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 uint64_t get_bits64(GetBitContext *gb, int bits)
673 ret |= get_bits(gb, 17);
677 ret |= get_bits(gb, bits);
681 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
684 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
685 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
686 int dts_flag = -1, cts_flag = -1;
687 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
688 init_get_bits(&gb, buf, buf_size*8);
690 if (sl->use_au_start)
691 au_start_flag = get_bits1(&gb);
693 au_end_flag = get_bits1(&gb);
694 if (!sl->use_au_start && !sl->use_au_end)
695 au_start_flag = au_end_flag = 1;
697 ocr_flag = get_bits1(&gb);
699 idle_flag = get_bits1(&gb);
701 padding_flag = get_bits1(&gb);
703 padding_bits = get_bits(&gb, 3);
705 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
706 if (sl->packet_seq_num_len)
707 skip_bits_long(&gb, sl->packet_seq_num_len);
708 if (sl->degr_prior_len)
710 skip_bits(&gb, sl->degr_prior_len);
712 skip_bits_long(&gb, sl->ocr_len);
714 if (sl->use_rand_acc_pt)
716 if (sl->au_seq_num_len > 0)
717 skip_bits_long(&gb, sl->au_seq_num_len);
718 if (sl->use_timestamps) {
719 dts_flag = get_bits1(&gb);
720 cts_flag = get_bits1(&gb);
723 if (sl->inst_bitrate_len)
724 inst_bitrate_flag = get_bits1(&gb);
726 dts = get_bits64(&gb, sl->timestamp_len);
728 cts = get_bits64(&gb, sl->timestamp_len);
730 skip_bits_long(&gb, sl->au_len);
731 if (inst_bitrate_flag)
732 skip_bits_long(&gb, sl->inst_bitrate_len);
735 if (dts != AV_NOPTS_VALUE)
737 if (cts != AV_NOPTS_VALUE)
740 if (sl->timestamp_len && sl->timestamp_res)
741 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
743 return (get_bits_count(&gb) + 7) >> 3;
746 /* return non zero if a packet could be constructed */
747 static int mpegts_push_data(MpegTSFilter *filter,
748 const uint8_t *buf, int buf_size, int is_start,
751 PESContext *pes = filter->u.pes_filter.opaque;
752 MpegTSContext *ts = pes->ts;
760 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
761 new_pes_packet(pes, ts->pkt);
764 pes->state = MPEGTS_HEADER;
766 pes->ts_packet_pos = pos;
769 while (buf_size > 0) {
772 len = PES_START_SIZE - pes->data_index;
775 memcpy(pes->header + pes->data_index, p, len);
776 pes->data_index += len;
779 if (pes->data_index == PES_START_SIZE) {
780 /* we got all the PES or section header. We can now
782 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
783 pes->header[2] == 0x01) {
784 /* it must be an mpeg2 PES stream */
785 code = pes->header[3] | 0x100;
786 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
788 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
789 (!pes->sub_st || pes->sub_st->discard == AVDISCARD_ALL)) ||
790 code == 0x1be) /* padding_stream */
793 /* stream not present in PMT */
795 pes->st = avformat_new_stream(ts->stream, NULL);
797 return AVERROR(ENOMEM);
798 pes->st->id = pes->pid;
799 mpegts_set_stream_info(pes->st, pes, 0, 0);
802 pes->total_size = AV_RB16(pes->header + 4);
803 /* NOTE: a zero total size means the PES size is
805 if (!pes->total_size)
806 pes->total_size = MAX_PES_PAYLOAD;
808 /* allocate pes buffer */
809 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
811 return AVERROR(ENOMEM);
813 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
814 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
815 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
816 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
817 pes->state = MPEGTS_PESHEADER;
818 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE) {
819 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
820 pes->pid, pes->stream_type);
821 pes->st->codec->codec_id = AV_CODEC_ID_PROBE;
824 pes->state = MPEGTS_PAYLOAD;
828 /* otherwise, it should be a table */
831 pes->state = MPEGTS_SKIP;
836 /**********************************************/
837 /* PES packing parsing */
838 case MPEGTS_PESHEADER:
839 len = PES_HEADER_SIZE - pes->data_index;
844 memcpy(pes->header + pes->data_index, p, len);
845 pes->data_index += len;
848 if (pes->data_index == PES_HEADER_SIZE) {
849 pes->pes_header_size = pes->header[8] + 9;
850 pes->state = MPEGTS_PESHEADER_FILL;
853 case MPEGTS_PESHEADER_FILL:
854 len = pes->pes_header_size - pes->data_index;
859 memcpy(pes->header + pes->data_index, p, len);
860 pes->data_index += len;
863 if (pes->data_index == pes->pes_header_size) {
865 unsigned int flags, pes_ext, skip;
867 flags = pes->header[7];
869 pes->pts = AV_NOPTS_VALUE;
870 pes->dts = AV_NOPTS_VALUE;
871 if ((flags & 0xc0) == 0x80) {
872 pes->dts = pes->pts = ff_parse_pes_pts(r);
874 } else if ((flags & 0xc0) == 0xc0) {
875 pes->pts = ff_parse_pes_pts(r);
877 pes->dts = ff_parse_pes_pts(r);
880 pes->extended_stream_id = -1;
881 if (flags & 0x01) { /* PES extension */
883 /* Skip PES private data, program packet sequence counter and P-STD buffer */
884 skip = (pes_ext >> 4) & 0xb;
887 if ((pes_ext & 0x41) == 0x01 &&
888 (r + 2) <= (pes->header + pes->pes_header_size)) {
889 /* PES extension 2 */
890 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
891 pes->extended_stream_id = r[1];
895 /* we got the full header. We parse it and get the payload */
896 pes->state = MPEGTS_PAYLOAD;
898 if (pes->stream_type == 0x12 && buf_size > 0) {
899 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
900 pes->pes_header_size += sl_header_bytes;
901 p += sl_header_bytes;
902 buf_size -= sl_header_bytes;
907 if (buf_size > 0 && pes->buffer) {
908 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
909 new_pes_packet(pes, ts->pkt);
910 pes->total_size = MAX_PES_PAYLOAD;
911 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
913 return AVERROR(ENOMEM);
915 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
916 // pes packet size is < ts size packet and pes data is padded with 0xff
917 // not sure if this is legal in ts but see issue #2392
918 buf_size = pes->total_size;
920 memcpy(pes->buffer+pes->data_index, p, buf_size);
921 pes->data_index += buf_size;
924 /* emit complete packets with known packet size
925 * decreases demuxer delay for infrequent packets like subtitles from
926 * a couple of seconds to milliseconds for properly muxed files.
927 * total_size is the number of bytes following pes_packet_length
928 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
929 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
930 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
932 new_pes_packet(pes, ts->pkt);
944 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
949 /* if no pid found, then add a pid context */
950 pes = av_mallocz(sizeof(PESContext));
954 pes->stream = ts->stream;
956 pes->pcr_pid = pcr_pid;
957 pes->state = MPEGTS_SKIP;
958 pes->pts = AV_NOPTS_VALUE;
959 pes->dts = AV_NOPTS_VALUE;
960 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
973 Mp4Descr *active_descr;
977 } MP4DescrParseContext;
979 static int init_MP4DescrParseContext(
980 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
981 unsigned size, Mp4Descr *descr, int max_descr_count)
985 return AVERROR_INVALIDDATA;
987 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
988 NULL, NULL, NULL, NULL)) < 0)
995 d->active_descr = NULL;
996 d->max_descr_count = max_descr_count;
1001 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
1002 int64_t new_off = avio_tell(pb);
1003 (*len) -= new_off - *off;
1007 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1010 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1013 if (parse_mp4_descr(d, off, len, 0) < 0)
1015 update_offsets(&d->pb, &off, &len);
1020 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1022 avio_rb16(&d->pb); // ID
1028 update_offsets(&d->pb, &off, &len);
1029 return parse_mp4_descr_arr(d, off, len);
1032 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1037 id_flags = avio_rb16(&d->pb);
1038 if (!(id_flags & 0x0020)) { //URL_Flag
1039 update_offsets(&d->pb, &off, &len);
1040 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1046 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1049 if (d->descr_count >= d->max_descr_count)
1051 ff_mp4_parse_es_descr(&d->pb, &es_id);
1052 d->active_descr = d->descr + (d->descr_count++);
1054 d->active_descr->es_id = es_id;
1055 update_offsets(&d->pb, &off, &len);
1056 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1057 update_offsets(&d->pb, &off, &len);
1059 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1060 d->active_descr = NULL;
1064 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1066 Mp4Descr *descr = d->active_descr;
1069 d->active_descr->dec_config_descr = av_malloc(len);
1070 if (!descr->dec_config_descr)
1071 return AVERROR(ENOMEM);
1072 descr->dec_config_descr_len = len;
1073 avio_read(&d->pb, descr->dec_config_descr, len);
1077 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1079 Mp4Descr *descr = d->active_descr;
1084 predefined = avio_r8(&d->pb);
1087 int flags = avio_r8(&d->pb);
1088 descr->sl.use_au_start = !!(flags & 0x80);
1089 descr->sl.use_au_end = !!(flags & 0x40);
1090 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1091 descr->sl.use_padding = !!(flags & 0x08);
1092 descr->sl.use_timestamps = !!(flags & 0x04);
1093 descr->sl.use_idle = !!(flags & 0x02);
1094 descr->sl.timestamp_res = avio_rb32(&d->pb);
1096 descr->sl.timestamp_len = avio_r8(&d->pb);
1097 descr->sl.ocr_len = avio_r8(&d->pb);
1098 descr->sl.au_len = avio_r8(&d->pb);
1099 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1100 lengths = avio_rb16(&d->pb);
1101 descr->sl.degr_prior_len = lengths >> 12;
1102 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1103 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1105 av_log_missing_feature(d->s, "Predefined SLConfigDescriptor\n", 0);
1110 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1113 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1114 update_offsets(&d->pb, &off, &len);
1115 if (len < 0 || len1 > len || len1 <= 0) {
1116 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1120 if (d->level++ >= MAX_LEVEL) {
1121 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1125 if (target_tag && tag != target_tag) {
1126 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1132 parse_MP4IODescrTag(d, off, len1);
1135 parse_MP4ODescrTag(d, off, len1);
1138 parse_MP4ESDescrTag(d, off, len1);
1140 case MP4DecConfigDescrTag:
1141 parse_MP4DecConfigDescrTag(d, off, len1);
1144 parse_MP4SLDescrTag(d, off, len1);
1150 avio_seek(&d->pb, off + len1, SEEK_SET);
1154 static int mp4_read_iods(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(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1163 *descr_count = d.descr_count;
1167 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1168 Mp4Descr *descr, int *descr_count, int max_descr_count)
1170 MP4DescrParseContext d;
1171 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1174 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1176 *descr_count = d.descr_count;
1180 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1182 MpegTSContext *ts = filter->u.section_filter.opaque;
1184 const uint8_t *p, *p_end;
1186 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1187 int mp4_descr_count = 0;
1189 AVFormatContext *s = ts->stream;
1191 p_end = section + section_len - 4;
1193 if (parse_section_header(&h, &p, p_end) < 0)
1195 if (h.tid != M4OD_TID)
1198 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1200 for (pid = 0; pid < NB_PID_MAX; pid++) {
1203 for (i = 0; i < mp4_descr_count; i++) {
1206 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1208 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1209 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1212 pes = ts->pids[pid]->u.pes_filter.opaque;
1218 pes->sl = mp4_descr[i].sl;
1220 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1221 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1222 ff_mp4_read_dec_config_descr(s, st, &pb);
1223 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1224 st->codec->extradata_size > 0)
1225 st->need_parsing = 0;
1226 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1227 st->codec->extradata_size > 0)
1228 st->need_parsing = 0;
1230 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1231 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO) {
1232 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1233 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE) {
1234 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1235 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN) {
1236 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1240 for (i = 0; i < mp4_descr_count; i++)
1241 av_free(mp4_descr[i].dec_config_descr);
1244 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1245 const uint8_t **pp, const uint8_t *desc_list_end,
1246 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1249 const uint8_t *desc_end;
1250 int desc_len, desc_tag, desc_es_id;
1254 desc_tag = get8(pp, desc_list_end);
1257 desc_len = get8(pp, desc_list_end);
1260 desc_end = *pp + desc_len;
1261 if (desc_end > desc_list_end)
1264 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1266 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1267 stream_type == STREAM_TYPE_PRIVATE_DATA)
1268 mpegts_find_stream_type(st, desc_tag, DESC_types);
1271 case 0x1E: /* SL descriptor */
1272 desc_es_id = get16(pp, desc_end);
1273 if (ts && ts->pids[pid])
1274 ts->pids[pid]->es_id = desc_es_id;
1275 for (i = 0; i < mp4_descr_count; i++)
1276 if (mp4_descr[i].dec_config_descr_len &&
1277 mp4_descr[i].es_id == desc_es_id) {
1279 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1280 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1281 ff_mp4_read_dec_config_descr(fc, st, &pb);
1282 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1283 st->codec->extradata_size > 0)
1284 st->need_parsing = 0;
1285 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1286 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1289 case 0x1F: /* FMC descriptor */
1290 get16(pp, desc_end);
1291 if (mp4_descr_count > 0 && st->codec->codec_id == AV_CODEC_ID_AAC_LATM &&
1292 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1294 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1295 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1296 ff_mp4_read_dec_config_descr(fc, st, &pb);
1297 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1298 st->codec->extradata_size > 0)
1299 st->need_parsing = 0;
1302 case 0x56: /* DVB teletext descriptor */
1303 language[0] = get8(pp, desc_end);
1304 language[1] = get8(pp, desc_end);
1305 language[2] = get8(pp, desc_end);
1307 av_dict_set(&st->metadata, "language", language, 0);
1309 case 0x59: /* subtitling descriptor */
1310 language[0] = get8(pp, desc_end);
1311 language[1] = get8(pp, desc_end);
1312 language[2] = get8(pp, desc_end);
1314 /* hearing impaired subtitles detection */
1315 switch(get8(pp, desc_end)) {
1316 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1317 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1318 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1319 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1320 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1321 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1322 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1325 if (st->codec->extradata) {
1326 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1327 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1329 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1330 if (st->codec->extradata) {
1331 st->codec->extradata_size = 4;
1332 memcpy(st->codec->extradata, *pp, 4);
1336 av_dict_set(&st->metadata, "language", language, 0);
1338 case 0x0a: /* ISO 639 language descriptor */
1339 for (i = 0; i + 4 <= desc_len; i += 4) {
1340 language[i + 0] = get8(pp, desc_end);
1341 language[i + 1] = get8(pp, desc_end);
1342 language[i + 2] = get8(pp, desc_end);
1343 language[i + 3] = ',';
1344 switch (get8(pp, desc_end)) {
1345 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1346 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1347 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1351 language[i - 1] = 0;
1352 av_dict_set(&st->metadata, "language", language, 0);
1355 case 0x05: /* registration descriptor */
1356 st->codec->codec_tag = bytestream_get_le32(pp);
1357 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1358 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1359 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1368 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1370 MpegTSContext *ts = filter->u.section_filter.opaque;
1371 SectionHeader h1, *h = &h1;
1374 const uint8_t *p, *p_end, *desc_list_end;
1375 int program_info_length, pcr_pid, pid, stream_type;
1377 uint32_t prog_reg_desc = 0; /* registration descriptor */
1379 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1380 int mp4_descr_count = 0;
1383 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1384 hex_dump_debug(ts->stream, section, section_len);
1386 p_end = section + section_len - 4;
1388 if (parse_section_header(h, &p, p_end) < 0)
1391 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1392 h->id, h->sec_num, h->last_sec_num);
1394 if (h->tid != PMT_TID)
1397 clear_program(ts, h->id);
1398 pcr_pid = get16(&p, p_end);
1402 add_pid_to_pmt(ts, h->id, pcr_pid);
1404 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1406 program_info_length = get16(&p, p_end);
1407 if (program_info_length < 0)
1409 program_info_length &= 0xfff;
1410 while(program_info_length >= 2) {
1412 tag = get8(&p, p_end);
1413 len = get8(&p, p_end);
1415 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1417 if(len > program_info_length - 2)
1418 //something else is broken, exit the program_descriptors_loop
1420 program_info_length -= len + 2;
1421 if (tag == 0x1d) { // IOD descriptor
1422 get8(&p, p_end); // scope
1423 get8(&p, p_end); // label
1425 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1426 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1427 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1428 prog_reg_desc = bytestream_get_le32(&p);
1433 p += program_info_length;
1437 // stop parsing after pmt, we found header
1438 if (!ts->stream->nb_streams)
1444 stream_type = get8(&p, p_end);
1445 if (stream_type < 0)
1447 pid = get16(&p, p_end);
1452 /* now create stream */
1453 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1454 pes = ts->pids[pid]->u.pes_filter.opaque;
1456 pes->st = avformat_new_stream(pes->stream, NULL);
1457 pes->st->id = pes->pid;
1460 } else if (stream_type != 0x13) {
1461 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1462 pes = add_pes_stream(ts, pid, pcr_pid);
1464 st = avformat_new_stream(pes->stream, NULL);
1468 int idx = ff_find_stream_index(ts->stream, pid);
1470 st = ts->stream->streams[idx];
1472 st = avformat_new_stream(ts->stream, NULL);
1474 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1481 if (pes && !pes->stream_type)
1482 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1484 add_pid_to_pmt(ts, h->id, pid);
1486 ff_program_add_stream_index(ts->stream, h->id, st->index);
1488 desc_list_len = get16(&p, p_end);
1489 if (desc_list_len < 0)
1491 desc_list_len &= 0xfff;
1492 desc_list_end = p + desc_list_len;
1493 if (desc_list_end > p_end)
1496 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1497 mp4_descr, mp4_descr_count, pid, ts) < 0)
1500 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1501 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1502 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1509 for (i = 0; i < mp4_descr_count; i++)
1510 av_free(mp4_descr[i].dec_config_descr);
1513 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1515 MpegTSContext *ts = filter->u.section_filter.opaque;
1516 SectionHeader h1, *h = &h1;
1517 const uint8_t *p, *p_end;
1520 av_dlog(ts->stream, "PAT:\n");
1521 hex_dump_debug(ts->stream, section, section_len);
1523 p_end = section + section_len - 4;
1525 if (parse_section_header(h, &p, p_end) < 0)
1527 if (h->tid != PAT_TID)
1532 sid = get16(&p, p_end);
1535 pmt_pid = get16(&p, p_end);
1540 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1542 if (sid == 0x0000) {
1545 av_new_program(ts->stream, sid);
1546 if (ts->pids[pmt_pid])
1547 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1548 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1549 add_pat_entry(ts, sid);
1550 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1551 add_pid_to_pmt(ts, sid, pmt_pid);
1556 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1558 MpegTSContext *ts = filter->u.section_filter.opaque;
1559 SectionHeader h1, *h = &h1;
1560 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1561 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1562 char *name, *provider_name;
1564 av_dlog(ts->stream, "SDT:\n");
1565 hex_dump_debug(ts->stream, section, section_len);
1567 p_end = section + section_len - 4;
1569 if (parse_section_header(h, &p, p_end) < 0)
1571 if (h->tid != SDT_TID)
1573 onid = get16(&p, p_end);
1576 val = get8(&p, p_end);
1580 sid = get16(&p, p_end);
1583 val = get8(&p, p_end);
1586 desc_list_len = get16(&p, p_end);
1587 if (desc_list_len < 0)
1589 desc_list_len &= 0xfff;
1590 desc_list_end = p + desc_list_len;
1591 if (desc_list_end > p_end)
1594 desc_tag = get8(&p, desc_list_end);
1597 desc_len = get8(&p, desc_list_end);
1598 desc_end = p + desc_len;
1599 if (desc_end > desc_list_end)
1602 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1603 desc_tag, desc_len);
1607 service_type = get8(&p, p_end);
1608 if (service_type < 0)
1610 provider_name = getstr8(&p, p_end);
1613 name = getstr8(&p, p_end);
1615 AVProgram *program = av_new_program(ts->stream, sid);
1617 av_dict_set(&program->metadata, "service_name", name, 0);
1618 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1622 av_free(provider_name);
1633 /* handle one TS packet */
1634 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1636 AVFormatContext *s = ts->stream;
1638 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1639 has_adaptation, has_payload;
1640 const uint8_t *p, *p_end;
1643 pid = AV_RB16(packet + 1) & 0x1fff;
1644 if(pid && discard_pid(ts, pid))
1646 is_start = packet[1] & 0x40;
1647 tss = ts->pids[pid];
1648 if (ts->auto_guess && tss == NULL && is_start) {
1649 add_pes_stream(ts, pid, -1);
1650 tss = ts->pids[pid];
1655 afc = (packet[3] >> 4) & 3;
1656 if (afc == 0) /* reserved value */
1658 has_adaptation = afc & 2;
1659 has_payload = afc & 1;
1660 is_discontinuity = has_adaptation
1661 && packet[4] != 0 /* with length > 0 */
1662 && (packet[5] & 0x80); /* and discontinuity indicated */
1664 /* continuity check (currently not used) */
1665 cc = (packet[3] & 0xf);
1666 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1667 cc_ok = pid == 0x1FFF // null packet PID
1670 || expected_cc == cc;
1674 av_log(ts->stream, AV_LOG_WARNING,
1675 "Continuity check failed for pid %d expected %d got %d\n",
1676 pid, expected_cc, cc);
1677 if(tss->type == MPEGTS_PES) {
1678 PESContext *pc = tss->u.pes_filter.opaque;
1679 pc->flags |= AV_PKT_FLAG_CORRUPT;
1686 if (has_adaptation) {
1687 /* skip adaptation field */
1690 /* if past the end of packet, ignore */
1691 p_end = packet + TS_PACKET_SIZE;
1695 pos = avio_tell(ts->stream->pb);
1696 ts->pos47= pos % ts->raw_packet_size;
1698 if (tss->type == MPEGTS_SECTION) {
1700 /* pointer field present */
1702 if (p + len > p_end)
1705 /* write remaining section bytes */
1706 write_section_data(s, tss,
1708 /* check whether filter has been closed */
1714 write_section_data(s, tss,
1719 write_section_data(s, tss,
1725 // Note: The position here points actually behind the current packet.
1726 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1727 pos - ts->raw_packet_size)) < 0)
1734 /* XXX: try to find a better synchro over several packets (use
1735 get_packet_size() ?) */
1736 static int mpegts_resync(AVFormatContext *s)
1738 AVIOContext *pb = s->pb;
1741 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1743 if (pb->eof_reached)
1746 avio_seek(pb, -1, SEEK_CUR);
1750 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1755 /* return -1 if error or EOF. Return 0 if OK. */
1756 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1758 AVIOContext *pb = s->pb;
1762 len = avio_read(pb, buf, TS_PACKET_SIZE);
1763 if (len != TS_PACKET_SIZE)
1764 return len < 0 ? len : AVERROR_EOF;
1765 /* check packet sync byte */
1766 if (buf[0] != 0x47) {
1767 /* find a new packet start */
1768 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1769 if (mpegts_resync(s) < 0)
1770 return AVERROR(EAGAIN);
1774 skip = raw_packet_size - TS_PACKET_SIZE;
1776 avio_skip(pb, skip);
1783 static int handle_packets(MpegTSContext *ts, int nb_packets)
1785 AVFormatContext *s = ts->stream;
1786 uint8_t packet[TS_PACKET_SIZE+FF_INPUT_BUFFER_PADDING_SIZE];
1787 int packet_num, ret = 0;
1789 if (avio_tell(s->pb) != ts->last_pos) {
1791 av_dlog(ts->stream, "Skipping after seek\n");
1792 /* seek detected, flush pes buffer */
1793 for (i = 0; i < NB_PID_MAX; i++) {
1795 if (ts->pids[i]->type == MPEGTS_PES) {
1796 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1797 av_freep(&pes->buffer);
1798 pes->data_index = 0;
1799 pes->state = MPEGTS_SKIP; /* skip until pes header */
1801 ts->pids[i]->last_cc = -1;
1808 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1810 if (ts->stop_parse>0)
1813 if (nb_packets != 0 && packet_num >= nb_packets)
1815 ret = read_packet(s, packet, ts->raw_packet_size);
1818 ret = handle_packet(ts, packet);
1822 ts->last_pos = avio_tell(s->pb);
1826 static int mpegts_probe(AVProbeData *p)
1828 const int size= p->buf_size;
1829 int score, fec_score, dvhs_score;
1830 int check_count= size / TS_FEC_PACKET_SIZE;
1831 #define CHECK_COUNT 10
1833 if (check_count < CHECK_COUNT)
1836 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1837 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1838 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1839 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
1840 score, dvhs_score, fec_score);
1842 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1843 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1844 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1845 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1849 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1850 (-1) if not available */
1851 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1852 const uint8_t *packet)
1854 int afc, len, flags;
1858 afc = (packet[3] >> 4) & 3;
1868 if (!(flags & 0x10))
1873 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1874 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1878 static int mpegts_read_header(AVFormatContext *s)
1880 MpegTSContext *ts = s->priv_data;
1881 AVIOContext *pb = s->pb;
1882 uint8_t buf[5*1024];
1886 /* read the first 1024 bytes to get packet size */
1887 pos = avio_tell(pb);
1888 len = avio_read(pb, buf, sizeof(buf));
1889 if (len != sizeof(buf))
1891 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1892 if (ts->raw_packet_size <= 0)
1897 if (s->iformat == &ff_mpegts_demuxer) {
1900 /* first do a scan to get all the services */
1901 if (avio_seek(pb, pos, SEEK_SET) < 0 && pb->seekable)
1902 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1904 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1906 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1908 handle_packets(ts, s->probesize / ts->raw_packet_size);
1909 /* if could not find service, enable auto_guess */
1913 av_dlog(ts->stream, "tuning done\n");
1915 s->ctx_flags |= AVFMTCTX_NOHEADER;
1918 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1919 int64_t pcrs[2], pcr_h;
1920 int packet_count[2];
1921 uint8_t packet[TS_PACKET_SIZE];
1923 /* only read packets */
1925 st = avformat_new_stream(s, NULL);
1928 avpriv_set_pts_info(st, 60, 1, 27000000);
1929 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1930 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
1932 /* we iterate until we find two PCRs to estimate the bitrate */
1937 ret = read_packet(s, packet, ts->raw_packet_size);
1940 pid = AV_RB16(packet + 1) & 0x1fff;
1941 if ((pcr_pid == -1 || pcr_pid == pid) &&
1942 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1944 packet_count[nb_pcrs] = nb_packets;
1945 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1953 /* NOTE1: the bitrate is computed without the FEC */
1954 /* NOTE2: it is only the bitrate of the start of the stream */
1955 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1956 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1957 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1958 st->codec->bit_rate = s->bit_rate;
1959 st->start_time = ts->cur_pcr;
1960 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1961 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1964 avio_seek(pb, pos, SEEK_SET);
1970 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1972 static int mpegts_raw_read_packet(AVFormatContext *s,
1975 MpegTSContext *ts = s->priv_data;
1977 int64_t pcr_h, next_pcr_h, pos;
1978 int pcr_l, next_pcr_l;
1979 uint8_t pcr_buf[12];
1981 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1982 return AVERROR(ENOMEM);
1983 pkt->pos= avio_tell(s->pb);
1984 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1986 av_free_packet(pkt);
1989 if (ts->mpeg2ts_compute_pcr) {
1990 /* compute exact PCR for each packet */
1991 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1992 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1993 pos = avio_tell(s->pb);
1994 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1995 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1996 avio_read(s->pb, pcr_buf, 12);
1997 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1998 /* XXX: not precise enough */
1999 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2004 avio_seek(s->pb, pos, SEEK_SET);
2005 /* no next PCR found: we use previous increment */
2006 ts->cur_pcr = pcr_h * 300 + pcr_l;
2008 pkt->pts = ts->cur_pcr;
2009 pkt->duration = ts->pcr_incr;
2010 ts->cur_pcr += ts->pcr_incr;
2012 pkt->stream_index = 0;
2016 static int mpegts_read_packet(AVFormatContext *s,
2019 MpegTSContext *ts = s->priv_data;
2024 ret = handle_packets(ts, 0);
2026 /* flush pes data left */
2027 for (i = 0; i < NB_PID_MAX; i++) {
2028 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2029 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2030 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2031 new_pes_packet(pes, pkt);
2032 pes->state = MPEGTS_SKIP;
2040 if (!ret && pkt->size < 0)
2041 ret = AVERROR(EINTR);
2045 static int mpegts_read_close(AVFormatContext *s)
2047 MpegTSContext *ts = s->priv_data;
2052 for(i=0;i<NB_PID_MAX;i++)
2053 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2058 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2059 int64_t *ppos, int64_t pos_limit)
2061 MpegTSContext *ts = s->priv_data;
2062 int64_t pos, timestamp;
2063 uint8_t buf[TS_PACKET_SIZE];
2064 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2065 const int find_next= 1;
2066 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2069 avio_seek(s->pb, pos, SEEK_SET);
2070 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2071 return AV_NOPTS_VALUE;
2072 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2073 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2076 pos += ts->raw_packet_size;
2080 pos -= ts->raw_packet_size;
2082 return AV_NOPTS_VALUE;
2083 avio_seek(s->pb, pos, SEEK_SET);
2084 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2085 return AV_NOPTS_VALUE;
2086 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2087 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2097 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
2098 MpegTSContext *ts = s->priv_data;
2099 uint8_t buf[TS_PACKET_SIZE];
2102 if (ff_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
2105 pos= avio_tell(s->pb);
2108 avio_seek(s->pb, pos, SEEK_SET);
2109 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2111 // pid = AV_RB16(buf + 1) & 0x1fff;
2112 if(buf[1] & 0x40) break;
2113 pos += ts->raw_packet_size;
2115 avio_seek(s->pb, pos, SEEK_SET);
2120 /**************************************************************/
2121 /* parsing functions - called from other demuxers such as RTP */
2123 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2127 ts = av_mallocz(sizeof(MpegTSContext));
2130 /* no stream case, currently used by RTP */
2131 ts->raw_packet_size = TS_PACKET_SIZE;
2137 /* return the consumed length if a packet was output, or -1 if no
2139 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2140 const uint8_t *buf, int len)
2148 if (ts->stop_parse>0)
2150 if (len < TS_PACKET_SIZE)
2152 if (buf[0] != 0x47) {
2156 handle_packet(ts, buf);
2157 buf += TS_PACKET_SIZE;
2158 len -= TS_PACKET_SIZE;
2164 void ff_mpegts_parse_close(MpegTSContext *ts)
2168 for(i=0;i<NB_PID_MAX;i++)
2169 av_free(ts->pids[i]);
2173 AVInputFormat ff_mpegts_demuxer = {
2175 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2176 .priv_data_size = sizeof(MpegTSContext),
2177 .read_probe = mpegts_probe,
2178 .read_header = mpegts_read_header,
2179 .read_packet = mpegts_read_packet,
2180 .read_close = mpegts_read_close,
2181 .read_seek = read_seek,
2182 .read_timestamp = mpegts_get_pcr,
2183 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2186 AVInputFormat ff_mpegtsraw_demuxer = {
2187 .name = "mpegtsraw",
2188 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2189 .priv_data_size = sizeof(MpegTSContext),
2190 .read_header = mpegts_read_header,
2191 .read_packet = mpegts_raw_read_packet,
2192 .read_close = mpegts_read_close,
2193 .read_seek = read_seek,
2194 .read_timestamp = mpegts_get_pcr,
2195 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2196 .priv_class = &mpegtsraw_class,