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IT import: fix stereo sample downmix

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tildearrow 2024-06-24 16:43:51 -05:00
parent fbe95a1c08
commit 76417e6769
1 changed files with 19 additions and 6 deletions
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25
src/engine/fileOps/it.cpp
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@ -400,19 +400,27 @@ bool DivEngine::loadIT(unsigned char* file, size_t len) {
if (flags&4) { // downmix stereo if (flags&4) { // downmix stereo
for (unsigned int i=0; i<s->samples; i++) { for (unsigned int i=0; i<s->samples; i++) {
short l; short l;
short r;
if (convert&2) { if (convert&2) {
l=reader.readS_BE(); l=reader.readS_BE();
r=reader.readS_BE();
} else { } else {
l=reader.readS(); l=reader.readS();
r=reader.readS();
} }
if (!(convert&1)) { if (!(convert&1)) {
l^=0x8000; l^=0x8000;
}
s->data16[i]=l;
}
for (unsigned int i=0; i<s->samples; i++) {
short r;
if (convert&2) {
r=reader.readS_BE();
} else {
r=reader.readS();
}
if (!(convert&1)) {
r^=0x8000; r^=0x8000;
} }
s->data16[i]=(l+r)>>1; s->data16[i]=(s->data16[i]+r)>>1;
} }
} else { } else {
for (unsigned int i=0; i<s->samples; i++) { for (unsigned int i=0; i<s->samples; i++) {
@ -427,12 +435,17 @@ bool DivEngine::loadIT(unsigned char* file, size_t len) {
if (flags&4) { // downmix stereo if (flags&4) { // downmix stereo
for (unsigned int i=0; i<s->samples; i++) { for (unsigned int i=0; i<s->samples; i++) {
signed char l=reader.readC(); signed char l=reader.readC();
signed char r=reader.readC();
if (!(convert&1)) { if (!(convert&1)) {
l^=0x80; l^=0x80;
}
s->data8[i]=l;
}
for (unsigned int i=0; i<s->samples; i++) {
signed char r=reader.readC();
if (!(convert&1)) {
r^=0x80; r^=0x80;
} }
s->data8[i]=(l+r)>>1; s->data8[i]=(s->data8[i]+r)>>1;
} }
} else { } else {
for (unsigned int i=0; i<s->samples; i++) { for (unsigned int i=0; i<s->samples; i++) {