[Alsa-user] Intel8x0 SPDIF HOWTO

[Timothy Wagner]

I need some help in understanding the proper usage of the SPDIF output 
for the Intel8x0 driver.

This works well for sending a wav file to the analog output:

	aplay -D plughw:0,0 test.wav

This works well for sending a wav file to the SPDIF output:

	aplay -D plughw:0,1 test.wav

This plays nothing at all:

	aplay test.wav

This works well for playing an mp3 file to the analog output:

	mpg321 test.mp3

This plays the same file with a lot of distortion (noise):

        mpg321 -o alsa09  --audiodevice hw:0,0 test.mp3
        mpg321 -o alsa09  --audiodevice plughw:0,0 test.mp3
This plays the same distorted audio to the SPDIF:

	mpg321 -o alsa09  --audiodevice hw:0,1 test.mp3

This exits with error:

	mpg321 -o alsa09  --audiodevice plughw:0,1 test.mp3

        ALSA snd_pcm_hw_params_set_period_size error: Invalid argument
        Can't open libao driver with device plughw:0,1
        (is device in use?)
And finally, before I recompiled ALSA for IEC958 I was able to use Xine 
without problem. Now I cannot get any sound whatsoever from Xine, in 
either analog or SPDIF.



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