feat: voice compressor with RMS+peak leveling, sliding window envelope, rate-limited gain

tools/chatgui/CMakeLists.txt

@@ -77,6 +77,7 @@ add_executable(chatgui
     src/soundsettingspage.cpp
     src/sound_manager.cpp
     src/audiorecorder.cpp
+    src/audiocompressor.cpp
     src/voicemessageencoder.cpp
     src/voiceplayback.cpp
     src/audiodevicesettingspage.cpp

tools/chatgui/src/audiocompressor.cpp

@@ -0,0 +1,147 @@
+#include "audiocompressor.h"
+
+#include <QDebug>
+#include <cmath>
+#include <algorithm>
+#include <cstring>
+
+void AudioCompressor::configure(const Config& cfg) {
+    m_cfg = cfg;
+    m_blockSamples = m_cfg.sampleRate * m_cfg.blockDurationMs / 1000 * m_cfg.channels;
+    m_lookbackBlocks = m_cfg.lookbackMs / m_cfg.blockDurationMs;
+    m_lookaheadBlocks = m_cfg.lookaheadMs / m_cfg.blockDurationMs;
+    m_riseFactorPerBlock = powf(m_cfg.riseRatePer500ms, (float)m_cfg.blockDurationMs / 500.0f);
+    m_maxGain = powf(10.0f, m_cfg.maxGainDb / 20.0f);
+    qDebug("AudioCompressor: config rate=%d ch=%d block=%dms window=%dms+%dms maxGain=%.0fdB riseRate=%.1fx/500ms target=%.0fdBFS",
+           m_cfg.sampleRate, m_cfg.channels, m_cfg.blockDurationMs,
+           m_cfg.lookbackMs, m_cfg.lookaheadMs, m_cfg.maxGainDb,
+           m_cfg.riseRatePer500ms, 20.0f * log10f(m_cfg.targetLevel));
+}
+
+void AudioCompressor::reset() {
+    m_blockLevels.clear();
+    m_pending.clear();
+    m_accumulator.clear();
+    m_output.clear();
+    m_gainSmoothed = 1.0f;
+    m_dbgCounter = 0;
+}
+
+void AudioCompressor::push(const int16_t* samples, size_t count) {
+    if (!m_enabled) {
+        m_output.insert(m_output.end(), samples, samples + count);
+        return;
+    }
+
+    size_t remaining = count;
+    const int16_t* src = samples;
+    while (remaining > 0) {
+        size_t need = (size_t)m_blockSamples - m_accumulator.size();
+        size_t take = std::min(remaining, need);
+        m_accumulator.insert(m_accumulator.end(), src, src + take);
+        src += take;
+        remaining -= take;
+        if (m_accumulator.size() == (size_t)m_blockSamples) {
+            float level = computeBlockLevel(m_accumulator.data(), m_accumulator.size());
+
+            BlockLevel bl;
+            bl.level = level;
+            m_blockLevels.push_back(bl);
+
+            PendingBlock pb;
+            pb.samples = std::move(m_accumulator);
+            pb.levelIndex = m_blockLevels.size() - 1;
+            m_pending.push_back(std::move(pb));
+
+            m_accumulator.clear();
+        }
+    }
+
+    while (m_pending.size() > (size_t)m_lookaheadBlocks) {
+        processPendingBlock();
+    }
+}
+
+float AudioCompressor::computeBlockLevel(const int16_t* samples, size_t count) const {
+    float sumSq = 0.0f;
+    float peak = 0.0f;
+    for (size_t i = 0; i < count; i++) {
+        float v = (float)samples[i] / 32768.0f;
+        sumSq += v * v;
+        float av = fabsf(v);
+        if (av > peak) peak = av;
+    }
+    float rms = sqrtf(sumSq / (float)count);
+    return (rms * 2.0f + peak) / 2.0f;
+}
+
+void AudioCompressor::processPendingBlock() {
+    PendingBlock& block = m_pending.front();
+    size_t idx = block.levelIndex;
+
+    size_t winStart = idx >= (size_t)m_lookbackBlocks ? idx - (size_t)m_lookbackBlocks : 0;
+    size_t winEnd = std::min(idx + (size_t)m_lookaheadBlocks, m_blockLevels.size() - 1);
+
+    float envelope = 0.0f;
+    for (size_t i = winStart; i <= winEnd; i++) {
+        if (m_blockLevels[i].level > envelope) envelope = m_blockLevels[i].level;
+    }
+    if (envelope < 0.0001f) envelope = 0.0001f;
+
+    float G_raw = m_cfg.targetLevel / envelope;
+
+    float G_prev = m_gainSmoothed;
+    if (G_raw > m_gainSmoothed) {
+        float maxRise = m_gainSmoothed * m_riseFactorPerBlock;
+        m_gainSmoothed = std::min(G_raw, maxRise);
+    } else {
+        m_gainSmoothed = G_raw;
+    }
+
+    m_gainSmoothed = std::min(m_gainSmoothed, m_maxGain);
+
+    static int dbgCounter = 0;
+    float gainDb = 20.0f * log10f(m_gainSmoothed);
+    float prevDb = 20.0f * log10f(G_prev > 0.0001f ? G_prev : 0.0001f);
+    if (m_dbgCounter % 25 == 0 || fabsf(gainDb - prevDb) > 3.0f) {
+        qDebug("AudioCompressor: block %zu level=%.4f envelope=%.4f gainRaw=%.1fdB gain=%.1fdB",
+               idx, m_blockLevels[idx].level, envelope, 20.0f * log10f(G_raw), gainDb);
+    }
+    m_dbgCounter++;
+
+    for (size_t i = 0; i < block.samples.size(); i++) {
+        float v = (float)block.samples[i] * m_gainSmoothed;
+        if (v > 32767.0f) v = 32767.0f;
+        if (v < -32768.0f) v = -32768.0f;
+        m_output.push_back((int16_t)(int)v);
+    }
+
+    m_pending.pop_front();
+}
+
+void AudioCompressor::flush() {
+    if (!m_enabled) return;
+
+    if (!m_accumulator.empty()) {
+        float level = computeBlockLevel(m_accumulator.data(), m_accumulator.size());
+
+        BlockLevel bl;
+        bl.level = level;
+        m_blockLevels.push_back(bl);
+
+        PendingBlock pb;
+        pb.samples = std::move(m_accumulator);
+        pb.levelIndex = m_blockLevels.size() - 1;
+        m_pending.push_back(std::move(pb));
+
+        m_accumulator.clear();
+    }
+
+    int remain = (int)m_pending.size();
+    qDebug("AudioCompressor: flush %d pending blocks (gainSmoothed=%.1fdB)", remain,
+           20.0f * log10f(m_gainSmoothed));
+
+    while (!m_pending.empty()) {
+        processPendingBlock();
+    }
+}

tools/chatgui/src/audiocompressor.h

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <vector>
+#include <deque>
+#include <cstdint>
+
+class AudioCompressor {
+public:
+    struct Config {
+        int sampleRate = 48000;
+        int channels = 1;
+        int blockDurationMs = 20;
+        int lookbackMs = 200;
+        int lookaheadMs = 100;
+        float maxGainDb = 30.0f;
+        float riseRatePer500ms = 2.0f;
+        float targetLevel = 0.25f;
+    };
+
+    void configure(const Config& cfg);
+    void reset();
+
+    void setEnabled(bool enabled) { m_enabled = enabled; }
+    bool isEnabled() const { return m_enabled; }
+
+    void push(const int16_t* samples, size_t count);
+    const std::vector<int16_t>& outputBuffer() const { return m_output; }
+    bool hasPending() const { return !m_pending.empty() || !m_accumulator.empty(); }
+    void flush();
+
+private:
+    Config m_cfg;
+    bool m_enabled = true;
+
+    struct BlockLevel {
+        float level;
+    };
+    std::deque<BlockLevel> m_blockLevels;
+
+    struct PendingBlock {
+        std::vector<int16_t> samples;
+        size_t levelIndex;
+    };
+    std::deque<PendingBlock> m_pending;
+    std::vector<int16_t> m_accumulator;
+
+    std::vector<int16_t> m_output;
+
+    int m_blockSamples = 960;
+    int m_lookbackBlocks = 10;
+    int m_lookaheadBlocks = 5;
+    float m_riseFactorPerBlock = 1.0f;
+    float m_maxGain = 31.62f;
+    float m_gainSmoothed = 1.0f;
+    int m_dbgCounter = 0;
+
+    float computeBlockLevel(const int16_t* samples, size_t count) const;
+    void processPendingBlock();
+};

tools/chatgui/src/audiodevicesettingspage.cpp

@@ -1,6 +1,7 @@
 #include "audiodevicesettingspage.h"
 #include "sound_manager.h"
 #include "audiorecorder.h"
+#include "audiocompressor.h"
 #include "voicemessageencoder.h"
 #include "../db/db_manager.h"
 #include "../transport/gui_bridge.h"
@@ -111,6 +112,14 @@ AudioDeviceSettingsPage::AudioDeviceSettingsPage(DbManager* db, QWidget* parent)
     m_codecPresetCombo->setStyleSheet(m_outputCombo->styleSheet());
     layout->addWidget(m_codecPresetCombo);
 
+    /* --- Separator --- */
+    auto* sep4 = new QFrame(this);
+    sep4->setFrameShape(QFrame::HLine);
+    sep4->setStyleSheet("QFrame { color: palette(mid); }");
+    layout->addWidget(sep4);
+
+    buildCompressorUI(layout);
+
     layout->addStretch();
 
     m_levelTimer = new QTimer(this);
@@ -148,6 +157,12 @@ void AudioDeviceSettingsPage::loadFromDb() {
         m_savedOutputIdx = m_db->getUiStateInt("audio_output_device", -1);
         m_savedInputIdx  = m_db->getUiStateInt("audio_input_device", -1);
         m_savedCodecPreset = m_db->getUiStateInt("opus_codec_preset", 1);
+        m_savedCompressorEnabled = m_db->getUiStateInt("compressor_enabled", 0);
+        m_savedCompressorMaxGainDb = m_db->getUiStateInt("compressor_max_gain_db", 30);
+        m_savedCompressorLookbackMs = m_db->getUiStateInt("compressor_lookback_ms", 200);
+        m_savedCompressorLookaheadMs = m_db->getUiStateInt("compressor_lookahead_ms", 100);
+        m_savedCompressorRiseRateTenths = m_db->getUiStateInt("compressor_rise_rate_tenths", 20);
+        m_savedCompressorTargetLevelDb = m_db->getUiStateInt("compressor_target_level_db", -12);
     }
 
     /* Select saved indices */
@@ -163,6 +178,14 @@ void AudioDeviceSettingsPage::loadFromDb() {
         if (m_codecPresetCombo->itemData(i).toInt() == m_savedCodecPreset)
             { m_codecPresetCombo->setCurrentIndex(i); break; }
     }
+
+    m_compressorEnabledCb->setChecked(m_savedCompressorEnabled != 0);
+    m_compressorMaxGainSlider->setValue(m_savedCompressorMaxGainDb);
+    m_compressorLookbackSlider->setValue(m_savedCompressorLookbackMs);
+    m_compressorLookaheadSlider->setValue(m_savedCompressorLookaheadMs);
+    m_compressorRiseRateSlider->setValue(m_savedCompressorRiseRateTenths);
+    m_compressorTargetLevelSlider->setValue(m_savedCompressorTargetLevelDb);
+    updateCompressorLabels();
 }
 
 void AudioDeviceSettingsPage::applyAndSave() {
@@ -186,10 +209,32 @@ void AudioDeviceSettingsPage::applyAndSave() {
 
     VoiceEncoder::setPreset(codecPreset);
 
+    int compEnabled = m_compressorEnabledCb->isChecked() ? 1 : 0;
+    int compMaxGain = m_compressorMaxGainSlider->value();
+    int compLookback = m_compressorLookbackSlider->value();
+    int compLookahead = m_compressorLookaheadSlider->value();
+    int compRiseRateTenths = m_compressorRiseRateSlider->value();
+    int compTargetLevel = m_compressorTargetLevelSlider->value();
+
+    saveKey("compressor_enabled", compEnabled);
+    saveKey("compressor_max_gain_db", compMaxGain);
+    saveKey("compressor_lookback_ms", compLookback);
+    saveKey("compressor_lookahead_ms", compLookahead);
+    saveKey("compressor_rise_rate_tenths", compRiseRateTenths);
+    saveKey("compressor_target_level_db", compTargetLevel);
+
     m_savedOutputIdx = outIdx;
     m_savedInputIdx  = inIdx;
     m_savedCodecPreset = codecPreset;
-    qDebug("AudioDeviceSettings: saved output=%d input=%d codec=%d", outIdx, inIdx, codecPreset);
+    m_savedCompressorEnabled = compEnabled;
+    m_savedCompressorMaxGainDb = compMaxGain;
+    m_savedCompressorLookbackMs = compLookback;
+    m_savedCompressorLookaheadMs = compLookahead;
+    m_savedCompressorRiseRateTenths = compRiseRateTenths;
+    m_savedCompressorTargetLevelDb = compTargetLevel;
+    qDebug("AudioDeviceSettings: saved output=%d input=%d codec=%d compressor=%d gain=%ddB lookback=%d lookahead=%d rise=%.1fx target=%ddB",
+           outIdx, inIdx, codecPreset, compEnabled, compMaxGain, compLookback, compLookahead,
+           (float)compRiseRateTenths / 10.0f, compTargetLevel);
 }
 
 void AudioDeviceSettingsPage::onTestMicToggled() {
@@ -244,3 +289,71 @@ void AudioDeviceSettingsPage::onTestSpeaker() {
         pcm[i] = (int16_t)(12000.0 * sin(2.0 * M_PI * 440.0 * i / sampleRate));
     SoundManager::instance()->playRawPcm(pcm.data(), samples, sampleRate, 1);
 }
+
+void AudioDeviceSettingsPage::buildCompressorUI(QVBoxLayout* layout) {
+    auto* compLabel = new QLabel("Voice Compressor", this);
+    compLabel->setStyleSheet("font-size: 13px; font-weight: bold;");
+    layout->addWidget(compLabel);
+
+    m_compressorEnabledCb = new QCheckBox("Enable compressor (leveler/normalizer)", this);
+    m_compressorEnabledCb->setStyleSheet("font-size: 12px;");
+    layout->addWidget(m_compressorEnabledCb);
+
+    auto makeSliderRow = [&](const QString& name, QSlider*& slider, QLabel*& lbl,
+                             int min, int max, int step) {
+        auto* row = new QHBoxLayout();
+        row->setSpacing(6);
+        auto* textLabel = new QLabel(name, this);
+        textLabel->setFixedWidth(180);
+        textLabel->setStyleSheet("font-size: 12px;");
+        row->addWidget(textLabel);
+        slider = new QSlider(Qt::Horizontal, this);
+        slider->setRange(min, max);
+        slider->setSingleStep(step);
+        slider->setStyleSheet(
+            "QSlider::groove:horizontal { height: 4px; background: palette(mid); border-radius: 2px; }"
+            "QSlider::handle:horizontal { width: 12px; margin: -5px 0; background: palette(highlight); border-radius: 6px; }");
+        row->addWidget(slider, 1);
+        lbl = new QLabel(this);
+        lbl->setFixedWidth(60);
+        lbl->setStyleSheet("font-size: 12px;");
+        lbl->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
+        row->addWidget(lbl);
+        layout->addLayout(row);
+    };
+
+    makeSliderRow("Max gain:", m_compressorMaxGainSlider, m_compressorMaxGainLabel,
+                  0, 30, 1);
+    makeSliderRow("Lookback time:", m_compressorLookbackSlider, m_compressorLookbackLabel,
+                  50, 500, 10);
+    makeSliderRow("Lookahead time:", m_compressorLookaheadSlider, m_compressorLookaheadLabel,
+                  20, 500, 10);
+    makeSliderRow("Rise rate (x/500ms):", m_compressorRiseRateSlider, m_compressorRiseRateLabel,
+                  11, 100, 1);
+    makeSliderRow("Target level:", m_compressorTargetLevelSlider, m_compressorTargetLevelLabel,
+                  -40, 0, 1);
+
+    auto connectSlider = [this](QSlider* slider) {
+        connect(slider, &QSlider::valueChanged, this, &AudioDeviceSettingsPage::updateCompressorLabels);
+    };
+    connectSlider(m_compressorMaxGainSlider);
+    connectSlider(m_compressorLookbackSlider);
+    connectSlider(m_compressorLookaheadSlider);
+    connectSlider(m_compressorRiseRateSlider);
+    connectSlider(m_compressorTargetLevelSlider);
+}
+
+void AudioDeviceSettingsPage::updateCompressorLabels() {
+    if (m_compressorMaxGainLabel)
+        m_compressorMaxGainLabel->setText(QString::number(m_compressorMaxGainSlider->value()) + " dB");
+    if (m_compressorLookbackLabel)
+        m_compressorLookbackLabel->setText(QString::number(m_compressorLookbackSlider->value()) + " ms");
+    if (m_compressorLookaheadLabel)
+        m_compressorLookaheadLabel->setText(QString::number(m_compressorLookaheadSlider->value()) + " ms");
+    if (m_compressorRiseRateLabel) {
+        float v = (float)m_compressorRiseRateSlider->value() / 10.0f;
+        m_compressorRiseRateLabel->setText(QString::number(v, 'f', 1) + "x");
+    }
+    if (m_compressorTargetLevelLabel)
+        m_compressorTargetLevelLabel->setText(QString::number(m_compressorTargetLevelSlider->value()) + " dBFS");
+}

tools/chatgui/src/audiodevicesettingspage.h

@@ -3,9 +3,13 @@
 #include <QComboBox>
 #include <QProgressBar>
 #include <QPushButton>
+#include <QCheckBox>
+#include <QSlider>
+#include <QLabel>
 #include <QTimer>
 class DbManager;
 class AudioRecorder;
+class AudioCompressor;
 
 class AudioDeviceSettingsPage : public QWidget {
     Q_OBJECT
@@ -22,6 +26,8 @@ private slots:
 
 private:
     void stopMicTest();
+    void buildCompressorUI(class QVBoxLayout* layout);
+    void updateCompressorLabels();
 
     DbManager* m_db;
     AudioRecorder* m_testRecorder = nullptr;
@@ -36,4 +42,22 @@ private:
     int m_savedOutputIdx = -1;
     int m_savedInputIdx = -1;
     int m_savedCodecPreset = 1;
+
+    QCheckBox* m_compressorEnabledCb;
+    QSlider* m_compressorMaxGainSlider;
+    QSlider* m_compressorLookbackSlider;
+    QSlider* m_compressorLookaheadSlider;
+    QSlider* m_compressorRiseRateSlider;
+    QSlider* m_compressorTargetLevelSlider;
+    QLabel* m_compressorMaxGainLabel;
+    QLabel* m_compressorLookbackLabel;
+    QLabel* m_compressorLookaheadLabel;
+    QLabel* m_compressorRiseRateLabel;
+    QLabel* m_compressorTargetLevelLabel;
+    int m_savedCompressorEnabled = 0;
+    int m_savedCompressorMaxGainDb = 30;
+    int m_savedCompressorLookbackMs = 200;
+    int m_savedCompressorLookaheadMs = 100;
+    int m_savedCompressorRiseRateTenths = 20;
+    int m_savedCompressorTargetLevelDb = -12;
 };

tools/chatgui/src/audiorecorder.cpp

@@ -1,4 +1,5 @@
 #include "audiorecorder.h"
+#include "audiocompressor.h"
 #include "miniaudio.h"
 #include "sound_manager.h"
 
@@ -16,10 +17,15 @@ void audioCaptureCallback(ma_device* pDevice, void* pOutput, const void* pInput,
     if (!pInput) return;
 
     const int16_t* src = (const int16_t*)pInput;
-    size_t cur = self->m_pcmBuffer.size();
     size_t add = (size_t)frameCount * (size_t)self->m_channels;
+
+    if (self->m_compressor && self->m_compressorEnabled) {
+        self->m_compressor->push(src, add);
+    } else {
+        size_t cur = self->m_pcmBuffer.size();
         self->m_pcmBuffer.resize(cur + add);
         std::memcpy(self->m_pcmBuffer.data() + cur, src, add * sizeof(int16_t));
+    }
 
     float sumSq = 0.0f;
     for (unsigned int i = 0; i < frameCount * (unsigned int)self->m_channels; i++) {
@@ -42,6 +48,11 @@ void audioCaptureCallback(ma_device* pDevice, void* pOutput, const void* pInput,
 AudioRecorder::AudioRecorder(QObject* parent)
     : QObject(parent) {
     g_recorder = this;
+    m_compressor = new AudioCompressor;
+    AudioCompressor::Config cfg;
+    cfg.sampleRate = m_sampleRate;
+    cfg.channels = m_channels;
+    m_compressor->configure(cfg);
     m_durationTimer.setInterval(100);
     connect(&m_durationTimer, &QTimer::timeout, this, [this]() {
         if (m_recording) {
@@ -53,6 +64,8 @@ AudioRecorder::AudioRecorder(QObject* parent)
 
 AudioRecorder::~AudioRecorder() {
     shutdown();
+    delete m_compressor;
+    m_compressor = nullptr;
     if (g_recorder == this) g_recorder = nullptr;
 }
 
@@ -86,6 +99,8 @@ void AudioRecorder::startRecording() {
     m_rmsIdx = 0;
     m_elapsedMs = 0;
 
+    if (m_compressor) m_compressor->reset();
+
     ma_context* ctx = SoundManager::instance()->context();
     if (!ctx) { qWarning("AudioRecorder: no audio context"); return; }
 
@@ -142,10 +157,14 @@ void AudioRecorder::stopRecording() {
         ma_device_uninit(m_device);
         m_deviceStarted = false;
     }
-
     m_recording = false;
+
+    if (m_compressor && m_compressorEnabled) m_compressor->flush();
+
     int duration = m_elapsedMs;
-    qDebug("AudioRecorder: recording stopped, duration=%dms, pcmSamples=%zu", duration, m_pcmBuffer.size());
+    size_t bufSize = (m_compressor && m_compressorEnabled) ? m_compressor->outputBuffer().size() : m_pcmBuffer.size();
+    qDebug("AudioRecorder: recording stopped, duration=%dms, pcmSamples=%zu, compressor=%d",
+           duration, bufSize, m_compressorEnabled ? 1 : 0);
     emit recordingStopped(duration);
     emit durationChanged(0);
 }
@@ -159,3 +178,14 @@ float AudioRecorder::peakLevel() const {
     m_peakLevel = 0.0f;
     return v;
 }
+
+const std::vector<int16_t>& AudioRecorder::buffer() const {
+    if (m_compressor && m_compressorEnabled) return m_compressor->outputBuffer();
+    return m_pcmBuffer;
+}
+
+void AudioRecorder::setCompressorEnabled(bool enabled) {
+    m_compressorEnabled = enabled;
+    if (m_compressor) m_compressor->setEnabled(enabled);
+    qDebug("AudioRecorder: compressor %s", enabled ? "enabled" : "disabled");
+}

tools/chatgui/src/audiorecorder.h

@@ -7,6 +7,7 @@
 #include <cstdint>
 
 struct ma_device;
+class AudioCompressor;
 
 class AudioRecorder : public QObject {
     Q_OBJECT
@@ -27,10 +28,14 @@ public:
 
     float peakLevel() const;
 
-    const std::vector<int16_t>& buffer() const { return m_pcmBuffer; }
+    const std::vector<int16_t>& buffer() const;
     const std::vector<float>& waveformLevels() const { return m_waveformLevels; }
     int durationMs() const;
 
+    AudioCompressor* compressor() const { return m_compressor; }
+    void setCompressorEnabled(bool enabled);
+    bool isCompressorEnabled() const { return m_compressorEnabled; }
+
 signals:
     void recordingStarted();
     void recordingStopped(int durationMs);
@@ -53,5 +58,8 @@ private:
     QTimer m_durationTimer;
     int m_elapsedMs = 0;
 
+    AudioCompressor* m_compressor = nullptr;
+    bool m_compressorEnabled = false;
+
     friend void audioCaptureCallback(ma_device* pDevice, void* pOutput, const void* pInput, unsigned int frameCount);
 };

tools/chatgui/src/mainwindow.cpp

@@ -9,6 +9,7 @@
 #include "invite_link.h"
 #include "sound_manager.h"
 #include "audiorecorder.h"
+#include "audiocompressor.h"
 #include "voicemessageencoder.h"
 #include "animtimer.h"
 #include "../db/db_manager.h"
@@ -25,6 +26,7 @@
 #include <QFile>
 #include <QTextStream>
 #include <QDir>
+#include <cmath>
 
 extern "C" {
 #include "../transport/chat_core.h"
@@ -207,9 +209,22 @@ void MainWindow::setupSoundFromConfig() {
         if (m_db && m_db->isOpen()) {
             m_recorder->setCaptureDeviceIndex(m_db->getUiStateInt("audio_input_device", -1));
             VoiceEncoder::setPreset(m_db->getUiStateInt("opus_codec_preset", 1));
+
+            int compEnabled = m_db->getUiStateInt("compressor_enabled", 0);
+            m_recorder->setCompressorEnabled(compEnabled != 0);
+            if (m_recorder->compressor()) {
+                AudioCompressor::Config compCfg;
+                compCfg.maxGainDb = (float)m_db->getUiStateInt("compressor_max_gain_db", 30);
+                compCfg.lookbackMs = m_db->getUiStateInt("compressor_lookback_ms", 200);
+                compCfg.lookaheadMs = m_db->getUiStateInt("compressor_lookahead_ms", 100);
+                compCfg.riseRatePer500ms = (float)m_db->getUiStateInt("compressor_rise_rate_tenths", 20) / 10.0f;
+                compCfg.targetLevel = powf(10.0f, (float)m_db->getUiStateInt("compressor_target_level_db", -12) / 20.0f);
+                m_recorder->compressor()->configure(compCfg);
+            }
         }
-        qDebug("MainWindow: AudioRecorder initialized (captureDevice=%d, opusPreset=%d)",
+        qDebug("MainWindow: AudioRecorder initialized (captureDevice=%d, opusPreset=%d, compressor=%d)",
-               m_recorder->captureDeviceIndex(), VoiceEncoder::preset());
+               m_recorder->captureDeviceIndex(), VoiceEncoder::preset(),
+               m_recorder->isCompressorEnabled() ? 1 : 0);
     }
 }