2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 //#define USE_SYNCPOINT_SEARCH
24 #include "libavutil/crc.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/opt.h"
29 #include "libavcodec/bytestream.h"
33 #include "avio_internal.h"
38 /* maximum size in which we look for synchronisation if
39 synchronisation is lost */
40 #define MAX_RESYNC_SIZE 65536
42 #define MAX_PES_PAYLOAD 200*1024
44 enum MpegTSFilterType {
49 typedef struct MpegTSFilter MpegTSFilter;
51 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
53 typedef struct MpegTSPESFilter {
58 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
60 typedef void SetServiceCallback(void *opaque, int ret);
62 typedef struct MpegTSSectionFilter {
66 unsigned int check_crc:1;
67 unsigned int end_of_section_reached:1;
68 SectionCallback *section_cb;
70 } MpegTSSectionFilter;
74 int last_cc; /* last cc code (-1 if first packet) */
75 enum MpegTSFilterType type;
77 MpegTSPESFilter pes_filter;
78 MpegTSSectionFilter section_filter;
82 #define MAX_PIDS_PER_PROGRAM 64
84 unsigned int id; //program id/service id
86 unsigned int pids[MAX_PIDS_PER_PROGRAM];
89 struct MpegTSContext {
92 AVFormatContext *stream;
93 /** raw packet size, including FEC if present */
98 /** if true, all pids are analyzed to find streams */
101 /** compute exact PCR for each transport stream packet */
102 int mpeg2ts_compute_pcr;
104 int64_t cur_pcr; /**< used to estimate the exact PCR */
105 int pcr_incr; /**< used to estimate the exact PCR */
107 /* data needed to handle file based ts */
108 /** stop parsing loop */
110 /** packet containing Audio/Video data */
112 /** to detect seek */
115 /******************************************/
116 /* private mpegts data */
118 /** structure to keep track of Program->pids mapping */
123 /** filters for various streams specified by PMT + for the PAT and PMT */
124 MpegTSFilter *pids[NB_PID_MAX];
127 static const AVOption options[] = {
128 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), FF_OPT_TYPE_INT,
129 {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
133 static const AVClass mpegtsraw_class = {
134 .class_name = "mpegtsraw demuxer",
135 .item_name = av_default_item_name,
137 .version = LIBAVUTIL_VERSION_INT,
140 /* TS stream handling */
145 MPEGTS_PESHEADER_FILL,
150 /* enough for PES header + length */
151 #define PES_START_SIZE 6
152 #define PES_HEADER_SIZE 9
153 #define MAX_PES_HEADER_SIZE (9 + 255)
155 typedef struct PESContext {
157 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
160 AVFormatContext *stream;
162 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
163 enum MpegTSState state;
164 /* used to get the format */
168 int extended_stream_id;
170 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
171 uint8_t header[MAX_PES_HEADER_SIZE];
175 extern AVInputFormat ff_mpegts_demuxer;
177 static void clear_program(MpegTSContext *ts, unsigned int programid)
181 for(i=0; i<ts->nb_prg; i++)
182 if(ts->prg[i].id == programid)
183 ts->prg[i].nb_pids = 0;
186 static void clear_programs(MpegTSContext *ts)
192 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
195 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
199 p = &ts->prg[ts->nb_prg];
205 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
208 struct Program *p = NULL;
209 for(i=0; i<ts->nb_prg; i++) {
210 if(ts->prg[i].id == programid) {
218 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
220 p->pids[p->nb_pids++] = pid;
224 * @brief discard_pid() decides if the pid is to be discarded according
225 * to caller's programs selection
226 * @param ts : - TS context
228 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
231 static int discard_pid(MpegTSContext *ts, unsigned int pid)
234 int used = 0, discarded = 0;
236 for(i=0; i<ts->nb_prg; i++) {
238 for(j=0; j<p->nb_pids; j++) {
239 if(p->pids[j] != pid)
241 //is program with id p->id set to be discarded?
242 for(k=0; k<ts->stream->nb_programs; k++) {
243 if(ts->stream->programs[k]->id == p->id) {
244 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
253 return !used && discarded;
257 * Assemble PES packets out of TS packets, and then call the "section_cb"
258 * function when they are complete.
260 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
261 const uint8_t *buf, int buf_size, int is_start)
263 MpegTSSectionFilter *tss = &tss1->u.section_filter;
267 memcpy(tss->section_buf, buf, buf_size);
268 tss->section_index = buf_size;
269 tss->section_h_size = -1;
270 tss->end_of_section_reached = 0;
272 if (tss->end_of_section_reached)
274 len = 4096 - tss->section_index;
277 memcpy(tss->section_buf + tss->section_index, buf, len);
278 tss->section_index += len;
281 /* compute section length if possible */
282 if (tss->section_h_size == -1 && tss->section_index >= 3) {
283 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
286 tss->section_h_size = len;
289 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
290 tss->end_of_section_reached = 1;
291 if (!tss->check_crc ||
292 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
293 tss->section_buf, tss->section_h_size) == 0)
294 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
298 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
299 SectionCallback *section_cb, void *opaque,
303 MpegTSFilter *filter;
304 MpegTSSectionFilter *sec;
306 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
308 if (pid >= NB_PID_MAX || ts->pids[pid])
310 filter = av_mallocz(sizeof(MpegTSFilter));
313 ts->pids[pid] = filter;
314 filter->type = MPEGTS_SECTION;
316 filter->last_cc = -1;
317 sec = &filter->u.section_filter;
318 sec->section_cb = section_cb;
319 sec->opaque = opaque;
320 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
321 sec->check_crc = check_crc;
322 if (!sec->section_buf) {
329 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
333 MpegTSFilter *filter;
334 MpegTSPESFilter *pes;
336 if (pid >= NB_PID_MAX || ts->pids[pid])
338 filter = av_mallocz(sizeof(MpegTSFilter));
341 ts->pids[pid] = filter;
342 filter->type = MPEGTS_PES;
344 filter->last_cc = -1;
345 pes = &filter->u.pes_filter;
346 pes->pes_cb = pes_cb;
347 pes->opaque = opaque;
351 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
356 if (filter->type == MPEGTS_SECTION)
357 av_freep(&filter->u.section_filter.section_buf);
358 else if (filter->type == MPEGTS_PES) {
359 PESContext *pes = filter->u.pes_filter.opaque;
360 av_freep(&pes->buffer);
361 /* referenced private data will be freed later in
362 * av_close_input_stream */
363 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
364 av_freep(&filter->u.pes_filter.opaque);
369 ts->pids[pid] = NULL;
372 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
373 int stat[TS_MAX_PACKET_SIZE];
378 memset(stat, 0, packet_size*sizeof(int));
380 for(x=i=0; i<size-3; i++){
381 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
383 if(stat[x] > best_score){
390 if(x == packet_size) x= 0;
396 /* autodetect fec presence. Must have at least 1024 bytes */
397 static int get_packet_size(const uint8_t *buf, int size)
399 int score, fec_score, dvhs_score;
401 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
404 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
405 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
406 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
407 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
409 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
410 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
411 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
415 typedef struct SectionHeader {
420 uint8_t last_sec_num;
423 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
436 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
442 if ((p + 1) >= p_end)
450 /* read and allocate a DVB string preceeded by its length */
451 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
458 len = get8(&p, p_end);
461 if ((p + len) > p_end)
463 str = av_malloc(len + 1);
473 static int parse_section_header(SectionHeader *h,
474 const uint8_t **pp, const uint8_t *p_end)
478 val = get8(pp, p_end);
483 val = get16(pp, p_end);
487 val = get8(pp, p_end);
490 h->version = (val >> 1) & 0x1f;
491 val = get8(pp, p_end);
495 val = get8(pp, p_end);
498 h->last_sec_num = val;
503 uint32_t stream_type;
504 enum AVMediaType codec_type;
505 enum CodecID codec_id;
508 static const StreamType ISO_types[] = {
509 { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
510 { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
511 { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
512 { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
513 { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
514 { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
515 { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
516 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
517 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
518 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
522 static const StreamType HDMV_types[] = {
523 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
524 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
525 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
526 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
527 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
528 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
533 static const StreamType MISC_types[] = {
534 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
535 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
539 static const StreamType REGD_types[] = {
540 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
541 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
542 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
546 /* descriptor present */
547 static const StreamType DESC_types[] = {
548 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
549 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
550 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
551 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
552 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
556 static void mpegts_find_stream_type(AVStream *st,
557 uint32_t stream_type, const StreamType *types)
559 for (; types->stream_type; types++) {
560 if (stream_type == types->stream_type) {
561 st->codec->codec_type = types->codec_type;
562 st->codec->codec_id = types->codec_id;
568 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
569 uint32_t stream_type, uint32_t prog_reg_desc)
571 av_set_pts_info(st, 33, 1, 90000);
573 st->codec->codec_type = AVMEDIA_TYPE_DATA;
574 st->codec->codec_id = CODEC_ID_NONE;
575 st->need_parsing = AVSTREAM_PARSE_FULL;
577 pes->stream_type = stream_type;
579 av_log(pes->stream, AV_LOG_DEBUG,
580 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
581 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
583 st->codec->codec_tag = pes->stream_type;
585 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
586 if (prog_reg_desc == AV_RL32("HDMV") &&
587 st->codec->codec_id == CODEC_ID_NONE) {
588 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
589 if (pes->stream_type == 0x83) {
590 // HDMV TrueHD streams also contain an AC3 coded version of the
591 // audio track - add a second stream for this
593 // priv_data cannot be shared between streams
594 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
596 return AVERROR(ENOMEM);
597 memcpy(sub_pes, pes, sizeof(*sub_pes));
599 sub_st = av_new_stream(pes->stream, pes->pid);
602 return AVERROR(ENOMEM);
605 av_set_pts_info(sub_st, 33, 1, 90000);
606 sub_st->priv_data = sub_pes;
607 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
608 sub_st->codec->codec_id = CODEC_ID_AC3;
609 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
610 sub_pes->sub_st = pes->sub_st = sub_st;
613 if (st->codec->codec_id == CODEC_ID_NONE)
614 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
619 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
623 pkt->destruct = av_destruct_packet;
624 pkt->data = pes->buffer;
625 pkt->size = pes->data_index;
626 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
628 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
629 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
630 pkt->stream_index = pes->sub_st->index;
632 pkt->stream_index = pes->st->index;
635 /* store position of first TS packet of this PES packet */
636 pkt->pos = pes->ts_packet_pos;
638 /* reset pts values */
639 pes->pts = AV_NOPTS_VALUE;
640 pes->dts = AV_NOPTS_VALUE;
645 /* return non zero if a packet could be constructed */
646 static int mpegts_push_data(MpegTSFilter *filter,
647 const uint8_t *buf, int buf_size, int is_start,
650 PESContext *pes = filter->u.pes_filter.opaque;
651 MpegTSContext *ts = pes->ts;
659 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
660 new_pes_packet(pes, ts->pkt);
663 pes->state = MPEGTS_HEADER;
665 pes->ts_packet_pos = pos;
668 while (buf_size > 0) {
671 len = PES_START_SIZE - pes->data_index;
674 memcpy(pes->header + pes->data_index, p, len);
675 pes->data_index += len;
678 if (pes->data_index == PES_START_SIZE) {
679 /* we got all the PES or section header. We can now
681 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
682 pes->header[2] == 0x01) {
683 /* it must be an mpeg2 PES stream */
684 code = pes->header[3] | 0x100;
685 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
687 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
688 code == 0x1be) /* padding_stream */
691 /* stream not present in PMT */
693 pes->st = av_new_stream(ts->stream, pes->pid);
695 return AVERROR(ENOMEM);
696 mpegts_set_stream_info(pes->st, pes, 0, 0);
699 pes->total_size = AV_RB16(pes->header + 4);
700 /* NOTE: a zero total size means the PES size is
702 if (!pes->total_size)
703 pes->total_size = MAX_PES_PAYLOAD;
705 /* allocate pes buffer */
706 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
708 return AVERROR(ENOMEM);
710 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
711 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
712 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
713 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
714 pes->state = MPEGTS_PESHEADER;
715 if (pes->st->codec->codec_id == CODEC_ID_NONE) {
716 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
717 pes->pid, pes->stream_type);
718 pes->st->codec->codec_id = CODEC_ID_PROBE;
721 pes->state = MPEGTS_PAYLOAD;
725 /* otherwise, it should be a table */
728 pes->state = MPEGTS_SKIP;
733 /**********************************************/
734 /* PES packing parsing */
735 case MPEGTS_PESHEADER:
736 len = PES_HEADER_SIZE - pes->data_index;
741 memcpy(pes->header + pes->data_index, p, len);
742 pes->data_index += len;
745 if (pes->data_index == PES_HEADER_SIZE) {
746 pes->pes_header_size = pes->header[8] + 9;
747 pes->state = MPEGTS_PESHEADER_FILL;
750 case MPEGTS_PESHEADER_FILL:
751 len = pes->pes_header_size - pes->data_index;
756 memcpy(pes->header + pes->data_index, p, len);
757 pes->data_index += len;
760 if (pes->data_index == pes->pes_header_size) {
762 unsigned int flags, pes_ext, skip;
764 flags = pes->header[7];
766 pes->pts = AV_NOPTS_VALUE;
767 pes->dts = AV_NOPTS_VALUE;
768 if ((flags & 0xc0) == 0x80) {
769 pes->dts = pes->pts = ff_parse_pes_pts(r);
771 } else if ((flags & 0xc0) == 0xc0) {
772 pes->pts = ff_parse_pes_pts(r);
774 pes->dts = ff_parse_pes_pts(r);
777 pes->extended_stream_id = -1;
778 if (flags & 0x01) { /* PES extension */
780 /* Skip PES private data, program packet sequence counter and P-STD buffer */
781 skip = (pes_ext >> 4) & 0xb;
784 if ((pes_ext & 0x41) == 0x01 &&
785 (r + 2) <= (pes->header + pes->pes_header_size)) {
786 /* PES extension 2 */
787 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
788 pes->extended_stream_id = r[1];
792 /* we got the full header. We parse it and get the payload */
793 pes->state = MPEGTS_PAYLOAD;
798 if (buf_size > 0 && pes->buffer) {
799 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
800 new_pes_packet(pes, ts->pkt);
801 pes->total_size = MAX_PES_PAYLOAD;
802 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
804 return AVERROR(ENOMEM);
806 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
807 // pes packet size is < ts size packet and pes data is padded with 0xff
808 // not sure if this is legal in ts but see issue #2392
809 buf_size = pes->total_size;
811 memcpy(pes->buffer+pes->data_index, p, buf_size);
812 pes->data_index += buf_size;
815 /* emit complete packets with known packet size
816 * decreases demuxer delay for infrequent packets like subtitles from
817 * a couple of seconds to milliseconds for properly muxed files.
818 * total_size is the number of bytes following pes_packet_length
819 * in the pes header, i.e. not counting the first 6 bytes */
820 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
821 pes->pes_header_size + pes->data_index == pes->total_size + 6) {
823 new_pes_packet(pes, ts->pkt);
835 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
840 /* if no pid found, then add a pid context */
841 pes = av_mallocz(sizeof(PESContext));
845 pes->stream = ts->stream;
847 pes->pcr_pid = pcr_pid;
848 pes->state = MPEGTS_SKIP;
849 pes->pts = AV_NOPTS_VALUE;
850 pes->dts = AV_NOPTS_VALUE;
851 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
859 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
860 int *es_id, uint8_t **dec_config_descr,
861 int *dec_config_descr_size)
867 ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
869 len = ff_mp4_read_descr(s, &pb, &tag);
870 if (tag == MP4IODescrTag) {
871 avio_rb16(&pb); // ID
877 len = ff_mp4_read_descr(s, &pb, &tag);
878 if (tag == MP4ESDescrTag) {
879 *es_id = avio_rb16(&pb); /* ES_ID */
880 av_dlog(s, "ES_ID %#x\n", *es_id);
881 avio_r8(&pb); /* priority */
882 len = ff_mp4_read_descr(s, &pb, &tag);
883 if (tag == MP4DecConfigDescrTag) {
884 *dec_config_descr = av_malloc(len);
885 if (!*dec_config_descr)
886 return AVERROR(ENOMEM);
887 *dec_config_descr_size = len;
888 avio_read(&pb, *dec_config_descr, len);
895 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
896 const uint8_t **pp, const uint8_t *desc_list_end,
897 int mp4_dec_config_descr_len, int mp4_es_id, int pid,
898 uint8_t *mp4_dec_config_descr)
900 const uint8_t *desc_end;
901 int desc_len, desc_tag;
905 desc_tag = get8(pp, desc_list_end);
908 desc_len = get8(pp, desc_list_end);
911 desc_end = *pp + desc_len;
912 if (desc_end > desc_list_end)
915 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
917 if (st->codec->codec_id == CODEC_ID_NONE &&
918 stream_type == STREAM_TYPE_PRIVATE_DATA)
919 mpegts_find_stream_type(st, desc_tag, DESC_types);
922 case 0x1F: /* FMC descriptor */
924 if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
925 mp4_dec_config_descr_len && mp4_es_id == pid) {
927 ffio_init_context(&pb, mp4_dec_config_descr,
928 mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
929 ff_mp4_read_dec_config_descr(fc, st, &pb);
930 if (st->codec->codec_id == CODEC_ID_AAC &&
931 st->codec->extradata_size > 0)
932 st->need_parsing = 0;
935 case 0x56: /* DVB teletext descriptor */
936 language[0] = get8(pp, desc_end);
937 language[1] = get8(pp, desc_end);
938 language[2] = get8(pp, desc_end);
940 av_dict_set(&st->metadata, "language", language, 0);
942 case 0x59: /* subtitling descriptor */
943 language[0] = get8(pp, desc_end);
944 language[1] = get8(pp, desc_end);
945 language[2] = get8(pp, desc_end);
947 /* hearing impaired subtitles detection */
948 switch(get8(pp, desc_end)) {
949 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
950 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
951 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
952 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
953 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
954 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
955 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
958 if (st->codec->extradata) {
959 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
960 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
962 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
963 if (st->codec->extradata) {
964 st->codec->extradata_size = 4;
965 memcpy(st->codec->extradata, *pp, 4);
969 av_dict_set(&st->metadata, "language", language, 0);
971 case 0x0a: /* ISO 639 language descriptor */
972 for (i = 0; i + 4 <= desc_len; i += 4) {
973 language[i + 0] = get8(pp, desc_end);
974 language[i + 1] = get8(pp, desc_end);
975 language[i + 2] = get8(pp, desc_end);
976 language[i + 3] = ',';
977 switch (get8(pp, desc_end)) {
978 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
979 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
980 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
985 av_dict_set(&st->metadata, "language", language, 0);
988 case 0x05: /* registration descriptor */
989 st->codec->codec_tag = bytestream_get_le32(pp);
990 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
991 if (st->codec->codec_id == CODEC_ID_NONE &&
992 stream_type == STREAM_TYPE_PRIVATE_DATA)
993 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1002 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1004 MpegTSContext *ts = filter->u.section_filter.opaque;
1005 SectionHeader h1, *h = &h1;
1008 const uint8_t *p, *p_end, *desc_list_end;
1009 int program_info_length, pcr_pid, pid, stream_type;
1011 uint32_t prog_reg_desc = 0; /* registration descriptor */
1012 uint8_t *mp4_dec_config_descr = NULL;
1013 int mp4_dec_config_descr_len = 0;
1016 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1017 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1019 p_end = section + section_len - 4;
1021 if (parse_section_header(h, &p, p_end) < 0)
1024 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1025 h->id, h->sec_num, h->last_sec_num);
1027 if (h->tid != PMT_TID)
1030 clear_program(ts, h->id);
1031 pcr_pid = get16(&p, p_end) & 0x1fff;
1034 add_pid_to_pmt(ts, h->id, pcr_pid);
1036 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1038 program_info_length = get16(&p, p_end) & 0xfff;
1039 if (program_info_length < 0)
1041 while(program_info_length >= 2) {
1043 tag = get8(&p, p_end);
1044 len = get8(&p, p_end);
1046 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1048 if(len > program_info_length - 2)
1049 //something else is broken, exit the program_descriptors_loop
1051 program_info_length -= len + 2;
1052 if (tag == 0x1d) { // IOD descriptor
1053 get8(&p, p_end); // scope
1054 get8(&p, p_end); // label
1056 mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1057 &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1058 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1059 prog_reg_desc = bytestream_get_le32(&p);
1064 p += program_info_length;
1068 // stop parsing after pmt, we found header
1069 if (!ts->stream->nb_streams)
1074 stream_type = get8(&p, p_end);
1075 if (stream_type < 0)
1077 pid = get16(&p, p_end) & 0x1fff;
1081 /* now create ffmpeg stream */
1082 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1083 pes = ts->pids[pid]->u.pes_filter.opaque;
1085 pes->st = av_new_stream(pes->stream, pes->pid);
1088 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1089 pes = add_pes_stream(ts, pid, pcr_pid);
1091 st = av_new_stream(pes->stream, pes->pid);
1097 if (!pes->stream_type)
1098 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1100 add_pid_to_pmt(ts, h->id, pid);
1102 ff_program_add_stream_index(ts->stream, h->id, st->index);
1104 desc_list_len = get16(&p, p_end) & 0xfff;
1105 if (desc_list_len < 0)
1107 desc_list_end = p + desc_list_len;
1108 if (desc_list_end > p_end)
1111 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1112 mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1115 if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1116 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1117 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1124 av_free(mp4_dec_config_descr);
1127 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1129 MpegTSContext *ts = filter->u.section_filter.opaque;
1130 SectionHeader h1, *h = &h1;
1131 const uint8_t *p, *p_end;
1134 av_dlog(ts->stream, "PAT:\n");
1135 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1137 p_end = section + section_len - 4;
1139 if (parse_section_header(h, &p, p_end) < 0)
1141 if (h->tid != PAT_TID)
1146 sid = get16(&p, p_end);
1149 pmt_pid = get16(&p, p_end) & 0x1fff;
1153 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1155 if (sid == 0x0000) {
1158 av_new_program(ts->stream, sid);
1159 if (ts->pids[pmt_pid])
1160 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1161 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1162 add_pat_entry(ts, sid);
1163 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1164 add_pid_to_pmt(ts, sid, pmt_pid);
1169 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1171 MpegTSContext *ts = filter->u.section_filter.opaque;
1172 SectionHeader h1, *h = &h1;
1173 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1174 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1175 char *name, *provider_name;
1177 av_dlog(ts->stream, "SDT:\n");
1178 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1180 p_end = section + section_len - 4;
1182 if (parse_section_header(h, &p, p_end) < 0)
1184 if (h->tid != SDT_TID)
1186 onid = get16(&p, p_end);
1189 val = get8(&p, p_end);
1193 sid = get16(&p, p_end);
1196 val = get8(&p, p_end);
1199 desc_list_len = get16(&p, p_end) & 0xfff;
1200 if (desc_list_len < 0)
1202 desc_list_end = p + desc_list_len;
1203 if (desc_list_end > p_end)
1206 desc_tag = get8(&p, desc_list_end);
1209 desc_len = get8(&p, desc_list_end);
1210 desc_end = p + desc_len;
1211 if (desc_end > desc_list_end)
1214 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1215 desc_tag, desc_len);
1219 service_type = get8(&p, p_end);
1220 if (service_type < 0)
1222 provider_name = getstr8(&p, p_end);
1225 name = getstr8(&p, p_end);
1227 AVProgram *program = av_new_program(ts->stream, sid);
1229 av_dict_set(&program->metadata, "service_name", name, 0);
1230 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1234 av_free(provider_name);
1245 /* handle one TS packet */
1246 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1248 AVFormatContext *s = ts->stream;
1250 int len, pid, cc, cc_ok, afc, is_start;
1251 const uint8_t *p, *p_end;
1254 pid = AV_RB16(packet + 1) & 0x1fff;
1255 if(pid && discard_pid(ts, pid))
1257 is_start = packet[1] & 0x40;
1258 tss = ts->pids[pid];
1259 if (ts->auto_guess && tss == NULL && is_start) {
1260 add_pes_stream(ts, pid, -1);
1261 tss = ts->pids[pid];
1266 /* continuity check (currently not used) */
1267 cc = (packet[3] & 0xf);
1268 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1271 /* skip adaptation field */
1272 afc = (packet[3] >> 4) & 3;
1274 if (afc == 0) /* reserved value */
1276 if (afc == 2) /* adaptation field only */
1279 /* skip adapation field */
1282 /* if past the end of packet, ignore */
1283 p_end = packet + TS_PACKET_SIZE;
1287 pos = avio_tell(ts->stream->pb);
1288 ts->pos47= pos % ts->raw_packet_size;
1290 if (tss->type == MPEGTS_SECTION) {
1292 /* pointer field present */
1294 if (p + len > p_end)
1297 /* write remaining section bytes */
1298 write_section_data(s, tss,
1300 /* check whether filter has been closed */
1306 write_section_data(s, tss,
1311 write_section_data(s, tss,
1317 // Note: The position here points actually behind the current packet.
1318 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1319 pos - ts->raw_packet_size)) < 0)
1326 /* XXX: try to find a better synchro over several packets (use
1327 get_packet_size() ?) */
1328 static int mpegts_resync(AVFormatContext *s)
1330 AVIOContext *pb = s->pb;
1333 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1335 if (pb->eof_reached)
1338 avio_seek(pb, -1, SEEK_CUR);
1342 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1347 /* return -1 if error or EOF. Return 0 if OK. */
1348 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1350 AVIOContext *pb = s->pb;
1354 len = avio_read(pb, buf, TS_PACKET_SIZE);
1355 if (len != TS_PACKET_SIZE)
1356 return len < 0 ? len : AVERROR_EOF;
1357 /* check paquet sync byte */
1358 if (buf[0] != 0x47) {
1359 /* find a new packet start */
1360 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1361 if (mpegts_resync(s) < 0)
1362 return AVERROR(EAGAIN);
1366 skip = raw_packet_size - TS_PACKET_SIZE;
1368 avio_skip(pb, skip);
1375 static int handle_packets(MpegTSContext *ts, int nb_packets)
1377 AVFormatContext *s = ts->stream;
1378 uint8_t packet[TS_PACKET_SIZE];
1379 int packet_num, ret;
1384 if (ts->stop_parse>0)
1387 if (nb_packets != 0 && packet_num >= nb_packets)
1389 ret = read_packet(s, packet, ts->raw_packet_size);
1392 ret = handle_packet(ts, packet);
1399 static int mpegts_probe(AVProbeData *p)
1402 const int size= p->buf_size;
1403 int score, fec_score, dvhs_score;
1404 int check_count= size / TS_FEC_PACKET_SIZE;
1405 #define CHECK_COUNT 10
1407 if (check_count < CHECK_COUNT)
1410 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1411 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1412 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1413 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1415 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1416 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1417 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1418 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1421 /* only use the extension for safer guess */
1422 if (av_match_ext(p->filename, "ts"))
1423 return AVPROBE_SCORE_MAX;
1429 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1430 (-1) if not available */
1431 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1432 const uint8_t *packet)
1434 int afc, len, flags;
1438 afc = (packet[3] >> 4) & 3;
1448 if (!(flags & 0x10))
1453 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1454 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1458 static int mpegts_read_header(AVFormatContext *s,
1459 AVFormatParameters *ap)
1461 MpegTSContext *ts = s->priv_data;
1462 AVIOContext *pb = s->pb;
1463 uint8_t buf[5*1024];
1467 #if FF_API_FORMAT_PARAMETERS
1469 if (ap->mpeg2ts_compute_pcr)
1470 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1471 if(ap->mpeg2ts_raw){
1472 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1478 /* read the first 1024 bytes to get packet size */
1479 pos = avio_tell(pb);
1480 len = avio_read(pb, buf, sizeof(buf));
1481 if (len != sizeof(buf))
1483 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1484 if (ts->raw_packet_size <= 0)
1489 if (s->iformat == &ff_mpegts_demuxer) {
1492 /* first do a scaning to get all the services */
1493 if (avio_seek(pb, pos, SEEK_SET) < 0)
1494 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1496 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1498 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1500 handle_packets(ts, s->probesize / ts->raw_packet_size);
1501 /* if could not find service, enable auto_guess */
1505 av_dlog(ts->stream, "tuning done\n");
1507 s->ctx_flags |= AVFMTCTX_NOHEADER;
1510 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1511 int64_t pcrs[2], pcr_h;
1512 int packet_count[2];
1513 uint8_t packet[TS_PACKET_SIZE];
1515 /* only read packets */
1517 st = av_new_stream(s, 0);
1520 av_set_pts_info(st, 60, 1, 27000000);
1521 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1522 st->codec->codec_id = CODEC_ID_MPEG2TS;
1524 /* we iterate until we find two PCRs to estimate the bitrate */
1529 ret = read_packet(s, packet, ts->raw_packet_size);
1532 pid = AV_RB16(packet + 1) & 0x1fff;
1533 if ((pcr_pid == -1 || pcr_pid == pid) &&
1534 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1536 packet_count[nb_pcrs] = nb_packets;
1537 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1545 /* NOTE1: the bitrate is computed without the FEC */
1546 /* NOTE2: it is only the bitrate of the start of the stream */
1547 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1548 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1549 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1550 st->codec->bit_rate = s->bit_rate;
1551 st->start_time = ts->cur_pcr;
1552 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1553 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1556 avio_seek(pb, pos, SEEK_SET);
1562 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1564 static int mpegts_raw_read_packet(AVFormatContext *s,
1567 MpegTSContext *ts = s->priv_data;
1569 int64_t pcr_h, next_pcr_h, pos;
1570 int pcr_l, next_pcr_l;
1571 uint8_t pcr_buf[12];
1573 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1574 return AVERROR(ENOMEM);
1575 pkt->pos= avio_tell(s->pb);
1576 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1578 av_free_packet(pkt);
1581 if (ts->mpeg2ts_compute_pcr) {
1582 /* compute exact PCR for each packet */
1583 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1584 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1585 pos = avio_tell(s->pb);
1586 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1587 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1588 avio_read(s->pb, pcr_buf, 12);
1589 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1590 /* XXX: not precise enough */
1591 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1596 avio_seek(s->pb, pos, SEEK_SET);
1597 /* no next PCR found: we use previous increment */
1598 ts->cur_pcr = pcr_h * 300 + pcr_l;
1600 pkt->pts = ts->cur_pcr;
1601 pkt->duration = ts->pcr_incr;
1602 ts->cur_pcr += ts->pcr_incr;
1604 pkt->stream_index = 0;
1608 static int mpegts_read_packet(AVFormatContext *s,
1611 MpegTSContext *ts = s->priv_data;
1614 if (avio_tell(s->pb) != ts->last_pos) {
1615 /* seek detected, flush pes buffer */
1616 for (i = 0; i < NB_PID_MAX; i++) {
1617 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1618 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1619 av_freep(&pes->buffer);
1620 pes->data_index = 0;
1621 pes->state = MPEGTS_SKIP; /* skip until pes header */
1627 ret = handle_packets(ts, 0);
1629 /* flush pes data left */
1630 for (i = 0; i < NB_PID_MAX; i++) {
1631 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1632 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1633 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1634 new_pes_packet(pes, pkt);
1635 pes->state = MPEGTS_SKIP;
1643 ts->last_pos = avio_tell(s->pb);
1648 static int mpegts_read_close(AVFormatContext *s)
1650 MpegTSContext *ts = s->priv_data;
1655 for(i=0;i<NB_PID_MAX;i++)
1656 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1661 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1662 int64_t *ppos, int64_t pos_limit)
1664 MpegTSContext *ts = s->priv_data;
1665 int64_t pos, timestamp;
1666 uint8_t buf[TS_PACKET_SIZE];
1667 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1668 const int find_next= 1;
1669 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1672 avio_seek(s->pb, pos, SEEK_SET);
1673 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1674 return AV_NOPTS_VALUE;
1675 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1676 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1679 pos += ts->raw_packet_size;
1683 pos -= ts->raw_packet_size;
1685 return AV_NOPTS_VALUE;
1686 avio_seek(s->pb, pos, SEEK_SET);
1687 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1688 return AV_NOPTS_VALUE;
1689 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1690 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1700 #ifdef USE_SYNCPOINT_SEARCH
1702 static int read_seek2(AVFormatContext *s,
1711 int64_t ts_ret, ts_adj;
1712 int stream_index_gen_search;
1714 AVParserState *backup;
1716 backup = ff_store_parser_state(s);
1718 // detect direction of seeking for search purposes
1719 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1720 AVSEEK_FLAG_BACKWARD : 0;
1722 if (flags & AVSEEK_FLAG_BYTE) {
1723 // use position directly, we will search starting from it
1726 // search for some position with good timestamp match
1727 if (stream_index < 0) {
1728 stream_index_gen_search = av_find_default_stream_index(s);
1729 if (stream_index_gen_search < 0) {
1730 ff_restore_parser_state(s, backup);
1734 st = s->streams[stream_index_gen_search];
1735 // timestamp for default must be expressed in AV_TIME_BASE units
1736 ts_adj = av_rescale(target_ts,
1738 AV_TIME_BASE * (int64_t)st->time_base.num);
1741 stream_index_gen_search = stream_index;
1743 pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1747 flags, &ts_ret, mpegts_get_pcr);
1749 ff_restore_parser_state(s, backup);
1754 // search for actual matching keyframe/starting position for all streams
1755 if (ff_gen_syncpoint_search(s, stream_index, pos,
1756 min_ts, target_ts, max_ts,
1758 ff_restore_parser_state(s, backup);
1762 ff_free_parser_state(s, backup);
1766 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1769 if (flags & AVSEEK_FLAG_BACKWARD) {
1770 flags &= ~AVSEEK_FLAG_BACKWARD;
1771 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1773 // for compatibility reasons, seek to the best-fitting timestamp
1774 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1776 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1778 // for compatibility reasons, seek to the best-fitting timestamp
1779 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1786 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1787 MpegTSContext *ts = s->priv_data;
1788 uint8_t buf[TS_PACKET_SIZE];
1791 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1794 pos= avio_tell(s->pb);
1797 avio_seek(s->pb, pos, SEEK_SET);
1798 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1800 // pid = AV_RB16(buf + 1) & 0x1fff;
1801 if(buf[1] & 0x40) break;
1802 pos += ts->raw_packet_size;
1804 avio_seek(s->pb, pos, SEEK_SET);
1811 /**************************************************************/
1812 /* parsing functions - called from other demuxers such as RTP */
1814 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1818 ts = av_mallocz(sizeof(MpegTSContext));
1821 /* no stream case, currently used by RTP */
1822 ts->raw_packet_size = TS_PACKET_SIZE;
1828 /* return the consumed length if a packet was output, or -1 if no
1830 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1831 const uint8_t *buf, int len)
1839 if (ts->stop_parse>0)
1841 if (len < TS_PACKET_SIZE)
1843 if (buf[0] != 0x47) {
1847 handle_packet(ts, buf);
1848 buf += TS_PACKET_SIZE;
1849 len -= TS_PACKET_SIZE;
1855 void ff_mpegts_parse_close(MpegTSContext *ts)
1859 for(i=0;i<NB_PID_MAX;i++)
1860 av_free(ts->pids[i]);
1864 AVInputFormat ff_mpegts_demuxer = {
1866 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1867 sizeof(MpegTSContext),
1874 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1875 #ifdef USE_SYNCPOINT_SEARCH
1876 .read_seek2 = read_seek2,
1880 AVInputFormat ff_mpegtsraw_demuxer = {
1882 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1883 sizeof(MpegTSContext),
1886 mpegts_raw_read_packet,
1890 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1891 #ifdef USE_SYNCPOINT_SEARCH
1892 .read_seek2 = read_seek2,
1894 .priv_class = &mpegtsraw_class,