99 lines
2.7 KiB
C++
99 lines
2.7 KiB
C++
/*
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* Copyright (C) 2015 David Robillard <d@drobilla.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __ardour_channel_filter_h__
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#define __ardour_channel_filter_h__
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#include <atomic>
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#include <cstdint>
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#include <glib.h>
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#include "pbd/signals.h"
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#include "ardour/types.h"
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namespace ARDOUR
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{
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class BufferSet;
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/** Filter/mapper for MIDI channels.
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*
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* Channel mapping is configured by setting a mode and "mask", where the
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* meaning of the mask depends on the mode.
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*
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* If mode is FilterChannels, each mask bit represents a midi channel (bit 0 =
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* channel 0, bit 1 = channel 1, ...). Only events whose channel corresponds
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* to a 1 bit will be passed.
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*
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* If mode is ForceChannel, mask is simply a channel number which all events
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* will be forced to.
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*/
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class LIBARDOUR_API MidiChannelFilter
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{
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public:
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MidiChannelFilter();
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/** Filter `bufs` in-place. */
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void filter(BufferSet& bufs);
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/** Filter/map a MIDI message by channel.
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*
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* May modify the channel in `buf` if necessary.
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*
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* @return true if this event should be filtered out.
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*/
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bool filter(uint8_t* buf, uint32_t len);
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/** Atomically set the channel mode and corresponding mask.
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* @return true iff configuration changed.
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*/
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bool set_channel_mode(ChannelMode mode, uint16_t mask);
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/** Atomically set the channel mask for the current mode.
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* @return true iff configuration changed.
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*/
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bool set_channel_mask(uint16_t mask);
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/** Atomically get both the channel mode and mask. */
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void get_mode_and_mask(ChannelMode* mode, uint16_t* mask) const {
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const uint32_t mm = _mode_mask.load();
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*mode = static_cast<ChannelMode>((mm & 0xFFFF0000) >> 16);
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*mask = (mm & 0x0000FFFF);
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}
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ChannelMode get_channel_mode() const {
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return static_cast<ChannelMode> ((_mode_mask.load() & 0xFFFF0000) >> 16);
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}
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uint16_t get_channel_mask() const {
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return _mode_mask.load() & 0x0000FFFF;
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}
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PBD::Signal0<void> ChannelMaskChanged;
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PBD::Signal0<void> ChannelModeChanged;
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private:
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std::atomic<uint32_t> _mode_mask; ///< 16 bits mode, 16 bits mask
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};
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} /* namespace ARDOUR */
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#endif /* __ardour_channel_filter_h__ */
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