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 /* Makito encoder sets stream type 0x11 for AAC,
529 * so auto-detect LOAS/LATM instead of hardcoding it. */
530 // { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
531 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
532 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
533 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
537 static const StreamType HDMV_types[] = {
538 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
539 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
540 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
541 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
542 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
543 { 0x85, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS HD */
544 { 0x86, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS HD MASTER*/
545 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
550 static const StreamType MISC_types[] = {
551 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
552 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
556 static const StreamType REGD_types[] = {
557 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
558 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
559 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
560 { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
561 { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
562 { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
563 { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
567 /* descriptor present */
568 static const StreamType DESC_types[] = {
569 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
570 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
571 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
572 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
573 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
577 static void mpegts_find_stream_type(AVStream *st,
578 uint32_t stream_type, const StreamType *types)
580 for (; types->stream_type; types++) {
581 if (stream_type == types->stream_type) {
582 st->codec->codec_type = types->codec_type;
583 st->codec->codec_id = types->codec_id;
584 st->request_probe = 0;
590 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
591 uint32_t stream_type, uint32_t prog_reg_desc)
593 av_set_pts_info(st, 33, 1, 90000);
595 st->codec->codec_type = AVMEDIA_TYPE_DATA;
596 st->codec->codec_id = CODEC_ID_NONE;
597 st->need_parsing = AVSTREAM_PARSE_FULL;
599 pes->stream_type = stream_type;
601 av_log(pes->stream, AV_LOG_DEBUG,
602 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
603 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
605 st->codec->codec_tag = pes->stream_type;
607 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
608 if (prog_reg_desc == AV_RL32("HDMV") &&
609 st->codec->codec_id == CODEC_ID_NONE) {
610 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
611 if (pes->stream_type == 0x83) {
612 // HDMV TrueHD streams also contain an AC3 coded version of the
613 // audio track - add a second stream for this
615 // priv_data cannot be shared between streams
616 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
618 return AVERROR(ENOMEM);
619 memcpy(sub_pes, pes, sizeof(*sub_pes));
621 sub_st = av_new_stream(pes->stream, pes->pid);
624 return AVERROR(ENOMEM);
627 av_set_pts_info(sub_st, 33, 1, 90000);
628 sub_st->priv_data = sub_pes;
629 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
630 sub_st->codec->codec_id = CODEC_ID_AC3;
631 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
632 sub_pes->sub_st = pes->sub_st = sub_st;
635 if (st->codec->codec_id == CODEC_ID_NONE)
636 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
641 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
645 pkt->destruct = av_destruct_packet;
646 pkt->data = pes->buffer;
647 pkt->size = pes->data_index;
649 if(pes->total_size != MAX_PES_PAYLOAD &&
650 pes->pes_header_size + pes->data_index != pes->total_size + 6) {
651 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
652 pes->flags |= AV_PKT_FLAG_CORRUPT;
654 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
656 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
657 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
658 pkt->stream_index = pes->sub_st->index;
660 pkt->stream_index = pes->st->index;
663 /* store position of first TS packet of this PES packet */
664 pkt->pos = pes->ts_packet_pos;
665 pkt->flags = pes->flags;
667 /* reset pts values */
668 pes->pts = AV_NOPTS_VALUE;
669 pes->dts = AV_NOPTS_VALUE;
675 /* return non zero if a packet could be constructed */
676 static int mpegts_push_data(MpegTSFilter *filter,
677 const uint8_t *buf, int buf_size, int is_start,
680 PESContext *pes = filter->u.pes_filter.opaque;
681 MpegTSContext *ts = pes->ts;
689 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
690 new_pes_packet(pes, ts->pkt);
693 pes->state = MPEGTS_HEADER;
695 pes->ts_packet_pos = pos;
698 while (buf_size > 0) {
701 len = PES_START_SIZE - pes->data_index;
704 memcpy(pes->header + pes->data_index, p, len);
705 pes->data_index += len;
708 if (pes->data_index == PES_START_SIZE) {
709 /* we got all the PES or section header. We can now
711 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
712 pes->header[2] == 0x01) {
713 /* it must be an mpeg2 PES stream */
714 code = pes->header[3] | 0x100;
715 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
717 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
718 code == 0x1be) /* padding_stream */
721 /* stream not present in PMT */
723 pes->st = av_new_stream(ts->stream, pes->pid);
725 return AVERROR(ENOMEM);
726 mpegts_set_stream_info(pes->st, pes, 0, 0);
729 pes->total_size = AV_RB16(pes->header + 4);
730 /* NOTE: a zero total size means the PES size is
732 if (!pes->total_size)
733 pes->total_size = MAX_PES_PAYLOAD;
735 /* allocate pes buffer */
736 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
738 return AVERROR(ENOMEM);
740 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
741 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
742 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
743 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
744 pes->state = MPEGTS_PESHEADER;
745 if (pes->st->codec->codec_id == CODEC_ID_NONE && !pes->st->request_probe) {
746 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
747 pes->pid, pes->stream_type);
748 pes->st->request_probe= 1;
751 pes->state = MPEGTS_PAYLOAD;
755 /* otherwise, it should be a table */
758 pes->state = MPEGTS_SKIP;
763 /**********************************************/
764 /* PES packing parsing */
765 case MPEGTS_PESHEADER:
766 len = PES_HEADER_SIZE - pes->data_index;
771 memcpy(pes->header + pes->data_index, p, len);
772 pes->data_index += len;
775 if (pes->data_index == PES_HEADER_SIZE) {
776 pes->pes_header_size = pes->header[8] + 9;
777 pes->state = MPEGTS_PESHEADER_FILL;
780 case MPEGTS_PESHEADER_FILL:
781 len = pes->pes_header_size - pes->data_index;
786 memcpy(pes->header + pes->data_index, p, len);
787 pes->data_index += len;
790 if (pes->data_index == pes->pes_header_size) {
792 unsigned int flags, pes_ext, skip;
794 flags = pes->header[7];
796 pes->pts = AV_NOPTS_VALUE;
797 pes->dts = AV_NOPTS_VALUE;
798 if ((flags & 0xc0) == 0x80) {
799 pes->dts = pes->pts = ff_parse_pes_pts(r);
801 } else if ((flags & 0xc0) == 0xc0) {
802 pes->pts = ff_parse_pes_pts(r);
804 pes->dts = ff_parse_pes_pts(r);
807 pes->extended_stream_id = -1;
808 if (flags & 0x01) { /* PES extension */
810 /* Skip PES private data, program packet sequence counter and P-STD buffer */
811 skip = (pes_ext >> 4) & 0xb;
814 if ((pes_ext & 0x41) == 0x01 &&
815 (r + 2) <= (pes->header + pes->pes_header_size)) {
816 /* PES extension 2 */
817 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
818 pes->extended_stream_id = r[1];
822 /* we got the full header. We parse it and get the payload */
823 pes->state = MPEGTS_PAYLOAD;
828 if (buf_size > 0 && pes->buffer) {
829 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
830 new_pes_packet(pes, ts->pkt);
831 pes->total_size = MAX_PES_PAYLOAD;
832 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
834 return AVERROR(ENOMEM);
836 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
837 // pes packet size is < ts size packet and pes data is padded with 0xff
838 // not sure if this is legal in ts but see issue #2392
839 buf_size = pes->total_size;
841 memcpy(pes->buffer+pes->data_index, p, buf_size);
842 pes->data_index += buf_size;
845 /* emit complete packets with known packet size
846 * decreases demuxer delay for infrequent packets like subtitles from
847 * a couple of seconds to milliseconds for properly muxed files.
848 * total_size is the number of bytes following pes_packet_length
849 * in the pes header, i.e. not counting the first 6 bytes */
850 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
851 pes->pes_header_size + pes->data_index == pes->total_size + 6) {
853 new_pes_packet(pes, ts->pkt);
865 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
870 /* if no pid found, then add a pid context */
871 pes = av_mallocz(sizeof(PESContext));
875 pes->stream = ts->stream;
877 pes->pcr_pid = pcr_pid;
878 pes->state = MPEGTS_SKIP;
879 pes->pts = AV_NOPTS_VALUE;
880 pes->dts = AV_NOPTS_VALUE;
881 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
889 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
890 int *es_id, uint8_t **dec_config_descr,
891 int *dec_config_descr_size)
897 ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
899 len = ff_mp4_read_descr(s, &pb, &tag);
900 if (tag == MP4IODescrTag) {
901 avio_rb16(&pb); // ID
907 len = ff_mp4_read_descr(s, &pb, &tag);
908 if (tag == MP4ESDescrTag) {
909 ff_mp4_parse_es_descr(&pb, es_id);
910 av_dlog(s, "ES_ID %#x\n", *es_id);
911 len = ff_mp4_read_descr(s, &pb, &tag);
912 if (tag == MP4DecConfigDescrTag) {
913 *dec_config_descr = av_malloc(len);
914 if (!*dec_config_descr)
915 return AVERROR(ENOMEM);
916 *dec_config_descr_size = len;
917 avio_read(&pb, *dec_config_descr, len);
924 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
925 const uint8_t **pp, const uint8_t *desc_list_end,
926 int mp4_dec_config_descr_len, int mp4_es_id, int pid,
927 uint8_t *mp4_dec_config_descr)
929 const uint8_t *desc_end;
930 int desc_len, desc_tag;
934 desc_tag = get8(pp, desc_list_end);
937 desc_len = get8(pp, desc_list_end);
940 desc_end = *pp + desc_len;
941 if (desc_end > desc_list_end)
944 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
946 if (st->codec->codec_id == CODEC_ID_NONE &&
947 stream_type == STREAM_TYPE_PRIVATE_DATA)
948 mpegts_find_stream_type(st, desc_tag, DESC_types);
951 case 0x1F: /* FMC descriptor */
953 if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
954 mp4_dec_config_descr_len && mp4_es_id == pid) {
956 ffio_init_context(&pb, mp4_dec_config_descr,
957 mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
958 ff_mp4_read_dec_config_descr(fc, st, &pb);
959 if (st->codec->codec_id == CODEC_ID_AAC &&
960 st->codec->extradata_size > 0)
961 st->need_parsing = 0;
964 case 0x56: /* DVB teletext descriptor */
965 language[0] = get8(pp, desc_end);
966 language[1] = get8(pp, desc_end);
967 language[2] = get8(pp, desc_end);
969 av_dict_set(&st->metadata, "language", language, 0);
971 case 0x59: /* subtitling descriptor */
972 language[0] = get8(pp, desc_end);
973 language[1] = get8(pp, desc_end);
974 language[2] = get8(pp, desc_end);
976 /* hearing impaired subtitles detection */
977 switch(get8(pp, desc_end)) {
978 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
979 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
980 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
981 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
982 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
983 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
984 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
987 if (st->codec->extradata) {
988 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
989 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
991 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
992 if (st->codec->extradata) {
993 st->codec->extradata_size = 4;
994 memcpy(st->codec->extradata, *pp, 4);
998 av_dict_set(&st->metadata, "language", language, 0);
1000 case 0x0a: /* ISO 639 language descriptor */
1001 for (i = 0; i + 4 <= desc_len; i += 4) {
1002 language[i + 0] = get8(pp, desc_end);
1003 language[i + 1] = get8(pp, desc_end);
1004 language[i + 2] = get8(pp, desc_end);
1005 language[i + 3] = ',';
1006 switch (get8(pp, desc_end)) {
1007 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1008 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1009 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1013 language[i - 1] = 0;
1014 av_dict_set(&st->metadata, "language", language, 0);
1017 case 0x05: /* registration descriptor */
1018 st->codec->codec_tag = bytestream_get_le32(pp);
1019 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1020 if (st->codec->codec_id == CODEC_ID_NONE &&
1021 stream_type == STREAM_TYPE_PRIVATE_DATA)
1022 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1024 case 0x52: /* stream identifier descriptor */
1025 st->stream_identifier = 1 + get8(pp, desc_end);
1034 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1036 MpegTSContext *ts = filter->u.section_filter.opaque;
1037 SectionHeader h1, *h = &h1;
1040 const uint8_t *p, *p_end, *desc_list_end;
1041 int program_info_length, pcr_pid, pid, stream_type;
1043 uint32_t prog_reg_desc = 0; /* registration descriptor */
1044 uint8_t *mp4_dec_config_descr = NULL;
1045 int mp4_dec_config_descr_len = 0;
1048 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1049 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1051 p_end = section + section_len - 4;
1053 if (parse_section_header(h, &p, p_end) < 0)
1056 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1057 h->id, h->sec_num, h->last_sec_num);
1059 if (h->tid != PMT_TID)
1062 clear_program(ts, h->id);
1063 pcr_pid = get16(&p, p_end) & 0x1fff;
1066 add_pid_to_pmt(ts, h->id, pcr_pid);
1067 set_pcr_pid(ts->stream, h->id, pcr_pid);
1069 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1071 program_info_length = get16(&p, p_end) & 0xfff;
1072 if (program_info_length < 0)
1074 while(program_info_length >= 2) {
1076 tag = get8(&p, p_end);
1077 len = get8(&p, p_end);
1079 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1081 if(len > program_info_length - 2)
1082 //something else is broken, exit the program_descriptors_loop
1084 program_info_length -= len + 2;
1085 if (tag == 0x1d) { // IOD descriptor
1086 get8(&p, p_end); // scope
1087 get8(&p, p_end); // label
1089 mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1090 &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1091 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1092 prog_reg_desc = bytestream_get_le32(&p);
1097 p += program_info_length;
1101 // stop parsing after pmt, we found header
1102 if (!ts->stream->nb_streams)
1107 stream_type = get8(&p, p_end);
1108 if (stream_type < 0)
1110 pid = get16(&p, p_end) & 0x1fff;
1114 /* now create ffmpeg stream */
1115 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1116 pes = ts->pids[pid]->u.pes_filter.opaque;
1118 pes->st = av_new_stream(pes->stream, pes->pid);
1121 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1122 pes = add_pes_stream(ts, pid, pcr_pid);
1124 st = av_new_stream(pes->stream, pes->pid);
1130 if (!pes->stream_type)
1131 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1133 add_pid_to_pmt(ts, h->id, pid);
1135 ff_program_add_stream_index(ts->stream, h->id, st->index);
1137 desc_list_len = get16(&p, p_end) & 0xfff;
1138 if (desc_list_len < 0)
1140 desc_list_end = p + desc_list_len;
1141 if (desc_list_end > p_end)
1144 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1145 mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1148 if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1149 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1150 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1157 av_free(mp4_dec_config_descr);
1160 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1162 MpegTSContext *ts = filter->u.section_filter.opaque;
1163 SectionHeader h1, *h = &h1;
1164 const uint8_t *p, *p_end;
1168 av_dlog(ts->stream, "PAT:\n");
1169 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1171 p_end = section + section_len - 4;
1173 if (parse_section_header(h, &p, p_end) < 0)
1175 if (h->tid != PAT_TID)
1178 ts->stream->ts_id = h->id;
1182 sid = get16(&p, p_end);
1185 pmt_pid = get16(&p, p_end) & 0x1fff;
1189 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1191 if (sid == 0x0000) {
1194 program = av_new_program(ts->stream, sid);
1195 program->program_num = sid;
1196 program->pmt_pid = pmt_pid;
1197 if (ts->pids[pmt_pid])
1198 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1199 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1200 add_pat_entry(ts, sid);
1201 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1202 add_pid_to_pmt(ts, sid, pmt_pid);
1207 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1209 MpegTSContext *ts = filter->u.section_filter.opaque;
1210 SectionHeader h1, *h = &h1;
1211 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1212 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1213 char *name, *provider_name;
1215 av_dlog(ts->stream, "SDT:\n");
1216 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1218 p_end = section + section_len - 4;
1220 if (parse_section_header(h, &p, p_end) < 0)
1222 if (h->tid != SDT_TID)
1224 onid = get16(&p, p_end);
1227 val = get8(&p, p_end);
1231 sid = get16(&p, p_end);
1234 val = get8(&p, p_end);
1237 desc_list_len = get16(&p, p_end) & 0xfff;
1238 if (desc_list_len < 0)
1240 desc_list_end = p + desc_list_len;
1241 if (desc_list_end > p_end)
1244 desc_tag = get8(&p, desc_list_end);
1247 desc_len = get8(&p, desc_list_end);
1248 desc_end = p + desc_len;
1249 if (desc_end > desc_list_end)
1252 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1253 desc_tag, desc_len);
1257 service_type = get8(&p, p_end);
1258 if (service_type < 0)
1260 provider_name = getstr8(&p, p_end);
1263 name = getstr8(&p, p_end);
1265 AVProgram *program = av_new_program(ts->stream, sid);
1267 av_dict_set(&program->metadata, "service_name", name, 0);
1268 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1272 av_free(provider_name);
1283 /* handle one TS packet */
1284 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1286 AVFormatContext *s = ts->stream;
1288 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1289 has_adaptation, has_payload;
1290 const uint8_t *p, *p_end;
1293 pid = AV_RB16(packet + 1) & 0x1fff;
1294 if(pid && discard_pid(ts, pid))
1296 is_start = packet[1] & 0x40;
1297 tss = ts->pids[pid];
1298 if (ts->auto_guess && tss == NULL && is_start) {
1299 add_pes_stream(ts, pid, -1);
1300 tss = ts->pids[pid];
1305 afc = (packet[3] >> 4) & 3;
1306 if (afc == 0) /* reserved value */
1308 has_adaptation = afc & 2;
1309 has_payload = afc & 1;
1310 is_discontinuity = has_adaptation
1311 && packet[4] != 0 /* with length > 0 */
1312 && (packet[5] & 0x80); /* and discontinuity indicated */
1314 /* continuity check (currently not used) */
1315 cc = (packet[3] & 0xf);
1316 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1317 cc_ok = pid == 0x1FFF // null packet PID
1320 || expected_cc == cc;
1324 av_log(ts->stream, AV_LOG_WARNING,
1325 "Continuity check failed for pid %d expected %d got %d\n",
1326 pid, expected_cc, cc);
1327 if(tss->type == MPEGTS_PES) {
1328 PESContext *pc = tss->u.pes_filter.opaque;
1329 pc->flags |= AV_PKT_FLAG_CORRUPT;
1336 if (has_adaptation) {
1337 /* skip adapation field */
1340 /* if past the end of packet, ignore */
1341 p_end = packet + TS_PACKET_SIZE;
1345 pos = avio_tell(ts->stream->pb);
1346 ts->pos47= pos % ts->raw_packet_size;
1348 if (tss->type == MPEGTS_SECTION) {
1350 /* pointer field present */
1352 if (p + len > p_end)
1355 /* write remaining section bytes */
1356 write_section_data(s, tss,
1358 /* check whether filter has been closed */
1364 write_section_data(s, tss,
1369 write_section_data(s, tss,
1375 // Note: The position here points actually behind the current packet.
1376 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1377 pos - ts->raw_packet_size)) < 0)
1384 /* XXX: try to find a better synchro over several packets (use
1385 get_packet_size() ?) */
1386 static int mpegts_resync(AVFormatContext *s)
1388 AVIOContext *pb = s->pb;
1391 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1396 avio_seek(pb, -1, SEEK_CUR);
1400 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1405 /* return -1 if error or EOF. Return 0 if OK. */
1406 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1408 AVIOContext *pb = s->pb;
1412 len = avio_read(pb, buf, TS_PACKET_SIZE);
1413 if (len != TS_PACKET_SIZE)
1414 return len < 0 ? len : AVERROR_EOF;
1415 /* check paquet sync byte */
1416 if (buf[0] != 0x47) {
1417 /* find a new packet start */
1418 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1419 if (mpegts_resync(s) < 0)
1420 return AVERROR(EAGAIN);
1424 skip = raw_packet_size - TS_PACKET_SIZE;
1426 avio_skip(pb, skip);
1433 static int handle_packets(MpegTSContext *ts, int nb_packets)
1435 AVFormatContext *s = ts->stream;
1436 uint8_t packet[TS_PACKET_SIZE];
1437 int packet_num, ret = 0;
1439 if (avio_tell(s->pb) != ts->last_pos) {
1441 // av_dlog("Skipping after seek\n");
1442 /* seek detected, flush pes buffer */
1443 for (i = 0; i < NB_PID_MAX; i++) {
1445 if (ts->pids[i]->type == MPEGTS_PES) {
1446 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1447 av_freep(&pes->buffer);
1448 pes->data_index = 0;
1449 pes->state = MPEGTS_SKIP; /* skip until pes header */
1451 ts->pids[i]->last_cc = -1;
1459 if (ts->stop_parse>0)
1462 if (nb_packets != 0 && packet_num >= nb_packets)
1464 ret = read_packet(s, packet, ts->raw_packet_size);
1467 ret = handle_packet(ts, packet);
1471 ts->last_pos = avio_tell(s->pb);
1475 static int mpegts_probe(AVProbeData *p)
1478 const int size= p->buf_size;
1479 int score, fec_score, dvhs_score;
1480 int check_count= size / TS_FEC_PACKET_SIZE;
1481 #define CHECK_COUNT 10
1483 if (check_count < CHECK_COUNT)
1486 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1487 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1488 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1489 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1491 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1492 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1493 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1494 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1497 /* only use the extension for safer guess */
1498 if (av_match_ext(p->filename, "ts"))
1499 return AVPROBE_SCORE_MAX;
1505 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1506 (-1) if not available */
1507 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1508 const uint8_t *packet)
1510 int afc, len, flags;
1514 afc = (packet[3] >> 4) & 3;
1524 if (!(flags & 0x10))
1529 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1530 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1534 static int mpegts_read_header(AVFormatContext *s,
1535 AVFormatParameters *ap)
1537 MpegTSContext *ts = s->priv_data;
1538 AVIOContext *pb = s->pb;
1539 uint8_t buf[8*1024];
1543 /* read the first 8192 bytes to get packet size */
1544 pos = avio_tell(pb);
1545 len = avio_read(pb, buf, sizeof(buf));
1546 if (len != sizeof(buf))
1548 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1549 if (ts->raw_packet_size <= 0) {
1550 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1551 ts->raw_packet_size = TS_PACKET_SIZE;
1556 if (s->iformat == &ff_mpegts_demuxer) {
1559 /* first do a scaning to get all the services */
1560 if (pb->seekable && avio_seek(pb, pos, SEEK_SET) < 0)
1561 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1563 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1565 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1567 handle_packets(ts, s->probesize / ts->raw_packet_size);
1568 /* if could not find service, enable auto_guess */
1572 av_dlog(ts->stream, "tuning done\n");
1574 s->ctx_flags |= AVFMTCTX_NOHEADER;
1577 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1578 int64_t pcrs[2], pcr_h;
1579 int packet_count[2];
1580 uint8_t packet[TS_PACKET_SIZE];
1582 /* only read packets */
1584 st = av_new_stream(s, 0);
1587 av_set_pts_info(st, 60, 1, 27000000);
1588 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1589 st->codec->codec_id = CODEC_ID_MPEG2TS;
1591 /* we iterate until we find two PCRs to estimate the bitrate */
1596 ret = read_packet(s, packet, ts->raw_packet_size);
1599 pid = AV_RB16(packet + 1) & 0x1fff;
1600 if ((pcr_pid == -1 || pcr_pid == pid) &&
1601 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1603 packet_count[nb_pcrs] = nb_packets;
1604 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1612 /* NOTE1: the bitrate is computed without the FEC */
1613 /* NOTE2: it is only the bitrate of the start of the stream */
1614 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1615 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1616 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1617 st->codec->bit_rate = s->bit_rate;
1618 st->start_time = ts->cur_pcr;
1619 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1620 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1623 avio_seek(pb, pos, SEEK_SET);
1629 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1631 static int mpegts_raw_read_packet(AVFormatContext *s,
1634 MpegTSContext *ts = s->priv_data;
1636 int64_t pcr_h, next_pcr_h, pos;
1637 int pcr_l, next_pcr_l;
1638 uint8_t pcr_buf[12];
1640 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1641 return AVERROR(ENOMEM);
1642 pkt->pos= avio_tell(s->pb);
1643 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1645 av_free_packet(pkt);
1648 if (ts->mpeg2ts_compute_pcr) {
1649 /* compute exact PCR for each packet */
1650 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1651 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1652 pos = avio_tell(s->pb);
1653 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1654 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1655 avio_read(s->pb, pcr_buf, 12);
1656 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1657 /* XXX: not precise enough */
1658 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1663 avio_seek(s->pb, pos, SEEK_SET);
1664 /* no next PCR found: we use previous increment */
1665 ts->cur_pcr = pcr_h * 300 + pcr_l;
1667 pkt->pts = ts->cur_pcr;
1668 pkt->duration = ts->pcr_incr;
1669 ts->cur_pcr += ts->pcr_incr;
1671 pkt->stream_index = 0;
1675 static int mpegts_read_packet(AVFormatContext *s,
1678 MpegTSContext *ts = s->priv_data;
1682 ret = handle_packets(ts, 0);
1684 /* flush pes data left */
1685 for (i = 0; i < NB_PID_MAX; i++) {
1686 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1687 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1688 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1689 new_pes_packet(pes, pkt);
1690 pes->state = MPEGTS_SKIP;
1701 static int mpegts_read_close(AVFormatContext *s)
1703 MpegTSContext *ts = s->priv_data;
1708 for(i=0;i<NB_PID_MAX;i++)
1709 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1714 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1715 int64_t *ppos, int64_t pos_limit)
1717 MpegTSContext *ts = s->priv_data;
1718 int64_t pos, timestamp;
1719 uint8_t buf[TS_PACKET_SIZE];
1720 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1721 const int find_next= 1;
1722 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1725 avio_seek(s->pb, pos, SEEK_SET);
1726 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1727 return AV_NOPTS_VALUE;
1728 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1729 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1732 pos += ts->raw_packet_size;
1736 pos -= ts->raw_packet_size;
1738 return AV_NOPTS_VALUE;
1739 avio_seek(s->pb, pos, SEEK_SET);
1740 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1741 return AV_NOPTS_VALUE;
1742 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1743 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1753 #ifdef USE_SYNCPOINT_SEARCH
1755 static int read_seek2(AVFormatContext *s,
1764 int64_t ts_ret, ts_adj;
1765 int stream_index_gen_search;
1767 AVParserState *backup;
1769 backup = ff_store_parser_state(s);
1771 // detect direction of seeking for search purposes
1772 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1773 AVSEEK_FLAG_BACKWARD : 0;
1775 if (flags & AVSEEK_FLAG_BYTE) {
1776 // use position directly, we will search starting from it
1779 // search for some position with good timestamp match
1780 if (stream_index < 0) {
1781 stream_index_gen_search = av_find_default_stream_index(s);
1782 if (stream_index_gen_search < 0) {
1783 ff_restore_parser_state(s, backup);
1787 st = s->streams[stream_index_gen_search];
1788 // timestamp for default must be expressed in AV_TIME_BASE units
1789 ts_adj = av_rescale(target_ts,
1791 AV_TIME_BASE * (int64_t)st->time_base.num);
1794 stream_index_gen_search = stream_index;
1796 pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1800 flags, &ts_ret, mpegts_get_pcr);
1802 ff_restore_parser_state(s, backup);
1807 // search for actual matching keyframe/starting position for all streams
1808 if (ff_gen_syncpoint_search(s, stream_index, pos,
1809 min_ts, target_ts, max_ts,
1811 ff_restore_parser_state(s, backup);
1815 ff_free_parser_state(s, backup);
1819 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1822 if (flags & AVSEEK_FLAG_BACKWARD) {
1823 flags &= ~AVSEEK_FLAG_BACKWARD;
1824 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1826 // for compatibility reasons, seek to the best-fitting timestamp
1827 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1829 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1831 // for compatibility reasons, seek to the best-fitting timestamp
1832 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1839 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1840 MpegTSContext *ts = s->priv_data;
1841 uint8_t buf[TS_PACKET_SIZE];
1844 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1847 pos= avio_tell(s->pb);
1850 avio_seek(s->pb, pos, SEEK_SET);
1851 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1853 // pid = AV_RB16(buf + 1) & 0x1fff;
1854 if(buf[1] & 0x40) break;
1855 pos += ts->raw_packet_size;
1857 avio_seek(s->pb, pos, SEEK_SET);
1864 /**************************************************************/
1865 /* parsing functions - called from other demuxers such as RTP */
1867 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1871 ts = av_mallocz(sizeof(MpegTSContext));
1874 /* no stream case, currently used by RTP */
1875 ts->raw_packet_size = TS_PACKET_SIZE;
1878 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1879 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1884 /* return the consumed length if a packet was output, or -1 if no
1886 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1887 const uint8_t *buf, int len)
1895 if (ts->stop_parse>0)
1897 if (len < TS_PACKET_SIZE)
1899 if (buf[0] != 0x47) {
1903 handle_packet(ts, buf);
1904 buf += TS_PACKET_SIZE;
1905 len -= TS_PACKET_SIZE;
1911 void ff_mpegts_parse_close(MpegTSContext *ts)
1915 for(i=0;i<NB_PID_MAX;i++)
1916 av_free(ts->pids[i]);
1920 AVInputFormat ff_mpegts_demuxer = {
1922 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1923 .priv_data_size = sizeof(MpegTSContext),
1924 .read_probe = mpegts_probe,
1925 .read_header = mpegts_read_header,
1926 .read_packet = mpegts_read_packet,
1927 .read_close = mpegts_read_close,
1928 .read_seek = read_seek,
1929 .read_timestamp = mpegts_get_pcr,
1930 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1931 #ifdef USE_SYNCPOINT_SEARCH
1932 .read_seek2 = read_seek2,
1936 AVInputFormat ff_mpegtsraw_demuxer = {
1937 .name = "mpegtsraw",
1938 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1939 .priv_data_size = sizeof(MpegTSContext),
1940 .read_header = mpegts_read_header,
1941 .read_packet = mpegts_raw_read_packet,
1942 .read_close = mpegts_read_close,
1943 .read_seek = read_seek,
1944 .read_timestamp = mpegts_get_pcr,
1945 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1946 #ifdef USE_SYNCPOINT_SEARCH
1947 .read_seek2 = read_seek2,
1949 .priv_class = &mpegtsraw_class,