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1
/*
2
 * RTSP/SDP client
3
 * Copyright (c) 2002 Fabrice Bellard.
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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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,
13
 * 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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 */
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#include "avformat.h"
22

    
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#include <unistd.h> /* for select() prototype */
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#include "network.h"
25

    
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#include "rtp_internal.h"
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//#define DEBUG
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//#define DEBUG_RTP_TCP
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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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};
36

    
37
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;
41

    
42
    enum RTSPClientState state;
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    int64_t seek_timestamp;
44

    
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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;
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} RTSPState;
53

    
54
typedef struct RTSPStream {
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    URLContext *rtp_handle; /* RTP stream handle */
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    RTPDemuxContext *rtp_ctx; /* RTP parse context */
57

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

    
62
    int sdp_port; /* port (from SDP content - not used in RTSP) */
63
    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 */
67

    
68
    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)
70
} RTSPStream;
71

    
72
static int rtsp_read_play(AVFormatContext *s);
73

    
74
/* XXX: currently, the only way to change the protocols consists in
75
   changing this variable */
76

    
77
int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
78

    
79
FFRTSPCallback *ff_rtsp_callback = NULL;
80

    
81
static int rtsp_probe(AVProbeData *p)
82
{
83
    if (strstart(p->filename, "rtsp:", NULL))
84
        return AVPROBE_SCORE_MAX;
85
    return 0;
86
}
87

    
88
static int redir_isspace(int c)
89
{
90
    return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
91
}
92

    
93
static void skip_spaces(const char **pp)
94
{
95
    const char *p;
96
    p = *pp;
97
    while (redir_isspace(*p))
98
        p++;
99
    *pp = p;
100
}
101

    
102
static void get_word_sep(char *buf, int buf_size, const char *sep,
103
                         const char **pp)
104
{
105
    const char *p;
106
    char *q;
107

    
108
    p = *pp;
109
    if (*p == '/')
110
        p++;
111
    skip_spaces(&p);
112
    q = buf;
113
    while (!strchr(sep, *p) && *p != '\0') {
114
        if ((q - buf) < buf_size - 1)
115
            *q++ = *p;
116
        p++;
117
    }
118
    if (buf_size > 0)
119
        *q = '\0';
120
    *pp = p;
121
}
122

    
123
static void get_word(char *buf, int buf_size, const char **pp)
124
{
125
    const char *p;
126
    char *q;
127

    
128
    p = *pp;
129
    skip_spaces(&p);
130
    q = buf;
131
    while (!redir_isspace(*p) && *p != '\0') {
132
        if ((q - buf) < buf_size - 1)
133
            *q++ = *p;
134
        p++;
135
    }
136
    if (buf_size > 0)
137
        *q = '\0';
138
    *pp = p;
139
}
140

    
141
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
142
   params>] */
143
static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
144
{
145
    char buf[256];
146
    int i;
147
    AVCodec *c;
148
    const char *c_name;
149

    
150
    /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
151
       see if we can handle this kind of payload */
152
    get_word_sep(buf, sizeof(buf), "/", &p);
153
    if (payload_type >= RTP_PT_PRIVATE) {
154
        RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
155
        while(handler) {
156
            if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
157
                codec->codec_id = handler->codec_id;
158
                rtsp_st->dynamic_handler= handler;
159
                if(handler->open) {
160
                    rtsp_st->dynamic_protocol_context= handler->open();
161
                }
162
                break;
163
            }
164
            handler= handler->next;
165
        }
166
    } else {
167
        /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
168
        /* search into AVRtpPayloadTypes[] */
169
        for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
170
            if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec->codec_type == AVRtpPayloadTypes[i].codec_type)){
171
                codec->codec_id = AVRtpPayloadTypes[i].codec_id;
172
                break;
173
            }
174
    }
175

    
176
    c = avcodec_find_decoder(codec->codec_id);
177
    if (c && c->name)
178
        c_name = c->name;
179
    else
180
        c_name = (char *)NULL;
181

    
182
    if (c_name) {
183
        get_word_sep(buf, sizeof(buf), "/", &p);
184
        i = atoi(buf);
185
        switch (codec->codec_type) {
186
            case CODEC_TYPE_AUDIO:
187
                av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
188
                codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
189
                codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
190
                if (i > 0) {
191
                    codec->sample_rate = i;
192
                    get_word_sep(buf, sizeof(buf), "/", &p);
193
                    i = atoi(buf);
194
                    if (i > 0)
195
                        codec->channels = i;
196
                    // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
197
                    //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
198
                }
199
                av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
200
                av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
201
                break;
202
            case CODEC_TYPE_VIDEO:
203
                av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
204
                break;
205
            default:
206
                break;
207
        }
208
        return 0;
209
    }
210

    
211
    return -1;
212
}
213

    
214
/* return the length and optionnaly the data */
215
static int hex_to_data(uint8_t *data, const char *p)
216
{
217
    int c, len, v;
218

    
219
    len = 0;
220
    v = 1;
221
    for(;;) {
222
        skip_spaces(&p);
223
        if (p == '\0')
224
            break;
225
        c = toupper((unsigned char)*p++);
226
        if (c >= '0' && c <= '9')
227
            c = c - '0';
228
        else if (c >= 'A' && c <= 'F')
229
            c = c - 'A' + 10;
230
        else
231
            break;
232
        v = (v << 4) | c;
233
        if (v & 0x100) {
234
            if (data)
235
                data[len] = v;
236
            len++;
237
            v = 1;
238
        }
239
    }
240
    return len;
241
}
242

    
243
static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
244
{
245
    switch (codec->codec_id) {
246
        case CODEC_ID_MPEG4:
247
        case CODEC_ID_AAC:
248
            if (!strcmp(attr, "config")) {
249
                /* decode the hexa encoded parameter */
250
                int len = hex_to_data(NULL, value);
251
                codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
252
                if (!codec->extradata)
253
                    return;
254
                codec->extradata_size = len;
255
                hex_to_data(codec->extradata, value);
256
            }
257
            break;
258
        default:
259
            break;
260
    }
261
    return;
262
}
263

    
264
typedef struct attrname_map
265
{
266
    const char *str;
267
    uint16_t type;
268
    uint32_t offset;
269
} attrname_map_t;
270

    
271
/* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
272
#define ATTR_NAME_TYPE_INT 0
273
#define ATTR_NAME_TYPE_STR 1
274
static attrname_map_t attr_names[]=
275
{
276
    {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
277
    {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
278
    {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
279
    {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
280
    {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
281
    {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
282
    {NULL, -1, -1},
283
};
284

    
285
/** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
286
* because it is used in rtp_h264.c, which is forthcoming.
287
*/
288
int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
289
{
290
    skip_spaces(p);
291
    if(**p)
292
    {
293
        get_word_sep(attr, attr_size, "=", p);
294
        if (**p == '=')
295
            (*p)++;
296
        get_word_sep(value, value_size, ";", p);
297
        if (**p == ';')
298
            (*p)++;
299
        return 1;
300
    }
301
    return 0;
302
}
303

    
304
/* parse a SDP line and save stream attributes */
305
static void sdp_parse_fmtp(AVStream *st, const char *p)
306
{
307
    char attr[256];
308
    char value[4096];
309
    int i;
310

    
311
    RTSPStream *rtsp_st = st->priv_data;
312
    AVCodecContext *codec = st->codec;
313
    rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
314

    
315
    /* loop on each attribute */
316
    while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
317
    {
318
        /* grab the codec extra_data from the config parameter of the fmtp line */
319
        sdp_parse_fmtp_config(codec, attr, value);
320
        /* Looking for a known attribute */
321
        for (i = 0; attr_names[i].str; ++i) {
322
            if (!strcasecmp(attr, attr_names[i].str)) {
323
                if (attr_names[i].type == ATTR_NAME_TYPE_INT)
324
                    *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
325
                else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
326
                    *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
327
            }
328
        }
329
    }
330
}
331

    
332
/** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
333
 *  and end time.
334
 *  Used for seeking in the rtp stream.
335
 */
336
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
337
{
338
    char buf[256];
339

    
340
    skip_spaces(&p);
341
    if (!stristart(p, "npt=", &p))
342
        return;
343

    
344
    *start = AV_NOPTS_VALUE;
345
    *end = AV_NOPTS_VALUE;
346

    
347
    get_word_sep(buf, sizeof(buf), "-", &p);
348
    *start = parse_date(buf, 1);
349
    if (*p == '-') {
350
        p++;
351
        get_word_sep(buf, sizeof(buf), "-", &p);
352
        *end = parse_date(buf, 1);
353
    }
354
//    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
355
//    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
356
}
357

    
358
typedef struct SDPParseState {
359
    /* SDP only */
360
    struct in_addr default_ip;
361
    int default_ttl;
362
} SDPParseState;
363

    
364
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
365
                           int letter, const char *buf)
366
{
367
    RTSPState *rt = s->priv_data;
368
    char buf1[64], st_type[64];
369
    const char *p;
370
    int codec_type, payload_type, i;
371
    AVStream *st;
372
    RTSPStream *rtsp_st;
373
    struct in_addr sdp_ip;
374
    int ttl;
375

    
376
#ifdef DEBUG
377
    printf("sdp: %c='%s'\n", letter, buf);
378
#endif
379

    
380
    p = buf;
381
    switch(letter) {
382
    case 'c':
383
        get_word(buf1, sizeof(buf1), &p);
384
        if (strcmp(buf1, "IN") != 0)
385
            return;
386
        get_word(buf1, sizeof(buf1), &p);
387
        if (strcmp(buf1, "IP4") != 0)
388
            return;
389
        get_word_sep(buf1, sizeof(buf1), "/", &p);
390
        if (inet_aton(buf1, &sdp_ip) == 0)
391
            return;
392
        ttl = 16;
393
        if (*p == '/') {
394
            p++;
395
            get_word_sep(buf1, sizeof(buf1), "/", &p);
396
            ttl = atoi(buf1);
397
        }
398
        if (s->nb_streams == 0) {
399
            s1->default_ip = sdp_ip;
400
            s1->default_ttl = ttl;
401
        } else {
402
            st = s->streams[s->nb_streams - 1];
403
            rtsp_st = st->priv_data;
404
            rtsp_st->sdp_ip = sdp_ip;
405
            rtsp_st->sdp_ttl = ttl;
406
        }
407
        break;
408
    case 's':
409
        pstrcpy(s->title, sizeof(s->title), p);
410
        break;
411
    case 'i':
412
        if (s->nb_streams == 0) {
413
            pstrcpy(s->comment, sizeof(s->comment), p);
414
            break;
415
        }
416
        break;
417
    case 'm':
418
        /* new stream */
419
        get_word(st_type, sizeof(st_type), &p);
420
        if (!strcmp(st_type, "audio")) {
421
            codec_type = CODEC_TYPE_AUDIO;
422
        } else if (!strcmp(st_type, "video")) {
423
            codec_type = CODEC_TYPE_VIDEO;
424
        } else {
425
            return;
426
        }
427
        rtsp_st = av_mallocz(sizeof(RTSPStream));
428
        if (!rtsp_st)
429
            return;
430
        rtsp_st->stream_index = -1;
431
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
432

    
433
        rtsp_st->sdp_ip = s1->default_ip;
434
        rtsp_st->sdp_ttl = s1->default_ttl;
435

    
436
        get_word(buf1, sizeof(buf1), &p); /* port */
437
        rtsp_st->sdp_port = atoi(buf1);
438

    
439
        get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
440

    
441
        /* XXX: handle list of formats */
442
        get_word(buf1, sizeof(buf1), &p); /* format list */
443
        rtsp_st->sdp_payload_type = atoi(buf1);
444

    
445
        if (!strcmp(AVRtpPayloadTypes[rtsp_st->sdp_payload_type].enc_name, "MP2T")) {
446
            /* no corresponding stream */
447
        } else {
448
            st = av_new_stream(s, 0);
449
            if (!st)
450
                return;
451
            st->priv_data = rtsp_st;
452
            rtsp_st->stream_index = st->index;
453
            st->codec->codec_type = codec_type;
454
            if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
455
                /* if standard payload type, we can find the codec right now */
456
                rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
457
            }
458
        }
459
        /* put a default control url */
460
        pstrcpy(rtsp_st->control_url, sizeof(rtsp_st->control_url), s->filename);
461
        break;
462
    case 'a':
463
        if (strstart(p, "control:", &p) && s->nb_streams > 0) {
464
            char proto[32];
465
            /* get the control url */
466
            st = s->streams[s->nb_streams - 1];
467
            rtsp_st = st->priv_data;
468

    
469
            /* XXX: may need to add full url resolution */
470
            url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
471
            if (proto[0] == '\0') {
472
                /* relative control URL */
473
                pstrcat(rtsp_st->control_url, sizeof(rtsp_st->control_url), "/");
474
                pstrcat(rtsp_st->control_url, sizeof(rtsp_st->control_url), p);
475
            } else {
476
                pstrcpy(rtsp_st->control_url, sizeof(rtsp_st->control_url), p);
477
            }
478
        } else if (strstart(p, "rtpmap:", &p)) {
479
            /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
480
            get_word(buf1, sizeof(buf1), &p);
481
            payload_type = atoi(buf1);
482
            for(i = 0; i < s->nb_streams;i++) {
483
                st = s->streams[i];
484
                rtsp_st = st->priv_data;
485
                if (rtsp_st->sdp_payload_type == payload_type) {
486
                    sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
487
                }
488
            }
489
        } else if (strstart(p, "fmtp:", &p)) {
490
            /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
491
            get_word(buf1, sizeof(buf1), &p);
492
            payload_type = atoi(buf1);
493
            for(i = 0; i < s->nb_streams;i++) {
494
                st = s->streams[i];
495
                rtsp_st = st->priv_data;
496
                if (rtsp_st->sdp_payload_type == payload_type) {
497
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
498
                        if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
499
                            sdp_parse_fmtp(st, p);
500
                        }
501
                    } else {
502
                        sdp_parse_fmtp(st, p);
503
                    }
504
                }
505
            }
506
        } else if(strstart(p, "framesize:", &p)) {
507
            // let dynamic protocol handlers have a stab at the line.
508
            get_word(buf1, sizeof(buf1), &p);
509
            payload_type = atoi(buf1);
510
            for(i = 0; i < s->nb_streams;i++) {
511
                st = s->streams[i];
512
                rtsp_st = st->priv_data;
513
                if (rtsp_st->sdp_payload_type == payload_type) {
514
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
515
                        rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
516
                    }
517
                }
518
            }
519
        } else if(strstart(p, "range:", &p)) {
520
            int64_t start, end;
521

    
522
            // this is so that seeking on a streamed file can work.
523
            rtsp_parse_range_npt(p, &start, &end);
524
            s->start_time= start;
525
            s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
526
        }
527
        break;
528
    }
529
}
530

    
531
static int sdp_parse(AVFormatContext *s, const char *content)
532
{
533
    const char *p;
534
    int letter;
535
    char buf[1024], *q;
536
    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
537

    
538
    memset(s1, 0, sizeof(SDPParseState));
539
    p = content;
540
    for(;;) {
541
        skip_spaces(&p);
542
        letter = *p;
543
        if (letter == '\0')
544
            break;
545
        p++;
546
        if (*p != '=')
547
            goto next_line;
548
        p++;
549
        /* get the content */
550
        q = buf;
551
        while (*p != '\n' && *p != '\r' && *p != '\0') {
552
            if ((q - buf) < sizeof(buf) - 1)
553
                *q++ = *p;
554
            p++;
555
        }
556
        *q = '\0';
557
        sdp_parse_line(s, s1, letter, buf);
558
    next_line:
559
        while (*p != '\n' && *p != '\0')
560
            p++;
561
        if (*p == '\n')
562
            p++;
563
    }
564
    return 0;
565
}
566

    
567
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
568
{
569
    const char *p;
570
    int v;
571

    
572
    p = *pp;
573
    skip_spaces(&p);
574
    v = strtol(p, (char **)&p, 10);
575
    if (*p == '-') {
576
        p++;
577
        *min_ptr = v;
578
        v = strtol(p, (char **)&p, 10);
579
        *max_ptr = v;
580
    } else {
581
        *min_ptr = v;
582
        *max_ptr = v;
583
    }
584
    *pp = p;
585
}
586

    
587
/* XXX: only one transport specification is parsed */
588
static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
589
{
590
    char transport_protocol[16];
591
    char profile[16];
592
    char lower_transport[16];
593
    char parameter[16];
594
    RTSPTransportField *th;
595
    char buf[256];
596

    
597
    reply->nb_transports = 0;
598

    
599
    for(;;) {
600
        skip_spaces(&p);
601
        if (*p == '\0')
602
            break;
603

    
604
        th = &reply->transports[reply->nb_transports];
605

    
606
        get_word_sep(transport_protocol, sizeof(transport_protocol),
607
                     "/", &p);
608
        if (*p == '/')
609
            p++;
610
        get_word_sep(profile, sizeof(profile), "/;,", &p);
611
        lower_transport[0] = '\0';
612
        if (*p == '/') {
613
            p++;
614
            get_word_sep(lower_transport, sizeof(lower_transport),
615
                         ";,", &p);
616
        }
617
        if (!strcasecmp(lower_transport, "TCP"))
618
            th->protocol = RTSP_PROTOCOL_RTP_TCP;
619
        else
620
            th->protocol = RTSP_PROTOCOL_RTP_UDP;
621

    
622
        if (*p == ';')
623
            p++;
624
        /* get each parameter */
625
        while (*p != '\0' && *p != ',') {
626
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
627
            if (!strcmp(parameter, "port")) {
628
                if (*p == '=') {
629
                    p++;
630
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
631
                }
632
            } else if (!strcmp(parameter, "client_port")) {
633
                if (*p == '=') {
634
                    p++;
635
                    rtsp_parse_range(&th->client_port_min,
636
                                     &th->client_port_max, &p);
637
                }
638
            } else if (!strcmp(parameter, "server_port")) {
639
                if (*p == '=') {
640
                    p++;
641
                    rtsp_parse_range(&th->server_port_min,
642
                                     &th->server_port_max, &p);
643
                }
644
            } else if (!strcmp(parameter, "interleaved")) {
645
                if (*p == '=') {
646
                    p++;
647
                    rtsp_parse_range(&th->interleaved_min,
648
                                     &th->interleaved_max, &p);
649
                }
650
            } else if (!strcmp(parameter, "multicast")) {
651
                if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
652
                    th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
653
            } else if (!strcmp(parameter, "ttl")) {
654
                if (*p == '=') {
655
                    p++;
656
                    th->ttl = strtol(p, (char **)&p, 10);
657
                }
658
            } else if (!strcmp(parameter, "destination")) {
659
                struct in_addr ipaddr;
660

    
661
                if (*p == '=') {
662
                    p++;
663
                    get_word_sep(buf, sizeof(buf), ";,", &p);
664
                    if (inet_aton(buf, &ipaddr))
665
                        th->destination = ntohl(ipaddr.s_addr);
666
                }
667
            }
668
            while (*p != ';' && *p != '\0' && *p != ',')
669
                p++;
670
            if (*p == ';')
671
                p++;
672
        }
673
        if (*p == ',')
674
            p++;
675

    
676
        reply->nb_transports++;
677
    }
678
}
679

    
680
void rtsp_parse_line(RTSPHeader *reply, const char *buf)
681
{
682
    const char *p;
683

    
684
    /* NOTE: we do case independent match for broken servers */
685
    p = buf;
686
    if (stristart(p, "Session:", &p)) {
687
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
688
    } else if (stristart(p, "Content-Length:", &p)) {
689
        reply->content_length = strtol(p, NULL, 10);
690
    } else if (stristart(p, "Transport:", &p)) {
691
        rtsp_parse_transport(reply, p);
692
    } else if (stristart(p, "CSeq:", &p)) {
693
        reply->seq = strtol(p, NULL, 10);
694
    } else if (stristart(p, "Range:", &p)) {
695
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
696
    }
697
}
698

    
699
static int url_readbuf(URLContext *h, unsigned char *buf, int size)
700
{
701
    int ret, len;
702

    
703
    len = 0;
704
    while (len < size) {
705
        ret = url_read(h, buf+len, size-len);
706
        if (ret < 1)
707
            return ret;
708
        len += ret;
709
    }
710
    return len;
711
}
712

    
713
/* skip a RTP/TCP interleaved packet */
714
static void rtsp_skip_packet(AVFormatContext *s)
715
{
716
    RTSPState *rt = s->priv_data;
717
    int ret, len, len1;
718
    uint8_t buf[1024];
719

    
720
    ret = url_readbuf(rt->rtsp_hd, buf, 3);
721
    if (ret != 3)
722
        return;
723
    len = (buf[1] << 8) | buf[2];
724
#ifdef DEBUG
725
    printf("skipping RTP packet len=%d\n", len);
726
#endif
727
    /* skip payload */
728
    while (len > 0) {
729
        len1 = len;
730
        if (len1 > sizeof(buf))
731
            len1 = sizeof(buf);
732
        ret = url_readbuf(rt->rtsp_hd, buf, len1);
733
        if (ret != len1)
734
            return;
735
        len -= len1;
736
    }
737
}
738

    
739
static void rtsp_send_cmd(AVFormatContext *s,
740
                          const char *cmd, RTSPHeader *reply,
741
                          unsigned char **content_ptr)
742
{
743
    RTSPState *rt = s->priv_data;
744
    char buf[4096], buf1[1024], *q;
745
    unsigned char ch;
746
    const char *p;
747
    int content_length, line_count;
748
    unsigned char *content = NULL;
749

    
750
    memset(reply, 0, sizeof(RTSPHeader));
751

    
752
    rt->seq++;
753
    pstrcpy(buf, sizeof(buf), cmd);
754
    snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
755
    pstrcat(buf, sizeof(buf), buf1);
756
    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
757
        snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
758
        pstrcat(buf, sizeof(buf), buf1);
759
    }
760
    pstrcat(buf, sizeof(buf), "\r\n");
761
#ifdef DEBUG
762
    printf("Sending:\n%s--\n", buf);
763
#endif
764
    url_write(rt->rtsp_hd, buf, strlen(buf));
765

    
766
    /* parse reply (XXX: use buffers) */
767
    line_count = 0;
768
    rt->last_reply[0] = '\0';
769
    for(;;) {
770
        q = buf;
771
        for(;;) {
772
            if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
773
                break;
774
            if (ch == '\n')
775
                break;
776
            if (ch == '$') {
777
                /* XXX: only parse it if first char on line ? */
778
                rtsp_skip_packet(s);
779
            } else if (ch != '\r') {
780
                if ((q - buf) < sizeof(buf) - 1)
781
                    *q++ = ch;
782
            }
783
        }
784
        *q = '\0';
785
#ifdef DEBUG
786
        printf("line='%s'\n", buf);
787
#endif
788
        /* test if last line */
789
        if (buf[0] == '\0')
790
            break;
791
        p = buf;
792
        if (line_count == 0) {
793
            /* get reply code */
794
            get_word(buf1, sizeof(buf1), &p);
795
            get_word(buf1, sizeof(buf1), &p);
796
            reply->status_code = atoi(buf1);
797
        } else {
798
            rtsp_parse_line(reply, p);
799
            pstrcat(rt->last_reply, sizeof(rt->last_reply), p);
800
            pstrcat(rt->last_reply, sizeof(rt->last_reply), "\n");
801
        }
802
        line_count++;
803
    }
804

    
805
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
806
        pstrcpy(rt->session_id, sizeof(rt->session_id), reply->session_id);
807

    
808
    content_length = reply->content_length;
809
    if (content_length > 0) {
810
        /* leave some room for a trailing '\0' (useful for simple parsing) */
811
        content = av_malloc(content_length + 1);
812
        (void)url_readbuf(rt->rtsp_hd, content, content_length);
813
        content[content_length] = '\0';
814
    }
815
    if (content_ptr)
816
        *content_ptr = content;
817
}
818

    
819
/* useful for modules: set RTSP callback function */
820

    
821
void rtsp_set_callback(FFRTSPCallback *rtsp_cb)
822
{
823
    ff_rtsp_callback = rtsp_cb;
824
}
825

    
826

    
827
/* close and free RTSP streams */
828
static void rtsp_close_streams(RTSPState *rt)
829
{
830
    int i;
831
    RTSPStream *rtsp_st;
832

    
833
    for(i=0;i<rt->nb_rtsp_streams;i++) {
834
        rtsp_st = rt->rtsp_streams[i];
835
        if (rtsp_st) {
836
            if (rtsp_st->rtp_ctx)
837
                rtp_parse_close(rtsp_st->rtp_ctx);
838
            if (rtsp_st->rtp_handle)
839
                url_close(rtsp_st->rtp_handle);
840
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
841
                rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
842
        }
843
        av_free(rtsp_st);
844
    }
845
    av_free(rt->rtsp_streams);
846
}
847

    
848
static int rtsp_read_header(AVFormatContext *s,
849
                            AVFormatParameters *ap)
850
{
851
    RTSPState *rt = s->priv_data;
852
    char host[1024], path[1024], tcpname[1024], cmd[2048];
853
    URLContext *rtsp_hd;
854
    int port, i, j, ret, err;
855
    RTSPHeader reply1, *reply = &reply1;
856
    unsigned char *content = NULL;
857
    RTSPStream *rtsp_st;
858
    int protocol_mask;
859
    AVStream *st;
860

    
861
    /* extract hostname and port */
862
    url_split(NULL, 0, NULL, 0,
863
              host, sizeof(host), &port, path, sizeof(path), s->filename);
864
    if (port < 0)
865
        port = RTSP_DEFAULT_PORT;
866

    
867
    /* open the tcp connexion */
868
    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
869
    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
870
        return AVERROR_IO;
871
    rt->rtsp_hd = rtsp_hd;
872
    rt->seq = 0;
873

    
874
    /* describe the stream */
875
    snprintf(cmd, sizeof(cmd),
876
             "DESCRIBE %s RTSP/1.0\r\n"
877
             "Accept: application/sdp\r\n",
878
             s->filename);
879
    rtsp_send_cmd(s, cmd, reply, &content);
880
    if (!content) {
881
        err = AVERROR_INVALIDDATA;
882
        goto fail;
883
    }
884
    if (reply->status_code != RTSP_STATUS_OK) {
885
        err = AVERROR_INVALIDDATA;
886
        goto fail;
887
    }
888

    
889
    /* now we got the SDP description, we parse it */
890
    ret = sdp_parse(s, (const char *)content);
891
    av_freep(&content);
892
    if (ret < 0) {
893
        err = AVERROR_INVALIDDATA;
894
        goto fail;
895
    }
896

    
897
    protocol_mask = rtsp_default_protocols;
898

    
899
    /* for each stream, make the setup request */
900
    /* XXX: we assume the same server is used for the control of each
901
       RTSP stream */
902

    
903
    for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
904
        char transport[2048];
905

    
906
        rtsp_st = rt->rtsp_streams[i];
907

    
908
        /* compute available transports */
909
        transport[0] = '\0';
910

    
911
        /* RTP/UDP */
912
        if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
913
            char buf[256];
914

    
915
            /* first try in specified port range */
916
            if (RTSP_RTP_PORT_MIN != 0) {
917
                while(j <= RTSP_RTP_PORT_MAX) {
918
                    snprintf(buf, sizeof(buf), "rtp://?localport=%d", j);
919
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
920
                        j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
921
                        goto rtp_opened;
922
                    }
923
                }
924
            }
925

    
926
/*            then try on any port
927
**            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
928
**                err = AVERROR_INVALIDDATA;
929
**                goto fail;
930
**            }
931
*/
932

    
933
        rtp_opened:
934
            port = rtp_get_local_port(rtsp_st->rtp_handle);
935
            if (transport[0] != '\0')
936
                pstrcat(transport, sizeof(transport), ",");
937
            snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
938
                     "RTP/AVP/UDP;unicast;client_port=%d-%d",
939
                     port, port + 1);
940
        }
941

    
942
        /* RTP/TCP */
943
        else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
944
            if (transport[0] != '\0')
945
                pstrcat(transport, sizeof(transport), ",");
946
            snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
947
                     "RTP/AVP/TCP");
948
        }
949

    
950
        else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
951
            if (transport[0] != '\0')
952
                pstrcat(transport, sizeof(transport), ",");
953
            snprintf(transport + strlen(transport),
954
                     sizeof(transport) - strlen(transport) - 1,
955
                     "RTP/AVP/UDP;multicast");
956
        }
957
        snprintf(cmd, sizeof(cmd),
958
                 "SETUP %s RTSP/1.0\r\n"
959
                 "Transport: %s\r\n",
960
                 rtsp_st->control_url, transport);
961
        rtsp_send_cmd(s, cmd, reply, NULL);
962
        if (reply->status_code != RTSP_STATUS_OK ||
963
            reply->nb_transports != 1) {
964
            err = AVERROR_INVALIDDATA;
965
            goto fail;
966
        }
967

    
968
        /* XXX: same protocol for all streams is required */
969
        if (i > 0) {
970
            if (reply->transports[0].protocol != rt->protocol) {
971
                err = AVERROR_INVALIDDATA;
972
                goto fail;
973
            }
974
        } else {
975
            rt->protocol = reply->transports[0].protocol;
976
        }
977

    
978
        /* close RTP connection if not choosen */
979
        if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
980
            (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
981
            url_close(rtsp_st->rtp_handle);
982
            rtsp_st->rtp_handle = NULL;
983
        }
984

    
985
        switch(reply->transports[0].protocol) {
986
        case RTSP_PROTOCOL_RTP_TCP:
987
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
988
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
989
            break;
990

    
991
        case RTSP_PROTOCOL_RTP_UDP:
992
            {
993
                char url[1024];
994

    
995
                /* XXX: also use address if specified */
996
                snprintf(url, sizeof(url), "rtp://%s:%d",
997
                         host, reply->transports[0].server_port_min);
998
                if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
999
                    err = AVERROR_INVALIDDATA;
1000
                    goto fail;
1001
                }
1002
            }
1003
            break;
1004
        case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1005
            {
1006
                char url[1024];
1007
                int ttl;
1008

    
1009
                ttl = reply->transports[0].ttl;
1010
                if (!ttl)
1011
                    ttl = 16;
1012
                snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1013
                         host,
1014
                         reply->transports[0].server_port_min,
1015
                         ttl);
1016
                if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1017
                    err = AVERROR_INVALIDDATA;
1018
                    goto fail;
1019
                }
1020
            }
1021
            break;
1022
        }
1023
        /* open the RTP context */
1024
        st = NULL;
1025
        if (rtsp_st->stream_index >= 0)
1026
            st = s->streams[rtsp_st->stream_index];
1027
        if (!st)
1028
            s->ctx_flags |= AVFMTCTX_NOHEADER;
1029
        rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1030

    
1031
        if (!rtsp_st->rtp_ctx) {
1032
            err = AVERROR_NOMEM;
1033
            goto fail;
1034
        } else {
1035
            if(rtsp_st->dynamic_handler) {
1036
                rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1037
                rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1038
            }
1039
        }
1040
    }
1041

    
1042
    /* use callback if available to extend setup */
1043
    if (ff_rtsp_callback) {
1044
        if (ff_rtsp_callback(RTSP_ACTION_CLIENT_SETUP, rt->session_id,
1045
                             NULL, 0, rt->last_reply) < 0) {
1046
            err = AVERROR_INVALIDDATA;
1047
            goto fail;
1048
        }
1049
    }
1050

    
1051

    
1052
    rt->state = RTSP_STATE_IDLE;
1053
    rt->seek_timestamp = 0; /* default is to start stream at position
1054
                               zero */
1055
    if (ap->initial_pause) {
1056
        /* do not start immediately */
1057
    } else {
1058
        if (rtsp_read_play(s) < 0) {
1059
            err = AVERROR_INVALIDDATA;
1060
            goto fail;
1061
        }
1062
    }
1063
    return 0;
1064
 fail:
1065
    rtsp_close_streams(rt);
1066
    av_freep(&content);
1067
    url_close(rt->rtsp_hd);
1068
    return err;
1069
}
1070

    
1071
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1072
                           uint8_t *buf, int buf_size)
1073
{
1074
    RTSPState *rt = s->priv_data;
1075
    int id, len, i, ret;
1076
    RTSPStream *rtsp_st;
1077

    
1078
#ifdef DEBUG_RTP_TCP
1079
    printf("tcp_read_packet:\n");
1080
#endif
1081
 redo:
1082
    for(;;) {
1083
        ret = url_readbuf(rt->rtsp_hd, buf, 1);
1084
#ifdef DEBUG_RTP_TCP
1085
        printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1086
#endif
1087
        if (ret != 1)
1088
            return -1;
1089
        if (buf[0] == '$')
1090
            break;
1091
    }
1092
    ret = url_readbuf(rt->rtsp_hd, buf, 3);
1093
    if (ret != 3)
1094
        return -1;
1095
    id = buf[0];
1096
    len = (buf[1] << 8) | buf[2];
1097
#ifdef DEBUG_RTP_TCP
1098
    printf("id=%d len=%d\n", id, len);
1099
#endif
1100
    if (len > buf_size || len < 12)
1101
        goto redo;
1102
    /* get the data */
1103
    ret = url_readbuf(rt->rtsp_hd, buf, len);
1104
    if (ret != len)
1105
        return -1;
1106

    
1107
    /* find the matching stream */
1108
    for(i = 0; i < rt->nb_rtsp_streams; i++) {
1109
        rtsp_st = rt->rtsp_streams[i];
1110
        if (id >= rtsp_st->interleaved_min &&
1111
            id <= rtsp_st->interleaved_max)
1112
            goto found;
1113
    }
1114
    goto redo;
1115
 found:
1116
    *prtsp_st = rtsp_st;
1117
    return len;
1118
}
1119

    
1120
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1121
                           uint8_t *buf, int buf_size)
1122
{
1123
    RTSPState *rt = s->priv_data;
1124
    RTSPStream *rtsp_st;
1125
    fd_set rfds;
1126
    int fd1, fd2, fd_max, n, i, ret;
1127
    struct timeval tv;
1128

    
1129
    for(;;) {
1130
        if (url_interrupt_cb())
1131
            return -1;
1132
        FD_ZERO(&rfds);
1133
        fd_max = -1;
1134
        for(i = 0; i < rt->nb_rtsp_streams; i++) {
1135
            rtsp_st = rt->rtsp_streams[i];
1136
            /* currently, we cannot probe RTCP handle because of blocking restrictions */
1137
            rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1138
            if (fd1 > fd_max)
1139
                fd_max = fd1;
1140
            FD_SET(fd1, &rfds);
1141
        }
1142
        tv.tv_sec = 0;
1143
        tv.tv_usec = 100 * 1000;
1144
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1145
        if (n > 0) {
1146
            for(i = 0; i < rt->nb_rtsp_streams; i++) {
1147
                rtsp_st = rt->rtsp_streams[i];
1148
                rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1149
                if (FD_ISSET(fd1, &rfds)) {
1150
                    ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1151
                    if (ret > 0) {
1152
                        *prtsp_st = rtsp_st;
1153
                        return ret;
1154
                    }
1155
                }
1156
            }
1157
        }
1158
    }
1159
}
1160

    
1161
static int rtsp_read_packet(AVFormatContext *s,
1162
                            AVPacket *pkt)
1163
{
1164
    RTSPState *rt = s->priv_data;
1165
    RTSPStream *rtsp_st;
1166
    int ret, len;
1167
    uint8_t buf[RTP_MAX_PACKET_LENGTH];
1168

    
1169
    /* get next frames from the same RTP packet */
1170
    if (rt->cur_rtp) {
1171
        ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1172
        if (ret == 0) {
1173
            rt->cur_rtp = NULL;
1174
            return 0;
1175
        } else if (ret == 1) {
1176
            return 0;
1177
        } else {
1178
            rt->cur_rtp = NULL;
1179
        }
1180
    }
1181

    
1182
    /* read next RTP packet */
1183
 redo:
1184
    switch(rt->protocol) {
1185
    default:
1186
    case RTSP_PROTOCOL_RTP_TCP:
1187
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1188
        break;
1189
    case RTSP_PROTOCOL_RTP_UDP:
1190
    case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1191
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1192
        if (rtsp_st->rtp_ctx)
1193
            rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1194
        break;
1195
    }
1196
    if (len < 0)
1197
        return AVERROR_IO;
1198
    ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1199
    if (ret < 0)
1200
        goto redo;
1201
    if (ret == 1) {
1202
        /* more packets may follow, so we save the RTP context */
1203
        rt->cur_rtp = rtsp_st->rtp_ctx;
1204
    }
1205
    return 0;
1206
}
1207

    
1208
static int rtsp_read_play(AVFormatContext *s)
1209
{
1210
    RTSPState *rt = s->priv_data;
1211
    RTSPHeader reply1, *reply = &reply1;
1212
    char cmd[1024];
1213

    
1214
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1215

    
1216
    if (rt->state == RTSP_STATE_PAUSED) {
1217
        snprintf(cmd, sizeof(cmd),
1218
                 "PLAY %s RTSP/1.0\r\n",
1219
                 s->filename);
1220
    } else {
1221
        snprintf(cmd, sizeof(cmd),
1222
                 "PLAY %s RTSP/1.0\r\n"
1223
                 "Range: npt=%0.3f-\r\n",
1224
                 s->filename,
1225
                 (double)rt->seek_timestamp / AV_TIME_BASE);
1226
    }
1227
    rtsp_send_cmd(s, cmd, reply, NULL);
1228
    if (reply->status_code != RTSP_STATUS_OK) {
1229
        return -1;
1230
    } else {
1231
        rt->state = RTSP_STATE_PLAYING;
1232
        return 0;
1233
    }
1234
}
1235

    
1236
/* pause the stream */
1237
static int rtsp_read_pause(AVFormatContext *s)
1238
{
1239
    RTSPState *rt = s->priv_data;
1240
    RTSPHeader reply1, *reply = &reply1;
1241
    char cmd[1024];
1242

    
1243
    rt = s->priv_data;
1244

    
1245
    if (rt->state != RTSP_STATE_PLAYING)
1246
        return 0;
1247

    
1248
    snprintf(cmd, sizeof(cmd),
1249
             "PAUSE %s RTSP/1.0\r\n",
1250
             s->filename);
1251
    rtsp_send_cmd(s, cmd, reply, NULL);
1252
    if (reply->status_code != RTSP_STATUS_OK) {
1253
        return -1;
1254
    } else {
1255
        rt->state = RTSP_STATE_PAUSED;
1256
        return 0;
1257
    }
1258
}
1259

    
1260
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1261
                          int64_t timestamp, int flags)
1262
{
1263
    RTSPState *rt = s->priv_data;
1264

    
1265
    rt->seek_timestamp = timestamp;
1266
    switch(rt->state) {
1267
    default:
1268
    case RTSP_STATE_IDLE:
1269
        break;
1270
    case RTSP_STATE_PLAYING:
1271
        if (rtsp_read_play(s) != 0)
1272
            return -1;
1273
        break;
1274
    case RTSP_STATE_PAUSED:
1275
        rt->state = RTSP_STATE_IDLE;
1276
        break;
1277
    }
1278
    return 0;
1279
}
1280

    
1281
static int rtsp_read_close(AVFormatContext *s)
1282
{
1283
    RTSPState *rt = s->priv_data;
1284
    RTSPHeader reply1, *reply = &reply1;
1285
    char cmd[1024];
1286

    
1287
#if 0
1288
    /* NOTE: it is valid to flush the buffer here */
1289
    if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1290
        url_fclose(&rt->rtsp_gb);
1291
    }
1292
#endif
1293
    snprintf(cmd, sizeof(cmd),
1294
             "TEARDOWN %s RTSP/1.0\r\n",
1295
             s->filename);
1296
    rtsp_send_cmd(s, cmd, reply, NULL);
1297

    
1298
    if (ff_rtsp_callback) {
1299
        ff_rtsp_callback(RTSP_ACTION_CLIENT_TEARDOWN, rt->session_id,
1300
                         NULL, 0, NULL);
1301
    }
1302

    
1303
    rtsp_close_streams(rt);
1304
    url_close(rt->rtsp_hd);
1305
    return 0;
1306
}
1307

    
1308
AVInputFormat rtsp_demuxer = {
1309
    "rtsp",
1310
    "RTSP input format",
1311
    sizeof(RTSPState),
1312
    rtsp_probe,
1313
    rtsp_read_header,
1314
    rtsp_read_packet,
1315
    rtsp_read_close,
1316
    rtsp_read_seek,
1317
    .flags = AVFMT_NOFILE,
1318
    .read_play = rtsp_read_play,
1319
    .read_pause = rtsp_read_pause,
1320
};
1321

    
1322
static int sdp_probe(AVProbeData *p1)
1323
{
1324
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1325

    
1326
    /* we look for a line beginning "c=IN IP4" */
1327
    while (p < p_end && *p != '\0') {
1328
        if (p + sizeof("c=IN IP4") - 1 < p_end && strstart(p, "c=IN IP4", NULL))
1329
            return AVPROBE_SCORE_MAX / 2;
1330

    
1331
        while(p < p_end - 1 && *p != '\n') p++;
1332
        if (++p >= p_end)
1333
            break;
1334
        if (*p == '\r')
1335
            p++;
1336
    }
1337
    return 0;
1338
}
1339

    
1340
#define SDP_MAX_SIZE 8192
1341

    
1342
static int sdp_read_header(AVFormatContext *s,
1343
                           AVFormatParameters *ap)
1344
{
1345
    RTSPState *rt = s->priv_data;
1346
    RTSPStream *rtsp_st;
1347
    int size, i, err;
1348
    char *content;
1349
    char url[1024];
1350
    AVStream *st;
1351

    
1352
    /* read the whole sdp file */
1353
    /* XXX: better loading */
1354
    content = av_malloc(SDP_MAX_SIZE);
1355
    size = get_buffer(&s->pb, content, SDP_MAX_SIZE - 1);
1356
    if (size <= 0) {
1357
        av_free(content);
1358
        return AVERROR_INVALIDDATA;
1359
    }
1360
    content[size] ='\0';
1361

    
1362
    sdp_parse(s, content);
1363
    av_free(content);
1364

    
1365
    /* open each RTP stream */
1366
    for(i=0;i<rt->nb_rtsp_streams;i++) {
1367
        rtsp_st = rt->rtsp_streams[i];
1368

    
1369
        snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1370
                 inet_ntoa(rtsp_st->sdp_ip),
1371
                 rtsp_st->sdp_port,
1372
                 rtsp_st->sdp_ttl);
1373
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1374
            err = AVERROR_INVALIDDATA;
1375
            goto fail;
1376
        }
1377
        /* open the RTP context */
1378
        st = NULL;
1379
        if (rtsp_st->stream_index >= 0)
1380
            st = s->streams[rtsp_st->stream_index];
1381
        if (!st)
1382
            s->ctx_flags |= AVFMTCTX_NOHEADER;
1383
        rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1384
        if (!rtsp_st->rtp_ctx) {
1385
            err = AVERROR_NOMEM;
1386
            goto fail;
1387
        } else {
1388
            if(rtsp_st->dynamic_handler) {
1389
                rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1390
                rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1391
            }
1392
        }
1393
    }
1394
    return 0;
1395
 fail:
1396
    rtsp_close_streams(rt);
1397
    return err;
1398
}
1399

    
1400
static int sdp_read_packet(AVFormatContext *s,
1401
                            AVPacket *pkt)
1402
{
1403
    return rtsp_read_packet(s, pkt);
1404
}
1405

    
1406
static int sdp_read_close(AVFormatContext *s)
1407
{
1408
    RTSPState *rt = s->priv_data;
1409
    rtsp_close_streams(rt);
1410
    return 0;
1411
}
1412

    
1413
#ifdef CONFIG_SDP_DEMUXER
1414
AVInputFormat sdp_demuxer = {
1415
    "sdp",
1416
    "SDP",
1417
    sizeof(RTSPState),
1418
    sdp_probe,
1419
    sdp_read_header,
1420
    sdp_read_packet,
1421
    sdp_read_close,
1422
};
1423
#endif
1424

    
1425
/* dummy redirector format (used directly in av_open_input_file now) */
1426
static int redir_probe(AVProbeData *pd)
1427
{
1428
    const char *p;
1429
    p = pd->buf;
1430
    while (redir_isspace(*p))
1431
        p++;
1432
    if (strstart(p, "http://", NULL) ||
1433
        strstart(p, "rtsp://", NULL))
1434
        return AVPROBE_SCORE_MAX;
1435
    return 0;
1436
}
1437

    
1438
/* called from utils.c */
1439
int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f)
1440
{
1441
    char buf[4096], *q;
1442
    int c;
1443
    AVFormatContext *ic = NULL;
1444

    
1445
    /* parse each URL and try to open it */
1446
    c = url_fgetc(f);
1447
    while (c != URL_EOF) {
1448
        /* skip spaces */
1449
        for(;;) {
1450
            if (!redir_isspace(c))
1451
                break;
1452
            c = url_fgetc(f);
1453
        }
1454
        if (c == URL_EOF)
1455
            break;
1456
        /* record url */
1457
        q = buf;
1458
        for(;;) {
1459
            if (c == URL_EOF || redir_isspace(c))
1460
                break;
1461
            if ((q - buf) < sizeof(buf) - 1)
1462
                *q++ = c;
1463
            c = url_fgetc(f);
1464
        }
1465
        *q = '\0';
1466
        //printf("URL='%s'\n", buf);
1467
        /* try to open the media file */
1468
        if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1469
            break;
1470
    }
1471
    *ic_ptr = ic;
1472
    if (!ic)
1473
        return AVERROR_IO;
1474
    else
1475
        return 0;
1476
}
1477

    
1478
AVInputFormat redir_demuxer = {
1479
    "redir",
1480
    "Redirector format",
1481
    0,
1482
    redir_probe,
1483
    NULL,
1484
    NULL,
1485
    NULL,
1486
};