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/*
* 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 org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.ogg;
import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.ExtractorInput;
import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.SeekMap;
import java.io.IOException;
/**
* Used to seek in an Ogg stream. OggSeeker implementation may do direct seeking or progressive
* seeking. OggSeeker works together with a {@link SeekMap} instance to capture the queried position
* and start the seeking with an initial estimated position.
*/
/* package */ interface OggSeeker {
/**
* Returns a {@link SeekMap} that returns an initial estimated position for progressive seeking
* or the final position for direct seeking. Returns null if {@link #read} has yet to return -1.
*/
SeekMap createSeekMap();
/**
* Starts a seek operation.
*
* @param targetGranule The target granule position.
*/
void startSeek(long targetGranule);
/**
* Reads data from the {@link ExtractorInput} to build the {@link SeekMap} or to continue a seek.
* <p/>
* If more data is required or if the position of the input needs to be modified then a position
* from which data should be provided is returned. Else a negative value is returned. If a seek
* has been completed then the value returned is -(currentGranule + 2). Else it is -1.
*
* @param input The {@link ExtractorInput} to read from.
* @return A non-negative position to seek the {@link ExtractorInput} to, or -(currentGranule + 2)
* if the progressive seek has completed, or -1 otherwise.
* @throws IOException If reading from the {@link ExtractorInput} fails.
* @throws InterruptedException If the thread is interrupted.
*/
long read(ExtractorInput input) throws IOException, InterruptedException;
}
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