memory: more fixes

Automatically make the memory of a buffer writable when the buffer is writable
and the memory is asked to mapped WRITE.
Add docs

1 files changed, 4 insertions, 4 deletions

diff --git a/tests/check/libs/adapter.c b/tests/check/libs/adapter.c
index f8310e33c..df1bc1cb6 100644
--- a/tests/check/libs/adapter.c
+++ b/tests/check/libs/adapter.c
@@ -280,16 +280,16 @@ create_and_fill_adapter (void)
 
   for (i = 0; i < 10000; i += 4) {
     GstBuffer *buf;
-    guint8 *data;
+    guint8 *data, *ptr;
 
     buf = gst_buffer_new_and_alloc (sizeof (guint32) * 4);
     fail_unless (buf != NULL);
 
-    data = gst_buffer_map (buf, NULL, NULL, GST_MAP_WRITE);
+    ptr = data = gst_buffer_map (buf, NULL, NULL, GST_MAP_WRITE);
 
     for (j = 0; j < 4; j++) {
-      GST_WRITE_UINT32_LE (data, i + j);
-      data += sizeof (guint32);
+      GST_WRITE_UINT32_LE (ptr, i + j);
+      ptr += sizeof (guint32);
     }
     gst_buffer_unmap (buf, data, sizeof (guint32) * 4);