looper/dbus.hpp

#pragma once
#ifdef DBUS_ENABLED
#include <sdbus-c++/sdbus-c++.h>
#include <sdbus-c++/StandardInterfaces.h>
#include "assets/dbus_stub_adaptor.hpp"
#include "assets/dbus_stub_proxy.hpp"
#include "assets/mpris_stub_adaptor.hpp"
#endif
#include "playback.h"
#include <mutex>
#include <optional>
#include <random>
#include <thread>
#ifdef DBUS_ENABLED
class DBusAPI;
class MprisAPI : public sdbus::AdaptorInterfaces<org::mpris::MediaPlayer2_adaptor, org::mpris::MediaPlayer2::Player_adaptor, org::mpris::MediaPlayer2::TrackList_adaptor, sdbus::Properties_adaptor> {
    friend class DBusAPI;
    DBusAPI *dbus_api;
    const std::string streamPrefix = "/com/complecwaft/looper/Streams/";
    std::string curPlayingObjectPath;
    sdbus::IConnection &connection;
    const std::string mainInterface = "org.mpris.MediaPlayer2";
    const std::string playerInterface = "org.mpris.MediaPlayer2.Player";
    const std::string trackInterface = "org.mpris.MediaPlayer2.TrackList";
    inline void sendPropertiesChanged(const std::string interface, const std::initializer_list<std::string> properties) {
        std::vector<std::string> property_vec;
        for (auto property : properties) {
            property_vec.push_back(property);
        }
        emitPropertiesChangedSignal(interface, property_vec);
    }
    public:
#define meta_t std::map<std::string, sdbus::Variant>
#define track_id_t sdbus::ObjectPath
    const sdbus::ObjectPath playing_track_id = "/com/complecwaft/Looper/PlayingTrack";
    const sdbus::ObjectPath empty_track_id = "/org/mpris/MediaPlayer2/TrackList/NoTrack";

    inline void Raise() override { }
    void Quit() override;
    inline std::string Identity() override {
        return "Looper";
    }
    inline std::vector<std::string> SupportedUriSchemes() override {
        std::vector<std::string> output;
        output.push_back("file:");
        return output;
    }
    inline std::vector<std::string> SupportedMimeTypes() override {
        std::vector<std::string> output;
        output.push_back("audio/*");
        return output;
    }
    inline void Next() override { }
    inline void Previous() override { }
    void Pause() override;
    void PlayPause() override;
    void Stop() override;
    void Play() override;
    void Seek(const int64_t &offset) override;
    void SetPosition(const track_id_t &TrackId, const int64_t &Position) override;
    void OpenUri(const std::string &Uri) override;
    std::string PlaybackStatus() override;
    double Rate() override;
    void Rate(const double &value) override;
    meta_t Metadata() override;
    double Volume() override;
    void Volume(const double& value) override;
    int64_t Position() override;
    inline double MinimumRate() override {
        return 0.25;
    }
    inline double MaximumRate() override {
        return 4.0;
    }
    inline bool CanGoNext() override {
        return false;
    }
    inline bool CanGoPrevious() override {
        return false;
    }
    bool CanPlay() override;
    bool CanPause() override;
    bool CanSeek() override;
    inline bool CanControl() override {
        return true;
    }
    inline bool CanRaise() override {
        return false;
    }
    inline bool CanQuit() override {
        return true;
    }
    inline bool HasTrackList() override {
        return true;
    }
    std::vector<meta_t> GetTracksMetadata(const std::vector<track_id_t> &TrackIds) override;
    void AddTrack(const std::string &Uri, const track_id_t &AfterTrack, const bool &SetAsCurrent) override;
    void RemoveTrack(const track_id_t &TrackId) override;
    void GoTo(const track_id_t &TrackId) override;
    std::vector<track_id_t> Tracks() override;
    bool CanEditTracks() override;
    MprisAPI(sdbus::IConnection &connection, std::string objectPath, DBusAPI *dbus_api);
    ~MprisAPI();
};
#endif
class DBusAPI
#ifdef DBUS_ENABLED
 : public sdbus::AdaptorInterfaces<com::complecwaft::looper_adaptor, com::complecwaft::looper::Errors_adaptor, org::freedesktop::Application_adaptor> 
#endif
{
    std::map<std::string, void*> handles;
    size_t handle_idx = 0;
    public:
    static const char *objectPath;
    static const char *busName;
#ifdef DBUS_ENABLED
    private:
    MprisAPI *mpris;
    sdbus::IConnection &connection;
    std::minstd_rand rand_engine;
    std::deque<std::string> *get_errors_by_handle(const std::string &handle);
    bool daemon;
    std::atomic_bool threadExitFlag = false;
    std::thread threadFunc;
    public:
    void Activate(const std::map<std::string, sdbus::Variant>& platform_data) override;
    void Open(const std::vector<std::string>& uris, const std::map<std::string, sdbus::Variant>& platform_data) override;
    void ActivateAction(const std::string& action_name, const std::vector<sdbus::Variant>& parameter, const std::map<std::string, sdbus::Variant>& platform_data) override;
    // com.experimentalcraft.Looper
    // Properties
    std::string FilePath() override;
    std::string FileTitle() override;
    double Speed() override;
    void Speed(const double &value) override;
    double Tempo() override;
    void Tempo(const double& value) override;
    double Pitch() override;
    void Pitch(const double& value) override;
    double Volume() override;
    void Volume(const double& value) override;
    double Position() override;
    void Position(const double &value) override;
    double Length() override;
    // Pausing and Resuming
    bool Paused() override;
    void Paused(const bool& value) override;
    void TogglePause() override;
    // Starting new Files
    void Start(const std::string &path, const bool &isUri) override;
    void StartWithStreamIndex(const std::string& path, const bool& isUri, const uint32_t& streamIndex) override;
    void Load(const std::string &path, const bool &isUri) override;
    // Playback stopping
    void Stop() override;
    bool IsStopped() override;
    // Handles
    std::string CreateHandle() override;
    void ClearHandle(const std::string& handle) override;
    // com.experimentalcraft.Looper.Errors
    // Popping from the queue
    std::string PopFront(const std::string &handle) override;
    std::string PopBack(const std::string &handle) override;
    // Peeking at the values
    std::string PeekFront(const std::string &handle) override;
    std::string PeekBack(const std::string &handle) override;
    // Getting the amount of unread errors.
    uint32_t GetCount(const std::string &handle) override;
    bool IsEmpty(const std::string& handle) override;
    // Getting and Clearing Errors.
    void Clear(const std::string &handle) override;
    std::vector<std::string> PeekAll(const std::string &handle) override;
    std::vector<std::string> GetAllAndClear(const std::string &handle) override;
    bool IsDaemon() override;
    void Quit() override;
    uint32_t StreamIdx() override;
    std::vector<sdbus::Struct<double, std::string, int32_t>> GetStreams() override;
    void PlayStream(const uint32_t &idx) override;

#endif
    public:
    // API
    Playback *playback;
#ifdef DBUS_ENABLED
    void Update();
    DBusAPI(Playback *playback, sdbus::IConnection &connection, std::string objectPath, bool daemon);
#endif
    DBusAPI(Playback *playback, bool daemon);
    ~DBusAPI();
    static DBusAPI *Create(Playback *playback, bool daemon = false);
};
class DBusAPISender : public Playback
#ifdef DBUS_ENABLED
, public sdbus::ProxyInterfaces<com::complecwaft::looper_proxy, com::complecwaft::looper::Errors_proxy, org::freedesktop::Application_proxy, sdbus::Peer_proxy>
#endif 
{
    // Cache
    double length, pitch, speed, tempo, volume;
    bool stopped, paused;
    std::string filePath;
    std::string title;
    std::mutex cacheMutex;
    optional<std::string> last_error;
    // Handle for error handling.
    std::string handle;
    
    public:
    // Public API for creating this object, and checking if it is needed.
    /// @brief Checks if this is the only instance, by attempting creation and immediately deleting the created object.
    /// @returns true, if this is the only instance, false otherwise.
    static bool isOnlyInstance();
    /// @brief Creates a proxy playback engine, if possible.
    /// @returns A proxy to the main instance of the playback engine, or nullptr if there is none.
    static DBusAPISender *Create();

#ifdef DBUS_ENABLED
    // Signals. Protected so that they aren't seen as a proper API
    protected:
    void onPlaybackEngineStarted() override;
    void onSpeedChanged(const double &new_speed) override;
    void onTempoChanged(const double &new_tempo) override;
    void onPitchChanged(const double &new_pitch) override;
    void onPauseChanged(const bool &now_paused) override;
    void onStopped() override;
    void onErrorOccurred(const std::string &error_desc, const std::string &error_type) override;
    void onSeeked(const double &to_position) override;
    void onFileChanged(const std::string &path, const std::string &title) override;

    // Playback API. This is the API to be used by UI frontends.
    public:
    std::optional<std::string> get_current_file() override;
    std::optional<std::string> get_current_title() override;
    inline bool is_proxy() override {
        return true;
    }
    double GetPosition() override;
    double GetLength() override;
    void Seek(double position) override;
    void Start(std::string filePath, int streamIdx = 0) override;
    bool IsPaused() override;
    void Pause() override;
    void Stop() override;
    void Update();
    bool IsStopped() override;
    void SetTempo(float tempo) override;
    void SetPitch(float pitch) override;
    void SetSpeed(float speed) override;
    void SetVolume(float volume) override;
    float GetTempo() override;
    float GetPitch() override;
    float GetSpeed() override;
    float GetVolume() override;
    int get_current_stream() override;
    void Load(std::string filePath) override;
    std::vector<PlaybackStream> get_streams() override;
    // Constructors and destructors.
    // The constructor is protected because there is a different API that should be used for creation.
    protected:
    DBusAPISender(sdbus::IConnection &connection, std::string busName, std::string objectPath);
    public:
    ~DBusAPISender();
#else
    public:
    ~DBusAPISender() = default;
#endif
};