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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
This commit is contained in:
Ryan C. Gordon 2021-07-29 17:49:52 -04:00
parent f20a85818c
commit 659e1f0a3f
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GPG Key ID: FA148B892AB48044
1 changed files with 4 additions and 4 deletions
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8
src/audio/SDL_audiocvt.c
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@ -397,8 +397,8 @@ SDL_ConvertStereoTo51(SDL_AudioCVT * cvt, SDL_AudioFormat format)
lf = src[0]; lf = src[0];
rf = src[1]; rf = src[1];
ce = (lf + rf) * 0.5f; ce = (lf + rf) * 0.5f;
dst[0] = 0.5f * (lf + (lf - ce)); /* FL */ dst[0] = 0.571f * (lf + (lf - 0.5f * ce)); /* FL */
dst[1] = 0.5f * (rf + (rf - ce)); /* FR */ dst[1] = 0.571f * (rf + (rf - 0.5f * ce)); /* FR */
dst[2] = ce; /* FC */ dst[2] = ce; /* FC */
dst[3] = 0; /* LFE (only meant for special LFE effects) */ dst[3] = 0; /* LFE (only meant for special LFE effects) */
dst[4] = lf; /* BL */ dst[4] = lf; /* BL */
@ -433,8 +433,8 @@ SDL_ConvertQuadTo51(SDL_AudioCVT * cvt, SDL_AudioFormat format)
lb = src[2]; lb = src[2];
rb = src[3]; rb = src[3];
ce = (lf + rf) * 0.5f; ce = (lf + rf) * 0.5f;
dst[0] = 0.5f * (lf + (lf - ce)); /* FL */ dst[0] = 0.571f * (lf + (lf - 0.5f * ce)); /* FL */
dst[1] = 0.5f * (rf + (rf - ce)); /* FR */ dst[1] = 0.571f * (rf + (rf - 0.5f * ce)); /* FR */
dst[2] = ce; /* FC */ dst[2] = ce; /* FC */
dst[3] = 0; /* LFE (only meant for special LFE effects) */ dst[3] = 0; /* LFE (only meant for special LFE effects) */
dst[4] = lb; /* BL */ dst[4] = lb; /* BL */