FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/rtspdec.c
Date: 2024-03-28 04:31:58
Exec Total Coverage
Lines: 5 590 0.8%
Functions: 1 21 4.8%
Branches: 2 349 0.6%

Line Branch Exec Source
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 "config_components.h"
23
24 #include "libavutil/avstring.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/mathematics.h"
27 #include "libavutil/random_seed.h"
28 #include "libavutil/time.h"
29 #include "avformat.h"
30 #include "demux.h"
31
32 #include "internal.h"
33 #include "network.h"
34 #include "os_support.h"
35 #include "rtpproto.h"
36 #include "rtsp.h"
37 #include "rdt.h"
38 #include "tls.h"
39 #include "url.h"
40 #include "version.h"
41
42 static const struct RTSPStatusMessage {
43 enum RTSPStatusCode code;
44 const char *message;
45 } status_messages[] = {
46 { RTSP_STATUS_OK, "OK" },
47 { RTSP_STATUS_METHOD, "Method Not Allowed" },
48 { RTSP_STATUS_BANDWIDTH, "Not Enough Bandwidth" },
49 { RTSP_STATUS_SESSION, "Session Not Found" },
50 { RTSP_STATUS_STATE, "Method Not Valid in This State" },
51 { RTSP_STATUS_AGGREGATE, "Aggregate operation not allowed" },
52 { RTSP_STATUS_ONLY_AGGREGATE, "Only aggregate operation allowed" },
53 { RTSP_STATUS_TRANSPORT, "Unsupported transport" },
54 { RTSP_STATUS_INTERNAL, "Internal Server Error" },
55 { RTSP_STATUS_SERVICE, "Service Unavailable" },
56 { RTSP_STATUS_VERSION, "RTSP Version not supported" },
57 { 0, "NULL" }
58 };
59
60 static int rtsp_read_close(AVFormatContext *s)
61 {
62 RTSPState *rt = s->priv_data;
63
64 if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN))
65 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
66
67 ff_rtsp_close_streams(s);
68 ff_rtsp_close_connections(s);
69 ff_network_close();
70 rt->real_setup = NULL;
71 av_freep(&rt->real_setup_cache);
72 return 0;
73 }
74
75 static inline int read_line(AVFormatContext *s, char *rbuf, const int rbufsize,
76 int *rbuflen)
77 {
78 RTSPState *rt = s->priv_data;
79 int idx = 0;
80 int ret = 0;
81 *rbuflen = 0;
82
83 do {
84 ret = ffurl_read_complete(rt->rtsp_hd, rbuf + idx, 1);
85 if (ret <= 0)
86 return ret ? ret : AVERROR_EOF;
87 if (rbuf[idx] == '\r') {
88 /* Ignore */
89 } else if (rbuf[idx] == '\n') {
90 rbuf[idx] = '\0';
91 *rbuflen = idx;
92 return 0;
93 } else
94 idx++;
95 } while (idx < rbufsize);
96 av_log(s, AV_LOG_ERROR, "Message too long\n");
97 return AVERROR(EIO);
98 }
99
100 static int rtsp_send_reply(AVFormatContext *s, enum RTSPStatusCode code,
101 const char *extracontent, uint16_t seq)
102 {
103 RTSPState *rt = s->priv_data;
104 char message[MAX_URL_SIZE];
105 int index = 0;
106 while (status_messages[index].code) {
107 if (status_messages[index].code == code) {
108 snprintf(message, sizeof(message), "RTSP/1.0 %d %s\r\n",
109 code, status_messages[index].message);
110 break;
111 }
112 index++;
113 }
114 if (!status_messages[index].code)
115 return AVERROR(EINVAL);
116 av_strlcatf(message, sizeof(message), "CSeq: %d\r\n", seq);
117 av_strlcatf(message, sizeof(message), "Server: %s\r\n", LIBAVFORMAT_IDENT);
118 if (extracontent)
119 av_strlcat(message, extracontent, sizeof(message));
120 av_strlcat(message, "\r\n", sizeof(message));
121 av_log(s, AV_LOG_TRACE, "Sending response:\n%s", message);
122 ffurl_write(rt->rtsp_hd_out, message, strlen(message));
123
124 return 0;
125 }
126
127 static inline int check_sessionid(AVFormatContext *s,
128 RTSPMessageHeader *request)
129 {
130 RTSPState *rt = s->priv_data;
131 unsigned char *session_id = rt->session_id;
132 if (!session_id[0]) {
133 av_log(s, AV_LOG_WARNING, "There is no session-id at the moment\n");
134 return 0;
135 }
136 if (strcmp(session_id, request->session_id)) {
137 av_log(s, AV_LOG_ERROR, "Unexpected session-id %s\n",
138 request->session_id);
139 rtsp_send_reply(s, RTSP_STATUS_SESSION, NULL, request->seq);
140 return AVERROR_STREAM_NOT_FOUND;
141 }
142 return 0;
143 }
144
145 static inline int rtsp_read_request(AVFormatContext *s,
146 RTSPMessageHeader *request,
147 const char *method)
148 {
149 RTSPState *rt = s->priv_data;
150 char rbuf[MAX_URL_SIZE];
151 int rbuflen, ret;
152 do {
153 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
154 if (ret)
155 return ret;
156 if (rbuflen > 1) {
157 av_log(s, AV_LOG_TRACE, "Parsing[%d]: %s\n", rbuflen, rbuf);
158 ff_rtsp_parse_line(s, request, rbuf, rt, method);
159 }
160 } while (rbuflen > 0);
161 if (request->seq != rt->seq + 1) {
162 av_log(s, AV_LOG_ERROR, "Unexpected Sequence number %d\n",
163 request->seq);
164 return AVERROR(EINVAL);
165 }
166 if (rt->session_id[0] && strcmp(method, "OPTIONS")) {
167 ret = check_sessionid(s, request);
168 if (ret)
169 return ret;
170 }
171
172 return 0;
173 }
174
175 static int rtsp_read_announce(AVFormatContext *s)
176 {
177 RTSPState *rt = s->priv_data;
178 RTSPMessageHeader request = { 0 };
179 char *sdp;
180 int ret;
181
182 ret = rtsp_read_request(s, &request, "ANNOUNCE");
183 if (ret)
184 return ret;
185 rt->seq++;
186 if (strcmp(request.content_type, "application/sdp")) {
187 av_log(s, AV_LOG_ERROR, "Unexpected content type %s\n",
188 request.content_type);
189 rtsp_send_reply(s, RTSP_STATUS_SERVICE, NULL, request.seq);
190 return AVERROR_OPTION_NOT_FOUND;
191 }
192 if (request.content_length) {
193 sdp = av_malloc(request.content_length + 1);
194 if (!sdp)
195 return AVERROR(ENOMEM);
196
197 /* Read SDP */
198 if (ffurl_read_complete(rt->rtsp_hd, sdp, request.content_length)
199 < request.content_length) {
200 av_log(s, AV_LOG_ERROR,
201 "Unable to get complete SDP Description in ANNOUNCE\n");
202 rtsp_send_reply(s, RTSP_STATUS_INTERNAL, NULL, request.seq);
203 av_free(sdp);
204 return AVERROR(EIO);
205 }
206 sdp[request.content_length] = '\0';
207 av_log(s, AV_LOG_VERBOSE, "SDP: %s\n", sdp);
208 ret = ff_sdp_parse(s, sdp);
209 av_free(sdp);
210 if (ret)
211 return ret;
212 rtsp_send_reply(s, RTSP_STATUS_OK, NULL, request.seq);
213 return 0;
214 }
215 av_log(s, AV_LOG_ERROR,
216 "Content-Length header value exceeds sdp allocated buffer (4KB)\n");
217 rtsp_send_reply(s, RTSP_STATUS_INTERNAL,
218 "Content-Length exceeds buffer size", request.seq);
219 return AVERROR(EIO);
220 }
221
222 static int rtsp_read_options(AVFormatContext *s)
223 {
224 RTSPState *rt = s->priv_data;
225 RTSPMessageHeader request = { 0 };
226 int ret = 0;
227
228 /* Parsing headers */
229 ret = rtsp_read_request(s, &request, "OPTIONS");
230 if (ret)
231 return ret;
232 rt->seq++;
233 /* Send Reply */
234 rtsp_send_reply(s, RTSP_STATUS_OK,
235 "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, RECORD\r\n",
236 request.seq);
237 return 0;
238 }
239
240 static int rtsp_read_setup(AVFormatContext *s, char* host, char *controlurl)
241 {
242 RTSPState *rt = s->priv_data;
243 RTSPMessageHeader request = { 0 };
244 int ret = 0;
245 char url[MAX_URL_SIZE];
246 RTSPStream *rtsp_st;
247 char responseheaders[MAX_URL_SIZE];
248 int localport = -1;
249 int transportidx = 0;
250 int streamid = 0;
251
252 ret = rtsp_read_request(s, &request, "SETUP");
253 if (ret)
254 return ret;
255 rt->seq++;
256 if (!request.nb_transports) {
257 av_log(s, AV_LOG_ERROR, "No transport defined in SETUP\n");
258 return AVERROR_INVALIDDATA;
259 }
260 for (transportidx = 0; transportidx < request.nb_transports;
261 transportidx++) {
262 if (!request.transports[transportidx].mode_record ||
263 (request.transports[transportidx].lower_transport !=
264 RTSP_LOWER_TRANSPORT_UDP &&
265 request.transports[transportidx].lower_transport !=
266 RTSP_LOWER_TRANSPORT_TCP)) {
267 av_log(s, AV_LOG_ERROR, "mode=record/receive not set or transport"
268 " protocol not supported (yet)\n");
269 return AVERROR_INVALIDDATA;
270 }
271 }
272 if (request.nb_transports > 1)
273 av_log(s, AV_LOG_WARNING, "More than one transport not supported, "
274 "using first of all\n");
275 for (streamid = 0; streamid < rt->nb_rtsp_streams; streamid++) {
276 if (!strcmp(rt->rtsp_streams[streamid]->control_url,
277 controlurl))
278 break;
279 }
280 if (streamid == rt->nb_rtsp_streams) {
281 av_log(s, AV_LOG_ERROR, "Unable to find requested track\n");
282 return AVERROR_STREAM_NOT_FOUND;
283 }
284 rtsp_st = rt->rtsp_streams[streamid];
285 localport = rt->rtp_port_min;
286
287 /* check if the stream has already been setup */
288 if (rtsp_st->transport_priv) {
289 if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RDT)
290 ff_rdt_parse_close(rtsp_st->transport_priv);
291 else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RTP)
292 ff_rtp_parse_close(rtsp_st->transport_priv);
293 rtsp_st->transport_priv = NULL;
294 }
295 if (rtsp_st->rtp_handle)
296 ffurl_closep(&rtsp_st->rtp_handle);
297
298 if (request.transports[0].lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
299 rt->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
300 if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
301 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
302 return ret;
303 }
304 rtsp_st->interleaved_min = request.transports[0].interleaved_min;
305 rtsp_st->interleaved_max = request.transports[0].interleaved_max;
306 snprintf(responseheaders, sizeof(responseheaders), "Transport: "
307 "RTP/AVP/TCP;unicast;mode=record;interleaved=%d-%d"
308 "\r\n", request.transports[0].interleaved_min,
309 request.transports[0].interleaved_max);
310 } else {
311 do {
312 AVDictionary *opts = NULL;
313 av_dict_set_int(&opts, "buffer_size", rt->buffer_size, 0);
314 ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);
315 av_log(s, AV_LOG_TRACE, "Opening: %s\n", url);
316 ret = ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
317 &s->interrupt_callback, &opts,
318 s->protocol_whitelist, s->protocol_blacklist, NULL);
319 av_dict_free(&opts);
320 if (ret)
321 localport += 2;
322 } while (ret || localport > rt->rtp_port_max);
323 if (localport > rt->rtp_port_max) {
324 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
325 return ret;
326 }
327
328 av_log(s, AV_LOG_TRACE, "Listening on: %d\n",
329 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle));
330 if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
331 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
332 return ret;
333 }
334
335 localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
336 snprintf(responseheaders, sizeof(responseheaders), "Transport: "
337 "RTP/AVP/UDP;unicast;mode=record;source=%s;"
338 "client_port=%d-%d;server_port=%d-%d\r\n",
339 host, request.transports[0].client_port_min,
340 request.transports[0].client_port_max, localport,
341 localport + 1);
342 }
343
344 /* Establish sessionid if not previously set */
345 /* Put this in a function? */
346 /* RFC 2326: session id must be at least 8 digits */
347 while (strlen(rt->session_id) < 8)
348 av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed());
349
350 av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
351 rt->session_id);
352 /* Send Reply */
353 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
354
355 rt->state = RTSP_STATE_PAUSED;
356 return 0;
357 }
358
359 static int rtsp_read_record(AVFormatContext *s)
360 {
361 RTSPState *rt = s->priv_data;
362 RTSPMessageHeader request = { 0 };
363 int ret = 0;
364 char responseheaders[MAX_URL_SIZE];
365
366 ret = rtsp_read_request(s, &request, "RECORD");
367 if (ret)
368 return ret;
369 ret = check_sessionid(s, &request);
370 if (ret)
371 return ret;
372 rt->seq++;
373 snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
374 rt->session_id);
375 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
376
377 rt->state = RTSP_STATE_STREAMING;
378 return 0;
379 }
380
381 static inline int parse_command_line(AVFormatContext *s, const char *line,
382 int linelen, char *uri, int urisize,
383 char *method, int methodsize,
384 enum RTSPMethod *methodcode)
385 {
386 RTSPState *rt = s->priv_data;
387 const char *linept, *searchlinept;
388 linept = strchr(line, ' ');
389
390 if (!linept) {
391 av_log(s, AV_LOG_ERROR, "Error parsing method string\n");
392 return AVERROR_INVALIDDATA;
393 }
394
395 if (linept - line > methodsize - 1) {
396 av_log(s, AV_LOG_ERROR, "Method string too long\n");
397 return AVERROR(EIO);
398 }
399 memcpy(method, line, linept - line);
400 method[linept - line] = '\0';
401 linept++;
402 if (!strcmp(method, "ANNOUNCE"))
403 *methodcode = ANNOUNCE;
404 else if (!strcmp(method, "OPTIONS"))
405 *methodcode = OPTIONS;
406 else if (!strcmp(method, "RECORD"))
407 *methodcode = RECORD;
408 else if (!strcmp(method, "SETUP"))
409 *methodcode = SETUP;
410 else if (!strcmp(method, "PAUSE"))
411 *methodcode = PAUSE;
412 else if (!strcmp(method, "TEARDOWN"))
413 *methodcode = TEARDOWN;
414 else
415 *methodcode = UNKNOWN;
416 /* Check method with the state */
417 if (rt->state == RTSP_STATE_IDLE) {
418 if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) {
419 av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n",
420 line);
421 return AVERROR_PROTOCOL_NOT_FOUND;
422 }
423 } else if (rt->state == RTSP_STATE_PAUSED) {
424 if ((*methodcode != OPTIONS) && (*methodcode != RECORD)
425 && (*methodcode != SETUP)) {
426 av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n",
427 line);
428 return AVERROR_PROTOCOL_NOT_FOUND;
429 }
430 } else if (rt->state == RTSP_STATE_STREAMING) {
431 if ((*methodcode != PAUSE) && (*methodcode != OPTIONS)
432 && (*methodcode != TEARDOWN)) {
433 av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State"
434 " %s\n", line);
435 return AVERROR_PROTOCOL_NOT_FOUND;
436 }
437 } else {
438 av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state);
439 return AVERROR_BUG;
440 }
441
442 searchlinept = strchr(linept, ' ');
443 if (!searchlinept) {
444 av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
445 return AVERROR_INVALIDDATA;
446 }
447 if (searchlinept - linept > urisize - 1) {
448 av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n");
449 return AVERROR(EIO);
450 }
451 memcpy(uri, linept, searchlinept - linept);
452 uri[searchlinept - linept] = '\0';
453 if (strcmp(rt->control_uri, uri)) {
454 char host[128], path[512], auth[128];
455 int port;
456 char ctl_host[128], ctl_path[512], ctl_auth[128];
457 int ctl_port;
458 av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
459 path, sizeof(path), uri);
460 av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host,
461 sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path),
462 rt->control_uri);
463 if (strcmp(host, ctl_host))
464 av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n",
465 host, ctl_host);
466 if (strcmp(path, ctl_path) && *methodcode != SETUP)
467 av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected"
468 " %s\n", path, ctl_path);
469 if (*methodcode == ANNOUNCE) {
470 av_log(s, AV_LOG_INFO,
471 "Updating control URI to %s\n", uri);
472 av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri));
473 }
474 }
475
476 linept = searchlinept + 1;
477 if (!av_strstart(linept, "RTSP/1.0", NULL)) {
478 av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n");
479 return AVERROR_PROTOCOL_NOT_FOUND;
480 }
481 return 0;
482 }
483
484 int ff_rtsp_parse_streaming_commands(AVFormatContext *s)
485 {
486 RTSPState *rt = s->priv_data;
487 unsigned char rbuf[MAX_URL_SIZE];
488 unsigned char method[10];
489 char uri[500];
490 int ret;
491 int rbuflen = 0;
492 RTSPMessageHeader request = { 0 };
493 enum RTSPMethod methodcode;
494
495 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
496 if (ret < 0)
497 return ret;
498 av_log(s, AV_LOG_TRACE, "Parsing[%d]: %s\n", rbuflen, rbuf);
499 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
500 sizeof(method), &methodcode);
501 if (ret) {
502 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
503 return ret;
504 }
505
506 ret = rtsp_read_request(s, &request, method);
507 if (ret)
508 return ret;
509 rt->seq++;
510 if (methodcode == PAUSE) {
511 rt->state = RTSP_STATE_PAUSED;
512 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
513 // TODO: Missing date header in response
514 } else if (methodcode == OPTIONS) {
515 ret = rtsp_send_reply(s, RTSP_STATUS_OK,
516 "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, "
517 "RECORD\r\n", request.seq);
518 } else if (methodcode == TEARDOWN) {
519 rt->state = RTSP_STATE_IDLE;
520 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
521 }
522 return ret;
523 }
524
525 static int rtsp_read_play(AVFormatContext *s)
526 {
527 RTSPState *rt = s->priv_data;
528 RTSPMessageHeader reply1, *reply = &reply1;
529 int i;
530 char cmd[MAX_URL_SIZE];
531
532 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
533 rt->nb_byes = 0;
534
535 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
536 for (i = 0; i < rt->nb_rtsp_streams; i++) {
537 RTSPStream *rtsp_st = rt->rtsp_streams[i];
538 /* Try to initialize the connection state in a
539 * potential NAT router by sending dummy packets.
540 * RTP/RTCP dummy packets are used for RDT, too.
541 */
542 if (rtsp_st->rtp_handle &&
543 !(rt->server_type == RTSP_SERVER_WMS && i > 1))
544 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);
545 }
546 }
547 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
548 if (rt->transport == RTSP_TRANSPORT_RTP) {
549 for (i = 0; i < rt->nb_rtsp_streams; i++) {
550 RTSPStream *rtsp_st = rt->rtsp_streams[i];
551 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
552 if (!rtpctx)
553 continue;
554 ff_rtp_reset_packet_queue(rtpctx);
555 rtpctx->last_rtcp_ntp_time = AV_NOPTS_VALUE;
556 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
557 rtpctx->base_timestamp = 0;
558 rtpctx->timestamp = 0;
559 rtpctx->unwrapped_timestamp = 0;
560 rtpctx->rtcp_ts_offset = 0;
561 }
562 }
563 if (rt->state == RTSP_STATE_PAUSED) {
564 cmd[0] = 0;
565 } else {
566 snprintf(cmd, sizeof(cmd),
567 "Range: npt=%"PRId64".%03"PRId64"-\r\n",
568 rt->seek_timestamp / AV_TIME_BASE,
569 rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
570 }
571 ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
572 if (reply->status_code != RTSP_STATUS_OK) {
573 return ff_rtsp_averror(reply->status_code, -1);
574 }
575 if (rt->transport == RTSP_TRANSPORT_RTP &&
576 reply->range_start != AV_NOPTS_VALUE) {
577 for (i = 0; i < rt->nb_rtsp_streams; i++) {
578 RTSPStream *rtsp_st = rt->rtsp_streams[i];
579 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
580 AVStream *st = NULL;
581 if (!rtpctx || rtsp_st->stream_index < 0)
582 continue;
583
584 st = s->streams[rtsp_st->stream_index];
585 rtpctx->range_start_offset =
586 av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
587 st->time_base);
588 }
589 }
590 }
591 rt->state = RTSP_STATE_STREAMING;
592 return 0;
593 }
594
595 /* pause the stream */
596 static int rtsp_read_pause(AVFormatContext *s)
597 {
598 RTSPState *rt = s->priv_data;
599 RTSPMessageHeader reply1, *reply = &reply1;
600
601 if (rt->state != RTSP_STATE_STREAMING)
602 return 0;
603 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
604 ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
605 if (reply->status_code != RTSP_STATUS_OK) {
606 return ff_rtsp_averror(reply->status_code, -1);
607 }
608 }
609 rt->state = RTSP_STATE_PAUSED;
610 return 0;
611 }
612
613 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
614 {
615 RTSPState *rt = s->priv_data;
616 char cmd[MAX_URL_SIZE];
617 unsigned char *content = NULL;
618 int ret;
619
620 /* describe the stream */
621 snprintf(cmd, sizeof(cmd),
622 "Accept: application/sdp\r\n");
623 if (rt->server_type == RTSP_SERVER_REAL) {
624 /**
625 * The Require: attribute is needed for proper streaming from
626 * Realmedia servers.
627 */
628 av_strlcat(cmd,
629 "Require: com.real.retain-entity-for-setup\r\n",
630 sizeof(cmd));
631 }
632 ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
633 if (reply->status_code != RTSP_STATUS_OK) {
634 av_freep(&content);
635 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
636 }
637 if (!content)
638 return AVERROR_INVALIDDATA;
639
640 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
641 /* now we got the SDP description, we parse it */
642 ret = ff_sdp_parse(s, (const char *)content);
643 av_freep(&content);
644 if (ret < 0)
645 return ret;
646
647 return 0;
648 }
649
650 static int rtsp_listen(AVFormatContext *s)
651 {
652 RTSPState *rt = s->priv_data;
653 char proto[128], host[128], path[512], auth[128];
654 char uri[500];
655 int port;
656 int default_port = RTSP_DEFAULT_PORT;
657 char tcpname[500];
658 const char *lower_proto = "tcp";
659 unsigned char rbuf[MAX_URL_SIZE];
660 unsigned char method[10];
661 int rbuflen = 0;
662 int ret;
663 enum RTSPMethod methodcode;
664
665 if (!ff_network_init())
666 return AVERROR(EIO);
667
668 /* extract hostname and port */
669 av_url_split(proto, sizeof(proto), auth, sizeof(auth), host, sizeof(host),
670 &port, path, sizeof(path), s->url);
671
672 /* ff_url_join. No authorization by now (NULL) */
673 ff_url_join(rt->control_uri, sizeof(rt->control_uri), proto, NULL, host,
674 port, "%s", path);
675
676 if (!strcmp(proto, "rtsps")) {
677 lower_proto = "tls";
678 default_port = RTSPS_DEFAULT_PORT;
679 }
680
681 if (port < 0)
682 port = default_port;
683
684 /* Create TCP connection */
685 ff_url_join(tcpname, sizeof(tcpname), lower_proto, NULL, host, port,
686 "?listen&listen_timeout=%d", rt->initial_timeout * 1000);
687
688 if (ret = ffurl_open_whitelist(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
689 &s->interrupt_callback, NULL,
690 s->protocol_whitelist, s->protocol_blacklist, NULL)) {
691 av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n");
692 goto fail;
693 }
694 rt->state = RTSP_STATE_IDLE;
695 rt->rtsp_hd_out = rt->rtsp_hd;
696 for (;;) { /* Wait for incoming RTSP messages */
697 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
698 if (ret < 0)
699 goto fail;
700 av_log(s, AV_LOG_TRACE, "Parsing[%d]: %s\n", rbuflen, rbuf);
701 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
702 sizeof(method), &methodcode);
703 if (ret) {
704 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
705 goto fail;
706 }
707
708 if (methodcode == ANNOUNCE) {
709 ret = rtsp_read_announce(s);
710 rt->state = RTSP_STATE_PAUSED;
711 } else if (methodcode == OPTIONS) {
712 ret = rtsp_read_options(s);
713 } else if (methodcode == RECORD) {
714 ret = rtsp_read_record(s);
715 if (!ret)
716 return 0; // We are ready for streaming
717 } else if (methodcode == SETUP)
718 ret = rtsp_read_setup(s, host, uri);
719 if (ret) {
720 ret = AVERROR_INVALIDDATA;
721 goto fail;
722 }
723 }
724 fail:
725 ff_rtsp_close_streams(s);
726 ff_rtsp_close_connections(s);
727 ff_network_close();
728 return ret;
729 }
730
731 3791 static int rtsp_probe(const AVProbeData *p)
732 {
733
1/2
✓ Branch 0 taken 3791 times.
✗ Branch 1 not taken.
3791 if (
734 #if CONFIG_TLS_PROTOCOL
735 av_strstart(p->filename, "rtsps:", NULL) ||
736 #endif
737
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 3791 times.
7582 av_strstart(p->filename, "satip:", NULL) ||
738 3791 av_strstart(p->filename, "rtsp:", NULL))
739 return AVPROBE_SCORE_MAX;
740 3791 return 0;
741 }
742
743 static int rtsp_read_header(AVFormatContext *s)
744 {
745 RTSPState *rt = s->priv_data;
746 int ret;
747
748 if (rt->initial_timeout > 0)
749 rt->rtsp_flags |= RTSP_FLAG_LISTEN;
750
751 if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
752 ret = rtsp_listen(s);
753 if (ret)
754 return ret;
755 } else {
756 ret = ff_rtsp_connect(s);
757 if (ret)
758 return ret;
759
760 rt->real_setup_cache = !s->nb_streams ? NULL :
761 av_calloc(s->nb_streams, 2 * sizeof(*rt->real_setup_cache));
762 if (!rt->real_setup_cache && s->nb_streams) {
763 ret = AVERROR(ENOMEM);
764 goto fail;
765 }
766 rt->real_setup = rt->real_setup_cache + s->nb_streams;
767
768 if (rt->initial_pause) {
769 /* do not start immediately */
770 } else {
771 ret = rtsp_read_play(s);
772 if (ret < 0)
773 goto fail;
774 }
775 }
776
777 return 0;
778
779 fail:
780 rtsp_read_close(s);
781 return ret;
782 }
783
784 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
785 uint8_t *buf, int buf_size)
786 {
787 RTSPState *rt = s->priv_data;
788 int id, len, i, ret;
789 RTSPStream *rtsp_st;
790
791 av_log(s, AV_LOG_TRACE, "tcp_read_packet:\n");
792 redo:
793 for (;;) {
794 RTSPMessageHeader reply;
795
796 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
797 if (ret < 0)
798 return ret;
799 if (ret == 1) /* received '$' */
800 break;
801 /* XXX: parse message */
802 if (rt->state != RTSP_STATE_STREAMING)
803 return 0;
804 }
805 ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
806 if (ret != 3)
807 return AVERROR(EIO);
808 id = buf[0];
809 len = AV_RB16(buf + 1);
810 av_log(s, AV_LOG_TRACE, "id=%d len=%d\n", id, len);
811 if (len > buf_size || len < 8)
812 goto redo;
813 /* get the data */
814 ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
815 if (ret != len)
816 return AVERROR(EIO);
817 if (rt->transport == RTSP_TRANSPORT_RDT &&
818 (ret = ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL)) < 0)
819 return ret;
820
821 /* find the matching stream */
822 for (i = 0; i < rt->nb_rtsp_streams; i++) {
823 rtsp_st = rt->rtsp_streams[i];
824 if (id >= rtsp_st->interleaved_min &&
825 id <= rtsp_st->interleaved_max)
826 goto found;
827 }
828 goto redo;
829 found:
830 *prtsp_st = rtsp_st;
831 return len;
832 }
833
834 static int resetup_tcp(AVFormatContext *s)
835 {
836 RTSPState *rt = s->priv_data;
837 char host[1024];
838 int port;
839
840 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
841 s->url);
842 ff_rtsp_undo_setup(s, 0);
843 return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
844 rt->real_challenge);
845 }
846
847 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
848 {
849 RTSPState *rt = s->priv_data;
850 int ret;
851 RTSPMessageHeader reply1, *reply = &reply1;
852 char cmd[MAX_URL_SIZE];
853
854 retry:
855 if (rt->server_type == RTSP_SERVER_REAL) {
856 int i;
857
858 for (i = 0; i < s->nb_streams; i++)
859 rt->real_setup[i] = s->streams[i]->discard;
860
861 if (!rt->need_subscription) {
862 if (memcmp (rt->real_setup, rt->real_setup_cache,
863 sizeof(enum AVDiscard) * s->nb_streams)) {
864 snprintf(cmd, sizeof(cmd),
865 "Unsubscribe: %s\r\n",
866 rt->last_subscription);
867 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
868 cmd, reply, NULL);
869 if (reply->status_code != RTSP_STATUS_OK)
870 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
871 rt->need_subscription = 1;
872 }
873 }
874
875 if (rt->need_subscription) {
876 int r, rule_nr, first = 1;
877
878 memcpy(rt->real_setup_cache, rt->real_setup,
879 sizeof(enum AVDiscard) * s->nb_streams);
880 rt->last_subscription[0] = 0;
881
882 snprintf(cmd, sizeof(cmd),
883 "Subscribe: ");
884 for (i = 0; i < rt->nb_rtsp_streams; i++) {
885 rule_nr = 0;
886 for (r = 0; r < s->nb_streams; r++) {
887 if (s->streams[r]->id == i) {
888 if (s->streams[r]->discard != AVDISCARD_ALL) {
889 if (!first)
890 av_strlcat(rt->last_subscription, ",",
891 sizeof(rt->last_subscription));
892 ff_rdt_subscribe_rule(
893 rt->last_subscription,
894 sizeof(rt->last_subscription), i, rule_nr);
895 first = 0;
896 }
897 rule_nr++;
898 }
899 }
900 }
901 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
902 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
903 cmd, reply, NULL);
904 if (reply->status_code != RTSP_STATUS_OK)
905 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
906 rt->need_subscription = 0;
907
908 if (rt->state == RTSP_STATE_STREAMING)
909 rtsp_read_play (s);
910 }
911 }
912
913 ret = ff_rtsp_fetch_packet(s, pkt);
914 if (ret < 0) {
915 if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
916 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
917 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
918 RTSPMessageHeader reply1, *reply = &reply1;
919 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
920 if (rtsp_read_pause(s) != 0)
921 return -1;
922 // TEARDOWN is required on Real-RTSP, but might make
923 // other servers close the connection.
924 if (rt->server_type == RTSP_SERVER_REAL)
925 ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
926 reply, NULL);
927 rt->session_id[0] = '\0';
928 if (resetup_tcp(s) == 0) {
929 rt->state = RTSP_STATE_IDLE;
930 rt->need_subscription = 1;
931 if (rtsp_read_play(s) != 0)
932 return -1;
933 goto retry;
934 }
935 }
936 }
937 return ret;
938 }
939 rt->packets++;
940
941 if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) {
942 /* send dummy request to keep TCP connection alive */
943 if ((av_gettime_relative() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
944 rt->auth_state.stale) {
945 if (rt->server_type == RTSP_SERVER_WMS ||
946 (rt->server_type != RTSP_SERVER_REAL &&
947 rt->get_parameter_supported)) {
948 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
949 } else {
950 ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL);
951 }
952 /* The stale flag should be reset when creating the auth response in
953 * ff_rtsp_send_cmd_async, but reset it here just in case we never
954 * called the auth code (if we didn't have any credentials set). */
955 rt->auth_state.stale = 0;
956 }
957 }
958
959 return 0;
960 }
961
962 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
963 int64_t timestamp, int flags)
964 {
965 RTSPState *rt = s->priv_data;
966 int ret;
967
968 rt->seek_timestamp = av_rescale_q(timestamp,
969 s->streams[stream_index]->time_base,
970 AV_TIME_BASE_Q);
971 switch(rt->state) {
972 default:
973 case RTSP_STATE_IDLE:
974 break;
975 case RTSP_STATE_STREAMING:
976 if ((ret = rtsp_read_pause(s)) != 0)
977 return ret;
978 rt->state = RTSP_STATE_SEEKING;
979 if ((ret = rtsp_read_play(s)) != 0)
980 return ret;
981 break;
982 case RTSP_STATE_PAUSED:
983 rt->state = RTSP_STATE_IDLE;
984 break;
985 }
986 return 0;
987 }
988
989 static const AVClass rtsp_demuxer_class = {
990 .class_name = "RTSP demuxer",
991 .item_name = av_default_item_name,
992 .option = ff_rtsp_options,
993 .version = LIBAVUTIL_VERSION_INT,
994 };
995
996 const FFInputFormat ff_rtsp_demuxer = {
997 .p.name = "rtsp",
998 .p.long_name = NULL_IF_CONFIG_SMALL("RTSP input"),
999 .p.flags = AVFMT_NOFILE,
1000 .p.priv_class = &rtsp_demuxer_class,
1001 .priv_data_size = sizeof(RTSPState),
1002 .read_probe = rtsp_probe,
1003 .read_header = rtsp_read_header,
1004 .read_packet = rtsp_read_packet,
1005 .read_close = rtsp_read_close,
1006 .read_seek = rtsp_read_seek,
1007 .read_play = rtsp_read_play,
1008 .read_pause = rtsp_read_pause,
1009 };
1010