filter.h

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3   Copyright (C) 2008 Nedko Arnaudov <nedko@arnaudov.name>
   4
   5   This program is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation; either version 2 of the License, or
   8   (at your option) any later version.
   9
  10   This program is distributed in the hope that it will be useful,
  11   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13   GNU General Public License for more details.
  14
  15   You should have received a copy of the GNU General Public License
  16   along with this program; if not, write to the Free Software
  17   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 #ifndef FILTER_H__D5DC5ADF_211A_48F6_93A5_68CD3B73D6C5__INCLUDED
  21 #define FILTER_H__D5DC5ADF_211A_48F6_93A5_68CD3B73D6C5__INCLUDED
  22
  23 typedef struct {int unused; } * filter_handle;
  24
  25 #define GLOBAL_PARAMETER_ACTIVE    0
  26 #define GLOBAL_PARAMETER_GAIN      1
  27 #define GLOBAL_PARAMETERS_COUNT    2
  28
  29 #define BAND_PARAMETER_ACTIVE      0
  30 #define BAND_PARAMETER_FREQUENCY   1
  31 #define BAND_PARAMETER_BANDWIDTH   2
  32 #define BAND_PARAMETER_GAIN        3
  33 #define BAND_PARAMETERS_COUNT      4
  34
  35 bool
  36 filter_create(
  37   float sample_rate,
  38   unsigned int bands_count,
  39   filter_handle * handle_ptr);
  40
  41 void
  42 filter_connect_global_parameter(
  43   filter_handle handle,
  44   unsigned int global_parameter,
  45   const float * value_ptr);
  46
  47 void
  48 filter_connect_band_parameter(
  49   filter_handle handle,
  50   unsigned int band_index,
  51   unsigned int band_parameter,
  52   const float * value_ptr);
  53
  54 void
  55 filter_run(
  56   filter_handle handle,
  57   const float * input_buffer,
  58   float * output_buffer,
  59   unsigned long samples_count);
  60
  61 void
  62 filter_destroy(
  63   filter_handle handle);
  64
  65 #endif /* #ifndef FILTER_H__D5DC5ADF_211A_48F6_93A5_68CD3B73D6C5__INCLUDED */