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frontend: Restore linear interpolation for audio output resampling 

Also, do it smarter this time. This seems to have gone missing with the
doublemelon merge.
This commit is contained in:
Nadia Holmquist Pedersen 2024-07-07 08:19:49 +02:00
parent 25b5ac91bd
commit 1302cbdd64
1 changed files with 11 additions and 3 deletions
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14
src/frontend/qt_sdl/EmuInstanceAudio.cpp
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@ -40,13 +40,21 @@ int EmuInstance::audioGetNumSamplesOut(int outlen)
void EmuInstance::audioResample(s16* inbuf, int inlen, s16* outbuf, int outlen, int volume)
{
float res_incr = inlen / (float)outlen;
float res_timer = 0;
float res_timer = -0.5;
int res_pos = 0;
for (int i = 0; i < outlen; i++)
{
outbuf[i*2 ] = (inbuf[res_pos*2 ] * volume) >> 8;
outbuf[i*2+1] = (inbuf[res_pos*2+1] * volume) >> 8;
s16 l1 = inbuf[res_pos * 2];
s16 l2 = inbuf[res_pos * 2 + 2];
s16 r1 = inbuf[res_pos * 2 + 1];
s16 r2 = inbuf[res_pos * 2 + 3];
float l = (float) l1 + ((l2 - l1) * res_timer);
float r = (float) r1 + ((r2 - r1) * res_timer);
outbuf[i*2 ] = (s16) (((s32) round(l) * volume) >> 8);
outbuf[i*2+1] = (s16) (((s32) round(r) * volume) >> 8);
res_timer += res_incr;
while (res_timer >= 1.0)