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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
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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() */
23
#define _SVID_SOURCE
24

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

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

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

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

    
46
#if LIBAVFORMAT_VERSION_INT < (53 << 16)
47
int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
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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++;
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    }
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 ff_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 (ff_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
void ff_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_metadata_free(&rtpctx->streams[0]->metadata);
590
                    av_metadata_free(&rtpctx->metadata);
591
                    av_free(rtpctx->streams[0]);
592
                    av_free(rtpctx);
593
                } else if (rt->transport == RTSP_TRANSPORT_RDT)
594
                    ff_rdt_parse_close(rtsp_st->transport_priv);
595
                else
596
                    rtp_parse_close(rtsp_st->transport_priv);
597
            }
598
            if (rtsp_st->rtp_handle)
599
                url_close(rtsp_st->rtp_handle);
600
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
601
                rtsp_st->dynamic_handler->close(
602
                    rtsp_st->dynamic_protocol_context);
603
        }
604
    }
605
    av_free(rt->rtsp_streams);
606
    if (rt->asf_ctx) {
607
        av_close_input_stream (rt->asf_ctx);
608
        rt->asf_ctx = NULL;
609
    }
610
    av_freep(&rt->auth_b64);
611
}
612

    
613
static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st, URLContext *handle) {
614
    AVFormatContext *rtpctx;
615
    int ret;
616
    AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
617

    
618
    if (!rtp_format)
619
        return NULL;
620

    
621
    /* Allocate an AVFormatContext for each output stream */
622
    rtpctx = avformat_alloc_context();
623
    if (!rtpctx)
624
        return NULL;
625

    
626
    rtpctx->oformat = rtp_format;
627
    if (!av_new_stream(rtpctx, 0)) {
628
        av_free(rtpctx);
629
        return NULL;
630
    }
631
    /* Copy the max delay setting; the rtp muxer reads this. */
632
    rtpctx->max_delay = s->max_delay;
633
    /* Copy other stream parameters. */
634
    rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
635

    
636
    /* Remove the local codec, link to the original codec
637
     * context instead, to give the rtp muxer access to
638
     * codec parameters. */
639
    av_free(rtpctx->streams[0]->codec);
640
    rtpctx->streams[0]->codec = st->codec;
641

    
642
    url_fdopen(&rtpctx->pb, handle);
643
    ret = av_write_header(rtpctx);
644

    
645
    if (ret) {
646
        url_fclose(rtpctx->pb);
647
        av_free(rtpctx->streams[0]);
648
        av_free(rtpctx);
649
        return NULL;
650
    }
651

    
652
    /* Copy the RTP AVStream timebase back to the original AVStream */
653
    st->time_base = rtpctx->streams[0]->time_base;
654
    return rtpctx;
655
}
656

    
657
static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
658
{
659
    RTSPState *rt = s->priv_data;
660
    AVStream *st = NULL;
661

    
662
    /* open the RTP context */
663
    if (rtsp_st->stream_index >= 0)
664
        st = s->streams[rtsp_st->stream_index];
665
    if (!st)
666
        s->ctx_flags |= AVFMTCTX_NOHEADER;
667

    
668
    if (s->oformat) {
669
        rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
670
        /* Ownage of rtp_handle is passed to the rtp mux context */
671
        rtsp_st->rtp_handle = NULL;
672
    } else if (rt->transport == RTSP_TRANSPORT_RDT)
673
        rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
674
                                            rtsp_st->dynamic_protocol_context,
675
                                            rtsp_st->dynamic_handler);
676
    else
677
        rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
678
                                         rtsp_st->sdp_payload_type,
679
                                         &rtsp_st->rtp_payload_data);
680

    
681
    if (!rtsp_st->transport_priv) {
682
         return AVERROR(ENOMEM);
683
    } else if (rt->transport != RTSP_TRANSPORT_RDT) {
684
        if (rtsp_st->dynamic_handler) {
685
            rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
686
                                           rtsp_st->dynamic_protocol_context,
687
                                           rtsp_st->dynamic_handler);
688
        }
689
    }
690

    
691
    return 0;
692
}
693

    
694
#if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
695
static int rtsp_probe(AVProbeData *p)
696
{
697
    if (av_strstart(p->filename, "rtsp:", NULL))
698
        return AVPROBE_SCORE_MAX;
699
    return 0;
700
}
701

    
702
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
703
{
704
    const char *p;
705
    int v;
706

    
707
    p = *pp;
708
    skip_spaces(&p);
709
    v = strtol(p, (char **)&p, 10);
710
    if (*p == '-') {
711
        p++;
712
        *min_ptr = v;
713
        v = strtol(p, (char **)&p, 10);
714
        *max_ptr = v;
715
    } else {
716
        *min_ptr = v;
717
        *max_ptr = v;
718
    }
719
    *pp = p;
720
}
721

    
722
/* XXX: only one transport specification is parsed */
723
static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
724
{
725
    char transport_protocol[16];
726
    char profile[16];
727
    char lower_transport[16];
728
    char parameter[16];
729
    RTSPTransportField *th;
730
    char buf[256];
731

    
732
    reply->nb_transports = 0;
733

    
734
    for (;;) {
735
        skip_spaces(&p);
736
        if (*p == '\0')
737
            break;
738

    
739
        th = &reply->transports[reply->nb_transports];
740

    
741
        get_word_sep(transport_protocol, sizeof(transport_protocol),
742
                     "/", &p);
743
        if (!strcasecmp (transport_protocol, "rtp")) {
744
            get_word_sep(profile, sizeof(profile), "/;,", &p);
745
            lower_transport[0] = '\0';
746
            /* rtp/avp/<protocol> */
747
            if (*p == '/') {
748
                get_word_sep(lower_transport, sizeof(lower_transport),
749
                             ";,", &p);
750
            }
751
            th->transport = RTSP_TRANSPORT_RTP;
752
        } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
753
                   !strcasecmp (transport_protocol, "x-real-rdt")) {
754
            /* x-pn-tng/<protocol> */
755
            get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
756
            profile[0] = '\0';
757
            th->transport = RTSP_TRANSPORT_RDT;
758
        }
759
        if (!strcasecmp(lower_transport, "TCP"))
760
            th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
761
        else
762
            th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
763

    
764
        if (*p == ';')
765
            p++;
766
        /* get each parameter */
767
        while (*p != '\0' && *p != ',') {
768
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
769
            if (!strcmp(parameter, "port")) {
770
                if (*p == '=') {
771
                    p++;
772
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
773
                }
774
            } else if (!strcmp(parameter, "client_port")) {
775
                if (*p == '=') {
776
                    p++;
777
                    rtsp_parse_range(&th->client_port_min,
778
                                     &th->client_port_max, &p);
779
                }
780
            } else if (!strcmp(parameter, "server_port")) {
781
                if (*p == '=') {
782
                    p++;
783
                    rtsp_parse_range(&th->server_port_min,
784
                                     &th->server_port_max, &p);
785
                }
786
            } else if (!strcmp(parameter, "interleaved")) {
787
                if (*p == '=') {
788
                    p++;
789
                    rtsp_parse_range(&th->interleaved_min,
790
                                     &th->interleaved_max, &p);
791
                }
792
            } else if (!strcmp(parameter, "multicast")) {
793
                if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
794
                    th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
795
            } else if (!strcmp(parameter, "ttl")) {
796
                if (*p == '=') {
797
                    p++;
798
                    th->ttl = strtol(p, (char **)&p, 10);
799
                }
800
            } else if (!strcmp(parameter, "destination")) {
801
                struct in_addr ipaddr;
802

    
803
                if (*p == '=') {
804
                    p++;
805
                    get_word_sep(buf, sizeof(buf), ";,", &p);
806
                    if (inet_aton(buf, &ipaddr))
807
                        th->destination = ntohl(ipaddr.s_addr);
808
                }
809
            }
810
            while (*p != ';' && *p != '\0' && *p != ',')
811
                p++;
812
            if (*p == ';')
813
                p++;
814
        }
815
        if (*p == ',')
816
            p++;
817

    
818
        reply->nb_transports++;
819
    }
820
}
821

    
822
void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
823
{
824
    const char *p;
825

    
826
    /* NOTE: we do case independent match for broken servers */
827
    p = buf;
828
    if (av_stristart(p, "Session:", &p)) {
829
        int t;
830
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
831
        if (av_stristart(p, ";timeout=", &p) &&
832
            (t = strtol(p, NULL, 10)) > 0) {
833
            reply->timeout = t;
834
        }
835
    } else if (av_stristart(p, "Content-Length:", &p)) {
836
        reply->content_length = strtol(p, NULL, 10);
837
    } else if (av_stristart(p, "Transport:", &p)) {
838
        rtsp_parse_transport(reply, p);
839
    } else if (av_stristart(p, "CSeq:", &p)) {
840
        reply->seq = strtol(p, NULL, 10);
841
    } else if (av_stristart(p, "Range:", &p)) {
842
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
843
    } else if (av_stristart(p, "RealChallenge1:", &p)) {
844
        skip_spaces(&p);
845
        av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
846
    } else if (av_stristart(p, "Server:", &p)) {
847
        skip_spaces(&p);
848
        av_strlcpy(reply->server, p, sizeof(reply->server));
849
    } else if (av_stristart(p, "Notice:", &p) ||
850
               av_stristart(p, "X-Notice:", &p)) {
851
        reply->notice = strtol(p, NULL, 10);
852
    } else if (av_stristart(p, "Location:", &p)) {
853
        skip_spaces(&p);
854
        av_strlcpy(reply->location, p , sizeof(reply->location));
855
    }
856
}
857

    
858
/* skip a RTP/TCP interleaved packet */
859
static void rtsp_skip_packet(AVFormatContext *s)
860
{
861
    RTSPState *rt = s->priv_data;
862
    int ret, len, len1;
863
    uint8_t buf[1024];
864

    
865
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
866
    if (ret != 3)
867
        return;
868
    len = AV_RB16(buf + 1);
869

    
870
    dprintf(s, "skipping RTP packet len=%d\n", len);
871

    
872
    /* skip payload */
873
    while (len > 0) {
874
        len1 = len;
875
        if (len1 > sizeof(buf))
876
            len1 = sizeof(buf);
877
        ret = url_read_complete(rt->rtsp_hd, buf, len1);
878
        if (ret != len1)
879
            return;
880
        len -= len1;
881
    }
882
}
883

    
884
int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
885
                       unsigned char **content_ptr,
886
                       int return_on_interleaved_data)
887
{
888
    RTSPState *rt = s->priv_data;
889
    char buf[4096], buf1[1024], *q;
890
    unsigned char ch;
891
    const char *p;
892
    int ret, content_length, line_count = 0;
893
    unsigned char *content = NULL;
894

    
895
    memset(reply, 0, sizeof(*reply));
896

    
897
    /* parse reply (XXX: use buffers) */
898
    rt->last_reply[0] = '\0';
899
    for (;;) {
900
        q = buf;
901
        for (;;) {
902
            ret = url_read_complete(rt->rtsp_hd, &ch, 1);
903
#ifdef DEBUG_RTP_TCP
904
            dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
905
#endif
906
            if (ret != 1)
907
                return -1;
908
            if (ch == '\n')
909
                break;
910
            if (ch == '$') {
911
                /* XXX: only parse it if first char on line ? */
912
                if (return_on_interleaved_data) {
913
                    return 1;
914
                } else
915
                rtsp_skip_packet(s);
916
            } else if (ch != '\r') {
917
                if ((q - buf) < sizeof(buf) - 1)
918
                    *q++ = ch;
919
            }
920
        }
921
        *q = '\0';
922

    
923
        dprintf(s, "line='%s'\n", buf);
924

    
925
        /* test if last line */
926
        if (buf[0] == '\0')
927
            break;
928
        p = buf;
929
        if (line_count == 0) {
930
            /* get reply code */
931
            get_word(buf1, sizeof(buf1), &p);
932
            get_word(buf1, sizeof(buf1), &p);
933
            reply->status_code = atoi(buf1);
934
        } else {
935
            ff_rtsp_parse_line(reply, p);
936
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
937
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
938
        }
939
        line_count++;
940
    }
941

    
942
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
943
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
944

    
945
    content_length = reply->content_length;
946
    if (content_length > 0) {
947
        /* leave some room for a trailing '\0' (useful for simple parsing) */
948
        content = av_malloc(content_length + 1);
949
        (void)url_read_complete(rt->rtsp_hd, content, content_length);
950
        content[content_length] = '\0';
951
    }
952
    if (content_ptr)
953
        *content_ptr = content;
954
    else
955
        av_free(content);
956

    
957
    /* EOS */
958
    if (reply->notice == 2101 /* End-of-Stream Reached */      ||
959
        reply->notice == 2104 /* Start-of-Stream Reached */    ||
960
        reply->notice == 2306 /* Continuous Feed Terminated */) {
961
        rt->state = RTSP_STATE_IDLE;
962
    } else if (reply->notice >= 4400 && reply->notice < 5500) {
963
        return AVERROR(EIO); /* data or server error */
964
    } else if (reply->notice == 2401 /* Ticket Expired */ ||
965
             (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
966
        return AVERROR(EPERM);
967

    
968
    return 0;
969
}
970

    
971
void ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
972
                                         const char *cmd,
973
                                         const unsigned char *send_content,
974
                                         int send_content_length)
975
{
976
    RTSPState *rt = s->priv_data;
977
    char buf[4096], buf1[1024];
978

    
979
    rt->seq++;
980
    av_strlcpy(buf, cmd, sizeof(buf));
981
    snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
982
    av_strlcat(buf, buf1, sizeof(buf));
983
    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
984
        snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
985
        av_strlcat(buf, buf1, sizeof(buf));
986
    }
987
    if (rt->auth_b64)
988
        av_strlcatf(buf, sizeof(buf),
989
                    "Authorization: Basic %s\r\n",
990
                    rt->auth_b64);
991
    if (send_content_length > 0 && send_content)
992
        av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
993
    av_strlcat(buf, "\r\n", sizeof(buf));
994

    
995
    dprintf(s, "Sending:\n%s--\n", buf);
996

    
997
    url_write(rt->rtsp_hd, buf, strlen(buf));
998
    if (send_content_length > 0 && send_content)
999
        url_write(rt->rtsp_hd, send_content, send_content_length);
1000
    rt->last_cmd_time = av_gettime();
1001
}
1002

    
1003
void ff_rtsp_send_cmd_async(AVFormatContext *s, const char *cmd)
1004
{
1005
    ff_rtsp_send_cmd_with_content_async(s, cmd, NULL, 0);
1006
}
1007

    
1008
void ff_rtsp_send_cmd(AVFormatContext *s,
1009
                      const char *cmd, RTSPMessageHeader *reply,
1010
                      unsigned char **content_ptr)
1011
{
1012
    ff_rtsp_send_cmd_async(s, cmd);
1013

    
1014
    ff_rtsp_read_reply(s, reply, content_ptr, 0);
1015
}
1016

    
1017
void ff_rtsp_send_cmd_with_content(AVFormatContext *s,
1018
                                const char *cmd,
1019
                                RTSPMessageHeader *reply,
1020
                                unsigned char **content_ptr,
1021
                                const unsigned char *send_content,
1022
                                int send_content_length)
1023
{
1024
    ff_rtsp_send_cmd_with_content_async(s, cmd, send_content, send_content_length);
1025

    
1026
    ff_rtsp_read_reply(s, reply, content_ptr, 0);
1027
}
1028

    
1029
/**
1030
 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
1031
 */
1032
static int make_setup_request(AVFormatContext *s, const char *host, int port,
1033
                              int lower_transport, const char *real_challenge)
1034
{
1035
    RTSPState *rt = s->priv_data;
1036
    int rtx, j, i, err, interleave = 0;
1037
    RTSPStream *rtsp_st;
1038
    RTSPMessageHeader reply1, *reply = &reply1;
1039
    char cmd[2048];
1040
    const char *trans_pref;
1041

    
1042
    if (rt->transport == RTSP_TRANSPORT_RDT)
1043
        trans_pref = "x-pn-tng";
1044
    else
1045
        trans_pref = "RTP/AVP";
1046

    
1047
    /* default timeout: 1 minute */
1048
    rt->timeout = 60;
1049

    
1050
    /* for each stream, make the setup request */
1051
    /* XXX: we assume the same server is used for the control of each
1052
     * RTSP stream */
1053

    
1054
    for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1055
        char transport[2048];
1056

    
1057
        /**
1058
         * WMS serves all UDP data over a single connection, the RTX, which
1059
         * isn't necessarily the first in the SDP but has to be the first
1060
         * to be set up, else the second/third SETUP will fail with a 461.
1061
         */
1062
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1063
             rt->server_type == RTSP_SERVER_WMS) {
1064
            if (i == 0) {
1065
                /* rtx first */
1066
                for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1067
                    int len = strlen(rt->rtsp_streams[rtx]->control_url);
1068
                    if (len >= 4 &&
1069
                        !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1070
                                "/rtx"))
1071
                        break;
1072
                }
1073
                if (rtx == rt->nb_rtsp_streams)
1074
                    return -1; /* no RTX found */
1075
                rtsp_st = rt->rtsp_streams[rtx];
1076
            } else
1077
                rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1078
        } else
1079
            rtsp_st = rt->rtsp_streams[i];
1080

    
1081
        /* RTP/UDP */
1082
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1083
            char buf[256];
1084

    
1085
            if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1086
                port = reply->transports[0].client_port_min;
1087
                goto have_port;
1088
            }
1089

    
1090
            /* first try in specified port range */
1091
            if (RTSP_RTP_PORT_MIN != 0) {
1092
                while (j <= RTSP_RTP_PORT_MAX) {
1093
                    snprintf(buf, sizeof(buf), "rtp://%s?localport=%d",
1094
                             host, j);
1095
                    /* we will use two ports per rtp stream (rtp and rtcp) */
1096
                    j += 2;
1097
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1098
                        goto rtp_opened;
1099
                }
1100
            }
1101

    
1102
#if 0
1103
            /* then try on any port */
1104
            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1105
                err = AVERROR_INVALIDDATA;
1106
                goto fail;
1107
            }
1108
#endif
1109

    
1110
        rtp_opened:
1111
            port = rtp_get_local_port(rtsp_st->rtp_handle);
1112
        have_port:
1113
            snprintf(transport, sizeof(transport) - 1,
1114
                     "%s/UDP;", trans_pref);
1115
            if (rt->server_type != RTSP_SERVER_REAL)
1116
                av_strlcat(transport, "unicast;", sizeof(transport));
1117
            av_strlcatf(transport, sizeof(transport),
1118
                     "client_port=%d", port);
1119
            if (rt->transport == RTSP_TRANSPORT_RTP &&
1120
                !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1121
                av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1122
        }
1123

    
1124
        /* RTP/TCP */
1125
        else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1126
            /** For WMS streams, the application streams are only used for
1127
             * UDP. When trying to set it up for TCP streams, the server
1128
             * will return an error. Therefore, we skip those streams. */
1129
            if (rt->server_type == RTSP_SERVER_WMS &&
1130
                s->streams[rtsp_st->stream_index]->codec->codec_type ==
1131
                    CODEC_TYPE_DATA)
1132
                continue;
1133
            snprintf(transport, sizeof(transport) - 1,
1134
                     "%s/TCP;", trans_pref);
1135
            if (rt->server_type == RTSP_SERVER_WMS)
1136
                av_strlcat(transport, "unicast;", sizeof(transport));
1137
            av_strlcatf(transport, sizeof(transport),
1138
                        "interleaved=%d-%d",
1139
                        interleave, interleave + 1);
1140
            interleave += 2;
1141
        }
1142

    
1143
        else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1144
            snprintf(transport, sizeof(transport) - 1,
1145
                     "%s/UDP;multicast", trans_pref);
1146
        }
1147
        if (s->oformat) {
1148
            av_strlcat(transport, ";mode=receive", sizeof(transport));
1149
        } else if (rt->server_type == RTSP_SERVER_REAL ||
1150
                   rt->server_type == RTSP_SERVER_WMS)
1151
            av_strlcat(transport, ";mode=play", sizeof(transport));
1152
        snprintf(cmd, sizeof(cmd),
1153
                 "SETUP %s RTSP/1.0\r\n"
1154
                 "Transport: %s\r\n",
1155
                 rtsp_st->control_url, transport);
1156
        if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1157
            char real_res[41], real_csum[9];
1158
            ff_rdt_calc_response_and_checksum(real_res, real_csum,
1159
                                              real_challenge);
1160
            av_strlcatf(cmd, sizeof(cmd),
1161
                        "If-Match: %s\r\n"
1162
                        "RealChallenge2: %s, sd=%s\r\n",
1163
                        rt->session_id, real_res, real_csum);
1164
        }
1165
        ff_rtsp_send_cmd(s, cmd, reply, NULL);
1166
        if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1167
            err = 1;
1168
            goto fail;
1169
        } else if (reply->status_code != RTSP_STATUS_OK ||
1170
                   reply->nb_transports != 1) {
1171
            err = AVERROR_INVALIDDATA;
1172
            goto fail;
1173
        }
1174

    
1175
        /* XXX: same protocol for all streams is required */
1176
        if (i > 0) {
1177
            if (reply->transports[0].lower_transport != rt->lower_transport ||
1178
                reply->transports[0].transport != rt->transport) {
1179
                err = AVERROR_INVALIDDATA;
1180
                goto fail;
1181
            }
1182
        } else {
1183
            rt->lower_transport = reply->transports[0].lower_transport;
1184
            rt->transport = reply->transports[0].transport;
1185
        }
1186

    
1187
        /* close RTP connection if not choosen */
1188
        if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1189
            (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1190
            url_close(rtsp_st->rtp_handle);
1191
            rtsp_st->rtp_handle = NULL;
1192
        }
1193

    
1194
        switch(reply->transports[0].lower_transport) {
1195
        case RTSP_LOWER_TRANSPORT_TCP:
1196
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1197
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1198
            break;
1199

    
1200
        case RTSP_LOWER_TRANSPORT_UDP: {
1201
            char url[1024];
1202

    
1203
            /* XXX: also use address if specified */
1204
            snprintf(url, sizeof(url), "rtp://%s:%d",
1205
                     host, reply->transports[0].server_port_min);
1206
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1207
                rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1208
                err = AVERROR_INVALIDDATA;
1209
                goto fail;
1210
            }
1211
            /* Try to initialize the connection state in a
1212
             * potential NAT router by sending dummy packets.
1213
             * RTP/RTCP dummy packets are used for RDT, too.
1214
             */
1215
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1216
                rtp_send_punch_packets(rtsp_st->rtp_handle);
1217
            break;
1218
        }
1219
        case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1220
            char url[1024];
1221
            struct in_addr in;
1222
            int port, ttl;
1223

    
1224
            if (reply->transports[0].destination) {
1225
                in.s_addr = htonl(reply->transports[0].destination);
1226
                port      = reply->transports[0].port_min;
1227
                ttl       = reply->transports[0].ttl;
1228
            } else {
1229
                in        = rtsp_st->sdp_ip;
1230
                port      = rtsp_st->sdp_port;
1231
                ttl       = rtsp_st->sdp_ttl;
1232
            }
1233
            snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1234
                     inet_ntoa(in), port, ttl);
1235
            if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1236
                err = AVERROR_INVALIDDATA;
1237
                goto fail;
1238
            }
1239
            break;
1240
        }
1241
        }
1242

    
1243
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1244
            goto fail;
1245
    }
1246

    
1247
    if (reply->timeout > 0)
1248
        rt->timeout = reply->timeout;
1249

    
1250
    if (rt->server_type == RTSP_SERVER_REAL)
1251
        rt->need_subscription = 1;
1252

    
1253
    return 0;
1254

    
1255
fail:
1256
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1257
        if (rt->rtsp_streams[i]->rtp_handle) {
1258
            url_close(rt->rtsp_streams[i]->rtp_handle);
1259
            rt->rtsp_streams[i]->rtp_handle = NULL;
1260
        }
1261
    }
1262
    return err;
1263
}
1264

    
1265
static int rtsp_read_play(AVFormatContext *s)
1266
{
1267
    RTSPState *rt = s->priv_data;
1268
    RTSPMessageHeader reply1, *reply = &reply1;
1269
    char cmd[1024];
1270

    
1271
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1272

    
1273
    if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1274
        if (rt->state == RTSP_STATE_PAUSED) {
1275
            snprintf(cmd, sizeof(cmd),
1276
                     "PLAY %s RTSP/1.0\r\n",
1277
                     rt->control_uri);
1278
        } else {
1279
            snprintf(cmd, sizeof(cmd),
1280
                     "PLAY %s RTSP/1.0\r\n"
1281
                     "Range: npt=%0.3f-\r\n",
1282
                     rt->control_uri,
1283
                     (double)rt->seek_timestamp / AV_TIME_BASE);
1284
        }
1285
        ff_rtsp_send_cmd(s, cmd, reply, NULL);
1286
        if (reply->status_code != RTSP_STATUS_OK) {
1287
            return -1;
1288
        }
1289
    }
1290
    rt->state = RTSP_STATE_STREAMING;
1291
    return 0;
1292
}
1293

    
1294
static int rtsp_setup_input_streams(AVFormatContext *s)
1295
{
1296
    RTSPState *rt = s->priv_data;
1297
    RTSPMessageHeader reply1, *reply = &reply1;
1298
    char cmd[1024];
1299
    unsigned char *content = NULL;
1300
    int ret;
1301

    
1302
    /* describe the stream */
1303
    snprintf(cmd, sizeof(cmd),
1304
             "DESCRIBE %s RTSP/1.0\r\n"
1305
             "Accept: application/sdp\r\n",
1306
             s->filename);
1307
    if (rt->server_type == RTSP_SERVER_REAL) {
1308
        /**
1309
         * The Require: attribute is needed for proper streaming from
1310
         * Realmedia servers.
1311
         */
1312
        av_strlcat(cmd,
1313
                   "Require: com.real.retain-entity-for-setup\r\n",
1314
                   sizeof(cmd));
1315
    }
1316
    ff_rtsp_send_cmd(s, cmd, reply, &content);
1317
    if (!content)
1318
        return AVERROR_INVALIDDATA;
1319
    if (reply->status_code != RTSP_STATUS_OK) {
1320
        av_freep(&content);
1321
        return AVERROR_INVALIDDATA;
1322
    }
1323

    
1324
    /* now we got the SDP description, we parse it */
1325
    ret = sdp_parse(s, (const char *)content);
1326
    av_freep(&content);
1327
    if (ret < 0)
1328
        return AVERROR_INVALIDDATA;
1329

    
1330
    return 0;
1331
}
1332

    
1333
static int rtsp_setup_output_streams(AVFormatContext *s)
1334
{
1335
    RTSPState *rt = s->priv_data;
1336
    RTSPMessageHeader reply1, *reply = &reply1;
1337
    char cmd[1024];
1338
    int i;
1339
    char *sdp;
1340

    
1341
    /* Announce the stream */
1342
    snprintf(cmd, sizeof(cmd),
1343
             "ANNOUNCE %s RTSP/1.0\r\n"
1344
             "Content-Type: application/sdp\r\n",
1345
             s->filename);
1346
    sdp = av_mallocz(8192);
1347
    if (sdp == NULL)
1348
        return AVERROR(ENOMEM);
1349
    if (avf_sdp_create(&s, 1, sdp, 8192)) {
1350
        av_free(sdp);
1351
        return AVERROR_INVALIDDATA;
1352
    }
1353
    av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
1354
    ff_rtsp_send_cmd_with_content(s, cmd, reply, NULL, sdp, strlen(sdp));
1355
    av_free(sdp);
1356
    if (reply->status_code != RTSP_STATUS_OK)
1357
        return AVERROR_INVALIDDATA;
1358

    
1359
    /* Set up the RTSPStreams for each AVStream */
1360
    for (i = 0; i < s->nb_streams; i++) {
1361
        RTSPStream *rtsp_st;
1362
        AVStream *st = s->streams[i];
1363

    
1364
        rtsp_st = av_mallocz(sizeof(RTSPStream));
1365
        if (!rtsp_st)
1366
            return AVERROR(ENOMEM);
1367
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
1368

    
1369
        st->priv_data = rtsp_st;
1370
        rtsp_st->stream_index = i;
1371

    
1372
        av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
1373
        /* Note, this must match the relative uri set in the sdp content */
1374
        av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
1375
                    "/streamid=%d", i);
1376
    }
1377

    
1378
    return 0;
1379
}
1380

    
1381
int ff_rtsp_connect(AVFormatContext *s)
1382
{
1383
    RTSPState *rt = s->priv_data;
1384
    char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1385
    char *option_list, *option, *filename;
1386
    URLContext *rtsp_hd;
1387
    int port, err;
1388
    RTSPMessageHeader reply1, *reply = &reply1;
1389
    int lower_transport_mask = 0;
1390
    char real_challenge[64];
1391
redirect:
1392
    /* extract hostname and port */
1393
    url_split(NULL, 0, auth, sizeof(auth),
1394
              host, sizeof(host), &port, path, sizeof(path), s->filename);
1395
    if (*auth) {
1396
        int auth_len = strlen(auth), b64_len = ((auth_len + 2) / 3) * 4 + 1;
1397

    
1398
        if (!(rt->auth_b64 = av_malloc(b64_len)))
1399
            return AVERROR(ENOMEM);
1400
        if (!av_base64_encode(rt->auth_b64, b64_len, auth, auth_len)) {
1401
            err = AVERROR(EINVAL);
1402
            goto fail;
1403
        }
1404
    }
1405
    if (port < 0)
1406
        port = RTSP_DEFAULT_PORT;
1407

    
1408
    /* search for options */
1409
    option_list = strchr(path, '?');
1410
    if (option_list) {
1411
        filename = strchr(s->filename, '?');
1412
        while (option_list) {
1413
            /* move the option pointer */
1414
            option = ++option_list;
1415
            option_list = strchr(option_list, '&');
1416
            if (option_list)
1417
                *option_list = 0;
1418

    
1419
            /* handle the options */
1420
            if (!strcmp(option, "udp")) {
1421
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1422
            } else if (!strcmp(option, "multicast")) {
1423
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1424
            } else if (!strcmp(option, "tcp")) {
1425
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1426
            } else {
1427
                strcpy(++filename, option);
1428
                filename += strlen(option);
1429
                if (option_list) *filename = '&';
1430
            }
1431
        }
1432
        *filename = 0;
1433
    }
1434

    
1435
    if (!lower_transport_mask)
1436
        lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1437

    
1438
    if (s->oformat) {
1439
        /* Only UDP output is supported at the moment. */
1440
        lower_transport_mask &= 1 << RTSP_LOWER_TRANSPORT_UDP;
1441
        if (!lower_transport_mask) {
1442
            av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1443
                                    "only UDP is supported for output.\n");
1444
            err = AVERROR(EINVAL);
1445
            goto fail;
1446
        }
1447
    }
1448

    
1449
    /* open the tcp connexion */
1450
    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1451
    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0) {
1452
        err = AVERROR(EIO);
1453
        goto fail;
1454
    }
1455
    rt->rtsp_hd = rtsp_hd;
1456
    rt->seq = 0;
1457

    
1458
    /* request options supported by the server; this also detects server
1459
     * type */
1460
    av_strlcpy(rt->control_uri, s->filename,
1461
               sizeof(rt->control_uri));
1462
    for (rt->server_type = RTSP_SERVER_RTP;;) {
1463
        snprintf(cmd, sizeof(cmd),
1464
                 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1465
        if (rt->server_type == RTSP_SERVER_REAL)
1466
            av_strlcat(cmd,
1467
                       /**
1468
                        * The following entries are required for proper
1469
                        * streaming from a Realmedia server. They are
1470
                        * interdependent in some way although we currently
1471
                        * don't quite understand how. Values were copied
1472
                        * from mplayer SVN r23589.
1473
                        * @param CompanyID is a 16-byte ID in base64
1474
                        * @param ClientChallenge is a 16-byte ID in hex
1475
                        */
1476
                       "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1477
                       "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1478
                       "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1479
                       "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1480
                       sizeof(cmd));
1481
        ff_rtsp_send_cmd(s, cmd, reply, NULL);
1482
        if (reply->status_code != RTSP_STATUS_OK) {
1483
            err = AVERROR_INVALIDDATA;
1484
            goto fail;
1485
        }
1486

    
1487
        /* detect server type if not standard-compliant RTP */
1488
        if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1489
            rt->server_type = RTSP_SERVER_REAL;
1490
            continue;
1491
        } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1492
            rt->server_type = RTSP_SERVER_WMS;
1493
        } else if (rt->server_type == RTSP_SERVER_REAL)
1494
            strcpy(real_challenge, reply->real_challenge);
1495
        break;
1496
    }
1497

    
1498
    if (s->iformat)
1499
        err = rtsp_setup_input_streams(s);
1500
    else
1501
        err = rtsp_setup_output_streams(s);
1502
    if (err)
1503
        goto fail;
1504

    
1505
    do {
1506
        int lower_transport = ff_log2_tab[lower_transport_mask &
1507
                                  ~(lower_transport_mask - 1)];
1508

    
1509
        err = make_setup_request(s, host, port, lower_transport,
1510
                                 rt->server_type == RTSP_SERVER_REAL ?
1511
                                     real_challenge : NULL);
1512
        if (err < 0)
1513
            goto fail;
1514
        lower_transport_mask &= ~(1 << lower_transport);
1515
        if (lower_transport_mask == 0 && err == 1) {
1516
            err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1517
            goto fail;
1518
        }
1519
    } while (err);
1520

    
1521
    rt->state = RTSP_STATE_IDLE;
1522
    rt->seek_timestamp = 0; /* default is to start stream at position zero */
1523
    return 0;
1524
 fail:
1525
    ff_rtsp_close_streams(s);
1526
    url_close(rt->rtsp_hd);
1527
    if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1528
        av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1529
        av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1530
               reply->status_code,
1531
               s->filename);
1532
        goto redirect;
1533
    }
1534
    return err;
1535
}
1536
#endif
1537

    
1538
#if CONFIG_RTSP_DEMUXER
1539
static int rtsp_read_header(AVFormatContext *s,
1540
                            AVFormatParameters *ap)
1541
{
1542
    RTSPState *rt = s->priv_data;
1543
    int ret;
1544

    
1545
    ret = ff_rtsp_connect(s);
1546
    if (ret)
1547
        return ret;
1548

    
1549
    if (ap->initial_pause) {
1550
         /* do not start immediately */
1551
    } else {
1552
         if (rtsp_read_play(s) < 0) {
1553
            ff_rtsp_close_streams(s);
1554
            url_close(rt->rtsp_hd);
1555
            return AVERROR_INVALIDDATA;
1556
        }
1557
    }
1558

    
1559
    return 0;
1560
}
1561

    
1562
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1563
                           uint8_t *buf, int buf_size)
1564
{
1565
    RTSPState *rt = s->priv_data;
1566
    RTSPStream *rtsp_st;
1567
    fd_set rfds;
1568
    int fd, fd_max, n, i, ret, tcp_fd;
1569
    struct timeval tv;
1570

    
1571
    for (;;) {
1572
        if (url_interrupt_cb())
1573
            return AVERROR(EINTR);
1574
        FD_ZERO(&rfds);
1575
        if (rt->rtsp_hd) {
1576
            tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1577
            FD_SET(tcp_fd, &rfds);
1578
        } else {
1579
            fd_max = 0;
1580
            tcp_fd = -1;
1581
        }
1582
        for (i = 0; i < rt->nb_rtsp_streams; i++) {
1583
            rtsp_st = rt->rtsp_streams[i];
1584
            if (rtsp_st->rtp_handle) {
1585
                /* currently, we cannot probe RTCP handle because of
1586
                 * blocking restrictions */
1587
                fd = url_get_file_handle(rtsp_st->rtp_handle);
1588
                if (fd > fd_max)
1589
                    fd_max = fd;
1590
                FD_SET(fd, &rfds);
1591
            }
1592
        }
1593
        tv.tv_sec = 0;
1594
        tv.tv_usec = 100 * 1000;
1595
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1596
        if (n > 0) {
1597
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1598
                rtsp_st = rt->rtsp_streams[i];
1599
                if (rtsp_st->rtp_handle) {
1600
                    fd = url_get_file_handle(rtsp_st->rtp_handle);
1601
                    if (FD_ISSET(fd, &rfds)) {
1602
                        ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1603
                        if (ret > 0) {
1604
                            *prtsp_st = rtsp_st;
1605
                            return ret;
1606
                        }
1607
                    }
1608
                }
1609
            }
1610
#if CONFIG_RTSP_DEMUXER
1611
            if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1612
                RTSPMessageHeader reply;
1613

    
1614
                ff_rtsp_read_reply(s, &reply, NULL, 0);
1615
                /* XXX: parse message */
1616
                if (rt->state != RTSP_STATE_STREAMING)
1617
                    return 0;
1618
            }
1619
#endif
1620
        }
1621
    }
1622
}
1623

    
1624
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1625
                           uint8_t *buf, int buf_size)
1626
{
1627
    RTSPState *rt = s->priv_data;
1628
    int id, len, i, ret;
1629
    RTSPStream *rtsp_st;
1630

    
1631
#ifdef DEBUG_RTP_TCP
1632
    dprintf(s, "tcp_read_packet:\n");
1633
#endif
1634
redo:
1635
    for (;;) {
1636
        RTSPMessageHeader reply;
1637

    
1638
        ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
1639
        if (ret == -1)
1640
            return -1;
1641
        if (ret == 1) /* received '$' */
1642
            break;
1643
        /* XXX: parse message */
1644
        if (rt->state != RTSP_STATE_STREAMING)
1645
            return 0;
1646
    }
1647
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
1648
    if (ret != 3)
1649
        return -1;
1650
    id  = buf[0];
1651
    len = AV_RB16(buf + 1);
1652
#ifdef DEBUG_RTP_TCP
1653
    dprintf(s, "id=%d len=%d\n", id, len);
1654
#endif
1655
    if (len > buf_size || len < 12)
1656
        goto redo;
1657
    /* get the data */
1658
    ret = url_read_complete(rt->rtsp_hd, buf, len);
1659
    if (ret != len)
1660
        return -1;
1661
    if (rt->transport == RTSP_TRANSPORT_RDT &&
1662
        ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1663
        return -1;
1664

    
1665
    /* find the matching stream */
1666
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1667
        rtsp_st = rt->rtsp_streams[i];
1668
        if (id >= rtsp_st->interleaved_min &&
1669
            id <= rtsp_st->interleaved_max)
1670
            goto found;
1671
    }
1672
    goto redo;
1673
found:
1674
    *prtsp_st = rtsp_st;
1675
    return len;
1676
}
1677

    
1678
static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1679
{
1680
    RTSPState *rt = s->priv_data;
1681
    int ret, len;
1682
    uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1683
    RTSPStream *rtsp_st;
1684

    
1685
    /* get next frames from the same RTP packet */
1686
    if (rt->cur_transport_priv) {
1687
        if (rt->transport == RTSP_TRANSPORT_RDT) {
1688
            ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1689
        } else
1690
            ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1691
        if (ret == 0) {
1692
            rt->cur_transport_priv = NULL;
1693
            return 0;
1694
        } else if (ret == 1) {
1695
            return 0;
1696
        } else
1697
            rt->cur_transport_priv = NULL;
1698
    }
1699

    
1700
    /* read next RTP packet */
1701
 redo:
1702
    switch(rt->lower_transport) {
1703
    default:
1704
#if CONFIG_RTSP_DEMUXER
1705
    case RTSP_LOWER_TRANSPORT_TCP:
1706
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1707
        break;
1708
#endif
1709
    case RTSP_LOWER_TRANSPORT_UDP:
1710
    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1711
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1712
        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1713
            rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1714
        break;
1715
    }
1716
    if (len < 0)
1717
        return len;
1718
    if (len == 0)
1719
        return AVERROR_EOF;
1720
    if (rt->transport == RTSP_TRANSPORT_RDT) {
1721
        ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1722
    } else
1723
        ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1724
    if (ret < 0)
1725
        goto redo;
1726
    if (ret == 1)
1727
        /* more packets may follow, so we save the RTP context */
1728
        rt->cur_transport_priv = rtsp_st->transport_priv;
1729

    
1730
    return ret;
1731
}
1732

    
1733
static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1734
{
1735
    RTSPState *rt = s->priv_data;
1736
    int ret;
1737
    RTSPMessageHeader reply1, *reply = &reply1;
1738
    char cmd[1024];
1739

    
1740
    if (rt->server_type == RTSP_SERVER_REAL) {
1741
        int i;
1742
        enum AVDiscard cache[MAX_STREAMS];
1743

    
1744
        for (i = 0; i < s->nb_streams; i++)
1745
            cache[i] = s->streams[i]->discard;
1746

    
1747
        if (!rt->need_subscription) {
1748
            if (memcmp (cache, rt->real_setup_cache,
1749
                        sizeof(enum AVDiscard) * s->nb_streams)) {
1750
                snprintf(cmd, sizeof(cmd),
1751
                         "SET_PARAMETER %s RTSP/1.0\r\n"
1752
                         "Unsubscribe: %s\r\n",
1753
                         rt->control_uri, rt->last_subscription);
1754
                ff_rtsp_send_cmd(s, cmd, reply, NULL);
1755
                if (reply->status_code != RTSP_STATUS_OK)
1756
                    return AVERROR_INVALIDDATA;
1757
                rt->need_subscription = 1;
1758
            }
1759
        }
1760

    
1761
        if (rt->need_subscription) {
1762
            int r, rule_nr, first = 1;
1763

    
1764
            memcpy(rt->real_setup_cache, cache,
1765
                   sizeof(enum AVDiscard) * s->nb_streams);
1766
            rt->last_subscription[0] = 0;
1767

    
1768
            snprintf(cmd, sizeof(cmd),
1769
                     "SET_PARAMETER %s RTSP/1.0\r\n"
1770
                     "Subscribe: ",
1771
                     rt->control_uri);
1772
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1773
                rule_nr = 0;
1774
                for (r = 0; r < s->nb_streams; r++) {
1775
                    if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1776
                        if (s->streams[r]->discard != AVDISCARD_ALL) {
1777
                            if (!first)
1778
                                av_strlcat(rt->last_subscription, ",",
1779
                                           sizeof(rt->last_subscription));
1780
                            ff_rdt_subscribe_rule(
1781
                                rt->last_subscription,
1782
                                sizeof(rt->last_subscription), i, rule_nr);
1783
                            first = 0;
1784
                        }
1785
                        rule_nr++;
1786
                    }
1787
                }
1788
            }
1789
            av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1790
            ff_rtsp_send_cmd(s, cmd, reply, NULL);
1791
            if (reply->status_code != RTSP_STATUS_OK)
1792
                return AVERROR_INVALIDDATA;
1793
            rt->need_subscription = 0;
1794

    
1795
            if (rt->state == RTSP_STATE_STREAMING)
1796
                rtsp_read_play (s);
1797
        }
1798
    }
1799

    
1800
    ret = rtsp_fetch_packet(s, pkt);
1801
    if (ret < 0)
1802
        return ret;
1803

    
1804
    /* send dummy request to keep TCP connection alive */
1805
    if ((rt->server_type == RTSP_SERVER_WMS ||
1806
         rt->server_type == RTSP_SERVER_REAL) &&
1807
        (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1808
        if (rt->server_type == RTSP_SERVER_WMS) {
1809
            snprintf(cmd, sizeof(cmd) - 1,
1810
                     "GET_PARAMETER %s RTSP/1.0\r\n",
1811
                     rt->control_uri);
1812
            ff_rtsp_send_cmd_async(s, cmd);
1813
        } else {
1814
            ff_rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n");
1815
        }
1816
    }
1817

    
1818
    return 0;
1819
}
1820

    
1821
/* pause the stream */
1822
static int rtsp_read_pause(AVFormatContext *s)
1823
{
1824
    RTSPState *rt = s->priv_data;
1825
    RTSPMessageHeader reply1, *reply = &reply1;
1826
    char cmd[1024];
1827

    
1828
    rt = s->priv_data;
1829

    
1830
    if (rt->state != RTSP_STATE_STREAMING)
1831
        return 0;
1832
    else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1833
        snprintf(cmd, sizeof(cmd),
1834
                 "PAUSE %s RTSP/1.0\r\n",
1835
                 rt->control_uri);
1836
        ff_rtsp_send_cmd(s, cmd, reply, NULL);
1837
        if (reply->status_code != RTSP_STATUS_OK) {
1838
            return -1;
1839
        }
1840
    }
1841
    rt->state = RTSP_STATE_PAUSED;
1842
    return 0;
1843
}
1844

    
1845
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1846
                          int64_t timestamp, int flags)
1847
{
1848
    RTSPState *rt = s->priv_data;
1849

    
1850
    rt->seek_timestamp = av_rescale_q(timestamp,
1851
                                      s->streams[stream_index]->time_base,
1852
                                      AV_TIME_BASE_Q);
1853
    switch(rt->state) {
1854
    default:
1855
    case RTSP_STATE_IDLE:
1856
        break;
1857
    case RTSP_STATE_STREAMING:
1858
        if (rtsp_read_pause(s) != 0)
1859
            return -1;
1860
        rt->state = RTSP_STATE_SEEKING;
1861
        if (rtsp_read_play(s) != 0)
1862
            return -1;
1863
        break;
1864
    case RTSP_STATE_PAUSED:
1865
        rt->state = RTSP_STATE_IDLE;
1866
        break;
1867
    }
1868
    return 0;
1869
}
1870

    
1871
static int rtsp_read_close(AVFormatContext *s)
1872
{
1873
    RTSPState *rt = s->priv_data;
1874
    char cmd[1024];
1875

    
1876
#if 0
1877
    /* NOTE: it is valid to flush the buffer here */
1878
    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1879
        url_fclose(&rt->rtsp_gb);
1880
    }
1881
#endif
1882
    snprintf(cmd, sizeof(cmd),
1883
             "TEARDOWN %s RTSP/1.0\r\n",
1884
             s->filename);
1885
    ff_rtsp_send_cmd_async(s, cmd);
1886

    
1887
    ff_rtsp_close_streams(s);
1888
    url_close(rt->rtsp_hd);
1889
    return 0;
1890
}
1891

    
1892
AVInputFormat rtsp_demuxer = {
1893
    "rtsp",
1894
    NULL_IF_CONFIG_SMALL("RTSP input format"),
1895
    sizeof(RTSPState),
1896
    rtsp_probe,
1897
    rtsp_read_header,
1898
    rtsp_read_packet,
1899
    rtsp_read_close,
1900
    rtsp_read_seek,
1901
    .flags = AVFMT_NOFILE,
1902
    .read_play = rtsp_read_play,
1903
    .read_pause = rtsp_read_pause,
1904
};
1905
#endif
1906

    
1907
static int sdp_probe(AVProbeData *p1)
1908
{
1909
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1910

    
1911
    /* we look for a line beginning "c=IN IP4" */
1912
    while (p < p_end && *p != '\0') {
1913
        if (p + sizeof("c=IN IP4") - 1 < p_end &&
1914
            av_strstart(p, "c=IN IP4", NULL))
1915
            return AVPROBE_SCORE_MAX / 2;
1916

    
1917
        while (p < p_end - 1 && *p != '\n') p++;
1918
        if (++p >= p_end)
1919
            break;
1920
        if (*p == '\r')
1921
            p++;
1922
    }
1923
    return 0;
1924
}
1925

    
1926
#define SDP_MAX_SIZE 8192
1927

    
1928
static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
1929
{
1930
    RTSPState *rt = s->priv_data;
1931
    RTSPStream *rtsp_st;
1932
    int size, i, err;
1933
    char *content;
1934
    char url[1024];
1935

    
1936
    /* read the whole sdp file */
1937
    /* XXX: better loading */
1938
    content = av_malloc(SDP_MAX_SIZE);
1939
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1940
    if (size <= 0) {
1941
        av_free(content);
1942
        return AVERROR_INVALIDDATA;
1943
    }
1944
    content[size] ='\0';
1945

    
1946
    sdp_parse(s, content);
1947
    av_free(content);
1948

    
1949
    /* open each RTP stream */
1950
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1951
        rtsp_st = rt->rtsp_streams[i];
1952

    
1953
        snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1954
                 inet_ntoa(rtsp_st->sdp_ip),
1955
                 rtsp_st->sdp_port,
1956
                 rtsp_st->sdp_port,
1957
                 rtsp_st->sdp_ttl);
1958
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1959
            err = AVERROR_INVALIDDATA;
1960
            goto fail;
1961
        }
1962
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1963
            goto fail;
1964
    }
1965
    return 0;
1966
fail:
1967
    ff_rtsp_close_streams(s);
1968
    return err;
1969
}
1970

    
1971
static int sdp_read_close(AVFormatContext *s)
1972
{
1973
    ff_rtsp_close_streams(s);
1974
    return 0;
1975
}
1976

    
1977
AVInputFormat sdp_demuxer = {
1978
    "sdp",
1979
    NULL_IF_CONFIG_SMALL("SDP"),
1980
    sizeof(RTSPState),
1981
    sdp_probe,
1982
    sdp_read_header,
1983
    rtsp_fetch_packet,
1984
    sdp_read_close,
1985
};