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/*
Copyright (C) 2006-2015 Paul Davis
Author: David Robillard
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_channel_filter_h__
#define __ardour_channel_filter_h__
#include <stdint.h>
#include <glib.h>
#include "ardour/types.h"
#include "pbd/signals.h"
namespace ARDOUR
{
class BufferSet;
/** Filter/mapper for MIDI channels.
*
* Channel mapping is configured by setting a mode and "mask", where the
* meaning of the mask depends on the mode.
*
* If mode is FilterChannels, each mask bit represents a midi channel (bit 0 =
* channel 0, bit 1 = channel 1, ...). Only events whose channel corresponds
* to a 1 bit will be passed.
*
* If mode is ForceChannel, mask is simply a channel number which all events
* will be forced to.
*/
class LIBARDOUR_API MidiChannelFilter
{
public:
MidiChannelFilter();
/** Filter `bufs` in-place. */
void filter(BufferSet& bufs);
/** Filter/map a MIDI message by channel.
*
* May modify the channel in `buf` if necessary.
*
* @return true if this event should be filtered out.
*/
bool filter(uint8_t* buf, uint32_t len);
/** Atomically set the channel mode and corresponding mask.
* @return true iff configuration changed.
*/
bool set_channel_mode(ChannelMode mode, uint16_t mask);
/** Atomically set the channel mask for the current mode.
* @return true iff configuration changed.
*/
bool set_channel_mask(uint16_t mask);
/** Atomically get both the channel mode and mask. */
void get_mode_and_mask(ChannelMode* mode, uint16_t* mask) const {
const uint32_t mm = g_atomic_int_get(&_mode_mask);
*mode = static_cast<ChannelMode>((mm & 0xFFFF0000) >> 16);
*mask = (mm & 0x0000FFFF);
}
ChannelMode get_channel_mode() const {
return static_cast<ChannelMode>((g_atomic_int_get(&_mode_mask) & 0xFFFF0000) >> 16);
}
uint16_t get_channel_mask() const {
return g_atomic_int_get(&_mode_mask) & 0x0000FFFF;
}
PBD::Signal0<void> ChannelMaskChanged;
PBD::Signal0<void> ChannelModeChanged;
private:
uint32_t _mode_mask; ///< 16 bits mode, 16 bits mask
};
} /* namespace ARDOUR */
#endif /* __ardour_channel_filter_h__ */
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