1. Opens the the sound card (/dev/dsp or PulseAudio via padsp) at the specified sample rate
2. send acquired waveforms to stdout.

make

or:

cc catdsp.c -o catdsp

./catdsp

• -d devicename: Sets device name
• -m Sets device to run in mono. Default is stereo.
• -r rate Sets device sample rate. Default is 44100 Hz.

The program default is to output to /dev/dsp that is the file handle used by OSS. Since 1999, many Linux OS have moved to ALSA, PulseAudio, or the like. If you don't get data from:

./catdsp

try the section applying to your OS.

Consider replacing this program with equivalent functionality pacat:

pacat -r

or if you really do want to use this program with PulseAudio, consider:

padsp ./catdsp

Perhaps try sox as a replacement for this program:

rec -t raw -b 16 -e signed -