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1
/*
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 * 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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 *
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 * 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.
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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"
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#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 */
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#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 {
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    PESCallback *pes_cb;
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    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) */
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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;
78
    } u;
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};
80

    
81
#define MAX_PIDS_PER_PROGRAM 64
82
struct Program {
83
    unsigned int id; //program id/service id
84
    unsigned int nb_pids;
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    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                                       */
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    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,
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    MPEGTS_SKIP,
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};
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;
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    int64_t pts, dts;
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    int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
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    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 (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
        get8(pp, desc_end);
939
        if (st->codec->extradata) {
940
            if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
941
                av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
942
        } else {
943
            st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
944
            if (st->codec->extradata) {
945
                st->codec->extradata_size = 4;
946
                memcpy(st->codec->extradata, *pp, 4);
947
            }
948
        }
949
        *pp += 4;
950
        av_metadata_set2(&st->metadata, "language", language, 0);
951
        break;
952
    case 0x0a: /* ISO 639 language descriptor */
953
        language[0] = get8(pp, desc_end);
954
        language[1] = get8(pp, desc_end);
955
        language[2] = get8(pp, desc_end);
956
        language[3] = 0;
957
        av_metadata_set2(&st->metadata, "language", language, 0);
958
        switch (get8(pp, desc_end)) {
959
            case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
960
            case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
961
            case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
962
        }
963
        break;
964
    case 0x05: /* registration descriptor */
965
        st->codec->codec_tag = bytestream_get_le32(pp);
966
        av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
967
        if (st->codec->codec_id == CODEC_ID_NONE &&
968
            stream_type == STREAM_TYPE_PRIVATE_DATA)
969
            mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
970
        break;
971
    default:
972
        break;
973
    }
974
    *pp = desc_end;
975
    return 0;
976
}
977

    
978
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
979
{
980
    MpegTSContext *ts = filter->u.section_filter.opaque;
981
    SectionHeader h1, *h = &h1;
982
    PESContext *pes;
983
    AVStream *st;
984
    const uint8_t *p, *p_end, *desc_list_end;
985
    int program_info_length, pcr_pid, pid, stream_type;
986
    int desc_list_len;
987
    uint32_t prog_reg_desc = 0; /* registration descriptor */
988
    uint8_t *mp4_dec_config_descr = NULL;
989
    int mp4_dec_config_descr_len = 0;
990
    int mp4_es_id = 0;
991

    
992
#ifdef DEBUG
993
    av_dlog(ts->stream, "PMT: len %i\n", section_len);
994
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
995
#endif
996

    
997
    p_end = section + section_len - 4;
998
    p = section;
999
    if (parse_section_header(h, &p, p_end) < 0)
1000
        return;
1001

    
1002
    av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1003
           h->id, h->sec_num, h->last_sec_num);
1004

    
1005
    if (h->tid != PMT_TID)
1006
        return;
1007

    
1008
    clear_program(ts, h->id);
1009
    pcr_pid = get16(&p, p_end) & 0x1fff;
1010
    if (pcr_pid < 0)
1011
        return;
1012
    add_pid_to_pmt(ts, h->id, pcr_pid);
1013

    
1014
    av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1015

    
1016
    program_info_length = get16(&p, p_end) & 0xfff;
1017
    if (program_info_length < 0)
1018
        return;
1019
    while(program_info_length >= 2) {
1020
        uint8_t tag, len;
1021
        tag = get8(&p, p_end);
1022
        len = get8(&p, p_end);
1023

    
1024
        av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1025

    
1026
        if(len > program_info_length - 2)
1027
            //something else is broken, exit the program_descriptors_loop
1028
            break;
1029
        program_info_length -= len + 2;
1030
        if (tag == 0x1d) { // IOD descriptor
1031
            get8(&p, p_end); // scope
1032
            get8(&p, p_end); // label
1033
            len -= 2;
1034
            mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1035
                          &mp4_dec_config_descr, &mp4_dec_config_descr_len);
1036
        } else if (tag == 0x05 && len >= 4) { // registration descriptor
1037
            prog_reg_desc = bytestream_get_le32(&p);
1038
            len -= 4;
1039
        }
1040
        p += len;
1041
    }
1042
    p += program_info_length;
1043
    if (p >= p_end)
1044
        goto out;
1045

    
1046
    // stop parsing after pmt, we found header
1047
    if (!ts->stream->nb_streams)
1048
        ts->stop_parse = 1;
1049

    
1050
    for(;;) {
1051
        st = 0;
1052
        stream_type = get8(&p, p_end);
1053
        if (stream_type < 0)
1054
            break;
1055
        pid = get16(&p, p_end) & 0x1fff;
1056
        if (pid < 0)
1057
            break;
1058

    
1059
        /* now create ffmpeg stream */
1060
        if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1061
            pes = ts->pids[pid]->u.pes_filter.opaque;
1062
            if (!pes->st)
1063
                pes->st = av_new_stream(pes->stream, pes->pid);
1064
            st = pes->st;
1065
        } else {
1066
            if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1067
            pes = add_pes_stream(ts, pid, pcr_pid);
1068
            if (pes)
1069
                st = av_new_stream(pes->stream, pes->pid);
1070
        }
1071

    
1072
        if (!st)
1073
            goto out;
1074

    
1075
        if (!pes->stream_type)
1076
            mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1077

    
1078
        add_pid_to_pmt(ts, h->id, pid);
1079

    
1080
        ff_program_add_stream_index(ts->stream, h->id, st->index);
1081

    
1082
        desc_list_len = get16(&p, p_end) & 0xfff;
1083
        if (desc_list_len < 0)
1084
            break;
1085
        desc_list_end = p + desc_list_len;
1086
        if (desc_list_end > p_end)
1087
            break;
1088
        for(;;) {
1089
            if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1090
                mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1091
                break;
1092

    
1093
            if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1094
                ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1095
                pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1096
            }
1097
        }
1098
        p = desc_list_end;
1099
    }
1100

    
1101
 out:
1102
    av_free(mp4_dec_config_descr);
1103
}
1104

    
1105
static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1106
{
1107
    MpegTSContext *ts = filter->u.section_filter.opaque;
1108
    SectionHeader h1, *h = &h1;
1109
    const uint8_t *p, *p_end;
1110
    int sid, pmt_pid;
1111

    
1112
#ifdef DEBUG
1113
    av_dlog(ts->stream, "PAT:\n");
1114
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1115
#endif
1116
    p_end = section + section_len - 4;
1117
    p = section;
1118
    if (parse_section_header(h, &p, p_end) < 0)
1119
        return;
1120
    if (h->tid != PAT_TID)
1121
        return;
1122

    
1123
    clear_programs(ts);
1124
    for(;;) {
1125
        sid = get16(&p, p_end);
1126
        if (sid < 0)
1127
            break;
1128
        pmt_pid = get16(&p, p_end) & 0x1fff;
1129
        if (pmt_pid < 0)
1130
            break;
1131

    
1132
        av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1133

    
1134
        if (sid == 0x0000) {
1135
            /* NIT info */
1136
        } else {
1137
            av_new_program(ts->stream, sid);
1138
            if (ts->pids[pmt_pid])
1139
                mpegts_close_filter(ts, ts->pids[pmt_pid]);
1140
            mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1141
            add_pat_entry(ts, sid);
1142
            add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1143
            add_pid_to_pmt(ts, sid, pmt_pid);
1144
        }
1145
    }
1146
}
1147

    
1148
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1149
{
1150
    MpegTSContext *ts = filter->u.section_filter.opaque;
1151
    SectionHeader h1, *h = &h1;
1152
    const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1153
    int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1154
    char *name, *provider_name;
1155

    
1156
#ifdef DEBUG
1157
    av_dlog(ts->stream, "SDT:\n");
1158
    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1159
#endif
1160

    
1161
    p_end = section + section_len - 4;
1162
    p = section;
1163
    if (parse_section_header(h, &p, p_end) < 0)
1164
        return;
1165
    if (h->tid != SDT_TID)
1166
        return;
1167
    onid = get16(&p, p_end);
1168
    if (onid < 0)
1169
        return;
1170
    val = get8(&p, p_end);
1171
    if (val < 0)
1172
        return;
1173
    for(;;) {
1174
        sid = get16(&p, p_end);
1175
        if (sid < 0)
1176
            break;
1177
        val = get8(&p, p_end);
1178
        if (val < 0)
1179
            break;
1180
        desc_list_len = get16(&p, p_end) & 0xfff;
1181
        if (desc_list_len < 0)
1182
            break;
1183
        desc_list_end = p + desc_list_len;
1184
        if (desc_list_end > p_end)
1185
            break;
1186
        for(;;) {
1187
            desc_tag = get8(&p, desc_list_end);
1188
            if (desc_tag < 0)
1189
                break;
1190
            desc_len = get8(&p, desc_list_end);
1191
            desc_end = p + desc_len;
1192
            if (desc_end > desc_list_end)
1193
                break;
1194

    
1195
            av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1196
                   desc_tag, desc_len);
1197

    
1198
            switch(desc_tag) {
1199
            case 0x48:
1200
                service_type = get8(&p, p_end);
1201
                if (service_type < 0)
1202
                    break;
1203
                provider_name = getstr8(&p, p_end);
1204
                if (!provider_name)
1205
                    break;
1206
                name = getstr8(&p, p_end);
1207
                if (name) {
1208
                    AVProgram *program = av_new_program(ts->stream, sid);
1209
                    if(program) {
1210
                        av_metadata_set2(&program->metadata, "service_name", name, 0);
1211
                        av_metadata_set2(&program->metadata, "service_provider", provider_name, 0);
1212
                    }
1213
                }
1214
                av_free(name);
1215
                av_free(provider_name);
1216
                break;
1217
            default:
1218
                break;
1219
            }
1220
            p = desc_end;
1221
        }
1222
        p = desc_list_end;
1223
    }
1224
}
1225

    
1226
/* handle one TS packet */
1227
static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1228
{
1229
    AVFormatContext *s = ts->stream;
1230
    MpegTSFilter *tss;
1231
    int len, pid, cc, cc_ok, afc, is_start;
1232
    const uint8_t *p, *p_end;
1233
    int64_t pos;
1234

    
1235
    pid = AV_RB16(packet + 1) & 0x1fff;
1236
    if(pid && discard_pid(ts, pid))
1237
        return 0;
1238
    is_start = packet[1] & 0x40;
1239
    tss = ts->pids[pid];
1240
    if (ts->auto_guess && tss == NULL && is_start) {
1241
        add_pes_stream(ts, pid, -1);
1242
        tss = ts->pids[pid];
1243
    }
1244
    if (!tss)
1245
        return 0;
1246

    
1247
    /* continuity check (currently not used) */
1248
    cc = (packet[3] & 0xf);
1249
    cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1250
    tss->last_cc = cc;
1251

    
1252
    /* skip adaptation field */
1253
    afc = (packet[3] >> 4) & 3;
1254
    p = packet + 4;
1255
    if (afc == 0) /* reserved value */
1256
        return 0;
1257
    if (afc == 2) /* adaptation field only */
1258
        return 0;
1259
    if (afc == 3) {
1260
        /* skip adapation field */
1261
        p += p[0] + 1;
1262
    }
1263
    /* if past the end of packet, ignore */
1264
    p_end = packet + TS_PACKET_SIZE;
1265
    if (p >= p_end)
1266
        return 0;
1267

    
1268
    pos = url_ftell(ts->stream->pb);
1269
    ts->pos47= pos % ts->raw_packet_size;
1270

    
1271
    if (tss->type == MPEGTS_SECTION) {
1272
        if (is_start) {
1273
            /* pointer field present */
1274
            len = *p++;
1275
            if (p + len > p_end)
1276
                return 0;
1277
            if (len && cc_ok) {
1278
                /* write remaining section bytes */
1279
                write_section_data(s, tss,
1280
                                   p, len, 0);
1281
                /* check whether filter has been closed */
1282
                if (!ts->pids[pid])
1283
                    return 0;
1284
            }
1285
            p += len;
1286
            if (p < p_end) {
1287
                write_section_data(s, tss,
1288
                                   p, p_end - p, 1);
1289
            }
1290
        } else {
1291
            if (cc_ok) {
1292
                write_section_data(s, tss,
1293
                                   p, p_end - p, 0);
1294
            }
1295
        }
1296
    } else {
1297
        int ret;
1298
        // Note: The position here points actually behind the current packet.
1299
        if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1300
                                            pos - ts->raw_packet_size)) < 0)
1301
            return ret;
1302
    }
1303

    
1304
    return 0;
1305
}
1306

    
1307
/* XXX: try to find a better synchro over several packets (use
1308
   get_packet_size() ?) */
1309
static int mpegts_resync(AVFormatContext *s)
1310
{
1311
    AVIOContext *pb = s->pb;
1312
    int c, i;
1313

    
1314
    for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1315
        c = url_fgetc(pb);
1316
        if (c < 0)
1317
            return -1;
1318
        if (c == 0x47) {
1319
            url_fseek(pb, -1, SEEK_CUR);
1320
            return 0;
1321
        }
1322
    }
1323
    av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1324
    /* no sync found */
1325
    return -1;
1326
}
1327

    
1328
/* return -1 if error or EOF. Return 0 if OK. */
1329
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1330
{
1331
    AVIOContext *pb = s->pb;
1332
    int skip, len;
1333

    
1334
    for(;;) {
1335
        len = avio_read(pb, buf, TS_PACKET_SIZE);
1336
        if (len != TS_PACKET_SIZE)
1337
            return AVERROR(EIO);
1338
        /* check paquet sync byte */
1339
        if (buf[0] != 0x47) {
1340
            /* find a new packet start */
1341
            url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1342
            if (mpegts_resync(s) < 0)
1343
                return AVERROR(EAGAIN);
1344
            else
1345
                continue;
1346
        } else {
1347
            skip = raw_packet_size - TS_PACKET_SIZE;
1348
            if (skip > 0)
1349
                url_fskip(pb, skip);
1350
            break;
1351
        }
1352
    }
1353
    return 0;
1354
}
1355

    
1356
static int handle_packets(MpegTSContext *ts, int nb_packets)
1357
{
1358
    AVFormatContext *s = ts->stream;
1359
    uint8_t packet[TS_PACKET_SIZE];
1360
    int packet_num, ret;
1361

    
1362
    ts->stop_parse = 0;
1363
    packet_num = 0;
1364
    for(;;) {
1365
        if (ts->stop_parse>0)
1366
            break;
1367
        packet_num++;
1368
        if (nb_packets != 0 && packet_num >= nb_packets)
1369
            break;
1370
        ret = read_packet(s, packet, ts->raw_packet_size);
1371
        if (ret != 0)
1372
            return ret;
1373
        ret = handle_packet(ts, packet);
1374
        if (ret != 0)
1375
            return ret;
1376
    }
1377
    return 0;
1378
}
1379

    
1380
static int mpegts_probe(AVProbeData *p)
1381
{
1382
#if 1
1383
    const int size= p->buf_size;
1384
    int score, fec_score, dvhs_score;
1385
    int check_count= size / TS_FEC_PACKET_SIZE;
1386
#define CHECK_COUNT 10
1387

    
1388
    if (check_count < CHECK_COUNT)
1389
        return -1;
1390

    
1391
    score     = analyze(p->buf, TS_PACKET_SIZE     *check_count, TS_PACKET_SIZE     , NULL)*CHECK_COUNT/check_count;
1392
    dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1393
    fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1394
//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1395

    
1396
// we need a clear definition for the returned score otherwise things will become messy sooner or later
1397
    if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
1398
    else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
1399
    else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1400
    else                                    return -1;
1401
#else
1402
    /* only use the extension for safer guess */
1403
    if (av_match_ext(p->filename, "ts"))
1404
        return AVPROBE_SCORE_MAX;
1405
    else
1406
        return 0;
1407
#endif
1408
}
1409

    
1410
/* return the 90kHz PCR and the extension for the 27MHz PCR. return
1411
   (-1) if not available */
1412
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1413
                     const uint8_t *packet)
1414
{
1415
    int afc, len, flags;
1416
    const uint8_t *p;
1417
    unsigned int v;
1418

    
1419
    afc = (packet[3] >> 4) & 3;
1420
    if (afc <= 1)
1421
        return -1;
1422
    p = packet + 4;
1423
    len = p[0];
1424
    p++;
1425
    if (len == 0)
1426
        return -1;
1427
    flags = *p++;
1428
    len--;
1429
    if (!(flags & 0x10))
1430
        return -1;
1431
    if (len < 6)
1432
        return -1;
1433
    v = AV_RB32(p);
1434
    *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1435
    *ppcr_low = ((p[4] & 1) << 8) | p[5];
1436
    return 0;
1437
}
1438

    
1439
static int mpegts_read_header(AVFormatContext *s,
1440
                              AVFormatParameters *ap)
1441
{
1442
    MpegTSContext *ts = s->priv_data;
1443
    AVIOContext *pb = s->pb;
1444
    uint8_t buf[5*1024];
1445
    int len;
1446
    int64_t pos;
1447

    
1448
    if (ap) {
1449
        ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1450
        if(ap->mpeg2ts_raw){
1451
            av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1452
            return -1;
1453
        }
1454
    }
1455

    
1456
    /* read the first 1024 bytes to get packet size */
1457
    pos = url_ftell(pb);
1458
    len = avio_read(pb, buf, sizeof(buf));
1459
    if (len != sizeof(buf))
1460
        goto fail;
1461
    ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1462
    if (ts->raw_packet_size <= 0)
1463
        goto fail;
1464
    ts->stream = s;
1465
    ts->auto_guess = 0;
1466

    
1467
    if (s->iformat == &ff_mpegts_demuxer) {
1468
        /* normal demux */
1469

    
1470
        /* first do a scaning to get all the services */
1471
        if (url_fseek(pb, pos, SEEK_SET) < 0)
1472
            av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1473

    
1474
        mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1475

    
1476
        mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1477

    
1478
        handle_packets(ts, s->probesize / ts->raw_packet_size);
1479
        /* if could not find service, enable auto_guess */
1480

    
1481
        ts->auto_guess = 1;
1482

    
1483
        av_dlog(ts->stream, "tuning done\n");
1484

    
1485
        s->ctx_flags |= AVFMTCTX_NOHEADER;
1486
    } else {
1487
        AVStream *st;
1488
        int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1489
        int64_t pcrs[2], pcr_h;
1490
        int packet_count[2];
1491
        uint8_t packet[TS_PACKET_SIZE];
1492

    
1493
        /* only read packets */
1494

    
1495
        st = av_new_stream(s, 0);
1496
        if (!st)
1497
            goto fail;
1498
        av_set_pts_info(st, 60, 1, 27000000);
1499
        st->codec->codec_type = AVMEDIA_TYPE_DATA;
1500
        st->codec->codec_id = CODEC_ID_MPEG2TS;
1501

    
1502
        /* we iterate until we find two PCRs to estimate the bitrate */
1503
        pcr_pid = -1;
1504
        nb_pcrs = 0;
1505
        nb_packets = 0;
1506
        for(;;) {
1507
            ret = read_packet(s, packet, ts->raw_packet_size);
1508
            if (ret < 0)
1509
                return -1;
1510
            pid = AV_RB16(packet + 1) & 0x1fff;
1511
            if ((pcr_pid == -1 || pcr_pid == pid) &&
1512
                parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1513
                pcr_pid = pid;
1514
                packet_count[nb_pcrs] = nb_packets;
1515
                pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1516
                nb_pcrs++;
1517
                if (nb_pcrs >= 2)
1518
                    break;
1519
            }
1520
            nb_packets++;
1521
        }
1522

    
1523
        /* NOTE1: the bitrate is computed without the FEC */
1524
        /* NOTE2: it is only the bitrate of the start of the stream */
1525
        ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1526
        ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1527
        s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1528
        st->codec->bit_rate = s->bit_rate;
1529
        st->start_time = ts->cur_pcr;
1530
#if 0
1531
        av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1532
               st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1533
#endif
1534
    }
1535

    
1536
    url_fseek(pb, pos, SEEK_SET);
1537
    return 0;
1538
 fail:
1539
    return -1;
1540
}
1541

    
1542
#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1543

    
1544
static int mpegts_raw_read_packet(AVFormatContext *s,
1545
                                  AVPacket *pkt)
1546
{
1547
    MpegTSContext *ts = s->priv_data;
1548
    int ret, i;
1549
    int64_t pcr_h, next_pcr_h, pos;
1550
    int pcr_l, next_pcr_l;
1551
    uint8_t pcr_buf[12];
1552

    
1553
    if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1554
        return AVERROR(ENOMEM);
1555
    pkt->pos= url_ftell(s->pb);
1556
    ret = read_packet(s, pkt->data, ts->raw_packet_size);
1557
    if (ret < 0) {
1558
        av_free_packet(pkt);
1559
        return ret;
1560
    }
1561
    if (ts->mpeg2ts_compute_pcr) {
1562
        /* compute exact PCR for each packet */
1563
        if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1564
            /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1565
            pos = url_ftell(s->pb);
1566
            for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1567
                url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1568
                avio_read(s->pb, pcr_buf, 12);
1569
                if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1570
                    /* XXX: not precise enough */
1571
                    ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1572
                        (i + 1);
1573
                    break;
1574
                }
1575
            }
1576
            url_fseek(s->pb, pos, SEEK_SET);
1577
            /* no next PCR found: we use previous increment */
1578
            ts->cur_pcr = pcr_h * 300 + pcr_l;
1579
        }
1580
        pkt->pts = ts->cur_pcr;
1581
        pkt->duration = ts->pcr_incr;
1582
        ts->cur_pcr += ts->pcr_incr;
1583
    }
1584
    pkt->stream_index = 0;
1585
    return 0;
1586
}
1587

    
1588
static int mpegts_read_packet(AVFormatContext *s,
1589
                              AVPacket *pkt)
1590
{
1591
    MpegTSContext *ts = s->priv_data;
1592
    int ret, i;
1593

    
1594
    if (url_ftell(s->pb) != ts->last_pos) {
1595
        /* seek detected, flush pes buffer */
1596
        for (i = 0; i < NB_PID_MAX; i++) {
1597
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1598
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1599
                av_freep(&pes->buffer);
1600
                pes->data_index = 0;
1601
                pes->state = MPEGTS_SKIP; /* skip until pes header */
1602
            }
1603
        }
1604
    }
1605

    
1606
    ts->pkt = pkt;
1607
    ret = handle_packets(ts, 0);
1608
    if (ret < 0) {
1609
        /* flush pes data left */
1610
        for (i = 0; i < NB_PID_MAX; i++) {
1611
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1612
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1613
                if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1614
                    new_pes_packet(pes, pkt);
1615
                    pes->state = MPEGTS_SKIP;
1616
                    ret = 0;
1617
                    break;
1618
                }
1619
            }
1620
        }
1621
    }
1622

    
1623
    ts->last_pos = url_ftell(s->pb);
1624

    
1625
    return ret;
1626
}
1627

    
1628
static int mpegts_read_close(AVFormatContext *s)
1629
{
1630
    MpegTSContext *ts = s->priv_data;
1631
    int i;
1632

    
1633
    clear_programs(ts);
1634

    
1635
    for(i=0;i<NB_PID_MAX;i++)
1636
        if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1637

    
1638
    return 0;
1639
}
1640

    
1641
static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1642
                              int64_t *ppos, int64_t pos_limit)
1643
{
1644
    MpegTSContext *ts = s->priv_data;
1645
    int64_t pos, timestamp;
1646
    uint8_t buf[TS_PACKET_SIZE];
1647
    int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1648
    const int find_next= 1;
1649
    pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1650
    if (find_next) {
1651
        for(;;) {
1652
            url_fseek(s->pb, pos, SEEK_SET);
1653
            if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1654
                return AV_NOPTS_VALUE;
1655
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1656
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1657
                break;
1658
            }
1659
            pos += ts->raw_packet_size;
1660
        }
1661
    } else {
1662
        for(;;) {
1663
            pos -= ts->raw_packet_size;
1664
            if (pos < 0)
1665
                return AV_NOPTS_VALUE;
1666
            url_fseek(s->pb, pos, SEEK_SET);
1667
            if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1668
                return AV_NOPTS_VALUE;
1669
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1670
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1671
                break;
1672
            }
1673
        }
1674
    }
1675
    *ppos = pos;
1676

    
1677
    return timestamp;
1678
}
1679

    
1680
#ifdef USE_SYNCPOINT_SEARCH
1681

    
1682
static int read_seek2(AVFormatContext *s,
1683
                      int stream_index,
1684
                      int64_t min_ts,
1685
                      int64_t target_ts,
1686
                      int64_t max_ts,
1687
                      int flags)
1688
{
1689
    int64_t pos;
1690

    
1691
    int64_t ts_ret, ts_adj;
1692
    int stream_index_gen_search;
1693
    AVStream *st;
1694
    AVParserState *backup;
1695

    
1696
    backup = ff_store_parser_state(s);
1697

    
1698
    // detect direction of seeking for search purposes
1699
    flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1700
             AVSEEK_FLAG_BACKWARD : 0;
1701

    
1702
    if (flags & AVSEEK_FLAG_BYTE) {
1703
        // use position directly, we will search starting from it
1704
        pos = target_ts;
1705
    } else {
1706
        // search for some position with good timestamp match
1707
        if (stream_index < 0) {
1708
            stream_index_gen_search = av_find_default_stream_index(s);
1709
            if (stream_index_gen_search < 0) {
1710
                ff_restore_parser_state(s, backup);
1711
                return -1;
1712
            }
1713

    
1714
            st = s->streams[stream_index_gen_search];
1715
            // timestamp for default must be expressed in AV_TIME_BASE units
1716
            ts_adj = av_rescale(target_ts,
1717
                                st->time_base.den,
1718
                                AV_TIME_BASE * (int64_t)st->time_base.num);
1719
        } else {
1720
            ts_adj = target_ts;
1721
            stream_index_gen_search = stream_index;
1722
        }
1723
        pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1724
                            0, INT64_MAX, -1,
1725
                            AV_NOPTS_VALUE,
1726
                            AV_NOPTS_VALUE,
1727
                            flags, &ts_ret, mpegts_get_pcr);
1728
        if (pos < 0) {
1729
            ff_restore_parser_state(s, backup);
1730
            return -1;
1731
        }
1732
    }
1733

    
1734
    // search for actual matching keyframe/starting position for all streams
1735
    if (ff_gen_syncpoint_search(s, stream_index, pos,
1736
                                min_ts, target_ts, max_ts,
1737
                                flags) < 0) {
1738
        ff_restore_parser_state(s, backup);
1739
        return -1;
1740
    }
1741

    
1742
    ff_free_parser_state(s, backup);
1743
    return 0;
1744
}
1745

    
1746
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1747
{
1748
    int ret;
1749
    if (flags & AVSEEK_FLAG_BACKWARD) {
1750
        flags &= ~AVSEEK_FLAG_BACKWARD;
1751
        ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1752
        if (ret < 0)
1753
            // for compatibility reasons, seek to the best-fitting timestamp
1754
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1755
    } else {
1756
        ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1757
        if (ret < 0)
1758
            // for compatibility reasons, seek to the best-fitting timestamp
1759
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1760
    }
1761
    return ret;
1762
}
1763

    
1764
#else
1765

    
1766
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1767
    MpegTSContext *ts = s->priv_data;
1768
    uint8_t buf[TS_PACKET_SIZE];
1769
    int64_t pos;
1770

    
1771
    if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1772
        return -1;
1773

    
1774
    pos= url_ftell(s->pb);
1775

    
1776
    for(;;) {
1777
        url_fseek(s->pb, pos, SEEK_SET);
1778
        if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1779
            return -1;
1780
//        pid = AV_RB16(buf + 1) & 0x1fff;
1781
        if(buf[1] & 0x40) break;
1782
        pos += ts->raw_packet_size;
1783
    }
1784
    url_fseek(s->pb, pos, SEEK_SET);
1785

    
1786
    return 0;
1787
}
1788

    
1789
#endif
1790

    
1791
/**************************************************************/
1792
/* parsing functions - called from other demuxers such as RTP */
1793

    
1794
MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1795
{
1796
    MpegTSContext *ts;
1797

    
1798
    ts = av_mallocz(sizeof(MpegTSContext));
1799
    if (!ts)
1800
        return NULL;
1801
    /* no stream case, currently used by RTP */
1802
    ts->raw_packet_size = TS_PACKET_SIZE;
1803
    ts->stream = s;
1804
    ts->auto_guess = 1;
1805
    return ts;
1806
}
1807

    
1808
/* return the consumed length if a packet was output, or -1 if no
1809
   packet is output */
1810
int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1811
                        const uint8_t *buf, int len)
1812
{
1813
    int len1;
1814

    
1815
    len1 = len;
1816
    ts->pkt = pkt;
1817
    ts->stop_parse = 0;
1818
    for(;;) {
1819
        if (ts->stop_parse>0)
1820
            break;
1821
        if (len < TS_PACKET_SIZE)
1822
            return -1;
1823
        if (buf[0] != 0x47) {
1824
            buf++;
1825
            len--;
1826
        } else {
1827
            handle_packet(ts, buf);
1828
            buf += TS_PACKET_SIZE;
1829
            len -= TS_PACKET_SIZE;
1830
        }
1831
    }
1832
    return len1 - len;
1833
}
1834

    
1835
void ff_mpegts_parse_close(MpegTSContext *ts)
1836
{
1837
    int i;
1838

    
1839
    for(i=0;i<NB_PID_MAX;i++)
1840
        av_free(ts->pids[i]);
1841
    av_free(ts);
1842
}
1843

    
1844
AVInputFormat ff_mpegts_demuxer = {
1845
    "mpegts",
1846
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1847
    sizeof(MpegTSContext),
1848
    mpegts_probe,
1849
    mpegts_read_header,
1850
    mpegts_read_packet,
1851
    mpegts_read_close,
1852
    read_seek,
1853
    mpegts_get_pcr,
1854
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1855
#ifdef USE_SYNCPOINT_SEARCH
1856
    .read_seek2 = read_seek2,
1857
#endif
1858
};
1859

    
1860
AVInputFormat ff_mpegtsraw_demuxer = {
1861
    "mpegtsraw",
1862
    NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1863
    sizeof(MpegTSContext),
1864
    NULL,
1865
    mpegts_read_header,
1866
    mpegts_raw_read_packet,
1867
    mpegts_read_close,
1868
    read_seek,
1869
    mpegts_get_pcr,
1870
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1871
#ifdef USE_SYNCPOINT_SEARCH
1872
    .read_seek2 = read_seek2,
1873
#endif
1874
};