Add the HTML5Audio class, to support the audio tag. (3d09e139) · Commits · e / os / android_frameworks_base

core/java/android/webkit/HTML5Audio.java

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+224 −0

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		/*
		* Copyright (C) 2010 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 android.webkit;

		import android.media.MediaPlayer;
		import android.media.MediaPlayer.OnBufferingUpdateListener;
		import android.media.MediaPlayer.OnCompletionListener;
		import android.media.MediaPlayer.OnErrorListener;
		import android.media.MediaPlayer.OnPreparedListener;
		import android.media.MediaPlayer.OnSeekCompleteListener;
		import android.os.Handler;
		import android.os.Message;
		import android.util.Log;

		import java.io.IOException;
		import java.util.Timer;
		import java.util.TimerTask;

		/**
		* <p>HTML5 support class for Audio.
		*/
		class HTML5Audio extends Handler
		implements MediaPlayer.OnBufferingUpdateListener,
		MediaPlayer.OnCompletionListener,
		MediaPlayer.OnErrorListener,
		MediaPlayer.OnPreparedListener,
		MediaPlayer.OnSeekCompleteListener {
		// Logging tag.
		private static final String LOGTAG = "HTML5Audio";

		private MediaPlayer mMediaPlayer;

		// The C++ MediaPlayerPrivateAndroid object.
		private int mNativePointer;

		private static int IDLE = 0;
		private static int INITIALIZED = 1;
		private static int PREPARED = 2;
		private static int STARTED = 4;
		private static int COMPLETE = 5;
		private static int PAUSED = 6;
		private static int STOPPED = -2;
		private static int ERROR = -1;

		private int mState = IDLE;

		private String mUrl;
		private boolean mAskToPlay = false;

		// Timer thread -> UI thread
		private static final int TIMEUPDATE = 100;

		// The spec says the timer should fire every 250 ms or less.
		private static final int TIMEUPDATE_PERIOD = 250; // ms
		// The timer for timeupate events.
		// See http://www.whatwg.org/specs/web-apps/current-work/#event-media-timeupdate
		private Timer mTimer;
		private final class TimeupdateTask extends TimerTask {
		public void run() {
		HTML5Audio.this.obtainMessage(TIMEUPDATE).sendToTarget();
		}
		}

		@Override
		public void handleMessage(Message msg) {
		switch (msg.what) {
		case TIMEUPDATE: {
		try {
		if (mState != ERROR && mMediaPlayer.isPlaying()) {
		int position = mMediaPlayer.getCurrentPosition();
		nativeOnTimeupdate(position, mNativePointer);
		}
		} catch (IllegalStateException e) {
		mState = ERROR;
		}
		}
		}
		}

		// event listeners for MediaPlayer
		// Those are called from the same thread we created the MediaPlayer
		// (i.e. the webviewcore thread here)

		// MediaPlayer.OnBufferingUpdateListener
		public void onBufferingUpdate(MediaPlayer mp, int percent) {
		nativeOnBuffering(percent, mNativePointer);
		}

		// MediaPlayer.OnCompletionListener;
		public void onCompletion(MediaPlayer mp) {
		resetMediaPlayer();
		mState = IDLE;
		nativeOnEnded(mNativePointer);
		}

		// MediaPlayer.OnErrorListener
		public boolean onError(MediaPlayer mp, int what, int extra) {
		mState = ERROR;
		resetMediaPlayer();
		mState = IDLE;
		return false;
		}

		// MediaPlayer.OnPreparedListener
		public void onPrepared(MediaPlayer mp) {
		mState = PREPARED;
		if (mTimer != null) {
		mTimer.schedule(new TimeupdateTask(),
		TIMEUPDATE_PERIOD, TIMEUPDATE_PERIOD);
		}
		nativeOnPrepared(mp.getDuration(), 0, 0, mNativePointer);
		if (mAskToPlay) {
		mAskToPlay = false;
		play();
		}
		}

		// MediaPlayer.OnSeekCompleteListener
		public void onSeekComplete(MediaPlayer mp) {
		nativeOnTimeupdate(mp.getCurrentPosition(), mNativePointer);
		}


		/**
		* @param nativePtr is the C++ pointer to the MediaPlayerPrivate object.
		*/
		public HTML5Audio(int nativePtr) {
		// Save the native ptr
		mNativePointer = nativePtr;
		resetMediaPlayer();
		}

		private void resetMediaPlayer() {
		if (mMediaPlayer == null) {
		mMediaPlayer = new MediaPlayer();
		} else {
		mMediaPlayer.reset();
		}
		mMediaPlayer.setOnBufferingUpdateListener(this);
		mMediaPlayer.setOnCompletionListener(this);
		mMediaPlayer.setOnErrorListener(this);
		mMediaPlayer.setOnPreparedListener(this);
		mMediaPlayer.setOnSeekCompleteListener(this);

		if (mTimer != null) {
		mTimer.cancel();
		}
		mTimer = new Timer();
		mState = IDLE;
		}

		private void setDataSource(String url) {
		mUrl = url;
		try {
		if (mState != IDLE) {
		resetMediaPlayer();
		}
		mMediaPlayer.setDataSource(url);
		mState = INITIALIZED;
		mMediaPlayer.prepareAsync();
		} catch (IOException e) {
		Log.e(LOGTAG, "couldn't load the resource: " + url + " exc: " + e);
		resetMediaPlayer();
		}
		}

		private void play() {
		if ((mState == ERROR \|\| mState == IDLE) && mUrl != null) {
		resetMediaPlayer();
		setDataSource(mUrl);
		mAskToPlay = true;
		}

		if (mState >= PREPARED) {
		mMediaPlayer.start();
		mState = STARTED;
		}
		}

		private void pause() {
		if (mState == STARTED) {
		if (mTimer != null) {
		mTimer.purge();
		}
		mMediaPlayer.pause();
		mState = PAUSED;
		}
		}

		private void seek(int msec) {
		if (mState >= PREPARED) {
		mMediaPlayer.seekTo(msec);
		}
		}

		private void teardown() {
		mMediaPlayer.release();
		mState = ERROR;
		mNativePointer = 0;
		}

		private float getMaxTimeSeekable() {
		return mMediaPlayer.getDuration() / 1000.0f;
		}

		private native void nativeOnBuffering(int percent, int nativePointer);
		private native void nativeOnEnded(int nativePointer);
		private native void nativeOnPrepared(int duration, int width, int height, int nativePointer);
		private native void nativeOnTimeupdate(int position, int nativePointer);
		}