libcamera/vivid.git - libcamera pipeline handler for VIVID

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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 <libcamera/internal/buffer.h> #include "libcamera/internal/log.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); } CameraBuffer::CameraBuffer(buffer_handle_t camera3Buffer, int flags) : Extensible(new Private(this, camera3Buffer, flags)) { } CameraBuffer::~CameraBuffer() { } bool CameraBuffer::isValid() const { const Private *const d = LIBCAMERA_D_PTR(); return d->isValid(); } unsigned int CameraBuffer::numPlanes() const { const Private *const d = LIBCAMERA_D_PTR(); return d->numPlanes(); } Span<const uint8_t> CameraBuffer::plane(unsigned int plane) const { const Private *const d = LIBCAMERA_D_PTR(); return const_cast<Private *>(d)->plane(plane); } Span<uint8_t> CameraBuffer::plane(unsigned int plane) { Private *const d = LIBCAMERA_D_PTR(); return d->plane(plane); } size_t CameraBuffer::jpegBufferSize(size_t maxJpegBufferSize) const { const Private *const d = LIBCAMERA_D_PTR(); return d->jpegBufferSize(maxJpegBufferSize); }


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