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f54b0e7bec
Origin commit data
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Branch: master
Commit: bc17c13de4
Author: vanhofen <vanhofen@gmx.de>
Date: 2021-05-17 (Mon, 17 May 2021)
Origin message was:
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- formatting code using astyle
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No further description and justification available within origin commit message!
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This commit was generated by Migit
72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
/*
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* audio_mixer.cpp
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*
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* (C) 2012 martii
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <audio_mixer.h>
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mixerVolume::mixerVolume(const char *name, const char *card, long volume)
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{
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snd_mixer_selem_id_t *sid = NULL;
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elem = NULL;
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handle = NULL;
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min = 0;
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max = 100;
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char cardId[10];
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if (!name || !card)
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return;
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int cx = snd_card_get_index(card);
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if (cx < 0 || cx > 31)
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return;
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snprintf(cardId, sizeof(cardId), "hw:%i", cx);
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if (0 > snd_mixer_open(&handle, 0))
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return;
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if (0 > snd_mixer_attach(handle, cardId))
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return;
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if (0 > snd_mixer_selem_register(handle, NULL, NULL))
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return;
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if (0 > snd_mixer_load(handle))
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return;
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snd_mixer_selem_id_alloca(&sid);
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if (!sid)
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return;
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snd_mixer_selem_id_set_index(sid, 0);
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snd_mixer_selem_id_set_name(sid, name);
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elem = snd_mixer_find_selem(handle, sid);
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if (elem)
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{
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snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
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setVolume(volume);
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}
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}
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mixerVolume::~mixerVolume()
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{
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if (handle)
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snd_mixer_close(handle);
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}
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bool mixerVolume::setVolume(long volume)
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{
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return elem
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&& (volume > -1)
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&& (volume < 101)
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&& !snd_mixer_selem_set_playback_volume_all(elem, min + volume * (max - min) / 100);
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}
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