2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/log.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/avassert.h"
29 #include "libavcodec/bytestream.h"
30 #include "libavcodec/get_bits.h"
34 #include "avio_internal.h"
39 /* maximum size in which we look for synchronisation if
40 synchronisation is lost */
41 #define MAX_RESYNC_SIZE 65536
43 #define MAX_PES_PAYLOAD 200*1024
45 #define MAX_MP4_DESCR_COUNT 16
47 enum MpegTSFilterType {
52 typedef struct MpegTSFilter MpegTSFilter;
54 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
56 typedef struct MpegTSPESFilter {
61 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
63 typedef void SetServiceCallback(void *opaque, int ret);
65 typedef struct MpegTSSectionFilter {
69 unsigned int check_crc:1;
70 unsigned int end_of_section_reached:1;
71 SectionCallback *section_cb;
73 } MpegTSSectionFilter;
78 int last_cc; /* last cc code (-1 if first packet) */
79 enum MpegTSFilterType type;
81 MpegTSPESFilter pes_filter;
82 MpegTSSectionFilter section_filter;
86 #define MAX_PIDS_PER_PROGRAM 64
88 unsigned int id; //program id/service id
90 unsigned int pids[MAX_PIDS_PER_PROGRAM];
93 struct MpegTSContext {
96 AVFormatContext *stream;
97 /** raw packet size, including FEC if present */
102 /** if true, all pids are analyzed to find streams */
105 /** compute exact PCR for each transport stream packet */
106 int mpeg2ts_compute_pcr;
108 int64_t cur_pcr; /**< used to estimate the exact PCR */
109 int pcr_incr; /**< used to estimate the exact PCR */
111 /* data needed to handle file based ts */
112 /** stop parsing loop */
114 /** packet containing Audio/Video data */
116 /** to detect seek */
119 /******************************************/
120 /* private mpegts data */
122 /** structure to keep track of Program->pids mapping */
126 int8_t crc_validity[NB_PID_MAX];
128 /** filters for various streams specified by PMT + for the PAT and PMT */
129 MpegTSFilter *pids[NB_PID_MAX];
132 static const AVOption options[] = {
133 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
134 {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
138 static const AVClass mpegtsraw_class = {
139 .class_name = "mpegtsraw demuxer",
140 .item_name = av_default_item_name,
142 .version = LIBAVUTIL_VERSION_INT,
145 /* TS stream handling */
150 MPEGTS_PESHEADER_FILL,
155 /* enough for PES header + length */
156 #define PES_START_SIZE 6
157 #define PES_HEADER_SIZE 9
158 #define MAX_PES_HEADER_SIZE (9 + 255)
160 typedef struct PESContext {
162 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
165 AVFormatContext *stream;
167 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
168 enum MpegTSState state;
169 /* used to get the format */
171 int flags; /**< copied to the AVPacket flags */
174 int extended_stream_id;
176 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
177 uint8_t header[MAX_PES_HEADER_SIZE];
182 extern AVInputFormat ff_mpegts_demuxer;
184 static void clear_program(MpegTSContext *ts, unsigned int programid)
188 for(i=0; i<ts->nb_prg; i++)
189 if(ts->prg[i].id == programid)
190 ts->prg[i].nb_pids = 0;
193 static void clear_programs(MpegTSContext *ts)
199 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
202 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
206 p = &ts->prg[ts->nb_prg];
212 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
215 struct Program *p = NULL;
216 for(i=0; i<ts->nb_prg; i++) {
217 if(ts->prg[i].id == programid) {
225 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
227 p->pids[p->nb_pids++] = pid;
230 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
233 for(i=0; i<s->nb_programs; i++) {
234 if(s->programs[i]->id == programid) {
235 s->programs[i]->pcr_pid = pid;
242 * @brief discard_pid() decides if the pid is to be discarded according
243 * to caller's programs selection
244 * @param ts : - TS context
246 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
249 static int discard_pid(MpegTSContext *ts, unsigned int pid)
252 int used = 0, discarded = 0;
254 for(i=0; i<ts->nb_prg; i++) {
256 for(j=0; j<p->nb_pids; j++) {
257 if(p->pids[j] != pid)
259 //is program with id p->id set to be discarded?
260 for(k=0; k<ts->stream->nb_programs; k++) {
261 if(ts->stream->programs[k]->id == p->id) {
262 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
271 return !used && discarded;
275 * Assemble PES packets out of TS packets, and then call the "section_cb"
276 * function when they are complete.
278 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
279 const uint8_t *buf, int buf_size, int is_start)
281 MpegTSContext *ts = s->priv_data;
282 MpegTSSectionFilter *tss = &tss1->u.section_filter;
286 memcpy(tss->section_buf, buf, buf_size);
287 tss->section_index = buf_size;
288 tss->section_h_size = -1;
289 tss->end_of_section_reached = 0;
291 if (tss->end_of_section_reached)
293 len = 4096 - tss->section_index;
296 memcpy(tss->section_buf + tss->section_index, buf, len);
297 tss->section_index += len;
300 /* compute section length if possible */
301 if (tss->section_h_size == -1 && tss->section_index >= 3) {
302 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
305 tss->section_h_size = len;
308 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
310 tss->end_of_section_reached = 1;
313 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
315 ts->crc_validity[ tss1->pid ] = 100;
316 }else if(ts->crc_validity[ tss1->pid ] > -10){
317 ts->crc_validity[ tss1->pid ]--;
322 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
326 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
327 SectionCallback *section_cb, void *opaque,
331 MpegTSFilter *filter;
332 MpegTSSectionFilter *sec;
334 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
336 if (pid >= NB_PID_MAX || ts->pids[pid])
338 filter = av_mallocz(sizeof(MpegTSFilter));
341 ts->pids[pid] = filter;
342 filter->type = MPEGTS_SECTION;
345 filter->last_cc = -1;
346 sec = &filter->u.section_filter;
347 sec->section_cb = section_cb;
348 sec->opaque = opaque;
349 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
350 sec->check_crc = check_crc;
351 if (!sec->section_buf) {
358 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
362 MpegTSFilter *filter;
363 MpegTSPESFilter *pes;
365 if (pid >= NB_PID_MAX || ts->pids[pid])
367 filter = av_mallocz(sizeof(MpegTSFilter));
370 ts->pids[pid] = filter;
371 filter->type = MPEGTS_PES;
374 filter->last_cc = -1;
375 pes = &filter->u.pes_filter;
376 pes->pes_cb = pes_cb;
377 pes->opaque = opaque;
381 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
386 if (filter->type == MPEGTS_SECTION)
387 av_freep(&filter->u.section_filter.section_buf);
388 else if (filter->type == MPEGTS_PES) {
389 PESContext *pes = filter->u.pes_filter.opaque;
390 av_freep(&pes->buffer);
391 /* referenced private data will be freed later in
392 * avformat_close_input */
393 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
394 av_freep(&filter->u.pes_filter.opaque);
399 ts->pids[pid] = NULL;
402 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
403 int stat[TS_MAX_PACKET_SIZE];
408 memset(stat, 0, packet_size*sizeof(int));
410 for(x=i=0; i<size-3; i++){
411 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){
413 if(stat[x] > best_score){
420 if(x == packet_size) x= 0;
426 /* autodetect fec presence. Must have at least 1024 bytes */
427 static int get_packet_size(const uint8_t *buf, int size)
429 int score, fec_score, dvhs_score;
431 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
434 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
435 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
436 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
437 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
438 score, dvhs_score, fec_score);
440 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
441 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
442 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
446 typedef struct SectionHeader {
451 uint8_t last_sec_num;
454 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
467 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
473 if ((p + 1) >= p_end)
481 /* read and allocate a DVB string preceded by its length */
482 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
489 len = get8(&p, p_end);
492 if ((p + len) > p_end)
494 str = av_malloc(len + 1);
504 static int parse_section_header(SectionHeader *h,
505 const uint8_t **pp, const uint8_t *p_end)
509 val = get8(pp, p_end);
514 val = get16(pp, p_end);
518 val = get8(pp, p_end);
521 h->version = (val >> 1) & 0x1f;
522 val = get8(pp, p_end);
526 val = get8(pp, p_end);
529 h->last_sec_num = val;
534 uint32_t stream_type;
535 enum AVMediaType codec_type;
536 enum AVCodecID codec_id;
539 static const StreamType ISO_types[] = {
540 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
541 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
542 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
543 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
544 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
545 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
546 /* Makito encoder sets stream type 0x11 for AAC,
547 * so auto-detect LOAS/LATM instead of hardcoding it. */
548 // { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
549 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
550 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
551 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
555 static const StreamType HDMV_types[] = {
556 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
557 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
558 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
559 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
560 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
561 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
562 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
563 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
564 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
565 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
570 static const StreamType MISC_types[] = {
571 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
572 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
576 static const StreamType REGD_types[] = {
577 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
578 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
579 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
580 { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
581 { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
582 { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
583 { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
587 /* descriptor present */
588 static const StreamType DESC_types[] = {
589 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
590 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
591 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
592 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
593 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
597 static void mpegts_find_stream_type(AVStream *st,
598 uint32_t stream_type, const StreamType *types)
600 for (; types->stream_type; types++) {
601 if (stream_type == types->stream_type) {
602 st->codec->codec_type = types->codec_type;
603 st->codec->codec_id = types->codec_id;
604 st->request_probe = 0;
610 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
611 uint32_t stream_type, uint32_t prog_reg_desc)
613 int old_codec_type= st->codec->codec_type;
614 int old_codec_id = st->codec->codec_id;
615 avpriv_set_pts_info(st, 33, 1, 90000);
617 st->codec->codec_type = AVMEDIA_TYPE_DATA;
618 st->codec->codec_id = AV_CODEC_ID_NONE;
619 st->need_parsing = AVSTREAM_PARSE_FULL;
621 pes->stream_type = stream_type;
623 av_log(pes->stream, AV_LOG_DEBUG,
624 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
625 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
627 st->codec->codec_tag = pes->stream_type;
629 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
630 if ((prog_reg_desc == AV_RL32("HDMV") ||
631 prog_reg_desc == AV_RL32("HDPR")) &&
632 st->codec->codec_id == AV_CODEC_ID_NONE) {
633 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
634 if (pes->stream_type == 0x83) {
635 // HDMV TrueHD streams also contain an AC3 coded version of the
636 // audio track - add a second stream for this
638 // priv_data cannot be shared between streams
639 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
641 return AVERROR(ENOMEM);
642 memcpy(sub_pes, pes, sizeof(*sub_pes));
644 sub_st = avformat_new_stream(pes->stream, NULL);
647 return AVERROR(ENOMEM);
650 sub_st->id = pes->pid;
651 avpriv_set_pts_info(sub_st, 33, 1, 90000);
652 sub_st->priv_data = sub_pes;
653 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
654 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
655 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
656 sub_pes->sub_st = pes->sub_st = sub_st;
659 if (st->codec->codec_id == AV_CODEC_ID_NONE)
660 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
661 if (st->codec->codec_id == AV_CODEC_ID_NONE){
662 st->codec->codec_id = old_codec_id;
663 st->codec->codec_type= old_codec_type;
669 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
673 pkt->destruct = av_destruct_packet;
674 pkt->data = pes->buffer;
675 pkt->size = pes->data_index;
677 if(pes->total_size != MAX_PES_PAYLOAD &&
678 pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
679 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
680 pes->flags |= AV_PKT_FLAG_CORRUPT;
682 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
684 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
685 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
686 pkt->stream_index = pes->sub_st->index;
688 pkt->stream_index = pes->st->index;
691 /* store position of first TS packet of this PES packet */
692 pkt->pos = pes->ts_packet_pos;
693 pkt->flags = pes->flags;
695 /* reset pts values */
696 pes->pts = AV_NOPTS_VALUE;
697 pes->dts = AV_NOPTS_VALUE;
703 static uint64_t get_bits64(GetBitContext *gb, int bits)
707 if (get_bits_left(gb) < bits)
708 return AV_NOPTS_VALUE;
711 ret |= get_bits(gb, 17);
715 ret |= get_bits(gb, bits);
719 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
722 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
723 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
724 int dts_flag = -1, cts_flag = -1;
725 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
727 init_get_bits(&gb, buf, buf_size*8);
729 if (sl->use_au_start)
730 au_start_flag = get_bits1(&gb);
732 au_end_flag = get_bits1(&gb);
733 if (!sl->use_au_start && !sl->use_au_end)
734 au_start_flag = au_end_flag = 1;
736 ocr_flag = get_bits1(&gb);
738 idle_flag = get_bits1(&gb);
740 padding_flag = get_bits1(&gb);
742 padding_bits = get_bits(&gb, 3);
744 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
745 if (sl->packet_seq_num_len)
746 skip_bits_long(&gb, sl->packet_seq_num_len);
747 if (sl->degr_prior_len)
749 skip_bits(&gb, sl->degr_prior_len);
751 skip_bits_long(&gb, sl->ocr_len);
753 if (sl->use_rand_acc_pt)
755 if (sl->au_seq_num_len > 0)
756 skip_bits_long(&gb, sl->au_seq_num_len);
757 if (sl->use_timestamps) {
758 dts_flag = get_bits1(&gb);
759 cts_flag = get_bits1(&gb);
762 if (sl->inst_bitrate_len)
763 inst_bitrate_flag = get_bits1(&gb);
765 dts = get_bits64(&gb, sl->timestamp_len);
767 cts = get_bits64(&gb, sl->timestamp_len);
769 skip_bits_long(&gb, sl->au_len);
770 if (inst_bitrate_flag)
771 skip_bits_long(&gb, sl->inst_bitrate_len);
774 if (dts != AV_NOPTS_VALUE)
776 if (cts != AV_NOPTS_VALUE)
779 if (sl->timestamp_len && sl->timestamp_res)
780 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
782 return (get_bits_count(&gb) + 7) >> 3;
785 /* return non zero if a packet could be constructed */
786 static int mpegts_push_data(MpegTSFilter *filter,
787 const uint8_t *buf, int buf_size, int is_start,
790 PESContext *pes = filter->u.pes_filter.opaque;
791 MpegTSContext *ts = pes->ts;
799 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
800 new_pes_packet(pes, ts->pkt);
803 pes->state = MPEGTS_HEADER;
805 pes->ts_packet_pos = pos;
808 while (buf_size > 0) {
811 len = PES_START_SIZE - pes->data_index;
814 memcpy(pes->header + pes->data_index, p, len);
815 pes->data_index += len;
818 if (pes->data_index == PES_START_SIZE) {
819 /* we got all the PES or section header. We can now
821 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
822 pes->header[2] == 0x01) {
823 /* it must be an mpeg2 PES stream */
824 code = pes->header[3] | 0x100;
825 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
827 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
828 (!pes->sub_st || pes->sub_st->discard == AVDISCARD_ALL)) ||
829 code == 0x1be) /* padding_stream */
832 /* stream not present in PMT */
834 pes->st = avformat_new_stream(ts->stream, NULL);
836 return AVERROR(ENOMEM);
837 pes->st->id = pes->pid;
838 mpegts_set_stream_info(pes->st, pes, 0, 0);
841 pes->total_size = AV_RB16(pes->header + 4);
842 /* NOTE: a zero total size means the PES size is
844 if (!pes->total_size)
845 pes->total_size = MAX_PES_PAYLOAD;
847 /* allocate pes buffer */
848 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
850 return AVERROR(ENOMEM);
852 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
853 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
854 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
855 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
856 pes->state = MPEGTS_PESHEADER;
857 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
858 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
859 pes->pid, pes->stream_type);
860 pes->st->request_probe= 1;
863 pes->state = MPEGTS_PAYLOAD;
867 /* otherwise, it should be a table */
870 pes->state = MPEGTS_SKIP;
875 /**********************************************/
876 /* PES packing parsing */
877 case MPEGTS_PESHEADER:
878 len = PES_HEADER_SIZE - pes->data_index;
883 memcpy(pes->header + pes->data_index, p, len);
884 pes->data_index += len;
887 if (pes->data_index == PES_HEADER_SIZE) {
888 pes->pes_header_size = pes->header[8] + 9;
889 pes->state = MPEGTS_PESHEADER_FILL;
892 case MPEGTS_PESHEADER_FILL:
893 len = pes->pes_header_size - pes->data_index;
898 memcpy(pes->header + pes->data_index, p, len);
899 pes->data_index += len;
902 if (pes->data_index == pes->pes_header_size) {
904 unsigned int flags, pes_ext, skip;
906 flags = pes->header[7];
908 pes->pts = AV_NOPTS_VALUE;
909 pes->dts = AV_NOPTS_VALUE;
910 if ((flags & 0xc0) == 0x80) {
911 pes->dts = pes->pts = ff_parse_pes_pts(r);
913 } else if ((flags & 0xc0) == 0xc0) {
914 pes->pts = ff_parse_pes_pts(r);
916 pes->dts = ff_parse_pes_pts(r);
919 pes->extended_stream_id = -1;
920 if (flags & 0x01) { /* PES extension */
922 /* Skip PES private data, program packet sequence counter and P-STD buffer */
923 skip = (pes_ext >> 4) & 0xb;
926 if ((pes_ext & 0x41) == 0x01 &&
927 (r + 2) <= (pes->header + pes->pes_header_size)) {
928 /* PES extension 2 */
929 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
930 pes->extended_stream_id = r[1];
934 /* we got the full header. We parse it and get the payload */
935 pes->state = MPEGTS_PAYLOAD;
937 if (pes->stream_type == 0x12 && buf_size > 0) {
938 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
939 pes->pes_header_size += sl_header_bytes;
940 p += sl_header_bytes;
941 buf_size -= sl_header_bytes;
946 if (buf_size > 0 && pes->buffer) {
947 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
948 new_pes_packet(pes, ts->pkt);
949 pes->total_size = MAX_PES_PAYLOAD;
950 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
952 return AVERROR(ENOMEM);
954 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
955 // pes packet size is < ts size packet and pes data is padded with 0xff
956 // not sure if this is legal in ts but see issue #2392
957 buf_size = pes->total_size;
959 memcpy(pes->buffer+pes->data_index, p, buf_size);
960 pes->data_index += buf_size;
963 /* emit complete packets with known packet size
964 * decreases demuxer delay for infrequent packets like subtitles from
965 * a couple of seconds to milliseconds for properly muxed files.
966 * total_size is the number of bytes following pes_packet_length
967 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
968 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
969 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
971 new_pes_packet(pes, ts->pkt);
983 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
988 /* if no pid found, then add a pid context */
989 pes = av_mallocz(sizeof(PESContext));
993 pes->stream = ts->stream;
995 pes->pcr_pid = pcr_pid;
996 pes->state = MPEGTS_SKIP;
997 pes->pts = AV_NOPTS_VALUE;
998 pes->dts = AV_NOPTS_VALUE;
999 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1012 Mp4Descr *active_descr;
1014 int max_descr_count;
1016 } MP4DescrParseContext;
1018 static int init_MP4DescrParseContext(
1019 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
1020 unsigned size, Mp4Descr *descr, int max_descr_count)
1024 return AVERROR_INVALIDDATA;
1026 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
1027 NULL, NULL, NULL, NULL)) < 0)
1034 d->active_descr = NULL;
1035 d->max_descr_count = max_descr_count;
1040 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
1041 int64_t new_off = avio_tell(pb);
1042 (*len) -= new_off - *off;
1046 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1049 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1052 if (parse_mp4_descr(d, off, len, 0) < 0)
1054 update_offsets(&d->pb, &off, &len);
1059 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1061 avio_rb16(&d->pb); // ID
1067 update_offsets(&d->pb, &off, &len);
1068 return parse_mp4_descr_arr(d, off, len);
1071 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1076 id_flags = avio_rb16(&d->pb);
1077 if (!(id_flags & 0x0020)) { //URL_Flag
1078 update_offsets(&d->pb, &off, &len);
1079 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1085 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1088 if (d->descr_count >= d->max_descr_count)
1090 ff_mp4_parse_es_descr(&d->pb, &es_id);
1091 d->active_descr = d->descr + (d->descr_count++);
1093 d->active_descr->es_id = es_id;
1094 update_offsets(&d->pb, &off, &len);
1095 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1096 update_offsets(&d->pb, &off, &len);
1098 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1099 d->active_descr = NULL;
1103 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1105 Mp4Descr *descr = d->active_descr;
1108 d->active_descr->dec_config_descr = av_malloc(len);
1109 if (!descr->dec_config_descr)
1110 return AVERROR(ENOMEM);
1111 descr->dec_config_descr_len = len;
1112 avio_read(&d->pb, descr->dec_config_descr, len);
1116 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1118 Mp4Descr *descr = d->active_descr;
1123 predefined = avio_r8(&d->pb);
1126 int flags = avio_r8(&d->pb);
1127 descr->sl.use_au_start = !!(flags & 0x80);
1128 descr->sl.use_au_end = !!(flags & 0x40);
1129 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1130 descr->sl.use_padding = !!(flags & 0x08);
1131 descr->sl.use_timestamps = !!(flags & 0x04);
1132 descr->sl.use_idle = !!(flags & 0x02);
1133 descr->sl.timestamp_res = avio_rb32(&d->pb);
1135 descr->sl.timestamp_len = avio_r8(&d->pb);
1136 descr->sl.ocr_len = avio_r8(&d->pb);
1137 descr->sl.au_len = avio_r8(&d->pb);
1138 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1139 lengths = avio_rb16(&d->pb);
1140 descr->sl.degr_prior_len = lengths >> 12;
1141 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1142 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1144 av_log_missing_feature(d->s, "Predefined SLConfigDescriptor", 0);
1149 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1152 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1153 update_offsets(&d->pb, &off, &len);
1154 if (len < 0 || len1 > len || len1 <= 0) {
1155 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1159 if (d->level++ >= MAX_LEVEL) {
1160 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1164 if (target_tag && tag != target_tag) {
1165 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1171 parse_MP4IODescrTag(d, off, len1);
1174 parse_MP4ODescrTag(d, off, len1);
1177 parse_MP4ESDescrTag(d, off, len1);
1179 case MP4DecConfigDescrTag:
1180 parse_MP4DecConfigDescrTag(d, off, len1);
1183 parse_MP4SLDescrTag(d, off, len1);
1189 avio_seek(&d->pb, off + len1, SEEK_SET);
1193 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1194 Mp4Descr *descr, int *descr_count, int max_descr_count)
1196 MP4DescrParseContext d;
1197 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1200 parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1202 *descr_count = d.descr_count;
1206 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1207 Mp4Descr *descr, int *descr_count, int max_descr_count)
1209 MP4DescrParseContext d;
1210 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1213 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1215 *descr_count = d.descr_count;
1219 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1221 MpegTSContext *ts = filter->u.section_filter.opaque;
1223 const uint8_t *p, *p_end;
1225 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1226 int mp4_descr_count = 0;
1228 AVFormatContext *s = ts->stream;
1230 p_end = section + section_len - 4;
1232 if (parse_section_header(&h, &p, p_end) < 0)
1234 if (h.tid != M4OD_TID)
1237 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1239 for (pid = 0; pid < NB_PID_MAX; pid++) {
1242 for (i = 0; i < mp4_descr_count; i++) {
1245 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1247 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1248 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1251 pes = ts->pids[pid]->u.pes_filter.opaque;
1257 pes->sl = mp4_descr[i].sl;
1259 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1260 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1261 ff_mp4_read_dec_config_descr(s, st, &pb);
1262 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1263 st->codec->extradata_size > 0)
1264 st->need_parsing = 0;
1265 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1266 st->codec->extradata_size > 0)
1267 st->need_parsing = 0;
1269 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1270 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO) {
1271 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1272 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE) {
1273 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1274 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN) {
1275 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1279 for (i = 0; i < mp4_descr_count; i++)
1280 av_free(mp4_descr[i].dec_config_descr);
1283 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1284 const uint8_t **pp, const uint8_t *desc_list_end,
1285 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1288 const uint8_t *desc_end;
1289 int desc_len, desc_tag, desc_es_id;
1293 desc_tag = get8(pp, desc_list_end);
1296 desc_len = get8(pp, desc_list_end);
1299 desc_end = *pp + desc_len;
1300 if (desc_end > desc_list_end)
1303 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1305 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1306 stream_type == STREAM_TYPE_PRIVATE_DATA)
1307 mpegts_find_stream_type(st, desc_tag, DESC_types);
1310 case 0x1E: /* SL descriptor */
1311 desc_es_id = get16(pp, desc_end);
1312 if (ts && ts->pids[pid])
1313 ts->pids[pid]->es_id = desc_es_id;
1314 for (i = 0; i < mp4_descr_count; i++)
1315 if (mp4_descr[i].dec_config_descr_len &&
1316 mp4_descr[i].es_id == desc_es_id) {
1318 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1319 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1320 ff_mp4_read_dec_config_descr(fc, st, &pb);
1321 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1322 st->codec->extradata_size > 0)
1323 st->need_parsing = 0;
1324 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1325 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1328 case 0x1F: /* FMC descriptor */
1329 get16(pp, desc_end);
1330 if (mp4_descr_count > 0 && (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe>0) &&
1331 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1333 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1334 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1335 ff_mp4_read_dec_config_descr(fc, st, &pb);
1336 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1337 st->codec->extradata_size > 0){
1338 st->request_probe= st->need_parsing = 0;
1339 st->codec->codec_type= AVMEDIA_TYPE_AUDIO;
1343 case 0x56: /* DVB teletext descriptor */
1344 language[0] = get8(pp, desc_end);
1345 language[1] = get8(pp, desc_end);
1346 language[2] = get8(pp, desc_end);
1348 av_dict_set(&st->metadata, "language", language, 0);
1350 case 0x59: /* subtitling descriptor */
1351 language[0] = get8(pp, desc_end);
1352 language[1] = get8(pp, desc_end);
1353 language[2] = get8(pp, desc_end);
1355 /* hearing impaired subtitles detection */
1356 switch(get8(pp, desc_end)) {
1357 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1358 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1359 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1360 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1361 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1362 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1363 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1366 if (st->codec->extradata) {
1367 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1368 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1370 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1371 if (st->codec->extradata) {
1372 st->codec->extradata_size = 4;
1373 memcpy(st->codec->extradata, *pp, 4);
1377 av_dict_set(&st->metadata, "language", language, 0);
1379 case 0x0a: /* ISO 639 language descriptor */
1380 for (i = 0; i + 4 <= desc_len; i += 4) {
1381 language[i + 0] = get8(pp, desc_end);
1382 language[i + 1] = get8(pp, desc_end);
1383 language[i + 2] = get8(pp, desc_end);
1384 language[i + 3] = ',';
1385 switch (get8(pp, desc_end)) {
1386 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1387 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1388 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1392 language[i - 1] = 0;
1393 av_dict_set(&st->metadata, "language", language, 0);
1396 case 0x05: /* registration descriptor */
1397 st->codec->codec_tag = bytestream_get_le32(pp);
1398 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1399 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1400 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1402 case 0x52: /* stream identifier descriptor */
1403 st->stream_identifier = 1 + get8(pp, desc_end);
1412 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1414 MpegTSContext *ts = filter->u.section_filter.opaque;
1415 SectionHeader h1, *h = &h1;
1418 const uint8_t *p, *p_end, *desc_list_end;
1419 int program_info_length, pcr_pid, pid, stream_type;
1421 uint32_t prog_reg_desc = 0; /* registration descriptor */
1423 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1424 int mp4_descr_count = 0;
1427 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1428 hex_dump_debug(ts->stream, section, section_len);
1430 p_end = section + section_len - 4;
1432 if (parse_section_header(h, &p, p_end) < 0)
1435 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1436 h->id, h->sec_num, h->last_sec_num);
1438 if (h->tid != PMT_TID)
1441 clear_program(ts, h->id);
1442 pcr_pid = get16(&p, p_end);
1446 add_pid_to_pmt(ts, h->id, pcr_pid);
1447 set_pcr_pid(ts->stream, h->id, pcr_pid);
1449 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1451 program_info_length = get16(&p, p_end);
1452 if (program_info_length < 0)
1454 program_info_length &= 0xfff;
1455 while(program_info_length >= 2) {
1457 tag = get8(&p, p_end);
1458 len = get8(&p, p_end);
1460 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1462 if(len > program_info_length - 2)
1463 //something else is broken, exit the program_descriptors_loop
1465 program_info_length -= len + 2;
1466 if (tag == 0x1d) { // IOD descriptor
1467 get8(&p, p_end); // scope
1468 get8(&p, p_end); // label
1470 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1471 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1472 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1473 prog_reg_desc = bytestream_get_le32(&p);
1478 p += program_info_length;
1482 // stop parsing after pmt, we found header
1483 if (!ts->stream->nb_streams)
1489 stream_type = get8(&p, p_end);
1490 if (stream_type < 0)
1492 pid = get16(&p, p_end);
1497 /* now create stream */
1498 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1499 pes = ts->pids[pid]->u.pes_filter.opaque;
1501 pes->st = avformat_new_stream(pes->stream, NULL);
1502 pes->st->id = pes->pid;
1505 } else if (stream_type != 0x13) {
1506 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1507 pes = add_pes_stream(ts, pid, pcr_pid);
1509 st = avformat_new_stream(pes->stream, NULL);
1513 int idx = ff_find_stream_index(ts->stream, pid);
1515 st = ts->stream->streams[idx];
1517 st = avformat_new_stream(ts->stream, NULL);
1519 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1526 if (pes && !pes->stream_type)
1527 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1529 add_pid_to_pmt(ts, h->id, pid);
1531 ff_program_add_stream_index(ts->stream, h->id, st->index);
1533 desc_list_len = get16(&p, p_end);
1534 if (desc_list_len < 0)
1536 desc_list_len &= 0xfff;
1537 desc_list_end = p + desc_list_len;
1538 if (desc_list_end > p_end)
1541 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1542 mp4_descr, mp4_descr_count, pid, ts) < 0)
1545 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1546 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1547 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1554 for (i = 0; i < mp4_descr_count; i++)
1555 av_free(mp4_descr[i].dec_config_descr);
1558 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1560 MpegTSContext *ts = filter->u.section_filter.opaque;
1561 SectionHeader h1, *h = &h1;
1562 const uint8_t *p, *p_end;
1566 av_dlog(ts->stream, "PAT:\n");
1567 hex_dump_debug(ts->stream, section, section_len);
1569 p_end = section + section_len - 4;
1571 if (parse_section_header(h, &p, p_end) < 0)
1573 if (h->tid != PAT_TID)
1576 ts->stream->ts_id = h->id;
1580 sid = get16(&p, p_end);
1583 pmt_pid = get16(&p, p_end);
1588 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1590 if (sid == 0x0000) {
1593 program = av_new_program(ts->stream, sid);
1594 program->program_num = sid;
1595 program->pmt_pid = pmt_pid;
1596 if (ts->pids[pmt_pid])
1597 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1598 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1599 add_pat_entry(ts, sid);
1600 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1601 add_pid_to_pmt(ts, sid, pmt_pid);
1606 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1608 MpegTSContext *ts = filter->u.section_filter.opaque;
1609 SectionHeader h1, *h = &h1;
1610 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1611 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1612 char *name, *provider_name;
1614 av_dlog(ts->stream, "SDT:\n");
1615 hex_dump_debug(ts->stream, section, section_len);
1617 p_end = section + section_len - 4;
1619 if (parse_section_header(h, &p, p_end) < 0)
1621 if (h->tid != SDT_TID)
1623 onid = get16(&p, p_end);
1626 val = get8(&p, p_end);
1630 sid = get16(&p, p_end);
1633 val = get8(&p, p_end);
1636 desc_list_len = get16(&p, p_end);
1637 if (desc_list_len < 0)
1639 desc_list_len &= 0xfff;
1640 desc_list_end = p + desc_list_len;
1641 if (desc_list_end > p_end)
1644 desc_tag = get8(&p, desc_list_end);
1647 desc_len = get8(&p, desc_list_end);
1648 desc_end = p + desc_len;
1649 if (desc_end > desc_list_end)
1652 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1653 desc_tag, desc_len);
1657 service_type = get8(&p, p_end);
1658 if (service_type < 0)
1660 provider_name = getstr8(&p, p_end);
1663 name = getstr8(&p, p_end);
1665 AVProgram *program = av_new_program(ts->stream, sid);
1667 av_dict_set(&program->metadata, "service_name", name, 0);
1668 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1672 av_free(provider_name);
1683 /* handle one TS packet */
1684 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1686 AVFormatContext *s = ts->stream;
1688 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1689 has_adaptation, has_payload;
1690 const uint8_t *p, *p_end;
1693 pid = AV_RB16(packet + 1) & 0x1fff;
1694 if(pid && discard_pid(ts, pid))
1696 is_start = packet[1] & 0x40;
1697 tss = ts->pids[pid];
1698 if (ts->auto_guess && tss == NULL && is_start) {
1699 add_pes_stream(ts, pid, -1);
1700 tss = ts->pids[pid];
1705 afc = (packet[3] >> 4) & 3;
1706 if (afc == 0) /* reserved value */
1708 has_adaptation = afc & 2;
1709 has_payload = afc & 1;
1710 is_discontinuity = has_adaptation
1711 && packet[4] != 0 /* with length > 0 */
1712 && (packet[5] & 0x80); /* and discontinuity indicated */
1714 /* continuity check (currently not used) */
1715 cc = (packet[3] & 0xf);
1716 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1717 cc_ok = pid == 0x1FFF // null packet PID
1720 || expected_cc == cc;
1724 av_log(ts->stream, AV_LOG_DEBUG,
1725 "Continuity check failed for pid %d expected %d got %d\n",
1726 pid, expected_cc, cc);
1727 if(tss->type == MPEGTS_PES) {
1728 PESContext *pc = tss->u.pes_filter.opaque;
1729 pc->flags |= AV_PKT_FLAG_CORRUPT;
1736 if (has_adaptation) {
1737 /* skip adaptation field */
1740 /* if past the end of packet, ignore */
1741 p_end = packet + TS_PACKET_SIZE;
1745 pos = avio_tell(ts->stream->pb);
1746 ts->pos47= pos % ts->raw_packet_size;
1748 if (tss->type == MPEGTS_SECTION) {
1750 /* pointer field present */
1752 if (p + len > p_end)
1755 /* write remaining section bytes */
1756 write_section_data(s, tss,
1758 /* check whether filter has been closed */
1764 write_section_data(s, tss,
1769 write_section_data(s, tss,
1775 // Note: The position here points actually behind the current packet.
1776 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1777 pos - ts->raw_packet_size)) < 0)
1784 /* XXX: try to find a better synchro over several packets (use
1785 get_packet_size() ?) */
1786 static int mpegts_resync(AVFormatContext *s)
1788 AVIOContext *pb = s->pb;
1791 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1796 avio_seek(pb, -1, SEEK_CUR);
1800 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1805 /* return -1 if error or EOF. Return 0 if OK. */
1806 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1808 AVIOContext *pb = s->pb;
1812 len = avio_read(pb, buf, TS_PACKET_SIZE);
1813 if (len != TS_PACKET_SIZE)
1814 return len < 0 ? len : AVERROR_EOF;
1815 /* check packet sync byte */
1816 if (buf[0] != 0x47) {
1817 /* find a new packet start */
1818 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1819 if (mpegts_resync(s) < 0)
1820 return AVERROR(EAGAIN);
1824 skip = raw_packet_size - TS_PACKET_SIZE;
1826 avio_skip(pb, skip);
1833 static int handle_packets(MpegTSContext *ts, int nb_packets)
1835 AVFormatContext *s = ts->stream;
1836 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
1837 int packet_num, ret = 0;
1839 if (avio_tell(s->pb) != ts->last_pos) {
1841 av_dlog(ts->stream, "Skipping after seek\n");
1842 /* seek detected, flush pes buffer */
1843 for (i = 0; i < NB_PID_MAX; i++) {
1845 if (ts->pids[i]->type == MPEGTS_PES) {
1846 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1847 av_freep(&pes->buffer);
1848 pes->data_index = 0;
1849 pes->state = MPEGTS_SKIP; /* skip until pes header */
1851 ts->pids[i]->last_cc = -1;
1858 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1861 if (nb_packets != 0 && packet_num >= nb_packets ||
1862 ts->stop_parse > 1) {
1863 ret = AVERROR(EAGAIN);
1866 if (ts->stop_parse > 0)
1869 ret = read_packet(s, packet, ts->raw_packet_size);
1872 ret = handle_packet(ts, packet);
1876 ts->last_pos = avio_tell(s->pb);
1880 static int mpegts_probe(AVProbeData *p)
1882 const int size= p->buf_size;
1883 int score, fec_score, dvhs_score;
1884 int check_count= size / TS_FEC_PACKET_SIZE;
1885 #define CHECK_COUNT 10
1887 if (check_count < CHECK_COUNT)
1890 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1891 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1892 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1893 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
1894 score, dvhs_score, fec_score);
1896 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1897 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1898 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1899 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1903 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1904 (-1) if not available */
1905 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1906 const uint8_t *packet)
1908 int afc, len, flags;
1912 afc = (packet[3] >> 4) & 3;
1922 if (!(flags & 0x10))
1927 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1928 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1932 static int mpegts_read_header(AVFormatContext *s)
1934 MpegTSContext *ts = s->priv_data;
1935 AVIOContext *pb = s->pb;
1936 uint8_t buf[8*1024]={0};
1940 /* read the first 8192 bytes to get packet size */
1941 pos = avio_tell(pb);
1942 len = avio_read(pb, buf, sizeof(buf));
1943 ts->raw_packet_size = get_packet_size(buf, len);
1944 if (ts->raw_packet_size <= 0) {
1945 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1946 ts->raw_packet_size = TS_PACKET_SIZE;
1951 if (s->iformat == &ff_mpegts_demuxer) {
1954 /* first do a scan to get all the services */
1955 /* NOTE: We attempt to seek on non-seekable files as well, as the
1956 * probe buffer usually is big enough. Only warn if the seek failed
1957 * on files where the seek should work. */
1958 if (avio_seek(pb, pos, SEEK_SET) < 0)
1959 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
1961 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1963 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1965 handle_packets(ts, s->probesize / ts->raw_packet_size);
1966 /* if could not find service, enable auto_guess */
1970 av_dlog(ts->stream, "tuning done\n");
1972 s->ctx_flags |= AVFMTCTX_NOHEADER;
1975 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1976 int64_t pcrs[2], pcr_h;
1977 int packet_count[2];
1978 uint8_t packet[TS_PACKET_SIZE];
1980 /* only read packets */
1982 st = avformat_new_stream(s, NULL);
1985 avpriv_set_pts_info(st, 60, 1, 27000000);
1986 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1987 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
1989 /* we iterate until we find two PCRs to estimate the bitrate */
1994 ret = read_packet(s, packet, ts->raw_packet_size);
1997 pid = AV_RB16(packet + 1) & 0x1fff;
1998 if ((pcr_pid == -1 || pcr_pid == pid) &&
1999 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
2001 packet_count[nb_pcrs] = nb_packets;
2002 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2010 /* NOTE1: the bitrate is computed without the FEC */
2011 /* NOTE2: it is only the bitrate of the start of the stream */
2012 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2013 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2014 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
2015 st->codec->bit_rate = s->bit_rate;
2016 st->start_time = ts->cur_pcr;
2017 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2018 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2021 avio_seek(pb, pos, SEEK_SET);
2027 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2029 static int mpegts_raw_read_packet(AVFormatContext *s,
2032 MpegTSContext *ts = s->priv_data;
2034 int64_t pcr_h, next_pcr_h, pos;
2035 int pcr_l, next_pcr_l;
2036 uint8_t pcr_buf[12];
2038 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2039 return AVERROR(ENOMEM);
2040 pkt->pos= avio_tell(s->pb);
2041 ret = read_packet(s, pkt->data, ts->raw_packet_size);
2043 av_free_packet(pkt);
2046 if (ts->mpeg2ts_compute_pcr) {
2047 /* compute exact PCR for each packet */
2048 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2049 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2050 pos = avio_tell(s->pb);
2051 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
2052 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2053 avio_read(s->pb, pcr_buf, 12);
2054 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2055 /* XXX: not precise enough */
2056 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2061 avio_seek(s->pb, pos, SEEK_SET);
2062 /* no next PCR found: we use previous increment */
2063 ts->cur_pcr = pcr_h * 300 + pcr_l;
2065 pkt->pts = ts->cur_pcr;
2066 pkt->duration = ts->pcr_incr;
2067 ts->cur_pcr += ts->pcr_incr;
2069 pkt->stream_index = 0;
2073 static int mpegts_read_packet(AVFormatContext *s,
2076 MpegTSContext *ts = s->priv_data;
2081 ret = handle_packets(ts, 0);
2083 av_free_packet(ts->pkt);
2084 /* flush pes data left */
2085 for (i = 0; i < NB_PID_MAX; i++) {
2086 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2087 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2088 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2089 new_pes_packet(pes, pkt);
2090 pes->state = MPEGTS_SKIP;
2098 if (!ret && pkt->size < 0)
2099 ret = AVERROR(EINTR);
2103 static int mpegts_read_close(AVFormatContext *s)
2105 MpegTSContext *ts = s->priv_data;
2110 for(i=0;i<NB_PID_MAX;i++)
2111 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2116 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2117 int64_t *ppos, int64_t pos_limit)
2119 MpegTSContext *ts = s->priv_data;
2120 int64_t pos, timestamp;
2121 uint8_t buf[TS_PACKET_SIZE];
2122 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2123 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2124 while(pos < pos_limit) {
2125 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2126 return AV_NOPTS_VALUE;
2127 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2128 return AV_NOPTS_VALUE;
2129 if (buf[0] != 0x47) {
2130 if (mpegts_resync(s) < 0)
2131 return AV_NOPTS_VALUE;
2132 pos = avio_tell(s->pb);
2135 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2136 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2140 pos += ts->raw_packet_size;
2143 return AV_NOPTS_VALUE;
2146 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2147 int64_t *ppos, int64_t pos_limit)
2149 MpegTSContext *ts = s->priv_data;
2151 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2152 ff_read_frame_flush(s);
2153 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2154 return AV_NOPTS_VALUE;
2155 while(pos < pos_limit) {
2158 av_init_packet(&pkt);
2159 ret= av_read_frame(s, &pkt);
2161 return AV_NOPTS_VALUE;
2162 av_free_packet(&pkt);
2163 if(pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0){
2164 ff_reduce_index(s, pkt.stream_index);
2165 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2166 if(pkt.stream_index == stream_index){
2174 return AV_NOPTS_VALUE;
2177 /**************************************************************/
2178 /* parsing functions - called from other demuxers such as RTP */
2180 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2184 ts = av_mallocz(sizeof(MpegTSContext));
2187 /* no stream case, currently used by RTP */
2188 ts->raw_packet_size = TS_PACKET_SIZE;
2191 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2192 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2197 /* return the consumed length if a packet was output, or -1 if no
2199 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2200 const uint8_t *buf, int len)
2208 if (len < TS_PACKET_SIZE)
2210 if (buf[0] != 0x47) {
2214 handle_packet(ts, buf);
2215 buf += TS_PACKET_SIZE;
2216 len -= TS_PACKET_SIZE;
2217 if (ts->stop_parse == 1)
2224 void ff_mpegts_parse_close(MpegTSContext *ts)
2228 for(i=0;i<NB_PID_MAX;i++)
2229 av_free(ts->pids[i]);
2233 AVInputFormat ff_mpegts_demuxer = {
2235 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2236 .priv_data_size = sizeof(MpegTSContext),
2237 .read_probe = mpegts_probe,
2238 .read_header = mpegts_read_header,
2239 .read_packet = mpegts_read_packet,
2240 .read_close = mpegts_read_close,
2241 .read_timestamp = mpegts_get_dts,
2242 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2245 AVInputFormat ff_mpegtsraw_demuxer = {
2246 .name = "mpegtsraw",
2247 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2248 .priv_data_size = sizeof(MpegTSContext),
2249 .read_header = mpegts_read_header,
2250 .read_packet = mpegts_raw_read_packet,
2251 .read_close = mpegts_read_close,
2252 .read_timestamp = mpegts_get_dts,
2253 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2254 .priv_class = &mpegtsraw_class,