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Move util methods in SpeedChangingAudioProcessorto Util

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This CL is prework for implementing
`RandomParameterizedSpeedChangingAudioProcessorTest`, which will build
on logic present in `RandomParameterizedSonicTest`.

This is a non-functional change.

PiperOrigin-RevId: 684838017
This commit is contained in:
ivanbuper 2024-10-11 07:58:46 -07:00 committed by Copybara-Service
parent 984b0bb31a
commit 337e59e733
2 changed files with 41 additions and 11 deletions
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17
libraries/common/src/test/java/androidx/media3/common/audio/RandomParameterizedSonicTest.java
View File

@ -15,6 +15,8 @@
*/
package androidx.media3.common.audio;
import static androidx.media3.test.utils.TestUtil.generateFloatInRange;
import static androidx.media3.test.utils.TestUtil.roundToDecimalPlaces;
import static com.google.common.truth.Truth.assertThat;
import static java.lang.Math.max;
@ -97,8 +99,10 @@ public final class RandomParameterizedSonicTest {
ImmutableSet.Builder<Float> speedsBuilder = new ImmutableSet.Builder<>();
for (int i = 0; i < PARAM_COUNT; i++) {
Range<Float> r = SPEED_RANGES.get(i % SPEED_RANGES.size());
speedsBuilder.add(round(generateFloatInRange(r)));
Range<Float> range = SPEED_RANGES.get(i % SPEED_RANGES.size());
speedsBuilder.add(
(float)
roundToDecimalPlaces(generateFloatInRange(random, range), SPEED_DECIMAL_PRECISION));
}
ImmutableSet<Float> speeds = speedsBuilder.build();
@ -235,13 +239,4 @@ public final class RandomParameterizedSonicTest {
assertThat(readSampleCount).isWithin(tolerance).of(expectedSampleCount.longValueExact());
}
private static float round(float num) {
BigDecimal bigDecimal = new BigDecimal(Float.toString(num));
return bigDecimal.setScale(SPEED_DECIMAL_PRECISION, RoundingMode.HALF_EVEN).floatValue();
}
private static float generateFloatInRange(Range<Float> r) {
return r.lowerEndpoint() + random.nextFloat() * (r.upperEndpoint() - r.lowerEndpoint());
}
}

35
libraries/test_utils/src/main/java/androidx/media3/test/utils/TestUtil.java
View File

@ -51,7 +51,9 @@ import androidx.media3.extractor.ExtractorInput;
import androidx.media3.extractor.PositionHolder;
import androidx.media3.extractor.SeekMap;
import androidx.media3.extractor.metadata.MetadataInputBuffer;
import com.google.common.collect.BoundType;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Range;
import com.google.common.io.ByteStreams;
import com.google.common.primitives.Bytes;
import com.google.common.primitives.UnsignedBytes;
@ -63,6 +65,8 @@ import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
@ -663,6 +667,37 @@ public class TestUtil {
return checkNotNull(parcel.readBundle(throwingClassLoader));
}
/**
* Returns a randomly generated float within the specified range, using {@code random} as random
* number generator.
*
* <p>{@code range} must be a bounded range.
*/
public static float generateFloatInRange(Random random, Range<Float> range) {
float bottom =
range.lowerBoundType() == BoundType.OPEN
? Math.nextUp(range.lowerEndpoint())
: range.lowerEndpoint();
float top =
range.upperBoundType() == BoundType.OPEN
? Math.nextDown(range.upperEndpoint())
: range.upperEndpoint();
return bottom + random.nextFloat() * (top - bottom);
}
/**
* Rounds {@code num} to {@code decimalPlaces}, using {@link RoundingMode#HALF_EVEN}.
*
* <p>The number is converted first into a {@link BigDecimal} on which the scale is set to {@code
* decimalPlaces}. Finally, the method returns the {@link BigDecimal#doubleValue()} of the scaled
* big decimal.
*/
public static double roundToDecimalPlaces(double num, int decimalPlaces) {
BigDecimal bigDecimal = new BigDecimal(Double.toString(num));
return bigDecimal.setScale(decimalPlaces, RoundingMode.HALF_EVEN).doubleValue();
}
private static final class NoUidOrShufflingTimeline extends Timeline {
private final Timeline delegate;