2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 //#define USE_SYNCPOINT_SEARCH
24 #include "libavutil/crc.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/opt.h"
30 #include "libavcodec/bytestream.h"
34 #include "avio_internal.h"
39 /* maximum size in which we look for synchronisation if
40 synchronisation is lost */
41 #define MAX_RESYNC_SIZE 65536
43 #define MAX_PES_PAYLOAD 200*1024
45 enum MpegTSFilterType {
50 typedef struct MpegTSFilter MpegTSFilter;
52 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
54 typedef struct MpegTSPESFilter {
59 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
61 typedef void SetServiceCallback(void *opaque, int ret);
63 typedef struct MpegTSSectionFilter {
67 unsigned int check_crc:1;
68 unsigned int end_of_section_reached:1;
69 SectionCallback *section_cb;
71 } MpegTSSectionFilter;
75 int last_cc; /* last cc code (-1 if first packet) */
76 enum MpegTSFilterType type;
78 MpegTSPESFilter pes_filter;
79 MpegTSSectionFilter section_filter;
83 #define MAX_PIDS_PER_PROGRAM 64
85 unsigned int id; //program id/service id
87 unsigned int pids[MAX_PIDS_PER_PROGRAM];
90 struct MpegTSContext {
93 AVFormatContext *stream;
94 /** raw packet size, including FEC if present */
99 /** if true, all pids are analyzed to find streams */
102 /** compute exact PCR for each transport stream packet */
103 int mpeg2ts_compute_pcr;
105 int64_t cur_pcr; /**< used to estimate the exact PCR */
106 int pcr_incr; /**< used to estimate the exact PCR */
108 /* data needed to handle file based ts */
109 /** stop parsing loop */
111 /** packet containing Audio/Video data */
113 /** to detect seek */
116 /******************************************/
117 /* private mpegts data */
119 /** structure to keep track of Program->pids mapping */
124 /** filters for various streams specified by PMT + for the PAT and PMT */
125 MpegTSFilter *pids[NB_PID_MAX];
128 static const AVOption options[] = {
129 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), FF_OPT_TYPE_INT,
130 {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
134 static const AVClass mpegtsraw_class = {
135 .class_name = "mpegtsraw demuxer",
136 .item_name = av_default_item_name,
138 .version = LIBAVUTIL_VERSION_INT,
141 /* TS stream handling */
146 MPEGTS_PESHEADER_FILL,
151 /* enough for PES header + length */
152 #define PES_START_SIZE 6
153 #define PES_HEADER_SIZE 9
154 #define MAX_PES_HEADER_SIZE (9 + 255)
156 typedef struct PESContext {
158 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
161 AVFormatContext *stream;
163 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
164 enum MpegTSState state;
165 /* used to get the format */
169 int extended_stream_id;
171 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
172 uint8_t header[MAX_PES_HEADER_SIZE];
176 extern AVInputFormat ff_mpegts_demuxer;
178 static void clear_program(MpegTSContext *ts, unsigned int programid)
182 for(i=0; i<ts->nb_prg; i++)
183 if(ts->prg[i].id == programid)
184 ts->prg[i].nb_pids = 0;
187 static void clear_programs(MpegTSContext *ts)
193 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
196 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
200 p = &ts->prg[ts->nb_prg];
206 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
209 struct Program *p = NULL;
210 for(i=0; i<ts->nb_prg; i++) {
211 if(ts->prg[i].id == programid) {
219 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
221 p->pids[p->nb_pids++] = pid;
225 * @brief discard_pid() decides if the pid is to be discarded according
226 * to caller's programs selection
227 * @param ts : - TS context
229 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
232 static int discard_pid(MpegTSContext *ts, unsigned int pid)
235 int used = 0, discarded = 0;
237 for(i=0; i<ts->nb_prg; i++) {
239 for(j=0; j<p->nb_pids; j++) {
240 if(p->pids[j] != pid)
242 //is program with id p->id set to be discarded?
243 for(k=0; k<ts->stream->nb_programs; k++) {
244 if(ts->stream->programs[k]->id == p->id) {
245 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
254 return !used && discarded;
258 * Assemble PES packets out of TS packets, and then call the "section_cb"
259 * function when they are complete.
261 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
262 const uint8_t *buf, int buf_size, int is_start)
264 MpegTSSectionFilter *tss = &tss1->u.section_filter;
268 memcpy(tss->section_buf, buf, buf_size);
269 tss->section_index = buf_size;
270 tss->section_h_size = -1;
271 tss->end_of_section_reached = 0;
273 if (tss->end_of_section_reached)
275 len = 4096 - tss->section_index;
278 memcpy(tss->section_buf + tss->section_index, buf, len);
279 tss->section_index += len;
282 /* compute section length if possible */
283 if (tss->section_h_size == -1 && tss->section_index >= 3) {
284 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
287 tss->section_h_size = len;
290 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
291 tss->end_of_section_reached = 1;
292 if (!tss->check_crc ||
293 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
294 tss->section_buf, tss->section_h_size) == 0)
295 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
299 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
300 SectionCallback *section_cb, void *opaque,
304 MpegTSFilter *filter;
305 MpegTSSectionFilter *sec;
307 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
309 if (pid >= NB_PID_MAX || ts->pids[pid])
311 filter = av_mallocz(sizeof(MpegTSFilter));
314 ts->pids[pid] = filter;
315 filter->type = MPEGTS_SECTION;
317 filter->last_cc = -1;
318 sec = &filter->u.section_filter;
319 sec->section_cb = section_cb;
320 sec->opaque = opaque;
321 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
322 sec->check_crc = check_crc;
323 if (!sec->section_buf) {
330 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
334 MpegTSFilter *filter;
335 MpegTSPESFilter *pes;
337 if (pid >= NB_PID_MAX || ts->pids[pid])
339 filter = av_mallocz(sizeof(MpegTSFilter));
342 ts->pids[pid] = filter;
343 filter->type = MPEGTS_PES;
345 filter->last_cc = -1;
346 pes = &filter->u.pes_filter;
347 pes->pes_cb = pes_cb;
348 pes->opaque = opaque;
352 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
357 if (filter->type == MPEGTS_SECTION)
358 av_freep(&filter->u.section_filter.section_buf);
359 else if (filter->type == MPEGTS_PES) {
360 PESContext *pes = filter->u.pes_filter.opaque;
361 av_freep(&pes->buffer);
362 /* referenced private data will be freed later in
363 * av_close_input_stream */
364 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
365 av_freep(&filter->u.pes_filter.opaque);
370 ts->pids[pid] = NULL;
373 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
374 int stat[TS_MAX_PACKET_SIZE];
379 memset(stat, 0, packet_size*sizeof(int));
381 for(x=i=0; i<size-3; i++){
382 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
384 if(stat[x] > best_score){
391 if(x == packet_size) x= 0;
397 /* autodetect fec presence. Must have at least 1024 bytes */
398 static int get_packet_size(const uint8_t *buf, int size)
400 int score, fec_score, dvhs_score;
402 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
405 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
406 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
407 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
408 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
410 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
411 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
412 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
416 typedef struct SectionHeader {
421 uint8_t last_sec_num;
424 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
437 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
443 if ((p + 1) >= p_end)
451 /* read and allocate a DVB string preceeded by its length */
452 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
459 len = get8(&p, p_end);
462 if ((p + len) > p_end)
464 str = av_malloc(len + 1);
474 static int parse_section_header(SectionHeader *h,
475 const uint8_t **pp, const uint8_t *p_end)
479 val = get8(pp, p_end);
484 val = get16(pp, p_end);
488 val = get8(pp, p_end);
491 h->version = (val >> 1) & 0x1f;
492 val = get8(pp, p_end);
496 val = get8(pp, p_end);
499 h->last_sec_num = val;
504 uint32_t stream_type;
505 enum AVMediaType codec_type;
506 enum CodecID codec_id;
509 static const StreamType ISO_types[] = {
510 { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
511 { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
512 { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
513 { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
514 { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
515 { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
516 { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
517 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
518 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
519 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
523 static const StreamType HDMV_types[] = {
524 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
525 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
526 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
527 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
528 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
529 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
534 static const StreamType MISC_types[] = {
535 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
536 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
540 static const StreamType REGD_types[] = {
541 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
542 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
543 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
547 /* descriptor present */
548 static const StreamType DESC_types[] = {
549 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
550 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
551 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
552 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
553 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
557 static void mpegts_find_stream_type(AVStream *st,
558 uint32_t stream_type, const StreamType *types)
560 for (; types->stream_type; types++) {
561 if (stream_type == types->stream_type) {
562 st->codec->codec_type = types->codec_type;
563 st->codec->codec_id = types->codec_id;
569 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
570 uint32_t stream_type, uint32_t prog_reg_desc)
572 av_set_pts_info(st, 33, 1, 90000);
574 st->codec->codec_type = AVMEDIA_TYPE_DATA;
575 st->codec->codec_id = CODEC_ID_NONE;
576 st->need_parsing = AVSTREAM_PARSE_FULL;
578 pes->stream_type = stream_type;
580 av_log(pes->stream, AV_LOG_DEBUG,
581 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
582 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
584 st->codec->codec_tag = pes->stream_type;
586 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
587 if (prog_reg_desc == AV_RL32("HDMV") &&
588 st->codec->codec_id == CODEC_ID_NONE) {
589 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
590 if (pes->stream_type == 0x83) {
591 // HDMV TrueHD streams also contain an AC3 coded version of the
592 // audio track - add a second stream for this
594 // priv_data cannot be shared between streams
595 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
597 return AVERROR(ENOMEM);
598 memcpy(sub_pes, pes, sizeof(*sub_pes));
600 sub_st = av_new_stream(pes->stream, pes->pid);
603 return AVERROR(ENOMEM);
606 av_set_pts_info(sub_st, 33, 1, 90000);
607 sub_st->priv_data = sub_pes;
608 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
609 sub_st->codec->codec_id = CODEC_ID_AC3;
610 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
611 sub_pes->sub_st = pes->sub_st = sub_st;
614 if (st->codec->codec_id == CODEC_ID_NONE)
615 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
620 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
624 pkt->destruct = av_destruct_packet;
625 pkt->data = pes->buffer;
626 pkt->size = pes->data_index;
627 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
629 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
630 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
631 pkt->stream_index = pes->sub_st->index;
633 pkt->stream_index = pes->st->index;
636 /* store position of first TS packet of this PES packet */
637 pkt->pos = pes->ts_packet_pos;
639 /* reset pts values */
640 pes->pts = AV_NOPTS_VALUE;
641 pes->dts = AV_NOPTS_VALUE;
646 /* return non zero if a packet could be constructed */
647 static int mpegts_push_data(MpegTSFilter *filter,
648 const uint8_t *buf, int buf_size, int is_start,
651 PESContext *pes = filter->u.pes_filter.opaque;
652 MpegTSContext *ts = pes->ts;
660 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
661 new_pes_packet(pes, ts->pkt);
664 pes->state = MPEGTS_HEADER;
666 pes->ts_packet_pos = pos;
669 while (buf_size > 0) {
672 len = PES_START_SIZE - pes->data_index;
675 memcpy(pes->header + pes->data_index, p, len);
676 pes->data_index += len;
679 if (pes->data_index == PES_START_SIZE) {
680 /* we got all the PES or section header. We can now
682 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
683 pes->header[2] == 0x01) {
684 /* it must be an mpeg2 PES stream */
685 code = pes->header[3] | 0x100;
686 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
688 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
689 code == 0x1be) /* padding_stream */
692 /* stream not present in PMT */
694 pes->st = av_new_stream(ts->stream, pes->pid);
696 return AVERROR(ENOMEM);
697 mpegts_set_stream_info(pes->st, pes, 0, 0);
700 pes->total_size = AV_RB16(pes->header + 4);
701 /* NOTE: a zero total size means the PES size is
703 if (!pes->total_size)
704 pes->total_size = MAX_PES_PAYLOAD;
706 /* allocate pes buffer */
707 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
709 return AVERROR(ENOMEM);
711 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
712 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
713 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
714 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
715 pes->state = MPEGTS_PESHEADER;
716 if (pes->st->codec->codec_id == CODEC_ID_NONE) {
717 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
718 pes->pid, pes->stream_type);
719 pes->st->codec->codec_id = CODEC_ID_PROBE;
722 pes->state = MPEGTS_PAYLOAD;
726 /* otherwise, it should be a table */
729 pes->state = MPEGTS_SKIP;
734 /**********************************************/
735 /* PES packing parsing */
736 case MPEGTS_PESHEADER:
737 len = 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_HEADER_SIZE) {
747 pes->pes_header_size = pes->header[8] + 9;
748 pes->state = MPEGTS_PESHEADER_FILL;
751 case MPEGTS_PESHEADER_FILL:
752 len = pes->pes_header_size - pes->data_index;
757 memcpy(pes->header + pes->data_index, p, len);
758 pes->data_index += len;
761 if (pes->data_index == pes->pes_header_size) {
763 unsigned int flags, pes_ext, skip;
765 flags = pes->header[7];
767 pes->pts = AV_NOPTS_VALUE;
768 pes->dts = AV_NOPTS_VALUE;
769 if ((flags & 0xc0) == 0x80) {
770 pes->dts = pes->pts = ff_parse_pes_pts(r);
772 } else if ((flags & 0xc0) == 0xc0) {
773 pes->pts = ff_parse_pes_pts(r);
775 pes->dts = ff_parse_pes_pts(r);
778 pes->extended_stream_id = -1;
779 if (flags & 0x01) { /* PES extension */
781 /* Skip PES private data, program packet sequence counter and P-STD buffer */
782 skip = (pes_ext >> 4) & 0xb;
785 if ((pes_ext & 0x41) == 0x01 &&
786 (r + 2) <= (pes->header + pes->pes_header_size)) {
787 /* PES extension 2 */
788 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
789 pes->extended_stream_id = r[1];
793 /* we got the full header. We parse it and get the payload */
794 pes->state = MPEGTS_PAYLOAD;
799 if (buf_size > 0 && pes->buffer) {
800 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
801 new_pes_packet(pes, ts->pkt);
802 pes->total_size = MAX_PES_PAYLOAD;
803 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
805 return AVERROR(ENOMEM);
807 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
808 // pes packet size is < ts size packet and pes data is padded with 0xff
809 // not sure if this is legal in ts but see issue #2392
810 buf_size = pes->total_size;
812 memcpy(pes->buffer+pes->data_index, p, buf_size);
813 pes->data_index += buf_size;
816 /* emit complete packets with known packet size
817 * decreases demuxer delay for infrequent packets like subtitles from
818 * a couple of seconds to milliseconds for properly muxed files.
819 * total_size is the number of bytes following pes_packet_length
820 * in the pes header, i.e. not counting the first 6 bytes */
821 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
822 pes->pes_header_size + pes->data_index == pes->total_size + 6) {
824 new_pes_packet(pes, ts->pkt);
836 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
841 /* if no pid found, then add a pid context */
842 pes = av_mallocz(sizeof(PESContext));
846 pes->stream = ts->stream;
848 pes->pcr_pid = pcr_pid;
849 pes->state = MPEGTS_SKIP;
850 pes->pts = AV_NOPTS_VALUE;
851 pes->dts = AV_NOPTS_VALUE;
852 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
860 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
861 int *es_id, uint8_t **dec_config_descr,
862 int *dec_config_descr_size)
868 ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
870 len = ff_mp4_read_descr(s, &pb, &tag);
871 if (tag == MP4IODescrTag) {
872 avio_rb16(&pb); // ID
878 len = ff_mp4_read_descr(s, &pb, &tag);
879 if (tag == MP4ESDescrTag) {
880 *es_id = avio_rb16(&pb); /* ES_ID */
881 av_dlog(s, "ES_ID %#x\n", *es_id);
882 avio_r8(&pb); /* priority */
883 len = ff_mp4_read_descr(s, &pb, &tag);
884 if (tag == MP4DecConfigDescrTag) {
885 *dec_config_descr = av_malloc(len);
886 if (!*dec_config_descr)
887 return AVERROR(ENOMEM);
888 *dec_config_descr_size = len;
889 avio_read(&pb, *dec_config_descr, len);
896 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
897 const uint8_t **pp, const uint8_t *desc_list_end,
898 int mp4_dec_config_descr_len, int mp4_es_id, int pid,
899 uint8_t *mp4_dec_config_descr)
901 const uint8_t *desc_end;
902 int desc_len, desc_tag;
906 desc_tag = get8(pp, desc_list_end);
909 desc_len = get8(pp, desc_list_end);
912 desc_end = *pp + desc_len;
913 if (desc_end > desc_list_end)
916 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
918 if (st->codec->codec_id == CODEC_ID_NONE &&
919 stream_type == STREAM_TYPE_PRIVATE_DATA)
920 mpegts_find_stream_type(st, desc_tag, DESC_types);
923 case 0x1F: /* FMC descriptor */
925 if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
926 mp4_dec_config_descr_len && mp4_es_id == pid) {
928 ffio_init_context(&pb, mp4_dec_config_descr,
929 mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
930 ff_mp4_read_dec_config_descr(fc, st, &pb);
931 if (st->codec->codec_id == CODEC_ID_AAC &&
932 st->codec->extradata_size > 0)
933 st->need_parsing = 0;
936 case 0x56: /* DVB teletext descriptor */
937 language[0] = get8(pp, desc_end);
938 language[1] = get8(pp, desc_end);
939 language[2] = get8(pp, desc_end);
941 av_dict_set(&st->metadata, "language", language, 0);
943 case 0x59: /* subtitling descriptor */
944 language[0] = get8(pp, desc_end);
945 language[1] = get8(pp, desc_end);
946 language[2] = get8(pp, desc_end);
948 /* hearing impaired subtitles detection */
949 switch(get8(pp, desc_end)) {
950 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
951 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
952 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
953 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
954 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
955 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
956 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
959 if (st->codec->extradata) {
960 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
961 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
963 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
964 if (st->codec->extradata) {
965 st->codec->extradata_size = 4;
966 memcpy(st->codec->extradata, *pp, 4);
970 av_dict_set(&st->metadata, "language", language, 0);
972 case 0x0a: /* ISO 639 language descriptor */
973 for (i = 0; i + 4 <= desc_len; i += 4) {
974 language[i + 0] = get8(pp, desc_end);
975 language[i + 1] = get8(pp, desc_end);
976 language[i + 2] = get8(pp, desc_end);
977 language[i + 3] = ',';
978 switch (get8(pp, desc_end)) {
979 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
980 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
981 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
986 av_dict_set(&st->metadata, "language", language, 0);
989 case 0x05: /* registration descriptor */
990 st->codec->codec_tag = bytestream_get_le32(pp);
991 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
992 if (st->codec->codec_id == CODEC_ID_NONE &&
993 stream_type == STREAM_TYPE_PRIVATE_DATA)
994 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1003 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1005 MpegTSContext *ts = filter->u.section_filter.opaque;
1006 SectionHeader h1, *h = &h1;
1009 const uint8_t *p, *p_end, *desc_list_end;
1010 int program_info_length, pcr_pid, pid, stream_type;
1012 uint32_t prog_reg_desc = 0; /* registration descriptor */
1013 uint8_t *mp4_dec_config_descr = NULL;
1014 int mp4_dec_config_descr_len = 0;
1017 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1018 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1020 p_end = section + section_len - 4;
1022 if (parse_section_header(h, &p, p_end) < 0)
1025 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1026 h->id, h->sec_num, h->last_sec_num);
1028 if (h->tid != PMT_TID)
1031 clear_program(ts, h->id);
1032 pcr_pid = get16(&p, p_end) & 0x1fff;
1035 add_pid_to_pmt(ts, h->id, pcr_pid);
1037 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1039 program_info_length = get16(&p, p_end) & 0xfff;
1040 if (program_info_length < 0)
1042 while(program_info_length >= 2) {
1044 tag = get8(&p, p_end);
1045 len = get8(&p, p_end);
1047 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1049 if(len > program_info_length - 2)
1050 //something else is broken, exit the program_descriptors_loop
1052 program_info_length -= len + 2;
1053 if (tag == 0x1d) { // IOD descriptor
1054 get8(&p, p_end); // scope
1055 get8(&p, p_end); // label
1057 mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1058 &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1059 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1060 prog_reg_desc = bytestream_get_le32(&p);
1065 p += program_info_length;
1069 // stop parsing after pmt, we found header
1070 if (!ts->stream->nb_streams)
1075 stream_type = get8(&p, p_end);
1076 if (stream_type < 0)
1078 pid = get16(&p, p_end) & 0x1fff;
1082 /* now create ffmpeg stream */
1083 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1084 pes = ts->pids[pid]->u.pes_filter.opaque;
1086 pes->st = av_new_stream(pes->stream, pes->pid);
1089 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1090 pes = add_pes_stream(ts, pid, pcr_pid);
1092 st = av_new_stream(pes->stream, pes->pid);
1098 if (!pes->stream_type)
1099 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1101 add_pid_to_pmt(ts, h->id, pid);
1103 ff_program_add_stream_index(ts->stream, h->id, st->index);
1105 desc_list_len = get16(&p, p_end) & 0xfff;
1106 if (desc_list_len < 0)
1108 desc_list_end = p + desc_list_len;
1109 if (desc_list_end > p_end)
1112 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1113 mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1116 if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1117 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1118 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1125 av_free(mp4_dec_config_descr);
1128 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1130 MpegTSContext *ts = filter->u.section_filter.opaque;
1131 SectionHeader h1, *h = &h1;
1132 const uint8_t *p, *p_end;
1135 av_dlog(ts->stream, "PAT:\n");
1136 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1138 p_end = section + section_len - 4;
1140 if (parse_section_header(h, &p, p_end) < 0)
1142 if (h->tid != PAT_TID)
1147 sid = get16(&p, p_end);
1150 pmt_pid = get16(&p, p_end) & 0x1fff;
1154 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1156 if (sid == 0x0000) {
1159 av_new_program(ts->stream, sid);
1160 if (ts->pids[pmt_pid])
1161 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1162 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1163 add_pat_entry(ts, sid);
1164 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1165 add_pid_to_pmt(ts, sid, pmt_pid);
1170 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1172 MpegTSContext *ts = filter->u.section_filter.opaque;
1173 SectionHeader h1, *h = &h1;
1174 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1175 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1176 char *name, *provider_name;
1178 av_dlog(ts->stream, "SDT:\n");
1179 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1181 p_end = section + section_len - 4;
1183 if (parse_section_header(h, &p, p_end) < 0)
1185 if (h->tid != SDT_TID)
1187 onid = get16(&p, p_end);
1190 val = get8(&p, p_end);
1194 sid = get16(&p, p_end);
1197 val = get8(&p, p_end);
1200 desc_list_len = get16(&p, p_end) & 0xfff;
1201 if (desc_list_len < 0)
1203 desc_list_end = p + desc_list_len;
1204 if (desc_list_end > p_end)
1207 desc_tag = get8(&p, desc_list_end);
1210 desc_len = get8(&p, desc_list_end);
1211 desc_end = p + desc_len;
1212 if (desc_end > desc_list_end)
1215 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1216 desc_tag, desc_len);
1220 service_type = get8(&p, p_end);
1221 if (service_type < 0)
1223 provider_name = getstr8(&p, p_end);
1226 name = getstr8(&p, p_end);
1228 AVProgram *program = av_new_program(ts->stream, sid);
1230 av_dict_set(&program->metadata, "service_name", name, 0);
1231 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1235 av_free(provider_name);
1246 /* handle one TS packet */
1247 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1249 AVFormatContext *s = ts->stream;
1251 int len, pid, cc, expected_cc, cc_ok, afc, is_start;
1252 const uint8_t *p, *p_end;
1255 pid = AV_RB16(packet + 1) & 0x1fff;
1256 if(pid && discard_pid(ts, pid))
1258 is_start = packet[1] & 0x40;
1259 tss = ts->pids[pid];
1260 if (ts->auto_guess && tss == NULL && is_start) {
1261 add_pes_stream(ts, pid, -1);
1262 tss = ts->pids[pid];
1267 /* continuity check (currently not used) */
1268 cc = (packet[3] & 0xf);
1269 expected_cc = (packet[3] & 0x10) ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1270 cc_ok = (tss->last_cc < 0) || (expected_cc == cc);
1273 /* skip adaptation field */
1274 afc = (packet[3] >> 4) & 3;
1276 if (afc == 0) /* reserved value */
1278 if (afc == 2) /* adaptation field only */
1281 /* skip adapation field */
1284 /* if past the end of packet, ignore */
1285 p_end = packet + TS_PACKET_SIZE;
1289 pos = avio_tell(ts->stream->pb);
1290 ts->pos47= pos % ts->raw_packet_size;
1292 if (tss->type == MPEGTS_SECTION) {
1294 /* pointer field present */
1296 if (p + len > p_end)
1299 /* write remaining section bytes */
1300 write_section_data(s, tss,
1302 /* check whether filter has been closed */
1308 write_section_data(s, tss,
1313 write_section_data(s, tss,
1319 // Note: The position here points actually behind the current packet.
1320 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1321 pos - ts->raw_packet_size)) < 0)
1328 /* XXX: try to find a better synchro over several packets (use
1329 get_packet_size() ?) */
1330 static int mpegts_resync(AVFormatContext *s)
1332 AVIOContext *pb = s->pb;
1335 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1337 if (pb->eof_reached)
1340 avio_seek(pb, -1, SEEK_CUR);
1344 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1349 /* return -1 if error or EOF. Return 0 if OK. */
1350 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1352 AVIOContext *pb = s->pb;
1356 len = avio_read(pb, buf, TS_PACKET_SIZE);
1357 if (len != TS_PACKET_SIZE)
1358 return len < 0 ? len : AVERROR_EOF;
1359 /* check paquet sync byte */
1360 if (buf[0] != 0x47) {
1361 /* find a new packet start */
1362 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1363 if (mpegts_resync(s) < 0)
1364 return AVERROR(EAGAIN);
1368 skip = raw_packet_size - TS_PACKET_SIZE;
1370 avio_skip(pb, skip);
1377 static int handle_packets(MpegTSContext *ts, int nb_packets)
1379 AVFormatContext *s = ts->stream;
1380 uint8_t packet[TS_PACKET_SIZE];
1381 int packet_num, ret;
1386 if (ts->stop_parse>0)
1389 if (nb_packets != 0 && packet_num >= nb_packets)
1391 ret = read_packet(s, packet, ts->raw_packet_size);
1394 ret = handle_packet(ts, packet);
1401 static int mpegts_probe(AVProbeData *p)
1404 const int size= p->buf_size;
1405 int score, fec_score, dvhs_score;
1406 int check_count= size / TS_FEC_PACKET_SIZE;
1407 #define CHECK_COUNT 10
1409 if (check_count < CHECK_COUNT)
1412 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1413 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1414 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1415 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1417 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1418 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1419 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1420 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1423 /* only use the extension for safer guess */
1424 if (av_match_ext(p->filename, "ts"))
1425 return AVPROBE_SCORE_MAX;
1431 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1432 (-1) if not available */
1433 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1434 const uint8_t *packet)
1436 int afc, len, flags;
1440 afc = (packet[3] >> 4) & 3;
1450 if (!(flags & 0x10))
1455 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1456 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1460 static int mpegts_read_header(AVFormatContext *s,
1461 AVFormatParameters *ap)
1463 MpegTSContext *ts = s->priv_data;
1464 AVIOContext *pb = s->pb;
1465 uint8_t buf[5*1024];
1469 #if FF_API_FORMAT_PARAMETERS
1471 if (ap->mpeg2ts_compute_pcr)
1472 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1473 if(ap->mpeg2ts_raw){
1474 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1480 /* read the first 1024 bytes to get packet size */
1481 pos = avio_tell(pb);
1482 len = avio_read(pb, buf, sizeof(buf));
1483 if (len != sizeof(buf))
1485 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1486 if (ts->raw_packet_size <= 0)
1491 if (s->iformat == &ff_mpegts_demuxer) {
1494 /* first do a scaning to get all the services */
1495 if (avio_seek(pb, pos, SEEK_SET) < 0)
1496 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1498 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1500 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1502 handle_packets(ts, s->probesize / ts->raw_packet_size);
1503 /* if could not find service, enable auto_guess */
1507 av_dlog(ts->stream, "tuning done\n");
1509 s->ctx_flags |= AVFMTCTX_NOHEADER;
1512 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1513 int64_t pcrs[2], pcr_h;
1514 int packet_count[2];
1515 uint8_t packet[TS_PACKET_SIZE];
1517 /* only read packets */
1519 st = av_new_stream(s, 0);
1522 av_set_pts_info(st, 60, 1, 27000000);
1523 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1524 st->codec->codec_id = CODEC_ID_MPEG2TS;
1526 /* we iterate until we find two PCRs to estimate the bitrate */
1531 ret = read_packet(s, packet, ts->raw_packet_size);
1534 pid = AV_RB16(packet + 1) & 0x1fff;
1535 if ((pcr_pid == -1 || pcr_pid == pid) &&
1536 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1538 packet_count[nb_pcrs] = nb_packets;
1539 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1547 /* NOTE1: the bitrate is computed without the FEC */
1548 /* NOTE2: it is only the bitrate of the start of the stream */
1549 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1550 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1551 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1552 st->codec->bit_rate = s->bit_rate;
1553 st->start_time = ts->cur_pcr;
1554 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1555 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1558 avio_seek(pb, pos, SEEK_SET);
1564 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1566 static int mpegts_raw_read_packet(AVFormatContext *s,
1569 MpegTSContext *ts = s->priv_data;
1571 int64_t pcr_h, next_pcr_h, pos;
1572 int pcr_l, next_pcr_l;
1573 uint8_t pcr_buf[12];
1575 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1576 return AVERROR(ENOMEM);
1577 pkt->pos= avio_tell(s->pb);
1578 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1580 av_free_packet(pkt);
1583 if (ts->mpeg2ts_compute_pcr) {
1584 /* compute exact PCR for each packet */
1585 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1586 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1587 pos = avio_tell(s->pb);
1588 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1589 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1590 avio_read(s->pb, pcr_buf, 12);
1591 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1592 /* XXX: not precise enough */
1593 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1598 avio_seek(s->pb, pos, SEEK_SET);
1599 /* no next PCR found: we use previous increment */
1600 ts->cur_pcr = pcr_h * 300 + pcr_l;
1602 pkt->pts = ts->cur_pcr;
1603 pkt->duration = ts->pcr_incr;
1604 ts->cur_pcr += ts->pcr_incr;
1606 pkt->stream_index = 0;
1610 static int mpegts_read_packet(AVFormatContext *s,
1613 MpegTSContext *ts = s->priv_data;
1616 if (avio_tell(s->pb) != ts->last_pos) {
1617 /* seek detected, flush pes buffer */
1618 for (i = 0; i < NB_PID_MAX; i++) {
1619 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1620 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1621 av_freep(&pes->buffer);
1622 pes->data_index = 0;
1623 pes->state = MPEGTS_SKIP; /* skip until pes header */
1629 ret = handle_packets(ts, 0);
1631 /* flush pes data left */
1632 for (i = 0; i < NB_PID_MAX; i++) {
1633 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1634 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1635 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1636 new_pes_packet(pes, pkt);
1637 pes->state = MPEGTS_SKIP;
1645 ts->last_pos = avio_tell(s->pb);
1650 static int mpegts_read_close(AVFormatContext *s)
1652 MpegTSContext *ts = s->priv_data;
1657 for(i=0;i<NB_PID_MAX;i++)
1658 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1663 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1664 int64_t *ppos, int64_t pos_limit)
1666 MpegTSContext *ts = s->priv_data;
1667 int64_t pos, timestamp;
1668 uint8_t buf[TS_PACKET_SIZE];
1669 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1670 const int find_next= 1;
1671 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1674 avio_seek(s->pb, pos, SEEK_SET);
1675 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1676 return AV_NOPTS_VALUE;
1677 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1678 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1681 pos += ts->raw_packet_size;
1685 pos -= ts->raw_packet_size;
1687 return AV_NOPTS_VALUE;
1688 avio_seek(s->pb, pos, SEEK_SET);
1689 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1690 return AV_NOPTS_VALUE;
1691 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1692 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1702 #ifdef USE_SYNCPOINT_SEARCH
1704 static int read_seek2(AVFormatContext *s,
1713 int64_t ts_ret, ts_adj;
1714 int stream_index_gen_search;
1716 AVParserState *backup;
1718 backup = ff_store_parser_state(s);
1720 // detect direction of seeking for search purposes
1721 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1722 AVSEEK_FLAG_BACKWARD : 0;
1724 if (flags & AVSEEK_FLAG_BYTE) {
1725 // use position directly, we will search starting from it
1728 // search for some position with good timestamp match
1729 if (stream_index < 0) {
1730 stream_index_gen_search = av_find_default_stream_index(s);
1731 if (stream_index_gen_search < 0) {
1732 ff_restore_parser_state(s, backup);
1736 st = s->streams[stream_index_gen_search];
1737 // timestamp for default must be expressed in AV_TIME_BASE units
1738 ts_adj = av_rescale(target_ts,
1740 AV_TIME_BASE * (int64_t)st->time_base.num);
1743 stream_index_gen_search = stream_index;
1745 pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1749 flags, &ts_ret, mpegts_get_pcr);
1751 ff_restore_parser_state(s, backup);
1756 // search for actual matching keyframe/starting position for all streams
1757 if (ff_gen_syncpoint_search(s, stream_index, pos,
1758 min_ts, target_ts, max_ts,
1760 ff_restore_parser_state(s, backup);
1764 ff_free_parser_state(s, backup);
1768 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1771 if (flags & AVSEEK_FLAG_BACKWARD) {
1772 flags &= ~AVSEEK_FLAG_BACKWARD;
1773 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1775 // for compatibility reasons, seek to the best-fitting timestamp
1776 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1778 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1780 // for compatibility reasons, seek to the best-fitting timestamp
1781 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1788 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1789 MpegTSContext *ts = s->priv_data;
1790 uint8_t buf[TS_PACKET_SIZE];
1793 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1796 pos= avio_tell(s->pb);
1799 avio_seek(s->pb, pos, SEEK_SET);
1800 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1802 // pid = AV_RB16(buf + 1) & 0x1fff;
1803 if(buf[1] & 0x40) break;
1804 pos += ts->raw_packet_size;
1806 avio_seek(s->pb, pos, SEEK_SET);
1813 /**************************************************************/
1814 /* parsing functions - called from other demuxers such as RTP */
1816 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1820 ts = av_mallocz(sizeof(MpegTSContext));
1823 /* no stream case, currently used by RTP */
1824 ts->raw_packet_size = TS_PACKET_SIZE;
1830 /* return the consumed length if a packet was output, or -1 if no
1832 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1833 const uint8_t *buf, int len)
1841 if (ts->stop_parse>0)
1843 if (len < TS_PACKET_SIZE)
1845 if (buf[0] != 0x47) {
1849 handle_packet(ts, buf);
1850 buf += TS_PACKET_SIZE;
1851 len -= TS_PACKET_SIZE;
1857 void ff_mpegts_parse_close(MpegTSContext *ts)
1861 for(i=0;i<NB_PID_MAX;i++)
1862 av_free(ts->pids[i]);
1866 AVInputFormat ff_mpegts_demuxer = {
1868 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1869 sizeof(MpegTSContext),
1876 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1877 #ifdef USE_SYNCPOINT_SEARCH
1878 .read_seek2 = read_seek2,
1882 AVInputFormat ff_mpegtsraw_demuxer = {
1884 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1885 sizeof(MpegTSContext),
1888 mpegts_raw_read_packet,
1892 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1893 #ifdef USE_SYNCPOINT_SEARCH
1894 .read_seek2 = read_seek2,
1896 .priv_class = &mpegtsraw_class,