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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* main.cpp - cam - The libcamera swiss army knife
*/
#include <iostream>
#include <signal.h>
#include <string.h>
#include <libcamera/libcamera.h>
#include "capture.h"
#include "event_loop.h"
#include "main.h"
#include "options.h"
using namespace libcamera;
class CamApp
{
public:
CamApp();
static CamApp *instance();
int init(int argc, char **argv);
void cleanup();
int exec();
void quit();
private:
int parseOptions(int argc, char *argv[]);
int run();
static CamApp *app_;
OptionsParser::Options options_;
CameraManager *cm_;
std::shared_ptr<Camera> camera_;
EventLoop *loop_;
};
CamApp *CamApp::app_ = nullptr;
CamApp::CamApp()
: cm_(nullptr), camera_(nullptr), loop_(nullptr)
{
CamApp::app_ = this;
}
CamApp *CamApp::instance()
{
return CamApp::app_;
}
int CamApp::init(int argc, char **argv)
{
int ret;
ret = parseOptions(argc, argv);
if (ret < 0)
return ret;
cm_ = CameraManager::instance();
ret = cm_->start();
if (ret) {
std::cout << "Failed to start camera manager: "
<< strerror(-ret) << std::endl;
return ret;
}
if (options_.isSet(OptCamera)) {
const std::string &cameraName = options_[OptCamera];
char *endptr;
unsigned long index = strtoul(cameraName.c_str(), &endptr, 10);
if (*endptr == '\0' && index > 0 && index <= cm_->cameras().size())
camera_ = cm_->cameras()[index - 1];
else
camera_ = cm_->get(cameraName);
if (!camera_) {
std::cout << "Camera "
<< std::string(options_[OptCamera])
<< " not found" << std::endl;
cm_->stop();
return -ENODEV;
}
if (camera_->acquire()) {
std::cout << "Failed to acquire camera" << std::endl;
camera_.reset();
cm_->stop();
return -EINVAL;
}
std::cout << "Using camera " << camera_->name() << std::endl;
}
loop_ = new EventLoop(cm_->eventDispatcher());
return 0;
}
void CamApp::cleanup()
{
delete loop_;
loop_ = nullptr;
if (camera_) {
camera_->release();
camera_.reset();
}
cm_->stop();
}
int CamApp::exec()
{
int ret;
ret = run();
cleanup();
return ret;
}
void CamApp::quit()
{
if (loop_)
loop_->exit();
}
int CamApp::parseOptions(int argc, char *argv[])
{
KeyValueParser streamKeyValue;
streamKeyValue.addOption("role", OptionString,
"Role for the stream (viewfinder, video, still)",
ArgumentRequired);
streamKeyValue.addOption("width", OptionInteger, "Width in pixels",
ArgumentRequired);
streamKeyValue.addOption("height", OptionInteger, "Height in pixels",
ArgumentRequired);
streamKeyValue.addOption("pixelformat", OptionInteger, "Pixel format",
ArgumentRequired);
OptionsParser parser;
parser.addOption(OptCamera, OptionString,
"Specify which camera to operate on, by name or by index", "camera",
ArgumentRequired, "camera");
parser.addOption(OptCapture, OptionNone,
"Capture until interrupted by user", "capture");
parser.addOption(OptFile, OptionString,
"Write captured frames to disk\n"
"The first '#' character in the file name is expanded to the stream name and frame sequence number.\n"
"The default file name is 'frame-#.bin'.",
"file", ArgumentOptional, "filename");
parser.addOption(OptStream, &streamKeyValue,
"Set configuration of a camera stream", "stream", true);
parser.addOption(OptHelp, OptionNone, "Display this help message",
"help");
parser.addOption(OptList, OptionNone, "List all cameras", "list");
options_ = parser.parse(argc, argv);
if (!options_.valid())
return -EINVAL;
if (options_.empty() || options_.isSet(OptHelp)) {
parser.usage();
return options_.empty() ? -EINVAL : -EINTR;
}
return 0;
}
int CamApp::run()
{
if (options_.isSet(OptList)) {
std::cout << "Available cameras:" << std::endl;
unsigned int index = 1;
for (const std::shared_ptr<Camera> &cam : cm_->cameras()) {
std::cout << index << ": " << cam->name() << std::endl;
index++;
}
}
if (options_.isSet(OptCapture)) {
Capture capture(camera_.get());
return capture.run(loop_, options_);
}
return 0;
}
void signalHandler(int signal)
{
std::cout << "Exiting" << std::endl;
CamApp::instance()->quit();
}
int main(int argc, char **argv)
{
CamApp app;
int ret;
ret = app.init(argc, argv);
if (ret)
return ret == -EINTR ? 0 : EXIT_FAILURE;
struct sigaction sa = {};
sa.sa_handler = &signalHandler;
sigaction(SIGINT, &sa, nullptr);
if (app.exec())
return EXIT_FAILURE;
return 0;
}
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