renamed libav to libavformat

Originally committed as revision 1276 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 272 insertions, 0 deletions

diff --git a/libavformat/udp.c b/libavformat/udp.c
new file mode 100644
index 0000000000..3d159ef4f8
--- /dev/null
+++ b/libavformat/udp.c
@@ -0,0 +1,272 @@
+/*
+ * UDP prototype streaming system
+ * Copyright (c) 2000, 2001, 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 <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>
+
+typedef struct {
+    int udp_fd;
+    int ttl;
+    int is_multicast;
+    int local_port;
+    struct ip_mreq mreq;
+    struct sockaddr_in dest_addr;
+} UDPContext;
+
+#define UDP_TX_BUF_SIZE 32768
+
+/**
+ * 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.
+ *
+ * url syntax: udp://host:port[?option=val...]
+ * option: 'multicast=1' : enable multicast 
+ *         'ttl=n'       : set the ttl value (for multicast only)
+ *         'localport=n' : set the local port
+ *
+ * @param s1 media file context
+ * @param uri of the remote server
+ * @return zero if no error.
+ */
+int udp_set_remote_url(URLContext *h, const char *uri)
+{
+    UDPContext *s = h->priv_data;
+    char hostname[256];
+    int port;
+    
+    url_split(NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
+
+    /* set the destination address */
+    if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
+        return -EIO;
+    s->dest_addr.sin_family = AF_INET;
+    s->dest_addr.sin_port = htons(port);
+    return 0;
+}
+
+/**
+ * Return the local port used by the UDP connexion
+ * @param s1 media file context
+ * @return the local port number
+ */
+int udp_get_local_port(URLContext *h)
+{
+    UDPContext *s = h->priv_data;
+    return s->local_port;
+}
+
+/**
+ * Return the udp file handle for select() usage to wait for several RTP
+ * streams at the same time.
+ * @param h media file context
+ */
+int udp_get_file_handle(URLContext *h)
+{
+    UDPContext *s = h->priv_data;
+    return s->udp_fd;
+}
+
+/* put it in UDP context */
+/* return non zero if error */
+static int udp_open(URLContext *h, const char *uri, int flags)
+{
+    struct sockaddr_in my_addr, my_addr1;
+    char hostname[1024];
+    int port, udp_fd = -1, tmp;
+    UDPContext *s = NULL;
+    int is_output, len;
+    const char *p;
+    char buf[256];
+
+    h->is_streamed = 1;
+
+    is_output = (flags & URL_WRONLY);
+    
+    s = av_malloc(sizeof(UDPContext));
+    if (!s)
+        return -ENOMEM;
+
+    h->priv_data = s;
+    s->ttl = 16;
+    s->is_multicast = 0;
+    p = strchr(uri, '?');
+    if (p) {
+        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
+        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
+            s->ttl = strtol(buf, NULL, 10);
+        }
+        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
+            s->local_port = strtol(buf, NULL, 10);
+        }
+    }
+
+    /* fill the dest addr */
+    url_split(NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
+    
+    /* XXX: fix url_split */
+    if (hostname[0] == '\0' || hostname[0] == '?') {
+        /* only accepts null hostname if input */
+        if (s->is_multicast || (flags & URL_WRONLY))
+            goto fail;
+    } else {
+        udp_set_remote_url(h, uri);
+    }
+
+    udp_fd = socket(PF_INET, SOCK_DGRAM, 0);
+    if (udp_fd < 0)
+        goto fail;
+
+    my_addr.sin_family = AF_INET;
+    my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
+    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
+        /* special case: the bind must be done on the multicast address port */
+        my_addr.sin_port = s->dest_addr.sin_port;
+    } else {
+        my_addr.sin_port = htons(s->local_port);
+    }
+
+    /* the bind is needed to give a port to the socket now */
+    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0) 
+        goto fail;
+
+    len = sizeof(my_addr1);
+    getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
+    s->local_port = ntohs(my_addr1.sin_port);
+
+#ifndef CONFIG_BEOS_NETSERVER
+    if (s->is_multicast) {
+        if (h->flags & URL_WRONLY) {
+            /* output */
+            if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL, 
+                           &s->ttl, sizeof(s->ttl)) < 0) {
+                perror("IP_MULTICAST_TTL");
+                goto fail;
+            }
+        } else {
+            /* input */
+            memset(&s->mreq, 0, sizeof(s->mreq));
+            s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
+            s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
+            if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, 
+                           &s->mreq, sizeof(s->mreq)) < 0) {
+                perror("rtp: IP_ADD_MEMBERSHIP");
+                goto fail;
+            }
+        }
+    }
+#endif
+
+    if (is_output) {
+        /* limit the tx buf size to limit latency */
+        tmp = UDP_TX_BUF_SIZE;
+        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
+            perror("setsockopt sndbuf");
+            goto fail;
+        }
+    }
+
+    s->udp_fd = udp_fd;
+    h->max_packet_size = 1472; /* XXX: probe it ? */
+    return 0;
+ fail:
+    if (udp_fd >= 0)
+#ifdef CONFIG_BEOS_NETSERVER
+        closesocket(udp_fd);
+#else
+        close(udp_fd);
+#endif
+    av_free(s);
+    return -EIO;
+}
+
+static int udp_read(URLContext *h, UINT8 *buf, int size)
+{
+    UDPContext *s = h->priv_data;
+    struct sockaddr_in from;
+    int from_len, len;
+
+    for(;;) {
+        from_len = sizeof(from);
+        len = recvfrom (s->udp_fd, buf, size, 0,
+                        (struct sockaddr *)&from, &from_len);
+        if (len < 0) {
+            if (errno != EAGAIN && errno != EINTR)
+                return -EIO;
+        } else {
+            break;
+        }
+    }
+    return len;
+}
+
+static int udp_write(URLContext *h, UINT8 *buf, int size)
+{
+    UDPContext *s = h->priv_data;
+    int ret;
+
+    for(;;) {
+        ret = sendto (s->udp_fd, buf, size, 0, 
+                      (struct sockaddr *) &s->dest_addr,
+                      sizeof (s->dest_addr));
+        if (ret < 0) {
+            if (errno != EINTR && errno != EAGAIN)
+                return -EIO;
+        } else {
+            break;
+        }
+    }
+    return size;
+}
+
+static int udp_close(URLContext *h)
+{
+    UDPContext *s = h->priv_data;
+
+#ifndef CONFIG_BEOS_NETSERVER
+    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
+        if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, 
+                       &s->mreq, sizeof(s->mreq)) < 0) {
+            perror("IP_DROP_MEMBERSHIP");
+        }
+    }
+    close(s->udp_fd);
+#else
+    closesocket(s->udp_fd);
+#endif
+    av_free(s);
+    return 0;
+}
+
+URLProtocol udp_protocol = {
+    "udp",
+    udp_open,
+    udp_read,
+    udp_write,
+    NULL, /* seek */
+    udp_close,
+};