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Simplify the NXDN audio decoding.

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This commit is contained in:
Jonathan Naylor 2018-03-07 20:24:32 +00:00
parent 06ccaf6032
commit aac677d152
1 changed files with 5 additions and 7 deletions
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12
NXDNAudio.cpp
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@ -502,20 +502,18 @@ void CNXDNAudio::decode(const unsigned char* in, unsigned char* out, unsigned in
c |= MASK;
}
unsigned int data = CGolay24128::decode24128(a);
a >>= 12;
// The PRNG
unsigned int p = PRNG_TABLE[data] >> 1;
b ^= p;
unsigned int datb = CGolay24128::decode23127(b);
b ^= (PRNG_TABLE[a] >> 1);
b >>= 11;
MASK = 0x000800U;
for (unsigned int i = 0U; i < 12U; i++, MASK >>= 1) {
unsigned int aPos = i + offset + 0U;
unsigned int bPos = i + offset + 12U;
WRITE_BIT(out, aPos, data & MASK);
WRITE_BIT(out, bPos, datb & MASK);
WRITE_BIT(out, aPos, a & MASK);
WRITE_BIT(out, bPos, b & MASK);
}
MASK = 0x1000000U;