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authorJacopo Mondi <jacopo@jmondi.org>2019-07-10 12:07:19 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2019-07-14 16:01:03 +0300
commitf1199a1011a22f00e863473ae241c781f4bd999d (patch)
tree1201339db3d65fcd5d8ad9718c063b3abea5910e /src/qcam
parent99e1e786b475f3d6f4f8d9f5cd21db6c524ba60f (diff)
libcamera: buffer: Add dmabuf file descriptors
In addition to referencing buffer memory by index, add support to referencing it using dmabuf file descriptors. This will be used to reference buffer memory allocated outside of libcamera and import it. The dmabuf file descriptors are stored in an array in the Buffer class, and a new Stream::createBuffer() overload is added to construct a buffer from dmabuf file descriptor. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Diffstat (limited to 'src/qcam')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-23 07:35:40 +0000
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * capture.cpp - Cam capture
 */

#include <iomanip>
#include <iostream>
#include <limits.h>
#include <sstream>

#include "capture.h"
#include "main.h"

using namespace libcamera;

Capture::Capture(std::shared_ptr<Camera> camera, CameraConfiguration *config,
		 EventLoop *loop)
	: camera_(camera), config_(config), writer_(nullptr), last_(0), loop_(loop),
	  captureCount_(0), captureLimit_(0)
{
}

int Capture::run(const OptionsParser::Options &options)
{
	int ret;

	captureCount_ = 0;
	captureLimit_ = options[OptCapture].toInteger();

	if (!camera_) {
		std::cout << "Can't capture without a camera" << std::endl;
		return -ENODEV;
	}

	ret = camera_->configure(config_);
	if (ret < 0) {
		std::cout << "Failed to configure camera" << std::endl;
		return ret;
	}

	streamName_.clear();
	for (unsigned int index = 0; index < config_->size(); ++index) {
		StreamConfiguration &cfg = config_->at(index);
		streamName_[cfg.stream()] = "stream" + std::to_string(index);
	}

	camera_->requestCompleted.connect(this, &Capture::requestComplete);

	if (options.isSet(OptFile)) {
		if (!options[OptFile].toString().empty())
			writer_ = new BufferWriter(options[OptFile]);
		else
			writer_ = new BufferWriter();
	}


	FrameBufferAllocator *allocator = new FrameBufferAllocator(camera_);

	ret = capture(allocator);

	if (options.isSet(OptFile)) {
		delete writer_;
		writer_ = nullptr;
	}

	requests_.clear();

	delete allocator;

	return ret;
}

int Capture::capture(FrameBufferAllocator *allocator)
{
	int ret;

	/* Identify the stream with the least number of buffers. */
	unsigned int nbuffers = UINT_MAX;
	for (StreamConfiguration &cfg : *config_) {
		ret = allocator->allocate(cfg.stream());
		if (ret < 0) {
			std::cerr << "Can't allocate buffers" << std::endl;
			return -ENOMEM;
		}

		unsigned int allocated = allocator->buffers(cfg.stream()).size();
		nbuffers = std::min(nbuffers, allocated);
	}

	/*
	 * TODO: make cam tool smarter to support still capture by for
	 * example pushing a button. For now run all streams all the time.
	 */

	for (unsigned int i = 0; i < nbuffers; i++) {
		std::unique_ptr<Request> request = camera_->createRequest();
		if (!request) {
			std::cerr << "Can't create request" << std::endl;
			return -ENOMEM;
		}

		for (StreamConfiguration &cfg : *config_) {
			Stream *stream = cfg.stream();
			const std::vector<std::unique_ptr<FrameBuffer>> &buffers =
				allocator->buffers(stream);
			const std::unique_ptr<FrameBuffer> &buffer = buffers[i];

			ret = request->addBuffer(stream, buffer.get());
			if (ret < 0) {
				std::cerr << "Can't set buffer for request"
					  << std::endl;
				return ret;
			}

			if (writer_)
				writer_->mapBuffer(buffer.get());
		}

		requests_.push_back(std::move(request));
	}

	ret = camera_->start();
	if (ret) {
		std::cout << "Failed to start capture" << std::endl;
		return ret;
	}

	for (std::unique_ptr<Request> &request : requests_) {
		ret = camera_->queueRequest(request.get());
		if (ret < 0) {
			std::cerr << "Can't queue request" << std::endl;
			camera_->stop();
			return ret;
		}
	}

	if (captureLimit_)
		std::cout << "Capture " << captureLimit_ << " frames" << std::endl;
	else
		std::cout << "Capture until user interrupts by SIGINT" << std::endl;

	ret = loop_->exec();
	if (ret)
		std::cout << "Failed to run capture loop" << std::endl;

	ret = camera_->stop();
	if (ret)
		std::cout << "Failed to stop capture" << std::endl;

	return ret;
}

void Capture::requestComplete(Request *request)
{
	if (request->status() == Request::RequestCancelled)
		return;

	const Request::BufferMap &buffers = request->buffers();

	/*
	 * Compute the frame rate. The timestamp is arbitrarily retrieved from
	 * the first buffer, as all buffers should have matching timestamps.
	 */
	uint64_t ts = buffers.begin()->second->metadata().timestamp;
	double fps = ts - last_;
	fps = last_ != 0 && fps ? 1000000000.0 / fps : 0.0;
	last_ = ts;

	std::stringstream info;
	info << ts / 1000000000 << "."
	     << std::setw(6) << std::setfill('0') << ts / 1000 % 1000000
	     << " (" << std::fixed << std::setprecision(2) << fps << " fps)";

	for (auto it = buffers.begin(); it != buffers.end(); ++it) {
		const Stream *stream = it->first;
		FrameBuffer *buffer = it->second;
		const std::string &name = streamName_[stream];

		const FrameMetadata &metadata = buffer->metadata();

		info << " " << name
		     << " seq: " << std::setw(6) << std::setfill('0') << metadata.sequence
		     << " bytesused: ";

		unsigned int nplane = 0;
		for (const FrameMetadata::Plane &plane : metadata.planes) {
			info << plane.bytesused;
			if (++nplane < metadata.planes.size())
				info << "/";
		}

		if (writer_)
			writer_->write(buffer, name);
	}

	std::cout << info.str() << std::endl;

	captureCount_++;
	if (captureLimit_ && captureCount_ >= captureLimit_) {
		loop_->exit(0);
		return;
	}

	request->reuse(Request::ReuseBuffers);
	camera_->queueRequest(request);
}