[Bug 513942] Re: truncated CW dah's on some audio devices

[Kamal Mostafa]

Running with the environment variable CWLIB_DEBUG=0xFFFFFFFE makes cwlib
emit interesting debug info.  These two lines hint at the problem:

cwlib tries to set the fragment size to 2^7 == 128, but on one soundcard
with the problem, I get:

> cw: dsp fragment size not set, 131

Then when cwlib tries to write "about 1 second of audio", it only
manages to write 2096 bytes (~ 1/4 second) before the audio fragment
buffers are full:

> cw: dsp data buffered, 800 Hz, 2096

By fiddling with the DSP rate setting code and/or the fragment size
setting code, I am able to resolve the "fragment size not set" issue,
but even with valid fragment sizes I still can only get about 1/4 second
of audio into the buffer.

Note: On soundcards which don't show this cwlib problem, the fragment
size does get set to 128, and the data buffered in the first write is
8192 bytes (one second of audio).

-- 
truncated CW dah's on some audio devices
https://bugs.launchpad.net/bugs/513942
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