[PATCH 15 5/7] libcamera: virtual: Add ImageFrameGenerator
Cheng-Hao Yang
chenghaoyang at chromium.org
Tue Oct 22 09:46:01 CEST 2024
Hi Kieran,
On Tue, Oct 22, 2024 at 7:38 AM Kieran Bingham
<kieran.bingham at ideasonboard.com> wrote:
>
> Quoting Harvey Yang (2024-10-04 10:59:18)
> > Besides TestPatternGenerator, this patch adds ImageFrameGenerator that
> > loads real images (jpg / jpeg for now) as the source and generates
> > scaled frames.
> >
> > Signed-off-by: Konami Shu <konamiz at google.com>
> > Co-developed-by: Harvey Yang <chenghaoyang at chromium.org>
> > Co-developed-by: Yunke Cao <yunkec at chromium.org>
> > Co-developed-by: Tomasz Figa <tfiga at chromium.org>
>
> Missing SoB's here are failing checkpatch and will prevent merge.
Done
>
> > Reviewed-by: Jacopo Mondi <jacopo.mondi at ideasonboard.com>
> > ---
> > .../virtual/image_frame_generator.cpp | 179 ++++++++++++++++++
> > .../pipeline/virtual/image_frame_generator.h | 51 +++++
> > src/libcamera/pipeline/virtual/meson.build | 4 +
> > 3 files changed, 234 insertions(+)
> > create mode 100644 src/libcamera/pipeline/virtual/image_frame_generator.cpp
> > create mode 100644 src/libcamera/pipeline/virtual/image_frame_generator.h
> >
> > diff --git a/src/libcamera/pipeline/virtual/image_frame_generator.cpp b/src/libcamera/pipeline/virtual/image_frame_generator.cpp
> > new file mode 100644
> > index 000000000..04382beb7
> > --- /dev/null
> > +++ b/src/libcamera/pipeline/virtual/image_frame_generator.cpp
> > @@ -0,0 +1,179 @@
> > +/* SPDX-License-Identifier: LGPL-2.1-or-later */
> > +/*
> > + * Copyright (C) 2024, Google Inc.
> > + *
> > + * image_frame_generator.cpp - Derived class of FrameGenerator for
>
> Please drop the filename from the header comments of all added files in
> the series.
Done
>
> > + * generating frames from images
> > + */
> > +
> > +#include "image_frame_generator.h"
> > +
> > +#include <string>
> > +
> > +#include <libcamera/base/file.h>
> > +#include <libcamera/base/log.h>
> > +
> > +#include <libcamera/framebuffer.h>
> > +
> > +#include "libcamera/internal/mapped_framebuffer.h"
> > +
> > +#include "libyuv/convert.h"
> > +#include "libyuv/scale.h"
> > +
> > +namespace libcamera {
> > +
> > +LOG_DECLARE_CATEGORY(Virtual)
> > +
> > +/*
> > + * Factory function to create an ImageFrameGenerator object.
> > + * Read the images and convert them to buffers in NV12 format.
> > + * Store the pointers to the buffers to a list (imageFrameDatas)
> > + */
> > +std::unique_ptr<ImageFrameGenerator>
> > +ImageFrameGenerator::create(ImageFrames &imageFrames)
> > +{
> > + std::unique_ptr<ImageFrameGenerator> imageFrameGenerator =
> > + std::make_unique<ImageFrameGenerator>();
> > + imageFrameGenerator->imageFrames_ = &imageFrames;
> > +
> > + /*
> > + * For each file in the directory, load the image,
> > + * convert it to NV12, and store the pointer.
> > + */
> > + for (unsigned int i = 0; i < imageFrames.number.value_or(1); i++) {
> > + std::filesystem::path path;
> > + if (!imageFrames.number)
> > + /* If the path is to an image */
> > + path = imageFrames.path;
> > + else
> > + /* If the path is to a directory */
> > + path = imageFrames.path / (std::to_string(i) + ".jpg");
> > +
> > + File file(path);
> > + if (!file.open(File::OpenModeFlag::ReadOnly)) {
> > + LOG(Virtual, Error) << "Failed to open image file " << file.fileName()
> > + << ": " << strerror(file.error());
> > + return nullptr;
> > + }
> > +
> > + /* Read the image file to data */
> > + auto fileSize = file.size();
> > + auto buffer = std::make_unique<uint8_t[]>(fileSize);
> > + if (file.read({ buffer.get(), static_cast<size_t>(fileSize) }) != fileSize) {
> > + LOG(Virtual, Error) << "Failed to read file " << file.fileName()
> > + << ": " << strerror(file.error());
> > + return nullptr;
> > + }
> > +
> > + /* Get the width and height of the image */
> > + int width, height;
> > + if (libyuv::MJPGSize(buffer.get(), fileSize, &width, &height)) {
> > + LOG(Virtual, Error) << "Failed to get the size of the image file: "
> > + << file.fileName();
> > + return nullptr;
> > + }
> > +
> > + std::unique_ptr<uint8_t[]> dstY =
> > + std::make_unique<uint8_t[]>(width * height);
> > + std::unique_ptr<uint8_t[]> dstUV =
> > + std::make_unique<uint8_t[]>(width * height / 2);
> > + int ret = libyuv::MJPGToNV12(buffer.get(), fileSize,
> > + dstY.get(), width, dstUV.get(),
> > + width, width, height, width, height);
> > + if (ret != 0)
> > + LOG(Virtual, Error) << "MJPGToNV12() failed with " << ret;
> > +
> > + imageFrameGenerator->imageFrameDatas_.emplace_back(
> > + ImageFrameData{ std::move(dstY), std::move(dstUV),
> > + Size(width, height) });
> > + }
> > +
> > + return imageFrameGenerator;
> > +}
> > +
> > +/*
> > + * \var ImageFrameGenerator::frameRepeat
> > + * \brief Number of frames to repeat before proceeding to the next frame
> > + */
> > +
> > +/* Scale the buffers for image frames. */
> > +void ImageFrameGenerator::configure(const Size &size)
> > +{
> > + /* Reset the source images to prevent multiple configuration calls */
> > + scaledFrameDatas_.clear();
> > + frameIndex_ = 0;
> > + parameter_ = 0;
> > +
> > + for (unsigned int i = 0; i < imageFrames_->number.value_or(1); i++) {
> > + /* Scale the imageFrameDatas_ to scaledY and scaledUV */
> > + unsigned int halfSizeWidth = (size.width + 1) / 2;
> > + unsigned int halfSizeHeight = (size.height + 1) / 2;
> > + std::unique_ptr<uint8_t[]> scaledY =
> > + std::make_unique<uint8_t[]>(size.width * size.height);
> > + std::unique_ptr<uint8_t[]> scaledUV =
> > + std::make_unique<uint8_t[]>(halfSizeWidth * halfSizeHeight * 2);
> > + auto &src = imageFrameDatas_[i];
> > +
> > + /*
> > + * \todo Some platforms might enforce stride due to GPU.
> > + * The width needs to be a multiple of the stride to work
> > + * properly for now.
> > + */
> > + libyuv::NV12Scale(src.Y.get(), src.size.width,
> > + src.UV.get(), src.size.width,
> > + src.size.width, src.size.height,
> > + scaledY.get(), size.width, scaledUV.get(), size.width,
> > + size.width, size.height, libyuv::FilterMode::kFilterBilinear);
> > +
> > + scaledFrameDatas_.emplace_back(
> > + ImageFrameData{ std::move(scaledY), std::move(scaledUV), size });
> > + }
> > +}
> > +
> > +int ImageFrameGenerator::generateFrame(const Size &size, const FrameBuffer *buffer)
> > +{
> > + ASSERT(!scaledFrameDatas_.empty());
> > +
> > + MappedFrameBuffer mappedFrameBuffer(buffer, MappedFrameBuffer::MapFlag::Write);
> > +
> > + auto planes = mappedFrameBuffer.planes();
> > +
> > + /* Loop only around the number of images available */
> > + frameIndex_ %= imageFrames_->number.value_or(1);
> > +
> > + /* Write the scaledY and scaledUV to the mapped frame buffer */
> > + libyuv::NV12Copy(scaledFrameDatas_[frameIndex_].Y.get(), size.width,
> > + scaledFrameDatas_[frameIndex_].UV.get(), size.width, planes[0].begin(),
> > + size.width, planes[1].begin(), size.width,
> > + size.width, size.height);
> > +
> > + /* Proceed to the next image every 4 frames */
> > + /* \todo Consider setting the frameRepeat in the config file */
> > + parameter_++;
> > + if (parameter_ % frameRepeat == 0)
> > + frameIndex_++;
> > +
> > + return 0;
> > +}
> > +
> > +/*
> > + * \var ImageFrameGenerator::imageFrameDatas_
> > + * \brief List of pointers to the not scaled image buffers
> > + */
> > +
> > +/*
> > + * \var ImageFrameGenerator::scaledFrameDatas_
> > + * \brief List of pointers to the scaled image buffers
> > + */
> > +
> > +/*
> > + * \var ImageFrameGenerator::imageFrames_
> > + * \brief Pointer to the imageFrames_ in VirtualCameraData
> > + */
> > +
> > +/*
> > + * \var ImageFrameGenerator::parameter_
> > + * \brief Speed parameter. Change to the next image every parameter_ frames
> > + */
> > +
> > +} /* namespace libcamera */
> > diff --git a/src/libcamera/pipeline/virtual/image_frame_generator.h b/src/libcamera/pipeline/virtual/image_frame_generator.h
> > new file mode 100644
> > index 000000000..a68094a66
> > --- /dev/null
> > +++ b/src/libcamera/pipeline/virtual/image_frame_generator.h
> > @@ -0,0 +1,51 @@
> > +/* SPDX-License-Identifier: LGPL-2.1-or-later */
> > +/*
> > + * Copyright (C) 2024, Google Inc.
> > + *
> > + * image_frame_generator.h - Derived class of FrameGenerator for
> > + * generating frames from images
> > + */
> > +
> > +#pragma once
> > +
> > +#include <filesystem>
> > +#include <memory>
> > +#include <optional>
> > +#include <stdint.h>
> > +#include <sys/types.h>
> > +
> > +#include "frame_generator.h"
> > +
> > +namespace libcamera {
> > +
> > +/* Frame configuration provided by the config file */
> > +struct ImageFrames {
> > + std::filesystem::path path;
> > + std::optional<unsigned int> number;
> > +};
> > +
> > +class ImageFrameGenerator : public FrameGenerator
> > +{
> > +public:
> > + static std::unique_ptr<ImageFrameGenerator> create(ImageFrames &imageFrames);
> > +
> > +private:
> > + static constexpr unsigned int frameRepeat = 4;
> > +
> > + struct ImageFrameData {
> > + std::unique_ptr<uint8_t[]> Y;
> > + std::unique_ptr<uint8_t[]> UV;
> > + Size size;
> > + };
> > +
> > + void configure(const Size &size) override;
> > + int generateFrame(const Size &size, const FrameBuffer *buffer) override;
> > +
> > + std::vector<ImageFrameData> imageFrameDatas_;
> > + std::vector<ImageFrameData> scaledFrameDatas_;
> > + ImageFrames *imageFrames_;
> > + unsigned int frameIndex_;
> > + unsigned int parameter_;
> > +};
> > +
> > +} /* namespace libcamera */
> > diff --git a/src/libcamera/pipeline/virtual/meson.build b/src/libcamera/pipeline/virtual/meson.build
> > index 0c537777f..bb38c193c 100644
> > --- a/src/libcamera/pipeline/virtual/meson.build
> > +++ b/src/libcamera/pipeline/virtual/meson.build
> > @@ -1,8 +1,12 @@
> > # SPDX-License-Identifier: CC0-1.0
> >
> > libcamera_internal_sources += files([
> > + 'image_frame_generator.cpp',
> > 'test_pattern_generator.cpp',
> > 'virtual.cpp',
> > ])
> >
> > +libjpeg = dependency('libjpeg', required : true)
> > +
> > libcamera_deps += [libyuv_dep]
> > +libcamera_deps += [libjpeg]
> > --
> > 2.47.0.rc0.187.ge670bccf7e-goog
> >
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