Help Adjusting HDA HDMI settings

[b***@gmail.com]

Hi All,
I need to change the of an ALSA driver on a proprietary arm linux box. Specifically the box in its standard configuration is hard coded to have 2 channel audio output only. The hardware on the box I’m assured by the manufacturer is capable of surround 5.1 output on it’s HDMI port. I therefore need to increase the ALSA driver’s capabilities to handle surround 5.1 output. I have the kernel source code for box.

Could someone point me in the direction of what would need changing/adding in order to achieve this please.

Thanks
Ben

[Clemens Ladisch]

Post by b***@gmail.com
The hardware on the box I’m assured by the manufacturer is capable of
surround 5.1 output on it’s HDMI port.

Where "surround 5.1" means Dolby Digital, i.e., compressed into two
channels (if the receiving device supports decoding it)? And "hardware"
means "write the driver yourself"? ;-)

Well, what hardware/driver is this?


Regards,
Clemens

[b***@gmail.com]

Hi Clemens,
Thanks for the reply.

The surround 5.1 is already decoded. So I am actually trying to send 6 channels of PCM sound, i.e.the 6 channels of surround 5.1, to the HDMI port and then on to the the display device (TV, monitor, projector etc.). The manufacture of the propriety box says it can do this. I have the source code of the manufactures 2 channel PCM driver and need pointers on how to alter it to send the six channels required.

Unfortunately I can’t tell you much more about the propriety box as I’m under an NDA preventing me from doing so.

Any help you could supply would be much appreciated, thanks.

Regards
Ben

From: Clemens Ladisch
Sent: Friday, October 10, 2014 2:06 PM
To: ***@gmail.com ; ALSA Mailing list
Subject: Re: [alsa-devel] Help Adjusting HDA HDMI settings

Post by b***@gmail.com
The hardware on the box I’m assured by the manufacturer is capable of
surround 5.1 output on it’s HDMI port.

Where "surround 5.1" means Dolby Digital, i.e., compressed into two
channels (if the receiving device supports decoding it)? And "hardware"
means "write the driver yourself"? ;-)

Well, what hardware/driver is this?


Regards,
Clemens