authMultimediaAssignment2018/Level_3/demoAAC3.m

function [SNR, bitrate, compression] = demoAAC3(fNameIn, fNameOut, frameAACoded)
%Function that demonstrates usage of the level 3 code
%   Usage [SNR, bitrate, compression] = demoAAC3(fNameIn, fNameOut, frameAACoded), where:
%       Inputs
%       - fNameIn is the filename and path of the file to encode
%       - fNameOut is the filename and path of the wav file that will be
%       written after decoding
%       - frameAACoded is the filename and path of the mat file that will
%       be written after encoding
%
%       Output
%       - SNR is the signal to noise ration computed after successively
%       encoding and decoding the audio signal
%       - bitrate is the bits per second
%       - compression is the ratio of the bitrate before the encoding to
%       the bitrate after it

    AACSeq3 = AACoder3(fNameIn, frameAACoded);
    decodedAudio = iAACoder3(AACSeq3, fNameOut);

    [audioData, ~] = audioread(fNameIn);
    
    snr(audioData(1025:length(decodedAudio)-1024, 1), audioData(1025:length(decodedAudio)-1024, 1) - decodedAudio(1025:end-1024, 1))
    snr(audioData(1025:length(decodedAudio)-1024, 2), audioData(1025:length(decodedAudio)-1024, 2) - decodedAudio(1025:end-1024, 2))
    SNR = snr(audioData(1025:length(decodedAudio)-1024, :), audioData(1025:length(decodedAudio)-1024, 2) - decodedAudio(1025:end-1024, :));
end