Message-ID: <42B86FD5.8020204@xmission.com>
From: Brad Midgley <bmidgley@xmission.com>
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To: bluez-devel@lists.sourceforge.net
Subject: Re: [Bluez-devel] Advanced Audio Distribution Profile (A2DP)
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Date: Tue, 21 Jun 2005 13:51:49 -0600

Marcel

>>i was hoping to get the timing problem hammered by using setitimer. 
>>unfortunately, there still seems to be some dependency on the cpu speed 
>>which is surprising to me. there's a place in the code where the time 
>>period reported by libsbc is multiplied by 87/100. that 87 has to be 
>>tweaked for different cpus :(
> 
> this is because the encoding itself takes some time. For that we need to
> encode up to 6 SBC frames in advance.

the way a2play is now, we do preencode. right now it's set so the 
encoder will get ahead by 3 packets (typically 6 frames each?). sigalarm 
fires off regularly to initiate the transmission of one packet.

as far as integer stuff, should we be doing something like a short float

struct sfloat {
  int16 mantissa;
  uint8 exponent;
}

or a fixed point 32-bit value? any idea what part of the 32 bits would 
be best to have in front and behind the decimal?

i guess i should start by having libsbc keep track of ranges of the 
different floats so we can figure out where the precision needs to be.

brad


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