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SDCFile/WCbin.m

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+## Author: Ramesh Yerraballi, Jonathan Valvano
+## Use this in octave to convert a wav file into raw binary
+##  samples with a chosen precision at 11.025kHz
+## You will need to load the signal package first to use  the decimate function
+## You can load it like this on the octave prompt:
+##    pkg load signal
+## Run in octave as:
+##    WCbin ("filename", precision);
+## The inputs are (i) the name of the wav file without the extention .wav.
+##                (ii) the sample precision in bits (e.g., 4 to 8 bits)
+## This will generate a filename.bin file that has raw binary data
+## For example, say you have a sound file called boom.wav that you want to use in
+## in your game.
+##    1. Put the WCbin.m script and the boom.wav file in a folder (say sounds).
+##    2. Open octave/matlab and cd to the sounds folder
+##    3. Run script as: WCbin("boom", 8)
+##       For 8-bit precision
+##       This will produce a file named boom.bin, which contains raw samples
+##       You can put the file on an SDC and read the data at run time
+function WCbin(filename,precision)
+  # load the file
+  [SplsOrig, fs] = audioread(strcat(filename,'.wav'));
+  # downsample to 11.025kHz
+  Spls = decimate(SplsOrig,round(fs/11025));
+  # trim the precision of each sample
+  Spls = round((Spls+ 1)* (2^precision-1)/2);
+  # write raw binary to file with bin extension
+  file = fopen(strcat(filename,'.bin'), 'w');
+  fwrite(file, Spls(1:length(Spls)));
+  fclose(file);
+end