load_audiodata.m

非常好的数字处理教程

%
function audiodata = load_audiodata(varargin)

	savedir = pwd;
	if nargin == 1,
		filenamepath = varargin{1};
	else
		try 
			cd([ssumroot, 'data/sounds']);
		catch
			fprintf('Cannot find %s...\n', [ssumroot, 'data/sounds']);
		end
		% Also be able to select aiff
		[filename,path] = uigetfile({'*.wav;*.waV;*.aif;*.aiff','Sound Files'; ...
            '*.*', 'All files (*.*)'}, ...
            'Select a sound file');
		if isequal(filename,0) | isequal(path,0)
			cd(savedir);
			return;
		end
		filenamepath = [path filename];
	end

	audiodata = struct('data',[],'Fs',44100,'nBits',16,'filenamepath','');
	[t,extension] = strtok(filenamepath,'.');
	switch(lower(extension(end-3:end)))
		case '.wav'
			audiodata.filenamepath = filenamepath;
			[audiodata.data, audiodata.Fs, audiodata.nBits] = ...
					wavread(filenamepath);
			audiodata.channels = size(audiodata.data,2);
		case {'.aiff', '.aif'}
            audiodata.filenamepath = filenamepath;
            [y,fs,wmode,fidx] = readaif(filenamepath,'r');
            %y = y./(2^fidx(6)-1);
            %(2^fidx(6)-1)
            audiodata.data = y;
            audiodata.Fs = fs;
            audiodata.nBits = 16;
            audiodata.channels = size(y,2);
		case '.mat'
			%fprintf('Loading database...\n');
			audiodata = load(filenamepath);
			audiodata = audiodata.database;
	end
	cd(savedir);