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https://github.com/LMMS/lmms.git
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da73ddd242
* advanced config: expose hidden constants to user screen * advanced config: add support for FFT window overlapping * waterfall: display at native resolution on high-DPI screens * waterfall: add cursor and improve label density * FFT: fix normalization so that 0 dBFS matches full-scale sinewave * FFT: decouple data acquisition from processing and display * FFT: separate lock for reallocation (to avoid some needless waiting) * moved ranges and other constants to a separate file * debug: better performance measurements * minor fixes * build the ringbuffer library as part of LMMS core
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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* lmms_constants.h - defines system constants
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*
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* Copyright (c) 2006 Danny McRae <khjklujn/at/users.sourceforge.net>
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*
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* This file is part of LMMS - https://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (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 GNU
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* 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
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef LMMS_CONSTANTS_H
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#define LMMS_CONSTANTS_H
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const long double LD_PI = 3.14159265358979323846264338327950288419716939937510;
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const long double LD_2PI = LD_PI * 2.0;
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const long double LD_PI_2 = LD_PI * 0.5;
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const long double LD_PI_R = 1.0 / LD_PI;
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const long double LD_PI_SQR = LD_PI * LD_PI;
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const long double LD_E = 2.71828182845904523536028747135266249775724709369995;
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const long double LD_E_R = 1.0 / LD_E;
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const double D_PI = (double) LD_PI;
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const double D_2PI = (double) LD_2PI;
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const double D_PI_2 = (double) LD_PI_2;
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const double D_PI_R = (double) LD_PI_R;
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const double D_PI_SQR = (double) LD_PI_SQR;
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const double D_E = (double) LD_E;
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const double D_E_R = (double) LD_E_R;
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const float F_PI = (float) LD_PI;
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const float F_2PI = (float) LD_2PI;
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const float F_PI_2 = (float) LD_PI_2;
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const float F_PI_R = (float) LD_PI_R;
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const float F_PI_SQR = (float) LD_PI_SQR;
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const float F_E = (float) LD_E;
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const float F_E_R = (float) LD_E_R;
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// Frequency ranges (in Hz).
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// Arbitrary low limit for logarithmic frequency scale; >1 Hz.
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const int LOWEST_LOG_FREQ = 10;
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// Full range is defined by LOWEST_LOG_FREQ and current sample rate.
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enum FREQUENCY_RANGES
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{
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FRANGE_FULL = 0,
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FRANGE_AUDIBLE,
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FRANGE_BASS,
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FRANGE_MIDS,
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FRANGE_HIGH
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};
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const int FRANGE_AUDIBLE_START = 20;
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const int FRANGE_AUDIBLE_END = 20000;
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const int FRANGE_BASS_START = 20;
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const int FRANGE_BASS_END = 300;
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const int FRANGE_MIDS_START = 200;
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const int FRANGE_MIDS_END = 5000;
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const int FRANGE_HIGH_START = 4000;
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const int FRANGE_HIGH_END = 20000;
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// Amplitude ranges (in dBFS).
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// Reference: full scale sine wave (-1.0 to 1.0) is 0 dB.
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// Doubling or halving the amplitude produces 3 dB difference.
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enum AMPLITUDE_RANGES
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{
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ARANGE_EXTENDED = 0,
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ARANGE_AUDIBLE,
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ARANGE_LOUD,
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ARANGE_SILENT
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};
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const int ARANGE_EXTENDED_START = -80;
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const int ARANGE_EXTENDED_END = 20;
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const int ARANGE_AUDIBLE_START = -50;
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const int ARANGE_AUDIBLE_END = 0;
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const int ARANGE_LOUD_START = -30;
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const int ARANGE_LOUD_END = 0;
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const int ARANGE_SILENT_START = -60;
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const int ARANGE_SILENT_END = -10;
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#endif
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