Implement RTSPServerType enum as a way to identify the flavour of RTSP that
[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
22 /* needed by inet_aton() */
23 #define _SVID_SOURCE
24
25 #include "libavutil/avstring.h"
26 #include "avformat.h"
27
28 #include <sys/time.h>
29 #include <unistd.h> /* for select() prototype */
30 #include <strings.h>
31 #include "network.h"
32 #include "rtsp.h"
33
34 #include "rtp_internal.h"
35
36 //#define DEBUG
37 //#define DEBUG_RTP_TCP
38
39 enum RTSPClientState {
40 RTSP_STATE_IDLE,
41 RTSP_STATE_PLAYING,
42 RTSP_STATE_PAUSED,
43 };
44
45 enum RTSPServerType {
46 RTSP_SERVER_RTP, /*< Standard-compliant RTP-server */
47 RTSP_SERVER_RDT, /*< Realmedia-style server */
48 RTSP_SERVER_LAST
49 };
50
51 typedef struct RTSPState {
52 URLContext *rtsp_hd; /* RTSP TCP connexion handle */
53 int nb_rtsp_streams;
54 struct RTSPStream **rtsp_streams;
55
56 enum RTSPClientState state;
57 int64_t seek_timestamp;
58
59 /* XXX: currently we use unbuffered input */
60 // ByteIOContext rtsp_gb;
61 int seq; /* RTSP command sequence number */
62 char session_id[512];
63 enum RTSPProtocol protocol;
64 enum RTSPServerType server_type;
65 char last_reply[2048]; /* XXX: allocate ? */
66 RTPDemuxContext *cur_rtp;
67 } RTSPState;
68
69 typedef struct RTSPStream {
70 URLContext *rtp_handle; /* RTP stream handle */
71 RTPDemuxContext *rtp_ctx; /* RTP parse context */
72
73 int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
74 int interleaved_min, interleaved_max; /* interleave ids, if TCP transport */
75 char control_url[1024]; /* url for this stream (from SDP) */
76
77 int sdp_port; /* port (from SDP content - not used in RTSP) */
78 struct in_addr sdp_ip; /* IP address (from SDP content - not used in RTSP) */
79 int sdp_ttl; /* IP TTL (from SDP content - not used in RTSP) */
80 int sdp_payload_type; /* payload type - only used in SDP */
81 rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
82
83 RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
84 void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
85 } RTSPStream;
86
87 static int rtsp_read_play(AVFormatContext *s);
88
89 /* XXX: currently, the only way to change the protocols consists in
90 changing this variable */
91
92 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
93 int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
94 #endif
95
96 static int rtsp_probe(AVProbeData *p)
97 {
98 if (av_strstart(p->filename, "rtsp:", NULL))
99 return AVPROBE_SCORE_MAX;
100 return 0;
101 }
102
103 static int redir_isspace(int c)
104 {
105 return c == ' ' || c == '\t' || c == '\n' || c == '\r';
106 }
107
108 static void skip_spaces(const char **pp)
109 {
110 const char *p;
111 p = *pp;
112 while (redir_isspace(*p))
113 p++;
114 *pp = p;
115 }
116
117 static void get_word_sep(char *buf, int buf_size, const char *sep,
118 const char **pp)
119 {
120 const char *p;
121 char *q;
122
123 p = *pp;
124 if (*p == '/')
125 p++;
126 skip_spaces(&p);
127 q = buf;
128 while (!strchr(sep, *p) && *p != '\0') {
129 if ((q - buf) < buf_size - 1)
130 *q++ = *p;
131 p++;
132 }
133 if (buf_size > 0)
134 *q = '\0';
135 *pp = p;
136 }
137
138 static void get_word(char *buf, int buf_size, const char **pp)
139 {
140 const char *p;
141 char *q;
142
143 p = *pp;
144 skip_spaces(&p);
145 q = buf;
146 while (!redir_isspace(*p) && *p != '\0') {
147 if ((q - buf) < buf_size - 1)
148 *q++ = *p;
149 p++;
150 }
151 if (buf_size > 0)
152 *q = '\0';
153 *pp = p;
154 }
155
156 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
157 params>] */
158 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
159 {
160 char buf[256];
161 int i;
162 AVCodec *c;
163 const char *c_name;
164
165 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
166 see if we can handle this kind of payload */
167 get_word_sep(buf, sizeof(buf), "/", &p);
168 if (payload_type >= RTP_PT_PRIVATE) {
169 RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
170 while(handler) {
171 if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
172 codec->codec_id = handler->codec_id;
173 rtsp_st->dynamic_handler= handler;
174 if(handler->open) {
175 rtsp_st->dynamic_protocol_context= handler->open();
176 }
177 break;
178 }
179 handler= handler->next;
180 }
181 } else {
182 /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
183 /* search into AVRtpPayloadTypes[] */
184 codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
185 }
186
187 c = avcodec_find_decoder(codec->codec_id);
188 if (c && c->name)
189 c_name = c->name;
190 else
191 c_name = (char *)NULL;
192
193 if (c_name) {
194 get_word_sep(buf, sizeof(buf), "/", &p);
195 i = atoi(buf);
196 switch (codec->codec_type) {
197 case CODEC_TYPE_AUDIO:
198 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
199 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
200 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
201 if (i > 0) {
202 codec->sample_rate = i;
203 get_word_sep(buf, sizeof(buf), "/", &p);
204 i = atoi(buf);
205 if (i > 0)
206 codec->channels = i;
207 // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
208 // frequency. No problem, but the sample rate is being set here by the sdp line. Upcoming patch forthcoming. (rdm)
209 }
210 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
211 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
212 break;
213 case CODEC_TYPE_VIDEO:
214 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
215 break;
216 default:
217 break;
218 }
219 return 0;
220 }
221
222 return -1;
223 }
224
225 /* return the length and optionnaly the data */
226 static int hex_to_data(uint8_t *data, const char *p)
227 {
228 int c, len, v;
229
230 len = 0;
231 v = 1;
232 for(;;) {
233 skip_spaces(&p);
234 if (p == '\0')
235 break;
236 c = toupper((unsigned char)*p++);
237 if (c >= '0' && c <= '9')
238 c = c - '0';
239 else if (c >= 'A' && c <= 'F')
240 c = c - 'A' + 10;
241 else
242 break;
243 v = (v << 4) | c;
244 if (v & 0x100) {
245 if (data)
246 data[len] = v;
247 len++;
248 v = 1;
249 }
250 }
251 return len;
252 }
253
254 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
255 {
256 switch (codec->codec_id) {
257 case CODEC_ID_MPEG4:
258 case CODEC_ID_AAC:
259 if (!strcmp(attr, "config")) {
260 /* decode the hexa encoded parameter */
261 int len = hex_to_data(NULL, value);
262 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
263 if (!codec->extradata)
264 return;
265 codec->extradata_size = len;
266 hex_to_data(codec->extradata, value);
267 }
268 break;
269 default:
270 break;
271 }
272 return;
273 }
274
275 typedef struct attrname_map
276 {
277 const char *str;
278 uint16_t type;
279 uint32_t offset;
280 } attrname_map_t;
281
282 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
283 #define ATTR_NAME_TYPE_INT 0
284 #define ATTR_NAME_TYPE_STR 1
285 static attrname_map_t attr_names[]=
286 {
287 {"SizeLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
288 {"IndexLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
289 {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
290 {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
291 {"StreamType", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
292 {"mode", ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
293 {NULL, -1, -1},
294 };
295
296 /** parse the attribute line from the fmtp a line of an sdp resonse. This is broken out as a function
297 * because it is used in rtp_h264.c, which is forthcoming.
298 */
299 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
300 {
301 skip_spaces(p);
302 if(**p)
303 {
304 get_word_sep(attr, attr_size, "=", p);
305 if (**p == '=')
306 (*p)++;
307 get_word_sep(value, value_size, ";", p);
308 if (**p == ';')
309 (*p)++;
310 return 1;
311 }
312 return 0;
313 }
314
315 /* parse a SDP line and save stream attributes */
316 static void sdp_parse_fmtp(AVStream *st, const char *p)
317 {
318 char attr[256];
319 char value[4096];
320 int i;
321
322 RTSPStream *rtsp_st = st->priv_data;
323 AVCodecContext *codec = st->codec;
324 rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
325
326 /* loop on each attribute */
327 while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
328 {
329 /* grab the codec extra_data from the config parameter of the fmtp line */
330 sdp_parse_fmtp_config(codec, attr, value);
331 /* Looking for a known attribute */
332 for (i = 0; attr_names[i].str; ++i) {
333 if (!strcasecmp(attr, attr_names[i].str)) {
334 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
335 *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
336 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
337 *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
338 }
339 }
340 }
341 }
342
343 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
344 * and end time.
345 * Used for seeking in the rtp stream.
346 */
347 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
348 {
349 char buf[256];
350
351 skip_spaces(&p);
352 if (!av_stristart(p, "npt=", &p))
353 return;
354
355 *start = AV_NOPTS_VALUE;
356 *end = AV_NOPTS_VALUE;
357
358 get_word_sep(buf, sizeof(buf), "-", &p);
359 *start = parse_date(buf, 1);
360 if (*p == '-') {
361 p++;
362 get_word_sep(buf, sizeof(buf), "-", &p);
363 *end = parse_date(buf, 1);
364 }
365 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
366 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
367 }
368
369 typedef struct SDPParseState {
370 /* SDP only */
371 struct in_addr default_ip;
372 int default_ttl;
373 } SDPParseState;
374
375 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
376 int letter, const char *buf)
377 {
378 RTSPState *rt = s->priv_data;
379 char buf1[64], st_type[64];
380 const char *p;
381 int codec_type, payload_type, i;
382 AVStream *st;
383 RTSPStream *rtsp_st;
384 struct in_addr sdp_ip;
385 int ttl;
386
387 #ifdef DEBUG
388 printf("sdp: %c='%s'\n", letter, buf);
389 #endif
390
391 p = buf;
392 switch(letter) {
393 case 'c':
394 get_word(buf1, sizeof(buf1), &p);
395 if (strcmp(buf1, "IN") != 0)
396 return;
397 get_word(buf1, sizeof(buf1), &p);
398 if (strcmp(buf1, "IP4") != 0)
399 return;
400 get_word_sep(buf1, sizeof(buf1), "/", &p);
401 if (inet_aton(buf1, &sdp_ip) == 0)
402 return;
403 ttl = 16;
404 if (*p == '/') {
405 p++;
406 get_word_sep(buf1, sizeof(buf1), "/", &p);
407 ttl = atoi(buf1);
408 }
409 if (s->nb_streams == 0) {
410 s1->default_ip = sdp_ip;
411 s1->default_ttl = ttl;
412 } else {
413 st = s->streams[s->nb_streams - 1];
414 rtsp_st = st->priv_data;
415 rtsp_st->sdp_ip = sdp_ip;
416 rtsp_st->sdp_ttl = ttl;
417 }
418 break;
419 case 's':
420 av_strlcpy(s->title, p, sizeof(s->title));
421 break;
422 case 'i':
423 if (s->nb_streams == 0) {
424 av_strlcpy(s->comment, p, sizeof(s->comment));
425 break;
426 }
427 break;
428 case 'm':
429 /* new stream */
430 get_word(st_type, sizeof(st_type), &p);
431 if (!strcmp(st_type, "audio")) {
432 codec_type = CODEC_TYPE_AUDIO;
433 } else if (!strcmp(st_type, "video")) {
434 codec_type = CODEC_TYPE_VIDEO;
435 } else {
436 return;
437 }
438 rtsp_st = av_mallocz(sizeof(RTSPStream));
439 if (!rtsp_st)
440 return;
441 rtsp_st->stream_index = -1;
442 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
443
444 rtsp_st->sdp_ip = s1->default_ip;
445 rtsp_st->sdp_ttl = s1->default_ttl;
446
447 get_word(buf1, sizeof(buf1), &p); /* port */
448 rtsp_st->sdp_port = atoi(buf1);
449
450 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
451
452 /* XXX: handle list of formats */
453 get_word(buf1, sizeof(buf1), &p); /* format list */
454 rtsp_st->sdp_payload_type = atoi(buf1);
455
456 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
457 /* no corresponding stream */
458 } else {
459 st = av_new_stream(s, 0);
460 if (!st)
461 return;
462 st->priv_data = rtsp_st;
463 rtsp_st->stream_index = st->index;
464 st->codec->codec_type = codec_type;
465 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
466 /* if standard payload type, we can find the codec right now */
467 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
468 }
469 }
470 /* put a default control url */
471 av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
472 break;
473 case 'a':
474 if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
475 char proto[32];
476 /* get the control url */
477 st = s->streams[s->nb_streams - 1];
478 rtsp_st = st->priv_data;
479
480 /* XXX: may need to add full url resolution */
481 url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
482 if (proto[0] == '\0') {
483 /* relative control URL */
484 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
485 av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
486 } else {
487 av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
488 }
489 } else if (av_strstart(p, "rtpmap:", &p)) {
490 /* NOTE: rtpmap is only supported AFTER the 'm=' 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 sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
498 }
499 }
500 } else if (av_strstart(p, "fmtp:", &p)) {
501 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
502 get_word(buf1, sizeof(buf1), &p);
503 payload_type = atoi(buf1);
504 for(i = 0; i < s->nb_streams;i++) {
505 st = s->streams[i];
506 rtsp_st = st->priv_data;
507 if (rtsp_st->sdp_payload_type == payload_type) {
508 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
509 if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
510 sdp_parse_fmtp(st, p);
511 }
512 } else {
513 sdp_parse_fmtp(st, p);
514 }
515 }
516 }
517 } else if(av_strstart(p, "framesize:", &p)) {
518 // let dynamic protocol handlers have a stab at the line.
519 get_word(buf1, sizeof(buf1), &p);
520 payload_type = atoi(buf1);
521 for(i = 0; i < s->nb_streams;i++) {
522 st = s->streams[i];
523 rtsp_st = st->priv_data;
524 if (rtsp_st->sdp_payload_type == payload_type) {
525 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
526 rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
527 }
528 }
529 }
530 } else if(av_strstart(p, "range:", &p)) {
531 int64_t start, end;
532
533 // this is so that seeking on a streamed file can work.
534 rtsp_parse_range_npt(p, &start, &end);
535 s->start_time= start;
536 s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
537 } else if (s->nb_streams > 0) {
538 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
539 if (rtsp_st->dynamic_handler &&
540 rtsp_st->dynamic_handler->parse_sdp_a_line)
541 rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1],
542 rtsp_st->dynamic_protocol_context, buf);
543 }
544 break;
545 }
546 }
547
548 static int sdp_parse(AVFormatContext *s, const char *content)
549 {
550 const char *p;
551 int letter;
552 char buf[1024], *q;
553 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
554
555 memset(s1, 0, sizeof(SDPParseState));
556 p = content;
557 for(;;) {
558 skip_spaces(&p);
559 letter = *p;
560 if (letter == '\0')
561 break;
562 p++;
563 if (*p != '=')
564 goto next_line;
565 p++;
566 /* get the content */
567 q = buf;
568 while (*p != '\n' && *p != '\r' && *p != '\0') {
569 if ((q - buf) < sizeof(buf) - 1)
570 *q++ = *p;
571 p++;
572 }
573 *q = '\0';
574 sdp_parse_line(s, s1, letter, buf);
575 next_line:
576 while (*p != '\n' && *p != '\0')
577 p++;
578 if (*p == '\n')
579 p++;
580 }
581 return 0;
582 }
583
584 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
585 {
586 const char *p;
587 int v;
588
589 p = *pp;
590 skip_spaces(&p);
591 v = strtol(p, (char **)&p, 10);
592 if (*p == '-') {
593 p++;
594 *min_ptr = v;
595 v = strtol(p, (char **)&p, 10);
596 *max_ptr = v;
597 } else {
598 *min_ptr = v;
599 *max_ptr = v;
600 }
601 *pp = p;
602 }
603
604 /* XXX: only one transport specification is parsed */
605 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
606 {
607 char transport_protocol[16];
608 char profile[16];
609 char lower_transport[16];
610 char parameter[16];
611 RTSPTransportField *th;
612 char buf[256];
613
614 reply->nb_transports = 0;
615
616 for(;;) {
617 skip_spaces(&p);
618 if (*p == '\0')
619 break;
620
621 th = &reply->transports[reply->nb_transports];
622
623 get_word_sep(transport_protocol, sizeof(transport_protocol),
624 "/", &p);
625 if (*p == '/')
626 p++;
627 if (!strcasecmp (transport_protocol, "rtp")) {
628 get_word_sep(profile, sizeof(profile), "/;,", &p);
629 lower_transport[0] = '\0';
630 /* rtp/avp/<protocol> */
631 if (*p == '/') {
632 p++;
633 get_word_sep(lower_transport, sizeof(lower_transport),
634 ";,", &p);
635 }
636 } else if (!strcasecmp (transport_protocol, "x-pn-tng")) {
637 /* x-pn-tng/<protocol> */
638 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
639 profile[0] = '\0';
640 }
641 if (!strcasecmp(lower_transport, "TCP"))
642 th->protocol = RTSP_PROTOCOL_RTP_TCP;
643 else
644 th->protocol = RTSP_PROTOCOL_RTP_UDP;
645
646 if (*p == ';')
647 p++;
648 /* get each parameter */
649 while (*p != '\0' && *p != ',') {
650 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
651 if (!strcmp(parameter, "port")) {
652 if (*p == '=') {
653 p++;
654 rtsp_parse_range(&th->port_min, &th->port_max, &p);
655 }
656 } else if (!strcmp(parameter, "client_port")) {
657 if (*p == '=') {
658 p++;
659 rtsp_parse_range(&th->client_port_min,
660 &th->client_port_max, &p);
661 }
662 } else if (!strcmp(parameter, "server_port")) {
663 if (*p == '=') {
664 p++;
665 rtsp_parse_range(&th->server_port_min,
666 &th->server_port_max, &p);
667 }
668 } else if (!strcmp(parameter, "interleaved")) {
669 if (*p == '=') {
670 p++;
671 rtsp_parse_range(&th->interleaved_min,
672 &th->interleaved_max, &p);
673 }
674 } else if (!strcmp(parameter, "multicast")) {
675 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
676 th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
677 } else if (!strcmp(parameter, "ttl")) {
678 if (*p == '=') {
679 p++;
680 th->ttl = strtol(p, (char **)&p, 10);
681 }
682 } else if (!strcmp(parameter, "destination")) {
683 struct in_addr ipaddr;
684
685 if (*p == '=') {
686 p++;
687 get_word_sep(buf, sizeof(buf), ";,", &p);
688 if (inet_aton(buf, &ipaddr))
689 th->destination = ntohl(ipaddr.s_addr);
690 }
691 }
692 while (*p != ';' && *p != '\0' && *p != ',')
693 p++;
694 if (*p == ';')
695 p++;
696 }
697 if (*p == ',')
698 p++;
699
700 reply->nb_transports++;
701 }
702 }
703
704 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
705 {
706 const char *p;
707
708 /* NOTE: we do case independent match for broken servers */
709 p = buf;
710 if (av_stristart(p, "Session:", &p)) {
711 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
712 } else if (av_stristart(p, "Content-Length:", &p)) {
713 reply->content_length = strtol(p, NULL, 10);
714 } else if (av_stristart(p, "Transport:", &p)) {
715 rtsp_parse_transport(reply, p);
716 } else if (av_stristart(p, "CSeq:", &p)) {
717 reply->seq = strtol(p, NULL, 10);
718 } else if (av_stristart(p, "Range:", &p)) {
719 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
720 }
721 }
722
723 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
724 {
725 int ret, len;
726
727 len = 0;
728 while (len < size) {
729 ret = url_read(h, buf+len, size-len);
730 if (ret < 1)
731 return ret;
732 len += ret;
733 }
734 return len;
735 }
736
737 /* skip a RTP/TCP interleaved packet */
738 static void rtsp_skip_packet(AVFormatContext *s)
739 {
740 RTSPState *rt = s->priv_data;
741 int ret, len, len1;
742 uint8_t buf[1024];
743
744 ret = url_readbuf(rt->rtsp_hd, buf, 3);
745 if (ret != 3)
746 return;
747 len = AV_RB16(buf + 1);
748 #ifdef DEBUG
749 printf("skipping RTP packet len=%d\n", len);
750 #endif
751 /* skip payload */
752 while (len > 0) {
753 len1 = len;
754 if (len1 > sizeof(buf))
755 len1 = sizeof(buf);
756 ret = url_readbuf(rt->rtsp_hd, buf, len1);
757 if (ret != len1)
758 return;
759 len -= len1;
760 }
761 }
762
763 static void rtsp_send_cmd(AVFormatContext *s,
764 const char *cmd, RTSPHeader *reply,
765 unsigned char **content_ptr)
766 {
767 RTSPState *rt = s->priv_data;
768 char buf[4096], buf1[1024], *q;
769 unsigned char ch;
770 const char *p;
771 int content_length, line_count;
772 unsigned char *content = NULL;
773
774 memset(reply, 0, sizeof(RTSPHeader));
775
776 rt->seq++;
777 av_strlcpy(buf, cmd, sizeof(buf));
778 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
779 av_strlcat(buf, buf1, sizeof(buf));
780 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
781 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
782 av_strlcat(buf, buf1, sizeof(buf));
783 }
784 av_strlcat(buf, "\r\n", sizeof(buf));
785 #ifdef DEBUG
786 printf("Sending:\n%s--\n", buf);
787 #endif
788 url_write(rt->rtsp_hd, buf, strlen(buf));
789
790 /* parse reply (XXX: use buffers) */
791 line_count = 0;
792 rt->last_reply[0] = '\0';
793 for(;;) {
794 q = buf;
795 for(;;) {
796 if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
797 break;
798 if (ch == '\n')
799 break;
800 if (ch == '$') {
801 /* XXX: only parse it if first char on line ? */
802 rtsp_skip_packet(s);
803 } else if (ch != '\r') {
804 if ((q - buf) < sizeof(buf) - 1)
805 *q++ = ch;
806 }
807 }
808 *q = '\0';
809 #ifdef DEBUG
810 printf("line='%s'\n", buf);
811 #endif
812 /* test if last line */
813 if (buf[0] == '\0')
814 break;
815 p = buf;
816 if (line_count == 0) {
817 /* get reply code */
818 get_word(buf1, sizeof(buf1), &p);
819 get_word(buf1, sizeof(buf1), &p);
820 reply->status_code = atoi(buf1);
821 } else {
822 rtsp_parse_line(reply, p);
823 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
824 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
825 }
826 line_count++;
827 }
828
829 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
830 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
831
832 content_length = reply->content_length;
833 if (content_length > 0) {
834 /* leave some room for a trailing '\0' (useful for simple parsing) */
835 content = av_malloc(content_length + 1);
836 (void)url_readbuf(rt->rtsp_hd, content, content_length);
837 content[content_length] = '\0';
838 }
839 if (content_ptr)
840 *content_ptr = content;
841 else
842 av_free(content);
843 }
844
845
846 /* close and free RTSP streams */
847 static void rtsp_close_streams(RTSPState *rt)
848 {
849 int i;
850 RTSPStream *rtsp_st;
851
852 for(i=0;i<rt->nb_rtsp_streams;i++) {
853 rtsp_st = rt->rtsp_streams[i];
854 if (rtsp_st) {
855 if (rtsp_st->rtp_ctx)
856 rtp_parse_close(rtsp_st->rtp_ctx);
857 if (rtsp_st->rtp_handle)
858 url_close(rtsp_st->rtp_handle);
859 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
860 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
861 }
862 }
863 av_free(rt->rtsp_streams);
864 }
865
866 /**
867 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
868 */
869 static int
870 make_setup_request (AVFormatContext *s, const char *host, int port, int protocol)
871 {
872 RTSPState *rt = s->priv_data;
873 int j, i, err;
874 RTSPStream *rtsp_st;
875 AVStream *st;
876 RTSPHeader reply1, *reply = &reply1;
877 char cmd[2048];
878
879 /* for each stream, make the setup request */
880 /* XXX: we assume the same server is used for the control of each
881 RTSP stream */
882
883 for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
884 char transport[2048];
885
886 rtsp_st = rt->rtsp_streams[i];
887
888 /* compute available transports */
889 transport[0] = '\0';
890
891 /* RTP/UDP */
892 if (protocol == RTSP_PROTOCOL_RTP_UDP) {
893 char buf[256];
894
895 /* first try in specified port range */
896 if (RTSP_RTP_PORT_MIN != 0) {
897 while(j <= RTSP_RTP_PORT_MAX) {
898 snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
899 j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
900 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
901 goto rtp_opened;
902 }
903 }
904 }
905
906 /* then try on any port
907 ** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
908 ** err = AVERROR_INVALIDDATA;
909 ** goto fail;
910 ** }
911 */
912
913 rtp_opened:
914 port = rtp_get_local_port(rtsp_st->rtp_handle);
915 if (transport[0] != '\0')
916 av_strlcat(transport, ",", sizeof(transport));
917 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
918 "RTP/AVP/UDP;unicast;client_port=%d-%d",
919 port, port + 1);
920 }
921
922 /* RTP/TCP */
923 else if (protocol == RTSP_PROTOCOL_RTP_TCP) {
924 if (transport[0] != '\0')
925 av_strlcat(transport, ",", sizeof(transport));
926 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
927 "RTP/AVP/TCP");
928 }
929
930 else if (protocol == RTSP_PROTOCOL_RTP_UDP_MULTICAST) {
931 if (transport[0] != '\0')
932 av_strlcat(transport, ",", sizeof(transport));
933 snprintf(transport + strlen(transport),
934 sizeof(transport) - strlen(transport) - 1,
935 "RTP/AVP/UDP;multicast");
936 }
937 snprintf(cmd, sizeof(cmd),
938 "SETUP %s RTSP/1.0\r\n"
939 "Transport: %s\r\n",
940 rtsp_st->control_url, transport);
941 rtsp_send_cmd(s, cmd, reply, NULL);
942 if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
943 err = 1;
944 goto fail;
945 } else if (reply->status_code != RTSP_STATUS_OK ||
946 reply->nb_transports != 1) {
947 err = AVERROR_INVALIDDATA;
948 goto fail;
949 }
950
951 /* XXX: same protocol for all streams is required */
952 if (i > 0) {
953 if (reply->transports[0].protocol != rt->protocol) {
954 err = AVERROR_INVALIDDATA;
955 goto fail;
956 }
957 } else {
958 rt->protocol = reply->transports[0].protocol;
959 }
960
961 /* close RTP connection if not choosen */
962 if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
963 (protocol == RTSP_PROTOCOL_RTP_UDP)) {
964 url_close(rtsp_st->rtp_handle);
965 rtsp_st->rtp_handle = NULL;
966 }
967
968 switch(reply->transports[0].protocol) {
969 case RTSP_PROTOCOL_RTP_TCP:
970 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
971 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
972 break;
973
974 case RTSP_PROTOCOL_RTP_UDP:
975 {
976 char url[1024];
977
978 /* XXX: also use address if specified */
979 snprintf(url, sizeof(url), "rtp://%s:%d",
980 host, reply->transports[0].server_port_min);
981 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
982 err = AVERROR_INVALIDDATA;
983 goto fail;
984 }
985 }
986 break;
987 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
988 {
989 char url[1024];
990 struct in_addr in;
991
992 in.s_addr = htonl(reply->transports[0].destination);
993 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
994 inet_ntoa(in),
995 reply->transports[0].port_min,
996 reply->transports[0].ttl);
997 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
998 err = AVERROR_INVALIDDATA;
999 goto fail;
1000 }
1001 }
1002 break;
1003 }
1004 /* open the RTP context */
1005 st = NULL;
1006 if (rtsp_st->stream_index >= 0)
1007 st = s->streams[rtsp_st->stream_index];
1008 if (!st)
1009 s->ctx_flags |= AVFMTCTX_NOHEADER;
1010 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1011
1012 if (!rtsp_st->rtp_ctx) {
1013 err = AVERROR(ENOMEM);
1014 goto fail;
1015 } else {
1016 if(rtsp_st->dynamic_handler) {
1017 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1018 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1019 }
1020 }
1021 }
1022
1023 return 0;
1024
1025 fail:
1026 for (i=0; i<rt->nb_rtsp_streams; i++) {
1027 if (rt->rtsp_streams[i]->rtp_handle) {
1028 url_close(rt->rtsp_streams[i]->rtp_handle);
1029 rt->rtsp_streams[i]->rtp_handle = NULL;
1030 }
1031 }
1032 return err;
1033 }
1034
1035 static int rtsp_read_header(AVFormatContext *s,
1036 AVFormatParameters *ap)
1037 {
1038 RTSPState *rt = s->priv_data;
1039 char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1040 URLContext *rtsp_hd;
1041 int port, ret, err;
1042 RTSPHeader reply1, *reply = &reply1;
1043 unsigned char *content = NULL;
1044 int protocol_mask = 0;
1045
1046 /* extract hostname and port */
1047 url_split(NULL, 0, NULL, 0,
1048 host, sizeof(host), &port, path, sizeof(path), s->filename);
1049 if (port < 0)
1050 port = RTSP_DEFAULT_PORT;
1051
1052 /* search for options */
1053 option_list = strchr(path, '?');
1054 if (option_list) {
1055 /* remove the options from the path */
1056 *option_list++ = 0;
1057 while(option_list) {
1058 /* move the option pointer */
1059 option = option_list;
1060 option_list = strchr(option_list, '&');
1061 if (option_list)
1062 *(option_list++) = 0;
1063 /* handle the options */
1064 if (strcmp(option, "udp") == 0)
1065 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
1066 else if (strcmp(option, "multicast") == 0)
1067 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
1068 else if (strcmp(option, "tcp") == 0)
1069 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
1070 }
1071 }
1072
1073 if (!protocol_mask)
1074 protocol_mask = (1 << RTSP_PROTOCOL_RTP_LAST) - 1;
1075
1076 /* open the tcp connexion */
1077 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1078 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1079 return AVERROR(EIO);
1080 rt->rtsp_hd = rtsp_hd;
1081 rt->seq = 0;
1082
1083 /* describe the stream */
1084 snprintf(cmd, sizeof(cmd),
1085 "DESCRIBE %s RTSP/1.0\r\n"
1086 "Accept: application/sdp\r\n",
1087 s->filename);
1088 rtsp_send_cmd(s, cmd, reply, &content);
1089 if (!content) {
1090 err = AVERROR_INVALIDDATA;
1091 goto fail;
1092 }
1093 if (reply->status_code != RTSP_STATUS_OK) {
1094 err = AVERROR_INVALIDDATA;
1095 goto fail;
1096 }
1097
1098 /* now we got the SDP description, we parse it */
1099 ret = sdp_parse(s, (const char *)content);
1100 av_freep(&content);
1101 if (ret < 0) {
1102 err = AVERROR_INVALIDDATA;
1103 goto fail;
1104 }
1105
1106 do {
1107 int protocol = ff_log2_tab[protocol_mask & ~(protocol_mask - 1)];
1108
1109 err = make_setup_request(s, host, port, protocol);
1110 if (err < 0)
1111 goto fail;
1112 protocol_mask &= ~(1 << protocol);
1113 if (protocol_mask == 0 && err == 1) {
1114 err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1115 goto fail;
1116 }
1117 } while (err);
1118
1119 rt->state = RTSP_STATE_IDLE;
1120 rt->seek_timestamp = 0; /* default is to start stream at position
1121 zero */
1122 if (ap->initial_pause) {
1123 /* do not start immediately */
1124 } else {
1125 if (rtsp_read_play(s) < 0) {
1126 err = AVERROR_INVALIDDATA;
1127 goto fail;
1128 }
1129 }
1130 return 0;
1131 fail:
1132 rtsp_close_streams(rt);
1133 av_freep(&content);
1134 url_close(rt->rtsp_hd);
1135 return err;
1136 }
1137
1138 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1139 uint8_t *buf, int buf_size)
1140 {
1141 RTSPState *rt = s->priv_data;
1142 int id, len, i, ret;
1143 RTSPStream *rtsp_st;
1144
1145 #ifdef DEBUG_RTP_TCP
1146 printf("tcp_read_packet:\n");
1147 #endif
1148 redo:
1149 for(;;) {
1150 ret = url_readbuf(rt->rtsp_hd, buf, 1);
1151 #ifdef DEBUG_RTP_TCP
1152 printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1153 #endif
1154 if (ret != 1)
1155 return -1;
1156 if (buf[0] == '$')
1157 break;
1158 }
1159 ret = url_readbuf(rt->rtsp_hd, buf, 3);
1160 if (ret != 3)
1161 return -1;
1162 id = buf[0];
1163 len = AV_RB16(buf + 1);
1164 #ifdef DEBUG_RTP_TCP
1165 printf("id=%d len=%d\n", id, len);
1166 #endif
1167 if (len > buf_size || len < 12)
1168 goto redo;
1169 /* get the data */
1170 ret = url_readbuf(rt->rtsp_hd, buf, len);
1171 if (ret != len)
1172 return -1;
1173
1174 /* find the matching stream */
1175 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1176 rtsp_st = rt->rtsp_streams[i];
1177 if (id >= rtsp_st->interleaved_min &&
1178 id <= rtsp_st->interleaved_max)
1179 goto found;
1180 }
1181 goto redo;
1182 found:
1183 *prtsp_st = rtsp_st;
1184 return len;
1185 }
1186
1187 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1188 uint8_t *buf, int buf_size)
1189 {
1190 RTSPState *rt = s->priv_data;
1191 RTSPStream *rtsp_st;
1192 fd_set rfds;
1193 int fd1, fd2, fd_max, n, i, ret;
1194 struct timeval tv;
1195
1196 for(;;) {
1197 if (url_interrupt_cb())
1198 return AVERROR(EINTR);
1199 FD_ZERO(&rfds);
1200 fd_max = -1;
1201 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1202 rtsp_st = rt->rtsp_streams[i];
1203 /* currently, we cannot probe RTCP handle because of blocking restrictions */
1204 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1205 if (fd1 > fd_max)
1206 fd_max = fd1;
1207 FD_SET(fd1, &rfds);
1208 }
1209 tv.tv_sec = 0;
1210 tv.tv_usec = 100 * 1000;
1211 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1212 if (n > 0) {
1213 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1214 rtsp_st = rt->rtsp_streams[i];
1215 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1216 if (FD_ISSET(fd1, &rfds)) {
1217 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1218 if (ret > 0) {
1219 *prtsp_st = rtsp_st;
1220 return ret;
1221 }
1222 }
1223 }
1224 }
1225 }
1226 }
1227
1228 static int rtsp_read_packet(AVFormatContext *s,
1229 AVPacket *pkt)
1230 {
1231 RTSPState *rt = s->priv_data;
1232 RTSPStream *rtsp_st;
1233 int ret, len;
1234 uint8_t buf[RTP_MAX_PACKET_LENGTH];
1235
1236 /* get next frames from the same RTP packet */
1237 if (rt->cur_rtp) {
1238 ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1239 if (ret == 0) {
1240 rt->cur_rtp = NULL;
1241 return 0;
1242 } else if (ret == 1) {
1243 return 0;
1244 } else {
1245 rt->cur_rtp = NULL;
1246 }
1247 }
1248
1249 /* read next RTP packet */
1250 redo:
1251 switch(rt->protocol) {
1252 default:
1253 case RTSP_PROTOCOL_RTP_TCP:
1254 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1255 break;
1256 case RTSP_PROTOCOL_RTP_UDP:
1257 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1258 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1259 if (len >=0 && rtsp_st->rtp_ctx)
1260 rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1261 break;
1262 }
1263 if (len < 0)
1264 return len;
1265 ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1266 if (ret < 0)
1267 goto redo;
1268 if (ret == 1) {
1269 /* more packets may follow, so we save the RTP context */
1270 rt->cur_rtp = rtsp_st->rtp_ctx;
1271 }
1272 return 0;
1273 }
1274
1275 static int rtsp_read_play(AVFormatContext *s)
1276 {
1277 RTSPState *rt = s->priv_data;
1278 RTSPHeader reply1, *reply = &reply1;
1279 char cmd[1024];
1280
1281 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1282
1283 if (rt->state == RTSP_STATE_PAUSED) {
1284 snprintf(cmd, sizeof(cmd),
1285 "PLAY %s RTSP/1.0\r\n",
1286 s->filename);
1287 } else {
1288 snprintf(cmd, sizeof(cmd),
1289 "PLAY %s RTSP/1.0\r\n"
1290 "Range: npt=%0.3f-\r\n",
1291 s->filename,
1292 (double)rt->seek_timestamp / AV_TIME_BASE);
1293 }
1294 rtsp_send_cmd(s, cmd, reply, NULL);
1295 if (reply->status_code != RTSP_STATUS_OK) {
1296 return -1;
1297 } else {
1298 rt->state = RTSP_STATE_PLAYING;
1299 return 0;
1300 }
1301 }
1302
1303 /* pause the stream */
1304 static int rtsp_read_pause(AVFormatContext *s)
1305 {
1306 RTSPState *rt = s->priv_data;
1307 RTSPHeader reply1, *reply = &reply1;
1308 char cmd[1024];
1309
1310 rt = s->priv_data;
1311
1312 if (rt->state != RTSP_STATE_PLAYING)
1313 return 0;
1314
1315 snprintf(cmd, sizeof(cmd),
1316 "PAUSE %s RTSP/1.0\r\n",
1317 s->filename);
1318 rtsp_send_cmd(s, cmd, reply, NULL);
1319 if (reply->status_code != RTSP_STATUS_OK) {
1320 return -1;
1321 } else {
1322 rt->state = RTSP_STATE_PAUSED;
1323 return 0;
1324 }
1325 }
1326
1327 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1328 int64_t timestamp, int flags)
1329 {
1330 RTSPState *rt = s->priv_data;
1331
1332 rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1333 switch(rt->state) {
1334 default:
1335 case RTSP_STATE_IDLE:
1336 break;
1337 case RTSP_STATE_PLAYING:
1338 if (rtsp_read_play(s) != 0)
1339 return -1;
1340 break;
1341 case RTSP_STATE_PAUSED:
1342 rt->state = RTSP_STATE_IDLE;
1343 break;
1344 }
1345 return 0;
1346 }
1347
1348 static int rtsp_read_close(AVFormatContext *s)
1349 {
1350 RTSPState *rt = s->priv_data;
1351 RTSPHeader reply1, *reply = &reply1;
1352 char cmd[1024];
1353
1354 #if 0
1355 /* NOTE: it is valid to flush the buffer here */
1356 if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1357 url_fclose(&rt->rtsp_gb);
1358 }
1359 #endif
1360 snprintf(cmd, sizeof(cmd),
1361 "TEARDOWN %s RTSP/1.0\r\n",
1362 s->filename);
1363 rtsp_send_cmd(s, cmd, reply, NULL);
1364
1365 rtsp_close_streams(rt);
1366 url_close(rt->rtsp_hd);
1367 return 0;
1368 }
1369
1370 #ifdef CONFIG_RTSP_DEMUXER
1371 AVInputFormat rtsp_demuxer = {
1372 "rtsp",
1373 NULL_IF_CONFIG_SMALL("RTSP input format"),
1374 sizeof(RTSPState),
1375 rtsp_probe,
1376 rtsp_read_header,
1377 rtsp_read_packet,
1378 rtsp_read_close,
1379 rtsp_read_seek,
1380 .flags = AVFMT_NOFILE,
1381 .read_play = rtsp_read_play,
1382 .read_pause = rtsp_read_pause,
1383 };
1384 #endif
1385
1386 static int sdp_probe(AVProbeData *p1)
1387 {
1388 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1389
1390 /* we look for a line beginning "c=IN IP4" */
1391 while (p < p_end && *p != '\0') {
1392 if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1393 return AVPROBE_SCORE_MAX / 2;
1394
1395 while(p < p_end - 1 && *p != '\n') p++;
1396 if (++p >= p_end)
1397 break;
1398 if (*p == '\r')
1399 p++;
1400 }
1401 return 0;
1402 }
1403
1404 #define SDP_MAX_SIZE 8192
1405
1406 static int sdp_read_header(AVFormatContext *s,
1407 AVFormatParameters *ap)
1408 {
1409 RTSPState *rt = s->priv_data;
1410 RTSPStream *rtsp_st;
1411 int size, i, err;
1412 char *content;
1413 char url[1024];
1414 AVStream *st;
1415
1416 /* read the whole sdp file */
1417 /* XXX: better loading */
1418 content = av_malloc(SDP_MAX_SIZE);
1419 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1420 if (size <= 0) {
1421 av_free(content);
1422 return AVERROR_INVALIDDATA;
1423 }
1424 content[size] ='\0';
1425
1426 sdp_parse(s, content);
1427 av_free(content);
1428
1429 /* open each RTP stream */
1430 for(i=0;i<rt->nb_rtsp_streams;i++) {
1431 rtsp_st = rt->rtsp_streams[i];
1432
1433 snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1434 inet_ntoa(rtsp_st->sdp_ip),
1435 rtsp_st->sdp_port,
1436 rtsp_st->sdp_port,
1437 rtsp_st->sdp_ttl);
1438 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1439 err = AVERROR_INVALIDDATA;
1440 goto fail;
1441 }
1442 /* open the RTP context */
1443 st = NULL;
1444 if (rtsp_st->stream_index >= 0)
1445 st = s->streams[rtsp_st->stream_index];
1446 if (!st)
1447 s->ctx_flags |= AVFMTCTX_NOHEADER;
1448 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1449 if (!rtsp_st->rtp_ctx) {
1450 err = AVERROR(ENOMEM);
1451 goto fail;
1452 } else {
1453 if(rtsp_st->dynamic_handler) {
1454 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1455 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1456 }
1457 }
1458 }
1459 return 0;
1460 fail:
1461 rtsp_close_streams(rt);
1462 return err;
1463 }
1464
1465 static int sdp_read_packet(AVFormatContext *s,
1466 AVPacket *pkt)
1467 {
1468 return rtsp_read_packet(s, pkt);
1469 }
1470
1471 static int sdp_read_close(AVFormatContext *s)
1472 {
1473 RTSPState *rt = s->priv_data;
1474 rtsp_close_streams(rt);
1475 return 0;
1476 }
1477
1478 #ifdef CONFIG_SDP_DEMUXER
1479 AVInputFormat sdp_demuxer = {
1480 "sdp",
1481 NULL_IF_CONFIG_SMALL("SDP"),
1482 sizeof(RTSPState),
1483 sdp_probe,
1484 sdp_read_header,
1485 sdp_read_packet,
1486 sdp_read_close,
1487 };
1488 #endif
1489
1490 #ifdef CONFIG_REDIR_DEMUXER
1491 /* dummy redirector format (used directly in av_open_input_file now) */
1492 static int redir_probe(AVProbeData *pd)
1493 {
1494 const char *p;
1495 p = pd->buf;
1496 while (redir_isspace(*p))
1497 p++;
1498 if (av_strstart(p, "http://", NULL) ||
1499 av_strstart(p, "rtsp://", NULL))
1500 return AVPROBE_SCORE_MAX;
1501 return 0;
1502 }
1503
1504 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1505 {
1506 char buf[4096], *q;
1507 int c;
1508 AVFormatContext *ic = NULL;
1509 ByteIOContext *f = s->pb;
1510
1511 /* parse each URL and try to open it */
1512 c = url_fgetc(f);
1513 while (c != URL_EOF) {
1514 /* skip spaces */
1515 for(;;) {
1516 if (!redir_isspace(c))
1517 break;
1518 c = url_fgetc(f);
1519 }
1520 if (c == URL_EOF)
1521 break;
1522 /* record url */
1523 q = buf;
1524 for(;;) {
1525 if (c == URL_EOF || redir_isspace(c))
1526 break;
1527 if ((q - buf) < sizeof(buf) - 1)
1528 *q++ = c;
1529 c = url_fgetc(f);
1530 }
1531 *q = '\0';
1532 //printf("URL='%s'\n", buf);
1533 /* try to open the media file */
1534 if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1535 break;
1536 }
1537 if (!ic)
1538 return AVERROR(EIO);
1539
1540 *s = *ic;
1541 url_fclose(f);
1542
1543 return 0;
1544 }
1545
1546 AVInputFormat redir_demuxer = {
1547 "redir",
1548 NULL_IF_CONFIG_SMALL("Redirector format"),
1549 0,
1550 redir_probe,
1551 redir_read_header,
1552 NULL,
1553 NULL,
1554 };
1555 #endif