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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.decoder;
/**
* Maintains decoder event counts, for debugging purposes only.
* <p>
* Counters should be written from the playback thread only. Counters may be read from any thread.
* To ensure that the counter values are made visible across threads, users of this class should
* invoke {@link #ensureUpdated()} prior to reading and after writing.
*/
public final class DecoderCounters {
/**
* The number of times a decoder has been initialized.
*/
public int decoderInitCount;
/**
* The number of times a decoder has been released.
*/
public int decoderReleaseCount;
/**
* The number of queued input buffers.
*/
public int inputBufferCount;
/**
* The number of skipped input buffers.
* <p>
* A skipped input buffer is an input buffer that was deliberately not sent to the decoder.
*/
public int skippedInputBufferCount;
/**
* The number of rendered output buffers.
*/
public int renderedOutputBufferCount;
/**
* The number of skipped output buffers.
* <p>
* A skipped output buffer is an output buffer that was deliberately not rendered.
*/
public int skippedOutputBufferCount;
/**
* The number of dropped buffers.
* <p>
* A dropped buffer is an buffer that was supposed to be decoded/rendered, but was instead
* dropped because it could not be rendered in time.
*/
public int droppedBufferCount;
/**
* The maximum number of dropped buffers without an interleaving rendered output buffer.
* <p>
* Skipped output buffers are ignored for the purposes of calculating this value.
*/
public int maxConsecutiveDroppedBufferCount;
/**
* The number of times all buffers to a keyframe were dropped.
* <p>
* Each time buffers to a keyframe are dropped, this counter is increased by one, and the dropped
* buffer counters are increased by one (for the current output buffer) plus the number of buffers
* dropped from the source to advance to the keyframe.
*/
public int droppedToKeyframeCount;
/**
* Should be called to ensure counter values are made visible across threads. The playback thread
* should call this method after updating the counter values. Any other thread should call this
* method before reading the counters.
*/
public synchronized void ensureUpdated() {
// Do nothing. The use of synchronized ensures a memory barrier should another thread also
// call this method.
}
/**
* Merges the counts from {@code other} into this instance.
*
* @param other The {@link DecoderCounters} to merge into this instance.
*/
public void merge(DecoderCounters other) {
decoderInitCount += other.decoderInitCount;
decoderReleaseCount += other.decoderReleaseCount;
inputBufferCount += other.inputBufferCount;
skippedInputBufferCount += other.skippedInputBufferCount;
renderedOutputBufferCount += other.renderedOutputBufferCount;
skippedOutputBufferCount += other.skippedOutputBufferCount;
droppedBufferCount += other.droppedBufferCount;
maxConsecutiveDroppedBufferCount = Math.max(maxConsecutiveDroppedBufferCount,
other.maxConsecutiveDroppedBufferCount);
droppedToKeyframeCount += other.droppedToKeyframeCount;
}
}
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