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ffmpeg / libavformat / rtsp.c @ fd450a51

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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>
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#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);
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#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;
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                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 (s->oformat) {
586
                    AVFormatContext *rtpctx = rtsp_st->transport_priv;
587
                    av_write_trailer(rtpctx);
588
                    url_fclose(rtpctx->pb);
589
                    av_free(rtpctx->streams[0]);
590
                    av_free(rtpctx);
591
                } else if (rt->transport == RTSP_TRANSPORT_RDT)
592
                    ff_rdt_parse_close(rtsp_st->transport_priv);
593
                else
594
                    rtp_parse_close(rtsp_st->transport_priv);
595
            }
596
            if (rtsp_st->rtp_handle)
597
                url_close(rtsp_st->rtp_handle);
598
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
599
                rtsp_st->dynamic_handler->close(
600
                    rtsp_st->dynamic_protocol_context);
601
        }
602
    }
603
    av_free(rt->rtsp_streams);
604
    if (rt->asf_ctx) {
605
        av_close_input_stream (rt->asf_ctx);
606
        rt->asf_ctx = NULL;
607
    }
608
    av_freep(&rt->auth_b64);
609
}
610

    
611
static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st, URLContext *handle) {
612
    AVFormatContext *rtpctx;
613
    int ret;
614
    AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
615

    
616
    if (!rtp_format)
617
        return NULL;
618

    
619
    /* Allocate an AVFormatContext for each output stream */
620
    rtpctx = avformat_alloc_context();
621
    if (!rtpctx)
622
        return NULL;
623

    
624
    rtpctx->oformat = rtp_format;
625
    if (!av_new_stream(rtpctx, 0)) {
626
        av_free(rtpctx);
627
        return NULL;
628
    }
629
    /* Copy the max delay setting; the rtp muxer reads this. */
630
    rtpctx->max_delay = s->max_delay;
631
    /* Copy other stream parameters. */
632
    rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
633

    
634
    /* Remove the local codec, link to the original codec
635
     * context instead, to give the rtp muxer access to
636
     * codec parameters. */
637
    av_free(rtpctx->streams[0]->codec);
638
    rtpctx->streams[0]->codec = st->codec;
639

    
640
    url_fdopen(&rtpctx->pb, handle);
641
    ret = av_write_header(rtpctx);
642

    
643
    if (ret) {
644
        url_fclose(rtpctx->pb);
645
        av_free(rtpctx->streams[0]);
646
        av_free(rtpctx);
647
        return NULL;
648
    }
649

    
650
    /* Copy the RTP AVStream timebase back to the original AVStream */
651
    st->time_base = rtpctx->streams[0]->time_base;
652
    return rtpctx;
653
}
654

    
655
static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
656
{
657
    RTSPState *rt = s->priv_data;
658
    AVStream *st = NULL;
659

    
660
    /* open the RTP context */
661
    if (rtsp_st->stream_index >= 0)
662
        st = s->streams[rtsp_st->stream_index];
663
    if (!st)
664
        s->ctx_flags |= AVFMTCTX_NOHEADER;
665

    
666
    if (s->oformat) {
667
        rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
668
        /* Ownage of rtp_handle is passed to the rtp mux context */
669
        rtsp_st->rtp_handle = NULL;
670
    } else if (rt->transport == RTSP_TRANSPORT_RDT)
671
        rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
672
                                            rtsp_st->dynamic_protocol_context,
673
                                            rtsp_st->dynamic_handler);
674
    else
675
        rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
676
                                         rtsp_st->sdp_payload_type,
677
                                         &rtsp_st->rtp_payload_data);
678

    
679
    if (!rtsp_st->transport_priv) {
680
         return AVERROR(ENOMEM);
681
    } else if (rt->transport != RTSP_TRANSPORT_RDT) {
682
        if (rtsp_st->dynamic_handler) {
683
            rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
684
                                           rtsp_st->dynamic_protocol_context,
685
                                           rtsp_st->dynamic_handler);
686
        }
687
    }
688

    
689
    return 0;
690
}
691

    
692
#if CONFIG_RTSP_DEMUXER
693
static int rtsp_probe(AVProbeData *p)
694
{
695
    if (av_strstart(p->filename, "rtsp:", NULL))
696
        return AVPROBE_SCORE_MAX;
697
    return 0;
698
}
699

    
700
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
701
{
702
    const char *p;
703
    int v;
704

    
705
    p = *pp;
706
    skip_spaces(&p);
707
    v = strtol(p, (char **)&p, 10);
708
    if (*p == '-') {
709
        p++;
710
        *min_ptr = v;
711
        v = strtol(p, (char **)&p, 10);
712
        *max_ptr = v;
713
    } else {
714
        *min_ptr = v;
715
        *max_ptr = v;
716
    }
717
    *pp = p;
718
}
719

    
720
/* XXX: only one transport specification is parsed */
721
static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
722
{
723
    char transport_protocol[16];
724
    char profile[16];
725
    char lower_transport[16];
726
    char parameter[16];
727
    RTSPTransportField *th;
728
    char buf[256];
729

    
730
    reply->nb_transports = 0;
731

    
732
    for (;;) {
733
        skip_spaces(&p);
734
        if (*p == '\0')
735
            break;
736

    
737
        th = &reply->transports[reply->nb_transports];
738

    
739
        get_word_sep(transport_protocol, sizeof(transport_protocol),
740
                     "/", &p);
741
        if (!strcasecmp (transport_protocol, "rtp")) {
742
            get_word_sep(profile, sizeof(profile), "/;,", &p);
743
            lower_transport[0] = '\0';
744
            /* rtp/avp/<protocol> */
745
            if (*p == '/') {
746
                get_word_sep(lower_transport, sizeof(lower_transport),
747
                             ";,", &p);
748
            }
749
            th->transport = RTSP_TRANSPORT_RTP;
750
        } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
751
                   !strcasecmp (transport_protocol, "x-real-rdt")) {
752
            /* x-pn-tng/<protocol> */
753
            get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
754
            profile[0] = '\0';
755
            th->transport = RTSP_TRANSPORT_RDT;
756
        }
757
        if (!strcasecmp(lower_transport, "TCP"))
758
            th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
759
        else
760
            th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
761

    
762
        if (*p == ';')
763
            p++;
764
        /* get each parameter */
765
        while (*p != '\0' && *p != ',') {
766
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
767
            if (!strcmp(parameter, "port")) {
768
                if (*p == '=') {
769
                    p++;
770
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
771
                }
772
            } else if (!strcmp(parameter, "client_port")) {
773
                if (*p == '=') {
774
                    p++;
775
                    rtsp_parse_range(&th->client_port_min,
776
                                     &th->client_port_max, &p);
777
                }
778
            } else if (!strcmp(parameter, "server_port")) {
779
                if (*p == '=') {
780
                    p++;
781
                    rtsp_parse_range(&th->server_port_min,
782
                                     &th->server_port_max, &p);
783
                }
784
            } else if (!strcmp(parameter, "interleaved")) {
785
                if (*p == '=') {
786
                    p++;
787
                    rtsp_parse_range(&th->interleaved_min,
788
                                     &th->interleaved_max, &p);
789
                }
790
            } else if (!strcmp(parameter, "multicast")) {
791
                if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
792
                    th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
793
            } else if (!strcmp(parameter, "ttl")) {
794
                if (*p == '=') {
795
                    p++;
796
                    th->ttl = strtol(p, (char **)&p, 10);
797
                }
798
            } else if (!strcmp(parameter, "destination")) {
799
                struct in_addr ipaddr;
800

    
801
                if (*p == '=') {
802
                    p++;
803
                    get_word_sep(buf, sizeof(buf), ";,", &p);
804
                    if (inet_aton(buf, &ipaddr))
805
                        th->destination = ntohl(ipaddr.s_addr);
806
                }
807
            }
808
            while (*p != ';' && *p != '\0' && *p != ',')
809
                p++;
810
            if (*p == ';')
811
                p++;
812
        }
813
        if (*p == ',')
814
            p++;
815

    
816
        reply->nb_transports++;
817
    }
818
}
819

    
820
void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
821
{
822
    const char *p;
823

    
824
    /* NOTE: we do case independent match for broken servers */
825
    p = buf;
826
    if (av_stristart(p, "Session:", &p)) {
827
        int t;
828
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
829
        if (av_stristart(p, ";timeout=", &p) &&
830
            (t = strtol(p, NULL, 10)) > 0) {
831
            reply->timeout = t;
832
        }
833
    } else if (av_stristart(p, "Content-Length:", &p)) {
834
        reply->content_length = strtol(p, NULL, 10);
835
    } else if (av_stristart(p, "Transport:", &p)) {
836
        rtsp_parse_transport(reply, p);
837
    } else if (av_stristart(p, "CSeq:", &p)) {
838
        reply->seq = strtol(p, NULL, 10);
839
    } else if (av_stristart(p, "Range:", &p)) {
840
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
841
    } else if (av_stristart(p, "RealChallenge1:", &p)) {
842
        skip_spaces(&p);
843
        av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
844
    } else if (av_stristart(p, "Server:", &p)) {
845
        skip_spaces(&p);
846
        av_strlcpy(reply->server, p, sizeof(reply->server));
847
    } else if (av_stristart(p, "Notice:", &p) ||
848
               av_stristart(p, "X-Notice:", &p)) {
849
        reply->notice = strtol(p, NULL, 10);
850
    } else if (av_stristart(p, "Location:", &p)) {
851
        skip_spaces(&p);
852
        av_strlcpy(reply->location, p , sizeof(reply->location));
853
    }
854
}
855

    
856
/* skip a RTP/TCP interleaved packet */
857
static void rtsp_skip_packet(AVFormatContext *s)
858
{
859
    RTSPState *rt = s->priv_data;
860
    int ret, len, len1;
861
    uint8_t buf[1024];
862

    
863
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
864
    if (ret != 3)
865
        return;
866
    len = AV_RB16(buf + 1);
867

    
868
    dprintf(s, "skipping RTP packet len=%d\n", len);
869

    
870
    /* skip payload */
871
    while (len > 0) {
872
        len1 = len;
873
        if (len1 > sizeof(buf))
874
            len1 = sizeof(buf);
875
        ret = url_read_complete(rt->rtsp_hd, buf, len1);
876
        if (ret != len1)
877
            return;
878
        len -= len1;
879
    }
880
}
881

    
882
/**
883
 * Read a RTSP message from the server, or prepare to read data
884
 * packets if we're reading data interleaved over the TCP/RTSP
885
 * connection as well.
886
 *
887
 * @param s RTSP demuxer context
888
 * @param reply pointer where the RTSP message header will be stored
889
 * @param content_ptr pointer where the RTSP message body, if any, will
890
 *                    be stored (length is in reply)
891
 * @param return_on_interleaved_data whether the function may return if we
892
 *                   encounter a data marker ('$'), which precedes data
893
 *                   packets over interleaved TCP/RTSP connections. If this
894
 *                   is set, this function will return 1 after encountering
895
 *                   a '$'. If it is not set, the function will skip any
896
 *                   data packets (if they are encountered), until a reply
897
 *                   has been fully parsed. If no more data is available
898
 *                   without parsing a reply, it will return an error.
899
 *
900
 * @returns 1 if a data packets is ready to be received, -1 on error,
901
 *          and 0 on success.
902
 */
903
static int rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
904
                           unsigned char **content_ptr,
905
                           int return_on_interleaved_data)
906
{
907
    RTSPState *rt = s->priv_data;
908
    char buf[4096], buf1[1024], *q;
909
    unsigned char ch;
910
    const char *p;
911
    int ret, content_length, line_count = 0;
912
    unsigned char *content = NULL;
913

    
914
    memset(reply, 0, sizeof(*reply));
915

    
916
    /* parse reply (XXX: use buffers) */
917
    rt->last_reply[0] = '\0';
918
    for (;;) {
919
        q = buf;
920
        for (;;) {
921
            ret = url_read_complete(rt->rtsp_hd, &ch, 1);
922
#ifdef DEBUG_RTP_TCP
923
            dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
924
#endif
925
            if (ret != 1)
926
                return -1;
927
            if (ch == '\n')
928
                break;
929
            if (ch == '$') {
930
                /* XXX: only parse it if first char on line ? */
931
                if (return_on_interleaved_data) {
932
                    return 1;
933
                } else
934
                rtsp_skip_packet(s);
935
            } else if (ch != '\r') {
936
                if ((q - buf) < sizeof(buf) - 1)
937
                    *q++ = ch;
938
            }
939
        }
940
        *q = '\0';
941

    
942
        dprintf(s, "line='%s'\n", buf);
943

    
944
        /* test if last line */
945
        if (buf[0] == '\0')
946
            break;
947
        p = buf;
948
        if (line_count == 0) {
949
            /* get reply code */
950
            get_word(buf1, sizeof(buf1), &p);
951
            get_word(buf1, sizeof(buf1), &p);
952
            reply->status_code = atoi(buf1);
953
        } else {
954
            rtsp_parse_line(reply, p);
955
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
956
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
957
        }
958
        line_count++;
959
    }
960

    
961
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
962
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
963

    
964
    content_length = reply->content_length;
965
    if (content_length > 0) {
966
        /* leave some room for a trailing '\0' (useful for simple parsing) */
967
        content = av_malloc(content_length + 1);
968
        (void)url_read_complete(rt->rtsp_hd, content, content_length);
969
        content[content_length] = '\0';
970
    }
971
    if (content_ptr)
972
        *content_ptr = content;
973
    else
974
        av_free(content);
975

    
976
    /* EOS */
977
    if (reply->notice == 2101 /* End-of-Stream Reached */      ||
978
        reply->notice == 2104 /* Start-of-Stream Reached */    ||
979
        reply->notice == 2306 /* Continuous Feed Terminated */) {
980
        rt->state = RTSP_STATE_IDLE;
981
    } else if (reply->notice >= 4400 && reply->notice < 5500) {
982
        return AVERROR(EIO); /* data or server error */
983
    } else if (reply->notice == 2401 /* Ticket Expired */ ||
984
             (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
985
        return AVERROR(EPERM);
986

    
987
    return 0;
988
}
989

    
990
static void rtsp_send_cmd_with_content_async(AVFormatContext *s,
991
                                             const char *cmd,
992
                                             const unsigned char *send_content,
993
                                             int send_content_length)
994
{
995
    RTSPState *rt = s->priv_data;
996
    char buf[4096], buf1[1024];
997

    
998
    rt->seq++;
999
    av_strlcpy(buf, cmd, sizeof(buf));
1000
    snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
1001
    av_strlcat(buf, buf1, sizeof(buf));
1002
    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
1003
        snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
1004
        av_strlcat(buf, buf1, sizeof(buf));
1005
    }
1006
    if (rt->auth_b64)
1007
        av_strlcatf(buf, sizeof(buf),
1008
                    "Authorization: Basic %s\r\n",
1009
                    rt->auth_b64);
1010
    if (send_content_length > 0 && send_content)
1011
        av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
1012
    av_strlcat(buf, "\r\n", sizeof(buf));
1013

    
1014
    dprintf(s, "Sending:\n%s--\n", buf);
1015

    
1016
    url_write(rt->rtsp_hd, buf, strlen(buf));
1017
    if (send_content_length > 0 && send_content)
1018
        url_write(rt->rtsp_hd, send_content, send_content_length);
1019
    rt->last_cmd_time = av_gettime();
1020
}
1021

    
1022
static void rtsp_send_cmd_async(AVFormatContext *s, const char *cmd)
1023
{
1024
    rtsp_send_cmd_with_content_async(s, cmd, NULL, 0);
1025
}
1026

    
1027
static void rtsp_send_cmd(AVFormatContext *s,
1028
                          const char *cmd, RTSPMessageHeader *reply,
1029
                          unsigned char **content_ptr)
1030
{
1031
    rtsp_send_cmd_async(s, cmd);
1032

    
1033
    rtsp_read_reply(s, reply, content_ptr, 0);
1034
}
1035

    
1036
static void rtsp_send_cmd_with_content(AVFormatContext *s,
1037
                                       const char *cmd,
1038
                                       RTSPMessageHeader *reply,
1039
                                       unsigned char **content_ptr,
1040
                                       const unsigned char *send_content,
1041
                                       int send_content_length)
1042
{
1043
    rtsp_send_cmd_with_content_async(s, cmd, send_content, send_content_length);
1044

    
1045
    rtsp_read_reply(s, reply, content_ptr, 0);
1046
}
1047

    
1048
/**
1049
 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
1050
 */
1051
static int make_setup_request(AVFormatContext *s, const char *host, int port,
1052
                              int lower_transport, const char *real_challenge)
1053
{
1054
    RTSPState *rt = s->priv_data;
1055
    int rtx, j, i, err, interleave = 0;
1056
    RTSPStream *rtsp_st;
1057
    RTSPMessageHeader reply1, *reply = &reply1;
1058
    char cmd[2048];
1059
    const char *trans_pref;
1060

    
1061
    if (rt->transport == RTSP_TRANSPORT_RDT)
1062
        trans_pref = "x-pn-tng";
1063
    else
1064
        trans_pref = "RTP/AVP";
1065

    
1066
    /* default timeout: 1 minute */
1067
    rt->timeout = 60;
1068

    
1069
    /* for each stream, make the setup request */
1070
    /* XXX: we assume the same server is used for the control of each
1071
     * RTSP stream */
1072

    
1073
    for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1074
        char transport[2048];
1075

    
1076
        /**
1077
         * WMS serves all UDP data over a single connection, the RTX, which
1078
         * isn't necessarily the first in the SDP but has to be the first
1079
         * to be set up, else the second/third SETUP will fail with a 461.
1080
         */
1081
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1082
             rt->server_type == RTSP_SERVER_WMS) {
1083
            if (i == 0) {
1084
                /* rtx first */
1085
                for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1086
                    int len = strlen(rt->rtsp_streams[rtx]->control_url);
1087
                    if (len >= 4 &&
1088
                        !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1089
                                "/rtx"))
1090
                        break;
1091
                }
1092
                if (rtx == rt->nb_rtsp_streams)
1093
                    return -1; /* no RTX found */
1094
                rtsp_st = rt->rtsp_streams[rtx];
1095
            } else
1096
                rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1097
        } else
1098
            rtsp_st = rt->rtsp_streams[i];
1099

    
1100
        /* RTP/UDP */
1101
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1102
            char buf[256];
1103

    
1104
            if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1105
                port = reply->transports[0].client_port_min;
1106
                goto have_port;
1107
            }
1108

    
1109
            /* first try in specified port range */
1110
            if (RTSP_RTP_PORT_MIN != 0) {
1111
                while (j <= RTSP_RTP_PORT_MAX) {
1112
                    snprintf(buf, sizeof(buf), "rtp://%s?localport=%d",
1113
                             host, j);
1114
                    /* we will use two ports per rtp stream (rtp and rtcp) */
1115
                    j += 2;
1116
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1117
                        goto rtp_opened;
1118
                }
1119
            }
1120

    
1121
#if 0
1122
            /* then try on any port */
1123
            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1124
                err = AVERROR_INVALIDDATA;
1125
                goto fail;
1126
            }
1127
#endif
1128

    
1129
        rtp_opened:
1130
            port = rtp_get_local_port(rtsp_st->rtp_handle);
1131
        have_port:
1132
            snprintf(transport, sizeof(transport) - 1,
1133
                     "%s/UDP;", trans_pref);
1134
            if (rt->server_type != RTSP_SERVER_REAL)
1135
                av_strlcat(transport, "unicast;", sizeof(transport));
1136
            av_strlcatf(transport, sizeof(transport),
1137
                     "client_port=%d", port);
1138
            if (rt->transport == RTSP_TRANSPORT_RTP &&
1139
                !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1140
                av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1141
        }
1142

    
1143
        /* RTP/TCP */
1144
        else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1145
            /** For WMS streams, the application streams are only used for
1146
             * UDP. When trying to set it up for TCP streams, the server
1147
             * will return an error. Therefore, we skip those streams. */
1148
            if (rt->server_type == RTSP_SERVER_WMS &&
1149
                s->streams[rtsp_st->stream_index]->codec->codec_type ==
1150
                    CODEC_TYPE_DATA)
1151
                continue;
1152
            snprintf(transport, sizeof(transport) - 1,
1153
                     "%s/TCP;", trans_pref);
1154
            if (rt->server_type == RTSP_SERVER_WMS)
1155
                av_strlcat(transport, "unicast;", sizeof(transport));
1156
            av_strlcatf(transport, sizeof(transport),
1157
                        "interleaved=%d-%d",
1158
                        interleave, interleave + 1);
1159
            interleave += 2;
1160
        }
1161

    
1162
        else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1163
            snprintf(transport, sizeof(transport) - 1,
1164
                     "%s/UDP;multicast", trans_pref);
1165
        }
1166
        if (s->oformat) {
1167
            av_strlcat(transport, ";mode=receive", sizeof(transport));
1168
        } else if (rt->server_type == RTSP_SERVER_REAL ||
1169
            rt->server_type == RTSP_SERVER_WMS)
1170
            av_strlcat(transport, ";mode=play", sizeof(transport));
1171
        snprintf(cmd, sizeof(cmd),
1172
                 "SETUP %s RTSP/1.0\r\n"
1173
                 "Transport: %s\r\n",
1174
                 rtsp_st->control_url, transport);
1175
        if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1176
            char real_res[41], real_csum[9];
1177
            ff_rdt_calc_response_and_checksum(real_res, real_csum,
1178
                                              real_challenge);
1179
            av_strlcatf(cmd, sizeof(cmd),
1180
                        "If-Match: %s\r\n"
1181
                        "RealChallenge2: %s, sd=%s\r\n",
1182
                        rt->session_id, real_res, real_csum);
1183
        }
1184
        rtsp_send_cmd(s, cmd, reply, NULL);
1185
        if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1186
            err = 1;
1187
            goto fail;
1188
        } else if (reply->status_code != RTSP_STATUS_OK ||
1189
                   reply->nb_transports != 1) {
1190
            err = AVERROR_INVALIDDATA;
1191
            goto fail;
1192
        }
1193

    
1194
        /* XXX: same protocol for all streams is required */
1195
        if (i > 0) {
1196
            if (reply->transports[0].lower_transport != rt->lower_transport ||
1197
                reply->transports[0].transport != rt->transport) {
1198
                err = AVERROR_INVALIDDATA;
1199
                goto fail;
1200
            }
1201
        } else {
1202
            rt->lower_transport = reply->transports[0].lower_transport;
1203
            rt->transport = reply->transports[0].transport;
1204
        }
1205

    
1206
        /* close RTP connection if not choosen */
1207
        if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1208
            (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1209
            url_close(rtsp_st->rtp_handle);
1210
            rtsp_st->rtp_handle = NULL;
1211
        }
1212

    
1213
        switch(reply->transports[0].lower_transport) {
1214
        case RTSP_LOWER_TRANSPORT_TCP:
1215
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1216
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1217
            break;
1218

    
1219
        case RTSP_LOWER_TRANSPORT_UDP: {
1220
            char url[1024];
1221

    
1222
            /* XXX: also use address if specified */
1223
            snprintf(url, sizeof(url), "rtp://%s:%d",
1224
                     host, reply->transports[0].server_port_min);
1225
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1226
                rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1227
                err = AVERROR_INVALIDDATA;
1228
                goto fail;
1229
            }
1230
            /* Try to initialize the connection state in a
1231
             * potential NAT router by sending dummy packets.
1232
             * RTP/RTCP dummy packets are used for RDT, too.
1233
             */
1234
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1235
                rtp_send_punch_packets(rtsp_st->rtp_handle);
1236
            break;
1237
        }
1238
        case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1239
            char url[1024];
1240
            struct in_addr in;
1241
            int port, ttl;
1242

    
1243
            if (reply->transports[0].destination) {
1244
                in.s_addr = htonl(reply->transports[0].destination);
1245
                port      = reply->transports[0].port_min;
1246
                ttl       = reply->transports[0].ttl;
1247
            } else {
1248
                in        = rtsp_st->sdp_ip;
1249
                port      = rtsp_st->sdp_port;
1250
                ttl       = rtsp_st->sdp_ttl;
1251
            }
1252
            snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1253
                     inet_ntoa(in), port, ttl);
1254
            if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1255
                err = AVERROR_INVALIDDATA;
1256
                goto fail;
1257
            }
1258
            break;
1259
        }
1260
        }
1261

    
1262
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1263
            goto fail;
1264
    }
1265

    
1266
    if (reply->timeout > 0)
1267
        rt->timeout = reply->timeout;
1268

    
1269
    if (rt->server_type == RTSP_SERVER_REAL)
1270
        rt->need_subscription = 1;
1271

    
1272
    return 0;
1273

    
1274
fail:
1275
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1276
        if (rt->rtsp_streams[i]->rtp_handle) {
1277
            url_close(rt->rtsp_streams[i]->rtp_handle);
1278
            rt->rtsp_streams[i]->rtp_handle = NULL;
1279
        }
1280
    }
1281
    return err;
1282
}
1283

    
1284
static int rtsp_read_play(AVFormatContext *s)
1285
{
1286
    RTSPState *rt = s->priv_data;
1287
    RTSPMessageHeader reply1, *reply = &reply1;
1288
    char cmd[1024];
1289

    
1290
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1291

    
1292
    if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1293
        if (rt->state == RTSP_STATE_PAUSED) {
1294
            snprintf(cmd, sizeof(cmd),
1295
                     "PLAY %s RTSP/1.0\r\n",
1296
                     rt->control_uri);
1297
        } else {
1298
            snprintf(cmd, sizeof(cmd),
1299
                     "PLAY %s RTSP/1.0\r\n"
1300
                     "Range: npt=%0.3f-\r\n",
1301
                     rt->control_uri,
1302
                     (double)rt->seek_timestamp / AV_TIME_BASE);
1303
        }
1304
        rtsp_send_cmd(s, cmd, reply, NULL);
1305
        if (reply->status_code != RTSP_STATUS_OK) {
1306
            return -1;
1307
        }
1308
    }
1309
    rt->state = RTSP_STATE_STREAMING;
1310
    return 0;
1311
}
1312

    
1313
static int rtsp_setup_input_streams(AVFormatContext *s)
1314
{
1315
    RTSPState *rt = s->priv_data;
1316
    RTSPMessageHeader reply1, *reply = &reply1;
1317
    char cmd[1024];
1318
    unsigned char *content = NULL;
1319
    int ret;
1320

    
1321
    /* describe the stream */
1322
    snprintf(cmd, sizeof(cmd),
1323
             "DESCRIBE %s RTSP/1.0\r\n"
1324
             "Accept: application/sdp\r\n",
1325
             s->filename);
1326
    if (rt->server_type == RTSP_SERVER_REAL) {
1327
        /**
1328
         * The Require: attribute is needed for proper streaming from
1329
         * Realmedia servers.
1330
         */
1331
        av_strlcat(cmd,
1332
                   "Require: com.real.retain-entity-for-setup\r\n",
1333
                   sizeof(cmd));
1334
    }
1335
    rtsp_send_cmd(s, cmd, reply, &content);
1336
    if (!content)
1337
        return AVERROR_INVALIDDATA;
1338
    if (reply->status_code != RTSP_STATUS_OK) {
1339
        av_freep(&content);
1340
        return AVERROR_INVALIDDATA;
1341
    }
1342

    
1343
    /* now we got the SDP description, we parse it */
1344
    ret = sdp_parse(s, (const char *)content);
1345
    av_freep(&content);
1346
    if (ret < 0)
1347
        return AVERROR_INVALIDDATA;
1348

    
1349
    return 0;
1350
}
1351

    
1352
static int rtsp_connect(AVFormatContext *s)
1353
{
1354
    RTSPState *rt = s->priv_data;
1355
    char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1356
    char *option_list, *option, *filename;
1357
    URLContext *rtsp_hd;
1358
    int port, err;
1359
    RTSPMessageHeader reply1, *reply = &reply1;
1360
    int lower_transport_mask = 0;
1361
    char real_challenge[64];
1362
redirect:
1363
    /* extract hostname and port */
1364
    url_split(NULL, 0, auth, sizeof(auth),
1365
              host, sizeof(host), &port, path, sizeof(path), s->filename);
1366
    if (*auth) {
1367
        int auth_len = strlen(auth), b64_len = ((auth_len + 2) / 3) * 4 + 1;
1368

    
1369
        if (!(rt->auth_b64 = av_malloc(b64_len)))
1370
            return AVERROR(ENOMEM);
1371
        if (!av_base64_encode(rt->auth_b64, b64_len, auth, auth_len)) {
1372
            err = AVERROR(EINVAL);
1373
            goto fail;
1374
        }
1375
    }
1376
    if (port < 0)
1377
        port = RTSP_DEFAULT_PORT;
1378

    
1379
    /* search for options */
1380
    option_list = strchr(path, '?');
1381
    if (option_list) {
1382
        filename = strchr(s->filename, '?');
1383
        while (option_list) {
1384
            /* move the option pointer */
1385
            option = ++option_list;
1386
            option_list = strchr(option_list, '&');
1387
            if (option_list)
1388
                *option_list = 0;
1389

    
1390
            /* handle the options */
1391
            if (!strcmp(option, "udp")) {
1392
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1393
            } else if (!strcmp(option, "multicast")) {
1394
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1395
            } else if (!strcmp(option, "tcp")) {
1396
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1397
            } else {
1398
                strcpy(++filename, option);
1399
                filename += strlen(option);
1400
                if (option_list) *filename = '&';
1401
            }
1402
        }
1403
        *filename = 0;
1404
    }
1405

    
1406
    if (!lower_transport_mask)
1407
        lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1408

    
1409
    /* open the tcp connexion */
1410
    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1411
    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0) {
1412
        err = AVERROR(EIO);
1413
        goto fail;
1414
    }
1415
    rt->rtsp_hd = rtsp_hd;
1416
    rt->seq = 0;
1417

    
1418
    /* request options supported by the server; this also detects server
1419
     * type */
1420
    av_strlcpy(rt->control_uri, s->filename,
1421
               sizeof(rt->control_uri));
1422
    for (rt->server_type = RTSP_SERVER_RTP;;) {
1423
        snprintf(cmd, sizeof(cmd),
1424
                 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1425
        if (rt->server_type == RTSP_SERVER_REAL)
1426
            av_strlcat(cmd,
1427
                       /**
1428
                        * The following entries are required for proper
1429
                        * streaming from a Realmedia server. They are
1430
                        * interdependent in some way although we currently
1431
                        * don't quite understand how. Values were copied
1432
                        * from mplayer SVN r23589.
1433
                        * @param CompanyID is a 16-byte ID in base64
1434
                        * @param ClientChallenge is a 16-byte ID in hex
1435
                        */
1436
                       "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1437
                       "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1438
                       "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1439
                       "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1440
                       sizeof(cmd));
1441
        rtsp_send_cmd(s, cmd, reply, NULL);
1442
        if (reply->status_code != RTSP_STATUS_OK) {
1443
            err = AVERROR_INVALIDDATA;
1444
            goto fail;
1445
        }
1446

    
1447
        /* detect server type if not standard-compliant RTP */
1448
        if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1449
            rt->server_type = RTSP_SERVER_REAL;
1450
            continue;
1451
        } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1452
            rt->server_type = RTSP_SERVER_WMS;
1453
        } else if (rt->server_type == RTSP_SERVER_REAL)
1454
            strcpy(real_challenge, reply->real_challenge);
1455
        break;
1456
    }
1457

    
1458
    err = rtsp_setup_input_streams(s);
1459
    if (err)
1460
        goto fail;
1461

    
1462
    do {
1463
        int lower_transport = ff_log2_tab[lower_transport_mask &
1464
                                  ~(lower_transport_mask - 1)];
1465

    
1466
        err = make_setup_request(s, host, port, lower_transport,
1467
                                 rt->server_type == RTSP_SERVER_REAL ?
1468
                                     real_challenge : NULL);
1469
        if (err < 0)
1470
            goto fail;
1471
        lower_transport_mask &= ~(1 << lower_transport);
1472
        if (lower_transport_mask == 0 && err == 1) {
1473
            err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1474
            goto fail;
1475
        }
1476
    } while (err);
1477

    
1478
    rt->state = RTSP_STATE_IDLE;
1479
    rt->seek_timestamp = 0; /* default is to start stream at position zero */
1480
    return 0;
1481
 fail:
1482
    rtsp_close_streams(s);
1483
    url_close(rt->rtsp_hd);
1484
    if (reply->status_code >=300 && reply->status_code < 400) {
1485
        av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1486
        av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1487
               reply->status_code,
1488
               s->filename);
1489
        goto redirect;
1490
    }
1491
    return err;
1492
}
1493

    
1494
static int rtsp_read_header(AVFormatContext *s,
1495
                            AVFormatParameters *ap)
1496
{
1497
    RTSPState *rt = s->priv_data;
1498
    int ret;
1499

    
1500
    ret = rtsp_connect(s);
1501
    if (ret)
1502
        return ret;
1503

    
1504
    if (ap->initial_pause) {
1505
         /* do not start immediately */
1506
    } else {
1507
         if (rtsp_read_play(s) < 0) {
1508
            rtsp_close_streams(s);
1509
            url_close(rt->rtsp_hd);
1510
            return AVERROR_INVALIDDATA;
1511
        }
1512
    }
1513

    
1514
    return 0;
1515
}
1516

    
1517
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1518
                           uint8_t *buf, int buf_size)
1519
{
1520
    RTSPState *rt = s->priv_data;
1521
    RTSPStream *rtsp_st;
1522
    fd_set rfds;
1523
    int fd, fd_max, n, i, ret, tcp_fd;
1524
    struct timeval tv;
1525

    
1526
    for (;;) {
1527
        if (url_interrupt_cb())
1528
            return AVERROR(EINTR);
1529
        FD_ZERO(&rfds);
1530
        if (rt->rtsp_hd) {
1531
            tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1532
            FD_SET(tcp_fd, &rfds);
1533
        } else {
1534
            fd_max = 0;
1535
            tcp_fd = -1;
1536
        }
1537
        for (i = 0; i < rt->nb_rtsp_streams; i++) {
1538
            rtsp_st = rt->rtsp_streams[i];
1539
            if (rtsp_st->rtp_handle) {
1540
                /* currently, we cannot probe RTCP handle because of
1541
                 * blocking restrictions */
1542
                fd = url_get_file_handle(rtsp_st->rtp_handle);
1543
                if (fd > fd_max)
1544
                    fd_max = fd;
1545
                FD_SET(fd, &rfds);
1546
            }
1547
        }
1548
        tv.tv_sec = 0;
1549
        tv.tv_usec = 100 * 1000;
1550
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1551
        if (n > 0) {
1552
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1553
                rtsp_st = rt->rtsp_streams[i];
1554
                if (rtsp_st->rtp_handle) {
1555
                    fd = url_get_file_handle(rtsp_st->rtp_handle);
1556
                    if (FD_ISSET(fd, &rfds)) {
1557
                        ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1558
                        if (ret > 0) {
1559
                            *prtsp_st = rtsp_st;
1560
                            return ret;
1561
                        }
1562
                    }
1563
                }
1564
            }
1565
#if CONFIG_RTSP_DEMUXER
1566
            if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1567
                RTSPMessageHeader reply;
1568

    
1569
                rtsp_read_reply(s, &reply, NULL, 0);
1570
                /* XXX: parse message */
1571
                if (rt->state != RTSP_STATE_STREAMING)
1572
                    return 0;
1573
            }
1574
#endif
1575
        }
1576
    }
1577
}
1578

    
1579
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1580
                           uint8_t *buf, int buf_size)
1581
{
1582
    RTSPState *rt = s->priv_data;
1583
    int id, len, i, ret;
1584
    RTSPStream *rtsp_st;
1585

    
1586
#ifdef DEBUG_RTP_TCP
1587
    dprintf(s, "tcp_read_packet:\n");
1588
#endif
1589
redo:
1590
    for (;;) {
1591
        RTSPMessageHeader reply;
1592

    
1593
        ret = rtsp_read_reply(s, &reply, NULL, 1);
1594
        if (ret == -1)
1595
            return -1;
1596
        if (ret == 1) /* received '$' */
1597
            break;
1598
        /* XXX: parse message */
1599
        if (rt->state != RTSP_STATE_STREAMING)
1600
            return 0;
1601
    }
1602
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
1603
    if (ret != 3)
1604
        return -1;
1605
    id  = buf[0];
1606
    len = AV_RB16(buf + 1);
1607
#ifdef DEBUG_RTP_TCP
1608
    dprintf(s, "id=%d len=%d\n", id, len);
1609
#endif
1610
    if (len > buf_size || len < 12)
1611
        goto redo;
1612
    /* get the data */
1613
    ret = url_read_complete(rt->rtsp_hd, buf, len);
1614
    if (ret != len)
1615
        return -1;
1616
    if (rt->transport == RTSP_TRANSPORT_RDT &&
1617
        ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1618
        return -1;
1619

    
1620
    /* find the matching stream */
1621
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1622
        rtsp_st = rt->rtsp_streams[i];
1623
        if (id >= rtsp_st->interleaved_min &&
1624
            id <= rtsp_st->interleaved_max)
1625
            goto found;
1626
    }
1627
    goto redo;
1628
found:
1629
    *prtsp_st = rtsp_st;
1630
    return len;
1631
}
1632

    
1633
static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1634
{
1635
    RTSPState *rt = s->priv_data;
1636
    int ret, len;
1637
    uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1638
    RTSPStream *rtsp_st;
1639

    
1640
    /* get next frames from the same RTP packet */
1641
    if (rt->cur_transport_priv) {
1642
        if (rt->transport == RTSP_TRANSPORT_RDT) {
1643
            ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1644
        } else
1645
            ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1646
        if (ret == 0) {
1647
            rt->cur_transport_priv = NULL;
1648
            return 0;
1649
        } else if (ret == 1) {
1650
            return 0;
1651
        } else
1652
            rt->cur_transport_priv = NULL;
1653
    }
1654

    
1655
    /* read next RTP packet */
1656
 redo:
1657
    switch(rt->lower_transport) {
1658
    default:
1659
#if CONFIG_RTSP_DEMUXER
1660
    case RTSP_LOWER_TRANSPORT_TCP:
1661
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1662
        break;
1663
#endif
1664
    case RTSP_LOWER_TRANSPORT_UDP:
1665
    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1666
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1667
        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1668
            rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1669
        break;
1670
    }
1671
    if (len < 0)
1672
        return len;
1673
    if (len == 0)
1674
        return AVERROR_EOF;
1675
    if (rt->transport == RTSP_TRANSPORT_RDT) {
1676
        ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1677
    } else
1678
        ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1679
    if (ret < 0)
1680
        goto redo;
1681
    if (ret == 1)
1682
        /* more packets may follow, so we save the RTP context */
1683
        rt->cur_transport_priv = rtsp_st->transport_priv;
1684

    
1685
    return ret;
1686
}
1687

    
1688
static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1689
{
1690
    RTSPState *rt = s->priv_data;
1691
    int ret;
1692
    RTSPMessageHeader reply1, *reply = &reply1;
1693
    char cmd[1024];
1694

    
1695
    if (rt->server_type == RTSP_SERVER_REAL) {
1696
        int i;
1697
        enum AVDiscard cache[MAX_STREAMS];
1698

    
1699
        for (i = 0; i < s->nb_streams; i++)
1700
            cache[i] = s->streams[i]->discard;
1701

    
1702
        if (!rt->need_subscription) {
1703
            if (memcmp (cache, rt->real_setup_cache,
1704
                        sizeof(enum AVDiscard) * s->nb_streams)) {
1705
                snprintf(cmd, sizeof(cmd),
1706
                         "SET_PARAMETER %s RTSP/1.0\r\n"
1707
                         "Unsubscribe: %s\r\n",
1708
                         rt->control_uri, rt->last_subscription);
1709
                rtsp_send_cmd(s, cmd, reply, NULL);
1710
                if (reply->status_code != RTSP_STATUS_OK)
1711
                    return AVERROR_INVALIDDATA;
1712
                rt->need_subscription = 1;
1713
            }
1714
        }
1715

    
1716
        if (rt->need_subscription) {
1717
            int r, rule_nr, first = 1;
1718

    
1719
            memcpy(rt->real_setup_cache, cache,
1720
                   sizeof(enum AVDiscard) * s->nb_streams);
1721
            rt->last_subscription[0] = 0;
1722

    
1723
            snprintf(cmd, sizeof(cmd),
1724
                     "SET_PARAMETER %s RTSP/1.0\r\n"
1725
                     "Subscribe: ",
1726
                     rt->control_uri);
1727
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1728
                rule_nr = 0;
1729
                for (r = 0; r < s->nb_streams; r++) {
1730
                    if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1731
                        if (s->streams[r]->discard != AVDISCARD_ALL) {
1732
                            if (!first)
1733
                                av_strlcat(rt->last_subscription, ",",
1734
                                           sizeof(rt->last_subscription));
1735
                            ff_rdt_subscribe_rule(
1736
                                rt->last_subscription,
1737
                                sizeof(rt->last_subscription), i, rule_nr);
1738
                            first = 0;
1739
                        }
1740
                        rule_nr++;
1741
                    }
1742
                }
1743
            }
1744
            av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1745
            rtsp_send_cmd(s, cmd, reply, NULL);
1746
            if (reply->status_code != RTSP_STATUS_OK)
1747
                return AVERROR_INVALIDDATA;
1748
            rt->need_subscription = 0;
1749

    
1750
            if (rt->state == RTSP_STATE_STREAMING)
1751
                rtsp_read_play (s);
1752
        }
1753
    }
1754

    
1755
    ret = rtsp_fetch_packet(s, pkt);
1756
    if (ret < 0)
1757
        return ret;
1758

    
1759
    /* send dummy request to keep TCP connection alive */
1760
    if ((rt->server_type == RTSP_SERVER_WMS ||
1761
         rt->server_type == RTSP_SERVER_REAL) &&
1762
        (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1763
        if (rt->server_type == RTSP_SERVER_WMS) {
1764
            snprintf(cmd, sizeof(cmd) - 1,
1765
                     "GET_PARAMETER %s RTSP/1.0\r\n",
1766
                     rt->control_uri);
1767
            rtsp_send_cmd_async(s, cmd);
1768
        } else {
1769
            rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n");
1770
        }
1771
    }
1772

    
1773
    return 0;
1774
}
1775

    
1776
/* pause the stream */
1777
static int rtsp_read_pause(AVFormatContext *s)
1778
{
1779
    RTSPState *rt = s->priv_data;
1780
    RTSPMessageHeader reply1, *reply = &reply1;
1781
    char cmd[1024];
1782

    
1783
    rt = s->priv_data;
1784

    
1785
    if (rt->state != RTSP_STATE_STREAMING)
1786
        return 0;
1787
    else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1788
        snprintf(cmd, sizeof(cmd),
1789
                 "PAUSE %s RTSP/1.0\r\n",
1790
                 rt->control_uri);
1791
        rtsp_send_cmd(s, cmd, reply, NULL);
1792
        if (reply->status_code != RTSP_STATUS_OK) {
1793
            return -1;
1794
        }
1795
    }
1796
    rt->state = RTSP_STATE_PAUSED;
1797
    return 0;
1798
}
1799

    
1800
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1801
                          int64_t timestamp, int flags)
1802
{
1803
    RTSPState *rt = s->priv_data;
1804

    
1805
    rt->seek_timestamp = av_rescale_q(timestamp,
1806
                                      s->streams[stream_index]->time_base,
1807
                                      AV_TIME_BASE_Q);
1808
    switch(rt->state) {
1809
    default:
1810
    case RTSP_STATE_IDLE:
1811
        break;
1812
    case RTSP_STATE_STREAMING:
1813
        if (rtsp_read_pause(s) != 0)
1814
            return -1;
1815
        rt->state = RTSP_STATE_SEEKING;
1816
        if (rtsp_read_play(s) != 0)
1817
            return -1;
1818
        break;
1819
    case RTSP_STATE_PAUSED:
1820
        rt->state = RTSP_STATE_IDLE;
1821
        break;
1822
    }
1823
    return 0;
1824
}
1825

    
1826
static int rtsp_read_close(AVFormatContext *s)
1827
{
1828
    RTSPState *rt = s->priv_data;
1829
    char cmd[1024];
1830

    
1831
#if 0
1832
    /* NOTE: it is valid to flush the buffer here */
1833
    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1834
        url_fclose(&rt->rtsp_gb);
1835
    }
1836
#endif
1837
    snprintf(cmd, sizeof(cmd),
1838
             "TEARDOWN %s RTSP/1.0\r\n",
1839
             s->filename);
1840
    rtsp_send_cmd_async(s, cmd);
1841

    
1842
    rtsp_close_streams(s);
1843
    url_close(rt->rtsp_hd);
1844
    return 0;
1845
}
1846

    
1847
AVInputFormat rtsp_demuxer = {
1848
    "rtsp",
1849
    NULL_IF_CONFIG_SMALL("RTSP input format"),
1850
    sizeof(RTSPState),
1851
    rtsp_probe,
1852
    rtsp_read_header,
1853
    rtsp_read_packet,
1854
    rtsp_read_close,
1855
    rtsp_read_seek,
1856
    .flags = AVFMT_NOFILE,
1857
    .read_play = rtsp_read_play,
1858
    .read_pause = rtsp_read_pause,
1859
};
1860
#endif
1861

    
1862
static int sdp_probe(AVProbeData *p1)
1863
{
1864
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1865

    
1866
    /* we look for a line beginning "c=IN IP4" */
1867
    while (p < p_end && *p != '\0') {
1868
        if (p + sizeof("c=IN IP4") - 1 < p_end &&
1869
            av_strstart(p, "c=IN IP4", NULL))
1870
            return AVPROBE_SCORE_MAX / 2;
1871

    
1872
        while (p < p_end - 1 && *p != '\n') p++;
1873
        if (++p >= p_end)
1874
            break;
1875
        if (*p == '\r')
1876
            p++;
1877
    }
1878
    return 0;
1879
}
1880

    
1881
#define SDP_MAX_SIZE 8192
1882

    
1883
static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
1884
{
1885
    RTSPState *rt = s->priv_data;
1886
    RTSPStream *rtsp_st;
1887
    int size, i, err;
1888
    char *content;
1889
    char url[1024];
1890

    
1891
    /* read the whole sdp file */
1892
    /* XXX: better loading */
1893
    content = av_malloc(SDP_MAX_SIZE);
1894
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1895
    if (size <= 0) {
1896
        av_free(content);
1897
        return AVERROR_INVALIDDATA;
1898
    }
1899
    content[size] ='\0';
1900

    
1901
    sdp_parse(s, content);
1902
    av_free(content);
1903

    
1904
    /* open each RTP stream */
1905
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1906
        rtsp_st = rt->rtsp_streams[i];
1907

    
1908
        snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1909
                 inet_ntoa(rtsp_st->sdp_ip),
1910
                 rtsp_st->sdp_port,
1911
                 rtsp_st->sdp_port,
1912
                 rtsp_st->sdp_ttl);
1913
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1914
            err = AVERROR_INVALIDDATA;
1915
            goto fail;
1916
        }
1917
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1918
            goto fail;
1919
    }
1920
    return 0;
1921
fail:
1922
    rtsp_close_streams(s);
1923
    return err;
1924
}
1925

    
1926
static int sdp_read_close(AVFormatContext *s)
1927
{
1928
    rtsp_close_streams(s);
1929
    return 0;
1930
}
1931

    
1932
AVInputFormat sdp_demuxer = {
1933
    "sdp",
1934
    NULL_IF_CONFIG_SMALL("SDP"),
1935
    sizeof(RTSPState),
1936
    sdp_probe,
1937
    sdp_read_header,
1938
    rtsp_fetch_packet,
1939
    sdp_read_close,
1940
};