2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #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 "libavcodec/bytestream.h"
29 #include "libavcodec/get_bits.h"
33 #include "avio_internal.h"
38 /* maximum size in which we look for synchronisation if
39 synchronisation is lost */
40 #define MAX_RESYNC_SIZE 65536
42 #define MAX_PES_PAYLOAD 200*1024
44 #define MAX_MP4_DESCR_COUNT 16
46 enum MpegTSFilterType {
51 typedef struct MpegTSFilter MpegTSFilter;
53 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
55 typedef struct MpegTSPESFilter {
60 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
62 typedef void SetServiceCallback(void *opaque, int ret);
64 typedef struct MpegTSSectionFilter {
68 unsigned int check_crc:1;
69 unsigned int end_of_section_reached:1;
70 SectionCallback *section_cb;
72 } MpegTSSectionFilter;
77 int last_cc; /* last cc code (-1 if first packet) */
78 enum MpegTSFilterType type;
80 MpegTSPESFilter pes_filter;
81 MpegTSSectionFilter section_filter;
85 #define MAX_PIDS_PER_PROGRAM 64
87 unsigned int id; //program id/service id
89 unsigned int pids[MAX_PIDS_PER_PROGRAM];
92 struct MpegTSContext {
95 AVFormatContext *stream;
96 /** raw packet size, including FEC if present */
101 /** if true, all pids are analyzed to find streams */
104 /** compute exact PCR for each transport stream packet */
105 int mpeg2ts_compute_pcr;
107 int64_t cur_pcr; /**< used to estimate the exact PCR */
108 int pcr_incr; /**< used to estimate the exact PCR */
110 /* data needed to handle file based ts */
111 /** stop parsing loop */
113 /** packet containing Audio/Video data */
115 /** to detect seek */
118 /******************************************/
119 /* private mpegts data */
121 /** structure to keep track of Program->pids mapping */
126 /** filters for various streams specified by PMT + for the PAT and PMT */
127 MpegTSFilter *pids[NB_PID_MAX];
130 static const AVOption options[] = {
131 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
132 {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
136 static const AVClass mpegtsraw_class = {
137 .class_name = "mpegtsraw demuxer",
138 .item_name = av_default_item_name,
140 .version = LIBAVUTIL_VERSION_INT,
143 /* TS stream handling */
148 MPEGTS_PESHEADER_FILL,
153 /* enough for PES header + length */
154 #define PES_START_SIZE 6
155 #define PES_HEADER_SIZE 9
156 #define MAX_PES_HEADER_SIZE (9 + 255)
158 typedef struct PESContext {
160 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
163 AVFormatContext *stream;
165 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
166 enum MpegTSState state;
167 /* used to get the format */
169 int flags; /**< copied to the AVPacket flags */
172 int extended_stream_id;
174 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
175 uint8_t header[MAX_PES_HEADER_SIZE];
180 extern AVInputFormat ff_mpegts_demuxer;
182 static void clear_program(MpegTSContext *ts, unsigned int programid)
186 for(i=0; i<ts->nb_prg; i++)
187 if(ts->prg[i].id == programid)
188 ts->prg[i].nb_pids = 0;
191 static void clear_programs(MpegTSContext *ts)
197 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
200 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
204 p = &ts->prg[ts->nb_prg];
210 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
213 struct Program *p = NULL;
214 for(i=0; i<ts->nb_prg; i++) {
215 if(ts->prg[i].id == programid) {
223 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
225 p->pids[p->nb_pids++] = pid;
229 * @brief discard_pid() decides if the pid is to be discarded according
230 * to caller's programs selection
231 * @param ts : - TS context
233 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
236 static int discard_pid(MpegTSContext *ts, unsigned int pid)
239 int used = 0, discarded = 0;
241 for(i=0; i<ts->nb_prg; i++) {
243 for(j=0; j<p->nb_pids; j++) {
244 if(p->pids[j] != pid)
246 //is program with id p->id set to be discarded?
247 for(k=0; k<ts->stream->nb_programs; k++) {
248 if(ts->stream->programs[k]->id == p->id) {
249 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
258 return !used && discarded;
262 * Assemble PES packets out of TS packets, and then call the "section_cb"
263 * function when they are complete.
265 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
266 const uint8_t *buf, int buf_size, int is_start)
268 MpegTSSectionFilter *tss = &tss1->u.section_filter;
272 memcpy(tss->section_buf, buf, buf_size);
273 tss->section_index = buf_size;
274 tss->section_h_size = -1;
275 tss->end_of_section_reached = 0;
277 if (tss->end_of_section_reached)
279 len = 4096 - tss->section_index;
282 memcpy(tss->section_buf + tss->section_index, buf, len);
283 tss->section_index += len;
286 /* compute section length if possible */
287 if (tss->section_h_size == -1 && tss->section_index >= 3) {
288 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
291 tss->section_h_size = len;
294 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
295 tss->end_of_section_reached = 1;
296 if (!tss->check_crc ||
297 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
298 tss->section_buf, tss->section_h_size) == 0)
299 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
303 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
304 SectionCallback *section_cb, void *opaque,
308 MpegTSFilter *filter;
309 MpegTSSectionFilter *sec;
311 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
313 if (pid >= NB_PID_MAX || ts->pids[pid])
315 filter = av_mallocz(sizeof(MpegTSFilter));
318 ts->pids[pid] = filter;
319 filter->type = MPEGTS_SECTION;
322 filter->last_cc = -1;
323 sec = &filter->u.section_filter;
324 sec->section_cb = section_cb;
325 sec->opaque = opaque;
326 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
327 sec->check_crc = check_crc;
328 if (!sec->section_buf) {
335 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
339 MpegTSFilter *filter;
340 MpegTSPESFilter *pes;
342 if (pid >= NB_PID_MAX || ts->pids[pid])
344 filter = av_mallocz(sizeof(MpegTSFilter));
347 ts->pids[pid] = filter;
348 filter->type = MPEGTS_PES;
351 filter->last_cc = -1;
352 pes = &filter->u.pes_filter;
353 pes->pes_cb = pes_cb;
354 pes->opaque = opaque;
358 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
363 if (filter->type == MPEGTS_SECTION)
364 av_freep(&filter->u.section_filter.section_buf);
365 else if (filter->type == MPEGTS_PES) {
366 PESContext *pes = filter->u.pes_filter.opaque;
367 av_freep(&pes->buffer);
368 /* referenced private data will be freed later in
369 * avformat_close_input */
370 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
371 av_freep(&filter->u.pes_filter.opaque);
376 ts->pids[pid] = NULL;
379 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
380 int stat[TS_MAX_PACKET_SIZE];
385 memset(stat, 0, packet_size*sizeof(int));
387 for(x=i=0; i<size-3; i++){
388 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
390 if(stat[x] > best_score){
397 if(x == packet_size) x= 0;
403 /* autodetect fec presence. Must have at least 1024 bytes */
404 static int get_packet_size(const uint8_t *buf, int size)
406 int score, fec_score, dvhs_score;
408 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
411 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
412 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
413 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
414 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
415 score, dvhs_score, fec_score);
417 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
418 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
419 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
423 typedef struct SectionHeader {
428 uint8_t last_sec_num;
431 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
444 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
450 if ((p + 1) >= p_end)
458 /* read and allocate a DVB string preceded by its length */
459 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
466 len = get8(&p, p_end);
469 if ((p + len) > p_end)
471 str = av_malloc(len + 1);
481 static int parse_section_header(SectionHeader *h,
482 const uint8_t **pp, const uint8_t *p_end)
486 val = get8(pp, p_end);
491 val = get16(pp, p_end);
495 val = get8(pp, p_end);
498 h->version = (val >> 1) & 0x1f;
499 val = get8(pp, p_end);
503 val = get8(pp, p_end);
506 h->last_sec_num = val;
511 uint32_t stream_type;
512 enum AVMediaType codec_type;
513 enum AVCodecID codec_id;
516 static const StreamType ISO_types[] = {
517 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
518 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
519 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
520 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
521 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
522 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
523 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
524 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
525 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
526 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
530 static const StreamType HDMV_types[] = {
531 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
532 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
533 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
534 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
535 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
536 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
537 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
538 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
543 static const StreamType MISC_types[] = {
544 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
545 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
549 static const StreamType REGD_types[] = {
550 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
551 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
552 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
553 { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
554 { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
555 { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
556 { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
560 /* descriptor present */
561 static const StreamType DESC_types[] = {
562 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
563 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
564 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
565 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
566 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
570 static void mpegts_find_stream_type(AVStream *st,
571 uint32_t stream_type, const StreamType *types)
573 for (; types->stream_type; types++) {
574 if (stream_type == types->stream_type) {
575 st->codec->codec_type = types->codec_type;
576 st->codec->codec_id = types->codec_id;
582 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
583 uint32_t stream_type, uint32_t prog_reg_desc)
585 avpriv_set_pts_info(st, 33, 1, 90000);
587 st->codec->codec_type = AVMEDIA_TYPE_DATA;
588 st->codec->codec_id = AV_CODEC_ID_NONE;
589 st->need_parsing = AVSTREAM_PARSE_FULL;
591 pes->stream_type = stream_type;
593 av_log(pes->stream, AV_LOG_DEBUG,
594 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
595 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
597 st->codec->codec_tag = pes->stream_type;
599 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
600 if (prog_reg_desc == AV_RL32("HDMV") &&
601 st->codec->codec_id == AV_CODEC_ID_NONE) {
602 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
603 if (pes->stream_type == 0x83) {
604 // HDMV TrueHD streams also contain an AC3 coded version of the
605 // audio track - add a second stream for this
607 // priv_data cannot be shared between streams
608 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
610 return AVERROR(ENOMEM);
611 memcpy(sub_pes, pes, sizeof(*sub_pes));
613 sub_st = avformat_new_stream(pes->stream, NULL);
616 return AVERROR(ENOMEM);
619 sub_st->id = pes->pid;
620 avpriv_set_pts_info(sub_st, 33, 1, 90000);
621 sub_st->priv_data = sub_pes;
622 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
623 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
624 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
625 sub_pes->sub_st = pes->sub_st = sub_st;
628 if (st->codec->codec_id == AV_CODEC_ID_NONE)
629 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
634 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
638 pkt->destruct = av_destruct_packet;
639 pkt->data = pes->buffer;
640 pkt->size = pes->data_index;
642 if(pes->total_size != MAX_PES_PAYLOAD &&
643 pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
644 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
645 pes->flags |= AV_PKT_FLAG_CORRUPT;
647 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
649 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
650 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
651 pkt->stream_index = pes->sub_st->index;
653 pkt->stream_index = pes->st->index;
656 /* store position of first TS packet of this PES packet */
657 pkt->pos = pes->ts_packet_pos;
658 pkt->flags = pes->flags;
660 /* reset pts values */
661 pes->pts = AV_NOPTS_VALUE;
662 pes->dts = AV_NOPTS_VALUE;
668 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
671 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
672 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
673 int dts_flag = -1, cts_flag = -1;
674 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
675 init_get_bits(&gb, buf, buf_size*8);
677 if (sl->use_au_start)
678 au_start_flag = get_bits1(&gb);
680 au_end_flag = get_bits1(&gb);
681 if (!sl->use_au_start && !sl->use_au_end)
682 au_start_flag = au_end_flag = 1;
684 ocr_flag = get_bits1(&gb);
686 idle_flag = get_bits1(&gb);
688 padding_flag = get_bits1(&gb);
690 padding_bits = get_bits(&gb, 3);
692 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
693 if (sl->packet_seq_num_len)
694 skip_bits_long(&gb, sl->packet_seq_num_len);
695 if (sl->degr_prior_len)
697 skip_bits(&gb, sl->degr_prior_len);
699 skip_bits_long(&gb, sl->ocr_len);
701 if (sl->use_rand_acc_pt)
703 if (sl->au_seq_num_len > 0)
704 skip_bits_long(&gb, sl->au_seq_num_len);
705 if (sl->use_timestamps) {
706 dts_flag = get_bits1(&gb);
707 cts_flag = get_bits1(&gb);
710 if (sl->inst_bitrate_len)
711 inst_bitrate_flag = get_bits1(&gb);
713 dts = get_bits64(&gb, sl->timestamp_len);
715 cts = get_bits64(&gb, sl->timestamp_len);
717 skip_bits_long(&gb, sl->au_len);
718 if (inst_bitrate_flag)
719 skip_bits_long(&gb, sl->inst_bitrate_len);
722 if (dts != AV_NOPTS_VALUE)
724 if (cts != AV_NOPTS_VALUE)
727 if (sl->timestamp_len && sl->timestamp_res)
728 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
730 return (get_bits_count(&gb) + 7) >> 3;
733 /* return non zero if a packet could be constructed */
734 static int mpegts_push_data(MpegTSFilter *filter,
735 const uint8_t *buf, int buf_size, int is_start,
738 PESContext *pes = filter->u.pes_filter.opaque;
739 MpegTSContext *ts = pes->ts;
747 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
748 new_pes_packet(pes, ts->pkt);
751 pes->state = MPEGTS_HEADER;
753 pes->ts_packet_pos = pos;
756 while (buf_size > 0) {
759 len = PES_START_SIZE - pes->data_index;
762 memcpy(pes->header + pes->data_index, p, len);
763 pes->data_index += len;
766 if (pes->data_index == PES_START_SIZE) {
767 /* we got all the PES or section header. We can now
769 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
770 pes->header[2] == 0x01) {
771 /* it must be an mpeg2 PES stream */
772 code = pes->header[3] | 0x100;
773 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
775 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
776 (!pes->sub_st || pes->sub_st->discard == AVDISCARD_ALL)) ||
777 code == 0x1be) /* padding_stream */
780 /* stream not present in PMT */
782 pes->st = avformat_new_stream(ts->stream, NULL);
784 return AVERROR(ENOMEM);
785 pes->st->id = pes->pid;
786 mpegts_set_stream_info(pes->st, pes, 0, 0);
789 pes->total_size = AV_RB16(pes->header + 4);
790 /* NOTE: a zero total size means the PES size is
792 if (!pes->total_size)
793 pes->total_size = MAX_PES_PAYLOAD;
795 /* allocate pes buffer */
796 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
798 return AVERROR(ENOMEM);
800 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
801 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
802 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
803 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
804 pes->state = MPEGTS_PESHEADER;
805 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE) {
806 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
807 pes->pid, pes->stream_type);
808 pes->st->codec->codec_id = AV_CODEC_ID_PROBE;
811 pes->state = MPEGTS_PAYLOAD;
815 /* otherwise, it should be a table */
818 pes->state = MPEGTS_SKIP;
823 /**********************************************/
824 /* PES packing parsing */
825 case MPEGTS_PESHEADER:
826 len = PES_HEADER_SIZE - pes->data_index;
831 memcpy(pes->header + pes->data_index, p, len);
832 pes->data_index += len;
835 if (pes->data_index == PES_HEADER_SIZE) {
836 pes->pes_header_size = pes->header[8] + 9;
837 pes->state = MPEGTS_PESHEADER_FILL;
840 case MPEGTS_PESHEADER_FILL:
841 len = pes->pes_header_size - pes->data_index;
846 memcpy(pes->header + pes->data_index, p, len);
847 pes->data_index += len;
850 if (pes->data_index == pes->pes_header_size) {
852 unsigned int flags, pes_ext, skip;
854 flags = pes->header[7];
856 pes->pts = AV_NOPTS_VALUE;
857 pes->dts = AV_NOPTS_VALUE;
858 if ((flags & 0xc0) == 0x80) {
859 pes->dts = pes->pts = ff_parse_pes_pts(r);
861 } else if ((flags & 0xc0) == 0xc0) {
862 pes->pts = ff_parse_pes_pts(r);
864 pes->dts = ff_parse_pes_pts(r);
867 pes->extended_stream_id = -1;
868 if (flags & 0x01) { /* PES extension */
870 /* Skip PES private data, program packet sequence counter and P-STD buffer */
871 skip = (pes_ext >> 4) & 0xb;
874 if ((pes_ext & 0x41) == 0x01 &&
875 (r + 2) <= (pes->header + pes->pes_header_size)) {
876 /* PES extension 2 */
877 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
878 pes->extended_stream_id = r[1];
882 /* we got the full header. We parse it and get the payload */
883 pes->state = MPEGTS_PAYLOAD;
885 if (pes->stream_type == 0x12 && buf_size > 0) {
886 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
887 pes->pes_header_size += sl_header_bytes;
888 p += sl_header_bytes;
889 buf_size -= sl_header_bytes;
894 if (buf_size > 0 && pes->buffer) {
895 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
896 new_pes_packet(pes, ts->pkt);
897 pes->total_size = MAX_PES_PAYLOAD;
898 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
900 return AVERROR(ENOMEM);
902 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
903 // pes packet size is < ts size packet and pes data is padded with 0xff
904 // not sure if this is legal in ts but see issue #2392
905 buf_size = pes->total_size;
907 memcpy(pes->buffer+pes->data_index, p, buf_size);
908 pes->data_index += buf_size;
911 /* emit complete packets with known packet size
912 * decreases demuxer delay for infrequent packets like subtitles from
913 * a couple of seconds to milliseconds for properly muxed files.
914 * total_size is the number of bytes following pes_packet_length
915 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
916 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
917 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
919 new_pes_packet(pes, ts->pkt);
931 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
936 /* if no pid found, then add a pid context */
937 pes = av_mallocz(sizeof(PESContext));
941 pes->stream = ts->stream;
943 pes->pcr_pid = pcr_pid;
944 pes->state = MPEGTS_SKIP;
945 pes->pts = AV_NOPTS_VALUE;
946 pes->dts = AV_NOPTS_VALUE;
947 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
960 Mp4Descr *active_descr;
964 } MP4DescrParseContext;
966 static int init_MP4DescrParseContext(
967 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
968 unsigned size, Mp4Descr *descr, int max_descr_count)
972 return AVERROR_INVALIDDATA;
974 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
975 NULL, NULL, NULL, NULL)) < 0)
982 d->active_descr = NULL;
983 d->max_descr_count = max_descr_count;
988 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
989 int64_t new_off = avio_tell(pb);
990 (*len) -= new_off - *off;
994 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
997 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1000 if (parse_mp4_descr(d, off, len, 0) < 0)
1002 update_offsets(&d->pb, &off, &len);
1007 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1009 avio_rb16(&d->pb); // ID
1015 update_offsets(&d->pb, &off, &len);
1016 return parse_mp4_descr_arr(d, off, len);
1019 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1024 id_flags = avio_rb16(&d->pb);
1025 if (!(id_flags & 0x0020)) { //URL_Flag
1026 update_offsets(&d->pb, &off, &len);
1027 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1033 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1036 if (d->descr_count >= d->max_descr_count)
1038 ff_mp4_parse_es_descr(&d->pb, &es_id);
1039 d->active_descr = d->descr + (d->descr_count++);
1041 d->active_descr->es_id = es_id;
1042 update_offsets(&d->pb, &off, &len);
1043 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1044 update_offsets(&d->pb, &off, &len);
1046 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1047 d->active_descr = NULL;
1051 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1053 Mp4Descr *descr = d->active_descr;
1056 d->active_descr->dec_config_descr = av_malloc(len);
1057 if (!descr->dec_config_descr)
1058 return AVERROR(ENOMEM);
1059 descr->dec_config_descr_len = len;
1060 avio_read(&d->pb, descr->dec_config_descr, len);
1064 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1066 Mp4Descr *descr = d->active_descr;
1071 predefined = avio_r8(&d->pb);
1074 int flags = avio_r8(&d->pb);
1075 descr->sl.use_au_start = !!(flags & 0x80);
1076 descr->sl.use_au_end = !!(flags & 0x40);
1077 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1078 descr->sl.use_padding = !!(flags & 0x08);
1079 descr->sl.use_timestamps = !!(flags & 0x04);
1080 descr->sl.use_idle = !!(flags & 0x02);
1081 descr->sl.timestamp_res = avio_rb32(&d->pb);
1083 descr->sl.timestamp_len = avio_r8(&d->pb);
1084 descr->sl.ocr_len = avio_r8(&d->pb);
1085 descr->sl.au_len = avio_r8(&d->pb);
1086 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1087 lengths = avio_rb16(&d->pb);
1088 descr->sl.degr_prior_len = lengths >> 12;
1089 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1090 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1092 av_log_missing_feature(d->s, "Predefined SLConfigDescriptor\n", 0);
1097 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1100 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1101 update_offsets(&d->pb, &off, &len);
1102 if (len < 0 || len1 > len || len1 <= 0) {
1103 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1107 if (d->level++ >= MAX_LEVEL) {
1108 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1112 if (target_tag && tag != target_tag) {
1113 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1119 parse_MP4IODescrTag(d, off, len1);
1122 parse_MP4ODescrTag(d, off, len1);
1125 parse_MP4ESDescrTag(d, off, len1);
1127 case MP4DecConfigDescrTag:
1128 parse_MP4DecConfigDescrTag(d, off, len1);
1131 parse_MP4SLDescrTag(d, off, len1);
1137 avio_seek(&d->pb, off + len1, SEEK_SET);
1141 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1142 Mp4Descr *descr, int *descr_count, int max_descr_count)
1144 MP4DescrParseContext d;
1145 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1148 parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1150 *descr_count = d.descr_count;
1154 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1155 Mp4Descr *descr, int *descr_count, int max_descr_count)
1157 MP4DescrParseContext d;
1158 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1161 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1163 *descr_count = d.descr_count;
1167 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1169 MpegTSContext *ts = filter->u.section_filter.opaque;
1171 const uint8_t *p, *p_end;
1173 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1174 int mp4_descr_count = 0;
1176 AVFormatContext *s = ts->stream;
1178 p_end = section + section_len - 4;
1180 if (parse_section_header(&h, &p, p_end) < 0)
1182 if (h.tid != M4OD_TID)
1185 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1187 for (pid = 0; pid < NB_PID_MAX; pid++) {
1190 for (i = 0; i < mp4_descr_count; i++) {
1193 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1195 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1196 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1199 pes = ts->pids[pid]->u.pes_filter.opaque;
1205 pes->sl = mp4_descr[i].sl;
1207 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1208 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1209 ff_mp4_read_dec_config_descr(s, st, &pb);
1210 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1211 st->codec->extradata_size > 0)
1212 st->need_parsing = 0;
1213 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1214 st->codec->extradata_size > 0)
1215 st->need_parsing = 0;
1217 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1218 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO) {
1219 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1220 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE) {
1221 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1222 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN) {
1223 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1227 for (i = 0; i < mp4_descr_count; i++)
1228 av_free(mp4_descr[i].dec_config_descr);
1231 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1232 const uint8_t **pp, const uint8_t *desc_list_end,
1233 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1236 const uint8_t *desc_end;
1237 int desc_len, desc_tag, desc_es_id;
1241 desc_tag = get8(pp, desc_list_end);
1244 desc_len = get8(pp, desc_list_end);
1247 desc_end = *pp + desc_len;
1248 if (desc_end > desc_list_end)
1251 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1253 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1254 stream_type == STREAM_TYPE_PRIVATE_DATA)
1255 mpegts_find_stream_type(st, desc_tag, DESC_types);
1258 case 0x1E: /* SL descriptor */
1259 desc_es_id = get16(pp, desc_end);
1260 if (ts && ts->pids[pid])
1261 ts->pids[pid]->es_id = desc_es_id;
1262 for (i = 0; i < mp4_descr_count; i++)
1263 if (mp4_descr[i].dec_config_descr_len &&
1264 mp4_descr[i].es_id == desc_es_id) {
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(fc, 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_MPEG4SYSTEMS)
1273 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1276 case 0x1F: /* FMC descriptor */
1277 get16(pp, desc_end);
1278 if (mp4_descr_count > 0 && st->codec->codec_id == AV_CODEC_ID_AAC_LATM &&
1279 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1281 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1282 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1283 ff_mp4_read_dec_config_descr(fc, st, &pb);
1284 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1285 st->codec->extradata_size > 0)
1286 st->need_parsing = 0;
1289 case 0x56: /* DVB teletext descriptor */
1290 language[0] = get8(pp, desc_end);
1291 language[1] = get8(pp, desc_end);
1292 language[2] = get8(pp, desc_end);
1294 av_dict_set(&st->metadata, "language", language, 0);
1296 case 0x59: /* subtitling descriptor */
1297 language[0] = get8(pp, desc_end);
1298 language[1] = get8(pp, desc_end);
1299 language[2] = get8(pp, desc_end);
1301 /* hearing impaired subtitles detection */
1302 switch(get8(pp, desc_end)) {
1303 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1304 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1305 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1306 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1307 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1308 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1309 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1312 if (st->codec->extradata) {
1313 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1314 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1316 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1317 if (st->codec->extradata) {
1318 st->codec->extradata_size = 4;
1319 memcpy(st->codec->extradata, *pp, 4);
1323 av_dict_set(&st->metadata, "language", language, 0);
1325 case 0x0a: /* ISO 639 language descriptor */
1326 for (i = 0; i + 4 <= desc_len; i += 4) {
1327 language[i + 0] = get8(pp, desc_end);
1328 language[i + 1] = get8(pp, desc_end);
1329 language[i + 2] = get8(pp, desc_end);
1330 language[i + 3] = ',';
1331 switch (get8(pp, desc_end)) {
1332 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1333 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1334 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1338 language[i - 1] = 0;
1339 av_dict_set(&st->metadata, "language", language, 0);
1342 case 0x05: /* registration descriptor */
1343 st->codec->codec_tag = bytestream_get_le32(pp);
1344 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1345 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1346 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1355 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1357 MpegTSContext *ts = filter->u.section_filter.opaque;
1358 SectionHeader h1, *h = &h1;
1361 const uint8_t *p, *p_end, *desc_list_end;
1362 int program_info_length, pcr_pid, pid, stream_type;
1364 uint32_t prog_reg_desc = 0; /* registration descriptor */
1366 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1367 int mp4_descr_count = 0;
1370 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1371 hex_dump_debug(ts->stream, section, section_len);
1373 p_end = section + section_len - 4;
1375 if (parse_section_header(h, &p, p_end) < 0)
1378 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1379 h->id, h->sec_num, h->last_sec_num);
1381 if (h->tid != PMT_TID)
1384 clear_program(ts, h->id);
1385 pcr_pid = get16(&p, p_end);
1389 add_pid_to_pmt(ts, h->id, pcr_pid);
1391 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1393 program_info_length = get16(&p, p_end);
1394 if (program_info_length < 0)
1396 program_info_length &= 0xfff;
1397 while(program_info_length >= 2) {
1399 tag = get8(&p, p_end);
1400 len = get8(&p, p_end);
1402 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1404 if(len > program_info_length - 2)
1405 //something else is broken, exit the program_descriptors_loop
1407 program_info_length -= len + 2;
1408 if (tag == 0x1d) { // IOD descriptor
1409 get8(&p, p_end); // scope
1410 get8(&p, p_end); // label
1412 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1413 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1414 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1415 prog_reg_desc = bytestream_get_le32(&p);
1420 p += program_info_length;
1424 // stop parsing after pmt, we found header
1425 if (!ts->stream->nb_streams)
1431 stream_type = get8(&p, p_end);
1432 if (stream_type < 0)
1434 pid = get16(&p, p_end);
1439 /* now create stream */
1440 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1441 pes = ts->pids[pid]->u.pes_filter.opaque;
1443 pes->st = avformat_new_stream(pes->stream, NULL);
1444 pes->st->id = pes->pid;
1447 } else if (stream_type != 0x13) {
1448 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1449 pes = add_pes_stream(ts, pid, pcr_pid);
1451 st = avformat_new_stream(pes->stream, NULL);
1455 int idx = ff_find_stream_index(ts->stream, pid);
1457 st = ts->stream->streams[idx];
1459 st = avformat_new_stream(ts->stream, NULL);
1461 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1468 if (pes && !pes->stream_type)
1469 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1471 add_pid_to_pmt(ts, h->id, pid);
1473 ff_program_add_stream_index(ts->stream, h->id, st->index);
1475 desc_list_len = get16(&p, p_end);
1476 if (desc_list_len < 0)
1478 desc_list_len &= 0xfff;
1479 desc_list_end = p + desc_list_len;
1480 if (desc_list_end > p_end)
1483 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1484 mp4_descr, mp4_descr_count, pid, ts) < 0)
1487 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1488 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1489 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1496 for (i = 0; i < mp4_descr_count; i++)
1497 av_free(mp4_descr[i].dec_config_descr);
1500 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1502 MpegTSContext *ts = filter->u.section_filter.opaque;
1503 SectionHeader h1, *h = &h1;
1504 const uint8_t *p, *p_end;
1507 av_dlog(ts->stream, "PAT:\n");
1508 hex_dump_debug(ts->stream, section, section_len);
1510 p_end = section + section_len - 4;
1512 if (parse_section_header(h, &p, p_end) < 0)
1514 if (h->tid != PAT_TID)
1519 sid = get16(&p, p_end);
1522 pmt_pid = get16(&p, p_end);
1527 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1529 if (sid == 0x0000) {
1532 av_new_program(ts->stream, sid);
1533 if (ts->pids[pmt_pid])
1534 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1535 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1536 add_pat_entry(ts, sid);
1537 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1538 add_pid_to_pmt(ts, sid, pmt_pid);
1543 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1545 MpegTSContext *ts = filter->u.section_filter.opaque;
1546 SectionHeader h1, *h = &h1;
1547 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1548 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1549 char *name, *provider_name;
1551 av_dlog(ts->stream, "SDT:\n");
1552 hex_dump_debug(ts->stream, section, section_len);
1554 p_end = section + section_len - 4;
1556 if (parse_section_header(h, &p, p_end) < 0)
1558 if (h->tid != SDT_TID)
1560 onid = get16(&p, p_end);
1563 val = get8(&p, p_end);
1567 sid = get16(&p, p_end);
1570 val = get8(&p, p_end);
1573 desc_list_len = get16(&p, p_end);
1574 if (desc_list_len < 0)
1576 desc_list_len &= 0xfff;
1577 desc_list_end = p + desc_list_len;
1578 if (desc_list_end > p_end)
1581 desc_tag = get8(&p, desc_list_end);
1584 desc_len = get8(&p, desc_list_end);
1585 desc_end = p + desc_len;
1586 if (desc_end > desc_list_end)
1589 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1590 desc_tag, desc_len);
1594 service_type = get8(&p, p_end);
1595 if (service_type < 0)
1597 provider_name = getstr8(&p, p_end);
1600 name = getstr8(&p, p_end);
1602 AVProgram *program = av_new_program(ts->stream, sid);
1604 av_dict_set(&program->metadata, "service_name", name, 0);
1605 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1609 av_free(provider_name);
1620 /* handle one TS packet */
1621 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1623 AVFormatContext *s = ts->stream;
1625 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1626 has_adaptation, has_payload;
1627 const uint8_t *p, *p_end;
1630 pid = AV_RB16(packet + 1) & 0x1fff;
1631 if(pid && discard_pid(ts, pid))
1633 is_start = packet[1] & 0x40;
1634 tss = ts->pids[pid];
1635 if (ts->auto_guess && tss == NULL && is_start) {
1636 add_pes_stream(ts, pid, -1);
1637 tss = ts->pids[pid];
1642 afc = (packet[3] >> 4) & 3;
1643 if (afc == 0) /* reserved value */
1645 has_adaptation = afc & 2;
1646 has_payload = afc & 1;
1647 is_discontinuity = has_adaptation
1648 && packet[4] != 0 /* with length > 0 */
1649 && (packet[5] & 0x80); /* and discontinuity indicated */
1651 /* continuity check (currently not used) */
1652 cc = (packet[3] & 0xf);
1653 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1654 cc_ok = pid == 0x1FFF // null packet PID
1657 || expected_cc == cc;
1661 av_log(ts->stream, AV_LOG_WARNING,
1662 "Continuity check failed for pid %d expected %d got %d\n",
1663 pid, expected_cc, cc);
1664 if(tss->type == MPEGTS_PES) {
1665 PESContext *pc = tss->u.pes_filter.opaque;
1666 pc->flags |= AV_PKT_FLAG_CORRUPT;
1673 if (has_adaptation) {
1674 /* skip adaptation field */
1677 /* if past the end of packet, ignore */
1678 p_end = packet + TS_PACKET_SIZE;
1682 pos = avio_tell(ts->stream->pb);
1683 ts->pos47= pos % ts->raw_packet_size;
1685 if (tss->type == MPEGTS_SECTION) {
1687 /* pointer field present */
1689 if (p + len > p_end)
1692 /* write remaining section bytes */
1693 write_section_data(s, tss,
1695 /* check whether filter has been closed */
1701 write_section_data(s, tss,
1706 write_section_data(s, tss,
1712 // Note: The position here points actually behind the current packet.
1713 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1714 pos - ts->raw_packet_size)) < 0)
1721 /* XXX: try to find a better synchro over several packets (use
1722 get_packet_size() ?) */
1723 static int mpegts_resync(AVFormatContext *s)
1725 AVIOContext *pb = s->pb;
1728 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1730 if (pb->eof_reached)
1733 avio_seek(pb, -1, SEEK_CUR);
1737 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1742 /* return -1 if error or EOF. Return 0 if OK. */
1743 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1745 AVIOContext *pb = s->pb;
1749 len = avio_read(pb, buf, TS_PACKET_SIZE);
1750 if (len != TS_PACKET_SIZE)
1751 return len < 0 ? len : AVERROR_EOF;
1752 /* check packet sync byte */
1753 if (buf[0] != 0x47) {
1754 /* find a new packet start */
1755 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1756 if (mpegts_resync(s) < 0)
1757 return AVERROR(EAGAIN);
1761 skip = raw_packet_size - TS_PACKET_SIZE;
1763 avio_skip(pb, skip);
1770 static int handle_packets(MpegTSContext *ts, int nb_packets)
1772 AVFormatContext *s = ts->stream;
1773 uint8_t packet[TS_PACKET_SIZE+FF_INPUT_BUFFER_PADDING_SIZE];
1774 int packet_num, ret = 0;
1776 if (avio_tell(s->pb) != ts->last_pos) {
1778 av_dlog(ts->stream, "Skipping after seek\n");
1779 /* seek detected, flush pes buffer */
1780 for (i = 0; i < NB_PID_MAX; i++) {
1782 if (ts->pids[i]->type == MPEGTS_PES) {
1783 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1784 av_freep(&pes->buffer);
1785 pes->data_index = 0;
1786 pes->state = MPEGTS_SKIP; /* skip until pes header */
1788 ts->pids[i]->last_cc = -1;
1795 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1797 if (ts->stop_parse>0)
1800 if (nb_packets != 0 && packet_num >= nb_packets)
1802 ret = read_packet(s, packet, ts->raw_packet_size);
1805 ret = handle_packet(ts, packet);
1809 ts->last_pos = avio_tell(s->pb);
1813 static int mpegts_probe(AVProbeData *p)
1815 const int size= p->buf_size;
1816 int score, fec_score, dvhs_score;
1817 int check_count= size / TS_FEC_PACKET_SIZE;
1818 #define CHECK_COUNT 10
1820 if (check_count < CHECK_COUNT)
1823 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1824 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1825 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1826 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
1827 score, dvhs_score, fec_score);
1829 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1830 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1831 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1832 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1836 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1837 (-1) if not available */
1838 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1839 const uint8_t *packet)
1841 int afc, len, flags;
1845 afc = (packet[3] >> 4) & 3;
1855 if (!(flags & 0x10))
1860 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1861 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1865 static int mpegts_read_header(AVFormatContext *s)
1867 MpegTSContext *ts = s->priv_data;
1868 AVIOContext *pb = s->pb;
1869 uint8_t buf[5*1024];
1873 /* read the first 1024 bytes to get packet size */
1874 pos = avio_tell(pb);
1875 len = avio_read(pb, buf, sizeof(buf));
1876 if (len != sizeof(buf))
1878 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1879 if (ts->raw_packet_size <= 0)
1884 if (s->iformat == &ff_mpegts_demuxer) {
1887 /* first do a scan to get all the services */
1888 if (avio_seek(pb, pos, SEEK_SET) < 0 && pb->seekable)
1889 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1891 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1893 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1895 handle_packets(ts, s->probesize / ts->raw_packet_size);
1896 /* if could not find service, enable auto_guess */
1900 av_dlog(ts->stream, "tuning done\n");
1902 s->ctx_flags |= AVFMTCTX_NOHEADER;
1905 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1906 int64_t pcrs[2], pcr_h;
1907 int packet_count[2];
1908 uint8_t packet[TS_PACKET_SIZE];
1910 /* only read packets */
1912 st = avformat_new_stream(s, NULL);
1915 avpriv_set_pts_info(st, 60, 1, 27000000);
1916 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1917 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
1919 /* we iterate until we find two PCRs to estimate the bitrate */
1924 ret = read_packet(s, packet, ts->raw_packet_size);
1927 pid = AV_RB16(packet + 1) & 0x1fff;
1928 if ((pcr_pid == -1 || pcr_pid == pid) &&
1929 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1931 packet_count[nb_pcrs] = nb_packets;
1932 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1940 /* NOTE1: the bitrate is computed without the FEC */
1941 /* NOTE2: it is only the bitrate of the start of the stream */
1942 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1943 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1944 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1945 st->codec->bit_rate = s->bit_rate;
1946 st->start_time = ts->cur_pcr;
1947 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1948 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1951 avio_seek(pb, pos, SEEK_SET);
1957 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1959 static int mpegts_raw_read_packet(AVFormatContext *s,
1962 MpegTSContext *ts = s->priv_data;
1964 int64_t pcr_h, next_pcr_h, pos;
1965 int pcr_l, next_pcr_l;
1966 uint8_t pcr_buf[12];
1968 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1969 return AVERROR(ENOMEM);
1970 pkt->pos= avio_tell(s->pb);
1971 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1973 av_free_packet(pkt);
1976 if (ts->mpeg2ts_compute_pcr) {
1977 /* compute exact PCR for each packet */
1978 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1979 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1980 pos = avio_tell(s->pb);
1981 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1982 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1983 avio_read(s->pb, pcr_buf, 12);
1984 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1985 /* XXX: not precise enough */
1986 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1991 avio_seek(s->pb, pos, SEEK_SET);
1992 /* no next PCR found: we use previous increment */
1993 ts->cur_pcr = pcr_h * 300 + pcr_l;
1995 pkt->pts = ts->cur_pcr;
1996 pkt->duration = ts->pcr_incr;
1997 ts->cur_pcr += ts->pcr_incr;
1999 pkt->stream_index = 0;
2003 static int mpegts_read_packet(AVFormatContext *s,
2006 MpegTSContext *ts = s->priv_data;
2011 ret = handle_packets(ts, 0);
2013 /* flush pes data left */
2014 for (i = 0; i < NB_PID_MAX; i++) {
2015 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2016 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2017 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2018 new_pes_packet(pes, pkt);
2019 pes->state = MPEGTS_SKIP;
2027 if (!ret && pkt->size < 0)
2028 ret = AVERROR(EINTR);
2032 static int mpegts_read_close(AVFormatContext *s)
2034 MpegTSContext *ts = s->priv_data;
2039 for(i=0;i<NB_PID_MAX;i++)
2040 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2045 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2046 int64_t *ppos, int64_t pos_limit)
2048 MpegTSContext *ts = s->priv_data;
2049 int64_t pos, timestamp;
2050 uint8_t buf[TS_PACKET_SIZE];
2051 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2052 const int find_next= 1;
2053 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2056 avio_seek(s->pb, pos, SEEK_SET);
2057 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2058 return AV_NOPTS_VALUE;
2059 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2060 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2063 pos += ts->raw_packet_size;
2067 pos -= ts->raw_packet_size;
2069 return AV_NOPTS_VALUE;
2070 avio_seek(s->pb, pos, SEEK_SET);
2071 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2072 return AV_NOPTS_VALUE;
2073 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2074 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2084 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
2085 MpegTSContext *ts = s->priv_data;
2086 uint8_t buf[TS_PACKET_SIZE];
2089 if (ff_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
2092 pos= avio_tell(s->pb);
2095 avio_seek(s->pb, pos, SEEK_SET);
2096 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2098 // pid = AV_RB16(buf + 1) & 0x1fff;
2099 if(buf[1] & 0x40) break;
2100 pos += ts->raw_packet_size;
2102 avio_seek(s->pb, pos, SEEK_SET);
2107 /**************************************************************/
2108 /* parsing functions - called from other demuxers such as RTP */
2110 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2114 ts = av_mallocz(sizeof(MpegTSContext));
2117 /* no stream case, currently used by RTP */
2118 ts->raw_packet_size = TS_PACKET_SIZE;
2124 /* return the consumed length if a packet was output, or -1 if no
2126 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2127 const uint8_t *buf, int len)
2135 if (ts->stop_parse>0)
2137 if (len < TS_PACKET_SIZE)
2139 if (buf[0] != 0x47) {
2143 handle_packet(ts, buf);
2144 buf += TS_PACKET_SIZE;
2145 len -= TS_PACKET_SIZE;
2151 void ff_mpegts_parse_close(MpegTSContext *ts)
2155 for(i=0;i<NB_PID_MAX;i++)
2156 av_free(ts->pids[i]);
2160 AVInputFormat ff_mpegts_demuxer = {
2162 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2163 .priv_data_size = sizeof(MpegTSContext),
2164 .read_probe = mpegts_probe,
2165 .read_header = mpegts_read_header,
2166 .read_packet = mpegts_read_packet,
2167 .read_close = mpegts_read_close,
2168 .read_seek = read_seek,
2169 .read_timestamp = mpegts_get_pcr,
2170 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2173 AVInputFormat ff_mpegtsraw_demuxer = {
2174 .name = "mpegtsraw",
2175 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2176 .priv_data_size = sizeof(MpegTSContext),
2177 .read_header = mpegts_read_header,
2178 .read_packet = mpegts_raw_read_packet,
2179 .read_close = mpegts_read_close,
2180 .read_seek = read_seek,
2181 .read_timestamp = mpegts_get_pcr,
2182 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2183 .priv_class = &mpegtsraw_class,