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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "SoftwareMixerPlugin.hxx"
#include "mixer_api.h"
#include "FilterPlugin.hxx"
#include "FilterRegistry.hxx"
#include "filter/VolumeFilterPlugin.hxx"
#include "PcmVolume.hxx"
#include <assert.h>
#include <math.h>
struct software_mixer {
/** the base mixer class */
struct mixer base;
struct filter *filter;
unsigned volume;
};
static struct mixer *
software_mixer_init(G_GNUC_UNUSED void *ao,
G_GNUC_UNUSED const struct config_param *param,
G_GNUC_UNUSED GError **error_r)
{
struct software_mixer *sm = g_new(struct software_mixer, 1);
mixer_init(&sm->base, &software_mixer_plugin);
sm->filter = filter_new(&volume_filter_plugin, NULL, NULL);
assert(sm->filter != NULL);
sm->volume = 100;
return &sm->base;
}
static void
software_mixer_finish(struct mixer *data)
{
struct software_mixer *sm = (struct software_mixer *)data;
g_free(sm);
}
static int
software_mixer_get_volume(struct mixer *mixer, G_GNUC_UNUSED GError **error_r)
{
struct software_mixer *sm = (struct software_mixer *)mixer;
return sm->volume;
}
static bool
software_mixer_set_volume(struct mixer *mixer, unsigned volume,
G_GNUC_UNUSED GError **error_r)
{
struct software_mixer *sm = (struct software_mixer *)mixer;
assert(volume <= 100);
sm->volume = volume;
if (volume >= 100)
volume = PCM_VOLUME_1;
else if (volume > 0)
volume = pcm_float_to_volume((exp(volume / 25.0) - 1) /
(54.5981500331F - 1));
volume_filter_set(sm->filter, volume);
return true;
}
const struct mixer_plugin software_mixer_plugin = {
software_mixer_init,
software_mixer_finish,
nullptr,
nullptr,
software_mixer_get_volume,
software_mixer_set_volume,
true,
};
struct filter *
software_mixer_get_filter(struct mixer *mixer)
{
struct software_mixer *sm = (struct software_mixer *)mixer;
assert(sm->base.plugin == &software_mixer_plugin);
return sm->filter;
}
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