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g711_decode.h

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g711_decode.h

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* File: g711_decode.h

* G.711 u-law & A-law decoder

* 2020 (c) Oleg Burdaev

* mailto: dukesrg@gmail.com

#pragma once

#include"fixed_math.h"

#defineBIAS 0x84

#defineQUANT_MASK 0x0F

#defineSEG_MASK 0x70

#defineSEG_SHIFT 4

#defineSIGN_BIT 0x80

staticinline __attribute__((optimize("Ofast"),always_inline))

q15_talaw_to_q15(uint8_tx)

{

x ^=0x55;

q15_tt= (x&QUANT_MASK) <<4;

q15_ts= (x&SEG_MASK) >>SEG_SHIFT;

switch (s) {

case0:

t+=8;

break;

case1:

t+=0x108;

break;

default:

t+=0x108;

t <<=s-1;

}

return (x&SIGN_BIT) ?t :-t;

}

staticinline __attribute__((optimize("Ofast"),always_inline))

q31_talaw_to_q31(uint8_tx)

{

returnq15_to_q31(alaw_to_q15(x));

}

staticinline __attribute__((optimize("Ofast"),always_inline))

floatalaw_to_f32(uint8_tx)

{

returnq15_to_f32(alaw_to_q15(x));

}

staticinline __attribute__((optimize("Ofast"),always_inline))

q15_tulaw_to_q15(uint8_tx)

{

x= ~x;

q15_tt= (((x&QUANT_MASK) <<3)+BIAS) << ((x&SEG_MASK) >>SEG_SHIFT);

return (x&SIGN_BIT) ? (BIAS-t) : (t-BIAS);

}

staticinline __attribute__((optimize("Ofast"),always_inline))

q31_tulaw_to_q31(uint8_tx)

{

returnq15_to_q31(ulaw_to_q15(x));

}

staticinline __attribute__((optimize("Ofast"),always_inline))

floatulaw_to_f32(uint8_tx)

{

returnq15_to_f32(ulaw_to_q15(x));

}

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