/*
* Copyright 2010 Fred Sauer
*
* 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 com.allen_sauer.gwt.voices.client;
import static com.allen_sauer.gwt.voices.client.Sound.LoadState.LOAD_STATE_NOT_SUPPORTED;
import static com.allen_sauer.gwt.voices.client.Sound.LoadState.LOAD_STATE_SUPPORTED_NOT_READY;
import static com.allen_sauer.gwt.voices.client.Sound.LoadState.LOAD_STATE_SUPPORT_NOT_KNOWN;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.dom.client.Element;
import com.allen_sauer.gwt.voices.client.SoundController.MimeTypeSupport;
/**
* Sound object using the Web Audio API.
*/
public class WebAudioSound extends AbstractSound {
// CHECKSTYLE_JAVADOC_OFF
private String mimeType;
private Element voice;
private static Element audioContext;
private JavaScriptObject buffer;
private int volume;
private boolean looping;
public static MimeTypeSupport getMimeTypeSupport(String mimeType) {
if (audioContext == null) {
return MimeTypeSupport.MIME_TYPE_NOT_SUPPORTED;
}
return Html5Sound.getMimeTypeSupport(mimeType);
}
public WebAudioSound(String mimeType, String url, boolean streaming, boolean crossOrigin) {
super(mimeType, url, streaming, crossOrigin);
this.mimeType = mimeType;
try {
createVoice(url, crossOrigin);
} catch (Throwable e) {
setLoadState(LOAD_STATE_NOT_SUPPORTED);
}
MimeTypeSupport mimeTypeSupport = getMimeTypeSupport(mimeType);
switch (mimeTypeSupport) {
case MIME_TYPE_SUPPORT_READY:
setLoadState(LOAD_STATE_SUPPORTED_NOT_READY);
break;
case MIME_TYPE_NOT_SUPPORTED:
setLoadState(LOAD_STATE_NOT_SUPPORTED);
break;
case MIME_TYPE_SUPPORT_UNKNOWN:
setLoadState(LOAD_STATE_SUPPORT_NOT_KNOWN);
break;
case MIME_TYPE_SUPPORT_NOT_READY:
setLoadState(LOAD_STATE_SUPPORTED_NOT_READY);
break;
default:
throw new IllegalArgumentException("unknown MIME type support " + mimeTypeSupport);
}
}
static {
audioContext = createAudioContext();
}
private static native Element createAudioContext() /*-{
try {
return new AudioContext();
} catch (ignore) {
}
try {
return new webkitAudioContext();
} catch (ignore) {
}
return null;
}-*/;
private native void createVoice(String url, boolean crossOrigin) /*-{
var context = @com.allen_sauer.gwt.voices.client.WebAudioSound::audioContext;
// TODO: Implement XDomainRequest for IE
var request = new $wnd.XMLHttpRequest();
request.open("GET", url, true);
request.responseType = "arraybuffer";
var self = this;
request.onload = function() {
try {
self.@com.allen_sauer.gwt.voices.client.WebAudioSound::buffer = context
.createBuffer(request.response, false);
self.@com.allen_sauer.gwt.voices.client.WebAudioSound::soundLoaded()();
} catch(e) {
self.@com.allen_sauer.gwt.voices.client.WebAudioSound::soundLoadFailed()();
}
}
request.send();
}-*/;
private void soundLoadFailed() {
setLoadState(LoadState.LOAD_STATE_NOT_SUPPORTED);
}
private void soundLoaded() {
setLoadState(LoadState.LOAD_STATE_SUPPORTED_AND_READY);
}
@Override
public int getBalance() {
// TODO(fredsa): Auto-generated method stub
return 0;
}
@Override
public boolean getLooping() {
return looping;
}
@Override
public int getVolume() {
return volume;
}
@Override
public native boolean play() /*-{
var buffer = this.@com.allen_sauer.gwt.voices.client.WebAudioSound::buffer;
if (buffer == null) {
// XHR has not yet returned
return false;
}
this.@com.allen_sauer.gwt.voices.client.WebAudioSound::stop()();
var context = @com.allen_sauer.gwt.voices.client.WebAudioSound::audioContext;
var voice = context.createBufferSource();
this.@com.allen_sauer.gwt.voices.client.WebAudioSound::voice = voice;
if (this.@com.allen_sauer.gwt.voices.client.WebAudioSound::looping) {
voice.loop = true;
}
var node = voice;
var volume = this.@com.allen_sauer.gwt.voices.client.WebAudioSound::volume;
if (volume != @com.allen_sauer.gwt.voices.client.SoundController::DEFAULT_VOLUME) {
var gainNode = context.createGainNode();
gainNode.gain.value = volume
/ @com.allen_sauer.gwt.voices.client.SoundController::DEFAULT_VOLUME;
node.connect(gainNode);
node = gainNode;
}
node.connect(context.destination);
voice.buffer = buffer;
voice.noteOn(context.currentTime);
// TODO Replace setTimeout() once https://bugs.webkit.org/show_bug.cgi?id=71942 is fixed
if (!voice.loop) {
var self = this;
setTimeout(
function() {
self.@com.allen_sauer.gwt.voices.client.WebAudioSound::plackbackCompleted()();
}, voice.buffer.duration * 1000);
}
return true;
}-*/;
private void plackbackCompleted() {
soundHandlerCollection.fireOnPlaybackComplete(this);
}
@Override
public void setBalance(int balance) {
// TODO(fredsa): Auto-generated method stub
}
@Override
public void setLooping(boolean looping) {
this.looping = looping;
}
@Override
public void setVolume(int volume) {
this.volume = volume;
}
@Override
public native void stop() /*-{
var context = @com.allen_sauer.gwt.voices.client.WebAudioSound::audioContext;
var voice = this.@com.allen_sauer.gwt.voices.client.WebAudioSound::voice;
if (voice == null) {
return;
}
voice.noteOff(context.currentTime);
this.@com.allen_sauer.gwt.voices.client.WebAudioSound::voice = null;
}-*/;
@Override
public String getSoundType() {
return "Web Audio";
}
}