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/* Copyright (c) 2019 Stanislaw Halik <sthalik@misaki.pl>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#pragma once
#include "export.hpp"
#include <memory>
#include <vector>
#include <QString>
namespace video
{
struct frame final
{
unsigned char* data = nullptr;
// the `stride' member can have a special value of zero,
// signifying stride equal to width * element size
int width = 0, height = 0, stride = 0, channels = 0, channel_size = 1;
};
} // ns video
namespace video::impl {
using namespace video;
struct camera;
struct OTR_VIDEO_EXPORT camera_
{
camera_();
virtual ~camera_();
virtual std::vector<QString> camera_names() const = 0;
virtual std::unique_ptr<camera> make_camera(const QString& name) = 0;
virtual bool show_dialog(const QString& camera_name) = 0;
virtual bool can_show_dialog(const QString& camera_name) = 0;
};
struct OTR_VIDEO_EXPORT camera
{
struct info final
{
enum : unsigned char { channels_gray = 1, channels_bgr = 3 };
// TODO: expose FOV-based focal length for regular webcams
int width = 0, height = 0, fps = 0;
double fx = 0, fy = 0; // focal length
double P_x = 0, P_y = 0; // principal point
double dist_c[8] {}; // distortion coefficients
bool use_mjpeg = false;
int num_channels = channels_bgr;
};
camera();
virtual ~camera();
[[nodiscard]] virtual bool start(info& args) = 0;
virtual void stop() = 0;
virtual bool is_open() = 0;
virtual std::tuple<const frame&, bool> get_frame() = 0;
[[nodiscard]] virtual bool show_dialog() = 0;
};
OTR_VIDEO_EXPORT
void register_camera(std::unique_ptr<impl::camera_> metadata);
} // ns video::impl
#define OTR_REGISTER_CAMERA3(type, ctr) \
static const char init_ ## ctr = \
(::video::impl::register_camera(std::make_unique<type>()), 0);
#ifdef _MSC_VER
// shared library targets without any symbols break cmake build
# define OTR_REGISTER_CAMERA_IMPL(type) \
extern "C" [[maybe_unused]] __declspec(dllexport) \
void _opentrack_module_video_ ##type (void) {}
# define OTR_REGISTER_CAMERA_IMPL2(type) \
OTR_REGISTER_CAMERA_IMPL(type)
#else
# define OTR_REGISTER_CAMERA_IMPL2(type)
#endif
#define OTR_REGISTER_CAMERA2(type, ctr) \
OTR_REGISTER_CAMERA3(type, ctr) \
OTR_REGISTER_CAMERA_IMPL2(type)
#define OTR_REGISTER_CAMERA(type) \
OTR_REGISTER_CAMERA2(type, __COUNTER__)
namespace video
{
using camera_impl = impl::camera;
OTR_VIDEO_EXPORT std::unique_ptr<camera_impl> make_camera(const QString& name);
OTR_VIDEO_EXPORT std::unique_ptr<camera_impl> make_camera_(const QString& name);
OTR_VIDEO_EXPORT
std::vector<QString> camera_names();
[[nodiscard]]
OTR_VIDEO_EXPORT
bool show_dialog(const QString& camera_name);
} // ns video
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