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ffmpeg / libavformat / mpegtsenc.c @ 620b9df7

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1
/*
2
 * MPEG2 transport stream (aka DVB) muxer
3
 * Copyright (c) 2003 Fabrice Bellard.
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
#include "libavutil/bswap.h"
23
#include "libavutil/crc.h"
24
#include "libavcodec/mpegvideo.h"
25
#include "avformat.h"
26
#include "mpegts.h"
27

    
28
/* write DVB SI sections */
29

    
30
/*********************************************/
31
/* mpegts section writer */
32

    
33
typedef struct MpegTSSection {
34
    int pid;
35
    int cc;
36
    void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
37
    void *opaque;
38
} MpegTSSection;
39

    
40
typedef struct MpegTSService {
41
    MpegTSSection pmt; /* MPEG2 pmt table context */
42
    int sid;           /* service ID */
43
    char *name;
44
    char *provider_name;
45
    int pcr_pid;
46
    int pcr_packet_count;
47
    int pcr_packet_freq;
48
} MpegTSService;
49

    
50
typedef struct MpegTSWrite {
51
    MpegTSSection pat; /* MPEG2 pat table */
52
    MpegTSSection sdt; /* MPEG2 sdt table context */
53
    MpegTSService **services;
54
    int sdt_packet_count;
55
    int sdt_packet_freq;
56
    int pat_packet_count;
57
    int pat_packet_freq;
58
    int nb_services;
59
    int onid;
60
    int tsid;
61
    uint64_t cur_pcr;
62
    int mux_rate;
63
} MpegTSWrite;
64

    
65
/* NOTE: 4 bytes must be left at the end for the crc32 */
66
static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
67
{
68
    MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data;
69
    unsigned int crc;
70
    unsigned char packet[TS_PACKET_SIZE];
71
    const unsigned char *buf_ptr;
72
    unsigned char *q;
73
    int first, b, len1, left;
74

    
75
    crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
76
    buf[len - 4] = (crc >> 24) & 0xff;
77
    buf[len - 3] = (crc >> 16) & 0xff;
78
    buf[len - 2] = (crc >> 8) & 0xff;
79
    buf[len - 1] = (crc) & 0xff;
80

    
81
    /* send each packet */
82
    buf_ptr = buf;
83
    while (len > 0) {
84
        first = (buf == buf_ptr);
85
        q = packet;
86
        *q++ = 0x47;
87
        b = (s->pid >> 8);
88
        if (first)
89
            b |= 0x40;
90
        *q++ = b;
91
        *q++ = s->pid;
92
        *q++ = 0x10 | s->cc;
93
        s->cc = (s->cc + 1) & 0xf;
94
        if (first)
95
            *q++ = 0; /* 0 offset */
96
        len1 = TS_PACKET_SIZE - (q - packet);
97
        if (len1 > len)
98
            len1 = len;
99
        memcpy(q, buf_ptr, len1);
100
        q += len1;
101
        /* add known padding data */
102
        left = TS_PACKET_SIZE - (q - packet);
103
        if (left > 0)
104
            memset(q, 0xff, left);
105

    
106
        s->write_packet(s, packet);
107

    
108
        buf_ptr += len1;
109
        len -= len1;
110

    
111
        ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
112
    }
113
}
114

    
115
static inline void put16(uint8_t **q_ptr, int val)
116
{
117
    uint8_t *q;
118
    q = *q_ptr;
119
    *q++ = val >> 8;
120
    *q++ = val;
121
    *q_ptr = q;
122
}
123

    
124
static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
125
                          int version, int sec_num, int last_sec_num,
126
                          uint8_t *buf, int len)
127
{
128
    uint8_t section[1024], *q;
129
    unsigned int tot_len;
130

    
131
    tot_len = 3 + 5 + len + 4;
132
    /* check if not too big */
133
    if (tot_len > 1024)
134
        return -1;
135

    
136
    q = section;
137
    *q++ = tid;
138
    put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
139
    put16(&q, id);
140
    *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
141
    *q++ = sec_num;
142
    *q++ = last_sec_num;
143
    memcpy(q, buf, len);
144

    
145
    mpegts_write_section(s, section, tot_len);
146
    return 0;
147
}
148

    
149
/*********************************************/
150
/* mpegts writer */
151

    
152
#define DEFAULT_PMT_START_PID   0x1000
153
#define DEFAULT_START_PID       0x0100
154
#define DEFAULT_PROVIDER_NAME   "FFmpeg"
155
#define DEFAULT_SERVICE_NAME    "Service01"
156

    
157
/* default network id, transport stream and service identifiers */
158
#define DEFAULT_ONID            0x0001
159
#define DEFAULT_TSID            0x0001
160
#define DEFAULT_SID             0x0001
161

    
162
/* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
163
#define DEFAULT_PES_HEADER_FREQ 16
164
#define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
165

    
166
/* we retransmit the SI info at this rate */
167
#define SDT_RETRANS_TIME 500
168
#define PAT_RETRANS_TIME 100
169
#define PCR_RETRANS_TIME 20
170

    
171
typedef struct MpegTSWriteStream {
172
    struct MpegTSService *service;
173
    int pid; /* stream associated pid */
174
    int cc;
175
    int payload_index;
176
    int64_t payload_pts;
177
    int64_t payload_dts;
178
    uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
179
} MpegTSWriteStream;
180

    
181
static void mpegts_write_pat(AVFormatContext *s)
182
{
183
    MpegTSWrite *ts = s->priv_data;
184
    MpegTSService *service;
185
    uint8_t data[1012], *q;
186
    int i;
187

    
188
    q = data;
189
    for(i = 0; i < ts->nb_services; i++) {
190
        service = ts->services[i];
191
        put16(&q, service->sid);
192
        put16(&q, 0xe000 | service->pmt.pid);
193
    }
194
    mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
195
                          data, q - data);
196
}
197

    
198
static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
199
{
200
    //    MpegTSWrite *ts = s->priv_data;
201
    uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
202
    int val, stream_type, i;
203

    
204
    q = data;
205
    put16(&q, 0xe000 | service->pcr_pid);
206

    
207
    program_info_length_ptr = q;
208
    q += 2; /* patched after */
209

    
210
    /* put program info here */
211

    
212
    val = 0xf000 | (q - program_info_length_ptr - 2);
213
    program_info_length_ptr[0] = val >> 8;
214
    program_info_length_ptr[1] = val;
215

    
216
    for(i = 0; i < s->nb_streams; i++) {
217
        AVStream *st = s->streams[i];
218
        MpegTSWriteStream *ts_st = st->priv_data;
219
        switch(st->codec->codec_id) {
220
        case CODEC_ID_MPEG1VIDEO:
221
        case CODEC_ID_MPEG2VIDEO:
222
            stream_type = STREAM_TYPE_VIDEO_MPEG2;
223
            break;
224
        case CODEC_ID_MPEG4:
225
            stream_type = STREAM_TYPE_VIDEO_MPEG4;
226
            break;
227
        case CODEC_ID_H264:
228
            stream_type = STREAM_TYPE_VIDEO_H264;
229
            break;
230
        case CODEC_ID_DIRAC:
231
            stream_type = STREAM_TYPE_VIDEO_DIRAC;
232
            break;
233
        case CODEC_ID_MP2:
234
        case CODEC_ID_MP3:
235
            stream_type = STREAM_TYPE_AUDIO_MPEG1;
236
            break;
237
        case CODEC_ID_AAC:
238
            stream_type = STREAM_TYPE_AUDIO_AAC;
239
            break;
240
        case CODEC_ID_AC3:
241
            stream_type = STREAM_TYPE_AUDIO_AC3;
242
            break;
243
        default:
244
            stream_type = STREAM_TYPE_PRIVATE_DATA;
245
            break;
246
        }
247
        *q++ = stream_type;
248
        put16(&q, 0xe000 | ts_st->pid);
249
        desc_length_ptr = q;
250
        q += 2; /* patched after */
251

    
252
        /* write optional descriptors here */
253
        switch(st->codec->codec_type) {
254
        case CODEC_TYPE_AUDIO:
255
            if (strlen(st->language) == 3) {
256
                *q++ = 0x0a; /* ISO 639 language descriptor */
257
                *q++ = 4;
258
                *q++ = st->language[0];
259
                *q++ = st->language[1];
260
                *q++ = st->language[2];
261
                *q++ = 0; /* undefined type */
262
            }
263
            break;
264
        case CODEC_TYPE_SUBTITLE:
265
            {
266
                const char *language;
267
                language = st->language;
268
                if (strlen(language) != 3)
269
                    language = "eng";
270
                *q++ = 0x59;
271
                *q++ = 8;
272
                *q++ = language[0];
273
                *q++ = language[1];
274
                *q++ = language[2];
275
                *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
276
                put16(&q, 1); /* page id */
277
                put16(&q, 1); /* ancillary page id */
278
            }
279
            break;
280
        case CODEC_TYPE_VIDEO:
281
            if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
282
                *q++ = 0x05; /*MPEG-2 registration descriptor*/
283
                *q++ = 4;
284
                *q++ = 'd';
285
                *q++ = 'r';
286
                *q++ = 'a';
287
                *q++ = 'c';
288
            }
289
            break;
290
        }
291

    
292
        val = 0xf000 | (q - desc_length_ptr - 2);
293
        desc_length_ptr[0] = val >> 8;
294
        desc_length_ptr[1] = val;
295
    }
296
    mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
297
                          data, q - data);
298
}
299

    
300
/* NOTE: str == NULL is accepted for an empty string */
301
static void putstr8(uint8_t **q_ptr, const char *str)
302
{
303
    uint8_t *q;
304
    int len;
305

    
306
    q = *q_ptr;
307
    if (!str)
308
        len = 0;
309
    else
310
        len = strlen(str);
311
    *q++ = len;
312
    memcpy(q, str, len);
313
    q += len;
314
    *q_ptr = q;
315
}
316

    
317
static void mpegts_write_sdt(AVFormatContext *s)
318
{
319
    MpegTSWrite *ts = s->priv_data;
320
    MpegTSService *service;
321
    uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
322
    int i, running_status, free_ca_mode, val;
323

    
324
    q = data;
325
    put16(&q, ts->onid);
326
    *q++ = 0xff;
327
    for(i = 0; i < ts->nb_services; i++) {
328
        service = ts->services[i];
329
        put16(&q, service->sid);
330
        *q++ = 0xfc | 0x00; /* currently no EIT info */
331
        desc_list_len_ptr = q;
332
        q += 2;
333
        running_status = 4; /* running */
334
        free_ca_mode = 0;
335

    
336
        /* write only one descriptor for the service name and provider */
337
        *q++ = 0x48;
338
        desc_len_ptr = q;
339
        q++;
340
        *q++ = 0x01; /* digital television service */
341
        putstr8(&q, service->provider_name);
342
        putstr8(&q, service->name);
343
        desc_len_ptr[0] = q - desc_len_ptr - 1;
344

    
345
        /* fill descriptor length */
346
        val = (running_status << 13) | (free_ca_mode << 12) |
347
            (q - desc_list_len_ptr - 2);
348
        desc_list_len_ptr[0] = val >> 8;
349
        desc_list_len_ptr[1] = val;
350
    }
351
    mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
352
                          data, q - data);
353
}
354

    
355
static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
356
                                         int sid,
357
                                         const char *provider_name,
358
                                         const char *name)
359
{
360
    MpegTSService *service;
361

    
362
    service = av_mallocz(sizeof(MpegTSService));
363
    if (!service)
364
        return NULL;
365
    service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
366
    service->sid = sid;
367
    service->provider_name = av_strdup(provider_name);
368
    service->name = av_strdup(name);
369
    service->pcr_pid = 0x1fff;
370
    dynarray_add(&ts->services, &ts->nb_services, service);
371
    return service;
372
}
373

    
374
static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
375
{
376
    AVFormatContext *ctx = s->opaque;
377
    put_buffer(ctx->pb, packet, TS_PACKET_SIZE);
378
}
379

    
380
static int mpegts_write_header(AVFormatContext *s)
381
{
382
    MpegTSWrite *ts = s->priv_data;
383
    MpegTSWriteStream *ts_st;
384
    MpegTSService *service;
385
    AVStream *st;
386
    int i, total_bit_rate;
387
    const char *service_name;
388

    
389
    ts->tsid = DEFAULT_TSID;
390
    ts->onid = DEFAULT_ONID;
391
    /* allocate a single DVB service */
392
    service_name = s->title;
393
    if (service_name[0] == '\0')
394
        service_name = DEFAULT_SERVICE_NAME;
395
    service = mpegts_add_service(ts, DEFAULT_SID,
396
                                 DEFAULT_PROVIDER_NAME, service_name);
397
    service->pmt.write_packet = section_write_packet;
398
    service->pmt.opaque = s;
399

    
400
    ts->pat.pid = PAT_PID;
401
    ts->pat.cc = 0;
402
    ts->pat.write_packet = section_write_packet;
403
    ts->pat.opaque = s;
404

    
405
    ts->sdt.pid = SDT_PID;
406
    ts->sdt.cc = 0;
407
    ts->sdt.write_packet = section_write_packet;
408
    ts->sdt.opaque = s;
409

    
410
    /* assign pids to each stream */
411
    total_bit_rate = 0;
412
    for(i = 0;i < s->nb_streams; i++) {
413
        st = s->streams[i];
414
        ts_st = av_mallocz(sizeof(MpegTSWriteStream));
415
        if (!ts_st)
416
            goto fail;
417
        st->priv_data = ts_st;
418
        ts_st->service = service;
419
        ts_st->pid = DEFAULT_START_PID + i;
420
        ts_st->payload_pts = AV_NOPTS_VALUE;
421
        ts_st->payload_dts = AV_NOPTS_VALUE;
422
        /* update PCR pid by using the first video stream */
423
        if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
424
            service->pcr_pid == 0x1fff)
425
            service->pcr_pid = ts_st->pid;
426
        total_bit_rate += st->codec->bit_rate;
427
    }
428

    
429
    /* if no video stream, use the first stream as PCR */
430
    if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
431
        ts_st = s->streams[0]->priv_data;
432
        service->pcr_pid = ts_st->pid;
433
    }
434

    
435
    if (total_bit_rate <= 8 * 1024)
436
        total_bit_rate = 8 * 1024;
437
    service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /
438
        (TS_PACKET_SIZE * 8 * 1000);
439
    ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /
440
        (TS_PACKET_SIZE * 8 * 1000);
441
    ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /
442
        (TS_PACKET_SIZE * 8 * 1000);
443
#if 0
444
    printf("%d %d %d\n",
445
           total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
446
#endif
447

    
448
    if (s->mux_rate)
449
        ts->mux_rate = s->mux_rate;
450
    else
451
        ts->mux_rate = total_bit_rate;
452

    
453
    /* write info at the start of the file, so that it will be fast to
454
       find them */
455
    mpegts_write_sdt(s);
456
    mpegts_write_pat(s);
457
    for(i = 0; i < ts->nb_services; i++) {
458
        mpegts_write_pmt(s, ts->services[i]);
459
    }
460
    put_flush_packet(s->pb);
461

    
462
    return 0;
463

    
464
 fail:
465
    for(i = 0;i < s->nb_streams; i++) {
466
        st = s->streams[i];
467
        av_free(st->priv_data);
468
    }
469
    return -1;
470
}
471

    
472
/* send SDT, PAT and PMT tables regulary */
473
static void retransmit_si_info(AVFormatContext *s)
474
{
475
    MpegTSWrite *ts = s->priv_data;
476
    int i;
477

    
478
    if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
479
        ts->sdt_packet_count = 0;
480
        mpegts_write_sdt(s);
481
    }
482
    if (++ts->pat_packet_count == ts->pat_packet_freq) {
483
        ts->pat_packet_count = 0;
484
        mpegts_write_pat(s);
485
        for(i = 0; i < ts->nb_services; i++) {
486
            mpegts_write_pmt(s, ts->services[i]);
487
        }
488
    }
489
}
490

    
491
static void write_pts(uint8_t *q, int fourbits, int64_t pts)
492
{
493
    int val;
494

    
495
    val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
496
    *q++ = val;
497
    val = (((pts >> 15) & 0x7fff) << 1) | 1;
498
    *q++ = val >> 8;
499
    *q++ = val;
500
    val = (((pts) & 0x7fff) << 1) | 1;
501
    *q++ = val >> 8;
502
    *q++ = val;
503
}
504

    
505
/* NOTE: pes_data contains all the PES packet */
506
static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
507
                             const uint8_t *payload, int payload_size,
508
                             int64_t pts, int64_t dts)
509
{
510
    MpegTSWriteStream *ts_st = st->priv_data;
511
    MpegTSWrite *ts = s->priv_data;
512
    uint8_t buf[TS_PACKET_SIZE];
513
    uint8_t *q;
514
    int val, is_start, len, header_len, write_pcr, private_code, flags;
515
    int afc_len, stuffing_len;
516
    int64_t pcr = -1; /* avoid warning */
517

    
518
    is_start = 1;
519
    while (payload_size > 0) {
520
        retransmit_si_info(s);
521

    
522
        write_pcr = 0;
523
        if (ts_st->pid == ts_st->service->pcr_pid) {
524
            ts_st->service->pcr_packet_count++;
525
            if (ts_st->service->pcr_packet_count >=
526
                ts_st->service->pcr_packet_freq) {
527
                ts_st->service->pcr_packet_count = 0;
528
                write_pcr = 1;
529
            }
530
        }
531

    
532
        /* prepare packet header */
533
        q = buf;
534
        *q++ = 0x47;
535
        val = (ts_st->pid >> 8);
536
        if (is_start)
537
            val |= 0x40;
538
        *q++ = val;
539
        *q++ = ts_st->pid;
540
        *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
541
        ts_st->cc = (ts_st->cc + 1) & 0xf;
542
        if (write_pcr) {
543
            // add 11, pcr references the last byte of program clock reference base
544
            pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate;
545
            if (dts != AV_NOPTS_VALUE && dts < pcr)
546
                av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
547
            *q++ = 7; /* AFC length */
548
            *q++ = 0x10; /* flags: PCR present */
549
            *q++ = pcr >> 25;
550
            *q++ = pcr >> 17;
551
            *q++ = pcr >> 9;
552
            *q++ = pcr >> 1;
553
            *q++ = (pcr & 1) << 7;
554
            *q++ = 0;
555
        }
556
        if (is_start) {
557
            int pes_extension = 0;
558
            /* write PES header */
559
            *q++ = 0x00;
560
            *q++ = 0x00;
561
            *q++ = 0x01;
562
            private_code = 0;
563
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
564
                if (st->codec->codec_id == CODEC_ID_DIRAC) {
565
                    *q++ = 0xfd;
566
                } else
567
                    *q++ = 0xe0;
568
            } else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&
569
                       (st->codec->codec_id == CODEC_ID_MP2 ||
570
                        st->codec->codec_id == CODEC_ID_MP3)) {
571
                *q++ = 0xc0;
572
            } else {
573
                *q++ = 0xbd;
574
                if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
575
                    private_code = 0x20;
576
                }
577
            }
578
            header_len = 0;
579
            flags = 0;
580
            if (pts != AV_NOPTS_VALUE) {
581
                header_len += 5;
582
                flags |= 0x80;
583
            }
584
            if (dts != AV_NOPTS_VALUE && dts != pts) {
585
                header_len += 5;
586
                flags |= 0x40;
587
            }
588
            if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
589
                st->codec->codec_id == CODEC_ID_DIRAC) {
590
                /* set PES_extension_flag */
591
                pes_extension = 1;
592
                flags |= 0x01;
593

    
594
                /*
595
                * One byte for PES2 extension flag +
596
                * one byte for extension length +
597
                * one byte for extension id
598
                */
599
                header_len += 3;
600
            }
601
            len = payload_size + header_len + 3;
602
            if (private_code != 0)
603
                len++;
604
            *q++ = len >> 8;
605
            *q++ = len;
606
            val = 0x80;
607
            /* data alignment indicator is required for subtitle data */
608
            if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
609
                val |= 0x04;
610
            *q++ = val;
611
            *q++ = flags;
612
            *q++ = header_len;
613
            if (pts != AV_NOPTS_VALUE) {
614
                write_pts(q, flags >> 6, pts);
615
                q += 5;
616
            }
617
            if (dts != AV_NOPTS_VALUE && dts != pts) {
618
                write_pts(q, 1, dts);
619
                q += 5;
620
            }
621
            if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
622
                flags = 0x01;  /* set PES_extension_flag_2 */
623
                *q++ = flags;
624
                *q++ = 0x80 | 0x01;  /* marker bit + extension length */
625
                /*
626
                * Set the stream id extension flag bit to 0 and
627
                * write the extended stream id
628
                */
629
                *q++ = 0x00 | 0x60;
630
            }
631
            if (private_code != 0)
632
                *q++ = private_code;
633
            is_start = 0;
634
        }
635
        /* header size */
636
        header_len = q - buf;
637
        /* data len */
638
        len = TS_PACKET_SIZE - header_len;
639
        if (len > payload_size)
640
            len = payload_size;
641
        stuffing_len = TS_PACKET_SIZE - header_len - len;
642
        if (stuffing_len > 0) {
643
            /* add stuffing with AFC */
644
            if (buf[3] & 0x20) {
645
                /* stuffing already present: increase its size */
646
                afc_len = buf[4] + 1;
647
                memmove(buf + 4 + afc_len + stuffing_len,
648
                        buf + 4 + afc_len,
649
                        header_len - (4 + afc_len));
650
                buf[4] += stuffing_len;
651
                memset(buf + 4 + afc_len, 0xff, stuffing_len);
652
            } else {
653
                /* add stuffing */
654
                memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
655
                buf[3] |= 0x20;
656
                buf[4] = stuffing_len - 1;
657
                if (stuffing_len >= 2) {
658
                    buf[5] = 0x00;
659
                    memset(buf + 6, 0xff, stuffing_len - 2);
660
                }
661
            }
662
        }
663
        memcpy(buf + TS_PACKET_SIZE - len, payload, len);
664
        payload += len;
665
        payload_size -= len;
666
        put_buffer(s->pb, buf, TS_PACKET_SIZE);
667
        ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
668
    }
669
    put_flush_packet(s->pb);
670
}
671

    
672
static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
673
{
674
    AVStream *st = s->streams[pkt->stream_index];
675
    int size= pkt->size;
676
    uint8_t *buf= pkt->data;
677
    MpegTSWriteStream *ts_st = st->priv_data;
678
    int len, max_payload_size;
679
    const uint8_t *access_unit_index = NULL;
680
    const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
681

    
682
    if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
683
        /* for subtitle, a single PES packet must be generated */
684
        mpegts_write_pes(s, st, buf, size, pkt->pts, AV_NOPTS_VALUE);
685
        return 0;
686
    }
687

    
688
    if (st->codec->codec_id == CODEC_ID_DIRAC) {
689
        /* for Dirac, a single PES packet must be generated */
690
        mpegts_write_pes(s, st, buf, size, pkt->pts, pkt->dts);
691
        return 0;
692
    }
693
    max_payload_size = DEFAULT_PES_PAYLOAD_SIZE;
694
    if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO ||
695
        st->codec->codec_id == CODEC_ID_MPEG1VIDEO) {
696
        const uint8_t *p = pkt->data;
697
        const uint8_t *end = pkt->data+pkt->size;
698
        uint32_t state = -1;
699
        while (p < end) {
700
            p = ff_find_start_code(p, end, &state);
701
            if (state == PICTURE_START_CODE) {
702
                access_unit_index = p - 4;
703
                break;
704
            }
705
        }
706
    } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
707
        access_unit_index = pkt->data;
708
    }
709

    
710
    if (!access_unit_index) {
711
        av_log(s, AV_LOG_ERROR, "error, could not find access unit start\n");
712
        return -1;
713
    }
714

    
715
    while (size > 0) {
716
        len = max_payload_size - ts_st->payload_index;
717
        if (len > size)
718
            len = size;
719
        memcpy(ts_st->payload + ts_st->payload_index, buf, len);
720
        buf += len;
721
        size -= len;
722
        ts_st->payload_index += len;
723
        if (access_unit_index && access_unit_index < buf &&
724
            ts_st->payload_pts == AV_NOPTS_VALUE &&
725
            ts_st->payload_dts == AV_NOPTS_VALUE) {
726
            ts_st->payload_dts = pkt->dts + delay;
727
            ts_st->payload_pts = pkt->pts + delay;
728
        }
729
        if (ts_st->payload_index >= max_payload_size) {
730
            mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
731
                             ts_st->payload_pts, ts_st->payload_dts);
732
            ts_st->payload_pts = AV_NOPTS_VALUE;
733
            ts_st->payload_dts = AV_NOPTS_VALUE;
734
            ts_st->payload_index = 0;
735
            access_unit_index = NULL; // unset access unit to avoid setting pts/dts again
736
        }
737
    }
738
    return 0;
739
}
740

    
741
static int mpegts_write_end(AVFormatContext *s)
742
{
743
    MpegTSWrite *ts = s->priv_data;
744
    MpegTSWriteStream *ts_st;
745
    MpegTSService *service;
746
    AVStream *st;
747
    int i;
748

    
749
    /* flush current packets */
750
    for(i = 0; i < s->nb_streams; i++) {
751
        st = s->streams[i];
752
        ts_st = st->priv_data;
753
        if (ts_st->payload_index > 0) {
754
            mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
755
                             ts_st->payload_pts, ts_st->payload_dts);
756
        }
757
    }
758
    put_flush_packet(s->pb);
759

    
760
    for(i = 0; i < ts->nb_services; i++) {
761
        service = ts->services[i];
762
        av_freep(&service->provider_name);
763
        av_freep(&service->name);
764
        av_free(service);
765
    }
766
    av_free(ts->services);
767

    
768
    return 0;
769
}
770

    
771
AVOutputFormat mpegts_muxer = {
772
    "mpegts",
773
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
774
    "video/x-mpegts",
775
    "ts,m2t",
776
    sizeof(MpegTSWrite),
777
    CODEC_ID_MP2,
778
    CODEC_ID_MPEG2VIDEO,
779
    mpegts_write_header,
780
    mpegts_write_packet,
781
    mpegts_write_end,
782
};