me/portaudio
Watch
1
0
Fork
You've already forked portaudio
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

notes on CoreAudio implementation

Browse source
This commit is contained in:
phil 2002-02-07 18:15:27 +00:00
commit 2c79fcd98b
1 changed files with 32 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

32
pa_mac_core/notes.txt Normal file
View file

@ -0,0 +1,32 @@
Notes on Core Audio Implementation of PortAudio
by Phil Burk and Darren Gibbs
Document last updated Feb 7, 2002
WHAT WORKS
Output with very low latency, <10 msec.
Half duplex input or output.
Full duplex on the same CoreAudio device.
The paFLoat32 sample format.
KNOWN BUGS OR LIMITATIONS
We do not yet support simultaneous input and output on different
devices. Note that some CoreAudio devices like the Roland UH30 look
like one device but are actually two different CoreAudio devices. The
BuiltIn audio is typically one CoreAudio device.
User formats other than the native paFloat32 are not yet supported.
DEVICE MAPPING
CoreAudio devices can support both input and output. But the sample
rates supported may be different. So we have map one or two PortAudio
device to each CoreAudio device depending on whether it supports
input, output or both.
When we query devices, we first get a list of CoreAudio devices. Then
we scan the list and add a PortAudio device for each CoreAudio device
that supports input. Then we make a scan for output devices.