function encode_decode(codec)
% ENCODE_DECODE(Coder)
%  Coder=1 AMR wideband coder at 4.75kbps
%  Coder=2 AMR wideband coder at 12.2kbps
%  Coder=3 G722 coder at 6.6kbps
%  Coder=4 G722 coder at 23.85kbps
%  Coder=5 G729 coder at 6.4kbps
%  Coder=6 G729 coder at 11.8kbps

if (nargin < 1)
    help encode_decode;
    error('Too few input arguments');
end

if codec>6
    help encode_decode;
    error('The entered value is too big');
end

codecs=[
    'amr_4750  ';
    'amr_12200 ';
    'g722_6600 ';
    'g722_23850';
    'g729_6400 ';
    'g729_11800';
];

Path='./samples/';
s=input('Enter the filename :','s');
InputFile=[Path,s];

[fid, message] = fopen(InputFile);
if ~isempty(message)
	error(message)
end
fclose(fid);

BitFile=['./BitStream'];
OutFile=strtrim([InputFile,'.',codecs(codec,:)]);

%  coding using the chosen codec
switch codec
    case 1
        % encoding stage
        disp('AMR wideband codec at 4.7kbps');
        execline=sprintf('!wine amr_encoder MR475 %s %s',InputFile,BitFile);
        eval(execline);
        % decoding stage
        execline=sprintf('!wine ./amr_decoder %s %s',BitFile,OutFile);
        eval(execline);
        x=speechin(InputFile);
        y=speechin(OutFile);
        disp('The original signals ix in vector x');
        disp('The decoded signal in vector y');
        disp('Enter ">> dbcont" to exit the debug mode');
        keyboard
    case 2
        % encoding stage
        disp('AMR wideband codec at 12.2kbps');
        execline=sprintf('!wine amr_encoder MR122 %s %s',InputFile,BitFile);
        eval(execline);
        % decoding stage
        execline=sprintf('!wine amr_decoder %s %s',BitFile,OutFile);
        eval(execline);
        x=speechin(InputFile);
        y=speechin(OutFile);
        disp('The original signals ix in vector x');
        disp('The decoded signal in vector y');
        disp('Enter ">> dbcont" to exit the debug mode');
        keyboard
        
    case 3
        % encoding stage
        disp('G722 codec at 6.60kbps');
        execline=sprintf('!wine g722_encoder 0 %s %s',InputFile,BitFile);
        eval(execline);
        % decoding stage
        execline=sprintf('!wine g722_decoder %s %s',BitFile,OutFile);
        eval(execline);
        x=speechin(InputFile);
        y=speechin(OutFile);
        disp('The original signals ix in vector x');
        disp('The decoded signal in vector y');
        disp('Enter ">> dbcont" to exit the debug mode');
        keyboard
    case 4
        % encoding stage
        disp('G722 codec at 23.85kbps');
        execline=sprintf('!g722_encoder 8 %s %s',InputFile,BitFile);
        eval(execline);
        % decoding stage
        execline=sprintf('!g722_decoder %s %s',BitFile,OutFile);
        eval(execline);
        x=speechin(InputFile);
        y=speechin(OutFile);
        disp('The original signals ix in vector x');
        disp('The decoded signal in vector y');
        disp('Enter ">> dbcont" to exit the debug mode');
        keyboard

    case 5
        % encoding stage
        disp('G729 codec at 6.4kbps');
        execline=sprintf('!g729_encoder  %s %s 0',InputFile,BitFile);
        eval(execline);
        % decoding stage
        execline=sprintf('!g729_decoder %s %s',BitFile,OutFile);
        eval(execline);
        x=speechin(InputFile);
        y=speechin(OutFile);
        disp('The original signals ix in vector x');
        disp('The decoded signal in vector y');
        disp('Enter ">> dbcont" to exit the debug mode');
        keyboard
    case 6
        % encoding stage
        disp('G729 codec at 11.8kbps');
        execline=sprintf('!g729_encoder %s %s 2',InputFile,BitFile);
        eval(execline);
        % decoding stage
        execline=sprintf('!g729_decoder %s %s',BitFile,OutFile);
        eval(execline);
        x=speechin(InputFile);
        y=speechin(OutFile);
        disp('The original signals ix in vector x');
        disp('The decoded signal in vector y');
        disp('Enter ">> dbcont" to exit the debug mode');
        keyboard        
end