Hi there!
I got into PortAudio.jl <https://github.com/seebk/PortAudio.jl> recently
(see this <https://groups.google.com/forum/#!topic/julia-users/ooyT55TI-jk>
thread). I would like to code realtime digital filters. By that I mean that
I would like to acquire data from sound-card input(s) and, while the
acquisition goes on, filter the acquired samples and write the result to
the sound-card output(s). Latency does not need to be low. I have mostly
loudspeaker pre-hemphasis applications for acoustic measurements in mind
for that, that means I will time align what I need later on... I think the
PortAudio module should make me able to do that... but I have not figured
out how. Here what I have (very naively) tried:
iostream = open(devID, (max_input_channels, max_output_channels),
sample_rate, buf_size)
# Use a loop. Ctrl + C to exit the loop.
doloop = true
try
while doloop
ibuffer = read(iostream, buf_size) # Collect Input
obuffer = some_filtering_of(ibuffer) # Do some processing
write(iostream, obuffer) # Write it to output
end
catch excp
if isa(excp, InterruptException) # Ctrl + C generates an
InterruptException
doloop = false
end
end
Of course, there are many problems with that (it is not collecting
consecutive buffers, for example). I guess it can help you understanding
what I have in mind though.
