Change from wavplay to audioplayer

function play_Callback(hObject, eventdata, handles)
% hObject    handle to play (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global stop file_name C;
stop=1;
equalizer_play();
function equalizer_play()
global stop file_name C;
[x,Fs]= audioread(file_name);
[a,b]=coef();
l_bucata=2*Fs;
Nb=round(length(x)/l_bucata);
y=0;
for i=1:floor(Nb)
    bucata=x((i-1)*l_bucata+1:i*l_bucata);
    for k=1:5
        y=y+filter(10^(C(k)/20)*b{k},a{k},bucata);
        if(stop==0)
            break;
        end     
    end
    wavplay(y,Fs,'async');
    y=0;
    if(stop==0)
        break;
    end   
end

i want to change this code to fit audioplayer() ?

Answer 1

[Walter Roberson]

p = audioplayer(y, Fs);
playblocking(p);

Note that using playblocking() is not exactly the same as what you have now. Your current code loops back around and starts playing the new y for the next i while the first wavplay is still playing, and leaves up to floor(Nb) sounds playing simultaneously when the function returns. It is possible to emulate that behaviour, but is it really what you want?

[Hassan Bosha]

how will that affect playing of the sound file ?

[Walter Roberson]

Ah, I did not read through the definition of 'async' for the old wavplay(): it did not permit two players to play at the same time.

The difference between what I wrote with playblocking() compared to wavplay() with the 'async' call, is that with the code you have now, if you ran it on a system old enough to have wavplay, then when the last iteration of for i was being executed, the old code would return out of equalizer_play(), and therefore out of the play_Callback function, giving the user back control of the user interface while that very last iteration was being played, but not before that last for i iteration. With playblocking() that I suggest, then instead the control being returned to the user while that last sound is playing, control would not return to the user until after that last sound was played. It looks to me as if that would be a difference of 2 seconds.

[Hassan Bosha]

actually it works , but the problem is that it has pauses of silence , the song is not streaming as normal instead it works for 3 seconds take a pause of silence for 1/2 seconds and then continue and so on

What is it ?

[Hassan Bosha]

Would it improve anything if i put audioplayer() out of the loop ?

and where should i put it if so ?

[Walter Roberson]

The analyzer is not noticing that you are playing different sounds each time.

Any one audioplayer object is for playing one sound, possibly positioning to different parts of it (though that is not simple.) To play a different sound you need a different audioplayer object. Creation and deletion of those objects is a bit slow. The only way to get streaming would be to have the objects prepared in advance and have the stopfcn of one start the playing of another.

If you want streaming audio then you should give up compatibility with wavplay(), which never supported streaming audio. You should instead switch to the tools available through the Audio System Toolbox: those tools permit you to queue samples to be played while playing is going on.

[Hassan Bosha]

will that possible to be done through my code ?

if it's can u show some code examples ?

[Walter Roberson]

See Mathworks example

Answer 2

[Jeje Ahmad]

Hi i am trying a code but give me this error

Undefined function or variable 'audioplayr'.

Error in CELP_RUN (line 31)

wavplay(x,8000); and my virsion matlab is 2016a

can you help me?

@Walter Roberson

[Walter Roberson]

You must have added your own wavplay() as wavplay() did not exist in R2016a.

When you created that function, you misspelt audioplayr which should be audioplayer

[Jeje Ahmad]

i add the function wavpaly() but still give me the error

[Jeje Ahmad]

https://in.mathworks.com/matlabcentral/fileexchange/39038-celp-codec?focused=5252097&tab=function&s_tid=gn_loc_drop

i am test this code but give me this errot

Undefined function or variable 'audioplayr'.

Error in CELP_RUN (line 34)

audioplayr(xhat1,8000);

[Walter Roberson]

You need to create a file named audioplayr.m with content

function varargout = audioplayr(varargin)
  [varargout{:}] = audioplayer(varargin{:});