diff options
Diffstat (limited to 'libs/fluidsynth/src/fluid_conv.h')
| -rw-r--r-- | libs/fluidsynth/src/fluid_conv.h | 58 |
1 files changed, 34 insertions, 24 deletions
diff --git a/libs/fluidsynth/src/fluid_conv.h b/libs/fluidsynth/src/fluid_conv.h index 29793c3359..d84a321c6c 100644 --- a/libs/fluidsynth/src/fluid_conv.h +++ b/libs/fluidsynth/src/fluid_conv.h @@ -3,16 +3,16 @@ * Copyright (C) 2003 Peter Hanappe and others. * * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public License - * as published by the Free Software Foundation; either version 2 of + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This library 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 - * Library General Public License for more details. + * Lesser General Public License for more details. * - * You should have received a copy of the GNU Library General Public + * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA @@ -23,24 +23,42 @@ #include "fluidsynth_priv.h" -#define FLUID_CENTS_HZ_SIZE 1200 -#define FLUID_VEL_CB_SIZE 128 -#define FLUID_CB_AMP_SIZE 961 -#define FLUID_ATTEN_AMP_SIZE 1441 -#define FLUID_PAN_SIZE 1002 +/* + Attenuation range in centibels. + Attenuation range is the dynamic range of the volume envelope generator + from 0 to the end of attack segment. + fluidsynth is a 24 bit synth, it could (should??) be 144 dB of attenuation. + However the spec makes no distinction between 16 or 24 bit synths, so use + 96 dB here. -/* EMU 8k/10k don't follow spec in regards to volume attenuation. - * This factor is used in the equation pow (10.0, cb / FLUID_ATTEN_POWER_FACTOR). - * By the standard this should be -200.0. */ -/* 07/11/2008 modified by S. Christian Collins for increased velocity sensitivity. Now it equals the response of EMU10K1 programming.*/ -#define FLUID_ATTEN_POWER_FACTOR (-200.0) /* was (-531.509)*/ + Note about usefulness of 24 bits: + 1)Even fluidsynth is a 24 bit synth, this format is only relevant if + the sample format coming from the soundfont is 24 bits and the audio sample format + choosen by the application (audio.sample.format) is not 16 bits. + + 2)When the sample soundfont is 16 bits, the internal 24 bits number have + 16 bits msb and lsb to 0. Consequently, at the DAC output, the dynamic range of + this 24 bit sample is reduced to the the dynamic of a 16 bits sample (ie 90 db) + even if this sample is produced by the audio driver using an audio sample format + compatible for a 24 bit DAC. + + 3)When the audio sample format settings is 16 bits (audio.sample.format), the + audio driver will make use of a 16 bit DAC, and the dynamic will be reduced to 96 dB + even if the initial sample comes from a 24 bits soundfont. + + In both cases (2) or (3), the real dynamic range is only 96 dB. + + Other consideration for FLUID_NOISE_FLOOR related to case (1),(2,3): + - for case (1), FLUID_NOISE_FLOOR should be the noise floor for 24 bits (i.e -138 dB). + - for case (2) or (3), FLUID_NOISE_FLOOR should be the noise floor for 16 bits (i.e -90 dB). + */ +#define FLUID_PEAK_ATTENUATION 960.0f void fluid_conversion_config(void); fluid_real_t fluid_ct2hz_real(fluid_real_t cents); fluid_real_t fluid_ct2hz(fluid_real_t cents); fluid_real_t fluid_cb2amp(fluid_real_t cb); -fluid_real_t fluid_atten2amp(fluid_real_t atten); fluid_real_t fluid_tc2sec(fluid_real_t tc); fluid_real_t fluid_tc2sec_delay(fluid_real_t tc); fluid_real_t fluid_tc2sec_attack(fluid_real_t tc); @@ -48,16 +66,8 @@ fluid_real_t fluid_tc2sec_release(fluid_real_t tc); fluid_real_t fluid_act2hz(fluid_real_t c); fluid_real_t fluid_hz2ct(fluid_real_t c); fluid_real_t fluid_pan(fluid_real_t c, int left); +fluid_real_t fluid_balance(fluid_real_t balance, int left); fluid_real_t fluid_concave(fluid_real_t val); fluid_real_t fluid_convex(fluid_real_t val); -extern fluid_real_t fluid_ct2hz_tab[FLUID_CENTS_HZ_SIZE]; -extern fluid_real_t fluid_vel2cb_tab[FLUID_VEL_CB_SIZE]; -extern fluid_real_t fluid_cb2amp_tab[FLUID_CB_AMP_SIZE]; -extern fluid_real_t fluid_posbp_tab[128]; -extern fluid_real_t fluid_concave_tab[128]; -extern fluid_real_t fluid_convex_tab[128]; -extern fluid_real_t fluid_pan_tab[FLUID_PAN_SIZE]; - - #endif /* _FLUID_CONV_H */ |