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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021, Google Inc.
*
* generic_camera_buffer.cpp - Generic Android frame buffer backend
*/
#include "../camera_buffer.h"
#include <sys/mman.h>
#include <unistd.h>
#include <libcamera/base/log.h>
#include "libcamera/internal/formats.h"
#include "libcamera/internal/mapped_framebuffer.h"
using namespace libcamera;
LOG_DECLARE_CATEGORY(HAL)
class CameraBuffer::Private : public Extensible::Private,
public libcamera::MappedBuffer
{
LIBCAMERA_DECLARE_PUBLIC(CameraBuffer)
public:
Private(CameraBuffer *cameraBuffer, buffer_handle_t camera3Buffer,
libcamera::PixelFormat pixelFormat, const libcamera::Size &size,
int flags);
~Private();
unsigned int numPlanes() const;
Span<uint8_t> plane(unsigned int plane);
size_t jpegBufferSize(size_t maxJpegBufferSize) const;
private:
/* \todo Remove planes_ when it will be added to MappedBuffer */
std::vector<Span<uint8_t>> planes_;
};
CameraBuffer::Private::Private([[maybe_unused]] CameraBuffer *cameraBuffer,
buffer_handle_t camera3Buffer,
libcamera::PixelFormat pixelFormat,
const libcamera::Size &size, int flags)
{
error_ = 0;
const auto &info = libcamera::PixelFormatInfo::info(pixelFormat);
if (!info.isValid()) {
error_ = -EINVAL;
LOG(HAL, Error) << "Invalid pixel format: "
<< pixelFormat.toString();
return;
}
/*
* As Android doesn't offer an API to query buffer layouts, assume for
* now that the buffer is backed by a single dmabuf, with planes being
* stored contiguously.
*/
int fd = -1;
for (int i = 0; i < camera3Buffer->numFds; i++) {
if (camera3Buffer->data[i] == -1 || camera3Buffer->data[i] == fd)
continue;
if (fd != -1) {
error_ = -EINVAL;
LOG(HAL, Error) << "Discontiguous planes are not supported";
return;
}
fd = camera3Buffer->data[i];
}
if (fd == -1) {
error_ = -EINVAL;
LOG(HAL, Error) << "No valid file descriptor";
return;
}
off_t bufferLength = lseek(fd, 0, SEEK_END);
if (bufferLength < 0) {
error_ = -errno;
LOG(HAL, Error) << "Failed to get buffer length";
return;
}
void *address = mmap(nullptr, bufferLength, flags, MAP_SHARED, fd, 0);
if (address == MAP_FAILED) {
error_ = -errno;
LOG(HAL, Error) << "Failed to mmap plane";
return;
}
maps_.emplace_back(static_cast<uint8_t *>(address), bufferLength);
const unsigned int numPlanes = info.numPlanes();
planes_.resize(numPlanes);
unsigned int offset = 0;
for (unsigned int i = 0; i < numPlanes; ++i) {
/*
* \todo Remove if this plane size computation function is
* added to PixelFormatInfo.
*/
const unsigned int vertSubSample = info.planes[i].verticalSubSampling;
const unsigned int stride = info.stride(size.width, i, 1u);
const unsigned int planeSize =
stride * ((size.height + vertSubSample - 1) / vertSubSample);
planes_[i] = libcamera::Span<uint8_t>(
static_cast<uint8_t *>(address) + offset, planeSize);
if (bufferLength < offset + planeSize) {
error_ = -EINVAL;
LOG(HAL, Error) << "Plane " << i << " is out of buffer"
<< ", buffer length=" << bufferLength
<< ", offset=" << offset
<< ", size=" << planeSize;
return;
}
offset += planeSize;
}
}
CameraBuffer::Private::~Private()
{
}
unsigned int CameraBuffer::Private::numPlanes() const
{
return planes_.size();
}
Span<uint8_t> CameraBuffer::Private::plane(unsigned int plane)
{
if (plane >= planes_.size())
return {};
return planes_[plane];
}
size_t CameraBuffer::Private::jpegBufferSize(size_t maxJpegBufferSize) const
{
return std::min<unsigned int>(maps_[0].size(),
maxJpegBufferSize);
}
PUBLIC_CAMERA_BUFFER_IMPLEMENTATION
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