From: Lee Revell <rlrevell@joe-job.com>
To: Takashi Iwai <tiwai@suse.de>
Cc: alsa-devel@lists.sourceforge.net
Subject: Re: Driver design question
Date: Wed, 27 Sep 2006 13:38:25 -0400 [thread overview]
Message-ID: <1159378705.1275.28.camel@mindpipe> (raw)
In-Reply-To: <s5hhcytp6sy.wl%tiwai@suse.de>
On Wed, 2006-09-27 at 19:18 +0200, Takashi Iwai wrote:
>
> Well, when you have an intermediate buffer (allocated via
> snd_pcm_lib_malloc(), you don't need copy and silent callbacks. The
> data is written on the intermediate buffer. Then, the workq copies
> the data again from this buffer to the hardware in the background.
>
> As I mentioned, the helpers in pcm-indirect.h might make things eaiser
> for such an implementation. In your case, a pseudo code would look
> like below.
>
Takashi-san,
Thanks very much! I'll give these recommendations a try.
I am very glad that the ALSA driver API can handle such a weird hardware
PCM implementation. Keep up the good work!
Lee
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next prev parent reply other threads:[~2006-09-27 17:38 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-14 11:29 Driver design question Takashi Iwai
2006-09-15 14:47 ` Lee Revell
2006-09-19 15:15 ` Takashi Iwai
2006-09-25 19:54 ` Lee Revell
2006-09-27 17:18 ` Takashi Iwai
2006-09-27 17:38 ` Lee Revell [this message]
2006-09-30 2:03 ` Lee Revell
2006-10-03 15:35 ` Lee Revell
2006-10-04 9:17 ` Takashi Iwai
2006-10-19 22:12 ` Lee Revell
2006-10-20 12:55 ` Takashi Iwai
2006-10-20 20:12 ` Lee Revell
2006-10-23 13:09 ` Takashi Iwai
2006-10-23 17:46 ` Lee Revell
2006-10-24 15:01 ` Takashi Iwai
2006-10-24 15:30 ` Lee Revell
2006-10-24 23:54 ` Lee Revell
2006-10-04 9:07 ` Takashi Iwai
2006-09-27 13:58 ` Lee Revell
2006-09-27 16:52 ` Takashi Iwai
-- strict thread matches above, loose matches on Subject: below --
2013-10-22 7:02 Driver Design Question Johannes Thumshirn
2013-10-23 3:10 ` Guenter Roeck
2013-10-23 7:29 ` Johannes Thumshirn
2006-09-12 20:27 Driver design question Lee Revell
2005-05-19 6:24 driver " Jean Delvare
2005-05-19 6:24 ` Jean Delvare
2005-05-19 6:24 ` Philip Edelbrock
2005-05-19 6:24 ` Philip Edelbrock
2005-05-19 6:24 ` Jean Delvare
2005-05-19 6:24 ` Philip Edelbrock
2005-05-19 6:24 ` Mark M. Hoffman
2005-05-19 6:24 ` Philip Pokorny
2005-05-19 6:24 ` Jean Delvare
2005-05-19 6:24 ` Mark D. Studebaker
2005-05-19 6:24 ` Philip Pokorny
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