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Add volume scaling.

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This commit is contained in:
casey langen 2022-12-29 16:53:29 -08:00
parent a7751afb57
commit 4afc8af219
1 changed files with 19 additions and 1 deletions
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20
src/plugins/portaudioout/PortAudioOut.cpp
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@ -39,6 +39,8 @@
#include <musikcore/sdk/ISchema.h>
#include <musikcore/sdk/IDebug.h>
#include <cmath>
using namespace musik::core::sdk;
#ifdef WIN32
@ -237,9 +239,25 @@ OutputState PortAudioOut::Play(IBuffer *buffer, IBufferProvider *provider) {
}
if (this->paStream) {
auto const frameCount = buffer->Samples() / buffer->Channels();
auto audio = buffer->BufferPointer();
auto const samples = buffer->Samples();
auto const frameCount = samples / buffer->Channels();
if (volume != 1.0f) {
float gain = 0.0;
if (volume > 0) {
float dB = 20.0 * std::log(volume/1.0);
gain = std::pow(10.0, dB / 20.0);
}
for (size_t i = 0; i < samples; i++) {
(*audio) *= gain;
++audio;
}
}
PaError result = Pa_WriteStream(
this->paStream, buffer->BufferPointer(), frameCount);
if (result == paNoError) {
provider->OnBufferProcessed(buffer);
return OutputState::BufferWritten;