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/crc.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/log.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/avassert.h"
29 #include "libavcodec/bytestream.h"
30 #include "libavcodec/get_bits.h"
34 #include "avio_internal.h"
39 /* maximum size in which we look for synchronisation if
40 synchronisation is lost */
41 #define MAX_RESYNC_SIZE 65536
43 #define MAX_PES_PAYLOAD 200*1024
45 #define MAX_MP4_DESCR_COUNT 16
47 enum MpegTSFilterType {
52 typedef struct MpegTSFilter MpegTSFilter;
54 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
56 typedef struct MpegTSPESFilter {
61 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
63 typedef void SetServiceCallback(void *opaque, int ret);
65 typedef struct MpegTSSectionFilter {
69 unsigned int check_crc:1;
70 unsigned int end_of_section_reached:1;
71 SectionCallback *section_cb;
73 } MpegTSSectionFilter;
78 int last_cc; /* last cc code (-1 if first packet) */
79 enum MpegTSFilterType type;
81 MpegTSPESFilter pes_filter;
82 MpegTSSectionFilter section_filter;
86 #define MAX_PIDS_PER_PROGRAM 64
88 unsigned int id; //program id/service id
90 unsigned int pids[MAX_PIDS_PER_PROGRAM];
93 struct MpegTSContext {
96 AVFormatContext *stream;
97 /** raw packet size, including FEC if present */
102 /** if true, all pids are analyzed to find streams */
105 /** compute exact PCR for each transport stream packet */
106 int mpeg2ts_compute_pcr;
108 int64_t cur_pcr; /**< used to estimate the exact PCR */
109 int pcr_incr; /**< used to estimate the exact PCR */
111 /* data needed to handle file based ts */
112 /** stop parsing loop */
114 /** packet containing Audio/Video data */
116 /** to detect seek */
119 /******************************************/
120 /* private mpegts data */
122 /** structure to keep track of Program->pids mapping */
127 /** filters for various streams specified by PMT + for the PAT and PMT */
128 MpegTSFilter *pids[NB_PID_MAX];
131 static const AVOption options[] = {
132 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
133 {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
137 static const AVClass mpegtsraw_class = {
138 .class_name = "mpegtsraw demuxer",
139 .item_name = av_default_item_name,
141 .version = LIBAVUTIL_VERSION_INT,
144 /* TS stream handling */
149 MPEGTS_PESHEADER_FILL,
154 /* enough for PES header + length */
155 #define PES_START_SIZE 6
156 #define PES_HEADER_SIZE 9
157 #define MAX_PES_HEADER_SIZE (9 + 255)
159 typedef struct PESContext {
161 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
164 AVFormatContext *stream;
166 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
167 enum MpegTSState state;
168 /* used to get the format */
170 int flags; /**< copied to the AVPacket flags */
173 int extended_stream_id;
175 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
176 uint8_t header[MAX_PES_HEADER_SIZE];
181 extern AVInputFormat ff_mpegts_demuxer;
183 static void clear_program(MpegTSContext *ts, unsigned int programid)
187 for(i=0; i<ts->nb_prg; i++)
188 if(ts->prg[i].id == programid)
189 ts->prg[i].nb_pids = 0;
192 static void clear_programs(MpegTSContext *ts)
198 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
201 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
205 p = &ts->prg[ts->nb_prg];
211 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
214 struct Program *p = NULL;
215 for(i=0; i<ts->nb_prg; i++) {
216 if(ts->prg[i].id == programid) {
224 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
226 p->pids[p->nb_pids++] = pid;
229 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
232 for(i=0; i<s->nb_programs; i++) {
233 if(s->programs[i]->id == programid) {
234 s->programs[i]->pcr_pid = pid;
241 * @brief discard_pid() decides if the pid is to be discarded according
242 * to caller's programs selection
243 * @param ts : - TS context
245 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
248 static int discard_pid(MpegTSContext *ts, unsigned int pid)
251 int used = 0, discarded = 0;
253 for(i=0; i<ts->nb_prg; i++) {
255 for(j=0; j<p->nb_pids; j++) {
256 if(p->pids[j] != pid)
258 //is program with id p->id set to be discarded?
259 for(k=0; k<ts->stream->nb_programs; k++) {
260 if(ts->stream->programs[k]->id == p->id) {
261 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
270 return !used && discarded;
274 * Assemble PES packets out of TS packets, and then call the "section_cb"
275 * function when they are complete.
277 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
278 const uint8_t *buf, int buf_size, int is_start)
280 MpegTSSectionFilter *tss = &tss1->u.section_filter;
284 memcpy(tss->section_buf, buf, buf_size);
285 tss->section_index = buf_size;
286 tss->section_h_size = -1;
287 tss->end_of_section_reached = 0;
289 if (tss->end_of_section_reached)
291 len = 4096 - tss->section_index;
294 memcpy(tss->section_buf + tss->section_index, buf, len);
295 tss->section_index += len;
298 /* compute section length if possible */
299 if (tss->section_h_size == -1 && tss->section_index >= 3) {
300 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
303 tss->section_h_size = len;
306 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
307 tss->end_of_section_reached = 1;
308 if (!tss->check_crc ||
309 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
310 tss->section_buf, tss->section_h_size) == 0)
311 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
315 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
316 SectionCallback *section_cb, void *opaque,
320 MpegTSFilter *filter;
321 MpegTSSectionFilter *sec;
323 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
325 if (pid >= NB_PID_MAX || ts->pids[pid])
327 filter = av_mallocz(sizeof(MpegTSFilter));
330 ts->pids[pid] = filter;
331 filter->type = MPEGTS_SECTION;
334 filter->last_cc = -1;
335 sec = &filter->u.section_filter;
336 sec->section_cb = section_cb;
337 sec->opaque = opaque;
338 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
339 sec->check_crc = check_crc;
340 if (!sec->section_buf) {
347 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
351 MpegTSFilter *filter;
352 MpegTSPESFilter *pes;
354 if (pid >= NB_PID_MAX || ts->pids[pid])
356 filter = av_mallocz(sizeof(MpegTSFilter));
359 ts->pids[pid] = filter;
360 filter->type = MPEGTS_PES;
363 filter->last_cc = -1;
364 pes = &filter->u.pes_filter;
365 pes->pes_cb = pes_cb;
366 pes->opaque = opaque;
370 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
375 if (filter->type == MPEGTS_SECTION)
376 av_freep(&filter->u.section_filter.section_buf);
377 else if (filter->type == MPEGTS_PES) {
378 PESContext *pes = filter->u.pes_filter.opaque;
379 av_freep(&pes->buffer);
380 /* referenced private data will be freed later in
381 * avformat_close_input */
382 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
383 av_freep(&filter->u.pes_filter.opaque);
388 ts->pids[pid] = NULL;
391 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
392 int stat[TS_MAX_PACKET_SIZE];
397 memset(stat, 0, packet_size*sizeof(int));
399 for(x=i=0; i<size-3; i++){
400 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){
402 if(stat[x] > best_score){
409 if(x == packet_size) x= 0;
415 /* autodetect fec presence. Must have at least 1024 bytes */
416 static int get_packet_size(const uint8_t *buf, int size)
418 int score, fec_score, dvhs_score;
420 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
423 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
424 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
425 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
426 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
428 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
429 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
430 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
434 typedef struct SectionHeader {
439 uint8_t last_sec_num;
442 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
455 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
461 if ((p + 1) >= p_end)
469 /* read and allocate a DVB string preceded by its length */
470 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
477 len = get8(&p, p_end);
480 if ((p + len) > p_end)
482 str = av_malloc(len + 1);
492 static int parse_section_header(SectionHeader *h,
493 const uint8_t **pp, const uint8_t *p_end)
497 val = get8(pp, p_end);
502 val = get16(pp, p_end);
506 val = get8(pp, p_end);
509 h->version = (val >> 1) & 0x1f;
510 val = get8(pp, p_end);
514 val = get8(pp, p_end);
517 h->last_sec_num = val;
522 uint32_t stream_type;
523 enum AVMediaType codec_type;
524 enum AVCodecID codec_id;
527 static const StreamType ISO_types[] = {
528 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
529 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
530 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
531 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
532 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
533 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
534 /* Makito encoder sets stream type 0x11 for AAC,
535 * so auto-detect LOAS/LATM instead of hardcoding it. */
536 // { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
537 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
538 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
539 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
543 static const StreamType HDMV_types[] = {
544 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
545 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
546 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
547 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
548 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
549 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
550 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
551 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
552 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
553 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
558 static const StreamType MISC_types[] = {
559 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
560 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
564 static const StreamType REGD_types[] = {
565 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
566 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
567 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
568 { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
569 { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
570 { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
571 { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
575 /* descriptor present */
576 static const StreamType DESC_types[] = {
577 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
578 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
579 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
580 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
581 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
585 static void mpegts_find_stream_type(AVStream *st,
586 uint32_t stream_type, const StreamType *types)
588 for (; types->stream_type; types++) {
589 if (stream_type == types->stream_type) {
590 st->codec->codec_type = types->codec_type;
591 st->codec->codec_id = types->codec_id;
592 st->request_probe = 0;
598 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
599 uint32_t stream_type, uint32_t prog_reg_desc)
601 int old_codec_type= st->codec->codec_type;
602 int old_codec_id = st->codec->codec_id;
603 avpriv_set_pts_info(st, 33, 1, 90000);
605 st->codec->codec_type = AVMEDIA_TYPE_DATA;
606 st->codec->codec_id = AV_CODEC_ID_NONE;
607 st->need_parsing = AVSTREAM_PARSE_FULL;
609 pes->stream_type = stream_type;
611 av_log(pes->stream, AV_LOG_DEBUG,
612 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
613 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
615 st->codec->codec_tag = pes->stream_type;
617 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
618 if ((prog_reg_desc == AV_RL32("HDMV") ||
619 prog_reg_desc == AV_RL32("HDPR")) &&
620 st->codec->codec_id == AV_CODEC_ID_NONE) {
621 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
622 if (pes->stream_type == 0x83) {
623 // HDMV TrueHD streams also contain an AC3 coded version of the
624 // audio track - add a second stream for this
626 // priv_data cannot be shared between streams
627 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
629 return AVERROR(ENOMEM);
630 memcpy(sub_pes, pes, sizeof(*sub_pes));
632 sub_st = avformat_new_stream(pes->stream, NULL);
635 return AVERROR(ENOMEM);
638 sub_st->id = pes->pid;
639 avpriv_set_pts_info(sub_st, 33, 1, 90000);
640 sub_st->priv_data = sub_pes;
641 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
642 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
643 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
644 sub_pes->sub_st = pes->sub_st = sub_st;
647 if (st->codec->codec_id == AV_CODEC_ID_NONE)
648 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
649 if (st->codec->codec_id == AV_CODEC_ID_NONE){
650 st->codec->codec_id = old_codec_id;
651 st->codec->codec_type= old_codec_type;
657 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
661 pkt->destruct = av_destruct_packet;
662 pkt->data = pes->buffer;
663 pkt->size = pes->data_index;
665 if(pes->total_size != MAX_PES_PAYLOAD &&
666 pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
667 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
668 pes->flags |= AV_PKT_FLAG_CORRUPT;
670 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
672 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
673 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
674 pkt->stream_index = pes->sub_st->index;
676 pkt->stream_index = pes->st->index;
679 /* store position of first TS packet of this PES packet */
680 pkt->pos = pes->ts_packet_pos;
681 pkt->flags = pes->flags;
683 /* reset pts values */
684 pes->pts = AV_NOPTS_VALUE;
685 pes->dts = AV_NOPTS_VALUE;
691 static uint64_t get_bits64(GetBitContext *gb, int bits)
695 if (get_bits_left(gb) < bits)
696 return AV_NOPTS_VALUE;
699 ret |= get_bits(gb, 17);
703 ret |= get_bits(gb, bits);
707 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
710 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
711 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
712 int dts_flag = -1, cts_flag = -1;
713 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
715 init_get_bits(&gb, buf, buf_size*8);
717 if (sl->use_au_start)
718 au_start_flag = get_bits1(&gb);
720 au_end_flag = get_bits1(&gb);
721 if (!sl->use_au_start && !sl->use_au_end)
722 au_start_flag = au_end_flag = 1;
724 ocr_flag = get_bits1(&gb);
726 idle_flag = get_bits1(&gb);
728 padding_flag = get_bits1(&gb);
730 padding_bits = get_bits(&gb, 3);
732 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
733 if (sl->packet_seq_num_len)
734 skip_bits_long(&gb, sl->packet_seq_num_len);
735 if (sl->degr_prior_len)
737 skip_bits(&gb, sl->degr_prior_len);
739 skip_bits_long(&gb, sl->ocr_len);
741 if (sl->use_rand_acc_pt)
743 if (sl->au_seq_num_len > 0)
744 skip_bits_long(&gb, sl->au_seq_num_len);
745 if (sl->use_timestamps) {
746 dts_flag = get_bits1(&gb);
747 cts_flag = get_bits1(&gb);
750 if (sl->inst_bitrate_len)
751 inst_bitrate_flag = get_bits1(&gb);
753 dts = get_bits64(&gb, sl->timestamp_len);
755 cts = get_bits64(&gb, sl->timestamp_len);
757 skip_bits_long(&gb, sl->au_len);
758 if (inst_bitrate_flag)
759 skip_bits_long(&gb, sl->inst_bitrate_len);
762 if (dts != AV_NOPTS_VALUE)
764 if (cts != AV_NOPTS_VALUE)
767 if (sl->timestamp_len && sl->timestamp_res)
768 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
770 return (get_bits_count(&gb) + 7) >> 3;
773 /* return non zero if a packet could be constructed */
774 static int mpegts_push_data(MpegTSFilter *filter,
775 const uint8_t *buf, int buf_size, int is_start,
778 PESContext *pes = filter->u.pes_filter.opaque;
779 MpegTSContext *ts = pes->ts;
787 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
788 new_pes_packet(pes, ts->pkt);
791 pes->state = MPEGTS_HEADER;
793 pes->ts_packet_pos = pos;
796 while (buf_size > 0) {
799 len = PES_START_SIZE - pes->data_index;
802 memcpy(pes->header + pes->data_index, p, len);
803 pes->data_index += len;
806 if (pes->data_index == PES_START_SIZE) {
807 /* we got all the PES or section header. We can now
809 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
810 pes->header[2] == 0x01) {
811 /* it must be an mpeg2 PES stream */
812 code = pes->header[3] | 0x100;
813 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
815 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
816 (!pes->sub_st || pes->sub_st->discard == AVDISCARD_ALL)) ||
817 code == 0x1be) /* padding_stream */
820 /* stream not present in PMT */
822 pes->st = avformat_new_stream(ts->stream, NULL);
824 return AVERROR(ENOMEM);
825 pes->st->id = pes->pid;
826 mpegts_set_stream_info(pes->st, pes, 0, 0);
829 pes->total_size = AV_RB16(pes->header + 4);
830 /* NOTE: a zero total size means the PES size is
832 if (!pes->total_size)
833 pes->total_size = MAX_PES_PAYLOAD;
835 /* allocate pes buffer */
836 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
838 return AVERROR(ENOMEM);
840 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
841 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
842 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
843 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
844 pes->state = MPEGTS_PESHEADER;
845 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
846 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
847 pes->pid, pes->stream_type);
848 pes->st->request_probe= 1;
851 pes->state = MPEGTS_PAYLOAD;
855 /* otherwise, it should be a table */
858 pes->state = MPEGTS_SKIP;
863 /**********************************************/
864 /* PES packing parsing */
865 case MPEGTS_PESHEADER:
866 len = PES_HEADER_SIZE - pes->data_index;
871 memcpy(pes->header + pes->data_index, p, len);
872 pes->data_index += len;
875 if (pes->data_index == PES_HEADER_SIZE) {
876 pes->pes_header_size = pes->header[8] + 9;
877 pes->state = MPEGTS_PESHEADER_FILL;
880 case MPEGTS_PESHEADER_FILL:
881 len = pes->pes_header_size - pes->data_index;
886 memcpy(pes->header + pes->data_index, p, len);
887 pes->data_index += len;
890 if (pes->data_index == pes->pes_header_size) {
892 unsigned int flags, pes_ext, skip;
894 flags = pes->header[7];
896 pes->pts = AV_NOPTS_VALUE;
897 pes->dts = AV_NOPTS_VALUE;
898 if ((flags & 0xc0) == 0x80) {
899 pes->dts = pes->pts = ff_parse_pes_pts(r);
901 } else if ((flags & 0xc0) == 0xc0) {
902 pes->pts = ff_parse_pes_pts(r);
904 pes->dts = ff_parse_pes_pts(r);
907 pes->extended_stream_id = -1;
908 if (flags & 0x01) { /* PES extension */
910 /* Skip PES private data, program packet sequence counter and P-STD buffer */
911 skip = (pes_ext >> 4) & 0xb;
914 if ((pes_ext & 0x41) == 0x01 &&
915 (r + 2) <= (pes->header + pes->pes_header_size)) {
916 /* PES extension 2 */
917 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
918 pes->extended_stream_id = r[1];
922 /* we got the full header. We parse it and get the payload */
923 pes->state = MPEGTS_PAYLOAD;
925 if (pes->stream_type == 0x12 && buf_size > 0) {
926 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
927 pes->pes_header_size += sl_header_bytes;
928 p += sl_header_bytes;
929 buf_size -= sl_header_bytes;
934 if (buf_size > 0 && pes->buffer) {
935 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
936 new_pes_packet(pes, ts->pkt);
937 pes->total_size = MAX_PES_PAYLOAD;
938 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
940 return AVERROR(ENOMEM);
942 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
943 // pes packet size is < ts size packet and pes data is padded with 0xff
944 // not sure if this is legal in ts but see issue #2392
945 buf_size = pes->total_size;
947 memcpy(pes->buffer+pes->data_index, p, buf_size);
948 pes->data_index += buf_size;
951 /* emit complete packets with known packet size
952 * decreases demuxer delay for infrequent packets like subtitles from
953 * a couple of seconds to milliseconds for properly muxed files.
954 * total_size is the number of bytes following pes_packet_length
955 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
956 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
957 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
959 new_pes_packet(pes, ts->pkt);
971 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
976 /* if no pid found, then add a pid context */
977 pes = av_mallocz(sizeof(PESContext));
981 pes->stream = ts->stream;
983 pes->pcr_pid = pcr_pid;
984 pes->state = MPEGTS_SKIP;
985 pes->pts = AV_NOPTS_VALUE;
986 pes->dts = AV_NOPTS_VALUE;
987 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1000 Mp4Descr *active_descr;
1002 int max_descr_count;
1004 } MP4DescrParseContext;
1006 static int init_MP4DescrParseContext(
1007 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
1008 unsigned size, Mp4Descr *descr, int max_descr_count)
1012 return AVERROR_INVALIDDATA;
1014 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
1015 NULL, NULL, NULL, NULL)) < 0)
1022 d->active_descr = NULL;
1023 d->max_descr_count = max_descr_count;
1028 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
1029 int64_t new_off = avio_tell(pb);
1030 (*len) -= new_off - *off;
1034 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1037 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1040 if (parse_mp4_descr(d, off, len, 0) < 0)
1042 update_offsets(&d->pb, &off, &len);
1047 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1049 avio_rb16(&d->pb); // ID
1055 update_offsets(&d->pb, &off, &len);
1056 return parse_mp4_descr_arr(d, off, len);
1059 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1064 id_flags = avio_rb16(&d->pb);
1065 if (!(id_flags & 0x0020)) { //URL_Flag
1066 update_offsets(&d->pb, &off, &len);
1067 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1073 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1076 if (d->descr_count >= d->max_descr_count)
1078 ff_mp4_parse_es_descr(&d->pb, &es_id);
1079 d->active_descr = d->descr + (d->descr_count++);
1081 d->active_descr->es_id = es_id;
1082 update_offsets(&d->pb, &off, &len);
1083 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1084 update_offsets(&d->pb, &off, &len);
1086 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1087 d->active_descr = NULL;
1091 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1093 Mp4Descr *descr = d->active_descr;
1096 d->active_descr->dec_config_descr = av_malloc(len);
1097 if (!descr->dec_config_descr)
1098 return AVERROR(ENOMEM);
1099 descr->dec_config_descr_len = len;
1100 avio_read(&d->pb, descr->dec_config_descr, len);
1104 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1106 Mp4Descr *descr = d->active_descr;
1111 predefined = avio_r8(&d->pb);
1114 int flags = avio_r8(&d->pb);
1115 descr->sl.use_au_start = !!(flags & 0x80);
1116 descr->sl.use_au_end = !!(flags & 0x40);
1117 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1118 descr->sl.use_padding = !!(flags & 0x08);
1119 descr->sl.use_timestamps = !!(flags & 0x04);
1120 descr->sl.use_idle = !!(flags & 0x02);
1121 descr->sl.timestamp_res = avio_rb32(&d->pb);
1123 descr->sl.timestamp_len = avio_r8(&d->pb);
1124 descr->sl.ocr_len = avio_r8(&d->pb);
1125 descr->sl.au_len = avio_r8(&d->pb);
1126 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1127 lengths = avio_rb16(&d->pb);
1128 descr->sl.degr_prior_len = lengths >> 12;
1129 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1130 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1132 av_log_missing_feature(d->s, "Predefined SLConfigDescriptor", 0);
1137 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1140 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1141 update_offsets(&d->pb, &off, &len);
1142 if (len < 0 || len1 > len || len1 <= 0) {
1143 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1147 if (d->level++ >= MAX_LEVEL) {
1148 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1152 if (target_tag && tag != target_tag) {
1153 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1159 parse_MP4IODescrTag(d, off, len1);
1162 parse_MP4ODescrTag(d, off, len1);
1165 parse_MP4ESDescrTag(d, off, len1);
1167 case MP4DecConfigDescrTag:
1168 parse_MP4DecConfigDescrTag(d, off, len1);
1171 parse_MP4SLDescrTag(d, off, len1);
1177 avio_seek(&d->pb, off + len1, SEEK_SET);
1181 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1182 Mp4Descr *descr, int *descr_count, int max_descr_count)
1184 MP4DescrParseContext d;
1185 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1188 parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1190 *descr_count = d.descr_count;
1194 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1195 Mp4Descr *descr, int *descr_count, int max_descr_count)
1197 MP4DescrParseContext d;
1198 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1201 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1203 *descr_count = d.descr_count;
1207 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1209 MpegTSContext *ts = filter->u.section_filter.opaque;
1211 const uint8_t *p, *p_end;
1213 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1214 int mp4_descr_count = 0;
1216 AVFormatContext *s = ts->stream;
1218 p_end = section + section_len - 4;
1220 if (parse_section_header(&h, &p, p_end) < 0)
1222 if (h.tid != M4OD_TID)
1225 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1227 for (pid = 0; pid < NB_PID_MAX; pid++) {
1230 for (i = 0; i < mp4_descr_count; i++) {
1233 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1235 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1236 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1239 pes = ts->pids[pid]->u.pes_filter.opaque;
1245 pes->sl = mp4_descr[i].sl;
1247 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1248 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1249 ff_mp4_read_dec_config_descr(s, st, &pb);
1250 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1251 st->codec->extradata_size > 0)
1252 st->need_parsing = 0;
1253 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1254 st->codec->extradata_size > 0)
1255 st->need_parsing = 0;
1257 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1258 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO) {
1259 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1260 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE) {
1261 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1262 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN) {
1263 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1267 for (i = 0; i < mp4_descr_count; i++)
1268 av_free(mp4_descr[i].dec_config_descr);
1271 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1272 const uint8_t **pp, const uint8_t *desc_list_end,
1273 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1276 const uint8_t *desc_end;
1277 int desc_len, desc_tag, desc_es_id;
1281 desc_tag = get8(pp, desc_list_end);
1284 desc_len = get8(pp, desc_list_end);
1287 desc_end = *pp + desc_len;
1288 if (desc_end > desc_list_end)
1291 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1293 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1294 stream_type == STREAM_TYPE_PRIVATE_DATA)
1295 mpegts_find_stream_type(st, desc_tag, DESC_types);
1298 case 0x1E: /* SL descriptor */
1299 desc_es_id = get16(pp, desc_end);
1300 if (ts && ts->pids[pid])
1301 ts->pids[pid]->es_id = desc_es_id;
1302 for (i = 0; i < mp4_descr_count; i++)
1303 if (mp4_descr[i].dec_config_descr_len &&
1304 mp4_descr[i].es_id == desc_es_id) {
1306 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1307 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1308 ff_mp4_read_dec_config_descr(fc, st, &pb);
1309 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1310 st->codec->extradata_size > 0)
1311 st->need_parsing = 0;
1312 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1313 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1316 case 0x1F: /* FMC descriptor */
1317 get16(pp, desc_end);
1318 if (mp4_descr_count > 0 && (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe>0) &&
1319 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1321 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1322 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1323 ff_mp4_read_dec_config_descr(fc, st, &pb);
1324 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1325 st->codec->extradata_size > 0){
1326 st->request_probe= st->need_parsing = 0;
1327 st->codec->codec_type= AVMEDIA_TYPE_AUDIO;
1331 case 0x56: /* DVB teletext descriptor */
1332 language[0] = get8(pp, desc_end);
1333 language[1] = get8(pp, desc_end);
1334 language[2] = get8(pp, desc_end);
1336 av_dict_set(&st->metadata, "language", language, 0);
1338 case 0x59: /* subtitling descriptor */
1339 language[0] = get8(pp, desc_end);
1340 language[1] = get8(pp, desc_end);
1341 language[2] = get8(pp, desc_end);
1343 /* hearing impaired subtitles detection */
1344 switch(get8(pp, desc_end)) {
1345 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1346 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1347 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1348 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1349 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1350 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1351 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1354 if (st->codec->extradata) {
1355 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1356 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1358 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1359 if (st->codec->extradata) {
1360 st->codec->extradata_size = 4;
1361 memcpy(st->codec->extradata, *pp, 4);
1365 av_dict_set(&st->metadata, "language", language, 0);
1367 case 0x0a: /* ISO 639 language descriptor */
1368 for (i = 0; i + 4 <= desc_len; i += 4) {
1369 language[i + 0] = get8(pp, desc_end);
1370 language[i + 1] = get8(pp, desc_end);
1371 language[i + 2] = get8(pp, desc_end);
1372 language[i + 3] = ',';
1373 switch (get8(pp, desc_end)) {
1374 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1375 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1376 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1380 language[i - 1] = 0;
1381 av_dict_set(&st->metadata, "language", language, 0);
1384 case 0x05: /* registration descriptor */
1385 st->codec->codec_tag = bytestream_get_le32(pp);
1386 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1387 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1388 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1390 case 0x52: /* stream identifier descriptor */
1391 st->stream_identifier = 1 + get8(pp, desc_end);
1400 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1402 MpegTSContext *ts = filter->u.section_filter.opaque;
1403 SectionHeader h1, *h = &h1;
1406 const uint8_t *p, *p_end, *desc_list_end;
1407 int program_info_length, pcr_pid, pid, stream_type;
1409 uint32_t prog_reg_desc = 0; /* registration descriptor */
1411 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1412 int mp4_descr_count = 0;
1415 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1416 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1418 p_end = section + section_len - 4;
1420 if (parse_section_header(h, &p, p_end) < 0)
1423 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1424 h->id, h->sec_num, h->last_sec_num);
1426 if (h->tid != PMT_TID)
1429 clear_program(ts, h->id);
1430 pcr_pid = get16(&p, p_end);
1434 add_pid_to_pmt(ts, h->id, pcr_pid);
1435 set_pcr_pid(ts->stream, h->id, pcr_pid);
1437 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1439 program_info_length = get16(&p, p_end);
1440 if (program_info_length < 0)
1442 program_info_length &= 0xfff;
1443 while(program_info_length >= 2) {
1445 tag = get8(&p, p_end);
1446 len = get8(&p, p_end);
1448 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1450 if(len > program_info_length - 2)
1451 //something else is broken, exit the program_descriptors_loop
1453 program_info_length -= len + 2;
1454 if (tag == 0x1d) { // IOD descriptor
1455 get8(&p, p_end); // scope
1456 get8(&p, p_end); // label
1458 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1459 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1460 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1461 prog_reg_desc = bytestream_get_le32(&p);
1466 p += program_info_length;
1470 // stop parsing after pmt, we found header
1471 if (!ts->stream->nb_streams)
1477 stream_type = get8(&p, p_end);
1478 if (stream_type < 0)
1480 pid = get16(&p, p_end);
1485 /* now create stream */
1486 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1487 pes = ts->pids[pid]->u.pes_filter.opaque;
1489 pes->st = avformat_new_stream(pes->stream, NULL);
1490 pes->st->id = pes->pid;
1493 } else if (stream_type != 0x13) {
1494 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1495 pes = add_pes_stream(ts, pid, pcr_pid);
1497 st = avformat_new_stream(pes->stream, NULL);
1501 int idx = ff_find_stream_index(ts->stream, pid);
1503 st = ts->stream->streams[idx];
1505 st = avformat_new_stream(ts->stream, NULL);
1507 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1514 if (pes && !pes->stream_type)
1515 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1517 add_pid_to_pmt(ts, h->id, pid);
1519 ff_program_add_stream_index(ts->stream, h->id, st->index);
1521 desc_list_len = get16(&p, p_end);
1522 if (desc_list_len < 0)
1524 desc_list_len &= 0xfff;
1525 desc_list_end = p + desc_list_len;
1526 if (desc_list_end > p_end)
1529 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1530 mp4_descr, mp4_descr_count, pid, ts) < 0)
1533 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1534 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1535 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1542 for (i = 0; i < mp4_descr_count; i++)
1543 av_free(mp4_descr[i].dec_config_descr);
1546 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1548 MpegTSContext *ts = filter->u.section_filter.opaque;
1549 SectionHeader h1, *h = &h1;
1550 const uint8_t *p, *p_end;
1554 av_dlog(ts->stream, "PAT:\n");
1555 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1557 p_end = section + section_len - 4;
1559 if (parse_section_header(h, &p, p_end) < 0)
1561 if (h->tid != PAT_TID)
1564 ts->stream->ts_id = h->id;
1568 sid = get16(&p, p_end);
1571 pmt_pid = get16(&p, p_end);
1576 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1578 if (sid == 0x0000) {
1581 program = av_new_program(ts->stream, sid);
1582 program->program_num = sid;
1583 program->pmt_pid = pmt_pid;
1584 if (ts->pids[pmt_pid])
1585 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1586 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1587 add_pat_entry(ts, sid);
1588 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1589 add_pid_to_pmt(ts, sid, pmt_pid);
1594 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1596 MpegTSContext *ts = filter->u.section_filter.opaque;
1597 SectionHeader h1, *h = &h1;
1598 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1599 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1600 char *name, *provider_name;
1602 av_dlog(ts->stream, "SDT:\n");
1603 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1605 p_end = section + section_len - 4;
1607 if (parse_section_header(h, &p, p_end) < 0)
1609 if (h->tid != SDT_TID)
1611 onid = get16(&p, p_end);
1614 val = get8(&p, p_end);
1618 sid = get16(&p, p_end);
1621 val = get8(&p, p_end);
1624 desc_list_len = get16(&p, p_end);
1625 if (desc_list_len < 0)
1627 desc_list_len &= 0xfff;
1628 desc_list_end = p + desc_list_len;
1629 if (desc_list_end > p_end)
1632 desc_tag = get8(&p, desc_list_end);
1635 desc_len = get8(&p, desc_list_end);
1636 desc_end = p + desc_len;
1637 if (desc_end > desc_list_end)
1640 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1641 desc_tag, desc_len);
1645 service_type = get8(&p, p_end);
1646 if (service_type < 0)
1648 provider_name = getstr8(&p, p_end);
1651 name = getstr8(&p, p_end);
1653 AVProgram *program = av_new_program(ts->stream, sid);
1655 av_dict_set(&program->metadata, "service_name", name, 0);
1656 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1660 av_free(provider_name);
1671 /* handle one TS packet */
1672 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1674 AVFormatContext *s = ts->stream;
1676 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1677 has_adaptation, has_payload;
1678 const uint8_t *p, *p_end;
1681 pid = AV_RB16(packet + 1) & 0x1fff;
1682 if(pid && discard_pid(ts, pid))
1684 is_start = packet[1] & 0x40;
1685 tss = ts->pids[pid];
1686 if (ts->auto_guess && tss == NULL && is_start) {
1687 add_pes_stream(ts, pid, -1);
1688 tss = ts->pids[pid];
1693 afc = (packet[3] >> 4) & 3;
1694 if (afc == 0) /* reserved value */
1696 has_adaptation = afc & 2;
1697 has_payload = afc & 1;
1698 is_discontinuity = has_adaptation
1699 && packet[4] != 0 /* with length > 0 */
1700 && (packet[5] & 0x80); /* and discontinuity indicated */
1702 /* continuity check (currently not used) */
1703 cc = (packet[3] & 0xf);
1704 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1705 cc_ok = pid == 0x1FFF // null packet PID
1708 || expected_cc == cc;
1712 av_log(ts->stream, AV_LOG_DEBUG,
1713 "Continuity check failed for pid %d expected %d got %d\n",
1714 pid, expected_cc, cc);
1715 if(tss->type == MPEGTS_PES) {
1716 PESContext *pc = tss->u.pes_filter.opaque;
1717 pc->flags |= AV_PKT_FLAG_CORRUPT;
1724 if (has_adaptation) {
1725 /* skip adaptation field */
1728 /* if past the end of packet, ignore */
1729 p_end = packet + TS_PACKET_SIZE;
1733 pos = avio_tell(ts->stream->pb);
1734 ts->pos47= pos % ts->raw_packet_size;
1736 if (tss->type == MPEGTS_SECTION) {
1738 /* pointer field present */
1740 if (p + len > p_end)
1743 /* write remaining section bytes */
1744 write_section_data(s, tss,
1746 /* check whether filter has been closed */
1752 write_section_data(s, tss,
1757 write_section_data(s, tss,
1763 // Note: The position here points actually behind the current packet.
1764 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1765 pos - ts->raw_packet_size)) < 0)
1772 /* XXX: try to find a better synchro over several packets (use
1773 get_packet_size() ?) */
1774 static int mpegts_resync(AVFormatContext *s)
1776 AVIOContext *pb = s->pb;
1779 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1784 avio_seek(pb, -1, SEEK_CUR);
1788 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1793 /* return -1 if error or EOF. Return 0 if OK. */
1794 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1796 AVIOContext *pb = s->pb;
1800 len = avio_read(pb, buf, TS_PACKET_SIZE);
1801 if (len != TS_PACKET_SIZE)
1802 return len < 0 ? len : AVERROR_EOF;
1803 /* check packet sync byte */
1804 if (buf[0] != 0x47) {
1805 /* find a new packet start */
1806 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1807 if (mpegts_resync(s) < 0)
1808 return AVERROR(EAGAIN);
1812 skip = raw_packet_size - TS_PACKET_SIZE;
1814 avio_skip(pb, skip);
1821 static int handle_packets(MpegTSContext *ts, int nb_packets)
1823 AVFormatContext *s = ts->stream;
1824 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
1825 int packet_num, ret = 0;
1827 if (avio_tell(s->pb) != ts->last_pos) {
1829 av_dlog(ts->stream, "Skipping after seek\n");
1830 /* seek detected, flush pes buffer */
1831 for (i = 0; i < NB_PID_MAX; i++) {
1833 if (ts->pids[i]->type == MPEGTS_PES) {
1834 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1835 av_freep(&pes->buffer);
1836 pes->data_index = 0;
1837 pes->state = MPEGTS_SKIP; /* skip until pes header */
1839 ts->pids[i]->last_cc = -1;
1846 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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)
1870 const int size= p->buf_size;
1871 int score, fec_score, dvhs_score;
1872 int check_count= size / TS_FEC_PACKET_SIZE;
1873 #define CHECK_COUNT 10
1875 if (check_count < CHECK_COUNT)
1878 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1879 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1880 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1881 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1883 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1884 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1885 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1886 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1890 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1891 (-1) if not available */
1892 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1893 const uint8_t *packet)
1895 int afc, len, flags;
1899 afc = (packet[3] >> 4) & 3;
1909 if (!(flags & 0x10))
1914 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1915 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1919 static int mpegts_read_header(AVFormatContext *s)
1921 MpegTSContext *ts = s->priv_data;
1922 AVIOContext *pb = s->pb;
1923 uint8_t buf[8*1024]={0};
1927 /* read the first 8192 bytes to get packet size */
1928 pos = avio_tell(pb);
1929 len = avio_read(pb, buf, sizeof(buf));
1930 ts->raw_packet_size = get_packet_size(buf, len);
1931 if (ts->raw_packet_size <= 0) {
1932 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1933 ts->raw_packet_size = TS_PACKET_SIZE;
1938 if (s->iformat == &ff_mpegts_demuxer) {
1941 /* first do a scan to get all the services */
1942 /* NOTE: We attempt to seek on non-seekable files as well, as the
1943 * probe buffer usually is big enough. Only warn if the seek failed
1944 * on files where the seek should work. */
1945 if (avio_seek(pb, pos, SEEK_SET) < 0)
1946 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
1948 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1950 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1952 handle_packets(ts, s->probesize / ts->raw_packet_size);
1953 /* if could not find service, enable auto_guess */
1957 av_dlog(ts->stream, "tuning done\n");
1959 s->ctx_flags |= AVFMTCTX_NOHEADER;
1962 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1963 int64_t pcrs[2], pcr_h;
1964 int packet_count[2];
1965 uint8_t packet[TS_PACKET_SIZE];
1967 /* only read packets */
1969 st = avformat_new_stream(s, NULL);
1972 avpriv_set_pts_info(st, 60, 1, 27000000);
1973 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1974 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
1976 /* we iterate until we find two PCRs to estimate the bitrate */
1981 ret = read_packet(s, packet, ts->raw_packet_size);
1984 pid = AV_RB16(packet + 1) & 0x1fff;
1985 if ((pcr_pid == -1 || pcr_pid == pid) &&
1986 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1988 packet_count[nb_pcrs] = nb_packets;
1989 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1997 /* NOTE1: the bitrate is computed without the FEC */
1998 /* NOTE2: it is only the bitrate of the start of the stream */
1999 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2000 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2001 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
2002 st->codec->bit_rate = s->bit_rate;
2003 st->start_time = ts->cur_pcr;
2004 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2005 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2008 avio_seek(pb, pos, SEEK_SET);
2014 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2016 static int mpegts_raw_read_packet(AVFormatContext *s,
2019 MpegTSContext *ts = s->priv_data;
2021 int64_t pcr_h, next_pcr_h, pos;
2022 int pcr_l, next_pcr_l;
2023 uint8_t pcr_buf[12];
2025 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2026 return AVERROR(ENOMEM);
2027 pkt->pos= avio_tell(s->pb);
2028 ret = read_packet(s, pkt->data, ts->raw_packet_size);
2030 av_free_packet(pkt);
2033 if (ts->mpeg2ts_compute_pcr) {
2034 /* compute exact PCR for each packet */
2035 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2036 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2037 pos = avio_tell(s->pb);
2038 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
2039 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2040 avio_read(s->pb, pcr_buf, 12);
2041 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2042 /* XXX: not precise enough */
2043 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2048 avio_seek(s->pb, pos, SEEK_SET);
2049 /* no next PCR found: we use previous increment */
2050 ts->cur_pcr = pcr_h * 300 + pcr_l;
2052 pkt->pts = ts->cur_pcr;
2053 pkt->duration = ts->pcr_incr;
2054 ts->cur_pcr += ts->pcr_incr;
2056 pkt->stream_index = 0;
2060 static int mpegts_read_packet(AVFormatContext *s,
2063 MpegTSContext *ts = s->priv_data;
2068 ret = handle_packets(ts, 0);
2070 av_free_packet(ts->pkt);
2071 /* flush pes data left */
2072 for (i = 0; i < NB_PID_MAX; i++) {
2073 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2074 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2075 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2076 new_pes_packet(pes, pkt);
2077 pes->state = MPEGTS_SKIP;
2085 if (!ret && pkt->size < 0)
2086 ret = AVERROR(EINTR);
2090 static int mpegts_read_close(AVFormatContext *s)
2092 MpegTSContext *ts = s->priv_data;
2097 for(i=0;i<NB_PID_MAX;i++)
2098 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2103 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2104 int64_t *ppos, int64_t pos_limit)
2106 MpegTSContext *ts = s->priv_data;
2107 int64_t pos, timestamp;
2108 uint8_t buf[TS_PACKET_SIZE];
2109 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2110 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2111 while(pos < pos_limit) {
2112 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2113 return AV_NOPTS_VALUE;
2114 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2115 return AV_NOPTS_VALUE;
2116 if (buf[0] != 0x47) {
2117 if (mpegts_resync(s) < 0)
2118 return AV_NOPTS_VALUE;
2119 pos = avio_tell(s->pb);
2122 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2123 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2127 pos += ts->raw_packet_size;
2130 return AV_NOPTS_VALUE;
2133 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2134 int64_t *ppos, int64_t pos_limit)
2136 MpegTSContext *ts = s->priv_data;
2138 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2139 ff_read_frame_flush(s);
2140 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2141 return AV_NOPTS_VALUE;
2142 while(pos < pos_limit) {
2145 av_init_packet(&pkt);
2146 ret= av_read_frame(s, &pkt);
2148 return AV_NOPTS_VALUE;
2149 av_free_packet(&pkt);
2150 if(pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0){
2151 ff_reduce_index(s, pkt.stream_index);
2152 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2153 if(pkt.stream_index == stream_index){
2161 return AV_NOPTS_VALUE;
2164 /**************************************************************/
2165 /* parsing functions - called from other demuxers such as RTP */
2167 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2171 ts = av_mallocz(sizeof(MpegTSContext));
2174 /* no stream case, currently used by RTP */
2175 ts->raw_packet_size = TS_PACKET_SIZE;
2178 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2179 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2184 /* return the consumed length if a packet was output, or -1 if no
2186 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2187 const uint8_t *buf, int len)
2195 if (len < TS_PACKET_SIZE)
2197 if (buf[0] != 0x47) {
2201 handle_packet(ts, buf);
2202 buf += TS_PACKET_SIZE;
2203 len -= TS_PACKET_SIZE;
2204 if (ts->stop_parse == 1)
2211 void ff_mpegts_parse_close(MpegTSContext *ts)
2215 for(i=0;i<NB_PID_MAX;i++)
2216 av_free(ts->pids[i]);
2220 AVInputFormat ff_mpegts_demuxer = {
2222 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2223 .priv_data_size = sizeof(MpegTSContext),
2224 .read_probe = mpegts_probe,
2225 .read_header = mpegts_read_header,
2226 .read_packet = mpegts_read_packet,
2227 .read_close = mpegts_read_close,
2228 .read_timestamp = mpegts_get_dts,
2229 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2232 AVInputFormat ff_mpegtsraw_demuxer = {
2233 .name = "mpegtsraw",
2234 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2235 .priv_data_size = sizeof(MpegTSContext),
2236 .read_header = mpegts_read_header,
2237 .read_packet = mpegts_raw_read_packet,
2238 .read_close = mpegts_read_close,
2239 .read_timestamp = mpegts_get_dts,
2240 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2241 .priv_class = &mpegtsraw_class,