audio-ui/lib/audio/effects/reverse.ts

/**
 * Reverse audio effect
 */

import { getAudioContext } from '../context';

/**
 * Reverse audio buffer
 * @param buffer - Source audio buffer
 * @returns New audio buffer with reversed audio
 */
export function reverseAudio(buffer: AudioBuffer): AudioBuffer {
  const audioContext = getAudioContext();
  const outputBuffer = audioContext.createBuffer(
    buffer.numberOfChannels,
    buffer.length,
    buffer.sampleRate
  );

  // Reverse each channel
  for (let channel = 0; channel < buffer.numberOfChannels; channel++) {
    const inputData = buffer.getChannelData(channel);
    const outputData = outputBuffer.getChannelData(channel);

    for (let i = 0; i < buffer.length; i++) {
      outputData[i] = inputData[buffer.length - 1 - i];
    }
  }

  return outputBuffer;
}