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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
9
 * 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.
16
 *
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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"
24
#include "libavutil/intreadwrite.h"
25
#include "libavutil/random_seed.h"
26
#include "avformat.h"
27

    
28
#include <sys/time.h>
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#if HAVE_SYS_SELECT_H
30
#include <sys/select.h>
31
#endif
32
#include <strings.h>
33
#include "internal.h"
34
#include "network.h"
35
#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
44
//#define DEBUG_RTP_TCP
45

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

    
50
/* Timeout values for socket select, in ms,
51
 * and read_packet(), in seconds  */
52
#define SELECT_TIMEOUT_MS 100
53
#define READ_PACKET_TIMEOUT_S 10
54
#define MAX_TIMEOUTS READ_PACKET_TIMEOUT_S * 1000 / SELECT_TIMEOUT_MS
55

    
56
static void get_word_until_chars(char *buf, int buf_size,
57
                                 const char *sep, const char **pp)
58
{
59
    const char *p;
60
    char *q;
61

    
62
    p = *pp;
63
    p += strspn(p, SPACE_CHARS);
64
    q = buf;
65
    while (!strchr(sep, *p) && *p != '\0') {
66
        if ((q - buf) < buf_size - 1)
67
            *q++ = *p;
68
        p++;
69
    }
70
    if (buf_size > 0)
71
        *q = '\0';
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    *pp = p;
73
}
74

    
75
static void get_word_sep(char *buf, int buf_size, const char *sep,
76
                         const char **pp)
77
{
78
    if (**pp == '/') (*pp)++;
79
    get_word_until_chars(buf, buf_size, sep, pp);
80
}
81

    
82
static void get_word(char *buf, int buf_size, const char **pp)
83
{
84
    get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
85
}
86

    
87
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
88
static int sdp_parse_rtpmap(AVFormatContext *s,
89
                            AVCodecContext *codec, RTSPStream *rtsp_st,
90
                            int payload_type, const char *p)
91
{
92
    char buf[256];
93
    int i;
94
    AVCodec *c;
95
    const char *c_name;
96

    
97
    /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
98
     * see if we can handle this kind of payload.
99
     * The space should normally not be there but some Real streams or
100
     * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
101
     * have a trailing space. */
102
    get_word_sep(buf, sizeof(buf), "/ ", &p);
103
    if (payload_type >= RTP_PT_PRIVATE) {
104
        RTPDynamicProtocolHandler *handler;
105
        for (handler = RTPFirstDynamicPayloadHandler;
106
             handler; handler = handler->next) {
107
            if (!strcasecmp(buf, handler->enc_name) &&
108
                codec->codec_type == handler->codec_type) {
109
                codec->codec_id          = handler->codec_id;
110
                rtsp_st->dynamic_handler = handler;
111
                if (handler->open)
112
                    rtsp_st->dynamic_protocol_context = handler->open();
113
                break;
114
            }
115
        }
116
    } else {
117
        /* We are in a standard case
118
         * (from http://www.iana.org/assignments/rtp-parameters). */
119
        /* search into AVRtpPayloadTypes[] */
120
        codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
121
    }
122

    
123
    c = avcodec_find_decoder(codec->codec_id);
124
    if (c && c->name)
125
        c_name = c->name;
126
    else
127
        c_name = "(null)";
128

    
129
    get_word_sep(buf, sizeof(buf), "/", &p);
130
    i = atoi(buf);
131
    switch (codec->codec_type) {
132
    case AVMEDIA_TYPE_AUDIO:
133
        av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
134
        codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
135
        codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
136
        if (i > 0) {
137
            codec->sample_rate = i;
138
            get_word_sep(buf, sizeof(buf), "/", &p);
139
            i = atoi(buf);
140
            if (i > 0)
141
                codec->channels = i;
142
            // TODO: there is a bug here; if it is a mono stream, and
143
            // less than 22000Hz, faad upconverts to stereo and twice
144
            // the frequency.  No problem, but the sample rate is being
145
            // set here by the sdp line. Patch on its way. (rdm)
146
        }
147
        av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
148
               codec->sample_rate);
149
        av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
150
               codec->channels);
151
        break;
152
    case AVMEDIA_TYPE_VIDEO:
153
        av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
154
        break;
155
    default:
156
        break;
157
    }
158
    return 0;
159
}
160

    
161
/* parse the attribute line from the fmtp a line of an sdp response. This
162
 * is broken out as a function because it is used in rtp_h264.c, which is
163
 * forthcoming. */
164
int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
165
                                char *value, int value_size)
166
{
167
    *p += strspn(*p, SPACE_CHARS);
168
    if (**p) {
169
        get_word_sep(attr, attr_size, "=", p);
170
        if (**p == '=')
171
            (*p)++;
172
        get_word_sep(value, value_size, ";", p);
173
        if (**p == ';')
174
            (*p)++;
175
        return 1;
176
    }
177
    return 0;
178
}
179

    
180
/** Parse a string p in the form of Range:npt=xx-xx, and determine the start
181
 *  and end time.
182
 *  Used for seeking in the rtp stream.
183
 */
184
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
185
{
186
    char buf[256];
187

    
188
    p += strspn(p, SPACE_CHARS);
189
    if (!av_stristart(p, "npt=", &p))
190
        return;
191

    
192
    *start = AV_NOPTS_VALUE;
193
    *end = AV_NOPTS_VALUE;
194

    
195
    get_word_sep(buf, sizeof(buf), "-", &p);
196
    *start = parse_date(buf, 1);
197
    if (*p == '-') {
198
        p++;
199
        get_word_sep(buf, sizeof(buf), "-", &p);
200
        *end = parse_date(buf, 1);
201
    }
202
//    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
203
//    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
204
}
205

    
206
typedef struct SDPParseState {
207
    /* SDP only */
208
    struct in_addr default_ip;
209
    int            default_ttl;
210
    int            skip_media;  ///< set if an unknown m= line occurs
211
} SDPParseState;
212

    
213
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
214
                           int letter, const char *buf)
215
{
216
    RTSPState *rt = s->priv_data;
217
    char buf1[64], st_type[64];
218
    const char *p;
219
    enum AVMediaType codec_type;
220
    int payload_type, i;
221
    AVStream *st;
222
    RTSPStream *rtsp_st;
223
    struct in_addr sdp_ip;
224
    int ttl;
225

    
226
    dprintf(s, "sdp: %c='%s'\n", letter, buf);
227

    
228
    p = buf;
229
    if (s1->skip_media && letter != 'm')
230
        return;
231
    switch (letter) {
232
    case 'c':
233
        get_word(buf1, sizeof(buf1), &p);
234
        if (strcmp(buf1, "IN") != 0)
235
            return;
236
        get_word(buf1, sizeof(buf1), &p);
237
        if (strcmp(buf1, "IP4") != 0)
238
            return;
239
        get_word_sep(buf1, sizeof(buf1), "/", &p);
240
        if (ff_inet_aton(buf1, &sdp_ip) == 0)
241
            return;
242
        ttl = 16;
243
        if (*p == '/') {
244
            p++;
245
            get_word_sep(buf1, sizeof(buf1), "/", &p);
246
            ttl = atoi(buf1);
247
        }
248
        if (s->nb_streams == 0) {
249
            s1->default_ip = sdp_ip;
250
            s1->default_ttl = ttl;
251
        } else {
252
            st = s->streams[s->nb_streams - 1];
253
            rtsp_st = st->priv_data;
254
            rtsp_st->sdp_ip = sdp_ip;
255
            rtsp_st->sdp_ttl = ttl;
256
        }
257
        break;
258
    case 's':
259
        av_metadata_set2(&s->metadata, "title", p, 0);
260
        break;
261
    case 'i':
262
        if (s->nb_streams == 0) {
263
            av_metadata_set2(&s->metadata, "comment", p, 0);
264
            break;
265
        }
266
        break;
267
    case 'm':
268
        /* new stream */
269
        s1->skip_media = 0;
270
        get_word(st_type, sizeof(st_type), &p);
271
        if (!strcmp(st_type, "audio")) {
272
            codec_type = AVMEDIA_TYPE_AUDIO;
273
        } else if (!strcmp(st_type, "video")) {
274
            codec_type = AVMEDIA_TYPE_VIDEO;
275
        } else if (!strcmp(st_type, "application")) {
276
            codec_type = AVMEDIA_TYPE_DATA;
277
        } else {
278
            s1->skip_media = 1;
279
            return;
280
        }
281
        rtsp_st = av_mallocz(sizeof(RTSPStream));
282
        if (!rtsp_st)
283
            return;
284
        rtsp_st->stream_index = -1;
285
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
286

    
287
        rtsp_st->sdp_ip = s1->default_ip;
288
        rtsp_st->sdp_ttl = s1->default_ttl;
289

    
290
        get_word(buf1, sizeof(buf1), &p); /* port */
291
        rtsp_st->sdp_port = atoi(buf1);
292

    
293
        get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
294

    
295
        /* XXX: handle list of formats */
296
        get_word(buf1, sizeof(buf1), &p); /* format list */
297
        rtsp_st->sdp_payload_type = atoi(buf1);
298

    
299
        if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
300
            /* no corresponding stream */
301
        } else {
302
            st = av_new_stream(s, 0);
303
            if (!st)
304
                return;
305
            st->priv_data = rtsp_st;
306
            rtsp_st->stream_index = st->index;
307
            st->codec->codec_type = codec_type;
308
            if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
309
                /* if standard payload type, we can find the codec right now */
310
                ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
311
            }
312
        }
313
        /* put a default control url */
314
        av_strlcpy(rtsp_st->control_url, rt->control_uri,
315
                   sizeof(rtsp_st->control_url));
316
        break;
317
    case 'a':
318
        if (av_strstart(p, "control:", &p)) {
319
            if (s->nb_streams == 0) {
320
                if (!strncmp(p, "rtsp://", 7))
321
                    av_strlcpy(rt->control_uri, p,
322
                               sizeof(rt->control_uri));
323
            } else {
324
            char proto[32];
325
            /* get the control url */
326
            st = s->streams[s->nb_streams - 1];
327
            rtsp_st = st->priv_data;
328

    
329
            /* XXX: may need to add full url resolution */
330
            av_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
331
                         NULL, NULL, 0, p);
332
            if (proto[0] == '\0') {
333
                /* relative control URL */
334
                if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
335
                av_strlcat(rtsp_st->control_url, "/",
336
                           sizeof(rtsp_st->control_url));
337
                av_strlcat(rtsp_st->control_url, p,
338
                           sizeof(rtsp_st->control_url));
339
            } else
340
                av_strlcpy(rtsp_st->control_url, p,
341
                           sizeof(rtsp_st->control_url));
342
            }
343
        } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
344
            /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
345
            get_word(buf1, sizeof(buf1), &p);
346
            payload_type = atoi(buf1);
347
            st = s->streams[s->nb_streams - 1];
348
            rtsp_st = st->priv_data;
349
            sdp_parse_rtpmap(s, st->codec, rtsp_st, payload_type, p);
350
        } else if (av_strstart(p, "fmtp:", &p) ||
351
                   av_strstart(p, "framesize:", &p)) {
352
            /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
353
            // let dynamic protocol handlers have a stab at the line.
354
            get_word(buf1, sizeof(buf1), &p);
355
            payload_type = atoi(buf1);
356
            for (i = 0; i < s->nb_streams; i++) {
357
                st      = s->streams[i];
358
                rtsp_st = st->priv_data;
359
                if (rtsp_st->sdp_payload_type == payload_type &&
360
                    rtsp_st->dynamic_handler &&
361
                    rtsp_st->dynamic_handler->parse_sdp_a_line)
362
                    rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
363
                        rtsp_st->dynamic_protocol_context, buf);
364
            }
365
        } else if (av_strstart(p, "range:", &p)) {
366
            int64_t start, end;
367

    
368
            // this is so that seeking on a streamed file can work.
369
            rtsp_parse_range_npt(p, &start, &end);
370
            s->start_time = start;
371
            /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
372
            s->duration   = (end == AV_NOPTS_VALUE) ?
373
                            AV_NOPTS_VALUE : end - start;
374
        } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
375
            if (atoi(p) == 1)
376
                rt->transport = RTSP_TRANSPORT_RDT;
377
        } else {
378
            if (rt->server_type == RTSP_SERVER_WMS)
379
                ff_wms_parse_sdp_a_line(s, p);
380
            if (s->nb_streams > 0) {
381
                if (rt->server_type == RTSP_SERVER_REAL)
382
                    ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
383

    
384
                rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
385
                if (rtsp_st->dynamic_handler &&
386
                    rtsp_st->dynamic_handler->parse_sdp_a_line)
387
                    rtsp_st->dynamic_handler->parse_sdp_a_line(s,
388
                        s->nb_streams - 1,
389
                        rtsp_st->dynamic_protocol_context, buf);
390
            }
391
        }
392
        break;
393
    }
394
}
395

    
396
static int sdp_parse(AVFormatContext *s, const char *content)
397
{
398
    const char *p;
399
    int letter;
400
    /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
401
     * contain long SDP lines containing complete ASF Headers (several
402
     * kB) or arrays of MDPR (RM stream descriptor) headers plus
403
     * "rulebooks" describing their properties. Therefore, the SDP line
404
     * buffer is large.
405
     *
406
     * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
407
     * in rtpdec_xiph.c. */
408
    char buf[16384], *q;
409
    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
410

    
411
    memset(s1, 0, sizeof(SDPParseState));
412
    p = content;
413
    for (;;) {
414
        p += strspn(p, SPACE_CHARS);
415
        letter = *p;
416
        if (letter == '\0')
417
            break;
418
        p++;
419
        if (*p != '=')
420
            goto next_line;
421
        p++;
422
        /* get the content */
423
        q = buf;
424
        while (*p != '\n' && *p != '\r' && *p != '\0') {
425
            if ((q - buf) < sizeof(buf) - 1)
426
                *q++ = *p;
427
            p++;
428
        }
429
        *q = '\0';
430
        sdp_parse_line(s, s1, letter, buf);
431
    next_line:
432
        while (*p != '\n' && *p != '\0')
433
            p++;
434
        if (*p == '\n')
435
            p++;
436
    }
437
    return 0;
438
}
439

    
440
/* close and free RTSP streams */
441
void ff_rtsp_close_streams(AVFormatContext *s)
442
{
443
    RTSPState *rt = s->priv_data;
444
    int i;
445
    RTSPStream *rtsp_st;
446

    
447
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
448
        rtsp_st = rt->rtsp_streams[i];
449
        if (rtsp_st) {
450
            if (rtsp_st->transport_priv) {
451
                if (s->oformat) {
452
                    AVFormatContext *rtpctx = rtsp_st->transport_priv;
453
                    av_write_trailer(rtpctx);
454
                    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
455
                        uint8_t *ptr;
456
                        url_close_dyn_buf(rtpctx->pb, &ptr);
457
                        av_free(ptr);
458
                    } else {
459
                        url_fclose(rtpctx->pb);
460
                    }
461
                    av_metadata_free(&rtpctx->streams[0]->metadata);
462
                    av_metadata_free(&rtpctx->metadata);
463
                    av_free(rtpctx->streams[0]);
464
                    av_free(rtpctx);
465
                } else if (rt->transport == RTSP_TRANSPORT_RDT)
466
                    ff_rdt_parse_close(rtsp_st->transport_priv);
467
                else
468
                    rtp_parse_close(rtsp_st->transport_priv);
469
            }
470
            if (rtsp_st->rtp_handle)
471
                url_close(rtsp_st->rtp_handle);
472
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
473
                rtsp_st->dynamic_handler->close(
474
                    rtsp_st->dynamic_protocol_context);
475
        }
476
    }
477
    av_free(rt->rtsp_streams);
478
    if (rt->asf_ctx) {
479
        av_close_input_stream (rt->asf_ctx);
480
        rt->asf_ctx = NULL;
481
    }
482
}
483

    
484
static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st,
485
                               URLContext *handle)
486
{
487
    RTSPState *rt = s->priv_data;
488
    AVFormatContext *rtpctx;
489
    int ret;
490
    AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
491

    
492
    if (!rtp_format)
493
        return NULL;
494

    
495
    /* Allocate an AVFormatContext for each output stream */
496
    rtpctx = avformat_alloc_context();
497
    if (!rtpctx)
498
        return NULL;
499

    
500
    rtpctx->oformat = rtp_format;
501
    if (!av_new_stream(rtpctx, 0)) {
502
        av_free(rtpctx);
503
        return NULL;
504
    }
505
    /* Copy the max delay setting; the rtp muxer reads this. */
506
    rtpctx->max_delay = s->max_delay;
507
    /* Copy other stream parameters. */
508
    rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
509

    
510
    /* Set the synchronized start time. */
511
    rtpctx->start_time_realtime = rt->start_time;
512

    
513
    /* Remove the local codec, link to the original codec
514
     * context instead, to give the rtp muxer access to
515
     * codec parameters. */
516
    av_free(rtpctx->streams[0]->codec);
517
    rtpctx->streams[0]->codec = st->codec;
518

    
519
    if (handle) {
520
        url_fdopen(&rtpctx->pb, handle);
521
    } else
522
        url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
523
    ret = av_write_header(rtpctx);
524

    
525
    if (ret) {
526
        if (handle) {
527
            url_fclose(rtpctx->pb);
528
        } else {
529
            uint8_t *ptr;
530
            url_close_dyn_buf(rtpctx->pb, &ptr);
531
            av_free(ptr);
532
        }
533
        av_free(rtpctx->streams[0]);
534
        av_free(rtpctx);
535
        return NULL;
536
    }
537

    
538
    /* Copy the RTP AVStream timebase back to the original AVStream */
539
    st->time_base = rtpctx->streams[0]->time_base;
540
    return rtpctx;
541
}
542

    
543
static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
544
{
545
    RTSPState *rt = s->priv_data;
546
    AVStream *st = NULL;
547

    
548
    /* open the RTP context */
549
    if (rtsp_st->stream_index >= 0)
550
        st = s->streams[rtsp_st->stream_index];
551
    if (!st)
552
        s->ctx_flags |= AVFMTCTX_NOHEADER;
553

    
554
    if (s->oformat) {
555
        rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
556
        /* Ownership of rtp_handle is passed to the rtp mux context */
557
        rtsp_st->rtp_handle = NULL;
558
    } else if (rt->transport == RTSP_TRANSPORT_RDT)
559
        rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
560
                                            rtsp_st->dynamic_protocol_context,
561
                                            rtsp_st->dynamic_handler);
562
    else
563
        rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
564
                                         rtsp_st->sdp_payload_type);
565

    
566
    if (!rtsp_st->transport_priv) {
567
         return AVERROR(ENOMEM);
568
    } else if (rt->transport != RTSP_TRANSPORT_RDT) {
569
        if (rtsp_st->dynamic_handler) {
570
            rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
571
                                           rtsp_st->dynamic_protocol_context,
572
                                           rtsp_st->dynamic_handler);
573
        }
574
    }
575

    
576
    return 0;
577
}
578

    
579
#if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
580
static int rtsp_probe(AVProbeData *p)
581
{
582
    if (av_strstart(p->filename, "rtsp:", NULL))
583
        return AVPROBE_SCORE_MAX;
584
    return 0;
585
}
586

    
587
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
588
{
589
    const char *p;
590
    int v;
591

    
592
    p = *pp;
593
    p += strspn(p, SPACE_CHARS);
594
    v = strtol(p, (char **)&p, 10);
595
    if (*p == '-') {
596
        p++;
597
        *min_ptr = v;
598
        v = strtol(p, (char **)&p, 10);
599
        *max_ptr = v;
600
    } else {
601
        *min_ptr = v;
602
        *max_ptr = v;
603
    }
604
    *pp = p;
605
}
606

    
607
/* XXX: only one transport specification is parsed */
608
static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
609
{
610
    char transport_protocol[16];
611
    char profile[16];
612
    char lower_transport[16];
613
    char parameter[16];
614
    RTSPTransportField *th;
615
    char buf[256];
616

    
617
    reply->nb_transports = 0;
618

    
619
    for (;;) {
620
        p += strspn(p, SPACE_CHARS);
621
        if (*p == '\0')
622
            break;
623

    
624
        th = &reply->transports[reply->nb_transports];
625

    
626
        get_word_sep(transport_protocol, sizeof(transport_protocol),
627
                     "/", &p);
628
        if (!strcasecmp (transport_protocol, "rtp")) {
629
            get_word_sep(profile, sizeof(profile), "/;,", &p);
630
            lower_transport[0] = '\0';
631
            /* rtp/avp/<protocol> */
632
            if (*p == '/') {
633
                get_word_sep(lower_transport, sizeof(lower_transport),
634
                             ";,", &p);
635
            }
636
            th->transport = RTSP_TRANSPORT_RTP;
637
        } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
638
                   !strcasecmp (transport_protocol, "x-real-rdt")) {
639
            /* x-pn-tng/<protocol> */
640
            get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
641
            profile[0] = '\0';
642
            th->transport = RTSP_TRANSPORT_RDT;
643
        }
644
        if (!strcasecmp(lower_transport, "TCP"))
645
            th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
646
        else
647
            th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
648

    
649
        if (*p == ';')
650
            p++;
651
        /* get each parameter */
652
        while (*p != '\0' && *p != ',') {
653
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
654
            if (!strcmp(parameter, "port")) {
655
                if (*p == '=') {
656
                    p++;
657
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
658
                }
659
            } else if (!strcmp(parameter, "client_port")) {
660
                if (*p == '=') {
661
                    p++;
662
                    rtsp_parse_range(&th->client_port_min,
663
                                     &th->client_port_max, &p);
664
                }
665
            } else if (!strcmp(parameter, "server_port")) {
666
                if (*p == '=') {
667
                    p++;
668
                    rtsp_parse_range(&th->server_port_min,
669
                                     &th->server_port_max, &p);
670
                }
671
            } else if (!strcmp(parameter, "interleaved")) {
672
                if (*p == '=') {
673
                    p++;
674
                    rtsp_parse_range(&th->interleaved_min,
675
                                     &th->interleaved_max, &p);
676
                }
677
            } else if (!strcmp(parameter, "multicast")) {
678
                if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
679
                    th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
680
            } else if (!strcmp(parameter, "ttl")) {
681
                if (*p == '=') {
682
                    p++;
683
                    th->ttl = strtol(p, (char **)&p, 10);
684
                }
685
            } else if (!strcmp(parameter, "destination")) {
686
                struct in_addr ipaddr;
687

    
688
                if (*p == '=') {
689
                    p++;
690
                    get_word_sep(buf, sizeof(buf), ";,", &p);
691
                    if (ff_inet_aton(buf, &ipaddr))
692
                        th->destination = ntohl(ipaddr.s_addr);
693
                }
694
            }
695
            while (*p != ';' && *p != '\0' && *p != ',')
696
                p++;
697
            if (*p == ';')
698
                p++;
699
        }
700
        if (*p == ',')
701
            p++;
702

    
703
        reply->nb_transports++;
704
    }
705
}
706

    
707
void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
708
                        HTTPAuthState *auth_state)
709
{
710
    const char *p;
711

    
712
    /* NOTE: we do case independent match for broken servers */
713
    p = buf;
714
    if (av_stristart(p, "Session:", &p)) {
715
        int t;
716
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
717
        if (av_stristart(p, ";timeout=", &p) &&
718
            (t = strtol(p, NULL, 10)) > 0) {
719
            reply->timeout = t;
720
        }
721
    } else if (av_stristart(p, "Content-Length:", &p)) {
722
        reply->content_length = strtol(p, NULL, 10);
723
    } else if (av_stristart(p, "Transport:", &p)) {
724
        rtsp_parse_transport(reply, p);
725
    } else if (av_stristart(p, "CSeq:", &p)) {
726
        reply->seq = strtol(p, NULL, 10);
727
    } else if (av_stristart(p, "Range:", &p)) {
728
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
729
    } else if (av_stristart(p, "RealChallenge1:", &p)) {
730
        p += strspn(p, SPACE_CHARS);
731
        av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
732
    } else if (av_stristart(p, "Server:", &p)) {
733
        p += strspn(p, SPACE_CHARS);
734
        av_strlcpy(reply->server, p, sizeof(reply->server));
735
    } else if (av_stristart(p, "Notice:", &p) ||
736
               av_stristart(p, "X-Notice:", &p)) {
737
        reply->notice = strtol(p, NULL, 10);
738
    } else if (av_stristart(p, "Location:", &p)) {
739
        p += strspn(p, SPACE_CHARS);
740
        av_strlcpy(reply->location, p , sizeof(reply->location));
741
    } else if (av_stristart(p, "WWW-Authenticate:", &p) && auth_state) {
742
        p += strspn(p, SPACE_CHARS);
743
        ff_http_auth_handle_header(auth_state, "WWW-Authenticate", p);
744
    } else if (av_stristart(p, "Authentication-Info:", &p) && auth_state) {
745
        p += strspn(p, SPACE_CHARS);
746
        ff_http_auth_handle_header(auth_state, "Authentication-Info", p);
747
    }
748
}
749

    
750
/* skip a RTP/TCP interleaved packet */
751
void ff_rtsp_skip_packet(AVFormatContext *s)
752
{
753
    RTSPState *rt = s->priv_data;
754
    int ret, len, len1;
755
    uint8_t buf[1024];
756

    
757
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
758
    if (ret != 3)
759
        return;
760
    len = AV_RB16(buf + 1);
761

    
762
    dprintf(s, "skipping RTP packet len=%d\n", len);
763

    
764
    /* skip payload */
765
    while (len > 0) {
766
        len1 = len;
767
        if (len1 > sizeof(buf))
768
            len1 = sizeof(buf);
769
        ret = url_read_complete(rt->rtsp_hd, buf, len1);
770
        if (ret != len1)
771
            return;
772
        len -= len1;
773
    }
774
}
775

    
776
int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
777
                       unsigned char **content_ptr,
778
                       int return_on_interleaved_data)
779
{
780
    RTSPState *rt = s->priv_data;
781
    char buf[4096], buf1[1024], *q;
782
    unsigned char ch;
783
    const char *p;
784
    int ret, content_length, line_count = 0;
785
    unsigned char *content = NULL;
786

    
787
    memset(reply, 0, sizeof(*reply));
788

    
789
    /* parse reply (XXX: use buffers) */
790
    rt->last_reply[0] = '\0';
791
    for (;;) {
792
        q = buf;
793
        for (;;) {
794
            ret = url_read_complete(rt->rtsp_hd, &ch, 1);
795
#ifdef DEBUG_RTP_TCP
796
            dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
797
#endif
798
            if (ret != 1)
799
                return -1;
800
            if (ch == '\n')
801
                break;
802
            if (ch == '$') {
803
                /* XXX: only parse it if first char on line ? */
804
                if (return_on_interleaved_data) {
805
                    return 1;
806
                } else
807
                    ff_rtsp_skip_packet(s);
808
            } else if (ch != '\r') {
809
                if ((q - buf) < sizeof(buf) - 1)
810
                    *q++ = ch;
811
            }
812
        }
813
        *q = '\0';
814

    
815
        dprintf(s, "line='%s'\n", buf);
816

    
817
        /* test if last line */
818
        if (buf[0] == '\0')
819
            break;
820
        p = buf;
821
        if (line_count == 0) {
822
            /* get reply code */
823
            get_word(buf1, sizeof(buf1), &p);
824
            get_word(buf1, sizeof(buf1), &p);
825
            reply->status_code = atoi(buf1);
826
        } else {
827
            ff_rtsp_parse_line(reply, p, &rt->auth_state);
828
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
829
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
830
        }
831
        line_count++;
832
    }
833

    
834
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
835
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
836

    
837
    content_length = reply->content_length;
838
    if (content_length > 0) {
839
        /* leave some room for a trailing '\0' (useful for simple parsing) */
840
        content = av_malloc(content_length + 1);
841
        (void)url_read_complete(rt->rtsp_hd, content, content_length);
842
        content[content_length] = '\0';
843
    }
844
    if (content_ptr)
845
        *content_ptr = content;
846
    else
847
        av_free(content);
848

    
849
    if (rt->seq != reply->seq) {
850
        av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
851
            rt->seq, reply->seq);
852
    }
853

    
854
    /* EOS */
855
    if (reply->notice == 2101 /* End-of-Stream Reached */      ||
856
        reply->notice == 2104 /* Start-of-Stream Reached */    ||
857
        reply->notice == 2306 /* Continuous Feed Terminated */) {
858
        rt->state = RTSP_STATE_IDLE;
859
    } else if (reply->notice >= 4400 && reply->notice < 5500) {
860
        return AVERROR(EIO); /* data or server error */
861
    } else if (reply->notice == 2401 /* Ticket Expired */ ||
862
             (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
863
        return AVERROR(EPERM);
864

    
865
    return 0;
866
}
867

    
868
int ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
869
                                        const char *method, const char *url,
870
                                        const char *headers,
871
                                        const unsigned char *send_content,
872
                                        int send_content_length)
873
{
874
    RTSPState *rt = s->priv_data;
875
    char buf[4096], *out_buf;
876
    char base64buf[AV_BASE64_SIZE(sizeof(buf))];
877

    
878
    /* Add in RTSP headers */
879
    out_buf = buf;
880
    rt->seq++;
881
    snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
882
    if (headers)
883
        av_strlcat(buf, headers, sizeof(buf));
884
    av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
885
    if (rt->session_id[0] != '\0' && (!headers ||
886
        !strstr(headers, "\nIf-Match:"))) {
887
        av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
888
    }
889
    if (rt->auth[0]) {
890
        char *str = ff_http_auth_create_response(&rt->auth_state,
891
                                                 rt->auth, url, method);
892
        if (str)
893
            av_strlcat(buf, str, sizeof(buf));
894
        av_free(str);
895
    }
896
    if (send_content_length > 0 && send_content)
897
        av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
898
    av_strlcat(buf, "\r\n", sizeof(buf));
899

    
900
    /* base64 encode rtsp if tunneling */
901
    if (rt->control_transport == RTSP_MODE_TUNNEL) {
902
        av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
903
        out_buf = base64buf;
904
    }
905

    
906
    dprintf(s, "Sending:\n%s--\n", buf);
907

    
908
    url_write(rt->rtsp_hd_out, out_buf, strlen(out_buf));
909
    if (send_content_length > 0 && send_content) {
910
        if (rt->control_transport == RTSP_MODE_TUNNEL) {
911
            av_log(s, AV_LOG_ERROR, "tunneling of RTSP requests "
912
                                    "with content data not supported\n");
913
            return AVERROR_PATCHWELCOME;
914
        }
915
        url_write(rt->rtsp_hd_out, send_content, send_content_length);
916
    }
917
    rt->last_cmd_time = av_gettime();
918

    
919
    return 0;
920
}
921

    
922
int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
923
                           const char *url, const char *headers)
924
{
925
    return ff_rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
926
}
927

    
928
int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
929
                     const char *headers, RTSPMessageHeader *reply,
930
                     unsigned char **content_ptr)
931
{
932
    return ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
933
                                         content_ptr, NULL, 0);
934
}
935

    
936
int ff_rtsp_send_cmd_with_content(AVFormatContext *s,
937
                                  const char *method, const char *url,
938
                                  const char *header,
939
                                  RTSPMessageHeader *reply,
940
                                  unsigned char **content_ptr,
941
                                  const unsigned char *send_content,
942
                                  int send_content_length)
943
{
944
    RTSPState *rt = s->priv_data;
945
    HTTPAuthType cur_auth_type;
946
    int ret;
947

    
948
retry:
949
    cur_auth_type = rt->auth_state.auth_type;
950
    if ((ret = ff_rtsp_send_cmd_with_content_async(s, method, url, header,
951
                                                   send_content,
952
                                                   send_content_length)))
953
        return ret;
954

    
955
    if ((ret = ff_rtsp_read_reply(s, reply, content_ptr, 0) ) < 0)
956
        return ret;
957

    
958
    if (reply->status_code == 401 && cur_auth_type == HTTP_AUTH_NONE &&
959
        rt->auth_state.auth_type != HTTP_AUTH_NONE)
960
        goto retry;
961

    
962
    return 0;
963
}
964

    
965
/**
966
 * @return 0 on success, <0 on error, 1 if protocol is unavailable.
967
 */
968
static int make_setup_request(AVFormatContext *s, const char *host, int port,
969
                              int lower_transport, const char *real_challenge)
970
{
971
    RTSPState *rt = s->priv_data;
972
    int rtx, j, i, err, interleave = 0;
973
    RTSPStream *rtsp_st;
974
    RTSPMessageHeader reply1, *reply = &reply1;
975
    char cmd[2048];
976
    const char *trans_pref;
977

    
978
    if (rt->transport == RTSP_TRANSPORT_RDT)
979
        trans_pref = "x-pn-tng";
980
    else
981
        trans_pref = "RTP/AVP";
982

    
983
    /* default timeout: 1 minute */
984
    rt->timeout = 60;
985

    
986
    /* for each stream, make the setup request */
987
    /* XXX: we assume the same server is used for the control of each
988
     * RTSP stream */
989

    
990
    for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
991
        char transport[2048];
992

    
993
        /**
994
         * WMS serves all UDP data over a single connection, the RTX, which
995
         * isn't necessarily the first in the SDP but has to be the first
996
         * to be set up, else the second/third SETUP will fail with a 461.
997
         */
998
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
999
             rt->server_type == RTSP_SERVER_WMS) {
1000
            if (i == 0) {
1001
                /* rtx first */
1002
                for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1003
                    int len = strlen(rt->rtsp_streams[rtx]->control_url);
1004
                    if (len >= 4 &&
1005
                        !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1006
                                "/rtx"))
1007
                        break;
1008
                }
1009
                if (rtx == rt->nb_rtsp_streams)
1010
                    return -1; /* no RTX found */
1011
                rtsp_st = rt->rtsp_streams[rtx];
1012
            } else
1013
                rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1014
        } else
1015
            rtsp_st = rt->rtsp_streams[i];
1016

    
1017
        /* RTP/UDP */
1018
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1019
            char buf[256];
1020

    
1021
            if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1022
                port = reply->transports[0].client_port_min;
1023
                goto have_port;
1024
            }
1025

    
1026
            /* first try in specified port range */
1027
            if (RTSP_RTP_PORT_MIN != 0) {
1028
                while (j <= RTSP_RTP_PORT_MAX) {
1029
                    ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1030
                                "?localport=%d", j);
1031
                    /* we will use two ports per rtp stream (rtp and rtcp) */
1032
                    j += 2;
1033
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1034
                        goto rtp_opened;
1035
                }
1036
            }
1037

    
1038
#if 0
1039
            /* then try on any port */
1040
            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1041
                err = AVERROR_INVALIDDATA;
1042
                goto fail;
1043
            }
1044
#endif
1045

    
1046
        rtp_opened:
1047
            port = rtp_get_local_port(rtsp_st->rtp_handle);
1048
        have_port:
1049
            snprintf(transport, sizeof(transport) - 1,
1050
                     "%s/UDP;", trans_pref);
1051
            if (rt->server_type != RTSP_SERVER_REAL)
1052
                av_strlcat(transport, "unicast;", sizeof(transport));
1053
            av_strlcatf(transport, sizeof(transport),
1054
                     "client_port=%d", port);
1055
            if (rt->transport == RTSP_TRANSPORT_RTP &&
1056
                !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1057
                av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1058
        }
1059

    
1060
        /* RTP/TCP */
1061
        else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1062
            /** For WMS streams, the application streams are only used for
1063
             * UDP. When trying to set it up for TCP streams, the server
1064
             * will return an error. Therefore, we skip those streams. */
1065
            if (rt->server_type == RTSP_SERVER_WMS &&
1066
                s->streams[rtsp_st->stream_index]->codec->codec_type ==
1067
                    AVMEDIA_TYPE_DATA)
1068
                continue;
1069
            snprintf(transport, sizeof(transport) - 1,
1070
                     "%s/TCP;", trans_pref);
1071
            if (rt->server_type == RTSP_SERVER_WMS)
1072
                av_strlcat(transport, "unicast;", sizeof(transport));
1073
            av_strlcatf(transport, sizeof(transport),
1074
                        "interleaved=%d-%d",
1075
                        interleave, interleave + 1);
1076
            interleave += 2;
1077
        }
1078

    
1079
        else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1080
            snprintf(transport, sizeof(transport) - 1,
1081
                     "%s/UDP;multicast", trans_pref);
1082
        }
1083
        if (s->oformat) {
1084
            av_strlcat(transport, ";mode=receive", sizeof(transport));
1085
        } else if (rt->server_type == RTSP_SERVER_REAL ||
1086
                   rt->server_type == RTSP_SERVER_WMS)
1087
            av_strlcat(transport, ";mode=play", sizeof(transport));
1088
        snprintf(cmd, sizeof(cmd),
1089
                 "Transport: %s\r\n",
1090
                 transport);
1091
        if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1092
            char real_res[41], real_csum[9];
1093
            ff_rdt_calc_response_and_checksum(real_res, real_csum,
1094
                                              real_challenge);
1095
            av_strlcatf(cmd, sizeof(cmd),
1096
                        "If-Match: %s\r\n"
1097
                        "RealChallenge2: %s, sd=%s\r\n",
1098
                        rt->session_id, real_res, real_csum);
1099
        }
1100
        ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1101
        if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1102
            err = 1;
1103
            goto fail;
1104
        } else if (reply->status_code != RTSP_STATUS_OK ||
1105
                   reply->nb_transports != 1) {
1106
            err = AVERROR_INVALIDDATA;
1107
            goto fail;
1108
        }
1109

    
1110
        /* XXX: same protocol for all streams is required */
1111
        if (i > 0) {
1112
            if (reply->transports[0].lower_transport != rt->lower_transport ||
1113
                reply->transports[0].transport != rt->transport) {
1114
                err = AVERROR_INVALIDDATA;
1115
                goto fail;
1116
            }
1117
        } else {
1118
            rt->lower_transport = reply->transports[0].lower_transport;
1119
            rt->transport = reply->transports[0].transport;
1120
        }
1121

    
1122
        /* close RTP connection if not choosen */
1123
        if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1124
            (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1125
            url_close(rtsp_st->rtp_handle);
1126
            rtsp_st->rtp_handle = NULL;
1127
        }
1128

    
1129
        switch(reply->transports[0].lower_transport) {
1130
        case RTSP_LOWER_TRANSPORT_TCP:
1131
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1132
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1133
            break;
1134

    
1135
        case RTSP_LOWER_TRANSPORT_UDP: {
1136
            char url[1024];
1137

    
1138
            /* XXX: also use address if specified */
1139
            ff_url_join(url, sizeof(url), "rtp", NULL, host,
1140
                        reply->transports[0].server_port_min, NULL);
1141
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1142
                rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1143
                err = AVERROR_INVALIDDATA;
1144
                goto fail;
1145
            }
1146
            /* Try to initialize the connection state in a
1147
             * potential NAT router by sending dummy packets.
1148
             * RTP/RTCP dummy packets are used for RDT, too.
1149
             */
1150
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1151
                rtp_send_punch_packets(rtsp_st->rtp_handle);
1152
            break;
1153
        }
1154
        case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1155
            char url[1024];
1156
            struct in_addr in;
1157
            int port, ttl;
1158

    
1159
            if (reply->transports[0].destination) {
1160
                in.s_addr = htonl(reply->transports[0].destination);
1161
                port      = reply->transports[0].port_min;
1162
                ttl       = reply->transports[0].ttl;
1163
            } else {
1164
                in        = rtsp_st->sdp_ip;
1165
                port      = rtsp_st->sdp_port;
1166
                ttl       = rtsp_st->sdp_ttl;
1167
            }
1168
            ff_url_join(url, sizeof(url), "rtp", NULL, inet_ntoa(in),
1169
                        port, "?ttl=%d", ttl);
1170
            if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1171
                err = AVERROR_INVALIDDATA;
1172
                goto fail;
1173
            }
1174
            break;
1175
        }
1176
        }
1177

    
1178
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1179
            goto fail;
1180
    }
1181

    
1182
    if (reply->timeout > 0)
1183
        rt->timeout = reply->timeout;
1184

    
1185
    if (rt->server_type == RTSP_SERVER_REAL)
1186
        rt->need_subscription = 1;
1187

    
1188
    return 0;
1189

    
1190
fail:
1191
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1192
        if (rt->rtsp_streams[i]->rtp_handle) {
1193
            url_close(rt->rtsp_streams[i]->rtp_handle);
1194
            rt->rtsp_streams[i]->rtp_handle = NULL;
1195
        }
1196
    }
1197
    return err;
1198
}
1199

    
1200
static int rtsp_read_play(AVFormatContext *s)
1201
{
1202
    RTSPState *rt = s->priv_data;
1203
    RTSPMessageHeader reply1, *reply = &reply1;
1204
    int i;
1205
    char cmd[1024];
1206

    
1207
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1208

    
1209
    if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1210
        if (rt->state == RTSP_STATE_PAUSED) {
1211
            cmd[0] = 0;
1212
        } else {
1213
            snprintf(cmd, sizeof(cmd),
1214
                     "Range: npt=%0.3f-\r\n",
1215
                     (double)rt->seek_timestamp / AV_TIME_BASE);
1216
        }
1217
        ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
1218
        if (reply->status_code != RTSP_STATUS_OK) {
1219
            return -1;
1220
        }
1221
        if (reply->range_start != AV_NOPTS_VALUE &&
1222
            rt->transport == RTSP_TRANSPORT_RTP) {
1223
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1224
                RTSPStream *rtsp_st = rt->rtsp_streams[i];
1225
                RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1226
                AVStream *st = NULL;
1227
                if (!rtpctx)
1228
                    continue;
1229
                if (rtsp_st->stream_index >= 0)
1230
                    st = s->streams[rtsp_st->stream_index];
1231
                rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
1232
                rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
1233
                if (st)
1234
                    rtpctx->range_start_offset = av_rescale_q(reply->range_start,
1235
                                                              AV_TIME_BASE_Q,
1236
                                                              st->time_base);
1237
            }
1238
        }
1239
    }
1240
    rt->state = RTSP_STATE_STREAMING;
1241
    return 0;
1242
}
1243

    
1244
static int rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
1245
{
1246
    RTSPState *rt = s->priv_data;
1247
    char cmd[1024];
1248
    unsigned char *content = NULL;
1249
    int ret;
1250

    
1251
    /* describe the stream */
1252
    snprintf(cmd, sizeof(cmd),
1253
             "Accept: application/sdp\r\n");
1254
    if (rt->server_type == RTSP_SERVER_REAL) {
1255
        /**
1256
         * The Require: attribute is needed for proper streaming from
1257
         * Realmedia servers.
1258
         */
1259
        av_strlcat(cmd,
1260
                   "Require: com.real.retain-entity-for-setup\r\n",
1261
                   sizeof(cmd));
1262
    }
1263
    ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
1264
    if (!content)
1265
        return AVERROR_INVALIDDATA;
1266
    if (reply->status_code != RTSP_STATUS_OK) {
1267
        av_freep(&content);
1268
        return AVERROR_INVALIDDATA;
1269
    }
1270

    
1271
    /* now we got the SDP description, we parse it */
1272
    ret = sdp_parse(s, (const char *)content);
1273
    av_freep(&content);
1274
    if (ret < 0)
1275
        return AVERROR_INVALIDDATA;
1276

    
1277
    return 0;
1278
}
1279

    
1280
static int rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
1281
{
1282
    RTSPState *rt = s->priv_data;
1283
    RTSPMessageHeader reply1, *reply = &reply1;
1284
    int i;
1285
    char *sdp;
1286
    AVFormatContext sdp_ctx, *ctx_array[1];
1287

    
1288
    rt->start_time = av_gettime();
1289

    
1290
    /* Announce the stream */
1291
    sdp = av_mallocz(8192);
1292
    if (sdp == NULL)
1293
        return AVERROR(ENOMEM);
1294
    /* We create the SDP based on the RTSP AVFormatContext where we
1295
     * aren't allowed to change the filename field. (We create the SDP
1296
     * based on the RTSP context since the contexts for the RTP streams
1297
     * don't exist yet.) In order to specify a custom URL with the actual
1298
     * peer IP instead of the originally specified hostname, we create
1299
     * a temporary copy of the AVFormatContext, where the custom URL is set.
1300
     *
1301
     * FIXME: Create the SDP without copying the AVFormatContext.
1302
     * This either requires setting up the RTP stream AVFormatContexts
1303
     * already here (complicating things immensely) or getting a more
1304
     * flexible SDP creation interface.
1305
     */
1306
    sdp_ctx = *s;
1307
    ff_url_join(sdp_ctx.filename, sizeof(sdp_ctx.filename),
1308
                "rtsp", NULL, addr, -1, NULL);
1309
    ctx_array[0] = &sdp_ctx;
1310
    if (avf_sdp_create(ctx_array, 1, sdp, 8192)) {
1311
        av_free(sdp);
1312
        return AVERROR_INVALIDDATA;
1313
    }
1314
    av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
1315
    ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri,
1316
                                  "Content-Type: application/sdp\r\n",
1317
                                  reply, NULL, sdp, strlen(sdp));
1318
    av_free(sdp);
1319
    if (reply->status_code != RTSP_STATUS_OK)
1320
        return AVERROR_INVALIDDATA;
1321

    
1322
    /* Set up the RTSPStreams for each AVStream */
1323
    for (i = 0; i < s->nb_streams; i++) {
1324
        RTSPStream *rtsp_st;
1325
        AVStream *st = s->streams[i];
1326

    
1327
        rtsp_st = av_mallocz(sizeof(RTSPStream));
1328
        if (!rtsp_st)
1329
            return AVERROR(ENOMEM);
1330
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
1331

    
1332
        st->priv_data = rtsp_st;
1333
        rtsp_st->stream_index = i;
1334

    
1335
        av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
1336
        /* Note, this must match the relative uri set in the sdp content */
1337
        av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
1338
                    "/streamid=%d", i);
1339
    }
1340

    
1341
    return 0;
1342
}
1343

    
1344
void ff_rtsp_close_connections(AVFormatContext *s)
1345
{
1346
    RTSPState *rt = s->priv_data;
1347
    if (rt->rtsp_hd_out != rt->rtsp_hd) url_close(rt->rtsp_hd_out);
1348
    url_close(rt->rtsp_hd);
1349
    rt->rtsp_hd = rt->rtsp_hd_out = NULL;
1350
}
1351

    
1352
int ff_rtsp_connect(AVFormatContext *s)
1353
{
1354
    RTSPState *rt = s->priv_data;
1355
    char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1356
    char *option_list, *option, *filename;
1357
    int port, err, tcp_fd;
1358
    RTSPMessageHeader reply1 = {}, *reply = &reply1;
1359
    int lower_transport_mask = 0;
1360
    char real_challenge[64];
1361
    struct sockaddr_storage peer;
1362
    socklen_t peer_len = sizeof(peer);
1363

    
1364
    if (!ff_network_init())
1365
        return AVERROR(EIO);
1366
redirect:
1367
    rt->control_transport = RTSP_MODE_PLAIN;
1368
    /* extract hostname and port */
1369
    av_url_split(NULL, 0, auth, sizeof(auth),
1370
                 host, sizeof(host), &port, path, sizeof(path), s->filename);
1371
    if (*auth) {
1372
        av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1373
    }
1374
    if (port < 0)
1375
        port = RTSP_DEFAULT_PORT;
1376

    
1377
    /* search for options */
1378
    option_list = strrchr(path, '?');
1379
    if (option_list) {
1380
        /* Strip out the RTSP specific options, write out the rest of
1381
         * the options back into the same string. */
1382
        filename = option_list;
1383
        while (option_list) {
1384
            /* move the option pointer */
1385
            option = ++option_list;
1386
            option_list = strchr(option_list, '&');
1387
            if (option_list)
1388
                *option_list = 0;
1389

    
1390
            /* handle the options */
1391
            if (!strcmp(option, "udp")) {
1392
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP);
1393
            } else if (!strcmp(option, "multicast")) {
1394
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1395
            } else if (!strcmp(option, "tcp")) {
1396
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1397
            } else if(!strcmp(option, "http")) {
1398
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1399
                rt->control_transport = RTSP_MODE_TUNNEL;
1400
            } else {
1401
                /* Write options back into the buffer, using memmove instead
1402
                 * of strcpy since the strings may overlap. */
1403
                int len = strlen(option);
1404
                memmove(++filename, option, len);
1405
                filename += len;
1406
                if (option_list) *filename = '&';
1407
            }
1408
        }
1409
        *filename = 0;
1410
    }
1411

    
1412
    if (!lower_transport_mask)
1413
        lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1414

    
1415
    if (s->oformat) {
1416
        /* Only UDP or TCP - UDP multicast isn't supported. */
1417
        lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1418
                                (1 << RTSP_LOWER_TRANSPORT_TCP);
1419
        if (!lower_transport_mask || rt->control_transport == RTSP_MODE_TUNNEL) {
1420
            av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1421
                                    "only UDP and TCP are supported for output.\n");
1422
            err = AVERROR(EINVAL);
1423
            goto fail;
1424
        }
1425
    }
1426

    
1427
    /* Construct the URI used in request; this is similar to s->filename,
1428
     * but with authentication credentials removed and RTSP specific options
1429
     * stripped out. */
1430
    ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1431
                host, port, "%s", path);
1432

    
1433
    if (rt->control_transport == RTSP_MODE_TUNNEL) {
1434
        /* set up initial handshake for tunneling */
1435
        char httpname[1024];
1436
        char sessioncookie[17];
1437
        char headers[1024];
1438

    
1439
        ff_url_join(httpname, sizeof(httpname), "http", auth, host, port, "%s", path);
1440
        snprintf(sessioncookie, sizeof(sessioncookie), "%08x%08x",
1441
                 av_get_random_seed(), av_get_random_seed());
1442

    
1443
        /* GET requests */
1444
        if (url_alloc(&rt->rtsp_hd, httpname, URL_RDONLY) < 0) {
1445
            err = AVERROR(EIO);
1446
            goto fail;
1447
        }
1448

    
1449
        /* generate GET headers */
1450
        snprintf(headers, sizeof(headers),
1451
                 "x-sessioncookie: %s\r\n"
1452
                 "Accept: application/x-rtsp-tunnelled\r\n"
1453
                 "Pragma: no-cache\r\n"
1454
                 "Cache-Control: no-cache\r\n",
1455
                 sessioncookie);
1456
        ff_http_set_headers(rt->rtsp_hd, headers);
1457

    
1458
        /* complete the connection */
1459
        if (url_connect(rt->rtsp_hd)) {
1460
            err = AVERROR(EIO);
1461
            goto fail;
1462
        }
1463

    
1464
        /* POST requests */
1465
        if (url_alloc(&rt->rtsp_hd_out, httpname, URL_WRONLY) < 0 ) {
1466
            err = AVERROR(EIO);
1467
            goto fail;
1468
        }
1469

    
1470
        /* generate POST headers */
1471
        snprintf(headers, sizeof(headers),
1472
                 "x-sessioncookie: %s\r\n"
1473
                 "Content-Type: application/x-rtsp-tunnelled\r\n"
1474
                 "Pragma: no-cache\r\n"
1475
                 "Cache-Control: no-cache\r\n"
1476
                 "Content-Length: 32767\r\n"
1477
                 "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
1478
                 sessioncookie);
1479
        ff_http_set_headers(rt->rtsp_hd_out, headers);
1480
        ff_http_set_chunked_transfer_encoding(rt->rtsp_hd_out, 0);
1481

    
1482
        /* Initialize the authentication state for the POST session. The HTTP
1483
         * protocol implementation doesn't properly handle multi-pass
1484
         * authentication for POST requests, since it would require one of
1485
         * the following:
1486
         * - implementing Expect: 100-continue, which many HTTP servers
1487
         *   don't support anyway, even less the RTSP servers that do HTTP
1488
         *   tunneling
1489
         * - sending the whole POST data until getting a 401 reply specifying
1490
         *   what authentication method to use, then resending all that data
1491
         * - waiting for potential 401 replies directly after sending the
1492
         *   POST header (waiting for some unspecified time)
1493
         * Therefore, we copy the full auth state, which works for both basic
1494
         * and digest. (For digest, we would have to synchronize the nonce
1495
         * count variable between the two sessions, if we'd do more requests
1496
         * with the original session, though.)
1497
         */
1498
        ff_http_init_auth_state(rt->rtsp_hd_out, rt->rtsp_hd);
1499

    
1500
        /* complete the connection */
1501
        if (url_connect(rt->rtsp_hd_out)) {
1502
            err = AVERROR(EIO);
1503
            goto fail;
1504
        }
1505
    } else {
1506
        /* open the tcp connection */
1507
        ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
1508
        if (url_open(&rt->rtsp_hd, tcpname, URL_RDWR) < 0) {
1509
            err = AVERROR(EIO);
1510
            goto fail;
1511
        }
1512
        rt->rtsp_hd_out = rt->rtsp_hd;
1513
    }
1514
    rt->seq = 0;
1515

    
1516
    tcp_fd = url_get_file_handle(rt->rtsp_hd);
1517
    if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1518
        getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1519
                    NULL, 0, NI_NUMERICHOST);
1520
    }
1521

    
1522
    /* request options supported by the server; this also detects server
1523
     * type */
1524
    for (rt->server_type = RTSP_SERVER_RTP;;) {
1525
        cmd[0] = 0;
1526
        if (rt->server_type == RTSP_SERVER_REAL)
1527
            av_strlcat(cmd,
1528
                       /**
1529
                        * The following entries are required for proper
1530
                        * streaming from a Realmedia server. They are
1531
                        * interdependent in some way although we currently
1532
                        * don't quite understand how. Values were copied
1533
                        * from mplayer SVN r23589.
1534
                        * @param CompanyID is a 16-byte ID in base64
1535
                        * @param ClientChallenge is a 16-byte ID in hex
1536
                        */
1537
                       "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1538
                       "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1539
                       "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1540
                       "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1541
                       sizeof(cmd));
1542
        ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1543
        if (reply->status_code != RTSP_STATUS_OK) {
1544
            err = AVERROR_INVALIDDATA;
1545
            goto fail;
1546
        }
1547

    
1548
        /* detect server type if not standard-compliant RTP */
1549
        if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1550
            rt->server_type = RTSP_SERVER_REAL;
1551
            continue;
1552
        } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1553
            rt->server_type = RTSP_SERVER_WMS;
1554
        } else if (rt->server_type == RTSP_SERVER_REAL)
1555
            strcpy(real_challenge, reply->real_challenge);
1556
        break;
1557
    }
1558

    
1559
    if (s->iformat)
1560
        err = rtsp_setup_input_streams(s, reply);
1561
    else
1562
        err = rtsp_setup_output_streams(s, host);
1563
    if (err)
1564
        goto fail;
1565

    
1566
    do {
1567
        int lower_transport = ff_log2_tab[lower_transport_mask &
1568
                                  ~(lower_transport_mask - 1)];
1569

    
1570
        err = make_setup_request(s, host, port, lower_transport,
1571
                                 rt->server_type == RTSP_SERVER_REAL ?
1572
                                     real_challenge : NULL);
1573
        if (err < 0)
1574
            goto fail;
1575
        lower_transport_mask &= ~(1 << lower_transport);
1576
        if (lower_transport_mask == 0 && err == 1) {
1577
            err = FF_NETERROR(EPROTONOSUPPORT);
1578
            goto fail;
1579
        }
1580
    } while (err);
1581

    
1582
    rt->state = RTSP_STATE_IDLE;
1583
    rt->seek_timestamp = 0; /* default is to start stream at position zero */
1584
    return 0;
1585
 fail:
1586
    ff_rtsp_close_streams(s);
1587
    ff_rtsp_close_connections(s);
1588
    if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1589
        av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1590
        av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1591
               reply->status_code,
1592
               s->filename);
1593
        goto redirect;
1594
    }
1595
    ff_network_close();
1596
    return err;
1597
}
1598
#endif
1599

    
1600
#if CONFIG_RTSP_DEMUXER
1601
static int rtsp_read_header(AVFormatContext *s,
1602
                            AVFormatParameters *ap)
1603
{
1604
    int ret;
1605

    
1606
    ret = ff_rtsp_connect(s);
1607
    if (ret)
1608
        return ret;
1609

    
1610
    if (ap->initial_pause) {
1611
         /* do not start immediately */
1612
    } else {
1613
         if (rtsp_read_play(s) < 0) {
1614
            ff_rtsp_close_streams(s);
1615
            ff_rtsp_close_connections(s);
1616
            return AVERROR_INVALIDDATA;
1617
        }
1618
    }
1619

    
1620
    return 0;
1621
}
1622

    
1623
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1624
                           uint8_t *buf, int buf_size)
1625
{
1626
    RTSPState *rt = s->priv_data;
1627
    RTSPStream *rtsp_st;
1628
    fd_set rfds;
1629
    int fd, fd_max, n, i, ret, tcp_fd, timeout_cnt = 0;
1630
    struct timeval tv;
1631

    
1632
    for (;;) {
1633
        if (url_interrupt_cb())
1634
            return AVERROR(EINTR);
1635
        FD_ZERO(&rfds);
1636
        if (rt->rtsp_hd) {
1637
            tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1638
            FD_SET(tcp_fd, &rfds);
1639
        } else {
1640
            fd_max = 0;
1641
            tcp_fd = -1;
1642
        }
1643
        for (i = 0; i < rt->nb_rtsp_streams; i++) {
1644
            rtsp_st = rt->rtsp_streams[i];
1645
            if (rtsp_st->rtp_handle) {
1646
                /* currently, we cannot probe RTCP handle because of
1647
                 * blocking restrictions */
1648
                fd = url_get_file_handle(rtsp_st->rtp_handle);
1649
                if (fd > fd_max)
1650
                    fd_max = fd;
1651
                FD_SET(fd, &rfds);
1652
            }
1653
        }
1654
        tv.tv_sec = 0;
1655
        tv.tv_usec = SELECT_TIMEOUT_MS * 1000;
1656
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1657
        if (n > 0) {
1658
            timeout_cnt = 0;
1659
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1660
                rtsp_st = rt->rtsp_streams[i];
1661
                if (rtsp_st->rtp_handle) {
1662
                    fd = url_get_file_handle(rtsp_st->rtp_handle);
1663
                    if (FD_ISSET(fd, &rfds)) {
1664
                        ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1665
                        if (ret > 0) {
1666
                            *prtsp_st = rtsp_st;
1667
                            return ret;
1668
                        }
1669
                    }
1670
                }
1671
            }
1672
#if CONFIG_RTSP_DEMUXER
1673
            if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1674
                RTSPMessageHeader reply;
1675

    
1676
                ret = ff_rtsp_read_reply(s, &reply, NULL, 0);
1677
                if (ret < 0)
1678
                    return ret;
1679
                /* XXX: parse message */
1680
                if (rt->state != RTSP_STATE_STREAMING)
1681
                    return 0;
1682
            }
1683
#endif
1684
        } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1685
            return FF_NETERROR(ETIMEDOUT);
1686
        } else if (n < 0 && errno != EINTR)
1687
            return AVERROR(errno);
1688
    }
1689
}
1690

    
1691
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1692
                           uint8_t *buf, int buf_size)
1693
{
1694
    RTSPState *rt = s->priv_data;
1695
    int id, len, i, ret;
1696
    RTSPStream *rtsp_st;
1697

    
1698
#ifdef DEBUG_RTP_TCP
1699
    dprintf(s, "tcp_read_packet:\n");
1700
#endif
1701
redo:
1702
    for (;;) {
1703
        RTSPMessageHeader reply;
1704

    
1705
        ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
1706
        if (ret == -1)
1707
            return -1;
1708
        if (ret == 1) /* received '$' */
1709
            break;
1710
        /* XXX: parse message */
1711
        if (rt->state != RTSP_STATE_STREAMING)
1712
            return 0;
1713
    }
1714
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
1715
    if (ret != 3)
1716
        return -1;
1717
    id  = buf[0];
1718
    len = AV_RB16(buf + 1);
1719
#ifdef DEBUG_RTP_TCP
1720
    dprintf(s, "id=%d len=%d\n", id, len);
1721
#endif
1722
    if (len > buf_size || len < 12)
1723
        goto redo;
1724
    /* get the data */
1725
    ret = url_read_complete(rt->rtsp_hd, buf, len);
1726
    if (ret != len)
1727
        return -1;
1728
    if (rt->transport == RTSP_TRANSPORT_RDT &&
1729
        ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1730
        return -1;
1731

    
1732
    /* find the matching stream */
1733
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1734
        rtsp_st = rt->rtsp_streams[i];
1735
        if (id >= rtsp_st->interleaved_min &&
1736
            id <= rtsp_st->interleaved_max)
1737
            goto found;
1738
    }
1739
    goto redo;
1740
found:
1741
    *prtsp_st = rtsp_st;
1742
    return len;
1743
}
1744

    
1745
static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1746
{
1747
    RTSPState *rt = s->priv_data;
1748
    int ret, len;
1749
    uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1750
    RTSPStream *rtsp_st;
1751

    
1752
    /* get next frames from the same RTP packet */
1753
    if (rt->cur_transport_priv) {
1754
        if (rt->transport == RTSP_TRANSPORT_RDT) {
1755
            ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1756
        } else
1757
            ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1758
        if (ret == 0) {
1759
            rt->cur_transport_priv = NULL;
1760
            return 0;
1761
        } else if (ret == 1) {
1762
            return 0;
1763
        } else
1764
            rt->cur_transport_priv = NULL;
1765
    }
1766

    
1767
    /* read next RTP packet */
1768
 redo:
1769
    switch(rt->lower_transport) {
1770
    default:
1771
#if CONFIG_RTSP_DEMUXER
1772
    case RTSP_LOWER_TRANSPORT_TCP:
1773
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1774
        break;
1775
#endif
1776
    case RTSP_LOWER_TRANSPORT_UDP:
1777
    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1778
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1779
        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1780
            rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1781
        break;
1782
    }
1783
    if (len < 0)
1784
        return len;
1785
    if (len == 0)
1786
        return AVERROR_EOF;
1787
    if (rt->transport == RTSP_TRANSPORT_RDT) {
1788
        ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1789
    } else {
1790
        ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1791
        if (ret < 0) {
1792
            /* Either bad packet, or a RTCP packet. Check if the
1793
             * first_rtcp_ntp_time field was initialized. */
1794
            RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1795
            if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
1796
                /* first_rtcp_ntp_time has been initialized for this stream,
1797
                 * copy the same value to all other uninitialized streams,
1798
                 * in order to map their timestamp origin to the same ntp time
1799
                 * as this one. */
1800
                int i;
1801
                for (i = 0; i < rt->nb_rtsp_streams; i++) {
1802
                    RTPDemuxContext *rtpctx2 = rtsp_st->transport_priv;
1803
                    if (rtpctx2 &&
1804
                        rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE)
1805
                        rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
1806
                }
1807
            }
1808
        }
1809
    }
1810
    if (ret < 0)
1811
        goto redo;
1812
    if (ret == 1)
1813
        /* more packets may follow, so we save the RTP context */
1814
        rt->cur_transport_priv = rtsp_st->transport_priv;
1815

    
1816
    return ret;
1817
}
1818

    
1819
static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1820
{
1821
    RTSPState *rt = s->priv_data;
1822
    int ret;
1823
    RTSPMessageHeader reply1, *reply = &reply1;
1824
    char cmd[1024];
1825

    
1826
    if (rt->server_type == RTSP_SERVER_REAL) {
1827
        int i;
1828
        enum AVDiscard cache[MAX_STREAMS];
1829

    
1830
        for (i = 0; i < s->nb_streams; i++)
1831
            cache[i] = s->streams[i]->discard;
1832

    
1833
        if (!rt->need_subscription) {
1834
            if (memcmp (cache, rt->real_setup_cache,
1835
                        sizeof(enum AVDiscard) * s->nb_streams)) {
1836
                snprintf(cmd, sizeof(cmd),
1837
                         "Unsubscribe: %s\r\n",
1838
                         rt->last_subscription);
1839
                ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1840
                                 cmd, reply, NULL);
1841
                if (reply->status_code != RTSP_STATUS_OK)
1842
                    return AVERROR_INVALIDDATA;
1843
                rt->need_subscription = 1;
1844
            }
1845
        }
1846

    
1847
        if (rt->need_subscription) {
1848
            int r, rule_nr, first = 1;
1849

    
1850
            memcpy(rt->real_setup_cache, cache,
1851
                   sizeof(enum AVDiscard) * s->nb_streams);
1852
            rt->last_subscription[0] = 0;
1853

    
1854
            snprintf(cmd, sizeof(cmd),
1855
                     "Subscribe: ");
1856
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1857
                rule_nr = 0;
1858
                for (r = 0; r < s->nb_streams; r++) {
1859
                    if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1860
                        if (s->streams[r]->discard != AVDISCARD_ALL) {
1861
                            if (!first)
1862
                                av_strlcat(rt->last_subscription, ",",
1863
                                           sizeof(rt->last_subscription));
1864
                            ff_rdt_subscribe_rule(
1865
                                rt->last_subscription,
1866
                                sizeof(rt->last_subscription), i, rule_nr);
1867
                            first = 0;
1868
                        }
1869
                        rule_nr++;
1870
                    }
1871
                }
1872
            }
1873
            av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1874
            ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1875
                             cmd, reply, NULL);
1876
            if (reply->status_code != RTSP_STATUS_OK)
1877
                return AVERROR_INVALIDDATA;
1878
            rt->need_subscription = 0;
1879

    
1880
            if (rt->state == RTSP_STATE_STREAMING)
1881
                rtsp_read_play (s);
1882
        }
1883
    }
1884

    
1885
    ret = rtsp_fetch_packet(s, pkt);
1886
    if (ret < 0)
1887
        return ret;
1888

    
1889
    /* send dummy request to keep TCP connection alive */
1890
    if ((rt->server_type == RTSP_SERVER_WMS ||
1891
         rt->server_type == RTSP_SERVER_REAL) &&
1892
        (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1893
        if (rt->server_type == RTSP_SERVER_WMS) {
1894
            ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
1895
        } else {
1896
            ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
1897
        }
1898
    }
1899

    
1900
    return 0;
1901
}
1902

    
1903
/* pause the stream */
1904
static int rtsp_read_pause(AVFormatContext *s)
1905
{
1906
    RTSPState *rt = s->priv_data;
1907
    RTSPMessageHeader reply1, *reply = &reply1;
1908

    
1909
    if (rt->state != RTSP_STATE_STREAMING)
1910
        return 0;
1911
    else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1912
        ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
1913
        if (reply->status_code != RTSP_STATUS_OK) {
1914
            return -1;
1915
        }
1916
    }
1917
    rt->state = RTSP_STATE_PAUSED;
1918
    return 0;
1919
}
1920

    
1921
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1922
                          int64_t timestamp, int flags)
1923
{
1924
    RTSPState *rt = s->priv_data;
1925

    
1926
    rt->seek_timestamp = av_rescale_q(timestamp,
1927
                                      s->streams[stream_index]->time_base,
1928
                                      AV_TIME_BASE_Q);
1929
    switch(rt->state) {
1930
    default:
1931
    case RTSP_STATE_IDLE:
1932
        break;
1933
    case RTSP_STATE_STREAMING:
1934
        if (rtsp_read_pause(s) != 0)
1935
            return -1;
1936
        rt->state = RTSP_STATE_SEEKING;
1937
        if (rtsp_read_play(s) != 0)
1938
            return -1;
1939
        break;
1940
    case RTSP_STATE_PAUSED:
1941
        rt->state = RTSP_STATE_IDLE;
1942
        break;
1943
    }
1944
    return 0;
1945
}
1946

    
1947
static int rtsp_read_close(AVFormatContext *s)
1948
{
1949
    RTSPState *rt = s->priv_data;
1950

    
1951
#if 0
1952
    /* NOTE: it is valid to flush the buffer here */
1953
    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1954
        url_fclose(&rt->rtsp_gb);
1955
    }
1956
#endif
1957
    ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
1958

    
1959
    ff_rtsp_close_streams(s);
1960
    ff_rtsp_close_connections(s);
1961
    ff_network_close();
1962
    return 0;
1963
}
1964

    
1965
AVInputFormat rtsp_demuxer = {
1966
    "rtsp",
1967
    NULL_IF_CONFIG_SMALL("RTSP input format"),
1968
    sizeof(RTSPState),
1969
    rtsp_probe,
1970
    rtsp_read_header,
1971
    rtsp_read_packet,
1972
    rtsp_read_close,
1973
    rtsp_read_seek,
1974
    .flags = AVFMT_NOFILE,
1975
    .read_play = rtsp_read_play,
1976
    .read_pause = rtsp_read_pause,
1977
};
1978
#endif
1979

    
1980
static int sdp_probe(AVProbeData *p1)
1981
{
1982
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1983

    
1984
    /* we look for a line beginning "c=IN IP4" */
1985
    while (p < p_end && *p != '\0') {
1986
        if (p + sizeof("c=IN IP4") - 1 < p_end &&
1987
            av_strstart(p, "c=IN IP4", NULL))
1988
            return AVPROBE_SCORE_MAX / 2;
1989

    
1990
        while (p < p_end - 1 && *p != '\n') p++;
1991
        if (++p >= p_end)
1992
            break;
1993
        if (*p == '\r')
1994
            p++;
1995
    }
1996
    return 0;
1997
}
1998

    
1999
#define SDP_MAX_SIZE 8192
2000

    
2001
static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
2002
{
2003
    RTSPState *rt = s->priv_data;
2004
    RTSPStream *rtsp_st;
2005
    int size, i, err;
2006
    char *content;
2007
    char url[1024];
2008

    
2009
    if (!ff_network_init())
2010
        return AVERROR(EIO);
2011

    
2012
    /* read the whole sdp file */
2013
    /* XXX: better loading */
2014
    content = av_malloc(SDP_MAX_SIZE);
2015
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
2016
    if (size <= 0) {
2017
        av_free(content);
2018
        return AVERROR_INVALIDDATA;
2019
    }
2020
    content[size] ='\0';
2021

    
2022
    sdp_parse(s, content);
2023
    av_free(content);
2024

    
2025
    /* open each RTP stream */
2026
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
2027
        rtsp_st = rt->rtsp_streams[i];
2028

    
2029
        ff_url_join(url, sizeof(url), "rtp", NULL,
2030
                    inet_ntoa(rtsp_st->sdp_ip), rtsp_st->sdp_port,
2031
                    "?localport=%d&ttl=%d", rtsp_st->sdp_port,
2032
                    rtsp_st->sdp_ttl);
2033
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
2034
            err = AVERROR_INVALIDDATA;
2035
            goto fail;
2036
        }
2037
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
2038
            goto fail;
2039
    }
2040
    return 0;
2041
fail:
2042
    ff_rtsp_close_streams(s);
2043
    ff_network_close();
2044
    return err;
2045
}
2046

    
2047
static int sdp_read_close(AVFormatContext *s)
2048
{
2049
    ff_rtsp_close_streams(s);
2050
    ff_network_close();
2051
    return 0;
2052
}
2053

    
2054
AVInputFormat sdp_demuxer = {
2055
    "sdp",
2056
    NULL_IF_CONFIG_SMALL("SDP"),
2057
    sizeof(RTSPState),
2058
    sdp_probe,
2059
    sdp_read_header,
2060
    rtsp_fetch_packet,
2061
    sdp_read_close,
2062
};