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