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"
28 #include "libavcodec/internal.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
73 int transport_stream_id;
74 int original_network_id;
80 int reemit_pat_pmt; // backward compatibility
83 #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
84 #define MPEGTS_FLAG_AAC_LATM 0x02
88 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
89 #define DEFAULT_PES_HEADER_FREQ 16
90 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
92 /* NOTE: 4 bytes must be left at the end for the crc32 */
93 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
96 unsigned char packet[TS_PACKET_SIZE];
97 const unsigned char *buf_ptr;
99 int first, b, len1, left;
101 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
102 buf[len - 4] = (crc >> 24) & 0xff;
103 buf[len - 3] = (crc >> 16) & 0xff;
104 buf[len - 2] = (crc >> 8) & 0xff;
105 buf[len - 1] = (crc) & 0xff;
107 /* send each packet */
110 first = (buf == buf_ptr);
118 s->cc = (s->cc + 1) & 0xf;
121 *q++ = 0; /* 0 offset */
122 len1 = TS_PACKET_SIZE - (q - packet);
125 memcpy(q, buf_ptr, len1);
127 /* add known padding data */
128 left = TS_PACKET_SIZE - (q - packet);
130 memset(q, 0xff, left);
132 s->write_packet(s, packet);
139 static inline void put16(uint8_t **q_ptr, int val)
148 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
149 int version, int sec_num, int last_sec_num,
150 uint8_t *buf, int len)
152 uint8_t section[1024], *q;
153 unsigned int tot_len;
154 /* reserved_future_use field must be set to 1 for SDT */
155 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
157 tot_len = 3 + 5 + len + 4;
158 /* check if not too big */
164 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
166 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
171 mpegts_write_section(s, section, tot_len);
175 /*********************************************/
178 #define DEFAULT_PROVIDER_NAME "Libav"
179 #define DEFAULT_SERVICE_NAME "Service01"
181 /* we retransmit the SI info at this rate */
182 #define SDT_RETRANS_TIME 500
183 #define PAT_RETRANS_TIME 100
184 #define PCR_RETRANS_TIME 20
186 typedef struct MpegTSWriteStream {
187 struct MpegTSService *service;
188 int pid; /* stream associated pid */
191 int first_pts_check; ///< first pts check needed
196 AVFormatContext *amux;
199 static void mpegts_write_pat(AVFormatContext *s)
201 MpegTSWrite *ts = s->priv_data;
202 MpegTSService *service;
203 uint8_t data[1012], *q;
207 for(i = 0; i < ts->nb_services; i++) {
208 service = ts->services[i];
209 put16(&q, service->sid);
210 put16(&q, 0xe000 | service->pmt.pid);
212 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
216 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
218 MpegTSWrite *ts = s->priv_data;
219 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
220 int val, stream_type, i;
223 put16(&q, 0xe000 | service->pcr_pid);
225 program_info_length_ptr = q;
226 q += 2; /* patched after */
228 /* put program info here */
230 val = 0xf000 | (q - program_info_length_ptr - 2);
231 program_info_length_ptr[0] = val >> 8;
232 program_info_length_ptr[1] = val;
234 for(i = 0; i < s->nb_streams; i++) {
235 AVStream *st = s->streams[i];
236 MpegTSWriteStream *ts_st = st->priv_data;
237 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
238 switch(st->codec->codec_id) {
239 case AV_CODEC_ID_MPEG1VIDEO:
240 case AV_CODEC_ID_MPEG2VIDEO:
241 stream_type = STREAM_TYPE_VIDEO_MPEG2;
243 case AV_CODEC_ID_MPEG4:
244 stream_type = STREAM_TYPE_VIDEO_MPEG4;
246 case AV_CODEC_ID_H264:
247 stream_type = STREAM_TYPE_VIDEO_H264;
249 case AV_CODEC_ID_CAVS:
250 stream_type = STREAM_TYPE_VIDEO_CAVS;
252 case AV_CODEC_ID_DIRAC:
253 stream_type = STREAM_TYPE_VIDEO_DIRAC;
255 case AV_CODEC_ID_MP2:
256 case AV_CODEC_ID_MP3:
257 stream_type = STREAM_TYPE_AUDIO_MPEG1;
259 case AV_CODEC_ID_AAC:
260 stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM) ? STREAM_TYPE_AUDIO_AAC_LATM : STREAM_TYPE_AUDIO_AAC;
262 case AV_CODEC_ID_AAC_LATM:
263 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
265 case AV_CODEC_ID_AC3:
266 stream_type = STREAM_TYPE_AUDIO_AC3;
269 stream_type = STREAM_TYPE_PRIVATE_DATA;
273 put16(&q, 0xe000 | ts_st->pid);
275 q += 2; /* patched after */
277 /* write optional descriptors here */
278 switch(st->codec->codec_type) {
279 case AVMEDIA_TYPE_AUDIO:
282 char *next = lang->value;
285 *q++ = 0x0a; /* ISO 639 language descriptor */
289 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
290 next = strchr(p, ',');
291 if (strlen(p) != 3 && (!next || next != p + 3))
292 continue; /* not a 3-letter code */
298 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
300 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
302 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
305 *q++ = 0; /* undefined type */
311 q -= 2; /* no language codes were written */
314 case AVMEDIA_TYPE_SUBTITLE:
316 const char *language;
317 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
323 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
324 if(st->codec->extradata_size == 4) {
325 memcpy(q, st->codec->extradata, 4);
328 put16(&q, 1); /* page id */
329 put16(&q, 1); /* ancillary page id */
333 case AVMEDIA_TYPE_VIDEO:
334 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
335 *q++ = 0x05; /*MPEG-2 registration descriptor*/
345 val = 0xf000 | (q - desc_length_ptr - 2);
346 desc_length_ptr[0] = val >> 8;
347 desc_length_ptr[1] = val;
349 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
353 /* NOTE: str == NULL is accepted for an empty string */
354 static void putstr8(uint8_t **q_ptr, const char *str)
370 static void mpegts_write_sdt(AVFormatContext *s)
372 MpegTSWrite *ts = s->priv_data;
373 MpegTSService *service;
374 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
375 int i, running_status, free_ca_mode, val;
380 for(i = 0; i < ts->nb_services; i++) {
381 service = ts->services[i];
382 put16(&q, service->sid);
383 *q++ = 0xfc | 0x00; /* currently no EIT info */
384 desc_list_len_ptr = q;
386 running_status = 4; /* running */
389 /* write only one descriptor for the service name and provider */
393 *q++ = 0x01; /* digital television service */
394 putstr8(&q, service->provider_name);
395 putstr8(&q, service->name);
396 desc_len_ptr[0] = q - desc_len_ptr - 1;
398 /* fill descriptor length */
399 val = (running_status << 13) | (free_ca_mode << 12) |
400 (q - desc_list_len_ptr - 2);
401 desc_list_len_ptr[0] = val >> 8;
402 desc_list_len_ptr[1] = val;
404 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
408 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
410 const char *provider_name,
413 MpegTSService *service;
415 service = av_mallocz(sizeof(MpegTSService));
418 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
420 service->provider_name = av_strdup(provider_name);
421 service->name = av_strdup(name);
422 service->pcr_pid = 0x1fff;
423 dynarray_add(&ts->services, &ts->nb_services, service);
427 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
429 AVFormatContext *ctx = s->opaque;
430 avio_write(ctx->pb, packet, TS_PACKET_SIZE);
433 static int mpegts_write_header(AVFormatContext *s)
435 MpegTSWrite *ts = s->priv_data;
436 MpegTSWriteStream *ts_st;
437 MpegTSService *service;
438 AVStream *st, *pcr_st = NULL;
439 AVDictionaryEntry *title, *provider;
441 const char *service_name;
442 const char *provider_name;
446 if (s->max_delay < 0) /* Not set by the caller */
449 // round up to a whole number of TS packets
450 ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
452 ts->tsid = ts->transport_stream_id;
453 ts->onid = ts->original_network_id;
454 /* allocate a single DVB service */
455 title = av_dict_get(s->metadata, "service_name", NULL, 0);
457 title = av_dict_get(s->metadata, "title", NULL, 0);
458 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
459 provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
460 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
461 service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
462 service->pmt.write_packet = section_write_packet;
463 service->pmt.opaque = s;
464 service->pmt.cc = 15;
466 ts->pat.pid = PAT_PID;
467 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
468 ts->pat.write_packet = section_write_packet;
471 ts->sdt.pid = SDT_PID;
473 ts->sdt.write_packet = section_write_packet;
476 pids = av_malloc(s->nb_streams * sizeof(*pids));
478 return AVERROR(ENOMEM);
480 /* assign pids to each stream */
481 for(i = 0;i < s->nb_streams; i++) {
483 avpriv_set_pts_info(st, 33, 1, 90000);
484 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
486 ret = AVERROR(ENOMEM);
489 st->priv_data = ts_st;
490 ts_st->payload = av_mallocz(ts->pes_payload_size);
491 if (!ts_st->payload) {
492 ret = AVERROR(ENOMEM);
495 ts_st->service = service;
496 /* MPEG pid values < 16 are reserved. Applications which set st->id in
497 * this range are assigned a calculated pid. */
499 ts_st->pid = ts->start_pid + i;
500 } else if (st->id < 0x1FFF) {
503 av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
504 ret = AVERROR(EINVAL);
507 if (ts_st->pid == service->pmt.pid) {
508 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
509 ret = AVERROR(EINVAL);
512 for (j = 0; j < i; j++)
513 if (pids[j] == ts_st->pid) {
514 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
515 ret = AVERROR(EINVAL);
518 pids[i] = ts_st->pid;
519 ts_st->payload_pts = AV_NOPTS_VALUE;
520 ts_st->payload_dts = AV_NOPTS_VALUE;
521 ts_st->first_pts_check = 1;
523 /* update PCR pid by using the first video stream */
524 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
525 service->pcr_pid == 0x1fff) {
526 service->pcr_pid = ts_st->pid;
529 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
530 st->codec->extradata_size > 0)
533 ts_st->amux = avformat_alloc_context();
535 ret = AVERROR(ENOMEM);
538 ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL);
539 if (!ts_st->amux->oformat) {
540 ret = AVERROR(EINVAL);
543 ast = avformat_new_stream(ts_st->amux, NULL);
544 ret = avcodec_copy_context(ast->codec, st->codec);
547 ret = avformat_write_header(ts_st->amux, NULL);
555 /* if no video stream, use the first stream as PCR */
556 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
557 pcr_st = s->streams[0];
558 ts_st = pcr_st->priv_data;
559 service->pcr_pid = ts_st->pid;
562 if (ts->mux_rate > 1) {
563 service->pcr_packet_period = (ts->mux_rate * ts->pcr_period) /
564 (TS_PACKET_SIZE * 8 * 1000);
565 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
566 (TS_PACKET_SIZE * 8 * 1000);
567 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
568 (TS_PACKET_SIZE * 8 * 1000);
570 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
572 /* Arbitrary values, PAT/PMT could be written on key frames */
573 ts->sdt_packet_period = 200;
574 ts->pat_packet_period = 40;
575 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
576 if (!pcr_st->codec->frame_size) {
577 av_log(s, AV_LOG_WARNING, "frame size not set\n");
578 service->pcr_packet_period =
579 pcr_st->codec->sample_rate/(10*512);
581 service->pcr_packet_period =
582 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
585 // max delta PCR 0.1s
586 service->pcr_packet_period =
587 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
591 // output a PCR as soon as possible
592 service->pcr_packet_count = service->pcr_packet_period;
593 ts->pat_packet_count = ts->pat_packet_period-1;
594 ts->sdt_packet_count = ts->sdt_packet_period-1;
596 if (ts->mux_rate == 1)
597 av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
599 av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
600 av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, "
601 "sdt every %d, pat/pmt every %d pkts\n",
602 service->pcr_packet_period,
603 ts->sdt_packet_period, ts->pat_packet_period);
611 for(i = 0;i < s->nb_streams; i++) {
612 MpegTSWriteStream *ts_st;
614 ts_st = st->priv_data;
616 av_freep(&ts_st->payload);
618 avformat_free_context(ts_st->amux);
622 av_freep(&st->priv_data);
627 /* send SDT, PAT and PMT tables regulary */
628 static void retransmit_si_info(AVFormatContext *s)
630 MpegTSWrite *ts = s->priv_data;
633 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
634 ts->sdt_packet_count = 0;
637 if (++ts->pat_packet_count == ts->pat_packet_period) {
638 ts->pat_packet_count = 0;
640 for(i = 0; i < ts->nb_services; i++) {
641 mpegts_write_pmt(s, ts->services[i]);
646 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
648 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
652 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
654 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
656 *buf++ = pcr_high >> 25;
657 *buf++ = pcr_high >> 17;
658 *buf++ = pcr_high >> 9;
659 *buf++ = pcr_high >> 1;
660 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
666 /* Write a single null transport stream packet */
667 static void mpegts_insert_null_packet(AVFormatContext *s)
670 uint8_t buf[TS_PACKET_SIZE];
677 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
678 avio_write(s->pb, buf, TS_PACKET_SIZE);
681 /* Write a single transport stream packet with a PCR and no payload */
682 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
684 MpegTSWrite *ts = s->priv_data;
685 MpegTSWriteStream *ts_st = st->priv_data;
687 uint8_t buf[TS_PACKET_SIZE];
691 *q++ = ts_st->pid >> 8;
693 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
694 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
695 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
696 *q++ = 0x10; /* Adaptation flags: PCR present */
698 /* PCR coded into 6 bytes */
699 q += write_pcr_bits(q, get_pcr(ts, s->pb));
702 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
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 == AV_CODEC_ID_DIRAC) {
838 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
839 (st->codec->codec_id == AV_CODEC_ID_MP2 ||
840 st->codec->codec_id == AV_CODEC_ID_MP3 ||
841 st->codec->codec_id == AV_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 == AV_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 == AV_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 avio_write(s->pb, buf, TS_PACKET_SIZE);
944 static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
946 AVStream *st = s->streams[pkt->stream_index];
947 int size = pkt->size;
948 uint8_t *buf= pkt->data;
950 MpegTSWrite *ts = s->priv_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 (ts->reemit_pat_pmt) {
956 av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
957 ts->reemit_pat_pmt = 0;
958 ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;
961 if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
962 ts->pat_packet_count = ts->pat_packet_period - 1;
963 ts->sdt_packet_count = ts->sdt_packet_period - 1;
964 ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
967 if (pkt->pts != AV_NOPTS_VALUE)
968 pts = pkt->pts + delay;
969 if (pkt->dts != AV_NOPTS_VALUE)
970 dts = pkt->dts + delay;
972 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
973 av_log(s, AV_LOG_ERROR, "first pts value must set\n");
974 return AVERROR(EINVAL);
976 ts_st->first_pts_check = 0;
978 if (st->codec->codec_id == AV_CODEC_ID_H264) {
979 const uint8_t *p = buf, *buf_end = p+size;
982 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
983 av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
984 "no startcode found, use -bsf h264_mp4toannexb\n");
985 return AVERROR(EINVAL);
989 p = avpriv_find_start_code(p, buf_end, &state);
990 av_dlog(s, "nal %d\n", state & 0x1f);
991 } while (p < buf_end && (state & 0x1f) != 9 &&
992 (state & 0x1f) != 5 && (state & 0x1f) != 1);
994 if ((state & 0x1f) != 9) { // AUD NAL
995 data = av_malloc(pkt->size+6);
997 return AVERROR(ENOMEM);
998 memcpy(data+6, pkt->data, pkt->size);
999 AV_WB32(data, 0x00000001);
1001 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1005 } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {
1006 if (pkt->size < 2) {
1007 av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
1008 return AVERROR(EINVAL);
1010 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
1015 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
1016 "and extradata missing\n");
1017 return AVERROR(EINVAL);
1020 av_init_packet(&pkt2);
1021 pkt2.data = pkt->data;
1022 pkt2.size = pkt->size;
1023 ret = avio_open_dyn_buf(&ts_st->amux->pb);
1025 return AVERROR(ENOMEM);
1027 ret = av_write_frame(ts_st->amux, &pkt2);
1029 avio_close_dyn_buf(ts_st->amux->pb, &data);
1030 ts_st->amux->pb = NULL;
1034 size = avio_close_dyn_buf(ts_st->amux->pb, &data);
1035 ts_st->amux->pb = NULL;
1040 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
1041 // for video and subtitle, write a single pes packet
1042 mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);
1047 if (ts_st->payload_size + size > ts->pes_payload_size) {
1048 if (ts_st->payload_size) {
1049 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1050 ts_st->payload_pts, ts_st->payload_dts,
1051 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1052 ts_st->payload_size = 0;
1054 if (size > ts->pes_payload_size) {
1055 mpegts_write_pes(s, st, buf, size, pts, dts,
1056 pkt->flags & AV_PKT_FLAG_KEY);
1062 if (!ts_st->payload_size) {
1063 ts_st->payload_pts = pts;
1064 ts_st->payload_dts = dts;
1065 ts_st->payload_flags = pkt->flags;
1068 memcpy(ts_st->payload + ts_st->payload_size, buf, size);
1069 ts_st->payload_size += size;
1076 static void mpegts_write_flush(AVFormatContext *s)
1080 /* flush current packets */
1081 for(i = 0; i < s->nb_streams; i++) {
1082 AVStream *st = s->streams[i];
1083 MpegTSWriteStream *ts_st = st->priv_data;
1084 if (ts_st->payload_size > 0) {
1085 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1086 ts_st->payload_pts, ts_st->payload_dts,
1087 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1088 ts_st->payload_size = 0;
1094 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
1097 mpegts_write_flush(s);
1100 return mpegts_write_packet_internal(s, pkt);
1104 static int mpegts_write_end(AVFormatContext *s)
1106 MpegTSWrite *ts = s->priv_data;
1107 MpegTSService *service;
1110 mpegts_write_flush(s);
1112 for(i = 0; i < s->nb_streams; i++) {
1113 AVStream *st = s->streams[i];
1114 MpegTSWriteStream *ts_st = st->priv_data;
1115 av_freep(&ts_st->payload);
1117 avformat_free_context(ts_st->amux);
1122 for(i = 0; i < ts->nb_services; i++) {
1123 service = ts->services[i];
1124 av_freep(&service->provider_name);
1125 av_freep(&service->name);
1128 av_free(ts->services);
1133 static const AVOption options[] = {
1134 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
1135 offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
1136 { "mpegts_original_network_id", "Set original_network_id field.",
1137 offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
1138 { "mpegts_service_id", "Set service_id field.",
1139 offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
1140 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
1141 offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
1142 { "mpegts_start_pid", "Set the first pid.",
1143 offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
1144 { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
1145 { "pes_payload_size", "Minimum PES packet payload in bytes",
1146 offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
1147 { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX,
1148 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1149 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1150 0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,
1151 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
1152 { "latm", "Use LATM packetization for AAC",
1153 0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,
1154 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
1155 // backward compatibility
1156 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1157 offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
1158 { "pcr_period", "PCR retransmission time",
1159 offsetof(MpegTSWrite, pcr_period), AV_OPT_TYPE_INT, { .i64 = PCR_RETRANS_TIME }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1163 static const AVClass mpegts_muxer_class = {
1164 .class_name = "MPEGTS muxer",
1165 .item_name = av_default_item_name,
1167 .version = LIBAVUTIL_VERSION_INT,
1170 AVOutputFormat ff_mpegts_muxer = {
1172 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
1173 .mime_type = "video/x-mpegts",
1174 .extensions = "ts,m2t",
1175 .priv_data_size = sizeof(MpegTSWrite),
1176 .audio_codec = AV_CODEC_ID_MP2,
1177 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1178 .write_header = mpegts_write_header,
1179 .write_packet = mpegts_write_packet,
1180 .write_trailer = mpegts_write_end,
1181 .flags = AVFMT_ALLOW_FLUSH,
1182 .priv_class = &mpegts_muxer_class,