Initial revision

Originally committed as revision 5 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 148 insertions, 0 deletions

diff --git a/libav/udp.c b/libav/udp.c
new file mode 100644
index 0000000000..329653bf18
--- /dev/null
+++ b/libav/udp.c
@@ -0,0 +1,148 @@
+/*
+ * UDP prototype streaming system
+ * Copyright (c) 2000 Gerard Lantau.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+#include "avformat.h"
+
+typedef struct {
+    int udp_socket;
+    int max_payload_size; /* in bytes */
+} UDPContext;
+
+#define UDP_TX_BUF_SIZE 32768
+
+/* put it in UDP context */
+static struct sockaddr_in dest_addr;
+
+/* return non zero if error */
+static int udp_open(URLContext *h, const char *uri, int flags)
+{
+    int local_port = 0;
+    struct sockaddr_in my_addr;
+    const char *p, *q;
+    char hostname[1024];
+    int port, udp_socket, tmp;
+    struct hostent *hp;
+    UDPContext *s;
+
+    h->is_streamed = 1;
+
+    if (!(flags & URL_WRONLY))
+        return -EIO;
+    
+    /* fill the dest addr */
+    p = uri;
+    if (!strstart(p, "udp:", &p))
+        return -1;
+    q = strchr(p, ':');
+    if (!q)
+        return -1;
+    memcpy(hostname, p, q - p);
+    hostname[q - p] = '\0';
+    port = strtol(q+1, NULL, 10);
+    if (port <= 0)
+        return -1;
+
+    dest_addr.sin_family = AF_INET;
+    dest_addr.sin_port = htons(port);
+    if ((inet_aton(hostname, &dest_addr.sin_addr)) == 0) {
+        hp = gethostbyname(hostname);
+        if (!hp)
+            return -1;
+        memcpy ((char *) &dest_addr.sin_addr, hp->h_addr, hp->h_length);
+    }
+    
+    udp_socket = socket(PF_INET, SOCK_DGRAM, 0);
+    if (udp_socket < 0)
+        return -1;
+
+    my_addr.sin_family = AF_INET;
+    my_addr.sin_port = htons(local_port);
+    my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
+
+    /* the bind is needed to give a port to the socket now */
+    if (bind(udp_socket,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0) 
+        goto fail;
+
+    /* limit the tx buf size to limit latency */
+
+    tmp = UDP_TX_BUF_SIZE;
+    if (setsockopt(udp_socket, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
+        perror("setsockopt sndbuf");
+        goto fail;
+    }
+
+    s = malloc(sizeof(UDPContext));
+    if (!s)
+        return -ENOMEM;
+    h->priv_data = s;
+    s->udp_socket = udp_socket;
+    h->packet_size = 1500;
+    return 0;
+ fail:
+    return -EIO;
+}
+
+int udp_close(URLContext *h)
+{
+    UDPContext *s = h->priv_data;
+    close(s->udp_socket);
+    return 0;
+}
+
+int udp_write(URLContext *h, UINT8 *buf, int size)
+{
+    UDPContext *s = h->priv_data;
+    int ret, len, size1;
+
+    /* primitive way to avoid big packets */
+    size1 = size;
+    while (size > 0) {
+        len = size;
+        if (len > h->packet_size)
+            len = h->packet_size;
+        
+        ret = sendto (s->udp_socket, buf, len, 0, 
+                      (struct sockaddr *) &dest_addr,
+                      sizeof (dest_addr));
+        if (ret < 0)
+            perror("sendto");
+        buf += len;
+        size -= len;
+    }
+    return size1 - size;
+}
+
+URLProtocol udp_protocol = {
+    "udp",
+    udp_open,
+    NULL, /* read */
+    udp_write,
+    NULL, /* seek */
+    udp_close,
+};