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/*
babo.h:
Copyright (C) 2000 Davide Rocchesso, Nicola Bernardini
This file is part of Csound.
The Csound Library is free software; you can redistribute it
and/or 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.
Csound 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*-------------------------------------------------------------------------*\
* vi:set nowrap ts=4:
*
* $Id$
*
* Header file for babo.c *
* We choose 15 nodes for the BABO structure tryng to achieve *
* sound quality results and minimal computational load according the rule *
* that the nodes must be (2^N-1) *
*
\*------------------------------------------------------------------------*/
/* Changes by JPff: Fixed constant BABO_DEFAULT_DIFFUSION_COEFF */
#if !defined(__babo_h__)
# define __babo_h__
#define BABO_NODES (15) /* Number of nodes of feedback delay network */
#define BABO_TAPS (6) /* Number of taps in the early reflections line */
typedef struct
{
AUXCH memptr;
size_t samples;
} BaboMemory;
typedef struct
{
BaboMemory core;
MYFLT *input;
} BaboDelay;
typedef BaboDelay BaboTapline;
typedef struct
{
MYFLT a0,
a1,
z1,
z2,
input;
} BaboLowPass;
typedef struct
{
BaboDelay delay;
BaboLowPass filter;
} BaboNode;
typedef struct
{
MYFLT complementary_early_diffusion;
MYFLT fdn[BABO_NODES][BABO_NODES];
BaboNode node[BABO_NODES] ;
} BaboMatrix;
/*
* The opcode functionality should be:
*
* ar,al babo asig,kx,ky,kz,ix,iy,iz[,idiff[,ifno]]
*
* where - mandatory arguments:
*
* kx,ky,kz - position of the source
* ix,iy,iz - dimensions of the resonator (room)
*
* optional arguments:
*
* idiff - diffusion coefficient (a number from 0 to 1: default 1)
* ifno - number of the GEN 02 function which holds all the other
* defaulted parameters
*
* the optional size-8 gen 02 function may hold the following parameters:
*
* fn 0 8 2 decay hidecay rx ry rz rdistance direct early_diff
*
* where:
*
* decay - global decay coefficient (a number from 0 to 1: default 0.99)
* hidecay - hi-freq decay coefficient (a number from 0 to 1: default 0.1)
* rx,ry,rz - position of the receiver (default: 0, 0, 0)
* rdistance - x distance between stereo receivers (e.g.: ears :)
* (default: 0.3)
* direct - direct delayed signal coefficient (default: 0.5)
* early_diff - diffusion coefficient of the early reflections (default: 0.8)
*
*/
typedef struct
{
OPDS h; /* defined in cs.h */
/* output args */
MYFLT *outleft,*outright,
/* start input args */
*input,
*ksource_x,*ksource_y,*ksource_z,
*lx,*ly,*lz,
/* optional args */
*odiffusion_coeff,
*oexpert_values;
/* end input args */
/* backward-logic optional args copy */
MYFLT diffusion_coeff,
expert_values;
/* internal values */
MYFLT decay, hidecay,
receiver_x, receiver_y, receiver_z,
inter_receiver_distance,
direct,
early_diffuse;
BaboTapline tapline; /* early reflections */
BaboDelay matrix_delay; /* diffusion delay */
BaboMatrix matrix; /* diffusion */
} BABO;
#define BABO_DEFAULT_DIFFUSION_COEFF (FL(1.0))
#define BABO_DEFAULT_DECAY (FL(0.99))
#define BABO_DEFAULT_HIDECAY (FL(0.1))
#define BABO_DEFAULT_RECV_X (FL(0.0))
#define BABO_DEFAULT_RECV_Y (FL(0.0))
#define BABO_DEFAULT_RECV_Z (FL(0.0))
#define BABO_DEFAULT_INTER_RECV_DISTANCE (FL(0.3))
#define BABO_DEFAULT_DIRECT (FL(0.5))
#define BABO_DEFAULT_DIFFUSE (FL(0.8))
#endif /* !defined(__babo_h__) */
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