// from http://mp4ra.org/codecs.html
const sampleEntryCodesISO = {
  audio: {
    'a3ds': true,
    'ac-3': true,
    'ac-4': true,
    'alac': true,
    'alaw': true,
    'dra1': true,
    'dts+': true,
    'dts-': true,
    'dtsc': true,
    'dtse': true,
    'dtsh': true,
    'ec-3': true,
    'enca': true,
    'g719': true,
    'g726': true,
    'm4ae': true,
    'mha1': true,
    'mha2': true,
    'mhm1': true,
    'mhm2': true,
    'mlpa': true,
    'mp4a': true,
    'raw ': true,
    'Opus': true,
    'samr': true,
    'sawb': true,
    'sawp': true,
    'sevc': true,
    'sqcp': true,
    'ssmv': true,
    'twos': true,
    'ulaw': true
  },
  video: {
    'avc1': true,
    'avc2': true,
    'avc3': true,
    'avc4': true,
    'avcp': true,
    'drac': true,
    'dvav': true,
    'dvhe': true,
    'encv': true,
    'hev1': true,
    'hvc1': true,
    'mjp2': true,
    'mp4v': true,
    'mvc1': true,
    'mvc2': true,
    'mvc3': true,
    'mvc4': true,
    'resv': true,
    'rv60': true,
    's263': true,
    'svc1': true,
    'svc2': true,
    'vc-1': true,
    'vp08': true,
    'vp09': true
  }
};

export type CodecType = 'audio' | 'video';

function isCodecType (codec: string, type: CodecType): boolean {
  const typeCodes = sampleEntryCodesISO[type];
  return !!typeCodes && typeCodes[codec.slice(0, 4)] === true;
}

function isCodecSupportedInMp4 (codec: string, type: CodecType): boolean {
  return MediaSource.isTypeSupported(`${type || 'video'}/mp4;codecs="${codec}"`);
}

export { isCodecType, isCodecSupportedInMp4 };