react-native-audio-api/lib/module/core/AudioBuffer.js

react-native-audio-api provides system for controlling audio in React Native environment compatible with Web Audio API specification

"use strict";

import { IndexSizeError } from "../errors/index.js";
export default class AudioBuffer {
  /** @internal */

  constructor(buffer) {
    this.buffer = buffer;
    this.length = buffer.length;
    this.duration = buffer.duration;
    this.sampleRate = buffer.sampleRate;
    this.numberOfChannels = buffer.numberOfChannels;
  }
  getChannelData(channel) {
    if (channel < 0 || channel >= this.numberOfChannels) {
      throw new IndexSizeError(`The channel number provided (${channel}) is outside the range [0, ${this.numberOfChannels - 1}]`);
    }
    return this.buffer.getChannelData(channel);
  }
  copyFromChannel(destination, channelNumber, startInChannel = 0) {
    if (channelNumber < 0 || channelNumber >= this.numberOfChannels) {
      throw new IndexSizeError(`The channel number provided (${channelNumber}) is outside the range [0, ${this.numberOfChannels - 1}]`);
    }
    if (startInChannel < 0 || startInChannel >= this.length) {
      throw new IndexSizeError(`The startInChannel number provided (${startInChannel}) is outside the range [0, ${this.length - 1}]`);
    }
    this.buffer.copyFromChannel(destination, channelNumber, startInChannel);
  }
  copyToChannel(source, channelNumber, startInChannel = 0) {
    if (channelNumber < 0 || channelNumber >= this.numberOfChannels) {
      throw new IndexSizeError(`The channel number provided (${channelNumber}) is outside the range [0, ${this.numberOfChannels - 1}]`);
    }
    if (startInChannel < 0 || startInChannel >= this.length) {
      throw new IndexSizeError(`The startInChannel number provided (${startInChannel}) is outside the range [0, ${this.length - 1}]`);
    }
    this.buffer.copyToChannel(source, channelNumber, startInChannel);
  }
}
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