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Use audio passthrough if flattening is requested but not needed.

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When the input is not a slow motion video, then flattening should do
nothing, so there is no need to re-encode audio.

PiperOrigin-RevId: 412443097
This commit is contained in:
hschlueter 2021-11-26 14:47:27 +00:00 committed by tonihei
parent 51762a4795
commit 041c3e9971
1 changed files with 22 additions and 3 deletions
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25
library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerAudioRenderer.java
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@ -19,12 +19,15 @@ package com.google.android.exoplayer2.transformer;
import static com.google.android.exoplayer2.source.SampleStream.FLAG_REQUIRE_FORMAT;
import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import com.google.android.exoplayer2.C;
import com.google.android.exoplayer2.ExoPlaybackException;
import com.google.android.exoplayer2.Format;
import com.google.android.exoplayer2.FormatHolder;
import com.google.android.exoplayer2.decoder.DecoderInputBuffer;
import com.google.android.exoplayer2.metadata.Metadata;
import com.google.android.exoplayer2.metadata.mp4.SlowMotionData;
import com.google.android.exoplayer2.source.SampleStream.ReadDataResult;
@RequiresApi(18)
@ -59,13 +62,29 @@ import com.google.android.exoplayer2.source.SampleStream.ReadDataResult;
return false;
}
Format inputFormat = checkNotNull(formatHolder.format);
if ((transformation.audioMimeType != null
&& !transformation.audioMimeType.equals(inputFormat.sampleMimeType))
|| transformation.flattenForSlowMotion) {
boolean shouldChangeMimeType =
transformation.audioMimeType != null
&& !transformation.audioMimeType.equals(inputFormat.sampleMimeType);
boolean shouldFlattenForSlowMotion =
transformation.flattenForSlowMotion && isSlowMotion(inputFormat);
if (shouldChangeMimeType || shouldFlattenForSlowMotion) {
samplePipeline = new AudioSamplePipeline(inputFormat, transformation, getIndex());
} else {
samplePipeline = new PassthroughSamplePipeline(inputFormat);
}
return true;
}
private static boolean isSlowMotion(Format format) {
@Nullable Metadata metadata = format.metadata;
if (metadata == null) {
return false;
}
for (int i = 0; i < metadata.length(); i++) {
if (metadata.get(i) instanceof SlowMotionData) {
return true;
}
}
return false;
}
}