feat: synthesize trajectory analysis windows

packages/acoustics-core/propagation.js

@@ -23,6 +23,7 @@ export function synthesizeMicrophoneSignals(options) {
     referenceDistance = 1,
     minimumDistance = 0.01,
     maximumBufferBytes = 512 * 1024 * 1024,
+    signalOffsets,
   } = options;
   const sampleCount = Math.ceil(scene.duration * scene.sampleRate);
   const retainedBufferCount = arrayDefinition.microphones.length + scene.sources.length + 1;
@@ -46,9 +47,13 @@ export function synthesizeMicrophoneSignals(options) {
     );
   }
   const channels = arrayDefinition.microphones.map(() => new Float32Array(sampleCount));
-  const renderedSources = scene.sources.map((source) => ({
+  const sceneSampleOffset = signalOffsets?.sceneSampleOffset ?? 0;
+  const renderedSources = scene.sources.map((source, sourceIndex) => ({
     definition: source,
-    samples: renderSignal(source, scene, assetBuffers),
+    samples: renderSignal(source, scene, assetBuffers, 0, {
+      sceneSampleOffset,
+      ...(signalOffsets?.sources?.[sourceIndex] ?? {}),
+    }),
   }));
 
   renderedSources.forEach(({ definition, samples }) => {
@@ -77,7 +82,10 @@ export function synthesizeMicrophoneSignals(options) {
       channels.forEach((channel, microphoneIndex) => {
         const microphone = arrayDefinition.microphones[microphoneIndex];
         const seedSalt = Math.imul(ambientIndex + 1, 0x45d9f3b) ^ Math.imul(microphoneIndex + 1, 0x27d4eb2d);
-        const ambientSamples = renderSignal(ambient, scene, assetBuffers, seedSalt);
+        const ambientSamples = renderSignal(ambient, scene, assetBuffers, seedSalt, {
+          sceneSampleOffset,
+          ...(signalOffsets?.ambient?.[ambientIndex] ?? {}),
+        });
         const spectrum = prepareDelaySpectrum(ambientSamples, 0);
         addFrequencyDomainDelay({
           output: channel,