meter.h

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/*
    Copyright (C) 2006 Paul Davis

    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.,
    675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef __ardour_meter_h__
#define __ardour_meter_h__

#include <vector>
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
#include "ardour/processor.h"
#include "pbd/fastlog.h"

#include "ardour/kmeterdsp.h"
#include "ardour/iec1ppmdsp.h"
#include "ardour/iec2ppmdsp.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 ();

        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, framepos_t start_frame, framepos_t end_frame, 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_type(MeterType t);
        MeterType get_type() { return _meter_type; }

        XMLNode& state (bool full);

        PBD::Signal1<void, MeterType> TypeChanged;

private:
        friend class IO;

        ChanCount current_meters;

        bool               _reset_dpm;
        bool               _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

#endif // __ardour_meter_h__