3 * Copyright (c) 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
27 #include "libavutil/parseutils.h"
28 #include "libavutil/avstring.h"
30 #include "avio_internal.h"
38 #include "os_support.h"
45 #define RTP_TX_BUF_SIZE (64 * 1024)
46 #define RTP_RX_BUF_SIZE (128 * 1024)
48 typedef struct RTPContext {
49 URLContext *rtp_hd, *rtcp_hd;
54 * If no filename is given to av_open_input_file because you want to
55 * get the local port first, then you must call this function to set
56 * the remote server address.
58 * @param h media file context
59 * @param uri of the remote server
60 * @return zero if no error.
63 int rtp_set_remote_url(URLContext *h, const char *uri)
65 RTPContext *s = h->priv_data;
72 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
73 path, sizeof(path), uri);
75 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
76 ff_udp_set_remote_url(s->rtp_hd, buf);
78 ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port + 1, "%s", path);
79 ff_udp_set_remote_url(s->rtcp_hd, buf);
85 * add option to url of the form:
86 * "http://host:port/path?option1=val1&option2=val2...
89 static av_printf_format(3, 4) void url_add_option(char *buf, int buf_size, const char *fmt, ...)
96 av_strlcat(buf, "&", buf_size);
98 av_strlcat(buf, "?", buf_size);
99 vsnprintf(buf1, sizeof(buf1), fmt, ap);
100 av_strlcat(buf, buf1, buf_size);
104 static void build_udp_url(char *buf, int buf_size,
105 const char *hostname, int port,
106 int local_port, int ttl,
107 int max_packet_size, int connect)
109 ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
111 url_add_option(buf, buf_size, "localport=%d", local_port);
113 url_add_option(buf, buf_size, "ttl=%d", ttl);
114 if (max_packet_size >=0)
115 url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
117 url_add_option(buf, buf_size, "connect=1");
118 url_add_option(buf, buf_size, "fifo_size=0");
122 * url syntax: rtp://host:port[?option=val...]
123 * option: 'ttl=n' : set the ttl value (for multicast only)
124 * 'rtcpport=n' : set the remote rtcp port to n
125 * 'localrtpport=n' : set the local rtp port to n
126 * 'localrtcpport=n' : set the local rtcp port to n
127 * 'pkt_size=n' : set max packet size
128 * 'connect=0/1' : do a connect() on the UDP socket
130 * 'localport=n' : set the local port to n
132 * if rtcpport isn't set the rtcp port will be the rtp port + 1
133 * if local rtp port isn't set any available port will be used for the local
135 * if the local rtcp port is not set it will be the local rtp port + 1
138 static int rtp_open(URLContext *h, const char *uri, int flags)
141 int rtp_port, rtcp_port,
143 local_rtp_port, local_rtcp_port, max_packet_size;
149 s = av_mallocz(sizeof(RTPContext));
151 return AVERROR(ENOMEM);
154 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
155 path, sizeof(path), uri);
156 /* extract parameters */
158 rtcp_port = rtp_port+1;
160 local_rtcp_port = -1;
161 max_packet_size = -1;
164 p = strchr(uri, '?');
166 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
167 ttl = strtol(buf, NULL, 10);
169 if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
170 rtcp_port = strtol(buf, NULL, 10);
172 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
173 local_rtp_port = strtol(buf, NULL, 10);
175 if (av_find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
176 local_rtp_port = strtol(buf, NULL, 10);
178 if (av_find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
179 local_rtcp_port = strtol(buf, NULL, 10);
181 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
182 max_packet_size = strtol(buf, NULL, 10);
184 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
185 connect = strtol(buf, NULL, 10);
189 build_udp_url(buf, sizeof(buf),
190 hostname, rtp_port, local_rtp_port, ttl, max_packet_size,
192 if (ffurl_open(&s->rtp_hd, buf, flags) < 0)
194 if (local_rtp_port>=0 && local_rtcp_port<0)
195 local_rtcp_port = ff_udp_get_local_port(s->rtp_hd) + 1;
197 build_udp_url(buf, sizeof(buf),
198 hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
200 if (ffurl_open(&s->rtcp_hd, buf, flags) < 0)
203 /* just to ease handle access. XXX: need to suppress direct handle
205 s->rtp_fd = ffurl_get_file_handle(s->rtp_hd);
206 s->rtcp_fd = ffurl_get_file_handle(s->rtcp_hd);
208 h->max_packet_size = s->rtp_hd->max_packet_size;
214 ffurl_close(s->rtp_hd);
216 ffurl_close(s->rtcp_hd);
221 static int rtp_read(URLContext *h, uint8_t *buf, int size)
223 RTPContext *s = h->priv_data;
224 struct sockaddr_storage from;
227 struct pollfd p[2] = {{s->rtp_fd, POLLIN, 0}, {s->rtcp_fd, POLLIN, 0}};
230 if (url_interrupt_cb())
232 /* build fdset to listen to RTP and RTCP packets */
236 if (p[1].revents & POLLIN) {
237 from_len = sizeof(from);
238 len = recvfrom (s->rtcp_fd, buf, size, 0,
239 (struct sockaddr *)&from, &from_len);
241 if (ff_neterrno() == AVERROR(EAGAIN) ||
242 ff_neterrno() == AVERROR(EINTR))
249 if (p[0].revents & POLLIN) {
250 from_len = sizeof(from);
251 len = recvfrom (s->rtp_fd, buf, size, 0,
252 (struct sockaddr *)&from, &from_len);
254 if (ff_neterrno() == AVERROR(EAGAIN) ||
255 ff_neterrno() == AVERROR(EINTR))
262 if (ff_neterrno() == AVERROR(EINTR))
270 static int rtp_write(URLContext *h, const uint8_t *buf, int size)
272 RTPContext *s = h->priv_data;
276 if (buf[1] >= RTCP_SR && buf[1] <= RTCP_APP) {
277 /* RTCP payload type */
280 /* RTP payload type */
284 ret = ffurl_write(hd, buf, size);
288 static int rtp_close(URLContext *h)
290 RTPContext *s = h->priv_data;
292 ffurl_close(s->rtp_hd);
293 ffurl_close(s->rtcp_hd);
299 * Return the local rtp port used by the RTP connection
300 * @param h media file context
301 * @return the local port number
304 int rtp_get_local_rtp_port(URLContext *h)
306 RTPContext *s = h->priv_data;
307 return ff_udp_get_local_port(s->rtp_hd);
311 * Return the local rtcp port used by the RTP connection
312 * @param h media file context
313 * @return the local port number
316 int rtp_get_local_rtcp_port(URLContext *h)
318 RTPContext *s = h->priv_data;
319 return ff_udp_get_local_port(s->rtcp_hd);
322 static int rtp_get_file_handle(URLContext *h)
324 RTPContext *s = h->priv_data;
328 int rtp_get_rtcp_file_handle(URLContext *h) {
329 RTPContext *s = h->priv_data;
333 URLProtocol ff_rtp_protocol = {
335 .url_open = rtp_open,
336 .url_read = rtp_read,
337 .url_write = rtp_write,
338 .url_close = rtp_close,
339 .url_get_file_handle = rtp_get_file_handle,