Re: [Bluez-devel] PATCH1/2: bluez-utils -fix-a2dp-buffer-constraints

[Fabien Chevalier <fabchevalier@free.fr>]

Hi Kai, please find below some comments
> 
> On 18 Oct 2007,  Jim Carter wrote:
>> I remember a month or two back, someone said that the A2DP 
>> profile was weak on flow control, requiring the source (ALSA) 
>> to send data at an even rate.  
>> If the headset's buffer is full can it cork the stream?  Or 
>> will the additional data just overwrite data already at the headset?
> 
> ok, I'm very new to A2DP, but my understanding is that timing 
> is done similarly as in RTP-over-IP: the receiver adapts to
> the clock of the sender. This means the sender just needs to 
> send at a steady pace (not required, but makes life easier for
> the receiver). And as with RTP, I assume implementations vary
> a lot in quality, so improving the timing (reducing jitter 
> and drift against nominal rate) will improve interoperability
> between different devices.

I agree with you :-)
Except for the timing part, i'm not really sure the receiver is that 
clever. I guess at least some of them will expect to receive data with
at their local clock speed...

> 
> Any ++agreed or --aggreed statements? :)
> 
>> With bluez-utils-3.19 (3.20 is latest) I'm having consistently 
>> good results sending to the Bluetooth ALSA device, with 
>> neither silent gaps nor lost chunks.  But I'm seeing 
>> corruption when going through PulseAudio, which is attributed 
>> to an unknown formatting or parameter issue and is being dealt 
>> with on their mailing list.
> 
> Have you tested with my patches (now in CVS)? Vanilla 3.19/3.20
> didn't work at all with Pulseaudio, but with my patches the
> playback is now flawless.

I didn't had time to test them, sorry :-(

Fabien

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