decrease usb camera frame rate for improve performance, let audio run smooth

2 files changed, 11 insertions, 1 deletions

diff --git a/Android.mk b/Android.mk
index f109064..1bfbb3b 100755
--- a/Android.mk
+++ b/Android.mk
@@ -73,6 +73,10 @@ endif
 
 ifeq ($(BOARD_USE_USB_CAMERA),true)
     LOCAL_CFLAGS += -DAMLOGIC_USB_CAMERA_SUPPORT
+#descrease the number of camera captrue frames,and let skype run smoothly
+ifeq ($(BOARD_USB_CAMREA_DECREASE_FRAMES), true)
+	LOCAL_CFLAGS += -DAMLOGIC_USB_CAMERA_DECREASE_FRAMES
+endif
 else
     ifeq ($(BOARD_HAVE_MULTI_CAMERAS),true)
         LOCAL_CFLAGS += -DAMLOGIC_MULTI_CAMERA_SUPPORT
diff --git a/V4LCameraAdapter/V4LCameraAdapter.cpp b/V4LCameraAdapter/V4LCameraAdapter.cpp
index 1a34aef..c30c5e1 100755
--- a/V4LCameraAdapter/V4LCameraAdapter.cpp
+++ b/V4LCameraAdapter/V4LCameraAdapter.cpp
@@ -994,7 +994,13 @@ int V4LCameraAdapter::previewThread()
             usleep(delay);
             return BAD_VALUE;
         }
-        
+
+#ifdef AMLOGIC_USB_CAMERA_DECREASE_FRAMES
+		int previewFrameRate = mParams.getPreviewFrameRate();
+		int delay = (int)(1000000.0f / float(previewFrameRate)) >> 1;
+		usleep(delay*5);
+#endif
+		
         uint8_t* ptr = (uint8_t*) mPreviewBufs.keyAt(mPreviewIdxs.valueFor(index));
 
         if (!ptr)