lmms_constants.h

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/*
 * lmms_constants.h - defines system constants
 *
 * Copyright (c) 2006 Danny McRae <khjklujn/at/users.sourceforge.net>
 * 
 * This file is part of LMMS - https://lmms.io
 *
 * 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 (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */
 
#ifndef LMMS_CONSTANTS_H
#define LMMS_CONSTANTS_H
 
#include "lmmsconfig.h"
#include "LmmsTypes.h"
 
namespace lmms
{
// Prefer using `approximatelyEqual()` from lmms_math.h rather than
// using this directly
inline constexpr float F_EPSILON = 1.0e-10f; // 10^-10
 
// Channel counts
inline constexpr auto DEFAULT_CHANNELS = ch_cnt_t{2};
inline constexpr auto MaxChannelsPerAudioBuffer = ch_cnt_t{128};
inline constexpr auto MaxGroupsPerAudioBuffer = group_cnt_t{MaxChannelsPerAudioBuffer / 2};
 
// Microtuner
inline constexpr unsigned MaxScaleCount = 10;  
inline constexpr unsigned MaxKeymapCount = 10; 
 
 
// Note: All constants below are used only in spectrum analyser
// Frequency ranges (in Hz).
// Arbitrary low limit for logarithmic frequency scale; >1 Hz.
inline constexpr auto LOWEST_LOG_FREQ = 5;
 
// Full range is defined by LOWEST_LOG_FREQ and current sample rate.
enum class FrequencyRange
{
        Full = 0,
        Audible,
        Bass,
        Mids,
        High
};
 
inline constexpr auto FRANGE_AUDIBLE_START =    20;
inline constexpr auto FRANGE_AUDIBLE_END   = 20000;
inline constexpr auto FRANGE_BASS_START    =    20;
inline constexpr auto FRANGE_BASS_END      =   300;
inline constexpr auto FRANGE_MIDS_START    =   200;
inline constexpr auto FRANGE_MIDS_END      =  5000;
inline constexpr auto FRANGE_HIGH_START    =  4000;
inline constexpr auto FRANGE_HIGH_END      = 20000;
 
// Amplitude ranges (in dBFS).
// Reference: full scale sine wave (-1.0 to 1.0) is 0 dB.
// Doubling or halving the amplitude produces 3 dB difference.
enum class AmplitudeRange
{
        Extended = 0,
        Audible,
        Loud,
        Silent
};
 
inline constexpr auto ARANGE_EXTENDED_START = -80;
inline constexpr auto ARANGE_EXTENDED_END   =  20;
inline constexpr auto ARANGE_AUDIBLE_START  = -50;
inline constexpr auto ARANGE_AUDIBLE_END    =   0;
inline constexpr auto ARANGE_LOUD_START     = -30;
inline constexpr auto ARANGE_LOUD_END       =   0;
inline constexpr auto ARANGE_SILENT_START   = -60;
inline constexpr auto ARANGE_SILENT_END     = -10;
 
 
// This macro is used to handle path separation properly in windows
constexpr char LADSPA_PATH_SEPERATOR =
#ifdef LMMS_BUILD_WIN32
';';
#else
':';
#endif
 
} // namespace lmms
 
#endif // LMMS_CONSTANTS_H