148 lines
4 KiB
C
148 lines
4 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2014 by Chiwen Chang
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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 License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "afr.h"
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#include "config.h"
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#include "fixedpoint.h"
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#include "fracmul.h"
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#include "settings.h"
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#include "dsp_proc_entry.h"
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#include "dsp_filter.h"
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/* Auditory fatigue reduction */
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static int afr_strength = 0;
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static struct dsp_filter afr_filters[4];
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static void dsp_afr_flush(void)
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{
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for (int i = 0 ;i < 4;i++)
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filter_flush(&afr_filters[i]);
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}
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static void strength_update(unsigned int fout)
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{
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int hs=0, ls=0, drop3k=0;
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switch (afr_strength)
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{
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/* not called if afr_strength == 0 (disabled) */
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case 1:
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hs=-29; ls=0; drop3k=-13;
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break;
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case 2:
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hs=-58; ls=-5; drop3k=-29;
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break;
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case 3:
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hs=-72; ls=-5; drop3k=-48;
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break;
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}
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filter_bishelf_coefs(fp_div(8000, fout, 32),
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fp_div(20000, fout, 32),
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0, (hs/2), 0,
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&afr_filters[0]);
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filter_pk_coefs(fp_div(8000, fout, 32), 28, hs,
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&afr_filters[1]);
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filter_pk_coefs(fp_div(3150, fout, 32), 28, drop3k,
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&afr_filters[2]);
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filter_bishelf_coefs(fp_div(200, fout, 32),
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fp_div(1280, fout, 32),
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ls, 0, 0,
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&afr_filters[3]);
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}
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void dsp_afr_enable(int var)
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{
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if (var == afr_strength)
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return; /* No setting change */
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bool was_enabled = afr_strength > 0;
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afr_strength = var;
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bool now_enabled = var > 0;
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if (was_enabled == now_enabled && !now_enabled)
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return;
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/* If changing status, enable or disable it; if already enabled push
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additional DSP_PROC_INIT messages with value = 1 to force-update the
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filters */
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struct dsp_config *dsp = dsp_get_config(CODEC_IDX_AUDIO);
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dsp_proc_enable(dsp, DSP_PROC_AFR, now_enabled);
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}
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static void afr_reduce_process(struct dsp_proc_entry *this,
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struct dsp_buffer **buf_p)
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{
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struct dsp_buffer *buf = *buf_p;
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for (int i = 0; i < 4; i++)
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filter_process(&afr_filters[i], buf->p32, buf->remcount,
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buf->format.num_channels);
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(void)this;
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}
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/* DSP message hook */
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static intptr_t afr_configure(struct dsp_proc_entry *this,
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struct dsp_config *dsp,
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unsigned int setting,
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intptr_t value)
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{
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/* This only attaches to the audio (codec) DSP */
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switch (setting)
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{
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case DSP_PROC_INIT:
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if (value == 0)
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{
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/* Coming online; was disabled */
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this->process = afr_reduce_process;
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dsp_afr_flush();
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dsp_proc_activate(dsp, DSP_PROC_AFR, true);
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}
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/* else additional forced messages */
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strength_update(dsp_get_output_frequency(dsp));
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break;
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case DSP_FLUSH:
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/* Discontinuity; clear filters */
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dsp_afr_flush();
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break;
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case DSP_SET_OUT_FREQUENCY:
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/* New output frequency */
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strength_update(value);
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break;
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}
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return 1;
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}
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/* Database entry */
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DSP_PROC_DB_ENTRY(
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AFR,
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afr_configure);
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