[linux-audio-dev] Re: [CUD] Csound & ALSA support: a call for assistance

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Subject: [linux-audio-dev] Re: [CUD] Csound & ALSA support: a call for assistance
From: Markus Gruber (gruber_AT_eikon.tum.de)
Date: Wed Sep 13 2000 - 12:17:00 EEST

dlphilp_AT_bright.net said:
> Markus, thank you for sending your code. I compiled the streams
> version into the latest unofficial Csound, and at last I have native
> ALSA support ! But of course there's a problem... ;)

> First, the setup: the two cards are SoundBlasters, one is a Live!
> Value and the other is a PCI128. They are each properly configured and
> working under the ALSA 0.5.9b package.

> In the following csd file the SBLive is the incard and the PCI128 is
> the outcard:

> <CsoundSynthesizer>

> <CsOptions> ; testing the ALSA support --incard=0 --outcard=1 -WNdm6 </
> CsOptions>

> <CsInstruments>

> sr = 44100 kr = 4410 ksmps = 10 nchnls
> = 1

> instr 1 asig in aout reverb asig,1.5
> out aout
> endin

> </CsInstruments>

> <CsScore> i1 0 10000 e </CsScore>

> </CsoundSynthesizer>

> I ran a cassette tape feed into the Live and adjusted values on the
> mixers for the cards. The Live has an Input Gain slider: it must be
> active before the processed sound can be heard, and the Master volume
> sliders for each card can be adjusted for the mix of wet/dry. The
> problem I run into is perhaps buffer-related: the processing sounds
> choppy,

Is the CPU working at 100% ??

> so I'll play with buffer settings to see how I can improve
> output.

Hm, that does not help anything in stream mode. What you can try is to edit
the time in the udelay() calls (in the code).

Markus

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