2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/log.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/avassert.h"
29 #include "libavcodec/bytestream.h"
30 #include "libavcodec/get_bits.h"
34 #include "avio_internal.h"
39 /* maximum size in which we look for synchronisation if
40 synchronisation is lost */
41 #define MAX_RESYNC_SIZE 65536
43 #define MAX_PES_PAYLOAD 200*1024
45 #define MAX_MP4_DESCR_COUNT 16
47 enum MpegTSFilterType {
52 typedef struct MpegTSFilter MpegTSFilter;
54 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
56 typedef struct MpegTSPESFilter {
61 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
63 typedef void SetServiceCallback(void *opaque, int ret);
65 typedef struct MpegTSSectionFilter {
69 unsigned int check_crc:1;
70 unsigned int end_of_section_reached:1;
71 SectionCallback *section_cb;
73 } MpegTSSectionFilter;
78 int last_cc; /* last cc code (-1 if first packet) */
79 enum MpegTSFilterType type;
81 MpegTSPESFilter pes_filter;
82 MpegTSSectionFilter section_filter;
86 #define MAX_PIDS_PER_PROGRAM 64
88 unsigned int id; //program id/service id
90 unsigned int pids[MAX_PIDS_PER_PROGRAM];
93 struct MpegTSContext {
96 AVFormatContext *stream;
97 /** raw packet size, including FEC if present */
102 /** if true, all pids are analyzed to find streams */
105 /** compute exact PCR for each transport stream packet */
106 int mpeg2ts_compute_pcr;
108 int64_t cur_pcr; /**< used to estimate the exact PCR */
109 int pcr_incr; /**< used to estimate the exact PCR */
111 /* data needed to handle file based ts */
112 /** stop parsing loop */
114 /** packet containing Audio/Video data */
116 /** to detect seek */
119 /******************************************/
120 /* private mpegts data */
122 /** structure to keep track of Program->pids mapping */
127 /** filters for various streams specified by PMT + for the PAT and PMT */
128 MpegTSFilter *pids[NB_PID_MAX];
131 static const AVOption options[] = {
132 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
133 {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
137 static const AVClass mpegtsraw_class = {
138 .class_name = "mpegtsraw demuxer",
139 .item_name = av_default_item_name,
141 .version = LIBAVUTIL_VERSION_INT,
144 /* TS stream handling */
149 MPEGTS_PESHEADER_FILL,
154 /* enough for PES header + length */
155 #define PES_START_SIZE 6
156 #define PES_HEADER_SIZE 9
157 #define MAX_PES_HEADER_SIZE (9 + 255)
159 typedef struct PESContext {
161 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
164 AVFormatContext *stream;
166 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
167 enum MpegTSState state;
168 /* used to get the format */
170 int flags; /**< copied to the AVPacket flags */
173 int extended_stream_id;
175 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
176 uint8_t header[MAX_PES_HEADER_SIZE];
181 extern AVInputFormat ff_mpegts_demuxer;
183 static void clear_program(MpegTSContext *ts, unsigned int programid)
187 for(i=0; i<ts->nb_prg; i++)
188 if(ts->prg[i].id == programid)
189 ts->prg[i].nb_pids = 0;
192 static void clear_programs(MpegTSContext *ts)
198 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
201 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
205 p = &ts->prg[ts->nb_prg];
211 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
214 struct Program *p = NULL;
215 for(i=0; i<ts->nb_prg; i++) {
216 if(ts->prg[i].id == programid) {
224 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
226 p->pids[p->nb_pids++] = pid;
229 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
232 for(i=0; i<s->nb_programs; i++) {
233 if(s->programs[i]->id == programid) {
234 s->programs[i]->pcr_pid = pid;
241 * @brief discard_pid() decides if the pid is to be discarded according
242 * to caller's programs selection
243 * @param ts : - TS context
245 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
248 static int discard_pid(MpegTSContext *ts, unsigned int pid)
251 int used = 0, discarded = 0;
253 for(i=0; i<ts->nb_prg; i++) {
255 for(j=0; j<p->nb_pids; j++) {
256 if(p->pids[j] != pid)
258 //is program with id p->id set to be discarded?
259 for(k=0; k<ts->stream->nb_programs; k++) {
260 if(ts->stream->programs[k]->id == p->id) {
261 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
270 return !used && discarded;
274 * Assemble PES packets out of TS packets, and then call the "section_cb"
275 * function when they are complete.
277 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
278 const uint8_t *buf, int buf_size, int is_start)
280 MpegTSSectionFilter *tss = &tss1->u.section_filter;
284 memcpy(tss->section_buf, buf, buf_size);
285 tss->section_index = buf_size;
286 tss->section_h_size = -1;
287 tss->end_of_section_reached = 0;
289 if (tss->end_of_section_reached)
291 len = 4096 - tss->section_index;
294 memcpy(tss->section_buf + tss->section_index, buf, len);
295 tss->section_index += len;
298 /* compute section length if possible */
299 if (tss->section_h_size == -1 && tss->section_index >= 3) {
300 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
303 tss->section_h_size = len;
306 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
307 tss->end_of_section_reached = 1;
308 if (!tss->check_crc ||
309 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
310 tss->section_buf, tss->section_h_size) == 0)
311 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
315 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
316 SectionCallback *section_cb, void *opaque,
320 MpegTSFilter *filter;
321 MpegTSSectionFilter *sec;
323 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
325 if (pid >= NB_PID_MAX || ts->pids[pid])
327 filter = av_mallocz(sizeof(MpegTSFilter));
330 ts->pids[pid] = filter;
331 filter->type = MPEGTS_SECTION;
334 filter->last_cc = -1;
335 sec = &filter->u.section_filter;
336 sec->section_cb = section_cb;
337 sec->opaque = opaque;
338 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
339 sec->check_crc = check_crc;
340 if (!sec->section_buf) {
347 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
351 MpegTSFilter *filter;
352 MpegTSPESFilter *pes;
354 if (pid >= NB_PID_MAX || ts->pids[pid])
356 filter = av_mallocz(sizeof(MpegTSFilter));
359 ts->pids[pid] = filter;
360 filter->type = MPEGTS_PES;
363 filter->last_cc = -1;
364 pes = &filter->u.pes_filter;
365 pes->pes_cb = pes_cb;
366 pes->opaque = opaque;
370 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
375 if (filter->type == MPEGTS_SECTION)
376 av_freep(&filter->u.section_filter.section_buf);
377 else if (filter->type == MPEGTS_PES) {
378 PESContext *pes = filter->u.pes_filter.opaque;
379 av_freep(&pes->buffer);
380 /* referenced private data will be freed later in
381 * avformat_close_input */
382 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
383 av_freep(&filter->u.pes_filter.opaque);
388 ts->pids[pid] = NULL;
391 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
392 int stat[TS_MAX_PACKET_SIZE];
397 memset(stat, 0, packet_size*sizeof(int));
399 for(x=i=0; i<size-3; i++){
400 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){
402 if(stat[x] > best_score){
409 if(x == packet_size) x= 0;
415 /* autodetect fec presence. Must have at least 1024 bytes */
416 static int get_packet_size(const uint8_t *buf, int size)
418 int score, fec_score, dvhs_score;
420 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
423 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
424 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
425 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
426 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
427 score, dvhs_score, fec_score);
429 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
430 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
431 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
435 typedef struct SectionHeader {
440 uint8_t last_sec_num;
443 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
456 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
462 if ((p + 1) >= p_end)
470 /* read and allocate a DVB string preceded by its length */
471 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
478 len = get8(&p, p_end);
481 if ((p + len) > p_end)
483 str = av_malloc(len + 1);
493 static int parse_section_header(SectionHeader *h,
494 const uint8_t **pp, const uint8_t *p_end)
498 val = get8(pp, p_end);
503 val = get16(pp, p_end);
507 val = get8(pp, p_end);
510 h->version = (val >> 1) & 0x1f;
511 val = get8(pp, p_end);
515 val = get8(pp, p_end);
518 h->last_sec_num = val;
523 uint32_t stream_type;
524 enum AVMediaType codec_type;
525 enum AVCodecID codec_id;
528 static const StreamType ISO_types[] = {
529 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
530 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
531 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
532 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
533 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
534 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
535 /* Makito encoder sets stream type 0x11 for AAC,
536 * so auto-detect LOAS/LATM instead of hardcoding it. */
537 // { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
538 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
539 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
540 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
544 static const StreamType HDMV_types[] = {
545 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
546 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
547 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
548 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
549 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
550 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
551 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
552 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
553 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
554 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
559 static const StreamType MISC_types[] = {
560 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
561 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
565 static const StreamType REGD_types[] = {
566 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
567 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
568 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
569 { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
570 { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
571 { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
572 { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
576 /* descriptor present */
577 static const StreamType DESC_types[] = {
578 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
579 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
580 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
581 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
582 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
586 static void mpegts_find_stream_type(AVStream *st,
587 uint32_t stream_type, const StreamType *types)
589 for (; types->stream_type; types++) {
590 if (stream_type == types->stream_type) {
591 st->codec->codec_type = types->codec_type;
592 st->codec->codec_id = types->codec_id;
593 st->request_probe = 0;
599 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
600 uint32_t stream_type, uint32_t prog_reg_desc)
602 int old_codec_type= st->codec->codec_type;
603 int old_codec_id = st->codec->codec_id;
604 avpriv_set_pts_info(st, 33, 1, 90000);
606 st->codec->codec_type = AVMEDIA_TYPE_DATA;
607 st->codec->codec_id = AV_CODEC_ID_NONE;
608 st->need_parsing = AVSTREAM_PARSE_FULL;
610 pes->stream_type = stream_type;
612 av_log(pes->stream, AV_LOG_DEBUG,
613 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
614 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
616 st->codec->codec_tag = pes->stream_type;
618 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
619 if ((prog_reg_desc == AV_RL32("HDMV") ||
620 prog_reg_desc == AV_RL32("HDPR")) &&
621 st->codec->codec_id == AV_CODEC_ID_NONE) {
622 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
623 if (pes->stream_type == 0x83) {
624 // HDMV TrueHD streams also contain an AC3 coded version of the
625 // audio track - add a second stream for this
627 // priv_data cannot be shared between streams
628 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
630 return AVERROR(ENOMEM);
631 memcpy(sub_pes, pes, sizeof(*sub_pes));
633 sub_st = avformat_new_stream(pes->stream, NULL);
636 return AVERROR(ENOMEM);
639 sub_st->id = pes->pid;
640 avpriv_set_pts_info(sub_st, 33, 1, 90000);
641 sub_st->priv_data = sub_pes;
642 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
643 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
644 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
645 sub_pes->sub_st = pes->sub_st = sub_st;
648 if (st->codec->codec_id == AV_CODEC_ID_NONE)
649 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
650 if (st->codec->codec_id == AV_CODEC_ID_NONE){
651 st->codec->codec_id = old_codec_id;
652 st->codec->codec_type= old_codec_type;
658 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
662 pkt->destruct = av_destruct_packet;
663 pkt->data = pes->buffer;
664 pkt->size = pes->data_index;
666 if(pes->total_size != MAX_PES_PAYLOAD &&
667 pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
668 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
669 pes->flags |= AV_PKT_FLAG_CORRUPT;
671 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
673 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
674 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
675 pkt->stream_index = pes->sub_st->index;
677 pkt->stream_index = pes->st->index;
680 /* store position of first TS packet of this PES packet */
681 pkt->pos = pes->ts_packet_pos;
682 pkt->flags = pes->flags;
684 /* reset pts values */
685 pes->pts = AV_NOPTS_VALUE;
686 pes->dts = AV_NOPTS_VALUE;
692 static uint64_t get_bits64(GetBitContext *gb, int bits)
696 if (get_bits_left(gb) < bits)
697 return AV_NOPTS_VALUE;
700 ret |= get_bits(gb, 17);
704 ret |= get_bits(gb, bits);
708 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
711 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
712 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
713 int dts_flag = -1, cts_flag = -1;
714 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
716 init_get_bits(&gb, buf, buf_size*8);
718 if (sl->use_au_start)
719 au_start_flag = get_bits1(&gb);
721 au_end_flag = get_bits1(&gb);
722 if (!sl->use_au_start && !sl->use_au_end)
723 au_start_flag = au_end_flag = 1;
725 ocr_flag = get_bits1(&gb);
727 idle_flag = get_bits1(&gb);
729 padding_flag = get_bits1(&gb);
731 padding_bits = get_bits(&gb, 3);
733 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
734 if (sl->packet_seq_num_len)
735 skip_bits_long(&gb, sl->packet_seq_num_len);
736 if (sl->degr_prior_len)
738 skip_bits(&gb, sl->degr_prior_len);
740 skip_bits_long(&gb, sl->ocr_len);
742 if (sl->use_rand_acc_pt)
744 if (sl->au_seq_num_len > 0)
745 skip_bits_long(&gb, sl->au_seq_num_len);
746 if (sl->use_timestamps) {
747 dts_flag = get_bits1(&gb);
748 cts_flag = get_bits1(&gb);
751 if (sl->inst_bitrate_len)
752 inst_bitrate_flag = get_bits1(&gb);
754 dts = get_bits64(&gb, sl->timestamp_len);
756 cts = get_bits64(&gb, sl->timestamp_len);
758 skip_bits_long(&gb, sl->au_len);
759 if (inst_bitrate_flag)
760 skip_bits_long(&gb, sl->inst_bitrate_len);
763 if (dts != AV_NOPTS_VALUE)
765 if (cts != AV_NOPTS_VALUE)
768 if (sl->timestamp_len && sl->timestamp_res)
769 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
771 return (get_bits_count(&gb) + 7) >> 3;
774 /* return non zero if a packet could be constructed */
775 static int mpegts_push_data(MpegTSFilter *filter,
776 const uint8_t *buf, int buf_size, int is_start,
779 PESContext *pes = filter->u.pes_filter.opaque;
780 MpegTSContext *ts = pes->ts;
788 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
789 new_pes_packet(pes, ts->pkt);
792 pes->state = MPEGTS_HEADER;
794 pes->ts_packet_pos = pos;
797 while (buf_size > 0) {
800 len = PES_START_SIZE - pes->data_index;
803 memcpy(pes->header + pes->data_index, p, len);
804 pes->data_index += len;
807 if (pes->data_index == PES_START_SIZE) {
808 /* we got all the PES or section header. We can now
810 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
811 pes->header[2] == 0x01) {
812 /* it must be an mpeg2 PES stream */
813 code = pes->header[3] | 0x100;
814 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
816 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
817 (!pes->sub_st || pes->sub_st->discard == AVDISCARD_ALL)) ||
818 code == 0x1be) /* padding_stream */
821 /* stream not present in PMT */
823 pes->st = avformat_new_stream(ts->stream, NULL);
825 return AVERROR(ENOMEM);
826 pes->st->id = pes->pid;
827 mpegts_set_stream_info(pes->st, pes, 0, 0);
830 pes->total_size = AV_RB16(pes->header + 4);
831 /* NOTE: a zero total size means the PES size is
833 if (!pes->total_size)
834 pes->total_size = MAX_PES_PAYLOAD;
836 /* allocate pes buffer */
837 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
839 return AVERROR(ENOMEM);
841 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
842 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
843 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
844 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
845 pes->state = MPEGTS_PESHEADER;
846 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
847 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
848 pes->pid, pes->stream_type);
849 pes->st->request_probe= 1;
852 pes->state = MPEGTS_PAYLOAD;
856 /* otherwise, it should be a table */
859 pes->state = MPEGTS_SKIP;
864 /**********************************************/
865 /* PES packing parsing */
866 case MPEGTS_PESHEADER:
867 len = PES_HEADER_SIZE - pes->data_index;
872 memcpy(pes->header + pes->data_index, p, len);
873 pes->data_index += len;
876 if (pes->data_index == PES_HEADER_SIZE) {
877 pes->pes_header_size = pes->header[8] + 9;
878 pes->state = MPEGTS_PESHEADER_FILL;
881 case MPEGTS_PESHEADER_FILL:
882 len = pes->pes_header_size - pes->data_index;
887 memcpy(pes->header + pes->data_index, p, len);
888 pes->data_index += len;
891 if (pes->data_index == pes->pes_header_size) {
893 unsigned int flags, pes_ext, skip;
895 flags = pes->header[7];
897 pes->pts = AV_NOPTS_VALUE;
898 pes->dts = AV_NOPTS_VALUE;
899 if ((flags & 0xc0) == 0x80) {
900 pes->dts = pes->pts = ff_parse_pes_pts(r);
902 } else if ((flags & 0xc0) == 0xc0) {
903 pes->pts = ff_parse_pes_pts(r);
905 pes->dts = ff_parse_pes_pts(r);
908 pes->extended_stream_id = -1;
909 if (flags & 0x01) { /* PES extension */
911 /* Skip PES private data, program packet sequence counter and P-STD buffer */
912 skip = (pes_ext >> 4) & 0xb;
915 if ((pes_ext & 0x41) == 0x01 &&
916 (r + 2) <= (pes->header + pes->pes_header_size)) {
917 /* PES extension 2 */
918 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
919 pes->extended_stream_id = r[1];
923 /* we got the full header. We parse it and get the payload */
924 pes->state = MPEGTS_PAYLOAD;
926 if (pes->stream_type == 0x12 && buf_size > 0) {
927 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
928 pes->pes_header_size += sl_header_bytes;
929 p += sl_header_bytes;
930 buf_size -= sl_header_bytes;
935 if (buf_size > 0 && pes->buffer) {
936 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
937 new_pes_packet(pes, ts->pkt);
938 pes->total_size = MAX_PES_PAYLOAD;
939 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
941 return AVERROR(ENOMEM);
943 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
944 // pes packet size is < ts size packet and pes data is padded with 0xff
945 // not sure if this is legal in ts but see issue #2392
946 buf_size = pes->total_size;
948 memcpy(pes->buffer+pes->data_index, p, buf_size);
949 pes->data_index += buf_size;
952 /* emit complete packets with known packet size
953 * decreases demuxer delay for infrequent packets like subtitles from
954 * a couple of seconds to milliseconds for properly muxed files.
955 * total_size is the number of bytes following pes_packet_length
956 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
957 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
958 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
960 new_pes_packet(pes, ts->pkt);
972 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
977 /* if no pid found, then add a pid context */
978 pes = av_mallocz(sizeof(PESContext));
982 pes->stream = ts->stream;
984 pes->pcr_pid = pcr_pid;
985 pes->state = MPEGTS_SKIP;
986 pes->pts = AV_NOPTS_VALUE;
987 pes->dts = AV_NOPTS_VALUE;
988 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1001 Mp4Descr *active_descr;
1003 int max_descr_count;
1005 } MP4DescrParseContext;
1007 static int init_MP4DescrParseContext(
1008 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
1009 unsigned size, Mp4Descr *descr, int max_descr_count)
1013 return AVERROR_INVALIDDATA;
1015 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
1016 NULL, NULL, NULL, NULL)) < 0)
1023 d->active_descr = NULL;
1024 d->max_descr_count = max_descr_count;
1029 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
1030 int64_t new_off = avio_tell(pb);
1031 (*len) -= new_off - *off;
1035 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1038 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1041 if (parse_mp4_descr(d, off, len, 0) < 0)
1043 update_offsets(&d->pb, &off, &len);
1048 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1050 avio_rb16(&d->pb); // ID
1056 update_offsets(&d->pb, &off, &len);
1057 return parse_mp4_descr_arr(d, off, len);
1060 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1065 id_flags = avio_rb16(&d->pb);
1066 if (!(id_flags & 0x0020)) { //URL_Flag
1067 update_offsets(&d->pb, &off, &len);
1068 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1074 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1077 if (d->descr_count >= d->max_descr_count)
1079 ff_mp4_parse_es_descr(&d->pb, &es_id);
1080 d->active_descr = d->descr + (d->descr_count++);
1082 d->active_descr->es_id = es_id;
1083 update_offsets(&d->pb, &off, &len);
1084 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1085 update_offsets(&d->pb, &off, &len);
1087 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1088 d->active_descr = NULL;
1092 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1094 Mp4Descr *descr = d->active_descr;
1097 d->active_descr->dec_config_descr = av_malloc(len);
1098 if (!descr->dec_config_descr)
1099 return AVERROR(ENOMEM);
1100 descr->dec_config_descr_len = len;
1101 avio_read(&d->pb, descr->dec_config_descr, len);
1105 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1107 Mp4Descr *descr = d->active_descr;
1112 predefined = avio_r8(&d->pb);
1115 int flags = avio_r8(&d->pb);
1116 descr->sl.use_au_start = !!(flags & 0x80);
1117 descr->sl.use_au_end = !!(flags & 0x40);
1118 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1119 descr->sl.use_padding = !!(flags & 0x08);
1120 descr->sl.use_timestamps = !!(flags & 0x04);
1121 descr->sl.use_idle = !!(flags & 0x02);
1122 descr->sl.timestamp_res = avio_rb32(&d->pb);
1124 descr->sl.timestamp_len = avio_r8(&d->pb);
1125 descr->sl.ocr_len = avio_r8(&d->pb);
1126 descr->sl.au_len = avio_r8(&d->pb);
1127 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1128 lengths = avio_rb16(&d->pb);
1129 descr->sl.degr_prior_len = lengths >> 12;
1130 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1131 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1133 av_log_missing_feature(d->s, "Predefined SLConfigDescriptor", 0);
1138 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1141 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1142 update_offsets(&d->pb, &off, &len);
1143 if (len < 0 || len1 > len || len1 <= 0) {
1144 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1148 if (d->level++ >= MAX_LEVEL) {
1149 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1153 if (target_tag && tag != target_tag) {
1154 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1160 parse_MP4IODescrTag(d, off, len1);
1163 parse_MP4ODescrTag(d, off, len1);
1166 parse_MP4ESDescrTag(d, off, len1);
1168 case MP4DecConfigDescrTag:
1169 parse_MP4DecConfigDescrTag(d, off, len1);
1172 parse_MP4SLDescrTag(d, off, len1);
1178 avio_seek(&d->pb, off + len1, SEEK_SET);
1182 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1183 Mp4Descr *descr, int *descr_count, int max_descr_count)
1185 MP4DescrParseContext d;
1186 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1189 parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1191 *descr_count = d.descr_count;
1195 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1196 Mp4Descr *descr, int *descr_count, int max_descr_count)
1198 MP4DescrParseContext d;
1199 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1202 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1204 *descr_count = d.descr_count;
1208 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1210 MpegTSContext *ts = filter->u.section_filter.opaque;
1212 const uint8_t *p, *p_end;
1214 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1215 int mp4_descr_count = 0;
1217 AVFormatContext *s = ts->stream;
1219 p_end = section + section_len - 4;
1221 if (parse_section_header(&h, &p, p_end) < 0)
1223 if (h.tid != M4OD_TID)
1226 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1228 for (pid = 0; pid < NB_PID_MAX; pid++) {
1231 for (i = 0; i < mp4_descr_count; i++) {
1234 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1236 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1237 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1240 pes = ts->pids[pid]->u.pes_filter.opaque;
1246 pes->sl = mp4_descr[i].sl;
1248 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1249 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1250 ff_mp4_read_dec_config_descr(s, st, &pb);
1251 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1252 st->codec->extradata_size > 0)
1253 st->need_parsing = 0;
1254 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1255 st->codec->extradata_size > 0)
1256 st->need_parsing = 0;
1258 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1259 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO) {
1260 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1261 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE) {
1262 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1263 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN) {
1264 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1268 for (i = 0; i < mp4_descr_count; i++)
1269 av_free(mp4_descr[i].dec_config_descr);
1272 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1273 const uint8_t **pp, const uint8_t *desc_list_end,
1274 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1277 const uint8_t *desc_end;
1278 int desc_len, desc_tag, desc_es_id;
1282 desc_tag = get8(pp, desc_list_end);
1285 desc_len = get8(pp, desc_list_end);
1288 desc_end = *pp + desc_len;
1289 if (desc_end > desc_list_end)
1292 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1294 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1295 stream_type == STREAM_TYPE_PRIVATE_DATA)
1296 mpegts_find_stream_type(st, desc_tag, DESC_types);
1299 case 0x1E: /* SL descriptor */
1300 desc_es_id = get16(pp, desc_end);
1301 if (ts && ts->pids[pid])
1302 ts->pids[pid]->es_id = desc_es_id;
1303 for (i = 0; i < mp4_descr_count; i++)
1304 if (mp4_descr[i].dec_config_descr_len &&
1305 mp4_descr[i].es_id == desc_es_id) {
1307 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1308 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1309 ff_mp4_read_dec_config_descr(fc, st, &pb);
1310 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1311 st->codec->extradata_size > 0)
1312 st->need_parsing = 0;
1313 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1314 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1317 case 0x1F: /* FMC descriptor */
1318 get16(pp, desc_end);
1319 if (mp4_descr_count > 0 && (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe>0) &&
1320 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1322 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1323 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1324 ff_mp4_read_dec_config_descr(fc, st, &pb);
1325 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1326 st->codec->extradata_size > 0){
1327 st->request_probe= st->need_parsing = 0;
1328 st->codec->codec_type= AVMEDIA_TYPE_AUDIO;
1332 case 0x56: /* DVB teletext descriptor */
1333 language[0] = get8(pp, desc_end);
1334 language[1] = get8(pp, desc_end);
1335 language[2] = get8(pp, desc_end);
1337 av_dict_set(&st->metadata, "language", language, 0);
1339 case 0x59: /* subtitling descriptor */
1340 language[0] = get8(pp, desc_end);
1341 language[1] = get8(pp, desc_end);
1342 language[2] = get8(pp, desc_end);
1344 /* hearing impaired subtitles detection */
1345 switch(get8(pp, desc_end)) {
1346 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1347 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1348 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1349 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1350 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1351 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1352 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1355 if (st->codec->extradata) {
1356 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1357 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1359 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1360 if (st->codec->extradata) {
1361 st->codec->extradata_size = 4;
1362 memcpy(st->codec->extradata, *pp, 4);
1366 av_dict_set(&st->metadata, "language", language, 0);
1368 case 0x0a: /* ISO 639 language descriptor */
1369 for (i = 0; i + 4 <= desc_len; i += 4) {
1370 language[i + 0] = get8(pp, desc_end);
1371 language[i + 1] = get8(pp, desc_end);
1372 language[i + 2] = get8(pp, desc_end);
1373 language[i + 3] = ',';
1374 switch (get8(pp, desc_end)) {
1375 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1376 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1377 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1381 language[i - 1] = 0;
1382 av_dict_set(&st->metadata, "language", language, 0);
1385 case 0x05: /* registration descriptor */
1386 st->codec->codec_tag = bytestream_get_le32(pp);
1387 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1388 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1389 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1391 case 0x52: /* stream identifier descriptor */
1392 st->stream_identifier = 1 + get8(pp, desc_end);
1401 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1403 MpegTSContext *ts = filter->u.section_filter.opaque;
1404 SectionHeader h1, *h = &h1;
1407 const uint8_t *p, *p_end, *desc_list_end;
1408 int program_info_length, pcr_pid, pid, stream_type;
1410 uint32_t prog_reg_desc = 0; /* registration descriptor */
1412 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1413 int mp4_descr_count = 0;
1416 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1417 hex_dump_debug(ts->stream, section, section_len);
1419 p_end = section + section_len - 4;
1421 if (parse_section_header(h, &p, p_end) < 0)
1424 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1425 h->id, h->sec_num, h->last_sec_num);
1427 if (h->tid != PMT_TID)
1430 clear_program(ts, h->id);
1431 pcr_pid = get16(&p, p_end);
1435 add_pid_to_pmt(ts, h->id, pcr_pid);
1436 set_pcr_pid(ts->stream, h->id, pcr_pid);
1438 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1440 program_info_length = get16(&p, p_end);
1441 if (program_info_length < 0)
1443 program_info_length &= 0xfff;
1444 while(program_info_length >= 2) {
1446 tag = get8(&p, p_end);
1447 len = get8(&p, p_end);
1449 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1451 if(len > program_info_length - 2)
1452 //something else is broken, exit the program_descriptors_loop
1454 program_info_length -= len + 2;
1455 if (tag == 0x1d) { // IOD descriptor
1456 get8(&p, p_end); // scope
1457 get8(&p, p_end); // label
1459 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1460 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1461 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1462 prog_reg_desc = bytestream_get_le32(&p);
1467 p += program_info_length;
1471 // stop parsing after pmt, we found header
1472 if (!ts->stream->nb_streams)
1478 stream_type = get8(&p, p_end);
1479 if (stream_type < 0)
1481 pid = get16(&p, p_end);
1486 /* now create stream */
1487 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1488 pes = ts->pids[pid]->u.pes_filter.opaque;
1490 pes->st = avformat_new_stream(pes->stream, NULL);
1491 pes->st->id = pes->pid;
1494 } else if (stream_type != 0x13) {
1495 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1496 pes = add_pes_stream(ts, pid, pcr_pid);
1498 st = avformat_new_stream(pes->stream, NULL);
1502 int idx = ff_find_stream_index(ts->stream, pid);
1504 st = ts->stream->streams[idx];
1506 st = avformat_new_stream(ts->stream, NULL);
1508 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1515 if (pes && !pes->stream_type)
1516 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1518 add_pid_to_pmt(ts, h->id, pid);
1520 ff_program_add_stream_index(ts->stream, h->id, st->index);
1522 desc_list_len = get16(&p, p_end);
1523 if (desc_list_len < 0)
1525 desc_list_len &= 0xfff;
1526 desc_list_end = p + desc_list_len;
1527 if (desc_list_end > p_end)
1530 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1531 mp4_descr, mp4_descr_count, pid, ts) < 0)
1534 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1535 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1536 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1543 for (i = 0; i < mp4_descr_count; i++)
1544 av_free(mp4_descr[i].dec_config_descr);
1547 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1549 MpegTSContext *ts = filter->u.section_filter.opaque;
1550 SectionHeader h1, *h = &h1;
1551 const uint8_t *p, *p_end;
1555 av_dlog(ts->stream, "PAT:\n");
1556 hex_dump_debug(ts->stream, section, section_len);
1558 p_end = section + section_len - 4;
1560 if (parse_section_header(h, &p, p_end) < 0)
1562 if (h->tid != PAT_TID)
1565 ts->stream->ts_id = h->id;
1569 sid = get16(&p, p_end);
1572 pmt_pid = get16(&p, p_end);
1577 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1579 if (sid == 0x0000) {
1582 program = av_new_program(ts->stream, sid);
1583 program->program_num = sid;
1584 program->pmt_pid = pmt_pid;
1585 if (ts->pids[pmt_pid])
1586 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1587 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1588 add_pat_entry(ts, sid);
1589 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1590 add_pid_to_pmt(ts, sid, pmt_pid);
1595 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1597 MpegTSContext *ts = filter->u.section_filter.opaque;
1598 SectionHeader h1, *h = &h1;
1599 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1600 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1601 char *name, *provider_name;
1603 av_dlog(ts->stream, "SDT:\n");
1604 hex_dump_debug(ts->stream, section, section_len);
1606 p_end = section + section_len - 4;
1608 if (parse_section_header(h, &p, p_end) < 0)
1610 if (h->tid != SDT_TID)
1612 onid = get16(&p, p_end);
1615 val = get8(&p, p_end);
1619 sid = get16(&p, p_end);
1622 val = get8(&p, p_end);
1625 desc_list_len = get16(&p, p_end);
1626 if (desc_list_len < 0)
1628 desc_list_len &= 0xfff;
1629 desc_list_end = p + desc_list_len;
1630 if (desc_list_end > p_end)
1633 desc_tag = get8(&p, desc_list_end);
1636 desc_len = get8(&p, desc_list_end);
1637 desc_end = p + desc_len;
1638 if (desc_end > desc_list_end)
1641 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1642 desc_tag, desc_len);
1646 service_type = get8(&p, p_end);
1647 if (service_type < 0)
1649 provider_name = getstr8(&p, p_end);
1652 name = getstr8(&p, p_end);
1654 AVProgram *program = av_new_program(ts->stream, sid);
1656 av_dict_set(&program->metadata, "service_name", name, 0);
1657 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1661 av_free(provider_name);
1672 /* handle one TS packet */
1673 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1675 AVFormatContext *s = ts->stream;
1677 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1678 has_adaptation, has_payload;
1679 const uint8_t *p, *p_end;
1682 pid = AV_RB16(packet + 1) & 0x1fff;
1683 if(pid && discard_pid(ts, pid))
1685 is_start = packet[1] & 0x40;
1686 tss = ts->pids[pid];
1687 if (ts->auto_guess && tss == NULL && is_start) {
1688 add_pes_stream(ts, pid, -1);
1689 tss = ts->pids[pid];
1694 afc = (packet[3] >> 4) & 3;
1695 if (afc == 0) /* reserved value */
1697 has_adaptation = afc & 2;
1698 has_payload = afc & 1;
1699 is_discontinuity = has_adaptation
1700 && packet[4] != 0 /* with length > 0 */
1701 && (packet[5] & 0x80); /* and discontinuity indicated */
1703 /* continuity check (currently not used) */
1704 cc = (packet[3] & 0xf);
1705 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1706 cc_ok = pid == 0x1FFF // null packet PID
1709 || expected_cc == cc;
1713 av_log(ts->stream, AV_LOG_DEBUG,
1714 "Continuity check failed for pid %d expected %d got %d\n",
1715 pid, expected_cc, cc);
1716 if(tss->type == MPEGTS_PES) {
1717 PESContext *pc = tss->u.pes_filter.opaque;
1718 pc->flags |= AV_PKT_FLAG_CORRUPT;
1725 if (has_adaptation) {
1726 /* skip adaptation field */
1729 /* if past the end of packet, ignore */
1730 p_end = packet + TS_PACKET_SIZE;
1734 pos = avio_tell(ts->stream->pb);
1735 ts->pos47= pos % ts->raw_packet_size;
1737 if (tss->type == MPEGTS_SECTION) {
1739 /* pointer field present */
1741 if (p + len > p_end)
1744 /* write remaining section bytes */
1745 write_section_data(s, tss,
1747 /* check whether filter has been closed */
1753 write_section_data(s, tss,
1758 write_section_data(s, tss,
1764 // Note: The position here points actually behind the current packet.
1765 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1766 pos - ts->raw_packet_size)) < 0)
1773 /* XXX: try to find a better synchro over several packets (use
1774 get_packet_size() ?) */
1775 static int mpegts_resync(AVFormatContext *s)
1777 AVIOContext *pb = s->pb;
1780 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1785 avio_seek(pb, -1, SEEK_CUR);
1789 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1794 /* return -1 if error or EOF. Return 0 if OK. */
1795 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1797 AVIOContext *pb = s->pb;
1801 len = avio_read(pb, buf, TS_PACKET_SIZE);
1802 if (len != TS_PACKET_SIZE)
1803 return len < 0 ? len : AVERROR_EOF;
1804 /* check packet sync byte */
1805 if (buf[0] != 0x47) {
1806 /* find a new packet start */
1807 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1808 if (mpegts_resync(s) < 0)
1809 return AVERROR(EAGAIN);
1813 skip = raw_packet_size - TS_PACKET_SIZE;
1815 avio_skip(pb, skip);
1822 static int handle_packets(MpegTSContext *ts, int nb_packets)
1824 AVFormatContext *s = ts->stream;
1825 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
1826 int packet_num, ret = 0;
1828 if (avio_tell(s->pb) != ts->last_pos) {
1830 av_dlog(ts->stream, "Skipping after seek\n");
1831 /* seek detected, flush pes buffer */
1832 for (i = 0; i < NB_PID_MAX; i++) {
1834 if (ts->pids[i]->type == MPEGTS_PES) {
1835 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1836 av_freep(&pes->buffer);
1837 pes->data_index = 0;
1838 pes->state = MPEGTS_SKIP; /* skip until pes header */
1840 ts->pids[i]->last_cc = -1;
1847 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1850 if (nb_packets != 0 && packet_num >= nb_packets ||
1851 ts->stop_parse > 1) {
1852 ret = AVERROR(EAGAIN);
1855 if (ts->stop_parse > 0)
1858 ret = read_packet(s, packet, ts->raw_packet_size);
1861 ret = handle_packet(ts, packet);
1865 ts->last_pos = avio_tell(s->pb);
1869 static int mpegts_probe(AVProbeData *p)
1871 const int size= p->buf_size;
1872 int score, fec_score, dvhs_score;
1873 int check_count= size / TS_FEC_PACKET_SIZE;
1874 #define CHECK_COUNT 10
1876 if (check_count < CHECK_COUNT)
1879 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1880 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1881 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1882 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
1883 score, dvhs_score, fec_score);
1885 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1886 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1887 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1888 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1892 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1893 (-1) if not available */
1894 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1895 const uint8_t *packet)
1897 int afc, len, flags;
1901 afc = (packet[3] >> 4) & 3;
1911 if (!(flags & 0x10))
1916 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1917 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1921 static int mpegts_read_header(AVFormatContext *s)
1923 MpegTSContext *ts = s->priv_data;
1924 AVIOContext *pb = s->pb;
1925 uint8_t buf[8*1024]={0};
1929 /* read the first 8192 bytes to get packet size */
1930 pos = avio_tell(pb);
1931 len = avio_read(pb, buf, sizeof(buf));
1932 ts->raw_packet_size = get_packet_size(buf, len);
1933 if (ts->raw_packet_size <= 0) {
1934 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1935 ts->raw_packet_size = TS_PACKET_SIZE;
1940 if (s->iformat == &ff_mpegts_demuxer) {
1943 /* first do a scan to get all the services */
1944 /* NOTE: We attempt to seek on non-seekable files as well, as the
1945 * probe buffer usually is big enough. Only warn if the seek failed
1946 * on files where the seek should work. */
1947 if (avio_seek(pb, pos, SEEK_SET) < 0)
1948 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
1950 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1952 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1954 handle_packets(ts, s->probesize / ts->raw_packet_size);
1955 /* if could not find service, enable auto_guess */
1959 av_dlog(ts->stream, "tuning done\n");
1961 s->ctx_flags |= AVFMTCTX_NOHEADER;
1964 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1965 int64_t pcrs[2], pcr_h;
1966 int packet_count[2];
1967 uint8_t packet[TS_PACKET_SIZE];
1969 /* only read packets */
1971 st = avformat_new_stream(s, NULL);
1974 avpriv_set_pts_info(st, 60, 1, 27000000);
1975 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1976 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
1978 /* we iterate until we find two PCRs to estimate the bitrate */
1983 ret = read_packet(s, packet, ts->raw_packet_size);
1986 pid = AV_RB16(packet + 1) & 0x1fff;
1987 if ((pcr_pid == -1 || pcr_pid == pid) &&
1988 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1990 packet_count[nb_pcrs] = nb_packets;
1991 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1999 /* NOTE1: the bitrate is computed without the FEC */
2000 /* NOTE2: it is only the bitrate of the start of the stream */
2001 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2002 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2003 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
2004 st->codec->bit_rate = s->bit_rate;
2005 st->start_time = ts->cur_pcr;
2006 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2007 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2010 avio_seek(pb, pos, SEEK_SET);
2016 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2018 static int mpegts_raw_read_packet(AVFormatContext *s,
2021 MpegTSContext *ts = s->priv_data;
2023 int64_t pcr_h, next_pcr_h, pos;
2024 int pcr_l, next_pcr_l;
2025 uint8_t pcr_buf[12];
2027 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2028 return AVERROR(ENOMEM);
2029 pkt->pos= avio_tell(s->pb);
2030 ret = read_packet(s, pkt->data, ts->raw_packet_size);
2032 av_free_packet(pkt);
2035 if (ts->mpeg2ts_compute_pcr) {
2036 /* compute exact PCR for each packet */
2037 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2038 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2039 pos = avio_tell(s->pb);
2040 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
2041 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2042 avio_read(s->pb, pcr_buf, 12);
2043 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2044 /* XXX: not precise enough */
2045 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2050 avio_seek(s->pb, pos, SEEK_SET);
2051 /* no next PCR found: we use previous increment */
2052 ts->cur_pcr = pcr_h * 300 + pcr_l;
2054 pkt->pts = ts->cur_pcr;
2055 pkt->duration = ts->pcr_incr;
2056 ts->cur_pcr += ts->pcr_incr;
2058 pkt->stream_index = 0;
2062 static int mpegts_read_packet(AVFormatContext *s,
2065 MpegTSContext *ts = s->priv_data;
2070 ret = handle_packets(ts, 0);
2072 av_free_packet(ts->pkt);
2073 /* flush pes data left */
2074 for (i = 0; i < NB_PID_MAX; i++) {
2075 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2076 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2077 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2078 new_pes_packet(pes, pkt);
2079 pes->state = MPEGTS_SKIP;
2087 if (!ret && pkt->size < 0)
2088 ret = AVERROR(EINTR);
2092 static int mpegts_read_close(AVFormatContext *s)
2094 MpegTSContext *ts = s->priv_data;
2099 for(i=0;i<NB_PID_MAX;i++)
2100 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2105 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2106 int64_t *ppos, int64_t pos_limit)
2108 MpegTSContext *ts = s->priv_data;
2109 int64_t pos, timestamp;
2110 uint8_t buf[TS_PACKET_SIZE];
2111 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2112 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2113 while(pos < pos_limit) {
2114 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2115 return AV_NOPTS_VALUE;
2116 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2117 return AV_NOPTS_VALUE;
2118 if (buf[0] != 0x47) {
2119 if (mpegts_resync(s) < 0)
2120 return AV_NOPTS_VALUE;
2121 pos = avio_tell(s->pb);
2124 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2125 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2129 pos += ts->raw_packet_size;
2132 return AV_NOPTS_VALUE;
2135 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2136 int64_t *ppos, int64_t pos_limit)
2138 MpegTSContext *ts = s->priv_data;
2140 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2141 ff_read_frame_flush(s);
2142 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2143 return AV_NOPTS_VALUE;
2144 while(pos < pos_limit) {
2147 av_init_packet(&pkt);
2148 ret= av_read_frame(s, &pkt);
2150 return AV_NOPTS_VALUE;
2151 av_free_packet(&pkt);
2152 if(pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0){
2153 ff_reduce_index(s, pkt.stream_index);
2154 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2155 if(pkt.stream_index == stream_index){
2163 return AV_NOPTS_VALUE;
2166 /**************************************************************/
2167 /* parsing functions - called from other demuxers such as RTP */
2169 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2173 ts = av_mallocz(sizeof(MpegTSContext));
2176 /* no stream case, currently used by RTP */
2177 ts->raw_packet_size = TS_PACKET_SIZE;
2180 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2181 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2186 /* return the consumed length if a packet was output, or -1 if no
2188 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2189 const uint8_t *buf, int len)
2197 if (len < TS_PACKET_SIZE)
2199 if (buf[0] != 0x47) {
2203 handle_packet(ts, buf);
2204 buf += TS_PACKET_SIZE;
2205 len -= TS_PACKET_SIZE;
2206 if (ts->stop_parse == 1)
2213 void ff_mpegts_parse_close(MpegTSContext *ts)
2217 for(i=0;i<NB_PID_MAX;i++)
2218 av_free(ts->pids[i]);
2222 AVInputFormat ff_mpegts_demuxer = {
2224 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2225 .priv_data_size = sizeof(MpegTSContext),
2226 .read_probe = mpegts_probe,
2227 .read_header = mpegts_read_header,
2228 .read_packet = mpegts_read_packet,
2229 .read_close = mpegts_read_close,
2230 .read_timestamp = mpegts_get_dts,
2231 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2234 AVInputFormat ff_mpegtsraw_demuxer = {
2235 .name = "mpegtsraw",
2236 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2237 .priv_data_size = sizeof(MpegTSContext),
2238 .read_header = mpegts_read_header,
2239 .read_packet = mpegts_raw_read_packet,
2240 .read_close = mpegts_read_close,
2241 .read_timestamp = mpegts_get_dts,
2242 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2243 .priv_class = &mpegtsraw_class,