[libcamera-devel] [PATCH v2 2/2] android: Introduce PlatformFrameBufferAllocator
Kieran Bingham
kieran.bingham at ideasonboard.com
Tue Nov 9 11:14:19 CET 2021
Quoting Jacopo Mondi (2021-11-09 08:57:26)
> Hello
>
> On Tue, Nov 09, 2021 at 02:46:14PM +0900, Hirokazu Honda wrote:
> > Hi Kieran,
> >
> > On Tue, Nov 9, 2021 at 8:26 AM Kieran Bingham
> > <kieran.bingham at ideasonboard.com> wrote:
> > >
> > > Quoting Hirokazu Honda (2021-11-01 07:16:52)
> > > > After we unify identical streams to one stream configuration, the
> > > > capture requested by a HAL client can have been resolved as
> > > > CameraStream::Mapped. That is, a buffer to be written by a camera
> > > > is not provided by a client. We would handle this case by
> > > > dynamically allocating FrameBuffer.
> > > >
> > > > The existing FrameBufferAllocator cannot used because it is not
> > > > allowed to allocate a new buffer while Camera is running.
> > > >
> > > > This introduces PlatformFrameBufferAllocator. It allocates
> > > > FrameBuffer using cros::CameraBufferManager on ChromeOS and
> > > > gralloc on non ChromeOS platform. The allocated FrameBuffer owns
> > > > the underlying buffer but must be destroyed before
> > > > PlatformFrameBufferAllocator is destroyed.
> > > >
> > > > Signed-off-by: Hirokazu Honda <hiroh at chromium.org>
> > >
> > > I'm finding this one harder to grasp. It's late so I think I might have
> > > to continue tomorrow.
> > >
> > > I wish we had better infrastructure for unit tests on the Android layer,
> > > as I'm sure some of this would benefit from more tests, but even then
> > > we'd have to have an environment to run the unit tests against the
> > > allocators...
> > >
> > >
> > > > ---
> > > > src/android/frame_buffer_allocator.h | 54 +++++++
> > > > .../mm/cros_frame_buffer_allocator.cpp | 90 +++++++++++
> > > > .../mm/generic_frame_buffer_allocator.cpp | 144 ++++++++++++++++++
> > > > src/android/mm/meson.build | 6 +-
> > > > 4 files changed, 292 insertions(+), 2 deletions(-)
> > > > create mode 100644 src/android/frame_buffer_allocator.h
> > > > create mode 100644 src/android/mm/cros_frame_buffer_allocator.cpp
> > > > create mode 100644 src/android/mm/generic_frame_buffer_allocator.cpp
> > > >
> > > > diff --git a/src/android/frame_buffer_allocator.h b/src/android/frame_buffer_allocator.h
> > > > new file mode 100644
> > > > index 00000000..41ed4ae1
> > > > --- /dev/null
> > > > +++ b/src/android/frame_buffer_allocator.h
> > > > @@ -0,0 +1,54 @@
> > > > +/* SPDX-License-Identifier: LGPL-2.1-or-later */
> > > > +/*
> > > > + * Copyright (C) 2021, Google Inc.
> > > > + *
> > > > + * frame_buffer_allocator.h - Interface definition to allocate Frame buffer in
> > > > + * platform dependent way.
> > > > + */
> > > > +#ifndef __ANDROID_FRAME_BUFFER_ALLOCATOR_H__
> > > > +#define __ANDROID_FRAME_BUFFER_ALLOCATOR_H__
> > > > +
> > > > +#include <memory>
> > > > +
> > > > +#include <libcamera/base/class.h>
> > > > +#include <libcamera/camera.h>
> > > > +#include <libcamera/framebuffer.h>
> > > > +#include <libcamera/geometry.h>
> > > > +
> > > > +class CameraDevice;
> > > > +
> > > > +class PlatformFrameBufferAllocator : libcamera::Extensible
> > >
> > > Does the 'PlatformFrameBufferAllocater' benefit from using Extensible?
> > > Is it required somehow? Can't it just be a normal class that the CrOS
> > > and Android variants inherit from?
> > >
> >
> > I followed CameraBuffer design pattern here.
> > I am fine to make them normal classes.
> > How shall I decide which to be used in run time?
> >
>
> I think compile time selection like it's done for CameraBuffer is
> better and I don't see what benefit would bring removing the Extensible
> pattern.
Aha, that's the part I'd missed last night. Yes this is fine for
Extensible I think.
> Thanks
> j
>
> > -Hiro
> > >
> > > > +{
> > > > + LIBCAMERA_DECLARE_PRIVATE()
> > > > +
> > > > +public:
> > > > + explicit PlatformFrameBufferAllocator(CameraDevice *const cameraDevice);
> > > > + ~PlatformFrameBufferAllocator();
> > > > +
> > > > + /*
> > > > + * FrameBuffer owns the underlying buffer. Returns nullptr on failure.
> > > > + * Note: The returned FrameBuffer needs to be destroyed before
> > > > + * PlatformFrameBufferAllocator is destroyed.
> > > > + */
> > > > + std::unique_ptr<libcamera::FrameBuffer> allocate(
> > > > + int halPixelFormat, const libcamera::Size &size, uint32_t usage);
> > > > +};
> > > > +
> > > > +#define PUBLIC_FRAME_BUFFER_ALLOCATOR_IMPLEMENTATION \
> > > > +PlatformFrameBufferAllocator::PlatformFrameBufferAllocator( \
> > > > + CameraDevice *const cameraDevice) \
> > > > + : Extensible(std::make_unique<Private>(this, cameraDevice)) \
> > > > +{ \
> > > > +} \
> > > > +PlatformFrameBufferAllocator::~PlatformFrameBufferAllocator() \
> > > > +{ \
> > > > +} \
> > > > +std::unique_ptr<libcamera::FrameBuffer> \
> > > > +PlatformFrameBufferAllocator::allocate(int halPixelFormat, \
> > > > + const libcamera::Size& size, \
> > > > + uint32_t usage) \
> > > > +{ \
> > > > + return _d()->allocate(halPixelFormat, size, usage); \
> > > > +}
> > > > +
> > > > +#endif /* __ANDROID_FRAME_BUFFER_ALLOCATOR_H__ */
> > > > diff --git a/src/android/mm/cros_frame_buffer_allocator.cpp b/src/android/mm/cros_frame_buffer_allocator.cpp
> > > > new file mode 100644
> > > > index 00000000..9c7e4ea4
> > > > --- /dev/null
> > > > +++ b/src/android/mm/cros_frame_buffer_allocator.cpp
> > > > @@ -0,0 +1,90 @@
> > > > +/* SPDX-License-Identifier: LGPL-2.1-or-later */
> > > > +/*
> > > > + * Copyright (C) 2021, Google Inc.
> > > > + *
> > > > + * cros_frame_buffer.cpp - Allocate FrameBuffer for Chromium OS using
> > > > + * CameraBufferManager
> > > > + */
> > > > +
> > > > +#include <memory>
> > > > +#include <vector>
> > > > +
> > > > +#include <libcamera/base/log.h>
> > > > +
> > > > +#include "libcamera/internal/framebuffer.h"
> > > > +
> > > > +#include "../camera_device.h"
> > > > +#include "../frame_buffer_allocator.h"
> > > > +#include "cros-camera/camera_buffer_manager.h"
> > > > +
> > > > +using namespace libcamera;
> > > > +
> > > > +LOG_DECLARE_CATEGORY(HAL)
> > > > +
> > > > +namespace {
> > > > +class CrosFrameBufferData : public FrameBuffer::Private
> > > > +{
> > > > + LIBCAMERA_DECLARE_PUBLIC(FrameBuffer)
> > > > +public:
> > > > + CrosFrameBufferData(cros::ScopedBufferHandle scopedHandle)
> > > > + : FrameBuffer::Private(), scopedHandle_(std::move(scopedHandle))
> > > > + {
> > > > + }
> > > > +
> > > > + ~CrosFrameBufferData() override = default;
> > > > +
> > > > +private:
> > > > + cros::ScopedBufferHandle scopedHandle_;
> > > > +};
> > > > +} /* namespace */
> > > > +
> > > > +class PlatformFrameBufferAllocator::Private : public Extensible::Private
> > > > +{
> > > > + LIBCAMERA_DECLARE_PUBLIC(PlatformFrameBufferAllocator)
> > > > +
> > > > +public:
> > > > + Private([[maybe_unused]] PlatformFrameBufferAllocator *allocator,
> > > > + [[maybe_unused]] CameraDevice *const cameraDevice)
> > > > + {
> > > > + }
> > > > +
> > > > + ~Private() override = default;
> > > > +
> > > > + std::unique_ptr<libcamera::FrameBuffer> allocate(
> > > > + int halPixelFormat, const libcamera::Size &size, uint32_t usage);
> > > > +};
> > > > +
> > > > +std::unique_ptr<libcamera::FrameBuffer>
> > > > +PlatformFrameBufferAllocator::Private::allocate(
> > > > + int halPixelFormat, const libcamera::Size &size, uint32_t usage)
> > > > +{
> > > > + cros::ScopedBufferHandle scopedHandle =
> > > > + cros::CameraBufferManager::AllocateScopedBuffer(
> > > > + size.width, size.height, halPixelFormat, usage);
> > > > + if (!scopedHandle) {
> > > > + LOG(HAL, Error) << "Failed to allocate buffer handle";
> > > > + return nullptr;
> > > > + }
> > > > +
> > > > + buffer_handle_t handle = *scopedHandle;
> > > > + const size_t numPlanes = cros::CameraBufferManager::GetNumPlanes(handle);
> > > > + std::vector<FrameBuffer::Plane> planes(numPlanes);
> > > > + FileDescriptor fd{ handle->data[0] };
> > > > + if (!fd.isValid()) {
> > > > + LOG(HAL, Fatal) << "Invalid fd";
> > > > + return nullptr;
> > > > + }
> > > > +
> > > > + /* This code assumes all the planes are located in the same buffer. */
> > > > + for (auto [i, plane] : utils::enumerate(planes)) {
> > > > + plane.fd = fd;
> > > > + plane.offset = cros::CameraBufferManager::GetPlaneOffset(handle, i);
> > > > + plane.length = cros::CameraBufferManager::GetPlaneSize(handle, i);
> > > > + }
> > > > +
> > > > + return std::make_unique<FrameBuffer>(
> > > > + std::make_unique<CrosFrameBufferData>(std::move(scopedHandle)),
> > > > + planes);
> > > > +}
> > > > +
> > > > +PUBLIC_FRAME_BUFFER_ALLOCATOR_IMPLEMENTATION
> > > > diff --git a/src/android/mm/generic_frame_buffer_allocator.cpp b/src/android/mm/generic_frame_buffer_allocator.cpp
> > > > new file mode 100644
> > > > index 00000000..167cc1a5
> > > > --- /dev/null
> > > > +++ b/src/android/mm/generic_frame_buffer_allocator.cpp
> > > > @@ -0,0 +1,144 @@
> > > > +/* SPDX-License-Identifier: LGPL-2.1-or-later */
> > > > +/*
> > > > + * Copyright (C) 2021, Google Inc.
> > > > + *
> > > > + * generic_camera_buffer.cpp - Allocate FrameBuffer using gralloc API
> > > > + */
> > > > +
> > > > +#include <memory>
> > > > +#include <vector>
> > > > +
> > > > +#include <libcamera/base/log.h>
> > > > +
> > > > +#include "libcamera/internal/formats.h"
> > > > +#include "libcamera/internal/framebuffer.h"
> > > > +
> > > > +#include <hardware/camera3.h>
> > > > +#include <hardware/gralloc.h>
> > > > +#include <hardware/hardware.h>
> > > > +
> > > > +#include "../camera_device.h"
> > > > +#include "../frame_buffer_allocator.h"
> > > > +
> > > > +using namespace libcamera;
> > > > +
> > > > +LOG_DECLARE_CATEGORY(HAL)
> > > > +
> > > > +namespace {
> > > > +class GenericFrameBufferData : public FrameBuffer::Private
> > > > +{
> > > > + LIBCAMERA_DECLARE_PUBLIC(FrameBuffer)
> > > > +
> > > > +public:
> > > > + GenericFrameBufferData(struct alloc_device_t *allocDevice,
> > > > + buffer_handle_t handle)
> > > > + : allocDevice_(allocDevice), handle_(handle)
> > > > + {
> > > > + ASSERT(allocDevice_);
> > > > + ASSERT(handle_);
> > > > + }
> > > > +
> > > > + ~GenericFrameBufferData() override
> > > > + {
> > > > + /*
> > > > + * allocDevice_ is used to destroy handle_. allocDevice_ is
> > > > + * owned by PlatformFrameBufferAllocator::Private.
> > > > + * GenericFrameBufferData must be destroyed before it is
> > > > + * destroyed.
> > > > + *
> > > > + * \todo: Consider managing alloc_device_t with std::shared_ptr
> > > > + * if this is difficult to maintain.
> > > > + *
> > > > + * Q: Thread safety against alloc_device_t is not documented.
> > > > + * Is it no problem to call alloc/free in parallel?
> > > > + */
> > > > + ASSERT(allocDevice_);
> > > > + allocDevice_->free(allocDevice_, handle_);
> > > > + }
> > > > +
> > > > +private:
> > > > + struct alloc_device_t *allocDevice_;
> > > > + const buffer_handle_t handle_;
> > > > +};
> > > > +} /* namespace */
> > > > +
> > > > +class PlatformFrameBufferAllocator::Private : public Extensible::Private
> > > > +{
> > > > + LIBCAMERA_DECLARE_PUBLIC(PlatformFrameBufferAllocator)
> > > > +
> > > > +public:
> > > > + Private([[maybe_unused]] PlatformFrameBufferAllocator *allocator,
> > > > + CameraDevice *const cameraDevice)
> > > > + : cameraDevice_(cameraDevice),
> > > > + hardwareModule_(cameraDevice->camera3Device()->common.module),
> > > > + allocDevice_(nullptr)
> > > > + {
> > > > + ASSERT(hardwareModule_);
> > > > + }
> > > > +
> > > > + ~Private() override;
> > > > +
> > > > + std::unique_ptr<libcamera::FrameBuffer> allocate(
> > > > + int halPixelFormat, const libcamera::Size &size, uint32_t usage);
> > > > +
> > > > +private:
> > > > + const CameraDevice *const cameraDevice_;
> > > > + struct hw_module_t *const hardwareModule_;
> > > > + struct alloc_device_t *allocDevice_;
> > > > +};
> > > > +
> > > > +PlatformFrameBufferAllocator::Private::~Private()
> > > > +{
> > > > + if (allocDevice_)
> > > > + gralloc_close(allocDevice_);
> > > > +}
> > > > +
> > > > +std::unique_ptr<libcamera::FrameBuffer>
> > > > +PlatformFrameBufferAllocator::Private::allocate(
> > > > + int halPixelFormat, const libcamera::Size &size, uint32_t usage)
> > > > +{
> > > > + if (!allocDevice_) {
> > > > + int ret = gralloc_open(hardwareModule_, &allocDevice_);
> > > > + if (ret) {
> > > > + LOG(HAL, Fatal) << "gralloc_open() failed: " << ret;
> > > > + return nullptr;
> > > > + }
> > > > + }
> > > > +
> > > > + int stride = 0;
> > > > + buffer_handle_t handle = nullptr;
> > > > + int ret = allocDevice_->alloc(allocDevice_, size.width, size.height,
> > > > + halPixelFormat, usage, &handle, &stride);
> > > > + if (ret) {
> > > > + LOG(HAL, Error) << "failed buffer allocating: " << ret;
> > > > + return nullptr;
> > > > + }
> > > > + if (!handle) {
> > > > + LOG(HAL, Fatal) << "buffer_handle_t is empty on success";
> > > > + return nullptr;
> > > > + }
> > > > +
> > > > + const libcamera::PixelFormat pixelFormat =
> > > > + cameraDevice_->capabilities()->toPixelFormat(halPixelFormat);
> > > > + const auto &info = PixelFormatInfo::info(pixelFormat);
> > > > + const unsigned int numPlanes = info.numPlanes();
> > > > + std::vector<FrameBuffer::Plane> planes(numPlanes);
> > > > +
> > > > + /* This code assumes the planes are mapped consecutively. */
> > > > + FileDescriptor fd{ handle->data[0] };
> > > > + size_t offset = 0;
> > > > + for (auto [i, plane] : utils::enumerate(planes)) {
> > > > + const size_t planeSize = info.planeSize(size.height, i, stride);
> > > > +
> > > > + planes[i].fd = fd;
> > > > + planes[i].offset = offset;
> > > > + planes[i].length = planeSize;
> > > > + offset += planeSize;
> > > > + }
> > > > +
> > > > + return std::make_unique<FrameBuffer>(
> > > > + std::make_unique<GenericFrameBufferData>(allocDevice_, handle),
> > > > + planes);
> > > > +}
> > > > +
> > > > +PUBLIC_FRAME_BUFFER_ALLOCATOR_IMPLEMENTATION
> > > > diff --git a/src/android/mm/meson.build b/src/android/mm/meson.build
> > > > index eeb5cc2e..d40a3b0b 100644
> > > > --- a/src/android/mm/meson.build
> > > > +++ b/src/android/mm/meson.build
> > > > @@ -2,8 +2,10 @@
> > > >
> > > > platform = get_option('android_platform')
> > > > if platform == 'generic'
> > > > - android_hal_sources += files(['generic_camera_buffer.cpp'])
> > > > + android_hal_sources += files(['generic_camera_buffer.cpp',
> > > > + 'generic_frame_buffer_allocator.cpp'])
> > > > elif platform == 'cros'
> > > > - android_hal_sources += files(['cros_camera_buffer.cpp'])
> > > > + android_hal_sources += files(['cros_camera_buffer.cpp',
> > > > + 'cros_frame_buffer_allocator.cpp'])
> > > > android_deps += [dependency('libcros_camera')]
> > > > endif
> > > > --
> > > > 2.33.1.1089.g2158813163f-goog
> > > >
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