> ## Documentation Index > Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt > Use this file to discover all available pages before exploring further. # AcpHal > AcpHal # AcpHal ## Interfaces | Interface | Description | | ------------------------------------------------------------- | -------------------------------- | | [IAcpHal](/reference/audio/acphal/interfaces/IAcpHal/iacphal) | Allows interaction with the ACP. | ## Functions | Function | Description | | -------------------------------------------------------------------------------------------- | ------------------------------------------- | | [AcpHalAllocateShapeContexts](/reference/audio/acphal/functions/acphalallocateshapecontexts) | Allocates context arrays for SHAPE and XMA. | | [AcpHalCreate](/reference/audio/acphal/functions/acphalcreate) | Creates an instance of the ACP interface. | | [AcpHalReleaseShapeContexts](/reference/audio/acphal/functions/acphalreleaseshapecontexts) | Releases SHAPE and XMA context arrays. | ## Structures | Structure | Description | | ----------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- | | [ACP\_COMMAND\_ENABLE\_OR\_DISABLE\_XMA\_CONTEXT](/reference/audio/acphal/structs/acp_command_enable_or_disable_xma_context) | Command for enabling or disabling an XMA context. | | [ACP\_COMMAND\_ENABLE\_OR\_DISABLE\_XMA\_CONTEXTS](/reference/audio/acphal/structs/acp_command_enable_or_disable_xma_contexts) | Command for enabling or disabling a series of XMA contexts. | | [ACP\_COMMAND\_INCREMENT\_DMA\_POINTER](/reference/audio/acphal/structs/acp_command_increment_dma_pointer) | Command for updating a DMA read or write pointer. | | [ACP\_COMMAND\_INCREMENT\_PCM\_WRITE\_POINTER](/reference/audio/acphal/structs/acp_command_increment_pcm_write_pointer) | Command for updating a PCM write pointer. | | [ACP\_COMMAND\_INCREMENT\_XMA\_WRITE\_BUFFER\_OFFSET\_READ](/reference/audio/acphal/structs/acp_command_increment_xma_write_buffer_offset_read) | Increments the read offset of the output buffer of a SHAPE\_XMA\_CONTEXT structure. | | [ACP\_COMMAND\_LOAD\_SHAPE\_FLOWGRAPH](/reference/audio/acphal/structs/acp_command_load_shape_flowgraph) | Command for loading a flowgraph. | | [ACP\_COMMAND\_MESSAGE](/reference/audio/acphal/structs/acp_command_message) | Registers or unregisters one or more command messages. | | [ACP\_COMMAND\_UPDATE\_ALL\_CONTEXTS](/reference/audio/acphal/structs/acp_command_update_all_contexts) | Command for updating arrays of all SHAPE context types. | | [ACP\_COMMAND\_UPDATE\_CONTEXTS](/reference/audio/acphal/structs/acp_command_update_contexts) | Command for updating an array of a single SHAPE context type. | | [ACP\_COMMAND\_UPDATE\_DMA\_CONTEXT](/reference/audio/acphal/structs/acp_command_update_dma_context) | Command for updating a DMA context. | | [ACP\_COMMAND\_UPDATE\_DMA\_READ\_CONTEXT\_ENTRY](/reference/audio/acphal/structs/acp_command_update_dma_read_context_entry) | Entry for updating a SHAPE\_DMA\_CONTEXT that reads from a mix buffer. | | [ACP\_COMMAND\_UPDATE\_DMA\_WRITE\_CONTEXT\_ENTRY](/reference/audio/acphal/structs/acp_command_update_dma_write_context_entry) | Entry for updating a SHAPE\_DMA\_CONTEXT that writes to a mix buffer. | | [ACP\_COMMAND\_UPDATE\_EQCOMP\_CONTEXT](/reference/audio/acphal/structs/acp_command_update_eqcomp_context) | Command for updating an EQ/Comp context. | | [ACP\_COMMAND\_UPDATE\_EQCOMP\_CONTEXT\_ENTRY](/reference/audio/acphal/structs/acp_command_update_eqcomp_context_entry) | Entry for updating SHAPE\_EQCOMP\_CONTEXT. | | [ACP\_COMMAND\_UPDATE\_FILTVOL\_CONTEXT](/reference/audio/acphal/structs/acp_command_update_filtvol_context) | Command for updating a Filter/Volume context. | | [ACP\_COMMAND\_UPDATE\_FILTVOL\_CONTEXT\_ENTRY](/reference/audio/acphal/structs/acp_command_update_filtvol_context_entry) | Entry for updating SHAPE\_FILTVOL\_CONTEXT. | | [ACP\_COMMAND\_UPDATE\_PCM\_CONTEXT](/reference/audio/acphal/structs/acp_command_update_pcm_context) | Command for updating a PCM context. | | [ACP\_COMMAND\_UPDATE\_PCM\_CONTEXT\_ENTRY](/reference/audio/acphal/structs/acp_command_update_pcm_context_entry) | Entry for updating a SHAPE\_PCM\_CONTEXT. | | [ACP\_COMMAND\_UPDATE\_SRC\_CONTEXT](/reference/audio/acphal/structs/acp_command_update_src_context) | Command for updating an SRC context. | | [ACP\_COMMAND\_UPDATE\_SRC\_CONTEXT\_ENTRY](/reference/audio/acphal/structs/acp_command_update_src_context_entry) | Entry for updating SHAPE\_SRC\_CONTEXT. | | [ACP\_COMMAND\_UPDATE\_XMA\_CONTEXT](/reference/audio/acphal/structs/acp_command_update_xma_context) | Command for updating an XMA context. | | [ACP\_COMMAND\_UPDATE\_XMA\_CONTEXT\_ENTRY](/reference/audio/acphal/structs/acp_command_update_xma_context_entry) | Entry for updating a SHAPE\_XMA\_CONTEXT. | | [ACP\_COMMAND\_UPDATE\_XMA\_READ\_BUFFER](/reference/audio/acphal/structs/acp_command_update_xma_read_buffer) | Updates all the elements of a SHAPE\_XMA\_CONTEXT required for streaming encoded data. | | [ACP\_MESSAGE](/reference/audio/acphal/structs/acp_message) | Message from the ACP. | | [ACP\_MESSAGE\_AUDIO\_FRAME\_START](/reference/audio/acphal/structs/acp_message_audio_frame_start) | Audio frame start message. | | [ACP\_MESSAGE\_COMMAND\_COMPLETED](/reference/audio/acphal/structs/acp_message_command_completed) | An ACP command has completed. | | [ACP\_MESSAGE\_ERROR](/reference/audio/acphal/structs/acp_message_error) | Error message from the ACP. | | [ACP\_MESSAGE\_FLOWGRAPH\_COMPLETED](/reference/audio/acphal/structs/acp_message_flowgraph_completed) | Flowgraph completed message. | | [ACP\_MESSAGE\_FLOWGRAPH\_TERMINATED](/reference/audio/acphal/structs/acp_message_flowgraph_terminated) | Flowgraph terminated message. | | [ACP\_MESSAGE\_SHAPE\_COMMAND\_BLOCKED](/reference/audio/acphal/structs/acp_message_shape_command_blocked) | SHAPE command (SRC or DMA) context is blocked. | | [SHAPE\_CONTEXTS](/reference/audio/acphal/structs/shape_contexts) | SHAPE context data. | | [SHARED\_SHAPE\_CONTEXTS](/reference/audio/acphal/structs/shared_shape_contexts) | This structure is used when sharing SHAPE and XMA resources with XAudio2. | ## Enumerations | Enumeration | Description | | --------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ | | [ACP\_COMMAND\_TYPE](/reference/audio/acphal/enums/acp_command_type) | Enumerates the ACP command types. | | [ACP\_FLOWGRAPH\_TERMINATED\_REASON](/reference/audio/acphal/enums/acp_flowgraph_terminated_reason) | The reasons flowgraph processing was terminated. | | [ACP\_MESSAGE\_TYPE](/reference/audio/acphal/enums/acp_message_type) | Enumerates the ACP message types. | | [ACP\_SUBMIT\_COMMAND\_TYPE](/reference/audio/acphal/enums/acp_submit_command_type) | Indicates whether to check the command to be submitted and all past commands are completed before returning. | ## Related topics - [AcpHalCreate](/reference/audio/acphal/functions/acphalcreate.md) - [IAcpHal::Disconnect](/reference/audio/acphal/interfaces/IAcpHal/methods/iacphal_disconnect.md) - [IAcpHal::Connect](/reference/audio/acphal/interfaces/IAcpHal/methods/iacphal_connect.md) - [AcpHalAllocateShapeContexts](/reference/audio/acphal/functions/acphalallocateshapecontexts.md) - [AcpHalReleaseShapeContexts](/reference/audio/acphal/functions/acphalreleaseshapecontexts.md)