On 24/03/13 18:24, eryksun wrote: <cut>
PulseAudio also suggests that you're using Linux or BSD, though I think it does have ports for OS X and Windows.The ossaudiodev module exists on Linux/BSD, so try something relatively simple like outputting a square wave to /dev/dsp. Here's an example device configuration: format = ossaudiodev.AFMT_U8 # unsigned 8-bit channels = 1 rate = 8000 # samples/second strict = True dsp = ossaudiodev.open('/dev/dsp', 'w') dsp.setparameters(format, channels, rate, strict) Say you want a 1000 Hz, 50% duty-cycle square wave. Given the rate is 8000 sample/s, that's 8 samples per cycle. In 8-bit mode, a cycle has four bytes at the given amplitude followed by four null bytes. For a 0.5 s beep, you need 0.5 * 1000 = 500 cycles. In general: amp = chr(amplitude) # bytes([amplitude]) in 3.x cycles = int(duration * frequency) nhalf = int(0.5 * rate / frequency) data = (amp * nhalf + b'\x00' * nhalf) * cycles Then just write the data. Make sure to close the device when you no longer need it. dsp.write(data) dsp.close() You can use threading to play the beep in the background without blocking the main thread. To me this is simpler than juggling partial writes in nonblock mode. However, you can't access the device concurrently. Instead you could make beep() a method. Then queue the requests, to be handled sequentially by a worker thread.
Thanks Erksun for your detailed reply. I've saved your reply for a rainy day.
I had discovered some information about writing to the dsp device since my original post. However, my experiments have been temporarily curtailed by a wife who wants me to spent more time building our house and less time playing with the computer.
It's amazing what's available to play with these days. -- Regards, Phil _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
