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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
 *
17
 * 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
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
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>
29
#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"
36
#include "http.h"
37
#include "rtsp.h"
38

    
39
#include "rtpdec.h"
40
#include "rdt.h"
41
#include "rtpdec_formats.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
#define SDP_MAX_SIZE 16384
56

    
57
static void get_word_until_chars(char *buf, int buf_size,
58
                                 const char *sep, const char **pp)
59
{
60
    const char *p;
61
    char *q;
62

    
63
    p = *pp;
64
    p += strspn(p, SPACE_CHARS);
65
    q = buf;
66
    while (!strchr(sep, *p) && *p != '\0') {
67
        if ((q - buf) < buf_size - 1)
68
            *q++ = *p;
69
        p++;
70
    }
71
    if (buf_size > 0)
72
        *q = '\0';
73
    *pp = p;
74
}
75

    
76
static void get_word_sep(char *buf, int buf_size, const char *sep,
77
                         const char **pp)
78
{
79
    if (**pp == '/') (*pp)++;
80
    get_word_until_chars(buf, buf_size, sep, pp);
81
}
82

    
83
static void get_word(char *buf, int buf_size, const char **pp)
84
{
85
    get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
86
}
87

    
88
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
89
static int sdp_parse_rtpmap(AVFormatContext *s,
90
                            AVCodecContext *codec, RTSPStream *rtsp_st,
91
                            int payload_type, const char *p)
92
{
93
    char buf[256];
94
    int i;
95
    AVCodec *c;
96
    const char *c_name;
97

    
98
    /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
99
     * see if we can handle this kind of payload.
100
     * The space should normally not be there but some Real streams or
101
     * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
102
     * have a trailing space. */
103
    get_word_sep(buf, sizeof(buf), "/ ", &p);
104
    if (payload_type >= RTP_PT_PRIVATE) {
105
        RTPDynamicProtocolHandler *handler;
106
        for (handler = RTPFirstDynamicPayloadHandler;
107
             handler; handler = handler->next) {
108
            if (!strcasecmp(buf, handler->enc_name) &&
109
                codec->codec_type == handler->codec_type) {
110
                codec->codec_id          = handler->codec_id;
111
                rtsp_st->dynamic_handler = handler;
112
                if (handler->open)
113
                    rtsp_st->dynamic_protocol_context = handler->open();
114
                break;
115
            }
116
        }
117
    } else {
118
        /* We are in a standard case
119
         * (from http://www.iana.org/assignments/rtp-parameters). */
120
        /* search into AVRtpPayloadTypes[] */
121
        codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
122
    }
123

    
124
    c = avcodec_find_decoder(codec->codec_id);
125
    if (c && c->name)
126
        c_name = c->name;
127
    else
128
        c_name = "(null)";
129

    
130
    get_word_sep(buf, sizeof(buf), "/", &p);
131
    i = atoi(buf);
132
    switch (codec->codec_type) {
133
    case AVMEDIA_TYPE_AUDIO:
134
        av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
135
        codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
136
        codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
137
        if (i > 0) {
138
            codec->sample_rate = i;
139
            get_word_sep(buf, sizeof(buf), "/", &p);
140
            i = atoi(buf);
141
            if (i > 0)
142
                codec->channels = i;
143
            // TODO: there is a bug here; if it is a mono stream, and
144
            // less than 22000Hz, faad upconverts to stereo and twice
145
            // the frequency.  No problem, but the sample rate is being
146
            // set here by the sdp line. Patch on its way. (rdm)
147
        }
148
        av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
149
               codec->sample_rate);
150
        av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
151
               codec->channels);
152
        break;
153
    case AVMEDIA_TYPE_VIDEO:
154
        av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
155
        break;
156
    default:
157
        break;
158
    }
159
    return 0;
160
}
161

    
162
/* parse the attribute line from the fmtp a line of an sdp response. This
163
 * is broken out as a function because it is used in rtp_h264.c, which is
164
 * forthcoming. */
165
int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
166
                                char *value, int value_size)
167
{
168
    *p += strspn(*p, SPACE_CHARS);
169
    if (**p) {
170
        get_word_sep(attr, attr_size, "=", p);
171
        if (**p == '=')
172
            (*p)++;
173
        get_word_sep(value, value_size, ";", p);
174
        if (**p == ';')
175
            (*p)++;
176
        return 1;
177
    }
178
    return 0;
179
}
180

    
181
/** Parse a string p in the form of Range:npt=xx-xx, and determine the start
182
 *  and end time.
183
 *  Used for seeking in the rtp stream.
184
 */
185
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
186
{
187
    char buf[256];
188

    
189
    p += strspn(p, SPACE_CHARS);
190
    if (!av_stristart(p, "npt=", &p))
191
        return;
192

    
193
    *start = AV_NOPTS_VALUE;
194
    *end = AV_NOPTS_VALUE;
195

    
196
    get_word_sep(buf, sizeof(buf), "-", &p);
197
    *start = parse_date(buf, 1);
198
    if (*p == '-') {
199
        p++;
200
        get_word_sep(buf, sizeof(buf), "-", &p);
201
        *end = parse_date(buf, 1);
202
    }
203
//    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
204
//    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
205
}
206

    
207
typedef struct SDPParseState {
208
    /* SDP only */
209
    struct in_addr default_ip;
210
    int            default_ttl;
211
    int            skip_media;  ///< set if an unknown m= line occurs
212
} SDPParseState;
213

    
214
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
215
                           int letter, const char *buf)
216
{
217
    RTSPState *rt = s->priv_data;
218
    char buf1[64], st_type[64];
219
    const char *p;
220
    enum AVMediaType codec_type;
221
    int payload_type, i;
222
    AVStream *st;
223
    RTSPStream *rtsp_st;
224
    struct in_addr sdp_ip;
225
    int ttl;
226

    
227
    dprintf(s, "sdp: %c='%s'\n", letter, buf);
228

    
229
    p = buf;
230
    if (s1->skip_media && letter != 'm')
231
        return;
232
    switch (letter) {
233
    case 'c':
234
        get_word(buf1, sizeof(buf1), &p);
235
        if (strcmp(buf1, "IN") != 0)
236
            return;
237
        get_word(buf1, sizeof(buf1), &p);
238
        if (strcmp(buf1, "IP4") != 0)
239
            return;
240
        get_word_sep(buf1, sizeof(buf1), "/", &p);
241
        if (ff_inet_aton(buf1, &sdp_ip) == 0)
242
            return;
243
        ttl = 16;
244
        if (*p == '/') {
245
            p++;
246
            get_word_sep(buf1, sizeof(buf1), "/", &p);
247
            ttl = atoi(buf1);
248
        }
249
        if (s->nb_streams == 0) {
250
            s1->default_ip = sdp_ip;
251
            s1->default_ttl = ttl;
252
        } else {
253
            st = s->streams[s->nb_streams - 1];
254
            rtsp_st = st->priv_data;
255
            rtsp_st->sdp_ip = sdp_ip;
256
            rtsp_st->sdp_ttl = ttl;
257
        }
258
        break;
259
    case 's':
260
        av_metadata_set2(&s->metadata, "title", p, 0);
261
        break;
262
    case 'i':
263
        if (s->nb_streams == 0) {
264
            av_metadata_set2(&s->metadata, "comment", p, 0);
265
            break;
266
        }
267
        break;
268
    case 'm':
269
        /* new stream */
270
        s1->skip_media = 0;
271
        get_word(st_type, sizeof(st_type), &p);
272
        if (!strcmp(st_type, "audio")) {
273
            codec_type = AVMEDIA_TYPE_AUDIO;
274
        } else if (!strcmp(st_type, "video")) {
275
            codec_type = AVMEDIA_TYPE_VIDEO;
276
        } else if (!strcmp(st_type, "application")) {
277
            codec_type = AVMEDIA_TYPE_DATA;
278
        } else {
279
            s1->skip_media = 1;
280
            return;
281
        }
282
        rtsp_st = av_mallocz(sizeof(RTSPStream));
283
        if (!rtsp_st)
284
            return;
285
        rtsp_st->stream_index = -1;
286
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
287

    
288
        rtsp_st->sdp_ip = s1->default_ip;
289
        rtsp_st->sdp_ttl = s1->default_ttl;
290

    
291
        get_word(buf1, sizeof(buf1), &p); /* port */
292
        rtsp_st->sdp_port = atoi(buf1);
293

    
294
        get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
295

    
296
        /* XXX: handle list of formats */
297
        get_word(buf1, sizeof(buf1), &p); /* format list */
298
        rtsp_st->sdp_payload_type = atoi(buf1);
299

    
300
        if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
301
            /* no corresponding stream */
302
        } else {
303
            st = av_new_stream(s, 0);
304
            if (!st)
305
                return;
306
            st->priv_data = rtsp_st;
307
            rtsp_st->stream_index = st->index;
308
            st->codec->codec_type = codec_type;
309
            if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
310
                /* if standard payload type, we can find the codec right now */
311
                ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
312
            }
313
        }
314
        /* put a default control url */
315
        av_strlcpy(rtsp_st->control_url, rt->control_uri,
316
                   sizeof(rtsp_st->control_url));
317
        break;
318
    case 'a':
319
        if (av_strstart(p, "control:", &p)) {
320
            if (s->nb_streams == 0) {
321
                if (!strncmp(p, "rtsp://", 7))
322
                    av_strlcpy(rt->control_uri, p,
323
                               sizeof(rt->control_uri));
324
            } else {
325
            char proto[32];
326
            /* get the control url */
327
            st = s->streams[s->nb_streams - 1];
328
            rtsp_st = st->priv_data;
329

    
330
            /* XXX: may need to add full url resolution */
331
            av_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
332
                         NULL, NULL, 0, p);
333
            if (proto[0] == '\0') {
334
                /* relative control URL */
335
                if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
336
                av_strlcat(rtsp_st->control_url, "/",
337
                           sizeof(rtsp_st->control_url));
338
                av_strlcat(rtsp_st->control_url, p,
339
                           sizeof(rtsp_st->control_url));
340
            } else
341
                av_strlcpy(rtsp_st->control_url, p,
342
                           sizeof(rtsp_st->control_url));
343
            }
344
        } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
345
            /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
346
            get_word(buf1, sizeof(buf1), &p);
347
            payload_type = atoi(buf1);
348
            st = s->streams[s->nb_streams - 1];
349
            rtsp_st = st->priv_data;
350
            sdp_parse_rtpmap(s, st->codec, rtsp_st, payload_type, p);
351
        } else if (av_strstart(p, "fmtp:", &p) ||
352
                   av_strstart(p, "framesize:", &p)) {
353
            /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
354
            // let dynamic protocol handlers have a stab at the line.
355
            get_word(buf1, sizeof(buf1), &p);
356
            payload_type = atoi(buf1);
357
            for (i = 0; i < s->nb_streams; i++) {
358
                st      = s->streams[i];
359
                rtsp_st = st->priv_data;
360
                if (rtsp_st->sdp_payload_type == payload_type &&
361
                    rtsp_st->dynamic_handler &&
362
                    rtsp_st->dynamic_handler->parse_sdp_a_line)
363
                    rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
364
                        rtsp_st->dynamic_protocol_context, buf);
365
            }
366
        } else if (av_strstart(p, "range:", &p)) {
367
            int64_t start, end;
368

    
369
            // this is so that seeking on a streamed file can work.
370
            rtsp_parse_range_npt(p, &start, &end);
371
            s->start_time = start;
372
            /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
373
            s->duration   = (end == AV_NOPTS_VALUE) ?
374
                            AV_NOPTS_VALUE : end - start;
375
        } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
376
            if (atoi(p) == 1)
377
                rt->transport = RTSP_TRANSPORT_RDT;
378
        } else {
379
            if (rt->server_type == RTSP_SERVER_WMS)
380
                ff_wms_parse_sdp_a_line(s, p);
381
            if (s->nb_streams > 0) {
382
                if (rt->server_type == RTSP_SERVER_REAL)
383
                    ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
384

    
385
                rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
386
                if (rtsp_st->dynamic_handler &&
387
                    rtsp_st->dynamic_handler->parse_sdp_a_line)
388
                    rtsp_st->dynamic_handler->parse_sdp_a_line(s,
389
                        s->nb_streams - 1,
390
                        rtsp_st->dynamic_protocol_context, buf);
391
            }
392
        }
393
        break;
394
    }
395
}
396

    
397
static int sdp_parse(AVFormatContext *s, const char *content)
398
{
399
    const char *p;
400
    int letter;
401
    /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
402
     * contain long SDP lines containing complete ASF Headers (several
403
     * kB) or arrays of MDPR (RM stream descriptor) headers plus
404
     * "rulebooks" describing their properties. Therefore, the SDP line
405
     * buffer is large.
406
     *
407
     * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
408
     * in rtpdec_xiph.c. */
409
    char buf[16384], *q;
410
    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
411

    
412
    memset(s1, 0, sizeof(SDPParseState));
413
    p = content;
414
    for (;;) {
415
        p += strspn(p, SPACE_CHARS);
416
        letter = *p;
417
        if (letter == '\0')
418
            break;
419
        p++;
420
        if (*p != '=')
421
            goto next_line;
422
        p++;
423
        /* get the content */
424
        q = buf;
425
        while (*p != '\n' && *p != '\r' && *p != '\0') {
426
            if ((q - buf) < sizeof(buf) - 1)
427
                *q++ = *p;
428
            p++;
429
        }
430
        *q = '\0';
431
        sdp_parse_line(s, s1, letter, buf);
432
    next_line:
433
        while (*p != '\n' && *p != '\0')
434
            p++;
435
        if (*p == '\n')
436
            p++;
437
    }
438
    return 0;
439
}
440

    
441
/* close and free RTSP streams */
442
void ff_rtsp_close_streams(AVFormatContext *s)
443
{
444
    RTSPState *rt = s->priv_data;
445
    int i;
446
    RTSPStream *rtsp_st;
447

    
448
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
449
        rtsp_st = rt->rtsp_streams[i];
450
        if (rtsp_st) {
451
            if (rtsp_st->transport_priv) {
452
                if (s->oformat) {
453
                    AVFormatContext *rtpctx = rtsp_st->transport_priv;
454
                    av_write_trailer(rtpctx);
455
                    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
456
                        uint8_t *ptr;
457
                        url_close_dyn_buf(rtpctx->pb, &ptr);
458
                        av_free(ptr);
459
                    } else {
460
                        url_fclose(rtpctx->pb);
461
                    }
462
                    av_metadata_free(&rtpctx->streams[0]->metadata);
463
                    av_metadata_free(&rtpctx->metadata);
464
                    av_free(rtpctx->streams[0]);
465
                    av_free(rtpctx);
466
                } else if (rt->transport == RTSP_TRANSPORT_RDT)
467
                    ff_rdt_parse_close(rtsp_st->transport_priv);
468
                else
469
                    rtp_parse_close(rtsp_st->transport_priv);
470
            }
471
            if (rtsp_st->rtp_handle)
472
                url_close(rtsp_st->rtp_handle);
473
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
474
                rtsp_st->dynamic_handler->close(
475
                    rtsp_st->dynamic_protocol_context);
476
        }
477
    }
478
    av_free(rt->rtsp_streams);
479
    if (rt->asf_ctx) {
480
        av_close_input_stream (rt->asf_ctx);
481
        rt->asf_ctx = NULL;
482
    }
483
}
484

    
485
static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st,
486
                               URLContext *handle)
487
{
488
    RTSPState *rt = s->priv_data;
489
    AVFormatContext *rtpctx;
490
    int ret;
491
    AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
492

    
493
    if (!rtp_format)
494
        return NULL;
495

    
496
    /* Allocate an AVFormatContext for each output stream */
497
    rtpctx = avformat_alloc_context();
498
    if (!rtpctx)
499
        return NULL;
500

    
501
    rtpctx->oformat = rtp_format;
502
    if (!av_new_stream(rtpctx, 0)) {
503
        av_free(rtpctx);
504
        return NULL;
505
    }
506
    /* Copy the max delay setting; the rtp muxer reads this. */
507
    rtpctx->max_delay = s->max_delay;
508
    /* Copy other stream parameters. */
509
    rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
510

    
511
    /* Set the synchronized start time. */
512
    rtpctx->start_time_realtime = rt->start_time;
513

    
514
    /* Remove the local codec, link to the original codec
515
     * context instead, to give the rtp muxer access to
516
     * codec parameters. */
517
    av_free(rtpctx->streams[0]->codec);
518
    rtpctx->streams[0]->codec = st->codec;
519

    
520
    if (handle) {
521
        url_fdopen(&rtpctx->pb, handle);
522
    } else
523
        url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
524
    ret = av_write_header(rtpctx);
525

    
526
    if (ret) {
527
        if (handle) {
528
            url_fclose(rtpctx->pb);
529
        } else {
530
            uint8_t *ptr;
531
            url_close_dyn_buf(rtpctx->pb, &ptr);
532
            av_free(ptr);
533
        }
534
        av_free(rtpctx->streams[0]);
535
        av_free(rtpctx);
536
        return NULL;
537
    }
538

    
539
    /* Copy the RTP AVStream timebase back to the original AVStream */
540
    st->time_base = rtpctx->streams[0]->time_base;
541
    return rtpctx;
542
}
543

    
544
static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
545
{
546
    RTSPState *rt = s->priv_data;
547
    AVStream *st = NULL;
548

    
549
    /* open the RTP context */
550
    if (rtsp_st->stream_index >= 0)
551
        st = s->streams[rtsp_st->stream_index];
552
    if (!st)
553
        s->ctx_flags |= AVFMTCTX_NOHEADER;
554

    
555
    if (s->oformat) {
556
        rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
557
        /* Ownership of rtp_handle is passed to the rtp mux context */
558
        rtsp_st->rtp_handle = NULL;
559
    } else if (rt->transport == RTSP_TRANSPORT_RDT)
560
        rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
561
                                            rtsp_st->dynamic_protocol_context,
562
                                            rtsp_st->dynamic_handler);
563
    else
564
        rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
565
                                         rtsp_st->sdp_payload_type);
566

    
567
    if (!rtsp_st->transport_priv) {
568
         return AVERROR(ENOMEM);
569
    } else if (rt->transport != RTSP_TRANSPORT_RDT) {
570
        if (rtsp_st->dynamic_handler) {
571
            rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
572
                                           rtsp_st->dynamic_protocol_context,
573
                                           rtsp_st->dynamic_handler);
574
        }
575
    }
576

    
577
    return 0;
578
}
579

    
580
#if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
581
static int rtsp_probe(AVProbeData *p)
582
{
583
    if (av_strstart(p->filename, "rtsp:", NULL))
584
        return AVPROBE_SCORE_MAX;
585
    return 0;
586
}
587

    
588
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
589
{
590
    const char *p;
591
    int v;
592

    
593
    p = *pp;
594
    p += strspn(p, SPACE_CHARS);
595
    v = strtol(p, (char **)&p, 10);
596
    if (*p == '-') {
597
        p++;
598
        *min_ptr = v;
599
        v = strtol(p, (char **)&p, 10);
600
        *max_ptr = v;
601
    } else {
602
        *min_ptr = v;
603
        *max_ptr = v;
604
    }
605
    *pp = p;
606
}
607

    
608
/* XXX: only one transport specification is parsed */
609
static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
610
{
611
    char transport_protocol[16];
612
    char profile[16];
613
    char lower_transport[16];
614
    char parameter[16];
615
    RTSPTransportField *th;
616
    char buf[256];
617

    
618
    reply->nb_transports = 0;
619

    
620
    for (;;) {
621
        p += strspn(p, SPACE_CHARS);
622
        if (*p == '\0')
623
            break;
624

    
625
        th = &reply->transports[reply->nb_transports];
626

    
627
        get_word_sep(transport_protocol, sizeof(transport_protocol),
628
                     "/", &p);
629
        if (!strcasecmp (transport_protocol, "rtp")) {
630
            get_word_sep(profile, sizeof(profile), "/;,", &p);
631
            lower_transport[0] = '\0';
632
            /* rtp/avp/<protocol> */
633
            if (*p == '/') {
634
                get_word_sep(lower_transport, sizeof(lower_transport),
635
                             ";,", &p);
636
            }
637
            th->transport = RTSP_TRANSPORT_RTP;
638
        } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
639
                   !strcasecmp (transport_protocol, "x-real-rdt")) {
640
            /* x-pn-tng/<protocol> */
641
            get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
642
            profile[0] = '\0';
643
            th->transport = RTSP_TRANSPORT_RDT;
644
        }
645
        if (!strcasecmp(lower_transport, "TCP"))
646
            th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
647
        else
648
            th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
649

    
650
        if (*p == ';')
651
            p++;
652
        /* get each parameter */
653
        while (*p != '\0' && *p != ',') {
654
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
655
            if (!strcmp(parameter, "port")) {
656
                if (*p == '=') {
657
                    p++;
658
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
659
                }
660
            } else if (!strcmp(parameter, "client_port")) {
661
                if (*p == '=') {
662
                    p++;
663
                    rtsp_parse_range(&th->client_port_min,
664
                                     &th->client_port_max, &p);
665
                }
666
            } else if (!strcmp(parameter, "server_port")) {
667
                if (*p == '=') {
668
                    p++;
669
                    rtsp_parse_range(&th->server_port_min,
670
                                     &th->server_port_max, &p);
671
                }
672
            } else if (!strcmp(parameter, "interleaved")) {
673
                if (*p == '=') {
674
                    p++;
675
                    rtsp_parse_range(&th->interleaved_min,
676
                                     &th->interleaved_max, &p);
677
                }
678
            } else if (!strcmp(parameter, "multicast")) {
679
                if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
680
                    th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
681
            } else if (!strcmp(parameter, "ttl")) {
682
                if (*p == '=') {
683
                    p++;
684
                    th->ttl = strtol(p, (char **)&p, 10);
685
                }
686
            } else if (!strcmp(parameter, "destination")) {
687
                struct in_addr ipaddr;
688

    
689
                if (*p == '=') {
690
                    p++;
691
                    get_word_sep(buf, sizeof(buf), ";,", &p);
692
                    if (ff_inet_aton(buf, &ipaddr))
693
                        th->destination = ntohl(ipaddr.s_addr);
694
                }
695
            }
696
            while (*p != ';' && *p != '\0' && *p != ',')
697
                p++;
698
            if (*p == ';')
699
                p++;
700
        }
701
        if (*p == ',')
702
            p++;
703

    
704
        reply->nb_transports++;
705
    }
706
}
707

    
708
void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
709
                        HTTPAuthState *auth_state)
710
{
711
    const char *p;
712

    
713
    /* NOTE: we do case independent match for broken servers */
714
    p = buf;
715
    if (av_stristart(p, "Session:", &p)) {
716
        int t;
717
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
718
        if (av_stristart(p, ";timeout=", &p) &&
719
            (t = strtol(p, NULL, 10)) > 0) {
720
            reply->timeout = t;
721
        }
722
    } else if (av_stristart(p, "Content-Length:", &p)) {
723
        reply->content_length = strtol(p, NULL, 10);
724
    } else if (av_stristart(p, "Transport:", &p)) {
725
        rtsp_parse_transport(reply, p);
726
    } else if (av_stristart(p, "CSeq:", &p)) {
727
        reply->seq = strtol(p, NULL, 10);
728
    } else if (av_stristart(p, "Range:", &p)) {
729
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
730
    } else if (av_stristart(p, "RealChallenge1:", &p)) {
731
        p += strspn(p, SPACE_CHARS);
732
        av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
733
    } else if (av_stristart(p, "Server:", &p)) {
734
        p += strspn(p, SPACE_CHARS);
735
        av_strlcpy(reply->server, p, sizeof(reply->server));
736
    } else if (av_stristart(p, "Notice:", &p) ||
737
               av_stristart(p, "X-Notice:", &p)) {
738
        reply->notice = strtol(p, NULL, 10);
739
    } else if (av_stristart(p, "Location:", &p)) {
740
        p += strspn(p, SPACE_CHARS);
741
        av_strlcpy(reply->location, p , sizeof(reply->location));
742
    } else if (av_stristart(p, "WWW-Authenticate:", &p) && auth_state) {
743
        p += strspn(p, SPACE_CHARS);
744
        ff_http_auth_handle_header(auth_state, "WWW-Authenticate", p);
745
    } else if (av_stristart(p, "Authentication-Info:", &p) && auth_state) {
746
        p += strspn(p, SPACE_CHARS);
747
        ff_http_auth_handle_header(auth_state, "Authentication-Info", p);
748
    }
749
}
750

    
751
/* skip a RTP/TCP interleaved packet */
752
void ff_rtsp_skip_packet(AVFormatContext *s)
753
{
754
    RTSPState *rt = s->priv_data;
755
    int ret, len, len1;
756
    uint8_t buf[1024];
757

    
758
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
759
    if (ret != 3)
760
        return;
761
    len = AV_RB16(buf + 1);
762

    
763
    dprintf(s, "skipping RTP packet len=%d\n", len);
764

    
765
    /* skip payload */
766
    while (len > 0) {
767
        len1 = len;
768
        if (len1 > sizeof(buf))
769
            len1 = sizeof(buf);
770
        ret = url_read_complete(rt->rtsp_hd, buf, len1);
771
        if (ret != len1)
772
            return;
773
        len -= len1;
774
    }
775
}
776

    
777
int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
778
                       unsigned char **content_ptr,
779
                       int return_on_interleaved_data)
780
{
781
    RTSPState *rt = s->priv_data;
782
    char buf[4096], buf1[1024], *q;
783
    unsigned char ch;
784
    const char *p;
785
    int ret, content_length, line_count = 0;
786
    unsigned char *content = NULL;
787

    
788
    memset(reply, 0, sizeof(*reply));
789

    
790
    /* parse reply (XXX: use buffers) */
791
    rt->last_reply[0] = '\0';
792
    for (;;) {
793
        q = buf;
794
        for (;;) {
795
            ret = url_read_complete(rt->rtsp_hd, &ch, 1);
796
#ifdef DEBUG_RTP_TCP
797
            dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
798
#endif
799
            if (ret != 1)
800
                return -1;
801
            if (ch == '\n')
802
                break;
803
            if (ch == '$') {
804
                /* XXX: only parse it if first char on line ? */
805
                if (return_on_interleaved_data) {
806
                    return 1;
807
                } else
808
                    ff_rtsp_skip_packet(s);
809
            } else if (ch != '\r') {
810
                if ((q - buf) < sizeof(buf) - 1)
811
                    *q++ = ch;
812
            }
813
        }
814
        *q = '\0';
815

    
816
        dprintf(s, "line='%s'\n", buf);
817

    
818
        /* test if last line */
819
        if (buf[0] == '\0')
820
            break;
821
        p = buf;
822
        if (line_count == 0) {
823
            /* get reply code */
824
            get_word(buf1, sizeof(buf1), &p);
825
            get_word(buf1, sizeof(buf1), &p);
826
            reply->status_code = atoi(buf1);
827
            av_strlcpy(reply->reason, p, sizeof(reply->reason));
828
        } else {
829
            ff_rtsp_parse_line(reply, p, &rt->auth_state);
830
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
831
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
832
        }
833
        line_count++;
834
    }
835

    
836
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
837
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
838

    
839
    content_length = reply->content_length;
840
    if (content_length > 0) {
841
        /* leave some room for a trailing '\0' (useful for simple parsing) */
842
        content = av_malloc(content_length + 1);
843
        (void)url_read_complete(rt->rtsp_hd, content, content_length);
844
        content[content_length] = '\0';
845
    }
846
    if (content_ptr)
847
        *content_ptr = content;
848
    else
849
        av_free(content);
850

    
851
    if (rt->seq != reply->seq) {
852
        av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
853
            rt->seq, reply->seq);
854
    }
855

    
856
    /* EOS */
857
    if (reply->notice == 2101 /* End-of-Stream Reached */      ||
858
        reply->notice == 2104 /* Start-of-Stream Reached */    ||
859
        reply->notice == 2306 /* Continuous Feed Terminated */) {
860
        rt->state = RTSP_STATE_IDLE;
861
    } else if (reply->notice >= 4400 && reply->notice < 5500) {
862
        return AVERROR(EIO); /* data or server error */
863
    } else if (reply->notice == 2401 /* Ticket Expired */ ||
864
             (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
865
        return AVERROR(EPERM);
866

    
867
    return 0;
868
}
869

    
870
int ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
871
                                        const char *method, const char *url,
872
                                        const char *headers,
873
                                        const unsigned char *send_content,
874
                                        int send_content_length)
875
{
876
    RTSPState *rt = s->priv_data;
877
    char buf[4096], *out_buf;
878
    char base64buf[AV_BASE64_SIZE(sizeof(buf))];
879

    
880
    /* Add in RTSP headers */
881
    out_buf = buf;
882
    rt->seq++;
883
    snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
884
    if (headers)
885
        av_strlcat(buf, headers, sizeof(buf));
886
    av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
887
    if (rt->session_id[0] != '\0' && (!headers ||
888
        !strstr(headers, "\nIf-Match:"))) {
889
        av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
890
    }
891
    if (rt->auth[0]) {
892
        char *str = ff_http_auth_create_response(&rt->auth_state,
893
                                                 rt->auth, url, method);
894
        if (str)
895
            av_strlcat(buf, str, sizeof(buf));
896
        av_free(str);
897
    }
898
    if (send_content_length > 0 && send_content)
899
        av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
900
    av_strlcat(buf, "\r\n", sizeof(buf));
901

    
902
    /* base64 encode rtsp if tunneling */
903
    if (rt->control_transport == RTSP_MODE_TUNNEL) {
904
        av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
905
        out_buf = base64buf;
906
    }
907

    
908
    dprintf(s, "Sending:\n%s--\n", buf);
909

    
910
    url_write(rt->rtsp_hd_out, out_buf, strlen(out_buf));
911
    if (send_content_length > 0 && send_content) {
912
        if (rt->control_transport == RTSP_MODE_TUNNEL) {
913
            av_log(s, AV_LOG_ERROR, "tunneling of RTSP requests "
914
                                    "with content data not supported\n");
915
            return AVERROR_PATCHWELCOME;
916
        }
917
        url_write(rt->rtsp_hd_out, send_content, send_content_length);
918
    }
919
    rt->last_cmd_time = av_gettime();
920

    
921
    return 0;
922
}
923

    
924
int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
925
                           const char *url, const char *headers)
926
{
927
    return ff_rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
928
}
929

    
930
int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
931
                     const char *headers, RTSPMessageHeader *reply,
932
                     unsigned char **content_ptr)
933
{
934
    return ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
935
                                         content_ptr, NULL, 0);
936
}
937

    
938
int ff_rtsp_send_cmd_with_content(AVFormatContext *s,
939
                                  const char *method, const char *url,
940
                                  const char *header,
941
                                  RTSPMessageHeader *reply,
942
                                  unsigned char **content_ptr,
943
                                  const unsigned char *send_content,
944
                                  int send_content_length)
945
{
946
    RTSPState *rt = s->priv_data;
947
    HTTPAuthType cur_auth_type;
948
    int ret;
949

    
950
retry:
951
    cur_auth_type = rt->auth_state.auth_type;
952
    if ((ret = ff_rtsp_send_cmd_with_content_async(s, method, url, header,
953
                                                   send_content,
954
                                                   send_content_length)))
955
        return ret;
956

    
957
    if ((ret = ff_rtsp_read_reply(s, reply, content_ptr, 0) ) < 0)
958
        return ret;
959

    
960
    if (reply->status_code == 401 && cur_auth_type == HTTP_AUTH_NONE &&
961
        rt->auth_state.auth_type != HTTP_AUTH_NONE)
962
        goto retry;
963

    
964
    if (reply->status_code > 400){
965
        av_log(s, AV_LOG_ERROR, "method %s failed: %d%s\n",
966
               method,
967
               reply->status_code,
968
               reply->reason);
969
        av_log(s, AV_LOG_DEBUG, "%s\n", rt->last_reply);
970
    }
971

    
972
    return 0;
973
}
974

    
975
/**
976
 * @return 0 on success, <0 on error, 1 if protocol is unavailable.
977
 */
978
static int make_setup_request(AVFormatContext *s, const char *host, int port,
979
                              int lower_transport, const char *real_challenge)
980
{
981
    RTSPState *rt = s->priv_data;
982
    int rtx, j, i, err, interleave = 0;
983
    RTSPStream *rtsp_st;
984
    RTSPMessageHeader reply1, *reply = &reply1;
985
    char cmd[2048];
986
    const char *trans_pref;
987

    
988
    if (rt->transport == RTSP_TRANSPORT_RDT)
989
        trans_pref = "x-pn-tng";
990
    else
991
        trans_pref = "RTP/AVP";
992

    
993
    /* default timeout: 1 minute */
994
    rt->timeout = 60;
995

    
996
    /* for each stream, make the setup request */
997
    /* XXX: we assume the same server is used for the control of each
998
     * RTSP stream */
999

    
1000
    for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1001
        char transport[2048];
1002

    
1003
        /**
1004
         * WMS serves all UDP data over a single connection, the RTX, which
1005
         * isn't necessarily the first in the SDP but has to be the first
1006
         * to be set up, else the second/third SETUP will fail with a 461.
1007
         */
1008
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1009
             rt->server_type == RTSP_SERVER_WMS) {
1010
            if (i == 0) {
1011
                /* rtx first */
1012
                for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1013
                    int len = strlen(rt->rtsp_streams[rtx]->control_url);
1014
                    if (len >= 4 &&
1015
                        !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1016
                                "/rtx"))
1017
                        break;
1018
                }
1019
                if (rtx == rt->nb_rtsp_streams)
1020
                    return -1; /* no RTX found */
1021
                rtsp_st = rt->rtsp_streams[rtx];
1022
            } else
1023
                rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1024
        } else
1025
            rtsp_st = rt->rtsp_streams[i];
1026

    
1027
        /* RTP/UDP */
1028
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1029
            char buf[256];
1030

    
1031
            if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1032
                port = reply->transports[0].client_port_min;
1033
                goto have_port;
1034
            }
1035

    
1036
            /* first try in specified port range */
1037
            if (RTSP_RTP_PORT_MIN != 0) {
1038
                while (j <= RTSP_RTP_PORT_MAX) {
1039
                    ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1040
                                "?localport=%d", j);
1041
                    /* we will use two ports per rtp stream (rtp and rtcp) */
1042
                    j += 2;
1043
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1044
                        goto rtp_opened;
1045
                }
1046
            }
1047

    
1048
#if 0
1049
            /* then try on any port */
1050
            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1051
                err = AVERROR_INVALIDDATA;
1052
                goto fail;
1053
            }
1054
#endif
1055

    
1056
        rtp_opened:
1057
            port = rtp_get_local_port(rtsp_st->rtp_handle);
1058
        have_port:
1059
            snprintf(transport, sizeof(transport) - 1,
1060
                     "%s/UDP;", trans_pref);
1061
            if (rt->server_type != RTSP_SERVER_REAL)
1062
                av_strlcat(transport, "unicast;", sizeof(transport));
1063
            av_strlcatf(transport, sizeof(transport),
1064
                     "client_port=%d", port);
1065
            if (rt->transport == RTSP_TRANSPORT_RTP &&
1066
                !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1067
                av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1068
        }
1069

    
1070
        /* RTP/TCP */
1071
        else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1072
            /** For WMS streams, the application streams are only used for
1073
             * UDP. When trying to set it up for TCP streams, the server
1074
             * will return an error. Therefore, we skip those streams. */
1075
            if (rt->server_type == RTSP_SERVER_WMS &&
1076
                s->streams[rtsp_st->stream_index]->codec->codec_type ==
1077
                    AVMEDIA_TYPE_DATA)
1078
                continue;
1079
            snprintf(transport, sizeof(transport) - 1,
1080
                     "%s/TCP;", trans_pref);
1081
            if (rt->server_type == RTSP_SERVER_WMS)
1082
                av_strlcat(transport, "unicast;", sizeof(transport));
1083
            av_strlcatf(transport, sizeof(transport),
1084
                        "interleaved=%d-%d",
1085
                        interleave, interleave + 1);
1086
            interleave += 2;
1087
        }
1088

    
1089
        else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1090
            snprintf(transport, sizeof(transport) - 1,
1091
                     "%s/UDP;multicast", trans_pref);
1092
        }
1093
        if (s->oformat) {
1094
            av_strlcat(transport, ";mode=receive", sizeof(transport));
1095
        } else if (rt->server_type == RTSP_SERVER_REAL ||
1096
                   rt->server_type == RTSP_SERVER_WMS)
1097
            av_strlcat(transport, ";mode=play", sizeof(transport));
1098
        snprintf(cmd, sizeof(cmd),
1099
                 "Transport: %s\r\n",
1100
                 transport);
1101
        if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1102
            char real_res[41], real_csum[9];
1103
            ff_rdt_calc_response_and_checksum(real_res, real_csum,
1104
                                              real_challenge);
1105
            av_strlcatf(cmd, sizeof(cmd),
1106
                        "If-Match: %s\r\n"
1107
                        "RealChallenge2: %s, sd=%s\r\n",
1108
                        rt->session_id, real_res, real_csum);
1109
        }
1110
        ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1111
        if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1112
            err = 1;
1113
            goto fail;
1114
        } else if (reply->status_code != RTSP_STATUS_OK ||
1115
                   reply->nb_transports != 1) {
1116
            err = AVERROR_INVALIDDATA;
1117
            goto fail;
1118
        }
1119

    
1120
        /* XXX: same protocol for all streams is required */
1121
        if (i > 0) {
1122
            if (reply->transports[0].lower_transport != rt->lower_transport ||
1123
                reply->transports[0].transport != rt->transport) {
1124
                err = AVERROR_INVALIDDATA;
1125
                goto fail;
1126
            }
1127
        } else {
1128
            rt->lower_transport = reply->transports[0].lower_transport;
1129
            rt->transport = reply->transports[0].transport;
1130
        }
1131

    
1132
        /* close RTP connection if not chosen */
1133
        if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1134
            (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1135
            url_close(rtsp_st->rtp_handle);
1136
            rtsp_st->rtp_handle = NULL;
1137
        }
1138

    
1139
        switch(reply->transports[0].lower_transport) {
1140
        case RTSP_LOWER_TRANSPORT_TCP:
1141
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1142
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1143
            break;
1144

    
1145
        case RTSP_LOWER_TRANSPORT_UDP: {
1146
            char url[1024];
1147

    
1148
            /* XXX: also use address if specified */
1149
            ff_url_join(url, sizeof(url), "rtp", NULL, host,
1150
                        reply->transports[0].server_port_min, NULL);
1151
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1152
                rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1153
                err = AVERROR_INVALIDDATA;
1154
                goto fail;
1155
            }
1156
            /* Try to initialize the connection state in a
1157
             * potential NAT router by sending dummy packets.
1158
             * RTP/RTCP dummy packets are used for RDT, too.
1159
             */
1160
            if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1161
                rtp_send_punch_packets(rtsp_st->rtp_handle);
1162
            break;
1163
        }
1164
        case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1165
            char url[1024];
1166
            struct in_addr in;
1167
            int port, ttl;
1168

    
1169
            if (reply->transports[0].destination) {
1170
                in.s_addr = htonl(reply->transports[0].destination);
1171
                port      = reply->transports[0].port_min;
1172
                ttl       = reply->transports[0].ttl;
1173
            } else {
1174
                in        = rtsp_st->sdp_ip;
1175
                port      = rtsp_st->sdp_port;
1176
                ttl       = rtsp_st->sdp_ttl;
1177
            }
1178
            ff_url_join(url, sizeof(url), "rtp", NULL, inet_ntoa(in),
1179
                        port, "?ttl=%d", ttl);
1180
            if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1181
                err = AVERROR_INVALIDDATA;
1182
                goto fail;
1183
            }
1184
            break;
1185
        }
1186
        }
1187

    
1188
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1189
            goto fail;
1190
    }
1191

    
1192
    if (reply->timeout > 0)
1193
        rt->timeout = reply->timeout;
1194

    
1195
    if (rt->server_type == RTSP_SERVER_REAL)
1196
        rt->need_subscription = 1;
1197

    
1198
    return 0;
1199

    
1200
fail:
1201
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1202
        if (rt->rtsp_streams[i]->rtp_handle) {
1203
            url_close(rt->rtsp_streams[i]->rtp_handle);
1204
            rt->rtsp_streams[i]->rtp_handle = NULL;
1205
        }
1206
    }
1207
    return err;
1208
}
1209

    
1210
static int rtsp_read_play(AVFormatContext *s)
1211
{
1212
    RTSPState *rt = s->priv_data;
1213
    RTSPMessageHeader reply1, *reply = &reply1;
1214
    int i;
1215
    char cmd[1024];
1216

    
1217
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1218

    
1219
    if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1220
        if (rt->state == RTSP_STATE_PAUSED) {
1221
            cmd[0] = 0;
1222
        } else {
1223
            snprintf(cmd, sizeof(cmd),
1224
                     "Range: npt=%0.3f-\r\n",
1225
                     (double)rt->seek_timestamp / AV_TIME_BASE);
1226
        }
1227
        ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
1228
        if (reply->status_code != RTSP_STATUS_OK) {
1229
            return -1;
1230
        }
1231
        if (reply->range_start != AV_NOPTS_VALUE &&
1232
            rt->transport == RTSP_TRANSPORT_RTP) {
1233
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1234
                RTSPStream *rtsp_st = rt->rtsp_streams[i];
1235
                RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1236
                AVStream *st = NULL;
1237
                if (!rtpctx)
1238
                    continue;
1239
                if (rtsp_st->stream_index >= 0)
1240
                    st = s->streams[rtsp_st->stream_index];
1241
                rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
1242
                rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
1243
                if (st)
1244
                    rtpctx->range_start_offset = av_rescale_q(reply->range_start,
1245
                                                              AV_TIME_BASE_Q,
1246
                                                              st->time_base);
1247
            }
1248
        }
1249
    }
1250
    rt->state = RTSP_STATE_STREAMING;
1251
    return 0;
1252
}
1253

    
1254
static int rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
1255
{
1256
    RTSPState *rt = s->priv_data;
1257
    char cmd[1024];
1258
    unsigned char *content = NULL;
1259
    int ret;
1260

    
1261
    /* describe the stream */
1262
    snprintf(cmd, sizeof(cmd),
1263
             "Accept: application/sdp\r\n");
1264
    if (rt->server_type == RTSP_SERVER_REAL) {
1265
        /**
1266
         * The Require: attribute is needed for proper streaming from
1267
         * Realmedia servers.
1268
         */
1269
        av_strlcat(cmd,
1270
                   "Require: com.real.retain-entity-for-setup\r\n",
1271
                   sizeof(cmd));
1272
    }
1273
    ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
1274
    if (!content)
1275
        return AVERROR_INVALIDDATA;
1276
    if (reply->status_code != RTSP_STATUS_OK) {
1277
        av_freep(&content);
1278
        return AVERROR_INVALIDDATA;
1279
    }
1280

    
1281
    /* now we got the SDP description, we parse it */
1282
    ret = sdp_parse(s, (const char *)content);
1283
    av_freep(&content);
1284
    if (ret < 0)
1285
        return AVERROR_INVALIDDATA;
1286

    
1287
    return 0;
1288
}
1289

    
1290
static int rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
1291
{
1292
    RTSPState *rt = s->priv_data;
1293
    RTSPMessageHeader reply1, *reply = &reply1;
1294
    int i;
1295
    char *sdp;
1296
    AVFormatContext sdp_ctx, *ctx_array[1];
1297

    
1298
    rt->start_time = av_gettime();
1299

    
1300
    /* Announce the stream */
1301
    sdp = av_mallocz(SDP_MAX_SIZE);
1302
    if (sdp == NULL)
1303
        return AVERROR(ENOMEM);
1304
    /* We create the SDP based on the RTSP AVFormatContext where we
1305
     * aren't allowed to change the filename field. (We create the SDP
1306
     * based on the RTSP context since the contexts for the RTP streams
1307
     * don't exist yet.) In order to specify a custom URL with the actual
1308
     * peer IP instead of the originally specified hostname, we create
1309
     * a temporary copy of the AVFormatContext, where the custom URL is set.
1310
     *
1311
     * FIXME: Create the SDP without copying the AVFormatContext.
1312
     * This either requires setting up the RTP stream AVFormatContexts
1313
     * already here (complicating things immensely) or getting a more
1314
     * flexible SDP creation interface.
1315
     */
1316
    sdp_ctx = *s;
1317
    ff_url_join(sdp_ctx.filename, sizeof(sdp_ctx.filename),
1318
                "rtsp", NULL, addr, -1, NULL);
1319
    ctx_array[0] = &sdp_ctx;
1320
    if (avf_sdp_create(ctx_array, 1, sdp, SDP_MAX_SIZE)) {
1321
        av_free(sdp);
1322
        return AVERROR_INVALIDDATA;
1323
    }
1324
    av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
1325
    ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri,
1326
                                  "Content-Type: application/sdp\r\n",
1327
                                  reply, NULL, sdp, strlen(sdp));
1328
    av_free(sdp);
1329
    if (reply->status_code != RTSP_STATUS_OK)
1330
        return AVERROR_INVALIDDATA;
1331

    
1332
    /* Set up the RTSPStreams for each AVStream */
1333
    for (i = 0; i < s->nb_streams; i++) {
1334
        RTSPStream *rtsp_st;
1335
        AVStream *st = s->streams[i];
1336

    
1337
        rtsp_st = av_mallocz(sizeof(RTSPStream));
1338
        if (!rtsp_st)
1339
            return AVERROR(ENOMEM);
1340
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
1341

    
1342
        st->priv_data = rtsp_st;
1343
        rtsp_st->stream_index = i;
1344

    
1345
        av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
1346
        /* Note, this must match the relative uri set in the sdp content */
1347
        av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
1348
                    "/streamid=%d", i);
1349
    }
1350

    
1351
    return 0;
1352
}
1353

    
1354
void ff_rtsp_close_connections(AVFormatContext *s)
1355
{
1356
    RTSPState *rt = s->priv_data;
1357
    if (rt->rtsp_hd_out != rt->rtsp_hd) url_close(rt->rtsp_hd_out);
1358
    url_close(rt->rtsp_hd);
1359
    rt->rtsp_hd = rt->rtsp_hd_out = NULL;
1360
}
1361

    
1362
int ff_rtsp_connect(AVFormatContext *s)
1363
{
1364
    RTSPState *rt = s->priv_data;
1365
    char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1366
    char *option_list, *option, *filename;
1367
    int port, err, tcp_fd;
1368
    RTSPMessageHeader reply1 = {0}, *reply = &reply1;
1369
    int lower_transport_mask = 0;
1370
    char real_challenge[64];
1371
    struct sockaddr_storage peer;
1372
    socklen_t peer_len = sizeof(peer);
1373

    
1374
    if (!ff_network_init())
1375
        return AVERROR(EIO);
1376
redirect:
1377
    rt->control_transport = RTSP_MODE_PLAIN;
1378
    /* extract hostname and port */
1379
    av_url_split(NULL, 0, auth, sizeof(auth),
1380
                 host, sizeof(host), &port, path, sizeof(path), s->filename);
1381
    if (*auth) {
1382
        av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1383
    }
1384
    if (port < 0)
1385
        port = RTSP_DEFAULT_PORT;
1386

    
1387
    /* search for options */
1388
    option_list = strrchr(path, '?');
1389
    if (option_list) {
1390
        /* Strip out the RTSP specific options, write out the rest of
1391
         * the options back into the same string. */
1392
        filename = option_list;
1393
        while (option_list) {
1394
            /* move the option pointer */
1395
            option = ++option_list;
1396
            option_list = strchr(option_list, '&');
1397
            if (option_list)
1398
                *option_list = 0;
1399

    
1400
            /* handle the options */
1401
            if (!strcmp(option, "udp")) {
1402
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP);
1403
            } else if (!strcmp(option, "multicast")) {
1404
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1405
            } else if (!strcmp(option, "tcp")) {
1406
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1407
            } else if(!strcmp(option, "http")) {
1408
                lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1409
                rt->control_transport = RTSP_MODE_TUNNEL;
1410
            } else {
1411
                /* Write options back into the buffer, using memmove instead
1412
                 * of strcpy since the strings may overlap. */
1413
                int len = strlen(option);
1414
                memmove(++filename, option, len);
1415
                filename += len;
1416
                if (option_list) *filename = '&';
1417
            }
1418
        }
1419
        *filename = 0;
1420
    }
1421

    
1422
    if (!lower_transport_mask)
1423
        lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1424

    
1425
    if (s->oformat) {
1426
        /* Only UDP or TCP - UDP multicast isn't supported. */
1427
        lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1428
                                (1 << RTSP_LOWER_TRANSPORT_TCP);
1429
        if (!lower_transport_mask || rt->control_transport == RTSP_MODE_TUNNEL) {
1430
            av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1431
                                    "only UDP and TCP are supported for output.\n");
1432
            err = AVERROR(EINVAL);
1433
            goto fail;
1434
        }
1435
    }
1436

    
1437
    /* Construct the URI used in request; this is similar to s->filename,
1438
     * but with authentication credentials removed and RTSP specific options
1439
     * stripped out. */
1440
    ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1441
                host, port, "%s", path);
1442

    
1443
    if (rt->control_transport == RTSP_MODE_TUNNEL) {
1444
        /* set up initial handshake for tunneling */
1445
        char httpname[1024];
1446
        char sessioncookie[17];
1447
        char headers[1024];
1448

    
1449
        ff_url_join(httpname, sizeof(httpname), "http", auth, host, port, "%s", path);
1450
        snprintf(sessioncookie, sizeof(sessioncookie), "%08x%08x",
1451
                 av_get_random_seed(), av_get_random_seed());
1452

    
1453
        /* GET requests */
1454
        if (url_alloc(&rt->rtsp_hd, httpname, URL_RDONLY) < 0) {
1455
            err = AVERROR(EIO);
1456
            goto fail;
1457
        }
1458

    
1459
        /* generate GET headers */
1460
        snprintf(headers, sizeof(headers),
1461
                 "x-sessioncookie: %s\r\n"
1462
                 "Accept: application/x-rtsp-tunnelled\r\n"
1463
                 "Pragma: no-cache\r\n"
1464
                 "Cache-Control: no-cache\r\n",
1465
                 sessioncookie);
1466
        ff_http_set_headers(rt->rtsp_hd, headers);
1467

    
1468
        /* complete the connection */
1469
        if (url_connect(rt->rtsp_hd)) {
1470
            err = AVERROR(EIO);
1471
            goto fail;
1472
        }
1473

    
1474
        /* POST requests */
1475
        if (url_alloc(&rt->rtsp_hd_out, httpname, URL_WRONLY) < 0 ) {
1476
            err = AVERROR(EIO);
1477
            goto fail;
1478
        }
1479

    
1480
        /* generate POST headers */
1481
        snprintf(headers, sizeof(headers),
1482
                 "x-sessioncookie: %s\r\n"
1483
                 "Content-Type: application/x-rtsp-tunnelled\r\n"
1484
                 "Pragma: no-cache\r\n"
1485
                 "Cache-Control: no-cache\r\n"
1486
                 "Content-Length: 32767\r\n"
1487
                 "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
1488
                 sessioncookie);
1489
        ff_http_set_headers(rt->rtsp_hd_out, headers);
1490
        ff_http_set_chunked_transfer_encoding(rt->rtsp_hd_out, 0);
1491

    
1492
        /* Initialize the authentication state for the POST session. The HTTP
1493
         * protocol implementation doesn't properly handle multi-pass
1494
         * authentication for POST requests, since it would require one of
1495
         * the following:
1496
         * - implementing Expect: 100-continue, which many HTTP servers
1497
         *   don't support anyway, even less the RTSP servers that do HTTP
1498
         *   tunneling
1499
         * - sending the whole POST data until getting a 401 reply specifying
1500
         *   what authentication method to use, then resending all that data
1501
         * - waiting for potential 401 replies directly after sending the
1502
         *   POST header (waiting for some unspecified time)
1503
         * Therefore, we copy the full auth state, which works for both basic
1504
         * and digest. (For digest, we would have to synchronize the nonce
1505
         * count variable between the two sessions, if we'd do more requests
1506
         * with the original session, though.)
1507
         */
1508
        ff_http_init_auth_state(rt->rtsp_hd_out, rt->rtsp_hd);
1509

    
1510
        /* complete the connection */
1511
        if (url_connect(rt->rtsp_hd_out)) {
1512
            err = AVERROR(EIO);
1513
            goto fail;
1514
        }
1515
    } else {
1516
        /* open the tcp connection */
1517
        ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
1518
        if (url_open(&rt->rtsp_hd, tcpname, URL_RDWR) < 0) {
1519
            err = AVERROR(EIO);
1520
            goto fail;
1521
        }
1522
        rt->rtsp_hd_out = rt->rtsp_hd;
1523
    }
1524
    rt->seq = 0;
1525

    
1526
    tcp_fd = url_get_file_handle(rt->rtsp_hd);
1527
    if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1528
        getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1529
                    NULL, 0, NI_NUMERICHOST);
1530
    }
1531

    
1532
    /* request options supported by the server; this also detects server
1533
     * type */
1534
    for (rt->server_type = RTSP_SERVER_RTP;;) {
1535
        cmd[0] = 0;
1536
        if (rt->server_type == RTSP_SERVER_REAL)
1537
            av_strlcat(cmd,
1538
                       /**
1539
                        * The following entries are required for proper
1540
                        * streaming from a Realmedia server. They are
1541
                        * interdependent in some way although we currently
1542
                        * don't quite understand how. Values were copied
1543
                        * from mplayer SVN r23589.
1544
                        * @param CompanyID is a 16-byte ID in base64
1545
                        * @param ClientChallenge is a 16-byte ID in hex
1546
                        */
1547
                       "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1548
                       "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1549
                       "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1550
                       "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1551
                       sizeof(cmd));
1552
        ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1553
        if (reply->status_code != RTSP_STATUS_OK) {
1554
            err = AVERROR_INVALIDDATA;
1555
            goto fail;
1556
        }
1557

    
1558
        /* detect server type if not standard-compliant RTP */
1559
        if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1560
            rt->server_type = RTSP_SERVER_REAL;
1561
            continue;
1562
        } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1563
            rt->server_type = RTSP_SERVER_WMS;
1564
        } else if (rt->server_type == RTSP_SERVER_REAL)
1565
            strcpy(real_challenge, reply->real_challenge);
1566
        break;
1567
    }
1568

    
1569
    if (s->iformat)
1570
        err = rtsp_setup_input_streams(s, reply);
1571
    else
1572
        err = rtsp_setup_output_streams(s, host);
1573
    if (err)
1574
        goto fail;
1575

    
1576
    do {
1577
        int lower_transport = ff_log2_tab[lower_transport_mask &
1578
                                  ~(lower_transport_mask - 1)];
1579

    
1580
        err = make_setup_request(s, host, port, lower_transport,
1581
                                 rt->server_type == RTSP_SERVER_REAL ?
1582
                                     real_challenge : NULL);
1583
        if (err < 0)
1584
            goto fail;
1585
        lower_transport_mask &= ~(1 << lower_transport);
1586
        if (lower_transport_mask == 0 && err == 1) {
1587
            err = FF_NETERROR(EPROTONOSUPPORT);
1588
            goto fail;
1589
        }
1590
    } while (err);
1591

    
1592
    rt->state = RTSP_STATE_IDLE;
1593
    rt->seek_timestamp = 0; /* default is to start stream at position zero */
1594
    return 0;
1595
 fail:
1596
    ff_rtsp_close_streams(s);
1597
    ff_rtsp_close_connections(s);
1598
    if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1599
        av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1600
        av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1601
               reply->status_code,
1602
               s->filename);
1603
        goto redirect;
1604
    }
1605
    ff_network_close();
1606
    return err;
1607
}
1608
#endif
1609

    
1610
#if CONFIG_RTSP_DEMUXER
1611
static int rtsp_read_header(AVFormatContext *s,
1612
                            AVFormatParameters *ap)
1613
{
1614
    int ret;
1615

    
1616
    ret = ff_rtsp_connect(s);
1617
    if (ret)
1618
        return ret;
1619

    
1620
    if (ap->initial_pause) {
1621
         /* do not start immediately */
1622
    } else {
1623
         if (rtsp_read_play(s) < 0) {
1624
            ff_rtsp_close_streams(s);
1625
            ff_rtsp_close_connections(s);
1626
            return AVERROR_INVALIDDATA;
1627
        }
1628
    }
1629

    
1630
    return 0;
1631
}
1632

    
1633
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1634
                           uint8_t *buf, int buf_size)
1635
{
1636
    RTSPState *rt = s->priv_data;
1637
    RTSPStream *rtsp_st;
1638
    fd_set rfds;
1639
    int fd, fd_max, n, i, ret, tcp_fd, timeout_cnt = 0;
1640
    struct timeval tv;
1641

    
1642
    for (;;) {
1643
        if (url_interrupt_cb())
1644
            return AVERROR(EINTR);
1645
        FD_ZERO(&rfds);
1646
        if (rt->rtsp_hd) {
1647
            tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1648
            FD_SET(tcp_fd, &rfds);
1649
        } else {
1650
            fd_max = 0;
1651
            tcp_fd = -1;
1652
        }
1653
        for (i = 0; i < rt->nb_rtsp_streams; i++) {
1654
            rtsp_st = rt->rtsp_streams[i];
1655
            if (rtsp_st->rtp_handle) {
1656
                /* currently, we cannot probe RTCP handle because of
1657
                 * blocking restrictions */
1658
                fd = url_get_file_handle(rtsp_st->rtp_handle);
1659
                if (fd > fd_max)
1660
                    fd_max = fd;
1661
                FD_SET(fd, &rfds);
1662
            }
1663
        }
1664
        tv.tv_sec = 0;
1665
        tv.tv_usec = SELECT_TIMEOUT_MS * 1000;
1666
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1667
        if (n > 0) {
1668
            timeout_cnt = 0;
1669
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1670
                rtsp_st = rt->rtsp_streams[i];
1671
                if (rtsp_st->rtp_handle) {
1672
                    fd = url_get_file_handle(rtsp_st->rtp_handle);
1673
                    if (FD_ISSET(fd, &rfds)) {
1674
                        ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1675
                        if (ret > 0) {
1676
                            *prtsp_st = rtsp_st;
1677
                            return ret;
1678
                        }
1679
                    }
1680
                }
1681
            }
1682
#if CONFIG_RTSP_DEMUXER
1683
            if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1684
                RTSPMessageHeader reply;
1685

    
1686
                ret = ff_rtsp_read_reply(s, &reply, NULL, 0);
1687
                if (ret < 0)
1688
                    return ret;
1689
                /* XXX: parse message */
1690
                if (rt->state != RTSP_STATE_STREAMING)
1691
                    return 0;
1692
            }
1693
#endif
1694
        } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1695
            return FF_NETERROR(ETIMEDOUT);
1696
        } else if (n < 0 && errno != EINTR)
1697
            return AVERROR(errno);
1698
    }
1699
}
1700

    
1701
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1702
                           uint8_t *buf, int buf_size)
1703
{
1704
    RTSPState *rt = s->priv_data;
1705
    int id, len, i, ret;
1706
    RTSPStream *rtsp_st;
1707

    
1708
#ifdef DEBUG_RTP_TCP
1709
    dprintf(s, "tcp_read_packet:\n");
1710
#endif
1711
redo:
1712
    for (;;) {
1713
        RTSPMessageHeader reply;
1714

    
1715
        ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
1716
        if (ret == -1)
1717
            return -1;
1718
        if (ret == 1) /* received '$' */
1719
            break;
1720
        /* XXX: parse message */
1721
        if (rt->state != RTSP_STATE_STREAMING)
1722
            return 0;
1723
    }
1724
    ret = url_read_complete(rt->rtsp_hd, buf, 3);
1725
    if (ret != 3)
1726
        return -1;
1727
    id  = buf[0];
1728
    len = AV_RB16(buf + 1);
1729
#ifdef DEBUG_RTP_TCP
1730
    dprintf(s, "id=%d len=%d\n", id, len);
1731
#endif
1732
    if (len > buf_size || len < 12)
1733
        goto redo;
1734
    /* get the data */
1735
    ret = url_read_complete(rt->rtsp_hd, buf, len);
1736
    if (ret != len)
1737
        return -1;
1738
    if (rt->transport == RTSP_TRANSPORT_RDT &&
1739
        ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1740
        return -1;
1741

    
1742
    /* find the matching stream */
1743
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
1744
        rtsp_st = rt->rtsp_streams[i];
1745
        if (id >= rtsp_st->interleaved_min &&
1746
            id <= rtsp_st->interleaved_max)
1747
            goto found;
1748
    }
1749
    goto redo;
1750
found:
1751
    *prtsp_st = rtsp_st;
1752
    return len;
1753
}
1754

    
1755
static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1756
{
1757
    RTSPState *rt = s->priv_data;
1758
    int ret, len;
1759
    uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1760
    RTSPStream *rtsp_st;
1761

    
1762
    /* get next frames from the same RTP packet */
1763
    if (rt->cur_transport_priv) {
1764
        if (rt->transport == RTSP_TRANSPORT_RDT) {
1765
            ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1766
        } else
1767
            ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1768
        if (ret == 0) {
1769
            rt->cur_transport_priv = NULL;
1770
            return 0;
1771
        } else if (ret == 1) {
1772
            return 0;
1773
        } else
1774
            rt->cur_transport_priv = NULL;
1775
    }
1776

    
1777
    /* read next RTP packet */
1778
 redo:
1779
    switch(rt->lower_transport) {
1780
    default:
1781
#if CONFIG_RTSP_DEMUXER
1782
    case RTSP_LOWER_TRANSPORT_TCP:
1783
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1784
        break;
1785
#endif
1786
    case RTSP_LOWER_TRANSPORT_UDP:
1787
    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1788
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1789
        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1790
            rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1791
        break;
1792
    }
1793
    if (len < 0)
1794
        return len;
1795
    if (len == 0)
1796
        return AVERROR_EOF;
1797
    if (rt->transport == RTSP_TRANSPORT_RDT) {
1798
        ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1799
    } else {
1800
        ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1801
        if (ret < 0) {
1802
            /* Either bad packet, or a RTCP packet. Check if the
1803
             * first_rtcp_ntp_time field was initialized. */
1804
            RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1805
            if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
1806
                /* first_rtcp_ntp_time has been initialized for this stream,
1807
                 * copy the same value to all other uninitialized streams,
1808
                 * in order to map their timestamp origin to the same ntp time
1809
                 * as this one. */
1810
                int i;
1811
                for (i = 0; i < rt->nb_rtsp_streams; i++) {
1812
                    RTPDemuxContext *rtpctx2 = rtsp_st->transport_priv;
1813
                    if (rtpctx2 &&
1814
                        rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE)
1815
                        rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
1816
                }
1817
            }
1818
        }
1819
    }
1820
    if (ret < 0)
1821
        goto redo;
1822
    if (ret == 1)
1823
        /* more packets may follow, so we save the RTP context */
1824
        rt->cur_transport_priv = rtsp_st->transport_priv;
1825

    
1826
    return ret;
1827
}
1828

    
1829
static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1830
{
1831
    RTSPState *rt = s->priv_data;
1832
    int ret;
1833
    RTSPMessageHeader reply1, *reply = &reply1;
1834
    char cmd[1024];
1835

    
1836
    if (rt->server_type == RTSP_SERVER_REAL) {
1837
        int i;
1838
        enum AVDiscard cache[MAX_STREAMS];
1839

    
1840
        for (i = 0; i < s->nb_streams; i++)
1841
            cache[i] = s->streams[i]->discard;
1842

    
1843
        if (!rt->need_subscription) {
1844
            if (memcmp (cache, rt->real_setup_cache,
1845
                        sizeof(enum AVDiscard) * s->nb_streams)) {
1846
                snprintf(cmd, sizeof(cmd),
1847
                         "Unsubscribe: %s\r\n",
1848
                         rt->last_subscription);
1849
                ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1850
                                 cmd, reply, NULL);
1851
                if (reply->status_code != RTSP_STATUS_OK)
1852
                    return AVERROR_INVALIDDATA;
1853
                rt->need_subscription = 1;
1854
            }
1855
        }
1856

    
1857
        if (rt->need_subscription) {
1858
            int r, rule_nr, first = 1;
1859

    
1860
            memcpy(rt->real_setup_cache, cache,
1861
                   sizeof(enum AVDiscard) * s->nb_streams);
1862
            rt->last_subscription[0] = 0;
1863

    
1864
            snprintf(cmd, sizeof(cmd),
1865
                     "Subscribe: ");
1866
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1867
                rule_nr = 0;
1868
                for (r = 0; r < s->nb_streams; r++) {
1869
                    if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1870
                        if (s->streams[r]->discard != AVDISCARD_ALL) {
1871
                            if (!first)
1872
                                av_strlcat(rt->last_subscription, ",",
1873
                                           sizeof(rt->last_subscription));
1874
                            ff_rdt_subscribe_rule(
1875
                                rt->last_subscription,
1876
                                sizeof(rt->last_subscription), i, rule_nr);
1877
                            first = 0;
1878
                        }
1879
                        rule_nr++;
1880
                    }
1881
                }
1882
            }
1883
            av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1884
            ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1885
                             cmd, reply, NULL);
1886
            if (reply->status_code != RTSP_STATUS_OK)
1887
                return AVERROR_INVALIDDATA;
1888
            rt->need_subscription = 0;
1889

    
1890
            if (rt->state == RTSP_STATE_STREAMING)
1891
                rtsp_read_play (s);
1892
        }
1893
    }
1894

    
1895
    ret = rtsp_fetch_packet(s, pkt);
1896
    if (ret < 0)
1897
        return ret;
1898

    
1899
    /* send dummy request to keep TCP connection alive */
1900
    if ((rt->server_type == RTSP_SERVER_WMS ||
1901
         rt->server_type == RTSP_SERVER_REAL) &&
1902
        (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1903
        if (rt->server_type == RTSP_SERVER_WMS) {
1904
            ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
1905
        } else {
1906
            ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
1907
        }
1908
    }
1909

    
1910
    return 0;
1911
}
1912

    
1913
/* pause the stream */
1914
static int rtsp_read_pause(AVFormatContext *s)
1915
{
1916
    RTSPState *rt = s->priv_data;
1917
    RTSPMessageHeader reply1, *reply = &reply1;
1918

    
1919
    if (rt->state != RTSP_STATE_STREAMING)
1920
        return 0;
1921
    else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1922
        ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
1923
        if (reply->status_code != RTSP_STATUS_OK) {
1924
            return -1;
1925
        }
1926
    }
1927
    rt->state = RTSP_STATE_PAUSED;
1928
    return 0;
1929
}
1930

    
1931
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1932
                          int64_t timestamp, int flags)
1933
{
1934
    RTSPState *rt = s->priv_data;
1935

    
1936
    rt->seek_timestamp = av_rescale_q(timestamp,
1937
                                      s->streams[stream_index]->time_base,
1938
                                      AV_TIME_BASE_Q);
1939
    switch(rt->state) {
1940
    default:
1941
    case RTSP_STATE_IDLE:
1942
        break;
1943
    case RTSP_STATE_STREAMING:
1944
        if (rtsp_read_pause(s) != 0)
1945
            return -1;
1946
        rt->state = RTSP_STATE_SEEKING;
1947
        if (rtsp_read_play(s) != 0)
1948
            return -1;
1949
        break;
1950
    case RTSP_STATE_PAUSED:
1951
        rt->state = RTSP_STATE_IDLE;
1952
        break;
1953
    }
1954
    return 0;
1955
}
1956

    
1957
static int rtsp_read_close(AVFormatContext *s)
1958
{
1959
    RTSPState *rt = s->priv_data;
1960

    
1961
#if 0
1962
    /* NOTE: it is valid to flush the buffer here */
1963
    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1964
        url_fclose(&rt->rtsp_gb);
1965
    }
1966
#endif
1967
    ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
1968

    
1969
    ff_rtsp_close_streams(s);
1970
    ff_rtsp_close_connections(s);
1971
    ff_network_close();
1972
    return 0;
1973
}
1974

    
1975
AVInputFormat rtsp_demuxer = {
1976
    "rtsp",
1977
    NULL_IF_CONFIG_SMALL("RTSP input format"),
1978
    sizeof(RTSPState),
1979
    rtsp_probe,
1980
    rtsp_read_header,
1981
    rtsp_read_packet,
1982
    rtsp_read_close,
1983
    rtsp_read_seek,
1984
    .flags = AVFMT_NOFILE,
1985
    .read_play = rtsp_read_play,
1986
    .read_pause = rtsp_read_pause,
1987
};
1988
#endif
1989

    
1990
static int sdp_probe(AVProbeData *p1)
1991
{
1992
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1993

    
1994
    /* we look for a line beginning "c=IN IP4" */
1995
    while (p < p_end && *p != '\0') {
1996
        if (p + sizeof("c=IN IP4") - 1 < p_end &&
1997
            av_strstart(p, "c=IN IP4", NULL))
1998
            return AVPROBE_SCORE_MAX / 2;
1999

    
2000
        while (p < p_end - 1 && *p != '\n') p++;
2001
        if (++p >= p_end)
2002
            break;
2003
        if (*p == '\r')
2004
            p++;
2005
    }
2006
    return 0;
2007
}
2008

    
2009
static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
2010
{
2011
    RTSPState *rt = s->priv_data;
2012
    RTSPStream *rtsp_st;
2013
    int size, i, err;
2014
    char *content;
2015
    char url[1024];
2016

    
2017
    if (!ff_network_init())
2018
        return AVERROR(EIO);
2019

    
2020
    /* read the whole sdp file */
2021
    /* XXX: better loading */
2022
    content = av_malloc(SDP_MAX_SIZE);
2023
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
2024
    if (size <= 0) {
2025
        av_free(content);
2026
        return AVERROR_INVALIDDATA;
2027
    }
2028
    content[size] ='\0';
2029

    
2030
    sdp_parse(s, content);
2031
    av_free(content);
2032

    
2033
    /* open each RTP stream */
2034
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
2035
        rtsp_st = rt->rtsp_streams[i];
2036

    
2037
        ff_url_join(url, sizeof(url), "rtp", NULL,
2038
                    inet_ntoa(rtsp_st->sdp_ip), rtsp_st->sdp_port,
2039
                    "?localport=%d&ttl=%d", rtsp_st->sdp_port,
2040
                    rtsp_st->sdp_ttl);
2041
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
2042
            err = AVERROR_INVALIDDATA;
2043
            goto fail;
2044
        }
2045
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
2046
            goto fail;
2047
    }
2048
    return 0;
2049
fail:
2050
    ff_rtsp_close_streams(s);
2051
    ff_network_close();
2052
    return err;
2053
}
2054

    
2055
static int sdp_read_close(AVFormatContext *s)
2056
{
2057
    ff_rtsp_close_streams(s);
2058
    ff_network_close();
2059
    return 0;
2060
}
2061

    
2062
AVInputFormat sdp_demuxer = {
2063
    "sdp",
2064
    NULL_IF_CONFIG_SMALL("SDP"),
2065
    sizeof(RTSPState),
2066
    sdp_probe,
2067
    sdp_read_header,
2068
    rtsp_fetch_packet,
2069
    sdp_read_close,
2070
};