2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 //#define USE_SYNCPOINT_SEARCH
24 #include "libavutil/crc.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/avassert.h"
31 #include "libavcodec/bytestream.h"
32 #include "libavcodec/get_bits.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);
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];
95 struct MpegTSContext {
98 AVFormatContext *stream;
99 /** raw packet size, including FEC if present */
104 /** if true, all pids are analyzed to find streams */
107 /** compute exact PCR for each transport stream packet */
108 int mpeg2ts_compute_pcr;
110 int64_t cur_pcr; /**< used to estimate the exact PCR */
111 int pcr_incr; /**< used to estimate the exact PCR */
113 /* data needed to handle file based ts */
114 /** stop parsing loop */
116 /** packet containing Audio/Video data */
118 /** to detect seek */
121 /******************************************/
122 /* private mpegts data */
124 /** structure to keep track of Program->pids mapping */
129 /** filters for various streams specified by PMT + for the PAT and PMT */
130 MpegTSFilter *pids[NB_PID_MAX];
133 static const AVOption options[] = {
134 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
135 {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
139 static const AVClass mpegtsraw_class = {
140 .class_name = "mpegtsraw demuxer",
141 .item_name = av_default_item_name,
143 .version = LIBAVUTIL_VERSION_INT,
146 /* TS stream handling */
151 MPEGTS_PESHEADER_FILL,
156 /* enough for PES header + length */
157 #define PES_START_SIZE 6
158 #define PES_HEADER_SIZE 9
159 #define MAX_PES_HEADER_SIZE (9 + 255)
161 typedef struct PESContext {
163 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
166 AVFormatContext *stream;
168 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
169 enum MpegTSState state;
170 /* used to get the format */
172 int flags; /**< copied to the AVPacket flags */
175 int extended_stream_id;
177 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
178 uint8_t header[MAX_PES_HEADER_SIZE];
183 extern AVInputFormat ff_mpegts_demuxer;
185 static void clear_program(MpegTSContext *ts, unsigned int programid)
189 for(i=0; i<ts->nb_prg; i++)
190 if(ts->prg[i].id == programid)
191 ts->prg[i].nb_pids = 0;
194 static void clear_programs(MpegTSContext *ts)
200 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
203 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
207 p = &ts->prg[ts->nb_prg];
213 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
216 struct Program *p = NULL;
217 for(i=0; i<ts->nb_prg; i++) {
218 if(ts->prg[i].id == programid) {
226 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
228 p->pids[p->nb_pids++] = pid;
231 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
234 for(i=0; i<s->nb_programs; i++) {
235 if(s->programs[i]->id == programid) {
236 s->programs[i]->pcr_pid = pid;
243 * @brief discard_pid() decides if the pid is to be discarded according
244 * to caller's programs selection
245 * @param ts : - TS context
247 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
250 static int discard_pid(MpegTSContext *ts, unsigned int pid)
253 int used = 0, discarded = 0;
255 for(i=0; i<ts->nb_prg; i++) {
257 for(j=0; j<p->nb_pids; j++) {
258 if(p->pids[j] != pid)
260 //is program with id p->id set to be discarded?
261 for(k=0; k<ts->stream->nb_programs; k++) {
262 if(ts->stream->programs[k]->id == p->id) {
263 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
272 return !used && discarded;
276 * Assemble PES packets out of TS packets, and then call the "section_cb"
277 * function when they are complete.
279 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
280 const uint8_t *buf, int buf_size, int is_start)
282 MpegTSSectionFilter *tss = &tss1->u.section_filter;
286 memcpy(tss->section_buf, buf, buf_size);
287 tss->section_index = buf_size;
288 tss->section_h_size = -1;
289 tss->end_of_section_reached = 0;
291 if (tss->end_of_section_reached)
293 len = 4096 - tss->section_index;
296 memcpy(tss->section_buf + tss->section_index, buf, len);
297 tss->section_index += len;
300 /* compute section length if possible */
301 if (tss->section_h_size == -1 && tss->section_index >= 3) {
302 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
305 tss->section_h_size = len;
308 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
309 tss->end_of_section_reached = 1;
310 if (!tss->check_crc ||
311 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
312 tss->section_buf, tss->section_h_size) == 0)
313 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
317 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
318 SectionCallback *section_cb, void *opaque,
322 MpegTSFilter *filter;
323 MpegTSSectionFilter *sec;
325 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
327 if (pid >= NB_PID_MAX || ts->pids[pid])
329 filter = av_mallocz(sizeof(MpegTSFilter));
332 ts->pids[pid] = filter;
333 filter->type = MPEGTS_SECTION;
336 filter->last_cc = -1;
337 sec = &filter->u.section_filter;
338 sec->section_cb = section_cb;
339 sec->opaque = opaque;
340 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
341 sec->check_crc = check_crc;
342 if (!sec->section_buf) {
349 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
353 MpegTSFilter *filter;
354 MpegTSPESFilter *pes;
356 if (pid >= NB_PID_MAX || ts->pids[pid])
358 filter = av_mallocz(sizeof(MpegTSFilter));
361 ts->pids[pid] = filter;
362 filter->type = MPEGTS_PES;
365 filter->last_cc = -1;
366 pes = &filter->u.pes_filter;
367 pes->pes_cb = pes_cb;
368 pes->opaque = opaque;
372 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
377 if (filter->type == MPEGTS_SECTION)
378 av_freep(&filter->u.section_filter.section_buf);
379 else if (filter->type == MPEGTS_PES) {
380 PESContext *pes = filter->u.pes_filter.opaque;
381 av_freep(&pes->buffer);
382 /* referenced private data will be freed later in
383 * avformat_close_input */
384 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
385 av_freep(&filter->u.pes_filter.opaque);
390 ts->pids[pid] = NULL;
393 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
394 int stat[TS_MAX_PACKET_SIZE];
399 memset(stat, 0, packet_size*sizeof(int));
401 for(x=i=0; i<size-3; i++){
402 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){
404 if(stat[x] > best_score){
411 if(x == packet_size) x= 0;
417 /* autodetect fec presence. Must have at least 1024 bytes */
418 static int get_packet_size(const uint8_t *buf, int size)
420 int score, fec_score, dvhs_score;
422 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
425 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
426 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
427 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
428 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
430 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
431 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
432 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
436 typedef struct SectionHeader {
441 uint8_t last_sec_num;
444 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
457 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
463 if ((p + 1) >= p_end)
471 /* read and allocate a DVB string preceded by its length */
472 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
479 len = get8(&p, p_end);
482 if ((p + len) > p_end)
484 str = av_malloc(len + 1);
494 static int parse_section_header(SectionHeader *h,
495 const uint8_t **pp, const uint8_t *p_end)
499 val = get8(pp, p_end);
504 val = get16(pp, p_end);
508 val = get8(pp, p_end);
511 h->version = (val >> 1) & 0x1f;
512 val = get8(pp, p_end);
516 val = get8(pp, p_end);
519 h->last_sec_num = val;
524 uint32_t stream_type;
525 enum AVMediaType codec_type;
526 enum CodecID codec_id;
529 static const StreamType ISO_types[] = {
530 { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
531 { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
532 { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
533 { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
534 { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
535 { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
536 /* Makito encoder sets stream type 0x11 for AAC,
537 * so auto-detect LOAS/LATM instead of hardcoding it. */
538 // { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
539 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
540 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
541 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
545 static const StreamType HDMV_types[] = {
546 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
547 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
548 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
549 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
550 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
551 { 0x85, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS HD */
552 { 0x86, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS HD MASTER*/
553 { 0xa1, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
554 { 0xa2, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS Express Secondary Audio */
555 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
560 static const StreamType MISC_types[] = {
561 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
562 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
566 static const StreamType REGD_types[] = {
567 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
568 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
569 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
570 { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
571 { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
572 { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
573 { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
577 /* descriptor present */
578 static const StreamType DESC_types[] = {
579 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
580 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
581 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
582 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
583 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
587 static void mpegts_find_stream_type(AVStream *st,
588 uint32_t stream_type, const StreamType *types)
590 for (; types->stream_type; types++) {
591 if (stream_type == types->stream_type) {
592 st->codec->codec_type = types->codec_type;
593 st->codec->codec_id = types->codec_id;
594 st->request_probe = 0;
600 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
601 uint32_t stream_type, uint32_t prog_reg_desc)
603 int old_codec_type= st->codec->codec_type;
604 int old_codec_id = st->codec->codec_id;
605 avpriv_set_pts_info(st, 33, 1, 90000);
607 st->codec->codec_type = AVMEDIA_TYPE_DATA;
608 st->codec->codec_id = CODEC_ID_NONE;
609 st->need_parsing = AVSTREAM_PARSE_FULL;
611 pes->stream_type = stream_type;
613 av_log(pes->stream, AV_LOG_DEBUG,
614 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
615 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
617 st->codec->codec_tag = pes->stream_type;
619 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
620 if ((prog_reg_desc == AV_RL32("HDMV") ||
621 prog_reg_desc == AV_RL32("HDPR")) &&
622 st->codec->codec_id == CODEC_ID_NONE) {
623 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
624 if (pes->stream_type == 0x83) {
625 // HDMV TrueHD streams also contain an AC3 coded version of the
626 // audio track - add a second stream for this
628 // priv_data cannot be shared between streams
629 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
631 return AVERROR(ENOMEM);
632 memcpy(sub_pes, pes, sizeof(*sub_pes));
634 sub_st = avformat_new_stream(pes->stream, NULL);
637 return AVERROR(ENOMEM);
640 sub_st->id = pes->pid;
641 avpriv_set_pts_info(sub_st, 33, 1, 90000);
642 sub_st->priv_data = sub_pes;
643 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
644 sub_st->codec->codec_id = CODEC_ID_AC3;
645 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
646 sub_pes->sub_st = pes->sub_st = sub_st;
649 if (st->codec->codec_id == CODEC_ID_NONE)
650 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
651 if (st->codec->codec_id == CODEC_ID_NONE){
652 st->codec->codec_id = old_codec_id;
653 st->codec->codec_type= old_codec_type;
659 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
663 pkt->destruct = av_destruct_packet;
664 pkt->data = pes->buffer;
665 pkt->size = pes->data_index;
667 if(pes->total_size != MAX_PES_PAYLOAD &&
668 pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
669 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
670 pes->flags |= AV_PKT_FLAG_CORRUPT;
672 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
674 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
675 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
676 pkt->stream_index = pes->sub_st->index;
678 pkt->stream_index = pes->st->index;
681 /* store position of first TS packet of this PES packet */
682 pkt->pos = pes->ts_packet_pos;
683 pkt->flags = pes->flags;
685 /* reset pts values */
686 pes->pts = AV_NOPTS_VALUE;
687 pes->dts = AV_NOPTS_VALUE;
693 static uint64_t get_bits64(GetBitContext *gb, int bits)
697 if (get_bits_left(gb) < bits)
698 return AV_NOPTS_VALUE;
701 ret |= get_bits(gb, 17);
705 ret |= get_bits(gb, bits);
709 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
712 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
713 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
714 int dts_flag = -1, cts_flag = -1;
715 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
718 av_log(0,AV_LOG_WARNING, "empty SL header\n");
722 init_get_bits(&gb, buf, buf_size*8);
724 if (sl->use_au_start)
725 au_start_flag = get_bits1(&gb);
727 au_end_flag = get_bits1(&gb);
728 if (!sl->use_au_start && !sl->use_au_end)
729 au_start_flag = au_end_flag = 1;
731 ocr_flag = get_bits1(&gb);
733 idle_flag = get_bits1(&gb);
735 padding_flag = get_bits1(&gb);
737 padding_bits = get_bits(&gb, 3);
739 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
740 if (sl->packet_seq_num_len)
741 skip_bits_long(&gb, sl->packet_seq_num_len);
742 if (sl->degr_prior_len)
744 skip_bits(&gb, sl->degr_prior_len);
746 skip_bits_long(&gb, sl->ocr_len);
748 if (sl->use_rand_acc_pt)
750 if (sl->au_seq_num_len > 0)
751 skip_bits_long(&gb, sl->au_seq_num_len);
752 if (sl->use_timestamps) {
753 dts_flag = get_bits1(&gb);
754 cts_flag = get_bits1(&gb);
757 if (sl->inst_bitrate_len)
758 inst_bitrate_flag = get_bits1(&gb);
760 dts = get_bits64(&gb, sl->timestamp_len);
762 cts = get_bits64(&gb, sl->timestamp_len);
764 skip_bits_long(&gb, sl->au_len);
765 if (inst_bitrate_flag)
766 skip_bits_long(&gb, sl->inst_bitrate_len);
769 if (dts != AV_NOPTS_VALUE)
771 if (cts != AV_NOPTS_VALUE)
774 if (sl->timestamp_len && sl->timestamp_res)
775 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
777 return (get_bits_count(&gb) + 7) >> 3;
780 /* return non zero if a packet could be constructed */
781 static int mpegts_push_data(MpegTSFilter *filter,
782 const uint8_t *buf, int buf_size, int is_start,
785 PESContext *pes = filter->u.pes_filter.opaque;
786 MpegTSContext *ts = pes->ts;
794 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
795 new_pes_packet(pes, ts->pkt);
798 pes->state = MPEGTS_HEADER;
800 pes->ts_packet_pos = pos;
803 while (buf_size > 0) {
806 len = PES_START_SIZE - pes->data_index;
809 memcpy(pes->header + pes->data_index, p, len);
810 pes->data_index += len;
813 if (pes->data_index == PES_START_SIZE) {
814 /* we got all the PES or section header. We can now
816 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
817 pes->header[2] == 0x01) {
818 /* it must be an mpeg2 PES stream */
819 code = pes->header[3] | 0x100;
820 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
822 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
823 code == 0x1be) /* padding_stream */
826 /* stream not present in PMT */
828 pes->st = avformat_new_stream(ts->stream, NULL);
830 return AVERROR(ENOMEM);
831 pes->st->id = pes->pid;
832 mpegts_set_stream_info(pes->st, pes, 0, 0);
835 pes->total_size = AV_RB16(pes->header + 4);
836 /* NOTE: a zero total size means the PES size is
838 if (!pes->total_size)
839 pes->total_size = MAX_PES_PAYLOAD;
841 /* allocate pes buffer */
842 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
844 return AVERROR(ENOMEM);
846 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
847 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
848 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
849 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
850 pes->state = MPEGTS_PESHEADER;
851 if (pes->st->codec->codec_id == CODEC_ID_NONE && !pes->st->request_probe) {
852 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
853 pes->pid, pes->stream_type);
854 pes->st->request_probe= 1;
857 pes->state = MPEGTS_PAYLOAD;
861 /* otherwise, it should be a table */
864 pes->state = MPEGTS_SKIP;
869 /**********************************************/
870 /* PES packing parsing */
871 case MPEGTS_PESHEADER:
872 len = PES_HEADER_SIZE - pes->data_index;
877 memcpy(pes->header + pes->data_index, p, len);
878 pes->data_index += len;
881 if (pes->data_index == PES_HEADER_SIZE) {
882 pes->pes_header_size = pes->header[8] + 9;
883 pes->state = MPEGTS_PESHEADER_FILL;
886 case MPEGTS_PESHEADER_FILL:
887 len = pes->pes_header_size - pes->data_index;
892 memcpy(pes->header + pes->data_index, p, len);
893 pes->data_index += len;
896 if (pes->data_index == pes->pes_header_size) {
898 unsigned int flags, pes_ext, skip;
900 flags = pes->header[7];
902 pes->pts = AV_NOPTS_VALUE;
903 pes->dts = AV_NOPTS_VALUE;
904 if ((flags & 0xc0) == 0x80) {
905 pes->dts = pes->pts = ff_parse_pes_pts(r);
907 } else if ((flags & 0xc0) == 0xc0) {
908 pes->pts = ff_parse_pes_pts(r);
910 pes->dts = ff_parse_pes_pts(r);
913 pes->extended_stream_id = -1;
914 if (flags & 0x01) { /* PES extension */
916 /* Skip PES private data, program packet sequence counter and P-STD buffer */
917 skip = (pes_ext >> 4) & 0xb;
920 if ((pes_ext & 0x41) == 0x01 &&
921 (r + 2) <= (pes->header + pes->pes_header_size)) {
922 /* PES extension 2 */
923 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
924 pes->extended_stream_id = r[1];
928 /* we got the full header. We parse it and get the payload */
929 pes->state = MPEGTS_PAYLOAD;
931 if (pes->stream_type == 0x12) {
932 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
933 pes->pes_header_size += sl_header_bytes;
934 p += sl_header_bytes;
935 buf_size -= sl_header_bytes;
940 if (buf_size > 0 && pes->buffer) {
941 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
942 new_pes_packet(pes, ts->pkt);
943 pes->total_size = MAX_PES_PAYLOAD;
944 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
946 return AVERROR(ENOMEM);
948 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
949 // pes packet size is < ts size packet and pes data is padded with 0xff
950 // not sure if this is legal in ts but see issue #2392
951 buf_size = pes->total_size;
953 memcpy(pes->buffer+pes->data_index, p, buf_size);
954 pes->data_index += buf_size;
957 /* emit complete packets with known packet size
958 * decreases demuxer delay for infrequent packets like subtitles from
959 * a couple of seconds to milliseconds for properly muxed files.
960 * total_size is the number of bytes following pes_packet_length
961 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
962 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
963 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
965 new_pes_packet(pes, ts->pkt);
977 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
982 /* if no pid found, then add a pid context */
983 pes = av_mallocz(sizeof(PESContext));
987 pes->stream = ts->stream;
989 pes->pcr_pid = pcr_pid;
990 pes->state = MPEGTS_SKIP;
991 pes->pts = AV_NOPTS_VALUE;
992 pes->dts = AV_NOPTS_VALUE;
993 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1006 Mp4Descr *active_descr;
1008 int max_descr_count;
1010 } MP4DescrParseContext;
1012 static int init_MP4DescrParseContext(
1013 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
1014 unsigned size, Mp4Descr *descr, int max_descr_count)
1018 return AVERROR_INVALIDDATA;
1020 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
1021 NULL, NULL, NULL, NULL)) < 0)
1028 d->active_descr = NULL;
1029 d->max_descr_count = max_descr_count;
1034 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
1035 int64_t new_off = avio_tell(pb);
1036 (*len) -= new_off - *off;
1040 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1043 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1046 if (parse_mp4_descr(d, off, len, 0) < 0)
1048 update_offsets(&d->pb, &off, &len);
1053 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1055 avio_rb16(&d->pb); // ID
1061 update_offsets(&d->pb, &off, &len);
1062 return parse_mp4_descr_arr(d, off, len);
1065 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1070 id_flags = avio_rb16(&d->pb);
1071 if (!(id_flags & 0x0020)) { //URL_Flag
1072 update_offsets(&d->pb, &off, &len);
1073 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1079 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1082 if (d->descr_count >= d->max_descr_count)
1084 ff_mp4_parse_es_descr(&d->pb, &es_id);
1085 d->active_descr = d->descr + (d->descr_count++);
1087 d->active_descr->es_id = es_id;
1088 update_offsets(&d->pb, &off, &len);
1089 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1090 update_offsets(&d->pb, &off, &len);
1092 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1093 d->active_descr = NULL;
1097 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1099 Mp4Descr *descr = d->active_descr;
1102 d->active_descr->dec_config_descr = av_malloc(len);
1103 if (!descr->dec_config_descr)
1104 return AVERROR(ENOMEM);
1105 descr->dec_config_descr_len = len;
1106 avio_read(&d->pb, descr->dec_config_descr, len);
1110 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1112 Mp4Descr *descr = d->active_descr;
1117 predefined = avio_r8(&d->pb);
1120 int flags = avio_r8(&d->pb);
1121 descr->sl.use_au_start = !!(flags & 0x80);
1122 descr->sl.use_au_end = !!(flags & 0x40);
1123 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1124 descr->sl.use_padding = !!(flags & 0x08);
1125 descr->sl.use_timestamps = !!(flags & 0x04);
1126 descr->sl.use_idle = !!(flags & 0x02);
1127 descr->sl.timestamp_res = avio_rb32(&d->pb);
1129 descr->sl.timestamp_len = avio_r8(&d->pb);
1130 descr->sl.ocr_len = avio_r8(&d->pb);
1131 descr->sl.au_len = avio_r8(&d->pb);
1132 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1133 lengths = avio_rb16(&d->pb);
1134 descr->sl.degr_prior_len = lengths >> 12;
1135 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1136 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1138 av_log_missing_feature(d->s, "Predefined SLConfigDescriptor\n", 0);
1143 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1146 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1147 update_offsets(&d->pb, &off, &len);
1148 if (len < 0 || len1 > len || len1 <= 0) {
1149 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1153 if (d->level++ >= MAX_LEVEL) {
1154 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1158 if (target_tag && tag != target_tag) {
1159 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1165 parse_MP4IODescrTag(d, off, len1);
1168 parse_MP4ODescrTag(d, off, len1);
1171 parse_MP4ESDescrTag(d, off, len1);
1173 case MP4DecConfigDescrTag:
1174 parse_MP4DecConfigDescrTag(d, off, len1);
1177 parse_MP4SLDescrTag(d, off, len1);
1183 avio_seek(&d->pb, off + len1, SEEK_SET);
1187 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1188 Mp4Descr *descr, int *descr_count, int max_descr_count)
1190 MP4DescrParseContext d;
1191 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1194 parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1196 *descr_count = d.descr_count;
1200 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1201 Mp4Descr *descr, int *descr_count, int max_descr_count)
1203 MP4DescrParseContext d;
1204 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1207 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1209 *descr_count = d.descr_count;
1213 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1215 MpegTSContext *ts = filter->u.section_filter.opaque;
1217 const uint8_t *p, *p_end;
1219 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1220 int mp4_descr_count = 0;
1222 AVFormatContext *s = ts->stream;
1224 p_end = section + section_len - 4;
1226 if (parse_section_header(&h, &p, p_end) < 0)
1228 if (h.tid != M4OD_TID)
1231 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1233 for (pid = 0; pid < NB_PID_MAX; pid++) {
1236 for (i = 0; i < mp4_descr_count; i++) {
1239 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1241 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1242 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1245 pes = ts->pids[pid]->u.pes_filter.opaque;
1251 pes->sl = mp4_descr[i].sl;
1253 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1254 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1255 ff_mp4_read_dec_config_descr(s, st, &pb);
1256 if (st->codec->codec_id == CODEC_ID_AAC &&
1257 st->codec->extradata_size > 0)
1258 st->need_parsing = 0;
1259 if (st->codec->codec_id == CODEC_ID_H264 &&
1260 st->codec->extradata_size > 0)
1261 st->need_parsing = 0;
1263 if (st->codec->codec_id <= CODEC_ID_NONE) {
1264 } else if (st->codec->codec_id < CODEC_ID_FIRST_AUDIO) {
1265 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1266 } else if (st->codec->codec_id < CODEC_ID_FIRST_SUBTITLE) {
1267 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1268 } else if (st->codec->codec_id < CODEC_ID_FIRST_UNKNOWN) {
1269 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1273 for (i = 0; i < mp4_descr_count; i++)
1274 av_free(mp4_descr[i].dec_config_descr);
1277 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1278 const uint8_t **pp, const uint8_t *desc_list_end,
1279 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1282 const uint8_t *desc_end;
1283 int desc_len, desc_tag, desc_es_id;
1287 desc_tag = get8(pp, desc_list_end);
1290 desc_len = get8(pp, desc_list_end);
1293 desc_end = *pp + desc_len;
1294 if (desc_end > desc_list_end)
1297 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1299 if (st->codec->codec_id == CODEC_ID_NONE &&
1300 stream_type == STREAM_TYPE_PRIVATE_DATA)
1301 mpegts_find_stream_type(st, desc_tag, DESC_types);
1304 case 0x1E: /* SL descriptor */
1305 desc_es_id = get16(pp, desc_end);
1306 if (ts && ts->pids[pid])
1307 ts->pids[pid]->es_id = desc_es_id;
1308 for (i = 0; i < mp4_descr_count; i++)
1309 if (mp4_descr[i].dec_config_descr_len &&
1310 mp4_descr[i].es_id == desc_es_id) {
1312 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1313 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1314 ff_mp4_read_dec_config_descr(fc, st, &pb);
1315 if (st->codec->codec_id == CODEC_ID_AAC &&
1316 st->codec->extradata_size > 0)
1317 st->need_parsing = 0;
1318 if (st->codec->codec_id == CODEC_ID_MPEG4SYSTEMS)
1319 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1322 case 0x1F: /* FMC descriptor */
1323 get16(pp, desc_end);
1324 if (mp4_descr_count > 0 && (st->codec->codec_id == CODEC_ID_AAC_LATM || st->request_probe>0) &&
1325 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1327 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1328 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1329 ff_mp4_read_dec_config_descr(fc, st, &pb);
1330 if (st->codec->codec_id == CODEC_ID_AAC &&
1331 st->codec->extradata_size > 0){
1332 st->request_probe= st->need_parsing = 0;
1333 st->codec->codec_type= AVMEDIA_TYPE_AUDIO;
1337 case 0x56: /* DVB teletext descriptor */
1338 language[0] = get8(pp, desc_end);
1339 language[1] = get8(pp, desc_end);
1340 language[2] = get8(pp, desc_end);
1342 av_dict_set(&st->metadata, "language", language, 0);
1344 case 0x59: /* subtitling descriptor */
1345 language[0] = get8(pp, desc_end);
1346 language[1] = get8(pp, desc_end);
1347 language[2] = get8(pp, desc_end);
1349 /* hearing impaired subtitles detection */
1350 switch(get8(pp, desc_end)) {
1351 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1352 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1353 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1354 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1355 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1356 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1357 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1360 if (st->codec->extradata) {
1361 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1362 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1364 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1365 if (st->codec->extradata) {
1366 st->codec->extradata_size = 4;
1367 memcpy(st->codec->extradata, *pp, 4);
1371 av_dict_set(&st->metadata, "language", language, 0);
1373 case 0x0a: /* ISO 639 language descriptor */
1374 for (i = 0; i + 4 <= desc_len; i += 4) {
1375 language[i + 0] = get8(pp, desc_end);
1376 language[i + 1] = get8(pp, desc_end);
1377 language[i + 2] = get8(pp, desc_end);
1378 language[i + 3] = ',';
1379 switch (get8(pp, desc_end)) {
1380 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1381 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1382 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1386 language[i - 1] = 0;
1387 av_dict_set(&st->metadata, "language", language, 0);
1390 case 0x05: /* registration descriptor */
1391 st->codec->codec_tag = bytestream_get_le32(pp);
1392 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1393 if (st->codec->codec_id == CODEC_ID_NONE &&
1394 stream_type == STREAM_TYPE_PRIVATE_DATA)
1395 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1397 case 0x52: /* stream identifier descriptor */
1398 st->stream_identifier = 1 + get8(pp, desc_end);
1407 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1409 MpegTSContext *ts = filter->u.section_filter.opaque;
1410 SectionHeader h1, *h = &h1;
1413 const uint8_t *p, *p_end, *desc_list_end;
1414 int program_info_length, pcr_pid, pid, stream_type;
1416 uint32_t prog_reg_desc = 0; /* registration descriptor */
1418 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1419 int mp4_descr_count = 0;
1422 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1423 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1425 p_end = section + section_len - 4;
1427 if (parse_section_header(h, &p, p_end) < 0)
1430 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1431 h->id, h->sec_num, h->last_sec_num);
1433 if (h->tid != PMT_TID)
1436 clear_program(ts, h->id);
1437 pcr_pid = get16(&p, p_end) & 0x1fff;
1440 add_pid_to_pmt(ts, h->id, pcr_pid);
1441 set_pcr_pid(ts->stream, h->id, pcr_pid);
1443 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1445 program_info_length = get16(&p, p_end) & 0xfff;
1446 if (program_info_length < 0)
1448 while(program_info_length >= 2) {
1450 tag = get8(&p, p_end);
1451 len = get8(&p, p_end);
1453 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1455 if(len > program_info_length - 2)
1456 //something else is broken, exit the program_descriptors_loop
1458 program_info_length -= len + 2;
1459 if (tag == 0x1d) { // IOD descriptor
1460 get8(&p, p_end); // scope
1461 get8(&p, p_end); // label
1463 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1464 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1465 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1466 prog_reg_desc = bytestream_get_le32(&p);
1471 p += program_info_length;
1475 // stop parsing after pmt, we found header
1476 if (!ts->stream->nb_streams)
1482 stream_type = get8(&p, p_end);
1483 if (stream_type < 0)
1485 pid = get16(&p, p_end) & 0x1fff;
1489 /* now create stream */
1490 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1491 pes = ts->pids[pid]->u.pes_filter.opaque;
1493 pes->st = avformat_new_stream(pes->stream, NULL);
1494 pes->st->id = pes->pid;
1497 } else if (stream_type != 0x13) {
1498 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1499 pes = add_pes_stream(ts, pid, pcr_pid);
1501 st = avformat_new_stream(pes->stream, NULL);
1505 int idx = ff_find_stream_index(ts->stream, pid);
1507 st = ts->stream->streams[idx];
1509 st = avformat_new_stream(ts->stream, NULL);
1511 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1518 if (pes && !pes->stream_type)
1519 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1521 add_pid_to_pmt(ts, h->id, pid);
1523 ff_program_add_stream_index(ts->stream, h->id, st->index);
1525 desc_list_len = get16(&p, p_end) & 0xfff;
1526 if (desc_list_len < 0)
1528 desc_list_end = p + desc_list_len;
1529 if (desc_list_end > p_end)
1532 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1533 mp4_descr, mp4_descr_count, pid, ts) < 0)
1536 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1537 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1538 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1545 for (i = 0; i < mp4_descr_count; i++)
1546 av_free(mp4_descr[i].dec_config_descr);
1549 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1551 MpegTSContext *ts = filter->u.section_filter.opaque;
1552 SectionHeader h1, *h = &h1;
1553 const uint8_t *p, *p_end;
1557 av_dlog(ts->stream, "PAT:\n");
1558 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1560 p_end = section + section_len - 4;
1562 if (parse_section_header(h, &p, p_end) < 0)
1564 if (h->tid != PAT_TID)
1567 ts->stream->ts_id = h->id;
1571 sid = get16(&p, p_end);
1574 pmt_pid = get16(&p, p_end) & 0x1fff;
1578 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1580 if (sid == 0x0000) {
1583 program = av_new_program(ts->stream, sid);
1584 program->program_num = sid;
1585 program->pmt_pid = pmt_pid;
1586 if (ts->pids[pmt_pid])
1587 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1588 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1589 add_pat_entry(ts, sid);
1590 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1591 add_pid_to_pmt(ts, sid, pmt_pid);
1596 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1598 MpegTSContext *ts = filter->u.section_filter.opaque;
1599 SectionHeader h1, *h = &h1;
1600 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1601 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1602 char *name, *provider_name;
1604 av_dlog(ts->stream, "SDT:\n");
1605 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1607 p_end = section + section_len - 4;
1609 if (parse_section_header(h, &p, p_end) < 0)
1611 if (h->tid != SDT_TID)
1613 onid = get16(&p, p_end);
1616 val = get8(&p, p_end);
1620 sid = get16(&p, p_end);
1623 val = get8(&p, p_end);
1626 desc_list_len = get16(&p, p_end) & 0xfff;
1627 if (desc_list_len < 0)
1629 desc_list_end = p + desc_list_len;
1630 if (desc_list_end > p_end)
1633 desc_tag = get8(&p, desc_list_end);
1636 desc_len = get8(&p, desc_list_end);
1637 desc_end = p + desc_len;
1638 if (desc_end > desc_list_end)
1641 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1642 desc_tag, desc_len);
1646 service_type = get8(&p, p_end);
1647 if (service_type < 0)
1649 provider_name = getstr8(&p, p_end);
1652 name = getstr8(&p, p_end);
1654 AVProgram *program = av_new_program(ts->stream, sid);
1656 av_dict_set(&program->metadata, "service_name", name, 0);
1657 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1661 av_free(provider_name);
1672 /* handle one TS packet */
1673 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1675 AVFormatContext *s = ts->stream;
1677 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1678 has_adaptation, has_payload;
1679 const uint8_t *p, *p_end;
1682 pid = AV_RB16(packet + 1) & 0x1fff;
1683 if(pid && discard_pid(ts, pid))
1685 is_start = packet[1] & 0x40;
1686 tss = ts->pids[pid];
1687 if (ts->auto_guess && tss == NULL && is_start) {
1688 add_pes_stream(ts, pid, -1);
1689 tss = ts->pids[pid];
1694 afc = (packet[3] >> 4) & 3;
1695 if (afc == 0) /* reserved value */
1697 has_adaptation = afc & 2;
1698 has_payload = afc & 1;
1699 is_discontinuity = has_adaptation
1700 && packet[4] != 0 /* with length > 0 */
1701 && (packet[5] & 0x80); /* and discontinuity indicated */
1703 /* continuity check (currently not used) */
1704 cc = (packet[3] & 0xf);
1705 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1706 cc_ok = pid == 0x1FFF // null packet PID
1709 || expected_cc == cc;
1713 av_log(ts->stream, AV_LOG_DEBUG,
1714 "Continuity check failed for pid %d expected %d got %d\n",
1715 pid, expected_cc, cc);
1716 if(tss->type == MPEGTS_PES) {
1717 PESContext *pc = tss->u.pes_filter.opaque;
1718 pc->flags |= AV_PKT_FLAG_CORRUPT;
1725 if (has_adaptation) {
1726 /* skip adaptation field */
1729 /* if past the end of packet, ignore */
1730 p_end = packet + TS_PACKET_SIZE;
1734 pos = avio_tell(ts->stream->pb);
1735 ts->pos47= pos % ts->raw_packet_size;
1737 if (tss->type == MPEGTS_SECTION) {
1739 /* pointer field present */
1741 if (p + len > p_end)
1744 /* write remaining section bytes */
1745 write_section_data(s, tss,
1747 /* check whether filter has been closed */
1753 write_section_data(s, tss,
1758 write_section_data(s, tss,
1764 // Note: The position here points actually behind the current packet.
1765 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1766 pos - ts->raw_packet_size)) < 0)
1773 /* XXX: try to find a better synchro over several packets (use
1774 get_packet_size() ?) */
1775 static int mpegts_resync(AVFormatContext *s)
1777 AVIOContext *pb = s->pb;
1780 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1785 avio_seek(pb, -1, SEEK_CUR);
1789 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1794 /* return -1 if error or EOF. Return 0 if OK. */
1795 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1797 AVIOContext *pb = s->pb;
1801 len = avio_read(pb, buf, TS_PACKET_SIZE);
1802 if (len != TS_PACKET_SIZE)
1803 return len < 0 ? len : AVERROR_EOF;
1804 /* check packet sync byte */
1805 if (buf[0] != 0x47) {
1806 /* find a new packet start */
1807 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1808 if (mpegts_resync(s) < 0)
1809 return AVERROR(EAGAIN);
1813 skip = raw_packet_size - TS_PACKET_SIZE;
1815 avio_skip(pb, skip);
1822 static int handle_packets(MpegTSContext *ts, int nb_packets)
1824 AVFormatContext *s = ts->stream;
1825 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
1826 int packet_num, ret = 0;
1828 if (avio_tell(s->pb) != ts->last_pos) {
1830 av_dlog(ts->stream, "Skipping after seek\n");
1831 /* seek detected, flush pes buffer */
1832 for (i = 0; i < NB_PID_MAX; i++) {
1834 if (ts->pids[i]->type == MPEGTS_PES) {
1835 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1836 av_freep(&pes->buffer);
1837 pes->data_index = 0;
1838 pes->state = MPEGTS_SKIP; /* skip until pes header */
1840 ts->pids[i]->last_cc = -1;
1849 if (nb_packets != 0 && packet_num >= nb_packets ||
1850 ts->stop_parse > 1) {
1851 ret = AVERROR(EAGAIN);
1854 if (ts->stop_parse > 0)
1857 ret = read_packet(s, packet, ts->raw_packet_size);
1860 ret = handle_packet(ts, packet);
1864 ts->last_pos = avio_tell(s->pb);
1868 static int mpegts_probe(AVProbeData *p)
1871 const int size= p->buf_size;
1872 int score, fec_score, dvhs_score;
1873 int check_count= size / TS_FEC_PACKET_SIZE;
1874 #define CHECK_COUNT 10
1876 if (check_count < CHECK_COUNT)
1879 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1880 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1881 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1882 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1884 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1885 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1886 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1887 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1890 /* only use the extension for safer guess */
1891 if (av_match_ext(p->filename, "ts"))
1892 return AVPROBE_SCORE_MAX;
1898 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1899 (-1) if not available */
1900 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1901 const uint8_t *packet)
1903 int afc, len, flags;
1907 afc = (packet[3] >> 4) & 3;
1917 if (!(flags & 0x10))
1922 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1923 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1927 static int mpegts_read_header(AVFormatContext *s)
1929 MpegTSContext *ts = s->priv_data;
1930 AVIOContext *pb = s->pb;
1931 uint8_t buf[8*1024];
1935 /* read the first 8192 bytes to get packet size */
1936 pos = avio_tell(pb);
1937 len = avio_read(pb, buf, sizeof(buf));
1938 if (len != sizeof(buf))
1940 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1941 if (ts->raw_packet_size <= 0) {
1942 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1943 ts->raw_packet_size = TS_PACKET_SIZE;
1948 if (s->iformat == &ff_mpegts_demuxer) {
1951 /* first do a scan to get all the services */
1952 /* NOTE: We attempt to seek on non-seekable files as well, as the
1953 * probe buffer usually is big enough. Only warn if the seek failed
1954 * on files where the seek should work. */
1955 if (avio_seek(pb, pos, SEEK_SET) < 0)
1956 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
1958 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1960 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1962 handle_packets(ts, s->probesize / ts->raw_packet_size);
1963 /* if could not find service, enable auto_guess */
1967 av_dlog(ts->stream, "tuning done\n");
1969 s->ctx_flags |= AVFMTCTX_NOHEADER;
1972 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1973 int64_t pcrs[2], pcr_h;
1974 int packet_count[2];
1975 uint8_t packet[TS_PACKET_SIZE];
1977 /* only read packets */
1979 st = avformat_new_stream(s, NULL);
1982 avpriv_set_pts_info(st, 60, 1, 27000000);
1983 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1984 st->codec->codec_id = CODEC_ID_MPEG2TS;
1986 /* we iterate until we find two PCRs to estimate the bitrate */
1991 ret = read_packet(s, packet, ts->raw_packet_size);
1994 pid = AV_RB16(packet + 1) & 0x1fff;
1995 if ((pcr_pid == -1 || pcr_pid == pid) &&
1996 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1998 packet_count[nb_pcrs] = nb_packets;
1999 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2007 /* NOTE1: the bitrate is computed without the FEC */
2008 /* NOTE2: it is only the bitrate of the start of the stream */
2009 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2010 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2011 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
2012 st->codec->bit_rate = s->bit_rate;
2013 st->start_time = ts->cur_pcr;
2014 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2015 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2018 avio_seek(pb, pos, SEEK_SET);
2024 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2026 static int mpegts_raw_read_packet(AVFormatContext *s,
2029 MpegTSContext *ts = s->priv_data;
2031 int64_t pcr_h, next_pcr_h, pos;
2032 int pcr_l, next_pcr_l;
2033 uint8_t pcr_buf[12];
2035 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2036 return AVERROR(ENOMEM);
2037 pkt->pos= avio_tell(s->pb);
2038 ret = read_packet(s, pkt->data, ts->raw_packet_size);
2040 av_free_packet(pkt);
2043 if (ts->mpeg2ts_compute_pcr) {
2044 /* compute exact PCR for each packet */
2045 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2046 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2047 pos = avio_tell(s->pb);
2048 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
2049 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2050 avio_read(s->pb, pcr_buf, 12);
2051 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2052 /* XXX: not precise enough */
2053 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2058 avio_seek(s->pb, pos, SEEK_SET);
2059 /* no next PCR found: we use previous increment */
2060 ts->cur_pcr = pcr_h * 300 + pcr_l;
2062 pkt->pts = ts->cur_pcr;
2063 pkt->duration = ts->pcr_incr;
2064 ts->cur_pcr += ts->pcr_incr;
2066 pkt->stream_index = 0;
2070 static int mpegts_read_packet(AVFormatContext *s,
2073 MpegTSContext *ts = s->priv_data;
2077 ret = handle_packets(ts, 0);
2079 /* flush pes data left */
2080 for (i = 0; i < NB_PID_MAX; i++) {
2081 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2082 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2083 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2084 new_pes_packet(pes, pkt);
2085 pes->state = MPEGTS_SKIP;
2096 static int mpegts_read_close(AVFormatContext *s)
2098 MpegTSContext *ts = s->priv_data;
2103 for(i=0;i<NB_PID_MAX;i++)
2104 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2109 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2110 int64_t *ppos, int64_t pos_limit)
2112 MpegTSContext *ts = s->priv_data;
2113 int64_t pos, timestamp;
2114 uint8_t buf[TS_PACKET_SIZE];
2115 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2116 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2117 while(pos < pos_limit) {
2118 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2119 return AV_NOPTS_VALUE;
2120 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2121 return AV_NOPTS_VALUE;
2122 if (buf[0] != 0x47) {
2123 if (mpegts_resync(s) < 0)
2124 return AV_NOPTS_VALUE;
2125 pos = avio_tell(s->pb);
2128 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2129 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2133 pos += ts->raw_packet_size;
2136 return AV_NOPTS_VALUE;
2139 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2140 int64_t *ppos, int64_t pos_limit)
2142 MpegTSContext *ts = s->priv_data;
2144 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2145 ff_read_frame_flush(s);
2146 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2147 return AV_NOPTS_VALUE;
2148 while(pos < pos_limit) {
2151 av_init_packet(&pkt);
2152 ret= av_read_frame(s, &pkt);
2154 return AV_NOPTS_VALUE;
2155 av_free_packet(&pkt);
2156 if(pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0){
2157 ff_reduce_index(s, pkt.stream_index);
2158 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2159 if(pkt.stream_index == stream_index){
2167 return AV_NOPTS_VALUE;
2170 #ifdef USE_SYNCPOINT_SEARCH
2172 static int read_seek2(AVFormatContext *s,
2181 int64_t ts_ret, ts_adj;
2182 int stream_index_gen_search;
2184 AVParserState *backup;
2186 backup = ff_store_parser_state(s);
2188 // detect direction of seeking for search purposes
2189 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
2190 AVSEEK_FLAG_BACKWARD : 0;
2192 if (flags & AVSEEK_FLAG_BYTE) {
2193 // use position directly, we will search starting from it
2196 // search for some position with good timestamp match
2197 if (stream_index < 0) {
2198 stream_index_gen_search = av_find_default_stream_index(s);
2199 if (stream_index_gen_search < 0) {
2200 ff_restore_parser_state(s, backup);
2204 st = s->streams[stream_index_gen_search];
2205 // timestamp for default must be expressed in AV_TIME_BASE units
2206 ts_adj = av_rescale(target_ts,
2208 AV_TIME_BASE * (int64_t)st->time_base.num);
2211 stream_index_gen_search = stream_index;
2213 pos = ff_gen_search(s, stream_index_gen_search, ts_adj,
2217 flags, &ts_ret, mpegts_get_pcr);
2219 ff_restore_parser_state(s, backup);
2224 // search for actual matching keyframe/starting position for all streams
2225 if (ff_gen_syncpoint_search(s, stream_index, pos,
2226 min_ts, target_ts, max_ts,
2228 ff_restore_parser_state(s, backup);
2232 ff_free_parser_state(s, backup);
2236 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
2239 if (flags & AVSEEK_FLAG_BACKWARD) {
2240 flags &= ~AVSEEK_FLAG_BACKWARD;
2241 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
2243 // for compatibility reasons, seek to the best-fitting timestamp
2244 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
2246 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
2248 // for compatibility reasons, seek to the best-fitting timestamp
2249 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
2256 /**************************************************************/
2257 /* parsing functions - called from other demuxers such as RTP */
2259 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2263 ts = av_mallocz(sizeof(MpegTSContext));
2266 /* no stream case, currently used by RTP */
2267 ts->raw_packet_size = TS_PACKET_SIZE;
2270 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2271 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2276 /* return the consumed length if a packet was output, or -1 if no
2278 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2279 const uint8_t *buf, int len)
2287 if (len < TS_PACKET_SIZE)
2289 if (buf[0] != 0x47) {
2293 handle_packet(ts, buf);
2294 buf += TS_PACKET_SIZE;
2295 len -= TS_PACKET_SIZE;
2296 if (ts->stop_parse == 1)
2303 void ff_mpegts_parse_close(MpegTSContext *ts)
2307 for(i=0;i<NB_PID_MAX;i++)
2308 av_free(ts->pids[i]);
2312 AVInputFormat ff_mpegts_demuxer = {
2314 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
2315 .priv_data_size = sizeof(MpegTSContext),
2316 .read_probe = mpegts_probe,
2317 .read_header = mpegts_read_header,
2318 .read_packet = mpegts_read_packet,
2319 .read_close = mpegts_read_close,
2320 .read_timestamp = mpegts_get_dts,
2321 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
2322 #ifdef USE_SYNCPOINT_SEARCH
2323 .read_seek2 = read_seek2,
2327 AVInputFormat ff_mpegtsraw_demuxer = {
2328 .name = "mpegtsraw",
2329 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
2330 .priv_data_size = sizeof(MpegTSContext),
2331 .read_header = mpegts_read_header,
2332 .read_packet = mpegts_raw_read_packet,
2333 .read_close = mpegts_read_close,
2334 .read_timestamp = mpegts_get_dts,
2335 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
2336 #ifdef USE_SYNCPOINT_SEARCH
2337 .read_seek2 = read_seek2,
2339 .priv_class = &mpegtsraw_class,