2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/log.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
27 #include "libavutil/opt.h"
28 #include "libavcodec/bytestream.h"
29 #include "libavcodec/get_bits.h"
33 #include "avio_internal.h"
38 /* maximum size in which we look for synchronisation if
39 synchronisation is lost */
40 #define MAX_RESYNC_SIZE 65536
42 #define MAX_PES_PAYLOAD 200*1024
44 #define MAX_MP4_DESCR_COUNT 16
46 enum MpegTSFilterType {
51 typedef struct MpegTSFilter MpegTSFilter;
53 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
55 typedef struct MpegTSPESFilter {
60 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
62 typedef void SetServiceCallback(void *opaque, int ret);
64 typedef struct MpegTSSectionFilter {
68 unsigned int check_crc:1;
69 unsigned int end_of_section_reached:1;
70 SectionCallback *section_cb;
72 } MpegTSSectionFilter;
77 int last_cc; /* last cc code (-1 if first packet) */
78 enum MpegTSFilterType type;
80 MpegTSPESFilter pes_filter;
81 MpegTSSectionFilter section_filter;
85 #define MAX_PIDS_PER_PROGRAM 64
87 unsigned int id; //program id/service id
89 unsigned int pids[MAX_PIDS_PER_PROGRAM];
92 struct MpegTSContext {
95 AVFormatContext *stream;
96 /** raw packet size, including FEC if present */
101 /** if true, all pids are analyzed to find streams */
104 /** compute exact PCR for each transport stream packet */
105 int mpeg2ts_compute_pcr;
107 int64_t cur_pcr; /**< used to estimate the exact PCR */
108 int pcr_incr; /**< used to estimate the exact PCR */
110 /* data needed to handle file based ts */
111 /** stop parsing loop */
113 /** packet containing Audio/Video data */
115 /** to detect seek */
118 /******************************************/
119 /* private mpegts data */
121 /** structure to keep track of Program->pids mapping */
126 /** filters for various streams specified by PMT + for the PAT and PMT */
127 MpegTSFilter *pids[NB_PID_MAX];
130 static const AVOption options[] = {
131 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
132 {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
136 static const AVClass mpegtsraw_class = {
137 .class_name = "mpegtsraw demuxer",
138 .item_name = av_default_item_name,
140 .version = LIBAVUTIL_VERSION_INT,
143 /* TS stream handling */
148 MPEGTS_PESHEADER_FILL,
153 /* enough for PES header + length */
154 #define PES_START_SIZE 6
155 #define PES_HEADER_SIZE 9
156 #define MAX_PES_HEADER_SIZE (9 + 255)
158 typedef struct PESContext {
160 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
163 AVFormatContext *stream;
165 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
166 enum MpegTSState state;
167 /* used to get the format */
169 int flags; /**< copied to the AVPacket flags */
172 int extended_stream_id;
174 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
175 uint8_t header[MAX_PES_HEADER_SIZE];
180 extern AVInputFormat ff_mpegts_demuxer;
182 static void clear_program(MpegTSContext *ts, unsigned int programid)
186 for(i=0; i<ts->nb_prg; i++)
187 if(ts->prg[i].id == programid)
188 ts->prg[i].nb_pids = 0;
191 static void clear_programs(MpegTSContext *ts)
197 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
200 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
204 p = &ts->prg[ts->nb_prg];
210 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
213 struct Program *p = NULL;
214 for(i=0; i<ts->nb_prg; i++) {
215 if(ts->prg[i].id == programid) {
223 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
225 p->pids[p->nb_pids++] = pid;
229 * @brief discard_pid() decides if the pid is to be discarded according
230 * to caller's programs selection
231 * @param ts : - TS context
233 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
236 static int discard_pid(MpegTSContext *ts, unsigned int pid)
239 int used = 0, discarded = 0;
241 for(i=0; i<ts->nb_prg; i++) {
243 for(j=0; j<p->nb_pids; j++) {
244 if(p->pids[j] != pid)
246 //is program with id p->id set to be discarded?
247 for(k=0; k<ts->stream->nb_programs; k++) {
248 if(ts->stream->programs[k]->id == p->id) {
249 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
258 return !used && discarded;
262 * Assemble PES packets out of TS packets, and then call the "section_cb"
263 * function when they are complete.
265 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
266 const uint8_t *buf, int buf_size, int is_start)
268 MpegTSSectionFilter *tss = &tss1->u.section_filter;
272 memcpy(tss->section_buf, buf, buf_size);
273 tss->section_index = buf_size;
274 tss->section_h_size = -1;
275 tss->end_of_section_reached = 0;
277 if (tss->end_of_section_reached)
279 len = 4096 - tss->section_index;
282 memcpy(tss->section_buf + tss->section_index, buf, len);
283 tss->section_index += len;
286 /* compute section length if possible */
287 if (tss->section_h_size == -1 && tss->section_index >= 3) {
288 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
291 tss->section_h_size = len;
294 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
295 tss->end_of_section_reached = 1;
296 if (!tss->check_crc ||
297 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
298 tss->section_buf, tss->section_h_size) == 0)
299 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
303 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
304 SectionCallback *section_cb, void *opaque,
308 MpegTSFilter *filter;
309 MpegTSSectionFilter *sec;
311 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
313 if (pid >= NB_PID_MAX || ts->pids[pid])
315 filter = av_mallocz(sizeof(MpegTSFilter));
318 ts->pids[pid] = filter;
319 filter->type = MPEGTS_SECTION;
322 filter->last_cc = -1;
323 sec = &filter->u.section_filter;
324 sec->section_cb = section_cb;
325 sec->opaque = opaque;
326 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
327 sec->check_crc = check_crc;
328 if (!sec->section_buf) {
335 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
339 MpegTSFilter *filter;
340 MpegTSPESFilter *pes;
342 if (pid >= NB_PID_MAX || ts->pids[pid])
344 filter = av_mallocz(sizeof(MpegTSFilter));
347 ts->pids[pid] = filter;
348 filter->type = MPEGTS_PES;
351 filter->last_cc = -1;
352 pes = &filter->u.pes_filter;
353 pes->pes_cb = pes_cb;
354 pes->opaque = opaque;
358 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
363 if (filter->type == MPEGTS_SECTION)
364 av_freep(&filter->u.section_filter.section_buf);
365 else if (filter->type == MPEGTS_PES) {
366 PESContext *pes = filter->u.pes_filter.opaque;
367 av_freep(&pes->buffer);
368 /* referenced private data will be freed later in
369 * avformat_close_input */
370 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
371 av_freep(&filter->u.pes_filter.opaque);
376 ts->pids[pid] = NULL;
379 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
380 int stat[TS_MAX_PACKET_SIZE];
385 memset(stat, 0, packet_size*sizeof(int));
387 for(x=i=0; i<size-3; i++){
388 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
390 if(stat[x] > best_score){
397 if(x == packet_size) x= 0;
403 /* autodetect fec presence. Must have at least 1024 bytes */
404 static int get_packet_size(const uint8_t *buf, int size)
406 int score, fec_score, dvhs_score;
408 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
411 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
412 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
413 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
414 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
416 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
417 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
418 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
422 typedef struct SectionHeader {
427 uint8_t last_sec_num;
430 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
443 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
449 if ((p + 1) >= p_end)
457 /* read and allocate a DVB string preceded by its length */
458 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
465 len = get8(&p, p_end);
468 if ((p + len) > p_end)
470 str = av_malloc(len + 1);
480 static int parse_section_header(SectionHeader *h,
481 const uint8_t **pp, const uint8_t *p_end)
485 val = get8(pp, p_end);
490 val = get16(pp, p_end);
494 val = get8(pp, p_end);
497 h->version = (val >> 1) & 0x1f;
498 val = get8(pp, p_end);
502 val = get8(pp, p_end);
505 h->last_sec_num = val;
510 uint32_t stream_type;
511 enum AVMediaType codec_type;
512 enum CodecID codec_id;
515 static const StreamType ISO_types[] = {
516 { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
517 { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
518 { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
519 { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
520 { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
521 { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
522 { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
523 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
524 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
525 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
529 static const StreamType HDMV_types[] = {
530 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
531 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
532 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
533 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
534 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
535 { 0x85, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS HD */
536 { 0x86, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS HD MASTER*/
537 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
542 static const StreamType MISC_types[] = {
543 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
544 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
548 static const StreamType REGD_types[] = {
549 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
550 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
551 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
552 { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
553 { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
554 { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
555 { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
559 /* descriptor present */
560 static const StreamType DESC_types[] = {
561 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
562 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
563 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
564 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
565 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
569 static void mpegts_find_stream_type(AVStream *st,
570 uint32_t stream_type, const StreamType *types)
572 for (; types->stream_type; types++) {
573 if (stream_type == types->stream_type) {
574 st->codec->codec_type = types->codec_type;
575 st->codec->codec_id = types->codec_id;
581 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
582 uint32_t stream_type, uint32_t prog_reg_desc)
584 avpriv_set_pts_info(st, 33, 1, 90000);
586 st->codec->codec_type = AVMEDIA_TYPE_DATA;
587 st->codec->codec_id = CODEC_ID_NONE;
588 st->need_parsing = AVSTREAM_PARSE_FULL;
590 pes->stream_type = stream_type;
592 av_log(pes->stream, AV_LOG_DEBUG,
593 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
594 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
596 st->codec->codec_tag = pes->stream_type;
598 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
599 if (prog_reg_desc == AV_RL32("HDMV") &&
600 st->codec->codec_id == CODEC_ID_NONE) {
601 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
602 if (pes->stream_type == 0x83) {
603 // HDMV TrueHD streams also contain an AC3 coded version of the
604 // audio track - add a second stream for this
606 // priv_data cannot be shared between streams
607 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
609 return AVERROR(ENOMEM);
610 memcpy(sub_pes, pes, sizeof(*sub_pes));
612 sub_st = avformat_new_stream(pes->stream, NULL);
615 return AVERROR(ENOMEM);
618 sub_st->id = pes->pid;
619 avpriv_set_pts_info(sub_st, 33, 1, 90000);
620 sub_st->priv_data = sub_pes;
621 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
622 sub_st->codec->codec_id = CODEC_ID_AC3;
623 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
624 sub_pes->sub_st = pes->sub_st = sub_st;
627 if (st->codec->codec_id == CODEC_ID_NONE)
628 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
633 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
637 pkt->destruct = av_destruct_packet;
638 pkt->data = pes->buffer;
639 pkt->size = pes->data_index;
641 if(pes->total_size != MAX_PES_PAYLOAD &&
642 pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
643 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
644 pes->flags |= AV_PKT_FLAG_CORRUPT;
646 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
648 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
649 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
650 pkt->stream_index = pes->sub_st->index;
652 pkt->stream_index = pes->st->index;
655 /* store position of first TS packet of this PES packet */
656 pkt->pos = pes->ts_packet_pos;
657 pkt->flags = pes->flags;
659 /* reset pts values */
660 pes->pts = AV_NOPTS_VALUE;
661 pes->dts = AV_NOPTS_VALUE;
667 static uint64_t get_bits64(GetBitContext *gb, int bits)
672 ret |= get_bits(gb, 17);
676 ret |= get_bits(gb, bits);
680 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
683 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
684 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
685 int dts_flag = -1, cts_flag = -1;
686 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
687 init_get_bits(&gb, buf, buf_size*8);
689 if (sl->use_au_start)
690 au_start_flag = get_bits1(&gb);
692 au_end_flag = get_bits1(&gb);
693 if (!sl->use_au_start && !sl->use_au_end)
694 au_start_flag = au_end_flag = 1;
696 ocr_flag = get_bits1(&gb);
698 idle_flag = get_bits1(&gb);
700 padding_flag = get_bits1(&gb);
702 padding_bits = get_bits(&gb, 3);
704 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
705 if (sl->packet_seq_num_len)
706 skip_bits_long(&gb, sl->packet_seq_num_len);
707 if (sl->degr_prior_len)
709 skip_bits(&gb, sl->degr_prior_len);
711 skip_bits_long(&gb, sl->ocr_len);
713 if (sl->use_rand_acc_pt)
715 if (sl->au_seq_num_len > 0)
716 skip_bits_long(&gb, sl->au_seq_num_len);
717 if (sl->use_timestamps) {
718 dts_flag = get_bits1(&gb);
719 cts_flag = get_bits1(&gb);
722 if (sl->inst_bitrate_len)
723 inst_bitrate_flag = get_bits1(&gb);
725 dts = get_bits64(&gb, sl->timestamp_len);
727 cts = get_bits64(&gb, sl->timestamp_len);
729 skip_bits_long(&gb, sl->au_len);
730 if (inst_bitrate_flag)
731 skip_bits_long(&gb, sl->inst_bitrate_len);
734 if (dts != AV_NOPTS_VALUE)
736 if (cts != AV_NOPTS_VALUE)
739 if (sl->timestamp_len && sl->timestamp_res)
740 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
742 return (get_bits_count(&gb) + 7) >> 3;
745 /* return non zero if a packet could be constructed */
746 static int mpegts_push_data(MpegTSFilter *filter,
747 const uint8_t *buf, int buf_size, int is_start,
750 PESContext *pes = filter->u.pes_filter.opaque;
751 MpegTSContext *ts = pes->ts;
759 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
760 new_pes_packet(pes, ts->pkt);
763 pes->state = MPEGTS_HEADER;
765 pes->ts_packet_pos = pos;
768 while (buf_size > 0) {
771 len = PES_START_SIZE - pes->data_index;
774 memcpy(pes->header + pes->data_index, p, len);
775 pes->data_index += len;
778 if (pes->data_index == PES_START_SIZE) {
779 /* we got all the PES or section header. We can now
781 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
782 pes->header[2] == 0x01) {
783 /* it must be an mpeg2 PES stream */
784 code = pes->header[3] | 0x100;
785 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
787 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
788 code == 0x1be) /* padding_stream */
791 /* stream not present in PMT */
793 pes->st = avformat_new_stream(ts->stream, NULL);
795 return AVERROR(ENOMEM);
796 pes->st->id = pes->pid;
797 mpegts_set_stream_info(pes->st, pes, 0, 0);
800 pes->total_size = AV_RB16(pes->header + 4);
801 /* NOTE: a zero total size means the PES size is
803 if (!pes->total_size)
804 pes->total_size = MAX_PES_PAYLOAD;
806 /* allocate pes buffer */
807 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
809 return AVERROR(ENOMEM);
811 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
812 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
813 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
814 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
815 pes->state = MPEGTS_PESHEADER;
816 if (pes->st->codec->codec_id == CODEC_ID_NONE) {
817 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
818 pes->pid, pes->stream_type);
819 pes->st->codec->codec_id = CODEC_ID_PROBE;
822 pes->state = MPEGTS_PAYLOAD;
826 /* otherwise, it should be a table */
829 pes->state = MPEGTS_SKIP;
834 /**********************************************/
835 /* PES packing parsing */
836 case MPEGTS_PESHEADER:
837 len = PES_HEADER_SIZE - pes->data_index;
842 memcpy(pes->header + pes->data_index, p, len);
843 pes->data_index += len;
846 if (pes->data_index == PES_HEADER_SIZE) {
847 pes->pes_header_size = pes->header[8] + 9;
848 pes->state = MPEGTS_PESHEADER_FILL;
851 case MPEGTS_PESHEADER_FILL:
852 len = pes->pes_header_size - pes->data_index;
857 memcpy(pes->header + pes->data_index, p, len);
858 pes->data_index += len;
861 if (pes->data_index == pes->pes_header_size) {
863 unsigned int flags, pes_ext, skip;
865 flags = pes->header[7];
867 pes->pts = AV_NOPTS_VALUE;
868 pes->dts = AV_NOPTS_VALUE;
869 if ((flags & 0xc0) == 0x80) {
870 pes->dts = pes->pts = ff_parse_pes_pts(r);
872 } else if ((flags & 0xc0) == 0xc0) {
873 pes->pts = ff_parse_pes_pts(r);
875 pes->dts = ff_parse_pes_pts(r);
878 pes->extended_stream_id = -1;
879 if (flags & 0x01) { /* PES extension */
881 /* Skip PES private data, program packet sequence counter and P-STD buffer */
882 skip = (pes_ext >> 4) & 0xb;
885 if ((pes_ext & 0x41) == 0x01 &&
886 (r + 2) <= (pes->header + pes->pes_header_size)) {
887 /* PES extension 2 */
888 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
889 pes->extended_stream_id = r[1];
893 /* we got the full header. We parse it and get the payload */
894 pes->state = MPEGTS_PAYLOAD;
896 if (pes->stream_type == 0x12 && buf_size > 0) {
897 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
898 pes->pes_header_size += sl_header_bytes;
899 p += sl_header_bytes;
900 buf_size -= sl_header_bytes;
905 if (buf_size > 0 && pes->buffer) {
906 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
907 new_pes_packet(pes, ts->pkt);
908 pes->total_size = MAX_PES_PAYLOAD;
909 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
911 return AVERROR(ENOMEM);
913 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
914 // pes packet size is < ts size packet and pes data is padded with 0xff
915 // not sure if this is legal in ts but see issue #2392
916 buf_size = pes->total_size;
918 memcpy(pes->buffer+pes->data_index, p, buf_size);
919 pes->data_index += buf_size;
922 /* emit complete packets with known packet size
923 * decreases demuxer delay for infrequent packets like subtitles from
924 * a couple of seconds to milliseconds for properly muxed files.
925 * total_size is the number of bytes following pes_packet_length
926 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
927 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
928 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
930 new_pes_packet(pes, ts->pkt);
942 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
947 /* if no pid found, then add a pid context */
948 pes = av_mallocz(sizeof(PESContext));
952 pes->stream = ts->stream;
954 pes->pcr_pid = pcr_pid;
955 pes->state = MPEGTS_SKIP;
956 pes->pts = AV_NOPTS_VALUE;
957 pes->dts = AV_NOPTS_VALUE;
958 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
971 Mp4Descr *active_descr;
975 } MP4DescrParseContext;
977 static int init_MP4DescrParseContext(
978 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
979 unsigned size, Mp4Descr *descr, int max_descr_count)
983 return AVERROR_INVALIDDATA;
985 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
986 NULL, NULL, NULL, NULL)) < 0)
993 d->active_descr = NULL;
994 d->max_descr_count = max_descr_count;
999 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
1000 int64_t new_off = avio_tell(pb);
1001 (*len) -= new_off - *off;
1005 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1008 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1011 if (parse_mp4_descr(d, off, len, 0) < 0)
1013 update_offsets(&d->pb, &off, &len);
1018 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1020 avio_rb16(&d->pb); // ID
1026 update_offsets(&d->pb, &off, &len);
1027 return parse_mp4_descr_arr(d, off, len);
1030 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1035 id_flags = avio_rb16(&d->pb);
1036 if (!(id_flags & 0x0020)) { //URL_Flag
1037 update_offsets(&d->pb, &off, &len);
1038 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1044 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1047 if (d->descr_count >= d->max_descr_count)
1049 ff_mp4_parse_es_descr(&d->pb, &es_id);
1050 d->active_descr = d->descr + (d->descr_count++);
1052 d->active_descr->es_id = es_id;
1053 update_offsets(&d->pb, &off, &len);
1054 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1055 update_offsets(&d->pb, &off, &len);
1057 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1058 d->active_descr = NULL;
1062 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1064 Mp4Descr *descr = d->active_descr;
1067 d->active_descr->dec_config_descr = av_malloc(len);
1068 if (!descr->dec_config_descr)
1069 return AVERROR(ENOMEM);
1070 descr->dec_config_descr_len = len;
1071 avio_read(&d->pb, descr->dec_config_descr, len);
1075 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1077 Mp4Descr *descr = d->active_descr;
1082 predefined = avio_r8(&d->pb);
1085 int flags = avio_r8(&d->pb);
1086 descr->sl.use_au_start = !!(flags & 0x80);
1087 descr->sl.use_au_end = !!(flags & 0x40);
1088 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1089 descr->sl.use_padding = !!(flags & 0x08);
1090 descr->sl.use_timestamps = !!(flags & 0x04);
1091 descr->sl.use_idle = !!(flags & 0x02);
1092 descr->sl.timestamp_res = avio_rb32(&d->pb);
1094 descr->sl.timestamp_len = avio_r8(&d->pb);
1095 descr->sl.ocr_len = avio_r8(&d->pb);
1096 descr->sl.au_len = avio_r8(&d->pb);
1097 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1098 lengths = avio_rb16(&d->pb);
1099 descr->sl.degr_prior_len = lengths >> 12;
1100 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1101 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1103 av_log_missing_feature(d->s, "Predefined SLConfigDescriptor\n", 0);
1108 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1111 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1112 update_offsets(&d->pb, &off, &len);
1113 if (len < 0 || len1 > len || len1 <= 0) {
1114 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1118 if (d->level++ >= MAX_LEVEL) {
1119 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1123 if (target_tag && tag != target_tag) {
1124 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1130 parse_MP4IODescrTag(d, off, len1);
1133 parse_MP4ODescrTag(d, off, len1);
1136 parse_MP4ESDescrTag(d, off, len1);
1138 case MP4DecConfigDescrTag:
1139 parse_MP4DecConfigDescrTag(d, off, len1);
1142 parse_MP4SLDescrTag(d, off, len1);
1148 avio_seek(&d->pb, off + len1, SEEK_SET);
1152 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1153 Mp4Descr *descr, int *descr_count, int max_descr_count)
1155 MP4DescrParseContext d;
1156 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1159 parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1161 *descr_count = d.descr_count;
1165 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1166 Mp4Descr *descr, int *descr_count, int max_descr_count)
1168 MP4DescrParseContext d;
1169 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1172 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1174 *descr_count = d.descr_count;
1178 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1180 MpegTSContext *ts = filter->u.section_filter.opaque;
1182 const uint8_t *p, *p_end;
1184 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1185 int mp4_descr_count = 0;
1187 AVFormatContext *s = ts->stream;
1189 p_end = section + section_len - 4;
1191 if (parse_section_header(&h, &p, p_end) < 0)
1193 if (h.tid != M4OD_TID)
1196 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1198 for (pid = 0; pid < NB_PID_MAX; pid++) {
1201 for (i = 0; i < mp4_descr_count; i++) {
1204 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1206 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1207 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1210 pes = ts->pids[pid]->u.pes_filter.opaque;
1216 pes->sl = mp4_descr[i].sl;
1218 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1219 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1220 ff_mp4_read_dec_config_descr(s, st, &pb);
1221 if (st->codec->codec_id == CODEC_ID_AAC &&
1222 st->codec->extradata_size > 0)
1223 st->need_parsing = 0;
1224 if (st->codec->codec_id == CODEC_ID_H264 &&
1225 st->codec->extradata_size > 0)
1226 st->need_parsing = 0;
1228 if (st->codec->codec_id <= CODEC_ID_NONE) {
1229 } else if (st->codec->codec_id < CODEC_ID_FIRST_AUDIO) {
1230 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1231 } else if (st->codec->codec_id < CODEC_ID_FIRST_SUBTITLE) {
1232 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1233 } else if (st->codec->codec_id < CODEC_ID_FIRST_UNKNOWN) {
1234 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1238 for (i = 0; i < mp4_descr_count; i++)
1239 av_free(mp4_descr[i].dec_config_descr);
1242 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1243 const uint8_t **pp, const uint8_t *desc_list_end,
1244 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1247 const uint8_t *desc_end;
1248 int desc_len, desc_tag, desc_es_id;
1252 desc_tag = get8(pp, desc_list_end);
1255 desc_len = get8(pp, desc_list_end);
1258 desc_end = *pp + desc_len;
1259 if (desc_end > desc_list_end)
1262 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1264 if (st->codec->codec_id == CODEC_ID_NONE &&
1265 stream_type == STREAM_TYPE_PRIVATE_DATA)
1266 mpegts_find_stream_type(st, desc_tag, DESC_types);
1269 case 0x1E: /* SL descriptor */
1270 desc_es_id = get16(pp, desc_end);
1271 if (ts && ts->pids[pid])
1272 ts->pids[pid]->es_id = desc_es_id;
1273 for (i = 0; i < mp4_descr_count; i++)
1274 if (mp4_descr[i].dec_config_descr_len &&
1275 mp4_descr[i].es_id == desc_es_id) {
1277 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1278 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1279 ff_mp4_read_dec_config_descr(fc, st, &pb);
1280 if (st->codec->codec_id == CODEC_ID_AAC &&
1281 st->codec->extradata_size > 0)
1282 st->need_parsing = 0;
1283 if (st->codec->codec_id == CODEC_ID_MPEG4SYSTEMS)
1284 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1287 case 0x1F: /* FMC descriptor */
1288 get16(pp, desc_end);
1289 if (mp4_descr_count > 0 && st->codec->codec_id == CODEC_ID_AAC_LATM &&
1290 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1292 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1293 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1294 ff_mp4_read_dec_config_descr(fc, st, &pb);
1295 if (st->codec->codec_id == CODEC_ID_AAC &&
1296 st->codec->extradata_size > 0)
1297 st->need_parsing = 0;
1300 case 0x56: /* DVB teletext descriptor */
1301 language[0] = get8(pp, desc_end);
1302 language[1] = get8(pp, desc_end);
1303 language[2] = get8(pp, desc_end);
1305 av_dict_set(&st->metadata, "language", language, 0);
1307 case 0x59: /* subtitling descriptor */
1308 language[0] = get8(pp, desc_end);
1309 language[1] = get8(pp, desc_end);
1310 language[2] = get8(pp, desc_end);
1312 /* hearing impaired subtitles detection */
1313 switch(get8(pp, desc_end)) {
1314 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1315 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1316 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1317 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1318 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1319 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1320 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1323 if (st->codec->extradata) {
1324 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1325 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1327 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1328 if (st->codec->extradata) {
1329 st->codec->extradata_size = 4;
1330 memcpy(st->codec->extradata, *pp, 4);
1334 av_dict_set(&st->metadata, "language", language, 0);
1336 case 0x0a: /* ISO 639 language descriptor */
1337 for (i = 0; i + 4 <= desc_len; i += 4) {
1338 language[i + 0] = get8(pp, desc_end);
1339 language[i + 1] = get8(pp, desc_end);
1340 language[i + 2] = get8(pp, desc_end);
1341 language[i + 3] = ',';
1342 switch (get8(pp, desc_end)) {
1343 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1344 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1345 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1349 language[i - 1] = 0;
1350 av_dict_set(&st->metadata, "language", language, 0);
1353 case 0x05: /* registration descriptor */
1354 st->codec->codec_tag = bytestream_get_le32(pp);
1355 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1356 if (st->codec->codec_id == CODEC_ID_NONE)
1357 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1366 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1368 MpegTSContext *ts = filter->u.section_filter.opaque;
1369 SectionHeader h1, *h = &h1;
1372 const uint8_t *p, *p_end, *desc_list_end;
1373 int program_info_length, pcr_pid, pid, stream_type;
1375 uint32_t prog_reg_desc = 0; /* registration descriptor */
1377 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1378 int mp4_descr_count = 0;
1381 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1382 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1384 p_end = section + section_len - 4;
1386 if (parse_section_header(h, &p, p_end) < 0)
1389 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1390 h->id, h->sec_num, h->last_sec_num);
1392 if (h->tid != PMT_TID)
1395 clear_program(ts, h->id);
1396 pcr_pid = get16(&p, p_end);
1400 add_pid_to_pmt(ts, h->id, pcr_pid);
1402 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1404 program_info_length = get16(&p, p_end);
1405 if (program_info_length < 0)
1407 program_info_length &= 0xfff;
1408 while(program_info_length >= 2) {
1410 tag = get8(&p, p_end);
1411 len = get8(&p, p_end);
1413 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1415 if(len > program_info_length - 2)
1416 //something else is broken, exit the program_descriptors_loop
1418 program_info_length -= len + 2;
1419 if (tag == 0x1d) { // IOD descriptor
1420 get8(&p, p_end); // scope
1421 get8(&p, p_end); // label
1423 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1424 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1425 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1426 prog_reg_desc = bytestream_get_le32(&p);
1431 p += program_info_length;
1435 // stop parsing after pmt, we found header
1436 if (!ts->stream->nb_streams)
1442 stream_type = get8(&p, p_end);
1443 if (stream_type < 0)
1445 pid = get16(&p, p_end);
1450 /* now create stream */
1451 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1452 pes = ts->pids[pid]->u.pes_filter.opaque;
1454 pes->st = avformat_new_stream(pes->stream, NULL);
1455 pes->st->id = pes->pid;
1458 } else if (stream_type != 0x13) {
1459 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1460 pes = add_pes_stream(ts, pid, pcr_pid);
1462 st = avformat_new_stream(pes->stream, NULL);
1466 int idx = ff_find_stream_index(ts->stream, pid);
1468 st = ts->stream->streams[idx];
1470 st = avformat_new_stream(ts->stream, NULL);
1472 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1479 if (pes && !pes->stream_type)
1480 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1482 add_pid_to_pmt(ts, h->id, pid);
1484 ff_program_add_stream_index(ts->stream, h->id, st->index);
1486 desc_list_len = get16(&p, p_end);
1487 if (desc_list_len < 0)
1489 desc_list_len &= 0xfff;
1490 desc_list_end = p + desc_list_len;
1491 if (desc_list_end > p_end)
1494 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1495 mp4_descr, mp4_descr_count, pid, ts) < 0)
1498 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1499 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1500 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1507 for (i = 0; i < mp4_descr_count; i++)
1508 av_free(mp4_descr[i].dec_config_descr);
1511 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1513 MpegTSContext *ts = filter->u.section_filter.opaque;
1514 SectionHeader h1, *h = &h1;
1515 const uint8_t *p, *p_end;
1518 av_dlog(ts->stream, "PAT:\n");
1519 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1521 p_end = section + section_len - 4;
1523 if (parse_section_header(h, &p, p_end) < 0)
1525 if (h->tid != PAT_TID)
1530 sid = get16(&p, p_end);
1533 pmt_pid = get16(&p, p_end);
1538 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1540 if (sid == 0x0000) {
1543 av_new_program(ts->stream, sid);
1544 if (ts->pids[pmt_pid])
1545 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1546 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1547 add_pat_entry(ts, sid);
1548 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1549 add_pid_to_pmt(ts, sid, pmt_pid);
1554 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1556 MpegTSContext *ts = filter->u.section_filter.opaque;
1557 SectionHeader h1, *h = &h1;
1558 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1559 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1560 char *name, *provider_name;
1562 av_dlog(ts->stream, "SDT:\n");
1563 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1565 p_end = section + section_len - 4;
1567 if (parse_section_header(h, &p, p_end) < 0)
1569 if (h->tid != SDT_TID)
1571 onid = get16(&p, p_end);
1574 val = get8(&p, p_end);
1578 sid = get16(&p, p_end);
1581 val = get8(&p, p_end);
1584 desc_list_len = get16(&p, p_end);
1585 if (desc_list_len < 0)
1587 desc_list_len &= 0xfff;
1588 desc_list_end = p + desc_list_len;
1589 if (desc_list_end > p_end)
1592 desc_tag = get8(&p, desc_list_end);
1595 desc_len = get8(&p, desc_list_end);
1596 desc_end = p + desc_len;
1597 if (desc_end > desc_list_end)
1600 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1601 desc_tag, desc_len);
1605 service_type = get8(&p, p_end);
1606 if (service_type < 0)
1608 provider_name = getstr8(&p, p_end);
1611 name = getstr8(&p, p_end);
1613 AVProgram *program = av_new_program(ts->stream, sid);
1615 av_dict_set(&program->metadata, "service_name", name, 0);
1616 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1620 av_free(provider_name);
1631 /* handle one TS packet */
1632 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1634 AVFormatContext *s = ts->stream;
1636 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1637 has_adaptation, has_payload;
1638 const uint8_t *p, *p_end;
1641 pid = AV_RB16(packet + 1) & 0x1fff;
1642 if(pid && discard_pid(ts, pid))
1644 is_start = packet[1] & 0x40;
1645 tss = ts->pids[pid];
1646 if (ts->auto_guess && tss == NULL && is_start) {
1647 add_pes_stream(ts, pid, -1);
1648 tss = ts->pids[pid];
1653 afc = (packet[3] >> 4) & 3;
1654 if (afc == 0) /* reserved value */
1656 has_adaptation = afc & 2;
1657 has_payload = afc & 1;
1658 is_discontinuity = has_adaptation
1659 && packet[4] != 0 /* with length > 0 */
1660 && (packet[5] & 0x80); /* and discontinuity indicated */
1662 /* continuity check (currently not used) */
1663 cc = (packet[3] & 0xf);
1664 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1665 cc_ok = pid == 0x1FFF // null packet PID
1668 || expected_cc == cc;
1672 av_log(ts->stream, AV_LOG_WARNING,
1673 "Continuity check failed for pid %d expected %d got %d\n",
1674 pid, expected_cc, cc);
1675 if(tss->type == MPEGTS_PES) {
1676 PESContext *pc = tss->u.pes_filter.opaque;
1677 pc->flags |= AV_PKT_FLAG_CORRUPT;
1684 if (has_adaptation) {
1685 /* skip adaptation field */
1688 /* if past the end of packet, ignore */
1689 p_end = packet + TS_PACKET_SIZE;
1693 pos = avio_tell(ts->stream->pb);
1694 ts->pos47= pos % ts->raw_packet_size;
1696 if (tss->type == MPEGTS_SECTION) {
1698 /* pointer field present */
1700 if (p + len > p_end)
1703 /* write remaining section bytes */
1704 write_section_data(s, tss,
1706 /* check whether filter has been closed */
1712 write_section_data(s, tss,
1717 write_section_data(s, tss,
1723 // Note: The position here points actually behind the current packet.
1724 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1725 pos - ts->raw_packet_size)) < 0)
1732 /* XXX: try to find a better synchro over several packets (use
1733 get_packet_size() ?) */
1734 static int mpegts_resync(AVFormatContext *s)
1736 AVIOContext *pb = s->pb;
1739 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1741 if (pb->eof_reached)
1744 avio_seek(pb, -1, SEEK_CUR);
1748 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1753 /* return -1 if error or EOF. Return 0 if OK. */
1754 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1756 AVIOContext *pb = s->pb;
1760 len = avio_read(pb, buf, TS_PACKET_SIZE);
1761 if (len != TS_PACKET_SIZE)
1762 return len < 0 ? len : AVERROR_EOF;
1763 /* check packet sync byte */
1764 if (buf[0] != 0x47) {
1765 /* find a new packet start */
1766 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1767 if (mpegts_resync(s) < 0)
1768 return AVERROR(EAGAIN);
1772 skip = raw_packet_size - TS_PACKET_SIZE;
1774 avio_skip(pb, skip);
1781 static int handle_packets(MpegTSContext *ts, int nb_packets)
1783 AVFormatContext *s = ts->stream;
1784 uint8_t packet[TS_PACKET_SIZE+FF_INPUT_BUFFER_PADDING_SIZE];
1785 int packet_num, ret = 0;
1787 if (avio_tell(s->pb) != ts->last_pos) {
1789 av_dlog(ts->stream, "Skipping after seek\n");
1790 /* seek detected, flush pes buffer */
1791 for (i = 0; i < NB_PID_MAX; i++) {
1793 if (ts->pids[i]->type == MPEGTS_PES) {
1794 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1795 av_freep(&pes->buffer);
1796 pes->data_index = 0;
1797 pes->state = MPEGTS_SKIP; /* skip until pes header */
1799 ts->pids[i]->last_cc = -1;
1806 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1808 if (ts->stop_parse>0)
1811 if (nb_packets != 0 && packet_num >= nb_packets)
1813 ret = read_packet(s, packet, ts->raw_packet_size);
1816 ret = handle_packet(ts, packet);
1820 ts->last_pos = avio_tell(s->pb);
1824 static int mpegts_probe(AVProbeData *p)
1826 const int size= p->buf_size;
1827 int score, fec_score, dvhs_score;
1828 int check_count= size / TS_FEC_PACKET_SIZE;
1829 #define CHECK_COUNT 10
1831 if (check_count < CHECK_COUNT)
1834 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1835 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1836 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1837 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1839 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1840 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1841 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1842 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1846 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1847 (-1) if not available */
1848 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1849 const uint8_t *packet)
1851 int afc, len, flags;
1855 afc = (packet[3] >> 4) & 3;
1865 if (!(flags & 0x10))
1870 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1871 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1875 static int mpegts_read_header(AVFormatContext *s)
1877 MpegTSContext *ts = s->priv_data;
1878 AVIOContext *pb = s->pb;
1879 uint8_t buf[5*1024];
1883 /* read the first 1024 bytes to get packet size */
1884 pos = avio_tell(pb);
1885 len = avio_read(pb, buf, sizeof(buf));
1886 if (len != sizeof(buf))
1888 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1889 if (ts->raw_packet_size <= 0)
1894 if (s->iformat == &ff_mpegts_demuxer) {
1897 /* first do a scan to get all the services */
1898 if (avio_seek(pb, pos, SEEK_SET) < 0 && pb->seekable)
1899 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1901 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1903 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1905 handle_packets(ts, s->probesize / ts->raw_packet_size);
1906 /* if could not find service, enable auto_guess */
1910 av_dlog(ts->stream, "tuning done\n");
1912 s->ctx_flags |= AVFMTCTX_NOHEADER;
1915 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1916 int64_t pcrs[2], pcr_h;
1917 int packet_count[2];
1918 uint8_t packet[TS_PACKET_SIZE];
1920 /* only read packets */
1922 st = avformat_new_stream(s, NULL);
1925 avpriv_set_pts_info(st, 60, 1, 27000000);
1926 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1927 st->codec->codec_id = CODEC_ID_MPEG2TS;
1929 /* we iterate until we find two PCRs to estimate the bitrate */
1934 ret = read_packet(s, packet, ts->raw_packet_size);
1937 pid = AV_RB16(packet + 1) & 0x1fff;
1938 if ((pcr_pid == -1 || pcr_pid == pid) &&
1939 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1941 packet_count[nb_pcrs] = nb_packets;
1942 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1950 /* NOTE1: the bitrate is computed without the FEC */
1951 /* NOTE2: it is only the bitrate of the start of the stream */
1952 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1953 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1954 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1955 st->codec->bit_rate = s->bit_rate;
1956 st->start_time = ts->cur_pcr;
1957 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1958 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1961 avio_seek(pb, pos, SEEK_SET);
1967 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1969 static int mpegts_raw_read_packet(AVFormatContext *s,
1972 MpegTSContext *ts = s->priv_data;
1974 int64_t pcr_h, next_pcr_h, pos;
1975 int pcr_l, next_pcr_l;
1976 uint8_t pcr_buf[12];
1978 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1979 return AVERROR(ENOMEM);
1980 pkt->pos= avio_tell(s->pb);
1981 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1983 av_free_packet(pkt);
1986 if (ts->mpeg2ts_compute_pcr) {
1987 /* compute exact PCR for each packet */
1988 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1989 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1990 pos = avio_tell(s->pb);
1991 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1992 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1993 avio_read(s->pb, pcr_buf, 12);
1994 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1995 /* XXX: not precise enough */
1996 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2001 avio_seek(s->pb, pos, SEEK_SET);
2002 /* no next PCR found: we use previous increment */
2003 ts->cur_pcr = pcr_h * 300 + pcr_l;
2005 pkt->pts = ts->cur_pcr;
2006 pkt->duration = ts->pcr_incr;
2007 ts->cur_pcr += ts->pcr_incr;
2009 pkt->stream_index = 0;
2013 static int mpegts_read_packet(AVFormatContext *s,
2016 MpegTSContext *ts = s->priv_data;
2021 ret = handle_packets(ts, 0);
2023 /* flush pes data left */
2024 for (i = 0; i < NB_PID_MAX; i++) {
2025 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2026 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2027 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2028 new_pes_packet(pes, pkt);
2029 pes->state = MPEGTS_SKIP;
2037 if (!ret && pkt->size < 0)
2038 ret = AVERROR(EINTR);
2042 static int mpegts_read_close(AVFormatContext *s)
2044 MpegTSContext *ts = s->priv_data;
2049 for(i=0;i<NB_PID_MAX;i++)
2050 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2055 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2056 int64_t *ppos, int64_t pos_limit)
2058 MpegTSContext *ts = s->priv_data;
2059 int64_t pos, timestamp;
2060 uint8_t buf[TS_PACKET_SIZE];
2061 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2062 const int find_next= 1;
2063 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2066 avio_seek(s->pb, pos, SEEK_SET);
2067 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2068 return AV_NOPTS_VALUE;
2069 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2070 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2073 pos += ts->raw_packet_size;
2077 pos -= ts->raw_packet_size;
2079 return AV_NOPTS_VALUE;
2080 avio_seek(s->pb, pos, SEEK_SET);
2081 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2082 return AV_NOPTS_VALUE;
2083 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2084 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2094 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
2095 MpegTSContext *ts = s->priv_data;
2096 uint8_t buf[TS_PACKET_SIZE];
2099 if (ff_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
2102 pos= avio_tell(s->pb);
2105 avio_seek(s->pb, pos, SEEK_SET);
2106 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2108 // pid = AV_RB16(buf + 1) & 0x1fff;
2109 if(buf[1] & 0x40) break;
2110 pos += ts->raw_packet_size;
2112 avio_seek(s->pb, pos, SEEK_SET);
2117 /**************************************************************/
2118 /* parsing functions - called from other demuxers such as RTP */
2120 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2124 ts = av_mallocz(sizeof(MpegTSContext));
2127 /* no stream case, currently used by RTP */
2128 ts->raw_packet_size = TS_PACKET_SIZE;
2134 /* return the consumed length if a packet was output, or -1 if no
2136 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2137 const uint8_t *buf, int len)
2145 if (ts->stop_parse>0)
2147 if (len < TS_PACKET_SIZE)
2149 if (buf[0] != 0x47) {
2153 handle_packet(ts, buf);
2154 buf += TS_PACKET_SIZE;
2155 len -= TS_PACKET_SIZE;
2161 void ff_mpegts_parse_close(MpegTSContext *ts)
2165 for(i=0;i<NB_PID_MAX;i++)
2166 av_free(ts->pids[i]);
2170 AVInputFormat ff_mpegts_demuxer = {
2172 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
2173 .priv_data_size = sizeof(MpegTSContext),
2174 .read_probe = mpegts_probe,
2175 .read_header = mpegts_read_header,
2176 .read_packet = mpegts_read_packet,
2177 .read_close = mpegts_read_close,
2178 .read_seek = read_seek,
2179 .read_timestamp = mpegts_get_pcr,
2180 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2183 AVInputFormat ff_mpegtsraw_demuxer = {
2184 .name = "mpegtsraw",
2185 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
2186 .priv_data_size = sizeof(MpegTSContext),
2187 .read_header = mpegts_read_header,
2188 .read_packet = mpegts_raw_read_packet,
2189 .read_close = mpegts_read_close,
2190 .read_seek = read_seek,
2191 .read_timestamp = mpegts_get_pcr,
2192 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2193 .priv_class = &mpegtsraw_class,