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wasapi: new WASAPI specific API PaWasapi_UpdateDeviceList() which allows to update WASAPI device list dynamically without a need to call Pa_Terminate() and then Pa_Initialize().

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This new implementation overcomes current limitation of Pa_GetDeviceCount() API which gives constant device count by making WASAPI device list constant (32 devices by default) where 32 device slots can either be filled with a real device info or be empty for a future device changes.

Constant device list size can be altered by PA_WASAPI_MAX_CONST_DEVICE_COUNT define during a compile time. If PA_WASAPI_MAX_CONST_DEVICE_COUNT is set to 0 then PaWasapi_UpdateDeviceList() will be unavailable as well as dynamic device list update functionality.

This implementation also detects the audio device format change if user alters it via Windows Audio Controller GUI.

This implementation also makes WASAPI backend ready for a future implementation of device list updates via PortAudio public API. See internal PaError UpdateDeviceList().
This commit is contained in:
dmitrykos 2018-04-02 21:50:16 +03:00
commit eb62287494
2 changed files with 211 additions and 103 deletions
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14
include/pa_win_wasapi.h
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@ -291,6 +291,18 @@ typedef struct PaWasapiStreamInfo
PaWasapiStreamInfo;
/** Update device list.
This function will be available if PA_WASAPI_MAX_CONST_DEVICE_COUNT is defined with maximum
constant WASAPI device count (defined by default with value 32).
If PA_WASAPI_MAX_CONST_DEVICE_COUNT is set to 0 during compile time the implementation will not
define PaWasapi_UpdateDeviceList() and thus updating device list can only be possible by calling
Pa_Terminate() and then Pa_Initialize().
@return Error code indicating success or failure.
*/
PaError PaWasapi_UpdateDeviceList();
/** Returns default sound format for device. Format is represented by PaWinWaveFormat or
WAVEFORMATEXTENSIBLE structure.
@ -356,6 +368,7 @@ PaError PaWasapi_GetFramesPerHostBuffer( PaStream *pStream, unsigned int *nInput
/** Get number of jacks associated with a WASAPI device. Use this method to determine if
there are any jacks associated with the provided WASAPI device. Not all audio devices
will support this capability. This is valid for both input and output devices.
@param nDevice device index.
@param jcount Number of jacks is returned in this variable
@return Error code indicating success or failure
@ -369,6 +382,7 @@ PaError PaWasapi_GetJackCount(PaDeviceIndex nDevice, int *jcount);
number of jacks associated with device. If jcount is greater than zero, then
each jack from 0 to jcount can be queried with this function to get the jack
description.
@param nDevice device index.
@param jindex Which jack to return information
@param KSJACK_DESCRIPTION This structure filled in on success.