[Sound-open-firmware] [PATCH v2 1/2] MUX component added

[Liam Girdwood]

On Tue, 2017-09-05 at 12:58 +0100, Ranjani Sridharan wrote:
> This patch adds a 1:N or N:1 MUX/DEMUX component. Only one source
> and one sink buffer can be active at run-time. The MUX component is
> configured using the COMP_CMD_MUX_SWITCH command passed along with
> the chosen source and sink buffer configuration. It performs no
> processing on the input samples, but simply copies the input frames
> from the source to the sink buffer.
> 
> Signed-off-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
> ---
>  src/audio/mux.c                    | 293 +++++++++++++++++++++++++++++++++++--
>  src/include/reef/audio/Makefile.am |   3 +-
>  src/include/reef/audio/component.h |   1 -
>  src/include/reef/audio/mux.h       |  50 +++++++
>  src/include/uapi/ipc.h             |   1 -
>  5 files changed, 335 insertions(+), 13 deletions(-)
>  create mode 100644 src/include/reef/audio/mux.h

Sorry, just had a thought that would improve the MUX a lot :)

Currently we have  (C is comp, B is buffer) :-

C0 -> B0 -> MUX -> B1 -> C1

but, with MUX we really want to be clever and save a buffer and a copy,
so we should really have

C0 -> (MUX) -> B1 -> C1

Meaning the mux does not actually do any copying, but just updates the
source and sink buffer of C0 and C1 to use B1.

Liam

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