API for deinterlacing YUV420 output on Android

source/row_common.cc

 /*
  *  Copyright 2011 The LibYuv 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.
  */
 
@@ skipping 970 matching lines @@
 #define UB -128 /* max(-128, round(-2.018 * 64)) */
 #define UG 25 /* round(0.391 * 64) */
 #define VG 52 /* round(0.813 * 64) */
 #define VR -102 /* round(-1.596 * 64) */
 
 // Bias values to subtract 16 from Y and 128 from U and V.
 #define BB (UB * 128            + YGB)
 #define BG (UG * 128 + VG * 128 + YGB)
 #define BR            (VR * 128 + YGB)
 
-#if defined(__aarch64__)
+#if defined(__aarch64__)  // 64 bit arm
 const YuvConstants SIMD_ALIGNED(kYuvI601Constants) = {
   { -UB, -VR, -UB, -VR, -UB, -VR, -UB, -VR },
   { -UB, -VR, -UB, -VR, -UB, -VR, -UB, -VR },
   { UG, VG, UG, VG, UG, VG, UG, VG },
   { UG, VG, UG, VG, UG, VG, UG, VG },
   { BB, BG, BR, 0, 0, 0, 0, 0 },
   { 0x0101 * YG, 0, 0, 0 }
 };
 const YuvConstants SIMD_ALIGNED(kYvuI601Constants) = {
   { -VR, -UB, -VR, -UB, -VR, -UB, -VR, -UB },
   { -VR, -UB, -VR, -UB, -VR, -UB, -VR, -UB },
   { VG, UG, VG, UG, VG, UG, VG, UG },
   { VG, UG, VG, UG, VG, UG, VG, UG },
   { BR, BG, BB, 0, 0, 0, 0, 0 },
   { 0x0101 * YG, 0, 0, 0 }
 };
-#elif defined(__arm__)
+#elif defined(__arm__)  // 32 bit arm
 const YuvConstants SIMD_ALIGNED(kYuvI601Constants) = {
   { -UB, -UB, -UB, -UB, -VR, -VR, -VR, -VR, 0, 0, 0, 0, 0, 0, 0, 0 },
   { UG, UG, UG, UG, VG, VG, VG, VG, 0, 0, 0, 0, 0, 0, 0, 0 },
   { BB, BG, BR, 0, 0, 0, 0, 0 },
   { 0x0101 * YG, 0, 0, 0 }
 };
 const YuvConstants SIMD_ALIGNED(kYvuI601Constants) = {
   { -VR, -VR, -VR, -VR, -UB, -UB, -UB, -UB, 0, 0, 0, 0, 0, 0, 0, 0 },
   { VG, VG, VG, VG, UG, UG, UG, UG, 0, 0, 0, 0, 0, 0, 0, 0 },
   { BR, BG, BB, 0, 0, 0, 0, 0 },
@@ skipping 1599 matching lines @@
     dst_rgb565 += twidth * 2;
     width -= twidth;
   }
 }
 #endif
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif