The-Homebrew-Cloud/Lime3DS
2
0
Fork 0
mirror of https://github.com/Lime3DS/Lime3DS.git synced 2024-11-27 12:04:16 +01:00
Code Issues Packages Projects Releases Wiki Activity

Use cubic mapping for volume control (#6020)

Browse Source 
* Use cubic mapping for volume control

* Update comment for hardware volume slider
This commit is contained in:
scribblemaniac 2022-05-20 11:17:37 -06:00 committed by GitHub
parent 46c6e5c4c0
commit a6e7a81de9
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/audio_core/dsp_interface.cpp
View File

@ -84,11 +84,11 @@ void DspInterface::OutputCallback(s16* buffer, std::size_t num_frames) {
std::memcpy(buffer + 2 * i, &last_frame[0], 2 * sizeof(s16)); std::memcpy(buffer + 2 * i, &last_frame[0], 2 * sizeof(s16));
} }
// Implementation of the hardware volume slider with a dynamic range of 60 dB // Implementation of the hardware volume slider
// A cubic curve is used to approximate a linear change in human-perceived loudness
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 = const float volume_scale_factor = linear_volume * linear_volume * linear_volume;
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);