zymon/PortAudio.jl
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now setting ringbuf size and prefill to twice blocksize

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This commit is contained in:
Spencer Russell 2016-08-16 18:26:38 -04:00
parent 1d5ca112eb
commit fcf87c0c61
1 changed files with 5 additions and 8 deletions
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13
src/PortAudio.jl
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@ -15,11 +15,8 @@ include("libportaudio.jl")
export PortAudioStream
# These sizes are all in frames
# larger ringbuffer lets you fill in more and be more robust against drop-outs
const DEFAULT_RINGBUFSIZE=16384
# the prefill frames determine the in-to-out latency on a synchronized duplex stream
const DEFAULT_PREFILL=4096
# the block size is what we request from portaudio if no blocksize is given
# the block size is what we request from portaudio if no blocksize is given.
# The ringbuffer and pre-fill will be twice the blocksize
const DEFAULT_BLOCKSIZE=4096
# data is passed to and from the ringbuffer in chunks with this many frames
# it should be at most the ringbuffer size, and must evenly divide into the
@ -113,11 +110,11 @@ type PortAudioStream{T, U}
Ref(Pa_StreamParameters(outdev.idx, outchans, type_to_fmt[T], 0.0, C_NULL))
this = new(sr, blocksize, C_NULL)
finalizer(this, close)
this.sink = PortAudioSink{T, U}(outdev.name, this, outchans, DEFAULT_RINGBUFSIZE)
this.source = PortAudioSource{T, U}(indev.name, this, inchans, DEFAULT_RINGBUFSIZE)
this.sink = PortAudioSink{T, U}(outdev.name, this, outchans, blocksize*2)
this.source = PortAudioSource{T, U}(indev.name, this, inchans, blocksize*2)
if synced && inchans > 0 && outchans > 0
# we've got a synchronized duplex stream. initialize with the output buffer full
write(this.sink, SampleBuf(zeros(T, DEFAULT_PREFILL, outchans), sr))
write(this.sink, SampleBuf(zeros(T, blocksize*2, outchans), sr))
end
this.bufinfo = CallbackInfo(inchans, this.source.ringbuf,
outchans, this.sink.ringbuf, synced)