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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
/* needed by inet_aton() */
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#define _SVID_SOURCE
24

    
25
#include "libavutil/avstring.h"
26
#include "avformat.h"
27

    
28
#include <sys/time.h>
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
32
#include <strings.h>
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#include "network.h"
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#include "rtsp.h"
35

    
36
#include "rtp_internal.h"
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#include "rdt.h"
38

    
39
//#define DEBUG
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//#define DEBUG_RTP_TCP
41

    
42
enum RTSPClientState {
43
    RTSP_STATE_IDLE,
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    RTSP_STATE_PLAYING,
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    RTSP_STATE_PAUSED,
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};
47

    
48
enum RTSPServerType {
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    RTSP_SERVER_RTP,  /*< Standard-compliant RTP-server */
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    RTSP_SERVER_REAL, /*< Realmedia-style server */
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    RTSP_SERVER_LAST
52
};
53

    
54
enum RTSPTransport {
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    RTSP_TRANSPORT_RTP,
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    RTSP_TRANSPORT_RDT,
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    RTSP_TRANSPORT_LAST
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};
59

    
60
typedef struct RTSPState {
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    URLContext *rtsp_hd; /* RTSP TCP connexion handle */
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    int nb_rtsp_streams;
63
    struct RTSPStream **rtsp_streams;
64

    
65
    enum RTSPClientState state;
66
    int64_t seek_timestamp;
67

    
68
    /* XXX: currently we use unbuffered input */
69
    //    ByteIOContext rtsp_gb;
70
    int seq;        /* RTSP command sequence number */
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    char session_id[512];
72
    enum RTSPTransport transport;
73
    enum RTSPLowerTransport lower_transport;
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    enum RTSPServerType server_type;
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    char last_reply[2048]; /* XXX: allocate ? */
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    void *cur_tx;
77
    int need_subscription;
78
} RTSPState;
79

    
80
typedef struct RTSPStream {
81
    URLContext *rtp_handle; /* RTP stream handle */
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    void *tx_ctx; /* RTP/RDT parse context */
83

    
84
    int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
85
    int interleaved_min, interleaved_max;  /* interleave ids, if TCP transport */
86
    char control_url[1024]; /* url for this stream (from SDP) */
87

    
88
    int sdp_port; /* port (from SDP content - not used in RTSP) */
89
    struct in_addr sdp_ip; /* IP address  (from SDP content - not used in RTSP) */
90
    int sdp_ttl;  /* IP TTL (from SDP content - not used in RTSP) */
91
    int sdp_payload_type; /* payload type - only used in SDP */
92
    rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
93

    
94
    RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
95
    PayloadContext *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
96
} RTSPStream;
97

    
98
static int rtsp_read_play(AVFormatContext *s);
99

    
100
/* XXX: currently, the only way to change the protocols consists in
101
   changing this variable */
102

    
103
#if LIBAVFORMAT_VERSION_INT < (53 << 16)
104
int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
105
#endif
106

    
107
static int rtsp_probe(AVProbeData *p)
108
{
109
    if (av_strstart(p->filename, "rtsp:", NULL))
110
        return AVPROBE_SCORE_MAX;
111
    return 0;
112
}
113

    
114
static int redir_isspace(int c)
115
{
116
    return c == ' ' || c == '\t' || c == '\n' || c == '\r';
117
}
118

    
119
static void skip_spaces(const char **pp)
120
{
121
    const char *p;
122
    p = *pp;
123
    while (redir_isspace(*p))
124
        p++;
125
    *pp = p;
126
}
127

    
128
static void get_word_sep(char *buf, int buf_size, const char *sep,
129
                         const char **pp)
130
{
131
    const char *p;
132
    char *q;
133

    
134
    p = *pp;
135
    if (*p == '/')
136
        p++;
137
    skip_spaces(&p);
138
    q = buf;
139
    while (!strchr(sep, *p) && *p != '\0') {
140
        if ((q - buf) < buf_size - 1)
141
            *q++ = *p;
142
        p++;
143
    }
144
    if (buf_size > 0)
145
        *q = '\0';
146
    *pp = p;
147
}
148

    
149
static void get_word(char *buf, int buf_size, const char **pp)
150
{
151
    const char *p;
152
    char *q;
153

    
154
    p = *pp;
155
    skip_spaces(&p);
156
    q = buf;
157
    while (!redir_isspace(*p) && *p != '\0') {
158
        if ((q - buf) < buf_size - 1)
159
            *q++ = *p;
160
        p++;
161
    }
162
    if (buf_size > 0)
163
        *q = '\0';
164
    *pp = p;
165
}
166

    
167
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
168
   params>] */
169
static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
170
{
171
    char buf[256];
172
    int i;
173
    AVCodec *c;
174
    const char *c_name;
175

    
176
    /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
177
       see if we can handle this kind of payload */
178
    get_word_sep(buf, sizeof(buf), "/", &p);
179
    if (payload_type >= RTP_PT_PRIVATE) {
180
        RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
181
        while(handler) {
182
            if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
183
                codec->codec_id = handler->codec_id;
184
                rtsp_st->dynamic_handler= handler;
185
                if(handler->open) {
186
                    rtsp_st->dynamic_protocol_context= handler->open();
187
                }
188
                break;
189
            }
190
            handler= handler->next;
191
        }
192
    } else {
193
        /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
194
        /* search into AVRtpPayloadTypes[] */
195
        codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
196
    }
197

    
198
    c = avcodec_find_decoder(codec->codec_id);
199
    if (c && c->name)
200
        c_name = c->name;
201
    else
202
        c_name = (char *)NULL;
203

    
204
    if (c_name) {
205
        get_word_sep(buf, sizeof(buf), "/", &p);
206
        i = atoi(buf);
207
        switch (codec->codec_type) {
208
            case CODEC_TYPE_AUDIO:
209
                av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
210
                codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
211
                codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
212
                if (i > 0) {
213
                    codec->sample_rate = i;
214
                    get_word_sep(buf, sizeof(buf), "/", &p);
215
                    i = atoi(buf);
216
                    if (i > 0)
217
                        codec->channels = i;
218
                    // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
219
                    //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
220
                }
221
                av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
222
                av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
223
                break;
224
            case CODEC_TYPE_VIDEO:
225
                av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
226
                break;
227
            default:
228
                break;
229
        }
230
        return 0;
231
    }
232

    
233
    return -1;
234
}
235

    
236
/* return the length and optionnaly the data */
237
static int hex_to_data(uint8_t *data, const char *p)
238
{
239
    int c, len, v;
240

    
241
    len = 0;
242
    v = 1;
243
    for(;;) {
244
        skip_spaces(&p);
245
        if (p == '\0')
246
            break;
247
        c = toupper((unsigned char)*p++);
248
        if (c >= '0' && c <= '9')
249
            c = c - '0';
250
        else if (c >= 'A' && c <= 'F')
251
            c = c - 'A' + 10;
252
        else
253
            break;
254
        v = (v << 4) | c;
255
        if (v & 0x100) {
256
            if (data)
257
                data[len] = v;
258
            len++;
259
            v = 1;
260
        }
261
    }
262
    return len;
263
}
264

    
265
static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
266
{
267
    switch (codec->codec_id) {
268
        case CODEC_ID_MPEG4:
269
        case CODEC_ID_AAC:
270
            if (!strcmp(attr, "config")) {
271
                /* decode the hexa encoded parameter */
272
                int len = hex_to_data(NULL, value);
273
                codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
274
                if (!codec->extradata)
275
                    return;
276
                codec->extradata_size = len;
277
                hex_to_data(codec->extradata, value);
278
            }
279
            break;
280
        default:
281
            break;
282
    }
283
    return;
284
}
285

    
286
typedef struct attrname_map
287
{
288
    const char *str;
289
    uint16_t type;
290
    uint32_t offset;
291
} attrname_map_t;
292

    
293
/* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
294
#define ATTR_NAME_TYPE_INT 0
295
#define ATTR_NAME_TYPE_STR 1
296
static const attrname_map_t attr_names[]=
297
{
298
    {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
299
    {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
300
    {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
301
    {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
302
    {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
303
    {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
304
    {NULL, -1, -1},
305
};
306

    
307
/** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
308
* because it is used in rtp_h264.c, which is forthcoming.
309
*/
310
int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
311
{
312
    skip_spaces(p);
313
    if(**p)
314
    {
315
        get_word_sep(attr, attr_size, "=", p);
316
        if (**p == '=')
317
            (*p)++;
318
        get_word_sep(value, value_size, ";", p);
319
        if (**p == ';')
320
            (*p)++;
321
        return 1;
322
    }
323
    return 0;
324
}
325

    
326
/* parse a SDP line and save stream attributes */
327
static void sdp_parse_fmtp(AVStream *st, const char *p)
328
{
329
    char attr[256];
330
    char value[4096];
331
    int i;
332

    
333
    RTSPStream *rtsp_st = st->priv_data;
334
    AVCodecContext *codec = st->codec;
335
    rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
336

    
337
    /* loop on each attribute */
338
    while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
339
    {
340
        /* grab the codec extra_data from the config parameter of the fmtp line */
341
        sdp_parse_fmtp_config(codec, attr, value);
342
        /* Looking for a known attribute */
343
        for (i = 0; attr_names[i].str; ++i) {
344
            if (!strcasecmp(attr, attr_names[i].str)) {
345
                if (attr_names[i].type == ATTR_NAME_TYPE_INT)
346
                    *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
347
                else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
348
                    *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
349
            }
350
        }
351
    }
352
}
353

    
354
/** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
355
 *  and end time.
356
 *  Used for seeking in the rtp stream.
357
 */
358
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
359
{
360
    char buf[256];
361

    
362
    skip_spaces(&p);
363
    if (!av_stristart(p, "npt=", &p))
364
        return;
365

    
366
    *start = AV_NOPTS_VALUE;
367
    *end = AV_NOPTS_VALUE;
368

    
369
    get_word_sep(buf, sizeof(buf), "-", &p);
370
    *start = parse_date(buf, 1);
371
    if (*p == '-') {
372
        p++;
373
        get_word_sep(buf, sizeof(buf), "-", &p);
374
        *end = parse_date(buf, 1);
375
    }
376
//    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
377
//    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
378
}
379

    
380
typedef struct SDPParseState {
381
    /* SDP only */
382
    struct in_addr default_ip;
383
    int default_ttl;
384
} SDPParseState;
385

    
386
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
387
                           int letter, const char *buf)
388
{
389
    RTSPState *rt = s->priv_data;
390
    char buf1[64], st_type[64];
391
    const char *p;
392
    enum CodecType codec_type;
393
    int payload_type, i;
394
    AVStream *st;
395
    RTSPStream *rtsp_st;
396
    struct in_addr sdp_ip;
397
    int ttl;
398

    
399
#ifdef DEBUG
400
    printf("sdp: %c='%s'\n", letter, buf);
401
#endif
402

    
403
    p = buf;
404
    switch(letter) {
405
    case 'c':
406
        get_word(buf1, sizeof(buf1), &p);
407
        if (strcmp(buf1, "IN") != 0)
408
            return;
409
        get_word(buf1, sizeof(buf1), &p);
410
        if (strcmp(buf1, "IP4") != 0)
411
            return;
412
        get_word_sep(buf1, sizeof(buf1), "/", &p);
413
        if (inet_aton(buf1, &sdp_ip) == 0)
414
            return;
415
        ttl = 16;
416
        if (*p == '/') {
417
            p++;
418
            get_word_sep(buf1, sizeof(buf1), "/", &p);
419
            ttl = atoi(buf1);
420
        }
421
        if (s->nb_streams == 0) {
422
            s1->default_ip = sdp_ip;
423
            s1->default_ttl = ttl;
424
        } else {
425
            st = s->streams[s->nb_streams - 1];
426
            rtsp_st = st->priv_data;
427
            rtsp_st->sdp_ip = sdp_ip;
428
            rtsp_st->sdp_ttl = ttl;
429
        }
430
        break;
431
    case 's':
432
        av_strlcpy(s->title, p, sizeof(s->title));
433
        break;
434
    case 'i':
435
        if (s->nb_streams == 0) {
436
            av_strlcpy(s->comment, p, sizeof(s->comment));
437
            break;
438
        }
439
        break;
440
    case 'm':
441
        /* new stream */
442
        get_word(st_type, sizeof(st_type), &p);
443
        if (!strcmp(st_type, "audio")) {
444
            codec_type = CODEC_TYPE_AUDIO;
445
        } else if (!strcmp(st_type, "video")) {
446
            codec_type = CODEC_TYPE_VIDEO;
447
        } else {
448
            return;
449
        }
450
        rtsp_st = av_mallocz(sizeof(RTSPStream));
451
        if (!rtsp_st)
452
            return;
453
        rtsp_st->stream_index = -1;
454
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
455

    
456
        rtsp_st->sdp_ip = s1->default_ip;
457
        rtsp_st->sdp_ttl = s1->default_ttl;
458

    
459
        get_word(buf1, sizeof(buf1), &p); /* port */
460
        rtsp_st->sdp_port = atoi(buf1);
461

    
462
        get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
463

    
464
        /* XXX: handle list of formats */
465
        get_word(buf1, sizeof(buf1), &p); /* format list */
466
        rtsp_st->sdp_payload_type = atoi(buf1);
467

    
468
        if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
469
            /* no corresponding stream */
470
        } else {
471
            st = av_new_stream(s, 0);
472
            if (!st)
473
                return;
474
            st->priv_data = rtsp_st;
475
            rtsp_st->stream_index = st->index;
476
            st->codec->codec_type = codec_type;
477
            if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
478
                /* if standard payload type, we can find the codec right now */
479
                rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
480
            }
481
        }
482
        /* put a default control url */
483
        av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
484
        break;
485
    case 'a':
486
        if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
487
            char proto[32];
488
            /* get the control url */
489
            st = s->streams[s->nb_streams - 1];
490
            rtsp_st = st->priv_data;
491

    
492
            /* XXX: may need to add full url resolution */
493
            url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
494
            if (proto[0] == '\0') {
495
                /* relative control URL */
496
                av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
497
                av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
498
            } else {
499
                av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
500
            }
501
        } else if (av_strstart(p, "rtpmap:", &p)) {
502
            /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
503
            get_word(buf1, sizeof(buf1), &p);
504
            payload_type = atoi(buf1);
505
            for(i = 0; i < s->nb_streams;i++) {
506
                st = s->streams[i];
507
                rtsp_st = st->priv_data;
508
                if (rtsp_st->sdp_payload_type == payload_type) {
509
                    sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
510
                }
511
            }
512
        } else if (av_strstart(p, "fmtp:", &p)) {
513
            /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
514
            get_word(buf1, sizeof(buf1), &p);
515
            payload_type = atoi(buf1);
516
            for(i = 0; i < s->nb_streams;i++) {
517
                st = s->streams[i];
518
                rtsp_st = st->priv_data;
519
                if (rtsp_st->sdp_payload_type == payload_type) {
520
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
521
                        if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
522
                            sdp_parse_fmtp(st, p);
523
                        }
524
                    } else {
525
                        sdp_parse_fmtp(st, p);
526
                    }
527
                }
528
            }
529
        } else if(av_strstart(p, "framesize:", &p)) {
530
            // let dynamic protocol handlers have a stab at the line.
531
            get_word(buf1, sizeof(buf1), &p);
532
            payload_type = atoi(buf1);
533
            for(i = 0; i < s->nb_streams;i++) {
534
                st = s->streams[i];
535
                rtsp_st = st->priv_data;
536
                if (rtsp_st->sdp_payload_type == payload_type) {
537
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
538
                        rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
539
                    }
540
                }
541
            }
542
        } else if(av_strstart(p, "range:", &p)) {
543
            int64_t start, end;
544

    
545
            // this is so that seeking on a streamed file can work.
546
            rtsp_parse_range_npt(p, &start, &end);
547
            s->start_time= start;
548
            s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
549
        } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
550
            if (atoi(p) == 1)
551
                rt->transport = RTSP_TRANSPORT_RDT;
552
        } else if (s->nb_streams > 0) {
553
            rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
554
            if (rtsp_st->dynamic_handler &&
555
                rtsp_st->dynamic_handler->parse_sdp_a_line)
556
                rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1],
557
                    rtsp_st->dynamic_protocol_context, buf);
558
        }
559
        break;
560
    }
561
}
562

    
563
static int sdp_parse(AVFormatContext *s, const char *content)
564
{
565
    const char *p;
566
    int letter;
567
    char buf[2048], *q;
568
    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
569

    
570
    memset(s1, 0, sizeof(SDPParseState));
571
    p = content;
572
    for(;;) {
573
        skip_spaces(&p);
574
        letter = *p;
575
        if (letter == '\0')
576
            break;
577
        p++;
578
        if (*p != '=')
579
            goto next_line;
580
        p++;
581
        /* get the content */
582
        q = buf;
583
        while (*p != '\n' && *p != '\r' && *p != '\0') {
584
            if ((q - buf) < sizeof(buf) - 1)
585
                *q++ = *p;
586
            p++;
587
        }
588
        *q = '\0';
589
        sdp_parse_line(s, s1, letter, buf);
590
    next_line:
591
        while (*p != '\n' && *p != '\0')
592
            p++;
593
        if (*p == '\n')
594
            p++;
595
    }
596
    return 0;
597
}
598

    
599
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
600
{
601
    const char *p;
602
    int v;
603

    
604
    p = *pp;
605
    skip_spaces(&p);
606
    v = strtol(p, (char **)&p, 10);
607
    if (*p == '-') {
608
        p++;
609
        *min_ptr = v;
610
        v = strtol(p, (char **)&p, 10);
611
        *max_ptr = v;
612
    } else {
613
        *min_ptr = v;
614
        *max_ptr = v;
615
    }
616
    *pp = p;
617
}
618

    
619
/* XXX: only one transport specification is parsed */
620
static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
621
{
622
    char transport_protocol[16];
623
    char profile[16];
624
    char lower_transport[16];
625
    char parameter[16];
626
    RTSPTransportField *th;
627
    char buf[256];
628

    
629
    reply->nb_transports = 0;
630

    
631
    for(;;) {
632
        skip_spaces(&p);
633
        if (*p == '\0')
634
            break;
635

    
636
        th = &reply->transports[reply->nb_transports];
637

    
638
        get_word_sep(transport_protocol, sizeof(transport_protocol),
639
                     "/", &p);
640
        if (*p == '/')
641
            p++;
642
        if (!strcasecmp (transport_protocol, "rtp")) {
643
            get_word_sep(profile, sizeof(profile), "/;,", &p);
644
            lower_transport[0] = '\0';
645
            /* rtp/avp/<protocol> */
646
            if (*p == '/') {
647
                p++;
648
                get_word_sep(lower_transport, sizeof(lower_transport),
649
                             ";,", &p);
650
            }
651
            th->transport = RTSP_TRANSPORT_RTP;
652
        } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
653
                   !strcasecmp (transport_protocol, "x-real-rdt")) {
654
            /* x-pn-tng/<protocol> */
655
            get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
656
            profile[0] = '\0';
657
            th->transport = RTSP_TRANSPORT_RDT;
658
        }
659
        if (!strcasecmp(lower_transport, "TCP"))
660
            th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
661
        else
662
            th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
663

    
664
        if (*p == ';')
665
            p++;
666
        /* get each parameter */
667
        while (*p != '\0' && *p != ',') {
668
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
669
            if (!strcmp(parameter, "port")) {
670
                if (*p == '=') {
671
                    p++;
672
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
673
                }
674
            } else if (!strcmp(parameter, "client_port")) {
675
                if (*p == '=') {
676
                    p++;
677
                    rtsp_parse_range(&th->client_port_min,
678
                                     &th->client_port_max, &p);
679
                }
680
            } else if (!strcmp(parameter, "server_port")) {
681
                if (*p == '=') {
682
                    p++;
683
                    rtsp_parse_range(&th->server_port_min,
684
                                     &th->server_port_max, &p);
685
                }
686
            } else if (!strcmp(parameter, "interleaved")) {
687
                if (*p == '=') {
688
                    p++;
689
                    rtsp_parse_range(&th->interleaved_min,
690
                                     &th->interleaved_max, &p);
691
                }
692
            } else if (!strcmp(parameter, "multicast")) {
693
                if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
694
                    th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
695
            } else if (!strcmp(parameter, "ttl")) {
696
                if (*p == '=') {
697
                    p++;
698
                    th->ttl = strtol(p, (char **)&p, 10);
699
                }
700
            } else if (!strcmp(parameter, "destination")) {
701
                struct in_addr ipaddr;
702

    
703
                if (*p == '=') {
704
                    p++;
705
                    get_word_sep(buf, sizeof(buf), ";,", &p);
706
                    if (inet_aton(buf, &ipaddr))
707
                        th->destination = ntohl(ipaddr.s_addr);
708
                }
709
            }
710
            while (*p != ';' && *p != '\0' && *p != ',')
711
                p++;
712
            if (*p == ';')
713
                p++;
714
        }
715
        if (*p == ',')
716
            p++;
717

    
718
        reply->nb_transports++;
719
    }
720
}
721

    
722
void rtsp_parse_line(RTSPHeader *reply, const char *buf)
723
{
724
    const char *p;
725

    
726
    /* NOTE: we do case independent match for broken servers */
727
    p = buf;
728
    if (av_stristart(p, "Session:", &p)) {
729
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
730
    } else if (av_stristart(p, "Content-Length:", &p)) {
731
        reply->content_length = strtol(p, NULL, 10);
732
    } else if (av_stristart(p, "Transport:", &p)) {
733
        rtsp_parse_transport(reply, p);
734
    } else if (av_stristart(p, "CSeq:", &p)) {
735
        reply->seq = strtol(p, NULL, 10);
736
    } else if (av_stristart(p, "Range:", &p)) {
737
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
738
    } else if (av_stristart(p, "RealChallenge1:", &p)) {
739
        skip_spaces(&p);
740
        av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
741
    }
742
}
743

    
744
static int url_readbuf(URLContext *h, unsigned char *buf, int size)
745
{
746
    int ret, len;
747

    
748
    len = 0;
749
    while (len < size) {
750
        ret = url_read(h, buf+len, size-len);
751
        if (ret < 1)
752
            return ret;
753
        len += ret;
754
    }
755
    return len;
756
}
757

    
758
/* skip a RTP/TCP interleaved packet */
759
static void rtsp_skip_packet(AVFormatContext *s)
760
{
761
    RTSPState *rt = s->priv_data;
762
    int ret, len, len1;
763
    uint8_t buf[1024];
764

    
765
    ret = url_readbuf(rt->rtsp_hd, buf, 3);
766
    if (ret != 3)
767
        return;
768
    len = AV_RB16(buf + 1);
769
#ifdef DEBUG
770
    printf("skipping RTP packet len=%d\n", len);
771
#endif
772
    /* skip payload */
773
    while (len > 0) {
774
        len1 = len;
775
        if (len1 > sizeof(buf))
776
            len1 = sizeof(buf);
777
        ret = url_readbuf(rt->rtsp_hd, buf, len1);
778
        if (ret != len1)
779
            return;
780
        len -= len1;
781
    }
782
}
783

    
784
static void rtsp_send_cmd(AVFormatContext *s,
785
                          const char *cmd, RTSPHeader *reply,
786
                          unsigned char **content_ptr)
787
{
788
    RTSPState *rt = s->priv_data;
789
    char buf[4096], buf1[1024], *q;
790
    unsigned char ch;
791
    const char *p;
792
    int content_length, line_count;
793
    unsigned char *content = NULL;
794

    
795
    memset(reply, 0, sizeof(RTSPHeader));
796

    
797
    rt->seq++;
798
    av_strlcpy(buf, cmd, sizeof(buf));
799
    snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
800
    av_strlcat(buf, buf1, sizeof(buf));
801
    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
802
        snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
803
        av_strlcat(buf, buf1, sizeof(buf));
804
    }
805
    av_strlcat(buf, "\r\n", sizeof(buf));
806
#ifdef DEBUG
807
    printf("Sending:\n%s--\n", buf);
808
#endif
809
    url_write(rt->rtsp_hd, buf, strlen(buf));
810

    
811
    /* parse reply (XXX: use buffers) */
812
    line_count = 0;
813
    rt->last_reply[0] = '\0';
814
    for(;;) {
815
        q = buf;
816
        for(;;) {
817
            if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
818
                break;
819
            if (ch == '\n')
820
                break;
821
            if (ch == '$') {
822
                /* XXX: only parse it if first char on line ? */
823
                rtsp_skip_packet(s);
824
            } else if (ch != '\r') {
825
                if ((q - buf) < sizeof(buf) - 1)
826
                    *q++ = ch;
827
            }
828
        }
829
        *q = '\0';
830
#ifdef DEBUG
831
        printf("line='%s'\n", buf);
832
#endif
833
        /* test if last line */
834
        if (buf[0] == '\0')
835
            break;
836
        p = buf;
837
        if (line_count == 0) {
838
            /* get reply code */
839
            get_word(buf1, sizeof(buf1), &p);
840
            get_word(buf1, sizeof(buf1), &p);
841
            reply->status_code = atoi(buf1);
842
        } else {
843
            rtsp_parse_line(reply, p);
844
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
845
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
846
        }
847
        line_count++;
848
    }
849

    
850
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
851
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
852

    
853
    content_length = reply->content_length;
854
    if (content_length > 0) {
855
        /* leave some room for a trailing '\0' (useful for simple parsing) */
856
        content = av_malloc(content_length + 1);
857
        (void)url_readbuf(rt->rtsp_hd, content, content_length);
858
        content[content_length] = '\0';
859
    }
860
    if (content_ptr)
861
        *content_ptr = content;
862
    else
863
        av_free(content);
864
}
865

    
866

    
867
/* close and free RTSP streams */
868
static void rtsp_close_streams(RTSPState *rt)
869
{
870
    int i;
871
    RTSPStream *rtsp_st;
872

    
873
    for(i=0;i<rt->nb_rtsp_streams;i++) {
874
        rtsp_st = rt->rtsp_streams[i];
875
        if (rtsp_st) {
876
            if (rtsp_st->tx_ctx) {
877
                if (rt->transport == RTSP_TRANSPORT_RDT)
878
                    ff_rdt_parse_close(rtsp_st->tx_ctx);
879
                else
880
                rtp_parse_close(rtsp_st->tx_ctx);
881
            }
882
            if (rtsp_st->rtp_handle)
883
                url_close(rtsp_st->rtp_handle);
884
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
885
                rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
886
        }
887
    }
888
    av_free(rt->rtsp_streams);
889
}
890

    
891
static int
892
rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
893
{
894
    RTSPState *rt = s->priv_data;
895
    AVStream *st = NULL;
896

    
897
    /* open the RTP context */
898
    if (rtsp_st->stream_index >= 0)
899
        st = s->streams[rtsp_st->stream_index];
900
    if (!st)
901
        s->ctx_flags |= AVFMTCTX_NOHEADER;
902

    
903
    if (rt->transport == RTSP_TRANSPORT_RDT)
904
        rtsp_st->tx_ctx = ff_rdt_parse_open(s, st,
905
                                            rtsp_st->dynamic_protocol_context,
906
                                            rtsp_st->dynamic_handler);
907
    else
908
    rtsp_st->tx_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
909

    
910
    if (!rtsp_st->tx_ctx) {
911
         return AVERROR(ENOMEM);
912
    } else if (rt->transport != RTSP_TRANSPORT_RDT) {
913
        if(rtsp_st->dynamic_handler) {
914
            rtp_parse_set_dynamic_protocol(rtsp_st->tx_ctx,
915
                                           rtsp_st->dynamic_protocol_context,
916
                                           rtsp_st->dynamic_handler);
917
        }
918
    }
919

    
920
    return 0;
921
}
922

    
923
/**
924
 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
925
 */
926
static int
927
make_setup_request (AVFormatContext *s, const char *host, int port,
928
                    int lower_transport, const char *real_challenge)
929
{
930
    RTSPState *rt = s->priv_data;
931
    int j, i, err;
932
    RTSPStream *rtsp_st;
933
    RTSPHeader reply1, *reply = &reply1;
934
    char cmd[2048];
935
    const char *trans_pref;
936

    
937
    if (rt->transport == RTSP_TRANSPORT_RDT)
938
        trans_pref = "x-pn-tng";
939
    else
940
        trans_pref = "RTP/AVP";
941

    
942
    /* for each stream, make the setup request */
943
    /* XXX: we assume the same server is used for the control of each
944
       RTSP stream */
945

    
946
    for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
947
        char transport[2048];
948

    
949
        rtsp_st = rt->rtsp_streams[i];
950

    
951
        /* RTP/UDP */
952
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
953
            char buf[256];
954

    
955
            /* first try in specified port range */
956
            if (RTSP_RTP_PORT_MIN != 0) {
957
                while(j <= RTSP_RTP_PORT_MAX) {
958
                    snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
959
                    j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
960
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
961
                        goto rtp_opened;
962
                    }
963
                }
964
            }
965

    
966
/*            then try on any port
967
**            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
968
**                err = AVERROR_INVALIDDATA;
969
**                goto fail;
970
**            }
971
*/
972

    
973
        rtp_opened:
974
            port = rtp_get_local_port(rtsp_st->rtp_handle);
975
            snprintf(transport, sizeof(transport) - 1,
976
                     "%s/UDP;", trans_pref);
977
            if (rt->server_type != RTSP_SERVER_REAL)
978
                av_strlcat(transport, "unicast;", sizeof(transport));
979
            av_strlcatf(transport, sizeof(transport),
980
                     "client_port=%d", port);
981
            if (rt->transport == RTSP_TRANSPORT_RTP)
982
                av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
983
        }
984

    
985
        /* RTP/TCP */
986
        else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
987
            snprintf(transport, sizeof(transport) - 1,
988
                     "%s/TCP", trans_pref);
989
        }
990

    
991
        else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
992
            snprintf(transport, sizeof(transport) - 1,
993
                     "%s/UDP;multicast", trans_pref);
994
        }
995
        if (rt->server_type == RTSP_SERVER_REAL)
996
            av_strlcat(transport, ";mode=play", sizeof(transport));
997
        snprintf(cmd, sizeof(cmd),
998
                 "SETUP %s RTSP/1.0\r\n"
999
                 "Transport: %s\r\n",
1000
                 rtsp_st->control_url, transport);
1001
        if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1002
            char real_res[41], real_csum[9];
1003
            ff_rdt_calc_response_and_checksum(real_res, real_csum,
1004
                                              real_challenge);
1005
            av_strlcatf(cmd, sizeof(cmd),
1006
                        "If-Match: %s\r\n"
1007
                        "RealChallenge2: %s, sd=%s\r\n",
1008
                        rt->session_id, real_res, real_csum);
1009
        }
1010
        rtsp_send_cmd(s, cmd, reply, NULL);
1011
        if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1012
            err = 1;
1013
            goto fail;
1014
        } else if (reply->status_code != RTSP_STATUS_OK ||
1015
                   reply->nb_transports != 1) {
1016
            err = AVERROR_INVALIDDATA;
1017
            goto fail;
1018
        }
1019

    
1020
        /* XXX: same protocol for all streams is required */
1021
        if (i > 0) {
1022
            if (reply->transports[0].lower_transport != rt->lower_transport ||
1023
                reply->transports[0].transport != rt->transport) {
1024
                err = AVERROR_INVALIDDATA;
1025
                goto fail;
1026
            }
1027
        } else {
1028
            rt->lower_transport = reply->transports[0].lower_transport;
1029
            rt->transport = reply->transports[0].transport;
1030
        }
1031

    
1032
        /* close RTP connection if not choosen */
1033
        if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1034
            (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1035
            url_close(rtsp_st->rtp_handle);
1036
            rtsp_st->rtp_handle = NULL;
1037
        }
1038

    
1039
        switch(reply->transports[0].lower_transport) {
1040
        case RTSP_LOWER_TRANSPORT_TCP:
1041
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1042
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1043
            break;
1044

    
1045
        case RTSP_LOWER_TRANSPORT_UDP:
1046
            {
1047
                char url[1024];
1048

    
1049
                /* XXX: also use address if specified */
1050
                snprintf(url, sizeof(url), "rtp://%s:%d",
1051
                         host, reply->transports[0].server_port_min);
1052
                if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1053
                    err = AVERROR_INVALIDDATA;
1054
                    goto fail;
1055
                }
1056
            }
1057
            break;
1058
        case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1059
            {
1060
                char url[1024];
1061
                struct in_addr in;
1062

    
1063
                in.s_addr = htonl(reply->transports[0].destination);
1064
                snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1065
                         inet_ntoa(in),
1066
                         reply->transports[0].port_min,
1067
                         reply->transports[0].ttl);
1068
                if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1069
                    err = AVERROR_INVALIDDATA;
1070
                    goto fail;
1071
                }
1072
            }
1073
            break;
1074
        }
1075

    
1076
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1077
            goto fail;
1078
    }
1079

    
1080
    if (rt->server_type == RTSP_SERVER_REAL)
1081
        rt->need_subscription = 1;
1082

    
1083
    return 0;
1084

    
1085
fail:
1086
    for (i=0; i<rt->nb_rtsp_streams; i++) {
1087
        if (rt->rtsp_streams[i]->rtp_handle) {
1088
            url_close(rt->rtsp_streams[i]->rtp_handle);
1089
            rt->rtsp_streams[i]->rtp_handle = NULL;
1090
        }
1091
    }
1092
    return err;
1093
}
1094

    
1095
static int rtsp_read_header(AVFormatContext *s,
1096
                            AVFormatParameters *ap)
1097
{
1098
    RTSPState *rt = s->priv_data;
1099
    char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1100
    URLContext *rtsp_hd;
1101
    int port, ret, err;
1102
    RTSPHeader reply1, *reply = &reply1;
1103
    unsigned char *content = NULL;
1104
    int lower_transport_mask = 0;
1105
    char real_challenge[64];
1106

    
1107
    /* extract hostname and port */
1108
    url_split(NULL, 0, NULL, 0,
1109
              host, sizeof(host), &port, path, sizeof(path), s->filename);
1110
    if (port < 0)
1111
        port = RTSP_DEFAULT_PORT;
1112

    
1113
    /* search for options */
1114
    option_list = strchr(path, '?');
1115
    if (option_list) {
1116
        /* remove the options from the path */
1117
        *option_list++ = 0;
1118
        while(option_list) {
1119
            /* move the option pointer */
1120
            option = option_list;
1121
            option_list = strchr(option_list, '&');
1122
            if (option_list)
1123
                *(option_list++) = 0;
1124
            /* handle the options */
1125
            if (strcmp(option, "udp") == 0)
1126
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1127
            else if (strcmp(option, "multicast") == 0)
1128
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1129
            else if (strcmp(option, "tcp") == 0)
1130
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1131
        }
1132
    }
1133

    
1134
    if (!lower_transport_mask)
1135
        lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_LAST) - 1;
1136

    
1137
    /* open the tcp connexion */
1138
    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1139
    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1140
        return AVERROR(EIO);
1141
    rt->rtsp_hd = rtsp_hd;
1142
    rt->seq = 0;
1143

    
1144
    /* request options supported by the server; this also detects server type */
1145
    for (rt->server_type = RTSP_SERVER_RTP;;) {
1146
        snprintf(cmd, sizeof(cmd),
1147
                 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1148
        if (rt->server_type == RTSP_SERVER_REAL)
1149
            av_strlcat(cmd,
1150
                       /**
1151
                        * The following entries are required for proper
1152
                        * streaming from a Realmedia server. They are
1153
                        * interdependent in some way although we currently
1154
                        * don't quite understand how. Values were copied
1155
                        * from mplayer SVN r23589.
1156
                        * @param CompanyID is a 16-byte ID in base64
1157
                        * @param ClientChallenge is a 16-byte ID in hex
1158
                        */
1159
                       "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1160
                       "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1161
                       "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1162
                       "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1163
                       sizeof(cmd));
1164
        rtsp_send_cmd(s, cmd, reply, NULL);
1165
        if (reply->status_code != RTSP_STATUS_OK) {
1166
            err = AVERROR_INVALIDDATA;
1167
            goto fail;
1168
        }
1169

    
1170
        /* detect server type if not standard-compliant RTP */
1171
        if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1172
            rt->server_type = RTSP_SERVER_REAL;
1173
            continue;
1174
        } else if (rt->server_type == RTSP_SERVER_REAL) {
1175
            strcpy(real_challenge, reply->real_challenge);
1176
        }
1177
        break;
1178
    }
1179

    
1180
    /* describe the stream */
1181
    snprintf(cmd, sizeof(cmd),
1182
             "DESCRIBE %s RTSP/1.0\r\n"
1183
             "Accept: application/sdp\r\n",
1184
             s->filename);
1185
    if (rt->server_type == RTSP_SERVER_REAL) {
1186
        /**
1187
         * The Require: attribute is needed for proper streaming from
1188
         * Realmedia servers.
1189
         */
1190
        av_strlcat(cmd,
1191
                   "Require: com.real.retain-entity-for-setup\r\n",
1192
                   sizeof(cmd));
1193
    }
1194
    rtsp_send_cmd(s, cmd, reply, &content);
1195
    if (!content) {
1196
        err = AVERROR_INVALIDDATA;
1197
        goto fail;
1198
    }
1199
    if (reply->status_code != RTSP_STATUS_OK) {
1200
        err = AVERROR_INVALIDDATA;
1201
        goto fail;
1202
    }
1203

    
1204
    /* now we got the SDP description, we parse it */
1205
    ret = sdp_parse(s, (const char *)content);
1206
    av_freep(&content);
1207
    if (ret < 0) {
1208
        err = AVERROR_INVALIDDATA;
1209
        goto fail;
1210
    }
1211

    
1212
    do {
1213
        int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1214

    
1215
        err = make_setup_request(s, host, port, lower_transport,
1216
                                 rt->server_type == RTSP_SERVER_REAL ?
1217
                                     real_challenge : NULL);
1218
        if (err < 0)
1219
            goto fail;
1220
        lower_transport_mask &= ~(1 << lower_transport);
1221
        if (lower_transport_mask == 0 && err == 1) {
1222
            err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1223
            goto fail;
1224
        }
1225
    } while (err);
1226

    
1227
    rt->state = RTSP_STATE_IDLE;
1228
    rt->seek_timestamp = 0; /* default is to start stream at position
1229
                               zero */
1230
    if (ap->initial_pause) {
1231
        /* do not start immediately */
1232
    } else {
1233
        if (rtsp_read_play(s) < 0) {
1234
            err = AVERROR_INVALIDDATA;
1235
            goto fail;
1236
        }
1237
    }
1238
    return 0;
1239
 fail:
1240
    rtsp_close_streams(rt);
1241
    av_freep(&content);
1242
    url_close(rt->rtsp_hd);
1243
    return err;
1244
}
1245

    
1246
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1247
                           uint8_t *buf, int buf_size)
1248
{
1249
    RTSPState *rt = s->priv_data;
1250
    int id, len, i, ret;
1251
    RTSPStream *rtsp_st;
1252

    
1253
#ifdef DEBUG_RTP_TCP
1254
    printf("tcp_read_packet:\n");
1255
#endif
1256
 redo:
1257
    for(;;) {
1258
        ret = url_readbuf(rt->rtsp_hd, buf, 1);
1259
#ifdef DEBUG_RTP_TCP
1260
        printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1261
#endif
1262
        if (ret != 1)
1263
            return -1;
1264
        if (buf[0] == '$')
1265
            break;
1266
    }
1267
    ret = url_readbuf(rt->rtsp_hd, buf, 3);
1268
    if (ret != 3)
1269
        return -1;
1270
    id = buf[0];
1271
    len = AV_RB16(buf + 1);
1272
#ifdef DEBUG_RTP_TCP
1273
    printf("id=%d len=%d\n", id, len);
1274
#endif
1275
    if (len > buf_size || len < 12)
1276
        goto redo;
1277
    /* get the data */
1278
    ret = url_readbuf(rt->rtsp_hd, buf, len);
1279
    if (ret != len)
1280
        return -1;
1281
    if (rt->transport == RTSP_TRANSPORT_RDT &&
1282
        ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL) < 0)
1283
        return -1;
1284

    
1285
    /* find the matching stream */
1286
    for(i = 0; i < rt->nb_rtsp_streams; i++) {
1287
        rtsp_st = rt->rtsp_streams[i];
1288
        if (id >= rtsp_st->interleaved_min &&
1289
            id <= rtsp_st->interleaved_max)
1290
            goto found;
1291
    }
1292
    goto redo;
1293
 found:
1294
    *prtsp_st = rtsp_st;
1295
    return len;
1296
}
1297

    
1298
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1299
                           uint8_t *buf, int buf_size)
1300
{
1301
    RTSPState *rt = s->priv_data;
1302
    RTSPStream *rtsp_st;
1303
    fd_set rfds;
1304
    int fd1, fd2, fd_max, n, i, ret;
1305
    struct timeval tv;
1306

    
1307
    for(;;) {
1308
        if (url_interrupt_cb())
1309
            return AVERROR(EINTR);
1310
        FD_ZERO(&rfds);
1311
        fd_max = -1;
1312
        for(i = 0; i < rt->nb_rtsp_streams; i++) {
1313
            rtsp_st = rt->rtsp_streams[i];
1314
            /* currently, we cannot probe RTCP handle because of blocking restrictions */
1315
            rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1316
            if (fd1 > fd_max)
1317
                fd_max = fd1;
1318
            FD_SET(fd1, &rfds);
1319
        }
1320
        tv.tv_sec = 0;
1321
        tv.tv_usec = 100 * 1000;
1322
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1323
        if (n > 0) {
1324
            for(i = 0; i < rt->nb_rtsp_streams; i++) {
1325
                rtsp_st = rt->rtsp_streams[i];
1326
                rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1327
                if (FD_ISSET(fd1, &rfds)) {
1328
                    ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1329
                    if (ret > 0) {
1330
                        *prtsp_st = rtsp_st;
1331
                        return ret;
1332
                    }
1333
                }
1334
            }
1335
        }
1336
    }
1337
}
1338

    
1339
static int rtsp_read_packet(AVFormatContext *s,
1340
                            AVPacket *pkt)
1341
{
1342
    RTSPState *rt = s->priv_data;
1343
    RTSPStream *rtsp_st;
1344
    int ret, len;
1345
    uint8_t buf[RTP_MAX_PACKET_LENGTH];
1346

    
1347
    if (rt->server_type == RTSP_SERVER_REAL && rt->need_subscription) {
1348
        int i;
1349
        RTSPHeader reply1, *reply = &reply1;
1350
        char cmd[1024];
1351

    
1352
        snprintf(cmd, sizeof(cmd),
1353
                 "SET_PARAMETER %s RTSP/1.0\r\n"
1354
                 "Subscribe: ",
1355
                 s->filename);
1356
        for (i = 0; i < rt->nb_rtsp_streams; i++) {
1357
            if (i != 0) av_strlcat(cmd, ",", sizeof(cmd));
1358
            ff_rdt_subscribe_rule(cmd, sizeof(cmd), i, 0);
1359
            if (rt->transport == RTSP_TRANSPORT_RDT)
1360
                ff_rdt_subscribe_rule2(
1361
                    rt->rtsp_streams[i]->tx_ctx,
1362
                    cmd, sizeof(cmd), i, 0);
1363
        }
1364
        av_strlcat(cmd, "\r\n", sizeof(cmd));
1365
        rtsp_send_cmd(s, cmd, reply, NULL);
1366
        if (reply->status_code != RTSP_STATUS_OK)
1367
            return AVERROR_INVALIDDATA;
1368
        rt->need_subscription = 0;
1369

    
1370
        if (rt->state == RTSP_STATE_PLAYING)
1371
            rtsp_read_play (s);
1372
    }
1373

    
1374
    /* get next frames from the same RTP packet */
1375
    if (rt->cur_tx) {
1376
        if (rt->transport == RTSP_TRANSPORT_RDT)
1377
            ret = ff_rdt_parse_packet(rt->cur_tx, pkt, NULL, 0);
1378
        else
1379
            ret = rtp_parse_packet(rt->cur_tx, pkt, NULL, 0);
1380
        if (ret == 0) {
1381
            rt->cur_tx = NULL;
1382
            return 0;
1383
        } else if (ret == 1) {
1384
            return 0;
1385
        } else {
1386
            rt->cur_tx = NULL;
1387
        }
1388
    }
1389

    
1390
    /* read next RTP packet */
1391
 redo:
1392
    switch(rt->lower_transport) {
1393
    default:
1394
    case RTSP_LOWER_TRANSPORT_TCP:
1395
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1396
        break;
1397
    case RTSP_LOWER_TRANSPORT_UDP:
1398
    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1399
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1400
        if (len >=0 && rtsp_st->tx_ctx)
1401
            rtp_check_and_send_back_rr(rtsp_st->tx_ctx, len);
1402
        break;
1403
    }
1404
    if (len < 0)
1405
        return len;
1406
    if (rt->transport == RTSP_TRANSPORT_RDT)
1407
        ret = ff_rdt_parse_packet(rtsp_st->tx_ctx, pkt, buf, len);
1408
    else
1409
        ret = rtp_parse_packet(rtsp_st->tx_ctx, pkt, buf, len);
1410
    if (ret < 0)
1411
        goto redo;
1412
    if (ret == 1) {
1413
        /* more packets may follow, so we save the RTP context */
1414
        rt->cur_tx = rtsp_st->tx_ctx;
1415
    }
1416
    return 0;
1417
}
1418

    
1419
static int rtsp_read_play(AVFormatContext *s)
1420
{
1421
    RTSPState *rt = s->priv_data;
1422
    RTSPHeader reply1, *reply = &reply1;
1423
    char cmd[1024];
1424

    
1425
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1426

    
1427
    if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1428
        if (rt->state == RTSP_STATE_PAUSED) {
1429
            snprintf(cmd, sizeof(cmd),
1430
                     "PLAY %s RTSP/1.0\r\n",
1431
                     s->filename);
1432
        } else {
1433
            snprintf(cmd, sizeof(cmd),
1434
                     "PLAY %s RTSP/1.0\r\n"
1435
                     "Range: npt=%0.3f-\r\n",
1436
                     s->filename,
1437
                     (double)rt->seek_timestamp / AV_TIME_BASE);
1438
        }
1439
        rtsp_send_cmd(s, cmd, reply, NULL);
1440
        if (reply->status_code != RTSP_STATUS_OK) {
1441
            return -1;
1442
        }
1443
    }
1444
    rt->state = RTSP_STATE_PLAYING;
1445
    return 0;
1446
}
1447

    
1448
/* pause the stream */
1449
static int rtsp_read_pause(AVFormatContext *s)
1450
{
1451
    RTSPState *rt = s->priv_data;
1452
    RTSPHeader reply1, *reply = &reply1;
1453
    char cmd[1024];
1454

    
1455
    rt = s->priv_data;
1456

    
1457
    if (rt->state != RTSP_STATE_PLAYING)
1458
        return 0;
1459
    else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1460
        snprintf(cmd, sizeof(cmd),
1461
                 "PAUSE %s RTSP/1.0\r\n",
1462
                 s->filename);
1463
        rtsp_send_cmd(s, cmd, reply, NULL);
1464
        if (reply->status_code != RTSP_STATUS_OK) {
1465
            return -1;
1466
        }
1467
    }
1468
    rt->state = RTSP_STATE_PAUSED;
1469
    return 0;
1470
}
1471

    
1472
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1473
                          int64_t timestamp, int flags)
1474
{
1475
    RTSPState *rt = s->priv_data;
1476

    
1477
    rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1478
    switch(rt->state) {
1479
    default:
1480
    case RTSP_STATE_IDLE:
1481
        break;
1482
    case RTSP_STATE_PLAYING:
1483
        if (rtsp_read_play(s) != 0)
1484
            return -1;
1485
        break;
1486
    case RTSP_STATE_PAUSED:
1487
        rt->state = RTSP_STATE_IDLE;
1488
        break;
1489
    }
1490
    return 0;
1491
}
1492

    
1493
static int rtsp_read_close(AVFormatContext *s)
1494
{
1495
    RTSPState *rt = s->priv_data;
1496
    RTSPHeader reply1, *reply = &reply1;
1497
    char cmd[1024];
1498

    
1499
#if 0
1500
    /* NOTE: it is valid to flush the buffer here */
1501
    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1502
        url_fclose(&rt->rtsp_gb);
1503
    }
1504
#endif
1505
    snprintf(cmd, sizeof(cmd),
1506
             "TEARDOWN %s RTSP/1.0\r\n",
1507
             s->filename);
1508
    rtsp_send_cmd(s, cmd, reply, NULL);
1509

    
1510
    rtsp_close_streams(rt);
1511
    url_close(rt->rtsp_hd);
1512
    return 0;
1513
}
1514

    
1515
#ifdef CONFIG_RTSP_DEMUXER
1516
AVInputFormat rtsp_demuxer = {
1517
    "rtsp",
1518
    NULL_IF_CONFIG_SMALL("RTSP input format"),
1519
    sizeof(RTSPState),
1520
    rtsp_probe,
1521
    rtsp_read_header,
1522
    rtsp_read_packet,
1523
    rtsp_read_close,
1524
    rtsp_read_seek,
1525
    .flags = AVFMT_NOFILE,
1526
    .read_play = rtsp_read_play,
1527
    .read_pause = rtsp_read_pause,
1528
};
1529
#endif
1530

    
1531
static int sdp_probe(AVProbeData *p1)
1532
{
1533
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1534

    
1535
    /* we look for a line beginning "c=IN IP4" */
1536
    while (p < p_end && *p != '\0') {
1537
        if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1538
            return AVPROBE_SCORE_MAX / 2;
1539

    
1540
        while(p < p_end - 1 && *p != '\n') p++;
1541
        if (++p >= p_end)
1542
            break;
1543
        if (*p == '\r')
1544
            p++;
1545
    }
1546
    return 0;
1547
}
1548

    
1549
#define SDP_MAX_SIZE 8192
1550

    
1551
static int sdp_read_header(AVFormatContext *s,
1552
                           AVFormatParameters *ap)
1553
{
1554
    RTSPState *rt = s->priv_data;
1555
    RTSPStream *rtsp_st;
1556
    int size, i, err;
1557
    char *content;
1558
    char url[1024];
1559

    
1560
    /* read the whole sdp file */
1561
    /* XXX: better loading */
1562
    content = av_malloc(SDP_MAX_SIZE);
1563
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1564
    if (size <= 0) {
1565
        av_free(content);
1566
        return AVERROR_INVALIDDATA;
1567
    }
1568
    content[size] ='\0';
1569

    
1570
    sdp_parse(s, content);
1571
    av_free(content);
1572

    
1573
    /* open each RTP stream */
1574
    for(i=0;i<rt->nb_rtsp_streams;i++) {
1575
        rtsp_st = rt->rtsp_streams[i];
1576

    
1577
        snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1578
                 inet_ntoa(rtsp_st->sdp_ip),
1579
                 rtsp_st->sdp_port,
1580
                 rtsp_st->sdp_port,
1581
                 rtsp_st->sdp_ttl);
1582
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1583
            err = AVERROR_INVALIDDATA;
1584
            goto fail;
1585
        }
1586
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1587
            goto fail;
1588
    }
1589
    return 0;
1590
 fail:
1591
    rtsp_close_streams(rt);
1592
    return err;
1593
}
1594

    
1595
static int sdp_read_packet(AVFormatContext *s,
1596
                            AVPacket *pkt)
1597
{
1598
    return rtsp_read_packet(s, pkt);
1599
}
1600

    
1601
static int sdp_read_close(AVFormatContext *s)
1602
{
1603
    RTSPState *rt = s->priv_data;
1604
    rtsp_close_streams(rt);
1605
    return 0;
1606
}
1607

    
1608
#ifdef CONFIG_SDP_DEMUXER
1609
AVInputFormat sdp_demuxer = {
1610
    "sdp",
1611
    NULL_IF_CONFIG_SMALL("SDP"),
1612
    sizeof(RTSPState),
1613
    sdp_probe,
1614
    sdp_read_header,
1615
    sdp_read_packet,
1616
    sdp_read_close,
1617
};
1618
#endif
1619

    
1620
#ifdef CONFIG_REDIR_DEMUXER
1621
/* dummy redirector format (used directly in av_open_input_file now) */
1622
static int redir_probe(AVProbeData *pd)
1623
{
1624
    const char *p;
1625
    p = pd->buf;
1626
    while (redir_isspace(*p))
1627
        p++;
1628
    if (av_strstart(p, "http://", NULL) ||
1629
        av_strstart(p, "rtsp://", NULL))
1630
        return AVPROBE_SCORE_MAX;
1631
    return 0;
1632
}
1633

    
1634
static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1635
{
1636
    char buf[4096], *q;
1637
    int c;
1638
    AVFormatContext *ic = NULL;
1639
    ByteIOContext *f = s->pb;
1640

    
1641
    /* parse each URL and try to open it */
1642
    c = url_fgetc(f);
1643
    while (c != URL_EOF) {
1644
        /* skip spaces */
1645
        for(;;) {
1646
            if (!redir_isspace(c))
1647
                break;
1648
            c = url_fgetc(f);
1649
        }
1650
        if (c == URL_EOF)
1651
            break;
1652
        /* record url */
1653
        q = buf;
1654
        for(;;) {
1655
            if (c == URL_EOF || redir_isspace(c))
1656
                break;
1657
            if ((q - buf) < sizeof(buf) - 1)
1658
                *q++ = c;
1659
            c = url_fgetc(f);
1660
        }
1661
        *q = '\0';
1662
        //printf("URL='%s'\n", buf);
1663
        /* try to open the media file */
1664
        if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1665
            break;
1666
    }
1667
    if (!ic)
1668
        return AVERROR(EIO);
1669

    
1670
    *s = *ic;
1671
    url_fclose(f);
1672

    
1673
    return 0;
1674
}
1675

    
1676
AVInputFormat redir_demuxer = {
1677
    "redir",
1678
    NULL_IF_CONFIG_SMALL("Redirector format"),
1679
    0,
1680
    redir_probe,
1681
    redir_read_header,
1682
    NULL,
1683
    NULL,
1684
};
1685
#endif