diff options
Diffstat (limited to 'pd/portaudio/src/hostapi/coreaudio/notes.txt')
| -rw-r--r-- | pd/portaudio/src/hostapi/coreaudio/notes.txt | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/pd/portaudio/src/hostapi/coreaudio/notes.txt b/pd/portaudio/src/hostapi/coreaudio/notes.txt index ffe96962..145afe15 100644 --- a/pd/portaudio/src/hostapi/coreaudio/notes.txt +++ b/pd/portaudio/src/hostapi/coreaudio/notes.txt @@ -73,17 +73,24 @@ the stream with it. See below for creating a channel map. Known issues: -- Latency: Latency settings are ignored in most cases. Exceptions are when -doing I/O between different devices and as a hint for selecting a realtively -low or relatively high latency in conjunction with -paHostFramesPerBufferUnspecified. Latency settings are always automatically -bound to "safe" values, however, so setting extreme values here should not be +- Buffering: No buffering beyond that provided by core audio is provided +except where absolutely needed for the implementation to work. This may cause +issues with large framesPerBuffer settings and it also means that no additional +latency will be provided even if a large latency setting is selected. + +- Latency: Latency settings are generally ignored. They may be used as a +hint for buffer size in paHostFramesPerBufferUnspecified, or the value may +be used in cases where additional buffering is needed, such as doing input and +output on seperate devices. Latency settings are always automatically bound +to "safe" values, however, so setting extreme values here should not be an issue. - Buffer Size: paHostFramesPerBufferUnspecified and specific host buffer sizes are supported. paHostFramesPerBufferUnspecified works best in "pro" mode, where the buffer size and sample rate of the audio device is most likely -to match the expected values. +to match the expected values. In the case of paHostFramesPerBuffer, an +appropriate framesPerBuffer value will be used that guarantees minimum +requested latency if that's possible. - Timing info. It reports on stream time, but I'm probably doing something wrong since patest_sine_time often reports negative latency numbers. Also, @@ -111,8 +118,7 @@ render quyality property is used to set the sample rate conversion quality as "documented" here: http://lists.apple.com/archives/coreaudio-api/2004/Jan/msg00141.html -- x86/Universal Binary: to build a universal binary, be sure to use -the darwin makefile and not the usual configure && make combo. +- x86/Universal Binary: Universal binaries can be build. |