On Dec 9 2016 01:37, Arnaud Pouliquen wrote:
Aim of this patch is to add 'Playback Channel Map' control to export
audio capabilities in term of HDMI sink speakers allocation.
This patch follow discussion initiates here:
[RFC] ASOC: HDMI audio info frame speaker allocation
http://www.spinics.net/lists/alsa-devel/msg57363.html
The code is fully inspired from HDA driver.
On hw_param, HDMI sink speaker capabilities are exported via TLV ops
and a CEA allocation is choson, based on ELD information and the number of
channels requested by user.
Mains differences with HDA implementation are:
- Control is read only
- Channel swap is not supported. Consequence is that unused channel in
the mid of CEA audio infoframe channel mapping are considered as
active.
example for channel allocation 0x02: FL, FR, 0, FC)
This configuration is only available for a 4 channels stream.
- Channel allocation table has been reordered and HDMI 2.0 is not
supported.
Arnaud Pouliquen (2):
DRM: add help to get ELD speaker allocation
ASoC: hdmi-codec: add channel mapping control
include/drm/drm_edid.h | 13 ++
sound/soc/codecs/hdmi-codec.c | 346 +++++++++++++++++++++++++++++++++++++++++-
2 files changed, 358 insertions(+), 1 deletion(-)
Please pay enough attention to development cycle for Linux kernel.
We're mostly on the end of development for 4.9 cycle, and review process
for new feature might be delay for next cycle, till 4.9 release, two
weeks later.
Regards
Takashi Sakamoto
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