Commit 659e1f0a3f6a29aea2a220203643f6b44eaf65e9
2021-07-29T17:49:52
audiocvt: The to-5.1 converters now soften FL and FR channels more. This is experimental and might be tweaked further. Reference #4104. Also reference: https://github.com/Keriew/augustus/issues/194#issuecomment-847655049
diff --git a/src/audio/SDL_audiocvt.c b/src/audio/SDL_audiocvt.c
index 34f505f..19a0835 100644
--- a/src/audio/SDL_audiocvt.c
+++ b/src/audio/SDL_audiocvt.c
@@ -397,8 +397,8 @@ SDL_ConvertStereoTo51(SDL_AudioCVT * cvt, SDL_AudioFormat format)
lf = src[0];
rf = src[1];
ce = (lf + rf) * 0.5f;
- dst[0] = 0.5f * (lf + (lf - ce)); /* FL */
- dst[1] = 0.5f * (rf + (rf - ce)); /* FR */
+ dst[0] = 0.571f * (lf + (lf - 0.5f * ce)); /* FL */
+ dst[1] = 0.571f * (rf + (rf - 0.5f * ce)); /* FR */
dst[2] = ce; /* FC */
dst[3] = 0; /* LFE (only meant for special LFE effects) */
dst[4] = lf; /* BL */
@@ -433,8 +433,8 @@ SDL_ConvertQuadTo51(SDL_AudioCVT * cvt, SDL_AudioFormat format)
lb = src[2];
rb = src[3];
ce = (lf + rf) * 0.5f;
- dst[0] = 0.5f * (lf + (lf - ce)); /* FL */
- dst[1] = 0.5f * (rf + (rf - ce)); /* FR */
+ dst[0] = 0.571f * (lf + (lf - 0.5f * ce)); /* FL */
+ dst[1] = 0.571f * (rf + (rf - 0.5f * ce)); /* FR */
dst[2] = ce; /* FC */
dst[3] = 0; /* LFE (only meant for special LFE effects) */
dst[4] = lb; /* BL */