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 },
530 /* descriptor present */
531 static const StreamType DESC_types[] = {
532 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
533 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
534 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
535 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
536 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
540 static void mpegts_find_stream_type(AVStream *st,
541 uint32_t stream_type, const StreamType *types)
543 for (; types->stream_type; types++) {
544 if (stream_type == types->stream_type) {
545 st->codec->codec_type = types->codec_type;
546 st->codec->codec_id = types->codec_id;
552 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
553 uint32_t stream_type, uint32_t prog_reg_desc)
555 av_set_pts_info(st, 33, 1, 90000);
557 st->codec->codec_type = AVMEDIA_TYPE_DATA;
558 st->codec->codec_id = CODEC_ID_NONE;
559 st->need_parsing = AVSTREAM_PARSE_FULL;
561 pes->stream_type = stream_type;
563 av_log(pes->stream, AV_LOG_DEBUG,
564 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
565 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
567 st->codec->codec_tag = pes->stream_type;
569 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
570 if (prog_reg_desc == AV_RL32("HDMV") &&
571 st->codec->codec_id == CODEC_ID_NONE) {
572 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
573 if (pes->stream_type == 0x83) {
574 // HDMV TrueHD streams also contain an AC3 coded version of the
575 // audio track - add a second stream for this
577 // priv_data cannot be shared between streams
578 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
580 return AVERROR(ENOMEM);
581 memcpy(sub_pes, pes, sizeof(*sub_pes));
583 sub_st = av_new_stream(pes->stream, pes->pid);
586 return AVERROR(ENOMEM);
589 av_set_pts_info(sub_st, 33, 1, 90000);
590 sub_st->priv_data = sub_pes;
591 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
592 sub_st->codec->codec_id = CODEC_ID_AC3;
593 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
594 sub_pes->sub_st = pes->sub_st = sub_st;
597 if (st->codec->codec_id == CODEC_ID_NONE)
598 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
603 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
607 pkt->destruct = av_destruct_packet;
608 pkt->data = pes->buffer;
609 pkt->size = pes->data_index;
610 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
612 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
613 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
614 pkt->stream_index = pes->sub_st->index;
616 pkt->stream_index = pes->st->index;
619 /* store position of first TS packet of this PES packet */
620 pkt->pos = pes->ts_packet_pos;
622 /* reset pts values */
623 pes->pts = AV_NOPTS_VALUE;
624 pes->dts = AV_NOPTS_VALUE;
629 /* return non zero if a packet could be constructed */
630 static int mpegts_push_data(MpegTSFilter *filter,
631 const uint8_t *buf, int buf_size, int is_start,
634 PESContext *pes = filter->u.pes_filter.opaque;
635 MpegTSContext *ts = pes->ts;
643 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
644 new_pes_packet(pes, ts->pkt);
647 pes->state = MPEGTS_HEADER;
649 pes->ts_packet_pos = pos;
652 while (buf_size > 0) {
655 len = PES_START_SIZE - pes->data_index;
658 memcpy(pes->header + pes->data_index, p, len);
659 pes->data_index += len;
662 if (pes->data_index == PES_START_SIZE) {
663 /* we got all the PES or section header. We can now
666 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
668 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
669 pes->header[2] == 0x01) {
670 /* it must be an mpeg2 PES stream */
671 code = pes->header[3] | 0x100;
672 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
674 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
675 code == 0x1be) /* padding_stream */
678 #if FF_API_MAX_STREAMS
679 if (!pes->st && pes->stream->nb_streams == MAX_STREAMS)
683 /* stream not present in PMT */
685 pes->st = av_new_stream(ts->stream, pes->pid);
687 return AVERROR(ENOMEM);
688 mpegts_set_stream_info(pes->st, pes, 0, 0);
691 pes->total_size = AV_RB16(pes->header + 4);
692 /* NOTE: a zero total size means the PES size is
694 if (!pes->total_size)
695 pes->total_size = MAX_PES_PAYLOAD;
697 /* allocate pes buffer */
698 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
700 return AVERROR(ENOMEM);
702 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
703 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
704 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
705 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
706 pes->state = MPEGTS_PESHEADER;
707 if (pes->st->codec->codec_id == CODEC_ID_NONE) {
708 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
709 pes->pid, pes->stream_type);
710 pes->st->codec->codec_id = CODEC_ID_PROBE;
713 pes->state = MPEGTS_PAYLOAD;
717 /* otherwise, it should be a table */
720 pes->state = MPEGTS_SKIP;
725 /**********************************************/
726 /* PES packing parsing */
727 case MPEGTS_PESHEADER:
728 len = PES_HEADER_SIZE - pes->data_index;
733 memcpy(pes->header + pes->data_index, p, len);
734 pes->data_index += len;
737 if (pes->data_index == PES_HEADER_SIZE) {
738 pes->pes_header_size = pes->header[8] + 9;
739 pes->state = MPEGTS_PESHEADER_FILL;
742 case MPEGTS_PESHEADER_FILL:
743 len = pes->pes_header_size - pes->data_index;
748 memcpy(pes->header + pes->data_index, p, len);
749 pes->data_index += len;
752 if (pes->data_index == pes->pes_header_size) {
754 unsigned int flags, pes_ext, skip;
756 flags = pes->header[7];
758 pes->pts = AV_NOPTS_VALUE;
759 pes->dts = AV_NOPTS_VALUE;
760 if ((flags & 0xc0) == 0x80) {
761 pes->dts = pes->pts = ff_parse_pes_pts(r);
763 } else if ((flags & 0xc0) == 0xc0) {
764 pes->pts = ff_parse_pes_pts(r);
766 pes->dts = ff_parse_pes_pts(r);
769 pes->extended_stream_id = -1;
770 if (flags & 0x01) { /* PES extension */
772 /* Skip PES private data, program packet sequence counter and P-STD buffer */
773 skip = (pes_ext >> 4) & 0xb;
776 if ((pes_ext & 0x41) == 0x01 &&
777 (r + 2) <= (pes->header + pes->pes_header_size)) {
778 /* PES extension 2 */
779 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
780 pes->extended_stream_id = r[1];
784 /* we got the full header. We parse it and get the payload */
785 pes->state = MPEGTS_PAYLOAD;
790 if (buf_size > 0 && pes->buffer) {
791 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
792 new_pes_packet(pes, ts->pkt);
793 pes->total_size = MAX_PES_PAYLOAD;
794 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
796 return AVERROR(ENOMEM);
798 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
799 // pes packet size is < ts size packet and pes data is padded with 0xff
800 // not sure if this is legal in ts but see issue #2392
801 buf_size = pes->total_size;
803 memcpy(pes->buffer+pes->data_index, p, buf_size);
804 pes->data_index += buf_size;
807 /* emit complete packets with known packet size
808 * decreases demuxer delay for infrequent packets like subtitles from
809 * a couple of seconds to milliseconds for properly muxed files.
810 * total_size is the number of bytes following pes_packet_length
811 * in the pes header, i.e. not counting the first 6 bytes */
812 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
813 pes->pes_header_size + pes->data_index == pes->total_size + 6) {
815 new_pes_packet(pes, ts->pkt);
827 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
832 /* if no pid found, then add a pid context */
833 pes = av_mallocz(sizeof(PESContext));
837 pes->stream = ts->stream;
839 pes->pcr_pid = pcr_pid;
840 pes->state = MPEGTS_SKIP;
841 pes->pts = AV_NOPTS_VALUE;
842 pes->dts = AV_NOPTS_VALUE;
843 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
851 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
852 int *es_id, uint8_t **dec_config_descr,
853 int *dec_config_descr_size)
859 ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
861 len = ff_mp4_read_descr(s, &pb, &tag);
862 if (tag == MP4IODescrTag) {
863 avio_rb16(&pb); // ID
869 len = ff_mp4_read_descr(s, &pb, &tag);
870 if (tag == MP4ESDescrTag) {
871 *es_id = avio_rb16(&pb); /* ES_ID */
872 av_dlog(s, "ES_ID %#x\n", *es_id);
873 avio_r8(&pb); /* priority */
874 len = ff_mp4_read_descr(s, &pb, &tag);
875 if (tag == MP4DecConfigDescrTag) {
876 *dec_config_descr = av_malloc(len);
877 if (!*dec_config_descr)
878 return AVERROR(ENOMEM);
879 *dec_config_descr_size = len;
880 avio_read(&pb, *dec_config_descr, len);
887 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
888 const uint8_t **pp, const uint8_t *desc_list_end,
889 int mp4_dec_config_descr_len, int mp4_es_id, int pid,
890 uint8_t *mp4_dec_config_descr)
892 const uint8_t *desc_end;
893 int desc_len, desc_tag;
896 desc_tag = get8(pp, desc_list_end);
899 desc_len = get8(pp, desc_list_end);
902 desc_end = *pp + desc_len;
903 if (desc_end > desc_list_end)
906 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
908 if (st->codec->codec_id == CODEC_ID_NONE &&
909 stream_type == STREAM_TYPE_PRIVATE_DATA)
910 mpegts_find_stream_type(st, desc_tag, DESC_types);
913 case 0x1F: /* FMC descriptor */
915 if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
916 mp4_dec_config_descr_len && mp4_es_id == pid) {
918 ffio_init_context(&pb, mp4_dec_config_descr,
919 mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
920 ff_mp4_read_dec_config_descr(fc, st, &pb);
921 if (st->codec->codec_id == CODEC_ID_AAC &&
922 st->codec->extradata_size > 0)
923 st->need_parsing = 0;
926 case 0x56: /* DVB teletext descriptor */
927 language[0] = get8(pp, desc_end);
928 language[1] = get8(pp, desc_end);
929 language[2] = get8(pp, desc_end);
931 av_metadata_set2(&st->metadata, "language", language, 0);
933 case 0x59: /* subtitling descriptor */
934 language[0] = get8(pp, desc_end);
935 language[1] = get8(pp, desc_end);
936 language[2] = get8(pp, desc_end);
939 if (st->codec->extradata) {
940 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
941 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
943 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
944 if (st->codec->extradata) {
945 st->codec->extradata_size = 4;
946 memcpy(st->codec->extradata, *pp, 4);
950 av_metadata_set2(&st->metadata, "language", language, 0);
952 case 0x0a: /* ISO 639 language descriptor */
953 language[0] = get8(pp, desc_end);
954 language[1] = get8(pp, desc_end);
955 language[2] = get8(pp, desc_end);
957 av_metadata_set2(&st->metadata, "language", language, 0);
958 switch (get8(pp, desc_end)) {
959 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
960 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
961 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
964 case 0x05: /* registration descriptor */
965 st->codec->codec_tag = bytestream_get_le32(pp);
966 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
967 if (st->codec->codec_id == CODEC_ID_NONE &&
968 stream_type == STREAM_TYPE_PRIVATE_DATA)
969 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
978 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
980 MpegTSContext *ts = filter->u.section_filter.opaque;
981 SectionHeader h1, *h = &h1;
984 const uint8_t *p, *p_end, *desc_list_end;
985 int program_info_length, pcr_pid, pid, stream_type;
987 uint32_t prog_reg_desc = 0; /* registration descriptor */
988 uint8_t *mp4_dec_config_descr = NULL;
989 int mp4_dec_config_descr_len = 0;
993 av_dlog(ts->stream, "PMT: len %i\n", section_len);
994 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
997 p_end = section + section_len - 4;
999 if (parse_section_header(h, &p, p_end) < 0)
1002 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1003 h->id, h->sec_num, h->last_sec_num);
1005 if (h->tid != PMT_TID)
1008 clear_program(ts, h->id);
1009 pcr_pid = get16(&p, p_end) & 0x1fff;
1012 add_pid_to_pmt(ts, h->id, pcr_pid);
1014 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1016 program_info_length = get16(&p, p_end) & 0xfff;
1017 if (program_info_length < 0)
1019 while(program_info_length >= 2) {
1021 tag = get8(&p, p_end);
1022 len = get8(&p, p_end);
1024 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1026 if(len > program_info_length - 2)
1027 //something else is broken, exit the program_descriptors_loop
1029 program_info_length -= len + 2;
1030 if (tag == 0x1d) { // IOD descriptor
1031 get8(&p, p_end); // scope
1032 get8(&p, p_end); // label
1034 mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1035 &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1036 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1037 prog_reg_desc = bytestream_get_le32(&p);
1042 p += program_info_length;
1046 // stop parsing after pmt, we found header
1047 if (!ts->stream->nb_streams)
1052 stream_type = get8(&p, p_end);
1053 if (stream_type < 0)
1055 pid = get16(&p, p_end) & 0x1fff;
1059 /* now create ffmpeg stream */
1060 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1061 pes = ts->pids[pid]->u.pes_filter.opaque;
1063 pes->st = av_new_stream(pes->stream, pes->pid);
1066 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1067 pes = add_pes_stream(ts, pid, pcr_pid);
1069 st = av_new_stream(pes->stream, pes->pid);
1075 if (!pes->stream_type)
1076 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1078 add_pid_to_pmt(ts, h->id, pid);
1080 ff_program_add_stream_index(ts->stream, h->id, st->index);
1082 desc_list_len = get16(&p, p_end) & 0xfff;
1083 if (desc_list_len < 0)
1085 desc_list_end = p + desc_list_len;
1086 if (desc_list_end > p_end)
1089 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1090 mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1093 if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1094 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1095 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1102 av_free(mp4_dec_config_descr);
1105 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1107 MpegTSContext *ts = filter->u.section_filter.opaque;
1108 SectionHeader h1, *h = &h1;
1109 const uint8_t *p, *p_end;
1113 av_dlog(ts->stream, "PAT:\n");
1114 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1116 p_end = section + section_len - 4;
1118 if (parse_section_header(h, &p, p_end) < 0)
1120 if (h->tid != PAT_TID)
1125 sid = get16(&p, p_end);
1128 pmt_pid = get16(&p, p_end) & 0x1fff;
1132 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1134 if (sid == 0x0000) {
1137 av_new_program(ts->stream, sid);
1138 if (ts->pids[pmt_pid])
1139 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1140 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1141 add_pat_entry(ts, sid);
1142 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1143 add_pid_to_pmt(ts, sid, pmt_pid);
1148 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1150 MpegTSContext *ts = filter->u.section_filter.opaque;
1151 SectionHeader h1, *h = &h1;
1152 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1153 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1154 char *name, *provider_name;
1157 av_dlog(ts->stream, "SDT:\n");
1158 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1161 p_end = section + section_len - 4;
1163 if (parse_section_header(h, &p, p_end) < 0)
1165 if (h->tid != SDT_TID)
1167 onid = get16(&p, p_end);
1170 val = get8(&p, p_end);
1174 sid = get16(&p, p_end);
1177 val = get8(&p, p_end);
1180 desc_list_len = get16(&p, p_end) & 0xfff;
1181 if (desc_list_len < 0)
1183 desc_list_end = p + desc_list_len;
1184 if (desc_list_end > p_end)
1187 desc_tag = get8(&p, desc_list_end);
1190 desc_len = get8(&p, desc_list_end);
1191 desc_end = p + desc_len;
1192 if (desc_end > desc_list_end)
1195 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1196 desc_tag, desc_len);
1200 service_type = get8(&p, p_end);
1201 if (service_type < 0)
1203 provider_name = getstr8(&p, p_end);
1206 name = getstr8(&p, p_end);
1208 AVProgram *program = av_new_program(ts->stream, sid);
1210 av_metadata_set2(&program->metadata, "service_name", name, 0);
1211 av_metadata_set2(&program->metadata, "service_provider", provider_name, 0);
1215 av_free(provider_name);
1226 /* handle one TS packet */
1227 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1229 AVFormatContext *s = ts->stream;
1231 int len, pid, cc, cc_ok, afc, is_start;
1232 const uint8_t *p, *p_end;
1235 pid = AV_RB16(packet + 1) & 0x1fff;
1236 if(pid && discard_pid(ts, pid))
1238 is_start = packet[1] & 0x40;
1239 tss = ts->pids[pid];
1240 if (ts->auto_guess && tss == NULL && is_start) {
1241 add_pes_stream(ts, pid, -1);
1242 tss = ts->pids[pid];
1247 /* continuity check (currently not used) */
1248 cc = (packet[3] & 0xf);
1249 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1252 /* skip adaptation field */
1253 afc = (packet[3] >> 4) & 3;
1255 if (afc == 0) /* reserved value */
1257 if (afc == 2) /* adaptation field only */
1260 /* skip adapation field */
1263 /* if past the end of packet, ignore */
1264 p_end = packet + TS_PACKET_SIZE;
1268 pos = avio_tell(ts->stream->pb);
1269 ts->pos47= pos % ts->raw_packet_size;
1271 if (tss->type == MPEGTS_SECTION) {
1273 /* pointer field present */
1275 if (p + len > p_end)
1278 /* write remaining section bytes */
1279 write_section_data(s, tss,
1281 /* check whether filter has been closed */
1287 write_section_data(s, tss,
1292 write_section_data(s, tss,
1298 // Note: The position here points actually behind the current packet.
1299 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1300 pos - ts->raw_packet_size)) < 0)
1307 /* XXX: try to find a better synchro over several packets (use
1308 get_packet_size() ?) */
1309 static int mpegts_resync(AVFormatContext *s)
1311 AVIOContext *pb = s->pb;
1314 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1319 avio_seek(pb, -1, SEEK_CUR);
1323 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1328 /* return -1 if error or EOF. Return 0 if OK. */
1329 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1331 AVIOContext *pb = s->pb;
1335 len = avio_read(pb, buf, TS_PACKET_SIZE);
1336 if (len != TS_PACKET_SIZE)
1337 return AVERROR(EIO);
1338 /* check paquet sync byte */
1339 if (buf[0] != 0x47) {
1340 /* find a new packet start */
1341 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1342 if (mpegts_resync(s) < 0)
1343 return AVERROR(EAGAIN);
1347 skip = raw_packet_size - TS_PACKET_SIZE;
1349 avio_seek(pb, skip, SEEK_CUR);
1356 static int handle_packets(MpegTSContext *ts, int nb_packets)
1358 AVFormatContext *s = ts->stream;
1359 uint8_t packet[TS_PACKET_SIZE];
1360 int packet_num, ret;
1365 if (ts->stop_parse>0)
1368 if (nb_packets != 0 && packet_num >= nb_packets)
1370 ret = read_packet(s, packet, ts->raw_packet_size);
1373 ret = handle_packet(ts, packet);
1380 static int mpegts_probe(AVProbeData *p)
1383 const int size= p->buf_size;
1384 int score, fec_score, dvhs_score;
1385 int check_count= size / TS_FEC_PACKET_SIZE;
1386 #define CHECK_COUNT 10
1388 if (check_count < CHECK_COUNT)
1391 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1392 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1393 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1394 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1396 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1397 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1398 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1399 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1402 /* only use the extension for safer guess */
1403 if (av_match_ext(p->filename, "ts"))
1404 return AVPROBE_SCORE_MAX;
1410 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1411 (-1) if not available */
1412 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1413 const uint8_t *packet)
1415 int afc, len, flags;
1419 afc = (packet[3] >> 4) & 3;
1429 if (!(flags & 0x10))
1434 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1435 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1439 static int mpegts_read_header(AVFormatContext *s,
1440 AVFormatParameters *ap)
1442 MpegTSContext *ts = s->priv_data;
1443 AVIOContext *pb = s->pb;
1444 uint8_t buf[5*1024];
1449 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1450 if(ap->mpeg2ts_raw){
1451 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1456 /* read the first 1024 bytes to get packet size */
1457 pos = avio_tell(pb);
1458 len = avio_read(pb, buf, sizeof(buf));
1459 if (len != sizeof(buf))
1461 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1462 if (ts->raw_packet_size <= 0)
1467 if (s->iformat == &ff_mpegts_demuxer) {
1470 /* first do a scaning to get all the services */
1471 if (avio_seek(pb, pos, SEEK_SET) < 0)
1472 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1474 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1476 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1478 handle_packets(ts, s->probesize / ts->raw_packet_size);
1479 /* if could not find service, enable auto_guess */
1483 av_dlog(ts->stream, "tuning done\n");
1485 s->ctx_flags |= AVFMTCTX_NOHEADER;
1488 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1489 int64_t pcrs[2], pcr_h;
1490 int packet_count[2];
1491 uint8_t packet[TS_PACKET_SIZE];
1493 /* only read packets */
1495 st = av_new_stream(s, 0);
1498 av_set_pts_info(st, 60, 1, 27000000);
1499 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1500 st->codec->codec_id = CODEC_ID_MPEG2TS;
1502 /* we iterate until we find two PCRs to estimate the bitrate */
1507 ret = read_packet(s, packet, ts->raw_packet_size);
1510 pid = AV_RB16(packet + 1) & 0x1fff;
1511 if ((pcr_pid == -1 || pcr_pid == pid) &&
1512 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1514 packet_count[nb_pcrs] = nb_packets;
1515 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1523 /* NOTE1: the bitrate is computed without the FEC */
1524 /* NOTE2: it is only the bitrate of the start of the stream */
1525 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1526 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1527 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1528 st->codec->bit_rate = s->bit_rate;
1529 st->start_time = ts->cur_pcr;
1531 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1532 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1536 avio_seek(pb, pos, SEEK_SET);
1542 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1544 static int mpegts_raw_read_packet(AVFormatContext *s,
1547 MpegTSContext *ts = s->priv_data;
1549 int64_t pcr_h, next_pcr_h, pos;
1550 int pcr_l, next_pcr_l;
1551 uint8_t pcr_buf[12];
1553 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1554 return AVERROR(ENOMEM);
1555 pkt->pos= avio_tell(s->pb);
1556 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1558 av_free_packet(pkt);
1561 if (ts->mpeg2ts_compute_pcr) {
1562 /* compute exact PCR for each packet */
1563 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1564 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1565 pos = avio_tell(s->pb);
1566 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1567 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1568 avio_read(s->pb, pcr_buf, 12);
1569 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1570 /* XXX: not precise enough */
1571 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1576 avio_seek(s->pb, pos, SEEK_SET);
1577 /* no next PCR found: we use previous increment */
1578 ts->cur_pcr = pcr_h * 300 + pcr_l;
1580 pkt->pts = ts->cur_pcr;
1581 pkt->duration = ts->pcr_incr;
1582 ts->cur_pcr += ts->pcr_incr;
1584 pkt->stream_index = 0;
1588 static int mpegts_read_packet(AVFormatContext *s,
1591 MpegTSContext *ts = s->priv_data;
1594 if (avio_tell(s->pb) != ts->last_pos) {
1595 /* seek detected, flush pes buffer */
1596 for (i = 0; i < NB_PID_MAX; i++) {
1597 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1598 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1599 av_freep(&pes->buffer);
1600 pes->data_index = 0;
1601 pes->state = MPEGTS_SKIP; /* skip until pes header */
1607 ret = handle_packets(ts, 0);
1609 /* flush pes data left */
1610 for (i = 0; i < NB_PID_MAX; i++) {
1611 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1612 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1613 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1614 new_pes_packet(pes, pkt);
1615 pes->state = MPEGTS_SKIP;
1623 ts->last_pos = avio_tell(s->pb);
1628 static int mpegts_read_close(AVFormatContext *s)
1630 MpegTSContext *ts = s->priv_data;
1635 for(i=0;i<NB_PID_MAX;i++)
1636 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1641 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1642 int64_t *ppos, int64_t pos_limit)
1644 MpegTSContext *ts = s->priv_data;
1645 int64_t pos, timestamp;
1646 uint8_t buf[TS_PACKET_SIZE];
1647 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1648 const int find_next= 1;
1649 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1652 avio_seek(s->pb, pos, SEEK_SET);
1653 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1654 return AV_NOPTS_VALUE;
1655 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1656 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1659 pos += ts->raw_packet_size;
1663 pos -= ts->raw_packet_size;
1665 return AV_NOPTS_VALUE;
1666 avio_seek(s->pb, pos, SEEK_SET);
1667 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1668 return AV_NOPTS_VALUE;
1669 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1670 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1680 #ifdef USE_SYNCPOINT_SEARCH
1682 static int read_seek2(AVFormatContext *s,
1691 int64_t ts_ret, ts_adj;
1692 int stream_index_gen_search;
1694 AVParserState *backup;
1696 backup = ff_store_parser_state(s);
1698 // detect direction of seeking for search purposes
1699 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1700 AVSEEK_FLAG_BACKWARD : 0;
1702 if (flags & AVSEEK_FLAG_BYTE) {
1703 // use position directly, we will search starting from it
1706 // search for some position with good timestamp match
1707 if (stream_index < 0) {
1708 stream_index_gen_search = av_find_default_stream_index(s);
1709 if (stream_index_gen_search < 0) {
1710 ff_restore_parser_state(s, backup);
1714 st = s->streams[stream_index_gen_search];
1715 // timestamp for default must be expressed in AV_TIME_BASE units
1716 ts_adj = av_rescale(target_ts,
1718 AV_TIME_BASE * (int64_t)st->time_base.num);
1721 stream_index_gen_search = stream_index;
1723 pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1727 flags, &ts_ret, mpegts_get_pcr);
1729 ff_restore_parser_state(s, backup);
1734 // search for actual matching keyframe/starting position for all streams
1735 if (ff_gen_syncpoint_search(s, stream_index, pos,
1736 min_ts, target_ts, max_ts,
1738 ff_restore_parser_state(s, backup);
1742 ff_free_parser_state(s, backup);
1746 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1749 if (flags & AVSEEK_FLAG_BACKWARD) {
1750 flags &= ~AVSEEK_FLAG_BACKWARD;
1751 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1753 // for compatibility reasons, seek to the best-fitting timestamp
1754 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1756 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1758 // for compatibility reasons, seek to the best-fitting timestamp
1759 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1766 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1767 MpegTSContext *ts = s->priv_data;
1768 uint8_t buf[TS_PACKET_SIZE];
1771 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1774 pos= avio_tell(s->pb);
1777 avio_seek(s->pb, pos, SEEK_SET);
1778 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1780 // pid = AV_RB16(buf + 1) & 0x1fff;
1781 if(buf[1] & 0x40) break;
1782 pos += ts->raw_packet_size;
1784 avio_seek(s->pb, pos, SEEK_SET);
1791 /**************************************************************/
1792 /* parsing functions - called from other demuxers such as RTP */
1794 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1798 ts = av_mallocz(sizeof(MpegTSContext));
1801 /* no stream case, currently used by RTP */
1802 ts->raw_packet_size = TS_PACKET_SIZE;
1808 /* return the consumed length if a packet was output, or -1 if no
1810 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1811 const uint8_t *buf, int len)
1819 if (ts->stop_parse>0)
1821 if (len < TS_PACKET_SIZE)
1823 if (buf[0] != 0x47) {
1827 handle_packet(ts, buf);
1828 buf += TS_PACKET_SIZE;
1829 len -= TS_PACKET_SIZE;
1835 void ff_mpegts_parse_close(MpegTSContext *ts)
1839 for(i=0;i<NB_PID_MAX;i++)
1840 av_free(ts->pids[i]);
1844 AVInputFormat ff_mpegts_demuxer = {
1846 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1847 sizeof(MpegTSContext),
1854 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1855 #ifdef USE_SYNCPOINT_SEARCH
1856 .read_seek2 = read_seek2,
1860 AVInputFormat ff_mpegtsraw_demuxer = {
1862 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1863 sizeof(MpegTSContext),
1866 mpegts_raw_read_packet,
1870 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1871 #ifdef USE_SYNCPOINT_SEARCH
1872 .read_seek2 = read_seek2,