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/intreadwrite.h"
26 #include "libavutil/mathematics.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/avassert.h"
29 #include "libavcodec/internal.h"
34 #define PCR_TIME_BASE 27000000
36 /* write DVB SI sections */
38 /*********************************************/
39 /* mpegts section writer */
41 typedef struct MpegTSSection {
44 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
48 typedef struct MpegTSService {
49 MpegTSSection pmt; /* MPEG2 pmt table context */
50 int sid; /* service ID */
55 int pcr_packet_period;
58 typedef struct MpegTSWrite {
59 const AVClass *av_class;
60 MpegTSSection pat; /* MPEG2 pat table */
61 MpegTSSection sdt; /* MPEG2 sdt table context */
62 MpegTSService **services;
64 int sdt_packet_period;
66 int pat_packet_period;
71 int mux_rate; ///< set to 1 when VBR
74 int transport_stream_id;
75 int original_network_id;
82 int reemit_pat_pmt; // backward compatibility
85 #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
86 #define MPEGTS_FLAG_AAC_LATM 0x02
91 int omit_video_pes_length;
94 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
95 #define DEFAULT_PES_HEADER_FREQ 16
96 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
98 /* NOTE: 4 bytes must be left at the end for the crc32 */
99 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
102 unsigned char packet[TS_PACKET_SIZE];
103 const unsigned char *buf_ptr;
105 int first, b, len1, left;
107 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
108 buf[len - 4] = (crc >> 24) & 0xff;
109 buf[len - 3] = (crc >> 16) & 0xff;
110 buf[len - 2] = (crc >> 8) & 0xff;
111 buf[len - 1] = (crc) & 0xff;
113 /* send each packet */
116 first = (buf == buf_ptr);
124 s->cc = (s->cc + 1) & 0xf;
127 *q++ = 0; /* 0 offset */
128 len1 = TS_PACKET_SIZE - (q - packet);
131 memcpy(q, buf_ptr, len1);
133 /* add known padding data */
134 left = TS_PACKET_SIZE - (q - packet);
136 memset(q, 0xff, left);
138 s->write_packet(s, packet);
145 static inline void put16(uint8_t **q_ptr, int val)
154 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
155 int version, int sec_num, int last_sec_num,
156 uint8_t *buf, int len)
158 uint8_t section[1024], *q;
159 unsigned int tot_len;
160 /* reserved_future_use field must be set to 1 for SDT */
161 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
163 tot_len = 3 + 5 + len + 4;
164 /* check if not too big */
166 return AVERROR_INVALIDDATA;
170 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
172 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
177 mpegts_write_section(s, section, tot_len);
181 /*********************************************/
184 #define DEFAULT_PROVIDER_NAME "FFmpeg"
185 #define DEFAULT_SERVICE_NAME "Service01"
187 /* we retransmit the SI info at this rate */
188 #define SDT_RETRANS_TIME 500
189 #define PAT_RETRANS_TIME 100
190 #define PCR_RETRANS_TIME 20
192 typedef struct MpegTSWriteStream {
193 struct MpegTSService *service;
194 int pid; /* stream associated pid */
197 int first_pts_check; ///< first pts check needed
198 int prev_payload_key;
203 AVFormatContext *amux;
207 static void mpegts_write_pat(AVFormatContext *s)
209 MpegTSWrite *ts = s->priv_data;
210 MpegTSService *service;
211 uint8_t data[1012], *q;
215 for(i = 0; i < ts->nb_services; i++) {
216 service = ts->services[i];
217 put16(&q, service->sid);
218 put16(&q, 0xe000 | service->pmt.pid);
220 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, ts->tables_version, 0, 0,
224 static int mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
226 MpegTSWrite *ts = s->priv_data;
227 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
228 int val, stream_type, i;
231 put16(&q, 0xe000 | service->pcr_pid);
233 program_info_length_ptr = q;
234 q += 2; /* patched after */
236 /* put program info here */
238 val = 0xf000 | (q - program_info_length_ptr - 2);
239 program_info_length_ptr[0] = val >> 8;
240 program_info_length_ptr[1] = val;
242 for(i = 0; i < s->nb_streams; i++) {
243 AVStream *st = s->streams[i];
244 MpegTSWriteStream *ts_st = st->priv_data;
245 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
246 switch(st->codec->codec_id) {
247 case AV_CODEC_ID_MPEG1VIDEO:
248 case AV_CODEC_ID_MPEG2VIDEO:
249 stream_type = STREAM_TYPE_VIDEO_MPEG2;
251 case AV_CODEC_ID_MPEG4:
252 stream_type = STREAM_TYPE_VIDEO_MPEG4;
254 case AV_CODEC_ID_H264:
255 stream_type = STREAM_TYPE_VIDEO_H264;
257 case AV_CODEC_ID_HEVC:
258 stream_type = STREAM_TYPE_VIDEO_HEVC;
260 case AV_CODEC_ID_CAVS:
261 stream_type = STREAM_TYPE_VIDEO_CAVS;
263 case AV_CODEC_ID_DIRAC:
264 stream_type = STREAM_TYPE_VIDEO_DIRAC;
266 case AV_CODEC_ID_MP2:
267 case AV_CODEC_ID_MP3:
268 stream_type = STREAM_TYPE_AUDIO_MPEG1;
270 case AV_CODEC_ID_AAC:
271 stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM) ? STREAM_TYPE_AUDIO_AAC_LATM : STREAM_TYPE_AUDIO_AAC;
273 case AV_CODEC_ID_AAC_LATM:
274 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
276 case AV_CODEC_ID_AC3:
277 stream_type = STREAM_TYPE_AUDIO_AC3;
279 case AV_CODEC_ID_DTS:
280 stream_type = STREAM_TYPE_AUDIO_DTS;
282 case AV_CODEC_ID_TRUEHD:
283 stream_type = STREAM_TYPE_AUDIO_TRUEHD;
286 stream_type = STREAM_TYPE_PRIVATE_DATA;
290 if (q - data > sizeof(data) - 32)
291 return AVERROR(EINVAL);
294 put16(&q, 0xe000 | ts_st->pid);
296 q += 2; /* patched after */
298 /* write optional descriptors here */
299 switch(st->codec->codec_type) {
300 case AVMEDIA_TYPE_AUDIO:
301 if(st->codec->codec_id==AV_CODEC_ID_EAC3){
302 *q++=0x7a; // EAC3 descriptor see A038 DVB SI
303 *q++=1; // 1 byte, all flags sets to 0
304 *q++=0; // omit all fields...
306 if(st->codec->codec_id==AV_CODEC_ID_S302M){
307 *q++ = 0x05; /* MPEG-2 registration descriptor*/
317 char *next = lang->value;
320 *q++ = 0x0a; /* ISO 639 language descriptor */
324 for (p = lang->value; next && *len_ptr < 255 / 4 * 4 && q - data < sizeof(data) - 4; p = next + 1) {
325 next = strchr(p, ',');
326 if (strlen(p) != 3 && (!next || next != p + 3))
327 continue; /* not a 3-letter code */
333 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
335 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
337 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
340 *q++ = 0; /* undefined type */
346 q -= 2; /* no language codes were written */
349 case AVMEDIA_TYPE_SUBTITLE:
351 const char default_language[] = "und";
352 const char *language = lang && strlen(lang->value) >= 3 ? lang->value : default_language;
354 if (st->codec->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
356 int extradata_copied = 0;
358 *q++ = 0x59; /* subtitling_descriptor */
361 while (strlen(language) >= 3 && (sizeof(data) - (q - data)) >= 8) { /* 8 bytes per DVB subtitle substream data */
366 if (*language != '\0')
369 if (st->codec->extradata_size - extradata_copied >= 5) {
370 *q++ = st->codec->extradata[extradata_copied + 4]; /* subtitling_type */
371 memcpy(q, st->codec->extradata + extradata_copied, 4); /* composition_page_id and ancillary_page_id */
372 extradata_copied += 5;
376 * 0x10 - normal with no monitor aspect ratio criticality
377 * 0x20 - for the hard of hearing with no monitor aspect ratio criticality */
378 *q++ = (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED) ? 0x20 : 0x10;
379 if ((st->codec->extradata_size == 4) && (extradata_copied == 0)) {
380 /* support of old 4-byte extradata format */
381 memcpy(q, st->codec->extradata, 4); /* composition_page_id and ancillary_page_id */
382 extradata_copied += 4;
385 put16(&q, 1); /* composition_page_id */
386 put16(&q, 1); /* ancillary_page_id */
391 *len_ptr = q - len_ptr - 1;
392 } else if (st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
393 uint8_t *len_ptr = NULL;
394 int extradata_copied = 0;
396 /* The descriptor tag. teletext_descriptor */
400 while (strlen(language) >= 3 && q - data < sizeof(data) - 6) {
405 if (*language != '\0')
408 if (st->codec->extradata_size - 1 > extradata_copied) {
409 memcpy(q, st->codec->extradata + extradata_copied, 2);
410 extradata_copied += 2;
413 /* The Teletext descriptor:
414 * teletext_type: This 5-bit field indicates the type of Teletext page indicated. (0x01 Initial Teletext page)
415 * teletext_magazine_number: This is a 3-bit field which identifies the magazine number.
416 * teletext_page_number: This is an 8-bit field giving two 4-bit hex digits identifying the page number. */
422 *len_ptr = q - len_ptr - 1;
426 case AVMEDIA_TYPE_VIDEO:
427 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
428 *q++ = 0x05; /*MPEG-2 registration descriptor*/
436 case AVMEDIA_TYPE_DATA:
437 if (st->codec->codec_id == AV_CODEC_ID_SMPTE_KLV) {
438 *q++ = 0x05; /* MPEG-2 registration descriptor */
448 val = 0xf000 | (q - desc_length_ptr - 2);
449 desc_length_ptr[0] = val >> 8;
450 desc_length_ptr[1] = val;
452 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, ts->tables_version, 0, 0,
457 /* NOTE: str == NULL is accepted for an empty string */
458 static void putstr8(uint8_t **q_ptr, const char *str)
474 static void mpegts_write_sdt(AVFormatContext *s)
476 MpegTSWrite *ts = s->priv_data;
477 MpegTSService *service;
478 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
479 int i, running_status, free_ca_mode, val;
484 for(i = 0; i < ts->nb_services; i++) {
485 service = ts->services[i];
486 put16(&q, service->sid);
487 *q++ = 0xfc | 0x00; /* currently no EIT info */
488 desc_list_len_ptr = q;
490 running_status = 4; /* running */
493 /* write only one descriptor for the service name and provider */
497 *q++ = 0x01; /* digital television service */
498 putstr8(&q, service->provider_name);
499 putstr8(&q, service->name);
500 desc_len_ptr[0] = q - desc_len_ptr - 1;
502 /* fill descriptor length */
503 val = (running_status << 13) | (free_ca_mode << 12) |
504 (q - desc_list_len_ptr - 2);
505 desc_list_len_ptr[0] = val >> 8;
506 desc_list_len_ptr[1] = val;
508 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, ts->tables_version, 0, 0,
512 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
514 const char *provider_name,
517 MpegTSService *service;
519 service = av_mallocz(sizeof(MpegTSService));
522 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
524 service->provider_name = av_strdup(provider_name);
525 service->name = av_strdup(name);
526 service->pcr_pid = 0x1fff;
527 dynarray_add(&ts->services, &ts->nb_services, service);
531 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
533 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
537 static void mpegts_prefix_m2ts_header(AVFormatContext *s)
539 MpegTSWrite *ts = s->priv_data;
541 int64_t pcr = get_pcr(s->priv_data, s->pb);
542 uint32_t tp_extra_header = pcr % 0x3fffffff;
543 tp_extra_header = AV_RB32(&tp_extra_header);
544 avio_write(s->pb, (unsigned char *) &tp_extra_header,
545 sizeof(tp_extra_header));
549 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
551 AVFormatContext *ctx = s->opaque;
552 mpegts_prefix_m2ts_header(ctx);
553 avio_write(ctx->pb, packet, TS_PACKET_SIZE);
556 static int mpegts_write_header(AVFormatContext *s)
558 MpegTSWrite *ts = s->priv_data;
559 MpegTSWriteStream *ts_st;
560 MpegTSService *service;
561 AVStream *st, *pcr_st = NULL;
562 AVDictionaryEntry *title, *provider;
564 const char *service_name;
565 const char *provider_name;
569 if (s->max_delay < 0) /* Not set by the caller */
572 // round up to a whole number of TS packets
573 ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
575 ts->tsid = ts->transport_stream_id;
576 ts->onid = ts->original_network_id;
577 /* allocate a single DVB service */
578 title = av_dict_get(s->metadata, "service_name", NULL, 0);
580 title = av_dict_get(s->metadata, "title", NULL, 0);
581 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
582 provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
583 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
584 service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
585 service->pmt.write_packet = section_write_packet;
586 service->pmt.opaque = s;
587 service->pmt.cc = 15;
589 ts->pat.pid = PAT_PID;
590 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
591 ts->pat.write_packet = section_write_packet;
594 ts->sdt.pid = SDT_PID;
596 ts->sdt.write_packet = section_write_packet;
599 pids = av_malloc_array(s->nb_streams, sizeof(*pids));
601 return AVERROR(ENOMEM);
603 /* assign pids to each stream */
604 for(i = 0;i < s->nb_streams; i++) {
607 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
609 ret = AVERROR(ENOMEM);
612 st->priv_data = ts_st;
614 ts_st->user_tb = st->time_base;
615 avpriv_set_pts_info(st, 33, 1, 90000);
617 ts_st->payload = av_mallocz(ts->pes_payload_size);
618 if (!ts_st->payload) {
619 ret = AVERROR(ENOMEM);
622 ts_st->service = service;
623 /* MPEG pid values < 16 are reserved. Applications which set st->id in
624 * this range are assigned a calculated pid. */
626 ts_st->pid = ts->start_pid + i;
627 } else if (st->id < 0x1FFF) {
630 av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
631 ret = AVERROR(EINVAL);
634 if (ts_st->pid == service->pmt.pid) {
635 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
636 ret = AVERROR(EINVAL);
639 for (j = 0; j < i; j++)
640 if (pids[j] == ts_st->pid) {
641 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
642 ret = AVERROR(EINVAL);
645 pids[i] = ts_st->pid;
646 ts_st->payload_pts = AV_NOPTS_VALUE;
647 ts_st->payload_dts = AV_NOPTS_VALUE;
648 ts_st->first_pts_check = 1;
650 /* update PCR pid by using the first video stream */
651 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
652 service->pcr_pid == 0x1fff) {
653 service->pcr_pid = ts_st->pid;
656 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
657 st->codec->extradata_size > 0)
660 ts_st->amux = avformat_alloc_context();
662 ret = AVERROR(ENOMEM);
665 ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL);
666 if (!ts_st->amux->oformat) {
667 ret = AVERROR(EINVAL);
670 ast = avformat_new_stream(ts_st->amux, NULL);
672 ret = AVERROR(ENOMEM);
675 ret = avcodec_copy_context(ast->codec, st->codec);
678 ret = avformat_write_header(ts_st->amux, NULL);
686 /* if no video stream, use the first stream as PCR */
687 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
688 pcr_st = s->streams[0];
689 ts_st = pcr_st->priv_data;
690 service->pcr_pid = ts_st->pid;
692 ts_st = pcr_st->priv_data;
694 if (ts->mux_rate > 1) {
695 service->pcr_packet_period = (ts->mux_rate * ts->pcr_period) /
696 (TS_PACKET_SIZE * 8 * 1000);
697 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
698 (TS_PACKET_SIZE * 8 * 1000);
699 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
700 (TS_PACKET_SIZE * 8 * 1000);
703 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
705 /* Arbitrary values, PAT/PMT will also be written on video key frames */
706 ts->sdt_packet_period = 200;
707 ts->pat_packet_period = 40;
708 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
709 if (!pcr_st->codec->frame_size) {
710 av_log(s, AV_LOG_WARNING, "frame size not set\n");
711 service->pcr_packet_period =
712 pcr_st->codec->sample_rate/(10*512);
714 service->pcr_packet_period =
715 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
718 // max delta PCR 0.1s
719 // TODO: should be avg_frame_rate
720 service->pcr_packet_period =
721 ts_st->user_tb.den / (10 * ts_st->user_tb.num);
723 if(!service->pcr_packet_period)
724 service->pcr_packet_period = 1;
727 // output a PCR as soon as possible
728 service->pcr_packet_count = service->pcr_packet_period;
729 ts->pat_packet_count = ts->pat_packet_period-1;
730 ts->sdt_packet_count = ts->sdt_packet_period-1;
732 if (ts->mux_rate == 1)
733 av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
735 av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
736 av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, "
737 "sdt every %d, pat/pmt every %d pkts\n",
738 service->pcr_packet_period,
739 ts->sdt_packet_period, ts->pat_packet_period);
741 if (ts->m2ts_mode == -1) {
742 if (av_match_ext(s->filename, "m2ts")) {
755 for(i = 0;i < s->nb_streams; i++) {
756 MpegTSWriteStream *ts_st;
758 ts_st = st->priv_data;
760 av_freep(&ts_st->payload);
762 avformat_free_context(ts_st->amux);
766 av_freep(&st->priv_data);
771 /* send SDT, PAT and PMT tables regulary */
772 static void retransmit_si_info(AVFormatContext *s, int force_pat)
774 MpegTSWrite *ts = s->priv_data;
777 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
778 ts->sdt_packet_count = 0;
781 if (++ts->pat_packet_count == ts->pat_packet_period || force_pat) {
782 ts->pat_packet_count = 0;
784 for(i = 0; i < ts->nb_services; i++) {
785 mpegts_write_pmt(s, ts->services[i]);
790 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
792 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
794 *buf++ = pcr_high >> 25;
795 *buf++ = pcr_high >> 17;
796 *buf++ = pcr_high >> 9;
797 *buf++ = pcr_high >> 1;
798 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
804 /* Write a single null transport stream packet */
805 static void mpegts_insert_null_packet(AVFormatContext *s)
808 uint8_t buf[TS_PACKET_SIZE];
815 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
816 mpegts_prefix_m2ts_header(s);
817 avio_write(s->pb, buf, TS_PACKET_SIZE);
820 /* Write a single transport stream packet with a PCR and no payload */
821 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
823 MpegTSWrite *ts = s->priv_data;
824 MpegTSWriteStream *ts_st = st->priv_data;
826 uint8_t buf[TS_PACKET_SIZE];
830 *q++ = ts_st->pid >> 8;
832 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
833 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
834 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
835 *q++ = 0x10; /* Adaptation flags: PCR present */
837 /* PCR coded into 6 bytes */
838 q += write_pcr_bits(q, get_pcr(ts, s->pb));
841 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
842 mpegts_prefix_m2ts_header(s);
843 avio_write(s->pb, buf, TS_PACKET_SIZE);
846 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
850 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
852 val = (((pts >> 15) & 0x7fff) << 1) | 1;
855 val = (((pts) & 0x7fff) << 1) | 1;
860 /* Set an adaptation field flag in an MPEG-TS packet*/
861 static void set_af_flag(uint8_t *pkt, int flag)
863 // expect at least one flag to set
866 if ((pkt[3] & 0x20) == 0) {
867 // no AF yet, set adaptation field flag
869 // 1 byte length, no flags
876 /* Extend the adaptation field by size bytes */
877 static void extend_af(uint8_t *pkt, int size)
879 // expect already existing adaptation field
880 av_assert0(pkt[3] & 0x20);
884 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
885 static uint8_t *get_ts_payload_start(uint8_t *pkt)
888 return pkt + 5 + pkt[4];
893 /* Add a pes header to the front of payload, and segment into an integer number of
894 * ts packets. The final ts packet is padded using an over-sized adaptation header
895 * to exactly fill the last ts packet.
896 * NOTE: 'payload' contains a complete PES payload.
898 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
899 const uint8_t *payload, int payload_size,
900 int64_t pts, int64_t dts, int key)
902 MpegTSWriteStream *ts_st = st->priv_data;
903 MpegTSWrite *ts = s->priv_data;
904 uint8_t buf[TS_PACKET_SIZE];
906 int val, is_start, len, header_len, write_pcr, is_dvb_subtitle, is_dvb_teletext, flags;
907 int afc_len, stuffing_len;
908 int64_t pcr = -1; /* avoid warning */
909 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
910 int force_pat = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key;
913 while (payload_size > 0) {
914 retransmit_si_info(s, force_pat);
918 if (ts_st->pid == ts_st->service->pcr_pid) {
919 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
920 ts_st->service->pcr_packet_count++;
921 if (ts_st->service->pcr_packet_count >=
922 ts_st->service->pcr_packet_period) {
923 ts_st->service->pcr_packet_count = 0;
928 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
929 (dts - get_pcr(ts, s->pb)/300) > delay) {
930 /* pcr insert gets priority over null packet insert */
932 mpegts_insert_pcr_only(s, st);
934 mpegts_insert_null_packet(s);
935 continue; /* recalculate write_pcr and possibly retransmit si_info */
938 /* prepare packet header */
941 val = (ts_st->pid >> 8);
946 ts_st->cc = (ts_st->cc + 1) & 0xf;
947 *q++ = 0x10 | ts_st->cc; // payload indicator + CC
948 if (key && is_start && pts != AV_NOPTS_VALUE) {
949 // set Random Access for key frames
950 if (ts_st->pid == ts_st->service->pcr_pid)
952 set_af_flag(buf, 0x40);
953 q = get_ts_payload_start(buf);
956 set_af_flag(buf, 0x10);
957 q = get_ts_payload_start(buf);
958 // add 11, pcr references the last byte of program clock reference base
959 if (ts->mux_rate > 1)
960 pcr = get_pcr(ts, s->pb);
962 pcr = (dts - delay)*300;
963 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
964 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
965 extend_af(buf, write_pcr_bits(q, pcr));
966 q = get_ts_payload_start(buf);
969 int pes_extension = 0;
970 int pes_header_stuffing_bytes = 0;
971 /* write PES header */
977 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
978 if (st->codec->codec_id == AV_CODEC_ID_DIRAC) {
982 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
983 (st->codec->codec_id == AV_CODEC_ID_MP2 ||
984 st->codec->codec_id == AV_CODEC_ID_MP3 ||
985 st->codec->codec_id == AV_CODEC_ID_AAC)) {
987 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
988 st->codec->codec_id == AV_CODEC_ID_AC3 &&
993 if(st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
994 if (st->codec->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
996 } else if (st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1003 if (pts != AV_NOPTS_VALUE) {
1007 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
1011 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
1012 st->codec->codec_id == AV_CODEC_ID_DIRAC) {
1013 /* set PES_extension_flag */
1018 * One byte for PES2 extension flag +
1019 * one byte for extension length +
1020 * one byte for extension id
1024 /* for Blu-ray AC3 Audio the PES Extension flag should be as follow
1025 * otherwise it will not play sound on blu-ray
1027 if (ts->m2ts_mode &&
1028 st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
1029 st->codec->codec_id == AV_CODEC_ID_AC3) {
1030 /* set PES_extension_flag */
1035 if (is_dvb_teletext) {
1036 pes_header_stuffing_bytes = 0x24 - header_len;
1039 len = payload_size + header_len + 3;
1040 /* 3 extra bytes should be added to DVB subtitle payload: 0x20 0x00 at the beginning and trailing 0xff */
1041 if (is_dvb_subtitle) {
1047 if (ts->omit_video_pes_length && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1053 /* data alignment indicator is required for subtitle and data streams */
1054 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE || st->codec->codec_type == AVMEDIA_TYPE_DATA)
1059 if (pts != AV_NOPTS_VALUE) {
1060 write_pts(q, flags >> 6, pts);
1063 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
1064 write_pts(q, 1, dts);
1067 if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {
1068 flags = 0x01; /* set PES_extension_flag_2 */
1070 *q++ = 0x80 | 0x01; /* marker bit + extension length */
1072 * Set the stream id extension flag bit to 0 and
1073 * write the extended stream id
1077 /* For Blu-ray AC3 Audio Setting extended flags */
1078 if (ts->m2ts_mode &&
1080 st->codec->codec_id == AV_CODEC_ID_AC3) {
1081 flags = 0x01; /* set PES_extension_flag_2 */
1083 *q++ = 0x80 | 0x01; /* marker bit + extension length */
1084 *q++ = 0x00 | 0x71; /* for AC3 Audio (specifically on blue-rays) */
1088 if (is_dvb_subtitle) {
1089 /* First two fields of DVB subtitles PES data:
1090 * data_identifier: for DVB subtitle streams shall be coded with the value 0x20
1091 * subtitle_stream_id: for DVB subtitle stream shall be identified by the value 0x00 */
1095 if (is_dvb_teletext) {
1096 memset(q, 0xff, pes_header_stuffing_bytes);
1097 q += pes_header_stuffing_bytes;
1102 header_len = q - buf;
1104 len = TS_PACKET_SIZE - header_len;
1105 if (len > payload_size)
1107 stuffing_len = TS_PACKET_SIZE - header_len - len;
1108 if (stuffing_len > 0) {
1109 /* add stuffing with AFC */
1110 if (buf[3] & 0x20) {
1111 /* stuffing already present: increase its size */
1112 afc_len = buf[4] + 1;
1113 memmove(buf + 4 + afc_len + stuffing_len,
1115 header_len - (4 + afc_len));
1116 buf[4] += stuffing_len;
1117 memset(buf + 4 + afc_len, 0xff, stuffing_len);
1120 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
1122 buf[4] = stuffing_len - 1;
1123 if (stuffing_len >= 2) {
1125 memset(buf + 6, 0xff, stuffing_len - 2);
1130 if (is_dvb_subtitle && payload_size == len) {
1131 memcpy(buf + TS_PACKET_SIZE - len, payload, len - 1);
1132 buf[TS_PACKET_SIZE - 1] = 0xff; /* end_of_PES_data_field_marker: an 8-bit field with fixed contents 0xff for DVB subtitle */
1134 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
1138 payload_size -= len;
1139 mpegts_prefix_m2ts_header(s);
1140 avio_write(s->pb, buf, TS_PACKET_SIZE);
1143 ts_st->prev_payload_key = key;
1146 int ff_check_h264_startcode(AVFormatContext *s, const AVStream *st, const AVPacket *pkt)
1148 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
1149 if (!st->nb_frames) {
1150 av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
1151 "no startcode found, use the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)\n");
1152 return AVERROR(EINVAL);
1154 av_log(s, AV_LOG_WARNING, "H.264 bitstream error, startcode missing\n");
1159 static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1161 AVStream *st = s->streams[pkt->stream_index];
1162 int size = pkt->size;
1163 uint8_t *buf= pkt->data;
1164 uint8_t *data= NULL;
1165 MpegTSWrite *ts = s->priv_data;
1166 MpegTSWriteStream *ts_st = st->priv_data;
1167 const int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
1168 int64_t dts = pkt->dts, pts = pkt->pts;
1170 if (ts->reemit_pat_pmt) {
1171 av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
1172 ts->reemit_pat_pmt = 0;
1173 ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;
1176 if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
1177 ts->pat_packet_count = ts->pat_packet_period - 1;
1178 ts->sdt_packet_count = ts->sdt_packet_period - 1;
1179 ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
1183 if (pts != AV_NOPTS_VALUE)
1185 if (dts != AV_NOPTS_VALUE)
1189 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
1190 av_log(s, AV_LOG_ERROR, "first pts value must be set\n");
1191 return AVERROR_INVALIDDATA;
1193 ts_st->first_pts_check = 0;
1195 if (st->codec->codec_id == AV_CODEC_ID_H264) {
1196 const uint8_t *p = buf, *buf_end = p+size;
1197 uint32_t state = -1;
1198 int ret = ff_check_h264_startcode(s, st, pkt);
1203 p = avpriv_find_start_code(p, buf_end, &state);
1204 av_dlog(s, "nal %d\n", state & 0x1f);
1205 } while (p < buf_end && (state & 0x1f) != 9 &&
1206 (state & 0x1f) != 5 && (state & 0x1f) != 1);
1208 if ((state & 0x1f) != 9) { // AUD NAL
1209 data = av_malloc(pkt->size+6);
1211 return AVERROR(ENOMEM);
1212 memcpy(data+6, pkt->data, pkt->size);
1213 AV_WB32(data, 0x00000001);
1215 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1219 } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {
1220 if (pkt->size < 2) {
1221 av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
1222 return AVERROR_INVALIDDATA;
1224 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
1229 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
1230 "and extradata missing\n");
1231 return AVERROR_INVALIDDATA;
1234 av_init_packet(&pkt2);
1235 pkt2.data = pkt->data;
1236 pkt2.size = pkt->size;
1237 av_assert0(pkt->dts != AV_NOPTS_VALUE);
1238 pkt2.dts = av_rescale_q(pkt->dts, st->time_base, ts_st->amux->streams[0]->time_base);
1239 ret = avio_open_dyn_buf(&ts_st->amux->pb);
1241 return AVERROR(ENOMEM);
1243 ret = av_write_frame(ts_st->amux, &pkt2);
1245 avio_close_dyn_buf(ts_st->amux->pb, &data);
1246 ts_st->amux->pb = NULL;
1250 size = avio_close_dyn_buf(ts_st->amux->pb, &data);
1251 ts_st->amux->pb = NULL;
1256 if (pkt->dts != AV_NOPTS_VALUE) {
1258 for(i=0; i<s->nb_streams; i++){
1259 AVStream *st2 = s->streams[i];
1260 MpegTSWriteStream *ts_st2 = st2->priv_data;
1261 if( ts_st2->payload_size
1262 && (ts_st2->payload_dts == AV_NOPTS_VALUE || dts - ts_st2->payload_dts > delay/2)){
1263 mpegts_write_pes(s, st2, ts_st2->payload, ts_st2->payload_size,
1264 ts_st2->payload_pts, ts_st2->payload_dts,
1265 ts_st2->payload_flags & AV_PKT_FLAG_KEY);
1266 ts_st2->payload_size = 0;
1271 if (ts_st->payload_size && ts_st->payload_size + size > ts->pes_payload_size) {
1272 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1273 ts_st->payload_pts, ts_st->payload_dts,
1274 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1275 ts_st->payload_size = 0;
1278 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO || size > ts->pes_payload_size) {
1279 av_assert0(!ts_st->payload_size);
1280 // for video and subtitle, write a single pes packet
1281 mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);
1286 if (!ts_st->payload_size) {
1287 ts_st->payload_pts = pts;
1288 ts_st->payload_dts = dts;
1289 ts_st->payload_flags = pkt->flags;
1292 memcpy(ts_st->payload + ts_st->payload_size, buf, size);
1293 ts_st->payload_size += size;
1300 static void mpegts_write_flush(AVFormatContext *s)
1304 /* flush current packets */
1305 for(i = 0; i < s->nb_streams; i++) {
1306 AVStream *st = s->streams[i];
1307 MpegTSWriteStream *ts_st = st->priv_data;
1308 if (ts_st->payload_size > 0) {
1309 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1310 ts_st->payload_pts, ts_st->payload_dts,
1311 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1312 ts_st->payload_size = 0;
1318 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
1321 mpegts_write_flush(s);
1324 return mpegts_write_packet_internal(s, pkt);
1328 static int mpegts_write_end(AVFormatContext *s)
1330 MpegTSWrite *ts = s->priv_data;
1331 MpegTSService *service;
1334 mpegts_write_flush(s);
1336 for(i = 0; i < s->nb_streams; i++) {
1337 AVStream *st = s->streams[i];
1338 MpegTSWriteStream *ts_st = st->priv_data;
1339 av_freep(&ts_st->payload);
1341 avformat_free_context(ts_st->amux);
1346 for(i = 0; i < ts->nb_services; i++) {
1347 service = ts->services[i];
1348 av_freep(&service->provider_name);
1349 av_freep(&service->name);
1352 av_free(ts->services);
1357 static const AVOption options[] = {
1358 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
1359 offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
1360 { "mpegts_original_network_id", "Set original_network_id field.",
1361 offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
1362 { "mpegts_service_id", "Set service_id field.",
1363 offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
1364 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
1365 offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
1366 { "mpegts_start_pid", "Set the first pid.",
1367 offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
1368 {"mpegts_m2ts_mode", "Enable m2ts mode.",
1369 offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.i64 = -1 },
1370 -1,1, AV_OPT_FLAG_ENCODING_PARAM},
1371 { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
1372 { "pes_payload_size", "Minimum PES packet payload in bytes",
1373 offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
1374 { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX,
1375 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1376 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1377 0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,
1378 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
1379 { "latm", "Use LATM packetization for AAC",
1380 0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,
1381 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
1382 // backward compatibility
1383 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1384 offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
1385 { "mpegts_copyts", "don't offset dts/pts",
1386 offsetof(MpegTSWrite, copyts), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
1387 { "tables_version", "set PAT, PMT and SDT version",
1388 offsetof(MpegTSWrite, tables_version), AV_OPT_TYPE_INT, {.i64=0}, 0, 31, AV_OPT_FLAG_ENCODING_PARAM},
1389 { "omit_video_pes_length", "Omit the PES packet length for video packets",
1390 offsetof(MpegTSWrite, omit_video_pes_length), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
1391 { "pcr_period", "PCR retransmission time",
1392 offsetof(MpegTSWrite, pcr_period), AV_OPT_TYPE_INT, { .i64 = PCR_RETRANS_TIME }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1396 static const AVClass mpegts_muxer_class = {
1397 .class_name = "MPEGTS muxer",
1398 .item_name = av_default_item_name,
1400 .version = LIBAVUTIL_VERSION_INT,
1403 AVOutputFormat ff_mpegts_muxer = {
1405 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
1406 .mime_type = "video/MP2T",
1407 .extensions = "ts,m2t,m2ts,mts",
1408 .priv_data_size = sizeof(MpegTSWrite),
1409 .audio_codec = AV_CODEC_ID_MP2,
1410 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1411 .write_header = mpegts_write_header,
1412 .write_packet = mpegts_write_packet,
1413 .write_trailer = mpegts_write_end,
1414 .flags = AVFMT_ALLOW_FLUSH,
1415 .priv_class = &mpegts_muxer_class,