jens
b31f3e7435
git-svn-id: http://moon:8086/svn/matlab/trunk@153 801c6759-fa7c-4059-a304-17956f83a07c
68 lines
2.3 KiB
Matlab
Executable File
68 lines
2.3 KiB
Matlab
Executable File
function [y,Fs,Format]=wr16(wavefile)
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%WAVREAD Load Microsoft Windows 3.1 .WAV format sound files.
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% [y]=WAVREAD(wavefile) loads a .WAV format file specified by "wavefile",
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% returning the sampled data in variable "y". The .WAV extension
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% in the filename is optional.
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%
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% [y,Fs]=WAVREAD(wavefile) loads a .WAV format file specified by
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% "wavefile", returning the sampled data in variable "y" and the
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% sample rate in variable "Fs".
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%
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% [y,Fs,Format]=WAVREAD(wavefile) loads a .WAV format file specified by
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% "wavefile",returning the sampled data in variable "y", the sample
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% rate in variable "Fs", and the .WAV file format information in
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% variable "Format". The format information is returned as a 6 element
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% vector with the following order:
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%
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% Format(1) Data format (always PCM)
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% Format(2) Number of channels
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% Format(3) Sample Rate (Fs)
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% Format(4) Average bytes per second (sampled)
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% Format(5) Block alignment of data
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% Format(6) Bits per sample
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%
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% Note: WAVREAD currently supports only 8-bit single channel data.
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%
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% See also WAVWRITE.
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% Copyright (c) 1984-94 by The MathWorks, Inc.
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if nargin~=1
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error('WAVREAD takes one argument, which is the name of the .WAV file');
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end
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if findstr(wavefile,'.')==[ ]
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wavefile=[wavefile,'.wav'];
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end
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fid=fopen(wavefile,'rb','l');
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if fid ~= -1
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% read riff chunk
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header=fread(fid,4,'uchar');
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header=fread(fid,1,'ulong');
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header=fread(fid,4,'uchar');
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% read format sub-chunk
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header=fread(fid,4,'uchar');
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header=fread(fid,1,'ulong');
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Format(1)=fread(fid,1,'ushort'); % PCM format
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Format(2)=fread(fid,1,'ushort'); % 1 channel
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Fs=fread(fid,1,'ulong'); % samples per second
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Format(3)=Fs;
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Format(4)=fread(fid,1,'ulong'); % average bytes per second
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Format(5)=fread(fid,1,'ushort'); % block alignment
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Format(6)=fread(fid,1,'ushort'); % bits per sample
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% read data sub-chunck
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header=fread(fid,4,'uchar');
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nsamples=fread(fid,1,'ulong');
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y=fread(fid,nsamples,'short');
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fclose(fid);
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end
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if fid == -1
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error('Can''t open .WAV file for input!');
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end;
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