2 * MPEG2 transport stream (aka DVB) demux
3 * Copyright (c) 2002-2003 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 /* 1.0 second at 24Mbit/s */
27 #define MAX_SCAN_PACKETS 32000
29 /* maximum size in which we look for synchronisation if
30 synchronisation is lost */
31 #define MAX_RESYNC_SIZE 4096
33 typedef struct PESContext PESContext;
35 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int stream_type);
36 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
38 enum MpegTSFilterType {
43 typedef void PESCallback(void *opaque, const uint8_t *buf, int len, int is_start);
45 typedef struct MpegTSPESFilter {
50 typedef void SectionCallback(void *opaque, const uint8_t *buf, int len);
52 typedef void SetServiceCallback(void *opaque, int ret);
54 typedef struct MpegTSSectionFilter {
59 int end_of_section_reached:1;
60 SectionCallback *section_cb;
62 } MpegTSSectionFilter;
64 typedef struct MpegTSFilter {
66 int last_cc; /* last cc code (-1 if first packet) */
67 enum MpegTSFilterType type;
69 MpegTSPESFilter pes_filter;
70 MpegTSSectionFilter section_filter;
74 typedef struct MpegTSService {
81 struct MpegTSContext {
83 AVFormatContext *stream;
84 int raw_packet_size; /* raw packet size, including FEC if present */
85 int auto_guess; /* if true, all pids are analized to find streams */
88 int mpeg2ts_raw; /* force raw MPEG2 transport stream output, if possible */
89 int mpeg2ts_compute_pcr; /* compute exact PCR for each transport stream packet */
91 /* used to estimate the exact PCR */
96 /* data needed to handle file based ts */
97 int stop_parse; /* stop parsing loop */
98 AVPacket *pkt; /* packet containing av data */
100 /******************************************/
101 /* private mpegts data */
103 MpegTSFilter *sdt_filter;
105 MpegTSService **services;
107 /* set service context (XXX: allocated it ?) */
108 SetServiceCallback *set_service_cb;
109 void *set_service_opaque;
110 MpegTSFilter *pat_filter;
111 MpegTSFilter *pmt_filter;
114 MpegTSFilter *pids[NB_PID_MAX];
117 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
118 const uint8_t *buf, int buf_size, int is_start)
120 MpegTSSectionFilter *tss = &tss1->u.section_filter;
124 memcpy(tss->section_buf, buf, buf_size);
125 tss->section_index = buf_size;
126 tss->section_h_size = -1;
127 tss->end_of_section_reached = 0;
129 if (tss->end_of_section_reached)
131 len = 4096 - tss->section_index;
134 memcpy(tss->section_buf + tss->section_index, buf, len);
135 tss->section_index += len;
138 /* compute section length if possible */
139 if (tss->section_h_size == -1 && tss->section_index >= 3) {
140 len = (((tss->section_buf[1] & 0xf) << 8) | tss->section_buf[2]) + 3;
143 tss->section_h_size = len;
146 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
147 tss->end_of_section_reached = 1;
148 if (!tss->check_crc ||
149 mpegts_crc32(tss->section_buf, tss->section_h_size) == 0)
150 tss->section_cb(tss->opaque, tss->section_buf, tss->section_h_size);
154 MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
155 SectionCallback *section_cb, void *opaque,
159 MpegTSFilter *filter;
160 MpegTSSectionFilter *sec;
163 printf("Filter: pid=0x%x\n", pid);
165 if (pid >= NB_PID_MAX || ts->pids[pid])
167 filter = av_mallocz(sizeof(MpegTSFilter));
170 ts->pids[pid] = filter;
171 filter->type = MPEGTS_SECTION;
173 filter->last_cc = -1;
174 sec = &filter->u.section_filter;
175 sec->section_cb = section_cb;
176 sec->opaque = opaque;
177 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
178 sec->check_crc = check_crc;
179 if (!sec->section_buf) {
186 MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
190 MpegTSFilter *filter;
191 MpegTSPESFilter *pes;
193 if (pid >= NB_PID_MAX || ts->pids[pid])
195 filter = av_mallocz(sizeof(MpegTSFilter));
198 ts->pids[pid] = filter;
199 filter->type = MPEGTS_PES;
201 filter->last_cc = -1;
202 pes = &filter->u.pes_filter;
203 pes->pes_cb = pes_cb;
204 pes->opaque = opaque;
208 void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
213 if (filter->type == MPEGTS_SECTION)
214 av_freep(&filter->u.section_filter.section_buf);
215 else if (filter->type == MPEGTS_PES)
216 av_freep(&filter->u.pes_filter.opaque);
219 ts->pids[pid] = NULL;
222 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
223 int stat[packet_size];
228 memset(stat, 0, packet_size*sizeof(int));
230 for(x=i=0; i<size; i++){
233 if(stat[x] > best_score){
240 if(x == packet_size) x= 0;
246 /* autodetect fec presence. Must have at least 1024 bytes */
247 static int get_packet_size(const uint8_t *buf, int size)
249 int score, fec_score, dvhs_score;
251 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
254 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
255 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
256 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
257 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
259 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
260 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
261 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
265 typedef struct SectionHeader {
270 uint8_t last_sec_num;
273 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
286 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
292 if ((p + 1) >= p_end)
294 c = (p[0] << 8) | p[1];
300 /* read and allocate a DVB string preceeded by its length */
301 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
308 len = get8(&p, p_end);
311 if ((p + len) > p_end)
313 str = av_malloc(len + 1);
323 static int parse_section_header(SectionHeader *h,
324 const uint8_t **pp, const uint8_t *p_end)
328 val = get8(pp, p_end);
333 val = get16(pp, p_end);
337 val = get8(pp, p_end);
340 h->version = (val >> 1) & 0x1f;
341 val = get8(pp, p_end);
345 val = get8(pp, p_end);
348 h->last_sec_num = val;
352 static MpegTSService *new_service(MpegTSContext *ts, int sid,
353 char *provider_name, char *name)
355 MpegTSService *service;
358 printf("new_service: sid=0x%04x provider='%s' name='%s'\n",
359 sid, provider_name, name);
362 service = av_mallocz(sizeof(MpegTSService));
366 service->provider_name = provider_name;
367 service->name = name;
368 dynarray_add(&ts->services, &ts->nb_services, service);
372 static void pmt_cb(void *opaque, const uint8_t *section, int section_len)
374 MpegTSContext *ts = opaque;
375 SectionHeader h1, *h = &h1;
378 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
379 int program_info_length, pcr_pid, pid, stream_type;
380 int desc_list_len, desc_len, desc_tag;
381 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
386 av_hex_dump(stdout, (uint8_t *)section, section_len);
388 p_end = section + section_len - 4;
390 if (parse_section_header(h, &p, p_end) < 0)
393 printf("sid=0x%x sec_num=%d/%d\n", h->id, h->sec_num, h->last_sec_num);
395 if (h->tid != PMT_TID || (ts->req_sid >= 0 && h->id != ts->req_sid) )
398 pcr_pid = get16(&p, p_end) & 0x1fff;
401 ts->pcr_pid = pcr_pid;
403 printf("pcr_pid=0x%x\n", pcr_pid);
405 program_info_length = get16(&p, p_end) & 0xfff;
406 if (program_info_length < 0)
408 p += program_info_length;
414 stream_type = get8(&p, p_end);
417 pid = get16(&p, p_end) & 0x1fff;
420 desc_list_len = get16(&p, p_end) & 0xfff;
421 if (desc_list_len < 0)
423 desc_list_end = p + desc_list_len;
424 if (desc_list_end > p_end)
427 desc_tag = get8(&p, desc_list_end);
430 desc_len = get8(&p, desc_list_end);
431 desc_end = p + desc_len;
432 if (desc_end > desc_list_end)
435 printf("tag: 0x%02x len=%d\n", desc_tag, desc_len);
438 case DVB_SUBT_DESCID:
439 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
440 stream_type = STREAM_TYPE_SUBTITLE_DVB;
442 language[0] = get8(&p, desc_end);
443 language[1] = get8(&p, desc_end);
444 language[2] = get8(&p, desc_end);
447 comp_page = get16(&p, desc_end);
448 anc_page = get16(&p, desc_end);
451 case 0x0a: /* ISO 639 language descriptor */
452 language[0] = get8(&p, desc_end);
453 language[1] = get8(&p, desc_end);
454 language[2] = get8(&p, desc_end);
465 printf("stream_type=%d pid=0x%x\n", stream_type, pid);
468 /* now create ffmpeg stream */
469 switch(stream_type) {
470 case STREAM_TYPE_AUDIO_MPEG1:
471 case STREAM_TYPE_AUDIO_MPEG2:
472 case STREAM_TYPE_VIDEO_MPEG1:
473 case STREAM_TYPE_VIDEO_MPEG2:
474 case STREAM_TYPE_VIDEO_MPEG4:
475 case STREAM_TYPE_VIDEO_H264:
476 case STREAM_TYPE_AUDIO_AAC:
477 case STREAM_TYPE_AUDIO_AC3:
478 case STREAM_TYPE_AUDIO_DTS:
479 case STREAM_TYPE_SUBTITLE_DVB:
480 pes = add_pes_stream(ts, pid, stream_type);
482 st = new_pes_av_stream(pes, 0);
485 /* we ignore the other streams */
490 if (language[0] != 0) {
491 st->language[0] = language[0];
492 st->language[1] = language[1];
493 st->language[2] = language[2];
494 st->language[3] = language[3];
497 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
498 st->codec->sub_id = (anc_page << 16) | comp_page;
502 /* all parameters are there */
503 ts->set_service_cb(ts->set_service_opaque, 0);
504 mpegts_close_filter(ts, ts->pmt_filter);
505 ts->pmt_filter = NULL;
508 static void pat_cb(void *opaque, const uint8_t *section, int section_len)
510 MpegTSContext *ts = opaque;
511 SectionHeader h1, *h = &h1;
512 const uint8_t *p, *p_end;
517 av_hex_dump(stdout, (uint8_t *)section, section_len);
519 p_end = section + section_len - 4;
521 if (parse_section_header(h, &p, p_end) < 0)
523 if (h->tid != PAT_TID)
527 sid = get16(&p, p_end);
530 pmt_pid = get16(&p, p_end) & 0x1fff;
534 printf("sid=0x%x pid=0x%x\n", sid, pmt_pid);
539 if (ts->req_sid == sid) {
540 ts->pmt_filter = mpegts_open_section_filter(ts, pmt_pid,
547 ts->set_service_cb(ts->set_service_opaque, -1);
550 mpegts_close_filter(ts, ts->pat_filter);
551 ts->pat_filter = NULL;
554 /* add all services found in the PAT */
555 static void pat_scan_cb(void *opaque, const uint8_t *section, int section_len)
557 MpegTSContext *ts = opaque;
558 SectionHeader h1, *h = &h1;
559 const uint8_t *p, *p_end;
561 char *provider_name, *name;
566 av_hex_dump(stdout, (uint8_t *)section, section_len);
568 p_end = section + section_len - 4;
570 if (parse_section_header(h, &p, p_end) < 0)
572 if (h->tid != PAT_TID)
576 sid = get16(&p, p_end);
579 pmt_pid = get16(&p, p_end) & 0x1fff;
583 printf("sid=0x%x pid=0x%x\n", sid, pmt_pid);
588 /* add the service with a dummy name */
589 snprintf(buf, sizeof(buf), "Service %x\n", sid);
590 name = av_strdup(buf);
591 provider_name = av_strdup("");
592 if (name && provider_name) {
593 new_service(ts, sid, provider_name, name);
596 av_freep(&provider_name);
603 mpegts_close_filter(ts, ts->pat_filter);
604 ts->pat_filter = NULL;
607 void mpegts_set_service(MpegTSContext *ts, int sid,
608 SetServiceCallback *set_service_cb, void *opaque)
610 ts->set_service_cb = set_service_cb;
611 ts->set_service_opaque = opaque;
613 ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
617 static void sdt_cb(void *opaque, const uint8_t *section, int section_len)
619 MpegTSContext *ts = opaque;
620 SectionHeader h1, *h = &h1;
621 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
622 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
623 char *name, *provider_name;
627 av_hex_dump(stdout, (uint8_t *)section, section_len);
630 p_end = section + section_len - 4;
632 if (parse_section_header(h, &p, p_end) < 0)
634 if (h->tid != SDT_TID)
636 onid = get16(&p, p_end);
639 val = get8(&p, p_end);
643 sid = get16(&p, p_end);
646 val = get8(&p, p_end);
649 desc_list_len = get16(&p, p_end) & 0xfff;
650 if (desc_list_len < 0)
652 desc_list_end = p + desc_list_len;
653 if (desc_list_end > p_end)
656 desc_tag = get8(&p, desc_list_end);
659 desc_len = get8(&p, desc_list_end);
660 desc_end = p + desc_len;
661 if (desc_end > desc_list_end)
664 printf("tag: 0x%02x len=%d\n", desc_tag, desc_len);
668 service_type = get8(&p, p_end);
669 if (service_type < 0)
671 provider_name = getstr8(&p, p_end);
674 name = getstr8(&p, p_end);
677 new_service(ts, sid, provider_name, name);
689 mpegts_close_filter(ts, ts->sdt_filter);
690 ts->sdt_filter = NULL;
693 /* scan services in a transport stream by looking at the SDT */
694 void mpegts_scan_sdt(MpegTSContext *ts)
696 ts->sdt_filter = mpegts_open_section_filter(ts, SDT_PID,
700 /* scan services in a transport stream by looking at the PAT (better
702 void mpegts_scan_pat(MpegTSContext *ts)
704 ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
708 /* TS stream handling */
712 MPEGTS_PESHEADER_FILL,
717 /* enough for PES header + length */
718 #define PES_START_SIZE 9
719 #define MAX_PES_HEADER_SIZE (9 + 255)
725 AVFormatContext *stream;
727 enum MpegTSState state;
728 /* used to get the format */
733 uint8_t header[MAX_PES_HEADER_SIZE];
736 static int64_t get_pts(const uint8_t *p)
741 pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
742 val = (p[1] << 8) | p[2];
743 pts |= (int64_t)(val >> 1) << 15;
744 val = (p[3] << 8) | p[4];
745 pts |= (int64_t)(val >> 1);
749 /* return non zero if a packet could be constructed */
750 static void mpegts_push_data(void *opaque,
751 const uint8_t *buf, int buf_size, int is_start)
753 PESContext *pes = opaque;
754 MpegTSContext *ts = pes->ts;
759 pes->state = MPEGTS_HEADER;
763 while (buf_size > 0) {
766 len = PES_START_SIZE - pes->data_index;
769 memcpy(pes->header + pes->data_index, p, len);
770 pes->data_index += len;
773 if (pes->data_index == PES_START_SIZE) {
774 /* we got all the PES or section header. We can now
777 av_hex_dump(pes->header, pes->data_index);
779 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
780 pes->header[2] == 0x01) {
781 /* it must be an mpeg2 PES stream */
782 code = pes->header[3] | 0x100;
783 if (!((code >= 0x1c0 && code <= 0x1df) ||
784 (code >= 0x1e0 && code <= 0x1ef) ||
788 /* allocate stream */
789 new_pes_av_stream(pes, code);
791 pes->state = MPEGTS_PESHEADER_FILL;
792 pes->total_size = (pes->header[4] << 8) | pes->header[5];
793 /* NOTE: a zero total size means the PES size is
796 pes->total_size += 6;
797 pes->pes_header_size = pes->header[8] + 9;
799 /* otherwise, it should be a table */
802 pes->state = MPEGTS_SKIP;
807 /**********************************************/
808 /* PES packing parsing */
809 case MPEGTS_PESHEADER_FILL:
810 len = pes->pes_header_size - pes->data_index;
813 memcpy(pes->header + pes->data_index, p, len);
814 pes->data_index += len;
817 if (pes->data_index == pes->pes_header_size) {
821 flags = pes->header[7];
823 pes->pts = AV_NOPTS_VALUE;
824 pes->dts = AV_NOPTS_VALUE;
825 if ((flags & 0xc0) == 0x80) {
826 pes->pts = get_pts(r);
828 } else if ((flags & 0xc0) == 0xc0) {
829 pes->pts = get_pts(r);
831 pes->dts = get_pts(r);
834 /* we got the full header. We parse it and get the payload */
835 pes->state = MPEGTS_PAYLOAD;
839 if (pes->total_size) {
840 len = pes->total_size - pes->data_index;
847 AVPacket *pkt = ts->pkt;
848 if (pes->st && av_new_packet(pkt, len) == 0) {
849 memcpy(pkt->data, p, len);
850 pkt->stream_index = pes->st->index;
853 /* reset pts values */
854 pes->pts = AV_NOPTS_VALUE;
855 pes->dts = AV_NOPTS_VALUE;
869 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
872 int codec_type, codec_id;
874 switch(pes->stream_type){
875 case STREAM_TYPE_AUDIO_MPEG1:
876 case STREAM_TYPE_AUDIO_MPEG2:
877 codec_type = CODEC_TYPE_AUDIO;
878 codec_id = CODEC_ID_MP3;
880 case STREAM_TYPE_VIDEO_MPEG1:
881 case STREAM_TYPE_VIDEO_MPEG2:
882 codec_type = CODEC_TYPE_VIDEO;
883 codec_id = CODEC_ID_MPEG2VIDEO;
885 case STREAM_TYPE_VIDEO_MPEG4:
886 codec_type = CODEC_TYPE_VIDEO;
887 codec_id = CODEC_ID_MPEG4;
889 case STREAM_TYPE_VIDEO_H264:
890 codec_type = CODEC_TYPE_VIDEO;
891 codec_id = CODEC_ID_H264;
893 case STREAM_TYPE_AUDIO_AAC:
894 codec_type = CODEC_TYPE_AUDIO;
895 codec_id = CODEC_ID_AAC;
897 case STREAM_TYPE_AUDIO_AC3:
898 codec_type = CODEC_TYPE_AUDIO;
899 codec_id = CODEC_ID_AC3;
901 case STREAM_TYPE_AUDIO_DTS:
902 codec_type = CODEC_TYPE_AUDIO;
903 codec_id = CODEC_ID_DTS;
905 case STREAM_TYPE_SUBTITLE_DVB:
906 codec_type = CODEC_TYPE_SUBTITLE;
907 codec_id = CODEC_ID_DVB_SUBTITLE;
910 if (code >= 0x1c0 && code <= 0x1df) {
911 codec_type = CODEC_TYPE_AUDIO;
912 codec_id = CODEC_ID_MP2;
913 } else if (code == 0x1bd) {
914 codec_type = CODEC_TYPE_AUDIO;
915 codec_id = CODEC_ID_AC3;
917 codec_type = CODEC_TYPE_VIDEO;
918 codec_id = CODEC_ID_MPEG1VIDEO;
922 st = av_new_stream(pes->stream, pes->pid);
924 av_set_pts_info(st, 33, 1, 90000);
926 st->codec->codec_type = codec_type;
927 st->codec->codec_id = codec_id;
928 st->need_parsing = 1;
935 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int stream_type)
940 /* if no pid found, then add a pid context */
941 pes = av_mallocz(sizeof(PESContext));
945 pes->stream = ts->stream;
947 pes->stream_type = stream_type;
948 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
956 /* handle one TS packet */
957 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
959 AVFormatContext *s = ts->stream;
961 int len, pid, cc, cc_ok, afc, is_start;
962 const uint8_t *p, *p_end;
964 pid = ((packet[1] & 0x1f) << 8) | packet[2];
965 is_start = packet[1] & 0x40;
967 if (ts->auto_guess && tss == NULL && is_start) {
968 add_pes_stream(ts, pid, 0);
974 /* continuity check (currently not used) */
975 cc = (packet[3] & 0xf);
976 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
979 /* skip adaptation field */
980 afc = (packet[3] >> 4) & 3;
982 if (afc == 0) /* reserved value */
984 if (afc == 2) /* adaptation field only */
987 /* skip adapation field */
990 /* if past the end of packet, ignore */
991 p_end = packet + TS_PACKET_SIZE;
995 if (tss->type == MPEGTS_SECTION) {
997 /* pointer field present */
1002 /* write remaining section bytes */
1003 write_section_data(s, tss,
1005 /* check whether filter has been closed */
1011 write_section_data(s, tss,
1016 write_section_data(s, tss,
1021 tss->u.pes_filter.pes_cb(tss->u.pes_filter.opaque,
1022 p, p_end - p, is_start);
1026 /* XXX: try to find a better synchro over several packets (use
1027 get_packet_size() ?) */
1028 static int mpegts_resync(ByteIOContext *pb)
1032 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1037 url_fseek(pb, -1, SEEK_CUR);
1045 /* return -1 if error or EOF. Return 0 if OK. */
1046 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1051 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1052 if (len != TS_PACKET_SIZE)
1054 /* check paquet sync byte */
1055 if (buf[0] != 0x47) {
1056 /* find a new packet start */
1057 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1058 if (mpegts_resync(pb) < 0)
1059 return AVERROR_INVALIDDATA;
1063 skip = raw_packet_size - TS_PACKET_SIZE;
1065 url_fskip(pb, skip);
1072 static int handle_packets(MpegTSContext *ts, int nb_packets)
1074 AVFormatContext *s = ts->stream;
1075 ByteIOContext *pb = &s->pb;
1076 uint8_t packet[TS_PACKET_SIZE];
1077 int packet_num, ret;
1085 if (nb_packets != 0 && packet_num >= nb_packets)
1087 ret = read_packet(pb, packet, ts->raw_packet_size);
1090 handle_packet(ts, packet);
1095 static int mpegts_probe(AVProbeData *p)
1098 const int size= p->buf_size;
1099 int score, fec_score, dvhs_score;
1100 #define CHECK_COUNT 10
1102 if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))
1105 score = analyze(p->buf, TS_PACKET_SIZE *CHECK_COUNT, TS_PACKET_SIZE, NULL);
1106 dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);
1107 fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);
1108 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1110 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1111 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1112 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1113 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1116 /* only use the extension for safer guess */
1117 if (match_ext(p->filename, "ts"))
1118 return AVPROBE_SCORE_MAX;
1124 void set_service_cb(void *opaque, int ret)
1126 MpegTSContext *ts = opaque;
1127 ts->set_service_ret = ret;
1131 /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return
1132 (-1) if not available */
1133 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1134 const uint8_t *packet)
1136 int afc, len, flags;
1140 afc = (packet[3] >> 4) & 3;
1150 if (!(flags & 0x10))
1154 v = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
1155 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1156 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1160 static int mpegts_read_header(AVFormatContext *s,
1161 AVFormatParameters *ap)
1163 MpegTSContext *ts = s->priv_data;
1164 ByteIOContext *pb = &s->pb;
1168 MpegTSService *service;
1171 ts->mpeg2ts_raw = ap->mpeg2ts_raw;
1172 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1175 /* read the first 1024 bytes to get packet size */
1176 pos = url_ftell(pb);
1177 len = get_buffer(pb, buf, sizeof(buf));
1178 if (len != sizeof(buf))
1180 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1181 if (ts->raw_packet_size <= 0)
1187 if (!ts->mpeg2ts_raw) {
1190 if (!ts->auto_guess) {
1191 ts->set_service_ret = -1;
1193 /* first do a scaning to get all the services */
1194 url_fseek(pb, pos, SEEK_SET);
1195 mpegts_scan_sdt(ts);
1197 handle_packets(ts, MAX_SCAN_PACKETS);
1199 if (ts->nb_services <= 0) {
1200 /* no SDT found, we try to look at the PAT */
1202 /* First remove the SDT filters from each PID */
1204 for (i=0; i < NB_PID_MAX; i++) {
1206 mpegts_close_filter(ts, ts->pids[i]);
1208 url_fseek(pb, pos, SEEK_SET);
1209 mpegts_scan_pat(ts);
1211 handle_packets(ts, MAX_SCAN_PACKETS);
1214 if (ts->nb_services <= 0) {
1215 /* raw transport stream */
1217 s->ctx_flags |= AVFMTCTX_NOHEADER;
1221 /* tune to first service found */
1222 for(i=0; i<ts->nb_services && ts->set_service_ret; i++){
1223 service = ts->services[i];
1226 printf("tuning to '%s'\n", service->name);
1229 /* now find the info for the first service if we found any,
1230 otherwise try to filter all PATs */
1232 url_fseek(pb, pos, SEEK_SET);
1233 mpegts_set_service(ts, sid, set_service_cb, ts);
1235 handle_packets(ts, MAX_SCAN_PACKETS);
1237 /* if could not find service, exit */
1239 if (ts->set_service_ret != 0) {
1243 //let's retry with auto_guess set
1245 goto goto_auto_guess;
1250 printf("tuning done\n");
1253 s->ctx_flags |= AVFMTCTX_NOHEADER;
1256 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1257 int64_t pcrs[2], pcr_h;
1258 int packet_count[2];
1259 uint8_t packet[TS_PACKET_SIZE];
1261 /* only read packets */
1264 st = av_new_stream(s, 0);
1267 av_set_pts_info(st, 60, 1, 27000000);
1268 st->codec->codec_type = CODEC_TYPE_DATA;
1269 st->codec->codec_id = CODEC_ID_MPEG2TS;
1271 /* we iterate until we find two PCRs to estimate the bitrate */
1276 ret = read_packet(&s->pb, packet, ts->raw_packet_size);
1279 pid = ((packet[1] & 0x1f) << 8) | packet[2];
1280 if ((pcr_pid == -1 || pcr_pid == pid) &&
1281 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1283 packet_count[nb_pcrs] = nb_packets;
1284 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1291 ts->pcr_pid = pcr_pid;
1293 /* NOTE1: the bitrate is computed without the FEC */
1294 /* NOTE2: it is only the bitrate of the start of the stream */
1295 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1296 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1297 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1298 st->codec->bit_rate = s->bit_rate;
1299 st->start_time = ts->cur_pcr;
1301 printf("start=%0.3f pcr=%0.3f incr=%d\n",
1302 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1306 url_fseek(pb, pos, SEEK_SET);
1312 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1314 static int mpegts_raw_read_packet(AVFormatContext *s,
1317 MpegTSContext *ts = s->priv_data;
1319 int64_t pcr_h, next_pcr_h, pos;
1320 int pcr_l, next_pcr_l;
1321 uint8_t pcr_buf[12];
1323 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1325 pkt->pos= url_ftell(&s->pb);
1326 ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size);
1328 av_free_packet(pkt);
1331 if (ts->mpeg2ts_compute_pcr) {
1332 /* compute exact PCR for each packet */
1333 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1334 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1335 pos = url_ftell(&s->pb);
1336 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1337 url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1338 get_buffer(&s->pb, pcr_buf, 12);
1339 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1340 /* XXX: not precise enough */
1341 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1346 url_fseek(&s->pb, pos, SEEK_SET);
1347 /* no next PCR found: we use previous increment */
1348 ts->cur_pcr = pcr_h * 300 + pcr_l;
1350 pkt->pts = ts->cur_pcr;
1351 pkt->duration = ts->pcr_incr;
1352 ts->cur_pcr += ts->pcr_incr;
1354 pkt->stream_index = 0;
1358 static int mpegts_read_packet(AVFormatContext *s,
1361 MpegTSContext *ts = s->priv_data;
1363 if (!ts->mpeg2ts_raw) {
1365 return handle_packets(ts, 0);
1367 return mpegts_raw_read_packet(s, pkt);
1371 static int mpegts_read_close(AVFormatContext *s)
1373 MpegTSContext *ts = s->priv_data;
1375 for(i=0;i<NB_PID_MAX;i++)
1376 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1380 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1381 int64_t *ppos, int64_t pos_limit)
1383 MpegTSContext *ts = s->priv_data;
1384 int64_t pos, timestamp;
1385 uint8_t buf[TS_PACKET_SIZE];
1387 const int find_next= 1;
1388 pos = ((*ppos + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size;
1391 url_fseek(&s->pb, pos, SEEK_SET);
1392 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1393 return AV_NOPTS_VALUE;
1394 pid = ((buf[1] & 0x1f) << 8) | buf[2];
1395 if (pid == ts->pcr_pid &&
1396 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1399 pos += ts->raw_packet_size;
1403 pos -= ts->raw_packet_size;
1405 return AV_NOPTS_VALUE;
1406 url_fseek(&s->pb, pos, SEEK_SET);
1407 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1408 return AV_NOPTS_VALUE;
1409 pid = ((buf[1] & 0x1f) << 8) | buf[2];
1410 if (pid == ts->pcr_pid &&
1411 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1421 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1422 MpegTSContext *ts = s->priv_data;
1423 uint8_t buf[TS_PACKET_SIZE];
1426 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1429 pos= url_ftell(&s->pb);
1432 url_fseek(&s->pb, pos, SEEK_SET);
1433 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1435 // pid = ((buf[1] & 0x1f) << 8) | buf[2];
1436 if(buf[1] & 0x40) break;
1437 pos += ts->raw_packet_size;
1439 url_fseek(&s->pb, pos, SEEK_SET);
1444 /**************************************************************/
1445 /* parsing functions - called from other demuxers such as RTP */
1447 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1451 ts = av_mallocz(sizeof(MpegTSContext));
1454 /* no stream case, currently used by RTP */
1455 ts->raw_packet_size = TS_PACKET_SIZE;
1461 /* return the consumed length if a packet was output, or -1 if no
1463 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1464 const uint8_t *buf, int len)
1474 if (len < TS_PACKET_SIZE)
1476 if (buf[0] != 0x47) {
1480 handle_packet(ts, buf);
1481 buf += TS_PACKET_SIZE;
1482 len -= TS_PACKET_SIZE;
1488 void mpegts_parse_close(MpegTSContext *ts)
1492 for(i=0;i<NB_PID_MAX;i++)
1493 av_free(ts->pids[i]);
1497 AVInputFormat mpegts_demux = {
1499 "MPEG2 transport stream format",
1500 sizeof(MpegTSContext),
1507 .flags = AVFMT_SHOW_IDS,
1510 int mpegts_init(void)
1512 av_register_input_format(&mpegts_demux);
1513 #ifdef CONFIG_MUXERS
1514 av_register_output_format(&mpegts_mux);