ardour/ardour/port.h

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/*
 * Copyright (C) 2006-2011 David Robillard <d@drobilla.net>
 * Copyright (C) 2006-2018 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2007-2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2015-2019 Robin Gareus <robin@gareus.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#ifdef WAF_BUILD
#include "libardour-config.h"
#endif
 
#include <set>
#include <string>
#include <vector>
#include "pbd/signals.h"
 
#include "ardour/data_type.h"
#include "ardour/port_engine.h"
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
 
namespace ARDOUR {
 
class AudioEngine;
class Buffer;
 
class LIBARDOUR_API Port
{
public:
        Port (const Port&) = delete;
        Port& operator= (const Port&) = delete;
        virtual ~Port ();
 
        static void set_connecting_blocked( bool yn ) {
                _connecting_blocked = yn;
        }
        static bool connecting_blocked() {
                return _connecting_blocked;
        }
 
        std::string name () const {
                return _name;
        }
 
        std::string pretty_name (bool fallback_to_name = false) const;
        bool set_pretty_name (const std::string&);
 
        int set_name (std::string const &);
 
        PortFlags flags () const {
                return _flags;
        }
 
        bool receives_input () const {
                return _flags & IsInput;
        }
 
        bool sends_output () const {
                return _flags & IsOutput;
        }
 
        bool connected () const;
        int disconnect_all ();
        int get_connections (std::vector<std::string> &) const;
 
        /* connection by name */
        bool connected_to (std::string const &) const;
        int connect (std::string const &);
        int disconnect (std::string const &);
 
        /* connection by Port* */
        bool connected_to (Port *) const;
        virtual int connect (Port *);
        int disconnect (Port *);
 
        void request_input_monitoring (bool);
        void ensure_input_monitoring (bool);
        bool monitoring_input () const;
        int reestablish ();
        int reconnect ();
 
        bool last_monitor() const { return _last_monitor; }
        void set_last_monitor (bool yn) { _last_monitor = yn; }
 
        PortEngine::PortHandle port_handle() { return _port_handle; }
 
        void get_connected_latency_range (LatencyRange& range, bool playback) const;
 
        void collect_latency_from_backend (LatencyRange& range, bool playback) const;
 
        void set_private_latency_range (LatencyRange& range, bool playback);
        const LatencyRange&  private_latency_range (bool playback) const;
 
        void set_public_latency_range (LatencyRange const& range, bool playback) const;
        LatencyRange public_latency_range (bool playback) const;
 
        virtual void reset ();
 
        virtual DataType type () const = 0;
        virtual void cycle_start (pframes_t);
        virtual void cycle_end (pframes_t);
        virtual void cycle_split () = 0;
        virtual void reinit (bool) {}
        virtual Buffer& get_buffer (pframes_t nframes) = 0;
        virtual void flush_buffers (pframes_t /*nframes*/) {}
        virtual void transport_stopped () {}
        virtual void realtime_locate (bool for_loop_end) {}
        virtual void set_buffer_size (pframes_t) {}
 
        bool has_ext_connection () const;
        bool physically_connected () const;
        bool in_cycle () const { return _in_cycle; }
 
        uint32_t externally_connected () const { return _externally_connected; }
        uint32_t internally_connected () const { return _internally_connected; }
 
        void increment_external_connections ();
        void decrement_external_connections ();
 
        void increment_internal_connections ();
        void decrement_internal_connections ();
 
 
        PBD::Signal<void(bool)> MonitorInputChanged;
        PBD::Signal<void(std::shared_ptr<Port>,std::shared_ptr<Port>, bool )> ConnectedOrDisconnected;
 
        static PBD::Signal<void()> PortDrop;
        static PBD::Signal<void()> PortSignalDrop;
        static PBD::Signal<void()> ResamplerQualityChanged;
 
        static void set_varispeed_ratio (double s); //< varispeed playback
        static bool set_engine_ratio (double session, double engine); //< SR mismatch
        static void set_cycle_samplecnt (pframes_t n);
 
        static samplecnt_t port_offset() { return _global_port_buffer_offset; }
        static void set_global_port_buffer_offset (pframes_t off) {
                _global_port_buffer_offset = off;
        }
        static void increment_global_port_buffer_offset (pframes_t n) {
                _global_port_buffer_offset += n;
        }
 
        virtual XMLNode& get_state () const;
        virtual int set_state (const XMLNode&, int version);
 
        static std::string state_node_name;
 
        static pframes_t cycle_nframes () { return _cycle_nframes; }
        static double speed_ratio () { return _speed_ratio; }
        static double engine_ratio () { return _engine_ratio; }
        static double resample_ratio () { return _resample_ratio; } // == _speed_ratio * _engine_ratio
 
        static uint32_t resampler_quality () { return _resampler_quality; }
        static uint32_t resampler_latency () { return _resampler_latency; }
        static bool     can_varispeed ()     { return _resampler_latency > 0; }
        static bool     setup_resampler (uint32_t q = 17);
 
protected:
 
        Port (std::string const &, DataType, PortFlags);
 
        PortEngine::PortPtr _port_handle;
 
        static bool       _connecting_blocked;
        static pframes_t  _cycle_nframes; /* access only from process() tree */
 
        static pframes_t  _global_port_buffer_offset; /* access only from process() tree */
 
        LatencyRange _private_playback_latency;
        LatencyRange _private_capture_latency;
 
        static double _speed_ratio;
        static double _engine_ratio;
        static double _resample_ratio; // = _speed_ratio * _engine_ratio (cached)
 
private:
        std::string _name;  
        PortFlags   _flags; 
        bool        _last_monitor;
        bool        _in_cycle;
        uint32_t    _externally_connected;
        uint32_t    _internally_connected;
 
        typedef std::set<std::string> ConnectionSet;
        /* ports that we are connected to, kept so that we can
         * reconnect to the backend when required
         */
        mutable Glib::Threads::RWLock        _connections_lock;
        ConnectionSet                        _int_connections;
        std::map<std::string, ConnectionSet> _ext_connections;
 
        static uint32_t _resampler_quality; // 8 <= q <= 96
        static uint32_t _resampler_latency; // = _resampler_quality - 1
 
        void port_connected_or_disconnected (std::weak_ptr<Port>, std::string, std::weak_ptr<Port>, std::string, bool);
 
        int  connect_internal (std::string const &);
        void insert_connection (std::string const&);
        void erase_connection (std::string const&);
 
        void signal_drop ();
        void session_global_drop ();
        void drop ();
        PBD::ScopedConnectionList drop_connection;
        PBD::ScopedConnection engine_connection;
};
 
}