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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Raspberry Pi Ltd
*
* Helper class for dma-buf allocations.
*/
#pragma once
#include <memory>
#include <string>
#include <vector>
#include <libcamera/base/flags.h>
#include <libcamera/base/shared_fd.h>
#include <libcamera/base/unique_fd.h>
namespace libcamera {
class FrameBuffer;
class DmaBufAllocator
{
public:
enum class DmaBufAllocatorFlag {
CmaHeap = 1 << 0,
SystemHeap = 1 << 1,
UDmaBuf = 1 << 2,
};
using DmaBufAllocatorFlags = Flags<DmaBufAllocatorFlag>;
DmaBufAllocator(DmaBufAllocatorFlags flags = DmaBufAllocatorFlag::CmaHeap);
~DmaBufAllocator();
bool isValid() const { return providerHandle_.isValid(); }
UniqueFD alloc(const char *name, std::size_t size);
int exportBuffers(unsigned int count,
const std::vector<unsigned int> &planeSizes,
std::vector<std::unique_ptr<FrameBuffer>> *buffers);
private:
std::unique_ptr<FrameBuffer> createBuffer(
std::string name, const std::vector<unsigned int> &planeSizes);
UniqueFD allocFromHeap(const char *name, std::size_t size);
UniqueFD allocFromUDmaBuf(const char *name, std::size_t size);
UniqueFD providerHandle_;
DmaBufAllocatorFlag type_;
};
class DmaSyncer final
{
public:
enum class SyncType {
Read = 0,
Write,
ReadWrite,
};
explicit DmaSyncer(SharedFD fd, SyncType type = SyncType::ReadWrite);
~DmaSyncer();
private:
void sync(uint64_t step);
SharedFD fd_;
uint64_t flags_ = 0;
};
LIBCAMERA_FLAGS_ENABLE_OPERATORS(DmaBufAllocator::DmaBufAllocatorFlag)
} /* namespace libcamera */
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