You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: audioload.m
    path of file: ./repos/audio-steganography-algorithms/01-Spread-Spectrum/02-Improved-Spread-Spectrum
    
    the code of the file until where you have to start completion: function file = audioload()
%AUDIOLOAD() is a combination of several audioreaders.
%   It supports .WAV .FLAC .MP3 .M4A .AAC .OGG .OGA types. Important
%   information such as data part, samplerate, bitrate, quality is stored
%   in a structure to be used later on. File structure will be necessary
%   for audiosave() function.
%
%   Kadir Tekeli (kadir.tekeli@outlook.com)

message = 'Select audio file.';
type1 = '*.wav; *.flac;'; type2 = '*.mp3;'
    
function [Y,FS,RATE,NBITS,OPTS] = mp3read(FILE,N,MONO,DOWNSAMP,DELAY)
% MP3READ   Read MP3 audio file via use of external binaries.
%   Y = MP3READ(FILE) reads an mp3-encoded audio file into the
%     vector Y just like wavread reads a wav-encoded file (one channel 
%     per column).  Extension ".mp3" is added if FILE has none.
%     Also accepts other formats of wavread, such as
%   Y = MP3READ(FILE,N) to read just the first N sample frames (N
%     scalar), or the frames from N(1) to N(2) if N is a two-element vector.  
%   Y = MP3READ(FILE,FMT) or Y = mp3read(FILE,N,FMT) 
%     with FMT as 'native' returns int16 samples instead of doubles; 
%     FMT can be 'double' for default behavior (to exactly mirror the
%     syntax of wavread).
%
%   [Y,FS,NBITS,OPTS] = MP3READ(FILE...) returns extra information:
%     FS is the sampling rate,  NBITS is the bit depth (always 16), 
%     OPTS.fmt is a format info string; OPTS has multiple other
%     fields, see WAVREAD.
%
%   SIZ = MP3READ(FILE,'size') returns the size of the audio data contained
%     in the file in place of the actual audio data, returning the
%     2-element vector SIZ=[samples channels].
%
%   [Y...] = MP3READ(FILE,N,MONO,DOWNSAMP,DELAY) extend