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ffmpeg / libavformat / rtsp.c @ d7250724

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1
/*
2
 * RTSP/SDP client
3
 * Copyright (c) 2002 Fabrice Bellard
4
 *
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 * This file is part of FFmpeg.
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 *
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 * 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,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * 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() */
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#define _SVID_SOURCE
24

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

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

    
38
#include "rtpdec.h"
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#include "rdt.h"
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#include "rtp_asf.h"
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#include "rtp_vorbis.h"
42

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

    
46
#if CONFIG_RTSP_DEMUXER
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static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
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                           uint8_t *buf, int buf_size);
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static int rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
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                           unsigned char **content_ptr,
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                           int return_on_interleaved_data);
52
#endif
53

    
54
#if LIBAVFORMAT_VERSION_INT < (53 << 16)
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int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
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#endif
57

    
58
#define SPACE_CHARS " \t\r\n"
59
/* we use memchr() instead of strchr() here because strchr() will return
60
 * the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
61
#define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
62
static void skip_spaces(const char **pp)
63
{
64
    const char *p;
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    p = *pp;
66
    while (redir_isspace(*p))
67
        p++;
68
    *pp = p;
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}
70

    
71
static void get_word_until_chars(char *buf, int buf_size,
72
                                 const char *sep, const char **pp)
73
{
74
    const char *p;
75
    char *q;
76

    
77
    p = *pp;
78
    skip_spaces(&p);
79
    q = buf;
80
    while (!strchr(sep, *p) && *p != '\0') {
81
        if ((q - buf) < buf_size - 1)
82
            *q++ = *p;
83
        p++;
84
    }
85
    if (buf_size > 0)
86
        *q = '\0';
87
    *pp = p;
88
}
89

    
90
static void get_word_sep(char *buf, int buf_size, const char *sep,
91
                         const char **pp)
92
{
93
    if (**pp == '/') (*pp)++;
94
    get_word_until_chars(buf, buf_size, sep, pp);
95
}
96

    
97
static void get_word(char *buf, int buf_size, const char **pp)
98
{
99
    get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
100
}
101

    
102
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
103
   params>] */
104
static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
105
{
106
    char buf[256];
107
    int i;
108
    AVCodec *c;
109
    const char *c_name;
110

    
111
    /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
112
       see if we can handle this kind of payload */
113
    get_word_sep(buf, sizeof(buf), "/", &p);
114
    if (payload_type >= RTP_PT_PRIVATE) {
115
        RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
116
        while(handler) {
117
            if (!strcasecmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
118
                codec->codec_id = handler->codec_id;
119
                rtsp_st->dynamic_handler= handler;
120
                if(handler->open) {
121
                    rtsp_st->dynamic_protocol_context= handler->open();
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                }
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                break;
124
            }
125
            handler= handler->next;
126
        }
127
    } else {
128
        /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
129
        /* search into AVRtpPayloadTypes[] */
130
        codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
131
    }
132

    
133
    c = avcodec_find_decoder(codec->codec_id);
134
    if (c && c->name)
135
        c_name = c->name;
136
    else
137
        c_name = (char *)NULL;
138

    
139
    if (c_name) {
140
        get_word_sep(buf, sizeof(buf), "/", &p);
141
        i = atoi(buf);
142
        switch (codec->codec_type) {
143
            case CODEC_TYPE_AUDIO:
144
                av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
145
                codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
146
                codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
147
                if (i > 0) {
148
                    codec->sample_rate = i;
149
                    get_word_sep(buf, sizeof(buf), "/", &p);
150
                    i = atoi(buf);
151
                    if (i > 0)
152
                        codec->channels = i;
153
                    // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
154
                    //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
155
                }
156
                av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
157
                av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
158
                break;
159
            case CODEC_TYPE_VIDEO:
160
                av_log(codec, 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 -1;
169
}
170

    
171
/* return the length and optionnaly the data */
172
static int hex_to_data(uint8_t *data, const char *p)
173
{
174
    int c, len, v;
175

    
176
    len = 0;
177
    v = 1;
178
    for(;;) {
179
        skip_spaces(&p);
180
        if (*p == '\0')
181
            break;
182
        c = toupper((unsigned char)*p++);
183
        if (c >= '0' && c <= '9')
184
            c = c - '0';
185
        else if (c >= 'A' && c <= 'F')
186
            c = c - 'A' + 10;
187
        else
188
            break;
189
        v = (v << 4) | c;
190
        if (v & 0x100) {
191
            if (data)
192
                data[len] = v;
193
            len++;
194
            v = 1;
195
        }
196
    }
197
    return len;
198
}
199

    
200
static void sdp_parse_fmtp_config(AVCodecContext * codec, void *ctx,
201
                                  char *attr, char *value)
202
{
203
    switch (codec->codec_id) {
204
        case CODEC_ID_MPEG4:
205
        case CODEC_ID_AAC:
206
            if (!strcmp(attr, "config")) {
207
                /* decode the hexa encoded parameter */
208
                int len = hex_to_data(NULL, value);
209
                if (codec->extradata)
210
                    av_free(codec->extradata);
211
                codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
212
                if (!codec->extradata)
213
                    return;
214
                codec->extradata_size = len;
215
                hex_to_data(codec->extradata, value);
216
            }
217
            break;
218
        case CODEC_ID_VORBIS:
219
            ff_vorbis_parse_fmtp_config(codec, ctx, attr, value);
220
            break;
221
        default:
222
            break;
223
    }
224
    return;
225
}
226

    
227
typedef struct {
228
    const char *str;
229
    uint16_t type;
230
    uint32_t offset;
231
} AttrNameMap;
232

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

    
247
/** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
248
* because it is used in rtp_h264.c, which is forthcoming.
249
*/
250
int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
251
{
252
    skip_spaces(p);
253
    if(**p) {
254
        get_word_sep(attr, attr_size, "=", p);
255
        if (**p == '=')
256
            (*p)++;
257
        get_word_sep(value, value_size, ";", p);
258
        if (**p == ';')
259
            (*p)++;
260
        return 1;
261
    }
262
    return 0;
263
}
264

    
265
/* parse a SDP line and save stream attributes */
266
static void sdp_parse_fmtp(AVStream *st, const char *p)
267
{
268
    char attr[256];
269
    /* Vorbis setup headers can be up to 12KB and are sent base64
270
     * encoded, giving a 12KB * (4/3) = 16KB FMTP line. */
271
    char value[16384];
272
    int i;
273

    
274
    RTSPStream *rtsp_st = st->priv_data;
275
    AVCodecContext *codec = st->codec;
276
    RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
277

    
278
    /* loop on each attribute */
279
    while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
280
    {
281
        /* grab the codec extra_data from the config parameter of the fmtp line */
282
        sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
283
                              attr, value);
284
        /* Looking for a known attribute */
285
        for (i = 0; attr_names[i].str; ++i) {
286
            if (!strcasecmp(attr, attr_names[i].str)) {
287
                if (attr_names[i].type == ATTR_NAME_TYPE_INT)
288
                    *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
289
                else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
290
                    *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
291
            }
292
        }
293
    }
294
}
295

    
296
/** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
297
 *  and end time.
298
 *  Used for seeking in the rtp stream.
299
 */
300
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
301
{
302
    char buf[256];
303

    
304
    skip_spaces(&p);
305
    if (!av_stristart(p, "npt=", &p))
306
        return;
307

    
308
    *start = AV_NOPTS_VALUE;
309
    *end = AV_NOPTS_VALUE;
310

    
311
    get_word_sep(buf, sizeof(buf), "-", &p);
312
    *start = parse_date(buf, 1);
313
    if (*p == '-') {
314
        p++;
315
        get_word_sep(buf, sizeof(buf), "-", &p);
316
        *end = parse_date(buf, 1);
317
    }
318
//    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
319
//    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
320
}
321

    
322
typedef struct SDPParseState {
323
    /* SDP only */
324
    struct in_addr default_ip;
325
    int default_ttl;
326
    int skip_media; ///< set if an unknown m= line occurs
327
} SDPParseState;
328

    
329
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
330
                           int letter, const char *buf)
331
{
332
    RTSPState *rt = s->priv_data;
333
    char buf1[64], st_type[64];
334
    const char *p;
335
    enum CodecType codec_type;
336
    int payload_type, i;
337
    AVStream *st;
338
    RTSPStream *rtsp_st;
339
    struct in_addr sdp_ip;
340
    int ttl;
341

    
342
    dprintf(s, "sdp: %c='%s'\n", letter, buf);
343

    
344
    p = buf;
345
    if (s1->skip_media && letter != 'm')
346
        return;
347
    switch(letter) {
348
    case 'c':
349
        get_word(buf1, sizeof(buf1), &p);
350
        if (strcmp(buf1, "IN") != 0)
351
            return;
352
        get_word(buf1, sizeof(buf1), &p);
353
        if (strcmp(buf1, "IP4") != 0)
354
            return;
355
        get_word_sep(buf1, sizeof(buf1), "/", &p);
356
        if (inet_aton(buf1, &sdp_ip) == 0)
357
            return;
358
        ttl = 16;
359
        if (*p == '/') {
360
            p++;
361
            get_word_sep(buf1, sizeof(buf1), "/", &p);
362
            ttl = atoi(buf1);
363
        }
364
        if (s->nb_streams == 0) {
365
            s1->default_ip = sdp_ip;
366
            s1->default_ttl = ttl;
367
        } else {
368
            st = s->streams[s->nb_streams - 1];
369
            rtsp_st = st->priv_data;
370
            rtsp_st->sdp_ip = sdp_ip;
371
            rtsp_st->sdp_ttl = ttl;
372
        }
373
        break;
374
    case 's':
375
        av_metadata_set(&s->metadata, "title", p);
376
        break;
377
    case 'i':
378
        if (s->nb_streams == 0) {
379
            av_metadata_set(&s->metadata, "comment", p);
380
            break;
381
        }
382
        break;
383
    case 'm':
384
        /* new stream */
385
        s1->skip_media = 0;
386
        get_word(st_type, sizeof(st_type), &p);
387
        if (!strcmp(st_type, "audio")) {
388
            codec_type = CODEC_TYPE_AUDIO;
389
        } else if (!strcmp(st_type, "video")) {
390
            codec_type = CODEC_TYPE_VIDEO;
391
        } else if (!strcmp(st_type, "application")) {
392
            codec_type = CODEC_TYPE_DATA;
393
        } else {
394
            s1->skip_media = 1;
395
            return;
396
        }
397
        rtsp_st = av_mallocz(sizeof(RTSPStream));
398
        if (!rtsp_st)
399
            return;
400
        rtsp_st->stream_index = -1;
401
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
402

    
403
        rtsp_st->sdp_ip = s1->default_ip;
404
        rtsp_st->sdp_ttl = s1->default_ttl;
405

    
406
        get_word(buf1, sizeof(buf1), &p); /* port */
407
        rtsp_st->sdp_port = atoi(buf1);
408

    
409
        get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
410

    
411
        /* XXX: handle list of formats */
412
        get_word(buf1, sizeof(buf1), &p); /* format list */
413
        rtsp_st->sdp_payload_type = atoi(buf1);
414

    
415
        if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
416
            /* no corresponding stream */
417
        } else {
418
            st = av_new_stream(s, 0);
419
            if (!st)
420
                return;
421
            st->priv_data = rtsp_st;
422
            rtsp_st->stream_index = st->index;
423
            st->codec->codec_type = codec_type;
424
            if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
425
                /* if standard payload type, we can find the codec right now */
426
                ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
427
            }
428
        }
429
        /* put a default control url */
430
        av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
431
        break;
432
    case 'a':
433
        if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
434
            char proto[32];
435
            /* get the control url */
436
            st = s->streams[s->nb_streams - 1];
437
            rtsp_st = st->priv_data;
438

    
439
            /* XXX: may need to add full url resolution */
440
            url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
441
            if (proto[0] == '\0') {
442
                /* relative control URL */
443
                av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
444
                av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
445
            } else {
446
                av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
447
            }
448
        } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
449
            /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
450
            get_word(buf1, sizeof(buf1), &p);
451
            payload_type = atoi(buf1);
452
            st = s->streams[s->nb_streams - 1];
453
            rtsp_st = st->priv_data;
454
            sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
455
        } else if (av_strstart(p, "fmtp:", &p)) {
456
            /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
457
            get_word(buf1, sizeof(buf1), &p);
458
            payload_type = atoi(buf1);
459
            for(i = 0; i < s->nb_streams;i++) {
460
                st = s->streams[i];
461
                rtsp_st = st->priv_data;
462
                if (rtsp_st->sdp_payload_type == payload_type) {
463
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
464
                        if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
465
                            sdp_parse_fmtp(st, p);
466
                        }
467
                    } else {
468
                        sdp_parse_fmtp(st, p);
469
                    }
470
                }
471
            }
472
        } else if(av_strstart(p, "framesize:", &p)) {
473
            // let dynamic protocol handlers have a stab at the line.
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 && rtsp_st->dynamic_handler->parse_sdp_a_line) {
481
                        rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
482
                    }
483
                }
484
            }
485
        } else if(av_strstart(p, "range:", &p)) {
486
            int64_t start, end;
487

    
488
            // this is so that seeking on a streamed file can work.
489
            rtsp_parse_range_npt(p, &start, &end);
490
            s->start_time= start;
491
            s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
492
        } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
493
            if (atoi(p) == 1)
494
                rt->transport = RTSP_TRANSPORT_RDT;
495
        } else {
496
            if (rt->server_type == RTSP_SERVER_WMS)
497
                ff_wms_parse_sdp_a_line(s, p);
498
            if (s->nb_streams > 0) {
499
                if (rt->server_type == RTSP_SERVER_REAL)
500
                    ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
501

    
502
                rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
503
                if (rtsp_st->dynamic_handler &&
504
                    rtsp_st->dynamic_handler->parse_sdp_a_line)
505
                    rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
506
                        rtsp_st->dynamic_protocol_context, buf);
507
            }
508
        }
509
        break;
510
    }
511
}
512

    
513
static int sdp_parse(AVFormatContext *s, const char *content)
514
{
515
    const char *p;
516
    int letter;
517
    /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
518
     * contain long SDP lines containing complete ASF Headers (several
519
     * kB) or arrays of MDPR (RM stream descriptor) headers plus
520
     * "rulebooks" describing their properties. Therefore, the SDP line
521
     * buffer is large.
522
     *
523
     * The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
524
    char buf[16384], *q;
525
    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
526

    
527
    memset(s1, 0, sizeof(SDPParseState));
528
    p = content;
529
    for(;;) {
530
        skip_spaces(&p);
531
        letter = *p;
532
        if (letter == '\0')
533
            break;
534
        p++;
535
        if (*p != '=')
536
            goto next_line;
537
        p++;
538
        /* get the content */
539
        q = buf;
540
        while (*p != '\n' && *p != '\r' && *p != '\0') {
541
            if ((q - buf) < sizeof(buf) - 1)
542
                *q++ = *p;
543
            p++;
544
        }
545
        *q = '\0';
546
        sdp_parse_line(s, s1, letter, buf);
547
    next_line:
548
        while (*p != '\n' && *p != '\0')
549
            p++;
550
        if (*p == '\n')
551
            p++;
552
    }
553
    return 0;
554
}
555

    
556
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
557
                           uint8_t *buf, int buf_size)
558
{
559
    RTSPState *rt = s->priv_data;
560
    RTSPStream *rtsp_st;
561
    fd_set rfds;
562
    int fd, fd_max, n, i, ret, tcp_fd;
563
    struct timeval tv;
564

    
565
    for(;;) {
566
        if (url_interrupt_cb())
567
            return AVERROR(EINTR);
568
        FD_ZERO(&rfds);
569
        if (rt->rtsp_hd) {
570
            tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
571
            FD_SET(tcp_fd, &rfds);
572
        } else {
573
            fd_max = 0;
574
            tcp_fd = -1;
575
        }
576
        for(i = 0; i < rt->nb_rtsp_streams; i++) {
577
            rtsp_st = rt->rtsp_streams[i];
578
            if (rtsp_st->rtp_handle) {
579
                /* currently, we cannot probe RTCP handle because of
580
                 * blocking restrictions */
581
                fd = url_get_file_handle(rtsp_st->rtp_handle);
582
                if (fd > fd_max)
583
                    fd_max = fd;
584
                FD_SET(fd, &rfds);
585
            }
586
        }
587
        tv.tv_sec = 0;
588
        tv.tv_usec = 100 * 1000;
589
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
590
        if (n > 0) {
591
            for(i = 0; i < rt->nb_rtsp_streams; i++) {
592
                rtsp_st = rt->rtsp_streams[i];
593
                if (rtsp_st->rtp_handle) {
594
                    fd = url_get_file_handle(rtsp_st->rtp_handle);
595
                    if (FD_ISSET(fd, &rfds)) {
596
                        ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
597
                        if (ret > 0) {
598
                            *prtsp_st = rtsp_st;
599
                            return ret;
600
                        }
601
                    }
602
                }
603
            }
604
#if CONFIG_RTSP_DEMUXER
605
            if (FD_ISSET(tcp_fd, &rfds)) {
606
                RTSPMessageHeader reply;
607

    
608
                rtsp_read_reply(s, &reply, NULL, 0);
609
                /* XXX: parse message */
610
                if (rt->state != RTSP_STATE_PLAYING)
611
                    return 0;
612
            }
613
#endif
614
        }
615
    }
616
}
617

    
618
static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
619
{
620
    RTSPState *rt = s->priv_data;
621
    int ret, len;
622
    uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
623
    RTSPStream *rtsp_st;
624

    
625
    /* get next frames from the same RTP packet */
626
    if (rt->cur_transport_priv) {
627
        if (rt->transport == RTSP_TRANSPORT_RDT)
628
            ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
629
        else
630
            ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
631
        if (ret == 0) {
632
            rt->cur_transport_priv = NULL;
633
            return 0;
634
        } else if (ret == 1) {
635
            return 0;
636
        } else {
637
            rt->cur_transport_priv = NULL;
638
        }
639
    }
640

    
641
    /* read next RTP packet */
642
 redo:
643
    switch(rt->lower_transport) {
644
    default:
645
#if CONFIG_RTSP_DEMUXER
646
    case RTSP_LOWER_TRANSPORT_TCP:
647
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
648
        break;
649
#endif
650
    case RTSP_LOWER_TRANSPORT_UDP:
651
    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
652
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
653
        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
654
            rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
655
        break;
656
    }
657
    if (len < 0)
658
        return len;
659
    if (len == 0)
660
        return AVERROR_EOF;
661
    if (rt->transport == RTSP_TRANSPORT_RDT)
662
        ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
663
    else
664
        ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
665
    if (ret < 0)
666
        goto redo;
667
    if (ret == 1) {
668
        /* more packets may follow, so we save the RTP context */
669
        rt->cur_transport_priv = rtsp_st->transport_priv;
670
    }
671

    
672
    return ret;
673
}
674

    
675
/* close and free RTSP streams */
676
static void rtsp_close_streams(RTSPState *rt)
677
{
678
    int i;
679
    RTSPStream *rtsp_st;
680

    
681
    for(i=0;i<rt->nb_rtsp_streams;i++) {
682
        rtsp_st = rt->rtsp_streams[i];
683
        if (rtsp_st) {
684
            if (rtsp_st->transport_priv) {
685
                if (rt->transport == RTSP_TRANSPORT_RDT)
686
                    ff_rdt_parse_close(rtsp_st->transport_priv);
687
                else
688
                    rtp_parse_close(rtsp_st->transport_priv);
689
            }
690
            if (rtsp_st->rtp_handle)
691
                url_close(rtsp_st->rtp_handle);
692
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
693
                rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
694
        }
695
    }
696
    av_free(rt->rtsp_streams);
697
    if (rt->asf_ctx) {
698
        av_close_input_stream (rt->asf_ctx);
699
        rt->asf_ctx = NULL;
700
    }
701
    av_freep(&rt->auth_b64);
702
}
703

    
704
static int
705
rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
706
{
707
    RTSPState *rt = s->priv_data;
708
    AVStream *st = NULL;
709

    
710
    /* open the RTP context */
711
    if (rtsp_st->stream_index >= 0)
712
        st = s->streams[rtsp_st->stream_index];
713
    if (!st)
714
        s->ctx_flags |= AVFMTCTX_NOHEADER;
715

    
716
    if (rt->transport == RTSP_TRANSPORT_RDT)
717
        rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
718
                                            rtsp_st->dynamic_protocol_context,
719
                                            rtsp_st->dynamic_handler);
720
    else
721
        rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
722
                                         rtsp_st->sdp_payload_type,
723
                                         &rtsp_st->rtp_payload_data);
724

    
725
    if (!rtsp_st->transport_priv) {
726
         return AVERROR(ENOMEM);
727
    } else if (rt->transport != RTSP_TRANSPORT_RDT) {
728
        if(rtsp_st->dynamic_handler) {
729
            rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
730
                                           rtsp_st->dynamic_protocol_context,
731
                                           rtsp_st->dynamic_handler);
732
        }
733
    }
734

    
735
    return 0;
736
}
737

    
738
#if CONFIG_RTSP_DEMUXER
739
static int rtsp_probe(AVProbeData *p)
740
{
741
    if (av_strstart(p->filename, "rtsp:", NULL))
742
        return AVPROBE_SCORE_MAX;
743
    return 0;
744
}
745

    
746
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
747
{
748
    const char *p;
749
    int v;
750

    
751
    p = *pp;
752
    skip_spaces(&p);
753
    v = strtol(p, (char **)&p, 10);
754
    if (*p == '-') {
755
        p++;
756
        *min_ptr = v;
757
        v = strtol(p, (char **)&p, 10);
758
        *max_ptr = v;
759
    } else {
760
        *min_ptr = v;
761
        *max_ptr = v;
762
    }
763
    *pp = p;
764
}
765

    
766
/* XXX: only one transport specification is parsed */
767
static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
768
{
769
    char transport_protocol[16];
770
    char profile[16];
771
    char lower_transport[16];
772
    char parameter[16];
773
    RTSPTransportField *th;
774
    char buf[256];
775

    
776
    reply->nb_transports = 0;
777

    
778
    for(;;) {
779
        skip_spaces(&p);
780
        if (*p == '\0')
781
            break;
782

    
783
        th = &reply->transports[reply->nb_transports];
784

    
785
        get_word_sep(transport_protocol, sizeof(transport_protocol),
786
                     "/", &p);
787
        if (!strcasecmp (transport_protocol, "rtp")) {
788
            get_word_sep(profile, sizeof(profile), "/;,", &p);
789
            lower_transport[0] = '\0';
790
            /* rtp/avp/<protocol> */
791
            if (*p == '/') {
792
                get_word_sep(lower_transport, sizeof(lower_transport),
793
                             ";,", &p);
794
            }
795
            th->transport = RTSP_TRANSPORT_RTP;
796
        } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
797
                   !strcasecmp (transport_protocol, "x-real-rdt")) {
798
            /* x-pn-tng/<protocol> */
799
            get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
800
            profile[0] = '\0';
801
            th->transport = RTSP_TRANSPORT_RDT;
802
        }
803
        if (!strcasecmp(lower_transport, "TCP"))
804
            th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
805
        else
806
            th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
807

    
808
        if (*p == ';')
809
            p++;
810
        /* get each parameter */
811
        while (*p != '\0' && *p != ',') {
812
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
813
            if (!strcmp(parameter, "port")) {
814
                if (*p == '=') {
815
                    p++;
816
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
817
                }
818
            } else if (!strcmp(parameter, "client_port")) {
819
                if (*p == '=') {
820
                    p++;
821
                    rtsp_parse_range(&th->client_port_min,
822
                                     &th->client_port_max, &p);
823
                }
824
            } else if (!strcmp(parameter, "server_port")) {
825
                if (*p == '=') {
826
                    p++;
827
                    rtsp_parse_range(&th->server_port_min,
828
                                     &th->server_port_max, &p);
829
                }
830
            } else if (!strcmp(parameter, "interleaved")) {
831
                if (*p == '=') {
832
                    p++;
833
                    rtsp_parse_range(&th->interleaved_min,
834
                                     &th->interleaved_max, &p);
835
                }
836
            } else if (!strcmp(parameter, "multicast")) {
837
                if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
838
                    th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
839
            } else if (!strcmp(parameter, "ttl")) {
840
                if (*p == '=') {
841
                    p++;
842
                    th->ttl = strtol(p, (char **)&p, 10);
843
                }
844
            } else if (!strcmp(parameter, "destination")) {
845
                struct in_addr ipaddr;
846

    
847
                if (*p == '=') {
848
                    p++;
849
                    get_word_sep(buf, sizeof(buf), ";,", &p);
850
                    if (inet_aton(buf, &ipaddr))
851
                        th->destination = ntohl(ipaddr.s_addr);
852
                }
853
            }
854
            while (*p != ';' && *p != '\0' && *p != ',')
855
                p++;
856
            if (*p == ';')
857
                p++;
858
        }
859
        if (*p == ',')
860
            p++;
861

    
862
        reply->nb_transports++;
863
    }
864
}
865

    
866
void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
867
{
868
    const char *p;
869

    
870
    /* NOTE: we do case independent match for broken servers */
871
    p = buf;
872
    if (av_stristart(p, "Session:", &p)) {
873
        int t;
874
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
875
        if (av_stristart(p, ";timeout=", &p) &&
876
            (t = strtol(p, NULL, 10)) > 0) {
877
            reply->timeout = t;
878
        }
879
    } else if (av_stristart(p, "Content-Length:", &p)) {
880
        reply->content_length = strtol(p, NULL, 10);
881
    } else if (av_stristart(p, "Transport:", &p)) {
882
        rtsp_parse_transport(reply, p);
883
    } else if (av_stristart(p, "CSeq:", &p)) {
884
        reply->seq = strtol(p, NULL, 10);
885
    } else if (av_stristart(p, "Range:", &p)) {
886
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
887
    } else if (av_stristart(p, "RealChallenge1:", &p)) {
888
        skip_spaces(&p);
889
        av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
890
    } else if (av_stristart(p, "Server:", &p)) {
891
        skip_spaces(&p);
892
        av_strlcpy(reply->server, p, sizeof(reply->server));
893
    } else if (av_stristart(p, "Notice:", &p) ||
894
               av_stristart(p, "X-Notice:", &p)) {
895
        reply->notice = strtol(p, NULL, 10);
896
    } else if (av_stristart(p, "Location:", &p)) {
897
        skip_spaces(&p);
898
        av_strlcpy(reply->location, p , sizeof(reply->location));
899
    }
900
}
901

    
902
/* skip a RTP/TCP interleaved packet */
903
static void rtsp_skip_packet(AVFormatContext *s)
904
{
905
    RTSPState *rt = s->priv_data;
906
    int ret, len, len1;
907
    uint8_t buf[1024];
908

    
909
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
910
    if (ret != 3)
911
        return;
912
    len = AV_RB16(buf + 1);
913

    
914
    dprintf(s, "skipping RTP packet len=%d\n", len);
915

    
916
    /* skip payload */
917
    while (len > 0) {
918
        len1 = len;
919
        if (len1 > sizeof(buf))
920
            len1 = sizeof(buf);
921
        ret = url_read_complete(rt->rtsp_hd, buf, len1);
922
        if (ret != len1)
923
            return;
924
        len -= len1;
925
    }
926
}
927

    
928
/**
929
 * Read a RTSP message from the server, or prepare to read data
930
 * packets if we're reading data interleaved over the TCP/RTSP
931
 * connection as well.
932
 *
933
 * @param s RTSP demuxer context
934
 * @param reply pointer where the RTSP message header will be stored
935
 * @param content_ptr pointer where the RTSP message body, if any, will
936
 *                    be stored (length is in \p reply)
937
 * @param return_on_interleaved_data whether the function may return if we
938
 *                   encounter a data marker ('$'), which precedes data
939
 *                   packets over interleaved TCP/RTSP connections. If this
940
 *                   is set, this function will return 1 after encountering
941
 *                   a '$'. If it is not set, the function will skip any
942
 *                   data packets (if they are encountered), until a reply
943
 *                   has been fully parsed. If no more data is available
944
 *                   without parsing a reply, it will return an error.
945
 *
946
 * @returns 1 if a data packets is ready to be received, -1 on error,
947
 *          and 0 on success.
948
 */
949
static int
950
rtsp_read_reply (AVFormatContext *s, RTSPMessageHeader *reply,
951
                 unsigned char **content_ptr, int return_on_interleaved_data)
952
{
953
    RTSPState *rt = s->priv_data;
954
    char buf[4096], buf1[1024], *q;
955
    unsigned char ch;
956
    const char *p;
957
    int ret, content_length, line_count = 0;
958
    unsigned char *content = NULL;
959

    
960
    memset(reply, 0, sizeof(*reply));
961

    
962
    /* parse reply (XXX: use buffers) */
963
    rt->last_reply[0] = '\0';
964
    for(;;) {
965
        q = buf;
966
        for(;;) {
967
            ret = url_read_complete(rt->rtsp_hd, &ch, 1);
968
#ifdef DEBUG_RTP_TCP
969
            dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
970
#endif
971
            if (ret != 1)
972
                return -1;
973
            if (ch == '\n')
974
                break;
975
            if (ch == '$') {
976
                /* XXX: only parse it if first char on line ? */
977
                if (return_on_interleaved_data) {
978
                    return 1;
979
                } else
980
                rtsp_skip_packet(s);
981
            } else if (ch != '\r') {
982
                if ((q - buf) < sizeof(buf) - 1)
983
                    *q++ = ch;
984
            }
985
        }
986
        *q = '\0';
987

    
988
        dprintf(s, "line='%s'\n", buf);
989

    
990
        /* test if last line */
991
        if (buf[0] == '\0')
992
            break;
993
        p = buf;
994
        if (line_count == 0) {
995
            /* get reply code */
996
            get_word(buf1, sizeof(buf1), &p);
997
            get_word(buf1, sizeof(buf1), &p);
998
            reply->status_code = atoi(buf1);
999
        } else {
1000
            rtsp_parse_line(reply, p);
1001
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
1002
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
1003
        }
1004
        line_count++;
1005
    }
1006

    
1007
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
1008
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
1009

    
1010
    content_length = reply->content_length;
1011
    if (content_length > 0) {
1012
        /* leave some room for a trailing '\0' (useful for simple parsing) */
1013
        content = av_malloc(content_length + 1);
1014
        (void)url_read_complete(rt->rtsp_hd, content, content_length);
1015
        content[content_length] = '\0';
1016
    }
1017
    if (content_ptr)
1018
        *content_ptr = content;
1019
    else
1020
        av_free(content);
1021

    
1022
    /* EOS */
1023
    if (reply->notice == 2101 /* End-of-Stream Reached */      ||
1024
        reply->notice == 2104 /* Start-of-Stream Reached */    ||
1025
        reply->notice == 2306 /* Continuous Feed Terminated */)
1026
        rt->state = RTSP_STATE_IDLE;
1027
    else if (reply->notice >= 4400 && reply->notice < 5500)
1028
        return AVERROR(EIO); /* data or server error */
1029
    else if (reply->notice == 2401 /* Ticket Expired */ ||
1030
             (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
1031
        return AVERROR(EPERM);
1032

    
1033
    return 0;
1034
}
1035

    
1036
static void rtsp_send_cmd_async (AVFormatContext *s,
1037
                          const char *cmd, RTSPMessageHeader *reply,
1038
                          unsigned char **content_ptr)
1039
{
1040
    RTSPState *rt = s->priv_data;
1041
    char buf[4096], buf1[1024];
1042

    
1043
    rt->seq++;
1044
    av_strlcpy(buf, cmd, sizeof(buf));
1045
    snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
1046
    av_strlcat(buf, buf1, sizeof(buf));
1047
    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
1048
        snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
1049
        av_strlcat(buf, buf1, sizeof(buf));
1050
    }
1051
    if (rt->auth_b64)
1052
        av_strlcatf(buf, sizeof(buf),
1053
                    "Authorization: Basic %s\r\n",
1054
                    rt->auth_b64);
1055
    av_strlcat(buf, "\r\n", sizeof(buf));
1056

    
1057
    dprintf(s, "Sending:\n%s--\n", buf);
1058

    
1059
    url_write(rt->rtsp_hd, buf, strlen(buf));
1060
    rt->last_cmd_time = av_gettime();
1061
}
1062

    
1063
static void rtsp_send_cmd (AVFormatContext *s,
1064
                           const char *cmd, RTSPMessageHeader *reply,
1065
                           unsigned char **content_ptr)
1066
{
1067
    rtsp_send_cmd_async(s, cmd, reply, content_ptr);
1068

    
1069
    rtsp_read_reply(s, reply, content_ptr, 0);
1070
}
1071

    
1072
/**
1073
 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
1074
 */
1075
static int
1076
make_setup_request (AVFormatContext *s, const char *host, int port,
1077
                    int lower_transport, const char *real_challenge)
1078
{
1079
    RTSPState *rt = s->priv_data;
1080
    int rtx, j, i, err, interleave = 0;
1081
    RTSPStream *rtsp_st;
1082
    RTSPMessageHeader reply1, *reply = &reply1;
1083
    char cmd[2048];
1084
    const char *trans_pref;
1085

    
1086
    if (rt->transport == RTSP_TRANSPORT_RDT)
1087
        trans_pref = "x-pn-tng";
1088
    else
1089
        trans_pref = "RTP/AVP";
1090

    
1091
    /* default timeout: 1 minute */
1092
    rt->timeout = 60;
1093

    
1094
    /* for each stream, make the setup request */
1095
    /* XXX: we assume the same server is used for the control of each
1096
       RTSP stream */
1097

    
1098
    for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1099
        char transport[2048];
1100

    
1101
        /**
1102
         * WMS serves all UDP data over a single connection, the RTX, which
1103
         * isn't necessarily the first in the SDP but has to be the first
1104
         * to be set up, else the second/third SETUP will fail with a 461.
1105
         */
1106
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1107
             rt->server_type == RTSP_SERVER_WMS) {
1108
            if (i == 0) {
1109
                /* rtx first */
1110
                for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1111
                    int len = strlen(rt->rtsp_streams[rtx]->control_url);
1112
                    if (len >= 4 &&
1113
                        !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4, "/rtx"))
1114
                        break;
1115
                }
1116
                if (rtx == rt->nb_rtsp_streams)
1117
                    return -1; /* no RTX found */
1118
                rtsp_st = rt->rtsp_streams[rtx];
1119
            } else
1120
                rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1121
        } else
1122
            rtsp_st = rt->rtsp_streams[i];
1123

    
1124
        /* RTP/UDP */
1125
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1126
            char buf[256];
1127

    
1128
            if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1129
                port = reply->transports[0].client_port_min;
1130
                goto have_port;
1131
            }
1132

    
1133
            /* first try in specified port range */
1134
            if (RTSP_RTP_PORT_MIN != 0) {
1135
                while(j <= RTSP_RTP_PORT_MAX) {
1136
                    snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
1137
                    j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
1138
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
1139
                        goto rtp_opened;
1140
                    }
1141
                }
1142
            }
1143

    
1144
/*            then try on any port
1145
**            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1146
**                err = AVERROR_INVALIDDATA;
1147
**                goto fail;
1148
**            }
1149
*/
1150

    
1151
        rtp_opened:
1152
            port = rtp_get_local_port(rtsp_st->rtp_handle);
1153
        have_port:
1154
            snprintf(transport, sizeof(transport) - 1,
1155
                     "%s/UDP;", trans_pref);
1156
            if (rt->server_type != RTSP_SERVER_REAL)
1157
                av_strlcat(transport, "unicast;", sizeof(transport));
1158
            av_strlcatf(transport, sizeof(transport),
1159
                     "client_port=%d", port);
1160
            if (rt->transport == RTSP_TRANSPORT_RTP &&
1161
                !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1162
                av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1163
        }
1164

    
1165
        /* RTP/TCP */
1166
        else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1167
            /** For WMS streams, the application streams are only used for
1168
             * UDP. When trying to set it up for TCP streams, the server
1169
             * will return an error. Therefore, we skip those streams. */
1170
            if (rt->server_type == RTSP_SERVER_WMS &&
1171
                s->streams[rtsp_st->stream_index]->codec->codec_type == CODEC_TYPE_DATA)
1172
                continue;
1173
            snprintf(transport, sizeof(transport) - 1,
1174
                     "%s/TCP;", trans_pref);
1175
            if (rt->server_type == RTSP_SERVER_WMS)
1176
                av_strlcat(transport, "unicast;", sizeof(transport));
1177
            av_strlcatf(transport, sizeof(transport),
1178
                        "interleaved=%d-%d",
1179
                        interleave, interleave + 1);
1180
            interleave += 2;
1181
        }
1182

    
1183
        else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1184
            snprintf(transport, sizeof(transport) - 1,
1185
                     "%s/UDP;multicast", trans_pref);
1186
        }
1187
        if (rt->server_type == RTSP_SERVER_REAL ||
1188
            rt->server_type == RTSP_SERVER_WMS)
1189
            av_strlcat(transport, ";mode=play", sizeof(transport));
1190
        snprintf(cmd, sizeof(cmd),
1191
                 "SETUP %s RTSP/1.0\r\n"
1192
                 "Transport: %s\r\n",
1193
                 rtsp_st->control_url, transport);
1194
        if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1195
            char real_res[41], real_csum[9];
1196
            ff_rdt_calc_response_and_checksum(real_res, real_csum,
1197
                                              real_challenge);
1198
            av_strlcatf(cmd, sizeof(cmd),
1199
                        "If-Match: %s\r\n"
1200
                        "RealChallenge2: %s, sd=%s\r\n",
1201
                        rt->session_id, real_res, real_csum);
1202
        }
1203
        rtsp_send_cmd(s, cmd, reply, NULL);
1204
        if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1205
            err = 1;
1206
            goto fail;
1207
        } else if (reply->status_code != RTSP_STATUS_OK ||
1208
                   reply->nb_transports != 1) {
1209
            err = AVERROR_INVALIDDATA;
1210
            goto fail;
1211
        }
1212

    
1213
        /* XXX: same protocol for all streams is required */
1214
        if (i > 0) {
1215
            if (reply->transports[0].lower_transport != rt->lower_transport ||
1216
                reply->transports[0].transport != rt->transport) {
1217
                err = AVERROR_INVALIDDATA;
1218
                goto fail;
1219
            }
1220
        } else {
1221
            rt->lower_transport = reply->transports[0].lower_transport;
1222
            rt->transport = reply->transports[0].transport;
1223
        }
1224

    
1225
        /* close RTP connection if not choosen */
1226
        if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1227
            (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1228
            url_close(rtsp_st->rtp_handle);
1229
            rtsp_st->rtp_handle = NULL;
1230
        }
1231

    
1232
        switch(reply->transports[0].lower_transport) {
1233
        case RTSP_LOWER_TRANSPORT_TCP:
1234
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1235
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1236
            break;
1237

    
1238
        case RTSP_LOWER_TRANSPORT_UDP:
1239
            {
1240
                char url[1024];
1241

    
1242
                /* XXX: also use address if specified */
1243
                snprintf(url, sizeof(url), "rtp://%s:%d",
1244
                         host, reply->transports[0].server_port_min);
1245
                if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1246
                    rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1247
                    err = AVERROR_INVALIDDATA;
1248
                    goto fail;
1249
                }
1250
            }
1251
            break;
1252
        case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1253
            {
1254
                char url[1024];
1255
                struct in_addr in;
1256
                int port, ttl;
1257

    
1258
                if (reply->transports[0].destination) {
1259
                    in.s_addr = htonl(reply->transports[0].destination);
1260
                    port      = reply->transports[0].port_min;
1261
                    ttl       = reply->transports[0].ttl;
1262
                } else {
1263
                    in        = rtsp_st->sdp_ip;
1264
                    port      = rtsp_st->sdp_port;
1265
                    ttl       = rtsp_st->sdp_ttl;
1266
                }
1267
                snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1268
                         inet_ntoa(in), port, ttl);
1269
                if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1270
                    err = AVERROR_INVALIDDATA;
1271
                    goto fail;
1272
                }
1273
            }
1274
            break;
1275
        }
1276

    
1277
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1278
            goto fail;
1279
    }
1280

    
1281
    if (reply->timeout > 0)
1282
        rt->timeout = reply->timeout;
1283

    
1284
    if (rt->server_type == RTSP_SERVER_REAL)
1285
        rt->need_subscription = 1;
1286

    
1287
    return 0;
1288

    
1289
fail:
1290
    for (i=0; i<rt->nb_rtsp_streams; i++) {
1291
        if (rt->rtsp_streams[i]->rtp_handle) {
1292
            url_close(rt->rtsp_streams[i]->rtp_handle);
1293
            rt->rtsp_streams[i]->rtp_handle = NULL;
1294
        }
1295
    }
1296
    return err;
1297
}
1298

    
1299
static int rtsp_read_play(AVFormatContext *s)
1300
{
1301
    RTSPState *rt = s->priv_data;
1302
    RTSPMessageHeader reply1, *reply = &reply1;
1303
    char cmd[1024];
1304

    
1305
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1306

    
1307
    if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1308
        if (rt->state == RTSP_STATE_PAUSED) {
1309
            snprintf(cmd, sizeof(cmd),
1310
                     "PLAY %s RTSP/1.0\r\n",
1311
                     s->filename);
1312
        } else {
1313
            snprintf(cmd, sizeof(cmd),
1314
                     "PLAY %s RTSP/1.0\r\n"
1315
                     "Range: npt=%0.3f-\r\n",
1316
                     s->filename,
1317
                     (double)rt->seek_timestamp / AV_TIME_BASE);
1318
        }
1319
        rtsp_send_cmd(s, cmd, reply, NULL);
1320
        if (reply->status_code != RTSP_STATUS_OK) {
1321
            return -1;
1322
        }
1323
    }
1324
    rt->state = RTSP_STATE_PLAYING;
1325
    return 0;
1326
}
1327

    
1328
static int rtsp_read_header(AVFormatContext *s,
1329
                            AVFormatParameters *ap)
1330
{
1331
    RTSPState *rt = s->priv_data;
1332
    char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1333
    char *option_list, *option, *filename;
1334
    URLContext *rtsp_hd;
1335
    int port, ret, err;
1336
    RTSPMessageHeader reply1, *reply = &reply1;
1337
    unsigned char *content = NULL;
1338
    int lower_transport_mask = 0;
1339
    char real_challenge[64];
1340
  redirect:
1341
    /* extract hostname and port */
1342
    url_split(NULL, 0, auth, sizeof(auth),
1343
              host, sizeof(host), &port, path, sizeof(path), s->filename);
1344
    if (*auth) {
1345
        int auth_len = strlen(auth), b64_len = ((auth_len + 2) / 3) * 4 + 1;
1346

    
1347
        if (!(rt->auth_b64 = av_malloc(b64_len)))
1348
            return AVERROR(ENOMEM);
1349
        if (!av_base64_encode(rt->auth_b64, b64_len, auth, auth_len)) {
1350
            err = AVERROR(EINVAL);
1351
            goto fail;
1352
        }
1353
    }
1354
    if (port < 0)
1355
        port = RTSP_DEFAULT_PORT;
1356

    
1357
    /* search for options */
1358
    option_list = strchr(path, '?');
1359
    if (option_list) {
1360
        filename = strchr(s->filename, '?');
1361
        while(option_list) {
1362
            /* move the option pointer */
1363
            option = ++option_list;
1364
            option_list = strchr(option_list, '&');
1365
            if (option_list)
1366
                *option_list = 0;
1367

    
1368
            /* handle the options */
1369
            if (strcmp(option, "udp") == 0)
1370
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1371
            else if (strcmp(option, "multicast") == 0)
1372
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1373
            else if (strcmp(option, "tcp") == 0)
1374
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1375
            else {
1376
                strcpy(++filename, option);
1377
                filename += strlen(option);
1378
                if (option_list) *filename = '&';
1379
            }
1380
        }
1381
        *filename = 0;
1382
    }
1383

    
1384
    if (!lower_transport_mask)
1385
        lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1386

    
1387
    /* open the tcp connexion */
1388
    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1389
    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0) {
1390
        err = AVERROR(EIO);
1391
        goto fail;
1392
    }
1393
    rt->rtsp_hd = rtsp_hd;
1394
    rt->seq = 0;
1395

    
1396
    /* request options supported by the server; this also detects server type */
1397
    for (rt->server_type = RTSP_SERVER_RTP;;) {
1398
        snprintf(cmd, sizeof(cmd),
1399
                 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1400
        if (rt->server_type == RTSP_SERVER_REAL)
1401
            av_strlcat(cmd,
1402
                       /**
1403
                        * The following entries are required for proper
1404
                        * streaming from a Realmedia server. They are
1405
                        * interdependent in some way although we currently
1406
                        * don't quite understand how. Values were copied
1407
                        * from mplayer SVN r23589.
1408
                        * @param CompanyID is a 16-byte ID in base64
1409
                        * @param ClientChallenge is a 16-byte ID in hex
1410
                        */
1411
                       "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1412
                       "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1413
                       "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1414
                       "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1415
                       sizeof(cmd));
1416
        rtsp_send_cmd(s, cmd, reply, NULL);
1417
        if (reply->status_code != RTSP_STATUS_OK) {
1418
            err = AVERROR_INVALIDDATA;
1419
            goto fail;
1420
        }
1421

    
1422
        /* detect server type if not standard-compliant RTP */
1423
        if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1424
            rt->server_type = RTSP_SERVER_REAL;
1425
            continue;
1426
        } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1427
            rt->server_type = RTSP_SERVER_WMS;
1428
        } else if (rt->server_type == RTSP_SERVER_REAL) {
1429
            strcpy(real_challenge, reply->real_challenge);
1430
        }
1431
        break;
1432
    }
1433

    
1434
    /* describe the stream */
1435
    snprintf(cmd, sizeof(cmd),
1436
             "DESCRIBE %s RTSP/1.0\r\n"
1437
             "Accept: application/sdp\r\n",
1438
             s->filename);
1439
    if (rt->server_type == RTSP_SERVER_REAL) {
1440
        /**
1441
         * The Require: attribute is needed for proper streaming from
1442
         * Realmedia servers.
1443
         */
1444
        av_strlcat(cmd,
1445
                   "Require: com.real.retain-entity-for-setup\r\n",
1446
                   sizeof(cmd));
1447
    }
1448
    rtsp_send_cmd(s, cmd, reply, &content);
1449
    if (!content) {
1450
        err = AVERROR_INVALIDDATA;
1451
        goto fail;
1452
    }
1453
    if (reply->status_code != RTSP_STATUS_OK) {
1454
        err = AVERROR_INVALIDDATA;
1455
        goto fail;
1456
    }
1457

    
1458
    /* now we got the SDP description, we parse it */
1459
    ret = sdp_parse(s, (const char *)content);
1460
    av_freep(&content);
1461
    if (ret < 0) {
1462
        err = AVERROR_INVALIDDATA;
1463
        goto fail;
1464
    }
1465

    
1466
    do {
1467
        int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1468

    
1469
        err = make_setup_request(s, host, port, lower_transport,
1470
                                 rt->server_type == RTSP_SERVER_REAL ?
1471
                                     real_challenge : NULL);
1472
        if (err < 0)
1473
            goto fail;
1474
        lower_transport_mask &= ~(1 << lower_transport);
1475
        if (lower_transport_mask == 0 && err == 1) {
1476
            err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1477
            goto fail;
1478
        }
1479
    } while (err);
1480

    
1481
    rt->state = RTSP_STATE_IDLE;
1482
    rt->seek_timestamp = 0; /* default is to start stream at position
1483
                               zero */
1484
    if (ap->initial_pause) {
1485
        /* do not start immediately */
1486
    } else {
1487
        if (rtsp_read_play(s) < 0) {
1488
            err = AVERROR_INVALIDDATA;
1489
            goto fail;
1490
        }
1491
    }
1492
    return 0;
1493
 fail:
1494
    rtsp_close_streams(rt);
1495
    av_freep(&content);
1496
    url_close(rt->rtsp_hd);
1497
    if (reply->status_code >=300 && reply->status_code < 400) {
1498
        av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1499
        av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1500
               reply->status_code,
1501
               s->filename);
1502
        goto redirect;
1503
    }
1504
    return err;
1505
}
1506

    
1507
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1508
                           uint8_t *buf, int buf_size)
1509
{
1510
    RTSPState *rt = s->priv_data;
1511
    int id, len, i, ret;
1512
    RTSPStream *rtsp_st;
1513

    
1514
#ifdef DEBUG_RTP_TCP
1515
    dprintf(s, "tcp_read_packet:\n");
1516
#endif
1517
 redo:
1518
    for(;;) {
1519
        RTSPMessageHeader reply;
1520

    
1521
        ret = rtsp_read_reply(s, &reply, NULL, 1);
1522
        if (ret == -1)
1523
            return -1;
1524
        if (ret == 1) /* received '$' */
1525
            break;
1526
        /* XXX: parse message */
1527
        if (rt->state != RTSP_STATE_PLAYING)
1528
            return 0;
1529
    }
1530
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
1531
    if (ret != 3)
1532
        return -1;
1533
    id = buf[0];
1534
    len = AV_RB16(buf + 1);
1535
#ifdef DEBUG_RTP_TCP
1536
    dprintf(s, "id=%d len=%d\n", id, len);
1537
#endif
1538
    if (len > buf_size || len < 12)
1539
        goto redo;
1540
    /* get the data */
1541
    ret = url_read_complete(rt->rtsp_hd, buf, len);
1542
    if (ret != len)
1543
        return -1;
1544
    if (rt->transport == RTSP_TRANSPORT_RDT &&
1545
        ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1546
        return -1;
1547

    
1548
    /* find the matching stream */
1549
    for(i = 0; i < rt->nb_rtsp_streams; i++) {
1550
        rtsp_st = rt->rtsp_streams[i];
1551
        if (id >= rtsp_st->interleaved_min &&
1552
            id <= rtsp_st->interleaved_max)
1553
            goto found;
1554
    }
1555
    goto redo;
1556
 found:
1557
    *prtsp_st = rtsp_st;
1558
    return len;
1559
}
1560

    
1561
static int rtsp_read_packet(AVFormatContext *s,
1562
                            AVPacket *pkt)
1563
{
1564
    RTSPState *rt = s->priv_data;
1565
    int ret;
1566
    RTSPMessageHeader reply1, *reply = &reply1;
1567
    char cmd[1024];
1568

    
1569
    if (rt->server_type == RTSP_SERVER_REAL) {
1570
        int i;
1571
        enum AVDiscard cache[MAX_STREAMS];
1572

    
1573
        for (i = 0; i < s->nb_streams; i++)
1574
            cache[i] = s->streams[i]->discard;
1575

    
1576
        if (!rt->need_subscription) {
1577
            if (memcmp (cache, rt->real_setup_cache,
1578
                        sizeof(enum AVDiscard) * s->nb_streams)) {
1579
                av_strlcatf(cmd, sizeof(cmd),
1580
                            "SET_PARAMETER %s RTSP/1.0\r\n"
1581
                            "Unsubscribe: %s\r\n",
1582
                            s->filename, rt->last_subscription);
1583
                rtsp_send_cmd(s, cmd, reply, NULL);
1584
                if (reply->status_code != RTSP_STATUS_OK)
1585
                    return AVERROR_INVALIDDATA;
1586
                rt->need_subscription = 1;
1587
            }
1588
        }
1589

    
1590
        if (rt->need_subscription) {
1591
            int r, rule_nr, first = 1;
1592

    
1593
            memcpy(rt->real_setup_cache, cache,
1594
                   sizeof(enum AVDiscard) * s->nb_streams);
1595
            rt->last_subscription[0] = 0;
1596

    
1597
            snprintf(cmd, sizeof(cmd),
1598
                     "SET_PARAMETER %s RTSP/1.0\r\n"
1599
                     "Subscribe: ",
1600
                     s->filename);
1601
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1602
                rule_nr = 0;
1603
                for (r = 0; r < s->nb_streams; r++) {
1604
                    if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1605
                        if (s->streams[r]->discard != AVDISCARD_ALL) {
1606
                            if (!first)
1607
                                av_strlcat(rt->last_subscription, ",",
1608
                                           sizeof(rt->last_subscription));
1609
                            ff_rdt_subscribe_rule(
1610
                                rt->last_subscription,
1611
                                sizeof(rt->last_subscription), i, rule_nr);
1612
                            first = 0;
1613
                        }
1614
                        rule_nr++;
1615
                    }
1616
                }
1617
            }
1618
            av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1619
            rtsp_send_cmd(s, cmd, reply, NULL);
1620
            if (reply->status_code != RTSP_STATUS_OK)
1621
                return AVERROR_INVALIDDATA;
1622
            rt->need_subscription = 0;
1623

    
1624
            if (rt->state == RTSP_STATE_PLAYING)
1625
                rtsp_read_play (s);
1626
        }
1627
    }
1628

    
1629
    ret = rtsp_fetch_packet(s, pkt);
1630
    if (ret < 0) {
1631
        return ret;
1632
    }
1633

    
1634
    /* send dummy request to keep TCP connection alive */
1635
    if ((rt->server_type == RTSP_SERVER_WMS ||
1636
         rt->server_type == RTSP_SERVER_REAL) &&
1637
        (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1638
        if (rt->server_type == RTSP_SERVER_WMS) {
1639
            snprintf(cmd, sizeof(cmd) - 1,
1640
                     "GET_PARAMETER %s RTSP/1.0\r\n",
1641
                     s->filename);
1642
            rtsp_send_cmd_async(s, cmd, reply, NULL);
1643
        } else {
1644
            rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n",
1645
                                reply, NULL);
1646
        }
1647
    }
1648

    
1649
    return 0;
1650
}
1651

    
1652
/* pause the stream */
1653
static int rtsp_read_pause(AVFormatContext *s)
1654
{
1655
    RTSPState *rt = s->priv_data;
1656
    RTSPMessageHeader reply1, *reply = &reply1;
1657
    char cmd[1024];
1658

    
1659
    rt = s->priv_data;
1660

    
1661
    if (rt->state != RTSP_STATE_PLAYING)
1662
        return 0;
1663
    else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1664
        snprintf(cmd, sizeof(cmd),
1665
                 "PAUSE %s RTSP/1.0\r\n",
1666
                 s->filename);
1667
        rtsp_send_cmd(s, cmd, reply, NULL);
1668
        if (reply->status_code != RTSP_STATUS_OK) {
1669
            return -1;
1670
        }
1671
    }
1672
    rt->state = RTSP_STATE_PAUSED;
1673
    return 0;
1674
}
1675

    
1676
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1677
                          int64_t timestamp, int flags)
1678
{
1679
    RTSPState *rt = s->priv_data;
1680

    
1681
    rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1682
    switch(rt->state) {
1683
    default:
1684
    case RTSP_STATE_IDLE:
1685
        break;
1686
    case RTSP_STATE_PLAYING:
1687
        if (rtsp_read_pause(s) != 0)
1688
            return -1;
1689
        rt->state = RTSP_STATE_SEEKING;
1690
        if (rtsp_read_play(s) != 0)
1691
            return -1;
1692
        break;
1693
    case RTSP_STATE_PAUSED:
1694
        rt->state = RTSP_STATE_IDLE;
1695
        break;
1696
    }
1697
    return 0;
1698
}
1699

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

    
1706
#if 0
1707
    /* NOTE: it is valid to flush the buffer here */
1708
    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1709
        url_fclose(&rt->rtsp_gb);
1710
    }
1711
#endif
1712
    snprintf(cmd, sizeof(cmd),
1713
             "TEARDOWN %s RTSP/1.0\r\n",
1714
             s->filename);
1715
    rtsp_send_cmd(s, cmd, reply, NULL);
1716

    
1717
    rtsp_close_streams(rt);
1718
    url_close(rt->rtsp_hd);
1719
    return 0;
1720
}
1721

    
1722
AVInputFormat rtsp_demuxer = {
1723
    "rtsp",
1724
    NULL_IF_CONFIG_SMALL("RTSP input format"),
1725
    sizeof(RTSPState),
1726
    rtsp_probe,
1727
    rtsp_read_header,
1728
    rtsp_read_packet,
1729
    rtsp_read_close,
1730
    rtsp_read_seek,
1731
    .flags = AVFMT_NOFILE,
1732
    .read_play = rtsp_read_play,
1733
    .read_pause = rtsp_read_pause,
1734
};
1735
#endif
1736

    
1737
static int sdp_probe(AVProbeData *p1)
1738
{
1739
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1740

    
1741
    /* we look for a line beginning "c=IN IP4" */
1742
    while (p < p_end && *p != '\0') {
1743
        if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1744
            return AVPROBE_SCORE_MAX / 2;
1745

    
1746
        while(p < p_end - 1 && *p != '\n') p++;
1747
        if (++p >= p_end)
1748
            break;
1749
        if (*p == '\r')
1750
            p++;
1751
    }
1752
    return 0;
1753
}
1754

    
1755
#define SDP_MAX_SIZE 8192
1756

    
1757
static int sdp_read_header(AVFormatContext *s,
1758
                           AVFormatParameters *ap)
1759
{
1760
    RTSPState *rt = s->priv_data;
1761
    RTSPStream *rtsp_st;
1762
    int size, i, err;
1763
    char *content;
1764
    char url[1024];
1765

    
1766
    /* read the whole sdp file */
1767
    /* XXX: better loading */
1768
    content = av_malloc(SDP_MAX_SIZE);
1769
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1770
    if (size <= 0) {
1771
        av_free(content);
1772
        return AVERROR_INVALIDDATA;
1773
    }
1774
    content[size] ='\0';
1775

    
1776
    sdp_parse(s, content);
1777
    av_free(content);
1778

    
1779
    /* open each RTP stream */
1780
    for(i=0;i<rt->nb_rtsp_streams;i++) {
1781
        rtsp_st = rt->rtsp_streams[i];
1782

    
1783
        snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1784
                 inet_ntoa(rtsp_st->sdp_ip),
1785
                 rtsp_st->sdp_port,
1786
                 rtsp_st->sdp_port,
1787
                 rtsp_st->sdp_ttl);
1788
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1789
            err = AVERROR_INVALIDDATA;
1790
            goto fail;
1791
        }
1792
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1793
            goto fail;
1794
    }
1795
    return 0;
1796
 fail:
1797
    rtsp_close_streams(rt);
1798
    return err;
1799
}
1800

    
1801
static int sdp_read_close(AVFormatContext *s)
1802
{
1803
    RTSPState *rt = s->priv_data;
1804
    rtsp_close_streams(rt);
1805
    return 0;
1806
}
1807

    
1808
AVInputFormat sdp_demuxer = {
1809
    "sdp",
1810
    NULL_IF_CONFIG_SMALL("SDP"),
1811
    sizeof(RTSPState),
1812
    sdp_probe,
1813
    sdp_read_header,
1814
    rtsp_fetch_packet,
1815
    sdp_read_close,
1816
};