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
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 */
167 int flags; /**< copied to the AVPacket flags */
170 int extended_stream_id;
172 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
173 uint8_t header[MAX_PES_HEADER_SIZE];
177 extern AVInputFormat ff_mpegts_demuxer;
179 static void clear_program(MpegTSContext *ts, unsigned int programid)
183 for(i=0; i<ts->nb_prg; i++)
184 if(ts->prg[i].id == programid)
185 ts->prg[i].nb_pids = 0;
188 static void clear_programs(MpegTSContext *ts)
194 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
197 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
201 p = &ts->prg[ts->nb_prg];
207 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
210 struct Program *p = NULL;
211 for(i=0; i<ts->nb_prg; i++) {
212 if(ts->prg[i].id == programid) {
220 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
222 p->pids[p->nb_pids++] = pid;
225 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
228 for(i=0; i<s->nb_programs; i++) {
229 if(s->programs[i]->id == programid) {
230 s->programs[i]->pcr_pid = pid;
237 * @brief discard_pid() decides if the pid is to be discarded according
238 * to caller's programs selection
239 * @param ts : - TS context
241 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
244 static int discard_pid(MpegTSContext *ts, unsigned int pid)
247 int used = 0, discarded = 0;
249 for(i=0; i<ts->nb_prg; i++) {
251 for(j=0; j<p->nb_pids; j++) {
252 if(p->pids[j] != pid)
254 //is program with id p->id set to be discarded?
255 for(k=0; k<ts->stream->nb_programs; k++) {
256 if(ts->stream->programs[k]->id == p->id) {
257 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
266 return !used && discarded;
270 * Assemble PES packets out of TS packets, and then call the "section_cb"
271 * function when they are complete.
273 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
274 const uint8_t *buf, int buf_size, int is_start)
276 MpegTSSectionFilter *tss = &tss1->u.section_filter;
280 memcpy(tss->section_buf, buf, buf_size);
281 tss->section_index = buf_size;
282 tss->section_h_size = -1;
283 tss->end_of_section_reached = 0;
285 if (tss->end_of_section_reached)
287 len = 4096 - tss->section_index;
290 memcpy(tss->section_buf + tss->section_index, buf, len);
291 tss->section_index += len;
294 /* compute section length if possible */
295 if (tss->section_h_size == -1 && tss->section_index >= 3) {
296 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
299 tss->section_h_size = len;
302 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
303 tss->end_of_section_reached = 1;
304 if (!tss->check_crc ||
305 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
306 tss->section_buf, tss->section_h_size) == 0)
307 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
311 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
312 SectionCallback *section_cb, void *opaque,
316 MpegTSFilter *filter;
317 MpegTSSectionFilter *sec;
319 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
321 if (pid >= NB_PID_MAX || ts->pids[pid])
323 filter = av_mallocz(sizeof(MpegTSFilter));
326 ts->pids[pid] = filter;
327 filter->type = MPEGTS_SECTION;
329 filter->last_cc = -1;
330 sec = &filter->u.section_filter;
331 sec->section_cb = section_cb;
332 sec->opaque = opaque;
333 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
334 sec->check_crc = check_crc;
335 if (!sec->section_buf) {
342 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
346 MpegTSFilter *filter;
347 MpegTSPESFilter *pes;
349 if (pid >= NB_PID_MAX || ts->pids[pid])
351 filter = av_mallocz(sizeof(MpegTSFilter));
354 ts->pids[pid] = filter;
355 filter->type = MPEGTS_PES;
357 filter->last_cc = -1;
358 pes = &filter->u.pes_filter;
359 pes->pes_cb = pes_cb;
360 pes->opaque = opaque;
364 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
369 if (filter->type == MPEGTS_SECTION)
370 av_freep(&filter->u.section_filter.section_buf);
371 else if (filter->type == MPEGTS_PES) {
372 PESContext *pes = filter->u.pes_filter.opaque;
373 av_freep(&pes->buffer);
374 /* referenced private data will be freed later in
375 * av_close_input_stream */
376 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
377 av_freep(&filter->u.pes_filter.opaque);
382 ts->pids[pid] = NULL;
385 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
386 int stat[TS_MAX_PACKET_SIZE];
391 memset(stat, 0, packet_size*sizeof(int));
393 for(x=i=0; i<size-3; i++){
394 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
396 if(stat[x] > best_score){
403 if(x == packet_size) x= 0;
409 /* autodetect fec presence. Must have at least 1024 bytes */
410 static int get_packet_size(const uint8_t *buf, int size)
412 int score, fec_score, dvhs_score;
414 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
417 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
418 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
419 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
420 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
422 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
423 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
424 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
428 typedef struct SectionHeader {
433 uint8_t last_sec_num;
436 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
449 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
455 if ((p + 1) >= p_end)
463 /* read and allocate a DVB string preceeded by its length */
464 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
471 len = get8(&p, p_end);
474 if ((p + len) > p_end)
476 str = av_malloc(len + 1);
486 static int parse_section_header(SectionHeader *h,
487 const uint8_t **pp, const uint8_t *p_end)
491 val = get8(pp, p_end);
496 val = get16(pp, p_end);
500 val = get8(pp, p_end);
503 h->version = (val >> 1) & 0x1f;
504 val = get8(pp, p_end);
508 val = get8(pp, p_end);
511 h->last_sec_num = val;
516 uint32_t stream_type;
517 enum AVMediaType codec_type;
518 enum CodecID codec_id;
521 static const StreamType ISO_types[] = {
522 { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
523 { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
524 { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
525 { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
526 { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
527 { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
528 { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
529 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
530 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
531 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
535 static const StreamType HDMV_types[] = {
536 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
537 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
538 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
539 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
540 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
541 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
546 static const StreamType MISC_types[] = {
547 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
548 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
552 static const StreamType REGD_types[] = {
553 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
554 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
555 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
559 /* descriptor present */
560 static const StreamType DESC_types[] = {
561 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
562 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
563 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
564 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
565 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
569 static void mpegts_find_stream_type(AVStream *st,
570 uint32_t stream_type, const StreamType *types)
572 for (; types->stream_type; types++) {
573 if (stream_type == types->stream_type) {
574 st->codec->codec_type = types->codec_type;
575 st->codec->codec_id = types->codec_id;
576 st->request_probe = 0;
582 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
583 uint32_t stream_type, uint32_t prog_reg_desc)
585 av_set_pts_info(st, 33, 1, 90000);
587 st->codec->codec_type = AVMEDIA_TYPE_DATA;
588 st->codec->codec_id = CODEC_ID_NONE;
589 st->need_parsing = AVSTREAM_PARSE_FULL;
591 pes->stream_type = stream_type;
593 av_log(pes->stream, AV_LOG_DEBUG,
594 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
595 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
597 st->codec->codec_tag = pes->stream_type;
599 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
600 if (prog_reg_desc == AV_RL32("HDMV") &&
601 st->codec->codec_id == CODEC_ID_NONE) {
602 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
603 if (pes->stream_type == 0x83) {
604 // HDMV TrueHD streams also contain an AC3 coded version of the
605 // audio track - add a second stream for this
607 // priv_data cannot be shared between streams
608 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
610 return AVERROR(ENOMEM);
611 memcpy(sub_pes, pes, sizeof(*sub_pes));
613 sub_st = av_new_stream(pes->stream, pes->pid);
616 return AVERROR(ENOMEM);
619 av_set_pts_info(sub_st, 33, 1, 90000);
620 sub_st->priv_data = sub_pes;
621 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
622 sub_st->codec->codec_id = CODEC_ID_AC3;
623 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
624 sub_pes->sub_st = pes->sub_st = sub_st;
627 if (st->codec->codec_id == CODEC_ID_NONE)
628 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
633 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
637 pkt->destruct = av_destruct_packet;
638 pkt->data = pes->buffer;
639 pkt->size = pes->data_index;
641 if(pes->total_size != MAX_PES_PAYLOAD &&
642 pes->pes_header_size + pes->data_index != pes->total_size + 6) {
643 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
644 pes->flags |= AV_PKT_FLAG_CORRUPT;
646 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
648 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
649 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
650 pkt->stream_index = pes->sub_st->index;
652 pkt->stream_index = pes->st->index;
655 /* store position of first TS packet of this PES packet */
656 pkt->pos = pes->ts_packet_pos;
657 pkt->flags = pes->flags;
659 /* reset pts values */
660 pes->pts = AV_NOPTS_VALUE;
661 pes->dts = AV_NOPTS_VALUE;
667 /* return non zero if a packet could be constructed */
668 static int mpegts_push_data(MpegTSFilter *filter,
669 const uint8_t *buf, int buf_size, int is_start,
672 PESContext *pes = filter->u.pes_filter.opaque;
673 MpegTSContext *ts = pes->ts;
681 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
682 new_pes_packet(pes, ts->pkt);
685 pes->state = MPEGTS_HEADER;
687 pes->ts_packet_pos = pos;
690 while (buf_size > 0) {
693 len = PES_START_SIZE - pes->data_index;
696 memcpy(pes->header + pes->data_index, p, len);
697 pes->data_index += len;
700 if (pes->data_index == PES_START_SIZE) {
701 /* we got all the PES or section header. We can now
703 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
704 pes->header[2] == 0x01) {
705 /* it must be an mpeg2 PES stream */
706 code = pes->header[3] | 0x100;
707 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
709 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
710 code == 0x1be) /* padding_stream */
713 /* stream not present in PMT */
715 pes->st = av_new_stream(ts->stream, pes->pid);
717 return AVERROR(ENOMEM);
718 mpegts_set_stream_info(pes->st, pes, 0, 0);
721 pes->total_size = AV_RB16(pes->header + 4);
722 /* NOTE: a zero total size means the PES size is
724 if (!pes->total_size)
725 pes->total_size = MAX_PES_PAYLOAD;
727 /* allocate pes buffer */
728 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
730 return AVERROR(ENOMEM);
732 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
733 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
734 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
735 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
736 pes->state = MPEGTS_PESHEADER;
737 if (pes->st->codec->codec_id == CODEC_ID_NONE && !pes->st->request_probe) {
738 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
739 pes->pid, pes->stream_type);
740 pes->st->request_probe= 1;
743 pes->state = MPEGTS_PAYLOAD;
747 /* otherwise, it should be a table */
750 pes->state = MPEGTS_SKIP;
755 /**********************************************/
756 /* PES packing parsing */
757 case MPEGTS_PESHEADER:
758 len = PES_HEADER_SIZE - pes->data_index;
763 memcpy(pes->header + pes->data_index, p, len);
764 pes->data_index += len;
767 if (pes->data_index == PES_HEADER_SIZE) {
768 pes->pes_header_size = pes->header[8] + 9;
769 pes->state = MPEGTS_PESHEADER_FILL;
772 case MPEGTS_PESHEADER_FILL:
773 len = pes->pes_header_size - pes->data_index;
778 memcpy(pes->header + pes->data_index, p, len);
779 pes->data_index += len;
782 if (pes->data_index == pes->pes_header_size) {
784 unsigned int flags, pes_ext, skip;
786 flags = pes->header[7];
788 pes->pts = AV_NOPTS_VALUE;
789 pes->dts = AV_NOPTS_VALUE;
790 if ((flags & 0xc0) == 0x80) {
791 pes->dts = pes->pts = ff_parse_pes_pts(r);
793 } else if ((flags & 0xc0) == 0xc0) {
794 pes->pts = ff_parse_pes_pts(r);
796 pes->dts = ff_parse_pes_pts(r);
799 pes->extended_stream_id = -1;
800 if (flags & 0x01) { /* PES extension */
802 /* Skip PES private data, program packet sequence counter and P-STD buffer */
803 skip = (pes_ext >> 4) & 0xb;
806 if ((pes_ext & 0x41) == 0x01 &&
807 (r + 2) <= (pes->header + pes->pes_header_size)) {
808 /* PES extension 2 */
809 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
810 pes->extended_stream_id = r[1];
814 /* we got the full header. We parse it and get the payload */
815 pes->state = MPEGTS_PAYLOAD;
820 if (buf_size > 0 && pes->buffer) {
821 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
822 new_pes_packet(pes, ts->pkt);
823 pes->total_size = MAX_PES_PAYLOAD;
824 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
826 return AVERROR(ENOMEM);
828 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
829 // pes packet size is < ts size packet and pes data is padded with 0xff
830 // not sure if this is legal in ts but see issue #2392
831 buf_size = pes->total_size;
833 memcpy(pes->buffer+pes->data_index, p, buf_size);
834 pes->data_index += buf_size;
837 /* emit complete packets with known packet size
838 * decreases demuxer delay for infrequent packets like subtitles from
839 * a couple of seconds to milliseconds for properly muxed files.
840 * total_size is the number of bytes following pes_packet_length
841 * in the pes header, i.e. not counting the first 6 bytes */
842 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
843 pes->pes_header_size + pes->data_index == pes->total_size + 6) {
845 new_pes_packet(pes, ts->pkt);
857 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
862 /* if no pid found, then add a pid context */
863 pes = av_mallocz(sizeof(PESContext));
867 pes->stream = ts->stream;
869 pes->pcr_pid = pcr_pid;
870 pes->state = MPEGTS_SKIP;
871 pes->pts = AV_NOPTS_VALUE;
872 pes->dts = AV_NOPTS_VALUE;
873 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
881 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
882 int *es_id, uint8_t **dec_config_descr,
883 int *dec_config_descr_size)
889 ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
891 len = ff_mp4_read_descr(s, &pb, &tag);
892 if (tag == MP4IODescrTag) {
893 avio_rb16(&pb); // ID
899 len = ff_mp4_read_descr(s, &pb, &tag);
900 if (tag == MP4ESDescrTag) {
901 *es_id = avio_rb16(&pb); /* ES_ID */
902 av_dlog(s, "ES_ID %#x\n", *es_id);
903 avio_r8(&pb); /* priority */
904 len = ff_mp4_read_descr(s, &pb, &tag);
905 if (tag == MP4DecConfigDescrTag) {
906 *dec_config_descr = av_malloc(len);
907 if (!*dec_config_descr)
908 return AVERROR(ENOMEM);
909 *dec_config_descr_size = len;
910 avio_read(&pb, *dec_config_descr, len);
917 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
918 const uint8_t **pp, const uint8_t *desc_list_end,
919 int mp4_dec_config_descr_len, int mp4_es_id, int pid,
920 uint8_t *mp4_dec_config_descr)
922 const uint8_t *desc_end;
923 int desc_len, desc_tag;
927 desc_tag = get8(pp, desc_list_end);
930 desc_len = get8(pp, desc_list_end);
933 desc_end = *pp + desc_len;
934 if (desc_end > desc_list_end)
937 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
939 if (st->codec->codec_id == CODEC_ID_NONE &&
940 stream_type == STREAM_TYPE_PRIVATE_DATA)
941 mpegts_find_stream_type(st, desc_tag, DESC_types);
944 case 0x1F: /* FMC descriptor */
946 if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
947 mp4_dec_config_descr_len && mp4_es_id == pid) {
949 ffio_init_context(&pb, mp4_dec_config_descr,
950 mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
951 ff_mp4_read_dec_config_descr(fc, st, &pb);
952 if (st->codec->codec_id == CODEC_ID_AAC &&
953 st->codec->extradata_size > 0)
954 st->need_parsing = 0;
957 case 0x56: /* DVB teletext descriptor */
958 language[0] = get8(pp, desc_end);
959 language[1] = get8(pp, desc_end);
960 language[2] = get8(pp, desc_end);
962 av_dict_set(&st->metadata, "language", language, 0);
964 case 0x59: /* subtitling descriptor */
965 language[0] = get8(pp, desc_end);
966 language[1] = get8(pp, desc_end);
967 language[2] = get8(pp, desc_end);
969 /* hearing impaired subtitles detection */
970 switch(get8(pp, desc_end)) {
971 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
972 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
973 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
974 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
975 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
976 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
977 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
980 if (st->codec->extradata) {
981 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
982 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
984 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
985 if (st->codec->extradata) {
986 st->codec->extradata_size = 4;
987 memcpy(st->codec->extradata, *pp, 4);
991 av_dict_set(&st->metadata, "language", language, 0);
993 case 0x0a: /* ISO 639 language descriptor */
994 for (i = 0; i + 4 <= desc_len; i += 4) {
995 language[i + 0] = get8(pp, desc_end);
996 language[i + 1] = get8(pp, desc_end);
997 language[i + 2] = get8(pp, desc_end);
998 language[i + 3] = ',';
999 switch (get8(pp, desc_end)) {
1000 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1001 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1002 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1006 language[i - 1] = 0;
1007 av_dict_set(&st->metadata, "language", language, 0);
1010 case 0x05: /* registration descriptor */
1011 st->codec->codec_tag = bytestream_get_le32(pp);
1012 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1013 if (st->codec->codec_id == CODEC_ID_NONE &&
1014 stream_type == STREAM_TYPE_PRIVATE_DATA)
1015 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1017 case 0x52: /* stream identifier descriptor */
1018 st->stream_identifier = 1 + get8(pp, desc_end);
1027 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1029 MpegTSContext *ts = filter->u.section_filter.opaque;
1030 SectionHeader h1, *h = &h1;
1033 const uint8_t *p, *p_end, *desc_list_end;
1034 int program_info_length, pcr_pid, pid, stream_type;
1036 uint32_t prog_reg_desc = 0; /* registration descriptor */
1037 uint8_t *mp4_dec_config_descr = NULL;
1038 int mp4_dec_config_descr_len = 0;
1041 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1042 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1044 p_end = section + section_len - 4;
1046 if (parse_section_header(h, &p, p_end) < 0)
1049 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1050 h->id, h->sec_num, h->last_sec_num);
1052 if (h->tid != PMT_TID)
1055 clear_program(ts, h->id);
1056 pcr_pid = get16(&p, p_end) & 0x1fff;
1059 add_pid_to_pmt(ts, h->id, pcr_pid);
1060 set_pcr_pid(ts->stream, h->id, pcr_pid);
1062 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1064 program_info_length = get16(&p, p_end) & 0xfff;
1065 if (program_info_length < 0)
1067 while(program_info_length >= 2) {
1069 tag = get8(&p, p_end);
1070 len = get8(&p, p_end);
1072 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1074 if(len > program_info_length - 2)
1075 //something else is broken, exit the program_descriptors_loop
1077 program_info_length -= len + 2;
1078 if (tag == 0x1d) { // IOD descriptor
1079 get8(&p, p_end); // scope
1080 get8(&p, p_end); // label
1082 mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1083 &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1084 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1085 prog_reg_desc = bytestream_get_le32(&p);
1090 p += program_info_length;
1094 // stop parsing after pmt, we found header
1095 if (!ts->stream->nb_streams)
1100 stream_type = get8(&p, p_end);
1101 if (stream_type < 0)
1103 pid = get16(&p, p_end) & 0x1fff;
1107 /* now create ffmpeg stream */
1108 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1109 pes = ts->pids[pid]->u.pes_filter.opaque;
1111 pes->st = av_new_stream(pes->stream, pes->pid);
1114 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1115 pes = add_pes_stream(ts, pid, pcr_pid);
1117 st = av_new_stream(pes->stream, pes->pid);
1123 if (!pes->stream_type)
1124 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1126 add_pid_to_pmt(ts, h->id, pid);
1128 ff_program_add_stream_index(ts->stream, h->id, st->index);
1130 desc_list_len = get16(&p, p_end) & 0xfff;
1131 if (desc_list_len < 0)
1133 desc_list_end = p + desc_list_len;
1134 if (desc_list_end > p_end)
1137 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1138 mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1141 if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1142 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1143 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1150 av_free(mp4_dec_config_descr);
1153 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1155 MpegTSContext *ts = filter->u.section_filter.opaque;
1156 SectionHeader h1, *h = &h1;
1157 const uint8_t *p, *p_end;
1161 av_dlog(ts->stream, "PAT:\n");
1162 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1164 p_end = section + section_len - 4;
1166 if (parse_section_header(h, &p, p_end) < 0)
1168 if (h->tid != PAT_TID)
1171 ts->stream->ts_id = h->id;
1175 sid = get16(&p, p_end);
1178 pmt_pid = get16(&p, p_end) & 0x1fff;
1182 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1184 if (sid == 0x0000) {
1187 program = av_new_program(ts->stream, sid);
1188 program->program_num = sid;
1189 program->pmt_pid = pmt_pid;
1190 if (ts->pids[pmt_pid])
1191 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1192 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1193 add_pat_entry(ts, sid);
1194 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1195 add_pid_to_pmt(ts, sid, pmt_pid);
1200 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1202 MpegTSContext *ts = filter->u.section_filter.opaque;
1203 SectionHeader h1, *h = &h1;
1204 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1205 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1206 char *name, *provider_name;
1208 av_dlog(ts->stream, "SDT:\n");
1209 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1211 p_end = section + section_len - 4;
1213 if (parse_section_header(h, &p, p_end) < 0)
1215 if (h->tid != SDT_TID)
1217 onid = get16(&p, p_end);
1220 val = get8(&p, p_end);
1224 sid = get16(&p, p_end);
1227 val = get8(&p, p_end);
1230 desc_list_len = get16(&p, p_end) & 0xfff;
1231 if (desc_list_len < 0)
1233 desc_list_end = p + desc_list_len;
1234 if (desc_list_end > p_end)
1237 desc_tag = get8(&p, desc_list_end);
1240 desc_len = get8(&p, desc_list_end);
1241 desc_end = p + desc_len;
1242 if (desc_end > desc_list_end)
1245 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1246 desc_tag, desc_len);
1250 service_type = get8(&p, p_end);
1251 if (service_type < 0)
1253 provider_name = getstr8(&p, p_end);
1256 name = getstr8(&p, p_end);
1258 AVProgram *program = av_new_program(ts->stream, sid);
1260 av_dict_set(&program->metadata, "service_name", name, 0);
1261 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1265 av_free(provider_name);
1276 /* handle one TS packet */
1277 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1279 AVFormatContext *s = ts->stream;
1281 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1282 has_adaptation, has_payload;
1283 const uint8_t *p, *p_end;
1286 pid = AV_RB16(packet + 1) & 0x1fff;
1287 if(pid && discard_pid(ts, pid))
1289 is_start = packet[1] & 0x40;
1290 tss = ts->pids[pid];
1291 if (ts->auto_guess && tss == NULL && is_start) {
1292 add_pes_stream(ts, pid, -1);
1293 tss = ts->pids[pid];
1298 afc = (packet[3] >> 4) & 3;
1299 if (afc == 0) /* reserved value */
1301 has_adaptation = afc & 2;
1302 has_payload = afc & 1;
1303 is_discontinuity = has_adaptation
1304 && packet[4] != 0 /* with length > 0 */
1305 && (packet[5] & 0x80); /* and discontinuity indicated */
1307 /* continuity check (currently not used) */
1308 cc = (packet[3] & 0xf);
1309 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1310 cc_ok = pid == 0x1FFF // null packet PID
1313 || expected_cc == cc;
1317 av_log(ts->stream, AV_LOG_WARNING, "Continuity Check Failed\n");
1318 if(tss->type == MPEGTS_PES) {
1319 PESContext *pc = tss->u.pes_filter.opaque;
1320 pc->flags |= AV_PKT_FLAG_CORRUPT;
1327 if (has_adaptation) {
1328 /* skip adapation field */
1331 /* if past the end of packet, ignore */
1332 p_end = packet + TS_PACKET_SIZE;
1336 pos = avio_tell(ts->stream->pb);
1337 ts->pos47= pos % ts->raw_packet_size;
1339 if (tss->type == MPEGTS_SECTION) {
1341 /* pointer field present */
1343 if (p + len > p_end)
1346 /* write remaining section bytes */
1347 write_section_data(s, tss,
1349 /* check whether filter has been closed */
1355 write_section_data(s, tss,
1360 write_section_data(s, tss,
1366 // Note: The position here points actually behind the current packet.
1367 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1368 pos - ts->raw_packet_size)) < 0)
1375 /* XXX: try to find a better synchro over several packets (use
1376 get_packet_size() ?) */
1377 static int mpegts_resync(AVFormatContext *s)
1379 AVIOContext *pb = s->pb;
1382 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1387 avio_seek(pb, -1, SEEK_CUR);
1391 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1396 /* return -1 if error or EOF. Return 0 if OK. */
1397 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1399 AVIOContext *pb = s->pb;
1403 len = avio_read(pb, buf, TS_PACKET_SIZE);
1404 if (len != TS_PACKET_SIZE)
1405 return len < 0 ? len : AVERROR_EOF;
1406 /* check paquet sync byte */
1407 if (buf[0] != 0x47) {
1408 /* find a new packet start */
1409 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1410 if (mpegts_resync(s) < 0)
1411 return AVERROR(EAGAIN);
1415 skip = raw_packet_size - TS_PACKET_SIZE;
1417 avio_skip(pb, skip);
1424 static int handle_packets(MpegTSContext *ts, int nb_packets)
1426 AVFormatContext *s = ts->stream;
1427 uint8_t packet[TS_PACKET_SIZE];
1428 int packet_num, ret = 0;
1430 if (avio_tell(s->pb) != ts->last_pos) {
1432 // av_dlog("Skipping after seek\n");
1433 /* seek detected, flush pes buffer */
1434 for (i = 0; i < NB_PID_MAX; i++) {
1435 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1436 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1437 av_freep(&pes->buffer);
1438 ts->pids[i]->last_cc = -1;
1439 pes->data_index = 0;
1440 pes->state = MPEGTS_SKIP; /* skip until pes header */
1448 if (ts->stop_parse>0)
1451 if (nb_packets != 0 && packet_num >= nb_packets)
1453 ret = read_packet(s, packet, ts->raw_packet_size);
1456 ret = handle_packet(ts, packet);
1460 ts->last_pos = avio_tell(s->pb);
1464 static int mpegts_probe(AVProbeData *p)
1467 const int size= p->buf_size;
1468 int score, fec_score, dvhs_score;
1469 int check_count= size / TS_FEC_PACKET_SIZE;
1470 #define CHECK_COUNT 10
1472 if (check_count < CHECK_COUNT)
1475 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1476 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1477 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1478 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1480 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1481 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1482 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1483 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1486 /* only use the extension for safer guess */
1487 if (av_match_ext(p->filename, "ts"))
1488 return AVPROBE_SCORE_MAX;
1494 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1495 (-1) if not available */
1496 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1497 const uint8_t *packet)
1499 int afc, len, flags;
1503 afc = (packet[3] >> 4) & 3;
1513 if (!(flags & 0x10))
1518 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1519 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1523 static int mpegts_read_header(AVFormatContext *s,
1524 AVFormatParameters *ap)
1526 MpegTSContext *ts = s->priv_data;
1527 AVIOContext *pb = s->pb;
1528 uint8_t buf[8*1024];
1532 #if FF_API_FORMAT_PARAMETERS
1534 if (ap->mpeg2ts_compute_pcr)
1535 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1539 /* read the first 1024 bytes to get packet size */
1540 pos = avio_tell(pb);
1541 len = avio_read(pb, buf, sizeof(buf));
1542 if (len != sizeof(buf))
1544 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1545 if (ts->raw_packet_size <= 0) {
1546 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1547 ts->raw_packet_size = TS_PACKET_SIZE;
1552 if (s->iformat == &ff_mpegts_demuxer) {
1555 /* first do a scaning to get all the services */
1556 if (pb->seekable && avio_seek(pb, pos, SEEK_SET) < 0)
1557 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1559 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1561 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1563 handle_packets(ts, s->probesize / ts->raw_packet_size);
1564 /* if could not find service, enable auto_guess */
1568 av_dlog(ts->stream, "tuning done\n");
1570 s->ctx_flags |= AVFMTCTX_NOHEADER;
1573 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1574 int64_t pcrs[2], pcr_h;
1575 int packet_count[2];
1576 uint8_t packet[TS_PACKET_SIZE];
1578 /* only read packets */
1580 st = av_new_stream(s, 0);
1583 av_set_pts_info(st, 60, 1, 27000000);
1584 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1585 st->codec->codec_id = CODEC_ID_MPEG2TS;
1587 /* we iterate until we find two PCRs to estimate the bitrate */
1592 ret = read_packet(s, packet, ts->raw_packet_size);
1595 pid = AV_RB16(packet + 1) & 0x1fff;
1596 if ((pcr_pid == -1 || pcr_pid == pid) &&
1597 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1599 packet_count[nb_pcrs] = nb_packets;
1600 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1608 /* NOTE1: the bitrate is computed without the FEC */
1609 /* NOTE2: it is only the bitrate of the start of the stream */
1610 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1611 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1612 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1613 st->codec->bit_rate = s->bit_rate;
1614 st->start_time = ts->cur_pcr;
1615 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1616 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1619 avio_seek(pb, pos, SEEK_SET);
1625 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1627 static int mpegts_raw_read_packet(AVFormatContext *s,
1630 MpegTSContext *ts = s->priv_data;
1632 int64_t pcr_h, next_pcr_h, pos;
1633 int pcr_l, next_pcr_l;
1634 uint8_t pcr_buf[12];
1636 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1637 return AVERROR(ENOMEM);
1638 pkt->pos= avio_tell(s->pb);
1639 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1641 av_free_packet(pkt);
1644 if (ts->mpeg2ts_compute_pcr) {
1645 /* compute exact PCR for each packet */
1646 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1647 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1648 pos = avio_tell(s->pb);
1649 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1650 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1651 avio_read(s->pb, pcr_buf, 12);
1652 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1653 /* XXX: not precise enough */
1654 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1659 avio_seek(s->pb, pos, SEEK_SET);
1660 /* no next PCR found: we use previous increment */
1661 ts->cur_pcr = pcr_h * 300 + pcr_l;
1663 pkt->pts = ts->cur_pcr;
1664 pkt->duration = ts->pcr_incr;
1665 ts->cur_pcr += ts->pcr_incr;
1667 pkt->stream_index = 0;
1671 static int mpegts_read_packet(AVFormatContext *s,
1674 MpegTSContext *ts = s->priv_data;
1678 ret = handle_packets(ts, 0);
1680 /* flush pes data left */
1681 for (i = 0; i < NB_PID_MAX; i++) {
1682 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1683 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1684 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1685 new_pes_packet(pes, pkt);
1686 pes->state = MPEGTS_SKIP;
1697 static int mpegts_read_close(AVFormatContext *s)
1699 MpegTSContext *ts = s->priv_data;
1704 for(i=0;i<NB_PID_MAX;i++)
1705 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1710 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1711 int64_t *ppos, int64_t pos_limit)
1713 MpegTSContext *ts = s->priv_data;
1714 int64_t pos, timestamp;
1715 uint8_t buf[TS_PACKET_SIZE];
1716 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1717 const int find_next= 1;
1718 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1721 avio_seek(s->pb, pos, SEEK_SET);
1722 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1723 return AV_NOPTS_VALUE;
1724 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1725 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1728 pos += ts->raw_packet_size;
1732 pos -= ts->raw_packet_size;
1734 return AV_NOPTS_VALUE;
1735 avio_seek(s->pb, pos, SEEK_SET);
1736 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1737 return AV_NOPTS_VALUE;
1738 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1739 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1749 #ifdef USE_SYNCPOINT_SEARCH
1751 static int read_seek2(AVFormatContext *s,
1760 int64_t ts_ret, ts_adj;
1761 int stream_index_gen_search;
1763 AVParserState *backup;
1765 backup = ff_store_parser_state(s);
1767 // detect direction of seeking for search purposes
1768 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1769 AVSEEK_FLAG_BACKWARD : 0;
1771 if (flags & AVSEEK_FLAG_BYTE) {
1772 // use position directly, we will search starting from it
1775 // search for some position with good timestamp match
1776 if (stream_index < 0) {
1777 stream_index_gen_search = av_find_default_stream_index(s);
1778 if (stream_index_gen_search < 0) {
1779 ff_restore_parser_state(s, backup);
1783 st = s->streams[stream_index_gen_search];
1784 // timestamp for default must be expressed in AV_TIME_BASE units
1785 ts_adj = av_rescale(target_ts,
1787 AV_TIME_BASE * (int64_t)st->time_base.num);
1790 stream_index_gen_search = stream_index;
1792 pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1796 flags, &ts_ret, mpegts_get_pcr);
1798 ff_restore_parser_state(s, backup);
1803 // search for actual matching keyframe/starting position for all streams
1804 if (ff_gen_syncpoint_search(s, stream_index, pos,
1805 min_ts, target_ts, max_ts,
1807 ff_restore_parser_state(s, backup);
1811 ff_free_parser_state(s, backup);
1815 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1818 if (flags & AVSEEK_FLAG_BACKWARD) {
1819 flags &= ~AVSEEK_FLAG_BACKWARD;
1820 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1822 // for compatibility reasons, seek to the best-fitting timestamp
1823 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1825 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1827 // for compatibility reasons, seek to the best-fitting timestamp
1828 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1835 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1836 MpegTSContext *ts = s->priv_data;
1837 uint8_t buf[TS_PACKET_SIZE];
1840 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1843 pos= avio_tell(s->pb);
1846 avio_seek(s->pb, pos, SEEK_SET);
1847 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1849 // pid = AV_RB16(buf + 1) & 0x1fff;
1850 if(buf[1] & 0x40) break;
1851 pos += ts->raw_packet_size;
1853 avio_seek(s->pb, pos, SEEK_SET);
1860 /**************************************************************/
1861 /* parsing functions - called from other demuxers such as RTP */
1863 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1867 ts = av_mallocz(sizeof(MpegTSContext));
1870 /* no stream case, currently used by RTP */
1871 ts->raw_packet_size = TS_PACKET_SIZE;
1877 /* return the consumed length if a packet was output, or -1 if no
1879 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1880 const uint8_t *buf, int len)
1888 if (ts->stop_parse>0)
1890 if (len < TS_PACKET_SIZE)
1892 if (buf[0] != 0x47) {
1896 handle_packet(ts, buf);
1897 buf += TS_PACKET_SIZE;
1898 len -= TS_PACKET_SIZE;
1904 void ff_mpegts_parse_close(MpegTSContext *ts)
1908 for(i=0;i<NB_PID_MAX;i++)
1909 av_free(ts->pids[i]);
1913 AVInputFormat ff_mpegts_demuxer = {
1915 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1916 .priv_data_size = sizeof(MpegTSContext),
1917 .read_probe = mpegts_probe,
1918 .read_header = mpegts_read_header,
1919 .read_packet = mpegts_read_packet,
1920 .read_close = mpegts_read_close,
1921 .read_seek = read_seek,
1922 .read_timestamp = mpegts_get_pcr,
1923 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1924 #ifdef USE_SYNCPOINT_SEARCH
1925 .read_seek2 = read_seek2,
1929 AVInputFormat ff_mpegtsraw_demuxer = {
1930 .name = "mpegtsraw",
1931 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1932 .priv_data_size = sizeof(MpegTSContext),
1933 .read_header = mpegts_read_header,
1934 .read_packet = mpegts_raw_read_packet,
1935 .read_close = mpegts_read_close,
1936 .read_seek = read_seek,
1937 .read_timestamp = mpegts_get_pcr,
1938 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1939 #ifdef USE_SYNCPOINT_SEARCH
1940 .read_seek2 = read_seek2,
1942 .priv_class = &mpegtsraw_class,