8/29/2023 0 Comments Sidplay audio decoderThe audio driver works in conjunction with the Portcls system driver, Portcls.sys, which is an inbox component of Windows.Ĭompared to other device classes, the audio subsystem is unique in the way that it does power management when the platform is in the connected standby power state (that is, when the screen is turned off). The audio hardware vendor must implement the audio driver as a Port Class (Portcls) miniport driver. Therefore, the system integrator should work closely with the SoC silicon vendor on audio subsystem integration and power management. This single audio driver is responsible for managing both the components that are integrated into the SoC and the off-SoC components that can be selected by the system integrator. However, Windows expects a single audio driver to manage both the on-SoC audio processing engines and the off-SoC codec. Like with a camera subsystem, the audio subsystem features both on-SoC and off-SoC components. Drives externally attached analog headphones.Translates decoded digital streams into analog sounds.In addition to the SoC function blocks that do offloaded audio processing, each connected standby platform includes an off-SoC component, called a codec, that does the following: An off-SoC component is external to the SoC chip. In the following discussion, the term on-SoC component describes a component that is integrated into the SoC chip. The following article discusses audio subsystem power management for connected standby platforms. This video shows how to use Windows Performance Analyzer (WPA) to verify that a computer enters the low-power state during screen-off audio playback (also known as low-power audio, or LPA).
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