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/*
* Copyright (C) 2019 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 org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.mp3;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.SeekMap;
/**
* {@link SeekMap} that provides the end position of audio data and also allows mapping from
* position (byte offset) back to time, which can be used to work out the new sample basis timestamp
* after seeking and resynchronization.
*/
/* package */ interface Seeker extends SeekMap {
/**
* Maps a position (byte offset) to a corresponding sample timestamp.
*
* @param position A seek position (byte offset) relative to the start of the stream.
* @return The corresponding timestamp of the next sample to be read, in microseconds.
*/
long getTimeUs(long position);
/**
* Returns the position (byte offset) in the stream that is immediately after audio data, or
* {@link C#POSITION_UNSET} if not known.
*/
long getDataEndPosition();
/** A {@link Seeker} that does not support seeking through audio data. */
/* package */ class UnseekableSeeker extends SeekMap.Unseekable implements Seeker {
public UnseekableSeeker() {
super(/* durationUs= */ C.TIME_UNSET);
}
@Override
public long getTimeUs(long position) {
return 0;
}
@Override
public long getDataEndPosition() {
// Position unset as we do not know the data end position. Note that returning 0 doesn't work.
return C.POSITION_UNSET;
}
}
}
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