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Re: [mediaqueries4] Media queries for multichannel audio ?

From: Kenneth Rohde Christiansen <kenneth.r.christiansen@intel.com>
Date: Wed, 20 Mar 2013 16:09:02 +0100
Message-ID: <CAEC208t8oKH65=NK_7zJpaxX_zieQvB1vvB4XZtCV1SmWvoX0Q@mail.gmail.com>
To: Mark Watson <watsonm@netflix.com>
Cc: "florian@rivoal.net" <florian@rivoal.net>, "www-style@w3.org" <www-style@w3.org>
WebKit has devicePixelRatio so you can device the device size by using
that. Something to query that should probably be standardized, but
media queries are not exactly for querying exact values.

Kenneth

On Wed, Mar 20, 2013 at 4:03 PM, Mark Watson <watsonm@netflix.com> wrote:
> Florian, all,
>
> How do I progress this issue ? Do I need to file a bug ? (where?) Do I need to join the WG ?
>
> There are also two other issues I'm interested in with respect to TVs:
> - output frame rate (no point giving 60fps content to a 30fps display)
> - screen dimensions in physical pixels (no point giving HD content to an SD display)
>
> For the latter one, I am unsure about whether this can be derived from the existing width/height and resolution properties. Width and Height seem to be in CSS pixels which are explicitly defined with reference to "computer displays", so it is unlearn what is a CSS pixel on a TV.
>
> Best regards,
>
> Mark
>
> On Mar 19, 2013, at 10:10 AM, Henrik Andersson wrote:
>
>> Mark Watson skriver:
>>>
>>> On Mar 19, 2013, at 9:42 AM, Henrik Andersson wrote:
>>>
>>>> Mark Watson skriver:
>>>>> Hi everyone,
>>>>>
>>>>> Has there been any dissuasion of media queries for audio media ?
>>>>>
>>>>> Specifically, I am interested in discovering whether the attached audio device supports multi-channel audio (5.1, 7.1 etc.) so that I can choose an appropriate resource.
>>>>>
>>>>> I believe it would be sufficient to have a 'channel count' property which is just an integer count of the number of audio channels supported by the output device.
>>>>>
>>>>> Thanks!
>>>>>
>>>>> Mark Watson
>>>>>
>>>>>
>>>>
>>>> I'd like to add that it could be useful to know if there is a limit to
>>>> the number of mixer channels available. Some platforms use hardware
>>>> mixers that have a limited amount of channels.
>>>
>>> Actually, I am interested in the number of physical speakers - or more specifically the number of channels actually output from the device.
>>>
>>> I have a multichannel stream and a professionally downmixed stereo stream and if there are only two output channels I'd rather provide the stereo stream than have the device do its own downmixing.
>>>
>>> I distinguish between the number of physical speakers and the number of output channels because there are setups where the audio output is making proper use of the 6 output channels but has less than 6 speakers (for example soundbars, where there is audio processing which tries to simulate the effect of surround speakers using phase manipulations etc.). I consider those setups as having 6 output channels. But if the device is doing straight downmixing to stereo, I'd rather provide the professional stereo stream (which is also less bandwidth).
>>>
>>
>> To clarify, I am not saying that your case is the same as mine. I just
>> wanted to add a related thing that could be useful to detect. Some
>> devices simply have limits on the number of sounds they can play at the
>> same time.
>>
>>
>
>



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Received on Wednesday, 20 March 2013 15:09:53 GMT

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