[Speex-dev] About "Convert 8->16 bits"

yaseminyilmaz yaseminyilmaz at aytor.com
Fri Dec 15 08:46:01 PST 2006


Hi everybody,


I have been using speex-1.2beta1 and my input data is 8-bit unsigned so I
know that I should convert from 8 to 16 bits. I've done the convertion as


for(int i=0; i<160; ++i)


            input_frame[i] = (short)( (data[2*i] << 8) | data[2*i+1]);



When my codec application didn't work right, I think that the reason is an
error at this convertion. For this aim, I looked at read_samples function in
speexenc project and I can't understand why the convertion is done in this







(in my application, channels is 1 and frame_size=160)


I can understand why shift left 8, but can't why we should do XOR operation
with 1000 0000 0000 0000. Should I do the convertion operation so and why?
Please can you clarify? Thanks a lot for your helps.




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