ByteArrayDataSource.java
/*
* Copyright (C) 2016 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.datasource;
import static java.lang.Math.min;
import android.net.Uri;
import androidx.annotation.Nullable;
import androidx.media3.common.C;
import androidx.media3.common.PlaybackException;
import androidx.media3.common.util.Assertions;
import androidx.media3.common.util.UnstableApi;
import java.io.IOException;
/** A {@link DataSource} for reading from a byte array. */
@UnstableApi
public final class ByteArrayDataSource extends BaseDataSource {
private final byte[] data;
@Nullable private Uri uri;
private int readPosition;
private int bytesRemaining;
private boolean opened;
/** @param data The data to be read. */
public ByteArrayDataSource(byte[] data) {
super(/* isNetwork= */ false);
Assertions.checkNotNull(data);
Assertions.checkArgument(data.length > 0);
this.data = data;
}
@Override
public long open(DataSpec dataSpec) throws IOException {
uri = dataSpec.uri;
transferInitializing(dataSpec);
if (dataSpec.position > data.length) {
throw new DataSourceException(PlaybackException.ERROR_CODE_IO_READ_POSITION_OUT_OF_RANGE);
}
readPosition = (int) dataSpec.position;
bytesRemaining = data.length - (int) dataSpec.position;
if (dataSpec.length != C.LENGTH_UNSET) {
bytesRemaining = (int) min(bytesRemaining, dataSpec.length);
}
opened = true;
transferStarted(dataSpec);
return dataSpec.length != C.LENGTH_UNSET ? dataSpec.length : bytesRemaining;
}
@Override
public int read(byte[] buffer, int offset, int length) {
if (length == 0) {
return 0;
} else if (bytesRemaining == 0) {
return C.RESULT_END_OF_INPUT;
}
length = min(length, bytesRemaining);
System.arraycopy(data, readPosition, buffer, offset, length);
readPosition += length;
bytesRemaining -= length;
bytesTransferred(length);
return length;
}
@Override
@Nullable
public Uri getUri() {
return uri;
}
@Override
public void close() {
if (opened) {
opened = false;
transferEnded();
}
uri = null;
}
}