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audio_renderer: Implement 6 channel downmixing

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Adds 6 channel support by downmixing to 2 channels. Nintendo does this in their DSP firmware however the downmix coefficients are different depending on the internal state. This will be updated in a later PR.
This commit is contained in:
David Marcec
2020-04-20 21:57:38 +10:00
parent 6de36f0b61
commit 6dec0cfff6
1 changed files with 15 additions and 0 deletions
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15
src/audio_core/audio_renderer.cpp
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@@ -297,6 +297,21 @@ void AudioRenderer::VoiceState::RefreshBuffer(Core::Memory::Memory& memory) {
samples = std::move(new_samples);
break;
}
case 6: {
samples.resize((new_samples.size() / 6) * 2);
const std::size_t sample_count = samples.size() / 2;
for (std::size_t index = 0; index < sample_count; ++index) {
const auto FL = static_cast<double>(new_samples[index * 6]);
const auto FR = static_cast<double>(new_samples[index * 6 + 1]);
const auto FC = static_cast<double>(new_samples[index * 6 + 2]);
const auto BL = static_cast<double>(new_samples[index * 6 + 4]);
const auto BR = static_cast<double>(new_samples[index * 6 + 5]);
samples[index * 2] = static_cast<s16>(0.3694 * FL + 0.2612 * FC + 0.3694 * BL);
samples[index * 2 + 1] = static_cast<s16>(0.3694 * FR + 0.2612 * FC + 0.3694 * BR);
}
break;
}
default:
UNIMPLEMENTED_MSG("Unimplemented channel_count={}", info.channel_count);
break;