Reindent after r17777.
[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 "libavutil/intreadwrite.h"
27 #include "avformat.h"
28
29 #include <sys/time.h>
30 #if HAVE_SYS_SELECT_H
31 #include <sys/select.h>
32 #endif
33 #include <strings.h>
34 #include "network.h"
35 #include "rtsp.h"
36
37 #include "rtpdec.h"
38 #include "rdt.h"
39
40 //#define DEBUG
41 //#define DEBUG_RTP_TCP
42
43 static int rtsp_read_play(AVFormatContext *s);
44
45 /* XXX: currently, the only way to change the protocols consists in
46 changing this variable */
47
48 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
49 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
50 #endif
51
52 static int rtsp_probe(AVProbeData *p)
53 {
54 if (av_strstart(p->filename, "rtsp:", NULL))
55 return AVPROBE_SCORE_MAX;
56 return 0;
57 }
58
59 static int redir_isspace(int c)
60 {
61 return c == ' ' || c == '\t' || c == '\n' || c == '\r';
62 }
63
64 static void skip_spaces(const char **pp)
65 {
66 const char *p;
67 p = *pp;
68 while (redir_isspace(*p))
69 p++;
70 *pp = p;
71 }
72
73 static void get_word_sep(char *buf, int buf_size, const char *sep,
74 const char **pp)
75 {
76 const char *p;
77 char *q;
78
79 p = *pp;
80 if (*p == '/')
81 p++;
82 skip_spaces(&p);
83 q = buf;
84 while (!strchr(sep, *p) && *p != '\0') {
85 if ((q - buf) < buf_size - 1)
86 *q++ = *p;
87 p++;
88 }
89 if (buf_size > 0)
90 *q = '\0';
91 *pp = p;
92 }
93
94 static void get_word(char *buf, int buf_size, const char **pp)
95 {
96 const char *p;
97 char *q;
98
99 p = *pp;
100 skip_spaces(&p);
101 q = buf;
102 while (!redir_isspace(*p) && *p != '\0') {
103 if ((q - buf) < buf_size - 1)
104 *q++ = *p;
105 p++;
106 }
107 if (buf_size > 0)
108 *q = '\0';
109 *pp = p;
110 }
111
112 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
113 params>] */
114 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
115 {
116 char buf[256];
117 int i;
118 AVCodec *c;
119 const char *c_name;
120
121 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
122 see if we can handle this kind of payload */
123 get_word_sep(buf, sizeof(buf), "/", &p);
124 if (payload_type >= RTP_PT_PRIVATE) {
125 RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
126 while(handler) {
127 if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
128 codec->codec_id = handler->codec_id;
129 rtsp_st->dynamic_handler= handler;
130 if(handler->open) {
131 rtsp_st->dynamic_protocol_context= handler->open();
132 }
133 break;
134 }
135 handler= handler->next;
136 }
137 } else {
138 /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
139 /* search into AVRtpPayloadTypes[] */
140 codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
141 }
142
143 c = avcodec_find_decoder(codec->codec_id);
144 if (c && c->name)
145 c_name = c->name;
146 else
147 c_name = (char *)NULL;
148
149 if (c_name) {
150 get_word_sep(buf, sizeof(buf), "/", &p);
151 i = atoi(buf);
152 switch (codec->codec_type) {
153 case CODEC_TYPE_AUDIO:
154 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
155 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
156 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
157 if (i > 0) {
158 codec->sample_rate = i;
159 get_word_sep(buf, sizeof(buf), "/", &p);
160 i = atoi(buf);
161 if (i > 0)
162 codec->channels = i;
163 // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
164 // frequency. No problem, but the sample rate is being set here by the sdp line. Upcoming patch forthcoming. (rdm)
165 }
166 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
167 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
168 break;
169 case CODEC_TYPE_VIDEO:
170 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
171 break;
172 default:
173 break;
174 }
175 return 0;
176 }
177
178 return -1;
179 }
180
181 /* return the length and optionnaly the data */
182 static int hex_to_data(uint8_t *data, const char *p)
183 {
184 int c, len, v;
185
186 len = 0;
187 v = 1;
188 for(;;) {
189 skip_spaces(&p);
190 if (p == '\0')
191 break;
192 c = toupper((unsigned char)*p++);
193 if (c >= '0' && c <= '9')
194 c = c - '0';
195 else if (c >= 'A' && c <= 'F')
196 c = c - 'A' + 10;
197 else
198 break;
199 v = (v << 4) | c;
200 if (v & 0x100) {
201 if (data)
202 data[len] = v;
203 len++;
204 v = 1;
205 }
206 }
207 return len;
208 }
209
210 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
211 {
212 switch (codec->codec_id) {
213 case CODEC_ID_MPEG4:
214 case CODEC_ID_AAC:
215 if (!strcmp(attr, "config")) {
216 /* decode the hexa encoded parameter */
217 int len = hex_to_data(NULL, value);
218 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
219 if (!codec->extradata)
220 return;
221 codec->extradata_size = len;
222 hex_to_data(codec->extradata, value);
223 }
224 break;
225 default:
226 break;
227 }
228 return;
229 }
230
231 typedef struct {
232 const char *str;
233 uint16_t type;
234 uint32_t offset;
235 } AttrNameMap;
236
237 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
238 #define ATTR_NAME_TYPE_INT 0
239 #define ATTR_NAME_TYPE_STR 1
240 static const AttrNameMap attr_names[]=
241 {
242 {"SizeLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, sizelength)},
243 {"IndexLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexlength)},
244 {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexdeltalength)},
245 {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, profile_level_id)},
246 {"StreamType", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, streamtype)},
247 {"mode", ATTR_NAME_TYPE_STR, offsetof(RTPPayloadData, mode)},
248 {NULL, -1, -1},
249 };
250
251 /** parse the attribute line from the fmtp a line of an sdp resonse. This is broken out as a function
252 * because it is used in rtp_h264.c, which is forthcoming.
253 */
254 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
255 {
256 skip_spaces(p);
257 if(**p)
258 {
259 get_word_sep(attr, attr_size, "=", p);
260 if (**p == '=')
261 (*p)++;
262 get_word_sep(value, value_size, ";", p);
263 if (**p == ';')
264 (*p)++;
265 return 1;
266 }
267 return 0;
268 }
269
270 /* parse a SDP line and save stream attributes */
271 static void sdp_parse_fmtp(AVStream *st, const char *p)
272 {
273 char attr[256];
274 char value[4096];
275 int i;
276
277 RTSPStream *rtsp_st = st->priv_data;
278 AVCodecContext *codec = st->codec;
279 RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
280
281 /* loop on each attribute */
282 while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
283 {
284 /* grab the codec extra_data from the config parameter of the fmtp line */
285 sdp_parse_fmtp_config(codec, attr, value);
286 /* Looking for a known attribute */
287 for (i = 0; attr_names[i].str; ++i) {
288 if (!strcasecmp(attr, attr_names[i].str)) {
289 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
290 *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
291 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
292 *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
293 }
294 }
295 }
296 }
297
298 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
299 * and end time.
300 * Used for seeking in the rtp stream.
301 */
302 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
303 {
304 char buf[256];
305
306 skip_spaces(&p);
307 if (!av_stristart(p, "npt=", &p))
308 return;
309
310 *start = AV_NOPTS_VALUE;
311 *end = AV_NOPTS_VALUE;
312
313 get_word_sep(buf, sizeof(buf), "-", &p);
314 *start = parse_date(buf, 1);
315 if (*p == '-') {
316 p++;
317 get_word_sep(buf, sizeof(buf), "-", &p);
318 *end = parse_date(buf, 1);
319 }
320 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
321 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
322 }
323
324 typedef struct SDPParseState {
325 /* SDP only */
326 struct in_addr default_ip;
327 int default_ttl;
328 int skip_media; ///< set if an unknown m= line occurs
329 } SDPParseState;
330
331 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
332 int letter, const char *buf)
333 {
334 RTSPState *rt = s->priv_data;
335 char buf1[64], st_type[64];
336 const char *p;
337 enum CodecType codec_type;
338 int payload_type, i;
339 AVStream *st;
340 RTSPStream *rtsp_st;
341 struct in_addr sdp_ip;
342 int ttl;
343
344 #ifdef DEBUG
345 printf("sdp: %c='%s'\n", letter, buf);
346 #endif
347
348 p = buf;
349 if (s1->skip_media && letter != 'm')
350 return;
351 switch(letter) {
352 case 'c':
353 get_word(buf1, sizeof(buf1), &p);
354 if (strcmp(buf1, "IN") != 0)
355 return;
356 get_word(buf1, sizeof(buf1), &p);
357 if (strcmp(buf1, "IP4") != 0)
358 return;
359 get_word_sep(buf1, sizeof(buf1), "/", &p);
360 if (inet_aton(buf1, &sdp_ip) == 0)
361 return;
362 ttl = 16;
363 if (*p == '/') {
364 p++;
365 get_word_sep(buf1, sizeof(buf1), "/", &p);
366 ttl = atoi(buf1);
367 }
368 if (s->nb_streams == 0) {
369 s1->default_ip = sdp_ip;
370 s1->default_ttl = ttl;
371 } else {
372 st = s->streams[s->nb_streams - 1];
373 rtsp_st = st->priv_data;
374 rtsp_st->sdp_ip = sdp_ip;
375 rtsp_st->sdp_ttl = ttl;
376 }
377 break;
378 case 's':
379 av_metadata_set(&s->metadata, "title", p);
380 break;
381 case 'i':
382 if (s->nb_streams == 0) {
383 av_metadata_set(&s->metadata, "comment", p);
384 break;
385 }
386 break;
387 case 'm':
388 /* new stream */
389 s1->skip_media = 0;
390 get_word(st_type, sizeof(st_type), &p);
391 if (!strcmp(st_type, "audio")) {
392 codec_type = CODEC_TYPE_AUDIO;
393 } else if (!strcmp(st_type, "video")) {
394 codec_type = CODEC_TYPE_VIDEO;
395 } else if (!strcmp(st_type, "application")) {
396 codec_type = CODEC_TYPE_DATA;
397 } else {
398 s1->skip_media = 1;
399 return;
400 }
401 rtsp_st = av_mallocz(sizeof(RTSPStream));
402 if (!rtsp_st)
403 return;
404 rtsp_st->stream_index = -1;
405 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
406
407 rtsp_st->sdp_ip = s1->default_ip;
408 rtsp_st->sdp_ttl = s1->default_ttl;
409
410 get_word(buf1, sizeof(buf1), &p); /* port */
411 rtsp_st->sdp_port = atoi(buf1);
412
413 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
414
415 /* XXX: handle list of formats */
416 get_word(buf1, sizeof(buf1), &p); /* format list */
417 rtsp_st->sdp_payload_type = atoi(buf1);
418
419 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
420 /* no corresponding stream */
421 } else {
422 st = av_new_stream(s, 0);
423 if (!st)
424 return;
425 st->priv_data = rtsp_st;
426 rtsp_st->stream_index = st->index;
427 st->codec->codec_type = codec_type;
428 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
429 /* if standard payload type, we can find the codec right now */
430 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
431 }
432 }
433 /* put a default control url */
434 av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
435 break;
436 case 'a':
437 if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
438 char proto[32];
439 /* get the control url */
440 st = s->streams[s->nb_streams - 1];
441 rtsp_st = st->priv_data;
442
443 /* XXX: may need to add full url resolution */
444 url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
445 if (proto[0] == '\0') {
446 /* relative control URL */
447 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
448 av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
449 } else {
450 av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
451 }
452 } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
453 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
454 get_word(buf1, sizeof(buf1), &p);
455 payload_type = atoi(buf1);
456 st = s->streams[s->nb_streams - 1];
457 rtsp_st = st->priv_data;
458 sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
459 } else if (av_strstart(p, "fmtp:", &p)) {
460 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
461 get_word(buf1, sizeof(buf1), &p);
462 payload_type = atoi(buf1);
463 for(i = 0; i < s->nb_streams;i++) {
464 st = s->streams[i];
465 rtsp_st = st->priv_data;
466 if (rtsp_st->sdp_payload_type == payload_type) {
467 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
468 if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
469 sdp_parse_fmtp(st, p);
470 }
471 } else {
472 sdp_parse_fmtp(st, p);
473 }
474 }
475 }
476 } else if(av_strstart(p, "framesize:", &p)) {
477 // let dynamic protocol handlers have a stab at the line.
478 get_word(buf1, sizeof(buf1), &p);
479 payload_type = atoi(buf1);
480 for(i = 0; i < s->nb_streams;i++) {
481 st = s->streams[i];
482 rtsp_st = st->priv_data;
483 if (rtsp_st->sdp_payload_type == payload_type) {
484 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
485 rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
486 }
487 }
488 }
489 } else if(av_strstart(p, "range:", &p)) {
490 int64_t start, end;
491
492 // this is so that seeking on a streamed file can work.
493 rtsp_parse_range_npt(p, &start, &end);
494 s->start_time= start;
495 s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
496 } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
497 if (atoi(p) == 1)
498 rt->transport = RTSP_TRANSPORT_RDT;
499 } else if (s->nb_streams > 0) {
500 if (rt->server_type == RTSP_SERVER_REAL)
501 ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
502
503 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
504 if (rtsp_st->dynamic_handler &&
505 rtsp_st->dynamic_handler->parse_sdp_a_line)
506 rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
507 rtsp_st->dynamic_protocol_context, buf);
508 }
509 break;
510 }
511 }
512
513 static int sdp_parse(AVFormatContext *s, const char *content)
514 {
515 const char *p;
516 int letter;
517 /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
518 * contain long SDP lines containing complete ASF Headers (several
519 * kB) or arrays of MDPR (RM stream descriptor) headers plus
520 * "rulebooks" describing their properties. Therefore, the SDP line
521 * buffer is large. */
522 char buf[8192], *q;
523 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
524
525 memset(s1, 0, sizeof(SDPParseState));
526 p = content;
527 for(;;) {
528 skip_spaces(&p);
529 letter = *p;
530 if (letter == '\0')
531 break;
532 p++;
533 if (*p != '=')
534 goto next_line;
535 p++;
536 /* get the content */
537 q = buf;
538 while (*p != '\n' && *p != '\r' && *p != '\0') {
539 if ((q - buf) < sizeof(buf) - 1)
540 *q++ = *p;
541 p++;
542 }
543 *q = '\0';
544 sdp_parse_line(s, s1, letter, buf);
545 next_line:
546 while (*p != '\n' && *p != '\0')
547 p++;
548 if (*p == '\n')
549 p++;
550 }
551 return 0;
552 }
553
554 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
555 {
556 const char *p;
557 int v;
558
559 p = *pp;
560 skip_spaces(&p);
561 v = strtol(p, (char **)&p, 10);
562 if (*p == '-') {
563 p++;
564 *min_ptr = v;
565 v = strtol(p, (char **)&p, 10);
566 *max_ptr = v;
567 } else {
568 *min_ptr = v;
569 *max_ptr = v;
570 }
571 *pp = p;
572 }
573
574 /* XXX: only one transport specification is parsed */
575 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
576 {
577 char transport_protocol[16];
578 char profile[16];
579 char lower_transport[16];
580 char parameter[16];
581 RTSPTransportField *th;
582 char buf[256];
583
584 reply->nb_transports = 0;
585
586 for(;;) {
587 skip_spaces(&p);
588 if (*p == '\0')
589 break;
590
591 th = &reply->transports[reply->nb_transports];
592
593 get_word_sep(transport_protocol, sizeof(transport_protocol),
594 "/", &p);
595 if (*p == '/')
596 p++;
597 if (!strcasecmp (transport_protocol, "rtp")) {
598 get_word_sep(profile, sizeof(profile), "/;,", &p);
599 lower_transport[0] = '\0';
600 /* rtp/avp/<protocol> */
601 if (*p == '/') {
602 p++;
603 get_word_sep(lower_transport, sizeof(lower_transport),
604 ";,", &p);
605 }
606 th->transport = RTSP_TRANSPORT_RTP;
607 } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
608 !strcasecmp (transport_protocol, "x-real-rdt")) {
609 /* x-pn-tng/<protocol> */
610 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
611 profile[0] = '\0';
612 th->transport = RTSP_TRANSPORT_RDT;
613 }
614 if (!strcasecmp(lower_transport, "TCP"))
615 th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
616 else
617 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
618
619 if (*p == ';')
620 p++;
621 /* get each parameter */
622 while (*p != '\0' && *p != ',') {
623 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
624 if (!strcmp(parameter, "port")) {
625 if (*p == '=') {
626 p++;
627 rtsp_parse_range(&th->port_min, &th->port_max, &p);
628 }
629 } else if (!strcmp(parameter, "client_port")) {
630 if (*p == '=') {
631 p++;
632 rtsp_parse_range(&th->client_port_min,
633 &th->client_port_max, &p);
634 }
635 } else if (!strcmp(parameter, "server_port")) {
636 if (*p == '=') {
637 p++;
638 rtsp_parse_range(&th->server_port_min,
639 &th->server_port_max, &p);
640 }
641 } else if (!strcmp(parameter, "interleaved")) {
642 if (*p == '=') {
643 p++;
644 rtsp_parse_range(&th->interleaved_min,
645 &th->interleaved_max, &p);
646 }
647 } else if (!strcmp(parameter, "multicast")) {
648 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
649 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
650 } else if (!strcmp(parameter, "ttl")) {
651 if (*p == '=') {
652 p++;
653 th->ttl = strtol(p, (char **)&p, 10);
654 }
655 } else if (!strcmp(parameter, "destination")) {
656 struct in_addr ipaddr;
657
658 if (*p == '=') {
659 p++;
660 get_word_sep(buf, sizeof(buf), ";,", &p);
661 if (inet_aton(buf, &ipaddr))
662 th->destination = ntohl(ipaddr.s_addr);
663 }
664 }
665 while (*p != ';' && *p != '\0' && *p != ',')
666 p++;
667 if (*p == ';')
668 p++;
669 }
670 if (*p == ',')
671 p++;
672
673 reply->nb_transports++;
674 }
675 }
676
677 void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
678 {
679 const char *p;
680
681 /* NOTE: we do case independent match for broken servers */
682 p = buf;
683 if (av_stristart(p, "Session:", &p)) {
684 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
685 } else if (av_stristart(p, "Content-Length:", &p)) {
686 reply->content_length = strtol(p, NULL, 10);
687 } else if (av_stristart(p, "Transport:", &p)) {
688 rtsp_parse_transport(reply, p);
689 } else if (av_stristart(p, "CSeq:", &p)) {
690 reply->seq = strtol(p, NULL, 10);
691 } else if (av_stristart(p, "Range:", &p)) {
692 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
693 } else if (av_stristart(p, "RealChallenge1:", &p)) {
694 skip_spaces(&p);
695 av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
696 } else if (av_stristart(p, "Server:", &p)) {
697 skip_spaces(&p);
698 av_strlcpy(reply->server, p, sizeof(reply->server));
699 }
700 }
701
702 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
703 {
704 int ret, len;
705
706 len = 0;
707 while (len < size) {
708 ret = url_read(h, buf+len, size-len);
709 if (ret < 1)
710 return ret;
711 len += ret;
712 }
713 return len;
714 }
715
716 /* skip a RTP/TCP interleaved packet */
717 static void rtsp_skip_packet(AVFormatContext *s)
718 {
719 RTSPState *rt = s->priv_data;
720 int ret, len, len1;
721 uint8_t buf[1024];
722
723 ret = url_readbuf(rt->rtsp_hd, buf, 3);
724 if (ret != 3)
725 return;
726 len = AV_RB16(buf + 1);
727 #ifdef DEBUG
728 printf("skipping RTP packet len=%d\n", len);
729 #endif
730 /* skip payload */
731 while (len > 0) {
732 len1 = len;
733 if (len1 > sizeof(buf))
734 len1 = sizeof(buf);
735 ret = url_readbuf(rt->rtsp_hd, buf, len1);
736 if (ret != len1)
737 return;
738 len -= len1;
739 }
740 }
741
742 static void rtsp_send_cmd(AVFormatContext *s,
743 const char *cmd, RTSPMessageHeader *reply,
744 unsigned char **content_ptr)
745 {
746 RTSPState *rt = s->priv_data;
747 char buf[4096], buf1[1024], *q;
748 unsigned char ch;
749 const char *p;
750 int content_length, line_count;
751 unsigned char *content = NULL;
752
753 memset(reply, 0, sizeof(*reply));
754
755 rt->seq++;
756 av_strlcpy(buf, cmd, sizeof(buf));
757 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
758 av_strlcat(buf, buf1, sizeof(buf));
759 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
760 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
761 av_strlcat(buf, buf1, sizeof(buf));
762 }
763 av_strlcat(buf, "\r\n", sizeof(buf));
764 #ifdef DEBUG
765 printf("Sending:\n%s--\n", buf);
766 #endif
767 url_write(rt->rtsp_hd, buf, strlen(buf));
768
769 /* parse reply (XXX: use buffers) */
770 line_count = 0;
771 rt->last_reply[0] = '\0';
772 for(;;) {
773 q = buf;
774 for(;;) {
775 if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
776 break;
777 if (ch == '\n')
778 break;
779 if (ch == '$') {
780 /* XXX: only parse it if first char on line ? */
781 rtsp_skip_packet(s);
782 } else if (ch != '\r') {
783 if ((q - buf) < sizeof(buf) - 1)
784 *q++ = ch;
785 }
786 }
787 *q = '\0';
788 #ifdef DEBUG
789 printf("line='%s'\n", buf);
790 #endif
791 /* test if last line */
792 if (buf[0] == '\0')
793 break;
794 p = buf;
795 if (line_count == 0) {
796 /* get reply code */
797 get_word(buf1, sizeof(buf1), &p);
798 get_word(buf1, sizeof(buf1), &p);
799 reply->status_code = atoi(buf1);
800 } else {
801 rtsp_parse_line(reply, p);
802 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
803 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
804 }
805 line_count++;
806 }
807
808 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
809 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
810
811 content_length = reply->content_length;
812 if (content_length > 0) {
813 /* leave some room for a trailing '\0' (useful for simple parsing) */
814 content = av_malloc(content_length + 1);
815 (void)url_readbuf(rt->rtsp_hd, content, content_length);
816 content[content_length] = '\0';
817 }
818 if (content_ptr)
819 *content_ptr = content;
820 else
821 av_free(content);
822 }
823
824
825 /* close and free RTSP streams */
826 static void rtsp_close_streams(RTSPState *rt)
827 {
828 int i;
829 RTSPStream *rtsp_st;
830
831 for(i=0;i<rt->nb_rtsp_streams;i++) {
832 rtsp_st = rt->rtsp_streams[i];
833 if (rtsp_st) {
834 if (rtsp_st->transport_priv) {
835 if (rt->transport == RTSP_TRANSPORT_RDT)
836 ff_rdt_parse_close(rtsp_st->transport_priv);
837 else
838 rtp_parse_close(rtsp_st->transport_priv);
839 }
840 if (rtsp_st->rtp_handle)
841 url_close(rtsp_st->rtp_handle);
842 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
843 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
844 }
845 }
846 av_free(rt->rtsp_streams);
847 }
848
849 static int
850 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
851 {
852 RTSPState *rt = s->priv_data;
853 AVStream *st = NULL;
854
855 /* open the RTP context */
856 if (rtsp_st->stream_index >= 0)
857 st = s->streams[rtsp_st->stream_index];
858 if (!st)
859 s->ctx_flags |= AVFMTCTX_NOHEADER;
860
861 if (rt->transport == RTSP_TRANSPORT_RDT)
862 rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
863 rtsp_st->dynamic_protocol_context,
864 rtsp_st->dynamic_handler);
865 else
866 rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
867 rtsp_st->sdp_payload_type,
868 &rtsp_st->rtp_payload_data);
869
870 if (!rtsp_st->transport_priv) {
871 return AVERROR(ENOMEM);
872 } else if (rt->transport != RTSP_TRANSPORT_RDT) {
873 if(rtsp_st->dynamic_handler) {
874 rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
875 rtsp_st->dynamic_protocol_context,
876 rtsp_st->dynamic_handler);
877 }
878 }
879
880 return 0;
881 }
882
883 /**
884 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
885 */
886 static int
887 make_setup_request (AVFormatContext *s, const char *host, int port,
888 int lower_transport, const char *real_challenge)
889 {
890 RTSPState *rt = s->priv_data;
891 int rtx, j, i, err, interleave = 0;
892 RTSPStream *rtsp_st;
893 RTSPMessageHeader reply1, *reply = &reply1;
894 char cmd[2048];
895 const char *trans_pref;
896
897 if (rt->transport == RTSP_TRANSPORT_RDT)
898 trans_pref = "x-pn-tng";
899 else
900 trans_pref = "RTP/AVP";
901
902 /* for each stream, make the setup request */
903 /* XXX: we assume the same server is used for the control of each
904 RTSP stream */
905
906 for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
907 char transport[2048];
908
909 /**
910 * WMS serves all UDP data over a single connection, the RTX, which
911 * isn't necessarily the first in the SDP but has to be the first
912 * to be set up, else the second/third SETUP will fail with a 461.
913 */
914 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
915 rt->server_type == RTSP_SERVER_WMS) {
916 if (i == 0) {
917 /* rtx first */
918 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
919 int len = strlen(rt->rtsp_streams[rtx]->control_url);
920 if (len >= 4 &&
921 !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4, "/rtx"))
922 break;
923 }
924 if (rtx == rt->nb_rtsp_streams)
925 return -1; /* no RTX found */
926 rtsp_st = rt->rtsp_streams[rtx];
927 } else
928 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
929 } else
930 rtsp_st = rt->rtsp_streams[i];
931
932 /* RTP/UDP */
933 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
934 char buf[256];
935
936 if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
937 port = reply->transports[0].client_port_min;
938 goto have_port;
939 }
940
941 /* first try in specified port range */
942 if (RTSP_RTP_PORT_MIN != 0) {
943 while(j <= RTSP_RTP_PORT_MAX) {
944 snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
945 j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
946 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
947 goto rtp_opened;
948 }
949 }
950 }
951
952 /* then try on any port
953 ** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
954 ** err = AVERROR_INVALIDDATA;
955 ** goto fail;
956 ** }
957 */
958
959 rtp_opened:
960 port = rtp_get_local_port(rtsp_st->rtp_handle);
961 have_port:
962 snprintf(transport, sizeof(transport) - 1,
963 "%s/UDP;", trans_pref);
964 if (rt->server_type != RTSP_SERVER_REAL)
965 av_strlcat(transport, "unicast;", sizeof(transport));
966 av_strlcatf(transport, sizeof(transport),
967 "client_port=%d", port);
968 if (rt->transport == RTSP_TRANSPORT_RTP &&
969 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
970 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
971 }
972
973 /* RTP/TCP */
974 else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
975 /** For WMS streams, the application streams are only used for
976 * UDP. When trying to set it up for TCP streams, the server
977 * will return an error. Therefore, we skip those streams. */
978 if (rt->server_type == RTSP_SERVER_WMS &&
979 s->streams[rtsp_st->stream_index]->codec->codec_type == CODEC_TYPE_DATA)
980 continue;
981 snprintf(transport, sizeof(transport) - 1,
982 "%s/TCP;", trans_pref);
983 if (rt->server_type == RTSP_SERVER_WMS)
984 av_strlcat(transport, "unicast;", sizeof(transport));
985 av_strlcatf(transport, sizeof(transport),
986 "interleaved=%d-%d",
987 interleave, interleave + 1);
988 interleave += 2;
989 }
990
991 else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
992 snprintf(transport, sizeof(transport) - 1,
993 "%s/UDP;multicast", trans_pref);
994 }
995 if (rt->server_type == RTSP_SERVER_REAL ||
996 rt->server_type == RTSP_SERVER_WMS)
997 av_strlcat(transport, ";mode=play", sizeof(transport));
998 snprintf(cmd, sizeof(cmd),
999 "SETUP %s RTSP/1.0\r\n"
1000 "Transport: %s\r\n",
1001 rtsp_st->control_url, transport);
1002 if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1003 char real_res[41], real_csum[9];
1004 ff_rdt_calc_response_and_checksum(real_res, real_csum,
1005 real_challenge);
1006 av_strlcatf(cmd, sizeof(cmd),
1007 "If-Match: %s\r\n"
1008 "RealChallenge2: %s, sd=%s\r\n",
1009 rt->session_id, real_res, real_csum);
1010 }
1011 rtsp_send_cmd(s, cmd, reply, NULL);
1012 if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1013 err = 1;
1014 goto fail;
1015 } else if (reply->status_code != RTSP_STATUS_OK ||
1016 reply->nb_transports != 1) {
1017 err = AVERROR_INVALIDDATA;
1018 goto fail;
1019 }
1020
1021 /* XXX: same protocol for all streams is required */
1022 if (i > 0) {
1023 if (reply->transports[0].lower_transport != rt->lower_transport ||
1024 reply->transports[0].transport != rt->transport) {
1025 err = AVERROR_INVALIDDATA;
1026 goto fail;
1027 }
1028 } else {
1029 rt->lower_transport = reply->transports[0].lower_transport;
1030 rt->transport = reply->transports[0].transport;
1031 }
1032
1033 /* close RTP connection if not choosen */
1034 if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1035 (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1036 url_close(rtsp_st->rtp_handle);
1037 rtsp_st->rtp_handle = NULL;
1038 }
1039
1040 switch(reply->transports[0].lower_transport) {
1041 case RTSP_LOWER_TRANSPORT_TCP:
1042 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1043 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1044 break;
1045
1046 case RTSP_LOWER_TRANSPORT_UDP:
1047 {
1048 char url[1024];
1049
1050 /* XXX: also use address if specified */
1051 snprintf(url, sizeof(url), "rtp://%s:%d",
1052 host, reply->transports[0].server_port_min);
1053 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1054 rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1055 err = AVERROR_INVALIDDATA;
1056 goto fail;
1057 }
1058 }
1059 break;
1060 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1061 {
1062 char url[1024];
1063 struct in_addr in;
1064
1065 in.s_addr = htonl(reply->transports[0].destination);
1066 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1067 inet_ntoa(in),
1068 reply->transports[0].port_min,
1069 reply->transports[0].ttl);
1070 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1071 err = AVERROR_INVALIDDATA;
1072 goto fail;
1073 }
1074 }
1075 break;
1076 }
1077
1078 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1079 goto fail;
1080 }
1081
1082 if (rt->server_type == RTSP_SERVER_REAL)
1083 rt->need_subscription = 1;
1084
1085 return 0;
1086
1087 fail:
1088 for (i=0; i<rt->nb_rtsp_streams; i++) {
1089 if (rt->rtsp_streams[i]->rtp_handle) {
1090 url_close(rt->rtsp_streams[i]->rtp_handle);
1091 rt->rtsp_streams[i]->rtp_handle = NULL;
1092 }
1093 }
1094 return err;
1095 }
1096
1097 static int rtsp_read_header(AVFormatContext *s,
1098 AVFormatParameters *ap)
1099 {
1100 RTSPState *rt = s->priv_data;
1101 char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1102 URLContext *rtsp_hd;
1103 int port, ret, err;
1104 RTSPMessageHeader reply1, *reply = &reply1;
1105 unsigned char *content = NULL;
1106 int lower_transport_mask = 0;
1107 char real_challenge[64];
1108
1109 /* extract hostname and port */
1110 url_split(NULL, 0, NULL, 0,
1111 host, sizeof(host), &port, path, sizeof(path), s->filename);
1112 if (port < 0)
1113 port = RTSP_DEFAULT_PORT;
1114
1115 /* search for options */
1116 option_list = strchr(path, '?');
1117 if (option_list) {
1118 /* remove the options from the path */
1119 *option_list++ = 0;
1120 while(option_list) {
1121 /* move the option pointer */
1122 option = option_list;
1123 option_list = strchr(option_list, '&');
1124 if (option_list)
1125 *(option_list++) = 0;
1126 /* handle the options */
1127 if (strcmp(option, "udp") == 0)
1128 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1129 else if (strcmp(option, "multicast") == 0)
1130 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1131 else if (strcmp(option, "tcp") == 0)
1132 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1133 }
1134 }
1135
1136 if (!lower_transport_mask)
1137 lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1138
1139 /* open the tcp connexion */
1140 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1141 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1142 return AVERROR(EIO);
1143 rt->rtsp_hd = rtsp_hd;
1144 rt->seq = 0;
1145
1146 /* request options supported by the server; this also detects server type */
1147 for (rt->server_type = RTSP_SERVER_RTP;;) {
1148 snprintf(cmd, sizeof(cmd),
1149 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1150 if (rt->server_type == RTSP_SERVER_REAL)
1151 av_strlcat(cmd,
1152 /**
1153 * The following entries are required for proper
1154 * streaming from a Realmedia server. They are
1155 * interdependent in some way although we currently
1156 * don't quite understand how. Values were copied
1157 * from mplayer SVN r23589.
1158 * @param CompanyID is a 16-byte ID in base64
1159 * @param ClientChallenge is a 16-byte ID in hex
1160 */
1161 "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1162 "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1163 "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1164 "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1165 sizeof(cmd));
1166 rtsp_send_cmd(s, cmd, reply, NULL);
1167 if (reply->status_code != RTSP_STATUS_OK) {
1168 err = AVERROR_INVALIDDATA;
1169 goto fail;
1170 }
1171
1172 /* detect server type if not standard-compliant RTP */
1173 if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1174 rt->server_type = RTSP_SERVER_REAL;
1175 continue;
1176 } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1177 rt->server_type = RTSP_SERVER_WMS;
1178 } else if (rt->server_type == RTSP_SERVER_REAL) {
1179 strcpy(real_challenge, reply->real_challenge);
1180 }
1181 break;
1182 }
1183
1184 /* describe the stream */
1185 snprintf(cmd, sizeof(cmd),
1186 "DESCRIBE %s RTSP/1.0\r\n"
1187 "Accept: application/sdp\r\n",
1188 s->filename);
1189 if (rt->server_type == RTSP_SERVER_REAL) {
1190 /**
1191 * The Require: attribute is needed for proper streaming from
1192 * Realmedia servers.
1193 */
1194 av_strlcat(cmd,
1195 "Require: com.real.retain-entity-for-setup\r\n",
1196 sizeof(cmd));
1197 }
1198 rtsp_send_cmd(s, cmd, reply, &content);
1199 if (!content) {
1200 err = AVERROR_INVALIDDATA;
1201 goto fail;
1202 }
1203 if (reply->status_code != RTSP_STATUS_OK) {
1204 err = AVERROR_INVALIDDATA;
1205 goto fail;
1206 }
1207
1208 /* now we got the SDP description, we parse it */
1209 ret = sdp_parse(s, (const char *)content);
1210 av_freep(&content);
1211 if (ret < 0) {
1212 err = AVERROR_INVALIDDATA;
1213 goto fail;
1214 }
1215
1216 do {
1217 int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1218
1219 err = make_setup_request(s, host, port, lower_transport,
1220 rt->server_type == RTSP_SERVER_REAL ?
1221 real_challenge : NULL);
1222 if (err < 0)
1223 goto fail;
1224 lower_transport_mask &= ~(1 << lower_transport);
1225 if (lower_transport_mask == 0 && err == 1) {
1226 err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1227 goto fail;
1228 }
1229 } while (err);
1230
1231 rt->state = RTSP_STATE_IDLE;
1232 rt->seek_timestamp = 0; /* default is to start stream at position
1233 zero */
1234 if (ap->initial_pause) {
1235 /* do not start immediately */
1236 } else {
1237 if (rtsp_read_play(s) < 0) {
1238 err = AVERROR_INVALIDDATA;
1239 goto fail;
1240 }
1241 }
1242 return 0;
1243 fail:
1244 rtsp_close_streams(rt);
1245 av_freep(&content);
1246 url_close(rt->rtsp_hd);
1247 return err;
1248 }
1249
1250 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1251 uint8_t *buf, int buf_size)
1252 {
1253 RTSPState *rt = s->priv_data;
1254 int id, len, i, ret;
1255 RTSPStream *rtsp_st;
1256
1257 #ifdef DEBUG_RTP_TCP
1258 printf("tcp_read_packet:\n");
1259 #endif
1260 redo:
1261 for(;;) {
1262 ret = url_readbuf(rt->rtsp_hd, buf, 1);
1263 #ifdef DEBUG_RTP_TCP
1264 printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1265 #endif
1266 if (ret != 1)
1267 return -1;
1268 if (buf[0] == '$')
1269 break;
1270 }
1271 ret = url_readbuf(rt->rtsp_hd, buf, 3);
1272 if (ret != 3)
1273 return -1;
1274 id = buf[0];
1275 len = AV_RB16(buf + 1);
1276 #ifdef DEBUG_RTP_TCP
1277 printf("id=%d len=%d\n", id, len);
1278 #endif
1279 if (len > buf_size || len < 12)
1280 goto redo;
1281 /* get the data */
1282 ret = url_readbuf(rt->rtsp_hd, buf, len);
1283 if (ret != len)
1284 return -1;
1285 if (rt->transport == RTSP_TRANSPORT_RDT &&
1286 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1287 return -1;
1288
1289 /* find the matching stream */
1290 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1291 rtsp_st = rt->rtsp_streams[i];
1292 if (id >= rtsp_st->interleaved_min &&
1293 id <= rtsp_st->interleaved_max)
1294 goto found;
1295 }
1296 goto redo;
1297 found:
1298 *prtsp_st = rtsp_st;
1299 return len;
1300 }
1301
1302 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1303 uint8_t *buf, int buf_size)
1304 {
1305 RTSPState *rt = s->priv_data;
1306 RTSPStream *rtsp_st;
1307 fd_set rfds;
1308 int fd1, fd2, fd_max, n, i, ret;
1309 struct timeval tv;
1310
1311 for(;;) {
1312 if (url_interrupt_cb())
1313 return AVERROR(EINTR);
1314 FD_ZERO(&rfds);
1315 fd_max = -1;
1316 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1317 rtsp_st = rt->rtsp_streams[i];
1318 if (rtsp_st->rtp_handle) {
1319 /* currently, we cannot probe RTCP handle because of
1320 * blocking restrictions */
1321 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1322 if (fd1 > fd_max)
1323 fd_max = fd1;
1324 FD_SET(fd1, &rfds);
1325 }
1326 }
1327 tv.tv_sec = 0;
1328 tv.tv_usec = 100 * 1000;
1329 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1330 if (n > 0) {
1331 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1332 rtsp_st = rt->rtsp_streams[i];
1333 if (rtsp_st->rtp_handle) {
1334 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1335 if (FD_ISSET(fd1, &rfds)) {
1336 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1337 if (ret > 0) {
1338 *prtsp_st = rtsp_st;
1339 return ret;
1340 }
1341 }
1342 }
1343 }
1344 }
1345 }
1346 }
1347
1348 static int rtsp_read_packet(AVFormatContext *s,
1349 AVPacket *pkt)
1350 {
1351 RTSPState *rt = s->priv_data;
1352 RTSPStream *rtsp_st;
1353 int ret, len;
1354 uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1355
1356 if (rt->server_type == RTSP_SERVER_REAL) {
1357 int i;
1358 RTSPMessageHeader reply1, *reply = &reply1;
1359 enum AVDiscard cache[MAX_STREAMS];
1360 char cmd[1024];
1361
1362 for (i = 0; i < s->nb_streams; i++)
1363 cache[i] = s->streams[i]->discard;
1364
1365 if (!rt->need_subscription) {
1366 if (memcmp (cache, rt->real_setup_cache,
1367 sizeof(enum AVDiscard) * s->nb_streams)) {
1368 av_strlcatf(cmd, sizeof(cmd),
1369 "SET_PARAMETER %s RTSP/1.0\r\n"
1370 "Unsubscribe: %s\r\n",
1371 s->filename, rt->last_subscription);
1372 rtsp_send_cmd(s, cmd, reply, NULL);
1373 if (reply->status_code != RTSP_STATUS_OK)
1374 return AVERROR_INVALIDDATA;
1375 rt->need_subscription = 1;
1376 }
1377 }
1378
1379 if (rt->need_subscription) {
1380 int r, rule_nr, first = 1;
1381
1382 memcpy(rt->real_setup_cache, cache,
1383 sizeof(enum AVDiscard) * s->nb_streams);
1384 rt->last_subscription[0] = 0;
1385
1386 snprintf(cmd, sizeof(cmd),
1387 "SET_PARAMETER %s RTSP/1.0\r\n"
1388 "Subscribe: ",
1389 s->filename);
1390 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1391 rule_nr = 0;
1392 for (r = 0; r < s->nb_streams; r++) {
1393 if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1394 if (s->streams[r]->discard != AVDISCARD_ALL) {
1395 if (!first)
1396 av_strlcat(rt->last_subscription, ",",
1397 sizeof(rt->last_subscription));
1398 ff_rdt_subscribe_rule(
1399 rt->last_subscription,
1400 sizeof(rt->last_subscription), i, rule_nr);
1401 first = 0;
1402 }
1403 rule_nr++;
1404 }
1405 }
1406 }
1407 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1408 rtsp_send_cmd(s, cmd, reply, NULL);
1409 if (reply->status_code != RTSP_STATUS_OK)
1410 return AVERROR_INVALIDDATA;
1411 rt->need_subscription = 0;
1412
1413 if (rt->state == RTSP_STATE_PLAYING)
1414 rtsp_read_play (s);
1415 }
1416 }
1417
1418 /* get next frames from the same RTP packet */
1419 if (rt->cur_transport_priv) {
1420 if (rt->transport == RTSP_TRANSPORT_RDT)
1421 ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1422 else
1423 ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1424 if (ret == 0) {
1425 rt->cur_transport_priv = NULL;
1426 return 0;
1427 } else if (ret == 1) {
1428 return 0;
1429 } else {
1430 rt->cur_transport_priv = NULL;
1431 }
1432 }
1433
1434 /* read next RTP packet */
1435 redo:
1436 switch(rt->lower_transport) {
1437 default:
1438 case RTSP_LOWER_TRANSPORT_TCP:
1439 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1440 break;
1441 case RTSP_LOWER_TRANSPORT_UDP:
1442 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1443 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1444 if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1445 rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1446 break;
1447 }
1448 if (len < 0)
1449 return len;
1450 if (rt->transport == RTSP_TRANSPORT_RDT)
1451 ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1452 else
1453 ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1454 if (ret < 0)
1455 goto redo;
1456 if (ret == 1) {
1457 /* more packets may follow, so we save the RTP context */
1458 rt->cur_transport_priv = rtsp_st->transport_priv;
1459 }
1460 return 0;
1461 }
1462
1463 static int rtsp_read_play(AVFormatContext *s)
1464 {
1465 RTSPState *rt = s->priv_data;
1466 RTSPMessageHeader reply1, *reply = &reply1;
1467 char cmd[1024];
1468
1469 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1470
1471 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1472 if (rt->state == RTSP_STATE_PAUSED) {
1473 snprintf(cmd, sizeof(cmd),
1474 "PLAY %s RTSP/1.0\r\n",
1475 s->filename);
1476 } else {
1477 snprintf(cmd, sizeof(cmd),
1478 "PLAY %s RTSP/1.0\r\n"
1479 "Range: npt=%0.3f-\r\n",
1480 s->filename,
1481 (double)rt->seek_timestamp / AV_TIME_BASE);
1482 }
1483 rtsp_send_cmd(s, cmd, reply, NULL);
1484 if (reply->status_code != RTSP_STATUS_OK) {
1485 return -1;
1486 }
1487 }
1488 rt->state = RTSP_STATE_PLAYING;
1489 return 0;
1490 }
1491
1492 /* pause the stream */
1493 static int rtsp_read_pause(AVFormatContext *s)
1494 {
1495 RTSPState *rt = s->priv_data;
1496 RTSPMessageHeader reply1, *reply = &reply1;
1497 char cmd[1024];
1498
1499 rt = s->priv_data;
1500
1501 if (rt->state != RTSP_STATE_PLAYING)
1502 return 0;
1503 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1504 snprintf(cmd, sizeof(cmd),
1505 "PAUSE %s RTSP/1.0\r\n",
1506 s->filename);
1507 rtsp_send_cmd(s, cmd, reply, NULL);
1508 if (reply->status_code != RTSP_STATUS_OK) {
1509 return -1;
1510 }
1511 }
1512 rt->state = RTSP_STATE_PAUSED;
1513 return 0;
1514 }
1515
1516 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1517 int64_t timestamp, int flags)
1518 {
1519 RTSPState *rt = s->priv_data;
1520
1521 rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1522 switch(rt->state) {
1523 default:
1524 case RTSP_STATE_IDLE:
1525 break;
1526 case RTSP_STATE_PLAYING:
1527 if (rtsp_read_play(s) != 0)
1528 return -1;
1529 break;
1530 case RTSP_STATE_PAUSED:
1531 rt->state = RTSP_STATE_IDLE;
1532 break;
1533 }
1534 return 0;
1535 }
1536
1537 static int rtsp_read_close(AVFormatContext *s)
1538 {
1539 RTSPState *rt = s->priv_data;
1540 RTSPMessageHeader reply1, *reply = &reply1;
1541 char cmd[1024];
1542
1543 #if 0
1544 /* NOTE: it is valid to flush the buffer here */
1545 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1546 url_fclose(&rt->rtsp_gb);
1547 }
1548 #endif
1549 snprintf(cmd, sizeof(cmd),
1550 "TEARDOWN %s RTSP/1.0\r\n",
1551 s->filename);
1552 rtsp_send_cmd(s, cmd, reply, NULL);
1553
1554 rtsp_close_streams(rt);
1555 url_close(rt->rtsp_hd);
1556 return 0;
1557 }
1558
1559 #if CONFIG_RTSP_DEMUXER
1560 AVInputFormat rtsp_demuxer = {
1561 "rtsp",
1562 NULL_IF_CONFIG_SMALL("RTSP input format"),
1563 sizeof(RTSPState),
1564 rtsp_probe,
1565 rtsp_read_header,
1566 rtsp_read_packet,
1567 rtsp_read_close,
1568 rtsp_read_seek,
1569 .flags = AVFMT_NOFILE,
1570 .read_play = rtsp_read_play,
1571 .read_pause = rtsp_read_pause,
1572 };
1573 #endif
1574
1575 static int sdp_probe(AVProbeData *p1)
1576 {
1577 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1578
1579 /* we look for a line beginning "c=IN IP4" */
1580 while (p < p_end && *p != '\0') {
1581 if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1582 return AVPROBE_SCORE_MAX / 2;
1583
1584 while(p < p_end - 1 && *p != '\n') p++;
1585 if (++p >= p_end)
1586 break;
1587 if (*p == '\r')
1588 p++;
1589 }
1590 return 0;
1591 }
1592
1593 #define SDP_MAX_SIZE 8192
1594
1595 static int sdp_read_header(AVFormatContext *s,
1596 AVFormatParameters *ap)
1597 {
1598 RTSPState *rt = s->priv_data;
1599 RTSPStream *rtsp_st;
1600 int size, i, err;
1601 char *content;
1602 char url[1024];
1603
1604 /* read the whole sdp file */
1605 /* XXX: better loading */
1606 content = av_malloc(SDP_MAX_SIZE);
1607 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1608 if (size <= 0) {
1609 av_free(content);
1610 return AVERROR_INVALIDDATA;
1611 }
1612 content[size] ='\0';
1613
1614 sdp_parse(s, content);
1615 av_free(content);
1616
1617 /* open each RTP stream */
1618 for(i=0;i<rt->nb_rtsp_streams;i++) {
1619 rtsp_st = rt->rtsp_streams[i];
1620
1621 snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1622 inet_ntoa(rtsp_st->sdp_ip),
1623 rtsp_st->sdp_port,
1624 rtsp_st->sdp_port,
1625 rtsp_st->sdp_ttl);
1626 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1627 err = AVERROR_INVALIDDATA;
1628 goto fail;
1629 }
1630 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1631 goto fail;
1632 }
1633 return 0;
1634 fail:
1635 rtsp_close_streams(rt);
1636 return err;
1637 }
1638
1639 static int sdp_read_packet(AVFormatContext *s,
1640 AVPacket *pkt)
1641 {
1642 return rtsp_read_packet(s, pkt);
1643 }
1644
1645 static int sdp_read_close(AVFormatContext *s)
1646 {
1647 RTSPState *rt = s->priv_data;
1648 rtsp_close_streams(rt);
1649 return 0;
1650 }
1651
1652 #if CONFIG_SDP_DEMUXER
1653 AVInputFormat sdp_demuxer = {
1654 "sdp",
1655 NULL_IF_CONFIG_SMALL("SDP"),
1656 sizeof(RTSPState),
1657 sdp_probe,
1658 sdp_read_header,
1659 sdp_read_packet,
1660 sdp_read_close,
1661 };
1662 #endif
1663
1664 #if CONFIG_REDIR_DEMUXER
1665 /* dummy redirector format (used directly in av_open_input_file now) */
1666 static int redir_probe(AVProbeData *pd)
1667 {
1668 const char *p;
1669 p = pd->buf;
1670 while (redir_isspace(*p))
1671 p++;
1672 if (av_strstart(p, "http://", NULL) ||
1673 av_strstart(p, "rtsp://", NULL))
1674 return AVPROBE_SCORE_MAX;
1675 return 0;
1676 }
1677
1678 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1679 {
1680 char buf[4096], *q;
1681 int c;
1682 AVFormatContext *ic = NULL;
1683 ByteIOContext *f = s->pb;
1684
1685 /* parse each URL and try to open it */
1686 c = url_fgetc(f);
1687 while (c != URL_EOF) {
1688 /* skip spaces */
1689 for(;;) {
1690 if (!redir_isspace(c))
1691 break;
1692 c = url_fgetc(f);
1693 }
1694 if (c == URL_EOF)
1695 break;
1696 /* record url */
1697 q = buf;
1698 for(;;) {
1699 if (c == URL_EOF || redir_isspace(c))
1700 break;
1701 if ((q - buf) < sizeof(buf) - 1)
1702 *q++ = c;
1703 c = url_fgetc(f);
1704 }
1705 *q = '\0';
1706 //printf("URL='%s'\n", buf);
1707 /* try to open the media file */
1708 if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1709 break;
1710 }
1711 if (!ic)
1712 return AVERROR(EIO);
1713
1714 *s = *ic;
1715 url_fclose(f);
1716
1717 return 0;
1718 }
1719
1720 AVInputFormat redir_demuxer = {
1721 "redir",
1722 NULL_IF_CONFIG_SMALL("Redirector format"),
1723 0,
1724 redir_probe,
1725 redir_read_header,
1726 NULL,
1727 NULL,
1728 };
1729 #endif