[alsa-devel] Is Asoc suitable for my device?
hi all: I'm new to ALSA and still study it. My problem is I don't know if it suitable for my device use Asoc. In my platform, there is only a I2S bypass module, It has a route, select one of the I2S source as input,(from HDMI or cpu data) delay the data for some time and then output it to the backend. In theory, this device is very sample, but I find I can't get a easy way to implement it in ALSA, I'm lost in ALSA. Any suggestion will be greatly appreciated.
Thanks.
On Tue, Dec 30, 2008 at 05:25:22PM +0800, Xuesong Yang wrote:
My problem is I don't know if it suitable for my device use Asoc. In my platform, there is only a I2S bypass module, It has a route, select one of the I2S source as input,(from HDMI or cpu data) delay the data for some time and then output it to the backend. In theory, this device is very sample, but I find I can't get a easy way to implement it in ALSA, I'm lost in ALSA. Any suggestion will be greatly appreciated.
ASoC sounds like a good fit here: it'd allow you to reuse the I2S and DMA drivers for the CPU and what you're doing is very similar to what a codec with analogue bypass can do so it's not really even unusual from an ASoC point of view. The only difference is that all your signals are digital but nothing outside the bypass module will be able to tell.
I'd suggest writing a codec driver for your bypass module - it fits into the system in the same place and from what you say it sounds like it could be viewed as a codec that happens to deal in digital formats only.
Hi Mark: Thanks for you suggestion. I'll have a look at the codec part of code.
-----Original Message----- From: Mark Brown [mailto:broonie@sirena.org.uk] Sent: Tuesday, December 30, 2008 9:26 PM To: Xuesong Yang Cc: alsa-devel@alsa-project.org Subject: Re: [alsa-devel] Is Asoc suitable for my device?
On Tue, Dec 30, 2008 at 05:25:22PM +0800, Xuesong Yang wrote:
My problem is I don't know if it suitable for my device use
Asoc.
In my platform, there is only a I2S bypass module, It has a
route,
select one of the I2S source as input,(from HDMI or cpu data) delay
the
data for some time and then output it to the backend. In theory, this device is very sample, but I find I can't get a
easy
way to implement it in ALSA, I'm lost in ALSA. Any suggestion will be greatly appreciated.
ASoC sounds like a good fit here: it'd allow you to reuse the I2S and DMA drivers for the CPU and what you're doing is very similar to what a codec with analogue bypass can do so it's not really even unusual from an ASoC point of view. The only difference is that all your signals are digital but nothing outside the bypass module will be able to tell.
I'd suggest writing a codec driver for your bypass module - it fits into the system in the same place and from what you say it sounds like it could be viewed as a codec that happens to deal in digital formats only.
participants (2)
-
Mark Brown -
Xuesong Yang