1 files changed, 45 insertions, 0 deletions
diff --git a/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.cpp b/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.cpp
new file mode 100644
index 000000000..b3c3ba4ba
--- /dev/null
+++ b/src/audio_core/renderer/command/effect/multi_tap_biquad_filter.cpp
@@ -0,0 +1,45 @@
+// 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/effect/biquad_filter.h"
+#include "audio_core/renderer/command/effect/multi_tap_biquad_filter.h"
+
+namespace AudioCore::AudioRenderer {
+
+void MultiTapBiquadFilterCommand::Dump([[maybe_unused]] const ADSP::CommandListProcessor& processor,
+                                       std::string& string) {
+    string += fmt::format(
+        "MultiTapBiquadFilterCommand\n\tinput {:02X}\n\toutput {:02X}\n\tneeds_init ({}, {})\n",
+        input, output, needs_init[0], needs_init[1]);
+}
+
+void MultiTapBiquadFilterCommand::Process(const ADSP::CommandListProcessor& processor) {
+    if (filter_tap_count > MaxBiquadFilters) {
+        LOG_ERROR(Service_Audio, "Too many filter taps! {}", filter_tap_count);
+        filter_tap_count = MaxBiquadFilters;
+    }
+
+    auto input_buffer{
+        processor.mix_buffers.subspan(input * processor.sample_count, processor.sample_count)};
+    auto output_buffer{
+        processor.mix_buffers.subspan(output * processor.sample_count, processor.sample_count)};
+
+    // TODO: Fix this, currently just applies the filter to the input twice,
+    // and doesn't chain the biquads together at all.
+    for (u32 i = 0; i < filter_tap_count; i++) {
+        auto state{reinterpret_cast<VoiceState::BiquadFilterState*>(states[i])};
+        if (needs_init[i]) {
+            std::memset(state, 0, sizeof(VoiceState::BiquadFilterState));
+        }
+
+        ApplyBiquadFilterFloat(output_buffer, input_buffer, biquads[i].b, biquads[i].a, *state,
+                               processor.sample_count);
+    }
+}
+
+bool MultiTapBiquadFilterCommand::Verify(const ADSP::CommandListProcessor& processor) {
+    return true;
+}
+
+} // namespace AudioCore::AudioRenderer