Add unit test for stand-alone denoiser and fixed some bugs.

webrtc/modules/video_processing/test/denoiser_test.cc

+/*
+ *  Copyright (c) 2015 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.
+ */
+
+#include <string.h>
+
+#include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
+#include "webrtc/modules/video_processing/include/video_processing.h"
+#include "webrtc/modules/video_processing/test/video_processing_unittest.h"
+#include "webrtc/modules/video_processing/video_denoiser.h"
+
+namespace webrtc {
+
+TEST_F(VideoProcessingTest, CopyMem) {
+  rtc::scoped_ptr<DenoiserFilter> df_c(DenoiserFilter::Create(false));
+  rtc::scoped_ptr<DenoiserFilter> df_sse_neon(DenoiserFilter::Create(true));
+  uint8_t src[16 * 16], dst[16 * 16];
+  for (int i = 0; i < 16; ++i) {
+    for (int j = 0; j < 16; ++j) {
+      src[i * 16 + j] = i * 16 + j;
+    }
+  }
+
+  memset(dst, 0, 8 * 8);
+  df_c->CopyMem8x8(src, 8, dst, 8);
+  EXPECT_EQ(0, memcmp(src, dst, 8 * 8));
+
+  memset(dst, 0, 16 * 16);
+  df_c->CopyMem16x16(src, 16, dst, 16);
+  EXPECT_EQ(0, memcmp(src, dst, 16 * 16));
+
+  memset(dst, 0, 8 * 8);
+  df_sse_neon->CopyMem16x16(src, 8, dst, 8);
+  EXPECT_EQ(0, memcmp(src, dst, 8 * 8));
+
+  memset(dst, 0, 16 * 16);
+  df_sse_neon->CopyMem16x16(src, 16, dst, 16);
+  EXPECT_EQ(0, memcmp(src, dst, 16 * 16));
+}
+
+TEST_F(VideoProcessingTest, Variance) {
+  rtc::scoped_ptr<DenoiserFilter> df_c(DenoiserFilter::Create(false));
+  rtc::scoped_ptr<DenoiserFilter> df_sse_neon(DenoiserFilter::Create(true));
+  uint8_t src[16 * 16], dst[16 * 16];
+  uint32_t sum = 0, sse = 0, var;
+  for (int i = 0; i < 16; ++i) {
+    for (int j = 0; j < 16; ++j) {
+      src[i * 16 + j] = i * 16 + j;
+    }
+  }
+  // Compute the 16x8 variance of the 16x16 block.
+  for (int i = 0; i < 8; ++i) {
+    for (int j = 0; j < 16; ++j) {
+      sum += (i * 32 + j);
+      sse += (i * 32 + j) * (i * 32 + j);
+    }
+  }
+  var = sse - ((sum * sum) >> 7);
+  memset(dst, 0, 16 * 16);
+  EXPECT_EQ(var, df_c->Variance16x8(src, 16, dst, 16, &sse));
+  EXPECT_EQ(var, df_sse_neon->Variance16x8(src, 16, dst, 16, &sse));
+}
+
+TEST_F(VideoProcessingTest, MbDenoise) {
+  rtc::scoped_ptr<DenoiserFilter> df_c(DenoiserFilter::Create(false));
+  rtc::scoped_ptr<DenoiserFilter> df_sse_neon(DenoiserFilter::Create(true));
+  uint8_t running_src[16 * 16], src[16 * 16], dst[16 * 16], dst_ref[16 * 16];
+
+  // Test case: |diff| <= |3 + shift_inc1|
+  for (int i = 0; i < 16; ++i) {
+    for (int j = 0; j < 16; ++j) {
+      running_src[i * 16 + j] = i * 11 + j;
+      src[i * 16 + j] = i * 11 + j + 2;
+      dst_ref[i * 16 + j] = running_src[i * 16 + j];
+    }
+  }
+  memset(dst, 0, 16 * 16);
+  df_c->MbDenoise(running_src, 16, dst, 16, src, 16, 0, 1);
+  EXPECT_EQ(0, memcmp(dst, dst_ref, 16 * 16));
+
+  // Test case: |diff| >= |4 + shift_inc1|
+  for (int i = 0; i < 16; ++i) {
+    for (int j = 0; j < 16; ++j) {
+      running_src[i * 16 + j] = i * 11 + j;
+      src[i * 16 + j] = i * 11 + j + 5;
+      dst_ref[i * 16 + j] = src[i * 16 + j] - 2;
+    }
+  }
+  memset(dst, 0, 16 * 16);
+  df_c->MbDenoise(running_src, 16, dst, 16, src, 16, 0, 1);
+  EXPECT_EQ(0, memcmp(dst, dst_ref, 16 * 16));
+  memset(dst, 0, 16 * 16);
+  df_sse_neon->MbDenoise(running_src, 16, dst, 16, src, 16, 0, 1);
+  EXPECT_EQ(0, memcmp(dst, dst_ref, 16 * 16));
+
+  // Test case: |diff| >= 8
+  for (int i = 0; i < 16; ++i) {
+    for (int j = 0; j < 16; ++j) {
+      running_src[i * 16 + j] = i * 11 + j;
+      src[i * 16 + j] = i * 11 + j + 8;
+      dst_ref[i * 16 + j] = src[i * 16 + j] - 6;
+    }
+  }
+  memset(dst, 0, 16 * 16);
+  df_c->MbDenoise(running_src, 16, dst, 16, src, 16, 0, 1);
+  EXPECT_EQ(0, memcmp(dst, dst_ref, 16 * 16));
+  memset(dst, 0, 16 * 16);
+  df_sse_neon->MbDenoise(running_src, 16, dst, 16, src, 16, 0, 1);
+  EXPECT_EQ(0, memcmp(dst, dst_ref, 16 * 16));
+
+  // Test case: |diff| > 15
+  for (int i = 0; i < 16; ++i) {
+    for (int j = 0; j < 16; ++j) {
+      running_src[i * 16 + j] = i * 11 + j;
+      src[i * 16 + j] = i * 11 + j + 16;
+    }
+  }
+  memset(dst, 0, 16 * 16);
+  DenoiserDecision decision =
+      df_c->MbDenoise(running_src, 16, dst, 16, src, 16, 0, 1);
+  EXPECT_EQ(COPY_BLOCK, decision);
+  decision = df_sse_neon->MbDenoise(running_src, 16, dst, 16, src, 16, 0, 1);
+  EXPECT_EQ(COPY_BLOCK, decision);
+}
+
+TEST_F(VideoProcessingTest, Denoiser) {
+  // Create pure C denoiser.
+  VideoDenoiser denoiser_c(false);
+  // Create SSE or NEON denoiser.
+  VideoDenoiser denoiser_sse_neon(true);
+  VideoFrame denoised_frame_c;
+  VideoFrame denoised_frame_sse_neon;
+
+  rtc::scoped_ptr<uint8_t[]> video_buffer(new uint8_t[frame_length_]);
+  while (fread(video_buffer.get(), 1, frame_length_, source_file_) ==
+         frame_length_) {
+    // Using ConvertToI420 to add stride to the image.
+    EXPECT_EQ(0, ConvertToI420(kI420, video_buffer.get(), 0, 0, width_, height_,
+                               0, kVideoRotation_0, &video_frame_));
+
+    denoiser_c.DenoiseFrame(video_frame_, &denoised_frame_c);
+    denoiser_sse_neon.DenoiseFrame(video_frame_, &denoised_frame_sse_neon);
+
+    // Denoising results should be the same for C and SSE/NEON denoiser.
+    ASSERT_EQ(true, denoised_frame_c.EqualsFrame(denoised_frame_sse_neon));
+  }
+  ASSERT_NE(0, feof(source_file_)) << "Error reading source file";
+}
+
+}  // namespace webrtc