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I have created a piece of code that seems to work in playing a sound file several times simultaneously, however, I am not sure if this is the best approach.

In essence, I am trying to create a simple web piano and I may use this approach later on in a game or something. The result is pretty perfect. I can play chords with no problems, with the exception of keyboard combo limits. If I were to move var request = new XMLHttpRequest(); to outside the functions making it a call-once global variable then the sound does not play simultaneously as it does now.

document.onkeydown = function(key)

 if(pitch[key.keyCode]!==undefined)
 Voice(pitch[key.keyCode]);


function Voice(pitch)

 var source = audioCtx.createBufferSource();
 var request = new XMLHttpRequest();
 request.open("GET","sample.wav",true);
 request.responseType = "arraybuffer";
 request.send();
 request.onload = function()
 
 var audioData = request.response;
 audioCtx.decodeAudioData(audioData, function(buffer)
 
 source.buffer = buffer;
 source.playbackRate.value = pitch;
 source.connect(audioCtx.destination);
 source.start(0);
 ,
 function(e)
 
 console.log(e);
 );
 

My only concern is if the code is filling up the memory with new functions. Like when the sample is done playing, there is still a source, request, audioData and all the functions in between floating around in memory indefinitely.

So if the garbage collection doesn't take care of it, what would be the best approach to find out when that instance of the sample is done playing and removing that specific "object" manually from memory?

javascript audiocontext

share|improve this question

edited Mar 25 at 15:01

Egon Allison

90011 gold badge55 silver badges1919 bronze badges

asked Mar 25 at 13:27

EdwardEdward

6611 silver badge1212 bronze badges

add a comment | 

0

I have created a piece of code that seems to work in playing a sound file several times simultaneously, however, I am not sure if this is the best approach.

In essence, I am trying to create a simple web piano and I may use this approach later on in a game or something. The result is pretty perfect. I can play chords with no problems, with the exception of keyboard combo limits. If I were to move var request = new XMLHttpRequest(); to outside the functions making it a call-once global variable then the sound does not play simultaneously as it does now.

document.onkeydown = function(key)

 if(pitch[key.keyCode]!==undefined)
 Voice(pitch[key.keyCode]);


function Voice(pitch)

 var source = audioCtx.createBufferSource();
 var request = new XMLHttpRequest();
 request.open("GET","sample.wav",true);
 request.responseType = "arraybuffer";
 request.send();
 request.onload = function()
 
 var audioData = request.response;
 audioCtx.decodeAudioData(audioData, function(buffer)
 
 source.buffer = buffer;
 source.playbackRate.value = pitch;
 source.connect(audioCtx.destination);
 source.start(0);
 ,
 function(e)
 
 console.log(e);
 );
 

My only concern is if the code is filling up the memory with new functions. Like when the sample is done playing, there is still a source, request, audioData and all the functions in between floating around in memory indefinitely.

So if the garbage collection doesn't take care of it, what would be the best approach to find out when that instance of the sample is done playing and removing that specific "object" manually from memory?

javascript audiocontext

share|improve this question

edited Mar 25 at 15:01

Egon Allison

90011 gold badge55 silver badges1919 bronze badges

asked Mar 25 at 13:27

EdwardEdward

6611 silver badge1212 bronze badges

add a comment | 

I have created a piece of code that seems to work in playing a sound file several times simultaneously, however, I am not sure if this is the best approach.

In essence, I am trying to create a simple web piano and I may use this approach later on in a game or something. The result is pretty perfect. I can play chords with no problems, with the exception of keyboard combo limits. If I were to move var request = new XMLHttpRequest(); to outside the functions making it a call-once global variable then the sound does not play simultaneously as it does now.

document.onkeydown = function(key)

 if(pitch[key.keyCode]!==undefined)
 Voice(pitch[key.keyCode]);


function Voice(pitch)

 var source = audioCtx.createBufferSource();
 var request = new XMLHttpRequest();
 request.open("GET","sample.wav",true);
 request.responseType = "arraybuffer";
 request.send();
 request.onload = function()
 
 var audioData = request.response;
 audioCtx.decodeAudioData(audioData, function(buffer)
 
 source.buffer = buffer;
 source.playbackRate.value = pitch;
 source.connect(audioCtx.destination);
 source.start(0);
 ,
 function(e)
 
 console.log(e);
 );
 

My only concern is if the code is filling up the memory with new functions. Like when the sample is done playing, there is still a source, request, audioData and all the functions in between floating around in memory indefinitely.

So if the garbage collection doesn't take care of it, what would be the best approach to find out when that instance of the sample is done playing and removing that specific "object" manually from memory?

javascript audiocontext

share|improve this question

edited Mar 25 at 15:01

Egon Allison

90011 gold badge55 silver badges1919 bronze badges

asked Mar 25 at 13:27

EdwardEdward

6611 silver badge1212 bronze badges

document.onkeydown = function(key)

 if(pitch[key.keyCode]!==undefined)
 Voice(pitch[key.keyCode]);


function Voice(pitch)

 var source = audioCtx.createBufferSource();
 var request = new XMLHttpRequest();
 request.open("GET","sample.wav",true);
 request.responseType = "arraybuffer";
 request.send();
 request.onload = function()
 
 var audioData = request.response;
 audioCtx.decodeAudioData(audioData, function(buffer)
 
 source.buffer = buffer;
 source.playbackRate.value = pitch;
 source.connect(audioCtx.destination);
 source.start(0);
 ,
 function(e)
 
 console.log(e);
 );
 

share|improve this question

edited Mar 25 at 15:01

Egon Allison

90011 gold badge55 silver badges1919 bronze badges

asked Mar 25 at 13:27

EdwardEdward

6611 silver badge1212 bronze badges

share|improve this question

edited Mar 25 at 15:01

Egon Allison

90011 gold badge55 silver badges1919 bronze badges

asked Mar 25 at 13:27

EdwardEdward

6611 silver badge1212 bronze badges

edited Mar 25 at 15:01

Egon Allison

90011 gold badge55 silver badges1919 bronze badges

edited Mar 25 at 15:01

Egon Allison

90011 gold badge55 silver badges1919 bronze badges

asked Mar 25 at 13:27

EdwardEdward

6611 silver badge1212 bronze badges

asked Mar 25 at 13:27

EdwardEdward

6611 silver badge1212 bronze badges