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1
/*
2
 * RTSP/SDP client
3
 * Copyright (c) 2002 Fabrice Bellard.
4
 *
5
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 <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"
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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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};
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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

    
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    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;
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} RTSPState;
56

    
57
typedef struct RTSPStream {
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    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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    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

    
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#if LIBAVFORMAT_VERSION_INT < (53 << 16)
81
int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
82
#endif
83

    
84
static int rtsp_probe(AVProbeData *p)
85
{
86
    if (av_strstart(p->filename, "rtsp:", NULL))
87
        return AVPROBE_SCORE_MAX;
88
    return 0;
89
}
90

    
91
static int redir_isspace(int c)
92
{
93
    return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
94
}
95

    
96
static void skip_spaces(const char **pp)
97
{
98
    const char *p;
99
    p = *pp;
100
    while (redir_isspace(*p))
101
        p++;
102
    *pp = p;
103
}
104

    
105
static void get_word_sep(char *buf, int buf_size, const char *sep,
106
                         const char **pp)
107
{
108
    const char *p;
109
    char *q;
110

    
111
    p = *pp;
112
    if (*p == '/')
113
        p++;
114
    skip_spaces(&p);
115
    q = buf;
116
    while (!strchr(sep, *p) && *p != '\0') {
117
        if ((q - buf) < buf_size - 1)
118
            *q++ = *p;
119
        p++;
120
    }
121
    if (buf_size > 0)
122
        *q = '\0';
123
    *pp = p;
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}
125

    
126
static void get_word(char *buf, int buf_size, const char **pp)
127
{
128
    const char *p;
129
    char *q;
130

    
131
    p = *pp;
132
    skip_spaces(&p);
133
    q = buf;
134
    while (!redir_isspace(*p) && *p != '\0') {
135
        if ((q - buf) < buf_size - 1)
136
            *q++ = *p;
137
        p++;
138
    }
139
    if (buf_size > 0)
140
        *q = '\0';
141
    *pp = p;
142
}
143

    
144
/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
145
   params>] */
146
static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
147
{
148
    char buf[256];
149
    int i;
150
    AVCodec *c;
151
    const char *c_name;
152

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

    
175
    c = avcodec_find_decoder(codec->codec_id);
176
    if (c && c->name)
177
        c_name = c->name;
178
    else
179
        c_name = (char *)NULL;
180

    
181
    if (c_name) {
182
        get_word_sep(buf, sizeof(buf), "/", &p);
183
        i = atoi(buf);
184
        switch (codec->codec_type) {
185
            case CODEC_TYPE_AUDIO:
186
                av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
187
                codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
188
                codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
189
                if (i > 0) {
190
                    codec->sample_rate = i;
191
                    get_word_sep(buf, sizeof(buf), "/", &p);
192
                    i = atoi(buf);
193
                    if (i > 0)
194
                        codec->channels = i;
195
                    // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
196
                    //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
197
                }
198
                av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
199
                av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
200
                break;
201
            case CODEC_TYPE_VIDEO:
202
                av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
203
                break;
204
            default:
205
                break;
206
        }
207
        return 0;
208
    }
209

    
210
    return -1;
211
}
212

    
213
/* return the length and optionnaly the data */
214
static int hex_to_data(uint8_t *data, const char *p)
215
{
216
    int c, len, v;
217

    
218
    len = 0;
219
    v = 1;
220
    for(;;) {
221
        skip_spaces(&p);
222
        if (p == '\0')
223
            break;
224
        c = toupper((unsigned char)*p++);
225
        if (c >= '0' && c <= '9')
226
            c = c - '0';
227
        else if (c >= 'A' && c <= 'F')
228
            c = c - 'A' + 10;
229
        else
230
            break;
231
        v = (v << 4) | c;
232
        if (v & 0x100) {
233
            if (data)
234
                data[len] = v;
235
            len++;
236
            v = 1;
237
        }
238
    }
239
    return len;
240
}
241

    
242
static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
243
{
244
    switch (codec->codec_id) {
245
        case CODEC_ID_MPEG4:
246
        case CODEC_ID_AAC:
247
            if (!strcmp(attr, "config")) {
248
                /* decode the hexa encoded parameter */
249
                int len = hex_to_data(NULL, value);
250
                codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
251
                if (!codec->extradata)
252
                    return;
253
                codec->extradata_size = len;
254
                hex_to_data(codec->extradata, value);
255
            }
256
            break;
257
        default:
258
            break;
259
    }
260
    return;
261
}
262

    
263
typedef struct attrname_map
264
{
265
    const char *str;
266
    uint16_t type;
267
    uint32_t offset;
268
} attrname_map_t;
269

    
270
/* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
271
#define ATTR_NAME_TYPE_INT 0
272
#define ATTR_NAME_TYPE_STR 1
273
static attrname_map_t attr_names[]=
274
{
275
    {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
276
    {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
277
    {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
278
    {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
279
    {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
280
    {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
281
    {NULL, -1, -1},
282
};
283

    
284
/** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
285
* because it is used in rtp_h264.c, which is forthcoming.
286
*/
287
int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
288
{
289
    skip_spaces(p);
290
    if(**p)
291
    {
292
        get_word_sep(attr, attr_size, "=", p);
293
        if (**p == '=')
294
            (*p)++;
295
        get_word_sep(value, value_size, ";", p);
296
        if (**p == ';')
297
            (*p)++;
298
        return 1;
299
    }
300
    return 0;
301
}
302

    
303
/* parse a SDP line and save stream attributes */
304
static void sdp_parse_fmtp(AVStream *st, const char *p)
305
{
306
    char attr[256];
307
    char value[4096];
308
    int i;
309

    
310
    RTSPStream *rtsp_st = st->priv_data;
311
    AVCodecContext *codec = st->codec;
312
    rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
313

    
314
    /* loop on each attribute */
315
    while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
316
    {
317
        /* grab the codec extra_data from the config parameter of the fmtp line */
318
        sdp_parse_fmtp_config(codec, attr, value);
319
        /* Looking for a known attribute */
320
        for (i = 0; attr_names[i].str; ++i) {
321
            if (!strcasecmp(attr, attr_names[i].str)) {
322
                if (attr_names[i].type == ATTR_NAME_TYPE_INT)
323
                    *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
324
                else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
325
                    *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
326
            }
327
        }
328
    }
329
}
330

    
331
/** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
332
 *  and end time.
333
 *  Used for seeking in the rtp stream.
334
 */
335
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
336
{
337
    char buf[256];
338

    
339
    skip_spaces(&p);
340
    if (!av_stristart(p, "npt=", &p))
341
        return;
342

    
343
    *start = AV_NOPTS_VALUE;
344
    *end = AV_NOPTS_VALUE;
345

    
346
    get_word_sep(buf, sizeof(buf), "-", &p);
347
    *start = parse_date(buf, 1);
348
    if (*p == '-') {
349
        p++;
350
        get_word_sep(buf, sizeof(buf), "-", &p);
351
        *end = parse_date(buf, 1);
352
    }
353
//    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
354
//    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
355
}
356

    
357
typedef struct SDPParseState {
358
    /* SDP only */
359
    struct in_addr default_ip;
360
    int default_ttl;
361
} SDPParseState;
362

    
363
static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
364
                           int letter, const char *buf)
365
{
366
    RTSPState *rt = s->priv_data;
367
    char buf1[64], st_type[64];
368
    const char *p;
369
    int codec_type, payload_type, i;
370
    AVStream *st;
371
    RTSPStream *rtsp_st;
372
    struct in_addr sdp_ip;
373
    int ttl;
374

    
375
#ifdef DEBUG
376
    printf("sdp: %c='%s'\n", letter, buf);
377
#endif
378

    
379
    p = buf;
380
    switch(letter) {
381
    case 'c':
382
        get_word(buf1, sizeof(buf1), &p);
383
        if (strcmp(buf1, "IN") != 0)
384
            return;
385
        get_word(buf1, sizeof(buf1), &p);
386
        if (strcmp(buf1, "IP4") != 0)
387
            return;
388
        get_word_sep(buf1, sizeof(buf1), "/", &p);
389
        if (inet_aton(buf1, &sdp_ip) == 0)
390
            return;
391
        ttl = 16;
392
        if (*p == '/') {
393
            p++;
394
            get_word_sep(buf1, sizeof(buf1), "/", &p);
395
            ttl = atoi(buf1);
396
        }
397
        if (s->nb_streams == 0) {
398
            s1->default_ip = sdp_ip;
399
            s1->default_ttl = ttl;
400
        } else {
401
            st = s->streams[s->nb_streams - 1];
402
            rtsp_st = st->priv_data;
403
            rtsp_st->sdp_ip = sdp_ip;
404
            rtsp_st->sdp_ttl = ttl;
405
        }
406
        break;
407
    case 's':
408
        av_strlcpy(s->title, p, sizeof(s->title));
409
        break;
410
    case 'i':
411
        if (s->nb_streams == 0) {
412
            av_strlcpy(s->comment, p, sizeof(s->comment));
413
            break;
414
        }
415
        break;
416
    case 'm':
417
        /* new stream */
418
        get_word(st_type, sizeof(st_type), &p);
419
        if (!strcmp(st_type, "audio")) {
420
            codec_type = CODEC_TYPE_AUDIO;
421
        } else if (!strcmp(st_type, "video")) {
422
            codec_type = CODEC_TYPE_VIDEO;
423
        } else {
424
            return;
425
        }
426
        rtsp_st = av_mallocz(sizeof(RTSPStream));
427
        if (!rtsp_st)
428
            return;
429
        rtsp_st->stream_index = -1;
430
        dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
431

    
432
        rtsp_st->sdp_ip = s1->default_ip;
433
        rtsp_st->sdp_ttl = s1->default_ttl;
434

    
435
        get_word(buf1, sizeof(buf1), &p); /* port */
436
        rtsp_st->sdp_port = atoi(buf1);
437

    
438
        get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
439

    
440
        /* XXX: handle list of formats */
441
        get_word(buf1, sizeof(buf1), &p); /* format list */
442
        rtsp_st->sdp_payload_type = atoi(buf1);
443

    
444
        if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
445
            /* no corresponding stream */
446
        } else {
447
            st = av_new_stream(s, 0);
448
            if (!st)
449
                return;
450
            st->priv_data = rtsp_st;
451
            rtsp_st->stream_index = st->index;
452
            st->codec->codec_type = codec_type;
453
            if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
454
                /* if standard payload type, we can find the codec right now */
455
                rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
456
            }
457
        }
458
        /* put a default control url */
459
        av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
460
        break;
461
    case 'a':
462
        if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
463
            char proto[32];
464
            /* get the control url */
465
            st = s->streams[s->nb_streams - 1];
466
            rtsp_st = st->priv_data;
467

    
468
            /* XXX: may need to add full url resolution */
469
            url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
470
            if (proto[0] == '\0') {
471
                /* relative control URL */
472
                av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
473
                av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
474
            } else {
475
                av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
476
            }
477
        } else if (av_strstart(p, "rtpmap:", &p)) {
478
            /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
479
            get_word(buf1, sizeof(buf1), &p);
480
            payload_type = atoi(buf1);
481
            for(i = 0; i < s->nb_streams;i++) {
482
                st = s->streams[i];
483
                rtsp_st = st->priv_data;
484
                if (rtsp_st->sdp_payload_type == payload_type) {
485
                    sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
486
                }
487
            }
488
        } else if (av_strstart(p, "fmtp:", &p)) {
489
            /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
490
            get_word(buf1, sizeof(buf1), &p);
491
            payload_type = atoi(buf1);
492
            for(i = 0; i < s->nb_streams;i++) {
493
                st = s->streams[i];
494
                rtsp_st = st->priv_data;
495
                if (rtsp_st->sdp_payload_type == payload_type) {
496
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
497
                        if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
498
                            sdp_parse_fmtp(st, p);
499
                        }
500
                    } else {
501
                        sdp_parse_fmtp(st, p);
502
                    }
503
                }
504
            }
505
        } else if(av_strstart(p, "framesize:", &p)) {
506
            // let dynamic protocol handlers have a stab at the line.
507
            get_word(buf1, sizeof(buf1), &p);
508
            payload_type = atoi(buf1);
509
            for(i = 0; i < s->nb_streams;i++) {
510
                st = s->streams[i];
511
                rtsp_st = st->priv_data;
512
                if (rtsp_st->sdp_payload_type == payload_type) {
513
                    if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
514
                        rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
515
                    }
516
                }
517
            }
518
        } else if(av_strstart(p, "range:", &p)) {
519
            int64_t start, end;
520

    
521
            // this is so that seeking on a streamed file can work.
522
            rtsp_parse_range_npt(p, &start, &end);
523
            s->start_time= start;
524
            s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
525
        }
526
        break;
527
    }
528
}
529

    
530
static int sdp_parse(AVFormatContext *s, const char *content)
531
{
532
    const char *p;
533
    int letter;
534
    char buf[1024], *q;
535
    SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
536

    
537
    memset(s1, 0, sizeof(SDPParseState));
538
    p = content;
539
    for(;;) {
540
        skip_spaces(&p);
541
        letter = *p;
542
        if (letter == '\0')
543
            break;
544
        p++;
545
        if (*p != '=')
546
            goto next_line;
547
        p++;
548
        /* get the content */
549
        q = buf;
550
        while (*p != '\n' && *p != '\r' && *p != '\0') {
551
            if ((q - buf) < sizeof(buf) - 1)
552
                *q++ = *p;
553
            p++;
554
        }
555
        *q = '\0';
556
        sdp_parse_line(s, s1, letter, buf);
557
    next_line:
558
        while (*p != '\n' && *p != '\0')
559
            p++;
560
        if (*p == '\n')
561
            p++;
562
    }
563
    return 0;
564
}
565

    
566
static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
567
{
568
    const char *p;
569
    int v;
570

    
571
    p = *pp;
572
    skip_spaces(&p);
573
    v = strtol(p, (char **)&p, 10);
574
    if (*p == '-') {
575
        p++;
576
        *min_ptr = v;
577
        v = strtol(p, (char **)&p, 10);
578
        *max_ptr = v;
579
    } else {
580
        *min_ptr = v;
581
        *max_ptr = v;
582
    }
583
    *pp = p;
584
}
585

    
586
/* XXX: only one transport specification is parsed */
587
static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
588
{
589
    char transport_protocol[16];
590
    char profile[16];
591
    char lower_transport[16];
592
    char parameter[16];
593
    RTSPTransportField *th;
594
    char buf[256];
595

    
596
    reply->nb_transports = 0;
597

    
598
    for(;;) {
599
        skip_spaces(&p);
600
        if (*p == '\0')
601
            break;
602

    
603
        th = &reply->transports[reply->nb_transports];
604

    
605
        get_word_sep(transport_protocol, sizeof(transport_protocol),
606
                     "/", &p);
607
        if (*p == '/')
608
            p++;
609
        if (!strcasecmp (transport_protocol, "rtp")) {
610
            get_word_sep(profile, sizeof(profile), "/;,", &p);
611
            lower_transport[0] = '\0';
612
            /* rtp/avp/<protocol> */
613
            if (*p == '/') {
614
                p++;
615
                get_word_sep(lower_transport, sizeof(lower_transport),
616
                             ";,", &p);
617
                }
618
        } else if (!strcasecmp (transport_protocol, "x-pn-tng")) {
619
            /* x-pn-tng/<protocol> */
620
            get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
621
            profile[0] = '\0';
622
        }
623
        if (!strcasecmp(lower_transport, "TCP"))
624
            th->protocol = RTSP_PROTOCOL_RTP_TCP;
625
        else
626
            th->protocol = RTSP_PROTOCOL_RTP_UDP;
627

    
628
        if (*p == ';')
629
            p++;
630
        /* get each parameter */
631
        while (*p != '\0' && *p != ',') {
632
            get_word_sep(parameter, sizeof(parameter), "=;,", &p);
633
            if (!strcmp(parameter, "port")) {
634
                if (*p == '=') {
635
                    p++;
636
                    rtsp_parse_range(&th->port_min, &th->port_max, &p);
637
                }
638
            } else if (!strcmp(parameter, "client_port")) {
639
                if (*p == '=') {
640
                    p++;
641
                    rtsp_parse_range(&th->client_port_min,
642
                                     &th->client_port_max, &p);
643
                }
644
            } else if (!strcmp(parameter, "server_port")) {
645
                if (*p == '=') {
646
                    p++;
647
                    rtsp_parse_range(&th->server_port_min,
648
                                     &th->server_port_max, &p);
649
                }
650
            } else if (!strcmp(parameter, "interleaved")) {
651
                if (*p == '=') {
652
                    p++;
653
                    rtsp_parse_range(&th->interleaved_min,
654
                                     &th->interleaved_max, &p);
655
                }
656
            } else if (!strcmp(parameter, "multicast")) {
657
                if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
658
                    th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
659
            } else if (!strcmp(parameter, "ttl")) {
660
                if (*p == '=') {
661
                    p++;
662
                    th->ttl = strtol(p, (char **)&p, 10);
663
                }
664
            } else if (!strcmp(parameter, "destination")) {
665
                struct in_addr ipaddr;
666

    
667
                if (*p == '=') {
668
                    p++;
669
                    get_word_sep(buf, sizeof(buf), ";,", &p);
670
                    if (inet_aton(buf, &ipaddr))
671
                        th->destination = ntohl(ipaddr.s_addr);
672
                }
673
            }
674
            while (*p != ';' && *p != '\0' && *p != ',')
675
                p++;
676
            if (*p == ';')
677
                p++;
678
        }
679
        if (*p == ',')
680
            p++;
681

    
682
        reply->nb_transports++;
683
    }
684
}
685

    
686
void rtsp_parse_line(RTSPHeader *reply, const char *buf)
687
{
688
    const char *p;
689

    
690
    /* NOTE: we do case independent match for broken servers */
691
    p = buf;
692
    if (av_stristart(p, "Session:", &p)) {
693
        get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
694
    } else if (av_stristart(p, "Content-Length:", &p)) {
695
        reply->content_length = strtol(p, NULL, 10);
696
    } else if (av_stristart(p, "Transport:", &p)) {
697
        rtsp_parse_transport(reply, p);
698
    } else if (av_stristart(p, "CSeq:", &p)) {
699
        reply->seq = strtol(p, NULL, 10);
700
    } else if (av_stristart(p, "Range:", &p)) {
701
        rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
702
    }
703
}
704

    
705
static int url_readbuf(URLContext *h, unsigned char *buf, int size)
706
{
707
    int ret, len;
708

    
709
    len = 0;
710
    while (len < size) {
711
        ret = url_read(h, buf+len, size-len);
712
        if (ret < 1)
713
            return ret;
714
        len += ret;
715
    }
716
    return len;
717
}
718

    
719
/* skip a RTP/TCP interleaved packet */
720
static void rtsp_skip_packet(AVFormatContext *s)
721
{
722
    RTSPState *rt = s->priv_data;
723
    int ret, len, len1;
724
    uint8_t buf[1024];
725

    
726
    ret = url_readbuf(rt->rtsp_hd, buf, 3);
727
    if (ret != 3)
728
        return;
729
    len = AV_RB16(buf + 1);
730
#ifdef DEBUG
731
    printf("skipping RTP packet len=%d\n", len);
732
#endif
733
    /* skip payload */
734
    while (len > 0) {
735
        len1 = len;
736
        if (len1 > sizeof(buf))
737
            len1 = sizeof(buf);
738
        ret = url_readbuf(rt->rtsp_hd, buf, len1);
739
        if (ret != len1)
740
            return;
741
        len -= len1;
742
    }
743
}
744

    
745
static void rtsp_send_cmd(AVFormatContext *s,
746
                          const char *cmd, RTSPHeader *reply,
747
                          unsigned char **content_ptr)
748
{
749
    RTSPState *rt = s->priv_data;
750
    char buf[4096], buf1[1024], *q;
751
    unsigned char ch;
752
    const char *p;
753
    int content_length, line_count;
754
    unsigned char *content = NULL;
755

    
756
    memset(reply, 0, sizeof(RTSPHeader));
757

    
758
    rt->seq++;
759
    av_strlcpy(buf, cmd, sizeof(buf));
760
    snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
761
    av_strlcat(buf, buf1, sizeof(buf));
762
    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
763
        snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
764
        av_strlcat(buf, buf1, sizeof(buf));
765
    }
766
    av_strlcat(buf, "\r\n", sizeof(buf));
767
#ifdef DEBUG
768
    printf("Sending:\n%s--\n", buf);
769
#endif
770
    url_write(rt->rtsp_hd, buf, strlen(buf));
771

    
772
    /* parse reply (XXX: use buffers) */
773
    line_count = 0;
774
    rt->last_reply[0] = '\0';
775
    for(;;) {
776
        q = buf;
777
        for(;;) {
778
            if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
779
                break;
780
            if (ch == '\n')
781
                break;
782
            if (ch == '$') {
783
                /* XXX: only parse it if first char on line ? */
784
                rtsp_skip_packet(s);
785
            } else if (ch != '\r') {
786
                if ((q - buf) < sizeof(buf) - 1)
787
                    *q++ = ch;
788
            }
789
        }
790
        *q = '\0';
791
#ifdef DEBUG
792
        printf("line='%s'\n", buf);
793
#endif
794
        /* test if last line */
795
        if (buf[0] == '\0')
796
            break;
797
        p = buf;
798
        if (line_count == 0) {
799
            /* get reply code */
800
            get_word(buf1, sizeof(buf1), &p);
801
            get_word(buf1, sizeof(buf1), &p);
802
            reply->status_code = atoi(buf1);
803
        } else {
804
            rtsp_parse_line(reply, p);
805
            av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
806
            av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
807
        }
808
        line_count++;
809
    }
810

    
811
    if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
812
        av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
813

    
814
    content_length = reply->content_length;
815
    if (content_length > 0) {
816
        /* leave some room for a trailing '\0' (useful for simple parsing) */
817
        content = av_malloc(content_length + 1);
818
        (void)url_readbuf(rt->rtsp_hd, content, content_length);
819
        content[content_length] = '\0';
820
    }
821
    if (content_ptr)
822
        *content_ptr = content;
823
    else
824
        av_free(content);
825
}
826

    
827

    
828
/* close and free RTSP streams */
829
static void rtsp_close_streams(RTSPState *rt)
830
{
831
    int i;
832
    RTSPStream *rtsp_st;
833

    
834
    for(i=0;i<rt->nb_rtsp_streams;i++) {
835
        rtsp_st = rt->rtsp_streams[i];
836
        if (rtsp_st) {
837
            if (rtsp_st->rtp_ctx)
838
                rtp_parse_close(rtsp_st->rtp_ctx);
839
            if (rtsp_st->rtp_handle)
840
                url_close(rtsp_st->rtp_handle);
841
            if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
842
                rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
843
        }
844
        av_free(rtsp_st);
845
    }
846
    av_free(rt->rtsp_streams);
847
}
848

    
849
/**
850
 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
851
 */
852
static int
853
make_setup_request (AVFormatContext *s, const char *host, int port, int protocol_mask)
854
{
855
    RTSPState *rt = s->priv_data;
856
    int j, i, err;
857
    RTSPStream *rtsp_st;
858
    AVStream *st;
859
    RTSPHeader reply1, *reply = &reply1;
860
    char cmd[2048];
861

    
862
    /* for each stream, make the setup request */
863
    /* XXX: we assume the same server is used for the control of each
864
       RTSP stream */
865

    
866
    for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
867
        char transport[2048];
868

    
869
        rtsp_st = rt->rtsp_streams[i];
870

    
871
        /* compute available transports */
872
        transport[0] = '\0';
873

    
874
        /* RTP/UDP */
875
        if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
876
            char buf[256];
877

    
878
            /* first try in specified port range */
879
            if (RTSP_RTP_PORT_MIN != 0) {
880
                while(j <= RTSP_RTP_PORT_MAX) {
881
                    snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
882
                    j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
883
                    if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
884
                        goto rtp_opened;
885
                    }
886
                }
887
            }
888

    
889
/*            then try on any port
890
**            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
891
**                err = AVERROR_INVALIDDATA;
892
**                goto fail;
893
**            }
894
*/
895

    
896
        rtp_opened:
897
            port = rtp_get_local_port(rtsp_st->rtp_handle);
898
            if (transport[0] != '\0')
899
                av_strlcat(transport, ",", sizeof(transport));
900
            snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
901
                     "RTP/AVP/UDP;unicast;client_port=%d-%d",
902
                     port, port + 1);
903
        }
904

    
905
        /* RTP/TCP */
906
        else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
907
            if (transport[0] != '\0')
908
                av_strlcat(transport, ",", sizeof(transport));
909
            snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
910
                     "RTP/AVP/TCP");
911
        }
912

    
913
        else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
914
            if (transport[0] != '\0')
915
                av_strlcat(transport, ",", sizeof(transport));
916
            snprintf(transport + strlen(transport),
917
                     sizeof(transport) - strlen(transport) - 1,
918
                     "RTP/AVP/UDP;multicast");
919
        }
920
        snprintf(cmd, sizeof(cmd),
921
                 "SETUP %s RTSP/1.0\r\n"
922
                 "Transport: %s\r\n",
923
                 rtsp_st->control_url, transport);
924
        rtsp_send_cmd(s, cmd, reply, NULL);
925
        if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
926
            err = 1;
927
            goto fail;
928
        } else
929
        if (reply->status_code != RTSP_STATUS_OK ||
930
            reply->nb_transports != 1) {
931
            err = AVERROR_INVALIDDATA;
932
            goto fail;
933
        }
934

    
935
        /* XXX: same protocol for all streams is required */
936
        if (i > 0) {
937
            if (reply->transports[0].protocol != rt->protocol) {
938
                err = AVERROR_INVALIDDATA;
939
                goto fail;
940
            }
941
        } else {
942
            rt->protocol = reply->transports[0].protocol;
943
        }
944

    
945
        /* close RTP connection if not choosen */
946
        if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
947
            (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
948
            url_close(rtsp_st->rtp_handle);
949
            rtsp_st->rtp_handle = NULL;
950
        }
951

    
952
        switch(reply->transports[0].protocol) {
953
        case RTSP_PROTOCOL_RTP_TCP:
954
            rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
955
            rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
956
            break;
957

    
958
        case RTSP_PROTOCOL_RTP_UDP:
959
            {
960
                char url[1024];
961

    
962
                /* XXX: also use address if specified */
963
                snprintf(url, sizeof(url), "rtp://%s:%d",
964
                         host, reply->transports[0].server_port_min);
965
                if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
966
                    err = AVERROR_INVALIDDATA;
967
                    goto fail;
968
                }
969
            }
970
            break;
971
        case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
972
            {
973
                char url[1024];
974
                struct in_addr in;
975

    
976
                in.s_addr = htonl(reply->transports[0].destination);
977
                snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
978
                         inet_ntoa(in),
979
                         reply->transports[0].port_min,
980
                         reply->transports[0].ttl);
981
                if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
982
                    err = AVERROR_INVALIDDATA;
983
                    goto fail;
984
                }
985
            }
986
            break;
987
        }
988
        /* open the RTP context */
989
        st = NULL;
990
        if (rtsp_st->stream_index >= 0)
991
            st = s->streams[rtsp_st->stream_index];
992
        if (!st)
993
            s->ctx_flags |= AVFMTCTX_NOHEADER;
994
        rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
995

    
996
        if (!rtsp_st->rtp_ctx) {
997
            err = AVERROR(ENOMEM);
998
            goto fail;
999
        } else {
1000
            if(rtsp_st->dynamic_handler) {
1001
                rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1002
                rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1003
            }
1004
        }
1005
    }
1006

    
1007
    return 0;
1008

    
1009
fail:
1010
    for (i=0; i<rt->nb_rtsp_streams; i++) {
1011
        if (rt->rtsp_streams[i]->rtp_handle) {
1012
            url_close(rt->rtsp_streams[i]->rtp_handle);
1013
            rt->rtsp_streams[i]->rtp_handle = NULL;
1014
        }
1015
    }
1016
    return err;
1017
}
1018

    
1019
static int rtsp_read_header(AVFormatContext *s,
1020
                            AVFormatParameters *ap)
1021
{
1022
    RTSPState *rt = s->priv_data;
1023
    char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1024
    URLContext *rtsp_hd;
1025
    int port, ret, err;
1026
    RTSPHeader reply1, *reply = &reply1;
1027
    unsigned char *content = NULL;
1028
    int protocol_mask = 0;
1029

    
1030
    /* extract hostname and port */
1031
    url_split(NULL, 0, NULL, 0,
1032
              host, sizeof(host), &port, path, sizeof(path), s->filename);
1033
    if (port < 0)
1034
        port = RTSP_DEFAULT_PORT;
1035

    
1036
    /* search for options */
1037
    option_list = strchr(path, '?');
1038
    if (option_list) {
1039
        /* remove the options from the path */
1040
        *option_list++ = 0;
1041
        while(option_list) {
1042
            /* move the option pointer */
1043
            option = option_list;
1044
            option_list = strchr(option_list, '&');
1045
            if (option_list)
1046
                *(option_list++) = 0;
1047
            /* handle the options */
1048
            if (strcmp(option, "udp") == 0)
1049
                protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
1050
            else if (strcmp(option, "multicast") == 0)
1051
                protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
1052
            else if (strcmp(option, "tcp") == 0)
1053
                protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
1054
        }
1055
    }
1056

    
1057
    if (!protocol_mask)
1058
        protocol_mask = (1 << RTSP_PROTOCOL_RTP_LAST) - 1;
1059

    
1060
    /* open the tcp connexion */
1061
    snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1062
    if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1063
        return AVERROR(EIO);
1064
    rt->rtsp_hd = rtsp_hd;
1065
    rt->seq = 0;
1066

    
1067
    /* describe the stream */
1068
    snprintf(cmd, sizeof(cmd),
1069
             "DESCRIBE %s RTSP/1.0\r\n"
1070
             "Accept: application/sdp\r\n",
1071
             s->filename);
1072
    rtsp_send_cmd(s, cmd, reply, &content);
1073
    if (!content) {
1074
        err = AVERROR_INVALIDDATA;
1075
        goto fail;
1076
    }
1077
    if (reply->status_code != RTSP_STATUS_OK) {
1078
        err = AVERROR_INVALIDDATA;
1079
        goto fail;
1080
    }
1081

    
1082
    /* now we got the SDP description, we parse it */
1083
    ret = sdp_parse(s, (const char *)content);
1084
    av_freep(&content);
1085
    if (ret < 0) {
1086
        err = AVERROR_INVALIDDATA;
1087
        goto fail;
1088
    }
1089

    
1090
    do {
1091
        int protocol = protocol_mask & ~(protocol_mask - 1);
1092

    
1093
        err = make_setup_request(s, host, port, protocol);
1094
        if (err < 0)
1095
        goto fail;
1096
        protocol_mask &= ~protocol;
1097
        if (protocol_mask == 0 && err == 1) {
1098
            err = AVERROR(EPROTONOSUPPORT);
1099
            goto fail;
1100
        }
1101
    } while (err);
1102

    
1103
    rt->state = RTSP_STATE_IDLE;
1104
    rt->seek_timestamp = 0; /* default is to start stream at position
1105
                               zero */
1106
    if (ap->initial_pause) {
1107
        /* do not start immediately */
1108
    } else {
1109
        if (rtsp_read_play(s) < 0) {
1110
            err = AVERROR_INVALIDDATA;
1111
            goto fail;
1112
        }
1113
    }
1114
    return 0;
1115
 fail:
1116
    rtsp_close_streams(rt);
1117
    av_freep(&content);
1118
    url_close(rt->rtsp_hd);
1119
    return err;
1120
}
1121

    
1122
static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1123
                           uint8_t *buf, int buf_size)
1124
{
1125
    RTSPState *rt = s->priv_data;
1126
    int id, len, i, ret;
1127
    RTSPStream *rtsp_st;
1128

    
1129
#ifdef DEBUG_RTP_TCP
1130
    printf("tcp_read_packet:\n");
1131
#endif
1132
 redo:
1133
    for(;;) {
1134
        ret = url_readbuf(rt->rtsp_hd, buf, 1);
1135
#ifdef DEBUG_RTP_TCP
1136
        printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1137
#endif
1138
        if (ret != 1)
1139
            return -1;
1140
        if (buf[0] == '$')
1141
            break;
1142
    }
1143
    ret = url_readbuf(rt->rtsp_hd, buf, 3);
1144
    if (ret != 3)
1145
        return -1;
1146
    id = buf[0];
1147
    len = AV_RB16(buf + 1);
1148
#ifdef DEBUG_RTP_TCP
1149
    printf("id=%d len=%d\n", id, len);
1150
#endif
1151
    if (len > buf_size || len < 12)
1152
        goto redo;
1153
    /* get the data */
1154
    ret = url_readbuf(rt->rtsp_hd, buf, len);
1155
    if (ret != len)
1156
        return -1;
1157

    
1158
    /* find the matching stream */
1159
    for(i = 0; i < rt->nb_rtsp_streams; i++) {
1160
        rtsp_st = rt->rtsp_streams[i];
1161
        if (id >= rtsp_st->interleaved_min &&
1162
            id <= rtsp_st->interleaved_max)
1163
            goto found;
1164
    }
1165
    goto redo;
1166
 found:
1167
    *prtsp_st = rtsp_st;
1168
    return len;
1169
}
1170

    
1171
static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1172
                           uint8_t *buf, int buf_size)
1173
{
1174
    RTSPState *rt = s->priv_data;
1175
    RTSPStream *rtsp_st;
1176
    fd_set rfds;
1177
    int fd1, fd2, fd_max, n, i, ret;
1178
    struct timeval tv;
1179

    
1180
    for(;;) {
1181
        if (url_interrupt_cb())
1182
            return AVERROR(EINTR);
1183
        FD_ZERO(&rfds);
1184
        fd_max = -1;
1185
        for(i = 0; i < rt->nb_rtsp_streams; i++) {
1186
            rtsp_st = rt->rtsp_streams[i];
1187
            /* currently, we cannot probe RTCP handle because of blocking restrictions */
1188
            rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1189
            if (fd1 > fd_max)
1190
                fd_max = fd1;
1191
            FD_SET(fd1, &rfds);
1192
        }
1193
        tv.tv_sec = 0;
1194
        tv.tv_usec = 100 * 1000;
1195
        n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1196
        if (n > 0) {
1197
            for(i = 0; i < rt->nb_rtsp_streams; i++) {
1198
                rtsp_st = rt->rtsp_streams[i];
1199
                rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1200
                if (FD_ISSET(fd1, &rfds)) {
1201
                    ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1202
                    if (ret > 0) {
1203
                        *prtsp_st = rtsp_st;
1204
                        return ret;
1205
                    }
1206
                }
1207
            }
1208
        }
1209
    }
1210
}
1211

    
1212
static int rtsp_read_packet(AVFormatContext *s,
1213
                            AVPacket *pkt)
1214
{
1215
    RTSPState *rt = s->priv_data;
1216
    RTSPStream *rtsp_st;
1217
    int ret, len;
1218
    uint8_t buf[RTP_MAX_PACKET_LENGTH];
1219

    
1220
    /* get next frames from the same RTP packet */
1221
    if (rt->cur_rtp) {
1222
        ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1223
        if (ret == 0) {
1224
            rt->cur_rtp = NULL;
1225
            return 0;
1226
        } else if (ret == 1) {
1227
            return 0;
1228
        } else {
1229
            rt->cur_rtp = NULL;
1230
        }
1231
    }
1232

    
1233
    /* read next RTP packet */
1234
 redo:
1235
    switch(rt->protocol) {
1236
    default:
1237
    case RTSP_PROTOCOL_RTP_TCP:
1238
        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1239
        break;
1240
    case RTSP_PROTOCOL_RTP_UDP:
1241
    case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1242
        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1243
        if (len >=0 && rtsp_st->rtp_ctx)
1244
            rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1245
        break;
1246
    }
1247
    if (len < 0)
1248
        return len;
1249
    ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1250
    if (ret < 0)
1251
        goto redo;
1252
    if (ret == 1) {
1253
        /* more packets may follow, so we save the RTP context */
1254
        rt->cur_rtp = rtsp_st->rtp_ctx;
1255
    }
1256
    return 0;
1257
}
1258

    
1259
static int rtsp_read_play(AVFormatContext *s)
1260
{
1261
    RTSPState *rt = s->priv_data;
1262
    RTSPHeader reply1, *reply = &reply1;
1263
    char cmd[1024];
1264

    
1265
    av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1266

    
1267
    if (rt->state == RTSP_STATE_PAUSED) {
1268
        snprintf(cmd, sizeof(cmd),
1269
                 "PLAY %s RTSP/1.0\r\n",
1270
                 s->filename);
1271
    } else {
1272
        snprintf(cmd, sizeof(cmd),
1273
                 "PLAY %s RTSP/1.0\r\n"
1274
                 "Range: npt=%0.3f-\r\n",
1275
                 s->filename,
1276
                 (double)rt->seek_timestamp / AV_TIME_BASE);
1277
    }
1278
    rtsp_send_cmd(s, cmd, reply, NULL);
1279
    if (reply->status_code != RTSP_STATUS_OK) {
1280
        return -1;
1281
    } else {
1282
        rt->state = RTSP_STATE_PLAYING;
1283
        return 0;
1284
    }
1285
}
1286

    
1287
/* pause the stream */
1288
static int rtsp_read_pause(AVFormatContext *s)
1289
{
1290
    RTSPState *rt = s->priv_data;
1291
    RTSPHeader reply1, *reply = &reply1;
1292
    char cmd[1024];
1293

    
1294
    rt = s->priv_data;
1295

    
1296
    if (rt->state != RTSP_STATE_PLAYING)
1297
        return 0;
1298

    
1299
    snprintf(cmd, sizeof(cmd),
1300
             "PAUSE %s RTSP/1.0\r\n",
1301
             s->filename);
1302
    rtsp_send_cmd(s, cmd, reply, NULL);
1303
    if (reply->status_code != RTSP_STATUS_OK) {
1304
        return -1;
1305
    } else {
1306
        rt->state = RTSP_STATE_PAUSED;
1307
        return 0;
1308
    }
1309
}
1310

    
1311
static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1312
                          int64_t timestamp, int flags)
1313
{
1314
    RTSPState *rt = s->priv_data;
1315

    
1316
    rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1317
    switch(rt->state) {
1318
    default:
1319
    case RTSP_STATE_IDLE:
1320
        break;
1321
    case RTSP_STATE_PLAYING:
1322
        if (rtsp_read_play(s) != 0)
1323
            return -1;
1324
        break;
1325
    case RTSP_STATE_PAUSED:
1326
        rt->state = RTSP_STATE_IDLE;
1327
        break;
1328
    }
1329
    return 0;
1330
}
1331

    
1332
static int rtsp_read_close(AVFormatContext *s)
1333
{
1334
    RTSPState *rt = s->priv_data;
1335
    RTSPHeader reply1, *reply = &reply1;
1336
    char cmd[1024];
1337

    
1338
#if 0
1339
    /* NOTE: it is valid to flush the buffer here */
1340
    if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1341
        url_fclose(&rt->rtsp_gb);
1342
    }
1343
#endif
1344
    snprintf(cmd, sizeof(cmd),
1345
             "TEARDOWN %s RTSP/1.0\r\n",
1346
             s->filename);
1347
    rtsp_send_cmd(s, cmd, reply, NULL);
1348

    
1349
    rtsp_close_streams(rt);
1350
    url_close(rt->rtsp_hd);
1351
    return 0;
1352
}
1353

    
1354
#ifdef CONFIG_RTSP_DEMUXER
1355
AVInputFormat rtsp_demuxer = {
1356
    "rtsp",
1357
    "RTSP input format",
1358
    sizeof(RTSPState),
1359
    rtsp_probe,
1360
    rtsp_read_header,
1361
    rtsp_read_packet,
1362
    rtsp_read_close,
1363
    rtsp_read_seek,
1364
    .flags = AVFMT_NOFILE,
1365
    .read_play = rtsp_read_play,
1366
    .read_pause = rtsp_read_pause,
1367
};
1368
#endif
1369

    
1370
static int sdp_probe(AVProbeData *p1)
1371
{
1372
    const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1373

    
1374
    /* we look for a line beginning "c=IN IP4" */
1375
    while (p < p_end && *p != '\0') {
1376
        if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1377
            return AVPROBE_SCORE_MAX / 2;
1378

    
1379
        while(p < p_end - 1 && *p != '\n') p++;
1380
        if (++p >= p_end)
1381
            break;
1382
        if (*p == '\r')
1383
            p++;
1384
    }
1385
    return 0;
1386
}
1387

    
1388
#define SDP_MAX_SIZE 8192
1389

    
1390
static int sdp_read_header(AVFormatContext *s,
1391
                           AVFormatParameters *ap)
1392
{
1393
    RTSPState *rt = s->priv_data;
1394
    RTSPStream *rtsp_st;
1395
    int size, i, err;
1396
    char *content;
1397
    char url[1024];
1398
    AVStream *st;
1399

    
1400
    /* read the whole sdp file */
1401
    /* XXX: better loading */
1402
    content = av_malloc(SDP_MAX_SIZE);
1403
    size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1404
    if (size <= 0) {
1405
        av_free(content);
1406
        return AVERROR_INVALIDDATA;
1407
    }
1408
    content[size] ='\0';
1409

    
1410
    sdp_parse(s, content);
1411
    av_free(content);
1412

    
1413
    /* open each RTP stream */
1414
    for(i=0;i<rt->nb_rtsp_streams;i++) {
1415
        rtsp_st = rt->rtsp_streams[i];
1416

    
1417
        snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1418
                 inet_ntoa(rtsp_st->sdp_ip),
1419
                 rtsp_st->sdp_port,
1420
                 rtsp_st->sdp_ttl);
1421
        if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1422
            err = AVERROR_INVALIDDATA;
1423
            goto fail;
1424
        }
1425
        /* open the RTP context */
1426
        st = NULL;
1427
        if (rtsp_st->stream_index >= 0)
1428
            st = s->streams[rtsp_st->stream_index];
1429
        if (!st)
1430
            s->ctx_flags |= AVFMTCTX_NOHEADER;
1431
        rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1432
        if (!rtsp_st->rtp_ctx) {
1433
            err = AVERROR(ENOMEM);
1434
            goto fail;
1435
        } else {
1436
            if(rtsp_st->dynamic_handler) {
1437
                rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1438
                rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1439
            }
1440
        }
1441
    }
1442
    return 0;
1443
 fail:
1444
    rtsp_close_streams(rt);
1445
    return err;
1446
}
1447

    
1448
static int sdp_read_packet(AVFormatContext *s,
1449
                            AVPacket *pkt)
1450
{
1451
    return rtsp_read_packet(s, pkt);
1452
}
1453

    
1454
static int sdp_read_close(AVFormatContext *s)
1455
{
1456
    RTSPState *rt = s->priv_data;
1457
    rtsp_close_streams(rt);
1458
    return 0;
1459
}
1460

    
1461
#ifdef CONFIG_SDP_DEMUXER
1462
AVInputFormat sdp_demuxer = {
1463
    "sdp",
1464
    "SDP",
1465
    sizeof(RTSPState),
1466
    sdp_probe,
1467
    sdp_read_header,
1468
    sdp_read_packet,
1469
    sdp_read_close,
1470
};
1471
#endif
1472

    
1473
#ifdef CONFIG_REDIR_DEMUXER
1474
/* dummy redirector format (used directly in av_open_input_file now) */
1475
static int redir_probe(AVProbeData *pd)
1476
{
1477
    const char *p;
1478
    p = pd->buf;
1479
    while (redir_isspace(*p))
1480
        p++;
1481
    if (av_strstart(p, "http://", NULL) ||
1482
        av_strstart(p, "rtsp://", NULL))
1483
        return AVPROBE_SCORE_MAX;
1484
    return 0;
1485
}
1486

    
1487
static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1488
{
1489
    char buf[4096], *q;
1490
    int c;
1491
    AVFormatContext *ic = NULL;
1492
    ByteIOContext *f = s->pb;
1493

    
1494
    /* parse each URL and try to open it */
1495
    c = url_fgetc(f);
1496
    while (c != URL_EOF) {
1497
        /* skip spaces */
1498
        for(;;) {
1499
            if (!redir_isspace(c))
1500
                break;
1501
            c = url_fgetc(f);
1502
        }
1503
        if (c == URL_EOF)
1504
            break;
1505
        /* record url */
1506
        q = buf;
1507
        for(;;) {
1508
            if (c == URL_EOF || redir_isspace(c))
1509
                break;
1510
            if ((q - buf) < sizeof(buf) - 1)
1511
                *q++ = c;
1512
            c = url_fgetc(f);
1513
        }
1514
        *q = '\0';
1515
        //printf("URL='%s'\n", buf);
1516
        /* try to open the media file */
1517
        if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1518
            break;
1519
    }
1520
    if (!ic)
1521
        return AVERROR(EIO);
1522

    
1523
    *s = *ic;
1524
    url_fclose(f);
1525

    
1526
    return 0;
1527
}
1528

    
1529
AVInputFormat redir_demuxer = {
1530
    "redir",
1531
    "Redirector format",
1532
    0,
1533
    redir_probe,
1534
    redir_read_header,
1535
    NULL,
1536
    NULL,
1537
};
1538
#endif