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 #include "libavutil/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avassert.h"
30 #include "libavcodec/bytestream.h"
31 #include "libavcodec/get_bits.h"
32 #include "libavcodec/mathops.h"
36 #include "avio_internal.h"
41 /* maximum size in which we look for synchronisation if
42 synchronisation is lost */
43 #define MAX_RESYNC_SIZE 65536
45 #define MAX_PES_PAYLOAD 200*1024
47 #define MAX_MP4_DESCR_COUNT 16
49 enum MpegTSFilterType {
54 typedef struct MpegTSFilter MpegTSFilter;
56 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos, int64_t cur_pcr);
58 typedef struct MpegTSPESFilter {
63 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
65 typedef void SetServiceCallback(void *opaque, int ret);
67 typedef struct MpegTSSectionFilter {
71 unsigned int check_crc:1;
72 unsigned int end_of_section_reached:1;
73 SectionCallback *section_cb;
75 } MpegTSSectionFilter;
80 int last_cc; /* last cc code (-1 if first packet) */
81 enum MpegTSFilterType type;
83 MpegTSPESFilter pes_filter;
84 MpegTSSectionFilter section_filter;
88 #define MAX_PIDS_PER_PROGRAM 64
90 unsigned int id; //program id/service id
92 unsigned int pids[MAX_PIDS_PER_PROGRAM];
94 /** have we found pmt for this program */
98 struct MpegTSContext {
101 AVFormatContext *stream;
102 /** raw packet size, including FEC if present */
107 #define SIZE_STAT_THRESHOLD 10
111 /** if true, all pids are analyzed to find streams */
114 /** compute exact PCR for each transport stream packet */
115 int mpeg2ts_compute_pcr;
117 /** fix dvb teletext pts */
118 int fix_teletext_pts;
120 int64_t cur_pcr; /**< used to estimate the exact PCR */
121 int pcr_incr; /**< used to estimate the exact PCR */
123 /* data needed to handle file based ts */
124 /** stop parsing loop */
126 /** packet containing Audio/Video data */
128 /** to detect seek */
131 /******************************************/
132 /* private mpegts data */
134 /** structure to keep track of Program->pids mapping */
138 int8_t crc_validity[NB_PID_MAX];
140 /** filters for various streams specified by PMT + for the PAT and PMT */
141 MpegTSFilter *pids[NB_PID_MAX];
145 static const AVOption mpegtsraw_options[] = {
146 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
147 {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
148 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
149 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
153 static const AVClass mpegtsraw_class = {
154 .class_name = "mpegtsraw demuxer",
155 .item_name = av_default_item_name,
156 .option = mpegtsraw_options,
157 .version = LIBAVUTIL_VERSION_INT,
160 static const AVOption mpegts_options[] = {
161 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
162 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
163 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
164 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
168 static const AVClass mpegts_class = {
169 .class_name = "mpegts demuxer",
170 .item_name = av_default_item_name,
171 .option = mpegts_options,
172 .version = LIBAVUTIL_VERSION_INT,
175 /* TS stream handling */
180 MPEGTS_PESHEADER_FILL,
185 /* enough for PES header + length */
186 #define PES_START_SIZE 6
187 #define PES_HEADER_SIZE 9
188 #define MAX_PES_HEADER_SIZE (9 + 255)
190 typedef struct PESContext {
192 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
195 AVFormatContext *stream;
197 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
198 enum MpegTSState state;
199 /* used to get the format */
201 int flags; /**< copied to the AVPacket flags */
204 int extended_stream_id;
206 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
207 uint8_t header[MAX_PES_HEADER_SIZE];
213 extern AVInputFormat ff_mpegts_demuxer;
215 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
218 for(i=0; i<ts->nb_prg; i++) {
219 if(ts->prg[i].id == programid) {
226 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
228 AVProgram *prg = NULL;
230 for(i=0; i<ts->stream->nb_programs; i++)
231 if(ts->stream->programs[i]->id == programid){
232 prg = ts->stream->programs[i];
237 prg->nb_stream_indexes = 0;
240 static void clear_program(MpegTSContext *ts, unsigned int programid)
244 clear_avprogram(ts, programid);
245 for(i=0; i<ts->nb_prg; i++)
246 if(ts->prg[i].id == programid) {
247 ts->prg[i].nb_pids = 0;
248 ts->prg[i].pmt_found = 0;
252 static void clear_programs(MpegTSContext *ts)
258 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
261 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
265 p = &ts->prg[ts->nb_prg];
272 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
274 struct Program *p = get_program(ts, programid);
278 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
280 p->pids[p->nb_pids++] = pid;
283 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
285 struct Program *p = get_program(ts, programid);
292 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
295 for(i=0; i<s->nb_programs; i++) {
296 if(s->programs[i]->id == programid) {
297 s->programs[i]->pcr_pid = pid;
304 * @brief discard_pid() decides if the pid is to be discarded according
305 * to caller's programs selection
306 * @param ts : - TS context
308 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
311 static int discard_pid(MpegTSContext *ts, unsigned int pid)
314 int used = 0, discarded = 0;
317 /* If none of the programs have .discard=AVDISCARD_ALL then there's
318 * no way we have to discard this packet
320 for (k = 0; k < ts->stream->nb_programs; k++) {
321 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
324 if (k == ts->stream->nb_programs)
327 for(i=0; i<ts->nb_prg; i++) {
329 for(j=0; j<p->nb_pids; j++) {
330 if(p->pids[j] != pid)
332 //is program with id p->id set to be discarded?
333 for(k=0; k<ts->stream->nb_programs; k++) {
334 if(ts->stream->programs[k]->id == p->id) {
335 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
344 return !used && discarded;
348 * Assemble PES packets out of TS packets, and then call the "section_cb"
349 * function when they are complete.
351 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
352 const uint8_t *buf, int buf_size, int is_start)
354 MpegTSContext *ts = s->priv_data;
355 MpegTSSectionFilter *tss = &tss1->u.section_filter;
359 memcpy(tss->section_buf, buf, buf_size);
360 tss->section_index = buf_size;
361 tss->section_h_size = -1;
362 tss->end_of_section_reached = 0;
364 if (tss->end_of_section_reached)
366 len = 4096 - tss->section_index;
369 memcpy(tss->section_buf + tss->section_index, buf, len);
370 tss->section_index += len;
373 /* compute section length if possible */
374 if (tss->section_h_size == -1 && tss->section_index >= 3) {
375 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
378 tss->section_h_size = len;
381 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
383 tss->end_of_section_reached = 1;
386 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
388 ts->crc_validity[ tss1->pid ] = 100;
389 }else if(ts->crc_validity[ tss1->pid ] > -10){
390 ts->crc_validity[ tss1->pid ]--;
395 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
399 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
400 SectionCallback *section_cb, void *opaque,
404 MpegTSFilter *filter;
405 MpegTSSectionFilter *sec;
407 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
409 if (pid >= NB_PID_MAX || ts->pids[pid])
411 filter = av_mallocz(sizeof(MpegTSFilter));
414 ts->pids[pid] = filter;
415 filter->type = MPEGTS_SECTION;
418 filter->last_cc = -1;
419 sec = &filter->u.section_filter;
420 sec->section_cb = section_cb;
421 sec->opaque = opaque;
422 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
423 sec->check_crc = check_crc;
424 if (!sec->section_buf) {
431 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
435 MpegTSFilter *filter;
436 MpegTSPESFilter *pes;
438 if (pid >= NB_PID_MAX || ts->pids[pid])
440 filter = av_mallocz(sizeof(MpegTSFilter));
443 ts->pids[pid] = filter;
444 filter->type = MPEGTS_PES;
447 filter->last_cc = -1;
448 pes = &filter->u.pes_filter;
449 pes->pes_cb = pes_cb;
450 pes->opaque = opaque;
454 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
459 if (filter->type == MPEGTS_SECTION)
460 av_freep(&filter->u.section_filter.section_buf);
461 else if (filter->type == MPEGTS_PES) {
462 PESContext *pes = filter->u.pes_filter.opaque;
463 av_buffer_unref(&pes->buffer);
464 /* referenced private data will be freed later in
465 * avformat_close_input */
466 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
467 av_freep(&filter->u.pes_filter.opaque);
472 ts->pids[pid] = NULL;
475 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
476 int stat[TS_MAX_PACKET_SIZE];
480 memset(stat, 0, packet_size*sizeof(*stat));
482 for(i=0; i<size-3; i++){
483 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){
484 int x = i % packet_size;
486 if(stat[x] > best_score){
496 /* autodetect fec presence. Must have at least 1024 bytes */
497 static int get_packet_size(const uint8_t *buf, int size)
499 int score, fec_score, dvhs_score;
501 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
504 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
505 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
506 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
507 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
508 score, dvhs_score, fec_score);
510 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
511 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
512 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
516 typedef struct SectionHeader {
521 uint8_t last_sec_num;
524 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
537 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
543 if ((p + 1) >= p_end)
551 /* read and allocate a DVB string preceded by its length */
552 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
559 len = get8(&p, p_end);
562 if ((p + len) > p_end)
564 str = av_malloc(len + 1);
574 static int parse_section_header(SectionHeader *h,
575 const uint8_t **pp, const uint8_t *p_end)
579 val = get8(pp, p_end);
584 val = get16(pp, p_end);
588 val = get8(pp, p_end);
591 h->version = (val >> 1) & 0x1f;
592 val = get8(pp, p_end);
596 val = get8(pp, p_end);
599 h->last_sec_num = val;
604 uint32_t stream_type;
605 enum AVMediaType codec_type;
606 enum AVCodecID codec_id;
609 static const StreamType ISO_types[] = {
610 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
611 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
612 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
613 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
614 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
615 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
616 /* Makito encoder sets stream type 0x11 for AAC,
617 * so auto-detect LOAS/LATM instead of hardcoding it. */
618 #if !CONFIG_LOAS_DEMUXER
619 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
621 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
622 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
623 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
624 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
625 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
629 static const StreamType HDMV_types[] = {
630 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
631 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
632 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
633 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
634 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
635 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
636 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
637 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
638 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
639 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
644 static const StreamType MISC_types[] = {
645 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
646 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
650 static const StreamType REGD_types[] = {
651 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
652 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
653 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
654 { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
655 { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
656 { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
657 { MKTAG('H','E','V','C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
658 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
659 { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
663 static const StreamType METADATA_types[] = {
664 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
665 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
669 /* descriptor present */
670 static const StreamType DESC_types[] = {
671 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
672 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
673 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
674 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
675 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
679 static void mpegts_find_stream_type(AVStream *st,
680 uint32_t stream_type, const StreamType *types)
682 if (avcodec_is_open(st->codec)) {
683 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
687 for (; types->stream_type; types++) {
688 if (stream_type == types->stream_type) {
689 st->codec->codec_type = types->codec_type;
690 st->codec->codec_id = types->codec_id;
691 st->request_probe = 0;
697 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
698 uint32_t stream_type, uint32_t prog_reg_desc)
700 int old_codec_type= st->codec->codec_type;
701 int old_codec_id = st->codec->codec_id;
703 if (avcodec_is_open(st->codec)) {
704 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
708 avpriv_set_pts_info(st, 33, 1, 90000);
710 st->codec->codec_type = AVMEDIA_TYPE_DATA;
711 st->codec->codec_id = AV_CODEC_ID_NONE;
712 st->need_parsing = AVSTREAM_PARSE_FULL;
714 pes->stream_type = stream_type;
716 av_log(pes->stream, AV_LOG_DEBUG,
717 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
718 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
720 st->codec->codec_tag = pes->stream_type;
722 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
723 if ((prog_reg_desc == AV_RL32("HDMV") ||
724 prog_reg_desc == AV_RL32("HDPR")) &&
725 st->codec->codec_id == AV_CODEC_ID_NONE) {
726 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
727 if (pes->stream_type == 0x83) {
728 // HDMV TrueHD streams also contain an AC3 coded version of the
729 // audio track - add a second stream for this
731 // priv_data cannot be shared between streams
732 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
734 return AVERROR(ENOMEM);
735 memcpy(sub_pes, pes, sizeof(*sub_pes));
737 sub_st = avformat_new_stream(pes->stream, NULL);
740 return AVERROR(ENOMEM);
743 sub_st->id = pes->pid;
744 avpriv_set_pts_info(sub_st, 33, 1, 90000);
745 sub_st->priv_data = sub_pes;
746 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
747 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
748 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
749 sub_pes->sub_st = pes->sub_st = sub_st;
752 if (st->codec->codec_id == AV_CODEC_ID_NONE)
753 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
754 if (st->codec->codec_id == AV_CODEC_ID_NONE){
755 st->codec->codec_id = old_codec_id;
756 st->codec->codec_type= old_codec_type;
762 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
766 pkt->buf = pes->buffer;
767 pkt->data = pes->buffer->data;
768 pkt->size = pes->data_index;
770 if(pes->total_size != MAX_PES_PAYLOAD &&
771 pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
772 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
773 pes->flags |= AV_PKT_FLAG_CORRUPT;
775 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
777 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
778 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
779 pkt->stream_index = pes->sub_st->index;
781 pkt->stream_index = pes->st->index;
784 /* store position of first TS packet of this PES packet */
785 pkt->pos = pes->ts_packet_pos;
786 pkt->flags = pes->flags;
788 /* reset pts values */
789 pes->pts = AV_NOPTS_VALUE;
790 pes->dts = AV_NOPTS_VALUE;
796 static uint64_t get_ts64(GetBitContext *gb, int bits)
798 if (get_bits_left(gb) < bits)
799 return AV_NOPTS_VALUE;
800 return get_bits64(gb, bits);
803 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
806 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
807 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
808 int dts_flag = -1, cts_flag = -1;
809 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
811 init_get_bits(&gb, buf, buf_size*8);
813 if (sl->use_au_start)
814 au_start_flag = get_bits1(&gb);
816 au_end_flag = get_bits1(&gb);
817 if (!sl->use_au_start && !sl->use_au_end)
818 au_start_flag = au_end_flag = 1;
820 ocr_flag = get_bits1(&gb);
822 idle_flag = get_bits1(&gb);
824 padding_flag = get_bits1(&gb);
826 padding_bits = get_bits(&gb, 3);
828 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
829 if (sl->packet_seq_num_len)
830 skip_bits_long(&gb, sl->packet_seq_num_len);
831 if (sl->degr_prior_len)
833 skip_bits(&gb, sl->degr_prior_len);
835 skip_bits_long(&gb, sl->ocr_len);
837 if (sl->use_rand_acc_pt)
839 if (sl->au_seq_num_len > 0)
840 skip_bits_long(&gb, sl->au_seq_num_len);
841 if (sl->use_timestamps) {
842 dts_flag = get_bits1(&gb);
843 cts_flag = get_bits1(&gb);
846 if (sl->inst_bitrate_len)
847 inst_bitrate_flag = get_bits1(&gb);
849 dts = get_ts64(&gb, sl->timestamp_len);
851 cts = get_ts64(&gb, sl->timestamp_len);
853 skip_bits_long(&gb, sl->au_len);
854 if (inst_bitrate_flag)
855 skip_bits_long(&gb, sl->inst_bitrate_len);
858 if (dts != AV_NOPTS_VALUE)
860 if (cts != AV_NOPTS_VALUE)
863 if (sl->timestamp_len && sl->timestamp_res)
864 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
866 return (get_bits_count(&gb) + 7) >> 3;
869 /* return non zero if a packet could be constructed */
870 static int mpegts_push_data(MpegTSFilter *filter,
871 const uint8_t *buf, int buf_size, int is_start,
872 int64_t pos, int64_t pcr)
874 PESContext *pes = filter->u.pes_filter.opaque;
875 MpegTSContext *ts = pes->ts;
886 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
887 new_pes_packet(pes, ts->pkt);
890 pes->state = MPEGTS_HEADER;
892 pes->ts_packet_pos = pos;
895 while (buf_size > 0) {
898 len = PES_START_SIZE - pes->data_index;
901 memcpy(pes->header + pes->data_index, p, len);
902 pes->data_index += len;
905 if (pes->data_index == PES_START_SIZE) {
906 /* we got all the PES or section header. We can now
908 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
909 pes->header[2] == 0x01) {
910 /* it must be an mpeg2 PES stream */
911 code = pes->header[3] | 0x100;
912 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
914 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
915 (!pes->sub_st || pes->sub_st->discard == AVDISCARD_ALL)) ||
916 code == 0x1be) /* padding_stream */
919 /* stream not present in PMT */
921 pes->st = avformat_new_stream(ts->stream, NULL);
923 return AVERROR(ENOMEM);
924 pes->st->id = pes->pid;
925 mpegts_set_stream_info(pes->st, pes, 0, 0);
928 pes->total_size = AV_RB16(pes->header + 4);
929 /* NOTE: a zero total size means the PES size is
931 if (!pes->total_size)
932 pes->total_size = MAX_PES_PAYLOAD;
934 /* allocate pes buffer */
935 pes->buffer = av_buffer_alloc(pes->total_size +
936 FF_INPUT_BUFFER_PADDING_SIZE);
938 return AVERROR(ENOMEM);
940 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
941 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
942 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
943 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
944 pes->state = MPEGTS_PESHEADER;
945 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
946 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
947 pes->pid, pes->stream_type);
948 pes->st->request_probe= 1;
951 pes->state = MPEGTS_PAYLOAD;
955 /* otherwise, it should be a table */
958 pes->state = MPEGTS_SKIP;
963 /**********************************************/
964 /* PES packing parsing */
965 case MPEGTS_PESHEADER:
966 len = PES_HEADER_SIZE - pes->data_index;
971 memcpy(pes->header + pes->data_index, p, len);
972 pes->data_index += len;
975 if (pes->data_index == PES_HEADER_SIZE) {
976 pes->pes_header_size = pes->header[8] + 9;
977 pes->state = MPEGTS_PESHEADER_FILL;
980 case MPEGTS_PESHEADER_FILL:
981 len = pes->pes_header_size - pes->data_index;
986 memcpy(pes->header + pes->data_index, p, len);
987 pes->data_index += len;
990 if (pes->data_index == pes->pes_header_size) {
992 unsigned int flags, pes_ext, skip;
994 flags = pes->header[7];
996 pes->pts = AV_NOPTS_VALUE;
997 pes->dts = AV_NOPTS_VALUE;
998 if ((flags & 0xc0) == 0x80) {
999 pes->pts = ff_parse_pes_pts(r);
1000 /* video pts is not monotonic, can't be used for dts */
1001 if (pes->st->codec->codec_type != AVMEDIA_TYPE_VIDEO)
1002 pes->dts = pes->pts;
1004 } else if ((flags & 0xc0) == 0xc0) {
1005 pes->pts = ff_parse_pes_pts(r);
1007 pes->dts = ff_parse_pes_pts(r);
1010 pes->extended_stream_id = -1;
1011 if (flags & 0x01) { /* PES extension */
1013 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1014 skip = (pes_ext >> 4) & 0xb;
1017 if ((pes_ext & 0x41) == 0x01 &&
1018 (r + 2) <= (pes->header + pes->pes_header_size)) {
1019 /* PES extension 2 */
1020 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1021 pes->extended_stream_id = r[1];
1025 /* we got the full header. We parse it and get the payload */
1026 pes->state = MPEGTS_PAYLOAD;
1027 pes->data_index = 0;
1028 if (pes->stream_type == 0x12 && buf_size > 0) {
1029 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
1030 pes->pes_header_size += sl_header_bytes;
1031 p += sl_header_bytes;
1032 buf_size -= sl_header_bytes;
1034 if (pes->stream_type == 0x15 && buf_size >= 5) {
1035 /* skip metadata access unit header */
1036 pes->pes_header_size += 5;
1040 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1041 AVProgram *p = NULL;
1042 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1043 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1044 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1045 if (f && f->type == MPEGTS_PES) {
1046 PESContext *pcrpes = f->u.pes_filter.opaque;
1047 if (pcrpes && pcrpes->last_pcr != -1 && pcrpes->st && pcrpes->st->discard != AVDISCARD_ALL) {
1048 // teletext packets do not always have correct timestamps,
1049 // the standard says they should be handled after 40.6 ms at most,
1050 // and the pcr error to this packet should be no more than 100 ms.
1051 // TODO: we should interpolate the PCR, not just use the last one
1052 int64_t pcr = pcrpes->last_pcr / 300;
1053 pes->st->pts_wrap_reference = pcrpes->st->pts_wrap_reference;
1054 pes->st->pts_wrap_behavior = pcrpes->st->pts_wrap_behavior;
1055 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1056 pes->pts = pes->dts = pcr;
1057 } else if (pes->dts > pcr + 3654 + 9000) {
1058 pes->pts = pes->dts = pcr + 3654 + 9000;
1068 case MPEGTS_PAYLOAD:
1069 if (buf_size > 0 && pes->buffer) {
1070 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
1071 new_pes_packet(pes, ts->pkt);
1072 pes->total_size = MAX_PES_PAYLOAD;
1073 pes->buffer = av_buffer_alloc(pes->total_size + FF_INPUT_BUFFER_PADDING_SIZE);
1075 return AVERROR(ENOMEM);
1077 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
1078 // pes packet size is < ts size packet and pes data is padded with 0xff
1079 // not sure if this is legal in ts but see issue #2392
1080 buf_size = pes->total_size;
1082 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1083 pes->data_index += buf_size;
1086 /* emit complete packets with known packet size
1087 * decreases demuxer delay for infrequent packets like subtitles from
1088 * a couple of seconds to milliseconds for properly muxed files.
1089 * total_size is the number of bytes following pes_packet_length
1090 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1091 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1092 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1094 new_pes_packet(pes, ts->pkt);
1106 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1111 /* if no pid found, then add a pid context */
1112 pes = av_mallocz(sizeof(PESContext));
1116 pes->stream = ts->stream;
1118 pes->pcr_pid = pcr_pid;
1119 pes->state = MPEGTS_SKIP;
1120 pes->pts = AV_NOPTS_VALUE;
1121 pes->dts = AV_NOPTS_VALUE;
1123 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1136 Mp4Descr *active_descr;
1138 int max_descr_count;
1140 } MP4DescrParseContext;
1142 static int init_MP4DescrParseContext(
1143 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
1144 unsigned size, Mp4Descr *descr, int max_descr_count)
1148 return AVERROR_INVALIDDATA;
1150 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
1151 NULL, NULL, NULL, NULL)) < 0)
1158 d->active_descr = NULL;
1159 d->max_descr_count = max_descr_count;
1164 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
1165 int64_t new_off = avio_tell(pb);
1166 (*len) -= new_off - *off;
1170 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1173 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1176 if (parse_mp4_descr(d, off, len, 0) < 0)
1178 update_offsets(&d->pb, &off, &len);
1183 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1185 avio_rb16(&d->pb); // ID
1191 update_offsets(&d->pb, &off, &len);
1192 return parse_mp4_descr_arr(d, off, len);
1195 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1200 id_flags = avio_rb16(&d->pb);
1201 if (!(id_flags & 0x0020)) { //URL_Flag
1202 update_offsets(&d->pb, &off, &len);
1203 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1209 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1212 if (d->descr_count >= d->max_descr_count)
1214 ff_mp4_parse_es_descr(&d->pb, &es_id);
1215 d->active_descr = d->descr + (d->descr_count++);
1217 d->active_descr->es_id = es_id;
1218 update_offsets(&d->pb, &off, &len);
1219 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1220 update_offsets(&d->pb, &off, &len);
1222 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1223 d->active_descr = NULL;
1227 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1229 Mp4Descr *descr = d->active_descr;
1232 d->active_descr->dec_config_descr = av_malloc(len);
1233 if (!descr->dec_config_descr)
1234 return AVERROR(ENOMEM);
1235 descr->dec_config_descr_len = len;
1236 avio_read(&d->pb, descr->dec_config_descr, len);
1240 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1242 Mp4Descr *descr = d->active_descr;
1247 predefined = avio_r8(&d->pb);
1250 int flags = avio_r8(&d->pb);
1251 descr->sl.use_au_start = !!(flags & 0x80);
1252 descr->sl.use_au_end = !!(flags & 0x40);
1253 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1254 descr->sl.use_padding = !!(flags & 0x08);
1255 descr->sl.use_timestamps = !!(flags & 0x04);
1256 descr->sl.use_idle = !!(flags & 0x02);
1257 descr->sl.timestamp_res = avio_rb32(&d->pb);
1259 descr->sl.timestamp_len = avio_r8(&d->pb);
1260 if (descr->sl.timestamp_len > 64) {
1261 avpriv_request_sample(NULL, "timestamp_len > 64");
1262 descr->sl.timestamp_len = 64;
1263 return AVERROR_PATCHWELCOME;
1265 descr->sl.ocr_len = avio_r8(&d->pb);
1266 descr->sl.au_len = avio_r8(&d->pb);
1267 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1268 lengths = avio_rb16(&d->pb);
1269 descr->sl.degr_prior_len = lengths >> 12;
1270 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1271 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1273 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1278 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1281 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1282 update_offsets(&d->pb, &off, &len);
1283 if (len < 0 || len1 > len || len1 <= 0) {
1284 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1288 if (d->level++ >= MAX_LEVEL) {
1289 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1293 if (target_tag && tag != target_tag) {
1294 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1300 parse_MP4IODescrTag(d, off, len1);
1303 parse_MP4ODescrTag(d, off, len1);
1306 parse_MP4ESDescrTag(d, off, len1);
1308 case MP4DecConfigDescrTag:
1309 parse_MP4DecConfigDescrTag(d, off, len1);
1312 parse_MP4SLDescrTag(d, off, len1);
1318 avio_seek(&d->pb, off + len1, SEEK_SET);
1322 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1323 Mp4Descr *descr, int *descr_count, int max_descr_count)
1325 MP4DescrParseContext d;
1326 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1329 parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1331 *descr_count = d.descr_count;
1335 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1336 Mp4Descr *descr, int *descr_count, int max_descr_count)
1338 MP4DescrParseContext d;
1339 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1342 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1344 *descr_count = d.descr_count;
1348 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1350 MpegTSContext *ts = filter->u.section_filter.opaque;
1352 const uint8_t *p, *p_end;
1354 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1355 int mp4_descr_count = 0;
1357 AVFormatContext *s = ts->stream;
1359 p_end = section + section_len - 4;
1361 if (parse_section_header(&h, &p, p_end) < 0)
1363 if (h.tid != M4OD_TID)
1366 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1368 for (pid = 0; pid < NB_PID_MAX; pid++) {
1371 for (i = 0; i < mp4_descr_count; i++) {
1374 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1376 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1377 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1380 pes = ts->pids[pid]->u.pes_filter.opaque;
1386 pes->sl = mp4_descr[i].sl;
1388 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1389 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1390 ff_mp4_read_dec_config_descr(s, st, &pb);
1391 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1392 st->codec->extradata_size > 0)
1393 st->need_parsing = 0;
1394 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1395 st->codec->extradata_size > 0)
1396 st->need_parsing = 0;
1398 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1399 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO) {
1400 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1401 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE) {
1402 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1403 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN) {
1404 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1408 for (i = 0; i < mp4_descr_count; i++)
1409 av_free(mp4_descr[i].dec_config_descr);
1412 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1413 const uint8_t **pp, const uint8_t *desc_list_end,
1414 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1417 const uint8_t *desc_end;
1418 int desc_len, desc_tag, desc_es_id;
1422 desc_tag = get8(pp, desc_list_end);
1425 desc_len = get8(pp, desc_list_end);
1428 desc_end = *pp + desc_len;
1429 if (desc_end > desc_list_end)
1432 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1434 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1435 stream_type == STREAM_TYPE_PRIVATE_DATA)
1436 mpegts_find_stream_type(st, desc_tag, DESC_types);
1439 case 0x1E: /* SL descriptor */
1440 desc_es_id = get16(pp, desc_end);
1441 if (ts && ts->pids[pid])
1442 ts->pids[pid]->es_id = desc_es_id;
1443 for (i = 0; i < mp4_descr_count; i++)
1444 if (mp4_descr[i].dec_config_descr_len &&
1445 mp4_descr[i].es_id == desc_es_id) {
1447 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1448 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1449 ff_mp4_read_dec_config_descr(fc, st, &pb);
1450 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1451 st->codec->extradata_size > 0)
1452 st->need_parsing = 0;
1453 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1454 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1457 case 0x1F: /* FMC descriptor */
1458 get16(pp, desc_end);
1459 if (mp4_descr_count > 0 && (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe>0) &&
1460 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1462 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1463 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1464 ff_mp4_read_dec_config_descr(fc, st, &pb);
1465 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1466 st->codec->extradata_size > 0){
1467 st->request_probe= st->need_parsing = 0;
1468 st->codec->codec_type= AVMEDIA_TYPE_AUDIO;
1472 case 0x56: /* DVB teletext descriptor */
1474 uint8_t *extradata = NULL;
1475 int language_count = desc_len / 5;
1477 if (desc_len > 0 && desc_len % 5 != 0)
1478 return AVERROR_INVALIDDATA;
1480 if (language_count > 0) {
1481 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1482 if (language_count > sizeof(language) / 4) {
1483 language_count = sizeof(language) / 4;
1486 if (st->codec->extradata == NULL) {
1487 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1488 return AVERROR(ENOMEM);
1492 if (st->codec->extradata_size < language_count * 2)
1493 return AVERROR_INVALIDDATA;
1495 extradata = st->codec->extradata;
1497 for (i = 0; i < language_count; i++) {
1498 language[i * 4 + 0] = get8(pp, desc_end);
1499 language[i * 4 + 1] = get8(pp, desc_end);
1500 language[i * 4 + 2] = get8(pp, desc_end);
1501 language[i * 4 + 3] = ',';
1503 memcpy(extradata, *pp, 2);
1509 language[i * 4 - 1] = 0;
1510 av_dict_set(&st->metadata, "language", language, 0);
1514 case 0x59: /* subtitling descriptor */
1516 /* 8 bytes per DVB subtitle substream data:
1517 * ISO_639_language_code (3 bytes),
1518 * subtitling_type (1 byte),
1519 * composition_page_id (2 bytes),
1520 * ancillary_page_id (2 bytes) */
1521 int language_count = desc_len / 8;
1523 if (desc_len > 0 && desc_len % 8 != 0)
1524 return AVERROR_INVALIDDATA;
1526 if (language_count > 1) {
1527 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1530 if (language_count > 0) {
1533 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1534 if (language_count > sizeof(language) / 4) {
1535 language_count = sizeof(language) / 4;
1538 if (st->codec->extradata == NULL) {
1539 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1540 return AVERROR(ENOMEM);
1544 if (st->codec->extradata_size < language_count * 5)
1545 return AVERROR_INVALIDDATA;
1547 extradata = st->codec->extradata;
1549 for (i = 0; i < language_count; i++) {
1550 language[i * 4 + 0] = get8(pp, desc_end);
1551 language[i * 4 + 1] = get8(pp, desc_end);
1552 language[i * 4 + 2] = get8(pp, desc_end);
1553 language[i * 4 + 3] = ',';
1555 /* hearing impaired subtitles detection using subtitling_type */
1557 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1558 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1559 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1560 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1561 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1562 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1563 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1567 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1568 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1574 language[i * 4 - 1] = 0;
1575 av_dict_set(&st->metadata, "language", language, 0);
1579 case 0x0a: /* ISO 639 language descriptor */
1580 for (i = 0; i + 4 <= desc_len; i += 4) {
1581 language[i + 0] = get8(pp, desc_end);
1582 language[i + 1] = get8(pp, desc_end);
1583 language[i + 2] = get8(pp, desc_end);
1584 language[i + 3] = ',';
1585 switch (get8(pp, desc_end)) {
1586 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1587 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1588 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1592 language[i - 1] = 0;
1593 av_dict_set(&st->metadata, "language", language, 0);
1596 case 0x05: /* registration descriptor */
1597 st->codec->codec_tag = bytestream_get_le32(pp);
1598 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1599 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1600 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1602 case 0x52: /* stream identifier descriptor */
1603 st->stream_identifier = 1 + get8(pp, desc_end);
1605 case 0x26: /* metadata descriptor */
1606 if (get16(pp, desc_end) == 0xFFFF)
1608 if (get8(pp, desc_end) == 0xFF) {
1609 st->codec->codec_tag = bytestream_get_le32(pp);
1610 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1611 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1621 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1623 MpegTSContext *ts = filter->u.section_filter.opaque;
1624 SectionHeader h1, *h = &h1;
1627 const uint8_t *p, *p_end, *desc_list_end;
1628 int program_info_length, pcr_pid, pid, stream_type;
1630 uint32_t prog_reg_desc = 0; /* registration descriptor */
1632 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1633 int mp4_descr_count = 0;
1636 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1637 hex_dump_debug(ts->stream, section, section_len);
1639 p_end = section + section_len - 4;
1641 if (parse_section_header(h, &p, p_end) < 0)
1644 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1645 h->id, h->sec_num, h->last_sec_num);
1647 if (h->tid != PMT_TID)
1650 clear_program(ts, h->id);
1651 pcr_pid = get16(&p, p_end);
1655 add_pid_to_pmt(ts, h->id, pcr_pid);
1656 set_pcr_pid(ts->stream, h->id, pcr_pid);
1658 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1660 program_info_length = get16(&p, p_end);
1661 if (program_info_length < 0)
1663 program_info_length &= 0xfff;
1664 while(program_info_length >= 2) {
1666 tag = get8(&p, p_end);
1667 len = get8(&p, p_end);
1669 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1671 if(len > program_info_length - 2)
1672 //something else is broken, exit the program_descriptors_loop
1674 program_info_length -= len + 2;
1675 if (tag == 0x1d) { // IOD descriptor
1676 get8(&p, p_end); // scope
1677 get8(&p, p_end); // label
1679 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1680 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1681 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1682 prog_reg_desc = bytestream_get_le32(&p);
1687 p += program_info_length;
1691 // stop parsing after pmt, we found header
1692 if (!ts->stream->nb_streams)
1695 set_pmt_found(ts, h->id);
1700 stream_type = get8(&p, p_end);
1701 if (stream_type < 0)
1703 pid = get16(&p, p_end);
1707 if (pid == ts->current_pid)
1710 /* now create stream */
1711 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1712 pes = ts->pids[pid]->u.pes_filter.opaque;
1714 pes->st = avformat_new_stream(pes->stream, NULL);
1717 pes->st->id = pes->pid;
1720 } else if (stream_type != 0x13) {
1721 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1722 pes = add_pes_stream(ts, pid, pcr_pid);
1724 st = avformat_new_stream(pes->stream, NULL);
1730 int idx = ff_find_stream_index(ts->stream, pid);
1732 st = ts->stream->streams[idx];
1734 st = avformat_new_stream(ts->stream, NULL);
1738 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1745 if (pes && !pes->stream_type)
1746 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1748 add_pid_to_pmt(ts, h->id, pid);
1750 ff_program_add_stream_index(ts->stream, h->id, st->index);
1752 desc_list_len = get16(&p, p_end);
1753 if (desc_list_len < 0)
1755 desc_list_len &= 0xfff;
1756 desc_list_end = p + desc_list_len;
1757 if (desc_list_end > p_end)
1760 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1761 mp4_descr, mp4_descr_count, pid, ts) < 0)
1764 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1765 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1766 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1773 for (i = 0; i < mp4_descr_count; i++)
1774 av_free(mp4_descr[i].dec_config_descr);
1777 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1779 MpegTSContext *ts = filter->u.section_filter.opaque;
1780 SectionHeader h1, *h = &h1;
1781 const uint8_t *p, *p_end;
1785 av_dlog(ts->stream, "PAT:\n");
1786 hex_dump_debug(ts->stream, section, section_len);
1788 p_end = section + section_len - 4;
1790 if (parse_section_header(h, &p, p_end) < 0)
1792 if (h->tid != PAT_TID)
1795 ts->stream->ts_id = h->id;
1799 sid = get16(&p, p_end);
1802 pmt_pid = get16(&p, p_end);
1807 if (pmt_pid == ts->current_pid)
1810 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1812 if (sid == 0x0000) {
1815 MpegTSFilter *fil = ts->pids[pmt_pid];
1816 program = av_new_program(ts->stream, sid);
1817 program->program_num = sid;
1818 program->pmt_pid = pmt_pid;
1820 if ( fil->type != MPEGTS_SECTION
1821 || fil->pid != pmt_pid
1822 || fil->u.section_filter.section_cb != pmt_cb)
1823 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1825 if (!ts->pids[pmt_pid])
1826 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1827 add_pat_entry(ts, sid);
1828 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1829 add_pid_to_pmt(ts, sid, pmt_pid);
1835 for (j=0; j<ts->stream->nb_programs; j++) {
1836 for (i=0; i<ts->nb_prg; i++)
1837 if (ts->prg[i].id == ts->stream->programs[j]->id)
1840 clear_avprogram(ts, ts->stream->programs[j]->id);
1845 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1847 MpegTSContext *ts = filter->u.section_filter.opaque;
1848 SectionHeader h1, *h = &h1;
1849 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1850 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1851 char *name, *provider_name;
1853 av_dlog(ts->stream, "SDT:\n");
1854 hex_dump_debug(ts->stream, section, section_len);
1856 p_end = section + section_len - 4;
1858 if (parse_section_header(h, &p, p_end) < 0)
1860 if (h->tid != SDT_TID)
1862 onid = get16(&p, p_end);
1865 val = get8(&p, p_end);
1869 sid = get16(&p, p_end);
1872 val = get8(&p, p_end);
1875 desc_list_len = get16(&p, p_end);
1876 if (desc_list_len < 0)
1878 desc_list_len &= 0xfff;
1879 desc_list_end = p + desc_list_len;
1880 if (desc_list_end > p_end)
1883 desc_tag = get8(&p, desc_list_end);
1886 desc_len = get8(&p, desc_list_end);
1887 desc_end = p + desc_len;
1888 if (desc_end > desc_list_end)
1891 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1892 desc_tag, desc_len);
1896 service_type = get8(&p, p_end);
1897 if (service_type < 0)
1899 provider_name = getstr8(&p, p_end);
1902 name = getstr8(&p, p_end);
1904 AVProgram *program = av_new_program(ts->stream, sid);
1906 av_dict_set(&program->metadata, "service_name", name, 0);
1907 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1911 av_free(provider_name);
1922 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1923 const uint8_t *packet);
1925 /* handle one TS packet */
1926 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1928 AVFormatContext *s = ts->stream;
1930 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1931 has_adaptation, has_payload;
1932 const uint8_t *p, *p_end;
1935 pid = AV_RB16(packet + 1) & 0x1fff;
1936 if(pid && discard_pid(ts, pid))
1938 is_start = packet[1] & 0x40;
1939 tss = ts->pids[pid];
1940 if (ts->auto_guess && tss == NULL && is_start) {
1941 add_pes_stream(ts, pid, -1);
1942 tss = ts->pids[pid];
1946 ts->current_pid = pid;
1948 afc = (packet[3] >> 4) & 3;
1949 if (afc == 0) /* reserved value */
1951 has_adaptation = afc & 2;
1952 has_payload = afc & 1;
1953 is_discontinuity = has_adaptation
1954 && packet[4] != 0 /* with length > 0 */
1955 && (packet[5] & 0x80); /* and discontinuity indicated */
1957 /* continuity check (currently not used) */
1958 cc = (packet[3] & 0xf);
1959 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1960 cc_ok = pid == 0x1FFF // null packet PID
1963 || expected_cc == cc;
1967 av_log(ts->stream, AV_LOG_DEBUG,
1968 "Continuity check failed for pid %d expected %d got %d\n",
1969 pid, expected_cc, cc);
1970 if(tss->type == MPEGTS_PES) {
1971 PESContext *pc = tss->u.pes_filter.opaque;
1972 pc->flags |= AV_PKT_FLAG_CORRUPT;
1979 if (has_adaptation) {
1980 /* skip adaptation field */
1983 /* if past the end of packet, ignore */
1984 p_end = packet + TS_PACKET_SIZE;
1988 pos = avio_tell(ts->stream->pb);
1990 av_assert0(pos >= TS_PACKET_SIZE);
1991 ts->pos47_full = pos - TS_PACKET_SIZE;
1994 if (tss->type == MPEGTS_SECTION) {
1996 /* pointer field present */
1998 if (p + len > p_end)
2001 /* write remaining section bytes */
2002 write_section_data(s, tss,
2004 /* check whether filter has been closed */
2010 write_section_data(s, tss,
2015 write_section_data(s, tss,
2020 // stop find_stream_info from waiting for more streams
2021 // when all programs have received a PMT
2022 if(ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2024 for(i=0; i<ts->nb_prg; i++) {
2025 if (!ts->prg[i].pmt_found)
2028 if (i == ts->nb_prg && ts->nb_prg > 0) {
2029 if (ts->stream->nb_streams > 1 || pos > 100000) {
2030 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2031 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2041 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2042 pcr = pcr_h * 300 + pcr_l;
2043 // Note: The position here points actually behind the current packet.
2044 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2045 pos - ts->raw_packet_size, pcr)) < 0)
2052 static void reanalyze(MpegTSContext *ts) {
2053 AVIOContext *pb = ts->stream->pb;
2054 int64_t pos = avio_tell(pb);
2057 pos -= ts->pos47_full;
2058 if (pos == TS_PACKET_SIZE) {
2059 ts->size_stat[0] ++;
2060 } else if (pos == TS_DVHS_PACKET_SIZE) {
2061 ts->size_stat[1] ++;
2062 } else if (pos == TS_FEC_PACKET_SIZE) {
2063 ts->size_stat[2] ++;
2066 ts->size_stat_count ++;
2067 if(ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2069 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2070 newsize = TS_PACKET_SIZE;
2071 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2072 newsize = TS_DVHS_PACKET_SIZE;
2073 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2074 newsize = TS_FEC_PACKET_SIZE;
2076 if (newsize && newsize != ts->raw_packet_size) {
2077 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2078 ts->raw_packet_size = newsize;
2080 ts->size_stat_count = 0;
2081 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2085 /* XXX: try to find a better synchro over several packets (use
2086 get_packet_size() ?) */
2087 static int mpegts_resync(AVFormatContext *s)
2089 AVIOContext *pb = s->pb;
2092 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
2097 avio_seek(pb, -1, SEEK_CUR);
2098 reanalyze(s->priv_data);
2102 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
2107 /* return -1 if error or EOF. Return 0 if OK. */
2108 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size, const uint8_t **data)
2110 AVIOContext *pb = s->pb;
2114 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2115 if (len != TS_PACKET_SIZE)
2116 return len < 0 ? len : AVERROR_EOF;
2117 /* check packet sync byte */
2118 if ((*data)[0] != 0x47) {
2119 /* find a new packet start */
2120 uint64_t pos = avio_tell(pb);
2121 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2123 if (mpegts_resync(s) < 0)
2124 return AVERROR(EAGAIN);
2134 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2136 AVIOContext *pb = s->pb;
2137 int skip = raw_packet_size - TS_PACKET_SIZE;
2139 avio_skip(pb, skip);
2142 static int handle_packets(MpegTSContext *ts, int nb_packets)
2144 AVFormatContext *s = ts->stream;
2145 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2146 const uint8_t *data;
2147 int packet_num, ret = 0;
2149 if (avio_tell(s->pb) != ts->last_pos) {
2151 av_dlog(ts->stream, "Skipping after seek\n");
2152 /* seek detected, flush pes buffer */
2153 for (i = 0; i < NB_PID_MAX; i++) {
2155 if (ts->pids[i]->type == MPEGTS_PES) {
2156 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2157 av_buffer_unref(&pes->buffer);
2158 pes->data_index = 0;
2159 pes->state = MPEGTS_SKIP; /* skip until pes header */
2162 ts->pids[i]->last_cc = -1;
2169 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2172 if (nb_packets != 0 && packet_num >= nb_packets ||
2173 ts->stop_parse > 1) {
2174 ret = AVERROR(EAGAIN);
2177 if (ts->stop_parse > 0)
2180 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2183 ret = handle_packet(ts, data);
2184 finished_reading_packet(s, ts->raw_packet_size);
2188 ts->last_pos = avio_tell(s->pb);
2192 static int mpegts_probe(AVProbeData *p)
2194 const int size= p->buf_size;
2198 int check_count= size / TS_FEC_PACKET_SIZE;
2199 #define CHECK_COUNT 10
2200 #define CHECK_BLOCK 100
2202 if (check_count < CHECK_COUNT)
2205 for (i=0; i<check_count; i+=CHECK_BLOCK){
2206 int left = FFMIN(check_count - i, CHECK_BLOCK);
2207 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2208 int dvhs_score= analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2209 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2210 score = FFMAX3(score, dvhs_score, fec_score);
2212 maxscore = FFMAX(maxscore, score);
2215 sumscore = sumscore*CHECK_COUNT/check_count;
2216 maxscore = maxscore*CHECK_COUNT/CHECK_BLOCK;
2218 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2220 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2221 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2225 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2226 (-1) if not available */
2227 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2228 const uint8_t *packet)
2230 int afc, len, flags;
2234 afc = (packet[3] >> 4) & 3;
2244 if (!(flags & 0x10))
2249 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
2250 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2254 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2256 /* NOTE: We attempt to seek on non-seekable files as well, as the
2257 * probe buffer usually is big enough. Only warn if the seek failed
2258 * on files where the seek should work. */
2259 if (avio_seek(pb, pos, SEEK_SET) < 0)
2260 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2263 static int mpegts_read_header(AVFormatContext *s)
2265 MpegTSContext *ts = s->priv_data;
2266 AVIOContext *pb = s->pb;
2267 uint8_t buf[8*1024]={0};
2271 ffio_ensure_seekback(pb, s->probesize);
2273 /* read the first 8192 bytes to get packet size */
2274 pos = avio_tell(pb);
2275 len = avio_read(pb, buf, sizeof(buf));
2276 ts->raw_packet_size = get_packet_size(buf, len);
2277 if (ts->raw_packet_size <= 0) {
2278 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2279 ts->raw_packet_size = TS_PACKET_SIZE;
2284 if (s->iformat == &ff_mpegts_demuxer) {
2287 /* first do a scan to get all the services */
2288 seek_back(s, pb, pos);
2290 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2292 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2294 handle_packets(ts, s->probesize / ts->raw_packet_size);
2295 /* if could not find service, enable auto_guess */
2299 av_dlog(ts->stream, "tuning done\n");
2301 s->ctx_flags |= AVFMTCTX_NOHEADER;
2304 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2305 int64_t pcrs[2], pcr_h;
2306 int packet_count[2];
2307 uint8_t packet[TS_PACKET_SIZE];
2308 const uint8_t *data;
2310 /* only read packets */
2312 st = avformat_new_stream(s, NULL);
2315 avpriv_set_pts_info(st, 60, 1, 27000000);
2316 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2317 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2319 /* we iterate until we find two PCRs to estimate the bitrate */
2324 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2327 pid = AV_RB16(data + 1) & 0x1fff;
2328 if ((pcr_pid == -1 || pcr_pid == pid) &&
2329 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2330 finished_reading_packet(s, ts->raw_packet_size);
2332 packet_count[nb_pcrs] = nb_packets;
2333 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2338 finished_reading_packet(s, ts->raw_packet_size);
2343 /* NOTE1: the bitrate is computed without the FEC */
2344 /* NOTE2: it is only the bitrate of the start of the stream */
2345 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2346 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2347 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
2348 st->codec->bit_rate = s->bit_rate;
2349 st->start_time = ts->cur_pcr;
2350 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2351 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2354 seek_back(s, pb, pos);
2360 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2362 static int mpegts_raw_read_packet(AVFormatContext *s,
2365 MpegTSContext *ts = s->priv_data;
2367 int64_t pcr_h, next_pcr_h, pos;
2368 int pcr_l, next_pcr_l;
2369 uint8_t pcr_buf[12];
2370 const uint8_t *data;
2372 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2373 return AVERROR(ENOMEM);
2374 pkt->pos= avio_tell(s->pb);
2375 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2377 av_free_packet(pkt);
2380 if (data != pkt->data)
2381 memcpy(pkt->data, data, ts->raw_packet_size);
2382 finished_reading_packet(s, ts->raw_packet_size);
2383 if (ts->mpeg2ts_compute_pcr) {
2384 /* compute exact PCR for each packet */
2385 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2386 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2387 pos = avio_tell(s->pb);
2388 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
2389 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2390 avio_read(s->pb, pcr_buf, 12);
2391 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2392 /* XXX: not precise enough */
2393 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2398 avio_seek(s->pb, pos, SEEK_SET);
2399 /* no next PCR found: we use previous increment */
2400 ts->cur_pcr = pcr_h * 300 + pcr_l;
2402 pkt->pts = ts->cur_pcr;
2403 pkt->duration = ts->pcr_incr;
2404 ts->cur_pcr += ts->pcr_incr;
2406 pkt->stream_index = 0;
2410 static int mpegts_read_packet(AVFormatContext *s,
2413 MpegTSContext *ts = s->priv_data;
2418 ret = handle_packets(ts, 0);
2420 av_free_packet(ts->pkt);
2421 /* flush pes data left */
2422 for (i = 0; i < NB_PID_MAX; i++) {
2423 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2424 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2425 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2426 new_pes_packet(pes, pkt);
2427 pes->state = MPEGTS_SKIP;
2435 if (!ret && pkt->size < 0)
2436 ret = AVERROR(EINTR);
2440 static void mpegts_free(MpegTSContext *ts)
2446 for(i=0;i<NB_PID_MAX;i++)
2447 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2450 static int mpegts_read_close(AVFormatContext *s)
2452 MpegTSContext *ts = s->priv_data;
2457 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2458 int64_t *ppos, int64_t pos_limit)
2460 MpegTSContext *ts = s->priv_data;
2461 int64_t pos, timestamp;
2462 uint8_t buf[TS_PACKET_SIZE];
2463 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2464 int pos47 = ts->pos47_full % ts->raw_packet_size;
2465 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2466 while(pos < pos_limit) {
2467 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2468 return AV_NOPTS_VALUE;
2469 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2470 return AV_NOPTS_VALUE;
2471 if (buf[0] != 0x47) {
2472 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2473 if (mpegts_resync(s) < 0)
2474 return AV_NOPTS_VALUE;
2475 pos = avio_tell(s->pb);
2478 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2479 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2483 pos += ts->raw_packet_size;
2486 return AV_NOPTS_VALUE;
2489 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2490 int64_t *ppos, int64_t pos_limit)
2492 MpegTSContext *ts = s->priv_data;
2494 int pos47 = ts->pos47_full % ts->raw_packet_size;
2495 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2496 ff_read_frame_flush(s);
2497 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2498 return AV_NOPTS_VALUE;
2499 while(pos < pos_limit) {
2502 av_init_packet(&pkt);
2503 ret= av_read_frame(s, &pkt);
2505 return AV_NOPTS_VALUE;
2506 av_free_packet(&pkt);
2507 if(pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0){
2508 ff_reduce_index(s, pkt.stream_index);
2509 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2510 if(pkt.stream_index == stream_index && pkt.pos >= *ppos){
2518 return AV_NOPTS_VALUE;
2521 /**************************************************************/
2522 /* parsing functions - called from other demuxers such as RTP */
2524 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2528 ts = av_mallocz(sizeof(MpegTSContext));
2531 /* no stream case, currently used by RTP */
2532 ts->raw_packet_size = TS_PACKET_SIZE;
2535 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2536 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2541 /* return the consumed length if a packet was output, or -1 if no
2543 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2544 const uint8_t *buf, int len)
2552 if (len < TS_PACKET_SIZE)
2554 if (buf[0] != 0x47) {
2558 handle_packet(ts, buf);
2559 buf += TS_PACKET_SIZE;
2560 len -= TS_PACKET_SIZE;
2561 if (ts->stop_parse == 1)
2568 void ff_mpegts_parse_close(MpegTSContext *ts)
2574 AVInputFormat ff_mpegts_demuxer = {
2576 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2577 .priv_data_size = sizeof(MpegTSContext),
2578 .read_probe = mpegts_probe,
2579 .read_header = mpegts_read_header,
2580 .read_packet = mpegts_read_packet,
2581 .read_close = mpegts_read_close,
2582 .read_timestamp = mpegts_get_dts,
2583 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2584 .priv_class = &mpegts_class,
2587 AVInputFormat ff_mpegtsraw_demuxer = {
2588 .name = "mpegtsraw",
2589 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2590 .priv_data_size = sizeof(MpegTSContext),
2591 .read_header = mpegts_read_header,
2592 .read_packet = mpegts_raw_read_packet,
2593 .read_close = mpegts_read_close,
2594 .read_timestamp = mpegts_get_dts,
2595 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2596 .priv_class = &mpegtsraw_class,