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"
+#include "webrtc/test/testsupport/gtest_disable.h"
+
+namespace webrtc {
+
+static int CompareImage(const VideoFrame *const img1,

[stefan-webrtc, 2015/12/10 08:53:25]

bool

Or maybe we can break out EqualFrames() in i420_video_frame_unittest.cc into a
new file in webrtc/test/ and use that function here too?

[jackychen, 2015/12/11 19:57:56]

I broke out EqualFrames() and put it in video_frame.cc, in modules.gyp added
dependency to common_video. Then I found one ugly issue, that in
video_capture_input_unittest.cc there is another function have the same name, I
don't want to touch that file, so I have to rename it to EqualFrame().
How about that?

[stefan-webrtc, 2015/12/15 21:00:30]

Maybe you could make it a method of the VideoFrame class instead?

[jackychen, 2015/12/16 22:41:56]

Done.

+                        const VideoFrame *const img2) {
+  int match = 1;

[stefan-webrtc, 2015/12/10 08:53:25]

bool

[jackychen, 2015/12/11 19:57:56]

Done.

+  match &= (img1->width() == img2->width());
+  match &= (img1->height() == img2->height());
+  // Y plane should match.
+  for (int i = 0; i < img1->height(); ++i)
+    match &= (memcmp(img1->buffer(kYPlane) + i * img1->stride(kYPlane),
+                     img2->buffer(kYPlane) + i * img2->stride(kYPlane),
+                     img1->width()) == 0);
+  // U plane should match.
+  for (int i = 0; i < img1->height() >> 1; ++i)
+    match &= (memcmp(img1->buffer(kUPlane) + i * img1->stride(kUPlane),
+                     img2->buffer(kUPlane) + i * img2->stride(kUPlane),
+                     img1->width() >> 1) == 0);
+  // V plane should match.
+  for (int i = 0; i < img1->height() >> 1; ++i)
+    match &= (memcmp(img1->buffer(kVPlane) + i * img1->stride(kVPlane),
+                     img2->buffer(kVPlane) + i * img2->stride(kVPlane),
+                     img1->width() >> 1) == 0);
+  return match;
+}
+
+TEST_F(VideoProcessingModuleTest, DISABLED_ON_IOS(Denoiser)) {

[stefan-webrtc, 2015/12/10 08:53:25]

Comment on why we disable on iOS

[jackychen, 2015/12/11 19:57:56]

I don't know why, but in modules.gyp line 107, I saw
['OS!="ios" or target_arch=="arm" or target_arch=="arm64"',
And I found all other tests in the same folder with mine apply this.

[stefan-webrtc, 2015/12/15 21:00:30]

Hm, ok. Could you try to do a tryjob without it? If it works it would be good to
also run on iOS, I think.

[jackychen, 2015/12/16 22:41:56]

Seems OK to run on iOS. Done.

+  rtc::scoped_ptr<VideoDenoiser> denoiser_c;
+  rtc::scoped_ptr<VideoDenoiser> denoiser_sse_neon;
+  VideoFrame denoised_frame_c;
+  VideoFrame denoised_frame_sse_neon;
+
+  // Create pure C denoiser.
+  denoiser_c.reset(new VideoDenoiser(false));

[stefan-webrtc, 2015/12/10 08:53:25]

You may be able to just create these denoisers on the stack, or?
VideoDenoiser denoiser_c(false);

[jackychen, 2015/12/11 19:57:56]

Done.

+  // Create SSE or NEON denoiser.
+  denoiser_sse_neon.reset(new VideoDenoiser(true));
+
+  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(1, CompareImage(&denoised_frame_c, &denoised_frame_sse_neon));
+  }
+  ASSERT_NE(0, feof(source_file_)) << "Error reading source file";
+}
+
+}  // namespace webrtc