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 */
126 int8_t crc_validity[NB_PID_MAX];
128 /** filters for various streams specified by PMT + for the PAT and PMT */
129 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 {.i64 = 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 MpegTSContext *ts = s->priv_data;
283 MpegTSSectionFilter *tss = &tss1->u.section_filter;
287 memcpy(tss->section_buf, buf, buf_size);
288 tss->section_index = buf_size;
289 tss->section_h_size = -1;
290 tss->end_of_section_reached = 0;
292 if (tss->end_of_section_reached)
294 len = 4096 - tss->section_index;
297 memcpy(tss->section_buf + tss->section_index, buf, len);
298 tss->section_index += len;
301 /* compute section length if possible */
302 if (tss->section_h_size == -1 && tss->section_index >= 3) {
303 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
306 tss->section_h_size = len;
309 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
311 tss->end_of_section_reached = 1;
314 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
316 ts->crc_validity[ tss1->pid ] = 100;
317 }else if(ts->crc_validity[ tss1->pid ] > -10){
318 ts->crc_validity[ tss1->pid ]--;
323 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
327 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
328 SectionCallback *section_cb, void *opaque,
332 MpegTSFilter *filter;
333 MpegTSSectionFilter *sec;
335 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
337 if (pid >= NB_PID_MAX || ts->pids[pid])
339 filter = av_mallocz(sizeof(MpegTSFilter));
342 ts->pids[pid] = filter;
343 filter->type = MPEGTS_SECTION;
346 filter->last_cc = -1;
347 sec = &filter->u.section_filter;
348 sec->section_cb = section_cb;
349 sec->opaque = opaque;
350 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
351 sec->check_crc = check_crc;
352 if (!sec->section_buf) {
359 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
363 MpegTSFilter *filter;
364 MpegTSPESFilter *pes;
366 if (pid >= NB_PID_MAX || ts->pids[pid])
368 filter = av_mallocz(sizeof(MpegTSFilter));
371 ts->pids[pid] = filter;
372 filter->type = MPEGTS_PES;
375 filter->last_cc = -1;
376 pes = &filter->u.pes_filter;
377 pes->pes_cb = pes_cb;
378 pes->opaque = opaque;
382 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
387 if (filter->type == MPEGTS_SECTION)
388 av_freep(&filter->u.section_filter.section_buf);
389 else if (filter->type == MPEGTS_PES) {
390 PESContext *pes = filter->u.pes_filter.opaque;
391 av_freep(&pes->buffer);
392 /* referenced private data will be freed later in
393 * avformat_close_input */
394 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
395 av_freep(&filter->u.pes_filter.opaque);
400 ts->pids[pid] = NULL;
403 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
404 int stat[TS_MAX_PACKET_SIZE];
409 memset(stat, 0, packet_size*sizeof(int));
411 for(x=i=0; i<size-3; i++){
412 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){
414 if(stat[x] > best_score){
421 if(x == packet_size) x= 0;
427 /* autodetect fec presence. Must have at least 1024 bytes */
428 static int get_packet_size(const uint8_t *buf, int size)
430 int score, fec_score, dvhs_score;
432 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
435 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
436 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
437 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
438 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
439 score, dvhs_score, fec_score);
441 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
442 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
443 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
447 typedef struct SectionHeader {
452 uint8_t last_sec_num;
455 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
468 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
474 if ((p + 1) >= p_end)
482 /* read and allocate a DVB string preceded by its length */
483 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
490 len = get8(&p, p_end);
493 if ((p + len) > p_end)
495 str = av_malloc(len + 1);
505 static int parse_section_header(SectionHeader *h,
506 const uint8_t **pp, const uint8_t *p_end)
510 val = get8(pp, p_end);
515 val = get16(pp, p_end);
519 val = get8(pp, p_end);
522 h->version = (val >> 1) & 0x1f;
523 val = get8(pp, p_end);
527 val = get8(pp, p_end);
530 h->last_sec_num = val;
535 uint32_t stream_type;
536 enum AVMediaType codec_type;
537 enum AVCodecID codec_id;
540 static const StreamType ISO_types[] = {
541 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
542 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
543 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
544 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
545 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
546 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
547 /* Makito encoder sets stream type 0x11 for AAC,
548 * so auto-detect LOAS/LATM instead of hardcoding it. */
549 // { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
550 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
551 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
552 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
556 static const StreamType HDMV_types[] = {
557 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
558 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
559 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
560 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
561 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
562 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
563 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
564 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
565 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
566 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
571 static const StreamType MISC_types[] = {
572 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
573 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
577 static const StreamType REGD_types[] = {
578 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
579 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
580 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
581 { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
582 { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
583 { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
584 { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
588 /* descriptor present */
589 static const StreamType DESC_types[] = {
590 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
591 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
592 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
593 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
594 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
598 static void mpegts_find_stream_type(AVStream *st,
599 uint32_t stream_type, const StreamType *types)
601 for (; types->stream_type; types++) {
602 if (stream_type == types->stream_type) {
603 st->codec->codec_type = types->codec_type;
604 st->codec->codec_id = types->codec_id;
605 st->request_probe = 0;
611 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
612 uint32_t stream_type, uint32_t prog_reg_desc)
614 int old_codec_type= st->codec->codec_type;
615 int old_codec_id = st->codec->codec_id;
617 if (old_codec_id != AV_CODEC_ID_NONE && avcodec_is_open(st->codec)) {
618 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
622 avpriv_set_pts_info(st, 33, 1, 90000);
624 st->codec->codec_type = AVMEDIA_TYPE_DATA;
625 st->codec->codec_id = AV_CODEC_ID_NONE;
626 st->need_parsing = AVSTREAM_PARSE_FULL;
628 pes->stream_type = stream_type;
630 av_log(pes->stream, AV_LOG_DEBUG,
631 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
632 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
634 st->codec->codec_tag = pes->stream_type;
636 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
637 if ((prog_reg_desc == AV_RL32("HDMV") ||
638 prog_reg_desc == AV_RL32("HDPR")) &&
639 st->codec->codec_id == AV_CODEC_ID_NONE) {
640 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
641 if (pes->stream_type == 0x83) {
642 // HDMV TrueHD streams also contain an AC3 coded version of the
643 // audio track - add a second stream for this
645 // priv_data cannot be shared between streams
646 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
648 return AVERROR(ENOMEM);
649 memcpy(sub_pes, pes, sizeof(*sub_pes));
651 sub_st = avformat_new_stream(pes->stream, NULL);
654 return AVERROR(ENOMEM);
657 sub_st->id = pes->pid;
658 avpriv_set_pts_info(sub_st, 33, 1, 90000);
659 sub_st->priv_data = sub_pes;
660 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
661 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
662 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
663 sub_pes->sub_st = pes->sub_st = sub_st;
666 if (st->codec->codec_id == AV_CODEC_ID_NONE)
667 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
668 if (st->codec->codec_id == AV_CODEC_ID_NONE){
669 st->codec->codec_id = old_codec_id;
670 st->codec->codec_type= old_codec_type;
676 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
680 pkt->destruct = av_destruct_packet;
681 pkt->data = pes->buffer;
682 pkt->size = pes->data_index;
684 if(pes->total_size != MAX_PES_PAYLOAD &&
685 pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
686 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
687 pes->flags |= AV_PKT_FLAG_CORRUPT;
689 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
691 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
692 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
693 pkt->stream_index = pes->sub_st->index;
695 pkt->stream_index = pes->st->index;
698 /* store position of first TS packet of this PES packet */
699 pkt->pos = pes->ts_packet_pos;
700 pkt->flags = pes->flags;
702 /* reset pts values */
703 pes->pts = AV_NOPTS_VALUE;
704 pes->dts = AV_NOPTS_VALUE;
710 static uint64_t get_bits64(GetBitContext *gb, int bits)
714 if (get_bits_left(gb) < bits)
715 return AV_NOPTS_VALUE;
718 ret |= get_bits(gb, 17);
722 ret |= get_bits(gb, bits);
726 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
729 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
730 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
731 int dts_flag = -1, cts_flag = -1;
732 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
734 init_get_bits(&gb, buf, buf_size*8);
736 if (sl->use_au_start)
737 au_start_flag = get_bits1(&gb);
739 au_end_flag = get_bits1(&gb);
740 if (!sl->use_au_start && !sl->use_au_end)
741 au_start_flag = au_end_flag = 1;
743 ocr_flag = get_bits1(&gb);
745 idle_flag = get_bits1(&gb);
747 padding_flag = get_bits1(&gb);
749 padding_bits = get_bits(&gb, 3);
751 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
752 if (sl->packet_seq_num_len)
753 skip_bits_long(&gb, sl->packet_seq_num_len);
754 if (sl->degr_prior_len)
756 skip_bits(&gb, sl->degr_prior_len);
758 skip_bits_long(&gb, sl->ocr_len);
760 if (sl->use_rand_acc_pt)
762 if (sl->au_seq_num_len > 0)
763 skip_bits_long(&gb, sl->au_seq_num_len);
764 if (sl->use_timestamps) {
765 dts_flag = get_bits1(&gb);
766 cts_flag = get_bits1(&gb);
769 if (sl->inst_bitrate_len)
770 inst_bitrate_flag = get_bits1(&gb);
772 dts = get_bits64(&gb, sl->timestamp_len);
774 cts = get_bits64(&gb, sl->timestamp_len);
776 skip_bits_long(&gb, sl->au_len);
777 if (inst_bitrate_flag)
778 skip_bits_long(&gb, sl->inst_bitrate_len);
781 if (dts != AV_NOPTS_VALUE)
783 if (cts != AV_NOPTS_VALUE)
786 if (sl->timestamp_len && sl->timestamp_res)
787 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
789 return (get_bits_count(&gb) + 7) >> 3;
792 /* return non zero if a packet could be constructed */
793 static int mpegts_push_data(MpegTSFilter *filter,
794 const uint8_t *buf, int buf_size, int is_start,
797 PESContext *pes = filter->u.pes_filter.opaque;
798 MpegTSContext *ts = pes->ts;
806 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
807 new_pes_packet(pes, ts->pkt);
810 pes->state = MPEGTS_HEADER;
812 pes->ts_packet_pos = pos;
815 while (buf_size > 0) {
818 len = PES_START_SIZE - pes->data_index;
821 memcpy(pes->header + pes->data_index, p, len);
822 pes->data_index += len;
825 if (pes->data_index == PES_START_SIZE) {
826 /* we got all the PES or section header. We can now
828 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
829 pes->header[2] == 0x01) {
830 /* it must be an mpeg2 PES stream */
831 code = pes->header[3] | 0x100;
832 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
834 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
835 (!pes->sub_st || pes->sub_st->discard == AVDISCARD_ALL)) ||
836 code == 0x1be) /* padding_stream */
839 /* stream not present in PMT */
841 pes->st = avformat_new_stream(ts->stream, NULL);
843 return AVERROR(ENOMEM);
844 pes->st->id = pes->pid;
845 mpegts_set_stream_info(pes->st, pes, 0, 0);
848 pes->total_size = AV_RB16(pes->header + 4);
849 /* NOTE: a zero total size means the PES size is
851 if (!pes->total_size)
852 pes->total_size = MAX_PES_PAYLOAD;
854 /* allocate pes buffer */
855 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
857 return AVERROR(ENOMEM);
859 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
860 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
861 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
862 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
863 pes->state = MPEGTS_PESHEADER;
864 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
865 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
866 pes->pid, pes->stream_type);
867 pes->st->request_probe= 1;
870 pes->state = MPEGTS_PAYLOAD;
874 /* otherwise, it should be a table */
877 pes->state = MPEGTS_SKIP;
882 /**********************************************/
883 /* PES packing parsing */
884 case MPEGTS_PESHEADER:
885 len = PES_HEADER_SIZE - pes->data_index;
890 memcpy(pes->header + pes->data_index, p, len);
891 pes->data_index += len;
894 if (pes->data_index == PES_HEADER_SIZE) {
895 pes->pes_header_size = pes->header[8] + 9;
896 pes->state = MPEGTS_PESHEADER_FILL;
899 case MPEGTS_PESHEADER_FILL:
900 len = pes->pes_header_size - pes->data_index;
905 memcpy(pes->header + pes->data_index, p, len);
906 pes->data_index += len;
909 if (pes->data_index == pes->pes_header_size) {
911 unsigned int flags, pes_ext, skip;
913 flags = pes->header[7];
915 pes->pts = AV_NOPTS_VALUE;
916 pes->dts = AV_NOPTS_VALUE;
917 if ((flags & 0xc0) == 0x80) {
918 pes->dts = pes->pts = ff_parse_pes_pts(r);
920 } else if ((flags & 0xc0) == 0xc0) {
921 pes->pts = ff_parse_pes_pts(r);
923 pes->dts = ff_parse_pes_pts(r);
926 pes->extended_stream_id = -1;
927 if (flags & 0x01) { /* PES extension */
929 /* Skip PES private data, program packet sequence counter and P-STD buffer */
930 skip = (pes_ext >> 4) & 0xb;
933 if ((pes_ext & 0x41) == 0x01 &&
934 (r + 2) <= (pes->header + pes->pes_header_size)) {
935 /* PES extension 2 */
936 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
937 pes->extended_stream_id = r[1];
941 /* we got the full header. We parse it and get the payload */
942 pes->state = MPEGTS_PAYLOAD;
944 if (pes->stream_type == 0x12 && buf_size > 0) {
945 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
946 pes->pes_header_size += sl_header_bytes;
947 p += sl_header_bytes;
948 buf_size -= sl_header_bytes;
953 if (buf_size > 0 && pes->buffer) {
954 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
955 new_pes_packet(pes, ts->pkt);
956 pes->total_size = MAX_PES_PAYLOAD;
957 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
959 return AVERROR(ENOMEM);
961 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
962 // pes packet size is < ts size packet and pes data is padded with 0xff
963 // not sure if this is legal in ts but see issue #2392
964 buf_size = pes->total_size;
966 memcpy(pes->buffer+pes->data_index, p, buf_size);
967 pes->data_index += buf_size;
970 /* emit complete packets with known packet size
971 * decreases demuxer delay for infrequent packets like subtitles from
972 * a couple of seconds to milliseconds for properly muxed files.
973 * total_size is the number of bytes following pes_packet_length
974 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
975 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
976 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
978 new_pes_packet(pes, ts->pkt);
990 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
995 /* if no pid found, then add a pid context */
996 pes = av_mallocz(sizeof(PESContext));
1000 pes->stream = ts->stream;
1002 pes->pcr_pid = pcr_pid;
1003 pes->state = MPEGTS_SKIP;
1004 pes->pts = AV_NOPTS_VALUE;
1005 pes->dts = AV_NOPTS_VALUE;
1006 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1019 Mp4Descr *active_descr;
1021 int max_descr_count;
1023 } MP4DescrParseContext;
1025 static int init_MP4DescrParseContext(
1026 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
1027 unsigned size, Mp4Descr *descr, int max_descr_count)
1031 return AVERROR_INVALIDDATA;
1033 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
1034 NULL, NULL, NULL, NULL)) < 0)
1041 d->active_descr = NULL;
1042 d->max_descr_count = max_descr_count;
1047 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
1048 int64_t new_off = avio_tell(pb);
1049 (*len) -= new_off - *off;
1053 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1056 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1059 if (parse_mp4_descr(d, off, len, 0) < 0)
1061 update_offsets(&d->pb, &off, &len);
1066 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1068 avio_rb16(&d->pb); // ID
1074 update_offsets(&d->pb, &off, &len);
1075 return parse_mp4_descr_arr(d, off, len);
1078 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1083 id_flags = avio_rb16(&d->pb);
1084 if (!(id_flags & 0x0020)) { //URL_Flag
1085 update_offsets(&d->pb, &off, &len);
1086 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1092 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1095 if (d->descr_count >= d->max_descr_count)
1097 ff_mp4_parse_es_descr(&d->pb, &es_id);
1098 d->active_descr = d->descr + (d->descr_count++);
1100 d->active_descr->es_id = es_id;
1101 update_offsets(&d->pb, &off, &len);
1102 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1103 update_offsets(&d->pb, &off, &len);
1105 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1106 d->active_descr = NULL;
1110 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1112 Mp4Descr *descr = d->active_descr;
1115 d->active_descr->dec_config_descr = av_malloc(len);
1116 if (!descr->dec_config_descr)
1117 return AVERROR(ENOMEM);
1118 descr->dec_config_descr_len = len;
1119 avio_read(&d->pb, descr->dec_config_descr, len);
1123 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1125 Mp4Descr *descr = d->active_descr;
1130 predefined = avio_r8(&d->pb);
1133 int flags = avio_r8(&d->pb);
1134 descr->sl.use_au_start = !!(flags & 0x80);
1135 descr->sl.use_au_end = !!(flags & 0x40);
1136 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1137 descr->sl.use_padding = !!(flags & 0x08);
1138 descr->sl.use_timestamps = !!(flags & 0x04);
1139 descr->sl.use_idle = !!(flags & 0x02);
1140 descr->sl.timestamp_res = avio_rb32(&d->pb);
1142 descr->sl.timestamp_len = avio_r8(&d->pb);
1143 descr->sl.ocr_len = avio_r8(&d->pb);
1144 descr->sl.au_len = avio_r8(&d->pb);
1145 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1146 lengths = avio_rb16(&d->pb);
1147 descr->sl.degr_prior_len = lengths >> 12;
1148 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1149 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1151 av_log_missing_feature(d->s, "Predefined SLConfigDescriptor", 0);
1156 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1159 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1160 update_offsets(&d->pb, &off, &len);
1161 if (len < 0 || len1 > len || len1 <= 0) {
1162 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1166 if (d->level++ >= MAX_LEVEL) {
1167 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1171 if (target_tag && tag != target_tag) {
1172 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1178 parse_MP4IODescrTag(d, off, len1);
1181 parse_MP4ODescrTag(d, off, len1);
1184 parse_MP4ESDescrTag(d, off, len1);
1186 case MP4DecConfigDescrTag:
1187 parse_MP4DecConfigDescrTag(d, off, len1);
1190 parse_MP4SLDescrTag(d, off, len1);
1196 avio_seek(&d->pb, off + len1, SEEK_SET);
1200 static int mp4_read_iods(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(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1209 *descr_count = d.descr_count;
1213 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1214 Mp4Descr *descr, int *descr_count, int max_descr_count)
1216 MP4DescrParseContext d;
1217 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1220 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1222 *descr_count = d.descr_count;
1226 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1228 MpegTSContext *ts = filter->u.section_filter.opaque;
1230 const uint8_t *p, *p_end;
1232 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1233 int mp4_descr_count = 0;
1235 AVFormatContext *s = ts->stream;
1237 p_end = section + section_len - 4;
1239 if (parse_section_header(&h, &p, p_end) < 0)
1241 if (h.tid != M4OD_TID)
1244 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1246 for (pid = 0; pid < NB_PID_MAX; pid++) {
1249 for (i = 0; i < mp4_descr_count; i++) {
1252 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1254 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1255 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1258 pes = ts->pids[pid]->u.pes_filter.opaque;
1264 pes->sl = mp4_descr[i].sl;
1266 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1267 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1268 ff_mp4_read_dec_config_descr(s, st, &pb);
1269 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1270 st->codec->extradata_size > 0)
1271 st->need_parsing = 0;
1272 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1273 st->codec->extradata_size > 0)
1274 st->need_parsing = 0;
1276 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1277 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO) {
1278 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1279 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE) {
1280 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1281 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN) {
1282 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1286 for (i = 0; i < mp4_descr_count; i++)
1287 av_free(mp4_descr[i].dec_config_descr);
1290 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1291 const uint8_t **pp, const uint8_t *desc_list_end,
1292 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1295 const uint8_t *desc_end;
1296 int desc_len, desc_tag, desc_es_id;
1300 desc_tag = get8(pp, desc_list_end);
1303 desc_len = get8(pp, desc_list_end);
1306 desc_end = *pp + desc_len;
1307 if (desc_end > desc_list_end)
1310 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1312 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1313 stream_type == STREAM_TYPE_PRIVATE_DATA)
1314 mpegts_find_stream_type(st, desc_tag, DESC_types);
1317 case 0x1E: /* SL descriptor */
1318 desc_es_id = get16(pp, desc_end);
1319 if (ts && ts->pids[pid])
1320 ts->pids[pid]->es_id = desc_es_id;
1321 for (i = 0; i < mp4_descr_count; i++)
1322 if (mp4_descr[i].dec_config_descr_len &&
1323 mp4_descr[i].es_id == desc_es_id) {
1325 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1326 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1327 ff_mp4_read_dec_config_descr(fc, st, &pb);
1328 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1329 st->codec->extradata_size > 0)
1330 st->need_parsing = 0;
1331 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1332 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1335 case 0x1F: /* FMC descriptor */
1336 get16(pp, desc_end);
1337 if (mp4_descr_count > 0 && (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe>0) &&
1338 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1340 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1341 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1342 ff_mp4_read_dec_config_descr(fc, st, &pb);
1343 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1344 st->codec->extradata_size > 0){
1345 st->request_probe= st->need_parsing = 0;
1346 st->codec->codec_type= AVMEDIA_TYPE_AUDIO;
1350 case 0x56: /* DVB teletext descriptor */
1351 language[0] = get8(pp, desc_end);
1352 language[1] = get8(pp, desc_end);
1353 language[2] = get8(pp, desc_end);
1355 av_dict_set(&st->metadata, "language", language, 0);
1357 case 0x59: /* subtitling descriptor */
1358 language[0] = get8(pp, desc_end);
1359 language[1] = get8(pp, desc_end);
1360 language[2] = get8(pp, desc_end);
1362 /* hearing impaired subtitles detection */
1363 switch(get8(pp, desc_end)) {
1364 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1365 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1366 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1367 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1368 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1369 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1370 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1373 if (st->codec->extradata) {
1374 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1375 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1377 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1378 if (st->codec->extradata) {
1379 st->codec->extradata_size = 4;
1380 memcpy(st->codec->extradata, *pp, 4);
1384 av_dict_set(&st->metadata, "language", language, 0);
1386 case 0x0a: /* ISO 639 language descriptor */
1387 for (i = 0; i + 4 <= desc_len; i += 4) {
1388 language[i + 0] = get8(pp, desc_end);
1389 language[i + 1] = get8(pp, desc_end);
1390 language[i + 2] = get8(pp, desc_end);
1391 language[i + 3] = ',';
1392 switch (get8(pp, desc_end)) {
1393 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1394 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1395 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1399 language[i - 1] = 0;
1400 av_dict_set(&st->metadata, "language", language, 0);
1403 case 0x05: /* registration descriptor */
1404 st->codec->codec_tag = bytestream_get_le32(pp);
1405 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1406 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1407 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1409 case 0x52: /* stream identifier descriptor */
1410 st->stream_identifier = 1 + get8(pp, desc_end);
1419 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1421 MpegTSContext *ts = filter->u.section_filter.opaque;
1422 SectionHeader h1, *h = &h1;
1425 const uint8_t *p, *p_end, *desc_list_end;
1426 int program_info_length, pcr_pid, pid, stream_type;
1428 uint32_t prog_reg_desc = 0; /* registration descriptor */
1430 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1431 int mp4_descr_count = 0;
1434 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1435 hex_dump_debug(ts->stream, section, section_len);
1437 p_end = section + section_len - 4;
1439 if (parse_section_header(h, &p, p_end) < 0)
1442 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1443 h->id, h->sec_num, h->last_sec_num);
1445 if (h->tid != PMT_TID)
1448 clear_program(ts, h->id);
1449 pcr_pid = get16(&p, p_end);
1453 add_pid_to_pmt(ts, h->id, pcr_pid);
1454 set_pcr_pid(ts->stream, h->id, pcr_pid);
1456 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1458 program_info_length = get16(&p, p_end);
1459 if (program_info_length < 0)
1461 program_info_length &= 0xfff;
1462 while(program_info_length >= 2) {
1464 tag = get8(&p, p_end);
1465 len = get8(&p, p_end);
1467 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1469 if(len > program_info_length - 2)
1470 //something else is broken, exit the program_descriptors_loop
1472 program_info_length -= len + 2;
1473 if (tag == 0x1d) { // IOD descriptor
1474 get8(&p, p_end); // scope
1475 get8(&p, p_end); // label
1477 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1478 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1479 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1480 prog_reg_desc = bytestream_get_le32(&p);
1485 p += program_info_length;
1489 // stop parsing after pmt, we found header
1490 if (!ts->stream->nb_streams)
1496 stream_type = get8(&p, p_end);
1497 if (stream_type < 0)
1499 pid = get16(&p, p_end);
1503 if (pid == ts->current_pid)
1506 /* now create stream */
1507 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1508 pes = ts->pids[pid]->u.pes_filter.opaque;
1510 pes->st = avformat_new_stream(pes->stream, NULL);
1511 pes->st->id = pes->pid;
1514 } else if (stream_type != 0x13) {
1515 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1516 pes = add_pes_stream(ts, pid, pcr_pid);
1518 st = avformat_new_stream(pes->stream, NULL);
1522 int idx = ff_find_stream_index(ts->stream, pid);
1524 st = ts->stream->streams[idx];
1526 st = avformat_new_stream(ts->stream, NULL);
1528 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1535 if (pes && !pes->stream_type)
1536 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1538 add_pid_to_pmt(ts, h->id, pid);
1540 ff_program_add_stream_index(ts->stream, h->id, st->index);
1542 desc_list_len = get16(&p, p_end);
1543 if (desc_list_len < 0)
1545 desc_list_len &= 0xfff;
1546 desc_list_end = p + desc_list_len;
1547 if (desc_list_end > p_end)
1550 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1551 mp4_descr, mp4_descr_count, pid, ts) < 0)
1554 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1555 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1556 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1563 for (i = 0; i < mp4_descr_count; i++)
1564 av_free(mp4_descr[i].dec_config_descr);
1567 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1569 MpegTSContext *ts = filter->u.section_filter.opaque;
1570 SectionHeader h1, *h = &h1;
1571 const uint8_t *p, *p_end;
1575 av_dlog(ts->stream, "PAT:\n");
1576 hex_dump_debug(ts->stream, section, section_len);
1578 p_end = section + section_len - 4;
1580 if (parse_section_header(h, &p, p_end) < 0)
1582 if (h->tid != PAT_TID)
1585 ts->stream->ts_id = h->id;
1589 sid = get16(&p, p_end);
1592 pmt_pid = get16(&p, p_end);
1597 if (pmt_pid == ts->current_pid)
1600 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1602 if (sid == 0x0000) {
1605 program = av_new_program(ts->stream, sid);
1606 program->program_num = sid;
1607 program->pmt_pid = pmt_pid;
1608 if (ts->pids[pmt_pid])
1609 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1610 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1611 add_pat_entry(ts, sid);
1612 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1613 add_pid_to_pmt(ts, sid, pmt_pid);
1618 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1620 MpegTSContext *ts = filter->u.section_filter.opaque;
1621 SectionHeader h1, *h = &h1;
1622 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1623 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1624 char *name, *provider_name;
1626 av_dlog(ts->stream, "SDT:\n");
1627 hex_dump_debug(ts->stream, section, section_len);
1629 p_end = section + section_len - 4;
1631 if (parse_section_header(h, &p, p_end) < 0)
1633 if (h->tid != SDT_TID)
1635 onid = get16(&p, p_end);
1638 val = get8(&p, p_end);
1642 sid = get16(&p, p_end);
1645 val = get8(&p, p_end);
1648 desc_list_len = get16(&p, p_end);
1649 if (desc_list_len < 0)
1651 desc_list_len &= 0xfff;
1652 desc_list_end = p + desc_list_len;
1653 if (desc_list_end > p_end)
1656 desc_tag = get8(&p, desc_list_end);
1659 desc_len = get8(&p, desc_list_end);
1660 desc_end = p + desc_len;
1661 if (desc_end > desc_list_end)
1664 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1665 desc_tag, desc_len);
1669 service_type = get8(&p, p_end);
1670 if (service_type < 0)
1672 provider_name = getstr8(&p, p_end);
1675 name = getstr8(&p, p_end);
1677 AVProgram *program = av_new_program(ts->stream, sid);
1679 av_dict_set(&program->metadata, "service_name", name, 0);
1680 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1684 av_free(provider_name);
1695 /* handle one TS packet */
1696 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1698 AVFormatContext *s = ts->stream;
1700 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1701 has_adaptation, has_payload;
1702 const uint8_t *p, *p_end;
1705 pid = AV_RB16(packet + 1) & 0x1fff;
1706 if(pid && discard_pid(ts, pid))
1708 is_start = packet[1] & 0x40;
1709 tss = ts->pids[pid];
1710 if (ts->auto_guess && tss == NULL && is_start) {
1711 add_pes_stream(ts, pid, -1);
1712 tss = ts->pids[pid];
1716 ts->current_pid = pid;
1718 afc = (packet[3] >> 4) & 3;
1719 if (afc == 0) /* reserved value */
1721 has_adaptation = afc & 2;
1722 has_payload = afc & 1;
1723 is_discontinuity = has_adaptation
1724 && packet[4] != 0 /* with length > 0 */
1725 && (packet[5] & 0x80); /* and discontinuity indicated */
1727 /* continuity check (currently not used) */
1728 cc = (packet[3] & 0xf);
1729 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1730 cc_ok = pid == 0x1FFF // null packet PID
1733 || expected_cc == cc;
1737 av_log(ts->stream, AV_LOG_DEBUG,
1738 "Continuity check failed for pid %d expected %d got %d\n",
1739 pid, expected_cc, cc);
1740 if(tss->type == MPEGTS_PES) {
1741 PESContext *pc = tss->u.pes_filter.opaque;
1742 pc->flags |= AV_PKT_FLAG_CORRUPT;
1749 if (has_adaptation) {
1750 /* skip adaptation field */
1753 /* if past the end of packet, ignore */
1754 p_end = packet + TS_PACKET_SIZE;
1758 pos = avio_tell(ts->stream->pb);
1759 ts->pos47= pos % ts->raw_packet_size;
1761 if (tss->type == MPEGTS_SECTION) {
1763 /* pointer field present */
1765 if (p + len > p_end)
1768 /* write remaining section bytes */
1769 write_section_data(s, tss,
1771 /* check whether filter has been closed */
1777 write_section_data(s, tss,
1782 write_section_data(s, tss,
1788 // Note: The position here points actually behind the current packet.
1789 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1790 pos - ts->raw_packet_size)) < 0)
1797 /* XXX: try to find a better synchro over several packets (use
1798 get_packet_size() ?) */
1799 static int mpegts_resync(AVFormatContext *s)
1801 AVIOContext *pb = s->pb;
1804 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1809 avio_seek(pb, -1, SEEK_CUR);
1813 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1818 /* return -1 if error or EOF. Return 0 if OK. */
1819 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1821 AVIOContext *pb = s->pb;
1825 len = avio_read(pb, buf, TS_PACKET_SIZE);
1826 if (len != TS_PACKET_SIZE)
1827 return len < 0 ? len : AVERROR_EOF;
1828 /* check packet sync byte */
1829 if (buf[0] != 0x47) {
1830 /* find a new packet start */
1831 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1832 if (mpegts_resync(s) < 0)
1833 return AVERROR(EAGAIN);
1837 skip = raw_packet_size - TS_PACKET_SIZE;
1839 avio_skip(pb, skip);
1846 static int handle_packets(MpegTSContext *ts, int nb_packets)
1848 AVFormatContext *s = ts->stream;
1849 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
1850 int packet_num, ret = 0;
1852 if (avio_tell(s->pb) != ts->last_pos) {
1854 av_dlog(ts->stream, "Skipping after seek\n");
1855 /* seek detected, flush pes buffer */
1856 for (i = 0; i < NB_PID_MAX; i++) {
1858 if (ts->pids[i]->type == MPEGTS_PES) {
1859 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1860 av_freep(&pes->buffer);
1861 pes->data_index = 0;
1862 pes->state = MPEGTS_SKIP; /* skip until pes header */
1864 ts->pids[i]->last_cc = -1;
1871 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1874 if (nb_packets != 0 && packet_num >= nb_packets ||
1875 ts->stop_parse > 1) {
1876 ret = AVERROR(EAGAIN);
1879 if (ts->stop_parse > 0)
1882 ret = read_packet(s, packet, ts->raw_packet_size);
1885 ret = handle_packet(ts, packet);
1889 ts->last_pos = avio_tell(s->pb);
1893 static int mpegts_probe(AVProbeData *p)
1895 const int size= p->buf_size;
1899 int check_count= size / TS_FEC_PACKET_SIZE;
1900 #define CHECK_COUNT 10
1901 #define CHECK_BLOCK 100
1903 if (check_count < CHECK_COUNT)
1906 for (i=0; i<check_count; i+=CHECK_BLOCK){
1907 int left = FFMIN(check_count - i, CHECK_BLOCK);
1908 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
1909 int dvhs_score= analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
1910 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
1911 score = FFMAX3(score, dvhs_score, fec_score);
1913 maxscore = FFMAX(maxscore, score);
1916 sumscore = sumscore*CHECK_COUNT/check_count;
1917 maxscore = maxscore*CHECK_COUNT/CHECK_BLOCK;
1919 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
1921 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
1922 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
1926 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1927 (-1) if not available */
1928 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1929 const uint8_t *packet)
1931 int afc, len, flags;
1935 afc = (packet[3] >> 4) & 3;
1945 if (!(flags & 0x10))
1950 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1951 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1955 static int mpegts_read_header(AVFormatContext *s)
1957 MpegTSContext *ts = s->priv_data;
1958 AVIOContext *pb = s->pb;
1959 uint8_t buf[8*1024]={0};
1963 /* read the first 8192 bytes to get packet size */
1964 pos = avio_tell(pb);
1965 len = avio_read(pb, buf, sizeof(buf));
1966 ts->raw_packet_size = get_packet_size(buf, len);
1967 if (ts->raw_packet_size <= 0) {
1968 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1969 ts->raw_packet_size = TS_PACKET_SIZE;
1974 if (s->iformat == &ff_mpegts_demuxer) {
1977 /* first do a scan to get all the services */
1978 /* NOTE: We attempt to seek on non-seekable files as well, as the
1979 * probe buffer usually is big enough. Only warn if the seek failed
1980 * on files where the seek should work. */
1981 if (avio_seek(pb, pos, SEEK_SET) < 0)
1982 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
1984 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1986 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1988 handle_packets(ts, s->probesize / ts->raw_packet_size);
1989 /* if could not find service, enable auto_guess */
1993 av_dlog(ts->stream, "tuning done\n");
1995 s->ctx_flags |= AVFMTCTX_NOHEADER;
1998 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1999 int64_t pcrs[2], pcr_h;
2000 int packet_count[2];
2001 uint8_t packet[TS_PACKET_SIZE];
2003 /* only read packets */
2005 st = avformat_new_stream(s, NULL);
2008 avpriv_set_pts_info(st, 60, 1, 27000000);
2009 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2010 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2012 /* we iterate until we find two PCRs to estimate the bitrate */
2017 ret = read_packet(s, packet, ts->raw_packet_size);
2020 pid = AV_RB16(packet + 1) & 0x1fff;
2021 if ((pcr_pid == -1 || pcr_pid == pid) &&
2022 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
2024 packet_count[nb_pcrs] = nb_packets;
2025 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2033 /* NOTE1: the bitrate is computed without the FEC */
2034 /* NOTE2: it is only the bitrate of the start of the stream */
2035 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2036 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2037 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
2038 st->codec->bit_rate = s->bit_rate;
2039 st->start_time = ts->cur_pcr;
2040 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2041 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2044 avio_seek(pb, pos, SEEK_SET);
2050 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2052 static int mpegts_raw_read_packet(AVFormatContext *s,
2055 MpegTSContext *ts = s->priv_data;
2057 int64_t pcr_h, next_pcr_h, pos;
2058 int pcr_l, next_pcr_l;
2059 uint8_t pcr_buf[12];
2061 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2062 return AVERROR(ENOMEM);
2063 pkt->pos= avio_tell(s->pb);
2064 ret = read_packet(s, pkt->data, ts->raw_packet_size);
2066 av_free_packet(pkt);
2069 if (ts->mpeg2ts_compute_pcr) {
2070 /* compute exact PCR for each packet */
2071 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2072 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2073 pos = avio_tell(s->pb);
2074 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
2075 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2076 avio_read(s->pb, pcr_buf, 12);
2077 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2078 /* XXX: not precise enough */
2079 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2084 avio_seek(s->pb, pos, SEEK_SET);
2085 /* no next PCR found: we use previous increment */
2086 ts->cur_pcr = pcr_h * 300 + pcr_l;
2088 pkt->pts = ts->cur_pcr;
2089 pkt->duration = ts->pcr_incr;
2090 ts->cur_pcr += ts->pcr_incr;
2092 pkt->stream_index = 0;
2096 static int mpegts_read_packet(AVFormatContext *s,
2099 MpegTSContext *ts = s->priv_data;
2104 ret = handle_packets(ts, 0);
2106 av_free_packet(ts->pkt);
2107 /* flush pes data left */
2108 for (i = 0; i < NB_PID_MAX; i++) {
2109 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2110 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2111 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2112 new_pes_packet(pes, pkt);
2113 pes->state = MPEGTS_SKIP;
2121 if (!ret && pkt->size < 0)
2122 ret = AVERROR(EINTR);
2126 static int mpegts_read_close(AVFormatContext *s)
2128 MpegTSContext *ts = s->priv_data;
2133 for(i=0;i<NB_PID_MAX;i++)
2134 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2139 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2140 int64_t *ppos, int64_t pos_limit)
2142 MpegTSContext *ts = s->priv_data;
2143 int64_t pos, timestamp;
2144 uint8_t buf[TS_PACKET_SIZE];
2145 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2146 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2147 while(pos < pos_limit) {
2148 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2149 return AV_NOPTS_VALUE;
2150 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2151 return AV_NOPTS_VALUE;
2152 if (buf[0] != 0x47) {
2153 if (mpegts_resync(s) < 0)
2154 return AV_NOPTS_VALUE;
2155 pos = avio_tell(s->pb);
2158 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2159 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2163 pos += ts->raw_packet_size;
2166 return AV_NOPTS_VALUE;
2169 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2170 int64_t *ppos, int64_t pos_limit)
2172 MpegTSContext *ts = s->priv_data;
2174 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2175 ff_read_frame_flush(s);
2176 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2177 return AV_NOPTS_VALUE;
2178 while(pos < pos_limit) {
2181 av_init_packet(&pkt);
2182 ret= av_read_frame(s, &pkt);
2184 return AV_NOPTS_VALUE;
2185 av_free_packet(&pkt);
2186 if(pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0){
2187 ff_reduce_index(s, pkt.stream_index);
2188 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2189 if(pkt.stream_index == stream_index){
2197 return AV_NOPTS_VALUE;
2200 /**************************************************************/
2201 /* parsing functions - called from other demuxers such as RTP */
2203 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2207 ts = av_mallocz(sizeof(MpegTSContext));
2210 /* no stream case, currently used by RTP */
2211 ts->raw_packet_size = TS_PACKET_SIZE;
2214 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2215 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2220 /* return the consumed length if a packet was output, or -1 if no
2222 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2223 const uint8_t *buf, int len)
2231 if (len < TS_PACKET_SIZE)
2233 if (buf[0] != 0x47) {
2237 handle_packet(ts, buf);
2238 buf += TS_PACKET_SIZE;
2239 len -= TS_PACKET_SIZE;
2240 if (ts->stop_parse == 1)
2247 void ff_mpegts_parse_close(MpegTSContext *ts)
2251 for(i=0;i<NB_PID_MAX;i++)
2252 av_free(ts->pids[i]);
2256 AVInputFormat ff_mpegts_demuxer = {
2258 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2259 .priv_data_size = sizeof(MpegTSContext),
2260 .read_probe = mpegts_probe,
2261 .read_header = mpegts_read_header,
2262 .read_packet = mpegts_read_packet,
2263 .read_close = mpegts_read_close,
2264 .read_timestamp = mpegts_get_dts,
2265 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2268 AVInputFormat ff_mpegtsraw_demuxer = {
2269 .name = "mpegtsraw",
2270 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2271 .priv_data_size = sizeof(MpegTSContext),
2272 .read_header = mpegts_read_header,
2273 .read_packet = mpegts_raw_read_packet,
2274 .read_close = mpegts_read_close,
2275 .read_timestamp = mpegts_get_dts,
2276 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2277 .priv_class = &mpegtsraw_class,