2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavcodec/bytestream.h"
30 #include "libavcodec/get_bits.h"
31 #include "libavcodec/mathops.h"
35 #include "avio_internal.h"
40 /* maximum size in which we look for synchronisation if
41 synchronisation is lost */
42 #define MAX_RESYNC_SIZE 65536
44 #define MAX_PES_PAYLOAD 200*1024
46 #define MAX_MP4_DESCR_COUNT 16
48 enum MpegTSFilterType {
53 typedef struct MpegTSFilter MpegTSFilter;
55 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
57 typedef struct MpegTSPESFilter {
62 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
64 typedef void SetServiceCallback(void *opaque, int ret);
66 typedef struct MpegTSSectionFilter {
70 unsigned int check_crc:1;
71 unsigned int end_of_section_reached:1;
72 SectionCallback *section_cb;
74 } MpegTSSectionFilter;
79 int last_cc; /* last cc code (-1 if first packet) */
80 enum MpegTSFilterType type;
82 MpegTSPESFilter pes_filter;
83 MpegTSSectionFilter section_filter;
87 #define MAX_PIDS_PER_PROGRAM 64
89 unsigned int id; //program id/service id
91 unsigned int pids[MAX_PIDS_PER_PROGRAM];
94 struct MpegTSContext {
97 AVFormatContext *stream;
98 /** raw packet size, including FEC if present */
102 /** position corresponding to pos47, or 0 if pos47 invalid */
105 /** if true, all pids are analyzed to find streams */
108 /** compute exact PCR for each transport stream packet */
109 int mpeg2ts_compute_pcr;
111 int64_t cur_pcr; /**< used to estimate the exact PCR */
112 int pcr_incr; /**< used to estimate the exact PCR */
114 /* data needed to handle file based ts */
115 /** stop parsing loop */
117 /** packet containing Audio/Video data */
119 /** to detect seek */
122 /******************************************/
123 /* private mpegts data */
125 /** structure to keep track of Program->pids mapping */
130 /** filters for various streams specified by PMT + for the PAT and PMT */
131 MpegTSFilter *pids[NB_PID_MAX];
134 static const AVOption options[] = {
135 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
136 {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
140 static const AVClass mpegtsraw_class = {
141 .class_name = "mpegtsraw demuxer",
142 .item_name = av_default_item_name,
144 .version = LIBAVUTIL_VERSION_INT,
147 /* TS stream handling */
152 MPEGTS_PESHEADER_FILL,
157 /* enough for PES header + length */
158 #define PES_START_SIZE 6
159 #define PES_HEADER_SIZE 9
160 #define MAX_PES_HEADER_SIZE (9 + 255)
162 typedef struct PESContext {
164 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
167 AVFormatContext *stream;
169 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
170 enum MpegTSState state;
171 /* used to get the format */
173 int flags; /**< copied to the AVPacket flags */
176 int extended_stream_id;
178 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
179 uint8_t header[MAX_PES_HEADER_SIZE];
184 extern AVInputFormat ff_mpegts_demuxer;
186 static void clear_program(MpegTSContext *ts, unsigned int programid)
190 for(i=0; i<ts->nb_prg; i++)
191 if(ts->prg[i].id == programid)
192 ts->prg[i].nb_pids = 0;
195 static void clear_programs(MpegTSContext *ts)
201 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
204 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
208 p = &ts->prg[ts->nb_prg];
214 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
217 struct Program *p = NULL;
218 for(i=0; i<ts->nb_prg; i++) {
219 if(ts->prg[i].id == programid) {
227 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
229 p->pids[p->nb_pids++] = pid;
233 * @brief discard_pid() decides if the pid is to be discarded according
234 * to caller's programs selection
235 * @param ts : - TS context
237 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
240 static int discard_pid(MpegTSContext *ts, unsigned int pid)
243 int used = 0, discarded = 0;
246 /* If none of the programs have .discard=AVDISCARD_ALL then there's
247 * no way we have to discard this packet
249 for (k = 0; k < ts->stream->nb_programs; k++) {
250 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
253 if (k == ts->stream->nb_programs)
256 for(i=0; i<ts->nb_prg; i++) {
258 for(j=0; j<p->nb_pids; j++) {
259 if(p->pids[j] != pid)
261 //is program with id p->id set to be discarded?
262 for(k=0; k<ts->stream->nb_programs; k++) {
263 if(ts->stream->programs[k]->id == p->id) {
264 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
273 return !used && discarded;
277 * Assemble PES packets out of TS packets, and then call the "section_cb"
278 * function when they are complete.
280 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
281 const uint8_t *buf, int buf_size, int is_start)
283 MpegTSSectionFilter *tss = &tss1->u.section_filter;
287 memcpy(tss->section_buf, buf, buf_size);
288 tss->section_index = buf_size;
289 tss->section_h_size = -1;
290 tss->end_of_section_reached = 0;
292 if (tss->end_of_section_reached)
294 len = 4096 - tss->section_index;
297 memcpy(tss->section_buf + tss->section_index, buf, len);
298 tss->section_index += len;
301 /* compute section length if possible */
302 if (tss->section_h_size == -1 && tss->section_index >= 3) {
303 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
306 tss->section_h_size = len;
309 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
310 tss->end_of_section_reached = 1;
311 if (!tss->check_crc ||
312 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
313 tss->section_buf, tss->section_h_size) == 0)
314 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
318 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
319 SectionCallback *section_cb, void *opaque,
323 MpegTSFilter *filter;
324 MpegTSSectionFilter *sec;
326 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
328 if (pid >= NB_PID_MAX || ts->pids[pid])
330 filter = av_mallocz(sizeof(MpegTSFilter));
333 ts->pids[pid] = filter;
334 filter->type = MPEGTS_SECTION;
337 filter->last_cc = -1;
338 sec = &filter->u.section_filter;
339 sec->section_cb = section_cb;
340 sec->opaque = opaque;
341 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
342 sec->check_crc = check_crc;
343 if (!sec->section_buf) {
350 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
354 MpegTSFilter *filter;
355 MpegTSPESFilter *pes;
357 if (pid >= NB_PID_MAX || ts->pids[pid])
359 filter = av_mallocz(sizeof(MpegTSFilter));
362 ts->pids[pid] = filter;
363 filter->type = MPEGTS_PES;
366 filter->last_cc = -1;
367 pes = &filter->u.pes_filter;
368 pes->pes_cb = pes_cb;
369 pes->opaque = opaque;
373 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
378 if (filter->type == MPEGTS_SECTION)
379 av_freep(&filter->u.section_filter.section_buf);
380 else if (filter->type == MPEGTS_PES) {
381 PESContext *pes = filter->u.pes_filter.opaque;
382 av_buffer_unref(&pes->buffer);
383 /* referenced private data will be freed later in
384 * avformat_close_input */
385 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
386 av_freep(&filter->u.pes_filter.opaque);
391 ts->pids[pid] = NULL;
394 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
395 int stat[TS_MAX_PACKET_SIZE];
400 memset(stat, 0, packet_size*sizeof(int));
402 for(x=i=0; i<size-3; i++){
403 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
405 if(stat[x] > best_score){
412 if(x == packet_size) x= 0;
418 /* autodetect fec presence. Must have at least 1024 bytes */
419 static int get_packet_size(const uint8_t *buf, int size)
421 int score, fec_score, dvhs_score;
423 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
426 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
427 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
428 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
429 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
430 score, dvhs_score, fec_score);
432 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
433 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
434 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
438 typedef struct SectionHeader {
443 uint8_t last_sec_num;
446 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
459 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
465 if ((p + 1) >= p_end)
473 /* read and allocate a DVB string preceded by its length */
474 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
481 len = get8(&p, p_end);
484 if ((p + len) > p_end)
486 str = av_malloc(len + 1);
496 static int parse_section_header(SectionHeader *h,
497 const uint8_t **pp, const uint8_t *p_end)
501 val = get8(pp, p_end);
506 val = get16(pp, p_end);
510 val = get8(pp, p_end);
513 h->version = (val >> 1) & 0x1f;
514 val = get8(pp, p_end);
518 val = get8(pp, p_end);
521 h->last_sec_num = val;
526 uint32_t stream_type;
527 enum AVMediaType codec_type;
528 enum AVCodecID codec_id;
531 static const StreamType ISO_types[] = {
532 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
533 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
534 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
535 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
536 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
537 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
538 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
539 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
540 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
541 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
542 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
546 static const StreamType HDMV_types[] = {
547 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
548 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
549 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
550 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
551 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
552 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
553 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
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;
598 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
599 uint32_t stream_type, uint32_t prog_reg_desc)
601 avpriv_set_pts_info(st, 33, 1, 90000);
603 st->codec->codec_type = AVMEDIA_TYPE_DATA;
604 st->codec->codec_id = AV_CODEC_ID_NONE;
605 st->need_parsing = AVSTREAM_PARSE_FULL;
607 pes->stream_type = stream_type;
609 av_log(pes->stream, AV_LOG_DEBUG,
610 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
611 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
613 st->codec->codec_tag = pes->stream_type;
615 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
616 if (prog_reg_desc == AV_RL32("HDMV") &&
617 st->codec->codec_id == AV_CODEC_ID_NONE) {
618 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
619 if (pes->stream_type == 0x83) {
620 // HDMV TrueHD streams also contain an AC3 coded version of the
621 // audio track - add a second stream for this
623 // priv_data cannot be shared between streams
624 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
626 return AVERROR(ENOMEM);
627 memcpy(sub_pes, pes, sizeof(*sub_pes));
629 sub_st = avformat_new_stream(pes->stream, NULL);
632 return AVERROR(ENOMEM);
635 sub_st->id = pes->pid;
636 avpriv_set_pts_info(sub_st, 33, 1, 90000);
637 sub_st->priv_data = sub_pes;
638 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
639 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
640 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
641 sub_pes->sub_st = pes->sub_st = sub_st;
644 if (st->codec->codec_id == AV_CODEC_ID_NONE)
645 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
650 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
654 pkt->buf = pes->buffer;
655 pkt->data = pes->buffer->data;
656 pkt->size = pes->data_index;
658 if(pes->total_size != MAX_PES_PAYLOAD &&
659 pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
660 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
661 pes->flags |= AV_PKT_FLAG_CORRUPT;
663 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
665 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
666 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
667 pkt->stream_index = pes->sub_st->index;
669 pkt->stream_index = pes->st->index;
672 /* store position of first TS packet of this PES packet */
673 pkt->pos = pes->ts_packet_pos;
674 pkt->flags = pes->flags;
676 /* reset pts values */
677 pes->pts = AV_NOPTS_VALUE;
678 pes->dts = AV_NOPTS_VALUE;
684 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
687 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
688 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
689 int dts_flag = -1, cts_flag = -1;
690 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
691 init_get_bits(&gb, buf, buf_size*8);
693 if (sl->use_au_start)
694 au_start_flag = get_bits1(&gb);
696 au_end_flag = get_bits1(&gb);
697 if (!sl->use_au_start && !sl->use_au_end)
698 au_start_flag = au_end_flag = 1;
700 ocr_flag = get_bits1(&gb);
702 idle_flag = get_bits1(&gb);
704 padding_flag = get_bits1(&gb);
706 padding_bits = get_bits(&gb, 3);
708 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
709 if (sl->packet_seq_num_len)
710 skip_bits_long(&gb, sl->packet_seq_num_len);
711 if (sl->degr_prior_len)
713 skip_bits(&gb, sl->degr_prior_len);
715 skip_bits_long(&gb, sl->ocr_len);
717 if (sl->use_rand_acc_pt)
719 if (sl->au_seq_num_len > 0)
720 skip_bits_long(&gb, sl->au_seq_num_len);
721 if (sl->use_timestamps) {
722 dts_flag = get_bits1(&gb);
723 cts_flag = get_bits1(&gb);
726 if (sl->inst_bitrate_len)
727 inst_bitrate_flag = get_bits1(&gb);
729 dts = get_bits64(&gb, sl->timestamp_len);
731 cts = get_bits64(&gb, sl->timestamp_len);
733 skip_bits_long(&gb, sl->au_len);
734 if (inst_bitrate_flag)
735 skip_bits_long(&gb, sl->inst_bitrate_len);
738 if (dts != AV_NOPTS_VALUE)
740 if (cts != AV_NOPTS_VALUE)
743 if (sl->timestamp_len && sl->timestamp_res)
744 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
746 return (get_bits_count(&gb) + 7) >> 3;
749 /* return non zero if a packet could be constructed */
750 static int mpegts_push_data(MpegTSFilter *filter,
751 const uint8_t *buf, int buf_size, int is_start,
754 PESContext *pes = filter->u.pes_filter.opaque;
755 MpegTSContext *ts = pes->ts;
763 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
764 new_pes_packet(pes, ts->pkt);
767 pes->state = MPEGTS_HEADER;
769 pes->ts_packet_pos = pos;
772 while (buf_size > 0) {
775 len = PES_START_SIZE - pes->data_index;
778 memcpy(pes->header + pes->data_index, p, len);
779 pes->data_index += len;
782 if (pes->data_index == PES_START_SIZE) {
783 /* we got all the PES or section header. We can now
785 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
786 pes->header[2] == 0x01) {
787 /* it must be an mpeg2 PES stream */
788 code = pes->header[3] | 0x100;
789 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
791 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
792 (!pes->sub_st || pes->sub_st->discard == AVDISCARD_ALL)) ||
793 code == 0x1be) /* padding_stream */
796 /* stream not present in PMT */
798 pes->st = avformat_new_stream(ts->stream, NULL);
800 return AVERROR(ENOMEM);
801 pes->st->id = pes->pid;
802 mpegts_set_stream_info(pes->st, pes, 0, 0);
805 pes->total_size = AV_RB16(pes->header + 4);
806 /* NOTE: a zero total size means the PES size is
808 if (!pes->total_size)
809 pes->total_size = MAX_PES_PAYLOAD;
811 /* allocate pes buffer */
812 pes->buffer = av_buffer_alloc(pes->total_size +
813 FF_INPUT_BUFFER_PADDING_SIZE);
815 return AVERROR(ENOMEM);
817 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
818 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
819 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
820 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
821 pes->state = MPEGTS_PESHEADER;
822 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE) {
823 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
824 pes->pid, pes->stream_type);
825 pes->st->codec->codec_id = AV_CODEC_ID_PROBE;
828 pes->state = MPEGTS_PAYLOAD;
832 /* otherwise, it should be a table */
835 pes->state = MPEGTS_SKIP;
840 /**********************************************/
841 /* PES packing parsing */
842 case MPEGTS_PESHEADER:
843 len = PES_HEADER_SIZE - pes->data_index;
848 memcpy(pes->header + pes->data_index, p, len);
849 pes->data_index += len;
852 if (pes->data_index == PES_HEADER_SIZE) {
853 pes->pes_header_size = pes->header[8] + 9;
854 pes->state = MPEGTS_PESHEADER_FILL;
857 case MPEGTS_PESHEADER_FILL:
858 len = pes->pes_header_size - pes->data_index;
863 memcpy(pes->header + pes->data_index, p, len);
864 pes->data_index += len;
867 if (pes->data_index == pes->pes_header_size) {
869 unsigned int flags, pes_ext, skip;
871 flags = pes->header[7];
873 pes->pts = AV_NOPTS_VALUE;
874 pes->dts = AV_NOPTS_VALUE;
875 if ((flags & 0xc0) == 0x80) {
876 pes->dts = pes->pts = ff_parse_pes_pts(r);
878 } else if ((flags & 0xc0) == 0xc0) {
879 pes->pts = ff_parse_pes_pts(r);
881 pes->dts = ff_parse_pes_pts(r);
884 pes->extended_stream_id = -1;
885 if (flags & 0x01) { /* PES extension */
887 /* Skip PES private data, program packet sequence counter and P-STD buffer */
888 skip = (pes_ext >> 4) & 0xb;
891 if ((pes_ext & 0x41) == 0x01 &&
892 (r + 2) <= (pes->header + pes->pes_header_size)) {
893 /* PES extension 2 */
894 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
895 pes->extended_stream_id = r[1];
899 /* we got the full header. We parse it and get the payload */
900 pes->state = MPEGTS_PAYLOAD;
902 if (pes->stream_type == 0x12 && buf_size > 0) {
903 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
904 pes->pes_header_size += sl_header_bytes;
905 p += sl_header_bytes;
906 buf_size -= sl_header_bytes;
911 if (buf_size > 0 && pes->buffer) {
912 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
913 new_pes_packet(pes, ts->pkt);
914 pes->total_size = MAX_PES_PAYLOAD;
915 pes->buffer = av_buffer_alloc(pes->total_size + FF_INPUT_BUFFER_PADDING_SIZE);
917 return AVERROR(ENOMEM);
919 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
920 // pes packet size is < ts size packet and pes data is padded with 0xff
921 // not sure if this is legal in ts but see issue #2392
922 buf_size = pes->total_size;
924 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
925 pes->data_index += buf_size;
928 /* emit complete packets with known packet size
929 * decreases demuxer delay for infrequent packets like subtitles from
930 * a couple of seconds to milliseconds for properly muxed files.
931 * total_size is the number of bytes following pes_packet_length
932 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
933 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
934 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
936 new_pes_packet(pes, ts->pkt);
948 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
953 /* if no pid found, then add a pid context */
954 pes = av_mallocz(sizeof(PESContext));
958 pes->stream = ts->stream;
960 pes->pcr_pid = pcr_pid;
961 pes->state = MPEGTS_SKIP;
962 pes->pts = AV_NOPTS_VALUE;
963 pes->dts = AV_NOPTS_VALUE;
964 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
977 Mp4Descr *active_descr;
981 } MP4DescrParseContext;
983 static int init_MP4DescrParseContext(
984 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
985 unsigned size, Mp4Descr *descr, int max_descr_count)
989 return AVERROR_INVALIDDATA;
991 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
992 NULL, NULL, NULL, NULL)) < 0)
999 d->active_descr = NULL;
1000 d->max_descr_count = max_descr_count;
1005 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
1006 int64_t new_off = avio_tell(pb);
1007 (*len) -= new_off - *off;
1011 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1014 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1017 if (parse_mp4_descr(d, off, len, 0) < 0)
1019 update_offsets(&d->pb, &off, &len);
1024 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1026 avio_rb16(&d->pb); // ID
1032 update_offsets(&d->pb, &off, &len);
1033 return parse_mp4_descr_arr(d, off, len);
1036 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1041 id_flags = avio_rb16(&d->pb);
1042 if (!(id_flags & 0x0020)) { //URL_Flag
1043 update_offsets(&d->pb, &off, &len);
1044 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1050 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1053 if (d->descr_count >= d->max_descr_count)
1055 ff_mp4_parse_es_descr(&d->pb, &es_id);
1056 d->active_descr = d->descr + (d->descr_count++);
1058 d->active_descr->es_id = es_id;
1059 update_offsets(&d->pb, &off, &len);
1060 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1061 update_offsets(&d->pb, &off, &len);
1063 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1064 d->active_descr = NULL;
1068 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1070 Mp4Descr *descr = d->active_descr;
1073 d->active_descr->dec_config_descr = av_malloc(len);
1074 if (!descr->dec_config_descr)
1075 return AVERROR(ENOMEM);
1076 descr->dec_config_descr_len = len;
1077 avio_read(&d->pb, descr->dec_config_descr, len);
1081 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1083 Mp4Descr *descr = d->active_descr;
1088 predefined = avio_r8(&d->pb);
1091 int flags = avio_r8(&d->pb);
1092 descr->sl.use_au_start = !!(flags & 0x80);
1093 descr->sl.use_au_end = !!(flags & 0x40);
1094 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1095 descr->sl.use_padding = !!(flags & 0x08);
1096 descr->sl.use_timestamps = !!(flags & 0x04);
1097 descr->sl.use_idle = !!(flags & 0x02);
1098 descr->sl.timestamp_res = avio_rb32(&d->pb);
1100 descr->sl.timestamp_len = avio_r8(&d->pb);
1101 descr->sl.ocr_len = avio_r8(&d->pb);
1102 descr->sl.au_len = avio_r8(&d->pb);
1103 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1104 lengths = avio_rb16(&d->pb);
1105 descr->sl.degr_prior_len = lengths >> 12;
1106 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1107 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1109 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1114 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1117 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1118 update_offsets(&d->pb, &off, &len);
1119 if (len < 0 || len1 > len || len1 <= 0) {
1120 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1124 if (d->level++ >= MAX_LEVEL) {
1125 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1129 if (target_tag && tag != target_tag) {
1130 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1136 parse_MP4IODescrTag(d, off, len1);
1139 parse_MP4ODescrTag(d, off, len1);
1142 parse_MP4ESDescrTag(d, off, len1);
1144 case MP4DecConfigDescrTag:
1145 parse_MP4DecConfigDescrTag(d, off, len1);
1148 parse_MP4SLDescrTag(d, off, len1);
1154 avio_seek(&d->pb, off + len1, SEEK_SET);
1158 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1159 Mp4Descr *descr, int *descr_count, int max_descr_count)
1161 MP4DescrParseContext d;
1162 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1165 parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1167 *descr_count = d.descr_count;
1171 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1172 Mp4Descr *descr, int *descr_count, int max_descr_count)
1174 MP4DescrParseContext d;
1175 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1178 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1180 *descr_count = d.descr_count;
1184 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1186 MpegTSContext *ts = filter->u.section_filter.opaque;
1188 const uint8_t *p, *p_end;
1190 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1191 int mp4_descr_count = 0;
1193 AVFormatContext *s = ts->stream;
1195 p_end = section + section_len - 4;
1197 if (parse_section_header(&h, &p, p_end) < 0)
1199 if (h.tid != M4OD_TID)
1202 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1204 for (pid = 0; pid < NB_PID_MAX; pid++) {
1207 for (i = 0; i < mp4_descr_count; i++) {
1210 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1212 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1213 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1216 pes = ts->pids[pid]->u.pes_filter.opaque;
1222 pes->sl = mp4_descr[i].sl;
1224 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1225 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1226 ff_mp4_read_dec_config_descr(s, st, &pb);
1227 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1228 st->codec->extradata_size > 0)
1229 st->need_parsing = 0;
1230 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1231 st->codec->extradata_size > 0)
1232 st->need_parsing = 0;
1234 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1235 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO) {
1236 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1237 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE) {
1238 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1239 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN) {
1240 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1244 for (i = 0; i < mp4_descr_count; i++)
1245 av_free(mp4_descr[i].dec_config_descr);
1248 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1249 const uint8_t **pp, const uint8_t *desc_list_end,
1250 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1253 const uint8_t *desc_end;
1254 int desc_len, desc_tag, desc_es_id;
1258 desc_tag = get8(pp, desc_list_end);
1261 desc_len = get8(pp, desc_list_end);
1264 desc_end = *pp + desc_len;
1265 if (desc_end > desc_list_end)
1268 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1270 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1271 stream_type == STREAM_TYPE_PRIVATE_DATA)
1272 mpegts_find_stream_type(st, desc_tag, DESC_types);
1275 case 0x1E: /* SL descriptor */
1276 desc_es_id = get16(pp, desc_end);
1277 if (ts && ts->pids[pid])
1278 ts->pids[pid]->es_id = desc_es_id;
1279 for (i = 0; i < mp4_descr_count; i++)
1280 if (mp4_descr[i].dec_config_descr_len &&
1281 mp4_descr[i].es_id == desc_es_id) {
1283 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1284 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1285 ff_mp4_read_dec_config_descr(fc, st, &pb);
1286 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1287 st->codec->extradata_size > 0)
1288 st->need_parsing = 0;
1289 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1290 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1293 case 0x1F: /* FMC descriptor */
1294 get16(pp, desc_end);
1295 if (mp4_descr_count > 0 && st->codec->codec_id == AV_CODEC_ID_AAC_LATM &&
1296 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1298 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1299 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1300 ff_mp4_read_dec_config_descr(fc, st, &pb);
1301 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1302 st->codec->extradata_size > 0)
1303 st->need_parsing = 0;
1306 case 0x56: /* DVB teletext descriptor */
1307 language[0] = get8(pp, desc_end);
1308 language[1] = get8(pp, desc_end);
1309 language[2] = get8(pp, desc_end);
1311 av_dict_set(&st->metadata, "language", language, 0);
1313 case 0x59: /* subtitling descriptor */
1314 language[0] = get8(pp, desc_end);
1315 language[1] = get8(pp, desc_end);
1316 language[2] = get8(pp, desc_end);
1318 /* hearing impaired subtitles detection */
1319 switch(get8(pp, desc_end)) {
1320 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1321 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1322 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1323 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1324 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1325 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1326 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1329 if (st->codec->extradata) {
1330 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1331 avpriv_request_sample(fc, "DVB sub with multiple IDs");
1333 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1334 if (st->codec->extradata) {
1335 st->codec->extradata_size = 4;
1336 memcpy(st->codec->extradata, *pp, 4);
1340 av_dict_set(&st->metadata, "language", language, 0);
1342 case 0x0a: /* ISO 639 language descriptor */
1343 for (i = 0; i + 4 <= desc_len; i += 4) {
1344 language[i + 0] = get8(pp, desc_end);
1345 language[i + 1] = get8(pp, desc_end);
1346 language[i + 2] = get8(pp, desc_end);
1347 language[i + 3] = ',';
1348 switch (get8(pp, desc_end)) {
1349 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1350 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1351 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1355 language[i - 1] = 0;
1356 av_dict_set(&st->metadata, "language", language, 0);
1359 case 0x05: /* registration descriptor */
1360 st->codec->codec_tag = bytestream_get_le32(pp);
1361 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1362 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1363 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1372 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1374 MpegTSContext *ts = filter->u.section_filter.opaque;
1375 SectionHeader h1, *h = &h1;
1378 const uint8_t *p, *p_end, *desc_list_end;
1379 int program_info_length, pcr_pid, pid, stream_type;
1381 uint32_t prog_reg_desc = 0; /* registration descriptor */
1383 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1384 int mp4_descr_count = 0;
1387 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1388 hex_dump_debug(ts->stream, section, section_len);
1390 p_end = section + section_len - 4;
1392 if (parse_section_header(h, &p, p_end) < 0)
1395 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1396 h->id, h->sec_num, h->last_sec_num);
1398 if (h->tid != PMT_TID)
1401 clear_program(ts, h->id);
1402 pcr_pid = get16(&p, p_end);
1406 add_pid_to_pmt(ts, h->id, pcr_pid);
1408 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1410 program_info_length = get16(&p, p_end);
1411 if (program_info_length < 0)
1413 program_info_length &= 0xfff;
1414 while(program_info_length >= 2) {
1416 tag = get8(&p, p_end);
1417 len = get8(&p, p_end);
1419 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1421 if(len > program_info_length - 2)
1422 //something else is broken, exit the program_descriptors_loop
1424 program_info_length -= len + 2;
1425 if (tag == 0x1d) { // IOD descriptor
1426 get8(&p, p_end); // scope
1427 get8(&p, p_end); // label
1429 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1430 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1431 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1432 prog_reg_desc = bytestream_get_le32(&p);
1437 p += program_info_length;
1441 // stop parsing after pmt, we found header
1442 if (!ts->stream->nb_streams)
1448 stream_type = get8(&p, p_end);
1449 if (stream_type < 0)
1451 pid = get16(&p, p_end);
1456 /* now create stream */
1457 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1458 pes = ts->pids[pid]->u.pes_filter.opaque;
1460 pes->st = avformat_new_stream(pes->stream, NULL);
1461 pes->st->id = pes->pid;
1464 } else if (stream_type != 0x13) {
1465 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1466 pes = add_pes_stream(ts, pid, pcr_pid);
1468 st = avformat_new_stream(pes->stream, NULL);
1472 int idx = ff_find_stream_index(ts->stream, pid);
1474 st = ts->stream->streams[idx];
1476 st = avformat_new_stream(ts->stream, NULL);
1478 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1485 if (pes && !pes->stream_type)
1486 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1488 add_pid_to_pmt(ts, h->id, pid);
1490 ff_program_add_stream_index(ts->stream, h->id, st->index);
1492 desc_list_len = get16(&p, p_end);
1493 if (desc_list_len < 0)
1495 desc_list_len &= 0xfff;
1496 desc_list_end = p + desc_list_len;
1497 if (desc_list_end > p_end)
1500 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1501 mp4_descr, mp4_descr_count, pid, ts) < 0)
1504 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1505 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1506 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1513 for (i = 0; i < mp4_descr_count; i++)
1514 av_free(mp4_descr[i].dec_config_descr);
1517 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1519 MpegTSContext *ts = filter->u.section_filter.opaque;
1520 SectionHeader h1, *h = &h1;
1521 const uint8_t *p, *p_end;
1524 av_dlog(ts->stream, "PAT:\n");
1525 hex_dump_debug(ts->stream, section, section_len);
1527 p_end = section + section_len - 4;
1529 if (parse_section_header(h, &p, p_end) < 0)
1531 if (h->tid != PAT_TID)
1536 sid = get16(&p, p_end);
1539 pmt_pid = get16(&p, p_end);
1544 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1546 if (sid == 0x0000) {
1549 av_new_program(ts->stream, sid);
1550 if (ts->pids[pmt_pid])
1551 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1552 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1553 add_pat_entry(ts, sid);
1554 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1555 add_pid_to_pmt(ts, sid, pmt_pid);
1560 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1562 MpegTSContext *ts = filter->u.section_filter.opaque;
1563 SectionHeader h1, *h = &h1;
1564 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1565 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1566 char *name, *provider_name;
1568 av_dlog(ts->stream, "SDT:\n");
1569 hex_dump_debug(ts->stream, section, section_len);
1571 p_end = section + section_len - 4;
1573 if (parse_section_header(h, &p, p_end) < 0)
1575 if (h->tid != SDT_TID)
1577 onid = get16(&p, p_end);
1580 val = get8(&p, p_end);
1584 sid = get16(&p, p_end);
1587 val = get8(&p, p_end);
1590 desc_list_len = get16(&p, p_end);
1591 if (desc_list_len < 0)
1593 desc_list_len &= 0xfff;
1594 desc_list_end = p + desc_list_len;
1595 if (desc_list_end > p_end)
1598 desc_tag = get8(&p, desc_list_end);
1601 desc_len = get8(&p, desc_list_end);
1602 desc_end = p + desc_len;
1603 if (desc_end > desc_list_end)
1606 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1607 desc_tag, desc_len);
1611 service_type = get8(&p, p_end);
1612 if (service_type < 0)
1614 provider_name = getstr8(&p, p_end);
1617 name = getstr8(&p, p_end);
1619 AVProgram *program = av_new_program(ts->stream, sid);
1621 av_dict_set(&program->metadata, "service_name", name, 0);
1622 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1626 av_free(provider_name);
1637 /* handle one TS packet */
1638 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1640 AVFormatContext *s = ts->stream;
1642 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1643 has_adaptation, has_payload;
1644 const uint8_t *p, *p_end;
1647 pid = AV_RB16(packet + 1) & 0x1fff;
1648 if(pid && discard_pid(ts, pid))
1650 is_start = packet[1] & 0x40;
1651 tss = ts->pids[pid];
1652 if (ts->auto_guess && tss == NULL && is_start) {
1653 add_pes_stream(ts, pid, -1);
1654 tss = ts->pids[pid];
1659 afc = (packet[3] >> 4) & 3;
1660 if (afc == 0) /* reserved value */
1662 has_adaptation = afc & 2;
1663 has_payload = afc & 1;
1664 is_discontinuity = has_adaptation
1665 && packet[4] != 0 /* with length > 0 */
1666 && (packet[5] & 0x80); /* and discontinuity indicated */
1668 /* continuity check (currently not used) */
1669 cc = (packet[3] & 0xf);
1670 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1671 cc_ok = pid == 0x1FFF // null packet PID
1674 || expected_cc == cc;
1678 av_log(ts->stream, AV_LOG_WARNING,
1679 "Continuity check failed for pid %d expected %d got %d\n",
1680 pid, expected_cc, cc);
1681 if(tss->type == MPEGTS_PES) {
1682 PESContext *pc = tss->u.pes_filter.opaque;
1683 pc->flags |= AV_PKT_FLAG_CORRUPT;
1690 if (has_adaptation) {
1691 /* skip adaptation field */
1694 /* if past the end of packet, ignore */
1695 p_end = packet + TS_PACKET_SIZE;
1699 pos = avio_tell(ts->stream->pb);
1700 MOD_UNLIKELY(ts->pos47, pos, ts->raw_packet_size, ts->pos);
1702 if (tss->type == MPEGTS_SECTION) {
1704 /* pointer field present */
1706 if (p + len > p_end)
1709 /* write remaining section bytes */
1710 write_section_data(s, tss,
1712 /* check whether filter has been closed */
1718 write_section_data(s, tss,
1723 write_section_data(s, tss,
1729 // Note: The position here points actually behind the current packet.
1730 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1731 pos - ts->raw_packet_size)) < 0)
1738 /* XXX: try to find a better synchro over several packets (use
1739 get_packet_size() ?) */
1740 static int mpegts_resync(AVFormatContext *s)
1742 AVIOContext *pb = s->pb;
1745 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1747 if (pb->eof_reached)
1750 avio_seek(pb, -1, SEEK_CUR);
1754 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1759 /* return -1 if error or EOF. Return 0 if OK. */
1760 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size, uint8_t **data)
1762 AVIOContext *pb = s->pb;
1766 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
1767 if (len != TS_PACKET_SIZE)
1768 return len < 0 ? len : AVERROR_EOF;
1769 /* check packet sync byte */
1770 if ((*data)[0] != 0x47) {
1771 /* find a new packet start */
1772 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1773 if (mpegts_resync(s) < 0)
1774 return AVERROR(EAGAIN);
1784 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
1786 AVIOContext *pb = s->pb;
1787 int skip = raw_packet_size - TS_PACKET_SIZE;
1789 avio_skip(pb, skip);
1792 static int handle_packets(MpegTSContext *ts, int nb_packets)
1794 AVFormatContext *s = ts->stream;
1795 uint8_t packet[TS_PACKET_SIZE+FF_INPUT_BUFFER_PADDING_SIZE];
1797 int packet_num, ret = 0;
1799 if (avio_tell(s->pb) != ts->last_pos) {
1801 av_dlog(ts->stream, "Skipping after seek\n");
1802 /* seek detected, flush pes buffer */
1803 for (i = 0; i < NB_PID_MAX; i++) {
1805 if (ts->pids[i]->type == MPEGTS_PES) {
1806 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1807 av_buffer_unref(&pes->buffer);
1808 pes->data_index = 0;
1809 pes->state = MPEGTS_SKIP; /* skip until pes header */
1811 ts->pids[i]->last_cc = -1;
1818 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1820 if (ts->stop_parse>0)
1823 if (nb_packets != 0 && packet_num >= nb_packets)
1825 ret = read_packet(s, packet, ts->raw_packet_size, &data);
1828 ret = handle_packet(ts, data);
1829 finished_reading_packet(s, ts->raw_packet_size);
1833 ts->last_pos = avio_tell(s->pb);
1837 static int mpegts_probe(AVProbeData *p)
1839 const int size= p->buf_size;
1840 int score, fec_score, dvhs_score;
1841 int check_count= size / TS_FEC_PACKET_SIZE;
1842 #define CHECK_COUNT 10
1844 if (check_count < CHECK_COUNT)
1847 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1848 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1849 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1850 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
1851 score, dvhs_score, fec_score);
1853 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1854 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1855 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1856 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1860 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1861 (-1) if not available */
1862 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1863 const uint8_t *packet)
1865 int afc, len, flags;
1869 afc = (packet[3] >> 4) & 3;
1879 if (!(flags & 0x10))
1884 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1885 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1889 static int mpegts_read_header(AVFormatContext *s)
1891 MpegTSContext *ts = s->priv_data;
1892 AVIOContext *pb = s->pb;
1893 uint8_t buf[5*1024];
1897 /* read the first 1024 bytes to get packet size */
1898 pos = avio_tell(pb);
1899 len = avio_read(pb, buf, sizeof(buf));
1900 if (len != sizeof(buf))
1902 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1903 if (ts->raw_packet_size <= 0)
1908 if (s->iformat == &ff_mpegts_demuxer) {
1911 /* first do a scan to get all the services */
1912 if (avio_seek(pb, pos, SEEK_SET) < 0 && pb->seekable)
1913 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1915 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1917 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1919 handle_packets(ts, s->probesize / ts->raw_packet_size);
1920 /* if could not find service, enable auto_guess */
1924 av_dlog(ts->stream, "tuning done\n");
1926 s->ctx_flags |= AVFMTCTX_NOHEADER;
1929 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1930 int64_t pcrs[2], pcr_h;
1931 int packet_count[2];
1932 uint8_t packet[TS_PACKET_SIZE];
1935 /* only read packets */
1937 st = avformat_new_stream(s, NULL);
1940 avpriv_set_pts_info(st, 60, 1, 27000000);
1941 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1942 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
1944 /* we iterate until we find two PCRs to estimate the bitrate */
1949 ret = read_packet(s, packet, ts->raw_packet_size, &data);
1952 pid = AV_RB16(data + 1) & 0x1fff;
1953 if ((pcr_pid == -1 || pcr_pid == pid) &&
1954 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
1955 finished_reading_packet(s, ts->raw_packet_size);
1957 packet_count[nb_pcrs] = nb_packets;
1958 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1963 finished_reading_packet(s, ts->raw_packet_size);
1968 /* NOTE1: the bitrate is computed without the FEC */
1969 /* NOTE2: it is only the bitrate of the start of the stream */
1970 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1971 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1972 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1973 st->codec->bit_rate = s->bit_rate;
1974 st->start_time = ts->cur_pcr;
1975 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1976 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1979 avio_seek(pb, pos, SEEK_SET);
1985 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1987 static int mpegts_raw_read_packet(AVFormatContext *s,
1990 MpegTSContext *ts = s->priv_data;
1992 int64_t pcr_h, next_pcr_h, pos;
1993 int pcr_l, next_pcr_l;
1994 uint8_t pcr_buf[12];
1997 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1998 return AVERROR(ENOMEM);
1999 pkt->pos= avio_tell(s->pb);
2000 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2002 av_free_packet(pkt);
2005 if (data != pkt->data)
2006 memcpy(pkt->data, data, ts->raw_packet_size);
2007 finished_reading_packet(s, ts->raw_packet_size);
2008 if (ts->mpeg2ts_compute_pcr) {
2009 /* compute exact PCR for each packet */
2010 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2011 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2012 pos = avio_tell(s->pb);
2013 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
2014 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2015 avio_read(s->pb, pcr_buf, 12);
2016 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2017 /* XXX: not precise enough */
2018 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2023 avio_seek(s->pb, pos, SEEK_SET);
2024 /* no next PCR found: we use previous increment */
2025 ts->cur_pcr = pcr_h * 300 + pcr_l;
2027 pkt->pts = ts->cur_pcr;
2028 pkt->duration = ts->pcr_incr;
2029 ts->cur_pcr += ts->pcr_incr;
2031 pkt->stream_index = 0;
2035 static int mpegts_read_packet(AVFormatContext *s,
2038 MpegTSContext *ts = s->priv_data;
2043 ret = handle_packets(ts, 0);
2045 /* flush pes data left */
2046 for (i = 0; i < NB_PID_MAX; i++) {
2047 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2048 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2049 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2050 new_pes_packet(pes, pkt);
2051 pes->state = MPEGTS_SKIP;
2059 if (!ret && pkt->size < 0)
2060 ret = AVERROR(EINTR);
2064 static void mpegts_free(MpegTSContext *ts)
2070 for(i=0;i<NB_PID_MAX;i++)
2071 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2074 static int mpegts_read_close(AVFormatContext *s)
2076 MpegTSContext *ts = s->priv_data;
2081 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2082 int64_t *ppos, int64_t pos_limit)
2084 MpegTSContext *ts = s->priv_data;
2085 int64_t pos, timestamp;
2086 uint8_t buf[TS_PACKET_SIZE];
2087 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2088 const int find_next= 1;
2089 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2092 avio_seek(s->pb, pos, SEEK_SET);
2093 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2094 return AV_NOPTS_VALUE;
2095 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2096 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2099 pos += ts->raw_packet_size;
2103 pos -= ts->raw_packet_size;
2105 return AV_NOPTS_VALUE;
2106 avio_seek(s->pb, pos, SEEK_SET);
2107 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2108 return AV_NOPTS_VALUE;
2109 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2110 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2120 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
2121 MpegTSContext *ts = s->priv_data;
2122 uint8_t buf[TS_PACKET_SIZE];
2125 if (ff_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
2128 pos= avio_tell(s->pb);
2131 avio_seek(s->pb, pos, SEEK_SET);
2132 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2134 // pid = AV_RB16(buf + 1) & 0x1fff;
2135 if(buf[1] & 0x40) break;
2136 pos += ts->raw_packet_size;
2138 avio_seek(s->pb, pos, SEEK_SET);
2143 /**************************************************************/
2144 /* parsing functions - called from other demuxers such as RTP */
2146 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2150 ts = av_mallocz(sizeof(MpegTSContext));
2153 /* no stream case, currently used by RTP */
2154 ts->raw_packet_size = TS_PACKET_SIZE;
2160 /* return the consumed length if a packet was output, or -1 if no
2162 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2163 const uint8_t *buf, int len)
2171 if (ts->stop_parse>0)
2173 if (len < TS_PACKET_SIZE)
2175 if (buf[0] != 0x47) {
2179 handle_packet(ts, buf);
2180 buf += TS_PACKET_SIZE;
2181 len -= TS_PACKET_SIZE;
2187 void ff_mpegts_parse_close(MpegTSContext *ts)
2193 AVInputFormat ff_mpegts_demuxer = {
2195 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2196 .priv_data_size = sizeof(MpegTSContext),
2197 .read_probe = mpegts_probe,
2198 .read_header = mpegts_read_header,
2199 .read_packet = mpegts_read_packet,
2200 .read_close = mpegts_read_close,
2201 .read_seek = read_seek,
2202 .read_timestamp = mpegts_get_pcr,
2203 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2206 AVInputFormat ff_mpegtsraw_demuxer = {
2207 .name = "mpegtsraw",
2208 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2209 .priv_data_size = sizeof(MpegTSContext),
2210 .read_header = mpegts_read_header,
2211 .read_packet = mpegts_raw_read_packet,
2212 .read_close = mpegts_read_close,
2213 .read_seek = read_seek,
2214 .read_timestamp = mpegts_get_pcr,
2215 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2216 .priv_class = &mpegtsraw_class,