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Diffstat (limited to '')
-rw-r--r-- | src/mixer/SoftwareMixerPlugin.cxx | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/mixer/SoftwareMixerPlugin.cxx b/src/mixer/SoftwareMixerPlugin.cxx new file mode 100644 index 000000000..16463938f --- /dev/null +++ b/src/mixer/SoftwareMixerPlugin.cxx @@ -0,0 +1,111 @@ +/* + * 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; + + 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, +}; + +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; +} |