/* * 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 "../output_api.h" #include "../mixer_api.h" #include <glib.h> #include <alsa/asoundlib.h> #define VOLUME_MIXER_ALSA_DEFAULT "default" #define VOLUME_MIXER_ALSA_CONTROL_DEFAULT "PCM" struct alsa_mixer { /** the base mixer class */ struct mixer base; const char *device; const char *control; snd_mixer_t *handle; snd_mixer_elem_t *elem; long volume_min; long volume_max; int volume_set; }; static struct mixer * alsa_mixer_init(const struct config_param *param) { struct alsa_mixer *am = g_new(struct alsa_mixer, 1); mixer_init(&am->base, &alsa_mixer); am->device = config_get_block_string(param, "mixer_device", VOLUME_MIXER_ALSA_DEFAULT); am->control = config_get_block_string(param, "mixer_control", VOLUME_MIXER_ALSA_CONTROL_DEFAULT); return &am->base; } static void alsa_mixer_finish(struct mixer *data) { struct alsa_mixer *am = (struct alsa_mixer *)data; g_free(am); } static void alsa_mixer_close(struct mixer *data) { struct alsa_mixer *am = (struct alsa_mixer *)data; assert(am->handle != NULL); snd_mixer_close(am->handle); } static bool alsa_mixer_open(struct mixer *data) { struct alsa_mixer *am = (struct alsa_mixer *)data; int err; snd_mixer_elem_t *elem; am->volume_set = -1; err = snd_mixer_open(&am->handle, 0); snd_config_update_free_global(); if (err < 0) { g_warning("problems opening alsa mixer: %s\n", snd_strerror(err)); return false; } if ((err = snd_mixer_attach(am->handle, am->device)) < 0) { g_warning("problems attaching alsa mixer: %s\n", snd_strerror(err)); alsa_mixer_close(data); return false; } if ((err = snd_mixer_selem_register(am->handle, NULL, NULL)) < 0) { g_warning("problems snd_mixer_selem_register'ing: %s\n", snd_strerror(err)); alsa_mixer_close(data); return false; } if ((err = snd_mixer_load(am->handle)) < 0) { g_warning("problems snd_mixer_selem_register'ing: %s\n", snd_strerror(err)); alsa_mixer_close(data); return false; } elem = snd_mixer_first_elem(am->handle); while (elem) { if (snd_mixer_elem_get_type(elem) == SND_MIXER_ELEM_SIMPLE) { if (strcasecmp(am->control, snd_mixer_selem_get_name(elem)) == 0) { break; } } elem = snd_mixer_elem_next(elem); } if (elem) { am->elem = elem; snd_mixer_selem_get_playback_volume_range(am->elem, &am->volume_min, &am->volume_max); return true; } g_warning("can't find alsa mixer control \"%s\"\n", am->control); alsa_mixer_close(data); return false; } static int alsa_mixer_get_volume(struct mixer *mixer) { struct alsa_mixer *am = (struct alsa_mixer *)mixer; int err; int ret; long level; assert(am->handle != NULL); err = snd_mixer_handle_events(am->handle); if (err < 0) { g_warning("problems getting alsa volume: %s (snd_mixer_%s)\n", snd_strerror(err), "handle_events"); return false; } err = snd_mixer_selem_get_playback_volume(am->elem, SND_MIXER_SCHN_FRONT_LEFT, &level); if (err < 0) { g_warning("problems getting alsa volume: %s (snd_mixer_%s)\n", snd_strerror(err), "selem_get_playback_volume"); return false; } ret = ((am->volume_set / 100.0) * (am->volume_max - am->volume_min) + am->volume_min) + 0.5; if (am->volume_set > 0 && ret == level) { ret = am->volume_set; } else { ret = (int)(100 * (((float)(level - am->volume_min)) / (am->volume_max - am->volume_min)) + 0.5); } return ret; } static bool alsa_mixer_set_volume(struct mixer *mixer, unsigned volume) { struct alsa_mixer *am = (struct alsa_mixer *)mixer; float vol; long level; int err; assert(am->handle != NULL); vol = volume; am->volume_set = vol + 0.5; level = (long)(((vol / 100.0) * (am->volume_max - am->volume_min) + am->volume_min) + 0.5); level = level > am->volume_max ? am->volume_max : level; level = level < am->volume_min ? am->volume_min : level; err = snd_mixer_selem_set_playback_volume_all(am->elem, level); if (err < 0) { g_warning("problems setting alsa volume: %s\n", snd_strerror(err)); return false; } return true; } const struct mixer_plugin alsa_mixer = { .init = alsa_mixer_init, .finish = alsa_mixer_finish, .open = alsa_mixer_open, .close = alsa_mixer_close, .get_volume = alsa_mixer_get_volume, .set_volume = alsa_mixer_set_volume, .global = true, };