2 * MPEG2 transport stream (aka DVB) muxer
3 * Copyright (c) 2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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/intreadwrite.h"
26 #include "libavutil/mathematics.h"
27 #include "libavutil/opt.h"
29 #include "libavcodec/internal.h"
35 #define PCR_TIME_BASE 27000000
37 /* write DVB SI sections */
39 /*********************************************/
40 /* mpegts section writer */
42 typedef struct MpegTSSection {
45 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
49 typedef struct MpegTSService {
50 MpegTSSection pmt; /* MPEG2 pmt table context */
51 int sid; /* service ID */
56 int pcr_packet_period;
59 typedef struct MpegTSWrite {
60 const AVClass *av_class;
61 MpegTSSection pat; /* MPEG2 pat table */
62 MpegTSSection sdt; /* MPEG2 sdt table context */
63 MpegTSService **services;
65 int sdt_packet_period;
67 int pat_packet_period;
72 int mux_rate; ///< set to 1 when VBR
75 int transport_stream_id;
76 int original_network_id;
83 int reemit_pat_pmt; // backward compatibility
86 #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
87 #define MPEGTS_FLAG_AAC_LATM 0x02
91 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
92 #define DEFAULT_PES_HEADER_FREQ 16
93 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
95 /* The section length is 12 bits. The first 2 are set to 0, the remaining
96 * 10 bits should not exceed 1021. */
97 #define SECTION_LENGTH 1020
99 /* NOTE: 4 bytes must be left at the end for the crc32 */
100 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
103 unsigned char packet[TS_PACKET_SIZE];
104 const unsigned char *buf_ptr;
106 int first, b, len1, left;
108 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE),
111 buf[len - 4] = (crc >> 24) & 0xff;
112 buf[len - 3] = (crc >> 16) & 0xff;
113 buf[len - 2] = (crc >> 8) & 0xff;
114 buf[len - 1] = crc & 0xff;
116 /* send each packet */
119 first = buf == buf_ptr;
127 s->cc = s->cc + 1 & 0xf;
130 *q++ = 0; /* 0 offset */
131 len1 = TS_PACKET_SIZE - (q - packet);
134 memcpy(q, buf_ptr, len1);
136 /* add known padding data */
137 left = TS_PACKET_SIZE - (q - packet);
139 memset(q, 0xff, left);
141 s->write_packet(s, packet);
148 static inline void put16(uint8_t **q_ptr, int val)
157 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
158 int version, int sec_num, int last_sec_num,
159 uint8_t *buf, int len)
161 uint8_t section[1024], *q;
162 unsigned int tot_len;
163 /* reserved_future_use field must be set to 1 for SDT */
164 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
166 tot_len = 3 + 5 + len + 4;
167 /* check if not too big */
169 return AVERROR_INVALIDDATA;
173 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
175 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
180 mpegts_write_section(s, section, tot_len);
184 /*********************************************/
187 #define DEFAULT_PROVIDER_NAME "Libav"
188 #define DEFAULT_SERVICE_NAME "Service01"
190 /* we retransmit the SI info at this rate */
191 #define SDT_RETRANS_TIME 500
192 #define PAT_RETRANS_TIME 100
193 #define PCR_RETRANS_TIME 20
195 typedef struct MpegTSWriteStream {
196 struct MpegTSService *service;
197 int pid; /* stream associated pid */
200 int first_pts_check; ///< first pts check needed
205 AVFormatContext *amux;
209 static void mpegts_write_pat(AVFormatContext *s)
211 MpegTSWrite *ts = s->priv_data;
212 MpegTSService *service;
213 uint8_t data[SECTION_LENGTH], *q;
217 for (i = 0; i < ts->nb_services; i++) {
218 service = ts->services[i];
219 put16(&q, service->sid);
220 put16(&q, 0xe000 | service->pmt.pid);
222 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
226 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
228 MpegTSWrite *ts = s->priv_data;
229 uint8_t data[SECTION_LENGTH], *q, *desc_length_ptr, *program_info_length_ptr;
230 int val, stream_type, i, err = 0;
233 put16(&q, 0xe000 | service->pcr_pid);
235 program_info_length_ptr = q;
236 q += 2; /* patched after */
238 /* put program info here */
240 val = 0xf000 | (q - program_info_length_ptr - 2);
241 program_info_length_ptr[0] = val >> 8;
242 program_info_length_ptr[1] = val;
244 for (i = 0; i < s->nb_streams; i++) {
245 AVStream *st = s->streams[i];
246 MpegTSWriteStream *ts_st = st->priv_data;
247 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL, 0);
249 if (q - data > SECTION_LENGTH - 3 - 2 - 6) {
253 switch (st->codec->codec_id) {
254 case AV_CODEC_ID_MPEG1VIDEO:
255 case AV_CODEC_ID_MPEG2VIDEO:
256 stream_type = STREAM_TYPE_VIDEO_MPEG2;
258 case AV_CODEC_ID_MPEG4:
259 stream_type = STREAM_TYPE_VIDEO_MPEG4;
261 case AV_CODEC_ID_H264:
262 stream_type = STREAM_TYPE_VIDEO_H264;
264 case AV_CODEC_ID_HEVC:
265 stream_type = STREAM_TYPE_VIDEO_HEVC;
267 case AV_CODEC_ID_CAVS:
268 stream_type = STREAM_TYPE_VIDEO_CAVS;
270 case AV_CODEC_ID_DIRAC:
271 stream_type = STREAM_TYPE_VIDEO_DIRAC;
273 case AV_CODEC_ID_MP2:
274 case AV_CODEC_ID_MP3:
275 stream_type = STREAM_TYPE_AUDIO_MPEG1;
277 case AV_CODEC_ID_AAC:
278 stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM)
279 ? STREAM_TYPE_AUDIO_AAC_LATM
280 : STREAM_TYPE_AUDIO_AAC;
282 case AV_CODEC_ID_AAC_LATM:
283 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
285 case AV_CODEC_ID_AC3:
286 stream_type = STREAM_TYPE_AUDIO_AC3;
289 stream_type = STREAM_TYPE_PRIVATE_DATA;
293 put16(&q, 0xe000 | ts_st->pid);
295 q += 2; /* patched after */
297 /* write optional descriptors here */
298 switch (st->codec->codec_type) {
299 case AVMEDIA_TYPE_AUDIO:
302 char *next = lang->value;
305 *q++ = 0x0a; /* ISO 639 language descriptor */
309 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
310 if (q - data > SECTION_LENGTH - 4) {
314 next = strchr(p, ',');
315 if (strlen(p) != 3 && (!next || next != p + 3))
316 continue; /* not a 3-letter code */
322 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
324 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
326 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
329 *q++ = 0; /* undefined type */
335 q -= 2; /* no language codes were written */
338 case AVMEDIA_TYPE_SUBTITLE:
340 const char *language;
341 language = lang && strlen(lang->value) == 3 ? lang->value : "eng";
347 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
349 if (q - data > SECTION_LENGTH - 4) {
354 if (st->codec->extradata_size == 4) {
355 memcpy(q, st->codec->extradata, 4);
358 put16(&q, 1); /* page id */
359 put16(&q, 1); /* ancillary page id */
363 case AVMEDIA_TYPE_VIDEO:
364 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
365 *q++ = 0x05; /*MPEG-2 registration descriptor*/
375 val = 0xf000 | (q - desc_length_ptr - 2);
376 desc_length_ptr[0] = val >> 8;
377 desc_length_ptr[1] = val;
381 av_log(s, AV_LOG_ERROR,
382 "The PMT section cannot fit stream %d and all following streams.\n"
383 "Try reducing the number of languages in the audio streams "
384 "or the total number of streams.\n", i);
386 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
390 /* NOTE: str == NULL is accepted for an empty string */
391 static void putstr8(uint8_t **q_ptr, const char *str)
407 static void mpegts_write_sdt(AVFormatContext *s)
409 MpegTSWrite *ts = s->priv_data;
410 MpegTSService *service;
411 uint8_t data[SECTION_LENGTH], *q, *desc_list_len_ptr, *desc_len_ptr;
412 int i, running_status, free_ca_mode, val;
417 for (i = 0; i < ts->nb_services; i++) {
418 service = ts->services[i];
419 put16(&q, service->sid);
420 *q++ = 0xfc | 0x00; /* currently no EIT info */
421 desc_list_len_ptr = q;
423 running_status = 4; /* running */
426 /* write only one descriptor for the service name and provider */
430 *q++ = 0x01; /* digital television service */
431 putstr8(&q, service->provider_name);
432 putstr8(&q, service->name);
433 desc_len_ptr[0] = q - desc_len_ptr - 1;
435 /* fill descriptor length */
436 val = (running_status << 13) | (free_ca_mode << 12) |
437 (q - desc_list_len_ptr - 2);
438 desc_list_len_ptr[0] = val >> 8;
439 desc_list_len_ptr[1] = val;
441 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
445 static MpegTSService *mpegts_add_service(MpegTSWrite *ts, int sid,
446 const char *provider_name,
449 MpegTSService *service;
451 service = av_mallocz(sizeof(MpegTSService));
454 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
456 service->pcr_pid = 0x1fff;
457 service->provider_name = av_strdup(provider_name);
458 service->name = av_strdup(name);
459 if (!service->provider_name || !service->name) {
460 av_free(service->provider_name);
461 av_free(service->name);
465 dynarray_add(&ts->services, &ts->nb_services, service);
469 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
471 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
475 static void mpegts_prefix_m2ts_header(AVFormatContext *s)
477 MpegTSWrite *ts = s->priv_data;
479 int64_t pcr = get_pcr(s->priv_data, s->pb);
480 uint32_t tp_extra_header = pcr % 0x3fffffff;
481 tp_extra_header = AV_RB32(&tp_extra_header);
482 avio_write(s->pb, (unsigned char *) &tp_extra_header,
483 sizeof(tp_extra_header));
487 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
489 AVFormatContext *ctx = s->opaque;
490 mpegts_prefix_m2ts_header(ctx);
491 avio_write(ctx->pb, packet, TS_PACKET_SIZE);
494 static int mpegts_write_header(AVFormatContext *s)
496 MpegTSWrite *ts = s->priv_data;
497 MpegTSWriteStream *ts_st;
498 MpegTSService *service;
499 AVStream *st, *pcr_st = NULL;
500 AVDictionaryEntry *title, *provider;
502 const char *service_name;
503 const char *provider_name;
507 if (s->max_delay < 0) /* Not set by the caller */
510 // round up to a whole number of TS packets
511 ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
513 ts->tsid = ts->transport_stream_id;
514 ts->onid = ts->original_network_id;
515 /* allocate a single DVB service */
516 title = av_dict_get(s->metadata, "service_name", NULL, 0);
518 title = av_dict_get(s->metadata, "title", NULL, 0);
519 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
520 provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
521 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
522 service = mpegts_add_service(ts, ts->service_id,
523 provider_name, service_name);
526 return AVERROR(ENOMEM);
528 service->pmt.write_packet = section_write_packet;
529 service->pmt.opaque = s;
530 service->pmt.cc = 15;
532 ts->pat.pid = PAT_PID;
533 /* Initialize at 15 so that it wraps and is equal to 0 for the
534 * first packet we write. */
536 ts->pat.write_packet = section_write_packet;
539 ts->sdt.pid = SDT_PID;
541 ts->sdt.write_packet = section_write_packet;
544 pids = av_malloc(s->nb_streams * sizeof(*pids));
547 return AVERROR(ENOMEM);
550 /* assign pids to each stream */
551 for (i = 0; i < s->nb_streams; i++) {
554 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
556 ret = AVERROR(ENOMEM);
559 st->priv_data = ts_st;
561 ts_st->user_tb = st->time_base;
562 avpriv_set_pts_info(st, 33, 1, 90000);
564 ts_st->payload = av_mallocz(ts->pes_payload_size);
565 if (!ts_st->payload) {
566 ret = AVERROR(ENOMEM);
569 ts_st->service = service;
570 /* MPEG pid values < 16 are reserved. Applications which set st->id in
571 * this range are assigned a calculated pid. */
573 ts_st->pid = ts->start_pid + i;
574 } else if (st->id < 0x1FFF) {
577 av_log(s, AV_LOG_ERROR,
578 "Invalid stream id %d, must be less than 8191\n", st->id);
579 ret = AVERROR(EINVAL);
582 if (ts_st->pid == service->pmt.pid) {
583 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
584 ret = AVERROR(EINVAL);
587 for (j = 0; j < i; j++) {
588 if (pids[j] == ts_st->pid) {
589 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
590 ret = AVERROR(EINVAL);
594 pids[i] = ts_st->pid;
595 ts_st->payload_pts = AV_NOPTS_VALUE;
596 ts_st->payload_dts = AV_NOPTS_VALUE;
597 ts_st->first_pts_check = 1;
599 /* update PCR pid by using the first video stream */
600 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
601 service->pcr_pid == 0x1fff) {
602 service->pcr_pid = ts_st->pid;
605 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
606 st->codec->extradata_size > 0) {
608 ts_st->amux = avformat_alloc_context();
610 ret = AVERROR(ENOMEM);
613 ts_st->amux->oformat =
614 av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts",
616 if (!ts_st->amux->oformat) {
617 ret = AVERROR(EINVAL);
620 if (!(ast = avformat_new_stream(ts_st->amux, NULL))) {
621 ret = AVERROR(ENOMEM);
624 ret = avcodec_copy_context(ast->codec, st->codec);
627 ast->time_base = st->time_base;
628 ret = avformat_write_header(ts_st->amux, NULL);
636 /* if no video stream, use the first stream as PCR */
637 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
638 pcr_st = s->streams[0];
639 ts_st = pcr_st->priv_data;
640 service->pcr_pid = ts_st->pid;
642 ts_st = pcr_st->priv_data;
644 if (ts->mux_rate > 1) {
645 service->pcr_packet_period = (ts->mux_rate * ts->pcr_period) /
646 (TS_PACKET_SIZE * 8 * 1000);
647 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
648 (TS_PACKET_SIZE * 8 * 1000);
649 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
650 (TS_PACKET_SIZE * 8 * 1000);
652 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
654 /* Arbitrary values, PAT/PMT could be written on key frames */
655 ts->sdt_packet_period = 200;
656 ts->pat_packet_period = 40;
657 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
658 if (!pcr_st->codec->frame_size) {
659 av_log(s, AV_LOG_WARNING, "frame size not set\n");
660 service->pcr_packet_period =
661 pcr_st->codec->sample_rate / (10 * 512);
663 service->pcr_packet_period =
664 pcr_st->codec->sample_rate / (10 * pcr_st->codec->frame_size);
667 // max delta PCR 0.1s
668 // TODO: should be avg_frame_rate
669 service->pcr_packet_period =
670 ts_st->user_tb.den / (10 * ts_st->user_tb.num);
674 // output a PCR as soon as possible
675 service->pcr_packet_count = service->pcr_packet_period;
676 ts->pat_packet_count = ts->pat_packet_period - 1;
677 ts->sdt_packet_count = ts->sdt_packet_period - 1;
679 if (ts->mux_rate == 1)
680 av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
682 av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
683 av_log(s, AV_LOG_VERBOSE,
684 "pcr every %d pkts, sdt every %d, pat/pmt every %d pkts\n",
685 service->pcr_packet_period,
686 ts->sdt_packet_period, ts->pat_packet_period);
688 if (ts->m2ts_mode == -1) {
689 if (av_match_ext(s->filename, "m2ts")) {
703 for (i = 0; i < s->nb_streams; i++) {
705 ts_st = st->priv_data;
707 av_freep(&ts_st->payload);
709 avformat_free_context(ts_st->amux);
713 av_freep(&st->priv_data);
718 /* send SDT, PAT and PMT tables regulary */
719 static void retransmit_si_info(AVFormatContext *s)
721 MpegTSWrite *ts = s->priv_data;
724 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
725 ts->sdt_packet_count = 0;
728 if (++ts->pat_packet_count == ts->pat_packet_period) {
729 ts->pat_packet_count = 0;
731 for (i = 0; i < ts->nb_services; i++)
732 mpegts_write_pmt(s, ts->services[i]);
736 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
738 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
740 *buf++ = pcr_high >> 25;
741 *buf++ = pcr_high >> 17;
742 *buf++ = pcr_high >> 9;
743 *buf++ = pcr_high >> 1;
744 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
750 /* Write a single null transport stream packet */
751 static void mpegts_insert_null_packet(AVFormatContext *s)
754 uint8_t buf[TS_PACKET_SIZE];
761 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
762 mpegts_prefix_m2ts_header(s);
763 avio_write(s->pb, buf, TS_PACKET_SIZE);
766 /* Write a single transport stream packet with a PCR and no payload */
767 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
769 MpegTSWrite *ts = s->priv_data;
770 MpegTSWriteStream *ts_st = st->priv_data;
772 uint8_t buf[TS_PACKET_SIZE];
776 *q++ = ts_st->pid >> 8;
778 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
779 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
780 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
781 *q++ = 0x10; /* Adaptation flags: PCR present */
783 /* PCR coded into 6 bytes */
784 q += write_pcr_bits(q, get_pcr(ts, s->pb));
787 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
788 mpegts_prefix_m2ts_header(s);
789 avio_write(s->pb, buf, TS_PACKET_SIZE);
792 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
796 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
798 val = (((pts >> 15) & 0x7fff) << 1) | 1;
801 val = (((pts) & 0x7fff) << 1) | 1;
806 /* Set an adaptation field flag in an MPEG-TS packet*/
807 static void set_af_flag(uint8_t *pkt, int flag)
809 // expect at least one flag to set
812 if ((pkt[3] & 0x20) == 0) {
813 // no AF yet, set adaptation field flag
815 // 1 byte length, no flags
822 /* Extend the adaptation field by size bytes */
823 static void extend_af(uint8_t *pkt, int size)
825 // expect already existing adaptation field
826 assert(pkt[3] & 0x20);
830 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
831 static uint8_t *get_ts_payload_start(uint8_t *pkt)
834 return pkt + 5 + pkt[4];
839 /* Add a PES header to the front of the payload, and segment into an integer
840 * number of TS packets. The final TS packet is padded using an oversized
841 * adaptation header to exactly fill the last TS packet.
842 * NOTE: 'payload' contains a complete PES payload. */
843 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
844 const uint8_t *payload, int payload_size,
845 int64_t pts, int64_t dts, int key)
847 MpegTSWriteStream *ts_st = st->priv_data;
848 MpegTSWrite *ts = s->priv_data;
849 uint8_t buf[TS_PACKET_SIZE];
851 int val, is_start, len, header_len, write_pcr, private_code, flags;
852 int afc_len, stuffing_len;
853 int64_t pcr = -1; /* avoid warning */
854 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
857 while (payload_size > 0) {
858 retransmit_si_info(s);
861 if (ts_st->pid == ts_st->service->pcr_pid) {
862 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
863 ts_st->service->pcr_packet_count++;
864 if (ts_st->service->pcr_packet_count >=
865 ts_st->service->pcr_packet_period) {
866 ts_st->service->pcr_packet_count = 0;
871 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
872 (dts - get_pcr(ts, s->pb) / 300) > delay) {
873 /* pcr insert gets priority over null packet insert */
875 mpegts_insert_pcr_only(s, st);
877 mpegts_insert_null_packet(s);
878 /* recalculate write_pcr and possibly retransmit si_info */
882 /* prepare packet header */
885 val = ts_st->pid >> 8;
890 ts_st->cc = ts_st->cc + 1 & 0xf;
891 *q++ = 0x10 | ts_st->cc; // payload indicator + CC
892 if (key && is_start && pts != AV_NOPTS_VALUE) {
893 // set Random Access for key frames
894 if (ts_st->pid == ts_st->service->pcr_pid)
896 set_af_flag(buf, 0x40);
897 q = get_ts_payload_start(buf);
900 set_af_flag(buf, 0x10);
901 q = get_ts_payload_start(buf);
902 // add 11, pcr references the last byte of program clock reference base
903 if (ts->mux_rate > 1)
904 pcr = get_pcr(ts, s->pb);
906 pcr = (dts - delay) * 300;
907 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
908 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
909 extend_af(buf, write_pcr_bits(q, pcr));
910 q = get_ts_payload_start(buf);
913 int pes_extension = 0;
914 /* write PES header */
919 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
920 if (st->codec->codec_id == AV_CODEC_ID_DIRAC)
924 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
925 (st->codec->codec_id == AV_CODEC_ID_MP2 ||
926 st->codec->codec_id == AV_CODEC_ID_MP3 ||
927 st->codec->codec_id == AV_CODEC_ID_AAC)) {
931 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
936 if (pts != AV_NOPTS_VALUE) {
940 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
944 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
945 st->codec->codec_id == AV_CODEC_ID_DIRAC) {
946 /* set PES_extension_flag */
950 /* One byte for PES2 extension flag +
951 * one byte for extension length +
952 * one byte for extension id */
955 len = payload_size + header_len + 3;
956 if (private_code != 0)
963 /* data alignment indicator is required for subtitle data */
964 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
969 if (pts != AV_NOPTS_VALUE) {
970 write_pts(q, flags >> 6, pts);
973 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
974 write_pts(q, 1, dts);
977 if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {
978 flags = 0x01; /* set PES_extension_flag_2 */
980 *q++ = 0x80 | 0x01; /* marker bit + extension length */
981 /* Set the stream ID extension flag bit to 0 and
982 * write the extended stream ID. */
985 if (private_code != 0)
990 header_len = q - buf;
992 len = TS_PACKET_SIZE - header_len;
993 if (len > payload_size)
995 stuffing_len = TS_PACKET_SIZE - header_len - len;
996 if (stuffing_len > 0) {
997 /* add stuffing with AFC */
999 /* stuffing already present: increase its size */
1000 afc_len = buf[4] + 1;
1001 memmove(buf + 4 + afc_len + stuffing_len,
1003 header_len - (4 + afc_len));
1004 buf[4] += stuffing_len;
1005 memset(buf + 4 + afc_len, 0xff, stuffing_len);
1008 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
1010 buf[4] = stuffing_len - 1;
1011 if (stuffing_len >= 2) {
1013 memset(buf + 6, 0xff, stuffing_len - 2);
1017 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
1019 payload_size -= len;
1020 mpegts_prefix_m2ts_header(s);
1021 avio_write(s->pb, buf, TS_PACKET_SIZE);
1026 static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1028 AVStream *st = s->streams[pkt->stream_index];
1029 int size = pkt->size;
1030 uint8_t *buf = pkt->data;
1031 uint8_t *data = NULL;
1032 MpegTSWrite *ts = s->priv_data;
1033 MpegTSWriteStream *ts_st = st->priv_data;
1034 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE) * 2;
1035 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
1037 if (ts->reemit_pat_pmt) {
1038 av_log(s, AV_LOG_WARNING,
1039 "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
1040 ts->reemit_pat_pmt = 0;
1041 ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;
1044 if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
1045 ts->pat_packet_count = ts->pat_packet_period - 1;
1046 ts->sdt_packet_count = ts->sdt_packet_period - 1;
1047 ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
1050 if (pkt->pts != AV_NOPTS_VALUE)
1051 pts = pkt->pts + delay;
1052 if (pkt->dts != AV_NOPTS_VALUE)
1053 dts = pkt->dts + delay;
1055 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
1056 av_log(s, AV_LOG_ERROR, "first pts value must set\n");
1057 return AVERROR_INVALIDDATA;
1059 ts_st->first_pts_check = 0;
1061 if (st->codec->codec_id == AV_CODEC_ID_H264) {
1062 const uint8_t *p = buf, *buf_end = p + size;
1063 uint32_t state = -1;
1065 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
1066 av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
1067 "no startcode found, use -bsf h264_mp4toannexb\n");
1068 return AVERROR_INVALIDDATA;
1072 p = avpriv_find_start_code(p, buf_end, &state);
1073 av_dlog(s, "nal %d\n", state & 0x1f);
1074 } while (p < buf_end && (state & 0x1f) != 9 &&
1075 (state & 0x1f) != 5 && (state & 0x1f) != 1);
1077 if ((state & 0x1f) != 9) { // AUD NAL
1078 data = av_malloc(pkt->size + 6);
1080 return AVERROR(ENOMEM);
1081 memcpy(data + 6, pkt->data, pkt->size);
1082 AV_WB32(data, 0x00000001);
1084 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1086 size = pkt->size + 6;
1088 } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {
1089 if (pkt->size < 2) {
1090 av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
1091 return AVERROR_INVALIDDATA;
1093 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
1098 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
1099 "and extradata missing\n");
1100 return AVERROR_INVALIDDATA;
1103 av_init_packet(&pkt2);
1104 pkt2.data = pkt->data;
1105 pkt2.size = pkt->size;
1107 ret = avio_open_dyn_buf(&ts_st->amux->pb);
1109 return AVERROR(ENOMEM);
1111 ret = av_write_frame(ts_st->amux, &pkt2);
1113 avio_close_dyn_buf(ts_st->amux->pb, &data);
1114 ts_st->amux->pb = NULL;
1118 size = avio_close_dyn_buf(ts_st->amux->pb, &data);
1119 ts_st->amux->pb = NULL;
1124 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
1125 // for video and subtitle, write a single pes packet
1126 mpegts_write_pes(s, st, buf, size, pts, dts,
1127 pkt->flags & AV_PKT_FLAG_KEY);
1132 if (ts_st->payload_size + size > ts->pes_payload_size) {
1133 if (ts_st->payload_size) {
1134 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1135 ts_st->payload_pts, ts_st->payload_dts,
1136 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1137 ts_st->payload_size = 0;
1139 if (size > ts->pes_payload_size) {
1140 mpegts_write_pes(s, st, buf, size, pts, dts,
1141 pkt->flags & AV_PKT_FLAG_KEY);
1147 if (!ts_st->payload_size) {
1148 ts_st->payload_pts = pts;
1149 ts_st->payload_dts = dts;
1150 ts_st->payload_flags = pkt->flags;
1153 memcpy(ts_st->payload + ts_st->payload_size, buf, size);
1154 ts_st->payload_size += size;
1161 static void mpegts_write_flush(AVFormatContext *s)
1165 /* flush current packets */
1166 for (i = 0; i < s->nb_streams; i++) {
1167 AVStream *st = s->streams[i];
1168 MpegTSWriteStream *ts_st = st->priv_data;
1169 if (ts_st->payload_size > 0) {
1170 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1171 ts_st->payload_pts, ts_st->payload_dts,
1172 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1173 ts_st->payload_size = 0;
1179 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
1182 mpegts_write_flush(s);
1185 return mpegts_write_packet_internal(s, pkt);
1189 static int mpegts_write_end(AVFormatContext *s)
1191 MpegTSWrite *ts = s->priv_data;
1192 MpegTSService *service;
1196 mpegts_write_flush(s);
1198 for (i = 0; i < s->nb_streams; i++) {
1199 AVStream *st = s->streams[i];
1200 MpegTSWriteStream *ts_st = st->priv_data;
1201 av_freep(&ts_st->payload);
1203 avformat_free_context(ts_st->amux);
1208 for (i = 0; i < ts->nb_services; i++) {
1209 service = ts->services[i];
1210 av_freep(&service->provider_name);
1211 av_freep(&service->name);
1214 av_free(ts->services);
1219 static const AVOption options[] = {
1220 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
1221 offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT,
1222 { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1223 { "mpegts_original_network_id", "Set original_network_id field.",
1224 offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT,
1225 { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1226 { "mpegts_service_id", "Set service_id field.",
1227 offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT,
1228 { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1229 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
1230 offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT,
1231 { .i64 = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM },
1232 { "mpegts_start_pid", "Set the first pid.",
1233 offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT,
1234 { .i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM },
1235 {"mpegts_m2ts_mode", "Enable m2ts mode.",
1236 offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT,
1237 { .i64 = -1 }, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
1239 offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT,
1240 { .i64 = 1 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1241 { "pes_payload_size", "Minimum PES packet payload in bytes",
1242 offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT,
1243 { .i64 = DEFAULT_PES_PAYLOAD_SIZE }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1244 { "mpegts_flags", "MPEG-TS muxing flags",
1245 offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, 0, INT_MAX,
1246 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1247 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1248 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_REEMIT_PAT_PMT }, 0, INT_MAX,
1249 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1250 { "latm", "Use LATM packetization for AAC",
1251 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_AAC_LATM }, 0, INT_MAX,
1252 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1253 // backward compatibility
1254 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1255 offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT,
1256 { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1257 { "pcr_period", "PCR retransmission time",
1258 offsetof(MpegTSWrite, pcr_period), AV_OPT_TYPE_INT,
1259 { .i64 = PCR_RETRANS_TIME }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1263 static const AVClass mpegts_muxer_class = {
1264 .class_name = "MPEGTS muxer",
1265 .item_name = av_default_item_name,
1267 .version = LIBAVUTIL_VERSION_INT,
1270 AVOutputFormat ff_mpegts_muxer = {
1272 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
1273 .mime_type = "video/MP2T",
1274 .extensions = "ts,m2t,m2ts,mts",
1275 .priv_data_size = sizeof(MpegTSWrite),
1276 .audio_codec = AV_CODEC_ID_MP2,
1277 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1278 .write_header = mpegts_write_header,
1279 .write_packet = mpegts_write_packet,
1280 .write_trailer = mpegts_write_end,
1281 .flags = AVFMT_ALLOW_FLUSH,
1282 .priv_class = &mpegts_muxer_class,