CueDecoder.java
/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.media3.extractor.text;
import android.os.Bundle;
import android.os.Parcel;
import androidx.media3.common.text.Cue;
import androidx.media3.common.util.Assertions;
import androidx.media3.common.util.BundleableUtil;
import androidx.media3.common.util.UnstableApi;
import java.util.ArrayList;
import java.util.List;
/** Decodes data encoded by {@link CueEncoder}. */
@UnstableApi
public final class CueDecoder {
/** Key under which the list of cues is saved in the {@link Bundle}. */
/* package */ static final String BUNDLE_FIELD_CUES = "c";
/** Key under which the duration is saved in the {@link Bundle}. */
/* package */ static final String BUNDLE_FIELD_DURATION_US = "d";
/**
* Decodes a byte array into a {@link CuesWithTiming} instance.
*
* @param startTimeUs The value for {@link CuesWithTiming#startTimeUs} (this is not encoded in
* {@code bytes}).
* @param bytes Byte array produced by {@link CueEncoder#encode(List, long)}
* @return Decoded {@link CuesWithTiming} instance.
*/
public CuesWithTiming decode(long startTimeUs, byte[] bytes) {
Parcel parcel = Parcel.obtain();
parcel.unmarshall(bytes, 0, bytes.length);
parcel.setDataPosition(0);
Bundle bundle = parcel.readBundle(Bundle.class.getClassLoader());
parcel.recycle();
ArrayList<Bundle> bundledCues =
Assertions.checkNotNull(bundle.getParcelableArrayList(BUNDLE_FIELD_CUES));
return new CuesWithTiming(
BundleableUtil.fromBundleList(Cue.CREATOR, bundledCues),
startTimeUs,
bundle.getLong(BUNDLE_FIELD_DURATION_US));
}
}