midi_channel_filter.h

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/*
 * Copyright (C) 2015 David Robillard <d@drobilla.net>
 *
 * 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 <cstdint>
 
#include <glib.h>
 
#include "pbd/signals.h"
 
#include "ardour/types.h"
 
namespace ARDOUR
{
 
class BufferSet;
 
class LIBARDOUR_API MidiChannelFilter
{
public:
        MidiChannelFilter();
 
        void filter(BufferSet& bufs);
 
        bool filter(uint8_t* buf, uint32_t len);
 
        bool set_channel_mode(ChannelMode mode, uint16_t mask);
 
        bool set_channel_mask(uint16_t mask);
 
        void get_mode_and_mask(ChannelMode* mode, uint16_t* mask) const {
                const uint32_t mm = _mode_mask.load();
                *mode = static_cast<ChannelMode>((mm & 0xFFFF0000) >> 16);
                *mask = (mm & 0x0000FFFF);
        }
 
        ChannelMode get_channel_mode() const {
                return static_cast<ChannelMode> ((_mode_mask.load() & 0xFFFF0000) >> 16);
        }
 
        uint16_t get_channel_mask() const {
                return _mode_mask.load() & 0x0000FFFF;
        }
 
        PBD::Signal<void()> ChannelMaskChanged;
        PBD::Signal<void()> ChannelModeChanged;
 
private:
        std::atomic<uint32_t> _mode_mask;  
};
 
} /* namespace ARDOUR */