linuxaudio.org

Ivan K  writes:
> I want to write a simple application that can open a .wav file

quoted text
> (stereo or mono), grab the header, and then read and dump

> the sample values from a portion of the .wav file to an ascii data

> file (I want to plot minute portions of the sound file with

> application such as gnuplot).

FWIW, this task is incredibly easy in SuperCollider:
// Open an existing sound file

// Automatically parses the header

f = SoundFile.openRead(Platform.resourceDir +/+ "sounds/a11wlk01.wav");
// Jump ahead to a given "sample frame"

// f.sampleRate "frames" always corresponds to 1 sec,

// no matter how many channels

f.seek(4410);  // 0.1 seconds in
// Allocate space for the samples, and get them

// Channels are interleaved

d = FloatArray.newClear(50);

f.readData(d);
f.close;
// Push them out to a text file

o = File("~/samples.txt", "w");

d.do { |sample| o << sample << Char.nl };

o.close;
It's also possible to rework this (fairly minor adjustments) to run it from the

commandline. No time to do it at the moment -- maybe later, if anyone is

curious.
hjh
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