diff --git a/include/camera/CameraParameters.h b/include/camera/CameraParameters.h
index d521543..c6074fc 100644
--- a/include/camera/CameraParameters.h
+++ b/include/camera/CameraParameters.h
@@ -102,6 +102,12 @@
     void dump() const;
     status_t dump(int fd, const Vector<String16>& args) const;
 
+    /**
+     * Returns a Vector containing the supported preview formats
+     * as enums given in graphics.h.
+     */
+    void getSupportedPreviewFormats(Vector<int>& formats) const;
+
     // Parameter keys to communicate between camera application and driver.
     // The access (read/write, read only, or write only) is viewed from the
     // perspective of applications, not driver.
@@ -674,6 +680,13 @@
     // High-dynamic range mode
     static const char LIGHTFX_HDR[];
 
+    /**
+     * Returns the the supported preview formats as an enum given in graphics.h
+     * corrsponding to the format given in the input string or -1 if no such
+     * conversion exists.
+     */
+    static int previewFormatToEnum(const char* format);
+
 private:
     DefaultKeyedVector<String8,String8>    mMap;
 };
diff --git a/include/camera/camera2/ICameraDeviceUser.h b/include/camera/camera2/ICameraDeviceUser.h
index 913696f..35488bb 100644
--- a/include/camera/camera2/ICameraDeviceUser.h
+++ b/include/camera/camera2/ICameraDeviceUser.h
@@ -78,6 +78,27 @@
                                           /*out*/
                                           int64_t* lastFrameNumber = NULL) = 0;
 
+    /**
+     * Begin the device configuration.
+     *
+     * <p>
+     * beginConfigure must be called before any call to deleteStream, createStream,
+     * or endConfigure.  It is not valid to call this when the device is not idle.
+     * <p>
+     */
+    virtual status_t        beginConfigure() = 0;
+
+    /**
+     * End the device configuration.
+     *
+     * <p>
+     * endConfigure must be called after stream configuration is complete (i.e. after
+     * a call to beginConfigure and subsequent createStream/deleteStream calls).  This
+     * must be called before any requests can be submitted.
+     * <p>
+     */
+    virtual status_t        endConfigure() = 0;
+
     virtual status_t        deleteStream(int streamId) = 0;
     virtual status_t        createStream(
             int width, int height, int format,