2 * MPEG2 transport stream (aka DVB) muxer
3 * Copyright (c) 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/bswap.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/dict.h"
25 #include "libavutil/mathematics.h"
26 #include "libavutil/opt.h"
27 #include "libavcodec/mpegvideo.h"
33 #define PCR_TIME_BASE 27000000
35 /* write DVB SI sections */
37 /*********************************************/
38 /* mpegts section writer */
40 typedef struct MpegTSSection {
43 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
47 typedef struct MpegTSService {
48 MpegTSSection pmt; /* MPEG2 pmt table context */
49 int sid; /* service ID */
54 int pcr_packet_period;
57 typedef struct MpegTSWrite {
58 const AVClass *av_class;
59 MpegTSSection pat; /* MPEG2 pat table */
60 MpegTSSection sdt; /* MPEG2 sdt table context */
61 MpegTSService **services;
63 int sdt_packet_period;
65 int pat_packet_period;
70 int mux_rate; ///< set to 1 when VBR
72 int transport_stream_id;
73 int original_network_id;
81 static const AVOption options[] = {
82 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
83 offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
84 { "mpegts_original_network_id", "Set original_network_id field.",
85 offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
86 { "mpegts_service_id", "Set service_id field.",
87 offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
88 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
89 offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.dbl = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
90 { "mpegts_start_pid", "Set the first pid.",
91 offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.dbl = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
92 {"mpegts_m2ts_mode", "Enable m2ts mode.",
93 offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.dbl = -1 },
94 -1,1, AV_OPT_FLAG_ENCODING_PARAM},
98 static const AVClass mpegts_muxer_class = {
99 .class_name = "MPEGTS muxer",
100 .item_name = av_default_item_name,
102 .version = LIBAVUTIL_VERSION_INT,
105 /* NOTE: 4 bytes must be left at the end for the crc32 */
106 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
109 unsigned char packet[TS_PACKET_SIZE];
110 const unsigned char *buf_ptr;
112 int first, b, len1, left;
114 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
115 buf[len - 4] = (crc >> 24) & 0xff;
116 buf[len - 3] = (crc >> 16) & 0xff;
117 buf[len - 2] = (crc >> 8) & 0xff;
118 buf[len - 1] = (crc) & 0xff;
120 /* send each packet */
123 first = (buf == buf_ptr);
131 s->cc = (s->cc + 1) & 0xf;
134 *q++ = 0; /* 0 offset */
135 len1 = TS_PACKET_SIZE - (q - packet);
138 memcpy(q, buf_ptr, len1);
140 /* add known padding data */
141 left = TS_PACKET_SIZE - (q - packet);
143 memset(q, 0xff, left);
145 s->write_packet(s, packet);
152 static inline void put16(uint8_t **q_ptr, int val)
161 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
162 int version, int sec_num, int last_sec_num,
163 uint8_t *buf, int len)
165 uint8_t section[1024], *q;
166 unsigned int tot_len;
167 /* reserved_future_use field must be set to 1 for SDT */
168 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
170 tot_len = 3 + 5 + len + 4;
171 /* check if not too big */
177 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
179 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
184 mpegts_write_section(s, section, tot_len);
188 /*********************************************/
191 #define DEFAULT_PROVIDER_NAME "FFmpeg"
192 #define DEFAULT_SERVICE_NAME "Service01"
194 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
195 #define DEFAULT_PES_HEADER_FREQ 16
196 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
198 /* we retransmit the SI info at this rate */
199 #define SDT_RETRANS_TIME 500
200 #define PAT_RETRANS_TIME 100
201 #define PCR_RETRANS_TIME 20
203 typedef struct MpegTSWriteStream {
204 struct MpegTSService *service;
205 int pid; /* stream associated pid */
208 int first_pts_check; ///< first pts check needed
212 uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
216 static void mpegts_write_pat(AVFormatContext *s)
218 MpegTSWrite *ts = s->priv_data;
219 MpegTSService *service;
220 uint8_t data[1012], *q;
224 for(i = 0; i < ts->nb_services; i++) {
225 service = ts->services[i];
226 put16(&q, service->sid);
227 put16(&q, 0xe000 | service->pmt.pid);
229 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
233 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
235 // MpegTSWrite *ts = s->priv_data;
236 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
237 int val, stream_type, i;
240 put16(&q, 0xe000 | service->pcr_pid);
242 program_info_length_ptr = q;
243 q += 2; /* patched after */
245 /* put program info here */
247 val = 0xf000 | (q - program_info_length_ptr - 2);
248 program_info_length_ptr[0] = val >> 8;
249 program_info_length_ptr[1] = val;
251 for(i = 0; i < s->nb_streams; i++) {
252 AVStream *st = s->streams[i];
253 MpegTSWriteStream *ts_st = st->priv_data;
254 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
255 switch(st->codec->codec_id) {
256 case CODEC_ID_MPEG1VIDEO:
257 case CODEC_ID_MPEG2VIDEO:
258 stream_type = STREAM_TYPE_VIDEO_MPEG2;
261 stream_type = STREAM_TYPE_VIDEO_MPEG4;
264 stream_type = STREAM_TYPE_VIDEO_H264;
267 stream_type = STREAM_TYPE_VIDEO_DIRAC;
271 stream_type = STREAM_TYPE_AUDIO_MPEG1;
274 stream_type = STREAM_TYPE_AUDIO_AAC;
276 case CODEC_ID_AAC_LATM:
277 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
280 stream_type = STREAM_TYPE_AUDIO_AC3;
283 stream_type = STREAM_TYPE_PRIVATE_DATA;
287 put16(&q, 0xe000 | ts_st->pid);
289 q += 2; /* patched after */
291 /* write optional descriptors here */
292 switch(st->codec->codec_type) {
293 case AVMEDIA_TYPE_AUDIO:
296 char *next = lang->value;
299 *q++ = 0x0a; /* ISO 639 language descriptor */
303 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
304 next = strchr(p, ',');
305 if (strlen(p) != 3 && (!next || next != p + 3))
306 continue; /* not a 3-letter code */
312 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
314 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
316 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
319 *q++ = 0; /* undefined type */
325 q -= 2; /* no language codes were written */
328 case AVMEDIA_TYPE_SUBTITLE:
330 const char *language;
331 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
337 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
338 if(st->codec->extradata_size == 4) {
339 memcpy(q, st->codec->extradata, 4);
342 put16(&q, 1); /* page id */
343 put16(&q, 1); /* ancillary page id */
347 case AVMEDIA_TYPE_VIDEO:
348 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
349 *q++ = 0x05; /*MPEG-2 registration descriptor*/
359 val = 0xf000 | (q - desc_length_ptr - 2);
360 desc_length_ptr[0] = val >> 8;
361 desc_length_ptr[1] = val;
363 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
367 /* NOTE: str == NULL is accepted for an empty string */
368 static void putstr8(uint8_t **q_ptr, const char *str)
384 static void mpegts_write_sdt(AVFormatContext *s)
386 MpegTSWrite *ts = s->priv_data;
387 MpegTSService *service;
388 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
389 int i, running_status, free_ca_mode, val;
394 for(i = 0; i < ts->nb_services; i++) {
395 service = ts->services[i];
396 put16(&q, service->sid);
397 *q++ = 0xfc | 0x00; /* currently no EIT info */
398 desc_list_len_ptr = q;
400 running_status = 4; /* running */
403 /* write only one descriptor for the service name and provider */
407 *q++ = 0x01; /* digital television service */
408 putstr8(&q, service->provider_name);
409 putstr8(&q, service->name);
410 desc_len_ptr[0] = q - desc_len_ptr - 1;
412 /* fill descriptor length */
413 val = (running_status << 13) | (free_ca_mode << 12) |
414 (q - desc_list_len_ptr - 2);
415 desc_list_len_ptr[0] = val >> 8;
416 desc_list_len_ptr[1] = val;
418 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
422 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
424 const char *provider_name,
427 MpegTSService *service;
429 service = av_mallocz(sizeof(MpegTSService));
432 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
434 service->provider_name = av_strdup(provider_name);
435 service->name = av_strdup(name);
436 service->pcr_pid = 0x1fff;
437 dynarray_add(&ts->services, &ts->nb_services, service);
441 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
443 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
447 static void mpegts_prefix_m2ts_header(AVFormatContext *s)
449 MpegTSWrite *ts = s->priv_data;
451 int64_t pcr = get_pcr(s->priv_data, s->pb);
452 uint32_t tp_extra_header = pcr % 0x3fffffff;
453 tp_extra_header = AV_RB32(&tp_extra_header);
454 avio_write(s->pb, (unsigned char *) &tp_extra_header,
455 sizeof(tp_extra_header));
459 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
461 AVFormatContext *ctx = s->opaque;
462 mpegts_prefix_m2ts_header(ctx);
463 avio_write(ctx->pb, packet, TS_PACKET_SIZE);
466 static int mpegts_write_header(AVFormatContext *s)
468 MpegTSWrite *ts = s->priv_data;
469 MpegTSWriteStream *ts_st;
470 MpegTSService *service;
471 AVStream *st, *pcr_st = NULL;
472 AVDictionaryEntry *title, *provider;
474 const char *service_name;
475 const char *provider_name;
478 ts->tsid = ts->transport_stream_id;
479 ts->onid = ts->original_network_id;
480 /* allocate a single DVB service */
481 title = av_dict_get(s->metadata, "service_name", NULL, 0);
483 title = av_dict_get(s->metadata, "title", NULL, 0);
484 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
485 provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
486 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
487 service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
488 service->pmt.write_packet = section_write_packet;
489 service->pmt.opaque = s;
490 service->pmt.cc = 15;
492 ts->pat.pid = PAT_PID;
493 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
494 ts->pat.write_packet = section_write_packet;
497 ts->sdt.pid = SDT_PID;
499 ts->sdt.write_packet = section_write_packet;
502 pids = av_malloc(s->nb_streams * sizeof(*pids));
504 return AVERROR(ENOMEM);
506 /* assign pids to each stream */
507 for(i = 0;i < s->nb_streams; i++) {
509 av_set_pts_info(st, 33, 1, 90000);
510 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
513 st->priv_data = ts_st;
514 ts_st->service = service;
515 /* MPEG pid values < 16 are reserved. Applications which set st->id in
516 * this range are assigned a calculated pid. */
518 ts_st->pid = ts->start_pid + i;
519 } else if (st->id < 0x1FFF) {
522 av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
525 if (ts_st->pid == service->pmt.pid) {
526 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
529 for (j = 0; j < i; j++)
530 if (pids[j] == ts_st->pid) {
531 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
534 pids[i] = ts_st->pid;
535 ts_st->payload_pts = AV_NOPTS_VALUE;
536 ts_st->payload_dts = AV_NOPTS_VALUE;
537 ts_st->first_pts_check = 1;
539 /* update PCR pid by using the first video stream */
540 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
541 service->pcr_pid == 0x1fff) {
542 service->pcr_pid = ts_st->pid;
545 if (st->codec->codec_id == CODEC_ID_AAC &&
546 st->codec->extradata_size > 0) {
547 ts_st->adts = av_mallocz(sizeof(*ts_st->adts));
549 return AVERROR(ENOMEM);
550 if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata,
551 st->codec->extradata_size) < 0)
558 /* if no video stream, use the first stream as PCR */
559 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
560 pcr_st = s->streams[0];
561 ts_st = pcr_st->priv_data;
562 service->pcr_pid = ts_st->pid;
565 ts->mux_rate = s->mux_rate ? s->mux_rate : 1;
567 if (ts->mux_rate > 1) {
568 service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
569 (TS_PACKET_SIZE * 8 * 1000);
570 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
571 (TS_PACKET_SIZE * 8 * 1000);
572 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
573 (TS_PACKET_SIZE * 8 * 1000);
575 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
577 /* Arbitrary values, PAT/PMT could be written on key frames */
578 ts->sdt_packet_period = 200;
579 ts->pat_packet_period = 40;
580 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
581 if (!pcr_st->codec->frame_size) {
582 av_log(s, AV_LOG_WARNING, "frame size not set\n");
583 service->pcr_packet_period =
584 pcr_st->codec->sample_rate/(10*512);
586 service->pcr_packet_period =
587 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
590 // max delta PCR 0.1s
591 service->pcr_packet_period =
592 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
596 // output a PCR as soon as possible
597 service->pcr_packet_count = service->pcr_packet_period;
598 ts->pat_packet_count = ts->pat_packet_period-1;
599 ts->sdt_packet_count = ts->sdt_packet_period-1;
601 if (ts->mux_rate == 1)
602 av_log(s, AV_LOG_INFO, "muxrate VBR, ");
604 av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);
605 av_log(s, AV_LOG_INFO, "pcr every %d pkts, "
606 "sdt every %d, pat/pmt every %d pkts\n",
607 service->pcr_packet_period,
608 ts->sdt_packet_period, ts->pat_packet_period);
610 if (ts->m2ts_mode == -1) {
611 if (av_match_ext(s->filename, "m2ts")) {
624 for(i = 0;i < s->nb_streams; i++) {
626 av_freep(&st->priv_data);
631 /* send SDT, PAT and PMT tables regulary */
632 static void retransmit_si_info(AVFormatContext *s)
634 MpegTSWrite *ts = s->priv_data;
637 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
638 ts->sdt_packet_count = 0;
641 if (++ts->pat_packet_count == ts->pat_packet_period) {
642 ts->pat_packet_count = 0;
644 for(i = 0; i < ts->nb_services; i++) {
645 mpegts_write_pmt(s, ts->services[i]);
650 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
652 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
654 *buf++ = pcr_high >> 25;
655 *buf++ = pcr_high >> 17;
656 *buf++ = pcr_high >> 9;
657 *buf++ = pcr_high >> 1;
658 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
664 /* Write a single null transport stream packet */
665 static void mpegts_insert_null_packet(AVFormatContext *s)
668 uint8_t buf[TS_PACKET_SIZE];
675 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
676 mpegts_prefix_m2ts_header(s);
677 avio_write(s->pb, buf, TS_PACKET_SIZE);
680 /* Write a single transport stream packet with a PCR and no payload */
681 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
683 MpegTSWrite *ts = s->priv_data;
684 MpegTSWriteStream *ts_st = st->priv_data;
686 uint8_t buf[TS_PACKET_SIZE];
690 *q++ = ts_st->pid >> 8;
692 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
693 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
694 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
695 *q++ = 0x10; /* Adaptation flags: PCR present */
697 /* PCR coded into 6 bytes */
698 q += write_pcr_bits(q, get_pcr(ts, s->pb));
701 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
702 mpegts_prefix_m2ts_header(s);
703 avio_write(s->pb, buf, TS_PACKET_SIZE);
706 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
710 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
712 val = (((pts >> 15) & 0x7fff) << 1) | 1;
715 val = (((pts) & 0x7fff) << 1) | 1;
720 /* Set an adaptation field flag in an MPEG-TS packet*/
721 static void set_af_flag(uint8_t *pkt, int flag)
723 // expect at least one flag to set
726 if ((pkt[3] & 0x20) == 0) {
727 // no AF yet, set adaptation field flag
729 // 1 byte length, no flags
736 /* Extend the adaptation field by size bytes */
737 static void extend_af(uint8_t *pkt, int size)
739 // expect already existing adaptation field
740 assert(pkt[3] & 0x20);
744 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
745 static uint8_t *get_ts_payload_start(uint8_t *pkt)
748 return pkt + 5 + pkt[4];
753 /* Add a pes header to the front of payload, and segment into an integer number of
754 * ts packets. The final ts packet is padded using an over-sized adaptation header
755 * to exactly fill the last ts packet.
756 * NOTE: 'payload' contains a complete PES payload.
758 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
759 const uint8_t *payload, int payload_size,
760 int64_t pts, int64_t dts, int key)
762 MpegTSWriteStream *ts_st = st->priv_data;
763 MpegTSWrite *ts = s->priv_data;
764 uint8_t buf[TS_PACKET_SIZE];
766 int val, is_start, len, header_len, write_pcr, private_code, flags;
767 int afc_len, stuffing_len;
768 int64_t pcr = -1; /* avoid warning */
769 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
772 while (payload_size > 0) {
773 retransmit_si_info(s);
776 if (ts_st->pid == ts_st->service->pcr_pid) {
777 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
778 ts_st->service->pcr_packet_count++;
779 if (ts_st->service->pcr_packet_count >=
780 ts_st->service->pcr_packet_period) {
781 ts_st->service->pcr_packet_count = 0;
786 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
787 (dts - get_pcr(ts, s->pb)/300) > delay) {
788 /* pcr insert gets priority over null packet insert */
790 mpegts_insert_pcr_only(s, st);
792 mpegts_insert_null_packet(s);
793 continue; /* recalculate write_pcr and possibly retransmit si_info */
796 /* prepare packet header */
799 val = (ts_st->pid >> 8);
804 ts_st->cc = (ts_st->cc + 1) & 0xf;
805 *q++ = 0x10 | ts_st->cc; // payload indicator + CC
806 if (key && is_start && pts != AV_NOPTS_VALUE) {
807 // set Random Access for key frames
808 if (ts_st->pid == ts_st->service->pcr_pid)
810 set_af_flag(buf, 0x40);
811 q = get_ts_payload_start(buf);
814 set_af_flag(buf, 0x10);
815 q = get_ts_payload_start(buf);
816 // add 11, pcr references the last byte of program clock reference base
817 if (ts->mux_rate > 1)
818 pcr = get_pcr(ts, s->pb);
820 pcr = (dts - delay)*300;
821 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
822 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
823 extend_af(buf, write_pcr_bits(q, pcr));
824 q = get_ts_payload_start(buf);
827 int pes_extension = 0;
828 /* write PES header */
833 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
834 if (st->codec->codec_id == CODEC_ID_DIRAC) {
838 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
839 (st->codec->codec_id == CODEC_ID_MP2 ||
840 st->codec->codec_id == CODEC_ID_MP3 ||
841 st->codec->codec_id == CODEC_ID_AAC)) {
845 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
851 if (pts != AV_NOPTS_VALUE) {
855 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
859 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
860 st->codec->codec_id == CODEC_ID_DIRAC) {
861 /* set PES_extension_flag */
866 * One byte for PES2 extension flag +
867 * one byte for extension length +
868 * one byte for extension id
872 len = payload_size + header_len + 3;
873 if (private_code != 0)
880 /* data alignment indicator is required for subtitle data */
881 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
886 if (pts != AV_NOPTS_VALUE) {
887 write_pts(q, flags >> 6, pts);
890 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
891 write_pts(q, 1, dts);
894 if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
895 flags = 0x01; /* set PES_extension_flag_2 */
897 *q++ = 0x80 | 0x01; /* marker bit + extension length */
899 * Set the stream id extension flag bit to 0 and
900 * write the extended stream id
904 if (private_code != 0)
909 header_len = q - buf;
911 len = TS_PACKET_SIZE - header_len;
912 if (len > payload_size)
914 stuffing_len = TS_PACKET_SIZE - header_len - len;
915 if (stuffing_len > 0) {
916 /* add stuffing with AFC */
918 /* stuffing already present: increase its size */
919 afc_len = buf[4] + 1;
920 memmove(buf + 4 + afc_len + stuffing_len,
922 header_len - (4 + afc_len));
923 buf[4] += stuffing_len;
924 memset(buf + 4 + afc_len, 0xff, stuffing_len);
927 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
929 buf[4] = stuffing_len - 1;
930 if (stuffing_len >= 2) {
932 memset(buf + 6, 0xff, stuffing_len - 2);
936 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
939 mpegts_prefix_m2ts_header(s);
940 avio_write(s->pb, buf, TS_PACKET_SIZE);
945 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
947 AVStream *st = s->streams[pkt->stream_index];
948 int size = pkt->size;
949 uint8_t *buf= pkt->data;
951 MpegTSWriteStream *ts_st = st->priv_data;
952 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
953 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
955 if (pkt->pts != AV_NOPTS_VALUE)
956 pts = pkt->pts + delay;
957 if (pkt->dts != AV_NOPTS_VALUE)
958 dts = pkt->dts + delay;
960 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
961 av_log(s, AV_LOG_ERROR, "first pts value must set\n");
964 ts_st->first_pts_check = 0;
966 if (st->codec->codec_id == CODEC_ID_H264) {
967 const uint8_t *p = buf, *buf_end = p+size;
970 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
971 av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, "
972 "no startcode found, use -vbsf h264_mp4toannexb\n");
977 p = ff_find_start_code(p, buf_end, &state);
978 //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);
979 } while (p < buf_end && (state & 0x1f) != 9 &&
980 (state & 0x1f) != 5 && (state & 0x1f) != 1);
982 if ((state & 0x1f) != 9) { // AUD NAL
983 data = av_malloc(pkt->size+6);
986 memcpy(data+6, pkt->data, pkt->size);
987 AV_WB32(data, 0x00000001);
989 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
993 } else if (st->codec->codec_id == CODEC_ID_AAC) {
996 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
997 ADTSContext *adts = ts_st->adts;
1000 av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "
1001 "and extradata missing\n");
1004 new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;
1005 if ((unsigned)new_size >= INT_MAX)
1007 data = av_malloc(new_size);
1009 return AVERROR(ENOMEM);
1010 ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size);
1011 if (adts->pce_size) {
1012 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);
1015 memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);
1021 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
1022 // for video and subtitle, write a single pes packet
1023 mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);
1028 if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {
1029 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
1030 ts_st->payload_pts, ts_st->payload_dts,
1031 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1032 ts_st->payload_index = 0;
1035 if (!ts_st->payload_index) {
1036 ts_st->payload_pts = pts;
1037 ts_st->payload_dts = dts;
1038 ts_st->payload_flags = pkt->flags;
1041 memcpy(ts_st->payload + ts_st->payload_index, buf, size);
1042 ts_st->payload_index += size;
1049 static int mpegts_write_end(AVFormatContext *s)
1051 MpegTSWrite *ts = s->priv_data;
1052 MpegTSWriteStream *ts_st;
1053 MpegTSService *service;
1057 /* flush current packets */
1058 for(i = 0; i < s->nb_streams; i++) {
1060 ts_st = st->priv_data;
1061 if (ts_st->payload_index > 0) {
1062 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
1063 ts_st->payload_pts, ts_st->payload_dts,
1064 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1066 av_freep(&ts_st->adts);
1070 for(i = 0; i < ts->nb_services; i++) {
1071 service = ts->services[i];
1072 av_freep(&service->provider_name);
1073 av_freep(&service->name);
1076 av_free(ts->services);
1081 AVOutputFormat ff_mpegts_muxer = {
1083 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1084 .mime_type = "video/x-mpegts",
1085 .extensions = "ts,m2t,m2ts",
1086 .priv_data_size = sizeof(MpegTSWrite),
1087 .audio_codec = CODEC_ID_MP2,
1088 .video_codec = CODEC_ID_MPEG2VIDEO,
1089 .write_header = mpegts_write_header,
1090 .write_packet = mpegts_write_packet,
1091 .write_trailer = mpegts_write_end,
1092 .priv_class = &mpegts_muxer_class,