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/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;
223 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
226 for(i=0; i<s->nb_programs; i++) {
227 if(s->programs[i]->id == programid) {
228 s->programs[i]->pcr_pid = pid;
235 * \brief discard_pid() decides if the pid is to be discarded according
236 * to caller's programs selection
237 * \param ts : - TS context
239 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
242 static int discard_pid(MpegTSContext *ts, unsigned int pid)
245 int used = 0, discarded = 0;
247 for(i=0; i<ts->nb_prg; i++) {
249 for(j=0; j<p->nb_pids; j++) {
250 if(p->pids[j] != pid)
252 //is program with id p->id set to be discarded?
253 for(k=0; k<ts->stream->nb_programs; k++) {
254 if(ts->stream->programs[k]->id == p->id) {
255 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
264 return !used && discarded;
268 * Assemble PES packets out of TS packets, and then call the "section_cb"
269 * function when they are complete.
271 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
272 const uint8_t *buf, int buf_size, int is_start)
274 MpegTSSectionFilter *tss = &tss1->u.section_filter;
278 memcpy(tss->section_buf, buf, buf_size);
279 tss->section_index = buf_size;
280 tss->section_h_size = -1;
281 tss->end_of_section_reached = 0;
283 if (tss->end_of_section_reached)
285 len = 4096 - tss->section_index;
288 memcpy(tss->section_buf + tss->section_index, buf, len);
289 tss->section_index += len;
292 /* compute section length if possible */
293 if (tss->section_h_size == -1 && tss->section_index >= 3) {
294 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
297 tss->section_h_size = len;
300 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
301 tss->end_of_section_reached = 1;
302 if (!tss->check_crc ||
303 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
304 tss->section_buf, tss->section_h_size) == 0)
305 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
309 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
310 SectionCallback *section_cb, void *opaque,
314 MpegTSFilter *filter;
315 MpegTSSectionFilter *sec;
317 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
319 if (pid >= NB_PID_MAX || ts->pids[pid])
321 filter = av_mallocz(sizeof(MpegTSFilter));
324 ts->pids[pid] = filter;
325 filter->type = MPEGTS_SECTION;
327 filter->last_cc = -1;
328 sec = &filter->u.section_filter;
329 sec->section_cb = section_cb;
330 sec->opaque = opaque;
331 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
332 sec->check_crc = check_crc;
333 if (!sec->section_buf) {
340 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
344 MpegTSFilter *filter;
345 MpegTSPESFilter *pes;
347 if (pid >= NB_PID_MAX || ts->pids[pid])
349 filter = av_mallocz(sizeof(MpegTSFilter));
352 ts->pids[pid] = filter;
353 filter->type = MPEGTS_PES;
355 filter->last_cc = -1;
356 pes = &filter->u.pes_filter;
357 pes->pes_cb = pes_cb;
358 pes->opaque = opaque;
362 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
367 if (filter->type == MPEGTS_SECTION)
368 av_freep(&filter->u.section_filter.section_buf);
369 else if (filter->type == MPEGTS_PES) {
370 PESContext *pes = filter->u.pes_filter.opaque;
371 av_freep(&pes->buffer);
372 /* referenced private data will be freed later in
373 * av_close_input_stream */
374 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
375 av_freep(&filter->u.pes_filter.opaque);
380 ts->pids[pid] = NULL;
383 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
384 int stat[TS_MAX_PACKET_SIZE];
389 memset(stat, 0, packet_size*sizeof(int));
391 for(x=i=0; i<size-3; i++){
392 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
394 if(stat[x] > best_score){
401 if(x == packet_size) x= 0;
407 /* autodetect fec presence. Must have at least 1024 bytes */
408 static int get_packet_size(const uint8_t *buf, int size)
410 int score, fec_score, dvhs_score;
412 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
415 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
416 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
417 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
418 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
420 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
421 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
422 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
426 typedef struct SectionHeader {
431 uint8_t last_sec_num;
434 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
447 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
453 if ((p + 1) >= p_end)
461 /* read and allocate a DVB string preceeded by its length */
462 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
469 len = get8(&p, p_end);
472 if ((p + len) > p_end)
474 str = av_malloc(len + 1);
484 static int parse_section_header(SectionHeader *h,
485 const uint8_t **pp, const uint8_t *p_end)
489 val = get8(pp, p_end);
494 val = get16(pp, p_end);
498 val = get8(pp, p_end);
501 h->version = (val >> 1) & 0x1f;
502 val = get8(pp, p_end);
506 val = get8(pp, p_end);
509 h->last_sec_num = val;
514 uint32_t stream_type;
515 enum AVMediaType codec_type;
516 enum CodecID codec_id;
519 static const StreamType ISO_types[] = {
520 { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
521 { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
522 { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
523 { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
524 { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
525 { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
526 { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
527 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
528 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
529 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
533 static const StreamType HDMV_types[] = {
534 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
535 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
536 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
537 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
538 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
539 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
544 static const StreamType MISC_types[] = {
545 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
546 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
550 static const StreamType REGD_types[] = {
551 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
552 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
553 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
557 /* descriptor present */
558 static const StreamType DESC_types[] = {
559 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
560 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
561 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
562 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
563 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
567 static void mpegts_find_stream_type(AVStream *st,
568 uint32_t stream_type, const StreamType *types)
570 for (; types->stream_type; types++) {
571 if (stream_type == types->stream_type) {
572 st->codec->codec_type = types->codec_type;
573 st->codec->codec_id = types->codec_id;
574 st->request_probe = 0;
580 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
581 uint32_t stream_type, uint32_t prog_reg_desc)
583 av_set_pts_info(st, 33, 1, 90000);
585 st->codec->codec_type = AVMEDIA_TYPE_DATA;
586 st->codec->codec_id = CODEC_ID_NONE;
587 st->need_parsing = AVSTREAM_PARSE_FULL;
589 pes->stream_type = stream_type;
591 av_log(pes->stream, AV_LOG_DEBUG,
592 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
593 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
595 st->codec->codec_tag = pes->stream_type;
597 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
598 if (prog_reg_desc == AV_RL32("HDMV") &&
599 st->codec->codec_id == CODEC_ID_NONE) {
600 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
601 if (pes->stream_type == 0x83) {
602 // HDMV TrueHD streams also contain an AC3 coded version of the
603 // audio track - add a second stream for this
605 // priv_data cannot be shared between streams
606 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
608 return AVERROR(ENOMEM);
609 memcpy(sub_pes, pes, sizeof(*sub_pes));
611 sub_st = av_new_stream(pes->stream, pes->pid);
614 return AVERROR(ENOMEM);
617 av_set_pts_info(sub_st, 33, 1, 90000);
618 sub_st->priv_data = sub_pes;
619 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
620 sub_st->codec->codec_id = CODEC_ID_AC3;
621 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
622 sub_pes->sub_st = pes->sub_st = sub_st;
625 if (st->codec->codec_id == CODEC_ID_NONE)
626 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
631 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
635 pkt->destruct = av_destruct_packet;
636 pkt->data = pes->buffer;
637 pkt->size = pes->data_index;
638 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
640 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
641 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
642 pkt->stream_index = pes->sub_st->index;
644 pkt->stream_index = pes->st->index;
647 /* store position of first TS packet of this PES packet */
648 pkt->pos = pes->ts_packet_pos;
650 /* reset pts values */
651 pes->pts = AV_NOPTS_VALUE;
652 pes->dts = AV_NOPTS_VALUE;
657 /* return non zero if a packet could be constructed */
658 static int mpegts_push_data(MpegTSFilter *filter,
659 const uint8_t *buf, int buf_size, int is_start,
662 PESContext *pes = filter->u.pes_filter.opaque;
663 MpegTSContext *ts = pes->ts;
671 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
672 new_pes_packet(pes, ts->pkt);
675 pes->state = MPEGTS_HEADER;
677 pes->ts_packet_pos = pos;
680 while (buf_size > 0) {
683 len = PES_START_SIZE - pes->data_index;
686 memcpy(pes->header + pes->data_index, p, len);
687 pes->data_index += len;
690 if (pes->data_index == PES_START_SIZE) {
691 /* we got all the PES or section header. We can now
693 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
694 pes->header[2] == 0x01) {
695 /* it must be an mpeg2 PES stream */
696 code = pes->header[3] | 0x100;
697 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
699 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
700 code == 0x1be) /* padding_stream */
703 /* stream not present in PMT */
705 pes->st = av_new_stream(ts->stream, pes->pid);
707 return AVERROR(ENOMEM);
708 mpegts_set_stream_info(pes->st, pes, 0, 0);
711 pes->total_size = AV_RB16(pes->header + 4);
712 /* NOTE: a zero total size means the PES size is
714 if (!pes->total_size)
715 pes->total_size = MAX_PES_PAYLOAD;
717 /* allocate pes buffer */
718 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
720 return AVERROR(ENOMEM);
722 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
723 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
724 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
725 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
726 pes->state = MPEGTS_PESHEADER;
727 if (pes->st->codec->codec_id == CODEC_ID_NONE && !pes->st->request_probe) {
728 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
729 pes->pid, pes->stream_type);
730 pes->st->request_probe= 1;
733 pes->state = MPEGTS_PAYLOAD;
737 /* otherwise, it should be a table */
740 pes->state = MPEGTS_SKIP;
745 /**********************************************/
746 /* PES packing parsing */
747 case MPEGTS_PESHEADER:
748 len = PES_HEADER_SIZE - pes->data_index;
753 memcpy(pes->header + pes->data_index, p, len);
754 pes->data_index += len;
757 if (pes->data_index == PES_HEADER_SIZE) {
758 pes->pes_header_size = pes->header[8] + 9;
759 pes->state = MPEGTS_PESHEADER_FILL;
762 case MPEGTS_PESHEADER_FILL:
763 len = pes->pes_header_size - pes->data_index;
768 memcpy(pes->header + pes->data_index, p, len);
769 pes->data_index += len;
772 if (pes->data_index == pes->pes_header_size) {
774 unsigned int flags, pes_ext, skip;
776 flags = pes->header[7];
778 pes->pts = AV_NOPTS_VALUE;
779 pes->dts = AV_NOPTS_VALUE;
780 if ((flags & 0xc0) == 0x80) {
781 pes->dts = pes->pts = ff_parse_pes_pts(r);
783 } else if ((flags & 0xc0) == 0xc0) {
784 pes->pts = ff_parse_pes_pts(r);
786 pes->dts = ff_parse_pes_pts(r);
789 pes->extended_stream_id = -1;
790 if (flags & 0x01) { /* PES extension */
792 /* Skip PES private data, program packet sequence counter and P-STD buffer */
793 skip = (pes_ext >> 4) & 0xb;
796 if ((pes_ext & 0x41) == 0x01 &&
797 (r + 2) <= (pes->header + pes->pes_header_size)) {
798 /* PES extension 2 */
799 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
800 pes->extended_stream_id = r[1];
804 /* we got the full header. We parse it and get the payload */
805 pes->state = MPEGTS_PAYLOAD;
810 if (buf_size > 0 && pes->buffer) {
811 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
812 new_pes_packet(pes, ts->pkt);
813 pes->total_size = MAX_PES_PAYLOAD;
814 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
816 return AVERROR(ENOMEM);
818 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
819 // pes packet size is < ts size packet and pes data is padded with 0xff
820 // not sure if this is legal in ts but see issue #2392
821 buf_size = pes->total_size;
823 memcpy(pes->buffer+pes->data_index, p, buf_size);
824 pes->data_index += buf_size;
827 /* emit complete packets with known packet size
828 * decreases demuxer delay for infrequent packets like subtitles from
829 * a couple of seconds to milliseconds for properly muxed files.
830 * total_size is the number of bytes following pes_packet_length
831 * in the pes header, i.e. not counting the first 6 bytes */
832 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
833 pes->pes_header_size + pes->data_index == pes->total_size + 6) {
835 new_pes_packet(pes, ts->pkt);
847 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
852 /* if no pid found, then add a pid context */
853 pes = av_mallocz(sizeof(PESContext));
857 pes->stream = ts->stream;
859 pes->pcr_pid = pcr_pid;
860 pes->state = MPEGTS_SKIP;
861 pes->pts = AV_NOPTS_VALUE;
862 pes->dts = AV_NOPTS_VALUE;
863 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
871 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
872 int *es_id, uint8_t **dec_config_descr,
873 int *dec_config_descr_size)
879 ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
881 len = ff_mp4_read_descr(s, &pb, &tag);
882 if (tag == MP4IODescrTag) {
883 avio_rb16(&pb); // ID
889 len = ff_mp4_read_descr(s, &pb, &tag);
890 if (tag == MP4ESDescrTag) {
891 *es_id = avio_rb16(&pb); /* ES_ID */
892 av_dlog(s, "ES_ID %#x\n", *es_id);
893 avio_r8(&pb); /* priority */
894 len = ff_mp4_read_descr(s, &pb, &tag);
895 if (tag == MP4DecConfigDescrTag) {
896 *dec_config_descr = av_malloc(len);
897 if (!*dec_config_descr)
898 return AVERROR(ENOMEM);
899 *dec_config_descr_size = len;
900 avio_read(&pb, *dec_config_descr, len);
907 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
908 const uint8_t **pp, const uint8_t *desc_list_end,
909 int mp4_dec_config_descr_len, int mp4_es_id, int pid,
910 uint8_t *mp4_dec_config_descr)
912 const uint8_t *desc_end;
913 int desc_len, desc_tag;
917 desc_tag = get8(pp, desc_list_end);
920 desc_len = get8(pp, desc_list_end);
923 desc_end = *pp + desc_len;
924 if (desc_end > desc_list_end)
927 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
929 if (st->codec->codec_id == CODEC_ID_NONE &&
930 stream_type == STREAM_TYPE_PRIVATE_DATA)
931 mpegts_find_stream_type(st, desc_tag, DESC_types);
934 case 0x1F: /* FMC descriptor */
936 if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
937 mp4_dec_config_descr_len && mp4_es_id == pid) {
939 ffio_init_context(&pb, mp4_dec_config_descr,
940 mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
941 ff_mp4_read_dec_config_descr(fc, st, &pb);
942 if (st->codec->codec_id == CODEC_ID_AAC &&
943 st->codec->extradata_size > 0)
944 st->need_parsing = 0;
947 case 0x56: /* DVB teletext descriptor */
948 language[0] = get8(pp, desc_end);
949 language[1] = get8(pp, desc_end);
950 language[2] = get8(pp, desc_end);
952 av_dict_set(&st->metadata, "language", language, 0);
954 case 0x59: /* subtitling descriptor */
955 language[0] = get8(pp, desc_end);
956 language[1] = get8(pp, desc_end);
957 language[2] = get8(pp, desc_end);
959 /* hearing impaired subtitles detection */
960 switch(get8(pp, desc_end)) {
961 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
962 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
963 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
964 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
965 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
966 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
967 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
970 if (st->codec->extradata) {
971 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
972 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
974 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
975 if (st->codec->extradata) {
976 st->codec->extradata_size = 4;
977 memcpy(st->codec->extradata, *pp, 4);
981 av_dict_set(&st->metadata, "language", language, 0);
983 case 0x0a: /* ISO 639 language descriptor */
984 for (i = 0; i + 4 <= desc_len; i += 4) {
985 language[i + 0] = get8(pp, desc_end);
986 language[i + 1] = get8(pp, desc_end);
987 language[i + 2] = get8(pp, desc_end);
988 language[i + 3] = ',';
989 switch (get8(pp, desc_end)) {
990 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
991 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
992 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
997 av_dict_set(&st->metadata, "language", language, 0);
1000 case 0x05: /* registration descriptor */
1001 st->codec->codec_tag = bytestream_get_le32(pp);
1002 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1003 if (st->codec->codec_id == CODEC_ID_NONE &&
1004 stream_type == STREAM_TYPE_PRIVATE_DATA)
1005 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1007 case 0x52: /* stream identifier descriptor */
1008 st->stream_identifier = 1 + get8(pp, desc_end);
1017 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1019 MpegTSContext *ts = filter->u.section_filter.opaque;
1020 SectionHeader h1, *h = &h1;
1023 const uint8_t *p, *p_end, *desc_list_end;
1024 int program_info_length, pcr_pid, pid, stream_type;
1026 uint32_t prog_reg_desc = 0; /* registration descriptor */
1027 uint8_t *mp4_dec_config_descr = NULL;
1028 int mp4_dec_config_descr_len = 0;
1031 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1032 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1034 p_end = section + section_len - 4;
1036 if (parse_section_header(h, &p, p_end) < 0)
1039 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1040 h->id, h->sec_num, h->last_sec_num);
1042 if (h->tid != PMT_TID)
1045 clear_program(ts, h->id);
1046 pcr_pid = get16(&p, p_end) & 0x1fff;
1049 add_pid_to_pmt(ts, h->id, pcr_pid);
1050 set_pcr_pid(ts->stream, h->id, pcr_pid);
1052 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1054 program_info_length = get16(&p, p_end) & 0xfff;
1055 if (program_info_length < 0)
1057 while(program_info_length >= 2) {
1059 tag = get8(&p, p_end);
1060 len = get8(&p, p_end);
1062 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1064 if(len > program_info_length - 2)
1065 //something else is broken, exit the program_descriptors_loop
1067 program_info_length -= len + 2;
1068 if (tag == 0x1d) { // IOD descriptor
1069 get8(&p, p_end); // scope
1070 get8(&p, p_end); // label
1072 mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1073 &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1074 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1075 prog_reg_desc = bytestream_get_le32(&p);
1080 p += program_info_length;
1084 // stop parsing after pmt, we found header
1085 if (!ts->stream->nb_streams)
1090 stream_type = get8(&p, p_end);
1091 if (stream_type < 0)
1093 pid = get16(&p, p_end) & 0x1fff;
1097 /* now create ffmpeg stream */
1098 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1099 pes = ts->pids[pid]->u.pes_filter.opaque;
1101 pes->st = av_new_stream(pes->stream, pes->pid);
1104 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1105 pes = add_pes_stream(ts, pid, pcr_pid);
1107 st = av_new_stream(pes->stream, pes->pid);
1113 if (!pes->stream_type)
1114 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1116 add_pid_to_pmt(ts, h->id, pid);
1118 ff_program_add_stream_index(ts->stream, h->id, st->index);
1120 desc_list_len = get16(&p, p_end) & 0xfff;
1121 if (desc_list_len < 0)
1123 desc_list_end = p + desc_list_len;
1124 if (desc_list_end > p_end)
1127 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1128 mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1131 if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1132 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1133 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1140 av_free(mp4_dec_config_descr);
1143 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1145 MpegTSContext *ts = filter->u.section_filter.opaque;
1146 SectionHeader h1, *h = &h1;
1147 const uint8_t *p, *p_end;
1151 av_dlog(ts->stream, "PAT:\n");
1152 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1154 p_end = section + section_len - 4;
1156 if (parse_section_header(h, &p, p_end) < 0)
1158 if (h->tid != PAT_TID)
1161 ts->stream->ts_id = h->id;
1165 sid = get16(&p, p_end);
1168 pmt_pid = get16(&p, p_end) & 0x1fff;
1172 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1174 if (sid == 0x0000) {
1177 program = av_new_program(ts->stream, sid);
1178 program->program_num = sid;
1179 program->pmt_pid = pmt_pid;
1180 if (ts->pids[pmt_pid])
1181 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1182 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1183 add_pat_entry(ts, sid);
1184 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1185 add_pid_to_pmt(ts, sid, pmt_pid);
1190 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1192 MpegTSContext *ts = filter->u.section_filter.opaque;
1193 SectionHeader h1, *h = &h1;
1194 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1195 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1196 char *name, *provider_name;
1198 av_dlog(ts->stream, "SDT:\n");
1199 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1201 p_end = section + section_len - 4;
1203 if (parse_section_header(h, &p, p_end) < 0)
1205 if (h->tid != SDT_TID)
1207 onid = get16(&p, p_end);
1210 val = get8(&p, p_end);
1214 sid = get16(&p, p_end);
1217 val = get8(&p, p_end);
1220 desc_list_len = get16(&p, p_end) & 0xfff;
1221 if (desc_list_len < 0)
1223 desc_list_end = p + desc_list_len;
1224 if (desc_list_end > p_end)
1227 desc_tag = get8(&p, desc_list_end);
1230 desc_len = get8(&p, desc_list_end);
1231 desc_end = p + desc_len;
1232 if (desc_end > desc_list_end)
1235 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1236 desc_tag, desc_len);
1240 service_type = get8(&p, p_end);
1241 if (service_type < 0)
1243 provider_name = getstr8(&p, p_end);
1246 name = getstr8(&p, p_end);
1248 AVProgram *program = av_new_program(ts->stream, sid);
1250 av_dict_set(&program->metadata, "service_name", name, 0);
1251 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1255 av_free(provider_name);
1266 /* handle one TS packet */
1267 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1269 AVFormatContext *s = ts->stream;
1271 int len, pid, cc, cc_ok, afc, is_start;
1272 const uint8_t *p, *p_end;
1275 pid = AV_RB16(packet + 1) & 0x1fff;
1276 if(pid && discard_pid(ts, pid))
1278 is_start = packet[1] & 0x40;
1279 tss = ts->pids[pid];
1280 if (ts->auto_guess && tss == NULL && is_start) {
1281 add_pes_stream(ts, pid, -1);
1282 tss = ts->pids[pid];
1287 /* continuity check (currently not used) */
1288 cc = (packet[3] & 0xf);
1289 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1292 /* skip adaptation field */
1293 afc = (packet[3] >> 4) & 3;
1295 if (afc == 0) /* reserved value */
1297 if (afc == 2) /* adaptation field only */
1300 /* skip adapation field */
1303 /* if past the end of packet, ignore */
1304 p_end = packet + TS_PACKET_SIZE;
1308 pos = avio_tell(ts->stream->pb);
1309 ts->pos47= pos % ts->raw_packet_size;
1311 if (tss->type == MPEGTS_SECTION) {
1313 /* pointer field present */
1315 if (p + len > p_end)
1318 /* write remaining section bytes */
1319 write_section_data(s, tss,
1321 /* check whether filter has been closed */
1327 write_section_data(s, tss,
1332 write_section_data(s, tss,
1338 // Note: The position here points actually behind the current packet.
1339 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1340 pos - ts->raw_packet_size)) < 0)
1347 /* XXX: try to find a better synchro over several packets (use
1348 get_packet_size() ?) */
1349 static int mpegts_resync(AVFormatContext *s)
1351 AVIOContext *pb = s->pb;
1354 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1359 avio_seek(pb, -1, SEEK_CUR);
1363 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1368 /* return -1 if error or EOF. Return 0 if OK. */
1369 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1371 AVIOContext *pb = s->pb;
1375 len = avio_read(pb, buf, TS_PACKET_SIZE);
1376 if (len != TS_PACKET_SIZE)
1377 return len < 0 ? len : AVERROR_EOF;
1378 /* check paquet sync byte */
1379 if (buf[0] != 0x47) {
1380 /* find a new packet start */
1381 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1382 if (mpegts_resync(s) < 0)
1383 return AVERROR(EAGAIN);
1387 skip = raw_packet_size - TS_PACKET_SIZE;
1389 avio_skip(pb, skip);
1396 static int handle_packets(MpegTSContext *ts, int nb_packets)
1398 AVFormatContext *s = ts->stream;
1399 uint8_t packet[TS_PACKET_SIZE];
1400 int packet_num, ret;
1405 if (ts->stop_parse>0)
1408 if (nb_packets != 0 && packet_num >= nb_packets)
1410 ret = read_packet(s, packet, ts->raw_packet_size);
1413 ret = handle_packet(ts, packet);
1420 static int mpegts_probe(AVProbeData *p)
1423 const int size= p->buf_size;
1424 int score, fec_score, dvhs_score;
1425 int check_count= size / TS_FEC_PACKET_SIZE;
1426 #define CHECK_COUNT 10
1428 if (check_count < CHECK_COUNT)
1431 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1432 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1433 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1434 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1436 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1437 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1438 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1439 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1442 /* only use the extension for safer guess */
1443 if (av_match_ext(p->filename, "ts"))
1444 return AVPROBE_SCORE_MAX;
1450 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1451 (-1) if not available */
1452 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1453 const uint8_t *packet)
1455 int afc, len, flags;
1459 afc = (packet[3] >> 4) & 3;
1469 if (!(flags & 0x10))
1474 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1475 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1479 static int mpegts_read_header(AVFormatContext *s,
1480 AVFormatParameters *ap)
1482 MpegTSContext *ts = s->priv_data;
1483 AVIOContext *pb = s->pb;
1484 uint8_t buf[8*1024];
1488 #if FF_API_FORMAT_PARAMETERS
1490 if (ap->mpeg2ts_compute_pcr)
1491 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1492 if(ap->mpeg2ts_raw){
1493 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1499 /* read the first 1024 bytes to get packet size */
1500 pos = avio_tell(pb);
1501 len = avio_read(pb, buf, sizeof(buf));
1502 if (len != sizeof(buf))
1504 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1505 if (ts->raw_packet_size <= 0) {
1506 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1507 ts->raw_packet_size = TS_PACKET_SIZE;
1512 if (s->iformat == &ff_mpegts_demuxer) {
1515 /* first do a scaning to get all the services */
1516 if (avio_seek(pb, pos, SEEK_SET) < 0)
1517 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1519 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1521 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1523 handle_packets(ts, s->probesize / ts->raw_packet_size);
1524 /* if could not find service, enable auto_guess */
1528 av_dlog(ts->stream, "tuning done\n");
1530 s->ctx_flags |= AVFMTCTX_NOHEADER;
1533 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1534 int64_t pcrs[2], pcr_h;
1535 int packet_count[2];
1536 uint8_t packet[TS_PACKET_SIZE];
1538 /* only read packets */
1540 st = av_new_stream(s, 0);
1543 av_set_pts_info(st, 60, 1, 27000000);
1544 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1545 st->codec->codec_id = CODEC_ID_MPEG2TS;
1547 /* we iterate until we find two PCRs to estimate the bitrate */
1552 ret = read_packet(s, packet, ts->raw_packet_size);
1555 pid = AV_RB16(packet + 1) & 0x1fff;
1556 if ((pcr_pid == -1 || pcr_pid == pid) &&
1557 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1559 packet_count[nb_pcrs] = nb_packets;
1560 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1568 /* NOTE1: the bitrate is computed without the FEC */
1569 /* NOTE2: it is only the bitrate of the start of the stream */
1570 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1571 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1572 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1573 st->codec->bit_rate = s->bit_rate;
1574 st->start_time = ts->cur_pcr;
1575 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1576 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1579 avio_seek(pb, pos, SEEK_SET);
1585 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1587 static int mpegts_raw_read_packet(AVFormatContext *s,
1590 MpegTSContext *ts = s->priv_data;
1592 int64_t pcr_h, next_pcr_h, pos;
1593 int pcr_l, next_pcr_l;
1594 uint8_t pcr_buf[12];
1596 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1597 return AVERROR(ENOMEM);
1598 pkt->pos= avio_tell(s->pb);
1599 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1601 av_free_packet(pkt);
1604 if (ts->mpeg2ts_compute_pcr) {
1605 /* compute exact PCR for each packet */
1606 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1607 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1608 pos = avio_tell(s->pb);
1609 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1610 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1611 avio_read(s->pb, pcr_buf, 12);
1612 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1613 /* XXX: not precise enough */
1614 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1619 avio_seek(s->pb, pos, SEEK_SET);
1620 /* no next PCR found: we use previous increment */
1621 ts->cur_pcr = pcr_h * 300 + pcr_l;
1623 pkt->pts = ts->cur_pcr;
1624 pkt->duration = ts->pcr_incr;
1625 ts->cur_pcr += ts->pcr_incr;
1627 pkt->stream_index = 0;
1631 static int mpegts_read_packet(AVFormatContext *s,
1634 MpegTSContext *ts = s->priv_data;
1637 if (avio_tell(s->pb) != ts->last_pos) {
1638 /* seek detected, flush pes buffer */
1639 for (i = 0; i < NB_PID_MAX; i++) {
1640 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1641 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1642 av_freep(&pes->buffer);
1643 pes->data_index = 0;
1644 pes->state = MPEGTS_SKIP; /* skip until pes header */
1650 ret = handle_packets(ts, 0);
1652 /* flush pes data left */
1653 for (i = 0; i < NB_PID_MAX; i++) {
1654 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1655 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1656 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1657 new_pes_packet(pes, pkt);
1658 pes->state = MPEGTS_SKIP;
1666 ts->last_pos = avio_tell(s->pb);
1671 static int mpegts_read_close(AVFormatContext *s)
1673 MpegTSContext *ts = s->priv_data;
1678 for(i=0;i<NB_PID_MAX;i++)
1679 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1684 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1685 int64_t *ppos, int64_t pos_limit)
1687 MpegTSContext *ts = s->priv_data;
1688 int64_t pos, timestamp;
1689 uint8_t buf[TS_PACKET_SIZE];
1690 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1691 const int find_next= 1;
1692 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1695 avio_seek(s->pb, pos, SEEK_SET);
1696 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1697 return AV_NOPTS_VALUE;
1698 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1699 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1702 pos += ts->raw_packet_size;
1706 pos -= ts->raw_packet_size;
1708 return AV_NOPTS_VALUE;
1709 avio_seek(s->pb, pos, SEEK_SET);
1710 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1711 return AV_NOPTS_VALUE;
1712 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1713 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1723 #ifdef USE_SYNCPOINT_SEARCH
1725 static int read_seek2(AVFormatContext *s,
1734 int64_t ts_ret, ts_adj;
1735 int stream_index_gen_search;
1737 AVParserState *backup;
1739 backup = ff_store_parser_state(s);
1741 // detect direction of seeking for search purposes
1742 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1743 AVSEEK_FLAG_BACKWARD : 0;
1745 if (flags & AVSEEK_FLAG_BYTE) {
1746 // use position directly, we will search starting from it
1749 // search for some position with good timestamp match
1750 if (stream_index < 0) {
1751 stream_index_gen_search = av_find_default_stream_index(s);
1752 if (stream_index_gen_search < 0) {
1753 ff_restore_parser_state(s, backup);
1757 st = s->streams[stream_index_gen_search];
1758 // timestamp for default must be expressed in AV_TIME_BASE units
1759 ts_adj = av_rescale(target_ts,
1761 AV_TIME_BASE * (int64_t)st->time_base.num);
1764 stream_index_gen_search = stream_index;
1766 pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1770 flags, &ts_ret, mpegts_get_pcr);
1772 ff_restore_parser_state(s, backup);
1777 // search for actual matching keyframe/starting position for all streams
1778 if (ff_gen_syncpoint_search(s, stream_index, pos,
1779 min_ts, target_ts, max_ts,
1781 ff_restore_parser_state(s, backup);
1785 ff_free_parser_state(s, backup);
1789 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1792 if (flags & AVSEEK_FLAG_BACKWARD) {
1793 flags &= ~AVSEEK_FLAG_BACKWARD;
1794 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1796 // for compatibility reasons, seek to the best-fitting timestamp
1797 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1799 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1801 // for compatibility reasons, seek to the best-fitting timestamp
1802 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1809 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1810 MpegTSContext *ts = s->priv_data;
1811 uint8_t buf[TS_PACKET_SIZE];
1814 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1817 pos= avio_tell(s->pb);
1820 avio_seek(s->pb, pos, SEEK_SET);
1821 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1823 // pid = AV_RB16(buf + 1) & 0x1fff;
1824 if(buf[1] & 0x40) break;
1825 pos += ts->raw_packet_size;
1827 avio_seek(s->pb, pos, SEEK_SET);
1834 /**************************************************************/
1835 /* parsing functions - called from other demuxers such as RTP */
1837 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1841 ts = av_mallocz(sizeof(MpegTSContext));
1844 /* no stream case, currently used by RTP */
1845 ts->raw_packet_size = TS_PACKET_SIZE;
1851 /* return the consumed length if a packet was output, or -1 if no
1853 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1854 const uint8_t *buf, int len)
1862 if (ts->stop_parse>0)
1864 if (len < TS_PACKET_SIZE)
1866 if (buf[0] != 0x47) {
1870 handle_packet(ts, buf);
1871 buf += TS_PACKET_SIZE;
1872 len -= TS_PACKET_SIZE;
1878 void ff_mpegts_parse_close(MpegTSContext *ts)
1882 for(i=0;i<NB_PID_MAX;i++)
1883 av_free(ts->pids[i]);
1887 AVInputFormat ff_mpegts_demuxer = {
1889 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1890 sizeof(MpegTSContext),
1897 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1898 #ifdef USE_SYNCPOINT_SEARCH
1899 .read_seek2 = read_seek2,
1903 AVInputFormat ff_mpegtsraw_demuxer = {
1905 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1906 sizeof(MpegTSContext),
1909 mpegts_raw_read_packet,
1913 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1914 #ifdef USE_SYNCPOINT_SEARCH
1915 .read_seek2 = read_seek2,
1917 .priv_class = &mpegtsraw_class,