ardour/ardour/source.h

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/*
 * Copyright (C) 2006-2014 David Robillard <d@drobilla.net>
 * Copyright (C) 2006-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2009-2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2016-2019 Robin Gareus <robin@gareus.org>
 * Copyright (C) 2018-2019 Ben Loftis <ben@harrisonconsoles.com>
 *
 * 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
 
#include <atomic>
#include <memory>
#include <string>
 
#include "pbd/mutex.h"
#include "pbd/rwlock.h"
#include "pbd/statefuldestructible.h"
 
#include "ardour/ardour.h"
#include "ardour/scale_provider.h"
#include "ardour/session_object.h"
#include "ardour/data_type.h"
#include "ardour/segment_descriptor.h"
 
namespace ARDOUR {
 
class Session;
 
class LIBARDOUR_API Source : public SessionObject,
                             public std::enable_shared_from_this<ARDOUR::Source>,
                             public ScaleProvider
{
public:
        enum Flag {
                Writable = 0x1,
                CanRename = 0x2,
                Broadcast = 0x4,
                Removable = 0x8,
                RemovableIfEmpty = 0x10,
                RemoveAtDestroy = 0x20,
                NoPeakFile = 0x40,
                /* No longer in use but kept to allow loading of older sessions */
                Destructive = 0x80,
                Empty = 0x100, /* used for MIDI only */
                RF64_RIFF = 0x200,
                Missing = 0x400, /* used for MIDI only */
        };
 
        typedef PBD::RWLock::ReaderLock ReaderLock;
        typedef PBD::RWLock::WriterLock WriterLock;
 
        Source (Session&, DataType type, const std::string& name, Flag flags=Flag(0));
        Source (Session&, const XMLNode&);
 
        virtual ~Source ();
 
        DataType type() { return _type; }
 
        time_t timestamp() const { return _timestamp; }
        void stamp (time_t when) { _timestamp = when; }
 
        virtual timepos_t length() const { return _length; }
 
        virtual bool        empty () const;
        virtual void        update_length (timepos_t const & dur) {}
 
        void                 set_take_id (std::string id) { _take_id =id; }
        const std::string&   take_id ()        const { return _take_id; }
 
        void mark_for_remove();
 
        virtual void mark_streaming_write_started (const WriterLock& lock) {}
        /* The duration argument is ignored for audio data, where length is
           implicitly given by the sample data. It matters for MIDI data, where
           the file may be intended to be N bars long, but has no events that
           occur at that duration.
        */
        virtual void mark_streaming_write_completed (const WriterLock& lock, Temporal::timecnt_t const & duration) = 0;
 
        virtual void session_saved() {}
 
        XMLNode& get_state () const;
        int set_state (XMLNode const &, int version);
 
        bool         writable () const;
 
        virtual bool length_mutable() const    { return false; }
 
        static PBD::Signal<void(Source*)>             SourceCreated;
 
        bool has_been_analysed() const;
        virtual bool can_be_analysed() const { return false; }
        virtual void set_been_analysed (bool yn);
        virtual bool check_for_analysis_data_on_disk();
 
        PBD::Signal<void()> AnalysisChanged;
 
        AnalysisFeatureList transients;
        std::string get_transients_path() const;
        int load_transients (const std::string&);
 
        size_t n_captured_xruns () const { return _xruns.size (); }
        XrunPositions const& captured_xruns () const { return _xruns; }
        void set_captured_xruns (XrunPositions const& xruns) { _xruns = xruns; }
        void set_captured_marks (CueMarkers const& marks);
 
        CueMarkers const & cue_markers() const { return _cue_markers; }
        bool add_cue_marker (CueMarker const &);
        bool move_cue_marker (CueMarker const &, timepos_t const & source_relative_position);
        bool remove_cue_marker (CueMarker const &);
        bool rename_cue_marker (CueMarker&, std::string const &);
        bool clear_cue_markers ();
        PBD::Signal<void()> CueMarkersChanged;
 
        virtual timepos_t natural_position() const { return _natural_position; }
        virtual void set_natural_position (timepos_t const & pos);
 
        bool have_natural_position() const { return _have_natural_position; }
 
        /* This method is only for use during a capture pass. It makes no sense
         * in any other context.
         */
        timecnt_t time_since_capture_start (timepos_t const & pos);
 
        void set_allow_remove_if_empty (bool yn);
 
        PBD::RWLock& mutex() { return _lock; }
        Flag flags() const { return _flags; }
 
        virtual void inc_use_count ();
        virtual void dec_use_count ();
        int  use_count() const { return _use_count.load(); }
        bool used() const { return use_count() > 0; }
 
        uint32_t level() const { return _level; }
 
        std::string ancestor_name() { return _ancestor_name.empty() ? name() : _ancestor_name; }
        void set_ancestor_name(const std::string& name) { _ancestor_name = name; }
 
        void set_captured_for (std::string str) { _captured_for = str; }
        std::string captured_for() const { return _captured_for; }
 
        bool get_segment_descriptor (TimelineRange const &, SegmentDescriptor&);
        int set_segment_descriptor (SegmentDescriptor const &, bool replace = false);
 
        void copy_segment_descriptors (Source const & other);
 
  protected:
        DataType            _type;
        Flag                _flags;
        time_t              _timestamp;
        std::string         _take_id;
        timepos_t           _natural_position;
        bool                _have_natural_position;
        bool                _analysed;
        std::atomic<int>    _use_count;
        uint32_t            _level; /* how deeply nested is this source w.r.t a disk file */
        std::string         _ancestor_name;
        std::string        _captured_for;
        timepos_t          _length;
        XrunPositions      _xruns;
        CueMarkers         _cue_markers;
 
        typedef std::vector<SegmentDescriptor> SegmentDescriptors;
        SegmentDescriptors segment_descriptors;
 
        mutable PBD::RWLock _lock;
        mutable PBD::Mutex _analysis_lock;
 
  private:
        void fix_writable_flags ();
 
        XMLNode& get_cue_state () const;
        int set_cue_state (XMLNode const &, int);
};
 
}