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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] STe DMA sound
- From: Vincent Rivière <vincent.riviere@xxxxxxxxxxx>
- Date: Sat, 14 Apr 2018 18:56:01 +0200
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On 14/04/2018 at 18:23, Vincent Rivière wrote:
With current HG sources, I have also commented out DmaSnd_GenerateSamples()
as a test.
Result: Good YM music, no DMA digidrums, and no 7 KHz issue
It seems to indicate that the 7 KHz artifact comes from the DMA, unless I'm
mistaken...
Other test:
dmaSnd.c, line 553:
switch (microwire.mixing) {
case 1:
/* DMA and YM2149 mixing */
MixBuffer[nBufIdx][0] = MixBuffer[nBufIdx][0] /*+ dma.FrameLeft *
-((256*3/4)/4)/4*/;
break;
Note that I have commented out the DMA part (I could have simply commented
out the whole line).
Result in Lethal Xcess main menu:
YM music, no digidrums... but annoying 7 KHz artifact present!
So it seems to indicate that the noise comes from YM.
Opposite conclusion of my previous test...
I need to have a rest.
NB: The only sane possibility would be that DmaSnd_GenerateSamples() trashes
the YM sound by some side effect.
--
Vincent Rivière