[pulseaudio-discuss] [PATCH] alsa-mixer: sb-omni-surround-5.1.conf: remove analog-surround-21, add Linux 4.3+ support

[Tom Yan]

Sorry, I meant surround21.

On 16 January 2016 at 17:21, Tom Yan <tom.ty89 at gmail.com> wrote:
> What do you mean by "noise in nth output starting from 1 instead,
> relatively hight frequency light clicking"? How were you testing
> exactly? speaker-test? if so what're the "-D"s you used? Can you paste
> full commands (and maybe even the text output).
>
> What you said doesn't seem to make sense. If surround51 works, then
> surround41 and surround20 should at most cause a signal/speaker
> mismatch. I don't see how it can produce some weird noise/click.
>
> On 16 January 2016 at 16:26, Nazar Mokrynskyi <nazar at mokrynskyi.com> wrote:
>> OK, I've spent another hour or so trying different combinations and it seems
>> to be a bug inside either ALSA or PulseAudio.
>> SB Omni Surround 5.1, as you can see from name, has 6 outputs:
>> front-left,front-right,rear-left,rear-right,front-center,lfe (lets ignore
>> other non-related inputs/outputs here)
>> I've done many experiments and defined which modes are working and which
>> doesn't.
>>
>> Modes that work fine:
>> - 5.1
>> - 5.0
>> - 4.0
>> - 2.0
>>
>> Modes that doesn't work fine:
>> - 2.1 (stereo only, noise in 3rd output starting from 1 instead, relatively
>> hight frequency light clicking)
>> - 4.1 (quadro only, noise in 5th output starting from 1 instead, relatively
>> hight frequency light clicking)
>>
>> It is clearly visible that any time I want to skip some output, for
>> instance:
>>     ttable.0.FL 1
>>     ttable.1.FR 1
>>     ttable.5.LFE 1
>> instead of
>>     ttable.0.FL 1
>>     ttable.1.FR 1
>>     ttable.2.LFE 1
>>
>> To direct LFE to proper output it doesn't work. This is the same reason why
>> 5.0 is working fine (no skipped outputs, all consequent) and 4.1 doesn't (we
>> need to skip 5th output starting from 1 and use 6th instead).
>>
>> When I try this:
>>     ttable.0.FL 1
>>     ttable.2.FR 1
>>     ttable.1.LFE 1
>> then as expected I can hear LFE in right front output.
>>
>> Any hints from anyone what is wrong here? There are literally NO DOCS about
>> how it works internally, so these experiments all I can provide at the
>> moment.
>> There were pulseaudio logs in this thread if anyone needs details.
>>
>> ALSA 1.1.0, PulseAudio 7.1, Ubuntu 16.04 x64
>>
>> Sincerely, Nazar Mokrynskyi
>> github.com/nazar-pc
>> Skype: nazar-pc
>> Diaspora: nazarpc at diaspora.mokrynskyi.com
>> Tox:
>> A9D95C9AA5F7A3ED75D83D0292E22ACE84BA40E912185939414475AF28FD2B2A5C8EF5261249
>>
>> On 28.11.15 09:56, Raymond Yau wrote:
>>
>>
>>>
>>> I've been looking at those lines. Do you think it should be done in
>>> USB-Audio, or should it be added into separate config file specific for this
>>> sound card?
>>
>> http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/conf/pcm/surround21.conf;hb=HEAD
>>
>> The route of surround21 is hardcoded to use surround51 , this mean your
>> ttable are used by those usb audio support 6 channels, those usb audio which
>> only support 8 channels need to define their own 21 route as both surround51
>> and surround71 of usb audio use route plugin
>>
>>
>>
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>>
>>
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