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Minor doc

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This commit is contained in:
bnnm 2018-09-06 18:10:47 +02:00
parent 5e2283f51a
commit 800ebfc007
1 changed files with 3 additions and 3 deletions
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src/coding/ima_decoder.c
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@ -147,7 +147,7 @@ static void snds_ima_expand_nibble(VGMSTREAMCHANNEL * stream, off_t byte_offset,
*hist1 = clamp16(sample_decoded); *hist1 = clamp16(sample_decoded);
} }
/* Omikron: The Nomad Soul, algorithm by aluigi */ /* Omikron: The Nomad Soul, algorithm from the .exe */
static void otns_ima_expand_nibble(VGMSTREAMCHANNEL * stream, off_t byte_offset, int nibble_shift, int32_t * hist1, int32_t * step_index) { static void otns_ima_expand_nibble(VGMSTREAMCHANNEL * stream, off_t byte_offset, int nibble_shift, int32_t * hist1, int32_t * step_index) {
int sample_nibble, sample_decoded, step, delta; int sample_nibble, sample_decoded, step, delta;
@ -156,8 +156,8 @@ static void otns_ima_expand_nibble(VGMSTREAMCHANNEL * stream, off_t byte_offset,
step = ADPCMTable[*step_index]; step = ADPCMTable[*step_index];
delta = 0; delta = 0;
if(sample_nibble & 4) delta = step << 2; if(sample_nibble & 4) delta = step * 4;
if(sample_nibble & 2) delta += step << 1; if(sample_nibble & 2) delta += step * 2;
if(sample_nibble & 1) delta += step; if(sample_nibble & 1) delta += step;
delta >>= 2; delta >>= 2;
if (sample_nibble & 8) delta = -delta; if (sample_nibble & 8) delta = -delta;