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authorNiklas Söderlund <niklas.soderlund@ragnatech.se>2019-11-22 17:31:08 +0100
committerNiklas Söderlund <niklas.soderlund@ragnatech.se>2020-01-12 16:10:37 +0100
commitdea689e1f260b904697a9c2f3d05b7b5068d85e1 (patch)
tree3f4af3e375e64a7e54c4a044e0620679f7fe1032 /src/android/camera_device.h
parent13724144f9bfd22f79d56431061bc55a887c1d10 (diff)
libcamera: request: In addBuffer() do not fetch stream from Buffer
In the FrameBuffer interface the stream will not be available from the buffer object as the buffer might be allocated externally. The application needs to explicitly state which stream the buffer is being added for to the request. Extend the addBuffer() function to get this information explicitly from the caller. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'src/android/camera_device.h')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-21 07:02:32 +0000
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2020, Google Inc.
 *
 * camera_stream.cpp - Camera HAL stream
 */

#include "camera_stream.h"

#include <errno.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/poll.h>
#include <unistd.h>

#include <libcamera/formats.h>

#include "jpeg/post_processor_jpeg.h"
#include "yuv/post_processor_yuv.h"

#include "camera_buffer.h"
#include "camera_capabilities.h"
#include "camera_device.h"
#include "camera_metadata.h"
#include "frame_buffer_allocator.h"
#include "post_processor.h"

using namespace libcamera;

LOG_DECLARE_CATEGORY(HAL)

/*
 * \class CameraStream
 * \brief Map a camera3_stream_t to a StreamConfiguration
 *
 * The CameraStream class maps a camera3_stream_t provided by Android
 * camera framework to a libcamera::StreamConfiguration.
 *
 * The StreamConfiguration is represented by its index as recorded in the
 * CameraConfiguration and not by pointer as StreamConfiguration is subject to
 * relocation.
 *
 * A single StreamConfiguration may be used to deliver one or more streams to
 * the Android framework. The mapping type between a camera3 stream to a
 * StreamConfiguration is described by the CameraStream::Type.
 *
 * CameraStream handles all the aspects of producing a stream with the size
 * and format requested by the camera3 stream from the data produced by
 * the associated libcamera::Stream, including the creation of the encoder
 * and buffer allocation.
 */

CameraStream::CameraStream(CameraDevice *const cameraDevice,
			   CameraConfiguration *config, Type type,
			   camera3_stream_t *camera3Stream, unsigned int index)
	: cameraDevice_(cameraDevice), config_(config), type_(type),
	  camera3Stream_(camera3Stream), index_(index)
{
}

CameraStream::CameraStream(CameraStream &&other) = default;

CameraStream::~CameraStream()
{
	/*
	 * Manually delete buffers and then the allocator to make sure buffers
	 * are released while the allocator is still valid.
	 */
	allocatedBuffers_.clear();
	allocator_.reset();
}

const StreamConfiguration &CameraStream::configuration() const
{
	return config_->at(index_);
}

Stream *CameraStream::stream() const
{
	return configuration().stream();
}

int CameraStream::configure()
{
	if (type_ == Type::Internal || type_ == Type::Mapped) {
		const PixelFormat outFormat =
			cameraDevice_->capabilities()->toPixelFormat(camera3Stream_->format);
		StreamConfiguration output = configuration();
		output.pixelFormat = outFormat;
		output.size.width = camera3Stream_->width;
		output.size.height = camera3Stream_->height;

		switch (outFormat) {
		case formats::NV12:
			postProcessor_ = std::make_unique<PostProcessorYuv>();
			break;

		case formats::MJPEG:
			postProcessor_ = std::make_unique<PostProcessorJpeg>(cameraDevice_);
			break;

		default:
			LOG(HAL, Error) << "Unsupported format: " << outFormat;
			return -EINVAL;
		}

		int ret = postProcessor_->configure(configuration(), output);
		if (ret)
			return ret;

		worker_ = std::make_unique<PostProcessorWorker>(postProcessor_.get());
		postProcessor_->processComplete.connect(
			this, [&](Camera3RequestDescriptor::StreamBuffer *streamBuffer,
				  PostProcessor::Status status) {
				Camera3RequestDescriptor::Status bufferStatus;

				if (status == PostProcessor::Status::Success)
					bufferStatus = Camera3RequestDescriptor::Status::Success;
				else
					bufferStatus = Camera3RequestDescriptor::Status::Error;

				cameraDevice_->streamProcessingComplete(streamBuffer,
									bufferStatus);
			});

		worker_->start();
	}

	if (type_ == Type::Internal) {
		allocator_ = std::make_unique<PlatformFrameBufferAllocator>(cameraDevice_);
		mutex_ = std::make_unique<Mutex>();
	}

	camera3Stream_->max_buffers = configuration().bufferCount;

	return 0;
}

int CameraStream::waitFence(int fence)
{
	/*
	 * \todo The implementation here is copied from camera_worker.cpp
	 * and both should be removed once libcamera is instrumented to handle
	 * fences waiting in the core.
	 *
	 * \todo Better characterize the timeout. Currently equal to the one
	 * used by the Rockchip Camera HAL on ChromeOS.
	 */
	constexpr unsigned int timeoutMs = 300;
	struct pollfd fds = { fence, POLLIN, 0 };

	do {
		int ret = poll(&fds, 1, timeoutMs);
		if (ret == 0)
			return -ETIME;

		if (ret > 0) {
			if (fds.revents & (POLLERR | POLLNVAL))
				return -EINVAL;

			return 0;
		}
	} while (errno == EINTR || errno == EAGAIN);

	return -errno;
}

int CameraStream::process(Camera3RequestDescriptor::StreamBuffer *streamBuffer)
{
	ASSERT(type_ != Type::Direct);

	/* Handle waiting on fences on the destination buffer. */
	if (streamBuffer->fence.isValid()) {
		int ret = waitFence(streamBuffer->fence.get());
		if (ret < 0) {
			LOG(HAL, Error) << "Failed waiting for fence: "
					<< streamBuffer->fence.get() << ": "
					<< strerror(-ret);
			return ret;
		}

		streamBuffer->fence.reset();
	}

	const StreamConfiguration &output = configuration();
	streamBuffer->dstBuffer = std::make_unique<CameraBuffer>(
		*streamBuffer->camera3Buffer, output.pixelFormat, output.size,
		PROT_READ | PROT_WRITE);
	if (!streamBuffer->dstBuffer->isValid()) {
		LOG(HAL, Error) << "Failed to create destination buffer";
		return -EINVAL;
	}

	worker_->queueRequest(streamBuffer);

	return 0;
}

void CameraStream::flush()
{
	if (!postProcessor_)
		return;

	worker_->flush();
}

FrameBuffer *CameraStream::getBuffer()
{
	if (!allocator_)
		return nullptr;

	MutexLocker locker(*mutex_);

	if (buffers_.empty()) {
		/*
		 * Use HAL_PIXEL_FORMAT_YCBCR_420_888 unconditionally.
		 *
		 * YCBCR_420 is the source format for both the JPEG and the YUV
		 * post-processors.
		 *
		 * \todo Store a reference to the format of the source stream
		 * instead of hardcoding.
		 */
		auto frameBuffer = allocator_->allocate(HAL_PIXEL_FORMAT_YCBCR_420_888,
							configuration().size,
							camera3Stream_->usage);
		allocatedBuffers_.push_back(std::move(frameBuffer));
		buffers_.emplace_back(allocatedBuffers_.back().get());
	}

	FrameBuffer *buffer = buffers_.back();
	buffers_.pop_back();

	return buffer;
}

void CameraStream::putBuffer(FrameBuffer *buffer)
{
	if (!allocator_)
		return;

	MutexLocker locker(*mutex_);

	buffers_.push_back(buffer);
}

/**
 * \class CameraStream::PostProcessorWorker
 * \brief Post-process a CameraStream in an internal thread
 *
 * If the association between CameraStream and camera3_stream_t dictated by
 * CameraStream::Type is internal or mapped, the stream is generated by post
 * processing of a libcamera stream. Such a request is queued to a
 * PostProcessorWorker in CameraStream::process(). A queue of post-processing
 * requests is maintained by the PostProcessorWorker and it will run the
 * post-processing on an internal thread as soon as any request is available on
 * its queue.
 */
CameraStream::PostProcessorWorker::PostProcessorWorker(PostProcessor *postProcessor)
	: postProcessor_(postProcessor)
{
}

CameraStream::PostProcessorWorker::~PostProcessorWorker()
{
	{
		MutexLocker lock(mutex_);
		state_ = State::Stopped;
	}

	cv_.notify_one();
	wait();
}

void CameraStream::PostProcessorWorker::start()
{
	{
		MutexLocker lock(mutex_);
		ASSERT(state_ != State::Running);
		state_ = State::Running;
	}

	Thread::start();
}

void CameraStream::PostProcessorWorker::queueRequest(Camera3RequestDescriptor::StreamBuffer *dest)
{
	{
		MutexLocker lock(mutex_);
		ASSERT(state_ == State::Running);
		requests_.push(dest);
	}

	cv_.notify_one();
}

void CameraStream::PostProcessorWorker::run()
{
	MutexLocker locker(mutex_);

	while (1) {
		cv_.wait(locker, [&]() LIBCAMERA_TSA_REQUIRES(mutex_) {
			return state_ != State::Running || !requests_.empty();
		});

		if (state_ != State::Running)
			break;

		Camera3RequestDescriptor::StreamBuffer *streamBuffer = requests_.front();
		requests_.pop();
		locker.unlock();

		postProcessor_->process(streamBuffer);

		locker.lock();
	}

	if (state_ == State::Flushing) {
		std::queue<Camera3RequestDescriptor::StreamBuffer *> requests =
			std::move(requests_);
		locker.unlock();

		while (!requests.empty()) {
			postProcessor_->processComplete.emit(
				requests.front(), PostProcessor::Status::Error);
			requests.pop();
		}

		locker.lock();
		state_ = State::Stopped;
	}
}