| AAX SDK 2.6.1 Avid Audio Extensions Development Kit

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AAX_IDma Class Referenceabstract

`#include <AAX_IDma.h>`

## Description

Cross-platform interface for access to the host's direct memory access (DMA) facilities.

:Implemented by the AAX Host:

This interface is provided via a DMA port in the plug-in's algorithm context.

See also
  AAX_IComponentDescriptor::AddDmaInstance()
  Direct Memory Access

## Public Types
enum | EState { eState_Error = -1 , eState_Init = 0 , eState_Running = 1 , eState_Complete = 2 , eState_Pending = 3 }
enum | EMode { eMode_Error = -1 , eMode_Burst = 6 , eMode_Gather = 10 , eMode_Scatter = 11 }
| DMA mode IDs. More...

## Public Member Functions
virtual | ~AAX_IDma ()
Basic DMA operation
virtual AAX_Result AAX_DMA_API | PostRequest ()=0
| Posts the transfer request to the DMA server.
virtual int32_t AAX_DMA_API | IsTransferComplete ()=0
| Query whether a transfer has completed.
virtual AAX_Result AAX_DMA_API | SetDmaState (EState iState)=0
| Sets the DMA State.
virtual EState AAX_DMA_API | GetDmaState () const =0
| Inquire to find the state of the DMA instance.
virtual EMode AAX_DMA_API | GetDmaMode () const =0
| Inquire to find the mode of the DMA instance.
Methods for Burst operation
Use these methods in conjunction with AAX_IDma::eMode_Burst
virtual AAX_Result AAX_DMA_API | SetSrc (int8_t *iSrc)=0
| Sets the address of the source buffer.
virtual int8_t *AAX_DMA_API | GetSrc ()=0
| Gets the address of the source buffer.
virtual AAX_Result AAX_DMA_API | SetDst (int8_t *iDst)=0
| Sets the address of the destination buffer.
virtual int8_t *AAX_DMA_API | GetDst ()=0
| Gets the address of the destination buffer.
virtual AAX_Result AAX_DMA_API | SetBurstLength (int32_t iBurstLengthBytes)=0
| Sets the length of each burst.
virtual int32_t AAX_DMA_API | GetBurstLength ()=0
| Gets the length of each burst.
virtual AAX_Result AAX_DMA_API | SetNumBursts (int32_t iNumBursts)=0
| Sets the number of bursts to perform before giving up priority to other DMA transfers.
virtual int32_t AAX_DMA_API | GetNumBursts ()=0
| Gets the number of bursts to perform before giving up priority to other DMA transfers.
virtual AAX_Result AAX_DMA_API | SetTransferSize (int32_t iTransferSizeBytes)=0
| Sets the size of the whole transfer.
virtual int32_t AAX_DMA_API | GetTransferSize ()=0
| Gets the size of the whole transfer, in Bytes.
Methods for Scatter and Gather operation
Use these methods in conjunction with AAX_IDma::eMode_Scatter and AAX_IDma::eMode_Gather
virtual AAX_Result AAX_DMA_API | SetFifoBuffer (int8_t *iFifoBase)=0
| Sets the address of the FIFO buffer for the DMA transfer (usually the external memory block)
virtual int8_t *AAX_DMA_API | GetFifoBuffer ()=0
| Gets the address of the FIFO buffer for the DMA transfer.
virtual AAX_Result AAX_DMA_API | SetLinearBuffer (int8_t *iLinearBase)=0
| Sets the address of the linear buffer for the DMA transfer (usually the internal memory block)
virtual int8_t *AAX_DMA_API | GetLinearBuffer ()=0
| Gets the address of the linear buffer for the DMA transfer.
virtual AAX_Result AAX_DMA_API | SetOffsetTable (const int32_t *iOffsetTable)=0
| Sets the offset table for the DMA transfer.
virtual const int32_t *AAX_DMA_API | GetOffsetTable ()=0
| Gets the offset table for the DMA transfer.
virtual AAX_Result AAX_DMA_API | SetNumOffsets (int32_t iNumOffsets)=0
| Sets the number of offets in the offset table.
virtual int32_t AAX_DMA_API | GetNumOffsets ()=0
| Gets the number of offets in the offset table.
virtual AAX_Result AAX_DMA_API | SetBaseOffset (int32_t iBaseOffsetBytes)=0
| Sets the relative base offset into the FIFO where transfers will begin.
virtual int32_t AAX_DMA_API | GetBaseOffset ()=0
| Gets the relative base offset into the FIFO where transfers will begin.
virtual AAX_Result AAX_DMA_API | SetFifoSize (int32_t iSizeBytes)=0
| Sets the size of the FIFO buffer, in bytes.
virtual int32_t AAX_DMA_API | GetFifoSize ()=0
| Gets the size of the FIFO buffer, in bytes.

## Member Enumeration Documentation

## ◆ EState

enum AAX_IDma::EState

Enumerator
eState_Error |
eState_Init |
eState_Running |
eState_Complete |
eState_Pending |

## ◆ EMode

enum AAX_IDma::EMode

DMA mode IDs.

These IDs are used to bind DMA context fields to a particular DMA mode when describing the fields with AAX_IComponentDescriptor::AddDmaInstance()

Enumerator
eMode_Error |
eMode_Burst | Burst mode (uncommon)
eMode_Gather | Gather mode.
eMode_Scatter | Scatter mode.

## Constructor & Destructor Documentation

## ◆ ~AAX_IDma()

virtual AAX_IDma::~AAX_IDma | ( |  | ) |
| inline virtual

## Member Function Documentation

## ◆ PostRequest()

virtual AAX_Result AAX_DMA_API AAX_IDma::PostRequest | ( |  | ) |
| pure virtual

Posts the transfer request to the DMA server.

Note
  Whichever mode this method is called on first will be the first mode to start transferring. Most plug-ins should therefore call this method for their Scatter DMA fields before their Gather DMA fields so that the scattered data is available as quickly as possible for future gathers.

Returns
  `AAX_SUCCESS` on success

## ◆ IsTransferComplete()

virtual int32_t AAX_DMA_API AAX_IDma::IsTransferComplete | ( |  | ) |
| pure virtual

Query whether a transfer has completed.

A return value of false indicates an error, and that the DMA missed its cycle count deadline

Note
  This function should not be used for polling within a Process loop! Instead, it can be used as a test for DMA failure. This test is usually performed via a Debug-only assert.

Todo:
  Clarify return value meaning – ambiguity in documentation

Returns
  true if all pending transfers are complete
  false if pending transfers are not complete

## ◆ SetDmaState()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetDmaState | ( | EState | iState | ) |
| pure virtual

Sets the DMA State.

Note
  This method is part of the host interface and should not be used by plug-ins

Returns
  `AAX_SUCCESS` on success

## ◆ GetDmaState()

virtual EState AAX_DMA_API AAX_IDma::GetDmaState | ( |  | ) | const
| pure virtual

Inquire to find the state of the DMA instance.

## ◆ GetDmaMode()

virtual EMode AAX_DMA_API AAX_IDma::GetDmaMode | ( |  | ) | const
| pure virtual

Inquire to find the mode of the DMA instance.

This value does not change, so there is no setter.

## ◆ SetSrc()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetSrc | ( | int8_t * | iSrc | ) |
| pure virtual

Sets the address of the source buffer.

Parameters

  [in] | iSrc | Address of the location in the source buffer where the read transfer should begin

Returns
  `AAX_SUCCESS` on success

## ◆ GetSrc()

virtual int8_t *AAX_DMA_API AAX_IDma::GetSrc | ( |  | ) |
| pure virtual

Gets the address of the source buffer.

## ◆ SetDst()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetDst | ( | int8_t * | iDst | ) |
| pure virtual

Sets the address of the destination buffer.

Parameters

  [in] | iDst | Address of the location in the destination buffer where the write transfer should begin

Returns
  `AAX_SUCCESS` on success

## ◆ GetDst()

virtual int8_t *AAX_DMA_API AAX_IDma::GetDst | ( |  | ) |
| pure virtual

Gets the address of the destination buffer.

## ◆ SetBurstLength()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetBurstLength | ( | int32_t | iBurstLengthBytes | ) |
| pure virtual

Sets the length of each burst.

Note
  Burst length must be between 1 and 64 Bytes, inclusive
  64-Byte transfers are recommended for the fastest overall transfer speed

Returns
  `AAX_SUCCESS` on success

## ◆ GetBurstLength()

virtual int32_t AAX_DMA_API AAX_IDma::GetBurstLength | ( |  | ) |
| pure virtual

Gets the length of each burst.

## ◆ SetNumBursts()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetNumBursts | ( | int32_t | iNumBursts | ) |
| pure virtual

Sets the number of bursts to perform before giving up priority to other DMA transfers.

Valid values are 1, 2, 4, or 16.

The full transmission may be broken up into several series of bursts, and thus the total size of the data being transferred is not bounded by the number of bursts times the burst length.

Parameters

  [in] | iNumBursts | The number of bursts

Returns
  `AAX_SUCCESS` on success

## ◆ GetNumBursts()

virtual int32_t AAX_DMA_API AAX_IDma::GetNumBursts | ( |  | ) |
| pure virtual

Gets the number of bursts to perform before giving up priority to other DMA transfers.

## ◆ SetTransferSize()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetTransferSize | ( | int32_t | iTransferSizeBytes | ) |
| pure virtual

Sets the size of the whole transfer.

Parameters

  [in] | iTransferSizeBytes | The transfer size, in Bytes

Returns
  `AAX_SUCCESS` on success

## ◆ GetTransferSize()

virtual int32_t AAX_DMA_API AAX_IDma::GetTransferSize | ( |  | ) |
| pure virtual

Gets the size of the whole transfer, in Bytes.

## ◆ SetFifoBuffer()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetFifoBuffer | ( | int8_t * | iFifoBase | ) |
| pure virtual

Sets the address of the FIFO buffer for the DMA transfer (usually the external memory block)

Returns
  `AAX_SUCCESS` on success

## ◆ GetFifoBuffer()

virtual int8_t *AAX_DMA_API AAX_IDma::GetFifoBuffer | ( |  | ) |
| pure virtual

Gets the address of the FIFO buffer for the DMA transfer.

## ◆ SetLinearBuffer()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetLinearBuffer | ( | int8_t * | iLinearBase | ) |
| pure virtual

Sets the address of the linear buffer for the DMA transfer (usually the internal memory block)

Returns
  `AAX_SUCCESS` on success

## ◆ GetLinearBuffer()

virtual int8_t *AAX_DMA_API AAX_IDma::GetLinearBuffer | ( |  | ) |
| pure virtual

Gets the address of the linear buffer for the DMA transfer.

## ◆ SetOffsetTable()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetOffsetTable | ( | const int32_t * | iOffsetTable | ) |
| pure virtual

Sets the offset table for the DMA transfer.

The offset table provides a list of Byte-aligned memory offsets into the FIFO buffer. The transfer will be broken into a series of individual bursts, each beginning at the specified offset locations within the FIFO buffer. The size of each burst is set by SetBurstLength().

See also
  AAX_IDma::SetNumOffsets()
  AAX_IDma::SetBaseOffset()

Returns
  `AAX_SUCCESS` on success

## ◆ GetOffsetTable()

virtual const int32_t *AAX_DMA_API AAX_IDma::GetOffsetTable | ( |  | ) |
| pure virtual

Gets the offset table for the DMA transfer.

## ◆ SetNumOffsets()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetNumOffsets | ( | int32_t | iNumOffsets | ) |
| pure virtual

Sets the number of offets in the offset table.

See also
  AAX_IDma::SetOffsetTable()

Returns
  `AAX_SUCCESS` on success

## ◆ GetNumOffsets()

virtual int32_t AAX_DMA_API AAX_IDma::GetNumOffsets | ( |  | ) |
| pure virtual

Gets the number of offets in the offset table.

## ◆ SetBaseOffset()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetBaseOffset | ( | int32_t | iBaseOffsetBytes | ) |
| pure virtual

Sets the relative base offset into the FIFO where transfers will begin.

The base offset will be added to each value in the offset table in order to determine the starting offset within the FIFO buffer for each burst.

See also
  AAX_IDma::SetOffsetTable()

Returns
  `AAX_SUCCESS` on success

## ◆ GetBaseOffset()

virtual int32_t AAX_DMA_API AAX_IDma::GetBaseOffset | ( |  | ) |
| pure virtual

Gets the relative base offset into the FIFO where transfers will begin.

## ◆ SetFifoSize()

virtual AAX_Result AAX_DMA_API AAX_IDma::SetFifoSize | ( | int32_t | iSizeBytes | ) |
| pure virtual

Sets the size of the FIFO buffer, in bytes.

Note
  The FIFO buffer must be padded with at least enough memory to accommodate one burst, as defined by SetBurstLength().

Returns
  `AAX_SUCCESS` on success

## ◆ GetFifoSize()

virtual int32_t AAX_DMA_API AAX_IDma::GetFifoSize | ( |  | ) |
| pure virtual

Gets the size of the FIFO buffer, in bytes.

The documentation for this class was generated from the following file:

- AAX_IDma.h