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DOOM Weird Sounds

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moonscapex:
After I Upgraded to rockbox 3.2, the sounds in Doom are high pitched and sound really bad.  Is there a fix for this or should I downgrade back to 3.1? ???

Thecoolgman:
Yeah I'm having the same problem on my 5G.  :(

dreamlayers:
On my 5G, Doom sounds are at the correct pitch with r20590.  However, they have a kind of crackly distortion.  Changing SAMPLECOUNT from 128 to 256 in i_sound.c improves things somewhat, so I think the distortion is due to buffer underruns (audio data is being played faster than it's delivered).  Further increases of SAMPLECOUNT don't seem to help, so a different solution is necessary.

Edit:  Sound plays fine when sample rate is set to 11025.  Resampling to 44100 is ok on the sim, so I still think the issue is underruns.

Technical info:
wm8758.c, in audiohw_set_frequency: CLKCTRL_MCLKDIV_8,  ADDCTRL_SR_12kHz
i_sound.c: #define HW_HAVE_11
(This is just a quick experiment.  It makes your music play slow and at low frequency.  Proper support for switching sample rates seems easy and is probably coming soon.)

(Edit: No need to change BCLKDIV because BCLK already depends on SYSCLOCK.  Interesting how BCLK is faster than necessary)

Edit:  I created a patch which adds support for various sample rates on the 5G iPod.  With it, I don't get any problems with sounds in Doom.  However, it doesn't address what seems to be the root cause:  sound in plugins can underrun far too easily.  BTW.  The patch also adds support for various recording sample rates.

Edit: Sound is also glitchy in Rockbox 3.1.  Did Doom sound ever work properly on the 5G iPod?

Edit: Sample rate setting was committed in r20635.  On the 5G iPod, 11 KHz is used now and there seem to be no more underruns.

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