ALiveVideo.h

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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 
#ifndef META_OCEAN_MEDIA_ANDROID_A_LIVE_VIDEO_H
#define META_OCEAN_MEDIA_ANDROID_A_LIVE_VIDEO_H
 
#include "ocean/media/android/Android.h"
#include "ocean/media/android/AMedium.h"
#include "ocean/media/android/NativeCameraLibrary.h"
#include "ocean/media/android/NativeMediaLibrary.h"
 
#include "ocean/base/Value.h"
 
#include "ocean/math/AnyCamera.h"
 
#include "ocean/media/LiveVideo.h"
 
#include <jni.h>
 
namespace Ocean
{
 
namespace Media
{
 
namespace Android
{
 
#ifdef OCEAN_MEDIA_ANDROID_NATIVECAMERALIBRARY_AVAILABLE
 
/**
 * This class implements an live video class for Android.
 * @ingroup mediaandroid
 */
class OCEAN_MEDIA_A_EXPORT ALiveVideo final :
    virtual public AMedium,
    virtual public LiveVideo
{
    friend class ALibrary;
    friend class ALiveVideoManager;
 
    public:
 
        /**
         * This class holds the relevant information of a selectable live video device.
         */
        class Device
        {
            friend class ALiveVideo;
 
            public:
 
                /// Definition of an unordered map mapping metadata tags to their values.
                using MetadataMap = std::unordered_map<uint32_t, Value>;
 
            public:
 
                /**
                 * Default constructor.
                 */
                Device() = default;
 
                /**
                 * Returns the device's id.
                 * @return The id of the device
                 */
                inline const std::string& id() const;
 
                /**
                 * Returns the device's name.
                 * @return The name of the device
                 */
                inline const std::string& name() const;
 
                /**
                 * Returns the device's direction.
                 * @return The direction of the device
                 */
                inline acamera_metadata_enum_android_lens_facing_t lensFacing() const;
 
                /**
                 * Returns the optional metadata map of the device.
                 * @return The optional metadata map of the device
                 */
                inline const MetadataMap& metadataMap() const;
 
                /**
                 * Returns whether this object is valid.
                 * @return True, if so
                 */
                inline bool isValid() const;
 
                /**
                 * Returns the readable string for a lens facing type.
                 * @param lensFacing The lens facing type to return the readable string for
                 * @return The readable string for the given lens facing type
                 */
                static std::string readableLensFacing(const acamera_metadata_enum_android_lens_facing_t lensFacing);
 
            protected:
 
                /**
                 * Creates a new device object.
                 * @param id The id of the device, must be valid
                 * @param name The human redable name of the device, must be valid
                 * @param lensFacing The direction of the device
                 * @param metadataMap The optional metadata map of the device
                 */
                inline Device(const std::string& id, const std::string& name_, const acamera_metadata_enum_android_lens_facing_t lensFacing, MetadataMap&& metadataMap = MetadataMap());
 
            protected:
 
                /// The device's id.
                std::string id_;
 
                /// The device's human readable name.
                std::string name_;
 
                /// The device's direction.
                acamera_metadata_enum_android_lens_facing_t lensFacing_ = acamera_metadata_enum_acamera_lens_facing(-1);
 
                /// The optional metadata map of the device.
                MetadataMap metadataMap_;
        };
 
        using Devices = std::vector<Device>;
 
    private:
 
        /**
         * Definition of Android image formats that are missing from the NDK
         * These values are used but they are missing from the NDK header, media/NdkImage.h.
         * @see https://developer.android.com/reference/kotlin/android/graphics/ImageFormat
         */
        enum AIMAGE_FORMATS_MISSING_FROM_NDK : int32_t
        {
            // Android YUV P010 format.
            AIMAGE_FORMAT_YCBCR_P010 = 54,
        };
 
    public:
 
        /**
         * Returns whether the medium is started currently.
         * @see Medium::isStarted().
         */
        bool isStarted() const override;
 
        /**
         * Returns the start timestamp.
         * @see FiniteMedium::startTimestamp().
         */
        Timestamp startTimestamp() const override;
 
        /**
         * Returns the pause timestamp.
         * @see FiniteMedium::pauseTimestamp().
         */
        Timestamp pauseTimestamp() const override;
 
        /**
         * Returns the stop timestamp.
         * @see FiniteMedium::stopTimestamp().
         */
        Timestamp stopTimestamp() const override;
 
        /**
         * Returns the transformation between the camera and device.
         * @see FrameMedium::device_T_camera().
         */
        HomogenousMatrixD4 device_T_camera() const override;
 
        /**
         * Returns the supported stream types.
         * @see LiveVideo::supportedStreamTypes().
         */
        StreamTypes supportedStreamTypes() const override;
 
        /**
         * Returns the supported stream configurations for a given stream type.
         * @see LiveVideo::supportedStreamConfigurations().
         */
        StreamConfigurations supportedStreamConfigurations(const StreamType streamType = ST_INVALID) const override;
 
        /**
         * Returns the current exposure duration of this device.
         * @see exposureDuration().
         */
        double exposureDuration(double* minDuration = nullptr, double* maxDuration = nullptr, ControlMode* exposureMode = nullptr) const override;
 
        /**
         * Returns the current ISO of this device.
         * @see iso().
         */
        float iso(float* minISO = nullptr, float* maxISO = nullptr, ControlMode* isoMode = nullptr) const override;
 
        /**
         * Returns the current focus of this device.
         * @see LiveVideo::focus().
         */
        float focus(ControlMode* focusMode = nullptr) const override;
 
        /**
         * Sets the preferred stream type.
         * @see LiveVideo::setPreferredStreamConfiguration().
         */
        bool setPreferredStreamType(const StreamType streamType) override;
 
        /**
         * Sets the preferred stream configuration.
         * @see LiveVideo::setPreferredStreamConfiguration().
         */
        bool setPreferredStreamConfiguration(const StreamConfiguration& streamConfiguration) override;
 
        /**
         * Sets the exposure duration of this device.
         * Note: 'allowShorterExposure' is ignored
         * @see setExposureDuration().
         */
        bool setExposureDuration(const double duration, const bool allowShorterExposure = false) override;
 
        /**
         * Sets the ISO of this device.
         * @see setISO().
         */
        bool setISO(const float iso) override;
 
        /**
         * Sets the focus of this device.
         * @see setFocus().
         */
        bool setFocus(const float position) override;
 
        /**
         * Explicitly feeds a new external frame this live video.
         * This function is intended for situations in which this live video does not receive the frame anymore from the system (e.g., when ARCore is accessing the video stream).<br>
         * Do not call this function in case the live video is still receiving pixel buffers from the Android media system.
         * @param frame The frame to be fed, must be valid
         * @param anyCamera The camera profile defining the projection, must be valid
         * @param exposureMode The exposure mode of the camera, CM_INVALID if unknown
         * @param exposureDuration The exposure duration of the camera, in seconds, -1 if unknown
         * @param isoMode The ISO mode of the camera, CM_INVALID if unknown
         * @param iso The ISO of the camera, -1 if unknown
         * @param focusMode The focus mode of the camera, CM_INVALID if unknown
         * @param focusValue The focus value of the camera, in the same domain as ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE, -1 if unknown
         */
        void feedNewFrame(Frame&& frame, SharedAnyCamera&& anyCamera, const ControlMode exposureMode, const double exposureDuration, const ControlMode isoMode, const float iso, const ControlMode focusMode, const float focusValue);
 
        /**
         * Forces a restart of the live video for situations in which the camera was used by an external resource.
         * This function is intended for situations in which e.g., ARCore has used the borrowed the camera resource but does not use it anymore.
         * Do not call this function in case the live video is still receiving pixel buffers from the Android media system.
         * @return True, if succeeded
         */
        bool forceRestart();
 
        /**
         * Returns the list of currently selectable devices.
         * @return The list of currently selectable devices
         */
        static Devices selectableDevices();
 
    protected:
 
        /**
         * Creates a new medium by a given url.
         * @param url Url of the medium
         * @param id Optional unique id of the medium
         */
        explicit ALiveVideo(const std::string& url, const std::string& id);
 
        /**
         * Destructs the live video object.
         */
        ~ALiveVideo() override;
 
        /**
         * Starts the medium.
         * @see Medium::start().
         */
        bool start() override;
 
        /**
         * Pauses the medium.
         * @see Medium::pause():
         */
        bool pause() override;
 
        /**
         * Stops the medium.
         * @see Medium::stop().
         */
        bool stop() override;
 
        /**
         * Initializes the camera and all corresponding resources.
         * @return True, if succeeded
         */
        bool initialize();
 
        /**
         * Releases the camera and all corresponding resources.
         * @return True, if succeeded
         */
        bool release();
 
        /**
         * Creates an Android camera for the URL of this medium.
         * @param frameType The resulting frame type matching with the Android camera
         * @return True, if succeeded
         */
        bool createCamera(FrameType& frameType);
 
        /**
         * Releases the Android camera.
         * @return True, if succeeded
         */
        bool releaseCamera();
 
        /**
         * Creates a new image reader based on a given frame type, needs a valid camera.
         * @param frameType The frame type of the image reader, must be valid
         * @return True, if succeeded
         */
        bool createImageReader(const FrameType& frameType);
 
        /**
         * Releases the image reader.
         */
        void releaseImageReader();
 
        /**
         * Creates a new capture session, needs a valid camera and image reader.
         * @return True, if succeeded
         */
        bool createCaptureSession();
 
        /**
         * Releases the capture session.
         */
        void releaseCaptureSession();
 
        /**
         * The callback function for camera images.
         * @param imageReader The image reader of the event, must be valid
         * @see onCameraImageCallbackStatic().
         */
        void onCameraImageCallback(AImageReader* imageReader);
 
        /**
         * The callback function for a disconnected camera.
         * @param cameraDevice The camera device of the event, must be valid
         * @see onCameraDisconnectedStatic().
         */
        void onCameraDisconnected(ACameraDevice* cameraDevice);
 
        /**
         * The callback function for errors.
         * @param cameraDevice The camera device of the event, must be valid
         * @param error The error value of the event
         * @see onCameraErrorStatic().
         */
        void onCameraError(ACameraDevice* cameraDevice, int error);
 
        /**
         * The callback function for an active session.
         * @param session The session, must be valid
         */
        void onSessionActive(ACameraCaptureSession* session);
 
        /**
         * The callback function for a closed session.
         * @param session The session, must be valid
         */
        void onSessionClosed(ACameraCaptureSession* session);
 
        /**
         * The callback function for a started capture.
         * @param session The session, must be valid
         * @param request The capture request, must be valid
         * @param timestamp The capture results, must be valid
         */
        void onCaptureStarted(ACameraCaptureSession* session, const ACaptureRequest* request, int64_t timestamp);
 
        /**
         * The callback function for a completed capture.
         * @param session The session, must be valid
         * @param request The capture request, must be valid
         * @param result The capture results, must be valid
         */
        void onCaptureCompleted(ACameraCaptureSession* session, ACaptureRequest* request, const ACameraMetadata* result);
 
        /**
         * Event function for new camera frames.
         * @param frame The new camera frame, must be valid
         * @param anyCamera The camera profile defining the projection, invalid if unknown
         * @return True, if succeeded
         */
        bool onNewFrame(Frame&& frame, SharedAnyCamera&& anyCamera);
 
        /**
         * Determines the camera id and associated frame type for a given URL.
         * @param cameraManager The camera manager from which the camera id will be determined, must be valid
         * @param url The URL for which the camera id will be determined
         * @param id Optional known id of the camera, if provided the camera id will be verified again
         * @param preferredFrameType The preferred frame type (may contain a valid image dimension, or just a pixel format), can be invalid
         * @param frameType The resulting frame type matching with the resulting id
         * @param streamConfigurations Optional resulting stream configurations
         * @param device_T_camera Optional resulting transformation between camera and device
         * @return The resulting id of the camera
         */
        static std::string cameraIdForMedium(ACameraManager* cameraManager, const std::string& url, const std::string& id, const FrameType& preferredFrameType, FrameType& frameType, StreamConfigurations* streamConfigurations = nullptr, HomogenousMatrixD4* device_T_camera = nullptr);
 
        /**
         * Determines the camera id and associated frame type for a given URL or/and id.
         * @param cameraIdList The camera id list from which the camera id will be determined, must be valid
         * @param url The URL for which the camera id will be determined
         * @param id Optional known id of the camera, if provided the camera id will be verified again
         * @return The resulting id of the camera, empty if no camera could be found
         */
        static std::string cameraIdForMedium(ACameraIdList* cameraIdList, const std::string& url, const std::string& id);
 
        /**
         * Determines the range of the exposure duration of the camera sensor.
         * @param cameraManager The camera manager, must be valid
         * @param cameraId The id of the camera, must be valid
         * @param minExposureDuration The minimal exposure duration, in seconds
         * @param maxExposureDuration The maximal exposure duration, in seconds
         * @return True, if succeeded
         */
        static bool cameraExposureDurationRange(ACameraManager* cameraManager, const std::string& cameraId, double& minExposureDuration, double& maxExposureDuration);
 
        /**
         * Determines the range of the ISO of the camera sensor.
         * @param cameraManager The camera manager, must be valid
         * @param cameraId The id of the camera, must be valid
         * @param minISO The minimal ISO
         * @param maxISO The maximal ISO
         * @return True, if succeeded
         */
        static bool cameraISORange(ACameraManager* cameraManager, const std::string& cameraId, float& minISO, float& maxISO);
 
        /**
         * Determines the minimal focus distance of the camera sensor.
         * @param cameraManager The camera manager, must be valid
         * @param cameraId The id of the camera, must be valid
         * @param minFocusPosition The minimal focus distance, which is the reciprocal of the focus distance in meters
         * @return True, if succeeded
         */
        static bool cameraMinFocus(ACameraManager* cameraManager, const std::string& cameraId, float& minFocusPosition);
 
        /**
         * Determines the physical size of the camera sensor.
         * @param cameraManager The camera manager, must be valid
         * @param cameraId The id of the camera, must be valid
         * @param cameraSensorPhysicalSizeX Resulting horizontal physical size of the sensor
         * @return True, if succeeded
         */
        static bool cameraSensorPysicalSize(ACameraManager* cameraManager, const std::string& cameraId, float& cameraSensorPhysicalSizeX);
 
        /**
         * Determines the horizontal field of view from the camera's metadata based on `ACAMERA_LENS_FOCAL_LENGTH`.
         * @param cameraSensorPhysicalSizeX The horizontal physical size of camera sensor, as provided by `ACAMERA_SENSOR_INFO_PHYSICAL_SIZE`.
         * @param cameraMetadata The camera's metadata for a recent frame, must be valid
         * @param fovX The resulting horizontal field of view of the camera, in radian
         * @return True, if succeeded
         */
        static bool horizontalFieldOfView(const float cameraSensorPhysicalSizeX, const ACameraMetadata* cameraMetadata, float& fovX);
 
        /**
         * Extracts the next frame from an Android image object.
         * @param image The Android image object from which the next frame will be extracted
         * @param frame The resulting frame containing the extracted image
         * @return True, if succeeded
         */
        static bool frameFromImage(AImage* image, Frame& frame);
 
        /**
         * Returns the transformation between camera and device (device_T_camera).
         * @param cameraMetadata The camera metadata from which the transformation will be determined, must be valid
         * @return The camera transformation with default camera pointing towards the negative z-space with y-axis upwards; invalid if the transformation could not be determined
         */
        static HomogenousMatrixD4 determineCameraTransformation(ACameraMetadata* cameraMetadata);
 
        /**
         * Translates an Android pixel format to an Ocean pixel format.
         * @param androidFormat The Android pixel format to translate
         * @return The corresponding Ocean pixel format, FORMAT_UNDEFINED if no corresponding Ocean pixel format exists
         */
        static FrameType::PixelFormat androidFormatToPixelFormat(const int32_t androidFormat);
 
        /**
         * Translates Android formats to readable strings.
         * @param androidFormat The Android pixel format to translate
         * @return The corresponding readable string of the Android format
         */
        static std::string androidFormatToString(const int32_t androidFormat);
 
        /**
         * Translates an Ocean pixel format to an Android pixel format.
         * @param pixelFormat The Ocean pixel format to translate
         * @return The corresponding Android pixel format, 0 if no corresponding Android pixel format exists
         */
        static int32_t pixelFormatToAndroidFormat(const FrameType::PixelFormat pixelFormat);
 
        /**
         * Determines the available stream configurations for the camera metadata from a camera.
         * @param cameraMetadata The camera metadata from which the stream configurations will be determined, must be valid
         * @return The resulting stream configurations
         */
        static StreamConfigurations determineAvailableStreamConfigurations(const ACameraMetadata* cameraMetadata);
 
        /**
         * The static callback function for camera images.
         * @param context The event's context, must be valid
         * @param imageReader The image reader of the event, must be valid
         * @see onCameraImageCallback().
         */
        static void onCameraImageCallbackStatic(void* context, AImageReader* imageReader);
 
        /**
         * The static callback function for a disconnected camera.
         * @param context The event's context, must be valid
         * @param cameraDevice The camera device of the event, must be valid
         * @see onCameraDisconnected().
         */
        static void onCameraDisconnectedStatic(void* context, ACameraDevice* cameraDevice);
 
        /**
         * The static callback function for errors.
         * @param context The event's context, must be valid
         * @param cameraDevice The camera device of the event, must be valid
         * @param error The error value of the event
         * @see onCameraError().
         */
        static void onCameraErrorStatic(void* context, ACameraDevice* cameraDevice, int error);
 
        /**
         * The static callback function for an active session.
         * @param context The event's context, must be valid
         * @param session The session, must be valid
         */
        static void onSessionActiveStatic(void* context, ACameraCaptureSession* session);
 
        /**
         * The static callback function for a ready session.
         * @param context The event's context, must be valid
         * @param session The session, must be valid
         */
        static void onSessionReadyStatic(void* context, ACameraCaptureSession* session);
 
        /**
         * The static callback function for a closed session.
         * @param context The event's context, must be valid
         * @param session The session, must be valid
         */
        static void onSessionClosedStatic(void* context, ACameraCaptureSession* session);
 
        /**
         * The static callback function for a failed capture.
         * @param context The event's context, must be valid
         * @param session The session, must be valid
         * @param request The capture request, must be valid
         * @param failure The failure, must be valid
         */
        static void onCaptureFailedStatic(void* context, ACameraCaptureSession* session, ACaptureRequest* request, ACameraCaptureFailure* failure);
 
        /**
         * The static callback function for a completed capture sequence.
         * @param context The event's context, must be valid
         * @param session The session, must be valid
         * @param sequenceId The sequence id
         * @param frameNumber The number of frames
         */
        static void onCaptureSequenceCompletedStatic(void* context, ACameraCaptureSession* session, int sequenceId, int64_t frameNumber);
 
        /**
         * The static callback function for an aborted sequence.
         * @param context The event's context, must be valid
         * @param session The session, must be valid
         * @param sequenceId The sequence id
         */
        static void onCaptureSequenceAbortedStatic(void* context, ACameraCaptureSession* session, int sequenceId);
 
        /**
         * The static callback function for a started capture.
         * @param context The event's context, must be valid
         * @param session The session, must be valid
         * @param request The capture request, must be valid
         * @param timestamp The capture timestamp
         */
        static void onCaptureStartedStatic(void *context, ACameraCaptureSession *session, const ACaptureRequest *request, int64_t timestamp);
 
        /**
         * The static callback function for a completed capture.
         * @param context The event's context, must be valid
         * @param session The session, must be valid
         * @param request The capture request, must be valid
         * @param result The capture results, must be valid
         */
        static void onCaptureCompletedStatic(void* context, ACameraCaptureSession* session, ACaptureRequest* request, const ACameraMetadata* result);
 
        /**
         * Translates a camera status to a readable strings.
         * @param cameraStatus The camera status
         * @return The readable camera status.
         */
        static std::string translateCameraStatus(const camera_status_t cameraStatus);
 
    protected:
 
        /// Unique camera id defined by Android, may be valid even if 'cameraDevice_' is not yet valid.
        std::string cameraId_;
 
        /// The camera device.
        ACameraDevice* cameraDevice_ = nullptr;
 
        /// The image reader.
        AImageReader* imageReader_ = nullptr;
 
        /// The native Android window associated with the video.
        ANativeWindow* nativeWindow_ = nullptr;
 
        /// The session output.
        NativeCameraLibrary::ScopedACaptureSessionOutput sessionOutput_;
 
        /// The session output container.
        NativeCameraLibrary::ScopedACaptureSessionOutputContainer sessionOutputContainer_;
 
        /// The capture session.
        ACameraCaptureSession* captureSession_ = nullptr;
 
        /// The capture request.
        ACaptureRequest* captureRequest_ = nullptr;
 
        /// The output target.
        ACameraOutputTarget* outputTarget_ = nullptr;
 
        /// The horizontal size of the physical camera sensor, if known; -1 if unknown.
        float cameraSensorPhysicalSizeX_ = -1.0f;
 
        /// The transformation between camera and device, with default camera pointing towards the negative z-space with y-axis up.
        HomogenousMatrixD4 device_T_camera_ = HomogenousMatrixD4(false);
 
        /// The current exposure mode of this device.
        ControlMode exposureMode_ = CM_INVALID;
 
        /// The current exposure duration of this device.
        double exposureDuration_ = -1.0;
 
        /// Minimal duration to set, in seconds, with range (0, infinity), -1 if unknown.
        double exposureDurationMin_ = -1.0;
 
        /// Maximal duration to set, in seconds, with range [exposureDurationMin_, infinity), -1 if unknown
        double exposureDurationMax_ = -1.0;
 
        /// The current ISO mode of this device.
        ControlMode isoMode_ = CM_INVALID;
 
        /// The current ISO, with range [isoMin_, isoMax_], 0 for auto IOS, -1 if unknown.
        float iso_ = -1.0f;
 
        /// Minimal ISO to set, with range (0, infinity), -1 if unknown.
        float isoMin_ = -1.0f;
 
        /// Maximal ISO to set, with range (isoMin_, infinity), -1 if unknown.
        float isoMax_ = -1.0f;
 
        /// The current focus mode of this device.
        ControlMode focusMode_ = CM_INVALID;
 
        /// The focus position to be set, with range [0, 1] with 0 shortest distance and 1 furthest distance, -1 if unknown.
        float focusPosition_ = -1.0f;
 
        /// The minimal focus distance (reciprocal of the focus distance in meters), -1 if unknown.
        float focusPositionMin_ = -1.0f;
 
        /// The stream configurations available for this camera.
        StreamConfigurations availableStreamConfigurations_;
 
        /// Start timestamp.
        Timestamp startTimestamp_;
 
        /// Pause timestamp.
        Timestamp pauseTimestamp_;
 
        /// Stop timestamp.
        Timestamp stopTimestamp_;
};
 
inline ALiveVideo::Device::Device(const std::string& id, const std::string& name, const acamera_metadata_enum_android_lens_facing_t lensFacing, MetadataMap&& metadataMap) :
    id_(id),
    name_(name),
    lensFacing_(lensFacing),
    metadataMap_(std::move(metadataMap))
{
    ocean_assert(!id_.empty());
    ocean_assert(!name_.empty());
}
 
inline const std::string& ALiveVideo::Device::id() const
{
    return id_;
}
 
inline const std::string& ALiveVideo::Device::name() const
{
    return name_;
}
 
inline acamera_metadata_enum_android_lens_facing_t ALiveVideo::Device::lensFacing() const
{
    return lensFacing_;
}
 
inline const ALiveVideo::Device::MetadataMap& ALiveVideo::Device::metadataMap() const
{
    return metadataMap_;
}
 
inline bool ALiveVideo::Device::isValid() const
{
    return !id_.empty();
}
 
#else // OCEAN_MEDIA_ANDROID_NATIVECAMERALIBRARY_AVAILABLE
 
/**
 * Java native interface function for new camera framebuffer events.
 * @param env JNI environment object
 * @param javaThis JNI caller object
 * @param objectId Id of the camera object
 * @param imageBuffer New camera image buffer
 * @param width The width of the new camera image buffer in pixel
 * @param height The height of the new camera image buffer in pixel
 * @param format The format of the camera image buffer
 * @param fovX Horizontal field of view in radian
 * @param bufferSize The size of the given image buffer in bytes
 * @param timestamp Unix timestamp of the frame in seconds (time since 1970)
 * @return True, if succeeded
 * @ingroup mediaandroid
 */
extern "C" jboolean Java_com_meta_ocean_media_android_MediaAndroidJni_onNewCameraFrame(JNIEnv* env, jobject javaThis, jint objectId, jbyteArray imageBuffer, jint width, jint height, jint format, jfloat fovX, jint bufferSize, jdouble timestamp);
 
/**
 * This class implements an live video class for Android.
 * @ingroup mediaandroid
 */
class OCEAN_MEDIA_A_EXPORT ALiveVideo final :
    virtual public AMedium,
    virtual public LiveVideo
{
    friend class ALibrary;
    friend class ALiveVideoManager;
 
    public:
 
        /**
         * This class implements a camera manager.
         */
        class ALiveVideoManager : public Singleton<ALiveVideoManager>
        {
            friend class Singleton<ALiveVideoManager>;
            friend class ALiveVideo;
 
            private:
 
                /**
                 * Definition of a map mapping camera id to ocean camera objects.
                 */
                typedef std::map<int, ALiveVideo*> ObjectMap;
 
            public:
 
                /**
                 * Event function for a new camera frame.
                 * @param cameraId Id of the camera the new frame belongs to
                 * @param frame The new camera frame, must be valid
                 * @param anyCamera The camera profile defining the projection, can be invalid
                 * @return True, if succeeded
                 */
                bool onNewFrame(const int cameraId, Frame&& frame, SharedAnyCamera&& anyCamera);
 
            private:
 
                /**
                 * Creates a new camera manager.
                 */
                ALiveVideoManager();
 
                /**
                 * Destructs a camera manager.
                 */
                virtual ~ALiveVideoManager();
 
                /**
                 * Creates a new camera object.
                 * @param object Ocean video object to connect with the android camera object
                 * @param url The camera url to create the object for
                 * @param preferredWidth Preferred frame width in pixel
                 * @param preferredHeight Preferred frame height in pixel
                 * @param preferredFrequency Preferred frame frequency in Hz
                 * @return Unique camera id if succeeded, -1 otherwise
                 */
                int createCamera(ALiveVideo* object, const std::string& url, const unsigned int preferredWidth, const unsigned int preferredHeight, const float preferredFrequency);
 
                /**
                 * Releases a camera object.
                 * @param cameraId Unique camera id of the camera to be released
                 */
                void releaseCamera(const int cameraId);
 
                /**
                 * Starts a specified camera object.
                 * @param cameraId Id of the camera to be started
                 * @return True, if succeeded
                 */
                bool startCamera(const int cameraId);
 
                /**
                 * Pauses a specified camera object.
                 * @param cameraId Id of the camera to be paused
                 * @return True, if succeeded
                 */
                bool pauseCamera(const int cameraId);
 
                /**
                 * Stops a specified camera object.
                 * @param cameraId Id of the camera to be stopped
                 * @return True, if succeeded
                 */
                bool stopCamera(const int cameraId);
 
            private:
 
                /// The camera object map.
                ObjectMap managerObjectMap;
 
                /// Manager lock.
                Lock managerLock;
        };
 
        /**
         * Returns whether the medium is started currently.
         * @see Medium::isStarted().
         */
        bool isStarted() const override;
 
        /**
         * Returns the start timestamp.
         * @see FiniteMedium::startTimestamp().
         */
        Timestamp startTimestamp() const override;
 
        /**
         * Returns the pause timestamp.
         * @see FiniteMedium::pauseTimestamp().
         */
        Timestamp pauseTimestamp() const override;
 
        /**
         * Returns the stop timestamp.
         * @see FiniteMedium::stopTimestamp().
         */
        Timestamp stopTimestamp() const override;
 
        /**
         * Returns the transformation between the camera and device.
         * @see FrameMedium::device_T_camera().
         */
        HomogenousMatrixD4 device_T_camera() const override;
 
        /**
         * Explicitly feeds a new external frame this live video.
         * This function is intended for situations in which this live video does not receive the frame anymore from the system (e.g., when ARCore is accessing the video stream).<br>
         * Do not call this function in case the live video is still receiving pixel buffers from the Android media system.
         * @param frame The frame to be fed, must be valid
         * @param anyCamera The camera profile defining the projection, must be valid
         * @param exposureMode The exposure mode of the camera, CM_INVALID if unknown
         * @param exposureDuration The exposure duration of the camera, in seconds, -1 if unknown
         * @param isoMode The ISO mode of the camera, CM_INVALID if unknown
         * @param iso The ISO of the camera, -1 if unknown
         * @param focusMode The focus mode of the camera, CM_INVALID if unknown
         * @param focusValue The focus value of the camera, in the same domain as ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE, -1 if unknown
         */
        void feedNewFrame(Frame&& frame, SharedAnyCamera&& anyCamera, const ControlMode exposureMode, const double exposureDuration, const ControlMode isoMode, const float iso, const ControlMode focusMode, const float focusValue);
 
 
        /**
         * Forces a restart of the live video for situations in which the camera was used by an external resource.
         * This function is intended for situations in which e.g., ARCore has used the borrowed the camera resource but does not use it anymore.
         * Do not call this function in case the live video is still receiving pixel buffers from the Android media system.
         * @return True, if succeeded
         */
        bool forceRestart();
 
    protected:
 
        /**
         * Creates a new medium by a given url.
         * @param url Url of the medium
         */
        explicit ALiveVideo(const std::string& url);
 
        /**
         * Destructs the live video object.
         */
        ~ALiveVideo() override;
 
        /**
         * Starts the medium.
         * @see Medium::start().
         */
        bool start() override;
 
        /**
         * Pauses the medium.
         * @see Medium::pause():
         */
        bool pause() override;
 
        /**
         * Stops the medium.
         * @see Medium::stop().
         */
        bool stop() override;
 
        /**
         * Event function for new camera frames.
         * @param frame The new camera frame, must be valid
         * @param anyCamera The camera profile defining the projection, invalid if unknown
         * @return True, if succeeded
         */
        bool onNewFrame(Frame&& frame, SharedAnyCamera&& anyCamera);
 
    protected:
 
        /// Unique camera id received by the android system.
        int mediumCameraId = -1;
 
        /// Recent frame type.
        FrameType imageRecentFrameType;
 
        /// State determining whether the camera is currently started.
        bool mediumIsStarted = false;
 
        /// Start timestamp.
        Timestamp mediumStartTimestamp;
 
        /// Pause timestamp.
        Timestamp mediumPauseTimestamp;
 
        /// Stop timestamp.
        Timestamp mediumStopTimestamp;
};
 
#endif // OCEAN_MEDIA_ANDROID_NATIVECAMERALIBRARY_AVAILABLE
 
}
 
}
 
}
 
#endif // META_OCEAN_MEDIA_ANDROID_A_LIVE_VIDEO_H