pcm/Dsd2Pcm: move code to CalcOutputSample()
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@ -161,6 +161,18 @@ Dsd2Pcm::Reset() noexcept
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*/
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}
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inline float
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Dsd2Pcm::CalcOutputSample(unsigned ffp) const noexcept
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{
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double acc = 0;
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for (unsigned i = 0; i < CTABLES; ++i) {
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unsigned bite1 = fifo[(ffp -i) & FIFOMASK] & 0xFF;
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unsigned bite2 = fifo[(ffp-(CTABLES*2-1)+i) & FIFOMASK] & 0xFF;
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acc += ctables[i][bite1] + ctables[i][bite2];
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}
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return acc;
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}
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void
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Dsd2Pcm::Translate(size_t samples,
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const unsigned char *src, ptrdiff_t src_stride,
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@ -174,13 +186,8 @@ Dsd2Pcm::Translate(size_t samples,
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fifo[ffp] = bite1; src += src_stride;
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unsigned char *p = fifo + ((ffp-CTABLES) & FIFOMASK);
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*p = bit_reverse(*p);
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double acc = 0;
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for (unsigned i = 0; i < CTABLES; ++i) {
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bite1 = fifo[(ffp -i) & FIFOMASK] & 0xFF;
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unsigned bite2 = fifo[(ffp-(CTABLES*2-1)+i) & FIFOMASK] & 0xFF;
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acc += ctables[i][bite1] + ctables[i][bite2];
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}
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*dst = (float)acc; dst += dst_stride;
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*dst = CalcOutputSample(ffp);
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dst += dst_stride;
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ffp = (ffp + 1) & FIFOMASK;
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}
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fifopos = ffp;
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@ -73,6 +73,9 @@ public:
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const unsigned char *src, ptrdiff_t src_stride,
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bool lsbitfirst,
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float *dst, ptrdiff_t dst_stride) noexcept;
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private:
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float CalcOutputSample(unsigned ffp) const noexcept;
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};
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#endif /* include guard DSD2PCM_H_INCLUDED */
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