--- /dev/null
+/*
+ * RTP network protocol
+ * Copyright (c) 2002 Fabrice Bellard.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include "avformat.h"
+
+#include <unistd.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#ifndef __BEOS__
+# include <arpa/inet.h>
+#else
+# include "barpainet.h"
+#endif
+#include <netdb.h>
+#include <fcntl.h>
+
+#define RTP_TX_BUF_SIZE (64 * 1024)
+#define RTP_RX_BUF_SIZE (128 * 1024)
+
+typedef struct RTPContext {
+ URLContext *rtp_hd, *rtcp_hd;
+ int rtp_fd, rtcp_fd;
+} RTPContext;
+
+/**
+ * If no filename is given to av_open_input_file because you want to
+ * get the local port first, then you must call this function to set
+ * the remote server address.
+ *
+ * @param s1 media file context
+ * @param uri of the remote server
+ * @return zero if no error.
+ */
+int rtp_set_remote_url(URLContext *h, const char *uri)
+{
+ RTPContext *s = h->priv_data;
+ char hostname[256];
+ int port;
+
+ char buf[1024];
+ char path[1024];
+
+ url_split(NULL, 0, hostname, sizeof(hostname), &port,
+ path, sizeof(path), uri);
+
+ snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
+ udp_set_remote_url(s->rtp_hd, buf);
+
+ snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
+ udp_set_remote_url(s->rtcp_hd, buf);
+ return 0;
+}
+
+
+/* add option to url of the form:
+ "http://host:port/path?option1=val1&option2=val2... */
+static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
+{
+ char buf1[1024];
+ va_list ap;
+
+ va_start(ap, fmt);
+ if (strchr(buf, '?'))
+ pstrcat(buf, buf_size, "&");
+ else
+ pstrcat(buf, buf_size, "?");
+ vsnprintf(buf1, sizeof(buf1), fmt, ap);
+ pstrcat(buf, buf_size, buf1);
+ va_end(ap);
+}
+
+static void build_udp_url(char *buf, int buf_size,
+ const char *hostname, int port,
+ int local_port, int multicast, int ttl)
+{
+ snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
+ if (local_port >= 0)
+ url_add_option(buf, buf_size, "localport=%d", local_port);
+ if (multicast)
+ url_add_option(buf, buf_size, "multicast=1", multicast);
+ if (ttl >= 0)
+ url_add_option(buf, buf_size, "ttl=%d", ttl);
+}
+
+/*
+ * url syntax: rtp://host:port[?option=val...]
+ * option: 'multicast=1' : enable multicast
+ * 'ttl=n' : set the ttl value (for multicast only)
+ * 'localport=n' : set the local port to n
+ *
+ */
+static int rtp_open(URLContext *h, const char *uri, int flags)
+{
+ RTPContext *s;
+ int port, is_output, is_multicast, ttl, local_port;
+ char hostname[256];
+ char buf[1024];
+ char path[1024];
+ const char *p;
+
+ is_output = (flags & URL_WRONLY);
+
+ s = av_mallocz(sizeof(RTPContext));
+ if (!s)
+ return -ENOMEM;
+ h->priv_data = s;
+
+ url_split(NULL, 0, hostname, sizeof(hostname), &port,
+ path, sizeof(path), uri);
+ /* extract parameters */
+ is_multicast = 0;
+ ttl = -1;
+ local_port = -1;
+ p = strchr(uri, '?');
+ if (p) {
+ is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
+ if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
+ ttl = strtol(buf, NULL, 10);
+ }
+ if (find_info_tag(buf, sizeof(buf), "localport", p)) {
+ local_port = strtol(buf, NULL, 10);
+ }
+ }
+
+ build_udp_url(buf, sizeof(buf),
+ hostname, port, local_port, is_multicast, ttl);
+ if (url_open(&s->rtp_hd, buf, flags) < 0)
+ goto fail;
+ local_port = udp_get_local_port(s->rtp_hd);
+ /* XXX: need to open another connexion if the port is not even */
+
+ /* well, should suppress localport in path */
+
+ build_udp_url(buf, sizeof(buf),
+ hostname, port + 1, local_port + 1, is_multicast, ttl);
+ if (url_open(&s->rtcp_hd, buf, flags) < 0)
+ goto fail;
+
+ /* just to ease handle access. XXX: need to suppress direct handle
+ access */
+ s->rtp_fd = udp_get_file_handle(s->rtp_hd);
+ s->rtcp_fd = udp_get_file_handle(s->rtcp_hd);
+
+ h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
+ h->is_streamed = 1;
+ return 0;
+
+ fail:
+ if (s->rtp_hd)
+ url_close(s->rtp_hd);
+ if (s->rtcp_hd)
+ url_close(s->rtcp_hd);
+ av_free(s);
+ return -EIO;
+}
+
+static int rtp_read(URLContext *h, uint8_t *buf, int size)
+{
+ RTPContext *s = h->priv_data;
+ struct sockaddr_in from;
+ int from_len, len, fd_max, n;
+ fd_set rfds;
+#if 0
+ for(;;) {
+ from_len = sizeof(from);
+ len = recvfrom (s->rtp_fd, buf, size, 0,
+ (struct sockaddr *)&from, &from_len);
+ if (len < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ continue;
+ return -EIO;
+ }
+ break;
+ }
+#else
+ for(;;) {
+ /* build fdset to listen to RTP and RTCP packets */
+ FD_ZERO(&rfds);
+ fd_max = s->rtp_fd;
+ FD_SET(s->rtp_fd, &rfds);
+ if (s->rtcp_fd > fd_max)
+ fd_max = s->rtcp_fd;
+ FD_SET(s->rtcp_fd, &rfds);
+ n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
+ if (n > 0) {
+ /* first try RTCP */
+ if (FD_ISSET(s->rtcp_fd, &rfds)) {
+ from_len = sizeof(from);
+ len = recvfrom (s->rtcp_fd, buf, size, 0,
+ (struct sockaddr *)&from, &from_len);
+ if (len < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ continue;
+ return -EIO;
+ }
+ break;
+ }
+ /* then RTP */
+ if (FD_ISSET(s->rtp_fd, &rfds)) {
+ from_len = sizeof(from);
+ len = recvfrom (s->rtp_fd, buf, size, 0,
+ (struct sockaddr *)&from, &from_len);
+ if (len < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ continue;
+ return -EIO;
+ }
+ break;
+ }
+ }
+ }
+#endif
+ return len;
+}
+
+static int rtp_write(URLContext *h, uint8_t *buf, int size)
+{
+ RTPContext *s = h->priv_data;
+ int ret;
+ URLContext *hd;
+
+ if (buf[1] >= 200 && buf[1] <= 204) {
+ /* RTCP payload type */
+ hd = s->rtcp_hd;
+ } else {
+ /* RTP payload type */
+ hd = s->rtp_hd;
+ }
+
+ ret = url_write(hd, buf, size);
+#if 0
+ {
+ struct timespec ts;
+ ts.tv_sec = 0;
+ ts.tv_nsec = 10 * 1000000;
+ nanosleep(&ts, NULL);
+ }
+#endif
+ return ret;
+}
+
+static int rtp_close(URLContext *h)
+{
+ RTPContext *s = h->priv_data;
+
+ url_close(s->rtp_hd);
+ url_close(s->rtcp_hd);
+ av_free(s);
+ return 0;
+}
+
+/**
+ * Return the local port used by the RTP connexion
+ * @param s1 media file context
+ * @return the local port number
+ */
+int rtp_get_local_port(URLContext *h)
+{
+ RTPContext *s = h->priv_data;
+ return udp_get_local_port(s->rtp_hd);
+}
+
+/**
+ * Return the rtp and rtcp file handles for select() usage to wait for several RTP
+ * streams at the same time.
+ * @param h media file context
+ */
+void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
+{
+ RTPContext *s = h->priv_data;
+
+ *prtp_fd = s->rtp_fd;
+ *prtcp_fd = s->rtcp_fd;
+}
+
+URLProtocol rtp_protocol = {
+ "rtp",
+ rtp_open,
+ rtp_read,
+ rtp_write,
+ NULL, /* seek */
+ rtp_close,
+};
projects / synfig.git / blobdiff