14f0a5ce43a0dfb88c96754bb12f1904de459ba8
[libav.git] / libavformat / rtsp.c
1 /*
2 * RTSP/SDP client
3 * Copyright (c) 2002 Fabrice Bellard.
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21 #include "avformat.h"
22
23 #include <sys/time.h>
24 #include <unistd.h> /* for select() prototype */
25 #include "network.h"
26 #include "avstring.h"
27 #include "rtsp.h"
28
29 #include "rtp_internal.h"
30
31 //#define DEBUG
32 //#define DEBUG_RTP_TCP
33
34 enum RTSPClientState {
35 RTSP_STATE_IDLE,
36 RTSP_STATE_PLAYING,
37 RTSP_STATE_PAUSED,
38 };
39
40 typedef struct RTSPState {
41 URLContext *rtsp_hd; /* RTSP TCP connexion handle */
42 int nb_rtsp_streams;
43 struct RTSPStream **rtsp_streams;
44
45 enum RTSPClientState state;
46 int64_t seek_timestamp;
47
48 /* XXX: currently we use unbuffered input */
49 // ByteIOContext rtsp_gb;
50 int seq; /* RTSP command sequence number */
51 char session_id[512];
52 enum RTSPProtocol protocol;
53 char last_reply[2048]; /* XXX: allocate ? */
54 RTPDemuxContext *cur_rtp;
55 } RTSPState;
56
57 typedef struct RTSPStream {
58 URLContext *rtp_handle; /* RTP stream handle */
59 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 */
63 char control_url[1024]; /* url for this stream (from SDP) */
64
65 int sdp_port; /* port (from SDP content - not used in RTSP) */
66 struct in_addr sdp_ip; /* IP address (from SDP content - not used in RTSP) */
67 int sdp_ttl; /* IP TTL (from SDP content - not used in RTSP) */
68 int sdp_payload_type; /* payload type - only used in SDP */
69 rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
70
71 RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
72 void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
73 } RTSPStream;
74
75 static int rtsp_read_play(AVFormatContext *s);
76
77 /* XXX: currently, the only way to change the protocols consists in
78 changing this variable */
79
80 #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;
124 }
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 static int rtsp_read_header(AVFormatContext *s,
850 AVFormatParameters *ap)
851 {
852 RTSPState *rt = s->priv_data;
853 char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
854 URLContext *rtsp_hd;
855 int port, i, j, ret, err;
856 RTSPHeader reply1, *reply = &reply1;
857 unsigned char *content = NULL;
858 RTSPStream *rtsp_st;
859 int protocol_mask = 0;
860 AVStream *st;
861
862 /* extract hostname and port */
863 url_split(NULL, 0, NULL, 0,
864 host, sizeof(host), &port, path, sizeof(path), s->filename);
865 if (port < 0)
866 port = RTSP_DEFAULT_PORT;
867
868 /* search for options */
869 option_list = strchr(path, '?');
870 if (option_list) {
871 /* remove the options from the path */
872 *option_list++ = 0;
873 while(option_list) {
874 /* move the option pointer */
875 option = option_list;
876 option_list = strchr(option_list, '&');
877 if (option_list)
878 *(option_list++) = 0;
879 /* handle the options */
880 if (strcmp(option, "udp") == 0)
881 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
882 else if (strcmp(option, "multicast") == 0)
883 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
884 else if (strcmp(option, "tcp") == 0)
885 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
886 }
887 }
888
889 if (!protocol_mask)
890 protocol_mask = rtsp_default_protocols;
891
892 /* open the tcp connexion */
893 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
894 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
895 return AVERROR(EIO);
896 rt->rtsp_hd = rtsp_hd;
897 rt->seq = 0;
898
899 /* describe the stream */
900 snprintf(cmd, sizeof(cmd),
901 "DESCRIBE %s RTSP/1.0\r\n"
902 "Accept: application/sdp\r\n",
903 s->filename);
904 rtsp_send_cmd(s, cmd, reply, &content);
905 if (!content) {
906 err = AVERROR_INVALIDDATA;
907 goto fail;
908 }
909 if (reply->status_code != RTSP_STATUS_OK) {
910 err = AVERROR_INVALIDDATA;
911 goto fail;
912 }
913
914 /* now we got the SDP description, we parse it */
915 ret = sdp_parse(s, (const char *)content);
916 av_freep(&content);
917 if (ret < 0) {
918 err = AVERROR_INVALIDDATA;
919 goto fail;
920 }
921
922 /* for each stream, make the setup request */
923 /* XXX: we assume the same server is used for the control of each
924 RTSP stream */
925
926 for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
927 char transport[2048];
928
929 rtsp_st = rt->rtsp_streams[i];
930
931 /* compute available transports */
932 transport[0] = '\0';
933
934 /* RTP/UDP */
935 if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
936 char buf[256];
937
938 /* first try in specified port range */
939 if (RTSP_RTP_PORT_MIN != 0) {
940 while(j <= RTSP_RTP_PORT_MAX) {
941 snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
942 j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
943 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
944 goto rtp_opened;
945 }
946 }
947 }
948
949 /* then try on any port
950 ** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
951 ** err = AVERROR_INVALIDDATA;
952 ** goto fail;
953 ** }
954 */
955
956 rtp_opened:
957 port = rtp_get_local_port(rtsp_st->rtp_handle);
958 if (transport[0] != '\0')
959 av_strlcat(transport, ",", sizeof(transport));
960 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
961 "RTP/AVP/UDP;unicast;client_port=%d-%d",
962 port, port + 1);
963 }
964
965 /* RTP/TCP */
966 else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
967 if (transport[0] != '\0')
968 av_strlcat(transport, ",", sizeof(transport));
969 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
970 "RTP/AVP/TCP");
971 }
972
973 else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
974 if (transport[0] != '\0')
975 av_strlcat(transport, ",", sizeof(transport));
976 snprintf(transport + strlen(transport),
977 sizeof(transport) - strlen(transport) - 1,
978 "RTP/AVP/UDP;multicast");
979 }
980 snprintf(cmd, sizeof(cmd),
981 "SETUP %s RTSP/1.0\r\n"
982 "Transport: %s\r\n",
983 rtsp_st->control_url, transport);
984 rtsp_send_cmd(s, cmd, reply, NULL);
985 if (reply->status_code != RTSP_STATUS_OK ||
986 reply->nb_transports != 1) {
987 err = AVERROR_INVALIDDATA;
988 goto fail;
989 }
990
991 /* XXX: same protocol for all streams is required */
992 if (i > 0) {
993 if (reply->transports[0].protocol != rt->protocol) {
994 err = AVERROR_INVALIDDATA;
995 goto fail;
996 }
997 } else {
998 rt->protocol = reply->transports[0].protocol;
999 }
1000
1001 /* close RTP connection if not choosen */
1002 if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
1003 (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
1004 url_close(rtsp_st->rtp_handle);
1005 rtsp_st->rtp_handle = NULL;
1006 }
1007
1008 switch(reply->transports[0].protocol) {
1009 case RTSP_PROTOCOL_RTP_TCP:
1010 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1011 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1012 break;
1013
1014 case RTSP_PROTOCOL_RTP_UDP:
1015 {
1016 char url[1024];
1017
1018 /* XXX: also use address if specified */
1019 snprintf(url, sizeof(url), "rtp://%s:%d",
1020 host, reply->transports[0].server_port_min);
1021 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1022 err = AVERROR_INVALIDDATA;
1023 goto fail;
1024 }
1025 }
1026 break;
1027 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1028 {
1029 char url[1024];
1030 struct in_addr in;
1031
1032 in.s_addr = htonl(reply->transports[0].destination);
1033 snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1034 inet_ntoa(in),
1035 reply->transports[0].port_min,
1036 reply->transports[0].ttl);
1037 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1038 err = AVERROR_INVALIDDATA;
1039 goto fail;
1040 }
1041 }
1042 break;
1043 }
1044 /* open the RTP context */
1045 st = NULL;
1046 if (rtsp_st->stream_index >= 0)
1047 st = s->streams[rtsp_st->stream_index];
1048 if (!st)
1049 s->ctx_flags |= AVFMTCTX_NOHEADER;
1050 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1051
1052 if (!rtsp_st->rtp_ctx) {
1053 err = AVERROR(ENOMEM);
1054 goto fail;
1055 } else {
1056 if(rtsp_st->dynamic_handler) {
1057 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1058 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1059 }
1060 }
1061 }
1062
1063 rt->state = RTSP_STATE_IDLE;
1064 rt->seek_timestamp = 0; /* default is to start stream at position
1065 zero */
1066 if (ap->initial_pause) {
1067 /* do not start immediately */
1068 } else {
1069 if (rtsp_read_play(s) < 0) {
1070 err = AVERROR_INVALIDDATA;
1071 goto fail;
1072 }
1073 }
1074 return 0;
1075 fail:
1076 rtsp_close_streams(rt);
1077 av_freep(&content);
1078 url_close(rt->rtsp_hd);
1079 return err;
1080 }
1081
1082 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1083 uint8_t *buf, int buf_size)
1084 {
1085 RTSPState *rt = s->priv_data;
1086 int id, len, i, ret;
1087 RTSPStream *rtsp_st;
1088
1089 #ifdef DEBUG_RTP_TCP
1090 printf("tcp_read_packet:\n");
1091 #endif
1092 redo:
1093 for(;;) {
1094 ret = url_readbuf(rt->rtsp_hd, buf, 1);
1095 #ifdef DEBUG_RTP_TCP
1096 printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1097 #endif
1098 if (ret != 1)
1099 return -1;
1100 if (buf[0] == '$')
1101 break;
1102 }
1103 ret = url_readbuf(rt->rtsp_hd, buf, 3);
1104 if (ret != 3)
1105 return -1;
1106 id = buf[0];
1107 len = AV_RB16(buf + 1);
1108 #ifdef DEBUG_RTP_TCP
1109 printf("id=%d len=%d\n", id, len);
1110 #endif
1111 if (len > buf_size || len < 12)
1112 goto redo;
1113 /* get the data */
1114 ret = url_readbuf(rt->rtsp_hd, buf, len);
1115 if (ret != len)
1116 return -1;
1117
1118 /* find the matching stream */
1119 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1120 rtsp_st = rt->rtsp_streams[i];
1121 if (id >= rtsp_st->interleaved_min &&
1122 id <= rtsp_st->interleaved_max)
1123 goto found;
1124 }
1125 goto redo;
1126 found:
1127 *prtsp_st = rtsp_st;
1128 return len;
1129 }
1130
1131 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1132 uint8_t *buf, int buf_size)
1133 {
1134 RTSPState *rt = s->priv_data;
1135 RTSPStream *rtsp_st;
1136 fd_set rfds;
1137 int fd1, fd2, fd_max, n, i, ret;
1138 struct timeval tv;
1139
1140 for(;;) {
1141 if (url_interrupt_cb())
1142 return AVERROR(EINTR);
1143 FD_ZERO(&rfds);
1144 fd_max = -1;
1145 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1146 rtsp_st = rt->rtsp_streams[i];
1147 /* currently, we cannot probe RTCP handle because of blocking restrictions */
1148 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1149 if (fd1 > fd_max)
1150 fd_max = fd1;
1151 FD_SET(fd1, &rfds);
1152 }
1153 tv.tv_sec = 0;
1154 tv.tv_usec = 100 * 1000;
1155 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1156 if (n > 0) {
1157 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1158 rtsp_st = rt->rtsp_streams[i];
1159 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1160 if (FD_ISSET(fd1, &rfds)) {
1161 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1162 if (ret > 0) {
1163 *prtsp_st = rtsp_st;
1164 return ret;
1165 }
1166 }
1167 }
1168 }
1169 }
1170 }
1171
1172 static int rtsp_read_packet(AVFormatContext *s,
1173 AVPacket *pkt)
1174 {
1175 RTSPState *rt = s->priv_data;
1176 RTSPStream *rtsp_st;
1177 int ret, len;
1178 uint8_t buf[RTP_MAX_PACKET_LENGTH];
1179
1180 /* get next frames from the same RTP packet */
1181 if (rt->cur_rtp) {
1182 ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1183 if (ret == 0) {
1184 rt->cur_rtp = NULL;
1185 return 0;
1186 } else if (ret == 1) {
1187 return 0;
1188 } else {
1189 rt->cur_rtp = NULL;
1190 }
1191 }
1192
1193 /* read next RTP packet */
1194 redo:
1195 switch(rt->protocol) {
1196 default:
1197 case RTSP_PROTOCOL_RTP_TCP:
1198 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1199 break;
1200 case RTSP_PROTOCOL_RTP_UDP:
1201 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1202 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1203 if (len >=0 && rtsp_st->rtp_ctx)
1204 rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1205 break;
1206 }
1207 if (len < 0)
1208 return len;
1209 ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1210 if (ret < 0)
1211 goto redo;
1212 if (ret == 1) {
1213 /* more packets may follow, so we save the RTP context */
1214 rt->cur_rtp = rtsp_st->rtp_ctx;
1215 }
1216 return 0;
1217 }
1218
1219 static int rtsp_read_play(AVFormatContext *s)
1220 {
1221 RTSPState *rt = s->priv_data;
1222 RTSPHeader reply1, *reply = &reply1;
1223 char cmd[1024];
1224
1225 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1226
1227 if (rt->state == RTSP_STATE_PAUSED) {
1228 snprintf(cmd, sizeof(cmd),
1229 "PLAY %s RTSP/1.0\r\n",
1230 s->filename);
1231 } else {
1232 snprintf(cmd, sizeof(cmd),
1233 "PLAY %s RTSP/1.0\r\n"
1234 "Range: npt=%0.3f-\r\n",
1235 s->filename,
1236 (double)rt->seek_timestamp / AV_TIME_BASE);
1237 }
1238 rtsp_send_cmd(s, cmd, reply, NULL);
1239 if (reply->status_code != RTSP_STATUS_OK) {
1240 return -1;
1241 } else {
1242 rt->state = RTSP_STATE_PLAYING;
1243 return 0;
1244 }
1245 }
1246
1247 /* pause the stream */
1248 static int rtsp_read_pause(AVFormatContext *s)
1249 {
1250 RTSPState *rt = s->priv_data;
1251 RTSPHeader reply1, *reply = &reply1;
1252 char cmd[1024];
1253
1254 rt = s->priv_data;
1255
1256 if (rt->state != RTSP_STATE_PLAYING)
1257 return 0;
1258
1259 snprintf(cmd, sizeof(cmd),
1260 "PAUSE %s RTSP/1.0\r\n",
1261 s->filename);
1262 rtsp_send_cmd(s, cmd, reply, NULL);
1263 if (reply->status_code != RTSP_STATUS_OK) {
1264 return -1;
1265 } else {
1266 rt->state = RTSP_STATE_PAUSED;
1267 return 0;
1268 }
1269 }
1270
1271 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1272 int64_t timestamp, int flags)
1273 {
1274 RTSPState *rt = s->priv_data;
1275
1276 rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1277 switch(rt->state) {
1278 default:
1279 case RTSP_STATE_IDLE:
1280 break;
1281 case RTSP_STATE_PLAYING:
1282 if (rtsp_read_play(s) != 0)
1283 return -1;
1284 break;
1285 case RTSP_STATE_PAUSED:
1286 rt->state = RTSP_STATE_IDLE;
1287 break;
1288 }
1289 return 0;
1290 }
1291
1292 static int rtsp_read_close(AVFormatContext *s)
1293 {
1294 RTSPState *rt = s->priv_data;
1295 RTSPHeader reply1, *reply = &reply1;
1296 char cmd[1024];
1297
1298 #if 0
1299 /* NOTE: it is valid to flush the buffer here */
1300 if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1301 url_fclose(&rt->rtsp_gb);
1302 }
1303 #endif
1304 snprintf(cmd, sizeof(cmd),
1305 "TEARDOWN %s RTSP/1.0\r\n",
1306 s->filename);
1307 rtsp_send_cmd(s, cmd, reply, NULL);
1308
1309 rtsp_close_streams(rt);
1310 url_close(rt->rtsp_hd);
1311 return 0;
1312 }
1313
1314 #ifdef CONFIG_RTSP_DEMUXER
1315 AVInputFormat rtsp_demuxer = {
1316 "rtsp",
1317 "RTSP input format",
1318 sizeof(RTSPState),
1319 rtsp_probe,
1320 rtsp_read_header,
1321 rtsp_read_packet,
1322 rtsp_read_close,
1323 rtsp_read_seek,
1324 .flags = AVFMT_NOFILE,
1325 .read_play = rtsp_read_play,
1326 .read_pause = rtsp_read_pause,
1327 };
1328 #endif
1329
1330 static int sdp_probe(AVProbeData *p1)
1331 {
1332 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1333
1334 /* we look for a line beginning "c=IN IP4" */
1335 while (p < p_end && *p != '\0') {
1336 if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1337 return AVPROBE_SCORE_MAX / 2;
1338
1339 while(p < p_end - 1 && *p != '\n') p++;
1340 if (++p >= p_end)
1341 break;
1342 if (*p == '\r')
1343 p++;
1344 }
1345 return 0;
1346 }
1347
1348 #define SDP_MAX_SIZE 8192
1349
1350 static int sdp_read_header(AVFormatContext *s,
1351 AVFormatParameters *ap)
1352 {
1353 RTSPState *rt = s->priv_data;
1354 RTSPStream *rtsp_st;
1355 int size, i, err;
1356 char *content;
1357 char url[1024];
1358 AVStream *st;
1359
1360 /* read the whole sdp file */
1361 /* XXX: better loading */
1362 content = av_malloc(SDP_MAX_SIZE);
1363 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1364 if (size <= 0) {
1365 av_free(content);
1366 return AVERROR_INVALIDDATA;
1367 }
1368 content[size] ='\0';
1369
1370 sdp_parse(s, content);
1371 av_free(content);
1372
1373 /* open each RTP stream */
1374 for(i=0;i<rt->nb_rtsp_streams;i++) {
1375 rtsp_st = rt->rtsp_streams[i];
1376
1377 snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1378 inet_ntoa(rtsp_st->sdp_ip),
1379 rtsp_st->sdp_port,
1380 rtsp_st->sdp_ttl);
1381 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1382 err = AVERROR_INVALIDDATA;
1383 goto fail;
1384 }
1385 /* open the RTP context */
1386 st = NULL;
1387 if (rtsp_st->stream_index >= 0)
1388 st = s->streams[rtsp_st->stream_index];
1389 if (!st)
1390 s->ctx_flags |= AVFMTCTX_NOHEADER;
1391 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1392 if (!rtsp_st->rtp_ctx) {
1393 err = AVERROR(ENOMEM);
1394 goto fail;
1395 } else {
1396 if(rtsp_st->dynamic_handler) {
1397 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1398 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1399 }
1400 }
1401 }
1402 return 0;
1403 fail:
1404 rtsp_close_streams(rt);
1405 return err;
1406 }
1407
1408 static int sdp_read_packet(AVFormatContext *s,
1409 AVPacket *pkt)
1410 {
1411 return rtsp_read_packet(s, pkt);
1412 }
1413
1414 static int sdp_read_close(AVFormatContext *s)
1415 {
1416 RTSPState *rt = s->priv_data;
1417 rtsp_close_streams(rt);
1418 return 0;
1419 }
1420
1421 #ifdef CONFIG_SDP_DEMUXER
1422 AVInputFormat sdp_demuxer = {
1423 "sdp",
1424 "SDP",
1425 sizeof(RTSPState),
1426 sdp_probe,
1427 sdp_read_header,
1428 sdp_read_packet,
1429 sdp_read_close,
1430 };
1431 #endif
1432
1433 #ifdef CONFIG_REDIR_DEMUXER
1434 /* dummy redirector format (used directly in av_open_input_file now) */
1435 static int redir_probe(AVProbeData *pd)
1436 {
1437 const char *p;
1438 p = pd->buf;
1439 while (redir_isspace(*p))
1440 p++;
1441 if (av_strstart(p, "http://", NULL) ||
1442 av_strstart(p, "rtsp://", NULL))
1443 return AVPROBE_SCORE_MAX;
1444 return 0;
1445 }
1446
1447 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1448 {
1449 char buf[4096], *q;
1450 int c;
1451 AVFormatContext *ic = NULL;
1452 ByteIOContext *f = s->pb;
1453
1454 /* parse each URL and try to open it */
1455 c = url_fgetc(f);
1456 while (c != URL_EOF) {
1457 /* skip spaces */
1458 for(;;) {
1459 if (!redir_isspace(c))
1460 break;
1461 c = url_fgetc(f);
1462 }
1463 if (c == URL_EOF)
1464 break;
1465 /* record url */
1466 q = buf;
1467 for(;;) {
1468 if (c == URL_EOF || redir_isspace(c))
1469 break;
1470 if ((q - buf) < sizeof(buf) - 1)
1471 *q++ = c;
1472 c = url_fgetc(f);
1473 }
1474 *q = '\0';
1475 //printf("URL='%s'\n", buf);
1476 /* try to open the media file */
1477 if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1478 break;
1479 }
1480 if (!ic)
1481 return AVERROR(EIO);
1482
1483 *s = *ic;
1484 url_fclose(f);
1485
1486 return 0;
1487 }
1488
1489 AVInputFormat redir_demuxer = {
1490 "redir",
1491 "Redirector format",
1492 0,
1493 redir_probe,
1494 redir_read_header,
1495 NULL,
1496 NULL,
1497 };
1498 #endif