hdaudio.h header

This header is used by audio. For more information, see:

• Audio

hdaudio.h contains the following programming interfaces:

Callback functions

PALLOCATE_CAPTURE_DMA_ENGINE The AllocateCaptureDmaEngine routine allocates a DMA engine for a capture stream.The function pointer type for an AllocateCaptureDmaEngine routine is defined as follows.
PALLOCATE_CONTIGUOUS_DMA_BUFFER The AllocateContiguousDmaBuffer routine allocates a DMA buffer that consists of a single, contiguous block of physical memory.The function pointer type for an AllocateContiguousDmaBuffer routine is defined as follows.
PALLOCATE_DMA_BUFFER The AllocateDmaBuffer routine allocates a data buffer in system memory for a DMA engine.The function pointer type for an AllocateDmaBuffer routine is defined as follows.
PALLOCATE_DMA_BUFFER_WITH_NOTIFICATION The AllocateDmaBufferWithNotification routine allocates a data buffer in system memory for a DMA engine.The function pointer type for an AllocateDmaBufferWithNotification routine is defined as follows.
PALLOCATE_RENDER_DMA_ENGINE The AllocateRenderDmaEngine routine allocates a DMA engine for a render stream.The function pointer type for an AllocateRenderDmaEngine routine is defined as follows.
PCHANGE_BANDWIDTH_ALLOCATION The ChangeBandwidthAllocation routine changes a DMA engine's bandwidth allocation on the HD Audio Link.The function pointer type for a ChangeBandwidthAllocation routine is defined as follows.
PFREE_CONTIGUOUS_DMA_BUFFER The FreeContiguousDmaBuffer routine frees a DMA buffer and buffer descriptor list (BDL) that were allocated by a call to AllocateContiguousDmaBuffer.The function pointer type for a FreeContiguousDmaBuffer routine is defined as follows.
PFREE_DMA_BUFFER The FreeDmaBuffer routine frees a DMA buffer that was previously allocated by a call to AllocateDmaBuffer.The function pointer type for a FreeDmaBuffer routine is defined as follows.
PFREE_DMA_BUFFER_WITH_NOTIFICATION The FreeDmaBufferWithNotification routine frees a DMA buffer that was previously allocated by a call to AllocateDmaBufferWithNotification.The function pointer type for a FreeDmaBufferWithNotification routine is defined as follows.
PFREE_DMA_ENGINE The FreeDmaEngine routine frees a DMA engine that was previously allocated by a call to AllocateCaptureDmaEngine or AllocateRenderDmaEngine.The function pointer type for a FreeDmaEngine routine is defined as follows.
PGET_DEVICE_INFORMATION The GetDeviceInformation routine retrieves information about the HD Audio controller device.The function pointer type for a GetDeviceInformation routine is defined as follows.
PGET_LINK_POSITION_REGISTER The GetLinkPositionRegister routine retrieves a pointer to a DMA engine's link position register.The function pointer type for a GetLinkPositionRegister routine is defined as follows.
PGET_RESOURCE_INFORMATION The GetResourceInformation routine retrieves information about hardware resources.The function pointer type for a GetResourceInformation routine is defined as follows.
PGET_WALL_CLOCK_REGISTER The GetWallClockRegister routine retrieves a pointer to the wall clock register.The function pointer type for a GetWallClockRegister routine is defined as follows.
PHDAUDIO_BDL_ISR The HDAudioBdlIsr routine is the ISR that the HD Audio bus driver calls each time an IOC interrupt occurs on the stream. It is a function pointer of type PHDAUDIO_BDL_ISR, which is defined as follows.
PHDAUDIO_DMA_NOTIFICATION_CALLBACK HDAudio codec DMA Notification Callback function.
PHDAUDIO_TRANSFER_COMPLETE_CALLBACK HDAudio codec transfer complete callback function. PHDAUDIO_TRANSFER_COMPLETE_CALLBACK is used by the PTRANSFER_CODEC_VERBS callback function.
PHDAUDIO_UNSOLICITED_RESPONSE_CALLBACK HDAudio codec unsolicited response callback function. PHDAUDIO_UNSOLICITED_RESPONSE_CALLBACK is used by the PREGISTER_EVENT_CALLBACK callback function.
PREGISTER_EVENT_CALLBACK The RegisterEventCallback routine registers a callback routine for an unsolicited response from a codec or codecs.The function pointer type for a RegisterEventCallback routine is defined as follows.
PREGISTER_NOTIFICATION_CALLBACK The RegisterNotificationCallback routine registers a callback routine so that it can receive DMA progress notifications with more accurate timing information.
PREGISTER_NOTIFICATION_EVENT The RegisterNotificationEvent routine registers a kernel event so that it can receive DMA progress notifications.The function pointer type for a RegisterNotificationEvent routine is defined as follows.
PSET_DMA_ENGINE_STATE The SetDmaEngineState routine sets the state of one or more DMA engines to the Running, Stopped, Paused, or Reset state.The function pointer type for a SetDmaEngineState routine is defined as follows.
PSETUP_DMA_ENGINE_WITH_BDL The SetupDmaEngineWithBdl routine sets up a DMA engine to use a caller-allocated DMA buffer.The function pointer type for a SetupDmaEngineWithBdl routine is defined as follows.
PTRANSFER_CODEC_VERBS The TransferCodecVerbs routine transfers one or more commands to a codec or codecs and retrieves the responses to those commands.The function pointer type for a TransferCodecVerbs routine is defined as follows.
PUNREGISTER_EVENT_CALLBACK The UnregisterEventCallback routine deletes the registration of an event callback that was previously registered by a call to RegisterEventCallback.The function pointer type for an UnregisterEventCallback routine is defined as follows.
PUNREGISTER_NOTIFICATION_CALLBACK The PUNREGISTER_NOTIFICATION_CALLBACK callback function deletes the registration of a notification callback routine that was previously registered by a call to RegisterNotificationCallback.
PUNREGISTER_NOTIFICATION_EVENT The UnregisterNotificationEvent routine deletes the registration of an event that was previously registered by a call to RegisterNotificationEvent.The function pointer type for an UnregisterNotificationEvent routine is defined as follows.

Structures

HDAUDIO_BUFFER_DESCRIPTOR The HDAUDIO_BUFFER_DESCRIPTOR structure specifies a buffer descriptor, which is an entry in a buffer descriptor list (BDL).
HDAUDIO_BUS_INTERFACE The HDAUDIO_BUS_INTERFACE structure specifies the information that a client requires to call the routines in the HDAUDIO_BUS_INTERFACE version of the HD Audio DDI. Another variant of this DDI is specified by the HDAUDIO_BUS_INTERFACE_BDL structure.
HDAUDIO_BUS_INTERFACE_BDL The HDAUDIO_BUS_INTERFACE_BDL structure specifies the information that a client requires to call the routines in the HDAUDIO_BUS_INTERFACE_BDL version of the HD Audio DDI. Another variant of this DDI is specified by the HDAUDIO_BUS_INTERFACE structure.
HDAUDIO_BUS_INTERFACE_V2 The HDAUDIO_BUS_INTERFACE_V2 structure specifies the information that a client requires to call the routines in the HDAUDIO_BUS_INTERFACE_V2 version of the HD Audio DDI.
HDAUDIO_BUS_INTERFACE_V3 Learn more about: _HDAUDIO_BUS_INTERFACE_V3 structure
HDAUDIO_CODEC_COMMAND The HDAUDIO_CODEC_COMMAND structure specifies a codec command.
HDAUDIO_CODEC_RESPONSE The HDAUDIO_CODEC_RESPONSE structure specifies either a response to a codec command or an unsolicited response from a codec.
HDAUDIO_CODEC_TRANSFER The HDAUDIO_CODEC_TRANSFER structure specifies a codec command and the response to that command.
HDAUDIO_CONVERTER_FORMAT The HDAUDIO_CONVERTER_FORMAT structure specifies the 16-bit encoded stream format for an input or output converter, as defined in the Intel High Definition Audio Specification (see the Intel HD Audio website).
HDAUDIO_DEVICE_INFORMATION The HDAUDIO_DEVICE_INFORMATION structure specifies the hardware capabilities of the HD Audio bus controller.
HDAUDIO_DEVICE_INFORMATION_V2 The HDAUDIO_DEVICE_INFORMATION_V2 structure specifies the hardware capabilities of the HD Audio bus controller.
HDAUDIO_STREAM_FORMAT The HDAUDIO_STREAM_FORMAT structure describes the data format of a capture or render stream.

Enumerations

HDAUDIO_CODEC_POWER_STATE The HDAUDIO_CODEC_POWER_STATE enumeration defines constants that specify the different power states that HD Audio codecs can support. All states are from DEVICE_POWER_STATE except PowerCodecD3Cold.
HDAUDIO_STREAM_STATE The HDAUDIO_STREAM_STATE enumeration defines constants that specify the different stream states supported by HDAudio.