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 */
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;
224 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
227 for(i=0; i<s->nb_programs; i++) {
228 if(s->programs[i]->id == programid) {
229 s->programs[i]->pcr_pid = pid;
236 * @brief discard_pid() decides if the pid is to be discarded according
237 * to caller's programs selection
238 * @param ts : - TS context
240 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
243 static int discard_pid(MpegTSContext *ts, unsigned int pid)
246 int used = 0, discarded = 0;
248 for(i=0; i<ts->nb_prg; i++) {
250 for(j=0; j<p->nb_pids; j++) {
251 if(p->pids[j] != pid)
253 //is program with id p->id set to be discarded?
254 for(k=0; k<ts->stream->nb_programs; k++) {
255 if(ts->stream->programs[k]->id == p->id) {
256 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
265 return !used && discarded;
269 * Assemble PES packets out of TS packets, and then call the "section_cb"
270 * function when they are complete.
272 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
273 const uint8_t *buf, int buf_size, int is_start)
275 MpegTSSectionFilter *tss = &tss1->u.section_filter;
279 memcpy(tss->section_buf, buf, buf_size);
280 tss->section_index = buf_size;
281 tss->section_h_size = -1;
282 tss->end_of_section_reached = 0;
284 if (tss->end_of_section_reached)
286 len = 4096 - tss->section_index;
289 memcpy(tss->section_buf + tss->section_index, buf, len);
290 tss->section_index += len;
293 /* compute section length if possible */
294 if (tss->section_h_size == -1 && tss->section_index >= 3) {
295 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
298 tss->section_h_size = len;
301 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
302 tss->end_of_section_reached = 1;
303 if (!tss->check_crc ||
304 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
305 tss->section_buf, tss->section_h_size) == 0)
306 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
310 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
311 SectionCallback *section_cb, void *opaque,
315 MpegTSFilter *filter;
316 MpegTSSectionFilter *sec;
318 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
320 if (pid >= NB_PID_MAX || ts->pids[pid])
322 filter = av_mallocz(sizeof(MpegTSFilter));
325 ts->pids[pid] = filter;
326 filter->type = MPEGTS_SECTION;
328 filter->last_cc = -1;
329 sec = &filter->u.section_filter;
330 sec->section_cb = section_cb;
331 sec->opaque = opaque;
332 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
333 sec->check_crc = check_crc;
334 if (!sec->section_buf) {
341 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
345 MpegTSFilter *filter;
346 MpegTSPESFilter *pes;
348 if (pid >= NB_PID_MAX || ts->pids[pid])
350 filter = av_mallocz(sizeof(MpegTSFilter));
353 ts->pids[pid] = filter;
354 filter->type = MPEGTS_PES;
356 filter->last_cc = -1;
357 pes = &filter->u.pes_filter;
358 pes->pes_cb = pes_cb;
359 pes->opaque = opaque;
363 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
368 if (filter->type == MPEGTS_SECTION)
369 av_freep(&filter->u.section_filter.section_buf);
370 else if (filter->type == MPEGTS_PES) {
371 PESContext *pes = filter->u.pes_filter.opaque;
372 av_freep(&pes->buffer);
373 /* referenced private data will be freed later in
374 * av_close_input_stream */
375 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
376 av_freep(&filter->u.pes_filter.opaque);
381 ts->pids[pid] = NULL;
384 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
385 int stat[TS_MAX_PACKET_SIZE];
390 memset(stat, 0, packet_size*sizeof(int));
392 for(x=i=0; i<size-3; i++){
393 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
395 if(stat[x] > best_score){
402 if(x == packet_size) x= 0;
408 /* autodetect fec presence. Must have at least 1024 bytes */
409 static int get_packet_size(const uint8_t *buf, int size)
411 int score, fec_score, dvhs_score;
413 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
416 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
417 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
418 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
419 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
421 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
422 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
423 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
427 typedef struct SectionHeader {
432 uint8_t last_sec_num;
435 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
448 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
454 if ((p + 1) >= p_end)
462 /* read and allocate a DVB string preceeded by its length */
463 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
470 len = get8(&p, p_end);
473 if ((p + len) > p_end)
475 str = av_malloc(len + 1);
485 static int parse_section_header(SectionHeader *h,
486 const uint8_t **pp, const uint8_t *p_end)
490 val = get8(pp, p_end);
495 val = get16(pp, p_end);
499 val = get8(pp, p_end);
502 h->version = (val >> 1) & 0x1f;
503 val = get8(pp, p_end);
507 val = get8(pp, p_end);
510 h->last_sec_num = val;
515 uint32_t stream_type;
516 enum AVMediaType codec_type;
517 enum CodecID codec_id;
520 static const StreamType ISO_types[] = {
521 { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
522 { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
523 { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
524 { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
525 { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
526 { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
527 { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
528 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
529 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
530 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
534 static const StreamType HDMV_types[] = {
535 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
536 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
537 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
538 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
539 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
540 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
545 static const StreamType MISC_types[] = {
546 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
547 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
551 static const StreamType REGD_types[] = {
552 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
553 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
554 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
558 /* descriptor present */
559 static const StreamType DESC_types[] = {
560 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
561 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
562 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
563 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
564 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
568 static void mpegts_find_stream_type(AVStream *st,
569 uint32_t stream_type, const StreamType *types)
571 for (; types->stream_type; types++) {
572 if (stream_type == types->stream_type) {
573 st->codec->codec_type = types->codec_type;
574 st->codec->codec_id = types->codec_id;
575 st->request_probe = 0;
581 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
582 uint32_t stream_type, uint32_t prog_reg_desc)
584 av_set_pts_info(st, 33, 1, 90000);
586 st->codec->codec_type = AVMEDIA_TYPE_DATA;
587 st->codec->codec_id = CODEC_ID_NONE;
588 st->need_parsing = AVSTREAM_PARSE_FULL;
590 pes->stream_type = stream_type;
592 av_log(pes->stream, AV_LOG_DEBUG,
593 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
594 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
596 st->codec->codec_tag = pes->stream_type;
598 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
599 if (prog_reg_desc == AV_RL32("HDMV") &&
600 st->codec->codec_id == CODEC_ID_NONE) {
601 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
602 if (pes->stream_type == 0x83) {
603 // HDMV TrueHD streams also contain an AC3 coded version of the
604 // audio track - add a second stream for this
606 // priv_data cannot be shared between streams
607 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
609 return AVERROR(ENOMEM);
610 memcpy(sub_pes, pes, sizeof(*sub_pes));
612 sub_st = av_new_stream(pes->stream, pes->pid);
615 return AVERROR(ENOMEM);
618 av_set_pts_info(sub_st, 33, 1, 90000);
619 sub_st->priv_data = sub_pes;
620 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
621 sub_st->codec->codec_id = CODEC_ID_AC3;
622 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
623 sub_pes->sub_st = pes->sub_st = sub_st;
626 if (st->codec->codec_id == CODEC_ID_NONE)
627 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
632 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
636 pkt->destruct = av_destruct_packet;
637 pkt->data = pes->buffer;
638 pkt->size = pes->data_index;
639 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
641 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
642 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
643 pkt->stream_index = pes->sub_st->index;
645 pkt->stream_index = pes->st->index;
648 /* store position of first TS packet of this PES packet */
649 pkt->pos = pes->ts_packet_pos;
651 /* reset pts values */
652 pes->pts = AV_NOPTS_VALUE;
653 pes->dts = AV_NOPTS_VALUE;
658 /* return non zero if a packet could be constructed */
659 static int mpegts_push_data(MpegTSFilter *filter,
660 const uint8_t *buf, int buf_size, int is_start,
663 PESContext *pes = filter->u.pes_filter.opaque;
664 MpegTSContext *ts = pes->ts;
672 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
673 new_pes_packet(pes, ts->pkt);
676 pes->state = MPEGTS_HEADER;
678 pes->ts_packet_pos = pos;
681 while (buf_size > 0) {
684 len = PES_START_SIZE - pes->data_index;
687 memcpy(pes->header + pes->data_index, p, len);
688 pes->data_index += len;
691 if (pes->data_index == PES_START_SIZE) {
692 /* we got all the PES or section header. We can now
694 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
695 pes->header[2] == 0x01) {
696 /* it must be an mpeg2 PES stream */
697 code = pes->header[3] | 0x100;
698 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
700 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
701 code == 0x1be) /* padding_stream */
704 /* stream not present in PMT */
706 pes->st = av_new_stream(ts->stream, pes->pid);
708 return AVERROR(ENOMEM);
709 mpegts_set_stream_info(pes->st, pes, 0, 0);
712 pes->total_size = AV_RB16(pes->header + 4);
713 /* NOTE: a zero total size means the PES size is
715 if (!pes->total_size)
716 pes->total_size = MAX_PES_PAYLOAD;
718 /* allocate pes buffer */
719 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
721 return AVERROR(ENOMEM);
723 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
724 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
725 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
726 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
727 pes->state = MPEGTS_PESHEADER;
728 if (pes->st->codec->codec_id == CODEC_ID_NONE && !pes->st->request_probe) {
729 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
730 pes->pid, pes->stream_type);
731 pes->st->request_probe= 1;
734 pes->state = MPEGTS_PAYLOAD;
738 /* otherwise, it should be a table */
741 pes->state = MPEGTS_SKIP;
746 /**********************************************/
747 /* PES packing parsing */
748 case MPEGTS_PESHEADER:
749 len = PES_HEADER_SIZE - pes->data_index;
754 memcpy(pes->header + pes->data_index, p, len);
755 pes->data_index += len;
758 if (pes->data_index == PES_HEADER_SIZE) {
759 pes->pes_header_size = pes->header[8] + 9;
760 pes->state = MPEGTS_PESHEADER_FILL;
763 case MPEGTS_PESHEADER_FILL:
764 len = pes->pes_header_size - pes->data_index;
769 memcpy(pes->header + pes->data_index, p, len);
770 pes->data_index += len;
773 if (pes->data_index == pes->pes_header_size) {
775 unsigned int flags, pes_ext, skip;
777 flags = pes->header[7];
779 pes->pts = AV_NOPTS_VALUE;
780 pes->dts = AV_NOPTS_VALUE;
781 if ((flags & 0xc0) == 0x80) {
782 pes->dts = pes->pts = ff_parse_pes_pts(r);
784 } else if ((flags & 0xc0) == 0xc0) {
785 pes->pts = ff_parse_pes_pts(r);
787 pes->dts = ff_parse_pes_pts(r);
790 pes->extended_stream_id = -1;
791 if (flags & 0x01) { /* PES extension */
793 /* Skip PES private data, program packet sequence counter and P-STD buffer */
794 skip = (pes_ext >> 4) & 0xb;
797 if ((pes_ext & 0x41) == 0x01 &&
798 (r + 2) <= (pes->header + pes->pes_header_size)) {
799 /* PES extension 2 */
800 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
801 pes->extended_stream_id = r[1];
805 /* we got the full header. We parse it and get the payload */
806 pes->state = MPEGTS_PAYLOAD;
811 if (buf_size > 0 && pes->buffer) {
812 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
813 new_pes_packet(pes, ts->pkt);
814 pes->total_size = MAX_PES_PAYLOAD;
815 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
817 return AVERROR(ENOMEM);
819 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
820 // pes packet size is < ts size packet and pes data is padded with 0xff
821 // not sure if this is legal in ts but see issue #2392
822 buf_size = pes->total_size;
824 memcpy(pes->buffer+pes->data_index, p, buf_size);
825 pes->data_index += buf_size;
828 /* emit complete packets with known packet size
829 * decreases demuxer delay for infrequent packets like subtitles from
830 * a couple of seconds to milliseconds for properly muxed files.
831 * total_size is the number of bytes following pes_packet_length
832 * in the pes header, i.e. not counting the first 6 bytes */
833 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
834 pes->pes_header_size + pes->data_index == pes->total_size + 6) {
836 new_pes_packet(pes, ts->pkt);
848 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
853 /* if no pid found, then add a pid context */
854 pes = av_mallocz(sizeof(PESContext));
858 pes->stream = ts->stream;
860 pes->pcr_pid = pcr_pid;
861 pes->state = MPEGTS_SKIP;
862 pes->pts = AV_NOPTS_VALUE;
863 pes->dts = AV_NOPTS_VALUE;
864 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
872 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
873 int *es_id, uint8_t **dec_config_descr,
874 int *dec_config_descr_size)
880 ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
882 len = ff_mp4_read_descr(s, &pb, &tag);
883 if (tag == MP4IODescrTag) {
884 avio_rb16(&pb); // ID
890 len = ff_mp4_read_descr(s, &pb, &tag);
891 if (tag == MP4ESDescrTag) {
892 *es_id = avio_rb16(&pb); /* ES_ID */
893 av_dlog(s, "ES_ID %#x\n", *es_id);
894 avio_r8(&pb); /* priority */
895 len = ff_mp4_read_descr(s, &pb, &tag);
896 if (tag == MP4DecConfigDescrTag) {
897 *dec_config_descr = av_malloc(len);
898 if (!*dec_config_descr)
899 return AVERROR(ENOMEM);
900 *dec_config_descr_size = len;
901 avio_read(&pb, *dec_config_descr, len);
908 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
909 const uint8_t **pp, const uint8_t *desc_list_end,
910 int mp4_dec_config_descr_len, int mp4_es_id, int pid,
911 uint8_t *mp4_dec_config_descr)
913 const uint8_t *desc_end;
914 int desc_len, desc_tag;
918 desc_tag = get8(pp, desc_list_end);
921 desc_len = get8(pp, desc_list_end);
924 desc_end = *pp + desc_len;
925 if (desc_end > desc_list_end)
928 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
930 if (st->codec->codec_id == CODEC_ID_NONE &&
931 stream_type == STREAM_TYPE_PRIVATE_DATA)
932 mpegts_find_stream_type(st, desc_tag, DESC_types);
935 case 0x1F: /* FMC descriptor */
937 if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
938 mp4_dec_config_descr_len && mp4_es_id == pid) {
940 ffio_init_context(&pb, mp4_dec_config_descr,
941 mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
942 ff_mp4_read_dec_config_descr(fc, st, &pb);
943 if (st->codec->codec_id == CODEC_ID_AAC &&
944 st->codec->extradata_size > 0)
945 st->need_parsing = 0;
948 case 0x56: /* DVB teletext descriptor */
949 language[0] = get8(pp, desc_end);
950 language[1] = get8(pp, desc_end);
951 language[2] = get8(pp, desc_end);
953 av_dict_set(&st->metadata, "language", language, 0);
955 case 0x59: /* subtitling descriptor */
956 language[0] = get8(pp, desc_end);
957 language[1] = get8(pp, desc_end);
958 language[2] = get8(pp, desc_end);
960 /* hearing impaired subtitles detection */
961 switch(get8(pp, desc_end)) {
962 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
963 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
964 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
965 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
966 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
967 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
968 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
971 if (st->codec->extradata) {
972 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
973 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
975 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
976 if (st->codec->extradata) {
977 st->codec->extradata_size = 4;
978 memcpy(st->codec->extradata, *pp, 4);
982 av_dict_set(&st->metadata, "language", language, 0);
984 case 0x0a: /* ISO 639 language descriptor */
985 for (i = 0; i + 4 <= desc_len; i += 4) {
986 language[i + 0] = get8(pp, desc_end);
987 language[i + 1] = get8(pp, desc_end);
988 language[i + 2] = get8(pp, desc_end);
989 language[i + 3] = ',';
990 switch (get8(pp, desc_end)) {
991 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
992 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
993 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
998 av_dict_set(&st->metadata, "language", language, 0);
1001 case 0x05: /* registration descriptor */
1002 st->codec->codec_tag = bytestream_get_le32(pp);
1003 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1004 if (st->codec->codec_id == CODEC_ID_NONE &&
1005 stream_type == STREAM_TYPE_PRIVATE_DATA)
1006 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1008 case 0x52: /* stream identifier descriptor */
1009 st->stream_identifier = 1 + get8(pp, desc_end);
1018 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1020 MpegTSContext *ts = filter->u.section_filter.opaque;
1021 SectionHeader h1, *h = &h1;
1024 const uint8_t *p, *p_end, *desc_list_end;
1025 int program_info_length, pcr_pid, pid, stream_type;
1027 uint32_t prog_reg_desc = 0; /* registration descriptor */
1028 uint8_t *mp4_dec_config_descr = NULL;
1029 int mp4_dec_config_descr_len = 0;
1032 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1033 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1035 p_end = section + section_len - 4;
1037 if (parse_section_header(h, &p, p_end) < 0)
1040 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1041 h->id, h->sec_num, h->last_sec_num);
1043 if (h->tid != PMT_TID)
1046 clear_program(ts, h->id);
1047 pcr_pid = get16(&p, p_end) & 0x1fff;
1050 add_pid_to_pmt(ts, h->id, pcr_pid);
1051 set_pcr_pid(ts->stream, h->id, pcr_pid);
1053 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1055 program_info_length = get16(&p, p_end) & 0xfff;
1056 if (program_info_length < 0)
1058 while(program_info_length >= 2) {
1060 tag = get8(&p, p_end);
1061 len = get8(&p, p_end);
1063 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1065 if(len > program_info_length - 2)
1066 //something else is broken, exit the program_descriptors_loop
1068 program_info_length -= len + 2;
1069 if (tag == 0x1d) { // IOD descriptor
1070 get8(&p, p_end); // scope
1071 get8(&p, p_end); // label
1073 mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1074 &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1075 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1076 prog_reg_desc = bytestream_get_le32(&p);
1081 p += program_info_length;
1085 // stop parsing after pmt, we found header
1086 if (!ts->stream->nb_streams)
1091 stream_type = get8(&p, p_end);
1092 if (stream_type < 0)
1094 pid = get16(&p, p_end) & 0x1fff;
1098 /* now create ffmpeg stream */
1099 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1100 pes = ts->pids[pid]->u.pes_filter.opaque;
1102 pes->st = av_new_stream(pes->stream, pes->pid);
1105 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1106 pes = add_pes_stream(ts, pid, pcr_pid);
1108 st = av_new_stream(pes->stream, pes->pid);
1114 if (!pes->stream_type)
1115 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1117 add_pid_to_pmt(ts, h->id, pid);
1119 ff_program_add_stream_index(ts->stream, h->id, st->index);
1121 desc_list_len = get16(&p, p_end) & 0xfff;
1122 if (desc_list_len < 0)
1124 desc_list_end = p + desc_list_len;
1125 if (desc_list_end > p_end)
1128 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1129 mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1132 if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1133 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1134 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1141 av_free(mp4_dec_config_descr);
1144 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1146 MpegTSContext *ts = filter->u.section_filter.opaque;
1147 SectionHeader h1, *h = &h1;
1148 const uint8_t *p, *p_end;
1152 av_dlog(ts->stream, "PAT:\n");
1153 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1155 p_end = section + section_len - 4;
1157 if (parse_section_header(h, &p, p_end) < 0)
1159 if (h->tid != PAT_TID)
1162 ts->stream->ts_id = h->id;
1166 sid = get16(&p, p_end);
1169 pmt_pid = get16(&p, p_end) & 0x1fff;
1173 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1175 if (sid == 0x0000) {
1178 program = av_new_program(ts->stream, sid);
1179 program->program_num = sid;
1180 program->pmt_pid = pmt_pid;
1181 if (ts->pids[pmt_pid])
1182 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1183 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1184 add_pat_entry(ts, sid);
1185 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1186 add_pid_to_pmt(ts, sid, pmt_pid);
1191 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1193 MpegTSContext *ts = filter->u.section_filter.opaque;
1194 SectionHeader h1, *h = &h1;
1195 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1196 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1197 char *name, *provider_name;
1199 av_dlog(ts->stream, "SDT:\n");
1200 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1202 p_end = section + section_len - 4;
1204 if (parse_section_header(h, &p, p_end) < 0)
1206 if (h->tid != SDT_TID)
1208 onid = get16(&p, p_end);
1211 val = get8(&p, p_end);
1215 sid = get16(&p, p_end);
1218 val = get8(&p, p_end);
1221 desc_list_len = get16(&p, p_end) & 0xfff;
1222 if (desc_list_len < 0)
1224 desc_list_end = p + desc_list_len;
1225 if (desc_list_end > p_end)
1228 desc_tag = get8(&p, desc_list_end);
1231 desc_len = get8(&p, desc_list_end);
1232 desc_end = p + desc_len;
1233 if (desc_end > desc_list_end)
1236 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1237 desc_tag, desc_len);
1241 service_type = get8(&p, p_end);
1242 if (service_type < 0)
1244 provider_name = getstr8(&p, p_end);
1247 name = getstr8(&p, p_end);
1249 AVProgram *program = av_new_program(ts->stream, sid);
1251 av_dict_set(&program->metadata, "service_name", name, 0);
1252 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1256 av_free(provider_name);
1267 /* handle one TS packet */
1268 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1270 AVFormatContext *s = ts->stream;
1272 int len, pid, cc, expected_cc, cc_ok, afc, is_start;
1273 const uint8_t *p, *p_end;
1276 pid = AV_RB16(packet + 1) & 0x1fff;
1277 if(pid && discard_pid(ts, pid))
1279 is_start = packet[1] & 0x40;
1280 tss = ts->pids[pid];
1281 if (ts->auto_guess && tss == NULL && is_start) {
1282 add_pes_stream(ts, pid, -1);
1283 tss = ts->pids[pid];
1288 /* continuity check (currently not used) */
1289 cc = (packet[3] & 0xf);
1290 expected_cc = (packet[3] & 0x10) ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1291 cc_ok = (tss->last_cc < 0) || (expected_cc == cc);
1294 /* skip adaptation field */
1295 afc = (packet[3] >> 4) & 3;
1297 if (afc == 0) /* reserved value */
1299 if (afc == 2) /* adaptation field only */
1302 /* skip adapation field */
1305 /* if past the end of packet, ignore */
1306 p_end = packet + TS_PACKET_SIZE;
1310 pos = avio_tell(ts->stream->pb);
1311 ts->pos47= pos % ts->raw_packet_size;
1313 if (tss->type == MPEGTS_SECTION) {
1315 /* pointer field present */
1317 if (p + len > p_end)
1320 /* write remaining section bytes */
1321 write_section_data(s, tss,
1323 /* check whether filter has been closed */
1329 write_section_data(s, tss,
1334 write_section_data(s, tss,
1340 // Note: The position here points actually behind the current packet.
1341 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1342 pos - ts->raw_packet_size)) < 0)
1349 /* XXX: try to find a better synchro over several packets (use
1350 get_packet_size() ?) */
1351 static int mpegts_resync(AVFormatContext *s)
1353 AVIOContext *pb = s->pb;
1356 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1361 avio_seek(pb, -1, SEEK_CUR);
1365 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1370 /* return -1 if error or EOF. Return 0 if OK. */
1371 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1373 AVIOContext *pb = s->pb;
1377 len = avio_read(pb, buf, TS_PACKET_SIZE);
1378 if (len != TS_PACKET_SIZE)
1379 return len < 0 ? len : AVERROR_EOF;
1380 /* check paquet sync byte */
1381 if (buf[0] != 0x47) {
1382 /* find a new packet start */
1383 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1384 if (mpegts_resync(s) < 0)
1385 return AVERROR(EAGAIN);
1389 skip = raw_packet_size - TS_PACKET_SIZE;
1391 avio_skip(pb, skip);
1398 static int handle_packets(MpegTSContext *ts, int nb_packets)
1400 AVFormatContext *s = ts->stream;
1401 uint8_t packet[TS_PACKET_SIZE];
1402 int packet_num, ret;
1407 if (ts->stop_parse>0)
1410 if (nb_packets != 0 && packet_num >= nb_packets)
1412 ret = read_packet(s, packet, ts->raw_packet_size);
1415 ret = handle_packet(ts, packet);
1422 static int mpegts_probe(AVProbeData *p)
1425 const int size= p->buf_size;
1426 int score, fec_score, dvhs_score;
1427 int check_count= size / TS_FEC_PACKET_SIZE;
1428 #define CHECK_COUNT 10
1430 if (check_count < CHECK_COUNT)
1433 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1434 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1435 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1436 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1438 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1439 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1440 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1441 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1444 /* only use the extension for safer guess */
1445 if (av_match_ext(p->filename, "ts"))
1446 return AVPROBE_SCORE_MAX;
1452 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1453 (-1) if not available */
1454 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1455 const uint8_t *packet)
1457 int afc, len, flags;
1461 afc = (packet[3] >> 4) & 3;
1471 if (!(flags & 0x10))
1476 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1477 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1481 static int mpegts_read_header(AVFormatContext *s,
1482 AVFormatParameters *ap)
1484 MpegTSContext *ts = s->priv_data;
1485 AVIOContext *pb = s->pb;
1486 uint8_t buf[8*1024];
1490 #if FF_API_FORMAT_PARAMETERS
1492 if (ap->mpeg2ts_compute_pcr)
1493 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1494 if(ap->mpeg2ts_raw){
1495 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1501 /* read the first 1024 bytes to get packet size */
1502 pos = avio_tell(pb);
1503 len = avio_read(pb, buf, sizeof(buf));
1504 if (len != sizeof(buf))
1506 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1507 if (ts->raw_packet_size <= 0) {
1508 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1509 ts->raw_packet_size = TS_PACKET_SIZE;
1514 if (s->iformat == &ff_mpegts_demuxer) {
1517 /* first do a scaning to get all the services */
1518 if (avio_seek(pb, pos, SEEK_SET) < 0)
1519 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1521 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1523 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1525 handle_packets(ts, s->probesize / ts->raw_packet_size);
1526 /* if could not find service, enable auto_guess */
1530 av_dlog(ts->stream, "tuning done\n");
1532 s->ctx_flags |= AVFMTCTX_NOHEADER;
1535 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1536 int64_t pcrs[2], pcr_h;
1537 int packet_count[2];
1538 uint8_t packet[TS_PACKET_SIZE];
1540 /* only read packets */
1542 st = av_new_stream(s, 0);
1545 av_set_pts_info(st, 60, 1, 27000000);
1546 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1547 st->codec->codec_id = CODEC_ID_MPEG2TS;
1549 /* we iterate until we find two PCRs to estimate the bitrate */
1554 ret = read_packet(s, packet, ts->raw_packet_size);
1557 pid = AV_RB16(packet + 1) & 0x1fff;
1558 if ((pcr_pid == -1 || pcr_pid == pid) &&
1559 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1561 packet_count[nb_pcrs] = nb_packets;
1562 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1570 /* NOTE1: the bitrate is computed without the FEC */
1571 /* NOTE2: it is only the bitrate of the start of the stream */
1572 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1573 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1574 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1575 st->codec->bit_rate = s->bit_rate;
1576 st->start_time = ts->cur_pcr;
1577 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1578 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1581 avio_seek(pb, pos, SEEK_SET);
1587 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1589 static int mpegts_raw_read_packet(AVFormatContext *s,
1592 MpegTSContext *ts = s->priv_data;
1594 int64_t pcr_h, next_pcr_h, pos;
1595 int pcr_l, next_pcr_l;
1596 uint8_t pcr_buf[12];
1598 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1599 return AVERROR(ENOMEM);
1600 pkt->pos= avio_tell(s->pb);
1601 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1603 av_free_packet(pkt);
1606 if (ts->mpeg2ts_compute_pcr) {
1607 /* compute exact PCR for each packet */
1608 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1609 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1610 pos = avio_tell(s->pb);
1611 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1612 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1613 avio_read(s->pb, pcr_buf, 12);
1614 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1615 /* XXX: not precise enough */
1616 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1621 avio_seek(s->pb, pos, SEEK_SET);
1622 /* no next PCR found: we use previous increment */
1623 ts->cur_pcr = pcr_h * 300 + pcr_l;
1625 pkt->pts = ts->cur_pcr;
1626 pkt->duration = ts->pcr_incr;
1627 ts->cur_pcr += ts->pcr_incr;
1629 pkt->stream_index = 0;
1633 static int mpegts_read_packet(AVFormatContext *s,
1636 MpegTSContext *ts = s->priv_data;
1639 if (avio_tell(s->pb) != ts->last_pos) {
1640 /* seek detected, flush pes buffer */
1641 for (i = 0; i < NB_PID_MAX; i++) {
1642 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1643 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1644 av_freep(&pes->buffer);
1645 pes->data_index = 0;
1646 pes->state = MPEGTS_SKIP; /* skip until pes header */
1652 ret = handle_packets(ts, 0);
1654 /* flush pes data left */
1655 for (i = 0; i < NB_PID_MAX; i++) {
1656 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1657 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1658 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1659 new_pes_packet(pes, pkt);
1660 pes->state = MPEGTS_SKIP;
1668 ts->last_pos = avio_tell(s->pb);
1673 static int mpegts_read_close(AVFormatContext *s)
1675 MpegTSContext *ts = s->priv_data;
1680 for(i=0;i<NB_PID_MAX;i++)
1681 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1686 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1687 int64_t *ppos, int64_t pos_limit)
1689 MpegTSContext *ts = s->priv_data;
1690 int64_t pos, timestamp;
1691 uint8_t buf[TS_PACKET_SIZE];
1692 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1693 const int find_next= 1;
1694 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1697 avio_seek(s->pb, pos, SEEK_SET);
1698 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1699 return AV_NOPTS_VALUE;
1700 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1701 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1704 pos += ts->raw_packet_size;
1708 pos -= ts->raw_packet_size;
1710 return AV_NOPTS_VALUE;
1711 avio_seek(s->pb, pos, SEEK_SET);
1712 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1713 return AV_NOPTS_VALUE;
1714 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1715 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1725 #ifdef USE_SYNCPOINT_SEARCH
1727 static int read_seek2(AVFormatContext *s,
1736 int64_t ts_ret, ts_adj;
1737 int stream_index_gen_search;
1739 AVParserState *backup;
1741 backup = ff_store_parser_state(s);
1743 // detect direction of seeking for search purposes
1744 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1745 AVSEEK_FLAG_BACKWARD : 0;
1747 if (flags & AVSEEK_FLAG_BYTE) {
1748 // use position directly, we will search starting from it
1751 // search for some position with good timestamp match
1752 if (stream_index < 0) {
1753 stream_index_gen_search = av_find_default_stream_index(s);
1754 if (stream_index_gen_search < 0) {
1755 ff_restore_parser_state(s, backup);
1759 st = s->streams[stream_index_gen_search];
1760 // timestamp for default must be expressed in AV_TIME_BASE units
1761 ts_adj = av_rescale(target_ts,
1763 AV_TIME_BASE * (int64_t)st->time_base.num);
1766 stream_index_gen_search = stream_index;
1768 pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1772 flags, &ts_ret, mpegts_get_pcr);
1774 ff_restore_parser_state(s, backup);
1779 // search for actual matching keyframe/starting position for all streams
1780 if (ff_gen_syncpoint_search(s, stream_index, pos,
1781 min_ts, target_ts, max_ts,
1783 ff_restore_parser_state(s, backup);
1787 ff_free_parser_state(s, backup);
1791 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1794 if (flags & AVSEEK_FLAG_BACKWARD) {
1795 flags &= ~AVSEEK_FLAG_BACKWARD;
1796 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1798 // for compatibility reasons, seek to the best-fitting timestamp
1799 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1801 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1803 // for compatibility reasons, seek to the best-fitting timestamp
1804 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1811 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1812 MpegTSContext *ts = s->priv_data;
1813 uint8_t buf[TS_PACKET_SIZE];
1816 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1819 pos= avio_tell(s->pb);
1822 avio_seek(s->pb, pos, SEEK_SET);
1823 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1825 // pid = AV_RB16(buf + 1) & 0x1fff;
1826 if(buf[1] & 0x40) break;
1827 pos += ts->raw_packet_size;
1829 avio_seek(s->pb, pos, SEEK_SET);
1836 /**************************************************************/
1837 /* parsing functions - called from other demuxers such as RTP */
1839 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1843 ts = av_mallocz(sizeof(MpegTSContext));
1846 /* no stream case, currently used by RTP */
1847 ts->raw_packet_size = TS_PACKET_SIZE;
1853 /* return the consumed length if a packet was output, or -1 if no
1855 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1856 const uint8_t *buf, int len)
1864 if (ts->stop_parse>0)
1866 if (len < TS_PACKET_SIZE)
1868 if (buf[0] != 0x47) {
1872 handle_packet(ts, buf);
1873 buf += TS_PACKET_SIZE;
1874 len -= TS_PACKET_SIZE;
1880 void ff_mpegts_parse_close(MpegTSContext *ts)
1884 for(i=0;i<NB_PID_MAX;i++)
1885 av_free(ts->pids[i]);
1889 AVInputFormat ff_mpegts_demuxer = {
1891 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1892 .priv_data_size = sizeof(MpegTSContext),
1893 .read_probe = mpegts_probe,
1894 .read_header = mpegts_read_header,
1895 .read_packet = mpegts_read_packet,
1896 .read_close = mpegts_read_close,
1897 .read_seek = read_seek,
1898 .read_timestamp = mpegts_get_pcr,
1899 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1900 #ifdef USE_SYNCPOINT_SEARCH
1901 .read_seek2 = read_seek2,
1905 AVInputFormat ff_mpegtsraw_demuxer = {
1906 .name = "mpegtsraw",
1907 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1908 .priv_data_size = sizeof(MpegTSContext),
1909 .read_header = mpegts_read_header,
1910 .read_packet = mpegts_raw_read_packet,
1911 .read_close = mpegts_read_close,
1912 .read_seek = read_seek,
1913 .read_timestamp = mpegts_get_pcr,
1914 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1915 #ifdef USE_SYNCPOINT_SEARCH
1916 .read_seek2 = read_seek2,
1918 .priv_class = &mpegtsraw_class,