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/*
* Mac spcific flags for PA.
* portaudio.h should be included before this file.
*/
/*
* A pointer to a paMacCoreStreamInfo may be passed as
* the hostApiSpecificStreamInfo in the PaStreamParameters struct
* when opening a stream. Use NULL, for the defaults. Note that for
* duplex streams, both infos should be the same or behaviour
* is undefined.
*/
typedef struct paMacCoreStreamInfo
{
unsigned long size; /**size of whole structure including this header */
PaHostApiTypeId hostApiType;/**host API for which this data is intended */
unsigned long version; /**structure version */
unsigned long flags; /* flags to modify behaviour */
} paMacCoreStreamInfo;
/* Use this function to initialize a paMacCoreStreamInfo struct
using the requested flags. */
void paSetupMacCoreStreamInfo( paMacCoreStreamInfo *data, unsigned long flags )
{
bzero( data, sizeof( paMacCoreStreamInfo ) );
data->size = sizeof( paMacCoreStreamInfo );
data->hostApiType = paCoreAudio;
data->version = 0x01;
data->flags = flags;
}
/*
* The following flags alter the behaviour of PA on the mac platform.
* they can be ORed together. These should work both for opening and
* checking a device.
*/
/* Allows PortAudio to change things like the device's frame size,
* which allows for much lower latency, but might disrupt the device
* if other programs are using it. */
const unsigned long paMacCore_ChangeDeviceParameters = 0x01;
/* In combination with the above flag,
* causes the stream opening to fail, unless the exact sample rates
* are supported by the device. */
const unsigned long paMacCore_FailIfConversionRequired = 0x02;
/* These flags set the SR conversion quality, if required. The wierd ordering
* allows Maximum Quality to be the default.*/
const unsigned long paMacCore_ConversionQualityMin = 0x0100;
const unsigned long paMacCore_ConversionQualityMedium = 0x0200;
const unsigned long paMacCore_ConversionQualityLow = 0x0300;
const unsigned long paMacCore_ConversionQualityHigh = 0x0400;
const unsigned long paMacCore_ConversionQualityMax = 0x0000;
/*
* Here are some "preset" combinations of flags (above) to get to some
* common configurations. THIS IS OVERKILL, but if more flags are added
* it won't be.
*/
/*This is the default setting: do as much sample rate conversion as possible
* and as little mucking with the device as possible. */
const unsigned long paMacCorePlayNice = 0x00;
/*This setting is tuned for pro audio apps. It allows SR conversion on input
and output, but it tries to set the appropriate SR on the device.*/
const unsigned long paMacCorePro = 0x01;
/*This is a setting to minimize CPU usage and still play nice.*/
const unsigned long paMacCoreMinimizeCPUButPlayNice = 0x0100;
/*This is a setting to minimize CPU usage, even if that means interrupting the device. */
const unsigned long paMacCoreMinimizeCPU = 0x0101;
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