From: "Iain Sandoe" <iain@sandoe.co.uk>
To: Benjamin Herrenschmidt <bh40@calva.net>,
Henry Worth <haworth@ncal.verio.com>,
linuxppc-dev@lists.linuxppc.org
Subject: Re: CDDA playback on Pismo (and other newer models)
Date: Fri, 04 Aug 2000 14:05:11 +0100 [thread overview]
Message-ID: <200008041305.OAA01797@hyperion.valhalla.net> (raw)
[...]
>>From the the drive's spin-up sounds it seems to always be in
>>high-speed mode, but unlike the ATAPI driver, there is little
>>head movement noise.
>
> I think the problem is more with cdparanoia. I think it's more or less
> synchronous, it doesn't have a thread that collects datas while another
> outputs sounds. I've looked at cdparanoia sources some time ago, and I
> think and intermediate step of buffering is necessary.
>From my IRQ latency measurements I would think that there was *no* chance
without the intermediate step. On my Lombard, CD access over IDE can mask
IRQs for 2 >>ms<<< which also means you need to make sure the audio frag
sizes are sensible as well... i.e. don't try 2 frags of 256 bytes - it won't
work as things stand.
Iain.
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next reply other threads:[~2000-08-04 13:05 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-08-04 13:05 Iain Sandoe [this message]
-- strict thread matches above, loose matches on Subject: below --
2000-08-08 22:19 CDDA playback on Pismo (and other newer models) Henry Worth
2000-08-07 19:35 Iain Sandoe
2000-08-07 21:49 ` Henry Worth
2000-08-07 9:03 Iain Sandoe
2000-08-07 19:18 ` Henry Worth
2000-08-08 5:02 ` Takashi Oe
2000-08-08 7:01 ` Henry Worth
2000-08-06 21:07 Henry Worth
2000-08-06 9:38 Iain Sandoe
2000-08-06 13:26 ` Takashi Oe
2000-08-06 18:36 ` Henry Worth
2000-08-07 1:25 ` Takashi Oe
2000-08-07 5:02 ` Henry Worth
2000-08-04 12:57 Benjamin Herrenschmidt
2000-08-04 9:16 Iain Sandoe
2000-08-04 20:40 ` Henry Worth
2000-08-04 21:03 ` Benjamin Herrenschmidt
2000-08-06 8:09 ` Henry Worth
2000-08-04 5:18 Henry Worth
2000-08-04 9:50 ` Michel Dänzer
2000-08-04 15:56 ` Nelson Abramson
2000-08-04 19:45 ` Henry Worth
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