Native_Camera.h

#ifndef OPENCV_NDK_NATIVE_CAMERA_H
#define OPENCV_NDK_NATIVE_CAMERA_H

#include "Util.h"
#include <camera/NdkCameraDevice.h>
#include <camera/NdkCameraManager.h>
#include <media/NdkImageReader.h>
#include <android/native_window.h>

enum camera_type {
    BACK_CAMERA, FRONT_CAMERA
};

// TODO - reasonable actions with callbacks
// Camera Callbacks
static void CameraDeviceOnDisconnected(void *context, ACameraDevice *device) {
    LOGI("Camera(id: %s) is diconnected.\n", ACameraDevice_getId(device));
}

static void CameraDeviceOnError(void *context, ACameraDevice *device,
                                int error) {
    LOGE("Error(code: %d) on Camera(id: %s).\n", error,
         ACameraDevice_getId(device));
}

// Capture Callbacks
static void CaptureSessionOnReady(void *context,
                                  ACameraCaptureSession *session) {
    LOGI("Session is ready.\n");
}

static void CaptureSessionOnActive(void *context,
                                   ACameraCaptureSession *session) {
    LOGI("Session is activated.\n");
}

// This class was created since if you want to alternate cameras
// you need to do a proper cleanup and setup and creating a
// separate class was the best OOP move
class Native_Camera {
public:
    explicit Native_Camera(camera_type type);

    ~Native_Camera();

    bool MatchCaptureSizeRequest(ImageFormat *resView, int32_t width, int32_t height);

    bool CreateCaptureSession(ANativeWindow *window);

    int32_t GetCameraCount() { return m_camera_id_list->numCameras; }

    uint32_t GetOrientation() { return m_camera_orientation; };

private:

    // Camera variables
    ACameraDevice *m_camera_device;
    ACaptureRequest *m_capture_request;
    ACameraOutputTarget *m_camera_output_target;
    ACaptureSessionOutput *m_session_output;
    ACaptureSessionOutputContainer *m_capture_session_output_container;
    ACameraCaptureSession *m_capture_session;

    ACameraDevice_StateCallbacks m_device_state_callbacks;
    ACameraCaptureSession_stateCallbacks m_capture_session_state_callbacks;

    ACameraManager *m_camera_manager;
    uint32_t m_camera_orientation;
    ACameraIdList *m_camera_id_list = NULL;
    const char *m_selected_camera_id = NULL;
    bool m_camera_ready;

    int32_t backup_width = 480;
    int32_t backup_height = 720;
};

#endif //OPENCV_NDK_NATIVE_CAMERA_H