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ffmpeg / libavformat / mpegtsenc.c @ 9a2cb05f

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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
 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * 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
20
 */
21

    
22
#include "libavutil/bswap.h"
23
#include "libavutil/crc.h"
24
#include "libavcodec/mpegvideo.h"
25
#include "avformat.h"
26
#include "internal.h"
27
#include "mpegts.h"
28
#include "adts.h"
29

    
30
/* write DVB SI sections */
31

    
32
/*********************************************/
33
/* mpegts section writer */
34

    
35
typedef struct MpegTSSection {
36
    int pid;
37
    int cc;
38
    void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
39
    void *opaque;
40
} MpegTSSection;
41

    
42
typedef struct MpegTSService {
43
    MpegTSSection pmt; /* MPEG2 pmt table context */
44
    int sid;           /* service ID */
45
    char *name;
46
    char *provider_name;
47
    int pcr_pid;
48
    int pcr_packet_count;
49
    int pcr_packet_period;
50
} MpegTSService;
51

    
52
typedef struct MpegTSWrite {
53
    MpegTSSection pat; /* MPEG2 pat table */
54
    MpegTSSection sdt; /* MPEG2 sdt table context */
55
    MpegTSService **services;
56
    int sdt_packet_count;
57
    int sdt_packet_period;
58
    int pat_packet_count;
59
    int pat_packet_period;
60
    int nb_services;
61
    int onid;
62
    int tsid;
63
    uint64_t cur_pcr;
64
    int mux_rate; ///< set to 1 when VBR
65
} MpegTSWrite;
66

    
67
/* NOTE: 4 bytes must be left at the end for the crc32 */
68
static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
69
{
70
    MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data;
71
    unsigned int crc;
72
    unsigned char packet[TS_PACKET_SIZE];
73
    const unsigned char *buf_ptr;
74
    unsigned char *q;
75
    int first, b, len1, left;
76

    
77
    crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
78
    buf[len - 4] = (crc >> 24) & 0xff;
79
    buf[len - 3] = (crc >> 16) & 0xff;
80
    buf[len - 2] = (crc >> 8) & 0xff;
81
    buf[len - 1] = (crc) & 0xff;
82

    
83
    /* send each packet */
84
    buf_ptr = buf;
85
    while (len > 0) {
86
        first = (buf == buf_ptr);
87
        q = packet;
88
        *q++ = 0x47;
89
        b = (s->pid >> 8);
90
        if (first)
91
            b |= 0x40;
92
        *q++ = b;
93
        *q++ = s->pid;
94
        s->cc = (s->cc + 1) & 0xf;
95
        *q++ = 0x10 | s->cc;
96
        if (first)
97
            *q++ = 0; /* 0 offset */
98
        len1 = TS_PACKET_SIZE - (q - packet);
99
        if (len1 > len)
100
            len1 = len;
101
        memcpy(q, buf_ptr, len1);
102
        q += len1;
103
        /* add known padding data */
104
        left = TS_PACKET_SIZE - (q - packet);
105
        if (left > 0)
106
            memset(q, 0xff, left);
107

    
108
        s->write_packet(s, packet);
109

    
110
        buf_ptr += len1;
111
        len -= len1;
112

    
113
        ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
114
    }
115
}
116

    
117
static inline void put16(uint8_t **q_ptr, int val)
118
{
119
    uint8_t *q;
120
    q = *q_ptr;
121
    *q++ = val >> 8;
122
    *q++ = val;
123
    *q_ptr = q;
124
}
125

    
126
static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
127
                          int version, int sec_num, int last_sec_num,
128
                          uint8_t *buf, int len)
129
{
130
    uint8_t section[1024], *q;
131
    unsigned int tot_len;
132

    
133
    tot_len = 3 + 5 + len + 4;
134
    /* check if not too big */
135
    if (tot_len > 1024)
136
        return -1;
137

    
138
    q = section;
139
    *q++ = tid;
140
    put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
141
    put16(&q, id);
142
    *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
143
    *q++ = sec_num;
144
    *q++ = last_sec_num;
145
    memcpy(q, buf, len);
146

    
147
    mpegts_write_section(s, section, tot_len);
148
    return 0;
149
}
150

    
151
/*********************************************/
152
/* mpegts writer */
153

    
154
#define DEFAULT_PMT_START_PID   0x1000
155
#define DEFAULT_START_PID       0x0100
156
#define DEFAULT_PROVIDER_NAME   "FFmpeg"
157
#define DEFAULT_SERVICE_NAME    "Service01"
158

    
159
/* default network id, transport stream and service identifiers */
160
#define DEFAULT_ONID            0x0001
161
#define DEFAULT_TSID            0x0001
162
#define DEFAULT_SID             0x0001
163

    
164
/* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
165
#define DEFAULT_PES_HEADER_FREQ 16
166
#define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
167

    
168
/* we retransmit the SI info at this rate */
169
#define SDT_RETRANS_TIME 500
170
#define PAT_RETRANS_TIME 100
171
#define PCR_RETRANS_TIME 20
172

    
173
typedef struct MpegTSWriteStream {
174
    struct MpegTSService *service;
175
    int pid; /* stream associated pid */
176
    int cc;
177
    int payload_index;
178
    int first_pts_check; ///< first pts check needed
179
    int64_t payload_pts;
180
    int64_t payload_dts;
181
    uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
182
    ADTSContext *adts;
183
} MpegTSWriteStream;
184

    
185
static void mpegts_write_pat(AVFormatContext *s)
186
{
187
    MpegTSWrite *ts = s->priv_data;
188
    MpegTSService *service;
189
    uint8_t data[1012], *q;
190
    int i;
191

    
192
    q = data;
193
    for(i = 0; i < ts->nb_services; i++) {
194
        service = ts->services[i];
195
        put16(&q, service->sid);
196
        put16(&q, 0xe000 | service->pmt.pid);
197
    }
198
    mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
199
                          data, q - data);
200
}
201

    
202
static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
203
{
204
    //    MpegTSWrite *ts = s->priv_data;
205
    uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
206
    int val, stream_type, i;
207

    
208
    q = data;
209
    put16(&q, 0xe000 | service->pcr_pid);
210

    
211
    program_info_length_ptr = q;
212
    q += 2; /* patched after */
213

    
214
    /* put program info here */
215

    
216
    val = 0xf000 | (q - program_info_length_ptr - 2);
217
    program_info_length_ptr[0] = val >> 8;
218
    program_info_length_ptr[1] = val;
219

    
220
    for(i = 0; i < s->nb_streams; i++) {
221
        AVStream *st = s->streams[i];
222
        MpegTSWriteStream *ts_st = st->priv_data;
223
        AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0);
224
        switch(st->codec->codec_id) {
225
        case CODEC_ID_MPEG1VIDEO:
226
        case CODEC_ID_MPEG2VIDEO:
227
            stream_type = STREAM_TYPE_VIDEO_MPEG2;
228
            break;
229
        case CODEC_ID_MPEG4:
230
            stream_type = STREAM_TYPE_VIDEO_MPEG4;
231
            break;
232
        case CODEC_ID_H264:
233
            stream_type = STREAM_TYPE_VIDEO_H264;
234
            break;
235
        case CODEC_ID_DIRAC:
236
            stream_type = STREAM_TYPE_VIDEO_DIRAC;
237
            break;
238
        case CODEC_ID_MP2:
239
        case CODEC_ID_MP3:
240
            stream_type = STREAM_TYPE_AUDIO_MPEG1;
241
            break;
242
        case CODEC_ID_AAC:
243
            stream_type = STREAM_TYPE_AUDIO_AAC;
244
            break;
245
        case CODEC_ID_AC3:
246
            stream_type = STREAM_TYPE_AUDIO_AC3;
247
            break;
248
        default:
249
            stream_type = STREAM_TYPE_PRIVATE_DATA;
250
            break;
251
        }
252
        *q++ = stream_type;
253
        put16(&q, 0xe000 | ts_st->pid);
254
        desc_length_ptr = q;
255
        q += 2; /* patched after */
256

    
257
        /* write optional descriptors here */
258
        switch(st->codec->codec_type) {
259
        case AVMEDIA_TYPE_AUDIO:
260
            if (lang && strlen(lang->value) == 3) {
261
                *q++ = 0x0a; /* ISO 639 language descriptor */
262
                *q++ = 4;
263
                *q++ = lang->value[0];
264
                *q++ = lang->value[1];
265
                *q++ = lang->value[2];
266
                *q++ = 0; /* undefined type */
267
            }
268
            break;
269
        case AVMEDIA_TYPE_SUBTITLE:
270
            {
271
                const char *language;
272
                language = lang && strlen(lang->value)==3 ? lang->value : "eng";
273
                *q++ = 0x59;
274
                *q++ = 8;
275
                *q++ = language[0];
276
                *q++ = language[1];
277
                *q++ = language[2];
278
                *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
279
                put16(&q, 1); /* page id */
280
                put16(&q, 1); /* ancillary page id */
281
            }
282
            break;
283
        case AVMEDIA_TYPE_VIDEO:
284
            if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
285
                *q++ = 0x05; /*MPEG-2 registration descriptor*/
286
                *q++ = 4;
287
                *q++ = 'd';
288
                *q++ = 'r';
289
                *q++ = 'a';
290
                *q++ = 'c';
291
            }
292
            break;
293
        }
294

    
295
        val = 0xf000 | (q - desc_length_ptr - 2);
296
        desc_length_ptr[0] = val >> 8;
297
        desc_length_ptr[1] = val;
298
    }
299
    mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
300
                          data, q - data);
301
}
302

    
303
/* NOTE: str == NULL is accepted for an empty string */
304
static void putstr8(uint8_t **q_ptr, const char *str)
305
{
306
    uint8_t *q;
307
    int len;
308

    
309
    q = *q_ptr;
310
    if (!str)
311
        len = 0;
312
    else
313
        len = strlen(str);
314
    *q++ = len;
315
    memcpy(q, str, len);
316
    q += len;
317
    *q_ptr = q;
318
}
319

    
320
static void mpegts_write_sdt(AVFormatContext *s)
321
{
322
    MpegTSWrite *ts = s->priv_data;
323
    MpegTSService *service;
324
    uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
325
    int i, running_status, free_ca_mode, val;
326

    
327
    q = data;
328
    put16(&q, ts->onid);
329
    *q++ = 0xff;
330
    for(i = 0; i < ts->nb_services; i++) {
331
        service = ts->services[i];
332
        put16(&q, service->sid);
333
        *q++ = 0xfc | 0x00; /* currently no EIT info */
334
        desc_list_len_ptr = q;
335
        q += 2;
336
        running_status = 4; /* running */
337
        free_ca_mode = 0;
338

    
339
        /* write only one descriptor for the service name and provider */
340
        *q++ = 0x48;
341
        desc_len_ptr = q;
342
        q++;
343
        *q++ = 0x01; /* digital television service */
344
        putstr8(&q, service->provider_name);
345
        putstr8(&q, service->name);
346
        desc_len_ptr[0] = q - desc_len_ptr - 1;
347

    
348
        /* fill descriptor length */
349
        val = (running_status << 13) | (free_ca_mode << 12) |
350
            (q - desc_list_len_ptr - 2);
351
        desc_list_len_ptr[0] = val >> 8;
352
        desc_list_len_ptr[1] = val;
353
    }
354
    mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
355
                          data, q - data);
356
}
357

    
358
static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
359
                                         int sid,
360
                                         const char *provider_name,
361
                                         const char *name)
362
{
363
    MpegTSService *service;
364

    
365
    service = av_mallocz(sizeof(MpegTSService));
366
    if (!service)
367
        return NULL;
368
    service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
369
    service->sid = sid;
370
    service->provider_name = av_strdup(provider_name);
371
    service->name = av_strdup(name);
372
    service->pcr_pid = 0x1fff;
373
    dynarray_add(&ts->services, &ts->nb_services, service);
374
    return service;
375
}
376

    
377
static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
378
{
379
    AVFormatContext *ctx = s->opaque;
380
    put_buffer(ctx->pb, packet, TS_PACKET_SIZE);
381
}
382

    
383
static int mpegts_write_header(AVFormatContext *s)
384
{
385
    MpegTSWrite *ts = s->priv_data;
386
    MpegTSWriteStream *ts_st;
387
    MpegTSService *service;
388
    AVStream *st, *pcr_st = NULL;
389
    AVMetadataTag *title;
390
    int i;
391
    const char *service_name;
392

    
393
    ts->tsid = DEFAULT_TSID;
394
    ts->onid = DEFAULT_ONID;
395
    /* allocate a single DVB service */
396
    title = av_metadata_get(s->metadata, "title", NULL, 0);
397
    service_name = title ? title->value : DEFAULT_SERVICE_NAME;
398
    service = mpegts_add_service(ts, DEFAULT_SID,
399
                                 DEFAULT_PROVIDER_NAME, service_name);
400
    service->pmt.write_packet = section_write_packet;
401
    service->pmt.opaque = s;
402
    service->pmt.cc = 15;
403

    
404
    ts->pat.pid = PAT_PID;
405
    ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
406
    ts->pat.write_packet = section_write_packet;
407
    ts->pat.opaque = s;
408

    
409
    ts->sdt.pid = SDT_PID;
410
    ts->sdt.cc = 15;
411
    ts->sdt.write_packet = section_write_packet;
412
    ts->sdt.opaque = s;
413

    
414
    /* assign pids to each stream */
415
    for(i = 0;i < s->nb_streams; i++) {
416
        st = s->streams[i];
417
        ts_st = av_mallocz(sizeof(MpegTSWriteStream));
418
        if (!ts_st)
419
            goto fail;
420
        st->priv_data = ts_st;
421
        ts_st->service = service;
422
        ts_st->pid = DEFAULT_START_PID + i;
423
        ts_st->payload_pts = AV_NOPTS_VALUE;
424
        ts_st->payload_dts = AV_NOPTS_VALUE;
425
        ts_st->first_pts_check = 1;
426
        ts_st->cc = 15;
427
        /* update PCR pid by using the first video stream */
428
        if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
429
            service->pcr_pid == 0x1fff) {
430
            service->pcr_pid = ts_st->pid;
431
            pcr_st = st;
432
        }
433
        if (st->codec->codec_id == CODEC_ID_AAC &&
434
            st->codec->extradata_size > 0) {
435
            ts_st->adts = av_mallocz(sizeof(*ts_st->adts));
436
            if (!ts_st->adts)
437
                return AVERROR(ENOMEM);
438
            if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata,
439
                                         st->codec->extradata_size) < 0)
440
                return -1;
441
        }
442
    }
443

    
444
    /* if no video stream, use the first stream as PCR */
445
    if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
446
        pcr_st = s->streams[0];
447
        ts_st = pcr_st->priv_data;
448
        service->pcr_pid = ts_st->pid;
449
    }
450

    
451
    ts->mux_rate = s->mux_rate ? s->mux_rate : 1;
452

    
453
    if (ts->mux_rate > 1) {
454
        service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
455
            (TS_PACKET_SIZE * 8 * 1000);
456
        ts->sdt_packet_period      = (ts->mux_rate * SDT_RETRANS_TIME) /
457
            (TS_PACKET_SIZE * 8 * 1000);
458
        ts->pat_packet_period      = (ts->mux_rate * PAT_RETRANS_TIME) /
459
            (TS_PACKET_SIZE * 8 * 1000);
460

    
461
        ts->cur_pcr = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
462
    } else {
463
        /* Arbitrary values, PAT/PMT could be written on key frames */
464
        ts->sdt_packet_period = 200;
465
        ts->pat_packet_period = 40;
466
        if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
467
            if (!pcr_st->codec->frame_size) {
468
                av_log(s, AV_LOG_WARNING, "frame size not set\n");
469
                service->pcr_packet_period =
470
                    pcr_st->codec->sample_rate/(10*512);
471
            } else {
472
                service->pcr_packet_period =
473
                    pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
474
            }
475
        } else {
476
            // max delta PCR 0.1s
477
            service->pcr_packet_period =
478
                pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
479
        }
480
    }
481

    
482
    // output a PCR as soon as possible
483
    service->pcr_packet_count = service->pcr_packet_period;
484
    ts->pat_packet_count = ts->pat_packet_period-1;
485
    ts->sdt_packet_count = ts->sdt_packet_period-1;
486

    
487
    av_log(s, AV_LOG_INFO,
488
           "muxrate %d bps, pcr every %d pkts, "
489
           "sdt every %d, pat/pmt every %d pkts\n",
490
           ts->mux_rate, service->pcr_packet_period,
491
           ts->sdt_packet_period, ts->pat_packet_period);
492

    
493

    
494
    put_flush_packet(s->pb);
495

    
496
    return 0;
497

    
498
 fail:
499
    for(i = 0;i < s->nb_streams; i++) {
500
        st = s->streams[i];
501
        av_free(st->priv_data);
502
    }
503
    return -1;
504
}
505

    
506
/* send SDT, PAT and PMT tables regulary */
507
static void retransmit_si_info(AVFormatContext *s)
508
{
509
    MpegTSWrite *ts = s->priv_data;
510
    int i;
511

    
512
    if (++ts->sdt_packet_count == ts->sdt_packet_period) {
513
        ts->sdt_packet_count = 0;
514
        mpegts_write_sdt(s);
515
    }
516
    if (++ts->pat_packet_count == ts->pat_packet_period) {
517
        ts->pat_packet_count = 0;
518
        mpegts_write_pat(s);
519
        for(i = 0; i < ts->nb_services; i++) {
520
            mpegts_write_pmt(s, ts->services[i]);
521
        }
522
    }
523
}
524

    
525
/* Write a single null transport stream packet */
526
static void mpegts_insert_null_packet(AVFormatContext *s)
527
{
528
    MpegTSWrite *ts = s->priv_data;
529
    uint8_t *q;
530
    uint8_t buf[TS_PACKET_SIZE];
531

    
532
    q = buf;
533
    *q++ = 0x47;
534
    *q++ = 0x00 | 0x1f;
535
    *q++ = 0xff;
536
    *q++ = 0x10;
537
    memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
538
    put_buffer(s->pb, buf, TS_PACKET_SIZE);
539
    ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
540
}
541

    
542
/* Write a single transport stream packet with a PCR and no payload */
543
static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
544
{
545
    MpegTSWrite *ts = s->priv_data;
546
    MpegTSWriteStream *ts_st = st->priv_data;
547
    uint8_t *q;
548
    uint64_t pcr = ts->cur_pcr;
549
    uint8_t buf[TS_PACKET_SIZE];
550

    
551
    q = buf;
552
    *q++ = 0x47;
553
    *q++ = ts_st->pid >> 8;
554
    *q++ = ts_st->pid;
555
    *q++ = 0x20 | ts_st->cc;   /* Adaptation only */
556
    /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
557
    *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
558
    *q++ = 0x10;               /* Adaptation flags: PCR present */
559

    
560
    /* PCR coded into 6 bytes */
561
    *q++ = pcr >> 25;
562
    *q++ = pcr >> 17;
563
    *q++ = pcr >> 9;
564
    *q++ = pcr >> 1;
565
    *q++ = (pcr & 1) << 7;
566
    *q++ = 0;
567

    
568
    /* stuffing bytes */
569
    memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
570
    put_buffer(s->pb, buf, TS_PACKET_SIZE);
571
    ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
572
}
573

    
574
static void write_pts(uint8_t *q, int fourbits, int64_t pts)
575
{
576
    int val;
577

    
578
    val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
579
    *q++ = val;
580
    val = (((pts >> 15) & 0x7fff) << 1) | 1;
581
    *q++ = val >> 8;
582
    *q++ = val;
583
    val = (((pts) & 0x7fff) << 1) | 1;
584
    *q++ = val >> 8;
585
    *q++ = val;
586
}
587

    
588
/* Add a pes header to the front of payload, and segment into an integer number of
589
 * ts packets. The final ts packet is padded using an over-sized adaptation header
590
 * to exactly fill the last ts packet.
591
 * NOTE: 'payload' contains a complete PES payload.
592
 */
593
static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
594
                             const uint8_t *payload, int payload_size,
595
                             int64_t pts, int64_t dts)
596
{
597
    MpegTSWriteStream *ts_st = st->priv_data;
598
    MpegTSWrite *ts = s->priv_data;
599
    uint8_t buf[TS_PACKET_SIZE];
600
    uint8_t *q;
601
    int val, is_start, len, header_len, write_pcr, private_code, flags;
602
    int afc_len, stuffing_len;
603
    int64_t pcr = -1; /* avoid warning */
604
    int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
605

    
606
    is_start = 1;
607
    while (payload_size > 0) {
608
        retransmit_si_info(s);
609

    
610
        write_pcr = 0;
611
        if (ts_st->pid == ts_st->service->pcr_pid) {
612
            if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
613
                ts_st->service->pcr_packet_count++;
614
            if (ts_st->service->pcr_packet_count >=
615
                ts_st->service->pcr_packet_period) {
616
                ts_st->service->pcr_packet_count = 0;
617
                write_pcr = 1;
618
            }
619
        }
620

    
621
        if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
622
            (dts - (int64_t)ts->cur_pcr) > delay) {
623
            /* pcr insert gets priority over null packet insert */
624
            if (write_pcr)
625
                mpegts_insert_pcr_only(s, st);
626
            else
627
                mpegts_insert_null_packet(s);
628
            continue; /* recalculate write_pcr and possibly retransmit si_info */
629
        }
630

    
631
        /* prepare packet header */
632
        q = buf;
633
        *q++ = 0x47;
634
        val = (ts_st->pid >> 8);
635
        if (is_start)
636
            val |= 0x40;
637
        *q++ = val;
638
        *q++ = ts_st->pid;
639
        ts_st->cc = (ts_st->cc + 1) & 0xf;
640
        *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
641
        if (write_pcr) {
642
            // add 11, pcr references the last byte of program clock reference base
643
            if (ts->mux_rate > 1)
644
                pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate;
645
            else
646
                pcr = dts - delay;
647
            if (dts != AV_NOPTS_VALUE && dts < pcr)
648
                av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
649
            *q++ = 7; /* AFC length */
650
            *q++ = 0x10; /* flags: PCR present */
651
            *q++ = pcr >> 25;
652
            *q++ = pcr >> 17;
653
            *q++ = pcr >> 9;
654
            *q++ = pcr >> 1;
655
            *q++ = (pcr & 1) << 7;
656
            *q++ = 0;
657
        }
658
        if (is_start) {
659
            int pes_extension = 0;
660
            /* write PES header */
661
            *q++ = 0x00;
662
            *q++ = 0x00;
663
            *q++ = 0x01;
664
            private_code = 0;
665
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
666
                if (st->codec->codec_id == CODEC_ID_DIRAC) {
667
                    *q++ = 0xfd;
668
                } else
669
                    *q++ = 0xe0;
670
            } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
671
                       (st->codec->codec_id == CODEC_ID_MP2 ||
672
                        st->codec->codec_id == CODEC_ID_MP3)) {
673
                *q++ = 0xc0;
674
            } else {
675
                *q++ = 0xbd;
676
                if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
677
                    private_code = 0x20;
678
                }
679
            }
680
            header_len = 0;
681
            flags = 0;
682
            if (pts != AV_NOPTS_VALUE) {
683
                header_len += 5;
684
                flags |= 0x80;
685
            }
686
            if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
687
                header_len += 5;
688
                flags |= 0x40;
689
            }
690
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
691
                st->codec->codec_id == CODEC_ID_DIRAC) {
692
                /* set PES_extension_flag */
693
                pes_extension = 1;
694
                flags |= 0x01;
695

    
696
                /*
697
                * One byte for PES2 extension flag +
698
                * one byte for extension length +
699
                * one byte for extension id
700
                */
701
                header_len += 3;
702
            }
703
            len = payload_size + header_len + 3;
704
            if (private_code != 0)
705
                len++;
706
            if (len > 0xffff)
707
                len = 0;
708
            *q++ = len >> 8;
709
            *q++ = len;
710
            val = 0x80;
711
            /* data alignment indicator is required for subtitle data */
712
            if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
713
                val |= 0x04;
714
            *q++ = val;
715
            *q++ = flags;
716
            *q++ = header_len;
717
            if (pts != AV_NOPTS_VALUE) {
718
                write_pts(q, flags >> 6, pts);
719
                q += 5;
720
            }
721
            if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
722
                write_pts(q, 1, dts);
723
                q += 5;
724
            }
725
            if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
726
                flags = 0x01;  /* set PES_extension_flag_2 */
727
                *q++ = flags;
728
                *q++ = 0x80 | 0x01;  /* marker bit + extension length */
729
                /*
730
                * Set the stream id extension flag bit to 0 and
731
                * write the extended stream id
732
                */
733
                *q++ = 0x00 | 0x60;
734
            }
735
            if (private_code != 0)
736
                *q++ = private_code;
737
            is_start = 0;
738
        }
739
        /* header size */
740
        header_len = q - buf;
741
        /* data len */
742
        len = TS_PACKET_SIZE - header_len;
743
        if (len > payload_size)
744
            len = payload_size;
745
        stuffing_len = TS_PACKET_SIZE - header_len - len;
746
        if (stuffing_len > 0) {
747
            /* add stuffing with AFC */
748
            if (buf[3] & 0x20) {
749
                /* stuffing already present: increase its size */
750
                afc_len = buf[4] + 1;
751
                memmove(buf + 4 + afc_len + stuffing_len,
752
                        buf + 4 + afc_len,
753
                        header_len - (4 + afc_len));
754
                buf[4] += stuffing_len;
755
                memset(buf + 4 + afc_len, 0xff, stuffing_len);
756
            } else {
757
                /* add stuffing */
758
                memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
759
                buf[3] |= 0x20;
760
                buf[4] = stuffing_len - 1;
761
                if (stuffing_len >= 2) {
762
                    buf[5] = 0x00;
763
                    memset(buf + 6, 0xff, stuffing_len - 2);
764
                }
765
            }
766
        }
767
        memcpy(buf + TS_PACKET_SIZE - len, payload, len);
768
        payload += len;
769
        payload_size -= len;
770
        put_buffer(s->pb, buf, TS_PACKET_SIZE);
771
        ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
772
    }
773
    put_flush_packet(s->pb);
774
}
775

    
776
static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
777
{
778
    AVStream *st = s->streams[pkt->stream_index];
779
    int size = pkt->size;
780
    uint8_t *buf= pkt->data;
781
    uint8_t *data= NULL;
782
    MpegTSWriteStream *ts_st = st->priv_data;
783
    const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
784
    int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
785

    
786
    if (pkt->pts != AV_NOPTS_VALUE)
787
        pts = pkt->pts + delay;
788
    if (pkt->dts != AV_NOPTS_VALUE)
789
        dts = pkt->dts + delay;
790

    
791
    if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
792
        av_log(s, AV_LOG_ERROR, "first pts value must set\n");
793
        return -1;
794
    }
795
    ts_st->first_pts_check = 0;
796

    
797
    if (st->codec->codec_id == CODEC_ID_H264) {
798
        const uint8_t *p = buf, *buf_end = p+size;
799
        uint32_t state = -1;
800

    
801
        if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
802
            av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, "
803
                   "no startcode found, use -vbsf h264_mp4toannexb\n");
804
            return -1;
805
        }
806

    
807
        do {
808
            p = ff_find_start_code(p, buf_end, &state);
809
            //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);
810
        } while (p < buf_end && (state & 0x1f) != 9 &&
811
                 (state & 0x1f) != 5 && (state & 0x1f) != 1);
812

    
813
        if ((state & 0x1f) != 9) { // AUD NAL
814
            data = av_malloc(pkt->size+6);
815
            if (!data)
816
                return -1;
817
            memcpy(data+6, pkt->data, pkt->size);
818
            AV_WB32(data, 0x00000001);
819
            data[4] = 0x09;
820
            data[5] = 0xe0; // any slice type
821
            buf  = data;
822
            size = pkt->size+6;
823
        }
824
    } else if (st->codec->codec_id == CODEC_ID_AAC) {
825
        if (pkt->size < 2)
826
            return -1;
827
        if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
828
            ADTSContext *adts = ts_st->adts;
829
            int new_size;
830
            if (!adts) {
831
                av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "
832
                       "and extradata missing\n");
833
                return -1;
834
            }
835
            new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;
836
            if ((unsigned)new_size >= INT_MAX)
837
                return -1;
838
            data = av_malloc(new_size);
839
            if (!data)
840
                return AVERROR(ENOMEM);
841
            ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size);
842
            if (adts->pce_size) {
843
                memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);
844
                adts->pce_size = 0;
845
            }
846
            memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);
847
            buf = data;
848
            size = new_size;
849
        }
850
    }
851

    
852
    if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
853
        // for video and subtitle, write a single pes packet
854
        mpegts_write_pes(s, st, buf, size, pts, dts);
855
        av_free(data);
856
        return 0;
857
    }
858

    
859
    if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {
860
        mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
861
                         ts_st->payload_pts, ts_st->payload_dts);
862
        ts_st->payload_index = 0;
863
    }
864

    
865
    if (!ts_st->payload_index) {
866
        ts_st->payload_pts = pts;
867
        ts_st->payload_dts = dts;
868
    }
869

    
870
    memcpy(ts_st->payload + ts_st->payload_index, buf, size);
871
    ts_st->payload_index += size;
872

    
873
    av_free(data);
874

    
875
    return 0;
876
}
877

    
878
static int mpegts_write_end(AVFormatContext *s)
879
{
880
    MpegTSWrite *ts = s->priv_data;
881
    MpegTSWriteStream *ts_st;
882
    MpegTSService *service;
883
    AVStream *st;
884
    int i;
885

    
886
    /* flush current packets */
887
    for(i = 0; i < s->nb_streams; i++) {
888
        st = s->streams[i];
889
        ts_st = st->priv_data;
890
        if (ts_st->payload_index > 0) {
891
            mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
892
                             ts_st->payload_pts, ts_st->payload_dts);
893
        }
894
        av_freep(&ts_st->adts);
895
    }
896
    put_flush_packet(s->pb);
897

    
898
    for(i = 0; i < ts->nb_services; i++) {
899
        service = ts->services[i];
900
        av_freep(&service->provider_name);
901
        av_freep(&service->name);
902
        av_free(service);
903
    }
904
    av_free(ts->services);
905

    
906
    return 0;
907
}
908

    
909
AVOutputFormat mpegts_muxer = {
910
    "mpegts",
911
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
912
    "video/x-mpegts",
913
    "ts,m2t",
914
    sizeof(MpegTSWrite),
915
    CODEC_ID_MP2,
916
    CODEC_ID_MPEG2VIDEO,
917
    mpegts_write_header,
918
    mpegts_write_packet,
919
    mpegts_write_end,
920
};