The following table shows the meaning of these settings.
Hardware and sound control panel full#
The hardware-acceleration slider has four settings that range from None (level 0) on the left to Full (level three) on the right. On the Audio tab, select a device from the Sound Playback list.Īt this point, you should see two sliders that are labeled Hardware acceleration and Sample rate conversion quality. In Control Panel, double-click the Sounds and Audio Devices icon (or just run mmsys.cpl). To locate the DirectSound hardware-acceleration and SRC sliders in Windows, for example, follow these steps: For more information about the Windows multimedia waveOut API, see the Microsoft Windows SDK documentation. Also, in all current versions of Windows, waveOut applications are unable to use hardware-accelerated pins on audio devices and are unaffected by the setting of the DirectSound hardware-acceleration slider. Note that the waveOut API always uses the best SRC quality regardless of the setting of the DirectSound SRC slider. These settings affect only DirectSound applications.
Hardware and sound control panel software#
This behavior improves stability and prevents software from placing the audio system in a state from which it cannot be removed without rebooting. No API is available for changing the hardware-acceleration or SRC setting from an application program. The hardware-acceleration and SRC settings can be changed only by direct end-user action.
Changes made to the hardware-acceleration and SRC sliders are persistent across boot-ups.
The sliders control the level of hardware acceleration and quality of sample-rate conversion (SRC) that are made available to DirectSound applications. Windows provides global slider controls for altering DirectSound performance on a system-wide basis.
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