libcamera: libcamera::DmaSyncer Class Reference

libcamera v0.7.2 Supporting cameras in Linux since 2019

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libcamera::DmaSyncer Class Referencefinal

Helper class for dma-buf's synchronization. More...

## Public Types
enum class | SyncType { Read = 0 , Write , ReadWrite }
| Read and/or write access via the CPU map. More...

## Public Member Functions
| DmaSyncer (SharedFD fd, SyncType type=SyncType::ReadWrite)
| Construct a DmaSyncer with a dma-buf's fd and the access type.
| DmaSyncer (DmaSyncer &&other)=default
| Enable move on class DmaSyncer.
DmaSyncer & | operator= (DmaSyncer &&other)=default
| Enable move on class DmaSyncer.

## Detailed Description

Helper class for dma-buf's synchronization.

This class wraps a userspace dma-buf's synchronization process with an object's lifetime.

It's used when the user needs to access a dma-buf with CPU, mostly mapped with MappedFrameBuffer, so that the buffer is synchronized between CPU and ISP.

## Member Enumeration Documentation

## ◆ SyncType

enum class libcamera::DmaSyncer::SyncType
| strong

Read and/or write access via the CPU map.

Enumerator
Read | Indicates that the mapped dma-buf will be read by the client via the CPU map.
Write | Indicates that the mapped dm-buf will be written by the client via the CPU map.
ReadWrite | Indicates that the mapped dma-buf will be read and written by the client via the CPU map.

## Constructor & Destructor Documentation

## ◆ DmaSyncer() [1/2]

libcamera::DmaSyncer::DmaSyncer | ( | SharedFD | fd,
|  | SyncType | type = SyncType::ReadWrite )
| explicit

Construct a DmaSyncer with a dma-buf's fd and the access type.

Parameters

  [in] | fd | The dma-buf's file descriptor to synchronize
  [in] | type | Read and/or write access via the CPU map

## ◆ DmaSyncer() [2/2]

libcamera::DmaSyncer::DmaSyncer | ( | DmaSyncer && | other | ) |
| default

Enable move on class DmaSyncer.

Parameters

  [in] | other | The other instance

## Member Function Documentation

## ◆ operator=()

DmaSyncer & libcamera::DmaSyncer::operator= | ( | DmaSyncer && | other | ) |
| default

Enable move on class DmaSyncer.

Parameters

  [in] | other | The other instance

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

- include/libcamera/internal/dma_buf_allocator.h
- src/libcamera/dma_buf_allocator.cpp