2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 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
24 //#define USE_SYNCPOINT_SEARCH
26 #include "libavutil/crc.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavcodec/bytestream.h"
32 #include "avio_internal.h"
37 /* maximum size in which we look for synchronisation if
38 synchronisation is lost */
39 #define MAX_RESYNC_SIZE 65536
41 #define MAX_PES_PAYLOAD 200*1024
43 enum MpegTSFilterType {
48 typedef struct MpegTSFilter MpegTSFilter;
50 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
52 typedef struct MpegTSPESFilter {
57 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
59 typedef void SetServiceCallback(void *opaque, int ret);
61 typedef struct MpegTSSectionFilter {
65 unsigned int check_crc:1;
66 unsigned int end_of_section_reached:1;
67 SectionCallback *section_cb;
69 } MpegTSSectionFilter;
73 int last_cc; /* last cc code (-1 if first packet) */
74 enum MpegTSFilterType type;
76 MpegTSPESFilter pes_filter;
77 MpegTSSectionFilter section_filter;
81 #define MAX_PIDS_PER_PROGRAM 64
83 unsigned int id; //program id/service id
85 unsigned int pids[MAX_PIDS_PER_PROGRAM];
88 struct MpegTSContext {
90 AVFormatContext *stream;
91 /** raw packet size, including FEC if present */
96 /** if true, all pids are analyzed to find streams */
99 /** compute exact PCR for each transport stream packet */
100 int mpeg2ts_compute_pcr;
102 int64_t cur_pcr; /**< used to estimate the exact PCR */
103 int pcr_incr; /**< used to estimate the exact PCR */
105 /* data needed to handle file based ts */
106 /** stop parsing loop */
108 /** packet containing Audio/Video data */
110 /** to detect seek */
113 /******************************************/
114 /* private mpegts data */
116 /** structure to keep track of Program->pids mapping */
121 /** filters for various streams specified by PMT + for the PAT and PMT */
122 MpegTSFilter *pids[NB_PID_MAX];
125 /* TS stream handling */
130 MPEGTS_PESHEADER_FILL,
135 /* enough for PES header + length */
136 #define PES_START_SIZE 6
137 #define PES_HEADER_SIZE 9
138 #define MAX_PES_HEADER_SIZE (9 + 255)
140 typedef struct PESContext {
142 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
145 AVFormatContext *stream;
147 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
148 enum MpegTSState state;
149 /* used to get the format */
153 int extended_stream_id;
155 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
156 uint8_t header[MAX_PES_HEADER_SIZE];
160 extern AVInputFormat ff_mpegts_demuxer;
162 static void clear_program(MpegTSContext *ts, unsigned int programid)
166 for(i=0; i<ts->nb_prg; i++)
167 if(ts->prg[i].id == programid)
168 ts->prg[i].nb_pids = 0;
171 static void clear_programs(MpegTSContext *ts)
177 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
180 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
184 p = &ts->prg[ts->nb_prg];
190 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
193 struct Program *p = NULL;
194 for(i=0; i<ts->nb_prg; i++) {
195 if(ts->prg[i].id == programid) {
203 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
205 p->pids[p->nb_pids++] = pid;
209 * \brief discard_pid() decides if the pid is to be discarded according
210 * to caller's programs selection
211 * \param ts : - TS context
213 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
216 static int discard_pid(MpegTSContext *ts, unsigned int pid)
219 int used = 0, discarded = 0;
221 for(i=0; i<ts->nb_prg; i++) {
223 for(j=0; j<p->nb_pids; j++) {
224 if(p->pids[j] != pid)
226 //is program with id p->id set to be discarded?
227 for(k=0; k<ts->stream->nb_programs; k++) {
228 if(ts->stream->programs[k]->id == p->id) {
229 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
238 return !used && discarded;
242 * Assemble PES packets out of TS packets, and then call the "section_cb"
243 * function when they are complete.
245 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
246 const uint8_t *buf, int buf_size, int is_start)
248 MpegTSSectionFilter *tss = &tss1->u.section_filter;
252 memcpy(tss->section_buf, buf, buf_size);
253 tss->section_index = buf_size;
254 tss->section_h_size = -1;
255 tss->end_of_section_reached = 0;
257 if (tss->end_of_section_reached)
259 len = 4096 - tss->section_index;
262 memcpy(tss->section_buf + tss->section_index, buf, len);
263 tss->section_index += len;
266 /* compute section length if possible */
267 if (tss->section_h_size == -1 && tss->section_index >= 3) {
268 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
271 tss->section_h_size = len;
274 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
275 tss->end_of_section_reached = 1;
276 if (!tss->check_crc ||
277 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
278 tss->section_buf, tss->section_h_size) == 0)
279 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
283 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
284 SectionCallback *section_cb, void *opaque,
288 MpegTSFilter *filter;
289 MpegTSSectionFilter *sec;
291 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
293 if (pid >= NB_PID_MAX || ts->pids[pid])
295 filter = av_mallocz(sizeof(MpegTSFilter));
298 ts->pids[pid] = filter;
299 filter->type = MPEGTS_SECTION;
301 filter->last_cc = -1;
302 sec = &filter->u.section_filter;
303 sec->section_cb = section_cb;
304 sec->opaque = opaque;
305 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
306 sec->check_crc = check_crc;
307 if (!sec->section_buf) {
314 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
318 MpegTSFilter *filter;
319 MpegTSPESFilter *pes;
321 if (pid >= NB_PID_MAX || ts->pids[pid])
323 filter = av_mallocz(sizeof(MpegTSFilter));
326 ts->pids[pid] = filter;
327 filter->type = MPEGTS_PES;
329 filter->last_cc = -1;
330 pes = &filter->u.pes_filter;
331 pes->pes_cb = pes_cb;
332 pes->opaque = opaque;
336 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
341 if (filter->type == MPEGTS_SECTION)
342 av_freep(&filter->u.section_filter.section_buf);
343 else if (filter->type == MPEGTS_PES) {
344 PESContext *pes = filter->u.pes_filter.opaque;
345 av_freep(&pes->buffer);
346 /* referenced private data will be freed later in
347 * av_close_input_stream */
348 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
349 av_freep(&filter->u.pes_filter.opaque);
354 ts->pids[pid] = NULL;
357 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
358 int stat[TS_MAX_PACKET_SIZE];
363 memset(stat, 0, packet_size*sizeof(int));
365 for(x=i=0; i<size-3; i++){
366 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
368 if(stat[x] > best_score){
375 if(x == packet_size) x= 0;
381 /* autodetect fec presence. Must have at least 1024 bytes */
382 static int get_packet_size(const uint8_t *buf, int size)
384 int score, fec_score, dvhs_score;
386 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
389 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
390 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
391 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
392 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
394 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
395 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
396 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
400 typedef struct SectionHeader {
405 uint8_t last_sec_num;
408 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
421 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
427 if ((p + 1) >= p_end)
435 /* read and allocate a DVB string preceeded by its length */
436 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
443 len = get8(&p, p_end);
446 if ((p + len) > p_end)
448 str = av_malloc(len + 1);
458 static int parse_section_header(SectionHeader *h,
459 const uint8_t **pp, const uint8_t *p_end)
463 val = get8(pp, p_end);
468 val = get16(pp, p_end);
472 val = get8(pp, p_end);
475 h->version = (val >> 1) & 0x1f;
476 val = get8(pp, p_end);
480 val = get8(pp, p_end);
483 h->last_sec_num = val;
488 uint32_t stream_type;
489 enum AVMediaType codec_type;
490 enum CodecID codec_id;
493 static const StreamType ISO_types[] = {
494 { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
495 { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
496 { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
497 { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
498 { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
499 { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
500 { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
501 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
502 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
503 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
507 static const StreamType HDMV_types[] = {
508 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
509 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
510 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
511 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
512 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
513 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
518 static const StreamType MISC_types[] = {
519 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
520 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
524 static const StreamType REGD_types[] = {
525 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
526 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
527 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
531 /* descriptor present */
532 static const StreamType DESC_types[] = {
533 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
534 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
535 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
536 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
537 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
541 static void mpegts_find_stream_type(AVStream *st,
542 uint32_t stream_type, const StreamType *types)
544 for (; types->stream_type; types++) {
545 if (stream_type == types->stream_type) {
546 st->codec->codec_type = types->codec_type;
547 st->codec->codec_id = types->codec_id;
548 st->request_probe = 0;
554 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
555 uint32_t stream_type, uint32_t prog_reg_desc)
557 av_set_pts_info(st, 33, 1, 90000);
559 st->codec->codec_type = AVMEDIA_TYPE_DATA;
560 st->codec->codec_id = CODEC_ID_NONE;
561 st->need_parsing = AVSTREAM_PARSE_FULL;
563 pes->stream_type = stream_type;
565 av_log(pes->stream, AV_LOG_DEBUG,
566 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
567 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
569 st->codec->codec_tag = pes->stream_type;
571 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
572 if (prog_reg_desc == AV_RL32("HDMV") &&
573 st->codec->codec_id == CODEC_ID_NONE) {
574 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
575 if (pes->stream_type == 0x83) {
576 // HDMV TrueHD streams also contain an AC3 coded version of the
577 // audio track - add a second stream for this
579 // priv_data cannot be shared between streams
580 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
582 return AVERROR(ENOMEM);
583 memcpy(sub_pes, pes, sizeof(*sub_pes));
585 sub_st = av_new_stream(pes->stream, pes->pid);
588 return AVERROR(ENOMEM);
591 av_set_pts_info(sub_st, 33, 1, 90000);
592 sub_st->priv_data = sub_pes;
593 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
594 sub_st->codec->codec_id = CODEC_ID_AC3;
595 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
596 sub_pes->sub_st = pes->sub_st = sub_st;
599 if (st->codec->codec_id == CODEC_ID_NONE)
600 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
605 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
609 pkt->destruct = av_destruct_packet;
610 pkt->data = pes->buffer;
611 pkt->size = pes->data_index;
612 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
614 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
615 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
616 pkt->stream_index = pes->sub_st->index;
618 pkt->stream_index = pes->st->index;
621 /* store position of first TS packet of this PES packet */
622 pkt->pos = pes->ts_packet_pos;
624 /* reset pts values */
625 pes->pts = AV_NOPTS_VALUE;
626 pes->dts = AV_NOPTS_VALUE;
631 /* return non zero if a packet could be constructed */
632 static int mpegts_push_data(MpegTSFilter *filter,
633 const uint8_t *buf, int buf_size, int is_start,
636 PESContext *pes = filter->u.pes_filter.opaque;
637 MpegTSContext *ts = pes->ts;
645 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
646 new_pes_packet(pes, ts->pkt);
649 pes->state = MPEGTS_HEADER;
651 pes->ts_packet_pos = pos;
654 while (buf_size > 0) {
657 len = PES_START_SIZE - pes->data_index;
660 memcpy(pes->header + pes->data_index, p, len);
661 pes->data_index += len;
664 if (pes->data_index == PES_START_SIZE) {
665 /* we got all the PES or section header. We can now
667 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
668 pes->header[2] == 0x01) {
669 /* it must be an mpeg2 PES stream */
670 code = pes->header[3] | 0x100;
671 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
673 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
674 code == 0x1be) /* padding_stream */
677 /* stream not present in PMT */
679 pes->st = av_new_stream(ts->stream, pes->pid);
681 return AVERROR(ENOMEM);
682 mpegts_set_stream_info(pes->st, pes, 0, 0);
685 pes->total_size = AV_RB16(pes->header + 4);
686 /* NOTE: a zero total size means the PES size is
688 if (!pes->total_size)
689 pes->total_size = MAX_PES_PAYLOAD;
691 /* allocate pes buffer */
692 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
694 return AVERROR(ENOMEM);
696 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
697 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
698 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
699 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
700 pes->state = MPEGTS_PESHEADER;
701 if (pes->st->codec->codec_id == CODEC_ID_NONE && !pes->st->request_probe) {
702 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
703 pes->pid, pes->stream_type);
704 pes->st->request_probe= 1;
707 pes->state = MPEGTS_PAYLOAD;
711 /* otherwise, it should be a table */
714 pes->state = MPEGTS_SKIP;
719 /**********************************************/
720 /* PES packing parsing */
721 case MPEGTS_PESHEADER:
722 len = PES_HEADER_SIZE - pes->data_index;
727 memcpy(pes->header + pes->data_index, p, len);
728 pes->data_index += len;
731 if (pes->data_index == PES_HEADER_SIZE) {
732 pes->pes_header_size = pes->header[8] + 9;
733 pes->state = MPEGTS_PESHEADER_FILL;
736 case MPEGTS_PESHEADER_FILL:
737 len = pes->pes_header_size - pes->data_index;
742 memcpy(pes->header + pes->data_index, p, len);
743 pes->data_index += len;
746 if (pes->data_index == pes->pes_header_size) {
748 unsigned int flags, pes_ext, skip;
750 flags = pes->header[7];
752 pes->pts = AV_NOPTS_VALUE;
753 pes->dts = AV_NOPTS_VALUE;
754 if ((flags & 0xc0) == 0x80) {
755 pes->dts = pes->pts = ff_parse_pes_pts(r);
757 } else if ((flags & 0xc0) == 0xc0) {
758 pes->pts = ff_parse_pes_pts(r);
760 pes->dts = ff_parse_pes_pts(r);
763 pes->extended_stream_id = -1;
764 if (flags & 0x01) { /* PES extension */
766 /* Skip PES private data, program packet sequence counter and P-STD buffer */
767 skip = (pes_ext >> 4) & 0xb;
770 if ((pes_ext & 0x41) == 0x01 &&
771 (r + 2) <= (pes->header + pes->pes_header_size)) {
772 /* PES extension 2 */
773 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
774 pes->extended_stream_id = r[1];
778 /* we got the full header. We parse it and get the payload */
779 pes->state = MPEGTS_PAYLOAD;
784 if (buf_size > 0 && pes->buffer) {
785 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
786 new_pes_packet(pes, ts->pkt);
787 pes->total_size = MAX_PES_PAYLOAD;
788 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
790 return AVERROR(ENOMEM);
792 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
793 // pes packet size is < ts size packet and pes data is padded with 0xff
794 // not sure if this is legal in ts but see issue #2392
795 buf_size = pes->total_size;
797 memcpy(pes->buffer+pes->data_index, p, buf_size);
798 pes->data_index += buf_size;
801 /* emit complete packets with known packet size
802 * decreases demuxer delay for infrequent packets like subtitles from
803 * a couple of seconds to milliseconds for properly muxed files.
804 * total_size is the number of bytes following pes_packet_length
805 * in the pes header, i.e. not counting the first 6 bytes */
806 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
807 pes->pes_header_size + pes->data_index == pes->total_size + 6) {
809 new_pes_packet(pes, ts->pkt);
821 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
826 /* if no pid found, then add a pid context */
827 pes = av_mallocz(sizeof(PESContext));
831 pes->stream = ts->stream;
833 pes->pcr_pid = pcr_pid;
834 pes->state = MPEGTS_SKIP;
835 pes->pts = AV_NOPTS_VALUE;
836 pes->dts = AV_NOPTS_VALUE;
837 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
845 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
846 int *es_id, uint8_t **dec_config_descr,
847 int *dec_config_descr_size)
853 ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
855 len = ff_mp4_read_descr(s, &pb, &tag);
856 if (tag == MP4IODescrTag) {
857 avio_rb16(&pb); // ID
863 len = ff_mp4_read_descr(s, &pb, &tag);
864 if (tag == MP4ESDescrTag) {
865 *es_id = avio_rb16(&pb); /* ES_ID */
866 av_dlog(s, "ES_ID %#x\n", *es_id);
867 avio_r8(&pb); /* priority */
868 len = ff_mp4_read_descr(s, &pb, &tag);
869 if (tag == MP4DecConfigDescrTag) {
870 *dec_config_descr = av_malloc(len);
871 if (!*dec_config_descr)
872 return AVERROR(ENOMEM);
873 *dec_config_descr_size = len;
874 avio_read(&pb, *dec_config_descr, len);
881 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
882 const uint8_t **pp, const uint8_t *desc_list_end,
883 int mp4_dec_config_descr_len, int mp4_es_id, int pid,
884 uint8_t *mp4_dec_config_descr)
886 const uint8_t *desc_end;
887 int desc_len, desc_tag;
891 desc_tag = get8(pp, desc_list_end);
894 desc_len = get8(pp, desc_list_end);
897 desc_end = *pp + desc_len;
898 if (desc_end > desc_list_end)
901 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
903 if (st->codec->codec_id == CODEC_ID_NONE &&
904 stream_type == STREAM_TYPE_PRIVATE_DATA)
905 mpegts_find_stream_type(st, desc_tag, DESC_types);
908 case 0x1F: /* FMC descriptor */
910 if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
911 mp4_dec_config_descr_len && mp4_es_id == pid) {
913 ffio_init_context(&pb, mp4_dec_config_descr,
914 mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
915 ff_mp4_read_dec_config_descr(fc, st, &pb);
916 if (st->codec->codec_id == CODEC_ID_AAC &&
917 st->codec->extradata_size > 0)
918 st->need_parsing = 0;
921 case 0x56: /* DVB teletext descriptor */
922 language[0] = get8(pp, desc_end);
923 language[1] = get8(pp, desc_end);
924 language[2] = get8(pp, desc_end);
926 av_metadata_set2(&st->metadata, "language", language, 0);
928 case 0x59: /* subtitling descriptor */
929 language[0] = get8(pp, desc_end);
930 language[1] = get8(pp, desc_end);
931 language[2] = get8(pp, desc_end);
933 /* hearing impaired subtitles detection */
934 switch(get8(pp, desc_end)) {
935 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
936 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
937 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
938 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
939 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
940 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
941 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
944 if (st->codec->extradata) {
945 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
946 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
948 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
949 if (st->codec->extradata) {
950 st->codec->extradata_size = 4;
951 memcpy(st->codec->extradata, *pp, 4);
955 av_metadata_set2(&st->metadata, "language", language, 0);
957 case 0x0a: /* ISO 639 language descriptor */
958 for (i = 0; i + 4 <= desc_len; i += 4) {
959 language[i + 0] = get8(pp, desc_end);
960 language[i + 1] = get8(pp, desc_end);
961 language[i + 2] = get8(pp, desc_end);
962 language[i + 3] = ',';
963 switch (get8(pp, desc_end)) {
964 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
965 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
966 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
971 av_metadata_set2(&st->metadata, "language", language, 0);
974 case 0x05: /* registration descriptor */
975 st->codec->codec_tag = bytestream_get_le32(pp);
976 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
977 if (st->codec->codec_id == CODEC_ID_NONE &&
978 stream_type == STREAM_TYPE_PRIVATE_DATA)
979 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
988 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
990 MpegTSContext *ts = filter->u.section_filter.opaque;
991 SectionHeader h1, *h = &h1;
994 const uint8_t *p, *p_end, *desc_list_end;
995 int program_info_length, pcr_pid, pid, stream_type;
997 uint32_t prog_reg_desc = 0; /* registration descriptor */
998 uint8_t *mp4_dec_config_descr = NULL;
999 int mp4_dec_config_descr_len = 0;
1003 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1004 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1007 p_end = section + section_len - 4;
1009 if (parse_section_header(h, &p, p_end) < 0)
1012 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1013 h->id, h->sec_num, h->last_sec_num);
1015 if (h->tid != PMT_TID)
1018 clear_program(ts, h->id);
1019 pcr_pid = get16(&p, p_end) & 0x1fff;
1022 add_pid_to_pmt(ts, h->id, pcr_pid);
1024 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1026 program_info_length = get16(&p, p_end) & 0xfff;
1027 if (program_info_length < 0)
1029 while(program_info_length >= 2) {
1031 tag = get8(&p, p_end);
1032 len = get8(&p, p_end);
1034 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1036 if(len > program_info_length - 2)
1037 //something else is broken, exit the program_descriptors_loop
1039 program_info_length -= len + 2;
1040 if (tag == 0x1d) { // IOD descriptor
1041 get8(&p, p_end); // scope
1042 get8(&p, p_end); // label
1044 mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1045 &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1046 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1047 prog_reg_desc = bytestream_get_le32(&p);
1052 p += program_info_length;
1056 // stop parsing after pmt, we found header
1057 if (!ts->stream->nb_streams)
1062 stream_type = get8(&p, p_end);
1063 if (stream_type < 0)
1065 pid = get16(&p, p_end) & 0x1fff;
1069 /* now create ffmpeg stream */
1070 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1071 pes = ts->pids[pid]->u.pes_filter.opaque;
1073 pes->st = av_new_stream(pes->stream, pes->pid);
1076 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1077 pes = add_pes_stream(ts, pid, pcr_pid);
1079 st = av_new_stream(pes->stream, pes->pid);
1085 if (!pes->stream_type)
1086 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1088 add_pid_to_pmt(ts, h->id, pid);
1090 ff_program_add_stream_index(ts->stream, h->id, st->index);
1092 desc_list_len = get16(&p, p_end) & 0xfff;
1093 if (desc_list_len < 0)
1095 desc_list_end = p + desc_list_len;
1096 if (desc_list_end > p_end)
1099 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1100 mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1103 if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1104 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1105 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1112 av_free(mp4_dec_config_descr);
1115 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1117 MpegTSContext *ts = filter->u.section_filter.opaque;
1118 SectionHeader h1, *h = &h1;
1119 const uint8_t *p, *p_end;
1123 av_dlog(ts->stream, "PAT:\n");
1124 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1126 p_end = section + section_len - 4;
1128 if (parse_section_header(h, &p, p_end) < 0)
1130 if (h->tid != PAT_TID)
1135 sid = get16(&p, p_end);
1138 pmt_pid = get16(&p, p_end) & 0x1fff;
1142 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1144 if (sid == 0x0000) {
1147 av_new_program(ts->stream, sid);
1148 if (ts->pids[pmt_pid])
1149 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1150 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1151 add_pat_entry(ts, sid);
1152 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1153 add_pid_to_pmt(ts, sid, pmt_pid);
1158 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1160 MpegTSContext *ts = filter->u.section_filter.opaque;
1161 SectionHeader h1, *h = &h1;
1162 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1163 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1164 char *name, *provider_name;
1167 av_dlog(ts->stream, "SDT:\n");
1168 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1171 p_end = section + section_len - 4;
1173 if (parse_section_header(h, &p, p_end) < 0)
1175 if (h->tid != SDT_TID)
1177 onid = get16(&p, p_end);
1180 val = get8(&p, p_end);
1184 sid = get16(&p, p_end);
1187 val = get8(&p, p_end);
1190 desc_list_len = get16(&p, p_end) & 0xfff;
1191 if (desc_list_len < 0)
1193 desc_list_end = p + desc_list_len;
1194 if (desc_list_end > p_end)
1197 desc_tag = get8(&p, desc_list_end);
1200 desc_len = get8(&p, desc_list_end);
1201 desc_end = p + desc_len;
1202 if (desc_end > desc_list_end)
1205 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1206 desc_tag, desc_len);
1210 service_type = get8(&p, p_end);
1211 if (service_type < 0)
1213 provider_name = getstr8(&p, p_end);
1216 name = getstr8(&p, p_end);
1218 AVProgram *program = av_new_program(ts->stream, sid);
1220 av_metadata_set2(&program->metadata, "service_name", name, 0);
1221 av_metadata_set2(&program->metadata, "service_provider", provider_name, 0);
1225 av_free(provider_name);
1236 /* handle one TS packet */
1237 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1239 AVFormatContext *s = ts->stream;
1241 int len, pid, cc, cc_ok, afc, is_start;
1242 const uint8_t *p, *p_end;
1245 pid = AV_RB16(packet + 1) & 0x1fff;
1246 if(pid && discard_pid(ts, pid))
1248 is_start = packet[1] & 0x40;
1249 tss = ts->pids[pid];
1250 if (ts->auto_guess && tss == NULL && is_start) {
1251 add_pes_stream(ts, pid, -1);
1252 tss = ts->pids[pid];
1257 /* continuity check (currently not used) */
1258 cc = (packet[3] & 0xf);
1259 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1262 /* skip adaptation field */
1263 afc = (packet[3] >> 4) & 3;
1265 if (afc == 0) /* reserved value */
1267 if (afc == 2) /* adaptation field only */
1270 /* skip adapation field */
1273 /* if past the end of packet, ignore */
1274 p_end = packet + TS_PACKET_SIZE;
1278 pos = avio_tell(ts->stream->pb);
1279 ts->pos47= pos % ts->raw_packet_size;
1281 if (tss->type == MPEGTS_SECTION) {
1283 /* pointer field present */
1285 if (p + len > p_end)
1288 /* write remaining section bytes */
1289 write_section_data(s, tss,
1291 /* check whether filter has been closed */
1297 write_section_data(s, tss,
1302 write_section_data(s, tss,
1308 // Note: The position here points actually behind the current packet.
1309 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1310 pos - ts->raw_packet_size)) < 0)
1317 /* XXX: try to find a better synchro over several packets (use
1318 get_packet_size() ?) */
1319 static int mpegts_resync(AVFormatContext *s)
1321 AVIOContext *pb = s->pb;
1324 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1329 avio_seek(pb, -1, SEEK_CUR);
1333 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1338 /* return -1 if error or EOF. Return 0 if OK. */
1339 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1341 AVIOContext *pb = s->pb;
1345 len = avio_read(pb, buf, TS_PACKET_SIZE);
1346 if (len != TS_PACKET_SIZE)
1347 return len < 0 ? len : AVERROR_EOF;
1348 /* check paquet sync byte */
1349 if (buf[0] != 0x47) {
1350 /* find a new packet start */
1351 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1352 if (mpegts_resync(s) < 0)
1353 return AVERROR(EAGAIN);
1357 skip = raw_packet_size - TS_PACKET_SIZE;
1359 avio_skip(pb, skip);
1366 static int handle_packets(MpegTSContext *ts, int nb_packets)
1368 AVFormatContext *s = ts->stream;
1369 uint8_t packet[TS_PACKET_SIZE];
1370 int packet_num, ret;
1375 if (ts->stop_parse>0)
1378 if (nb_packets != 0 && packet_num >= nb_packets)
1380 ret = read_packet(s, packet, ts->raw_packet_size);
1383 ret = handle_packet(ts, packet);
1390 static int mpegts_probe(AVProbeData *p)
1393 const int size= p->buf_size;
1394 int score, fec_score, dvhs_score;
1395 int check_count= size / TS_FEC_PACKET_SIZE;
1396 #define CHECK_COUNT 10
1398 if (check_count < CHECK_COUNT)
1401 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1402 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1403 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1404 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1406 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1407 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1408 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1409 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1412 /* only use the extension for safer guess */
1413 if (av_match_ext(p->filename, "ts"))
1414 return AVPROBE_SCORE_MAX;
1420 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1421 (-1) if not available */
1422 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1423 const uint8_t *packet)
1425 int afc, len, flags;
1429 afc = (packet[3] >> 4) & 3;
1439 if (!(flags & 0x10))
1444 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1445 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1449 static int mpegts_read_header(AVFormatContext *s,
1450 AVFormatParameters *ap)
1452 MpegTSContext *ts = s->priv_data;
1453 AVIOContext *pb = s->pb;
1454 uint8_t buf[8*1024];
1459 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1460 if(ap->mpeg2ts_raw){
1461 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1466 /* read the first 1024 bytes to get packet size */
1467 pos = avio_tell(pb);
1468 len = avio_read(pb, buf, sizeof(buf));
1469 if (len != sizeof(buf))
1471 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1472 if (ts->raw_packet_size <= 0) {
1473 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1474 ts->raw_packet_size = TS_PACKET_SIZE;
1479 if (s->iformat == &ff_mpegts_demuxer) {
1482 /* first do a scaning to get all the services */
1483 if (avio_seek(pb, pos, SEEK_SET) < 0)
1484 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1486 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1488 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1490 handle_packets(ts, s->probesize / ts->raw_packet_size);
1491 /* if could not find service, enable auto_guess */
1495 av_dlog(ts->stream, "tuning done\n");
1497 s->ctx_flags |= AVFMTCTX_NOHEADER;
1500 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1501 int64_t pcrs[2], pcr_h;
1502 int packet_count[2];
1503 uint8_t packet[TS_PACKET_SIZE];
1505 /* only read packets */
1507 st = av_new_stream(s, 0);
1510 av_set_pts_info(st, 60, 1, 27000000);
1511 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1512 st->codec->codec_id = CODEC_ID_MPEG2TS;
1514 /* we iterate until we find two PCRs to estimate the bitrate */
1519 ret = read_packet(s, packet, ts->raw_packet_size);
1522 pid = AV_RB16(packet + 1) & 0x1fff;
1523 if ((pcr_pid == -1 || pcr_pid == pid) &&
1524 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1526 packet_count[nb_pcrs] = nb_packets;
1527 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1535 /* NOTE1: the bitrate is computed without the FEC */
1536 /* NOTE2: it is only the bitrate of the start of the stream */
1537 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1538 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1539 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1540 st->codec->bit_rate = s->bit_rate;
1541 st->start_time = ts->cur_pcr;
1543 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1544 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1548 avio_seek(pb, pos, SEEK_SET);
1554 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1556 static int mpegts_raw_read_packet(AVFormatContext *s,
1559 MpegTSContext *ts = s->priv_data;
1561 int64_t pcr_h, next_pcr_h, pos;
1562 int pcr_l, next_pcr_l;
1563 uint8_t pcr_buf[12];
1565 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1566 return AVERROR(ENOMEM);
1567 pkt->pos= avio_tell(s->pb);
1568 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1570 av_free_packet(pkt);
1573 if (ts->mpeg2ts_compute_pcr) {
1574 /* compute exact PCR for each packet */
1575 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1576 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1577 pos = avio_tell(s->pb);
1578 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1579 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1580 avio_read(s->pb, pcr_buf, 12);
1581 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1582 /* XXX: not precise enough */
1583 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1588 avio_seek(s->pb, pos, SEEK_SET);
1589 /* no next PCR found: we use previous increment */
1590 ts->cur_pcr = pcr_h * 300 + pcr_l;
1592 pkt->pts = ts->cur_pcr;
1593 pkt->duration = ts->pcr_incr;
1594 ts->cur_pcr += ts->pcr_incr;
1596 pkt->stream_index = 0;
1600 static int mpegts_read_packet(AVFormatContext *s,
1603 MpegTSContext *ts = s->priv_data;
1606 if (avio_tell(s->pb) != ts->last_pos) {
1607 /* seek detected, flush pes buffer */
1608 for (i = 0; i < NB_PID_MAX; i++) {
1609 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1610 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1611 av_freep(&pes->buffer);
1612 pes->data_index = 0;
1613 pes->state = MPEGTS_SKIP; /* skip until pes header */
1619 ret = handle_packets(ts, 0);
1621 /* flush pes data left */
1622 for (i = 0; i < NB_PID_MAX; i++) {
1623 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1624 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1625 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1626 new_pes_packet(pes, pkt);
1627 pes->state = MPEGTS_SKIP;
1635 ts->last_pos = avio_tell(s->pb);
1640 static int mpegts_read_close(AVFormatContext *s)
1642 MpegTSContext *ts = s->priv_data;
1647 for(i=0;i<NB_PID_MAX;i++)
1648 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1653 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1654 int64_t *ppos, int64_t pos_limit)
1656 MpegTSContext *ts = s->priv_data;
1657 int64_t pos, timestamp;
1658 uint8_t buf[TS_PACKET_SIZE];
1659 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1660 const int find_next= 1;
1661 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1664 avio_seek(s->pb, pos, SEEK_SET);
1665 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1666 return AV_NOPTS_VALUE;
1667 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1668 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1671 pos += ts->raw_packet_size;
1675 pos -= ts->raw_packet_size;
1677 return AV_NOPTS_VALUE;
1678 avio_seek(s->pb, pos, SEEK_SET);
1679 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1680 return AV_NOPTS_VALUE;
1681 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1682 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1692 #ifdef USE_SYNCPOINT_SEARCH
1694 static int read_seek2(AVFormatContext *s,
1703 int64_t ts_ret, ts_adj;
1704 int stream_index_gen_search;
1706 AVParserState *backup;
1708 backup = ff_store_parser_state(s);
1710 // detect direction of seeking for search purposes
1711 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1712 AVSEEK_FLAG_BACKWARD : 0;
1714 if (flags & AVSEEK_FLAG_BYTE) {
1715 // use position directly, we will search starting from it
1718 // search for some position with good timestamp match
1719 if (stream_index < 0) {
1720 stream_index_gen_search = av_find_default_stream_index(s);
1721 if (stream_index_gen_search < 0) {
1722 ff_restore_parser_state(s, backup);
1726 st = s->streams[stream_index_gen_search];
1727 // timestamp for default must be expressed in AV_TIME_BASE units
1728 ts_adj = av_rescale(target_ts,
1730 AV_TIME_BASE * (int64_t)st->time_base.num);
1733 stream_index_gen_search = stream_index;
1735 pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1739 flags, &ts_ret, mpegts_get_pcr);
1741 ff_restore_parser_state(s, backup);
1746 // search for actual matching keyframe/starting position for all streams
1747 if (ff_gen_syncpoint_search(s, stream_index, pos,
1748 min_ts, target_ts, max_ts,
1750 ff_restore_parser_state(s, backup);
1754 ff_free_parser_state(s, backup);
1758 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1761 if (flags & AVSEEK_FLAG_BACKWARD) {
1762 flags &= ~AVSEEK_FLAG_BACKWARD;
1763 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1765 // for compatibility reasons, seek to the best-fitting timestamp
1766 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1768 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1770 // for compatibility reasons, seek to the best-fitting timestamp
1771 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1778 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1779 MpegTSContext *ts = s->priv_data;
1780 uint8_t buf[TS_PACKET_SIZE];
1783 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1786 pos= avio_tell(s->pb);
1789 avio_seek(s->pb, pos, SEEK_SET);
1790 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1792 // pid = AV_RB16(buf + 1) & 0x1fff;
1793 if(buf[1] & 0x40) break;
1794 pos += ts->raw_packet_size;
1796 avio_seek(s->pb, pos, SEEK_SET);
1803 /**************************************************************/
1804 /* parsing functions - called from other demuxers such as RTP */
1806 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1810 ts = av_mallocz(sizeof(MpegTSContext));
1813 /* no stream case, currently used by RTP */
1814 ts->raw_packet_size = TS_PACKET_SIZE;
1820 /* return the consumed length if a packet was output, or -1 if no
1822 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1823 const uint8_t *buf, int len)
1831 if (ts->stop_parse>0)
1833 if (len < TS_PACKET_SIZE)
1835 if (buf[0] != 0x47) {
1839 handle_packet(ts, buf);
1840 buf += TS_PACKET_SIZE;
1841 len -= TS_PACKET_SIZE;
1847 void ff_mpegts_parse_close(MpegTSContext *ts)
1851 for(i=0;i<NB_PID_MAX;i++)
1852 av_free(ts->pids[i]);
1856 AVInputFormat ff_mpegts_demuxer = {
1858 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1859 sizeof(MpegTSContext),
1866 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1867 #ifdef USE_SYNCPOINT_SEARCH
1868 .read_seek2 = read_seek2,
1872 AVInputFormat ff_mpegtsraw_demuxer = {
1874 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1875 sizeof(MpegTSContext),
1878 mpegts_raw_read_packet,
1882 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1883 #ifdef USE_SYNCPOINT_SEARCH
1884 .read_seek2 = read_seek2,