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 "tls.h"
36 #include "url.h"
37
38 static const struct RTSPStatusMessage {
39 enum RTSPStatusCode code;
40 const char *message;
41 } status_messages[] = {
42 { RTSP_STATUS_OK, "OK" },
43 { RTSP_STATUS_METHOD, "Method Not Allowed" },
44 { RTSP_STATUS_BANDWIDTH, "Not Enough Bandwidth" },
45 { RTSP_STATUS_SESSION, "Session Not Found" },
46 { RTSP_STATUS_STATE, "Method Not Valid in This State" },
47 { RTSP_STATUS_AGGREGATE, "Aggregate operation not allowed" },
48 { RTSP_STATUS_ONLY_AGGREGATE, "Only aggregate operation allowed" },
49 { RTSP_STATUS_TRANSPORT, "Unsupported transport" },
50 { RTSP_STATUS_INTERNAL, "Internal Server Error" },
51 { RTSP_STATUS_SERVICE, "Service Unavailable" },
52 { RTSP_STATUS_VERSION, "RTSP Version not supported" },
53 { 0, "NULL" }
54 };
55
rtsp_read_close(AVFormatContext * s)56 static int rtsp_read_close(AVFormatContext *s)
57 {
58 RTSPState *rt = s->priv_data;
59
60 if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN))
61 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
62
63 ff_rtsp_close_streams(s);
64 ff_rtsp_close_connections(s);
65 ff_network_close();
66 rt->real_setup = NULL;
67 av_freep(&rt->real_setup_cache);
68 return 0;
69 }
70
read_line(AVFormatContext * s,char * rbuf,const int rbufsize,int * rbuflen)71 static inline int read_line(AVFormatContext *s, char *rbuf, const int rbufsize,
72 int *rbuflen)
73 {
74 RTSPState *rt = s->priv_data;
75 int idx = 0;
76 int ret = 0;
77 *rbuflen = 0;
78
79 do {
80 ret = ffurl_read_complete(rt->rtsp_hd, rbuf + idx, 1);
81 if (ret <= 0)
82 return ret ? ret : AVERROR_EOF;
83 if (rbuf[idx] == '\r') {
84 /* Ignore */
85 } else if (rbuf[idx] == '\n') {
86 rbuf[idx] = '\0';
87 *rbuflen = idx;
88 return 0;
89 } else
90 idx++;
91 } while (idx < rbufsize);
92 av_log(s, AV_LOG_ERROR, "Message too long\n");
93 return AVERROR(EIO);
94 }
95
rtsp_send_reply(AVFormatContext * s,enum RTSPStatusCode code,const char * extracontent,uint16_t seq)96 static int rtsp_send_reply(AVFormatContext *s, enum RTSPStatusCode code,
97 const char *extracontent, uint16_t seq)
98 {
99 RTSPState *rt = s->priv_data;
100 char message[MAX_URL_SIZE];
101 int index = 0;
102 while (status_messages[index].code) {
103 if (status_messages[index].code == code) {
104 snprintf(message, sizeof(message), "RTSP/1.0 %d %s\r\n",
105 code, status_messages[index].message);
106 break;
107 }
108 index++;
109 }
110 if (!status_messages[index].code)
111 return AVERROR(EINVAL);
112 av_strlcatf(message, sizeof(message), "CSeq: %d\r\n", seq);
113 av_strlcatf(message, sizeof(message), "Server: %s\r\n", LIBAVFORMAT_IDENT);
114 if (extracontent)
115 av_strlcat(message, extracontent, sizeof(message));
116 av_strlcat(message, "\r\n", sizeof(message));
117 av_log(s, AV_LOG_TRACE, "Sending response:\n%s", message);
118 ffurl_write(rt->rtsp_hd_out, message, strlen(message));
119
120 return 0;
121 }
122
check_sessionid(AVFormatContext * s,RTSPMessageHeader * request)123 static inline int check_sessionid(AVFormatContext *s,
124 RTSPMessageHeader *request)
125 {
126 RTSPState *rt = s->priv_data;
127 unsigned char *session_id = rt->session_id;
128 if (!session_id[0]) {
129 av_log(s, AV_LOG_WARNING, "There is no session-id at the moment\n");
130 return 0;
131 }
132 if (strcmp(session_id, request->session_id)) {
133 av_log(s, AV_LOG_ERROR, "Unexpected session-id %s\n",
134 request->session_id);
135 rtsp_send_reply(s, RTSP_STATUS_SESSION, NULL, request->seq);
136 return AVERROR_STREAM_NOT_FOUND;
137 }
138 return 0;
139 }
140
rtsp_read_request(AVFormatContext * s,RTSPMessageHeader * request,const char * method)141 static inline int rtsp_read_request(AVFormatContext *s,
142 RTSPMessageHeader *request,
143 const char *method)
144 {
145 RTSPState *rt = s->priv_data;
146 char rbuf[MAX_URL_SIZE];
147 int rbuflen, ret;
148 do {
149 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
150 if (ret)
151 return ret;
152 if (rbuflen > 1) {
153 av_log(s, AV_LOG_TRACE, "Parsing[%d]: %s\n", rbuflen, rbuf);
154 ff_rtsp_parse_line(s, request, rbuf, rt, method);
155 }
156 } while (rbuflen > 0);
157 if (request->seq != rt->seq + 1) {
158 av_log(s, AV_LOG_ERROR, "Unexpected Sequence number %d\n",
159 request->seq);
160 return AVERROR(EINVAL);
161 }
162 if (rt->session_id[0] && strcmp(method, "OPTIONS")) {
163 ret = check_sessionid(s, request);
164 if (ret)
165 return ret;
166 }
167
168 return 0;
169 }
170
rtsp_read_announce(AVFormatContext * s)171 static int rtsp_read_announce(AVFormatContext *s)
172 {
173 RTSPState *rt = s->priv_data;
174 RTSPMessageHeader request = { 0 };
175 char sdp[SDP_MAX_SIZE];
176 int ret;
177
178 ret = rtsp_read_request(s, &request, "ANNOUNCE");
179 if (ret)
180 return ret;
181 rt->seq++;
182 if (strcmp(request.content_type, "application/sdp")) {
183 av_log(s, AV_LOG_ERROR, "Unexpected content type %s\n",
184 request.content_type);
185 rtsp_send_reply(s, RTSP_STATUS_SERVICE, NULL, request.seq);
186 return AVERROR_OPTION_NOT_FOUND;
187 }
188 if (request.content_length && request.content_length < sizeof(sdp) - 1) {
189 /* Read SDP */
190 if (ffurl_read_complete(rt->rtsp_hd, sdp, request.content_length)
191 < request.content_length) {
192 av_log(s, AV_LOG_ERROR,
193 "Unable to get complete SDP Description in ANNOUNCE\n");
194 rtsp_send_reply(s, RTSP_STATUS_INTERNAL, NULL, request.seq);
195 return AVERROR(EIO);
196 }
197 sdp[request.content_length] = '\0';
198 av_log(s, AV_LOG_VERBOSE, "SDP: %s\n", sdp);
199 ret = ff_sdp_parse(s, sdp);
200 if (ret)
201 return ret;
202 rtsp_send_reply(s, RTSP_STATUS_OK, NULL, request.seq);
203 return 0;
204 }
205 av_log(s, AV_LOG_ERROR,
206 "Content-Length header value exceeds sdp allocated buffer (4KB)\n");
207 rtsp_send_reply(s, RTSP_STATUS_INTERNAL,
208 "Content-Length exceeds buffer size", request.seq);
209 return AVERROR(EIO);
210 }
211
rtsp_read_options(AVFormatContext * s)212 static int rtsp_read_options(AVFormatContext *s)
213 {
214 RTSPState *rt = s->priv_data;
215 RTSPMessageHeader request = { 0 };
216 int ret = 0;
217
218 /* Parsing headers */
219 ret = rtsp_read_request(s, &request, "OPTIONS");
220 if (ret)
221 return ret;
222 rt->seq++;
223 /* Send Reply */
224 rtsp_send_reply(s, RTSP_STATUS_OK,
225 "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, RECORD\r\n",
226 request.seq);
227 return 0;
228 }
229
rtsp_read_setup(AVFormatContext * s,char * host,char * controlurl)230 static int rtsp_read_setup(AVFormatContext *s, char* host, char *controlurl)
231 {
232 RTSPState *rt = s->priv_data;
233 RTSPMessageHeader request = { 0 };
234 int ret = 0;
235 char url[MAX_URL_SIZE];
236 RTSPStream *rtsp_st;
237 char responseheaders[MAX_URL_SIZE];
238 int localport = -1;
239 int transportidx = 0;
240 int streamid = 0;
241
242 ret = rtsp_read_request(s, &request, "SETUP");
243 if (ret)
244 return ret;
245 rt->seq++;
246 if (!request.nb_transports) {
247 av_log(s, AV_LOG_ERROR, "No transport defined in SETUP\n");
248 return AVERROR_INVALIDDATA;
249 }
250 for (transportidx = 0; transportidx < request.nb_transports;
251 transportidx++) {
252 if (!request.transports[transportidx].mode_record ||
253 (request.transports[transportidx].lower_transport !=
254 RTSP_LOWER_TRANSPORT_UDP &&
255 request.transports[transportidx].lower_transport !=
256 RTSP_LOWER_TRANSPORT_TCP)) {
257 av_log(s, AV_LOG_ERROR, "mode=record/receive not set or transport"
258 " protocol not supported (yet)\n");
259 return AVERROR_INVALIDDATA;
260 }
261 }
262 if (request.nb_transports > 1)
263 av_log(s, AV_LOG_WARNING, "More than one transport not supported, "
264 "using first of all\n");
265 for (streamid = 0; streamid < rt->nb_rtsp_streams; streamid++) {
266 if (!strcmp(rt->rtsp_streams[streamid]->control_url,
267 controlurl))
268 break;
269 }
270 if (streamid == rt->nb_rtsp_streams) {
271 av_log(s, AV_LOG_ERROR, "Unable to find requested track\n");
272 return AVERROR_STREAM_NOT_FOUND;
273 }
274 rtsp_st = rt->rtsp_streams[streamid];
275 localport = rt->rtp_port_min;
276
277 /* check if the stream has already been setup */
278 if (rtsp_st->transport_priv) {
279 if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RDT)
280 ff_rdt_parse_close(rtsp_st->transport_priv);
281 else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RTP)
282 ff_rtp_parse_close(rtsp_st->transport_priv);
283 rtsp_st->transport_priv = NULL;
284 }
285 if (rtsp_st->rtp_handle)
286 ffurl_closep(&rtsp_st->rtp_handle);
287
288 if (request.transports[0].lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
289 rt->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
290 if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
291 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
292 return ret;
293 }
294 rtsp_st->interleaved_min = request.transports[0].interleaved_min;
295 rtsp_st->interleaved_max = request.transports[0].interleaved_max;
296 snprintf(responseheaders, sizeof(responseheaders), "Transport: "
297 "RTP/AVP/TCP;unicast;mode=receive;interleaved=%d-%d"
298 "\r\n", request.transports[0].interleaved_min,
299 request.transports[0].interleaved_max);
300 } else {
301 do {
302 AVDictionary *opts = NULL;
303 av_dict_set_int(&opts, "buffer_size", rt->buffer_size, 0);
304 ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);
305 av_log(s, AV_LOG_TRACE, "Opening: %s\n", url);
306 ret = ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
307 &s->interrupt_callback, &opts,
308 s->protocol_whitelist, s->protocol_blacklist, NULL);
309 av_dict_free(&opts);
310 if (ret)
311 localport += 2;
312 } while (ret || localport > rt->rtp_port_max);
313 if (localport > rt->rtp_port_max) {
314 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
315 return ret;
316 }
317
318 av_log(s, AV_LOG_TRACE, "Listening on: %d\n",
319 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle));
320 if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
321 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
322 return ret;
323 }
324
325 localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
326 snprintf(responseheaders, sizeof(responseheaders), "Transport: "
327 "RTP/AVP/UDP;unicast;mode=receive;source=%s;"
328 "client_port=%d-%d;server_port=%d-%d\r\n",
329 host, request.transports[0].client_port_min,
330 request.transports[0].client_port_max, localport,
331 localport + 1);
332 }
333
334 /* Establish sessionid if not previously set */
335 /* Put this in a function? */
336 /* RFC 2326: session id must be at least 8 digits */
337 while (strlen(rt->session_id) < 8)
338 av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed());
339
340 av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
341 rt->session_id);
342 /* Send Reply */
343 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
344
345 rt->state = RTSP_STATE_PAUSED;
346 return 0;
347 }
348
rtsp_read_record(AVFormatContext * s)349 static int rtsp_read_record(AVFormatContext *s)
350 {
351 RTSPState *rt = s->priv_data;
352 RTSPMessageHeader request = { 0 };
353 int ret = 0;
354 char responseheaders[MAX_URL_SIZE];
355
356 ret = rtsp_read_request(s, &request, "RECORD");
357 if (ret)
358 return ret;
359 ret = check_sessionid(s, &request);
360 if (ret)
361 return ret;
362 rt->seq++;
363 snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
364 rt->session_id);
365 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
366
367 rt->state = RTSP_STATE_STREAMING;
368 return 0;
369 }
370
parse_command_line(AVFormatContext * s,const char * line,int linelen,char * uri,int urisize,char * method,int methodsize,enum RTSPMethod * methodcode)371 static inline int parse_command_line(AVFormatContext *s, const char *line,
372 int linelen, char *uri, int urisize,
373 char *method, int methodsize,
374 enum RTSPMethod *methodcode)
375 {
376 RTSPState *rt = s->priv_data;
377 const char *linept, *searchlinept;
378 linept = strchr(line, ' ');
379
380 if (!linept) {
381 av_log(s, AV_LOG_ERROR, "Error parsing method string\n");
382 return AVERROR_INVALIDDATA;
383 }
384
385 if (linept - line > methodsize - 1) {
386 av_log(s, AV_LOG_ERROR, "Method string too long\n");
387 return AVERROR(EIO);
388 }
389 memcpy(method, line, linept - line);
390 method[linept - line] = '\0';
391 linept++;
392 if (!strcmp(method, "ANNOUNCE"))
393 *methodcode = ANNOUNCE;
394 else if (!strcmp(method, "OPTIONS"))
395 *methodcode = OPTIONS;
396 else if (!strcmp(method, "RECORD"))
397 *methodcode = RECORD;
398 else if (!strcmp(method, "SETUP"))
399 *methodcode = SETUP;
400 else if (!strcmp(method, "PAUSE"))
401 *methodcode = PAUSE;
402 else if (!strcmp(method, "TEARDOWN"))
403 *methodcode = TEARDOWN;
404 else
405 *methodcode = UNKNOWN;
406 /* Check method with the state */
407 if (rt->state == RTSP_STATE_IDLE) {
408 if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) {
409 av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n",
410 line);
411 return AVERROR_PROTOCOL_NOT_FOUND;
412 }
413 } else if (rt->state == RTSP_STATE_PAUSED) {
414 if ((*methodcode != OPTIONS) && (*methodcode != RECORD)
415 && (*methodcode != SETUP)) {
416 av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n",
417 line);
418 return AVERROR_PROTOCOL_NOT_FOUND;
419 }
420 } else if (rt->state == RTSP_STATE_STREAMING) {
421 if ((*methodcode != PAUSE) && (*methodcode != OPTIONS)
422 && (*methodcode != TEARDOWN)) {
423 av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State"
424 " %s\n", line);
425 return AVERROR_PROTOCOL_NOT_FOUND;
426 }
427 } else {
428 av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state);
429 return AVERROR_BUG;
430 }
431
432 searchlinept = strchr(linept, ' ');
433 if (!searchlinept) {
434 av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
435 return AVERROR_INVALIDDATA;
436 }
437 if (searchlinept - linept > urisize - 1) {
438 av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n");
439 return AVERROR(EIO);
440 }
441 memcpy(uri, linept, searchlinept - linept);
442 uri[searchlinept - linept] = '\0';
443 if (strcmp(rt->control_uri, uri)) {
444 char host[128], path[512], auth[128];
445 int port;
446 char ctl_host[128], ctl_path[512], ctl_auth[128];
447 int ctl_port;
448 av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
449 path, sizeof(path), uri);
450 av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host,
451 sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path),
452 rt->control_uri);
453 if (strcmp(host, ctl_host))
454 av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n",
455 host, ctl_host);
456 if (strcmp(path, ctl_path) && *methodcode != SETUP)
457 av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected"
458 " %s\n", path, ctl_path);
459 if (*methodcode == ANNOUNCE) {
460 av_log(s, AV_LOG_INFO,
461 "Updating control URI to %s\n", uri);
462 av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri));
463 }
464 }
465
466 linept = searchlinept + 1;
467 if (!av_strstart(linept, "RTSP/1.0", NULL)) {
468 av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n");
469 return AVERROR_PROTOCOL_NOT_FOUND;
470 }
471 return 0;
472 }
473
ff_rtsp_parse_streaming_commands(AVFormatContext * s)474 int ff_rtsp_parse_streaming_commands(AVFormatContext *s)
475 {
476 RTSPState *rt = s->priv_data;
477 unsigned char rbuf[MAX_URL_SIZE];
478 unsigned char method[10];
479 char uri[500];
480 int ret;
481 int rbuflen = 0;
482 RTSPMessageHeader request = { 0 };
483 enum RTSPMethod methodcode;
484
485 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
486 if (ret < 0)
487 return ret;
488 av_log(s, AV_LOG_TRACE, "Parsing[%d]: %s\n", rbuflen, rbuf);
489 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
490 sizeof(method), &methodcode);
491 if (ret) {
492 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
493 return ret;
494 }
495
496 ret = rtsp_read_request(s, &request, method);
497 if (ret)
498 return ret;
499 rt->seq++;
500 if (methodcode == PAUSE) {
501 rt->state = RTSP_STATE_PAUSED;
502 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
503 // TODO: Missing date header in response
504 } else if (methodcode == OPTIONS) {
505 ret = rtsp_send_reply(s, RTSP_STATUS_OK,
506 "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, "
507 "RECORD\r\n", request.seq);
508 } else if (methodcode == TEARDOWN) {
509 rt->state = RTSP_STATE_IDLE;
510 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
511 }
512 return ret;
513 }
514
rtsp_read_play(AVFormatContext * s)515 static int rtsp_read_play(AVFormatContext *s)
516 {
517 RTSPState *rt = s->priv_data;
518 RTSPMessageHeader reply1, *reply = &reply1;
519 int i;
520 char cmd[MAX_URL_SIZE];
521
522 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
523 rt->nb_byes = 0;
524
525 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
526 for (i = 0; i < rt->nb_rtsp_streams; i++) {
527 RTSPStream *rtsp_st = rt->rtsp_streams[i];
528 /* Try to initialize the connection state in a
529 * potential NAT router by sending dummy packets.
530 * RTP/RTCP dummy packets are used for RDT, too.
531 */
532 if (rtsp_st->rtp_handle &&
533 !(rt->server_type == RTSP_SERVER_WMS && i > 1))
534 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);
535 }
536 }
537 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
538 if (rt->transport == RTSP_TRANSPORT_RTP) {
539 for (i = 0; i < rt->nb_rtsp_streams; i++) {
540 RTSPStream *rtsp_st = rt->rtsp_streams[i];
541 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
542 if (!rtpctx)
543 continue;
544 ff_rtp_reset_packet_queue(rtpctx);
545 rtpctx->last_rtcp_ntp_time = AV_NOPTS_VALUE;
546 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
547 rtpctx->base_timestamp = 0;
548 rtpctx->timestamp = 0;
549 rtpctx->unwrapped_timestamp = 0;
550 rtpctx->rtcp_ts_offset = 0;
551 }
552 }
553 if (rt->state == RTSP_STATE_PAUSED) {
554 cmd[0] = 0;
555 } else {
556 snprintf(cmd, sizeof(cmd),
557 "Range: npt=%"PRId64".%03"PRId64"-\r\n",
558 rt->seek_timestamp / AV_TIME_BASE,
559 rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
560 }
561 ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
562 if (reply->status_code != RTSP_STATUS_OK) {
563 return ff_rtsp_averror(reply->status_code, -1);
564 }
565 if (rt->transport == RTSP_TRANSPORT_RTP &&
566 reply->range_start != AV_NOPTS_VALUE) {
567 for (i = 0; i < rt->nb_rtsp_streams; i++) {
568 RTSPStream *rtsp_st = rt->rtsp_streams[i];
569 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
570 AVStream *st = NULL;
571 if (!rtpctx || rtsp_st->stream_index < 0)
572 continue;
573
574 st = s->streams[rtsp_st->stream_index];
575 rtpctx->range_start_offset =
576 av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
577 st->time_base);
578 }
579 }
580 }
581 rt->state = RTSP_STATE_STREAMING;
582 return 0;
583 }
584
585 /* pause the stream */
rtsp_read_pause(AVFormatContext * s)586 static int rtsp_read_pause(AVFormatContext *s)
587 {
588 RTSPState *rt = s->priv_data;
589 RTSPMessageHeader reply1, *reply = &reply1;
590
591 if (rt->state != RTSP_STATE_STREAMING)
592 return 0;
593 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
594 ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
595 if (reply->status_code != RTSP_STATUS_OK) {
596 return ff_rtsp_averror(reply->status_code, -1);
597 }
598 }
599 rt->state = RTSP_STATE_PAUSED;
600 return 0;
601 }
602
ff_rtsp_setup_input_streams(AVFormatContext * s,RTSPMessageHeader * reply)603 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
604 {
605 RTSPState *rt = s->priv_data;
606 char cmd[MAX_URL_SIZE];
607 unsigned char *content = NULL;
608 int ret;
609
610 /* describe the stream */
611 snprintf(cmd, sizeof(cmd),
612 "Accept: application/sdp\r\n");
613 if (rt->server_type == RTSP_SERVER_REAL) {
614 /**
615 * The Require: attribute is needed for proper streaming from
616 * Realmedia servers.
617 */
618 av_strlcat(cmd,
619 "Require: com.real.retain-entity-for-setup\r\n",
620 sizeof(cmd));
621 }
622 ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
623 if (reply->status_code != RTSP_STATUS_OK) {
624 av_freep(&content);
625 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
626 }
627 if (!content)
628 return AVERROR_INVALIDDATA;
629
630 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
631 /* now we got the SDP description, we parse it */
632 ret = ff_sdp_parse(s, (const char *)content);
633 av_freep(&content);
634 if (ret < 0)
635 return ret;
636
637 return 0;
638 }
639
rtsp_listen(AVFormatContext * s)640 static int rtsp_listen(AVFormatContext *s)
641 {
642 RTSPState *rt = s->priv_data;
643 char proto[128], host[128], path[512], auth[128];
644 char uri[500];
645 int port;
646 int default_port = RTSP_DEFAULT_PORT;
647 char tcpname[500];
648 const char *lower_proto = "tcp";
649 unsigned char rbuf[MAX_URL_SIZE];
650 unsigned char method[10];
651 int rbuflen = 0;
652 int ret;
653 enum RTSPMethod methodcode;
654
655 if (!ff_network_init())
656 return AVERROR(EIO);
657
658 /* extract hostname and port */
659 av_url_split(proto, sizeof(proto), auth, sizeof(auth), host, sizeof(host),
660 &port, path, sizeof(path), s->url);
661
662 /* ff_url_join. No authorization by now (NULL) */
663 ff_url_join(rt->control_uri, sizeof(rt->control_uri), proto, NULL, host,
664 port, "%s", path);
665
666 if (!strcmp(proto, "rtsps")) {
667 lower_proto = "tls";
668 default_port = RTSPS_DEFAULT_PORT;
669 }
670
671 if (port < 0)
672 port = default_port;
673
674 /* Create TCP connection */
675 ff_url_join(tcpname, sizeof(tcpname), lower_proto, NULL, host, port,
676 "?listen&listen_timeout=%d", rt->initial_timeout * 1000);
677
678 if (ret = ffurl_open_whitelist(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
679 &s->interrupt_callback, NULL,
680 s->protocol_whitelist, s->protocol_blacklist, NULL)) {
681 av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n");
682 goto fail;
683 }
684 rt->state = RTSP_STATE_IDLE;
685 rt->rtsp_hd_out = rt->rtsp_hd;
686 for (;;) { /* Wait for incoming RTSP messages */
687 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
688 if (ret < 0)
689 goto fail;
690 av_log(s, AV_LOG_TRACE, "Parsing[%d]: %s\n", rbuflen, rbuf);
691 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
692 sizeof(method), &methodcode);
693 if (ret) {
694 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
695 goto fail;
696 }
697
698 if (methodcode == ANNOUNCE) {
699 ret = rtsp_read_announce(s);
700 rt->state = RTSP_STATE_PAUSED;
701 } else if (methodcode == OPTIONS) {
702 ret = rtsp_read_options(s);
703 } else if (methodcode == RECORD) {
704 ret = rtsp_read_record(s);
705 if (!ret)
706 return 0; // We are ready for streaming
707 } else if (methodcode == SETUP)
708 ret = rtsp_read_setup(s, host, uri);
709 if (ret) {
710 ret = AVERROR_INVALIDDATA;
711 goto fail;
712 }
713 }
714 fail:
715 ff_rtsp_close_streams(s);
716 ff_rtsp_close_connections(s);
717 ff_network_close();
718 return ret;
719 }
720
rtsp_probe(const AVProbeData * p)721 static int rtsp_probe(const AVProbeData *p)
722 {
723 if (
724 #if CONFIG_TLS_PROTOCOL
725 av_strstart(p->filename, "rtsps:", NULL) ||
726 #endif
727 av_strstart(p->filename, "satip:", NULL) ||
728 av_strstart(p->filename, "rtsp:", NULL))
729 return AVPROBE_SCORE_MAX;
730 return 0;
731 }
732
rtsp_read_header(AVFormatContext * s)733 static int rtsp_read_header(AVFormatContext *s)
734 {
735 RTSPState *rt = s->priv_data;
736 int ret;
737
738 if (rt->initial_timeout > 0)
739 rt->rtsp_flags |= RTSP_FLAG_LISTEN;
740
741 if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
742 ret = rtsp_listen(s);
743 if (ret)
744 return ret;
745 } else {
746 ret = ff_rtsp_connect(s);
747 if (ret)
748 return ret;
749
750 rt->real_setup_cache = !s->nb_streams ? NULL :
751 av_mallocz_array(s->nb_streams, 2 * sizeof(*rt->real_setup_cache));
752 if (!rt->real_setup_cache && s->nb_streams) {
753 ret = AVERROR(ENOMEM);
754 goto fail;
755 }
756 rt->real_setup = rt->real_setup_cache + s->nb_streams;
757
758 if (rt->initial_pause) {
759 /* do not start immediately */
760 } else {
761 ret = rtsp_read_play(s);
762 if (ret < 0)
763 goto fail;
764 }
765 }
766
767 return 0;
768
769 fail:
770 rtsp_read_close(s);
771 return ret;
772 }
773
ff_rtsp_tcp_read_packet(AVFormatContext * s,RTSPStream ** prtsp_st,uint8_t * buf,int buf_size)774 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
775 uint8_t *buf, int buf_size)
776 {
777 RTSPState *rt = s->priv_data;
778 int id, len, i, ret;
779 RTSPStream *rtsp_st;
780
781 av_log(s, AV_LOG_TRACE, "tcp_read_packet:\n");
782 redo:
783 for (;;) {
784 RTSPMessageHeader reply;
785
786 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
787 if (ret < 0)
788 return ret;
789 if (ret == 1) /* received '$' */
790 break;
791 /* XXX: parse message */
792 if (rt->state != RTSP_STATE_STREAMING)
793 return 0;
794 }
795 ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
796 if (ret != 3)
797 return AVERROR(EIO);
798 id = buf[0];
799 len = AV_RB16(buf + 1);
800 av_log(s, AV_LOG_TRACE, "id=%d len=%d\n", id, len);
801 if (len > buf_size || len < 8)
802 goto redo;
803 /* get the data */
804 ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
805 if (ret != len)
806 return AVERROR(EIO);
807 if (rt->transport == RTSP_TRANSPORT_RDT &&
808 (ret = ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL)) < 0)
809 return ret;
810
811 /* find the matching stream */
812 for (i = 0; i < rt->nb_rtsp_streams; i++) {
813 rtsp_st = rt->rtsp_streams[i];
814 if (id >= rtsp_st->interleaved_min &&
815 id <= rtsp_st->interleaved_max)
816 goto found;
817 }
818 goto redo;
819 found:
820 *prtsp_st = rtsp_st;
821 return len;
822 }
823
resetup_tcp(AVFormatContext * s)824 static int resetup_tcp(AVFormatContext *s)
825 {
826 RTSPState *rt = s->priv_data;
827 char host[1024];
828 int port;
829
830 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
831 s->url);
832 ff_rtsp_undo_setup(s, 0);
833 return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
834 rt->real_challenge);
835 }
836
rtsp_read_packet(AVFormatContext * s,AVPacket * pkt)837 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
838 {
839 RTSPState *rt = s->priv_data;
840 int ret;
841 RTSPMessageHeader reply1, *reply = &reply1;
842 char cmd[MAX_URL_SIZE];
843
844 retry:
845 if (rt->server_type == RTSP_SERVER_REAL) {
846 int i;
847
848 for (i = 0; i < s->nb_streams; i++)
849 rt->real_setup[i] = s->streams[i]->discard;
850
851 if (!rt->need_subscription) {
852 if (memcmp (rt->real_setup, rt->real_setup_cache,
853 sizeof(enum AVDiscard) * s->nb_streams)) {
854 snprintf(cmd, sizeof(cmd),
855 "Unsubscribe: %s\r\n",
856 rt->last_subscription);
857 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
858 cmd, reply, NULL);
859 if (reply->status_code != RTSP_STATUS_OK)
860 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
861 rt->need_subscription = 1;
862 }
863 }
864
865 if (rt->need_subscription) {
866 int r, rule_nr, first = 1;
867
868 memcpy(rt->real_setup_cache, rt->real_setup,
869 sizeof(enum AVDiscard) * s->nb_streams);
870 rt->last_subscription[0] = 0;
871
872 snprintf(cmd, sizeof(cmd),
873 "Subscribe: ");
874 for (i = 0; i < rt->nb_rtsp_streams; i++) {
875 rule_nr = 0;
876 for (r = 0; r < s->nb_streams; r++) {
877 if (s->streams[r]->id == i) {
878 if (s->streams[r]->discard != AVDISCARD_ALL) {
879 if (!first)
880 av_strlcat(rt->last_subscription, ",",
881 sizeof(rt->last_subscription));
882 ff_rdt_subscribe_rule(
883 rt->last_subscription,
884 sizeof(rt->last_subscription), i, rule_nr);
885 first = 0;
886 }
887 rule_nr++;
888 }
889 }
890 }
891 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
892 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
893 cmd, reply, NULL);
894 if (reply->status_code != RTSP_STATUS_OK)
895 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
896 rt->need_subscription = 0;
897
898 if (rt->state == RTSP_STATE_STREAMING)
899 rtsp_read_play (s);
900 }
901 }
902
903 ret = ff_rtsp_fetch_packet(s, pkt);
904 if (ret < 0) {
905 if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
906 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
907 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
908 RTSPMessageHeader reply1, *reply = &reply1;
909 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
910 if (rtsp_read_pause(s) != 0)
911 return -1;
912 // TEARDOWN is required on Real-RTSP, but might make
913 // other servers close the connection.
914 if (rt->server_type == RTSP_SERVER_REAL)
915 ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
916 reply, NULL);
917 rt->session_id[0] = '\0';
918 if (resetup_tcp(s) == 0) {
919 rt->state = RTSP_STATE_IDLE;
920 rt->need_subscription = 1;
921 if (rtsp_read_play(s) != 0)
922 return -1;
923 goto retry;
924 }
925 }
926 }
927 return ret;
928 }
929 rt->packets++;
930
931 if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) {
932 /* send dummy request to keep TCP connection alive */
933 if ((av_gettime_relative() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
934 rt->auth_state.stale) {
935 if (rt->server_type == RTSP_SERVER_WMS ||
936 (rt->server_type != RTSP_SERVER_REAL &&
937 rt->get_parameter_supported)) {
938 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
939 } else {
940 ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL);
941 }
942 /* The stale flag should be reset when creating the auth response in
943 * ff_rtsp_send_cmd_async, but reset it here just in case we never
944 * called the auth code (if we didn't have any credentials set). */
945 rt->auth_state.stale = 0;
946 }
947 }
948
949 return 0;
950 }
951
rtsp_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)952 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
953 int64_t timestamp, int flags)
954 {
955 RTSPState *rt = s->priv_data;
956 int ret;
957
958 rt->seek_timestamp = av_rescale_q(timestamp,
959 s->streams[stream_index]->time_base,
960 AV_TIME_BASE_Q);
961 switch(rt->state) {
962 default:
963 case RTSP_STATE_IDLE:
964 break;
965 case RTSP_STATE_STREAMING:
966 if ((ret = rtsp_read_pause(s)) != 0)
967 return ret;
968 rt->state = RTSP_STATE_SEEKING;
969 if ((ret = rtsp_read_play(s)) != 0)
970 return ret;
971 break;
972 case RTSP_STATE_PAUSED:
973 rt->state = RTSP_STATE_IDLE;
974 break;
975 }
976 return 0;
977 }
978
979 static const AVClass rtsp_demuxer_class = {
980 .class_name = "RTSP demuxer",
981 .item_name = av_default_item_name,
982 .option = ff_rtsp_options,
983 .version = LIBAVUTIL_VERSION_INT,
984 };
985
986 AVInputFormat ff_rtsp_demuxer = {
987 .name = "rtsp",
988 .long_name = NULL_IF_CONFIG_SMALL("RTSP input"),
989 .priv_data_size = sizeof(RTSPState),
990 .read_probe = rtsp_probe,
991 .read_header = rtsp_read_header,
992 .read_packet = rtsp_read_packet,
993 .read_close = rtsp_read_close,
994 .read_seek = rtsp_read_seek,
995 .flags = AVFMT_NOFILE,
996 .read_play = rtsp_read_play,
997 .read_pause = rtsp_read_pause,
998 .priv_class = &rtsp_demuxer_class,
999 };
1000