Initial revision

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

1 files changed, 146 insertions, 0 deletions

diff --git a/libav/avio.c b/libav/avio.c
new file mode 100644
index 0000000000..243f76f379
--- /dev/null
+++ b/libav/avio.c
@@ -0,0 +1,146 @@
+/*
+ * Unbuffered io for ffmpeg system
+ * Copyright (c) 2001 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 <errno.h>
+
+#include "avformat.h"
+
+URLProtocol *first_protocol = NULL;
+
+int register_protocol(URLProtocol *protocol)
+{
+    URLProtocol **p;
+    p = &first_protocol;
+    while (*p != NULL) p = &(*p)->next;
+    *p = protocol;
+    protocol->next = NULL;
+    return 0;
+}
+
+int url_open(URLContext **puc, const char *filename, int flags)
+{
+    URLContext *uc;
+    URLProtocol *up;
+    const char *p;
+    char proto_str[128], *q;
+    int err;
+
+    p = filename;
+    q = proto_str;
+    while (*p != '\0' && *p != ':') {
+        if ((q - proto_str) < sizeof(proto_str) - 1)
+            *q++ = *p;
+        p++;
+    }
+    if (*p == '\0') {
+        strcpy(proto_str, "file");
+    } else {
+        *q = '\0';
+    }
+    
+    up = first_protocol;
+    while (up != NULL) {
+        if (!strcmp(proto_str, up->name)) 
+            goto found;
+        up = up->next;
+    }
+    return -ENOENT;
+ found:
+    uc = malloc(sizeof(URLContext));
+    if (!uc)
+        return -ENOMEM;
+    uc->prot = up;
+    uc->flags = flags;
+    uc->is_streamed = 0; /* default = not streamed */
+    uc->packet_size = 1; /* default packet size */
+    err = up->url_open(uc, filename, flags);
+    if (err < 0) {
+        free(uc);
+        *puc = NULL;
+        return err;
+    }
+    *puc = uc;
+    return 0;
+}
+
+int url_read(URLContext *h, unsigned char *buf, int size)
+{
+    int ret;
+    if (h->flags & URL_WRONLY)
+        return -EIO;
+    ret = h->prot->url_read(h, buf, size);
+    return ret;
+}
+
+int url_write(URLContext *h, unsigned char *buf, int size)
+{
+    int ret;
+    if (!(h->flags & URL_WRONLY))
+        return -EIO;
+    ret = h->prot->url_write(h, buf, size);
+    return ret;
+}
+
+offset_t url_seek(URLContext *h, offset_t pos, int whence)
+{
+    offset_t ret;
+
+    if (!h->prot->url_seek)
+        return -EPIPE;
+    ret = h->prot->url_seek(h, pos, whence);
+    return ret;
+}
+
+int url_getformat(URLContext *h, URLFormat *f)
+{
+    memset(f, 0, sizeof(*f));
+    if (!h->prot->url_getformat)
+        return -ENODATA;
+    return h->prot->url_getformat(h, f);
+}
+
+int url_close(URLContext *h)
+{
+    int ret;
+
+    ret = h->prot->url_close(h);
+    free(h);
+    return ret;
+}
+
+int url_exist(const char *filename)
+{
+    URLContext *h;
+    if (url_open(&h, filename, URL_RDONLY) < 0)
+        return 0;
+    url_close(h);
+    return 1;
+}
+
+offset_t url_filesize(URLContext *h)
+{
+    offset_t pos, size;
+    
+    pos = url_seek(h, 0, SEEK_CUR);
+    size = url_seek(h, 0, SEEK_END);
+    url_seek(h, pos, SEEK_SET);
+    return size;
+}