14.1.1 Reading a wav file: readwav
The readwav command takes as argument a sound file stored in
WAV format (file extension: .wav), given as a string.
readwav returns a vector consisting of:
-
A list consisting of:
-
The number of channels (generally 1 for mono and 2 for
stereo).
- The number of bits (generally 16).
- The sampling frequency (44100 for a CD quality sound).
- The number of bytes (excluding the header); i.e., the number
of seconds times the sampling frequency times the number of
bits/8 times the number of channels.
- A list of digital sound data for each channel.
The result of readwav is typically stored in a variable.
For example, if sound.wav is a sound file for a one-second
sound in CD quality on a 16-bit channel:
Input:
s := readwav("sound.wav")
then:
s[0]
Output:
[1,16,44100,88200]
Input:
size(s)
Output:
2
which is the number of channels plus 1.
Input:
size(s[1])
Output:
44100