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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
#include "libavutil/base64.h"
23
#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/random_seed.h"
26
#include "avformat.h"
27

    
28
#include <sys/time.h>
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#if HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
32
#include <strings.h>
33
#include "internal.h"
34
#include "network.h"
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#include "os_support.h"
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#include "http.h"
37
#include "rtsp.h"
38

    
39
#include "rtpdec.h"
40
#include "rdt.h"
41
#include "rtpdec_asf.h"
42

    
43
//#define DEBUG
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//#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
/* Timeout values for socket select, in ms,
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 * and read_packet(), in seconds  */
52
#define SELECT_TIMEOUT_MS 100
53
#define READ_PACKET_TIMEOUT_S 10
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#define MAX_TIMEOUTS READ_PACKET_TIMEOUT_S * 1000 / SELECT_TIMEOUT_MS
55

    
56
#define SPACE_CHARS " \t\r\n"
57
/* we use memchr() instead of strchr() here because strchr() will return
58
 * the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
59
#define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
60
static void skip_spaces(const char **pp)
61
{
62
    const char *p;
63
    p = *pp;
64
    while (redir_isspace(*p))
65
        p++;
66
    *pp = p;
67
}
68

    
69
static void get_word_until_chars(char *buf, int buf_size,
70
                                 const char *sep, const char **pp)
71
{
72
    const char *p;
73
    char *q;
74

    
75
    p = *pp;
76
    skip_spaces(&p);
77
    q = buf;
78
    while (!strchr(sep, *p) && *p != '\0') {
79
        if ((q - buf) < buf_size - 1)
80
            *q++ = *p;
81
        p++;
82
    }
83
    if (buf_size > 0)
84
        *q = '\0';
85
    *pp = p;
86
}
87

    
88
static void get_word_sep(char *buf, int buf_size, const char *sep,
89
                         const char **pp)
90
{
91
    if (**pp == '/') (*pp)++;
92
    get_word_until_chars(buf, buf_size, sep, pp);
93
}
94

    
95
static void get_word(char *buf, int buf_size, const char **pp)
96
{
97
    get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
98
}
99

    
100
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
101
static int sdp_parse_rtpmap(AVFormatContext *s,
102
                            AVCodecContext *codec, RTSPStream *rtsp_st,
103
                            int payload_type, const char *p)
104
{
105
    char buf[256];
106
    int i;
107
    AVCodec *c;
108
    const char *c_name;
109

    
110
    /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
111
     * see if we can handle this kind of payload.
112
     * The space should normally not be there but some Real streams or
113
     * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
114
     * have a trailing space. */
115
    get_word_sep(buf, sizeof(buf), "/ ", &p);
116
    if (payload_type >= RTP_PT_PRIVATE) {
117
        RTPDynamicProtocolHandler *handler;
118
        for (handler = RTPFirstDynamicPayloadHandler;
119
             handler; handler = handler->next) {
120
            if (!strcasecmp(buf, handler->enc_name) &&
121
                codec->codec_type == handler->codec_type) {
122
                codec->codec_id          = handler->codec_id;
123
                rtsp_st->dynamic_handler = handler;
124
                if (handler->open)
125
                    rtsp_st->dynamic_protocol_context = handler->open();
126
                break;
127
            }
128
        }
129
    } else {
130
        /* We are in a standard case
131
         * (from http://www.iana.org/assignments/rtp-parameters). */
132
        /* search into AVRtpPayloadTypes[] */
133
        codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
134
    }
135

    
136
    c = avcodec_find_decoder(codec->codec_id);
137
    if (c && c->name)
138
        c_name = c->name;
139
    else
140
        c_name = "(null)";
141

    
142
    get_word_sep(buf, sizeof(buf), "/", &p);
143
    i = atoi(buf);
144
    switch (codec->codec_type) {
145
    case AVMEDIA_TYPE_AUDIO:
146
        av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
147
        codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
148
        codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
149
        if (i > 0) {
150
            codec->sample_rate = i;
151
            get_word_sep(buf, sizeof(buf), "/", &p);
152
            i = atoi(buf);
153
            if (i > 0)
154
                codec->channels = i;
155
            // TODO: there is a bug here; if it is a mono stream, and
156
            // less than 22000Hz, faad upconverts to stereo and twice
157
            // the frequency.  No problem, but the sample rate is being
158
            // set here by the sdp line. Patch on its way. (rdm)
159
        }
160
        av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
161
               codec->sample_rate);
162
        av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
163
               codec->channels);
164
        break;
165
    case AVMEDIA_TYPE_VIDEO:
166
        av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
167
        break;
168
    default:
169
        break;
170
    }
171
    return 0;
172
}
173

    
174
/* return the length and optionally the data */
175
static int hex_to_data(uint8_t *data, const char *p)
176
{
177
    int c, len, v;
178

    
179
    len = 0;
180
    v = 1;
181
    for (;;) {
182
        skip_spaces(&p);
183
        if (*p == '\0')
184
            break;
185
        c = toupper((unsigned char) *p++);
186
        if (c >= '0' && c <= '9')
187
            c = c - '0';
188
        else if (c >= 'A' && c <= 'F')
189
            c = c - 'A' + 10;
190
        else
191
            break;
192
        v = (v << 4) | c;
193
        if (v & 0x100) {
194
            if (data)
195
                data[len] = v;
196
            len++;
197
            v = 1;
198
        }
199
    }
200
    return len;
201
}
202

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

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

    
233
/* All known fmtp parameters and the corresponding RTPAttrTypeEnum */
234
#define ATTR_NAME_TYPE_INT 0
235
#define ATTR_NAME_TYPE_STR 1
236
static const AttrNameMap attr_names[]=
237
{
238
    { "SizeLength",       ATTR_NAME_TYPE_INT,
239
      offsetof(RTPPayloadData, sizelength) },
240
    { "IndexLength",      ATTR_NAME_TYPE_INT,
241
      offsetof(RTPPayloadData, indexlength) },
242
    { "IndexDeltaLength", ATTR_NAME_TYPE_INT,
243
      offsetof(RTPPayloadData, indexdeltalength) },
244
    { "profile-level-id", ATTR_NAME_TYPE_INT,
245
      offsetof(RTPPayloadData, profile_level_id) },
246
    { "StreamType",       ATTR_NAME_TYPE_INT,
247
      offsetof(RTPPayloadData, streamtype) },
248
    { "mode",             ATTR_NAME_TYPE_STR,
249
      offsetof(RTPPayloadData, mode) },
250
    { NULL, -1, -1 },
251
};
252

    
253
/* parse the attribute line from the fmtp a line of an sdp response. This
254
 * is broken out as a function because it is used in rtp_h264.c, which is
255
 * forthcoming. */
256
int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
257
                                char *value, int value_size)
258
{
259
    skip_spaces(p);
260
    if (**p) {
261
        get_word_sep(attr, attr_size, "=", p);
262
        if (**p == '=')
263
            (*p)++;
264
        get_word_sep(value, value_size, ";", p);
265
        if (**p == ';')
266
            (*p)++;
267
        return 1;
268
    }
269
    return 0;
270
}
271

    
272
/* parse a SDP line and save stream attributes */
273
static void sdp_parse_fmtp(AVStream *st, const char *p)
274
{
275
    char attr[256];
276
    char value[4096];
277
    int i;
278
    RTSPStream *rtsp_st = st->priv_data;
279
    AVCodecContext *codec = st->codec;
280
    RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
281

    
282
    /* loop on each attribute */
283
    while (ff_rtsp_next_attr_and_value(&p, attr, sizeof(attr),
284
                                       value, sizeof(value))) {
285
        /* grab the codec extra_data from the config parameter of the fmtp
286
         * line */
287
        sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
288
                              attr, value);
289
        /* Looking for a known attribute */
290
        for (i = 0; attr_names[i].str; ++i) {
291
            if (!strcasecmp(attr, attr_names[i].str)) {
292
                if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
293
                    *(int *)((char *)rtp_payload_data +
294
                        attr_names[i].offset) = atoi(value);
295
                } else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
296
                    *(char **)((char *)rtp_payload_data +
297
                        attr_names[i].offset) = av_strdup(value);
298
            }
299
        }
300
    }
301
}
302

    
303
/** Parse a string p in the form of Range:npt=xx-xx, and determine the start
304
 *  and end time.
305
 *  Used for seeking in the rtp stream.
306
 */
307
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
308
{
309
    char buf[256];
310

    
311
    skip_spaces(&p);
312
    if (!av_stristart(p, "npt=", &p))
313
        return;
314

    
315
    *start = AV_NOPTS_VALUE;
316
    *end = AV_NOPTS_VALUE;
317

    
318
    get_word_sep(buf, sizeof(buf), "-", &p);
319
    *start = parse_date(buf, 1);
320
    if (*p == '-') {
321
        p++;
322
        get_word_sep(buf, sizeof(buf), "-", &p);
323
        *end = parse_date(buf, 1);
324
    }
325
//    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
326
//    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
327
}
328

    
329
typedef struct SDPParseState {
330
    /* SDP only */
331
    struct in_addr default_ip;
332
    int            default_ttl;
333
    int            skip_media;  ///< set if an unknown m= line occurs
334
} SDPParseState;
335

    
336
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
337
                           int letter, const char *buf)
338
{
339
    RTSPState *rt = s->priv_data;
340
    char buf1[64], st_type[64];
341
    const char *p;
342
    enum AVMediaType codec_type;
343
    int payload_type, i;
344
    AVStream *st;
345
    RTSPStream *rtsp_st;
346
    struct in_addr sdp_ip;
347
    int ttl;
348

    
349
    dprintf(s, "sdp: %c='%s'\n", letter, buf);
350

    
351
    p = buf;
352
    if (s1->skip_media && letter != 'm')
353
        return;
354
    switch (letter) {
355
    case 'c':
356
        get_word(buf1, sizeof(buf1), &p);
357
        if (strcmp(buf1, "IN") != 0)
358
            return;
359
        get_word(buf1, sizeof(buf1), &p);
360
        if (strcmp(buf1, "IP4") != 0)
361
            return;
362
        get_word_sep(buf1, sizeof(buf1), "/", &p);
363
        if (ff_inet_aton(buf1, &sdp_ip) == 0)
364
            return;
365
        ttl = 16;
366
        if (*p == '/') {
367
            p++;
368
            get_word_sep(buf1, sizeof(buf1), "/", &p);
369
            ttl = atoi(buf1);
370
        }
371
        if (s->nb_streams == 0) {
372
            s1->default_ip = sdp_ip;
373
            s1->default_ttl = ttl;
374
        } else {
375
            st = s->streams[s->nb_streams - 1];
376
            rtsp_st = st->priv_data;
377
            rtsp_st->sdp_ip = sdp_ip;
378
            rtsp_st->sdp_ttl = ttl;
379
        }
380
        break;
381
    case 's':
382
        av_metadata_set2(&s->metadata, "title", p, 0);
383
        break;
384
    case 'i':
385
        if (s->nb_streams == 0) {
386
            av_metadata_set2(&s->metadata, "comment", p, 0);
387
            break;
388
        }
389
        break;
390
    case 'm':
391
        /* new stream */
392
        s1->skip_media = 0;
393
        get_word(st_type, sizeof(st_type), &p);
394
        if (!strcmp(st_type, "audio")) {
395
            codec_type = AVMEDIA_TYPE_AUDIO;
396
        } else if (!strcmp(st_type, "video")) {
397
            codec_type = AVMEDIA_TYPE_VIDEO;
398
        } else if (!strcmp(st_type, "application")) {
399
            codec_type = AVMEDIA_TYPE_DATA;
400
        } else {
401
            s1->skip_media = 1;
402
            return;
403
        }
404
        rtsp_st = av_mallocz(sizeof(RTSPStream));
405
        if (!rtsp_st)
406
            return;
407
        rtsp_st->stream_index = -1;
408
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
409

    
410
        rtsp_st->sdp_ip = s1->default_ip;
411
        rtsp_st->sdp_ttl = s1->default_ttl;
412

    
413
        get_word(buf1, sizeof(buf1), &p); /* port */
414
        rtsp_st->sdp_port = atoi(buf1);
415

    
416
        get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
417

    
418
        /* XXX: handle list of formats */
419
        get_word(buf1, sizeof(buf1), &p); /* format list */
420
        rtsp_st->sdp_payload_type = atoi(buf1);
421

    
422
        if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
423
            /* no corresponding stream */
424
        } else {
425
            st = av_new_stream(s, 0);
426
            if (!st)
427
                return;
428
            st->priv_data = rtsp_st;
429
            rtsp_st->stream_index = st->index;
430
            st->codec->codec_type = codec_type;
431
            if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
432
                /* if standard payload type, we can find the codec right now */
433
                ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
434
            }
435
        }
436
        /* put a default control url */
437
        av_strlcpy(rtsp_st->control_url, rt->control_uri,
438
                   sizeof(rtsp_st->control_url));
439
        break;
440
    case 'a':
441
        if (av_strstart(p, "control:", &p)) {
442
            if (s->nb_streams == 0) {
443
                if (!strncmp(p, "rtsp://", 7))
444
                    av_strlcpy(rt->control_uri, p,
445
                               sizeof(rt->control_uri));
446
            } else {
447
            char proto[32];
448
            /* get the control url */
449
            st = s->streams[s->nb_streams - 1];
450
            rtsp_st = st->priv_data;
451

    
452
            /* XXX: may need to add full url resolution */
453
            ff_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
454
                         NULL, NULL, 0, p);
455
            if (proto[0] == '\0') {
456
                /* relative control URL */
457
                if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
458
                av_strlcat(rtsp_st->control_url, "/",
459
                           sizeof(rtsp_st->control_url));
460
                av_strlcat(rtsp_st->control_url, p,
461
                           sizeof(rtsp_st->control_url));
462
            } else
463
                av_strlcpy(rtsp_st->control_url, p,
464
                           sizeof(rtsp_st->control_url));
465
            }
466
        } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
467
            /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
468
            get_word(buf1, sizeof(buf1), &p);
469
            payload_type = atoi(buf1);
470
            st = s->streams[s->nb_streams - 1];
471
            rtsp_st = st->priv_data;
472
            sdp_parse_rtpmap(s, st->codec, rtsp_st, payload_type, p);
473
        } else if (av_strstart(p, "fmtp:", &p)) {
474
            /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
475
            get_word(buf1, sizeof(buf1), &p);
476
            payload_type = atoi(buf1);
477
            for (i = 0; i < s->nb_streams; i++) {
478
                st      = s->streams[i];
479
                rtsp_st = st->priv_data;
480
                if (rtsp_st->sdp_payload_type == payload_type) {
481
                    if (!(rtsp_st->dynamic_handler &&
482
                          rtsp_st->dynamic_handler->parse_sdp_a_line &&
483
                          rtsp_st->dynamic_handler->parse_sdp_a_line(s,
484
                              i, rtsp_st->dynamic_protocol_context, buf)))
485
                        sdp_parse_fmtp(st, p);
486
                }
487
            }
488
        } else if (av_strstart(p, "framesize:", &p)) {
489
            // let dynamic protocol handlers have a stab at the line.
490
            get_word(buf1, sizeof(buf1), &p);
491
            payload_type = atoi(buf1);
492
            for (i = 0; i < s->nb_streams; i++) {
493
                st      = s->streams[i];
494
                rtsp_st = st->priv_data;
495
                if (rtsp_st->sdp_payload_type == payload_type &&
496
                    rtsp_st->dynamic_handler &&
497
                    rtsp_st->dynamic_handler->parse_sdp_a_line)
498
                    rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
499
                        rtsp_st->dynamic_protocol_context, buf);
500
            }
501
        } else if (av_strstart(p, "range:", &p)) {
502
            int64_t start, end;
503

    
504
            // this is so that seeking on a streamed file can work.
505
            rtsp_parse_range_npt(p, &start, &end);
506
            s->start_time = start;
507
            /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
508
            s->duration   = (end == AV_NOPTS_VALUE) ?
509
                            AV_NOPTS_VALUE : end - start;
510
        } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
511
            if (atoi(p) == 1)
512
                rt->transport = RTSP_TRANSPORT_RDT;
513
        } else {
514
            if (rt->server_type == RTSP_SERVER_WMS)
515
                ff_wms_parse_sdp_a_line(s, p);
516
            if (s->nb_streams > 0) {
517
                if (rt->server_type == RTSP_SERVER_REAL)
518
                    ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
519

    
520
                rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
521
                if (rtsp_st->dynamic_handler &&
522
                    rtsp_st->dynamic_handler->parse_sdp_a_line)
523
                    rtsp_st->dynamic_handler->parse_sdp_a_line(s,
524
                        s->nb_streams - 1,
525
                        rtsp_st->dynamic_protocol_context, buf);
526
            }
527
        }
528
        break;
529
    }
530
}
531

    
532
static int sdp_parse(AVFormatContext *s, const char *content)
533
{
534
    const char *p;
535
    int letter;
536
    /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
537
     * contain long SDP lines containing complete ASF Headers (several
538
     * kB) or arrays of MDPR (RM stream descriptor) headers plus
539
     * "rulebooks" describing their properties. Therefore, the SDP line
540
     * buffer is large.
541
     *
542
     * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
543
     * in rtpdec_xiph.c. */
544
    char buf[16384], *q;
545
    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
546

    
547
    memset(s1, 0, sizeof(SDPParseState));
548
    p = content;
549
    for (;;) {
550
        skip_spaces(&p);
551
        letter = *p;
552
        if (letter == '\0')
553
            break;
554
        p++;
555
        if (*p != '=')
556
            goto next_line;
557
        p++;
558
        /* get the content */
559
        q = buf;
560
        while (*p != '\n' && *p != '\r' && *p != '\0') {
561
            if ((q - buf) < sizeof(buf) - 1)
562
                *q++ = *p;
563
            p++;
564
        }
565
        *q = '\0';
566
        sdp_parse_line(s, s1, letter, buf);
567
    next_line:
568
        while (*p != '\n' && *p != '\0')
569
            p++;
570
        if (*p == '\n')
571
            p++;
572
    }
573
    return 0;
574
}
575

    
576
/* close and free RTSP streams */
577
void ff_rtsp_close_streams(AVFormatContext *s)
578
{
579
    RTSPState *rt = s->priv_data;
580
    int i;
581
    RTSPStream *rtsp_st;
582

    
583
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
584
        rtsp_st = rt->rtsp_streams[i];
585
        if (rtsp_st) {
586
            if (rtsp_st->transport_priv) {
587
                if (s->oformat) {
588
                    AVFormatContext *rtpctx = rtsp_st->transport_priv;
589
                    av_write_trailer(rtpctx);
590
                    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
591
                        uint8_t *ptr;
592
                        url_close_dyn_buf(rtpctx->pb, &ptr);
593
                        av_free(ptr);
594
                    } else {
595
                        url_fclose(rtpctx->pb);
596
                    }
597
                    av_metadata_free(&rtpctx->streams[0]->metadata);
598
                    av_metadata_free(&rtpctx->metadata);
599
                    av_free(rtpctx->streams[0]);
600
                    av_free(rtpctx);
601
                } else if (rt->transport == RTSP_TRANSPORT_RDT)
602
                    ff_rdt_parse_close(rtsp_st->transport_priv);
603
                else
604
                    rtp_parse_close(rtsp_st->transport_priv);
605
            }
606
            if (rtsp_st->rtp_handle)
607
                url_close(rtsp_st->rtp_handle);
608
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
609
                rtsp_st->dynamic_handler->close(
610
                    rtsp_st->dynamic_protocol_context);
611
        }
612
    }
613
    av_free(rt->rtsp_streams);
614
    if (rt->asf_ctx) {
615
        av_close_input_stream (rt->asf_ctx);
616
        rt->asf_ctx = NULL;
617
    }
618
}
619

    
620
static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st,
621
                               URLContext *handle)
622
{
623
    RTSPState *rt = s->priv_data;
624
    AVFormatContext *rtpctx;
625
    int ret;
626
    AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
627

    
628
    if (!rtp_format)
629
        return NULL;
630

    
631
    /* Allocate an AVFormatContext for each output stream */
632
    rtpctx = avformat_alloc_context();
633
    if (!rtpctx)
634
        return NULL;
635

    
636
    rtpctx->oformat = rtp_format;
637
    if (!av_new_stream(rtpctx, 0)) {
638
        av_free(rtpctx);
639
        return NULL;
640
    }
641
    /* Copy the max delay setting; the rtp muxer reads this. */
642
    rtpctx->max_delay = s->max_delay;
643
    /* Copy other stream parameters. */
644
    rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
645

    
646
    /* Set the synchronized start time. */
647
    rtpctx->start_time_realtime = rt->start_time;
648

    
649
    /* Remove the local codec, link to the original codec
650
     * context instead, to give the rtp muxer access to
651
     * codec parameters. */
652
    av_free(rtpctx->streams[0]->codec);
653
    rtpctx->streams[0]->codec = st->codec;
654

    
655
    if (handle) {
656
        url_fdopen(&rtpctx->pb, handle);
657
    } else
658
        url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
659
    ret = av_write_header(rtpctx);
660

    
661
    if (ret) {
662
        if (handle) {
663
            url_fclose(rtpctx->pb);
664
        } else {
665
            uint8_t *ptr;
666
            url_close_dyn_buf(rtpctx->pb, &ptr);
667
            av_free(ptr);
668
        }
669
        av_free(rtpctx->streams[0]);
670
        av_free(rtpctx);
671
        return NULL;
672
    }
673

    
674
    /* Copy the RTP AVStream timebase back to the original AVStream */
675
    st->time_base = rtpctx->streams[0]->time_base;
676
    return rtpctx;
677
}
678

    
679
static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
680
{
681
    RTSPState *rt = s->priv_data;
682
    AVStream *st = NULL;
683

    
684
    /* open the RTP context */
685
    if (rtsp_st->stream_index >= 0)
686
        st = s->streams[rtsp_st->stream_index];
687
    if (!st)
688
        s->ctx_flags |= AVFMTCTX_NOHEADER;
689

    
690
    if (s->oformat) {
691
        rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
692
        /* Ownership of rtp_handle is passed to the rtp mux context */
693
        rtsp_st->rtp_handle = NULL;
694
    } else if (rt->transport == RTSP_TRANSPORT_RDT)
695
        rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
696
                                            rtsp_st->dynamic_protocol_context,
697
                                            rtsp_st->dynamic_handler);
698
    else
699
        rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
700
                                         rtsp_st->sdp_payload_type,
701
                                         &rtsp_st->rtp_payload_data);
702

    
703
    if (!rtsp_st->transport_priv) {
704
         return AVERROR(ENOMEM);
705
    } else if (rt->transport != RTSP_TRANSPORT_RDT) {
706
        if (rtsp_st->dynamic_handler) {
707
            rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
708
                                           rtsp_st->dynamic_protocol_context,
709
                                           rtsp_st->dynamic_handler);
710
        }
711
    }
712

    
713
    return 0;
714
}
715

    
716
#if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
717
static int rtsp_probe(AVProbeData *p)
718
{
719
    if (av_strstart(p->filename, "rtsp:", NULL))
720
        return AVPROBE_SCORE_MAX;
721
    return 0;
722
}
723

    
724
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
725
{
726
    const char *p;
727
    int v;
728

    
729
    p = *pp;
730
    skip_spaces(&p);
731
    v = strtol(p, (char **)&p, 10);
732
    if (*p == '-') {
733
        p++;
734
        *min_ptr = v;
735
        v = strtol(p, (char **)&p, 10);
736
        *max_ptr = v;
737
    } else {
738
        *min_ptr = v;
739
        *max_ptr = v;
740
    }
741
    *pp = p;
742
}
743

    
744
/* XXX: only one transport specification is parsed */
745
static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
746
{
747
    char transport_protocol[16];
748
    char profile[16];
749
    char lower_transport[16];
750
    char parameter[16];
751
    RTSPTransportField *th;
752
    char buf[256];
753

    
754
    reply->nb_transports = 0;
755

    
756
    for (;;) {
757
        skip_spaces(&p);
758
        if (*p == '\0')
759
            break;
760

    
761
        th = &reply->transports[reply->nb_transports];
762

    
763
        get_word_sep(transport_protocol, sizeof(transport_protocol),
764
                     "/", &p);
765
        if (!strcasecmp (transport_protocol, "rtp")) {
766
            get_word_sep(profile, sizeof(profile), "/;,", &p);
767
            lower_transport[0] = '\0';
768
            /* rtp/avp/<protocol> */
769
            if (*p == '/') {
770
                get_word_sep(lower_transport, sizeof(lower_transport),
771
                             ";,", &p);
772
            }
773
            th->transport = RTSP_TRANSPORT_RTP;
774
        } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
775
                   !strcasecmp (transport_protocol, "x-real-rdt")) {
776
            /* x-pn-tng/<protocol> */
777
            get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
778
            profile[0] = '\0';
779
            th->transport = RTSP_TRANSPORT_RDT;
780
        }
781
        if (!strcasecmp(lower_transport, "TCP"))
782
            th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
783
        else
784
            th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
785

    
786
        if (*p == ';')
787
            p++;
788
        /* get each parameter */
789
        while (*p != '\0' && *p != ',') {
790
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
791
            if (!strcmp(parameter, "port")) {
792
                if (*p == '=') {
793
                    p++;
794
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
795
                }
796
            } else if (!strcmp(parameter, "client_port")) {
797
                if (*p == '=') {
798
                    p++;
799
                    rtsp_parse_range(&th->client_port_min,
800
                                     &th->client_port_max, &p);
801
                }
802
            } else if (!strcmp(parameter, "server_port")) {
803
                if (*p == '=') {
804
                    p++;
805
                    rtsp_parse_range(&th->server_port_min,
806
                                     &th->server_port_max, &p);
807
                }
808
            } else if (!strcmp(parameter, "interleaved")) {
809
                if (*p == '=') {
810
                    p++;
811
                    rtsp_parse_range(&th->interleaved_min,
812
                                     &th->interleaved_max, &p);
813
                }
814
            } else if (!strcmp(parameter, "multicast")) {
815
                if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
816
                    th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
817
            } else if (!strcmp(parameter, "ttl")) {
818
                if (*p == '=') {
819
                    p++;
820
                    th->ttl = strtol(p, (char **)&p, 10);
821
                }
822
            } else if (!strcmp(parameter, "destination")) {
823
                struct in_addr ipaddr;
824

    
825
                if (*p == '=') {
826
                    p++;
827
                    get_word_sep(buf, sizeof(buf), ";,", &p);
828
                    if (ff_inet_aton(buf, &ipaddr))
829
                        th->destination = ntohl(ipaddr.s_addr);
830
                }
831
            }
832
            while (*p != ';' && *p != '\0' && *p != ',')
833
                p++;
834
            if (*p == ';')
835
                p++;
836
        }
837
        if (*p == ',')
838
            p++;
839

    
840
        reply->nb_transports++;
841
    }
842
}
843

    
844
void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
845
                        HTTPAuthState *auth_state)
846
{
847
    const char *p;
848

    
849
    /* NOTE: we do case independent match for broken servers */
850
    p = buf;
851
    if (av_stristart(p, "Session:", &p)) {
852
        int t;
853
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
854
        if (av_stristart(p, ";timeout=", &p) &&
855
            (t = strtol(p, NULL, 10)) > 0) {
856
            reply->timeout = t;
857
        }
858
    } else if (av_stristart(p, "Content-Length:", &p)) {
859
        reply->content_length = strtol(p, NULL, 10);
860
    } else if (av_stristart(p, "Transport:", &p)) {
861
        rtsp_parse_transport(reply, p);
862
    } else if (av_stristart(p, "CSeq:", &p)) {
863
        reply->seq = strtol(p, NULL, 10);
864
    } else if (av_stristart(p, "Range:", &p)) {
865
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
866
    } else if (av_stristart(p, "RealChallenge1:", &p)) {
867
        skip_spaces(&p);
868
        av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
869
    } else if (av_stristart(p, "Server:", &p)) {
870
        skip_spaces(&p);
871
        av_strlcpy(reply->server, p, sizeof(reply->server));
872
    } else if (av_stristart(p, "Notice:", &p) ||
873
               av_stristart(p, "X-Notice:", &p)) {
874
        reply->notice = strtol(p, NULL, 10);
875
    } else if (av_stristart(p, "Location:", &p)) {
876
        skip_spaces(&p);
877
        av_strlcpy(reply->location, p , sizeof(reply->location));
878
    } else if (av_stristart(p, "WWW-Authenticate:", &p) && auth_state) {
879
        skip_spaces(&p);
880
        ff_http_auth_handle_header(auth_state, "WWW-Authenticate", p);
881
    } else if (av_stristart(p, "Authentication-Info:", &p) && auth_state) {
882
        skip_spaces(&p);
883
        ff_http_auth_handle_header(auth_state, "Authentication-Info", p);
884
    }
885
}
886

    
887
/* skip a RTP/TCP interleaved packet */
888
void ff_rtsp_skip_packet(AVFormatContext *s)
889
{
890
    RTSPState *rt = s->priv_data;
891
    int ret, len, len1;
892
    uint8_t buf[1024];
893

    
894
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
895
    if (ret != 3)
896
        return;
897
    len = AV_RB16(buf + 1);
898

    
899
    dprintf(s, "skipping RTP packet len=%d\n", len);
900

    
901
    /* skip payload */
902
    while (len > 0) {
903
        len1 = len;
904
        if (len1 > sizeof(buf))
905
            len1 = sizeof(buf);
906
        ret = url_read_complete(rt->rtsp_hd, buf, len1);
907
        if (ret != len1)
908
            return;
909
        len -= len1;
910
    }
911
}
912

    
913
int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
914
                       unsigned char **content_ptr,
915
                       int return_on_interleaved_data)
916
{
917
    RTSPState *rt = s->priv_data;
918
    char buf[4096], buf1[1024], *q;
919
    unsigned char ch;
920
    const char *p;
921
    int ret, content_length, line_count = 0;
922
    unsigned char *content = NULL;
923

    
924
    memset(reply, 0, sizeof(*reply));
925

    
926
    /* parse reply (XXX: use buffers) */
927
    rt->last_reply[0] = '\0';
928
    for (;;) {
929
        q = buf;
930
        for (;;) {
931
            ret = url_read_complete(rt->rtsp_hd, &ch, 1);
932
#ifdef DEBUG_RTP_TCP
933
            dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
934
#endif
935
            if (ret != 1)
936
                return -1;
937
            if (ch == '\n')
938
                break;
939
            if (ch == '$') {
940
                /* XXX: only parse it if first char on line ? */
941
                if (return_on_interleaved_data) {
942
                    return 1;
943
                } else
944
                    ff_rtsp_skip_packet(s);
945
            } else if (ch != '\r') {
946
                if ((q - buf) < sizeof(buf) - 1)
947
                    *q++ = ch;
948
            }
949
        }
950
        *q = '\0';
951

    
952
        dprintf(s, "line='%s'\n", buf);
953

    
954
        /* test if last line */
955
        if (buf[0] == '\0')
956
            break;
957
        p = buf;
958
        if (line_count == 0) {
959
            /* get reply code */
960
            get_word(buf1, sizeof(buf1), &p);
961
            get_word(buf1, sizeof(buf1), &p);
962
            reply->status_code = atoi(buf1);
963
        } else {
964
            ff_rtsp_parse_line(reply, p, &rt->auth_state);
965
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
966
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
967
        }
968
        line_count++;
969
    }
970

    
971
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
972
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
973

    
974
    content_length = reply->content_length;
975
    if (content_length > 0) {
976
        /* leave some room for a trailing '\0' (useful for simple parsing) */
977
        content = av_malloc(content_length + 1);
978
        (void)url_read_complete(rt->rtsp_hd, content, content_length);
979
        content[content_length] = '\0';
980
    }
981
    if (content_ptr)
982
        *content_ptr = content;
983
    else
984
        av_free(content);
985

    
986
    if (rt->seq != reply->seq) {
987
        av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
988
            rt->seq, reply->seq);
989
    }
990

    
991
    /* EOS */
992
    if (reply->notice == 2101 /* End-of-Stream Reached */      ||
993
        reply->notice == 2104 /* Start-of-Stream Reached */    ||
994
        reply->notice == 2306 /* Continuous Feed Terminated */) {
995
        rt->state = RTSP_STATE_IDLE;
996
    } else if (reply->notice >= 4400 && reply->notice < 5500) {
997
        return AVERROR(EIO); /* data or server error */
998
    } else if (reply->notice == 2401 /* Ticket Expired */ ||
999
             (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
1000
        return AVERROR(EPERM);
1001

    
1002
    return 0;
1003
}
1004

    
1005
int ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
1006
                                        const char *method, const char *url,
1007
                                        const char *headers,
1008
                                        const unsigned char *send_content,
1009
                                        int send_content_length)
1010
{
1011
    RTSPState *rt = s->priv_data;
1012
    char buf[4096], *out_buf;
1013
    char base64buf[AV_BASE64_SIZE(sizeof(buf))];
1014

    
1015
    /* Add in RTSP headers */
1016
    out_buf = buf;
1017
    rt->seq++;
1018
    snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
1019
    if (headers)
1020
        av_strlcat(buf, headers, sizeof(buf));
1021
    av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
1022
    if (rt->session_id[0] != '\0' && (!headers ||
1023
        !strstr(headers, "\nIf-Match:"))) {
1024
        av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
1025
    }
1026
    if (rt->auth[0]) {
1027
        char *str = ff_http_auth_create_response(&rt->auth_state,
1028
                                                 rt->auth, url, method);
1029
        if (str)
1030
            av_strlcat(buf, str, sizeof(buf));
1031
        av_free(str);
1032
    }
1033
    if (send_content_length > 0 && send_content)
1034
        av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
1035
    av_strlcat(buf, "\r\n", sizeof(buf));
1036

    
1037
    /* base64 encode rtsp if tunneling */
1038
    if (rt->control_transport == RTSP_MODE_TUNNEL) {
1039
        av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
1040
        out_buf = base64buf;
1041
    }
1042

    
1043
    dprintf(s, "Sending:\n%s--\n", buf);
1044

    
1045
    url_write(rt->rtsp_hd_out, out_buf, strlen(out_buf));
1046
    if (send_content_length > 0 && send_content) {
1047
        if (rt->control_transport == RTSP_MODE_TUNNEL) {
1048
            av_log(s, AV_LOG_ERROR, "tunneling of RTSP requests "
1049
                                    "with content data not supported\n");
1050
            return AVERROR_PATCHWELCOME;
1051
        }
1052
        url_write(rt->rtsp_hd_out, send_content, send_content_length);
1053
    }
1054
    rt->last_cmd_time = av_gettime();
1055

    
1056
    return 0;
1057
}
1058

    
1059
int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
1060
                           const char *url, const char *headers)
1061
{
1062
    return ff_rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
1063
}
1064

    
1065
int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
1066
                     const char *headers, RTSPMessageHeader *reply,
1067
                     unsigned char **content_ptr)
1068
{
1069
    return ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
1070
                                         content_ptr, NULL, 0);
1071
}
1072

    
1073
int ff_rtsp_send_cmd_with_content(AVFormatContext *s,
1074
                                  const char *method, const char *url,
1075
                                  const char *header,
1076
                                  RTSPMessageHeader *reply,
1077
                                  unsigned char **content_ptr,
1078
                                  const unsigned char *send_content,
1079
                                  int send_content_length)
1080
{
1081
    RTSPState *rt = s->priv_data;
1082
    HTTPAuthType cur_auth_type;
1083
    int ret;
1084

    
1085
retry:
1086
    cur_auth_type = rt->auth_state.auth_type;
1087
    if ((ret = ff_rtsp_send_cmd_with_content_async(s, method, url, header,
1088
                                                   send_content,
1089
                                                   send_content_length)))
1090
        return ret;
1091

    
1092
    if ((ret = ff_rtsp_read_reply(s, reply, content_ptr, 0) ) < 0)
1093
        return ret;
1094

    
1095
    if (reply->status_code == 401 && cur_auth_type == HTTP_AUTH_NONE &&
1096
        rt->auth_state.auth_type != HTTP_AUTH_NONE)
1097
        goto retry;
1098

    
1099
    return 0;
1100
}
1101

    
1102
/**
1103
 * @return 0 on success, <0 on error, 1 if protocol is unavailable.
1104
 */
1105
static int make_setup_request(AVFormatContext *s, const char *host, int port,
1106
                              int lower_transport, const char *real_challenge)
1107
{
1108
    RTSPState *rt = s->priv_data;
1109
    int rtx, j, i, err, interleave = 0;
1110
    RTSPStream *rtsp_st;
1111
    RTSPMessageHeader reply1, *reply = &reply1;
1112
    char cmd[2048];
1113
    const char *trans_pref;
1114

    
1115
    if (rt->transport == RTSP_TRANSPORT_RDT)
1116
        trans_pref = "x-pn-tng";
1117
    else
1118
        trans_pref = "RTP/AVP";
1119

    
1120
    /* default timeout: 1 minute */
1121
    rt->timeout = 60;
1122

    
1123
    /* for each stream, make the setup request */
1124
    /* XXX: we assume the same server is used for the control of each
1125
     * RTSP stream */
1126

    
1127
    for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1128
        char transport[2048];
1129

    
1130
        /**
1131
         * WMS serves all UDP data over a single connection, the RTX, which
1132
         * isn't necessarily the first in the SDP but has to be the first
1133
         * to be set up, else the second/third SETUP will fail with a 461.
1134
         */
1135
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1136
             rt->server_type == RTSP_SERVER_WMS) {
1137
            if (i == 0) {
1138
                /* rtx first */
1139
                for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1140
                    int len = strlen(rt->rtsp_streams[rtx]->control_url);
1141
                    if (len >= 4 &&
1142
                        !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1143
                                "/rtx"))
1144
                        break;
1145
                }
1146
                if (rtx == rt->nb_rtsp_streams)
1147
                    return -1; /* no RTX found */
1148
                rtsp_st = rt->rtsp_streams[rtx];
1149
            } else
1150
                rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1151
        } else
1152
            rtsp_st = rt->rtsp_streams[i];
1153

    
1154
        /* RTP/UDP */
1155
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1156
            char buf[256];
1157

    
1158
            if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1159
                port = reply->transports[0].client_port_min;
1160
                goto have_port;
1161
            }
1162

    
1163
            /* first try in specified port range */
1164
            if (RTSP_RTP_PORT_MIN != 0) {
1165
                while (j <= RTSP_RTP_PORT_MAX) {
1166
                    ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1167
                                "?localport=%d", j);
1168
                    /* we will use two ports per rtp stream (rtp and rtcp) */
1169
                    j += 2;
1170
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1171
                        goto rtp_opened;
1172
                }
1173
            }
1174

    
1175
#if 0
1176
            /* then try on any port */
1177
            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1178
                err = AVERROR_INVALIDDATA;
1179
                goto fail;
1180
            }
1181
#endif
1182

    
1183
        rtp_opened:
1184
            port = rtp_get_local_port(rtsp_st->rtp_handle);
1185
        have_port:
1186
            snprintf(transport, sizeof(transport) - 1,
1187
                     "%s/UDP;", trans_pref);
1188
            if (rt->server_type != RTSP_SERVER_REAL)
1189
                av_strlcat(transport, "unicast;", sizeof(transport));
1190
            av_strlcatf(transport, sizeof(transport),
1191
                     "client_port=%d", port);
1192
            if (rt->transport == RTSP_TRANSPORT_RTP &&
1193
                !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1194
                av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1195
        }
1196

    
1197
        /* RTP/TCP */
1198
        else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1199
            /** For WMS streams, the application streams are only used for
1200
             * UDP. When trying to set it up for TCP streams, the server
1201
             * will return an error. Therefore, we skip those streams. */
1202
            if (rt->server_type == RTSP_SERVER_WMS &&
1203
                s->streams[rtsp_st->stream_index]->codec->codec_type ==
1204
                    AVMEDIA_TYPE_DATA)
1205
                continue;
1206
            snprintf(transport, sizeof(transport) - 1,
1207
                     "%s/TCP;", trans_pref);
1208
            if (rt->server_type == RTSP_SERVER_WMS)
1209
                av_strlcat(transport, "unicast;", sizeof(transport));
1210
            av_strlcatf(transport, sizeof(transport),
1211
                        "interleaved=%d-%d",
1212
                        interleave, interleave + 1);
1213
            interleave += 2;
1214
        }
1215

    
1216
        else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1217
            snprintf(transport, sizeof(transport) - 1,
1218
                     "%s/UDP;multicast", trans_pref);
1219
        }
1220
        if (s->oformat) {
1221
            av_strlcat(transport, ";mode=receive", sizeof(transport));
1222
        } else if (rt->server_type == RTSP_SERVER_REAL ||
1223
                   rt->server_type == RTSP_SERVER_WMS)
1224
            av_strlcat(transport, ";mode=play", sizeof(transport));
1225
        snprintf(cmd, sizeof(cmd),
1226
                 "Transport: %s\r\n",
1227
                 transport);
1228
        if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1229
            char real_res[41], real_csum[9];
1230
            ff_rdt_calc_response_and_checksum(real_res, real_csum,
1231
                                              real_challenge);
1232
            av_strlcatf(cmd, sizeof(cmd),
1233
                        "If-Match: %s\r\n"
1234
                        "RealChallenge2: %s, sd=%s\r\n",
1235
                        rt->session_id, real_res, real_csum);
1236
        }
1237
        ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1238
        if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1239
            err = 1;
1240
            goto fail;
1241
        } else if (reply->status_code != RTSP_STATUS_OK ||
1242
                   reply->nb_transports != 1) {
1243
            err = AVERROR_INVALIDDATA;
1244
            goto fail;
1245
        }
1246

    
1247
        /* XXX: same protocol for all streams is required */
1248
        if (i > 0) {
1249
            if (reply->transports[0].lower_transport != rt->lower_transport ||
1250
                reply->transports[0].transport != rt->transport) {
1251
                err = AVERROR_INVALIDDATA;
1252
                goto fail;
1253
            }
1254
        } else {
1255
            rt->lower_transport = reply->transports[0].lower_transport;
1256
            rt->transport = reply->transports[0].transport;
1257
        }
1258

    
1259
        /* close RTP connection if not choosen */
1260
        if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1261
            (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1262
            url_close(rtsp_st->rtp_handle);
1263
            rtsp_st->rtp_handle = NULL;
1264
        }
1265

    
1266
        switch(reply->transports[0].lower_transport) {
1267
        case RTSP_LOWER_TRANSPORT_TCP:
1268
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1269
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1270
            break;
1271

    
1272
        case RTSP_LOWER_TRANSPORT_UDP: {
1273
            char url[1024];
1274

    
1275
            /* XXX: also use address if specified */
1276
            ff_url_join(url, sizeof(url), "rtp", NULL, host,
1277
                        reply->transports[0].server_port_min, NULL);
1278
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1279
                rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1280
                err = AVERROR_INVALIDDATA;
1281
                goto fail;
1282
            }
1283
            /* Try to initialize the connection state in a
1284
             * potential NAT router by sending dummy packets.
1285
             * RTP/RTCP dummy packets are used for RDT, too.
1286
             */
1287
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1288
                rtp_send_punch_packets(rtsp_st->rtp_handle);
1289
            break;
1290
        }
1291
        case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1292
            char url[1024];
1293
            struct in_addr in;
1294
            int port, ttl;
1295

    
1296
            if (reply->transports[0].destination) {
1297
                in.s_addr = htonl(reply->transports[0].destination);
1298
                port      = reply->transports[0].port_min;
1299
                ttl       = reply->transports[0].ttl;
1300
            } else {
1301
                in        = rtsp_st->sdp_ip;
1302
                port      = rtsp_st->sdp_port;
1303
                ttl       = rtsp_st->sdp_ttl;
1304
            }
1305
            ff_url_join(url, sizeof(url), "rtp", NULL, inet_ntoa(in),
1306
                        port, "?ttl=%d", ttl);
1307
            if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1308
                err = AVERROR_INVALIDDATA;
1309
                goto fail;
1310
            }
1311
            break;
1312
        }
1313
        }
1314

    
1315
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1316
            goto fail;
1317
    }
1318

    
1319
    if (reply->timeout > 0)
1320
        rt->timeout = reply->timeout;
1321

    
1322
    if (rt->server_type == RTSP_SERVER_REAL)
1323
        rt->need_subscription = 1;
1324

    
1325
    return 0;
1326

    
1327
fail:
1328
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1329
        if (rt->rtsp_streams[i]->rtp_handle) {
1330
            url_close(rt->rtsp_streams[i]->rtp_handle);
1331
            rt->rtsp_streams[i]->rtp_handle = NULL;
1332
        }
1333
    }
1334
    return err;
1335
}
1336

    
1337
static int rtsp_read_play(AVFormatContext *s)
1338
{
1339
    RTSPState *rt = s->priv_data;
1340
    RTSPMessageHeader reply1, *reply = &reply1;
1341
    int i;
1342
    char cmd[1024];
1343

    
1344
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1345

    
1346
    if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1347
        if (rt->state == RTSP_STATE_PAUSED) {
1348
            cmd[0] = 0;
1349
        } else {
1350
            snprintf(cmd, sizeof(cmd),
1351
                     "Range: npt=%0.3f-\r\n",
1352
                     (double)rt->seek_timestamp / AV_TIME_BASE);
1353
        }
1354
        ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
1355
        if (reply->status_code != RTSP_STATUS_OK) {
1356
            return -1;
1357
        }
1358
        if (reply->range_start != AV_NOPTS_VALUE &&
1359
            rt->transport == RTSP_TRANSPORT_RTP) {
1360
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1361
                RTSPStream *rtsp_st = rt->rtsp_streams[i];
1362
                RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1363
                AVStream *st = NULL;
1364
                if (!rtpctx)
1365
                    continue;
1366
                if (rtsp_st->stream_index >= 0)
1367
                    st = s->streams[rtsp_st->stream_index];
1368
                rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
1369
                rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
1370
                if (st)
1371
                    rtpctx->range_start_offset = av_rescale_q(reply->range_start,
1372
                                                              AV_TIME_BASE_Q,
1373
                                                              st->time_base);
1374
            }
1375
        }
1376
    }
1377
    rt->state = RTSP_STATE_STREAMING;
1378
    return 0;
1379
}
1380

    
1381
static int rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
1382
{
1383
    RTSPState *rt = s->priv_data;
1384
    char cmd[1024];
1385
    unsigned char *content = NULL;
1386
    int ret;
1387

    
1388
    /* describe the stream */
1389
    snprintf(cmd, sizeof(cmd),
1390
             "Accept: application/sdp\r\n");
1391
    if (rt->server_type == RTSP_SERVER_REAL) {
1392
        /**
1393
         * The Require: attribute is needed for proper streaming from
1394
         * Realmedia servers.
1395
         */
1396
        av_strlcat(cmd,
1397
                   "Require: com.real.retain-entity-for-setup\r\n",
1398
                   sizeof(cmd));
1399
    }
1400
    ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
1401
    if (!content)
1402
        return AVERROR_INVALIDDATA;
1403
    if (reply->status_code != RTSP_STATUS_OK) {
1404
        av_freep(&content);
1405
        return AVERROR_INVALIDDATA;
1406
    }
1407

    
1408
    /* now we got the SDP description, we parse it */
1409
    ret = sdp_parse(s, (const char *)content);
1410
    av_freep(&content);
1411
    if (ret < 0)
1412
        return AVERROR_INVALIDDATA;
1413

    
1414
    return 0;
1415
}
1416

    
1417
static int rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
1418
{
1419
    RTSPState *rt = s->priv_data;
1420
    RTSPMessageHeader reply1, *reply = &reply1;
1421
    int i;
1422
    char *sdp;
1423
    AVFormatContext sdp_ctx, *ctx_array[1];
1424

    
1425
    rt->start_time = av_gettime();
1426

    
1427
    /* Announce the stream */
1428
    sdp = av_mallocz(8192);
1429
    if (sdp == NULL)
1430
        return AVERROR(ENOMEM);
1431
    /* We create the SDP based on the RTSP AVFormatContext where we
1432
     * aren't allowed to change the filename field. (We create the SDP
1433
     * based on the RTSP context since the contexts for the RTP streams
1434
     * don't exist yet.) In order to specify a custom URL with the actual
1435
     * peer IP instead of the originally specified hostname, we create
1436
     * a temporary copy of the AVFormatContext, where the custom URL is set.
1437
     *
1438
     * FIXME: Create the SDP without copying the AVFormatContext.
1439
     * This either requires setting up the RTP stream AVFormatContexts
1440
     * already here (complicating things immensely) or getting a more
1441
     * flexible SDP creation interface.
1442
     */
1443
    sdp_ctx = *s;
1444
    ff_url_join(sdp_ctx.filename, sizeof(sdp_ctx.filename),
1445
                "rtsp", NULL, addr, -1, NULL);
1446
    ctx_array[0] = &sdp_ctx;
1447
    if (avf_sdp_create(ctx_array, 1, sdp, 8192)) {
1448
        av_free(sdp);
1449
        return AVERROR_INVALIDDATA;
1450
    }
1451
    av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
1452
    ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri,
1453
                                  "Content-Type: application/sdp\r\n",
1454
                                  reply, NULL, sdp, strlen(sdp));
1455
    av_free(sdp);
1456
    if (reply->status_code != RTSP_STATUS_OK)
1457
        return AVERROR_INVALIDDATA;
1458

    
1459
    /* Set up the RTSPStreams for each AVStream */
1460
    for (i = 0; i < s->nb_streams; i++) {
1461
        RTSPStream *rtsp_st;
1462
        AVStream *st = s->streams[i];
1463

    
1464
        rtsp_st = av_mallocz(sizeof(RTSPStream));
1465
        if (!rtsp_st)
1466
            return AVERROR(ENOMEM);
1467
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
1468

    
1469
        st->priv_data = rtsp_st;
1470
        rtsp_st->stream_index = i;
1471

    
1472
        av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
1473
        /* Note, this must match the relative uri set in the sdp content */
1474
        av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
1475
                    "/streamid=%d", i);
1476
    }
1477

    
1478
    return 0;
1479
}
1480

    
1481
void ff_rtsp_close_connections(AVFormatContext *s)
1482
{
1483
    RTSPState *rt = s->priv_data;
1484
    if (rt->rtsp_hd_out != rt->rtsp_hd) url_close(rt->rtsp_hd_out);
1485
    url_close(rt->rtsp_hd);
1486
    rt->rtsp_hd = rt->rtsp_hd_out = NULL;
1487
}
1488

    
1489
int ff_rtsp_connect(AVFormatContext *s)
1490
{
1491
    RTSPState *rt = s->priv_data;
1492
    char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1493
    char *option_list, *option, *filename;
1494
    int port, err, tcp_fd;
1495
    RTSPMessageHeader reply1 = {}, *reply = &reply1;
1496
    int lower_transport_mask = 0;
1497
    char real_challenge[64];
1498
    struct sockaddr_storage peer;
1499
    socklen_t peer_len = sizeof(peer);
1500

    
1501
    if (!ff_network_init())
1502
        return AVERROR(EIO);
1503
redirect:
1504
    rt->control_transport = RTSP_MODE_PLAIN;
1505
    /* extract hostname and port */
1506
    ff_url_split(NULL, 0, auth, sizeof(auth),
1507
                 host, sizeof(host), &port, path, sizeof(path), s->filename);
1508
    if (*auth) {
1509
        av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1510
    }
1511
    if (port < 0)
1512
        port = RTSP_DEFAULT_PORT;
1513

    
1514
    /* search for options */
1515
    option_list = strrchr(path, '?');
1516
    if (option_list) {
1517
        /* Strip out the RTSP specific options, write out the rest of
1518
         * the options back into the same string. */
1519
        filename = option_list;
1520
        while (option_list) {
1521
            /* move the option pointer */
1522
            option = ++option_list;
1523
            option_list = strchr(option_list, '&');
1524
            if (option_list)
1525
                *option_list = 0;
1526

    
1527
            /* handle the options */
1528
            if (!strcmp(option, "udp")) {
1529
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP);
1530
            } else if (!strcmp(option, "multicast")) {
1531
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1532
            } else if (!strcmp(option, "tcp")) {
1533
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1534
            } else if(!strcmp(option, "http")) {
1535
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1536
                rt->control_transport = RTSP_MODE_TUNNEL;
1537
            } else {
1538
                /* Write options back into the buffer, using memmove instead
1539
                 * of strcpy since the strings may overlap. */
1540
                int len = strlen(option);
1541
                memmove(++filename, option, len);
1542
                filename += len;
1543
                if (option_list) *filename = '&';
1544
            }
1545
        }
1546
        *filename = 0;
1547
    }
1548

    
1549
    if (!lower_transport_mask)
1550
        lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1551

    
1552
    if (s->oformat) {
1553
        /* Only UDP or TCP - UDP multicast isn't supported. */
1554
        lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1555
                                (1 << RTSP_LOWER_TRANSPORT_TCP);
1556
        if (!lower_transport_mask || rt->control_transport == RTSP_MODE_TUNNEL) {
1557
            av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1558
                                    "only UDP and TCP are supported for output.\n");
1559
            err = AVERROR(EINVAL);
1560
            goto fail;
1561
        }
1562
    }
1563

    
1564
    /* Construct the URI used in request; this is similar to s->filename,
1565
     * but with authentication credentials removed and RTSP specific options
1566
     * stripped out. */
1567
    ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1568
                host, port, "%s", path);
1569

    
1570
    if (rt->control_transport == RTSP_MODE_TUNNEL) {
1571
        /* set up initial handshake for tunneling */
1572
        char httpname[1024];
1573
        char sessioncookie[17];
1574
        char headers[1024];
1575

    
1576
        ff_url_join(httpname, sizeof(httpname), "http", auth, host, port, "%s", path);
1577
        snprintf(sessioncookie, sizeof(sessioncookie), "%08x%08x",
1578
                 av_get_random_seed(), av_get_random_seed());
1579

    
1580
        /* GET requests */
1581
        if (url_open(&rt->rtsp_hd, httpname, URL_RDONLY) < 0) {
1582
            err = AVERROR(EIO);
1583
            goto fail;
1584
        }
1585

    
1586
        /* generate GET headers */
1587
        snprintf(headers, sizeof(headers),
1588
                 "x-sessioncookie: %s\r\n"
1589
                 "Accept: application/x-rtsp-tunnelled\r\n"
1590
                 "Pragma: no-cache\r\n"
1591
                 "Cache-Control: no-cache\r\n",
1592
                 sessioncookie);
1593
        ff_http_set_headers(rt->rtsp_hd, headers);
1594

    
1595
        /* complete the connection */
1596
        if (url_read(rt->rtsp_hd, NULL, 0)) {
1597
            err = AVERROR(EIO);
1598
            goto fail;
1599
        }
1600

    
1601
        /* POST requests */
1602
        if (url_open(&rt->rtsp_hd_out, httpname, URL_WRONLY) < 0 ) {
1603
            err = AVERROR(EIO);
1604
            goto fail;
1605
        }
1606

    
1607
        /* generate POST headers */
1608
        snprintf(headers, sizeof(headers),
1609
                 "x-sessioncookie: %s\r\n"
1610
                 "Content-Type: application/x-rtsp-tunnelled\r\n"
1611
                 "Pragma: no-cache\r\n"
1612
                 "Cache-Control: no-cache\r\n"
1613
                 "Content-Length: 32767\r\n"
1614
                 "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
1615
                 sessioncookie);
1616
        ff_http_set_headers(rt->rtsp_hd_out, headers);
1617
        ff_http_set_chunked_transfer_encoding(rt->rtsp_hd_out, 0);
1618

    
1619
    } else {
1620
        /* open the tcp connection */
1621
        ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
1622
        if (url_open(&rt->rtsp_hd, tcpname, URL_RDWR) < 0) {
1623
            err = AVERROR(EIO);
1624
            goto fail;
1625
        }
1626
        rt->rtsp_hd_out = rt->rtsp_hd;
1627
    }
1628
    rt->seq = 0;
1629

    
1630
    tcp_fd = url_get_file_handle(rt->rtsp_hd);
1631
    if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1632
        getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1633
                    NULL, 0, NI_NUMERICHOST);
1634
    }
1635

    
1636
    /* request options supported by the server; this also detects server
1637
     * type */
1638
    for (rt->server_type = RTSP_SERVER_RTP;;) {
1639
        cmd[0] = 0;
1640
        if (rt->server_type == RTSP_SERVER_REAL)
1641
            av_strlcat(cmd,
1642
                       /**
1643
                        * The following entries are required for proper
1644
                        * streaming from a Realmedia server. They are
1645
                        * interdependent in some way although we currently
1646
                        * don't quite understand how. Values were copied
1647
                        * from mplayer SVN r23589.
1648
                        * @param CompanyID is a 16-byte ID in base64
1649
                        * @param ClientChallenge is a 16-byte ID in hex
1650
                        */
1651
                       "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1652
                       "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1653
                       "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1654
                       "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1655
                       sizeof(cmd));
1656
        ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1657
        if (reply->status_code != RTSP_STATUS_OK) {
1658
            err = AVERROR_INVALIDDATA;
1659
            goto fail;
1660
        }
1661

    
1662
        /* detect server type if not standard-compliant RTP */
1663
        if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1664
            rt->server_type = RTSP_SERVER_REAL;
1665
            continue;
1666
        } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1667
            rt->server_type = RTSP_SERVER_WMS;
1668
        } else if (rt->server_type == RTSP_SERVER_REAL)
1669
            strcpy(real_challenge, reply->real_challenge);
1670
        break;
1671
    }
1672

    
1673
    if (s->iformat)
1674
        err = rtsp_setup_input_streams(s, reply);
1675
    else
1676
        err = rtsp_setup_output_streams(s, host);
1677
    if (err)
1678
        goto fail;
1679

    
1680
    do {
1681
        int lower_transport = ff_log2_tab[lower_transport_mask &
1682
                                  ~(lower_transport_mask - 1)];
1683

    
1684
        err = make_setup_request(s, host, port, lower_transport,
1685
                                 rt->server_type == RTSP_SERVER_REAL ?
1686
                                     real_challenge : NULL);
1687
        if (err < 0)
1688
            goto fail;
1689
        lower_transport_mask &= ~(1 << lower_transport);
1690
        if (lower_transport_mask == 0 && err == 1) {
1691
            err = FF_NETERROR(EPROTONOSUPPORT);
1692
            goto fail;
1693
        }
1694
    } while (err);
1695

    
1696
    rt->state = RTSP_STATE_IDLE;
1697
    rt->seek_timestamp = 0; /* default is to start stream at position zero */
1698
    return 0;
1699
 fail:
1700
    ff_rtsp_close_streams(s);
1701
    ff_rtsp_close_connections(s);
1702
    if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1703
        av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1704
        av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1705
               reply->status_code,
1706
               s->filename);
1707
        goto redirect;
1708
    }
1709
    ff_network_close();
1710
    return err;
1711
}
1712
#endif
1713

    
1714
#if CONFIG_RTSP_DEMUXER
1715
static int rtsp_read_header(AVFormatContext *s,
1716
                            AVFormatParameters *ap)
1717
{
1718
    int ret;
1719

    
1720
    ret = ff_rtsp_connect(s);
1721
    if (ret)
1722
        return ret;
1723

    
1724
    if (ap->initial_pause) {
1725
         /* do not start immediately */
1726
    } else {
1727
         if (rtsp_read_play(s) < 0) {
1728
            ff_rtsp_close_streams(s);
1729
            ff_rtsp_close_connections(s);
1730
            return AVERROR_INVALIDDATA;
1731
        }
1732
    }
1733

    
1734
    return 0;
1735
}
1736

    
1737
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1738
                           uint8_t *buf, int buf_size)
1739
{
1740
    RTSPState *rt = s->priv_data;
1741
    RTSPStream *rtsp_st;
1742
    fd_set rfds;
1743
    int fd, fd_max, n, i, ret, tcp_fd, timeout_cnt = 0;
1744
    struct timeval tv;
1745

    
1746
    for (;;) {
1747
        if (url_interrupt_cb())
1748
            return AVERROR(EINTR);
1749
        FD_ZERO(&rfds);
1750
        if (rt->rtsp_hd) {
1751
            tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1752
            FD_SET(tcp_fd, &rfds);
1753
        } else {
1754
            fd_max = 0;
1755
            tcp_fd = -1;
1756
        }
1757
        for (i = 0; i < rt->nb_rtsp_streams; i++) {
1758
            rtsp_st = rt->rtsp_streams[i];
1759
            if (rtsp_st->rtp_handle) {
1760
                /* currently, we cannot probe RTCP handle because of
1761
                 * blocking restrictions */
1762
                fd = url_get_file_handle(rtsp_st->rtp_handle);
1763
                if (fd > fd_max)
1764
                    fd_max = fd;
1765
                FD_SET(fd, &rfds);
1766
            }
1767
        }
1768
        tv.tv_sec = 0;
1769
        tv.tv_usec = SELECT_TIMEOUT_MS * 1000;
1770
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1771
        if (n > 0) {
1772
            timeout_cnt = 0;
1773
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1774
                rtsp_st = rt->rtsp_streams[i];
1775
                if (rtsp_st->rtp_handle) {
1776
                    fd = url_get_file_handle(rtsp_st->rtp_handle);
1777
                    if (FD_ISSET(fd, &rfds)) {
1778
                        ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1779
                        if (ret > 0) {
1780
                            *prtsp_st = rtsp_st;
1781
                            return ret;
1782
                        }
1783
                    }
1784
                }
1785
            }
1786
#if CONFIG_RTSP_DEMUXER
1787
            if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1788
                RTSPMessageHeader reply;
1789

    
1790
                ret = ff_rtsp_read_reply(s, &reply, NULL, 0);
1791
                if (ret < 0)
1792
                    return ret;
1793
                /* XXX: parse message */
1794
                if (rt->state != RTSP_STATE_STREAMING)
1795
                    return 0;
1796
            }
1797
#endif
1798
        } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1799
            return FF_NETERROR(ETIMEDOUT);
1800
        } else if (n < 0 && errno != EINTR)
1801
            return AVERROR(errno);
1802
    }
1803
}
1804

    
1805
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1806
                           uint8_t *buf, int buf_size)
1807
{
1808
    RTSPState *rt = s->priv_data;
1809
    int id, len, i, ret;
1810
    RTSPStream *rtsp_st;
1811

    
1812
#ifdef DEBUG_RTP_TCP
1813
    dprintf(s, "tcp_read_packet:\n");
1814
#endif
1815
redo:
1816
    for (;;) {
1817
        RTSPMessageHeader reply;
1818

    
1819
        ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
1820
        if (ret == -1)
1821
            return -1;
1822
        if (ret == 1) /* received '$' */
1823
            break;
1824
        /* XXX: parse message */
1825
        if (rt->state != RTSP_STATE_STREAMING)
1826
            return 0;
1827
    }
1828
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
1829
    if (ret != 3)
1830
        return -1;
1831
    id  = buf[0];
1832
    len = AV_RB16(buf + 1);
1833
#ifdef DEBUG_RTP_TCP
1834
    dprintf(s, "id=%d len=%d\n", id, len);
1835
#endif
1836
    if (len > buf_size || len < 12)
1837
        goto redo;
1838
    /* get the data */
1839
    ret = url_read_complete(rt->rtsp_hd, buf, len);
1840
    if (ret != len)
1841
        return -1;
1842
    if (rt->transport == RTSP_TRANSPORT_RDT &&
1843
        ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1844
        return -1;
1845

    
1846
    /* find the matching stream */
1847
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1848
        rtsp_st = rt->rtsp_streams[i];
1849
        if (id >= rtsp_st->interleaved_min &&
1850
            id <= rtsp_st->interleaved_max)
1851
            goto found;
1852
    }
1853
    goto redo;
1854
found:
1855
    *prtsp_st = rtsp_st;
1856
    return len;
1857
}
1858

    
1859
static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1860
{
1861
    RTSPState *rt = s->priv_data;
1862
    int ret, len;
1863
    uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1864
    RTSPStream *rtsp_st;
1865

    
1866
    /* get next frames from the same RTP packet */
1867
    if (rt->cur_transport_priv) {
1868
        if (rt->transport == RTSP_TRANSPORT_RDT) {
1869
            ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1870
        } else
1871
            ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1872
        if (ret == 0) {
1873
            rt->cur_transport_priv = NULL;
1874
            return 0;
1875
        } else if (ret == 1) {
1876
            return 0;
1877
        } else
1878
            rt->cur_transport_priv = NULL;
1879
    }
1880

    
1881
    /* read next RTP packet */
1882
 redo:
1883
    switch(rt->lower_transport) {
1884
    default:
1885
#if CONFIG_RTSP_DEMUXER
1886
    case RTSP_LOWER_TRANSPORT_TCP:
1887
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1888
        break;
1889
#endif
1890
    case RTSP_LOWER_TRANSPORT_UDP:
1891
    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1892
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1893
        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1894
            rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1895
        break;
1896
    }
1897
    if (len < 0)
1898
        return len;
1899
    if (len == 0)
1900
        return AVERROR_EOF;
1901
    if (rt->transport == RTSP_TRANSPORT_RDT) {
1902
        ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1903
    } else {
1904
        ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1905
        if (ret < 0) {
1906
            /* Either bad packet, or a RTCP packet. Check if the
1907
             * first_rtcp_ntp_time field was initialized. */
1908
            RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1909
            if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
1910
                /* first_rtcp_ntp_time has been initialized for this stream,
1911
                 * copy the same value to all other uninitialized streams,
1912
                 * in order to map their timestamp origin to the same ntp time
1913
                 * as this one. */
1914
                int i;
1915
                for (i = 0; i < rt->nb_rtsp_streams; i++) {
1916
                    RTPDemuxContext *rtpctx2 = rtsp_st->transport_priv;
1917
                    if (rtpctx2 &&
1918
                        rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE)
1919
                        rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
1920
                }
1921
            }
1922
        }
1923
    }
1924
    if (ret < 0)
1925
        goto redo;
1926
    if (ret == 1)
1927
        /* more packets may follow, so we save the RTP context */
1928
        rt->cur_transport_priv = rtsp_st->transport_priv;
1929

    
1930
    return ret;
1931
}
1932

    
1933
static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1934
{
1935
    RTSPState *rt = s->priv_data;
1936
    int ret;
1937
    RTSPMessageHeader reply1, *reply = &reply1;
1938
    char cmd[1024];
1939

    
1940
    if (rt->server_type == RTSP_SERVER_REAL) {
1941
        int i;
1942
        enum AVDiscard cache[MAX_STREAMS];
1943

    
1944
        for (i = 0; i < s->nb_streams; i++)
1945
            cache[i] = s->streams[i]->discard;
1946

    
1947
        if (!rt->need_subscription) {
1948
            if (memcmp (cache, rt->real_setup_cache,
1949
                        sizeof(enum AVDiscard) * s->nb_streams)) {
1950
                snprintf(cmd, sizeof(cmd),
1951
                         "Unsubscribe: %s\r\n",
1952
                         rt->last_subscription);
1953
                ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1954
                                 cmd, reply, NULL);
1955
                if (reply->status_code != RTSP_STATUS_OK)
1956
                    return AVERROR_INVALIDDATA;
1957
                rt->need_subscription = 1;
1958
            }
1959
        }
1960

    
1961
        if (rt->need_subscription) {
1962
            int r, rule_nr, first = 1;
1963

    
1964
            memcpy(rt->real_setup_cache, cache,
1965
                   sizeof(enum AVDiscard) * s->nb_streams);
1966
            rt->last_subscription[0] = 0;
1967

    
1968
            snprintf(cmd, sizeof(cmd),
1969
                     "Subscribe: ");
1970
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1971
                rule_nr = 0;
1972
                for (r = 0; r < s->nb_streams; r++) {
1973
                    if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1974
                        if (s->streams[r]->discard != AVDISCARD_ALL) {
1975
                            if (!first)
1976
                                av_strlcat(rt->last_subscription, ",",
1977
                                           sizeof(rt->last_subscription));
1978
                            ff_rdt_subscribe_rule(
1979
                                rt->last_subscription,
1980
                                sizeof(rt->last_subscription), i, rule_nr);
1981
                            first = 0;
1982
                        }
1983
                        rule_nr++;
1984
                    }
1985
                }
1986
            }
1987
            av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1988
            ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1989
                             cmd, reply, NULL);
1990
            if (reply->status_code != RTSP_STATUS_OK)
1991
                return AVERROR_INVALIDDATA;
1992
            rt->need_subscription = 0;
1993

    
1994
            if (rt->state == RTSP_STATE_STREAMING)
1995
                rtsp_read_play (s);
1996
        }
1997
    }
1998

    
1999
    ret = rtsp_fetch_packet(s, pkt);
2000
    if (ret < 0)
2001
        return ret;
2002

    
2003
    /* send dummy request to keep TCP connection alive */
2004
    if ((rt->server_type == RTSP_SERVER_WMS ||
2005
         rt->server_type == RTSP_SERVER_REAL) &&
2006
        (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
2007
        if (rt->server_type == RTSP_SERVER_WMS) {
2008
            ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
2009
        } else {
2010
            ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
2011
        }
2012
    }
2013

    
2014
    return 0;
2015
}
2016

    
2017
/* pause the stream */
2018
static int rtsp_read_pause(AVFormatContext *s)
2019
{
2020
    RTSPState *rt = s->priv_data;
2021
    RTSPMessageHeader reply1, *reply = &reply1;
2022

    
2023
    if (rt->state != RTSP_STATE_STREAMING)
2024
        return 0;
2025
    else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
2026
        ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
2027
        if (reply->status_code != RTSP_STATUS_OK) {
2028
            return -1;
2029
        }
2030
    }
2031
    rt->state = RTSP_STATE_PAUSED;
2032
    return 0;
2033
}
2034

    
2035
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
2036
                          int64_t timestamp, int flags)
2037
{
2038
    RTSPState *rt = s->priv_data;
2039

    
2040
    rt->seek_timestamp = av_rescale_q(timestamp,
2041
                                      s->streams[stream_index]->time_base,
2042
                                      AV_TIME_BASE_Q);
2043
    switch(rt->state) {
2044
    default:
2045
    case RTSP_STATE_IDLE:
2046
        break;
2047
    case RTSP_STATE_STREAMING:
2048
        if (rtsp_read_pause(s) != 0)
2049
            return -1;
2050
        rt->state = RTSP_STATE_SEEKING;
2051
        if (rtsp_read_play(s) != 0)
2052
            return -1;
2053
        break;
2054
    case RTSP_STATE_PAUSED:
2055
        rt->state = RTSP_STATE_IDLE;
2056
        break;
2057
    }
2058
    return 0;
2059
}
2060

    
2061
static int rtsp_read_close(AVFormatContext *s)
2062
{
2063
    RTSPState *rt = s->priv_data;
2064

    
2065
#if 0
2066
    /* NOTE: it is valid to flush the buffer here */
2067
    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
2068
        url_fclose(&rt->rtsp_gb);
2069
    }
2070
#endif
2071
    ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
2072

    
2073
    ff_rtsp_close_streams(s);
2074
    ff_rtsp_close_connections(s);
2075
    ff_network_close();
2076
    return 0;
2077
}
2078

    
2079
AVInputFormat rtsp_demuxer = {
2080
    "rtsp",
2081
    NULL_IF_CONFIG_SMALL("RTSP input format"),
2082
    sizeof(RTSPState),
2083
    rtsp_probe,
2084
    rtsp_read_header,
2085
    rtsp_read_packet,
2086
    rtsp_read_close,
2087
    rtsp_read_seek,
2088
    .flags = AVFMT_NOFILE,
2089
    .read_play = rtsp_read_play,
2090
    .read_pause = rtsp_read_pause,
2091
};
2092
#endif
2093

    
2094
static int sdp_probe(AVProbeData *p1)
2095
{
2096
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
2097

    
2098
    /* we look for a line beginning "c=IN IP4" */
2099
    while (p < p_end && *p != '\0') {
2100
        if (p + sizeof("c=IN IP4") - 1 < p_end &&
2101
            av_strstart(p, "c=IN IP4", NULL))
2102
            return AVPROBE_SCORE_MAX / 2;
2103

    
2104
        while (p < p_end - 1 && *p != '\n') p++;
2105
        if (++p >= p_end)
2106
            break;
2107
        if (*p == '\r')
2108
            p++;
2109
    }
2110
    return 0;
2111
}
2112

    
2113
#define SDP_MAX_SIZE 8192
2114

    
2115
static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
2116
{
2117
    RTSPState *rt = s->priv_data;
2118
    RTSPStream *rtsp_st;
2119
    int size, i, err;
2120
    char *content;
2121
    char url[1024];
2122

    
2123
    if (!ff_network_init())
2124
        return AVERROR(EIO);
2125

    
2126
    /* read the whole sdp file */
2127
    /* XXX: better loading */
2128
    content = av_malloc(SDP_MAX_SIZE);
2129
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
2130
    if (size <= 0) {
2131
        av_free(content);
2132
        return AVERROR_INVALIDDATA;
2133
    }
2134
    content[size] ='\0';
2135

    
2136
    sdp_parse(s, content);
2137
    av_free(content);
2138

    
2139
    /* open each RTP stream */
2140
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
2141
        rtsp_st = rt->rtsp_streams[i];
2142

    
2143
        ff_url_join(url, sizeof(url), "rtp", NULL,
2144
                    inet_ntoa(rtsp_st->sdp_ip), rtsp_st->sdp_port,
2145
                    "?localport=%d&ttl=%d", rtsp_st->sdp_port,
2146
                    rtsp_st->sdp_ttl);
2147
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
2148
            err = AVERROR_INVALIDDATA;
2149
            goto fail;
2150
        }
2151
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
2152
            goto fail;
2153
    }
2154
    return 0;
2155
fail:
2156
    ff_rtsp_close_streams(s);
2157
    ff_network_close();
2158
    return err;
2159
}
2160

    
2161
static int sdp_read_close(AVFormatContext *s)
2162
{
2163
    ff_rtsp_close_streams(s);
2164
    ff_network_close();
2165
    return 0;
2166
}
2167

    
2168
AVInputFormat sdp_demuxer = {
2169
    "sdp",
2170
    NULL_IF_CONFIG_SMALL("SDP"),
2171
    sizeof(RTSPState),
2172
    sdp_probe,
2173
    sdp_read_header,
2174
    rtsp_fetch_packet,
2175
    sdp_read_close,
2176
};