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dsp_interface: Move volume control to audio thread 

We also clamp the linear volume value to [0.0, 1.0].
Do nothing if linear volume is 1.0.
This commit is contained in:
MerryMage 2018-09-08 22:21:49 +01:00
parent eed55a813e
commit 675ffc1024
1 changed files with 10 additions and 7 deletions
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17
src/audio_core/dsp_interface.cpp
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@ -42,13 +42,6 @@ void DspInterface::OutputFrame(StereoFrame16& frame) {
if (!sink)
return;
// Implementation of the hardware volume slider with a dynamic range of 60 dB
double volume_scale_factor = std::exp(6.90775 * Settings::values.volume) * 0.001;
for (std::size_t i = 0; i < frame.size(); i++) {
frame[i][0] = static_cast<s16>(frame[i][0] * volume_scale_factor);
frame[i][1] = static_cast<s16>(frame[i][1] * volume_scale_factor);
}
fifo.Push(frame.data(), frame.size());
}
@ -75,6 +68,16 @@ void DspInterface::OutputCallback(s16* buffer, std::size_t num_frames) {
for (std::size_t i = frames_written; i < num_frames; i++) {
std::memcpy(buffer + 2 * i, &last_frame[0], 2 * sizeof(s16));
}
// 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);
if (linear_volume != 1.0) {
const float volume_scale_factor = std::exp(6.90775f * linear_volume) * 0.001f;
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 + 1] = static_cast<s16>(buffer[i * 2 + 1] * volume_scale_factor);
}
}
}
} // namespace AudioCore