Re: [Bluez-devel] A2DP a2play and a2recv

[Brad Midgley <bmidgley@xmission.com>]

guys

first off, make sure you configure with --enable-fixed so you get the
fixed-point sbc library.

>          Thanks for reply. can a2play run on OSS too?

not directly.

if you know what you're doing, you could use dynamic loading tricks to
make writes to /dev/dsp go to custom code based on a2play.

it would be easier to modify the audio apps themselves. you may be able
to do that on your embedded platform.

>          I ported BlueZ on an embeded ARM7 running at 80 MHz.
>     I also try a2recv on embeded board with sound chip using OSS
>     driver. Printout looks ok, but can't hear anything:

it could be the cpu is too busy or the oss writes aren't right. I'm not
sure 80Mhz is fast enough.

There are a couple more sbc optimizations in the list of things to do.

- rework encoder to avoid moving values around (follow model from decoder)
- use a log2 table for byte integer scale factors calculation (sum log2
results for high and low bytes)
- fill bitpool by 16 bits instead of one at a time in bits
allocation/bitpool generation

Brad

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