Web Audio Issues

Monkey Forums/Monkey Bug Reports/Web Audio Issues

Timotron

(Posted 2014) [#1]

I have run into two issues after switching the project over to using Web Audio for our HTML5 target.

First:
Trying to load a sound and then playing it immediately does not play anything, I worked around this by preloading all sounds asynchronously before they are needed.

IE: doing this fails to play a sound

Local sound := LoadSound("sample_sound.m4a")
PlaySound(sound)

Second:
Our audio developer reported that the audio was now muffled and not playing clearly. On searching for this issue I found that changing the panner model to "equalpower" fixed the issue, and our audio dev verifies that it is fixed.

In the file "mojo.html5.js" I modified the following code

// ***** WebAudio gxtkChannel *****

var gxtkChannel=function(){
	this.buffer=null;
	this.flags=0;
	this.volume=1;
	this.pan=0;
	this.rate=1;
	this.waSource=null;
	this.waPan=wa.create
	this.waGain=wa.createGain();
	this.waGain.connect( wa.destination );
	this.waPanner=wa.createPanner();
	this.waPanner.rolloffFactor=0;
	this.waPanner.panningModel = "equalpower"; //<---- The default "HRTF" can cause muffled sounds changed to equalpower
	this.waPanner.connect( this.waGain );
	this.startTime=0;
	this.offset=0;
	this.state=0;
}

Note: There does seem some issues with how the panner in web audio works. https://github.com/WebAudio/web-audio-api/issues/372

marksibly

(Posted 2014) [#2]

> Trying to load a sound and then playing it immediately does not play anything,

Not sure there's anything I can do about this - you just can't 'wait' for anything in html5. But I'll look into it.

> On searching for this issue I found that changing the panner model to "equalpower" fixed the issue, and our audio dev verifies that it is fixed.

Nice! Will add.

Carlo

(Posted 2014) [#3]

audio code not work for ipad /iphone the sound is mute
i tested width wav ogg mp3 m4a all sound don't work ( html5 )
i compiled on iOS and work

Carlo

skid	(Posted 2014) [#4]

This is not monkey's fault, audio startup must be instigated by user interaction event not app on iOS browser.

Carlo

(Posted 2014) [#5]

i use a audiotext.monkey ( example bananas ) i compiling with html5 targhet upload a web server but not work into ipad iphone

skid	(Posted 2014) [#6]

I'm not sure if any bananas are compliant with the following, typi-cripple Apple...

Note: On iOS, the Web Audio API requires sounds to be triggered from an explicit user action, such as a tap. Calling noteOn() from an onload event will not play sound.

https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/Using_HTML5_Audio_Video/PlayingandSynthesizingSounds/PlayingandSynthesizingSounds.html