Add comment to indicate why the SDP line buffer is as big as it is.
[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 #ifdef HAVE_SYS_SELECT_H
30 #include <sys/select.h>
31 #endif
32 #include <strings.h>
33 #include "network.h"
34 #include "rtsp.h"
35
36 #include "rtp_internal.h"
37 #include "rdt.h"
38
39 //#define DEBUG
40 //#define DEBUG_RTP_TCP
41
42 enum RTSPClientState {
43 RTSP_STATE_IDLE,
44 RTSP_STATE_PLAYING,
45 RTSP_STATE_PAUSED,
46 };
47
48 enum RTSPServerType {
49 RTSP_SERVER_RTP, /*< Standard-compliant RTP-server */
50 RTSP_SERVER_REAL, /*< Realmedia-style server */
51 RTSP_SERVER_LAST
52 };
53
54 enum RTSPTransport {
55 RTSP_TRANSPORT_RTP,
56 RTSP_TRANSPORT_RDT,
57 RTSP_TRANSPORT_LAST
58 };
59
60 typedef struct RTSPState {
61 URLContext *rtsp_hd; /* RTSP TCP connexion handle */
62 int nb_rtsp_streams;
63 struct RTSPStream **rtsp_streams;
64
65 enum RTSPClientState state;
66 int64_t seek_timestamp;
67
68 /* XXX: currently we use unbuffered input */
69 // ByteIOContext rtsp_gb;
70 int seq; /* RTSP command sequence number */
71 char session_id[512];
72 enum RTSPTransport transport;
73 enum RTSPLowerTransport lower_transport;
74 enum RTSPServerType server_type;
75 char last_reply[2048]; /* XXX: allocate ? */
76 void *cur_tx;
77 int need_subscription;
78 } RTSPState;
79
80 typedef struct RTSPStream {
81 URLContext *rtp_handle; /* RTP stream handle */
82 void *tx_ctx; /* RTP/RDT parse context */
83
84 int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
85 int interleaved_min, interleaved_max; /* interleave ids, if TCP transport */
86 char control_url[1024]; /* url for this stream (from SDP) */
87
88 int sdp_port; /* port (from SDP content - not used in RTSP) */
89 struct in_addr sdp_ip; /* IP address (from SDP content - not used in RTSP) */
90 int sdp_ttl; /* IP TTL (from SDP content - not used in RTSP) */
91 int sdp_payload_type; /* payload type - only used in SDP */
92 RTPPayloadData rtp_payload_data; /* rtp payload parsing infos from SDP */
93
94 RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
95 PayloadContext *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
96 } RTSPStream;
97
98 static int rtsp_read_play(AVFormatContext *s);
99
100 /* XXX: currently, the only way to change the protocols consists in
101 changing this variable */
102
103 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
104 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
105 #endif
106
107 static int rtsp_probe(AVProbeData *p)
108 {
109 if (av_strstart(p->filename, "rtsp:", NULL))
110 return AVPROBE_SCORE_MAX;
111 return 0;
112 }
113
114 static int redir_isspace(int c)
115 {
116 return c == ' ' || c == '\t' || c == '\n' || c == '\r';
117 }
118
119 static void skip_spaces(const char **pp)
120 {
121 const char *p;
122 p = *pp;
123 while (redir_isspace(*p))
124 p++;
125 *pp = p;
126 }
127
128 static void get_word_sep(char *buf, int buf_size, const char *sep,
129 const char **pp)
130 {
131 const char *p;
132 char *q;
133
134 p = *pp;
135 if (*p == '/')
136 p++;
137 skip_spaces(&p);
138 q = buf;
139 while (!strchr(sep, *p) && *p != '\0') {
140 if ((q - buf) < buf_size - 1)
141 *q++ = *p;
142 p++;
143 }
144 if (buf_size > 0)
145 *q = '\0';
146 *pp = p;
147 }
148
149 static void get_word(char *buf, int buf_size, const char **pp)
150 {
151 const char *p;
152 char *q;
153
154 p = *pp;
155 skip_spaces(&p);
156 q = buf;
157 while (!redir_isspace(*p) && *p != '\0') {
158 if ((q - buf) < buf_size - 1)
159 *q++ = *p;
160 p++;
161 }
162 if (buf_size > 0)
163 *q = '\0';
164 *pp = p;
165 }
166
167 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
168 params>] */
169 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
170 {
171 char buf[256];
172 int i;
173 AVCodec *c;
174 const char *c_name;
175
176 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
177 see if we can handle this kind of payload */
178 get_word_sep(buf, sizeof(buf), "/", &p);
179 if (payload_type >= RTP_PT_PRIVATE) {
180 RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
181 while(handler) {
182 if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
183 codec->codec_id = handler->codec_id;
184 rtsp_st->dynamic_handler= handler;
185 if(handler->open) {
186 rtsp_st->dynamic_protocol_context= handler->open();
187 }
188 break;
189 }
190 handler= handler->next;
191 }
192 } else {
193 /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
194 /* search into AVRtpPayloadTypes[] */
195 codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
196 }
197
198 c = avcodec_find_decoder(codec->codec_id);
199 if (c && c->name)
200 c_name = c->name;
201 else
202 c_name = (char *)NULL;
203
204 if (c_name) {
205 get_word_sep(buf, sizeof(buf), "/", &p);
206 i = atoi(buf);
207 switch (codec->codec_type) {
208 case CODEC_TYPE_AUDIO:
209 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
210 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
211 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
212 if (i > 0) {
213 codec->sample_rate = i;
214 get_word_sep(buf, sizeof(buf), "/", &p);
215 i = atoi(buf);
216 if (i > 0)
217 codec->channels = i;
218 // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
219 // frequency. No problem, but the sample rate is being set here by the sdp line. Upcoming patch forthcoming. (rdm)
220 }
221 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
222 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
223 break;
224 case CODEC_TYPE_VIDEO:
225 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
226 break;
227 default:
228 break;
229 }
230 return 0;
231 }
232
233 return -1;
234 }
235
236 /* return the length and optionnaly the data */
237 static int hex_to_data(uint8_t *data, const char *p)
238 {
239 int c, len, v;
240
241 len = 0;
242 v = 1;
243 for(;;) {
244 skip_spaces(&p);
245 if (p == '\0')
246 break;
247 c = toupper((unsigned char)*p++);
248 if (c >= '0' && c <= '9')
249 c = c - '0';
250 else if (c >= 'A' && c <= 'F')
251 c = c - 'A' + 10;
252 else
253 break;
254 v = (v << 4) | c;
255 if (v & 0x100) {
256 if (data)
257 data[len] = v;
258 len++;
259 v = 1;
260 }
261 }
262 return len;
263 }
264
265 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
266 {
267 switch (codec->codec_id) {
268 case CODEC_ID_MPEG4:
269 case CODEC_ID_AAC:
270 if (!strcmp(attr, "config")) {
271 /* decode the hexa encoded parameter */
272 int len = hex_to_data(NULL, value);
273 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
274 if (!codec->extradata)
275 return;
276 codec->extradata_size = len;
277 hex_to_data(codec->extradata, value);
278 }
279 break;
280 default:
281 break;
282 }
283 return;
284 }
285
286 typedef struct {
287 const char *str;
288 uint16_t type;
289 uint32_t offset;
290 } AttrNameMap;
291
292 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
293 #define ATTR_NAME_TYPE_INT 0
294 #define ATTR_NAME_TYPE_STR 1
295 static const AttrNameMap attr_names[]=
296 {
297 {"SizeLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, sizelength)},
298 {"IndexLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexlength)},
299 {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexdeltalength)},
300 {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, profile_level_id)},
301 {"StreamType", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, streamtype)},
302 {"mode", ATTR_NAME_TYPE_STR, offsetof(RTPPayloadData, mode)},
303 {NULL, -1, -1},
304 };
305
306 /** parse the attribute line from the fmtp a line of an sdp resonse. This is broken out as a function
307 * because it is used in rtp_h264.c, which is forthcoming.
308 */
309 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
310 {
311 skip_spaces(p);
312 if(**p)
313 {
314 get_word_sep(attr, attr_size, "=", p);
315 if (**p == '=')
316 (*p)++;
317 get_word_sep(value, value_size, ";", p);
318 if (**p == ';')
319 (*p)++;
320 return 1;
321 }
322 return 0;
323 }
324
325 /* parse a SDP line and save stream attributes */
326 static void sdp_parse_fmtp(AVStream *st, const char *p)
327 {
328 char attr[256];
329 char value[4096];
330 int i;
331
332 RTSPStream *rtsp_st = st->priv_data;
333 AVCodecContext *codec = st->codec;
334 RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
335
336 /* loop on each attribute */
337 while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
338 {
339 /* grab the codec extra_data from the config parameter of the fmtp line */
340 sdp_parse_fmtp_config(codec, attr, value);
341 /* Looking for a known attribute */
342 for (i = 0; attr_names[i].str; ++i) {
343 if (!strcasecmp(attr, attr_names[i].str)) {
344 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
345 *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
346 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
347 *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
348 }
349 }
350 }
351 }
352
353 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
354 * and end time.
355 * Used for seeking in the rtp stream.
356 */
357 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
358 {
359 char buf[256];
360
361 skip_spaces(&p);
362 if (!av_stristart(p, "npt=", &p))
363 return;
364
365 *start = AV_NOPTS_VALUE;
366 *end = AV_NOPTS_VALUE;
367
368 get_word_sep(buf, sizeof(buf), "-", &p);
369 *start = parse_date(buf, 1);
370 if (*p == '-') {
371 p++;
372 get_word_sep(buf, sizeof(buf), "-", &p);
373 *end = parse_date(buf, 1);
374 }
375 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
376 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
377 }
378
379 typedef struct SDPParseState {
380 /* SDP only */
381 struct in_addr default_ip;
382 int default_ttl;
383 } SDPParseState;
384
385 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
386 int letter, const char *buf)
387 {
388 RTSPState *rt = s->priv_data;
389 char buf1[64], st_type[64];
390 const char *p;
391 enum CodecType codec_type;
392 int payload_type, i;
393 AVStream *st;
394 RTSPStream *rtsp_st;
395 struct in_addr sdp_ip;
396 int ttl;
397
398 #ifdef DEBUG
399 printf("sdp: %c='%s'\n", letter, buf);
400 #endif
401
402 p = buf;
403 switch(letter) {
404 case 'c':
405 get_word(buf1, sizeof(buf1), &p);
406 if (strcmp(buf1, "IN") != 0)
407 return;
408 get_word(buf1, sizeof(buf1), &p);
409 if (strcmp(buf1, "IP4") != 0)
410 return;
411 get_word_sep(buf1, sizeof(buf1), "/", &p);
412 if (inet_aton(buf1, &sdp_ip) == 0)
413 return;
414 ttl = 16;
415 if (*p == '/') {
416 p++;
417 get_word_sep(buf1, sizeof(buf1), "/", &p);
418 ttl = atoi(buf1);
419 }
420 if (s->nb_streams == 0) {
421 s1->default_ip = sdp_ip;
422 s1->default_ttl = ttl;
423 } else {
424 st = s->streams[s->nb_streams - 1];
425 rtsp_st = st->priv_data;
426 rtsp_st->sdp_ip = sdp_ip;
427 rtsp_st->sdp_ttl = ttl;
428 }
429 break;
430 case 's':
431 av_strlcpy(s->title, p, sizeof(s->title));
432 break;
433 case 'i':
434 if (s->nb_streams == 0) {
435 av_strlcpy(s->comment, p, sizeof(s->comment));
436 break;
437 }
438 break;
439 case 'm':
440 /* new stream */
441 get_word(st_type, sizeof(st_type), &p);
442 if (!strcmp(st_type, "audio")) {
443 codec_type = CODEC_TYPE_AUDIO;
444 } else if (!strcmp(st_type, "video")) {
445 codec_type = CODEC_TYPE_VIDEO;
446 } else {
447 return;
448 }
449 rtsp_st = av_mallocz(sizeof(RTSPStream));
450 if (!rtsp_st)
451 return;
452 rtsp_st->stream_index = -1;
453 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
454
455 rtsp_st->sdp_ip = s1->default_ip;
456 rtsp_st->sdp_ttl = s1->default_ttl;
457
458 get_word(buf1, sizeof(buf1), &p); /* port */
459 rtsp_st->sdp_port = atoi(buf1);
460
461 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
462
463 /* XXX: handle list of formats */
464 get_word(buf1, sizeof(buf1), &p); /* format list */
465 rtsp_st->sdp_payload_type = atoi(buf1);
466
467 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
468 /* no corresponding stream */
469 } else {
470 st = av_new_stream(s, 0);
471 if (!st)
472 return;
473 st->priv_data = rtsp_st;
474 rtsp_st->stream_index = st->index;
475 st->codec->codec_type = codec_type;
476 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
477 /* if standard payload type, we can find the codec right now */
478 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
479 }
480 }
481 /* put a default control url */
482 av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
483 break;
484 case 'a':
485 if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
486 char proto[32];
487 /* get the control url */
488 st = s->streams[s->nb_streams - 1];
489 rtsp_st = st->priv_data;
490
491 /* XXX: may need to add full url resolution */
492 url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
493 if (proto[0] == '\0') {
494 /* relative control URL */
495 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
496 av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
497 } else {
498 av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
499 }
500 } else if (av_strstart(p, "rtpmap:", &p)) {
501 /* NOTE: rtpmap is only supported AFTER the 'm=' 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 sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
509 }
510 }
511 } else if (av_strstart(p, "fmtp:", &p)) {
512 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
513 get_word(buf1, sizeof(buf1), &p);
514 payload_type = atoi(buf1);
515 for(i = 0; i < s->nb_streams;i++) {
516 st = s->streams[i];
517 rtsp_st = st->priv_data;
518 if (rtsp_st->sdp_payload_type == payload_type) {
519 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
520 if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
521 sdp_parse_fmtp(st, p);
522 }
523 } else {
524 sdp_parse_fmtp(st, p);
525 }
526 }
527 }
528 } else if(av_strstart(p, "framesize:", &p)) {
529 // let dynamic protocol handlers have a stab at the line.
530 get_word(buf1, sizeof(buf1), &p);
531 payload_type = atoi(buf1);
532 for(i = 0; i < s->nb_streams;i++) {
533 st = s->streams[i];
534 rtsp_st = st->priv_data;
535 if (rtsp_st->sdp_payload_type == payload_type) {
536 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
537 rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
538 }
539 }
540 }
541 } else if(av_strstart(p, "range:", &p)) {
542 int64_t start, end;
543
544 // this is so that seeking on a streamed file can work.
545 rtsp_parse_range_npt(p, &start, &end);
546 s->start_time= start;
547 s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
548 } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
549 if (atoi(p) == 1)
550 rt->transport = RTSP_TRANSPORT_RDT;
551 } else if (s->nb_streams > 0) {
552 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
553 if (rtsp_st->dynamic_handler &&
554 rtsp_st->dynamic_handler->parse_sdp_a_line)
555 rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
556 rtsp_st->dynamic_protocol_context, buf);
557 }
558 break;
559 }
560 }
561
562 static int sdp_parse(AVFormatContext *s, const char *content)
563 {
564 const char *p;
565 int letter;
566 /* Some SDP lines, particularly for Realmedia or ASF RTSP streams, contain long SDP
567 * lines containing complete ASF Headers (several kB) or arrays of MDPR (RM stream
568 * descriptor) headers plus "rulebooks" describing their properties. Therefore, the
569 * SDP line buffer is large. */
570 char buf[8192], *q;
571 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
572
573 memset(s1, 0, sizeof(SDPParseState));
574 p = content;
575 for(;;) {
576 skip_spaces(&p);
577 letter = *p;
578 if (letter == '\0')
579 break;
580 p++;
581 if (*p != '=')
582 goto next_line;
583 p++;
584 /* get the content */
585 q = buf;
586 while (*p != '\n' && *p != '\r' && *p != '\0') {
587 if ((q - buf) < sizeof(buf) - 1)
588 *q++ = *p;
589 p++;
590 }
591 *q = '\0';
592 sdp_parse_line(s, s1, letter, buf);
593 next_line:
594 while (*p != '\n' && *p != '\0')
595 p++;
596 if (*p == '\n')
597 p++;
598 }
599 return 0;
600 }
601
602 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
603 {
604 const char *p;
605 int v;
606
607 p = *pp;
608 skip_spaces(&p);
609 v = strtol(p, (char **)&p, 10);
610 if (*p == '-') {
611 p++;
612 *min_ptr = v;
613 v = strtol(p, (char **)&p, 10);
614 *max_ptr = v;
615 } else {
616 *min_ptr = v;
617 *max_ptr = v;
618 }
619 *pp = p;
620 }
621
622 /* XXX: only one transport specification is parsed */
623 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
624 {
625 char transport_protocol[16];
626 char profile[16];
627 char lower_transport[16];
628 char parameter[16];
629 RTSPTransportField *th;
630 char buf[256];
631
632 reply->nb_transports = 0;
633
634 for(;;) {
635 skip_spaces(&p);
636 if (*p == '\0')
637 break;
638
639 th = &reply->transports[reply->nb_transports];
640
641 get_word_sep(transport_protocol, sizeof(transport_protocol),
642 "/", &p);
643 if (*p == '/')
644 p++;
645 if (!strcasecmp (transport_protocol, "rtp")) {
646 get_word_sep(profile, sizeof(profile), "/;,", &p);
647 lower_transport[0] = '\0';
648 /* rtp/avp/<protocol> */
649 if (*p == '/') {
650 p++;
651 get_word_sep(lower_transport, sizeof(lower_transport),
652 ";,", &p);
653 }
654 th->transport = RTSP_TRANSPORT_RTP;
655 } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
656 !strcasecmp (transport_protocol, "x-real-rdt")) {
657 /* x-pn-tng/<protocol> */
658 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
659 profile[0] = '\0';
660 th->transport = RTSP_TRANSPORT_RDT;
661 }
662 if (!strcasecmp(lower_transport, "TCP"))
663 th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
664 else
665 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
666
667 if (*p == ';')
668 p++;
669 /* get each parameter */
670 while (*p != '\0' && *p != ',') {
671 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
672 if (!strcmp(parameter, "port")) {
673 if (*p == '=') {
674 p++;
675 rtsp_parse_range(&th->port_min, &th->port_max, &p);
676 }
677 } else if (!strcmp(parameter, "client_port")) {
678 if (*p == '=') {
679 p++;
680 rtsp_parse_range(&th->client_port_min,
681 &th->client_port_max, &p);
682 }
683 } else if (!strcmp(parameter, "server_port")) {
684 if (*p == '=') {
685 p++;
686 rtsp_parse_range(&th->server_port_min,
687 &th->server_port_max, &p);
688 }
689 } else if (!strcmp(parameter, "interleaved")) {
690 if (*p == '=') {
691 p++;
692 rtsp_parse_range(&th->interleaved_min,
693 &th->interleaved_max, &p);
694 }
695 } else if (!strcmp(parameter, "multicast")) {
696 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
697 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
698 } else if (!strcmp(parameter, "ttl")) {
699 if (*p == '=') {
700 p++;
701 th->ttl = strtol(p, (char **)&p, 10);
702 }
703 } else if (!strcmp(parameter, "destination")) {
704 struct in_addr ipaddr;
705
706 if (*p == '=') {
707 p++;
708 get_word_sep(buf, sizeof(buf), ";,", &p);
709 if (inet_aton(buf, &ipaddr))
710 th->destination = ntohl(ipaddr.s_addr);
711 }
712 }
713 while (*p != ';' && *p != '\0' && *p != ',')
714 p++;
715 if (*p == ';')
716 p++;
717 }
718 if (*p == ',')
719 p++;
720
721 reply->nb_transports++;
722 }
723 }
724
725 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
726 {
727 const char *p;
728
729 /* NOTE: we do case independent match for broken servers */
730 p = buf;
731 if (av_stristart(p, "Session:", &p)) {
732 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
733 } else if (av_stristart(p, "Content-Length:", &p)) {
734 reply->content_length = strtol(p, NULL, 10);
735 } else if (av_stristart(p, "Transport:", &p)) {
736 rtsp_parse_transport(reply, p);
737 } else if (av_stristart(p, "CSeq:", &p)) {
738 reply->seq = strtol(p, NULL, 10);
739 } else if (av_stristart(p, "Range:", &p)) {
740 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
741 } else if (av_stristart(p, "RealChallenge1:", &p)) {
742 skip_spaces(&p);
743 av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
744 }
745 }
746
747 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
748 {
749 int ret, len;
750
751 len = 0;
752 while (len < size) {
753 ret = url_read(h, buf+len, size-len);
754 if (ret < 1)
755 return ret;
756 len += ret;
757 }
758 return len;
759 }
760
761 /* skip a RTP/TCP interleaved packet */
762 static void rtsp_skip_packet(AVFormatContext *s)
763 {
764 RTSPState *rt = s->priv_data;
765 int ret, len, len1;
766 uint8_t buf[1024];
767
768 ret = url_readbuf(rt->rtsp_hd, buf, 3);
769 if (ret != 3)
770 return;
771 len = AV_RB16(buf + 1);
772 #ifdef DEBUG
773 printf("skipping RTP packet len=%d\n", len);
774 #endif
775 /* skip payload */
776 while (len > 0) {
777 len1 = len;
778 if (len1 > sizeof(buf))
779 len1 = sizeof(buf);
780 ret = url_readbuf(rt->rtsp_hd, buf, len1);
781 if (ret != len1)
782 return;
783 len -= len1;
784 }
785 }
786
787 static void rtsp_send_cmd(AVFormatContext *s,
788 const char *cmd, RTSPHeader *reply,
789 unsigned char **content_ptr)
790 {
791 RTSPState *rt = s->priv_data;
792 char buf[4096], buf1[1024], *q;
793 unsigned char ch;
794 const char *p;
795 int content_length, line_count;
796 unsigned char *content = NULL;
797
798 memset(reply, 0, sizeof(RTSPHeader));
799
800 rt->seq++;
801 av_strlcpy(buf, cmd, sizeof(buf));
802 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
803 av_strlcat(buf, buf1, sizeof(buf));
804 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
805 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
806 av_strlcat(buf, buf1, sizeof(buf));
807 }
808 av_strlcat(buf, "\r\n", sizeof(buf));
809 #ifdef DEBUG
810 printf("Sending:\n%s--\n", buf);
811 #endif
812 url_write(rt->rtsp_hd, buf, strlen(buf));
813
814 /* parse reply (XXX: use buffers) */
815 line_count = 0;
816 rt->last_reply[0] = '\0';
817 for(;;) {
818 q = buf;
819 for(;;) {
820 if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
821 break;
822 if (ch == '\n')
823 break;
824 if (ch == '$') {
825 /* XXX: only parse it if first char on line ? */
826 rtsp_skip_packet(s);
827 } else if (ch != '\r') {
828 if ((q - buf) < sizeof(buf) - 1)
829 *q++ = ch;
830 }
831 }
832 *q = '\0';
833 #ifdef DEBUG
834 printf("line='%s'\n", buf);
835 #endif
836 /* test if last line */
837 if (buf[0] == '\0')
838 break;
839 p = buf;
840 if (line_count == 0) {
841 /* get reply code */
842 get_word(buf1, sizeof(buf1), &p);
843 get_word(buf1, sizeof(buf1), &p);
844 reply->status_code = atoi(buf1);
845 } else {
846 rtsp_parse_line(reply, p);
847 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
848 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
849 }
850 line_count++;
851 }
852
853 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
854 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
855
856 content_length = reply->content_length;
857 if (content_length > 0) {
858 /* leave some room for a trailing '\0' (useful for simple parsing) */
859 content = av_malloc(content_length + 1);
860 (void)url_readbuf(rt->rtsp_hd, content, content_length);
861 content[content_length] = '\0';
862 }
863 if (content_ptr)
864 *content_ptr = content;
865 else
866 av_free(content);
867 }
868
869
870 /* close and free RTSP streams */
871 static void rtsp_close_streams(RTSPState *rt)
872 {
873 int i;
874 RTSPStream *rtsp_st;
875
876 for(i=0;i<rt->nb_rtsp_streams;i++) {
877 rtsp_st = rt->rtsp_streams[i];
878 if (rtsp_st) {
879 if (rtsp_st->tx_ctx) {
880 if (rt->transport == RTSP_TRANSPORT_RDT)
881 ff_rdt_parse_close(rtsp_st->tx_ctx);
882 else
883 rtp_parse_close(rtsp_st->tx_ctx);
884 }
885 if (rtsp_st->rtp_handle)
886 url_close(rtsp_st->rtp_handle);
887 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
888 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
889 }
890 }
891 av_free(rt->rtsp_streams);
892 }
893
894 static int
895 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
896 {
897 RTSPState *rt = s->priv_data;
898 AVStream *st = NULL;
899
900 /* open the RTP context */
901 if (rtsp_st->stream_index >= 0)
902 st = s->streams[rtsp_st->stream_index];
903 if (!st)
904 s->ctx_flags |= AVFMTCTX_NOHEADER;
905
906 if (rt->transport == RTSP_TRANSPORT_RDT)
907 rtsp_st->tx_ctx = ff_rdt_parse_open(s, st->index,
908 rtsp_st->dynamic_protocol_context,
909 rtsp_st->dynamic_handler);
910 else
911 rtsp_st->tx_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle,
912 rtsp_st->sdp_payload_type,
913 &rtsp_st->rtp_payload_data);
914
915 if (!rtsp_st->tx_ctx) {
916 return AVERROR(ENOMEM);
917 } else if (rt->transport != RTSP_TRANSPORT_RDT) {
918 if(rtsp_st->dynamic_handler) {
919 rtp_parse_set_dynamic_protocol(rtsp_st->tx_ctx,
920 rtsp_st->dynamic_protocol_context,
921 rtsp_st->dynamic_handler);
922 }
923 }
924
925 return 0;
926 }
927
928 /**
929 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
930 */
931 static int
932 make_setup_request (AVFormatContext *s, const char *host, int port,
933 int lower_transport, const char *real_challenge)
934 {
935 RTSPState *rt = s->priv_data;
936 int j, i, err;
937 RTSPStream *rtsp_st;
938 RTSPHeader reply1, *reply = &reply1;
939 char cmd[2048];
940 const char *trans_pref;
941
942 if (rt->transport == RTSP_TRANSPORT_RDT)
943 trans_pref = "x-pn-tng";
944 else
945 trans_pref = "RTP/AVP";
946
947 /* for each stream, make the setup request */
948 /* XXX: we assume the same server is used for the control of each
949 RTSP stream */
950
951 for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
952 char transport[2048];
953
954 rtsp_st = rt->rtsp_streams[i];
955
956 /* RTP/UDP */
957 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
958 char buf[256];
959
960 /* first try in specified port range */
961 if (RTSP_RTP_PORT_MIN != 0) {
962 while(j <= RTSP_RTP_PORT_MAX) {
963 snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
964 j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
965 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
966 goto rtp_opened;
967 }
968 }
969 }
970
971 /* then try on any port
972 ** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
973 ** err = AVERROR_INVALIDDATA;
974 ** goto fail;
975 ** }
976 */
977
978 rtp_opened:
979 port = rtp_get_local_port(rtsp_st->rtp_handle);
980 snprintf(transport, sizeof(transport) - 1,
981 "%s/UDP;", trans_pref);
982 if (rt->server_type != RTSP_SERVER_REAL)
983 av_strlcat(transport, "unicast;", sizeof(transport));
984 av_strlcatf(transport, sizeof(transport),
985 "client_port=%d", port);
986 if (rt->transport == RTSP_TRANSPORT_RTP)
987 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
988 }
989
990 /* RTP/TCP */
991 else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
992 snprintf(transport, sizeof(transport) - 1,
993 "%s/TCP", trans_pref);
994 }
995
996 else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
997 snprintf(transport, sizeof(transport) - 1,
998 "%s/UDP;multicast", trans_pref);
999 }
1000 if (rt->server_type == RTSP_SERVER_REAL)
1001 av_strlcat(transport, ";mode=play", sizeof(transport));
1002 snprintf(cmd, sizeof(cmd),
1003 "SETUP %s RTSP/1.0\r\n"
1004 "Transport: %s\r\n",
1005 rtsp_st->control_url, transport);
1006 if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1007 char real_res[41], real_csum[9];
1008 ff_rdt_calc_response_and_checksum(real_res, real_csum,
1009 real_challenge);
1010 av_strlcatf(cmd, sizeof(cmd),
1011 "If-Match: %s\r\n"
1012 "RealChallenge2: %s, sd=%s\r\n",
1013 rt->session_id, real_res, real_csum);
1014 }
1015 rtsp_send_cmd(s, cmd, reply, NULL);
1016 if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1017 err = 1;
1018 goto fail;
1019 } else if (reply->status_code != RTSP_STATUS_OK ||
1020 reply->nb_transports != 1) {
1021 err = AVERROR_INVALIDDATA;
1022 goto fail;
1023 }
1024
1025 /* XXX: same protocol for all streams is required */
1026 if (i > 0) {
1027 if (reply->transports[0].lower_transport != rt->lower_transport ||
1028 reply->transports[0].transport != rt->transport) {
1029 err = AVERROR_INVALIDDATA;
1030 goto fail;
1031 }
1032 } else {
1033 rt->lower_transport = reply->transports[0].lower_transport;
1034 rt->transport = reply->transports[0].transport;
1035 }
1036
1037 /* close RTP connection if not choosen */
1038 if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1039 (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1040 url_close(rtsp_st->rtp_handle);
1041 rtsp_st->rtp_handle = NULL;
1042 }
1043
1044 switch(reply->transports[0].lower_transport) {
1045 case RTSP_LOWER_TRANSPORT_TCP:
1046 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1047 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1048 break;
1049
1050 case RTSP_LOWER_TRANSPORT_UDP:
1051 {
1052 char url[1024];
1053
1054 /* XXX: also use address if specified */
1055 snprintf(url, sizeof(url), "rtp://%s:%d",
1056 host, reply->transports[0].server_port_min);
1057 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1058 err = AVERROR_INVALIDDATA;
1059 goto fail;
1060 }
1061 }
1062 break;
1063 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1064 {
1065 char url[1024];
1066 struct in_addr in;
1067
1068 in.s_addr = htonl(reply->transports[0].destination);
1069 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1070 inet_ntoa(in),
1071 reply->transports[0].port_min,
1072 reply->transports[0].ttl);
1073 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1074 err = AVERROR_INVALIDDATA;
1075 goto fail;
1076 }
1077 }
1078 break;
1079 }
1080
1081 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1082 goto fail;
1083 }
1084
1085 if (rt->server_type == RTSP_SERVER_REAL)
1086 rt->need_subscription = 1;
1087
1088 return 0;
1089
1090 fail:
1091 for (i=0; i<rt->nb_rtsp_streams; i++) {
1092 if (rt->rtsp_streams[i]->rtp_handle) {
1093 url_close(rt->rtsp_streams[i]->rtp_handle);
1094 rt->rtsp_streams[i]->rtp_handle = NULL;
1095 }
1096 }
1097 return err;
1098 }
1099
1100 static int rtsp_read_header(AVFormatContext *s,
1101 AVFormatParameters *ap)
1102 {
1103 RTSPState *rt = s->priv_data;
1104 char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1105 URLContext *rtsp_hd;
1106 int port, ret, err;
1107 RTSPHeader reply1, *reply = &reply1;
1108 unsigned char *content = NULL;
1109 int lower_transport_mask = 0;
1110 char real_challenge[64];
1111
1112 /* extract hostname and port */
1113 url_split(NULL, 0, NULL, 0,
1114 host, sizeof(host), &port, path, sizeof(path), s->filename);
1115 if (port < 0)
1116 port = RTSP_DEFAULT_PORT;
1117
1118 /* search for options */
1119 option_list = strchr(path, '?');
1120 if (option_list) {
1121 /* remove the options from the path */
1122 *option_list++ = 0;
1123 while(option_list) {
1124 /* move the option pointer */
1125 option = option_list;
1126 option_list = strchr(option_list, '&');
1127 if (option_list)
1128 *(option_list++) = 0;
1129 /* handle the options */
1130 if (strcmp(option, "udp") == 0)
1131 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1132 else if (strcmp(option, "multicast") == 0)
1133 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1134 else if (strcmp(option, "tcp") == 0)
1135 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1136 }
1137 }
1138
1139 if (!lower_transport_mask)
1140 lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_LAST) - 1;
1141
1142 /* open the tcp connexion */
1143 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1144 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1145 return AVERROR(EIO);
1146 rt->rtsp_hd = rtsp_hd;
1147 rt->seq = 0;
1148
1149 /* request options supported by the server; this also detects server type */
1150 for (rt->server_type = RTSP_SERVER_RTP;;) {
1151 snprintf(cmd, sizeof(cmd),
1152 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1153 if (rt->server_type == RTSP_SERVER_REAL)
1154 av_strlcat(cmd,
1155 /**
1156 * The following entries are required for proper
1157 * streaming from a Realmedia server. They are
1158 * interdependent in some way although we currently
1159 * don't quite understand how. Values were copied
1160 * from mplayer SVN r23589.
1161 * @param CompanyID is a 16-byte ID in base64
1162 * @param ClientChallenge is a 16-byte ID in hex
1163 */
1164 "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1165 "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1166 "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1167 "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1168 sizeof(cmd));
1169 rtsp_send_cmd(s, cmd, reply, NULL);
1170 if (reply->status_code != RTSP_STATUS_OK) {
1171 err = AVERROR_INVALIDDATA;
1172 goto fail;
1173 }
1174
1175 /* detect server type if not standard-compliant RTP */
1176 if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1177 rt->server_type = RTSP_SERVER_REAL;
1178 continue;
1179 } else if (rt->server_type == RTSP_SERVER_REAL) {
1180 strcpy(real_challenge, reply->real_challenge);
1181 }
1182 break;
1183 }
1184
1185 /* describe the stream */
1186 snprintf(cmd, sizeof(cmd),
1187 "DESCRIBE %s RTSP/1.0\r\n"
1188 "Accept: application/sdp\r\n",
1189 s->filename);
1190 if (rt->server_type == RTSP_SERVER_REAL) {
1191 /**
1192 * The Require: attribute is needed for proper streaming from
1193 * Realmedia servers.
1194 */
1195 av_strlcat(cmd,
1196 "Require: com.real.retain-entity-for-setup\r\n",
1197 sizeof(cmd));
1198 }
1199 rtsp_send_cmd(s, cmd, reply, &content);
1200 if (!content) {
1201 err = AVERROR_INVALIDDATA;
1202 goto fail;
1203 }
1204 if (reply->status_code != RTSP_STATUS_OK) {
1205 err = AVERROR_INVALIDDATA;
1206 goto fail;
1207 }
1208
1209 /* now we got the SDP description, we parse it */
1210 ret = sdp_parse(s, (const char *)content);
1211 av_freep(&content);
1212 if (ret < 0) {
1213 err = AVERROR_INVALIDDATA;
1214 goto fail;
1215 }
1216
1217 do {
1218 int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1219
1220 err = make_setup_request(s, host, port, lower_transport,
1221 rt->server_type == RTSP_SERVER_REAL ?
1222 real_challenge : NULL);
1223 if (err < 0)
1224 goto fail;
1225 lower_transport_mask &= ~(1 << lower_transport);
1226 if (lower_transport_mask == 0 && err == 1) {
1227 err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1228 goto fail;
1229 }
1230 } while (err);
1231
1232 rt->state = RTSP_STATE_IDLE;
1233 rt->seek_timestamp = 0; /* default is to start stream at position
1234 zero */
1235 if (ap->initial_pause) {
1236 /* do not start immediately */
1237 } else {
1238 if (rtsp_read_play(s) < 0) {
1239 err = AVERROR_INVALIDDATA;
1240 goto fail;
1241 }
1242 }
1243 return 0;
1244 fail:
1245 rtsp_close_streams(rt);
1246 av_freep(&content);
1247 url_close(rt->rtsp_hd);
1248 return err;
1249 }
1250
1251 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1252 uint8_t *buf, int buf_size)
1253 {
1254 RTSPState *rt = s->priv_data;
1255 int id, len, i, ret;
1256 RTSPStream *rtsp_st;
1257
1258 #ifdef DEBUG_RTP_TCP
1259 printf("tcp_read_packet:\n");
1260 #endif
1261 redo:
1262 for(;;) {
1263 ret = url_readbuf(rt->rtsp_hd, buf, 1);
1264 #ifdef DEBUG_RTP_TCP
1265 printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1266 #endif
1267 if (ret != 1)
1268 return -1;
1269 if (buf[0] == '$')
1270 break;
1271 }
1272 ret = url_readbuf(rt->rtsp_hd, buf, 3);
1273 if (ret != 3)
1274 return -1;
1275 id = buf[0];
1276 len = AV_RB16(buf + 1);
1277 #ifdef DEBUG_RTP_TCP
1278 printf("id=%d len=%d\n", id, len);
1279 #endif
1280 if (len > buf_size || len < 12)
1281 goto redo;
1282 /* get the data */
1283 ret = url_readbuf(rt->rtsp_hd, buf, len);
1284 if (ret != len)
1285 return -1;
1286 if (rt->transport == RTSP_TRANSPORT_RDT &&
1287 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1288 return -1;
1289
1290 /* find the matching stream */
1291 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1292 rtsp_st = rt->rtsp_streams[i];
1293 if (id >= rtsp_st->interleaved_min &&
1294 id <= rtsp_st->interleaved_max)
1295 goto found;
1296 }
1297 goto redo;
1298 found:
1299 *prtsp_st = rtsp_st;
1300 return len;
1301 }
1302
1303 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1304 uint8_t *buf, int buf_size)
1305 {
1306 RTSPState *rt = s->priv_data;
1307 RTSPStream *rtsp_st;
1308 fd_set rfds;
1309 int fd1, fd2, fd_max, n, i, ret;
1310 struct timeval tv;
1311
1312 for(;;) {
1313 if (url_interrupt_cb())
1314 return AVERROR(EINTR);
1315 FD_ZERO(&rfds);
1316 fd_max = -1;
1317 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1318 rtsp_st = rt->rtsp_streams[i];
1319 /* currently, we cannot probe RTCP handle because of blocking restrictions */
1320 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1321 if (fd1 > fd_max)
1322 fd_max = fd1;
1323 FD_SET(fd1, &rfds);
1324 }
1325 tv.tv_sec = 0;
1326 tv.tv_usec = 100 * 1000;
1327 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1328 if (n > 0) {
1329 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1330 rtsp_st = rt->rtsp_streams[i];
1331 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1332 if (FD_ISSET(fd1, &rfds)) {
1333 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1334 if (ret > 0) {
1335 *prtsp_st = rtsp_st;
1336 return ret;
1337 }
1338 }
1339 }
1340 }
1341 }
1342 }
1343
1344 static int rtsp_read_packet(AVFormatContext *s,
1345 AVPacket *pkt)
1346 {
1347 RTSPState *rt = s->priv_data;
1348 RTSPStream *rtsp_st;
1349 int ret, len;
1350 uint8_t buf[RTP_MAX_PACKET_LENGTH];
1351
1352 if (rt->server_type == RTSP_SERVER_REAL && rt->need_subscription) {
1353 int i;
1354 RTSPHeader reply1, *reply = &reply1;
1355 char cmd[1024];
1356
1357 snprintf(cmd, sizeof(cmd),
1358 "SET_PARAMETER %s RTSP/1.0\r\n"
1359 "Subscribe: ",
1360 s->filename);
1361 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1362 if (i != 0) av_strlcat(cmd, ",", sizeof(cmd));
1363 ff_rdt_subscribe_rule(cmd, sizeof(cmd), i, 0);
1364 if (rt->transport == RTSP_TRANSPORT_RDT)
1365 ff_rdt_subscribe_rule2(
1366 rt->rtsp_streams[i]->tx_ctx,
1367 cmd, sizeof(cmd), i, 0);
1368 }
1369 av_strlcat(cmd, "\r\n", sizeof(cmd));
1370 rtsp_send_cmd(s, cmd, reply, NULL);
1371 if (reply->status_code != RTSP_STATUS_OK)
1372 return AVERROR_INVALIDDATA;
1373 rt->need_subscription = 0;
1374
1375 if (rt->state == RTSP_STATE_PLAYING)
1376 rtsp_read_play (s);
1377 }
1378
1379 /* get next frames from the same RTP packet */
1380 if (rt->cur_tx) {
1381 if (rt->transport == RTSP_TRANSPORT_RDT)
1382 ret = ff_rdt_parse_packet(rt->cur_tx, pkt, NULL, 0);
1383 else
1384 ret = rtp_parse_packet(rt->cur_tx, pkt, NULL, 0);
1385 if (ret == 0) {
1386 rt->cur_tx = NULL;
1387 return 0;
1388 } else if (ret == 1) {
1389 return 0;
1390 } else {
1391 rt->cur_tx = NULL;
1392 }
1393 }
1394
1395 /* read next RTP packet */
1396 redo:
1397 switch(rt->lower_transport) {
1398 default:
1399 case RTSP_LOWER_TRANSPORT_TCP:
1400 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1401 break;
1402 case RTSP_LOWER_TRANSPORT_UDP:
1403 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1404 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1405 if (len >=0 && rtsp_st->tx_ctx && rt->transport == RTSP_TRANSPORT_RTP)
1406 rtp_check_and_send_back_rr(rtsp_st->tx_ctx, len);
1407 break;
1408 }
1409 if (len < 0)
1410 return len;
1411 if (rt->transport == RTSP_TRANSPORT_RDT)
1412 ret = ff_rdt_parse_packet(rtsp_st->tx_ctx, pkt, buf, len);
1413 else
1414 ret = rtp_parse_packet(rtsp_st->tx_ctx, pkt, buf, len);
1415 if (ret < 0)
1416 goto redo;
1417 if (ret == 1) {
1418 /* more packets may follow, so we save the RTP context */
1419 rt->cur_tx = rtsp_st->tx_ctx;
1420 }
1421 return 0;
1422 }
1423
1424 static int rtsp_read_play(AVFormatContext *s)
1425 {
1426 RTSPState *rt = s->priv_data;
1427 RTSPHeader reply1, *reply = &reply1;
1428 char cmd[1024];
1429
1430 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1431
1432 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1433 if (rt->state == RTSP_STATE_PAUSED) {
1434 snprintf(cmd, sizeof(cmd),
1435 "PLAY %s RTSP/1.0\r\n",
1436 s->filename);
1437 } else {
1438 snprintf(cmd, sizeof(cmd),
1439 "PLAY %s RTSP/1.0\r\n"
1440 "Range: npt=%0.3f-\r\n",
1441 s->filename,
1442 (double)rt->seek_timestamp / AV_TIME_BASE);
1443 }
1444 rtsp_send_cmd(s, cmd, reply, NULL);
1445 if (reply->status_code != RTSP_STATUS_OK) {
1446 return -1;
1447 }
1448 }
1449 rt->state = RTSP_STATE_PLAYING;
1450 return 0;
1451 }
1452
1453 /* pause the stream */
1454 static int rtsp_read_pause(AVFormatContext *s)
1455 {
1456 RTSPState *rt = s->priv_data;
1457 RTSPHeader reply1, *reply = &reply1;
1458 char cmd[1024];
1459
1460 rt = s->priv_data;
1461
1462 if (rt->state != RTSP_STATE_PLAYING)
1463 return 0;
1464 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1465 snprintf(cmd, sizeof(cmd),
1466 "PAUSE %s RTSP/1.0\r\n",
1467 s->filename);
1468 rtsp_send_cmd(s, cmd, reply, NULL);
1469 if (reply->status_code != RTSP_STATUS_OK) {
1470 return -1;
1471 }
1472 }
1473 rt->state = RTSP_STATE_PAUSED;
1474 return 0;
1475 }
1476
1477 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1478 int64_t timestamp, int flags)
1479 {
1480 RTSPState *rt = s->priv_data;
1481
1482 rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1483 switch(rt->state) {
1484 default:
1485 case RTSP_STATE_IDLE:
1486 break;
1487 case RTSP_STATE_PLAYING:
1488 if (rtsp_read_play(s) != 0)
1489 return -1;
1490 break;
1491 case RTSP_STATE_PAUSED:
1492 rt->state = RTSP_STATE_IDLE;
1493 break;
1494 }
1495 return 0;
1496 }
1497
1498 static int rtsp_read_close(AVFormatContext *s)
1499 {
1500 RTSPState *rt = s->priv_data;
1501 RTSPHeader reply1, *reply = &reply1;
1502 char cmd[1024];
1503
1504 #if 0
1505 /* NOTE: it is valid to flush the buffer here */
1506 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1507 url_fclose(&rt->rtsp_gb);
1508 }
1509 #endif
1510 snprintf(cmd, sizeof(cmd),
1511 "TEARDOWN %s RTSP/1.0\r\n",
1512 s->filename);
1513 rtsp_send_cmd(s, cmd, reply, NULL);
1514
1515 rtsp_close_streams(rt);
1516 url_close(rt->rtsp_hd);
1517 return 0;
1518 }
1519
1520 #ifdef CONFIG_RTSP_DEMUXER
1521 AVInputFormat rtsp_demuxer = {
1522 "rtsp",
1523 NULL_IF_CONFIG_SMALL("RTSP input format"),
1524 sizeof(RTSPState),
1525 rtsp_probe,
1526 rtsp_read_header,
1527 rtsp_read_packet,
1528 rtsp_read_close,
1529 rtsp_read_seek,
1530 .flags = AVFMT_NOFILE,
1531 .read_play = rtsp_read_play,
1532 .read_pause = rtsp_read_pause,
1533 };
1534 #endif
1535
1536 static int sdp_probe(AVProbeData *p1)
1537 {
1538 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1539
1540 /* we look for a line beginning "c=IN IP4" */
1541 while (p < p_end && *p != '\0') {
1542 if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1543 return AVPROBE_SCORE_MAX / 2;
1544
1545 while(p < p_end - 1 && *p != '\n') p++;
1546 if (++p >= p_end)
1547 break;
1548 if (*p == '\r')
1549 p++;
1550 }
1551 return 0;
1552 }
1553
1554 #define SDP_MAX_SIZE 8192
1555
1556 static int sdp_read_header(AVFormatContext *s,
1557 AVFormatParameters *ap)
1558 {
1559 RTSPState *rt = s->priv_data;
1560 RTSPStream *rtsp_st;
1561 int size, i, err;
1562 char *content;
1563 char url[1024];
1564
1565 /* read the whole sdp file */
1566 /* XXX: better loading */
1567 content = av_malloc(SDP_MAX_SIZE);
1568 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1569 if (size <= 0) {
1570 av_free(content);
1571 return AVERROR_INVALIDDATA;
1572 }
1573 content[size] ='\0';
1574
1575 sdp_parse(s, content);
1576 av_free(content);
1577
1578 /* open each RTP stream */
1579 for(i=0;i<rt->nb_rtsp_streams;i++) {
1580 rtsp_st = rt->rtsp_streams[i];
1581
1582 snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1583 inet_ntoa(rtsp_st->sdp_ip),
1584 rtsp_st->sdp_port,
1585 rtsp_st->sdp_port,
1586 rtsp_st->sdp_ttl);
1587 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1588 err = AVERROR_INVALIDDATA;
1589 goto fail;
1590 }
1591 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1592 goto fail;
1593 }
1594 return 0;
1595 fail:
1596 rtsp_close_streams(rt);
1597 return err;
1598 }
1599
1600 static int sdp_read_packet(AVFormatContext *s,
1601 AVPacket *pkt)
1602 {
1603 return rtsp_read_packet(s, pkt);
1604 }
1605
1606 static int sdp_read_close(AVFormatContext *s)
1607 {
1608 RTSPState *rt = s->priv_data;
1609 rtsp_close_streams(rt);
1610 return 0;
1611 }
1612
1613 #ifdef CONFIG_SDP_DEMUXER
1614 AVInputFormat sdp_demuxer = {
1615 "sdp",
1616 NULL_IF_CONFIG_SMALL("SDP"),
1617 sizeof(RTSPState),
1618 sdp_probe,
1619 sdp_read_header,
1620 sdp_read_packet,
1621 sdp_read_close,
1622 };
1623 #endif
1624
1625 #ifdef CONFIG_REDIR_DEMUXER
1626 /* dummy redirector format (used directly in av_open_input_file now) */
1627 static int redir_probe(AVProbeData *pd)
1628 {
1629 const char *p;
1630 p = pd->buf;
1631 while (redir_isspace(*p))
1632 p++;
1633 if (av_strstart(p, "http://", NULL) ||
1634 av_strstart(p, "rtsp://", NULL))
1635 return AVPROBE_SCORE_MAX;
1636 return 0;
1637 }
1638
1639 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1640 {
1641 char buf[4096], *q;
1642 int c;
1643 AVFormatContext *ic = NULL;
1644 ByteIOContext *f = s->pb;
1645
1646 /* parse each URL and try to open it */
1647 c = url_fgetc(f);
1648 while (c != URL_EOF) {
1649 /* skip spaces */
1650 for(;;) {
1651 if (!redir_isspace(c))
1652 break;
1653 c = url_fgetc(f);
1654 }
1655 if (c == URL_EOF)
1656 break;
1657 /* record url */
1658 q = buf;
1659 for(;;) {
1660 if (c == URL_EOF || redir_isspace(c))
1661 break;
1662 if ((q - buf) < sizeof(buf) - 1)
1663 *q++ = c;
1664 c = url_fgetc(f);
1665 }
1666 *q = '\0';
1667 //printf("URL='%s'\n", buf);
1668 /* try to open the media file */
1669 if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1670 break;
1671 }
1672 if (!ic)
1673 return AVERROR(EIO);
1674
1675 *s = *ic;
1676 url_fclose(f);
1677
1678 return 0;
1679 }
1680
1681 AVInputFormat redir_demuxer = {
1682 "redir",
1683 NULL_IF_CONFIG_SMALL("Redirector format"),
1684 0,
1685 redir_probe,
1686 redir_read_header,
1687 NULL,
1688 NULL,
1689 };
1690 #endif