[Bluez-devel] Float point SBC codec

[Bluez-devel] Float point SBC codec

[Chulwoong Jeon]

I have been looking for the float point version sbc codec 'btsco' and
trying to cvs under bluetooth-alsa web page but couldn't download it.

Would you let me know where I can find the float point sbc codec source code?

Chulwoong

> Chulwoong
>
> I'm responsible for any breakage in the decoder. I took the working
> floating point and converted it to fixed point and also reworked the
> algorithm.
>
> If you want to compare the last floating point version to see if it's
> less noisy, check out the cvs project "btsco" from bluetooth-alsa and
> ./configure and build it. You'll get the app sbcdec that can decode a
> stream and play it.
>
> I'll check on the change you recommended.
>
> The mailing list bluez-devel is a better place to ask than in private
> email since there are likely to be others on the list who have tried the
> decoder.
>
> Brad
>
> > I have several questions about your SBC codec. Currently, I am
> > evaluating your SBC codec and able to decode SBC streams.
> >
> > In order to evaluate your SBC codec, I downloaded a test package from
> > https://www.bluetooth.org/foundry/adopters/document/AV_101_sbc_bitstreams_test/en/1/AV_101_sbc_bitstreams_test.zip
> >
> > . I compared your decoder outputs with the reference decoder outputs
> > in the link, but the outputs from your decoder are nosier. I wonder
> > whether if my build of your codec is wrong or not. When I downloaded
> > the original project from http://sourceforge.net/projects/sbc/ , I
> > couldn't make your decoder work so that I made a small change. Please,
> > see below.
> >
> > In ' sbc_math_.h '
> >
> > Original:
> > #define SCALE4_STAGED2_BITS 23
> > #define SCALE8_STAGED2_BITS 23
> >
> > Modification:
> > #define SCALE4_STAGED2_BITS 30
> > #define SCALE8_STAGED2_BITS 30
> >
> > I wonder if you are able to give me any your decoder outputs using the
> > reference files in the link above.
> >
> > I am looking forward to have any answers from you.
> >
> > Best regards,
> >
> > Chulwoong
>

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