[lib.audio-manager] added dynamic mic volume
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@ -13,7 +13,8 @@ export default class AudioManager{
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/* (2) Create the MASTER gain */
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this.master = this.ctx.createGain();
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this.volume = this.ctx.createGain();
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this.volume.gain.setValueAtTime(.65, 0); // input volume 65%
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this.peaks = { low: 0, high: 0 };
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this.volume_value = 1;
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/* (3) Initialise input (typically bound from recorder) */
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this.input = null;
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@ -61,8 +62,8 @@ export default class AudioManager{
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/* (7) Initialise coordinator to manage received */
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this.stack = [];
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this.stack_size = 2;
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this.fade_in = 0.1;
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this.fade_out = 0.1;
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this.fade_in = 0.1;
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this.fade_out = 0.1;
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@ -225,11 +226,24 @@ export default class AudioManager{
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_audioprocess.inputBuffer.copyFromChannel(buf32, 0);
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/* (4) Convert for WS connection (Int16Array) */
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this.peaks.low = 0;
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this.peaks.high = 0;
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let buf16 = this.f32toi16(buf32);
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/* (5) Send buffer through websocket */
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this.ws.send(buf16);
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/* (5) Adapt microphone volume if had peaks */
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if( this.peaks.high > .01 ) // 30% saturation -> decrease
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this.volume_value *= .8;
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else if( this.peaks.low > .99 && this.volume_value*1.01 < 1 ) // 90% too low volume + less than 30% saturation -> increase
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this.volume_value *= 1.01;
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// apply new volume
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this.volume.gain.setValueAtTime(this.volume_value, this.ctx.currentTime);
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/* (2) WebSocket buffer stack read
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@ -339,8 +353,15 @@ export default class AudioManager{
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let i = 0, l = buf32.length;
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/* (3) Convert each value */
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for( ; i < l ; i++ )
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for( ; i < l ; i++ ){
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buf16[i] = (buf32[i] < 0) ? 0x8000 * buf32[i] : 0x7FFF * buf32[i];
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( buf32[i] > 0.9 ) && ( this.peaks.high++ );
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( buf32[i] < 0.1 ) && ( this.peaks.low++ );
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}
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/* (4) Report peaks in percentage */
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this.peaks.high /= l;
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this.peaks.low /= l;
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return buf16;
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}
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