From a7f86f2fd22b0d11a7b224f445678372c6061d64 Mon Sep 17 00:00:00 2001 From: "Ryan C. Gordon" Date: Sun, 22 Jan 2017 20:18:59 -0500 Subject: [PATCH] audio: don't cast to double in SDL_ConvertStereoToMono(). It's expensive and (hopefully) unnecessary. If this becomes an overflow problem, we could multiply both values by 0.5f before adding them, but let's see if we can get by without the extra multiplication first. --- src/audio/SDL_audiocvt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/audio/SDL_audiocvt.c b/src/audio/SDL_audiocvt.c index a922fd3e1..1c3d56a66 100644 --- a/src/audio/SDL_audiocvt.c +++ b/src/audio/SDL_audiocvt.c @@ -41,7 +41,7 @@ SDL_ConvertStereoToMono(SDL_AudioCVT * cvt, SDL_AudioFormat format) SDL_assert(format == AUDIO_F32SYS); for (i = cvt->len_cvt / 8; i; --i, src += 2) { - *(dst++) = (float) ((((double) src[0]) + ((double) src[1])) * 0.5); + *(dst++) = (src[0] + src[1]) * 0.5f; } cvt->len_cvt /= 2;