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https://github.com/samsonjs/media.git
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027d9eefbd
Propagate elapsedRealtimeUs to the video renderer. This allows the renderer to calculate and adjust for the elapsed time since the start of the current rendering loop. Typically this is <2ms, but there situations where it can go higher (normally when the video renderer ends up processing more than 1 output buffer in a single loop). Also made variable naming more consistent throughout the package.
79 lines
2.1 KiB
Java
79 lines
2.1 KiB
Java
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.exoplayer;
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import android.os.SystemClock;
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/**
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* A simple clock for tracking the progression of media time. The clock can be started, stopped and
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* its time can be set and retrieved. When started, this clock is based on
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* {@link SystemClock#elapsedRealtime()}.
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*/
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/* package */ class MediaClock {
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private boolean started;
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/**
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* The media time when the clock was last set or stopped.
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*/
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private long positionUs;
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/**
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* The difference between {@link SystemClock#elapsedRealtime()} and {@link #positionUs}
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* when the clock was last set or started.
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*/
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private long deltaUs;
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/**
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* Starts the clock. Does nothing if the clock is already started.
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*/
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public void start() {
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if (!started) {
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started = true;
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deltaUs = elapsedRealtimeMinus(positionUs);
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}
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}
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/**
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* Stops the clock. Does nothing if the clock is already stopped.
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*/
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public void stop() {
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if (started) {
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positionUs = elapsedRealtimeMinus(deltaUs);
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started = false;
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}
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}
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/**
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* @param timeUs The position to set in microseconds.
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*/
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public void setPositionUs(long timeUs) {
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this.positionUs = timeUs;
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deltaUs = elapsedRealtimeMinus(timeUs);
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}
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/**
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* @return The current position in microseconds.
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*/
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public long getPositionUs() {
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return started ? elapsedRealtimeMinus(deltaUs) : positionUs;
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}
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private long elapsedRealtimeMinus(long toSubtractUs) {
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return SystemClock.elapsedRealtime() * 1000 - toSubtractUs;
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}
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}
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