a7bd0199ff8efe2b2ef73e8a93f1958e5ad4b200
[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 {
396 s1->skip_media = 1;
397 return;
398 }
399 rtsp_st = av_mallocz(sizeof(RTSPStream));
400 if (!rtsp_st)
401 return;
402 rtsp_st->stream_index = -1;
403 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
404
405 rtsp_st->sdp_ip = s1->default_ip;
406 rtsp_st->sdp_ttl = s1->default_ttl;
407
408 get_word(buf1, sizeof(buf1), &p); /* port */
409 rtsp_st->sdp_port = atoi(buf1);
410
411 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
412
413 /* XXX: handle list of formats */
414 get_word(buf1, sizeof(buf1), &p); /* format list */
415 rtsp_st->sdp_payload_type = atoi(buf1);
416
417 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
418 /* no corresponding stream */
419 } else {
420 st = av_new_stream(s, 0);
421 if (!st)
422 return;
423 st->priv_data = rtsp_st;
424 rtsp_st->stream_index = st->index;
425 st->codec->codec_type = codec_type;
426 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
427 /* if standard payload type, we can find the codec right now */
428 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
429 }
430 }
431 /* put a default control url */
432 av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
433 break;
434 case 'a':
435 if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
436 char proto[32];
437 /* get the control url */
438 st = s->streams[s->nb_streams - 1];
439 rtsp_st = st->priv_data;
440
441 /* XXX: may need to add full url resolution */
442 url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
443 if (proto[0] == '\0') {
444 /* relative control URL */
445 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
446 av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
447 } else {
448 av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
449 }
450 } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
451 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
452 get_word(buf1, sizeof(buf1), &p);
453 payload_type = atoi(buf1);
454 st = s->streams[s->nb_streams - 1];
455 rtsp_st = st->priv_data;
456 sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
457 } else if (av_strstart(p, "fmtp:", &p)) {
458 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
459 get_word(buf1, sizeof(buf1), &p);
460 payload_type = atoi(buf1);
461 for(i = 0; i < s->nb_streams;i++) {
462 st = s->streams[i];
463 rtsp_st = st->priv_data;
464 if (rtsp_st->sdp_payload_type == payload_type) {
465 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
466 if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
467 sdp_parse_fmtp(st, p);
468 }
469 } else {
470 sdp_parse_fmtp(st, p);
471 }
472 }
473 }
474 } else if(av_strstart(p, "framesize:", &p)) {
475 // let dynamic protocol handlers have a stab at the line.
476 get_word(buf1, sizeof(buf1), &p);
477 payload_type = atoi(buf1);
478 for(i = 0; i < s->nb_streams;i++) {
479 st = s->streams[i];
480 rtsp_st = st->priv_data;
481 if (rtsp_st->sdp_payload_type == payload_type) {
482 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
483 rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
484 }
485 }
486 }
487 } else if(av_strstart(p, "range:", &p)) {
488 int64_t start, end;
489
490 // this is so that seeking on a streamed file can work.
491 rtsp_parse_range_npt(p, &start, &end);
492 s->start_time= start;
493 s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
494 } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
495 if (atoi(p) == 1)
496 rt->transport = RTSP_TRANSPORT_RDT;
497 } else if (s->nb_streams > 0) {
498 if (rt->server_type == RTSP_SERVER_REAL)
499 ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
500
501 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
502 if (rtsp_st->dynamic_handler &&
503 rtsp_st->dynamic_handler->parse_sdp_a_line)
504 rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
505 rtsp_st->dynamic_protocol_context, buf);
506 }
507 break;
508 }
509 }
510
511 static int sdp_parse(AVFormatContext *s, const char *content)
512 {
513 const char *p;
514 int letter;
515 /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
516 * contain long SDP lines containing complete ASF Headers (several
517 * kB) or arrays of MDPR (RM stream descriptor) headers plus
518 * "rulebooks" describing their properties. Therefore, the SDP line
519 * buffer is large. */
520 char buf[8192], *q;
521 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
522
523 memset(s1, 0, sizeof(SDPParseState));
524 p = content;
525 for(;;) {
526 skip_spaces(&p);
527 letter = *p;
528 if (letter == '\0')
529 break;
530 p++;
531 if (*p != '=')
532 goto next_line;
533 p++;
534 /* get the content */
535 q = buf;
536 while (*p != '\n' && *p != '\r' && *p != '\0') {
537 if ((q - buf) < sizeof(buf) - 1)
538 *q++ = *p;
539 p++;
540 }
541 *q = '\0';
542 sdp_parse_line(s, s1, letter, buf);
543 next_line:
544 while (*p != '\n' && *p != '\0')
545 p++;
546 if (*p == '\n')
547 p++;
548 }
549 return 0;
550 }
551
552 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
553 {
554 const char *p;
555 int v;
556
557 p = *pp;
558 skip_spaces(&p);
559 v = strtol(p, (char **)&p, 10);
560 if (*p == '-') {
561 p++;
562 *min_ptr = v;
563 v = strtol(p, (char **)&p, 10);
564 *max_ptr = v;
565 } else {
566 *min_ptr = v;
567 *max_ptr = v;
568 }
569 *pp = p;
570 }
571
572 /* XXX: only one transport specification is parsed */
573 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
574 {
575 char transport_protocol[16];
576 char profile[16];
577 char lower_transport[16];
578 char parameter[16];
579 RTSPTransportField *th;
580 char buf[256];
581
582 reply->nb_transports = 0;
583
584 for(;;) {
585 skip_spaces(&p);
586 if (*p == '\0')
587 break;
588
589 th = &reply->transports[reply->nb_transports];
590
591 get_word_sep(transport_protocol, sizeof(transport_protocol),
592 "/", &p);
593 if (*p == '/')
594 p++;
595 if (!strcasecmp (transport_protocol, "rtp")) {
596 get_word_sep(profile, sizeof(profile), "/;,", &p);
597 lower_transport[0] = '\0';
598 /* rtp/avp/<protocol> */
599 if (*p == '/') {
600 p++;
601 get_word_sep(lower_transport, sizeof(lower_transport),
602 ";,", &p);
603 }
604 th->transport = RTSP_TRANSPORT_RTP;
605 } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
606 !strcasecmp (transport_protocol, "x-real-rdt")) {
607 /* x-pn-tng/<protocol> */
608 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
609 profile[0] = '\0';
610 th->transport = RTSP_TRANSPORT_RDT;
611 }
612 if (!strcasecmp(lower_transport, "TCP"))
613 th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
614 else
615 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
616
617 if (*p == ';')
618 p++;
619 /* get each parameter */
620 while (*p != '\0' && *p != ',') {
621 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
622 if (!strcmp(parameter, "port")) {
623 if (*p == '=') {
624 p++;
625 rtsp_parse_range(&th->port_min, &th->port_max, &p);
626 }
627 } else if (!strcmp(parameter, "client_port")) {
628 if (*p == '=') {
629 p++;
630 rtsp_parse_range(&th->client_port_min,
631 &th->client_port_max, &p);
632 }
633 } else if (!strcmp(parameter, "server_port")) {
634 if (*p == '=') {
635 p++;
636 rtsp_parse_range(&th->server_port_min,
637 &th->server_port_max, &p);
638 }
639 } else if (!strcmp(parameter, "interleaved")) {
640 if (*p == '=') {
641 p++;
642 rtsp_parse_range(&th->interleaved_min,
643 &th->interleaved_max, &p);
644 }
645 } else if (!strcmp(parameter, "multicast")) {
646 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
647 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
648 } else if (!strcmp(parameter, "ttl")) {
649 if (*p == '=') {
650 p++;
651 th->ttl = strtol(p, (char **)&p, 10);
652 }
653 } else if (!strcmp(parameter, "destination")) {
654 struct in_addr ipaddr;
655
656 if (*p == '=') {
657 p++;
658 get_word_sep(buf, sizeof(buf), ";,", &p);
659 if (inet_aton(buf, &ipaddr))
660 th->destination = ntohl(ipaddr.s_addr);
661 }
662 }
663 while (*p != ';' && *p != '\0' && *p != ',')
664 p++;
665 if (*p == ';')
666 p++;
667 }
668 if (*p == ',')
669 p++;
670
671 reply->nb_transports++;
672 }
673 }
674
675 void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
676 {
677 const char *p;
678
679 /* NOTE: we do case independent match for broken servers */
680 p = buf;
681 if (av_stristart(p, "Session:", &p)) {
682 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
683 } else if (av_stristart(p, "Content-Length:", &p)) {
684 reply->content_length = strtol(p, NULL, 10);
685 } else if (av_stristart(p, "Transport:", &p)) {
686 rtsp_parse_transport(reply, p);
687 } else if (av_stristart(p, "CSeq:", &p)) {
688 reply->seq = strtol(p, NULL, 10);
689 } else if (av_stristart(p, "Range:", &p)) {
690 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
691 } else if (av_stristart(p, "RealChallenge1:", &p)) {
692 skip_spaces(&p);
693 av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
694 } else if (av_stristart(p, "Server:", &p)) {
695 skip_spaces(&p);
696 av_strlcpy(reply->server, p, sizeof(reply->server));
697 }
698 }
699
700 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
701 {
702 int ret, len;
703
704 len = 0;
705 while (len < size) {
706 ret = url_read(h, buf+len, size-len);
707 if (ret < 1)
708 return ret;
709 len += ret;
710 }
711 return len;
712 }
713
714 /* skip a RTP/TCP interleaved packet */
715 static void rtsp_skip_packet(AVFormatContext *s)
716 {
717 RTSPState *rt = s->priv_data;
718 int ret, len, len1;
719 uint8_t buf[1024];
720
721 ret = url_readbuf(rt->rtsp_hd, buf, 3);
722 if (ret != 3)
723 return;
724 len = AV_RB16(buf + 1);
725 #ifdef DEBUG
726 printf("skipping RTP packet len=%d\n", len);
727 #endif
728 /* skip payload */
729 while (len > 0) {
730 len1 = len;
731 if (len1 > sizeof(buf))
732 len1 = sizeof(buf);
733 ret = url_readbuf(rt->rtsp_hd, buf, len1);
734 if (ret != len1)
735 return;
736 len -= len1;
737 }
738 }
739
740 static void rtsp_send_cmd(AVFormatContext *s,
741 const char *cmd, RTSPMessageHeader *reply,
742 unsigned char **content_ptr)
743 {
744 RTSPState *rt = s->priv_data;
745 char buf[4096], buf1[1024], *q;
746 unsigned char ch;
747 const char *p;
748 int content_length, line_count;
749 unsigned char *content = NULL;
750
751 memset(reply, 0, sizeof(*reply));
752
753 rt->seq++;
754 av_strlcpy(buf, cmd, sizeof(buf));
755 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
756 av_strlcat(buf, buf1, sizeof(buf));
757 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
758 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
759 av_strlcat(buf, buf1, sizeof(buf));
760 }
761 av_strlcat(buf, "\r\n", sizeof(buf));
762 #ifdef DEBUG
763 printf("Sending:\n%s--\n", buf);
764 #endif
765 url_write(rt->rtsp_hd, buf, strlen(buf));
766
767 /* parse reply (XXX: use buffers) */
768 line_count = 0;
769 rt->last_reply[0] = '\0';
770 for(;;) {
771 q = buf;
772 for(;;) {
773 if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
774 break;
775 if (ch == '\n')
776 break;
777 if (ch == '$') {
778 /* XXX: only parse it if first char on line ? */
779 rtsp_skip_packet(s);
780 } else if (ch != '\r') {
781 if ((q - buf) < sizeof(buf) - 1)
782 *q++ = ch;
783 }
784 }
785 *q = '\0';
786 #ifdef DEBUG
787 printf("line='%s'\n", buf);
788 #endif
789 /* test if last line */
790 if (buf[0] == '\0')
791 break;
792 p = buf;
793 if (line_count == 0) {
794 /* get reply code */
795 get_word(buf1, sizeof(buf1), &p);
796 get_word(buf1, sizeof(buf1), &p);
797 reply->status_code = atoi(buf1);
798 } else {
799 rtsp_parse_line(reply, p);
800 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
801 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
802 }
803 line_count++;
804 }
805
806 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
807 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
808
809 content_length = reply->content_length;
810 if (content_length > 0) {
811 /* leave some room for a trailing '\0' (useful for simple parsing) */
812 content = av_malloc(content_length + 1);
813 (void)url_readbuf(rt->rtsp_hd, content, content_length);
814 content[content_length] = '\0';
815 }
816 if (content_ptr)
817 *content_ptr = content;
818 else
819 av_free(content);
820 }
821
822
823 /* close and free RTSP streams */
824 static void rtsp_close_streams(RTSPState *rt)
825 {
826 int i;
827 RTSPStream *rtsp_st;
828
829 for(i=0;i<rt->nb_rtsp_streams;i++) {
830 rtsp_st = rt->rtsp_streams[i];
831 if (rtsp_st) {
832 if (rtsp_st->transport_priv) {
833 if (rt->transport == RTSP_TRANSPORT_RDT)
834 ff_rdt_parse_close(rtsp_st->transport_priv);
835 else
836 rtp_parse_close(rtsp_st->transport_priv);
837 }
838 if (rtsp_st->rtp_handle)
839 url_close(rtsp_st->rtp_handle);
840 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
841 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
842 }
843 }
844 av_free(rt->rtsp_streams);
845 }
846
847 static int
848 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
849 {
850 RTSPState *rt = s->priv_data;
851 AVStream *st = NULL;
852
853 /* open the RTP context */
854 if (rtsp_st->stream_index >= 0)
855 st = s->streams[rtsp_st->stream_index];
856 if (!st)
857 s->ctx_flags |= AVFMTCTX_NOHEADER;
858
859 if (rt->transport == RTSP_TRANSPORT_RDT)
860 rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
861 rtsp_st->dynamic_protocol_context,
862 rtsp_st->dynamic_handler);
863 else
864 rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
865 rtsp_st->sdp_payload_type,
866 &rtsp_st->rtp_payload_data);
867
868 if (!rtsp_st->transport_priv) {
869 return AVERROR(ENOMEM);
870 } else if (rt->transport != RTSP_TRANSPORT_RDT) {
871 if(rtsp_st->dynamic_handler) {
872 rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
873 rtsp_st->dynamic_protocol_context,
874 rtsp_st->dynamic_handler);
875 }
876 }
877
878 return 0;
879 }
880
881 /**
882 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
883 */
884 static int
885 make_setup_request (AVFormatContext *s, const char *host, int port,
886 int lower_transport, const char *real_challenge)
887 {
888 RTSPState *rt = s->priv_data;
889 int j, i, err, interleave = 0;
890 RTSPStream *rtsp_st;
891 RTSPMessageHeader reply1, *reply = &reply1;
892 char cmd[2048];
893 const char *trans_pref;
894
895 if (rt->transport == RTSP_TRANSPORT_RDT)
896 trans_pref = "x-pn-tng";
897 else
898 trans_pref = "RTP/AVP";
899
900 /* for each stream, make the setup request */
901 /* XXX: we assume the same server is used for the control of each
902 RTSP stream */
903
904 for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
905 char transport[2048];
906
907 rtsp_st = rt->rtsp_streams[i];
908
909 /* RTP/UDP */
910 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
911 char buf[256];
912
913 /* first try in specified port range */
914 if (RTSP_RTP_PORT_MIN != 0) {
915 while(j <= RTSP_RTP_PORT_MAX) {
916 snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
917 j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
918 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
919 goto rtp_opened;
920 }
921 }
922 }
923
924 /* then try on any port
925 ** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
926 ** err = AVERROR_INVALIDDATA;
927 ** goto fail;
928 ** }
929 */
930
931 rtp_opened:
932 port = rtp_get_local_port(rtsp_st->rtp_handle);
933 snprintf(transport, sizeof(transport) - 1,
934 "%s/UDP;", trans_pref);
935 if (rt->server_type != RTSP_SERVER_REAL)
936 av_strlcat(transport, "unicast;", sizeof(transport));
937 av_strlcatf(transport, sizeof(transport),
938 "client_port=%d", port);
939 if (rt->transport == RTSP_TRANSPORT_RTP)
940 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
941 }
942
943 /* RTP/TCP */
944 else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
945 snprintf(transport, sizeof(transport) - 1,
946 "%s/TCP;", trans_pref);
947 if (rt->server_type == RTSP_SERVER_WMS)
948 av_strlcat(transport, "unicast;", sizeof(transport));
949 av_strlcatf(transport, sizeof(transport),
950 "interleaved=%d-%d",
951 interleave, interleave + 1);
952 interleave += 2;
953 }
954
955 else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
956 snprintf(transport, sizeof(transport) - 1,
957 "%s/UDP;multicast", trans_pref);
958 }
959 if (rt->server_type == RTSP_SERVER_REAL ||
960 rt->server_type == RTSP_SERVER_WMS)
961 av_strlcat(transport, ";mode=play", sizeof(transport));
962 snprintf(cmd, sizeof(cmd),
963 "SETUP %s RTSP/1.0\r\n"
964 "Transport: %s\r\n",
965 rtsp_st->control_url, transport);
966 if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
967 char real_res[41], real_csum[9];
968 ff_rdt_calc_response_and_checksum(real_res, real_csum,
969 real_challenge);
970 av_strlcatf(cmd, sizeof(cmd),
971 "If-Match: %s\r\n"
972 "RealChallenge2: %s, sd=%s\r\n",
973 rt->session_id, real_res, real_csum);
974 }
975 rtsp_send_cmd(s, cmd, reply, NULL);
976 if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
977 err = 1;
978 goto fail;
979 } else if (reply->status_code != RTSP_STATUS_OK ||
980 reply->nb_transports != 1) {
981 err = AVERROR_INVALIDDATA;
982 goto fail;
983 }
984
985 /* XXX: same protocol for all streams is required */
986 if (i > 0) {
987 if (reply->transports[0].lower_transport != rt->lower_transport ||
988 reply->transports[0].transport != rt->transport) {
989 err = AVERROR_INVALIDDATA;
990 goto fail;
991 }
992 } else {
993 rt->lower_transport = reply->transports[0].lower_transport;
994 rt->transport = reply->transports[0].transport;
995 }
996
997 /* close RTP connection if not choosen */
998 if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
999 (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1000 url_close(rtsp_st->rtp_handle);
1001 rtsp_st->rtp_handle = NULL;
1002 }
1003
1004 switch(reply->transports[0].lower_transport) {
1005 case RTSP_LOWER_TRANSPORT_TCP:
1006 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1007 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1008 break;
1009
1010 case RTSP_LOWER_TRANSPORT_UDP:
1011 {
1012 char url[1024];
1013
1014 /* XXX: also use address if specified */
1015 snprintf(url, sizeof(url), "rtp://%s:%d",
1016 host, reply->transports[0].server_port_min);
1017 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1018 err = AVERROR_INVALIDDATA;
1019 goto fail;
1020 }
1021 }
1022 break;
1023 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1024 {
1025 char url[1024];
1026 struct in_addr in;
1027
1028 in.s_addr = htonl(reply->transports[0].destination);
1029 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1030 inet_ntoa(in),
1031 reply->transports[0].port_min,
1032 reply->transports[0].ttl);
1033 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1034 err = AVERROR_INVALIDDATA;
1035 goto fail;
1036 }
1037 }
1038 break;
1039 }
1040
1041 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1042 goto fail;
1043 }
1044
1045 if (rt->server_type == RTSP_SERVER_REAL)
1046 rt->need_subscription = 1;
1047
1048 return 0;
1049
1050 fail:
1051 for (i=0; i<rt->nb_rtsp_streams; i++) {
1052 if (rt->rtsp_streams[i]->rtp_handle) {
1053 url_close(rt->rtsp_streams[i]->rtp_handle);
1054 rt->rtsp_streams[i]->rtp_handle = NULL;
1055 }
1056 }
1057 return err;
1058 }
1059
1060 static int rtsp_read_header(AVFormatContext *s,
1061 AVFormatParameters *ap)
1062 {
1063 RTSPState *rt = s->priv_data;
1064 char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1065 URLContext *rtsp_hd;
1066 int port, ret, err;
1067 RTSPMessageHeader reply1, *reply = &reply1;
1068 unsigned char *content = NULL;
1069 int lower_transport_mask = 0;
1070 char real_challenge[64];
1071
1072 /* extract hostname and port */
1073 url_split(NULL, 0, NULL, 0,
1074 host, sizeof(host), &port, path, sizeof(path), s->filename);
1075 if (port < 0)
1076 port = RTSP_DEFAULT_PORT;
1077
1078 /* search for options */
1079 option_list = strchr(path, '?');
1080 if (option_list) {
1081 /* remove the options from the path */
1082 *option_list++ = 0;
1083 while(option_list) {
1084 /* move the option pointer */
1085 option = option_list;
1086 option_list = strchr(option_list, '&');
1087 if (option_list)
1088 *(option_list++) = 0;
1089 /* handle the options */
1090 if (strcmp(option, "udp") == 0)
1091 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1092 else if (strcmp(option, "multicast") == 0)
1093 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1094 else if (strcmp(option, "tcp") == 0)
1095 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1096 }
1097 }
1098
1099 if (!lower_transport_mask)
1100 lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1101
1102 /* open the tcp connexion */
1103 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1104 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1105 return AVERROR(EIO);
1106 rt->rtsp_hd = rtsp_hd;
1107 rt->seq = 0;
1108
1109 /* request options supported by the server; this also detects server type */
1110 for (rt->server_type = RTSP_SERVER_RTP;;) {
1111 snprintf(cmd, sizeof(cmd),
1112 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1113 if (rt->server_type == RTSP_SERVER_REAL)
1114 av_strlcat(cmd,
1115 /**
1116 * The following entries are required for proper
1117 * streaming from a Realmedia server. They are
1118 * interdependent in some way although we currently
1119 * don't quite understand how. Values were copied
1120 * from mplayer SVN r23589.
1121 * @param CompanyID is a 16-byte ID in base64
1122 * @param ClientChallenge is a 16-byte ID in hex
1123 */
1124 "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1125 "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1126 "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1127 "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1128 sizeof(cmd));
1129 rtsp_send_cmd(s, cmd, reply, NULL);
1130 if (reply->status_code != RTSP_STATUS_OK) {
1131 err = AVERROR_INVALIDDATA;
1132 goto fail;
1133 }
1134
1135 /* detect server type if not standard-compliant RTP */
1136 if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1137 rt->server_type = RTSP_SERVER_REAL;
1138 continue;
1139 } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1140 rt->server_type = RTSP_SERVER_WMS;
1141 } else if (rt->server_type == RTSP_SERVER_REAL) {
1142 strcpy(real_challenge, reply->real_challenge);
1143 }
1144 break;
1145 }
1146
1147 /* describe the stream */
1148 snprintf(cmd, sizeof(cmd),
1149 "DESCRIBE %s RTSP/1.0\r\n"
1150 "Accept: application/sdp\r\n",
1151 s->filename);
1152 if (rt->server_type == RTSP_SERVER_REAL) {
1153 /**
1154 * The Require: attribute is needed for proper streaming from
1155 * Realmedia servers.
1156 */
1157 av_strlcat(cmd,
1158 "Require: com.real.retain-entity-for-setup\r\n",
1159 sizeof(cmd));
1160 }
1161 rtsp_send_cmd(s, cmd, reply, &content);
1162 if (!content) {
1163 err = AVERROR_INVALIDDATA;
1164 goto fail;
1165 }
1166 if (reply->status_code != RTSP_STATUS_OK) {
1167 err = AVERROR_INVALIDDATA;
1168 goto fail;
1169 }
1170
1171 /* now we got the SDP description, we parse it */
1172 ret = sdp_parse(s, (const char *)content);
1173 av_freep(&content);
1174 if (ret < 0) {
1175 err = AVERROR_INVALIDDATA;
1176 goto fail;
1177 }
1178
1179 do {
1180 int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1181
1182 err = make_setup_request(s, host, port, lower_transport,
1183 rt->server_type == RTSP_SERVER_REAL ?
1184 real_challenge : NULL);
1185 if (err < 0)
1186 goto fail;
1187 lower_transport_mask &= ~(1 << lower_transport);
1188 if (lower_transport_mask == 0 && err == 1) {
1189 err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1190 goto fail;
1191 }
1192 } while (err);
1193
1194 rt->state = RTSP_STATE_IDLE;
1195 rt->seek_timestamp = 0; /* default is to start stream at position
1196 zero */
1197 if (ap->initial_pause) {
1198 /* do not start immediately */
1199 } else {
1200 if (rtsp_read_play(s) < 0) {
1201 err = AVERROR_INVALIDDATA;
1202 goto fail;
1203 }
1204 }
1205 return 0;
1206 fail:
1207 rtsp_close_streams(rt);
1208 av_freep(&content);
1209 url_close(rt->rtsp_hd);
1210 return err;
1211 }
1212
1213 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1214 uint8_t *buf, int buf_size)
1215 {
1216 RTSPState *rt = s->priv_data;
1217 int id, len, i, ret;
1218 RTSPStream *rtsp_st;
1219
1220 #ifdef DEBUG_RTP_TCP
1221 printf("tcp_read_packet:\n");
1222 #endif
1223 redo:
1224 for(;;) {
1225 ret = url_readbuf(rt->rtsp_hd, buf, 1);
1226 #ifdef DEBUG_RTP_TCP
1227 printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1228 #endif
1229 if (ret != 1)
1230 return -1;
1231 if (buf[0] == '$')
1232 break;
1233 }
1234 ret = url_readbuf(rt->rtsp_hd, buf, 3);
1235 if (ret != 3)
1236 return -1;
1237 id = buf[0];
1238 len = AV_RB16(buf + 1);
1239 #ifdef DEBUG_RTP_TCP
1240 printf("id=%d len=%d\n", id, len);
1241 #endif
1242 if (len > buf_size || len < 12)
1243 goto redo;
1244 /* get the data */
1245 ret = url_readbuf(rt->rtsp_hd, buf, len);
1246 if (ret != len)
1247 return -1;
1248 if (rt->transport == RTSP_TRANSPORT_RDT &&
1249 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1250 return -1;
1251
1252 /* find the matching stream */
1253 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1254 rtsp_st = rt->rtsp_streams[i];
1255 if (id >= rtsp_st->interleaved_min &&
1256 id <= rtsp_st->interleaved_max)
1257 goto found;
1258 }
1259 goto redo;
1260 found:
1261 *prtsp_st = rtsp_st;
1262 return len;
1263 }
1264
1265 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1266 uint8_t *buf, int buf_size)
1267 {
1268 RTSPState *rt = s->priv_data;
1269 RTSPStream *rtsp_st;
1270 fd_set rfds;
1271 int fd1, fd2, fd_max, n, i, ret;
1272 struct timeval tv;
1273
1274 for(;;) {
1275 if (url_interrupt_cb())
1276 return AVERROR(EINTR);
1277 FD_ZERO(&rfds);
1278 fd_max = -1;
1279 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1280 rtsp_st = rt->rtsp_streams[i];
1281 /* currently, we cannot probe RTCP handle because of blocking restrictions */
1282 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1283 if (fd1 > fd_max)
1284 fd_max = fd1;
1285 FD_SET(fd1, &rfds);
1286 }
1287 tv.tv_sec = 0;
1288 tv.tv_usec = 100 * 1000;
1289 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1290 if (n > 0) {
1291 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1292 rtsp_st = rt->rtsp_streams[i];
1293 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1294 if (FD_ISSET(fd1, &rfds)) {
1295 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1296 if (ret > 0) {
1297 *prtsp_st = rtsp_st;
1298 return ret;
1299 }
1300 }
1301 }
1302 }
1303 }
1304 }
1305
1306 static int rtsp_read_packet(AVFormatContext *s,
1307 AVPacket *pkt)
1308 {
1309 RTSPState *rt = s->priv_data;
1310 RTSPStream *rtsp_st;
1311 int ret, len;
1312 uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1313
1314 if (rt->server_type == RTSP_SERVER_REAL) {
1315 int i;
1316 RTSPMessageHeader reply1, *reply = &reply1;
1317 enum AVDiscard cache[MAX_STREAMS];
1318 char cmd[1024];
1319
1320 for (i = 0; i < s->nb_streams; i++)
1321 cache[i] = s->streams[i]->discard;
1322
1323 if (!rt->need_subscription) {
1324 if (memcmp (cache, rt->real_setup_cache,
1325 sizeof(enum AVDiscard) * s->nb_streams)) {
1326 av_strlcatf(cmd, sizeof(cmd),
1327 "SET_PARAMETER %s RTSP/1.0\r\n"
1328 "Unsubscribe: %s\r\n",
1329 s->filename, rt->last_subscription);
1330 rtsp_send_cmd(s, cmd, reply, NULL);
1331 if (reply->status_code != RTSP_STATUS_OK)
1332 return AVERROR_INVALIDDATA;
1333 rt->need_subscription = 1;
1334 }
1335 }
1336
1337 if (rt->need_subscription) {
1338 int r, rule_nr, first = 1;
1339
1340 memcpy(rt->real_setup_cache, cache,
1341 sizeof(enum AVDiscard) * s->nb_streams);
1342 rt->last_subscription[0] = 0;
1343
1344 snprintf(cmd, sizeof(cmd),
1345 "SET_PARAMETER %s RTSP/1.0\r\n"
1346 "Subscribe: ",
1347 s->filename);
1348 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1349 rule_nr = 0;
1350 for (r = 0; r < s->nb_streams; r++) {
1351 if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1352 if (s->streams[r]->discard != AVDISCARD_ALL) {
1353 if (!first)
1354 av_strlcat(rt->last_subscription, ",",
1355 sizeof(rt->last_subscription));
1356 ff_rdt_subscribe_rule(
1357 rt->last_subscription,
1358 sizeof(rt->last_subscription), i, rule_nr);
1359 first = 0;
1360 }
1361 rule_nr++;
1362 }
1363 }
1364 }
1365 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1366 rtsp_send_cmd(s, cmd, reply, NULL);
1367 if (reply->status_code != RTSP_STATUS_OK)
1368 return AVERROR_INVALIDDATA;
1369 rt->need_subscription = 0;
1370
1371 if (rt->state == RTSP_STATE_PLAYING)
1372 rtsp_read_play (s);
1373 }
1374 }
1375
1376 /* get next frames from the same RTP packet */
1377 if (rt->cur_transport_priv) {
1378 if (rt->transport == RTSP_TRANSPORT_RDT)
1379 ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1380 else
1381 ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1382 if (ret == 0) {
1383 rt->cur_transport_priv = NULL;
1384 return 0;
1385 } else if (ret == 1) {
1386 return 0;
1387 } else {
1388 rt->cur_transport_priv = NULL;
1389 }
1390 }
1391
1392 /* read next RTP packet */
1393 redo:
1394 switch(rt->lower_transport) {
1395 default:
1396 case RTSP_LOWER_TRANSPORT_TCP:
1397 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1398 break;
1399 case RTSP_LOWER_TRANSPORT_UDP:
1400 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1401 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1402 if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1403 rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1404 break;
1405 }
1406 if (len < 0)
1407 return len;
1408 if (rt->transport == RTSP_TRANSPORT_RDT)
1409 ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1410 else
1411 ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1412 if (ret < 0)
1413 goto redo;
1414 if (ret == 1) {
1415 /* more packets may follow, so we save the RTP context */
1416 rt->cur_transport_priv = rtsp_st->transport_priv;
1417 }
1418 return 0;
1419 }
1420
1421 static int rtsp_read_play(AVFormatContext *s)
1422 {
1423 RTSPState *rt = s->priv_data;
1424 RTSPMessageHeader reply1, *reply = &reply1;
1425 char cmd[1024];
1426
1427 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1428
1429 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1430 if (rt->state == RTSP_STATE_PAUSED) {
1431 snprintf(cmd, sizeof(cmd),
1432 "PLAY %s RTSP/1.0\r\n",
1433 s->filename);
1434 } else {
1435 snprintf(cmd, sizeof(cmd),
1436 "PLAY %s RTSP/1.0\r\n"
1437 "Range: npt=%0.3f-\r\n",
1438 s->filename,
1439 (double)rt->seek_timestamp / AV_TIME_BASE);
1440 }
1441 rtsp_send_cmd(s, cmd, reply, NULL);
1442 if (reply->status_code != RTSP_STATUS_OK) {
1443 return -1;
1444 }
1445 }
1446 rt->state = RTSP_STATE_PLAYING;
1447 return 0;
1448 }
1449
1450 /* pause the stream */
1451 static int rtsp_read_pause(AVFormatContext *s)
1452 {
1453 RTSPState *rt = s->priv_data;
1454 RTSPMessageHeader reply1, *reply = &reply1;
1455 char cmd[1024];
1456
1457 rt = s->priv_data;
1458
1459 if (rt->state != RTSP_STATE_PLAYING)
1460 return 0;
1461 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1462 snprintf(cmd, sizeof(cmd),
1463 "PAUSE %s RTSP/1.0\r\n",
1464 s->filename);
1465 rtsp_send_cmd(s, cmd, reply, NULL);
1466 if (reply->status_code != RTSP_STATUS_OK) {
1467 return -1;
1468 }
1469 }
1470 rt->state = RTSP_STATE_PAUSED;
1471 return 0;
1472 }
1473
1474 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1475 int64_t timestamp, int flags)
1476 {
1477 RTSPState *rt = s->priv_data;
1478
1479 rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1480 switch(rt->state) {
1481 default:
1482 case RTSP_STATE_IDLE:
1483 break;
1484 case RTSP_STATE_PLAYING:
1485 if (rtsp_read_play(s) != 0)
1486 return -1;
1487 break;
1488 case RTSP_STATE_PAUSED:
1489 rt->state = RTSP_STATE_IDLE;
1490 break;
1491 }
1492 return 0;
1493 }
1494
1495 static int rtsp_read_close(AVFormatContext *s)
1496 {
1497 RTSPState *rt = s->priv_data;
1498 RTSPMessageHeader reply1, *reply = &reply1;
1499 char cmd[1024];
1500
1501 #if 0
1502 /* NOTE: it is valid to flush the buffer here */
1503 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1504 url_fclose(&rt->rtsp_gb);
1505 }
1506 #endif
1507 snprintf(cmd, sizeof(cmd),
1508 "TEARDOWN %s RTSP/1.0\r\n",
1509 s->filename);
1510 rtsp_send_cmd(s, cmd, reply, NULL);
1511
1512 rtsp_close_streams(rt);
1513 url_close(rt->rtsp_hd);
1514 return 0;
1515 }
1516
1517 #if CONFIG_RTSP_DEMUXER
1518 AVInputFormat rtsp_demuxer = {
1519 "rtsp",
1520 NULL_IF_CONFIG_SMALL("RTSP input format"),
1521 sizeof(RTSPState),
1522 rtsp_probe,
1523 rtsp_read_header,
1524 rtsp_read_packet,
1525 rtsp_read_close,
1526 rtsp_read_seek,
1527 .flags = AVFMT_NOFILE,
1528 .read_play = rtsp_read_play,
1529 .read_pause = rtsp_read_pause,
1530 };
1531 #endif
1532
1533 static int sdp_probe(AVProbeData *p1)
1534 {
1535 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1536
1537 /* we look for a line beginning "c=IN IP4" */
1538 while (p < p_end && *p != '\0') {
1539 if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1540 return AVPROBE_SCORE_MAX / 2;
1541
1542 while(p < p_end - 1 && *p != '\n') p++;
1543 if (++p >= p_end)
1544 break;
1545 if (*p == '\r')
1546 p++;
1547 }
1548 return 0;
1549 }
1550
1551 #define SDP_MAX_SIZE 8192
1552
1553 static int sdp_read_header(AVFormatContext *s,
1554 AVFormatParameters *ap)
1555 {
1556 RTSPState *rt = s->priv_data;
1557 RTSPStream *rtsp_st;
1558 int size, i, err;
1559 char *content;
1560 char url[1024];
1561
1562 /* read the whole sdp file */
1563 /* XXX: better loading */
1564 content = av_malloc(SDP_MAX_SIZE);
1565 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1566 if (size <= 0) {
1567 av_free(content);
1568 return AVERROR_INVALIDDATA;
1569 }
1570 content[size] ='\0';
1571
1572 sdp_parse(s, content);
1573 av_free(content);
1574
1575 /* open each RTP stream */
1576 for(i=0;i<rt->nb_rtsp_streams;i++) {
1577 rtsp_st = rt->rtsp_streams[i];
1578
1579 snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1580 inet_ntoa(rtsp_st->sdp_ip),
1581 rtsp_st->sdp_port,
1582 rtsp_st->sdp_port,
1583 rtsp_st->sdp_ttl);
1584 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1585 err = AVERROR_INVALIDDATA;
1586 goto fail;
1587 }
1588 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1589 goto fail;
1590 }
1591 return 0;
1592 fail:
1593 rtsp_close_streams(rt);
1594 return err;
1595 }
1596
1597 static int sdp_read_packet(AVFormatContext *s,
1598 AVPacket *pkt)
1599 {
1600 return rtsp_read_packet(s, pkt);
1601 }
1602
1603 static int sdp_read_close(AVFormatContext *s)
1604 {
1605 RTSPState *rt = s->priv_data;
1606 rtsp_close_streams(rt);
1607 return 0;
1608 }
1609
1610 #if CONFIG_SDP_DEMUXER
1611 AVInputFormat sdp_demuxer = {
1612 "sdp",
1613 NULL_IF_CONFIG_SMALL("SDP"),
1614 sizeof(RTSPState),
1615 sdp_probe,
1616 sdp_read_header,
1617 sdp_read_packet,
1618 sdp_read_close,
1619 };
1620 #endif
1621
1622 #if CONFIG_REDIR_DEMUXER
1623 /* dummy redirector format (used directly in av_open_input_file now) */
1624 static int redir_probe(AVProbeData *pd)
1625 {
1626 const char *p;
1627 p = pd->buf;
1628 while (redir_isspace(*p))
1629 p++;
1630 if (av_strstart(p, "http://", NULL) ||
1631 av_strstart(p, "rtsp://", NULL))
1632 return AVPROBE_SCORE_MAX;
1633 return 0;
1634 }
1635
1636 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1637 {
1638 char buf[4096], *q;
1639 int c;
1640 AVFormatContext *ic = NULL;
1641 ByteIOContext *f = s->pb;
1642
1643 /* parse each URL and try to open it */
1644 c = url_fgetc(f);
1645 while (c != URL_EOF) {
1646 /* skip spaces */
1647 for(;;) {
1648 if (!redir_isspace(c))
1649 break;
1650 c = url_fgetc(f);
1651 }
1652 if (c == URL_EOF)
1653 break;
1654 /* record url */
1655 q = buf;
1656 for(;;) {
1657 if (c == URL_EOF || redir_isspace(c))
1658 break;
1659 if ((q - buf) < sizeof(buf) - 1)
1660 *q++ = c;
1661 c = url_fgetc(f);
1662 }
1663 *q = '\0';
1664 //printf("URL='%s'\n", buf);
1665 /* try to open the media file */
1666 if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1667 break;
1668 }
1669 if (!ic)
1670 return AVERROR(EIO);
1671
1672 *s = *ic;
1673 url_fclose(f);
1674
1675 return 0;
1676 }
1677
1678 AVInputFormat redir_demuxer = {
1679 "redir",
1680 NULL_IF_CONFIG_SMALL("Redirector format"),
1681 0,
1682 redir_probe,
1683 redir_read_header,
1684 NULL,
1685 NULL,
1686 };
1687 #endif