2 * MPEG2 transport stream (aka DVB) muxer
3 * Copyright (c) 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/bswap.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/dict.h"
25 #include "libavutil/mathematics.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/avassert.h"
28 #include "libavcodec/mpegvideo.h"
33 #define PCR_TIME_BASE 27000000
35 /* write DVB SI sections */
37 /*********************************************/
38 /* mpegts section writer */
40 typedef struct MpegTSSection {
43 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
47 typedef struct MpegTSService {
48 MpegTSSection pmt; /* MPEG2 pmt table context */
49 int sid; /* service ID */
54 int pcr_packet_period;
57 typedef struct MpegTSWrite {
58 const AVClass *av_class;
59 MpegTSSection pat; /* MPEG2 pat table */
60 MpegTSSection sdt; /* MPEG2 sdt table context */
61 MpegTSService **services;
63 int sdt_packet_period;
65 int pat_packet_period;
70 int mux_rate; ///< set to 1 when VBR
73 int transport_stream_id;
74 int original_network_id;
81 int reemit_pat_pmt; // backward compatibility
83 #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
84 #define MPEGTS_FLAG_AAC_LATM 0x02
89 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
90 #define DEFAULT_PES_HEADER_FREQ 16
91 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
93 static const AVOption options[] = {
94 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
95 offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
96 { "mpegts_original_network_id", "Set original_network_id field.",
97 offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
98 { "mpegts_service_id", "Set service_id field.",
99 offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
100 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
101 offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
102 { "mpegts_start_pid", "Set the first pid.",
103 offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
104 {"mpegts_m2ts_mode", "Enable m2ts mode.",
105 offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.i64 = -1 },
106 -1,1, AV_OPT_FLAG_ENCODING_PARAM},
107 { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
108 { "pes_payload_size", "Minimum PES packet payload in bytes",
109 offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
110 { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX,
111 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
112 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
113 0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,
114 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
115 { "latm", "Use LATM packetization for AAC",
116 0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,
117 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
118 // backward compatibility
119 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
120 offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
121 { "mpegts_copyts", "dont offset dts/pts",
122 offsetof(MpegTSWrite, copyts), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
126 static const AVClass mpegts_muxer_class = {
127 .class_name = "MPEGTS muxer",
128 .item_name = av_default_item_name,
130 .version = LIBAVUTIL_VERSION_INT,
133 /* NOTE: 4 bytes must be left at the end for the crc32 */
134 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
137 unsigned char packet[TS_PACKET_SIZE];
138 const unsigned char *buf_ptr;
140 int first, b, len1, left;
142 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
143 buf[len - 4] = (crc >> 24) & 0xff;
144 buf[len - 3] = (crc >> 16) & 0xff;
145 buf[len - 2] = (crc >> 8) & 0xff;
146 buf[len - 1] = (crc) & 0xff;
148 /* send each packet */
151 first = (buf == buf_ptr);
159 s->cc = (s->cc + 1) & 0xf;
162 *q++ = 0; /* 0 offset */
163 len1 = TS_PACKET_SIZE - (q - packet);
166 memcpy(q, buf_ptr, len1);
168 /* add known padding data */
169 left = TS_PACKET_SIZE - (q - packet);
171 memset(q, 0xff, left);
173 s->write_packet(s, packet);
180 static inline void put16(uint8_t **q_ptr, int val)
189 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
190 int version, int sec_num, int last_sec_num,
191 uint8_t *buf, int len)
193 uint8_t section[1024], *q;
194 unsigned int tot_len;
195 /* reserved_future_use field must be set to 1 for SDT */
196 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
198 tot_len = 3 + 5 + len + 4;
199 /* check if not too big */
201 return AVERROR_INVALIDDATA;
205 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
207 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
212 mpegts_write_section(s, section, tot_len);
216 /*********************************************/
219 #define DEFAULT_PROVIDER_NAME "FFmpeg"
220 #define DEFAULT_SERVICE_NAME "Service01"
222 /* we retransmit the SI info at this rate */
223 #define SDT_RETRANS_TIME 500
224 #define PAT_RETRANS_TIME 100
225 #define PCR_RETRANS_TIME 20
227 typedef struct MpegTSWriteStream {
228 struct MpegTSService *service;
229 int pid; /* stream associated pid */
232 int first_pts_check; ///< first pts check needed
233 int prev_payload_key;
238 AVFormatContext *amux;
241 static void mpegts_write_pat(AVFormatContext *s)
243 MpegTSWrite *ts = s->priv_data;
244 MpegTSService *service;
245 uint8_t data[1012], *q;
249 for(i = 0; i < ts->nb_services; i++) {
250 service = ts->services[i];
251 put16(&q, service->sid);
252 put16(&q, 0xe000 | service->pmt.pid);
254 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
258 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
260 MpegTSWrite *ts = s->priv_data;
261 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
262 int val, stream_type, i;
265 put16(&q, 0xe000 | service->pcr_pid);
267 program_info_length_ptr = q;
268 q += 2; /* patched after */
270 /* put program info here */
272 val = 0xf000 | (q - program_info_length_ptr - 2);
273 program_info_length_ptr[0] = val >> 8;
274 program_info_length_ptr[1] = val;
276 for(i = 0; i < s->nb_streams; i++) {
277 AVStream *st = s->streams[i];
278 MpegTSWriteStream *ts_st = st->priv_data;
279 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
280 switch(st->codec->codec_id) {
281 case AV_CODEC_ID_MPEG1VIDEO:
282 case AV_CODEC_ID_MPEG2VIDEO:
283 stream_type = STREAM_TYPE_VIDEO_MPEG2;
285 case AV_CODEC_ID_MPEG4:
286 stream_type = STREAM_TYPE_VIDEO_MPEG4;
288 case AV_CODEC_ID_H264:
289 stream_type = STREAM_TYPE_VIDEO_H264;
291 case AV_CODEC_ID_DIRAC:
292 stream_type = STREAM_TYPE_VIDEO_DIRAC;
294 case AV_CODEC_ID_MP2:
295 case AV_CODEC_ID_MP3:
296 stream_type = STREAM_TYPE_AUDIO_MPEG1;
298 case AV_CODEC_ID_AAC:
299 stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM) ? STREAM_TYPE_AUDIO_AAC_LATM : STREAM_TYPE_AUDIO_AAC;
301 case AV_CODEC_ID_AAC_LATM:
302 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
304 case AV_CODEC_ID_AC3:
305 stream_type = STREAM_TYPE_AUDIO_AC3;
308 stream_type = STREAM_TYPE_PRIVATE_DATA;
312 put16(&q, 0xe000 | ts_st->pid);
314 q += 2; /* patched after */
316 /* write optional descriptors here */
317 switch(st->codec->codec_type) {
318 case AVMEDIA_TYPE_AUDIO:
319 if(st->codec->codec_id==AV_CODEC_ID_EAC3){
320 *q++=0x7a; // EAC3 descriptor see A038 DVB SI
321 *q++=1; // 1 byte, all flags sets to 0
322 *q++=0; // omit all fields...
324 if(st->codec->codec_id==AV_CODEC_ID_S302M){
325 *q++ = 0x05; /* MPEG-2 registration descriptor*/
335 char *next = lang->value;
338 *q++ = 0x0a; /* ISO 639 language descriptor */
342 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
343 next = strchr(p, ',');
344 if (strlen(p) != 3 && (!next || next != p + 3))
345 continue; /* not a 3-letter code */
351 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
353 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
355 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
358 *q++ = 0; /* undefined type */
364 q -= 2; /* no language codes were written */
367 case AVMEDIA_TYPE_SUBTITLE:
369 const char *language;
370 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
376 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
377 if(st->codec->extradata_size == 4) {
378 memcpy(q, st->codec->extradata, 4);
381 put16(&q, 1); /* page id */
382 put16(&q, 1); /* ancillary page id */
386 case AVMEDIA_TYPE_VIDEO:
387 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
388 *q++ = 0x05; /*MPEG-2 registration descriptor*/
398 val = 0xf000 | (q - desc_length_ptr - 2);
399 desc_length_ptr[0] = val >> 8;
400 desc_length_ptr[1] = val;
402 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
406 /* NOTE: str == NULL is accepted for an empty string */
407 static void putstr8(uint8_t **q_ptr, const char *str)
423 static void mpegts_write_sdt(AVFormatContext *s)
425 MpegTSWrite *ts = s->priv_data;
426 MpegTSService *service;
427 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
428 int i, running_status, free_ca_mode, val;
433 for(i = 0; i < ts->nb_services; i++) {
434 service = ts->services[i];
435 put16(&q, service->sid);
436 *q++ = 0xfc | 0x00; /* currently no EIT info */
437 desc_list_len_ptr = q;
439 running_status = 4; /* running */
442 /* write only one descriptor for the service name and provider */
446 *q++ = 0x01; /* digital television service */
447 putstr8(&q, service->provider_name);
448 putstr8(&q, service->name);
449 desc_len_ptr[0] = q - desc_len_ptr - 1;
451 /* fill descriptor length */
452 val = (running_status << 13) | (free_ca_mode << 12) |
453 (q - desc_list_len_ptr - 2);
454 desc_list_len_ptr[0] = val >> 8;
455 desc_list_len_ptr[1] = val;
457 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
461 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
463 const char *provider_name,
466 MpegTSService *service;
468 service = av_mallocz(sizeof(MpegTSService));
471 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
473 service->provider_name = av_strdup(provider_name);
474 service->name = av_strdup(name);
475 service->pcr_pid = 0x1fff;
476 dynarray_add(&ts->services, &ts->nb_services, service);
480 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
482 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
486 static void mpegts_prefix_m2ts_header(AVFormatContext *s)
488 MpegTSWrite *ts = s->priv_data;
490 int64_t pcr = get_pcr(s->priv_data, s->pb);
491 uint32_t tp_extra_header = pcr % 0x3fffffff;
492 tp_extra_header = AV_RB32(&tp_extra_header);
493 avio_write(s->pb, (unsigned char *) &tp_extra_header,
494 sizeof(tp_extra_header));
498 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
500 AVFormatContext *ctx = s->opaque;
501 mpegts_prefix_m2ts_header(ctx);
502 avio_write(ctx->pb, packet, TS_PACKET_SIZE);
505 static int mpegts_write_header(AVFormatContext *s)
507 MpegTSWrite *ts = s->priv_data;
508 MpegTSWriteStream *ts_st;
509 MpegTSService *service;
510 AVStream *st, *pcr_st = NULL;
511 AVDictionaryEntry *title, *provider;
513 const char *service_name;
514 const char *provider_name;
518 if (s->max_delay < 0) /* Not set by the caller */
521 // round up to a whole number of TS packets
522 ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
524 ts->tsid = ts->transport_stream_id;
525 ts->onid = ts->original_network_id;
526 /* allocate a single DVB service */
527 title = av_dict_get(s->metadata, "service_name", NULL, 0);
529 title = av_dict_get(s->metadata, "title", NULL, 0);
530 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
531 provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
532 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
533 service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
534 service->pmt.write_packet = section_write_packet;
535 service->pmt.opaque = s;
536 service->pmt.cc = 15;
538 ts->pat.pid = PAT_PID;
539 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
540 ts->pat.write_packet = section_write_packet;
543 ts->sdt.pid = SDT_PID;
545 ts->sdt.write_packet = section_write_packet;
548 pids = av_malloc(s->nb_streams * sizeof(*pids));
550 return AVERROR(ENOMEM);
552 /* assign pids to each stream */
553 for(i = 0;i < s->nb_streams; i++) {
555 avpriv_set_pts_info(st, 33, 1, 90000);
556 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
558 ret = AVERROR(ENOMEM);
561 st->priv_data = ts_st;
562 ts_st->payload = av_mallocz(ts->pes_payload_size);
563 if (!ts_st->payload) {
564 ret = AVERROR(ENOMEM);
567 ts_st->service = service;
568 /* MPEG pid values < 16 are reserved. Applications which set st->id in
569 * this range are assigned a calculated pid. */
571 ts_st->pid = ts->start_pid + i;
572 } else if (st->id < 0x1FFF) {
575 av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
576 ret = AVERROR(EINVAL);
579 if (ts_st->pid == service->pmt.pid) {
580 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
581 ret = AVERROR(EINVAL);
584 for (j = 0; j < i; j++)
585 if (pids[j] == ts_st->pid) {
586 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
587 ret = AVERROR(EINVAL);
590 pids[i] = ts_st->pid;
591 ts_st->payload_pts = AV_NOPTS_VALUE;
592 ts_st->payload_dts = AV_NOPTS_VALUE;
593 ts_st->first_pts_check = 1;
595 /* update PCR pid by using the first video stream */
596 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
597 service->pcr_pid == 0x1fff) {
598 service->pcr_pid = ts_st->pid;
601 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
602 st->codec->extradata_size > 0)
605 ts_st->amux = avformat_alloc_context();
607 ret = AVERROR(ENOMEM);
610 ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL);
611 if (!ts_st->amux->oformat) {
612 ret = AVERROR(EINVAL);
615 ast = avformat_new_stream(ts_st->amux, NULL);
616 ret = avcodec_copy_context(ast->codec, st->codec);
619 ret = avformat_write_header(ts_st->amux, NULL);
627 /* if no video stream, use the first stream as PCR */
628 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
629 pcr_st = s->streams[0];
630 ts_st = pcr_st->priv_data;
631 service->pcr_pid = ts_st->pid;
634 if (ts->mux_rate > 1) {
635 service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
636 (TS_PACKET_SIZE * 8 * 1000);
637 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
638 (TS_PACKET_SIZE * 8 * 1000);
639 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
640 (TS_PACKET_SIZE * 8 * 1000);
643 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
645 /* Arbitrary values, PAT/PMT will also be written on video key frames */
646 ts->sdt_packet_period = 200;
647 ts->pat_packet_period = 40;
648 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
649 if (!pcr_st->codec->frame_size) {
650 av_log(s, AV_LOG_WARNING, "frame size not set\n");
651 service->pcr_packet_period =
652 pcr_st->codec->sample_rate/(10*512);
654 service->pcr_packet_period =
655 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
658 // max delta PCR 0.1s
659 service->pcr_packet_period =
660 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
662 if(!service->pcr_packet_period)
663 service->pcr_packet_period = 1;
666 // output a PCR as soon as possible
667 service->pcr_packet_count = service->pcr_packet_period;
668 ts->pat_packet_count = ts->pat_packet_period-1;
669 ts->sdt_packet_count = ts->sdt_packet_period-1;
671 if (ts->mux_rate == 1)
672 av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
674 av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
675 av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, "
676 "sdt every %d, pat/pmt every %d pkts\n",
677 service->pcr_packet_period,
678 ts->sdt_packet_period, ts->pat_packet_period);
680 if (ts->m2ts_mode == -1) {
681 if (av_match_ext(s->filename, "m2ts")) {
694 for(i = 0;i < s->nb_streams; i++) {
695 MpegTSWriteStream *ts_st;
697 ts_st = st->priv_data;
699 av_freep(&ts_st->payload);
701 avformat_free_context(ts_st->amux);
705 av_freep(&st->priv_data);
710 /* send SDT, PAT and PMT tables regulary */
711 static void retransmit_si_info(AVFormatContext *s, int force_pat)
713 MpegTSWrite *ts = s->priv_data;
716 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
717 ts->sdt_packet_count = 0;
720 if (++ts->pat_packet_count == ts->pat_packet_period || force_pat) {
721 ts->pat_packet_count = 0;
723 for(i = 0; i < ts->nb_services; i++) {
724 mpegts_write_pmt(s, ts->services[i]);
729 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
731 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
733 *buf++ = pcr_high >> 25;
734 *buf++ = pcr_high >> 17;
735 *buf++ = pcr_high >> 9;
736 *buf++ = pcr_high >> 1;
737 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
743 /* Write a single null transport stream packet */
744 static void mpegts_insert_null_packet(AVFormatContext *s)
747 uint8_t buf[TS_PACKET_SIZE];
754 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
755 mpegts_prefix_m2ts_header(s);
756 avio_write(s->pb, buf, TS_PACKET_SIZE);
759 /* Write a single transport stream packet with a PCR and no payload */
760 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
762 MpegTSWrite *ts = s->priv_data;
763 MpegTSWriteStream *ts_st = st->priv_data;
765 uint8_t buf[TS_PACKET_SIZE];
769 *q++ = ts_st->pid >> 8;
771 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
772 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
773 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
774 *q++ = 0x10; /* Adaptation flags: PCR present */
776 /* PCR coded into 6 bytes */
777 q += write_pcr_bits(q, get_pcr(ts, s->pb));
780 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
781 mpegts_prefix_m2ts_header(s);
782 avio_write(s->pb, buf, TS_PACKET_SIZE);
785 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
789 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
791 val = (((pts >> 15) & 0x7fff) << 1) | 1;
794 val = (((pts) & 0x7fff) << 1) | 1;
799 /* Set an adaptation field flag in an MPEG-TS packet*/
800 static void set_af_flag(uint8_t *pkt, int flag)
802 // expect at least one flag to set
805 if ((pkt[3] & 0x20) == 0) {
806 // no AF yet, set adaptation field flag
808 // 1 byte length, no flags
815 /* Extend the adaptation field by size bytes */
816 static void extend_af(uint8_t *pkt, int size)
818 // expect already existing adaptation field
819 av_assert0(pkt[3] & 0x20);
823 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
824 static uint8_t *get_ts_payload_start(uint8_t *pkt)
827 return pkt + 5 + pkt[4];
832 /* Add a pes header to the front of payload, and segment into an integer number of
833 * ts packets. The final ts packet is padded using an over-sized adaptation header
834 * to exactly fill the last ts packet.
835 * NOTE: 'payload' contains a complete PES payload.
837 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
838 const uint8_t *payload, int payload_size,
839 int64_t pts, int64_t dts, int key)
841 MpegTSWriteStream *ts_st = st->priv_data;
842 MpegTSWrite *ts = s->priv_data;
843 uint8_t buf[TS_PACKET_SIZE];
845 int val, is_start, len, header_len, write_pcr, private_code, flags;
846 int afc_len, stuffing_len;
847 int64_t pcr = -1; /* avoid warning */
848 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
849 int force_pat = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key;
852 while (payload_size > 0) {
853 retransmit_si_info(s, force_pat);
857 if (ts_st->pid == ts_st->service->pcr_pid) {
858 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
859 ts_st->service->pcr_packet_count++;
860 if (ts_st->service->pcr_packet_count >=
861 ts_st->service->pcr_packet_period) {
862 ts_st->service->pcr_packet_count = 0;
867 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
868 (dts - get_pcr(ts, s->pb)/300) > delay) {
869 /* pcr insert gets priority over null packet insert */
871 mpegts_insert_pcr_only(s, st);
873 mpegts_insert_null_packet(s);
874 continue; /* recalculate write_pcr and possibly retransmit si_info */
877 /* prepare packet header */
880 val = (ts_st->pid >> 8);
885 ts_st->cc = (ts_st->cc + 1) & 0xf;
886 *q++ = 0x10 | ts_st->cc; // payload indicator + CC
887 if (key && is_start && pts != AV_NOPTS_VALUE) {
888 // set Random Access for key frames
889 if (ts_st->pid == ts_st->service->pcr_pid)
891 set_af_flag(buf, 0x40);
892 q = get_ts_payload_start(buf);
895 set_af_flag(buf, 0x10);
896 q = get_ts_payload_start(buf);
897 // add 11, pcr references the last byte of program clock reference base
898 if (ts->mux_rate > 1)
899 pcr = get_pcr(ts, s->pb);
901 pcr = (dts - delay)*300;
902 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
903 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
904 extend_af(buf, write_pcr_bits(q, pcr));
905 q = get_ts_payload_start(buf);
908 int pes_extension = 0;
909 /* write PES header */
914 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
915 if (st->codec->codec_id == AV_CODEC_ID_DIRAC) {
919 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
920 (st->codec->codec_id == AV_CODEC_ID_MP2 ||
921 st->codec->codec_id == AV_CODEC_ID_MP3 ||
922 st->codec->codec_id == AV_CODEC_ID_AAC)) {
924 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
925 st->codec->codec_id == AV_CODEC_ID_AC3 &&
930 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
936 if (pts != AV_NOPTS_VALUE) {
940 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
944 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
945 st->codec->codec_id == AV_CODEC_ID_DIRAC) {
946 /* set PES_extension_flag */
951 * One byte for PES2 extension flag +
952 * one byte for extension length +
953 * one byte for extension id
957 /* for Blu-ray AC3 Audio the PES Extension flag should be as follow
958 * otherwise it will not play sound on blu-ray
961 st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
962 st->codec->codec_id == AV_CODEC_ID_AC3) {
963 /* set PES_extension_flag */
968 len = payload_size + header_len + 3;
969 if (private_code != 0)
976 /* data alignment indicator is required for subtitle data */
977 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
982 if (pts != AV_NOPTS_VALUE) {
983 write_pts(q, flags >> 6, pts);
986 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
987 write_pts(q, 1, dts);
990 if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {
991 flags = 0x01; /* set PES_extension_flag_2 */
993 *q++ = 0x80 | 0x01; /* marker bit + extension length */
995 * Set the stream id extension flag bit to 0 and
996 * write the extended stream id
1000 /* For Blu-ray AC3 Audio Setting extended flags */
1001 if (ts->m2ts_mode &&
1003 st->codec->codec_id == AV_CODEC_ID_AC3) {
1004 flags = 0x01; /* set PES_extension_flag_2 */
1006 *q++ = 0x80 | 0x01; /* marker bit + extension length */
1007 *q++ = 0x00 | 0x71; /* for AC3 Audio (specifically on blue-rays) */
1011 if (private_code != 0)
1012 *q++ = private_code;
1016 header_len = q - buf;
1018 len = TS_PACKET_SIZE - header_len;
1019 if (len > payload_size)
1021 stuffing_len = TS_PACKET_SIZE - header_len - len;
1022 if (stuffing_len > 0) {
1023 /* add stuffing with AFC */
1024 if (buf[3] & 0x20) {
1025 /* stuffing already present: increase its size */
1026 afc_len = buf[4] + 1;
1027 memmove(buf + 4 + afc_len + stuffing_len,
1029 header_len - (4 + afc_len));
1030 buf[4] += stuffing_len;
1031 memset(buf + 4 + afc_len, 0xff, stuffing_len);
1034 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
1036 buf[4] = stuffing_len - 1;
1037 if (stuffing_len >= 2) {
1039 memset(buf + 6, 0xff, stuffing_len - 2);
1043 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
1045 payload_size -= len;
1046 mpegts_prefix_m2ts_header(s);
1047 avio_write(s->pb, buf, TS_PACKET_SIZE);
1050 ts_st->prev_payload_key = key;
1053 static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1055 AVStream *st = s->streams[pkt->stream_index];
1056 int size = pkt->size;
1057 uint8_t *buf= pkt->data;
1058 uint8_t *data= NULL;
1059 MpegTSWrite *ts = s->priv_data;
1060 MpegTSWriteStream *ts_st = st->priv_data;
1061 const int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
1062 int64_t dts = pkt->dts, pts = pkt->pts;
1064 if (ts->reemit_pat_pmt) {
1065 av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
1066 ts->reemit_pat_pmt = 0;
1067 ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;
1070 if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
1071 ts->pat_packet_count = ts->pat_packet_period - 1;
1072 ts->sdt_packet_count = ts->sdt_packet_period - 1;
1073 ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
1077 if (pts != AV_NOPTS_VALUE)
1079 if (dts != AV_NOPTS_VALUE)
1083 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
1084 av_log(s, AV_LOG_ERROR, "first pts value must set\n");
1085 return AVERROR_INVALIDDATA;
1087 ts_st->first_pts_check = 0;
1089 if (st->codec->codec_id == AV_CODEC_ID_H264) {
1090 const uint8_t *p = buf, *buf_end = p+size;
1091 uint32_t state = -1;
1093 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
1094 av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
1095 "no startcode found, use the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)\n");
1096 return AVERROR(EINVAL);
1100 p = avpriv_mpv_find_start_code(p, buf_end, &state);
1101 av_dlog(s, "nal %d\n", state & 0x1f);
1102 } while (p < buf_end && (state & 0x1f) != 9 &&
1103 (state & 0x1f) != 5 && (state & 0x1f) != 1);
1105 if ((state & 0x1f) != 9) { // AUD NAL
1106 data = av_malloc(pkt->size+6);
1108 return AVERROR(ENOMEM);
1109 memcpy(data+6, pkt->data, pkt->size);
1110 AV_WB32(data, 0x00000001);
1112 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1116 } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {
1117 if (pkt->size < 2) {
1118 av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
1119 return AVERROR_INVALIDDATA;
1121 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
1126 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
1127 "and extradata missing\n");
1128 return AVERROR_INVALIDDATA;
1131 av_init_packet(&pkt2);
1132 pkt2.data = pkt->data;
1133 pkt2.size = pkt->size;
1134 ret = avio_open_dyn_buf(&ts_st->amux->pb);
1136 return AVERROR(ENOMEM);
1138 ret = av_write_frame(ts_st->amux, &pkt2);
1140 avio_close_dyn_buf(ts_st->amux->pb, &data);
1141 ts_st->amux->pb = NULL;
1145 size = avio_close_dyn_buf(ts_st->amux->pb, &data);
1146 ts_st->amux->pb = NULL;
1151 if (pkt->dts != AV_NOPTS_VALUE) {
1153 for(i=0; i<s->nb_streams; i++){
1154 AVStream *st2 = s->streams[i];
1155 MpegTSWriteStream *ts_st2 = st2->priv_data;
1156 if( ts_st2->payload_size
1157 && (ts_st2->payload_dts == AV_NOPTS_VALUE || dts - ts_st2->payload_dts > delay/2)){
1158 mpegts_write_pes(s, st2, ts_st2->payload, ts_st2->payload_size,
1159 ts_st2->payload_pts, ts_st2->payload_dts,
1160 ts_st2->payload_flags & AV_PKT_FLAG_KEY);
1161 ts_st2->payload_size = 0;
1166 if (ts_st->payload_size && ts_st->payload_size + size > ts->pes_payload_size) {
1167 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1168 ts_st->payload_pts, ts_st->payload_dts,
1169 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1170 ts_st->payload_size = 0;
1173 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO || size > ts->pes_payload_size) {
1174 av_assert0(!ts_st->payload_size);
1175 // for video and subtitle, write a single pes packet
1176 mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);
1181 if (!ts_st->payload_size) {
1182 ts_st->payload_pts = pts;
1183 ts_st->payload_dts = dts;
1184 ts_st->payload_flags = pkt->flags;
1187 memcpy(ts_st->payload + ts_st->payload_size, buf, size);
1188 ts_st->payload_size += size;
1195 static void mpegts_write_flush(AVFormatContext *s)
1199 /* flush current packets */
1200 for(i = 0; i < s->nb_streams; i++) {
1201 AVStream *st = s->streams[i];
1202 MpegTSWriteStream *ts_st = st->priv_data;
1203 if (ts_st->payload_size > 0) {
1204 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1205 ts_st->payload_pts, ts_st->payload_dts,
1206 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1207 ts_st->payload_size = 0;
1213 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
1216 mpegts_write_flush(s);
1219 return mpegts_write_packet_internal(s, pkt);
1223 static int mpegts_write_end(AVFormatContext *s)
1225 MpegTSWrite *ts = s->priv_data;
1226 MpegTSService *service;
1229 mpegts_write_flush(s);
1231 for(i = 0; i < s->nb_streams; i++) {
1232 AVStream *st = s->streams[i];
1233 MpegTSWriteStream *ts_st = st->priv_data;
1234 av_freep(&ts_st->payload);
1236 avformat_free_context(ts_st->amux);
1241 for(i = 0; i < ts->nb_services; i++) {
1242 service = ts->services[i];
1243 av_freep(&service->provider_name);
1244 av_freep(&service->name);
1247 av_free(ts->services);
1252 AVOutputFormat ff_mpegts_muxer = {
1254 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
1255 .mime_type = "video/x-mpegts",
1256 .extensions = "ts,m2t,m2ts,mts",
1257 .priv_data_size = sizeof(MpegTSWrite),
1258 .audio_codec = AV_CODEC_ID_MP2,
1259 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1260 .write_header = mpegts_write_header,
1261 .write_packet = mpegts_write_packet,
1262 .write_trailer = mpegts_write_end,
1263 .flags = AVFMT_ALLOW_FLUSH,
1264 .priv_class = &mpegts_muxer_class,