Hello,
Thanks a lot for your help. If I'll find a solution for the playing speed
problem I'll post it (it won't be soon since today I'm going to a summer
vacation).
stan wrote:
> Hi Vladmir,
>
> On Mon, 16 Jul 2007 15:19:53 +0400
> Vladimir <kv11111@xxxxxxx> wrote:
>
>> stan wrote:
>> >> > Beyond that you could change the dmix6 to use only 4 channels, 0,
>> >> > 1, 2, 3.
>> >> I'll try this. Can I also just skip dmix6 and route the sound
>> >> directly to hardware ?
>> >>
>> > I'm not sure, but I don't think so. I think the channels are being
>> > defined by the dmix6 plugin, and so can't be used unless it is
>> > there. I'm not familiar enough with the plugin system to know if
>> > there are default channels defined, the 0-5 of the above ch51dup.
>> > Just drop it and leave the channels slave there and it might be
>> > enough to try # upmixing:
>> > pcm.ch20dup {
>> > type route
>> > slave.channels 4
>> > ttable.0.2 1
>> > ttable.1.3 1
>> > }
>> When I'm changing channels count to 4 for both ch20dup and dmix6 it
>> works well.
>
> Good to hear.
>
>>
>> > This will be true if the channels slave is defining the channel
>> > numbers. It might be, and if this works it would definitely be more
>> > robust and less cpu load than the first version. It should give you
>> > the identical output that you would get on the front channels.
>> I've tried it. It works but still requires defining the channel
>> number. It also requires different ttable:
>>
>> pcm.ch20dup {
>> type route
>> slave.pcm "hw:0"
>> slave.channels 6
>> ttable.0.4 1
>> ttable.1.5 1
>> }
>>
>> I've found one more strange problem: when the sound is played using
>> dmix everything is good, but when playing it directly it plays
>> slightly faster then it should - I've checked it with mplayer.
>
> You've reached the limit of my knowledge. I believe that dmix adjusts
> the stream so that the hardware gets frames at the rate it wants. And I
> vaguely recall that the native speed of the rev5.1 is 48000. If you
> are playing cd quality of 44,100, this might account for the increase
> in speed of play. All conjecture though, I don't know. You could test
> this by using audacity to resample to 48000 and try playing the
> resulting file. If it sounds correct with the higher frame rate, then
> this could be the explanation.
>
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--
Best Regards,
Vladimir
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