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.
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* 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
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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);
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typedef struct MpegTSPESFilter {
50
typedef void SectionCallback(void *opaque, const uint8_t *buf, int len);
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typedef void SetServiceCallback(void *opaque, int ret);
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typedef struct MpegTSSectionFilter {
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int end_of_section_reached:1;
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SectionCallback *section_cb;
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} MpegTSSectionFilter;
64
typedef struct MpegTSFilter {
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int last_cc; /* last cc code (-1 if first packet) */
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enum MpegTSFilterType type;
69
MpegTSPESFilter pes_filter;
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MpegTSSectionFilter section_filter;
74
typedef struct MpegTSService {
81
struct MpegTSContext {
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AVFormatContext *stream;
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int raw_packet_size; /* raw packet size, including FEC if present */
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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;
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MpegTSService **services;
107
/* set service context (XXX: allocated it ?) */
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SetServiceCallback *set_service_cb;
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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,
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const uint8_t *buf, int buf_size, int is_start)
120
MpegTSSectionFilter *tss = &tss1->u.section_filter;
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memcpy(tss->section_buf, buf, buf_size);
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tss->section_index = buf_size;
126
tss->section_h_size = -1;
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tss->end_of_section_reached = 0;
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if (tss->end_of_section_reached)
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len = 4096 - tss->section_index;
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memcpy(tss->section_buf + tss->section_index, buf, len);
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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;
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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,
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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])
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filter = av_mallocz(sizeof(MpegTSFilter));
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ts->pids[pid] = filter;
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filter->type = MPEGTS_SECTION;
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filter->last_cc = -1;
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sec = &filter->u.section_filter;
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sec->section_cb = section_cb;
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sec->opaque = opaque;
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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;
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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;
251
if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
254
score = analyze(buf, size, TS_PACKET_SIZE, NULL);
255
fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
256
// av_log(NULL, AV_LOG_DEBUG, "score: %d, fec_score: %d \n", score, fec_score);
258
if (score > fec_score) return TS_PACKET_SIZE;
259
else if(score < fec_score) return TS_FEC_PACKET_SIZE;
263
typedef struct SectionHeader {
268
uint8_t last_sec_num;
271
static inline int get8(const uint8_t **pp, const uint8_t *p_end)
284
static inline int get16(const uint8_t **pp, const uint8_t *p_end)
290
if ((p + 1) >= p_end)
292
c = (p[0] << 8) | p[1];
298
/* read and allocate a DVB string preceeded by its length */
299
static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
306
len = get8(&p, p_end);
309
if ((p + len) > p_end)
311
str = av_malloc(len + 1);
321
static int parse_section_header(SectionHeader *h,
322
const uint8_t **pp, const uint8_t *p_end)
326
val = get8(pp, p_end);
331
val = get16(pp, p_end);
335
val = get8(pp, p_end);
338
h->version = (val >> 1) & 0x1f;
339
val = get8(pp, p_end);
343
val = get8(pp, p_end);
346
h->last_sec_num = val;
350
static MpegTSService *new_service(MpegTSContext *ts, int sid,
351
char *provider_name, char *name)
353
MpegTSService *service;
356
printf("new_service: sid=0x%04x provider='%s' name='%s'\n",
357
sid, provider_name, name);
360
service = av_mallocz(sizeof(MpegTSService));
364
service->provider_name = provider_name;
365
service->name = name;
366
dynarray_add(&ts->services, &ts->nb_services, service);
370
static void pmt_cb(void *opaque, const uint8_t *section, int section_len)
372
MpegTSContext *ts = opaque;
373
SectionHeader h1, *h = &h1;
376
const uint8_t *p, *p_end, *desc_list_end, *desc_end;
377
int program_info_length, pcr_pid, pid, stream_type;
378
int desc_list_len, desc_len, desc_tag;
379
int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
384
av_hex_dump(stdout, (uint8_t *)section, section_len);
386
p_end = section + section_len - 4;
388
if (parse_section_header(h, &p, p_end) < 0)
391
printf("sid=0x%x sec_num=%d/%d\n", h->id, h->sec_num, h->last_sec_num);
393
if (h->tid != PMT_TID || (ts->req_sid >= 0 && h->id != ts->req_sid) )
396
pcr_pid = get16(&p, p_end) & 0x1fff;
399
ts->pcr_pid = pcr_pid;
401
printf("pcr_pid=0x%x\n", pcr_pid);
403
program_info_length = get16(&p, p_end) & 0xfff;
404
if (program_info_length < 0)
406
p += program_info_length;
412
stream_type = get8(&p, p_end);
415
pid = get16(&p, p_end) & 0x1fff;
418
desc_list_len = get16(&p, p_end) & 0xfff;
419
if (desc_list_len < 0)
421
desc_list_end = p + desc_list_len;
422
if (desc_list_end > p_end)
425
desc_tag = get8(&p, desc_list_end);
428
desc_len = get8(&p, desc_list_end);
429
desc_end = p + desc_len;
430
if (desc_end > desc_list_end)
433
printf("tag: 0x%02x len=%d\n", desc_tag, desc_len);
436
case DVB_SUBT_DESCID:
437
if (stream_type == STREAM_TYPE_PRIVATE_DATA)
438
stream_type = STREAM_TYPE_SUBTITLE_DVB;
440
language[0] = get8(&p, desc_end);
441
language[1] = get8(&p, desc_end);
442
language[2] = get8(&p, desc_end);
445
comp_page = get16(&p, desc_end);
446
anc_page = get16(&p, desc_end);
449
case 0x0a: /* ISO 639 language descriptor */
450
language[0] = get8(&p, desc_end);
451
language[1] = get8(&p, desc_end);
452
language[2] = get8(&p, desc_end);
463
printf("stream_type=%d pid=0x%x\n", stream_type, pid);
466
/* now create ffmpeg stream */
467
switch(stream_type) {
468
case STREAM_TYPE_AUDIO_MPEG1:
469
case STREAM_TYPE_AUDIO_MPEG2:
470
case STREAM_TYPE_VIDEO_MPEG1:
471
case STREAM_TYPE_VIDEO_MPEG2:
472
case STREAM_TYPE_VIDEO_MPEG4:
473
case STREAM_TYPE_VIDEO_H264:
474
case STREAM_TYPE_AUDIO_AAC:
475
case STREAM_TYPE_AUDIO_AC3:
476
case STREAM_TYPE_AUDIO_DTS:
477
case STREAM_TYPE_SUBTITLE_DVB:
478
pes = add_pes_stream(ts, pid, stream_type);
480
st = new_pes_av_stream(pes, 0);
483
/* we ignore the other streams */
488
if (language[0] != 0) {
489
st->language[0] = language[0];
490
st->language[1] = language[1];
491
st->language[2] = language[2];
492
st->language[3] = language[3];
495
if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
496
st->codec->sub_id = (anc_page << 16) | comp_page;
500
/* all parameters are there */
501
ts->set_service_cb(ts->set_service_opaque, 0);
502
mpegts_close_filter(ts, ts->pmt_filter);
503
ts->pmt_filter = NULL;
506
static void pat_cb(void *opaque, const uint8_t *section, int section_len)
508
MpegTSContext *ts = opaque;
509
SectionHeader h1, *h = &h1;
510
const uint8_t *p, *p_end;
515
av_hex_dump(stdout, (uint8_t *)section, section_len);
517
p_end = section + section_len - 4;
519
if (parse_section_header(h, &p, p_end) < 0)
521
if (h->tid != PAT_TID)
525
sid = get16(&p, p_end);
528
pmt_pid = get16(&p, p_end) & 0x1fff;
532
printf("sid=0x%x pid=0x%x\n", sid, pmt_pid);
537
if (ts->req_sid == sid) {
538
ts->pmt_filter = mpegts_open_section_filter(ts, pmt_pid,
545
ts->set_service_cb(ts->set_service_opaque, -1);
548
mpegts_close_filter(ts, ts->pat_filter);
549
ts->pat_filter = NULL;
552
/* add all services found in the PAT */
553
static void pat_scan_cb(void *opaque, const uint8_t *section, int section_len)
555
MpegTSContext *ts = opaque;
556
SectionHeader h1, *h = &h1;
557
const uint8_t *p, *p_end;
559
char *provider_name, *name;
564
av_hex_dump(stdout, (uint8_t *)section, section_len);
566
p_end = section + section_len - 4;
568
if (parse_section_header(h, &p, p_end) < 0)
570
if (h->tid != PAT_TID)
574
sid = get16(&p, p_end);
577
pmt_pid = get16(&p, p_end) & 0x1fff;
581
printf("sid=0x%x pid=0x%x\n", sid, pmt_pid);
586
/* add the service with a dummy name */
587
snprintf(buf, sizeof(buf), "Service %x\n", sid);
588
name = av_strdup(buf);
589
provider_name = av_strdup("");
590
if (name && provider_name) {
591
new_service(ts, sid, provider_name, name);
594
av_freep(&provider_name);
601
mpegts_close_filter(ts, ts->pat_filter);
602
ts->pat_filter = NULL;
605
void mpegts_set_service(MpegTSContext *ts, int sid,
606
SetServiceCallback *set_service_cb, void *opaque)
608
ts->set_service_cb = set_service_cb;
609
ts->set_service_opaque = opaque;
611
ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
615
static void sdt_cb(void *opaque, const uint8_t *section, int section_len)
617
MpegTSContext *ts = opaque;
618
SectionHeader h1, *h = &h1;
619
const uint8_t *p, *p_end, *desc_list_end, *desc_end;
620
int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
621
char *name, *provider_name;
625
av_hex_dump(stdout, (uint8_t *)section, section_len);
628
p_end = section + section_len - 4;
630
if (parse_section_header(h, &p, p_end) < 0)
632
if (h->tid != SDT_TID)
634
onid = get16(&p, p_end);
637
val = get8(&p, p_end);
641
sid = get16(&p, p_end);
644
val = get8(&p, p_end);
647
desc_list_len = get16(&p, p_end) & 0xfff;
648
if (desc_list_len < 0)
650
desc_list_end = p + desc_list_len;
651
if (desc_list_end > p_end)
654
desc_tag = get8(&p, desc_list_end);
657
desc_len = get8(&p, desc_list_end);
658
desc_end = p + desc_len;
659
if (desc_end > desc_list_end)
662
printf("tag: 0x%02x len=%d\n", desc_tag, desc_len);
666
service_type = get8(&p, p_end);
667
if (service_type < 0)
669
provider_name = getstr8(&p, p_end);
672
name = getstr8(&p, p_end);
675
new_service(ts, sid, provider_name, name);
687
mpegts_close_filter(ts, ts->sdt_filter);
688
ts->sdt_filter = NULL;
691
/* scan services in a transport stream by looking at the SDT */
692
void mpegts_scan_sdt(MpegTSContext *ts)
694
ts->sdt_filter = mpegts_open_section_filter(ts, SDT_PID,
698
/* scan services in a transport stream by looking at the PAT (better
700
void mpegts_scan_pat(MpegTSContext *ts)
702
ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
706
/* TS stream handling */
710
MPEGTS_PESHEADER_FILL,
715
/* enough for PES header + length */
716
#define PES_START_SIZE 9
717
#define MAX_PES_HEADER_SIZE (9 + 255)
723
AVFormatContext *stream;
725
enum MpegTSState state;
726
/* used to get the format */
731
uint8_t header[MAX_PES_HEADER_SIZE];
734
static int64_t get_pts(const uint8_t *p)
739
pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
740
val = (p[1] << 8) | p[2];
741
pts |= (int64_t)(val >> 1) << 15;
742
val = (p[3] << 8) | p[4];
743
pts |= (int64_t)(val >> 1);
747
/* return non zero if a packet could be constructed */
748
static void mpegts_push_data(void *opaque,
749
const uint8_t *buf, int buf_size, int is_start)
751
PESContext *pes = opaque;
752
MpegTSContext *ts = pes->ts;
757
pes->state = MPEGTS_HEADER;
761
while (buf_size > 0) {
764
len = PES_START_SIZE - pes->data_index;
767
memcpy(pes->header + pes->data_index, p, len);
768
pes->data_index += len;
771
if (pes->data_index == PES_START_SIZE) {
772
/* we got all the PES or section header. We can now
775
av_hex_dump(pes->header, pes->data_index);
777
if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
778
pes->header[2] == 0x01) {
779
/* it must be an mpeg2 PES stream */
780
code = pes->header[3] | 0x100;
781
if (!((code >= 0x1c0 && code <= 0x1df) ||
782
(code >= 0x1e0 && code <= 0x1ef) ||
786
/* allocate stream */
787
new_pes_av_stream(pes, code);
789
pes->state = MPEGTS_PESHEADER_FILL;
790
pes->total_size = (pes->header[4] << 8) | pes->header[5];
791
/* NOTE: a zero total size means the PES size is
794
pes->total_size += 6;
795
pes->pes_header_size = pes->header[8] + 9;
797
/* otherwise, it should be a table */
800
pes->state = MPEGTS_SKIP;
805
/**********************************************/
806
/* PES packing parsing */
807
case MPEGTS_PESHEADER_FILL:
808
len = pes->pes_header_size - pes->data_index;
811
memcpy(pes->header + pes->data_index, p, len);
812
pes->data_index += len;
815
if (pes->data_index == pes->pes_header_size) {
819
flags = pes->header[7];
821
pes->pts = AV_NOPTS_VALUE;
822
pes->dts = AV_NOPTS_VALUE;
823
if ((flags & 0xc0) == 0x80) {
824
pes->pts = get_pts(r);
826
} else if ((flags & 0xc0) == 0xc0) {
827
pes->pts = get_pts(r);
829
pes->dts = get_pts(r);
832
/* we got the full header. We parse it and get the payload */
833
pes->state = MPEGTS_PAYLOAD;
837
if (pes->total_size) {
838
len = pes->total_size - pes->data_index;
845
AVPacket *pkt = ts->pkt;
846
if (pes->st && av_new_packet(pkt, len) == 0) {
847
memcpy(pkt->data, p, len);
848
pkt->stream_index = pes->st->index;
851
/* reset pts values */
852
pes->pts = AV_NOPTS_VALUE;
853
pes->dts = AV_NOPTS_VALUE;
867
static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
870
int codec_type, codec_id;
872
switch(pes->stream_type){
873
case STREAM_TYPE_AUDIO_MPEG1:
874
case STREAM_TYPE_AUDIO_MPEG2:
875
codec_type = CODEC_TYPE_AUDIO;
876
codec_id = CODEC_ID_MP3;
878
case STREAM_TYPE_VIDEO_MPEG1:
879
case STREAM_TYPE_VIDEO_MPEG2:
880
codec_type = CODEC_TYPE_VIDEO;
881
codec_id = CODEC_ID_MPEG2VIDEO;
883
case STREAM_TYPE_VIDEO_MPEG4:
884
codec_type = CODEC_TYPE_VIDEO;
885
codec_id = CODEC_ID_MPEG4;
887
case STREAM_TYPE_VIDEO_H264:
888
codec_type = CODEC_TYPE_VIDEO;
889
codec_id = CODEC_ID_H264;
891
case STREAM_TYPE_AUDIO_AAC:
892
codec_type = CODEC_TYPE_AUDIO;
893
codec_id = CODEC_ID_AAC;
895
case STREAM_TYPE_AUDIO_AC3:
896
codec_type = CODEC_TYPE_AUDIO;
897
codec_id = CODEC_ID_AC3;
899
case STREAM_TYPE_AUDIO_DTS:
900
codec_type = CODEC_TYPE_AUDIO;
901
codec_id = CODEC_ID_DTS;
903
case STREAM_TYPE_SUBTITLE_DVB:
904
codec_type = CODEC_TYPE_SUBTITLE;
905
codec_id = CODEC_ID_DVB_SUBTITLE;
908
if (code >= 0x1c0 && code <= 0x1df) {
909
codec_type = CODEC_TYPE_AUDIO;
910
codec_id = CODEC_ID_MP2;
911
} else if (code == 0x1bd) {
912
codec_type = CODEC_TYPE_AUDIO;
913
codec_id = CODEC_ID_AC3;
915
codec_type = CODEC_TYPE_VIDEO;
916
codec_id = CODEC_ID_MPEG1VIDEO;
920
st = av_new_stream(pes->stream, pes->pid);
922
av_set_pts_info(st, 33, 1, 90000);
924
st->codec->codec_type = codec_type;
925
st->codec->codec_id = codec_id;
926
st->need_parsing = 1;
933
static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int stream_type)
938
/* if no pid found, then add a pid context */
939
pes = av_mallocz(sizeof(PESContext));
943
pes->stream = ts->stream;
945
pes->stream_type = stream_type;
946
tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
954
/* handle one TS packet */
955
static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
957
AVFormatContext *s = ts->stream;
959
int len, pid, cc, cc_ok, afc, is_start;
960
const uint8_t *p, *p_end;
962
pid = ((packet[1] & 0x1f) << 8) | packet[2];
963
is_start = packet[1] & 0x40;
965
if (ts->auto_guess && tss == NULL && is_start) {
966
add_pes_stream(ts, pid, 0);
972
/* continuity check (currently not used) */
973
cc = (packet[3] & 0xf);
974
cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
977
/* skip adaptation field */
978
afc = (packet[3] >> 4) & 3;
980
if (afc == 0) /* reserved value */
982
if (afc == 2) /* adaptation field only */
985
/* skip adapation field */
988
/* if past the end of packet, ignore */
989
p_end = packet + TS_PACKET_SIZE;
993
if (tss->type == MPEGTS_SECTION) {
995
/* pointer field present */
1000
/* write remaining section bytes */
1001
write_section_data(s, tss,
1003
/* check whether filter has been closed */
1009
write_section_data(s, tss,
1014
write_section_data(s, tss,
1019
tss->u.pes_filter.pes_cb(tss->u.pes_filter.opaque,
1020
p, p_end - p, is_start);
1024
/* XXX: try to find a better synchro over several packets (use
1025
get_packet_size() ?) */
1026
static int mpegts_resync(ByteIOContext *pb)
1030
for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1035
url_fseek(pb, -1, SEEK_CUR);
1043
/* return -1 if error or EOF. Return 0 if OK. */
1044
static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1049
len = get_buffer(pb, buf, TS_PACKET_SIZE);
1050
if (len != TS_PACKET_SIZE)
1052
/* check paquet sync byte */
1053
if (buf[0] != 0x47) {
1054
/* find a new packet start */
1055
url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1056
if (mpegts_resync(pb) < 0)
1057
return AVERROR_INVALIDDATA;
1061
skip = raw_packet_size - TS_PACKET_SIZE;
1063
url_fskip(pb, skip);
1070
static int handle_packets(MpegTSContext *ts, int nb_packets)
1072
AVFormatContext *s = ts->stream;
1073
ByteIOContext *pb = &s->pb;
1074
uint8_t packet[TS_PACKET_SIZE];
1075
int packet_num, ret;
1083
if (nb_packets != 0 && packet_num >= nb_packets)
1085
ret = read_packet(pb, packet, ts->raw_packet_size);
1088
handle_packet(ts, packet);
1093
static int mpegts_probe(AVProbeData *p)
1096
const int size= p->buf_size;
1097
int score, fec_score;
1098
#define CHECK_COUNT 10
1100
if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))
1103
score = analyze(p->buf, TS_PACKET_SIZE *CHECK_COUNT, TS_PACKET_SIZE, NULL);
1104
fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);
1105
// av_log(NULL, AV_LOG_DEBUG, "score: %d, fec_score: %d \n", score, fec_score);
1107
// we need a clear definition for the returned score otherwise things will become messy sooner or later
1108
if (score > fec_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1109
else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1112
/* only use the extension for safer guess */
1113
if (match_ext(p->filename, "ts"))
1114
return AVPROBE_SCORE_MAX;
1120
void set_service_cb(void *opaque, int ret)
1122
MpegTSContext *ts = opaque;
1123
ts->set_service_ret = ret;
1127
/* return the 90 kHz PCR and the extension for the 27 MHz PCR. return
1128
(-1) if not available */
1129
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1130
const uint8_t *packet)
1132
int afc, len, flags;
1136
afc = (packet[3] >> 4) & 3;
1146
if (!(flags & 0x10))
1150
v = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
1151
*ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1152
*ppcr_low = ((p[4] & 1) << 8) | p[5];
1156
static int mpegts_read_header(AVFormatContext *s,
1157
AVFormatParameters *ap)
1159
MpegTSContext *ts = s->priv_data;
1160
ByteIOContext *pb = &s->pb;
1164
MpegTSService *service;
1167
ts->mpeg2ts_raw = ap->mpeg2ts_raw;
1168
ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1171
/* read the first 1024 bytes to get packet size */
1172
pos = url_ftell(pb);
1173
len = get_buffer(pb, buf, sizeof(buf));
1174
if (len != sizeof(buf))
1176
ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1177
if (ts->raw_packet_size <= 0)
1182
if (!ts->mpeg2ts_raw) {
1185
if (!ts->auto_guess) {
1186
ts->set_service_ret = -1;
1188
/* first do a scaning to get all the services */
1189
url_fseek(pb, pos, SEEK_SET);
1190
mpegts_scan_sdt(ts);
1192
handle_packets(ts, MAX_SCAN_PACKETS);
1194
if (ts->nb_services <= 0) {
1195
/* no SDT found, we try to look at the PAT */
1197
/* First remove the SDT filters from each PID */
1199
for (i=0; i < NB_PID_MAX; i++) {
1201
mpegts_close_filter(ts, ts->pids[i]);
1203
url_fseek(pb, pos, SEEK_SET);
1204
mpegts_scan_pat(ts);
1206
handle_packets(ts, MAX_SCAN_PACKETS);
1209
if (ts->nb_services <= 0) {
1210
/* raw transport stream */
1212
s->ctx_flags |= AVFMTCTX_NOHEADER;
1216
/* tune to first service found */
1217
for(i=0; i<ts->nb_services && ts->set_service_ret; i++){
1218
service = ts->services[i];
1221
printf("tuning to '%s'\n", service->name);
1224
/* now find the info for the first service if we found any,
1225
otherwise try to filter all PATs */
1227
url_fseek(pb, pos, SEEK_SET);
1228
mpegts_set_service(ts, sid, set_service_cb, ts);
1230
handle_packets(ts, MAX_SCAN_PACKETS);
1232
/* if could not find service, exit */
1234
if (ts->set_service_ret != 0)
1238
printf("tuning done\n");
1241
s->ctx_flags |= AVFMTCTX_NOHEADER;
1244
int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1245
int64_t pcrs[2], pcr_h;
1246
int packet_count[2];
1247
uint8_t packet[TS_PACKET_SIZE];
1249
/* only read packets */
1252
st = av_new_stream(s, 0);
1255
av_set_pts_info(st, 60, 1, 27000000);
1256
st->codec->codec_type = CODEC_TYPE_DATA;
1257
st->codec->codec_id = CODEC_ID_MPEG2TS;
1259
/* we iterate until we find two PCRs to estimate the bitrate */
1264
ret = read_packet(&s->pb, packet, ts->raw_packet_size);
1267
pid = ((packet[1] & 0x1f) << 8) | packet[2];
1268
if ((pcr_pid == -1 || pcr_pid == pid) &&
1269
parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1271
packet_count[nb_pcrs] = nb_packets;
1272
pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1279
ts->pcr_pid = pcr_pid;
1281
/* NOTE1: the bitrate is computed without the FEC */
1282
/* NOTE2: it is only the bitrate of the start of the stream */
1283
ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1284
ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1285
s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1286
st->codec->bit_rate = s->bit_rate;
1287
st->start_time = ts->cur_pcr;
1289
printf("start=%0.3f pcr=%0.3f incr=%d\n",
1290
st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1294
url_fseek(pb, pos, SEEK_SET);
1300
#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1302
static int mpegts_raw_read_packet(AVFormatContext *s,
1305
MpegTSContext *ts = s->priv_data;
1307
int64_t pcr_h, next_pcr_h, pos;
1308
int pcr_l, next_pcr_l;
1309
uint8_t pcr_buf[12];
1311
if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1313
pkt->pos= url_ftell(&s->pb);
1314
ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size);
1316
av_free_packet(pkt);
1319
if (ts->mpeg2ts_compute_pcr) {
1320
/* compute exact PCR for each packet */
1321
if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1322
/* we read the next PCR (XXX: optimize it by using a bigger buffer */
1323
pos = url_ftell(&s->pb);
1324
for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1325
url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1326
get_buffer(&s->pb, pcr_buf, 12);
1327
if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1328
/* XXX: not precise enough */
1329
ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1334
url_fseek(&s->pb, pos, SEEK_SET);
1335
/* no next PCR found: we use previous increment */
1336
ts->cur_pcr = pcr_h * 300 + pcr_l;
1338
pkt->pts = ts->cur_pcr;
1339
pkt->duration = ts->pcr_incr;
1340
ts->cur_pcr += ts->pcr_incr;
1342
pkt->stream_index = 0;
1346
static int mpegts_read_packet(AVFormatContext *s,
1349
MpegTSContext *ts = s->priv_data;
1351
if (!ts->mpeg2ts_raw) {
1353
return handle_packets(ts, 0);
1355
return mpegts_raw_read_packet(s, pkt);
1359
static int mpegts_read_close(AVFormatContext *s)
1361
MpegTSContext *ts = s->priv_data;
1363
for(i=0;i<NB_PID_MAX;i++)
1364
if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1368
static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1369
int64_t *ppos, int64_t pos_limit)
1371
MpegTSContext *ts = s->priv_data;
1372
int64_t pos, timestamp;
1373
uint8_t buf[TS_PACKET_SIZE];
1375
const int find_next= 1;
1376
pos = ((*ppos + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size;
1379
url_fseek(&s->pb, pos, SEEK_SET);
1380
if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1381
return AV_NOPTS_VALUE;
1382
pid = ((buf[1] & 0x1f) << 8) | buf[2];
1383
if (pid == ts->pcr_pid &&
1384
parse_pcr(×tamp, &pcr_l, buf) == 0) {
1387
pos += ts->raw_packet_size;
1391
pos -= ts->raw_packet_size;
1393
return AV_NOPTS_VALUE;
1394
url_fseek(&s->pb, pos, SEEK_SET);
1395
if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1396
return AV_NOPTS_VALUE;
1397
pid = ((buf[1] & 0x1f) << 8) | buf[2];
1398
if (pid == ts->pcr_pid &&
1399
parse_pcr(×tamp, &pcr_l, buf) == 0) {
1409
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1410
MpegTSContext *ts = s->priv_data;
1411
uint8_t buf[TS_PACKET_SIZE];
1414
if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1417
pos= url_ftell(&s->pb);
1420
url_fseek(&s->pb, pos, SEEK_SET);
1421
if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1423
// pid = ((buf[1] & 0x1f) << 8) | buf[2];
1424
if(buf[1] & 0x40) break;
1425
pos += ts->raw_packet_size;
1427
url_fseek(&s->pb, pos, SEEK_SET);
1432
/**************************************************************/
1433
/* parsing functions - called from other demuxers such as RTP */
1435
MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1439
ts = av_mallocz(sizeof(MpegTSContext));
1442
/* no stream case, currently used by RTP */
1443
ts->raw_packet_size = TS_PACKET_SIZE;
1449
/* return the consumed length if a packet was output, or -1 if no
1451
int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1452
const uint8_t *buf, int len)
1462
if (len < TS_PACKET_SIZE)
1464
if (buf[0] != 0x47) {
1468
handle_packet(ts, buf);
1469
buf += TS_PACKET_SIZE;
1470
len -= TS_PACKET_SIZE;
1476
void mpegts_parse_close(MpegTSContext *ts)
1480
for(i=0;i<NB_PID_MAX;i++)
1481
av_free(ts->pids[i]);
1485
AVInputFormat mpegts_demux = {
1487
"MPEG2 transport stream format",
1488
sizeof(MpegTSContext),
1495
.flags = AVFMT_SHOW_IDS,
1498
int mpegts_init(void)
1500
av_register_input_format(&mpegts_demux);
1501
#ifdef CONFIG_MUXERS
1502
av_register_output_format(&mpegts_mux);