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1
/*
2
 * RTSP/SDP client
3
 * Copyright (c) 2002 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
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 *
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 * 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
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 */
21

    
22
/* needed by inet_aton() */
23
#define _SVID_SOURCE
24

    
25
#include "libavutil/base64.h"
26
#include "libavutil/avstring.h"
27
#include "libavutil/intreadwrite.h"
28
#include "avformat.h"
29

    
30
#include <sys/time.h>
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#if HAVE_SYS_SELECT_H
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#include <sys/select.h>
33
#endif
34
#include <strings.h>
35
#include "network.h"
36
#include "rtsp.h"
37

    
38
#include "rtpdec.h"
39
#include "rdt.h"
40
#include "rtp_asf.h"
41
#include "rtp_vorbis.h"
42

    
43
//#define DEBUG
44
//#define DEBUG_RTP_TCP
45

    
46
#if LIBAVFORMAT_VERSION_INT < (53 << 16)
47
int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
48
#endif
49

    
50
#define SPACE_CHARS " \t\r\n"
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/* we use memchr() instead of strchr() here because strchr() will return
52
 * the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
53
#define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
54
static void skip_spaces(const char **pp)
55
{
56
    const char *p;
57
    p = *pp;
58
    while (redir_isspace(*p))
59
        p++;
60
    *pp = p;
61
}
62

    
63
static void get_word_until_chars(char *buf, int buf_size,
64
                                 const char *sep, const char **pp)
65
{
66
    const char *p;
67
    char *q;
68

    
69
    p = *pp;
70
    skip_spaces(&p);
71
    q = buf;
72
    while (!strchr(sep, *p) && *p != '\0') {
73
        if ((q - buf) < buf_size - 1)
74
            *q++ = *p;
75
        p++;
76
    }
77
    if (buf_size > 0)
78
        *q = '\0';
79
    *pp = p;
80
}
81

    
82
static void get_word_sep(char *buf, int buf_size, const char *sep,
83
                         const char **pp)
84
{
85
    if (**pp == '/') (*pp)++;
86
    get_word_until_chars(buf, buf_size, sep, pp);
87
}
88

    
89
static void get_word(char *buf, int buf_size, const char **pp)
90
{
91
    get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
92
}
93

    
94
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
95
static int sdp_parse_rtpmap(AVFormatContext *s,
96
                            AVCodecContext *codec, RTSPStream *rtsp_st,
97
                            int payload_type, const char *p)
98
{
99
    char buf[256];
100
    int i;
101
    AVCodec *c;
102
    const char *c_name;
103

    
104
    /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
105
     * see if we can handle this kind of payload.
106
     * The space should normally not be there but some Real streams or
107
     * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
108
     * have a trailing space. */
109
    get_word_sep(buf, sizeof(buf), "/ ", &p);
110
    if (payload_type >= RTP_PT_PRIVATE) {
111
        RTPDynamicProtocolHandler *handler;
112
        for (handler = RTPFirstDynamicPayloadHandler;
113
             handler; handler = handler->next) {
114
            if (!strcasecmp(buf, handler->enc_name) &&
115
                codec->codec_type == handler->codec_type) {
116
                codec->codec_id          = handler->codec_id;
117
                rtsp_st->dynamic_handler = handler;
118
                if (handler->open)
119
                    rtsp_st->dynamic_protocol_context = handler->open();
120
                break;
121
            }
122
        }
123
    } else {
124
        /* We are in a standard case
125
         * (from http://www.iana.org/assignments/rtp-parameters). */
126
        /* search into AVRtpPayloadTypes[] */
127
        codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
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    }
129

    
130
    c = avcodec_find_decoder(codec->codec_id);
131
    if (c && c->name)
132
        c_name = c->name;
133
    else
134
        c_name = "(null)";
135

    
136
    get_word_sep(buf, sizeof(buf), "/", &p);
137
    i = atoi(buf);
138
    switch (codec->codec_type) {
139
    case CODEC_TYPE_AUDIO:
140
        av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
141
        codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
142
        codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
143
        if (i > 0) {
144
            codec->sample_rate = i;
145
            get_word_sep(buf, sizeof(buf), "/", &p);
146
            i = atoi(buf);
147
            if (i > 0)
148
                codec->channels = i;
149
            // TODO: there is a bug here; if it is a mono stream, and
150
            // less than 22000Hz, faad upconverts to stereo and twice
151
            // the frequency.  No problem, but the sample rate is being
152
            // set here by the sdp line. Patch on its way. (rdm)
153
        }
154
        av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
155
               codec->sample_rate);
156
        av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
157
               codec->channels);
158
        break;
159
    case CODEC_TYPE_VIDEO:
160
        av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
161
        break;
162
    default:
163
        break;
164
    }
165
    return 0;
166
}
167

    
168
/* return the length and optionally the data */
169
static int hex_to_data(uint8_t *data, const char *p)
170
{
171
    int c, len, v;
172

    
173
    len = 0;
174
    v = 1;
175
    for (;;) {
176
        skip_spaces(&p);
177
        if (*p == '\0')
178
            break;
179
        c = toupper((unsigned char) *p++);
180
        if (c >= '0' && c <= '9')
181
            c = c - '0';
182
        else if (c >= 'A' && c <= 'F')
183
            c = c - 'A' + 10;
184
        else
185
            break;
186
        v = (v << 4) | c;
187
        if (v & 0x100) {
188
            if (data)
189
                data[len] = v;
190
            len++;
191
            v = 1;
192
        }
193
    }
194
    return len;
195
}
196

    
197
static void sdp_parse_fmtp_config(AVCodecContext * codec, void *ctx,
198
                                  char *attr, char *value)
199
{
200
    switch (codec->codec_id) {
201
    case CODEC_ID_MPEG4:
202
    case CODEC_ID_AAC:
203
        if (!strcmp(attr, "config")) {
204
            /* decode the hexa encoded parameter */
205
            int len = hex_to_data(NULL, value);
206
            if (codec->extradata)
207
                av_free(codec->extradata);
208
            codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
209
            if (!codec->extradata)
210
                return;
211
            codec->extradata_size = len;
212
            hex_to_data(codec->extradata, value);
213
        }
214
        break;
215
    case CODEC_ID_VORBIS:
216
        ff_vorbis_parse_fmtp_config(codec, ctx, attr, value);
217
        break;
218
    default:
219
        break;
220
    }
221
    return;
222
}
223

    
224
typedef struct {
225
    const char *str;
226
    uint16_t    type;
227
    uint32_t    offset;
228
} AttrNameMap;
229

    
230
/* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
231
#define ATTR_NAME_TYPE_INT 0
232
#define ATTR_NAME_TYPE_STR 1
233
static const AttrNameMap attr_names[]=
234
{
235
    { "SizeLength",       ATTR_NAME_TYPE_INT,
236
      offsetof(RTPPayloadData, sizelength) },
237
    { "IndexLength",      ATTR_NAME_TYPE_INT,
238
      offsetof(RTPPayloadData, indexlength) },
239
    { "IndexDeltaLength", ATTR_NAME_TYPE_INT,
240
      offsetof(RTPPayloadData, indexdeltalength) },
241
    { "profile-level-id", ATTR_NAME_TYPE_INT,
242
      offsetof(RTPPayloadData, profile_level_id) },
243
    { "StreamType",       ATTR_NAME_TYPE_INT,
244
      offsetof(RTPPayloadData, streamtype) },
245
    { "mode",             ATTR_NAME_TYPE_STR,
246
      offsetof(RTPPayloadData, mode) },
247
    { NULL, -1, -1 },
248
};
249

    
250
/* parse the attribute line from the fmtp a line of an sdp resonse. This
251
 * is broken out as a function because it is used in rtp_h264.c, which is
252
 * forthcoming. */
253
int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
254
                             char *value, int value_size)
255
{
256
    skip_spaces(p);
257
    if (**p) {
258
        get_word_sep(attr, attr_size, "=", p);
259
        if (**p == '=')
260
            (*p)++;
261
        get_word_sep(value, value_size, ";", p);
262
        if (**p == ';')
263
            (*p)++;
264
        return 1;
265
    }
266
    return 0;
267
}
268

    
269
/* parse a SDP line and save stream attributes */
270
static void sdp_parse_fmtp(AVStream *st, const char *p)
271
{
272
    char attr[256];
273
    /* Vorbis setup headers can be up to 12KB and are sent base64
274
     * encoded, giving a 12KB * (4/3) = 16KB FMTP line. */
275
    char value[16384];
276
    int i;
277
    RTSPStream *rtsp_st = st->priv_data;
278
    AVCodecContext *codec = st->codec;
279
    RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
280

    
281
    /* loop on each attribute */
282
    while (rtsp_next_attr_and_value(&p, attr, sizeof(attr),
283
                                    value, sizeof(value))) {
284
        /* grab the codec extra_data from the config parameter of the fmtp
285
         * line */
286
        sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
287
                              attr, value);
288
        /* Looking for a known attribute */
289
        for (i = 0; attr_names[i].str; ++i) {
290
            if (!strcasecmp(attr, attr_names[i].str)) {
291
                if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
292
                    *(int *)((char *)rtp_payload_data +
293
                        attr_names[i].offset) = atoi(value);
294
                } else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
295
                    *(char **)((char *)rtp_payload_data +
296
                        attr_names[i].offset) = av_strdup(value);
297
            }
298
        }
299
    }
300
}
301

    
302
/** Parse a string p in the form of Range:npt=xx-xx, and determine the start
303
 *  and end time.
304
 *  Used for seeking in the rtp stream.
305
 */
306
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
307
{
308
    char buf[256];
309

    
310
    skip_spaces(&p);
311
    if (!av_stristart(p, "npt=", &p))
312
        return;
313

    
314
    *start = AV_NOPTS_VALUE;
315
    *end = AV_NOPTS_VALUE;
316

    
317
    get_word_sep(buf, sizeof(buf), "-", &p);
318
    *start = parse_date(buf, 1);
319
    if (*p == '-') {
320
        p++;
321
        get_word_sep(buf, sizeof(buf), "-", &p);
322
        *end = parse_date(buf, 1);
323
    }
324
//    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
325
//    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
326
}
327

    
328
typedef struct SDPParseState {
329
    /* SDP only */
330
    struct in_addr default_ip;
331
    int            default_ttl;
332
    int            skip_media;  ///< set if an unknown m= line occurs
333
} SDPParseState;
334

    
335
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
336
                           int letter, const char *buf)
337
{
338
    RTSPState *rt = s->priv_data;
339
    char buf1[64], st_type[64];
340
    const char *p;
341
    enum CodecType codec_type;
342
    int payload_type, i;
343
    AVStream *st;
344
    RTSPStream *rtsp_st;
345
    struct in_addr sdp_ip;
346
    int ttl;
347

    
348
    dprintf(s, "sdp: %c='%s'\n", letter, buf);
349

    
350
    p = buf;
351
    if (s1->skip_media && letter != 'm')
352
        return;
353
    switch (letter) {
354
    case 'c':
355
        get_word(buf1, sizeof(buf1), &p);
356
        if (strcmp(buf1, "IN") != 0)
357
            return;
358
        get_word(buf1, sizeof(buf1), &p);
359
        if (strcmp(buf1, "IP4") != 0)
360
            return;
361
        get_word_sep(buf1, sizeof(buf1), "/", &p);
362
        if (inet_aton(buf1, &sdp_ip) == 0)
363
            return;
364
        ttl = 16;
365
        if (*p == '/') {
366
            p++;
367
            get_word_sep(buf1, sizeof(buf1), "/", &p);
368
            ttl = atoi(buf1);
369
        }
370
        if (s->nb_streams == 0) {
371
            s1->default_ip = sdp_ip;
372
            s1->default_ttl = ttl;
373
        } else {
374
            st = s->streams[s->nb_streams - 1];
375
            rtsp_st = st->priv_data;
376
            rtsp_st->sdp_ip = sdp_ip;
377
            rtsp_st->sdp_ttl = ttl;
378
        }
379
        break;
380
    case 's':
381
        av_metadata_set(&s->metadata, "title", p);
382
        break;
383
    case 'i':
384
        if (s->nb_streams == 0) {
385
            av_metadata_set(&s->metadata, "comment", p);
386
            break;
387
        }
388
        break;
389
    case 'm':
390
        /* new stream */
391
        s1->skip_media = 0;
392
        get_word(st_type, sizeof(st_type), &p);
393
        if (!strcmp(st_type, "audio")) {
394
            codec_type = CODEC_TYPE_AUDIO;
395
        } else if (!strcmp(st_type, "video")) {
396
            codec_type = CODEC_TYPE_VIDEO;
397
        } else if (!strcmp(st_type, "application")) {
398
            codec_type = CODEC_TYPE_DATA;
399
        } else {
400
            s1->skip_media = 1;
401
            return;
402
        }
403
        rtsp_st = av_mallocz(sizeof(RTSPStream));
404
        if (!rtsp_st)
405
            return;
406
        rtsp_st->stream_index = -1;
407
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
408

    
409
        rtsp_st->sdp_ip = s1->default_ip;
410
        rtsp_st->sdp_ttl = s1->default_ttl;
411

    
412
        get_word(buf1, sizeof(buf1), &p); /* port */
413
        rtsp_st->sdp_port = atoi(buf1);
414

    
415
        get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
416

    
417
        /* XXX: handle list of formats */
418
        get_word(buf1, sizeof(buf1), &p); /* format list */
419
        rtsp_st->sdp_payload_type = atoi(buf1);
420

    
421
        if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
422
            /* no corresponding stream */
423
        } else {
424
            st = av_new_stream(s, 0);
425
            if (!st)
426
                return;
427
            st->priv_data = rtsp_st;
428
            rtsp_st->stream_index = st->index;
429
            st->codec->codec_type = codec_type;
430
            if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
431
                /* if standard payload type, we can find the codec right now */
432
                ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
433
            }
434
        }
435
        /* put a default control url */
436
        av_strlcpy(rtsp_st->control_url, rt->control_uri,
437
                   sizeof(rtsp_st->control_url));
438
        break;
439
    case 'a':
440
        if (av_strstart(p, "control:", &p)) {
441
            if (s->nb_streams == 0) {
442
                if (!strncmp(p, "rtsp://", 7))
443
                    av_strlcpy(rt->control_uri, p,
444
                               sizeof(rt->control_uri));
445
            } else {
446
            char proto[32];
447
            /* get the control url */
448
            st = s->streams[s->nb_streams - 1];
449
            rtsp_st = st->priv_data;
450

    
451
            /* XXX: may need to add full url resolution */
452
            url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
453
                      NULL, NULL, 0, p);
454
            if (proto[0] == '\0') {
455
                /* relative control URL */
456
                if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
457
                av_strlcat(rtsp_st->control_url, "/",
458
                           sizeof(rtsp_st->control_url));
459
                av_strlcat(rtsp_st->control_url, p,
460
                           sizeof(rtsp_st->control_url));
461
            } else
462
                av_strlcpy(rtsp_st->control_url, p,
463
                           sizeof(rtsp_st->control_url));
464
            }
465
        } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
466
            /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
467
            get_word(buf1, sizeof(buf1), &p);
468
            payload_type = atoi(buf1);
469
            st = s->streams[s->nb_streams - 1];
470
            rtsp_st = st->priv_data;
471
            sdp_parse_rtpmap(s, st->codec, rtsp_st, payload_type, p);
472
        } else if (av_strstart(p, "fmtp:", &p)) {
473
            /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
474
            get_word(buf1, sizeof(buf1), &p);
475
            payload_type = atoi(buf1);
476
            for (i = 0; i < s->nb_streams; i++) {
477
                st      = s->streams[i];
478
                rtsp_st = st->priv_data;
479
                if (rtsp_st->sdp_payload_type == payload_type) {
480
                    if (!(rtsp_st->dynamic_handler &&
481
                          rtsp_st->dynamic_handler->parse_sdp_a_line &&
482
                          rtsp_st->dynamic_handler->parse_sdp_a_line(s,
483
                              i, rtsp_st->dynamic_protocol_context, buf)))
484
                        sdp_parse_fmtp(st, p);
485
                }
486
            }
487
        } else if (av_strstart(p, "framesize:", &p)) {
488
            // let dynamic protocol handlers have a stab at the line.
489
            get_word(buf1, sizeof(buf1), &p);
490
            payload_type = atoi(buf1);
491
            for (i = 0; i < s->nb_streams; i++) {
492
                st      = s->streams[i];
493
                rtsp_st = st->priv_data;
494
                if (rtsp_st->sdp_payload_type == payload_type &&
495
                    rtsp_st->dynamic_handler &&
496
                    rtsp_st->dynamic_handler->parse_sdp_a_line)
497
                    rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
498
                        rtsp_st->dynamic_protocol_context, buf);
499
            }
500
        } else if (av_strstart(p, "range:", &p)) {
501
            int64_t start, end;
502

    
503
            // this is so that seeking on a streamed file can work.
504
            rtsp_parse_range_npt(p, &start, &end);
505
            s->start_time = start;
506
            /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
507
            s->duration   = (end == AV_NOPTS_VALUE) ?
508
                            AV_NOPTS_VALUE : end - start;
509
        } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
510
            if (atoi(p) == 1)
511
                rt->transport = RTSP_TRANSPORT_RDT;
512
        } else {
513
            if (rt->server_type == RTSP_SERVER_WMS)
514
                ff_wms_parse_sdp_a_line(s, p);
515
            if (s->nb_streams > 0) {
516
                if (rt->server_type == RTSP_SERVER_REAL)
517
                    ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
518

    
519
                rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
520
                if (rtsp_st->dynamic_handler &&
521
                    rtsp_st->dynamic_handler->parse_sdp_a_line)
522
                    rtsp_st->dynamic_handler->parse_sdp_a_line(s,
523
                        s->nb_streams - 1,
524
                        rtsp_st->dynamic_protocol_context, buf);
525
            }
526
        }
527
        break;
528
    }
529
}
530

    
531
static int sdp_parse(AVFormatContext *s, const char *content)
532
{
533
    const char *p;
534
    int letter;
535
    /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
536
     * contain long SDP lines containing complete ASF Headers (several
537
     * kB) or arrays of MDPR (RM stream descriptor) headers plus
538
     * "rulebooks" describing their properties. Therefore, the SDP line
539
     * buffer is large.
540
     *
541
     * The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
542
    char buf[16384], *q;
543
    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
544

    
545
    memset(s1, 0, sizeof(SDPParseState));
546
    p = content;
547
    for (;;) {
548
        skip_spaces(&p);
549
        letter = *p;
550
        if (letter == '\0')
551
            break;
552
        p++;
553
        if (*p != '=')
554
            goto next_line;
555
        p++;
556
        /* get the content */
557
        q = buf;
558
        while (*p != '\n' && *p != '\r' && *p != '\0') {
559
            if ((q - buf) < sizeof(buf) - 1)
560
                *q++ = *p;
561
            p++;
562
        }
563
        *q = '\0';
564
        sdp_parse_line(s, s1, letter, buf);
565
    next_line:
566
        while (*p != '\n' && *p != '\0')
567
            p++;
568
        if (*p == '\n')
569
            p++;
570
    }
571
    return 0;
572
}
573

    
574
/* close and free RTSP streams */
575
static void rtsp_close_streams(AVFormatContext *s)
576
{
577
    RTSPState *rt = s->priv_data;
578
    int i;
579
    RTSPStream *rtsp_st;
580

    
581
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
582
        rtsp_st = rt->rtsp_streams[i];
583
        if (rtsp_st) {
584
            if (rtsp_st->transport_priv) {
585
                if (rt->transport == RTSP_TRANSPORT_RDT)
586
                    ff_rdt_parse_close(rtsp_st->transport_priv);
587
                else
588
                    rtp_parse_close(rtsp_st->transport_priv);
589
            }
590
            if (rtsp_st->rtp_handle)
591
                url_close(rtsp_st->rtp_handle);
592
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
593
                rtsp_st->dynamic_handler->close(
594
                    rtsp_st->dynamic_protocol_context);
595
        }
596
    }
597
    av_free(rt->rtsp_streams);
598
    if (rt->asf_ctx) {
599
        av_close_input_stream (rt->asf_ctx);
600
        rt->asf_ctx = NULL;
601
    }
602
    av_freep(&rt->auth_b64);
603
}
604

    
605
static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
606
{
607
    RTSPState *rt = s->priv_data;
608
    AVStream *st = NULL;
609

    
610
    /* open the RTP context */
611
    if (rtsp_st->stream_index >= 0)
612
        st = s->streams[rtsp_st->stream_index];
613
    if (!st)
614
        s->ctx_flags |= AVFMTCTX_NOHEADER;
615

    
616
    if (rt->transport == RTSP_TRANSPORT_RDT)
617
        rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
618
                                            rtsp_st->dynamic_protocol_context,
619
                                            rtsp_st->dynamic_handler);
620
    else
621
        rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
622
                                         rtsp_st->sdp_payload_type,
623
                                         &rtsp_st->rtp_payload_data);
624

    
625
    if (!rtsp_st->transport_priv) {
626
         return AVERROR(ENOMEM);
627
    } else if (rt->transport != RTSP_TRANSPORT_RDT) {
628
        if (rtsp_st->dynamic_handler) {
629
            rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
630
                                           rtsp_st->dynamic_protocol_context,
631
                                           rtsp_st->dynamic_handler);
632
        }
633
    }
634

    
635
    return 0;
636
}
637

    
638
#if CONFIG_RTSP_DEMUXER
639
static int rtsp_probe(AVProbeData *p)
640
{
641
    if (av_strstart(p->filename, "rtsp:", NULL))
642
        return AVPROBE_SCORE_MAX;
643
    return 0;
644
}
645

    
646
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
647
{
648
    const char *p;
649
    int v;
650

    
651
    p = *pp;
652
    skip_spaces(&p);
653
    v = strtol(p, (char **)&p, 10);
654
    if (*p == '-') {
655
        p++;
656
        *min_ptr = v;
657
        v = strtol(p, (char **)&p, 10);
658
        *max_ptr = v;
659
    } else {
660
        *min_ptr = v;
661
        *max_ptr = v;
662
    }
663
    *pp = p;
664
}
665

    
666
/* XXX: only one transport specification is parsed */
667
static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
668
{
669
    char transport_protocol[16];
670
    char profile[16];
671
    char lower_transport[16];
672
    char parameter[16];
673
    RTSPTransportField *th;
674
    char buf[256];
675

    
676
    reply->nb_transports = 0;
677

    
678
    for (;;) {
679
        skip_spaces(&p);
680
        if (*p == '\0')
681
            break;
682

    
683
        th = &reply->transports[reply->nb_transports];
684

    
685
        get_word_sep(transport_protocol, sizeof(transport_protocol),
686
                     "/", &p);
687
        if (!strcasecmp (transport_protocol, "rtp")) {
688
            get_word_sep(profile, sizeof(profile), "/;,", &p);
689
            lower_transport[0] = '\0';
690
            /* rtp/avp/<protocol> */
691
            if (*p == '/') {
692
                get_word_sep(lower_transport, sizeof(lower_transport),
693
                             ";,", &p);
694
            }
695
            th->transport = RTSP_TRANSPORT_RTP;
696
        } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
697
                   !strcasecmp (transport_protocol, "x-real-rdt")) {
698
            /* x-pn-tng/<protocol> */
699
            get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
700
            profile[0] = '\0';
701
            th->transport = RTSP_TRANSPORT_RDT;
702
        }
703
        if (!strcasecmp(lower_transport, "TCP"))
704
            th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
705
        else
706
            th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
707

    
708
        if (*p == ';')
709
            p++;
710
        /* get each parameter */
711
        while (*p != '\0' && *p != ',') {
712
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
713
            if (!strcmp(parameter, "port")) {
714
                if (*p == '=') {
715
                    p++;
716
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
717
                }
718
            } else if (!strcmp(parameter, "client_port")) {
719
                if (*p == '=') {
720
                    p++;
721
                    rtsp_parse_range(&th->client_port_min,
722
                                     &th->client_port_max, &p);
723
                }
724
            } else if (!strcmp(parameter, "server_port")) {
725
                if (*p == '=') {
726
                    p++;
727
                    rtsp_parse_range(&th->server_port_min,
728
                                     &th->server_port_max, &p);
729
                }
730
            } else if (!strcmp(parameter, "interleaved")) {
731
                if (*p == '=') {
732
                    p++;
733
                    rtsp_parse_range(&th->interleaved_min,
734
                                     &th->interleaved_max, &p);
735
                }
736
            } else if (!strcmp(parameter, "multicast")) {
737
                if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
738
                    th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
739
            } else if (!strcmp(parameter, "ttl")) {
740
                if (*p == '=') {
741
                    p++;
742
                    th->ttl = strtol(p, (char **)&p, 10);
743
                }
744
            } else if (!strcmp(parameter, "destination")) {
745
                struct in_addr ipaddr;
746

    
747
                if (*p == '=') {
748
                    p++;
749
                    get_word_sep(buf, sizeof(buf), ";,", &p);
750
                    if (inet_aton(buf, &ipaddr))
751
                        th->destination = ntohl(ipaddr.s_addr);
752
                }
753
            }
754
            while (*p != ';' && *p != '\0' && *p != ',')
755
                p++;
756
            if (*p == ';')
757
                p++;
758
        }
759
        if (*p == ',')
760
            p++;
761

    
762
        reply->nb_transports++;
763
    }
764
}
765

    
766
void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
767
{
768
    const char *p;
769

    
770
    /* NOTE: we do case independent match for broken servers */
771
    p = buf;
772
    if (av_stristart(p, "Session:", &p)) {
773
        int t;
774
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
775
        if (av_stristart(p, ";timeout=", &p) &&
776
            (t = strtol(p, NULL, 10)) > 0) {
777
            reply->timeout = t;
778
        }
779
    } else if (av_stristart(p, "Content-Length:", &p)) {
780
        reply->content_length = strtol(p, NULL, 10);
781
    } else if (av_stristart(p, "Transport:", &p)) {
782
        rtsp_parse_transport(reply, p);
783
    } else if (av_stristart(p, "CSeq:", &p)) {
784
        reply->seq = strtol(p, NULL, 10);
785
    } else if (av_stristart(p, "Range:", &p)) {
786
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
787
    } else if (av_stristart(p, "RealChallenge1:", &p)) {
788
        skip_spaces(&p);
789
        av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
790
    } else if (av_stristart(p, "Server:", &p)) {
791
        skip_spaces(&p);
792
        av_strlcpy(reply->server, p, sizeof(reply->server));
793
    } else if (av_stristart(p, "Notice:", &p) ||
794
               av_stristart(p, "X-Notice:", &p)) {
795
        reply->notice = strtol(p, NULL, 10);
796
    } else if (av_stristart(p, "Location:", &p)) {
797
        skip_spaces(&p);
798
        av_strlcpy(reply->location, p , sizeof(reply->location));
799
    }
800
}
801

    
802
/* skip a RTP/TCP interleaved packet */
803
static void rtsp_skip_packet(AVFormatContext *s)
804
{
805
    RTSPState *rt = s->priv_data;
806
    int ret, len, len1;
807
    uint8_t buf[1024];
808

    
809
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
810
    if (ret != 3)
811
        return;
812
    len = AV_RB16(buf + 1);
813

    
814
    dprintf(s, "skipping RTP packet len=%d\n", len);
815

    
816
    /* skip payload */
817
    while (len > 0) {
818
        len1 = len;
819
        if (len1 > sizeof(buf))
820
            len1 = sizeof(buf);
821
        ret = url_read_complete(rt->rtsp_hd, buf, len1);
822
        if (ret != len1)
823
            return;
824
        len -= len1;
825
    }
826
}
827

    
828
/**
829
 * Read a RTSP message from the server, or prepare to read data
830
 * packets if we're reading data interleaved over the TCP/RTSP
831
 * connection as well.
832
 *
833
 * @param s RTSP demuxer context
834
 * @param reply pointer where the RTSP message header will be stored
835
 * @param content_ptr pointer where the RTSP message body, if any, will
836
 *                    be stored (length is in reply)
837
 * @param return_on_interleaved_data whether the function may return if we
838
 *                   encounter a data marker ('$'), which precedes data
839
 *                   packets over interleaved TCP/RTSP connections. If this
840
 *                   is set, this function will return 1 after encountering
841
 *                   a '$'. If it is not set, the function will skip any
842
 *                   data packets (if they are encountered), until a reply
843
 *                   has been fully parsed. If no more data is available
844
 *                   without parsing a reply, it will return an error.
845
 *
846
 * @returns 1 if a data packets is ready to be received, -1 on error,
847
 *          and 0 on success.
848
 */
849
static int rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
850
                           unsigned char **content_ptr,
851
                           int return_on_interleaved_data)
852
{
853
    RTSPState *rt = s->priv_data;
854
    char buf[4096], buf1[1024], *q;
855
    unsigned char ch;
856
    const char *p;
857
    int ret, content_length, line_count = 0;
858
    unsigned char *content = NULL;
859

    
860
    memset(reply, 0, sizeof(*reply));
861

    
862
    /* parse reply (XXX: use buffers) */
863
    rt->last_reply[0] = '\0';
864
    for (;;) {
865
        q = buf;
866
        for (;;) {
867
            ret = url_read_complete(rt->rtsp_hd, &ch, 1);
868
#ifdef DEBUG_RTP_TCP
869
            dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
870
#endif
871
            if (ret != 1)
872
                return -1;
873
            if (ch == '\n')
874
                break;
875
            if (ch == '$') {
876
                /* XXX: only parse it if first char on line ? */
877
                if (return_on_interleaved_data) {
878
                    return 1;
879
                } else
880
                rtsp_skip_packet(s);
881
            } else if (ch != '\r') {
882
                if ((q - buf) < sizeof(buf) - 1)
883
                    *q++ = ch;
884
            }
885
        }
886
        *q = '\0';
887

    
888
        dprintf(s, "line='%s'\n", buf);
889

    
890
        /* test if last line */
891
        if (buf[0] == '\0')
892
            break;
893
        p = buf;
894
        if (line_count == 0) {
895
            /* get reply code */
896
            get_word(buf1, sizeof(buf1), &p);
897
            get_word(buf1, sizeof(buf1), &p);
898
            reply->status_code = atoi(buf1);
899
        } else {
900
            rtsp_parse_line(reply, p);
901
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
902
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
903
        }
904
        line_count++;
905
    }
906

    
907
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
908
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
909

    
910
    content_length = reply->content_length;
911
    if (content_length > 0) {
912
        /* leave some room for a trailing '\0' (useful for simple parsing) */
913
        content = av_malloc(content_length + 1);
914
        (void)url_read_complete(rt->rtsp_hd, content, content_length);
915
        content[content_length] = '\0';
916
    }
917
    if (content_ptr)
918
        *content_ptr = content;
919
    else
920
        av_free(content);
921

    
922
    /* EOS */
923
    if (reply->notice == 2101 /* End-of-Stream Reached */      ||
924
        reply->notice == 2104 /* Start-of-Stream Reached */    ||
925
        reply->notice == 2306 /* Continuous Feed Terminated */) {
926
        rt->state = RTSP_STATE_IDLE;
927
    } else if (reply->notice >= 4400 && reply->notice < 5500) {
928
        return AVERROR(EIO); /* data or server error */
929
    } else if (reply->notice == 2401 /* Ticket Expired */ ||
930
             (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
931
        return AVERROR(EPERM);
932

    
933
    return 0;
934
}
935

    
936
static void rtsp_send_cmd_with_content_async(AVFormatContext *s,
937
                                             const char *cmd,
938
                                             const unsigned char *send_content,
939
                                             int send_content_length)
940
{
941
    RTSPState *rt = s->priv_data;
942
    char buf[4096], buf1[1024];
943

    
944
    rt->seq++;
945
    av_strlcpy(buf, cmd, sizeof(buf));
946
    snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
947
    av_strlcat(buf, buf1, sizeof(buf));
948
    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
949
        snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
950
        av_strlcat(buf, buf1, sizeof(buf));
951
    }
952
    if (rt->auth_b64)
953
        av_strlcatf(buf, sizeof(buf),
954
                    "Authorization: Basic %s\r\n",
955
                    rt->auth_b64);
956
    if (send_content_length > 0 && send_content)
957
        av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
958
    av_strlcat(buf, "\r\n", sizeof(buf));
959

    
960
    dprintf(s, "Sending:\n%s--\n", buf);
961

    
962
    url_write(rt->rtsp_hd, buf, strlen(buf));
963
    if (send_content_length > 0 && send_content)
964
        url_write(rt->rtsp_hd, send_content, send_content_length);
965
    rt->last_cmd_time = av_gettime();
966
}
967

    
968
static void rtsp_send_cmd_async(AVFormatContext *s, const char *cmd)
969
{
970
    rtsp_send_cmd_with_content_async(s, cmd, NULL, 0);
971
}
972

    
973
static void rtsp_send_cmd(AVFormatContext *s,
974
                          const char *cmd, RTSPMessageHeader *reply,
975
                          unsigned char **content_ptr)
976
{
977
    rtsp_send_cmd_async(s, cmd);
978

    
979
    rtsp_read_reply(s, reply, content_ptr, 0);
980
}
981

    
982
static void rtsp_send_cmd_with_content(AVFormatContext *s,
983
                                       const char *cmd,
984
                                       RTSPMessageHeader *reply,
985
                                       unsigned char **content_ptr,
986
                                       const unsigned char *send_content,
987
                                       int send_content_length)
988
{
989
    rtsp_send_cmd_with_content_async(s, cmd, send_content, send_content_length);
990

    
991
    rtsp_read_reply(s, reply, content_ptr, 0);
992
}
993

    
994
/**
995
 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
996
 */
997
static int make_setup_request(AVFormatContext *s, const char *host, int port,
998
                              int lower_transport, const char *real_challenge)
999
{
1000
    RTSPState *rt = s->priv_data;
1001
    int rtx, j, i, err, interleave = 0;
1002
    RTSPStream *rtsp_st;
1003
    RTSPMessageHeader reply1, *reply = &reply1;
1004
    char cmd[2048];
1005
    const char *trans_pref;
1006

    
1007
    if (rt->transport == RTSP_TRANSPORT_RDT)
1008
        trans_pref = "x-pn-tng";
1009
    else
1010
        trans_pref = "RTP/AVP";
1011

    
1012
    /* default timeout: 1 minute */
1013
    rt->timeout = 60;
1014

    
1015
    /* for each stream, make the setup request */
1016
    /* XXX: we assume the same server is used for the control of each
1017
     * RTSP stream */
1018

    
1019
    for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1020
        char transport[2048];
1021

    
1022
        /**
1023
         * WMS serves all UDP data over a single connection, the RTX, which
1024
         * isn't necessarily the first in the SDP but has to be the first
1025
         * to be set up, else the second/third SETUP will fail with a 461.
1026
         */
1027
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1028
             rt->server_type == RTSP_SERVER_WMS) {
1029
            if (i == 0) {
1030
                /* rtx first */
1031
                for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1032
                    int len = strlen(rt->rtsp_streams[rtx]->control_url);
1033
                    if (len >= 4 &&
1034
                        !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1035
                                "/rtx"))
1036
                        break;
1037
                }
1038
                if (rtx == rt->nb_rtsp_streams)
1039
                    return -1; /* no RTX found */
1040
                rtsp_st = rt->rtsp_streams[rtx];
1041
            } else
1042
                rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1043
        } else
1044
            rtsp_st = rt->rtsp_streams[i];
1045

    
1046
        /* RTP/UDP */
1047
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1048
            char buf[256];
1049

    
1050
            if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1051
                port = reply->transports[0].client_port_min;
1052
                goto have_port;
1053
            }
1054

    
1055
            /* first try in specified port range */
1056
            if (RTSP_RTP_PORT_MIN != 0) {
1057
                while (j <= RTSP_RTP_PORT_MAX) {
1058
                    snprintf(buf, sizeof(buf), "rtp://%s?localport=%d",
1059
                             host, j);
1060
                    /* we will use two ports per rtp stream (rtp and rtcp) */
1061
                    j += 2;
1062
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1063
                        goto rtp_opened;
1064
                }
1065
            }
1066

    
1067
#if 0
1068
            /* then try on any port */
1069
            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1070
                err = AVERROR_INVALIDDATA;
1071
                goto fail;
1072
            }
1073
#endif
1074

    
1075
        rtp_opened:
1076
            port = rtp_get_local_port(rtsp_st->rtp_handle);
1077
        have_port:
1078
            snprintf(transport, sizeof(transport) - 1,
1079
                     "%s/UDP;", trans_pref);
1080
            if (rt->server_type != RTSP_SERVER_REAL)
1081
                av_strlcat(transport, "unicast;", sizeof(transport));
1082
            av_strlcatf(transport, sizeof(transport),
1083
                     "client_port=%d", port);
1084
            if (rt->transport == RTSP_TRANSPORT_RTP &&
1085
                !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1086
                av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1087
        }
1088

    
1089
        /* RTP/TCP */
1090
        else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1091
            /** For WMS streams, the application streams are only used for
1092
             * UDP. When trying to set it up for TCP streams, the server
1093
             * will return an error. Therefore, we skip those streams. */
1094
            if (rt->server_type == RTSP_SERVER_WMS &&
1095
                s->streams[rtsp_st->stream_index]->codec->codec_type ==
1096
                    CODEC_TYPE_DATA)
1097
                continue;
1098
            snprintf(transport, sizeof(transport) - 1,
1099
                     "%s/TCP;", trans_pref);
1100
            if (rt->server_type == RTSP_SERVER_WMS)
1101
                av_strlcat(transport, "unicast;", sizeof(transport));
1102
            av_strlcatf(transport, sizeof(transport),
1103
                        "interleaved=%d-%d",
1104
                        interleave, interleave + 1);
1105
            interleave += 2;
1106
        }
1107

    
1108
        else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1109
            snprintf(transport, sizeof(transport) - 1,
1110
                     "%s/UDP;multicast", trans_pref);
1111
        }
1112
        if (s->oformat) {
1113
            av_strlcat(transport, ";mode=receive", sizeof(transport));
1114
        } else if (rt->server_type == RTSP_SERVER_REAL ||
1115
            rt->server_type == RTSP_SERVER_WMS)
1116
            av_strlcat(transport, ";mode=play", sizeof(transport));
1117
        snprintf(cmd, sizeof(cmd),
1118
                 "SETUP %s RTSP/1.0\r\n"
1119
                 "Transport: %s\r\n",
1120
                 rtsp_st->control_url, transport);
1121
        if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1122
            char real_res[41], real_csum[9];
1123
            ff_rdt_calc_response_and_checksum(real_res, real_csum,
1124
                                              real_challenge);
1125
            av_strlcatf(cmd, sizeof(cmd),
1126
                        "If-Match: %s\r\n"
1127
                        "RealChallenge2: %s, sd=%s\r\n",
1128
                        rt->session_id, real_res, real_csum);
1129
        }
1130
        rtsp_send_cmd(s, cmd, reply, NULL);
1131
        if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1132
            err = 1;
1133
            goto fail;
1134
        } else if (reply->status_code != RTSP_STATUS_OK ||
1135
                   reply->nb_transports != 1) {
1136
            err = AVERROR_INVALIDDATA;
1137
            goto fail;
1138
        }
1139

    
1140
        /* XXX: same protocol for all streams is required */
1141
        if (i > 0) {
1142
            if (reply->transports[0].lower_transport != rt->lower_transport ||
1143
                reply->transports[0].transport != rt->transport) {
1144
                err = AVERROR_INVALIDDATA;
1145
                goto fail;
1146
            }
1147
        } else {
1148
            rt->lower_transport = reply->transports[0].lower_transport;
1149
            rt->transport = reply->transports[0].transport;
1150
        }
1151

    
1152
        /* close RTP connection if not choosen */
1153
        if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1154
            (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1155
            url_close(rtsp_st->rtp_handle);
1156
            rtsp_st->rtp_handle = NULL;
1157
        }
1158

    
1159
        switch(reply->transports[0].lower_transport) {
1160
        case RTSP_LOWER_TRANSPORT_TCP:
1161
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1162
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1163
            break;
1164

    
1165
        case RTSP_LOWER_TRANSPORT_UDP: {
1166
            char url[1024];
1167

    
1168
            /* XXX: also use address if specified */
1169
            snprintf(url, sizeof(url), "rtp://%s:%d",
1170
                     host, reply->transports[0].server_port_min);
1171
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1172
                rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1173
                err = AVERROR_INVALIDDATA;
1174
                goto fail;
1175
            }
1176
            /* Try to initialize the connection state in a
1177
             * potential NAT router by sending dummy packets.
1178
             * RTP/RTCP dummy packets are used for RDT, too.
1179
             */
1180
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1181
                rtp_send_punch_packets(rtsp_st->rtp_handle);
1182
            break;
1183
        }
1184
        case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1185
            char url[1024];
1186
            struct in_addr in;
1187
            int port, ttl;
1188

    
1189
            if (reply->transports[0].destination) {
1190
                in.s_addr = htonl(reply->transports[0].destination);
1191
                port      = reply->transports[0].port_min;
1192
                ttl       = reply->transports[0].ttl;
1193
            } else {
1194
                in        = rtsp_st->sdp_ip;
1195
                port      = rtsp_st->sdp_port;
1196
                ttl       = rtsp_st->sdp_ttl;
1197
            }
1198
            snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1199
                     inet_ntoa(in), port, ttl);
1200
            if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1201
                err = AVERROR_INVALIDDATA;
1202
                goto fail;
1203
            }
1204
            break;
1205
        }
1206
        }
1207

    
1208
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1209
            goto fail;
1210
    }
1211

    
1212
    if (reply->timeout > 0)
1213
        rt->timeout = reply->timeout;
1214

    
1215
    if (rt->server_type == RTSP_SERVER_REAL)
1216
        rt->need_subscription = 1;
1217

    
1218
    return 0;
1219

    
1220
fail:
1221
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1222
        if (rt->rtsp_streams[i]->rtp_handle) {
1223
            url_close(rt->rtsp_streams[i]->rtp_handle);
1224
            rt->rtsp_streams[i]->rtp_handle = NULL;
1225
        }
1226
    }
1227
    return err;
1228
}
1229

    
1230
static int rtsp_read_play(AVFormatContext *s)
1231
{
1232
    RTSPState *rt = s->priv_data;
1233
    RTSPMessageHeader reply1, *reply = &reply1;
1234
    char cmd[1024];
1235

    
1236
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1237

    
1238
    if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1239
        if (rt->state == RTSP_STATE_PAUSED) {
1240
            snprintf(cmd, sizeof(cmd),
1241
                     "PLAY %s RTSP/1.0\r\n",
1242
                     rt->control_uri);
1243
        } else {
1244
            snprintf(cmd, sizeof(cmd),
1245
                     "PLAY %s RTSP/1.0\r\n"
1246
                     "Range: npt=%0.3f-\r\n",
1247
                     rt->control_uri,
1248
                     (double)rt->seek_timestamp / AV_TIME_BASE);
1249
        }
1250
        rtsp_send_cmd(s, cmd, reply, NULL);
1251
        if (reply->status_code != RTSP_STATUS_OK) {
1252
            return -1;
1253
        }
1254
    }
1255
    rt->state = RTSP_STATE_STREAMING;
1256
    return 0;
1257
}
1258

    
1259
static int rtsp_read_header(AVFormatContext *s,
1260
                            AVFormatParameters *ap)
1261
{
1262
    RTSPState *rt = s->priv_data;
1263
    char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1264
    char *option_list, *option, *filename;
1265
    URLContext *rtsp_hd;
1266
    int port, ret, err;
1267
    RTSPMessageHeader reply1, *reply = &reply1;
1268
    unsigned char *content = NULL;
1269
    int lower_transport_mask = 0;
1270
    char real_challenge[64];
1271
redirect:
1272
    /* extract hostname and port */
1273
    url_split(NULL, 0, auth, sizeof(auth),
1274
              host, sizeof(host), &port, path, sizeof(path), s->filename);
1275
    if (*auth) {
1276
        int auth_len = strlen(auth), b64_len = ((auth_len + 2) / 3) * 4 + 1;
1277

    
1278
        if (!(rt->auth_b64 = av_malloc(b64_len)))
1279
            return AVERROR(ENOMEM);
1280
        if (!av_base64_encode(rt->auth_b64, b64_len, auth, auth_len)) {
1281
            err = AVERROR(EINVAL);
1282
            goto fail;
1283
        }
1284
    }
1285
    if (port < 0)
1286
        port = RTSP_DEFAULT_PORT;
1287

    
1288
    /* search for options */
1289
    option_list = strchr(path, '?');
1290
    if (option_list) {
1291
        filename = strchr(s->filename, '?');
1292
        while (option_list) {
1293
            /* move the option pointer */
1294
            option = ++option_list;
1295
            option_list = strchr(option_list, '&');
1296
            if (option_list)
1297
                *option_list = 0;
1298

    
1299
            /* handle the options */
1300
            if (!strcmp(option, "udp")) {
1301
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1302
            } else if (!strcmp(option, "multicast")) {
1303
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1304
            } else if (!strcmp(option, "tcp")) {
1305
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1306
            } else {
1307
                strcpy(++filename, option);
1308
                filename += strlen(option);
1309
                if (option_list) *filename = '&';
1310
            }
1311
        }
1312
        *filename = 0;
1313
    }
1314

    
1315
    if (!lower_transport_mask)
1316
        lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1317

    
1318
    /* open the tcp connexion */
1319
    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1320
    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0) {
1321
        err = AVERROR(EIO);
1322
        goto fail;
1323
    }
1324
    rt->rtsp_hd = rtsp_hd;
1325
    rt->seq = 0;
1326

    
1327
    /* request options supported by the server; this also detects server
1328
     * type */
1329
    av_strlcpy(rt->control_uri, s->filename,
1330
               sizeof(rt->control_uri));
1331
    for (rt->server_type = RTSP_SERVER_RTP;;) {
1332
        snprintf(cmd, sizeof(cmd),
1333
                 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1334
        if (rt->server_type == RTSP_SERVER_REAL)
1335
            av_strlcat(cmd,
1336
                       /**
1337
                        * The following entries are required for proper
1338
                        * streaming from a Realmedia server. They are
1339
                        * interdependent in some way although we currently
1340
                        * don't quite understand how. Values were copied
1341
                        * from mplayer SVN r23589.
1342
                        * @param CompanyID is a 16-byte ID in base64
1343
                        * @param ClientChallenge is a 16-byte ID in hex
1344
                        */
1345
                       "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1346
                       "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1347
                       "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1348
                       "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1349
                       sizeof(cmd));
1350
        rtsp_send_cmd(s, cmd, reply, NULL);
1351
        if (reply->status_code != RTSP_STATUS_OK) {
1352
            err = AVERROR_INVALIDDATA;
1353
            goto fail;
1354
        }
1355

    
1356
        /* detect server type if not standard-compliant RTP */
1357
        if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1358
            rt->server_type = RTSP_SERVER_REAL;
1359
            continue;
1360
        } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1361
            rt->server_type = RTSP_SERVER_WMS;
1362
        } else if (rt->server_type == RTSP_SERVER_REAL)
1363
            strcpy(real_challenge, reply->real_challenge);
1364
        break;
1365
    }
1366

    
1367
    /* describe the stream */
1368
    snprintf(cmd, sizeof(cmd),
1369
             "DESCRIBE %s RTSP/1.0\r\n"
1370
             "Accept: application/sdp\r\n",
1371
             s->filename);
1372
    if (rt->server_type == RTSP_SERVER_REAL) {
1373
        /**
1374
         * The Require: attribute is needed for proper streaming from
1375
         * Realmedia servers.
1376
         */
1377
        av_strlcat(cmd,
1378
                   "Require: com.real.retain-entity-for-setup\r\n",
1379
                   sizeof(cmd));
1380
    }
1381
    rtsp_send_cmd(s, cmd, reply, &content);
1382
    if (!content) {
1383
        err = AVERROR_INVALIDDATA;
1384
        goto fail;
1385
    }
1386
    if (reply->status_code != RTSP_STATUS_OK) {
1387
        err = AVERROR_INVALIDDATA;
1388
        goto fail;
1389
    }
1390

    
1391
    /* now we got the SDP description, we parse it */
1392
    ret = sdp_parse(s, (const char *)content);
1393
    av_freep(&content);
1394
    if (ret < 0) {
1395
        err = AVERROR_INVALIDDATA;
1396
        goto fail;
1397
    }
1398

    
1399
    do {
1400
        int lower_transport = ff_log2_tab[lower_transport_mask &
1401
                                  ~(lower_transport_mask - 1)];
1402

    
1403
        err = make_setup_request(s, host, port, lower_transport,
1404
                                 rt->server_type == RTSP_SERVER_REAL ?
1405
                                     real_challenge : NULL);
1406
        if (err < 0)
1407
            goto fail;
1408
        lower_transport_mask &= ~(1 << lower_transport);
1409
        if (lower_transport_mask == 0 && err == 1) {
1410
            err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1411
            goto fail;
1412
        }
1413
    } while (err);
1414

    
1415
    rt->state = RTSP_STATE_IDLE;
1416
    rt->seek_timestamp = 0; /* default is to start stream at position zero */
1417
    if (ap->initial_pause) {
1418
        /* do not start immediately */
1419
    } else {
1420
        if (rtsp_read_play(s) < 0) {
1421
            err = AVERROR_INVALIDDATA;
1422
            goto fail;
1423
        }
1424
    }
1425
    return 0;
1426
 fail:
1427
    rtsp_close_streams(s);
1428
    av_freep(&content);
1429
    url_close(rt->rtsp_hd);
1430
    if (reply->status_code >=300 && reply->status_code < 400) {
1431
        av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1432
        av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1433
               reply->status_code,
1434
               s->filename);
1435
        goto redirect;
1436
    }
1437
    return err;
1438
}
1439

    
1440
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1441
                           uint8_t *buf, int buf_size)
1442
{
1443
    RTSPState *rt = s->priv_data;
1444
    RTSPStream *rtsp_st;
1445
    fd_set rfds;
1446
    int fd, fd_max, n, i, ret, tcp_fd;
1447
    struct timeval tv;
1448

    
1449
    for (;;) {
1450
        if (url_interrupt_cb())
1451
            return AVERROR(EINTR);
1452
        FD_ZERO(&rfds);
1453
        if (rt->rtsp_hd) {
1454
            tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1455
            FD_SET(tcp_fd, &rfds);
1456
        } else {
1457
            fd_max = 0;
1458
            tcp_fd = -1;
1459
        }
1460
        for (i = 0; i < rt->nb_rtsp_streams; i++) {
1461
            rtsp_st = rt->rtsp_streams[i];
1462
            if (rtsp_st->rtp_handle) {
1463
                /* currently, we cannot probe RTCP handle because of
1464
                 * blocking restrictions */
1465
                fd = url_get_file_handle(rtsp_st->rtp_handle);
1466
                if (fd > fd_max)
1467
                    fd_max = fd;
1468
                FD_SET(fd, &rfds);
1469
            }
1470
        }
1471
        tv.tv_sec = 0;
1472
        tv.tv_usec = 100 * 1000;
1473
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1474
        if (n > 0) {
1475
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1476
                rtsp_st = rt->rtsp_streams[i];
1477
                if (rtsp_st->rtp_handle) {
1478
                    fd = url_get_file_handle(rtsp_st->rtp_handle);
1479
                    if (FD_ISSET(fd, &rfds)) {
1480
                        ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1481
                        if (ret > 0) {
1482
                            *prtsp_st = rtsp_st;
1483
                            return ret;
1484
                        }
1485
                    }
1486
                }
1487
            }
1488
#if CONFIG_RTSP_DEMUXER
1489
            if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1490
                RTSPMessageHeader reply;
1491

    
1492
                rtsp_read_reply(s, &reply, NULL, 0);
1493
                /* XXX: parse message */
1494
                if (rt->state != RTSP_STATE_STREAMING)
1495
                    return 0;
1496
            }
1497
#endif
1498
        }
1499
    }
1500
}
1501

    
1502
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1503
                           uint8_t *buf, int buf_size)
1504
{
1505
    RTSPState *rt = s->priv_data;
1506
    int id, len, i, ret;
1507
    RTSPStream *rtsp_st;
1508

    
1509
#ifdef DEBUG_RTP_TCP
1510
    dprintf(s, "tcp_read_packet:\n");
1511
#endif
1512
redo:
1513
    for (;;) {
1514
        RTSPMessageHeader reply;
1515

    
1516
        ret = rtsp_read_reply(s, &reply, NULL, 1);
1517
        if (ret == -1)
1518
            return -1;
1519
        if (ret == 1) /* received '$' */
1520
            break;
1521
        /* XXX: parse message */
1522
        if (rt->state != RTSP_STATE_STREAMING)
1523
            return 0;
1524
    }
1525
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
1526
    if (ret != 3)
1527
        return -1;
1528
    id  = buf[0];
1529
    len = AV_RB16(buf + 1);
1530
#ifdef DEBUG_RTP_TCP
1531
    dprintf(s, "id=%d len=%d\n", id, len);
1532
#endif
1533
    if (len > buf_size || len < 12)
1534
        goto redo;
1535
    /* get the data */
1536
    ret = url_read_complete(rt->rtsp_hd, buf, len);
1537
    if (ret != len)
1538
        return -1;
1539
    if (rt->transport == RTSP_TRANSPORT_RDT &&
1540
        ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1541
        return -1;
1542

    
1543
    /* find the matching stream */
1544
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1545
        rtsp_st = rt->rtsp_streams[i];
1546
        if (id >= rtsp_st->interleaved_min &&
1547
            id <= rtsp_st->interleaved_max)
1548
            goto found;
1549
    }
1550
    goto redo;
1551
found:
1552
    *prtsp_st = rtsp_st;
1553
    return len;
1554
}
1555

    
1556
static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1557
{
1558
    RTSPState *rt = s->priv_data;
1559
    int ret, len;
1560
    uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1561
    RTSPStream *rtsp_st;
1562

    
1563
    /* get next frames from the same RTP packet */
1564
    if (rt->cur_transport_priv) {
1565
        if (rt->transport == RTSP_TRANSPORT_RDT) {
1566
            ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1567
        } else
1568
            ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1569
        if (ret == 0) {
1570
            rt->cur_transport_priv = NULL;
1571
            return 0;
1572
        } else if (ret == 1) {
1573
            return 0;
1574
        } else
1575
            rt->cur_transport_priv = NULL;
1576
    }
1577

    
1578
    /* read next RTP packet */
1579
 redo:
1580
    switch(rt->lower_transport) {
1581
    default:
1582
#if CONFIG_RTSP_DEMUXER
1583
    case RTSP_LOWER_TRANSPORT_TCP:
1584
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1585
        break;
1586
#endif
1587
    case RTSP_LOWER_TRANSPORT_UDP:
1588
    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1589
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1590
        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1591
            rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1592
        break;
1593
    }
1594
    if (len < 0)
1595
        return len;
1596
    if (len == 0)
1597
        return AVERROR_EOF;
1598
    if (rt->transport == RTSP_TRANSPORT_RDT) {
1599
        ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1600
    } else
1601
        ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1602
    if (ret < 0)
1603
        goto redo;
1604
    if (ret == 1)
1605
        /* more packets may follow, so we save the RTP context */
1606
        rt->cur_transport_priv = rtsp_st->transport_priv;
1607

    
1608
    return ret;
1609
}
1610

    
1611
static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1612
{
1613
    RTSPState *rt = s->priv_data;
1614
    int ret;
1615
    RTSPMessageHeader reply1, *reply = &reply1;
1616
    char cmd[1024];
1617

    
1618
    if (rt->server_type == RTSP_SERVER_REAL) {
1619
        int i;
1620
        enum AVDiscard cache[MAX_STREAMS];
1621

    
1622
        for (i = 0; i < s->nb_streams; i++)
1623
            cache[i] = s->streams[i]->discard;
1624

    
1625
        if (!rt->need_subscription) {
1626
            if (memcmp (cache, rt->real_setup_cache,
1627
                        sizeof(enum AVDiscard) * s->nb_streams)) {
1628
                snprintf(cmd, sizeof(cmd),
1629
                         "SET_PARAMETER %s RTSP/1.0\r\n"
1630
                         "Unsubscribe: %s\r\n",
1631
                         rt->control_uri, rt->last_subscription);
1632
                rtsp_send_cmd(s, cmd, reply, NULL);
1633
                if (reply->status_code != RTSP_STATUS_OK)
1634
                    return AVERROR_INVALIDDATA;
1635
                rt->need_subscription = 1;
1636
            }
1637
        }
1638

    
1639
        if (rt->need_subscription) {
1640
            int r, rule_nr, first = 1;
1641

    
1642
            memcpy(rt->real_setup_cache, cache,
1643
                   sizeof(enum AVDiscard) * s->nb_streams);
1644
            rt->last_subscription[0] = 0;
1645

    
1646
            snprintf(cmd, sizeof(cmd),
1647
                     "SET_PARAMETER %s RTSP/1.0\r\n"
1648
                     "Subscribe: ",
1649
                     rt->control_uri);
1650
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1651
                rule_nr = 0;
1652
                for (r = 0; r < s->nb_streams; r++) {
1653
                    if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1654
                        if (s->streams[r]->discard != AVDISCARD_ALL) {
1655
                            if (!first)
1656
                                av_strlcat(rt->last_subscription, ",",
1657
                                           sizeof(rt->last_subscription));
1658
                            ff_rdt_subscribe_rule(
1659
                                rt->last_subscription,
1660
                                sizeof(rt->last_subscription), i, rule_nr);
1661
                            first = 0;
1662
                        }
1663
                        rule_nr++;
1664
                    }
1665
                }
1666
            }
1667
            av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1668
            rtsp_send_cmd(s, cmd, reply, NULL);
1669
            if (reply->status_code != RTSP_STATUS_OK)
1670
                return AVERROR_INVALIDDATA;
1671
            rt->need_subscription = 0;
1672

    
1673
            if (rt->state == RTSP_STATE_STREAMING)
1674
                rtsp_read_play (s);
1675
        }
1676
    }
1677

    
1678
    ret = rtsp_fetch_packet(s, pkt);
1679
    if (ret < 0)
1680
        return ret;
1681

    
1682
    /* send dummy request to keep TCP connection alive */
1683
    if ((rt->server_type == RTSP_SERVER_WMS ||
1684
         rt->server_type == RTSP_SERVER_REAL) &&
1685
        (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1686
        if (rt->server_type == RTSP_SERVER_WMS) {
1687
            snprintf(cmd, sizeof(cmd) - 1,
1688
                     "GET_PARAMETER %s RTSP/1.0\r\n",
1689
                     rt->control_uri);
1690
            rtsp_send_cmd_async(s, cmd);
1691
        } else {
1692
            rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n");
1693
        }
1694
    }
1695

    
1696
    return 0;
1697
}
1698

    
1699
/* pause the stream */
1700
static int rtsp_read_pause(AVFormatContext *s)
1701
{
1702
    RTSPState *rt = s->priv_data;
1703
    RTSPMessageHeader reply1, *reply = &reply1;
1704
    char cmd[1024];
1705

    
1706
    rt = s->priv_data;
1707

    
1708
    if (rt->state != RTSP_STATE_STREAMING)
1709
        return 0;
1710
    else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1711
        snprintf(cmd, sizeof(cmd),
1712
                 "PAUSE %s RTSP/1.0\r\n",
1713
                 rt->control_uri);
1714
        rtsp_send_cmd(s, cmd, reply, NULL);
1715
        if (reply->status_code != RTSP_STATUS_OK) {
1716
            return -1;
1717
        }
1718
    }
1719
    rt->state = RTSP_STATE_PAUSED;
1720
    return 0;
1721
}
1722

    
1723
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1724
                          int64_t timestamp, int flags)
1725
{
1726
    RTSPState *rt = s->priv_data;
1727

    
1728
    rt->seek_timestamp = av_rescale_q(timestamp,
1729
                                      s->streams[stream_index]->time_base,
1730
                                      AV_TIME_BASE_Q);
1731
    switch(rt->state) {
1732
    default:
1733
    case RTSP_STATE_IDLE:
1734
        break;
1735
    case RTSP_STATE_STREAMING:
1736
        if (rtsp_read_pause(s) != 0)
1737
            return -1;
1738
        rt->state = RTSP_STATE_SEEKING;
1739
        if (rtsp_read_play(s) != 0)
1740
            return -1;
1741
        break;
1742
    case RTSP_STATE_PAUSED:
1743
        rt->state = RTSP_STATE_IDLE;
1744
        break;
1745
    }
1746
    return 0;
1747
}
1748

    
1749
static int rtsp_read_close(AVFormatContext *s)
1750
{
1751
    RTSPState *rt = s->priv_data;
1752
    char cmd[1024];
1753

    
1754
#if 0
1755
    /* NOTE: it is valid to flush the buffer here */
1756
    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1757
        url_fclose(&rt->rtsp_gb);
1758
    }
1759
#endif
1760
    snprintf(cmd, sizeof(cmd),
1761
             "TEARDOWN %s RTSP/1.0\r\n",
1762
             s->filename);
1763
    rtsp_send_cmd_async(s, cmd);
1764

    
1765
    rtsp_close_streams(s);
1766
    url_close(rt->rtsp_hd);
1767
    return 0;
1768
}
1769

    
1770
AVInputFormat rtsp_demuxer = {
1771
    "rtsp",
1772
    NULL_IF_CONFIG_SMALL("RTSP input format"),
1773
    sizeof(RTSPState),
1774
    rtsp_probe,
1775
    rtsp_read_header,
1776
    rtsp_read_packet,
1777
    rtsp_read_close,
1778
    rtsp_read_seek,
1779
    .flags = AVFMT_NOFILE,
1780
    .read_play = rtsp_read_play,
1781
    .read_pause = rtsp_read_pause,
1782
};
1783
#endif
1784

    
1785
static int sdp_probe(AVProbeData *p1)
1786
{
1787
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1788

    
1789
    /* we look for a line beginning "c=IN IP4" */
1790
    while (p < p_end && *p != '\0') {
1791
        if (p + sizeof("c=IN IP4") - 1 < p_end &&
1792
            av_strstart(p, "c=IN IP4", NULL))
1793
            return AVPROBE_SCORE_MAX / 2;
1794

    
1795
        while (p < p_end - 1 && *p != '\n') p++;
1796
        if (++p >= p_end)
1797
            break;
1798
        if (*p == '\r')
1799
            p++;
1800
    }
1801
    return 0;
1802
}
1803

    
1804
#define SDP_MAX_SIZE 8192
1805

    
1806
static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
1807
{
1808
    RTSPState *rt = s->priv_data;
1809
    RTSPStream *rtsp_st;
1810
    int size, i, err;
1811
    char *content;
1812
    char url[1024];
1813

    
1814
    /* read the whole sdp file */
1815
    /* XXX: better loading */
1816
    content = av_malloc(SDP_MAX_SIZE);
1817
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1818
    if (size <= 0) {
1819
        av_free(content);
1820
        return AVERROR_INVALIDDATA;
1821
    }
1822
    content[size] ='\0';
1823

    
1824
    sdp_parse(s, content);
1825
    av_free(content);
1826

    
1827
    /* open each RTP stream */
1828
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1829
        rtsp_st = rt->rtsp_streams[i];
1830

    
1831
        snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1832
                 inet_ntoa(rtsp_st->sdp_ip),
1833
                 rtsp_st->sdp_port,
1834
                 rtsp_st->sdp_port,
1835
                 rtsp_st->sdp_ttl);
1836
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1837
            err = AVERROR_INVALIDDATA;
1838
            goto fail;
1839
        }
1840
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1841
            goto fail;
1842
    }
1843
    return 0;
1844
fail:
1845
    rtsp_close_streams(s);
1846
    return err;
1847
}
1848

    
1849
static int sdp_read_close(AVFormatContext *s)
1850
{
1851
    rtsp_close_streams(s);
1852
    return 0;
1853
}
1854

    
1855
AVInputFormat sdp_demuxer = {
1856
    "sdp",
1857
    NULL_IF_CONFIG_SMALL("SDP"),
1858
    sizeof(RTSPState),
1859
    sdp_probe,
1860
    sdp_read_header,
1861
    rtsp_fetch_packet,
1862
    sdp_read_close,
1863
};