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Rockbox mail archiveSubject: Re: FS#11232: software mixerRe: FS#11232: software mixer
From: Thomas Martitz <thomas.martitz_at_student.htw-berlin.de>
Date: Sun, 02 May 2010 21:22:37 +0200 Am 02.05.2010 20:11, schrieb Jeff Goode: > > On 5/2/2010 14:03, Jeff Goode wrote: >> On 5/2/2010 04:44, Jens Arnold wrote: >>> On 01.05.2010, Jeff Goode wrote: >>> >>>> I'd like to know if there's some way to force SDL to behave >>>> like a target, with a very small FIFO buffer rather than >>>> its own large playback buffer, or at least not always >>>> insist on its being full. Ideas? >>> Perhaps just make the mix buffer larger for the sim? >>> >>> I have no real idea how to get around this while keeping SDL >>> (and hence portability). >> I think you're right about this and I'm going to give that a try >> next. The sim audio driver still won't "DMA" like a target but at >> least it ought to fill the buffer as SDL expects. Latency will >> skyrocket though. Instead of 23 ms tops it'll be more like 250 ms. >> I guess this isn't a problem as long as we're just using the sim to >> test code, but it might if we're going to use it as a basis for >> Rockbox-as-app. In that instance, the Rockbox mixer code would have >> to be thrown out in favor of SDL mixer or some other library function. > > I just thought of another implication. If the Rockbox mixer has to be > disabled later for the sim or Rockbox-as-app in favor of a library > function, that would imply that some of the mixer code (such as the > mixer ISR callback) doesn't belong in pcmbuf, but lower down toward > the driver level, perhaps in pcm.c. Code in pcmbuf really ought not > be target specific. Actually, neither should pcm.c but it's closer to > the hardware level. I'm a bit conflicted here. Either way it's > bloody mess. > > Jeff > Don't think about the future too much. You could invent some #defines, but just don't worry about RaaA too much :) Best regards. Received on 2010-05-02 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |