Here is a summary of the .WAV file header format :
4 bytes "RIFF" ID for a RIFF file
4 bytes xxxx Length of waveform (Bytes)
8 bytes "WAVEfmt " ID for a .WAV file
4 bytes xxxx Size of format section (Bytes)
2 bytes xx Format - "1" indicates PCM data
2 bytes xx Number of channels
4 bytes xxxx Sample rate (Hz)
4 bytes xxxx Data rate (Bytes per second)
2 bytes xx Bytes per sample (rounded up)
2 bytes xx Bits per sample
/additional informaiton that may be used in more complex wave files/
4 bytes "data" ID for data section
4 bytes xxxx Length of data section (Bytes)
The .wav file functions allow reading and writing of .wav files from standard C/C++ programs and includes full source code.
The library can be downloaded from : http://numerix-dsp.com/files/.