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audio: skip coefficient normalization for downmix

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This commit is contained in:
Liam 2023-12-16 12:54:40 -05:00
parent ffbba74c91
commit 6851e93296
1 changed files with 2 additions and 4 deletions
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6
src/audio_core/sink/sink_stream.cpp
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@ -42,11 +42,9 @@ void SinkStream::AppendBuffer(SinkBuffer& buffer, std::span<s16> samples) {
// We're given 6 channels, but our device only outputs 2, so downmix.
// Front = 1.0
// Center = 0.596
// Back = 0.707
// LFE = 0.354
// 1.0 + 0.596 + 0.707 + 0.354 = 2.657, 1/2.657 = 0.37636f downscale coefficient
static constexpr std::array<f32, 4> down_mix_coeff{0.37636f, 0.22431056f, 0.13323144f,
0.26608652f};
// Back = 0.707
static constexpr std::array<f32, 4> down_mix_coeff{1.0, 0.596f, 0.354f, 0.707f};
for (u32 read_index = 0, write_index = 0; read_index < samples.size();
read_index += system_channels, write_index += device_channels) {