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ffmpeg / libavformat / rtsp.c @ 67c9cd69

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1
/*
2
 * RTSP/SDP client
3
 * Copyright (c) 2002 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/* needed by inet_aton() */
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#define _SVID_SOURCE
24

    
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#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
28

    
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#include <sys/time.h>
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#if HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#include <strings.h>
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#include "network.h"
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#include "rtsp.h"
36

    
37
#include "rtpdec.h"
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#include "rdt.h"
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#include "rtp_asf.h"
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#include "rtp_vorbis.h"
41

    
42
//#define DEBUG
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//#define DEBUG_RTP_TCP
44

    
45
static int rtsp_read_play(AVFormatContext *s);
46

    
47
#if LIBAVFORMAT_VERSION_INT < (53 << 16)
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int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
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#endif
50

    
51
static int rtsp_probe(AVProbeData *p)
52
{
53
    if (av_strstart(p->filename, "rtsp:", NULL))
54
        return AVPROBE_SCORE_MAX;
55
    return 0;
56
}
57

    
58
#define SPACE_CHARS " \t\r\n"
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/* we use memchr() instead of strchr() here because strchr() will return
60
 * the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
61
#define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
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static void skip_spaces(const char **pp)
63
{
64
    const char *p;
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    p = *pp;
66
    while (redir_isspace(*p))
67
        p++;
68
    *pp = p;
69
}
70

    
71
static void get_word_until_chars(char *buf, int buf_size,
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                                 const char *sep, const char **pp)
73
{
74
    const char *p;
75
    char *q;
76

    
77
    p = *pp;
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    skip_spaces(&p);
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    q = buf;
80
    while (!strchr(sep, *p) && *p != '\0') {
81
        if ((q - buf) < buf_size - 1)
82
            *q++ = *p;
83
        p++;
84
    }
85
    if (buf_size > 0)
86
        *q = '\0';
87
    *pp = p;
88
}
89

    
90
static void get_word_sep(char *buf, int buf_size, const char *sep,
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                         const char **pp)
92
{
93
    if (**pp == '/') (*pp)++;
94
    get_word_until_chars(buf, buf_size, sep, pp);
95
}
96

    
97
static void get_word(char *buf, int buf_size, const char **pp)
98
{
99
    get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
100
}
101

    
102
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
103
   params>] */
104
static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
105
{
106
    char buf[256];
107
    int i;
108
    AVCodec *c;
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    const char *c_name;
110

    
111
    /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
112
       see if we can handle this kind of payload */
113
    get_word_sep(buf, sizeof(buf), "/", &p);
114
    if (payload_type >= RTP_PT_PRIVATE) {
115
        RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
116
        while(handler) {
117
            if (!strcasecmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
118
                codec->codec_id = handler->codec_id;
119
                rtsp_st->dynamic_handler= handler;
120
                if(handler->open) {
121
                    rtsp_st->dynamic_protocol_context= handler->open();
122
                }
123
                break;
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            }
125
            handler= handler->next;
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        }
127
    } else {
128
        /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
129
        /* search into AVRtpPayloadTypes[] */
130
        codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
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    }
132

    
133
    c = avcodec_find_decoder(codec->codec_id);
134
    if (c && c->name)
135
        c_name = c->name;
136
    else
137
        c_name = (char *)NULL;
138

    
139
    if (c_name) {
140
        get_word_sep(buf, sizeof(buf), "/", &p);
141
        i = atoi(buf);
142
        switch (codec->codec_type) {
143
            case CODEC_TYPE_AUDIO:
144
                av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
145
                codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
146
                codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
147
                if (i > 0) {
148
                    codec->sample_rate = i;
149
                    get_word_sep(buf, sizeof(buf), "/", &p);
150
                    i = atoi(buf);
151
                    if (i > 0)
152
                        codec->channels = i;
153
                    // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
154
                    //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
155
                }
156
                av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
157
                av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
158
                break;
159
            case CODEC_TYPE_VIDEO:
160
                av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
161
                break;
162
            default:
163
                break;
164
        }
165
        return 0;
166
    }
167

    
168
    return -1;
169
}
170

    
171
/* return the length and optionnaly the data */
172
static int hex_to_data(uint8_t *data, const char *p)
173
{
174
    int c, len, v;
175

    
176
    len = 0;
177
    v = 1;
178
    for(;;) {
179
        skip_spaces(&p);
180
        if (*p == '\0')
181
            break;
182
        c = toupper((unsigned char)*p++);
183
        if (c >= '0' && c <= '9')
184
            c = c - '0';
185
        else if (c >= 'A' && c <= 'F')
186
            c = c - 'A' + 10;
187
        else
188
            break;
189
        v = (v << 4) | c;
190
        if (v & 0x100) {
191
            if (data)
192
                data[len] = v;
193
            len++;
194
            v = 1;
195
        }
196
    }
197
    return len;
198
}
199

    
200
static void sdp_parse_fmtp_config(AVCodecContext * codec, void *ctx,
201
                                  char *attr, char *value)
202
{
203
    switch (codec->codec_id) {
204
        case CODEC_ID_MPEG4:
205
        case CODEC_ID_AAC:
206
            if (!strcmp(attr, "config")) {
207
                /* decode the hexa encoded parameter */
208
                int len = hex_to_data(NULL, value);
209
                if (codec->extradata)
210
                    av_free(codec->extradata);
211
                codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
212
                if (!codec->extradata)
213
                    return;
214
                codec->extradata_size = len;
215
                hex_to_data(codec->extradata, value);
216
            }
217
            break;
218
        case CODEC_ID_VORBIS:
219
            ff_vorbis_parse_fmtp_config(codec, ctx, attr, value);
220
            break;
221
        default:
222
            break;
223
    }
224
    return;
225
}
226

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

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

    
247
/** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
248
* because it is used in rtp_h264.c, which is forthcoming.
249
*/
250
int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
251
{
252
    skip_spaces(p);
253
    if(**p) {
254
        get_word_sep(attr, attr_size, "=", p);
255
        if (**p == '=')
256
            (*p)++;
257
        get_word_sep(value, value_size, ";", p);
258
        if (**p == ';')
259
            (*p)++;
260
        return 1;
261
    }
262
    return 0;
263
}
264

    
265
/* parse a SDP line and save stream attributes */
266
static void sdp_parse_fmtp(AVStream *st, const char *p)
267
{
268
    char attr[256];
269
    /* Vorbis setup headers can be up to 12KB and are sent base64
270
     * encoded, giving a 12KB * (4/3) = 16KB FMTP line. */
271
    char value[16384];
272
    int i;
273

    
274
    RTSPStream *rtsp_st = st->priv_data;
275
    AVCodecContext *codec = st->codec;
276
    RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
277

    
278
    /* loop on each attribute */
279
    while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
280
    {
281
        /* grab the codec extra_data from the config parameter of the fmtp line */
282
        sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
283
                              attr, value);
284
        /* Looking for a known attribute */
285
        for (i = 0; attr_names[i].str; ++i) {
286
            if (!strcasecmp(attr, attr_names[i].str)) {
287
                if (attr_names[i].type == ATTR_NAME_TYPE_INT)
288
                    *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
289
                else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
290
                    *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
291
            }
292
        }
293
    }
294
}
295

    
296
/** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
297
 *  and end time.
298
 *  Used for seeking in the rtp stream.
299
 */
300
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
301
{
302
    char buf[256];
303

    
304
    skip_spaces(&p);
305
    if (!av_stristart(p, "npt=", &p))
306
        return;
307

    
308
    *start = AV_NOPTS_VALUE;
309
    *end = AV_NOPTS_VALUE;
310

    
311
    get_word_sep(buf, sizeof(buf), "-", &p);
312
    *start = parse_date(buf, 1);
313
    if (*p == '-') {
314
        p++;
315
        get_word_sep(buf, sizeof(buf), "-", &p);
316
        *end = parse_date(buf, 1);
317
    }
318
//    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
319
//    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
320
}
321

    
322
typedef struct SDPParseState {
323
    /* SDP only */
324
    struct in_addr default_ip;
325
    int default_ttl;
326
    int skip_media; ///< set if an unknown m= line occurs
327
} SDPParseState;
328

    
329
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
330
                           int letter, const char *buf)
331
{
332
    RTSPState *rt = s->priv_data;
333
    char buf1[64], st_type[64];
334
    const char *p;
335
    enum CodecType codec_type;
336
    int payload_type, i;
337
    AVStream *st;
338
    RTSPStream *rtsp_st;
339
    struct in_addr sdp_ip;
340
    int ttl;
341

    
342
    dprintf(s, "sdp: %c='%s'\n", letter, buf);
343

    
344
    p = buf;
345
    if (s1->skip_media && letter != 'm')
346
        return;
347
    switch(letter) {
348
    case 'c':
349
        get_word(buf1, sizeof(buf1), &p);
350
        if (strcmp(buf1, "IN") != 0)
351
            return;
352
        get_word(buf1, sizeof(buf1), &p);
353
        if (strcmp(buf1, "IP4") != 0)
354
            return;
355
        get_word_sep(buf1, sizeof(buf1), "/", &p);
356
        if (inet_aton(buf1, &sdp_ip) == 0)
357
            return;
358
        ttl = 16;
359
        if (*p == '/') {
360
            p++;
361
            get_word_sep(buf1, sizeof(buf1), "/", &p);
362
            ttl = atoi(buf1);
363
        }
364
        if (s->nb_streams == 0) {
365
            s1->default_ip = sdp_ip;
366
            s1->default_ttl = ttl;
367
        } else {
368
            st = s->streams[s->nb_streams - 1];
369
            rtsp_st = st->priv_data;
370
            rtsp_st->sdp_ip = sdp_ip;
371
            rtsp_st->sdp_ttl = ttl;
372
        }
373
        break;
374
    case 's':
375
        av_metadata_set(&s->metadata, "title", p);
376
        break;
377
    case 'i':
378
        if (s->nb_streams == 0) {
379
            av_metadata_set(&s->metadata, "comment", p);
380
            break;
381
        }
382
        break;
383
    case 'm':
384
        /* new stream */
385
        s1->skip_media = 0;
386
        get_word(st_type, sizeof(st_type), &p);
387
        if (!strcmp(st_type, "audio")) {
388
            codec_type = CODEC_TYPE_AUDIO;
389
        } else if (!strcmp(st_type, "video")) {
390
            codec_type = CODEC_TYPE_VIDEO;
391
        } else if (!strcmp(st_type, "application")) {
392
            codec_type = CODEC_TYPE_DATA;
393
        } else {
394
            s1->skip_media = 1;
395
            return;
396
        }
397
        rtsp_st = av_mallocz(sizeof(RTSPStream));
398
        if (!rtsp_st)
399
            return;
400
        rtsp_st->stream_index = -1;
401
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
402

    
403
        rtsp_st->sdp_ip = s1->default_ip;
404
        rtsp_st->sdp_ttl = s1->default_ttl;
405

    
406
        get_word(buf1, sizeof(buf1), &p); /* port */
407
        rtsp_st->sdp_port = atoi(buf1);
408

    
409
        get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
410

    
411
        /* XXX: handle list of formats */
412
        get_word(buf1, sizeof(buf1), &p); /* format list */
413
        rtsp_st->sdp_payload_type = atoi(buf1);
414

    
415
        if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
416
            /* no corresponding stream */
417
        } else {
418
            st = av_new_stream(s, 0);
419
            if (!st)
420
                return;
421
            st->priv_data = rtsp_st;
422
            rtsp_st->stream_index = st->index;
423
            st->codec->codec_type = codec_type;
424
            if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
425
                /* if standard payload type, we can find the codec right now */
426
                ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
427
            }
428
        }
429
        /* put a default control url */
430
        av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
431
        break;
432
    case 'a':
433
        if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
434
            char proto[32];
435
            /* get the control url */
436
            st = s->streams[s->nb_streams - 1];
437
            rtsp_st = st->priv_data;
438

    
439
            /* XXX: may need to add full url resolution */
440
            url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
441
            if (proto[0] == '\0') {
442
                /* relative control URL */
443
                av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
444
                av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
445
            } else {
446
                av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
447
            }
448
        } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
449
            /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
450
            get_word(buf1, sizeof(buf1), &p);
451
            payload_type = atoi(buf1);
452
            st = s->streams[s->nb_streams - 1];
453
            rtsp_st = st->priv_data;
454
            sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
455
        } else if (av_strstart(p, "fmtp:", &p)) {
456
            /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
457
            get_word(buf1, sizeof(buf1), &p);
458
            payload_type = atoi(buf1);
459
            for(i = 0; i < s->nb_streams;i++) {
460
                st = s->streams[i];
461
                rtsp_st = st->priv_data;
462
                if (rtsp_st->sdp_payload_type == payload_type) {
463
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
464
                        if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
465
                            sdp_parse_fmtp(st, p);
466
                        }
467
                    } else {
468
                        sdp_parse_fmtp(st, p);
469
                    }
470
                }
471
            }
472
        } else if(av_strstart(p, "framesize:", &p)) {
473
            // let dynamic protocol handlers have a stab at the line.
474
            get_word(buf1, sizeof(buf1), &p);
475
            payload_type = atoi(buf1);
476
            for(i = 0; i < s->nb_streams;i++) {
477
                st = s->streams[i];
478
                rtsp_st = st->priv_data;
479
                if (rtsp_st->sdp_payload_type == payload_type) {
480
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
481
                        rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
482
                    }
483
                }
484
            }
485
        } else if(av_strstart(p, "range:", &p)) {
486
            int64_t start, end;
487

    
488
            // this is so that seeking on a streamed file can work.
489
            rtsp_parse_range_npt(p, &start, &end);
490
            s->start_time= start;
491
            s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
492
        } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
493
            if (atoi(p) == 1)
494
                rt->transport = RTSP_TRANSPORT_RDT;
495
        } else {
496
            if (rt->server_type == RTSP_SERVER_WMS)
497
                ff_wms_parse_sdp_a_line(s, p);
498
            if (s->nb_streams > 0) {
499
                if (rt->server_type == RTSP_SERVER_REAL)
500
                    ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
501

    
502
                rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
503
                if (rtsp_st->dynamic_handler &&
504
                    rtsp_st->dynamic_handler->parse_sdp_a_line)
505
                    rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
506
                        rtsp_st->dynamic_protocol_context, buf);
507
            }
508
        }
509
        break;
510
    }
511
}
512

    
513
static int sdp_parse(AVFormatContext *s, const char *content)
514
{
515
    const char *p;
516
    int letter;
517
    /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
518
     * contain long SDP lines containing complete ASF Headers (several
519
     * kB) or arrays of MDPR (RM stream descriptor) headers plus
520
     * "rulebooks" describing their properties. Therefore, the SDP line
521
     * buffer is large.
522
     *
523
     * The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
524
    char buf[16384], *q;
525
    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
526

    
527
    memset(s1, 0, sizeof(SDPParseState));
528
    p = content;
529
    for(;;) {
530
        skip_spaces(&p);
531
        letter = *p;
532
        if (letter == '\0')
533
            break;
534
        p++;
535
        if (*p != '=')
536
            goto next_line;
537
        p++;
538
        /* get the content */
539
        q = buf;
540
        while (*p != '\n' && *p != '\r' && *p != '\0') {
541
            if ((q - buf) < sizeof(buf) - 1)
542
                *q++ = *p;
543
            p++;
544
        }
545
        *q = '\0';
546
        sdp_parse_line(s, s1, letter, buf);
547
    next_line:
548
        while (*p != '\n' && *p != '\0')
549
            p++;
550
        if (*p == '\n')
551
            p++;
552
    }
553
    return 0;
554
}
555

    
556
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
557
{
558
    const char *p;
559
    int v;
560

    
561
    p = *pp;
562
    skip_spaces(&p);
563
    v = strtol(p, (char **)&p, 10);
564
    if (*p == '-') {
565
        p++;
566
        *min_ptr = v;
567
        v = strtol(p, (char **)&p, 10);
568
        *max_ptr = v;
569
    } else {
570
        *min_ptr = v;
571
        *max_ptr = v;
572
    }
573
    *pp = p;
574
}
575

    
576
/* XXX: only one transport specification is parsed */
577
static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
578
{
579
    char transport_protocol[16];
580
    char profile[16];
581
    char lower_transport[16];
582
    char parameter[16];
583
    RTSPTransportField *th;
584
    char buf[256];
585

    
586
    reply->nb_transports = 0;
587

    
588
    for(;;) {
589
        skip_spaces(&p);
590
        if (*p == '\0')
591
            break;
592

    
593
        th = &reply->transports[reply->nb_transports];
594

    
595
        get_word_sep(transport_protocol, sizeof(transport_protocol),
596
                     "/", &p);
597
        if (!strcasecmp (transport_protocol, "rtp")) {
598
            get_word_sep(profile, sizeof(profile), "/;,", &p);
599
            lower_transport[0] = '\0';
600
            /* rtp/avp/<protocol> */
601
            if (*p == '/') {
602
                get_word_sep(lower_transport, sizeof(lower_transport),
603
                             ";,", &p);
604
            }
605
            th->transport = RTSP_TRANSPORT_RTP;
606
        } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
607
                   !strcasecmp (transport_protocol, "x-real-rdt")) {
608
            /* x-pn-tng/<protocol> */
609
            get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
610
            profile[0] = '\0';
611
            th->transport = RTSP_TRANSPORT_RDT;
612
        }
613
        if (!strcasecmp(lower_transport, "TCP"))
614
            th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
615
        else
616
            th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
617

    
618
        if (*p == ';')
619
            p++;
620
        /* get each parameter */
621
        while (*p != '\0' && *p != ',') {
622
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
623
            if (!strcmp(parameter, "port")) {
624
                if (*p == '=') {
625
                    p++;
626
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
627
                }
628
            } else if (!strcmp(parameter, "client_port")) {
629
                if (*p == '=') {
630
                    p++;
631
                    rtsp_parse_range(&th->client_port_min,
632
                                     &th->client_port_max, &p);
633
                }
634
            } else if (!strcmp(parameter, "server_port")) {
635
                if (*p == '=') {
636
                    p++;
637
                    rtsp_parse_range(&th->server_port_min,
638
                                     &th->server_port_max, &p);
639
                }
640
            } else if (!strcmp(parameter, "interleaved")) {
641
                if (*p == '=') {
642
                    p++;
643
                    rtsp_parse_range(&th->interleaved_min,
644
                                     &th->interleaved_max, &p);
645
                }
646
            } else if (!strcmp(parameter, "multicast")) {
647
                if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
648
                    th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
649
            } else if (!strcmp(parameter, "ttl")) {
650
                if (*p == '=') {
651
                    p++;
652
                    th->ttl = strtol(p, (char **)&p, 10);
653
                }
654
            } else if (!strcmp(parameter, "destination")) {
655
                struct in_addr ipaddr;
656

    
657
                if (*p == '=') {
658
                    p++;
659
                    get_word_sep(buf, sizeof(buf), ";,", &p);
660
                    if (inet_aton(buf, &ipaddr))
661
                        th->destination = ntohl(ipaddr.s_addr);
662
                }
663
            }
664
            while (*p != ';' && *p != '\0' && *p != ',')
665
                p++;
666
            if (*p == ';')
667
                p++;
668
        }
669
        if (*p == ',')
670
            p++;
671

    
672
        reply->nb_transports++;
673
    }
674
}
675

    
676
void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
677
{
678
    const char *p;
679

    
680
    /* NOTE: we do case independent match for broken servers */
681
    p = buf;
682
    if (av_stristart(p, "Session:", &p)) {
683
        int t;
684
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
685
        if (av_stristart(p, ";timeout=", &p) &&
686
            (t = strtol(p, NULL, 10)) > 0) {
687
            reply->timeout = t;
688
        }
689
    } else if (av_stristart(p, "Content-Length:", &p)) {
690
        reply->content_length = strtol(p, NULL, 10);
691
    } else if (av_stristart(p, "Transport:", &p)) {
692
        rtsp_parse_transport(reply, p);
693
    } else if (av_stristart(p, "CSeq:", &p)) {
694
        reply->seq = strtol(p, NULL, 10);
695
    } else if (av_stristart(p, "Range:", &p)) {
696
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
697
    } else if (av_stristart(p, "RealChallenge1:", &p)) {
698
        skip_spaces(&p);
699
        av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
700
    } else if (av_stristart(p, "Server:", &p)) {
701
        skip_spaces(&p);
702
        av_strlcpy(reply->server, p, sizeof(reply->server));
703
    }
704
}
705

    
706
static int url_readbuf(URLContext *h, unsigned char *buf, int size)
707
{
708
    int ret, len;
709

    
710
    len = 0;
711
    while (len < size) {
712
        ret = url_read(h, buf+len, size-len);
713
        if (ret < 1)
714
            return ret;
715
        len += ret;
716
    }
717
    return len;
718
}
719

    
720
/* skip a RTP/TCP interleaved packet */
721
static void rtsp_skip_packet(AVFormatContext *s)
722
{
723
    RTSPState *rt = s->priv_data;
724
    int ret, len, len1;
725
    uint8_t buf[1024];
726

    
727
    ret = url_readbuf(rt->rtsp_hd, buf, 3);
728
    if (ret != 3)
729
        return;
730
    len = AV_RB16(buf + 1);
731

    
732
    dprintf(s, "skipping RTP packet len=%d\n", len);
733

    
734
    /* skip payload */
735
    while (len > 0) {
736
        len1 = len;
737
        if (len1 > sizeof(buf))
738
            len1 = sizeof(buf);
739
        ret = url_readbuf(rt->rtsp_hd, buf, len1);
740
        if (ret != len1)
741
            return;
742
        len -= len1;
743
    }
744
}
745

    
746
/**
747
 * Read a RTSP message from the server, or prepare to read data
748
 * packets if we're reading data interleaved over the TCP/RTSP
749
 * connection as well.
750
 *
751
 * @param s RTSP demuxer context
752
 * @param reply pointer where the RTSP message header will be stored
753
 * @param content_ptr pointer where the RTSP message body, if any, will
754
 *                    be stored (length is in \p reply)
755
 * @param return_on_interleaved_data whether the function may return if we
756
 *                   encounter a data marker ('$'), which precedes data
757
 *                   packets over interleaved TCP/RTSP connections. If this
758
 *                   is set, this function will return 1 after encountering
759
 *                   a '$'. If it is not set, the function will skip any
760
 *                   data packets (if they are encountered), until a reply
761
 *                   has been fully parsed. If no more data is available
762
 *                   without parsing a reply, it will return an error.
763
 *
764
 * @returns 1 if a data packets is ready to be received, -1 on error,
765
 *          and 0 on success.
766
 */
767
static int
768
rtsp_read_reply (AVFormatContext *s, RTSPMessageHeader *reply,
769
                 unsigned char **content_ptr, int return_on_interleaved_data)
770
{
771
    RTSPState *rt = s->priv_data;
772
    char buf[4096], buf1[1024], *q;
773
    unsigned char ch;
774
    const char *p;
775
    int ret, content_length, line_count = 0;
776
    unsigned char *content = NULL;
777

    
778
    memset(reply, 0, sizeof(*reply));
779

    
780
    /* parse reply (XXX: use buffers) */
781
    rt->last_reply[0] = '\0';
782
    for(;;) {
783
        q = buf;
784
        for(;;) {
785
            ret = url_readbuf(rt->rtsp_hd, &ch, 1);
786
#ifdef DEBUG_RTP_TCP
787
            dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
788
#endif
789
            if (ret != 1)
790
                return -1;
791
            if (ch == '\n')
792
                break;
793
            if (ch == '$') {
794
                /* XXX: only parse it if first char on line ? */
795
                if (return_on_interleaved_data) {
796
                    return 1;
797
                } else
798
                rtsp_skip_packet(s);
799
            } else if (ch != '\r') {
800
                if ((q - buf) < sizeof(buf) - 1)
801
                    *q++ = ch;
802
            }
803
        }
804
        *q = '\0';
805

    
806
        dprintf(s, "line='%s'\n", buf);
807

    
808
        /* test if last line */
809
        if (buf[0] == '\0')
810
            break;
811
        p = buf;
812
        if (line_count == 0) {
813
            /* get reply code */
814
            get_word(buf1, sizeof(buf1), &p);
815
            get_word(buf1, sizeof(buf1), &p);
816
            reply->status_code = atoi(buf1);
817
        } else {
818
            rtsp_parse_line(reply, p);
819
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
820
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
821
        }
822
        line_count++;
823
    }
824

    
825
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
826
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
827

    
828
    content_length = reply->content_length;
829
    if (content_length > 0) {
830
        /* leave some room for a trailing '\0' (useful for simple parsing) */
831
        content = av_malloc(content_length + 1);
832
        (void)url_readbuf(rt->rtsp_hd, content, content_length);
833
        content[content_length] = '\0';
834
    }
835
    if (content_ptr)
836
        *content_ptr = content;
837
    else
838
        av_free(content);
839

    
840
    return 0;
841
}
842

    
843
static void rtsp_send_cmd_async (AVFormatContext *s,
844
                          const char *cmd, RTSPMessageHeader *reply,
845
                          unsigned char **content_ptr)
846
{
847
    RTSPState *rt = s->priv_data;
848
    char buf[4096], buf1[1024];
849

    
850
    rt->seq++;
851
    av_strlcpy(buf, cmd, sizeof(buf));
852
    snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
853
    av_strlcat(buf, buf1, sizeof(buf));
854
    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
855
        snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
856
        av_strlcat(buf, buf1, sizeof(buf));
857
    }
858
    av_strlcat(buf, "\r\n", sizeof(buf));
859

    
860
    dprintf(s, "Sending:\n%s--\n", buf);
861

    
862
    url_write(rt->rtsp_hd, buf, strlen(buf));
863
    rt->last_cmd_time = av_gettime();
864
}
865

    
866
static void rtsp_send_cmd (AVFormatContext *s,
867
                           const char *cmd, RTSPMessageHeader *reply,
868
                           unsigned char **content_ptr)
869
{
870
    rtsp_send_cmd_async(s, cmd, reply, content_ptr);
871

    
872
    rtsp_read_reply(s, reply, content_ptr, 0);
873
}
874

    
875

    
876
/* close and free RTSP streams */
877
static void rtsp_close_streams(RTSPState *rt)
878
{
879
    int i;
880
    RTSPStream *rtsp_st;
881

    
882
    for(i=0;i<rt->nb_rtsp_streams;i++) {
883
        rtsp_st = rt->rtsp_streams[i];
884
        if (rtsp_st) {
885
            if (rtsp_st->transport_priv) {
886
                if (rt->transport == RTSP_TRANSPORT_RDT)
887
                    ff_rdt_parse_close(rtsp_st->transport_priv);
888
                else
889
                    rtp_parse_close(rtsp_st->transport_priv);
890
            }
891
            if (rtsp_st->rtp_handle)
892
                url_close(rtsp_st->rtp_handle);
893
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
894
                rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
895
        }
896
    }
897
    av_free(rt->rtsp_streams);
898
    if (rt->asf_ctx) {
899
        av_close_input_stream (rt->asf_ctx);
900
        rt->asf_ctx = NULL;
901
    }
902
}
903

    
904
static int
905
rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
906
{
907
    RTSPState *rt = s->priv_data;
908
    AVStream *st = NULL;
909

    
910
    /* open the RTP context */
911
    if (rtsp_st->stream_index >= 0)
912
        st = s->streams[rtsp_st->stream_index];
913
    if (!st)
914
        s->ctx_flags |= AVFMTCTX_NOHEADER;
915

    
916
    if (rt->transport == RTSP_TRANSPORT_RDT)
917
        rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
918
                                            rtsp_st->dynamic_protocol_context,
919
                                            rtsp_st->dynamic_handler);
920
    else
921
        rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
922
                                         rtsp_st->sdp_payload_type,
923
                                         &rtsp_st->rtp_payload_data);
924

    
925
    if (!rtsp_st->transport_priv) {
926
         return AVERROR(ENOMEM);
927
    } else if (rt->transport != RTSP_TRANSPORT_RDT) {
928
        if(rtsp_st->dynamic_handler) {
929
            rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
930
                                           rtsp_st->dynamic_protocol_context,
931
                                           rtsp_st->dynamic_handler);
932
        }
933
    }
934

    
935
    return 0;
936
}
937

    
938
/**
939
 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
940
 */
941
static int
942
make_setup_request (AVFormatContext *s, const char *host, int port,
943
                    int lower_transport, const char *real_challenge)
944
{
945
    RTSPState *rt = s->priv_data;
946
    int rtx, j, i, err, interleave = 0;
947
    RTSPStream *rtsp_st;
948
    RTSPMessageHeader reply1, *reply = &reply1;
949
    char cmd[2048];
950
    const char *trans_pref;
951

    
952
    if (rt->transport == RTSP_TRANSPORT_RDT)
953
        trans_pref = "x-pn-tng";
954
    else
955
        trans_pref = "RTP/AVP";
956

    
957
    /* default timeout: 1 minute */
958
    rt->timeout = 60;
959

    
960
    /* for each stream, make the setup request */
961
    /* XXX: we assume the same server is used for the control of each
962
       RTSP stream */
963

    
964
    for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
965
        char transport[2048];
966

    
967
        /**
968
         * WMS serves all UDP data over a single connection, the RTX, which
969
         * isn't necessarily the first in the SDP but has to be the first
970
         * to be set up, else the second/third SETUP will fail with a 461.
971
         */
972
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
973
             rt->server_type == RTSP_SERVER_WMS) {
974
            if (i == 0) {
975
                /* rtx first */
976
                for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
977
                    int len = strlen(rt->rtsp_streams[rtx]->control_url);
978
                    if (len >= 4 &&
979
                        !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4, "/rtx"))
980
                        break;
981
                }
982
                if (rtx == rt->nb_rtsp_streams)
983
                    return -1; /* no RTX found */
984
                rtsp_st = rt->rtsp_streams[rtx];
985
            } else
986
                rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
987
        } else
988
            rtsp_st = rt->rtsp_streams[i];
989

    
990
        /* RTP/UDP */
991
        if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
992
            char buf[256];
993

    
994
            if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
995
                port = reply->transports[0].client_port_min;
996
                goto have_port;
997
            }
998

    
999
            /* first try in specified port range */
1000
            if (RTSP_RTP_PORT_MIN != 0) {
1001
                while(j <= RTSP_RTP_PORT_MAX) {
1002
                    snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
1003
                    j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
1004
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
1005
                        goto rtp_opened;
1006
                    }
1007
                }
1008
            }
1009

    
1010
/*            then try on any port
1011
**            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1012
**                err = AVERROR_INVALIDDATA;
1013
**                goto fail;
1014
**            }
1015
*/
1016

    
1017
        rtp_opened:
1018
            port = rtp_get_local_port(rtsp_st->rtp_handle);
1019
        have_port:
1020
            snprintf(transport, sizeof(transport) - 1,
1021
                     "%s/UDP;", trans_pref);
1022
            if (rt->server_type != RTSP_SERVER_REAL)
1023
                av_strlcat(transport, "unicast;", sizeof(transport));
1024
            av_strlcatf(transport, sizeof(transport),
1025
                     "client_port=%d", port);
1026
            if (rt->transport == RTSP_TRANSPORT_RTP &&
1027
                !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1028
                av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1029
        }
1030

    
1031
        /* RTP/TCP */
1032
        else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1033
            /** For WMS streams, the application streams are only used for
1034
             * UDP. When trying to set it up for TCP streams, the server
1035
             * will return an error. Therefore, we skip those streams. */
1036
            if (rt->server_type == RTSP_SERVER_WMS &&
1037
                s->streams[rtsp_st->stream_index]->codec->codec_type == CODEC_TYPE_DATA)
1038
                continue;
1039
            snprintf(transport, sizeof(transport) - 1,
1040
                     "%s/TCP;", trans_pref);
1041
            if (rt->server_type == RTSP_SERVER_WMS)
1042
                av_strlcat(transport, "unicast;", sizeof(transport));
1043
            av_strlcatf(transport, sizeof(transport),
1044
                        "interleaved=%d-%d",
1045
                        interleave, interleave + 1);
1046
            interleave += 2;
1047
        }
1048

    
1049
        else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1050
            snprintf(transport, sizeof(transport) - 1,
1051
                     "%s/UDP;multicast", trans_pref);
1052
        }
1053
        if (rt->server_type == RTSP_SERVER_REAL ||
1054
            rt->server_type == RTSP_SERVER_WMS)
1055
            av_strlcat(transport, ";mode=play", sizeof(transport));
1056
        snprintf(cmd, sizeof(cmd),
1057
                 "SETUP %s RTSP/1.0\r\n"
1058
                 "Transport: %s\r\n",
1059
                 rtsp_st->control_url, transport);
1060
        if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1061
            char real_res[41], real_csum[9];
1062
            ff_rdt_calc_response_and_checksum(real_res, real_csum,
1063
                                              real_challenge);
1064
            av_strlcatf(cmd, sizeof(cmd),
1065
                        "If-Match: %s\r\n"
1066
                        "RealChallenge2: %s, sd=%s\r\n",
1067
                        rt->session_id, real_res, real_csum);
1068
        }
1069
        rtsp_send_cmd(s, cmd, reply, NULL);
1070
        if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1071
            err = 1;
1072
            goto fail;
1073
        } else if (reply->status_code != RTSP_STATUS_OK ||
1074
                   reply->nb_transports != 1) {
1075
            err = AVERROR_INVALIDDATA;
1076
            goto fail;
1077
        }
1078

    
1079
        /* XXX: same protocol for all streams is required */
1080
        if (i > 0) {
1081
            if (reply->transports[0].lower_transport != rt->lower_transport ||
1082
                reply->transports[0].transport != rt->transport) {
1083
                err = AVERROR_INVALIDDATA;
1084
                goto fail;
1085
            }
1086
        } else {
1087
            rt->lower_transport = reply->transports[0].lower_transport;
1088
            rt->transport = reply->transports[0].transport;
1089
        }
1090

    
1091
        /* close RTP connection if not choosen */
1092
        if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1093
            (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1094
            url_close(rtsp_st->rtp_handle);
1095
            rtsp_st->rtp_handle = NULL;
1096
        }
1097

    
1098
        switch(reply->transports[0].lower_transport) {
1099
        case RTSP_LOWER_TRANSPORT_TCP:
1100
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1101
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1102
            break;
1103

    
1104
        case RTSP_LOWER_TRANSPORT_UDP:
1105
            {
1106
                char url[1024];
1107

    
1108
                /* XXX: also use address if specified */
1109
                snprintf(url, sizeof(url), "rtp://%s:%d",
1110
                         host, reply->transports[0].server_port_min);
1111
                if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1112
                    rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1113
                    err = AVERROR_INVALIDDATA;
1114
                    goto fail;
1115
                }
1116
            }
1117
            break;
1118
        case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1119
            {
1120
                char url[1024];
1121
                struct in_addr in;
1122

    
1123
                in.s_addr = htonl(reply->transports[0].destination);
1124
                snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1125
                         inet_ntoa(in),
1126
                         reply->transports[0].port_min,
1127
                         reply->transports[0].ttl);
1128
                if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1129
                    err = AVERROR_INVALIDDATA;
1130
                    goto fail;
1131
                }
1132
            }
1133
            break;
1134
        }
1135

    
1136
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1137
            goto fail;
1138
    }
1139

    
1140
    if (reply->timeout > 0)
1141
        rt->timeout = reply->timeout;
1142

    
1143
    if (rt->server_type == RTSP_SERVER_REAL)
1144
        rt->need_subscription = 1;
1145

    
1146
    return 0;
1147

    
1148
fail:
1149
    for (i=0; i<rt->nb_rtsp_streams; i++) {
1150
        if (rt->rtsp_streams[i]->rtp_handle) {
1151
            url_close(rt->rtsp_streams[i]->rtp_handle);
1152
            rt->rtsp_streams[i]->rtp_handle = NULL;
1153
        }
1154
    }
1155
    return err;
1156
}
1157

    
1158
static int rtsp_read_header(AVFormatContext *s,
1159
                            AVFormatParameters *ap)
1160
{
1161
    RTSPState *rt = s->priv_data;
1162
    char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1163
    URLContext *rtsp_hd;
1164
    int port, ret, err;
1165
    RTSPMessageHeader reply1, *reply = &reply1;
1166
    unsigned char *content = NULL;
1167
    int lower_transport_mask = 0;
1168
    char real_challenge[64];
1169

    
1170
    /* extract hostname and port */
1171
    url_split(NULL, 0, NULL, 0,
1172
              host, sizeof(host), &port, path, sizeof(path), s->filename);
1173
    if (port < 0)
1174
        port = RTSP_DEFAULT_PORT;
1175

    
1176
    /* search for options */
1177
    option_list = strchr(path, '?');
1178
    if (option_list) {
1179
        /* remove the options from the path */
1180
        *option_list++ = 0;
1181
        while(option_list) {
1182
            /* move the option pointer */
1183
            option = option_list;
1184
            option_list = strchr(option_list, '&');
1185
            if (option_list)
1186
                *(option_list++) = 0;
1187
            /* handle the options */
1188
            if (strcmp(option, "udp") == 0)
1189
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1190
            else if (strcmp(option, "multicast") == 0)
1191
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1192
            else if (strcmp(option, "tcp") == 0)
1193
                lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1194
        }
1195
    }
1196

    
1197
    if (!lower_transport_mask)
1198
        lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1199

    
1200
    /* open the tcp connexion */
1201
    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1202
    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1203
        return AVERROR(EIO);
1204
    rt->rtsp_hd = rtsp_hd;
1205
    rt->seq = 0;
1206

    
1207
    /* request options supported by the server; this also detects server type */
1208
    for (rt->server_type = RTSP_SERVER_RTP;;) {
1209
        snprintf(cmd, sizeof(cmd),
1210
                 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1211
        if (rt->server_type == RTSP_SERVER_REAL)
1212
            av_strlcat(cmd,
1213
                       /**
1214
                        * The following entries are required for proper
1215
                        * streaming from a Realmedia server. They are
1216
                        * interdependent in some way although we currently
1217
                        * don't quite understand how. Values were copied
1218
                        * from mplayer SVN r23589.
1219
                        * @param CompanyID is a 16-byte ID in base64
1220
                        * @param ClientChallenge is a 16-byte ID in hex
1221
                        */
1222
                       "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1223
                       "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1224
                       "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1225
                       "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1226
                       sizeof(cmd));
1227
        rtsp_send_cmd(s, cmd, reply, NULL);
1228
        if (reply->status_code != RTSP_STATUS_OK) {
1229
            err = AVERROR_INVALIDDATA;
1230
            goto fail;
1231
        }
1232

    
1233
        /* detect server type if not standard-compliant RTP */
1234
        if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1235
            rt->server_type = RTSP_SERVER_REAL;
1236
            continue;
1237
        } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1238
            rt->server_type = RTSP_SERVER_WMS;
1239
        } else if (rt->server_type == RTSP_SERVER_REAL) {
1240
            strcpy(real_challenge, reply->real_challenge);
1241
        }
1242
        break;
1243
    }
1244

    
1245
    /* describe the stream */
1246
    snprintf(cmd, sizeof(cmd),
1247
             "DESCRIBE %s RTSP/1.0\r\n"
1248
             "Accept: application/sdp\r\n",
1249
             s->filename);
1250
    if (rt->server_type == RTSP_SERVER_REAL) {
1251
        /**
1252
         * The Require: attribute is needed for proper streaming from
1253
         * Realmedia servers.
1254
         */
1255
        av_strlcat(cmd,
1256
                   "Require: com.real.retain-entity-for-setup\r\n",
1257
                   sizeof(cmd));
1258
    }
1259
    rtsp_send_cmd(s, cmd, reply, &content);
1260
    if (!content) {
1261
        err = AVERROR_INVALIDDATA;
1262
        goto fail;
1263
    }
1264
    if (reply->status_code != RTSP_STATUS_OK) {
1265
        err = AVERROR_INVALIDDATA;
1266
        goto fail;
1267
    }
1268

    
1269
    /* now we got the SDP description, we parse it */
1270
    ret = sdp_parse(s, (const char *)content);
1271
    av_freep(&content);
1272
    if (ret < 0) {
1273
        err = AVERROR_INVALIDDATA;
1274
        goto fail;
1275
    }
1276

    
1277
    do {
1278
        int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1279

    
1280
        err = make_setup_request(s, host, port, lower_transport,
1281
                                 rt->server_type == RTSP_SERVER_REAL ?
1282
                                     real_challenge : NULL);
1283
        if (err < 0)
1284
            goto fail;
1285
        lower_transport_mask &= ~(1 << lower_transport);
1286
        if (lower_transport_mask == 0 && err == 1) {
1287
            err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1288
            goto fail;
1289
        }
1290
    } while (err);
1291

    
1292
    rt->state = RTSP_STATE_IDLE;
1293
    rt->seek_timestamp = 0; /* default is to start stream at position
1294
                               zero */
1295
    if (ap->initial_pause) {
1296
        /* do not start immediately */
1297
    } else {
1298
        if (rtsp_read_play(s) < 0) {
1299
            err = AVERROR_INVALIDDATA;
1300
            goto fail;
1301
        }
1302
    }
1303
    return 0;
1304
 fail:
1305
    rtsp_close_streams(rt);
1306
    av_freep(&content);
1307
    url_close(rt->rtsp_hd);
1308
    return err;
1309
}
1310

    
1311
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1312
                           uint8_t *buf, int buf_size)
1313
{
1314
    RTSPState *rt = s->priv_data;
1315
    int id, len, i, ret;
1316
    RTSPStream *rtsp_st;
1317

    
1318
#ifdef DEBUG_RTP_TCP
1319
    dprintf(s, "tcp_read_packet:\n");
1320
#endif
1321
 redo:
1322
    for(;;) {
1323
        RTSPMessageHeader reply;
1324

    
1325
        ret = rtsp_read_reply(s, &reply, NULL, 1);
1326
        if (ret == -1)
1327
            return -1;
1328
        if (ret == 1) /* received '$' */
1329
            break;
1330
        /* XXX: parse message */
1331
    }
1332
    ret = url_readbuf(rt->rtsp_hd, buf, 3);
1333
    if (ret != 3)
1334
        return -1;
1335
    id = buf[0];
1336
    len = AV_RB16(buf + 1);
1337
#ifdef DEBUG_RTP_TCP
1338
    dprintf(s, "id=%d len=%d\n", id, len);
1339
#endif
1340
    if (len > buf_size || len < 12)
1341
        goto redo;
1342
    /* get the data */
1343
    ret = url_readbuf(rt->rtsp_hd, buf, len);
1344
    if (ret != len)
1345
        return -1;
1346
    if (rt->transport == RTSP_TRANSPORT_RDT &&
1347
        ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1348
        return -1;
1349

    
1350
    /* find the matching stream */
1351
    for(i = 0; i < rt->nb_rtsp_streams; i++) {
1352
        rtsp_st = rt->rtsp_streams[i];
1353
        if (id >= rtsp_st->interleaved_min &&
1354
            id <= rtsp_st->interleaved_max)
1355
            goto found;
1356
    }
1357
    goto redo;
1358
 found:
1359
    *prtsp_st = rtsp_st;
1360
    return len;
1361
}
1362

    
1363
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1364
                           uint8_t *buf, int buf_size)
1365
{
1366
    RTSPState *rt = s->priv_data;
1367
    RTSPStream *rtsp_st;
1368
    fd_set rfds;
1369
    int fd, fd_max, n, i, ret, tcp_fd;
1370
    struct timeval tv;
1371

    
1372
    for(;;) {
1373
        if (url_interrupt_cb())
1374
            return AVERROR(EINTR);
1375
        FD_ZERO(&rfds);
1376
        if (rt->rtsp_hd) {
1377
            tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1378
            FD_SET(tcp_fd, &rfds);
1379
        } else {
1380
            fd_max = 0;
1381
            tcp_fd = -1;
1382
        }
1383
        for(i = 0; i < rt->nb_rtsp_streams; i++) {
1384
            rtsp_st = rt->rtsp_streams[i];
1385
            if (rtsp_st->rtp_handle) {
1386
                /* currently, we cannot probe RTCP handle because of
1387
                 * blocking restrictions */
1388
                fd = url_get_file_handle(rtsp_st->rtp_handle);
1389
                if (fd > fd_max)
1390
                    fd_max = fd;
1391
                FD_SET(fd, &rfds);
1392
            }
1393
        }
1394
        tv.tv_sec = 0;
1395
        tv.tv_usec = 100 * 1000;
1396
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1397
        if (n > 0) {
1398
            for(i = 0; i < rt->nb_rtsp_streams; i++) {
1399
                rtsp_st = rt->rtsp_streams[i];
1400
                if (rtsp_st->rtp_handle) {
1401
                    fd = url_get_file_handle(rtsp_st->rtp_handle);
1402
                    if (FD_ISSET(fd, &rfds)) {
1403
                        ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1404
                        if (ret > 0) {
1405
                            *prtsp_st = rtsp_st;
1406
                            return ret;
1407
                        }
1408
                    }
1409
                }
1410
            }
1411
            if (FD_ISSET(tcp_fd, &rfds)) {
1412
                RTSPMessageHeader reply;
1413

    
1414
                rtsp_read_reply(s, &reply, NULL, 0);
1415
                /* XXX: parse message */
1416
            }
1417
        }
1418
    }
1419
}
1420

    
1421
static int rtsp_read_packet(AVFormatContext *s,
1422
                            AVPacket *pkt)
1423
{
1424
    RTSPState *rt = s->priv_data;
1425
    RTSPStream *rtsp_st;
1426
    int ret, len;
1427
    uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1428
    RTSPMessageHeader reply1, *reply = &reply1;
1429
    char cmd[1024];
1430

    
1431
    if (rt->server_type == RTSP_SERVER_REAL) {
1432
        int i;
1433
        enum AVDiscard cache[MAX_STREAMS];
1434

    
1435
        for (i = 0; i < s->nb_streams; i++)
1436
            cache[i] = s->streams[i]->discard;
1437

    
1438
        if (!rt->need_subscription) {
1439
            if (memcmp (cache, rt->real_setup_cache,
1440
                        sizeof(enum AVDiscard) * s->nb_streams)) {
1441
                av_strlcatf(cmd, sizeof(cmd),
1442
                            "SET_PARAMETER %s RTSP/1.0\r\n"
1443
                            "Unsubscribe: %s\r\n",
1444
                            s->filename, rt->last_subscription);
1445
                rtsp_send_cmd(s, cmd, reply, NULL);
1446
                if (reply->status_code != RTSP_STATUS_OK)
1447
                    return AVERROR_INVALIDDATA;
1448
                rt->need_subscription = 1;
1449
            }
1450
        }
1451

    
1452
        if (rt->need_subscription) {
1453
            int r, rule_nr, first = 1;
1454

    
1455
            memcpy(rt->real_setup_cache, cache,
1456
                   sizeof(enum AVDiscard) * s->nb_streams);
1457
            rt->last_subscription[0] = 0;
1458

    
1459
            snprintf(cmd, sizeof(cmd),
1460
                     "SET_PARAMETER %s RTSP/1.0\r\n"
1461
                     "Subscribe: ",
1462
                     s->filename);
1463
            for (i = 0; i < rt->nb_rtsp_streams; i++) {
1464
                rule_nr = 0;
1465
                for (r = 0; r < s->nb_streams; r++) {
1466
                    if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1467
                        if (s->streams[r]->discard != AVDISCARD_ALL) {
1468
                            if (!first)
1469
                                av_strlcat(rt->last_subscription, ",",
1470
                                           sizeof(rt->last_subscription));
1471
                            ff_rdt_subscribe_rule(
1472
                                rt->last_subscription,
1473
                                sizeof(rt->last_subscription), i, rule_nr);
1474
                            first = 0;
1475
                        }
1476
                        rule_nr++;
1477
                    }
1478
                }
1479
            }
1480
            av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1481
            rtsp_send_cmd(s, cmd, reply, NULL);
1482
            if (reply->status_code != RTSP_STATUS_OK)
1483
                return AVERROR_INVALIDDATA;
1484
            rt->need_subscription = 0;
1485

    
1486
            if (rt->state == RTSP_STATE_PLAYING)
1487
                rtsp_read_play (s);
1488
        }
1489
    }
1490

    
1491
    /* get next frames from the same RTP packet */
1492
    if (rt->cur_transport_priv) {
1493
        if (rt->transport == RTSP_TRANSPORT_RDT)
1494
            ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1495
        else
1496
            ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1497
        if (ret == 0) {
1498
            rt->cur_transport_priv = NULL;
1499
            return 0;
1500
        } else if (ret == 1) {
1501
            return 0;
1502
        } else {
1503
            rt->cur_transport_priv = NULL;
1504
        }
1505
    }
1506

    
1507
    /* read next RTP packet */
1508
 redo:
1509
    switch(rt->lower_transport) {
1510
    default:
1511
    case RTSP_LOWER_TRANSPORT_TCP:
1512
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1513
        break;
1514
    case RTSP_LOWER_TRANSPORT_UDP:
1515
    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1516
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1517
        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1518
            rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1519
        break;
1520
    }
1521
    if (len < 0)
1522
        return len;
1523
    if (rt->transport == RTSP_TRANSPORT_RDT)
1524
        ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1525
    else
1526
        ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1527
    if (ret < 0)
1528
        goto redo;
1529
    if (ret == 1) {
1530
        /* more packets may follow, so we save the RTP context */
1531
        rt->cur_transport_priv = rtsp_st->transport_priv;
1532
    }
1533

    
1534
    /* send dummy request to keep TCP connection alive */
1535
    if ((rt->server_type == RTSP_SERVER_WMS ||
1536
         rt->server_type == RTSP_SERVER_REAL) &&
1537
        (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1538
        if (rt->server_type == RTSP_SERVER_WMS) {
1539
            snprintf(cmd, sizeof(cmd) - 1,
1540
                     "GET_PARAMETER %s RTSP/1.0\r\n",
1541
                     s->filename);
1542
            rtsp_send_cmd_async(s, cmd, reply, NULL);
1543
        } else {
1544
            rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n",
1545
                                reply, NULL);
1546
        }
1547
    }
1548

    
1549
    return 0;
1550
}
1551

    
1552
static int rtsp_read_play(AVFormatContext *s)
1553
{
1554
    RTSPState *rt = s->priv_data;
1555
    RTSPMessageHeader reply1, *reply = &reply1;
1556
    char cmd[1024];
1557

    
1558
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1559

    
1560
    if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1561
        if (rt->state == RTSP_STATE_PAUSED) {
1562
            snprintf(cmd, sizeof(cmd),
1563
                     "PLAY %s RTSP/1.0\r\n",
1564
                     s->filename);
1565
        } else {
1566
            snprintf(cmd, sizeof(cmd),
1567
                     "PLAY %s RTSP/1.0\r\n"
1568
                     "Range: npt=%0.3f-\r\n",
1569
                     s->filename,
1570
                     (double)rt->seek_timestamp / AV_TIME_BASE);
1571
        }
1572
        rtsp_send_cmd(s, cmd, reply, NULL);
1573
        if (reply->status_code != RTSP_STATUS_OK) {
1574
            return -1;
1575
        }
1576
    }
1577
    rt->state = RTSP_STATE_PLAYING;
1578
    return 0;
1579
}
1580

    
1581
/* pause the stream */
1582
static int rtsp_read_pause(AVFormatContext *s)
1583
{
1584
    RTSPState *rt = s->priv_data;
1585
    RTSPMessageHeader reply1, *reply = &reply1;
1586
    char cmd[1024];
1587

    
1588
    rt = s->priv_data;
1589

    
1590
    if (rt->state != RTSP_STATE_PLAYING)
1591
        return 0;
1592
    else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1593
        snprintf(cmd, sizeof(cmd),
1594
                 "PAUSE %s RTSP/1.0\r\n",
1595
                 s->filename);
1596
        rtsp_send_cmd(s, cmd, reply, NULL);
1597
        if (reply->status_code != RTSP_STATUS_OK) {
1598
            return -1;
1599
        }
1600
    }
1601
    rt->state = RTSP_STATE_PAUSED;
1602
    return 0;
1603
}
1604

    
1605
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1606
                          int64_t timestamp, int flags)
1607
{
1608
    RTSPState *rt = s->priv_data;
1609

    
1610
    rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1611
    switch(rt->state) {
1612
    default:
1613
    case RTSP_STATE_IDLE:
1614
        break;
1615
    case RTSP_STATE_PLAYING:
1616
        if (rtsp_read_play(s) != 0)
1617
            return -1;
1618
        break;
1619
    case RTSP_STATE_PAUSED:
1620
        rt->state = RTSP_STATE_IDLE;
1621
        break;
1622
    }
1623
    return 0;
1624
}
1625

    
1626
static int rtsp_read_close(AVFormatContext *s)
1627
{
1628
    RTSPState *rt = s->priv_data;
1629
    RTSPMessageHeader reply1, *reply = &reply1;
1630
    char cmd[1024];
1631

    
1632
#if 0
1633
    /* NOTE: it is valid to flush the buffer here */
1634
    if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1635
        url_fclose(&rt->rtsp_gb);
1636
    }
1637
#endif
1638
    snprintf(cmd, sizeof(cmd),
1639
             "TEARDOWN %s RTSP/1.0\r\n",
1640
             s->filename);
1641
    rtsp_send_cmd(s, cmd, reply, NULL);
1642

    
1643
    rtsp_close_streams(rt);
1644
    url_close(rt->rtsp_hd);
1645
    return 0;
1646
}
1647

    
1648
#if CONFIG_RTSP_DEMUXER
1649
AVInputFormat rtsp_demuxer = {
1650
    "rtsp",
1651
    NULL_IF_CONFIG_SMALL("RTSP input format"),
1652
    sizeof(RTSPState),
1653
    rtsp_probe,
1654
    rtsp_read_header,
1655
    rtsp_read_packet,
1656
    rtsp_read_close,
1657
    rtsp_read_seek,
1658
    .flags = AVFMT_NOFILE,
1659
    .read_play = rtsp_read_play,
1660
    .read_pause = rtsp_read_pause,
1661
};
1662
#endif
1663

    
1664
static int sdp_probe(AVProbeData *p1)
1665
{
1666
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1667

    
1668
    /* we look for a line beginning "c=IN IP4" */
1669
    while (p < p_end && *p != '\0') {
1670
        if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1671
            return AVPROBE_SCORE_MAX / 2;
1672

    
1673
        while(p < p_end - 1 && *p != '\n') p++;
1674
        if (++p >= p_end)
1675
            break;
1676
        if (*p == '\r')
1677
            p++;
1678
    }
1679
    return 0;
1680
}
1681

    
1682
#define SDP_MAX_SIZE 8192
1683

    
1684
static int sdp_read_header(AVFormatContext *s,
1685
                           AVFormatParameters *ap)
1686
{
1687
    RTSPState *rt = s->priv_data;
1688
    RTSPStream *rtsp_st;
1689
    int size, i, err;
1690
    char *content;
1691
    char url[1024];
1692

    
1693
    /* read the whole sdp file */
1694
    /* XXX: better loading */
1695
    content = av_malloc(SDP_MAX_SIZE);
1696
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1697
    if (size <= 0) {
1698
        av_free(content);
1699
        return AVERROR_INVALIDDATA;
1700
    }
1701
    content[size] ='\0';
1702

    
1703
    sdp_parse(s, content);
1704
    av_free(content);
1705

    
1706
    /* open each RTP stream */
1707
    for(i=0;i<rt->nb_rtsp_streams;i++) {
1708
        rtsp_st = rt->rtsp_streams[i];
1709

    
1710
        snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1711
                 inet_ntoa(rtsp_st->sdp_ip),
1712
                 rtsp_st->sdp_port,
1713
                 rtsp_st->sdp_port,
1714
                 rtsp_st->sdp_ttl);
1715
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1716
            err = AVERROR_INVALIDDATA;
1717
            goto fail;
1718
        }
1719
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1720
            goto fail;
1721
    }
1722
    return 0;
1723
 fail:
1724
    rtsp_close_streams(rt);
1725
    return err;
1726
}
1727

    
1728
static int sdp_read_packet(AVFormatContext *s,
1729
                            AVPacket *pkt)
1730
{
1731
    return rtsp_read_packet(s, pkt);
1732
}
1733

    
1734
static int sdp_read_close(AVFormatContext *s)
1735
{
1736
    RTSPState *rt = s->priv_data;
1737
    rtsp_close_streams(rt);
1738
    return 0;
1739
}
1740

    
1741
#if CONFIG_SDP_DEMUXER
1742
AVInputFormat sdp_demuxer = {
1743
    "sdp",
1744
    NULL_IF_CONFIG_SMALL("SDP"),
1745
    sizeof(RTSPState),
1746
    sdp_probe,
1747
    sdp_read_header,
1748
    sdp_read_packet,
1749
    sdp_read_close,
1750
};
1751
#endif
1752

    
1753
#if CONFIG_REDIR_DEMUXER
1754
/* dummy redirector format (used directly in av_open_input_file now) */
1755
static int redir_probe(AVProbeData *pd)
1756
{
1757
    const char *p;
1758
    p = pd->buf;
1759
    skip_spaces(&p);
1760
    if (av_strstart(p, "http://", NULL) ||
1761
        av_strstart(p, "rtsp://", NULL))
1762
        return AVPROBE_SCORE_MAX;
1763
    return 0;
1764
}
1765

    
1766
static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1767
{
1768
    char buf[4096], *q;
1769
    int c;
1770
    AVFormatContext *ic = NULL;
1771
    ByteIOContext *f = s->pb;
1772

    
1773
    /* parse each URL and try to open it */
1774
    c = url_fgetc(f);
1775
    while (c != URL_EOF) {
1776
        /* skip spaces */
1777
        for(;;) {
1778
            if (!redir_isspace(c))
1779
                break;
1780
            c = url_fgetc(f);
1781
        }
1782
        if (c == URL_EOF)
1783
            break;
1784
        /* record url */
1785
        q = buf;
1786
        for(;;) {
1787
            if (c == URL_EOF || redir_isspace(c))
1788
                break;
1789
            if ((q - buf) < sizeof(buf) - 1)
1790
                *q++ = c;
1791
            c = url_fgetc(f);
1792
        }
1793
        *q = '\0';
1794
        //printf("URL='%s'\n", buf);
1795
        /* try to open the media file */
1796
        if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1797
            break;
1798
    }
1799
    if (!ic)
1800
        return AVERROR(EIO);
1801

    
1802
    *s = *ic;
1803
    url_fclose(f);
1804

    
1805
    return 0;
1806
}
1807

    
1808
AVInputFormat redir_demuxer = {
1809
    "redir",
1810
    NULL_IF_CONFIG_SMALL("Redirector format"),
1811
    0,
1812
    redir_probe,
1813
    redir_read_header,
1814
    NULL,
1815
    NULL,
1816
};
1817
#endif