2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
31 /* 1.0 second at 24Mbit/s */
32 #define MAX_SCAN_PACKETS 32000
34 /* maximum size in which we look for synchronisation if
35 synchronisation is lost */
36 #define MAX_RESYNC_SIZE 4096
37 #define REGISTRATION_DESCRIPTOR 5
39 typedef struct PESContext PESContext;
41 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
42 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
44 enum MpegTSFilterType {
49 typedef struct MpegTSFilter MpegTSFilter;
51 typedef void PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
53 typedef struct MpegTSPESFilter {
58 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
60 typedef void SetServiceCallback(void *opaque, int ret);
62 typedef struct MpegTSSectionFilter {
66 unsigned int check_crc:1;
67 unsigned int end_of_section_reached:1;
68 SectionCallback *section_cb;
70 } MpegTSSectionFilter;
74 int last_cc; /* last cc code (-1 if first packet) */
75 enum MpegTSFilterType type;
77 MpegTSPESFilter pes_filter;
78 MpegTSSectionFilter section_filter;
82 #define MAX_PIDS_PER_PROGRAM 64
84 unsigned int id; //program id/service id
86 unsigned int pids[MAX_PIDS_PER_PROGRAM];
89 struct MpegTSContext {
91 AVFormatContext *stream;
92 /** raw packet size, including FEC if present */
97 /** if true, all pids are analyzed to find streams */
100 /** compute exact PCR for each transport stream packet */
101 int mpeg2ts_compute_pcr;
103 int64_t cur_pcr; /**< used to estimate the exact PCR */
104 int pcr_incr; /**< used to estimate the exact PCR */
106 /* data needed to handle file based ts */
107 /** stop parsing loop */
109 /** packet containing Audio/Video data */
112 /******************************************/
113 /* private mpegts data */
115 /** structure to keep track of Program->pids mapping */
120 /** filters for various streams specified by PMT + for the PAT and PMT */
121 MpegTSFilter *pids[NB_PID_MAX];
124 /* TS stream handling */
128 MPEGTS_PESHEADER_FILL,
133 /* enough for PES header + length */
134 #define PES_START_SIZE 9
135 #define MAX_PES_HEADER_SIZE (9 + 255)
139 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
142 AVFormatContext *stream;
144 enum MpegTSState state;
145 /* used to get the format */
150 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
151 uint8_t header[MAX_PES_HEADER_SIZE];
154 extern AVInputFormat mpegts_demuxer;
156 static void clear_program(MpegTSContext *ts, unsigned int programid)
160 for(i=0; i<ts->nb_prg; i++)
161 if(ts->prg[i].id == programid)
162 ts->prg[i].nb_pids = 0;
165 static void clear_programs(MpegTSContext *ts)
171 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
174 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
178 p = &ts->prg[ts->nb_prg];
184 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
187 struct Program *p = NULL;
188 for(i=0; i<ts->nb_prg; i++) {
189 if(ts->prg[i].id == programid) {
197 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
199 p->pids[p->nb_pids++] = pid;
203 * \brief discard_pid() decides if the pid is to be discarded according
204 * to caller's programs selection
205 * \param ts : - TS context
207 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
210 static int discard_pid(MpegTSContext *ts, unsigned int pid)
213 int used = 0, discarded = 0;
215 for(i=0; i<ts->nb_prg; i++) {
217 for(j=0; j<p->nb_pids; j++) {
218 if(p->pids[j] != pid)
220 //is program with id p->id set to be discarded?
221 for(k=0; k<ts->stream->nb_programs; k++) {
222 if(ts->stream->programs[k]->id == p->id) {
223 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
232 return !used && discarded;
236 * Assembles PES packets out of TS packets, and then calls the "section_cb"
237 * function when they are complete.
239 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
240 const uint8_t *buf, int buf_size, int is_start)
242 MpegTSSectionFilter *tss = &tss1->u.section_filter;
246 memcpy(tss->section_buf, buf, buf_size);
247 tss->section_index = buf_size;
248 tss->section_h_size = -1;
249 tss->end_of_section_reached = 0;
251 if (tss->end_of_section_reached)
253 len = 4096 - tss->section_index;
256 memcpy(tss->section_buf + tss->section_index, buf, len);
257 tss->section_index += len;
260 /* compute section length if possible */
261 if (tss->section_h_size == -1 && tss->section_index >= 3) {
262 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
265 tss->section_h_size = len;
268 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
269 tss->end_of_section_reached = 1;
270 if (!tss->check_crc ||
271 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
272 tss->section_buf, tss->section_h_size) == 0)
273 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
277 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
278 SectionCallback *section_cb, void *opaque,
282 MpegTSFilter *filter;
283 MpegTSSectionFilter *sec;
286 av_log(ts->stream, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid);
288 if (pid >= NB_PID_MAX || ts->pids[pid])
290 filter = av_mallocz(sizeof(MpegTSFilter));
293 ts->pids[pid] = filter;
294 filter->type = MPEGTS_SECTION;
296 filter->last_cc = -1;
297 sec = &filter->u.section_filter;
298 sec->section_cb = section_cb;
299 sec->opaque = opaque;
300 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
301 sec->check_crc = check_crc;
302 if (!sec->section_buf) {
309 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
313 MpegTSFilter *filter;
314 MpegTSPESFilter *pes;
316 if (pid >= NB_PID_MAX || ts->pids[pid])
318 filter = av_mallocz(sizeof(MpegTSFilter));
321 ts->pids[pid] = filter;
322 filter->type = MPEGTS_PES;
324 filter->last_cc = -1;
325 pes = &filter->u.pes_filter;
326 pes->pes_cb = pes_cb;
327 pes->opaque = opaque;
331 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
336 if (filter->type == MPEGTS_SECTION)
337 av_freep(&filter->u.section_filter.section_buf);
338 else if (filter->type == MPEGTS_PES) {
339 /* referenced private data will be freed later in
340 * av_close_input_stream */
341 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
342 av_freep(&filter->u.pes_filter.opaque);
347 ts->pids[pid] = NULL;
350 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
351 int stat[packet_size];
356 memset(stat, 0, packet_size*sizeof(int));
358 for(x=i=0; i<size-3; i++){
359 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
361 if(stat[x] > best_score){
368 if(x == packet_size) x= 0;
374 /* autodetect fec presence. Must have at least 1024 bytes */
375 static int get_packet_size(const uint8_t *buf, int size)
377 int score, fec_score, dvhs_score;
379 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
382 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
383 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
384 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
385 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
387 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
388 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
389 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
393 typedef struct SectionHeader {
398 uint8_t last_sec_num;
401 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
414 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
420 if ((p + 1) >= p_end)
428 /* read and allocate a DVB string preceeded by its length */
429 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
436 len = get8(&p, p_end);
439 if ((p + len) > p_end)
441 str = av_malloc(len + 1);
451 static int parse_section_header(SectionHeader *h,
452 const uint8_t **pp, const uint8_t *p_end)
456 val = get8(pp, p_end);
461 val = get16(pp, p_end);
465 val = get8(pp, p_end);
468 h->version = (val >> 1) & 0x1f;
469 val = get8(pp, p_end);
473 val = get8(pp, p_end);
476 h->last_sec_num = val;
481 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
483 MpegTSContext *ts = filter->u.section_filter.opaque;
484 SectionHeader h1, *h = &h1;
487 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
488 int program_info_length, pcr_pid, pid, stream_type;
489 int desc_list_len, desc_len, desc_tag;
490 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
491 char language[4] = {0}; /* initialize to kill warnings */
492 int has_hdmv_descr = 0;
493 int has_dirac_descr = 0;
496 av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
497 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
499 p_end = section + section_len - 4;
501 if (parse_section_header(h, &p, p_end) < 0)
504 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
505 h->id, h->sec_num, h->last_sec_num);
507 if (h->tid != PMT_TID)
510 clear_program(ts, h->id);
511 pcr_pid = get16(&p, p_end) & 0x1fff;
514 add_pid_to_pmt(ts, h->id, pcr_pid);
516 av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
518 program_info_length = get16(&p, p_end) & 0xfff;
519 if (program_info_length < 0)
521 while(program_info_length >= 2) {
523 tag = get8(&p, p_end);
524 len = get8(&p, p_end);
525 if(len > program_info_length - 2)
526 //something else is broken, exit the program_descriptors_loop
528 program_info_length -= len + 2;
529 if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
531 bytes[0] = get8(&p, p_end);
532 bytes[1] = get8(&p, p_end);
533 bytes[2] = get8(&p, p_end);
534 bytes[3] = get8(&p, p_end);
536 if(bytes[0] == 'H' && bytes[1] == 'D' &&
537 bytes[2] == 'M' && bytes[3] == 'V')
542 p += program_info_length;
548 stream_type = get8(&p, p_end);
551 pid = get16(&p, p_end) & 0x1fff;
554 desc_list_len = get16(&p, p_end) & 0xfff;
555 if (desc_list_len < 0)
557 desc_list_end = p + desc_list_len;
558 if (desc_list_end > p_end)
561 desc_tag = get8(&p, desc_list_end);
564 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
565 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
566 /*assume DVB AC-3 Audio*/
567 stream_type = STREAM_TYPE_AUDIO_AC3;
568 } else if(desc_tag == 0x7B) {
570 stream_type = STREAM_TYPE_AUDIO_DTS;
573 desc_len = get8(&p, desc_list_end);
576 desc_end = p + desc_len;
577 if (desc_end > desc_list_end)
580 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
584 case DVB_SUBT_DESCID:
585 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
586 stream_type = STREAM_TYPE_SUBTITLE_DVB;
588 language[0] = get8(&p, desc_end);
589 language[1] = get8(&p, desc_end);
590 language[2] = get8(&p, desc_end);
593 comp_page = get16(&p, desc_end);
594 anc_page = get16(&p, desc_end);
597 case 0x0a: /* ISO 639 language descriptor */
598 language[0] = get8(&p, desc_end);
599 language[1] = get8(&p, desc_end);
600 language[2] = get8(&p, desc_end);
603 case REGISTRATION_DESCRIPTOR: /*MPEG-2 Registration descriptor */
606 bytes[0] = get8(&p, desc_end);
607 bytes[1] = get8(&p, desc_end);
608 bytes[2] = get8(&p, desc_end);
609 bytes[3] = get8(&p, desc_end);
610 if(bytes[0] == 'd' && bytes[1] == 'r' &&
611 bytes[2] == 'a' && bytes[3] == 'c')
623 av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
627 /* now create ffmpeg stream */
628 switch(stream_type) {
629 case STREAM_TYPE_AUDIO_MPEG1:
630 case STREAM_TYPE_AUDIO_MPEG2:
631 case STREAM_TYPE_VIDEO_MPEG1:
632 case STREAM_TYPE_VIDEO_MPEG2:
633 case STREAM_TYPE_VIDEO_MPEG4:
634 case STREAM_TYPE_VIDEO_H264:
635 case STREAM_TYPE_VIDEO_VC1:
636 case STREAM_TYPE_VIDEO_DIRAC:
637 case STREAM_TYPE_AUDIO_AAC:
638 case STREAM_TYPE_AUDIO_AC3:
639 case STREAM_TYPE_AUDIO_DTS:
640 case STREAM_TYPE_AUDIO_HDMV_DTS:
641 case STREAM_TYPE_SUBTITLE_DVB:
642 if((stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
643 || (stream_type == STREAM_TYPE_VIDEO_DIRAC && !has_dirac_descr))
645 if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
646 pes= ts->pids[pid]->u.pes_filter.opaque;
649 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
650 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
652 st = new_pes_av_stream(pes, 0);
654 add_pid_to_pmt(ts, h->id, pid);
656 av_program_add_stream_index(ts->stream, h->id, st->index);
659 /* we ignore the other streams */
664 if (language[0] != 0) {
665 av_metadata_set(&st->metadata, "language", language);
668 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
669 st->codec->sub_id = (anc_page << 16) | comp_page;
673 /* all parameters are there */
675 mpegts_close_filter(ts, filter);
678 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
680 MpegTSContext *ts = filter->u.section_filter.opaque;
681 SectionHeader h1, *h = &h1;
682 const uint8_t *p, *p_end;
686 av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
687 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
689 p_end = section + section_len - 4;
691 if (parse_section_header(h, &p, p_end) < 0)
693 if (h->tid != PAT_TID)
698 sid = get16(&p, p_end);
701 pmt_pid = get16(&p, p_end) & 0x1fff;
705 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
710 av_new_program(ts->stream, sid);
712 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
713 add_pat_entry(ts, sid);
714 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
715 add_pid_to_pmt(ts, sid, pmt_pid);
721 mpegts_close_filter(ts, filter);
724 static void mpegts_set_service(MpegTSContext *ts)
726 mpegts_open_section_filter(ts, PAT_PID,
730 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
732 MpegTSContext *ts = filter->u.section_filter.opaque;
733 SectionHeader h1, *h = &h1;
734 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
735 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
736 char *name, *provider_name;
739 av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
740 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
743 p_end = section + section_len - 4;
745 if (parse_section_header(h, &p, p_end) < 0)
747 if (h->tid != SDT_TID)
749 onid = get16(&p, p_end);
752 val = get8(&p, p_end);
756 sid = get16(&p, p_end);
759 val = get8(&p, p_end);
762 desc_list_len = get16(&p, p_end) & 0xfff;
763 if (desc_list_len < 0)
765 desc_list_end = p + desc_list_len;
766 if (desc_list_end > p_end)
769 desc_tag = get8(&p, desc_list_end);
772 desc_len = get8(&p, desc_list_end);
773 desc_end = p + desc_len;
774 if (desc_end > desc_list_end)
777 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
782 service_type = get8(&p, p_end);
783 if (service_type < 0)
785 provider_name = getstr8(&p, p_end);
788 name = getstr8(&p, p_end);
790 AVProgram *program = av_new_program(ts->stream, sid);
792 av_metadata_set(&program->metadata, "name", name);
793 av_metadata_set(&program->metadata, "provider_name", provider_name);
797 av_free(provider_name);
808 /* scan services in a transport stream by looking at the SDT */
809 static void mpegts_scan_sdt(MpegTSContext *ts)
811 mpegts_open_section_filter(ts, SDT_PID,
815 static int64_t get_pts(const uint8_t *p)
817 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
818 pts |= (AV_RB16(p + 1) >> 1) << 15;
819 pts |= AV_RB16(p + 3) >> 1;
823 /* return non zero if a packet could be constructed */
824 static void mpegts_push_data(MpegTSFilter *filter,
825 const uint8_t *buf, int buf_size, int is_start,
828 PESContext *pes = filter->u.pes_filter.opaque;
829 MpegTSContext *ts = pes->ts;
837 pes->state = MPEGTS_HEADER;
839 pes->ts_packet_pos = pos;
842 while (buf_size > 0) {
845 len = PES_START_SIZE - pes->data_index;
848 memcpy(pes->header + pes->data_index, p, len);
849 pes->data_index += len;
852 if (pes->data_index == PES_START_SIZE) {
853 /* we got all the PES or section header. We can now
856 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
858 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
859 pes->header[2] == 0x01) {
860 /* it must be an mpeg2 PES stream */
861 code = pes->header[3] | 0x100;
863 !((code >= 0x1c0 && code <= 0x1df) ||
864 (code >= 0x1e0 && code <= 0x1ef) ||
865 (code == 0x1bd) || (code == 0x1fd)))
867 pes->state = MPEGTS_PESHEADER_FILL;
868 pes->total_size = AV_RB16(pes->header + 4);
869 /* NOTE: a zero total size means the PES size is
872 pes->total_size += 6;
873 pes->pes_header_size = pes->header[8] + 9;
875 /* otherwise, it should be a table */
878 pes->state = MPEGTS_SKIP;
883 /**********************************************/
884 /* PES packing parsing */
885 case MPEGTS_PESHEADER_FILL:
886 len = pes->pes_header_size - pes->data_index;
889 memcpy(pes->header + pes->data_index, p, len);
890 pes->data_index += len;
893 if (pes->data_index == pes->pes_header_size) {
897 flags = pes->header[7];
899 pes->pts = AV_NOPTS_VALUE;
900 pes->dts = AV_NOPTS_VALUE;
901 if ((flags & 0xc0) == 0x80) {
902 pes->dts = pes->pts = get_pts(r);
904 } else if ((flags & 0xc0) == 0xc0) {
905 pes->pts = get_pts(r);
907 pes->dts = get_pts(r);
910 /* we got the full header. We parse it and get the payload */
911 pes->state = MPEGTS_PAYLOAD;
915 if (pes->total_size) {
916 len = pes->total_size - pes->data_index;
923 AVPacket *pkt = ts->pkt;
924 if (pes->st && av_new_packet(pkt, len) == 0) {
925 memcpy(pkt->data, p, len);
926 pkt->stream_index = pes->st->index;
929 /* store position of first TS packet of this PES packet */
930 pkt->pos = pes->ts_packet_pos;
931 /* reset pts values */
932 pes->pts = AV_NOPTS_VALUE;
933 pes->dts = AV_NOPTS_VALUE;
947 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
950 enum CodecID codec_id;
951 enum CodecType codec_type;
953 switch(pes->stream_type){
954 case STREAM_TYPE_AUDIO_MPEG1:
955 case STREAM_TYPE_AUDIO_MPEG2:
956 codec_type = CODEC_TYPE_AUDIO;
957 codec_id = CODEC_ID_MP3;
959 case STREAM_TYPE_VIDEO_MPEG1:
960 case STREAM_TYPE_VIDEO_MPEG2:
961 codec_type = CODEC_TYPE_VIDEO;
962 codec_id = CODEC_ID_MPEG2VIDEO;
964 case STREAM_TYPE_VIDEO_MPEG4:
965 codec_type = CODEC_TYPE_VIDEO;
966 codec_id = CODEC_ID_MPEG4;
968 case STREAM_TYPE_VIDEO_H264:
969 codec_type = CODEC_TYPE_VIDEO;
970 codec_id = CODEC_ID_H264;
972 case STREAM_TYPE_VIDEO_VC1:
973 codec_type = CODEC_TYPE_VIDEO;
974 codec_id = CODEC_ID_VC1;
976 case STREAM_TYPE_VIDEO_DIRAC:
977 codec_type = CODEC_TYPE_VIDEO;
978 codec_id = CODEC_ID_DIRAC;
980 case STREAM_TYPE_AUDIO_AAC:
981 codec_type = CODEC_TYPE_AUDIO;
982 codec_id = CODEC_ID_AAC;
984 case STREAM_TYPE_AUDIO_AC3:
985 codec_type = CODEC_TYPE_AUDIO;
986 codec_id = CODEC_ID_AC3;
988 case STREAM_TYPE_AUDIO_DTS:
989 case STREAM_TYPE_AUDIO_HDMV_DTS:
990 codec_type = CODEC_TYPE_AUDIO;
991 codec_id = CODEC_ID_DTS;
993 case STREAM_TYPE_SUBTITLE_DVB:
994 codec_type = CODEC_TYPE_SUBTITLE;
995 codec_id = CODEC_ID_DVB_SUBTITLE;
998 if (code >= 0x1c0 && code <= 0x1df) {
999 codec_type = CODEC_TYPE_AUDIO;
1000 codec_id = CODEC_ID_MP2;
1001 } else if (code == 0x1bd) {
1002 codec_type = CODEC_TYPE_AUDIO;
1003 codec_id = CODEC_ID_AC3;
1005 codec_type = CODEC_TYPE_VIDEO;
1006 codec_id = CODEC_ID_PROBE;
1010 st = av_new_stream(pes->stream, pes->pid);
1012 av_set_pts_info(st, 33, 1, 90000);
1013 st->priv_data = pes;
1014 st->codec->codec_type = codec_type;
1015 st->codec->codec_id = codec_id;
1016 st->need_parsing = AVSTREAM_PARSE_FULL;
1023 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1028 /* if no pid found, then add a pid context */
1029 pes = av_mallocz(sizeof(PESContext));
1033 pes->stream = ts->stream;
1035 pes->pcr_pid = pcr_pid;
1036 pes->stream_type = stream_type;
1037 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1045 /* handle one TS packet */
1046 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
1048 AVFormatContext *s = ts->stream;
1050 int len, pid, cc, cc_ok, afc, is_start;
1051 const uint8_t *p, *p_end;
1054 pid = AV_RB16(packet + 1) & 0x1fff;
1055 if(pid && discard_pid(ts, pid))
1057 is_start = packet[1] & 0x40;
1058 tss = ts->pids[pid];
1059 if (ts->auto_guess && tss == NULL && is_start) {
1060 add_pes_stream(ts, pid, -1, 0);
1061 tss = ts->pids[pid];
1066 /* continuity check (currently not used) */
1067 cc = (packet[3] & 0xf);
1068 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1071 /* skip adaptation field */
1072 afc = (packet[3] >> 4) & 3;
1074 if (afc == 0) /* reserved value */
1076 if (afc == 2) /* adaptation field only */
1079 /* skip adapation field */
1082 /* if past the end of packet, ignore */
1083 p_end = packet + TS_PACKET_SIZE;
1087 pos = url_ftell(ts->stream->pb);
1088 ts->pos47= pos % ts->raw_packet_size;
1090 if (tss->type == MPEGTS_SECTION) {
1092 /* pointer field present */
1094 if (p + len > p_end)
1097 /* write remaining section bytes */
1098 write_section_data(s, tss,
1100 /* check whether filter has been closed */
1106 write_section_data(s, tss,
1111 write_section_data(s, tss,
1116 // Note: The position here points actually behind the current packet.
1117 tss->u.pes_filter.pes_cb(tss,
1118 p, p_end - p, is_start, pos - ts->raw_packet_size);
1122 /* XXX: try to find a better synchro over several packets (use
1123 get_packet_size() ?) */
1124 static int mpegts_resync(ByteIOContext *pb)
1128 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1133 url_fseek(pb, -1, SEEK_CUR);
1141 /* return -1 if error or EOF. Return 0 if OK. */
1142 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1147 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1148 if (len != TS_PACKET_SIZE)
1149 return AVERROR(EIO);
1150 /* check paquet sync byte */
1151 if (buf[0] != 0x47) {
1152 /* find a new packet start */
1153 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1154 if (mpegts_resync(pb) < 0)
1155 return AVERROR_INVALIDDATA;
1159 skip = raw_packet_size - TS_PACKET_SIZE;
1161 url_fskip(pb, skip);
1168 static int handle_packets(MpegTSContext *ts, int nb_packets)
1170 AVFormatContext *s = ts->stream;
1171 ByteIOContext *pb = s->pb;
1172 uint8_t packet[TS_PACKET_SIZE];
1173 int packet_num, ret;
1178 if (ts->stop_parse>0)
1181 if (nb_packets != 0 && packet_num >= nb_packets)
1183 ret = read_packet(pb, packet, ts->raw_packet_size);
1186 handle_packet(ts, packet);
1191 static int mpegts_probe(AVProbeData *p)
1194 const int size= p->buf_size;
1195 int score, fec_score, dvhs_score;
1196 int check_count= size / TS_FEC_PACKET_SIZE;
1197 #define CHECK_COUNT 10
1199 if (check_count < CHECK_COUNT)
1202 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1203 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1204 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1205 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1207 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1208 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1209 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1210 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1213 /* only use the extension for safer guess */
1214 if (match_ext(p->filename, "ts"))
1215 return AVPROBE_SCORE_MAX;
1221 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1222 (-1) if not available */
1223 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1224 const uint8_t *packet)
1226 int afc, len, flags;
1230 afc = (packet[3] >> 4) & 3;
1240 if (!(flags & 0x10))
1245 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1246 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1250 static int mpegts_read_header(AVFormatContext *s,
1251 AVFormatParameters *ap)
1253 MpegTSContext *ts = s->priv_data;
1254 ByteIOContext *pb = s->pb;
1255 uint8_t buf[5*1024];
1260 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1261 if(ap->mpeg2ts_raw){
1262 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1267 /* read the first 1024 bytes to get packet size */
1268 pos = url_ftell(pb);
1269 len = get_buffer(pb, buf, sizeof(buf));
1270 if (len != sizeof(buf))
1272 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1273 if (ts->raw_packet_size <= 0)
1278 if (s->iformat == &mpegts_demuxer) {
1281 /* first do a scaning to get all the services */
1282 url_fseek(pb, pos, SEEK_SET);
1283 mpegts_scan_sdt(ts);
1285 mpegts_set_service(ts);
1287 handle_packets(ts, s->probesize);
1288 /* if could not find service, enable auto_guess */
1293 av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
1295 s->ctx_flags |= AVFMTCTX_NOHEADER;
1298 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1299 int64_t pcrs[2], pcr_h;
1300 int packet_count[2];
1301 uint8_t packet[TS_PACKET_SIZE];
1303 /* only read packets */
1305 st = av_new_stream(s, 0);
1308 av_set_pts_info(st, 60, 1, 27000000);
1309 st->codec->codec_type = CODEC_TYPE_DATA;
1310 st->codec->codec_id = CODEC_ID_MPEG2TS;
1312 /* we iterate until we find two PCRs to estimate the bitrate */
1317 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1320 pid = AV_RB16(packet + 1) & 0x1fff;
1321 if ((pcr_pid == -1 || pcr_pid == pid) &&
1322 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1324 packet_count[nb_pcrs] = nb_packets;
1325 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1333 /* NOTE1: the bitrate is computed without the FEC */
1334 /* NOTE2: it is only the bitrate of the start of the stream */
1335 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1336 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1337 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1338 st->codec->bit_rate = s->bit_rate;
1339 st->start_time = ts->cur_pcr;
1341 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1342 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1346 url_fseek(pb, pos, SEEK_SET);
1352 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1354 static int mpegts_raw_read_packet(AVFormatContext *s,
1357 MpegTSContext *ts = s->priv_data;
1359 int64_t pcr_h, next_pcr_h, pos;
1360 int pcr_l, next_pcr_l;
1361 uint8_t pcr_buf[12];
1363 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1364 return AVERROR(ENOMEM);
1365 pkt->pos= url_ftell(s->pb);
1366 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1368 av_free_packet(pkt);
1371 if (ts->mpeg2ts_compute_pcr) {
1372 /* compute exact PCR for each packet */
1373 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1374 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1375 pos = url_ftell(s->pb);
1376 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1377 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1378 get_buffer(s->pb, pcr_buf, 12);
1379 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1380 /* XXX: not precise enough */
1381 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1386 url_fseek(s->pb, pos, SEEK_SET);
1387 /* no next PCR found: we use previous increment */
1388 ts->cur_pcr = pcr_h * 300 + pcr_l;
1390 pkt->pts = ts->cur_pcr;
1391 pkt->duration = ts->pcr_incr;
1392 ts->cur_pcr += ts->pcr_incr;
1394 pkt->stream_index = 0;
1398 static int mpegts_read_packet(AVFormatContext *s,
1401 MpegTSContext *ts = s->priv_data;
1404 return handle_packets(ts, 0);
1407 static int mpegts_read_close(AVFormatContext *s)
1409 MpegTSContext *ts = s->priv_data;
1414 for(i=0;i<NB_PID_MAX;i++)
1415 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1420 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1421 int64_t *ppos, int64_t pos_limit)
1423 MpegTSContext *ts = s->priv_data;
1424 int64_t pos, timestamp;
1425 uint8_t buf[TS_PACKET_SIZE];
1426 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1427 const int find_next= 1;
1428 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1431 url_fseek(s->pb, pos, SEEK_SET);
1432 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1433 return AV_NOPTS_VALUE;
1434 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1435 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1438 pos += ts->raw_packet_size;
1442 pos -= ts->raw_packet_size;
1444 return AV_NOPTS_VALUE;
1445 url_fseek(s->pb, pos, SEEK_SET);
1446 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1447 return AV_NOPTS_VALUE;
1448 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1449 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1459 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1460 MpegTSContext *ts = s->priv_data;
1461 uint8_t buf[TS_PACKET_SIZE];
1464 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1467 pos= url_ftell(s->pb);
1470 url_fseek(s->pb, pos, SEEK_SET);
1471 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1473 // pid = AV_RB16(buf + 1) & 0x1fff;
1474 if(buf[1] & 0x40) break;
1475 pos += ts->raw_packet_size;
1477 url_fseek(s->pb, pos, SEEK_SET);
1482 /**************************************************************/
1483 /* parsing functions - called from other demuxers such as RTP */
1485 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1489 ts = av_mallocz(sizeof(MpegTSContext));
1492 /* no stream case, currently used by RTP */
1493 ts->raw_packet_size = TS_PACKET_SIZE;
1499 /* return the consumed length if a packet was output, or -1 if no
1501 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1502 const uint8_t *buf, int len)
1510 if (ts->stop_parse>0)
1512 if (len < TS_PACKET_SIZE)
1514 if (buf[0] != 0x47) {
1518 handle_packet(ts, buf);
1519 buf += TS_PACKET_SIZE;
1520 len -= TS_PACKET_SIZE;
1526 void mpegts_parse_close(MpegTSContext *ts)
1530 for(i=0;i<NB_PID_MAX;i++)
1531 av_free(ts->pids[i]);
1535 AVInputFormat mpegts_demuxer = {
1537 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1538 sizeof(MpegTSContext),
1545 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1548 AVInputFormat mpegtsraw_demuxer = {
1550 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1551 sizeof(MpegTSContext),
1554 mpegts_raw_read_packet,
1558 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,