[Bluez-devel] sound quality is very slow when using helix player.

[Bluez-devel] sound quality is very slow when using helix player.

[Wang Baisheng]

Hi, All

	I've found sound quality is very low using helix player through bluez audio 
service.
	My kernel is 2.6.22 and bluez is 3.31.

	Any idea ?

	Thanks.

BRs, 
Baisheng

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Re: [Bluez-devel] sound quality is very slow when using helix player.

[Zhao, Halley]

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　　I have tried several versions of bluez-utils.
　　1. 3.19, which is included in Ubuntu 7.10 (Gutsy), it has good audio quality.
　　2. 3.26, which is included in Ubuntu Hardy distribution, audio quality has degraded a lot.
　　3. 3.31, also bad audio quality.
　　
　　
　　
　　>-----Original Message-----
　　>From: bluez-devel-bounces@lists.sourceforge.net
　　>[mailto:bluez-devel-bounces@lists.sourceforge.net] On Behalf Of Wang
　　>Baisheng
　　>Sent: 2008年5月17日 8:26
　　>To: bluez-devel@lists.sourceforge.net
　　>Subject: [Bluez-devel] sound quality is very slow when using helix player.
　　>
　　>
　　>Hi, All
　　>
　　>	I've found sound quality is very low using helix player through bluez audio
　　>service.
　　>	My kernel is 2.6.22 and bluez is 3.31.
　　>
　　>	Any idea ?
　　>
　　>	Thanks.
　　>
　　>BRs,
　　>Baisheng
　　>
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　　>Defy all challenges. Microsoft(R) Visual Studio 2008.
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　　>https://lists.sourceforge.net/lists/listinfo/bluez-devel


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Re: [Bluez-devel] sound quality is very slow when using helix player.

[Marcel Holtmann]

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Hi Halley,

>
> 　　I have tried several versions of bluez-utils.
> 　　1. 3.19, which is included in  
> Ubuntu 7.10 (Gutsy), it has good audio quality.
> 　　2. 3.26, which is included in  
> Ubuntu Hardy distribution, audio quality has degraded a lot.
> 　　3. 3.31, also bad audio quality.

we do dynamic re-configuration of the A2DP link based on the quality  
aspect given from the player. This means you can switch on the fly  
between MP3 and SBC and even between mono and stereo etc. I think you  
get the idea. However this is complex stuff and there might be a bug.  
Especially since nobody I know used Helix so far. As mentioned before  
in a private email, provide us with as much details and debug  
information and then we debug this one.

Regards

Marcel



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Re: [Bluez-devel] sound quality is very slow when using helix player.

[Luiz Augusto von Dentz]

>>From 3.19 to 3.31 there are a lot of changes, so we better focus on 2
things, sbc codec and plugin code. As helix happen to not have a
native plugin so I suppose you are using alsa plugin. What really
changed from 3.19 to 3.31 is that the configuration logic moved from
audio service to plugin, so the user application (helix player) is now
able to select the stream frequency and how many channels it has. This
could be a problem if helix is not selecting the same rate as the
stream and might cause audio degradation, it is also possible that
helix is resampling which not only may cause degradation but also
consumes more cpu.

ps: you can play with sbc parameters directly on ~/.asoundrc, so
perhaps you can find a configuration that do not degraded.

-- =

Luiz Augusto von Dentz
Engenheiro de Computa=E7=E3o

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