libcamera::DmaSyncer Class Reference

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

Public Types
enum	SyncType { SyncType::Read = 0, SyncType::Write, SyncType::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. More...

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 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()

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

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

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