ardour/ardour/meter.h

Go to the documentation of this file.

/*
 * Copyright (C) 2006-2012 David Robillard <d@drobilla.net>
 * Copyright (C) 2007-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2009-2011 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2013-2020 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
 
#include <atomic>
#include <vector>
 
#include "pbd/fastlog.h"
 
#include "ardour/libardour_visibility.h"
#include "ardour/processor.h"
#include "ardour/types.h"
 
#include "ardour/iec1ppmdsp.h"
#include "ardour/iec2ppmdsp.h"
#include "ardour/kmeterdsp.h"
#include "ardour/vumeterdsp.h"
 
namespace ARDOUR {
 
class BufferSet;
class ChanCount;
class Session;
 
class LIBARDOUR_API PeakMeter : public Processor
{
public:
        PeakMeter (Session& s, const std::string& name);
        ~PeakMeter ();
 
        void reset ();
        void reset_max ();
 
        std::string display_name () const;
 
        bool can_support_io_configuration (const ChanCount& in, ChanCount& out);
        bool configure_io (ChanCount in, ChanCount out);
 
        /* special method for meter, to ensure that it can always handle the maximum
           number of streams in the route, no matter where we put it.
        */
 
        void set_max_channels (const ChanCount&);
 
        /* tell the meter than no matter how many channels it can handle,
           `in' is the number it is actually going be handling from
           now on.
        */
 
        void reflect_inputs (const ChanCount& in);
        void emit_configuration_changed ();
 
        void run (BufferSet& bufs, samplepos_t start_sample, samplepos_t end_sample, double speed, pframes_t nframes, bool);
 
        void activate () {}
        void deactivate () {}
 
        ChanCount input_streams ()  const { return current_meters; }
        ChanCount output_streams () const { return current_meters; }
 
        float meter_level (uint32_t n, MeterType type);
 
        void      set_meter_type (MeterType t);
        MeterType meter_type () const { return _meter_type; }
 
        PBD::Signal<void(MeterType)> MeterTypeChanged;
 
protected:
        XMLNode& state () const;
 
private:
        friend class IO;
 
        ChanCount current_meters;
        ChanCount _max_n_meters;
 
        std::atomic<int> _reset_dpm;
        std::atomic<int> _reset_max;
 
        uint32_t           _bufcnt;
        std::vector<float> _peak_buffer;     // internal, integrate
        std::vector<float> _peak_power;      // includes accurate falloff, hence dB
        std::vector<float> _max_peak_signal; // dB calculation is done on demand
 
        std::vector<Kmeterdsp*>  _kmeter;
        std::vector<Iec1ppmdsp*> _iec1meter;
        std::vector<Iec2ppmdsp*> _iec2meter;
        std::vector<Vumeterdsp*> _vumeter;
 
        MeterType _meter_type;
};
 
} // namespace ARDOUR