[linux-audio-dev] Mute Microphone via Linux System Call

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Subject: [linux-audio-dev] Mute Microphone via Linux System Call
From: Anes Lihovac (al_AT_axxteq.de)
Date: Wed Jan 05 2000 - 12:16:02 EET

Hello !

How can I mute the microphone or volume off the mixer:
I am doing this:

Pseudo Code (more or less) !!!

int mixer; //my file descriptor
mixer=open("/dev/mixer",O_RDRW);
int vol;

if(mixer)
{

1)
        int rc;
        rc=ioctl(mixer,MIXER_WRITE(SOUND_MIXER_MIC),&vol);
            printf("Microphone setting(ZERO is okay) : %d\n" ,rc);
2)
        rc=ioctl(mixer,MIXER_WRITE(SOUND_MIXER_MIC|SOUND_MIXER_MUTE),&vol);
        printf("Microphone setting MUTE(ZERO is okay):%d\n",rc)
        //This allways fails(-1), I think the call isn' t right
3)
          vol=0;
        rc=ioctl(mixer,MIXER_WRITE(SOUND_MIXER_VOLUME),&vol);
        printf("Volume setting (ZERO IS OKAY): %d\n",rc);
            close(mixer);
}
else
{
        //Errorhandling
}

Point 1 and 3 are always okay. but the second one alway fails. I think
the call system call isn't right. If anyone knows how to do it right,
please drop a line.

Thanks in advance and best regards
Anes Lihovac

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