diff --git a/camera/CameraParameters.cpp b/camera/CameraParameters.cpp
index 45b1b9a..e9a5f8c 100644
--- a/camera/CameraParameters.cpp
+++ b/camera/CameraParameters.cpp
@@ -75,6 +75,7 @@
 const char CameraParameters::KEY_VIDEO_FRAME_FORMAT[] = "video-frame-format";
 const char CameraParameters::KEY_VIDEO_SIZE[] = "video-size";
 const char CameraParameters::KEY_SUPPORTED_VIDEO_SIZES[] = "video-size-values";
+const char CameraParameters::KEY_PREFERRED_PREVIEW_SIZE_FOR_VIDEO[] = "preferred-preview-size-for-video";
 
 const char CameraParameters::TRUE[] = "true";
 const char CameraParameters::FOCUS_DISTANCE_INFINITY[] = "Infinity";
@@ -333,6 +334,14 @@
     parse_pair(p, width, height, 'x');
 }
 
+void CameraParameters::getPreferredPreviewSizeForVideo(int *width, int *height) const
+{
+    *width = *height = -1;
+    const char *p = get(KEY_PREFERRED_PREVIEW_SIZE_FOR_VIDEO);
+    if (p == 0)  return;
+    parse_pair(p, width, height, 'x');
+}
+
 void CameraParameters::getSupportedPreviewSizes(Vector<Size> &sizes) const
 {
     const char *previewSizesStr = get(KEY_SUPPORTED_PREVIEW_SIZES);