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ffmpeg / libavformat / rtsp.c @ b316aa1a

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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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 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21
#include "avformat.h"
22

    
23
#include <sys/time.h>
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#include <unistd.h> /* for select() prototype */
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#include "network.h"
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#include "avstring.h"
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#include "rtsp.h"
28

    
29
#include "rtp_internal.h"
30

    
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//#define DEBUG
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//#define DEBUG_RTP_TCP
33

    
34
enum RTSPClientState {
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    RTSP_STATE_IDLE,
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    RTSP_STATE_PLAYING,
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    RTSP_STATE_PAUSED,
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};
39

    
40
typedef struct RTSPState {
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    URLContext *rtsp_hd; /* RTSP TCP connexion handle */
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    int nb_rtsp_streams;
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    struct RTSPStream **rtsp_streams;
44

    
45
    enum RTSPClientState state;
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    int64_t seek_timestamp;
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    /* XXX: currently we use unbuffered input */
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    //    ByteIOContext rtsp_gb;
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    int seq;        /* RTSP command sequence number */
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    char session_id[512];
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    enum RTSPProtocol protocol;
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    char last_reply[2048]; /* XXX: allocate ? */
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    RTPDemuxContext *cur_rtp;
55
} RTSPState;
56

    
57
typedef struct RTSPStream {
58
    URLContext *rtp_handle; /* RTP stream handle */
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    RTPDemuxContext *rtp_ctx; /* RTP parse context */
60

    
61
    int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
62
    int interleaved_min, interleaved_max;  /* interleave ids, if TCP transport */
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    char control_url[1024]; /* url for this stream (from SDP) */
64

    
65
    int sdp_port; /* port (from SDP content - not used in RTSP) */
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    struct in_addr sdp_ip; /* IP address  (from SDP content - not used in RTSP) */
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    int sdp_ttl;  /* IP TTL (from SDP content - not used in RTSP) */
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    int sdp_payload_type; /* payload type - only used in SDP */
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    rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
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71
    RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
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    void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
73
} RTSPStream;
74

    
75
static int rtsp_read_play(AVFormatContext *s);
76

    
77
/* XXX: currently, the only way to change the protocols consists in
78
   changing this variable */
79

    
80
int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
81

    
82
static int rtsp_probe(AVProbeData *p)
83
{
84
    if (av_strstart(p->filename, "rtsp:", NULL))
85
        return AVPROBE_SCORE_MAX;
86
    return 0;
87
}
88

    
89
static int redir_isspace(int c)
90
{
91
    return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
92
}
93

    
94
static void skip_spaces(const char **pp)
95
{
96
    const char *p;
97
    p = *pp;
98
    while (redir_isspace(*p))
99
        p++;
100
    *pp = p;
101
}
102

    
103
static void get_word_sep(char *buf, int buf_size, const char *sep,
104
                         const char **pp)
105
{
106
    const char *p;
107
    char *q;
108

    
109
    p = *pp;
110
    if (*p == '/')
111
        p++;
112
    skip_spaces(&p);
113
    q = buf;
114
    while (!strchr(sep, *p) && *p != '\0') {
115
        if ((q - buf) < buf_size - 1)
116
            *q++ = *p;
117
        p++;
118
    }
119
    if (buf_size > 0)
120
        *q = '\0';
121
    *pp = p;
122
}
123

    
124
static void get_word(char *buf, int buf_size, const char **pp)
125
{
126
    const char *p;
127
    char *q;
128

    
129
    p = *pp;
130
    skip_spaces(&p);
131
    q = buf;
132
    while (!redir_isspace(*p) && *p != '\0') {
133
        if ((q - buf) < buf_size - 1)
134
            *q++ = *p;
135
        p++;
136
    }
137
    if (buf_size > 0)
138
        *q = '\0';
139
    *pp = p;
140
}
141

    
142
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
143
   params>] */
144
static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
145
{
146
    char buf[256];
147
    int i;
148
    AVCodec *c;
149
    const char *c_name;
150

    
151
    /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
152
       see if we can handle this kind of payload */
153
    get_word_sep(buf, sizeof(buf), "/", &p);
154
    if (payload_type >= RTP_PT_PRIVATE) {
155
        RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
156
        while(handler) {
157
            if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
158
                codec->codec_id = handler->codec_id;
159
                rtsp_st->dynamic_handler= handler;
160
                if(handler->open) {
161
                    rtsp_st->dynamic_protocol_context= handler->open();
162
                }
163
                break;
164
            }
165
            handler= handler->next;
166
        }
167
    } else {
168
        /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
169
        /* search into AVRtpPayloadTypes[] */
170
        for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
171
            if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec->codec_type == AVRtpPayloadTypes[i].codec_type)){
172
                codec->codec_id = AVRtpPayloadTypes[i].codec_id;
173
                break;
174
            }
175
    }
176

    
177
    c = avcodec_find_decoder(codec->codec_id);
178
    if (c && c->name)
179
        c_name = c->name;
180
    else
181
        c_name = (char *)NULL;
182

    
183
    if (c_name) {
184
        get_word_sep(buf, sizeof(buf), "/", &p);
185
        i = atoi(buf);
186
        switch (codec->codec_type) {
187
            case CODEC_TYPE_AUDIO:
188
                av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
189
                codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
190
                codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
191
                if (i > 0) {
192
                    codec->sample_rate = i;
193
                    get_word_sep(buf, sizeof(buf), "/", &p);
194
                    i = atoi(buf);
195
                    if (i > 0)
196
                        codec->channels = i;
197
                    // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
198
                    //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
199
                }
200
                av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
201
                av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
202
                break;
203
            case CODEC_TYPE_VIDEO:
204
                av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
205
                break;
206
            default:
207
                break;
208
        }
209
        return 0;
210
    }
211

    
212
    return -1;
213
}
214

    
215
/* return the length and optionnaly the data */
216
static int hex_to_data(uint8_t *data, const char *p)
217
{
218
    int c, len, v;
219

    
220
    len = 0;
221
    v = 1;
222
    for(;;) {
223
        skip_spaces(&p);
224
        if (p == '\0')
225
            break;
226
        c = toupper((unsigned char)*p++);
227
        if (c >= '0' && c <= '9')
228
            c = c - '0';
229
        else if (c >= 'A' && c <= 'F')
230
            c = c - 'A' + 10;
231
        else
232
            break;
233
        v = (v << 4) | c;
234
        if (v & 0x100) {
235
            if (data)
236
                data[len] = v;
237
            len++;
238
            v = 1;
239
        }
240
    }
241
    return len;
242
}
243

    
244
static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
245
{
246
    switch (codec->codec_id) {
247
        case CODEC_ID_MPEG4:
248
        case CODEC_ID_AAC:
249
            if (!strcmp(attr, "config")) {
250
                /* decode the hexa encoded parameter */
251
                int len = hex_to_data(NULL, value);
252
                codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
253
                if (!codec->extradata)
254
                    return;
255
                codec->extradata_size = len;
256
                hex_to_data(codec->extradata, value);
257
            }
258
            break;
259
        default:
260
            break;
261
    }
262
    return;
263
}
264

    
265
typedef struct attrname_map
266
{
267
    const char *str;
268
    uint16_t type;
269
    uint32_t offset;
270
} attrname_map_t;
271

    
272
/* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
273
#define ATTR_NAME_TYPE_INT 0
274
#define ATTR_NAME_TYPE_STR 1
275
static attrname_map_t attr_names[]=
276
{
277
    {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
278
    {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
279
    {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
280
    {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
281
    {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
282
    {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
283
    {NULL, -1, -1},
284
};
285

    
286
/** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
287
* because it is used in rtp_h264.c, which is forthcoming.
288
*/
289
int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
290
{
291
    skip_spaces(p);
292
    if(**p)
293
    {
294
        get_word_sep(attr, attr_size, "=", p);
295
        if (**p == '=')
296
            (*p)++;
297
        get_word_sep(value, value_size, ";", p);
298
        if (**p == ';')
299
            (*p)++;
300
        return 1;
301
    }
302
    return 0;
303
}
304

    
305
/* parse a SDP line and save stream attributes */
306
static void sdp_parse_fmtp(AVStream *st, const char *p)
307
{
308
    char attr[256];
309
    char value[4096];
310
    int i;
311

    
312
    RTSPStream *rtsp_st = st->priv_data;
313
    AVCodecContext *codec = st->codec;
314
    rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
315

    
316
    /* loop on each attribute */
317
    while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
318
    {
319
        /* grab the codec extra_data from the config parameter of the fmtp line */
320
        sdp_parse_fmtp_config(codec, attr, value);
321
        /* Looking for a known attribute */
322
        for (i = 0; attr_names[i].str; ++i) {
323
            if (!strcasecmp(attr, attr_names[i].str)) {
324
                if (attr_names[i].type == ATTR_NAME_TYPE_INT)
325
                    *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
326
                else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
327
                    *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
328
            }
329
        }
330
    }
331
}
332

    
333
/** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
334
 *  and end time.
335
 *  Used for seeking in the rtp stream.
336
 */
337
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
338
{
339
    char buf[256];
340

    
341
    skip_spaces(&p);
342
    if (!av_stristart(p, "npt=", &p))
343
        return;
344

    
345
    *start = AV_NOPTS_VALUE;
346
    *end = AV_NOPTS_VALUE;
347

    
348
    get_word_sep(buf, sizeof(buf), "-", &p);
349
    *start = parse_date(buf, 1);
350
    if (*p == '-') {
351
        p++;
352
        get_word_sep(buf, sizeof(buf), "-", &p);
353
        *end = parse_date(buf, 1);
354
    }
355
//    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
356
//    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
357
}
358

    
359
typedef struct SDPParseState {
360
    /* SDP only */
361
    struct in_addr default_ip;
362
    int default_ttl;
363
} SDPParseState;
364

    
365
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
366
                           int letter, const char *buf)
367
{
368
    RTSPState *rt = s->priv_data;
369
    char buf1[64], st_type[64];
370
    const char *p;
371
    int codec_type, payload_type, i;
372
    AVStream *st;
373
    RTSPStream *rtsp_st;
374
    struct in_addr sdp_ip;
375
    int ttl;
376

    
377
#ifdef DEBUG
378
    printf("sdp: %c='%s'\n", letter, buf);
379
#endif
380

    
381
    p = buf;
382
    switch(letter) {
383
    case 'c':
384
        get_word(buf1, sizeof(buf1), &p);
385
        if (strcmp(buf1, "IN") != 0)
386
            return;
387
        get_word(buf1, sizeof(buf1), &p);
388
        if (strcmp(buf1, "IP4") != 0)
389
            return;
390
        get_word_sep(buf1, sizeof(buf1), "/", &p);
391
        if (inet_aton(buf1, &sdp_ip) == 0)
392
            return;
393
        ttl = 16;
394
        if (*p == '/') {
395
            p++;
396
            get_word_sep(buf1, sizeof(buf1), "/", &p);
397
            ttl = atoi(buf1);
398
        }
399
        if (s->nb_streams == 0) {
400
            s1->default_ip = sdp_ip;
401
            s1->default_ttl = ttl;
402
        } else {
403
            st = s->streams[s->nb_streams - 1];
404
            rtsp_st = st->priv_data;
405
            rtsp_st->sdp_ip = sdp_ip;
406
            rtsp_st->sdp_ttl = ttl;
407
        }
408
        break;
409
    case 's':
410
        av_strlcpy(s->title, p, sizeof(s->title));
411
        break;
412
    case 'i':
413
        if (s->nb_streams == 0) {
414
            av_strlcpy(s->comment, p, sizeof(s->comment));
415
            break;
416
        }
417
        break;
418
    case 'm':
419
        /* new stream */
420
        get_word(st_type, sizeof(st_type), &p);
421
        if (!strcmp(st_type, "audio")) {
422
            codec_type = CODEC_TYPE_AUDIO;
423
        } else if (!strcmp(st_type, "video")) {
424
            codec_type = CODEC_TYPE_VIDEO;
425
        } else {
426
            return;
427
        }
428
        rtsp_st = av_mallocz(sizeof(RTSPStream));
429
        if (!rtsp_st)
430
            return;
431
        rtsp_st->stream_index = -1;
432
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
433

    
434
        rtsp_st->sdp_ip = s1->default_ip;
435
        rtsp_st->sdp_ttl = s1->default_ttl;
436

    
437
        get_word(buf1, sizeof(buf1), &p); /* port */
438
        rtsp_st->sdp_port = atoi(buf1);
439

    
440
        get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
441

    
442
        /* XXX: handle list of formats */
443
        get_word(buf1, sizeof(buf1), &p); /* format list */
444
        rtsp_st->sdp_payload_type = atoi(buf1);
445

    
446
        if (!strcmp(AVRtpPayloadTypes[rtsp_st->sdp_payload_type].enc_name, "MP2T")) {
447
            /* no corresponding stream */
448
        } else {
449
            st = av_new_stream(s, 0);
450
            if (!st)
451
                return;
452
            st->priv_data = rtsp_st;
453
            rtsp_st->stream_index = st->index;
454
            st->codec->codec_type = codec_type;
455
            if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
456
                /* if standard payload type, we can find the codec right now */
457
                rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
458
            }
459
        }
460
        /* put a default control url */
461
        av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
462
        break;
463
    case 'a':
464
        if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
465
            char proto[32];
466
            /* get the control url */
467
            st = s->streams[s->nb_streams - 1];
468
            rtsp_st = st->priv_data;
469

    
470
            /* XXX: may need to add full url resolution */
471
            url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
472
            if (proto[0] == '\0') {
473
                /* relative control URL */
474
                av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
475
                av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
476
            } else {
477
                av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
478
            }
479
        } else if (av_strstart(p, "rtpmap:", &p)) {
480
            /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
481
            get_word(buf1, sizeof(buf1), &p);
482
            payload_type = atoi(buf1);
483
            for(i = 0; i < s->nb_streams;i++) {
484
                st = s->streams[i];
485
                rtsp_st = st->priv_data;
486
                if (rtsp_st->sdp_payload_type == payload_type) {
487
                    sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
488
                }
489
            }
490
        } else if (av_strstart(p, "fmtp:", &p)) {
491
            /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
492
            get_word(buf1, sizeof(buf1), &p);
493
            payload_type = atoi(buf1);
494
            for(i = 0; i < s->nb_streams;i++) {
495
                st = s->streams[i];
496
                rtsp_st = st->priv_data;
497
                if (rtsp_st->sdp_payload_type == payload_type) {
498
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
499
                        if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
500
                            sdp_parse_fmtp(st, p);
501
                        }
502
                    } else {
503
                        sdp_parse_fmtp(st, p);
504
                    }
505
                }
506
            }
507
        } else if(av_strstart(p, "framesize:", &p)) {
508
            // let dynamic protocol handlers have a stab at the line.
509
            get_word(buf1, sizeof(buf1), &p);
510
            payload_type = atoi(buf1);
511
            for(i = 0; i < s->nb_streams;i++) {
512
                st = s->streams[i];
513
                rtsp_st = st->priv_data;
514
                if (rtsp_st->sdp_payload_type == payload_type) {
515
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
516
                        rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
517
                    }
518
                }
519
            }
520
        } else if(av_strstart(p, "range:", &p)) {
521
            int64_t start, end;
522

    
523
            // this is so that seeking on a streamed file can work.
524
            rtsp_parse_range_npt(p, &start, &end);
525
            s->start_time= start;
526
            s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
527
        }
528
        break;
529
    }
530
}
531

    
532
static int sdp_parse(AVFormatContext *s, const char *content)
533
{
534
    const char *p;
535
    int letter;
536
    char buf[1024], *q;
537
    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
538

    
539
    memset(s1, 0, sizeof(SDPParseState));
540
    p = content;
541
    for(;;) {
542
        skip_spaces(&p);
543
        letter = *p;
544
        if (letter == '\0')
545
            break;
546
        p++;
547
        if (*p != '=')
548
            goto next_line;
549
        p++;
550
        /* get the content */
551
        q = buf;
552
        while (*p != '\n' && *p != '\r' && *p != '\0') {
553
            if ((q - buf) < sizeof(buf) - 1)
554
                *q++ = *p;
555
            p++;
556
        }
557
        *q = '\0';
558
        sdp_parse_line(s, s1, letter, buf);
559
    next_line:
560
        while (*p != '\n' && *p != '\0')
561
            p++;
562
        if (*p == '\n')
563
            p++;
564
    }
565
    return 0;
566
}
567

    
568
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
569
{
570
    const char *p;
571
    int v;
572

    
573
    p = *pp;
574
    skip_spaces(&p);
575
    v = strtol(p, (char **)&p, 10);
576
    if (*p == '-') {
577
        p++;
578
        *min_ptr = v;
579
        v = strtol(p, (char **)&p, 10);
580
        *max_ptr = v;
581
    } else {
582
        *min_ptr = v;
583
        *max_ptr = v;
584
    }
585
    *pp = p;
586
}
587

    
588
/* XXX: only one transport specification is parsed */
589
static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
590
{
591
    char transport_protocol[16];
592
    char profile[16];
593
    char lower_transport[16];
594
    char parameter[16];
595
    RTSPTransportField *th;
596
    char buf[256];
597

    
598
    reply->nb_transports = 0;
599

    
600
    for(;;) {
601
        skip_spaces(&p);
602
        if (*p == '\0')
603
            break;
604

    
605
        th = &reply->transports[reply->nb_transports];
606

    
607
        get_word_sep(transport_protocol, sizeof(transport_protocol),
608
                     "/", &p);
609
        if (*p == '/')
610
            p++;
611
        get_word_sep(profile, sizeof(profile), "/;,", &p);
612
        lower_transport[0] = '\0';
613
        if (*p == '/') {
614
            p++;
615
            get_word_sep(lower_transport, sizeof(lower_transport),
616
                         ";,", &p);
617
        }
618
        if (!strcasecmp(lower_transport, "TCP"))
619
            th->protocol = RTSP_PROTOCOL_RTP_TCP;
620
        else
621
            th->protocol = RTSP_PROTOCOL_RTP_UDP;
622

    
623
        if (*p == ';')
624
            p++;
625
        /* get each parameter */
626
        while (*p != '\0' && *p != ',') {
627
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
628
            if (!strcmp(parameter, "port")) {
629
                if (*p == '=') {
630
                    p++;
631
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
632
                }
633
            } else if (!strcmp(parameter, "client_port")) {
634
                if (*p == '=') {
635
                    p++;
636
                    rtsp_parse_range(&th->client_port_min,
637
                                     &th->client_port_max, &p);
638
                }
639
            } else if (!strcmp(parameter, "server_port")) {
640
                if (*p == '=') {
641
                    p++;
642
                    rtsp_parse_range(&th->server_port_min,
643
                                     &th->server_port_max, &p);
644
                }
645
            } else if (!strcmp(parameter, "interleaved")) {
646
                if (*p == '=') {
647
                    p++;
648
                    rtsp_parse_range(&th->interleaved_min,
649
                                     &th->interleaved_max, &p);
650
                }
651
            } else if (!strcmp(parameter, "multicast")) {
652
                if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
653
                    th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
654
            } else if (!strcmp(parameter, "ttl")) {
655
                if (*p == '=') {
656
                    p++;
657
                    th->ttl = strtol(p, (char **)&p, 10);
658
                }
659
            } else if (!strcmp(parameter, "destination")) {
660
                struct in_addr ipaddr;
661

    
662
                if (*p == '=') {
663
                    p++;
664
                    get_word_sep(buf, sizeof(buf), ";,", &p);
665
                    if (inet_aton(buf, &ipaddr))
666
                        th->destination = ntohl(ipaddr.s_addr);
667
                }
668
            }
669
            while (*p != ';' && *p != '\0' && *p != ',')
670
                p++;
671
            if (*p == ';')
672
                p++;
673
        }
674
        if (*p == ',')
675
            p++;
676

    
677
        reply->nb_transports++;
678
    }
679
}
680

    
681
void rtsp_parse_line(RTSPHeader *reply, const char *buf)
682
{
683
    const char *p;
684

    
685
    /* NOTE: we do case independent match for broken servers */
686
    p = buf;
687
    if (av_stristart(p, "Session:", &p)) {
688
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
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
    }
698
}
699

    
700
static int url_readbuf(URLContext *h, unsigned char *buf, int size)
701
{
702
    int ret, len;
703

    
704
    len = 0;
705
    while (len < size) {
706
        ret = url_read(h, buf+len, size-len);
707
        if (ret < 1)
708
            return ret;
709
        len += ret;
710
    }
711
    return len;
712
}
713

    
714
/* skip a RTP/TCP interleaved packet */
715
static void rtsp_skip_packet(AVFormatContext *s)
716
{
717
    RTSPState *rt = s->priv_data;
718
    int ret, len, len1;
719
    uint8_t buf[1024];
720

    
721
    ret = url_readbuf(rt->rtsp_hd, buf, 3);
722
    if (ret != 3)
723
        return;
724
    len = AV_RB16(buf + 1);
725
#ifdef DEBUG
726
    printf("skipping RTP packet len=%d\n", len);
727
#endif
728
    /* skip payload */
729
    while (len > 0) {
730
        len1 = len;
731
        if (len1 > sizeof(buf))
732
            len1 = sizeof(buf);
733
        ret = url_readbuf(rt->rtsp_hd, buf, len1);
734
        if (ret != len1)
735
            return;
736
        len -= len1;
737
    }
738
}
739

    
740
static void rtsp_send_cmd(AVFormatContext *s,
741
                          const char *cmd, RTSPHeader *reply,
742
                          unsigned char **content_ptr)
743
{
744
    RTSPState *rt = s->priv_data;
745
    char buf[4096], buf1[1024], *q;
746
    unsigned char ch;
747
    const char *p;
748
    int content_length, line_count;
749
    unsigned char *content = NULL;
750

    
751
    memset(reply, 0, sizeof(RTSPHeader));
752

    
753
    rt->seq++;
754
    av_strlcpy(buf, cmd, sizeof(buf));
755
    snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
756
    av_strlcat(buf, buf1, sizeof(buf));
757
    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
758
        snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
759
        av_strlcat(buf, buf1, sizeof(buf));
760
    }
761
    av_strlcat(buf, "\r\n", sizeof(buf));
762
#ifdef DEBUG
763
    printf("Sending:\n%s--\n", buf);
764
#endif
765
    url_write(rt->rtsp_hd, buf, strlen(buf));
766

    
767
    /* parse reply (XXX: use buffers) */
768
    line_count = 0;
769
    rt->last_reply[0] = '\0';
770
    for(;;) {
771
        q = buf;
772
        for(;;) {
773
            if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
774
                break;
775
            if (ch == '\n')
776
                break;
777
            if (ch == '$') {
778
                /* XXX: only parse it if first char on line ? */
779
                rtsp_skip_packet(s);
780
            } else if (ch != '\r') {
781
                if ((q - buf) < sizeof(buf) - 1)
782
                    *q++ = ch;
783
            }
784
        }
785
        *q = '\0';
786
#ifdef DEBUG
787
        printf("line='%s'\n", buf);
788
#endif
789
        /* test if last line */
790
        if (buf[0] == '\0')
791
            break;
792
        p = buf;
793
        if (line_count == 0) {
794
            /* get reply code */
795
            get_word(buf1, sizeof(buf1), &p);
796
            get_word(buf1, sizeof(buf1), &p);
797
            reply->status_code = atoi(buf1);
798
        } else {
799
            rtsp_parse_line(reply, p);
800
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
801
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
802
        }
803
        line_count++;
804
    }
805

    
806
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
807
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
808

    
809
    content_length = reply->content_length;
810
    if (content_length > 0) {
811
        /* leave some room for a trailing '\0' (useful for simple parsing) */
812
        content = av_malloc(content_length + 1);
813
        (void)url_readbuf(rt->rtsp_hd, content, content_length);
814
        content[content_length] = '\0';
815
    }
816
    if (content_ptr)
817
        *content_ptr = content;
818
    else
819
        av_free(content);
820
}
821

    
822

    
823
/* close and free RTSP streams */
824
static void rtsp_close_streams(RTSPState *rt)
825
{
826
    int i;
827
    RTSPStream *rtsp_st;
828

    
829
    for(i=0;i<rt->nb_rtsp_streams;i++) {
830
        rtsp_st = rt->rtsp_streams[i];
831
        if (rtsp_st) {
832
            if (rtsp_st->rtp_ctx)
833
                rtp_parse_close(rtsp_st->rtp_ctx);
834
            if (rtsp_st->rtp_handle)
835
                url_close(rtsp_st->rtp_handle);
836
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
837
                rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
838
        }
839
        av_free(rtsp_st);
840
    }
841
    av_free(rt->rtsp_streams);
842
}
843

    
844
static int rtsp_read_header(AVFormatContext *s,
845
                            AVFormatParameters *ap)
846
{
847
    RTSPState *rt = s->priv_data;
848
    char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
849
    URLContext *rtsp_hd;
850
    int port, i, j, ret, err;
851
    RTSPHeader reply1, *reply = &reply1;
852
    unsigned char *content = NULL;
853
    RTSPStream *rtsp_st;
854
    int protocol_mask = 0;
855
    AVStream *st;
856

    
857
    /* extract hostname and port */
858
    url_split(NULL, 0, NULL, 0,
859
              host, sizeof(host), &port, path, sizeof(path), s->filename);
860
    if (port < 0)
861
        port = RTSP_DEFAULT_PORT;
862

    
863
    /* search for options */
864
    option_list = strchr(path, '?');
865
    if (option_list) {
866
        /* remove the options from the path */
867
        *option_list++ = 0;
868
        while(option_list) {
869
            /* move the option pointer */
870
            option = option_list;
871
            option_list = strchr(option_list, '&');
872
            if (option_list)
873
                *(option_list++) = 0;
874
            /* handle the options */
875
            if (strcmp(option, "udp") == 0)
876
                protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
877
            else if (strcmp(option, "multicast") == 0)
878
                protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
879
            else if (strcmp(option, "tcp") == 0)
880
                protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
881
        }
882
    }
883

    
884
    if (!protocol_mask)
885
        protocol_mask = rtsp_default_protocols;
886

    
887
    /* open the tcp connexion */
888
    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
889
    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
890
        return AVERROR(EIO);
891
    rt->rtsp_hd = rtsp_hd;
892
    rt->seq = 0;
893

    
894
    /* describe the stream */
895
    snprintf(cmd, sizeof(cmd),
896
             "DESCRIBE %s RTSP/1.0\r\n"
897
             "Accept: application/sdp\r\n",
898
             s->filename);
899
    rtsp_send_cmd(s, cmd, reply, &content);
900
    if (!content) {
901
        err = AVERROR_INVALIDDATA;
902
        goto fail;
903
    }
904
    if (reply->status_code != RTSP_STATUS_OK) {
905
        err = AVERROR_INVALIDDATA;
906
        goto fail;
907
    }
908

    
909
    /* now we got the SDP description, we parse it */
910
    ret = sdp_parse(s, (const char *)content);
911
    av_freep(&content);
912
    if (ret < 0) {
913
        err = AVERROR_INVALIDDATA;
914
        goto fail;
915
    }
916

    
917
    /* for each stream, make the setup request */
918
    /* XXX: we assume the same server is used for the control of each
919
       RTSP stream */
920

    
921
    for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
922
        char transport[2048];
923

    
924
        rtsp_st = rt->rtsp_streams[i];
925

    
926
        /* compute available transports */
927
        transport[0] = '\0';
928

    
929
        /* RTP/UDP */
930
        if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
931
            char buf[256];
932

    
933
            /* first try in specified port range */
934
            if (RTSP_RTP_PORT_MIN != 0) {
935
                while(j <= RTSP_RTP_PORT_MAX) {
936
                    snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
937
                    j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
938
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
939
                        goto rtp_opened;
940
                    }
941
                }
942
            }
943

    
944
/*            then try on any port
945
**            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
946
**                err = AVERROR_INVALIDDATA;
947
**                goto fail;
948
**            }
949
*/
950

    
951
        rtp_opened:
952
            port = rtp_get_local_port(rtsp_st->rtp_handle);
953
            if (transport[0] != '\0')
954
                av_strlcat(transport, ",", sizeof(transport));
955
            snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
956
                     "RTP/AVP/UDP;unicast;client_port=%d-%d",
957
                     port, port + 1);
958
        }
959

    
960
        /* RTP/TCP */
961
        else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
962
            if (transport[0] != '\0')
963
                av_strlcat(transport, ",", sizeof(transport));
964
            snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
965
                     "RTP/AVP/TCP");
966
        }
967

    
968
        else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
969
            if (transport[0] != '\0')
970
                av_strlcat(transport, ",", sizeof(transport));
971
            snprintf(transport + strlen(transport),
972
                     sizeof(transport) - strlen(transport) - 1,
973
                     "RTP/AVP/UDP;multicast");
974
        }
975
        snprintf(cmd, sizeof(cmd),
976
                 "SETUP %s RTSP/1.0\r\n"
977
                 "Transport: %s\r\n",
978
                 rtsp_st->control_url, transport);
979
        rtsp_send_cmd(s, cmd, reply, NULL);
980
        if (reply->status_code != RTSP_STATUS_OK ||
981
            reply->nb_transports != 1) {
982
            err = AVERROR_INVALIDDATA;
983
            goto fail;
984
        }
985

    
986
        /* XXX: same protocol for all streams is required */
987
        if (i > 0) {
988
            if (reply->transports[0].protocol != rt->protocol) {
989
                err = AVERROR_INVALIDDATA;
990
                goto fail;
991
            }
992
        } else {
993
            rt->protocol = reply->transports[0].protocol;
994
        }
995

    
996
        /* close RTP connection if not choosen */
997
        if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
998
            (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
999
            url_close(rtsp_st->rtp_handle);
1000
            rtsp_st->rtp_handle = NULL;
1001
        }
1002

    
1003
        switch(reply->transports[0].protocol) {
1004
        case RTSP_PROTOCOL_RTP_TCP:
1005
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1006
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1007
            break;
1008

    
1009
        case RTSP_PROTOCOL_RTP_UDP:
1010
            {
1011
                char url[1024];
1012

    
1013
                /* XXX: also use address if specified */
1014
                snprintf(url, sizeof(url), "rtp://%s:%d",
1015
                         host, reply->transports[0].server_port_min);
1016
                if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1017
                    err = AVERROR_INVALIDDATA;
1018
                    goto fail;
1019
                }
1020
            }
1021
            break;
1022
        case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1023
            {
1024
                char url[1024];
1025
                struct in_addr in;
1026

    
1027
                in.s_addr = htonl(reply->transports[0].destination);
1028
                snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1029
                         inet_ntoa(in),
1030
                         reply->transports[0].port_min,
1031
                         reply->transports[0].ttl);
1032
                if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1033
                    err = AVERROR_INVALIDDATA;
1034
                    goto fail;
1035
                }
1036
            }
1037
            break;
1038
        }
1039
        /* open the RTP context */
1040
        st = NULL;
1041
        if (rtsp_st->stream_index >= 0)
1042
            st = s->streams[rtsp_st->stream_index];
1043
        if (!st)
1044
            s->ctx_flags |= AVFMTCTX_NOHEADER;
1045
        rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1046

    
1047
        if (!rtsp_st->rtp_ctx) {
1048
            err = AVERROR(ENOMEM);
1049
            goto fail;
1050
        } else {
1051
            if(rtsp_st->dynamic_handler) {
1052
                rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1053
                rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1054
            }
1055
        }
1056
    }
1057

    
1058
    rt->state = RTSP_STATE_IDLE;
1059
    rt->seek_timestamp = 0; /* default is to start stream at position
1060
                               zero */
1061
    if (ap->initial_pause) {
1062
        /* do not start immediately */
1063
    } else {
1064
        if (rtsp_read_play(s) < 0) {
1065
            err = AVERROR_INVALIDDATA;
1066
            goto fail;
1067
        }
1068
    }
1069
    return 0;
1070
 fail:
1071
    rtsp_close_streams(rt);
1072
    av_freep(&content);
1073
    url_close(rt->rtsp_hd);
1074
    return err;
1075
}
1076

    
1077
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1078
                           uint8_t *buf, int buf_size)
1079
{
1080
    RTSPState *rt = s->priv_data;
1081
    int id, len, i, ret;
1082
    RTSPStream *rtsp_st;
1083

    
1084
#ifdef DEBUG_RTP_TCP
1085
    printf("tcp_read_packet:\n");
1086
#endif
1087
 redo:
1088
    for(;;) {
1089
        ret = url_readbuf(rt->rtsp_hd, buf, 1);
1090
#ifdef DEBUG_RTP_TCP
1091
        printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1092
#endif
1093
        if (ret != 1)
1094
            return -1;
1095
        if (buf[0] == '$')
1096
            break;
1097
    }
1098
    ret = url_readbuf(rt->rtsp_hd, buf, 3);
1099
    if (ret != 3)
1100
        return -1;
1101
    id = buf[0];
1102
    len = AV_RB16(buf + 1);
1103
#ifdef DEBUG_RTP_TCP
1104
    printf("id=%d len=%d\n", id, len);
1105
#endif
1106
    if (len > buf_size || len < 12)
1107
        goto redo;
1108
    /* get the data */
1109
    ret = url_readbuf(rt->rtsp_hd, buf, len);
1110
    if (ret != len)
1111
        return -1;
1112

    
1113
    /* find the matching stream */
1114
    for(i = 0; i < rt->nb_rtsp_streams; i++) {
1115
        rtsp_st = rt->rtsp_streams[i];
1116
        if (id >= rtsp_st->interleaved_min &&
1117
            id <= rtsp_st->interleaved_max)
1118
            goto found;
1119
    }
1120
    goto redo;
1121
 found:
1122
    *prtsp_st = rtsp_st;
1123
    return len;
1124
}
1125

    
1126
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1127
                           uint8_t *buf, int buf_size)
1128
{
1129
    RTSPState *rt = s->priv_data;
1130
    RTSPStream *rtsp_st;
1131
    fd_set rfds;
1132
    int fd1, fd2, fd_max, n, i, ret;
1133
    struct timeval tv;
1134

    
1135
    for(;;) {
1136
        if (url_interrupt_cb())
1137
            return -1;
1138
        FD_ZERO(&rfds);
1139
        fd_max = -1;
1140
        for(i = 0; i < rt->nb_rtsp_streams; i++) {
1141
            rtsp_st = rt->rtsp_streams[i];
1142
            /* currently, we cannot probe RTCP handle because of blocking restrictions */
1143
            rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1144
            if (fd1 > fd_max)
1145
                fd_max = fd1;
1146
            FD_SET(fd1, &rfds);
1147
        }
1148
        tv.tv_sec = 0;
1149
        tv.tv_usec = 100 * 1000;
1150
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1151
        if (n > 0) {
1152
            for(i = 0; i < rt->nb_rtsp_streams; i++) {
1153
                rtsp_st = rt->rtsp_streams[i];
1154
                rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1155
                if (FD_ISSET(fd1, &rfds)) {
1156
                    ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1157
                    if (ret > 0) {
1158
                        *prtsp_st = rtsp_st;
1159
                        return ret;
1160
                    }
1161
                }
1162
            }
1163
        }
1164
    }
1165
}
1166

    
1167
static int rtsp_read_packet(AVFormatContext *s,
1168
                            AVPacket *pkt)
1169
{
1170
    RTSPState *rt = s->priv_data;
1171
    RTSPStream *rtsp_st;
1172
    int ret, len;
1173
    uint8_t buf[RTP_MAX_PACKET_LENGTH];
1174

    
1175
    /* get next frames from the same RTP packet */
1176
    if (rt->cur_rtp) {
1177
        ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1178
        if (ret == 0) {
1179
            rt->cur_rtp = NULL;
1180
            return 0;
1181
        } else if (ret == 1) {
1182
            return 0;
1183
        } else {
1184
            rt->cur_rtp = NULL;
1185
        }
1186
    }
1187

    
1188
    /* read next RTP packet */
1189
 redo:
1190
    switch(rt->protocol) {
1191
    default:
1192
    case RTSP_PROTOCOL_RTP_TCP:
1193
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1194
        break;
1195
    case RTSP_PROTOCOL_RTP_UDP:
1196
    case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1197
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1198
        if (len >=0 && rtsp_st->rtp_ctx)
1199
            rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1200
        break;
1201
    }
1202
    if (len < 0)
1203
        return AVERROR(EIO);
1204
    ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1205
    if (ret < 0)
1206
        goto redo;
1207
    if (ret == 1) {
1208
        /* more packets may follow, so we save the RTP context */
1209
        rt->cur_rtp = rtsp_st->rtp_ctx;
1210
    }
1211
    return 0;
1212
}
1213

    
1214
static int rtsp_read_play(AVFormatContext *s)
1215
{
1216
    RTSPState *rt = s->priv_data;
1217
    RTSPHeader reply1, *reply = &reply1;
1218
    char cmd[1024];
1219

    
1220
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1221

    
1222
    if (rt->state == RTSP_STATE_PAUSED) {
1223
        snprintf(cmd, sizeof(cmd),
1224
                 "PLAY %s RTSP/1.0\r\n",
1225
                 s->filename);
1226
    } else {
1227
        snprintf(cmd, sizeof(cmd),
1228
                 "PLAY %s RTSP/1.0\r\n"
1229
                 "Range: npt=%0.3f-\r\n",
1230
                 s->filename,
1231
                 (double)rt->seek_timestamp / AV_TIME_BASE);
1232
    }
1233
    rtsp_send_cmd(s, cmd, reply, NULL);
1234
    if (reply->status_code != RTSP_STATUS_OK) {
1235
        return -1;
1236
    } else {
1237
        rt->state = RTSP_STATE_PLAYING;
1238
        return 0;
1239
    }
1240
}
1241

    
1242
/* pause the stream */
1243
static int rtsp_read_pause(AVFormatContext *s)
1244
{
1245
    RTSPState *rt = s->priv_data;
1246
    RTSPHeader reply1, *reply = &reply1;
1247
    char cmd[1024];
1248

    
1249
    rt = s->priv_data;
1250

    
1251
    if (rt->state != RTSP_STATE_PLAYING)
1252
        return 0;
1253

    
1254
    snprintf(cmd, sizeof(cmd),
1255
             "PAUSE %s RTSP/1.0\r\n",
1256
             s->filename);
1257
    rtsp_send_cmd(s, cmd, reply, NULL);
1258
    if (reply->status_code != RTSP_STATUS_OK) {
1259
        return -1;
1260
    } else {
1261
        rt->state = RTSP_STATE_PAUSED;
1262
        return 0;
1263
    }
1264
}
1265

    
1266
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1267
                          int64_t timestamp, int flags)
1268
{
1269
    RTSPState *rt = s->priv_data;
1270

    
1271
    rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1272
    switch(rt->state) {
1273
    default:
1274
    case RTSP_STATE_IDLE:
1275
        break;
1276
    case RTSP_STATE_PLAYING:
1277
        if (rtsp_read_play(s) != 0)
1278
            return -1;
1279
        break;
1280
    case RTSP_STATE_PAUSED:
1281
        rt->state = RTSP_STATE_IDLE;
1282
        break;
1283
    }
1284
    return 0;
1285
}
1286

    
1287
static int rtsp_read_close(AVFormatContext *s)
1288
{
1289
    RTSPState *rt = s->priv_data;
1290
    RTSPHeader reply1, *reply = &reply1;
1291
    char cmd[1024];
1292

    
1293
#if 0
1294
    /* NOTE: it is valid to flush the buffer here */
1295
    if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1296
        url_fclose(&rt->rtsp_gb);
1297
    }
1298
#endif
1299
    snprintf(cmd, sizeof(cmd),
1300
             "TEARDOWN %s RTSP/1.0\r\n",
1301
             s->filename);
1302
    rtsp_send_cmd(s, cmd, reply, NULL);
1303

    
1304
    rtsp_close_streams(rt);
1305
    url_close(rt->rtsp_hd);
1306
    return 0;
1307
}
1308

    
1309
#ifdef CONFIG_RTSP_DEMUXER
1310
AVInputFormat rtsp_demuxer = {
1311
    "rtsp",
1312
    "RTSP input format",
1313
    sizeof(RTSPState),
1314
    rtsp_probe,
1315
    rtsp_read_header,
1316
    rtsp_read_packet,
1317
    rtsp_read_close,
1318
    rtsp_read_seek,
1319
    .flags = AVFMT_NOFILE,
1320
    .read_play = rtsp_read_play,
1321
    .read_pause = rtsp_read_pause,
1322
};
1323
#endif
1324

    
1325
static int sdp_probe(AVProbeData *p1)
1326
{
1327
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1328

    
1329
    /* we look for a line beginning "c=IN IP4" */
1330
    while (p < p_end && *p != '\0') {
1331
        if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1332
            return AVPROBE_SCORE_MAX / 2;
1333

    
1334
        while(p < p_end - 1 && *p != '\n') p++;
1335
        if (++p >= p_end)
1336
            break;
1337
        if (*p == '\r')
1338
            p++;
1339
    }
1340
    return 0;
1341
}
1342

    
1343
#define SDP_MAX_SIZE 8192
1344

    
1345
static int sdp_read_header(AVFormatContext *s,
1346
                           AVFormatParameters *ap)
1347
{
1348
    RTSPState *rt = s->priv_data;
1349
    RTSPStream *rtsp_st;
1350
    int size, i, err;
1351
    char *content;
1352
    char url[1024];
1353
    AVStream *st;
1354

    
1355
    /* read the whole sdp file */
1356
    /* XXX: better loading */
1357
    content = av_malloc(SDP_MAX_SIZE);
1358
    size = get_buffer(&s->pb, content, SDP_MAX_SIZE - 1);
1359
    if (size <= 0) {
1360
        av_free(content);
1361
        return AVERROR_INVALIDDATA;
1362
    }
1363
    content[size] ='\0';
1364

    
1365
    sdp_parse(s, content);
1366
    av_free(content);
1367

    
1368
    /* open each RTP stream */
1369
    for(i=0;i<rt->nb_rtsp_streams;i++) {
1370
        rtsp_st = rt->rtsp_streams[i];
1371

    
1372
        snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1373
                 inet_ntoa(rtsp_st->sdp_ip),
1374
                 rtsp_st->sdp_port,
1375
                 rtsp_st->sdp_ttl);
1376
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1377
            err = AVERROR_INVALIDDATA;
1378
            goto fail;
1379
        }
1380
        /* open the RTP context */
1381
        st = NULL;
1382
        if (rtsp_st->stream_index >= 0)
1383
            st = s->streams[rtsp_st->stream_index];
1384
        if (!st)
1385
            s->ctx_flags |= AVFMTCTX_NOHEADER;
1386
        rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1387
        if (!rtsp_st->rtp_ctx) {
1388
            err = AVERROR(ENOMEM);
1389
            goto fail;
1390
        } else {
1391
            if(rtsp_st->dynamic_handler) {
1392
                rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1393
                rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1394
            }
1395
        }
1396
    }
1397
    return 0;
1398
 fail:
1399
    rtsp_close_streams(rt);
1400
    return err;
1401
}
1402

    
1403
static int sdp_read_packet(AVFormatContext *s,
1404
                            AVPacket *pkt)
1405
{
1406
    return rtsp_read_packet(s, pkt);
1407
}
1408

    
1409
static int sdp_read_close(AVFormatContext *s)
1410
{
1411
    RTSPState *rt = s->priv_data;
1412
    rtsp_close_streams(rt);
1413
    return 0;
1414
}
1415

    
1416
#ifdef CONFIG_SDP_DEMUXER
1417
AVInputFormat sdp_demuxer = {
1418
    "sdp",
1419
    "SDP",
1420
    sizeof(RTSPState),
1421
    sdp_probe,
1422
    sdp_read_header,
1423
    sdp_read_packet,
1424
    sdp_read_close,
1425
};
1426
#endif
1427

    
1428
#ifdef CONFIG_REDIR_DEMUXER
1429
/* dummy redirector format (used directly in av_open_input_file now) */
1430
static int redir_probe(AVProbeData *pd)
1431
{
1432
    const char *p;
1433
    p = pd->buf;
1434
    while (redir_isspace(*p))
1435
        p++;
1436
    if (av_strstart(p, "http://", NULL) ||
1437
        av_strstart(p, "rtsp://", NULL))
1438
        return AVPROBE_SCORE_MAX;
1439
    return 0;
1440
}
1441

    
1442
/* called from utils.c */
1443
int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f)
1444
{
1445
    char buf[4096], *q;
1446
    int c;
1447
    AVFormatContext *ic = NULL;
1448

    
1449
    /* parse each URL and try to open it */
1450
    c = url_fgetc(f);
1451
    while (c != URL_EOF) {
1452
        /* skip spaces */
1453
        for(;;) {
1454
            if (!redir_isspace(c))
1455
                break;
1456
            c = url_fgetc(f);
1457
        }
1458
        if (c == URL_EOF)
1459
            break;
1460
        /* record url */
1461
        q = buf;
1462
        for(;;) {
1463
            if (c == URL_EOF || redir_isspace(c))
1464
                break;
1465
            if ((q - buf) < sizeof(buf) - 1)
1466
                *q++ = c;
1467
            c = url_fgetc(f);
1468
        }
1469
        *q = '\0';
1470
        //printf("URL='%s'\n", buf);
1471
        /* try to open the media file */
1472
        if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1473
            break;
1474
    }
1475
    *ic_ptr = ic;
1476
    if (!ic)
1477
        return AVERROR(EIO);
1478
    else
1479
        return 0;
1480
}
1481

    
1482
AVInputFormat redir_demuxer = {
1483
    "redir",
1484
    "Redirector format",
1485
    0,
1486
    redir_probe,
1487
    NULL,
1488
    NULL,
1489
    NULL,
1490
};
1491
#endif