71ef5532d9
Add a simple event loop to the cam application and use it in the main() function, with an example of how to handle SIGINT to gracefully stop the loop. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
105 lines
2 KiB
C++
105 lines
2 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* main.cpp - cam - The libcamera swiss army knife
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*/
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#include <iostream>
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#include <map>
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#include <signal.h>
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#include <string.h>
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#include <libcamera/libcamera.h>
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#include "event_loop.h"
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#include "options.h"
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using namespace libcamera;
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OptionsParser::Options options;
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enum {
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OptCamera = 'c',
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OptHelp = 'h',
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OptList = 'l',
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};
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EventLoop *loop;
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void signalHandler(int signal)
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{
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std::cout << "Exiting" << std::endl;
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loop->exit();
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}
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static int parseOptions(int argc, char *argv[])
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{
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OptionsParser parser;
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parser.addOption(OptCamera, "Specify which camera to operate on",
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"camera", OptionsParser::ArgumentRequired,
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"camera");
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parser.addOption(OptHelp, "Display this help message", "help");
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parser.addOption(OptList, "List all cameras", "list");
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options = parser.parse(argc, argv);
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if (!options.valid())
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return -EINVAL;
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if (argc == 1 || options.isSet(OptHelp)) {
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parser.usage();
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return 1;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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int ret;
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ret = parseOptions(argc, argv);
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if (ret < 0)
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return EXIT_FAILURE;
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CameraManager *cm = CameraManager::instance();
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ret = cm->start();
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if (ret) {
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std::cout << "Failed to start camera manager: "
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<< strerror(-ret) << std::endl;
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return EXIT_FAILURE;
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}
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if (options.isSet(OptList)) {
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std::cout << "Available cameras:" << std::endl;
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for (const std::shared_ptr<Camera> &camera : cm->cameras())
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std::cout << "- " << camera->name() << std::endl;
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}
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if (options.isSet(OptCamera)) {
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std::shared_ptr<Camera> cam = cm->get(options[OptCamera]);
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if (cam) {
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std::cout << "Using camera " << cam->name() << std::endl;
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} else {
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std::cout << "Camera " << options[OptCamera]
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<< " not found" << std::endl;
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}
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}
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loop = new EventLoop(cm->eventDispatcher());
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struct sigaction sa = {};
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sa.sa_handler = &signalHandler;
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sigaction(SIGINT, &sa, nullptr);
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ret = loop->exec();
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delete loop;
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cm->stop();
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return ret;
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}
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