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/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 #define MAX_MP4_DESCR_COUNT 16
47 enum MpegTSFilterType {
52 typedef struct MpegTSFilter MpegTSFilter;
54 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
56 typedef struct MpegTSPESFilter {
61 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
63 typedef void SetServiceCallback(void *opaque, int ret);
65 typedef struct MpegTSSectionFilter {
69 unsigned int check_crc:1;
70 unsigned int end_of_section_reached:1;
71 SectionCallback *section_cb;
73 } MpegTSSectionFilter;
77 int last_cc; /* last cc code (-1 if first packet) */
78 enum MpegTSFilterType type;
80 MpegTSPESFilter pes_filter;
81 MpegTSSectionFilter section_filter;
85 #define MAX_PIDS_PER_PROGRAM 64
87 unsigned int id; //program id/service id
89 unsigned int pids[MAX_PIDS_PER_PROGRAM];
92 struct MpegTSContext {
95 AVFormatContext *stream;
96 /** raw packet size, including FEC if present */
101 /** if true, all pids are analyzed to find streams */
104 /** compute exact PCR for each transport stream packet */
105 int mpeg2ts_compute_pcr;
107 int64_t cur_pcr; /**< used to estimate the exact PCR */
108 int pcr_incr; /**< used to estimate the exact PCR */
110 /* data needed to handle file based ts */
111 /** stop parsing loop */
113 /** packet containing Audio/Video data */
115 /** to detect seek */
118 /******************************************/
119 /* private mpegts data */
121 /** structure to keep track of Program->pids mapping */
126 /** filters for various streams specified by PMT + for the PAT and PMT */
127 MpegTSFilter *pids[NB_PID_MAX];
130 static const AVOption options[] = {
131 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
132 {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
136 static const AVClass mpegtsraw_class = {
137 .class_name = "mpegtsraw demuxer",
138 .item_name = av_default_item_name,
140 .version = LIBAVUTIL_VERSION_INT,
143 /* TS stream handling */
148 MPEGTS_PESHEADER_FILL,
153 /* enough for PES header + length */
154 #define PES_START_SIZE 6
155 #define PES_HEADER_SIZE 9
156 #define MAX_PES_HEADER_SIZE (9 + 255)
158 typedef struct PESContext {
160 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
163 AVFormatContext *stream;
165 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
166 enum MpegTSState state;
167 /* used to get the format */
169 int flags; /**< copied to the AVPacket flags */
172 int extended_stream_id;
174 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
175 uint8_t header[MAX_PES_HEADER_SIZE];
179 extern AVInputFormat ff_mpegts_demuxer;
181 static void clear_program(MpegTSContext *ts, unsigned int programid)
185 for(i=0; i<ts->nb_prg; i++)
186 if(ts->prg[i].id == programid)
187 ts->prg[i].nb_pids = 0;
190 static void clear_programs(MpegTSContext *ts)
196 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
199 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
203 p = &ts->prg[ts->nb_prg];
209 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
212 struct Program *p = NULL;
213 for(i=0; i<ts->nb_prg; i++) {
214 if(ts->prg[i].id == programid) {
222 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
224 p->pids[p->nb_pids++] = pid;
228 * @brief discard_pid() decides if the pid is to be discarded according
229 * to caller's programs selection
230 * @param ts : - TS context
232 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
235 static int discard_pid(MpegTSContext *ts, unsigned int pid)
238 int used = 0, discarded = 0;
240 for(i=0; i<ts->nb_prg; i++) {
242 for(j=0; j<p->nb_pids; j++) {
243 if(p->pids[j] != pid)
245 //is program with id p->id set to be discarded?
246 for(k=0; k<ts->stream->nb_programs; k++) {
247 if(ts->stream->programs[k]->id == p->id) {
248 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
257 return !used && discarded;
261 * Assemble PES packets out of TS packets, and then call the "section_cb"
262 * function when they are complete.
264 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
265 const uint8_t *buf, int buf_size, int is_start)
267 MpegTSSectionFilter *tss = &tss1->u.section_filter;
271 memcpy(tss->section_buf, buf, buf_size);
272 tss->section_index = buf_size;
273 tss->section_h_size = -1;
274 tss->end_of_section_reached = 0;
276 if (tss->end_of_section_reached)
278 len = 4096 - tss->section_index;
281 memcpy(tss->section_buf + tss->section_index, buf, len);
282 tss->section_index += len;
285 /* compute section length if possible */
286 if (tss->section_h_size == -1 && tss->section_index >= 3) {
287 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
290 tss->section_h_size = len;
293 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
294 tss->end_of_section_reached = 1;
295 if (!tss->check_crc ||
296 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
297 tss->section_buf, tss->section_h_size) == 0)
298 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
302 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
303 SectionCallback *section_cb, void *opaque,
307 MpegTSFilter *filter;
308 MpegTSSectionFilter *sec;
310 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
312 if (pid >= NB_PID_MAX || ts->pids[pid])
314 filter = av_mallocz(sizeof(MpegTSFilter));
317 ts->pids[pid] = filter;
318 filter->type = MPEGTS_SECTION;
320 filter->last_cc = -1;
321 sec = &filter->u.section_filter;
322 sec->section_cb = section_cb;
323 sec->opaque = opaque;
324 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
325 sec->check_crc = check_crc;
326 if (!sec->section_buf) {
333 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
337 MpegTSFilter *filter;
338 MpegTSPESFilter *pes;
340 if (pid >= NB_PID_MAX || ts->pids[pid])
342 filter = av_mallocz(sizeof(MpegTSFilter));
345 ts->pids[pid] = filter;
346 filter->type = MPEGTS_PES;
348 filter->last_cc = -1;
349 pes = &filter->u.pes_filter;
350 pes->pes_cb = pes_cb;
351 pes->opaque = opaque;
355 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
360 if (filter->type == MPEGTS_SECTION)
361 av_freep(&filter->u.section_filter.section_buf);
362 else if (filter->type == MPEGTS_PES) {
363 PESContext *pes = filter->u.pes_filter.opaque;
364 av_freep(&pes->buffer);
365 /* referenced private data will be freed later in
366 * av_close_input_stream */
367 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
368 av_freep(&filter->u.pes_filter.opaque);
373 ts->pids[pid] = NULL;
376 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
377 int stat[TS_MAX_PACKET_SIZE];
382 memset(stat, 0, packet_size*sizeof(int));
384 for(x=i=0; i<size-3; i++){
385 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
387 if(stat[x] > best_score){
394 if(x == packet_size) x= 0;
400 /* autodetect fec presence. Must have at least 1024 bytes */
401 static int get_packet_size(const uint8_t *buf, int size)
403 int score, fec_score, dvhs_score;
405 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
408 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
409 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
410 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
411 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
413 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
414 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
415 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
419 typedef struct SectionHeader {
424 uint8_t last_sec_num;
427 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
440 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
446 if ((p + 1) >= p_end)
454 /* read and allocate a DVB string preceeded by its length */
455 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
462 len = get8(&p, p_end);
465 if ((p + len) > p_end)
467 str = av_malloc(len + 1);
477 static int parse_section_header(SectionHeader *h,
478 const uint8_t **pp, const uint8_t *p_end)
482 val = get8(pp, p_end);
487 val = get16(pp, p_end);
491 val = get8(pp, p_end);
494 h->version = (val >> 1) & 0x1f;
495 val = get8(pp, p_end);
499 val = get8(pp, p_end);
502 h->last_sec_num = val;
507 uint32_t stream_type;
508 enum AVMediaType codec_type;
509 enum CodecID codec_id;
512 static const StreamType ISO_types[] = {
513 { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
514 { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
515 { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
516 { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
517 { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
518 { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
519 { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
520 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
521 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
522 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
526 static const StreamType HDMV_types[] = {
527 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
528 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
529 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
530 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
531 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
532 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
537 static const StreamType MISC_types[] = {
538 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
539 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
543 static const StreamType REGD_types[] = {
544 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
545 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
546 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
550 /* descriptor present */
551 static const StreamType DESC_types[] = {
552 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
553 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
554 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
555 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
556 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
560 static void mpegts_find_stream_type(AVStream *st,
561 uint32_t stream_type, const StreamType *types)
563 for (; types->stream_type; types++) {
564 if (stream_type == types->stream_type) {
565 st->codec->codec_type = types->codec_type;
566 st->codec->codec_id = types->codec_id;
572 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
573 uint32_t stream_type, uint32_t prog_reg_desc)
575 av_set_pts_info(st, 33, 1, 90000);
577 st->codec->codec_type = AVMEDIA_TYPE_DATA;
578 st->codec->codec_id = CODEC_ID_NONE;
579 st->need_parsing = AVSTREAM_PARSE_FULL;
581 pes->stream_type = stream_type;
583 av_log(pes->stream, AV_LOG_DEBUG,
584 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
585 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
587 st->codec->codec_tag = pes->stream_type;
589 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
590 if (prog_reg_desc == AV_RL32("HDMV") &&
591 st->codec->codec_id == CODEC_ID_NONE) {
592 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
593 if (pes->stream_type == 0x83) {
594 // HDMV TrueHD streams also contain an AC3 coded version of the
595 // audio track - add a second stream for this
597 // priv_data cannot be shared between streams
598 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
600 return AVERROR(ENOMEM);
601 memcpy(sub_pes, pes, sizeof(*sub_pes));
603 sub_st = avformat_new_stream(pes->stream, NULL);
606 return AVERROR(ENOMEM);
609 sub_st->id = pes->pid;
610 av_set_pts_info(sub_st, 33, 1, 90000);
611 sub_st->priv_data = sub_pes;
612 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
613 sub_st->codec->codec_id = CODEC_ID_AC3;
614 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
615 sub_pes->sub_st = pes->sub_st = sub_st;
618 if (st->codec->codec_id == CODEC_ID_NONE)
619 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
624 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
628 pkt->destruct = av_destruct_packet;
629 pkt->data = pes->buffer;
630 pkt->size = pes->data_index;
632 if(pes->total_size != MAX_PES_PAYLOAD &&
633 pes->pes_header_size + pes->data_index != pes->total_size + 6) {
634 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
635 pes->flags |= AV_PKT_FLAG_CORRUPT;
637 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
639 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
640 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
641 pkt->stream_index = pes->sub_st->index;
643 pkt->stream_index = pes->st->index;
646 /* store position of first TS packet of this PES packet */
647 pkt->pos = pes->ts_packet_pos;
648 pkt->flags = pes->flags;
650 /* reset pts values */
651 pes->pts = AV_NOPTS_VALUE;
652 pes->dts = AV_NOPTS_VALUE;
658 /* return non zero if a packet could be constructed */
659 static int mpegts_push_data(MpegTSFilter *filter,
660 const uint8_t *buf, int buf_size, int is_start,
663 PESContext *pes = filter->u.pes_filter.opaque;
664 MpegTSContext *ts = pes->ts;
672 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
673 new_pes_packet(pes, ts->pkt);
676 pes->state = MPEGTS_HEADER;
678 pes->ts_packet_pos = pos;
681 while (buf_size > 0) {
684 len = PES_START_SIZE - pes->data_index;
687 memcpy(pes->header + pes->data_index, p, len);
688 pes->data_index += len;
691 if (pes->data_index == PES_START_SIZE) {
692 /* we got all the PES or section header. We can now
694 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
695 pes->header[2] == 0x01) {
696 /* it must be an mpeg2 PES stream */
697 code = pes->header[3] | 0x100;
698 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
700 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
701 code == 0x1be) /* padding_stream */
704 /* stream not present in PMT */
706 pes->st = avformat_new_stream(ts->stream, NULL);
708 return AVERROR(ENOMEM);
709 pes->st->id = pes->pid;
710 mpegts_set_stream_info(pes->st, pes, 0, 0);
713 pes->total_size = AV_RB16(pes->header + 4);
714 /* NOTE: a zero total size means the PES size is
716 if (!pes->total_size)
717 pes->total_size = MAX_PES_PAYLOAD;
719 /* allocate pes buffer */
720 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
722 return AVERROR(ENOMEM);
724 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
725 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
726 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
727 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
728 pes->state = MPEGTS_PESHEADER;
729 if (pes->st->codec->codec_id == CODEC_ID_NONE) {
730 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
731 pes->pid, pes->stream_type);
732 pes->st->codec->codec_id = CODEC_ID_PROBE;
735 pes->state = MPEGTS_PAYLOAD;
739 /* otherwise, it should be a table */
742 pes->state = MPEGTS_SKIP;
747 /**********************************************/
748 /* PES packing parsing */
749 case MPEGTS_PESHEADER:
750 len = PES_HEADER_SIZE - pes->data_index;
755 memcpy(pes->header + pes->data_index, p, len);
756 pes->data_index += len;
759 if (pes->data_index == PES_HEADER_SIZE) {
760 pes->pes_header_size = pes->header[8] + 9;
761 pes->state = MPEGTS_PESHEADER_FILL;
764 case MPEGTS_PESHEADER_FILL:
765 len = pes->pes_header_size - pes->data_index;
770 memcpy(pes->header + pes->data_index, p, len);
771 pes->data_index += len;
774 if (pes->data_index == pes->pes_header_size) {
776 unsigned int flags, pes_ext, skip;
778 flags = pes->header[7];
780 pes->pts = AV_NOPTS_VALUE;
781 pes->dts = AV_NOPTS_VALUE;
782 if ((flags & 0xc0) == 0x80) {
783 pes->dts = pes->pts = ff_parse_pes_pts(r);
785 } else if ((flags & 0xc0) == 0xc0) {
786 pes->pts = ff_parse_pes_pts(r);
788 pes->dts = ff_parse_pes_pts(r);
791 pes->extended_stream_id = -1;
792 if (flags & 0x01) { /* PES extension */
794 /* Skip PES private data, program packet sequence counter and P-STD buffer */
795 skip = (pes_ext >> 4) & 0xb;
798 if ((pes_ext & 0x41) == 0x01 &&
799 (r + 2) <= (pes->header + pes->pes_header_size)) {
800 /* PES extension 2 */
801 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
802 pes->extended_stream_id = r[1];
806 /* we got the full header. We parse it and get the payload */
807 pes->state = MPEGTS_PAYLOAD;
812 if (buf_size > 0 && pes->buffer) {
813 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
814 new_pes_packet(pes, ts->pkt);
815 pes->total_size = MAX_PES_PAYLOAD;
816 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
818 return AVERROR(ENOMEM);
820 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
821 // pes packet size is < ts size packet and pes data is padded with 0xff
822 // not sure if this is legal in ts but see issue #2392
823 buf_size = pes->total_size;
825 memcpy(pes->buffer+pes->data_index, p, buf_size);
826 pes->data_index += buf_size;
829 /* emit complete packets with known packet size
830 * decreases demuxer delay for infrequent packets like subtitles from
831 * a couple of seconds to milliseconds for properly muxed files.
832 * total_size is the number of bytes following pes_packet_length
833 * in the pes header, i.e. not counting the first 6 bytes */
834 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
835 pes->pes_header_size + pes->data_index == pes->total_size + 6) {
837 new_pes_packet(pes, ts->pkt);
849 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
854 /* if no pid found, then add a pid context */
855 pes = av_mallocz(sizeof(PESContext));
859 pes->stream = ts->stream;
861 pes->pcr_pid = pcr_pid;
862 pes->state = MPEGTS_SKIP;
863 pes->pts = AV_NOPTS_VALUE;
864 pes->dts = AV_NOPTS_VALUE;
865 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
878 Mp4Descr *active_descr;
882 } MP4DescrParseContext;
884 static int init_MP4DescrParseContext(
885 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
886 unsigned size, Mp4Descr *descr, int max_descr_count)
890 return AVERROR_INVALIDDATA;
892 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
893 NULL, NULL, NULL, NULL)) < 0)
900 d->active_descr = NULL;
901 d->max_descr_count = max_descr_count;
906 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
907 int64_t new_off = avio_tell(pb);
908 (*len) -= new_off - *off;
912 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
915 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
918 if (parse_mp4_descr(d, off, len, 0) < 0)
920 update_offsets(&d->pb, &off, &len);
925 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
927 avio_rb16(&d->pb); // ID
933 update_offsets(&d->pb, &off, &len);
934 return parse_mp4_descr_arr(d, off, len);
937 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
940 if (d->descr_count >= d->max_descr_count)
942 ff_mp4_parse_es_descr(&d->pb, &es_id);
943 d->active_descr = d->descr + (d->descr_count++);
945 d->active_descr->es_id = es_id;
946 update_offsets(&d->pb, &off, &len);
947 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
949 d->active_descr = NULL;
953 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
955 Mp4Descr *descr = d->active_descr;
958 d->active_descr->dec_config_descr = av_malloc(len);
959 if (!descr->dec_config_descr)
960 return AVERROR(ENOMEM);
961 descr->dec_config_descr_len = len;
962 avio_read(&d->pb, descr->dec_config_descr, len);
966 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
969 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
970 update_offsets(&d->pb, &off, &len);
971 if (len < 0 || len1 > len || len1 <= 0) {
972 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
976 if (d->level++ >= MAX_LEVEL) {
977 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
981 if (target_tag && tag != target_tag) {
982 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
988 parse_MP4IODescrTag(d, off, len1);
991 parse_MP4ESDescrTag(d, off, len1);
993 case MP4DecConfigDescrTag:
994 parse_MP4DecConfigDescrTag(d, off, len1);
1000 avio_seek(&d->pb, off + len1, SEEK_SET);
1004 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1005 Mp4Descr *descr, int *descr_count, int max_descr_count)
1007 MP4DescrParseContext d;
1008 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1011 parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1013 *descr_count = d.descr_count;
1017 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1018 const uint8_t **pp, const uint8_t *desc_list_end,
1019 Mp4Descr *mp4_descr, int mp4_descr_count, int pid)
1021 const uint8_t *desc_end;
1022 int desc_len, desc_tag, desc_es_id;
1026 desc_tag = get8(pp, desc_list_end);
1029 desc_len = get8(pp, desc_list_end);
1032 desc_end = *pp + desc_len;
1033 if (desc_end > desc_list_end)
1036 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1038 if (st->codec->codec_id == CODEC_ID_NONE &&
1039 stream_type == STREAM_TYPE_PRIVATE_DATA)
1040 mpegts_find_stream_type(st, desc_tag, DESC_types);
1043 case 0x1E: /* SL descriptor */
1044 desc_es_id = get16(pp, desc_end);
1045 for (i = 0; i < mp4_descr_count; i++)
1046 if (mp4_descr[i].dec_config_descr_len &&
1047 mp4_descr[i].es_id == desc_es_id) {
1049 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1050 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1051 ff_mp4_read_dec_config_descr(fc, st, &pb);
1052 if (st->codec->codec_id == CODEC_ID_AAC &&
1053 st->codec->extradata_size > 0)
1054 st->need_parsing = 0;
1057 case 0x1F: /* FMC descriptor */
1058 get16(pp, desc_end);
1059 if (mp4_descr_count > 0 && st->codec->codec_id == CODEC_ID_AAC_LATM &&
1060 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1062 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1063 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1064 ff_mp4_read_dec_config_descr(fc, st, &pb);
1065 if (st->codec->codec_id == CODEC_ID_AAC &&
1066 st->codec->extradata_size > 0)
1067 st->need_parsing = 0;
1070 case 0x56: /* DVB teletext descriptor */
1071 language[0] = get8(pp, desc_end);
1072 language[1] = get8(pp, desc_end);
1073 language[2] = get8(pp, desc_end);
1075 av_dict_set(&st->metadata, "language", language, 0);
1077 case 0x59: /* subtitling descriptor */
1078 language[0] = get8(pp, desc_end);
1079 language[1] = get8(pp, desc_end);
1080 language[2] = get8(pp, desc_end);
1082 /* hearing impaired subtitles detection */
1083 switch(get8(pp, desc_end)) {
1084 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1085 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1086 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1087 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1088 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1089 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1090 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1093 if (st->codec->extradata) {
1094 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1095 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1097 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1098 if (st->codec->extradata) {
1099 st->codec->extradata_size = 4;
1100 memcpy(st->codec->extradata, *pp, 4);
1104 av_dict_set(&st->metadata, "language", language, 0);
1106 case 0x0a: /* ISO 639 language descriptor */
1107 for (i = 0; i + 4 <= desc_len; i += 4) {
1108 language[i + 0] = get8(pp, desc_end);
1109 language[i + 1] = get8(pp, desc_end);
1110 language[i + 2] = get8(pp, desc_end);
1111 language[i + 3] = ',';
1112 switch (get8(pp, desc_end)) {
1113 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1114 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1115 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1119 language[i - 1] = 0;
1120 av_dict_set(&st->metadata, "language", language, 0);
1123 case 0x05: /* registration descriptor */
1124 st->codec->codec_tag = bytestream_get_le32(pp);
1125 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1126 if (st->codec->codec_id == CODEC_ID_NONE &&
1127 stream_type == STREAM_TYPE_PRIVATE_DATA)
1128 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1137 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1139 MpegTSContext *ts = filter->u.section_filter.opaque;
1140 SectionHeader h1, *h = &h1;
1143 const uint8_t *p, *p_end, *desc_list_end;
1144 int program_info_length, pcr_pid, pid, stream_type;
1146 uint32_t prog_reg_desc = 0; /* registration descriptor */
1148 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1149 int mp4_descr_count = 0;
1152 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1153 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1155 p_end = section + section_len - 4;
1157 if (parse_section_header(h, &p, p_end) < 0)
1160 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1161 h->id, h->sec_num, h->last_sec_num);
1163 if (h->tid != PMT_TID)
1166 clear_program(ts, h->id);
1167 pcr_pid = get16(&p, p_end) & 0x1fff;
1170 add_pid_to_pmt(ts, h->id, pcr_pid);
1172 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1174 program_info_length = get16(&p, p_end) & 0xfff;
1175 if (program_info_length < 0)
1177 while(program_info_length >= 2) {
1179 tag = get8(&p, p_end);
1180 len = get8(&p, p_end);
1182 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1184 if(len > program_info_length - 2)
1185 //something else is broken, exit the program_descriptors_loop
1187 program_info_length -= len + 2;
1188 if (tag == 0x1d) { // IOD descriptor
1189 get8(&p, p_end); // scope
1190 get8(&p, p_end); // label
1192 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1193 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1194 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1195 prog_reg_desc = bytestream_get_le32(&p);
1200 p += program_info_length;
1204 // stop parsing after pmt, we found header
1205 if (!ts->stream->nb_streams)
1210 stream_type = get8(&p, p_end);
1211 if (stream_type < 0)
1213 pid = get16(&p, p_end) & 0x1fff;
1217 /* now create ffmpeg stream */
1218 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1219 pes = ts->pids[pid]->u.pes_filter.opaque;
1221 pes->st = avformat_new_stream(pes->stream, NULL);
1226 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1227 pes = add_pes_stream(ts, pid, pcr_pid);
1229 st = avformat_new_stream(pes->stream, NULL);
1237 if (!pes->stream_type)
1238 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1240 add_pid_to_pmt(ts, h->id, pid);
1242 ff_program_add_stream_index(ts->stream, h->id, st->index);
1244 desc_list_len = get16(&p, p_end) & 0xfff;
1245 if (desc_list_len < 0)
1247 desc_list_end = p + desc_list_len;
1248 if (desc_list_end > p_end)
1251 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1252 mp4_descr, mp4_descr_count, pid) < 0)
1255 if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1256 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1257 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1264 for (i = 0; i < mp4_descr_count; i++)
1265 av_free(mp4_descr[i].dec_config_descr);
1268 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1270 MpegTSContext *ts = filter->u.section_filter.opaque;
1271 SectionHeader h1, *h = &h1;
1272 const uint8_t *p, *p_end;
1275 av_dlog(ts->stream, "PAT:\n");
1276 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1278 p_end = section + section_len - 4;
1280 if (parse_section_header(h, &p, p_end) < 0)
1282 if (h->tid != PAT_TID)
1287 sid = get16(&p, p_end);
1290 pmt_pid = get16(&p, p_end) & 0x1fff;
1294 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1296 if (sid == 0x0000) {
1299 av_new_program(ts->stream, sid);
1300 if (ts->pids[pmt_pid])
1301 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1302 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1303 add_pat_entry(ts, sid);
1304 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1305 add_pid_to_pmt(ts, sid, pmt_pid);
1310 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1312 MpegTSContext *ts = filter->u.section_filter.opaque;
1313 SectionHeader h1, *h = &h1;
1314 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1315 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1316 char *name, *provider_name;
1318 av_dlog(ts->stream, "SDT:\n");
1319 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1321 p_end = section + section_len - 4;
1323 if (parse_section_header(h, &p, p_end) < 0)
1325 if (h->tid != SDT_TID)
1327 onid = get16(&p, p_end);
1330 val = get8(&p, p_end);
1334 sid = get16(&p, p_end);
1337 val = get8(&p, p_end);
1340 desc_list_len = get16(&p, p_end) & 0xfff;
1341 if (desc_list_len < 0)
1343 desc_list_end = p + desc_list_len;
1344 if (desc_list_end > p_end)
1347 desc_tag = get8(&p, desc_list_end);
1350 desc_len = get8(&p, desc_list_end);
1351 desc_end = p + desc_len;
1352 if (desc_end > desc_list_end)
1355 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1356 desc_tag, desc_len);
1360 service_type = get8(&p, p_end);
1361 if (service_type < 0)
1363 provider_name = getstr8(&p, p_end);
1366 name = getstr8(&p, p_end);
1368 AVProgram *program = av_new_program(ts->stream, sid);
1370 av_dict_set(&program->metadata, "service_name", name, 0);
1371 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1375 av_free(provider_name);
1386 /* handle one TS packet */
1387 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1389 AVFormatContext *s = ts->stream;
1391 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1392 has_adaptation, has_payload;
1393 const uint8_t *p, *p_end;
1396 pid = AV_RB16(packet + 1) & 0x1fff;
1397 if(pid && discard_pid(ts, pid))
1399 is_start = packet[1] & 0x40;
1400 tss = ts->pids[pid];
1401 if (ts->auto_guess && tss == NULL && is_start) {
1402 add_pes_stream(ts, pid, -1);
1403 tss = ts->pids[pid];
1408 afc = (packet[3] >> 4) & 3;
1409 if (afc == 0) /* reserved value */
1411 has_adaptation = afc & 2;
1412 has_payload = afc & 1;
1413 is_discontinuity = has_adaptation
1414 && packet[4] != 0 /* with length > 0 */
1415 && (packet[5] & 0x80); /* and discontinuity indicated */
1417 /* continuity check (currently not used) */
1418 cc = (packet[3] & 0xf);
1419 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1420 cc_ok = pid == 0x1FFF // null packet PID
1423 || expected_cc == cc;
1427 av_log(ts->stream, AV_LOG_WARNING,
1428 "Continuity check failed for pid %d expected %d got %d\n",
1429 pid, expected_cc, cc);
1430 if(tss->type == MPEGTS_PES) {
1431 PESContext *pc = tss->u.pes_filter.opaque;
1432 pc->flags |= AV_PKT_FLAG_CORRUPT;
1439 if (has_adaptation) {
1440 /* skip adapation field */
1443 /* if past the end of packet, ignore */
1444 p_end = packet + TS_PACKET_SIZE;
1448 pos = avio_tell(ts->stream->pb);
1449 ts->pos47= pos % ts->raw_packet_size;
1451 if (tss->type == MPEGTS_SECTION) {
1453 /* pointer field present */
1455 if (p + len > p_end)
1458 /* write remaining section bytes */
1459 write_section_data(s, tss,
1461 /* check whether filter has been closed */
1467 write_section_data(s, tss,
1472 write_section_data(s, tss,
1478 // Note: The position here points actually behind the current packet.
1479 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1480 pos - ts->raw_packet_size)) < 0)
1487 /* XXX: try to find a better synchro over several packets (use
1488 get_packet_size() ?) */
1489 static int mpegts_resync(AVFormatContext *s)
1491 AVIOContext *pb = s->pb;
1494 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1496 if (pb->eof_reached)
1499 avio_seek(pb, -1, SEEK_CUR);
1503 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1508 /* return -1 if error or EOF. Return 0 if OK. */
1509 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1511 AVIOContext *pb = s->pb;
1515 len = avio_read(pb, buf, TS_PACKET_SIZE);
1516 if (len != TS_PACKET_SIZE)
1517 return len < 0 ? len : AVERROR_EOF;
1518 /* check paquet sync byte */
1519 if (buf[0] != 0x47) {
1520 /* find a new packet start */
1521 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1522 if (mpegts_resync(s) < 0)
1523 return AVERROR(EAGAIN);
1527 skip = raw_packet_size - TS_PACKET_SIZE;
1529 avio_skip(pb, skip);
1536 static int handle_packets(MpegTSContext *ts, int nb_packets)
1538 AVFormatContext *s = ts->stream;
1539 uint8_t packet[TS_PACKET_SIZE];
1540 int packet_num, ret = 0;
1542 if (avio_tell(s->pb) != ts->last_pos) {
1544 av_dlog(ts->stream, "Skipping after seek\n");
1545 /* seek detected, flush pes buffer */
1546 for (i = 0; i < NB_PID_MAX; i++) {
1548 if (ts->pids[i]->type == MPEGTS_PES) {
1549 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1550 av_freep(&pes->buffer);
1551 pes->data_index = 0;
1552 pes->state = MPEGTS_SKIP; /* skip until pes header */
1554 ts->pids[i]->last_cc = -1;
1562 if (ts->stop_parse>0)
1565 if (nb_packets != 0 && packet_num >= nb_packets)
1567 ret = read_packet(s, packet, ts->raw_packet_size);
1570 ret = handle_packet(ts, packet);
1574 ts->last_pos = avio_tell(s->pb);
1578 static int mpegts_probe(AVProbeData *p)
1581 const int size= p->buf_size;
1582 int score, fec_score, dvhs_score;
1583 int check_count= size / TS_FEC_PACKET_SIZE;
1584 #define CHECK_COUNT 10
1586 if (check_count < CHECK_COUNT)
1589 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1590 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1591 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1592 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1594 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1595 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1596 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1597 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1600 /* only use the extension for safer guess */
1601 if (av_match_ext(p->filename, "ts"))
1602 return AVPROBE_SCORE_MAX;
1608 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1609 (-1) if not available */
1610 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1611 const uint8_t *packet)
1613 int afc, len, flags;
1617 afc = (packet[3] >> 4) & 3;
1627 if (!(flags & 0x10))
1632 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1633 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1637 static int mpegts_read_header(AVFormatContext *s,
1638 AVFormatParameters *ap)
1640 MpegTSContext *ts = s->priv_data;
1641 AVIOContext *pb = s->pb;
1642 uint8_t buf[5*1024];
1646 /* read the first 1024 bytes to get packet size */
1647 pos = avio_tell(pb);
1648 len = avio_read(pb, buf, sizeof(buf));
1649 if (len != sizeof(buf))
1651 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1652 if (ts->raw_packet_size <= 0)
1657 if (s->iformat == &ff_mpegts_demuxer) {
1660 /* first do a scaning to get all the services */
1661 if (pb->seekable && avio_seek(pb, pos, SEEK_SET) < 0)
1662 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1664 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1666 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1668 handle_packets(ts, s->probesize / ts->raw_packet_size);
1669 /* if could not find service, enable auto_guess */
1673 av_dlog(ts->stream, "tuning done\n");
1675 s->ctx_flags |= AVFMTCTX_NOHEADER;
1678 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1679 int64_t pcrs[2], pcr_h;
1680 int packet_count[2];
1681 uint8_t packet[TS_PACKET_SIZE];
1683 /* only read packets */
1685 st = avformat_new_stream(s, NULL);
1688 av_set_pts_info(st, 60, 1, 27000000);
1689 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1690 st->codec->codec_id = CODEC_ID_MPEG2TS;
1692 /* we iterate until we find two PCRs to estimate the bitrate */
1697 ret = read_packet(s, packet, ts->raw_packet_size);
1700 pid = AV_RB16(packet + 1) & 0x1fff;
1701 if ((pcr_pid == -1 || pcr_pid == pid) &&
1702 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1704 packet_count[nb_pcrs] = nb_packets;
1705 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1713 /* NOTE1: the bitrate is computed without the FEC */
1714 /* NOTE2: it is only the bitrate of the start of the stream */
1715 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1716 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1717 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1718 st->codec->bit_rate = s->bit_rate;
1719 st->start_time = ts->cur_pcr;
1720 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1721 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1724 avio_seek(pb, pos, SEEK_SET);
1730 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1732 static int mpegts_raw_read_packet(AVFormatContext *s,
1735 MpegTSContext *ts = s->priv_data;
1737 int64_t pcr_h, next_pcr_h, pos;
1738 int pcr_l, next_pcr_l;
1739 uint8_t pcr_buf[12];
1741 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1742 return AVERROR(ENOMEM);
1743 pkt->pos= avio_tell(s->pb);
1744 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1746 av_free_packet(pkt);
1749 if (ts->mpeg2ts_compute_pcr) {
1750 /* compute exact PCR for each packet */
1751 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1752 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1753 pos = avio_tell(s->pb);
1754 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1755 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1756 avio_read(s->pb, pcr_buf, 12);
1757 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1758 /* XXX: not precise enough */
1759 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1764 avio_seek(s->pb, pos, SEEK_SET);
1765 /* no next PCR found: we use previous increment */
1766 ts->cur_pcr = pcr_h * 300 + pcr_l;
1768 pkt->pts = ts->cur_pcr;
1769 pkt->duration = ts->pcr_incr;
1770 ts->cur_pcr += ts->pcr_incr;
1772 pkt->stream_index = 0;
1776 static int mpegts_read_packet(AVFormatContext *s,
1779 MpegTSContext *ts = s->priv_data;
1783 ret = handle_packets(ts, 0);
1785 /* flush pes data left */
1786 for (i = 0; i < NB_PID_MAX; i++) {
1787 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1788 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1789 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1790 new_pes_packet(pes, pkt);
1791 pes->state = MPEGTS_SKIP;
1802 static int mpegts_read_close(AVFormatContext *s)
1804 MpegTSContext *ts = s->priv_data;
1809 for(i=0;i<NB_PID_MAX;i++)
1810 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1815 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1816 int64_t *ppos, int64_t pos_limit)
1818 MpegTSContext *ts = s->priv_data;
1819 int64_t pos, timestamp;
1820 uint8_t buf[TS_PACKET_SIZE];
1821 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1822 const int find_next= 1;
1823 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1826 avio_seek(s->pb, pos, SEEK_SET);
1827 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1828 return AV_NOPTS_VALUE;
1829 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1830 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1833 pos += ts->raw_packet_size;
1837 pos -= ts->raw_packet_size;
1839 return AV_NOPTS_VALUE;
1840 avio_seek(s->pb, pos, SEEK_SET);
1841 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1842 return AV_NOPTS_VALUE;
1843 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1844 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1854 #ifdef USE_SYNCPOINT_SEARCH
1856 static int read_seek2(AVFormatContext *s,
1865 int64_t ts_ret, ts_adj;
1866 int stream_index_gen_search;
1868 AVParserState *backup;
1870 backup = ff_store_parser_state(s);
1872 // detect direction of seeking for search purposes
1873 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1874 AVSEEK_FLAG_BACKWARD : 0;
1876 if (flags & AVSEEK_FLAG_BYTE) {
1877 // use position directly, we will search starting from it
1880 // search for some position with good timestamp match
1881 if (stream_index < 0) {
1882 stream_index_gen_search = av_find_default_stream_index(s);
1883 if (stream_index_gen_search < 0) {
1884 ff_restore_parser_state(s, backup);
1888 st = s->streams[stream_index_gen_search];
1889 // timestamp for default must be expressed in AV_TIME_BASE units
1890 ts_adj = av_rescale(target_ts,
1892 AV_TIME_BASE * (int64_t)st->time_base.num);
1895 stream_index_gen_search = stream_index;
1897 pos = ff_gen_search(s, stream_index_gen_search, ts_adj,
1901 flags, &ts_ret, mpegts_get_pcr);
1903 ff_restore_parser_state(s, backup);
1908 // search for actual matching keyframe/starting position for all streams
1909 if (ff_gen_syncpoint_search(s, stream_index, pos,
1910 min_ts, target_ts, max_ts,
1912 ff_restore_parser_state(s, backup);
1916 ff_free_parser_state(s, backup);
1920 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1923 if (flags & AVSEEK_FLAG_BACKWARD) {
1924 flags &= ~AVSEEK_FLAG_BACKWARD;
1925 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1927 // for compatibility reasons, seek to the best-fitting timestamp
1928 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1930 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1932 // for compatibility reasons, seek to the best-fitting timestamp
1933 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1940 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1941 MpegTSContext *ts = s->priv_data;
1942 uint8_t buf[TS_PACKET_SIZE];
1945 if (ff_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1948 pos= avio_tell(s->pb);
1951 avio_seek(s->pb, pos, SEEK_SET);
1952 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1954 // pid = AV_RB16(buf + 1) & 0x1fff;
1955 if(buf[1] & 0x40) break;
1956 pos += ts->raw_packet_size;
1958 avio_seek(s->pb, pos, SEEK_SET);
1965 /**************************************************************/
1966 /* parsing functions - called from other demuxers such as RTP */
1968 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1972 ts = av_mallocz(sizeof(MpegTSContext));
1975 /* no stream case, currently used by RTP */
1976 ts->raw_packet_size = TS_PACKET_SIZE;
1982 /* return the consumed length if a packet was output, or -1 if no
1984 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1985 const uint8_t *buf, int len)
1993 if (ts->stop_parse>0)
1995 if (len < TS_PACKET_SIZE)
1997 if (buf[0] != 0x47) {
2001 handle_packet(ts, buf);
2002 buf += TS_PACKET_SIZE;
2003 len -= TS_PACKET_SIZE;
2009 void ff_mpegts_parse_close(MpegTSContext *ts)
2013 for(i=0;i<NB_PID_MAX;i++)
2014 av_free(ts->pids[i]);
2018 AVInputFormat ff_mpegts_demuxer = {
2020 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
2021 .priv_data_size = sizeof(MpegTSContext),
2022 .read_probe = mpegts_probe,
2023 .read_header = mpegts_read_header,
2024 .read_packet = mpegts_read_packet,
2025 .read_close = mpegts_read_close,
2026 .read_seek = read_seek,
2027 .read_timestamp = mpegts_get_pcr,
2028 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
2029 #ifdef USE_SYNCPOINT_SEARCH
2030 .read_seek2 = read_seek2,
2034 AVInputFormat ff_mpegtsraw_demuxer = {
2035 .name = "mpegtsraw",
2036 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
2037 .priv_data_size = sizeof(MpegTSContext),
2038 .read_header = mpegts_read_header,
2039 .read_packet = mpegts_raw_read_packet,
2040 .read_close = mpegts_read_close,
2041 .read_seek = read_seek,
2042 .read_timestamp = mpegts_get_pcr,
2043 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
2044 #ifdef USE_SYNCPOINT_SEARCH
2045 .read_seek2 = read_seek2,
2047 .priv_class = &mpegtsraw_class,