MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data; 69 unsigned int crc; 70 unsigned char packet[TS_PACKET_SIZE]; 71 const unsigned char *buf_ptr; 72 unsigned char *q; 73 int first, b, len1, left; 74 75 crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4)); 76 buf[len - 4] = (crc >> 24) & 0xff; 77 buf[len - 3] = (crc >> 16) & 0xff; 78 buf[len - 2] = (crc >> 8) & 0xff; 79 buf[len - 1] = (crc) & 0xff; 80 81 /* send each packet */ 82 buf_ptr = buf; 83 while (len > 0) { 84 first = (buf == buf_ptr); 85 q = packet; 86 *q++ = 0x47; 87 b = (s->pid >> 8); 88 if (first) 89 b |= 0x40; 90 *q++ = b; 91 *q++ = s->pid; 92 *q++ = 0x10 | s->cc; 93 s->cc = (s->cc + 1) & 0xf; 94 if (first) 95 *q++ = 0; /* 0 offset */ 96 len1 = TS_PACKET_SIZE - (q - packet); 97 if (len1 > len) 98 len1 = len; 99 memcpy(q, buf_ptr, len1); 100 q += len1; 101 /* add known padding data */ 102 left = TS_PACKET_SIZE - (q - packet); 103 if (left > 0) 104 memset(q, 0xff, left); 105 106 s->write_packet(s, packet); 107 108 buf_ptr += len1; 109 len -= len1; 110 111 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; 112 } 113} 114 115static inline void put16(uint8_t **q_ptr, int val) 116{ 117 uint8_t *q; 118 q = *q_ptr; 119 *q++ = val >> 8; 120 *q++ = val; 121 *q_ptr = q; 122} 123 124static int mpegts_write_section1(MpegTSSection *s, int tid, int id, 125 int version, int sec_num, int last_sec_num, 126 uint8_t *buf, int len) 127{ 128 uint8_t section[1024], *q; 129 unsigned int tot_len; 130 131 tot_len = 3 + 5 + len + 4; 132 /* check if not too big */ 133 if (tot_len > 1024) 134 return -1; 135 136 q = section; 137 *q++ = tid; 138 put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */ 139 put16(&q, id); 140 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */ 141 *q++ = sec_num; 142 *q++ = last_sec_num; 143 memcpy(q, buf, len); 144 145 mpegts_write_section(s, section, tot_len); 146 return 0; 147} 148 149/*********************************************/ 150/* mpegts writer */ 151 152#define DEFAULT_PMT_START_PID 0x1000 153#define DEFAULT_START_PID 0x0100 154#define DEFAULT_PROVIDER_NAME "FFmpeg" 155#define DEFAULT_SERVICE_NAME "Service01" 156 157/* default network id, transport stream and service identifiers */ 158#define DEFAULT_ONID 0x0001 159#define DEFAULT_TSID 0x0001 160#define DEFAULT_SID 0x0001 161 162/* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */ 163#define DEFAULT_PES_HEADER_FREQ 16 164#define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170) 165 166/* we retransmit the SI info at this rate */ 167#define SDT_RETRANS_TIME 500 168#define PAT_RETRANS_TIME 100 169#define PCR_RETRANS_TIME 20 170 171typedef struct MpegTSWriteStream { 172 struct MpegTSService *service; 173 int pid; /* stream associated pid */ 174 int cc; 175 int payload_index; 176 int64_t payload_pts; 177 int64_t payload_dts; 178 uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE]; 179} MpegTSWriteStream; 180 181static void mpegts_write_pat(AVFormatContext *s) 182{ 183 MpegTSWrite *ts = s->priv_data; 184 MpegTSService *service; 185 uint8_t data[1012], *q; 186 int i; 187 188 q = data; 189 for(i = 0; i < ts->nb_services; i++) { 190 service = ts->services[i]; 191 put16(&q, service->sid); 192 put16(&q, 0xe000 | service->pmt.pid); 193 } 194 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0, 195 data, q - data); 196} 197 198static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service) 199{ 200 // MpegTSWrite *ts = s->priv_data; 201 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr; 202 int val, stream_type, i; 203 204 q = data; 205 put16(&q, 0xe000 | service->pcr_pid); 206 207 program_info_length_ptr = q; 208 q += 2; /* patched after */ 209 210 /* put program info here */ 211 212 val = 0xf000 | (q - program_info_length_ptr - 2); 213 program_info_length_ptr[0] = val >> 8; 214 program_info_length_ptr[1] = val; 215 216 for(i = 0; i < s->nb_streams; i++) { 217 AVStream *st = s->streams[i]; 218 MpegTSWriteStream *ts_st = st->priv_data; 219 AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0); 220 switch(st->codec->codec_id) { 221 case CODEC_ID_MPEG1VIDEO: 222 case CODEC_ID_MPEG2VIDEO: 223 stream_type = STREAM_TYPE_VIDEO_MPEG2; 224 break; 225 case CODEC_ID_MPEG4: 226 stream_type = STREAM_TYPE_VIDEO_MPEG4; 227 break; 228 case CODEC_ID_H264: 229 stream_type = STREAM_TYPE_VIDEO_H264; 230 break; 231 case CODEC_ID_DIRAC: 232 stream_type = STREAM_TYPE_VIDEO_DIRAC; 233 break; 234 case CODEC_ID_MP2: 235 case CODEC_ID_MP3: 236 stream_type = STREAM_TYPE_AUDIO_MPEG1; 237 break; 238 case CODEC_ID_AAC: 239 stream_type = STREAM_TYPE_AUDIO_AAC; 240 break; 241 case CODEC_ID_AC3: 242 stream_type = STREAM_TYPE_AUDIO_AC3; 243 break; 244 default: 245 stream_type = STREAM_TYPE_PRIVATE_DATA; 246 break; 247 } 248 *q++ = stream_type; 249 put16(&q, 0xe000 | ts_st->pid); 250 desc_length_ptr = q; 251 q += 2; /* patched after */ 252 253 /* write optional descriptors here */ 254 switch(st->codec->codec_type) { 255 case CODEC_TYPE_AUDIO: 256 if (lang && strlen(lang->value) == 3) { 257 *q++ = 0x0a; /* ISO 639 language descriptor */ 258 *q++ = 4; 259 *q++ = lang->value[0]; 260 *q++ = lang->value[1]; 261 *q++ = lang->value[2]; 262 *q++ = 0; /* undefined type */ 263 } 264 break; 265 case CODEC_TYPE_SUBTITLE: 266 { 267 const char *language; 268 language = lang && strlen(lang->value)==3 ? lang->value : "eng"; 269 *q++ = 0x59; 270 *q++ = 8; 271 *q++ = language[0]; 272 *q++ = language[1]; 273 *q++ = language[2]; 274 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */ 275 put16(&q, 1); /* page id */ 276 put16(&q, 1); /* ancillary page id */ 277 } 278 break; 279 case CODEC_TYPE_VIDEO: 280 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) { 281 *q++ = 0x05; /*MPEG-2 registration descriptor*/ 282 *q++ = 4; 283 *q++ = 'd'; 284 *q++ = 'r'; 285 *q++ = 'a'; 286 *q++ = 'c'; 287 } 288 break; 289 } 290 291 val = 0xf000 | (q - desc_length_ptr - 2); 292 desc_length_ptr[0] = val >> 8; 293 desc_length_ptr[1] = val; 294 } 295 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0, 296 data, q - data); 297} 298 299/* NOTE: str == NULL is accepted for an empty string */ 300static void putstr8(uint8_t **q_ptr, const char *str) 301{ 302 uint8_t *q; 303 int len; 304 305 q = *q_ptr; 306 if (!str) 307 len = 0; 308 else 309 len = strlen(str); 310 *q++ = len; 311 memcpy(q, str, len); 312 q += len; 313 *q_ptr = q; 314} 315 316static void mpegts_write_sdt(AVFormatContext *s) 317{ 318 MpegTSWrite *ts = s->priv_data; 319 MpegTSService *service; 320 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr; 321 int i, running_status, free_ca_mode, val; 322 323 q = data; 324 put16(&q, ts->onid); 325 *q++ = 0xff; 326 for(i = 0; i < ts->nb_services; i++) { 327 service = ts->services[i]; 328 put16(&q, service->sid); 329 *q++ = 0xfc | 0x00; /* currently no EIT info */ 330 desc_list_len_ptr = q; 331 q += 2; 332 running_status = 4; /* running */ 333 free_ca_mode = 0; 334 335 /* write only one descriptor for the service name and provider */ 336 *q++ = 0x48; 337 desc_len_ptr = q; 338 q++; 339 *q++ = 0x01; /* digital television service */ 340 putstr8(&q, service->provider_name); 341 putstr8(&q, service->name); 342 desc_len_ptr[0] = q - desc_len_ptr - 1; 343 344 /* fill descriptor length */ 345 val = (running_status << 13) | (free_ca_mode << 12) | 346 (q - desc_list_len_ptr - 2); 347 desc_list_len_ptr[0] = val >> 8; 348 desc_list_len_ptr[1] = val; 349 } 350 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0, 351 data, q - data); 352} 353 354static MpegTSService *mpegts_add_service(MpegTSWrite *ts, 355 int sid, 356 const char *provider_name, 357 const char *name) 358{ 359 MpegTSService *service; 360 361 service = av_mallocz(sizeof(MpegTSService)); 362 if (!service) 363 return NULL; 364 service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1; 365 service->sid = sid; 366 service->provider_name = av_strdup(provider_name); 367 service->name = av_strdup(name); 368 service->pcr_pid = 0x1fff; 369 dynarray_add(&ts->services, &ts->nb_services, service); 370 return service; 371} 372 373static void section_write_packet(MpegTSSection *s, const uint8_t *packet) 374{ 375 AVFormatContext *ctx = s->opaque; 376 put_buffer(ctx->pb, packet, TS_PACKET_SIZE); 377} 378 379static int mpegts_write_header(AVFormatContext *s) 380{ 381 MpegTSWrite *ts = s->priv_data; 382 MpegTSWriteStream *ts_st; 383 MpegTSService *service; 384 AVStream *st; 385 AVMetadataTag *title; 386 int i, total_bit_rate; 387 const char *service_name; 388 uint64_t sdt_size, pat_pmt_size, pos; 389 390 ts->tsid = DEFAULT_TSID; 391 ts->onid = DEFAULT_ONID; 392 /* allocate a single DVB service */ 393 title = av_metadata_get(s->metadata, "title", NULL, 0); 394 service_name = title ? title->value : DEFAULT_SERVICE_NAME; 395 service = mpegts_add_service(ts, DEFAULT_SID, 396 DEFAULT_PROVIDER_NAME, service_name); 397 service->pmt.write_packet = section_write_packet; 398 service->pmt.opaque = s; 399 400 ts->pat.pid = PAT_PID; 401 ts->pat.cc = 0; 402 ts->pat.write_packet = section_write_packet; 403 ts->pat.opaque = s; 404 405 ts->sdt.pid = SDT_PID; 406 ts->sdt.cc = 0; 407 ts->sdt.write_packet = section_write_packet; 408 ts->sdt.opaque = s; 409 410 /* assign pids to each stream */ 411 total_bit_rate = 0; 412 for(i = 0;i < s->nb_streams; i++) { 413 st = s->streams[i]; 414 ts_st = av_mallocz(sizeof(MpegTSWriteStream)); 415 if (!ts_st) 416 goto fail; 417 st->priv_data = ts_st; 418 ts_st->service = service; 419 ts_st->pid = DEFAULT_START_PID + i; 420 ts_st->payload_pts = AV_NOPTS_VALUE; 421 ts_st->payload_dts = AV_NOPTS_VALUE; 422 /* update PCR pid by using the first video stream */ 423 if (st->codec->codec_type == CODEC_TYPE_VIDEO && 424 service->pcr_pid == 0x1fff) 425 service->pcr_pid = ts_st->pid; 426 total_bit_rate += st->codec->bit_rate; 427 } 428 429 /* if no video stream, use the first stream as PCR */ 430 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) { 431 ts_st = s->streams[0]->priv_data; 432 service->pcr_pid = ts_st->pid; 433 } 434 435 if (total_bit_rate <= 8 * 1024) 436 total_bit_rate = 8 * 1024; 437 service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) / 438 (TS_PACKET_SIZE * 8 * 1000); 439 ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) / 440 (TS_PACKET_SIZE * 8 * 1000); 441 ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) / 442 (TS_PACKET_SIZE * 8 * 1000); 443 444 ts->mux_rate = 1; // avoid div by 0 445 446 /* write info at the start of the file, so that it will be fast to 447 find them */ 448 pos = url_ftell(s->pb); 449 mpegts_write_sdt(s); 450 sdt_size = url_ftell(s->pb) - pos; 451 pos = url_ftell(s->pb); 452 mpegts_write_pat(s); 453 for(i = 0; i < ts->nb_services; i++) { 454 mpegts_write_pmt(s, ts->services[i]); 455 } 456 pat_pmt_size = url_ftell(s->pb) - pos; 457 458 total_bit_rate += 459 total_bit_rate * 25 / (8 * DEFAULT_PES_PAYLOAD_SIZE) + /* PES header size */ 460 total_bit_rate * 4 / (8 * TS_PACKET_SIZE) + /* TS header size */ 461 SDT_RETRANS_TIME * sdt_size + /* SDT size */ 462 PAT_RETRANS_TIME * pat_pmt_size + /* PAT+PMT size */ 463 PCR_RETRANS_TIME * 8; /* PCR size */ 464 465 av_log(s, AV_LOG_DEBUG, "muxrate %d freq sdt %d pat %d\n", 466 total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq); 467 468 if (s->mux_rate) 469 ts->mux_rate = s->mux_rate; 470 else 471 ts->mux_rate = total_bit_rate; 472 473 // adjust pcr 474 ts->cur_pcr /= ts->mux_rate; 475 476 put_flush_packet(s->pb); 477 478 return 0; 479 480 fail: 481 for(i = 0;i < s->nb_streams; i++) { 482 st = s->streams[i]; 483 av_free(st->priv_data); 484 } 485 return -1; 486} 487 488/* send SDT, PAT and PMT tables regulary */ 489static void retransmit_si_info(AVFormatContext *s) 490{ 491 MpegTSWrite *ts = s->priv_data; 492 int i; 493 494 if (++ts->sdt_packet_count == ts->sdt_packet_freq) { 495 ts->sdt_packet_count = 0; 496 mpegts_write_sdt(s); 497 } 498 if (++ts->pat_packet_count == ts->pat_packet_freq) { 499 ts->pat_packet_count = 0; 500 mpegts_write_pat(s); 501 for(i = 0; i < ts->nb_services; i++) { 502 mpegts_write_pmt(s, ts->services[i]); 503 } 504 } 505} 506 507static void write_pts(uint8_t *q, int fourbits, int64_t pts) 508{ 509 int val; 510 511 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1; 512 *q++ = val; 513 val = (((pts >> 15) & 0x7fff) << 1) | 1; 514 *q++ = val >> 8; 515 *q++ = val; 516 val = (((pts) & 0x7fff) << 1) | 1; 517 *q++ = val >> 8; 518 *q++ = val; 519} 520 521/* NOTE: pes_data contains all the PES packet */ 522static void mpegts_write_pes(AVFormatContext *s, AVStream *st, 523 const uint8_t *payload, int payload_size, 524 int64_t pts, int64_t dts) 525{ 526 MpegTSWriteStream *ts_st = st->priv_data; 527 MpegTSWrite *ts = s->priv_data; 528 uint8_t buf[TS_PACKET_SIZE]; 529 uint8_t *q; 530 int val, is_start, len, header_len, write_pcr, private_code, flags; 531 int afc_len, stuffing_len; 532 int64_t pcr = -1; /* avoid warning */ 533 534 is_start = 1; 535 while (payload_size > 0) { 536 retransmit_si_info(s); 537 538 write_pcr = 0; 539 if (ts_st->pid == ts_st->service->pcr_pid) { 540 ts_st->service->pcr_packet_count++; 541 if (ts_st->service->pcr_packet_count >= 542 ts_st->service->pcr_packet_freq) { 543 ts_st->service->pcr_packet_count = 0; 544 write_pcr = 1; 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 // add 11, pcr references the last byte of program clock reference base 560 pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate; 561 if (dts != AV_NOPTS_VALUE && dts < pcr) 562 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n"); 563 *q++ = 7; /* AFC length */ 564 *q++ = 0x10; /* flags: PCR present */ 565 *q++ = pcr >> 25; 566 *q++ = pcr >> 17; 567 *q++ = pcr >> 9; 568 *q++ = pcr >> 1; 569 *q++ = (pcr & 1) << 7; 570 *q++ = 0; 571 } 572 if (is_start) { 573 int pes_extension = 0; 574 /* write PES header */ 575 *q++ = 0x00; 576 *q++ = 0x00; 577 *q++ = 0x01; 578 private_code = 0; 579 if (st->codec->codec_type == CODEC_TYPE_VIDEO) { 580 if (st->codec->codec_id == CODEC_ID_DIRAC) { 581 *q++ = 0xfd; 582 } else 583 *q++ = 0xe0; 584 } else if (st->codec->codec_type == CODEC_TYPE_AUDIO && 585 (st->codec->codec_id == CODEC_ID_MP2 || 586 st->codec->codec_id == CODEC_ID_MP3)) { 587 *q++ = 0xc0; 588 } else { 589 *q++ = 0xbd; 590 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) { 591 private_code = 0x20; 592 } 593 } 594 header_len = 0; 595 flags = 0; 596 if (pts != AV_NOPTS_VALUE) { 597 header_len += 5; 598 flags |= 0x80; 599 } 600 if (dts != AV_NOPTS_VALUE && dts != pts) { 601 header_len += 5; 602 flags |= 0x40; 603 } 604 if (st->codec->codec_type == CODEC_TYPE_VIDEO && 605 st->codec->codec_id == CODEC_ID_DIRAC) { 606 /* set PES_extension_flag */ 607 pes_extension = 1; 608 flags |= 0x01; 609 610 /* 611 * One byte for PES2 extension flag + 612 * one byte for extension length + 613 * one byte for extension id 614 */ 615 header_len += 3; 616 } 617 len = payload_size + header_len + 3; 618 if (private_code != 0) 619 len++; 620 *q++ = len >> 8; 621 *q++ = len; 622 val = 0x80; 623 /* data alignment indicator is required for subtitle data */ 624 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) 625 val |= 0x04; 626 *q++ = val; 627 *q++ = flags; 628 *q++ = header_len; 629 if (pts != AV_NOPTS_VALUE) { 630 write_pts(q, flags >> 6, pts); 631 q += 5; 632 } 633 if (dts != AV_NOPTS_VALUE && dts != pts) { 634 write_pts(q, 1, dts); 635 q += 5; 636 } 637 if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) { 638 flags = 0x01; /* set PES_extension_flag_2 */ 639 *q++ = flags; 640 *q++ = 0x80 | 0x01; /* marker bit + extension length */ 641 /* 642 * Set the stream id extension flag bit to 0 and 643 * write the extended stream id 644 */ 645 *q++ = 0x00 | 0x60; 646 } 647 if (private_code != 0) 648 *q++ = private_code; 649 is_start = 0; 650 } 651 /* header size */ 652 header_len = q - buf; 653 /* data len */ 654 len = TS_PACKET_SIZE - header_len; 655 if (len > payload_size) 656 len = payload_size; 657 stuffing_len = TS_PACKET_SIZE - header_len - len; 658 if (stuffing_len > 0) { 659 /* add stuffing with AFC */ 660 if (buf[3] & 0x20) { 661 /* stuffing already present: increase its size */ 662 afc_len = buf[4] + 1; 663 memmove(buf + 4 + afc_len + stuffing_len, 664 buf + 4 + afc_len, 665 header_len - (4 + afc_len)); 666 buf[4] += stuffing_len; 667 memset(buf + 4 + afc_len, 0xff, stuffing_len); 668 } else { 669 /* add stuffing */ 670 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4); 671 buf[3] |= 0x20; 672 buf[4] = stuffing_len - 1; 673 if (stuffing_len >= 2) { 674 buf[5] = 0x00; 675 memset(buf + 6, 0xff, stuffing_len - 2); 676 } 677 } 678 } 679 memcpy(buf + TS_PACKET_SIZE - len, payload, len); 680 payload += len; 681 payload_size -= len; 682 put_buffer(s->pb, buf, TS_PACKET_SIZE); 683 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; 684 } 685 put_flush_packet(s->pb); 686} 687 688static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt) 689{ 690 AVStream *st = s->streams[pkt->stream_index]; 691 int size= pkt->size; 692 uint8_t *buf= pkt->data; 693 uint8_t *data= NULL; 694 MpegTSWriteStream *ts_st = st->priv_data; 695 int len, max_payload_size; 696 const uint8_t *access_unit_index = NULL; 697 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE); 698 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE; 699 700 if (pkt->pts != AV_NOPTS_VALUE) 701 pts = pkt->pts + delay; 702 if (pkt->dts != AV_NOPTS_VALUE) 703 dts = pkt->dts + delay; 704 705 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) { 706 /* for subtitle, a single PES packet must be generated */ 707 mpegts_write_pes(s, st, buf, size, pts, AV_NOPTS_VALUE); 708 return 0; 709 } 710 711 if (st->codec->codec_id == CODEC_ID_DIRAC) { 712 /* for Dirac, a single PES packet must be generated */ 713 mpegts_write_pes(s, st, buf, size, pts, dts); 714 return 0; 715 } 716 max_payload_size = DEFAULT_PES_PAYLOAD_SIZE; 717 if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO || 718 st->codec->codec_id == CODEC_ID_MPEG1VIDEO) { 719 const uint8_t *p = pkt->data; 720 const uint8_t *end = pkt->data+pkt->size; 721 uint32_t state = -1; 722 while (p < end) { 723 p = ff_find_start_code(p, end, &state); 724 if (state == PICTURE_START_CODE) { 725 access_unit_index = p - 4; 726 break; 727 } 728 } 729 } if (st->codec->codec_id == CODEC_ID_H264) { 730 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) { 731 av_log(s, AV_LOG_ERROR, "h264 bitstream malformated\n"); 732 return -1; 733 } 734 if (pkt->data[4] != 0x09) { // AUD NAL 735 data = av_malloc(pkt->size+6); 736 if (!data) 737 return -1; 738 memcpy(data+6, pkt->data, pkt->size); 739 AV_WB32(data, 0x00000001); 740 data[4] = 0x09; 741 data[5] = 0xe0; // any slice type 742 buf = data; 743 size = pkt->size+6; 744 } 745 access_unit_index = buf; 746 } else { 747 access_unit_index = pkt->data; 748 } 749 750 if (!access_unit_index) { 751 av_log(s, AV_LOG_ERROR, "error, could not find access unit start\n"); 752 return -1; 753 } 754 755 while (size > 0) { 756 len = max_payload_size - ts_st->payload_index; 757 if (len > size) 758 len = size; 759 memcpy(ts_st->payload + ts_st->payload_index, buf, len); 760 buf += len; 761 size -= len; 762 ts_st->payload_index += len; 763 if (access_unit_index && access_unit_index < buf && 764 ts_st->payload_pts == AV_NOPTS_VALUE && 765 ts_st->payload_dts == AV_NOPTS_VALUE) { 766 ts_st->payload_dts = dts; 767 ts_st->payload_pts = pts; 768 } 769 if (ts_st->payload_index >= max_payload_size) { 770 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, 771 ts_st->payload_pts, ts_st->payload_dts); 772 ts_st->payload_pts = AV_NOPTS_VALUE; 773 ts_st->payload_dts = AV_NOPTS_VALUE; 774 ts_st->payload_index = 0; 775 access_unit_index = NULL; // unset access unit to avoid setting pts/dts again 776 } 777 } 778 779 av_free(data); 780 781 return 0; 782} 783 784static int mpegts_write_end(AVFormatContext *s) 785{ 786 MpegTSWrite *ts = s->priv_data; 787 MpegTSWriteStream *ts_st; 788 MpegTSService *service; 789 AVStream *st; 790 int i; 791 792 /* flush current packets */ 793 for(i = 0; i < s->nb_streams; i++) { 794 st = s->streams[i]; 795 ts_st = st->priv_data; 796 if (ts_st->payload_index > 0) { 797 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, 798 ts_st->payload_pts, ts_st->payload_dts); 799 } 800 } 801 put_flush_packet(s->pb); 802 803 for(i = 0; i < ts->nb_services; i++) { 804 service = ts->services[i]; 805 av_freep(&service->provider_name); 806 av_freep(&service->name); 807 av_free(service); 808 } 809 av_free(ts->services); 810 811 return 0; 812} 813 814AVOutputFormat mpegts_muxer = { 815 "mpegts", 816 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"), 817 "video/x-mpegts", 818 "ts,m2t", 819 sizeof(MpegTSWrite), 820 CODEC_ID_MP2, 821 CODEC_ID_MPEG2VIDEO, 822 mpegts_write_header, 823 mpegts_write_packet, 824 mpegts_write_end, 825}; 826