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audio_core: Preserve front channel volume after 6 to 2 downmix

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Many games report 6 channel output while only providing data for 2. We only output 2-channel audio regardless, and in the downmixing, front left/right only provide 36% of their volume. This is done assuming all of the other channels also contain valid data, but in many games they don't. This PR alters the downmixing to preserve front left/right, so volume is not lost.

This improves volume in Link's Awakening, New Super Mario Bros U, Disgaea 6, Super Kirby Clash.
This commit is contained in:
Kelebek1 2021-07-07 14:56:23 +01:00
parent 2eb018c80f
commit 7636fefb71
5 changed files with 81 additions and 75 deletions
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15
src/audio_core/sink_context.cpp
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@ -15,10 +15,17 @@ std::size_t SinkContext::GetCount() const {
void SinkContext::UpdateMainSink(const SinkInfo::InParams& in) {
ASSERT(in.type == SinkTypes::Device);
has_downmix_coefs = in.device.down_matrix_enabled;
if (has_downmix_coefs) {
if (in.device.down_matrix_enabled) {
downmix_coefficients = in.device.down_matrix_coef;
} else {
downmix_coefficients = {
1.0f, // front
0.707f, // center
0.0f, // lfe
0.707f, // back
};
}
in_use = in.in_use;
use_count = in.device.input_count;
buffers = in.device.input;
@ -34,10 +41,6 @@ std::vector<u8> SinkContext::OutputBuffers() const {
return buffer_ret;
}
bool SinkContext::HasDownMixingCoefficients() const {
return has_downmix_coefs;
}
const DownmixCoefficients& SinkContext::GetDownmixCoefficients() const {
return downmix_coefficients;
}