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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavformat / rtspdec.c
CommitLineData
2ba45a60
DM		 1/*
2 * RTSP demuxer
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#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
37static 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
55static 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
70static 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
95static 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, message, strlen(message));
118
119 return 0;
120}
121
122static 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
140static 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
170static 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
211static 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
229static 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 ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);
291 av_dlog(s, "Opening: %s", url);
292 ret = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
293 &s->interrupt_callback, NULL);
294 if (ret)
295 localport += 2;
296 } while (ret || localport > rt->rtp_port_max);
297 if (localport > rt->rtp_port_max) {
298 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
299 return ret;
300 }
301
302 av_dlog(s, "Listening on: %d",
303 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle));
304 if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
305 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
306 return ret;
307 }
308
309 localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
310 snprintf(responseheaders, sizeof(responseheaders), "Transport: "
311 "RTP/AVP/UDP;unicast;mode=receive;source=%s;"
312 "client_port=%d-%d;server_port=%d-%d\r\n",
313 host, request.transports[0].client_port_min,
314 request.transports[0].client_port_max, localport,
315 localport + 1);
316 }
317
318 /* Establish sessionid if not previously set */
319 /* Put this in a function? */
320 /* RFC 2326: session id must be at least 8 digits */
321 while (strlen(rt->session_id) < 8)
322 av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed());
323
324 av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
325 rt->session_id);
326 /* Send Reply */
327 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
328
329 rt->state = RTSP_STATE_PAUSED;
330 return 0;
331}
332
333static int rtsp_read_record(AVFormatContext *s)
334{
335 RTSPState *rt = s->priv_data;
336 RTSPMessageHeader request = { 0 };
337 int ret = 0;
338 char responseheaders[1024];
339
340 ret = rtsp_read_request(s, &request, "RECORD");
341 if (ret)
342 return ret;
343 ret = check_sessionid(s, &request);
344 if (ret)
345 return ret;
346 rt->seq++;
347 snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
348 rt->session_id);
349 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
350
351 rt->state = RTSP_STATE_STREAMING;
352 return 0;
353}
354
355static inline int parse_command_line(AVFormatContext *s, const char *line,
356 int linelen, char *uri, int urisize,
357 char *method, int methodsize,
358 enum RTSPMethod *methodcode)
359{
360 RTSPState *rt = s->priv_data;
361 const char *linept, *searchlinept;
362 linept = strchr(line, ' ');
363 if (!linept) {
364 av_log(s, AV_LOG_ERROR, "Error parsing method string\n");
365 return AVERROR_INVALIDDATA;
366 }
367 if (linept - line > methodsize - 1) {
368 av_log(s, AV_LOG_ERROR, "Method string too long\n");
369 return AVERROR(EIO);
370 }
371 memcpy(method, line, linept - line);
372 method[linept - line] = '\0';
373 linept++;
374 if (!strcmp(method, "ANNOUNCE"))
375 *methodcode = ANNOUNCE;
376 else if (!strcmp(method, "OPTIONS"))
377 *methodcode = OPTIONS;
378 else if (!strcmp(method, "RECORD"))
379 *methodcode = RECORD;
380 else if (!strcmp(method, "SETUP"))
381 *methodcode = SETUP;
382 else if (!strcmp(method, "PAUSE"))
383 *methodcode = PAUSE;
384 else if (!strcmp(method, "TEARDOWN"))
385 *methodcode = TEARDOWN;
386 else
387 *methodcode = UNKNOWN;
388 /* Check method with the state */
389 if (rt->state == RTSP_STATE_IDLE) {
390 if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) {
391 av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n",
392 line);
393 return AVERROR_PROTOCOL_NOT_FOUND;
394 }
395 } else if (rt->state == RTSP_STATE_PAUSED) {
396 if ((*methodcode != OPTIONS) && (*methodcode != RECORD)
397 && (*methodcode != SETUP)) {
398 av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n",
399 line);
400 return AVERROR_PROTOCOL_NOT_FOUND;
401 }
402 } else if (rt->state == RTSP_STATE_STREAMING) {
403 if ((*methodcode != PAUSE) && (*methodcode != OPTIONS)
404 && (*methodcode != TEARDOWN)) {
405 av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State"
406 " %s\n", line);
407 return AVERROR_PROTOCOL_NOT_FOUND;
408 }
409 } else {
410 av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state);
411 return AVERROR_BUG;
412 }
413
414 searchlinept = strchr(linept, ' ');
415 if (!searchlinept) {
416 av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
417 return AVERROR_INVALIDDATA;
418 }
419 if (searchlinept - linept > urisize - 1) {
420 av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n");
421 return AVERROR(EIO);
422 }
423 memcpy(uri, linept, searchlinept - linept);
424 uri[searchlinept - linept] = '\0';
425 if (strcmp(rt->control_uri, uri)) {
426 char host[128], path[512], auth[128];
427 int port;
428 char ctl_host[128], ctl_path[512], ctl_auth[128];
429 int ctl_port;
430 av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
431 path, sizeof(path), uri);
432 av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host,
433 sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path),
434 rt->control_uri);
435 if (strcmp(host, ctl_host))
436 av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n",
437 host, ctl_host);
438 if (strcmp(path, ctl_path) && *methodcode != SETUP)
439 av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected"
440 " %s\n", path, ctl_path);
441 if (*methodcode == ANNOUNCE) {
442 av_log(s, AV_LOG_INFO,
443 "Updating control URI to %s\n", uri);
444 av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri));
445 }
446 }
447
448 linept = searchlinept + 1;
449 if (!av_strstart(linept, "RTSP/1.0", NULL)) {
450 av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n");
451 return AVERROR_PROTOCOL_NOT_FOUND;
452 }
453 return 0;
454}
455
456int ff_rtsp_parse_streaming_commands(AVFormatContext *s)
457{
458 RTSPState *rt = s->priv_data;
459 unsigned char rbuf[4096];
460 unsigned char method[10];
461 char uri[500];
462 int ret;
463 int rbuflen = 0;
464 RTSPMessageHeader request = { 0 };
465 enum RTSPMethod methodcode;
466
467 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
468 if (ret < 0)
469 return ret;
470 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
471 sizeof(method), &methodcode);
472 if (ret) {
473 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
474 return ret;
475 }
476
477 ret = rtsp_read_request(s, &request, method);
478 if (ret)
479 return ret;
480 rt->seq++;
481 if (methodcode == PAUSE) {
482 rt->state = RTSP_STATE_PAUSED;
483 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
484 // TODO: Missing date header in response
485 } else if (methodcode == OPTIONS) {
486 ret = rtsp_send_reply(s, RTSP_STATUS_OK,
487 "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, "
488 "RECORD\r\n", request.seq);
489 } else if (methodcode == TEARDOWN) {
490 rt->state = RTSP_STATE_IDLE;
491 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
492 return 0;
493 }
494 return ret;
495}
496
497static int rtsp_read_play(AVFormatContext *s)
498{
499 RTSPState *rt = s->priv_data;
500 RTSPMessageHeader reply1, *reply = &reply1;
501 int i;
502 char cmd[1024];
503
504 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
505 rt->nb_byes = 0;
506
507 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
508 if (rt->transport == RTSP_TRANSPORT_RTP) {
509 for (i = 0; i < rt->nb_rtsp_streams; i++) {
510 RTSPStream *rtsp_st = rt->rtsp_streams[i];
511 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
512 if (!rtpctx)
513 continue;
514 ff_rtp_reset_packet_queue(rtpctx);
515 rtpctx->last_rtcp_ntp_time = AV_NOPTS_VALUE;
516 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
517 rtpctx->base_timestamp = 0;
518 rtpctx->timestamp = 0;
519 rtpctx->unwrapped_timestamp = 0;
520 rtpctx->rtcp_ts_offset = 0;
521 }
522 }
523 if (rt->state == RTSP_STATE_PAUSED) {
524 cmd[0] = 0;
525 } else {
526 snprintf(cmd, sizeof(cmd),
527 "Range: npt=%"PRId64".%03"PRId64"-\r\n",
528 rt->seek_timestamp / AV_TIME_BASE,
529 rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
530 }
531 ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
532 if (reply->status_code != RTSP_STATUS_OK) {
533 return -1;
534 }
535 if (rt->transport == RTSP_TRANSPORT_RTP &&
536 reply->range_start != AV_NOPTS_VALUE) {
537 for (i = 0; i < rt->nb_rtsp_streams; i++) {
538 RTSPStream *rtsp_st = rt->rtsp_streams[i];
539 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
540 AVStream *st = NULL;
541 if (!rtpctx || rtsp_st->stream_index < 0)
542 continue;
543 st = s->streams[rtsp_st->stream_index];
544 rtpctx->range_start_offset =
545 av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
546 st->time_base);
547 }
548 }
549 }
550 rt->state = RTSP_STATE_STREAMING;
551 return 0;
552}
553
554/* pause the stream */
555static int rtsp_read_pause(AVFormatContext *s)
556{
557 RTSPState *rt = s->priv_data;
558 RTSPMessageHeader reply1, *reply = &reply1;
559
560 if (rt->state != RTSP_STATE_STREAMING)
561 return 0;
562 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
563 ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
564 if (reply->status_code != RTSP_STATUS_OK) {
565 return -1;
566 }
567 }
568 rt->state = RTSP_STATE_PAUSED;
569 return 0;
570}
571
572int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
573{
574 RTSPState *rt = s->priv_data;
575 char cmd[1024];
576 unsigned char *content = NULL;
577 int ret;
578
579 /* describe the stream */
580 snprintf(cmd, sizeof(cmd),
581 "Accept: application/sdp\r\n");
582 if (rt->server_type == RTSP_SERVER_REAL) {
583 /**
584 * The Require: attribute is needed for proper streaming from
585 * Realmedia servers.
586 */
587 av_strlcat(cmd,
588 "Require: com.real.retain-entity-for-setup\r\n",
589 sizeof(cmd));
590 }
591 ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
592 if (!content)
593 return AVERROR_INVALIDDATA;
594 if (reply->status_code != RTSP_STATUS_OK) {
595 av_freep(&content);
596 return AVERROR_INVALIDDATA;
597 }
598
599 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
600 /* now we got the SDP description, we parse it */
601 ret = ff_sdp_parse(s, (const char *)content);
602 av_freep(&content);
603 if (ret < 0)
604 return ret;
605
606 return 0;
607}
608
609static int rtsp_listen(AVFormatContext *s)
610{
611 RTSPState *rt = s->priv_data;
612 char host[128], path[512], auth[128];
613 char uri[500];
614 int port;
615 char tcpname[500];
616 unsigned char rbuf[4096];
617 unsigned char method[10];
618 int rbuflen = 0;
619 int ret;
620 enum RTSPMethod methodcode;
621
622 /* extract hostname and port */
623 av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
624 path, sizeof(path), s->filename);
625
626 /* ff_url_join. No authorization by now (NULL) */
627 ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL, host,
628 port, "%s", path);
629
630 if (port < 0)
631 port = RTSP_DEFAULT_PORT;
632
633 /* Create TCP connection */
634 ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port,
635 "?listen&listen_timeout=%d", rt->initial_timeout * 1000);
636
637 if (ret = ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
638 &s->interrupt_callback, NULL)) {
639 av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n");
640 return ret;
641 }
642 rt->state = RTSP_STATE_IDLE;
643 rt->rtsp_hd_out = rt->rtsp_hd;
644 for (;;) { /* Wait for incoming RTSP messages */
645 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
646 if (ret < 0)
647 return ret;
648 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
649 sizeof(method), &methodcode);
650 if (ret) {
651 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
652 return ret;
653 }
654
655 if (methodcode == ANNOUNCE) {
656 ret = rtsp_read_announce(s);
657 rt->state = RTSP_STATE_PAUSED;
658 } else if (methodcode == OPTIONS) {
659 ret = rtsp_read_options(s);
660 } else if (methodcode == RECORD) {
661 ret = rtsp_read_record(s);
662 if (!ret)
663 return 0; // We are ready for streaming
664 } else if (methodcode == SETUP)
665 ret = rtsp_read_setup(s, host, uri);
666 if (ret) {
667 ffurl_close(rt->rtsp_hd);
668 return AVERROR_INVALIDDATA;
669 }
670 }
671 return 0;
672}
673
674static int rtsp_probe(AVProbeData *p)
675{
676 if (av_strstart(p->filename, "rtsp:", NULL))
677 return AVPROBE_SCORE_MAX;
678 return 0;
679}
680
681static int rtsp_read_header(AVFormatContext *s)
682{
683 RTSPState *rt = s->priv_data;
684 int ret;
685
686 if (rt->initial_timeout > 0)
687 rt->rtsp_flags |= RTSP_FLAG_LISTEN;
688
689 if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
690 ret = rtsp_listen(s);
691 if (ret)
692 return ret;
693 } else {
694 ret = ff_rtsp_connect(s);
695 if (ret)
696 return ret;
697
698 rt->real_setup_cache = !s->nb_streams ? NULL :
699 av_mallocz_array(s->nb_streams, 2 * sizeof(*rt->real_setup_cache));
700 if (!rt->real_setup_cache && s->nb_streams)
701 return AVERROR(ENOMEM);
702 rt->real_setup = rt->real_setup_cache + s->nb_streams;
703
704 if (rt->initial_pause) {
705 /* do not start immediately */
706 } else {
707 if (rtsp_read_play(s) < 0) {
708 ff_rtsp_close_streams(s);
709 ff_rtsp_close_connections(s);
710 return AVERROR_INVALIDDATA;
711 }
712 }
713 }
714
715 return 0;
716}
717
718int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
719 uint8_t *buf, int buf_size)
720{
721 RTSPState *rt = s->priv_data;
722 int id, len, i, ret;
723 RTSPStream *rtsp_st;
724
725 av_dlog(s, "tcp_read_packet:\n");
726redo:
727 for (;;) {
728 RTSPMessageHeader reply;
729
730 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
731 if (ret < 0)
732 return ret;
733 if (ret == 1) /* received '$' */
734 break;
735 /* XXX: parse message */
736 if (rt->state != RTSP_STATE_STREAMING)
737 return 0;
738 }
739 ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
740 if (ret != 3)
741 return -1;
742 id = buf[0];
743 len = AV_RB16(buf + 1);
744 av_dlog(s, "id=%d len=%d\n", id, len);
745 if (len > buf_size || len < 8)
746 goto redo;
747 /* get the data */
748 ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
749 if (ret != len)
750 return -1;
751 if (rt->transport == RTSP_TRANSPORT_RDT &&
752 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
753 return -1;
754
755 /* find the matching stream */
756 for (i = 0; i < rt->nb_rtsp_streams; i++) {
757 rtsp_st = rt->rtsp_streams[i];
758 if (id >= rtsp_st->interleaved_min &&
759 id <= rtsp_st->interleaved_max)
760 goto found;
761 }
762 goto redo;
763found:
764 *prtsp_st = rtsp_st;
765 return len;
766}
767
768static int resetup_tcp(AVFormatContext *s)
769{
770 RTSPState *rt = s->priv_data;
771 char host[1024];
772 int port;
773
774 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
775 s->filename);
776 ff_rtsp_undo_setup(s, 0);
777 return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
778 rt->real_challenge);
779}
780
781static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
782{
783 RTSPState *rt = s->priv_data;
784 int ret;
785 RTSPMessageHeader reply1, *reply = &reply1;
786 char cmd[1024];
787
788retry:
789 if (rt->server_type == RTSP_SERVER_REAL) {
790 int i;
791
792 for (i = 0; i < s->nb_streams; i++)
793 rt->real_setup[i] = s->streams[i]->discard;
794
795 if (!rt->need_subscription) {
796 if (memcmp (rt->real_setup, rt->real_setup_cache,
797 sizeof(enum AVDiscard) * s->nb_streams)) {
798 snprintf(cmd, sizeof(cmd),
799 "Unsubscribe: %s\r\n",
800 rt->last_subscription);
801 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
802 cmd, reply, NULL);
803 if (reply->status_code != RTSP_STATUS_OK)
804 return AVERROR_INVALIDDATA;
805 rt->need_subscription = 1;
806 }
807 }
808
809 if (rt->need_subscription) {
810 int r, rule_nr, first = 1;
811
812 memcpy(rt->real_setup_cache, rt->real_setup,
813 sizeof(enum AVDiscard) * s->nb_streams);
814 rt->last_subscription[0] = 0;
815
816 snprintf(cmd, sizeof(cmd),
817 "Subscribe: ");
818 for (i = 0; i < rt->nb_rtsp_streams; i++) {
819 rule_nr = 0;
820 for (r = 0; r < s->nb_streams; r++) {
821 if (s->streams[r]->id == i) {
822 if (s->streams[r]->discard != AVDISCARD_ALL) {
823 if (!first)
824 av_strlcat(rt->last_subscription, ",",
825 sizeof(rt->last_subscription));
826 ff_rdt_subscribe_rule(
827 rt->last_subscription,
828 sizeof(rt->last_subscription), i, rule_nr);
829 first = 0;
830 }
831 rule_nr++;
832 }
833 }
834 }
835 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
836 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
837 cmd, reply, NULL);
838 if (reply->status_code != RTSP_STATUS_OK)
839 return AVERROR_INVALIDDATA;
840 rt->need_subscription = 0;
841
842 if (rt->state == RTSP_STATE_STREAMING)
843 rtsp_read_play (s);
844 }
845 }
846
847 ret = ff_rtsp_fetch_packet(s, pkt);
848 if (ret < 0) {
849 if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
850 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
851 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
852 RTSPMessageHeader reply1, *reply = &reply1;
853 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
854 if (rtsp_read_pause(s) != 0)
855 return -1;
856 // TEARDOWN is required on Real-RTSP, but might make
857 // other servers close the connection.
858 if (rt->server_type == RTSP_SERVER_REAL)
859 ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
860 reply, NULL);
861 rt->session_id[0] = '\0';
862 if (resetup_tcp(s) == 0) {
863 rt->state = RTSP_STATE_IDLE;
864 rt->need_subscription = 1;
865 if (rtsp_read_play(s) != 0)
866 return -1;
867 goto retry;
868 }
869 }
870 }
871 return ret;
872 }
873 rt->packets++;
874
875 if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) {
876 /* send dummy request to keep TCP connection alive */
877 if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
878 rt->auth_state.stale) {
879 if (rt->server_type == RTSP_SERVER_WMS ||
880 (rt->server_type != RTSP_SERVER_REAL &&
881 rt->get_parameter_supported)) {
882 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
883 } else {
884 ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL);
885 }
886 /* The stale flag should be reset when creating the auth response in
887 * ff_rtsp_send_cmd_async, but reset it here just in case we never
888 * called the auth code (if we didn't have any credentials set). */
889 rt->auth_state.stale = 0;
890 }
891 }
892
893 return 0;
894}
895
896static int rtsp_read_seek(AVFormatContext *s, int stream_index,
897 int64_t timestamp, int flags)
898{
899 RTSPState *rt = s->priv_data;
900
901 rt->seek_timestamp = av_rescale_q(timestamp,
902 s->streams[stream_index]->time_base,
903 AV_TIME_BASE_Q);
904 switch(rt->state) {
905 default:
906 case RTSP_STATE_IDLE:
907 break;
908 case RTSP_STATE_STREAMING:
909 if (rtsp_read_pause(s) != 0)
910 return -1;
911 rt->state = RTSP_STATE_SEEKING;
912 if (rtsp_read_play(s) != 0)
913 return -1;
914 break;
915 case RTSP_STATE_PAUSED:
916 rt->state = RTSP_STATE_IDLE;
917 break;
918 }
919 return 0;
920}
921
922static const AVClass rtsp_demuxer_class = {
923 .class_name = "RTSP demuxer",
924 .item_name = av_default_item_name,
925 .option = ff_rtsp_options,
926 .version = LIBAVUTIL_VERSION_INT,
927};
928
929AVInputFormat ff_rtsp_demuxer = {
930 .name = "rtsp",
931 .long_name = NULL_IF_CONFIG_SMALL("RTSP input"),
932 .priv_data_size = sizeof(RTSPState),
933 .read_probe = rtsp_probe,
934 .read_header = rtsp_read_header,
935 .read_packet = rtsp_read_packet,
936 .read_close = rtsp_read_close,
937 .read_seek = rtsp_read_seek,
938 .flags = AVFMT_NOFILE,
939 .read_play = rtsp_read_play,
940 .read_pause = rtsp_read_pause,
941 .priv_class = &rtsp_demuxer_class,
942};
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