2009-01-25 17:37:50 +01:00
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/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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2009-03-13 18:43:16 +01:00
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2009-01-25 17:37:50 +01:00
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*/
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2008-12-31 16:46:41 +01:00
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#include "../output_api.h"
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2009-01-04 17:35:51 +01:00
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#include "../mixer_api.h"
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2008-12-31 16:46:41 +01:00
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#include <glib.h>
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#include <alsa/asoundlib.h>
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#define VOLUME_MIXER_ALSA_DEFAULT "default"
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#define VOLUME_MIXER_ALSA_CONTROL_DEFAULT "PCM"
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struct alsa_mixer {
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2009-01-25 17:45:16 +01:00
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/** the base mixer class */
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struct mixer base;
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2008-12-31 16:46:41 +01:00
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char *device;
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char *control;
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snd_mixer_t *handle;
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snd_mixer_elem_t *elem;
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long volume_min;
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long volume_max;
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int volume_set;
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};
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2009-01-25 17:45:16 +01:00
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static struct mixer *
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2009-01-25 17:38:12 +01:00
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alsa_mixer_init(const struct config_param *param)
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2008-12-31 16:46:41 +01:00
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{
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2009-01-25 17:45:16 +01:00
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struct alsa_mixer *am = g_new(struct alsa_mixer, 1);
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mixer_init(&am->base, &alsa_mixer);
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2009-01-25 17:38:12 +01:00
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am->device = config_dup_block_string(param, "mixer_device", NULL);
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am->control = config_dup_block_string(param, "mixer_control", NULL);
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2008-12-31 16:46:41 +01:00
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am->handle = NULL;
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am->elem = NULL;
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am->volume_min = 0;
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am->volume_max = 0;
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am->volume_set = -1;
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2009-01-25 17:38:12 +01:00
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2009-01-25 17:45:16 +01:00
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return &am->base;
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2008-12-31 16:46:41 +01:00
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}
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2009-01-10 17:53:33 +01:00
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static void
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2009-01-25 17:45:16 +01:00
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alsa_mixer_finish(struct mixer *data)
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2008-12-31 16:46:41 +01:00
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{
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2009-01-10 17:53:33 +01:00
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struct alsa_mixer *am = (struct alsa_mixer *)data;
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2009-01-18 18:55:51 +01:00
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g_free(am->device);
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g_free(am->control);
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2008-12-31 16:46:41 +01:00
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g_free(am);
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}
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2009-01-10 17:53:33 +01:00
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static void
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2009-01-25 17:45:16 +01:00
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alsa_mixer_close(struct mixer *data)
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2008-12-31 16:46:41 +01:00
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{
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2009-01-10 17:53:33 +01:00
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struct alsa_mixer *am = (struct alsa_mixer *)data;
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2008-12-31 16:46:41 +01:00
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if (am->handle) snd_mixer_close(am->handle);
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am->handle = NULL;
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}
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2009-01-10 17:53:33 +01:00
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static bool
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2009-01-25 17:45:16 +01:00
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alsa_mixer_open(struct mixer *data)
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2008-12-31 16:46:41 +01:00
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{
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2009-01-10 17:53:33 +01:00
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struct alsa_mixer *am = (struct alsa_mixer *)data;
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2008-12-31 16:46:41 +01:00
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int err;
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snd_mixer_elem_t *elem;
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const char *control_name = VOLUME_MIXER_ALSA_CONTROL_DEFAULT;
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const char *device = VOLUME_MIXER_ALSA_DEFAULT;
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if (am->device) {
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device = am->device;
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}
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err = snd_mixer_open(&am->handle, 0);
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snd_config_update_free_global();
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if (err < 0) {
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g_warning("problems opening alsa mixer: %s\n", snd_strerror(err));
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return false;
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}
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if ((err = snd_mixer_attach(am->handle, device)) < 0) {
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g_warning("problems attaching alsa mixer: %s\n",
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snd_strerror(err));
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2009-01-10 17:53:33 +01:00
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alsa_mixer_close(data);
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2008-12-31 16:46:41 +01:00
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return false;
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}
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if ((err = snd_mixer_selem_register(am->handle, NULL,
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NULL)) < 0) {
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g_warning("problems snd_mixer_selem_register'ing: %s\n",
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snd_strerror(err));
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2009-01-10 17:53:33 +01:00
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alsa_mixer_close(data);
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2008-12-31 16:46:41 +01:00
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return false;
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}
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if ((err = snd_mixer_load(am->handle)) < 0) {
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g_warning("problems snd_mixer_selem_register'ing: %s\n",
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snd_strerror(err));
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2009-01-10 17:53:33 +01:00
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alsa_mixer_close(data);
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2008-12-31 16:46:41 +01:00
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return false;
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}
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elem = snd_mixer_first_elem(am->handle);
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if (am->control) {
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control_name = am->control;
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}
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while (elem) {
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if (snd_mixer_elem_get_type(elem) == SND_MIXER_ELEM_SIMPLE) {
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if (strcasecmp(control_name,
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snd_mixer_selem_get_name(elem)) == 0) {
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break;
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}
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}
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elem = snd_mixer_elem_next(elem);
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}
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if (elem) {
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am->elem = elem;
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snd_mixer_selem_get_playback_volume_range(am->elem,
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&am->volume_min,
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&am->volume_max);
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return true;
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}
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g_warning("can't find alsa mixer control \"%s\"\n", control_name);
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2009-01-10 17:53:33 +01:00
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alsa_mixer_close(data);
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2008-12-31 16:46:41 +01:00
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return false;
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}
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2009-02-16 01:39:52 +01:00
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static int
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alsa_mixer_get_volume(struct mixer *mixer)
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2008-12-31 16:46:41 +01:00
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{
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2009-02-16 01:39:52 +01:00
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struct alsa_mixer *am = (struct alsa_mixer *)mixer;
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int err;
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int ret;
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long level;
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if (am->handle == NULL && !alsa_mixer_open(mixer))
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return -1;
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err = snd_mixer_handle_events(am->handle);
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if (err < 0) {
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g_warning("problems getting alsa volume: %s (snd_mixer_%s)\n",
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snd_strerror(err), "handle_events");
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alsa_mixer_close(mixer);
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return false;
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2008-12-31 16:46:41 +01:00
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}
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2009-02-16 01:39:52 +01:00
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err = snd_mixer_selem_get_playback_volume(am->elem,
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SND_MIXER_SCHN_FRONT_LEFT,
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&level);
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if (err < 0) {
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g_warning("problems getting alsa volume: %s (snd_mixer_%s)\n",
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snd_strerror(err), "selem_get_playback_volume");
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alsa_mixer_close(mixer);
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return false;
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2008-12-31 16:46:41 +01:00
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}
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2009-02-16 01:39:52 +01:00
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ret = ((am->volume_set / 100.0) * (am->volume_max - am->volume_min)
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+ am->volume_min) + 0.5;
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if (am->volume_set > 0 && ret == level) {
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ret = am->volume_set;
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} else {
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ret = (int)(100 * (((float)(level - am->volume_min)) /
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(am->volume_max - am->volume_min)) + 0.5);
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2008-12-31 16:46:41 +01:00
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}
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2009-02-16 01:39:52 +01:00
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return ret;
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}
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static bool
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alsa_mixer_set_volume(struct mixer *mixer, unsigned volume)
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{
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struct alsa_mixer *am = (struct alsa_mixer *)mixer;
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float vol;
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long level;
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int err;
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if (am->handle == NULL && !alsa_mixer_open(mixer))
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return false;
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vol = volume;
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am->volume_set = vol + 0.5;
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am->volume_set = am->volume_set > 100
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? 100 :
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(am->volume_set < 0
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? 0 : am->volume_set);
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level = (long)(((vol / 100.0) * (am->volume_max - am->volume_min) +
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am->volume_min) + 0.5);
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level = level > am->volume_max ? am->volume_max : level;
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level = level < am->volume_min ? am->volume_min : level;
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err = snd_mixer_selem_set_playback_volume_all(am->elem, level);
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if (err < 0) {
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g_warning("problems setting alsa volume: %s\n",
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snd_strerror(err));
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alsa_mixer_close(mixer);
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return false;
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}
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return true;
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2008-12-31 16:46:41 +01:00
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}
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2009-01-10 17:53:33 +01:00
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2009-01-25 17:37:52 +01:00
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const struct mixer_plugin alsa_mixer = {
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2009-01-10 17:53:33 +01:00
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.init = alsa_mixer_init,
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.finish = alsa_mixer_finish,
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.open = alsa_mixer_open,
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2009-02-16 01:39:52 +01:00
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.close = alsa_mixer_close,
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.get_volume = alsa_mixer_get_volume,
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.set_volume = alsa_mixer_set_volume,
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2009-01-10 17:53:33 +01:00
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};
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