common_video/i420_video_frame_unittest.cc - src/webrtc - Git at Google

 /*
  *  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.
  */

 #include <math.h>
 #include <string.h>

 #include "webrtc/api/video/i420_buffer.h"
 #include "webrtc/api/video/video_frame.h"
 #include "webrtc/rtc_base/bind.h"
 #include "webrtc/rtc_base/timeutils.h"
 #include "webrtc/test/fake_texture_frame.h"
 #include "webrtc/test/frame_utils.h"
 #include "webrtc/test/gtest.h"

 namespace webrtc {

 namespace {

 rtc::scoped_refptr<I420Buffer> CreateGradient(int width, int height) {
   rtc::scoped_refptr<I420Buffer> buffer(
       I420Buffer::Create(width, height));
   // Initialize with gradient, Y = 128(x/w + y/h), U = 256 x/w, V = 256 y/h
   for (int x = 0; x < width; x++) {
     for (int y = 0; y < height; y++) {
       buffer->MutableDataY()[x + y * width] =
           128 * (x * height + y * width) / (width * height);
     }
   }
   int chroma_width = buffer->ChromaWidth();
   int chroma_height = buffer->ChromaHeight();
   for (int x = 0; x < chroma_width; x++) {
     for (int y = 0; y < chroma_height; y++) {
       buffer->MutableDataU()[x + y * chroma_width] =
           255 * x / (chroma_width - 1);
       buffer->MutableDataV()[x + y * chroma_width] =
           255 * y / (chroma_height - 1);
     }
   }
   return buffer;
 }

 // The offsets and sizes describe the rectangle extracted from the
 // original (gradient) frame, in relative coordinates where the
 // original frame correspond to the unit square, 0.0 <= x, y < 1.0.
 void CheckCrop(const webrtc::I420BufferInterface& frame,
                double offset_x,
                double offset_y,
                double rel_width,
                double rel_height) {
   int width = frame.width();
   int height = frame.height();
   // Check that pixel values in the corners match the gradient used
   // for initialization.
   for (int i = 0; i < 2; i++) {
     for (int j = 0; j < 2; j++) {
       // Pixel coordinates of the corner.
       int x = i * (width - 1);
       int y = j * (height - 1);
       // Relative coordinates, range 0.0 - 1.0 correspond to the
       // size of the uncropped input frame.
       double orig_x = offset_x + i * rel_width;
       double orig_y = offset_y + j * rel_height;

       EXPECT_NEAR(frame.DataY()[x + y * frame.StrideY()] / 256.0,
                   (orig_x + orig_y) / 2, 0.02);
       EXPECT_NEAR(frame.DataU()[x / 2 + (y / 2) * frame.StrideU()] / 256.0,
                   orig_x, 0.02);
       EXPECT_NEAR(frame.DataV()[x / 2 + (y / 2) * frame.StrideV()] / 256.0,
                   orig_y, 0.02);
     }
   }
 }

 void CheckRotate(int width,
                  int height,
                  webrtc::VideoRotation rotation,
                  const webrtc::I420BufferInterface& rotated) {
   int rotated_width = width;
   int rotated_height = height;

   if (rotation == kVideoRotation_90 || rotation == kVideoRotation_270) {
     std::swap(rotated_width, rotated_height);
   }
   EXPECT_EQ(rotated_width, rotated.width());
   EXPECT_EQ(rotated_height, rotated.height());

   // Clock-wise order (with 0,0 at top-left)
   const struct { int x; int y; } corners[] = {
     { 0, 0 }, { 1, 0 }, { 1, 1 }, { 0, 1 }
   };
   // Corresponding corner colors of the frame produced by CreateGradient.
   const struct { int y; int u; int v; } colors[] = {
     {0, 0, 0}, { 127, 255, 0}, { 255, 255, 255 }, {127, 0, 255}
   };
   int corner_offset = static_cast<int>(rotation) / 90;

   for (int i = 0; i < 4; i++) {
     int j = (i + corner_offset) % 4;
     int x = corners[j].x * (rotated_width - 1);
     int y = corners[j].y * (rotated_height - 1);
     EXPECT_EQ(colors[i].y, rotated.DataY()[x + y * rotated.StrideY()]);
     EXPECT_EQ(colors[i].u,
               rotated.DataU()[(x / 2) + (y / 2) * rotated.StrideU()]);
     EXPECT_EQ(colors[i].v,
               rotated.DataV()[(x / 2) + (y / 2) * rotated.StrideV()]);
   }
 }

 }  // namespace

 TEST(TestVideoFrame, WidthHeightValues) {
   VideoFrame frame(I420Buffer::Create(10, 10, 10, 14, 90),
                    webrtc::kVideoRotation_0,
                    789 * rtc::kNumMicrosecsPerMillisec);
   const int valid_value = 10;
   EXPECT_EQ(valid_value, frame.width());
   EXPECT_EQ(valid_value, frame.height());
   frame.set_timestamp(123u);
   EXPECT_EQ(123u, frame.timestamp());
   frame.set_ntp_time_ms(456);
   EXPECT_EQ(456, frame.ntp_time_ms());
   EXPECT_EQ(789, frame.render_time_ms());
 }

 TEST(TestVideoFrame, ShallowCopy) {
   uint32_t timestamp = 1;
   int64_t ntp_time_ms = 2;
   int64_t timestamp_us = 3;
   int stride_y = 15;
   int stride_u = 10;
   int stride_v = 10;
   int width = 15;
   int height = 15;

   const int kSizeY = 400;
   const int kSizeU = 100;
   const int kSizeV = 100;
   const VideoRotation kRotation = kVideoRotation_270;
   uint8_t buffer_y[kSizeY];
   uint8_t buffer_u[kSizeU];
   uint8_t buffer_v[kSizeV];
   memset(buffer_y, 16, kSizeY);
   memset(buffer_u, 8, kSizeU);
   memset(buffer_v, 4, kSizeV);

   VideoFrame frame1(
       I420Buffer::Copy(width, height,
                        buffer_y, stride_y,
                        buffer_u, stride_u,
                        buffer_v, stride_v),
       kRotation, 0);
   frame1.set_timestamp(timestamp);
   frame1.set_ntp_time_ms(ntp_time_ms);
   frame1.set_timestamp_us(timestamp_us);
   VideoFrame frame2(frame1);

   EXPECT_EQ(frame1.video_frame_buffer(), frame2.video_frame_buffer());
   rtc::scoped_refptr<I420BufferInterface> yuv1 =
       frame1.video_frame_buffer()->GetI420();
   rtc::scoped_refptr<I420BufferInterface> yuv2 =
       frame2.video_frame_buffer()->GetI420();
   EXPECT_EQ(yuv1->DataY(), yuv2->DataY());
   EXPECT_EQ(yuv1->DataU(), yuv2->DataU());
   EXPECT_EQ(yuv1->DataV(), yuv2->DataV());

   EXPECT_EQ(frame2.timestamp(), frame1.timestamp());
   EXPECT_EQ(frame2.ntp_time_ms(), frame1.ntp_time_ms());
   EXPECT_EQ(frame2.timestamp_us(), frame1.timestamp_us());
   EXPECT_EQ(frame2.rotation(), frame1.rotation());

   frame2.set_timestamp(timestamp + 1);
   frame2.set_ntp_time_ms(ntp_time_ms + 1);
   frame2.set_timestamp_us(timestamp_us + 1);
   frame2.set_rotation(kVideoRotation_90);

   EXPECT_NE(frame2.timestamp(), frame1.timestamp());
   EXPECT_NE(frame2.ntp_time_ms(), frame1.ntp_time_ms());
   EXPECT_NE(frame2.timestamp_us(), frame1.timestamp_us());
   EXPECT_NE(frame2.rotation(), frame1.rotation());
 }

 TEST(TestVideoFrame, TextureInitialValues) {
   VideoFrame frame = test::FakeNativeBuffer::CreateFrame(
       640, 480, 100, 10, webrtc::kVideoRotation_0);
   EXPECT_EQ(640, frame.width());
   EXPECT_EQ(480, frame.height());
   EXPECT_EQ(100u, frame.timestamp());
   EXPECT_EQ(10, frame.render_time_ms());
   ASSERT_TRUE(frame.video_frame_buffer() != nullptr);
   EXPECT_TRUE(frame.video_frame_buffer()->type() ==
               VideoFrameBuffer::Type::kNative);

   frame.set_timestamp(200);
   EXPECT_EQ(200u, frame.timestamp());
   frame.set_timestamp_us(20);
   EXPECT_EQ(20, frame.timestamp_us());
 }

 TEST(TestI420FrameBuffer, Copy) {
   rtc::scoped_refptr<I420Buffer> buf1(
       I420Buffer::Create(20, 10));
   memset(buf1->MutableDataY(), 1, 200);
   memset(buf1->MutableDataU(), 2, 50);
   memset(buf1->MutableDataV(), 3, 50);
   rtc::scoped_refptr<I420Buffer> buf2 = I420Buffer::Copy(*buf1);
   EXPECT_TRUE(test::FrameBufsEqual(buf1, buf2));
 }

 TEST(TestI420FrameBuffer, Scale) {
   rtc::scoped_refptr<I420Buffer> buf = CreateGradient(200, 100);

   // Pure scaling, no cropping.
   rtc::scoped_refptr<I420Buffer> scaled_buffer(
       I420Buffer::Create(150, 75));

   scaled_buffer->ScaleFrom(*buf);
   CheckCrop(*scaled_buffer, 0.0, 0.0, 1.0, 1.0);
 }

 TEST(TestI420FrameBuffer, CropXCenter) {
   rtc::scoped_refptr<I420Buffer> buf = CreateGradient(200, 100);

   // Pure center cropping, no scaling.
   rtc::scoped_refptr<I420Buffer> scaled_buffer(
       I420Buffer::Create(100, 100));

   scaled_buffer->CropAndScaleFrom(*buf, 50, 0, 100, 100);
   CheckCrop(*scaled_buffer, 0.25, 0.0, 0.5, 1.0);
 }

 TEST(TestI420FrameBuffer, CropXNotCenter) {
   rtc::scoped_refptr<I420Buffer> buf = CreateGradient(200, 100);

   // Non-center cropping, no scaling.
   rtc::scoped_refptr<I420Buffer> scaled_buffer(
       I420Buffer::Create(100, 100));

   scaled_buffer->CropAndScaleFrom(*buf, 25, 0, 100, 100);
   CheckCrop(*scaled_buffer, 0.125, 0.0, 0.5, 1.0);
 }

 TEST(TestI420FrameBuffer, CropYCenter) {
   rtc::scoped_refptr<I420Buffer> buf = CreateGradient(100, 200);

   // Pure center cropping, no scaling.
   rtc::scoped_refptr<I420Buffer> scaled_buffer(
       I420Buffer::Create(100, 100));

   scaled_buffer->CropAndScaleFrom(*buf, 0, 50, 100, 100);
   CheckCrop(*scaled_buffer, 0.0, 0.25, 1.0, 0.5);
 }

 TEST(TestI420FrameBuffer, CropYNotCenter) {
   rtc::scoped_refptr<I420Buffer> buf = CreateGradient(100, 200);

   // Non-center cropping, no scaling.
   rtc::scoped_refptr<I420Buffer> scaled_buffer(
       I420Buffer::Create(100, 100));

   scaled_buffer->CropAndScaleFrom(*buf, 0, 25, 100, 100);
   CheckCrop(*scaled_buffer, 0.0, 0.125, 1.0, 0.5);
 }

 TEST(TestI420FrameBuffer, CropAndScale16x9) {
   rtc::scoped_refptr<I420Buffer> buf = CreateGradient(640, 480);

   // Center crop to 640 x 360 (16/9 aspect), then scale down by 2.
   rtc::scoped_refptr<I420Buffer> scaled_buffer(
       I420Buffer::Create(320, 180));

   scaled_buffer->CropAndScaleFrom(*buf);
   CheckCrop(*scaled_buffer, 0.0, 0.125, 1.0, 0.75);
 }

 class TestI420BufferRotate
     : public ::testing::TestWithParam<webrtc::VideoRotation> {};

 TEST_P(TestI420BufferRotate, Rotates) {
   rtc::scoped_refptr<I420BufferInterface> buffer = CreateGradient(640, 480);
   rtc::scoped_refptr<I420BufferInterface> rotated_buffer =
       I420Buffer::Rotate(*buffer, GetParam());
   CheckRotate(640, 480, GetParam(), *rotated_buffer);
 }

 INSTANTIATE_TEST_CASE_P(Rotate, TestI420BufferRotate,
                         ::testing::Values(kVideoRotation_0,
                                           kVideoRotation_90,
                                           kVideoRotation_180,
                                           kVideoRotation_270));

 }  // namespace webrtc
	/*
	* 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.
	*/

	#include <math.h>
	#include <string.h>

	#include "webrtc/api/video/i420_buffer.h"
	#include "webrtc/api/video/video_frame.h"
	#include "webrtc/rtc_base/bind.h"
	#include "webrtc/rtc_base/timeutils.h"
	#include "webrtc/test/fake_texture_frame.h"
	#include "webrtc/test/frame_utils.h"
	#include "webrtc/test/gtest.h"

	namespace webrtc {

	namespace {

	rtc::scoped_refptr<I420Buffer> CreateGradient(int width, int height) {
	rtc::scoped_refptr<I420Buffer> buffer(
	I420Buffer::Create(width, height));
	// Initialize with gradient, Y = 128(x/w + y/h), U = 256 x/w, V = 256 y/h
	for (int x = 0; x < width; x++) {
	for (int y = 0; y < height; y++) {
	buffer->MutableDataY()[x + y * width] =
	128 * (x * height + y * width) / (width * height);
	}
	}
	int chroma_width = buffer->ChromaWidth();
	int chroma_height = buffer->ChromaHeight();
	for (int x = 0; x < chroma_width; x++) {
	for (int y = 0; y < chroma_height; y++) {
	buffer->MutableDataU()[x + y * chroma_width] =
	255 * x / (chroma_width - 1);
	buffer->MutableDataV()[x + y * chroma_width] =
	255 * y / (chroma_height - 1);
	}
	}
	return buffer;
	}

	// The offsets and sizes describe the rectangle extracted from the
	// original (gradient) frame, in relative coordinates where the
	// original frame correspond to the unit square, 0.0 <= x, y < 1.0.
	void CheckCrop(const webrtc::I420BufferInterface& frame,
	double offset_x,
	double offset_y,
	double rel_width,
	double rel_height) {
	int width = frame.width();
	int height = frame.height();
	// Check that pixel values in the corners match the gradient used
	// for initialization.
	for (int i = 0; i < 2; i++) {
	for (int j = 0; j < 2; j++) {
	// Pixel coordinates of the corner.
	int x = i * (width - 1);
	int y = j * (height - 1);
	// Relative coordinates, range 0.0 - 1.0 correspond to the
	// size of the uncropped input frame.
	double orig_x = offset_x + i * rel_width;
	double orig_y = offset_y + j * rel_height;

	EXPECT_NEAR(frame.DataY()[x + y * frame.StrideY()] / 256.0,
	(orig_x + orig_y) / 2, 0.02);
	EXPECT_NEAR(frame.DataU()[x / 2 + (y / 2) * frame.StrideU()] / 256.0,
	orig_x, 0.02);
	EXPECT_NEAR(frame.DataV()[x / 2 + (y / 2) * frame.StrideV()] / 256.0,
	orig_y, 0.02);
	}
	}
	}

	void CheckRotate(int width,
	int height,
	webrtc::VideoRotation rotation,
	const webrtc::I420BufferInterface& rotated) {
	int rotated_width = width;
	int rotated_height = height;

	if (rotation == kVideoRotation_90 \|\| rotation == kVideoRotation_270) {
	std::swap(rotated_width, rotated_height);
	}
	EXPECT_EQ(rotated_width, rotated.width());
	EXPECT_EQ(rotated_height, rotated.height());

	// Clock-wise order (with 0,0 at top-left)
	const struct { int x; int y; } corners[] = {
	{ 0, 0 }, { 1, 0 }, { 1, 1 }, { 0, 1 }
	};
	// Corresponding corner colors of the frame produced by CreateGradient.
	const struct { int y; int u; int v; } colors[] = {
	{0, 0, 0}, { 127, 255, 0}, { 255, 255, 255 }, {127, 0, 255}
	};
	int corner_offset = static_cast<int>(rotation) / 90;

	for (int i = 0; i < 4; i++) {
	int j = (i + corner_offset) % 4;
	int x = corners[j].x * (rotated_width - 1);
	int y = corners[j].y * (rotated_height - 1);
	EXPECT_EQ(colors[i].y, rotated.DataY()[x + y * rotated.StrideY()]);
	EXPECT_EQ(colors[i].u,
	rotated.DataU()[(x / 2) + (y / 2) * rotated.StrideU()]);
	EXPECT_EQ(colors[i].v,
	rotated.DataV()[(x / 2) + (y / 2) * rotated.StrideV()]);
	}
	}

	} // namespace

	TEST(TestVideoFrame, WidthHeightValues) {
	VideoFrame frame(I420Buffer::Create(10, 10, 10, 14, 90),
	webrtc::kVideoRotation_0,
	789 * rtc::kNumMicrosecsPerMillisec);
	const int valid_value = 10;
	EXPECT_EQ(valid_value, frame.width());
	EXPECT_EQ(valid_value, frame.height());
	frame.set_timestamp(123u);
	EXPECT_EQ(123u, frame.timestamp());
	frame.set_ntp_time_ms(456);
	EXPECT_EQ(456, frame.ntp_time_ms());
	EXPECT_EQ(789, frame.render_time_ms());
	}

	TEST(TestVideoFrame, ShallowCopy) {
	uint32_t timestamp = 1;
	int64_t ntp_time_ms = 2;
	int64_t timestamp_us = 3;
	int stride_y = 15;
	int stride_u = 10;
	int stride_v = 10;
	int width = 15;
	int height = 15;

	const int kSizeY = 400;
	const int kSizeU = 100;
	const int kSizeV = 100;
	const VideoRotation kRotation = kVideoRotation_270;
	uint8_t buffer_y[kSizeY];
	uint8_t buffer_u[kSizeU];
	uint8_t buffer_v[kSizeV];
	memset(buffer_y, 16, kSizeY);
	memset(buffer_u, 8, kSizeU);
	memset(buffer_v, 4, kSizeV);

	VideoFrame frame1(
	I420Buffer::Copy(width, height,
	buffer_y, stride_y,
	buffer_u, stride_u,
	buffer_v, stride_v),
	kRotation, 0);
	frame1.set_timestamp(timestamp);
	frame1.set_ntp_time_ms(ntp_time_ms);
	frame1.set_timestamp_us(timestamp_us);
	VideoFrame frame2(frame1);

	EXPECT_EQ(frame1.video_frame_buffer(), frame2.video_frame_buffer());
	rtc::scoped_refptr<I420BufferInterface> yuv1 =
	frame1.video_frame_buffer()->GetI420();
	rtc::scoped_refptr<I420BufferInterface> yuv2 =
	frame2.video_frame_buffer()->GetI420();
	EXPECT_EQ(yuv1->DataY(), yuv2->DataY());
	EXPECT_EQ(yuv1->DataU(), yuv2->DataU());
	EXPECT_EQ(yuv1->DataV(), yuv2->DataV());

	EXPECT_EQ(frame2.timestamp(), frame1.timestamp());
	EXPECT_EQ(frame2.ntp_time_ms(), frame1.ntp_time_ms());
	EXPECT_EQ(frame2.timestamp_us(), frame1.timestamp_us());
	EXPECT_EQ(frame2.rotation(), frame1.rotation());

	frame2.set_timestamp(timestamp + 1);
	frame2.set_ntp_time_ms(ntp_time_ms + 1);
	frame2.set_timestamp_us(timestamp_us + 1);
	frame2.set_rotation(kVideoRotation_90);

	EXPECT_NE(frame2.timestamp(), frame1.timestamp());
	EXPECT_NE(frame2.ntp_time_ms(), frame1.ntp_time_ms());
	EXPECT_NE(frame2.timestamp_us(), frame1.timestamp_us());
	EXPECT_NE(frame2.rotation(), frame1.rotation());
	}

	TEST(TestVideoFrame, TextureInitialValues) {
	VideoFrame frame = test::FakeNativeBuffer::CreateFrame(
	640, 480, 100, 10, webrtc::kVideoRotation_0);
	EXPECT_EQ(640, frame.width());
	EXPECT_EQ(480, frame.height());
	EXPECT_EQ(100u, frame.timestamp());
	EXPECT_EQ(10, frame.render_time_ms());
	ASSERT_TRUE(frame.video_frame_buffer() != nullptr);
	EXPECT_TRUE(frame.video_frame_buffer()->type() ==
	VideoFrameBuffer::Type::kNative);

	frame.set_timestamp(200);
	EXPECT_EQ(200u, frame.timestamp());
	frame.set_timestamp_us(20);
	EXPECT_EQ(20, frame.timestamp_us());
	}

	TEST(TestI420FrameBuffer, Copy) {
	rtc::scoped_refptr<I420Buffer> buf1(
	I420Buffer::Create(20, 10));
	memset(buf1->MutableDataY(), 1, 200);
	memset(buf1->MutableDataU(), 2, 50);
	memset(buf1->MutableDataV(), 3, 50);
	rtc::scoped_refptr<I420Buffer> buf2 = I420Buffer::Copy(*buf1);
	EXPECT_TRUE(test::FrameBufsEqual(buf1, buf2));
	}

	TEST(TestI420FrameBuffer, Scale) {
	rtc::scoped_refptr<I420Buffer> buf = CreateGradient(200, 100);

	// Pure scaling, no cropping.
	rtc::scoped_refptr<I420Buffer> scaled_buffer(
	I420Buffer::Create(150, 75));

	scaled_buffer->ScaleFrom(*buf);
	CheckCrop(*scaled_buffer, 0.0, 0.0, 1.0, 1.0);
	}

	TEST(TestI420FrameBuffer, CropXCenter) {
	rtc::scoped_refptr<I420Buffer> buf = CreateGradient(200, 100);

	// Pure center cropping, no scaling.
	rtc::scoped_refptr<I420Buffer> scaled_buffer(
	I420Buffer::Create(100, 100));

	scaled_buffer->CropAndScaleFrom(*buf, 50, 0, 100, 100);
	CheckCrop(*scaled_buffer, 0.25, 0.0, 0.5, 1.0);
	}

	TEST(TestI420FrameBuffer, CropXNotCenter) {
	rtc::scoped_refptr<I420Buffer> buf = CreateGradient(200, 100);

	// Non-center cropping, no scaling.
	rtc::scoped_refptr<I420Buffer> scaled_buffer(
	I420Buffer::Create(100, 100));

	scaled_buffer->CropAndScaleFrom(*buf, 25, 0, 100, 100);
	CheckCrop(*scaled_buffer, 0.125, 0.0, 0.5, 1.0);
	}

	TEST(TestI420FrameBuffer, CropYCenter) {
	rtc::scoped_refptr<I420Buffer> buf = CreateGradient(100, 200);

	// Pure center cropping, no scaling.
	rtc::scoped_refptr<I420Buffer> scaled_buffer(
	I420Buffer::Create(100, 100));

	scaled_buffer->CropAndScaleFrom(*buf, 0, 50, 100, 100);
	CheckCrop(*scaled_buffer, 0.0, 0.25, 1.0, 0.5);
	}

	TEST(TestI420FrameBuffer, CropYNotCenter) {
	rtc::scoped_refptr<I420Buffer> buf = CreateGradient(100, 200);

	// Non-center cropping, no scaling.
	rtc::scoped_refptr<I420Buffer> scaled_buffer(
	I420Buffer::Create(100, 100));

	scaled_buffer->CropAndScaleFrom(*buf, 0, 25, 100, 100);
	CheckCrop(*scaled_buffer, 0.0, 0.125, 1.0, 0.5);
	}

	TEST(TestI420FrameBuffer, CropAndScale16x9) {
	rtc::scoped_refptr<I420Buffer> buf = CreateGradient(640, 480);

	// Center crop to 640 x 360 (16/9 aspect), then scale down by 2.
	rtc::scoped_refptr<I420Buffer> scaled_buffer(
	I420Buffer::Create(320, 180));

	scaled_buffer->CropAndScaleFrom(*buf);
	CheckCrop(*scaled_buffer, 0.0, 0.125, 1.0, 0.75);
	}

	class TestI420BufferRotate
	: public ::testing::TestWithParam<webrtc::VideoRotation> {};

	TEST_P(TestI420BufferRotate, Rotates) {
	rtc::scoped_refptr<I420BufferInterface> buffer = CreateGradient(640, 480);
	rtc::scoped_refptr<I420BufferInterface> rotated_buffer =
	I420Buffer::Rotate(*buffer, GetParam());
	CheckRotate(640, 480, GetParam(), *rotated_buffer);
	}

	INSTANTIATE_TEST_CASE_P(Rotate, TestI420BufferRotate,
	::testing::Values(kVideoRotation_0,
	kVideoRotation_90,
	kVideoRotation_180,
	kVideoRotation_270));

	} // namespace webrtc