rtsp multicast fix by Thijs Vermeir $1$2@gmail.com
[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
28 #include "rtp_internal.h"
29
30 //#define DEBUG
31 //#define DEBUG_RTP_TCP
32
33 enum RTSPClientState {
34 RTSP_STATE_IDLE,
35 RTSP_STATE_PLAYING,
36 RTSP_STATE_PAUSED,
37 };
38
39 typedef struct RTSPState {
40 URLContext *rtsp_hd; /* RTSP TCP connexion handle */
41 int nb_rtsp_streams;
42 struct RTSPStream **rtsp_streams;
43
44 enum RTSPClientState state;
45 int64_t seek_timestamp;
46
47 /* XXX: currently we use unbuffered input */
48 // ByteIOContext rtsp_gb;
49 int seq; /* RTSP command sequence number */
50 char session_id[512];
51 enum RTSPProtocol protocol;
52 char last_reply[2048]; /* XXX: allocate ? */
53 RTPDemuxContext *cur_rtp;
54 } RTSPState;
55
56 typedef struct RTSPStream {
57 URLContext *rtp_handle; /* RTP stream handle */
58 RTPDemuxContext *rtp_ctx; /* RTP parse context */
59
60 int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
61 int interleaved_min, interleaved_max; /* interleave ids, if TCP transport */
62 char control_url[1024]; /* url for this stream (from SDP) */
63
64 int sdp_port; /* port (from SDP content - not used in RTSP) */
65 struct in_addr sdp_ip; /* IP address (from SDP content - not used in RTSP) */
66 int sdp_ttl; /* IP TTL (from SDP content - not used in RTSP) */
67 int sdp_payload_type; /* payload type - only used in SDP */
68 rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
69
70 RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
71 void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
72 } RTSPStream;
73
74 static int rtsp_read_play(AVFormatContext *s);
75
76 /* XXX: currently, the only way to change the protocols consists in
77 changing this variable */
78
79 int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
80
81 static int rtsp_probe(AVProbeData *p)
82 {
83 if (av_strstart(p->filename, "rtsp:", NULL))
84 return AVPROBE_SCORE_MAX;
85 return 0;
86 }
87
88 static int redir_isspace(int c)
89 {
90 return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
91 }
92
93 static void skip_spaces(const char **pp)
94 {
95 const char *p;
96 p = *pp;
97 while (redir_isspace(*p))
98 p++;
99 *pp = p;
100 }
101
102 static void get_word_sep(char *buf, int buf_size, const char *sep,
103 const char **pp)
104 {
105 const char *p;
106 char *q;
107
108 p = *pp;
109 if (*p == '/')
110 p++;
111 skip_spaces(&p);
112 q = buf;
113 while (!strchr(sep, *p) && *p != '\0') {
114 if ((q - buf) < buf_size - 1)
115 *q++ = *p;
116 p++;
117 }
118 if (buf_size > 0)
119 *q = '\0';
120 *pp = p;
121 }
122
123 static void get_word(char *buf, int buf_size, const char **pp)
124 {
125 const char *p;
126 char *q;
127
128 p = *pp;
129 skip_spaces(&p);
130 q = buf;
131 while (!redir_isspace(*p) && *p != '\0') {
132 if ((q - buf) < buf_size - 1)
133 *q++ = *p;
134 p++;
135 }
136 if (buf_size > 0)
137 *q = '\0';
138 *pp = p;
139 }
140
141 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
142 params>] */
143 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
144 {
145 char buf[256];
146 int i;
147 AVCodec *c;
148 const char *c_name;
149
150 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
151 see if we can handle this kind of payload */
152 get_word_sep(buf, sizeof(buf), "/", &p);
153 if (payload_type >= RTP_PT_PRIVATE) {
154 RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
155 while(handler) {
156 if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
157 codec->codec_id = handler->codec_id;
158 rtsp_st->dynamic_handler= handler;
159 if(handler->open) {
160 rtsp_st->dynamic_protocol_context= handler->open();
161 }
162 break;
163 }
164 handler= handler->next;
165 }
166 } else {
167 /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
168 /* search into AVRtpPayloadTypes[] */
169 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
170 if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec->codec_type == AVRtpPayloadTypes[i].codec_type)){
171 codec->codec_id = AVRtpPayloadTypes[i].codec_id;
172 break;
173 }
174 }
175
176 c = avcodec_find_decoder(codec->codec_id);
177 if (c && c->name)
178 c_name = c->name;
179 else
180 c_name = (char *)NULL;
181
182 if (c_name) {
183 get_word_sep(buf, sizeof(buf), "/", &p);
184 i = atoi(buf);
185 switch (codec->codec_type) {
186 case CODEC_TYPE_AUDIO:
187 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
188 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
189 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
190 if (i > 0) {
191 codec->sample_rate = i;
192 get_word_sep(buf, sizeof(buf), "/", &p);
193 i = atoi(buf);
194 if (i > 0)
195 codec->channels = i;
196 // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
197 // frequency. No problem, but the sample rate is being set here by the sdp line. Upcoming patch forthcoming. (rdm)
198 }
199 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
200 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
201 break;
202 case CODEC_TYPE_VIDEO:
203 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
204 break;
205 default:
206 break;
207 }
208 return 0;
209 }
210
211 return -1;
212 }
213
214 /* return the length and optionnaly the data */
215 static int hex_to_data(uint8_t *data, const char *p)
216 {
217 int c, len, v;
218
219 len = 0;
220 v = 1;
221 for(;;) {
222 skip_spaces(&p);
223 if (p == '\0')
224 break;
225 c = toupper((unsigned char)*p++);
226 if (c >= '0' && c <= '9')
227 c = c - '0';
228 else if (c >= 'A' && c <= 'F')
229 c = c - 'A' + 10;
230 else
231 break;
232 v = (v << 4) | c;
233 if (v & 0x100) {
234 if (data)
235 data[len] = v;
236 len++;
237 v = 1;
238 }
239 }
240 return len;
241 }
242
243 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
244 {
245 switch (codec->codec_id) {
246 case CODEC_ID_MPEG4:
247 case CODEC_ID_AAC:
248 if (!strcmp(attr, "config")) {
249 /* decode the hexa encoded parameter */
250 int len = hex_to_data(NULL, value);
251 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
252 if (!codec->extradata)
253 return;
254 codec->extradata_size = len;
255 hex_to_data(codec->extradata, value);
256 }
257 break;
258 default:
259 break;
260 }
261 return;
262 }
263
264 typedef struct attrname_map
265 {
266 const char *str;
267 uint16_t type;
268 uint32_t offset;
269 } attrname_map_t;
270
271 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
272 #define ATTR_NAME_TYPE_INT 0
273 #define ATTR_NAME_TYPE_STR 1
274 static attrname_map_t attr_names[]=
275 {
276 {"SizeLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
277 {"IndexLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
278 {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
279 {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
280 {"StreamType", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
281 {"mode", ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
282 {NULL, -1, -1},
283 };
284
285 /** parse the attribute line from the fmtp a line of an sdp resonse. This is broken out as a function
286 * because it is used in rtp_h264.c, which is forthcoming.
287 */
288 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
289 {
290 skip_spaces(p);
291 if(**p)
292 {
293 get_word_sep(attr, attr_size, "=", p);
294 if (**p == '=')
295 (*p)++;
296 get_word_sep(value, value_size, ";", p);
297 if (**p == ';')
298 (*p)++;
299 return 1;
300 }
301 return 0;
302 }
303
304 /* parse a SDP line and save stream attributes */
305 static void sdp_parse_fmtp(AVStream *st, const char *p)
306 {
307 char attr[256];
308 char value[4096];
309 int i;
310
311 RTSPStream *rtsp_st = st->priv_data;
312 AVCodecContext *codec = st->codec;
313 rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
314
315 /* loop on each attribute */
316 while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
317 {
318 /* grab the codec extra_data from the config parameter of the fmtp line */
319 sdp_parse_fmtp_config(codec, attr, value);
320 /* Looking for a known attribute */
321 for (i = 0; attr_names[i].str; ++i) {
322 if (!strcasecmp(attr, attr_names[i].str)) {
323 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
324 *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
325 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
326 *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
327 }
328 }
329 }
330 }
331
332 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
333 * and end time.
334 * Used for seeking in the rtp stream.
335 */
336 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
337 {
338 char buf[256];
339
340 skip_spaces(&p);
341 if (!av_stristart(p, "npt=", &p))
342 return;
343
344 *start = AV_NOPTS_VALUE;
345 *end = AV_NOPTS_VALUE;
346
347 get_word_sep(buf, sizeof(buf), "-", &p);
348 *start = parse_date(buf, 1);
349 if (*p == '-') {
350 p++;
351 get_word_sep(buf, sizeof(buf), "-", &p);
352 *end = parse_date(buf, 1);
353 }
354 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
355 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
356 }
357
358 typedef struct SDPParseState {
359 /* SDP only */
360 struct in_addr default_ip;
361 int default_ttl;
362 } SDPParseState;
363
364 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
365 int letter, const char *buf)
366 {
367 RTSPState *rt = s->priv_data;
368 char buf1[64], st_type[64];
369 const char *p;
370 int codec_type, payload_type, i;
371 AVStream *st;
372 RTSPStream *rtsp_st;
373 struct in_addr sdp_ip;
374 int ttl;
375
376 #ifdef DEBUG
377 printf("sdp: %c='%s'\n", letter, buf);
378 #endif
379
380 p = buf;
381 switch(letter) {
382 case 'c':
383 get_word(buf1, sizeof(buf1), &p);
384 if (strcmp(buf1, "IN") != 0)
385 return;
386 get_word(buf1, sizeof(buf1), &p);
387 if (strcmp(buf1, "IP4") != 0)
388 return;
389 get_word_sep(buf1, sizeof(buf1), "/", &p);
390 if (inet_aton(buf1, &sdp_ip) == 0)
391 return;
392 ttl = 16;
393 if (*p == '/') {
394 p++;
395 get_word_sep(buf1, sizeof(buf1), "/", &p);
396 ttl = atoi(buf1);
397 }
398 if (s->nb_streams == 0) {
399 s1->default_ip = sdp_ip;
400 s1->default_ttl = ttl;
401 } else {
402 st = s->streams[s->nb_streams - 1];
403 rtsp_st = st->priv_data;
404 rtsp_st->sdp_ip = sdp_ip;
405 rtsp_st->sdp_ttl = ttl;
406 }
407 break;
408 case 's':
409 av_strlcpy(s->title, p, sizeof(s->title));
410 break;
411 case 'i':
412 if (s->nb_streams == 0) {
413 av_strlcpy(s->comment, p, sizeof(s->comment));
414 break;
415 }
416 break;
417 case 'm':
418 /* new stream */
419 get_word(st_type, sizeof(st_type), &p);
420 if (!strcmp(st_type, "audio")) {
421 codec_type = CODEC_TYPE_AUDIO;
422 } else if (!strcmp(st_type, "video")) {
423 codec_type = CODEC_TYPE_VIDEO;
424 } else {
425 return;
426 }
427 rtsp_st = av_mallocz(sizeof(RTSPStream));
428 if (!rtsp_st)
429 return;
430 rtsp_st->stream_index = -1;
431 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
432
433 rtsp_st->sdp_ip = s1->default_ip;
434 rtsp_st->sdp_ttl = s1->default_ttl;
435
436 get_word(buf1, sizeof(buf1), &p); /* port */
437 rtsp_st->sdp_port = atoi(buf1);
438
439 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
440
441 /* XXX: handle list of formats */
442 get_word(buf1, sizeof(buf1), &p); /* format list */
443 rtsp_st->sdp_payload_type = atoi(buf1);
444
445 if (!strcmp(AVRtpPayloadTypes[rtsp_st->sdp_payload_type].enc_name, "MP2T")) {
446 /* no corresponding stream */
447 } else {
448 st = av_new_stream(s, 0);
449 if (!st)
450 return;
451 st->priv_data = rtsp_st;
452 rtsp_st->stream_index = st->index;
453 st->codec->codec_type = codec_type;
454 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
455 /* if standard payload type, we can find the codec right now */
456 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
457 }
458 }
459 /* put a default control url */
460 av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
461 break;
462 case 'a':
463 if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
464 char proto[32];
465 /* get the control url */
466 st = s->streams[s->nb_streams - 1];
467 rtsp_st = st->priv_data;
468
469 /* XXX: may need to add full url resolution */
470 url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
471 if (proto[0] == '\0') {
472 /* relative control URL */
473 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
474 av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
475 } else {
476 av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
477 }
478 } else if (av_strstart(p, "rtpmap:", &p)) {
479 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
480 get_word(buf1, sizeof(buf1), &p);
481 payload_type = atoi(buf1);
482 for(i = 0; i < s->nb_streams;i++) {
483 st = s->streams[i];
484 rtsp_st = st->priv_data;
485 if (rtsp_st->sdp_payload_type == payload_type) {
486 sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
487 }
488 }
489 } else if (av_strstart(p, "fmtp:", &p)) {
490 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
491 get_word(buf1, sizeof(buf1), &p);
492 payload_type = atoi(buf1);
493 for(i = 0; i < s->nb_streams;i++) {
494 st = s->streams[i];
495 rtsp_st = st->priv_data;
496 if (rtsp_st->sdp_payload_type == payload_type) {
497 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
498 if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
499 sdp_parse_fmtp(st, p);
500 }
501 } else {
502 sdp_parse_fmtp(st, p);
503 }
504 }
505 }
506 } else if(av_strstart(p, "framesize:", &p)) {
507 // let dynamic protocol handlers have a stab at the line.
508 get_word(buf1, sizeof(buf1), &p);
509 payload_type = atoi(buf1);
510 for(i = 0; i < s->nb_streams;i++) {
511 st = s->streams[i];
512 rtsp_st = st->priv_data;
513 if (rtsp_st->sdp_payload_type == payload_type) {
514 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
515 rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
516 }
517 }
518 }
519 } else if(av_strstart(p, "range:", &p)) {
520 int64_t start, end;
521
522 // this is so that seeking on a streamed file can work.
523 rtsp_parse_range_npt(p, &start, &end);
524 s->start_time= start;
525 s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
526 }
527 break;
528 }
529 }
530
531 static int sdp_parse(AVFormatContext *s, const char *content)
532 {
533 const char *p;
534 int letter;
535 char buf[1024], *q;
536 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
537
538 memset(s1, 0, sizeof(SDPParseState));
539 p = content;
540 for(;;) {
541 skip_spaces(&p);
542 letter = *p;
543 if (letter == '\0')
544 break;
545 p++;
546 if (*p != '=')
547 goto next_line;
548 p++;
549 /* get the content */
550 q = buf;
551 while (*p != '\n' && *p != '\r' && *p != '\0') {
552 if ((q - buf) < sizeof(buf) - 1)
553 *q++ = *p;
554 p++;
555 }
556 *q = '\0';
557 sdp_parse_line(s, s1, letter, buf);
558 next_line:
559 while (*p != '\n' && *p != '\0')
560 p++;
561 if (*p == '\n')
562 p++;
563 }
564 return 0;
565 }
566
567 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
568 {
569 const char *p;
570 int v;
571
572 p = *pp;
573 skip_spaces(&p);
574 v = strtol(p, (char **)&p, 10);
575 if (*p == '-') {
576 p++;
577 *min_ptr = v;
578 v = strtol(p, (char **)&p, 10);
579 *max_ptr = v;
580 } else {
581 *min_ptr = v;
582 *max_ptr = v;
583 }
584 *pp = p;
585 }
586
587 /* XXX: only one transport specification is parsed */
588 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
589 {
590 char transport_protocol[16];
591 char profile[16];
592 char lower_transport[16];
593 char parameter[16];
594 RTSPTransportField *th;
595 char buf[256];
596
597 reply->nb_transports = 0;
598
599 for(;;) {
600 skip_spaces(&p);
601 if (*p == '\0')
602 break;
603
604 th = &reply->transports[reply->nb_transports];
605
606 get_word_sep(transport_protocol, sizeof(transport_protocol),
607 "/", &p);
608 if (*p == '/')
609 p++;
610 get_word_sep(profile, sizeof(profile), "/;,", &p);
611 lower_transport[0] = '\0';
612 if (*p == '/') {
613 p++;
614 get_word_sep(lower_transport, sizeof(lower_transport),
615 ";,", &p);
616 }
617 if (!strcasecmp(lower_transport, "TCP"))
618 th->protocol = RTSP_PROTOCOL_RTP_TCP;
619 else
620 th->protocol = RTSP_PROTOCOL_RTP_UDP;
621
622 if (*p == ';')
623 p++;
624 /* get each parameter */
625 while (*p != '\0' && *p != ',') {
626 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
627 if (!strcmp(parameter, "port")) {
628 if (*p == '=') {
629 p++;
630 rtsp_parse_range(&th->port_min, &th->port_max, &p);
631 }
632 } else if (!strcmp(parameter, "client_port")) {
633 if (*p == '=') {
634 p++;
635 rtsp_parse_range(&th->client_port_min,
636 &th->client_port_max, &p);
637 }
638 } else if (!strcmp(parameter, "server_port")) {
639 if (*p == '=') {
640 p++;
641 rtsp_parse_range(&th->server_port_min,
642 &th->server_port_max, &p);
643 }
644 } else if (!strcmp(parameter, "interleaved")) {
645 if (*p == '=') {
646 p++;
647 rtsp_parse_range(&th->interleaved_min,
648 &th->interleaved_max, &p);
649 }
650 } else if (!strcmp(parameter, "multicast")) {
651 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
652 th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
653 } else if (!strcmp(parameter, "ttl")) {
654 if (*p == '=') {
655 p++;
656 th->ttl = strtol(p, (char **)&p, 10);
657 }
658 } else if (!strcmp(parameter, "destination")) {
659 struct in_addr ipaddr;
660
661 if (*p == '=') {
662 p++;
663 get_word_sep(buf, sizeof(buf), ";,", &p);
664 if (inet_aton(buf, &ipaddr))
665 th->destination = ntohl(ipaddr.s_addr);
666 }
667 }
668 while (*p != ';' && *p != '\0' && *p != ',')
669 p++;
670 if (*p == ';')
671 p++;
672 }
673 if (*p == ',')
674 p++;
675
676 reply->nb_transports++;
677 }
678 }
679
680 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
681 {
682 const char *p;
683
684 /* NOTE: we do case independent match for broken servers */
685 p = buf;
686 if (av_stristart(p, "Session:", &p)) {
687 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
688 } else if (av_stristart(p, "Content-Length:", &p)) {
689 reply->content_length = strtol(p, NULL, 10);
690 } else if (av_stristart(p, "Transport:", &p)) {
691 rtsp_parse_transport(reply, p);
692 } else if (av_stristart(p, "CSeq:", &p)) {
693 reply->seq = strtol(p, NULL, 10);
694 } else if (av_stristart(p, "Range:", &p)) {
695 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
696 }
697 }
698
699 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
700 {
701 int ret, len;
702
703 len = 0;
704 while (len < size) {
705 ret = url_read(h, buf+len, size-len);
706 if (ret < 1)
707 return ret;
708 len += ret;
709 }
710 return len;
711 }
712
713 /* skip a RTP/TCP interleaved packet */
714 static void rtsp_skip_packet(AVFormatContext *s)
715 {
716 RTSPState *rt = s->priv_data;
717 int ret, len, len1;
718 uint8_t buf[1024];
719
720 ret = url_readbuf(rt->rtsp_hd, buf, 3);
721 if (ret != 3)
722 return;
723 len = AV_RB16(buf + 1);
724 #ifdef DEBUG
725 printf("skipping RTP packet len=%d\n", len);
726 #endif
727 /* skip payload */
728 while (len > 0) {
729 len1 = len;
730 if (len1 > sizeof(buf))
731 len1 = sizeof(buf);
732 ret = url_readbuf(rt->rtsp_hd, buf, len1);
733 if (ret != len1)
734 return;
735 len -= len1;
736 }
737 }
738
739 static void rtsp_send_cmd(AVFormatContext *s,
740 const char *cmd, RTSPHeader *reply,
741 unsigned char **content_ptr)
742 {
743 RTSPState *rt = s->priv_data;
744 char buf[4096], buf1[1024], *q;
745 unsigned char ch;
746 const char *p;
747 int content_length, line_count;
748 unsigned char *content = NULL;
749
750 memset(reply, 0, sizeof(RTSPHeader));
751
752 rt->seq++;
753 av_strlcpy(buf, cmd, sizeof(buf));
754 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
755 av_strlcat(buf, buf1, sizeof(buf));
756 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
757 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
758 av_strlcat(buf, buf1, sizeof(buf));
759 }
760 av_strlcat(buf, "\r\n", sizeof(buf));
761 #ifdef DEBUG
762 printf("Sending:\n%s--\n", buf);
763 #endif
764 url_write(rt->rtsp_hd, buf, strlen(buf));
765
766 /* parse reply (XXX: use buffers) */
767 line_count = 0;
768 rt->last_reply[0] = '\0';
769 for(;;) {
770 q = buf;
771 for(;;) {
772 if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
773 break;
774 if (ch == '\n')
775 break;
776 if (ch == '$') {
777 /* XXX: only parse it if first char on line ? */
778 rtsp_skip_packet(s);
779 } else if (ch != '\r') {
780 if ((q - buf) < sizeof(buf) - 1)
781 *q++ = ch;
782 }
783 }
784 *q = '\0';
785 #ifdef DEBUG
786 printf("line='%s'\n", buf);
787 #endif
788 /* test if last line */
789 if (buf[0] == '\0')
790 break;
791 p = buf;
792 if (line_count == 0) {
793 /* get reply code */
794 get_word(buf1, sizeof(buf1), &p);
795 get_word(buf1, sizeof(buf1), &p);
796 reply->status_code = atoi(buf1);
797 } else {
798 rtsp_parse_line(reply, p);
799 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
800 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
801 }
802 line_count++;
803 }
804
805 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
806 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
807
808 content_length = reply->content_length;
809 if (content_length > 0) {
810 /* leave some room for a trailing '\0' (useful for simple parsing) */
811 content = av_malloc(content_length + 1);
812 (void)url_readbuf(rt->rtsp_hd, content, content_length);
813 content[content_length] = '\0';
814 }
815 if (content_ptr)
816 *content_ptr = content;
817 }
818
819
820 /* close and free RTSP streams */
821 static void rtsp_close_streams(RTSPState *rt)
822 {
823 int i;
824 RTSPStream *rtsp_st;
825
826 for(i=0;i<rt->nb_rtsp_streams;i++) {
827 rtsp_st = rt->rtsp_streams[i];
828 if (rtsp_st) {
829 if (rtsp_st->rtp_ctx)
830 rtp_parse_close(rtsp_st->rtp_ctx);
831 if (rtsp_st->rtp_handle)
832 url_close(rtsp_st->rtp_handle);
833 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
834 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
835 }
836 av_free(rtsp_st);
837 }
838 av_free(rt->rtsp_streams);
839 }
840
841 static int rtsp_read_header(AVFormatContext *s,
842 AVFormatParameters *ap)
843 {
844 RTSPState *rt = s->priv_data;
845 char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
846 URLContext *rtsp_hd;
847 int port, i, j, ret, err;
848 RTSPHeader reply1, *reply = &reply1;
849 unsigned char *content = NULL;
850 RTSPStream *rtsp_st;
851 int protocol_mask = 0;
852 AVStream *st;
853
854 /* extract hostname and port */
855 url_split(NULL, 0, NULL, 0,
856 host, sizeof(host), &port, path, sizeof(path), s->filename);
857 if (port < 0)
858 port = RTSP_DEFAULT_PORT;
859
860 /* search for options */
861 option_list = strchr(path, '?');
862 if (option_list) {
863 /* remove the options from the path */
864 *option_list++ = 0;
865 while(option_list) {
866 /* move the option pointer */
867 option = option_list;
868 option_list = strchr(option_list, '&');
869 if (option_list)
870 *(option_list++) = 0;
871 /* handle the options */
872 if (strcmp(option, "udp") == 0)
873 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
874 else if (strcmp(option, "multicast") == 0)
875 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
876 else if (strcmp(option, "tcp") == 0)
877 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
878 }
879 }
880
881 if (!protocol_mask)
882 protocol_mask = rtsp_default_protocols;
883
884 /* open the tcp connexion */
885 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
886 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
887 return AVERROR_IO;
888 rt->rtsp_hd = rtsp_hd;
889 rt->seq = 0;
890
891 /* describe the stream */
892 snprintf(cmd, sizeof(cmd),
893 "DESCRIBE %s RTSP/1.0\r\n"
894 "Accept: application/sdp\r\n",
895 s->filename);
896 rtsp_send_cmd(s, cmd, reply, &content);
897 if (!content) {
898 err = AVERROR_INVALIDDATA;
899 goto fail;
900 }
901 if (reply->status_code != RTSP_STATUS_OK) {
902 err = AVERROR_INVALIDDATA;
903 goto fail;
904 }
905
906 /* now we got the SDP description, we parse it */
907 ret = sdp_parse(s, (const char *)content);
908 av_freep(&content);
909 if (ret < 0) {
910 err = AVERROR_INVALIDDATA;
911 goto fail;
912 }
913
914 /* for each stream, make the setup request */
915 /* XXX: we assume the same server is used for the control of each
916 RTSP stream */
917
918 for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
919 char transport[2048];
920
921 rtsp_st = rt->rtsp_streams[i];
922
923 /* compute available transports */
924 transport[0] = '\0';
925
926 /* RTP/UDP */
927 if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
928 char buf[256];
929
930 /* first try in specified port range */
931 if (RTSP_RTP_PORT_MIN != 0) {
932 while(j <= RTSP_RTP_PORT_MAX) {
933 snprintf(buf, sizeof(buf), "rtp://?localport=%d", j);
934 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
935 j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
936 goto rtp_opened;
937 }
938 }
939 }
940
941 /* then try on any port
942 ** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
943 ** err = AVERROR_INVALIDDATA;
944 ** goto fail;
945 ** }
946 */
947
948 rtp_opened:
949 port = rtp_get_local_port(rtsp_st->rtp_handle);
950 if (transport[0] != '\0')
951 av_strlcat(transport, ",", sizeof(transport));
952 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
953 "RTP/AVP/UDP;unicast;client_port=%d-%d",
954 port, port + 1);
955 }
956
957 /* RTP/TCP */
958 else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
959 if (transport[0] != '\0')
960 av_strlcat(transport, ",", sizeof(transport));
961 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
962 "RTP/AVP/TCP");
963 }
964
965 else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
966 if (transport[0] != '\0')
967 av_strlcat(transport, ",", sizeof(transport));
968 snprintf(transport + strlen(transport),
969 sizeof(transport) - strlen(transport) - 1,
970 "RTP/AVP/UDP;multicast");
971 }
972 snprintf(cmd, sizeof(cmd),
973 "SETUP %s RTSP/1.0\r\n"
974 "Transport: %s\r\n",
975 rtsp_st->control_url, transport);
976 rtsp_send_cmd(s, cmd, reply, NULL);
977 if (reply->status_code != RTSP_STATUS_OK ||
978 reply->nb_transports != 1) {
979 err = AVERROR_INVALIDDATA;
980 goto fail;
981 }
982
983 /* XXX: same protocol for all streams is required */
984 if (i > 0) {
985 if (reply->transports[0].protocol != rt->protocol) {
986 err = AVERROR_INVALIDDATA;
987 goto fail;
988 }
989 } else {
990 rt->protocol = reply->transports[0].protocol;
991 }
992
993 /* close RTP connection if not choosen */
994 if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
995 (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
996 url_close(rtsp_st->rtp_handle);
997 rtsp_st->rtp_handle = NULL;
998 }
999
1000 switch(reply->transports[0].protocol) {
1001 case RTSP_PROTOCOL_RTP_TCP:
1002 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1003 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1004 break;
1005
1006 case RTSP_PROTOCOL_RTP_UDP:
1007 {
1008 char url[1024];
1009
1010 /* XXX: also use address if specified */
1011 snprintf(url, sizeof(url), "rtp://%s:%d",
1012 host, reply->transports[0].server_port_min);
1013 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1014 err = AVERROR_INVALIDDATA;
1015 goto fail;
1016 }
1017 }
1018 break;
1019 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1020 {
1021 char url[1024];
1022 struct in_addr in;
1023
1024 in.s_addr = htonl(reply->transports[0].destination);
1025 snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1026 inet_ntoa(in),
1027 reply->transports[0].port_min,
1028 reply->transports[0].ttl);
1029 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1030 err = AVERROR_INVALIDDATA;
1031 goto fail;
1032 }
1033 }
1034 break;
1035 }
1036 /* open the RTP context */
1037 st = NULL;
1038 if (rtsp_st->stream_index >= 0)
1039 st = s->streams[rtsp_st->stream_index];
1040 if (!st)
1041 s->ctx_flags |= AVFMTCTX_NOHEADER;
1042 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1043
1044 if (!rtsp_st->rtp_ctx) {
1045 err = AVERROR_NOMEM;
1046 goto fail;
1047 } else {
1048 if(rtsp_st->dynamic_handler) {
1049 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1050 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1051 }
1052 }
1053 }
1054
1055 rt->state = RTSP_STATE_IDLE;
1056 rt->seek_timestamp = 0; /* default is to start stream at position
1057 zero */
1058 if (ap->initial_pause) {
1059 /* do not start immediately */
1060 } else {
1061 if (rtsp_read_play(s) < 0) {
1062 err = AVERROR_INVALIDDATA;
1063 goto fail;
1064 }
1065 }
1066 return 0;
1067 fail:
1068 rtsp_close_streams(rt);
1069 av_freep(&content);
1070 url_close(rt->rtsp_hd);
1071 return err;
1072 }
1073
1074 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1075 uint8_t *buf, int buf_size)
1076 {
1077 RTSPState *rt = s->priv_data;
1078 int id, len, i, ret;
1079 RTSPStream *rtsp_st;
1080
1081 #ifdef DEBUG_RTP_TCP
1082 printf("tcp_read_packet:\n");
1083 #endif
1084 redo:
1085 for(;;) {
1086 ret = url_readbuf(rt->rtsp_hd, buf, 1);
1087 #ifdef DEBUG_RTP_TCP
1088 printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1089 #endif
1090 if (ret != 1)
1091 return -1;
1092 if (buf[0] == '$')
1093 break;
1094 }
1095 ret = url_readbuf(rt->rtsp_hd, buf, 3);
1096 if (ret != 3)
1097 return -1;
1098 id = buf[0];
1099 len = AV_RB16(buf + 1);
1100 #ifdef DEBUG_RTP_TCP
1101 printf("id=%d len=%d\n", id, len);
1102 #endif
1103 if (len > buf_size || len < 12)
1104 goto redo;
1105 /* get the data */
1106 ret = url_readbuf(rt->rtsp_hd, buf, len);
1107 if (ret != len)
1108 return -1;
1109
1110 /* find the matching stream */
1111 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1112 rtsp_st = rt->rtsp_streams[i];
1113 if (id >= rtsp_st->interleaved_min &&
1114 id <= rtsp_st->interleaved_max)
1115 goto found;
1116 }
1117 goto redo;
1118 found:
1119 *prtsp_st = rtsp_st;
1120 return len;
1121 }
1122
1123 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1124 uint8_t *buf, int buf_size)
1125 {
1126 RTSPState *rt = s->priv_data;
1127 RTSPStream *rtsp_st;
1128 fd_set rfds;
1129 int fd1, fd2, fd_max, n, i, ret;
1130 struct timeval tv;
1131
1132 for(;;) {
1133 if (url_interrupt_cb())
1134 return -1;
1135 FD_ZERO(&rfds);
1136 fd_max = -1;
1137 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1138 rtsp_st = rt->rtsp_streams[i];
1139 /* currently, we cannot probe RTCP handle because of blocking restrictions */
1140 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1141 if (fd1 > fd_max)
1142 fd_max = fd1;
1143 FD_SET(fd1, &rfds);
1144 }
1145 tv.tv_sec = 0;
1146 tv.tv_usec = 100 * 1000;
1147 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1148 if (n > 0) {
1149 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1150 rtsp_st = rt->rtsp_streams[i];
1151 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1152 if (FD_ISSET(fd1, &rfds)) {
1153 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1154 if (ret > 0) {
1155 *prtsp_st = rtsp_st;
1156 return ret;
1157 }
1158 }
1159 }
1160 }
1161 }
1162 }
1163
1164 static int rtsp_read_packet(AVFormatContext *s,
1165 AVPacket *pkt)
1166 {
1167 RTSPState *rt = s->priv_data;
1168 RTSPStream *rtsp_st;
1169 int ret, len;
1170 uint8_t buf[RTP_MAX_PACKET_LENGTH];
1171
1172 /* get next frames from the same RTP packet */
1173 if (rt->cur_rtp) {
1174 ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1175 if (ret == 0) {
1176 rt->cur_rtp = NULL;
1177 return 0;
1178 } else if (ret == 1) {
1179 return 0;
1180 } else {
1181 rt->cur_rtp = NULL;
1182 }
1183 }
1184
1185 /* read next RTP packet */
1186 redo:
1187 switch(rt->protocol) {
1188 default:
1189 case RTSP_PROTOCOL_RTP_TCP:
1190 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1191 break;
1192 case RTSP_PROTOCOL_RTP_UDP:
1193 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1194 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1195 if (len >=0 && rtsp_st->rtp_ctx)
1196 rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1197 break;
1198 }
1199 if (len < 0)
1200 return AVERROR_IO;
1201 ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1202 if (ret < 0)
1203 goto redo;
1204 if (ret == 1) {
1205 /* more packets may follow, so we save the RTP context */
1206 rt->cur_rtp = rtsp_st->rtp_ctx;
1207 }
1208 return 0;
1209 }
1210
1211 static int rtsp_read_play(AVFormatContext *s)
1212 {
1213 RTSPState *rt = s->priv_data;
1214 RTSPHeader reply1, *reply = &reply1;
1215 char cmd[1024];
1216
1217 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1218
1219 if (rt->state == RTSP_STATE_PAUSED) {
1220 snprintf(cmd, sizeof(cmd),
1221 "PLAY %s RTSP/1.0\r\n",
1222 s->filename);
1223 } else {
1224 snprintf(cmd, sizeof(cmd),
1225 "PLAY %s RTSP/1.0\r\n"
1226 "Range: npt=%0.3f-\r\n",
1227 s->filename,
1228 (double)rt->seek_timestamp / AV_TIME_BASE);
1229 }
1230 rtsp_send_cmd(s, cmd, reply, NULL);
1231 if (reply->status_code != RTSP_STATUS_OK) {
1232 return -1;
1233 } else {
1234 rt->state = RTSP_STATE_PLAYING;
1235 return 0;
1236 }
1237 }
1238
1239 /* pause the stream */
1240 static int rtsp_read_pause(AVFormatContext *s)
1241 {
1242 RTSPState *rt = s->priv_data;
1243 RTSPHeader reply1, *reply = &reply1;
1244 char cmd[1024];
1245
1246 rt = s->priv_data;
1247
1248 if (rt->state != RTSP_STATE_PLAYING)
1249 return 0;
1250
1251 snprintf(cmd, sizeof(cmd),
1252 "PAUSE %s RTSP/1.0\r\n",
1253 s->filename);
1254 rtsp_send_cmd(s, cmd, reply, NULL);
1255 if (reply->status_code != RTSP_STATUS_OK) {
1256 return -1;
1257 } else {
1258 rt->state = RTSP_STATE_PAUSED;
1259 return 0;
1260 }
1261 }
1262
1263 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1264 int64_t timestamp, int flags)
1265 {
1266 RTSPState *rt = s->priv_data;
1267
1268 rt->seek_timestamp = timestamp;
1269 switch(rt->state) {
1270 default:
1271 case RTSP_STATE_IDLE:
1272 break;
1273 case RTSP_STATE_PLAYING:
1274 if (rtsp_read_play(s) != 0)
1275 return -1;
1276 break;
1277 case RTSP_STATE_PAUSED:
1278 rt->state = RTSP_STATE_IDLE;
1279 break;
1280 }
1281 return 0;
1282 }
1283
1284 static int rtsp_read_close(AVFormatContext *s)
1285 {
1286 RTSPState *rt = s->priv_data;
1287 RTSPHeader reply1, *reply = &reply1;
1288 char cmd[1024];
1289
1290 #if 0
1291 /* NOTE: it is valid to flush the buffer here */
1292 if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1293 url_fclose(&rt->rtsp_gb);
1294 }
1295 #endif
1296 snprintf(cmd, sizeof(cmd),
1297 "TEARDOWN %s RTSP/1.0\r\n",
1298 s->filename);
1299 rtsp_send_cmd(s, cmd, reply, NULL);
1300
1301 rtsp_close_streams(rt);
1302 url_close(rt->rtsp_hd);
1303 return 0;
1304 }
1305
1306 #ifdef CONFIG_RTSP_DEMUXER
1307 AVInputFormat rtsp_demuxer = {
1308 "rtsp",
1309 "RTSP input format",
1310 sizeof(RTSPState),
1311 rtsp_probe,
1312 rtsp_read_header,
1313 rtsp_read_packet,
1314 rtsp_read_close,
1315 rtsp_read_seek,
1316 .flags = AVFMT_NOFILE,
1317 .read_play = rtsp_read_play,
1318 .read_pause = rtsp_read_pause,
1319 };
1320 #endif
1321
1322 static int sdp_probe(AVProbeData *p1)
1323 {
1324 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1325
1326 /* we look for a line beginning "c=IN IP4" */
1327 while (p < p_end && *p != '\0') {
1328 if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1329 return AVPROBE_SCORE_MAX / 2;
1330
1331 while(p < p_end - 1 && *p != '\n') p++;
1332 if (++p >= p_end)
1333 break;
1334 if (*p == '\r')
1335 p++;
1336 }
1337 return 0;
1338 }
1339
1340 #define SDP_MAX_SIZE 8192
1341
1342 static int sdp_read_header(AVFormatContext *s,
1343 AVFormatParameters *ap)
1344 {
1345 RTSPState *rt = s->priv_data;
1346 RTSPStream *rtsp_st;
1347 int size, i, err;
1348 char *content;
1349 char url[1024];
1350 AVStream *st;
1351
1352 /* read the whole sdp file */
1353 /* XXX: better loading */
1354 content = av_malloc(SDP_MAX_SIZE);
1355 size = get_buffer(&s->pb, content, SDP_MAX_SIZE - 1);
1356 if (size <= 0) {
1357 av_free(content);
1358 return AVERROR_INVALIDDATA;
1359 }
1360 content[size] ='\0';
1361
1362 sdp_parse(s, content);
1363 av_free(content);
1364
1365 /* open each RTP stream */
1366 for(i=0;i<rt->nb_rtsp_streams;i++) {
1367 rtsp_st = rt->rtsp_streams[i];
1368
1369 snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1370 inet_ntoa(rtsp_st->sdp_ip),
1371 rtsp_st->sdp_port,
1372 rtsp_st->sdp_ttl);
1373 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1374 err = AVERROR_INVALIDDATA;
1375 goto fail;
1376 }
1377 /* open the RTP context */
1378 st = NULL;
1379 if (rtsp_st->stream_index >= 0)
1380 st = s->streams[rtsp_st->stream_index];
1381 if (!st)
1382 s->ctx_flags |= AVFMTCTX_NOHEADER;
1383 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1384 if (!rtsp_st->rtp_ctx) {
1385 err = AVERROR_NOMEM;
1386 goto fail;
1387 } else {
1388 if(rtsp_st->dynamic_handler) {
1389 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1390 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1391 }
1392 }
1393 }
1394 return 0;
1395 fail:
1396 rtsp_close_streams(rt);
1397 return err;
1398 }
1399
1400 static int sdp_read_packet(AVFormatContext *s,
1401 AVPacket *pkt)
1402 {
1403 return rtsp_read_packet(s, pkt);
1404 }
1405
1406 static int sdp_read_close(AVFormatContext *s)
1407 {
1408 RTSPState *rt = s->priv_data;
1409 rtsp_close_streams(rt);
1410 return 0;
1411 }
1412
1413 #ifdef CONFIG_SDP_DEMUXER
1414 AVInputFormat sdp_demuxer = {
1415 "sdp",
1416 "SDP",
1417 sizeof(RTSPState),
1418 sdp_probe,
1419 sdp_read_header,
1420 sdp_read_packet,
1421 sdp_read_close,
1422 };
1423 #endif
1424
1425 #ifdef CONFIG_REDIR_DEMUXER
1426 /* dummy redirector format (used directly in av_open_input_file now) */
1427 static int redir_probe(AVProbeData *pd)
1428 {
1429 const char *p;
1430 p = pd->buf;
1431 while (redir_isspace(*p))
1432 p++;
1433 if (av_strstart(p, "http://", NULL) ||
1434 av_strstart(p, "rtsp://", NULL))
1435 return AVPROBE_SCORE_MAX;
1436 return 0;
1437 }
1438
1439 /* called from utils.c */
1440 int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f)
1441 {
1442 char buf[4096], *q;
1443 int c;
1444 AVFormatContext *ic = NULL;
1445
1446 /* parse each URL and try to open it */
1447 c = url_fgetc(f);
1448 while (c != URL_EOF) {
1449 /* skip spaces */
1450 for(;;) {
1451 if (!redir_isspace(c))
1452 break;
1453 c = url_fgetc(f);
1454 }
1455 if (c == URL_EOF)
1456 break;
1457 /* record url */
1458 q = buf;
1459 for(;;) {
1460 if (c == URL_EOF || redir_isspace(c))
1461 break;
1462 if ((q - buf) < sizeof(buf) - 1)
1463 *q++ = c;
1464 c = url_fgetc(f);
1465 }
1466 *q = '\0';
1467 //printf("URL='%s'\n", buf);
1468 /* try to open the media file */
1469 if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1470 break;
1471 }
1472 *ic_ptr = ic;
1473 if (!ic)
1474 return AVERROR_IO;
1475 else
1476 return 0;
1477 }
1478
1479 AVInputFormat redir_demuxer = {
1480 "redir",
1481 "Redirector format",
1482 0,
1483 redir_probe,
1484 NULL,
1485 NULL,
1486 NULL,
1487 };
1488 #endif