summaryrefslogtreecommitdiff
path: root/libavformat/rtspdec.c (plain)
blob: 0cb8f53a4cbacc187c460518bcbee56af61319d7
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
38static 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
56static 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
71static 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
96static 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[4096];
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
123static 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
141static inline int rtsp_read_request(AVFormatContext *s,
142 RTSPMessageHeader *request,
143 const char *method)
144{
145 RTSPState *rt = s->priv_data;
146 char rbuf[1024];
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
171static int rtsp_read_announce(AVFormatContext *s)
172{
173 RTSPState *rt = s->priv_data;
174 RTSPMessageHeader request = { 0 };
175 char sdp[4096];
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
212static 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
230static 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[1024];
236 RTSPStream *rtsp_st;
237 char responseheaders[1024];
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 if (request.transports[0].lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
278 rt->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
279 if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
280 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
281 return ret;
282 }
283 rtsp_st->interleaved_min = request.transports[0].interleaved_min;
284 rtsp_st->interleaved_max = request.transports[0].interleaved_max;
285 snprintf(responseheaders, sizeof(responseheaders), "Transport: "
286 "RTP/AVP/TCP;unicast;mode=receive;interleaved=%d-%d"
287 "\r\n", request.transports[0].interleaved_min,
288 request.transports[0].interleaved_max);
289 } else {
290 do {
291 AVDictionary *opts = NULL;
292 char buf[256];
293 snprintf(buf, sizeof(buf), "%d", rt->buffer_size);
294 av_dict_set(&opts, "buffer_size", buf, 0);
295 ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);
296 av_log(s, AV_LOG_TRACE, "Opening: %s", url);
297 ret = ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
298 &s->interrupt_callback, &opts,
299 s->protocol_whitelist, s->protocol_blacklist, NULL);
300 av_dict_free(&opts);
301 if (ret)
302 localport += 2;
303 } while (ret || localport > rt->rtp_port_max);
304 if (localport > rt->rtp_port_max) {
305 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
306 return ret;
307 }
308
309 av_log(s, AV_LOG_TRACE, "Listening on: %d",
310 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle));
311 if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
312 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
313 return ret;
314 }
315
316 localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
317 snprintf(responseheaders, sizeof(responseheaders), "Transport: "
318 "RTP/AVP/UDP;unicast;mode=receive;source=%s;"
319 "client_port=%d-%d;server_port=%d-%d\r\n",
320 host, request.transports[0].client_port_min,
321 request.transports[0].client_port_max, localport,
322 localport + 1);
323 }
324
325 /* Establish sessionid if not previously set */
326 /* Put this in a function? */
327 /* RFC 2326: session id must be at least 8 digits */
328 while (strlen(rt->session_id) < 8)
329 av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed());
330
331 av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
332 rt->session_id);
333 /* Send Reply */
334 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
335
336 rt->state = RTSP_STATE_PAUSED;
337 return 0;
338}
339
340static int rtsp_read_record(AVFormatContext *s)
341{
342 RTSPState *rt = s->priv_data;
343 RTSPMessageHeader request = { 0 };
344 int ret = 0;
345 char responseheaders[1024];
346
347 ret = rtsp_read_request(s, &request, "RECORD");
348 if (ret)
349 return ret;
350 ret = check_sessionid(s, &request);
351 if (ret)
352 return ret;
353 rt->seq++;
354 snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
355 rt->session_id);
356 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
357
358 rt->state = RTSP_STATE_STREAMING;
359 return 0;
360}
361
362static inline int parse_command_line(AVFormatContext *s, const char *line,
363 int linelen, char *uri, int urisize,
364 char *method, int methodsize,
365 enum RTSPMethod *methodcode)
366{
367 RTSPState *rt = s->priv_data;
368 const char *linept, *searchlinept;
369 linept = strchr(line, ' ');
370
371 if (!linept) {
372 av_log(s, AV_LOG_ERROR, "Error parsing method string\n");
373 return AVERROR_INVALIDDATA;
374 }
375
376 if (linept - line > methodsize - 1) {
377 av_log(s, AV_LOG_ERROR, "Method string too long\n");
378 return AVERROR(EIO);
379 }
380 memcpy(method, line, linept - line);
381 method[linept - line] = '\0';
382 linept++;
383 if (!strcmp(method, "ANNOUNCE"))
384 *methodcode = ANNOUNCE;
385 else if (!strcmp(method, "OPTIONS"))
386 *methodcode = OPTIONS;
387 else if (!strcmp(method, "RECORD"))
388 *methodcode = RECORD;
389 else if (!strcmp(method, "SETUP"))
390 *methodcode = SETUP;
391 else if (!strcmp(method, "PAUSE"))
392 *methodcode = PAUSE;
393 else if (!strcmp(method, "TEARDOWN"))
394 *methodcode = TEARDOWN;
395 else
396 *methodcode = UNKNOWN;
397 /* Check method with the state */
398 if (rt->state == RTSP_STATE_IDLE) {
399 if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) {
400 av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n",
401 line);
402 return AVERROR_PROTOCOL_NOT_FOUND;
403 }
404 } else if (rt->state == RTSP_STATE_PAUSED) {
405 if ((*methodcode != OPTIONS) && (*methodcode != RECORD)
406 && (*methodcode != SETUP)) {
407 av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n",
408 line);
409 return AVERROR_PROTOCOL_NOT_FOUND;
410 }
411 } else if (rt->state == RTSP_STATE_STREAMING) {
412 if ((*methodcode != PAUSE) && (*methodcode != OPTIONS)
413 && (*methodcode != TEARDOWN)) {
414 av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State"
415 " %s\n", line);
416 return AVERROR_PROTOCOL_NOT_FOUND;
417 }
418 } else {
419 av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state);
420 return AVERROR_BUG;
421 }
422
423 searchlinept = strchr(linept, ' ');
424 if (!searchlinept) {
425 av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
426 return AVERROR_INVALIDDATA;
427 }
428 if (searchlinept - linept > urisize - 1) {
429 av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n");
430 return AVERROR(EIO);
431 }
432 memcpy(uri, linept, searchlinept - linept);
433 uri[searchlinept - linept] = '\0';
434 if (strcmp(rt->control_uri, uri)) {
435 char host[128], path[512], auth[128];
436 int port;
437 char ctl_host[128], ctl_path[512], ctl_auth[128];
438 int ctl_port;
439 av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
440 path, sizeof(path), uri);
441 av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host,
442 sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path),
443 rt->control_uri);
444 if (strcmp(host, ctl_host))
445 av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n",
446 host, ctl_host);
447 if (strcmp(path, ctl_path) && *methodcode != SETUP)
448 av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected"
449 " %s\n", path, ctl_path);
450 if (*methodcode == ANNOUNCE) {
451 av_log(s, AV_LOG_INFO,
452 "Updating control URI to %s\n", uri);
453 av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri));
454 }
455 }
456
457 linept = searchlinept + 1;
458 if (!av_strstart(linept, "RTSP/1.0", NULL)) {
459 av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n");
460 return AVERROR_PROTOCOL_NOT_FOUND;
461 }
462 return 0;
463}
464
465int ff_rtsp_parse_streaming_commands(AVFormatContext *s)
466{
467 RTSPState *rt = s->priv_data;
468 unsigned char rbuf[4096];
469 unsigned char method[10];
470 char uri[500];
471 int ret;
472 int rbuflen = 0;
473 RTSPMessageHeader request = { 0 };
474 enum RTSPMethod methodcode;
475
476 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
477 if (ret < 0)
478 return ret;
479 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
480 sizeof(method), &methodcode);
481 if (ret) {
482 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
483 return ret;
484 }
485
486 ret = rtsp_read_request(s, &request, method);
487 if (ret)
488 return ret;
489 rt->seq++;
490 if (methodcode == PAUSE) {
491 rt->state = RTSP_STATE_PAUSED;
492 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
493 // TODO: Missing date header in response
494 } else if (methodcode == OPTIONS) {
495 ret = rtsp_send_reply(s, RTSP_STATUS_OK,
496 "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, "
497 "RECORD\r\n", request.seq);
498 } else if (methodcode == TEARDOWN) {
499 rt->state = RTSP_STATE_IDLE;
500 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
501 return 0;
502 }
503 return ret;
504}
505
506static int rtsp_read_play(AVFormatContext *s)
507{
508 RTSPState *rt = s->priv_data;
509 RTSPMessageHeader reply1, *reply = &reply1;
510 int i;
511 char cmd[1024];
512
513 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
514 rt->nb_byes = 0;
515
516 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
517 for (i = 0; i < rt->nb_rtsp_streams; i++) {
518 RTSPStream *rtsp_st = rt->rtsp_streams[i];
519 /* Try to initialize the connection state in a
520 * potential NAT router by sending dummy packets.
521 * RTP/RTCP dummy packets are used for RDT, too.
522 */
523 if (rtsp_st->rtp_handle &&
524 !(rt->server_type == RTSP_SERVER_WMS && i > 1))
525 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);
526 }
527 }
528 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
529 if (rt->transport == RTSP_TRANSPORT_RTP) {
530 for (i = 0; i < rt->nb_rtsp_streams; i++) {
531 RTSPStream *rtsp_st = rt->rtsp_streams[i];
532 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
533 if (!rtpctx)
534 continue;
535 ff_rtp_reset_packet_queue(rtpctx);
536 rtpctx->last_rtcp_ntp_time = AV_NOPTS_VALUE;
537 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
538 rtpctx->base_timestamp = 0;
539 rtpctx->timestamp = 0;
540 rtpctx->unwrapped_timestamp = 0;
541 rtpctx->rtcp_ts_offset = 0;
542 }
543 }
544 if (rt->state == RTSP_STATE_PAUSED) {
545 cmd[0] = 0;
546 } else {
547 snprintf(cmd, sizeof(cmd),
548 "Range: npt=%"PRId64".%03"PRId64"-\r\n",
549 rt->seek_timestamp / AV_TIME_BASE,
550 rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
551 }
552 ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
553 if (reply->status_code != RTSP_STATUS_OK) {
554 return ff_rtsp_averror(reply->status_code, -1);
555 }
556 if (rt->transport == RTSP_TRANSPORT_RTP &&
557 reply->range_start != AV_NOPTS_VALUE) {
558 for (i = 0; i < rt->nb_rtsp_streams; i++) {
559 RTSPStream *rtsp_st = rt->rtsp_streams[i];
560 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
561 AVStream *st = NULL;
562 if (!rtpctx || rtsp_st->stream_index < 0)
563 continue;
564
565 st = s->streams[rtsp_st->stream_index];
566 rtpctx->range_start_offset =
567 av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
568 st->time_base);
569 }
570 }
571 }
572 rt->state = RTSP_STATE_STREAMING;
573 return 0;
574}
575
576/* pause the stream */
577static int rtsp_read_pause(AVFormatContext *s)
578{
579 RTSPState *rt = s->priv_data;
580 RTSPMessageHeader reply1, *reply = &reply1;
581
582 if (rt->state != RTSP_STATE_STREAMING)
583 return 0;
584 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
585 ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
586 if (reply->status_code != RTSP_STATUS_OK) {
587 return ff_rtsp_averror(reply->status_code, -1);
588 }
589 }
590 rt->state = RTSP_STATE_PAUSED;
591 return 0;
592}
593
594int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
595{
596 RTSPState *rt = s->priv_data;
597 char cmd[1024];
598 unsigned char *content = NULL;
599 int ret;
600
601 /* describe the stream */
602 snprintf(cmd, sizeof(cmd),
603 "Accept: application/sdp\r\n");
604 if (rt->server_type == RTSP_SERVER_REAL) {
605 /**
606 * The Require: attribute is needed for proper streaming from
607 * Realmedia servers.
608 */
609 av_strlcat(cmd,
610 "Require: com.real.retain-entity-for-setup\r\n",
611 sizeof(cmd));
612 }
613 ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
614 if (reply->status_code != RTSP_STATUS_OK) {
615 av_freep(&content);
616 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
617 }
618 if (!content)
619 return AVERROR_INVALIDDATA;
620
621 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
622 /* now we got the SDP description, we parse it */
623 ret = ff_sdp_parse(s, (const char *)content);
624 av_freep(&content);
625 if (ret < 0)
626 return ret;
627
628 return 0;
629}
630
631static int rtsp_listen(AVFormatContext *s)
632{
633 RTSPState *rt = s->priv_data;
634 char proto[128], host[128], path[512], auth[128];
635 char uri[500];
636 int port;
637 int default_port = RTSP_DEFAULT_PORT;
638 char tcpname[500];
639 const char *lower_proto = "tcp";
640 unsigned char rbuf[4096];
641 unsigned char method[10];
642 int rbuflen = 0;
643 int ret;
644 enum RTSPMethod methodcode;
645
646 /* extract hostname and port */
647 av_url_split(proto, sizeof(proto), auth, sizeof(auth), host, sizeof(host),
648 &port, path, sizeof(path), s->filename);
649
650 /* ff_url_join. No authorization by now (NULL) */
651 ff_url_join(rt->control_uri, sizeof(rt->control_uri), proto, NULL, host,
652 port, "%s", path);
653
654 if (!strcmp(proto, "rtsps")) {
655 lower_proto = "tls";
656 default_port = RTSPS_DEFAULT_PORT;
657 }
658
659 if (port < 0)
660 port = default_port;
661
662 /* Create TCP connection */
663 ff_url_join(tcpname, sizeof(tcpname), lower_proto, NULL, host, port,
664 "?listen&listen_timeout=%d", rt->initial_timeout * 1000);
665
666 if (ret = ffurl_open_whitelist(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
667 &s->interrupt_callback, NULL,
668 s->protocol_whitelist, s->protocol_blacklist, NULL)) {
669 av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n");
670 return ret;
671 }
672 rt->state = RTSP_STATE_IDLE;
673 rt->rtsp_hd_out = rt->rtsp_hd;
674 for (;;) { /* Wait for incoming RTSP messages */
675 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
676 if (ret < 0)
677 return ret;
678 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
679 sizeof(method), &methodcode);
680 if (ret) {
681 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
682 return ret;
683 }
684
685 if (methodcode == ANNOUNCE) {
686 ret = rtsp_read_announce(s);
687 rt->state = RTSP_STATE_PAUSED;
688 } else if (methodcode == OPTIONS) {
689 ret = rtsp_read_options(s);
690 } else if (methodcode == RECORD) {
691 ret = rtsp_read_record(s);
692 if (!ret)
693 return 0; // We are ready for streaming
694 } else if (methodcode == SETUP)
695 ret = rtsp_read_setup(s, host, uri);
696 if (ret) {
697 ffurl_close(rt->rtsp_hd);
698 return AVERROR_INVALIDDATA;
699 }
700 }
701}
702
703static int rtsp_probe(AVProbeData *p)
704{
705 if (
706#if CONFIG_TLS_PROTOCOL
707 av_strstart(p->filename, "rtsps:", NULL) ||
708#endif
709 av_strstart(p->filename, "rtsp:", NULL))
710 return AVPROBE_SCORE_MAX;
711 return 0;
712}
713
714static int rtsp_read_header(AVFormatContext *s)
715{
716 RTSPState *rt = s->priv_data;
717 int ret;
718
719 if (rt->initial_timeout > 0)
720 rt->rtsp_flags |= RTSP_FLAG_LISTEN;
721
722 if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
723 ret = rtsp_listen(s);
724 if (ret)
725 return ret;
726 } else {
727 ret = ff_rtsp_connect(s);
728 if (ret)
729 return ret;
730
731 rt->real_setup_cache = !s->nb_streams ? NULL :
732 av_mallocz_array(s->nb_streams, 2 * sizeof(*rt->real_setup_cache));
733 if (!rt->real_setup_cache && s->nb_streams)
734 return AVERROR(ENOMEM);
735 rt->real_setup = rt->real_setup_cache + s->nb_streams;
736
737 if (rt->initial_pause) {
738 /* do not start immediately */
739 } else {
740 if ((ret = rtsp_read_play(s)) < 0) {
741 ff_rtsp_close_streams(s);
742 ff_rtsp_close_connections(s);
743 return ret;
744 }
745 }
746 }
747
748 return 0;
749}
750
751int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
752 uint8_t *buf, int buf_size)
753{
754 RTSPState *rt = s->priv_data;
755 int id, len, i, ret;
756 RTSPStream *rtsp_st;
757
758 av_log(s, AV_LOG_TRACE, "tcp_read_packet:\n");
759redo:
760 for (;;) {
761 RTSPMessageHeader reply;
762
763 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
764 if (ret < 0)
765 return ret;
766 if (ret == 1) /* received '$' */
767 break;
768 /* XXX: parse message */
769 if (rt->state != RTSP_STATE_STREAMING)
770 return 0;
771 }
772 ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
773 if (ret != 3)
774 return -1;
775 id = buf[0];
776 len = AV_RB16(buf + 1);
777 av_log(s, AV_LOG_TRACE, "id=%d len=%d\n", id, len);
778 if (len > buf_size || len < 8)
779 goto redo;
780 /* get the data */
781 ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
782 if (ret != len)
783 return -1;
784 if (rt->transport == RTSP_TRANSPORT_RDT &&
785 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
786 return -1;
787
788 /* find the matching stream */
789 for (i = 0; i < rt->nb_rtsp_streams; i++) {
790 rtsp_st = rt->rtsp_streams[i];
791 if (id >= rtsp_st->interleaved_min &&
792 id <= rtsp_st->interleaved_max)
793 goto found;
794 }
795 goto redo;
796found:
797 *prtsp_st = rtsp_st;
798 return len;
799}
800
801static int resetup_tcp(AVFormatContext *s)
802{
803 RTSPState *rt = s->priv_data;
804 char host[1024];
805 int port;
806
807 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
808 s->filename);
809 ff_rtsp_undo_setup(s, 0);
810 return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
811 rt->real_challenge);
812}
813
814static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
815{
816 RTSPState *rt = s->priv_data;
817 int ret;
818 RTSPMessageHeader reply1, *reply = &reply1;
819 char cmd[1024];
820
821retry:
822 if (rt->server_type == RTSP_SERVER_REAL) {
823 int i;
824
825 for (i = 0; i < s->nb_streams; i++)
826 rt->real_setup[i] = s->streams[i]->discard;
827
828 if (!rt->need_subscription) {
829 if (memcmp (rt->real_setup, rt->real_setup_cache,
830 sizeof(enum AVDiscard) * s->nb_streams)) {
831 snprintf(cmd, sizeof(cmd),
832 "Unsubscribe: %s\r\n",
833 rt->last_subscription);
834 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
835 cmd, reply, NULL);
836 if (reply->status_code != RTSP_STATUS_OK)
837 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
838 rt->need_subscription = 1;
839 }
840 }
841
842 if (rt->need_subscription) {
843 int r, rule_nr, first = 1;
844
845 memcpy(rt->real_setup_cache, rt->real_setup,
846 sizeof(enum AVDiscard) * s->nb_streams);
847 rt->last_subscription[0] = 0;
848
849 snprintf(cmd, sizeof(cmd),
850 "Subscribe: ");
851 for (i = 0; i < rt->nb_rtsp_streams; i++) {
852 rule_nr = 0;
853 for (r = 0; r < s->nb_streams; r++) {
854 if (s->streams[r]->id == i) {
855 if (s->streams[r]->discard != AVDISCARD_ALL) {
856 if (!first)
857 av_strlcat(rt->last_subscription, ",",
858 sizeof(rt->last_subscription));
859 ff_rdt_subscribe_rule(
860 rt->last_subscription,
861 sizeof(rt->last_subscription), i, rule_nr);
862 first = 0;
863 }
864 rule_nr++;
865 }
866 }
867 }
868 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
869 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
870 cmd, reply, NULL);
871 if (reply->status_code != RTSP_STATUS_OK)
872 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
873 rt->need_subscription = 0;
874
875 if (rt->state == RTSP_STATE_STREAMING)
876 rtsp_read_play (s);
877 }
878 }
879
880 ret = ff_rtsp_fetch_packet(s, pkt);
881 if (ret < 0) {
882 if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
883 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
884 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
885 RTSPMessageHeader reply1, *reply = &reply1;
886 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
887 if (rtsp_read_pause(s) != 0)
888 return -1;
889 // TEARDOWN is required on Real-RTSP, but might make
890 // other servers close the connection.
891 if (rt->server_type == RTSP_SERVER_REAL)
892 ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
893 reply, NULL);
894 rt->session_id[0] = '\0';
895 if (resetup_tcp(s) == 0) {
896 rt->state = RTSP_STATE_IDLE;
897 rt->need_subscription = 1;
898 if (rtsp_read_play(s) != 0)
899 return -1;
900 goto retry;
901 }
902 }
903 }
904 return ret;
905 }
906 rt->packets++;
907
908 if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) {
909 /* send dummy request to keep TCP connection alive */
910 if ((av_gettime_relative() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
911 rt->auth_state.stale) {
912 if (rt->server_type == RTSP_SERVER_WMS ||
913 (rt->server_type != RTSP_SERVER_REAL &&
914 rt->get_parameter_supported)) {
915 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
916 } else {
917 ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL);
918 }
919 /* The stale flag should be reset when creating the auth response in
920 * ff_rtsp_send_cmd_async, but reset it here just in case we never
921 * called the auth code (if we didn't have any credentials set). */
922 rt->auth_state.stale = 0;
923 }
924 }
925
926 return 0;
927}
928
929static int rtsp_read_seek(AVFormatContext *s, int stream_index,
930 int64_t timestamp, int flags)
931{
932 RTSPState *rt = s->priv_data;
933 int ret;
934
935 rt->seek_timestamp = av_rescale_q(timestamp,
936 s->streams[stream_index]->time_base,
937 AV_TIME_BASE_Q);
938 switch(rt->state) {
939 default:
940 case RTSP_STATE_IDLE:
941 break;
942 case RTSP_STATE_STREAMING:
943 if ((ret = rtsp_read_pause(s)) != 0)
944 return ret;
945 rt->state = RTSP_STATE_SEEKING;
946 if ((ret = rtsp_read_play(s)) != 0)
947 return ret;
948 break;
949 case RTSP_STATE_PAUSED:
950 rt->state = RTSP_STATE_IDLE;
951 break;
952 }
953 return 0;
954}
955
956static const AVClass rtsp_demuxer_class = {
957 .class_name = "RTSP demuxer",
958 .item_name = av_default_item_name,
959 .option = ff_rtsp_options,
960 .version = LIBAVUTIL_VERSION_INT,
961};
962
963AVInputFormat ff_rtsp_demuxer = {
964 .name = "rtsp",
965 .long_name = NULL_IF_CONFIG_SMALL("RTSP input"),
966 .priv_data_size = sizeof(RTSPState),
967 .read_probe = rtsp_probe,
968 .read_header = rtsp_read_header,
969 .read_packet = rtsp_read_packet,
970 .read_close = rtsp_read_close,
971 .read_seek = rtsp_read_seek,
972 .flags = AVFMT_NOFILE,
973 .read_play = rtsp_read_play,
974 .read_pause = rtsp_read_pause,
975 .priv_class = &rtsp_demuxer_class,
976};
977
generated by cgit at 2024-05-17 06:08:07 (GMT)