1 files changed, 46 insertions, 0 deletions
diff --git a/src/audio_core/renderer/effect/compressor.cpp b/src/audio_core/renderer/effect/compressor.cpp
index fea0aefcf..3b32670f7 100644
--- a/src/audio_core/renderer/effect/compressor.cpp
+++ b/src/audio_core/renderer/effect/compressor.cpp
@@ -1,6 +1,8 @@
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2025 citron Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <cmath>
 #include "audio_core/renderer/effect/compressor.h"
 
 namespace AudioCore::Renderer {
@@ -37,4 +39,48 @@ CpuAddr CompressorInfo::GetWorkbuffer(s32 index) {
     return GetSingleBuffer(index);
 }
 
+CompressorEffect::CompressorEffect(std::size_t sample_count_) : sample_count{sample_count_} {}
+
+void CompressorEffect::Process(std::span<f32> output_buffer, std::span<const f32> input_buffer) {
+    if (!IsEnabled() || !parameter.IsChannelCountValid()) {
+        std::copy(input_buffer.begin(), input_buffer.end(), output_buffer.begin());
+        return;
+    }
+
+    if (!result_state.empty() && parameter.statistics_reset) {
+        statistics.Reset(static_cast<u16>(parameter.channel_count));
+    }
+
+    // Process audio with compressor effect
+    for (u32 sample_index = 0; sample_index < sample_count; sample_index++) {
+        float mean = 0.0f;
+        for (u32 channel = 0; channel < parameter.channel_count; channel++) {
+            const auto sample = input_buffer[sample_index * parameter.channel_count + channel];
+            mean += sample * sample;
+        }
+        mean /= static_cast<float>(parameter.channel_count);
+
+        // Calculate compression gain
+        float compression_gain = 1.0f;
+        if (mean > parameter.threshold) {
+            compression_gain = parameter.threshold / mean;
+            compression_gain = std::pow(compression_gain, 1.0f - (1.0f / parameter.ratio));
+        }
+
+        // Apply compression
+        for (u32 channel = 0; channel < parameter.channel_count; channel++) {
+            const auto in_sample = input_buffer[sample_index * parameter.channel_count + channel];
+            const auto out_sample = in_sample * compression_gain * parameter.input_gain;
+            output_buffer[sample_index * parameter.channel_count + channel] = out_sample;
+
+            // Update statistics if enabled
+            if (parameter.statistics_enabled) {
+                statistics.maximum_mean = std::max(statistics.maximum_mean, mean);
+                statistics.minimum_gain = std::min(statistics.minimum_gain, compression_gain);
+                statistics.last_samples[channel] = std::abs(in_sample) * (1.0f / 32768.0f);
+            }
+        }
+    }
+}
+
 } // namespace AudioCore::Renderer