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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021, Google Inc.
*
* cros_camera_buffer.cpp - Chromium OS buffer backend using CameraBufferManager
*/
#include "../camera_buffer.h"
#include <libcamera/base/log.h>
#include "cros-camera/camera_buffer_manager.h"
using namespace libcamera;
LOG_DECLARE_CATEGORY(HAL)
class CameraBuffer::Private : public Extensible::Private
{
LIBCAMERA_DECLARE_PUBLIC(CameraBuffer)
public:
Private(CameraBuffer *cameraBuffer, buffer_handle_t camera3Buffer,
PixelFormat pixelFormat, const Size &size,
int flags);
~Private();
bool isValid() const { return registered_; }
unsigned int numPlanes() const;
Span<uint8_t> plane(unsigned int plane);
unsigned int stride(unsigned int plane) const;
unsigned int offset(unsigned int plane) const;
unsigned int size(unsigned int plane) const;
size_t jpegBufferSize(size_t maxJpegBufferSize) const;
private:
void map();
cros::CameraBufferManager *bufferManager_;
buffer_handle_t handle_;
unsigned int numPlanes_;
bool mapped_;
bool registered_;
union {
void *addr;
android_ycbcr ycbcr;
} mem;
};
CameraBuffer::Private::Private([[maybe_unused]] CameraBuffer *cameraBuffer,
buffer_handle_t camera3Buffer,
[[maybe_unused]] PixelFormat pixelFormat,
[[maybe_unused]] const Size &size,
[[maybe_unused]] int flags)
: handle_(camera3Buffer), numPlanes_(0), mapped_(false),
registered_(false)
{
bufferManager_ = cros::CameraBufferManager::GetInstance();
int ret = bufferManager_->Register(camera3Buffer);
if (ret) {
LOG(HAL, Error) << "Failed registering a buffer: " << ret;
return;
}
registered_ = true;
numPlanes_ = bufferManager_->GetNumPlanes(camera3Buffer);
}
CameraBuffer::Private::~Private()
{
int ret;
if (mapped_) {
ret = bufferManager_->Unlock(handle_);
if (ret != 0)
LOG(HAL, Error) << "Failed to unlock buffer: "
<< strerror(-ret);
}
if (registered_) {
ret = bufferManager_->Deregister(handle_);
if (ret != 0)
LOG(HAL, Error) << "Failed to deregister buffer: "
<< strerror(-ret);
}
}
unsigned int CameraBuffer::Private::numPlanes() const
{
return bufferManager_->GetNumPlanes(handle_);
}
Span<uint8_t> CameraBuffer::Private::plane(unsigned int plane)
{
if (!mapped_)
map();
if (!mapped_)
return {};
void *addr;
switch (numPlanes()) {
case 1:
addr = mem.addr;
break;
default:
switch (plane) {
case 0:
addr = mem.ycbcr.y;
break;
case 1:
addr = mem.ycbcr.cb;
break;
case 2:
addr = mem.ycbcr.cr;
break;
}
}
return { static_cast<uint8_t *>(addr),
bufferManager_->GetPlaneSize(handle_, plane) };
}
unsigned int CameraBuffer::Private::stride(unsigned int plane) const
{
return cros::CameraBufferManager::GetPlaneStride(handle_, plane);
}
unsigned int CameraBuffer::Private::offset(unsigned int plane) const
{
return cros::CameraBufferManager::GetPlaneOffset(handle_, plane);
}
unsigned int CameraBuffer::Private::size(unsigned int plane) const
{
return cros::CameraBufferManager::GetPlaneSize(handle_, plane);
}
size_t CameraBuffer::Private::jpegBufferSize([[maybe_unused]] size_t maxJpegBufferSize) const
{
return bufferManager_->GetPlaneSize(handle_, 0);
}
void CameraBuffer::Private::map()
{
int ret;
switch (numPlanes_) {
case 1: {
ret = bufferManager_->Lock(handle_, 0, 0, 0, 0, 0, &mem.addr);
if (ret) {
LOG(HAL, Error) << "Single plane buffer mapping failed";
return;
}
break;
}
case 2:
case 3: {
ret = bufferManager_->LockYCbCr(handle_, 0, 0, 0, 0, 0,
&mem.ycbcr);
if (ret) {
LOG(HAL, Error) << "YCbCr buffer mapping failed";
return;
}
break;
}
default:
LOG(HAL, Error) << "Invalid number of planes: " << numPlanes_;
return;
}
mapped_ = true;
return;
}
PUBLIC_CAMERA_BUFFER_IMPLEMENTATION
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