On Thu, 11 Mar 2004, James Courtier-Dutton wrote:Yes, I tried all sorts of combinations.
Which devices can a mono stream be played on?
It seems that the only device a mono stream can be played on is the "default" pcm device.
Devices like "front" and "rear" are stereo only devices.
It would be nice if alsa-lib would open one of these devices, and if the application tries to set 1 channel instead of 2, then somehow make alsa-lib do the duplication of the channels.
A similar thing should happen for "surround40" device. If 1 channel is asked for, alsa-lib should duplicate it for all channels. If 2 channels are asked for, then alsa-lib should create 4 channels automatically.
alsa-lib seems to manage to do this sort of thing for sample rates, and sample formats, why not number of channels ?
Have you tried 'plug:front' combination ;-)
Jaroslav
When I play a mono stream to the "front" or "rear" device I get no sound at all, but the hw_params for 1 channel is accepted, so my application thinks it should work.
This has been tested with aplay.
The sample file used was recorded with the command: -
arecord -fS16_LE -c1 -r48000 test1.wav
and played back with: -
aplay -Dfront test1.wav
Playing WAVE 'test1.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
Cheers James
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