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ffmpeg / libavformat / mpegtsenc.c @ c69d2241

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1 5dbafeb7 Fabrice Bellard
/*
2 7fbde343 Aurelien Jacobs
 * MPEG2 transport stream (aka DVB) muxer
3 406792e7 Diego Biurrun
 * Copyright (c) 2003 Fabrice Bellard
4 5dbafeb7 Fabrice Bellard
 *
5 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8 5dbafeb7 Fabrice Bellard
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 5dbafeb7 Fabrice Bellard
 *
12 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
13 5dbafeb7 Fabrice Bellard
 * 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 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
19 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 5dbafeb7 Fabrice Bellard
 */
21 245976da Diego Biurrun
22 6a5d31ac Diego Biurrun
#include "libavutil/bswap.h"
23 245976da Diego Biurrun
#include "libavutil/crc.h"
24 de34dc39 Baptiste Coudurier
#include "libavcodec/mpegvideo.h"
25 5dbafeb7 Fabrice Bellard
#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 b5931348 Baptiste Coudurier
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 5dbafeb7 Fabrice Bellard
/* NOTE: 4 bytes must be left at the end for the crc32 */
66 7b49ce2e Stefan Huehner
static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
67 5dbafeb7 Fabrice Bellard
{
68 b5931348 Baptiste Coudurier
    MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data;
69 5dbafeb7 Fabrice Bellard
    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 3abe5fbd Aurelien Jacobs
    crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
76 5dbafeb7 Fabrice Bellard
    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 115329f1 Diego Biurrun
81 5dbafeb7 Fabrice Bellard
    /* 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 3654a16d Baptiste Coudurier
        s->cc = (s->cc + 1) & 0xf;
94 5dbafeb7 Fabrice Bellard
        if (first)
95
            *q++ = 0; /* 0 offset */
96
        len1 = TS_PACKET_SIZE - (q - packet);
97 115329f1 Diego Biurrun
        if (len1 > len)
98 5dbafeb7 Fabrice Bellard
            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 b5931348 Baptiste Coudurier
111
        ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
112 5dbafeb7 Fabrice Bellard
    }
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 7b49ce2e Stefan Huehner
static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
125 5dbafeb7 Fabrice Bellard
                          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 115329f1 Diego Biurrun
131 5dbafeb7 Fabrice Bellard
    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 115329f1 Diego Biurrun
145 5dbafeb7 Fabrice Bellard
    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 69ef9450 Fabrice Bellard
#define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
165 5dbafeb7 Fabrice Bellard
166
/* we retransmit the SI info at this rate */
167
#define SDT_RETRANS_TIME 500
168
#define PAT_RETRANS_TIME 100
169 8b475508 Fabrice Bellard
#define PCR_RETRANS_TIME 20
170 5dbafeb7 Fabrice Bellard
171
typedef struct MpegTSWriteStream {
172 8b475508 Fabrice Bellard
    struct MpegTSService *service;
173 5dbafeb7 Fabrice Bellard
    int pid; /* stream associated pid */
174
    int cc;
175 69ef9450 Fabrice Bellard
    int payload_index;
176 b69017af Baptiste Coudurier
    int first_pts_check; ///< first pts check needed
177 69ef9450 Fabrice Bellard
    int64_t payload_pts;
178 700b9711 Måns Rullgård
    int64_t payload_dts;
179 69ef9450 Fabrice Bellard
    uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
180 5dbafeb7 Fabrice Bellard
} MpegTSWriteStream;
181
182
static void mpegts_write_pat(AVFormatContext *s)
183
{
184
    MpegTSWrite *ts = s->priv_data;
185
    MpegTSService *service;
186
    uint8_t data[1012], *q;
187
    int i;
188 115329f1 Diego Biurrun
189 5dbafeb7 Fabrice Bellard
    q = data;
190
    for(i = 0; i < ts->nb_services; i++) {
191
        service = ts->services[i];
192
        put16(&q, service->sid);
193
        put16(&q, 0xe000 | service->pmt.pid);
194
    }
195
    mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
196
                          data, q - data);
197
}
198
199
static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
200
{
201
    //    MpegTSWrite *ts = s->priv_data;
202
    uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
203
    int val, stream_type, i;
204
205
    q = data;
206
    put16(&q, 0xe000 | service->pcr_pid);
207
208
    program_info_length_ptr = q;
209
    q += 2; /* patched after */
210
211
    /* put program info here */
212
213
    val = 0xf000 | (q - program_info_length_ptr - 2);
214
    program_info_length_ptr[0] = val >> 8;
215
    program_info_length_ptr[1] = val;
216 115329f1 Diego Biurrun
217 5dbafeb7 Fabrice Bellard
    for(i = 0; i < s->nb_streams; i++) {
218
        AVStream *st = s->streams[i];
219
        MpegTSWriteStream *ts_st = st->priv_data;
220 4b358c3e Aurelien Jacobs
        AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0);
221 01f4895c Michael Niedermayer
        switch(st->codec->codec_id) {
222 278de475 Måns Rullgård
        case CODEC_ID_MPEG1VIDEO:
223
        case CODEC_ID_MPEG2VIDEO:
224
            stream_type = STREAM_TYPE_VIDEO_MPEG2;
225 5dbafeb7 Fabrice Bellard
            break;
226 278de475 Måns Rullgård
        case CODEC_ID_MPEG4:
227
            stream_type = STREAM_TYPE_VIDEO_MPEG4;
228
            break;
229
        case CODEC_ID_H264:
230
            stream_type = STREAM_TYPE_VIDEO_H264;
231
            break;
232 f4bba201 Anuradha Suraparaju
        case CODEC_ID_DIRAC:
233
            stream_type = STREAM_TYPE_VIDEO_DIRAC;
234
            break;
235 278de475 Måns Rullgård
        case CODEC_ID_MP2:
236
        case CODEC_ID_MP3:
237 ce34182d Michael Niedermayer
            stream_type = STREAM_TYPE_AUDIO_MPEG1;
238 5dbafeb7 Fabrice Bellard
            break;
239 278de475 Måns Rullgård
        case CODEC_ID_AAC:
240
            stream_type = STREAM_TYPE_AUDIO_AAC;
241
            break;
242
        case CODEC_ID_AC3:
243
            stream_type = STREAM_TYPE_AUDIO_AC3;
244
            break;
245 5dbafeb7 Fabrice Bellard
        default:
246
            stream_type = STREAM_TYPE_PRIVATE_DATA;
247
            break;
248
        }
249
        *q++ = stream_type;
250
        put16(&q, 0xe000 | ts_st->pid);
251
        desc_length_ptr = q;
252
        q += 2; /* patched after */
253
254
        /* write optional descriptors here */
255 01f4895c Michael Niedermayer
        switch(st->codec->codec_type) {
256 8b475508 Fabrice Bellard
        case CODEC_TYPE_AUDIO:
257 4b358c3e Aurelien Jacobs
            if (lang && strlen(lang->value) == 3) {
258 8b475508 Fabrice Bellard
                *q++ = 0x0a; /* ISO 639 language descriptor */
259
                *q++ = 4;
260 4b358c3e Aurelien Jacobs
                *q++ = lang->value[0];
261
                *q++ = lang->value[1];
262
                *q++ = lang->value[2];
263 8b475508 Fabrice Bellard
                *q++ = 0; /* undefined type */
264
            }
265
            break;
266
        case CODEC_TYPE_SUBTITLE:
267
            {
268
                const char *language;
269 4b358c3e Aurelien Jacobs
                language = lang && strlen(lang->value)==3 ? lang->value : "eng";
270 8b475508 Fabrice Bellard
                *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 f4bba201 Anuradha Suraparaju
        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 8b475508 Fabrice Bellard
        }
291 5dbafeb7 Fabrice Bellard
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 115329f1 Diego Biurrun
}
299 5dbafeb7 Fabrice Bellard
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 115329f1 Diego Biurrun
324 5dbafeb7 Fabrice Bellard
    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 115329f1 Diego Biurrun
        val = (running_status << 13) | (free_ca_mode << 12) |
347 5dbafeb7 Fabrice Bellard
            (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 115329f1 Diego Biurrun
static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
356
                                         int sid,
357
                                         const char *provider_name,
358 5dbafeb7 Fabrice Bellard
                                         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 899681cd Björn Axelsson
    put_buffer(ctx->pb, packet, TS_PACKET_SIZE);
378 5dbafeb7 Fabrice Bellard
}
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 4b358c3e Aurelien Jacobs
    AVMetadataTag *title;
387 5dbafeb7 Fabrice Bellard
    int i, total_bit_rate;
388 8b475508 Fabrice Bellard
    const char *service_name;
389 3d0a94f6 Baptiste Coudurier
    uint64_t sdt_size, pat_pmt_size, pos;
390 115329f1 Diego Biurrun
391 5dbafeb7 Fabrice Bellard
    ts->tsid = DEFAULT_TSID;
392
    ts->onid = DEFAULT_ONID;
393
    /* allocate a single DVB service */
394 4b358c3e Aurelien Jacobs
    title = av_metadata_get(s->metadata, "title", NULL, 0);
395
    service_name = title ? title->value : DEFAULT_SERVICE_NAME;
396 115329f1 Diego Biurrun
    service = mpegts_add_service(ts, DEFAULT_SID,
397 8b475508 Fabrice Bellard
                                 DEFAULT_PROVIDER_NAME, service_name);
398 5dbafeb7 Fabrice Bellard
    service->pmt.write_packet = section_write_packet;
399
    service->pmt.opaque = s;
400
401
    ts->pat.pid = PAT_PID;
402
    ts->pat.cc = 0;
403
    ts->pat.write_packet = section_write_packet;
404
    ts->pat.opaque = s;
405
406
    ts->sdt.pid = SDT_PID;
407
    ts->sdt.cc = 0;
408
    ts->sdt.write_packet = section_write_packet;
409
    ts->sdt.opaque = s;
410
411
    /* assign pids to each stream */
412
    total_bit_rate = 0;
413
    for(i = 0;i < s->nb_streams; i++) {
414
        st = s->streams[i];
415
        ts_st = av_mallocz(sizeof(MpegTSWriteStream));
416
        if (!ts_st)
417
            goto fail;
418
        st->priv_data = ts_st;
419 8b475508 Fabrice Bellard
        ts_st->service = service;
420 5dbafeb7 Fabrice Bellard
        ts_st->pid = DEFAULT_START_PID + i;
421 69ef9450 Fabrice Bellard
        ts_st->payload_pts = AV_NOPTS_VALUE;
422 700b9711 Måns Rullgård
        ts_st->payload_dts = AV_NOPTS_VALUE;
423 b69017af Baptiste Coudurier
        ts_st->first_pts_check = 1;
424 8b475508 Fabrice Bellard
        /* update PCR pid by using the first video stream */
425 115329f1 Diego Biurrun
        if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
426 5dbafeb7 Fabrice Bellard
            service->pcr_pid == 0x1fff)
427
            service->pcr_pid = ts_st->pid;
428 01f4895c Michael Niedermayer
        total_bit_rate += st->codec->bit_rate;
429 c69d2241 corp186
        /* PES header size */
430
        if (st->codec->codec_type == CODEC_TYPE_VIDEO ||
431
            st->codec->codec_type == CODEC_TYPE_SUBTITLE)
432
            total_bit_rate += 25 * 8 / av_q2d(st->codec->time_base);
433
        else
434
            total_bit_rate += total_bit_rate * 25 / DEFAULT_PES_PAYLOAD_SIZE;
435 5dbafeb7 Fabrice Bellard
    }
436 115329f1 Diego Biurrun
437 8b475508 Fabrice Bellard
    /* if no video stream, use the first stream as PCR */
438
    if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
439
        ts_st = s->streams[0]->priv_data;
440
        service->pcr_pid = ts_st->pid;
441
    }
442
443 5dbafeb7 Fabrice Bellard
    if (total_bit_rate <= 8 * 1024)
444
        total_bit_rate = 8 * 1024;
445 115329f1 Diego Biurrun
    service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /
446 8b475508 Fabrice Bellard
        (TS_PACKET_SIZE * 8 * 1000);
447 115329f1 Diego Biurrun
    ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /
448 5dbafeb7 Fabrice Bellard
        (TS_PACKET_SIZE * 8 * 1000);
449 115329f1 Diego Biurrun
    ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /
450 5dbafeb7 Fabrice Bellard
        (TS_PACKET_SIZE * 8 * 1000);
451
452 3d0a94f6 Baptiste Coudurier
    ts->mux_rate = 1; // avoid div by 0
453 b5931348 Baptiste Coudurier
454 5dbafeb7 Fabrice Bellard
    /* write info at the start of the file, so that it will be fast to
455
       find them */
456 3d0a94f6 Baptiste Coudurier
    pos = url_ftell(s->pb);
457 5dbafeb7 Fabrice Bellard
    mpegts_write_sdt(s);
458 3d0a94f6 Baptiste Coudurier
    sdt_size = url_ftell(s->pb) - pos;
459
    pos = url_ftell(s->pb);
460 5dbafeb7 Fabrice Bellard
    mpegts_write_pat(s);
461
    for(i = 0; i < ts->nb_services; i++) {
462
        mpegts_write_pmt(s, ts->services[i]);
463
    }
464 3d0a94f6 Baptiste Coudurier
    pat_pmt_size = url_ftell(s->pb) - pos;
465
466
    total_bit_rate +=
467 31df40a1 Baptiste Coudurier
        total_bit_rate *  4 / TS_PACKET_SIZE           + /* TS  header size */
468
        SDT_RETRANS_TIME * 8 * sdt_size     / 1000     + /* SDT size */
469
        PAT_RETRANS_TIME * 8 * pat_pmt_size / 1000     + /* PAT+PMT size */
470
        PCR_RETRANS_TIME * 8 * 8            / 1000;      /* PCR size */
471 3d0a94f6 Baptiste Coudurier
472
    av_log(s, AV_LOG_DEBUG, "muxrate %d freq sdt %d pat %d\n",
473
           total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
474
475
    if (s->mux_rate)
476
        ts->mux_rate = s->mux_rate;
477
    else
478
        ts->mux_rate = total_bit_rate;
479
480
    // adjust pcr
481
    ts->cur_pcr /= ts->mux_rate;
482
483 899681cd Björn Axelsson
    put_flush_packet(s->pb);
484 5dbafeb7 Fabrice Bellard
485
    return 0;
486
487
 fail:
488
    for(i = 0;i < s->nb_streams; i++) {
489
        st = s->streams[i];
490
        av_free(st->priv_data);
491
    }
492
    return -1;
493
}
494
495
/* send SDT, PAT and PMT tables regulary */
496
static void retransmit_si_info(AVFormatContext *s)
497
{
498
    MpegTSWrite *ts = s->priv_data;
499
    int i;
500
501
    if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
502
        ts->sdt_packet_count = 0;
503
        mpegts_write_sdt(s);
504
    }
505
    if (++ts->pat_packet_count == ts->pat_packet_freq) {
506
        ts->pat_packet_count = 0;
507
        mpegts_write_pat(s);
508
        for(i = 0; i < ts->nb_services; i++) {
509
            mpegts_write_pmt(s, ts->services[i]);
510
        }
511
    }
512
}
513
514 700b9711 Måns Rullgård
static void write_pts(uint8_t *q, int fourbits, int64_t pts)
515
{
516
    int val;
517
518
    val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
519
    *q++ = val;
520
    val = (((pts >> 15) & 0x7fff) << 1) | 1;
521
    *q++ = val >> 8;
522
    *q++ = val;
523
    val = (((pts) & 0x7fff) << 1) | 1;
524
    *q++ = val >> 8;
525
    *q++ = val;
526
}
527
528 69ef9450 Fabrice Bellard
/* NOTE: pes_data contains all the PES packet */
529
static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
530
                             const uint8_t *payload, int payload_size,
531 700b9711 Måns Rullgård
                             int64_t pts, int64_t dts)
532 5dbafeb7 Fabrice Bellard
{
533
    MpegTSWriteStream *ts_st = st->priv_data;
534 b5931348 Baptiste Coudurier
    MpegTSWrite *ts = s->priv_data;
535 69ef9450 Fabrice Bellard
    uint8_t buf[TS_PACKET_SIZE];
536 5dbafeb7 Fabrice Bellard
    uint8_t *q;
537 700b9711 Måns Rullgård
    int val, is_start, len, header_len, write_pcr, private_code, flags;
538 8b475508 Fabrice Bellard
    int afc_len, stuffing_len;
539
    int64_t pcr = -1; /* avoid warning */
540 5dbafeb7 Fabrice Bellard
541 69ef9450 Fabrice Bellard
    is_start = 1;
542
    while (payload_size > 0) {
543
        retransmit_si_info(s);
544 5dbafeb7 Fabrice Bellard
545 8b475508 Fabrice Bellard
        write_pcr = 0;
546
        if (ts_st->pid == ts_st->service->pcr_pid) {
547
            ts_st->service->pcr_packet_count++;
548 115329f1 Diego Biurrun
            if (ts_st->service->pcr_packet_count >=
549 8b475508 Fabrice Bellard
                ts_st->service->pcr_packet_freq) {
550
                ts_st->service->pcr_packet_count = 0;
551
                write_pcr = 1;
552
            }
553
        }
554
555 69ef9450 Fabrice Bellard
        /* prepare packet header */
556
        q = buf;
557
        *q++ = 0x47;
558
        val = (ts_st->pid >> 8);
559
        if (is_start)
560
            val |= 0x40;
561
        *q++ = val;
562
        *q++ = ts_st->pid;
563 8b475508 Fabrice Bellard
        *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
564 69ef9450 Fabrice Bellard
        ts_st->cc = (ts_st->cc + 1) & 0xf;
565 8b475508 Fabrice Bellard
        if (write_pcr) {
566 b5931348 Baptiste Coudurier
            // add 11, pcr references the last byte of program clock reference base
567
            pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate;
568 811a0aa7 Baptiste Coudurier
            if (dts != AV_NOPTS_VALUE && dts < pcr)
569
                av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
570 8b475508 Fabrice Bellard
            *q++ = 7; /* AFC length */
571
            *q++ = 0x10; /* flags: PCR present */
572
            *q++ = pcr >> 25;
573
            *q++ = pcr >> 17;
574
            *q++ = pcr >> 9;
575
            *q++ = pcr >> 1;
576
            *q++ = (pcr & 1) << 7;
577
            *q++ = 0;
578
        }
579 69ef9450 Fabrice Bellard
        if (is_start) {
580 f4bba201 Anuradha Suraparaju
            int pes_extension = 0;
581 69ef9450 Fabrice Bellard
            /* write PES header */
582
            *q++ = 0x00;
583
            *q++ = 0x00;
584
            *q++ = 0x01;
585 8b475508 Fabrice Bellard
            private_code = 0;
586 01f4895c Michael Niedermayer
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
587 f4bba201 Anuradha Suraparaju
                if (st->codec->codec_id == CODEC_ID_DIRAC) {
588
                    *q++ = 0xfd;
589
                } else
590
                    *q++ = 0xe0;
591 01f4895c Michael Niedermayer
            } else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&
592
                       (st->codec->codec_id == CODEC_ID_MP2 ||
593
                        st->codec->codec_id == CODEC_ID_MP3)) {
594 115329f1 Diego Biurrun
                *q++ = 0xc0;
595 8b475508 Fabrice Bellard
            } else {
596
                *q++ = 0xbd;
597 01f4895c Michael Niedermayer
                if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
598 8b475508 Fabrice Bellard
                    private_code = 0x20;
599
                }
600
            }
601 700b9711 Måns Rullgård
            header_len = 0;
602
            flags = 0;
603
            if (pts != AV_NOPTS_VALUE) {
604
                header_len += 5;
605
                flags |= 0x80;
606
            }
607 8f14cdee Baptiste Coudurier
            if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
608 700b9711 Måns Rullgård
                header_len += 5;
609
                flags |= 0x40;
610
            }
611 f4bba201 Anuradha Suraparaju
            if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
612
                st->codec->codec_id == CODEC_ID_DIRAC) {
613
                /* set PES_extension_flag */
614
                pes_extension = 1;
615
                flags |= 0x01;
616
617
                /*
618
                * One byte for PES2 extension flag +
619
                * one byte for extension length +
620
                * one byte for extension id
621
                */
622
                header_len += 3;
623
            }
624 700b9711 Måns Rullgård
            len = payload_size + header_len + 3;
625 8b475508 Fabrice Bellard
            if (private_code != 0)
626 700b9711 Måns Rullgård
                len++;
627 e4358e70 Baptiste Coudurier
            if (len > 0xffff)
628
                len = 0;
629 69ef9450 Fabrice Bellard
            *q++ = len >> 8;
630
            *q++ = len;
631 8b475508 Fabrice Bellard
            val = 0x80;
632
            /* data alignment indicator is required for subtitle data */
633 01f4895c Michael Niedermayer
            if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
634 8b475508 Fabrice Bellard
                val |= 0x04;
635
            *q++ = val;
636 700b9711 Måns Rullgård
            *q++ = flags;
637
            *q++ = header_len;
638 69ef9450 Fabrice Bellard
            if (pts != AV_NOPTS_VALUE) {
639 700b9711 Måns Rullgård
                write_pts(q, flags >> 6, pts);
640
                q += 5;
641
            }
642 8f14cdee Baptiste Coudurier
            if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
643 700b9711 Måns Rullgård
                write_pts(q, 1, dts);
644
                q += 5;
645 5dbafeb7 Fabrice Bellard
            }
646 f4bba201 Anuradha Suraparaju
            if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
647
                flags = 0x01;  /* set PES_extension_flag_2 */
648
                *q++ = flags;
649
                *q++ = 0x80 | 0x01;  /* marker bit + extension length */
650
                /*
651
                * Set the stream id extension flag bit to 0 and
652
                * write the extended stream id
653
                */
654
                *q++ = 0x00 | 0x60;
655
            }
656 8b475508 Fabrice Bellard
            if (private_code != 0)
657
                *q++ = private_code;
658 69ef9450 Fabrice Bellard
            is_start = 0;
659 5dbafeb7 Fabrice Bellard
        }
660 8b475508 Fabrice Bellard
        /* header size */
661
        header_len = q - buf;
662
        /* data len */
663
        len = TS_PACKET_SIZE - header_len;
664 69ef9450 Fabrice Bellard
        if (len > payload_size)
665
            len = payload_size;
666 8b475508 Fabrice Bellard
        stuffing_len = TS_PACKET_SIZE - header_len - len;
667
        if (stuffing_len > 0) {
668
            /* add stuffing with AFC */
669
            if (buf[3] & 0x20) {
670
                /* stuffing already present: increase its size */
671
                afc_len = buf[4] + 1;
672
                memmove(buf + 4 + afc_len + stuffing_len,
673 115329f1 Diego Biurrun
                        buf + 4 + afc_len,
674 8b475508 Fabrice Bellard
                        header_len - (4 + afc_len));
675
                buf[4] += stuffing_len;
676
                memset(buf + 4 + afc_len, 0xff, stuffing_len);
677
            } else {
678
                /* add stuffing */
679
                memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
680
                buf[3] |= 0x20;
681
                buf[4] = stuffing_len - 1;
682
                if (stuffing_len >= 2) {
683
                    buf[5] = 0x00;
684
                    memset(buf + 6, 0xff, stuffing_len - 2);
685
                }
686
            }
687
        }
688
        memcpy(buf + TS_PACKET_SIZE - len, payload, len);
689 69ef9450 Fabrice Bellard
        payload += len;
690
        payload_size -= len;
691 899681cd Björn Axelsson
        put_buffer(s->pb, buf, TS_PACKET_SIZE);
692 b5931348 Baptiste Coudurier
        ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
693 5dbafeb7 Fabrice Bellard
    }
694 899681cd Björn Axelsson
    put_flush_packet(s->pb);
695 69ef9450 Fabrice Bellard
}
696
697 e928649b Michael Niedermayer
static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
698 69ef9450 Fabrice Bellard
{
699 e928649b Michael Niedermayer
    AVStream *st = s->streams[pkt->stream_index];
700 1e885788 Baptiste Coudurier
    int len, size = pkt->size;
701 e928649b Michael Niedermayer
    uint8_t *buf= pkt->data;
702 a57fb91c Baptiste Coudurier
    uint8_t *data= NULL;
703 69ef9450 Fabrice Bellard
    MpegTSWriteStream *ts_st = st->priv_data;
704 de34dc39 Baptiste Coudurier
    const uint8_t *access_unit_index = NULL;
705 46911c7a Baptiste Coudurier
    const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
706 f3ba7c54 Baptiste Coudurier
    int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
707
708
    if (pkt->pts != AV_NOPTS_VALUE)
709
        pts = pkt->pts + delay;
710
    if (pkt->dts != AV_NOPTS_VALUE)
711
        dts = pkt->dts + delay;
712 69ef9450 Fabrice Bellard
713 b69017af Baptiste Coudurier
    if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
714
        av_log(s, AV_LOG_ERROR, "first pts value must set\n");
715
        return -1;
716
    }
717
    ts_st->first_pts_check = 0;
718
719 e4358e70 Baptiste Coudurier
    if (st->codec->codec_id == CODEC_ID_H264) {
720 a57fb91c Baptiste Coudurier
        if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
721
            av_log(s, AV_LOG_ERROR, "h264 bitstream malformated\n");
722
            return -1;
723
        }
724
        if (pkt->data[4] != 0x09) { // AUD NAL
725
            data = av_malloc(pkt->size+6);
726
            if (!data)
727
                return -1;
728
            memcpy(data+6, pkt->data, pkt->size);
729
            AV_WB32(data, 0x00000001);
730
            data[4] = 0x09;
731
            data[5] = 0xe0; // any slice type
732
            buf  = data;
733
            size = pkt->size+6;
734
        }
735
        access_unit_index = buf;
736 89ac55ad Baptiste Coudurier
    } else {
737 de34dc39 Baptiste Coudurier
        access_unit_index = pkt->data;
738
    }
739
740
    if (!access_unit_index) {
741
        av_log(s, AV_LOG_ERROR, "error, could not find access unit start\n");
742
        return -1;
743
    }
744
745 e4358e70 Baptiste Coudurier
    if (st->codec->codec_type == CODEC_TYPE_SUBTITLE ||
746
        st->codec->codec_type == CODEC_TYPE_VIDEO) {
747
        // for video and subtitle, write a single pes packet
748
        mpegts_write_pes(s, st, buf, size, pts, dts);
749 24ac5052 Baptiste Coudurier
        av_free(data);
750 e4358e70 Baptiste Coudurier
        return 0;
751
    }
752
753
    // audio
754 69ef9450 Fabrice Bellard
    while (size > 0) {
755 1e885788 Baptiste Coudurier
        len = DEFAULT_PES_PAYLOAD_SIZE - ts_st->payload_index;
756 69ef9450 Fabrice Bellard
        if (len > size)
757
            len = size;
758
        memcpy(ts_st->payload + ts_st->payload_index, buf, len);
759
        buf += len;
760
        size -= len;
761
        ts_st->payload_index += len;
762 de34dc39 Baptiste Coudurier
        if (access_unit_index && access_unit_index < buf &&
763
            ts_st->payload_pts == AV_NOPTS_VALUE &&
764
            ts_st->payload_dts == AV_NOPTS_VALUE) {
765 f3ba7c54 Baptiste Coudurier
            ts_st->payload_dts = dts;
766
            ts_st->payload_pts = pts;
767 de34dc39 Baptiste Coudurier
        }
768 1e885788 Baptiste Coudurier
        if (ts_st->payload_index >= DEFAULT_PES_PAYLOAD_SIZE) {
769 69ef9450 Fabrice Bellard
            mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
770 700b9711 Måns Rullgård
                             ts_st->payload_pts, ts_st->payload_dts);
771 69ef9450 Fabrice Bellard
            ts_st->payload_pts = AV_NOPTS_VALUE;
772 700b9711 Måns Rullgård
            ts_st->payload_dts = AV_NOPTS_VALUE;
773 69ef9450 Fabrice Bellard
            ts_st->payload_index = 0;
774 de34dc39 Baptiste Coudurier
            access_unit_index = NULL; // unset access unit to avoid setting pts/dts again
775 69ef9450 Fabrice Bellard
        }
776
    }
777 a57fb91c Baptiste Coudurier
778 5dbafeb7 Fabrice Bellard
    return 0;
779
}
780
781
static int mpegts_write_end(AVFormatContext *s)
782
{
783
    MpegTSWrite *ts = s->priv_data;
784
    MpegTSWriteStream *ts_st;
785
    MpegTSService *service;
786
    AVStream *st;
787
    int i;
788
789
    /* flush current packets */
790
    for(i = 0; i < s->nb_streams; i++) {
791
        st = s->streams[i];
792
        ts_st = st->priv_data;
793 69ef9450 Fabrice Bellard
        if (ts_st->payload_index > 0) {
794
            mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
795 700b9711 Måns Rullgård
                             ts_st->payload_pts, ts_st->payload_dts);
796 5dbafeb7 Fabrice Bellard
        }
797
    }
798 899681cd Björn Axelsson
    put_flush_packet(s->pb);
799 115329f1 Diego Biurrun
800 5dbafeb7 Fabrice Bellard
    for(i = 0; i < ts->nb_services; i++) {
801
        service = ts->services[i];
802
        av_freep(&service->provider_name);
803
        av_freep(&service->name);
804
        av_free(service);
805
    }
806
    av_free(ts->services);
807
808
    return 0;
809
}
810
811 d2a067d1 Måns Rullgård
AVOutputFormat mpegts_muxer = {
812 5dbafeb7 Fabrice Bellard
    "mpegts",
813 bde15e74 Stefano Sabatini
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
814 5dbafeb7 Fabrice Bellard
    "video/x-mpegts",
815 d3ad044a Baptiste Coudurier
    "ts,m2t",
816 5dbafeb7 Fabrice Bellard
    sizeof(MpegTSWrite),
817
    CODEC_ID_MP2,
818 69ef9450 Fabrice Bellard
    CODEC_ID_MPEG2VIDEO,
819 5dbafeb7 Fabrice Bellard
    mpegts_write_header,
820
    mpegts_write_packet,
821
    mpegts_write_end,
822
};