67 lines
1.7 KiB
JavaScript
67 lines
1.7 KiB
JavaScript
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/* Usage:
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channel.emit('audio:play',message);
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channel.emit('audio:on');
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channel.emit('audio:off');
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*/
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// Sounds module, used for emitting those annoying bl-up sounds when receiving a message
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define(['queue','mediator'], function (queue,mediator) {
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var ac = false,
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enabled = true,
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channel = mediator(),
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// Recursive function for playing tones, takes an array of [tone,start_ms,duration_ms] - entries
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// i is only used for recursion
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playTones = function (tones, i) {
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// Parameter defaults
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i = (i === undefined) ? 0 : i;
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// Stop if we've reached the end of iteration, and require ac
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if( !(i < Object.keys(tones).length) || !ac || !enabled ) return;
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// Add tones to execution queue
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var current_tones = tones[i],
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freqs = current_tones[0],
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start = current_tones[1],
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duration = current_tones[2];
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var o = ac.createOscillator();
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var g = ac.createGain();
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o.frequency.value = freqs;
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o.connect(g);
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g.gain.value = 0.25;
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g.connect(ac.destination);
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queue.add_function_delayed(start,function() { o.noteOn(0); });
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queue.add_function_delayed(start+duration,function() { o.noteOff(0); });
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// Iterate, or start playing
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i++;
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if( i < Object.keys(tones).length ) {
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playTones(tones,i);
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} else {
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queue.run();
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}
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},
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on = function() {
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enabled = true;
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},
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off = function() {
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enabled = false;
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};
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if( window.AudioContext || window.webkitAudioContext ) ac = new ( window.AudioContext || window.webkitAudioContext );
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channel.on('audio:play',function(message) { playTones(message) });
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channel.on('audio:on',function(message) { on(); });
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channel.on('audio:off',function(message) { off(); });
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});
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