C++ (Cpp) snd_mixer_group_write 예제들

예제 #1

파일: alsapmo.cpp 프로젝트: mayhem/freeamp

void AlsaPMO::SetVolume(int32 left, int32 right)
{
   int   err;
   snd_mixer_t *pMixer;

   err = snd_mixer_open(&pMixer, m_iCard, 0);
   if (err < 0)
      return;

   if (m_iChannel >= 0)
   {
      err = snd_mixer_group_read(pMixer, &m_group);
      if (err < 0)
         return;

      left = (int)((double)(m_group.max - m_group.min) * 
               (double)left * 0.01) + m_group.min;
      right = (int)((double)(m_group.max - m_group.min) * 
               (double)right * 0.01) + m_group.min;
      for (int chn = 0; chn <= SND_MIXER_CHN_LAST; chn++) {
          if (!(m_group.channels & (1<<chn)))
              continue;

          if (chn == 0)
              m_group.volume.values[chn] = left;
          else
          if (chn == 1)
              m_group.volume.values[chn] = right;
          else
              m_group.volume.values[chn] = (left + right) / 2;
      }
      snd_mixer_group_write(pMixer, &m_group);
   }
   snd_mixer_close(pMixer);
} 

예제 #2

파일: audiopcm.c 프로젝트: brycepfrimmer/Core-Native-Community-Samples

void setVolume(int level)
{
    int volume;
    snd_mixer_t *mixer_handle;

    if (snd_mixer_open (&mixer_handle, card, device) < 0) {
        slogf( _SLOG_SETCODE(_SLOGC_AUDIO, 0), _SLOG_CRITICAL, "Unable to open mixer\n");
        return;
    }

    snd_mixer_group_read(mixer_handle, &group);

    volume = (float)(group.max - group.min) * ( level / 100.0) + group.min;

    if (group.channels & SND_MIXER_CHN_MASK_FRONT_LEFT)
        group.volume.names.front_left = volume;
    if (group.channels & SND_MIXER_CHN_MASK_REAR_LEFT)
        group.volume.names.rear_left = volume;
    if (group.channels & SND_MIXER_CHN_MASK_FRONT_CENTER)
        group.volume.names.front_center = volume;
    if (group.channels & SND_MIXER_CHN_MASK_FRONT_RIGHT)
        group.volume.names.front_right = volume;
    if (group.channels & SND_MIXER_CHN_MASK_REAR_RIGHT)
        group.volume.names.rear_right = volume;
    if (group.channels & SND_MIXER_CHN_MASK_WOOFER)
        group.volume.names.woofer = volume;
    snd_mixer_group_write(mixer_handle, &group);

    snd_mixer_close (mixer_handle);
}

예제 #3

파일: auddev_oss.c 프로젝트: BackupTheBerlios/bonephone

static void
alsa_mute_mic(audio_desc_t ad)
{
	snd_mixer_gid_t mic;
	snd_mixer_group_t group;
	snd_mixer_t *CurMixer = 0;

	snd_mixer_open(&CurMixer, ad, 0);	/* assume mixer 0 */
	memset(&mic, 0, sizeof(mic));
	strcpy(mic.name, SND_MIXER_IN_MIC);
	memset(&group, 0, sizeof(group));
	group.gid = mic;
	snd_mixer_group_read(CurMixer, &group);
	group.mute = SND_MIXER_CHN_MASK_STEREO;
	snd_mixer_group_write(CurMixer, &group);
	snd_mixer_close(CurMixer);
}