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Commit 9e62ea3f by andrewlewis Committed by Ian Baker
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Move image buffer extraction to test thread 

This also ensures that if there's an error reading the image data then this
gets surfaced as an analysis exception.

PiperOrigin-RevId: 435680785
parent 12543a96
Inline Side-by-side
Showing with 57 additions and 121 deletions
libraries/transformer/src/androidTest/java/androidx/media3/transformer/SsimHelper.java
...@@ -20,6 +20,7 @@ import static androidx.media3.common.util.Assertions.checkNotNull; ...@@ -20,6 +20,7 @@ import static androidx.media3.common.util.Assertions.checkNotNull;
import static androidx.media3.common.util.Assertions.checkState; import static androidx.media3.common.util.Assertions.checkState;
import static androidx.media3.common.util.Assertions.checkStateNotNull; import static androidx.media3.common.util.Assertions.checkStateNotNull;
import static com.google.common.truth.Truth.assertThat; import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static java.lang.Math.pow; import static java.lang.Math.pow;
import android.content.Context; import android.content.Context;
...@@ -33,15 +34,12 @@ import android.media.MediaExtractor; ...@@ -33,15 +34,12 @@ import android.media.MediaExtractor;
import android.media.MediaFormat; import android.media.MediaFormat;
import android.os.Handler; import android.os.Handler;
import androidx.annotation.Nullable; import androidx.annotation.Nullable;
import androidx.media3.common.Format;
import androidx.media3.common.MimeTypes; import androidx.media3.common.MimeTypes;
import androidx.media3.common.util.ConditionVariable;
import androidx.media3.common.util.Util; import androidx.media3.common.util.Util;
import java.io.Closeable; import java.io.Closeable;
import java.io.IOException; import java.io.IOException;
import java.nio.ByteBuffer; import java.nio.ByteBuffer;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
/** /**
* A helper for calculating SSIM score for transcoded videos. * A helper for calculating SSIM score for transcoded videos.
...@@ -58,26 +56,8 @@ public final class SsimHelper { ...@@ -58,26 +56,8 @@ public final class SsimHelper {
/** The default comparison interval. */ /** The default comparison interval. */
public static final int DEFAULT_COMPARISON_INTERVAL = 11; public static final int DEFAULT_COMPARISON_INTERVAL = 11;
private static final int SURFACE_WAIT_MS = 10; private static final int IMAGE_AVAILABLE_TIMEOUT_MS = 10_000;
private static final int DECODED_IMAGE_CHANNEL_COUNT = 3; private static final int DECODED_IMAGE_CHANNEL_COUNT = 3;
private static final int[] EMPTY_BUFFER = new int[0];
private final Context context;
private final String expectedVideoPath;
private final String actualVideoPath;
private final int comparisonInterval;
private @MonotonicNonNull VideoDecodingWrapper expectedDecodingWrapper;
private @MonotonicNonNull VideoDecodingWrapper actualDecodingWrapper;
private double accumulatedSsim;
private int comparedImagesCount;
// These atomic fields are read on both test thread (where MediaCodec is controlled) and set on
// the main thread (where ImageReader invokes its callback).
private final AtomicReference<int[]> expectedLumaBuffer;
private final AtomicReference<int[]> actualLumaBuffer;
private final AtomicInteger width;
private final AtomicInteger height;
/** /**
* Returns the mean SSIM score between the expected and the actual video. * Returns the mean SSIM score between the expected and the actual video.
...@@ -92,95 +72,49 @@ public final class SsimHelper { ...@@ -92,95 +72,49 @@ public final class SsimHelper {
*/ */
public static double calculate(Context context, String expectedVideoPath, String actualVideoPath) public static double calculate(Context context, String expectedVideoPath, String actualVideoPath)
throws IOException, InterruptedException { throws IOException, InterruptedException {
return new SsimHelper(context, expectedVideoPath, actualVideoPath, DEFAULT_COMPARISON_INTERVAL) VideoDecodingWrapper expectedDecodingWrapper =
.calculateSsim(); new VideoDecodingWrapper(context, expectedVideoPath, DEFAULT_COMPARISON_INTERVAL);
} VideoDecodingWrapper actualDecodingWrapper =
new VideoDecodingWrapper(context, actualVideoPath, DEFAULT_COMPARISON_INTERVAL);
private SsimHelper( double accumulatedSsim = 0.0;
Context context, String expectedVideoPath, String actualVideoPath, int comparisonInterval) { int comparedImagesCount = 0;
this.context = context;
this.expectedVideoPath = expectedVideoPath;
this.actualVideoPath = actualVideoPath;
this.comparisonInterval = comparisonInterval;
this.expectedLumaBuffer = new AtomicReference<>(EMPTY_BUFFER);
this.actualLumaBuffer = new AtomicReference<>(EMPTY_BUFFER);
this.width = new AtomicInteger(Format.NO_VALUE);
this.height = new AtomicInteger(Format.NO_VALUE);
}
/** Calculates the SSIM score between the two videos. */
private double calculateSsim() throws InterruptedException, IOException {
// The test thread has no looper, so a handler is created on which the
// ImageReader.OnImageAvailableListener is called.
Handler mainThreadHandler = Util.createHandlerForCurrentOrMainLooper();
ImageReader.OnImageAvailableListener onImageAvailableListener = this::onImageAvailableListener;
expectedDecodingWrapper =
new VideoDecodingWrapper(
context,
expectedVideoPath,
onImageAvailableListener,
mainThreadHandler,
comparisonInterval);
actualDecodingWrapper =
new VideoDecodingWrapper(
context,
actualVideoPath,
onImageAvailableListener,
mainThreadHandler,
comparisonInterval);
try { try {
while (!expectedDecodingWrapper.hasEnded() && !actualDecodingWrapper.hasEnded()) { while (true) {
if (!expectedDecodingWrapper.runUntilComparisonFrameOrEnded() @Nullable Image expectedImage = expectedDecodingWrapper.runUntilComparisonFrameOrEnded();
|| !actualDecodingWrapper.runUntilComparisonFrameOrEnded()) { @Nullable Image actualImage = actualDecodingWrapper.runUntilComparisonFrameOrEnded();
continue; if (expectedImage == null) {
assertThat(actualImage).isNull();
break;
} }
checkNotNull(actualImage);
while (expectedLumaBuffer.get() == EMPTY_BUFFER || actualLumaBuffer.get() == EMPTY_BUFFER) {
// Wait for the ImageReader to call onImageAvailable and process the luma channel on the int width = expectedImage.getWidth();
// main thread. int height = expectedImage.getHeight();
Thread.sleep(SURFACE_WAIT_MS); assertThat(actualImage.getWidth()).isEqualTo(width);
assertThat(actualImage.getHeight()).isEqualTo(height);
try {
accumulatedSsim +=
SsimCalculator.calculate(
extractLumaChannelBuffer(expectedImage),
extractLumaChannelBuffer(actualImage),
/* offset= */ 0,
/* stride= */ width,
width,
height);
} finally {
expectedImage.close();
actualImage.close();
} }
accumulatedSsim +=
SsimCalculator.calculate(
expectedLumaBuffer.get(),
actualLumaBuffer.get(),
/* offset= */ 0,
/* stride= */ width.get(),
width.get(),
height.get());
comparedImagesCount++; comparedImagesCount++;
expectedLumaBuffer.set(EMPTY_BUFFER);
actualLumaBuffer.set(EMPTY_BUFFER);
} }
} finally { } finally {
expectedDecodingWrapper.close(); expectedDecodingWrapper.close();
actualDecodingWrapper.close(); actualDecodingWrapper.close();
} }
assertWithMessage("Input had no frames.").that(comparedImagesCount).isGreaterThan(0);
if (comparedImagesCount == 0) {
throw new IOException("Input had no frames.");
}
return accumulatedSsim / comparedImagesCount; return accumulatedSsim / comparedImagesCount;
} }
private void onImageAvailableListener(ImageReader imageReader) {
// This method is invoked on the main thread.
Image image = imageReader.acquireLatestImage();
int[] lumaBuffer = extractLumaChannelBuffer(image);
width.set(image.getWidth());
height.set(image.getHeight());
image.close();
if (imageReader == checkNotNull(expectedDecodingWrapper).imageReader) {
expectedLumaBuffer.set(lumaBuffer);
} else if (imageReader == checkNotNull(actualDecodingWrapper).imageReader) {
actualLumaBuffer.set(lumaBuffer);
} else {
throw new IllegalStateException("Unexpected ImageReader.");
}
}
/** /**
* Returns the buffer of the luma (Y) channel of the image. * Returns the buffer of the luma (Y) channel of the image.
* *
...@@ -206,6 +140,10 @@ public final class SsimHelper { ...@@ -206,6 +140,10 @@ public final class SsimHelper {
return lumaChannelBuffer; return lumaChannelBuffer;
} }
private SsimHelper() {
// Prevent instantiation.
}
private static final class VideoDecodingWrapper implements Closeable { private static final class VideoDecodingWrapper implements Closeable {
// Use ExoPlayer's 10ms timeout setting. In practise, the test durations from using timeouts of // Use ExoPlayer's 10ms timeout setting. In practise, the test durations from using timeouts of
// 1/10/100ms don't differ significantly. // 1/10/100ms don't differ significantly.
...@@ -221,6 +159,7 @@ public final class SsimHelper { ...@@ -221,6 +159,7 @@ public final class SsimHelper {
private final MediaExtractor mediaExtractor; private final MediaExtractor mediaExtractor;
private final MediaCodec.BufferInfo bufferInfo; private final MediaCodec.BufferInfo bufferInfo;
private final ImageReader imageReader; private final ImageReader imageReader;
private final ConditionVariable imageAvailableConditionVariable;
private final int comparisonInterval; private final int comparisonInterval;
private boolean isCurrentFrameComparisonFrame; private boolean isCurrentFrameComparisonFrame;
...@@ -234,18 +173,11 @@ public final class SsimHelper { ...@@ -234,18 +173,11 @@ public final class SsimHelper {
* *
* @param context The {@link Context}. * @param context The {@link Context}.
* @param filePath The path to the video file. * @param filePath The path to the video file.
* @param imageAvailableListener An {@link ImageReader.OnImageAvailableListener} implementation.
* @param handler The {@link Handler} on which the {@code imageAvailableListener} is called.
* @param comparisonInterval The number of frames between the frames selected for comparison by * @param comparisonInterval The number of frames between the frames selected for comparison by
* SSIM. * SSIM.
* @throws IOException When failed to open the video file. * @throws IOException When failed to open the video file.
*/ */
public VideoDecodingWrapper( public VideoDecodingWrapper(Context context, String filePath, int comparisonInterval)
Context context,
String filePath,
ImageReader.OnImageAvailableListener imageAvailableListener,
Handler handler,
int comparisonInterval)
throws IOException { throws IOException {
this.comparisonInterval = comparisonInterval; this.comparisonInterval = comparisonInterval;
mediaExtractor = new MediaExtractor(); mediaExtractor = new MediaExtractor();
...@@ -275,9 +207,14 @@ public final class SsimHelper { ...@@ -275,9 +207,14 @@ public final class SsimHelper {
checkState(mediaFormat.containsKey(MediaFormat.KEY_HEIGHT)); checkState(mediaFormat.containsKey(MediaFormat.KEY_HEIGHT));
int height = mediaFormat.getInteger(MediaFormat.KEY_HEIGHT); int height = mediaFormat.getInteger(MediaFormat.KEY_HEIGHT);
// Create a handler for the main thread to receive image available notifications. The current
// (test) thread blocks until this callback is received.
Handler mainThreadHandler = Util.createHandlerForCurrentOrMainLooper();
imageAvailableConditionVariable = new ConditionVariable();
imageReader = imageReader =
ImageReader.newInstance(width, height, IMAGE_READER_COLOR_SPACE, MAX_IMAGES_ALLOWED); ImageReader.newInstance(width, height, IMAGE_READER_COLOR_SPACE, MAX_IMAGES_ALLOWED);
imageReader.setOnImageAvailableListener(imageAvailableListener, handler); imageReader.setOnImageAvailableListener(
imageReader -> imageAvailableConditionVariable.open(), mainThreadHandler);
String sampleMimeType = checkNotNull(mediaFormat.getString(MediaFormat.KEY_MIME)); String sampleMimeType = checkNotNull(mediaFormat.getString(MediaFormat.KEY_MIME));
mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, MEDIA_CODEC_COLOR_SPACE); mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, MEDIA_CODEC_COLOR_SPACE);
...@@ -288,29 +225,28 @@ public final class SsimHelper { ...@@ -288,29 +225,28 @@ public final class SsimHelper {
} }
/** /**
* Run decoding until a comparison frame is rendered, or decoding has ended. * Returns the next decoded comparison frame, or {@code null} if the stream has ended. The
* * caller takes ownership of any returned image and is responsible for closing it before calling
* <p>The method returns after rendering the comparison frame. There is no guarantee that the * this method again.
* frame is available for processing at this time.
*
* @return {@code true} when a comparison frame is encountered, or {@code false} if decoding
* {@link #hasEnded() had ended}.
*/ */
public boolean runUntilComparisonFrameOrEnded() { @Nullable
public Image runUntilComparisonFrameOrEnded() throws InterruptedException {
while (!hasEnded() && !isCurrentFrameComparisonFrame) { while (!hasEnded() && !isCurrentFrameComparisonFrame) {
while (dequeueOneFrameFromDecoder()) {} while (dequeueOneFrameFromDecoder()) {}
while (queueOneFrameToDecoder()) {} while (queueOneFrameToDecoder()) {}
} }
if (isCurrentFrameComparisonFrame) { if (isCurrentFrameComparisonFrame) {
isCurrentFrameComparisonFrame = false; isCurrentFrameComparisonFrame = false;
return true; assertThat(imageAvailableConditionVariable.block(IMAGE_AVAILABLE_TIMEOUT_MS)).isTrue();
imageAvailableConditionVariable.close();
return imageReader.acquireLatestImage();
} }
return false; return null;
} }
/** Returns whether decoding has ended. */ /** Returns whether decoding has ended. */
public boolean hasEnded() { private boolean hasEnded() {
return queuedEndOfStreamToDecoder && dequeuedAllDecodedFrames; return dequeuedAllDecodedFrames;
} }
/** Returns whether a frame is queued to the {@link MediaCodec decoder}. */ /** Returns whether a frame is queued to the {@link MediaCodec decoder}. */
......
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