From 7185d90a5376fb1642abe9491aa412f9f6b49003 Mon Sep 17 00:00:00 2001
From: fearlessTobi <thm.frey@gmail.com>
Date: Sat, 26 Jan 2019 14:53:58 +0100
Subject: [PATCH] dsp_interface: fix sound being played while volume is 0

According to documentation, if the argument of std::exp is zero, one is returned.
However we want the return value to be also zero in this case so no audio is played.
---
 src/audio_core/stream.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/audio_core/stream.cpp b/src/audio_core/stream.cpp
index 874673c4e5..4ce2d374e6 100644
--- a/src/audio_core/stream.cpp
+++ b/src/audio_core/stream.cpp
@@ -68,7 +68,7 @@ static void VolumeAdjustSamples(std::vector<s16>& samples) {
     }
 
     // Implementation of a volume slider with a dynamic range of 60 dB
-    const float volume_scale_factor{std::exp(6.90775f * volume) * 0.001f};
+    const float volume_scale_factor = volume == 0 ? 0 : std::exp(6.90775f * volume) * 0.001f;
     for (auto& sample : samples) {
         sample = static_cast<s16>(sample * volume_scale_factor);
     }