Ajout du sampler et de l'input

src/lib/audio/processors/OctaveUp.ts

@@ -0,0 +1,48 @@
+import type { AudioProcessor } from "./AudioProcessor";
+
+export class OctaveUp implements AudioProcessor {
+  getName(): string {
+    return "Octave Up";
+  }
+
+  getDescription(): string {
+    return "Shifts pitch up one octave by doubling playback rate";
+  }
+
+  async process(
+    leftChannel: Float32Array,
+    rightChannel: Float32Array
+  ): Promise<[Float32Array, Float32Array]> {
+    const inputLength = leftChannel.length;
+    const outputLength = Math.floor(inputLength / 2);
+
+    const newLeft = new Float32Array(outputLength);
+    const newRight = new Float32Array(outputLength);
+
+    for (let i = 0; i < outputLength; i++) {
+      const sourceIndex = i * 2;
+      const lowerIndex = Math.floor(sourceIndex);
+      const upperIndex = Math.min(lowerIndex + 1, inputLength - 1);
+      const fraction = sourceIndex - lowerIndex;
+
+      newLeft[i] = leftChannel[lowerIndex] * (1 - fraction) + leftChannel[upperIndex] * fraction;
+      newRight[i] = rightChannel[lowerIndex] * (1 - fraction) + rightChannel[upperIndex] * fraction;
+    }
+
+    this.applyFadeOut(newLeft, newRight);
+
+    return [newLeft, newRight];
+  }
+
+  private applyFadeOut(left: Float32Array, right: Float32Array): void {
+    const fadeLength = Math.min(Math.floor(left.length * 0.05), 2205);
+    const fadeStart = left.length - fadeLength;
+
+    for (let i = 0; i < fadeLength; i++) {
+      const gain = 1 - (i / fadeLength);
+      const index = fadeStart + i;
+      left[index] *= gain;
+      right[index] *= gain;
+    }
+  }
+}