3 * Copyright (c) 2002 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "libavutil/parseutils.h"
28 #include "libavutil/avstring.h"
30 #include "avio_internal.h"
37 #include "os_support.h"
43 #define RTP_TX_BUF_SIZE (64 * 1024)
44 #define RTP_RX_BUF_SIZE (128 * 1024)
46 typedef struct RTPContext {
47 URLContext *rtp_hd, *rtcp_hd;
52 * If no filename is given to av_open_input_file because you want to
53 * get the local port first, then you must call this function to set
54 * the remote server address.
56 * @param h media file context
57 * @param uri of the remote server
58 * @return zero if no error.
61 int ff_rtp_set_remote_url(URLContext *h, const char *uri)
63 RTPContext *s = h->priv_data;
70 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
71 path, sizeof(path), uri);
73 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
74 ff_udp_set_remote_url(s->rtp_hd, buf);
76 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port + 1, "%s", path);
77 ff_udp_set_remote_url(s->rtcp_hd, buf);
83 * add option to url of the form:
84 * "http://host:port/path?option1=val1&option2=val2...
87 static av_printf_format(3, 4) void url_add_option(char *buf, int buf_size, const char *fmt, ...)
94 av_strlcat(buf, "&", buf_size);
96 av_strlcat(buf, "?", buf_size);
97 vsnprintf(buf1, sizeof(buf1), fmt, ap);
98 av_strlcat(buf, buf1, buf_size);
102 static void build_udp_url(char *buf, int buf_size,
103 const char *hostname, int port,
104 int local_port, int ttl,
105 int max_packet_size, int connect)
107 ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
109 url_add_option(buf, buf_size, "localport=%d", local_port);
111 url_add_option(buf, buf_size, "ttl=%d", ttl);
112 if (max_packet_size >=0)
113 url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
115 url_add_option(buf, buf_size, "connect=1");
119 * url syntax: rtp://host:port[?option=val...]
120 * option: 'ttl=n' : set the ttl value (for multicast only)
121 * 'rtcpport=n' : set the remote rtcp port to n
122 * 'localrtpport=n' : set the local rtp port to n
123 * 'localrtcpport=n' : set the local rtcp port to n
124 * 'pkt_size=n' : set max packet size
125 * 'connect=0/1' : do a connect() on the UDP socket
127 * 'localport=n' : set the local port to n
129 * if rtcpport isn't set the rtcp port will be the rtp port + 1
130 * if local rtp port isn't set any available port will be used for the local
132 * if the local rtcp port is not set it will be the local rtp port + 1
135 static int rtp_open(URLContext *h, const char *uri, int flags)
137 RTPContext *s = h->priv_data;
138 int rtp_port, rtcp_port,
140 local_rtp_port, local_rtcp_port, max_packet_size;
146 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
147 path, sizeof(path), uri);
148 /* extract parameters */
150 rtcp_port = rtp_port+1;
152 local_rtcp_port = -1;
153 max_packet_size = -1;
156 p = strchr(uri, '?');
158 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
159 ttl = strtol(buf, NULL, 10);
161 if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
162 rtcp_port = strtol(buf, NULL, 10);
164 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
165 local_rtp_port = strtol(buf, NULL, 10);
167 if (av_find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
168 local_rtp_port = strtol(buf, NULL, 10);
170 if (av_find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
171 local_rtcp_port = strtol(buf, NULL, 10);
173 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
174 max_packet_size = strtol(buf, NULL, 10);
176 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
177 connect = strtol(buf, NULL, 10);
181 build_udp_url(buf, sizeof(buf),
182 hostname, rtp_port, local_rtp_port, ttl, max_packet_size,
184 if (ffurl_open(&s->rtp_hd, buf, flags, &h->interrupt_callback, NULL) < 0)
186 if (local_rtp_port>=0 && local_rtcp_port<0)
187 local_rtcp_port = ff_udp_get_local_port(s->rtp_hd) + 1;
189 build_udp_url(buf, sizeof(buf),
190 hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
192 if (ffurl_open(&s->rtcp_hd, buf, flags, &h->interrupt_callback, NULL) < 0)
195 /* just to ease handle access. XXX: need to suppress direct handle
197 s->rtp_fd = ffurl_get_file_handle(s->rtp_hd);
198 s->rtcp_fd = ffurl_get_file_handle(s->rtcp_hd);
200 h->max_packet_size = s->rtp_hd->max_packet_size;
206 ffurl_close(s->rtp_hd);
208 ffurl_close(s->rtcp_hd);
212 static int rtp_read(URLContext *h, uint8_t *buf, int size)
214 RTPContext *s = h->priv_data;
215 struct sockaddr_storage from;
218 struct pollfd p[2] = {{s->rtp_fd, POLLIN, 0}, {s->rtcp_fd, POLLIN, 0}};
221 if (ff_check_interrupt(&h->interrupt_callback))
223 /* build fdset to listen to RTP and RTCP packets */
227 if (p[1].revents & POLLIN) {
228 from_len = sizeof(from);
229 len = recvfrom (s->rtcp_fd, buf, size, 0,
230 (struct sockaddr *)&from, &from_len);
232 if (ff_neterrno() == AVERROR(EAGAIN) ||
233 ff_neterrno() == AVERROR(EINTR))
240 if (p[0].revents & POLLIN) {
241 from_len = sizeof(from);
242 len = recvfrom (s->rtp_fd, buf, size, 0,
243 (struct sockaddr *)&from, &from_len);
245 if (ff_neterrno() == AVERROR(EAGAIN) ||
246 ff_neterrno() == AVERROR(EINTR))
253 if (ff_neterrno() == AVERROR(EINTR))
261 static int rtp_write(URLContext *h, const uint8_t *buf, int size)
263 RTPContext *s = h->priv_data;
267 if (RTP_PT_IS_RTCP(buf[1])) {
268 /* RTCP payload type */
271 /* RTP payload type */
275 ret = ffurl_write(hd, buf, size);
279 static int rtp_close(URLContext *h)
281 RTPContext *s = h->priv_data;
283 ffurl_close(s->rtp_hd);
284 ffurl_close(s->rtcp_hd);
289 * Return the local rtp port used by the RTP connection
290 * @param h media file context
291 * @return the local port number
294 int ff_rtp_get_local_rtp_port(URLContext *h)
296 RTPContext *s = h->priv_data;
297 return ff_udp_get_local_port(s->rtp_hd);
301 * Return the local rtcp port used by the RTP connection
302 * @param h media file context
303 * @return the local port number
306 int ff_rtp_get_local_rtcp_port(URLContext *h)
308 RTPContext *s = h->priv_data;
309 return ff_udp_get_local_port(s->rtcp_hd);
312 static int rtp_get_file_handle(URLContext *h)
314 RTPContext *s = h->priv_data;
318 static int rtp_get_multi_file_handle(URLContext *h, int **handles,
321 RTPContext *s = h->priv_data;
322 int *hs = *handles = av_malloc(sizeof(**handles) * 2);
324 return AVERROR(ENOMEM);
331 URLProtocol ff_rtp_protocol = {
333 .url_open = rtp_open,
334 .url_read = rtp_read,
335 .url_write = rtp_write,
336 .url_close = rtp_close,
337 .url_get_file_handle = rtp_get_file_handle,
338 .url_get_multi_file_handle = rtp_get_multi_file_handle,
339 .priv_data_size = sizeof(RTPContext),
340 .flags = URL_PROTOCOL_FLAG_NETWORK,