getFileSize(time: string, rate: number = 160): number

Gets the estimated size of the MP3 file based on the audio time and bitrate.

• time: string, the duration of the MP3 file, expects either HH:MM:ss or MM:ss format

• rate: number, the bitrate of the file, defaults to 160

returns a number, the estimated MP3 file size or -1 in case of an error

getAudioDuration(size: number, rate: number): string

Gets the estimated audio duration for the provided file size and bitrate.

• size: number, file size (in KB)

• rate: number, the bitrate of the file

returns a string, the estimated audio duration formatted as HH:MM:ss or '-1' in case of an error.

getAudioBitrate(time: string, size: number): number

Gets the estimated bitrate for the provided audio duration and file size.

• time: string, the duration of the MP3 file, expects either HH:MM:ss or MM:ss format

• size: number, the size of the audio file (in KB)

returns a number, the estimated bitrate of the MP3 file or -1 in case of an error

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If you are looking for a pure JavaScript implementation of this, have a look at this.