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/*
* Copyright 2018 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.
*/
package org.webrtc;
import static org.hamcrest.Matchers.greaterThanOrEqualTo;
import static org.hamcrest.Matchers.lessThanOrEqualTo;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import android.graphics.Matrix;
import android.graphics.SurfaceTexture;
import android.opengl.GLES20;
import android.os.Handler;
import android.os.HandlerThread;
import android.support.test.InstrumentationRegistry;
import android.support.test.filters.SmallTest;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.chromium.base.test.params.BaseJUnit4RunnerDelegate;
import org.chromium.base.test.params.ParameterAnnotations.ClassParameter;
import org.chromium.base.test.params.ParameterAnnotations.UseRunnerDelegate;
import org.chromium.base.test.params.ParameterSet;
import org.chromium.base.test.params.ParameterizedRunner;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
/**
* Test VideoFrame buffers of different kind of formats: I420, RGB, OES, NV12, NV21, and verify
* toI420() and cropAndScale() behavior. Creating RGB/OES textures involves VideoFrameDrawer and
* GlRectDrawer and we are testing the full chain I420 -> OES/RGB texture -> I420, with and without
* cropping in the middle. Reading textures back to I420 also exercises the YuvConverter code.
*/
@RunWith(ParameterizedRunner.class)
@UseRunnerDelegate(BaseJUnit4RunnerDelegate.class)
public class VideoFrameBufferTest {
/**
* These tests are parameterized on this enum which represents the different VideoFrame.Buffers.
*/
private static enum BufferType { I420, RGB_TEXTURE, OES_TEXTURE, NV21, NV12 }
@ClassParameter private static List<ParameterSet> CLASS_PARAMS = new ArrayList<>();
static {
for (BufferType bufferType : BufferType.values()) {
// The parameterization framework can not send Enums, so we pass it as a string instead.
CLASS_PARAMS.add(new ParameterSet().value(bufferType.name()).name(bufferType.name()));
}
}
@BeforeClass
public static void setUp() {
// Needed for JniCommon.nativeAllocateByteBuffer() to work, which is used from JavaI420Buffer.
System.loadLibrary(TestConstants.NATIVE_LIBRARY);
}
private final BufferType bufferType;
public VideoFrameBufferTest(String bufferTypeName) {
// Parse the string back to an enum.
bufferType = BufferType.valueOf(bufferTypeName);
}
/**
* Create a VideoFrame.Buffer of the given type with the same pixel content as the given I420
* buffer.
*/
private static VideoFrame.Buffer createBufferWithType(
BufferType bufferType, VideoFrame.I420Buffer i420Buffer) {
switch (bufferType) {
case I420:
return i420Buffer.toI420();
case RGB_TEXTURE:
return createRgbTextureBuffer(/* eglContext= */ null, i420Buffer);
case OES_TEXTURE:
return createOesTextureBuffer(/* eglContext= */ null, i420Buffer);
case NV21:
return createNV21Buffer(i420Buffer);
case NV12:
return createNV12Buffer(i420Buffer);
default:
throw new IllegalArgumentException("Unknown buffer type: " + bufferType);
}
}
private VideoFrame.Buffer createBufferToTest(VideoFrame.I420Buffer i420Buffer) {
return createBufferWithType(this.bufferType, i420Buffer);
}
/**
* Creates a 16x16 I420 buffer that varies smoothly and spans all RGB values.
*/
public static VideoFrame.I420Buffer createTestI420Buffer() {
final int width = 16;
final int height = 16;
final int[] yData = new int[] {156, 162, 167, 172, 177, 182, 187, 193, 199, 203, 209, 214, 219,
224, 229, 235, 147, 152, 157, 162, 168, 173, 178, 183, 188, 193, 199, 205, 210, 215, 220,
225, 138, 143, 148, 153, 158, 163, 168, 174, 180, 184, 190, 195, 200, 205, 211, 216, 128,
133, 138, 144, 149, 154, 159, 165, 170, 175, 181, 186, 191, 196, 201, 206, 119, 124, 129,
134, 140, 145, 150, 156, 161, 166, 171, 176, 181, 187, 192, 197, 109, 114, 119, 126, 130,
136, 141, 146, 151, 156, 162, 167, 172, 177, 182, 187, 101, 105, 111, 116, 121, 126, 132,
137, 142, 147, 152, 157, 162, 168, 173, 178, 90, 96, 101, 107, 112, 117, 122, 127, 132, 138,
143, 148, 153, 158, 163, 168, 82, 87, 92, 97, 102, 107, 113, 118, 123, 128, 133, 138, 144,
149, 154, 159, 72, 77, 83, 88, 93, 98, 103, 108, 113, 119, 124, 129, 134, 139, 144, 150, 63,
68, 73, 78, 83, 89, 94, 99, 104, 109, 114, 119, 125, 130, 135, 140, 53, 58, 64, 69, 74, 79,
84, 89, 95, 100, 105, 110, 115, 120, 126, 131, 44, 49, 54, 59, 64, 70, 75, 80, 85, 90, 95,
101, 106, 111, 116, 121, 34, 40, 45, 50, 55, 60, 65, 71, 76, 81, 86, 91, 96, 101, 107, 113,
25, 30, 35, 40, 46, 51, 56, 61, 66, 71, 77, 82, 87, 92, 98, 103, 16, 21, 26, 31, 36, 41, 46,
52, 57, 62, 67, 72, 77, 83, 89, 94};
final int[] uData = new int[] {110, 113, 116, 118, 120, 123, 125, 128, 113, 116, 118, 120, 123,
125, 128, 130, 116, 118, 120, 123, 125, 128, 130, 132, 118, 120, 123, 125, 128, 130, 132,
135, 120, 123, 125, 128, 130, 132, 135, 138, 123, 125, 128, 130, 132, 135, 138, 139, 125,
128, 130, 132, 135, 138, 139, 142, 128, 130, 132, 135, 138, 139, 142, 145};
final int[] vData = new int[] {31, 45, 59, 73, 87, 100, 114, 127, 45, 59, 73, 87, 100, 114, 128,
141, 59, 73, 87, 100, 114, 127, 141, 155, 73, 87, 100, 114, 127, 141, 155, 168, 87, 100,
114, 128, 141, 155, 168, 182, 100, 114, 128, 141, 155, 168, 182, 197, 114, 127, 141, 155,
168, 182, 196, 210, 127, 141, 155, 168, 182, 196, 210, 224};
return JavaI420Buffer.wrap(width, height, toByteBuffer(yData),
/* strideY= */ width, toByteBuffer(uData), /* strideU= */ width / 2, toByteBuffer(vData),
/* strideV= */ width / 2,
/* releaseCallback= */ null);
}
/**
* Create an RGB texture buffer available in |eglContext| with the same pixel content as the given
* I420 buffer.
*/
public static VideoFrame.TextureBuffer createRgbTextureBuffer(
EglBase.Context eglContext, VideoFrame.I420Buffer i420Buffer) {
final int width = i420Buffer.getWidth();
final int height = i420Buffer.getHeight();
final HandlerThread renderThread = new HandlerThread("RGB texture thread");
renderThread.start();
final Handler renderThreadHandler = new Handler(renderThread.getLooper());
return ThreadUtils.invokeAtFrontUninterruptibly(renderThreadHandler, () -> {
// Create EGL base with a pixel buffer as display output.
final EglBase eglBase = EglBase.create(eglContext, EglBase.CONFIG_PIXEL_BUFFER);
eglBase.createDummyPbufferSurface();
eglBase.makeCurrent();
final GlTextureFrameBuffer textureFrameBuffer = new GlTextureFrameBuffer(GLES20.GL_RGBA);
textureFrameBuffer.setSize(width, height);
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, textureFrameBuffer.getFrameBufferId());
drawI420Buffer(i420Buffer);
GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
final YuvConverter yuvConverter = new YuvConverter();
return new TextureBufferImpl(width, height, VideoFrame.TextureBuffer.Type.RGB,
textureFrameBuffer.getTextureId(),
/* transformMatrix= */ new Matrix(), renderThreadHandler, yuvConverter,
/* releaseCallback= */ () -> renderThreadHandler.post(() -> {
textureFrameBuffer.release();
yuvConverter.release();
eglBase.release();
renderThread.quit();
}));
});
}
/**
* Create an OES texture buffer available in |eglContext| with the same pixel content as the given
* I420 buffer.
*/
public static VideoFrame.TextureBuffer createOesTextureBuffer(
EglBase.Context eglContext, VideoFrame.I420Buffer i420Buffer) {
final int width = i420Buffer.getWidth();
final int height = i420Buffer.getHeight();
// Create resources for generating OES textures.
final SurfaceTextureHelper surfaceTextureHelper =
SurfaceTextureHelper.create("SurfaceTextureHelper test", eglContext);
surfaceTextureHelper.setTextureSize(width, height);
final HandlerThread renderThread = new HandlerThread("OES texture thread");
renderThread.start();
final Handler renderThreadHandler = new Handler(renderThread.getLooper());
final VideoFrame.TextureBuffer oesBuffer =
ThreadUtils.invokeAtFrontUninterruptibly(renderThreadHandler, () -> {
// Create EGL base with the SurfaceTexture as display output.
final EglBase eglBase = EglBase.create(eglContext, EglBase.CONFIG_PLAIN);
eglBase.createSurface(surfaceTextureHelper.getSurfaceTexture());
eglBase.makeCurrent();
assertEquals(width, eglBase.surfaceWidth());
assertEquals(height, eglBase.surfaceHeight());
final SurfaceTextureHelperTest.MockTextureListener listener =
new SurfaceTextureHelperTest.MockTextureListener();
surfaceTextureHelper.startListening(listener);
// Draw the frame and block until an OES texture is delivered.
drawI420Buffer(i420Buffer);
eglBase.swapBuffers();
final VideoFrame.TextureBuffer textureBuffer = listener.waitForTextureBuffer();
surfaceTextureHelper.stopListening();
surfaceTextureHelper.dispose();
return textureBuffer;
});
renderThread.quit();
return oesBuffer;
}
/** Create an NV21Buffer with the same pixel content as the given I420 buffer. */
public static NV21Buffer createNV21Buffer(VideoFrame.I420Buffer i420Buffer) {
final int width = i420Buffer.getWidth();
final int height = i420Buffer.getHeight();
final int chromaStride = width;
final int chromaWidth = (width + 1) / 2;
final int chromaHeight = (height + 1) / 2;
final int ySize = width * height;
final ByteBuffer nv21Buffer = ByteBuffer.allocateDirect(ySize + chromaStride * chromaHeight);
// We don't care what the array offset is since we only want an array that is direct.
@SuppressWarnings("ByteBufferBackingArray") final byte[] nv21Data = nv21Buffer.array();
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
final byte yValue = i420Buffer.getDataY().get(y * i420Buffer.getStrideY() + x);
nv21Data[y * width + x] = yValue;
}
}
for (int y = 0; y < chromaHeight; ++y) {
for (int x = 0; x < chromaWidth; ++x) {
final byte uValue = i420Buffer.getDataU().get(y * i420Buffer.getStrideU() + x);
final byte vValue = i420Buffer.getDataV().get(y * i420Buffer.getStrideV() + x);
nv21Data[ySize + y * chromaStride + 2 * x + 0] = vValue;
nv21Data[ySize + y * chromaStride + 2 * x + 1] = uValue;
}
}
return new NV21Buffer(nv21Data, width, height, /* releaseCallback= */ null);
}
/** Create an NV12Buffer with the same pixel content as the given I420 buffer. */
public static NV12Buffer createNV12Buffer(VideoFrame.I420Buffer i420Buffer) {
final int width = i420Buffer.getWidth();
final int height = i420Buffer.getHeight();
final int chromaStride = width;
final int chromaWidth = (width + 1) / 2;
final int chromaHeight = (height + 1) / 2;
final int ySize = width * height;
final ByteBuffer nv12Buffer = ByteBuffer.allocateDirect(ySize + chromaStride * chromaHeight);
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
final byte yValue = i420Buffer.getDataY().get(y * i420Buffer.getStrideY() + x);
nv12Buffer.put(y * width + x, yValue);
}
}
for (int y = 0; y < chromaHeight; ++y) {
for (int x = 0; x < chromaWidth; ++x) {
final byte uValue = i420Buffer.getDataU().get(y * i420Buffer.getStrideU() + x);
final byte vValue = i420Buffer.getDataV().get(y * i420Buffer.getStrideV() + x);
nv12Buffer.put(ySize + y * chromaStride + 2 * x + 0, uValue);
nv12Buffer.put(ySize + y * chromaStride + 2 * x + 1, vValue);
}
}
return new NV12Buffer(width, height, /* stride= */ width, /* sliceHeight= */ height, nv12Buffer,
/* releaseCallback */ null);
}
/** Print the ByteBuffer plane to the StringBuilder. */
private static void printPlane(
StringBuilder stringBuilder, int width, int height, ByteBuffer plane, int stride) {
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
final int value = plane.get(y * stride + x) & 0xFF;
if (x != 0) {
stringBuilder.append(", ");
}
stringBuilder.append(value);
}
stringBuilder.append("\n");
}
}
/** Convert the pixel content of an I420 buffer to a string representation. */
private static String i420BufferToString(VideoFrame.I420Buffer buffer) {
final StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append(
"I420 buffer with size: " + buffer.getWidth() + "x" + buffer.getHeight() + ".\n");
stringBuilder.append("Y-plane:\n");
printPlane(stringBuilder, buffer.getWidth(), buffer.getHeight(), buffer.getDataY(),
buffer.getStrideY());
final int chromaWidth = (buffer.getWidth() + 1) / 2;
final int chromaHeight = (buffer.getHeight() + 1) / 2;
stringBuilder.append("U-plane:\n");
printPlane(stringBuilder, chromaWidth, chromaHeight, buffer.getDataU(), buffer.getStrideU());
stringBuilder.append("V-plane:\n");
printPlane(stringBuilder, chromaWidth, chromaHeight, buffer.getDataV(), buffer.getStrideV());
return stringBuilder.toString();
}
/**
* Assert that the given I420 buffers are almost identical, allowing for some difference due to
* numerical errors. It has limits for both overall PSNR and maximum individual pixel difference.
*/
public static void assertAlmostEqualI420Buffers(
VideoFrame.I420Buffer bufferA, VideoFrame.I420Buffer bufferB) {
final int diff = maxDiff(bufferA, bufferB);
assertThat("Pixel difference too high: " + diff + "."
+ "\nBuffer A: " + i420BufferToString(bufferA)
+ "Buffer B: " + i420BufferToString(bufferB),
diff, lessThanOrEqualTo(4));
final double psnr = calculatePsnr(bufferA, bufferB);
assertThat("PSNR too low: " + psnr + "."
+ "\nBuffer A: " + i420BufferToString(bufferA)
+ "Buffer B: " + i420BufferToString(bufferB),
psnr, greaterThanOrEqualTo(50.0));
}
/** Returns a flattened list of pixel differences for two ByteBuffer planes. */
private static List<Integer> getPixelDiffs(
int width, int height, ByteBuffer planeA, int strideA, ByteBuffer planeB, int strideB) {
List<Integer> res = new ArrayList<>();
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
final int valueA = planeA.get(y * strideA + x) & 0xFF;
final int valueB = planeB.get(y * strideB + x) & 0xFF;
res.add(Math.abs(valueA - valueB));
}
}
return res;
}
/** Returns a flattened list of pixel differences for two I420 buffers. */
private static List<Integer> getPixelDiffs(
VideoFrame.I420Buffer bufferA, VideoFrame.I420Buffer bufferB) {
assertEquals(bufferA.getWidth(), bufferB.getWidth());
assertEquals(bufferA.getHeight(), bufferB.getHeight());
final int width = bufferA.getWidth();
final int height = bufferA.getHeight();
final int chromaWidth = (width + 1) / 2;
final int chromaHeight = (height + 1) / 2;
final List<Integer> diffs = getPixelDiffs(width, height, bufferA.getDataY(),
bufferA.getStrideY(), bufferB.getDataY(), bufferB.getStrideY());
diffs.addAll(getPixelDiffs(chromaWidth, chromaHeight, bufferA.getDataU(), bufferA.getStrideU(),
bufferB.getDataU(), bufferB.getStrideU()));
diffs.addAll(getPixelDiffs(chromaWidth, chromaHeight, bufferA.getDataV(), bufferA.getStrideV(),
bufferB.getDataV(), bufferB.getStrideV()));
return diffs;
}
/** Returns the maximum pixel difference from any of the Y/U/V planes in the given buffers. */
private static int maxDiff(VideoFrame.I420Buffer bufferA, VideoFrame.I420Buffer bufferB) {
return Collections.max(getPixelDiffs(bufferA, bufferB));
}
/**
* Returns the PSNR given a sum of squared error and the number of measurements that were added.
*/
private static double sseToPsnr(long sse, int count) {
if (sse == 0) {
return Double.POSITIVE_INFINITY;
}
final double meanSquaredError = (double) sse / (double) count;
final double maxPixelValue = 255.0;
return 10.0 * Math.log10(maxPixelValue * maxPixelValue / meanSquaredError);
}
/** Returns the PSNR of the given I420 buffers. */
private static double calculatePsnr(
VideoFrame.I420Buffer bufferA, VideoFrame.I420Buffer bufferB) {
final List<Integer> pixelDiffs = getPixelDiffs(bufferA, bufferB);
long sse = 0;
for (int pixelDiff : pixelDiffs) {
sse += pixelDiff * pixelDiff;
}
return sseToPsnr(sse, pixelDiffs.size());
}
/**
* Convert an int array to a byte array and make sure the values are within the range [0, 255].
*/
private static byte[] toByteArray(int[] array) {
final byte[] res = new byte[array.length];
for (int i = 0; i < array.length; ++i) {
final int value = array[i];
assertThat(value, greaterThanOrEqualTo(0));
assertThat(value, lessThanOrEqualTo(255));
res[i] = (byte) value;
}
return res;
}
/** Convert a byte array to a direct ByteBuffer. */
private static ByteBuffer toByteBuffer(int[] array) {
final ByteBuffer buffer = ByteBuffer.allocateDirect(array.length);
buffer.put(toByteArray(array));
buffer.rewind();
return buffer;
}
/**
* Draw an I420 buffer on the currently bound frame buffer, allocating and releasing any
* resources necessary.
*/
private static void drawI420Buffer(VideoFrame.I420Buffer i420Buffer) {
final GlRectDrawer drawer = new GlRectDrawer();
final VideoFrameDrawer videoFrameDrawer = new VideoFrameDrawer();
videoFrameDrawer.drawFrame(
new VideoFrame(i420Buffer, /* rotation= */ 0, /* timestampNs= */ 0), drawer);
videoFrameDrawer.release();
drawer.release();
}
/**
* Helper function that tests cropAndScale() with the given cropping and scaling parameters, and
* compares the pixel content against a reference I420 buffer.
*/
private void testCropAndScale(
int cropX, int cropY, int cropWidth, int cropHeight, int scaleWidth, int scaleHeight) {
final VideoFrame.I420Buffer referenceI420Buffer = createTestI420Buffer();
final VideoFrame.Buffer bufferToTest = createBufferToTest(referenceI420Buffer);
final VideoFrame.Buffer croppedReferenceBuffer = referenceI420Buffer.cropAndScale(
cropX, cropY, cropWidth, cropHeight, scaleWidth, scaleHeight);
referenceI420Buffer.release();
final VideoFrame.I420Buffer croppedReferenceI420Buffer = croppedReferenceBuffer.toI420();
croppedReferenceBuffer.release();
final VideoFrame.Buffer croppedBufferToTest =
bufferToTest.cropAndScale(cropX, cropY, cropWidth, cropHeight, scaleWidth, scaleHeight);
bufferToTest.release();
final VideoFrame.I420Buffer croppedOutputI420Buffer = croppedBufferToTest.toI420();
croppedBufferToTest.release();
assertAlmostEqualI420Buffers(croppedReferenceI420Buffer, croppedOutputI420Buffer);
croppedReferenceI420Buffer.release();
croppedOutputI420Buffer.release();
}
@Test
@SmallTest
/** Test calling toI420() and comparing pixel content against I420 reference. */
public void testToI420() {
final VideoFrame.I420Buffer referenceI420Buffer = createTestI420Buffer();
final VideoFrame.Buffer bufferToTest = createBufferToTest(referenceI420Buffer);
final VideoFrame.I420Buffer outputI420Buffer = bufferToTest.toI420();
bufferToTest.release();
assertAlmostEqualI420Buffers(referenceI420Buffer, outputI420Buffer);
referenceI420Buffer.release();
outputI420Buffer.release();
}
@Test
@SmallTest
/** Pure 2x scaling with no cropping. */
public void testScale2x() {
testCropAndScale(0 /* cropX= */, 0 /* cropY= */, /* cropWidth= */ 16, /* cropHeight= */ 16,
/* scaleWidth= */ 8, /* scaleHeight= */ 8);
}
@Test
@SmallTest
/** Test cropping only X direction, with no scaling. */
public void testCropX() {
testCropAndScale(8 /* cropX= */, 0 /* cropY= */, /* cropWidth= */ 8, /* cropHeight= */ 16,
/* scaleWidth= */ 8, /* scaleHeight= */ 16);
}
@Test
@SmallTest
/** Test cropping only Y direction, with no scaling. */
public void testCropY() {
testCropAndScale(0 /* cropX= */, 8 /* cropY= */, /* cropWidth= */ 16, /* cropHeight= */ 8,
/* scaleWidth= */ 16, /* scaleHeight= */ 8);
}
@Test
@SmallTest
/** Test center crop, with no scaling. */
public void testCenterCrop() {
testCropAndScale(4 /* cropX= */, 4 /* cropY= */, /* cropWidth= */ 8, /* cropHeight= */ 8,
/* scaleWidth= */ 8, /* scaleHeight= */ 8);
}
@Test
@SmallTest
/** Test non-center crop for right bottom corner, with no scaling. */
public void testRightBottomCornerCrop() {
testCropAndScale(8 /* cropX= */, 8 /* cropY= */, /* cropWidth= */ 8, /* cropHeight= */ 8,
/* scaleWidth= */ 8, /* scaleHeight= */ 8);
}
@Test
@SmallTest
/** Test combined cropping and scaling. */
public void testCropAndScale() {
testCropAndScale(4 /* cropX= */, 4 /* cropY= */, /* cropWidth= */ 12, /* cropHeight= */ 12,
/* scaleWidth= */ 8, /* scaleHeight= */ 8);
}
}