d37bf24d90
Replaces the NATIVE_FREQUENCY constant with a configurable frequency. The user may select 48000Hz if the hardware supports it. The default is still 44100Hz and the minimum is 44100Hz. The setting is located in the playback settings, under "Frequency". "Frequency" was duplicated in english.lang for now to avoid having to fix every .lang file for the moment and throwing everything out of sync because of the new play_frequency feature in features.txt. The next cleanup should combine it with the one included for recording and generalize the ID label. If the hardware doesn't support 48000Hz, no setting will be available. On particular hardware where very high rates are practical and desireable, the upper bound can be extended by patching. The PCM mixer can be configured to play at the full hardware frequency range. The DSP core can configure to the hardware minimum up to the maximum playback setting (some buffers must be reserved according to the maximum rate). If only 44100Hz is supported or possible on a given target for playback, using the DSP and mixer at other samperates is possible if the hardware offers them. Change-Id: I6023cf0c0baa8bc6292b6919b4dd3618a6a25622 Reviewed-on: http://gerrit.rockbox.org/479 Reviewed-by: Michael Sevakis <jethead71@rockbox.org> Tested-by: Michael Sevakis <jethead71@rockbox.org>
132 lines
4 KiB
C
132 lines
4 KiB
C
/***************************************************************************
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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) 2007 Thom Johansen
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* Copyright (C) 2012 Michael Sevakis
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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 "rbcodecconfig.h"
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#include "platform.h"
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#include "fixedpoint.h"
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#include "dsp_proc_entry.h"
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#include "dsp_filter.h"
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#include "tone_controls.h"
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#include "dsp_misc.h"
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/* These apply to all DSP streams to remain as consistant as possible with
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* the behavior of hardware tone controls */
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/* Cutoffs in HZ - not adjustable for now */
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static const unsigned int tone_bass_cutoff = 200;
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static const unsigned int tone_treble_cutoff = 3500;
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/* Current bass and treble gain values */
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static int tone_bass = 0;
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static int tone_treble = 0;
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/* Current prescaler setting */
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static int tone_prescale = 0;
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/* Data for each DSP */
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static struct dsp_filter tone_filters[DSP_COUNT] IBSS_ATTR;
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static void update_filter(int id, unsigned int fout)
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{
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filter_bishelf_coefs(fp_div(tone_bass_cutoff, fout, 32),
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fp_div(tone_treble_cutoff, fout, 32),
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tone_bass, tone_treble, -tone_prescale,
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&tone_filters[id]);
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}
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/* Update the filters' coefficients based upon the bass/treble settings */
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void tone_set_prescale(int prescale)
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{
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int bass = tone_bass;
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int treble = tone_treble;
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tone_prescale = prescale;
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struct dsp_config *dsp;
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for (int i = 0; (dsp = dsp_get_config(i)); i++)
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{
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update_filter(i, dsp_get_output_frequency(dsp));
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bool enable = bass != 0 || treble != 0;
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dsp_proc_enable(dsp, DSP_PROC_TONE_CONTROLS, enable);
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if (enable && !dsp_proc_active(dsp, DSP_PROC_TONE_CONTROLS))
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{
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filter_flush(&tone_filters[i]); /* Going online */
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dsp_proc_activate(dsp, DSP_PROC_TONE_CONTROLS, true);
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}
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}
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}
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/* Prescaler is always set after setting bass/treble, so we wait with
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* calculating coefs until such time. */
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/* Change the bass setting */
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void tone_set_bass(int bass)
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{
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tone_bass = bass;
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}
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/* Change the treble setting */
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void tone_set_treble(int treble)
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{
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tone_treble = treble;
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}
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/* Apply the tone control filter in-place */
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static void tone_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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filter_process((struct dsp_filter *)this->data, buf->p32, buf->remcount,
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buf->format.num_channels);
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}
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/* DSP message hook */
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static intptr_t tone_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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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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break; /* Already enabled */
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this->data = (intptr_t)&tone_filters[dsp_get_id(dsp)];
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this->process = tone_process;
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/* Fall-through */
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case DSP_FLUSH:
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filter_flush((struct dsp_filter *)this->data);
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break;
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case DSP_SET_OUT_FREQUENCY:
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update_filter(dsp_get_id(dsp), value);
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break;
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}
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return 0;
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}
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/* Database entry */
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DSP_PROC_DB_ENTRY(TONE_CONTROLS,
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tone_configure);
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