[pulseaudio-discuss] Nvidia hdmi passthrough patch

[David Henningsson]

Please answer in the list; if everyone can benefit from the answer.

On 01/19/2012 12:02 PM, Peter Humphreys wrote:
> Ah ok the description of the thread made me think it was talking about
> passthrough specifically for the NVIDIA HDMI ports. ie having
> audio/video sent through as is and the receiver does the decoding of the
> audio/video stream.
>
> Quote "Hey,
>
> Here's a patch that I created for git that adds passthrough support for
> the Nvidia hdmi port.  Pretty much just copy/paste from the iec958
> sections."
>
> So what is this patch for then exactly?

It seems obsolete. Passthrough detection is not hard coded through names 
such as "hdmi-passthrough-output" any more, AFAICT.

> Also is there any reason why my receiver is only getting 44Khz and not
> any higher sampling rates?

> If pulse audio already supports passthrough is it just a matter of the
> likes of VLC etc coding support for it?

Yes. Also I'm unsure how the detection of what formats the receiver 
supports is implemented yet, or if you have to set it manually through 
pavucontrol (which again did not make it into 11.10)?

>
> Regards,
> Peter
>
>
> On Thu, 2012-01-19 at 11:33 +0100, David Henningsson wrote:
>> On 01/16/2012 10:09 AM, Peter Humphreys wrote:
>>> Hi there,
>>>
>>> I just found this post:
>>>
>>> https://tango.0pointer.de/pipermail/pulseaudio-discuss/2011-March/009291.html
>>>
>>> Is this relevant to HDMI passthrough to receivers IE: so the NVIDIA
>>> isn't decoding the audio stream, allowing the receiver to get DTS-HD MA,
>>> True HD, FLAC etc encoded streams and do the decoding on the receiver??
>>>
>>> Because at the moment I only get PCM on my receiver from the NVIDIA,
>>> where as in Windows 7 I can use powerdvd which passes through the signal
>>> for the receiver to decode, in Ubuntu I have no options to do that.
>>
>> The a52 sink is not in Ubuntu for patent reasons [1], but that's only
>> about encoding.
>>
>> Passthrough is, unless Arun corrects me, about having already compressed
>> data being decoded in the receiver. Ubuntu 11.10's pulseaudio has
>> support for that, but the rest of the pieces aren't there - in
>> particular, no client application supports PulseAudio's passthrough API
>> yet.
>>
>
>



-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic