Thread (39 messages) 39 messages, 7 authors, 2017-03-27

[alsa-devel] [PATCH 0/3] ASoC: Enable a new IC master mode: bcm2835<=>IC<=>cs42xx8

From: Charles Keepax <hidden>
Date: 2017-02-28 09:59:29
Also in: alsa-devel

On Mon, Feb 27, 2017 at 12:51:08PM +0100, Matthias Reichl wrote:
On Mon, Feb 27, 2017 at 10:21:25PM +1100, Matt Flax wrote:
quoted

On 27/02/17 21:30, Matthias Reichl wrote:
quoted
I don't see that. Some people might want to be able to use multichannel
on RPi, but that's something very different than adding code that just
lies about driver capabilites.
I am going to invite you over for dinner to eat steamed vegetables :)
If I make the steamed vegetables in the microwave and they taste like
steamed vegetables, are they steamed vegetables ?
If you connect an amplifier with a volume control to your soundcard
does that mean that your soundcard now has a volume control? No, your
amp has.
quoted
I have a bcm2835 (Pi 2 and 3) SoC here. It is producing multichannel (8 out,
6 in) audio. In ALSA we call that DSP mode - right ?!
No. DSP modes are protocol/timing specifications as I2S, PDP, S/PDIF, ...
You can look these up in datasheets and if a chip implements such a
protocol you can be sure that it adheres to that standard - i.e. it
will sync the frames to the pulses on LRclk.
I agree with the thoughts in this thread really if the AP doesn't
actually support DSP A mode we shouldn't add DSP A mode.

Thanks,
Charles
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