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Implement audren Surround->Stereo downmixing

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This commit is contained in:
Billy Laws 2022-04-09 12:11:31 +01:00 committed by PixelyIon
parent ad0005f398
commit af90d4f977
2 changed files with 8 additions and 2 deletions
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2
app/src/main/cpp/skyline/audio/downmixer.h
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@ -30,7 +30,7 @@ namespace skyline::audio {
/**
* @brief Downmixes a buffer of 5.1 surround audio to stereo
*/
std::vector<StereoSample> DownMix(span<Surround51Sample> surroundSamples) {
inline std::vector<StereoSample> DownMix(span<Surround51Sample> surroundSamples) {
constexpr i16 FixedPointMultiplier{1000}; //!< Avoids using floating point maths
constexpr i16 Attenuation3Db{707}; //! 10^(-3/20)
constexpr i16 Attenuation6Db{501}; //! 10^(-6/20)

8
app/src/main/cpp/skyline/services/audio/IAudioRenderer/voice.cpp
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@ -2,6 +2,7 @@
// Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
#include <kernel/types/KProcess.h>
#include <audio/downmixer.h>
#include "voice.h"
namespace skyline::service::audio::IAudioRenderer {
@ -36,7 +37,7 @@ namespace skyline::service::audio::IAudioRenderer {
format = input.format;
sampleRate = input.sampleRate;
if (input.channelCount > (input.format == skyline::audio::AudioFormat::ADPCM ? 1 : 2))
if (input.channelCount > (input.format == skyline::audio::AudioFormat::ADPCM ? 1 : 6))
throw exception("Unsupported voice channel count: {}", input.channelCount);
channelCount = static_cast<u8>(input.channelCount);
@ -89,6 +90,11 @@ namespace skyline::service::audio::IAudioRenderer {
samples[--targetIndex] = sample;
}
}
if (channelCount == constant::SurroundChannelCount) {
span(samples).copy_from(span(skyline::audio::DownMix(span(samples).cast<skyline::audio::Surround51Sample>())));
samples.resize((samples.size() / constant::SurroundChannelCount) * constant::StereoChannelCount);
}
}
std::vector<i16> &Voice::GetBufferData(u32 maxSamples, u32 &outOffset, u32 &outSize) {