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ffmpeg / libavformat / sdp.c @ ab0287fc

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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
17
 * 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 "libavutil/parseutils.h"
25
#include "libavcodec/xiph.h"
26
#include "avformat.h"
27
#include "internal.h"
28
#include "avc.h"
29
#include "rtp.h"
30
#if CONFIG_NETWORK
31
#include "network.h"
32
#endif
33

    
34
#if CONFIG_RTP_MUXER
35
#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)
36

    
37
struct sdp_session_level {
38
    int sdp_version;      /**< protocol version (currently 0) */
39
    int id;               /**< session ID */
40
    int version;          /**< session version */
41
    int start_time;       /**< session start time (NTP time, in seconds),
42
                               or 0 in case of permanent session */
43
    int end_time;         /**< session end time (NTP time, in seconds),
44
                               or 0 if the session is not bounded */
45
    int ttl;              /**< TTL, in case of multicast stream */
46
    const char *user;     /**< username of the session's creator */
47
    const char *src_addr; /**< IP address of the machine from which the session was created */
48
    const char *src_type; /**< address type of src_addr */
49
    const char *dst_addr; /**< destination IP address (can be multicast) */
50
    const char *dst_type; /**< destination IP address type */
51
    const char *name;     /**< session name (can be an empty string) */
52
};
53

    
54
static void sdp_write_address(char *buff, int size, const char *dest_addr,
55
                              const char *dest_type, int ttl)
56
{
57
    if (dest_addr) {
58
        if (!dest_type)
59
            dest_type = "IP4";
60
        if (ttl > 0 && !strcmp(dest_type, "IP4")) {
61
            /* The TTL should only be specified for IPv4 multicast addresses,
62
             * not for IPv6. */
63
            av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl);
64
        } else {
65
            av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr);
66
        }
67
    }
68
}
69

    
70
static void sdp_write_header(char *buff, int size, struct sdp_session_level *s)
71
{
72
    av_strlcatf(buff, size, "v=%d\r\n"
73
                            "o=- %d %d IN %s %s\r\n"
74
                            "s=%s\r\n",
75
                            s->sdp_version,
76
                            s->id, s->version, s->src_type, s->src_addr,
77
                            s->name);
78
    sdp_write_address(buff, size, s->dst_addr, s->dst_type, s->ttl);
79
    av_strlcatf(buff, size, "t=%d %d\r\n"
80
                            "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",
81
                            s->start_time, s->end_time);
82
}
83

    
84
#if CONFIG_NETWORK
85
static int resolve_destination(char *dest_addr, int size, char *type,
86
                               int type_size)
87
{
88
    struct addrinfo hints, *ai;
89
    int is_multicast;
90

    
91
    av_strlcpy(type, "IP4", type_size);
92
    if (!dest_addr[0])
93
        return 0;
94

    
95
    /* Resolve the destination, since it must be written
96
     * as a numeric IP address in the SDP. */
97

    
98
    memset(&hints, 0, sizeof(hints));
99
    if (getaddrinfo(dest_addr, NULL, &hints, &ai))
100
        return 0;
101
    getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size,
102
                NULL, 0, NI_NUMERICHOST);
103
#ifdef AF_INET6
104
    if (ai->ai_family == AF_INET6)
105
        av_strlcpy(type, "IP6", type_size);
106
#endif
107
    is_multicast = ff_is_multicast_address(ai->ai_addr);
108
    freeaddrinfo(ai);
109
    return is_multicast;
110
}
111
#else
112
static int resolve_destination(char *dest_addr, int size, char *type,
113
                               int type_size)
114
{
115
    return 0;
116
}
117
#endif
118

    
119
static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url)
120
{
121
    int port;
122
    const char *p;
123
    char proto[32];
124

    
125
    av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url);
126

    
127
    *ttl = 0;
128

    
129
    if (strcmp(proto, "rtp")) {
130
        /* The url isn't for the actual rtp sessions,
131
         * don't parse out anything else than the destination.
132
         */
133
        return 0;
134
    }
135

    
136
    p = strchr(url, '?');
137
    if (p) {
138
        char buff[64];
139

    
140
        if (av_find_info_tag(buff, sizeof(buff), "ttl", p)) {
141
            *ttl = strtol(buff, NULL, 10);
142
        } else {
143
            *ttl = 5;
144
        }
145
    }
146

    
147
    return port;
148
}
149

    
150
#define MAX_PSET_SIZE 1024
151
static char *extradata2psets(AVCodecContext *c)
152
{
153
    char *psets, *p;
154
    const uint8_t *r;
155
    const char *pset_string = "; sprop-parameter-sets=";
156

    
157
    if (c->extradata_size > MAX_EXTRADATA_SIZE) {
158
        av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
159

    
160
        return NULL;
161
    }
162
    if (c->extradata[0] == 1) {
163
        uint8_t *dummy_p;
164
        int dummy_int;
165
        AVBitStreamFilterContext *bsfc= av_bitstream_filter_init("h264_mp4toannexb");
166

    
167
        if (!bsfc) {
168
            av_log(c, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n");
169

    
170
            return NULL;
171
        }
172
        av_bitstream_filter_filter(bsfc, c, NULL, &dummy_p, &dummy_int, NULL, 0, 0);
173
        av_bitstream_filter_close(bsfc);
174
    }
175

    
176
    psets = av_mallocz(MAX_PSET_SIZE);
177
    if (psets == NULL) {
178
        av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
179
        return NULL;
180
    }
181
    memcpy(psets, pset_string, strlen(pset_string));
182
    p = psets + strlen(pset_string);
183
    r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);
184
    while (r < c->extradata + c->extradata_size) {
185
        const uint8_t *r1;
186
        uint8_t nal_type;
187

    
188
        while (!*(r++));
189
        nal_type = *r & 0x1f;
190
        r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);
191
        if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
192
            r = r1;
193
            continue;
194
        }
195
        if (p != (psets + strlen(pset_string))) {
196
            *p = ',';
197
            p++;
198
        }
199
        if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
200
            av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
201
            av_free(psets);
202

    
203
            return NULL;
204
        }
205
        p += strlen(p);
206
        r = r1;
207
    }
208

    
209
    return psets;
210
}
211

    
212
static char *extradata2config(AVCodecContext *c)
213
{
214
    char *config;
215

    
216
    if (c->extradata_size > MAX_EXTRADATA_SIZE) {
217
        av_log(c, AV_LOG_ERROR, "Too much extradata!\n");
218

    
219
        return NULL;
220
    }
221
    config = av_malloc(10 + c->extradata_size * 2);
222
    if (config == NULL) {
223
        av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
224
        return NULL;
225
    }
226
    memcpy(config, "; config=", 9);
227
    ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0);
228
    config[9 + c->extradata_size * 2] = 0;
229

    
230
    return config;
231
}
232

    
233
static char *xiph_extradata2config(AVCodecContext *c)
234
{
235
    char *config, *encoded_config;
236
    uint8_t *header_start[3];
237
    int headers_len, header_len[3], config_len;
238
    int first_header_size;
239

    
240
    switch (c->codec_id) {
241
    case CODEC_ID_THEORA:
242
        first_header_size = 42;
243
        break;
244
    case CODEC_ID_VORBIS:
245
        first_header_size = 30;
246
        break;
247
    default:
248
        av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n");
249
        return NULL;
250
    }
251

    
252
    if (ff_split_xiph_headers(c->extradata, c->extradata_size,
253
                              first_header_size, header_start,
254
                              header_len) < 0) {
255
        av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n");
256
        return NULL;
257
    }
258

    
259
    headers_len = header_len[0] + header_len[2];
260
    config_len = 4 +          // count
261
                 3 +          // ident
262
                 2 +          // packet size
263
                 1 +          // header count
264
                 2 +          // header size
265
                 headers_len; // and the rest
266

    
267
    config = av_malloc(config_len);
268
    if (!config)
269
        goto xiph_fail;
270

    
271
    encoded_config = av_malloc(AV_BASE64_SIZE(config_len));
272
    if (!encoded_config) {
273
        av_free(config);
274
        goto xiph_fail;
275
    }
276

    
277
    config[0] = config[1] = config[2] = 0;
278
    config[3] = 1;
279
    config[4] = (RTP_XIPH_IDENT >> 16) & 0xff;
280
    config[5] = (RTP_XIPH_IDENT >>  8) & 0xff;
281
    config[6] = (RTP_XIPH_IDENT      ) & 0xff;
282
    config[7] = (headers_len >> 8) & 0xff;
283
    config[8] = headers_len & 0xff;
284
    config[9] = 2;
285
    config[10] = header_len[0];
286
    config[11] = 0; // size of comment header; nonexistent
287
    memcpy(config + 12, header_start[0], header_len[0]);
288
    memcpy(config + 12 + header_len[0], header_start[2], header_len[2]);
289

    
290
    av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len),
291
                     config, config_len);
292
    av_free(config);
293

    
294
    return encoded_config;
295

    
296
xiph_fail:
297
    av_log(c, AV_LOG_ERROR,
298
           "Not enough memory for configuration string\n");
299
    return NULL;
300
}
301

    
302
static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type)
303
{
304
    char *config = NULL;
305

    
306
    switch (c->codec_id) {
307
        case CODEC_ID_H264:
308
            if (c->extradata_size) {
309
                config = extradata2psets(c);
310
            }
311
            av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"
312
                                    "a=fmtp:%d packetization-mode=1%s\r\n",
313
                                     payload_type,
314
                                     payload_type, config ? config : "");
315
            break;
316
        case CODEC_ID_H263:
317
        case CODEC_ID_H263P:
318
            /* a=framesize is required by 3GPP TS 26.234 (PSS). It
319
             * actually specifies the maximum video size, but we only know
320
             * the current size. This is required for playback on Android
321
             * stagefright and on Samsung bada. */
322
            av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n"
323
                                    "a=framesize:%d %d-%d\r\n",
324
                                    payload_type,
325
                                    payload_type, c->width, c->height);
326
            break;
327
        case CODEC_ID_MPEG4:
328
            if (c->extradata_size) {
329
                config = extradata2config(c);
330
            }
331
            av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"
332
                                    "a=fmtp:%d profile-level-id=1%s\r\n",
333
                                     payload_type,
334
                                     payload_type, config ? config : "");
335
            break;
336
        case CODEC_ID_AAC:
337
            if (c->extradata_size) {
338
                config = extradata2config(c);
339
            } else {
340
                /* FIXME: maybe we can forge config information based on the
341
                 *        codec parameters...
342
                 */
343
                av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
344
                return NULL;
345
            }
346
            if (config == NULL) {
347
                return NULL;
348
            }
349
            av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
350
                                    "a=fmtp:%d profile-level-id=1;"
351
                                    "mode=AAC-hbr;sizelength=13;indexlength=3;"
352
                                    "indexdeltalength=3%s\r\n",
353
                                     payload_type, c->sample_rate, c->channels,
354
                                     payload_type, config);
355
            break;
356
        case CODEC_ID_PCM_S16BE:
357
            if (payload_type >= RTP_PT_PRIVATE)
358
                av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",
359
                                         payload_type,
360
                                         c->sample_rate, c->channels);
361
            break;
362
        case CODEC_ID_PCM_MULAW:
363
            if (payload_type >= RTP_PT_PRIVATE)
364
                av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",
365
                                         payload_type,
366
                                         c->sample_rate, c->channels);
367
            break;
368
        case CODEC_ID_PCM_ALAW:
369
            if (payload_type >= RTP_PT_PRIVATE)
370
                av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",
371
                                         payload_type,
372
                                         c->sample_rate, c->channels);
373
            break;
374
        case CODEC_ID_AMR_NB:
375
            av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n"
376
                                    "a=fmtp:%d octet-align=1\r\n",
377
                                     payload_type, c->sample_rate, c->channels,
378
                                     payload_type);
379
            break;
380
        case CODEC_ID_AMR_WB:
381
            av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n"
382
                                    "a=fmtp:%d octet-align=1\r\n",
383
                                     payload_type, c->sample_rate, c->channels,
384
                                     payload_type);
385
            break;
386
        case CODEC_ID_VORBIS:
387
            if (c->extradata_size)
388
                config = xiph_extradata2config(c);
389
            else
390
                av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n");
391
            if (!config)
392
                return NULL;
393

    
394
            av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n"
395
                                    "a=fmtp:%d configuration=%s\r\n",
396
                                    payload_type, c->sample_rate, c->channels,
397
                                    payload_type, config);
398
            break;
399
        case CODEC_ID_THEORA: {
400
            const char *pix_fmt;
401
            if (c->extradata_size)
402
                config = xiph_extradata2config(c);
403
            else
404
                av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n");
405
            if (!config)
406
                return NULL;
407

    
408
            switch (c->pix_fmt) {
409
            case PIX_FMT_YUV420P:
410
                pix_fmt = "YCbCr-4:2:0";
411
                break;
412
            case PIX_FMT_YUV422P:
413
                pix_fmt = "YCbCr-4:2:2";
414
                break;
415
            case PIX_FMT_YUV444P:
416
                pix_fmt = "YCbCr-4:4:4";
417
                break;
418
            default:
419
                av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n");
420
                return NULL;
421
            }
422

    
423
            av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n"
424
                                    "a=fmtp:%d delivery-method=inline; "
425
                                    "width=%d; height=%d; sampling=%s; "
426
                                    "configuration=%s\r\n",
427
                                    payload_type, payload_type,
428
                                    c->width, c->height, pix_fmt, config);
429
            break;
430
        }
431
        case CODEC_ID_VP8:
432
            av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n",
433
                                     payload_type);
434
            break;
435
        case CODEC_ID_ADPCM_G722:
436
            if (payload_type >= RTP_PT_PRIVATE)
437
                av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n",
438
                                         payload_type,
439
                                         8000, c->channels);
440
            break;
441
        default:
442
            /* Nothing special to do here... */
443
            break;
444
    }
445

    
446
    av_free(config);
447

    
448
    return buff;
449
}
450

    
451
void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl)
452
{
453
    const char *type;
454
    int payload_type;
455

    
456
    payload_type = ff_rtp_get_payload_type(c);
457
    if (payload_type < 0) {
458
        payload_type = RTP_PT_PRIVATE + (c->codec_type == AVMEDIA_TYPE_AUDIO);
459
    }
460

    
461
    switch (c->codec_type) {
462
        case AVMEDIA_TYPE_VIDEO   : type = "video"      ; break;
463
        case AVMEDIA_TYPE_AUDIO   : type = "audio"      ; break;
464
        case AVMEDIA_TYPE_SUBTITLE: type = "text"       ; break;
465
        default                 : type = "application"; break;
466
    }
467

    
468
    av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);
469
    sdp_write_address(buff, size, dest_addr, dest_type, ttl);
470
    if (c->bit_rate) {
471
        av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);
472
    }
473

    
474
    sdp_write_media_attributes(buff, size, c, payload_type);
475
}
476

    
477
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
478
{
479
    AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0);
480
    struct sdp_session_level s;
481
    int i, j, port, ttl, is_multicast;
482
    char dst[32], dst_type[5];
483

    
484
    memset(buff, 0, size);
485
    memset(&s, 0, sizeof(struct sdp_session_level));
486
    s.user = "-";
487
    s.src_addr = "127.0.0.1";    /* FIXME: Properly set this */
488
    s.src_type = "IP4";
489
    s.name = title ? title->value : "No Name";
490

    
491
    port = 0;
492
    ttl = 0;
493
    if (n_files == 1) {
494
        port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename);
495
        is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
496
                                           sizeof(dst_type));
497
        if (!is_multicast)
498
            ttl = 0;
499
        if (dst[0]) {
500
            s.dst_addr = dst;
501
            s.dst_type = dst_type;
502
            s.ttl = ttl;
503
            if (!strcmp(dst_type, "IP6")) {
504
                s.src_addr = "::1";
505
                s.src_type = "IP6";
506
            }
507
        }
508
    }
509
    sdp_write_header(buff, size, &s);
510

    
511
    dst[0] = 0;
512
    for (i = 0; i < n_files; i++) {
513
        if (n_files != 1) {
514
            port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename);
515
            is_multicast = resolve_destination(dst, sizeof(dst), dst_type,
516
                                               sizeof(dst_type));
517
            if (!is_multicast)
518
                ttl = 0;
519
        }
520
        for (j = 0; j < ac[i]->nb_streams; j++) {
521
            ff_sdp_write_media(buff, size,
522
                                  ac[i]->streams[j]->codec, dst[0] ? dst : NULL,
523
                                  dst_type, (port > 0) ? port + j * 2 : 0, ttl);
524
            if (port <= 0) {
525
                av_strlcatf(buff, size,
526
                                   "a=control:streamid=%d\r\n", i + j);
527
            }
528
        }
529
    }
530

    
531
    return 0;
532
}
533
#else
534
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
535
{
536
    return AVERROR(ENOSYS);
537
}
538

    
539
void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl)
540
{
541
}
542
#endif