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source: vbox/trunk/src/libs/ffmpeg-20060710/libavformat/rtsp.c@ 10184

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1/*
2 * RTSP/SDP client
3 * Copyright (c) 2002 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#include "avformat.h"
20
21#include <unistd.h> /* for select() prototype */
22#include <sys/time.h>
23#include <netinet/in.h>
24#include <sys/socket.h>
25#ifndef __BEOS__
26# include <arpa/inet.h>
27#else
28# include "barpainet.h"
29#endif
30
31//#define DEBUG
32//#define DEBUG_RTP_TCP
33
34enum RTSPClientState {
35 RTSP_STATE_IDLE,
36 RTSP_STATE_PLAYING,
37 RTSP_STATE_PAUSED,
38};
39
40typedef 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
57typedef 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} RTSPStream;
71
72static int rtsp_read_play(AVFormatContext *s);
73
74/* XXX: currently, the only way to change the protocols consists in
75 changing this variable */
76
77int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
78
79FFRTSPCallback *ff_rtsp_callback = NULL;
80
81static int rtsp_probe(AVProbeData *p)
82{
83 if (strstart(p->filename, "rtsp:", NULL))
84 return AVPROBE_SCORE_MAX;
85 return 0;
86}
87
88static int redir_isspace(int c)
89{
90 return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
91}
92
93static void skip_spaces(const char **pp)
94{
95 const char *p;
96 p = *pp;
97 while (redir_isspace(*p))
98 p++;
99 *pp = p;
100}
101
102static void get_word_sep(char *buf, int buf_size, const char *sep,
103 const char **pp)
104{
105 const char *p;
106 char *q;
107
108 p = *pp;
109 if (*p == '/')
110 p++;
111 skip_spaces(&p);
112 q = buf;
113 while (!strchr(sep, *p) && *p != '\0') {
114 if ((q - buf) < buf_size - 1)
115 *q++ = *p;
116 p++;
117 }
118 if (buf_size > 0)
119 *q = '\0';
120 *pp = p;
121}
122
123static void get_word(char *buf, int buf_size, const char **pp)
124{
125 const char *p;
126 char *q;
127
128 p = *pp;
129 skip_spaces(&p);
130 q = buf;
131 while (!redir_isspace(*p) && *p != '\0') {
132 if ((q - buf) < buf_size - 1)
133 *q++ = *p;
134 p++;
135 }
136 if (buf_size > 0)
137 *q = '\0';
138 *pp = p;
139}
140
141/* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
142 params>] */
143static int sdp_parse_rtpmap(AVCodecContext *codec, int payload_type, const char *p)
144{
145 char buf[256];
146 int i;
147 AVCodec *c;
148 const char *c_name;
149
150 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
151 see if we can handle this kind of payload */
152 get_word_sep(buf, sizeof(buf), "/", &p);
153 if (payload_type >= RTP_PT_PRIVATE) {
154 /* We are in dynmaic payload type case ... search into AVRtpDynamicPayloadTypes[] */
155 for (i = 0; AVRtpDynamicPayloadTypes[i].codec_id != CODEC_ID_NONE; ++i)
156 if (!strcmp(buf, AVRtpDynamicPayloadTypes[i].enc_name) && (codec->codec_type == AVRtpDynamicPayloadTypes[i].codec_type)) {
157 codec->codec_id = AVRtpDynamicPayloadTypes[i].codec_id;
158 break;
159 }
160 } else {
161 /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
162 /* search into AVRtpPayloadTypes[] */
163 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
164 if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec->codec_type == AVRtpPayloadTypes[i].codec_type)){
165 codec->codec_id = AVRtpPayloadTypes[i].codec_id;
166 break;
167 }
168 }
169
170 c = avcodec_find_decoder(codec->codec_id);
171 if (c && c->name)
172 c_name = c->name;
173 else
174 c_name = (char *)NULL;
175
176 if (c_name) {
177 get_word_sep(buf, sizeof(buf), "/", &p);
178 i = atoi(buf);
179 switch (codec->codec_type) {
180 case CODEC_TYPE_AUDIO:
181 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
182 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
183 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
184 if (i > 0) {
185 codec->sample_rate = i;
186 get_word_sep(buf, sizeof(buf), "/", &p);
187 i = atoi(buf);
188 if (i > 0)
189 codec->channels = i;
190 }
191 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
192 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
193 break;
194 case CODEC_TYPE_VIDEO:
195 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
196 break;
197 default:
198 break;
199 }
200 return 0;
201 }
202
203 return -1;
204}
205
206/* return the length and optionnaly the data */
207static int hex_to_data(uint8_t *data, const char *p)
208{
209 int c, len, v;
210
211 len = 0;
212 v = 1;
213 for(;;) {
214 skip_spaces(&p);
215 if (p == '\0')
216 break;
217 c = toupper((unsigned char)*p++);
218 if (c >= '0' && c <= '9')
219 c = c - '0';
220 else if (c >= 'A' && c <= 'F')
221 c = c - 'A' + 10;
222 else
223 break;
224 v = (v << 4) | c;
225 if (v & 0x100) {
226 if (data)
227 data[len] = v;
228 len++;
229 v = 1;
230 }
231 }
232 return len;
233}
234
235static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
236{
237 switch (codec->codec_id) {
238 case CODEC_ID_MPEG4:
239 case CODEC_ID_MPEG4AAC:
240 if (!strcmp(attr, "config")) {
241 /* decode the hexa encoded parameter */
242 int len = hex_to_data(NULL, value);
243 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
244 if (!codec->extradata)
245 return;
246 codec->extradata_size = len;
247 hex_to_data(codec->extradata, value);
248 }
249 break;
250 default:
251 break;
252 }
253 return;
254}
255
256typedef struct attrname_map
257{
258 const char *str;
259 uint16_t type;
260 uint32_t offset;
261} attrname_map_t;
262
263/* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
264#define ATTR_NAME_TYPE_INT 0
265#define ATTR_NAME_TYPE_STR 1
266static attrname_map_t attr_names[]=
267{
268 {"SizeLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
269 {"IndexLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
270 {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
271 {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
272 {"StreamType", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
273 {"mode", ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
274 {NULL, -1, -1},
275};
276
277/* parse a SDP line and save stream attributes */
278static void sdp_parse_fmtp(AVStream *st, const char *p)
279{
280 char attr[256];
281 char value[4096];
282 int i;
283
284 RTSPStream *rtsp_st = st->priv_data;
285 AVCodecContext *codec = st->codec;
286 rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
287
288 /* loop on each attribute */
289 for(;;) {
290 skip_spaces(&p);
291 if (*p == '\0')
292 break;
293 get_word_sep(attr, sizeof(attr), "=", &p);
294 if (*p == '=')
295 p++;
296 get_word_sep(value, sizeof(value), ";", &p);
297 if (*p == ';')
298 p++;
299 /* grab the codec extra_data from the config parameter of the fmtp line */
300 sdp_parse_fmtp_config(codec, attr, value);
301 /* Looking for a known attribute */
302 for (i = 0; attr_names[i].str; ++i) {
303 if (!strcasecmp(attr, attr_names[i].str)) {
304 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
305 *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
306 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
307 *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
308 }
309 }
310 }
311}
312
313typedef struct SDPParseState {
314 /* SDP only */
315 struct in_addr default_ip;
316 int default_ttl;
317} SDPParseState;
318
319static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
320 int letter, const char *buf)
321{
322 RTSPState *rt = s->priv_data;
323 char buf1[64], st_type[64];
324 const char *p;
325 int codec_type, payload_type, i;
326 AVStream *st;
327 RTSPStream *rtsp_st;
328 struct in_addr sdp_ip;
329 int ttl;
330
331#ifdef DEBUG
332 printf("sdp: %c='%s'\n", letter, buf);
333#endif
334
335 p = buf;
336 switch(letter) {
337 case 'c':
338 get_word(buf1, sizeof(buf1), &p);
339 if (strcmp(buf1, "IN") != 0)
340 return;
341 get_word(buf1, sizeof(buf1), &p);
342 if (strcmp(buf1, "IP4") != 0)
343 return;
344 get_word_sep(buf1, sizeof(buf1), "/", &p);
345 if (inet_aton(buf1, &sdp_ip) == 0)
346 return;
347 ttl = 16;
348 if (*p == '/') {
349 p++;
350 get_word_sep(buf1, sizeof(buf1), "/", &p);
351 ttl = atoi(buf1);
352 }
353 if (s->nb_streams == 0) {
354 s1->default_ip = sdp_ip;
355 s1->default_ttl = ttl;
356 } else {
357 st = s->streams[s->nb_streams - 1];
358 rtsp_st = st->priv_data;
359 rtsp_st->sdp_ip = sdp_ip;
360 rtsp_st->sdp_ttl = ttl;
361 }
362 break;
363 case 's':
364 pstrcpy(s->title, sizeof(s->title), p);
365 break;
366 case 'i':
367 if (s->nb_streams == 0) {
368 pstrcpy(s->comment, sizeof(s->comment), p);
369 break;
370 }
371 break;
372 case 'm':
373 /* new stream */
374 get_word(st_type, sizeof(st_type), &p);
375 if (!strcmp(st_type, "audio")) {
376 codec_type = CODEC_TYPE_AUDIO;
377 } else if (!strcmp(st_type, "video")) {
378 codec_type = CODEC_TYPE_VIDEO;
379 } else {
380 return;
381 }
382 rtsp_st = av_mallocz(sizeof(RTSPStream));
383 if (!rtsp_st)
384 return;
385 rtsp_st->stream_index = -1;
386 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
387
388 rtsp_st->sdp_ip = s1->default_ip;
389 rtsp_st->sdp_ttl = s1->default_ttl;
390
391 get_word(buf1, sizeof(buf1), &p); /* port */
392 rtsp_st->sdp_port = atoi(buf1);
393
394 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
395
396 /* XXX: handle list of formats */
397 get_word(buf1, sizeof(buf1), &p); /* format list */
398 rtsp_st->sdp_payload_type = atoi(buf1);
399
400 if (!strcmp(AVRtpPayloadTypes[rtsp_st->sdp_payload_type].enc_name, "MP2T")) {
401 /* no corresponding stream */
402 } else {
403 st = av_new_stream(s, 0);
404 if (!st)
405 return;
406 st->priv_data = rtsp_st;
407 rtsp_st->stream_index = st->index;
408 st->codec->codec_type = codec_type;
409 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
410 /* if standard payload type, we can find the codec right now */
411 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
412 }
413 }
414 /* put a default control url */
415 pstrcpy(rtsp_st->control_url, sizeof(rtsp_st->control_url), s->filename);
416 break;
417 case 'a':
418 if (strstart(p, "control:", &p) && s->nb_streams > 0) {
419 char proto[32];
420 /* get the control url */
421 st = s->streams[s->nb_streams - 1];
422 rtsp_st = st->priv_data;
423
424 /* XXX: may need to add full url resolution */
425 url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
426 if (proto[0] == '\0') {
427 /* relative control URL */
428 pstrcat(rtsp_st->control_url, sizeof(rtsp_st->control_url), "/");
429 pstrcat(rtsp_st->control_url, sizeof(rtsp_st->control_url), p);
430 } else {
431 pstrcpy(rtsp_st->control_url, sizeof(rtsp_st->control_url), p);
432 }
433 } else if (strstart(p, "rtpmap:", &p)) {
434 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
435 get_word(buf1, sizeof(buf1), &p);
436 payload_type = atoi(buf1);
437 for(i = 0; i < s->nb_streams;i++) {
438 st = s->streams[i];
439 rtsp_st = st->priv_data;
440 if (rtsp_st->sdp_payload_type == payload_type) {
441 sdp_parse_rtpmap(st->codec, payload_type, p);
442 }
443 }
444 } else if (strstart(p, "fmtp:", &p)) {
445 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
446 get_word(buf1, sizeof(buf1), &p);
447 payload_type = atoi(buf1);
448 for(i = 0; i < s->nb_streams;i++) {
449 st = s->streams[i];
450 rtsp_st = st->priv_data;
451 if (rtsp_st->sdp_payload_type == payload_type) {
452 sdp_parse_fmtp(st, p);
453 }
454 }
455 }
456 break;
457 }
458}
459
460static int sdp_parse(AVFormatContext *s, const char *content)
461{
462 const char *p;
463 int letter;
464 char buf[1024], *q;
465 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
466
467 memset(s1, 0, sizeof(SDPParseState));
468 p = content;
469 for(;;) {
470 skip_spaces(&p);
471 letter = *p;
472 if (letter == '\0')
473 break;
474 p++;
475 if (*p != '=')
476 goto next_line;
477 p++;
478 /* get the content */
479 q = buf;
480 while (*p != '\n' && *p != '\r' && *p != '\0') {
481 if ((q - buf) < sizeof(buf) - 1)
482 *q++ = *p;
483 p++;
484 }
485 *q = '\0';
486 sdp_parse_line(s, s1, letter, buf);
487 next_line:
488 while (*p != '\n' && *p != '\0')
489 p++;
490 if (*p == '\n')
491 p++;
492 }
493 return 0;
494}
495
496static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
497{
498 const char *p;
499 int v;
500
501 p = *pp;
502 skip_spaces(&p);
503 v = strtol(p, (char **)&p, 10);
504 if (*p == '-') {
505 p++;
506 *min_ptr = v;
507 v = strtol(p, (char **)&p, 10);
508 *max_ptr = v;
509 } else {
510 *min_ptr = v;
511 *max_ptr = v;
512 }
513 *pp = p;
514}
515
516/* XXX: only one transport specification is parsed */
517static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
518{
519 char transport_protocol[16];
520 char profile[16];
521 char lower_transport[16];
522 char parameter[16];
523 RTSPTransportField *th;
524 char buf[256];
525
526 reply->nb_transports = 0;
527
528 for(;;) {
529 skip_spaces(&p);
530 if (*p == '\0')
531 break;
532
533 th = &reply->transports[reply->nb_transports];
534
535 get_word_sep(transport_protocol, sizeof(transport_protocol),
536 "/", &p);
537 if (*p == '/')
538 p++;
539 get_word_sep(profile, sizeof(profile), "/;,", &p);
540 lower_transport[0] = '\0';
541 if (*p == '/') {
542 p++;
543 get_word_sep(lower_transport, sizeof(lower_transport),
544 ";,", &p);
545 }
546 if (!strcasecmp(lower_transport, "TCP"))
547 th->protocol = RTSP_PROTOCOL_RTP_TCP;
548 else
549 th->protocol = RTSP_PROTOCOL_RTP_UDP;
550
551 if (*p == ';')
552 p++;
553 /* get each parameter */
554 while (*p != '\0' && *p != ',') {
555 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
556 if (!strcmp(parameter, "port")) {
557 if (*p == '=') {
558 p++;
559 rtsp_parse_range(&th->port_min, &th->port_max, &p);
560 }
561 } else if (!strcmp(parameter, "client_port")) {
562 if (*p == '=') {
563 p++;
564 rtsp_parse_range(&th->client_port_min,
565 &th->client_port_max, &p);
566 }
567 } else if (!strcmp(parameter, "server_port")) {
568 if (*p == '=') {
569 p++;
570 rtsp_parse_range(&th->server_port_min,
571 &th->server_port_max, &p);
572 }
573 } else if (!strcmp(parameter, "interleaved")) {
574 if (*p == '=') {
575 p++;
576 rtsp_parse_range(&th->interleaved_min,
577 &th->interleaved_max, &p);
578 }
579 } else if (!strcmp(parameter, "multicast")) {
580 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
581 th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
582 } else if (!strcmp(parameter, "ttl")) {
583 if (*p == '=') {
584 p++;
585 th->ttl = strtol(p, (char **)&p, 10);
586 }
587 } else if (!strcmp(parameter, "destination")) {
588 struct in_addr ipaddr;
589
590 if (*p == '=') {
591 p++;
592 get_word_sep(buf, sizeof(buf), ";,", &p);
593 if (inet_aton(buf, &ipaddr))
594 th->destination = ntohl(ipaddr.s_addr);
595 }
596 }
597 while (*p != ';' && *p != '\0' && *p != ',')
598 p++;
599 if (*p == ';')
600 p++;
601 }
602 if (*p == ',')
603 p++;
604
605 reply->nb_transports++;
606 }
607}
608
609static void rtsp_parse_range_npt(RTSPHeader *reply, const char *p)
610{
611 char buf[256];
612
613 skip_spaces(&p);
614 if (!stristart(p, "npt=", &p))
615 return;
616
617 reply->range_start = AV_NOPTS_VALUE;
618 reply->range_end = AV_NOPTS_VALUE;
619
620 get_word_sep(buf, sizeof(buf), "-", &p);
621 reply->range_start = parse_date(buf, 1);
622 if (*p == '-') {
623 p++;
624 get_word_sep(buf, sizeof(buf), "-", &p);
625 reply->range_end = parse_date(buf, 1);
626 }
627}
628
629void rtsp_parse_line(RTSPHeader *reply, const char *buf)
630{
631 const char *p;
632
633 /* NOTE: we do case independent match for broken servers */
634 p = buf;
635 if (stristart(p, "Session:", &p)) {
636 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
637 } else if (stristart(p, "Content-Length:", &p)) {
638 reply->content_length = strtol(p, NULL, 10);
639 } else if (stristart(p, "Transport:", &p)) {
640 rtsp_parse_transport(reply, p);
641 } else if (stristart(p, "CSeq:", &p)) {
642 reply->seq = strtol(p, NULL, 10);
643 } else if (stristart(p, "Range:", &p)) {
644 rtsp_parse_range_npt(reply, p);
645 }
646}
647
648static int url_readbuf(URLContext *h, unsigned char *buf, int size)
649{
650 int ret, len;
651
652 len = 0;
653 while (len < size) {
654 ret = url_read(h, buf+len, size-len);
655 if (ret < 1)
656 return ret;
657 len += ret;
658 }
659 return len;
660}
661
662/* skip a RTP/TCP interleaved packet */
663static void rtsp_skip_packet(AVFormatContext *s)
664{
665 RTSPState *rt = s->priv_data;
666 int ret, len, len1;
667 uint8_t buf[1024];
668
669 ret = url_readbuf(rt->rtsp_hd, buf, 3);
670 if (ret != 3)
671 return;
672 len = (buf[1] << 8) | buf[2];
673#ifdef DEBUG
674 printf("skipping RTP packet len=%d\n", len);
675#endif
676 /* skip payload */
677 while (len > 0) {
678 len1 = len;
679 if (len1 > sizeof(buf))
680 len1 = sizeof(buf);
681 ret = url_readbuf(rt->rtsp_hd, buf, len1);
682 if (ret != len1)
683 return;
684 len -= len1;
685 }
686}
687
688static void rtsp_send_cmd(AVFormatContext *s,
689 const char *cmd, RTSPHeader *reply,
690 unsigned char **content_ptr)
691{
692 RTSPState *rt = s->priv_data;
693 char buf[4096], buf1[1024], *q;
694 unsigned char ch;
695 const char *p;
696 int content_length, line_count;
697 unsigned char *content = NULL;
698
699 memset(reply, 0, sizeof(RTSPHeader));
700
701 rt->seq++;
702 pstrcpy(buf, sizeof(buf), cmd);
703 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
704 pstrcat(buf, sizeof(buf), buf1);
705 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
706 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
707 pstrcat(buf, sizeof(buf), buf1);
708 }
709 pstrcat(buf, sizeof(buf), "\r\n");
710#ifdef DEBUG
711 printf("Sending:\n%s--\n", buf);
712#endif
713 url_write(rt->rtsp_hd, buf, strlen(buf));
714
715 /* parse reply (XXX: use buffers) */
716 line_count = 0;
717 rt->last_reply[0] = '\0';
718 for(;;) {
719 q = buf;
720 for(;;) {
721 if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
722 break;
723 if (ch == '\n')
724 break;
725 if (ch == '$') {
726 /* XXX: only parse it if first char on line ? */
727 rtsp_skip_packet(s);
728 } else if (ch != '\r') {
729 if ((q - buf) < sizeof(buf) - 1)
730 *q++ = ch;
731 }
732 }
733 *q = '\0';
734#ifdef DEBUG
735 printf("line='%s'\n", buf);
736#endif
737 /* test if last line */
738 if (buf[0] == '\0')
739 break;
740 p = buf;
741 if (line_count == 0) {
742 /* get reply code */
743 get_word(buf1, sizeof(buf1), &p);
744 get_word(buf1, sizeof(buf1), &p);
745 reply->status_code = atoi(buf1);
746 } else {
747 rtsp_parse_line(reply, p);
748 pstrcat(rt->last_reply, sizeof(rt->last_reply), p);
749 pstrcat(rt->last_reply, sizeof(rt->last_reply), "\n");
750 }
751 line_count++;
752 }
753
754 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
755 pstrcpy(rt->session_id, sizeof(rt->session_id), reply->session_id);
756
757 content_length = reply->content_length;
758 if (content_length > 0) {
759 /* leave some room for a trailing '\0' (useful for simple parsing) */
760 content = av_malloc(content_length + 1);
761 (void)url_readbuf(rt->rtsp_hd, content, content_length);
762 content[content_length] = '\0';
763 }
764 if (content_ptr)
765 *content_ptr = content;
766}
767
768/* useful for modules: set RTSP callback function */
769
770void rtsp_set_callback(FFRTSPCallback *rtsp_cb)
771{
772 ff_rtsp_callback = rtsp_cb;
773}
774
775
776/* close and free RTSP streams */
777static void rtsp_close_streams(RTSPState *rt)
778{
779 int i;
780 RTSPStream *rtsp_st;
781
782 for(i=0;i<rt->nb_rtsp_streams;i++) {
783 rtsp_st = rt->rtsp_streams[i];
784 if (rtsp_st) {
785 if (rtsp_st->rtp_ctx)
786 rtp_parse_close(rtsp_st->rtp_ctx);
787 if (rtsp_st->rtp_handle)
788 url_close(rtsp_st->rtp_handle);
789 }
790 av_free(rtsp_st);
791 }
792 av_free(rt->rtsp_streams);
793}
794
795static int rtsp_read_header(AVFormatContext *s,
796 AVFormatParameters *ap)
797{
798 RTSPState *rt = s->priv_data;
799 char host[1024], path[1024], tcpname[1024], cmd[2048];
800 URLContext *rtsp_hd;
801 int port, i, j, ret, err;
802 RTSPHeader reply1, *reply = &reply1;
803 unsigned char *content = NULL;
804 RTSPStream *rtsp_st;
805 int protocol_mask;
806 AVStream *st;
807
808 /* extract hostname and port */
809 url_split(NULL, 0, NULL, 0,
810 host, sizeof(host), &port, path, sizeof(path), s->filename);
811 if (port < 0)
812 port = RTSP_DEFAULT_PORT;
813
814 /* open the tcp connexion */
815 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
816 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
817 return AVERROR_IO;
818 rt->rtsp_hd = rtsp_hd;
819 rt->seq = 0;
820
821 /* describe the stream */
822 snprintf(cmd, sizeof(cmd),
823 "DESCRIBE %s RTSP/1.0\r\n"
824 "Accept: application/sdp\r\n",
825 s->filename);
826 rtsp_send_cmd(s, cmd, reply, &content);
827 if (!content) {
828 err = AVERROR_INVALIDDATA;
829 goto fail;
830 }
831 if (reply->status_code != RTSP_STATUS_OK) {
832 err = AVERROR_INVALIDDATA;
833 goto fail;
834 }
835
836 /* now we got the SDP description, we parse it */
837 ret = sdp_parse(s, (const char *)content);
838 av_freep(&content);
839 if (ret < 0) {
840 err = AVERROR_INVALIDDATA;
841 goto fail;
842 }
843
844 protocol_mask = rtsp_default_protocols;
845
846 /* for each stream, make the setup request */
847 /* XXX: we assume the same server is used for the control of each
848 RTSP stream */
849
850 for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
851 char transport[2048];
852
853 rtsp_st = rt->rtsp_streams[i];
854
855 /* compute available transports */
856 transport[0] = '\0';
857
858 /* RTP/UDP */
859 if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
860 char buf[256];
861
862 /* first try in specified port range */
863 if (RTSP_RTP_PORT_MIN != 0) {
864 while(j <= RTSP_RTP_PORT_MAX) {
865 snprintf(buf, sizeof(buf), "rtp://?localport=%d", j);
866 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDONLY) == 0) {
867 j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
868 goto rtp_opened;
869 }
870 }
871 }
872
873/* then try on any port
874** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
875** err = AVERROR_INVALIDDATA;
876** goto fail;
877** }
878*/
879
880 rtp_opened:
881 port = rtp_get_local_port(rtsp_st->rtp_handle);
882 if (transport[0] != '\0')
883 pstrcat(transport, sizeof(transport), ",");
884 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
885 "RTP/AVP/UDP;unicast;client_port=%d-%d",
886 port, port + 1);
887 }
888
889 /* RTP/TCP */
890 else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
891 if (transport[0] != '\0')
892 pstrcat(transport, sizeof(transport), ",");
893 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
894 "RTP/AVP/TCP");
895 }
896
897 else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
898 if (transport[0] != '\0')
899 pstrcat(transport, sizeof(transport), ",");
900 snprintf(transport + strlen(transport),
901 sizeof(transport) - strlen(transport) - 1,
902 "RTP/AVP/UDP;multicast");
903 }
904 snprintf(cmd, sizeof(cmd),
905 "SETUP %s RTSP/1.0\r\n"
906 "Transport: %s\r\n",
907 rtsp_st->control_url, transport);
908 rtsp_send_cmd(s, cmd, reply, NULL);
909 if (reply->status_code != RTSP_STATUS_OK ||
910 reply->nb_transports != 1) {
911 err = AVERROR_INVALIDDATA;
912 goto fail;
913 }
914
915 /* XXX: same protocol for all streams is required */
916 if (i > 0) {
917 if (reply->transports[0].protocol != rt->protocol) {
918 err = AVERROR_INVALIDDATA;
919 goto fail;
920 }
921 } else {
922 rt->protocol = reply->transports[0].protocol;
923 }
924
925 /* close RTP connection if not choosen */
926 if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
927 (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
928 url_close(rtsp_st->rtp_handle);
929 rtsp_st->rtp_handle = NULL;
930 }
931
932 switch(reply->transports[0].protocol) {
933 case RTSP_PROTOCOL_RTP_TCP:
934 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
935 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
936 break;
937
938 case RTSP_PROTOCOL_RTP_UDP:
939 {
940 char url[1024];
941
942 /* XXX: also use address if specified */
943 snprintf(url, sizeof(url), "rtp://%s:%d",
944 host, reply->transports[0].server_port_min);
945 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
946 err = AVERROR_INVALIDDATA;
947 goto fail;
948 }
949 }
950 break;
951 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
952 {
953 char url[1024];
954 int ttl;
955
956 ttl = reply->transports[0].ttl;
957 if (!ttl)
958 ttl = 16;
959 snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
960 host,
961 reply->transports[0].server_port_min,
962 ttl);
963 if (url_open(&rtsp_st->rtp_handle, url, URL_RDONLY) < 0) {
964 err = AVERROR_INVALIDDATA;
965 goto fail;
966 }
967 }
968 break;
969 }
970 /* open the RTP context */
971 st = NULL;
972 if (rtsp_st->stream_index >= 0)
973 st = s->streams[rtsp_st->stream_index];
974 if (!st)
975 s->ctx_flags |= AVFMTCTX_NOHEADER;
976 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
977
978 if (!rtsp_st->rtp_ctx) {
979 err = AVERROR_NOMEM;
980 goto fail;
981 }
982 }
983
984 /* use callback if available to extend setup */
985 if (ff_rtsp_callback) {
986 if (ff_rtsp_callback(RTSP_ACTION_CLIENT_SETUP, rt->session_id,
987 NULL, 0, rt->last_reply) < 0) {
988 err = AVERROR_INVALIDDATA;
989 goto fail;
990 }
991 }
992
993
994 rt->state = RTSP_STATE_IDLE;
995 rt->seek_timestamp = 0; /* default is to start stream at position
996 zero */
997 if (ap->initial_pause) {
998 /* do not start immediately */
999 } else {
1000 if (rtsp_read_play(s) < 0) {
1001 err = AVERROR_INVALIDDATA;
1002 goto fail;
1003 }
1004 }
1005 return 0;
1006 fail:
1007 rtsp_close_streams(rt);
1008 av_freep(&content);
1009 url_close(rt->rtsp_hd);
1010 return err;
1011}
1012
1013static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1014 uint8_t *buf, int buf_size)
1015{
1016 RTSPState *rt = s->priv_data;
1017 int id, len, i, ret;
1018 RTSPStream *rtsp_st;
1019
1020#ifdef DEBUG_RTP_TCP
1021 printf("tcp_read_packet:\n");
1022#endif
1023 redo:
1024 for(;;) {
1025 ret = url_readbuf(rt->rtsp_hd, buf, 1);
1026#ifdef DEBUG_RTP_TCP
1027 printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1028#endif
1029 if (ret != 1)
1030 return -1;
1031 if (buf[0] == '$')
1032 break;
1033 }
1034 ret = url_readbuf(rt->rtsp_hd, buf, 3);
1035 if (ret != 3)
1036 return -1;
1037 id = buf[0];
1038 len = (buf[1] << 8) | buf[2];
1039#ifdef DEBUG_RTP_TCP
1040 printf("id=%d len=%d\n", id, len);
1041#endif
1042 if (len > buf_size || len < 12)
1043 goto redo;
1044 /* get the data */
1045 ret = url_readbuf(rt->rtsp_hd, buf, len);
1046 if (ret != len)
1047 return -1;
1048
1049 /* find the matching stream */
1050 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1051 rtsp_st = rt->rtsp_streams[i];
1052 if (id >= rtsp_st->interleaved_min &&
1053 id <= rtsp_st->interleaved_max)
1054 goto found;
1055 }
1056 goto redo;
1057 found:
1058 *prtsp_st = rtsp_st;
1059 return len;
1060}
1061
1062static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1063 uint8_t *buf, int buf_size)
1064{
1065 RTSPState *rt = s->priv_data;
1066 RTSPStream *rtsp_st;
1067 fd_set rfds;
1068 int fd1, fd2, fd_max, n, i, ret;
1069 struct timeval tv;
1070
1071 for(;;) {
1072 if (url_interrupt_cb())
1073 return -1;
1074 FD_ZERO(&rfds);
1075 fd_max = -1;
1076 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1077 rtsp_st = rt->rtsp_streams[i];
1078 /* currently, we cannot probe RTCP handle because of blocking restrictions */
1079 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1080 if (fd1 > fd_max)
1081 fd_max = fd1;
1082 FD_SET(fd1, &rfds);
1083 }
1084 tv.tv_sec = 0;
1085 tv.tv_usec = 100 * 1000;
1086 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1087 if (n > 0) {
1088 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1089 rtsp_st = rt->rtsp_streams[i];
1090 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1091 if (FD_ISSET(fd1, &rfds)) {
1092 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1093 if (ret > 0) {
1094 *prtsp_st = rtsp_st;
1095 return ret;
1096 }
1097 }
1098 }
1099 }
1100 }
1101}
1102
1103static int rtsp_read_packet(AVFormatContext *s,
1104 AVPacket *pkt)
1105{
1106 RTSPState *rt = s->priv_data;
1107 RTSPStream *rtsp_st;
1108 int ret, len;
1109 uint8_t buf[RTP_MAX_PACKET_LENGTH];
1110
1111 /* get next frames from the same RTP packet */
1112 if (rt->cur_rtp) {
1113 ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1114 if (ret == 0) {
1115 rt->cur_rtp = NULL;
1116 return 0;
1117 } else if (ret == 1) {
1118 return 0;
1119 } else {
1120 rt->cur_rtp = NULL;
1121 }
1122 }
1123
1124 /* read next RTP packet */
1125 redo:
1126 switch(rt->protocol) {
1127 default:
1128 case RTSP_PROTOCOL_RTP_TCP:
1129 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1130 break;
1131 case RTSP_PROTOCOL_RTP_UDP:
1132 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1133 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1134 break;
1135 }
1136 if (len < 0)
1137 return AVERROR_IO;
1138 ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1139 if (ret < 0)
1140 goto redo;
1141 if (ret == 1) {
1142 /* more packets may follow, so we save the RTP context */
1143 rt->cur_rtp = rtsp_st->rtp_ctx;
1144 }
1145 return 0;
1146}
1147
1148static int rtsp_read_play(AVFormatContext *s)
1149{
1150 RTSPState *rt = s->priv_data;
1151 RTSPHeader reply1, *reply = &reply1;
1152 char cmd[1024];
1153
1154 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1155
1156 if (rt->state == RTSP_STATE_PAUSED) {
1157 snprintf(cmd, sizeof(cmd),
1158 "PLAY %s RTSP/1.0\r\n",
1159 s->filename);
1160 } else {
1161 snprintf(cmd, sizeof(cmd),
1162 "PLAY %s RTSP/1.0\r\n"
1163 "Range: npt=%0.3f-\r\n",
1164 s->filename,
1165 (double)rt->seek_timestamp / AV_TIME_BASE);
1166 }
1167 rtsp_send_cmd(s, cmd, reply, NULL);
1168 if (reply->status_code != RTSP_STATUS_OK) {
1169 return -1;
1170 } else {
1171 rt->state = RTSP_STATE_PLAYING;
1172 return 0;
1173 }
1174}
1175
1176/* pause the stream */
1177static int rtsp_read_pause(AVFormatContext *s)
1178{
1179 RTSPState *rt = s->priv_data;
1180 RTSPHeader reply1, *reply = &reply1;
1181 char cmd[1024];
1182
1183 rt = s->priv_data;
1184
1185 if (rt->state != RTSP_STATE_PLAYING)
1186 return 0;
1187
1188 snprintf(cmd, sizeof(cmd),
1189 "PAUSE %s RTSP/1.0\r\n",
1190 s->filename);
1191 rtsp_send_cmd(s, cmd, reply, NULL);
1192 if (reply->status_code != RTSP_STATUS_OK) {
1193 return -1;
1194 } else {
1195 rt->state = RTSP_STATE_PAUSED;
1196 return 0;
1197 }
1198}
1199
1200static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1201 int64_t timestamp, int flags)
1202{
1203 RTSPState *rt = s->priv_data;
1204
1205 rt->seek_timestamp = timestamp;
1206 switch(rt->state) {
1207 default:
1208 case RTSP_STATE_IDLE:
1209 break;
1210 case RTSP_STATE_PLAYING:
1211 if (rtsp_read_play(s) != 0)
1212 return -1;
1213 break;
1214 case RTSP_STATE_PAUSED:
1215 rt->state = RTSP_STATE_IDLE;
1216 break;
1217 }
1218 return 0;
1219}
1220
1221static int rtsp_read_close(AVFormatContext *s)
1222{
1223 RTSPState *rt = s->priv_data;
1224 RTSPHeader reply1, *reply = &reply1;
1225 char cmd[1024];
1226
1227#if 0
1228 /* NOTE: it is valid to flush the buffer here */
1229 if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1230 url_fclose(&rt->rtsp_gb);
1231 }
1232#endif
1233 snprintf(cmd, sizeof(cmd),
1234 "TEARDOWN %s RTSP/1.0\r\n",
1235 s->filename);
1236 rtsp_send_cmd(s, cmd, reply, NULL);
1237
1238 if (ff_rtsp_callback) {
1239 ff_rtsp_callback(RTSP_ACTION_CLIENT_TEARDOWN, rt->session_id,
1240 NULL, 0, NULL);
1241 }
1242
1243 rtsp_close_streams(rt);
1244 url_close(rt->rtsp_hd);
1245 return 0;
1246}
1247
1248AVInputFormat rtsp_demuxer = {
1249 "rtsp",
1250 "RTSP input format",
1251 sizeof(RTSPState),
1252 rtsp_probe,
1253 rtsp_read_header,
1254 rtsp_read_packet,
1255 rtsp_read_close,
1256 rtsp_read_seek,
1257 .flags = AVFMT_NOFILE,
1258 .read_play = rtsp_read_play,
1259 .read_pause = rtsp_read_pause,
1260};
1261
1262static int sdp_probe(AVProbeData *p1)
1263{
1264 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1265
1266 /* we look for a line beginning "c=IN IP4" */
1267 while (p < p_end && *p != '\0') {
1268 if (p + sizeof("c=IN IP4") - 1 < p_end && strstart(p, "c=IN IP4", NULL))
1269 return AVPROBE_SCORE_MAX / 2;
1270
1271 while(p < p_end - 1 && *p != '\n') p++;
1272 if (++p >= p_end)
1273 break;
1274 if (*p == '\r')
1275 p++;
1276 }
1277 return 0;
1278}
1279
1280#define SDP_MAX_SIZE 8192
1281
1282static int sdp_read_header(AVFormatContext *s,
1283 AVFormatParameters *ap)
1284{
1285 RTSPState *rt = s->priv_data;
1286 RTSPStream *rtsp_st;
1287 int size, i, err;
1288 char *content;
1289 char url[1024];
1290 AVStream *st;
1291
1292 /* read the whole sdp file */
1293 /* XXX: better loading */
1294 content = av_malloc(SDP_MAX_SIZE);
1295 size = get_buffer(&s->pb, content, SDP_MAX_SIZE - 1);
1296 if (size <= 0) {
1297 av_free(content);
1298 return AVERROR_INVALIDDATA;
1299 }
1300 content[size] ='\0';
1301
1302 sdp_parse(s, content);
1303 av_free(content);
1304
1305 /* open each RTP stream */
1306 for(i=0;i<rt->nb_rtsp_streams;i++) {
1307 rtsp_st = rt->rtsp_streams[i];
1308
1309 snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1310 inet_ntoa(rtsp_st->sdp_ip),
1311 rtsp_st->sdp_port,
1312 rtsp_st->sdp_ttl);
1313 if (url_open(&rtsp_st->rtp_handle, url, URL_RDONLY) < 0) {
1314 err = AVERROR_INVALIDDATA;
1315 goto fail;
1316 }
1317 /* open the RTP context */
1318 st = NULL;
1319 if (rtsp_st->stream_index >= 0)
1320 st = s->streams[rtsp_st->stream_index];
1321 if (!st)
1322 s->ctx_flags |= AVFMTCTX_NOHEADER;
1323 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1324 if (!rtsp_st->rtp_ctx) {
1325 err = AVERROR_NOMEM;
1326 goto fail;
1327 }
1328 }
1329 return 0;
1330 fail:
1331 rtsp_close_streams(rt);
1332 return err;
1333}
1334
1335static int sdp_read_packet(AVFormatContext *s,
1336 AVPacket *pkt)
1337{
1338 return rtsp_read_packet(s, pkt);
1339}
1340
1341static int sdp_read_close(AVFormatContext *s)
1342{
1343 RTSPState *rt = s->priv_data;
1344 rtsp_close_streams(rt);
1345 return 0;
1346}
1347
1348
1349static AVInputFormat sdp_demuxer = {
1350 "sdp",
1351 "SDP",
1352 sizeof(RTSPState),
1353 sdp_probe,
1354 sdp_read_header,
1355 sdp_read_packet,
1356 sdp_read_close,
1357};
1358
1359
1360/* dummy redirector format (used directly in av_open_input_file now) */
1361static int redir_probe(AVProbeData *pd)
1362{
1363 const char *p;
1364 p = pd->buf;
1365 while (redir_isspace(*p))
1366 p++;
1367 if (strstart(p, "http://", NULL) ||
1368 strstart(p, "rtsp://", NULL))
1369 return AVPROBE_SCORE_MAX;
1370 return 0;
1371}
1372
1373/* called from utils.c */
1374int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f)
1375{
1376 char buf[4096], *q;
1377 int c;
1378 AVFormatContext *ic = NULL;
1379
1380 /* parse each URL and try to open it */
1381 c = url_fgetc(f);
1382 while (c != URL_EOF) {
1383 /* skip spaces */
1384 for(;;) {
1385 if (!redir_isspace(c))
1386 break;
1387 c = url_fgetc(f);
1388 }
1389 if (c == URL_EOF)
1390 break;
1391 /* record url */
1392 q = buf;
1393 for(;;) {
1394 if (c == URL_EOF || redir_isspace(c))
1395 break;
1396 if ((q - buf) < sizeof(buf) - 1)
1397 *q++ = c;
1398 c = url_fgetc(f);
1399 }
1400 *q = '\0';
1401 //printf("URL='%s'\n", buf);
1402 /* try to open the media file */
1403 if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1404 break;
1405 }
1406 *ic_ptr = ic;
1407 if (!ic)
1408 return AVERROR_IO;
1409 else
1410 return 0;
1411}
1412
1413AVInputFormat redir_demuxer = {
1414 "redir",
1415 "Redirector format",
1416 0,
1417 redir_probe,
1418 NULL,
1419 NULL,
1420 NULL,
1421};
1422
1423int rtsp_init(void)
1424{
1425 av_register_input_format(&rtsp_demuxer);
1426 av_register_input_format(&redir_demuxer);
1427 av_register_input_format(&sdp_demuxer);
1428 return 0;
1429}
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