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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 <unistd.h>
#include <libcamera/base/log.h>
#include "libcamera/internal/buffer.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, int flags);
~Private();
unsigned int numPlanes() const;
Span<uint8_t> plane(unsigned int plane);
size_t jpegBufferSize(size_t maxJpegBufferSize) const;
};
CameraBuffer::Private::Private(CameraBuffer *cameraBuffer,
buffer_handle_t camera3Buffer, int flags)
: Extensible::Private(cameraBuffer)
{
maps_.reserve(camera3Buffer->numFds);
error_ = 0;
for (int i = 0; i < camera3Buffer->numFds; i++) {
if (camera3Buffer->data[i] == -1)
continue;
off_t length = lseek(camera3Buffer->data[i], 0, SEEK_END);
if (length < 0) {
error_ = -errno;
LOG(HAL, Error) << "Failed to query plane length";
break;
}
void *address = mmap(nullptr, length, flags, MAP_SHARED,
camera3Buffer->data[i], 0);
if (address == MAP_FAILED) {
error_ = -errno;
LOG(HAL, Error) << "Failed to mmap plane";
break;
}
maps_.emplace_back(static_cast<uint8_t *>(address),
static_cast<size_t>(length));
}
}
CameraBuffer::Private::~Private()
{
}
unsigned int CameraBuffer::Private::numPlanes() const
{
return maps_.size();
}
Span<uint8_t> CameraBuffer::Private::plane(unsigned int plane)
{
if (plane >= maps_.size())
return {};
return maps_[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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