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Diffstat (limited to 'pd/portaudio_v18/pa_mac_core/notes.txt')
| -rw-r--r-- | pd/portaudio_v18/pa_mac_core/notes.txt | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/pd/portaudio_v18/pa_mac_core/notes.txt b/pd/portaudio_v18/pa_mac_core/notes.txt new file mode 100644 index 00000000..3b557d9a --- /dev/null +++ b/pd/portaudio_v18/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 October 18, 2002 + +WHAT WORKS + +Output with very low latency, <10 msec. +Half duplex input or output. +Full duplex +The paFLoat32, paInt16, paInt8, paUInt8 sample formats. +Pa_GetCPULoad() +Pa_StreamTime() + +KNOWN BUGS OR LIMITATIONS + +The iMic supports multiple sample rates. +But there is a bug when changing sample rates: + Run patest_record.c at rate A - it works. + Then run patest_record.c at rate B - it FAIL! + Then run patest_record.c again at rate B - it works! + + +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. |