segment_descriptor.h

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/*
 * Copyright (C) 2021 Paul Davis <paul@linuxaudiosystems.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 "temporal/timeline.h"
#include "temporal/tempo.h"
 
class XMLNode;
 
namespace ARDOUR {
 
/* An object that describes an extent (duration & position), along with a
 * potentially expanding set of metadata about that extent (e.g. bpm, meter
 * etc.)
 */
 
class SegmentDescriptor {
public:
        SegmentDescriptor ();
        SegmentDescriptor (XMLNode const &, int version);
 
        /* This object does not use the tempo map to convert between time
         * domains, since it describes things that are not (always) on the
         * timeline.
         */
 
        Temporal::TimeDomain time_domain() const { return _time_domain; }
 
        void set_position (Temporal::samplepos_t);
        void set_position (Temporal::Beats const &);
 
        void set_duration (Temporal::samplecnt_t);
        void set_duration (Temporal::Beats const &);
 
        void set_extent (Temporal::samplepos_t pos, Temporal::samplecnt_t dur);
        void set_extent (Temporal::Beats const & pos, Temporal::Beats const & dur);
 
        Temporal::timecnt_t extent() const;
        Temporal::timepos_t position() const { return extent().position(); }
 
        Temporal::Tempo tempo() const { return _tempo; }
        void set_tempo (Temporal::Tempo const&);
 
        Temporal::Meter meter() const { return _meter; }
        void set_meter (Temporal::Meter const&);
 
        /* Replicate the API of PBD::Stateful without the overhead */
 
        XMLNode& get_state () const;
        int set_state (const XMLNode&, int version);
 
private:
        Temporal::TimeDomain _time_domain;
 
        /* cannot use a union for these because Temporal::Beats has a
           "non-trivial" constructor.
        */
 
        Temporal::samplepos_t _position_samples;
        Temporal::Beats       _position_beats;
        Temporal::samplepos_t _duration_samples;
        Temporal::Beats       _duration_beats;
 
        Temporal::Tempo _tempo;
        Temporal::Meter _meter;
};
 
}