mirror of
https://github.com/samsonjs/media.git
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8e58a3f5f5
1. Remove requirement for TrackRenderer implementations to report current position, unless they are time sources. 2. Expose whether renderers have media to play. The immediate benefit of this is to solve the referenced GitHub issue, and also to only display the appropriate Audio/Video/Text buttons in the demo app for the media being played. This is also a natural step toward multi-track support. Github issue: #541
76 lines
2 KiB
Java
76 lines
2 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 standalone {@link MediaClock}. The clock can be started, stopped and its time can be set and
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* retrieved. When started, this clock is based on {@link SystemClock#elapsedRealtime()}.
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*/
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/* package */ class StandaloneMediaClock implements 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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@Override
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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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