Thomas Tonino wrote:
> The option "IEC958 Output Switch" indeed neatly enables the digital
> output with a quiet signal. When I enable the "IEC958 DAC To Out"
> switch I get very distorted output. I'm using XMMS or MPG123 with OSS
> emulation.
<cut more data>
I started playing around in the driver with some success. When line 1211
of card-cmipci.c is changed to accept unsigned samples instead of
signed, the SPDIF output is fine, but expected, the analog output is now
unusable. See below:
/* playback on channel A */
static snd_pcm_hardware_t snd_cmipci_playback =
{
info: (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP_VALID),
formats: SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_U16_LE,
rates: SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_48000,
rate_min: 5512,
I hope this information sheds some light as to where the problem lies.
As I understand, people are using the 0.9.0beta10 driver successfully
with SPDIF out on the CM8738? Could that be a matter of chip revision
then? If interest exists, I'll pull the card from my system to look at
manufacturing date.
The above S16 to U16 change both fixes SPDIF output with the IEC958 DAC
To Out option in alsamixer and using the SPDIF device directly through
alsaplayer -d hw:0,2.
I hope this points in a direction that will solve this problem in the
right place of the code. FWIW the Windows driver is able to use both
outputs correctly...
Thomas
p.s. cc'ed this to alsa-devel - I think it really belongs there -
followups can go there too.
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