A MATLAB Audio Player

audio.m

function varargout = audio(varargin)
% AUDIO MATLAB code for audio.fig
%      AUDIO, by itself, creates a new AUDIO or raises the existing
%      singleton*.
%
%      H = AUDIO returns the handle to a new AUDIO or the handle to
%      the existing singleton*.
%
%      AUDIO('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in AUDIO.M with the given input arguments.
%
%      AUDIO('Property','Value',...) creates a new AUDIO or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before audio_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to audio_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help audio

% Last Modified by GUIDE v2.5 07-Feb-2012 20:31:42

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @audio_OpeningFcn, ...
                   'gui_OutputFcn',  @audio_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before audio is made visible.
function audio_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to audio (see VARARGIN)

% Choose default command line output for audio
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes audio wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = audio_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;


% --- Executes on button press in btn_play.
function btn_play_Callback(hObject, eventdata, handles)
% hObject    handle to btn_play (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
set(handles.btn_play, 'Enable', 'off');
set(handles.btn_stop, 'Enable', 'on');
set(handles.btn_pause, 'Enable', 'on');
set(handles.btn_play1, 'Enable', 'off');


state = getappdata(handles.main_form, 'state');
if strcmp(state, 'pause')
  disp('Resuming from previous pause');
  setappdata(handles.main_form, 'state', 'play');  
  uiresume;
  return;
end

setappdata(handles.main_form, 'state', 'play');

blk_size = 2048;
fname = get(handles.edit_fname, 'String')
[x, fs] = wavread(fname);
x = mean(x, 2);

x_len = length(x);

axes(handles.main_form);
cla;

x_blk_save_1 = 0;
x_blk_save_2 = 0;
x_blk_save_3 = 0;

msound('openwrite', 0, fs, blk_size, 1);
try
  for idx = 1:blk_size:x_len
    
    state = getappdata(handles.main_form, 'state');
    if strcmp(state, 'stop')
      break;
    elseif strcmp(state, 'pause')
      uiwait;
      state = getappdata(handles.main_form, 'state');
      if strcmp(state, 'stop')
        break;
      end
    end    
    
    x_blk = x(idx:idx+blk_size-1);
    msound('putsamples', x_blk);    
    
    x_blk_save_3 = x_blk_save_2;
    x_blk_save_2 = x_blk_save_1;
    x_blk_save_1 = x_blk;
    
    plot(x_blk_save_3);
%     set(handles.main_form,...
%       'XTick', [], 'XTickMode', 'manual',...
%       'YTick', [], 'YTickMode', 'manual',...
%       'XLim', [0, blk_size-1], 'XLimMode', 'manual',...
%       'YLim', [-1, 1], 'YLimMode', 'manual'...
%       );
    ylim('manual'); ylim([-1, 1]);    
    drawnow;
        
  end
  msound('close');  
catch
  msound('close');
  rethrow(lasterror);
end

set(handles.btn_play, 'Enable', 'on');
set(handles.btn_pause, 'Enable', 'off');
set(handles.btn_stop, 'Enable', 'off');
set(handles.btn_play1, 'Enable', 'on');



% --- Executes on button press in btn_pause.
function btn_pause_Callback(hObject, eventdata, handles)
% hObject    handle to btn_pause (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

setappdata(handles.main_form, 'state', 'pause');
set(handles.btn_pause, 'Enable', 'off');
set(handles.btn_play, 'Enable', 'on');
set(handles.btn_play1, 'Enable', 'on');



% --- Executes on button press in btn_stop.
function btn_stop_Callback(hObject, eventdata, handles)
% hObject    handle to btn_stop (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% state = getappdata(handles.main_form, 'state');
setappdata(handles.main_form, 'state', 'stop');
% if strcmp(state, 'pause')
  uiresume;
% end

set(handles.btn_stop, 'Enable', 'off');
set(handles.btn_pause, 'Enable', 'off');
set(handles.btn_play, 'Enable', 'on');
set(handles.btn_play1, 'Enable', 'on');




function edit_fname_Callback(hObject, eventdata, handles)
% hObject    handle to edit_fname (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit_fname as text
%        str2double(get(hObject,'String')) returns contents of edit_fname as a double


% --- Executes during object creation, after setting all properties.
function edit_fname_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit_fname (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function use_wnd_Callback(hObject, eventdata, handles)
% hObject    handle to use_wnd (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of use_wnd as text
%        str2double(get(hObject,'String')) returns contents of use_wnd as a double


% --- Executes during object creation, after setting all properties.
function use_wnd_CreateFcn(hObject, eventdata, handles)
% hObject    handle to use_wnd (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --------------------------------------------------------------------
function Untitled_1_Callback(hObject, eventdata, handles)
% hObject    handle to Untitled_1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


% --------------------------------------------------------------------
function Untitled_2_Callback(hObject, eventdata, handles)
% hObject    handle to Untitled_2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


% --- Executes on button press in btn_play1.
function btn_play1_Callback(hObject, eventdata, handles)
% hObject    handle to btn_play1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

set(handles.btn_play, 'Enable', 'off');
set(handles.btn_play1, 'Enable', 'off');
set(handles.btn_stop, 'Enable', 'on');
set(handles.btn_pause, 'Enable', 'on');


state = getappdata(handles.main_form, 'state');
if strcmp(state, 'pause')
  disp('Resuming from previous pause');
  setappdata(handles.main_form, 'state', 'play');  
  uiresume;
  return;
end

setappdata(handles.main_form, 'state', 'play');

blk_size = 2048;
fname = get(handles.edit_fname, 'String')
[x, fs] = wavread(fname);
x = mean(x, 2);

x_len = length(x);

axes(handles.main_form);
cla;

x_blk_save_1 = 0;
x_blk_save_2 = 0;
x_blk_save_3 = 0;

msound('openwrite', 0, fs, blk_size, 1);
try
  for idx = 1:blk_size:x_len
    
    state = getappdata(handles.main_form, 'state');
    if strcmp(state, 'stop')
      break;
    elseif strcmp(state, 'pause')
      uiwait;
      state = getappdata(handles.main_form, 'state');
      if strcmp(state, 'stop')
        break;
      end
    end    
    
    x_blk = x(idx:idx+blk_size-1);
    
    msound('putsamples', x_blk);   
    
    x_blk_save_3 = x_blk_save_2;
    x_blk_save_2 = x_blk_save_1;
    x_blk_save_1 = freqz(x_blk);
    
    bar(x_blk_save_3,0.7);
%     plot(x_blk_save_3);
%     set(handles.main_form,...
%       'XTick', [], 'XTickMode', 'manual',...
%       'YTick', [], 'YTickMode', 'manual',...
%       'XLim', [0, blk_size-1], 'XLimMode', 'manual',...
%       'YLim', [-1, 1], 'YLimMode', 'manual'...
%       );
    ylim('manual'); ylim([0, 40]);   
    xlim('manual'); xlim([0, 14]);
    drawnow;
        
  end
  msound('close');  
catch
  msound('close');
  rethrow(lasterror);
end

set(handles.btn_play, 'Enable', 'on');
set(handles.btn_pause, 'Enable', 'off');
set(handles.btn_stop, 'Enable', 'off');