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% Authors: Shreyas Patil, Parth Sarthi Sharma
% Affiliation: Cornell University
% Course: ECE 4760
% Purpose: Week 4 of Final Project
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clear all; %Clear all the variables in the workspace
close all; %Close all the open windows
clc; %Clear the command prompt

UPPER_RANGE = %Your Upper Range% %Upper range of the desired sample number
LOWER_RANGE = %Your Upper Range% %Lower range of the desired sample number
FILE_NAME = %Audio File Name% %Input audio file name
TEXT_FILE = %Text File Name% %Output text file name 
BitRate = 8000 %New bitrate
Range = [LOWER_RANGE, UPPER_RANGE]; %Create the Range parameter

[y, Fs] = audioread(FILE_NAME, Range); %Read the audio file
yn = resample(y, BitRate, Fs); %Resample the audio to change its bitrate
ys = yn(:, 1); %Convert dual channel audio to single channel
yqfinal = rescale(ys, 0, 4095); %Rescale the amplitude
ysfinal = cast(yqfinal, 'uint16'); %Cast each element to `uint16`

file = fopen(TEXT_FILE, 'w'); %Open the text file in write mode
for i = 1 : length(ysfinal) %For all the elements of the array
    yfinal(i) = bitor(ysfinal(i), 0b0011000000000000); %Perform the bitwise or operation to append DAC configuration bits
    fprintf(file, "%d, ", yfinal(i)); %Print the formatted output to the file
end
fclose(file); %Close the file