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

New Message Reply About this list Date view Thread view Subject view Author view Other groups

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

New Message Reply About this list Date view Thread view Subject view Author view Other groups

This archive was generated by hypermail 2b28 : Sat Apr 07 2001 - 15:25:41 EEST