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Diffstat (limited to 'pd/portaudio/pa_mac_core/notes.txt')
| -rw-r--r-- | pd/portaudio/pa_mac_core/notes.txt | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/pd/portaudio/pa_mac_core/notes.txt b/pd/portaudio/pa_mac_core/notes.txt new file mode 100644 index 00000000..c79b90e6 --- /dev/null +++ b/pd/portaudio/pa_mac_core/notes.txt @@ -0,0 +1,34 @@ +Notes on Core Audio Implementation of PortAudio + +by Phil Burk and Darren Gibbs + +Document last updated March 20, 2002 + +WHAT WORKS + +Output with very low latency, <10 msec. +Half duplex input or output. +Full duplex on the same CoreAudio device. +The paFLoat32, paInt16, paInt8, paUInt8 sample formats. +Pa_GetCPULoad() +Pa_StreamTime() + +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. + +Mono doesn't work. + +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. |