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Minor performance improvement when extracting from slices #59

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Minor performance improvement when extracting from slices #59

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4 changes: 3 additions & 1 deletion qoa.h
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Original file line number Diff line number Diff line change
Expand Up @@ -626,12 +626,14 @@ unsigned int qoa_decode_frame(const unsigned char *bytes, unsigned int size, qoa
qoa_uint64_t slice = qoa_read_u64(bytes, &p);

int scalefactor = (slice >> 60) & 0xf;
slice <<= 4;

int slice_start = sample_index * channels + c;
int slice_end = qoa_clamp(sample_index + QOA_SLICE_LEN, 0, samples) * channels + c;

for (int si = slice_start; si < slice_end; si += channels) {
int predicted = qoa_lms_predict(&qoa->lms[c]);
int quantized = (slice >> 57) & 0x7;
int quantized = (slice >> 61) & 0x7;
int dequantized = qoa_dequant_tab[scalefactor][quantized];
int reconstructed = qoa_clamp_s16(predicted + dequantized);

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