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;
82 int reemit_pat_pmt; // backward compatibility
85 #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
86 #define MPEGTS_FLAG_AAC_LATM 0x02
90 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
91 #define DEFAULT_PES_HEADER_FREQ 16
92 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
94 /* The section length is 12 bits. The first 2 are set to 0, the remaining
95 * 10 bits should not exceed 1021. */
96 #define SECTION_LENGTH 1020
98 /* NOTE: 4 bytes must be left at the end for the crc32 */
99 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
102 unsigned char packet[TS_PACKET_SIZE];
103 const unsigned char *buf_ptr;
105 int first, b, len1, left;
107 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE),
110 buf[len - 4] = (crc >> 24) & 0xff;
111 buf[len - 3] = (crc >> 16) & 0xff;
112 buf[len - 2] = (crc >> 8) & 0xff;
113 buf[len - 1] = crc & 0xff;
115 /* send each packet */
118 first = buf == buf_ptr;
126 s->cc = s->cc + 1 & 0xf;
129 *q++ = 0; /* 0 offset */
130 len1 = TS_PACKET_SIZE - (q - packet);
133 memcpy(q, buf_ptr, len1);
135 /* add known padding data */
136 left = TS_PACKET_SIZE - (q - packet);
138 memset(q, 0xff, left);
140 s->write_packet(s, packet);
147 static inline void put16(uint8_t **q_ptr, int val)
156 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
157 int version, int sec_num, int last_sec_num,
158 uint8_t *buf, int len)
160 uint8_t section[1024], *q;
161 unsigned int tot_len;
162 /* reserved_future_use field must be set to 1 for SDT */
163 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
165 tot_len = 3 + 5 + len + 4;
166 /* check if not too big */
168 return AVERROR_INVALIDDATA;
172 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
174 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
179 mpegts_write_section(s, section, tot_len);
183 /*********************************************/
186 #define DEFAULT_PROVIDER_NAME "Libav"
187 #define DEFAULT_SERVICE_NAME "Service01"
189 /* we retransmit the SI info at this rate */
190 #define SDT_RETRANS_TIME 500
191 #define PAT_RETRANS_TIME 100
192 #define PCR_RETRANS_TIME 20
194 typedef struct MpegTSWriteStream {
195 struct MpegTSService *service;
196 int pid; /* stream associated pid */
199 int first_pts_check; ///< first pts check needed
204 AVFormatContext *amux;
208 static void mpegts_write_pat(AVFormatContext *s)
210 MpegTSWrite *ts = s->priv_data;
211 MpegTSService *service;
212 uint8_t data[SECTION_LENGTH], *q;
216 for (i = 0; i < ts->nb_services; i++) {
217 service = ts->services[i];
218 put16(&q, service->sid);
219 put16(&q, 0xe000 | service->pmt.pid);
221 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
225 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
227 MpegTSWrite *ts = s->priv_data;
228 uint8_t data[SECTION_LENGTH], *q, *desc_length_ptr, *program_info_length_ptr;
229 int val, stream_type, i, err = 0;
232 put16(&q, 0xe000 | service->pcr_pid);
234 program_info_length_ptr = q;
235 q += 2; /* patched after */
237 /* put program info here */
239 val = 0xf000 | (q - program_info_length_ptr - 2);
240 program_info_length_ptr[0] = val >> 8;
241 program_info_length_ptr[1] = val;
243 for (i = 0; i < s->nb_streams; i++) {
244 AVStream *st = s->streams[i];
245 MpegTSWriteStream *ts_st = st->priv_data;
246 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL, 0);
248 if (q - data > SECTION_LENGTH - 3 - 2 - 6) {
252 switch (st->codec->codec_id) {
253 case AV_CODEC_ID_MPEG1VIDEO:
254 case AV_CODEC_ID_MPEG2VIDEO:
255 stream_type = STREAM_TYPE_VIDEO_MPEG2;
257 case AV_CODEC_ID_MPEG4:
258 stream_type = STREAM_TYPE_VIDEO_MPEG4;
260 case AV_CODEC_ID_H264:
261 stream_type = STREAM_TYPE_VIDEO_H264;
263 case AV_CODEC_ID_HEVC:
264 stream_type = STREAM_TYPE_VIDEO_HEVC;
266 case AV_CODEC_ID_CAVS:
267 stream_type = STREAM_TYPE_VIDEO_CAVS;
269 case AV_CODEC_ID_DIRAC:
270 stream_type = STREAM_TYPE_VIDEO_DIRAC;
272 case AV_CODEC_ID_MP2:
273 case AV_CODEC_ID_MP3:
274 stream_type = STREAM_TYPE_AUDIO_MPEG1;
276 case AV_CODEC_ID_AAC:
277 stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM)
278 ? STREAM_TYPE_AUDIO_AAC_LATM
279 : STREAM_TYPE_AUDIO_AAC;
281 case AV_CODEC_ID_AAC_LATM:
282 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
284 case AV_CODEC_ID_AC3:
285 stream_type = STREAM_TYPE_AUDIO_AC3;
288 stream_type = STREAM_TYPE_PRIVATE_DATA;
292 put16(&q, 0xe000 | ts_st->pid);
294 q += 2; /* patched after */
296 /* write optional descriptors here */
297 switch (st->codec->codec_type) {
298 case AVMEDIA_TYPE_AUDIO:
301 char *next = lang->value;
304 *q++ = 0x0a; /* ISO 639 language descriptor */
308 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
309 if (q - data > SECTION_LENGTH - 4) {
313 next = strchr(p, ',');
314 if (strlen(p) != 3 && (!next || next != p + 3))
315 continue; /* not a 3-letter code */
321 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
323 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
325 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
328 *q++ = 0; /* undefined type */
334 q -= 2; /* no language codes were written */
337 case AVMEDIA_TYPE_SUBTITLE:
339 const char *language;
340 language = lang && strlen(lang->value) == 3 ? lang->value : "eng";
346 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
348 if (q - data > SECTION_LENGTH - 4) {
353 if (st->codec->extradata_size == 4) {
354 memcpy(q, st->codec->extradata, 4);
357 put16(&q, 1); /* page id */
358 put16(&q, 1); /* ancillary page id */
362 case AVMEDIA_TYPE_VIDEO:
363 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
364 *q++ = 0x05; /*MPEG-2 registration descriptor*/
374 val = 0xf000 | (q - desc_length_ptr - 2);
375 desc_length_ptr[0] = val >> 8;
376 desc_length_ptr[1] = val;
380 av_log(s, AV_LOG_ERROR,
381 "The PMT section cannot fit stream %d and all following streams.\n"
382 "Try reducing the number of languages in the audio streams "
383 "or the total number of streams.\n", i);
385 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
389 /* NOTE: str == NULL is accepted for an empty string */
390 static void putstr8(uint8_t **q_ptr, const char *str)
406 static void mpegts_write_sdt(AVFormatContext *s)
408 MpegTSWrite *ts = s->priv_data;
409 MpegTSService *service;
410 uint8_t data[SECTION_LENGTH], *q, *desc_list_len_ptr, *desc_len_ptr;
411 int i, running_status, free_ca_mode, val;
416 for (i = 0; i < ts->nb_services; i++) {
417 service = ts->services[i];
418 put16(&q, service->sid);
419 *q++ = 0xfc | 0x00; /* currently no EIT info */
420 desc_list_len_ptr = q;
422 running_status = 4; /* running */
425 /* write only one descriptor for the service name and provider */
429 *q++ = 0x01; /* digital television service */
430 putstr8(&q, service->provider_name);
431 putstr8(&q, service->name);
432 desc_len_ptr[0] = q - desc_len_ptr - 1;
434 /* fill descriptor length */
435 val = (running_status << 13) | (free_ca_mode << 12) |
436 (q - desc_list_len_ptr - 2);
437 desc_list_len_ptr[0] = val >> 8;
438 desc_list_len_ptr[1] = val;
440 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
444 static MpegTSService *mpegts_add_service(MpegTSWrite *ts, int sid,
445 const char *provider_name,
448 MpegTSService *service;
450 service = av_mallocz(sizeof(MpegTSService));
453 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
455 service->pcr_pid = 0x1fff;
456 service->provider_name = av_strdup(provider_name);
457 service->name = av_strdup(name);
458 if (!service->provider_name || !service->name) {
459 av_free(service->provider_name);
460 av_free(service->name);
464 dynarray_add(&ts->services, &ts->nb_services, service);
468 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
470 AVFormatContext *ctx = s->opaque;
471 avio_write(ctx->pb, packet, TS_PACKET_SIZE);
474 static int mpegts_write_header(AVFormatContext *s)
476 MpegTSWrite *ts = s->priv_data;
477 MpegTSWriteStream *ts_st;
478 MpegTSService *service;
479 AVStream *st, *pcr_st = NULL;
480 AVDictionaryEntry *title, *provider;
482 const char *service_name;
483 const char *provider_name;
487 if (s->max_delay < 0) /* Not set by the caller */
490 // round up to a whole number of TS packets
491 ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
493 ts->tsid = ts->transport_stream_id;
494 ts->onid = ts->original_network_id;
495 /* allocate a single DVB service */
496 title = av_dict_get(s->metadata, "service_name", NULL, 0);
498 title = av_dict_get(s->metadata, "title", NULL, 0);
499 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
500 provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
501 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
502 service = mpegts_add_service(ts, ts->service_id,
503 provider_name, service_name);
506 return AVERROR(ENOMEM);
508 service->pmt.write_packet = section_write_packet;
509 service->pmt.opaque = s;
510 service->pmt.cc = 15;
512 ts->pat.pid = PAT_PID;
513 /* Initialize at 15 so that it wraps and is equal to 0 for the
514 * first packet we write. */
516 ts->pat.write_packet = section_write_packet;
519 ts->sdt.pid = SDT_PID;
521 ts->sdt.write_packet = section_write_packet;
524 pids = av_malloc(s->nb_streams * sizeof(*pids));
527 return AVERROR(ENOMEM);
530 /* assign pids to each stream */
531 for (i = 0; i < s->nb_streams; i++) {
534 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
536 ret = AVERROR(ENOMEM);
539 st->priv_data = ts_st;
541 ts_st->user_tb = st->time_base;
542 avpriv_set_pts_info(st, 33, 1, 90000);
544 ts_st->payload = av_mallocz(ts->pes_payload_size);
545 if (!ts_st->payload) {
546 ret = AVERROR(ENOMEM);
549 ts_st->service = service;
550 /* MPEG pid values < 16 are reserved. Applications which set st->id in
551 * this range are assigned a calculated pid. */
553 ts_st->pid = ts->start_pid + i;
554 } else if (st->id < 0x1FFF) {
557 av_log(s, AV_LOG_ERROR,
558 "Invalid stream id %d, must be less than 8191\n", st->id);
559 ret = AVERROR(EINVAL);
562 if (ts_st->pid == service->pmt.pid) {
563 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
564 ret = AVERROR(EINVAL);
567 for (j = 0; j < i; j++) {
568 if (pids[j] == ts_st->pid) {
569 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
570 ret = AVERROR(EINVAL);
574 pids[i] = ts_st->pid;
575 ts_st->payload_pts = AV_NOPTS_VALUE;
576 ts_st->payload_dts = AV_NOPTS_VALUE;
577 ts_st->first_pts_check = 1;
579 /* update PCR pid by using the first video stream */
580 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
581 service->pcr_pid == 0x1fff) {
582 service->pcr_pid = ts_st->pid;
585 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
586 st->codec->extradata_size > 0) {
588 ts_st->amux = avformat_alloc_context();
590 ret = AVERROR(ENOMEM);
593 ts_st->amux->oformat =
594 av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts",
596 if (!ts_st->amux->oformat) {
597 ret = AVERROR(EINVAL);
600 if (!(ast = avformat_new_stream(ts_st->amux, NULL))) {
601 ret = AVERROR(ENOMEM);
604 ret = avcodec_copy_context(ast->codec, st->codec);
607 ret = avformat_write_header(ts_st->amux, NULL);
615 /* if no video stream, use the first stream as PCR */
616 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
617 pcr_st = s->streams[0];
618 ts_st = pcr_st->priv_data;
619 service->pcr_pid = ts_st->pid;
621 ts_st = pcr_st->priv_data;
623 if (ts->mux_rate > 1) {
624 service->pcr_packet_period = (ts->mux_rate * ts->pcr_period) /
625 (TS_PACKET_SIZE * 8 * 1000);
626 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
627 (TS_PACKET_SIZE * 8 * 1000);
628 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
629 (TS_PACKET_SIZE * 8 * 1000);
631 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
633 /* Arbitrary values, PAT/PMT could be written on key frames */
634 ts->sdt_packet_period = 200;
635 ts->pat_packet_period = 40;
636 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
637 if (!pcr_st->codec->frame_size) {
638 av_log(s, AV_LOG_WARNING, "frame size not set\n");
639 service->pcr_packet_period =
640 pcr_st->codec->sample_rate / (10 * 512);
642 service->pcr_packet_period =
643 pcr_st->codec->sample_rate / (10 * pcr_st->codec->frame_size);
646 // max delta PCR 0.1s
647 // TODO: should be avg_frame_rate
648 service->pcr_packet_period =
649 ts_st->user_tb.den / (10 * ts_st->user_tb.num);
653 // output a PCR as soon as possible
654 service->pcr_packet_count = service->pcr_packet_period;
655 ts->pat_packet_count = ts->pat_packet_period - 1;
656 ts->sdt_packet_count = ts->sdt_packet_period - 1;
658 if (ts->mux_rate == 1)
659 av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
661 av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
662 av_log(s, AV_LOG_VERBOSE,
663 "pcr every %d pkts, sdt every %d, pat/pmt every %d pkts\n",
664 service->pcr_packet_period,
665 ts->sdt_packet_period, ts->pat_packet_period);
674 for (i = 0; i < s->nb_streams; i++) {
676 ts_st = st->priv_data;
678 av_freep(&ts_st->payload);
680 avformat_free_context(ts_st->amux);
684 av_freep(&st->priv_data);
689 /* send SDT, PAT and PMT tables regulary */
690 static void retransmit_si_info(AVFormatContext *s)
692 MpegTSWrite *ts = s->priv_data;
695 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
696 ts->sdt_packet_count = 0;
699 if (++ts->pat_packet_count == ts->pat_packet_period) {
700 ts->pat_packet_count = 0;
702 for (i = 0; i < ts->nb_services; i++)
703 mpegts_write_pmt(s, ts->services[i]);
707 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
709 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
713 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
715 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
717 *buf++ = pcr_high >> 25;
718 *buf++ = pcr_high >> 17;
719 *buf++ = pcr_high >> 9;
720 *buf++ = pcr_high >> 1;
721 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
727 /* Write a single null transport stream packet */
728 static void mpegts_insert_null_packet(AVFormatContext *s)
731 uint8_t buf[TS_PACKET_SIZE];
738 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
739 avio_write(s->pb, buf, TS_PACKET_SIZE);
742 /* Write a single transport stream packet with a PCR and no payload */
743 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
745 MpegTSWrite *ts = s->priv_data;
746 MpegTSWriteStream *ts_st = st->priv_data;
748 uint8_t buf[TS_PACKET_SIZE];
752 *q++ = ts_st->pid >> 8;
754 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
755 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
756 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
757 *q++ = 0x10; /* Adaptation flags: PCR present */
759 /* PCR coded into 6 bytes */
760 q += write_pcr_bits(q, get_pcr(ts, s->pb));
763 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
764 avio_write(s->pb, buf, TS_PACKET_SIZE);
767 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
771 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
773 val = (((pts >> 15) & 0x7fff) << 1) | 1;
776 val = (((pts) & 0x7fff) << 1) | 1;
781 /* Set an adaptation field flag in an MPEG-TS packet*/
782 static void set_af_flag(uint8_t *pkt, int flag)
784 // expect at least one flag to set
787 if ((pkt[3] & 0x20) == 0) {
788 // no AF yet, set adaptation field flag
790 // 1 byte length, no flags
797 /* Extend the adaptation field by size bytes */
798 static void extend_af(uint8_t *pkt, int size)
800 // expect already existing adaptation field
801 assert(pkt[3] & 0x20);
805 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
806 static uint8_t *get_ts_payload_start(uint8_t *pkt)
809 return pkt + 5 + pkt[4];
814 /* Add a PES header to the front of the payload, and segment into an integer
815 * number of TS packets. The final TS packet is padded using an oversized
816 * adaptation header to exactly fill the last TS packet.
817 * NOTE: 'payload' contains a complete PES payload. */
818 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
819 const uint8_t *payload, int payload_size,
820 int64_t pts, int64_t dts, int key)
822 MpegTSWriteStream *ts_st = st->priv_data;
823 MpegTSWrite *ts = s->priv_data;
824 uint8_t buf[TS_PACKET_SIZE];
826 int val, is_start, len, header_len, write_pcr, private_code, flags;
827 int afc_len, stuffing_len;
828 int64_t pcr = -1; /* avoid warning */
829 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
832 while (payload_size > 0) {
833 retransmit_si_info(s);
836 if (ts_st->pid == ts_st->service->pcr_pid) {
837 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
838 ts_st->service->pcr_packet_count++;
839 if (ts_st->service->pcr_packet_count >=
840 ts_st->service->pcr_packet_period) {
841 ts_st->service->pcr_packet_count = 0;
846 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
847 (dts - get_pcr(ts, s->pb) / 300) > delay) {
848 /* pcr insert gets priority over null packet insert */
850 mpegts_insert_pcr_only(s, st);
852 mpegts_insert_null_packet(s);
853 /* recalculate write_pcr and possibly retransmit si_info */
857 /* prepare packet header */
860 val = ts_st->pid >> 8;
865 ts_st->cc = ts_st->cc + 1 & 0xf;
866 *q++ = 0x10 | ts_st->cc; // payload indicator + CC
867 if (key && is_start && pts != AV_NOPTS_VALUE) {
868 // set Random Access for key frames
869 if (ts_st->pid == ts_st->service->pcr_pid)
871 set_af_flag(buf, 0x40);
872 q = get_ts_payload_start(buf);
875 set_af_flag(buf, 0x10);
876 q = get_ts_payload_start(buf);
877 // add 11, pcr references the last byte of program clock reference base
878 if (ts->mux_rate > 1)
879 pcr = get_pcr(ts, s->pb);
881 pcr = (dts - delay) * 300;
882 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
883 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
884 extend_af(buf, write_pcr_bits(q, pcr));
885 q = get_ts_payload_start(buf);
888 int pes_extension = 0;
889 /* write PES header */
894 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
895 if (st->codec->codec_id == AV_CODEC_ID_DIRAC)
899 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
900 (st->codec->codec_id == AV_CODEC_ID_MP2 ||
901 st->codec->codec_id == AV_CODEC_ID_MP3 ||
902 st->codec->codec_id == AV_CODEC_ID_AAC)) {
906 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
911 if (pts != AV_NOPTS_VALUE) {
915 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
919 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
920 st->codec->codec_id == AV_CODEC_ID_DIRAC) {
921 /* set PES_extension_flag */
925 /* One byte for PES2 extension flag +
926 * one byte for extension length +
927 * one byte for extension id */
930 len = payload_size + header_len + 3;
931 if (private_code != 0)
938 /* data alignment indicator is required for subtitle data */
939 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
944 if (pts != AV_NOPTS_VALUE) {
945 write_pts(q, flags >> 6, pts);
948 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
949 write_pts(q, 1, dts);
952 if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {
953 flags = 0x01; /* set PES_extension_flag_2 */
955 *q++ = 0x80 | 0x01; /* marker bit + extension length */
956 /* Set the stream ID extension flag bit to 0 and
957 * write the extended stream ID. */
960 if (private_code != 0)
965 header_len = q - buf;
967 len = TS_PACKET_SIZE - header_len;
968 if (len > payload_size)
970 stuffing_len = TS_PACKET_SIZE - header_len - len;
971 if (stuffing_len > 0) {
972 /* add stuffing with AFC */
974 /* stuffing already present: increase its size */
975 afc_len = buf[4] + 1;
976 memmove(buf + 4 + afc_len + stuffing_len,
978 header_len - (4 + afc_len));
979 buf[4] += stuffing_len;
980 memset(buf + 4 + afc_len, 0xff, stuffing_len);
983 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
985 buf[4] = stuffing_len - 1;
986 if (stuffing_len >= 2) {
988 memset(buf + 6, 0xff, stuffing_len - 2);
992 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
995 avio_write(s->pb, buf, TS_PACKET_SIZE);
1000 static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1002 AVStream *st = s->streams[pkt->stream_index];
1003 int size = pkt->size;
1004 uint8_t *buf = pkt->data;
1005 uint8_t *data = NULL;
1006 MpegTSWrite *ts = s->priv_data;
1007 MpegTSWriteStream *ts_st = st->priv_data;
1008 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE) * 2;
1009 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
1011 if (ts->reemit_pat_pmt) {
1012 av_log(s, AV_LOG_WARNING,
1013 "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
1014 ts->reemit_pat_pmt = 0;
1015 ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;
1018 if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
1019 ts->pat_packet_count = ts->pat_packet_period - 1;
1020 ts->sdt_packet_count = ts->sdt_packet_period - 1;
1021 ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
1024 if (pkt->pts != AV_NOPTS_VALUE)
1025 pts = pkt->pts + delay;
1026 if (pkt->dts != AV_NOPTS_VALUE)
1027 dts = pkt->dts + delay;
1029 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
1030 av_log(s, AV_LOG_ERROR, "first pts value must set\n");
1031 return AVERROR_INVALIDDATA;
1033 ts_st->first_pts_check = 0;
1035 if (st->codec->codec_id == AV_CODEC_ID_H264) {
1036 const uint8_t *p = buf, *buf_end = p + size;
1037 uint32_t state = -1;
1039 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
1040 av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
1041 "no startcode found, use -bsf h264_mp4toannexb\n");
1042 return AVERROR_INVALIDDATA;
1046 p = avpriv_find_start_code(p, buf_end, &state);
1047 av_dlog(s, "nal %d\n", state & 0x1f);
1048 } while (p < buf_end && (state & 0x1f) != 9 &&
1049 (state & 0x1f) != 5 && (state & 0x1f) != 1);
1051 if ((state & 0x1f) != 9) { // AUD NAL
1052 data = av_malloc(pkt->size + 6);
1054 return AVERROR(ENOMEM);
1055 memcpy(data + 6, pkt->data, pkt->size);
1056 AV_WB32(data, 0x00000001);
1058 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1060 size = pkt->size + 6;
1062 } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {
1063 if (pkt->size < 2) {
1064 av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
1065 return AVERROR_INVALIDDATA;
1067 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
1072 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
1073 "and extradata missing\n");
1074 return AVERROR_INVALIDDATA;
1077 av_init_packet(&pkt2);
1078 pkt2.data = pkt->data;
1079 pkt2.size = pkt->size;
1081 ret = avio_open_dyn_buf(&ts_st->amux->pb);
1083 return AVERROR(ENOMEM);
1085 ret = av_write_frame(ts_st->amux, &pkt2);
1087 avio_close_dyn_buf(ts_st->amux->pb, &data);
1088 ts_st->amux->pb = NULL;
1092 size = avio_close_dyn_buf(ts_st->amux->pb, &data);
1093 ts_st->amux->pb = NULL;
1098 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
1099 // for video and subtitle, write a single pes packet
1100 mpegts_write_pes(s, st, buf, size, pts, dts,
1101 pkt->flags & AV_PKT_FLAG_KEY);
1106 if (ts_st->payload_size + size > ts->pes_payload_size) {
1107 if (ts_st->payload_size) {
1108 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1109 ts_st->payload_pts, ts_st->payload_dts,
1110 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1111 ts_st->payload_size = 0;
1113 if (size > ts->pes_payload_size) {
1114 mpegts_write_pes(s, st, buf, size, pts, dts,
1115 pkt->flags & AV_PKT_FLAG_KEY);
1121 if (!ts_st->payload_size) {
1122 ts_st->payload_pts = pts;
1123 ts_st->payload_dts = dts;
1124 ts_st->payload_flags = pkt->flags;
1127 memcpy(ts_st->payload + ts_st->payload_size, buf, size);
1128 ts_st->payload_size += size;
1135 static void mpegts_write_flush(AVFormatContext *s)
1139 /* flush current packets */
1140 for (i = 0; i < s->nb_streams; i++) {
1141 AVStream *st = s->streams[i];
1142 MpegTSWriteStream *ts_st = st->priv_data;
1143 if (ts_st->payload_size > 0) {
1144 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1145 ts_st->payload_pts, ts_st->payload_dts,
1146 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1147 ts_st->payload_size = 0;
1153 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
1156 mpegts_write_flush(s);
1159 return mpegts_write_packet_internal(s, pkt);
1163 static int mpegts_write_end(AVFormatContext *s)
1165 MpegTSWrite *ts = s->priv_data;
1166 MpegTSService *service;
1169 mpegts_write_flush(s);
1171 for (i = 0; i < s->nb_streams; i++) {
1172 AVStream *st = s->streams[i];
1173 MpegTSWriteStream *ts_st = st->priv_data;
1174 av_freep(&ts_st->payload);
1176 avformat_free_context(ts_st->amux);
1181 for (i = 0; i < ts->nb_services; i++) {
1182 service = ts->services[i];
1183 av_freep(&service->provider_name);
1184 av_freep(&service->name);
1187 av_free(ts->services);
1192 static const AVOption options[] = {
1193 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
1194 offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT,
1195 { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1196 { "mpegts_original_network_id", "Set original_network_id field.",
1197 offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT,
1198 { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1199 { "mpegts_service_id", "Set service_id field.",
1200 offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT,
1201 { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1202 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
1203 offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT,
1204 { .i64 = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM },
1205 { "mpegts_start_pid", "Set the first pid.",
1206 offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT,
1207 { .i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM },
1209 offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT,
1210 { .i64 = 1 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1211 { "pes_payload_size", "Minimum PES packet payload in bytes",
1212 offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT,
1213 { .i64 = DEFAULT_PES_PAYLOAD_SIZE }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1214 { "mpegts_flags", "MPEG-TS muxing flags",
1215 offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, 0, INT_MAX,
1216 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1217 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1218 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_REEMIT_PAT_PMT }, 0, INT_MAX,
1219 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1220 { "latm", "Use LATM packetization for AAC",
1221 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_AAC_LATM }, 0, INT_MAX,
1222 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1223 // backward compatibility
1224 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1225 offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT,
1226 { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1227 { "pcr_period", "PCR retransmission time",
1228 offsetof(MpegTSWrite, pcr_period), AV_OPT_TYPE_INT,
1229 { .i64 = PCR_RETRANS_TIME }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1233 static const AVClass mpegts_muxer_class = {
1234 .class_name = "MPEGTS muxer",
1235 .item_name = av_default_item_name,
1237 .version = LIBAVUTIL_VERSION_INT,
1240 AVOutputFormat ff_mpegts_muxer = {
1242 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
1243 .mime_type = "video/x-mpegts",
1244 .extensions = "ts,m2t",
1245 .priv_data_size = sizeof(MpegTSWrite),
1246 .audio_codec = AV_CODEC_ID_MP2,
1247 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1248 .write_header = mpegts_write_header,
1249 .write_packet = mpegts_write_packet,
1250 .write_trailer = mpegts_write_end,
1251 .flags = AVFMT_ALLOW_FLUSH,
1252 .priv_class = &mpegts_muxer_class,