Hello, I'm currently working to make a 10-band equalizer. I am using appdesigner. Currently I get the mp3 song using uigetfile then use the audioread function. After which I filter the song and then use audioplayer to play the song. What I would like to do is play the song and filter while the song keeps playing. I don't know if this is possible with MATLAB. I have sliders for the gain of each band and one for volume. I would like to adust the gain of any band and then filter the song but continue playing. Currently I have to stop the song re filter and press play and start the music from the beggining. Is what I'm asking possible and if so could I be pointed in the right direction? My code so far is below as well as a picture of what the app currently looks like.
classdef musicPlayer < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
SongEditFieldLabel matlab.ui.control.Label
SongEditField matlab.ui.control.EditField
BrowseButton matlab.ui.control.Button
PlayButton matlab.ui.control.Button
PauseButton matlab.ui.control.Button
StopButton matlab.ui.control.Button
VolumeKnobLabel matlab.ui.control.Label
VolumeKnob matlab.ui.control.Knob
HzSlider_3Label matlab.ui.control.Label
HzSlider_3 matlab.ui.control.Slider
HzSlider_4Label matlab.ui.control.Label
HzSlider_4 matlab.ui.control.Slider
HzSlider_5Label matlab.ui.control.Label
HzSlider_5 matlab.ui.control.Slider
kHzSliderLabel matlab.ui.control.Label
kHzSlider matlab.ui.control.Slider
kHzSlider_2Label matlab.ui.control.Label
kHzSlider_2 matlab.ui.control.Slider
kHzSlider_3Label matlab.ui.control.Label
kHzSlider_3 matlab.ui.control.Slider
kHzSlider_4Label matlab.ui.control.Label
kHzSlider_4 matlab.ui.control.Slider
kHzSlider_5Label matlab.ui.control.Label
kHzSlider_5 matlab.ui.control.Slider
HipHopButton matlab.ui.control.Button
LatinButton matlab.ui.control.Button
RockButton matlab.ui.control.Button
RBButton matlab.ui.control.Button
HzSlider_6Label matlab.ui.control.Label
HzSlider_1 matlab.ui.control.Slider
HzSlider_7Label matlab.ui.control.Label
HzSlider_2 matlab.ui.control.Slider
end
properties (Access = private)
song;
path;
y;
Fs;
Fn;
audio;
yFiltered32;
yFiltered64;
yFiltered130;
yFiltered270;
yFiltered560;
yFiltered1k;
yFiltered2k;
yFiltered4k;
yFiltered8k;
yFiltered16k;
yFiltered;
yFilteredWithVolume;
paused = 0;
end
methods (Access = private)
function yFilt = lowpassFirFilt(app, order, Fcutoff)
a = 1;
b = fir1(order, Fcutoff/app.Fn, 'low');
yFilt = filter(b, a, app.y);
end
function yFilt = bandpassFirFilt(app, order, Fcutoff, Fstopband)
a = 1;
b = fir1(order, [Fcutoff/app.Fn Fstopband/app.Fn], 'bandpass');
yFilt = filter(b, a, app.y);
end
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: BrowseButton
function BrowseButtonPushed(app, event)
[app.song, app.path] = uigetfile({'*.mp3'}, 'File Selector');
app.SongEditField.Value = app.song;
[app.y, app.Fs] = audioread(app.song);
app.Fn = app.Fs/2;
end
% Button pushed function: PlayButton
function PlayButtonPushed(app, event)
if app.paused == 1
resume(app.audio);
app.paused = 0;
elseif app.paused == 0
app.yFiltered32 = app.HzSlider_1.Value*app.lowpassFirFilt(4, 32);
app.yFiltered64 = app.HzSlider_2.Value*app.bandpassFirFilt(4, 33, 64);
app.yFiltered130 = app.HzSlider_3.Value*app.bandpassFirFilt(4, 65, 130);
app.yFiltered270 = app.HzSlider_4.Value*app.bandpassFirFilt(4, 131, 270);
app.yFiltered560 = app.HzSlider_5.Value*app.bandpassFirFilt(4, 271, 560);
app.yFiltered1k = app.kHzSlider.Value*app.bandpassFirFilt(4, 561, 1000);
app.yFiltered2k = app.kHzSlider_2.Value*app.bandpassFirFilt(4, 1001, 2000);
app.yFiltered4k = app.kHzSlider_3.Value*app.bandpassFirFilt(4, 2001, 4000);
app.yFiltered8k = app.kHzSlider_4.Value*app.bandpassFirFilt(4, 4001, 8000);
app.yFiltered16k = app.kHzSlider_5.Value*app.bandpassFirFilt(4, 8001, 16000);
app.yFiltered = app.yFiltered32 + app.yFiltered64 + app.yFiltered130 + app.yFiltered270 + app.yFiltered560 + ...
app.yFiltered1k + app.yFiltered2k + app.yFiltered4k + app.yFiltered8k + app.yFiltered16k;
app.yFilteredWithVolume = app.yFiltered*(app.VolumeKnob.Value/10);
app.audio = audioplayer(app.yFilteredWithVolume, app.Fs);
play(app.audio);
end
end
% Button pushed function: PauseButton
function PauseButtonPushed(app, event)
pause(app.audio);
app.paused = 1;
end
% Button pushed function: StopButton
function StopButtonPushed(app, event)
stop(app.audio);
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure('Visible', 'off');
app.UIFigure.Position = [100 100 1036 761];
app.UIFigure.Name = 'MATLAB App';
% Create SongEditFieldLabel
app.SongEditFieldLabel = uilabel(app.UIFigure);
app.SongEditFieldLabel.HorizontalAlignment = 'right';
app.SongEditFieldLabel.Position = [36 722 34 22];
app.SongEditFieldLabel.Text = 'Song';
% Create SongEditField
app.SongEditField = uieditfield(app.UIFigure, 'text');
app.SongEditField.Position = [85 722 480 22];
% Create BrowseButton
app.BrowseButton = uibutton(app.UIFigure, 'push');
app.BrowseButton.ButtonPushedFcn = createCallbackFcn(app, @BrowseButtonPushed, true);
app.BrowseButton.Position = [587 722 100 22];
app.BrowseButton.Text = 'Browse';
% Create PlayButton
app.PlayButton = uibutton(app.UIFigure, 'push');
app.PlayButton.ButtonPushedFcn = createCallbackFcn(app, @PlayButtonPushed, true);
app.PlayButton.Position = [19 667 100 22];
app.PlayButton.Text = 'Play';
% Create PauseButton
app.PauseButton = uibutton(app.UIFigure, 'push');
app.PauseButton.ButtonPushedFcn = createCallbackFcn(app, @PauseButtonPushed, true);
app.PauseButton.Position = [136 667 100 22];
app.PauseButton.Text = 'Pause';
% Create StopButton
app.StopButton = uibutton(app.UIFigure, 'push');
app.StopButton.ButtonPushedFcn = createCallbackFcn(app, @StopButtonPushed, true);
app.StopButton.Position = [251 667 100 22];
app.StopButton.Text = 'Stop';
% Create VolumeKnobLabel
app.VolumeKnobLabel = uilabel(app.UIFigure);
app.VolumeKnobLabel.HorizontalAlignment = 'center';
app.VolumeKnobLabel.Position = [801 607 46 22];
app.VolumeKnobLabel.Text = 'Volume';
% Create VolumeKnob
app.VolumeKnob = uiknob(app.UIFigure, 'continuous');
app.VolumeKnob.Position = [793 663 60 60];
% Create HzSlider_3Label
app.HzSlider_3Label = uilabel(app.UIFigure);
app.HzSlider_3Label.HorizontalAlignment = 'right';
app.HzSlider_3Label.Position = [256 342 44 22];
app.HzSlider_3Label.Text = '130 Hz';
% Create HzSlider_3
app.HzSlider_3 = uislider(app.UIFigure);
app.HzSlider_3.Limits = [-10 10];
app.HzSlider_3.Orientation = 'vertical';
app.HzSlider_3.Position = [256 372 3 150];
app.HzSlider_3.Value = 1;
% Create HzSlider_4Label
app.HzSlider_4Label = uilabel(app.UIFigure);
app.HzSlider_4Label.HorizontalAlignment = 'right';
app.HzSlider_4Label.Position = [366 341 44 22];
app.HzSlider_4Label.Text = '270 Hz';
% Create HzSlider_4
app.HzSlider_4 = uislider(app.UIFigure);
app.HzSlider_4.Limits = [-10 10];
app.HzSlider_4.Orientation = 'vertical';
app.HzSlider_4.Position = [370 371 3 150];
app.HzSlider_4.Value = 1;
% Create HzSlider_5Label
app.HzSlider_5Label = uilabel(app.UIFigure);
app.HzSlider_5Label.HorizontalAlignment = 'right';
app.HzSlider_5Label.Position = [477 344 44 22];
app.HzSlider_5Label.Text = '560 Hz';
% Create HzSlider_5
app.HzSlider_5 = uislider(app.UIFigure);
app.HzSlider_5.Limits = [-10 10];
app.HzSlider_5.Orientation = 'vertical';
app.HzSlider_5.Position = [481 372 3 150];
app.HzSlider_5.Value = 1;
% Create kHzSliderLabel
app.kHzSliderLabel = uilabel(app.UIFigure);
app.kHzSliderLabel.HorizontalAlignment = 'right';
app.kHzSliderLabel.Position = [580 347 36 22];
app.kHzSliderLabel.Text = '1 kHz';
% Create kHzSlider
app.kHzSlider = uislider(app.UIFigure);
app.kHzSlider.Limits = [-10 10];
app.kHzSlider.Orientation = 'vertical';
app.kHzSlider.Position = [580 374 3 150];
app.kHzSlider.Value = 1;
% Create kHzSlider_2Label
app.kHzSlider_2Label = uilabel(app.UIFigure);
app.kHzSlider_2Label.HorizontalAlignment = 'right';
app.kHzSlider_2Label.Position = [679 348 36 22];
app.kHzSlider_2Label.Text = '2 kHz';
% Create kHzSlider_2
app.kHzSlider_2 = uislider(app.UIFigure);
app.kHzSlider_2.Limits = [-10 10];
app.kHzSlider_2.Orientation = 'vertical';
app.kHzSlider_2.Position = [679 378 3 150];
app.kHzSlider_2.Value = 1;
% Create kHzSlider_3Label
app.kHzSlider_3Label = uilabel(app.UIFigure);
app.kHzSlider_3Label.HorizontalAlignment = 'right';
app.kHzSlider_3Label.Position = [768 353 36 22];
app.kHzSlider_3Label.Text = '4 kHz';
% Create kHzSlider_3
app.kHzSlider_3 = uislider(app.UIFigure);
app.kHzSlider_3.Limits = [-10 10];
app.kHzSlider_3.Orientation = 'vertical';
app.kHzSlider_3.Position = [775 377 3 150];
app.kHzSlider_3.Value = 1;
% Create kHzSlider_4Label
app.kHzSlider_4Label = uilabel(app.UIFigure);
app.kHzSlider_4Label.HorizontalAlignment = 'right';
app.kHzSlider_4Label.Position = [878 350 36 22];
app.kHzSlider_4Label.Text = '8 kHz';
% Create kHzSlider_4
app.kHzSlider_4 = uislider(app.UIFigure);
app.kHzSlider_4.Limits = [-10 10];
app.kHzSlider_4.Orientation = 'vertical';
app.kHzSlider_4.Position = [881 375 3 150];
app.kHzSlider_4.Value = 1;
% Create kHzSlider_5Label
app.kHzSlider_5Label = uilabel(app.UIFigure);
app.kHzSlider_5Label.HorizontalAlignment = 'right';
app.kHzSlider_5Label.Position = [977 353 43 22];
app.kHzSlider_5Label.Text = '16 kHz';
% Create kHzSlider_5
app.kHzSlider_5 = uislider(app.UIFigure);
app.kHzSlider_5.Limits = [-10 10];
app.kHzSlider_5.Orientation = 'vertical';
app.kHzSlider_5.Position = [980 378 3 150];
app.kHzSlider_5.Value = 1;
% Create HipHopButton
app.HipHopButton = uibutton(app.UIFigure, 'push');
app.HipHopButton.Position = [180 220 100 22];
app.HipHopButton.Text = 'Hip Hop';
% Create LatinButton
app.LatinButton = uibutton(app.UIFigure, 'push');
app.LatinButton.Position = [385 220 100 22];
app.LatinButton.Text = 'Latin';
% Create RockButton
app.RockButton = uibutton(app.UIFigure, 'push');
app.RockButton.Position = [793 220 100 22];
app.RockButton.Text = 'Rock';
% Create RBButton
app.RBButton = uibutton(app.UIFigure, 'push');
app.RBButton.Position = [587 220 100 22];
app.RBButton.Text = 'R & B';
% Create HzSlider_6Label
app.HzSlider_6Label = uilabel(app.UIFigure);
app.HzSlider_6Label.HorizontalAlignment = 'right';
app.HzSlider_6Label.Position = [45 342 37 22];
app.HzSlider_6Label.Text = '32 Hz';
% Create HzSlider_1
app.HzSlider_1 = uislider(app.UIFigure);
app.HzSlider_1.Limits = [-10 10];
app.HzSlider_1.Orientation = 'vertical';
app.HzSlider_1.Position = [52 374 3 150];
app.HzSlider_1.Value = 1;
% Create HzSlider_7Label
app.HzSlider_7Label = uilabel(app.UIFigure);
app.HzSlider_7Label.HorizontalAlignment = 'right';
app.HzSlider_7Label.Position = [147 340 37 22];
app.HzSlider_7Label.Text = '64 Hz';
% Create HzSlider_2
app.HzSlider_2 = uislider(app.UIFigure);
app.HzSlider_2.Limits = [-10 10];
app.HzSlider_2.Orientation = 'vertical';
app.HzSlider_2.Position = [152 370 3 150];
app.HzSlider_2.Value = 1;
% Show the figure after all components are created
app.UIFigure.Visible = 'on';
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = musicPlayer
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end
Prashant Kumar answered . 2024-04-27 08:27:44
Lazaro - I don't think that changing the audio player samples is permitted (at least I can't see any functions to get or set the samples) so you would need to stop the player and create a new one...though you may be able to play from where the last one left off. If you pause the player and then get it's CurrentSample property you may be able to use it when starting the next player. For example, to get that sample you could do
load handel.mat; handelObj = audioplayer(y, Fs); play(handelObj); pause(1); pause(handelObj); atCurrentSample = get(handelObj, 'CurrentSample')
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