with your changes applied, now both PCM channels have the same phase with my XFire. The stereo image makes much more sense that way :-). Thanks a lot!
What I've noticed: Switching the 'PCM Out' control from 'pre 3D' to 'post 3D' inverts the sign of both l&r channels. (behaviour is independent of '3D depth', '3D center' and '3D switch' controls). But that doesn't cause any problems, at least with stereo output (which is the only mode the XFire works for now). With >2 channel output on other cs46xx cards this could perhaps cause problems if the phase of the rear/LFE/center channels doesn't match the left/right channel phase any more. But I can't check this with my card.
@Benny:
Another problem: SPDIF input doesn't work anymore since I applied the patch attached in your mail on 11/23/02. There is no 'SPDIF ac3 mode' in alsamixer after patching. Is this correct? And I noticed that I can't change the SPDIF input volume for left and right channel independently anymore. If I move the slider for one channel, the other follows more or less. I get a maximum volume difference of 4 (on the range 0..100) between left and right SPDIF input channel. Changing the levels independently and SPDIF input worked before patching.
I reinstalled the unpatched rc6 driver but even restarting alsa didn't make SPDIF input working again (I also deleted my /etc/asound.state because the mixer controls have changed). Finally, I found out that I had to switch off my PC for several seconds and restart with the unpatched rc6 driver. The patched driver changes the state of the soundcard in some way that even reinstalling the unpatched one doesn't help without cold booting. Does SPDIF input work for other cs46xx based cards after applying the mentioned patch? What errors does this patch fix? Do I need it?
Anyway, great to have pcm output without phase reversals. Thanks again!
fe
Benny Sjostrand schrieb:
Great discovery!, probably the stream can be inverted several times when it processedthrough
it seems that volumes 0-0x7fff ramp up volumes, then 8000-ffff go back down... but with opposite phases. So...
through the SCB tree. (PCMReader->SrcTaskSCB->MasterMixSCB->CodecOut)
Almost all SCB's got a volume field.
and it sounds correct (for CD analog passthru and PCM at least).I guess that the only thing left is to change the initial volume values set when driver is loaded
(note - you'll need to open alsamixer and adjust the DAC volume before the 'fix' works, I haven't found where it gets programmed on driver load.
in dsp_spos.c line 260:
/* maximize volume */
ins->dac_volume_right = 0x8000;
- ins->dac_volume_left = 0x8000;
+ ins->dac_volume_left = 0x7fff;
ins->spdif_input_volume_right = 0x8000;
- ins->spdif_input_volume_left = 0x8000;
+ ins->spdif_input_volume_left = 0x7fff;
Now, I have no idea if this is correct, if I just broke SPDIF (no reciever), rear speakers (ditto, I don't have any) but it fixes my case anyway, so that's a start. If anyone can test more of these cases, that might be good.
If it works and solves a problem then it must correct -:)/Benny
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