Statistics
| Branch: | Revision:

ffmpeg / libavformat / mpegts.c @ 90f5e991

History | View | Annotate | Download (58.1 KB)

1
/*
2
 * MPEG2 transport stream (aka DVB) demuxer
3
 * Copyright (c) 2002-2003 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
6
 *
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.
11
 *
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.
16
 *
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
20
 */
21

    
22
//#define DEBUG
23
//#define DEBUG_SEEK
24
//#define USE_SYNCPOINT_SEARCH
25

    
26
#include "libavutil/crc.h"
27
#include "libavutil/intreadwrite.h"
28
#include "libavcodec/bytestream.h"
29
#include "avformat.h"
30
#include "mpegts.h"
31
#include "internal.h"
32
#include "avio_internal.h"
33
#include "seek.h"
34
#include "mpeg.h"
35
#include "isom.h"
36

    
37
/* maximum size in which we look for synchronisation if
38
   synchronisation is lost */
39
#define MAX_RESYNC_SIZE 65536
40

    
41
#define MAX_PES_PAYLOAD 200*1024
42

    
43
enum MpegTSFilterType {
44
    MPEGTS_PES,
45
    MPEGTS_SECTION,
46
};
47

    
48
typedef struct MpegTSFilter MpegTSFilter;
49

    
50
typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
51

    
52
typedef struct MpegTSPESFilter {
53
    PESCallback *pes_cb;
54
    void *opaque;
55
} MpegTSPESFilter;
56

    
57
typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
58

    
59
typedef void SetServiceCallback(void *opaque, int ret);
60

    
61
typedef struct MpegTSSectionFilter {
62
    int section_index;
63
    int section_h_size;
64
    uint8_t *section_buf;
65
    unsigned int check_crc:1;
66
    unsigned int end_of_section_reached:1;
67
    SectionCallback *section_cb;
68
    void *opaque;
69
} MpegTSSectionFilter;
70

    
71
struct MpegTSFilter {
72
    int pid;
73
    int last_cc; /* last cc code (-1 if first packet) */
74
    enum MpegTSFilterType type;
75
    union {
76
        MpegTSPESFilter pes_filter;
77
        MpegTSSectionFilter section_filter;
78
    } u;
79
};
80

    
81
#define MAX_PIDS_PER_PROGRAM 64
82
struct Program {
83
    unsigned int id; //program id/service id
84
    unsigned int nb_pids;
85
    unsigned int pids[MAX_PIDS_PER_PROGRAM];
86
};
87

    
88
struct MpegTSContext {
89
    /* user data */
90
    AVFormatContext *stream;
91
    /** raw packet size, including FEC if present            */
92
    int raw_packet_size;
93

    
94
    int pos47;
95

    
96
    /** if true, all pids are analyzed to find streams       */
97
    int auto_guess;
98

    
99
    /** compute exact PCR for each transport stream packet   */
100
    int mpeg2ts_compute_pcr;
101

    
102
    int64_t cur_pcr;    /**< used to estimate the exact PCR  */
103
    int pcr_incr;       /**< used to estimate the exact PCR  */
104

    
105
    /* data needed to handle file based ts */
106
    /** stop parsing loop                                    */
107
    int stop_parse;
108
    /** packet containing Audio/Video data                   */
109
    AVPacket *pkt;
110
    /** to detect seek                                       */
111
    int64_t last_pos;
112

    
113
    /******************************************/
114
    /* private mpegts data */
115
    /* scan context */
116
    /** structure to keep track of Program->pids mapping     */
117
    unsigned int nb_prg;
118
    struct Program *prg;
119

    
120

    
121
    /** filters for various streams specified by PMT + for the PAT and PMT */
122
    MpegTSFilter *pids[NB_PID_MAX];
123
};
124

    
125
/* TS stream handling */
126

    
127
enum MpegTSState {
128
    MPEGTS_HEADER = 0,
129
    MPEGTS_PESHEADER,
130
    MPEGTS_PESHEADER_FILL,
131
    MPEGTS_PAYLOAD,
132
    MPEGTS_SKIP,
133
};
134

    
135
/* enough for PES header + length */
136
#define PES_START_SIZE  6
137
#define PES_HEADER_SIZE 9
138
#define MAX_PES_HEADER_SIZE (9 + 255)
139

    
140
typedef struct PESContext {
141
    int pid;
142
    int pcr_pid; /**< if -1 then all packets containing PCR are considered */
143
    int stream_type;
144
    MpegTSContext *ts;
145
    AVFormatContext *stream;
146
    AVStream *st;
147
    AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
148
    enum MpegTSState state;
149
    /* used to get the format */
150
    int data_index;
151
    int total_size;
152
    int pes_header_size;
153
    int extended_stream_id;
154
    int64_t pts, dts;
155
    int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
156
    uint8_t header[MAX_PES_HEADER_SIZE];
157
    uint8_t *buffer;
158
} PESContext;
159

    
160
extern AVInputFormat ff_mpegts_demuxer;
161

    
162
static void clear_program(MpegTSContext *ts, unsigned int programid)
163
{
164
    int i;
165

    
166
    for(i=0; i<ts->nb_prg; i++)
167
        if(ts->prg[i].id == programid)
168
            ts->prg[i].nb_pids = 0;
169
}
170

    
171
static void clear_programs(MpegTSContext *ts)
172
{
173
    av_freep(&ts->prg);
174
    ts->nb_prg=0;
175
}
176

    
177
static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
178
{
179
    struct Program *p;
180
    void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
181
    if(!tmp)
182
        return;
183
    ts->prg = tmp;
184
    p = &ts->prg[ts->nb_prg];
185
    p->id = programid;
186
    p->nb_pids = 0;
187
    ts->nb_prg++;
188
}
189

    
190
static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
191
{
192
    int i;
193
    struct Program *p = NULL;
194
    for(i=0; i<ts->nb_prg; i++) {
195
        if(ts->prg[i].id == programid) {
196
            p = &ts->prg[i];
197
            break;
198
        }
199
    }
200
    if(!p)
201
        return;
202

    
203
    if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
204
        return;
205
    p->pids[p->nb_pids++] = pid;
206
}
207

    
208
/**
209
 * \brief discard_pid() decides if the pid is to be discarded according
210
 *                      to caller's programs selection
211
 * \param ts    : - TS context
212
 * \param pid   : - pid
213
 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
214
 *         0 otherwise
215
 */
216
static int discard_pid(MpegTSContext *ts, unsigned int pid)
217
{
218
    int i, j, k;
219
    int used = 0, discarded = 0;
220
    struct Program *p;
221
    for(i=0; i<ts->nb_prg; i++) {
222
        p = &ts->prg[i];
223
        for(j=0; j<p->nb_pids; j++) {
224
            if(p->pids[j] != pid)
225
                continue;
226
            //is program with id p->id set to be discarded?
227
            for(k=0; k<ts->stream->nb_programs; k++) {
228
                if(ts->stream->programs[k]->id == p->id) {
229
                    if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
230
                        discarded++;
231
                    else
232
                        used++;
233
                }
234
            }
235
        }
236
    }
237

    
238
    return !used && discarded;
239
}
240

    
241
/**
242
 *  Assemble PES packets out of TS packets, and then call the "section_cb"
243
 *  function when they are complete.
244
 */
245
static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
246
                               const uint8_t *buf, int buf_size, int is_start)
247
{
248
    MpegTSSectionFilter *tss = &tss1->u.section_filter;
249
    int len;
250

    
251
    if (is_start) {
252
        memcpy(tss->section_buf, buf, buf_size);
253
        tss->section_index = buf_size;
254
        tss->section_h_size = -1;
255
        tss->end_of_section_reached = 0;
256
    } else {
257
        if (tss->end_of_section_reached)
258
            return;
259
        len = 4096 - tss->section_index;
260
        if (buf_size < len)
261
            len = buf_size;
262
        memcpy(tss->section_buf + tss->section_index, buf, len);
263
        tss->section_index += len;
264
    }
265

    
266
    /* compute section length if possible */
267
    if (tss->section_h_size == -1 && tss->section_index >= 3) {
268
        len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
269
        if (len > 4096)
270
            return;
271
        tss->section_h_size = len;
272
    }
273

    
274
    if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
275
        tss->end_of_section_reached = 1;
276
        if (!tss->check_crc ||
277
            av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
278
                   tss->section_buf, tss->section_h_size) == 0)
279
            tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
280
    }
281
}
282

    
283
static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
284
                                         SectionCallback *section_cb, void *opaque,
285
                                         int check_crc)
286

    
287
{
288
    MpegTSFilter *filter;
289
    MpegTSSectionFilter *sec;
290

    
291
    av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
292

    
293
    if (pid >= NB_PID_MAX || ts->pids[pid])
294
        return NULL;
295
    filter = av_mallocz(sizeof(MpegTSFilter));
296
    if (!filter)
297
        return NULL;
298
    ts->pids[pid] = filter;
299
    filter->type = MPEGTS_SECTION;
300
    filter->pid = pid;
301
    filter->last_cc = -1;
302
    sec = &filter->u.section_filter;
303
    sec->section_cb = section_cb;
304
    sec->opaque = opaque;
305
    sec->section_buf = av_malloc(MAX_SECTION_SIZE);
306
    sec->check_crc = check_crc;
307
    if (!sec->section_buf) {
308
        av_free(filter);
309
        return NULL;
310
    }
311
    return filter;
312
}
313

    
314
static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
315
                                     PESCallback *pes_cb,
316
                                     void *opaque)
317
{
318
    MpegTSFilter *filter;
319
    MpegTSPESFilter *pes;
320

    
321
    if (pid >= NB_PID_MAX || ts->pids[pid])
322
        return NULL;
323
    filter = av_mallocz(sizeof(MpegTSFilter));
324
    if (!filter)
325
        return NULL;
326
    ts->pids[pid] = filter;
327
    filter->type = MPEGTS_PES;
328
    filter->pid = pid;
329
    filter->last_cc = -1;
330
    pes = &filter->u.pes_filter;
331
    pes->pes_cb = pes_cb;
332
    pes->opaque = opaque;
333
    return filter;
334
}
335

    
336
static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
337
{
338
    int pid;
339

    
340
    pid = filter->pid;
341
    if (filter->type == MPEGTS_SECTION)
342
        av_freep(&filter->u.section_filter.section_buf);
343
    else if (filter->type == MPEGTS_PES) {
344
        PESContext *pes = filter->u.pes_filter.opaque;
345
        av_freep(&pes->buffer);
346
        /* referenced private data will be freed later in
347
         * av_close_input_stream */
348
        if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
349
            av_freep(&filter->u.pes_filter.opaque);
350
        }
351
    }
352

    
353
    av_free(filter);
354
    ts->pids[pid] = NULL;
355
}
356

    
357
static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
358
    int stat[TS_MAX_PACKET_SIZE];
359
    int i;
360
    int x=0;
361
    int best_score=0;
362

    
363
    memset(stat, 0, packet_size*sizeof(int));
364

    
365
    for(x=i=0; i<size-3; i++){
366
        if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
367
            stat[x]++;
368
            if(stat[x] > best_score){
369
                best_score= stat[x];
370
                if(index) *index= x;
371
            }
372
        }
373

    
374
        x++;
375
        if(x == packet_size) x= 0;
376
    }
377

    
378
    return best_score;
379
}
380

    
381
/* autodetect fec presence. Must have at least 1024 bytes  */
382
static int get_packet_size(const uint8_t *buf, int size)
383
{
384
    int score, fec_score, dvhs_score;
385

    
386
    if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
387
        return -1;
388

    
389
    score    = analyze(buf, size, TS_PACKET_SIZE, NULL);
390
    dvhs_score    = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
391
    fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
392
//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
393

    
394
    if     (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
395
    else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
396
    else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
397
    else                       return -1;
398
}
399

    
400
typedef struct SectionHeader {
401
    uint8_t tid;
402
    uint16_t id;
403
    uint8_t version;
404
    uint8_t sec_num;
405
    uint8_t last_sec_num;
406
} SectionHeader;
407

    
408
static inline int get8(const uint8_t **pp, const uint8_t *p_end)
409
{
410
    const uint8_t *p;
411
    int c;
412

    
413
    p = *pp;
414
    if (p >= p_end)
415
        return -1;
416
    c = *p++;
417
    *pp = p;
418
    return c;
419
}
420

    
421
static inline int get16(const uint8_t **pp, const uint8_t *p_end)
422
{
423
    const uint8_t *p;
424
    int c;
425

    
426
    p = *pp;
427
    if ((p + 1) >= p_end)
428
        return -1;
429
    c = AV_RB16(p);
430
    p += 2;
431
    *pp = p;
432
    return c;
433
}
434

    
435
/* read and allocate a DVB string preceeded by its length */
436
static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
437
{
438
    int len;
439
    const uint8_t *p;
440
    char *str;
441

    
442
    p = *pp;
443
    len = get8(&p, p_end);
444
    if (len < 0)
445
        return NULL;
446
    if ((p + len) > p_end)
447
        return NULL;
448
    str = av_malloc(len + 1);
449
    if (!str)
450
        return NULL;
451
    memcpy(str, p, len);
452
    str[len] = '\0';
453
    p += len;
454
    *pp = p;
455
    return str;
456
}
457

    
458
static int parse_section_header(SectionHeader *h,
459
                                const uint8_t **pp, const uint8_t *p_end)
460
{
461
    int val;
462

    
463
    val = get8(pp, p_end);
464
    if (val < 0)
465
        return -1;
466
    h->tid = val;
467
    *pp += 2;
468
    val = get16(pp, p_end);
469
    if (val < 0)
470
        return -1;
471
    h->id = val;
472
    val = get8(pp, p_end);
473
    if (val < 0)
474
        return -1;
475
    h->version = (val >> 1) & 0x1f;
476
    val = get8(pp, p_end);
477
    if (val < 0)
478
        return -1;
479
    h->sec_num = val;
480
    val = get8(pp, p_end);
481
    if (val < 0)
482
        return -1;
483
    h->last_sec_num = val;
484
    return 0;
485
}
486

    
487
typedef struct {
488
    uint32_t stream_type;
489
    enum AVMediaType codec_type;
490
    enum CodecID codec_id;
491
} StreamType;
492

    
493
static const StreamType ISO_types[] = {
494
    { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
495
    { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
496
    { 0x03, AVMEDIA_TYPE_AUDIO,        CODEC_ID_MP3 },
497
    { 0x04, AVMEDIA_TYPE_AUDIO,        CODEC_ID_MP3 },
498
    { 0x0f, AVMEDIA_TYPE_AUDIO,        CODEC_ID_AAC },
499
    { 0x10, AVMEDIA_TYPE_VIDEO,      CODEC_ID_MPEG4 },
500
    { 0x11, AVMEDIA_TYPE_AUDIO,   CODEC_ID_AAC_LATM }, /* LATM syntax */
501
    { 0x1b, AVMEDIA_TYPE_VIDEO,       CODEC_ID_H264 },
502
    { 0xd1, AVMEDIA_TYPE_VIDEO,      CODEC_ID_DIRAC },
503
    { 0xea, AVMEDIA_TYPE_VIDEO,        CODEC_ID_VC1 },
504
    { 0 },
505
};
506

    
507
static const StreamType HDMV_types[] = {
508
    { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
509
    { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
510
    { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
511
    { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
512
    { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
513
    { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
514
    { 0 },
515
};
516

    
517
/* ATSC ? */
518
static const StreamType MISC_types[] = {
519
    { 0x81, AVMEDIA_TYPE_AUDIO,   CODEC_ID_AC3 },
520
    { 0x8a, AVMEDIA_TYPE_AUDIO,   CODEC_ID_DTS },
521
    { 0 },
522
};
523

    
524
static const StreamType REGD_types[] = {
525
    { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
526
    { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO,   CODEC_ID_AC3 },
527
    { 0 },
528
};
529

    
530
/* descriptor present */
531
static const StreamType DESC_types[] = {
532
    { 0x6a, AVMEDIA_TYPE_AUDIO,             CODEC_ID_AC3 }, /* AC-3 descriptor */
533
    { 0x7a, AVMEDIA_TYPE_AUDIO,            CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
534
    { 0x7b, AVMEDIA_TYPE_AUDIO,             CODEC_ID_DTS },
535
    { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
536
    { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
537
    { 0 },
538
};
539

    
540
static void mpegts_find_stream_type(AVStream *st,
541
                                    uint32_t stream_type, const StreamType *types)
542
{
543
    for (; types->stream_type; types++) {
544
        if (stream_type == types->stream_type) {
545
            st->codec->codec_type = types->codec_type;
546
            st->codec->codec_id   = types->codec_id;
547
            st->request_probe     = 0;
548
            return;
549
        }
550
    }
551
}
552

    
553
static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
554
                                  uint32_t stream_type, uint32_t prog_reg_desc)
555
{
556
    av_set_pts_info(st, 33, 1, 90000);
557
    st->priv_data = pes;
558
    st->codec->codec_type = AVMEDIA_TYPE_DATA;
559
    st->codec->codec_id   = CODEC_ID_NONE;
560
    st->need_parsing = AVSTREAM_PARSE_FULL;
561
    pes->st = st;
562
    pes->stream_type = stream_type;
563

    
564
    av_log(pes->stream, AV_LOG_DEBUG,
565
           "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
566
           st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
567

    
568
    st->codec->codec_tag = pes->stream_type;
569

    
570
    mpegts_find_stream_type(st, pes->stream_type, ISO_types);
571
    if (prog_reg_desc == AV_RL32("HDMV") &&
572
        st->codec->codec_id == CODEC_ID_NONE) {
573
        mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
574
        if (pes->stream_type == 0x83) {
575
            // HDMV TrueHD streams also contain an AC3 coded version of the
576
            // audio track - add a second stream for this
577
            AVStream *sub_st;
578
            // priv_data cannot be shared between streams
579
            PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
580
            if (!sub_pes)
581
                return AVERROR(ENOMEM);
582
            memcpy(sub_pes, pes, sizeof(*sub_pes));
583

    
584
            sub_st = av_new_stream(pes->stream, pes->pid);
585
            if (!sub_st) {
586
                av_free(sub_pes);
587
                return AVERROR(ENOMEM);
588
            }
589

    
590
            av_set_pts_info(sub_st, 33, 1, 90000);
591
            sub_st->priv_data = sub_pes;
592
            sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
593
            sub_st->codec->codec_id   = CODEC_ID_AC3;
594
            sub_st->need_parsing = AVSTREAM_PARSE_FULL;
595
            sub_pes->sub_st = pes->sub_st = sub_st;
596
        }
597
    }
598
    if (st->codec->codec_id == CODEC_ID_NONE)
599
        mpegts_find_stream_type(st, pes->stream_type, MISC_types);
600

    
601
    return 0;
602
}
603

    
604
static void new_pes_packet(PESContext *pes, AVPacket *pkt)
605
{
606
    av_init_packet(pkt);
607

    
608
    pkt->destruct = av_destruct_packet;
609
    pkt->data = pes->buffer;
610
    pkt->size = pes->data_index;
611
    memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
612

    
613
    // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
614
    if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
615
        pkt->stream_index = pes->sub_st->index;
616
    else
617
        pkt->stream_index = pes->st->index;
618
    pkt->pts = pes->pts;
619
    pkt->dts = pes->dts;
620
    /* store position of first TS packet of this PES packet */
621
    pkt->pos = pes->ts_packet_pos;
622

    
623
    /* reset pts values */
624
    pes->pts = AV_NOPTS_VALUE;
625
    pes->dts = AV_NOPTS_VALUE;
626
    pes->buffer = NULL;
627
    pes->data_index = 0;
628
}
629

    
630
/* return non zero if a packet could be constructed */
631
static int mpegts_push_data(MpegTSFilter *filter,
632
                            const uint8_t *buf, int buf_size, int is_start,
633
                            int64_t pos)
634
{
635
    PESContext *pes = filter->u.pes_filter.opaque;
636
    MpegTSContext *ts = pes->ts;
637
    const uint8_t *p;
638
    int len, code;
639

    
640
    if(!ts->pkt)
641
        return 0;
642

    
643
    if (is_start) {
644
        if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
645
            new_pes_packet(pes, ts->pkt);
646
            ts->stop_parse = 1;
647
        }
648
        pes->state = MPEGTS_HEADER;
649
        pes->data_index = 0;
650
        pes->ts_packet_pos = pos;
651
    }
652
    p = buf;
653
    while (buf_size > 0) {
654
        switch(pes->state) {
655
        case MPEGTS_HEADER:
656
            len = PES_START_SIZE - pes->data_index;
657
            if (len > buf_size)
658
                len = buf_size;
659
            memcpy(pes->header + pes->data_index, p, len);
660
            pes->data_index += len;
661
            p += len;
662
            buf_size -= len;
663
            if (pes->data_index == PES_START_SIZE) {
664
                /* we got all the PES or section header. We can now
665
                   decide */
666
                if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
667
                    pes->header[2] == 0x01) {
668
                    /* it must be an mpeg2 PES stream */
669
                    code = pes->header[3] | 0x100;
670
                    av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
671

    
672
                    if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
673
                        code == 0x1be) /* padding_stream */
674
                        goto skip;
675

    
676
                    /* stream not present in PMT */
677
                    if (!pes->st) {
678
                        pes->st = av_new_stream(ts->stream, pes->pid);
679
                        if (!pes->st)
680
                            return AVERROR(ENOMEM);
681
                        mpegts_set_stream_info(pes->st, pes, 0, 0);
682
                    }
683

    
684
                    pes->total_size = AV_RB16(pes->header + 4);
685
                    /* NOTE: a zero total size means the PES size is
686
                       unbounded */
687
                    if (!pes->total_size)
688
                        pes->total_size = MAX_PES_PAYLOAD;
689

    
690
                    /* allocate pes buffer */
691
                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
692
                    if (!pes->buffer)
693
                        return AVERROR(ENOMEM);
694

    
695
                    if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
696
                        code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
697
                        code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
698
                        code != 0x1f8) {                  /* ITU-T Rec. H.222.1 type E stream */
699
                        pes->state = MPEGTS_PESHEADER;
700
                        if (pes->st->codec->codec_id == CODEC_ID_NONE && !pes->st->request_probe) {
701
                            av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
702
                                    pes->pid, pes->stream_type);
703
                            pes->st->request_probe= 1;
704
                        }
705
                    } else {
706
                        pes->state = MPEGTS_PAYLOAD;
707
                        pes->data_index = 0;
708
                    }
709
                } else {
710
                    /* otherwise, it should be a table */
711
                    /* skip packet */
712
                skip:
713
                    pes->state = MPEGTS_SKIP;
714
                    continue;
715
                }
716
            }
717
            break;
718
            /**********************************************/
719
            /* PES packing parsing */
720
        case MPEGTS_PESHEADER:
721
            len = PES_HEADER_SIZE - pes->data_index;
722
            if (len < 0)
723
                return -1;
724
            if (len > buf_size)
725
                len = buf_size;
726
            memcpy(pes->header + pes->data_index, p, len);
727
            pes->data_index += len;
728
            p += len;
729
            buf_size -= len;
730
            if (pes->data_index == PES_HEADER_SIZE) {
731
                pes->pes_header_size = pes->header[8] + 9;
732
                pes->state = MPEGTS_PESHEADER_FILL;
733
            }
734
            break;
735
        case MPEGTS_PESHEADER_FILL:
736
            len = pes->pes_header_size - pes->data_index;
737
            if (len < 0)
738
                return -1;
739
            if (len > buf_size)
740
                len = buf_size;
741
            memcpy(pes->header + pes->data_index, p, len);
742
            pes->data_index += len;
743
            p += len;
744
            buf_size -= len;
745
            if (pes->data_index == pes->pes_header_size) {
746
                const uint8_t *r;
747
                unsigned int flags, pes_ext, skip;
748

    
749
                flags = pes->header[7];
750
                r = pes->header + 9;
751
                pes->pts = AV_NOPTS_VALUE;
752
                pes->dts = AV_NOPTS_VALUE;
753
                if ((flags & 0xc0) == 0x80) {
754
                    pes->dts = pes->pts = ff_parse_pes_pts(r);
755
                    r += 5;
756
                } else if ((flags & 0xc0) == 0xc0) {
757
                    pes->pts = ff_parse_pes_pts(r);
758
                    r += 5;
759
                    pes->dts = ff_parse_pes_pts(r);
760
                    r += 5;
761
                }
762
                pes->extended_stream_id = -1;
763
                if (flags & 0x01) { /* PES extension */
764
                    pes_ext = *r++;
765
                    /* Skip PES private data, program packet sequence counter and P-STD buffer */
766
                    skip = (pes_ext >> 4) & 0xb;
767
                    skip += skip & 0x9;
768
                    r += skip;
769
                    if ((pes_ext & 0x41) == 0x01 &&
770
                        (r + 2) <= (pes->header + pes->pes_header_size)) {
771
                        /* PES extension 2 */
772
                        if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
773
                            pes->extended_stream_id = r[1];
774
                    }
775
                }
776

    
777
                /* we got the full header. We parse it and get the payload */
778
                pes->state = MPEGTS_PAYLOAD;
779
                pes->data_index = 0;
780
            }
781
            break;
782
        case MPEGTS_PAYLOAD:
783
            if (buf_size > 0 && pes->buffer) {
784
                if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
785
                    new_pes_packet(pes, ts->pkt);
786
                    pes->total_size = MAX_PES_PAYLOAD;
787
                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
788
                    if (!pes->buffer)
789
                        return AVERROR(ENOMEM);
790
                    ts->stop_parse = 1;
791
                } else if (pes->data_index == 0 && buf_size > pes->total_size) {
792
                    // pes packet size is < ts size packet and pes data is padded with 0xff
793
                    // not sure if this is legal in ts but see issue #2392
794
                    buf_size = pes->total_size;
795
                }
796
                memcpy(pes->buffer+pes->data_index, p, buf_size);
797
                pes->data_index += buf_size;
798
            }
799
            buf_size = 0;
800
            /* emit complete packets with known packet size
801
             * decreases demuxer delay for infrequent packets like subtitles from
802
             * a couple of seconds to milliseconds for properly muxed files.
803
             * total_size is the number of bytes following pes_packet_length
804
             * in the pes header, i.e. not counting the first 6 bytes */
805
            if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
806
                pes->pes_header_size + pes->data_index == pes->total_size + 6) {
807
                ts->stop_parse = 1;
808
                new_pes_packet(pes, ts->pkt);
809
            }
810
            break;
811
        case MPEGTS_SKIP:
812
            buf_size = 0;
813
            break;
814
        }
815
    }
816

    
817
    return 0;
818
}
819

    
820
static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
821
{
822
    MpegTSFilter *tss;
823
    PESContext *pes;
824

    
825
    /* if no pid found, then add a pid context */
826
    pes = av_mallocz(sizeof(PESContext));
827
    if (!pes)
828
        return 0;
829
    pes->ts = ts;
830
    pes->stream = ts->stream;
831
    pes->pid = pid;
832
    pes->pcr_pid = pcr_pid;
833
    pes->state = MPEGTS_SKIP;
834
    pes->pts = AV_NOPTS_VALUE;
835
    pes->dts = AV_NOPTS_VALUE;
836
    tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
837
    if (!tss) {
838
        av_free(pes);
839
        return 0;
840
    }
841
    return pes;
842
}
843

    
844
static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
845
                         int *es_id, uint8_t **dec_config_descr,
846
                         int *dec_config_descr_size)
847
{
848
    AVIOContext pb;
849
    int tag;
850
    unsigned len;
851

    
852
    ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
853

    
854
    len = ff_mp4_read_descr(s, &pb, &tag);
855
    if (tag == MP4IODescrTag) {
856
        avio_rb16(&pb); // ID
857
        avio_r8(&pb);
858
        avio_r8(&pb);
859
        avio_r8(&pb);
860
        avio_r8(&pb);
861
        avio_r8(&pb);
862
        len = ff_mp4_read_descr(s, &pb, &tag);
863
        if (tag == MP4ESDescrTag) {
864
            *es_id = avio_rb16(&pb); /* ES_ID */
865
            av_dlog(s, "ES_ID %#x\n", *es_id);
866
            avio_r8(&pb); /* priority */
867
            len = ff_mp4_read_descr(s, &pb, &tag);
868
            if (tag == MP4DecConfigDescrTag) {
869
                *dec_config_descr = av_malloc(len);
870
                if (!*dec_config_descr)
871
                    return AVERROR(ENOMEM);
872
                *dec_config_descr_size = len;
873
                avio_read(&pb, *dec_config_descr, len);
874
            }
875
        }
876
    }
877
    return 0;
878
}
879

    
880
int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
881
                              const uint8_t **pp, const uint8_t *desc_list_end,
882
                              int mp4_dec_config_descr_len, int mp4_es_id, int pid,
883
                              uint8_t *mp4_dec_config_descr)
884
{
885
    const uint8_t *desc_end;
886
    int desc_len, desc_tag;
887
    char language[252];
888
    int i;
889

    
890
    desc_tag = get8(pp, desc_list_end);
891
    if (desc_tag < 0)
892
        return -1;
893
    desc_len = get8(pp, desc_list_end);
894
    if (desc_len < 0)
895
        return -1;
896
    desc_end = *pp + desc_len;
897
    if (desc_end > desc_list_end)
898
        return -1;
899

    
900
    av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
901

    
902
    if (st->codec->codec_id == CODEC_ID_NONE &&
903
        stream_type == STREAM_TYPE_PRIVATE_DATA)
904
        mpegts_find_stream_type(st, desc_tag, DESC_types);
905

    
906
    switch(desc_tag) {
907
    case 0x1F: /* FMC descriptor */
908
        get16(pp, desc_end);
909
        if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
910
            mp4_dec_config_descr_len && mp4_es_id == pid) {
911
            AVIOContext pb;
912
            ffio_init_context(&pb, mp4_dec_config_descr,
913
                          mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
914
            ff_mp4_read_dec_config_descr(fc, st, &pb);
915
            if (st->codec->codec_id == CODEC_ID_AAC &&
916
                st->codec->extradata_size > 0)
917
                st->need_parsing = 0;
918
        }
919
        break;
920
    case 0x56: /* DVB teletext descriptor */
921
        language[0] = get8(pp, desc_end);
922
        language[1] = get8(pp, desc_end);
923
        language[2] = get8(pp, desc_end);
924
        language[3] = 0;
925
        av_metadata_set2(&st->metadata, "language", language, 0);
926
        break;
927
    case 0x59: /* subtitling descriptor */
928
        language[0] = get8(pp, desc_end);
929
        language[1] = get8(pp, desc_end);
930
        language[2] = get8(pp, desc_end);
931
        language[3] = 0;
932
        /* hearing impaired subtitles detection */
933
        switch(get8(pp, desc_end)) {
934
        case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
935
        case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
936
        case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
937
        case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
938
        case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
939
        case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
940
            st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
941
            break;
942
        }
943
        if (st->codec->extradata) {
944
            if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
945
                av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
946
        } else {
947
            st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
948
            if (st->codec->extradata) {
949
                st->codec->extradata_size = 4;
950
                memcpy(st->codec->extradata, *pp, 4);
951
            }
952
        }
953
        *pp += 4;
954
        av_metadata_set2(&st->metadata, "language", language, 0);
955
        break;
956
    case 0x0a: /* ISO 639 language descriptor */
957
        for (i = 0; i + 4 <= desc_len; i += 4) {
958
            language[i + 0] = get8(pp, desc_end);
959
            language[i + 1] = get8(pp, desc_end);
960
            language[i + 2] = get8(pp, desc_end);
961
            language[i + 3] = ',';
962
        switch (get8(pp, desc_end)) {
963
            case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
964
            case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
965
            case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
966
        }
967
        }
968
        if (i) {
969
            language[i - 1] = 0;
970
            av_metadata_set2(&st->metadata, "language", language, 0);
971
        }
972
        break;
973
    case 0x05: /* registration descriptor */
974
        st->codec->codec_tag = bytestream_get_le32(pp);
975
        av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
976
        if (st->codec->codec_id == CODEC_ID_NONE &&
977
            stream_type == STREAM_TYPE_PRIVATE_DATA)
978
            mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
979
        break;
980
    default:
981
        break;
982
    }
983
    *pp = desc_end;
984
    return 0;
985
}
986

    
987
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
988
{
989
    MpegTSContext *ts = filter->u.section_filter.opaque;
990
    SectionHeader h1, *h = &h1;
991
    PESContext *pes;
992
    AVStream *st;
993
    const uint8_t *p, *p_end, *desc_list_end;
994
    int program_info_length, pcr_pid, pid, stream_type;
995
    int desc_list_len;
996
    uint32_t prog_reg_desc = 0; /* registration descriptor */
997
    uint8_t *mp4_dec_config_descr = NULL;
998
    int mp4_dec_config_descr_len = 0;
999
    int mp4_es_id = 0;
1000

    
1001
#ifdef DEBUG
1002
    av_dlog(ts->stream, "PMT: len %i\n", section_len);
1003
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1004
#endif
1005

    
1006
    p_end = section + section_len - 4;
1007
    p = section;
1008
    if (parse_section_header(h, &p, p_end) < 0)
1009
        return;
1010

    
1011
    av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1012
           h->id, h->sec_num, h->last_sec_num);
1013

    
1014
    if (h->tid != PMT_TID)
1015
        return;
1016

    
1017
    clear_program(ts, h->id);
1018
    pcr_pid = get16(&p, p_end) & 0x1fff;
1019
    if (pcr_pid < 0)
1020
        return;
1021
    add_pid_to_pmt(ts, h->id, pcr_pid);
1022

    
1023
    av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1024

    
1025
    program_info_length = get16(&p, p_end) & 0xfff;
1026
    if (program_info_length < 0)
1027
        return;
1028
    while(program_info_length >= 2) {
1029
        uint8_t tag, len;
1030
        tag = get8(&p, p_end);
1031
        len = get8(&p, p_end);
1032

    
1033
        av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1034

    
1035
        if(len > program_info_length - 2)
1036
            //something else is broken, exit the program_descriptors_loop
1037
            break;
1038
        program_info_length -= len + 2;
1039
        if (tag == 0x1d) { // IOD descriptor
1040
            get8(&p, p_end); // scope
1041
            get8(&p, p_end); // label
1042
            len -= 2;
1043
            mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1044
                          &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1045
        } else if (tag == 0x05 && len >= 4) { // registration descriptor
1046
            prog_reg_desc = bytestream_get_le32(&p);
1047
            len -= 4;
1048
        }
1049
        p += len;
1050
    }
1051
    p += program_info_length;
1052
    if (p >= p_end)
1053
        goto out;
1054

    
1055
    // stop parsing after pmt, we found header
1056
    if (!ts->stream->nb_streams)
1057
        ts->stop_parse = 1;
1058

    
1059
    for(;;) {
1060
        st = 0;
1061
        stream_type = get8(&p, p_end);
1062
        if (stream_type < 0)
1063
            break;
1064
        pid = get16(&p, p_end) & 0x1fff;
1065
        if (pid < 0)
1066
            break;
1067

    
1068
        /* now create ffmpeg stream */
1069
        if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1070
            pes = ts->pids[pid]->u.pes_filter.opaque;
1071
            if (!pes->st)
1072
                pes->st = av_new_stream(pes->stream, pes->pid);
1073
            st = pes->st;
1074
        } else {
1075
            if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1076
            pes = add_pes_stream(ts, pid, pcr_pid);
1077
            if (pes)
1078
                st = av_new_stream(pes->stream, pes->pid);
1079
        }
1080

    
1081
        if (!st)
1082
            goto out;
1083

    
1084
        if (!pes->stream_type)
1085
            mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1086

    
1087
        add_pid_to_pmt(ts, h->id, pid);
1088

    
1089
        ff_program_add_stream_index(ts->stream, h->id, st->index);
1090

    
1091
        desc_list_len = get16(&p, p_end) & 0xfff;
1092
        if (desc_list_len < 0)
1093
            break;
1094
        desc_list_end = p + desc_list_len;
1095
        if (desc_list_end > p_end)
1096
            break;
1097
        for(;;) {
1098
            if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1099
                mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1100
                break;
1101

    
1102
            if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1103
                ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1104
                pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1105
            }
1106
        }
1107
        p = desc_list_end;
1108
    }
1109

    
1110
 out:
1111
    av_free(mp4_dec_config_descr);
1112
}
1113

    
1114
static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1115
{
1116
    MpegTSContext *ts = filter->u.section_filter.opaque;
1117
    SectionHeader h1, *h = &h1;
1118
    const uint8_t *p, *p_end;
1119
    int sid, pmt_pid;
1120

    
1121
#ifdef DEBUG
1122
    av_dlog(ts->stream, "PAT:\n");
1123
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1124
#endif
1125
    p_end = section + section_len - 4;
1126
    p = section;
1127
    if (parse_section_header(h, &p, p_end) < 0)
1128
        return;
1129
    if (h->tid != PAT_TID)
1130
        return;
1131

    
1132
    clear_programs(ts);
1133
    for(;;) {
1134
        sid = get16(&p, p_end);
1135
        if (sid < 0)
1136
            break;
1137
        pmt_pid = get16(&p, p_end) & 0x1fff;
1138
        if (pmt_pid < 0)
1139
            break;
1140

    
1141
        av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1142

    
1143
        if (sid == 0x0000) {
1144
            /* NIT info */
1145
        } else {
1146
            av_new_program(ts->stream, sid);
1147
            if (ts->pids[pmt_pid])
1148
                mpegts_close_filter(ts, ts->pids[pmt_pid]);
1149
            mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1150
            add_pat_entry(ts, sid);
1151
            add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1152
            add_pid_to_pmt(ts, sid, pmt_pid);
1153
        }
1154
    }
1155
}
1156

    
1157
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1158
{
1159
    MpegTSContext *ts = filter->u.section_filter.opaque;
1160
    SectionHeader h1, *h = &h1;
1161
    const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1162
    int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1163
    char *name, *provider_name;
1164

    
1165
#ifdef DEBUG
1166
    av_dlog(ts->stream, "SDT:\n");
1167
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1168
#endif
1169

    
1170
    p_end = section + section_len - 4;
1171
    p = section;
1172
    if (parse_section_header(h, &p, p_end) < 0)
1173
        return;
1174
    if (h->tid != SDT_TID)
1175
        return;
1176
    onid = get16(&p, p_end);
1177
    if (onid < 0)
1178
        return;
1179
    val = get8(&p, p_end);
1180
    if (val < 0)
1181
        return;
1182
    for(;;) {
1183
        sid = get16(&p, p_end);
1184
        if (sid < 0)
1185
            break;
1186
        val = get8(&p, p_end);
1187
        if (val < 0)
1188
            break;
1189
        desc_list_len = get16(&p, p_end) & 0xfff;
1190
        if (desc_list_len < 0)
1191
            break;
1192
        desc_list_end = p + desc_list_len;
1193
        if (desc_list_end > p_end)
1194
            break;
1195
        for(;;) {
1196
            desc_tag = get8(&p, desc_list_end);
1197
            if (desc_tag < 0)
1198
                break;
1199
            desc_len = get8(&p, desc_list_end);
1200
            desc_end = p + desc_len;
1201
            if (desc_end > desc_list_end)
1202
                break;
1203

    
1204
            av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1205
                   desc_tag, desc_len);
1206

    
1207
            switch(desc_tag) {
1208
            case 0x48:
1209
                service_type = get8(&p, p_end);
1210
                if (service_type < 0)
1211
                    break;
1212
                provider_name = getstr8(&p, p_end);
1213
                if (!provider_name)
1214
                    break;
1215
                name = getstr8(&p, p_end);
1216
                if (name) {
1217
                    AVProgram *program = av_new_program(ts->stream, sid);
1218
                    if(program) {
1219
                        av_metadata_set2(&program->metadata, "service_name", name, 0);
1220
                        av_metadata_set2(&program->metadata, "service_provider", provider_name, 0);
1221
                    }
1222
                }
1223
                av_free(name);
1224
                av_free(provider_name);
1225
                break;
1226
            default:
1227
                break;
1228
            }
1229
            p = desc_end;
1230
        }
1231
        p = desc_list_end;
1232
    }
1233
}
1234

    
1235
/* handle one TS packet */
1236
static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1237
{
1238
    AVFormatContext *s = ts->stream;
1239
    MpegTSFilter *tss;
1240
    int len, pid, cc, cc_ok, afc, is_start;
1241
    const uint8_t *p, *p_end;
1242
    int64_t pos;
1243

    
1244
    pid = AV_RB16(packet + 1) & 0x1fff;
1245
    if(pid && discard_pid(ts, pid))
1246
        return 0;
1247
    is_start = packet[1] & 0x40;
1248
    tss = ts->pids[pid];
1249
    if (ts->auto_guess && tss == NULL && is_start) {
1250
        add_pes_stream(ts, pid, -1);
1251
        tss = ts->pids[pid];
1252
    }
1253
    if (!tss)
1254
        return 0;
1255

    
1256
    /* continuity check (currently not used) */
1257
    cc = (packet[3] & 0xf);
1258
    cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1259
    tss->last_cc = cc;
1260

    
1261
    /* skip adaptation field */
1262
    afc = (packet[3] >> 4) & 3;
1263
    p = packet + 4;
1264
    if (afc == 0) /* reserved value */
1265
        return 0;
1266
    if (afc == 2) /* adaptation field only */
1267
        return 0;
1268
    if (afc == 3) {
1269
        /* skip adapation field */
1270
        p += p[0] + 1;
1271
    }
1272
    /* if past the end of packet, ignore */
1273
    p_end = packet + TS_PACKET_SIZE;
1274
    if (p >= p_end)
1275
        return 0;
1276

    
1277
    pos = avio_tell(ts->stream->pb);
1278
    ts->pos47= pos % ts->raw_packet_size;
1279

    
1280
    if (tss->type == MPEGTS_SECTION) {
1281
        if (is_start) {
1282
            /* pointer field present */
1283
            len = *p++;
1284
            if (p + len > p_end)
1285
                return 0;
1286
            if (len && cc_ok) {
1287
                /* write remaining section bytes */
1288
                write_section_data(s, tss,
1289
                                   p, len, 0);
1290
                /* check whether filter has been closed */
1291
                if (!ts->pids[pid])
1292
                    return 0;
1293
            }
1294
            p += len;
1295
            if (p < p_end) {
1296
                write_section_data(s, tss,
1297
                                   p, p_end - p, 1);
1298
            }
1299
        } else {
1300
            if (cc_ok) {
1301
                write_section_data(s, tss,
1302
                                   p, p_end - p, 0);
1303
            }
1304
        }
1305
    } else {
1306
        int ret;
1307
        // Note: The position here points actually behind the current packet.
1308
        if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1309
                                            pos - ts->raw_packet_size)) < 0)
1310
            return ret;
1311
    }
1312

    
1313
    return 0;
1314
}
1315

    
1316
/* XXX: try to find a better synchro over several packets (use
1317
   get_packet_size() ?) */
1318
static int mpegts_resync(AVFormatContext *s)
1319
{
1320
    AVIOContext *pb = s->pb;
1321
    int c, i;
1322

    
1323
    for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1324
        c = avio_r8(pb);
1325
        if (url_feof(pb))
1326
            return -1;
1327
        if (c == 0x47) {
1328
            avio_seek(pb, -1, SEEK_CUR);
1329
            return 0;
1330
        }
1331
    }
1332
    av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1333
    /* no sync found */
1334
    return -1;
1335
}
1336

    
1337
/* return -1 if error or EOF. Return 0 if OK. */
1338
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1339
{
1340
    AVIOContext *pb = s->pb;
1341
    int skip, len;
1342

    
1343
    for(;;) {
1344
        len = avio_read(pb, buf, TS_PACKET_SIZE);
1345
        if (len != TS_PACKET_SIZE)
1346
            return len < 0 ? len : AVERROR_EOF;
1347
        /* check paquet sync byte */
1348
        if (buf[0] != 0x47) {
1349
            /* find a new packet start */
1350
            avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1351
            if (mpegts_resync(s) < 0)
1352
                return AVERROR(EAGAIN);
1353
            else
1354
                continue;
1355
        } else {
1356
            skip = raw_packet_size - TS_PACKET_SIZE;
1357
            if (skip > 0)
1358
                avio_skip(pb, skip);
1359
            break;
1360
        }
1361
    }
1362
    return 0;
1363
}
1364

    
1365
static int handle_packets(MpegTSContext *ts, int nb_packets)
1366
{
1367
    AVFormatContext *s = ts->stream;
1368
    uint8_t packet[TS_PACKET_SIZE];
1369
    int packet_num, ret;
1370

    
1371
    ts->stop_parse = 0;
1372
    packet_num = 0;
1373
    for(;;) {
1374
        if (ts->stop_parse>0)
1375
            break;
1376
        packet_num++;
1377
        if (nb_packets != 0 && packet_num >= nb_packets)
1378
            break;
1379
        ret = read_packet(s, packet, ts->raw_packet_size);
1380
        if (ret != 0)
1381
            return ret;
1382
        ret = handle_packet(ts, packet);
1383
        if (ret != 0)
1384
            return ret;
1385
    }
1386
    return 0;
1387
}
1388

    
1389
static int mpegts_probe(AVProbeData *p)
1390
{
1391
#if 1
1392
    const int size= p->buf_size;
1393
    int score, fec_score, dvhs_score;
1394
    int check_count= size / TS_FEC_PACKET_SIZE;
1395
#define CHECK_COUNT 10
1396

    
1397
    if (check_count < CHECK_COUNT)
1398
        return -1;
1399

    
1400
    score     = analyze(p->buf, TS_PACKET_SIZE     *check_count, TS_PACKET_SIZE     , NULL)*CHECK_COUNT/check_count;
1401
    dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1402
    fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1403
//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1404

    
1405
// we need a clear definition for the returned score otherwise things will become messy sooner or later
1406
    if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
1407
    else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
1408
    else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1409
    else                                    return -1;
1410
#else
1411
    /* only use the extension for safer guess */
1412
    if (av_match_ext(p->filename, "ts"))
1413
        return AVPROBE_SCORE_MAX;
1414
    else
1415
        return 0;
1416
#endif
1417
}
1418

    
1419
/* return the 90kHz PCR and the extension for the 27MHz PCR. return
1420
   (-1) if not available */
1421
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1422
                     const uint8_t *packet)
1423
{
1424
    int afc, len, flags;
1425
    const uint8_t *p;
1426
    unsigned int v;
1427

    
1428
    afc = (packet[3] >> 4) & 3;
1429
    if (afc <= 1)
1430
        return -1;
1431
    p = packet + 4;
1432
    len = p[0];
1433
    p++;
1434
    if (len == 0)
1435
        return -1;
1436
    flags = *p++;
1437
    len--;
1438
    if (!(flags & 0x10))
1439
        return -1;
1440
    if (len < 6)
1441
        return -1;
1442
    v = AV_RB32(p);
1443
    *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1444
    *ppcr_low = ((p[4] & 1) << 8) | p[5];
1445
    return 0;
1446
}
1447

    
1448
static int mpegts_read_header(AVFormatContext *s,
1449
                              AVFormatParameters *ap)
1450
{
1451
    MpegTSContext *ts = s->priv_data;
1452
    AVIOContext *pb = s->pb;
1453
    uint8_t buf[5*1024];
1454
    int len;
1455
    int64_t pos;
1456

    
1457
    if (ap) {
1458
        ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1459
        if(ap->mpeg2ts_raw){
1460
            av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1461
            return -1;
1462
        }
1463
    }
1464

    
1465
    /* read the first 1024 bytes to get packet size */
1466
    pos = avio_tell(pb);
1467
    len = avio_read(pb, buf, sizeof(buf));
1468
    if (len != sizeof(buf))
1469
        goto fail;
1470
    ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1471
    if (ts->raw_packet_size <= 0) {
1472
        av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
1473
        ts->raw_packet_size = TS_PACKET_SIZE;
1474
    }
1475
    ts->stream = s;
1476
    ts->auto_guess = 0;
1477

    
1478
    if (s->iformat == &ff_mpegts_demuxer) {
1479
        /* normal demux */
1480

    
1481
        /* first do a scaning to get all the services */
1482
        if (avio_seek(pb, pos, SEEK_SET) < 0)
1483
            av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1484

    
1485
        mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1486

    
1487
        mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1488

    
1489
        handle_packets(ts, s->probesize / ts->raw_packet_size);
1490
        /* if could not find service, enable auto_guess */
1491

    
1492
        ts->auto_guess = 1;
1493

    
1494
        av_dlog(ts->stream, "tuning done\n");
1495

    
1496
        s->ctx_flags |= AVFMTCTX_NOHEADER;
1497
    } else {
1498
        AVStream *st;
1499
        int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1500
        int64_t pcrs[2], pcr_h;
1501
        int packet_count[2];
1502
        uint8_t packet[TS_PACKET_SIZE];
1503

    
1504
        /* only read packets */
1505

    
1506
        st = av_new_stream(s, 0);
1507
        if (!st)
1508
            goto fail;
1509
        av_set_pts_info(st, 60, 1, 27000000);
1510
        st->codec->codec_type = AVMEDIA_TYPE_DATA;
1511
        st->codec->codec_id = CODEC_ID_MPEG2TS;
1512

    
1513
        /* we iterate until we find two PCRs to estimate the bitrate */
1514
        pcr_pid = -1;
1515
        nb_pcrs = 0;
1516
        nb_packets = 0;
1517
        for(;;) {
1518
            ret = read_packet(s, packet, ts->raw_packet_size);
1519
            if (ret < 0)
1520
                return -1;
1521
            pid = AV_RB16(packet + 1) & 0x1fff;
1522
            if ((pcr_pid == -1 || pcr_pid == pid) &&
1523
                parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1524
                pcr_pid = pid;
1525
                packet_count[nb_pcrs] = nb_packets;
1526
                pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1527
                nb_pcrs++;
1528
                if (nb_pcrs >= 2)
1529
                    break;
1530
            }
1531
            nb_packets++;
1532
        }
1533

    
1534
        /* NOTE1: the bitrate is computed without the FEC */
1535
        /* NOTE2: it is only the bitrate of the start of the stream */
1536
        ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1537
        ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1538
        s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1539
        st->codec->bit_rate = s->bit_rate;
1540
        st->start_time = ts->cur_pcr;
1541
#if 0
1542
        av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1543
               st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1544
#endif
1545
    }
1546

    
1547
    avio_seek(pb, pos, SEEK_SET);
1548
    return 0;
1549
 fail:
1550
    return -1;
1551
}
1552

    
1553
#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1554

    
1555
static int mpegts_raw_read_packet(AVFormatContext *s,
1556
                                  AVPacket *pkt)
1557
{
1558
    MpegTSContext *ts = s->priv_data;
1559
    int ret, i;
1560
    int64_t pcr_h, next_pcr_h, pos;
1561
    int pcr_l, next_pcr_l;
1562
    uint8_t pcr_buf[12];
1563

    
1564
    if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1565
        return AVERROR(ENOMEM);
1566
    pkt->pos= avio_tell(s->pb);
1567
    ret = read_packet(s, pkt->data, ts->raw_packet_size);
1568
    if (ret < 0) {
1569
        av_free_packet(pkt);
1570
        return ret;
1571
    }
1572
    if (ts->mpeg2ts_compute_pcr) {
1573
        /* compute exact PCR for each packet */
1574
        if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1575
            /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1576
            pos = avio_tell(s->pb);
1577
            for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1578
                avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1579
                avio_read(s->pb, pcr_buf, 12);
1580
                if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1581
                    /* XXX: not precise enough */
1582
                    ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1583
                        (i + 1);
1584
                    break;
1585
                }
1586
            }
1587
            avio_seek(s->pb, pos, SEEK_SET);
1588
            /* no next PCR found: we use previous increment */
1589
            ts->cur_pcr = pcr_h * 300 + pcr_l;
1590
        }
1591
        pkt->pts = ts->cur_pcr;
1592
        pkt->duration = ts->pcr_incr;
1593
        ts->cur_pcr += ts->pcr_incr;
1594
    }
1595
    pkt->stream_index = 0;
1596
    return 0;
1597
}
1598

    
1599
static int mpegts_read_packet(AVFormatContext *s,
1600
                              AVPacket *pkt)
1601
{
1602
    MpegTSContext *ts = s->priv_data;
1603
    int ret, i;
1604

    
1605
    if (avio_tell(s->pb) != ts->last_pos) {
1606
        /* seek detected, flush pes buffer */
1607
        for (i = 0; i < NB_PID_MAX; i++) {
1608
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1609
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1610
                av_freep(&pes->buffer);
1611
                pes->data_index = 0;
1612
                pes->state = MPEGTS_SKIP; /* skip until pes header */
1613
            }
1614
        }
1615
    }
1616

    
1617
    ts->pkt = pkt;
1618
    ret = handle_packets(ts, 0);
1619
    if (ret < 0) {
1620
        /* flush pes data left */
1621
        for (i = 0; i < NB_PID_MAX; i++) {
1622
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1623
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1624
                if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1625
                    new_pes_packet(pes, pkt);
1626
                    pes->state = MPEGTS_SKIP;
1627
                    ret = 0;
1628
                    break;
1629
                }
1630
            }
1631
        }
1632
    }
1633

    
1634
    ts->last_pos = avio_tell(s->pb);
1635

    
1636
    return ret;
1637
}
1638

    
1639
static int mpegts_read_close(AVFormatContext *s)
1640
{
1641
    MpegTSContext *ts = s->priv_data;
1642
    int i;
1643

    
1644
    clear_programs(ts);
1645

    
1646
    for(i=0;i<NB_PID_MAX;i++)
1647
        if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1648

    
1649
    return 0;
1650
}
1651

    
1652
static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1653
                              int64_t *ppos, int64_t pos_limit)
1654
{
1655
    MpegTSContext *ts = s->priv_data;
1656
    int64_t pos, timestamp;
1657
    uint8_t buf[TS_PACKET_SIZE];
1658
    int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1659
    const int find_next= 1;
1660
    pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1661
    if (find_next) {
1662
        for(;;) {
1663
            avio_seek(s->pb, pos, SEEK_SET);
1664
            if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1665
                return AV_NOPTS_VALUE;
1666
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1667
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1668
                break;
1669
            }
1670
            pos += ts->raw_packet_size;
1671
        }
1672
    } else {
1673
        for(;;) {
1674
            pos -= ts->raw_packet_size;
1675
            if (pos < 0)
1676
                return AV_NOPTS_VALUE;
1677
            avio_seek(s->pb, pos, SEEK_SET);
1678
            if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1679
                return AV_NOPTS_VALUE;
1680
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1681
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1682
                break;
1683
            }
1684
        }
1685
    }
1686
    *ppos = pos;
1687

    
1688
    return timestamp;
1689
}
1690

    
1691
#ifdef USE_SYNCPOINT_SEARCH
1692

    
1693
static int read_seek2(AVFormatContext *s,
1694
                      int stream_index,
1695
                      int64_t min_ts,
1696
                      int64_t target_ts,
1697
                      int64_t max_ts,
1698
                      int flags)
1699
{
1700
    int64_t pos;
1701

    
1702
    int64_t ts_ret, ts_adj;
1703
    int stream_index_gen_search;
1704
    AVStream *st;
1705
    AVParserState *backup;
1706

    
1707
    backup = ff_store_parser_state(s);
1708

    
1709
    // detect direction of seeking for search purposes
1710
    flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1711
             AVSEEK_FLAG_BACKWARD : 0;
1712

    
1713
    if (flags & AVSEEK_FLAG_BYTE) {
1714
        // use position directly, we will search starting from it
1715
        pos = target_ts;
1716
    } else {
1717
        // search for some position with good timestamp match
1718
        if (stream_index < 0) {
1719
            stream_index_gen_search = av_find_default_stream_index(s);
1720
            if (stream_index_gen_search < 0) {
1721
                ff_restore_parser_state(s, backup);
1722
                return -1;
1723
            }
1724

    
1725
            st = s->streams[stream_index_gen_search];
1726
            // timestamp for default must be expressed in AV_TIME_BASE units
1727
            ts_adj = av_rescale(target_ts,
1728
                                st->time_base.den,
1729
                                AV_TIME_BASE * (int64_t)st->time_base.num);
1730
        } else {
1731
            ts_adj = target_ts;
1732
            stream_index_gen_search = stream_index;
1733
        }
1734
        pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1735
                            0, INT64_MAX, -1,
1736
                            AV_NOPTS_VALUE,
1737
                            AV_NOPTS_VALUE,
1738
                            flags, &ts_ret, mpegts_get_pcr);
1739
        if (pos < 0) {
1740
            ff_restore_parser_state(s, backup);
1741
            return -1;
1742
        }
1743
    }
1744

    
1745
    // search for actual matching keyframe/starting position for all streams
1746
    if (ff_gen_syncpoint_search(s, stream_index, pos,
1747
                                min_ts, target_ts, max_ts,
1748
                                flags) < 0) {
1749
        ff_restore_parser_state(s, backup);
1750
        return -1;
1751
    }
1752

    
1753
    ff_free_parser_state(s, backup);
1754
    return 0;
1755
}
1756

    
1757
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1758
{
1759
    int ret;
1760
    if (flags & AVSEEK_FLAG_BACKWARD) {
1761
        flags &= ~AVSEEK_FLAG_BACKWARD;
1762
        ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1763
        if (ret < 0)
1764
            // for compatibility reasons, seek to the best-fitting timestamp
1765
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1766
    } else {
1767
        ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1768
        if (ret < 0)
1769
            // for compatibility reasons, seek to the best-fitting timestamp
1770
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1771
    }
1772
    return ret;
1773
}
1774

    
1775
#else
1776

    
1777
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1778
    MpegTSContext *ts = s->priv_data;
1779
    uint8_t buf[TS_PACKET_SIZE];
1780
    int64_t pos;
1781

    
1782
    if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1783
        return -1;
1784

    
1785
    pos= avio_tell(s->pb);
1786

    
1787
    for(;;) {
1788
        avio_seek(s->pb, pos, SEEK_SET);
1789
        if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1790
            return -1;
1791
//        pid = AV_RB16(buf + 1) & 0x1fff;
1792
        if(buf[1] & 0x40) break;
1793
        pos += ts->raw_packet_size;
1794
    }
1795
    avio_seek(s->pb, pos, SEEK_SET);
1796

    
1797
    return 0;
1798
}
1799

    
1800
#endif
1801

    
1802
/**************************************************************/
1803
/* parsing functions - called from other demuxers such as RTP */
1804

    
1805
MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1806
{
1807
    MpegTSContext *ts;
1808

    
1809
    ts = av_mallocz(sizeof(MpegTSContext));
1810
    if (!ts)
1811
        return NULL;
1812
    /* no stream case, currently used by RTP */
1813
    ts->raw_packet_size = TS_PACKET_SIZE;
1814
    ts->stream = s;
1815
    ts->auto_guess = 1;
1816
    return ts;
1817
}
1818

    
1819
/* return the consumed length if a packet was output, or -1 if no
1820
   packet is output */
1821
int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1822
                        const uint8_t *buf, int len)
1823
{
1824
    int len1;
1825

    
1826
    len1 = len;
1827
    ts->pkt = pkt;
1828
    ts->stop_parse = 0;
1829
    for(;;) {
1830
        if (ts->stop_parse>0)
1831
            break;
1832
        if (len < TS_PACKET_SIZE)
1833
            return -1;
1834
        if (buf[0] != 0x47) {
1835
            buf++;
1836
            len--;
1837
        } else {
1838
            handle_packet(ts, buf);
1839
            buf += TS_PACKET_SIZE;
1840
            len -= TS_PACKET_SIZE;
1841
        }
1842
    }
1843
    return len1 - len;
1844
}
1845

    
1846
void ff_mpegts_parse_close(MpegTSContext *ts)
1847
{
1848
    int i;
1849

    
1850
    for(i=0;i<NB_PID_MAX;i++)
1851
        av_free(ts->pids[i]);
1852
    av_free(ts);
1853
}
1854

    
1855
AVInputFormat ff_mpegts_demuxer = {
1856
    "mpegts",
1857
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1858
    sizeof(MpegTSContext),
1859
    mpegts_probe,
1860
    mpegts_read_header,
1861
    mpegts_read_packet,
1862
    mpegts_read_close,
1863
    read_seek,
1864
    mpegts_get_pcr,
1865
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1866
#ifdef USE_SYNCPOINT_SEARCH
1867
    .read_seek2 = read_seek2,
1868
#endif
1869
};
1870

    
1871
AVInputFormat ff_mpegtsraw_demuxer = {
1872
    "mpegtsraw",
1873
    NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1874
    sizeof(MpegTSContext),
1875
    NULL,
1876
    mpegts_read_header,
1877
    mpegts_raw_read_packet,
1878
    mpegts_read_close,
1879
    read_seek,
1880
    mpegts_get_pcr,
1881
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1882
#ifdef USE_SYNCPOINT_SEARCH
1883
    .read_seek2 = read_seek2,
1884
#endif
1885
};