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dsp_interface: fix sound being played while volume is 0

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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.
This commit is contained in:
fearlessTobi 2019-01-26 14:53:58 +01:00
parent 8b047a49ae
commit 24f966481f
1 changed files with 2 additions and 1 deletions
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3
src/audio_core/dsp_interface.cpp
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@ -77,7 +77,8 @@ void DspInterface::OutputCallback(s16* buffer, std::size_t num_frames) {
// Implementation of the hardware volume slider with a dynamic range of 60 dB // Implementation of the hardware volume slider with a dynamic range of 60 dB
const float linear_volume = std::clamp(Settings::values.volume, 0.0f, 1.0f); const float linear_volume = std::clamp(Settings::values.volume, 0.0f, 1.0f);
if (linear_volume != 1.0) { if (linear_volume != 1.0) {
const float volume_scale_factor = std::exp(6.90775f * linear_volume) * 0.001f; const float volume_scale_factor =
linear_volume == 0 ? 0 : std::exp(6.90775f * linear_volume) * 0.001f;
for (std::size_t i = 0; i < num_frames; i++) { for (std::size_t i = 0; i < num_frames; i++) {
buffer[i * 2 + 0] = static_cast<s16>(buffer[i * 2 + 0] * volume_scale_factor); buffer[i * 2 + 0] = static_cast<s16>(buffer[i * 2 + 0] * volume_scale_factor);
buffer[i * 2 + 1] = static_cast<s16>(buffer[i * 2 + 1] * volume_scale_factor); buffer[i * 2 + 1] = static_cast<s16>(buffer[i * 2 + 1] * volume_scale_factor);