2 * MPEG-2 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/avassert.h"
23 #include "libavutil/bswap.h"
24 #include "libavutil/crc.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
30 #include "libavcodec/internal.h"
33 #include "avio_internal.h"
37 #define PCR_TIME_BASE 27000000
39 /* write DVB SI sections */
41 #define DVB_PRIVATE_NETWORK_START 0xff01
43 /*********************************************/
44 /* mpegts section writer */
46 typedef struct MpegTSSection {
50 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
54 typedef struct MpegTSService {
55 MpegTSSection pmt; /* MPEG-2 PMT table context */
56 int sid; /* service ID */
58 uint8_t provider_name[256];
63 // service_type values as defined in ETSI 300 468
65 MPEGTS_SERVICE_TYPE_DIGITAL_TV = 0x01,
66 MPEGTS_SERVICE_TYPE_DIGITAL_RADIO = 0x02,
67 MPEGTS_SERVICE_TYPE_TELETEXT = 0x03,
68 MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_RADIO = 0x0A,
69 MPEGTS_SERVICE_TYPE_MPEG2_DIGITAL_HDTV = 0x11,
70 MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_SDTV = 0x16,
71 MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_HDTV = 0x19,
72 MPEGTS_SERVICE_TYPE_HEVC_DIGITAL_HDTV = 0x1F,
74 typedef struct MpegTSWrite {
75 const AVClass *av_class;
76 MpegTSSection pat; /* MPEG-2 PAT table */
77 MpegTSSection sdt; /* MPEG-2 SDT table context */
78 MpegTSService **services;
79 int64_t sdt_period; /* SDT period in PCR time base */
80 int64_t pat_period; /* PAT/PMT period in PCR time base */
86 int mux_rate; ///< set to 1 when VBR
89 int transport_stream_id;
90 int original_network_id;
100 int m2ts_textsub_pid;
103 #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
104 #define MPEGTS_FLAG_AAC_LATM 0x02
105 #define MPEGTS_FLAG_PAT_PMT_AT_FRAMES 0x04
106 #define MPEGTS_FLAG_SYSTEM_B 0x08
107 #define MPEGTS_FLAG_DISCONT 0x10
111 int64_t pat_period_us;
112 int64_t sdt_period_us;
116 int omit_video_pes_length;
119 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
120 #define DEFAULT_PES_HEADER_FREQ 16
121 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
123 /* The section length is 12 bits. The first 2 are set to 0, the remaining
124 * 10 bits should not exceed 1021. */
125 #define SECTION_LENGTH 1020
127 /* NOTE: 4 bytes must be left at the end for the crc32 */
128 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
131 unsigned char packet[TS_PACKET_SIZE];
132 const unsigned char *buf_ptr;
134 int first, b, len1, left;
136 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE),
139 buf[len - 4] = (crc >> 24) & 0xff;
140 buf[len - 3] = (crc >> 16) & 0xff;
141 buf[len - 2] = (crc >> 8) & 0xff;
142 buf[len - 1] = crc & 0xff;
144 /* send each packet */
147 first = buf == buf_ptr;
155 s->cc = s->cc + 1 & 0xf;
157 if (s->discontinuity) {
161 s->discontinuity = 0;
164 *q++ = 0; /* 0 offset */
165 len1 = TS_PACKET_SIZE - (q - packet);
168 memcpy(q, buf_ptr, len1);
170 /* add known padding data */
171 left = TS_PACKET_SIZE - (q - packet);
173 memset(q, 0xff, left);
175 s->write_packet(s, packet);
182 static inline void put16(uint8_t **q_ptr, int val)
191 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
192 int version, int sec_num, int last_sec_num,
193 uint8_t *buf, int len)
195 uint8_t section[1024], *q;
196 unsigned int tot_len;
197 /* reserved_future_use field must be set to 1 for SDT */
198 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
200 tot_len = 3 + 5 + len + 4;
201 /* check if not too big */
203 return AVERROR_INVALIDDATA;
207 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
209 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
214 mpegts_write_section(s, section, tot_len);
218 /*********************************************/
221 #define DEFAULT_PROVIDER_NAME "FFmpeg"
222 #define DEFAULT_SERVICE_NAME "Service"
224 /* we retransmit the SI info at this rate */
225 #define SDT_RETRANS_TIME 500
226 #define PAT_RETRANS_TIME 100
227 #define PCR_RETRANS_TIME 20
229 typedef struct MpegTSWriteStream {
230 int pid; /* stream associated pid */
234 int first_pts_check; ///< first pts check needed
235 int prev_payload_key;
240 AVFormatContext *amux;
242 int64_t pcr_period; /* PCR period in PCR time base */
246 int opus_queued_samples;
247 int opus_pending_trim_start;
250 static void mpegts_write_pat(AVFormatContext *s)
252 MpegTSWrite *ts = s->priv_data;
253 MpegTSService *service;
254 uint8_t data[SECTION_LENGTH], *q;
258 for (i = 0; i < ts->nb_services; i++) {
259 service = ts->services[i];
260 put16(&q, service->sid);
261 put16(&q, 0xe000 | service->pmt.pid);
263 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, ts->tables_version, 0, 0,
267 static void putbuf(uint8_t **q_ptr, const uint8_t *buf, size_t len)
269 memcpy(*q_ptr, buf, len);
273 static void put_registration_descriptor(uint8_t **q_ptr, uint32_t tag)
276 *q++ = 0x05; /* MPEG-2 registration descriptor*/
285 static int mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
287 MpegTSWrite *ts = s->priv_data;
288 uint8_t data[SECTION_LENGTH], *q, *desc_length_ptr, *program_info_length_ptr;
289 int val, stream_type, i, err = 0;
292 put16(&q, 0xe000 | service->pcr_pid);
294 program_info_length_ptr = q;
295 q += 2; /* patched after */
297 /* put program info here */
299 val = 0xf000 | (q - program_info_length_ptr - 2);
300 program_info_length_ptr[0] = val >> 8;
301 program_info_length_ptr[1] = val;
303 for (i = 0; i < s->nb_streams; i++) {
304 AVStream *st = s->streams[i];
305 MpegTSWriteStream *ts_st = st->priv_data;
306 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL, 0);
308 if (s->nb_programs) {
310 AVProgram *program = service->program;
312 for (k = 0; k < program->nb_stream_indexes; k++)
313 if (program->stream_index[k] == i) {
322 if (q - data > SECTION_LENGTH - 32) {
326 switch (st->codecpar->codec_id) {
327 case AV_CODEC_ID_MPEG1VIDEO:
328 case AV_CODEC_ID_MPEG2VIDEO:
329 stream_type = STREAM_TYPE_VIDEO_MPEG2;
331 case AV_CODEC_ID_MPEG4:
332 stream_type = STREAM_TYPE_VIDEO_MPEG4;
334 case AV_CODEC_ID_H264:
335 stream_type = STREAM_TYPE_VIDEO_H264;
337 case AV_CODEC_ID_HEVC:
338 stream_type = STREAM_TYPE_VIDEO_HEVC;
340 case AV_CODEC_ID_CAVS:
341 stream_type = STREAM_TYPE_VIDEO_CAVS;
343 case AV_CODEC_ID_DIRAC:
344 stream_type = STREAM_TYPE_VIDEO_DIRAC;
346 case AV_CODEC_ID_VC1:
347 stream_type = STREAM_TYPE_VIDEO_VC1;
349 case AV_CODEC_ID_MP2:
350 case AV_CODEC_ID_MP3:
351 if ( st->codecpar->sample_rate > 0
352 && st->codecpar->sample_rate < 32000) {
353 stream_type = STREAM_TYPE_AUDIO_MPEG2;
355 stream_type = STREAM_TYPE_AUDIO_MPEG1;
358 case AV_CODEC_ID_AAC:
359 stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM)
360 ? STREAM_TYPE_AUDIO_AAC_LATM
361 : STREAM_TYPE_AUDIO_AAC;
363 case AV_CODEC_ID_AAC_LATM:
364 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
366 case AV_CODEC_ID_AC3:
367 stream_type = (ts->flags & MPEGTS_FLAG_SYSTEM_B)
368 ? STREAM_TYPE_PRIVATE_DATA
369 : STREAM_TYPE_AUDIO_AC3;
371 case AV_CODEC_ID_EAC3:
372 stream_type = (ts->flags & MPEGTS_FLAG_SYSTEM_B)
373 ? STREAM_TYPE_PRIVATE_DATA
374 : STREAM_TYPE_AUDIO_EAC3;
376 case AV_CODEC_ID_DTS:
377 stream_type = STREAM_TYPE_AUDIO_DTS;
379 case AV_CODEC_ID_TRUEHD:
380 stream_type = STREAM_TYPE_AUDIO_TRUEHD;
382 case AV_CODEC_ID_OPUS:
383 stream_type = STREAM_TYPE_PRIVATE_DATA;
385 case AV_CODEC_ID_TIMED_ID3:
386 stream_type = STREAM_TYPE_METADATA;
389 av_log(s, AV_LOG_WARNING, "Stream %d, codec %s, is muxed as a private data stream "
390 "and may not be recognized upon reading.\n", i, avcodec_get_name(st->codecpar->codec_id));
391 stream_type = STREAM_TYPE_PRIVATE_DATA;
396 put16(&q, 0xe000 | ts_st->pid);
398 q += 2; /* patched after */
400 /* write optional descriptors here */
401 switch (st->codecpar->codec_type) {
402 case AVMEDIA_TYPE_AUDIO:
403 if (st->codecpar->codec_id==AV_CODEC_ID_AC3 && (ts->flags & MPEGTS_FLAG_SYSTEM_B)) {
404 *q++=0x6a; // AC3 descriptor see A038 DVB SI
405 *q++=1; // 1 byte, all flags sets to 0
406 *q++=0; // omit all fields...
408 if (st->codecpar->codec_id==AV_CODEC_ID_EAC3 && (ts->flags & MPEGTS_FLAG_SYSTEM_B)) {
409 *q++=0x7a; // EAC3 descriptor see A038 DVB SI
410 *q++=1; // 1 byte, all flags sets to 0
411 *q++=0; // omit all fields...
413 if (st->codecpar->codec_id==AV_CODEC_ID_S302M)
414 put_registration_descriptor(&q, MKTAG('B', 'S', 'S', 'D'));
415 if (st->codecpar->codec_id==AV_CODEC_ID_OPUS) {
416 /* 6 bytes registration descriptor, 4 bytes Opus audio descriptor */
417 if (q - data > SECTION_LENGTH - 6 - 4) {
422 put_registration_descriptor(&q, MKTAG('O', 'p', 'u', 's'));
424 *q++ = 0x7f; /* DVB extension descriptor */
428 if (st->codecpar->extradata && st->codecpar->extradata_size >= 19) {
429 if (st->codecpar->extradata[18] == 0 && st->codecpar->channels <= 2) {
430 /* RTP mapping family */
431 *q++ = st->codecpar->channels;
432 } else if (st->codecpar->extradata[18] == 1 && st->codecpar->channels <= 8 &&
433 st->codecpar->extradata_size >= 21 + st->codecpar->channels) {
434 static const uint8_t coupled_stream_counts[9] = {
435 1, 0, 1, 1, 2, 2, 2, 3, 3
437 static const uint8_t channel_map_a[8][8] = {
444 {0, 4, 1, 2, 3, 5, 6},
445 {0, 6, 1, 2, 3, 4, 5, 7},
447 static const uint8_t channel_map_b[8][8] = {
454 {0, 1, 2, 3, 4, 5, 6},
455 {0, 1, 2, 3, 4, 5, 6, 7},
457 /* Vorbis mapping family */
459 if (st->codecpar->extradata[19] == st->codecpar->channels - coupled_stream_counts[st->codecpar->channels] &&
460 st->codecpar->extradata[20] == coupled_stream_counts[st->codecpar->channels] &&
461 memcmp(&st->codecpar->extradata[21], channel_map_a[st->codecpar->channels-1], st->codecpar->channels) == 0) {
462 *q++ = st->codecpar->channels;
463 } else if (st->codecpar->channels >= 2 && st->codecpar->extradata[19] == st->codecpar->channels &&
464 st->codecpar->extradata[20] == 0 &&
465 memcmp(&st->codecpar->extradata[21], channel_map_b[st->codecpar->channels-1], st->codecpar->channels) == 0) {
466 *q++ = st->codecpar->channels | 0x80;
468 /* Unsupported, could write an extended descriptor here */
469 av_log(s, AV_LOG_ERROR, "Unsupported Opus Vorbis-style channel mapping");
474 av_log(s, AV_LOG_ERROR, "Unsupported Opus channel mapping for family %d", st->codecpar->extradata[18]);
477 } else if (st->codecpar->channels <= 2) {
478 /* Assume RTP mapping family */
479 *q++ = st->codecpar->channels;
482 av_log(s, AV_LOG_ERROR, "Unsupported Opus channel mapping");
489 char *next = lang->value;
492 *q++ = 0x0a; /* ISO 639 language descriptor */
496 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
497 if (q - data > SECTION_LENGTH - 4) {
501 next = strchr(p, ',');
502 if (strlen(p) != 3 && (!next || next != p + 3))
503 continue; /* not a 3-letter code */
509 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
511 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
513 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
516 *q++ = 0; /* undefined type */
522 q -= 2; /* no language codes were written */
525 case AVMEDIA_TYPE_SUBTITLE:
527 const char default_language[] = "und";
528 const char *language = lang && strlen(lang->value) >= 3 ? lang->value : default_language;
530 if (st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
532 int extradata_copied = 0;
534 *q++ = 0x59; /* subtitling_descriptor */
537 while (strlen(language) >= 3) {
538 if (sizeof(data) - (q - data) < 8) { /* 8 bytes per DVB subtitle substream data */
546 if (*language != '\0')
549 if (st->codecpar->extradata_size - extradata_copied >= 5) {
550 *q++ = st->codecpar->extradata[extradata_copied + 4]; /* subtitling_type */
551 memcpy(q, st->codecpar->extradata + extradata_copied, 4); /* composition_page_id and ancillary_page_id */
552 extradata_copied += 5;
556 * 0x10 - normal with no monitor aspect ratio criticality
557 * 0x20 - for the hard of hearing with no monitor aspect ratio criticality */
558 *q++ = (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED) ? 0x20 : 0x10;
559 if ((st->codecpar->extradata_size == 4) && (extradata_copied == 0)) {
560 /* support of old 4-byte extradata format */
561 memcpy(q, st->codecpar->extradata, 4); /* composition_page_id and ancillary_page_id */
562 extradata_copied += 4;
565 put16(&q, 1); /* composition_page_id */
566 put16(&q, 1); /* ancillary_page_id */
571 *len_ptr = q - len_ptr - 1;
572 } else if (st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
573 uint8_t *len_ptr = NULL;
574 int extradata_copied = 0;
576 /* The descriptor tag. teletext_descriptor */
580 while (strlen(language) >= 3 && q - data < sizeof(data) - 6) {
585 if (*language != '\0')
588 if (st->codecpar->extradata_size - 1 > extradata_copied) {
589 memcpy(q, st->codecpar->extradata + extradata_copied, 2);
590 extradata_copied += 2;
593 /* The Teletext descriptor:
594 * teletext_type: This 5-bit field indicates the type of Teletext page indicated. (0x01 Initial Teletext page)
595 * teletext_magazine_number: This is a 3-bit field which identifies the magazine number.
596 * teletext_page_number: This is an 8-bit field giving two 4-bit hex digits identifying the page number. */
602 *len_ptr = q - len_ptr - 1;
606 case AVMEDIA_TYPE_VIDEO:
607 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
608 put_registration_descriptor(&q, MKTAG('d', 'r', 'a', 'c'));
609 } else if (stream_type == STREAM_TYPE_VIDEO_VC1) {
610 put_registration_descriptor(&q, MKTAG('V', 'C', '-', '1'));
611 } else if (stream_type == STREAM_TYPE_VIDEO_HEVC && s->strict_std_compliance <= FF_COMPLIANCE_NORMAL) {
612 put_registration_descriptor(&q, MKTAG('H', 'E', 'V', 'C'));
615 case AVMEDIA_TYPE_DATA:
616 if (st->codecpar->codec_id == AV_CODEC_ID_SMPTE_KLV) {
617 put_registration_descriptor(&q, MKTAG('K', 'L', 'V', 'A'));
618 } else if (st->codecpar->codec_id == AV_CODEC_ID_TIMED_ID3) {
619 const char *tag = "ID3 ";
620 *q++ = 0x26; /* metadata descriptor */
622 put16(&q, 0xffff); /* metadata application format */
623 putbuf(&q, tag, strlen(tag));
624 *q++ = 0xff; /* metadata format */
625 putbuf(&q, tag, strlen(tag));
626 *q++ = 0; /* metadata service ID */
627 *q++ = 0xF; /* metadata_locator_record_flag|MPEG_carriage_flags|reserved */
632 val = 0xf000 | (q - desc_length_ptr - 2);
633 desc_length_ptr[0] = val >> 8;
634 desc_length_ptr[1] = val;
638 av_log(s, AV_LOG_ERROR,
639 "The PMT section cannot fit stream %d and all following streams.\n"
640 "Try reducing the number of languages in the audio streams "
641 "or the total number of streams.\n", i);
643 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, ts->tables_version, 0, 0,
648 static void mpegts_write_sdt(AVFormatContext *s)
650 MpegTSWrite *ts = s->priv_data;
651 MpegTSService *service;
652 uint8_t data[SECTION_LENGTH], *q, *desc_list_len_ptr, *desc_len_ptr;
653 int i, running_status, free_ca_mode, val;
658 for (i = 0; i < ts->nb_services; i++) {
659 service = ts->services[i];
660 put16(&q, service->sid);
661 *q++ = 0xfc | 0x00; /* currently no EIT info */
662 desc_list_len_ptr = q;
664 running_status = 4; /* running */
667 /* write only one descriptor for the service name and provider */
671 *q++ = ts->service_type;
672 putbuf(&q, service->provider_name, service->provider_name[0] + 1);
673 putbuf(&q, service->name, service->name[0] + 1);
674 desc_len_ptr[0] = q - desc_len_ptr - 1;
676 /* fill descriptor length */
677 val = (running_status << 13) | (free_ca_mode << 12) |
678 (q - desc_list_len_ptr - 2);
679 desc_list_len_ptr[0] = val >> 8;
680 desc_list_len_ptr[1] = val;
682 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, ts->tables_version, 0, 0,
686 /* This stores a string in buf with the correct encoding and also sets the
687 * first byte as the length. !str is accepted for an empty string.
688 * If the string is already encoded, invalid UTF-8 or has no multibyte sequence
689 * then we keep it as is, otherwise we signal UTF-8 encoding. */
690 static int encode_str8(uint8_t *buf, const char *str)
695 str_len = strlen(str);
696 if (str[0] && (unsigned)str[0] >= 0x20) { /* Make sure the string is not already encoded. */
697 const uint8_t *q = str;
698 int has_multibyte = 0;
701 GET_UTF8(code, *q++, goto invalid;) /* Is it valid UTF-8? */
702 has_multibyte |= (code > 127); /* Does it have multibyte UTF-8 chars in it? */
704 if (has_multibyte) { /* If we have multibyte chars and valid UTF-8, then encode as such! */
706 return AVERROR(EINVAL);
707 buf[0] = str_len + 1;
709 memcpy(&buf[2], str, str_len);
714 /* Otherwise let's just encode the string as is! */
716 return AVERROR(EINVAL);
718 memcpy(&buf[1], str, str_len);
722 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
724 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
728 static void write_packet(AVFormatContext *s, const uint8_t *packet)
730 MpegTSWrite *ts = s->priv_data;
732 int64_t pcr = get_pcr(s->priv_data, s->pb);
733 uint32_t tp_extra_header = pcr % 0x3fffffff;
734 tp_extra_header = AV_RB32(&tp_extra_header);
735 avio_write(s->pb, (unsigned char *) &tp_extra_header,
736 sizeof(tp_extra_header));
738 avio_write(s->pb, packet, TS_PACKET_SIZE);
741 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
743 AVFormatContext *ctx = s->opaque;
744 write_packet(ctx, packet);
747 static MpegTSService *mpegts_add_service(AVFormatContext *s, int sid,
748 const AVDictionary *metadata,
751 MpegTSWrite *ts = s->priv_data;
752 MpegTSService *service;
753 AVDictionaryEntry *title, *provider;
754 char default_service_name[32];
755 const char *service_name;
756 const char *provider_name;
758 title = av_dict_get(metadata, "service_name", NULL, 0);
760 title = av_dict_get(metadata, "title", NULL, 0);
761 snprintf(default_service_name, sizeof(default_service_name), "%s%02d", DEFAULT_SERVICE_NAME, ts->nb_services + 1);
762 service_name = title ? title->value : default_service_name;
763 provider = av_dict_get(metadata, "service_provider", NULL, 0);
764 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
766 service = av_mallocz(sizeof(MpegTSService));
769 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
771 service->pcr_pid = 0x1fff;
772 if (encode_str8(service->provider_name, provider_name) < 0 ||
773 encode_str8(service->name, service_name) < 0) {
774 av_log(s, AV_LOG_ERROR, "Too long service or provider name\n");
777 if (av_dynarray_add_nofree(&ts->services, &ts->nb_services, service) < 0)
780 service->pmt.write_packet = section_write_packet;
781 service->pmt.opaque = s;
782 service->pmt.cc = 15;
783 service->pmt.discontinuity= ts->flags & MPEGTS_FLAG_DISCONT;
784 service->program = program;
792 static void enable_pcr_generation_for_stream(AVFormatContext *s, AVStream *pcr_st)
794 MpegTSWrite *ts = s->priv_data;
795 MpegTSWriteStream *ts_st = pcr_st->priv_data;
797 if (ts->mux_rate > 1 || ts->pcr_period_ms >= 0) {
798 int pcr_period_ms = ts->pcr_period_ms == -1 ? PCR_RETRANS_TIME : ts->pcr_period_ms;
799 ts_st->pcr_period = av_rescale(pcr_period_ms, PCR_TIME_BASE, 1000);
801 /* By default, for VBR we select the highest multiple of frame duration which is less than 100 ms. */
802 int64_t frame_period = 0;
803 if (pcr_st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
804 int frame_size = av_get_audio_frame_duration2(pcr_st->codecpar, 0);
806 av_log(s, AV_LOG_WARNING, "frame size not set\n");
809 frame_period = av_rescale_rnd(frame_size, PCR_TIME_BASE, pcr_st->codecpar->sample_rate, AV_ROUND_UP);
810 } else if (pcr_st->avg_frame_rate.num) {
811 frame_period = av_rescale_rnd(pcr_st->avg_frame_rate.den, PCR_TIME_BASE, pcr_st->avg_frame_rate.num, AV_ROUND_UP);
813 if (frame_period > 0 && frame_period <= PCR_TIME_BASE / 10)
814 ts_st->pcr_period = frame_period * (PCR_TIME_BASE / 10 / frame_period);
816 ts_st->pcr_period = 1;
819 // output a PCR as soon as possible
820 ts_st->last_pcr = ts->first_pcr - ts_st->pcr_period;
823 static void select_pcr_streams(AVFormatContext *s)
825 MpegTSWrite *ts = s->priv_data;
827 for (int i = 0; i < ts->nb_services; i++) {
828 MpegTSService *service = ts->services[i];
829 AVStream *pcr_st = NULL;
830 AVProgram *program = service->program;
831 int nb_streams = program ? program->nb_stream_indexes : s->nb_streams;
833 for (int j = 0; j < nb_streams; j++) {
834 AVStream *st = s->streams[program ? program->stream_index[j] : j];
836 pcr_st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO && st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
843 MpegTSWriteStream *ts_st = pcr_st->priv_data;
844 service->pcr_pid = ts_st->pid;
845 enable_pcr_generation_for_stream(s, pcr_st);
846 av_log(s, AV_LOG_VERBOSE, "service %i using PCR in pid=%i, pcr_period=%"PRId64"ms\n",
847 service->sid, service->pcr_pid, av_rescale(ts_st->pcr_period, 1000, PCR_TIME_BASE));
852 static int mpegts_init(AVFormatContext *s)
854 MpegTSWrite *ts = s->priv_data;
859 if (ts->m2ts_mode == -1) {
860 if (av_match_ext(s->url, "m2ts")) {
867 ts->m2ts_video_pid = M2TS_VIDEO_PID;
868 ts->m2ts_audio_pid = M2TS_AUDIO_START_PID;
869 ts->m2ts_pgssub_pid = M2TS_PGSSUB_START_PID;
870 ts->m2ts_textsub_pid = M2TS_TEXTSUB_PID;
873 ts->pmt_start_pid = M2TS_PMT_PID;
874 if (s->nb_programs > 1) {
875 av_log(s, AV_LOG_ERROR, "Only one program is allowed in m2ts mode!\n");
876 return AVERROR(EINVAL);
880 if (s->max_delay < 0) /* Not set by the caller */
883 // round up to a whole number of TS packets
884 ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
886 ts->tsid = ts->transport_stream_id;
887 ts->onid = ts->original_network_id;
888 if (!s->nb_programs) {
889 /* allocate a single DVB service */
890 if (!mpegts_add_service(s, ts->service_id, s->metadata, NULL))
891 return AVERROR(ENOMEM);
893 for (i = 0; i < s->nb_programs; i++) {
894 AVProgram *program = s->programs[i];
895 if (!mpegts_add_service(s, program->id, program->metadata, program))
896 return AVERROR(ENOMEM);
900 ts->pat.pid = PAT_PID;
901 /* Initialize at 15 so that it wraps and is equal to 0 for the
902 * first packet we write. */
904 ts->pat.discontinuity= ts->flags & MPEGTS_FLAG_DISCONT;
905 ts->pat.write_packet = section_write_packet;
908 ts->sdt.pid = SDT_PID;
910 ts->sdt.discontinuity= ts->flags & MPEGTS_FLAG_DISCONT;
911 ts->sdt.write_packet = section_write_packet;
914 pids = av_malloc_array(s->nb_streams, sizeof(*pids));
916 ret = AVERROR(ENOMEM);
920 /* assign pids to each stream */
921 for (i = 0; i < s->nb_streams; i++) {
922 AVStream *st = s->streams[i];
923 MpegTSWriteStream *ts_st;
925 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
927 ret = AVERROR(ENOMEM);
930 st->priv_data = ts_st;
932 avpriv_set_pts_info(st, 33, 1, 90000);
934 ts_st->payload = av_mallocz(ts->pes_payload_size);
935 if (!ts_st->payload) {
936 ret = AVERROR(ENOMEM);
940 /* MPEG pid values < 16 are reserved. Applications which set st->id in
941 * this range are assigned a calculated pid. */
944 switch (st->codecpar->codec_type) {
945 case AVMEDIA_TYPE_VIDEO:
946 ts_st->pid = ts->m2ts_video_pid++;
948 case AVMEDIA_TYPE_AUDIO:
949 ts_st->pid = ts->m2ts_audio_pid++;
951 case AVMEDIA_TYPE_SUBTITLE:
952 switch (st->codecpar->codec_id) {
953 case AV_CODEC_ID_HDMV_PGS_SUBTITLE:
954 ts_st->pid = ts->m2ts_pgssub_pid++;
956 case AV_CODEC_ID_HDMV_TEXT_SUBTITLE:
957 ts_st->pid = ts->m2ts_textsub_pid++;
962 if (ts->m2ts_video_pid > M2TS_VIDEO_PID + 1 ||
963 ts->m2ts_audio_pid > M2TS_AUDIO_START_PID + 32 ||
964 ts->m2ts_pgssub_pid > M2TS_PGSSUB_START_PID + 32 ||
965 ts->m2ts_textsub_pid > M2TS_TEXTSUB_PID + 1 ||
967 av_log(s, AV_LOG_ERROR, "Cannot automatically assign PID for stream %d\n", st->index);
968 ret = AVERROR(EINVAL);
972 ts_st->pid = ts->start_pid + i;
977 if (ts_st->pid >= 0x1FFF) {
978 av_log(s, AV_LOG_ERROR,
979 "Invalid stream id %d, must be less than 8191\n", st->id);
980 ret = AVERROR(EINVAL);
983 for (j = 0; j < ts->nb_services; j++) {
984 if (ts->services[j]->pmt.pid > LAST_OTHER_PID) {
985 av_log(s, AV_LOG_ERROR,
986 "Invalid PMT PID %d, must be less than %d\n", ts->services[j]->pmt.pid, LAST_OTHER_PID + 1);
987 ret = AVERROR(EINVAL);
990 if (ts_st->pid == ts->services[j]->pmt.pid) {
991 av_log(s, AV_LOG_ERROR, "PID %d cannot be both elementary and PMT PID\n", ts_st->pid);
992 ret = AVERROR(EINVAL);
996 for (j = 0; j < i; j++) {
997 if (pids[j] == ts_st->pid) {
998 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
999 ret = AVERROR(EINVAL);
1003 pids[i] = ts_st->pid;
1004 ts_st->payload_pts = AV_NOPTS_VALUE;
1005 ts_st->payload_dts = AV_NOPTS_VALUE;
1006 ts_st->first_pts_check = 1;
1008 ts_st->discontinuity = ts->flags & MPEGTS_FLAG_DISCONT;
1009 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1010 st->codecpar->extradata_size > 0) {
1012 ts_st->amux = avformat_alloc_context();
1014 ret = AVERROR(ENOMEM);
1017 ts_st->amux->oformat =
1018 av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts",
1020 if (!ts_st->amux->oformat) {
1021 ret = AVERROR(EINVAL);
1024 if (!(ast = avformat_new_stream(ts_st->amux, NULL))) {
1025 ret = AVERROR(ENOMEM);
1028 ret = avcodec_parameters_copy(ast->codecpar, st->codecpar);
1031 ast->time_base = st->time_base;
1032 ret = avformat_write_header(ts_st->amux, NULL);
1036 if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
1037 ts_st->opus_pending_trim_start = st->codecpar->initial_padding * 48000 / st->codecpar->sample_rate;
1044 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
1046 select_pcr_streams(s);
1048 ts->last_pat_ts = AV_NOPTS_VALUE;
1049 ts->last_sdt_ts = AV_NOPTS_VALUE;
1050 ts->pat_period = av_rescale(ts->pat_period_us, PCR_TIME_BASE, AV_TIME_BASE);
1051 ts->sdt_period = av_rescale(ts->sdt_period_us, PCR_TIME_BASE, AV_TIME_BASE);
1053 if (ts->mux_rate == 1)
1054 av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
1056 av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
1057 av_log(s, AV_LOG_VERBOSE,
1058 "sdt every %"PRId64" ms, pat/pmt every %"PRId64" ms\n",
1059 av_rescale(ts->sdt_period, 1000, PCR_TIME_BASE),
1060 av_rescale(ts->pat_period, 1000, PCR_TIME_BASE));
1069 /* send SDT, PAT and PMT tables regularly */
1070 static void retransmit_si_info(AVFormatContext *s, int force_pat, int force_sdt, int64_t pcr)
1072 MpegTSWrite *ts = s->priv_data;
1075 if ((pcr != AV_NOPTS_VALUE && ts->last_sdt_ts == AV_NOPTS_VALUE) ||
1076 (pcr != AV_NOPTS_VALUE && pcr - ts->last_sdt_ts >= ts->sdt_period) ||
1079 if (pcr != AV_NOPTS_VALUE)
1080 ts->last_sdt_ts = FFMAX(pcr, ts->last_sdt_ts);
1081 mpegts_write_sdt(s);
1083 if ((pcr != AV_NOPTS_VALUE && ts->last_pat_ts == AV_NOPTS_VALUE) ||
1084 (pcr != AV_NOPTS_VALUE && pcr - ts->last_pat_ts >= ts->pat_period) ||
1086 if (pcr != AV_NOPTS_VALUE)
1087 ts->last_pat_ts = FFMAX(pcr, ts->last_pat_ts);
1088 mpegts_write_pat(s);
1089 for (i = 0; i < ts->nb_services; i++)
1090 mpegts_write_pmt(s, ts->services[i]);
1094 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
1096 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
1098 *buf++ = pcr_high >> 25;
1099 *buf++ = pcr_high >> 17;
1100 *buf++ = pcr_high >> 9;
1101 *buf++ = pcr_high >> 1;
1102 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
1108 /* Write a single null transport stream packet */
1109 static void mpegts_insert_null_packet(AVFormatContext *s)
1112 uint8_t buf[TS_PACKET_SIZE];
1119 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
1120 write_packet(s, buf);
1123 /* Write a single transport stream packet with a PCR and no payload */
1124 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
1126 MpegTSWrite *ts = s->priv_data;
1127 MpegTSWriteStream *ts_st = st->priv_data;
1129 uint8_t buf[TS_PACKET_SIZE];
1133 *q++ = ts_st->pid >> 8;
1135 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
1136 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
1137 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
1138 *q++ = 0x10; /* Adaptation flags: PCR present */
1139 if (ts_st->discontinuity) {
1141 ts_st->discontinuity = 0;
1144 /* PCR coded into 6 bytes */
1145 q += write_pcr_bits(q, get_pcr(ts, s->pb));
1147 /* stuffing bytes */
1148 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
1149 write_packet(s, buf);
1152 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
1156 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
1158 val = (((pts >> 15) & 0x7fff) << 1) | 1;
1161 val = (((pts) & 0x7fff) << 1) | 1;
1166 /* Set an adaptation field flag in an MPEG-TS packet*/
1167 static void set_af_flag(uint8_t *pkt, int flag)
1169 // expect at least one flag to set
1172 if ((pkt[3] & 0x20) == 0) {
1173 // no AF yet, set adaptation field flag
1175 // 1 byte length, no flags
1182 /* Extend the adaptation field by size bytes */
1183 static void extend_af(uint8_t *pkt, int size)
1185 // expect already existing adaptation field
1186 av_assert0(pkt[3] & 0x20);
1190 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
1191 static uint8_t *get_ts_payload_start(uint8_t *pkt)
1194 return pkt + 5 + pkt[4];
1199 /* Add a PES header to the front of the payload, and segment into an integer
1200 * number of TS packets. The final TS packet is padded using an oversized
1201 * adaptation header to exactly fill the last TS packet.
1202 * NOTE: 'payload' contains a complete PES payload. */
1203 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
1204 const uint8_t *payload, int payload_size,
1205 int64_t pts, int64_t dts, int key, int stream_id)
1207 MpegTSWriteStream *ts_st = st->priv_data;
1208 MpegTSWrite *ts = s->priv_data;
1209 uint8_t buf[TS_PACKET_SIZE];
1211 int val, is_start, len, header_len, write_pcr, is_dvb_subtitle, is_dvb_teletext, flags;
1212 int afc_len, stuffing_len;
1213 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
1214 int force_pat = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key;
1217 av_assert0(ts_st->payload != buf || st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO);
1218 if (ts->flags & MPEGTS_FLAG_PAT_PMT_AT_FRAMES && st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
1222 if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
1225 ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
1229 while (payload_size > 0) {
1230 int64_t pcr = AV_NOPTS_VALUE;
1231 if (ts->mux_rate > 1)
1232 pcr = get_pcr(ts, s->pb);
1233 else if (dts != AV_NOPTS_VALUE)
1234 pcr = (dts - delay) * 300;
1236 retransmit_si_info(s, force_pat, force_sdt, pcr);
1241 if (ts->mux_rate > 1) {
1242 /* Send PCR packets for all PCR streams if needed */
1243 pcr = get_pcr(ts, s->pb);
1244 if (pcr >= ts->next_pcr) {
1245 int64_t next_pcr = INT64_MAX;
1246 for (int i = 0; i < s->nb_streams; i++) {
1247 /* Make the current stream the last, because for that we
1248 * can insert the pcr into the payload later */
1249 int st2_index = i < st->index ? i : (i + 1 == s->nb_streams ? st->index : i + 1);
1250 AVStream *st2 = s->streams[st2_index];
1251 MpegTSWriteStream *ts_st2 = st2->priv_data;
1252 if (ts_st2->pcr_period) {
1253 if (pcr - ts_st2->last_pcr >= ts_st2->pcr_period) {
1254 ts_st2->last_pcr = FFMAX(pcr - ts_st2->pcr_period, ts_st2->last_pcr + ts_st2->pcr_period);
1256 mpegts_insert_pcr_only(s, st2);
1257 pcr = get_pcr(ts, s->pb);
1262 next_pcr = FFMIN(next_pcr, ts_st2->last_pcr + ts_st2->pcr_period);
1265 ts->next_pcr = next_pcr;
1267 if (dts != AV_NOPTS_VALUE && (dts - pcr / 300) > delay) {
1268 /* pcr insert gets priority over null packet insert */
1270 mpegts_insert_pcr_only(s, st);
1272 mpegts_insert_null_packet(s);
1273 /* recalculate write_pcr and possibly retransmit si_info */
1276 } else if (ts_st->pcr_period && pcr != AV_NOPTS_VALUE) {
1277 if (pcr - ts_st->last_pcr >= ts_st->pcr_period && is_start) {
1278 ts_st->last_pcr = FFMAX(pcr - ts_st->pcr_period, ts_st->last_pcr + ts_st->pcr_period);
1283 /* prepare packet header */
1286 val = ts_st->pid >> 8;
1287 if (ts->m2ts_mode && st->codecpar->codec_id == AV_CODEC_ID_AC3)
1293 ts_st->cc = ts_st->cc + 1 & 0xf;
1294 *q++ = 0x10 | ts_st->cc; // payload indicator + CC
1295 if (ts_st->discontinuity) {
1296 set_af_flag(buf, 0x80);
1297 q = get_ts_payload_start(buf);
1298 ts_st->discontinuity = 0;
1300 if (key && is_start && pts != AV_NOPTS_VALUE) {
1301 // set Random Access for key frames
1302 if (ts_st->pcr_period)
1304 set_af_flag(buf, 0x40);
1305 q = get_ts_payload_start(buf);
1308 set_af_flag(buf, 0x10);
1309 q = get_ts_payload_start(buf);
1310 // add 11, pcr references the last byte of program clock reference base
1311 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
1312 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
1313 extend_af(buf, write_pcr_bits(q, pcr));
1314 q = get_ts_payload_start(buf);
1317 int pes_extension = 0;
1318 int pes_header_stuffing_bytes = 0;
1319 /* write PES header */
1323 is_dvb_subtitle = 0;
1324 is_dvb_teletext = 0;
1325 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
1326 if (st->codecpar->codec_id == AV_CODEC_ID_DIRAC)
1330 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
1331 (st->codecpar->codec_id == AV_CODEC_ID_MP2 ||
1332 st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
1333 st->codecpar->codec_id == AV_CODEC_ID_AAC)) {
1335 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
1336 st->codecpar->codec_id == AV_CODEC_ID_AC3 &&
1339 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA &&
1340 st->codecpar->codec_id == AV_CODEC_ID_TIMED_ID3) {
1342 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA) {
1343 *q++ = stream_id != -1 ? stream_id : 0xfc;
1345 if (stream_id == 0xbd) /* asynchronous KLV */
1346 pts = dts = AV_NOPTS_VALUE;
1349 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) {
1350 if (st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
1351 is_dvb_subtitle = 1;
1352 } else if (st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1353 is_dvb_teletext = 1;
1359 if (pts != AV_NOPTS_VALUE) {
1363 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
1367 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
1368 st->codecpar->codec_id == AV_CODEC_ID_DIRAC) {
1369 /* set PES_extension_flag */
1373 /* One byte for PES2 extension flag +
1374 * one byte for extension length +
1375 * one byte for extension id */
1378 /* for Blu-ray AC3 Audio the PES Extension flag should be as follow
1379 * otherwise it will not play sound on blu-ray
1381 if (ts->m2ts_mode &&
1382 st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
1383 st->codecpar->codec_id == AV_CODEC_ID_AC3) {
1384 /* set PES_extension_flag */
1389 if (is_dvb_teletext) {
1390 pes_header_stuffing_bytes = 0x24 - header_len;
1393 len = payload_size + header_len + 3;
1394 /* 3 extra bytes should be added to DVB subtitle payload: 0x20 0x00 at the beginning and trailing 0xff */
1395 if (is_dvb_subtitle) {
1401 if (ts->omit_video_pes_length && st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
1407 /* data alignment indicator is required for subtitle and data streams */
1408 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE || st->codecpar->codec_type == AVMEDIA_TYPE_DATA)
1413 if (pts != AV_NOPTS_VALUE) {
1414 write_pts(q, flags >> 6, pts);
1417 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
1418 write_pts(q, 1, dts);
1421 if (pes_extension && st->codecpar->codec_id == AV_CODEC_ID_DIRAC) {
1422 flags = 0x01; /* set PES_extension_flag_2 */
1424 *q++ = 0x80 | 0x01; /* marker bit + extension length */
1425 /* Set the stream ID extension flag bit to 0 and
1426 * write the extended stream ID. */
1429 /* For Blu-ray AC3 Audio Setting extended flags */
1430 if (ts->m2ts_mode &&
1432 st->codecpar->codec_id == AV_CODEC_ID_AC3) {
1433 flags = 0x01; /* set PES_extension_flag_2 */
1435 *q++ = 0x80 | 0x01; /* marker bit + extension length */
1436 *q++ = 0x00 | 0x71; /* for AC3 Audio (specifically on blue-rays) */
1440 if (is_dvb_subtitle) {
1441 /* First two fields of DVB subtitles PES data:
1442 * data_identifier: for DVB subtitle streams shall be coded with the value 0x20
1443 * subtitle_stream_id: for DVB subtitle stream shall be identified by the value 0x00 */
1447 if (is_dvb_teletext) {
1448 memset(q, 0xff, pes_header_stuffing_bytes);
1449 q += pes_header_stuffing_bytes;
1454 header_len = q - buf;
1456 len = TS_PACKET_SIZE - header_len;
1457 if (len > payload_size)
1459 stuffing_len = TS_PACKET_SIZE - header_len - len;
1460 if (stuffing_len > 0) {
1461 /* add stuffing with AFC */
1462 if (buf[3] & 0x20) {
1463 /* stuffing already present: increase its size */
1464 afc_len = buf[4] + 1;
1465 memmove(buf + 4 + afc_len + stuffing_len,
1467 header_len - (4 + afc_len));
1468 buf[4] += stuffing_len;
1469 memset(buf + 4 + afc_len, 0xff, stuffing_len);
1472 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
1474 buf[4] = stuffing_len - 1;
1475 if (stuffing_len >= 2) {
1477 memset(buf + 6, 0xff, stuffing_len - 2);
1482 if (is_dvb_subtitle && payload_size == len) {
1483 memcpy(buf + TS_PACKET_SIZE - len, payload, len - 1);
1484 buf[TS_PACKET_SIZE - 1] = 0xff; /* end_of_PES_data_field_marker: an 8-bit field with fixed contents 0xff for DVB subtitle */
1486 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
1490 payload_size -= len;
1491 write_packet(s, buf);
1493 ts_st->prev_payload_key = key;
1496 int ff_check_h264_startcode(AVFormatContext *s, const AVStream *st, const AVPacket *pkt)
1498 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001 && AV_RB24(pkt->data) != 0x000001) {
1499 if (!st->nb_frames) {
1500 av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
1501 "no startcode found, use the video bitstream filter 'h264_mp4toannexb' to fix it "
1502 "('-bsf:v h264_mp4toannexb' option with ffmpeg)\n");
1503 return AVERROR_INVALIDDATA;
1505 av_log(s, AV_LOG_WARNING, "H.264 bitstream error, startcode missing, size %d", pkt->size);
1507 av_log(s, AV_LOG_WARNING, " data %08"PRIX32, AV_RB32(pkt->data));
1508 av_log(s, AV_LOG_WARNING, "\n");
1513 static int check_hevc_startcode(AVFormatContext *s, const AVStream *st, const AVPacket *pkt)
1515 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001 && AV_RB24(pkt->data) != 0x000001) {
1516 if (!st->nb_frames) {
1517 av_log(s, AV_LOG_ERROR, "HEVC bitstream malformed, no startcode found\n");
1518 return AVERROR_PATCHWELCOME;
1520 av_log(s, AV_LOG_WARNING, "HEVC bitstream error, startcode missing, size %d", pkt->size);
1522 av_log(s, AV_LOG_WARNING, " data %08"PRIX32, AV_RB32(pkt->data));
1523 av_log(s, AV_LOG_WARNING, "\n");
1528 /* Based on GStreamer's gst-plugins-base/ext/ogg/gstoggstream.c
1529 * Released under the LGPL v2.1+, written by
1530 * Vincent Penquerc'h <vincent.penquerch@collabora.co.uk>
1532 static int opus_get_packet_samples(AVFormatContext *s, AVPacket *pkt)
1534 static const int durations[32] = {
1535 480, 960, 1920, 2880, /* Silk NB */
1536 480, 960, 1920, 2880, /* Silk MB */
1537 480, 960, 1920, 2880, /* Silk WB */
1538 480, 960, /* Hybrid SWB */
1539 480, 960, /* Hybrid FB */
1540 120, 240, 480, 960, /* CELT NB */
1541 120, 240, 480, 960, /* CELT NB */
1542 120, 240, 480, 960, /* CELT NB */
1543 120, 240, 480, 960, /* CELT NB */
1545 int toc, frame_duration, nframes, duration;
1552 frame_duration = durations[toc >> 3];
1566 nframes = pkt->data[1] & 63;
1570 duration = nframes * frame_duration;
1571 if (duration > 5760) {
1572 av_log(s, AV_LOG_WARNING,
1573 "Opus packet duration > 120 ms, invalid");
1580 static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1582 AVStream *st = s->streams[pkt->stream_index];
1583 int size = pkt->size;
1584 uint8_t *buf = pkt->data;
1585 uint8_t *data = NULL;
1586 MpegTSWrite *ts = s->priv_data;
1587 MpegTSWriteStream *ts_st = st->priv_data;
1588 const int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE) * 2;
1589 const int64_t max_audio_delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE) / 2;
1590 int64_t dts = pkt->dts, pts = pkt->pts;
1591 int opus_samples = 0;
1593 uint8_t *side_data = NULL;
1596 side_data = av_packet_get_side_data(pkt,
1597 AV_PKT_DATA_MPEGTS_STREAM_ID,
1600 stream_id = side_data[0];
1602 if (ts->copyts < 1) {
1603 if (pts != AV_NOPTS_VALUE)
1605 if (dts != AV_NOPTS_VALUE)
1609 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
1610 av_log(s, AV_LOG_ERROR, "first pts value must be set\n");
1611 return AVERROR_INVALIDDATA;
1613 ts_st->first_pts_check = 0;
1615 if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
1616 const uint8_t *p = buf, *buf_end = p + size;
1617 uint32_t state = -1;
1618 int extradd = (pkt->flags & AV_PKT_FLAG_KEY) ? st->codecpar->extradata_size : 0;
1619 int ret = ff_check_h264_startcode(s, st, pkt);
1623 if (extradd && AV_RB24(st->codecpar->extradata) > 1)
1627 p = avpriv_find_start_code(p, buf_end, &state);
1628 av_log(s, AV_LOG_TRACE, "nal %"PRId32"\n", state & 0x1f);
1629 if ((state & 0x1f) == 7)
1631 } while (p < buf_end && (state & 0x1f) != 9 &&
1632 (state & 0x1f) != 5 && (state & 0x1f) != 1);
1634 if ((state & 0x1f) != 5)
1636 if ((state & 0x1f) != 9) { // AUD NAL
1637 data = av_malloc(pkt->size + 6 + extradd);
1639 return AVERROR(ENOMEM);
1640 memcpy(data + 6, st->codecpar->extradata, extradd);
1641 memcpy(data + 6 + extradd, pkt->data, pkt->size);
1642 AV_WB32(data, 0x00000001);
1644 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1646 size = pkt->size + 6 + extradd;
1648 } else if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
1649 if (pkt->size < 2) {
1650 av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
1651 return AVERROR_INVALIDDATA;
1653 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
1658 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
1659 "and extradata missing\n");
1661 av_init_packet(&pkt2);
1662 pkt2.data = pkt->data;
1663 pkt2.size = pkt->size;
1664 av_assert0(pkt->dts != AV_NOPTS_VALUE);
1665 pkt2.dts = av_rescale_q(pkt->dts, st->time_base, ts_st->amux->streams[0]->time_base);
1667 ret = avio_open_dyn_buf(&ts_st->amux->pb);
1671 ret = av_write_frame(ts_st->amux, &pkt2);
1673 ffio_free_dyn_buf(&ts_st->amux->pb);
1676 size = avio_close_dyn_buf(ts_st->amux->pb, &data);
1677 ts_st->amux->pb = NULL;
1681 } else if (st->codecpar->codec_id == AV_CODEC_ID_HEVC) {
1682 const uint8_t *p = buf, *buf_end = p + size;
1683 uint32_t state = -1;
1684 int extradd = (pkt->flags & AV_PKT_FLAG_KEY) ? st->codecpar->extradata_size : 0;
1685 int ret = check_hevc_startcode(s, st, pkt);
1689 if (extradd && AV_RB24(st->codecpar->extradata) > 1)
1693 p = avpriv_find_start_code(p, buf_end, &state);
1694 av_log(s, AV_LOG_TRACE, "nal %"PRId32"\n", (state & 0x7e)>>1);
1695 if ((state & 0x7e) == 2*32)
1697 } while (p < buf_end && (state & 0x7e) != 2*35 &&
1698 (state & 0x7e) >= 2*32);
1700 if ((state & 0x7e) < 2*16 || (state & 0x7e) >= 2*24)
1702 if ((state & 0x7e) != 2*35) { // AUD NAL
1703 data = av_malloc(pkt->size + 7 + extradd);
1705 return AVERROR(ENOMEM);
1706 memcpy(data + 7, st->codecpar->extradata, extradd);
1707 memcpy(data + 7 + extradd, pkt->data, pkt->size);
1708 AV_WB32(data, 0x00000001);
1711 data[6] = 0x50; // any slice type (0x4) + rbsp stop one bit
1713 size = pkt->size + 7 + extradd;
1715 } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
1716 if (pkt->size < 2) {
1717 av_log(s, AV_LOG_ERROR, "Opus packet too short\n");
1718 return AVERROR_INVALIDDATA;
1721 /* Add Opus control header */
1722 if ((AV_RB16(pkt->data) >> 5) != 0x3ff) {
1726 int ctrl_header_size;
1727 int trim_start = 0, trim_end = 0;
1729 opus_samples = opus_get_packet_samples(s, pkt);
1731 side_data = av_packet_get_side_data(pkt,
1732 AV_PKT_DATA_SKIP_SAMPLES,
1735 if (side_data && side_data_size >= 10) {
1736 trim_end = AV_RL32(side_data + 4) * 48000 / st->codecpar->sample_rate;
1739 ctrl_header_size = pkt->size + 2 + pkt->size / 255 + 1;
1740 if (ts_st->opus_pending_trim_start)
1741 ctrl_header_size += 2;
1743 ctrl_header_size += 2;
1745 data = av_malloc(ctrl_header_size);
1747 return AVERROR(ENOMEM);
1751 if (ts_st->opus_pending_trim_start)
1759 data[i] = FFMIN(n, 255);
1764 av_assert0(2 + pkt->size / 255 + 1 == i);
1766 if (ts_st->opus_pending_trim_start) {
1767 trim_start = FFMIN(ts_st->opus_pending_trim_start, opus_samples);
1768 AV_WB16(data + i, trim_start);
1770 ts_st->opus_pending_trim_start -= trim_start;
1773 trim_end = FFMIN(trim_end, opus_samples - trim_start);
1774 AV_WB16(data + i, trim_end);
1778 memcpy(data + i, pkt->data, pkt->size);
1780 size = ctrl_header_size;
1782 /* TODO: Can we get TS formatted data here? If so we will
1783 * need to count the samples of that too! */
1784 av_log(s, AV_LOG_WARNING, "Got MPEG-TS formatted Opus data, unhandled");
1788 if (ts_st->payload_size && (ts_st->payload_size + size > ts->pes_payload_size ||
1789 (dts != AV_NOPTS_VALUE && ts_st->payload_dts != AV_NOPTS_VALUE &&
1790 dts - ts_st->payload_dts >= max_audio_delay) ||
1791 ts_st->opus_queued_samples + opus_samples >= 5760 /* 120ms */)) {
1792 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1793 ts_st->payload_pts, ts_st->payload_dts,
1794 ts_st->payload_flags & AV_PKT_FLAG_KEY, stream_id);
1795 ts_st->payload_size = 0;
1796 ts_st->opus_queued_samples = 0;
1799 if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO || size > ts->pes_payload_size) {
1800 av_assert0(!ts_st->payload_size);
1801 // for video and subtitle, write a single pes packet
1802 mpegts_write_pes(s, st, buf, size, pts, dts,
1803 pkt->flags & AV_PKT_FLAG_KEY, stream_id);
1804 ts_st->opus_queued_samples = 0;
1809 if (!ts_st->payload_size) {
1810 ts_st->payload_pts = pts;
1811 ts_st->payload_dts = dts;
1812 ts_st->payload_flags = pkt->flags;
1815 memcpy(ts_st->payload + ts_st->payload_size, buf, size);
1816 ts_st->payload_size += size;
1817 ts_st->opus_queued_samples += opus_samples;
1824 static void mpegts_write_flush(AVFormatContext *s)
1826 MpegTSWrite *ts = s->priv_data;
1829 /* flush current packets */
1830 for (i = 0; i < s->nb_streams; i++) {
1831 AVStream *st = s->streams[i];
1832 MpegTSWriteStream *ts_st = st->priv_data;
1833 if (ts_st->payload_size > 0) {
1834 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1835 ts_st->payload_pts, ts_st->payload_dts,
1836 ts_st->payload_flags & AV_PKT_FLAG_KEY, -1);
1837 ts_st->payload_size = 0;
1838 ts_st->opus_queued_samples = 0;
1842 if (ts->m2ts_mode) {
1843 int packets = (avio_tell(s->pb) / (TS_PACKET_SIZE + 4)) % 32;
1844 while (packets++ < 32)
1845 mpegts_insert_null_packet(s);
1849 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
1852 mpegts_write_flush(s);
1855 return mpegts_write_packet_internal(s, pkt);
1859 static int mpegts_write_end(AVFormatContext *s)
1862 mpegts_write_flush(s);
1867 static void mpegts_deinit(AVFormatContext *s)
1869 MpegTSWrite *ts = s->priv_data;
1870 MpegTSService *service;
1873 for (i = 0; i < s->nb_streams; i++) {
1874 AVStream *st = s->streams[i];
1875 MpegTSWriteStream *ts_st = st->priv_data;
1877 av_freep(&ts_st->payload);
1879 avformat_free_context(ts_st->amux);
1885 for (i = 0; i < ts->nb_services; i++) {
1886 service = ts->services[i];
1889 av_freep(&ts->services);
1892 static int mpegts_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
1895 AVStream *st = s->streams[pkt->stream_index];
1897 if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
1898 if (pkt->size >= 5 && AV_RB32(pkt->data) != 0x0000001 &&
1899 (AV_RB24(pkt->data) != 0x000001 ||
1900 (st->codecpar->extradata_size > 0 &&
1901 st->codecpar->extradata[0] == 1)))
1902 ret = ff_stream_add_bitstream_filter(st, "h264_mp4toannexb", NULL);
1903 } else if (st->codecpar->codec_id == AV_CODEC_ID_HEVC) {
1904 if (pkt->size >= 5 && AV_RB32(pkt->data) != 0x0000001 &&
1905 (AV_RB24(pkt->data) != 0x000001 ||
1906 (st->codecpar->extradata_size > 0 &&
1907 st->codecpar->extradata[0] == 1)))
1908 ret = ff_stream_add_bitstream_filter(st, "hevc_mp4toannexb", NULL);
1914 static const AVOption options[] = {
1915 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
1916 offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT,
1917 { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1918 { "mpegts_original_network_id", "Set original_network_id field.",
1919 offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT,
1920 { .i64 = DVB_PRIVATE_NETWORK_START }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1921 { "mpegts_service_id", "Set service_id field.",
1922 offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT,
1923 { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1924 { "mpegts_service_type", "Set service_type field.",
1925 offsetof(MpegTSWrite, service_type), AV_OPT_TYPE_INT,
1926 { .i64 = 0x01 }, 0x01, 0xff, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" },
1927 { "digital_tv", "Digital Television.",
1928 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_DIGITAL_TV }, 0x01, 0xff,
1929 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" },
1930 { "digital_radio", "Digital Radio.",
1931 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_DIGITAL_RADIO }, 0x01, 0xff,
1932 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" },
1933 { "teletext", "Teletext.",
1934 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_TELETEXT }, 0x01, 0xff,
1935 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" },
1936 { "advanced_codec_digital_radio", "Advanced Codec Digital Radio.",
1937 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_RADIO }, 0x01, 0xff,
1938 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" },
1939 { "mpeg2_digital_hdtv", "MPEG2 Digital HDTV.",
1940 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_MPEG2_DIGITAL_HDTV }, 0x01, 0xff,
1941 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" },
1942 { "advanced_codec_digital_sdtv", "Advanced Codec Digital SDTV.",
1943 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_SDTV }, 0x01, 0xff,
1944 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" },
1945 { "advanced_codec_digital_hdtv", "Advanced Codec Digital HDTV.",
1946 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_HDTV }, 0x01, 0xff,
1947 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" },
1948 { "hevc_digital_hdtv", "HEVC Digital Television Service.",
1949 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_HEVC_DIGITAL_HDTV }, 0x01, 0xff,
1950 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" },
1951 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
1952 offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT,
1953 { .i64 = 0x1000 }, FIRST_OTHER_PID, LAST_OTHER_PID, AV_OPT_FLAG_ENCODING_PARAM },
1954 { "mpegts_start_pid", "Set the first pid.",
1955 offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT,
1956 { .i64 = 0x0100 }, FIRST_OTHER_PID, LAST_OTHER_PID, AV_OPT_FLAG_ENCODING_PARAM },
1957 { "mpegts_m2ts_mode", "Enable m2ts mode.",
1958 offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_BOOL,
1959 { .i64 = -1 }, -1, 1, AV_OPT_FLAG_ENCODING_PARAM },
1961 offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT,
1962 { .i64 = 1 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1963 { "pes_payload_size", "Minimum PES packet payload in bytes",
1964 offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT,
1965 { .i64 = DEFAULT_PES_PAYLOAD_SIZE }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1966 { "mpegts_flags", "MPEG-TS muxing flags",
1967 offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, 0, INT_MAX,
1968 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1969 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1970 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_REEMIT_PAT_PMT }, 0, INT_MAX,
1971 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1972 { "latm", "Use LATM packetization for AAC",
1973 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_AAC_LATM }, 0, INT_MAX,
1974 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1975 { "pat_pmt_at_frames", "Reemit PAT and PMT at each video frame",
1976 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_PAT_PMT_AT_FRAMES}, 0, INT_MAX,
1977 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1978 { "system_b", "Conform to System B (DVB) instead of System A (ATSC)",
1979 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_SYSTEM_B }, 0, INT_MAX,
1980 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1981 { "initial_discontinuity", "Mark initial packets as discontinuous",
1982 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_DISCONT }, 0, INT_MAX,
1983 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1984 { "mpegts_copyts", "don't offset dts/pts",
1985 offsetof(MpegTSWrite, copyts), AV_OPT_TYPE_BOOL,
1986 { .i64 = -1 }, -1, 1, AV_OPT_FLAG_ENCODING_PARAM },
1987 { "tables_version", "set PAT, PMT and SDT version",
1988 offsetof(MpegTSWrite, tables_version), AV_OPT_TYPE_INT,
1989 { .i64 = 0 }, 0, 31, AV_OPT_FLAG_ENCODING_PARAM },
1990 { "omit_video_pes_length", "Omit the PES packet length for video packets",
1991 offsetof(MpegTSWrite, omit_video_pes_length), AV_OPT_TYPE_BOOL,
1992 { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
1993 { "pcr_period", "PCR retransmission time in milliseconds",
1994 offsetof(MpegTSWrite, pcr_period_ms), AV_OPT_TYPE_INT,
1995 { .i64 = -1 }, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1996 { "pat_period", "PAT/PMT retransmission time limit in seconds",
1997 offsetof(MpegTSWrite, pat_period_us), AV_OPT_TYPE_DURATION,
1998 { .i64 = PAT_RETRANS_TIME * 1000LL }, 0, INT64_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1999 { "sdt_period", "SDT retransmission time limit in seconds",
2000 offsetof(MpegTSWrite, sdt_period_us), AV_OPT_TYPE_DURATION,
2001 { .i64 = SDT_RETRANS_TIME * 1000LL }, 0, INT64_MAX, AV_OPT_FLAG_ENCODING_PARAM },
2005 static const AVClass mpegts_muxer_class = {
2006 .class_name = "MPEGTS muxer",
2007 .item_name = av_default_item_name,
2009 .version = LIBAVUTIL_VERSION_INT,
2012 AVOutputFormat ff_mpegts_muxer = {
2014 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2015 .mime_type = "video/MP2T",
2016 .extensions = "ts,m2t,m2ts,mts",
2017 .priv_data_size = sizeof(MpegTSWrite),
2018 .audio_codec = AV_CODEC_ID_MP2,
2019 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
2020 .init = mpegts_init,
2021 .write_packet = mpegts_write_packet,
2022 .write_trailer = mpegts_write_end,
2023 .deinit = mpegts_deinit,
2024 .check_bitstream = mpegts_check_bitstream,
2025 .flags = AVFMT_ALLOW_FLUSH | AVFMT_VARIABLE_FPS | AVFMT_NODIMENSIONS,
2026 .priv_class = &mpegts_muxer_class,