Viper, sound in mono or stereo

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Hello,

I work whith a Viper from Arcom with a National audio codec LM4548AA. It
runs on Linux.

I want to record sound from a microphone in mono. It is impossible. When
I configure the sound device (/dev/dsp or /dev/audio) it's always in
stereo.

int tmp = 1;
ioctl(_devHandle, SOUND_PCM_WRITE_CHANNELS, &tmp);
printf("channels : %d\n", tmp);

=> channels : 2

I would like :
=> channels : 1

Can you help me ?

Thanks,

Bernard.

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