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spark: add volume control for alsa mixer

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Origin commit data
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Branch: master
Commit: 7cd67c9fad
Author: martii <you@example.com>
Date: 2012-09-05 (Wed, 05 Sep 2012)


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This commit was generated by Migit
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martii
2012-09-05 19:08:45 +02:00
parent b4ac2ad25e
commit e0c90be5e7
5 changed files with 114 additions and 1 deletions
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70
libspark/audio_mixer.cpp Normal file
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/*
* audio_mixer.c
*
* (C) 2012 martii
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <audio_mixer.h>
mixerVolume::mixerVolume(const char *name, const char *card, long volume) {
sid = NULL;
elem = NULL;
handle = NULL;
min = 0;
max = 100;
char cardId[10];
if (!name || !card)
return;
int cx = snd_card_get_index(card);
if (cx < 0 || cx > 31)
return;
snprintf(cardId, sizeof(cardId), "hw:%i", cx);
if (0 > snd_mixer_open(&handle, 0))
return;
if (0 > snd_mixer_attach(handle, cardId))
return;
if (0 > snd_mixer_selem_register(handle, NULL, NULL))
return;
if (0 > snd_mixer_load(handle))
return;
snd_mixer_selem_id_alloca(&sid);
if (!sid)
return;
snd_mixer_selem_id_set_index(sid, 0);
snd_mixer_selem_id_set_name(sid, name);
elem = snd_mixer_find_selem(handle, sid);
if (elem) {
snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
setVolume(volume);
}
}
mixerVolume::~mixerVolume()
{
if (handle)
snd_mixer_close(handle);
if (sid)
snd_mixer_selem_id_free(sid);
}
bool mixerVolume::setVolume(long volume) {
return elem
&& (volume > -1)
&& (volume < 101)
&& !snd_mixer_selem_set_playback_volume_all(elem, min + volume * (max - min)/101);
}