* SOC that needs L/R data in separate buffers
@ 2012-11-28 4:13 jonsmirl
2012-11-28 10:13 ` Liam Girdwood
0 siblings, 1 reply; 2+ messages in thread
From: jonsmirl @ 2012-11-28 4:13 UTC (permalink / raw)
To: alsa-devel mailing list
Is there a format in ALSA for hardware that wants the L/R stereo data
in two different buffers and not inter-leaved? Hardware has two DMA
channels into separate FIFOs for L/R.
If not I guess I have to unpack it inside the device driver. Doing
that will mess up mixing since ALSA won't know where the real DMA
buffer is.
FIFOs are only four samples deeps so that's probably too many
interrupts/sec to do programmed IO when FIFO is half full.
--
Jon Smirl
jonsmirl@gmail.com
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: SOC that needs L/R data in separate buffers
2012-11-28 4:13 SOC that needs L/R data in separate buffers jonsmirl
@ 2012-11-28 10:13 ` Liam Girdwood
0 siblings, 0 replies; 2+ messages in thread
From: Liam Girdwood @ 2012-11-28 10:13 UTC (permalink / raw)
To: jonsmirl@gmail.com; +Cc: alsa-devel mailing list, Mark Brown
On 28/11/12 04:13, jonsmirl@gmail.com wrote:
> Is there a format in ALSA for hardware that wants the L/R stereo data
> in two different buffers and not inter-leaved? Hardware has two DMA
> channels into separate FIFOs for L/R.
>
asound.h lists all the supported data formats and we have
SNDRV_PCM_ACCESS_RW_NONINTERLEAVED for non interleaved hardware.
Regards
Liam
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2012-11-28 4:13 SOC that needs L/R data in separate buffers jonsmirl
2012-11-28 10:13 ` Liam Girdwood
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