Hi Marcel , Andy ..
Thanks for bare with me so far ...
Based on your input and Mailing list info, I have choosen
alternate setting 1 in interface 1. I am using CSR chipset Bluetooth Dongle. My
voice setting value is 0x140. (mu-law). If i am submitting URBS to read, my
system is hanging.. I am using 2.6.12 kernel. if i am setting default voice
setting value 0x60... It is not hanging ... I dont know what would be the
probelm... Any one tips to track down this problem ...
Thanks
-Ivy
--- Ivy <[EMAIL PROTECTED]> wrote:
>
>
>
> --- Andreas Beck <[EMAIL PROTECTED]> wrote:
> > Ivy <[EMAIL PROTECTED]> wrote:
> > > > > xxxxxxxxxx1xxxxx Input Sample Size: 16 bit (Can i use 8 bit ?)
> > > > IMHO you should, if you want alaw/ulaw.
> > > You meant to use 16 Bit or 8 bit ?..
> >
> > 8 bit.
> >
> > > > > xxxxxxxxxxx010xx # of bits padding at MSB: 2 (if i use 16 Bit,
> > > > > 2bit's of MSB is needed for padding, coz only 14bits are enough
> > > > > for u-law)
> > > > AFAIK 8 bits are enough - could you explain?
> > > U-LAW takes 14bits of linear PCM data as input and generates 8 bit
> > > compressed data. Am i correct ?
> >
> > Yes. That is correct.
> >
> > > Thatswhy i assume that it needs 16 bits for INPUT Sample size and
> > > 2 bit offset in MSB position.
> >
> > No - I suppose this is a misunderstanding about "input".
> >
> > The SCM link via bluetooth uses its own encoding anyway (see the
> > comment about on air coding at the end of the list).
> >
>
> SCO LInk via bluetooh uses CVSD encoding...
>
> > INPUT means what you feed in/get out at the driver side.
> >
> > That is, if you choose alaw, you already feed alaw data.
> >
> > Otherwise you could just use linear anyway. There would be no use in
> > converting to alaw first and then again to the air coding format.
> >
> > Basically you will want to use alaw/ulaw, if you want to feed the
> > received data directly into a device that wants this data format anyway,
> > saving unnecessary conversions.
> >
>
> xxxxxx01xxxxxxxx Input Coding: u-law
> xxxxxxxx01xxxxxx Input Data Format: 2"s complement
> xxxxxxxxxx0xxxxx Input Sample Size: 8 bit
> xxxxxxxxxxx000xx # of bits padding at MSB: 0
> xxxxxxxxxxxxxx00 Air Coding Format: CVSD
>
> 0101000000 = 0x140 is the correct value ?. isnt it ?
> hciconfig hci0 voice 0x140. Is it necessary to change my USB alternate
> setting for the above changes ?. Right now it is placed in alternate setting
> 2. (Endpoint value 17). Thanks for bare with me
>
> Thanks
> -IVY
>
>
>
> >
> > CU, ANdy
> >
> >
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