diff --git a/media/libmediaplayer2/nuplayer2/Android.bp b/media/libmediaplayer2/nuplayer2/Android.bp
index 18e0380..9b3aad2 100644
--- a/media/libmediaplayer2/nuplayer2/Android.bp
+++ b/media/libmediaplayer2/nuplayer2/Android.bp
@@ -33,8 +33,6 @@
     cflags: [
         "-Werror",
         "-Wall",
-        // Allow implicit fallthroughs in NuPlayer2Driver.cpp until they are fixed.
-        "-Wno-error=implicit-fallthrough",
     ],
 
     product_variables: {
diff --git a/media/libstagefright/colorconversion/ColorConverter.cpp b/media/libstagefright/colorconversion/ColorConverter.cpp
index 947214b..70f52c3 100644
--- a/media/libstagefright/colorconversion/ColorConverter.cpp
+++ b/media/libstagefright/colorconversion/ColorConverter.cpp
@@ -25,8 +25,6 @@
 #include <media/stagefright/MediaErrors.h>
 
 #include "libyuv/convert_from.h"
-#include "libyuv/convert_argb.h"
-#include "libyuv/planar_functions.h"
 #include "libyuv/video_common.h"
 #include <functional>
 #include <sys/time.h>
@@ -73,17 +71,10 @@
 
         case OMX_COLOR_FormatCbYCrY:
         case OMX_QCOM_COLOR_FormatYVU420SemiPlanar:
+        case OMX_COLOR_FormatYUV420SemiPlanar:
         case OMX_TI_COLOR_FormatYUV420PackedSemiPlanar:
             return mDstFormat == OMX_COLOR_Format16bitRGB565;
 
-        case OMX_COLOR_FormatYUV420SemiPlanar:
-#ifdef USE_LIBYUV
-            return mDstFormat == OMX_COLOR_Format16bitRGB565
-                    || mDstFormat == OMX_COLOR_Format32BitRGBA8888;
-#else
-            return mDstFormat == OMX_COLOR_Format16bitRGB565;
-#endif
-
         default:
             return false;
     }
@@ -210,11 +201,7 @@
             break;
 
         case OMX_COLOR_FormatYUV420SemiPlanar:
-#ifdef USE_LIBYUV
-            err = convertYUV420SemiPlanarUseLibYUV(src, dst);
-#else
             err = convertYUV420SemiPlanar(src, dst);
-#endif
             break;
 
         case OMX_TI_COLOR_FormatYUV420PackedSemiPlanar:
@@ -327,36 +314,6 @@
     return OK;
 }
 
-status_t ColorConverter::convertYUV420SemiPlanarUseLibYUV(
-        const BitmapParams &src, const BitmapParams &dst) {
-    uint8_t *dst_ptr = (uint8_t *)dst.mBits
-        + dst.mCropTop * dst.mStride + dst.mCropLeft * dst.mBpp;
-
-    const uint8_t *src_y =
-        (const uint8_t *)src.mBits + src.mCropTop * src.mStride + src.mCropLeft;
-
-    const uint8_t *src_u =
-        (const uint8_t *)src.mBits + src.mStride * src.mHeight
-        + src.mCropTop * src.mStride + src.mCropLeft;
-
-    switch (mDstFormat) {
-    case OMX_COLOR_Format16bitRGB565:
-        libyuv::NV12ToRGB565(src_y, src.mStride, src_u, src.mStride, (uint8 *)dst_ptr,
-                dst.mStride, src.cropWidth(), src.cropHeight());
-        break;
-
-    case OMX_COLOR_Format32BitRGBA8888:
-        libyuv::NV12ToARGB(src_y, src.mStride, src_u, src.mStride, (uint8 *)dst_ptr,
-                dst.mStride, src.cropWidth(), src.cropHeight());
-        break;
-
-    default:
-        return ERROR_UNSUPPORTED;
-   }
-
-   return OK;
-}
-
 std::function<void (void *, void *, void *, size_t,
                     signed *, signed *, signed *, signed *)>
 getReadFromSrc(OMX_COLOR_FORMATTYPE srcFormat) {
diff --git a/media/libstagefright/include/media/stagefright/ColorConverter.h b/media/libstagefright/include/media/stagefright/ColorConverter.h
index 2d06111..5b3543d 100644
--- a/media/libstagefright/include/media/stagefright/ColorConverter.h
+++ b/media/libstagefright/include/media/stagefright/ColorConverter.h
@@ -78,9 +78,6 @@
     status_t convertYUV420PlanarUseLibYUV(
             const BitmapParams &src, const BitmapParams &dst);
 
-    status_t convertYUV420SemiPlanarUseLibYUV(
-            const BitmapParams &src, const BitmapParams &dst);
-
     status_t convertYUV420Planar16(
             const BitmapParams &src, const BitmapParams &dst);