libs/gst/bytestream/filepad.*: add 2 new functions

Original commit message from CVS:
* libs/gst/bytestream/filepad.c: (gst_file_pad_available),
(gst_file_pad_get_length):
* libs/gst/bytestream/filepad.h:
add 2 new functions

ChangeLog

@@ -1,3 +1,10 @@
+2004-06-24  Benjamin Otte  <in7y118@public.uni-hamburg.de>
+
+	* libs/gst/bytestream/filepad.c: (gst_file_pad_available),
+	(gst_file_pad_get_length):
+	* libs/gst/bytestream/filepad.h:
+	  add 2 new functions
+
 2004-06-22  Zaheer Abbas Merali  <zaheerabbas at merali.org>
 
 	* docs/gst/gstreamer-sections.txt:

libs/gst/bytestream/filepad.c

@@ -412,7 +412,7 @@ gst_file_pad_error (GstFilePad * pad)
 
 /**
  * gst_file_pad_eof:
- * @pad: ia #GstFilePad
+ * @pad: a #GstFilePad
  *
  * Checks if the EOS has been reached. This function is modeled after the 
  * function feof() from libc.
@@ -433,3 +433,50 @@ gst_file_pad_eof (GstFilePad * pad)
 
   return 1;
 }
+
+/**
+ * gst_file_pad_available:
+ * @pad: a #GstFilePad
+ *
+ * Use this function to figure out the maximum number of bytes that can be read
+ * via gst_file_pad_read() without that function returning -EAGAIN.
+ * 
+ * Returns: the number of bytes available in the file pad.
+ */
+guint
+gst_file_pad_available (GstFilePad * pad)
+{
+  g_return_val_if_fail (GST_IS_FILE_PAD (pad), 0);
+
+  return gst_adapter_available (pad->adapter);
+}
+
+/**
+ * gst_file_pad_get_length:
+ * @pad: a #GstFilePad
+ *
+ * Gets the length in bytes of the @pad.
+ *
+ * Returns: length in bytes or -1 if not available
+ */
+gint64
+gst_file_pad_get_length (GstFilePad * pad)
+{
+  GstFormat format = GST_FORMAT_BYTES;
+  gint64 length;
+  GstPad *peer;
+
+  g_return_val_if_fail (GST_IS_FILE_PAD (pad), -1);
+
+  /* we query the length every time to avoid issues with changing lengths */
+  peer = GST_PAD_PEER (pad);
+  if (!peer)
+    return -1;
+  if (gst_pad_query (peer, GST_QUERY_TOTAL, &format, &length))
+    return length;
+  format = GST_FORMAT_DEFAULT;
+  if (gst_pad_query (peer, GST_QUERY_TOTAL, &format, &length))
+    return length;
+
+  return -1;
+}

libs/gst/bytestream/filepad.h

@@ -74,6 +74,8 @@ void			gst_file_pad_set_event_function	(GstFilePad *file_pad,
 void			gst_file_pad_set_iterate_function (GstFilePad *file_pad,
 							 GstFilePadIterateFunction iterate);
 
+guint			gst_file_pad_available		(GstFilePad *pad);
+gint64			gst_file_pad_get_length		(GstFilePad *pad);
 /* this is a file like interface */
 /* FIXME: is gint64 the correct type? (it must be signed to get error return vals */
 gint64			gst_file_pad_read		(GstFilePad *pad,