working

packages/superdough/superdoughoutput.mjs

@@ -0,0 +1,192 @@
+import { effectSend, webAudioTimeout } from './helpers.mjs';
+import { errorLogger } from './logger.mjs';
+
+let hasChanged = (now, before) => now !== undefined && now !== before;
+
+export class Orbit {
+  reverbNode;
+  delayNode;
+  output;
+  summingNode;
+  audioContext;
+  constructor(audioContext) {
+    this.audioContext = audioContext;
+    this.output = new GainNode(audioContext, { gain: 1, channelCount: 2, channelCountMode: 'explicit' });
+    this.summingNode = new GainNode(audioContext, { gain: 1, channelCount: 2, channelCountMode: 'explicit' });
+    this.summingNode.connect(this.output);
+  }
+
+  disconnect() {
+    this.output.disconnect();
+    this.summingNode.disconnect();
+    this.delayNode?.disconnect();
+    this.reverbNode?.disconnect();
+  }
+
+  getDelay(delaytime = 0, feedback = 0.5, t) {
+    const maxfeedback = 0.98;
+    if (feedback > maxfeedback) {
+      //logger(`feedback was clamped to ${maxfeedback} to save your ears`);
+    }
+    feedback = clamp(feedback, 0, 0.98);
+    if (this.delayNode == null) {
+      this.delayNode = this.audioContext.createFeedbackDelay(1, delaytime, feedback);
+      this.delayNode.connect(this.summingNode);
+      this.delayNode.start?.(t); // for some reason, this throws when audion extension is installed..
+    }
+    this.delayNode.delayTime.value !== delaytime && this.delayNode.delayTime.setValueAtTime(delaytime, t);
+    this.delayNode.feedback.value !== feedback && this.delayNode.feedback.setValueAtTime(feedback, t);
+    return this.delayNode;
+  }
+
+  getReverb(duration, fade, lp, dim, ir, irspeed, irbegin) {
+    // If no reverb has been created for a given orbit, create one
+    if (this.reverbNode == null) {
+      this.reverbNode = this.audioContext.createReverb(duration, fade, lp, dim, ir, irspeed, irbegin);
+      this.reverbNode.connect(this.summingNode);
+    }
+
+    if (
+      hasChanged(duration, this.reverbNode.duration) ||
+      hasChanged(fade, this.reverbNode.fade) ||
+      hasChanged(lp, this.reverbNode.lp) ||
+      hasChanged(dim, this.reverbNode.dim) ||
+      hasChanged(irspeed, this.reverbNode.irspeed) ||
+      hasChanged(irbegin, this.reverbNode.irbegin) ||
+      this.reverbNode.ir !== ir
+    ) {
+      // only regenerate when something has changed
+      // avoids endless regeneration on things like
+      // stack(s("a"), s("b").rsize(8)).room(.5)
+      // this only works when args may stay undefined until here
+      // setting default values breaks this
+      this.reverbNode.generate(duration, fade, lp, dim, ir, irspeed, irbegin);
+    }
+    return this.reverbNode;
+  }
+  sendReverb(node, amount) {
+    effectSend(node, this.reverbNode, amount);
+  }
+
+  sendDelay(node, amount) {
+    effectSend(node, this.delayNode, amount);
+  }
+
+  duck(t, onsettime = 0, attacktime = 0.1, depth = 1) {
+    const onset = onsettime;
+    const attack = Math.max(attacktime, 0.002);
+    const gainParam = this.output.gain;
+    webAudioTimeout(
+      this.audioContext,
+      () => {
+        const now = this.audioContext.currentTime;
+
+        // cancelScheduledValues and setValueAtTime together emulate cancelAndHoldAtTime
+        // on browsers which lack that method
+        const currVal = gainParam.value;
+        gainParam.cancelScheduledValues(now);
+        gainParam.setValueAtTime(currVal, now);
+
+        const t0 = Math.max(t, now); // guard against now > t
+        const duckedVal = clamp(1 - Math.sqrt(depth), 0.01, currVal);
+        gainParam.exponentialRampToValueAtTime(duckedVal, t0 + onset);
+        gainParam.exponentialRampToValueAtTime(1, t0 + onset + attack);
+      },
+      0,
+      t - 0.01,
+    );
+  }
+
+  connectToOutput(node) {
+    node.connect(this.summingNode);
+  }
+}
+
+export class SuperdoughOutput {
+  channelMerger;
+  destinationGain;
+
+  constructor(audioContext) {
+    this.audioContext = audioContext;
+    this.initializeAudio();
+  }
+
+  initializeAudio() {
+    const audioContext = this.audioContext;
+    const maxChannelCount = audioContext.destination.maxChannelCount;
+    this.audioContext.destination.channelCount = maxChannelCount;
+    this.channelMerger = new ChannelMergerNode(audioContext, { numberOfInputs: audioContext.destination.channelCount });
+    this.destinationGain = new GainNode(audioContext);
+    this.channelMerger.connect(this.destinationGain);
+    this.destinationGain.connect(audioContext.destination);
+  }
+
+  reset() {
+    this.channelMerger.disconnect();
+    this.destinationGain.disconnect();
+    this.destinationGain = null;
+    this.channelMerger = null;
+    this.nodes = {};
+    this.initializeAudio();
+  }
+  connectToDestination = (input, channels = [0, 1]) => {
+    //This upmix can be removed if correct channel counts are set throughout the app,
+    // and then strudel could theoretically support surround sound audio files
+    const stereoMix = new StereoPannerNode(this.audioContext);
+    input.connect(stereoMix);
+
+    const splitter = new ChannelSplitterNode(this.audioContext, {
+      numberOfOutputs: stereoMix.channelCount,
+    });
+    stereoMix.connect(splitter);
+    channels.forEach((ch, i) => {
+      splitter.connect(this.channelMerger, i % stereoMix.channelCount, ch % this.audioContext.destination.channelCount);
+    });
+  };
+}
+
+export class SuperdoughAudioController {
+  audioContext;
+  output;
+  nodes = {};
+
+  constructor(audioContext) {
+    this.audioContext = audioContext;
+    this.output = new SuperdoughOutput(audioContext);
+  }
+
+  reset() {
+    Array.from(this.nodes).forEach((node) => {
+      node.disconnect();
+    });
+    this.output.reset();
+  }
+
+  duck(targetOrbits, t, onsettime = 0, attacktime = 0.1, depth = 1) {
+    const targetArr = [targetOrbits].flat();
+    const onsetArr = [onsettime].flat();
+    const attackArr = [attacktime].flat();
+    const depthArr = [depth].flat();
+
+    targetArr.forEach((target, idx) => {
+      const orbit = this.nodes[target];
+
+      if (orbit == null) {
+        errorLogger(new Error(`duck target orbit ${target} does not exist`), 'superdough');
+        return;
+      }
+      const onset = onsetArr[idx] ?? onsetArr[0];
+      const attack = Math.max(attackArr[idx] ?? attackArr[0], 0.002);
+      const depth = depthArr[idx] ?? depthArr[0];
+      orbit.duck({ t, onsettime: onset, attacktime: attack, depth });
+    });
+  }
+
+  getOrbit(orbitNum, channels) {
+    if (this.nodes[orbitNum] == null) {
+      this.nodes[orbitNum] = new Orbit(this.audioContext);
+      this.output.connectToDestination(this.nodes[orbitNum].output, channels);
+    }
+    return this.nodes[orbitNum];
+  }
+}