1 files changed, 74 insertions, 0 deletions

diff --git a/src/audio_core/renderer/command/resample/downmix_6ch_to_2ch.cpp b/src/audio_core/renderer/command/resample/downmix_6ch_to_2ch.cpp
new file mode 100644
index 000000000..1fd90308a
--- /dev/null
+++ b/src/audio_core/renderer/command/resample/downmix_6ch_to_2ch.cpp
@@ -0,0 +1,74 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "audio_core/renderer/adsp/command_list_processor.h"
+#include "audio_core/renderer/command/resample/downmix_6ch_to_2ch.h"
+
+namespace AudioCore::AudioRenderer {
+
+void DownMix6chTo2chCommand::Dump([[maybe_unused]] const ADSP::CommandListProcessor& processor,
+                                  std::string& string) {
+    string += fmt::format("DownMix6chTo2chCommand\n\tinputs:  ");
+    for (u32 i = 0; i < MaxChannels; i++) {
+        string += fmt::format("{:02X}, ", inputs[i]);
+    }
+    string += "\n\toutputs: ";
+    for (u32 i = 0; i < MaxChannels; i++) {
+        string += fmt::format("{:02X}, ", outputs[i]);
+    }
+    string += "\n";
+}
+
+void DownMix6chTo2chCommand::Process(const ADSP::CommandListProcessor& processor) {
+    auto in_front_left{
+        processor.mix_buffers.subspan(inputs[0] * processor.sample_count, processor.sample_count)};
+    auto in_front_right{
+        processor.mix_buffers.subspan(inputs[1] * processor.sample_count, processor.sample_count)};
+    auto in_center{
+        processor.mix_buffers.subspan(inputs[2] * processor.sample_count, processor.sample_count)};
+    auto in_lfe{
+        processor.mix_buffers.subspan(inputs[3] * processor.sample_count, processor.sample_count)};
+    auto in_back_left{
+        processor.mix_buffers.subspan(inputs[4] * processor.sample_count, processor.sample_count)};
+    auto in_back_right{
+        processor.mix_buffers.subspan(inputs[5] * processor.sample_count, processor.sample_count)};
+
+    auto out_front_left{
+        processor.mix_buffers.subspan(outputs[0] * processor.sample_count, processor.sample_count)};
+    auto out_front_right{
+        processor.mix_buffers.subspan(outputs[1] * processor.sample_count, processor.sample_count)};
+    auto out_center{
+        processor.mix_buffers.subspan(outputs[2] * processor.sample_count, processor.sample_count)};
+    auto out_lfe{
+        processor.mix_buffers.subspan(outputs[3] * processor.sample_count, processor.sample_count)};
+    auto out_back_left{
+        processor.mix_buffers.subspan(outputs[4] * processor.sample_count, processor.sample_count)};
+    auto out_back_right{
+        processor.mix_buffers.subspan(outputs[5] * processor.sample_count, processor.sample_count)};
+
+    for (u32 i = 0; i < processor.sample_count; i++) {
+        const auto left_sample{(in_front_left[i] * down_mix_coeff[0] +
+                                in_center[i] * down_mix_coeff[1] + in_lfe[i] * down_mix_coeff[2] +
+                                in_back_left[i] * down_mix_coeff[3])
+                                   .to_int()};
+
+        const auto right_sample{(in_front_right[i] * down_mix_coeff[0] +
+                                 in_center[i] * down_mix_coeff[1] + in_lfe[i] * down_mix_coeff[2] +
+                                 in_back_right[i] * down_mix_coeff[3])
+                                    .to_int()};
+
+        out_front_left[i] = left_sample;
+        out_front_right[i] = right_sample;
+    }
+
+    std::memset(out_center.data(), 0, out_center.size_bytes());
+    std::memset(out_lfe.data(), 0, out_lfe.size_bytes());
+    std::memset(out_back_left.data(), 0, out_back_left.size_bytes());
+    std::memset(out_back_right.data(), 0, out_back_right.size_bytes());
+}
+
+bool DownMix6chTo2chCommand::Verify(const ADSP::CommandListProcessor& processor) {
+    return true;
+}
+
+} // namespace AudioCore::AudioRenderer