Statistics
| Branch: | Revision:

ffmpeg / libavformat / mpegtsenc.c @ a735bbbb

History | View | Annotate | Download (31.2 KB)

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
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * 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 "libavutil/opt.h"
25
#include "libavcodec/mpegvideo.h"
26
#include "avformat.h"
27
#include "internal.h"
28
#include "mpegts.h"
29
#include "adts.h"
30

    
31
#define PCR_TIME_BASE 27000000
32

    
33
/* write DVB SI sections */
34

    
35
/*********************************************/
36
/* mpegts section writer */
37

    
38
typedef struct MpegTSSection {
39
    int pid;
40
    int cc;
41
    void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
42
    void *opaque;
43
} MpegTSSection;
44

    
45
typedef struct MpegTSService {
46
    MpegTSSection pmt; /* MPEG2 pmt table context */
47
    int sid;           /* service ID */
48
    char *name;
49
    char *provider_name;
50
    int pcr_pid;
51
    int pcr_packet_count;
52
    int pcr_packet_period;
53
} MpegTSService;
54

    
55
typedef struct MpegTSWrite {
56
    MpegTSSection pat; /* MPEG2 pat table */
57
    MpegTSSection sdt; /* MPEG2 sdt table context */
58
    MpegTSService **services;
59
    int sdt_packet_count;
60
    int sdt_packet_period;
61
    int pat_packet_count;
62
    int pat_packet_period;
63
    int nb_services;
64
    int onid;
65
    int tsid;
66
    int64_t first_pcr;
67
    int mux_rate; ///< set to 1 when VBR
68

    
69
    int transport_stream_id;
70
    int original_network_id;
71
    int service_id;
72

    
73
    int pmt_start_pid;
74
    int start_pid;
75
} MpegTSWrite;
76

    
77
static const AVOption options[] = {
78
    { "mpegts_transport_stream_id", "Set transport_stream_id field.",
79
      offsetof(MpegTSWrite, transport_stream_id), FF_OPT_TYPE_INT, 0x0001, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
80
    { "mpegts_original_network_id", "Set original_network_id field.",
81
      offsetof(MpegTSWrite, original_network_id), FF_OPT_TYPE_INT, 0x0001, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
82
    { "mpegts_service_id", "Set service_id field.",
83
      offsetof(MpegTSWrite, service_id), FF_OPT_TYPE_INT, 0x0001, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
84
    { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
85
      offsetof(MpegTSWrite, pmt_start_pid), FF_OPT_TYPE_INT, 0x1000, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
86
    { "mpegts_start_pid", "Set the first pid.",
87
      offsetof(MpegTSWrite, start_pid), FF_OPT_TYPE_INT, 0x0100, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
88
    { NULL },
89
};
90

    
91
static const AVClass mpegts_muxer_class = {
92
    "MPEGTS muxer",
93
    av_default_item_name,
94
    options,
95
    LIBAVUTIL_VERSION_INT,
96
};
97

    
98
/* NOTE: 4 bytes must be left at the end for the crc32 */
99
static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
100
{
101
    unsigned int crc;
102
    unsigned char packet[TS_PACKET_SIZE];
103
    const unsigned char *buf_ptr;
104
    unsigned char *q;
105
    int first, b, len1, left;
106

    
107
    crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
108
    buf[len - 4] = (crc >> 24) & 0xff;
109
    buf[len - 3] = (crc >> 16) & 0xff;
110
    buf[len - 2] = (crc >> 8) & 0xff;
111
    buf[len - 1] = (crc) & 0xff;
112

    
113
    /* send each packet */
114
    buf_ptr = buf;
115
    while (len > 0) {
116
        first = (buf == buf_ptr);
117
        q = packet;
118
        *q++ = 0x47;
119
        b = (s->pid >> 8);
120
        if (first)
121
            b |= 0x40;
122
        *q++ = b;
123
        *q++ = s->pid;
124
        s->cc = (s->cc + 1) & 0xf;
125
        *q++ = 0x10 | s->cc;
126
        if (first)
127
            *q++ = 0; /* 0 offset */
128
        len1 = TS_PACKET_SIZE - (q - packet);
129
        if (len1 > len)
130
            len1 = len;
131
        memcpy(q, buf_ptr, len1);
132
        q += len1;
133
        /* add known padding data */
134
        left = TS_PACKET_SIZE - (q - packet);
135
        if (left > 0)
136
            memset(q, 0xff, left);
137

    
138
        s->write_packet(s, packet);
139

    
140
        buf_ptr += len1;
141
        len -= len1;
142
    }
143
}
144

    
145
static inline void put16(uint8_t **q_ptr, int val)
146
{
147
    uint8_t *q;
148
    q = *q_ptr;
149
    *q++ = val >> 8;
150
    *q++ = val;
151
    *q_ptr = q;
152
}
153

    
154
static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
155
                          int version, int sec_num, int last_sec_num,
156
                          uint8_t *buf, int len)
157
{
158
    uint8_t section[1024], *q;
159
    unsigned int tot_len;
160
    /* reserved_future_use field must be set to 1 for SDT */
161
    unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
162

    
163
    tot_len = 3 + 5 + len + 4;
164
    /* check if not too big */
165
    if (tot_len > 1024)
166
        return -1;
167

    
168
    q = section;
169
    *q++ = tid;
170
    put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
171
    put16(&q, id);
172
    *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
173
    *q++ = sec_num;
174
    *q++ = last_sec_num;
175
    memcpy(q, buf, len);
176

    
177
    mpegts_write_section(s, section, tot_len);
178
    return 0;
179
}
180

    
181
/*********************************************/
182
/* mpegts writer */
183

    
184
#define DEFAULT_PROVIDER_NAME   "FFmpeg"
185
#define DEFAULT_SERVICE_NAME    "Service01"
186

    
187
/* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
188
#define DEFAULT_PES_HEADER_FREQ 16
189
#define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
190

    
191
/* we retransmit the SI info at this rate */
192
#define SDT_RETRANS_TIME 500
193
#define PAT_RETRANS_TIME 100
194
#define PCR_RETRANS_TIME 20
195

    
196
typedef struct MpegTSWriteStream {
197
    struct MpegTSService *service;
198
    int pid; /* stream associated pid */
199
    int cc;
200
    int payload_index;
201
    int first_pts_check; ///< first pts check needed
202
    int64_t payload_pts;
203
    int64_t payload_dts;
204
    uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
205
    ADTSContext *adts;
206
} MpegTSWriteStream;
207

    
208
static void mpegts_write_pat(AVFormatContext *s)
209
{
210
    MpegTSWrite *ts = s->priv_data;
211
    MpegTSService *service;
212
    uint8_t data[1012], *q;
213
    int i;
214

    
215
    q = data;
216
    for(i = 0; i < ts->nb_services; i++) {
217
        service = ts->services[i];
218
        put16(&q, service->sid);
219
        put16(&q, 0xe000 | service->pmt.pid);
220
    }
221
    mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
222
                          data, q - data);
223
}
224

    
225
static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
226
{
227
    //    MpegTSWrite *ts = s->priv_data;
228
    uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
229
    int val, stream_type, i;
230

    
231
    q = data;
232
    put16(&q, 0xe000 | service->pcr_pid);
233

    
234
    program_info_length_ptr = q;
235
    q += 2; /* patched after */
236

    
237
    /* put program info here */
238

    
239
    val = 0xf000 | (q - program_info_length_ptr - 2);
240
    program_info_length_ptr[0] = val >> 8;
241
    program_info_length_ptr[1] = val;
242

    
243
    for(i = 0; i < s->nb_streams; i++) {
244
        AVStream *st = s->streams[i];
245
        MpegTSWriteStream *ts_st = st->priv_data;
246
        AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0);
247
        switch(st->codec->codec_id) {
248
        case CODEC_ID_MPEG1VIDEO:
249
        case CODEC_ID_MPEG2VIDEO:
250
            stream_type = STREAM_TYPE_VIDEO_MPEG2;
251
            break;
252
        case CODEC_ID_MPEG4:
253
            stream_type = STREAM_TYPE_VIDEO_MPEG4;
254
            break;
255
        case CODEC_ID_H264:
256
            stream_type = STREAM_TYPE_VIDEO_H264;
257
            break;
258
        case CODEC_ID_DIRAC:
259
            stream_type = STREAM_TYPE_VIDEO_DIRAC;
260
            break;
261
        case CODEC_ID_MP2:
262
        case CODEC_ID_MP3:
263
            stream_type = STREAM_TYPE_AUDIO_MPEG1;
264
            break;
265
        case CODEC_ID_AAC:
266
            stream_type = STREAM_TYPE_AUDIO_AAC;
267
            break;
268
        case CODEC_ID_AAC_LATM:
269
            stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
270
            break;
271
        case CODEC_ID_AC3:
272
            stream_type = STREAM_TYPE_AUDIO_AC3;
273
            break;
274
        default:
275
            stream_type = STREAM_TYPE_PRIVATE_DATA;
276
            break;
277
        }
278
        *q++ = stream_type;
279
        put16(&q, 0xe000 | ts_st->pid);
280
        desc_length_ptr = q;
281
        q += 2; /* patched after */
282

    
283
        /* write optional descriptors here */
284
        switch(st->codec->codec_type) {
285
        case AVMEDIA_TYPE_AUDIO:
286
            if (lang && strlen(lang->value) == 3) {
287
                *q++ = 0x0a; /* ISO 639 language descriptor */
288
                *q++ = 4;
289
                *q++ = lang->value[0];
290
                *q++ = lang->value[1];
291
                *q++ = lang->value[2];
292
                *q++ = 0; /* undefined type */
293
            }
294
            break;
295
        case AVMEDIA_TYPE_SUBTITLE:
296
            {
297
                const char *language;
298
                language = lang && strlen(lang->value)==3 ? lang->value : "eng";
299
                *q++ = 0x59;
300
                *q++ = 8;
301
                *q++ = language[0];
302
                *q++ = language[1];
303
                *q++ = language[2];
304
                *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
305
                if(st->codec->extradata_size == 4) {
306
                    memcpy(q, st->codec->extradata, 4);
307
                    q += 4;
308
                } else {
309
                    put16(&q, 1); /* page id */
310
                    put16(&q, 1); /* ancillary page id */
311
                }
312
            }
313
            break;
314
        case AVMEDIA_TYPE_VIDEO:
315
            if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
316
                *q++ = 0x05; /*MPEG-2 registration descriptor*/
317
                *q++ = 4;
318
                *q++ = 'd';
319
                *q++ = 'r';
320
                *q++ = 'a';
321
                *q++ = 'c';
322
            }
323
            break;
324
        }
325

    
326
        val = 0xf000 | (q - desc_length_ptr - 2);
327
        desc_length_ptr[0] = val >> 8;
328
        desc_length_ptr[1] = val;
329
    }
330
    mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
331
                          data, q - data);
332
}
333

    
334
/* NOTE: str == NULL is accepted for an empty string */
335
static void putstr8(uint8_t **q_ptr, const char *str)
336
{
337
    uint8_t *q;
338
    int len;
339

    
340
    q = *q_ptr;
341
    if (!str)
342
        len = 0;
343
    else
344
        len = strlen(str);
345
    *q++ = len;
346
    memcpy(q, str, len);
347
    q += len;
348
    *q_ptr = q;
349
}
350

    
351
static void mpegts_write_sdt(AVFormatContext *s)
352
{
353
    MpegTSWrite *ts = s->priv_data;
354
    MpegTSService *service;
355
    uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
356
    int i, running_status, free_ca_mode, val;
357

    
358
    q = data;
359
    put16(&q, ts->onid);
360
    *q++ = 0xff;
361
    for(i = 0; i < ts->nb_services; i++) {
362
        service = ts->services[i];
363
        put16(&q, service->sid);
364
        *q++ = 0xfc | 0x00; /* currently no EIT info */
365
        desc_list_len_ptr = q;
366
        q += 2;
367
        running_status = 4; /* running */
368
        free_ca_mode = 0;
369

    
370
        /* write only one descriptor for the service name and provider */
371
        *q++ = 0x48;
372
        desc_len_ptr = q;
373
        q++;
374
        *q++ = 0x01; /* digital television service */
375
        putstr8(&q, service->provider_name);
376
        putstr8(&q, service->name);
377
        desc_len_ptr[0] = q - desc_len_ptr - 1;
378

    
379
        /* fill descriptor length */
380
        val = (running_status << 13) | (free_ca_mode << 12) |
381
            (q - desc_list_len_ptr - 2);
382
        desc_list_len_ptr[0] = val >> 8;
383
        desc_list_len_ptr[1] = val;
384
    }
385
    mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
386
                          data, q - data);
387
}
388

    
389
static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
390
                                         int sid,
391
                                         const char *provider_name,
392
                                         const char *name)
393
{
394
    MpegTSService *service;
395

    
396
    service = av_mallocz(sizeof(MpegTSService));
397
    if (!service)
398
        return NULL;
399
    service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
400
    service->sid = sid;
401
    service->provider_name = av_strdup(provider_name);
402
    service->name = av_strdup(name);
403
    service->pcr_pid = 0x1fff;
404
    dynarray_add(&ts->services, &ts->nb_services, service);
405
    return service;
406
}
407

    
408
static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
409
{
410
    AVFormatContext *ctx = s->opaque;
411
    put_buffer(ctx->pb, packet, TS_PACKET_SIZE);
412
}
413

    
414
static int mpegts_write_header(AVFormatContext *s)
415
{
416
    MpegTSWrite *ts = s->priv_data;
417
    MpegTSWriteStream *ts_st;
418
    MpegTSService *service;
419
    AVStream *st, *pcr_st = NULL;
420
    AVMetadataTag *title, *provider;
421
    int i, j;
422
    const char *service_name;
423
    const char *provider_name;
424
    int *pids;
425

    
426
    ts->tsid = ts->transport_stream_id;
427
    ts->onid = ts->original_network_id;
428
    /* allocate a single DVB service */
429
    title = av_metadata_get(s->metadata, "service_name", NULL, 0);
430
    if (!title)
431
        title = av_metadata_get(s->metadata, "title", NULL, 0);
432
    service_name = title ? title->value : DEFAULT_SERVICE_NAME;
433
    provider = av_metadata_get(s->metadata, "service_provider", NULL, 0);
434
    provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
435
    service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
436
    service->pmt.write_packet = section_write_packet;
437
    service->pmt.opaque = s;
438
    service->pmt.cc = 15;
439

    
440
    ts->pat.pid = PAT_PID;
441
    ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
442
    ts->pat.write_packet = section_write_packet;
443
    ts->pat.opaque = s;
444

    
445
    ts->sdt.pid = SDT_PID;
446
    ts->sdt.cc = 15;
447
    ts->sdt.write_packet = section_write_packet;
448
    ts->sdt.opaque = s;
449

    
450
    pids = av_malloc(s->nb_streams * sizeof(*pids));
451
    if (!pids)
452
        return AVERROR(ENOMEM);
453

    
454
    /* assign pids to each stream */
455
    for(i = 0;i < s->nb_streams; i++) {
456
        st = s->streams[i];
457
        ts_st = av_mallocz(sizeof(MpegTSWriteStream));
458
        if (!ts_st)
459
            goto fail;
460
        st->priv_data = ts_st;
461
        ts_st->service = service;
462
        /* MPEG pid values < 16 are reserved. Applications which set st->id in
463
         * this range are assigned a calculated pid. */
464
        if (st->id < 16) {
465
            ts_st->pid = ts->start_pid + i;
466
        } else if (st->id < 0x1FFF) {
467
            ts_st->pid = st->id;
468
        } else {
469
            av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
470
            goto fail;
471
        }
472
        if (ts_st->pid == service->pmt.pid) {
473
            av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
474
            goto fail;
475
        }
476
        for (j = 0; j < i; j++)
477
            if (pids[j] == ts_st->pid) {
478
                av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
479
                goto fail;
480
            }
481
        pids[i] = ts_st->pid;
482
        ts_st->payload_pts = AV_NOPTS_VALUE;
483
        ts_st->payload_dts = AV_NOPTS_VALUE;
484
        ts_st->first_pts_check = 1;
485
        ts_st->cc = 15;
486
        /* update PCR pid by using the first video stream */
487
        if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
488
            service->pcr_pid == 0x1fff) {
489
            service->pcr_pid = ts_st->pid;
490
            pcr_st = st;
491
        }
492
        if (st->codec->codec_id == CODEC_ID_AAC &&
493
            st->codec->extradata_size > 0) {
494
            ts_st->adts = av_mallocz(sizeof(*ts_st->adts));
495
            if (!ts_st->adts)
496
                return AVERROR(ENOMEM);
497
            if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata,
498
                                         st->codec->extradata_size) < 0)
499
                return -1;
500
        }
501
    }
502

    
503
    av_free(pids);
504

    
505
    /* if no video stream, use the first stream as PCR */
506
    if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
507
        pcr_st = s->streams[0];
508
        ts_st = pcr_st->priv_data;
509
        service->pcr_pid = ts_st->pid;
510
    }
511

    
512
    ts->mux_rate = s->mux_rate ? s->mux_rate : 1;
513

    
514
    if (ts->mux_rate > 1) {
515
        service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
516
            (TS_PACKET_SIZE * 8 * 1000);
517
        ts->sdt_packet_period      = (ts->mux_rate * SDT_RETRANS_TIME) /
518
            (TS_PACKET_SIZE * 8 * 1000);
519
        ts->pat_packet_period      = (ts->mux_rate * PAT_RETRANS_TIME) /
520
            (TS_PACKET_SIZE * 8 * 1000);
521

    
522
        ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
523
    } else {
524
        /* Arbitrary values, PAT/PMT could be written on key frames */
525
        ts->sdt_packet_period = 200;
526
        ts->pat_packet_period = 40;
527
        if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
528
            if (!pcr_st->codec->frame_size) {
529
                av_log(s, AV_LOG_WARNING, "frame size not set\n");
530
                service->pcr_packet_period =
531
                    pcr_st->codec->sample_rate/(10*512);
532
            } else {
533
                service->pcr_packet_period =
534
                    pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
535
            }
536
        } else {
537
            // max delta PCR 0.1s
538
            service->pcr_packet_period =
539
                pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
540
        }
541
    }
542

    
543
    // output a PCR as soon as possible
544
    service->pcr_packet_count = service->pcr_packet_period;
545
    ts->pat_packet_count = ts->pat_packet_period-1;
546
    ts->sdt_packet_count = ts->sdt_packet_period-1;
547

    
548
    if (ts->mux_rate == 1)
549
        av_log(s, AV_LOG_INFO, "muxrate VBR, ");
550
    else
551
        av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);
552
    av_log(s, AV_LOG_INFO, "pcr every %d pkts, "
553
           "sdt every %d, pat/pmt every %d pkts\n",
554
           service->pcr_packet_period,
555
           ts->sdt_packet_period, ts->pat_packet_period);
556

    
557
    put_flush_packet(s->pb);
558

    
559
    return 0;
560

    
561
 fail:
562
    av_free(pids);
563
    for(i = 0;i < s->nb_streams; i++) {
564
        st = s->streams[i];
565
        av_free(st->priv_data);
566
    }
567
    return -1;
568
}
569

    
570
/* send SDT, PAT and PMT tables regulary */
571
static void retransmit_si_info(AVFormatContext *s)
572
{
573
    MpegTSWrite *ts = s->priv_data;
574
    int i;
575

    
576
    if (++ts->sdt_packet_count == ts->sdt_packet_period) {
577
        ts->sdt_packet_count = 0;
578
        mpegts_write_sdt(s);
579
    }
580
    if (++ts->pat_packet_count == ts->pat_packet_period) {
581
        ts->pat_packet_count = 0;
582
        mpegts_write_pat(s);
583
        for(i = 0; i < ts->nb_services; i++) {
584
            mpegts_write_pmt(s, ts->services[i]);
585
        }
586
    }
587
}
588

    
589
static int64_t get_pcr(const MpegTSWrite *ts, ByteIOContext *pb)
590
{
591
    return av_rescale(url_ftell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
592
           ts->first_pcr;
593
}
594

    
595
static uint8_t* write_pcr_bits(uint8_t *buf, int64_t pcr)
596
{
597
    int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
598

    
599
    *buf++ = pcr_high >> 25;
600
    *buf++ = pcr_high >> 17;
601
    *buf++ = pcr_high >> 9;
602
    *buf++ = pcr_high >> 1;
603
    *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
604
    *buf++ = pcr_low;
605

    
606
    return buf;
607
}
608

    
609
/* Write a single null transport stream packet */
610
static void mpegts_insert_null_packet(AVFormatContext *s)
611
{
612
    uint8_t *q;
613
    uint8_t buf[TS_PACKET_SIZE];
614

    
615
    q = buf;
616
    *q++ = 0x47;
617
    *q++ = 0x00 | 0x1f;
618
    *q++ = 0xff;
619
    *q++ = 0x10;
620
    memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
621
    put_buffer(s->pb, buf, TS_PACKET_SIZE);
622
}
623

    
624
/* Write a single transport stream packet with a PCR and no payload */
625
static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
626
{
627
    MpegTSWrite *ts = s->priv_data;
628
    MpegTSWriteStream *ts_st = st->priv_data;
629
    uint8_t *q;
630
    uint8_t buf[TS_PACKET_SIZE];
631

    
632
    q = buf;
633
    *q++ = 0x47;
634
    *q++ = ts_st->pid >> 8;
635
    *q++ = ts_st->pid;
636
    *q++ = 0x20 | ts_st->cc;   /* Adaptation only */
637
    /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
638
    *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
639
    *q++ = 0x10;               /* Adaptation flags: PCR present */
640

    
641
    /* PCR coded into 6 bytes */
642
    q = write_pcr_bits(q, get_pcr(ts, s->pb));
643

    
644
    /* stuffing bytes */
645
    memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
646
    put_buffer(s->pb, buf, TS_PACKET_SIZE);
647
}
648

    
649
static void write_pts(uint8_t *q, int fourbits, int64_t pts)
650
{
651
    int val;
652

    
653
    val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
654
    *q++ = val;
655
    val = (((pts >> 15) & 0x7fff) << 1) | 1;
656
    *q++ = val >> 8;
657
    *q++ = val;
658
    val = (((pts) & 0x7fff) << 1) | 1;
659
    *q++ = val >> 8;
660
    *q++ = val;
661
}
662

    
663
/* Add a pes header to the front of payload, and segment into an integer number of
664
 * ts packets. The final ts packet is padded using an over-sized adaptation header
665
 * to exactly fill the last ts packet.
666
 * NOTE: 'payload' contains a complete PES payload.
667
 */
668
static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
669
                             const uint8_t *payload, int payload_size,
670
                             int64_t pts, int64_t dts)
671
{
672
    MpegTSWriteStream *ts_st = st->priv_data;
673
    MpegTSWrite *ts = s->priv_data;
674
    uint8_t buf[TS_PACKET_SIZE];
675
    uint8_t *q;
676
    int val, is_start, len, header_len, write_pcr, private_code, flags;
677
    int afc_len, stuffing_len;
678
    int64_t pcr = -1; /* avoid warning */
679
    int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
680

    
681
    is_start = 1;
682
    while (payload_size > 0) {
683
        retransmit_si_info(s);
684

    
685
        write_pcr = 0;
686
        if (ts_st->pid == ts_st->service->pcr_pid) {
687
            if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
688
                ts_st->service->pcr_packet_count++;
689
            if (ts_st->service->pcr_packet_count >=
690
                ts_st->service->pcr_packet_period) {
691
                ts_st->service->pcr_packet_count = 0;
692
                write_pcr = 1;
693
            }
694
        }
695

    
696
        if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
697
            (dts - get_pcr(ts, s->pb)/300) > delay) {
698
            /* pcr insert gets priority over null packet insert */
699
            if (write_pcr)
700
                mpegts_insert_pcr_only(s, st);
701
            else
702
                mpegts_insert_null_packet(s);
703
            continue; /* recalculate write_pcr and possibly retransmit si_info */
704
        }
705

    
706
        /* prepare packet header */
707
        q = buf;
708
        *q++ = 0x47;
709
        val = (ts_st->pid >> 8);
710
        if (is_start)
711
            val |= 0x40;
712
        *q++ = val;
713
        *q++ = ts_st->pid;
714
        ts_st->cc = (ts_st->cc + 1) & 0xf;
715
        *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
716
        if (write_pcr) {
717
            // add 11, pcr references the last byte of program clock reference base
718
            if (ts->mux_rate > 1)
719
                pcr = get_pcr(ts, s->pb);
720
            else
721
                pcr = (dts - delay)*300;
722
            if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
723
                av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
724
            *q++ = 7; /* AFC length */
725
            *q++ = 0x10; /* flags: PCR present */
726
            q = write_pcr_bits(q, pcr);
727
        }
728
        if (is_start) {
729
            int pes_extension = 0;
730
            /* write PES header */
731
            *q++ = 0x00;
732
            *q++ = 0x00;
733
            *q++ = 0x01;
734
            private_code = 0;
735
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
736
                if (st->codec->codec_id == CODEC_ID_DIRAC) {
737
                    *q++ = 0xfd;
738
                } else
739
                    *q++ = 0xe0;
740
            } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
741
                       (st->codec->codec_id == CODEC_ID_MP2 ||
742
                        st->codec->codec_id == CODEC_ID_MP3)) {
743
                *q++ = 0xc0;
744
            } else {
745
                *q++ = 0xbd;
746
                if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
747
                    private_code = 0x20;
748
                }
749
            }
750
            header_len = 0;
751
            flags = 0;
752
            if (pts != AV_NOPTS_VALUE) {
753
                header_len += 5;
754
                flags |= 0x80;
755
            }
756
            if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
757
                header_len += 5;
758
                flags |= 0x40;
759
            }
760
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
761
                st->codec->codec_id == CODEC_ID_DIRAC) {
762
                /* set PES_extension_flag */
763
                pes_extension = 1;
764
                flags |= 0x01;
765

    
766
                /*
767
                * One byte for PES2 extension flag +
768
                * one byte for extension length +
769
                * one byte for extension id
770
                */
771
                header_len += 3;
772
            }
773
            len = payload_size + header_len + 3;
774
            if (private_code != 0)
775
                len++;
776
            if (len > 0xffff)
777
                len = 0;
778
            *q++ = len >> 8;
779
            *q++ = len;
780
            val = 0x80;
781
            /* data alignment indicator is required for subtitle data */
782
            if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
783
                val |= 0x04;
784
            *q++ = val;
785
            *q++ = flags;
786
            *q++ = header_len;
787
            if (pts != AV_NOPTS_VALUE) {
788
                write_pts(q, flags >> 6, pts);
789
                q += 5;
790
            }
791
            if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
792
                write_pts(q, 1, dts);
793
                q += 5;
794
            }
795
            if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
796
                flags = 0x01;  /* set PES_extension_flag_2 */
797
                *q++ = flags;
798
                *q++ = 0x80 | 0x01;  /* marker bit + extension length */
799
                /*
800
                * Set the stream id extension flag bit to 0 and
801
                * write the extended stream id
802
                */
803
                *q++ = 0x00 | 0x60;
804
            }
805
            if (private_code != 0)
806
                *q++ = private_code;
807
            is_start = 0;
808
        }
809
        /* header size */
810
        header_len = q - buf;
811
        /* data len */
812
        len = TS_PACKET_SIZE - header_len;
813
        if (len > payload_size)
814
            len = payload_size;
815
        stuffing_len = TS_PACKET_SIZE - header_len - len;
816
        if (stuffing_len > 0) {
817
            /* add stuffing with AFC */
818
            if (buf[3] & 0x20) {
819
                /* stuffing already present: increase its size */
820
                afc_len = buf[4] + 1;
821
                memmove(buf + 4 + afc_len + stuffing_len,
822
                        buf + 4 + afc_len,
823
                        header_len - (4 + afc_len));
824
                buf[4] += stuffing_len;
825
                memset(buf + 4 + afc_len, 0xff, stuffing_len);
826
            } else {
827
                /* add stuffing */
828
                memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
829
                buf[3] |= 0x20;
830
                buf[4] = stuffing_len - 1;
831
                if (stuffing_len >= 2) {
832
                    buf[5] = 0x00;
833
                    memset(buf + 6, 0xff, stuffing_len - 2);
834
                }
835
            }
836
        }
837
        memcpy(buf + TS_PACKET_SIZE - len, payload, len);
838
        payload += len;
839
        payload_size -= len;
840
        put_buffer(s->pb, buf, TS_PACKET_SIZE);
841
    }
842
    put_flush_packet(s->pb);
843
}
844

    
845
static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
846
{
847
    AVStream *st = s->streams[pkt->stream_index];
848
    int size = pkt->size;
849
    uint8_t *buf= pkt->data;
850
    uint8_t *data= NULL;
851
    MpegTSWriteStream *ts_st = st->priv_data;
852
    const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
853
    int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
854

    
855
    if (pkt->pts != AV_NOPTS_VALUE)
856
        pts = pkt->pts + delay;
857
    if (pkt->dts != AV_NOPTS_VALUE)
858
        dts = pkt->dts + delay;
859

    
860
    if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
861
        av_log(s, AV_LOG_ERROR, "first pts value must set\n");
862
        return -1;
863
    }
864
    ts_st->first_pts_check = 0;
865

    
866
    if (st->codec->codec_id == CODEC_ID_H264) {
867
        const uint8_t *p = buf, *buf_end = p+size;
868
        uint32_t state = -1;
869

    
870
        if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
871
            av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, "
872
                   "no startcode found, use -vbsf h264_mp4toannexb\n");
873
            return -1;
874
        }
875

    
876
        do {
877
            p = ff_find_start_code(p, buf_end, &state);
878
            //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);
879
        } while (p < buf_end && (state & 0x1f) != 9 &&
880
                 (state & 0x1f) != 5 && (state & 0x1f) != 1);
881

    
882
        if ((state & 0x1f) != 9) { // AUD NAL
883
            data = av_malloc(pkt->size+6);
884
            if (!data)
885
                return -1;
886
            memcpy(data+6, pkt->data, pkt->size);
887
            AV_WB32(data, 0x00000001);
888
            data[4] = 0x09;
889
            data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
890
            buf  = data;
891
            size = pkt->size+6;
892
        }
893
    } else if (st->codec->codec_id == CODEC_ID_AAC) {
894
        if (pkt->size < 2)
895
            return -1;
896
        if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
897
            ADTSContext *adts = ts_st->adts;
898
            int new_size;
899
            if (!adts) {
900
                av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "
901
                       "and extradata missing\n");
902
                return -1;
903
            }
904
            new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;
905
            if ((unsigned)new_size >= INT_MAX)
906
                return -1;
907
            data = av_malloc(new_size);
908
            if (!data)
909
                return AVERROR(ENOMEM);
910
            ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size);
911
            if (adts->pce_size) {
912
                memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);
913
                adts->pce_size = 0;
914
            }
915
            memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);
916
            buf = data;
917
            size = new_size;
918
        }
919
    }
920

    
921
    if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
922
        // for video and subtitle, write a single pes packet
923
        mpegts_write_pes(s, st, buf, size, pts, dts);
924
        av_free(data);
925
        return 0;
926
    }
927

    
928
    if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {
929
        mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
930
                         ts_st->payload_pts, ts_st->payload_dts);
931
        ts_st->payload_index = 0;
932
    }
933

    
934
    if (!ts_st->payload_index) {
935
        ts_st->payload_pts = pts;
936
        ts_st->payload_dts = dts;
937
    }
938

    
939
    memcpy(ts_st->payload + ts_st->payload_index, buf, size);
940
    ts_st->payload_index += size;
941

    
942
    av_free(data);
943

    
944
    return 0;
945
}
946

    
947
static int mpegts_write_end(AVFormatContext *s)
948
{
949
    MpegTSWrite *ts = s->priv_data;
950
    MpegTSWriteStream *ts_st;
951
    MpegTSService *service;
952
    AVStream *st;
953
    int i;
954

    
955
    /* flush current packets */
956
    for(i = 0; i < s->nb_streams; i++) {
957
        st = s->streams[i];
958
        ts_st = st->priv_data;
959
        if (ts_st->payload_index > 0) {
960
            mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
961
                             ts_st->payload_pts, ts_st->payload_dts);
962
        }
963
        av_freep(&ts_st->adts);
964
    }
965
    put_flush_packet(s->pb);
966

    
967
    for(i = 0; i < ts->nb_services; i++) {
968
        service = ts->services[i];
969
        av_freep(&service->provider_name);
970
        av_freep(&service->name);
971
        av_free(service);
972
    }
973
    av_free(ts->services);
974

    
975
    return 0;
976
}
977

    
978
AVOutputFormat ff_mpegts_muxer = {
979
    "mpegts",
980
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
981
    "video/x-mpegts",
982
    "ts,m2t",
983
    sizeof(MpegTSWrite),
984
    CODEC_ID_MP2,
985
    CODEC_ID_MPEG2VIDEO,
986
    mpegts_write_header,
987
    mpegts_write_packet,
988
    mpegts_write_end,
989
    .priv_class = &mpegts_muxer_class,
990
};