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small flt_rc.cpp update

This commit is contained in:
dinkc64 2015-02-09 19:18:22 +00:00
parent ef96e30179
commit eaebf94886
1 changed files with 13 additions and 4 deletions
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17
src/burn/snd/flt_rc.cpp
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@ -40,13 +40,18 @@ void filter_rc_update(INT32 num, INT16 *src, INT16 *pSoundBuf, INT32 length)
struct flt_rc_info *ptr;
ptr = &flt_rc_table[num];
INT32 memory = ptr->state.memory;
INT16 value;
switch (ptr->state.type) {
case FLT_RC_LOWPASS: {
while (length--) {
memory += (((INT32)((*src++ * ptr->src_gain)) - memory) * ptr->state.k) / 0x10000;
if (ptr->state.k == 0x10000) {
memory = (INT32)(*src++ * ptr->src_gain); // filter disabled
} else {
memory += (((INT32)((*src++ * ptr->src_gain)) - memory) * ptr->state.k) / 0x10000; // enabled
}
INT32 nLeftSample = 0, nRightSample = 0;
@ -77,7 +82,11 @@ void filter_rc_update(INT32 num, INT16 *src, INT16 *pSoundBuf, INT32 length)
case FLT_RC_HIGHPASS:
case FLT_RC_AC: {
while (length--) {
INT16 value = (INT32)(*src * ptr->src_gain) - memory;
if (ptr->state.k == 0x0) {
value = (INT32)(*src * ptr->src_gain); // filter disabled
} else {
value = (INT32)(*src * ptr->src_gain) - memory; // enabled
}
INT32 nLeftSample = 0, nRightSample = 0;