rtsp: Add a buffer_size option
[libav.git] / libavformat / rtspdec.c
1 /*
2 * RTSP demuxer
3 * Copyright (c) 2002 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/avstring.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/mathematics.h"
25 #include "libavutil/random_seed.h"
26 #include "libavutil/time.h"
27 #include "avformat.h"
28
29 #include "internal.h"
30 #include "network.h"
31 #include "os_support.h"
32 #include "rtpproto.h"
33 #include "rtsp.h"
34 #include "rdt.h"
35 #include "url.h"
36
37 static const struct RTSPStatusMessage {
38 enum RTSPStatusCode code;
39 const char *message;
40 } status_messages[] = {
41 { RTSP_STATUS_OK, "OK" },
42 { RTSP_STATUS_METHOD, "Method Not Allowed" },
43 { RTSP_STATUS_BANDWIDTH, "Not Enough Bandwidth" },
44 { RTSP_STATUS_SESSION, "Session Not Found" },
45 { RTSP_STATUS_STATE, "Method Not Valid in This State" },
46 { RTSP_STATUS_AGGREGATE, "Aggregate operation not allowed" },
47 { RTSP_STATUS_ONLY_AGGREGATE, "Only aggregate operation allowed" },
48 { RTSP_STATUS_TRANSPORT, "Unsupported transport" },
49 { RTSP_STATUS_INTERNAL, "Internal Server Error" },
50 { RTSP_STATUS_SERVICE, "Service Unavailable" },
51 { RTSP_STATUS_VERSION, "RTSP Version not supported" },
52 { 0, "NULL" }
53 };
54
55 static int rtsp_read_close(AVFormatContext *s)
56 {
57 RTSPState *rt = s->priv_data;
58
59 if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN))
60 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
61
62 ff_rtsp_close_streams(s);
63 ff_rtsp_close_connections(s);
64 ff_network_close();
65 rt->real_setup = NULL;
66 av_freep(&rt->real_setup_cache);
67 return 0;
68 }
69
70 static inline int read_line(AVFormatContext *s, char *rbuf, const int rbufsize,
71 int *rbuflen)
72 {
73 RTSPState *rt = s->priv_data;
74 int idx = 0;
75 int ret = 0;
76 *rbuflen = 0;
77
78 do {
79 ret = ffurl_read_complete(rt->rtsp_hd, rbuf + idx, 1);
80 if (ret <= 0)
81 return ret ? ret : AVERROR_EOF;
82 if (rbuf[idx] == '\r') {
83 /* Ignore */
84 } else if (rbuf[idx] == '\n') {
85 rbuf[idx] = '\0';
86 *rbuflen = idx;
87 return 0;
88 } else
89 idx++;
90 } while (idx < rbufsize);
91 av_log(s, AV_LOG_ERROR, "Message too long\n");
92 return AVERROR(EIO);
93 }
94
95 static int rtsp_send_reply(AVFormatContext *s, enum RTSPStatusCode code,
96 const char *extracontent, uint16_t seq)
97 {
98 RTSPState *rt = s->priv_data;
99 char message[4096];
100 int index = 0;
101 while (status_messages[index].code) {
102 if (status_messages[index].code == code) {
103 snprintf(message, sizeof(message), "RTSP/1.0 %d %s\r\n",
104 code, status_messages[index].message);
105 break;
106 }
107 index++;
108 }
109 if (!status_messages[index].code)
110 return AVERROR(EINVAL);
111 av_strlcatf(message, sizeof(message), "CSeq: %d\r\n", seq);
112 av_strlcatf(message, sizeof(message), "Server: %s\r\n", LIBAVFORMAT_IDENT);
113 if (extracontent)
114 av_strlcat(message, extracontent, sizeof(message));
115 av_strlcat(message, "\r\n", sizeof(message));
116 av_dlog(s, "Sending response:\n%s", message);
117 ffurl_write(rt->rtsp_hd_out, message, strlen(message));
118
119 return 0;
120 }
121
122 static inline int check_sessionid(AVFormatContext *s,
123 RTSPMessageHeader *request)
124 {
125 RTSPState *rt = s->priv_data;
126 unsigned char *session_id = rt->session_id;
127 if (!session_id[0]) {
128 av_log(s, AV_LOG_WARNING, "There is no session-id at the moment\n");
129 return 0;
130 }
131 if (strcmp(session_id, request->session_id)) {
132 av_log(s, AV_LOG_ERROR, "Unexpected session-id %s\n",
133 request->session_id);
134 rtsp_send_reply(s, RTSP_STATUS_SESSION, NULL, request->seq);
135 return AVERROR_STREAM_NOT_FOUND;
136 }
137 return 0;
138 }
139
140 static inline int rtsp_read_request(AVFormatContext *s,
141 RTSPMessageHeader *request,
142 const char *method)
143 {
144 RTSPState *rt = s->priv_data;
145 char rbuf[1024];
146 int rbuflen, ret;
147 do {
148 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
149 if (ret)
150 return ret;
151 if (rbuflen > 1) {
152 av_dlog(s, "Parsing[%d]: %s\n", rbuflen, rbuf);
153 ff_rtsp_parse_line(request, rbuf, rt, method);
154 }
155 } while (rbuflen > 0);
156 if (request->seq != rt->seq + 1) {
157 av_log(s, AV_LOG_ERROR, "Unexpected Sequence number %d\n",
158 request->seq);
159 return AVERROR(EINVAL);
160 }
161 if (rt->session_id[0] && strcmp(method, "OPTIONS")) {
162 ret = check_sessionid(s, request);
163 if (ret)
164 return ret;
165 }
166
167 return 0;
168 }
169
170 static int rtsp_read_announce(AVFormatContext *s)
171 {
172 RTSPState *rt = s->priv_data;
173 RTSPMessageHeader request = { 0 };
174 char sdp[4096];
175 int ret;
176
177 ret = rtsp_read_request(s, &request, "ANNOUNCE");
178 if (ret)
179 return ret;
180 rt->seq++;
181 if (strcmp(request.content_type, "application/sdp")) {
182 av_log(s, AV_LOG_ERROR, "Unexpected content type %s\n",
183 request.content_type);
184 rtsp_send_reply(s, RTSP_STATUS_SERVICE, NULL, request.seq);
185 return AVERROR_OPTION_NOT_FOUND;
186 }
187 if (request.content_length && request.content_length < sizeof(sdp) - 1) {
188 /* Read SDP */
189 if (ffurl_read_complete(rt->rtsp_hd, sdp, request.content_length)
190 < request.content_length) {
191 av_log(s, AV_LOG_ERROR,
192 "Unable to get complete SDP Description in ANNOUNCE\n");
193 rtsp_send_reply(s, RTSP_STATUS_INTERNAL, NULL, request.seq);
194 return AVERROR(EIO);
195 }
196 sdp[request.content_length] = '\0';
197 av_log(s, AV_LOG_VERBOSE, "SDP: %s\n", sdp);
198 ret = ff_sdp_parse(s, sdp);
199 if (ret)
200 return ret;
201 rtsp_send_reply(s, RTSP_STATUS_OK, NULL, request.seq);
202 return 0;
203 }
204 av_log(s, AV_LOG_ERROR,
205 "Content-Length header value exceeds sdp allocated buffer (4KB)\n");
206 rtsp_send_reply(s, RTSP_STATUS_INTERNAL,
207 "Content-Length exceeds buffer size", request.seq);
208 return AVERROR(EIO);
209 }
210
211 static int rtsp_read_options(AVFormatContext *s)
212 {
213 RTSPState *rt = s->priv_data;
214 RTSPMessageHeader request = { 0 };
215 int ret = 0;
216
217 /* Parsing headers */
218 ret = rtsp_read_request(s, &request, "OPTIONS");
219 if (ret)
220 return ret;
221 rt->seq++;
222 /* Send Reply */
223 rtsp_send_reply(s, RTSP_STATUS_OK,
224 "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, RECORD\r\n",
225 request.seq);
226 return 0;
227 }
228
229 static int rtsp_read_setup(AVFormatContext *s, char* host, char *controlurl)
230 {
231 RTSPState *rt = s->priv_data;
232 RTSPMessageHeader request = { 0 };
233 int ret = 0;
234 char url[1024];
235 RTSPStream *rtsp_st;
236 char responseheaders[1024];
237 int localport = -1;
238 int transportidx = 0;
239 int streamid = 0;
240
241 ret = rtsp_read_request(s, &request, "SETUP");
242 if (ret)
243 return ret;
244 rt->seq++;
245 if (!request.nb_transports) {
246 av_log(s, AV_LOG_ERROR, "No transport defined in SETUP\n");
247 return AVERROR_INVALIDDATA;
248 }
249 for (transportidx = 0; transportidx < request.nb_transports;
250 transportidx++) {
251 if (!request.transports[transportidx].mode_record ||
252 (request.transports[transportidx].lower_transport !=
253 RTSP_LOWER_TRANSPORT_UDP &&
254 request.transports[transportidx].lower_transport !=
255 RTSP_LOWER_TRANSPORT_TCP)) {
256 av_log(s, AV_LOG_ERROR, "mode=record/receive not set or transport"
257 " protocol not supported (yet)\n");
258 return AVERROR_INVALIDDATA;
259 }
260 }
261 if (request.nb_transports > 1)
262 av_log(s, AV_LOG_WARNING, "More than one transport not supported, "
263 "using first of all\n");
264 for (streamid = 0; streamid < rt->nb_rtsp_streams; streamid++) {
265 if (!strcmp(rt->rtsp_streams[streamid]->control_url,
266 controlurl))
267 break;
268 }
269 if (streamid == rt->nb_rtsp_streams) {
270 av_log(s, AV_LOG_ERROR, "Unable to find requested track\n");
271 return AVERROR_STREAM_NOT_FOUND;
272 }
273 rtsp_st = rt->rtsp_streams[streamid];
274 localport = rt->rtp_port_min;
275
276 if (request.transports[0].lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
277 rt->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
278 if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
279 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
280 return ret;
281 }
282 rtsp_st->interleaved_min = request.transports[0].interleaved_min;
283 rtsp_st->interleaved_max = request.transports[0].interleaved_max;
284 snprintf(responseheaders, sizeof(responseheaders), "Transport: "
285 "RTP/AVP/TCP;unicast;mode=receive;interleaved=%d-%d"
286 "\r\n", request.transports[0].interleaved_min,
287 request.transports[0].interleaved_max);
288 } else {
289 do {
290 AVDictionary *opts = NULL;
291 char buf[256];
292 snprintf(buf, sizeof(buf), "%d", rt->buffer_size);
293 av_dict_set(&opts, "buffer_size", buf, 0);
294 ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);
295 av_dlog(s, "Opening: %s", url);
296 ret = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
297 &s->interrupt_callback, &opts);
298 av_dict_free(&opts);
299 if (ret)
300 localport += 2;
301 } while (ret || localport > rt->rtp_port_max);
302 if (localport > rt->rtp_port_max) {
303 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
304 return ret;
305 }
306
307 av_dlog(s, "Listening on: %d",
308 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle));
309 if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
310 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
311 return ret;
312 }
313
314 localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
315 snprintf(responseheaders, sizeof(responseheaders), "Transport: "
316 "RTP/AVP/UDP;unicast;mode=receive;source=%s;"
317 "client_port=%d-%d;server_port=%d-%d\r\n",
318 host, request.transports[0].client_port_min,
319 request.transports[0].client_port_max, localport,
320 localport + 1);
321 }
322
323 /* Establish sessionid if not previously set */
324 /* Put this in a function? */
325 /* RFC 2326: session id must be at least 8 digits */
326 while (strlen(rt->session_id) < 8)
327 av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed());
328
329 av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
330 rt->session_id);
331 /* Send Reply */
332 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
333
334 rt->state = RTSP_STATE_PAUSED;
335 return 0;
336 }
337
338 static int rtsp_read_record(AVFormatContext *s)
339 {
340 RTSPState *rt = s->priv_data;
341 RTSPMessageHeader request = { 0 };
342 int ret = 0;
343 char responseheaders[1024];
344
345 ret = rtsp_read_request(s, &request, "RECORD");
346 if (ret)
347 return ret;
348 ret = check_sessionid(s, &request);
349 if (ret)
350 return ret;
351 rt->seq++;
352 snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
353 rt->session_id);
354 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
355
356 rt->state = RTSP_STATE_STREAMING;
357 return 0;
358 }
359
360 static inline int parse_command_line(AVFormatContext *s, const char *line,
361 int linelen, char *uri, int urisize,
362 char *method, int methodsize,
363 enum RTSPMethod *methodcode)
364 {
365 RTSPState *rt = s->priv_data;
366 const char *linept, *searchlinept;
367 linept = strchr(line, ' ');
368
369 if (!linept)
370 return AVERROR_INVALIDDATA;
371
372 if (linept - line > methodsize - 1) {
373 av_log(s, AV_LOG_ERROR, "Method string too long\n");
374 return AVERROR(EIO);
375 }
376 memcpy(method, line, linept - line);
377 method[linept - line] = '\0';
378 linept++;
379 if (!strcmp(method, "ANNOUNCE"))
380 *methodcode = ANNOUNCE;
381 else if (!strcmp(method, "OPTIONS"))
382 *methodcode = OPTIONS;
383 else if (!strcmp(method, "RECORD"))
384 *methodcode = RECORD;
385 else if (!strcmp(method, "SETUP"))
386 *methodcode = SETUP;
387 else if (!strcmp(method, "PAUSE"))
388 *methodcode = PAUSE;
389 else if (!strcmp(method, "TEARDOWN"))
390 *methodcode = TEARDOWN;
391 else
392 *methodcode = UNKNOWN;
393 /* Check method with the state */
394 if (rt->state == RTSP_STATE_IDLE) {
395 if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) {
396 av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n",
397 line);
398 return AVERROR_PROTOCOL_NOT_FOUND;
399 }
400 } else if (rt->state == RTSP_STATE_PAUSED) {
401 if ((*methodcode != OPTIONS) && (*methodcode != RECORD)
402 && (*methodcode != SETUP)) {
403 av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n",
404 line);
405 return AVERROR_PROTOCOL_NOT_FOUND;
406 }
407 } else if (rt->state == RTSP_STATE_STREAMING) {
408 if ((*methodcode != PAUSE) && (*methodcode != OPTIONS)
409 && (*methodcode != TEARDOWN)) {
410 av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State"
411 " %s\n", line);
412 return AVERROR_PROTOCOL_NOT_FOUND;
413 }
414 } else {
415 av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state);
416 return AVERROR_BUG;
417 }
418
419 searchlinept = strchr(linept, ' ');
420 if (!searchlinept) {
421 av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
422 return AVERROR_INVALIDDATA;
423 }
424 if (searchlinept - linept > urisize - 1) {
425 av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n");
426 return AVERROR(EIO);
427 }
428 memcpy(uri, linept, searchlinept - linept);
429 uri[searchlinept - linept] = '\0';
430 if (strcmp(rt->control_uri, uri)) {
431 char host[128], path[512], auth[128];
432 int port;
433 char ctl_host[128], ctl_path[512], ctl_auth[128];
434 int ctl_port;
435 av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
436 path, sizeof(path), uri);
437 av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host,
438 sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path),
439 rt->control_uri);
440 if (strcmp(host, ctl_host))
441 av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n",
442 host, ctl_host);
443 if (strcmp(path, ctl_path) && *methodcode != SETUP)
444 av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected"
445 " %s\n", path, ctl_path);
446 if (*methodcode == ANNOUNCE) {
447 av_log(s, AV_LOG_INFO,
448 "Updating control URI to %s\n", uri);
449 av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri));
450 }
451 }
452
453 linept = searchlinept + 1;
454 if (!av_strstart(linept, "RTSP/1.0", NULL)) {
455 av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n");
456 return AVERROR_PROTOCOL_NOT_FOUND;
457 }
458 return 0;
459 }
460
461 int ff_rtsp_parse_streaming_commands(AVFormatContext *s)
462 {
463 RTSPState *rt = s->priv_data;
464 unsigned char rbuf[4096];
465 unsigned char method[10];
466 char uri[500];
467 int ret;
468 int rbuflen = 0;
469 RTSPMessageHeader request = { 0 };
470 enum RTSPMethod methodcode;
471
472 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
473 if (ret < 0)
474 return ret;
475 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
476 sizeof(method), &methodcode);
477 if (ret) {
478 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
479 return ret;
480 }
481
482 ret = rtsp_read_request(s, &request, method);
483 if (ret)
484 return ret;
485 rt->seq++;
486 if (methodcode == PAUSE) {
487 rt->state = RTSP_STATE_PAUSED;
488 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
489 // TODO: Missing date header in response
490 } else if (methodcode == OPTIONS) {
491 ret = rtsp_send_reply(s, RTSP_STATUS_OK,
492 "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, "
493 "RECORD\r\n", request.seq);
494 } else if (methodcode == TEARDOWN) {
495 rt->state = RTSP_STATE_IDLE;
496 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
497 return 0;
498 }
499 return ret;
500 }
501
502 static int rtsp_read_play(AVFormatContext *s)
503 {
504 RTSPState *rt = s->priv_data;
505 RTSPMessageHeader reply1, *reply = &reply1;
506 int i;
507 char cmd[1024];
508
509 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
510 rt->nb_byes = 0;
511
512 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
513 for (i = 0; i < rt->nb_rtsp_streams; i++) {
514 RTSPStream *rtsp_st = rt->rtsp_streams[i];
515 /* Try to initialize the connection state in a
516 * potential NAT router by sending dummy packets.
517 * RTP/RTCP dummy packets are used for RDT, too.
518 */
519 if (rtsp_st->rtp_handle &&
520 !(rt->server_type == RTSP_SERVER_WMS && i > 1))
521 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);
522 }
523 }
524 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
525 if (rt->transport == RTSP_TRANSPORT_RTP) {
526 for (i = 0; i < rt->nb_rtsp_streams; i++) {
527 RTSPStream *rtsp_st = rt->rtsp_streams[i];
528 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
529 if (!rtpctx)
530 continue;
531 ff_rtp_reset_packet_queue(rtpctx);
532 rtpctx->last_rtcp_ntp_time = AV_NOPTS_VALUE;
533 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
534 rtpctx->base_timestamp = 0;
535 rtpctx->timestamp = 0;
536 rtpctx->unwrapped_timestamp = 0;
537 rtpctx->rtcp_ts_offset = 0;
538 }
539 }
540 if (rt->state == RTSP_STATE_PAUSED) {
541 cmd[0] = 0;
542 } else {
543 snprintf(cmd, sizeof(cmd),
544 "Range: npt=%"PRId64".%03"PRId64"-\r\n",
545 rt->seek_timestamp / AV_TIME_BASE,
546 rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
547 }
548 ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
549 if (reply->status_code != RTSP_STATUS_OK) {
550 return -1;
551 }
552 if (rt->transport == RTSP_TRANSPORT_RTP &&
553 reply->range_start != AV_NOPTS_VALUE) {
554 for (i = 0; i < rt->nb_rtsp_streams; i++) {
555 RTSPStream *rtsp_st = rt->rtsp_streams[i];
556 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
557 AVStream *st = NULL;
558 if (!rtpctx || rtsp_st->stream_index < 0)
559 continue;
560 st = s->streams[rtsp_st->stream_index];
561 rtpctx->range_start_offset =
562 av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
563 st->time_base);
564 }
565 }
566 }
567 rt->state = RTSP_STATE_STREAMING;
568 return 0;
569 }
570
571 /* pause the stream */
572 static int rtsp_read_pause(AVFormatContext *s)
573 {
574 RTSPState *rt = s->priv_data;
575 RTSPMessageHeader reply1, *reply = &reply1;
576
577 if (rt->state != RTSP_STATE_STREAMING)
578 return 0;
579 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
580 ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
581 if (reply->status_code != RTSP_STATUS_OK) {
582 return -1;
583 }
584 }
585 rt->state = RTSP_STATE_PAUSED;
586 return 0;
587 }
588
589 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
590 {
591 RTSPState *rt = s->priv_data;
592 char cmd[1024];
593 unsigned char *content = NULL;
594 int ret;
595
596 /* describe the stream */
597 snprintf(cmd, sizeof(cmd),
598 "Accept: application/sdp\r\n");
599 if (rt->server_type == RTSP_SERVER_REAL) {
600 /**
601 * The Require: attribute is needed for proper streaming from
602 * Realmedia servers.
603 */
604 av_strlcat(cmd,
605 "Require: com.real.retain-entity-for-setup\r\n",
606 sizeof(cmd));
607 }
608 ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
609 if (!content)
610 return AVERROR_INVALIDDATA;
611 if (reply->status_code != RTSP_STATUS_OK) {
612 av_freep(&content);
613 return AVERROR_INVALIDDATA;
614 }
615
616 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
617 /* now we got the SDP description, we parse it */
618 ret = ff_sdp_parse(s, (const char *)content);
619 av_freep(&content);
620 if (ret < 0)
621 return ret;
622
623 return 0;
624 }
625
626 static int rtsp_listen(AVFormatContext *s)
627 {
628 RTSPState *rt = s->priv_data;
629 char proto[128], host[128], path[512], auth[128];
630 char uri[500];
631 int port;
632 int default_port = RTSP_DEFAULT_PORT;
633 char tcpname[500];
634 const char *lower_proto = "tcp";
635 unsigned char rbuf[4096];
636 unsigned char method[10];
637 int rbuflen = 0;
638 int ret;
639 enum RTSPMethod methodcode;
640
641 /* extract hostname and port */
642 av_url_split(proto, sizeof(proto), auth, sizeof(auth), host, sizeof(host),
643 &port, path, sizeof(path), s->filename);
644
645 /* ff_url_join. No authorization by now (NULL) */
646 ff_url_join(rt->control_uri, sizeof(rt->control_uri), proto, NULL, host,
647 port, "%s", path);
648
649 if (!strcmp(proto, "rtsps")) {
650 lower_proto = "tls";
651 default_port = RTSPS_DEFAULT_PORT;
652 }
653
654 if (port < 0)
655 port = default_port;
656
657 /* Create TCP connection */
658 ff_url_join(tcpname, sizeof(tcpname), lower_proto, NULL, host, port,
659 "?listen&listen_timeout=%d", rt->initial_timeout * 1000);
660
661 if (ret = ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
662 &s->interrupt_callback, NULL)) {
663 av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n");
664 return ret;
665 }
666 rt->state = RTSP_STATE_IDLE;
667 rt->rtsp_hd_out = rt->rtsp_hd;
668 for (;;) { /* Wait for incoming RTSP messages */
669 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
670 if (ret < 0)
671 return ret;
672 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
673 sizeof(method), &methodcode);
674 if (ret) {
675 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
676 return ret;
677 }
678
679 if (methodcode == ANNOUNCE) {
680 ret = rtsp_read_announce(s);
681 rt->state = RTSP_STATE_PAUSED;
682 } else if (methodcode == OPTIONS) {
683 ret = rtsp_read_options(s);
684 } else if (methodcode == RECORD) {
685 ret = rtsp_read_record(s);
686 if (!ret)
687 return 0; // We are ready for streaming
688 } else if (methodcode == SETUP)
689 ret = rtsp_read_setup(s, host, uri);
690 if (ret) {
691 ffurl_close(rt->rtsp_hd);
692 return AVERROR_INVALIDDATA;
693 }
694 }
695 return 0;
696 }
697
698 static int rtsp_probe(AVProbeData *p)
699 {
700 if (
701 #if CONFIG_TLS_PROTOCOL
702 av_strstart(p->filename, "rtsps:", NULL) ||
703 #endif
704 av_strstart(p->filename, "rtsp:", NULL))
705 return AVPROBE_SCORE_MAX;
706 return 0;
707 }
708
709 static int rtsp_read_header(AVFormatContext *s)
710 {
711 RTSPState *rt = s->priv_data;
712 int ret;
713
714 if (rt->initial_timeout > 0)
715 rt->rtsp_flags |= RTSP_FLAG_LISTEN;
716
717 if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
718 ret = rtsp_listen(s);
719 if (ret)
720 return ret;
721 } else {
722 ret = ff_rtsp_connect(s);
723 if (ret)
724 return ret;
725
726 rt->real_setup_cache = !s->nb_streams ? NULL :
727 av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
728 if (!rt->real_setup_cache && s->nb_streams)
729 return AVERROR(ENOMEM);
730 rt->real_setup = rt->real_setup_cache + s->nb_streams;
731
732 if (rt->initial_pause) {
733 /* do not start immediately */
734 } else {
735 if (rtsp_read_play(s) < 0) {
736 ff_rtsp_close_streams(s);
737 ff_rtsp_close_connections(s);
738 return AVERROR_INVALIDDATA;
739 }
740 }
741 }
742
743 return 0;
744 }
745
746 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
747 uint8_t *buf, int buf_size)
748 {
749 RTSPState *rt = s->priv_data;
750 int id, len, i, ret;
751 RTSPStream *rtsp_st;
752
753 av_dlog(s, "tcp_read_packet:\n");
754 redo:
755 for (;;) {
756 RTSPMessageHeader reply;
757
758 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
759 if (ret < 0)
760 return ret;
761 if (ret == 1) /* received '$' */
762 break;
763 /* XXX: parse message */
764 if (rt->state != RTSP_STATE_STREAMING)
765 return 0;
766 }
767 ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
768 if (ret != 3)
769 return -1;
770 id = buf[0];
771 len = AV_RB16(buf + 1);
772 av_dlog(s, "id=%d len=%d\n", id, len);
773 if (len > buf_size || len < 12)
774 goto redo;
775 /* get the data */
776 ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
777 if (ret != len)
778 return -1;
779 if (rt->transport == RTSP_TRANSPORT_RDT &&
780 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
781 return -1;
782
783 /* find the matching stream */
784 for (i = 0; i < rt->nb_rtsp_streams; i++) {
785 rtsp_st = rt->rtsp_streams[i];
786 if (id >= rtsp_st->interleaved_min &&
787 id <= rtsp_st->interleaved_max)
788 goto found;
789 }
790 goto redo;
791 found:
792 *prtsp_st = rtsp_st;
793 return len;
794 }
795
796 static int resetup_tcp(AVFormatContext *s)
797 {
798 RTSPState *rt = s->priv_data;
799 char host[1024];
800 int port;
801
802 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
803 s->filename);
804 ff_rtsp_undo_setup(s, 0);
805 return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
806 rt->real_challenge);
807 }
808
809 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
810 {
811 RTSPState *rt = s->priv_data;
812 int ret;
813 RTSPMessageHeader reply1, *reply = &reply1;
814 char cmd[1024];
815
816 retry:
817 if (rt->server_type == RTSP_SERVER_REAL) {
818 int i;
819
820 for (i = 0; i < s->nb_streams; i++)
821 rt->real_setup[i] = s->streams[i]->discard;
822
823 if (!rt->need_subscription) {
824 if (memcmp (rt->real_setup, rt->real_setup_cache,
825 sizeof(enum AVDiscard) * s->nb_streams)) {
826 snprintf(cmd, sizeof(cmd),
827 "Unsubscribe: %s\r\n",
828 rt->last_subscription);
829 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
830 cmd, reply, NULL);
831 if (reply->status_code != RTSP_STATUS_OK)
832 return AVERROR_INVALIDDATA;
833 rt->need_subscription = 1;
834 }
835 }
836
837 if (rt->need_subscription) {
838 int r, rule_nr, first = 1;
839
840 memcpy(rt->real_setup_cache, rt->real_setup,
841 sizeof(enum AVDiscard) * s->nb_streams);
842 rt->last_subscription[0] = 0;
843
844 snprintf(cmd, sizeof(cmd),
845 "Subscribe: ");
846 for (i = 0; i < rt->nb_rtsp_streams; i++) {
847 rule_nr = 0;
848 for (r = 0; r < s->nb_streams; r++) {
849 if (s->streams[r]->id == i) {
850 if (s->streams[r]->discard != AVDISCARD_ALL) {
851 if (!first)
852 av_strlcat(rt->last_subscription, ",",
853 sizeof(rt->last_subscription));
854 ff_rdt_subscribe_rule(
855 rt->last_subscription,
856 sizeof(rt->last_subscription), i, rule_nr);
857 first = 0;
858 }
859 rule_nr++;
860 }
861 }
862 }
863 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
864 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
865 cmd, reply, NULL);
866 if (reply->status_code != RTSP_STATUS_OK)
867 return AVERROR_INVALIDDATA;
868 rt->need_subscription = 0;
869
870 if (rt->state == RTSP_STATE_STREAMING)
871 rtsp_read_play (s);
872 }
873 }
874
875 ret = ff_rtsp_fetch_packet(s, pkt);
876 if (ret < 0) {
877 if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
878 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
879 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
880 RTSPMessageHeader reply1, *reply = &reply1;
881 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
882 if (rtsp_read_pause(s) != 0)
883 return -1;
884 // TEARDOWN is required on Real-RTSP, but might make
885 // other servers close the connection.
886 if (rt->server_type == RTSP_SERVER_REAL)
887 ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
888 reply, NULL);
889 rt->session_id[0] = '\0';
890 if (resetup_tcp(s) == 0) {
891 rt->state = RTSP_STATE_IDLE;
892 rt->need_subscription = 1;
893 if (rtsp_read_play(s) != 0)
894 return -1;
895 goto retry;
896 }
897 }
898 }
899 return ret;
900 }
901 rt->packets++;
902
903 if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) {
904 /* send dummy request to keep TCP connection alive */
905 if ((av_gettime_relative() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
906 rt->auth_state.stale) {
907 if (rt->server_type == RTSP_SERVER_WMS ||
908 (rt->server_type != RTSP_SERVER_REAL &&
909 rt->get_parameter_supported)) {
910 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
911 } else {
912 ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL);
913 }
914 /* The stale flag should be reset when creating the auth response in
915 * ff_rtsp_send_cmd_async, but reset it here just in case we never
916 * called the auth code (if we didn't have any credentials set). */
917 rt->auth_state.stale = 0;
918 }
919 }
920
921 return 0;
922 }
923
924 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
925 int64_t timestamp, int flags)
926 {
927 RTSPState *rt = s->priv_data;
928
929 rt->seek_timestamp = av_rescale_q(timestamp,
930 s->streams[stream_index]->time_base,
931 AV_TIME_BASE_Q);
932 switch(rt->state) {
933 default:
934 case RTSP_STATE_IDLE:
935 break;
936 case RTSP_STATE_STREAMING:
937 if (rtsp_read_pause(s) != 0)
938 return -1;
939 rt->state = RTSP_STATE_SEEKING;
940 if (rtsp_read_play(s) != 0)
941 return -1;
942 break;
943 case RTSP_STATE_PAUSED:
944 rt->state = RTSP_STATE_IDLE;
945 break;
946 }
947 return 0;
948 }
949
950 static const AVClass rtsp_demuxer_class = {
951 .class_name = "RTSP demuxer",
952 .item_name = av_default_item_name,
953 .option = ff_rtsp_options,
954 .version = LIBAVUTIL_VERSION_INT,
955 };
956
957 AVInputFormat ff_rtsp_demuxer = {
958 .name = "rtsp",
959 .long_name = NULL_IF_CONFIG_SMALL("RTSP input"),
960 .priv_data_size = sizeof(RTSPState),
961 .read_probe = rtsp_probe,
962 .read_header = rtsp_read_header,
963 .read_packet = rtsp_read_packet,
964 .read_close = rtsp_read_close,
965 .read_seek = rtsp_read_seek,
966 .flags = AVFMT_NOFILE,
967 .read_play = rtsp_read_play,
968 .read_pause = rtsp_read_pause,
969 .priv_class = &rtsp_demuxer_class,
970 };