forked from len0rd/rockbox
78a45b47de
Some things can just be a bit simpler in handling the list of stages and some things, especially format change handling, can be simplified for each stage implementation. Format changes are sent through the configure() callback. Hide some internal details and variables from processing stages and let the core deal with it. Do some miscellaneous cleanup and keep things a bit better factored. Change-Id: I19dd8ce1d0b792ba914d426013088a49a52ecb7e
145 lines
4.1 KiB
C
145 lines
4.1 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) 2005 Magnus Holmgren
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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 "config.h"
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#include "system.h"
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#include "dsp-util.h"
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#include "fixedpoint.h"
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#include "fracmul.h"
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#include "dsp_proc_entry.h"
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#include "pga.h"
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/* Implemented here or in target assembly code */
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void pga_process(struct dsp_proc_entry *this, struct dsp_buffer **buf_p);
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#define DEFAULT_PGA_GAIN (PGA_UNITY >> 1) /* s8.23 format */
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static struct pga_data
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{
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int32_t gain; /* 00h: Final gain in s8.23 format */
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uint32_t enabled; /* Mask of enabled gains */
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int32_t gains[PGA_NUM_GAINS]; /* Individual gains in s7.24 format */
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} pga_data =
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{
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.gain = DEFAULT_PGA_GAIN,
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.enabled = 0,
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.gains[0 ... PGA_NUM_GAINS-1] = PGA_UNITY,
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};
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/* Combine all gains to a global gain and enable/disable the amplifier if
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the overall gain is not unity/unity */
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static void pga_update(void)
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{
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int32_t gain = PGA_UNITY;
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/* Multiply all gains with one another to get overall amp gain */
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for (int i = 0; i < PGA_NUM_GAINS; i++)
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{
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if (pga_data.enabled & BIT_N(i)) /* Only enabled gains factor in */
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gain = fp_mul(gain, pga_data.gains[i], 24);
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}
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gain >>= 1; /* s7.24 -> s8.23 format */
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if (gain == pga_data.gain)
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return;
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struct dsp_config *dsp = dsp_get_config(CODEC_IDX_AUDIO);
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pga_data.gain = gain;
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dsp_proc_enable(dsp, DSP_PROC_PGA, gain != DEFAULT_PGA_GAIN);
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dsp_proc_activate(dsp, DSP_PROC_PGA, true);
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}
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/** Amp controls **/
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/* Set a particular gain value - doesn't have to be enabled */
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void pga_set_gain(enum pga_gain_ids id, int32_t value)
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{
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if (value == pga_data.gains[id])
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return;
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pga_data.gains[id] = value;
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if (BIT_N(id) & pga_data.enabled)
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pga_update();
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}
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/* Enable or disable the specified gain stage */
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void pga_enable_gain(enum pga_gain_ids id, bool enable)
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{
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uint32_t bit = BIT_N(id);
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if (enable != !(pga_data.enabled & bit))
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return;
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pga_data.enabled ^= bit;
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pga_update();
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}
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/** DSP interface **/
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#if !defined(CPU_COLDFIRE) && !defined(CPU_ARM)
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/* Apply a constant gain to the samples (e.g., for ReplayGain). */
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void pga_process(struct dsp_proc_entry *this, struct dsp_buffer **buf_p)
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{
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int32_t gain = ((struct pga_data *)this->data)->gain;
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struct dsp_buffer *buf = *buf_p;
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unsigned int channels = buf->format.num_channels;
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for (unsigned int ch = 0; ch < channels; ch++)
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{
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int32_t *d = buf->p32[ch];
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int count = buf->remcount;
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for (int i = 0; i < count; i++)
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d[i] = FRACMUL_SHL(d[i], gain, 8);
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}
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(void)this;
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}
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#endif /* CPU */
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/* DSP message hook */
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static intptr_t pga_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)&pga_data;
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this->process = pga_process;
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break;
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}
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return 0;
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(void)dsp;
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}
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/* Database entry */
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DSP_PROC_DB_ENTRY(PGA,
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pga_configure);
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