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Compositor: Use timestamps for compositing.

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For now, just identical timestamps. A follow-up CL will allow for different
framerates. Prior tests already send identical timestamp frames, so no new
tests were added

PiperOrigin-RevId: 548676759
This commit is contained in:
huangdarwin 2023-07-17 14:50:14 +01:00 committed by Ian Baker
parent 81ef52763d
commit 836720ebfa
1 changed files with 17 additions and 4 deletions
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21
libraries/effect/src/main/java/androidx/media3/effect/VideoCompositor.java
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@ -26,6 +26,7 @@ import android.opengl.GLES20;
import androidx.annotation.GuardedBy;
import androidx.annotation.IntRange;
import androidx.annotation.Nullable;
import androidx.media3.common.C;
import androidx.media3.common.GlObjectsProvider;
import androidx.media3.common.GlTextureInfo;
import androidx.media3.common.VideoFrameProcessingException;
@ -45,11 +46,13 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
/**
* A basic VideoCompositor that takes in frames from exactly 2 input sources and combines it to one
* output.
*
* <p>The first {@linkplain #registerInputSource registered source} will be the primary stream,
* which is used to determine the output frames' timestamps and dimensions.
*/
@UnstableApi
public final class VideoCompositor {
// TODO: b/262694346 - Flesh out this implementation by doing the following:
// * Handle matched timestamps.
// * Handle mismatched timestamps
// * Before allowing customization of this class, add an interface, and rename this class to
// DefaultCompositor.
@ -217,12 +220,22 @@ public final class VideoCompositor {
if (outputTexturePool.freeTextureCount() == 0) {
return false;
}
// TODO: b/262694346 - Use timestamps to determine when to composite instead of number of
// frames.
long compositeTimestampUs = C.TIME_UNSET;
for (int inputId = 0; inputId < inputFrameInfos.size(); inputId++) {
if (checkNotNull(inputFrameInfos.get(inputId)).isEmpty()) {
Queue<InputFrameInfo> inputFrameInfoQueue = checkNotNull(inputFrameInfos.get(inputId));
if (inputFrameInfoQueue.isEmpty()) {
return false;
}
long inputTimestampUs = checkNotNull(inputFrameInfoQueue.peek()).presentationTimeUs;
if (inputId == 0) {
compositeTimestampUs = inputTimestampUs;
}
// TODO: b/262694346 - Allow for different frame-rates to be composited, by potentially
// dropping some frames in non-primary streams.
if (inputTimestampUs != compositeTimestampUs) {
throw new IllegalStateException("Non-matched timestamps not yet supported.");
}
}
return true;
}