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ffmpeg / libavformat / mpegts.c @ 40b0872a

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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
 *
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
 *
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 * 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

    
25
#include "libavutil/crc.h"
26
#include "libavutil/intreadwrite.h"
27
#include "libavcodec/bytestream.h"
28
#include "avformat.h"
29
#include "mpegts.h"
30
#include "internal.h"
31

    
32
/* 1.0 second at 24Mbit/s */
33
#define MAX_SCAN_PACKETS 32000
34

    
35
/* maximum size in which we look for synchronisation if
36
   synchronisation is lost */
37
#define MAX_RESYNC_SIZE 4096
38
#define REGISTRATION_DESCRIPTOR 5
39

    
40
#define MAX_PES_PAYLOAD 200*1024
41

    
42
typedef struct PESContext PESContext;
43

    
44
static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
45
static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
46

    
47
enum MpegTSFilterType {
48
    MPEGTS_PES,
49
    MPEGTS_SECTION,
50
};
51

    
52
typedef struct MpegTSFilter MpegTSFilter;
53

    
54
typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
55

    
56
typedef struct MpegTSPESFilter {
57
    PESCallback *pes_cb;
58
    void *opaque;
59
} MpegTSPESFilter;
60

    
61
typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
62

    
63
typedef void SetServiceCallback(void *opaque, int ret);
64

    
65
typedef struct MpegTSSectionFilter {
66
    int section_index;
67
    int section_h_size;
68
    uint8_t *section_buf;
69
    unsigned int check_crc:1;
70
    unsigned int end_of_section_reached:1;
71
    SectionCallback *section_cb;
72
    void *opaque;
73
} MpegTSSectionFilter;
74

    
75
struct MpegTSFilter {
76
    int pid;
77
    int last_cc; /* last cc code (-1 if first packet) */
78
    enum MpegTSFilterType type;
79
    union {
80
        MpegTSPESFilter pes_filter;
81
        MpegTSSectionFilter section_filter;
82
    } u;
83
};
84

    
85
#define MAX_PIDS_PER_PROGRAM 64
86
struct Program {
87
    unsigned int id; //program id/service id
88
    unsigned int nb_pids;
89
    unsigned int pids[MAX_PIDS_PER_PROGRAM];
90
};
91

    
92
struct MpegTSContext {
93
    /* user data */
94
    AVFormatContext *stream;
95
    /** raw packet size, including FEC if present            */
96
    int raw_packet_size;
97

    
98
    int pos47;
99

    
100
    /** if true, all pids are analyzed to find streams       */
101
    int auto_guess;
102

    
103
    /** compute exact PCR for each transport stream packet   */
104
    int mpeg2ts_compute_pcr;
105

    
106
    int64_t cur_pcr;    /**< used to estimate the exact PCR  */
107
    int pcr_incr;       /**< used to estimate the exact PCR  */
108

    
109
    /* data needed to handle file based ts */
110
    /** stop parsing loop                                    */
111
    int stop_parse;
112
    /** packet containing Audio/Video data                   */
113
    AVPacket *pkt;
114
    /** to detect seek                                       */
115
    int64_t last_pos;
116

    
117
    /******************************************/
118
    /* private mpegts data */
119
    /* scan context */
120
    /** structure to keep track of Program->pids mapping     */
121
    unsigned int nb_prg;
122
    struct Program *prg;
123

    
124

    
125
    /** filters for various streams specified by PMT + for the PAT and PMT */
126
    MpegTSFilter *pids[NB_PID_MAX];
127
};
128

    
129
/* TS stream handling */
130

    
131
enum MpegTSState {
132
    MPEGTS_HEADER = 0,
133
    MPEGTS_PESHEADER_FILL,
134
    MPEGTS_PAYLOAD,
135
    MPEGTS_SKIP,
136
};
137

    
138
/* enough for PES header + length */
139
#define PES_START_SIZE 9
140
#define MAX_PES_HEADER_SIZE (9 + 255)
141

    
142
struct PESContext {
143
    int pid;
144
    int pcr_pid; /**< if -1 then all packets containing PCR are considered */
145
    int stream_type;
146
    MpegTSContext *ts;
147
    AVFormatContext *stream;
148
    AVStream *st;
149
    enum MpegTSState state;
150
    /* used to get the format */
151
    int data_index;
152
    int total_size;
153
    int pes_header_size;
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
};
159

    
160
extern AVInputFormat 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
 *  Assembles PES packets out of TS packets, and then calls 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
    dprintf(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[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

    
488
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
489
{
490
    MpegTSContext *ts = filter->u.section_filter.opaque;
491
    SectionHeader h1, *h = &h1;
492
    PESContext *pes;
493
    AVStream *st;
494
    const uint8_t *p, *p_end, *desc_list_end, *desc_end;
495
    int program_info_length, pcr_pid, pid, stream_type;
496
    int desc_list_len, desc_len, desc_tag;
497
    int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
498
    char language[4] = {0}; /* initialize to kill warnings */
499
    int has_hdmv_descr = 0;
500
    int has_dirac_descr = 0;
501
    uint32_t reg_desc = 0; /* registration descriptor */
502

    
503
#ifdef DEBUG
504
    dprintf(ts->stream, "PMT: len %i\n", section_len);
505
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
506
#endif
507

    
508
    p_end = section + section_len - 4;
509
    p = section;
510
    if (parse_section_header(h, &p, p_end) < 0)
511
        return;
512

    
513
    dprintf(ts->stream, "sid=0x%x sec_num=%d/%d\n",
514
           h->id, h->sec_num, h->last_sec_num);
515

    
516
    if (h->tid != PMT_TID)
517
        return;
518

    
519
    clear_program(ts, h->id);
520
    pcr_pid = get16(&p, p_end) & 0x1fff;
521
    if (pcr_pid < 0)
522
        return;
523
    add_pid_to_pmt(ts, h->id, pcr_pid);
524

    
525
    dprintf(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
526

    
527
    program_info_length = get16(&p, p_end) & 0xfff;
528
    if (program_info_length < 0)
529
        return;
530
    while(program_info_length >= 2) {
531
        uint8_t tag, len;
532
        tag = get8(&p, p_end);
533
        len = get8(&p, p_end);
534
        if(len > program_info_length - 2)
535
            //something else is broken, exit the program_descriptors_loop
536
            break;
537
        program_info_length -= len + 2;
538
        if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
539
            reg_desc = bytestream_get_le32(&p);
540
            len -= 4;
541
            if(reg_desc == AV_RL32("HDMV"))
542
                has_hdmv_descr = 1;
543
        }
544
        p += len;
545
    }
546
    p += program_info_length;
547
    if (p >= p_end)
548
        return;
549
    for(;;) {
550
        language[0] = 0;
551
        st = 0;
552
        stream_type = get8(&p, p_end);
553
        if (stream_type < 0)
554
            break;
555
        pid = get16(&p, p_end) & 0x1fff;
556
        if (pid < 0)
557
            break;
558
        desc_list_len = get16(&p, p_end) & 0xfff;
559
        if (desc_list_len < 0)
560
            break;
561
        desc_list_end = p + desc_list_len;
562
        if (desc_list_end > p_end)
563
            break;
564
        for(;;) {
565
            desc_tag = get8(&p, desc_list_end);
566
            if (desc_tag < 0)
567
                break;
568
            if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
569
                if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
570
                    /*assume DVB AC-3 Audio*/
571
                    stream_type = STREAM_TYPE_AUDIO_AC3;
572
                } else if(desc_tag == 0x7B) {
573
                    /* DVB DTS audio */
574
                    stream_type = STREAM_TYPE_AUDIO_DTS;
575
                }
576
            }
577
            desc_len = get8(&p, desc_list_end);
578
            if (desc_len < 0)
579
                break;
580
            desc_end = p + desc_len;
581
            if (desc_end > desc_list_end)
582
                break;
583

    
584
            dprintf(ts->stream, "tag: 0x%02x len=%d\n",
585
                   desc_tag, desc_len);
586

    
587
            switch(desc_tag) {
588
            case DVB_SUBT_DESCID:
589
                if (stream_type == STREAM_TYPE_PRIVATE_DATA)
590
                    stream_type = STREAM_TYPE_SUBTITLE_DVB;
591

    
592
                language[0] = get8(&p, desc_end);
593
                language[1] = get8(&p, desc_end);
594
                language[2] = get8(&p, desc_end);
595
                language[3] = 0;
596
                get8(&p, desc_end);
597
                comp_page = get16(&p, desc_end);
598
                anc_page = get16(&p, desc_end);
599

    
600
                break;
601
            case 0x0a: /* ISO 639 language descriptor */
602
                language[0] = get8(&p, desc_end);
603
                language[1] = get8(&p, desc_end);
604
                language[2] = get8(&p, desc_end);
605
                language[3] = 0;
606
                break;
607
            case REGISTRATION_DESCRIPTOR: /*MPEG-2 Registration descriptor */
608
                reg_desc = bytestream_get_le32(&p);
609
                if(reg_desc == AV_RL32("drac"))
610
                    has_dirac_descr = 1;
611
                else if(reg_desc == AV_RL32("AC-3"))
612
                    stream_type = STREAM_TYPE_AUDIO_AC3;
613
                break;
614
            default:
615
                break;
616
            }
617
            p = desc_end;
618
        }
619
        p = desc_list_end;
620

    
621
        dprintf(ts->stream, "stream_type=%x pid=0x%x\n",
622
               stream_type, pid);
623

    
624
        /* now create ffmpeg stream */
625
        if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
626
            pes= ts->pids[pid]->u.pes_filter.opaque;
627
            st= pes->st;
628
        } else {
629
            if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
630
            pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
631
            if (pes)
632
                st = new_pes_av_stream(pes, 0);
633
        }
634

    
635
        add_pid_to_pmt(ts, h->id, pid);
636

    
637
        if(st) {
638
            av_program_add_stream_index(ts->stream, h->id, st->index);
639

    
640
            if (language[0] != 0)
641
                av_metadata_set(&st->metadata, "language", language);
642

    
643
            if (stream_type == STREAM_TYPE_SUBTITLE_DVB)
644
                st->codec->sub_id = (anc_page << 16) | comp_page;
645
        }
646
    }
647
    /* all parameters are there */
648
    ts->stop_parse++;
649
    mpegts_close_filter(ts, filter);
650
}
651

    
652
static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
653
{
654
    MpegTSContext *ts = filter->u.section_filter.opaque;
655
    SectionHeader h1, *h = &h1;
656
    const uint8_t *p, *p_end;
657
    int sid, pmt_pid;
658

    
659
#ifdef DEBUG
660
    dprintf(ts->stream, "PAT:\n");
661
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
662
#endif
663
    p_end = section + section_len - 4;
664
    p = section;
665
    if (parse_section_header(h, &p, p_end) < 0)
666
        return;
667
    if (h->tid != PAT_TID)
668
        return;
669

    
670
    clear_programs(ts);
671
    for(;;) {
672
        sid = get16(&p, p_end);
673
        if (sid < 0)
674
            break;
675
        pmt_pid = get16(&p, p_end) & 0x1fff;
676
        if (pmt_pid < 0)
677
            break;
678

    
679
        dprintf(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
680

    
681
        if (sid == 0x0000) {
682
            /* NIT info */
683
        } else {
684
            av_new_program(ts->stream, sid);
685
            ts->stop_parse--;
686
            mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
687
            add_pat_entry(ts, sid);
688
            add_pid_to_pmt(ts, sid, 0); //add pat pid to program
689
            add_pid_to_pmt(ts, sid, pmt_pid);
690
        }
691
    }
692
    /* not found */
693
    ts->stop_parse++;
694

    
695
    mpegts_close_filter(ts, filter);
696
}
697

    
698
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
699
{
700
    MpegTSContext *ts = filter->u.section_filter.opaque;
701
    SectionHeader h1, *h = &h1;
702
    const uint8_t *p, *p_end, *desc_list_end, *desc_end;
703
    int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
704
    char *name, *provider_name;
705

    
706
#ifdef DEBUG
707
    dprintf(ts->stream, "SDT:\n");
708
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
709
#endif
710

    
711
    p_end = section + section_len - 4;
712
    p = section;
713
    if (parse_section_header(h, &p, p_end) < 0)
714
        return;
715
    if (h->tid != SDT_TID)
716
        return;
717
    onid = get16(&p, p_end);
718
    if (onid < 0)
719
        return;
720
    val = get8(&p, p_end);
721
    if (val < 0)
722
        return;
723
    for(;;) {
724
        sid = get16(&p, p_end);
725
        if (sid < 0)
726
            break;
727
        val = get8(&p, p_end);
728
        if (val < 0)
729
            break;
730
        desc_list_len = get16(&p, p_end) & 0xfff;
731
        if (desc_list_len < 0)
732
            break;
733
        desc_list_end = p + desc_list_len;
734
        if (desc_list_end > p_end)
735
            break;
736
        for(;;) {
737
            desc_tag = get8(&p, desc_list_end);
738
            if (desc_tag < 0)
739
                break;
740
            desc_len = get8(&p, desc_list_end);
741
            desc_end = p + desc_len;
742
            if (desc_end > desc_list_end)
743
                break;
744

    
745
            dprintf(ts->stream, "tag: 0x%02x len=%d\n",
746
                   desc_tag, desc_len);
747

    
748
            switch(desc_tag) {
749
            case 0x48:
750
                service_type = get8(&p, p_end);
751
                if (service_type < 0)
752
                    break;
753
                provider_name = getstr8(&p, p_end);
754
                if (!provider_name)
755
                    break;
756
                name = getstr8(&p, p_end);
757
                if (name) {
758
                    AVProgram *program = av_new_program(ts->stream, sid);
759
                    if(program) {
760
                        av_metadata_set(&program->metadata, "name", name);
761
                        av_metadata_set(&program->metadata, "provider_name", provider_name);
762
                    }
763
                }
764
                av_free(name);
765
                av_free(provider_name);
766
                break;
767
            default:
768
                break;
769
            }
770
            p = desc_end;
771
        }
772
        p = desc_list_end;
773
    }
774
}
775

    
776
static int64_t get_pts(const uint8_t *p)
777
{
778
    int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
779
    pts |= (AV_RB16(p + 1) >> 1) << 15;
780
    pts |=  AV_RB16(p + 3) >> 1;
781
    return pts;
782
}
783

    
784
static void new_pes_packet(PESContext *pes, AVPacket *pkt)
785
{
786
    av_init_packet(pkt);
787

    
788
    pkt->destruct = av_destruct_packet;
789
    pkt->data = pes->buffer;
790
    pkt->size = pes->data_index;
791
    memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
792

    
793
    pkt->stream_index = pes->st->index;
794
    pkt->pts = pes->pts;
795
    pkt->dts = pes->dts;
796
    /* store position of first TS packet of this PES packet */
797
    pkt->pos = pes->ts_packet_pos;
798

    
799
    /* reset pts values */
800
    pes->pts = AV_NOPTS_VALUE;
801
    pes->dts = AV_NOPTS_VALUE;
802
    pes->buffer = NULL;
803
    pes->data_index = 0;
804
}
805

    
806
/* return non zero if a packet could be constructed */
807
static int mpegts_push_data(MpegTSFilter *filter,
808
                            const uint8_t *buf, int buf_size, int is_start,
809
                            int64_t pos)
810
{
811
    PESContext *pes = filter->u.pes_filter.opaque;
812
    MpegTSContext *ts = pes->ts;
813
    const uint8_t *p;
814
    int len, code;
815

    
816
    if(!ts->pkt)
817
        return 0;
818

    
819
    if (is_start) {
820
        if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
821
            new_pes_packet(pes, ts->pkt);
822
            ts->stop_parse = 1;
823
        }
824
        pes->state = MPEGTS_HEADER;
825
        pes->data_index = 0;
826
        pes->ts_packet_pos = pos;
827
    }
828
    p = buf;
829
    while (buf_size > 0) {
830
        switch(pes->state) {
831
        case MPEGTS_HEADER:
832
            len = PES_START_SIZE - pes->data_index;
833
            if (len > buf_size)
834
                len = buf_size;
835
            memcpy(pes->header + pes->data_index, p, len);
836
            pes->data_index += len;
837
            p += len;
838
            buf_size -= len;
839
            if (pes->data_index == PES_START_SIZE) {
840
                /* we got all the PES or section header. We can now
841
                   decide */
842
#if 0
843
                av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
844
#endif
845
                if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
846
                    pes->header[2] == 0x01) {
847
                    /* it must be an mpeg2 PES stream */
848
                    code = pes->header[3] | 0x100;
849
                    if (!pes->st || pes->st->discard == AVDISCARD_ALL ||
850
                        !((code >= 0x1c0 && code <= 0x1df) ||
851
                          (code >= 0x1e0 && code <= 0x1ef) ||
852
                          (code == 0x1bd) || (code == 0x1fd)))
853
                        goto skip;
854
                    pes->state = MPEGTS_PESHEADER_FILL;
855
                    pes->total_size = AV_RB16(pes->header + 4);
856
                    /* NOTE: a zero total size means the PES size is
857
                       unbounded */
858
                    pes->pes_header_size = pes->header[8] + 9;
859
                } else {
860
                    /* otherwise, it should be a table */
861
                    /* skip packet */
862
                skip:
863
                    pes->state = MPEGTS_SKIP;
864
                    continue;
865
                }
866
            }
867
            break;
868
            /**********************************************/
869
            /* PES packing parsing */
870
        case MPEGTS_PESHEADER_FILL:
871
            len = pes->pes_header_size - pes->data_index;
872
            if (len < 0)
873
                return -1;
874
            if (len > buf_size)
875
                len = buf_size;
876
            memcpy(pes->header + pes->data_index, p, len);
877
            pes->data_index += len;
878
            p += len;
879
            buf_size -= len;
880
            if (pes->data_index == pes->pes_header_size) {
881
                const uint8_t *r;
882
                unsigned int flags;
883

    
884
                flags = pes->header[7];
885
                r = pes->header + 9;
886
                pes->pts = AV_NOPTS_VALUE;
887
                pes->dts = AV_NOPTS_VALUE;
888
                if ((flags & 0xc0) == 0x80) {
889
                    pes->dts = pes->pts = get_pts(r);
890
                    r += 5;
891
                } else if ((flags & 0xc0) == 0xc0) {
892
                    pes->pts = get_pts(r);
893
                    r += 5;
894
                    pes->dts = get_pts(r);
895
                    r += 5;
896
                }
897

    
898
                if (pes->total_size > pes->data_index - 6)
899
                    pes->total_size -= pes->data_index - 6;
900
                else
901
                    pes->total_size = MAX_PES_PAYLOAD;
902
                /* allocate pes buffer */
903
                pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
904
                if (!pes->buffer)
905
                    return AVERROR(ENOMEM);
906

    
907
                /* we got the full header. We parse it and get the payload */
908
                pes->state = MPEGTS_PAYLOAD;
909
                pes->data_index = 0;
910
            }
911
            break;
912
        case MPEGTS_PAYLOAD:
913
            if (buf_size > 0) {
914
                if (pes->data_index+buf_size > pes->total_size) {
915
                    new_pes_packet(pes, ts->pkt);
916
                    pes->total_size = MAX_PES_PAYLOAD;
917
                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
918
                    if (!pes->buffer)
919
                        return AVERROR(ENOMEM);
920
                    ts->stop_parse = 1;
921
                }
922
                memcpy(pes->buffer+pes->data_index, p, buf_size);
923
                pes->data_index += buf_size;
924
            }
925
            buf_size = 0;
926
            break;
927
        case MPEGTS_SKIP:
928
            buf_size = 0;
929
            break;
930
        }
931
    }
932

    
933
    return 0;
934
}
935

    
936
static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
937
{
938
    AVStream *st;
939
    enum CodecID codec_id;
940
    enum CodecType codec_type;
941

    
942
    switch(pes->stream_type){
943
    case STREAM_TYPE_AUDIO_MPEG1:
944
    case STREAM_TYPE_AUDIO_MPEG2:
945
        codec_type = CODEC_TYPE_AUDIO;
946
        codec_id = CODEC_ID_MP3;
947
        break;
948
    case STREAM_TYPE_VIDEO_MPEG1:
949
    case STREAM_TYPE_VIDEO_MPEG2:
950
        codec_type = CODEC_TYPE_VIDEO;
951
        codec_id = CODEC_ID_MPEG2VIDEO;
952
        break;
953
    case STREAM_TYPE_VIDEO_MPEG4:
954
        codec_type = CODEC_TYPE_VIDEO;
955
        codec_id = CODEC_ID_MPEG4;
956
        break;
957
    case STREAM_TYPE_VIDEO_H264:
958
        codec_type = CODEC_TYPE_VIDEO;
959
        codec_id = CODEC_ID_H264;
960
        break;
961
    case STREAM_TYPE_VIDEO_VC1:
962
        codec_type = CODEC_TYPE_VIDEO;
963
        codec_id = CODEC_ID_VC1;
964
        break;
965
    case STREAM_TYPE_VIDEO_DIRAC:
966
        codec_type = CODEC_TYPE_VIDEO;
967
        codec_id = CODEC_ID_DIRAC;
968
        break;
969
    case STREAM_TYPE_AUDIO_AAC:
970
        codec_type = CODEC_TYPE_AUDIO;
971
        codec_id = CODEC_ID_AAC;
972
        break;
973
    case STREAM_TYPE_AUDIO_AC3:
974
        codec_type = CODEC_TYPE_AUDIO;
975
        codec_id = CODEC_ID_AC3;
976
        break;
977
    case STREAM_TYPE_AUDIO_DTS:
978
    case STREAM_TYPE_AUDIO_HDMV_DTS:
979
        codec_type = CODEC_TYPE_AUDIO;
980
        codec_id = CODEC_ID_DTS;
981
        break;
982
    case STREAM_TYPE_SUBTITLE_DVB:
983
        codec_type = CODEC_TYPE_SUBTITLE;
984
        codec_id = CODEC_ID_DVB_SUBTITLE;
985
        break;
986
    default:
987
        if (code >= 0x1c0 && code <= 0x1df) {
988
            codec_type = CODEC_TYPE_AUDIO;
989
            codec_id = CODEC_ID_MP2;
990
        } else if (code == 0x1bd) {
991
            codec_type = CODEC_TYPE_AUDIO;
992
            codec_id = CODEC_ID_AC3;
993
        } else {
994
            codec_type = CODEC_TYPE_DATA;
995
            codec_id = CODEC_ID_PROBE;
996
        }
997
        break;
998
    }
999
    st = av_new_stream(pes->stream, pes->pid);
1000
    if (st) {
1001
        av_set_pts_info(st, 33, 1, 90000);
1002
        st->priv_data = pes;
1003
        st->codec->codec_type = codec_type;
1004
        st->codec->codec_id = codec_id;
1005
        st->need_parsing = AVSTREAM_PARSE_FULL;
1006
        pes->st = st;
1007
    }
1008
    return st;
1009
}
1010

    
1011

    
1012
static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1013
{
1014
    MpegTSFilter *tss;
1015
    PESContext *pes;
1016

    
1017
    /* if no pid found, then add a pid context */
1018
    pes = av_mallocz(sizeof(PESContext));
1019
    if (!pes)
1020
        return 0;
1021
    pes->ts = ts;
1022
    pes->stream = ts->stream;
1023
    pes->pid = pid;
1024
    pes->pcr_pid = pcr_pid;
1025
    pes->stream_type = stream_type;
1026
    tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1027
    if (!tss) {
1028
        av_free(pes);
1029
        return 0;
1030
    }
1031
    return pes;
1032
}
1033

    
1034
/* handle one TS packet */
1035
static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1036
{
1037
    AVFormatContext *s = ts->stream;
1038
    MpegTSFilter *tss;
1039
    int len, pid, cc, cc_ok, afc, is_start;
1040
    const uint8_t *p, *p_end;
1041
    int64_t pos;
1042

    
1043
    pid = AV_RB16(packet + 1) & 0x1fff;
1044
    if(pid && discard_pid(ts, pid))
1045
        return 0;
1046
    is_start = packet[1] & 0x40;
1047
    tss = ts->pids[pid];
1048
    if (ts->auto_guess && tss == NULL && is_start) {
1049
        add_pes_stream(ts, pid, -1, 0);
1050
        tss = ts->pids[pid];
1051
    }
1052
    if (!tss)
1053
        return 0;
1054

    
1055
    /* continuity check (currently not used) */
1056
    cc = (packet[3] & 0xf);
1057
    cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1058
    tss->last_cc = cc;
1059

    
1060
    /* skip adaptation field */
1061
    afc = (packet[3] >> 4) & 3;
1062
    p = packet + 4;
1063
    if (afc == 0) /* reserved value */
1064
        return 0;
1065
    if (afc == 2) /* adaptation field only */
1066
        return 0;
1067
    if (afc == 3) {
1068
        /* skip adapation field */
1069
        p += p[0] + 1;
1070
    }
1071
    /* if past the end of packet, ignore */
1072
    p_end = packet + TS_PACKET_SIZE;
1073
    if (p >= p_end)
1074
        return 0;
1075

    
1076
    pos = url_ftell(ts->stream->pb);
1077
    ts->pos47= pos % ts->raw_packet_size;
1078

    
1079
    if (tss->type == MPEGTS_SECTION) {
1080
        if (is_start) {
1081
            /* pointer field present */
1082
            len = *p++;
1083
            if (p + len > p_end)
1084
                return 0;
1085
            if (len && cc_ok) {
1086
                /* write remaining section bytes */
1087
                write_section_data(s, tss,
1088
                                   p, len, 0);
1089
                /* check whether filter has been closed */
1090
                if (!ts->pids[pid])
1091
                    return 0;
1092
            }
1093
            p += len;
1094
            if (p < p_end) {
1095
                write_section_data(s, tss,
1096
                                   p, p_end - p, 1);
1097
            }
1098
        } else {
1099
            if (cc_ok) {
1100
                write_section_data(s, tss,
1101
                                   p, p_end - p, 0);
1102
            }
1103
        }
1104
    } else {
1105
        int ret;
1106
        // Note: The position here points actually behind the current packet.
1107
        if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1108
                                            pos - ts->raw_packet_size)) < 0)
1109
            return ret;
1110
    }
1111

    
1112
    return 0;
1113
}
1114

    
1115
/* XXX: try to find a better synchro over several packets (use
1116
   get_packet_size() ?) */
1117
static int mpegts_resync(ByteIOContext *pb)
1118
{
1119
    int c, i;
1120

    
1121
    for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1122
        c = url_fgetc(pb);
1123
        if (c < 0)
1124
            return -1;
1125
        if (c == 0x47) {
1126
            url_fseek(pb, -1, SEEK_CUR);
1127
            return 0;
1128
        }
1129
    }
1130
    /* no sync found */
1131
    return -1;
1132
}
1133

    
1134
/* return -1 if error or EOF. Return 0 if OK. */
1135
static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1136
{
1137
    int skip, len;
1138

    
1139
    for(;;) {
1140
        len = get_buffer(pb, buf, TS_PACKET_SIZE);
1141
        if (len != TS_PACKET_SIZE)
1142
            return AVERROR(EIO);
1143
        /* check paquet sync byte */
1144
        if (buf[0] != 0x47) {
1145
            /* find a new packet start */
1146
            url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1147
            if (mpegts_resync(pb) < 0)
1148
                return AVERROR_INVALIDDATA;
1149
            else
1150
                continue;
1151
        } else {
1152
            skip = raw_packet_size - TS_PACKET_SIZE;
1153
            if (skip > 0)
1154
                url_fskip(pb, skip);
1155
            break;
1156
        }
1157
    }
1158
    return 0;
1159
}
1160

    
1161
static int handle_packets(MpegTSContext *ts, int nb_packets)
1162
{
1163
    AVFormatContext *s = ts->stream;
1164
    ByteIOContext *pb = s->pb;
1165
    uint8_t packet[TS_PACKET_SIZE];
1166
    int packet_num, ret;
1167

    
1168
    ts->stop_parse = 0;
1169
    packet_num = 0;
1170
    for(;;) {
1171
        if (ts->stop_parse>0)
1172
            break;
1173
        packet_num++;
1174
        if (nb_packets != 0 && packet_num >= nb_packets)
1175
            break;
1176
        ret = read_packet(pb, packet, ts->raw_packet_size);
1177
        if (ret != 0)
1178
            return ret;
1179
        ret = handle_packet(ts, packet);
1180
        if (ret != 0)
1181
            return ret;
1182
    }
1183
    return 0;
1184
}
1185

    
1186
static int mpegts_probe(AVProbeData *p)
1187
{
1188
#if 1
1189
    const int size= p->buf_size;
1190
    int score, fec_score, dvhs_score;
1191
    int check_count= size / TS_FEC_PACKET_SIZE;
1192
#define CHECK_COUNT 10
1193

    
1194
    if (check_count < CHECK_COUNT)
1195
        return -1;
1196

    
1197
    score     = analyze(p->buf, TS_PACKET_SIZE     *check_count, TS_PACKET_SIZE     , NULL)*CHECK_COUNT/check_count;
1198
    dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1199
    fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1200
//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1201

    
1202
// we need a clear definition for the returned score otherwise things will become messy sooner or later
1203
    if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
1204
    else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
1205
    else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1206
    else                                    return -1;
1207
#else
1208
    /* only use the extension for safer guess */
1209
    if (match_ext(p->filename, "ts"))
1210
        return AVPROBE_SCORE_MAX;
1211
    else
1212
        return 0;
1213
#endif
1214
}
1215

    
1216
/* return the 90kHz PCR and the extension for the 27MHz PCR. return
1217
   (-1) if not available */
1218
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1219
                     const uint8_t *packet)
1220
{
1221
    int afc, len, flags;
1222
    const uint8_t *p;
1223
    unsigned int v;
1224

    
1225
    afc = (packet[3] >> 4) & 3;
1226
    if (afc <= 1)
1227
        return -1;
1228
    p = packet + 4;
1229
    len = p[0];
1230
    p++;
1231
    if (len == 0)
1232
        return -1;
1233
    flags = *p++;
1234
    len--;
1235
    if (!(flags & 0x10))
1236
        return -1;
1237
    if (len < 6)
1238
        return -1;
1239
    v = AV_RB32(p);
1240
    *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1241
    *ppcr_low = ((p[4] & 1) << 8) | p[5];
1242
    return 0;
1243
}
1244

    
1245
static int mpegts_read_header(AVFormatContext *s,
1246
                              AVFormatParameters *ap)
1247
{
1248
    MpegTSContext *ts = s->priv_data;
1249
    ByteIOContext *pb = s->pb;
1250
    uint8_t buf[5*1024];
1251
    int len;
1252
    int64_t pos;
1253

    
1254
    if (ap) {
1255
        ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1256
        if(ap->mpeg2ts_raw){
1257
            av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1258
            return -1;
1259
        }
1260
    }
1261

    
1262
    /* read the first 1024 bytes to get packet size */
1263
    pos = url_ftell(pb);
1264
    len = get_buffer(pb, buf, sizeof(buf));
1265
    if (len != sizeof(buf))
1266
        goto fail;
1267
    ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1268
    if (ts->raw_packet_size <= 0)
1269
        goto fail;
1270
    ts->stream = s;
1271
    ts->auto_guess = 0;
1272

    
1273
    if (s->iformat == &mpegts_demuxer) {
1274
        /* normal demux */
1275

    
1276
        /* first do a scaning to get all the services */
1277
        url_fseek(pb, pos, SEEK_SET);
1278

    
1279
        mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1280

    
1281
        mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1282

    
1283
        handle_packets(ts, s->probesize);
1284
        /* if could not find service, enable auto_guess */
1285

    
1286
        ts->auto_guess = 1;
1287

    
1288
        dprintf(ts->stream, "tuning done\n");
1289

    
1290
        s->ctx_flags |= AVFMTCTX_NOHEADER;
1291
    } else {
1292
        AVStream *st;
1293
        int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1294
        int64_t pcrs[2], pcr_h;
1295
        int packet_count[2];
1296
        uint8_t packet[TS_PACKET_SIZE];
1297

    
1298
        /* only read packets */
1299

    
1300
        st = av_new_stream(s, 0);
1301
        if (!st)
1302
            goto fail;
1303
        av_set_pts_info(st, 60, 1, 27000000);
1304
        st->codec->codec_type = CODEC_TYPE_DATA;
1305
        st->codec->codec_id = CODEC_ID_MPEG2TS;
1306

    
1307
        /* we iterate until we find two PCRs to estimate the bitrate */
1308
        pcr_pid = -1;
1309
        nb_pcrs = 0;
1310
        nb_packets = 0;
1311
        for(;;) {
1312
            ret = read_packet(s->pb, packet, ts->raw_packet_size);
1313
            if (ret < 0)
1314
                return -1;
1315
            pid = AV_RB16(packet + 1) & 0x1fff;
1316
            if ((pcr_pid == -1 || pcr_pid == pid) &&
1317
                parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1318
                pcr_pid = pid;
1319
                packet_count[nb_pcrs] = nb_packets;
1320
                pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1321
                nb_pcrs++;
1322
                if (nb_pcrs >= 2)
1323
                    break;
1324
            }
1325
            nb_packets++;
1326
        }
1327

    
1328
        /* NOTE1: the bitrate is computed without the FEC */
1329
        /* NOTE2: it is only the bitrate of the start of the stream */
1330
        ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1331
        ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1332
        s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1333
        st->codec->bit_rate = s->bit_rate;
1334
        st->start_time = ts->cur_pcr;
1335
#if 0
1336
        av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1337
               st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1338
#endif
1339
    }
1340

    
1341
    url_fseek(pb, pos, SEEK_SET);
1342
    return 0;
1343
 fail:
1344
    return -1;
1345
}
1346

    
1347
#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1348

    
1349
static int mpegts_raw_read_packet(AVFormatContext *s,
1350
                                  AVPacket *pkt)
1351
{
1352
    MpegTSContext *ts = s->priv_data;
1353
    int ret, i;
1354
    int64_t pcr_h, next_pcr_h, pos;
1355
    int pcr_l, next_pcr_l;
1356
    uint8_t pcr_buf[12];
1357

    
1358
    if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1359
        return AVERROR(ENOMEM);
1360
    pkt->pos= url_ftell(s->pb);
1361
    ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1362
    if (ret < 0) {
1363
        av_free_packet(pkt);
1364
        return ret;
1365
    }
1366
    if (ts->mpeg2ts_compute_pcr) {
1367
        /* compute exact PCR for each packet */
1368
        if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1369
            /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1370
            pos = url_ftell(s->pb);
1371
            for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1372
                url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1373
                get_buffer(s->pb, pcr_buf, 12);
1374
                if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1375
                    /* XXX: not precise enough */
1376
                    ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1377
                        (i + 1);
1378
                    break;
1379
                }
1380
            }
1381
            url_fseek(s->pb, pos, SEEK_SET);
1382
            /* no next PCR found: we use previous increment */
1383
            ts->cur_pcr = pcr_h * 300 + pcr_l;
1384
        }
1385
        pkt->pts = ts->cur_pcr;
1386
        pkt->duration = ts->pcr_incr;
1387
        ts->cur_pcr += ts->pcr_incr;
1388
    }
1389
    pkt->stream_index = 0;
1390
    return 0;
1391
}
1392

    
1393
static int mpegts_read_packet(AVFormatContext *s,
1394
                              AVPacket *pkt)
1395
{
1396
    MpegTSContext *ts = s->priv_data;
1397
    int ret, i;
1398

    
1399
    if (url_ftell(s->pb) != ts->last_pos) {
1400
        /* seek detected, flush pes buffer */
1401
        for (i = 0; i < NB_PID_MAX; i++) {
1402
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1403
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1404
                av_freep(&pes->buffer);
1405
                pes->data_index = 0;
1406
                pes->state = MPEGTS_SKIP; /* skip until pes header */
1407
            }
1408
        }
1409
    }
1410

    
1411
    ts->pkt = pkt;
1412
    ret = handle_packets(ts, 0);
1413
    if (ret < 0) {
1414
        /* flush pes data left */
1415
        for (i = 0; i < NB_PID_MAX; i++) {
1416
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1417
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1418
                if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1419
                    new_pes_packet(pes, pkt);
1420
                    ret = 0;
1421
                    break;
1422
                }
1423
            }
1424
        }
1425
    }
1426

    
1427
    ts->last_pos = url_ftell(s->pb);
1428

    
1429
    return ret;
1430
}
1431

    
1432
static int mpegts_read_close(AVFormatContext *s)
1433
{
1434
    MpegTSContext *ts = s->priv_data;
1435
    int i;
1436

    
1437
    clear_programs(ts);
1438

    
1439
    for(i=0;i<NB_PID_MAX;i++)
1440
        if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1441

    
1442
    return 0;
1443
}
1444

    
1445
static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1446
                              int64_t *ppos, int64_t pos_limit)
1447
{
1448
    MpegTSContext *ts = s->priv_data;
1449
    int64_t pos, timestamp;
1450
    uint8_t buf[TS_PACKET_SIZE];
1451
    int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1452
    const int find_next= 1;
1453
    pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1454
    if (find_next) {
1455
        for(;;) {
1456
            url_fseek(s->pb, pos, SEEK_SET);
1457
            if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1458
                return AV_NOPTS_VALUE;
1459
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1460
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1461
                break;
1462
            }
1463
            pos += ts->raw_packet_size;
1464
        }
1465
    } else {
1466
        for(;;) {
1467
            pos -= ts->raw_packet_size;
1468
            if (pos < 0)
1469
                return AV_NOPTS_VALUE;
1470
            url_fseek(s->pb, pos, SEEK_SET);
1471
            if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1472
                return AV_NOPTS_VALUE;
1473
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1474
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1475
                break;
1476
            }
1477
        }
1478
    }
1479
    *ppos = pos;
1480

    
1481
    return timestamp;
1482
}
1483

    
1484
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1485
    MpegTSContext *ts = s->priv_data;
1486
    uint8_t buf[TS_PACKET_SIZE];
1487
    int64_t pos;
1488

    
1489
    if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1490
        return -1;
1491

    
1492
    pos= url_ftell(s->pb);
1493

    
1494
    for(;;) {
1495
        url_fseek(s->pb, pos, SEEK_SET);
1496
        if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1497
            return -1;
1498
//        pid = AV_RB16(buf + 1) & 0x1fff;
1499
        if(buf[1] & 0x40) break;
1500
        pos += ts->raw_packet_size;
1501
    }
1502
    url_fseek(s->pb, pos, SEEK_SET);
1503

    
1504
    return 0;
1505
}
1506

    
1507
/**************************************************************/
1508
/* parsing functions - called from other demuxers such as RTP */
1509

    
1510
MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1511
{
1512
    MpegTSContext *ts;
1513

    
1514
    ts = av_mallocz(sizeof(MpegTSContext));
1515
    if (!ts)
1516
        return NULL;
1517
    /* no stream case, currently used by RTP */
1518
    ts->raw_packet_size = TS_PACKET_SIZE;
1519
    ts->stream = s;
1520
    ts->auto_guess = 1;
1521
    return ts;
1522
}
1523

    
1524
/* return the consumed length if a packet was output, or -1 if no
1525
   packet is output */
1526
int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1527
                        const uint8_t *buf, int len)
1528
{
1529
    int len1;
1530

    
1531
    len1 = len;
1532
    ts->pkt = pkt;
1533
    ts->stop_parse = 0;
1534
    for(;;) {
1535
        if (ts->stop_parse>0)
1536
            break;
1537
        if (len < TS_PACKET_SIZE)
1538
            return -1;
1539
        if (buf[0] != 0x47) {
1540
            buf++;
1541
            len--;
1542
        } else {
1543
            handle_packet(ts, buf);
1544
            buf += TS_PACKET_SIZE;
1545
            len -= TS_PACKET_SIZE;
1546
        }
1547
    }
1548
    return len1 - len;
1549
}
1550

    
1551
void mpegts_parse_close(MpegTSContext *ts)
1552
{
1553
    int i;
1554

    
1555
    for(i=0;i<NB_PID_MAX;i++)
1556
        av_free(ts->pids[i]);
1557
    av_free(ts);
1558
}
1559

    
1560
AVInputFormat mpegts_demuxer = {
1561
    "mpegts",
1562
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1563
    sizeof(MpegTSContext),
1564
    mpegts_probe,
1565
    mpegts_read_header,
1566
    mpegts_read_packet,
1567
    mpegts_read_close,
1568
    read_seek,
1569
    mpegts_get_pcr,
1570
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1571
};
1572

    
1573
AVInputFormat mpegtsraw_demuxer = {
1574
    "mpegtsraw",
1575
    NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1576
    sizeof(MpegTSContext),
1577
    NULL,
1578
    mpegts_read_header,
1579
    mpegts_raw_read_packet,
1580
    mpegts_read_close,
1581
    read_seek,
1582
    mpegts_get_pcr,
1583
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1584
};