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ffmpeg / libavformat / sdp.c @ 7ad526d2

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1
/*
2
 * copyright (c) 2007 Luca Abeni
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20

    
21
#include <string.h>
22
#include "libavutil/avstring.h"
23
#include "libavutil/base64.h"
24
#include "libavcodec/xiph.h"
25
#include "avformat.h"
26
#include "internal.h"
27
#include "avc.h"
28
#include "rtp.h"
29
#if CONFIG_NETWORK
30
#include "network.h"
31
#endif
32

    
33
#if CONFIG_RTP_MUXER
34
#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
35

    
36
struct sdp_session_level {
37
    int sdp_version;      /**< protocol version (currently 0) */
38
    int id;               /**< session ID */
39
    int version;          /**< session version */
40
    int start_time;       /**< session start time (NTP time, in seconds),
41
                               or 0 in case of permanent session */
42
    int end_time;         /**< session end time (NTP time, in seconds),
43
                               or 0 if the session is not bounded */
44
    int ttl;              /**< TTL, in case of multicast stream */
45
    const char *user;     /**< username of the session's creator */
46
    const char *src_addr; /**< IP address of the machine from which the session was created */
47
    const char *src_type; /**< address type of src_addr */
48
    const char *dst_addr; /**< destination IP address (can be multicast) */
49
    const char *dst_type; /**< destination IP address type */
50
    const char *name;     /**< session name (can be an empty string) */
51
};
52

    
53
static void sdp_write_address(char *buff, int size, const char *dest_addr,
54
                              const char *dest_type, int ttl)
55
{
56
    if (dest_addr) {
57
        if (!dest_type)
58
            dest_type = "IP4";
59
        if (ttl > 0) {
60
            av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl);
61
        } else {
62
            av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr);
63
        }
64
    }
65
}
66

    
67
static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
68
{
69
    av_strlcatf(buff, size, "v=%d\r\n"
70
                            "o=- %d %d IN %s %s\r\n"
71
                            "s=%s\r\n",
72
                            s->sdp_version,
73
                            s->id, s->version, s->src_type, s->src_addr,
74
                            s->name);
75
    sdp_write_address(buff, size, s->dst_addr, s->dst_type, s->ttl);
76
    av_strlcatf(buff, size, "t=%d %d\r\n"
77
                            "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
78
                            s->start_time, s->end_time);
79
}
80

    
81
#if CONFIG_NETWORK
82
static void resolve_destination(char *dest_addr, int size, char *type,
83
                                int type_size)
84
{
85
    struct addrinfo hints, *ai;
86

    
87
    av_strlcpy(type, "IP4", type_size);
88
    if (!dest_addr[0])
89
        return;
90

    
91
    /* Resolve the destination, since it must be written
92
     * as a numeric IP address in the SDP. */
93

    
94
    memset(&hints, 0, sizeof(hints));
95
    if (getaddrinfo(dest_addr, NULL, &hints, &ai))
96
        return;
97
        getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size,
98
                    NULL, 0, NI_NUMERICHOST);
99
        if (ai->ai_family == AF_INET6)
100
            av_strlcpy(type, "IP6", type_size);
101
    freeaddrinfo(ai);
102
}
103
#else
104
static void resolve_destination(char *dest_addr, int size, char *type,
105
                                int type_size)
106
{
107
}
108
#endif
109

    
110
static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
111
{
112
    int port;
113
    const char *p;
114
    char proto[32];
115

    
116
    av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
117

    
118
    *ttl = 0;
119

    
120
    if (strcmp(proto, "rtp")) {
121
        /* The url isn't for the actual rtp sessions,
122
         * don't parse out anything else than the destination.
123
         */
124
        return 0;
125
    }
126

    
127
    p = strchr(url, '?');
128
    if (p) {
129
        char buff[64];
130
        int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);
131

    
132
        if (is_multicast) {
133
            if (find_info_tag(buff, sizeof(buff), "ttl", p)) {
134
                *ttl = strtol(buff, NULL, 10);
135
            } else {
136
                *ttl = 5;
137
            }
138
        }
139
    }
140

    
141
    return port;
142
}
143

    
144
#define MAX_PSET_SIZE 1024
145
static char *extradata2psets(AVCodecContext *c)
146
{
147
    char *psets, *p;
148
    const uint8_t *r;
149
    const char *pset_string = "; sprop-parameter-sets=";
150

    
151
    if (c->extradata_size > MAX_EXTRADATA_SIZE) {
152
        av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
153

    
154
        return NULL;
155
    }
156
    if (c->extradata[0] == 1) {
157
        uint8_t *dummy_p;
158
        int dummy_int;
159
        AVBitStreamFilterContext *bsfc= av_bitstream_filter_init("h264_mp4toannexb");
160

    
161
        if (!bsfc) {
162
            av_log(c, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n");
163

    
164
            return NULL;
165
        }
166
        av_bitstream_filter_filter(bsfc, c, NULL, &dummy_p, &dummy_int, NULL, 0, 0);
167
        av_bitstream_filter_close(bsfc);
168
    }
169

    
170
    psets = av_mallocz(MAX_PSET_SIZE);
171
    if (psets == NULL) {
172
        av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
173
        return NULL;
174
    }
175
    memcpy(psets, pset_string, strlen(pset_string));
176
    p = psets + strlen(pset_string);
177
    r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
178
    while (r < c->extradata + c->extradata_size) {
179
        const uint8_t *r1;
180
        uint8_t nal_type;
181

    
182
        while (!*(r++));
183
        nal_type = *r & 0x1f;
184
        r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
185
        if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
186
            r = r1;
187
            continue;
188
        }
189
        if (p != (psets + strlen(pset_string))) {
190
            *p = ',';
191
            p++;
192
        }
193
        if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
194
            av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
195
            av_free(psets);
196

    
197
            return NULL;
198
        }
199
        p += strlen(p);
200
        r = r1;
201
    }
202

    
203
    return psets;
204
}
205

    
206
static char *extradata2config(AVCodecContext *c)
207
{
208
    char *config;
209

    
210
    if (c->extradata_size > MAX_EXTRADATA_SIZE) {
211
        av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
212

    
213
        return NULL;
214
    }
215
    config = av_malloc(10 + c->extradata_size * 2);
216
    if (config == NULL) {
217
        av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
218
        return NULL;
219
    }
220
    memcpy(config, "; config=", 9);
221
    ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
222
    config[9 + c->extradata_size * 2] = 0;
223

    
224
    return config;
225
}
226

    
227
static char *xiph_extradata2config(AVCodecContext *c)
228
{
229
    char *config, *encoded_config;
230
    uint8_t *header_start[3];
231
    int headers_len, header_len[3], config_len;
232
    int first_header_size;
233

    
234
    switch (c->codec_id) {
235
    case CODEC_ID_THEORA:
236
        first_header_size = 42;
237
        break;
238
    case CODEC_ID_VORBIS:
239
        first_header_size = 30;
240
        break;
241
    default:
242
        av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
243
        return NULL;
244
    }
245

    
246
    if (ff_split_xiph_headers(c->extradata, c->extradata_size,
247
                              first_header_size, header_start,
248
                              header_len) < 0) {
249
        av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n");
250
        return NULL;
251
    }
252

    
253
    headers_len = header_len[0] + header_len[2];
254
    config_len = 4 +          // count
255
                 3 +          // ident
256
                 2 +          // packet size
257
                 1 +          // header count
258
                 2 +          // header size
259
                 headers_len; // and the rest
260

    
261
    config = av_malloc(config_len);
262
    if (!config)
263
        goto xiph_fail;
264

    
265
    encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
266
    if (!encoded_config) {
267
        av_free(config);
268
        goto xiph_fail;
269
    }
270

    
271
    config[0] = config[1] = config[2] = 0;
272
    config[3] = 1;
273
    config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
274
    config[5] = (RTP_XIPH_IDENT >>  8) & 0xff;
275
    config[6] = (RTP_XIPH_IDENT      ) & 0xff;
276
    config[7] = (headers_len >> 8) & 0xff;
277
    config[8] = headers_len & 0xff;
278
    config[9] = 2;
279
    config[10] = header_len[0];
280
    config[11] = 0; // size of comment header; nonexistent
281
    memcpy(config + 12, header_start[0], header_len[0]);
282
    memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
283

    
284
    av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
285
                     config, config_len);
286
    av_free(config);
287

    
288
    return encoded_config;
289

    
290
xiph_fail:
291
    av_log(c, AV_LOG_ERROR,
292
           "Not enough memory for configuration string\n");
293
    return NULL;
294
}
295

    
296
static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
297
{
298
    char *config = NULL;
299

    
300
    switch (c->codec_id) {
301
        case CODEC_ID_H264:
302
            if (c->extradata_size) {
303
                config = extradata2psets(c);
304
            }
305
            av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
306
                                    "a=fmtp:%d packetization-mode=1%s\r\n",
307
                                     payload_type,
308
                                     payload_type, config ? config : "");
309
            break;
310
        case CODEC_ID_H263:
311
        case CODEC_ID_H263P:
312
            av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n", payload_type);
313
            break;
314
        case CODEC_ID_MPEG4:
315
            if (c->extradata_size) {
316
                config = extradata2config(c);
317
            }
318
            av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
319
                                    "a=fmtp:%d profile-level-id=1%s\r\n",
320
                                     payload_type,
321
                                     payload_type, config ? config : "");
322
            break;
323
        case CODEC_ID_AAC:
324
            if (c->extradata_size) {
325
                config = extradata2config(c);
326
            } else {
327
                /* FIXME: maybe we can forge config information based on the
328
                 *        codec parameters...
329
                 */
330
                av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
331
                return NULL;
332
            }
333
            if (config == NULL) {
334
                return NULL;
335
            }
336
            av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
337
                                    "a=fmtp:%d profile-level-id=1;"
338
                                    "mode=AAC-hbr;sizelength=13;indexlength=3;"
339
                                    "indexdeltalength=3%s\r\n",
340
                                     payload_type, c->sample_rate, c->channels,
341
                                     payload_type, config);
342
            break;
343
        case CODEC_ID_PCM_S16BE:
344
            if (payload_type >= RTP_PT_PRIVATE)
345
                av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
346
                                         payload_type,
347
                                         c->sample_rate, c->channels);
348
            break;
349
        case CODEC_ID_PCM_MULAW:
350
            if (payload_type >= RTP_PT_PRIVATE)
351
                av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
352
                                         payload_type,
353
                                         c->sample_rate, c->channels);
354
            break;
355
        case CODEC_ID_PCM_ALAW:
356
            if (payload_type >= RTP_PT_PRIVATE)
357
                av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
358
                                         payload_type,
359
                                         c->sample_rate, c->channels);
360
            break;
361
        case CODEC_ID_AMR_NB:
362
            av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
363
                                    "a=fmtp:%d octet-align=1\r\n",
364
                                     payload_type, c->sample_rate, c->channels,
365
                                     payload_type);
366
            break;
367
        case CODEC_ID_AMR_WB:
368
            av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
369
                                    "a=fmtp:%d octet-align=1\r\n",
370
                                     payload_type, c->sample_rate, c->channels,
371
                                     payload_type);
372
            break;
373
        case CODEC_ID_VORBIS:
374
            if (c->extradata_size)
375
                config = xiph_extradata2config(c);
376
            else
377
                av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n");
378
            if (!config)
379
                return NULL;
380

    
381
            av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
382
                                    "a=fmtp:%d configuration=%s\r\n",
383
                                    payload_type, c->sample_rate, c->channels,
384
                                    payload_type, config);
385
            break;
386
        case CODEC_ID_THEORA: {
387
            const char *pix_fmt;
388
            if (c->extradata_size)
389
                config = xiph_extradata2config(c);
390
            else
391
                av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n");
392
            if (!config)
393
                return NULL;
394

    
395
            switch (c->pix_fmt) {
396
            case PIX_FMT_YUV420P:
397
                pix_fmt = "YCbCr-4:2:0";
398
                break;
399
            case PIX_FMT_YUV422P:
400
                pix_fmt = "YCbCr-4:2:2";
401
                break;
402
            case PIX_FMT_YUV444P:
403
                pix_fmt = "YCbCr-4:4:4";
404
                break;
405
            default:
406
                av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
407
                return NULL;
408
            }
409

    
410
            av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
411
                                    "a=fmtp:%d delivery-method=inline; "
412
                                    "width=%d; height=%d; sampling=%s; "
413
                                    "configuration=%s\r\n",
414
                                    payload_type, payload_type,
415
                                    c->width, c->height, pix_fmt, config);
416
            break;
417
        }
418
        case CODEC_ID_VP8:
419
            av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
420
                                     payload_type);
421
            break;
422
        default:
423
            /* Nothing special to do here... */
424
            break;
425
    }
426

    
427
    av_free(config);
428

    
429
    return buff;
430
}
431

    
432
void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl)
433
{
434
    const char *type;
435
    int payload_type;
436

    
437
    payload_type = ff_rtp_get_payload_type(c);
438
    if (payload_type < 0) {
439
        payload_type = RTP_PT_PRIVATE + (c->codec_type == AVMEDIA_TYPE_AUDIO);
440
    }
441

    
442
    switch (c->codec_type) {
443
        case AVMEDIA_TYPE_VIDEO   : type = "video"      ; break;
444
        case AVMEDIA_TYPE_AUDIO   : type = "audio"      ; break;
445
        case AVMEDIA_TYPE_SUBTITLE: type = "text"       ; break;
446
        default                 : type = "application"; break;
447
    }
448

    
449
    av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
450
    sdp_write_address(buff, size, dest_addr, dest_type, ttl);
451
    if (c->bit_rate) {
452
        av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
453
    }
454

    
455
    sdp_write_media_attributes(buff, size, c, payload_type);
456
}
457

    
458
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
459
{
460
    AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
461
    struct sdp_session_level s;
462
    int i, j, port, ttl;
463
    char dst[32], dst_type[5];
464

    
465
    memset(buff, 0, size);
466
    memset(&s, 0, sizeof(struct sdp_session_level));
467
    s.user = "-";
468
    s.src_addr = "127.0.0.1";    /* FIXME: Properly set this */
469
    s.src_type = "IP4";
470
    s.name = title ? title->value : "No Name";
471

    
472
    port = 0;
473
    ttl = 0;
474
    if (n_files == 1) {
475
        port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
476
        resolve_destination(dst, sizeof(dst), dst_type, sizeof(dst_type));
477
        if (dst[0]) {
478
            s.dst_addr = dst;
479
            s.dst_type = dst_type;
480
            s.ttl = ttl;
481
            if (!strcmp(dst_type, "IP6")) {
482
                s.src_addr = "::1";
483
                s.src_type = "IP6";
484
            }
485
        }
486
    }
487
    sdp_write_header(buff, size, &s);
488

    
489
    dst[0] = 0;
490
    for (i = 0; i < n_files; i++) {
491
        if (n_files != 1) {
492
            port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
493
            resolve_destination(dst, sizeof(dst), dst_type, sizeof(dst_type));
494
        }
495
        for (j = 0; j < ac[i]->nb_streams; j++) {
496
            ff_sdp_write_media(buff, size,
497
                                  ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
498
                                  dst_type, (port > 0) ? port + j * 2 : 0, ttl);
499
            if (port <= 0) {
500
                av_strlcatf(buff, size,
501
                                   "a=control:streamid=%d\r\n", i + j);
502
            }
503
        }
504
    }
505

    
506
    return 0;
507
}
508
#else
509
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
510
{
511
    return AVERROR(ENOSYS);
512
}
513

    
514
void ff_sdp_write_media(char *buff, int size, AVCodecContext *c,
515
                        const char *dest_addr, int port, int ttl)
516
{
517
}
518
#endif