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 "libavcodec/mpegvideo.h"
30 #define PCR_TIME_BASE 27000000
32 /* write DVB SI sections */
34 /*********************************************/
35 /* mpegts section writer */
37 typedef struct MpegTSSection {
40 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
44 typedef struct MpegTSService {
45 MpegTSSection pmt; /* MPEG2 pmt table context */
46 int sid; /* service ID */
51 int pcr_packet_period;
54 typedef struct MpegTSWrite {
55 MpegTSSection pat; /* MPEG2 pat table */
56 MpegTSSection sdt; /* MPEG2 sdt table context */
57 MpegTSService **services;
59 int sdt_packet_period;
61 int pat_packet_period;
66 int mux_rate; ///< set to 1 when VBR
69 /* NOTE: 4 bytes must be left at the end for the crc32 */
70 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
72 MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data;
74 unsigned char packet[TS_PACKET_SIZE];
75 const unsigned char *buf_ptr;
77 int first, b, len1, left;
79 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
80 buf[len - 4] = (crc >> 24) & 0xff;
81 buf[len - 3] = (crc >> 16) & 0xff;
82 buf[len - 2] = (crc >> 8) & 0xff;
83 buf[len - 1] = (crc) & 0xff;
85 /* send each packet */
88 first = (buf == buf_ptr);
96 s->cc = (s->cc + 1) & 0xf;
99 *q++ = 0; /* 0 offset */
100 len1 = TS_PACKET_SIZE - (q - packet);
103 memcpy(q, buf_ptr, len1);
105 /* add known padding data */
106 left = TS_PACKET_SIZE - (q - packet);
108 memset(q, 0xff, left);
110 s->write_packet(s, packet);
117 static inline void put16(uint8_t **q_ptr, int val)
126 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
127 int version, int sec_num, int last_sec_num,
128 uint8_t *buf, int len)
130 uint8_t section[1024], *q;
131 unsigned int tot_len;
133 tot_len = 3 + 5 + len + 4;
134 /* check if not too big */
140 put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
142 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
147 mpegts_write_section(s, section, tot_len);
151 /*********************************************/
154 #define DEFAULT_PMT_START_PID 0x1000
155 #define DEFAULT_START_PID 0x0100
156 #define DEFAULT_PROVIDER_NAME "FFmpeg"
157 #define DEFAULT_SERVICE_NAME "Service01"
159 /* default network id, transport stream and service identifiers */
160 #define DEFAULT_ONID 0x0001
161 #define DEFAULT_TSID 0x0001
162 #define DEFAULT_SID 0x0001
164 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
165 #define DEFAULT_PES_HEADER_FREQ 16
166 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
168 /* we retransmit the SI info at this rate */
169 #define SDT_RETRANS_TIME 500
170 #define PAT_RETRANS_TIME 100
171 #define PCR_RETRANS_TIME 20
173 typedef struct MpegTSWriteStream {
174 struct MpegTSService *service;
175 int pid; /* stream associated pid */
178 int first_pts_check; ///< first pts check needed
181 uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
185 static void mpegts_write_pat(AVFormatContext *s)
187 MpegTSWrite *ts = s->priv_data;
188 MpegTSService *service;
189 uint8_t data[1012], *q;
193 for(i = 0; i < ts->nb_services; i++) {
194 service = ts->services[i];
195 put16(&q, service->sid);
196 put16(&q, 0xe000 | service->pmt.pid);
198 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
202 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
204 // MpegTSWrite *ts = s->priv_data;
205 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
206 int val, stream_type, i;
209 put16(&q, 0xe000 | service->pcr_pid);
211 program_info_length_ptr = q;
212 q += 2; /* patched after */
214 /* put program info here */
216 val = 0xf000 | (q - program_info_length_ptr - 2);
217 program_info_length_ptr[0] = val >> 8;
218 program_info_length_ptr[1] = val;
220 for(i = 0; i < s->nb_streams; i++) {
221 AVStream *st = s->streams[i];
222 MpegTSWriteStream *ts_st = st->priv_data;
223 AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0);
224 switch(st->codec->codec_id) {
225 case CODEC_ID_MPEG1VIDEO:
226 case CODEC_ID_MPEG2VIDEO:
227 stream_type = STREAM_TYPE_VIDEO_MPEG2;
230 stream_type = STREAM_TYPE_VIDEO_MPEG4;
233 stream_type = STREAM_TYPE_VIDEO_H264;
236 stream_type = STREAM_TYPE_VIDEO_DIRAC;
240 stream_type = STREAM_TYPE_AUDIO_MPEG1;
243 stream_type = STREAM_TYPE_AUDIO_AAC;
246 stream_type = STREAM_TYPE_AUDIO_AC3;
249 stream_type = STREAM_TYPE_PRIVATE_DATA;
253 put16(&q, 0xe000 | ts_st->pid);
255 q += 2; /* patched after */
257 /* write optional descriptors here */
258 switch(st->codec->codec_type) {
259 case AVMEDIA_TYPE_AUDIO:
260 if (lang && strlen(lang->value) == 3) {
261 *q++ = 0x0a; /* ISO 639 language descriptor */
263 *q++ = lang->value[0];
264 *q++ = lang->value[1];
265 *q++ = lang->value[2];
266 *q++ = 0; /* undefined type */
269 case AVMEDIA_TYPE_SUBTITLE:
271 const char *language;
272 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
278 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
279 if(st->codec->extradata_size == 4) {
280 memcpy(q, st->codec->extradata, 4);
283 put16(&q, 1); /* page id */
284 put16(&q, 1); /* ancillary page id */
288 case AVMEDIA_TYPE_VIDEO:
289 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
290 *q++ = 0x05; /*MPEG-2 registration descriptor*/
300 val = 0xf000 | (q - desc_length_ptr - 2);
301 desc_length_ptr[0] = val >> 8;
302 desc_length_ptr[1] = val;
304 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
308 /* NOTE: str == NULL is accepted for an empty string */
309 static void putstr8(uint8_t **q_ptr, const char *str)
325 static void mpegts_write_sdt(AVFormatContext *s)
327 MpegTSWrite *ts = s->priv_data;
328 MpegTSService *service;
329 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
330 int i, running_status, free_ca_mode, val;
335 for(i = 0; i < ts->nb_services; i++) {
336 service = ts->services[i];
337 put16(&q, service->sid);
338 *q++ = 0xfc | 0x00; /* currently no EIT info */
339 desc_list_len_ptr = q;
341 running_status = 4; /* running */
344 /* write only one descriptor for the service name and provider */
348 *q++ = 0x01; /* digital television service */
349 putstr8(&q, service->provider_name);
350 putstr8(&q, service->name);
351 desc_len_ptr[0] = q - desc_len_ptr - 1;
353 /* fill descriptor length */
354 val = (running_status << 13) | (free_ca_mode << 12) |
355 (q - desc_list_len_ptr - 2);
356 desc_list_len_ptr[0] = val >> 8;
357 desc_list_len_ptr[1] = val;
359 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
363 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
365 const char *provider_name,
368 MpegTSService *service;
370 service = av_mallocz(sizeof(MpegTSService));
373 service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
375 service->provider_name = av_strdup(provider_name);
376 service->name = av_strdup(name);
377 service->pcr_pid = 0x1fff;
378 dynarray_add(&ts->services, &ts->nb_services, service);
382 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
384 AVFormatContext *ctx = s->opaque;
385 put_buffer(ctx->pb, packet, TS_PACKET_SIZE);
388 static int mpegts_write_header(AVFormatContext *s)
390 MpegTSWrite *ts = s->priv_data;
391 MpegTSWriteStream *ts_st;
392 MpegTSService *service;
393 AVStream *st, *pcr_st = NULL;
394 AVMetadataTag *title;
396 const char *service_name;
399 ts->tsid = DEFAULT_TSID;
400 ts->onid = DEFAULT_ONID;
401 /* allocate a single DVB service */
402 title = av_metadata_get(s->metadata, "title", NULL, 0);
403 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
404 service = mpegts_add_service(ts, DEFAULT_SID,
405 DEFAULT_PROVIDER_NAME, service_name);
406 service->pmt.write_packet = section_write_packet;
407 service->pmt.opaque = s;
408 service->pmt.cc = 15;
410 ts->pat.pid = PAT_PID;
411 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
412 ts->pat.write_packet = section_write_packet;
415 ts->sdt.pid = SDT_PID;
417 ts->sdt.write_packet = section_write_packet;
420 pids = av_malloc(s->nb_streams * sizeof(*pids));
422 return AVERROR(ENOMEM);
424 /* assign pids to each stream */
425 for(i = 0;i < s->nb_streams; i++) {
427 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
430 st->priv_data = ts_st;
431 ts_st->service = service;
432 /* MPEG pid values < 16 are reserved. Applications which set st->id in
433 * this range are assigned a calculated pid. */
435 ts_st->pid = DEFAULT_START_PID + i;
436 } else if (st->id < 0x1FFF) {
439 av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
442 if (ts_st->pid == service->pmt.pid) {
443 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
446 for (j = 0; j < i; j++)
447 if (pids[j] == ts_st->pid) {
448 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
451 pids[i] = ts_st->pid;
452 ts_st->payload_pts = AV_NOPTS_VALUE;
453 ts_st->payload_dts = AV_NOPTS_VALUE;
454 ts_st->first_pts_check = 1;
456 /* update PCR pid by using the first video stream */
457 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
458 service->pcr_pid == 0x1fff) {
459 service->pcr_pid = ts_st->pid;
462 if (st->codec->codec_id == CODEC_ID_AAC &&
463 st->codec->extradata_size > 0) {
464 ts_st->adts = av_mallocz(sizeof(*ts_st->adts));
466 return AVERROR(ENOMEM);
467 if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata,
468 st->codec->extradata_size) < 0)
475 /* if no video stream, use the first stream as PCR */
476 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
477 pcr_st = s->streams[0];
478 ts_st = pcr_st->priv_data;
479 service->pcr_pid = ts_st->pid;
482 ts->mux_rate = s->mux_rate ? s->mux_rate : 1;
484 if (ts->mux_rate > 1) {
485 service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
486 (TS_PACKET_SIZE * 8 * 1000);
487 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
488 (TS_PACKET_SIZE * 8 * 1000);
489 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
490 (TS_PACKET_SIZE * 8 * 1000);
492 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
494 /* Arbitrary values, PAT/PMT could be written on key frames */
495 ts->sdt_packet_period = 200;
496 ts->pat_packet_period = 40;
497 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
498 if (!pcr_st->codec->frame_size) {
499 av_log(s, AV_LOG_WARNING, "frame size not set\n");
500 service->pcr_packet_period =
501 pcr_st->codec->sample_rate/(10*512);
503 service->pcr_packet_period =
504 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
507 // max delta PCR 0.1s
508 service->pcr_packet_period =
509 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
513 // output a PCR as soon as possible
514 service->pcr_packet_count = service->pcr_packet_period;
515 ts->pat_packet_count = ts->pat_packet_period-1;
516 ts->sdt_packet_count = ts->sdt_packet_period-1;
518 if (ts->mux_rate == 1)
519 av_log(s, AV_LOG_INFO, "muxrate VBR, ");
521 av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);
522 av_log(s, AV_LOG_INFO, "pcr every %d pkts, "
523 "sdt every %d, pat/pmt every %d pkts\n",
524 service->pcr_packet_period,
525 ts->sdt_packet_period, ts->pat_packet_period);
527 put_flush_packet(s->pb);
533 for(i = 0;i < s->nb_streams; i++) {
535 av_free(st->priv_data);
540 /* send SDT, PAT and PMT tables regulary */
541 static void retransmit_si_info(AVFormatContext *s)
543 MpegTSWrite *ts = s->priv_data;
546 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
547 ts->sdt_packet_count = 0;
550 if (++ts->pat_packet_count == ts->pat_packet_period) {
551 ts->pat_packet_count = 0;
553 for(i = 0; i < ts->nb_services; i++) {
554 mpegts_write_pmt(s, ts->services[i]);
559 static int64_t get_pcr(const MpegTSWrite *ts, ByteIOContext *pb)
561 return av_rescale(url_ftell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
565 static uint8_t* write_pcr_bits(uint8_t *buf, int64_t pcr)
567 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
569 *buf++ = pcr_high >> 25;
570 *buf++ = pcr_high >> 17;
571 *buf++ = pcr_high >> 9;
572 *buf++ = pcr_high >> 1;
573 *buf++ = ((pcr_high & 1) << 7) | (pcr_low >> 8);
579 /* Write a single null transport stream packet */
580 static void mpegts_insert_null_packet(AVFormatContext *s)
582 MpegTSWrite *ts = s->priv_data;
584 uint8_t buf[TS_PACKET_SIZE];
591 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
592 put_buffer(s->pb, buf, TS_PACKET_SIZE);
595 /* Write a single transport stream packet with a PCR and no payload */
596 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
598 MpegTSWrite *ts = s->priv_data;
599 MpegTSWriteStream *ts_st = st->priv_data;
601 uint8_t buf[TS_PACKET_SIZE];
605 *q++ = ts_st->pid >> 8;
607 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
608 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
609 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
610 *q++ = 0x10; /* Adaptation flags: PCR present */
612 /* PCR coded into 6 bytes */
613 q = write_pcr_bits(q, get_pcr(ts, s->pb));
616 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
617 put_buffer(s->pb, buf, TS_PACKET_SIZE);
620 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
624 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
626 val = (((pts >> 15) & 0x7fff) << 1) | 1;
629 val = (((pts) & 0x7fff) << 1) | 1;
634 /* Add a pes header to the front of payload, and segment into an integer number of
635 * ts packets. The final ts packet is padded using an over-sized adaptation header
636 * to exactly fill the last ts packet.
637 * NOTE: 'payload' contains a complete PES payload.
639 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
640 const uint8_t *payload, int payload_size,
641 int64_t pts, int64_t dts)
643 MpegTSWriteStream *ts_st = st->priv_data;
644 MpegTSWrite *ts = s->priv_data;
645 uint8_t buf[TS_PACKET_SIZE];
647 int val, is_start, len, header_len, write_pcr, private_code, flags;
648 int afc_len, stuffing_len;
649 int64_t pcr = -1; /* avoid warning */
650 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
653 while (payload_size > 0) {
654 retransmit_si_info(s);
657 if (ts_st->pid == ts_st->service->pcr_pid) {
658 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
659 ts_st->service->pcr_packet_count++;
660 if (ts_st->service->pcr_packet_count >=
661 ts_st->service->pcr_packet_period) {
662 ts_st->service->pcr_packet_count = 0;
667 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
668 (dts - get_pcr(ts, s->pb)/300) > delay) {
669 /* pcr insert gets priority over null packet insert */
671 mpegts_insert_pcr_only(s, st);
673 mpegts_insert_null_packet(s);
674 continue; /* recalculate write_pcr and possibly retransmit si_info */
677 /* prepare packet header */
680 val = (ts_st->pid >> 8);
685 ts_st->cc = (ts_st->cc + 1) & 0xf;
686 *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
688 // add 11, pcr references the last byte of program clock reference base
689 if (ts->mux_rate > 1)
690 pcr = get_pcr(ts, s->pb);
692 pcr = (dts - delay)*300;
693 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
694 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
695 *q++ = 7; /* AFC length */
696 *q++ = 0x10; /* flags: PCR present */
697 q = write_pcr_bits(q, pcr);
700 int pes_extension = 0;
701 /* write PES header */
706 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
707 if (st->codec->codec_id == CODEC_ID_DIRAC) {
711 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
712 (st->codec->codec_id == CODEC_ID_MP2 ||
713 st->codec->codec_id == CODEC_ID_MP3)) {
717 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
723 if (pts != AV_NOPTS_VALUE) {
727 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
731 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
732 st->codec->codec_id == CODEC_ID_DIRAC) {
733 /* set PES_extension_flag */
738 * One byte for PES2 extension flag +
739 * one byte for extension length +
740 * one byte for extension id
744 len = payload_size + header_len + 3;
745 if (private_code != 0)
752 /* data alignment indicator is required for subtitle data */
753 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
758 if (pts != AV_NOPTS_VALUE) {
759 write_pts(q, flags >> 6, pts);
762 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
763 write_pts(q, 1, dts);
766 if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
767 flags = 0x01; /* set PES_extension_flag_2 */
769 *q++ = 0x80 | 0x01; /* marker bit + extension length */
771 * Set the stream id extension flag bit to 0 and
772 * write the extended stream id
776 if (private_code != 0)
781 header_len = q - buf;
783 len = TS_PACKET_SIZE - header_len;
784 if (len > payload_size)
786 stuffing_len = TS_PACKET_SIZE - header_len - len;
787 if (stuffing_len > 0) {
788 /* add stuffing with AFC */
790 /* stuffing already present: increase its size */
791 afc_len = buf[4] + 1;
792 memmove(buf + 4 + afc_len + stuffing_len,
794 header_len - (4 + afc_len));
795 buf[4] += stuffing_len;
796 memset(buf + 4 + afc_len, 0xff, stuffing_len);
799 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
801 buf[4] = stuffing_len - 1;
802 if (stuffing_len >= 2) {
804 memset(buf + 6, 0xff, stuffing_len - 2);
808 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
811 put_buffer(s->pb, buf, TS_PACKET_SIZE);
813 put_flush_packet(s->pb);
816 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
818 AVStream *st = s->streams[pkt->stream_index];
819 int size = pkt->size;
820 uint8_t *buf= pkt->data;
822 MpegTSWriteStream *ts_st = st->priv_data;
823 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
824 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
826 if (pkt->pts != AV_NOPTS_VALUE)
827 pts = pkt->pts + delay;
828 if (pkt->dts != AV_NOPTS_VALUE)
829 dts = pkt->dts + delay;
831 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
832 av_log(s, AV_LOG_ERROR, "first pts value must set\n");
835 ts_st->first_pts_check = 0;
837 if (st->codec->codec_id == CODEC_ID_H264) {
838 const uint8_t *p = buf, *buf_end = p+size;
841 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
842 av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, "
843 "no startcode found, use -vbsf h264_mp4toannexb\n");
848 p = ff_find_start_code(p, buf_end, &state);
849 //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);
850 } while (p < buf_end && (state & 0x1f) != 9 &&
851 (state & 0x1f) != 5 && (state & 0x1f) != 1);
853 if ((state & 0x1f) != 9) { // AUD NAL
854 data = av_malloc(pkt->size+6);
857 memcpy(data+6, pkt->data, pkt->size);
858 AV_WB32(data, 0x00000001);
860 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
864 } else if (st->codec->codec_id == CODEC_ID_AAC) {
867 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
868 ADTSContext *adts = ts_st->adts;
871 av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "
872 "and extradata missing\n");
875 new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;
876 if ((unsigned)new_size >= INT_MAX)
878 data = av_malloc(new_size);
880 return AVERROR(ENOMEM);
881 ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size);
882 if (adts->pce_size) {
883 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);
886 memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);
892 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
893 // for video and subtitle, write a single pes packet
894 mpegts_write_pes(s, st, buf, size, pts, dts);
899 if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {
900 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
901 ts_st->payload_pts, ts_st->payload_dts);
902 ts_st->payload_index = 0;
905 if (!ts_st->payload_index) {
906 ts_st->payload_pts = pts;
907 ts_st->payload_dts = dts;
910 memcpy(ts_st->payload + ts_st->payload_index, buf, size);
911 ts_st->payload_index += size;
918 static int mpegts_write_end(AVFormatContext *s)
920 MpegTSWrite *ts = s->priv_data;
921 MpegTSWriteStream *ts_st;
922 MpegTSService *service;
926 /* flush current packets */
927 for(i = 0; i < s->nb_streams; i++) {
929 ts_st = st->priv_data;
930 if (ts_st->payload_index > 0) {
931 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
932 ts_st->payload_pts, ts_st->payload_dts);
934 av_freep(&ts_st->adts);
936 put_flush_packet(s->pb);
938 for(i = 0; i < ts->nb_services; i++) {
939 service = ts->services[i];
940 av_freep(&service->provider_name);
941 av_freep(&service->name);
944 av_free(ts->services);
949 AVOutputFormat mpegts_muxer = {
951 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),