ff66f4bb44a3c0c5afa7b44f5638dc16bc5e47cb
[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 int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
81
82 static int rtsp_probe(AVProbeData *p)
83 {
84 if (av_strstart(p->filename, "rtsp:", NULL))
85 return AVPROBE_SCORE_MAX;
86 return 0;
87 }
88
89 static int redir_isspace(int c)
90 {
91 return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
92 }
93
94 static void skip_spaces(const char **pp)
95 {
96 const char *p;
97 p = *pp;
98 while (redir_isspace(*p))
99 p++;
100 *pp = p;
101 }
102
103 static void get_word_sep(char *buf, int buf_size, const char *sep,
104 const char **pp)
105 {
106 const char *p;
107 char *q;
108
109 p = *pp;
110 if (*p == '/')
111 p++;
112 skip_spaces(&p);
113 q = buf;
114 while (!strchr(sep, *p) && *p != '\0') {
115 if ((q - buf) < buf_size - 1)
116 *q++ = *p;
117 p++;
118 }
119 if (buf_size > 0)
120 *q = '\0';
121 *pp = p;
122 }
123
124 static void get_word(char *buf, int buf_size, const char **pp)
125 {
126 const char *p;
127 char *q;
128
129 p = *pp;
130 skip_spaces(&p);
131 q = buf;
132 while (!redir_isspace(*p) && *p != '\0') {
133 if ((q - buf) < buf_size - 1)
134 *q++ = *p;
135 p++;
136 }
137 if (buf_size > 0)
138 *q = '\0';
139 *pp = p;
140 }
141
142 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
143 params>] */
144 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
145 {
146 char buf[256];
147 int i;
148 AVCodec *c;
149 const char *c_name;
150
151 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
152 see if we can handle this kind of payload */
153 get_word_sep(buf, sizeof(buf), "/", &p);
154 if (payload_type >= RTP_PT_PRIVATE) {
155 RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
156 while(handler) {
157 if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
158 codec->codec_id = handler->codec_id;
159 rtsp_st->dynamic_handler= handler;
160 if(handler->open) {
161 rtsp_st->dynamic_protocol_context= handler->open();
162 }
163 break;
164 }
165 handler= handler->next;
166 }
167 } else {
168 /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
169 /* search into AVRtpPayloadTypes[] */
170 codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
171 }
172
173 c = avcodec_find_decoder(codec->codec_id);
174 if (c && c->name)
175 c_name = c->name;
176 else
177 c_name = (char *)NULL;
178
179 if (c_name) {
180 get_word_sep(buf, sizeof(buf), "/", &p);
181 i = atoi(buf);
182 switch (codec->codec_type) {
183 case CODEC_TYPE_AUDIO:
184 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
185 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
186 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
187 if (i > 0) {
188 codec->sample_rate = i;
189 get_word_sep(buf, sizeof(buf), "/", &p);
190 i = atoi(buf);
191 if (i > 0)
192 codec->channels = i;
193 // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
194 // frequency. No problem, but the sample rate is being set here by the sdp line. Upcoming patch forthcoming. (rdm)
195 }
196 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
197 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
198 break;
199 case CODEC_TYPE_VIDEO:
200 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
201 break;
202 default:
203 break;
204 }
205 return 0;
206 }
207
208 return -1;
209 }
210
211 /* return the length and optionnaly the data */
212 static int hex_to_data(uint8_t *data, const char *p)
213 {
214 int c, len, v;
215
216 len = 0;
217 v = 1;
218 for(;;) {
219 skip_spaces(&p);
220 if (p == '\0')
221 break;
222 c = toupper((unsigned char)*p++);
223 if (c >= '0' && c <= '9')
224 c = c - '0';
225 else if (c >= 'A' && c <= 'F')
226 c = c - 'A' + 10;
227 else
228 break;
229 v = (v << 4) | c;
230 if (v & 0x100) {
231 if (data)
232 data[len] = v;
233 len++;
234 v = 1;
235 }
236 }
237 return len;
238 }
239
240 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
241 {
242 switch (codec->codec_id) {
243 case CODEC_ID_MPEG4:
244 case CODEC_ID_AAC:
245 if (!strcmp(attr, "config")) {
246 /* decode the hexa encoded parameter */
247 int len = hex_to_data(NULL, value);
248 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
249 if (!codec->extradata)
250 return;
251 codec->extradata_size = len;
252 hex_to_data(codec->extradata, value);
253 }
254 break;
255 default:
256 break;
257 }
258 return;
259 }
260
261 typedef struct attrname_map
262 {
263 const char *str;
264 uint16_t type;
265 uint32_t offset;
266 } attrname_map_t;
267
268 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
269 #define ATTR_NAME_TYPE_INT 0
270 #define ATTR_NAME_TYPE_STR 1
271 static attrname_map_t attr_names[]=
272 {
273 {"SizeLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
274 {"IndexLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
275 {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
276 {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
277 {"StreamType", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
278 {"mode", ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
279 {NULL, -1, -1},
280 };
281
282 /** parse the attribute line from the fmtp a line of an sdp resonse. This is broken out as a function
283 * because it is used in rtp_h264.c, which is forthcoming.
284 */
285 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
286 {
287 skip_spaces(p);
288 if(**p)
289 {
290 get_word_sep(attr, attr_size, "=", p);
291 if (**p == '=')
292 (*p)++;
293 get_word_sep(value, value_size, ";", p);
294 if (**p == ';')
295 (*p)++;
296 return 1;
297 }
298 return 0;
299 }
300
301 /* parse a SDP line and save stream attributes */
302 static void sdp_parse_fmtp(AVStream *st, const char *p)
303 {
304 char attr[256];
305 char value[4096];
306 int i;
307
308 RTSPStream *rtsp_st = st->priv_data;
309 AVCodecContext *codec = st->codec;
310 rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
311
312 /* loop on each attribute */
313 while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
314 {
315 /* grab the codec extra_data from the config parameter of the fmtp line */
316 sdp_parse_fmtp_config(codec, attr, value);
317 /* Looking for a known attribute */
318 for (i = 0; attr_names[i].str; ++i) {
319 if (!strcasecmp(attr, attr_names[i].str)) {
320 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
321 *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
322 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
323 *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
324 }
325 }
326 }
327 }
328
329 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
330 * and end time.
331 * Used for seeking in the rtp stream.
332 */
333 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
334 {
335 char buf[256];
336
337 skip_spaces(&p);
338 if (!av_stristart(p, "npt=", &p))
339 return;
340
341 *start = AV_NOPTS_VALUE;
342 *end = AV_NOPTS_VALUE;
343
344 get_word_sep(buf, sizeof(buf), "-", &p);
345 *start = parse_date(buf, 1);
346 if (*p == '-') {
347 p++;
348 get_word_sep(buf, sizeof(buf), "-", &p);
349 *end = parse_date(buf, 1);
350 }
351 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
352 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
353 }
354
355 typedef struct SDPParseState {
356 /* SDP only */
357 struct in_addr default_ip;
358 int default_ttl;
359 } SDPParseState;
360
361 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
362 int letter, const char *buf)
363 {
364 RTSPState *rt = s->priv_data;
365 char buf1[64], st_type[64];
366 const char *p;
367 int codec_type, payload_type, i;
368 AVStream *st;
369 RTSPStream *rtsp_st;
370 struct in_addr sdp_ip;
371 int ttl;
372
373 #ifdef DEBUG
374 printf("sdp: %c='%s'\n", letter, buf);
375 #endif
376
377 p = buf;
378 switch(letter) {
379 case 'c':
380 get_word(buf1, sizeof(buf1), &p);
381 if (strcmp(buf1, "IN") != 0)
382 return;
383 get_word(buf1, sizeof(buf1), &p);
384 if (strcmp(buf1, "IP4") != 0)
385 return;
386 get_word_sep(buf1, sizeof(buf1), "/", &p);
387 if (inet_aton(buf1, &sdp_ip) == 0)
388 return;
389 ttl = 16;
390 if (*p == '/') {
391 p++;
392 get_word_sep(buf1, sizeof(buf1), "/", &p);
393 ttl = atoi(buf1);
394 }
395 if (s->nb_streams == 0) {
396 s1->default_ip = sdp_ip;
397 s1->default_ttl = ttl;
398 } else {
399 st = s->streams[s->nb_streams - 1];
400 rtsp_st = st->priv_data;
401 rtsp_st->sdp_ip = sdp_ip;
402 rtsp_st->sdp_ttl = ttl;
403 }
404 break;
405 case 's':
406 av_strlcpy(s->title, p, sizeof(s->title));
407 break;
408 case 'i':
409 if (s->nb_streams == 0) {
410 av_strlcpy(s->comment, p, sizeof(s->comment));
411 break;
412 }
413 break;
414 case 'm':
415 /* new stream */
416 get_word(st_type, sizeof(st_type), &p);
417 if (!strcmp(st_type, "audio")) {
418 codec_type = CODEC_TYPE_AUDIO;
419 } else if (!strcmp(st_type, "video")) {
420 codec_type = CODEC_TYPE_VIDEO;
421 } else {
422 return;
423 }
424 rtsp_st = av_mallocz(sizeof(RTSPStream));
425 if (!rtsp_st)
426 return;
427 rtsp_st->stream_index = -1;
428 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
429
430 rtsp_st->sdp_ip = s1->default_ip;
431 rtsp_st->sdp_ttl = s1->default_ttl;
432
433 get_word(buf1, sizeof(buf1), &p); /* port */
434 rtsp_st->sdp_port = atoi(buf1);
435
436 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
437
438 /* XXX: handle list of formats */
439 get_word(buf1, sizeof(buf1), &p); /* format list */
440 rtsp_st->sdp_payload_type = atoi(buf1);
441
442 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
443 /* no corresponding stream */
444 } else {
445 st = av_new_stream(s, 0);
446 if (!st)
447 return;
448 st->priv_data = rtsp_st;
449 rtsp_st->stream_index = st->index;
450 st->codec->codec_type = codec_type;
451 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
452 /* if standard payload type, we can find the codec right now */
453 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
454 }
455 }
456 /* put a default control url */
457 av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
458 break;
459 case 'a':
460 if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
461 char proto[32];
462 /* get the control url */
463 st = s->streams[s->nb_streams - 1];
464 rtsp_st = st->priv_data;
465
466 /* XXX: may need to add full url resolution */
467 url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
468 if (proto[0] == '\0') {
469 /* relative control URL */
470 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
471 av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
472 } else {
473 av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
474 }
475 } else if (av_strstart(p, "rtpmap:", &p)) {
476 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
477 get_word(buf1, sizeof(buf1), &p);
478 payload_type = atoi(buf1);
479 for(i = 0; i < s->nb_streams;i++) {
480 st = s->streams[i];
481 rtsp_st = st->priv_data;
482 if (rtsp_st->sdp_payload_type == payload_type) {
483 sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
484 }
485 }
486 } else if (av_strstart(p, "fmtp:", &p)) {
487 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
488 get_word(buf1, sizeof(buf1), &p);
489 payload_type = atoi(buf1);
490 for(i = 0; i < s->nb_streams;i++) {
491 st = s->streams[i];
492 rtsp_st = st->priv_data;
493 if (rtsp_st->sdp_payload_type == payload_type) {
494 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
495 if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
496 sdp_parse_fmtp(st, p);
497 }
498 } else {
499 sdp_parse_fmtp(st, p);
500 }
501 }
502 }
503 } else if(av_strstart(p, "framesize:", &p)) {
504 // let dynamic protocol handlers have a stab at the line.
505 get_word(buf1, sizeof(buf1), &p);
506 payload_type = atoi(buf1);
507 for(i = 0; i < s->nb_streams;i++) {
508 st = s->streams[i];
509 rtsp_st = st->priv_data;
510 if (rtsp_st->sdp_payload_type == payload_type) {
511 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
512 rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
513 }
514 }
515 }
516 } else if(av_strstart(p, "range:", &p)) {
517 int64_t start, end;
518
519 // this is so that seeking on a streamed file can work.
520 rtsp_parse_range_npt(p, &start, &end);
521 s->start_time= start;
522 s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
523 }
524 break;
525 }
526 }
527
528 static int sdp_parse(AVFormatContext *s, const char *content)
529 {
530 const char *p;
531 int letter;
532 char buf[1024], *q;
533 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
534
535 memset(s1, 0, sizeof(SDPParseState));
536 p = content;
537 for(;;) {
538 skip_spaces(&p);
539 letter = *p;
540 if (letter == '\0')
541 break;
542 p++;
543 if (*p != '=')
544 goto next_line;
545 p++;
546 /* get the content */
547 q = buf;
548 while (*p != '\n' && *p != '\r' && *p != '\0') {
549 if ((q - buf) < sizeof(buf) - 1)
550 *q++ = *p;
551 p++;
552 }
553 *q = '\0';
554 sdp_parse_line(s, s1, letter, buf);
555 next_line:
556 while (*p != '\n' && *p != '\0')
557 p++;
558 if (*p == '\n')
559 p++;
560 }
561 return 0;
562 }
563
564 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
565 {
566 const char *p;
567 int v;
568
569 p = *pp;
570 skip_spaces(&p);
571 v = strtol(p, (char **)&p, 10);
572 if (*p == '-') {
573 p++;
574 *min_ptr = v;
575 v = strtol(p, (char **)&p, 10);
576 *max_ptr = v;
577 } else {
578 *min_ptr = v;
579 *max_ptr = v;
580 }
581 *pp = p;
582 }
583
584 /* XXX: only one transport specification is parsed */
585 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
586 {
587 char transport_protocol[16];
588 char profile[16];
589 char lower_transport[16];
590 char parameter[16];
591 RTSPTransportField *th;
592 char buf[256];
593
594 reply->nb_transports = 0;
595
596 for(;;) {
597 skip_spaces(&p);
598 if (*p == '\0')
599 break;
600
601 th = &reply->transports[reply->nb_transports];
602
603 get_word_sep(transport_protocol, sizeof(transport_protocol),
604 "/", &p);
605 if (*p == '/')
606 p++;
607 if (!strcasecmp (transport_protocol, "rtp")) {
608 get_word_sep(profile, sizeof(profile), "/;,", &p);
609 lower_transport[0] = '\0';
610 /* rtp/avp/<protocol> */
611 if (*p == '/') {
612 p++;
613 get_word_sep(lower_transport, sizeof(lower_transport),
614 ";,", &p);
615 }
616 } else if (!strcasecmp (transport_protocol, "x-pn-tng")) {
617 /* x-pn-tng/<protocol> */
618 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
619 profile[0] = '\0';
620 }
621 if (!strcasecmp(lower_transport, "TCP"))
622 th->protocol = RTSP_PROTOCOL_RTP_TCP;
623 else
624 th->protocol = RTSP_PROTOCOL_RTP_UDP;
625
626 if (*p == ';')
627 p++;
628 /* get each parameter */
629 while (*p != '\0' && *p != ',') {
630 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
631 if (!strcmp(parameter, "port")) {
632 if (*p == '=') {
633 p++;
634 rtsp_parse_range(&th->port_min, &th->port_max, &p);
635 }
636 } else if (!strcmp(parameter, "client_port")) {
637 if (*p == '=') {
638 p++;
639 rtsp_parse_range(&th->client_port_min,
640 &th->client_port_max, &p);
641 }
642 } else if (!strcmp(parameter, "server_port")) {
643 if (*p == '=') {
644 p++;
645 rtsp_parse_range(&th->server_port_min,
646 &th->server_port_max, &p);
647 }
648 } else if (!strcmp(parameter, "interleaved")) {
649 if (*p == '=') {
650 p++;
651 rtsp_parse_range(&th->interleaved_min,
652 &th->interleaved_max, &p);
653 }
654 } else if (!strcmp(parameter, "multicast")) {
655 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
656 th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
657 } else if (!strcmp(parameter, "ttl")) {
658 if (*p == '=') {
659 p++;
660 th->ttl = strtol(p, (char **)&p, 10);
661 }
662 } else if (!strcmp(parameter, "destination")) {
663 struct in_addr ipaddr;
664
665 if (*p == '=') {
666 p++;
667 get_word_sep(buf, sizeof(buf), ";,", &p);
668 if (inet_aton(buf, &ipaddr))
669 th->destination = ntohl(ipaddr.s_addr);
670 }
671 }
672 while (*p != ';' && *p != '\0' && *p != ',')
673 p++;
674 if (*p == ';')
675 p++;
676 }
677 if (*p == ',')
678 p++;
679
680 reply->nb_transports++;
681 }
682 }
683
684 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
685 {
686 const char *p;
687
688 /* NOTE: we do case independent match for broken servers */
689 p = buf;
690 if (av_stristart(p, "Session:", &p)) {
691 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
692 } else if (av_stristart(p, "Content-Length:", &p)) {
693 reply->content_length = strtol(p, NULL, 10);
694 } else if (av_stristart(p, "Transport:", &p)) {
695 rtsp_parse_transport(reply, p);
696 } else if (av_stristart(p, "CSeq:", &p)) {
697 reply->seq = strtol(p, NULL, 10);
698 } else if (av_stristart(p, "Range:", &p)) {
699 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
700 }
701 }
702
703 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
704 {
705 int ret, len;
706
707 len = 0;
708 while (len < size) {
709 ret = url_read(h, buf+len, size-len);
710 if (ret < 1)
711 return ret;
712 len += ret;
713 }
714 return len;
715 }
716
717 /* skip a RTP/TCP interleaved packet */
718 static void rtsp_skip_packet(AVFormatContext *s)
719 {
720 RTSPState *rt = s->priv_data;
721 int ret, len, len1;
722 uint8_t buf[1024];
723
724 ret = url_readbuf(rt->rtsp_hd, buf, 3);
725 if (ret != 3)
726 return;
727 len = AV_RB16(buf + 1);
728 #ifdef DEBUG
729 printf("skipping RTP packet len=%d\n", len);
730 #endif
731 /* skip payload */
732 while (len > 0) {
733 len1 = len;
734 if (len1 > sizeof(buf))
735 len1 = sizeof(buf);
736 ret = url_readbuf(rt->rtsp_hd, buf, len1);
737 if (ret != len1)
738 return;
739 len -= len1;
740 }
741 }
742
743 static void rtsp_send_cmd(AVFormatContext *s,
744 const char *cmd, RTSPHeader *reply,
745 unsigned char **content_ptr)
746 {
747 RTSPState *rt = s->priv_data;
748 char buf[4096], buf1[1024], *q;
749 unsigned char ch;
750 const char *p;
751 int content_length, line_count;
752 unsigned char *content = NULL;
753
754 memset(reply, 0, sizeof(RTSPHeader));
755
756 rt->seq++;
757 av_strlcpy(buf, cmd, sizeof(buf));
758 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
759 av_strlcat(buf, buf1, sizeof(buf));
760 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
761 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
762 av_strlcat(buf, buf1, sizeof(buf));
763 }
764 av_strlcat(buf, "\r\n", sizeof(buf));
765 #ifdef DEBUG
766 printf("Sending:\n%s--\n", buf);
767 #endif
768 url_write(rt->rtsp_hd, buf, strlen(buf));
769
770 /* parse reply (XXX: use buffers) */
771 line_count = 0;
772 rt->last_reply[0] = '\0';
773 for(;;) {
774 q = buf;
775 for(;;) {
776 if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
777 break;
778 if (ch == '\n')
779 break;
780 if (ch == '$') {
781 /* XXX: only parse it if first char on line ? */
782 rtsp_skip_packet(s);
783 } else if (ch != '\r') {
784 if ((q - buf) < sizeof(buf) - 1)
785 *q++ = ch;
786 }
787 }
788 *q = '\0';
789 #ifdef DEBUG
790 printf("line='%s'\n", buf);
791 #endif
792 /* test if last line */
793 if (buf[0] == '\0')
794 break;
795 p = buf;
796 if (line_count == 0) {
797 /* get reply code */
798 get_word(buf1, sizeof(buf1), &p);
799 get_word(buf1, sizeof(buf1), &p);
800 reply->status_code = atoi(buf1);
801 } else {
802 rtsp_parse_line(reply, p);
803 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
804 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
805 }
806 line_count++;
807 }
808
809 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
810 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
811
812 content_length = reply->content_length;
813 if (content_length > 0) {
814 /* leave some room for a trailing '\0' (useful for simple parsing) */
815 content = av_malloc(content_length + 1);
816 (void)url_readbuf(rt->rtsp_hd, content, content_length);
817 content[content_length] = '\0';
818 }
819 if (content_ptr)
820 *content_ptr = content;
821 else
822 av_free(content);
823 }
824
825
826 /* close and free RTSP streams */
827 static void rtsp_close_streams(RTSPState *rt)
828 {
829 int i;
830 RTSPStream *rtsp_st;
831
832 for(i=0;i<rt->nb_rtsp_streams;i++) {
833 rtsp_st = rt->rtsp_streams[i];
834 if (rtsp_st) {
835 if (rtsp_st->rtp_ctx)
836 rtp_parse_close(rtsp_st->rtp_ctx);
837 if (rtsp_st->rtp_handle)
838 url_close(rtsp_st->rtp_handle);
839 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
840 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
841 }
842 av_free(rtsp_st);
843 }
844 av_free(rt->rtsp_streams);
845 }
846
847 static int rtsp_read_header(AVFormatContext *s,
848 AVFormatParameters *ap)
849 {
850 RTSPState *rt = s->priv_data;
851 char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
852 URLContext *rtsp_hd;
853 int port, i, j, ret, err;
854 RTSPHeader reply1, *reply = &reply1;
855 unsigned char *content = NULL;
856 RTSPStream *rtsp_st;
857 int protocol_mask = 0;
858 AVStream *st;
859
860 /* extract hostname and port */
861 url_split(NULL, 0, NULL, 0,
862 host, sizeof(host), &port, path, sizeof(path), s->filename);
863 if (port < 0)
864 port = RTSP_DEFAULT_PORT;
865
866 /* search for options */
867 option_list = strchr(path, '?');
868 if (option_list) {
869 /* remove the options from the path */
870 *option_list++ = 0;
871 while(option_list) {
872 /* move the option pointer */
873 option = option_list;
874 option_list = strchr(option_list, '&');
875 if (option_list)
876 *(option_list++) = 0;
877 /* handle the options */
878 if (strcmp(option, "udp") == 0)
879 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
880 else if (strcmp(option, "multicast") == 0)
881 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
882 else if (strcmp(option, "tcp") == 0)
883 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
884 }
885 }
886
887 if (!protocol_mask)
888 protocol_mask = rtsp_default_protocols;
889
890 /* open the tcp connexion */
891 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
892 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
893 return AVERROR(EIO);
894 rt->rtsp_hd = rtsp_hd;
895 rt->seq = 0;
896
897 /* describe the stream */
898 snprintf(cmd, sizeof(cmd),
899 "DESCRIBE %s RTSP/1.0\r\n"
900 "Accept: application/sdp\r\n",
901 s->filename);
902 rtsp_send_cmd(s, cmd, reply, &content);
903 if (!content) {
904 err = AVERROR_INVALIDDATA;
905 goto fail;
906 }
907 if (reply->status_code != RTSP_STATUS_OK) {
908 err = AVERROR_INVALIDDATA;
909 goto fail;
910 }
911
912 /* now we got the SDP description, we parse it */
913 ret = sdp_parse(s, (const char *)content);
914 av_freep(&content);
915 if (ret < 0) {
916 err = AVERROR_INVALIDDATA;
917 goto fail;
918 }
919
920 /* for each stream, make the setup request */
921 /* XXX: we assume the same server is used for the control of each
922 RTSP stream */
923
924 for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
925 char transport[2048];
926
927 rtsp_st = rt->rtsp_streams[i];
928
929 /* compute available transports */
930 transport[0] = '\0';
931
932 /* RTP/UDP */
933 if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
934 char buf[256];
935
936 /* first try in specified port range */
937 if (RTSP_RTP_PORT_MIN != 0) {
938 while(j <= RTSP_RTP_PORT_MAX) {
939 snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
940 j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
941 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
942 goto rtp_opened;
943 }
944 }
945 }
946
947 /* then try on any port
948 ** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
949 ** err = AVERROR_INVALIDDATA;
950 ** goto fail;
951 ** }
952 */
953
954 rtp_opened:
955 port = rtp_get_local_port(rtsp_st->rtp_handle);
956 if (transport[0] != '\0')
957 av_strlcat(transport, ",", sizeof(transport));
958 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
959 "RTP/AVP/UDP;unicast;client_port=%d-%d",
960 port, port + 1);
961 }
962
963 /* RTP/TCP */
964 else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
965 if (transport[0] != '\0')
966 av_strlcat(transport, ",", sizeof(transport));
967 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
968 "RTP/AVP/TCP");
969 }
970
971 else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
972 if (transport[0] != '\0')
973 av_strlcat(transport, ",", sizeof(transport));
974 snprintf(transport + strlen(transport),
975 sizeof(transport) - strlen(transport) - 1,
976 "RTP/AVP/UDP;multicast");
977 }
978 snprintf(cmd, sizeof(cmd),
979 "SETUP %s RTSP/1.0\r\n"
980 "Transport: %s\r\n",
981 rtsp_st->control_url, transport);
982 rtsp_send_cmd(s, cmd, reply, NULL);
983 if (reply->status_code != RTSP_STATUS_OK ||
984 reply->nb_transports != 1) {
985 err = AVERROR_INVALIDDATA;
986 goto fail;
987 }
988
989 /* XXX: same protocol for all streams is required */
990 if (i > 0) {
991 if (reply->transports[0].protocol != rt->protocol) {
992 err = AVERROR_INVALIDDATA;
993 goto fail;
994 }
995 } else {
996 rt->protocol = reply->transports[0].protocol;
997 }
998
999 /* close RTP connection if not choosen */
1000 if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
1001 (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
1002 url_close(rtsp_st->rtp_handle);
1003 rtsp_st->rtp_handle = NULL;
1004 }
1005
1006 switch(reply->transports[0].protocol) {
1007 case RTSP_PROTOCOL_RTP_TCP:
1008 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1009 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1010 break;
1011
1012 case RTSP_PROTOCOL_RTP_UDP:
1013 {
1014 char url[1024];
1015
1016 /* XXX: also use address if specified */
1017 snprintf(url, sizeof(url), "rtp://%s:%d",
1018 host, reply->transports[0].server_port_min);
1019 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1020 err = AVERROR_INVALIDDATA;
1021 goto fail;
1022 }
1023 }
1024 break;
1025 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1026 {
1027 char url[1024];
1028 struct in_addr in;
1029
1030 in.s_addr = htonl(reply->transports[0].destination);
1031 snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1032 inet_ntoa(in),
1033 reply->transports[0].port_min,
1034 reply->transports[0].ttl);
1035 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1036 err = AVERROR_INVALIDDATA;
1037 goto fail;
1038 }
1039 }
1040 break;
1041 }
1042 /* open the RTP context */
1043 st = NULL;
1044 if (rtsp_st->stream_index >= 0)
1045 st = s->streams[rtsp_st->stream_index];
1046 if (!st)
1047 s->ctx_flags |= AVFMTCTX_NOHEADER;
1048 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1049
1050 if (!rtsp_st->rtp_ctx) {
1051 err = AVERROR(ENOMEM);
1052 goto fail;
1053 } else {
1054 if(rtsp_st->dynamic_handler) {
1055 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1056 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1057 }
1058 }
1059 }
1060
1061 rt->state = RTSP_STATE_IDLE;
1062 rt->seek_timestamp = 0; /* default is to start stream at position
1063 zero */
1064 if (ap->initial_pause) {
1065 /* do not start immediately */
1066 } else {
1067 if (rtsp_read_play(s) < 0) {
1068 err = AVERROR_INVALIDDATA;
1069 goto fail;
1070 }
1071 }
1072 return 0;
1073 fail:
1074 rtsp_close_streams(rt);
1075 av_freep(&content);
1076 url_close(rt->rtsp_hd);
1077 return err;
1078 }
1079
1080 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1081 uint8_t *buf, int buf_size)
1082 {
1083 RTSPState *rt = s->priv_data;
1084 int id, len, i, ret;
1085 RTSPStream *rtsp_st;
1086
1087 #ifdef DEBUG_RTP_TCP
1088 printf("tcp_read_packet:\n");
1089 #endif
1090 redo:
1091 for(;;) {
1092 ret = url_readbuf(rt->rtsp_hd, buf, 1);
1093 #ifdef DEBUG_RTP_TCP
1094 printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1095 #endif
1096 if (ret != 1)
1097 return -1;
1098 if (buf[0] == '$')
1099 break;
1100 }
1101 ret = url_readbuf(rt->rtsp_hd, buf, 3);
1102 if (ret != 3)
1103 return -1;
1104 id = buf[0];
1105 len = AV_RB16(buf + 1);
1106 #ifdef DEBUG_RTP_TCP
1107 printf("id=%d len=%d\n", id, len);
1108 #endif
1109 if (len > buf_size || len < 12)
1110 goto redo;
1111 /* get the data */
1112 ret = url_readbuf(rt->rtsp_hd, buf, len);
1113 if (ret != len)
1114 return -1;
1115
1116 /* find the matching stream */
1117 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1118 rtsp_st = rt->rtsp_streams[i];
1119 if (id >= rtsp_st->interleaved_min &&
1120 id <= rtsp_st->interleaved_max)
1121 goto found;
1122 }
1123 goto redo;
1124 found:
1125 *prtsp_st = rtsp_st;
1126 return len;
1127 }
1128
1129 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1130 uint8_t *buf, int buf_size)
1131 {
1132 RTSPState *rt = s->priv_data;
1133 RTSPStream *rtsp_st;
1134 fd_set rfds;
1135 int fd1, fd2, fd_max, n, i, ret;
1136 struct timeval tv;
1137
1138 for(;;) {
1139 if (url_interrupt_cb())
1140 return AVERROR(EINTR);
1141 FD_ZERO(&rfds);
1142 fd_max = -1;
1143 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1144 rtsp_st = rt->rtsp_streams[i];
1145 /* currently, we cannot probe RTCP handle because of blocking restrictions */
1146 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1147 if (fd1 > fd_max)
1148 fd_max = fd1;
1149 FD_SET(fd1, &rfds);
1150 }
1151 tv.tv_sec = 0;
1152 tv.tv_usec = 100 * 1000;
1153 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1154 if (n > 0) {
1155 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1156 rtsp_st = rt->rtsp_streams[i];
1157 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1158 if (FD_ISSET(fd1, &rfds)) {
1159 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1160 if (ret > 0) {
1161 *prtsp_st = rtsp_st;
1162 return ret;
1163 }
1164 }
1165 }
1166 }
1167 }
1168 }
1169
1170 static int rtsp_read_packet(AVFormatContext *s,
1171 AVPacket *pkt)
1172 {
1173 RTSPState *rt = s->priv_data;
1174 RTSPStream *rtsp_st;
1175 int ret, len;
1176 uint8_t buf[RTP_MAX_PACKET_LENGTH];
1177
1178 /* get next frames from the same RTP packet */
1179 if (rt->cur_rtp) {
1180 ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1181 if (ret == 0) {
1182 rt->cur_rtp = NULL;
1183 return 0;
1184 } else if (ret == 1) {
1185 return 0;
1186 } else {
1187 rt->cur_rtp = NULL;
1188 }
1189 }
1190
1191 /* read next RTP packet */
1192 redo:
1193 switch(rt->protocol) {
1194 default:
1195 case RTSP_PROTOCOL_RTP_TCP:
1196 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1197 break;
1198 case RTSP_PROTOCOL_RTP_UDP:
1199 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1200 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1201 if (len >=0 && rtsp_st->rtp_ctx)
1202 rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1203 break;
1204 }
1205 if (len < 0)
1206 return len;
1207 ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1208 if (ret < 0)
1209 goto redo;
1210 if (ret == 1) {
1211 /* more packets may follow, so we save the RTP context */
1212 rt->cur_rtp = rtsp_st->rtp_ctx;
1213 }
1214 return 0;
1215 }
1216
1217 static int rtsp_read_play(AVFormatContext *s)
1218 {
1219 RTSPState *rt = s->priv_data;
1220 RTSPHeader reply1, *reply = &reply1;
1221 char cmd[1024];
1222
1223 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1224
1225 if (rt->state == RTSP_STATE_PAUSED) {
1226 snprintf(cmd, sizeof(cmd),
1227 "PLAY %s RTSP/1.0\r\n",
1228 s->filename);
1229 } else {
1230 snprintf(cmd, sizeof(cmd),
1231 "PLAY %s RTSP/1.0\r\n"
1232 "Range: npt=%0.3f-\r\n",
1233 s->filename,
1234 (double)rt->seek_timestamp / AV_TIME_BASE);
1235 }
1236 rtsp_send_cmd(s, cmd, reply, NULL);
1237 if (reply->status_code != RTSP_STATUS_OK) {
1238 return -1;
1239 } else {
1240 rt->state = RTSP_STATE_PLAYING;
1241 return 0;
1242 }
1243 }
1244
1245 /* pause the stream */
1246 static int rtsp_read_pause(AVFormatContext *s)
1247 {
1248 RTSPState *rt = s->priv_data;
1249 RTSPHeader reply1, *reply = &reply1;
1250 char cmd[1024];
1251
1252 rt = s->priv_data;
1253
1254 if (rt->state != RTSP_STATE_PLAYING)
1255 return 0;
1256
1257 snprintf(cmd, sizeof(cmd),
1258 "PAUSE %s RTSP/1.0\r\n",
1259 s->filename);
1260 rtsp_send_cmd(s, cmd, reply, NULL);
1261 if (reply->status_code != RTSP_STATUS_OK) {
1262 return -1;
1263 } else {
1264 rt->state = RTSP_STATE_PAUSED;
1265 return 0;
1266 }
1267 }
1268
1269 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1270 int64_t timestamp, int flags)
1271 {
1272 RTSPState *rt = s->priv_data;
1273
1274 rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1275 switch(rt->state) {
1276 default:
1277 case RTSP_STATE_IDLE:
1278 break;
1279 case RTSP_STATE_PLAYING:
1280 if (rtsp_read_play(s) != 0)
1281 return -1;
1282 break;
1283 case RTSP_STATE_PAUSED:
1284 rt->state = RTSP_STATE_IDLE;
1285 break;
1286 }
1287 return 0;
1288 }
1289
1290 static int rtsp_read_close(AVFormatContext *s)
1291 {
1292 RTSPState *rt = s->priv_data;
1293 RTSPHeader reply1, *reply = &reply1;
1294 char cmd[1024];
1295
1296 #if 0
1297 /* NOTE: it is valid to flush the buffer here */
1298 if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1299 url_fclose(&rt->rtsp_gb);
1300 }
1301 #endif
1302 snprintf(cmd, sizeof(cmd),
1303 "TEARDOWN %s RTSP/1.0\r\n",
1304 s->filename);
1305 rtsp_send_cmd(s, cmd, reply, NULL);
1306
1307 rtsp_close_streams(rt);
1308 url_close(rt->rtsp_hd);
1309 return 0;
1310 }
1311
1312 #ifdef CONFIG_RTSP_DEMUXER
1313 AVInputFormat rtsp_demuxer = {
1314 "rtsp",
1315 "RTSP input format",
1316 sizeof(RTSPState),
1317 rtsp_probe,
1318 rtsp_read_header,
1319 rtsp_read_packet,
1320 rtsp_read_close,
1321 rtsp_read_seek,
1322 .flags = AVFMT_NOFILE,
1323 .read_play = rtsp_read_play,
1324 .read_pause = rtsp_read_pause,
1325 };
1326 #endif
1327
1328 static int sdp_probe(AVProbeData *p1)
1329 {
1330 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1331
1332 /* we look for a line beginning "c=IN IP4" */
1333 while (p < p_end && *p != '\0') {
1334 if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1335 return AVPROBE_SCORE_MAX / 2;
1336
1337 while(p < p_end - 1 && *p != '\n') p++;
1338 if (++p >= p_end)
1339 break;
1340 if (*p == '\r')
1341 p++;
1342 }
1343 return 0;
1344 }
1345
1346 #define SDP_MAX_SIZE 8192
1347
1348 static int sdp_read_header(AVFormatContext *s,
1349 AVFormatParameters *ap)
1350 {
1351 RTSPState *rt = s->priv_data;
1352 RTSPStream *rtsp_st;
1353 int size, i, err;
1354 char *content;
1355 char url[1024];
1356 AVStream *st;
1357
1358 /* read the whole sdp file */
1359 /* XXX: better loading */
1360 content = av_malloc(SDP_MAX_SIZE);
1361 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1362 if (size <= 0) {
1363 av_free(content);
1364 return AVERROR_INVALIDDATA;
1365 }
1366 content[size] ='\0';
1367
1368 sdp_parse(s, content);
1369 av_free(content);
1370
1371 /* open each RTP stream */
1372 for(i=0;i<rt->nb_rtsp_streams;i++) {
1373 rtsp_st = rt->rtsp_streams[i];
1374
1375 snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1376 inet_ntoa(rtsp_st->sdp_ip),
1377 rtsp_st->sdp_port,
1378 rtsp_st->sdp_ttl);
1379 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1380 err = AVERROR_INVALIDDATA;
1381 goto fail;
1382 }
1383 /* open the RTP context */
1384 st = NULL;
1385 if (rtsp_st->stream_index >= 0)
1386 st = s->streams[rtsp_st->stream_index];
1387 if (!st)
1388 s->ctx_flags |= AVFMTCTX_NOHEADER;
1389 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1390 if (!rtsp_st->rtp_ctx) {
1391 err = AVERROR(ENOMEM);
1392 goto fail;
1393 } else {
1394 if(rtsp_st->dynamic_handler) {
1395 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1396 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1397 }
1398 }
1399 }
1400 return 0;
1401 fail:
1402 rtsp_close_streams(rt);
1403 return err;
1404 }
1405
1406 static int sdp_read_packet(AVFormatContext *s,
1407 AVPacket *pkt)
1408 {
1409 return rtsp_read_packet(s, pkt);
1410 }
1411
1412 static int sdp_read_close(AVFormatContext *s)
1413 {
1414 RTSPState *rt = s->priv_data;
1415 rtsp_close_streams(rt);
1416 return 0;
1417 }
1418
1419 #ifdef CONFIG_SDP_DEMUXER
1420 AVInputFormat sdp_demuxer = {
1421 "sdp",
1422 "SDP",
1423 sizeof(RTSPState),
1424 sdp_probe,
1425 sdp_read_header,
1426 sdp_read_packet,
1427 sdp_read_close,
1428 };
1429 #endif
1430
1431 #ifdef CONFIG_REDIR_DEMUXER
1432 /* dummy redirector format (used directly in av_open_input_file now) */
1433 static int redir_probe(AVProbeData *pd)
1434 {
1435 const char *p;
1436 p = pd->buf;
1437 while (redir_isspace(*p))
1438 p++;
1439 if (av_strstart(p, "http://", NULL) ||
1440 av_strstart(p, "rtsp://", NULL))
1441 return AVPROBE_SCORE_MAX;
1442 return 0;
1443 }
1444
1445 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1446 {
1447 char buf[4096], *q;
1448 int c;
1449 AVFormatContext *ic = NULL;
1450 ByteIOContext *f = s->pb;
1451
1452 /* parse each URL and try to open it */
1453 c = url_fgetc(f);
1454 while (c != URL_EOF) {
1455 /* skip spaces */
1456 for(;;) {
1457 if (!redir_isspace(c))
1458 break;
1459 c = url_fgetc(f);
1460 }
1461 if (c == URL_EOF)
1462 break;
1463 /* record url */
1464 q = buf;
1465 for(;;) {
1466 if (c == URL_EOF || redir_isspace(c))
1467 break;
1468 if ((q - buf) < sizeof(buf) - 1)
1469 *q++ = c;
1470 c = url_fgetc(f);
1471 }
1472 *q = '\0';
1473 //printf("URL='%s'\n", buf);
1474 /* try to open the media file */
1475 if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1476 break;
1477 }
1478 if (!ic)
1479 return AVERROR(EIO);
1480
1481 *s = *ic;
1482 url_fclose(f);
1483
1484 return 0;
1485 }
1486
1487 AVInputFormat redir_demuxer = {
1488 "redir",
1489 "Redirector format",
1490 0,
1491 redir_probe,
1492 redir_read_header,
1493 NULL,
1494 NULL,
1495 };
1496 #endif