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/opt.h"
25 #include "libavcodec/mpegvideo.h"
31 #define PCR_TIME_BASE 27000000
33 /* write DVB SI sections */
35 /*********************************************/
36 /* mpegts section writer */
38 typedef struct MpegTSSection {
41 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
45 typedef struct MpegTSService {
46 MpegTSSection pmt; /* MPEG2 pmt table context */
47 int sid; /* service ID */
52 int pcr_packet_period;
55 typedef struct MpegTSWrite {
56 const AVClass *av_class;
57 MpegTSSection pat; /* MPEG2 pat table */
58 MpegTSSection sdt; /* MPEG2 sdt table context */
59 MpegTSService **services;
61 int sdt_packet_period;
63 int pat_packet_period;
68 int mux_rate; ///< set to 1 when VBR
70 int transport_stream_id;
71 int original_network_id;
78 static const AVOption options[] = {
79 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
80 offsetof(MpegTSWrite, transport_stream_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
81 { "mpegts_original_network_id", "Set original_network_id field.",
82 offsetof(MpegTSWrite, original_network_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
83 { "mpegts_service_id", "Set service_id field.",
84 offsetof(MpegTSWrite, service_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
85 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
86 offsetof(MpegTSWrite, pmt_start_pid), FF_OPT_TYPE_INT, {.dbl = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
87 { "mpegts_start_pid", "Set the first pid.",
88 offsetof(MpegTSWrite, start_pid), FF_OPT_TYPE_INT, {.dbl = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
92 static const AVClass mpegts_muxer_class = {
93 .class_name = "MPEGTS muxer",
94 .item_name = av_default_item_name,
96 .version = LIBAVUTIL_VERSION_INT,
99 /* NOTE: 4 bytes must be left at the end for the crc32 */
100 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
103 unsigned char packet[TS_PACKET_SIZE];
104 const unsigned char *buf_ptr;
106 int first, b, len1, left;
108 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
109 buf[len - 4] = (crc >> 24) & 0xff;
110 buf[len - 3] = (crc >> 16) & 0xff;
111 buf[len - 2] = (crc >> 8) & 0xff;
112 buf[len - 1] = (crc) & 0xff;
114 /* send each packet */
117 first = (buf == buf_ptr);
125 s->cc = (s->cc + 1) & 0xf;
128 *q++ = 0; /* 0 offset */
129 len1 = TS_PACKET_SIZE - (q - packet);
132 memcpy(q, buf_ptr, len1);
134 /* add known padding data */
135 left = TS_PACKET_SIZE - (q - packet);
137 memset(q, 0xff, left);
139 s->write_packet(s, packet);
146 static inline void put16(uint8_t **q_ptr, int val)
155 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
156 int version, int sec_num, int last_sec_num,
157 uint8_t *buf, int len)
159 uint8_t section[1024], *q;
160 unsigned int tot_len;
161 /* reserved_future_use field must be set to 1 for SDT */
162 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
164 tot_len = 3 + 5 + len + 4;
165 /* check if not too big */
171 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
173 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
178 mpegts_write_section(s, section, tot_len);
182 /*********************************************/
185 #define DEFAULT_PROVIDER_NAME "FFmpeg"
186 #define DEFAULT_SERVICE_NAME "Service01"
188 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
189 #define DEFAULT_PES_HEADER_FREQ 16
190 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
192 /* we retransmit the SI info at this rate */
193 #define SDT_RETRANS_TIME 500
194 #define PAT_RETRANS_TIME 100
195 #define PCR_RETRANS_TIME 20
197 typedef struct MpegTSWriteStream {
198 struct MpegTSService *service;
199 int pid; /* stream associated pid */
202 int first_pts_check; ///< first pts check needed
205 uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
209 static void mpegts_write_pat(AVFormatContext *s)
211 MpegTSWrite *ts = s->priv_data;
212 MpegTSService *service;
213 uint8_t data[1012], *q;
217 for(i = 0; i < ts->nb_services; i++) {
218 service = ts->services[i];
219 put16(&q, service->sid);
220 put16(&q, 0xe000 | service->pmt.pid);
222 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
226 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
228 // MpegTSWrite *ts = s->priv_data;
229 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
230 int val, stream_type, i;
233 put16(&q, 0xe000 | service->pcr_pid);
235 program_info_length_ptr = q;
236 q += 2; /* patched after */
238 /* put program info here */
240 val = 0xf000 | (q - program_info_length_ptr - 2);
241 program_info_length_ptr[0] = val >> 8;
242 program_info_length_ptr[1] = val;
244 for(i = 0; i < s->nb_streams; i++) {
245 AVStream *st = s->streams[i];
246 MpegTSWriteStream *ts_st = st->priv_data;
247 AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0);
248 switch(st->codec->codec_id) {
249 case CODEC_ID_MPEG1VIDEO:
250 case CODEC_ID_MPEG2VIDEO:
251 stream_type = STREAM_TYPE_VIDEO_MPEG2;
254 stream_type = STREAM_TYPE_VIDEO_MPEG4;
257 stream_type = STREAM_TYPE_VIDEO_H264;
260 stream_type = STREAM_TYPE_VIDEO_DIRAC;
264 stream_type = STREAM_TYPE_AUDIO_MPEG1;
267 stream_type = STREAM_TYPE_AUDIO_AAC;
269 case CODEC_ID_AAC_LATM:
270 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
273 stream_type = STREAM_TYPE_AUDIO_AC3;
276 stream_type = STREAM_TYPE_PRIVATE_DATA;
280 put16(&q, 0xe000 | ts_st->pid);
282 q += 2; /* patched after */
284 /* write optional descriptors here */
285 switch(st->codec->codec_type) {
286 case AVMEDIA_TYPE_AUDIO:
289 char *next = lang->value;
292 *q++ = 0x0a; /* ISO 639 language descriptor */
296 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
297 next = strchr(p, ',');
298 if (strlen(p) != 3 && (!next || next != p + 3))
299 continue; /* not a 3-letter code */
305 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
307 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
309 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
312 *q++ = 0; /* undefined type */
318 q -= 2; /* no language codes were written */
321 case AVMEDIA_TYPE_SUBTITLE:
323 const char *language;
324 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
330 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
331 if(st->codec->extradata_size == 4) {
332 memcpy(q, st->codec->extradata, 4);
335 put16(&q, 1); /* page id */
336 put16(&q, 1); /* ancillary page id */
340 case AVMEDIA_TYPE_VIDEO:
341 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
342 *q++ = 0x05; /*MPEG-2 registration descriptor*/
352 val = 0xf000 | (q - desc_length_ptr - 2);
353 desc_length_ptr[0] = val >> 8;
354 desc_length_ptr[1] = val;
356 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
360 /* NOTE: str == NULL is accepted for an empty string */
361 static void putstr8(uint8_t **q_ptr, const char *str)
377 static void mpegts_write_sdt(AVFormatContext *s)
379 MpegTSWrite *ts = s->priv_data;
380 MpegTSService *service;
381 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
382 int i, running_status, free_ca_mode, val;
387 for(i = 0; i < ts->nb_services; i++) {
388 service = ts->services[i];
389 put16(&q, service->sid);
390 *q++ = 0xfc | 0x00; /* currently no EIT info */
391 desc_list_len_ptr = q;
393 running_status = 4; /* running */
396 /* write only one descriptor for the service name and provider */
400 *q++ = 0x01; /* digital television service */
401 putstr8(&q, service->provider_name);
402 putstr8(&q, service->name);
403 desc_len_ptr[0] = q - desc_len_ptr - 1;
405 /* fill descriptor length */
406 val = (running_status << 13) | (free_ca_mode << 12) |
407 (q - desc_list_len_ptr - 2);
408 desc_list_len_ptr[0] = val >> 8;
409 desc_list_len_ptr[1] = val;
411 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
415 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
417 const char *provider_name,
420 MpegTSService *service;
422 service = av_mallocz(sizeof(MpegTSService));
425 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
427 service->provider_name = av_strdup(provider_name);
428 service->name = av_strdup(name);
429 service->pcr_pid = 0x1fff;
430 dynarray_add(&ts->services, &ts->nb_services, service);
434 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
436 AVFormatContext *ctx = s->opaque;
437 avio_write(ctx->pb, packet, TS_PACKET_SIZE);
440 static int mpegts_write_header(AVFormatContext *s)
442 MpegTSWrite *ts = s->priv_data;
443 MpegTSWriteStream *ts_st;
444 MpegTSService *service;
445 AVStream *st, *pcr_st = NULL;
446 AVMetadataTag *title, *provider;
448 const char *service_name;
449 const char *provider_name;
452 ts->tsid = ts->transport_stream_id;
453 ts->onid = ts->original_network_id;
454 /* allocate a single DVB service */
455 title = av_metadata_get(s->metadata, "service_name", NULL, 0);
457 title = av_metadata_get(s->metadata, "title", NULL, 0);
458 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
459 provider = av_metadata_get(s->metadata, "service_provider", NULL, 0);
460 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
461 service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
462 service->pmt.write_packet = section_write_packet;
463 service->pmt.opaque = s;
464 service->pmt.cc = 15;
466 ts->pat.pid = PAT_PID;
467 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
468 ts->pat.write_packet = section_write_packet;
471 ts->sdt.pid = SDT_PID;
473 ts->sdt.write_packet = section_write_packet;
476 pids = av_malloc(s->nb_streams * sizeof(*pids));
478 return AVERROR(ENOMEM);
480 /* assign pids to each stream */
481 for(i = 0;i < s->nb_streams; i++) {
483 av_set_pts_info(st, 33, 1, 90000);
484 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
487 st->priv_data = ts_st;
488 ts_st->service = service;
489 /* MPEG pid values < 16 are reserved. Applications which set st->id in
490 * this range are assigned a calculated pid. */
492 ts_st->pid = ts->start_pid + i;
493 } else if (st->id < 0x1FFF) {
496 av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
499 if (ts_st->pid == service->pmt.pid) {
500 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
503 for (j = 0; j < i; j++)
504 if (pids[j] == ts_st->pid) {
505 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
508 pids[i] = ts_st->pid;
509 ts_st->payload_pts = AV_NOPTS_VALUE;
510 ts_st->payload_dts = AV_NOPTS_VALUE;
511 ts_st->first_pts_check = 1;
513 /* update PCR pid by using the first video stream */
514 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
515 service->pcr_pid == 0x1fff) {
516 service->pcr_pid = ts_st->pid;
519 if (st->codec->codec_id == CODEC_ID_AAC &&
520 st->codec->extradata_size > 0) {
521 ts_st->adts = av_mallocz(sizeof(*ts_st->adts));
523 return AVERROR(ENOMEM);
524 if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata,
525 st->codec->extradata_size) < 0)
532 /* if no video stream, use the first stream as PCR */
533 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
534 pcr_st = s->streams[0];
535 ts_st = pcr_st->priv_data;
536 service->pcr_pid = ts_st->pid;
539 ts->mux_rate = s->mux_rate ? s->mux_rate : 1;
541 if (ts->mux_rate > 1) {
542 service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
543 (TS_PACKET_SIZE * 8 * 1000);
544 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
545 (TS_PACKET_SIZE * 8 * 1000);
546 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
547 (TS_PACKET_SIZE * 8 * 1000);
549 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
551 /* Arbitrary values, PAT/PMT could be written on key frames */
552 ts->sdt_packet_period = 200;
553 ts->pat_packet_period = 40;
554 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
555 if (!pcr_st->codec->frame_size) {
556 av_log(s, AV_LOG_WARNING, "frame size not set\n");
557 service->pcr_packet_period =
558 pcr_st->codec->sample_rate/(10*512);
560 service->pcr_packet_period =
561 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
564 // max delta PCR 0.1s
565 service->pcr_packet_period =
566 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
570 // output a PCR as soon as possible
571 service->pcr_packet_count = service->pcr_packet_period;
572 ts->pat_packet_count = ts->pat_packet_period-1;
573 ts->sdt_packet_count = ts->sdt_packet_period-1;
575 if (ts->mux_rate == 1)
576 av_log(s, AV_LOG_INFO, "muxrate VBR, ");
578 av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);
579 av_log(s, AV_LOG_INFO, "pcr every %d pkts, "
580 "sdt every %d, pat/pmt every %d pkts\n",
581 service->pcr_packet_period,
582 ts->sdt_packet_period, ts->pat_packet_period);
590 for(i = 0;i < s->nb_streams; i++) {
592 av_freep(&st->priv_data);
597 /* send SDT, PAT and PMT tables regulary */
598 static void retransmit_si_info(AVFormatContext *s)
600 MpegTSWrite *ts = s->priv_data;
603 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
604 ts->sdt_packet_count = 0;
607 if (++ts->pat_packet_count == ts->pat_packet_period) {
608 ts->pat_packet_count = 0;
610 for(i = 0; i < ts->nb_services; i++) {
611 mpegts_write_pmt(s, ts->services[i]);
616 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
618 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
622 static uint8_t* write_pcr_bits(uint8_t *buf, int64_t pcr)
624 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
626 *buf++ = pcr_high >> 25;
627 *buf++ = pcr_high >> 17;
628 *buf++ = pcr_high >> 9;
629 *buf++ = pcr_high >> 1;
630 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
636 /* Write a single null transport stream packet */
637 static void mpegts_insert_null_packet(AVFormatContext *s)
640 uint8_t buf[TS_PACKET_SIZE];
647 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
648 avio_write(s->pb, buf, TS_PACKET_SIZE);
651 /* Write a single transport stream packet with a PCR and no payload */
652 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
654 MpegTSWrite *ts = s->priv_data;
655 MpegTSWriteStream *ts_st = st->priv_data;
657 uint8_t buf[TS_PACKET_SIZE];
661 *q++ = ts_st->pid >> 8;
663 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
664 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
665 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
666 *q++ = 0x10; /* Adaptation flags: PCR present */
668 /* PCR coded into 6 bytes */
669 q = write_pcr_bits(q, get_pcr(ts, s->pb));
672 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
673 avio_write(s->pb, buf, TS_PACKET_SIZE);
676 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
680 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
682 val = (((pts >> 15) & 0x7fff) << 1) | 1;
685 val = (((pts) & 0x7fff) << 1) | 1;
690 /* Add a pes header to the front of payload, and segment into an integer number of
691 * ts packets. The final ts packet is padded using an over-sized adaptation header
692 * to exactly fill the last ts packet.
693 * NOTE: 'payload' contains a complete PES payload.
695 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
696 const uint8_t *payload, int payload_size,
697 int64_t pts, int64_t dts)
699 MpegTSWriteStream *ts_st = st->priv_data;
700 MpegTSWrite *ts = s->priv_data;
701 uint8_t buf[TS_PACKET_SIZE];
703 int val, is_start, len, header_len, write_pcr, private_code, flags;
704 int afc_len, stuffing_len;
705 int64_t pcr = -1; /* avoid warning */
706 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
709 while (payload_size > 0) {
710 retransmit_si_info(s);
713 if (ts_st->pid == ts_st->service->pcr_pid) {
714 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
715 ts_st->service->pcr_packet_count++;
716 if (ts_st->service->pcr_packet_count >=
717 ts_st->service->pcr_packet_period) {
718 ts_st->service->pcr_packet_count = 0;
723 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
724 (dts - get_pcr(ts, s->pb)/300) > delay) {
725 /* pcr insert gets priority over null packet insert */
727 mpegts_insert_pcr_only(s, st);
729 mpegts_insert_null_packet(s);
730 continue; /* recalculate write_pcr and possibly retransmit si_info */
733 /* prepare packet header */
736 val = (ts_st->pid >> 8);
741 ts_st->cc = (ts_st->cc + 1) & 0xf;
742 *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
744 // add 11, pcr references the last byte of program clock reference base
745 if (ts->mux_rate > 1)
746 pcr = get_pcr(ts, s->pb);
748 pcr = (dts - delay)*300;
749 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
750 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
751 *q++ = 7; /* AFC length */
752 *q++ = 0x10; /* flags: PCR present */
753 q = write_pcr_bits(q, pcr);
756 int pes_extension = 0;
757 /* write PES header */
762 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
763 if (st->codec->codec_id == CODEC_ID_DIRAC) {
767 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
768 (st->codec->codec_id == CODEC_ID_MP2 ||
769 st->codec->codec_id == CODEC_ID_MP3 ||
770 st->codec->codec_id == CODEC_ID_AAC)) {
774 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
780 if (pts != AV_NOPTS_VALUE) {
784 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
788 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
789 st->codec->codec_id == CODEC_ID_DIRAC) {
790 /* set PES_extension_flag */
795 * One byte for PES2 extension flag +
796 * one byte for extension length +
797 * one byte for extension id
801 len = payload_size + header_len + 3;
802 if (private_code != 0)
809 /* data alignment indicator is required for subtitle data */
810 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
815 if (pts != AV_NOPTS_VALUE) {
816 write_pts(q, flags >> 6, pts);
819 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
820 write_pts(q, 1, dts);
823 if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
824 flags = 0x01; /* set PES_extension_flag_2 */
826 *q++ = 0x80 | 0x01; /* marker bit + extension length */
828 * Set the stream id extension flag bit to 0 and
829 * write the extended stream id
833 if (private_code != 0)
838 header_len = q - buf;
840 len = TS_PACKET_SIZE - header_len;
841 if (len > payload_size)
843 stuffing_len = TS_PACKET_SIZE - header_len - len;
844 if (stuffing_len > 0) {
845 /* add stuffing with AFC */
847 /* stuffing already present: increase its size */
848 afc_len = buf[4] + 1;
849 memmove(buf + 4 + afc_len + stuffing_len,
851 header_len - (4 + afc_len));
852 buf[4] += stuffing_len;
853 memset(buf + 4 + afc_len, 0xff, stuffing_len);
856 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
858 buf[4] = stuffing_len - 1;
859 if (stuffing_len >= 2) {
861 memset(buf + 6, 0xff, stuffing_len - 2);
865 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
868 avio_write(s->pb, buf, TS_PACKET_SIZE);
873 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
875 AVStream *st = s->streams[pkt->stream_index];
876 int size = pkt->size;
877 uint8_t *buf= pkt->data;
879 MpegTSWriteStream *ts_st = st->priv_data;
880 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
881 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
883 if (pkt->pts != AV_NOPTS_VALUE)
884 pts = pkt->pts + delay;
885 if (pkt->dts != AV_NOPTS_VALUE)
886 dts = pkt->dts + delay;
888 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
889 av_log(s, AV_LOG_ERROR, "first pts value must set\n");
892 ts_st->first_pts_check = 0;
894 if (st->codec->codec_id == CODEC_ID_H264) {
895 const uint8_t *p = buf, *buf_end = p+size;
898 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
899 av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, "
900 "no startcode found, use -vbsf h264_mp4toannexb\n");
905 p = ff_find_start_code(p, buf_end, &state);
906 //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);
907 } while (p < buf_end && (state & 0x1f) != 9 &&
908 (state & 0x1f) != 5 && (state & 0x1f) != 1);
910 if ((state & 0x1f) != 9) { // AUD NAL
911 data = av_malloc(pkt->size+6);
914 memcpy(data+6, pkt->data, pkt->size);
915 AV_WB32(data, 0x00000001);
917 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
921 } else if (st->codec->codec_id == CODEC_ID_AAC) {
924 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
925 ADTSContext *adts = ts_st->adts;
928 av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "
929 "and extradata missing\n");
932 new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;
933 if ((unsigned)new_size >= INT_MAX)
935 data = av_malloc(new_size);
937 return AVERROR(ENOMEM);
938 ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size);
939 if (adts->pce_size) {
940 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);
943 memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);
949 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
950 // for video and subtitle, write a single pes packet
951 mpegts_write_pes(s, st, buf, size, pts, dts);
956 if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {
957 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
958 ts_st->payload_pts, ts_st->payload_dts);
959 ts_st->payload_index = 0;
962 if (!ts_st->payload_index) {
963 ts_st->payload_pts = pts;
964 ts_st->payload_dts = dts;
967 memcpy(ts_st->payload + ts_st->payload_index, buf, size);
968 ts_st->payload_index += size;
975 static int mpegts_write_end(AVFormatContext *s)
977 MpegTSWrite *ts = s->priv_data;
978 MpegTSWriteStream *ts_st;
979 MpegTSService *service;
983 /* flush current packets */
984 for(i = 0; i < s->nb_streams; i++) {
986 ts_st = st->priv_data;
987 if (ts_st->payload_index > 0) {
988 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
989 ts_st->payload_pts, ts_st->payload_dts);
991 av_freep(&ts_st->adts);
995 for(i = 0; i < ts->nb_services; i++) {
996 service = ts->services[i];
997 av_freep(&service->provider_name);
998 av_freep(&service->name);
1001 av_free(ts->services);
1006 AVOutputFormat ff_mpegts_muxer = {
1008 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1011 sizeof(MpegTSWrite),
1013 CODEC_ID_MPEG2VIDEO,
1014 mpegts_write_header,
1015 mpegts_write_packet,
1017 .priv_class = &mpegts_muxer_class,