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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021, Google Inc.
*
* cros_frame_buffer.cpp - Allocate FrameBuffer for Chromium OS using
* CameraBufferManager
*/
#include <memory>
#include <vector>
#include <libcamera/base/log.h>
#include <libcamera/base/shared_fd.h>
#include "libcamera/internal/framebuffer.h"
#include "../camera_device.h"
#include "../frame_buffer_allocator.h"
#include "cros-camera/camera_buffer_manager.h"
using namespace libcamera;
LOG_DECLARE_CATEGORY(HAL)
namespace {
class CrosFrameBufferData : public FrameBuffer::Private
{
LIBCAMERA_DECLARE_PUBLIC(FrameBuffer)
public:
CrosFrameBufferData(cros::ScopedBufferHandle scopedHandle)
: FrameBuffer::Private(), scopedHandle_(std::move(scopedHandle))
{
}
private:
cros::ScopedBufferHandle scopedHandle_;
};
} /* namespace */
class PlatformFrameBufferAllocator::Private : public Extensible::Private
{
LIBCAMERA_DECLARE_PUBLIC(PlatformFrameBufferAllocator)
public:
Private([[maybe_unused]] CameraDevice *const cameraDevice)
{
}
std::unique_ptr<libcamera::FrameBuffer>
allocate(int halPixelFormat, const libcamera::Size &size, uint32_t usage);
};
std::unique_ptr<libcamera::FrameBuffer>
PlatformFrameBufferAllocator::Private::allocate(int halPixelFormat,
const libcamera::Size &size,
uint32_t usage)
{
cros::ScopedBufferHandle scopedHandle =
cros::CameraBufferManager::AllocateScopedBuffer(
size.width, size.height, halPixelFormat, usage);
if (!scopedHandle) {
LOG(HAL, Error) << "Failed to allocate buffer handle";
return nullptr;
}
buffer_handle_t handle = *scopedHandle;
SharedFD fd{ handle->data[0] };
if (!fd.isValid()) {
LOG(HAL, Fatal) << "Invalid fd";
return nullptr;
}
/* This code assumes all the planes are located in the same buffer. */
const size_t numPlanes = cros::CameraBufferManager::GetNumPlanes(handle);
std::vector<FrameBuffer::Plane> planes(numPlanes);
for (auto [i, plane] : utils::enumerate(planes)) {
plane.fd = fd;
plane.offset = cros::CameraBufferManager::GetPlaneOffset(handle, i);
plane.length = cros::CameraBufferManager::GetPlaneSize(handle, i);
}
return std::make_unique<FrameBuffer>(
std::make_unique<CrosFrameBufferData>(std::move(scopedHandle)),
planes);
}
PUBLIC_FRAME_BUFFER_ALLOCATOR_IMPLEMENTATION
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