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 "internal.h" 27#include "mpegts.h" 28#include "adts.h" 29 30/* write DVB SI sections */ 31 32/*********************************************/ 33/* mpegts section writer */ 34 35typedef struct MpegTSSection { 36 int pid; 37 int cc; 38 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet); 39 void *opaque; 40} MpegTSSection; 41 42typedef struct MpegTSService { 43 MpegTSSection pmt; /* MPEG2 pmt table context */ 44 int sid; /* service ID */ 45 char *name; 46 char *provider_name; 47 int pcr_pid; 48 int pcr_packet_count; 49 int pcr_packet_period; 50} MpegTSService; 51 52typedef struct MpegTSWrite { 53 MpegTSSection pat; /* MPEG2 pat table */ 54 MpegTSSection sdt; /* MPEG2 sdt table context */ 55 MpegTSService **services; 56 int sdt_packet_count; 57 int sdt_packet_period; 58 int pat_packet_count; 59 int pat_packet_period; 60 int nb_services; 61 int onid; 62 int tsid; 63 uint64_t cur_pcr; 64 int mux_rate; ///< set to 1 when VBR 65} MpegTSWrite; 66 67/* NOTE: 4 bytes must be left at the end for the crc32 */ 68static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len) 69{ 70 MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data; 71 unsigned int crc; 72 unsigned char packet[TS_PACKET_SIZE]; 73 const unsigned char *buf_ptr; 74 unsigned char *q; 75 int first, b, len1, left; 76 77 crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4)); 78 buf[len - 4] = (crc >> 24) & 0xff; 79 buf[len - 3] = (crc >> 16) & 0xff; 80 buf[len - 2] = (crc >> 8) & 0xff; 81 buf[len - 1] = (crc) & 0xff; 82 83 /* send each packet */ 84 buf_ptr = buf; 85 while (len > 0) { 86 first = (buf == buf_ptr); 87 q = packet; 88 *q++ = 0x47; 89 b = (s->pid >> 8); 90 if (first) 91 b |= 0x40; 92 *q++ = b; 93 *q++ = s->pid; 94 s->cc = (s->cc + 1) & 0xf; 95 *q++ = 0x10 | s->cc; 96 if (first) 97 *q++ = 0; /* 0 offset */ 98 len1 = TS_PACKET_SIZE - (q - packet); 99 if (len1 > len) 100 len1 = len; 101 memcpy(q, buf_ptr, len1); 102 q += len1; 103 /* add known padding data */ 104 left = TS_PACKET_SIZE - (q - packet); 105 if (left > 0) 106 memset(q, 0xff, left); 107 108 s->write_packet(s, packet); 109 110 buf_ptr += len1; 111 len -= len1; 112 113 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; 114 } 115} 116 117static inline void put16(uint8_t **q_ptr, int val) 118{ 119 uint8_t *q; 120 q = *q_ptr; 121 *q++ = val >> 8; 122 *q++ = val; 123 *q_ptr = q; 124} 125 126static int mpegts_write_section1(MpegTSSection *s, int tid, int id, 127 int version, int sec_num, int last_sec_num, 128 uint8_t *buf, int len) 129{ 130 uint8_t section[1024], *q; 131 unsigned int tot_len; 132 133 tot_len = 3 + 5 + len + 4; 134 /* check if not too big */ 135 if (tot_len > 1024) 136 return -1; 137 138 q = section; 139 *q++ = tid; 140 put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */ 141 put16(&q, id); 142 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */ 143 *q++ = sec_num; 144 *q++ = last_sec_num; 145 memcpy(q, buf, len); 146 147 mpegts_write_section(s, section, tot_len); 148 return 0; 149} 150 151/*********************************************/ 152/* mpegts writer */ 153 154#define DEFAULT_PMT_START_PID 0x1000 155#define DEFAULT_START_PID 0x0100 156#define DEFAULT_PROVIDER_NAME "FFmpeg" 157#define DEFAULT_SERVICE_NAME "Service01" 158 159/* default network id, transport stream and service identifiers */ 160#define DEFAULT_ONID 0x0001 161#define DEFAULT_TSID 0x0001 162#define DEFAULT_SID 0x0001 163 164/* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */ 165#define DEFAULT_PES_HEADER_FREQ 16 166#define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170) 167 168/* we retransmit the SI info at this rate */ 169#define SDT_RETRANS_TIME 500 170#define PAT_RETRANS_TIME 100 171#define PCR_RETRANS_TIME 20 172 173typedef struct MpegTSWriteStream { 174 struct MpegTSService *service; 175 int pid; /* stream associated pid */ 176 int cc; 177 int payload_index; 178 int first_pts_check; ///< first pts check needed 179 int64_t payload_pts; 180 int64_t payload_dts; 181 uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE]; 182 ADTSContext *adts; 183} MpegTSWriteStream; 184 185static void mpegts_write_pat(AVFormatContext *s) 186{ 187 MpegTSWrite *ts = s->priv_data; 188 MpegTSService *service; 189 uint8_t data[1012], *q; 190 int i; 191 192 q = data; 193 for(i = 0; i < ts->nb_services; i++) { 194 service = ts->services[i]; 195 put16(&q, service->sid); 196 put16(&q, 0xe000 | service->pmt.pid); 197 } 198 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0, 199 data, q - data); 200} 201 202static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service) 203{ 204 // MpegTSWrite *ts = s->priv_data; 205 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr; 206 int val, stream_type, i; 207 208 q = data; 209 put16(&q, 0xe000 | service->pcr_pid); 210 211 program_info_length_ptr = q; 212 q += 2; /* patched after */ 213 214 /* put program info here */ 215 216 val = 0xf000 | (q - program_info_length_ptr - 2); 217 program_info_length_ptr[0] = val >> 8; 218 program_info_length_ptr[1] = val; 219 220 for(i = 0; i < s->nb_streams; i++) { 221 AVStream *st = s->streams[i]; 222 MpegTSWriteStream *ts_st = st->priv_data; 223 AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0); 224 switch(st->codec->codec_id) { 225 case CODEC_ID_MPEG1VIDEO: 226 case CODEC_ID_MPEG2VIDEO: 227 stream_type = STREAM_TYPE_VIDEO_MPEG2; 228 break; 229 case CODEC_ID_MPEG4: 230 stream_type = STREAM_TYPE_VIDEO_MPEG4; 231 break; 232 case CODEC_ID_H264: 233 stream_type = STREAM_TYPE_VIDEO_H264; 234 break; 235 case CODEC_ID_DIRAC: 236 stream_type = STREAM_TYPE_VIDEO_DIRAC; 237 break; 238 case CODEC_ID_MP2: 239 case CODEC_ID_MP3: 240 stream_type = STREAM_TYPE_AUDIO_MPEG1; 241 break; 242 case CODEC_ID_AAC: 243 stream_type = STREAM_TYPE_AUDIO_AAC; 244 break; 245 case CODEC_ID_AC3: 246 stream_type = STREAM_TYPE_AUDIO_AC3; 247 break; 248 default: 249 stream_type = STREAM_TYPE_PRIVATE_DATA; 250 break; 251 } 252 *q++ = stream_type; 253 put16(&q, 0xe000 | ts_st->pid); 254 desc_length_ptr = q; 255 q += 2; /* patched after */ 256 257 /* write optional descriptors here */ 258 switch(st->codec->codec_type) { 259 case AVMEDIA_TYPE_AUDIO: 260 if (lang && strlen(lang->value) == 3) { 261 *q++ = 0x0a; /* ISO 639 language descriptor */ 262 *q++ = 4; 263 *q++ = lang->value[0]; 264 *q++ = lang->value[1]; 265 *q++ = lang->value[2]; 266 *q++ = 0; /* undefined type */ 267 } 268 break; 269 case AVMEDIA_TYPE_SUBTITLE: 270 { 271 const char *language; 272 language = lang && strlen(lang->value)==3 ? lang->value : "eng"; 273 *q++ = 0x59; 274 *q++ = 8; 275 *q++ = language[0]; 276 *q++ = language[1]; 277 *q++ = language[2]; 278 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */ 279 put16(&q, 1); /* page id */ 280 put16(&q, 1); /* ancillary page id */ 281 } 282 break; 283 case AVMEDIA_TYPE_VIDEO: 284 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) { 285 *q++ = 0x05; /*MPEG-2 registration descriptor*/ 286 *q++ = 4; 287 *q++ = 'd'; 288 *q++ = 'r'; 289 *q++ = 'a'; 290 *q++ = 'c'; 291 } 292 break; 293 } 294 295 val = 0xf000 | (q - desc_length_ptr - 2); 296 desc_length_ptr[0] = val >> 8; 297 desc_length_ptr[1] = val; 298 } 299 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0, 300 data, q - data); 301} 302 303/* NOTE: str == NULL is accepted for an empty string */ 304static void putstr8(uint8_t **q_ptr, const char *str) 305{ 306 uint8_t *q; 307 int len; 308 309 q = *q_ptr; 310 if (!str) 311 len = 0; 312 else 313 len = strlen(str); 314 *q++ = len; 315 memcpy(q, str, len); 316 q += len; 317 *q_ptr = q; 318} 319 320static void mpegts_write_sdt(AVFormatContext *s) 321{ 322 MpegTSWrite *ts = s->priv_data; 323 MpegTSService *service; 324 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr; 325 int i, running_status, free_ca_mode, val; 326 327 q = data; 328 put16(&q, ts->onid); 329 *q++ = 0xff; 330 for(i = 0; i < ts->nb_services; i++) { 331 service = ts->services[i]; 332 put16(&q, service->sid); 333 *q++ = 0xfc | 0x00; /* currently no EIT info */ 334 desc_list_len_ptr = q; 335 q += 2; 336 running_status = 4; /* running */ 337 free_ca_mode = 0; 338 339 /* write only one descriptor for the service name and provider */ 340 *q++ = 0x48; 341 desc_len_ptr = q; 342 q++; 343 *q++ = 0x01; /* digital television service */ 344 putstr8(&q, service->provider_name); 345 putstr8(&q, service->name); 346 desc_len_ptr[0] = q - desc_len_ptr - 1; 347 348 /* fill descriptor length */ 349 val = (running_status << 13) | (free_ca_mode << 12) | 350 (q - desc_list_len_ptr - 2); 351 desc_list_len_ptr[0] = val >> 8; 352 desc_list_len_ptr[1] = val; 353 } 354 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0, 355 data, q - data); 356} 357 358static MpegTSService *mpegts_add_service(MpegTSWrite *ts, 359 int sid, 360 const char *provider_name, 361 const char *name) 362{ 363 MpegTSService *service; 364 365 service = av_mallocz(sizeof(MpegTSService)); 366 if (!service) 367 return NULL; 368 service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1; 369 service->sid = sid; 370 service->provider_name = av_strdup(provider_name); 371 service->name = av_strdup(name); 372 service->pcr_pid = 0x1fff; 373 dynarray_add(&ts->services, &ts->nb_services, service); 374 return service; 375} 376 377static void section_write_packet(MpegTSSection *s, const uint8_t *packet) 378{ 379 AVFormatContext *ctx = s->opaque; 380 put_buffer(ctx->pb, packet, TS_PACKET_SIZE); 381} 382 383static int mpegts_write_header(AVFormatContext *s) 384{ 385 MpegTSWrite *ts = s->priv_data; 386 MpegTSWriteStream *ts_st; 387 MpegTSService *service; 388 AVStream *st, *pcr_st = NULL; 389 AVMetadataTag *title; 390 int i; 391 const char *service_name; 392 393 ts->tsid = DEFAULT_TSID; 394 ts->onid = DEFAULT_ONID; 395 /* allocate a single DVB service */ 396 title = av_metadata_get(s->metadata, "title", NULL, 0); 397 service_name = title ? title->value : DEFAULT_SERVICE_NAME; 398 service = mpegts_add_service(ts, DEFAULT_SID, 399 DEFAULT_PROVIDER_NAME, service_name); 400 service->pmt.write_packet = section_write_packet; 401 service->pmt.opaque = s; 402 service->pmt.cc = 15; 403 404 ts->pat.pid = PAT_PID; 405 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write 406 ts->pat.write_packet = section_write_packet; 407 ts->pat.opaque = s; 408 409 ts->sdt.pid = SDT_PID; 410 ts->sdt.cc = 15; 411 ts->sdt.write_packet = section_write_packet; 412 ts->sdt.opaque = s; 413 414 /* assign pids to each stream */ 415 for(i = 0;i < s->nb_streams; i++) { 416 st = s->streams[i]; 417 ts_st = av_mallocz(sizeof(MpegTSWriteStream)); 418 if (!ts_st) 419 goto fail; 420 st->priv_data = ts_st; 421 ts_st->service = service; 422 ts_st->pid = DEFAULT_START_PID + i; 423 ts_st->payload_pts = AV_NOPTS_VALUE; 424 ts_st->payload_dts = AV_NOPTS_VALUE; 425 ts_st->first_pts_check = 1; 426 ts_st->cc = 15; 427 /* update PCR pid by using the first video stream */ 428 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && 429 service->pcr_pid == 0x1fff) { 430 service->pcr_pid = ts_st->pid; 431 pcr_st = st; 432 } 433 if (st->codec->codec_id == CODEC_ID_AAC && 434 st->codec->extradata_size > 0) { 435 ts_st->adts = av_mallocz(sizeof(*ts_st->adts)); 436 if (!ts_st->adts) 437 return AVERROR(ENOMEM); 438 if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata, 439 st->codec->extradata_size) < 0) 440 return -1; 441 } 442 } 443 444 /* if no video stream, use the first stream as PCR */ 445 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) { 446 pcr_st = s->streams[0]; 447 ts_st = pcr_st->priv_data; 448 service->pcr_pid = ts_st->pid; 449 } 450 451 ts->mux_rate = s->mux_rate ? s->mux_rate : 1; 452 453 if (ts->mux_rate > 1) { 454 service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) / 455 (TS_PACKET_SIZE * 8 * 1000); 456 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) / 457 (TS_PACKET_SIZE * 8 * 1000); 458 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) / 459 (TS_PACKET_SIZE * 8 * 1000); 460 461 ts->cur_pcr = av_rescale(s->max_delay, 90000, AV_TIME_BASE); 462 } else { 463 /* Arbitrary values, PAT/PMT could be written on key frames */ 464 ts->sdt_packet_period = 200; 465 ts->pat_packet_period = 40; 466 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { 467 if (!pcr_st->codec->frame_size) { 468 av_log(s, AV_LOG_WARNING, "frame size not set\n"); 469 service->pcr_packet_period = 470 pcr_st->codec->sample_rate/(10*512); 471 } else { 472 service->pcr_packet_period = 473 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size); 474 } 475 } else { 476 // max delta PCR 0.1s 477 service->pcr_packet_period = 478 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num); 479 } 480 } 481 482 // output a PCR as soon as possible 483 service->pcr_packet_count = service->pcr_packet_period; 484 ts->pat_packet_count = ts->pat_packet_period-1; 485 ts->sdt_packet_count = ts->sdt_packet_period-1; 486 487 av_log(s, AV_LOG_INFO, 488 "muxrate %d bps, pcr every %d pkts, " 489 "sdt every %d, pat/pmt every %d pkts\n", 490 ts->mux_rate, service->pcr_packet_period, 491 ts->sdt_packet_period, ts->pat_packet_period); 492 493 494 put_flush_packet(s->pb); 495 496 return 0; 497 498 fail: 499 for(i = 0;i < s->nb_streams; i++) { 500 st = s->streams[i]; 501 av_free(st->priv_data); 502 } 503 return -1; 504} 505 506/* send SDT, PAT and PMT tables regulary */ 507static void retransmit_si_info(AVFormatContext *s) 508{ 509 MpegTSWrite *ts = s->priv_data; 510 int i; 511 512 if (++ts->sdt_packet_count == ts->sdt_packet_period) { 513 ts->sdt_packet_count = 0; 514 mpegts_write_sdt(s); 515 } 516 if (++ts->pat_packet_count == ts->pat_packet_period) { 517 ts->pat_packet_count = 0; 518 mpegts_write_pat(s); 519 for(i = 0; i < ts->nb_services; i++) { 520 mpegts_write_pmt(s, ts->services[i]); 521 } 522 } 523} 524 525/* Write a single null transport stream packet */ 526static void mpegts_insert_null_packet(AVFormatContext *s) 527{ 528 MpegTSWrite *ts = s->priv_data; 529 uint8_t *q; 530 uint8_t buf[TS_PACKET_SIZE]; 531 532 q = buf; 533 *q++ = 0x47; 534 *q++ = 0x00 | 0x1f; 535 *q++ = 0xff; 536 *q++ = 0x10; 537 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf)); 538 put_buffer(s->pb, buf, TS_PACKET_SIZE); 539 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; 540} 541 542/* Write a single transport stream packet with a PCR and no payload */ 543static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st) 544{ 545 MpegTSWrite *ts = s->priv_data; 546 MpegTSWriteStream *ts_st = st->priv_data; 547 uint8_t *q; 548 uint64_t pcr = ts->cur_pcr; 549 uint8_t buf[TS_PACKET_SIZE]; 550 551 q = buf; 552 *q++ = 0x47; 553 *q++ = ts_st->pid >> 8; 554 *q++ = ts_st->pid; 555 *q++ = 0x20 | ts_st->cc; /* Adaptation only */ 556 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */ 557 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */ 558 *q++ = 0x10; /* Adaptation flags: PCR present */ 559 560 /* PCR coded into 6 bytes */ 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 /* stuffing bytes */ 569 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf)); 570 put_buffer(s->pb, buf, TS_PACKET_SIZE); 571 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; 572} 573 574static void write_pts(uint8_t *q, int fourbits, int64_t pts) 575{ 576 int val; 577 578 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1; 579 *q++ = val; 580 val = (((pts >> 15) & 0x7fff) << 1) | 1; 581 *q++ = val >> 8; 582 *q++ = val; 583 val = (((pts) & 0x7fff) << 1) | 1; 584 *q++ = val >> 8; 585 *q++ = val; 586} 587 588/* Add a pes header to the front of payload, and segment into an integer number of 589 * ts packets. The final ts packet is padded using an over-sized adaptation header 590 * to exactly fill the last ts packet. 591 * NOTE: 'payload' contains a complete PES payload. 592 */ 593static void mpegts_write_pes(AVFormatContext *s, AVStream *st, 594 const uint8_t *payload, int payload_size, 595 int64_t pts, int64_t dts) 596{ 597 MpegTSWriteStream *ts_st = st->priv_data; 598 MpegTSWrite *ts = s->priv_data; 599 uint8_t buf[TS_PACKET_SIZE]; 600 uint8_t *q; 601 int val, is_start, len, header_len, write_pcr, private_code, flags; 602 int afc_len, stuffing_len; 603 int64_t pcr = -1; /* avoid warning */ 604 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE); 605 606 is_start = 1; 607 while (payload_size > 0) { 608 retransmit_si_info(s); 609 610 write_pcr = 0; 611 if (ts_st->pid == ts_st->service->pcr_pid) { 612 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames 613 ts_st->service->pcr_packet_count++; 614 if (ts_st->service->pcr_packet_count >= 615 ts_st->service->pcr_packet_period) { 616 ts_st->service->pcr_packet_count = 0; 617 write_pcr = 1; 618 } 619 } 620 621 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE && 622 (dts - (int64_t)ts->cur_pcr) > delay) { 623 /* pcr insert gets priority over null packet insert */ 624 if (write_pcr) 625 mpegts_insert_pcr_only(s, st); 626 else 627 mpegts_insert_null_packet(s); 628 continue; /* recalculate write_pcr and possibly retransmit si_info */ 629 } 630 631 /* prepare packet header */ 632 q = buf; 633 *q++ = 0x47; 634 val = (ts_st->pid >> 8); 635 if (is_start) 636 val |= 0x40; 637 *q++ = val; 638 *q++ = ts_st->pid; 639 ts_st->cc = (ts_st->cc + 1) & 0xf; 640 *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0); 641 if (write_pcr) { 642 // add 11, pcr references the last byte of program clock reference base 643 if (ts->mux_rate > 1) 644 pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate; 645 else 646 pcr = dts - delay; 647 if (dts != AV_NOPTS_VALUE && dts < pcr) 648 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n"); 649 *q++ = 7; /* AFC length */ 650 *q++ = 0x10; /* flags: PCR present */ 651 *q++ = pcr >> 25; 652 *q++ = pcr >> 17; 653 *q++ = pcr >> 9; 654 *q++ = pcr >> 1; 655 *q++ = (pcr & 1) << 7; 656 *q++ = 0; 657 } 658 if (is_start) { 659 int pes_extension = 0; 660 /* write PES header */ 661 *q++ = 0x00; 662 *q++ = 0x00; 663 *q++ = 0x01; 664 private_code = 0; 665 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { 666 if (st->codec->codec_id == CODEC_ID_DIRAC) { 667 *q++ = 0xfd; 668 } else 669 *q++ = 0xe0; 670 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && 671 (st->codec->codec_id == CODEC_ID_MP2 || 672 st->codec->codec_id == CODEC_ID_MP3)) { 673 *q++ = 0xc0; 674 } else { 675 *q++ = 0xbd; 676 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) { 677 private_code = 0x20; 678 } 679 } 680 header_len = 0; 681 flags = 0; 682 if (pts != AV_NOPTS_VALUE) { 683 header_len += 5; 684 flags |= 0x80; 685 } 686 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) { 687 header_len += 5; 688 flags |= 0x40; 689 } 690 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && 691 st->codec->codec_id == CODEC_ID_DIRAC) { 692 /* set PES_extension_flag */ 693 pes_extension = 1; 694 flags |= 0x01; 695 696 /* 697 * One byte for PES2 extension flag + 698 * one byte for extension length + 699 * one byte for extension id 700 */ 701 header_len += 3; 702 } 703 len = payload_size + header_len + 3; 704 if (private_code != 0) 705 len++; 706 if (len > 0xffff) 707 len = 0; 708 *q++ = len >> 8; 709 *q++ = len; 710 val = 0x80; 711 /* data alignment indicator is required for subtitle data */ 712 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) 713 val |= 0x04; 714 *q++ = val; 715 *q++ = flags; 716 *q++ = header_len; 717 if (pts != AV_NOPTS_VALUE) { 718 write_pts(q, flags >> 6, pts); 719 q += 5; 720 } 721 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) { 722 write_pts(q, 1, dts); 723 q += 5; 724 } 725 if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) { 726 flags = 0x01; /* set PES_extension_flag_2 */ 727 *q++ = flags; 728 *q++ = 0x80 | 0x01; /* marker bit + extension length */ 729 /* 730 * Set the stream id extension flag bit to 0 and 731 * write the extended stream id 732 */ 733 *q++ = 0x00 | 0x60; 734 } 735 if (private_code != 0) 736 *q++ = private_code; 737 is_start = 0; 738 } 739 /* header size */ 740 header_len = q - buf; 741 /* data len */ 742 len = TS_PACKET_SIZE - header_len; 743 if (len > payload_size) 744 len = payload_size; 745 stuffing_len = TS_PACKET_SIZE - header_len - len; 746 if (stuffing_len > 0) { 747 /* add stuffing with AFC */ 748 if (buf[3] & 0x20) { 749 /* stuffing already present: increase its size */ 750 afc_len = buf[4] + 1; 751 memmove(buf + 4 + afc_len + stuffing_len, 752 buf + 4 + afc_len, 753 header_len - (4 + afc_len)); 754 buf[4] += stuffing_len; 755 memset(buf + 4 + afc_len, 0xff, stuffing_len); 756 } else { 757 /* add stuffing */ 758 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4); 759 buf[3] |= 0x20; 760 buf[4] = stuffing_len - 1; 761 if (stuffing_len >= 2) { 762 buf[5] = 0x00; 763 memset(buf + 6, 0xff, stuffing_len - 2); 764 } 765 } 766 } 767 memcpy(buf + TS_PACKET_SIZE - len, payload, len); 768 payload += len; 769 payload_size -= len; 770 put_buffer(s->pb, buf, TS_PACKET_SIZE); 771 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; 772 } 773 put_flush_packet(s->pb); 774} 775 776static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt) 777{ 778 AVStream *st = s->streams[pkt->stream_index]; 779 int size = pkt->size; 780 uint8_t *buf= pkt->data; 781 uint8_t *data= NULL; 782 MpegTSWriteStream *ts_st = st->priv_data; 783 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2; 784 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE; 785 786 if (pkt->pts != AV_NOPTS_VALUE) 787 pts = pkt->pts + delay; 788 if (pkt->dts != AV_NOPTS_VALUE) 789 dts = pkt->dts + delay; 790 791 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) { 792 av_log(s, AV_LOG_ERROR, "first pts value must set\n"); 793 return -1; 794 } 795 ts_st->first_pts_check = 0; 796 797 if (st->codec->codec_id == CODEC_ID_H264) { 798 const uint8_t *p = buf, *buf_end = p+size; 799 uint32_t state = -1; 800 801 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) { 802 av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, " 803 "no startcode found, use -vbsf h264_mp4toannexb\n"); 804 return -1; 805 } 806 807 do { 808 p = ff_find_start_code(p, buf_end, &state); 809 //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f); 810 } while (p < buf_end && (state & 0x1f) != 9 && 811 (state & 0x1f) != 5 && (state & 0x1f) != 1); 812 813 if ((state & 0x1f) != 9) { // AUD NAL 814 data = av_malloc(pkt->size+6); 815 if (!data) 816 return -1; 817 memcpy(data+6, pkt->data, pkt->size); 818 AV_WB32(data, 0x00000001); 819 data[4] = 0x09; 820 data[5] = 0xe0; // any slice type 821 buf = data; 822 size = pkt->size+6; 823 } 824 } else if (st->codec->codec_id == CODEC_ID_AAC) { 825 if (pkt->size < 2) 826 return -1; 827 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) { 828 ADTSContext *adts = ts_st->adts; 829 int new_size; 830 if (!adts) { 831 av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format " 832 "and extradata missing\n"); 833 return -1; 834 } 835 new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size; 836 if ((unsigned)new_size >= INT_MAX) 837 return -1; 838 data = av_malloc(new_size); 839 if (!data) 840 return AVERROR(ENOMEM); 841 ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size); 842 if (adts->pce_size) { 843 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size); 844 adts->pce_size = 0; 845 } 846 memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size); 847 buf = data; 848 size = new_size; 849 } 850 } 851 852 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) { 853 // for video and subtitle, write a single pes packet 854 mpegts_write_pes(s, st, buf, size, pts, dts); 855 av_free(data); 856 return 0; 857 } 858 859 if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) { 860 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, 861 ts_st->payload_pts, ts_st->payload_dts); 862 ts_st->payload_index = 0; 863 } 864 865 if (!ts_st->payload_index) { 866 ts_st->payload_pts = pts; 867 ts_st->payload_dts = dts; 868 } 869 870 memcpy(ts_st->payload + ts_st->payload_index, buf, size); 871 ts_st->payload_index += size; 872 873 av_free(data); 874 875 return 0; 876} 877 878static int mpegts_write_end(AVFormatContext *s) 879{ 880 MpegTSWrite *ts = s->priv_data; 881 MpegTSWriteStream *ts_st; 882 MpegTSService *service; 883 AVStream *st; 884 int i; 885 886 /* flush current packets */ 887 for(i = 0; i < s->nb_streams; i++) { 888 st = s->streams[i]; 889 ts_st = st->priv_data; 890 if (ts_st->payload_index > 0) { 891 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, 892 ts_st->payload_pts, ts_st->payload_dts); 893 } 894 av_freep(&ts_st->adts); 895 } 896 put_flush_packet(s->pb); 897 898 for(i = 0; i < ts->nb_services; i++) { 899 service = ts->services[i]; 900 av_freep(&service->provider_name); 901 av_freep(&service->name); 902 av_free(service); 903 } 904 av_free(ts->services); 905 906 return 0; 907} 908 909AVOutputFormat mpegts_muxer = { 910 "mpegts", 911 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"), 912 "video/x-mpegts", 913 "ts,m2t", 914 sizeof(MpegTSWrite), 915 CODEC_ID_MP2, 916 CODEC_ID_MPEG2VIDEO, 917 mpegts_write_header, 918 mpegts_write_packet, 919 mpegts_write_end, 920}; 921