mirror of
https://github.com/tuxbox-neutrino/libstb-hal.git
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91 lines
3.4 KiB
C++
91 lines
3.4 KiB
C++
/*
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* audio_mixer.c
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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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#include <dlfcn.h>
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mixerVolume::mixerVolume(const char *name, const char *card, long volume) {
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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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alsaLib = dlopen("/lib/libasound.so.2", RTLD_NOW);
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if (!alsaLib)
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return;
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if (!(this->snd_card_get_index = (int (*)(const char *))dlsym(alsaLib, "snd_card_get_index"))
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|| !(this->snd_mixer_open = (int (*)(snd_mixer_t **, int)) dlsym(alsaLib, "snd_mixer_open"))
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|| !(this->snd_mixer_attach = (int (*)(snd_mixer_t *, const char *)) dlsym(alsaLib, "snd_mixer_attach"))
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|| !(this->snd_mixer_selem_register = (int (*)(snd_mixer_t *, struct snd_mixer_selem_regopt *, snd_mixer_class_t **)) dlsym(alsaLib, "snd_mixer_selem_register"))
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|| !(this->snd_mixer_load = (int (*)(snd_mixer_t *)) dlsym(alsaLib, "snd_mixer_load"))
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|| !(this->snd_mixer_selem_id_set_index = (void (*)(snd_mixer_selem_id_t *, unsigned int)) dlsym(alsaLib, "snd_mixer_selem_id_set_index"))
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|| !(this->snd_mixer_selem_id_set_name = (void (*)(snd_mixer_selem_id_t *, const char *)) dlsym(alsaLib, "snd_mixer_selem_id_set_name"))
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|| !(this->snd_mixer_find_selem = (snd_mixer_elem_t *(*)(snd_mixer_t *, const snd_mixer_selem_id_t *)) dlsym(alsaLib, "snd_mixer_find_selem"))
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|| !(this->snd_mixer_selem_get_playback_volume_range = (int (*)(snd_mixer_elem_t *, long *, long *)) dlsym(alsaLib, "snd_mixer_selem_get_playback_volume_range"))
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|| !(this->snd_mixer_close = (int (*)(snd_mixer_t *)) dlsym(alsaLib, "snd_mixer_close"))
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|| !(this->snd_mixer_selem_id_free = (void (*)(snd_mixer_selem_id_t *)) dlsym(alsaLib, "snd_mixer_selem_id_free"))
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|| !(this->snd_mixer_selem_set_playback_volume_all = (int (*)(snd_mixer_elem_t *, long)) dlsym(alsaLib, "snd_mixer_selem_set_playback_volume_all")))
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return;
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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 > this->snd_mixer_open(&handle, 0))
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return;
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if (0 > this->snd_mixer_attach(handle, cardId))
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return;
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if (0 > this->snd_mixer_selem_register(handle, NULL, NULL))
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return;
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if (0 > this->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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this->snd_mixer_selem_id_set_index(sid, 0);
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this->snd_mixer_selem_id_set_name(sid, name);
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elem = this->snd_mixer_find_selem(handle, sid);
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if (elem) {
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this->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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this->snd_mixer_close(handle);
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if (sid)
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this->snd_mixer_selem_id_free(sid);
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if (alsaLib)
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dlclose(alsaLib);
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}
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bool mixerVolume::setVolume(long volume) {
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return elem
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&& (volume > -1)
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&& (volume < 101)
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&& !this->snd_mixer_selem_set_playback_volume_all(elem, min + volume * (max - min)/100);
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}
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