/* * Copyright (C) 2003-2009 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 "software_mixer_plugin.h" #include "mixer_api.h" #include "filter_plugin.h" #include "filter_registry.h" #include "filter/volume_filter_plugin.h" #include "pcm_volume.h" #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 = { .init = software_mixer_init, .finish = software_mixer_finish, .get_volume = software_mixer_get_volume, .set_volume = software_mixer_set_volume, .global = 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; }