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1
/*
2
 * MPEG2 transport stream (aka DVB) mux
3
 * Copyright (c) 2003 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avformat.h"
20

    
21
#include "mpegts.h"
22

    
23
/* write DVB SI sections */
24

    
25
static const uint32_t crc_table[256] = {
26
        0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
27
        0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
28
        0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
29
        0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
30
        0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
31
        0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
32
        0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
33
        0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
34
        0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
35
        0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
36
        0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
37
        0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
38
        0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
39
        0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
40
        0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
41
        0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
42
        0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
43
        0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
44
        0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
45
        0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
46
        0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
47
        0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
48
        0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
49
        0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
50
        0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
51
        0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
52
        0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
53
        0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
54
        0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
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        0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
56
        0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
57
        0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
58
        0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
59
        0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
60
        0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
61
        0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
62
        0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
63
        0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
64
        0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
65
        0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
66
        0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
67
        0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
68
        0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
69
};
70

    
71
unsigned int mpegts_crc32(const uint8_t *data, int len)
72
{
73
    register int i;
74
    unsigned int crc = 0xffffffff;
75
    
76
    for (i=0; i<len; i++)
77
        crc = (crc << 8) ^ crc_table[((crc >> 24) ^ *data++) & 0xff];
78
    
79
    return crc;
80
}
81

    
82
/*********************************************/
83
/* mpegts section writer */
84

    
85
typedef struct MpegTSSection {
86
    int pid;
87
    int cc;
88
    void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
89
    void *opaque;
90
} MpegTSSection;
91

    
92
/* NOTE: 4 bytes must be left at the end for the crc32 */
93
void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
94
{
95
    unsigned int crc;
96
    unsigned char packet[TS_PACKET_SIZE];
97
    const unsigned char *buf_ptr;
98
    unsigned char *q;
99
    int first, b, len1, left;
100

    
101
    crc = mpegts_crc32(buf, len - 4);
102
    buf[len - 4] = (crc >> 24) & 0xff;
103
    buf[len - 3] = (crc >> 16) & 0xff;
104
    buf[len - 2] = (crc >> 8) & 0xff;
105
    buf[len - 1] = (crc) & 0xff;
106
    
107
    /* send each packet */
108
    buf_ptr = buf;
109
    while (len > 0) {
110
        first = (buf == buf_ptr);
111
        q = packet;
112
        *q++ = 0x47;
113
        b = (s->pid >> 8);
114
        if (first)
115
            b |= 0x40;
116
        *q++ = b;
117
        *q++ = s->pid;
118
        s->cc = (s->cc + 1) & 0xf;
119
        *q++ = 0x10 | s->cc;
120
        if (first)
121
            *q++ = 0; /* 0 offset */
122
        len1 = TS_PACKET_SIZE - (q - packet);
123
        if (len1 > len) 
124
            len1 = len;
125
        memcpy(q, buf_ptr, len1);
126
        q += len1;
127
        /* add known padding data */
128
        left = TS_PACKET_SIZE - (q - packet);
129
        if (left > 0)
130
            memset(q, 0xff, left);
131

    
132
        s->write_packet(s, packet);
133

    
134
        buf_ptr += len1;
135
        len -= len1;
136
    }
137
}
138

    
139
static inline void put16(uint8_t **q_ptr, int val)
140
{
141
    uint8_t *q;
142
    q = *q_ptr;
143
    *q++ = val >> 8;
144
    *q++ = val;
145
    *q_ptr = q;
146
}
147

    
148
int mpegts_write_section1(MpegTSSection *s, int tid, int id, 
149
                          int version, int sec_num, int last_sec_num,
150
                          uint8_t *buf, int len)
151
{
152
    uint8_t section[1024], *q;
153
    unsigned int tot_len;
154
    
155
    tot_len = 3 + 5 + len + 4;
156
    /* check if not too big */
157
    if (tot_len > 1024)
158
        return -1;
159

    
160
    q = section;
161
    *q++ = tid;
162
    put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
163
    put16(&q, id);
164
    *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
165
    *q++ = sec_num;
166
    *q++ = last_sec_num;
167
    memcpy(q, buf, len);
168
    
169
    mpegts_write_section(s, section, tot_len);
170
    return 0;
171
}
172

    
173
/*********************************************/
174
/* mpegts writer */
175

    
176
#define DEFAULT_PMT_START_PID   0x1000
177
#define DEFAULT_START_PID       0x0100
178
#define DEFAULT_PROVIDER_NAME   "FFmpeg"
179
#define DEFAULT_SERVICE_NAME    "Service01"
180

    
181
/* default network id, transport stream and service identifiers */
182
#define DEFAULT_ONID            0x0001
183
#define DEFAULT_TSID            0x0001
184
#define DEFAULT_SID             0x0001
185

    
186
/* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
187
#define DEFAULT_PES_HEADER_FREQ 16
188
#define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
189

    
190
/* we retransmit the SI info at this rate */
191
#define SDT_RETRANS_TIME 500
192
#define PAT_RETRANS_TIME 100
193
#define PCR_RETRANS_TIME 20
194

    
195
typedef struct MpegTSWriteStream {
196
    struct MpegTSService *service;
197
    int pid; /* stream associated pid */
198
    int cc;
199
    int payload_index;
200
    int64_t payload_pts;
201
    uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
202
} MpegTSWriteStream;
203

    
204
typedef struct MpegTSService {
205
    MpegTSSection pmt; /* MPEG2 pmt table context */
206
    int sid;           /* service ID */
207
    char *name;
208
    char *provider_name;
209
    int pcr_pid;
210
    int pcr_packet_count;
211
    int pcr_packet_freq;
212
} MpegTSService;
213

    
214
typedef struct MpegTSWrite {
215
    MpegTSSection pat; /* MPEG2 pat table */
216
    MpegTSSection sdt; /* MPEG2 sdt table context */
217
    MpegTSService **services;
218
    int sdt_packet_count;
219
    int sdt_packet_freq;
220
    int pat_packet_count;
221
    int pat_packet_freq;
222
    int nb_services;
223
    int onid;
224
    int tsid;
225
} MpegTSWrite;
226

    
227
static void mpegts_write_pat(AVFormatContext *s)
228
{
229
    MpegTSWrite *ts = s->priv_data;
230
    MpegTSService *service;
231
    uint8_t data[1012], *q;
232
    int i;
233
    
234
    q = data;
235
    for(i = 0; i < ts->nb_services; i++) {
236
        service = ts->services[i];
237
        put16(&q, service->sid);
238
        put16(&q, 0xe000 | service->pmt.pid);
239
    }
240
    mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
241
                          data, q - data);
242
}
243

    
244
static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
245
{
246
    //    MpegTSWrite *ts = s->priv_data;
247
    uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
248
    int val, stream_type, i;
249

    
250
    q = data;
251
    put16(&q, 0xe000 | service->pcr_pid);
252

    
253
    program_info_length_ptr = q;
254
    q += 2; /* patched after */
255

    
256
    /* put program info here */
257

    
258
    val = 0xf000 | (q - program_info_length_ptr - 2);
259
    program_info_length_ptr[0] = val >> 8;
260
    program_info_length_ptr[1] = val;
261
    
262
    for(i = 0; i < s->nb_streams; i++) {
263
        AVStream *st = s->streams[i];
264
        MpegTSWriteStream *ts_st = st->priv_data;
265
        switch(st->codec->codec_id) {
266
        case CODEC_ID_MPEG1VIDEO:
267
        case CODEC_ID_MPEG2VIDEO:
268
            stream_type = STREAM_TYPE_VIDEO_MPEG2;
269
            break;
270
        case CODEC_ID_MPEG4:
271
            stream_type = STREAM_TYPE_VIDEO_MPEG4;
272
            break;
273
        case CODEC_ID_H264:
274
            stream_type = STREAM_TYPE_VIDEO_H264;
275
            break;
276
        case CODEC_ID_MP2:
277
        case CODEC_ID_MP3:
278
            stream_type = STREAM_TYPE_AUDIO_MPEG1;
279
            break;
280
        case CODEC_ID_AAC:
281
            stream_type = STREAM_TYPE_AUDIO_AAC;
282
            break;
283
        case CODEC_ID_AC3:
284
            stream_type = STREAM_TYPE_AUDIO_AC3;
285
            break;
286
        default:
287
            stream_type = STREAM_TYPE_PRIVATE_DATA;
288
            break;
289
        }
290
        *q++ = stream_type;
291
        put16(&q, 0xe000 | ts_st->pid);
292
        desc_length_ptr = q;
293
        q += 2; /* patched after */
294

    
295
        /* write optional descriptors here */
296
        switch(st->codec->codec_type) {
297
        case CODEC_TYPE_AUDIO:
298
            if (strlen(st->language) == 3) {
299
                *q++ = 0x0a; /* ISO 639 language descriptor */
300
                *q++ = 4;
301
                *q++ = st->language[0];
302
                *q++ = st->language[1];
303
                *q++ = st->language[2];
304
                *q++ = 0; /* undefined type */
305
            }
306
            break;
307
        case CODEC_TYPE_SUBTITLE:
308
            {
309
                const char *language;
310
                language = st->language;
311
                if (strlen(language) != 3)
312
                    language = "eng";
313
                *q++ = 0x59;
314
                *q++ = 8;
315
                *q++ = language[0];
316
                *q++ = language[1];
317
                *q++ = language[2];
318
                *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
319
                put16(&q, 1); /* page id */
320
                put16(&q, 1); /* ancillary page id */
321
            }
322
            break;
323
        }
324

    
325
        val = 0xf000 | (q - desc_length_ptr - 2);
326
        desc_length_ptr[0] = val >> 8;
327
        desc_length_ptr[1] = val;
328
    }
329
    mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
330
                          data, q - data);
331
}   
332

    
333
/* NOTE: str == NULL is accepted for an empty string */
334
static void putstr8(uint8_t **q_ptr, const char *str)
335
{
336
    uint8_t *q;
337
    int len;
338

    
339
    q = *q_ptr;
340
    if (!str)
341
        len = 0;
342
    else
343
        len = strlen(str);
344
    *q++ = len;
345
    memcpy(q, str, len);
346
    q += len;
347
    *q_ptr = q;
348
}
349

    
350
static void mpegts_write_sdt(AVFormatContext *s)
351
{
352
    MpegTSWrite *ts = s->priv_data;
353
    MpegTSService *service;
354
    uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
355
    int i, running_status, free_ca_mode, val;
356
    
357
    q = data;
358
    put16(&q, ts->onid);
359
    *q++ = 0xff;
360
    for(i = 0; i < ts->nb_services; i++) {
361
        service = ts->services[i];
362
        put16(&q, service->sid);
363
        *q++ = 0xfc | 0x00; /* currently no EIT info */
364
        desc_list_len_ptr = q;
365
        q += 2;
366
        running_status = 4; /* running */
367
        free_ca_mode = 0;
368

    
369
        /* write only one descriptor for the service name and provider */
370
        *q++ = 0x48;
371
        desc_len_ptr = q;
372
        q++;
373
        *q++ = 0x01; /* digital television service */
374
        putstr8(&q, service->provider_name);
375
        putstr8(&q, service->name);
376
        desc_len_ptr[0] = q - desc_len_ptr - 1;
377

    
378
        /* fill descriptor length */
379
        val = (running_status << 13) | (free_ca_mode << 12) | 
380
            (q - desc_list_len_ptr - 2);
381
        desc_list_len_ptr[0] = val >> 8;
382
        desc_list_len_ptr[1] = val;
383
    }
384
    mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
385
                          data, q - data);
386
}
387

    
388
static MpegTSService *mpegts_add_service(MpegTSWrite *ts, 
389
                                         int sid, 
390
                                         const char *provider_name, 
391
                                         const char *name)
392
{
393
    MpegTSService *service;
394

    
395
    service = av_mallocz(sizeof(MpegTSService));
396
    if (!service)
397
        return NULL;
398
    service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
399
    service->sid = sid;
400
    service->provider_name = av_strdup(provider_name);
401
    service->name = av_strdup(name);
402
    service->pcr_pid = 0x1fff;
403
    dynarray_add(&ts->services, &ts->nb_services, service);
404
    return service;
405
}
406

    
407
static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
408
{
409
    AVFormatContext *ctx = s->opaque;
410
    put_buffer(&ctx->pb, packet, TS_PACKET_SIZE);
411
}
412

    
413
static int mpegts_write_header(AVFormatContext *s)
414
{
415
    MpegTSWrite *ts = s->priv_data;
416
    MpegTSWriteStream *ts_st;
417
    MpegTSService *service;
418
    AVStream *st;
419
    int i, total_bit_rate;
420
    const char *service_name;
421
    
422
    ts->tsid = DEFAULT_TSID;
423
    ts->onid = DEFAULT_ONID;
424
    /* allocate a single DVB service */
425
    service_name = s->title;
426
    if (service_name[0] == '\0')
427
        service_name = DEFAULT_SERVICE_NAME;
428
    service = mpegts_add_service(ts, DEFAULT_SID, 
429
                                 DEFAULT_PROVIDER_NAME, service_name);
430
    service->pmt.write_packet = section_write_packet;
431
    service->pmt.opaque = s;
432

    
433
    ts->pat.pid = PAT_PID;
434
    ts->pat.cc = 0;
435
    ts->pat.write_packet = section_write_packet;
436
    ts->pat.opaque = s;
437

    
438
    ts->sdt.pid = SDT_PID;
439
    ts->sdt.cc = 0;
440
    ts->sdt.write_packet = section_write_packet;
441
    ts->sdt.opaque = s;
442

    
443
    /* assign pids to each stream */
444
    total_bit_rate = 0;
445
    for(i = 0;i < s->nb_streams; i++) {
446
        st = s->streams[i];
447
        ts_st = av_mallocz(sizeof(MpegTSWriteStream));
448
        if (!ts_st)
449
            goto fail;
450
        st->priv_data = ts_st;
451
        ts_st->service = service;
452
        ts_st->pid = DEFAULT_START_PID + i;
453
        ts_st->payload_pts = AV_NOPTS_VALUE;
454
        /* update PCR pid by using the first video stream */
455
        if (st->codec->codec_type == CODEC_TYPE_VIDEO && 
456
            service->pcr_pid == 0x1fff)
457
            service->pcr_pid = ts_st->pid;
458
        total_bit_rate += st->codec->bit_rate;
459
    }
460
    
461
    /* if no video stream, use the first stream as PCR */
462
    if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
463
        ts_st = s->streams[0]->priv_data;
464
        service->pcr_pid = ts_st->pid;
465
    }
466

    
467
    if (total_bit_rate <= 8 * 1024)
468
        total_bit_rate = 8 * 1024;
469
    service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) / 
470
        (TS_PACKET_SIZE * 8 * 1000);
471
    ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) / 
472
        (TS_PACKET_SIZE * 8 * 1000);
473
    ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) / 
474
        (TS_PACKET_SIZE * 8 * 1000);
475
#if 0
476
    printf("%d %d %d\n", 
477
           total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
478
#endif
479

    
480
    /* write info at the start of the file, so that it will be fast to
481
       find them */
482
    mpegts_write_sdt(s);
483
    mpegts_write_pat(s);
484
    for(i = 0; i < ts->nb_services; i++) {
485
        mpegts_write_pmt(s, ts->services[i]);
486
    }
487
    put_flush_packet(&s->pb);
488

    
489
    return 0;
490

    
491
 fail:
492
    for(i = 0;i < s->nb_streams; i++) {
493
        st = s->streams[i];
494
        av_free(st->priv_data);
495
    }
496
    return -1;
497
}
498

    
499
/* send SDT, PAT and PMT tables regulary */
500
static void retransmit_si_info(AVFormatContext *s)
501
{
502
    MpegTSWrite *ts = s->priv_data;
503
    int i;
504

    
505
    if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
506
        ts->sdt_packet_count = 0;
507
        mpegts_write_sdt(s);
508
    }
509
    if (++ts->pat_packet_count == ts->pat_packet_freq) {
510
        ts->pat_packet_count = 0;
511
        mpegts_write_pat(s);
512
        for(i = 0; i < ts->nb_services; i++) {
513
            mpegts_write_pmt(s, ts->services[i]);
514
        }
515
    }
516
}
517

    
518
/* NOTE: pes_data contains all the PES packet */
519
static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
520
                             const uint8_t *payload, int payload_size,
521
                             int64_t pts)
522
{
523
    MpegTSWriteStream *ts_st = st->priv_data;
524
    uint8_t buf[TS_PACKET_SIZE];
525
    uint8_t *q;
526
    int val, is_start, len, header_len, write_pcr, private_code;
527
    int afc_len, stuffing_len;
528
    int64_t pcr = -1; /* avoid warning */
529

    
530
    is_start = 1;
531
    while (payload_size > 0) {
532
        retransmit_si_info(s);
533

    
534
        write_pcr = 0;
535
        if (ts_st->pid == ts_st->service->pcr_pid) {
536
            ts_st->service->pcr_packet_count++;
537
            if (ts_st->service->pcr_packet_count >= 
538
                ts_st->service->pcr_packet_freq) {
539
                ts_st->service->pcr_packet_count = 0;
540
                write_pcr = 1;
541
                /* XXX: this is incorrect, but at least we have a PCR
542
                   value */
543
                pcr = pts;
544
            }
545
        }
546

    
547
        /* prepare packet header */
548
        q = buf;
549
        *q++ = 0x47;
550
        val = (ts_st->pid >> 8);
551
        if (is_start)
552
            val |= 0x40;
553
        *q++ = val;
554
        *q++ = ts_st->pid;
555
        *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
556
        ts_st->cc = (ts_st->cc + 1) & 0xf;
557
        if (write_pcr) {
558
            *q++ = 7; /* AFC length */
559
            *q++ = 0x10; /* flags: PCR present */
560
            *q++ = pcr >> 25;
561
            *q++ = pcr >> 17;
562
            *q++ = pcr >> 9;
563
            *q++ = pcr >> 1;
564
            *q++ = (pcr & 1) << 7;
565
            *q++ = 0;
566
        }
567
        if (is_start) {
568
            /* write PES header */
569
            *q++ = 0x00;
570
            *q++ = 0x00;
571
            *q++ = 0x01;
572
            private_code = 0;
573
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
574
                *q++ = 0xe0;
575
            } else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&
576
                       (st->codec->codec_id == CODEC_ID_MP2 ||
577
                        st->codec->codec_id == CODEC_ID_MP3)) {
578
                *q++ = 0xc0; 
579
            } else {
580
                *q++ = 0xbd;
581
                if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
582
                    private_code = 0x20;
583
                }
584
            }
585
            if (pts != AV_NOPTS_VALUE)
586
                header_len = 8;
587
            else
588
                header_len = 3;
589
            if (private_code != 0)
590
                header_len++;
591
            len = payload_size + header_len;
592
            *q++ = len >> 8;
593
            *q++ = len;
594
            val = 0x80;
595
            /* data alignment indicator is required for subtitle data */
596
            if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
597
                val |= 0x04;
598
            *q++ = val;
599
            if (pts != AV_NOPTS_VALUE) {
600
                *q++ = 0x80; /* PTS only */
601
                *q++ = 0x05; /* header len */
602
                val = (0x02 << 4) | 
603
                    (((pts >> 30) & 0x07) << 1) | 1;
604
                *q++ = val;
605
                val = (((pts >> 15) & 0x7fff) << 1) | 1;
606
                *q++ = val >> 8;
607
                *q++ = val;
608
                val = (((pts) & 0x7fff) << 1) | 1;
609
                *q++ = val >> 8;
610
                *q++ = val;
611
            } else {
612
                *q++ = 0x00;
613
                *q++ = 0x00;
614
            }
615
            if (private_code != 0)
616
                *q++ = private_code;
617
            is_start = 0;
618
        }
619
        /* header size */
620
        header_len = q - buf;
621
        /* data len */
622
        len = TS_PACKET_SIZE - header_len;
623
        if (len > payload_size)
624
            len = payload_size;
625
        stuffing_len = TS_PACKET_SIZE - header_len - len;
626
        if (stuffing_len > 0) {
627
            /* add stuffing with AFC */
628
            if (buf[3] & 0x20) {
629
                /* stuffing already present: increase its size */
630
                afc_len = buf[4] + 1;
631
                memmove(buf + 4 + afc_len + stuffing_len,
632
                        buf + 4 + afc_len, 
633
                        header_len - (4 + afc_len));
634
                buf[4] += stuffing_len;
635
                memset(buf + 4 + afc_len, 0xff, stuffing_len);
636
            } else {
637
                /* add stuffing */
638
                memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
639
                buf[3] |= 0x20;
640
                buf[4] = stuffing_len - 1;
641
                if (stuffing_len >= 2) {
642
                    buf[5] = 0x00;
643
                    memset(buf + 6, 0xff, stuffing_len - 2);
644
                }
645
            }
646
        }
647
        memcpy(buf + TS_PACKET_SIZE - len, payload, len);
648
        payload += len;
649
        payload_size -= len;
650
        put_buffer(&s->pb, buf, TS_PACKET_SIZE);
651
    }
652
    put_flush_packet(&s->pb);
653
}
654

    
655
static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
656
{
657
    AVStream *st = s->streams[pkt->stream_index];
658
    int size= pkt->size;
659
    uint8_t *buf= pkt->data;
660
    MpegTSWriteStream *ts_st = st->priv_data;
661
    int len, max_payload_size;
662

    
663
    if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
664
        /* for subtitle, a single PES packet must be generated */
665
        mpegts_write_pes(s, st, buf, size, pkt->pts);
666
        return 0;
667
    }
668
    
669
    max_payload_size = DEFAULT_PES_PAYLOAD_SIZE;
670
    while (size > 0) {
671
        len = max_payload_size - ts_st->payload_index;
672
        if (len > size)
673
            len = size;
674
        memcpy(ts_st->payload + ts_st->payload_index, buf, len);
675
        buf += len;
676
        size -= len;
677
        ts_st->payload_index += len;
678
        if (ts_st->payload_pts == AV_NOPTS_VALUE)
679
            ts_st->payload_pts = pkt->pts;
680
        if (ts_st->payload_index >= max_payload_size) {
681
            mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
682
                             ts_st->payload_pts);
683
            ts_st->payload_pts = AV_NOPTS_VALUE;
684
            ts_st->payload_index = 0;
685
        }
686
    }
687
    return 0;
688
}
689

    
690
static int mpegts_write_end(AVFormatContext *s)
691
{
692
    MpegTSWrite *ts = s->priv_data;
693
    MpegTSWriteStream *ts_st;
694
    MpegTSService *service;
695
    AVStream *st;
696
    int i;
697

    
698
    /* flush current packets */
699
    for(i = 0; i < s->nb_streams; i++) {
700
        st = s->streams[i];
701
        ts_st = st->priv_data;
702
        if (ts_st->payload_index > 0) {
703
            mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
704
                             ts_st->payload_pts);
705
        }
706
    }
707
    put_flush_packet(&s->pb);
708
        
709
    for(i = 0; i < ts->nb_services; i++) {
710
        service = ts->services[i];
711
        av_freep(&service->provider_name);
712
        av_freep(&service->name);
713
        av_free(service);
714
    }
715
    av_free(ts->services);
716

    
717
    return 0;
718
}
719

    
720
AVOutputFormat mpegts_mux = {
721
    "mpegts",
722
    "MPEG2 transport stream format",
723
    "video/x-mpegts",
724
    "ts",
725
    sizeof(MpegTSWrite),
726
    CODEC_ID_MP2,
727
    CODEC_ID_MPEG2VIDEO,
728
    mpegts_write_header,
729
    mpegts_write_packet,
730
    mpegts_write_end,
731
};