Reland of Optimize Android NV12 capture

webrtc/common_video/libyuv/include/webrtc_libyuv.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 /*
  * WebRTC's wrapper to libyuv.
  */
 
 #ifndef WEBRTC_COMMON_VIDEO_LIBYUV_INCLUDE_WEBRTC_LIBYUV_H_
 #define WEBRTC_COMMON_VIDEO_LIBYUV_INCLUDE_WEBRTC_LIBYUV_H_
 
 #include <stdio.h>
+#include <vector>
 
 #include "webrtc/common_types.h"  // RawVideoTypes.
 #include "webrtc/common_video/rotation.h"
 #include "webrtc/typedefs.h"
 #include "webrtc/video_frame.h"
 
 namespace webrtc {
 
 // Supported video types.
 enum VideoType {
@@ skipping 87 matching lines @@
                     VideoType dst_video_type,
                     int dst_sample_size,
                     uint8_t* dst_frame);
 
 // Compute PSNR for an I420 frame (all planes).
 // Returns the PSNR in decibel, to a maximum of kInfinitePSNR.
 double I420PSNR(const VideoFrame* ref_frame, const VideoFrame* test_frame);
 // Compute SSIM for an I420 frame (all planes).
 double I420SSIM(const VideoFrame* ref_frame, const VideoFrame* test_frame);
 
+// Helper class for directly converting and scaling NV12 to I420. The Y-plane
+// will be scaled directly to the I420 destination, which makes this faster
+// than separate NV12->I420 + I420->I420 scaling.
+class NV12ToI420Scaler {
+ public:
+  void NV12ToI420Scale(const uint8_t* src_y, int src_stride_y,
+                       const uint8_t* src_uv, int src_stride_uv,
+                       int src_width, int src_height,
+                       uint8_t* dst_y, int dst_stride_y,
+                       uint8_t* dst_u, int dst_stride_u,
+                       uint8_t* dst_v, int dst_stride_v,
+                       int dst_width, int dst_height);
+ private:
+  std::vector<uint8_t> tmp_uv_planes_;
+};
+
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_VIDEO_LIBYUV_INCLUDE_WEBRTC_LIBYUV_H_