Undefined function or variable 'pawavplayw'.

I am new to matlab. I am trying to run a code in matlab. The code uses : 'pa_wavplay' which requires some .dll files. On running the code using a figure, I get the following error:

Undefined function or variable 'pawavplayw'.

The file pawavplayw.dll is present in the directory. But, still I am getting the error.

function pa_wavplay(varargin)
%    pa_wavplay: playback a matrix to multichannel sound hardware
%
%    Usage: pa_wavplay([devicetype])
%           pa_wavplay(buffer, [samplerate], [deviceid], [devicetype])
% 
%    pa_wavplay is a tool for playing multi-channel audio through your ASIO
%    device. Arguments in [] are optional
%
%    pa_wavplay([devicetype]) will list all your audio devices for that
%    device type then exit.
%
%    - buffer       is the matrix to play
%    - samplerate  is the sampling frequency. Default: 44100
%    - deviceid   is the device id to use for output. Default: 0
%    - devicetype   determines which sound driver to use
%        'win'      Windows Multimedia Device
%        'dx'       DirectX DirectSound driver
%        'asio'     ASIO Driver (default)
% 
%    For stereo playback, buffer should be an N-by-2 matrix. The number of
%    audio channels supported is hardware dependent.
% 
%    samplerate should be a valid integer sample rate, eg. 22050 44100 etc.
%  
%    As of pa_wavplay 0.2, buffer should be either of type double or
%    single. pa_wavplay uses 32-bit floats (single) internally.
%
%    SEE ALSO: pa_wavrecord, pa_wavplayrecord

% check right num of args
error(nargchk(0,4,nargin));

% defaults
device_opt = 1;
device = 0;
fs = 44100;

% no args, print devices for asio
if (nargin==0)
    pawavplaya;
    return;
end

% if devtype specified
if ischar(varargin{end}),
   s=varargin{end};
   varargin(end)=[];

     device_opt = strmatch(s,{'asio','win', 'dx'});
     if isempty(device_opt),
         error(['Unrecognized DEVICETYPE: ' s]);
     end

     if (nargin==1)
         if device_opt==1, % asio
             pawavplaya;
         end
         if device_opt==2, % win
             pawavplayw;
         end     
         if device_opt==3, % dx
             pawavplayx;
         end
         return;
      end
  end

% data buffer
y = varargin{1};

% sample rate
if length(varargin)>=2,
   fs=varargin{2};
end

% device id
if length(varargin) >= 3,
    if (~(ischar(varargin{3})))
        device = varargin{3};
    end
end

if device_opt==1, % asio
    fprintf('Using ASIO driver\n');
    pawavplaya(y, device, fs, 0, 0, 0, -1);

elseif device_opt==2, % win
    fprintf('Using WMME driver\n');
    pawavplayw(y, device, fs, 0, 0, 0, -1);

elseif device_opt==3, % dx
    fprintf('Using DirectX driver\n');
    pawavplayx(y, device, fs, 0, 0, 0, -1);
end

% [EOF] pa_wavplay.m

Answer 1

[Walter Roberson]

If you are using http://www.mathworks.com/matlabcentral/fileexchange/47336-pa-wavplay-for-32-bit-and-64-bit then:

Possibly you are not using MS Windows. Or possibly you have not compiled the mex source.

[Mohammad Shahjahan]

I am using the file you mentioned. Can you guide me to compile mex source?

[Walter Roberson]

Install a compatible compiler.

Download portaudio and unzip it into a new directory that is not under the MATLAB installation directories. Then follow the instructions at http://portaudio.com/docs/v19-doxydocs/compile_windows.html

Then go into MATLAB and cd to the directory that you stored the waveplay in. You will then need to use a command similar to

mex -v -I/usr/local/include -L/usr/local/lib pawavplay_asio.cpp

except that the locations /usr/local/include and /usr/local/lib will need to be adjusted according to where you installed portaudio .

I do not know the exact flags at the moment; I am still working on getting portaudio built properly on my non-Windows system. It appears the code for portaudio is faulty :(