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ffmpeg / libavformat / mpegts.c @ a2fc93f7

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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.
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 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * 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
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 * 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
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 */
21

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

    
26
#include "libavutil/crc.h"
27
#include "libavutil/intreadwrite.h"
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#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"
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#include "avio_internal.h"
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#include "seek.h"
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#include "mpeg.h"
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#include "isom.h"
36

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

    
41
#define MAX_PES_PAYLOAD 200*1024
42

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

    
48
typedef struct MpegTSFilter MpegTSFilter;
49

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

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

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

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

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

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

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

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

    
94
    int pos47;
95

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

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

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

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

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

    
120

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

    
125
/* TS stream handling */
126

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

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

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

    
160
extern AVInputFormat ff_mpegts_demuxer;
161

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

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

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

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

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

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

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

    
238
    return !used && discarded;
239
}
240

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
378
    return best_score;
379
}
380

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
552
static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
553
                                  uint32_t stream_type, uint32_t prog_reg_desc)
554
{
555
    av_set_pts_info(st, 33, 1, 90000);
556
    st->priv_data = pes;
557
    st->codec->codec_type = AVMEDIA_TYPE_DATA;
558
    st->codec->codec_id   = CODEC_ID_NONE;
559
    st->need_parsing = AVSTREAM_PARSE_FULL;
560
    pes->st = st;
561
    pes->stream_type = stream_type;
562

    
563
    av_log(pes->stream, AV_LOG_DEBUG,
564
           "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
565
           st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
566

    
567
    st->codec->codec_tag = pes->stream_type;
568

    
569
    mpegts_find_stream_type(st, pes->stream_type, ISO_types);
570
    if (prog_reg_desc == AV_RL32("HDMV") &&
571
        st->codec->codec_id == CODEC_ID_NONE) {
572
        mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
573
        if (pes->stream_type == 0x83) {
574
            // HDMV TrueHD streams also contain an AC3 coded version of the
575
            // audio track - add a second stream for this
576
            AVStream *sub_st;
577
            // priv_data cannot be shared between streams
578
            PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
579
            if (!sub_pes)
580
                return AVERROR(ENOMEM);
581
            memcpy(sub_pes, pes, sizeof(*sub_pes));
582

    
583
            sub_st = av_new_stream(pes->stream, pes->pid);
584
            if (!sub_st) {
585
                av_free(sub_pes);
586
                return AVERROR(ENOMEM);
587
            }
588

    
589
            av_set_pts_info(sub_st, 33, 1, 90000);
590
            sub_st->priv_data = sub_pes;
591
            sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
592
            sub_st->codec->codec_id   = CODEC_ID_AC3;
593
            sub_st->need_parsing = AVSTREAM_PARSE_FULL;
594
            sub_pes->sub_st = pes->sub_st = sub_st;
595
        }
596
    }
597
    if (st->codec->codec_id == CODEC_ID_NONE)
598
        mpegts_find_stream_type(st, pes->stream_type, MISC_types);
599

    
600
    return 0;
601
}
602

    
603
static void new_pes_packet(PESContext *pes, AVPacket *pkt)
604
{
605
    av_init_packet(pkt);
606

    
607
    pkt->destruct = av_destruct_packet;
608
    pkt->data = pes->buffer;
609
    pkt->size = pes->data_index;
610
    memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
611

    
612
    // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
613
    if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
614
        pkt->stream_index = pes->sub_st->index;
615
    else
616
        pkt->stream_index = pes->st->index;
617
    pkt->pts = pes->pts;
618
    pkt->dts = pes->dts;
619
    /* store position of first TS packet of this PES packet */
620
    pkt->pos = pes->ts_packet_pos;
621

    
622
    /* reset pts values */
623
    pes->pts = AV_NOPTS_VALUE;
624
    pes->dts = AV_NOPTS_VALUE;
625
    pes->buffer = NULL;
626
    pes->data_index = 0;
627
}
628

    
629
/* return non zero if a packet could be constructed */
630
static int mpegts_push_data(MpegTSFilter *filter,
631
                            const uint8_t *buf, int buf_size, int is_start,
632
                            int64_t pos)
633
{
634
    PESContext *pes = filter->u.pes_filter.opaque;
635
    MpegTSContext *ts = pes->ts;
636
    const uint8_t *p;
637
    int len, code;
638

    
639
    if(!ts->pkt)
640
        return 0;
641

    
642
    if (is_start) {
643
        if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
644
            new_pes_packet(pes, ts->pkt);
645
            ts->stop_parse = 1;
646
        }
647
        pes->state = MPEGTS_HEADER;
648
        pes->data_index = 0;
649
        pes->ts_packet_pos = pos;
650
    }
651
    p = buf;
652
    while (buf_size > 0) {
653
        switch(pes->state) {
654
        case MPEGTS_HEADER:
655
            len = PES_START_SIZE - pes->data_index;
656
            if (len > buf_size)
657
                len = buf_size;
658
            memcpy(pes->header + pes->data_index, p, len);
659
            pes->data_index += len;
660
            p += len;
661
            buf_size -= len;
662
            if (pes->data_index == PES_START_SIZE) {
663
                /* we got all the PES or section header. We can now
664
                   decide */
665
#if 0
666
                av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
667
#endif
668
                if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
669
                    pes->header[2] == 0x01) {
670
                    /* it must be an mpeg2 PES stream */
671
                    code = pes->header[3] | 0x100;
672
                    av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
673

    
674
                    if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
675
                        code == 0x1be) /* padding_stream */
676
                        goto skip;
677

    
678
#if FF_API_MAX_STREAMS
679
                    if (!pes->st && pes->stream->nb_streams == MAX_STREAMS)
680
                        goto skip;
681
#endif
682

    
683
                    /* stream not present in PMT */
684
                    if (!pes->st) {
685
                        pes->st = av_new_stream(ts->stream, pes->pid);
686
                        if (!pes->st)
687
                            return AVERROR(ENOMEM);
688
                        mpegts_set_stream_info(pes->st, pes, 0, 0);
689
                    }
690

    
691
                    pes->total_size = AV_RB16(pes->header + 4);
692
                    /* NOTE: a zero total size means the PES size is
693
                       unbounded */
694
                    if (!pes->total_size)
695
                        pes->total_size = MAX_PES_PAYLOAD;
696

    
697
                    /* allocate pes buffer */
698
                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
699
                    if (!pes->buffer)
700
                        return AVERROR(ENOMEM);
701

    
702
                    if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
703
                        code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
704
                        code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
705
                        code != 0x1f8) {                  /* ITU-T Rec. H.222.1 type E stream */
706
                        pes->state = MPEGTS_PESHEADER;
707
                        if (pes->st->codec->codec_id == CODEC_ID_NONE) {
708
                            av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
709
                                    pes->pid, pes->stream_type);
710
                            pes->st->codec->codec_id = CODEC_ID_PROBE;
711
                        }
712
                    } else {
713
                        pes->state = MPEGTS_PAYLOAD;
714
                        pes->data_index = 0;
715
                    }
716
                } else {
717
                    /* otherwise, it should be a table */
718
                    /* skip packet */
719
                skip:
720
                    pes->state = MPEGTS_SKIP;
721
                    continue;
722
                }
723
            }
724
            break;
725
            /**********************************************/
726
            /* PES packing parsing */
727
        case MPEGTS_PESHEADER:
728
            len = PES_HEADER_SIZE - pes->data_index;
729
            if (len < 0)
730
                return -1;
731
            if (len > buf_size)
732
                len = buf_size;
733
            memcpy(pes->header + pes->data_index, p, len);
734
            pes->data_index += len;
735
            p += len;
736
            buf_size -= len;
737
            if (pes->data_index == PES_HEADER_SIZE) {
738
                pes->pes_header_size = pes->header[8] + 9;
739
                pes->state = MPEGTS_PESHEADER_FILL;
740
            }
741
            break;
742
        case MPEGTS_PESHEADER_FILL:
743
            len = pes->pes_header_size - pes->data_index;
744
            if (len < 0)
745
                return -1;
746
            if (len > buf_size)
747
                len = buf_size;
748
            memcpy(pes->header + pes->data_index, p, len);
749
            pes->data_index += len;
750
            p += len;
751
            buf_size -= len;
752
            if (pes->data_index == pes->pes_header_size) {
753
                const uint8_t *r;
754
                unsigned int flags, pes_ext, skip;
755

    
756
                flags = pes->header[7];
757
                r = pes->header + 9;
758
                pes->pts = AV_NOPTS_VALUE;
759
                pes->dts = AV_NOPTS_VALUE;
760
                if ((flags & 0xc0) == 0x80) {
761
                    pes->dts = pes->pts = ff_parse_pes_pts(r);
762
                    r += 5;
763
                } else if ((flags & 0xc0) == 0xc0) {
764
                    pes->pts = ff_parse_pes_pts(r);
765
                    r += 5;
766
                    pes->dts = ff_parse_pes_pts(r);
767
                    r += 5;
768
                }
769
                pes->extended_stream_id = -1;
770
                if (flags & 0x01) { /* PES extension */
771
                    pes_ext = *r++;
772
                    /* Skip PES private data, program packet sequence counter and P-STD buffer */
773
                    skip = (pes_ext >> 4) & 0xb;
774
                    skip += skip & 0x9;
775
                    r += skip;
776
                    if ((pes_ext & 0x41) == 0x01 &&
777
                        (r + 2) <= (pes->header + pes->pes_header_size)) {
778
                        /* PES extension 2 */
779
                        if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
780
                            pes->extended_stream_id = r[1];
781
                    }
782
                }
783

    
784
                /* we got the full header. We parse it and get the payload */
785
                pes->state = MPEGTS_PAYLOAD;
786
                pes->data_index = 0;
787
            }
788
            break;
789
        case MPEGTS_PAYLOAD:
790
            if (buf_size > 0 && pes->buffer) {
791
                if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
792
                    new_pes_packet(pes, ts->pkt);
793
                    pes->total_size = MAX_PES_PAYLOAD;
794
                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
795
                    if (!pes->buffer)
796
                        return AVERROR(ENOMEM);
797
                    ts->stop_parse = 1;
798
                } else if (pes->data_index == 0 && buf_size > pes->total_size) {
799
                    // pes packet size is < ts size packet and pes data is padded with 0xff
800
                    // not sure if this is legal in ts but see issue #2392
801
                    buf_size = pes->total_size;
802
                }
803
                memcpy(pes->buffer+pes->data_index, p, buf_size);
804
                pes->data_index += buf_size;
805
            }
806
            buf_size = 0;
807
            /* emit complete packets with known packet size
808
             * decreases demuxer delay for infrequent packets like subtitles from
809
             * a couple of seconds to milliseconds for properly muxed files.
810
             * total_size is the number of bytes following pes_packet_length
811
             * in the pes header, i.e. not counting the first 6 bytes */
812
            if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
813
                pes->pes_header_size + pes->data_index == pes->total_size + 6) {
814
                ts->stop_parse = 1;
815
                new_pes_packet(pes, ts->pkt);
816
            }
817
            break;
818
        case MPEGTS_SKIP:
819
            buf_size = 0;
820
            break;
821
        }
822
    }
823

    
824
    return 0;
825
}
826

    
827
static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
828
{
829
    MpegTSFilter *tss;
830
    PESContext *pes;
831

    
832
    /* if no pid found, then add a pid context */
833
    pes = av_mallocz(sizeof(PESContext));
834
    if (!pes)
835
        return 0;
836
    pes->ts = ts;
837
    pes->stream = ts->stream;
838
    pes->pid = pid;
839
    pes->pcr_pid = pcr_pid;
840
    pes->state = MPEGTS_SKIP;
841
    pes->pts = AV_NOPTS_VALUE;
842
    pes->dts = AV_NOPTS_VALUE;
843
    tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
844
    if (!tss) {
845
        av_free(pes);
846
        return 0;
847
    }
848
    return pes;
849
}
850

    
851
static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
852
                         int *es_id, uint8_t **dec_config_descr,
853
                         int *dec_config_descr_size)
854
{
855
    AVIOContext pb;
856
    int tag;
857
    unsigned len;
858

    
859
    ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
860

    
861
    len = ff_mp4_read_descr(s, &pb, &tag);
862
    if (tag == MP4IODescrTag) {
863
        avio_rb16(&pb); // ID
864
        avio_r8(&pb);
865
        avio_r8(&pb);
866
        avio_r8(&pb);
867
        avio_r8(&pb);
868
        avio_r8(&pb);
869
        len = ff_mp4_read_descr(s, &pb, &tag);
870
        if (tag == MP4ESDescrTag) {
871
            *es_id = avio_rb16(&pb); /* ES_ID */
872
            av_dlog(s, "ES_ID %#x\n", *es_id);
873
            avio_r8(&pb); /* priority */
874
            len = ff_mp4_read_descr(s, &pb, &tag);
875
            if (tag == MP4DecConfigDescrTag) {
876
                *dec_config_descr = av_malloc(len);
877
                if (!*dec_config_descr)
878
                    return AVERROR(ENOMEM);
879
                *dec_config_descr_size = len;
880
                avio_read(&pb, *dec_config_descr, len);
881
            }
882
        }
883
    }
884
    return 0;
885
}
886

    
887
int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
888
                              const uint8_t **pp, const uint8_t *desc_list_end,
889
                              int mp4_dec_config_descr_len, int mp4_es_id, int pid,
890
                              uint8_t *mp4_dec_config_descr)
891
{
892
    const uint8_t *desc_end;
893
    int desc_len, desc_tag;
894
    char language[4];
895

    
896
    desc_tag = get8(pp, desc_list_end);
897
    if (desc_tag < 0)
898
        return -1;
899
    desc_len = get8(pp, desc_list_end);
900
    if (desc_len < 0)
901
        return -1;
902
    desc_end = *pp + desc_len;
903
    if (desc_end > desc_list_end)
904
        return -1;
905

    
906
    av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
907

    
908
    if (st->codec->codec_id == CODEC_ID_NONE &&
909
        stream_type == STREAM_TYPE_PRIVATE_DATA)
910
        mpegts_find_stream_type(st, desc_tag, DESC_types);
911

    
912
    switch(desc_tag) {
913
    case 0x1F: /* FMC descriptor */
914
        get16(pp, desc_end);
915
        if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
916
            mp4_dec_config_descr_len && mp4_es_id == pid) {
917
            AVIOContext pb;
918
            ffio_init_context(&pb, mp4_dec_config_descr,
919
                          mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
920
            ff_mp4_read_dec_config_descr(fc, st, &pb);
921
            if (st->codec->codec_id == CODEC_ID_AAC &&
922
                st->codec->extradata_size > 0)
923
                st->need_parsing = 0;
924
        }
925
        break;
926
    case 0x56: /* DVB teletext descriptor */
927
        language[0] = get8(pp, desc_end);
928
        language[1] = get8(pp, desc_end);
929
        language[2] = get8(pp, desc_end);
930
        language[3] = 0;
931
        av_metadata_set2(&st->metadata, "language", language, 0);
932
        break;
933
    case 0x59: /* subtitling descriptor */
934
        language[0] = get8(pp, desc_end);
935
        language[1] = get8(pp, desc_end);
936
        language[2] = get8(pp, desc_end);
937
        language[3] = 0;
938
        /* hearing impaired subtitles detection */
939
        switch(get8(pp, desc_end)) {
940
        case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
941
        case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
942
        case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
943
        case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
944
        case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
945
        case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
946
            st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
947
            break;
948
        }
949
        if (st->codec->extradata) {
950
            if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
951
                av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
952
        } else {
953
            st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
954
            if (st->codec->extradata) {
955
                st->codec->extradata_size = 4;
956
                memcpy(st->codec->extradata, *pp, 4);
957
            }
958
        }
959
        *pp += 4;
960
        av_metadata_set2(&st->metadata, "language", language, 0);
961
        break;
962
    case 0x0a: /* ISO 639 language descriptor */
963
        language[0] = get8(pp, desc_end);
964
        language[1] = get8(pp, desc_end);
965
        language[2] = get8(pp, desc_end);
966
        language[3] = 0;
967
        av_metadata_set2(&st->metadata, "language", language, 0);
968
        switch (get8(pp, desc_end)) {
969
            case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
970
            case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
971
            case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
972
        }
973
        break;
974
    case 0x05: /* registration descriptor */
975
        st->codec->codec_tag = bytestream_get_le32(pp);
976
        av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
977
        if (st->codec->codec_id == CODEC_ID_NONE &&
978
            stream_type == STREAM_TYPE_PRIVATE_DATA)
979
            mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
980
        break;
981
    default:
982
        break;
983
    }
984
    *pp = desc_end;
985
    return 0;
986
}
987

    
988
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
989
{
990
    MpegTSContext *ts = filter->u.section_filter.opaque;
991
    SectionHeader h1, *h = &h1;
992
    PESContext *pes;
993
    AVStream *st;
994
    const uint8_t *p, *p_end, *desc_list_end;
995
    int program_info_length, pcr_pid, pid, stream_type;
996
    int desc_list_len;
997
    uint32_t prog_reg_desc = 0; /* registration descriptor */
998
    uint8_t *mp4_dec_config_descr = NULL;
999
    int mp4_dec_config_descr_len = 0;
1000
    int mp4_es_id = 0;
1001

    
1002
#ifdef DEBUG
1003
    av_dlog(ts->stream, "PMT: len %i\n", section_len);
1004
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1005
#endif
1006

    
1007
    p_end = section + section_len - 4;
1008
    p = section;
1009
    if (parse_section_header(h, &p, p_end) < 0)
1010
        return;
1011

    
1012
    av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1013
           h->id, h->sec_num, h->last_sec_num);
1014

    
1015
    if (h->tid != PMT_TID)
1016
        return;
1017

    
1018
    clear_program(ts, h->id);
1019
    pcr_pid = get16(&p, p_end) & 0x1fff;
1020
    if (pcr_pid < 0)
1021
        return;
1022
    add_pid_to_pmt(ts, h->id, pcr_pid);
1023

    
1024
    av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1025

    
1026
    program_info_length = get16(&p, p_end) & 0xfff;
1027
    if (program_info_length < 0)
1028
        return;
1029
    while(program_info_length >= 2) {
1030
        uint8_t tag, len;
1031
        tag = get8(&p, p_end);
1032
        len = get8(&p, p_end);
1033

    
1034
        av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1035

    
1036
        if(len > program_info_length - 2)
1037
            //something else is broken, exit the program_descriptors_loop
1038
            break;
1039
        program_info_length -= len + 2;
1040
        if (tag == 0x1d) { // IOD descriptor
1041
            get8(&p, p_end); // scope
1042
            get8(&p, p_end); // label
1043
            len -= 2;
1044
            mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1045
                          &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1046
        } else if (tag == 0x05 && len >= 4) { // registration descriptor
1047
            prog_reg_desc = bytestream_get_le32(&p);
1048
            len -= 4;
1049
        }
1050
        p += len;
1051
    }
1052
    p += program_info_length;
1053
    if (p >= p_end)
1054
        goto out;
1055

    
1056
    // stop parsing after pmt, we found header
1057
    if (!ts->stream->nb_streams)
1058
        ts->stop_parse = 1;
1059

    
1060
    for(;;) {
1061
        st = 0;
1062
        stream_type = get8(&p, p_end);
1063
        if (stream_type < 0)
1064
            break;
1065
        pid = get16(&p, p_end) & 0x1fff;
1066
        if (pid < 0)
1067
            break;
1068

    
1069
        /* now create ffmpeg stream */
1070
        if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1071
            pes = ts->pids[pid]->u.pes_filter.opaque;
1072
            if (!pes->st)
1073
                pes->st = av_new_stream(pes->stream, pes->pid);
1074
            st = pes->st;
1075
        } else {
1076
            if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1077
            pes = add_pes_stream(ts, pid, pcr_pid);
1078
            if (pes)
1079
                st = av_new_stream(pes->stream, pes->pid);
1080
        }
1081

    
1082
        if (!st)
1083
            goto out;
1084

    
1085
        if (!pes->stream_type)
1086
            mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1087

    
1088
        add_pid_to_pmt(ts, h->id, pid);
1089

    
1090
        ff_program_add_stream_index(ts->stream, h->id, st->index);
1091

    
1092
        desc_list_len = get16(&p, p_end) & 0xfff;
1093
        if (desc_list_len < 0)
1094
            break;
1095
        desc_list_end = p + desc_list_len;
1096
        if (desc_list_end > p_end)
1097
            break;
1098
        for(;;) {
1099
            if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1100
                mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1101
                break;
1102

    
1103
            if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1104
                ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1105
                pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1106
            }
1107
        }
1108
        p = desc_list_end;
1109
    }
1110

    
1111
 out:
1112
    av_free(mp4_dec_config_descr);
1113
}
1114

    
1115
static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1116
{
1117
    MpegTSContext *ts = filter->u.section_filter.opaque;
1118
    SectionHeader h1, *h = &h1;
1119
    const uint8_t *p, *p_end;
1120
    int sid, pmt_pid;
1121

    
1122
#ifdef DEBUG
1123
    av_dlog(ts->stream, "PAT:\n");
1124
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1125
#endif
1126
    p_end = section + section_len - 4;
1127
    p = section;
1128
    if (parse_section_header(h, &p, p_end) < 0)
1129
        return;
1130
    if (h->tid != PAT_TID)
1131
        return;
1132

    
1133
    clear_programs(ts);
1134
    for(;;) {
1135
        sid = get16(&p, p_end);
1136
        if (sid < 0)
1137
            break;
1138
        pmt_pid = get16(&p, p_end) & 0x1fff;
1139
        if (pmt_pid < 0)
1140
            break;
1141

    
1142
        av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1143

    
1144
        if (sid == 0x0000) {
1145
            /* NIT info */
1146
        } else {
1147
            av_new_program(ts->stream, sid);
1148
            if (ts->pids[pmt_pid])
1149
                mpegts_close_filter(ts, ts->pids[pmt_pid]);
1150
            mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1151
            add_pat_entry(ts, sid);
1152
            add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1153
            add_pid_to_pmt(ts, sid, pmt_pid);
1154
        }
1155
    }
1156
}
1157

    
1158
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1159
{
1160
    MpegTSContext *ts = filter->u.section_filter.opaque;
1161
    SectionHeader h1, *h = &h1;
1162
    const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1163
    int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1164
    char *name, *provider_name;
1165

    
1166
#ifdef DEBUG
1167
    av_dlog(ts->stream, "SDT:\n");
1168
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1169
#endif
1170

    
1171
    p_end = section + section_len - 4;
1172
    p = section;
1173
    if (parse_section_header(h, &p, p_end) < 0)
1174
        return;
1175
    if (h->tid != SDT_TID)
1176
        return;
1177
    onid = get16(&p, p_end);
1178
    if (onid < 0)
1179
        return;
1180
    val = get8(&p, p_end);
1181
    if (val < 0)
1182
        return;
1183
    for(;;) {
1184
        sid = get16(&p, p_end);
1185
        if (sid < 0)
1186
            break;
1187
        val = get8(&p, p_end);
1188
        if (val < 0)
1189
            break;
1190
        desc_list_len = get16(&p, p_end) & 0xfff;
1191
        if (desc_list_len < 0)
1192
            break;
1193
        desc_list_end = p + desc_list_len;
1194
        if (desc_list_end > p_end)
1195
            break;
1196
        for(;;) {
1197
            desc_tag = get8(&p, desc_list_end);
1198
            if (desc_tag < 0)
1199
                break;
1200
            desc_len = get8(&p, desc_list_end);
1201
            desc_end = p + desc_len;
1202
            if (desc_end > desc_list_end)
1203
                break;
1204

    
1205
            av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1206
                   desc_tag, desc_len);
1207

    
1208
            switch(desc_tag) {
1209
            case 0x48:
1210
                service_type = get8(&p, p_end);
1211
                if (service_type < 0)
1212
                    break;
1213
                provider_name = getstr8(&p, p_end);
1214
                if (!provider_name)
1215
                    break;
1216
                name = getstr8(&p, p_end);
1217
                if (name) {
1218
                    AVProgram *program = av_new_program(ts->stream, sid);
1219
                    if(program) {
1220
                        av_metadata_set2(&program->metadata, "service_name", name, 0);
1221
                        av_metadata_set2(&program->metadata, "service_provider", provider_name, 0);
1222
                    }
1223
                }
1224
                av_free(name);
1225
                av_free(provider_name);
1226
                break;
1227
            default:
1228
                break;
1229
            }
1230
            p = desc_end;
1231
        }
1232
        p = desc_list_end;
1233
    }
1234
}
1235

    
1236
/* handle one TS packet */
1237
static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1238
{
1239
    AVFormatContext *s = ts->stream;
1240
    MpegTSFilter *tss;
1241
    int len, pid, cc, cc_ok, afc, is_start;
1242
    const uint8_t *p, *p_end;
1243
    int64_t pos;
1244

    
1245
    pid = AV_RB16(packet + 1) & 0x1fff;
1246
    if(pid && discard_pid(ts, pid))
1247
        return 0;
1248
    is_start = packet[1] & 0x40;
1249
    tss = ts->pids[pid];
1250
    if (ts->auto_guess && tss == NULL && is_start) {
1251
        add_pes_stream(ts, pid, -1);
1252
        tss = ts->pids[pid];
1253
    }
1254
    if (!tss)
1255
        return 0;
1256

    
1257
    /* continuity check (currently not used) */
1258
    cc = (packet[3] & 0xf);
1259
    cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1260
    tss->last_cc = cc;
1261

    
1262
    /* skip adaptation field */
1263
    afc = (packet[3] >> 4) & 3;
1264
    p = packet + 4;
1265
    if (afc == 0) /* reserved value */
1266
        return 0;
1267
    if (afc == 2) /* adaptation field only */
1268
        return 0;
1269
    if (afc == 3) {
1270
        /* skip adapation field */
1271
        p += p[0] + 1;
1272
    }
1273
    /* if past the end of packet, ignore */
1274
    p_end = packet + TS_PACKET_SIZE;
1275
    if (p >= p_end)
1276
        return 0;
1277

    
1278
    pos = avio_tell(ts->stream->pb);
1279
    ts->pos47= pos % ts->raw_packet_size;
1280

    
1281
    if (tss->type == MPEGTS_SECTION) {
1282
        if (is_start) {
1283
            /* pointer field present */
1284
            len = *p++;
1285
            if (p + len > p_end)
1286
                return 0;
1287
            if (len && cc_ok) {
1288
                /* write remaining section bytes */
1289
                write_section_data(s, tss,
1290
                                   p, len, 0);
1291
                /* check whether filter has been closed */
1292
                if (!ts->pids[pid])
1293
                    return 0;
1294
            }
1295
            p += len;
1296
            if (p < p_end) {
1297
                write_section_data(s, tss,
1298
                                   p, p_end - p, 1);
1299
            }
1300
        } else {
1301
            if (cc_ok) {
1302
                write_section_data(s, tss,
1303
                                   p, p_end - p, 0);
1304
            }
1305
        }
1306
    } else {
1307
        int ret;
1308
        // Note: The position here points actually behind the current packet.
1309
        if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1310
                                            pos - ts->raw_packet_size)) < 0)
1311
            return ret;
1312
    }
1313

    
1314
    return 0;
1315
}
1316

    
1317
/* XXX: try to find a better synchro over several packets (use
1318
   get_packet_size() ?) */
1319
static int mpegts_resync(AVFormatContext *s)
1320
{
1321
    AVIOContext *pb = s->pb;
1322
    int c, i;
1323

    
1324
    for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1325
        c = avio_r8(pb);
1326
        if (url_feof(pb))
1327
            return -1;
1328
        if (c == 0x47) {
1329
            avio_seek(pb, -1, SEEK_CUR);
1330
            return 0;
1331
        }
1332
    }
1333
    av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1334
    /* no sync found */
1335
    return -1;
1336
}
1337

    
1338
/* return -1 if error or EOF. Return 0 if OK. */
1339
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1340
{
1341
    AVIOContext *pb = s->pb;
1342
    int skip, len;
1343

    
1344
    for(;;) {
1345
        len = avio_read(pb, buf, TS_PACKET_SIZE);
1346
        if (len != TS_PACKET_SIZE)
1347
            return AVERROR(EIO);
1348
        /* check paquet sync byte */
1349
        if (buf[0] != 0x47) {
1350
            /* find a new packet start */
1351
            avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1352
            if (mpegts_resync(s) < 0)
1353
                return AVERROR(EAGAIN);
1354
            else
1355
                continue;
1356
        } else {
1357
            skip = raw_packet_size - TS_PACKET_SIZE;
1358
            if (skip > 0)
1359
                avio_seek(pb, skip, SEEK_CUR);
1360
            break;
1361
        }
1362
    }
1363
    return 0;
1364
}
1365

    
1366
static int handle_packets(MpegTSContext *ts, int nb_packets)
1367
{
1368
    AVFormatContext *s = ts->stream;
1369
    uint8_t packet[TS_PACKET_SIZE];
1370
    int packet_num, ret;
1371

    
1372
    ts->stop_parse = 0;
1373
    packet_num = 0;
1374
    for(;;) {
1375
        if (ts->stop_parse>0)
1376
            break;
1377
        packet_num++;
1378
        if (nb_packets != 0 && packet_num >= nb_packets)
1379
            break;
1380
        ret = read_packet(s, packet, ts->raw_packet_size);
1381
        if (ret != 0)
1382
            return ret;
1383
        ret = handle_packet(ts, packet);
1384
        if (ret != 0)
1385
            return ret;
1386
    }
1387
    return 0;
1388
}
1389

    
1390
static int mpegts_probe(AVProbeData *p)
1391
{
1392
#if 1
1393
    const int size= p->buf_size;
1394
    int score, fec_score, dvhs_score;
1395
    int check_count= size / TS_FEC_PACKET_SIZE;
1396
#define CHECK_COUNT 10
1397

    
1398
    if (check_count < CHECK_COUNT)
1399
        return -1;
1400

    
1401
    score     = analyze(p->buf, TS_PACKET_SIZE     *check_count, TS_PACKET_SIZE     , NULL)*CHECK_COUNT/check_count;
1402
    dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1403
    fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1404
//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1405

    
1406
// we need a clear definition for the returned score otherwise things will become messy sooner or later
1407
    if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
1408
    else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
1409
    else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1410
    else                                    return -1;
1411
#else
1412
    /* only use the extension for safer guess */
1413
    if (av_match_ext(p->filename, "ts"))
1414
        return AVPROBE_SCORE_MAX;
1415
    else
1416
        return 0;
1417
#endif
1418
}
1419

    
1420
/* return the 90kHz PCR and the extension for the 27MHz PCR. return
1421
   (-1) if not available */
1422
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1423
                     const uint8_t *packet)
1424
{
1425
    int afc, len, flags;
1426
    const uint8_t *p;
1427
    unsigned int v;
1428

    
1429
    afc = (packet[3] >> 4) & 3;
1430
    if (afc <= 1)
1431
        return -1;
1432
    p = packet + 4;
1433
    len = p[0];
1434
    p++;
1435
    if (len == 0)
1436
        return -1;
1437
    flags = *p++;
1438
    len--;
1439
    if (!(flags & 0x10))
1440
        return -1;
1441
    if (len < 6)
1442
        return -1;
1443
    v = AV_RB32(p);
1444
    *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1445
    *ppcr_low = ((p[4] & 1) << 8) | p[5];
1446
    return 0;
1447
}
1448

    
1449
static int mpegts_read_header(AVFormatContext *s,
1450
                              AVFormatParameters *ap)
1451
{
1452
    MpegTSContext *ts = s->priv_data;
1453
    AVIOContext *pb = s->pb;
1454
    uint8_t buf[5*1024];
1455
    int len;
1456
    int64_t pos;
1457

    
1458
    if (ap) {
1459
        ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1460
        if(ap->mpeg2ts_raw){
1461
            av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1462
            return -1;
1463
        }
1464
    }
1465

    
1466
    /* read the first 1024 bytes to get packet size */
1467
    pos = avio_tell(pb);
1468
    len = avio_read(pb, buf, sizeof(buf));
1469
    if (len != sizeof(buf))
1470
        goto fail;
1471
    ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1472
    if (ts->raw_packet_size <= 0)
1473
        goto fail;
1474
    ts->stream = s;
1475
    ts->auto_guess = 0;
1476

    
1477
    if (s->iformat == &ff_mpegts_demuxer) {
1478
        /* normal demux */
1479

    
1480
        /* first do a scaning to get all the services */
1481
        if (avio_seek(pb, pos, SEEK_SET) < 0)
1482
            av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1483

    
1484
        mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1485

    
1486
        mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1487

    
1488
        handle_packets(ts, s->probesize / ts->raw_packet_size);
1489
        /* if could not find service, enable auto_guess */
1490

    
1491
        ts->auto_guess = 1;
1492

    
1493
        av_dlog(ts->stream, "tuning done\n");
1494

    
1495
        s->ctx_flags |= AVFMTCTX_NOHEADER;
1496
    } else {
1497
        AVStream *st;
1498
        int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1499
        int64_t pcrs[2], pcr_h;
1500
        int packet_count[2];
1501
        uint8_t packet[TS_PACKET_SIZE];
1502

    
1503
        /* only read packets */
1504

    
1505
        st = av_new_stream(s, 0);
1506
        if (!st)
1507
            goto fail;
1508
        av_set_pts_info(st, 60, 1, 27000000);
1509
        st->codec->codec_type = AVMEDIA_TYPE_DATA;
1510
        st->codec->codec_id = CODEC_ID_MPEG2TS;
1511

    
1512
        /* we iterate until we find two PCRs to estimate the bitrate */
1513
        pcr_pid = -1;
1514
        nb_pcrs = 0;
1515
        nb_packets = 0;
1516
        for(;;) {
1517
            ret = read_packet(s, packet, ts->raw_packet_size);
1518
            if (ret < 0)
1519
                return -1;
1520
            pid = AV_RB16(packet + 1) & 0x1fff;
1521
            if ((pcr_pid == -1 || pcr_pid == pid) &&
1522
                parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1523
                pcr_pid = pid;
1524
                packet_count[nb_pcrs] = nb_packets;
1525
                pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1526
                nb_pcrs++;
1527
                if (nb_pcrs >= 2)
1528
                    break;
1529
            }
1530
            nb_packets++;
1531
        }
1532

    
1533
        /* NOTE1: the bitrate is computed without the FEC */
1534
        /* NOTE2: it is only the bitrate of the start of the stream */
1535
        ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1536
        ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1537
        s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1538
        st->codec->bit_rate = s->bit_rate;
1539
        st->start_time = ts->cur_pcr;
1540
#if 0
1541
        av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1542
               st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1543
#endif
1544
    }
1545

    
1546
    avio_seek(pb, pos, SEEK_SET);
1547
    return 0;
1548
 fail:
1549
    return -1;
1550
}
1551

    
1552
#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1553

    
1554
static int mpegts_raw_read_packet(AVFormatContext *s,
1555
                                  AVPacket *pkt)
1556
{
1557
    MpegTSContext *ts = s->priv_data;
1558
    int ret, i;
1559
    int64_t pcr_h, next_pcr_h, pos;
1560
    int pcr_l, next_pcr_l;
1561
    uint8_t pcr_buf[12];
1562

    
1563
    if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1564
        return AVERROR(ENOMEM);
1565
    pkt->pos= avio_tell(s->pb);
1566
    ret = read_packet(s, pkt->data, ts->raw_packet_size);
1567
    if (ret < 0) {
1568
        av_free_packet(pkt);
1569
        return ret;
1570
    }
1571
    if (ts->mpeg2ts_compute_pcr) {
1572
        /* compute exact PCR for each packet */
1573
        if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1574
            /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1575
            pos = avio_tell(s->pb);
1576
            for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1577
                avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1578
                avio_read(s->pb, pcr_buf, 12);
1579
                if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1580
                    /* XXX: not precise enough */
1581
                    ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1582
                        (i + 1);
1583
                    break;
1584
                }
1585
            }
1586
            avio_seek(s->pb, pos, SEEK_SET);
1587
            /* no next PCR found: we use previous increment */
1588
            ts->cur_pcr = pcr_h * 300 + pcr_l;
1589
        }
1590
        pkt->pts = ts->cur_pcr;
1591
        pkt->duration = ts->pcr_incr;
1592
        ts->cur_pcr += ts->pcr_incr;
1593
    }
1594
    pkt->stream_index = 0;
1595
    return 0;
1596
}
1597

    
1598
static int mpegts_read_packet(AVFormatContext *s,
1599
                              AVPacket *pkt)
1600
{
1601
    MpegTSContext *ts = s->priv_data;
1602
    int ret, i;
1603

    
1604
    if (avio_tell(s->pb) != ts->last_pos) {
1605
        /* seek detected, flush pes buffer */
1606
        for (i = 0; i < NB_PID_MAX; i++) {
1607
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1608
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1609
                av_freep(&pes->buffer);
1610
                pes->data_index = 0;
1611
                pes->state = MPEGTS_SKIP; /* skip until pes header */
1612
            }
1613
        }
1614
    }
1615

    
1616
    ts->pkt = pkt;
1617
    ret = handle_packets(ts, 0);
1618
    if (ret < 0) {
1619
        /* flush pes data left */
1620
        for (i = 0; i < NB_PID_MAX; i++) {
1621
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1622
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1623
                if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1624
                    new_pes_packet(pes, pkt);
1625
                    pes->state = MPEGTS_SKIP;
1626
                    ret = 0;
1627
                    break;
1628
                }
1629
            }
1630
        }
1631
    }
1632

    
1633
    ts->last_pos = avio_tell(s->pb);
1634

    
1635
    return ret;
1636
}
1637

    
1638
static int mpegts_read_close(AVFormatContext *s)
1639
{
1640
    MpegTSContext *ts = s->priv_data;
1641
    int i;
1642

    
1643
    clear_programs(ts);
1644

    
1645
    for(i=0;i<NB_PID_MAX;i++)
1646
        if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1647

    
1648
    return 0;
1649
}
1650

    
1651
static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1652
                              int64_t *ppos, int64_t pos_limit)
1653
{
1654
    MpegTSContext *ts = s->priv_data;
1655
    int64_t pos, timestamp;
1656
    uint8_t buf[TS_PACKET_SIZE];
1657
    int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1658
    const int find_next= 1;
1659
    pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1660
    if (find_next) {
1661
        for(;;) {
1662
            avio_seek(s->pb, pos, SEEK_SET);
1663
            if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1664
                return AV_NOPTS_VALUE;
1665
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1666
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1667
                break;
1668
            }
1669
            pos += ts->raw_packet_size;
1670
        }
1671
    } else {
1672
        for(;;) {
1673
            pos -= ts->raw_packet_size;
1674
            if (pos < 0)
1675
                return AV_NOPTS_VALUE;
1676
            avio_seek(s->pb, pos, SEEK_SET);
1677
            if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1678
                return AV_NOPTS_VALUE;
1679
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1680
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1681
                break;
1682
            }
1683
        }
1684
    }
1685
    *ppos = pos;
1686

    
1687
    return timestamp;
1688
}
1689

    
1690
#ifdef USE_SYNCPOINT_SEARCH
1691

    
1692
static int read_seek2(AVFormatContext *s,
1693
                      int stream_index,
1694
                      int64_t min_ts,
1695
                      int64_t target_ts,
1696
                      int64_t max_ts,
1697
                      int flags)
1698
{
1699
    int64_t pos;
1700

    
1701
    int64_t ts_ret, ts_adj;
1702
    int stream_index_gen_search;
1703
    AVStream *st;
1704
    AVParserState *backup;
1705

    
1706
    backup = ff_store_parser_state(s);
1707

    
1708
    // detect direction of seeking for search purposes
1709
    flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1710
             AVSEEK_FLAG_BACKWARD : 0;
1711

    
1712
    if (flags & AVSEEK_FLAG_BYTE) {
1713
        // use position directly, we will search starting from it
1714
        pos = target_ts;
1715
    } else {
1716
        // search for some position with good timestamp match
1717
        if (stream_index < 0) {
1718
            stream_index_gen_search = av_find_default_stream_index(s);
1719
            if (stream_index_gen_search < 0) {
1720
                ff_restore_parser_state(s, backup);
1721
                return -1;
1722
            }
1723

    
1724
            st = s->streams[stream_index_gen_search];
1725
            // timestamp for default must be expressed in AV_TIME_BASE units
1726
            ts_adj = av_rescale(target_ts,
1727
                                st->time_base.den,
1728
                                AV_TIME_BASE * (int64_t)st->time_base.num);
1729
        } else {
1730
            ts_adj = target_ts;
1731
            stream_index_gen_search = stream_index;
1732
        }
1733
        pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1734
                            0, INT64_MAX, -1,
1735
                            AV_NOPTS_VALUE,
1736
                            AV_NOPTS_VALUE,
1737
                            flags, &ts_ret, mpegts_get_pcr);
1738
        if (pos < 0) {
1739
            ff_restore_parser_state(s, backup);
1740
            return -1;
1741
        }
1742
    }
1743

    
1744
    // search for actual matching keyframe/starting position for all streams
1745
    if (ff_gen_syncpoint_search(s, stream_index, pos,
1746
                                min_ts, target_ts, max_ts,
1747
                                flags) < 0) {
1748
        ff_restore_parser_state(s, backup);
1749
        return -1;
1750
    }
1751

    
1752
    ff_free_parser_state(s, backup);
1753
    return 0;
1754
}
1755

    
1756
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1757
{
1758
    int ret;
1759
    if (flags & AVSEEK_FLAG_BACKWARD) {
1760
        flags &= ~AVSEEK_FLAG_BACKWARD;
1761
        ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1762
        if (ret < 0)
1763
            // for compatibility reasons, seek to the best-fitting timestamp
1764
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1765
    } else {
1766
        ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1767
        if (ret < 0)
1768
            // for compatibility reasons, seek to the best-fitting timestamp
1769
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1770
    }
1771
    return ret;
1772
}
1773

    
1774
#else
1775

    
1776
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1777
    MpegTSContext *ts = s->priv_data;
1778
    uint8_t buf[TS_PACKET_SIZE];
1779
    int64_t pos;
1780

    
1781
    if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1782
        return -1;
1783

    
1784
    pos= avio_tell(s->pb);
1785

    
1786
    for(;;) {
1787
        avio_seek(s->pb, pos, SEEK_SET);
1788
        if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1789
            return -1;
1790
//        pid = AV_RB16(buf + 1) & 0x1fff;
1791
        if(buf[1] & 0x40) break;
1792
        pos += ts->raw_packet_size;
1793
    }
1794
    avio_seek(s->pb, pos, SEEK_SET);
1795

    
1796
    return 0;
1797
}
1798

    
1799
#endif
1800

    
1801
/**************************************************************/
1802
/* parsing functions - called from other demuxers such as RTP */
1803

    
1804
MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1805
{
1806
    MpegTSContext *ts;
1807

    
1808
    ts = av_mallocz(sizeof(MpegTSContext));
1809
    if (!ts)
1810
        return NULL;
1811
    /* no stream case, currently used by RTP */
1812
    ts->raw_packet_size = TS_PACKET_SIZE;
1813
    ts->stream = s;
1814
    ts->auto_guess = 1;
1815
    return ts;
1816
}
1817

    
1818
/* return the consumed length if a packet was output, or -1 if no
1819
   packet is output */
1820
int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1821
                        const uint8_t *buf, int len)
1822
{
1823
    int len1;
1824

    
1825
    len1 = len;
1826
    ts->pkt = pkt;
1827
    ts->stop_parse = 0;
1828
    for(;;) {
1829
        if (ts->stop_parse>0)
1830
            break;
1831
        if (len < TS_PACKET_SIZE)
1832
            return -1;
1833
        if (buf[0] != 0x47) {
1834
            buf++;
1835
            len--;
1836
        } else {
1837
            handle_packet(ts, buf);
1838
            buf += TS_PACKET_SIZE;
1839
            len -= TS_PACKET_SIZE;
1840
        }
1841
    }
1842
    return len1 - len;
1843
}
1844

    
1845
void ff_mpegts_parse_close(MpegTSContext *ts)
1846
{
1847
    int i;
1848

    
1849
    for(i=0;i<NB_PID_MAX;i++)
1850
        av_free(ts->pids[i]);
1851
    av_free(ts);
1852
}
1853

    
1854
AVInputFormat ff_mpegts_demuxer = {
1855
    "mpegts",
1856
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1857
    sizeof(MpegTSContext),
1858
    mpegts_probe,
1859
    mpegts_read_header,
1860
    mpegts_read_packet,
1861
    mpegts_read_close,
1862
    read_seek,
1863
    mpegts_get_pcr,
1864
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1865
#ifdef USE_SYNCPOINT_SEARCH
1866
    .read_seek2 = read_seek2,
1867
#endif
1868
};
1869

    
1870
AVInputFormat ff_mpegtsraw_demuxer = {
1871
    "mpegtsraw",
1872
    NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1873
    sizeof(MpegTSContext),
1874
    NULL,
1875
    mpegts_read_header,
1876
    mpegts_raw_read_packet,
1877
    mpegts_read_close,
1878
    read_seek,
1879
    mpegts_get_pcr,
1880
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1881
#ifdef USE_SYNCPOINT_SEARCH
1882
    .read_seek2 = read_seek2,
1883
#endif
1884
};