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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
 *
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 * 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.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

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

    
26
#include "libavutil/crc.h"
27
#include "libavutil/intreadwrite.h"
28
#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "mpegts.h"
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#include "internal.h"
32
#include "seek.h"
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#include "mpeg.h"
34
#include "isom.h"
35

    
36
/* maximum size in which we look for synchronisation if
37
   synchronisation is lost */
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#define MAX_RESYNC_SIZE 65536
39

    
40
#define MAX_PES_PAYLOAD 200*1024
41

    
42
enum MpegTSFilterType {
43
    MPEGTS_PES,
44
    MPEGTS_SECTION,
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};
46

    
47
typedef struct MpegTSFilter MpegTSFilter;
48

    
49
typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
50

    
51
typedef struct MpegTSPESFilter {
52
    PESCallback *pes_cb;
53
    void *opaque;
54
} MpegTSPESFilter;
55

    
56
typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
57

    
58
typedef void SetServiceCallback(void *opaque, int ret);
59

    
60
typedef struct MpegTSSectionFilter {
61
    int section_index;
62
    int section_h_size;
63
    uint8_t *section_buf;
64
    unsigned int check_crc:1;
65
    unsigned int end_of_section_reached:1;
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    SectionCallback *section_cb;
67
    void *opaque;
68
} MpegTSSectionFilter;
69

    
70
struct MpegTSFilter {
71
    int pid;
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    int last_cc; /* last cc code (-1 if first packet) */
73
    enum MpegTSFilterType type;
74
    union {
75
        MpegTSPESFilter pes_filter;
76
        MpegTSSectionFilter section_filter;
77
    } u;
78
};
79

    
80
#define MAX_PIDS_PER_PROGRAM 64
81
struct Program {
82
    unsigned int id; //program id/service id
83
    unsigned int nb_pids;
84
    unsigned int pids[MAX_PIDS_PER_PROGRAM];
85
};
86

    
87
struct MpegTSContext {
88
    /* user data */
89
    AVFormatContext *stream;
90
    /** raw packet size, including FEC if present            */
91
    int raw_packet_size;
92

    
93
    int pos47;
94

    
95
    /** if true, all pids are analyzed to find streams       */
96
    int auto_guess;
97

    
98
    /** compute exact PCR for each transport stream packet   */
99
    int mpeg2ts_compute_pcr;
100

    
101
    int64_t cur_pcr;    /**< used to estimate the exact PCR  */
102
    int pcr_incr;       /**< used to estimate the exact PCR  */
103

    
104
    /* data needed to handle file based ts */
105
    /** stop parsing loop                                    */
106
    int stop_parse;
107
    /** packet containing Audio/Video data                   */
108
    AVPacket *pkt;
109
    /** to detect seek                                       */
110
    int64_t last_pos;
111

    
112
    /******************************************/
113
    /* private mpegts data */
114
    /* scan context */
115
    /** structure to keep track of Program->pids mapping     */
116
    unsigned int nb_prg;
117
    struct Program *prg;
118

    
119

    
120
    /** filters for various streams specified by PMT + for the PAT and PMT */
121
    MpegTSFilter *pids[NB_PID_MAX];
122
};
123

    
124
/* TS stream handling */
125

    
126
enum MpegTSState {
127
    MPEGTS_HEADER = 0,
128
    MPEGTS_PESHEADER,
129
    MPEGTS_PESHEADER_FILL,
130
    MPEGTS_PAYLOAD,
131
    MPEGTS_SKIP,
132
};
133

    
134
/* enough for PES header + length */
135
#define PES_START_SIZE  6
136
#define PES_HEADER_SIZE 9
137
#define MAX_PES_HEADER_SIZE (9 + 255)
138

    
139
typedef struct PESContext {
140
    int pid;
141
    int pcr_pid; /**< if -1 then all packets containing PCR are considered */
142
    int stream_type;
143
    MpegTSContext *ts;
144
    AVFormatContext *stream;
145
    AVStream *st;
146
    AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
147
    enum MpegTSState state;
148
    /* used to get the format */
149
    int data_index;
150
    int total_size;
151
    int pes_header_size;
152
    int extended_stream_id;
153
    int64_t pts, dts;
154
    int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
155
    uint8_t header[MAX_PES_HEADER_SIZE];
156
    uint8_t *buffer;
157
} PESContext;
158

    
159
extern AVInputFormat ff_mpegts_demuxer;
160

    
161
static void clear_program(MpegTSContext *ts, unsigned int programid)
162
{
163
    int i;
164

    
165
    for(i=0; i<ts->nb_prg; i++)
166
        if(ts->prg[i].id == programid)
167
            ts->prg[i].nb_pids = 0;
168
}
169

    
170
static void clear_programs(MpegTSContext *ts)
171
{
172
    av_freep(&ts->prg);
173
    ts->nb_prg=0;
174
}
175

    
176
static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
177
{
178
    struct Program *p;
179
    void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
180
    if(!tmp)
181
        return;
182
    ts->prg = tmp;
183
    p = &ts->prg[ts->nb_prg];
184
    p->id = programid;
185
    p->nb_pids = 0;
186
    ts->nb_prg++;
187
}
188

    
189
static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
190
{
191
    int i;
192
    struct Program *p = NULL;
193
    for(i=0; i<ts->nb_prg; i++) {
194
        if(ts->prg[i].id == programid) {
195
            p = &ts->prg[i];
196
            break;
197
        }
198
    }
199
    if(!p)
200
        return;
201

    
202
    if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
203
        return;
204
    p->pids[p->nb_pids++] = pid;
205
}
206

    
207
/**
208
 * \brief discard_pid() decides if the pid is to be discarded according
209
 *                      to caller's programs selection
210
 * \param ts    : - TS context
211
 * \param pid   : - pid
212
 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
213
 *         0 otherwise
214
 */
215
static int discard_pid(MpegTSContext *ts, unsigned int pid)
216
{
217
    int i, j, k;
218
    int used = 0, discarded = 0;
219
    struct Program *p;
220
    for(i=0; i<ts->nb_prg; i++) {
221
        p = &ts->prg[i];
222
        for(j=0; j<p->nb_pids; j++) {
223
            if(p->pids[j] != pid)
224
                continue;
225
            //is program with id p->id set to be discarded?
226
            for(k=0; k<ts->stream->nb_programs; k++) {
227
                if(ts->stream->programs[k]->id == p->id) {
228
                    if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
229
                        discarded++;
230
                    else
231
                        used++;
232
                }
233
            }
234
        }
235
    }
236

    
237
    return !used && discarded;
238
}
239

    
240
/**
241
 *  Assemble PES packets out of TS packets, and then call the "section_cb"
242
 *  function when they are complete.
243
 */
244
static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
245
                               const uint8_t *buf, int buf_size, int is_start)
246
{
247
    MpegTSSectionFilter *tss = &tss1->u.section_filter;
248
    int len;
249

    
250
    if (is_start) {
251
        memcpy(tss->section_buf, buf, buf_size);
252
        tss->section_index = buf_size;
253
        tss->section_h_size = -1;
254
        tss->end_of_section_reached = 0;
255
    } else {
256
        if (tss->end_of_section_reached)
257
            return;
258
        len = 4096 - tss->section_index;
259
        if (buf_size < len)
260
            len = buf_size;
261
        memcpy(tss->section_buf + tss->section_index, buf, len);
262
        tss->section_index += len;
263
    }
264

    
265
    /* compute section length if possible */
266
    if (tss->section_h_size == -1 && tss->section_index >= 3) {
267
        len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
268
        if (len > 4096)
269
            return;
270
        tss->section_h_size = len;
271
    }
272

    
273
    if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
274
        tss->end_of_section_reached = 1;
275
        if (!tss->check_crc ||
276
            av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
277
                   tss->section_buf, tss->section_h_size) == 0)
278
            tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
279
    }
280
}
281

    
282
static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
283
                                         SectionCallback *section_cb, void *opaque,
284
                                         int check_crc)
285

    
286
{
287
    MpegTSFilter *filter;
288
    MpegTSSectionFilter *sec;
289

    
290
    av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
291

    
292
    if (pid >= NB_PID_MAX || ts->pids[pid])
293
        return NULL;
294
    filter = av_mallocz(sizeof(MpegTSFilter));
295
    if (!filter)
296
        return NULL;
297
    ts->pids[pid] = filter;
298
    filter->type = MPEGTS_SECTION;
299
    filter->pid = pid;
300
    filter->last_cc = -1;
301
    sec = &filter->u.section_filter;
302
    sec->section_cb = section_cb;
303
    sec->opaque = opaque;
304
    sec->section_buf = av_malloc(MAX_SECTION_SIZE);
305
    sec->check_crc = check_crc;
306
    if (!sec->section_buf) {
307
        av_free(filter);
308
        return NULL;
309
    }
310
    return filter;
311
}
312

    
313
static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
314
                                     PESCallback *pes_cb,
315
                                     void *opaque)
316
{
317
    MpegTSFilter *filter;
318
    MpegTSPESFilter *pes;
319

    
320
    if (pid >= NB_PID_MAX || ts->pids[pid])
321
        return NULL;
322
    filter = av_mallocz(sizeof(MpegTSFilter));
323
    if (!filter)
324
        return NULL;
325
    ts->pids[pid] = filter;
326
    filter->type = MPEGTS_PES;
327
    filter->pid = pid;
328
    filter->last_cc = -1;
329
    pes = &filter->u.pes_filter;
330
    pes->pes_cb = pes_cb;
331
    pes->opaque = opaque;
332
    return filter;
333
}
334

    
335
static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
336
{
337
    int pid;
338

    
339
    pid = filter->pid;
340
    if (filter->type == MPEGTS_SECTION)
341
        av_freep(&filter->u.section_filter.section_buf);
342
    else if (filter->type == MPEGTS_PES) {
343
        PESContext *pes = filter->u.pes_filter.opaque;
344
        av_freep(&pes->buffer);
345
        /* referenced private data will be freed later in
346
         * av_close_input_stream */
347
        if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
348
            av_freep(&filter->u.pes_filter.opaque);
349
        }
350
    }
351

    
352
    av_free(filter);
353
    ts->pids[pid] = NULL;
354
}
355

    
356
static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
357
    int stat[TS_MAX_PACKET_SIZE];
358
    int i;
359
    int x=0;
360
    int best_score=0;
361

    
362
    memset(stat, 0, packet_size*sizeof(int));
363

    
364
    for(x=i=0; i<size-3; i++){
365
        if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
366
            stat[x]++;
367
            if(stat[x] > best_score){
368
                best_score= stat[x];
369
                if(index) *index= x;
370
            }
371
        }
372

    
373
        x++;
374
        if(x == packet_size) x= 0;
375
    }
376

    
377
    return best_score;
378
}
379

    
380
/* autodetect fec presence. Must have at least 1024 bytes  */
381
static int get_packet_size(const uint8_t *buf, int size)
382
{
383
    int score, fec_score, dvhs_score;
384

    
385
    if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
386
        return -1;
387

    
388
    score    = analyze(buf, size, TS_PACKET_SIZE, NULL);
389
    dvhs_score    = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
390
    fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
391
//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
392

    
393
    if     (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
394
    else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
395
    else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
396
    else                       return -1;
397
}
398

    
399
typedef struct SectionHeader {
400
    uint8_t tid;
401
    uint16_t id;
402
    uint8_t version;
403
    uint8_t sec_num;
404
    uint8_t last_sec_num;
405
} SectionHeader;
406

    
407
static inline int get8(const uint8_t **pp, const uint8_t *p_end)
408
{
409
    const uint8_t *p;
410
    int c;
411

    
412
    p = *pp;
413
    if (p >= p_end)
414
        return -1;
415
    c = *p++;
416
    *pp = p;
417
    return c;
418
}
419

    
420
static inline int get16(const uint8_t **pp, const uint8_t *p_end)
421
{
422
    const uint8_t *p;
423
    int c;
424

    
425
    p = *pp;
426
    if ((p + 1) >= p_end)
427
        return -1;
428
    c = AV_RB16(p);
429
    p += 2;
430
    *pp = p;
431
    return c;
432
}
433

    
434
/* read and allocate a DVB string preceeded by its length */
435
static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
436
{
437
    int len;
438
    const uint8_t *p;
439
    char *str;
440

    
441
    p = *pp;
442
    len = get8(&p, p_end);
443
    if (len < 0)
444
        return NULL;
445
    if ((p + len) > p_end)
446
        return NULL;
447
    str = av_malloc(len + 1);
448
    if (!str)
449
        return NULL;
450
    memcpy(str, p, len);
451
    str[len] = '\0';
452
    p += len;
453
    *pp = p;
454
    return str;
455
}
456

    
457
static int parse_section_header(SectionHeader *h,
458
                                const uint8_t **pp, const uint8_t *p_end)
459
{
460
    int val;
461

    
462
    val = get8(pp, p_end);
463
    if (val < 0)
464
        return -1;
465
    h->tid = val;
466
    *pp += 2;
467
    val = get16(pp, p_end);
468
    if (val < 0)
469
        return -1;
470
    h->id = val;
471
    val = get8(pp, p_end);
472
    if (val < 0)
473
        return -1;
474
    h->version = (val >> 1) & 0x1f;
475
    val = get8(pp, p_end);
476
    if (val < 0)
477
        return -1;
478
    h->sec_num = val;
479
    val = get8(pp, p_end);
480
    if (val < 0)
481
        return -1;
482
    h->last_sec_num = val;
483
    return 0;
484
}
485

    
486
typedef struct {
487
    uint32_t stream_type;
488
    enum AVMediaType codec_type;
489
    enum CodecID codec_id;
490
} StreamType;
491

    
492
static const StreamType ISO_types[] = {
493
    { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
494
    { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
495
    { 0x03, AVMEDIA_TYPE_AUDIO,        CODEC_ID_MP3 },
496
    { 0x04, AVMEDIA_TYPE_AUDIO,        CODEC_ID_MP3 },
497
    { 0x0f, AVMEDIA_TYPE_AUDIO,        CODEC_ID_AAC },
498
    { 0x10, AVMEDIA_TYPE_VIDEO,      CODEC_ID_MPEG4 },
499
    { 0x11, AVMEDIA_TYPE_AUDIO,   CODEC_ID_AAC_LATM }, /* LATM syntax */
500
    { 0x1b, AVMEDIA_TYPE_VIDEO,       CODEC_ID_H264 },
501
    { 0xd1, AVMEDIA_TYPE_VIDEO,      CODEC_ID_DIRAC },
502
    { 0xea, AVMEDIA_TYPE_VIDEO,        CODEC_ID_VC1 },
503
    { 0 },
504
};
505

    
506
static const StreamType HDMV_types[] = {
507
    { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
508
    { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
509
    { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
510
    { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
511
    { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
512
    { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
513
    { 0 },
514
};
515

    
516
/* ATSC ? */
517
static const StreamType MISC_types[] = {
518
    { 0x81, AVMEDIA_TYPE_AUDIO,   CODEC_ID_AC3 },
519
    { 0x8a, AVMEDIA_TYPE_AUDIO,   CODEC_ID_DTS },
520
    { 0 },
521
};
522

    
523
static const StreamType REGD_types[] = {
524
    { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
525
    { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO,   CODEC_ID_AC3 },
526
    { 0 },
527
};
528

    
529
/* descriptor present */
530
static const StreamType DESC_types[] = {
531
    { 0x6a, AVMEDIA_TYPE_AUDIO,             CODEC_ID_AC3 }, /* AC-3 descriptor */
532
    { 0x7a, AVMEDIA_TYPE_AUDIO,            CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
533
    { 0x7b, AVMEDIA_TYPE_AUDIO,             CODEC_ID_DTS },
534
    { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
535
    { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
536
    { 0 },
537
};
538

    
539
static void mpegts_find_stream_type(AVStream *st,
540
                                    uint32_t stream_type, const StreamType *types)
541
{
542
    for (; types->stream_type; types++) {
543
        if (stream_type == types->stream_type) {
544
            st->codec->codec_type = types->codec_type;
545
            st->codec->codec_id   = types->codec_id;
546
            return;
547
        }
548
    }
549
}
550

    
551
static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
552
                                  uint32_t stream_type, uint32_t prog_reg_desc)
553
{
554
    av_set_pts_info(st, 33, 1, 90000);
555
    st->priv_data = pes;
556
    st->codec->codec_type = AVMEDIA_TYPE_DATA;
557
    st->codec->codec_id   = CODEC_ID_NONE;
558
    st->need_parsing = AVSTREAM_PARSE_FULL;
559
    pes->st = st;
560
    pes->stream_type = stream_type;
561

    
562
    av_log(pes->stream, AV_LOG_DEBUG,
563
           "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
564
           st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
565

    
566
    st->codec->codec_tag = pes->stream_type;
567

    
568
    mpegts_find_stream_type(st, pes->stream_type, ISO_types);
569
    if (prog_reg_desc == AV_RL32("HDMV") &&
570
        st->codec->codec_id == CODEC_ID_NONE) {
571
        mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
572
        if (pes->stream_type == 0x83) {
573
            // HDMV TrueHD streams also contain an AC3 coded version of the
574
            // audio track - add a second stream for this
575
            AVStream *sub_st;
576
            // priv_data cannot be shared between streams
577
            PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
578
            if (!sub_pes)
579
                return AVERROR(ENOMEM);
580
            memcpy(sub_pes, pes, sizeof(*sub_pes));
581

    
582
            sub_st = av_new_stream(pes->stream, pes->pid);
583
            if (!sub_st) {
584
                av_free(sub_pes);
585
                return AVERROR(ENOMEM);
586
            }
587

    
588
            av_set_pts_info(sub_st, 33, 1, 90000);
589
            sub_st->priv_data = sub_pes;
590
            sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
591
            sub_st->codec->codec_id   = CODEC_ID_AC3;
592
            sub_st->need_parsing = AVSTREAM_PARSE_FULL;
593
            sub_pes->sub_st = pes->sub_st = sub_st;
594
        }
595
    }
596
    if (st->codec->codec_id == CODEC_ID_NONE)
597
        mpegts_find_stream_type(st, pes->stream_type, MISC_types);
598

    
599
    return 0;
600
}
601

    
602
static void new_pes_packet(PESContext *pes, AVPacket *pkt)
603
{
604
    av_init_packet(pkt);
605

    
606
    pkt->destruct = av_destruct_packet;
607
    pkt->data = pes->buffer;
608
    pkt->size = pes->data_index;
609
    memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
610

    
611
    // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
612
    if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
613
        pkt->stream_index = pes->sub_st->index;
614
    else
615
        pkt->stream_index = pes->st->index;
616
    pkt->pts = pes->pts;
617
    pkt->dts = pes->dts;
618
    /* store position of first TS packet of this PES packet */
619
    pkt->pos = pes->ts_packet_pos;
620

    
621
    /* reset pts values */
622
    pes->pts = AV_NOPTS_VALUE;
623
    pes->dts = AV_NOPTS_VALUE;
624
    pes->buffer = NULL;
625
    pes->data_index = 0;
626
}
627

    
628
/* return non zero if a packet could be constructed */
629
static int mpegts_push_data(MpegTSFilter *filter,
630
                            const uint8_t *buf, int buf_size, int is_start,
631
                            int64_t pos)
632
{
633
    PESContext *pes = filter->u.pes_filter.opaque;
634
    MpegTSContext *ts = pes->ts;
635
    const uint8_t *p;
636
    int len, code;
637

    
638
    if(!ts->pkt)
639
        return 0;
640

    
641
    if (is_start) {
642
        if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
643
            new_pes_packet(pes, ts->pkt);
644
            ts->stop_parse = 1;
645
        }
646
        pes->state = MPEGTS_HEADER;
647
        pes->data_index = 0;
648
        pes->ts_packet_pos = pos;
649
    }
650
    p = buf;
651
    while (buf_size > 0) {
652
        switch(pes->state) {
653
        case MPEGTS_HEADER:
654
            len = PES_START_SIZE - pes->data_index;
655
            if (len > buf_size)
656
                len = buf_size;
657
            memcpy(pes->header + pes->data_index, p, len);
658
            pes->data_index += len;
659
            p += len;
660
            buf_size -= len;
661
            if (pes->data_index == PES_START_SIZE) {
662
                /* we got all the PES or section header. We can now
663
                   decide */
664
#if 0
665
                av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
666
#endif
667
                if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
668
                    pes->header[2] == 0x01) {
669
                    /* it must be an mpeg2 PES stream */
670
                    code = pes->header[3] | 0x100;
671
                    av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
672

    
673
                    if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
674
                        code == 0x1be) /* padding_stream */
675
                        goto skip;
676

    
677
#if FF_API_MAX_STREAMS
678
                    if (!pes->st && pes->stream->nb_streams == MAX_STREAMS)
679
                        goto skip;
680
#endif
681

    
682
                    /* stream not present in PMT */
683
                    if (!pes->st) {
684
                        pes->st = av_new_stream(ts->stream, pes->pid);
685
                        if (!pes->st)
686
                            return AVERROR(ENOMEM);
687
                        mpegts_set_stream_info(pes->st, pes, 0, 0);
688
                    }
689

    
690
                    pes->total_size = AV_RB16(pes->header + 4);
691
                    /* NOTE: a zero total size means the PES size is
692
                       unbounded */
693
                    if (!pes->total_size)
694
                        pes->total_size = MAX_PES_PAYLOAD;
695

    
696
                    /* allocate pes buffer */
697
                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
698
                    if (!pes->buffer)
699
                        return AVERROR(ENOMEM);
700

    
701
                    if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
702
                        code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
703
                        code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
704
                        code != 0x1f8) {                  /* ITU-T Rec. H.222.1 type E stream */
705
                        pes->state = MPEGTS_PESHEADER;
706
                        if (pes->st->codec->codec_id == CODEC_ID_NONE) {
707
                            av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
708
                                    pes->pid, pes->stream_type);
709
                            pes->st->codec->codec_id = CODEC_ID_PROBE;
710
                        }
711
                    } else {
712
                        pes->state = MPEGTS_PAYLOAD;
713
                        pes->data_index = 0;
714
                    }
715
                } else {
716
                    /* otherwise, it should be a table */
717
                    /* skip packet */
718
                skip:
719
                    pes->state = MPEGTS_SKIP;
720
                    continue;
721
                }
722
            }
723
            break;
724
            /**********************************************/
725
            /* PES packing parsing */
726
        case MPEGTS_PESHEADER:
727
            len = PES_HEADER_SIZE - pes->data_index;
728
            if (len < 0)
729
                return -1;
730
            if (len > buf_size)
731
                len = buf_size;
732
            memcpy(pes->header + pes->data_index, p, len);
733
            pes->data_index += len;
734
            p += len;
735
            buf_size -= len;
736
            if (pes->data_index == PES_HEADER_SIZE) {
737
                pes->pes_header_size = pes->header[8] + 9;
738
                pes->state = MPEGTS_PESHEADER_FILL;
739
            }
740
            break;
741
        case MPEGTS_PESHEADER_FILL:
742
            len = pes->pes_header_size - pes->data_index;
743
            if (len < 0)
744
                return -1;
745
            if (len > buf_size)
746
                len = buf_size;
747
            memcpy(pes->header + pes->data_index, p, len);
748
            pes->data_index += len;
749
            p += len;
750
            buf_size -= len;
751
            if (pes->data_index == pes->pes_header_size) {
752
                const uint8_t *r;
753
                unsigned int flags, pes_ext, skip;
754

    
755
                flags = pes->header[7];
756
                r = pes->header + 9;
757
                pes->pts = AV_NOPTS_VALUE;
758
                pes->dts = AV_NOPTS_VALUE;
759
                if ((flags & 0xc0) == 0x80) {
760
                    pes->dts = pes->pts = ff_parse_pes_pts(r);
761
                    r += 5;
762
                } else if ((flags & 0xc0) == 0xc0) {
763
                    pes->pts = ff_parse_pes_pts(r);
764
                    r += 5;
765
                    pes->dts = ff_parse_pes_pts(r);
766
                    r += 5;
767
                }
768
                pes->extended_stream_id = -1;
769
                if (flags & 0x01) { /* PES extension */
770
                    pes_ext = *r++;
771
                    /* Skip PES private data, program packet sequence counter and P-STD buffer */
772
                    skip = (pes_ext >> 4) & 0xb;
773
                    skip += skip & 0x9;
774
                    r += skip;
775
                    if ((pes_ext & 0x41) == 0x01 &&
776
                        (r + 2) <= (pes->header + pes->pes_header_size)) {
777
                        /* PES extension 2 */
778
                        if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
779
                            pes->extended_stream_id = r[1];
780
                    }
781
                }
782

    
783
                /* we got the full header. We parse it and get the payload */
784
                pes->state = MPEGTS_PAYLOAD;
785
                pes->data_index = 0;
786
            }
787
            break;
788
        case MPEGTS_PAYLOAD:
789
            if (buf_size > 0 && pes->buffer) {
790
                if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
791
                    new_pes_packet(pes, ts->pkt);
792
                    pes->total_size = MAX_PES_PAYLOAD;
793
                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
794
                    if (!pes->buffer)
795
                        return AVERROR(ENOMEM);
796
                    ts->stop_parse = 1;
797
                } else if (pes->data_index == 0 && buf_size > pes->total_size) {
798
                    // pes packet size is < ts size packet and pes data is padded with 0xff
799
                    // not sure if this is legal in ts but see issue #2392
800
                    buf_size = pes->total_size;
801
                }
802
                memcpy(pes->buffer+pes->data_index, p, buf_size);
803
                pes->data_index += buf_size;
804
            }
805
            buf_size = 0;
806
            /* emit complete packets with known packet size
807
             * decreases demuxer delay for infrequent packets like subtitles from
808
             * a couple of seconds to milliseconds for properly muxed files.
809
             * total_size is the number of bytes following pes_packet_length
810
             * in the pes header, i.e. not counting the first 6 bytes */
811
            if (pes->total_size < MAX_PES_PAYLOAD &&
812
                pes->pes_header_size + pes->data_index == pes->total_size + 6) {
813
                ts->stop_parse = 1;
814
                new_pes_packet(pes, ts->pkt);
815
            }
816
            break;
817
        case MPEGTS_SKIP:
818
            buf_size = 0;
819
            break;
820
        }
821
    }
822

    
823
    return 0;
824
}
825

    
826
static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
827
{
828
    MpegTSFilter *tss;
829
    PESContext *pes;
830

    
831
    /* if no pid found, then add a pid context */
832
    pes = av_mallocz(sizeof(PESContext));
833
    if (!pes)
834
        return 0;
835
    pes->ts = ts;
836
    pes->stream = ts->stream;
837
    pes->pid = pid;
838
    pes->pcr_pid = pcr_pid;
839
    pes->state = MPEGTS_SKIP;
840
    pes->pts = AV_NOPTS_VALUE;
841
    pes->dts = AV_NOPTS_VALUE;
842
    tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
843
    if (!tss) {
844
        av_free(pes);
845
        return 0;
846
    }
847
    return pes;
848
}
849

    
850
static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
851
                         int *es_id, uint8_t **dec_config_descr,
852
                         int *dec_config_descr_size)
853
{
854
    ByteIOContext pb;
855
    int tag;
856
    unsigned len;
857

    
858
    init_put_byte(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
859

    
860
    len = ff_mp4_read_descr(s, &pb, &tag);
861
    if (tag == MP4IODescrTag) {
862
        get_be16(&pb); // ID
863
        get_byte(&pb);
864
        get_byte(&pb);
865
        get_byte(&pb);
866
        get_byte(&pb);
867
        get_byte(&pb);
868
        len = ff_mp4_read_descr(s, &pb, &tag);
869
        if (tag == MP4ESDescrTag) {
870
            *es_id = get_be16(&pb); /* ES_ID */
871
            av_dlog(s, "ES_ID %#x\n", *es_id);
872
            get_byte(&pb); /* priority */
873
            len = ff_mp4_read_descr(s, &pb, &tag);
874
            if (tag == MP4DecConfigDescrTag) {
875
                *dec_config_descr = av_malloc(len);
876
                if (!*dec_config_descr)
877
                    return AVERROR(ENOMEM);
878
                *dec_config_descr_size = len;
879
                get_buffer(&pb, *dec_config_descr, len);
880
            }
881
        }
882
    }
883
    return 0;
884
}
885

    
886
int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
887
                              const uint8_t **pp, const uint8_t *desc_list_end,
888
                              int mp4_dec_config_descr_len, int mp4_es_id, int pid,
889
                              uint8_t *mp4_dec_config_descr)
890
{
891
    const uint8_t *desc_end;
892
    int desc_len, desc_tag;
893
    char language[4];
894

    
895
    desc_tag = get8(pp, desc_list_end);
896
    if (desc_tag < 0)
897
        return -1;
898
    desc_len = get8(pp, desc_list_end);
899
    if (desc_len < 0)
900
        return -1;
901
    desc_end = *pp + desc_len;
902
    if (desc_end > desc_list_end)
903
        return -1;
904

    
905
    av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
906

    
907
    if (st->codec->codec_id == CODEC_ID_NONE &&
908
        stream_type == STREAM_TYPE_PRIVATE_DATA)
909
        mpegts_find_stream_type(st, desc_tag, DESC_types);
910

    
911
    switch(desc_tag) {
912
    case 0x1F: /* FMC descriptor */
913
        get16(pp, desc_end);
914
        if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
915
            mp4_dec_config_descr_len && mp4_es_id == pid) {
916
            ByteIOContext pb;
917
            init_put_byte(&pb, mp4_dec_config_descr,
918
                          mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
919
            ff_mp4_read_dec_config_descr(fc, st, &pb);
920
            if (st->codec->codec_id == CODEC_ID_AAC &&
921
                st->codec->extradata_size > 0)
922
                st->need_parsing = 0;
923
        }
924
        break;
925
    case 0x56: /* DVB teletext descriptor */
926
        language[0] = get8(pp, desc_end);
927
        language[1] = get8(pp, desc_end);
928
        language[2] = get8(pp, desc_end);
929
        language[3] = 0;
930
        av_metadata_set2(&st->metadata, "language", language, 0);
931
        break;
932
    case 0x59: /* subtitling descriptor */
933
        language[0] = get8(pp, desc_end);
934
        language[1] = get8(pp, desc_end);
935
        language[2] = get8(pp, desc_end);
936
        language[3] = 0;
937
        get8(pp, desc_end);
938
        if (st->codec->extradata) {
939
            if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
940
                av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
941
        } else {
942
            st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
943
            if (st->codec->extradata) {
944
                st->codec->extradata_size = 4;
945
                memcpy(st->codec->extradata, *pp, 4);
946
            }
947
        }
948
        *pp += 4;
949
        av_metadata_set2(&st->metadata, "language", language, 0);
950
        break;
951
    case 0x0a: /* ISO 639 language descriptor */
952
        language[0] = get8(pp, desc_end);
953
        language[1] = get8(pp, desc_end);
954
        language[2] = get8(pp, desc_end);
955
        language[3] = 0;
956
        av_metadata_set2(&st->metadata, "language", language, 0);
957
        switch (get8(pp, desc_end)) {
958
            case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
959
            case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
960
            case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
961
        }
962
        break;
963
    case 0x05: /* registration descriptor */
964
        st->codec->codec_tag = bytestream_get_le32(pp);
965
        av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
966
        if (st->codec->codec_id == CODEC_ID_NONE &&
967
            stream_type == STREAM_TYPE_PRIVATE_DATA)
968
            mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
969
        break;
970
    default:
971
        break;
972
    }
973
    *pp = desc_end;
974
    return 0;
975
}
976

    
977
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
978
{
979
    MpegTSContext *ts = filter->u.section_filter.opaque;
980
    SectionHeader h1, *h = &h1;
981
    PESContext *pes;
982
    AVStream *st;
983
    const uint8_t *p, *p_end, *desc_list_end;
984
    int program_info_length, pcr_pid, pid, stream_type;
985
    int desc_list_len;
986
    uint32_t prog_reg_desc = 0; /* registration descriptor */
987
    uint8_t *mp4_dec_config_descr = NULL;
988
    int mp4_dec_config_descr_len = 0;
989
    int mp4_es_id = 0;
990

    
991
#ifdef DEBUG
992
    av_dlog(ts->stream, "PMT: len %i\n", section_len);
993
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
994
#endif
995

    
996
    p_end = section + section_len - 4;
997
    p = section;
998
    if (parse_section_header(h, &p, p_end) < 0)
999
        return;
1000

    
1001
    av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1002
           h->id, h->sec_num, h->last_sec_num);
1003

    
1004
    if (h->tid != PMT_TID)
1005
        return;
1006

    
1007
    clear_program(ts, h->id);
1008
    pcr_pid = get16(&p, p_end) & 0x1fff;
1009
    if (pcr_pid < 0)
1010
        return;
1011
    add_pid_to_pmt(ts, h->id, pcr_pid);
1012

    
1013
    av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1014

    
1015
    program_info_length = get16(&p, p_end) & 0xfff;
1016
    if (program_info_length < 0)
1017
        return;
1018
    while(program_info_length >= 2) {
1019
        uint8_t tag, len;
1020
        tag = get8(&p, p_end);
1021
        len = get8(&p, p_end);
1022

    
1023
        av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1024

    
1025
        if(len > program_info_length - 2)
1026
            //something else is broken, exit the program_descriptors_loop
1027
            break;
1028
        program_info_length -= len + 2;
1029
        if (tag == 0x1d) { // IOD descriptor
1030
            get8(&p, p_end); // scope
1031
            get8(&p, p_end); // label
1032
            len -= 2;
1033
            mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1034
                          &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1035
        } else if (tag == 0x05 && len >= 4) { // registration descriptor
1036
            prog_reg_desc = bytestream_get_le32(&p);
1037
            len -= 4;
1038
        }
1039
        p += len;
1040
    }
1041
    p += program_info_length;
1042
    if (p >= p_end)
1043
        goto out;
1044

    
1045
    // stop parsing after pmt, we found header
1046
    if (!ts->stream->nb_streams)
1047
        ts->stop_parse = 1;
1048

    
1049
    for(;;) {
1050
        st = 0;
1051
        stream_type = get8(&p, p_end);
1052
        if (stream_type < 0)
1053
            break;
1054
        pid = get16(&p, p_end) & 0x1fff;
1055
        if (pid < 0)
1056
            break;
1057

    
1058
        /* now create ffmpeg stream */
1059
        if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1060
            pes = ts->pids[pid]->u.pes_filter.opaque;
1061
            if (!pes->st)
1062
                pes->st = av_new_stream(pes->stream, pes->pid);
1063
            st = pes->st;
1064
        } else {
1065
            if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1066
            pes = add_pes_stream(ts, pid, pcr_pid);
1067
            if (pes)
1068
                st = av_new_stream(pes->stream, pes->pid);
1069
        }
1070

    
1071
        if (!st)
1072
            goto out;
1073

    
1074
        if (!pes->stream_type)
1075
            mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1076

    
1077
        add_pid_to_pmt(ts, h->id, pid);
1078

    
1079
        ff_program_add_stream_index(ts->stream, h->id, st->index);
1080

    
1081
        desc_list_len = get16(&p, p_end) & 0xfff;
1082
        if (desc_list_len < 0)
1083
            break;
1084
        desc_list_end = p + desc_list_len;
1085
        if (desc_list_end > p_end)
1086
            break;
1087
        for(;;) {
1088
            if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1089
                mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1090
                break;
1091

    
1092
            if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1093
                ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1094
                pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1095
            }
1096
        }
1097
        p = desc_list_end;
1098
    }
1099

    
1100
 out:
1101
    av_free(mp4_dec_config_descr);
1102
}
1103

    
1104
static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1105
{
1106
    MpegTSContext *ts = filter->u.section_filter.opaque;
1107
    SectionHeader h1, *h = &h1;
1108
    const uint8_t *p, *p_end;
1109
    int sid, pmt_pid;
1110

    
1111
#ifdef DEBUG
1112
    av_dlog(ts->stream, "PAT:\n");
1113
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1114
#endif
1115
    p_end = section + section_len - 4;
1116
    p = section;
1117
    if (parse_section_header(h, &p, p_end) < 0)
1118
        return;
1119
    if (h->tid != PAT_TID)
1120
        return;
1121

    
1122
    clear_programs(ts);
1123
    for(;;) {
1124
        sid = get16(&p, p_end);
1125
        if (sid < 0)
1126
            break;
1127
        pmt_pid = get16(&p, p_end) & 0x1fff;
1128
        if (pmt_pid < 0)
1129
            break;
1130

    
1131
        av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1132

    
1133
        if (sid == 0x0000) {
1134
            /* NIT info */
1135
        } else {
1136
            av_new_program(ts->stream, sid);
1137
            if (ts->pids[pmt_pid])
1138
                mpegts_close_filter(ts, ts->pids[pmt_pid]);
1139
            mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1140
            add_pat_entry(ts, sid);
1141
            add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1142
            add_pid_to_pmt(ts, sid, pmt_pid);
1143
        }
1144
    }
1145
}
1146

    
1147
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1148
{
1149
    MpegTSContext *ts = filter->u.section_filter.opaque;
1150
    SectionHeader h1, *h = &h1;
1151
    const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1152
    int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1153
    char *name, *provider_name;
1154

    
1155
#ifdef DEBUG
1156
    av_dlog(ts->stream, "SDT:\n");
1157
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1158
#endif
1159

    
1160
    p_end = section + section_len - 4;
1161
    p = section;
1162
    if (parse_section_header(h, &p, p_end) < 0)
1163
        return;
1164
    if (h->tid != SDT_TID)
1165
        return;
1166
    onid = get16(&p, p_end);
1167
    if (onid < 0)
1168
        return;
1169
    val = get8(&p, p_end);
1170
    if (val < 0)
1171
        return;
1172
    for(;;) {
1173
        sid = get16(&p, p_end);
1174
        if (sid < 0)
1175
            break;
1176
        val = get8(&p, p_end);
1177
        if (val < 0)
1178
            break;
1179
        desc_list_len = get16(&p, p_end) & 0xfff;
1180
        if (desc_list_len < 0)
1181
            break;
1182
        desc_list_end = p + desc_list_len;
1183
        if (desc_list_end > p_end)
1184
            break;
1185
        for(;;) {
1186
            desc_tag = get8(&p, desc_list_end);
1187
            if (desc_tag < 0)
1188
                break;
1189
            desc_len = get8(&p, desc_list_end);
1190
            desc_end = p + desc_len;
1191
            if (desc_end > desc_list_end)
1192
                break;
1193

    
1194
            av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1195
                   desc_tag, desc_len);
1196

    
1197
            switch(desc_tag) {
1198
            case 0x48:
1199
                service_type = get8(&p, p_end);
1200
                if (service_type < 0)
1201
                    break;
1202
                provider_name = getstr8(&p, p_end);
1203
                if (!provider_name)
1204
                    break;
1205
                name = getstr8(&p, p_end);
1206
                if (name) {
1207
                    AVProgram *program = av_new_program(ts->stream, sid);
1208
                    if(program) {
1209
                        av_metadata_set2(&program->metadata, "service_name", name, 0);
1210
                        av_metadata_set2(&program->metadata, "service_provider", provider_name, 0);
1211
                    }
1212
                }
1213
                av_free(name);
1214
                av_free(provider_name);
1215
                break;
1216
            default:
1217
                break;
1218
            }
1219
            p = desc_end;
1220
        }
1221
        p = desc_list_end;
1222
    }
1223
}
1224

    
1225
/* handle one TS packet */
1226
static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1227
{
1228
    AVFormatContext *s = ts->stream;
1229
    MpegTSFilter *tss;
1230
    int len, pid, cc, cc_ok, afc, is_start;
1231
    const uint8_t *p, *p_end;
1232
    int64_t pos;
1233

    
1234
    pid = AV_RB16(packet + 1) & 0x1fff;
1235
    if(pid && discard_pid(ts, pid))
1236
        return 0;
1237
    is_start = packet[1] & 0x40;
1238
    tss = ts->pids[pid];
1239
    if (ts->auto_guess && tss == NULL && is_start) {
1240
        add_pes_stream(ts, pid, -1);
1241
        tss = ts->pids[pid];
1242
    }
1243
    if (!tss)
1244
        return 0;
1245

    
1246
    /* continuity check (currently not used) */
1247
    cc = (packet[3] & 0xf);
1248
    cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1249
    tss->last_cc = cc;
1250

    
1251
    /* skip adaptation field */
1252
    afc = (packet[3] >> 4) & 3;
1253
    p = packet + 4;
1254
    if (afc == 0) /* reserved value */
1255
        return 0;
1256
    if (afc == 2) /* adaptation field only */
1257
        return 0;
1258
    if (afc == 3) {
1259
        /* skip adapation field */
1260
        p += p[0] + 1;
1261
    }
1262
    /* if past the end of packet, ignore */
1263
    p_end = packet + TS_PACKET_SIZE;
1264
    if (p >= p_end)
1265
        return 0;
1266

    
1267
    pos = url_ftell(ts->stream->pb);
1268
    ts->pos47= pos % ts->raw_packet_size;
1269

    
1270
    if (tss->type == MPEGTS_SECTION) {
1271
        if (is_start) {
1272
            /* pointer field present */
1273
            len = *p++;
1274
            if (p + len > p_end)
1275
                return 0;
1276
            if (len && cc_ok) {
1277
                /* write remaining section bytes */
1278
                write_section_data(s, tss,
1279
                                   p, len, 0);
1280
                /* check whether filter has been closed */
1281
                if (!ts->pids[pid])
1282
                    return 0;
1283
            }
1284
            p += len;
1285
            if (p < p_end) {
1286
                write_section_data(s, tss,
1287
                                   p, p_end - p, 1);
1288
            }
1289
        } else {
1290
            if (cc_ok) {
1291
                write_section_data(s, tss,
1292
                                   p, p_end - p, 0);
1293
            }
1294
        }
1295
    } else {
1296
        int ret;
1297
        // Note: The position here points actually behind the current packet.
1298
        if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1299
                                            pos - ts->raw_packet_size)) < 0)
1300
            return ret;
1301
    }
1302

    
1303
    return 0;
1304
}
1305

    
1306
/* XXX: try to find a better synchro over several packets (use
1307
   get_packet_size() ?) */
1308
static int mpegts_resync(AVFormatContext *s)
1309
{
1310
    ByteIOContext *pb = s->pb;
1311
    int c, i;
1312

    
1313
    for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1314
        c = url_fgetc(pb);
1315
        if (c < 0)
1316
            return -1;
1317
        if (c == 0x47) {
1318
            url_fseek(pb, -1, SEEK_CUR);
1319
            return 0;
1320
        }
1321
    }
1322
    av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1323
    /* no sync found */
1324
    return -1;
1325
}
1326

    
1327
/* return -1 if error or EOF. Return 0 if OK. */
1328
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1329
{
1330
    ByteIOContext *pb = s->pb;
1331
    int skip, len;
1332

    
1333
    for(;;) {
1334
        len = get_buffer(pb, buf, TS_PACKET_SIZE);
1335
        if (len != TS_PACKET_SIZE)
1336
            return AVERROR(EIO);
1337
        /* check paquet sync byte */
1338
        if (buf[0] != 0x47) {
1339
            /* find a new packet start */
1340
            url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1341
            if (mpegts_resync(s) < 0)
1342
                return AVERROR(EAGAIN);
1343
            else
1344
                continue;
1345
        } else {
1346
            skip = raw_packet_size - TS_PACKET_SIZE;
1347
            if (skip > 0)
1348
                url_fskip(pb, skip);
1349
            break;
1350
        }
1351
    }
1352
    return 0;
1353
}
1354

    
1355
static int handle_packets(MpegTSContext *ts, int nb_packets)
1356
{
1357
    AVFormatContext *s = ts->stream;
1358
    uint8_t packet[TS_PACKET_SIZE];
1359
    int packet_num, ret;
1360

    
1361
    ts->stop_parse = 0;
1362
    packet_num = 0;
1363
    for(;;) {
1364
        if (ts->stop_parse>0)
1365
            break;
1366
        packet_num++;
1367
        if (nb_packets != 0 && packet_num >= nb_packets)
1368
            break;
1369
        ret = read_packet(s, packet, ts->raw_packet_size);
1370
        if (ret != 0)
1371
            return ret;
1372
        ret = handle_packet(ts, packet);
1373
        if (ret != 0)
1374
            return ret;
1375
    }
1376
    return 0;
1377
}
1378

    
1379
static int mpegts_probe(AVProbeData *p)
1380
{
1381
#if 1
1382
    const int size= p->buf_size;
1383
    int score, fec_score, dvhs_score;
1384
    int check_count= size / TS_FEC_PACKET_SIZE;
1385
#define CHECK_COUNT 10
1386

    
1387
    if (check_count < CHECK_COUNT)
1388
        return -1;
1389

    
1390
    score     = analyze(p->buf, TS_PACKET_SIZE     *check_count, TS_PACKET_SIZE     , NULL)*CHECK_COUNT/check_count;
1391
    dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1392
    fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1393
//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1394

    
1395
// we need a clear definition for the returned score otherwise things will become messy sooner or later
1396
    if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
1397
    else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
1398
    else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1399
    else                                    return -1;
1400
#else
1401
    /* only use the extension for safer guess */
1402
    if (av_match_ext(p->filename, "ts"))
1403
        return AVPROBE_SCORE_MAX;
1404
    else
1405
        return 0;
1406
#endif
1407
}
1408

    
1409
/* return the 90kHz PCR and the extension for the 27MHz PCR. return
1410
   (-1) if not available */
1411
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1412
                     const uint8_t *packet)
1413
{
1414
    int afc, len, flags;
1415
    const uint8_t *p;
1416
    unsigned int v;
1417

    
1418
    afc = (packet[3] >> 4) & 3;
1419
    if (afc <= 1)
1420
        return -1;
1421
    p = packet + 4;
1422
    len = p[0];
1423
    p++;
1424
    if (len == 0)
1425
        return -1;
1426
    flags = *p++;
1427
    len--;
1428
    if (!(flags & 0x10))
1429
        return -1;
1430
    if (len < 6)
1431
        return -1;
1432
    v = AV_RB32(p);
1433
    *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1434
    *ppcr_low = ((p[4] & 1) << 8) | p[5];
1435
    return 0;
1436
}
1437

    
1438
static int mpegts_read_header(AVFormatContext *s,
1439
                              AVFormatParameters *ap)
1440
{
1441
    MpegTSContext *ts = s->priv_data;
1442
    ByteIOContext *pb = s->pb;
1443
    uint8_t buf[5*1024];
1444
    int len;
1445
    int64_t pos;
1446

    
1447
    if (ap) {
1448
        ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1449
        if(ap->mpeg2ts_raw){
1450
            av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1451
            return -1;
1452
        }
1453
    }
1454

    
1455
    /* read the first 1024 bytes to get packet size */
1456
    pos = url_ftell(pb);
1457
    len = get_buffer(pb, buf, sizeof(buf));
1458
    if (len != sizeof(buf))
1459
        goto fail;
1460
    ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1461
    if (ts->raw_packet_size <= 0)
1462
        goto fail;
1463
    ts->stream = s;
1464
    ts->auto_guess = 0;
1465

    
1466
    if (s->iformat == &ff_mpegts_demuxer) {
1467
        /* normal demux */
1468

    
1469
        /* first do a scaning to get all the services */
1470
        if (url_fseek(pb, pos, SEEK_SET) < 0)
1471
            av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1472

    
1473
        mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1474

    
1475
        mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1476

    
1477
        handle_packets(ts, s->probesize / ts->raw_packet_size);
1478
        /* if could not find service, enable auto_guess */
1479

    
1480
        ts->auto_guess = 1;
1481

    
1482
        av_dlog(ts->stream, "tuning done\n");
1483

    
1484
        s->ctx_flags |= AVFMTCTX_NOHEADER;
1485
    } else {
1486
        AVStream *st;
1487
        int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1488
        int64_t pcrs[2], pcr_h;
1489
        int packet_count[2];
1490
        uint8_t packet[TS_PACKET_SIZE];
1491

    
1492
        /* only read packets */
1493

    
1494
        st = av_new_stream(s, 0);
1495
        if (!st)
1496
            goto fail;
1497
        av_set_pts_info(st, 60, 1, 27000000);
1498
        st->codec->codec_type = AVMEDIA_TYPE_DATA;
1499
        st->codec->codec_id = CODEC_ID_MPEG2TS;
1500

    
1501
        /* we iterate until we find two PCRs to estimate the bitrate */
1502
        pcr_pid = -1;
1503
        nb_pcrs = 0;
1504
        nb_packets = 0;
1505
        for(;;) {
1506
            ret = read_packet(s, packet, ts->raw_packet_size);
1507
            if (ret < 0)
1508
                return -1;
1509
            pid = AV_RB16(packet + 1) & 0x1fff;
1510
            if ((pcr_pid == -1 || pcr_pid == pid) &&
1511
                parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1512
                pcr_pid = pid;
1513
                packet_count[nb_pcrs] = nb_packets;
1514
                pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1515
                nb_pcrs++;
1516
                if (nb_pcrs >= 2)
1517
                    break;
1518
            }
1519
            nb_packets++;
1520
        }
1521

    
1522
        /* NOTE1: the bitrate is computed without the FEC */
1523
        /* NOTE2: it is only the bitrate of the start of the stream */
1524
        ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1525
        ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1526
        s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1527
        st->codec->bit_rate = s->bit_rate;
1528
        st->start_time = ts->cur_pcr;
1529
#if 0
1530
        av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1531
               st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1532
#endif
1533
    }
1534

    
1535
    url_fseek(pb, pos, SEEK_SET);
1536
    return 0;
1537
 fail:
1538
    return -1;
1539
}
1540

    
1541
#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1542

    
1543
static int mpegts_raw_read_packet(AVFormatContext *s,
1544
                                  AVPacket *pkt)
1545
{
1546
    MpegTSContext *ts = s->priv_data;
1547
    int ret, i;
1548
    int64_t pcr_h, next_pcr_h, pos;
1549
    int pcr_l, next_pcr_l;
1550
    uint8_t pcr_buf[12];
1551

    
1552
    if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1553
        return AVERROR(ENOMEM);
1554
    pkt->pos= url_ftell(s->pb);
1555
    ret = read_packet(s, pkt->data, ts->raw_packet_size);
1556
    if (ret < 0) {
1557
        av_free_packet(pkt);
1558
        return ret;
1559
    }
1560
    if (ts->mpeg2ts_compute_pcr) {
1561
        /* compute exact PCR for each packet */
1562
        if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1563
            /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1564
            pos = url_ftell(s->pb);
1565
            for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1566
                url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1567
                get_buffer(s->pb, pcr_buf, 12);
1568
                if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1569
                    /* XXX: not precise enough */
1570
                    ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1571
                        (i + 1);
1572
                    break;
1573
                }
1574
            }
1575
            url_fseek(s->pb, pos, SEEK_SET);
1576
            /* no next PCR found: we use previous increment */
1577
            ts->cur_pcr = pcr_h * 300 + pcr_l;
1578
        }
1579
        pkt->pts = ts->cur_pcr;
1580
        pkt->duration = ts->pcr_incr;
1581
        ts->cur_pcr += ts->pcr_incr;
1582
    }
1583
    pkt->stream_index = 0;
1584
    return 0;
1585
}
1586

    
1587
static int mpegts_read_packet(AVFormatContext *s,
1588
                              AVPacket *pkt)
1589
{
1590
    MpegTSContext *ts = s->priv_data;
1591
    int ret, i;
1592

    
1593
    if (url_ftell(s->pb) != ts->last_pos) {
1594
        /* seek detected, flush pes buffer */
1595
        for (i = 0; i < NB_PID_MAX; i++) {
1596
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1597
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1598
                av_freep(&pes->buffer);
1599
                pes->data_index = 0;
1600
                pes->state = MPEGTS_SKIP; /* skip until pes header */
1601
            }
1602
        }
1603
    }
1604

    
1605
    ts->pkt = pkt;
1606
    ret = handle_packets(ts, 0);
1607
    if (ret < 0) {
1608
        /* flush pes data left */
1609
        for (i = 0; i < NB_PID_MAX; i++) {
1610
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1611
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1612
                if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1613
                    new_pes_packet(pes, pkt);
1614
                    pes->state = MPEGTS_SKIP;
1615
                    ret = 0;
1616
                    break;
1617
                }
1618
            }
1619
        }
1620
    }
1621

    
1622
    ts->last_pos = url_ftell(s->pb);
1623

    
1624
    return ret;
1625
}
1626

    
1627
static int mpegts_read_close(AVFormatContext *s)
1628
{
1629
    MpegTSContext *ts = s->priv_data;
1630
    int i;
1631

    
1632
    clear_programs(ts);
1633

    
1634
    for(i=0;i<NB_PID_MAX;i++)
1635
        if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1636

    
1637
    return 0;
1638
}
1639

    
1640
static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1641
                              int64_t *ppos, int64_t pos_limit)
1642
{
1643
    MpegTSContext *ts = s->priv_data;
1644
    int64_t pos, timestamp;
1645
    uint8_t buf[TS_PACKET_SIZE];
1646
    int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1647
    const int find_next= 1;
1648
    pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1649
    if (find_next) {
1650
        for(;;) {
1651
            url_fseek(s->pb, pos, SEEK_SET);
1652
            if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1653
                return AV_NOPTS_VALUE;
1654
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1655
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1656
                break;
1657
            }
1658
            pos += ts->raw_packet_size;
1659
        }
1660
    } else {
1661
        for(;;) {
1662
            pos -= ts->raw_packet_size;
1663
            if (pos < 0)
1664
                return AV_NOPTS_VALUE;
1665
            url_fseek(s->pb, pos, SEEK_SET);
1666
            if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1667
                return AV_NOPTS_VALUE;
1668
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1669
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1670
                break;
1671
            }
1672
        }
1673
    }
1674
    *ppos = pos;
1675

    
1676
    return timestamp;
1677
}
1678

    
1679
#ifdef USE_SYNCPOINT_SEARCH
1680

    
1681
static int read_seek2(AVFormatContext *s,
1682
                      int stream_index,
1683
                      int64_t min_ts,
1684
                      int64_t target_ts,
1685
                      int64_t max_ts,
1686
                      int flags)
1687
{
1688
    int64_t pos;
1689

    
1690
    int64_t ts_ret, ts_adj;
1691
    int stream_index_gen_search;
1692
    AVStream *st;
1693
    AVParserState *backup;
1694

    
1695
    backup = ff_store_parser_state(s);
1696

    
1697
    // detect direction of seeking for search purposes
1698
    flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1699
             AVSEEK_FLAG_BACKWARD : 0;
1700

    
1701
    if (flags & AVSEEK_FLAG_BYTE) {
1702
        // use position directly, we will search starting from it
1703
        pos = target_ts;
1704
    } else {
1705
        // search for some position with good timestamp match
1706
        if (stream_index < 0) {
1707
            stream_index_gen_search = av_find_default_stream_index(s);
1708
            if (stream_index_gen_search < 0) {
1709
                ff_restore_parser_state(s, backup);
1710
                return -1;
1711
            }
1712

    
1713
            st = s->streams[stream_index_gen_search];
1714
            // timestamp for default must be expressed in AV_TIME_BASE units
1715
            ts_adj = av_rescale(target_ts,
1716
                                st->time_base.den,
1717
                                AV_TIME_BASE * (int64_t)st->time_base.num);
1718
        } else {
1719
            ts_adj = target_ts;
1720
            stream_index_gen_search = stream_index;
1721
        }
1722
        pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1723
                            0, INT64_MAX, -1,
1724
                            AV_NOPTS_VALUE,
1725
                            AV_NOPTS_VALUE,
1726
                            flags, &ts_ret, mpegts_get_pcr);
1727
        if (pos < 0) {
1728
            ff_restore_parser_state(s, backup);
1729
            return -1;
1730
        }
1731
    }
1732

    
1733
    // search for actual matching keyframe/starting position for all streams
1734
    if (ff_gen_syncpoint_search(s, stream_index, pos,
1735
                                min_ts, target_ts, max_ts,
1736
                                flags) < 0) {
1737
        ff_restore_parser_state(s, backup);
1738
        return -1;
1739
    }
1740

    
1741
    ff_free_parser_state(s, backup);
1742
    return 0;
1743
}
1744

    
1745
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1746
{
1747
    int ret;
1748
    if (flags & AVSEEK_FLAG_BACKWARD) {
1749
        flags &= ~AVSEEK_FLAG_BACKWARD;
1750
        ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1751
        if (ret < 0)
1752
            // for compatibility reasons, seek to the best-fitting timestamp
1753
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1754
    } else {
1755
        ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1756
        if (ret < 0)
1757
            // for compatibility reasons, seek to the best-fitting timestamp
1758
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1759
    }
1760
    return ret;
1761
}
1762

    
1763
#else
1764

    
1765
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1766
    MpegTSContext *ts = s->priv_data;
1767
    uint8_t buf[TS_PACKET_SIZE];
1768
    int64_t pos;
1769

    
1770
    if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1771
        return -1;
1772

    
1773
    pos= url_ftell(s->pb);
1774

    
1775
    for(;;) {
1776
        url_fseek(s->pb, pos, SEEK_SET);
1777
        if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1778
            return -1;
1779
//        pid = AV_RB16(buf + 1) & 0x1fff;
1780
        if(buf[1] & 0x40) break;
1781
        pos += ts->raw_packet_size;
1782
    }
1783
    url_fseek(s->pb, pos, SEEK_SET);
1784

    
1785
    return 0;
1786
}
1787

    
1788
#endif
1789

    
1790
/**************************************************************/
1791
/* parsing functions - called from other demuxers such as RTP */
1792

    
1793
MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1794
{
1795
    MpegTSContext *ts;
1796

    
1797
    ts = av_mallocz(sizeof(MpegTSContext));
1798
    if (!ts)
1799
        return NULL;
1800
    /* no stream case, currently used by RTP */
1801
    ts->raw_packet_size = TS_PACKET_SIZE;
1802
    ts->stream = s;
1803
    ts->auto_guess = 1;
1804
    return ts;
1805
}
1806

    
1807
/* return the consumed length if a packet was output, or -1 if no
1808
   packet is output */
1809
int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1810
                        const uint8_t *buf, int len)
1811
{
1812
    int len1;
1813

    
1814
    len1 = len;
1815
    ts->pkt = pkt;
1816
    ts->stop_parse = 0;
1817
    for(;;) {
1818
        if (ts->stop_parse>0)
1819
            break;
1820
        if (len < TS_PACKET_SIZE)
1821
            return -1;
1822
        if (buf[0] != 0x47) {
1823
            buf++;
1824
            len--;
1825
        } else {
1826
            handle_packet(ts, buf);
1827
            buf += TS_PACKET_SIZE;
1828
            len -= TS_PACKET_SIZE;
1829
        }
1830
    }
1831
    return len1 - len;
1832
}
1833

    
1834
void ff_mpegts_parse_close(MpegTSContext *ts)
1835
{
1836
    int i;
1837

    
1838
    for(i=0;i<NB_PID_MAX;i++)
1839
        av_free(ts->pids[i]);
1840
    av_free(ts);
1841
}
1842

    
1843
AVInputFormat ff_mpegts_demuxer = {
1844
    "mpegts",
1845
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1846
    sizeof(MpegTSContext),
1847
    mpegts_probe,
1848
    mpegts_read_header,
1849
    mpegts_read_packet,
1850
    mpegts_read_close,
1851
    read_seek,
1852
    mpegts_get_pcr,
1853
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1854
#ifdef USE_SYNCPOINT_SEARCH
1855
    .read_seek2 = read_seek2,
1856
#endif
1857
};
1858

    
1859
AVInputFormat ff_mpegtsraw_demuxer = {
1860
    "mpegtsraw",
1861
    NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1862
    sizeof(MpegTSContext),
1863
    NULL,
1864
    mpegts_read_header,
1865
    mpegts_raw_read_packet,
1866
    mpegts_read_close,
1867
    read_seek,
1868
    mpegts_get_pcr,
1869
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1870
#ifdef USE_SYNCPOINT_SEARCH
1871
    .read_seek2 = read_seek2,
1872
#endif
1873
};