android-cloud-H5/static/src/helper/aac.js

/**
 *  AAC helper
 */

class AAC {
  static getSilentFrame(channelCount) {
    if (channelCount === 1) {
      return new Uint8Array([0x00, 0xc8, 0x00, 0x80, 0x23, 0x80]);
    } else if (channelCount === 2) {
      return new Uint8Array([0x21, 0x00, 0x49, 0x90, 0x02, 0x19, 0x00, 0x23, 0x80]);
    } else if (channelCount === 3) {
      return new Uint8Array([0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64, 0x00, 0x8e]);
    } else if (channelCount === 4) {
      return new Uint8Array([0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64, 0x00, 0x80, 0x2c, 0x80, 0x08, 0x02, 0x38]);
    } else if (channelCount === 5) {
      return new Uint8Array([0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64, 0x00, 0x82, 0x30, 0x04, 0x99, 0x00, 0x21, 0x90, 0x02, 0x38]);
    } else if (channelCount === 6) {
      return new Uint8Array([0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64, 0x00, 0x82, 0x30, 0x04, 0x99, 0x00, 0x21, 0x90, 0x02, 0x00, 0xb2, 0x00, 0x20, 0x08, 0xe0]);
    }
    return null;
  }
}

export default AAC;