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ffmpeg / libavformat / mpegts.c @ dfd2a005

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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
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
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 *
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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
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 * 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 "seek.h"
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#include "isom.h"
34

    
35
/* 1.0 second at 24Mbit/s */
36
#define MAX_SCAN_PACKETS 32000
37

    
38
/* maximum size in which we look for synchronisation if
39
   synchronisation is lost */
40
#define MAX_RESYNC_SIZE 65536
41

    
42
#define MAX_PES_PAYLOAD 200*1024
43

    
44
enum MpegTSFilterType {
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    MPEGTS_PES,
46
    MPEGTS_SECTION,
47
};
48

    
49
typedef struct MpegTSFilter MpegTSFilter;
50

    
51
typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
52

    
53
typedef struct MpegTSPESFilter {
54
    PESCallback *pes_cb;
55
    void *opaque;
56
} MpegTSPESFilter;
57

    
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typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
59

    
60
typedef void SetServiceCallback(void *opaque, int ret);
61

    
62
typedef struct MpegTSSectionFilter {
63
    int section_index;
64
    int section_h_size;
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    uint8_t *section_buf;
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    unsigned int check_crc:1;
67
    unsigned int end_of_section_reached:1;
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    SectionCallback *section_cb;
69
    void *opaque;
70
} MpegTSSectionFilter;
71

    
72
struct MpegTSFilter {
73
    int pid;
74
    int last_cc; /* last cc code (-1 if first packet) */
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    enum MpegTSFilterType type;
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    union {
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        MpegTSPESFilter pes_filter;
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        MpegTSSectionFilter section_filter;
79
    } u;
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};
81

    
82
#define MAX_PIDS_PER_PROGRAM 64
83
struct Program {
84
    unsigned int id; //program id/service id
85
    unsigned int nb_pids;
86
    unsigned int pids[MAX_PIDS_PER_PROGRAM];
87
};
88

    
89
struct MpegTSContext {
90
    /* user data */
91
    AVFormatContext *stream;
92
    /** raw packet size, including FEC if present            */
93
    int raw_packet_size;
94

    
95
    int pos47;
96

    
97
    /** if true, all pids are analyzed to find streams       */
98
    int auto_guess;
99

    
100
    /** compute exact PCR for each transport stream packet   */
101
    int mpeg2ts_compute_pcr;
102

    
103
    int64_t cur_pcr;    /**< used to estimate the exact PCR  */
104
    int pcr_incr;       /**< used to estimate the exact PCR  */
105

    
106
    /* data needed to handle file based ts */
107
    /** stop parsing loop                                    */
108
    int stop_parse;
109
    /** packet containing Audio/Video data                   */
110
    AVPacket *pkt;
111
    /** to detect seek                                       */
112
    int64_t last_pos;
113

    
114
    /******************************************/
115
    /* private mpegts data */
116
    /* scan context */
117
    /** structure to keep track of Program->pids mapping     */
118
    unsigned int nb_prg;
119
    struct Program *prg;
120

    
121

    
122
    /** filters for various streams specified by PMT + for the PAT and PMT */
123
    MpegTSFilter *pids[NB_PID_MAX];
124
};
125

    
126
/* TS stream handling */
127

    
128
enum MpegTSState {
129
    MPEGTS_HEADER = 0,
130
    MPEGTS_PESHEADER,
131
    MPEGTS_PESHEADER_FILL,
132
    MPEGTS_PAYLOAD,
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    MPEGTS_SKIP,
134
};
135

    
136
/* enough for PES header + length */
137
#define PES_START_SIZE  6
138
#define PES_HEADER_SIZE 9
139
#define MAX_PES_HEADER_SIZE (9 + 255)
140

    
141
typedef struct PESContext {
142
    int pid;
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    int pcr_pid; /**< if -1 then all packets containing PCR are considered */
144
    int stream_type;
145
    MpegTSContext *ts;
146
    AVFormatContext *stream;
147
    AVStream *st;
148
    AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
149
    enum MpegTSState state;
150
    /* used to get the format */
151
    int data_index;
152
    int total_size;
153
    int pes_header_size;
154
    int extended_stream_id;
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    int64_t pts, dts;
156
    int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
157
    uint8_t header[MAX_PES_HEADER_SIZE];
158
    uint8_t *buffer;
159
} PESContext;
160

    
161
extern AVInputFormat ff_mpegts_demuxer;
162

    
163
static void clear_program(MpegTSContext *ts, unsigned int programid)
164
{
165
    int i;
166

    
167
    for(i=0; i<ts->nb_prg; i++)
168
        if(ts->prg[i].id == programid)
169
            ts->prg[i].nb_pids = 0;
170
}
171

    
172
static void clear_programs(MpegTSContext *ts)
173
{
174
    av_freep(&ts->prg);
175
    ts->nb_prg=0;
176
}
177

    
178
static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
179
{
180
    struct Program *p;
181
    void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
182
    if(!tmp)
183
        return;
184
    ts->prg = tmp;
185
    p = &ts->prg[ts->nb_prg];
186
    p->id = programid;
187
    p->nb_pids = 0;
188
    ts->nb_prg++;
189
}
190

    
191
static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
192
{
193
    int i;
194
    struct Program *p = NULL;
195
    for(i=0; i<ts->nb_prg; i++) {
196
        if(ts->prg[i].id == programid) {
197
            p = &ts->prg[i];
198
            break;
199
        }
200
    }
201
    if(!p)
202
        return;
203

    
204
    if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
205
        return;
206
    p->pids[p->nb_pids++] = pid;
207
}
208

    
209
/**
210
 * \brief discard_pid() decides if the pid is to be discarded according
211
 *                      to caller's programs selection
212
 * \param ts    : - TS context
213
 * \param pid   : - pid
214
 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
215
 *         0 otherwise
216
 */
217
static int discard_pid(MpegTSContext *ts, unsigned int pid)
218
{
219
    int i, j, k;
220
    int used = 0, discarded = 0;
221
    struct Program *p;
222
    for(i=0; i<ts->nb_prg; i++) {
223
        p = &ts->prg[i];
224
        for(j=0; j<p->nb_pids; j++) {
225
            if(p->pids[j] != pid)
226
                continue;
227
            //is program with id p->id set to be discarded?
228
            for(k=0; k<ts->stream->nb_programs; k++) {
229
                if(ts->stream->programs[k]->id == p->id) {
230
                    if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
231
                        discarded++;
232
                    else
233
                        used++;
234
                }
235
            }
236
        }
237
    }
238

    
239
    return !used && discarded;
240
}
241

    
242
/**
243
 *  Assemble PES packets out of TS packets, and then call the "section_cb"
244
 *  function when they are complete.
245
 */
246
static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
247
                               const uint8_t *buf, int buf_size, int is_start)
248
{
249
    MpegTSSectionFilter *tss = &tss1->u.section_filter;
250
    int len;
251

    
252
    if (is_start) {
253
        memcpy(tss->section_buf, buf, buf_size);
254
        tss->section_index = buf_size;
255
        tss->section_h_size = -1;
256
        tss->end_of_section_reached = 0;
257
    } else {
258
        if (tss->end_of_section_reached)
259
            return;
260
        len = 4096 - tss->section_index;
261
        if (buf_size < len)
262
            len = buf_size;
263
        memcpy(tss->section_buf + tss->section_index, buf, len);
264
        tss->section_index += len;
265
    }
266

    
267
    /* compute section length if possible */
268
    if (tss->section_h_size == -1 && tss->section_index >= 3) {
269
        len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
270
        if (len > 4096)
271
            return;
272
        tss->section_h_size = len;
273
    }
274

    
275
    if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
276
        tss->end_of_section_reached = 1;
277
        if (!tss->check_crc ||
278
            av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
279
                   tss->section_buf, tss->section_h_size) == 0)
280
            tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
281
    }
282
}
283

    
284
static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
285
                                         SectionCallback *section_cb, void *opaque,
286
                                         int check_crc)
287

    
288
{
289
    MpegTSFilter *filter;
290
    MpegTSSectionFilter *sec;
291

    
292
    av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
293

    
294
    if (pid >= NB_PID_MAX || ts->pids[pid])
295
        return NULL;
296
    filter = av_mallocz(sizeof(MpegTSFilter));
297
    if (!filter)
298
        return NULL;
299
    ts->pids[pid] = filter;
300
    filter->type = MPEGTS_SECTION;
301
    filter->pid = pid;
302
    filter->last_cc = -1;
303
    sec = &filter->u.section_filter;
304
    sec->section_cb = section_cb;
305
    sec->opaque = opaque;
306
    sec->section_buf = av_malloc(MAX_SECTION_SIZE);
307
    sec->check_crc = check_crc;
308
    if (!sec->section_buf) {
309
        av_free(filter);
310
        return NULL;
311
    }
312
    return filter;
313
}
314

    
315
static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
316
                                     PESCallback *pes_cb,
317
                                     void *opaque)
318
{
319
    MpegTSFilter *filter;
320
    MpegTSPESFilter *pes;
321

    
322
    if (pid >= NB_PID_MAX || ts->pids[pid])
323
        return NULL;
324
    filter = av_mallocz(sizeof(MpegTSFilter));
325
    if (!filter)
326
        return NULL;
327
    ts->pids[pid] = filter;
328
    filter->type = MPEGTS_PES;
329
    filter->pid = pid;
330
    filter->last_cc = -1;
331
    pes = &filter->u.pes_filter;
332
    pes->pes_cb = pes_cb;
333
    pes->opaque = opaque;
334
    return filter;
335
}
336

    
337
static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
338
{
339
    int pid;
340

    
341
    pid = filter->pid;
342
    if (filter->type == MPEGTS_SECTION)
343
        av_freep(&filter->u.section_filter.section_buf);
344
    else if (filter->type == MPEGTS_PES) {
345
        PESContext *pes = filter->u.pes_filter.opaque;
346
        av_freep(&pes->buffer);
347
        /* referenced private data will be freed later in
348
         * av_close_input_stream */
349
        if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
350
            av_freep(&filter->u.pes_filter.opaque);
351
        }
352
    }
353

    
354
    av_free(filter);
355
    ts->pids[pid] = NULL;
356
}
357

    
358
static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
359
    int stat[TS_MAX_PACKET_SIZE];
360
    int i;
361
    int x=0;
362
    int best_score=0;
363

    
364
    memset(stat, 0, packet_size*sizeof(int));
365

    
366
    for(x=i=0; i<size-3; i++){
367
        if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
368
            stat[x]++;
369
            if(stat[x] > best_score){
370
                best_score= stat[x];
371
                if(index) *index= x;
372
            }
373
        }
374

    
375
        x++;
376
        if(x == packet_size) x= 0;
377
    }
378

    
379
    return best_score;
380
}
381

    
382
/* autodetect fec presence. Must have at least 1024 bytes  */
383
static int get_packet_size(const uint8_t *buf, int size)
384
{
385
    int score, fec_score, dvhs_score;
386

    
387
    if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
388
        return -1;
389

    
390
    score    = analyze(buf, size, TS_PACKET_SIZE, NULL);
391
    dvhs_score    = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
392
    fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
393
//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
394

    
395
    if     (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
396
    else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
397
    else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
398
    else                       return -1;
399
}
400

    
401
typedef struct SectionHeader {
402
    uint8_t tid;
403
    uint16_t id;
404
    uint8_t version;
405
    uint8_t sec_num;
406
    uint8_t last_sec_num;
407
} SectionHeader;
408

    
409
static inline int get8(const uint8_t **pp, const uint8_t *p_end)
410
{
411
    const uint8_t *p;
412
    int c;
413

    
414
    p = *pp;
415
    if (p >= p_end)
416
        return -1;
417
    c = *p++;
418
    *pp = p;
419
    return c;
420
}
421

    
422
static inline int get16(const uint8_t **pp, const uint8_t *p_end)
423
{
424
    const uint8_t *p;
425
    int c;
426

    
427
    p = *pp;
428
    if ((p + 1) >= p_end)
429
        return -1;
430
    c = AV_RB16(p);
431
    p += 2;
432
    *pp = p;
433
    return c;
434
}
435

    
436
/* read and allocate a DVB string preceeded by its length */
437
static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
438
{
439
    int len;
440
    const uint8_t *p;
441
    char *str;
442

    
443
    p = *pp;
444
    len = get8(&p, p_end);
445
    if (len < 0)
446
        return NULL;
447
    if ((p + len) > p_end)
448
        return NULL;
449
    str = av_malloc(len + 1);
450
    if (!str)
451
        return NULL;
452
    memcpy(str, p, len);
453
    str[len] = '\0';
454
    p += len;
455
    *pp = p;
456
    return str;
457
}
458

    
459
static int parse_section_header(SectionHeader *h,
460
                                const uint8_t **pp, const uint8_t *p_end)
461
{
462
    int val;
463

    
464
    val = get8(pp, p_end);
465
    if (val < 0)
466
        return -1;
467
    h->tid = val;
468
    *pp += 2;
469
    val = get16(pp, p_end);
470
    if (val < 0)
471
        return -1;
472
    h->id = val;
473
    val = get8(pp, p_end);
474
    if (val < 0)
475
        return -1;
476
    h->version = (val >> 1) & 0x1f;
477
    val = get8(pp, p_end);
478
    if (val < 0)
479
        return -1;
480
    h->sec_num = val;
481
    val = get8(pp, p_end);
482
    if (val < 0)
483
        return -1;
484
    h->last_sec_num = val;
485
    return 0;
486
}
487

    
488
typedef struct {
489
    uint32_t stream_type;
490
    enum AVMediaType codec_type;
491
    enum CodecID codec_id;
492
} StreamType;
493

    
494
static const StreamType ISO_types[] = {
495
    { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
496
    { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
497
    { 0x03, AVMEDIA_TYPE_AUDIO,        CODEC_ID_MP3 },
498
    { 0x04, AVMEDIA_TYPE_AUDIO,        CODEC_ID_MP3 },
499
    { 0x0f, AVMEDIA_TYPE_AUDIO,        CODEC_ID_AAC },
500
    { 0x10, AVMEDIA_TYPE_VIDEO,      CODEC_ID_MPEG4 },
501
    { 0x11, AVMEDIA_TYPE_AUDIO,   CODEC_ID_AAC_LATM }, /* LATM syntax */
502
    { 0x1b, AVMEDIA_TYPE_VIDEO,       CODEC_ID_H264 },
503
    { 0xd1, AVMEDIA_TYPE_VIDEO,      CODEC_ID_DIRAC },
504
    { 0xea, AVMEDIA_TYPE_VIDEO,        CODEC_ID_VC1 },
505
    { 0 },
506
};
507

    
508
static const StreamType HDMV_types[] = {
509
    { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
510
    { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
511
    { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
512
    { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
513
    { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
514
    { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
515
    { 0 },
516
};
517

    
518
/* ATSC ? */
519
static const StreamType MISC_types[] = {
520
    { 0x81, AVMEDIA_TYPE_AUDIO,   CODEC_ID_AC3 },
521
    { 0x8a, AVMEDIA_TYPE_AUDIO,   CODEC_ID_DTS },
522
    { 0 },
523
};
524

    
525
static const StreamType REGD_types[] = {
526
    { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
527
    { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO,   CODEC_ID_AC3 },
528
    { 0 },
529
};
530

    
531
/* descriptor present */
532
static const StreamType DESC_types[] = {
533
    { 0x6a, AVMEDIA_TYPE_AUDIO,             CODEC_ID_AC3 }, /* AC-3 descriptor */
534
    { 0x7a, AVMEDIA_TYPE_AUDIO,            CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
535
    { 0x7b, AVMEDIA_TYPE_AUDIO,             CODEC_ID_DTS },
536
    { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
537
    { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
538
    { 0 },
539
};
540

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

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

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

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

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

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

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

    
601
    return 0;
602
}
603

    
604
static int64_t get_pts(const uint8_t *p)
605
{
606
    int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
607
    pts |= (AV_RB16(p + 1) >> 1) << 15;
608
    pts |=  AV_RB16(p + 3) >> 1;
609
    return pts;
610
}
611

    
612
static void new_pes_packet(PESContext *pes, AVPacket *pkt)
613
{
614
    av_init_packet(pkt);
615

    
616
    pkt->destruct = av_destruct_packet;
617
    pkt->data = pes->buffer;
618
    pkt->size = pes->data_index;
619
    memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
620

    
621
    // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
622
    if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
623
        pkt->stream_index = pes->sub_st->index;
624
    else
625
        pkt->stream_index = pes->st->index;
626
    pkt->pts = pes->pts;
627
    pkt->dts = pes->dts;
628
    /* store position of first TS packet of this PES packet */
629
    pkt->pos = pes->ts_packet_pos;
630

    
631
    /* reset pts values */
632
    pes->pts = AV_NOPTS_VALUE;
633
    pes->dts = AV_NOPTS_VALUE;
634
    pes->buffer = NULL;
635
    pes->data_index = 0;
636
}
637

    
638
/* return non zero if a packet could be constructed */
639
static int mpegts_push_data(MpegTSFilter *filter,
640
                            const uint8_t *buf, int buf_size, int is_start,
641
                            int64_t pos)
642
{
643
    PESContext *pes = filter->u.pes_filter.opaque;
644
    MpegTSContext *ts = pes->ts;
645
    const uint8_t *p;
646
    int len, code;
647

    
648
    if(!ts->pkt)
649
        return 0;
650

    
651
    if (is_start) {
652
        if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
653
            new_pes_packet(pes, ts->pkt);
654
            ts->stop_parse = 1;
655
        }
656
        pes->state = MPEGTS_HEADER;
657
        pes->data_index = 0;
658
        pes->ts_packet_pos = pos;
659
    }
660
    p = buf;
661
    while (buf_size > 0) {
662
        switch(pes->state) {
663
        case MPEGTS_HEADER:
664
            len = PES_START_SIZE - pes->data_index;
665
            if (len > buf_size)
666
                len = buf_size;
667
            memcpy(pes->header + pes->data_index, p, len);
668
            pes->data_index += len;
669
            p += len;
670
            buf_size -= len;
671
            if (pes->data_index == PES_START_SIZE) {
672
                /* we got all the PES or section header. We can now
673
                   decide */
674
#if 0
675
                av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
676
#endif
677
                if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
678
                    pes->header[2] == 0x01) {
679
                    /* it must be an mpeg2 PES stream */
680
                    code = pes->header[3] | 0x100;
681
                    av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
682

    
683
                    if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
684
                        code == 0x1be) /* padding_stream */
685
                        goto skip;
686

    
687
#if FF_API_MAX_STREAMS
688
                    if (!pes->st && pes->stream->nb_streams == MAX_STREAMS)
689
                        goto skip;
690
#endif
691

    
692
                    /* stream not present in PMT */
693
                    if (!pes->st) {
694
                        pes->st = av_new_stream(ts->stream, pes->pid);
695
                        if (!pes->st)
696
                            return AVERROR(ENOMEM);
697
                        mpegts_set_stream_info(pes->st, pes, 0, 0);
698
                    }
699

    
700
                    pes->total_size = AV_RB16(pes->header + 4);
701
                    /* NOTE: a zero total size means the PES size is
702
                       unbounded */
703
                    if (!pes->total_size)
704
                        pes->total_size = MAX_PES_PAYLOAD;
705

    
706
                    /* allocate pes buffer */
707
                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
708
                    if (!pes->buffer)
709
                        return AVERROR(ENOMEM);
710

    
711
                    if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
712
                        code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
713
                        code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
714
                        code != 0x1f8) {                  /* ITU-T Rec. H.222.1 type E stream */
715
                        pes->state = MPEGTS_PESHEADER;
716
                        if (pes->st->codec->codec_id == CODEC_ID_NONE) {
717
                            av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
718
                                    pes->pid, pes->stream_type);
719
                            pes->st->codec->codec_id = CODEC_ID_PROBE;
720
                        }
721
                    } else {
722
                        pes->state = MPEGTS_PAYLOAD;
723
                        pes->data_index = 0;
724
                    }
725
                } else {
726
                    /* otherwise, it should be a table */
727
                    /* skip packet */
728
                skip:
729
                    pes->state = MPEGTS_SKIP;
730
                    continue;
731
                }
732
            }
733
            break;
734
            /**********************************************/
735
            /* PES packing parsing */
736
        case MPEGTS_PESHEADER:
737
            len = PES_HEADER_SIZE - pes->data_index;
738
            if (len < 0)
739
                return -1;
740
            if (len > buf_size)
741
                len = buf_size;
742
            memcpy(pes->header + pes->data_index, p, len);
743
            pes->data_index += len;
744
            p += len;
745
            buf_size -= len;
746
            if (pes->data_index == PES_HEADER_SIZE) {
747
                pes->pes_header_size = pes->header[8] + 9;
748
                pes->state = MPEGTS_PESHEADER_FILL;
749
            }
750
            break;
751
        case MPEGTS_PESHEADER_FILL:
752
            len = pes->pes_header_size - pes->data_index;
753
            if (len < 0)
754
                return -1;
755
            if (len > buf_size)
756
                len = buf_size;
757
            memcpy(pes->header + pes->data_index, p, len);
758
            pes->data_index += len;
759
            p += len;
760
            buf_size -= len;
761
            if (pes->data_index == pes->pes_header_size) {
762
                const uint8_t *r;
763
                unsigned int flags, pes_ext, skip;
764

    
765
                flags = pes->header[7];
766
                r = pes->header + 9;
767
                pes->pts = AV_NOPTS_VALUE;
768
                pes->dts = AV_NOPTS_VALUE;
769
                if ((flags & 0xc0) == 0x80) {
770
                    pes->dts = pes->pts = get_pts(r);
771
                    r += 5;
772
                } else if ((flags & 0xc0) == 0xc0) {
773
                    pes->pts = get_pts(r);
774
                    r += 5;
775
                    pes->dts = get_pts(r);
776
                    r += 5;
777
                }
778
                pes->extended_stream_id = -1;
779
                if (flags & 0x01) { /* PES extension */
780
                    pes_ext = *r++;
781
                    /* Skip PES private data, program packet sequence counter and P-STD buffer */
782
                    skip = (pes_ext >> 4) & 0xb;
783
                    skip += skip & 0x9;
784
                    r += skip;
785
                    if ((pes_ext & 0x41) == 0x01 &&
786
                        (r + 2) <= (pes->header + pes->pes_header_size)) {
787
                        /* PES extension 2 */
788
                        if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
789
                            pes->extended_stream_id = r[1];
790
                    }
791
                }
792

    
793
                /* we got the full header. We parse it and get the payload */
794
                pes->state = MPEGTS_PAYLOAD;
795
                pes->data_index = 0;
796
            }
797
            break;
798
        case MPEGTS_PAYLOAD:
799
            if (buf_size > 0 && pes->buffer) {
800
                if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
801
                    new_pes_packet(pes, ts->pkt);
802
                    pes->total_size = MAX_PES_PAYLOAD;
803
                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
804
                    if (!pes->buffer)
805
                        return AVERROR(ENOMEM);
806
                    ts->stop_parse = 1;
807
                } else if (pes->data_index == 0 && buf_size > pes->total_size) {
808
                    // pes packet size is < ts size packet and pes data is padded with 0xff
809
                    // not sure if this is legal in ts but see issue #2392
810
                    buf_size = pes->total_size;
811
                }
812
                memcpy(pes->buffer+pes->data_index, p, buf_size);
813
                pes->data_index += buf_size;
814
            }
815
            buf_size = 0;
816
            /* emit complete packets with known packet size
817
             * decreases demuxer delay for infrequent packets like subtitles from
818
             * a couple of seconds to milliseconds for properly muxed files.
819
             * total_size is the number of bytes following pes_packet_length
820
             * in the pes header, i.e. not counting the first 6 bytes */
821
            if (pes->total_size < MAX_PES_PAYLOAD &&
822
                pes->pes_header_size + pes->data_index == pes->total_size + 6) {
823
                ts->stop_parse = 1;
824
                new_pes_packet(pes, ts->pkt);
825
            }
826
            break;
827
        case MPEGTS_SKIP:
828
            buf_size = 0;
829
            break;
830
        }
831
    }
832

    
833
    return 0;
834
}
835

    
836
static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
837
{
838
    MpegTSFilter *tss;
839
    PESContext *pes;
840

    
841
    /* if no pid found, then add a pid context */
842
    pes = av_mallocz(sizeof(PESContext));
843
    if (!pes)
844
        return 0;
845
    pes->ts = ts;
846
    pes->stream = ts->stream;
847
    pes->pid = pid;
848
    pes->pcr_pid = pcr_pid;
849
    pes->state = MPEGTS_SKIP;
850
    pes->pts = AV_NOPTS_VALUE;
851
    pes->dts = AV_NOPTS_VALUE;
852
    tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
853
    if (!tss) {
854
        av_free(pes);
855
        return 0;
856
    }
857
    return pes;
858
}
859

    
860
static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
861
                         int *es_id, uint8_t **dec_config_descr,
862
                         int *dec_config_descr_size)
863
{
864
    ByteIOContext pb;
865
    int tag;
866
    unsigned len;
867

    
868
    init_put_byte(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
869

    
870
    len = ff_mp4_read_descr(s, &pb, &tag);
871
    if (tag == MP4IODescrTag) {
872
        get_be16(&pb); // ID
873
        get_byte(&pb);
874
        get_byte(&pb);
875
        get_byte(&pb);
876
        get_byte(&pb);
877
        get_byte(&pb);
878
        len = ff_mp4_read_descr(s, &pb, &tag);
879
        if (tag == MP4ESDescrTag) {
880
            *es_id = get_be16(&pb); /* ES_ID */
881
            av_dlog(s, "ES_ID %#x\n", *es_id);
882
            get_byte(&pb); /* priority */
883
            len = ff_mp4_read_descr(s, &pb, &tag);
884
            if (tag == MP4DecConfigDescrTag) {
885
                *dec_config_descr = av_malloc(len);
886
                if (!*dec_config_descr)
887
                    return AVERROR(ENOMEM);
888
                *dec_config_descr_size = len;
889
                get_buffer(&pb, *dec_config_descr, len);
890
            }
891
        }
892
    }
893
    return 0;
894
}
895

    
896
int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
897
                              const uint8_t **pp, const uint8_t *desc_list_end,
898
                              int mp4_dec_config_descr_len, int mp4_es_id, int pid,
899
                              uint8_t *mp4_dec_config_descr)
900
{
901
    const uint8_t *desc_end;
902
    int desc_len, desc_tag;
903
    char language[4];
904

    
905
    desc_tag = get8(pp, desc_list_end);
906
    if (desc_tag < 0)
907
        return -1;
908
    desc_len = get8(pp, desc_list_end);
909
    if (desc_len < 0)
910
        return -1;
911
    desc_end = *pp + desc_len;
912
    if (desc_end > desc_list_end)
913
        return -1;
914

    
915
    av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
916

    
917
    if (st->codec->codec_id == CODEC_ID_NONE &&
918
        stream_type == STREAM_TYPE_PRIVATE_DATA)
919
        mpegts_find_stream_type(st, desc_tag, DESC_types);
920

    
921
    switch(desc_tag) {
922
    case 0x1F: /* FMC descriptor */
923
        get16(pp, desc_end);
924
        if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
925
            mp4_dec_config_descr_len && mp4_es_id == pid) {
926
            ByteIOContext pb;
927
            init_put_byte(&pb, mp4_dec_config_descr,
928
                          mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
929
            ff_mp4_read_dec_config_descr(fc, st, &pb);
930
            if (st->codec->codec_id == CODEC_ID_AAC &&
931
                st->codec->extradata_size > 0)
932
                st->need_parsing = 0;
933
        }
934
        break;
935
    case 0x56: /* DVB teletext descriptor */
936
        language[0] = get8(pp, desc_end);
937
        language[1] = get8(pp, desc_end);
938
        language[2] = get8(pp, desc_end);
939
        language[3] = 0;
940
        av_metadata_set2(&st->metadata, "language", language, 0);
941
        break;
942
    case 0x59: /* subtitling descriptor */
943
        language[0] = get8(pp, desc_end);
944
        language[1] = get8(pp, desc_end);
945
        language[2] = get8(pp, desc_end);
946
        language[3] = 0;
947
        get8(pp, desc_end);
948
        if (st->codec->extradata) {
949
            if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
950
                av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
951
        } else {
952
            st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
953
            if (st->codec->extradata) {
954
                st->codec->extradata_size = 4;
955
                memcpy(st->codec->extradata, *pp, 4);
956
            }
957
        }
958
        *pp += 4;
959
        av_metadata_set2(&st->metadata, "language", language, 0);
960
        break;
961
    case 0x0a: /* ISO 639 language descriptor */
962
        language[0] = get8(pp, desc_end);
963
        language[1] = get8(pp, desc_end);
964
        language[2] = get8(pp, desc_end);
965
        language[3] = 0;
966
        av_metadata_set2(&st->metadata, "language", language, 0);
967
        break;
968
    case 0x05: /* registration descriptor */
969
        st->codec->codec_tag = bytestream_get_le32(pp);
970
        av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
971
        if (st->codec->codec_id == CODEC_ID_NONE &&
972
            stream_type == STREAM_TYPE_PRIVATE_DATA)
973
            mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
974
        break;
975
    default:
976
        break;
977
    }
978
    *pp = desc_end;
979
    return 0;
980
}
981

    
982
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
983
{
984
    MpegTSContext *ts = filter->u.section_filter.opaque;
985
    SectionHeader h1, *h = &h1;
986
    PESContext *pes;
987
    AVStream *st;
988
    const uint8_t *p, *p_end, *desc_list_end;
989
    int program_info_length, pcr_pid, pid, stream_type;
990
    int desc_list_len;
991
    uint32_t prog_reg_desc = 0; /* registration descriptor */
992
    uint8_t *mp4_dec_config_descr = NULL;
993
    int mp4_dec_config_descr_len = 0;
994
    int mp4_es_id = 0;
995

    
996
#ifdef DEBUG
997
    av_dlog(ts->stream, "PMT: len %i\n", section_len);
998
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
999
#endif
1000

    
1001
    p_end = section + section_len - 4;
1002
    p = section;
1003
    if (parse_section_header(h, &p, p_end) < 0)
1004
        return;
1005

    
1006
    av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1007
           h->id, h->sec_num, h->last_sec_num);
1008

    
1009
    if (h->tid != PMT_TID)
1010
        return;
1011

    
1012
    clear_program(ts, h->id);
1013
    pcr_pid = get16(&p, p_end) & 0x1fff;
1014
    if (pcr_pid < 0)
1015
        return;
1016
    add_pid_to_pmt(ts, h->id, pcr_pid);
1017

    
1018
    av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1019

    
1020
    program_info_length = get16(&p, p_end) & 0xfff;
1021
    if (program_info_length < 0)
1022
        return;
1023
    while(program_info_length >= 2) {
1024
        uint8_t tag, len;
1025
        tag = get8(&p, p_end);
1026
        len = get8(&p, p_end);
1027

    
1028
        av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1029

    
1030
        if(len > program_info_length - 2)
1031
            //something else is broken, exit the program_descriptors_loop
1032
            break;
1033
        program_info_length -= len + 2;
1034
        if (tag == 0x1d) { // IOD descriptor
1035
            get8(&p, p_end); // scope
1036
            get8(&p, p_end); // label
1037
            len -= 2;
1038
            mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1039
                          &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1040
        } else if (tag == 0x05 && len >= 4) { // registration descriptor
1041
            prog_reg_desc = bytestream_get_le32(&p);
1042
            len -= 4;
1043
        }
1044
        p += len;
1045
    }
1046
    p += program_info_length;
1047
    if (p >= p_end)
1048
        goto out;
1049

    
1050
    // stop parsing after pmt, we found header
1051
    if (!ts->stream->nb_streams)
1052
        ts->stop_parse = 1;
1053

    
1054
    for(;;) {
1055
        st = 0;
1056
        stream_type = get8(&p, p_end);
1057
        if (stream_type < 0)
1058
            break;
1059
        pid = get16(&p, p_end) & 0x1fff;
1060
        if (pid < 0)
1061
            break;
1062

    
1063
        /* now create ffmpeg stream */
1064
        if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1065
            pes = ts->pids[pid]->u.pes_filter.opaque;
1066
            if (!pes->st)
1067
                pes->st = av_new_stream(pes->stream, pes->pid);
1068
            st = pes->st;
1069
        } else {
1070
            if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1071
            pes = add_pes_stream(ts, pid, pcr_pid);
1072
            if (pes)
1073
                st = av_new_stream(pes->stream, pes->pid);
1074
        }
1075

    
1076
        if (!st)
1077
            goto out;
1078

    
1079
        if (!pes->stream_type)
1080
            mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1081

    
1082
        add_pid_to_pmt(ts, h->id, pid);
1083

    
1084
        ff_program_add_stream_index(ts->stream, h->id, st->index);
1085

    
1086
        desc_list_len = get16(&p, p_end) & 0xfff;
1087
        if (desc_list_len < 0)
1088
            break;
1089
        desc_list_end = p + desc_list_len;
1090
        if (desc_list_end > p_end)
1091
            break;
1092
        for(;;) {
1093
            if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1094
                mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1095
                break;
1096

    
1097
            if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1098
                ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1099
                pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1100
            }
1101
        }
1102
        p = desc_list_end;
1103
    }
1104

    
1105
 out:
1106
    av_free(mp4_dec_config_descr);
1107
}
1108

    
1109
static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1110
{
1111
    MpegTSContext *ts = filter->u.section_filter.opaque;
1112
    SectionHeader h1, *h = &h1;
1113
    const uint8_t *p, *p_end;
1114
    int sid, pmt_pid;
1115

    
1116
#ifdef DEBUG
1117
    av_dlog(ts->stream, "PAT:\n");
1118
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1119
#endif
1120
    p_end = section + section_len - 4;
1121
    p = section;
1122
    if (parse_section_header(h, &p, p_end) < 0)
1123
        return;
1124
    if (h->tid != PAT_TID)
1125
        return;
1126

    
1127
    clear_programs(ts);
1128
    for(;;) {
1129
        sid = get16(&p, p_end);
1130
        if (sid < 0)
1131
            break;
1132
        pmt_pid = get16(&p, p_end) & 0x1fff;
1133
        if (pmt_pid < 0)
1134
            break;
1135

    
1136
        av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1137

    
1138
        if (sid == 0x0000) {
1139
            /* NIT info */
1140
        } else {
1141
            av_new_program(ts->stream, sid);
1142
            if (ts->pids[pmt_pid])
1143
                mpegts_close_filter(ts, ts->pids[pmt_pid]);
1144
            mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1145
            add_pat_entry(ts, sid);
1146
            add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1147
            add_pid_to_pmt(ts, sid, pmt_pid);
1148
        }
1149
    }
1150
}
1151

    
1152
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1153
{
1154
    MpegTSContext *ts = filter->u.section_filter.opaque;
1155
    SectionHeader h1, *h = &h1;
1156
    const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1157
    int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1158
    char *name, *provider_name;
1159

    
1160
#ifdef DEBUG
1161
    av_dlog(ts->stream, "SDT:\n");
1162
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1163
#endif
1164

    
1165
    p_end = section + section_len - 4;
1166
    p = section;
1167
    if (parse_section_header(h, &p, p_end) < 0)
1168
        return;
1169
    if (h->tid != SDT_TID)
1170
        return;
1171
    onid = get16(&p, p_end);
1172
    if (onid < 0)
1173
        return;
1174
    val = get8(&p, p_end);
1175
    if (val < 0)
1176
        return;
1177
    for(;;) {
1178
        sid = get16(&p, p_end);
1179
        if (sid < 0)
1180
            break;
1181
        val = get8(&p, p_end);
1182
        if (val < 0)
1183
            break;
1184
        desc_list_len = get16(&p, p_end) & 0xfff;
1185
        if (desc_list_len < 0)
1186
            break;
1187
        desc_list_end = p + desc_list_len;
1188
        if (desc_list_end > p_end)
1189
            break;
1190
        for(;;) {
1191
            desc_tag = get8(&p, desc_list_end);
1192
            if (desc_tag < 0)
1193
                break;
1194
            desc_len = get8(&p, desc_list_end);
1195
            desc_end = p + desc_len;
1196
            if (desc_end > desc_list_end)
1197
                break;
1198

    
1199
            av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1200
                   desc_tag, desc_len);
1201

    
1202
            switch(desc_tag) {
1203
            case 0x48:
1204
                service_type = get8(&p, p_end);
1205
                if (service_type < 0)
1206
                    break;
1207
                provider_name = getstr8(&p, p_end);
1208
                if (!provider_name)
1209
                    break;
1210
                name = getstr8(&p, p_end);
1211
                if (name) {
1212
                    AVProgram *program = av_new_program(ts->stream, sid);
1213
                    if(program) {
1214
                        av_metadata_set2(&program->metadata, "service_name", name, 0);
1215
                        av_metadata_set2(&program->metadata, "service_provider", provider_name, 0);
1216
                    }
1217
                }
1218
                av_free(name);
1219
                av_free(provider_name);
1220
                break;
1221
            default:
1222
                break;
1223
            }
1224
            p = desc_end;
1225
        }
1226
        p = desc_list_end;
1227
    }
1228
}
1229

    
1230
/* handle one TS packet */
1231
static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1232
{
1233
    AVFormatContext *s = ts->stream;
1234
    MpegTSFilter *tss;
1235
    int len, pid, cc, cc_ok, afc, is_start;
1236
    const uint8_t *p, *p_end;
1237
    int64_t pos;
1238

    
1239
    pid = AV_RB16(packet + 1) & 0x1fff;
1240
    if(pid && discard_pid(ts, pid))
1241
        return 0;
1242
    is_start = packet[1] & 0x40;
1243
    tss = ts->pids[pid];
1244
    if (ts->auto_guess && tss == NULL && is_start) {
1245
        add_pes_stream(ts, pid, -1);
1246
        tss = ts->pids[pid];
1247
    }
1248
    if (!tss)
1249
        return 0;
1250

    
1251
    /* continuity check (currently not used) */
1252
    cc = (packet[3] & 0xf);
1253
    cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1254
    tss->last_cc = cc;
1255

    
1256
    /* skip adaptation field */
1257
    afc = (packet[3] >> 4) & 3;
1258
    p = packet + 4;
1259
    if (afc == 0) /* reserved value */
1260
        return 0;
1261
    if (afc == 2) /* adaptation field only */
1262
        return 0;
1263
    if (afc == 3) {
1264
        /* skip adapation field */
1265
        p += p[0] + 1;
1266
    }
1267
    /* if past the end of packet, ignore */
1268
    p_end = packet + TS_PACKET_SIZE;
1269
    if (p >= p_end)
1270
        return 0;
1271

    
1272
    pos = url_ftell(ts->stream->pb);
1273
    ts->pos47= pos % ts->raw_packet_size;
1274

    
1275
    if (tss->type == MPEGTS_SECTION) {
1276
        if (is_start) {
1277
            /* pointer field present */
1278
            len = *p++;
1279
            if (p + len > p_end)
1280
                return 0;
1281
            if (len && cc_ok) {
1282
                /* write remaining section bytes */
1283
                write_section_data(s, tss,
1284
                                   p, len, 0);
1285
                /* check whether filter has been closed */
1286
                if (!ts->pids[pid])
1287
                    return 0;
1288
            }
1289
            p += len;
1290
            if (p < p_end) {
1291
                write_section_data(s, tss,
1292
                                   p, p_end - p, 1);
1293
            }
1294
        } else {
1295
            if (cc_ok) {
1296
                write_section_data(s, tss,
1297
                                   p, p_end - p, 0);
1298
            }
1299
        }
1300
    } else {
1301
        int ret;
1302
        // Note: The position here points actually behind the current packet.
1303
        if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1304
                                            pos - ts->raw_packet_size)) < 0)
1305
            return ret;
1306
    }
1307

    
1308
    return 0;
1309
}
1310

    
1311
/* XXX: try to find a better synchro over several packets (use
1312
   get_packet_size() ?) */
1313
static int mpegts_resync(AVFormatContext *s)
1314
{
1315
    ByteIOContext *pb = s->pb;
1316
    int c, i;
1317

    
1318
    for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1319
        c = url_fgetc(pb);
1320
        if (c < 0)
1321
            return -1;
1322
        if (c == 0x47) {
1323
            url_fseek(pb, -1, SEEK_CUR);
1324
            return 0;
1325
        }
1326
    }
1327
    av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1328
    /* no sync found */
1329
    return -1;
1330
}
1331

    
1332
/* return -1 if error or EOF. Return 0 if OK. */
1333
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1334
{
1335
    ByteIOContext *pb = s->pb;
1336
    int skip, len;
1337

    
1338
    for(;;) {
1339
        len = get_buffer(pb, buf, TS_PACKET_SIZE);
1340
        if (len != TS_PACKET_SIZE)
1341
            return AVERROR(EIO);
1342
        /* check paquet sync byte */
1343
        if (buf[0] != 0x47) {
1344
            /* find a new packet start */
1345
            url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1346
            if (mpegts_resync(s) < 0)
1347
                return AVERROR(EAGAIN);
1348
            else
1349
                continue;
1350
        } else {
1351
            skip = raw_packet_size - TS_PACKET_SIZE;
1352
            if (skip > 0)
1353
                url_fskip(pb, skip);
1354
            break;
1355
        }
1356
    }
1357
    return 0;
1358
}
1359

    
1360
static int handle_packets(MpegTSContext *ts, int nb_packets)
1361
{
1362
    AVFormatContext *s = ts->stream;
1363
    uint8_t packet[TS_PACKET_SIZE];
1364
    int packet_num, ret;
1365

    
1366
    ts->stop_parse = 0;
1367
    packet_num = 0;
1368
    for(;;) {
1369
        if (ts->stop_parse>0)
1370
            break;
1371
        packet_num++;
1372
        if (nb_packets != 0 && packet_num >= nb_packets)
1373
            break;
1374
        ret = read_packet(s, packet, ts->raw_packet_size);
1375
        if (ret != 0)
1376
            return ret;
1377
        ret = handle_packet(ts, packet);
1378
        if (ret != 0)
1379
            return ret;
1380
    }
1381
    return 0;
1382
}
1383

    
1384
static int mpegts_probe(AVProbeData *p)
1385
{
1386
#if 1
1387
    const int size= p->buf_size;
1388
    int score, fec_score, dvhs_score;
1389
    int check_count= size / TS_FEC_PACKET_SIZE;
1390
#define CHECK_COUNT 10
1391

    
1392
    if (check_count < CHECK_COUNT)
1393
        return -1;
1394

    
1395
    score     = analyze(p->buf, TS_PACKET_SIZE     *check_count, TS_PACKET_SIZE     , NULL)*CHECK_COUNT/check_count;
1396
    dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1397
    fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1398
//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1399

    
1400
// we need a clear definition for the returned score otherwise things will become messy sooner or later
1401
    if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
1402
    else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
1403
    else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1404
    else                                    return -1;
1405
#else
1406
    /* only use the extension for safer guess */
1407
    if (av_match_ext(p->filename, "ts"))
1408
        return AVPROBE_SCORE_MAX;
1409
    else
1410
        return 0;
1411
#endif
1412
}
1413

    
1414
/* return the 90kHz PCR and the extension for the 27MHz PCR. return
1415
   (-1) if not available */
1416
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1417
                     const uint8_t *packet)
1418
{
1419
    int afc, len, flags;
1420
    const uint8_t *p;
1421
    unsigned int v;
1422

    
1423
    afc = (packet[3] >> 4) & 3;
1424
    if (afc <= 1)
1425
        return -1;
1426
    p = packet + 4;
1427
    len = p[0];
1428
    p++;
1429
    if (len == 0)
1430
        return -1;
1431
    flags = *p++;
1432
    len--;
1433
    if (!(flags & 0x10))
1434
        return -1;
1435
    if (len < 6)
1436
        return -1;
1437
    v = AV_RB32(p);
1438
    *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1439
    *ppcr_low = ((p[4] & 1) << 8) | p[5];
1440
    return 0;
1441
}
1442

    
1443
static int mpegts_read_header(AVFormatContext *s,
1444
                              AVFormatParameters *ap)
1445
{
1446
    MpegTSContext *ts = s->priv_data;
1447
    ByteIOContext *pb = s->pb;
1448
    uint8_t buf[5*1024];
1449
    int len;
1450
    int64_t pos;
1451

    
1452
    if (ap) {
1453
        ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1454
        if(ap->mpeg2ts_raw){
1455
            av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1456
            return -1;
1457
        }
1458
    }
1459

    
1460
    /* read the first 1024 bytes to get packet size */
1461
    pos = url_ftell(pb);
1462
    len = get_buffer(pb, buf, sizeof(buf));
1463
    if (len != sizeof(buf))
1464
        goto fail;
1465
    ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1466
    if (ts->raw_packet_size <= 0)
1467
        goto fail;
1468
    ts->stream = s;
1469
    ts->auto_guess = 0;
1470

    
1471
    if (s->iformat == &ff_mpegts_demuxer) {
1472
        /* normal demux */
1473

    
1474
        /* first do a scaning to get all the services */
1475
        if (url_fseek(pb, pos, SEEK_SET) < 0)
1476
            av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1477

    
1478
        mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1479

    
1480
        mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1481

    
1482
        handle_packets(ts, s->probesize / ts->raw_packet_size);
1483
        /* if could not find service, enable auto_guess */
1484

    
1485
        ts->auto_guess = 1;
1486

    
1487
        av_dlog(ts->stream, "tuning done\n");
1488

    
1489
        s->ctx_flags |= AVFMTCTX_NOHEADER;
1490
    } else {
1491
        AVStream *st;
1492
        int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1493
        int64_t pcrs[2], pcr_h;
1494
        int packet_count[2];
1495
        uint8_t packet[TS_PACKET_SIZE];
1496

    
1497
        /* only read packets */
1498

    
1499
        st = av_new_stream(s, 0);
1500
        if (!st)
1501
            goto fail;
1502
        av_set_pts_info(st, 60, 1, 27000000);
1503
        st->codec->codec_type = AVMEDIA_TYPE_DATA;
1504
        st->codec->codec_id = CODEC_ID_MPEG2TS;
1505

    
1506
        /* we iterate until we find two PCRs to estimate the bitrate */
1507
        pcr_pid = -1;
1508
        nb_pcrs = 0;
1509
        nb_packets = 0;
1510
        for(;;) {
1511
            ret = read_packet(s, packet, ts->raw_packet_size);
1512
            if (ret < 0)
1513
                return -1;
1514
            pid = AV_RB16(packet + 1) & 0x1fff;
1515
            if ((pcr_pid == -1 || pcr_pid == pid) &&
1516
                parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1517
                pcr_pid = pid;
1518
                packet_count[nb_pcrs] = nb_packets;
1519
                pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1520
                nb_pcrs++;
1521
                if (nb_pcrs >= 2)
1522
                    break;
1523
            }
1524
            nb_packets++;
1525
        }
1526

    
1527
        /* NOTE1: the bitrate is computed without the FEC */
1528
        /* NOTE2: it is only the bitrate of the start of the stream */
1529
        ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1530
        ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1531
        s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1532
        st->codec->bit_rate = s->bit_rate;
1533
        st->start_time = ts->cur_pcr;
1534
#if 0
1535
        av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1536
               st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1537
#endif
1538
    }
1539

    
1540
    url_fseek(pb, pos, SEEK_SET);
1541
    return 0;
1542
 fail:
1543
    return -1;
1544
}
1545

    
1546
#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1547

    
1548
static int mpegts_raw_read_packet(AVFormatContext *s,
1549
                                  AVPacket *pkt)
1550
{
1551
    MpegTSContext *ts = s->priv_data;
1552
    int ret, i;
1553
    int64_t pcr_h, next_pcr_h, pos;
1554
    int pcr_l, next_pcr_l;
1555
    uint8_t pcr_buf[12];
1556

    
1557
    if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1558
        return AVERROR(ENOMEM);
1559
    pkt->pos= url_ftell(s->pb);
1560
    ret = read_packet(s, pkt->data, ts->raw_packet_size);
1561
    if (ret < 0) {
1562
        av_free_packet(pkt);
1563
        return ret;
1564
    }
1565
    if (ts->mpeg2ts_compute_pcr) {
1566
        /* compute exact PCR for each packet */
1567
        if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1568
            /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1569
            pos = url_ftell(s->pb);
1570
            for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1571
                url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1572
                get_buffer(s->pb, pcr_buf, 12);
1573
                if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1574
                    /* XXX: not precise enough */
1575
                    ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1576
                        (i + 1);
1577
                    break;
1578
                }
1579
            }
1580
            url_fseek(s->pb, pos, SEEK_SET);
1581
            /* no next PCR found: we use previous increment */
1582
            ts->cur_pcr = pcr_h * 300 + pcr_l;
1583
        }
1584
        pkt->pts = ts->cur_pcr;
1585
        pkt->duration = ts->pcr_incr;
1586
        ts->cur_pcr += ts->pcr_incr;
1587
    }
1588
    pkt->stream_index = 0;
1589
    return 0;
1590
}
1591

    
1592
static int mpegts_read_packet(AVFormatContext *s,
1593
                              AVPacket *pkt)
1594
{
1595
    MpegTSContext *ts = s->priv_data;
1596
    int ret, i;
1597

    
1598
    if (url_ftell(s->pb) != ts->last_pos) {
1599
        /* seek detected, flush pes buffer */
1600
        for (i = 0; i < NB_PID_MAX; i++) {
1601
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1602
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1603
                av_freep(&pes->buffer);
1604
                pes->data_index = 0;
1605
                pes->state = MPEGTS_SKIP; /* skip until pes header */
1606
            }
1607
        }
1608
    }
1609

    
1610
    ts->pkt = pkt;
1611
    ret = handle_packets(ts, 0);
1612
    if (ret < 0) {
1613
        /* flush pes data left */
1614
        for (i = 0; i < NB_PID_MAX; i++) {
1615
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1616
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1617
                if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1618
                    new_pes_packet(pes, pkt);
1619
                    pes->state = MPEGTS_SKIP;
1620
                    ret = 0;
1621
                    break;
1622
                }
1623
            }
1624
        }
1625
    }
1626

    
1627
    ts->last_pos = url_ftell(s->pb);
1628

    
1629
    return ret;
1630
}
1631

    
1632
static int mpegts_read_close(AVFormatContext *s)
1633
{
1634
    MpegTSContext *ts = s->priv_data;
1635
    int i;
1636

    
1637
    clear_programs(ts);
1638

    
1639
    for(i=0;i<NB_PID_MAX;i++)
1640
        if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1641

    
1642
    return 0;
1643
}
1644

    
1645
static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1646
                              int64_t *ppos, int64_t pos_limit)
1647
{
1648
    MpegTSContext *ts = s->priv_data;
1649
    int64_t pos, timestamp;
1650
    uint8_t buf[TS_PACKET_SIZE];
1651
    int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1652
    const int find_next= 1;
1653
    pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1654
    if (find_next) {
1655
        for(;;) {
1656
            url_fseek(s->pb, pos, SEEK_SET);
1657
            if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1658
                return AV_NOPTS_VALUE;
1659
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1660
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1661
                break;
1662
            }
1663
            pos += ts->raw_packet_size;
1664
        }
1665
    } else {
1666
        for(;;) {
1667
            pos -= ts->raw_packet_size;
1668
            if (pos < 0)
1669
                return AV_NOPTS_VALUE;
1670
            url_fseek(s->pb, pos, SEEK_SET);
1671
            if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1672
                return AV_NOPTS_VALUE;
1673
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1674
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1675
                break;
1676
            }
1677
        }
1678
    }
1679
    *ppos = pos;
1680

    
1681
    return timestamp;
1682
}
1683

    
1684
#ifdef USE_SYNCPOINT_SEARCH
1685

    
1686
static int read_seek2(AVFormatContext *s,
1687
                      int stream_index,
1688
                      int64_t min_ts,
1689
                      int64_t target_ts,
1690
                      int64_t max_ts,
1691
                      int flags)
1692
{
1693
    int64_t pos;
1694

    
1695
    int64_t ts_ret, ts_adj;
1696
    int stream_index_gen_search;
1697
    AVStream *st;
1698
    AVParserState *backup;
1699

    
1700
    backup = ff_store_parser_state(s);
1701

    
1702
    // detect direction of seeking for search purposes
1703
    flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1704
             AVSEEK_FLAG_BACKWARD : 0;
1705

    
1706
    if (flags & AVSEEK_FLAG_BYTE) {
1707
        // use position directly, we will search starting from it
1708
        pos = target_ts;
1709
    } else {
1710
        // search for some position with good timestamp match
1711
        if (stream_index < 0) {
1712
            stream_index_gen_search = av_find_default_stream_index(s);
1713
            if (stream_index_gen_search < 0) {
1714
                ff_restore_parser_state(s, backup);
1715
                return -1;
1716
            }
1717

    
1718
            st = s->streams[stream_index_gen_search];
1719
            // timestamp for default must be expressed in AV_TIME_BASE units
1720
            ts_adj = av_rescale(target_ts,
1721
                                st->time_base.den,
1722
                                AV_TIME_BASE * (int64_t)st->time_base.num);
1723
        } else {
1724
            ts_adj = target_ts;
1725
            stream_index_gen_search = stream_index;
1726
        }
1727
        pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1728
                            0, INT64_MAX, -1,
1729
                            AV_NOPTS_VALUE,
1730
                            AV_NOPTS_VALUE,
1731
                            flags, &ts_ret, mpegts_get_pcr);
1732
        if (pos < 0) {
1733
            ff_restore_parser_state(s, backup);
1734
            return -1;
1735
        }
1736
    }
1737

    
1738
    // search for actual matching keyframe/starting position for all streams
1739
    if (ff_gen_syncpoint_search(s, stream_index, pos,
1740
                                min_ts, target_ts, max_ts,
1741
                                flags) < 0) {
1742
        ff_restore_parser_state(s, backup);
1743
        return -1;
1744
    }
1745

    
1746
    ff_free_parser_state(s, backup);
1747
    return 0;
1748
}
1749

    
1750
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1751
{
1752
    int ret;
1753
    if (flags & AVSEEK_FLAG_BACKWARD) {
1754
        flags &= ~AVSEEK_FLAG_BACKWARD;
1755
        ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1756
        if (ret < 0)
1757
            // for compatibility reasons, seek to the best-fitting timestamp
1758
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1759
    } else {
1760
        ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1761
        if (ret < 0)
1762
            // for compatibility reasons, seek to the best-fitting timestamp
1763
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1764
    }
1765
    return ret;
1766
}
1767

    
1768
#else
1769

    
1770
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1771
    MpegTSContext *ts = s->priv_data;
1772
    uint8_t buf[TS_PACKET_SIZE];
1773
    int64_t pos;
1774

    
1775
    if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1776
        return -1;
1777

    
1778
    pos= url_ftell(s->pb);
1779

    
1780
    for(;;) {
1781
        url_fseek(s->pb, pos, SEEK_SET);
1782
        if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1783
            return -1;
1784
//        pid = AV_RB16(buf + 1) & 0x1fff;
1785
        if(buf[1] & 0x40) break;
1786
        pos += ts->raw_packet_size;
1787
    }
1788
    url_fseek(s->pb, pos, SEEK_SET);
1789

    
1790
    return 0;
1791
}
1792

    
1793
#endif
1794

    
1795
/**************************************************************/
1796
/* parsing functions - called from other demuxers such as RTP */
1797

    
1798
MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1799
{
1800
    MpegTSContext *ts;
1801

    
1802
    ts = av_mallocz(sizeof(MpegTSContext));
1803
    if (!ts)
1804
        return NULL;
1805
    /* no stream case, currently used by RTP */
1806
    ts->raw_packet_size = TS_PACKET_SIZE;
1807
    ts->stream = s;
1808
    ts->auto_guess = 1;
1809
    return ts;
1810
}
1811

    
1812
/* return the consumed length if a packet was output, or -1 if no
1813
   packet is output */
1814
int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1815
                        const uint8_t *buf, int len)
1816
{
1817
    int len1;
1818

    
1819
    len1 = len;
1820
    ts->pkt = pkt;
1821
    ts->stop_parse = 0;
1822
    for(;;) {
1823
        if (ts->stop_parse>0)
1824
            break;
1825
        if (len < TS_PACKET_SIZE)
1826
            return -1;
1827
        if (buf[0] != 0x47) {
1828
            buf++;
1829
            len--;
1830
        } else {
1831
            handle_packet(ts, buf);
1832
            buf += TS_PACKET_SIZE;
1833
            len -= TS_PACKET_SIZE;
1834
        }
1835
    }
1836
    return len1 - len;
1837
}
1838

    
1839
void ff_mpegts_parse_close(MpegTSContext *ts)
1840
{
1841
    int i;
1842

    
1843
    for(i=0;i<NB_PID_MAX;i++)
1844
        av_free(ts->pids[i]);
1845
    av_free(ts);
1846
}
1847

    
1848
AVInputFormat ff_mpegts_demuxer = {
1849
    "mpegts",
1850
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1851
    sizeof(MpegTSContext),
1852
    mpegts_probe,
1853
    mpegts_read_header,
1854
    mpegts_read_packet,
1855
    mpegts_read_close,
1856
    read_seek,
1857
    mpegts_get_pcr,
1858
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1859
#ifdef USE_SYNCPOINT_SEARCH
1860
    .read_seek2 = read_seek2,
1861
#endif
1862
};
1863

    
1864
AVInputFormat ff_mpegtsraw_demuxer = {
1865
    "mpegtsraw",
1866
    NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1867
    sizeof(MpegTSContext),
1868
    NULL,
1869
    mpegts_read_header,
1870
    mpegts_raw_read_packet,
1871
    mpegts_read_close,
1872
    read_seek,
1873
    mpegts_get_pcr,
1874
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1875
#ifdef USE_SYNCPOINT_SEARCH
1876
    .read_seek2 = read_seek2,
1877
#endif
1878
};