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pcm/Dsd2Pcm: move code to CalcOutputSample()

This commit is contained in:
Max Kellermann 2020-01-14 22:25:54 +01:00
parent e7483bc5bc
commit 6bfbc5d320
2 changed files with 17 additions and 7 deletions
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21
src/pcm/Dsd2Pcm.cxx
View File

@ -161,6 +161,18 @@ Dsd2Pcm::Reset() noexcept
*/
}
inline float
Dsd2Pcm::CalcOutputSample(unsigned ffp) const noexcept
{
double acc = 0;
for (unsigned i = 0; i < CTABLES; ++i) {
unsigned bite1 = fifo[(ffp -i) & FIFOMASK] & 0xFF;
unsigned bite2 = fifo[(ffp-(CTABLES*2-1)+i) & FIFOMASK] & 0xFF;
acc += ctables[i][bite1] + ctables[i][bite2];
}
return acc;
}
void
Dsd2Pcm::Translate(size_t samples,
const unsigned char *src, ptrdiff_t src_stride,
@ -174,13 +186,8 @@ Dsd2Pcm::Translate(size_t samples,
fifo[ffp] = bite1; src += src_stride;
unsigned char *p = fifo + ((ffp-CTABLES) & FIFOMASK);
*p = bit_reverse(*p);
double acc = 0;
for (unsigned i = 0; i < CTABLES; ++i) {
bite1 = fifo[(ffp -i) & FIFOMASK] & 0xFF;
unsigned bite2 = fifo[(ffp-(CTABLES*2-1)+i) & FIFOMASK] & 0xFF;
acc += ctables[i][bite1] + ctables[i][bite2];
}
*dst = (float)acc; dst += dst_stride;
*dst = CalcOutputSample(ffp);
dst += dst_stride;
ffp = (ffp + 1) & FIFOMASK;
}
fifopos = ffp;

3
src/pcm/Dsd2Pcm.hxx
View File

@ -73,6 +73,9 @@ public:
const unsigned char *src, ptrdiff_t src_stride,
bool lsbitfirst,
float *dst, ptrdiff_t dst_stride) noexcept;
private:
float CalcOutputSample(unsigned ffp) const noexcept;
};
#endif /* include guard DSD2PCM_H_INCLUDED */