feat(dsp): refine audio processing and visualizer rendering

.github/workflows/gradle-publish.yml

@@ -12,6 +12,7 @@ env:
   ANDROID_HOME: /usr/local/lib/android/sdk/
   APK_PATH: app/build/outputs/apk/release/Radio.apk
   APKSIGNER: /usr/local/lib/android/sdk/build-tools/34.0.0/apksigner
+  ZIPALIGN: /usr/local/lib/android/sdk/build-tools/34.0.0/zipalign
 
 jobs:
   build:
@@ -42,7 +43,7 @@ jobs:
         #if: steps.cache-android-sdk.outputs.cache-hit != 'true'
         uses: android-actions/setup-android@v4
         with:
-          packages: ''
+          packages: 'ndk;29.0.14206865'
 
       - name: Grant execute permission for gradlew
         run: chmod +x ./gradlew
@@ -55,7 +56,7 @@ jobs:
 
       - name: Zipalign APK
         run: |
-          /usr/local/lib/android/sdk/build-tools/34.0.0/zipalign -v -p 4 ${{ env.APK_PATH }} app-release-aligned.apk
+          ${{ env.ZIPALIGN }} -v -p 4 ${{ env.APK_PATH }} app-release-aligned.apk
 
       - name: Sign APK
         env:

.gitignore

@@ -6,4 +6,5 @@
 /build
 /captures
 /gradle/gradle-daemon-jvm.properties
-/.kotlin
+/.kotlin
+/app/.cxx/

.vscode/c_cpp_properties.json

@@ -0,0 +1,16 @@
+{
+    "configurations": [
+        {
+            "name": "Android",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE",
+                "_UNICODE"
+            ]
+        }
+    ],
+    "version": 4
+}

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "C_Cpp.default.compilerPath": ""
+}

README.md

@@ -9,7 +9,7 @@
 ### ℹ️ About Radio
 **Radio is an application with a minimalist approach to listening to radio over the Internet.** <br>
 **Radio only offers a very basic search option, and it imports audio streaming links when you tap them in a web browser.** <br>
-**Radio now also supports Android TV (Beta).** <br>
+**Radio now also supports Android TV (Beta) and Cast to Devices (Beta).** <br>
 **Pull request are welcome at any time.**<br>
 
 **Radio is free software. It is released under the [GPLv3 open source license](https://opensource.org/licenses/GPL-3.0).**

app/build.gradle

@@ -19,9 +19,14 @@ android {
         applicationId 'com.michatec.radio'
         minSdk 28
         targetSdk 36
-        versionCode 144
+        versionCode 145
-        versionName '14.4'
+        versionName '14.5'
         resourceConfigurations += ['en', 'de', 'el', 'nl', 'pl', 'ru','uk', 'ja', 'da', 'fr']
+        externalNativeBuild {
+            cmake {
+                cppFlags ''
+            }
+        }
     }
 
     compileOptions {
@@ -49,6 +54,13 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
+    ndkVersion "29.0.14206865"
+    externalNativeBuild {
+        cmake {
+            path file('src/main/cpp/CMakeLists.txt')
+            version '3.22.1'
+        }
+    }
 }
 
 dependencies {
@@ -57,6 +69,7 @@ dependencies {
     // Google Stuff //
     implementation libs.material
     implementation libs.gson
+    implementation libs.play.services.cast.framework
 
     // AndroidX Stuff //
     implementation libs.core.ktx
@@ -67,6 +80,7 @@ dependencies {
     implementation libs.media3.exoplayer
     implementation libs.media3.exoplayer.hls
     implementation libs.media3.session
+    implementation libs.media3.cast
     implementation libs.media3.datasource.okhttp
     implementation libs.navigation.fragment.ktx
     implementation libs.navigation.ui.ktx

app/src/main/AndroidManifest.xml

@@ -32,7 +32,6 @@
         tools:targetApi="33">
 
         <!-- ANDROID AUTO SUPPORT -->
-        <!--  https://developer.android.com/training/auto/audio/ -->
         <meta-data
             android:name="com.google.android.gms.car.application"
             android:resource="@xml/automotive_app_desc" />
@@ -40,6 +39,17 @@
             android:name="com.google.android.gms.car.notification.SmallIcon"
             android:resource="@mipmap/ic_launcher" />
 
+        <!-- GOOGLE CAST SUPPORT -->
+        <receiver android:name="androidx.mediarouter.media.MediaTransferReceiver" />
+        <meta-data
+            android:name="com.google.android.gms.cast.framework.OPTIONS_PROVIDER_CLASS_NAME"
+            android:value="com.michatec.radio.CastOptionsProvider" />
+
+        <activity
+            android:name=".ExpandedControllerActivity"
+            android:exported="false"
+            android:launchMode="singleTask" />
+
         <!-- Main activity for radio station playback on phone and TV -->
         <activity
             android:name=".MainActivity"
@@ -48,54 +58,41 @@
             android:theme="@style/SplashTheme"
             android:exported="true">
 
-            <!-- react to main intents -->
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
                 <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
             </intent-filter>
 
-            <!-- react to be recognized as a music player -->
             <intent-filter>
                 <action android:name="android.intent.action.MUSIC_PLAYER" />
                 <category android:name="android.intent.category.CATEGORY_APP_MUSIC" />
             </intent-filter>
 
-            <!-- react to voice searches, like "Play Security Now" -->
             <intent-filter>
                 <action android:name="android.media.action.MEDIA_PLAY_FROM_SEARCH" />
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
 
-            <!-- react to playlist-links based on file extension -->
-            <!-- This is intended as an App Link for specific extensions -->
             <intent-filter android:autoVerify="true">
                 <action android:name="android.intent.action.VIEW" />
-
                 <category android:name="android.intent.category.BROWSABLE" />
                 <category android:name="android.intent.category.DEFAULT" />
-
                 <data android:scheme="http" />
                 <data android:scheme="https" />
-                <data android:host="*"
+                <data android:host="*" tools:ignore="AppLinkUrlError" />
-                    tools:ignore="AppLinkUrlError" />
                 <data android:pathPattern=".*\\.m3u" />
                 <data android:pathPattern=".*\\.m3u8" />
                 <data android:pathPattern=".*\\.pls" />
             </intent-filter>
 
-            <!-- react to playlist-links based on mimetype -->
-            <!-- Note: MIME types prevent strict App Link verification, but are kept as requested -->
             <intent-filter android:autoVerify="false">
                 <action android:name="android.intent.action.VIEW" />
-
                 <category android:name="android.intent.category.BROWSABLE" />
                 <category android:name="android.intent.category.DEFAULT" />
-
                 <data android:scheme="http" />
                 <data android:scheme="https" />
-                <data android:host="*"
+                <data android:host="*" tools:ignore="AppLinkUrlError" />
-                    tools:ignore="AppLinkUrlError" />
                 <data android:mimeType="audio/x-scpls" />
                 <data android:mimeType="audio/mpegurl" />
                 <data android:mimeType="audio/x-mpegurl" />
@@ -106,11 +103,9 @@
                 <data android:mimeType="application/octet-stream" />
             </intent-filter>
 
-            <!-- react to hls playlist-links based on mimetype -->
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />
                 <category android:name="android.intent.category.DEFAULT" />
-
                 <data android:scheme="content" />
                 <data android:host="*" />
                 <data android:mimeType="audio/x-scpls" />
@@ -122,20 +117,16 @@
                 <data android:mimeType="application/vnd.apple.mpegurl.audio" />
             </intent-filter>
 
-            <!-- react to "start player service" intents -->
             <intent-filter>
                 <action android:name="com.michatec.radio.action.START_PLAYER_SERVICE" />
             </intent-filter>
 
-            <!-- App Shortcuts -->
             <meta-data
                 android:name="android.app.shortcuts"
                 android:resource="@xml/shortcuts" />
 
         </activity>
 
-
-        <!-- Player Service -->
         <service
             android:name=".PlayerService"
             android:enabled="true"
@@ -149,8 +140,6 @@
             </intent-filter>
         </service>
 
-
-        <!-- handles completed downloads -->
         <receiver
             android:name=".helpers.DownloadFinishedReceiver"
             android:exported="true">
@@ -159,8 +148,6 @@
             </intent-filter>
         </receiver>
 
-
-        <!-- handles media buttons -->
         <receiver
             android:name="androidx.media.session.MediaButtonReceiver"
             android:exported="true">
@@ -169,8 +156,6 @@
             </intent-filter>
         </receiver>
 
-
-        <!-- file provider -->
         <provider
             android:name="androidx.core.content.FileProvider"
             android:authorities="${applicationId}.provider"

app/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,42 @@
+
+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html.
+# For more examples on how to use CMake, see https://github.com/android/ndk-samples.
+
+# Sets the minimum CMake version required for this project.
+cmake_minimum_required(VERSION 3.22.1)
+
+# Declares the project name. The project name can be accessed via ${ PROJECT_NAME},
+# Since this is the top level CMakeLists.txt, the project name is also accessible
+# with ${CMAKE_PROJECT_NAME} (both CMake variables are in-sync within the top level
+# build script scope).
+project("radio")
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+#
+# In this top level CMakeLists.txt, ${CMAKE_PROJECT_NAME} is used to define
+# the target library name; in the sub-module's CMakeLists.txt, the project name
+# is preferred for the same purpose.
+#
+# In order to load a library into your app from Java/Kotlin, you must call
+# System.loadLibrary() and pass the name of the library defined here;
+# for GameActivity/NativeActivity derived applications, the same library name must be
+# used in the AndroidManifest.xml file.
+add_library(dsp SHARED
+    dsp.cpp)
+
+add_library(extra SHARED
+    extra.cpp)
+
+# Specifies libraries CMake should link to your target library. You
+# can link libraries from various origins, such as libraries defined in this
+# build script, prebuilt third-party libraries, or Android system libraries.
+target_link_libraries(dsp
+    android
+    log)
+target_link_libraries(extra
+    android
+    log)

app/src/main/cpp/dsp.cpp

@@ -0,0 +1,434 @@
+#include <jni.h>
+#include <vector>
+#include <cmath>
+#include <complex>
+#include <array>
+#include <atomic>
+
+#if defined(__ARM_NEON)
+#include <arm_neon.h>
+#endif
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+static std::atomic<float> gSampleRate(44100.0f);
+static constexpr int FFT_SIZE = 2048;
+static constexpr int NUM_EQ_BANDS = 10;
+static constexpr float INV_32768 = 1.0f / 32768.0f;
+static constexpr float SQRT_2_INV = 0.70710678f;
+static constexpr float DENORMAL_OFFSET = 1e-18f;
+static constexpr float INTERPOLATION_SPEED = 0.1f;
+
+static constexpr std::array<float, NUM_EQ_BANDS> EQ_FREQUENCIES = {
+        31.25f, 62.5f, 125.0f, 250.0f, 500.0f,
+        1000.0f, 2000.0f, 4000.0f, 8000.0f, 16000.0f
+};
+
+struct alignas(16) EqBandInterpolator {
+    std::atomic<float> targetGain{0.0f};
+    std::atomic<float> currentGain{0.0f};
+    float a0 = 1.0f, a1 = 0.0f, a2 = 0.0f, b1 = 0.0f, b2 = 0.0f;
+    float z1 = 0.0f, z2 = 0.0f;
+    bool active = false;
+
+    inline void setTargetGain(float g) { targetGain.store(g, std::memory_order_release); }
+    
+    inline void updateInterpolation() {
+        float target = targetGain.load(std::memory_order_acquire);
+        float current = currentGain.load(std::memory_order_relaxed);
+        float diff = target - current;
+        if (std::abs(diff) > 0.001f) {
+            currentGain.store(current + diff * INTERPOLATION_SPEED, std::memory_order_release);
+        }
+    }
+    
+    inline float process(float x) {
+        if (!active) return x;
+        updateInterpolation();
+        float g = currentGain.load(std::memory_order_acquire);
+        if (std::abs(g) < 0.01f) return x;
+        float y = x * a0 + z1;
+        z1 = x * a1 + z2 - b1 * y + DENORMAL_OFFSET;
+        z2 = x * a2 - b2 * y;
+        return y;
+    }
+    
+    inline void setCoefficients(float sr, float f, float g, float bw) {
+        const bool isActive = std::abs(g) > 0.1f;
+        active = isActive;
+        if (!isActive) return;
+        const float A = powf(10.0f, g / 40.0f);
+        const float w = 2.0f * static_cast<float>(M_PI) * f / sr;
+        const float alpha = sinf(w) * sinhf(logf(2.0f) / 2.0f * bw * w / sinf(w));
+        const float c = cosf(w);
+        const float a0_raw = 1.0f + alpha / A;
+        const float invA0 = 1.0f / a0_raw;
+        a0 = (1.0f + alpha * A) * invA0;
+        a1 = (-2.0f * c) * invA0;
+        a2 = (1.0f - alpha * A) * invA0;
+        b1 = (-2.0f * c) * invA0;
+        b2 = (1.0f - alpha / A) * invA0;
+    }
+};
+
+struct alignas(16) BassFilter {
+    alignas(16) float a0 = 1.2f, a1 = 1.2f, a2 = 1.2f, b1 = 0.0f, b2 = 0.0f;
+    alignas(16) float z1 = 0.0f, z2 = 0.0f;
+    std::atomic<bool> active{false};
+    std::atomic<float> targetGain{0.0f};
+    std::atomic<float> currentGain{0.0f};
+
+    inline void updateInterpolation() {
+        float target = targetGain.load(std::memory_order_acquire);
+        float current = currentGain.load(std::memory_order_relaxed);
+        float diff = target - current;
+        if (std::abs(diff) > 0.001f) {
+            currentGain.store(current + diff * INTERPOLATION_SPEED, std::memory_order_release);
+        }
+    }
+
+    inline float process(float x) {
+        if (!active.load(std::memory_order_acquire)) return x;
+        updateInterpolation();
+        float g = currentGain.load(std::memory_order_acquire);
+        if (std::abs(g) < 0.01f) return x;
+        float y = x * a0 + z1;
+        z1 = x * a1 + z2 - b1 * y + DENORMAL_OFFSET;
+        z2 = x * a2 - b2 * y;
+        if(y > 1.2f) y = 1.2f; else if(y < -1.2f) y = -1.2f;
+        return y;
+    }
+
+    void setCoefficients(float sr, float f, float g, float q){
+        float A=powf(10.0f,g/40.0f);
+        float w=2.0f*static_cast<float>(M_PI)*f/sr;
+        float alpha=sinf(w)/2.0f*sqrtf((A+1.0f/A)*(1.0f/q-1.0f)+2.0f);
+        float c=cosf(w),sqrtA=sqrtf(A);
+        float a0_raw=(A+1.0f)+(A-1.0f)*c+2.0f*sqrtA*alpha;
+        float invA0=1.0f/a0_raw;
+        a0=A*((A+1.0f)-(A-1.0f)*c+2.0f*sqrtA*alpha)*invA0;
+        a1=2.0f*A*((A-1.0f)-(A+1.0f)*c)*invA0;
+        a2=A*((A+1.0f)-(A-1.0f)*c-2.0f*sqrtA*alpha)*invA0;
+        b1=-2.0f*((A-1.0f)+(A+1.0f)*c)*invA0;
+        b2=((A+1.0f)+(A-1.0f)*c-2.0f*sqrtA*alpha)*invA0;
+    }
+    
+    void applyGain(float sr) {
+        float g = currentGain.load(std::memory_order_acquire);
+        setCoefficients(sr, 150.0f, g, SQRT_2_INV);
+    }
+};
+
+template<int SIZE>
+struct CircularBuffer {
+    alignas(16) std::array<float, SIZE> data = {};
+    int pos = 0;
+    [[nodiscard]] inline float read() const { return data[pos]; }
+    inline void write(float v) { data[pos] = v; }
+    inline void advance() { pos = (pos + 1) % SIZE; }
+};
+
+class ReverbOptimized {
+    std::array<CircularBuffer<1116>, 4> combs;
+    std::array<CircularBuffer<556>, 2> allpasses;
+    std::array<float, 4> combFeedback = {0.841f, 0.815f, 0.796f, 0.771f};
+public:
+    std::atomic<float> mix{0.0f};
+    inline float process(float x) {
+        float m = mix.load(std::memory_order_acquire);
+        if (m < 0.01f) return x;
+        float out = 0.0f;
+#pragma GCC unroll 4
+        for (int i = 0; i < 4; i++) {
+            float delayed = combs[static_cast<size_t>(i)].read();
+            out += delayed;
+            combs[static_cast<size_t>(i)].write(x + delayed * combFeedback[static_cast<size_t>(i)] + DENORMAL_OFFSET);
+            combs[static_cast<size_t>(i)].advance();
+        }
+        out *= 0.25f;
+        for (int i = 0; i < 2; i++) {
+            float bufOut = allpasses[static_cast<size_t>(i)].read();
+            float xOut = -0.5f * out + bufOut;
+            allpasses[static_cast<size_t>(i)].write(out + 0.5f * bufOut);
+            allpasses[static_cast<size_t>(i)].advance();
+            out = xOut;
+        }
+        return x * (1.0f - m) + out * m;
+    }
+    inline void processBlock(float* __restrict__ left, float* __restrict__ right, int count) {
+        float m = mix.load(std::memory_order_acquire);
+        if (m < 0.01f) return;
+        for (int i = 0; i < count; i++) {
+            left[i] = process(left[i]);
+            right[i] = process(right[i]);
+        }
+    }
+};
+
+class CompressorOptimized {
+public:
+    std::atomic<float> threshold{0.3f}, ratio{4.0f}, attack{0.08f}, release{0.8f};
+    std::atomic<float> sampleRate{44100.0f};
+    std::atomic<bool> enabled{false};
+private:
+    float envelopeL = 0.0f, envelopeR = 0.0f;
+    float attackCoef = 0.0f, releaseCoef = 0.0f;
+    bool coefficientsValid = false;
+public:
+    inline void updateCoefficients() {
+        if (coefficientsValid) return;
+        float a = attack.load(std::memory_order_acquire);
+        float r = release.load(std::memory_order_acquire);
+        float sr = sampleRate.load(std::memory_order_acquire);
+        attackCoef = expf(-1.0f / (a * sr));
+        releaseCoef = expf(-1.0f / (r * sr));
+        coefficientsValid = true;
+    }
+    inline void processBlock(float* __restrict__ buffer, int count, float& envelope) {
+        updateCoefficients();
+        float th = threshold.load(std::memory_order_acquire);
+        float rt = ratio.load(std::memory_order_acquire);
+        for(int i=0; i<count; i++){
+            float absInput = fabsf(buffer[i]);
+            envelope = (absInput > envelope) ? attackCoef*envelope + (1.0f-attackCoef)*absInput : releaseCoef*envelope + (1.0f-releaseCoef)*absInput;
+            float gain = (envelope>th)? (th + (envelope-th)/rt)/(envelope+1e-9f) : 1.0f;
+            buffer[i]*=gain;
+        }
+    }
+    inline void process(float* __restrict__ left, float* __restrict__ right, int count) {
+        if (!enabled.load(std::memory_order_acquire)) return;
+        processBlock(left, count, envelopeL);
+        processBlock(right, count, envelopeR);
+    }
+};
+
+static std::atomic<bool> gEqEnabled{false};
+static std::atomic<float> gStereoWidth{1.0f};
+alignas(16) std::array<float, 4096> gLeftBuf, gRightBuf;
+alignas(16) std::array<float, 256> gFFTData;
+
+inline void fastFFT(std::complex<float>* __restrict__ data, int n) {
+    for (int i = 1, j = 0; i < n; i++) {
+        int bit = n >> 1;
+        for (; j & bit; bit >>= 1) j ^= bit;
+        j ^= bit;
+        if (i < j) std::swap(data[i], data[j]);
+    }
+    for (int len = 2; len <= n; len <<= 1) {
+        float ang = -2.0f * static_cast<float>(M_PI) / static_cast<float>(len);
+        std::complex<float> wlen(cosf(ang), sinf(ang));
+        for (int i = 0; i < n; i += len) {
+            std::complex<float> w(1.0f);
+            for (int j = 0; j < len / 2; j++) {
+                std::complex<float> u = data[i + j];
+                std::complex<float> v = data[i + j + len / 2] * w;
+                data[i + j] = u + v;
+                data[i + j + len / 2] = u - v;
+                w *= wlen;
+            }
+        }
+    }
+}
+
+inline void applyHannWindowToReal(std::complex<float>* __restrict__ data, int size) {
+    const auto fSizeMinus1 = static_cast<float>(size - 1);
+    for (int i = 0; i < size; i++) {
+        float window = 0.5f * (1.0f - cosf(2.0f * static_cast<float>(M_PI) * static_cast<float>(i) / fSizeMinus1));
+        data[i] = std::complex<float>(data[i].real() * window, data[i].imag());
+    }
+}
+
+inline float fastSoftClip(float x) {
+    float ax = fabsf(x);
+    float sign = x > 0.0f ? 1.0f : -1.0f;
+    if (ax > 1.0f) return sign;
+    return x * (1.5f - 0.5f * x * x);
+}
+
+static EqBandInterpolator gEqL[NUM_EQ_BANDS];
+static EqBandInterpolator gEqR[NUM_EQ_BANDS];
+static BassFilter gBassL, gBassR;
+static CompressorOptimized gCompressor;
+static ReverbOptimized gReverbL, gReverbR;
+static std::array<std::complex<float>, FFT_SIZE> gFFTWork;
+static int gEqUpdateCounter = 0;
+
+inline void updateAllEqBands() {
+    float sr = gSampleRate.load(std::memory_order_acquire);
+    for (int b = 0; b < NUM_EQ_BANDS; b++) {
+        float g = gEqL[b].targetGain.load(std::memory_order_acquire);
+        gEqL[b].setCoefficients(sr, EQ_FREQUENCIES[static_cast<size_t>(b)], g, 1.0f);
+        gEqR[b].setCoefficients(sr, EQ_FREQUENCIES[static_cast<size_t>(b)], g, 1.0f);
+    }
+    bool anyActive = false;
+    for (auto const& band : gEqL) {
+        if (std::abs(band.targetGain.load(std::memory_order_acquire)) > 0.1f) {
+            anyActive = true;
+            break;
+        }
+    }
+    gEqEnabled.store(anyActive, std::memory_order_release);
+}
+
+extern "C" {
+
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setSampleRate(JNIEnv*, jobject, jfloat sr) {
+    gSampleRate.store(sr, std::memory_order_release);
+    gCompressor.sampleRate.store(sr, std::memory_order_release);
+    gBassL.applyGain(sr);
+    gBassR.applyGain(sr);
+    gEqUpdateCounter = 1;
+}
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setDrcEnabled(JNIEnv*, jobject, jboolean e) {
+    gCompressor.enabled.store(e == JNI_TRUE, std::memory_order_release);
+}
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setReverbMix(JNIEnv*, jobject, jfloat m) {
+    gReverbL.mix.store(m, std::memory_order_release);
+    gReverbR.mix.store(m, std::memory_order_release);
+}
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setEqFull(JNIEnv* env, jobject thiz, jfloatArray gains) {
+    if (!gains) return;
+    
+    jsize len = env->GetArrayLength(gains);
+    int bandsToUpdate = std::min(static_cast<int>(len), NUM_EQ_BANDS);
+    
+    jfloat* gainsPtr = env->GetFloatArrayElements(gains, nullptr);
+    if (!gainsPtr) return;
+    
+    for (int b = 0; b < bandsToUpdate; b++) {
+        gEqL[b].setTargetGain(gainsPtr[b]);
+        gEqR[b].setTargetGain(gainsPtr[b]);
+    }
+    
+    gEqUpdateCounter = 1;
+    
+    env->ReleaseFloatArrayElements(gains, gainsPtr, JNI_ABORT);
+}
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setBassBoost(JNIEnv*, jobject, jfloat g) {
+    float scaledGain = g * 4.0f;
+    gBassL.targetGain.store(scaledGain, std::memory_order_release);
+    gBassR.targetGain.store(scaledGain, std::memory_order_release);
+    float sr = gSampleRate.load(std::memory_order_acquire);
+    gBassL.applyGain(sr);
+    gBassR.applyGain(sr);
+    if (std::abs(g) > 0.01f) {
+        gBassL.active.store(true, std::memory_order_release);
+        gBassR.active.store(true, std::memory_order_release);
+    } else {
+        gBassL.active.store(false, std::memory_order_release);
+        gBassR.active.store(false, std::memory_order_release);
+    }
+}
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setStereoWidth(JNIEnv*, jobject, jfloat w) {
+    gStereoWidth.store(fmaxf(0.0f, fminf(w, 2.0f)), std::memory_order_release);
+}
+
+JNIEXPORT jfloatArray JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_getFftData(JNIEnv* env, jobject) {
+    jfloatArray arr = env->NewFloatArray(256);
+    env->SetFloatArrayRegion(arr, 0, 256, gFFTData.data());
+    return arr;
+}
+
+inline void computeLogarithmicFFT(float* output, const std::complex<float>* input, int inputSize) {
+    float sr = gSampleRate.load(std::memory_order_acquire);
+    float binWidth = sr / (2.0f * static_cast<float>(inputSize));
+    constexpr int NUM_BANDS = 256;
+    constexpr float MIN_FREQ = 20.0f;
+    constexpr float MAX_FREQ = 20000.0f;
+    float logMin = logf(MIN_FREQ);
+    float logMax = logf(MAX_FREQ);
+    float logRange = logMax - logMin;
+    
+    for (int b = 0; b < NUM_BANDS; b++) {
+        float f1 = expf(logMin + (logRange * static_cast<float>(b) / static_cast<float>(NUM_BANDS)));
+        float f2 = expf(logMin + (logRange * static_cast<float>(b + 1) / static_cast<float>(NUM_BANDS)));
+        int idx1 = static_cast<int>(f1 / binWidth);
+        int idx2 = static_cast<int>(f2 / binWidth);
+        idx1 = std::max(0, std::min(idx1, inputSize - 1));
+        idx2 = std::max(0, std::min(idx2, inputSize - 1));
+        
+        float sum = 0.0f;
+        int count = idx2 - idx1 + 1;
+        for (int i = idx1; i <= idx2 && i < inputSize; i++) {
+            sum += std::abs(input[i]);
+        }
+        float avg = (count > 0) ? sum / static_cast<float>(count) : 0.0f;
+        output[b] = avg * 0.5f;
+    }
+}
+
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_processAudioDirect(JNIEnv* env, jobject, jobject byteBuffer, jint size) {
+    auto* buffer = static_cast<jshort*>(env->GetDirectBufferAddress(byteBuffer));
+    if (!buffer) return;
+    int numFrames = (size / 2) / 2;
+    if (numFrames > 4096) numFrames = 4096;
+
+    if (gEqUpdateCounter > 0) {
+        updateAllEqBands();
+        gEqUpdateCounter--;
+    }
+
+    for (int i = 0; i < numFrames; i++) {
+        gLeftBuf[static_cast<size_t>(i)] = static_cast<float>(buffer[i * 2]) * INV_32768;
+        gRightBuf[static_cast<size_t>(i)] = static_cast<float>(buffer[i * 2 + 1]) * INV_32768;
+    }
+
+    bool eqEnabled = gEqEnabled.load(std::memory_order_acquire);
+    if (eqEnabled) {
+        for (int i = 0; i < numFrames; i++) {
+            float xL = gLeftBuf[static_cast<size_t>(i)];
+            float xR = gRightBuf[static_cast<size_t>(i)];
+            for (int b = 0; b < NUM_EQ_BANDS; b++) {
+                xL = gEqL[b].process(xL);
+                xR = gEqR[b].process(xR);
+            }
+            gLeftBuf[static_cast<size_t>(i)] = xL;
+            gRightBuf[static_cast<size_t>(i)] = xR;
+        }
+    }
+
+    for(int i = 0; i < numFrames; i++) {
+        gLeftBuf[static_cast<size_t>(i)] = gBassL.process(gLeftBuf[static_cast<size_t>(i)]);
+        gRightBuf[static_cast<size_t>(i)] = gBassR.process(gRightBuf[static_cast<size_t>(i)]);
+    }
+
+    gReverbL.processBlock(gLeftBuf.data(), gRightBuf.data(), numFrames);
+
+    float stereoWidth = gStereoWidth.load(std::memory_order_acquire);
+    if (stereoWidth != 1.0f) {
+        float halfWidth = stereoWidth * 0.5f;
+        for (int j = 0; j < numFrames; j++) {
+            float mid = (gLeftBuf[static_cast<size_t>(j)] + gRightBuf[static_cast<size_t>(j)]) * 0.5f;
+            float side = (gLeftBuf[static_cast<size_t>(j)] - gRightBuf[static_cast<size_t>(j)]) * halfWidth;
+            gLeftBuf[static_cast<size_t>(j)] = mid + side;
+            gRightBuf[static_cast<size_t>(j)] = mid - side;
+        }
+    }
+
+    gCompressor.process(gLeftBuf.data(), gRightBuf.data(), numFrames);
+
+    if (numFrames >= FFT_SIZE) {
+        for (int k = 0; k < FFT_SIZE; k++) {
+            gFFTWork[static_cast<size_t>(k)] = std::complex<float>(gLeftBuf[static_cast<size_t>(k)], 0.0f);
+        }
+    } else {
+        for (int k = 0; k < numFrames; k++) {
+            gFFTWork[static_cast<size_t>(k)] = std::complex<float>(gLeftBuf[static_cast<size_t>(k)], 0.0f);
+        }
+        for (int k = numFrames; k < FFT_SIZE; k++) {
+            gFFTWork[static_cast<size_t>(k)] = std::complex<float>(0.0f, 0.0f);
+        }
+    }
+    
+    applyHannWindowToReal(gFFTWork.data(), FFT_SIZE);
+    fastFFT(gFFTWork.data(), FFT_SIZE);
+    computeLogarithmicFFT(gFFTData.data(), gFFTWork.data(), FFT_SIZE / 2);
+
+    for (int k = 0; k < numFrames; k++) {
+        buffer[k * 2] = static_cast<jshort>(fastSoftClip(gLeftBuf[static_cast<size_t>(k)]) * 32767.0f);
+        buffer[k * 2 + 1] = static_cast<jshort>(fastSoftClip(gRightBuf[static_cast<size_t>(k)]) * 32767.0f);
+    }
+}
+}

app/src/main/cpp/extra.cpp

@@ -0,0 +1,86 @@
+#include <jni.h>
+#include <android/native_window_jni.h>
+#include <android/native_window.h>
+#include <android/log.h>
+#include <vector>
+#include <algorithm>
+#include <cmath>
+
+extern "C" {
+
+JNIEXPORT void JNICALL
+Java_com_michatec_radio_helpers_ExtrasHelper_visualize(JNIEnv *env, jclass clazz, jobject surface, jfloatArray data) {
+    if (!surface) return;
+    ANativeWindow* window = ANativeWindow_fromSurface(env, surface);
+    if (!window) return;
+
+    jsize len = env->GetArrayLength(data);
+    if (len == 0) {
+        ANativeWindow_release(window);
+        return;
+    }
+    jfloat* body = env->GetFloatArrayElements(data, nullptr);
+
+    ANativeWindow_Buffer buffer;
+    ANativeWindow_setBuffersGeometry(window, 0, 0, WINDOW_FORMAT_RGBA_8888);
+
+    if (ANativeWindow_lock(window, &buffer, nullptr) == 0) {
+        auto* pixels = static_cast<uint32_t*>(buffer.bits);
+
+        // Clear background (Dark Grey)
+        for (int y = 0; y < buffer.height; y++) {
+            uint32_t* row = pixels + (y * buffer.stride);
+            for (int x = 0; x < buffer.width; x++) {
+                row[x] = 0xFF121212;
+            }
+        }
+
+        // Draw bars - fewer bins = thicker bars
+        int displayBins = 40;
+        float barWidth = static_cast<float>(buffer.width) / static_cast<float>(displayBins);
+        int padding = static_cast<int>(barWidth * 0.2f);
+        if (padding < 1) padding = 1;
+
+        for (int i = 0; i < displayBins; i++) {
+            // Map display bin to data index
+            int dataIdx = (i * len) / displayBins;
+            float val = body[dataIdx];
+
+            // Use square root to compress the range (so peaks don't hit the top too easily)
+            // and a lower multiplier (0.4f) to reduce overall height
+            float scaledVal = sqrtf(val) * 0.5f;
+            int barHeight = static_cast<int>(scaledVal * static_cast<float>(buffer.height));
+
+            // Cap height at 75% to leave some room at the top
+            int maxH = static_cast<int>(static_cast<float>(buffer.height) * 0.75f);
+            if (barHeight > maxH) barHeight = maxH;
+            if (barHeight < 4) barHeight = 4; // Minimal visible line
+
+            int startX = static_cast<int>(static_cast<float>(i) * barWidth);
+            int endX = static_cast<int>(static_cast<float>(i + 1) * barWidth);
+
+            int drawStartX = startX + padding;
+            int drawEndX = endX - padding;
+            if (drawEndX <= drawStartX) drawEndX = drawStartX + 1;
+
+            int barBottom = buffer.height - 4; // Bottom margin
+            int barTop = barBottom - barHeight;
+
+            for (int x = drawStartX; x < drawEndX; x++) {
+                if (x < 0 || x >= buffer.width) continue;
+                for (int y = barTop; y < barBottom; y++) {
+                    if (y < 0 || y >= buffer.height) continue;
+                    // Using the same color, but now height is controlled
+                    pixels[y * buffer.stride + x] = 0xFFC5DA03;
+                }
+            }
+        }
+
+        ANativeWindow_unlockAndPost(window);
+    }
+
+    env->ReleaseFloatArrayElements(data, body, JNI_ABORT);
+    ANativeWindow_release(window);
+}
+
+} // extern "C"

app/src/main/java/com/michatec/radio/CastOptionsProvider.kt

@@ -0,0 +1,33 @@
+package com.michatec.radio
+
+import android.content.Context
+import com.google.android.gms.cast.CastMediaControlIntent
+import com.google.android.gms.cast.framework.CastOptions
+import com.google.android.gms.cast.framework.OptionsProvider
+import com.google.android.gms.cast.framework.SessionProvider
+import com.google.android.gms.cast.framework.media.CastMediaOptions
+import com.google.android.gms.cast.framework.media.NotificationOptions
+
+@Suppress("unused")
+class CastOptionsProvider : OptionsProvider {
+    override fun getCastOptions(context: Context): CastOptions {
+        val notificationOptions = NotificationOptions.Builder()
+            .setTargetActivityClassName(MainActivity::class.java.name)
+            .build()
+        val mediaOptions = CastMediaOptions.Builder()
+            .setNotificationOptions(notificationOptions)
+            .setExpandedControllerActivityClassName(ExpandedControllerActivity::class.java.name)
+            .build()
+
+        return CastOptions.Builder()
+            .setReceiverApplicationId(CastMediaControlIntent.DEFAULT_MEDIA_RECEIVER_APPLICATION_ID)
+            .setResumeSavedSession(true)
+            .setStopReceiverApplicationWhenEndingSession(true)
+            .setCastMediaOptions(mediaOptions)
+            .build()
+    }
+
+    override fun getAdditionalSessionProviders(context: Context): List<SessionProvider>? {
+        return null
+    }
+}

app/src/main/java/com/michatec/radio/EqualizerFragment.kt

@@ -0,0 +1,68 @@
+package com.michatec.radio
+
+import android.os.Bundle
+import android.view.View
+import androidx.appcompat.app.AppCompatActivity
+import androidx.preference.Preference
+import androidx.preference.PreferenceFragmentCompat
+import androidx.preference.SeekBarPreference
+import com.michatec.radio.helpers.PreferencesHelper
+
+/*
+ * EqualizerFragment class: Handles audio frequency settings with 10-band EQ
+ */
+class EqualizerFragment : PreferenceFragmentCompat() {
+
+    // EQ band frequencies matching radio.cpp
+    private val eqFrequencies = arrayOf("31 Hz", "62 Hz", "125 Hz", "250 Hz", "500 Hz", "1 kHz", "2 kHz", "4 kHz", "8 kHz", "16 kHz")
+    private val eqKeys = arrayOf(
+        Keys.PREF_EQ_LOW,           // Band 0: 31 Hz
+        Keys.PREF_EQ_BAND_1,        // Band 1: 62 Hz
+        Keys.PREF_EQ_BAND_2,        // Band 2: 125 Hz
+        Keys.PREF_EQ_BAND_3,        // Band 3: 250 Hz
+        Keys.PREF_EQ_BAND_4,        // Band 4: 500 Hz
+        Keys.PREF_EQ_BAND_5,        // Band 5: 1 kHz
+        Keys.PREF_EQ_MID,           // Band 6: 2 kHz
+        Keys.PREF_EQ_BAND_6,        // Band 7: 4 kHz
+        Keys.PREF_EQ_BAND_7,        // Band 8: 8 kHz
+        Keys.PREF_EQ_HIGH           // Band 9: 16 kHz
+    )
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        (activity as AppCompatActivity).supportActionBar?.title = getString(R.string.pref_equalizer_title)
+    }
+
+    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
+        val context = preferenceManager.context
+        val screen = preferenceManager.createPreferenceScreen(context)
+
+        // Reset Button
+        val resetPreference = Preference(context)
+        resetPreference.title = getString(R.string.pref_equalizer_reset_title)
+        resetPreference.setIcon(R.drawable.ic_refresh_24dp)
+        resetPreference.setOnPreferenceClickListener {
+            PreferencesHelper.resetEqualizer()
+            for (key in eqKeys) {
+                findPreference<SeekBarPreference>(key)?.value = 0
+            }
+            return@setOnPreferenceClickListener true
+        }
+        screen.addPreference(resetPreference)
+
+        // Create 10-band EQ
+        for (i in eqKeys.indices) {
+            val eqBand = SeekBarPreference(context)
+            eqBand.title = "Equalizer: ${eqFrequencies[i]}"
+            eqBand.key = eqKeys[i]
+            eqBand.setIcon(R.drawable.ic_music_note_24dp)
+            eqBand.min = -12
+            eqBand.max = 12
+            eqBand.showSeekBarValue = true
+            eqBand.setDefaultValue(0)
+            screen.addPreference(eqBand)
+        }
+
+        preferenceScreen = screen
+    }
+}

app/src/main/java/com/michatec/radio/ExpandedControllerActivity.kt

@@ -0,0 +1,14 @@
+package com.michatec.radio
+
+import android.view.Menu
+import com.google.android.gms.cast.framework.CastButtonFactory
+import com.google.android.gms.cast.framework.media.widget.ExpandedControllerActivity
+
+class ExpandedControllerActivity : ExpandedControllerActivity() {
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        super.onCreateOptionsMenu(menu)
+        menuInflater.inflate(R.menu.expanded_controller, menu)
+        CastButtonFactory.setUpMediaRouteButton(this, menu, R.id.media_route_menu_item)
+        return true
+    }
+}

app/src/main/java/com/michatec/radio/Keys.kt

@@ -27,6 +27,7 @@ object Keys {
     const val EXTRA_START_LAST_PLAYED_STATION: String = "START_LAST_PLAYED_STATION"
     const val EXTRA_SLEEP_TIMER_REMAINING: String = "SLEEP_TIMER_REMAINING"
     const val EXTRA_METADATA_HISTORY: String = "METADATA_HISTORY"
+    const val EXTRA_VISUALIZER_DATA: String = "VISUALIZER_DATA"
 
     // arguments
     const val ARG_UPDATE_COLLECTION: String = "ArgUpdateCollection"
@@ -43,6 +44,7 @@ object Keys {
     const val CMD_PLAY_STREAM: String = "PLAY_STREAM"
     const val CMD_REQUEST_SLEEP_TIMER_REMAINING: String = "REQUEST_SLEEP_TIMER_REMAINING"
     const val CMD_REQUEST_METADATA_HISTORY: String = "REQUEST_METADATA_HISTORY"
+    const val CMD_GET_VISUALIZER_DATA: String = "GET_VISUALIZER_DATA"
 
     // preferences
     const val PREF_RADIO_BROWSER_API: String = "RADIO_BROWSER_API"
@@ -60,6 +62,36 @@ object Keys {
     const val PREF_LARGE_BUFFER_SIZE: String = "LARGE_BUFFER_SIZE"
     const val PREF_EDIT_STATIONS: String = "EDIT_STATIONS"
     const val PREF_EDIT_STREAMS_URIS: String = "EDIT_STREAMS_URIS"
+    const val PREF_BASS_BOOST: String = "BASS_BOOST"
+    const val PREF_REVERB: String = "REVERB"
+    const val PREF_DRC: String = "DRC"
+    const val PREF_EQ_LOW: String = "EQ_LOW"
+    const val PREF_EQ_MID: String = "EQ_MID"
+    const val PREF_EQ_HIGH: String = "EQ_HIGH"
+    const val PREF_EQUALIZER: String = "EQUALIZER_SETTINGS"
+    const val PREF_EQ_BAND_1: String = "EQ_BAND_1"
+    const val PREF_EQ_BAND_2: String = "EQ_BAND_2"
+    const val PREF_EQ_BAND_3: String = "EQ_BAND_3"
+    const val PREF_EQ_BAND_4: String = "EQ_BAND_4"
+    const val PREF_EQ_BAND_5: String = "EQ_BAND_5"
+    const val PREF_EQ_BAND_6: String = "EQ_BAND_6"
+    const val PREF_EQ_BAND_7: String = "EQ_BAND_7"
+    const val PREF_EQ_BAND_8: String = "EQ_BAND_8"
+    const val PREF_PRESET_SELECTED: String = "PRESET_SELECTED"
+    const val PREF_PRESET_EQ_BAND_0: String = "PRESET_EQ_BAND_0"
+    const val PREF_PRESET_EQ_BAND_1: String = "PRESET_EQ_BAND_1"
+    const val PREF_PRESET_EQ_BAND_2: String = "PRESET_EQ_BAND_2"
+    const val PREF_PRESET_EQ_BAND_3: String = "PRESET_EQ_BAND_3"
+    const val PREF_PRESET_EQ_BAND_4: String = "PRESET_EQ_BAND_4"
+    const val PREF_PRESET_EQ_BAND_5: String = "PRESET_EQ_BAND_5"
+    const val PREF_PRESET_EQ_BAND_6: String = "PRESET_EQ_BAND_6"
+    const val PREF_PRESET_EQ_BAND_7: String = "PRESET_EQ_BAND_7"
+    const val PREF_PRESET_EQ_BAND_8: String = "PRESET_EQ_BAND_8"
+    const val PREF_PRESET_EQ_BAND_9: String = "PRESET_EQ_BAND_9"
+    const val PREF_PRESET_BASS_BOOST: String = "PRESET_BASS_BOOST"
+    const val PREF_PRESET_REVERB: String = "PRESET_REVERB"
+    const val PREF_PRESET_DRC: String = "PRESET_DRC"
+    const val PREF_PRESET_STEREO_WIDTH: String = "PRESET_STEREO_WIDTH"
 
     // default const values
     const val DEFAULT_SIZE_OF_METADATA_HISTORY: Int = 25
@@ -84,7 +116,6 @@ object Keys {
     const val DIALOG_REMOVE_STATION: Int = 2
     const val DIALOG_UPDATE_STATION_IMAGES: Int = 4
     const val DIALOG_RESTORE_COLLECTION: Int = 5
-    const val DIALOG_THEME_SELECTION: Int = 6
 
     // dialog results
     const val DIALOG_EMPTY_PAYLOAD_STRING: String = ""

app/src/main/java/com/michatec/radio/MainActivity.kt

@@ -27,13 +27,12 @@ class MainActivity : AppCompatActivity() {
     /* Main class variables */
     private lateinit var appBarConfiguration: AppBarConfiguration
 
-
     /* Overrides onCreate from AppCompatActivity */
     override fun onCreate(savedInstanceState: Bundle?) {
         enableEdgeToEdge()
         setTheme(R.style.AppTheme)
         super.onCreate(savedInstanceState)
-        
+
         // Free Android
         FreeDroidWarn.showWarningOnUpgrade(this, BuildConfig.VERSION_CODE)
 
@@ -46,7 +45,8 @@ class MainActivity : AppCompatActivity() {
         // set up action bar
         setSupportActionBar(findViewById(R.id.main_toolbar))
         val toolbar: Toolbar = findViewById(R.id.main_toolbar)
-        val navHostFragment = supportFragmentManager.findFragmentById(R.id.main_host_container) as NavHostFragment
+        val navHostFragment =
+            supportFragmentManager.findFragmentById(R.id.main_host_container) as NavHostFragment
         val navController = navHostFragment.navController
         appBarConfiguration = AppBarConfiguration(navController.graph)
         NavigationUI.setupWithNavController(toolbar, navController, appBarConfiguration)
@@ -69,9 +69,7 @@ class MainActivity : AppCompatActivity() {
     private fun hideLoadingOverlay() {
         findViewById<View>(R.id.loading_layout)?.let { overlay ->
             if (overlay.isVisible) {
-                overlay.animate()
+                overlay.animate().alpha(0f).setDuration(500)
-                    .alpha(0f)
-                    .setDuration(500)
                     .withEndAction { overlay.visibility = View.GONE }
             }
         }
@@ -90,7 +88,8 @@ class MainActivity : AppCompatActivity() {
 
     /* Overrides onSupportNavigateUp from AppCompatActivity */
     override fun onSupportNavigateUp(): Boolean {
-        val navHostFragment = supportFragmentManager.findFragmentById(R.id.main_host_container) as NavHostFragment
+        val navHostFragment =
+            supportFragmentManager.findFragmentById(R.id.main_host_container) as NavHostFragment
         val navController = navHostFragment.navController
         return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
     }

app/src/main/java/com/michatec/radio/PlayerFragment.kt

@@ -402,6 +402,7 @@ class PlayerFragment : Fragment(),
 
     /* Releases MediaController */
     private fun releaseController() {
+        controller?.removeListener(playerListener)
         MediaController.releaseFuture(controllerFuture)
     }
 
@@ -809,7 +810,7 @@ class PlayerFragment : Fragment(),
 
 
     /*
-     * Check for update on github
+     * Check for update on GitHub
      */
     private fun checkForUpdates() {
         val url = getString(R.string.snackbar_github_update_check_url)

app/src/main/java/com/michatec/radio/PlayerService.kt

@@ -10,12 +10,16 @@ import android.os.CountDownTimer
 import android.util.Log
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import androidx.media.MediaBrowserServiceCompat.BrowserRoot.EXTRA_RECENT
+import androidx.media3.cast.CastPlayer
 import androidx.media3.common.*
 import androidx.media3.common.util.UnstableApi
 import androidx.media3.datasource.HttpDataSource
 import androidx.media3.exoplayer.DefaultLoadControl
+import androidx.media3.exoplayer.DefaultRenderersFactory
 import androidx.media3.exoplayer.ExoPlayer
 import androidx.media3.exoplayer.analytics.AnalyticsListener
+import androidx.media3.exoplayer.audio.AudioSink
+import androidx.media3.exoplayer.audio.DefaultAudioSink
 import androidx.media3.exoplayer.source.DefaultMediaSourceFactory
 import androidx.media3.exoplayer.upstream.DefaultAllocator
 import androidx.media3.exoplayer.upstream.DefaultLoadErrorHandlingPolicy
@@ -25,10 +29,7 @@ import com.google.common.collect.ImmutableList
 import com.google.common.util.concurrent.Futures
 import com.google.common.util.concurrent.ListenableFuture
 import com.michatec.radio.core.Collection
-import com.michatec.radio.helpers.AudioHelper
+import com.michatec.radio.helpers.*
-import com.michatec.radio.helpers.CollectionHelper
-import com.michatec.radio.helpers.FileHelper
-import com.michatec.radio.helpers.PreferencesHelper
 import kotlinx.coroutines.*
 import kotlinx.coroutines.Dispatchers.Main
 import java.util.*
@@ -38,13 +39,15 @@ import java.util.*
  * PlayerService class
  */
 @UnstableApi
-class PlayerService : MediaLibraryService() {
+class PlayerService : MediaLibraryService(), SharedPreferences.OnSharedPreferenceChangeListener {
 
     /* Define log tag */
     private val TAG: String = PlayerService::class.java.simpleName
 
     /* Main class variables */
     private lateinit var player: Player
+    private lateinit var exoPlayer: ExoPlayer
+    private lateinit var castPlayer: CastPlayer
     private lateinit var mediaLibrarySession: MediaLibrarySession
     private lateinit var sleepTimer: CountDownTimer
     var sleepTimerTimeRemaining: Long = 0L
@@ -56,6 +59,9 @@ class PlayerService : MediaLibraryService() {
     private var playbackRestartCounter: Int = 0
     private var playLastStation: Boolean = false
     private var manuallyCancelledSleepTimer = false
+    
+    // Native Audio Processor instance
+    private val nativeAudioProcessor = NativeAudioProcessor()
 
 
     /* Overrides onCreate from Service */
@@ -76,6 +82,11 @@ class PlayerService : MediaLibraryService() {
         setMediaNotificationProvider(notificationProvider)
         // fetch the metadata history
         metadataHistory = PreferencesHelper.loadMetadataHistory()
+        
+        // register preference change listener
+        PreferencesHelper.registerPreferenceChangeListener(this)
+        // apply initial audio effects
+        applyAudioEffects()
     }
 
 
@@ -85,7 +96,11 @@ class PlayerService : MediaLibraryService() {
         PreferencesHelper.saveIsPlaying(false)
         player.removeListener(playerListener)
         player.release()
+        exoPlayer.release()
+        castPlayer.release()
         mediaLibrarySession.release()
+        // unregister preference change listener
+        PreferencesHelper.unregisterPreferenceChangeListener(this)
         super.onDestroy()
     }
 
@@ -106,8 +121,26 @@ class PlayerService : MediaLibraryService() {
 
     /* Initializes the ExoPlayer */
     private fun initializePlayer() {
-        val exoPlayer: ExoPlayer = ExoPlayer.Builder(this).apply {
+        val audioAttributes = AudioAttributes.Builder()
-            setAudioAttributes(AudioAttributes.DEFAULT, true)
+            .setContentType(C.AUDIO_CONTENT_TYPE_MUSIC)
+            .setUsage(C.USAGE_MEDIA)
+            .build()
+
+        // Create a RenderersFactory that injects the NativeAudioProcessor
+        val renderersFactory = object : DefaultRenderersFactory(this) {
+            override fun buildAudioSink(
+                context: Context,
+                enableFloatOutput: Boolean,
+                enableAudioTrackPlaybackParams: Boolean
+            ): AudioSink? {
+                return DefaultAudioSink.Builder(context)
+                    .setAudioProcessors(arrayOf(nativeAudioProcessor))
+                    .build()
+            }
+        }
+
+        exoPlayer = ExoPlayer.Builder(this, renderersFactory).apply {
+            setAudioAttributes(audioAttributes, true)
             setHandleAudioBecomingNoisy(true)
             setLoadControl(createDefaultLoadControl(bufferSizeMultiplier))
             setMediaSourceFactory(
@@ -119,8 +152,12 @@ class PlayerService : MediaLibraryService() {
         exoPlayer.addAnalyticsListener(analyticsListener)
         exoPlayer.addListener(playerListener)
 
-        // manually add seek to next and seek to previous since headphones issue them and they are translated to next and previous station
+        // Initialize CastPlayer
-        player = object : ForwardingPlayer(exoPlayer) {
+        castPlayer = CastPlayer.Builder(this).setLocalPlayer(exoPlayer).build()
+
+        // manually add seek to next and seek to previous since headphones issue them, and they are translated to next and previous station
+        // IMPORTANT: Use castPlayer here instead of exoPlayer so the session controls both local and remote playback
+        player = object : ForwardingPlayer(castPlayer) {
             override fun getAvailableCommands(): Player.Commands {
                 return super.getAvailableCommands().buildUpon().add(COMMAND_SEEK_TO_NEXT)
                     .add(COMMAND_SEEK_TO_PREVIOUS).build()
@@ -134,6 +171,7 @@ class PlayerService : MediaLibraryService() {
                 return C.TIME_UNSET // this will hide progress bar for HLS stations in the notification
             }
         }
+        player.addListener(playerListener)
     }
 
 
@@ -246,6 +284,69 @@ class PlayerService : MediaLibraryService() {
     }
 
 
+    /* Applies audio effects based on preferences */
+    private fun applyAudioEffects() {
+        val selectedPreset = PreferencesHelper.loadSelectedPreset()
+        if (selectedPreset.isNotEmpty()) {
+            applyPreset(selectedPreset)
+        } else {
+            // Apply manual settings
+            nativeAudioProcessor.enableBassBoost(PreferencesHelper.loadBassBoost())
+            nativeAudioProcessor.setReverb(PreferencesHelper.loadReverb())
+            nativeAudioProcessor.enableDrc(PreferencesHelper.loadDrcEnabled())
+            nativeAudioProcessor.setWidth(1f)
+            // Apply all 10 EQ bands
+            val eqGains = FloatArray(10)
+            for (i in 0 until 10) {
+                eqGains[i] = PreferencesHelper.loadEqBand(i).toFloat()
+            }
+            nativeAudioProcessor.setEqAll(eqGains)
+        }
+    }
+
+    /* Applies a saved preset */
+    private fun applyPreset(presetName: String) {
+        when (presetName) {
+            getString(R.string.pref_preset_rock) -> nativeAudioProcessor.setPresetRock()
+            getString(R.string.pref_preset_pop) -> nativeAudioProcessor.setPresetPop()
+            getString(R.string.pref_preset_jazz) -> nativeAudioProcessor.setPresetJazz()
+            getString(R.string.pref_preset_flat) -> nativeAudioProcessor.setPresetFlat()
+            else -> {
+                // Custom preset - load from preferences
+                nativeAudioProcessor.enableDrc(PreferencesHelper.loadPresetDrc())
+                nativeAudioProcessor.setReverb(PreferencesHelper.loadPresetReverb())
+                nativeAudioProcessor.setWidth(PreferencesHelper.loadPresetStereoWidth())
+                nativeAudioProcessor.enableBassBoost(PreferencesHelper.loadPresetBassBoost())
+                val eqGains = FloatArray(10)
+                for (i in 0 until 10) {
+                    eqGains[i] = PreferencesHelper.loadPresetEqBand(i).toFloat()
+                }
+                nativeAudioProcessor.setEqAll(eqGains)
+            }
+        }
+    }
+
+    /* Overrides onSharedPreferenceChanged from SharedPreferences.OnSharedPreferenceChangeListener */
+    override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
+        when (key) {
+            Keys.PREF_BASS_BOOST, Keys.PREF_REVERB, Keys.PREF_DRC,
+            Keys.PREF_EQ_LOW, Keys.PREF_EQ_MID, Keys.PREF_EQ_HIGH,
+            Keys.PREF_EQ_BAND_1, Keys.PREF_EQ_BAND_2, Keys.PREF_EQ_BAND_3,
+            Keys.PREF_EQ_BAND_4, Keys.PREF_EQ_BAND_5, Keys.PREF_EQ_BAND_6,
+            Keys.PREF_EQ_BAND_7, Keys.PREF_EQ_BAND_8,
+            Keys.PREF_PRESET_SELECTED,
+            Keys.PREF_PRESET_EQ_BAND_0, Keys.PREF_PRESET_EQ_BAND_1, Keys.PREF_PRESET_EQ_BAND_2,
+            Keys.PREF_PRESET_EQ_BAND_3, Keys.PREF_PRESET_EQ_BAND_4, Keys.PREF_PRESET_EQ_BAND_5,
+            Keys.PREF_PRESET_EQ_BAND_6, Keys.PREF_PRESET_EQ_BAND_7, Keys.PREF_PRESET_EQ_BAND_8,
+            Keys.PREF_PRESET_EQ_BAND_9,
+            Keys.PREF_PRESET_BASS_BOOST, Keys.PREF_PRESET_REVERB,
+            Keys.PREF_PRESET_DRC, Keys.PREF_PRESET_STEREO_WIDTH -> {
+                applyAudioEffects()
+            }
+        }
+    }
+
+
     /*
      * Custom MediaSession Callback that handles player commands
      */
@@ -268,13 +369,13 @@ class PlayerService : MediaLibraryService() {
             session: MediaSession,
             controller: MediaSession.ControllerInfo
         ): MediaSession.ConnectionResult {
-            // add custom commands
             val connectionResult: MediaSession.ConnectionResult = super.onConnect(session, controller)
             val builder: SessionCommands.Builder = connectionResult.availableSessionCommands.buildUpon()
             builder.add(SessionCommand(Keys.CMD_START_SLEEP_TIMER, Bundle.EMPTY))
             builder.add(SessionCommand(Keys.CMD_CANCEL_SLEEP_TIMER, Bundle.EMPTY))
             builder.add(SessionCommand(Keys.CMD_REQUEST_SLEEP_TIMER_REMAINING, Bundle.EMPTY))
             builder.add(SessionCommand(Keys.CMD_REQUEST_METADATA_HISTORY, Bundle.EMPTY))
+            builder.add(SessionCommand(Keys.CMD_GET_VISUALIZER_DATA, Bundle.EMPTY))
             return MediaSession.ConnectionResult.accept(builder.build(), connectionResult.availablePlayerCommands)
         }
 
@@ -361,6 +462,19 @@ class PlayerService : MediaLibraryService() {
                         )
                     )
                 }
+                Keys.CMD_GET_VISUALIZER_DATA -> {
+                    val resultBundle = Bundle()
+                    resultBundle.putFloatArray(
+                        Keys.EXTRA_VISUALIZER_DATA,
+                        nativeAudioProcessor.getVisualizer()
+                    )
+                    return Futures.immediateFuture(
+                        SessionResult(
+                            SessionResult.RESULT_SUCCESS,
+                            resultBundle
+                        )
+                    )
+                }
             }
             return super.onCustomCommand(session, controller, customCommand, args)
         }
@@ -426,35 +540,23 @@ class PlayerService : MediaLibraryService() {
                 isPlaying
             )
 
-            if (isPlaying) {
+            if (!isPlaying) {
-                // playback is active
-            } else {
                 // cancel sleep timer
                 cancelSleepTimer()
                 // reset metadata
                 updateMetadata()
 
-                // playback is not active
+                // Check playback state to decide whether to stop the service
-                // Not playing because playback is paused, ended, suppressed, or the player
-                // is buffering, stopped or failed. Check player.getPlayWhenReady,
-                // player.getPlaybackState, player.getPlaybackSuppressionReason and
-                // player.getPlaybackError for details.
                 when (player.playbackState) {
-                    // player is able to immediately play from its current position
+                    Player.STATE_ENDED, Player.STATE_IDLE -> {
+                        stopSelf()
+                    }
                     Player.STATE_READY -> {
+                        // Playback is paused. For radio, we can stop the service to remove the notification.
                         stopSelf()
                     }
-                    // buffering - data needs to be loaded
                     Player.STATE_BUFFERING -> {
-                        stopSelf()
+                        // DO NOT stop the service while buffering (especially important for Cast)
-                    }
-                    // player finished playing all media
-                    Player.STATE_ENDED -> {
-                        stopSelf()
-                    }
-                    // initial state or player is stopped or playback failed
-                    Player.STATE_IDLE -> {
-                        stopSelf()
                     }
                 }
             }
@@ -463,13 +565,9 @@ class PlayerService : MediaLibraryService() {
         override fun onPlayWhenReadyChanged(playWhenReady: Boolean, reason: Int) {
             super.onPlayWhenReadyChanged(playWhenReady, reason)
             if (!playWhenReady) {
-                when (reason) {
+                // Only stop if not buffering and not ready to play (i.e. truly stopped/paused)
-                    Player.PLAY_WHEN_READY_CHANGE_REASON_END_OF_MEDIA_ITEM -> {
+                if (player.playbackState != Player.STATE_BUFFERING) {
-                        stopSelf()
+                    stopSelf()
-                    }
-                    else -> {
-                        stopSelf()
-                    }
                 }
             }
         }
@@ -494,7 +592,7 @@ class PlayerService : MediaLibraryService() {
 
 
     /*
-     * Custom LoadErrorHandlingPolicy that network drop outs
+     * Custom LoadErrorHandlingPolicy that network drop-outs
      */
     private val loadErrorHandlingPolicy: DefaultLoadErrorHandlingPolicy = object: DefaultLoadErrorHandlingPolicy()  {
         override fun getRetryDelayMsFor(loadErrorInfo: LoadErrorHandlingPolicy.LoadErrorInfo): Long {

app/src/main/java/com/michatec/radio/SettingsFragment.kt

@@ -6,7 +6,6 @@ import android.content.ClipboardManager
 import android.content.Context
 import android.content.Intent
 import android.net.Uri
-import android.os.Build
 import android.os.Bundle
 import android.util.Log
 import android.view.View
@@ -18,6 +17,7 @@ import androidx.navigation.fragment.findNavController
 import androidx.preference.*
 import com.google.android.material.snackbar.Snackbar
 import com.michatec.radio.dialogs.ErrorDialog
+import com.michatec.radio.dialogs.PresetSelectionDialog
 import com.michatec.radio.dialogs.ThemeSelectionDialog
 import com.michatec.radio.dialogs.YesNoDialog
 import com.michatec.radio.helpers.*
@@ -31,7 +31,7 @@ import java.util.*
 /*
  * SettingsFragment class
  */
-class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogListener, ThemeSelectionDialog.ThemeSelectionDialogListener {
+class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogListener, ThemeSelectionDialog.ThemeSelectionDialogListener, PresetSelectionDialog.PresetSelectionDialogListener {
 
 
     /* Define log tag */
@@ -53,6 +53,9 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
         val context = preferenceManager.context
         val screen = preferenceManager.createPreferenceScreen(context)
 
+        // Load current preset once
+        val currentPreset = PreferencesHelper.loadSelectedPreset()
+
         // set up "App Theme" preference
         val preferenceThemeSelection = Preference(activity as Context)
         preferenceThemeSelection.title = getString(R.string.pref_theme_selection_title)
@@ -186,6 +189,76 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
             return@setOnPreferenceChangeListener true
         }
 
+        // set up "Bass Boost" preference
+        val preferenceBassBoost = MarqueeSwitchPreference(context)
+        preferenceBassBoost.title = getString(R.string.pref_bass_boost_title)
+        preferenceBassBoost.setIcon(R.drawable.ic_music_note_24dp)
+        preferenceBassBoost.key = Keys.PREF_BASS_BOOST
+        preferenceBassBoost.isEnabled = currentPreset.isEmpty()
+        preferenceBassBoost.summary = getString(R.string.pref_bass_boost_summary)
+        preferenceBassBoost.setDefaultValue(false)
+
+        // set up "Reverb" preference
+        val preferenceReverb = MarqueeSwitchPreference(context)
+        preferenceReverb.title = getString(R.string.pref_reverb_title)
+        preferenceReverb.setIcon(R.drawable.ic_music_note_24dp)
+        preferenceReverb.key = Keys.PREF_REVERB
+        preferenceReverb.isEnabled = currentPreset.isEmpty()
+        preferenceReverb.summary = getString(R.string.pref_reverb_summary)
+        preferenceReverb.setDefaultValue(false)
+
+        // set up "DRC" preference
+        val preferenceDrc = MarqueeSwitchPreference(context)
+        preferenceDrc.title = getString(R.string.pref_drc_title)
+        preferenceDrc.setIcon(R.drawable.ic_music_note_24dp)
+        preferenceDrc.key = Keys.PREF_DRC
+        preferenceDrc.isEnabled = currentPreset.isEmpty()
+        preferenceDrc.summary = getString(R.string.pref_drc_summary)
+        preferenceDrc.setDefaultValue(true)
+
+        // set up "Preset Selection" preference
+        val preferencePresetSelection = Preference(context)
+        preferencePresetSelection.title = getString(R.string.pref_preset_selection_title)
+        preferencePresetSelection.setIcon(R.drawable.ic_music_note_24dp)
+        preferencePresetSelection.key = Keys.PREF_PRESET_SELECTED
+        val presetSummary = currentPreset.ifEmpty {
+            getString(R.string.pref_preset_none)
+        }
+        preferencePresetSelection.summary = "${getString(R.string.pref_preset_selection_summary)}: $presetSummary"
+        preferencePresetSelection.setOnPreferenceClickListener {
+            PresetSelectionDialog(this).show(activity as Context)
+            return@setOnPreferenceClickListener true
+        }
+
+        // Initialize EQ control states based on current preset
+        updateEqControlStates()
+
+        // set up "Equalizer" preference entry
+        val preferenceEqualizer = Preference(context)
+        preferenceEqualizer.title = getString(R.string.pref_equalizer_title)
+        preferenceEqualizer.setIcon(R.drawable.ic_music_note_24dp)
+        preferenceEqualizer.key = Keys.PREF_EQUALIZER
+        if (currentPreset.isEmpty()) {
+            preferenceEqualizer.summary = getString(R.string.pref_equalizer_summary)
+            preferenceEqualizer.isEnabled = true
+        } else {
+            preferenceEqualizer.summary = getString(R.string.pref_equalizer_summary_off)
+            preferenceEqualizer.isEnabled = false
+        }
+        preferenceEqualizer.setOnPreferenceClickListener {
+            findNavController().navigate(R.id.action_settings_to_equalizer)
+            return@setOnPreferenceClickListener true
+        }
+
+        val preferenceVisualizer = Preference(context)
+        preferenceVisualizer.title = getString(R.string.pref_visualizer_title)
+        preferenceVisualizer.setIcon(R.drawable.ic_music_note_24dp)
+        preferenceVisualizer.summary = getString(R.string.pref_visualizer_summary)
+        preferenceVisualizer.setOnPreferenceClickListener {
+            findNavController().navigate(R.id.action_settings_to_visualizer)
+            return@setOnPreferenceClickListener true
+        }
+
         // set up "App Version" preference
         val preferenceAppVersion = Preference(context)
         preferenceAppVersion.title = getString(R.string.pref_app_version_title)
@@ -196,10 +269,7 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
             val clip: ClipData = ClipData.newPlainText("simple text", preferenceAppVersion.summary)
             val cm: ClipboardManager = context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
             cm.setPrimaryClip(clip)
-            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU) {
+            Snackbar.make(requireView(), R.string.toastmessage_copied_to_clipboard, Snackbar.LENGTH_LONG).show()
-                // since API 33 (TIRAMISU) the OS displays its own notification when content is copied to the clipboard
-                Snackbar.make(requireView(), R.string.toastmessage_copied_to_clipboard, Snackbar.LENGTH_LONG).show()
-            }
             return@setOnPreferenceClickListener true
         }
 
@@ -238,51 +308,56 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
         // set preference categories
         val preferenceCategoryGeneral = PreferenceCategory(activity as Context)
         preferenceCategoryGeneral.title = getString(R.string.pref_general_title)
-        preferenceCategoryGeneral.contains(preferenceThemeSelection)
+
+        val preferenceCategoryAudioEffects = PreferenceCategory(context)
+        preferenceCategoryAudioEffects.title = getString(R.string.pref_audio_effects_title)
 
         val preferenceCategoryMaintenance = PreferenceCategory(activity as Context)
         preferenceCategoryMaintenance.title = getString(R.string.pref_maintenance_title)
-        preferenceCategoryMaintenance.contains(preferenceUpdateStationImages)
-        preferenceCategoryMaintenance.contains(preferenceUpdateCollection)
 
         val preferenceCategoryImportExport = PreferenceCategory(activity as Context)
         preferenceCategoryImportExport.title = getString(R.string.pref_backup_import_export_title)
-        preferenceCategoryImportExport.contains(preferenceM3uExport)
-        preferenceCategoryImportExport.contains(preferencePlsExport)
-        preferenceCategoryImportExport.contains(preferenceBackupCollection)
-        preferenceCategoryImportExport.contains(preferenceRestoreCollection)
 
         val preferenceCategoryAdvanced = PreferenceCategory(activity as Context)
         preferenceCategoryAdvanced.title = getString(R.string.pref_advanced_title)
-        preferenceCategoryAdvanced.contains(preferenceBufferSize)
-        preferenceCategoryAdvanced.contains(preferenceEnableEditingGeneral)
-        preferenceCategoryAdvanced.contains(preferenceEnableEditingStreamUri)
 
         val preferenceCategoryLinks = PreferenceCategory(context)
         preferenceCategoryLinks.title = getString(R.string.pref_links_title)
-        preferenceCategoryLinks.contains(preferenceAppVersion)
-        preferenceCategoryLinks.contains(preferenceGitHub)
 
 
         // setup preference screen
         screen.addPreference(preferenceAppVersion)
-        screen.addPreference(preferenceLicense)
+
         screen.addPreference(preferenceCategoryGeneral)
-        screen.addPreference(preferenceThemeSelection)
+        preferenceCategoryGeneral.addPreference(preferenceThemeSelection)
+
+        screen.addPreference(preferenceCategoryAudioEffects)
+        preferenceCategoryAudioEffects.addPreference(preferenceBassBoost)
+        preferenceCategoryAudioEffects.addPreference(preferenceReverb)
+        preferenceCategoryAudioEffects.addPreference(preferenceDrc)
+        preferenceCategoryAudioEffects.addPreference(preferencePresetSelection)
+        preferenceCategoryAudioEffects.addPreference(preferenceEqualizer)
+        preferenceCategoryAudioEffects.addPreference(preferenceVisualizer)
+
         screen.addPreference(preferenceCategoryMaintenance)
-        screen.addPreference(preferenceUpdateStationImages)
+        preferenceCategoryMaintenance.addPreference(preferenceUpdateStationImages)
-        screen.addPreference(preferenceUpdateCollection)
+        preferenceCategoryMaintenance.addPreference(preferenceUpdateCollection)
+
         screen.addPreference(preferenceCategoryImportExport)
-        screen.addPreference(preferenceM3uExport)
+        preferenceCategoryImportExport.addPreference(preferenceM3uExport)
-        screen.addPreference(preferencePlsExport)
+        preferenceCategoryImportExport.addPreference(preferencePlsExport)
-        screen.addPreference(preferenceBackupCollection)
+        preferenceCategoryImportExport.addPreference(preferenceBackupCollection)
-        screen.addPreference(preferenceRestoreCollection)
+        preferenceCategoryImportExport.addPreference(preferenceRestoreCollection)
+
         screen.addPreference(preferenceCategoryAdvanced)
-        screen.addPreference(preferenceBufferSize)
+        preferenceCategoryAdvanced.addPreference(preferenceBufferSize)
-        screen.addPreference(preferenceEnableEditingGeneral)
+        preferenceCategoryAdvanced.addPreference(preferenceEnableEditingGeneral)
-        screen.addPreference(preferenceEnableEditingStreamUri)
+        preferenceCategoryAdvanced.addPreference(preferenceEnableEditingStreamUri)
+
         screen.addPreference(preferenceCategoryLinks)
-        screen.addPreference(preferenceGitHub)
+        preferenceCategoryLinks.addPreference(preferenceGitHub)
+        preferenceCategoryLinks.addPreference(preferenceLicense)
+
         preferenceScreen = screen
     }
 
@@ -307,6 +382,49 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
     }
 
 
+    /* Overrides onPresetSelectionDialog from PresetSelectionDialogListener */
+    override fun onPresetSelectionDialog(dialogResult: Boolean, selectedPreset: String) {
+        if (dialogResult) {
+            // update summary
+            val presetPreference = findPreference<Preference>(Keys.PREF_PRESET_SELECTED)
+            val presetSummary = selectedPreset.ifEmpty {
+                getString(R.string.pref_preset_none)
+            }
+            presetPreference?.summary = "${getString(R.string.pref_preset_selection_summary)}: $presetSummary"
+
+            // Enable/disable manual EQ controls based on preset selection
+            updateEqControlStates()
+        }
+    }
+
+    /* Updates the enabled/disabled state of EQ controls based on preset selection */
+    private fun updateEqControlStates() {
+        val currentPreset = PreferencesHelper.loadSelectedPreset()
+        val isPresetSelected = currentPreset.isNotEmpty()
+
+        // Update Bass Boost
+        findPreference<Preference>(Keys.PREF_BASS_BOOST)?.isEnabled = !isPresetSelected
+
+        // Update Reverb
+        findPreference<Preference>(Keys.PREF_REVERB)?.isEnabled = !isPresetSelected
+
+        // Update DRC
+        findPreference<Preference>(Keys.PREF_DRC)?.isEnabled = !isPresetSelected
+
+        // Update Equalizer with proper key
+        val preferenceEqualizer = findPreference<Preference>(Keys.PREF_EQUALIZER)
+        if (preferenceEqualizer != null) {
+            if (isPresetSelected) {
+                preferenceEqualizer.summary = getString(R.string.pref_equalizer_summary_off)
+                preferenceEqualizer.isEnabled = false
+            } else {
+                preferenceEqualizer.summary = getString(R.string.pref_equalizer_summary)
+                preferenceEqualizer.isEnabled = true
+            }
+        }
+    }
+
+
     /* Overrides onYesNoDialog from YesNoDialogListener */
     override fun onYesNoDialog(
         type: Int,
@@ -491,28 +609,6 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
     }
 
 
-    /* Opens up a file picker to select the save location */
-    private fun openSavePlsDialog() {
-        val intent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
-            addCategory(Intent.CATEGORY_OPENABLE)
-            type = Keys.MIME_TYPE_PLS
-
-            val timeStamp: String
-            val dateFormat = SimpleDateFormat("_yyyy-MM-dd'T'HH_mm", Locale.US)
-            timeStamp = dateFormat.format(Date())
-
-            putExtra(Intent.EXTRA_TITLE, "collection$timeStamp.pls")
-        }
-        // file gets saved in the ActivityResult
-        try {
-            requestSavePlsLauncher.launch(intent)
-        } catch (exception: Exception) {
-            Log.e(TAG, "Unable to save PLS.\n$exception")
-            Snackbar.make(requireView(), R.string.toastmessage_install_file_helper, Snackbar.LENGTH_LONG).show()
-        }
-    }
-
-
     /* Opens up a file picker to select the backup location */
     private fun openBackupCollectionDialog() {
         val intent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
@@ -549,4 +645,24 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
             Log.e(TAG, "Unable to open file picker for ZIP.\n$exception")
         }
     }
+
+    private fun openSavePlsDialog() {
+        val intent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
+            addCategory(Intent.CATEGORY_OPENABLE)
+            type = Keys.MIME_TYPE_PLS
+
+            val timeStamp: String
+            val dateFormat = SimpleDateFormat("_yyyy-MM-dd'T'HH_mm", Locale.US)
+            timeStamp = dateFormat.format(Date())
+
+            putExtra(Intent.EXTRA_TITLE, "collection$timeStamp.pls")
+        }
+        // file gets saved in the ActivityResult
+        try {
+            requestSavePlsLauncher.launch(intent)
+        } catch (exception: Exception) {
+            Log.e(TAG, "Unable to save PLS.\n$exception")
+            Snackbar.make(requireView(), R.string.toastmessage_install_file_helper, Snackbar.LENGTH_LONG).show()
+        }
+    }
 }

app/src/main/java/com/michatec/radio/VisualizerFragment.kt

@@ -0,0 +1,122 @@
+package com.michatec.radio
+
+import android.content.ComponentName
+import android.os.Bundle
+import android.os.Handler
+import android.os.Looper
+import android.util.Log
+import android.view.View
+import androidx.annotation.OptIn
+import androidx.appcompat.app.AppCompatActivity
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.session.MediaController
+import androidx.media3.session.SessionToken
+import androidx.preference.PreferenceFragmentCompat
+import com.google.common.util.concurrent.ListenableFuture
+import com.google.common.util.concurrent.MoreExecutors
+import com.michatec.radio.extensions.requestVisualizerData
+import com.michatec.radio.helpers.ExtrasHelper
+
+/*
+ * VisualizerFragment class: Handles audio visualization
+ */
+@OptIn(UnstableApi::class)
+class VisualizerFragment : PreferenceFragmentCompat() {
+
+    private val TAG = "VisualizerFragment"
+    private lateinit var controllerFuture: ListenableFuture<MediaController>
+    private val controller: MediaController?
+        get() = if (this::controllerFuture.isInitialized && controllerFuture.isDone) {
+            try { controllerFuture.get() } catch (_: Exception) { null }
+        } else null
+
+    private var visualizerPref: ExtrasHelper.VisualizerPreference? = null
+    private val handler = Handler(Looper.getMainLooper())
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        (activity as AppCompatActivity).supportActionBar?.title = getString(R.string.pref_visualizer_title)
+        (activity as AppCompatActivity).supportActionBar?.show()
+    }
+
+    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
+        val context = preferenceManager.context
+        val screen = preferenceManager.createPreferenceScreen(context)
+        
+        visualizerPref = ExtrasHelper.VisualizerPreference(context)
+        visualizerPref?.key = "visualizer_key"
+        screen.addPreference(visualizerPref!!)
+
+        preferenceScreen = screen
+    }
+
+    override fun onStart() {
+        super.onStart()
+        initializeController()
+    }
+
+    override fun onStop() {
+        super.onStop()
+        releaseController()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        startPolling()
+    }
+
+    override fun onPause() {
+        super.onPause()
+        stopPolling()
+    }
+
+    private fun initializeController() {
+        controllerFuture = MediaController.Builder(
+            requireContext(),
+            SessionToken(requireContext(), ComponentName(requireContext(), PlayerService::class.java))
+        ).buildAsync()
+        controllerFuture.addListener({
+            Log.d(TAG, "MediaController connected: ${controller != null}")
+        }, MoreExecutors.directExecutor())
+    }
+
+    private fun releaseController() {
+        if (this::controllerFuture.isInitialized) {
+            MediaController.releaseFuture(controllerFuture)
+        }
+    }
+
+    private val pollRunnable = object : Runnable {
+        override fun run() {
+            val c = controller
+            if (c != null && c.isPlaying) {
+                val resultFuture = c.requestVisualizerData()
+                resultFuture.addListener({
+                    try {
+                        val result = resultFuture.get()
+                        if (result.resultCode == androidx.media3.session.SessionResult.RESULT_SUCCESS) {
+                            val data = result.extras.getFloatArray(Keys.EXTRA_VISUALIZER_DATA)
+                            if (data != null && data.isNotEmpty()) {
+                                visualizerPref?.update(data)
+                            }
+                        } else {
+                            Log.e(TAG, "Custom command failed with result code: ${result.resultCode}")
+                        }
+                    } catch (e: Exception) {
+                        Log.e(TAG, "Error fetching visualizer data", e)
+                    }
+                }, MoreExecutors.directExecutor())
+            }
+            handler.postDelayed(this, 18) // ~60 FPS
+        }
+    }
+
+    private fun startPolling() {
+        handler.removeCallbacks(pollRunnable)
+        handler.post(pollRunnable)
+    }
+
+    private fun stopPolling() {
+        handler.removeCallbacks(pollRunnable)
+    }
+}

app/src/main/java/com/michatec/radio/dialogs/PresetSelectionDialog.kt

@@ -0,0 +1,86 @@
+package com.michatec.radio.dialogs
+
+import android.content.Context
+import android.view.LayoutInflater
+import android.widget.RadioButton
+import androidx.appcompat.app.AlertDialog
+import androidx.core.content.ContextCompat.getString
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import com.michatec.radio.R
+import com.michatec.radio.helpers.PreferencesHelper
+
+
+/*
+ * PresetSelectionDialog class
+ */
+class PresetSelectionDialog(private var presetSelectionDialogListener: PresetSelectionDialogListener) {
+
+    /* Interface used to communicate back to activity */
+    interface PresetSelectionDialogListener {
+        fun onPresetSelectionDialog(dialogResult: Boolean, selectedPreset: String)
+    }
+
+
+    /* Main class variables */
+    private lateinit var dialog: AlertDialog
+
+
+    /* Construct and show dialog */
+    fun show(context: Context) {
+        // prepare dialog builder
+        val builder = MaterialAlertDialogBuilder(context)
+
+        // inflate custom layout
+        val inflater = LayoutInflater.from(context)
+        val view = inflater.inflate(R.layout.dialog_preset_selection, null)
+
+        // find radio buttons
+        val radioGroup = view.findViewById<android.widget.RadioGroup>(R.id.preset_radio_group)
+        val radioNone = view.findViewById<RadioButton>(R.id.radio_preset_none)
+        val radioRock = view.findViewById<RadioButton>(R.id.radio_preset_rock)
+        val radioPop = view.findViewById<RadioButton>(R.id.radio_preset_pop)
+        val radioJazz = view.findViewById<RadioButton>(R.id.radio_preset_jazz)
+        val radioFlat = view.findViewById<RadioButton>(R.id.radio_preset_flat)
+
+        // set current selection
+        val currentPreset = PreferencesHelper.loadSelectedPreset()
+        when (currentPreset) {
+            "" -> radioNone.isChecked = true
+            getString(context, R.string.pref_preset_rock) -> radioRock.isChecked = true
+            getString(context, R.string.pref_preset_pop) -> radioPop.isChecked = true
+            getString(context, R.string.pref_preset_jazz) -> radioJazz.isChecked = true
+            getString(context, R.string.pref_preset_flat) -> radioFlat.isChecked = true
+            else -> radioNone.isChecked = true
+        }
+
+        // set up radio group listener
+        radioGroup.setOnCheckedChangeListener { _, checkedId ->
+            val selectedPreset = when (checkedId) {
+                R.id.radio_preset_none -> ""
+                R.id.radio_preset_rock -> getString(context, R.string.pref_preset_rock)
+                R.id.radio_preset_pop -> getString(context, R.string.pref_preset_pop)
+                R.id.radio_preset_jazz -> getString(context, R.string.pref_preset_jazz)
+                R.id.radio_preset_flat -> getString(context, R.string.pref_preset_flat)
+                else -> ""
+            }
+            // save preset selection to preferences
+            PreferencesHelper.saveSelectedPreset(selectedPreset)
+            // notify listener
+            presetSelectionDialogListener.onPresetSelectionDialog(true, selectedPreset)
+            // dismiss dialog
+            dialog.dismiss()
+        }
+
+        // set custom view
+        builder.setView(view)
+
+        // handle outside-click as cancel
+        builder.setOnCancelListener {
+            presetSelectionDialogListener.onPresetSelectionDialog(false, "")
+        }
+
+        // display dialog
+        dialog = builder.create()
+        dialog.show()
+    }
+}

app/src/main/java/com/michatec/radio/extensions/MediaControllerExt.kt

@@ -35,7 +35,7 @@ fun MediaController.requestSleepTimerRemaining(): ListenableFuture<SessionResult
 }
 
 
-/* Request sleep timer remaining */
+/* Request metadata history */
 fun MediaController.requestMetadataHistory(): ListenableFuture<SessionResult> {
     return sendCustomCommand(
         SessionCommand(Keys.CMD_REQUEST_METADATA_HISTORY, Bundle.EMPTY),
@@ -43,6 +43,14 @@ fun MediaController.requestMetadataHistory(): ListenableFuture<SessionResult> {
     )
 }
 
+/* Request visualizer data */
+fun MediaController.requestVisualizerData(): ListenableFuture<SessionResult> {
+    return sendCustomCommand(
+        SessionCommand(Keys.CMD_GET_VISUALIZER_DATA, Bundle.EMPTY),
+        Bundle.EMPTY
+    )
+}
+
 
 /* Starts playback with a new media item */
 fun MediaController.play(context: Context, station: Station) {

app/src/main/java/com/michatec/radio/helpers/CollectionHelper.kt

@@ -638,18 +638,23 @@ object CollectionHelper {
         }.build()
         // build MediaMetadata
         val mediaMetadata = MediaMetadata.Builder().apply {
+            setTitle(station.name)
             setArtist(station.name)
-            //setTitle(station.name)
+            
+            // Set artwork URI for casting (remote devices need a public URL)
+            if (station.remoteImageLocation.isNotEmpty()) {
+                setArtworkUri(station.remoteImageLocation.toUri())
+            }
+
             /* check for "file://" prevents a crash when an old backup was restored */
             if (station.image.isNotEmpty() && station.image.startsWith("file://")) {
-                //setArtworkUri(station.image.toUri())
                 setArtworkData(station.image.toUri().toFile().readBytes(), MediaMetadata.PICTURE_TYPE_FRONT_COVER)
             } else {
-                //setArtworkUri(Uri.parse(Keys.LOCATION_RESOURCES + R.raw.ic_default_station_image))
                 setArtworkData(ImageHelper.getStationImageAsByteArray(context), MediaMetadata.PICTURE_TYPE_FRONT_COVER)
             }
             setIsBrowsable(false)
             setIsPlayable(true)
+            setMediaType(MediaMetadata.MEDIA_TYPE_RADIO_STATION)
         }.build()
         // build MediaItem and return it
         return MediaItem.Builder().apply {

app/src/main/java/com/michatec/radio/helpers/ExtrasHelper.kt

@@ -0,0 +1,117 @@
+package com.michatec.radio.helpers
+
+import android.content.Context
+import android.util.AttributeSet
+import android.util.Log
+import android.view.Surface
+import android.view.SurfaceHolder
+import android.view.SurfaceView
+import android.view.ViewGroup
+import android.widget.FrameLayout
+import androidx.preference.Preference
+import androidx.preference.PreferenceViewHolder
+import com.michatec.radio.R
+
+class ExtrasHelper {
+    companion object {
+        private const val TAG = "ExtrasHelper"
+        init {
+            try {
+                System.loadLibrary("extra")
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to load extra library", e)
+            }
+        }
+
+        @JvmStatic
+        private external fun visualize(surface: Surface, data: FloatArray)
+
+        fun render(surface: Surface, data: FloatArray) {
+            if (!surface.isValid) return
+            try {
+                visualize(surface, data)
+            } catch (e: Exception) {
+                Log.e(TAG, "Native visualize failed", e)
+            }
+        }
+    }
+
+    class VisualizerPreference(context: Context, attrs: AttributeSet? = null) : Preference(context, attrs) {
+        private var visualizerView: VisualizerView? = null
+
+        init {
+            // We can use a standard layout and inject our view
+            layoutResource = R.layout.preference_visualizer
+        }
+
+        override fun onBindViewHolder(holder: PreferenceViewHolder) {
+            super.onBindViewHolder(holder)
+            
+            // Try to find the container in the inflated layout
+            var container = holder.findViewById(R.id.visualizer_container) as? ViewGroup
+
+            // Fallback: If not found by ID, maybe the root is the container?
+            if (container == null && holder.itemView is ViewGroup) {
+                container = holder.itemView as ViewGroup
+            }
+
+            if (container != null) {
+                if (visualizerView == null) {
+                    visualizerView = VisualizerView(context).apply {
+                        layoutParams = ViewGroup.LayoutParams(
+                            ViewGroup.LayoutParams.MATCH_PARENT,
+                            ViewGroup.LayoutParams.MATCH_PARENT
+                        )
+                    }
+                }
+
+                val currentParent = visualizerView?.parent as? ViewGroup
+                if (currentParent != container) {
+                    currentParent?.removeView(visualizerView)
+                    // If we injected into a standard preference, don't clear everything, just add
+                    if (container is FrameLayout || container.childCount == 0) {
+                        container.removeAllViews()
+                    }
+                    container.addView(visualizerView)
+                }
+            } else {
+                Log.e("VisualizerPreference", "Could not find any container to attach VisualizerView!")
+            }
+        }
+
+        fun update(data: FloatArray) {
+            visualizerView?.update(data)
+        }
+    }
+
+    class VisualizerView @JvmOverloads constructor(
+        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+    ) : SurfaceView(context, attrs, defStyleAttr), SurfaceHolder.Callback {
+
+        private var surface: Surface? = null
+
+        init {
+            Log.d("VisualizerView", "VisualizerView initialized")
+            holder.addCallback(this)
+        }
+
+        fun update(data: FloatArray) {
+            val s = surface
+            if (s != null && s.isValid) {
+                render(s, data)
+            }
+        }
+
+        override fun surfaceCreated(holder: SurfaceHolder) {
+            surface = holder.surface
+        }
+
+        override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {
+            surface = holder.surface
+        }
+
+        override fun surfaceDestroyed(holder: SurfaceHolder) {
+            surface = null
+        }
+    }
+}

app/src/main/java/com/michatec/radio/helpers/MarqueeSwitchPreference.kt

@@ -0,0 +1,25 @@
+package com.michatec.radio.helpers
+
+import android.content.Context
+import android.text.TextUtils
+import android.widget.TextView
+import androidx.preference.PreferenceViewHolder
+import androidx.preference.SwitchPreferenceCompat
+
+/*
+ * Custom SwitchPreferenceCompat that enables marquee (scrolling text) for the title
+ */
+class MarqueeSwitchPreference(context: Context) : SwitchPreferenceCompat(context) {
+
+    override fun onBindViewHolder(holder: PreferenceViewHolder) {
+        super.onBindViewHolder(holder)
+        val title = holder.findViewById(android.R.id.title) as? TextView
+        title?.apply {
+            ellipsize = TextUtils.TruncateAt.MARQUEE
+            setSingleLine(true)
+            marqueeRepeatLimit = -1 // Repeat indefinitely
+            isSelected = true       // Required for marquee to start
+            setHorizontallyScrolling(true)
+        }
+    }
+}

app/src/main/java/com/michatec/radio/helpers/NativeAudioProcessor.kt

@@ -0,0 +1,129 @@
+package com.michatec.radio.helpers
+
+import android.util.Log
+import androidx.annotation.OptIn
+import androidx.media3.common.C
+import androidx.media3.common.audio.AudioProcessor
+import androidx.media3.common.audio.AudioProcessor.AudioFormat
+import androidx.media3.common.audio.BaseAudioProcessor
+import androidx.media3.common.util.UnstableApi
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+
+@OptIn(UnstableApi::class)
+class NativeAudioProcessor : BaseAudioProcessor() {
+
+    companion object {
+        private const val TAG = "NativeAudioProcessor"
+        init {
+            try {
+                System.loadLibrary("dsp")
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to load dsp library", e)
+            }
+        }
+    }
+
+    private var directBuffer: ByteBuffer? = null
+
+    // ===== JNI =====
+    private external fun setSampleRate(sampleRate: Float)
+    private external fun setDrcEnabled(enabled: Boolean)
+    private external fun setReverbMix(mix: Float)
+    private external fun setEqFull(gains: FloatArray)
+    private external fun setBassBoost(gainDb: Float)
+    private external fun setStereoWidth(width: Float)
+    private external fun processAudioDirect(buf: ByteBuffer, size: Int)
+    private external fun getFftData(): FloatArray
+
+    // ===== API =====
+    fun enableDrc(enabled: Boolean) = setDrcEnabled(enabled)
+    fun setReverb(mix: Float) = setReverbMix(mix)
+    fun setEqAll(gains: FloatArray) = setEqFull(gains)
+    fun enableBassBoost(gainDb: Float) = setBassBoost(gainDb)
+    fun setWidth(width: Float) = setStereoWidth(width)
+
+    fun getVisualizer(): FloatArray {
+        val raw = getFftData()
+        val out = FloatArray(raw.size)
+        for (i in raw.indices) out[i] = kotlin.math.log10(1f + raw[i])
+        return out
+    }
+
+    // ===== AudioProcessor Overrides =====
+    override fun onConfigure(inputAudioFormat: AudioFormat): AudioFormat {
+        // Always try to support the input format if it is PCM 16-bit
+        if (inputAudioFormat.encoding != C.ENCODING_PCM_16BIT) {
+            Log.e(TAG, "Unsupported encoding: ${inputAudioFormat.encoding}")
+            throw AudioProcessor.UnhandledAudioFormatException(inputAudioFormat)
+        }
+        // Pass the actual sample rate to native
+        setSampleRate(inputAudioFormat.sampleRate.toFloat())
+        return inputAudioFormat
+    }
+
+    override fun queueInput(inputBuffer: ByteBuffer) {
+        val size = inputBuffer.remaining()
+        if (size == 0) return
+
+        val bufferToProcess: ByteBuffer
+        if (inputBuffer.isDirect) {
+            bufferToProcess = inputBuffer
+        } else {
+            if (directBuffer == null || directBuffer!!.capacity() < size) {
+                directBuffer = ByteBuffer.allocateDirect(size).order(ByteOrder.nativeOrder())
+            }
+            directBuffer!!.clear()
+            inputBuffer.position()
+            directBuffer!!.put(inputBuffer)
+            directBuffer!!.flip()
+            bufferToProcess = directBuffer!!
+        }
+
+        processAudioDirect(bufferToProcess, size)
+
+        val out = replaceOutputBuffer(size)
+        out.order(ByteOrder.nativeOrder())
+        bufferToProcess.position(0)
+        out.put(bufferToProcess)
+        out.flip()
+    }
+
+    override fun onReset() {
+        super.onReset()
+        directBuffer = null
+    }
+
+    // ===== Presets =====
+    fun setPresetRock() {
+        enableDrc(true)
+        setReverb(0.10f)
+        setWidth(1.1f)
+        setEqAll(floatArrayOf(2f, 1f, 0f, -1f, -1f, 0f, 1f, 2f, 2f, 3f))
+        enableBassBoost(0.9f)
+    }
+
+    fun setPresetPop() {
+        enableDrc(true)
+        setReverb(0.10f)
+        setWidth(1.05f)
+        setEqAll(floatArrayOf(0f, 1f, 1f, 1f, 0f, 0f, 1f, 2f, 2f, 1f))
+        enableBassBoost(0.6f)
+    }
+
+    fun setPresetJazz() {
+        enableDrc(false)
+        setReverb(0.15f)
+        setWidth(0.8f)
+        setEqAll(floatArrayOf(0f, 0f, 1f, 1f, 0f, 0f, 1f, 1f, 0f, 0f))
+        enableBassBoost(0.2f)
+    }
+
+    fun setPresetFlat() {
+        enableDrc(false)
+        setReverb(0f)
+        setWidth(1f)
+        setEqAll(FloatArray(10))
+        enableBassBoost(0f)
+    }
+}

app/src/main/java/com/michatec/radio/helpers/PreferencesHelper.kt

@@ -254,4 +254,95 @@ object PreferencesHelper {
         )
     }
 
+
+    /* Loads Bass Boost gain */
+    fun loadBassBoost(): Float {
+        return if (sharedPreferences.getBoolean(Keys.PREF_BASS_BOOST, false)) 1f else 0.0f
+    }
+
+
+    /* Loads Reverb mix */
+    fun loadReverb(): Float {
+        return if (sharedPreferences.getBoolean(Keys.PREF_REVERB, false)) 0.18f else 0.0f
+    }
+
+
+    /* Loads DRC enabled state */
+    fun loadDrcEnabled(): Boolean {
+        return sharedPreferences.getBoolean(Keys.PREF_DRC, false)
+    }
+
+    /* Loads all EQ bands (10 bands for full range) */
+    fun loadEqBand(band: Int): Int {
+        return when (band) {
+            0 -> sharedPreferences.getInt(Keys.PREF_EQ_LOW, 0)
+            1 -> sharedPreferences.getInt(Keys.PREF_EQ_BAND_1, 0)
+            2 -> sharedPreferences.getInt(Keys.PREF_EQ_MID, 0)
+            3 -> sharedPreferences.getInt(Keys.PREF_EQ_BAND_3, 0)
+            4 -> sharedPreferences.getInt(Keys.PREF_EQ_BAND_4, 0)
+            5 -> sharedPreferences.getInt(Keys.PREF_EQ_BAND_5, 0)
+            6 -> sharedPreferences.getInt(Keys.PREF_EQ_BAND_6, 0)
+            7 -> sharedPreferences.getInt(Keys.PREF_EQ_BAND_7, 0)
+            8 -> sharedPreferences.getInt(Keys.PREF_EQ_BAND_8, 0)
+            9 -> sharedPreferences.getInt(Keys.PREF_EQ_HIGH, 0)
+            else -> 0
+        }
+    }
+
+    /* Loads selected preset name */
+    fun loadSelectedPreset(): String {
+        return sharedPreferences.getString(Keys.PREF_PRESET_SELECTED, "") ?: ""
+    }
+
+    /* Saves selected preset name */
+    fun saveSelectedPreset(preset: String) {
+        sharedPreferences.edit { putString(Keys.PREF_PRESET_SELECTED, preset) }
+    }
+
+    /* Loads preset EQ band values */
+    fun loadPresetEqBand(band: Int): Int {
+        return when (band) {
+            0 -> sharedPreferences.getInt(Keys.PREF_PRESET_EQ_BAND_0, 0)
+            1 -> sharedPreferences.getInt(Keys.PREF_PRESET_EQ_BAND_1, 0)
+            2 -> sharedPreferences.getInt(Keys.PREF_PRESET_EQ_BAND_2, 0)
+            3 -> sharedPreferences.getInt(Keys.PREF_PRESET_EQ_BAND_3, 0)
+            4 -> sharedPreferences.getInt(Keys.PREF_PRESET_EQ_BAND_4, 0)
+            5 -> sharedPreferences.getInt(Keys.PREF_PRESET_EQ_BAND_5, 0)
+            6 -> sharedPreferences.getInt(Keys.PREF_PRESET_EQ_BAND_6, 0)
+            7 -> sharedPreferences.getInt(Keys.PREF_PRESET_EQ_BAND_7, 0)
+            8 -> sharedPreferences.getInt(Keys.PREF_PRESET_EQ_BAND_8, 0)
+            9 -> sharedPreferences.getInt(Keys.PREF_PRESET_EQ_BAND_9, 0)
+            else -> 0
+        }
+    }
+
+    /* Loads preset Bass Boost */
+    fun loadPresetBassBoost(): Float {
+        return sharedPreferences.getFloat(Keys.PREF_PRESET_BASS_BOOST, 0f)
+    }
+
+    /* Loads preset Reverb */
+    fun loadPresetReverb(): Float {
+        return sharedPreferences.getFloat(Keys.PREF_PRESET_REVERB, 0f)
+    }
+
+    /* Loads preset DRC */
+    fun loadPresetDrc(): Boolean {
+        return sharedPreferences.getBoolean(Keys.PREF_PRESET_DRC, false)
+    }
+
+    /* Loads preset Stereo Width */
+    fun loadPresetStereoWidth(): Float {
+        return sharedPreferences.getFloat(Keys.PREF_PRESET_STEREO_WIDTH, 1f)
+    }
+
+    /* Resets Equalizer settings to default */
+    fun resetEqualizer() {
+        sharedPreferences.edit {
+            putInt(Keys.PREF_EQ_LOW, 0)
+            putInt(Keys.PREF_EQ_MID, 0)
+            putInt(Keys.PREF_EQ_HIGH, 0)
+        }
+    }
+
 }

app/src/main/java/com/michatec/radio/ui/LayoutHolder.kt

@@ -19,9 +19,11 @@ import androidx.constraintlayout.widget.ConstraintLayout
 import androidx.constraintlayout.widget.Group
 import androidx.core.view.isGone
 import androidx.core.view.isVisible
+import androidx.mediarouter.app.MediaRouteButton
 import androidx.recyclerview.widget.DefaultItemAnimator
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
+import com.google.android.gms.cast.framework.CastButtonFactory
 import com.google.android.material.bottomsheet.BottomSheetBehavior
 import com.google.android.material.snackbar.Snackbar
 import com.michatec.radio.Keys
@@ -60,6 +62,7 @@ data class LayoutHolder(var rootView: View) {
     private var sheetNextMetadataView: ImageButton? = rootView.findViewById(R.id.sheet_next_metadata_button)
     private var sheetPreviousMetadataView: ImageButton? = rootView.findViewById(R.id.sheet_previous_metadata_button)
     private var sheetCopyMetadataButtonView: ImageButton? = rootView.findViewById(R.id.copy_station_metadata_button)
+    private var mediaRouteButton: MediaRouteButton? = rootView.findViewById(R.id.media_route_button)
     private var sheetShareLinkButtonView: ImageView? = rootView.findViewById(R.id.sheet_share_link_button)
     private var sheetBitrateView: TextView? = rootView.findViewById(R.id.sheet_bitrate_view)
     var sheetSleepTimerStartButtonView: ImageButton? = rootView.findViewById(R.id.sleep_timer_start_button)
@@ -115,6 +118,11 @@ data class LayoutHolder(var rootView: View) {
             return@setOnLongClickListener true
         }
 
+        // Set up MediaRouteButton (Google Cast)
+        mediaRouteButton?.let {
+            CastButtonFactory.setUpMediaRouteButton(rootView.context, it)
+        }
+
         // set layout for player
         setupBottomSheet()
     }
@@ -123,8 +131,6 @@ data class LayoutHolder(var rootView: View) {
     /* Updates the player views */
     @SuppressLint("DefaultLocale")
     fun updatePlayerViews(context: Context, station: Station, isPlaying: Boolean) {
-
-        // set default metadata views, when playback has stopped
         if (!isPlaying) {
             metadataView?.text = station.name
             sheetMetadataHistoryView?.text = station.name

app/src/main/res/layout-television/dialog_preset_selection.xml

@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="24dp">
+
+    <TextView
+        android:id="@+id/dialog_title"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/pref_preset_selection_title"
+        android:textSize="24sp"
+        android:textStyle="bold"
+        android:paddingBottom="16dp" />
+
+    <RadioGroup
+        android:id="@+id/preset_radio_group"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical">
+
+        <RadioButton
+            android:id="@+id/radio_preset_none"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pref_preset_none"
+            android:textSize="20sp"
+            android:padding="12dp"
+            android:focusable="true"
+            android:clickable="true" />
+
+        <RadioButton
+            android:id="@+id/radio_preset_rock"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pref_preset_rock"
+            android:textSize="20sp"
+            android:padding="12dp"
+            android:focusable="true"
+            android:clickable="true" />
+
+        <RadioButton
+            android:id="@+id/radio_preset_pop"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pref_preset_pop"
+            android:textSize="20sp"
+            android:padding="12dp"
+            android:focusable="true"
+            android:clickable="true" />
+
+        <RadioButton
+            android:id="@+id/radio_preset_jazz"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pref_preset_jazz"
+            android:textSize="20sp"
+            android:padding="12dp"
+            android:focusable="true"
+            android:clickable="true" />
+
+        <RadioButton
+            android:id="@+id/radio_preset_flat"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pref_preset_flat"
+            android:textSize="20sp"
+            android:padding="12dp"
+            android:focusable="true"
+            android:clickable="true" />
+
+    </RadioGroup>
+
+</LinearLayout>

app/src/main/res/layout-television/preference_visualizer.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <FrameLayout
+        android:id="@+id/visualizer_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="#FF000000"
+        android:focusable="true" />
+
+</LinearLayout>

app/src/main/res/layout/bottom_sheet_playback_controls.xml

@@ -211,6 +211,18 @@
         app:layout_constraintTop_toBottomOf="@+id/sheet_previous_metadata_button"
         app:srcCompat="@drawable/ic_copy_content_24dp" />
 
+    <androidx.mediarouter.app.MediaRouteButton
+        android:id="@+id/media_route_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="8dp"
+        android:background="?attr/selectableItemBackgroundBorderless"
+        android:padding="8dp"
+        app:layout_constraintBottom_toBottomOf="@+id/copy_station_metadata_button"
+        app:layout_constraintStart_toEndOf="@+id/copy_station_metadata_button"
+        app:layout_constraintTop_toTopOf="@+id/copy_station_metadata_button"
+        app:mediaRouteButtonTint="@color/player_sheet_text_main" />
+
     <com.google.android.material.textview.MaterialTextView
         android:id="@+id/sheet_bitrate_view"
         android:layout_width="wrap_content"
@@ -290,4 +302,4 @@
         android:visibility="gone"
         app:constraint_referenced_ids="sleep_timer_remaining_time,sleep_timer_cancel_button" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/dialog_preset_selection.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="16dp">
+
+    <TextView
+        android:id="@+id/dialog_title"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/pref_preset_selection_title"
+        android:textSize="18sp"
+        android:textStyle="bold"
+        android:paddingBottom="12dp" />
+
+    <RadioGroup
+        android:id="@+id/preset_radio_group"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical">
+
+        <RadioButton
+            android:id="@+id/radio_preset_none"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pref_preset_none"
+            android:textSize="16sp"
+            android:padding="8dp"/>
+
+        <RadioButton
+            android:id="@+id/radio_preset_rock"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pref_preset_rock"
+            android:textSize="16sp"
+            android:padding="8dp"/>
+
+        <RadioButton
+            android:id="@+id/radio_preset_pop"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pref_preset_pop"
+            android:textSize="16sp"
+            android:padding="8dp"/>
+
+        <RadioButton
+            android:id="@+id/radio_preset_jazz"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pref_preset_jazz"
+            android:textSize="16sp"
+            android:padding="8dp"/>
+
+        <RadioButton
+            android:id="@+id/radio_preset_flat"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/pref_preset_flat"
+            android:textSize="16sp"
+            android:padding="8dp"/>
+
+    </RadioGroup>
+
+</LinearLayout>

app/src/main/res/layout/preference_visualizer.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <FrameLayout
+        android:id="@+id/visualizer_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="#FF000000" />
+
+</LinearLayout>

app/src/main/res/menu/expanded_controller.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <item
+        android:id="@+id/media_route_menu_item"
+        android:title="@string/media_route_menu_title"
+        app:actionProviderClass="androidx.mediarouter.app.MediaRouteActionProvider"
+        app:showAsAction="always" />
+
+</menu>

app/src/main/res/navigation/nav_graph_main.xml

@@ -19,6 +19,24 @@
     <fragment
         android:id="@+id/settings_destination"
         android:name="com.michatec.radio.SettingsFragment"
-        android:label="Settings" />
+        android:label="Settings">
+        <action
+            android:id="@+id/action_settings_to_equalizer"
+            app:destination="@id/equalizer_destination" />
+        <action
+            android:id="@+id/action_settings_to_visualizer"
+            app:destination="@id/visualizer_destination" />
+    </fragment>
 
-</navigation>
+    <!-- EQUALIZER -->
+    <fragment
+        android:id="@+id/equalizer_destination"
+        android:name="com.michatec.radio.EqualizerFragment"
+        android:label="Equalizer" />
+
+    <!-- VISUALIZER -->
+    <fragment
+        android:id="@+id/visualizer_destination"
+        android:name="com.michatec.radio.VisualizerFragment"
+        android:label="Visualizer" />
+</navigation>

app/src/main/res/values-de/strings.xml

@@ -117,4 +117,34 @@
     <!-- Snackbars -->
     <string name="snackbar_show">Zeigen</string>
     <string name="snackbar_update_available">ist verfügbar!</string>
+    <string name="pref_audio_effects_title">Audio-Effekte</string>
+    <string name="pref_bass_boost_title">Bass-Boost</string>
+    <string name="pref_bass_boost_summary">Erhöhen Sie die Bassverstärkung.</string>
+    <string name="pref_reverb_title">Hall</string>
+    <string name="pref_reverb_summary">Reverb-Mix anpassen.</string>
+    <string name="pref_drc_title">Dynamikkompression</string>
+    <string name="pref_drc_summary">Den Dynamikbereich für eine gleichbleibende Lautstärke komprimieren.</string>
+    <string name="pref_eq_low_title">Equalizer: 31 Hz</string>
+    <string name="pref_eq_mid_title">Equalizer: 2 kHz</string>
+    <string name="pref_eq_high_title">Equalizer: 16 kHz</string>
+    <string name="pref_eq_band_1_title">Equalizer: 62 Hz</string>
+    <string name="pref_eq_band_2_title">Equalizer: 125 Hz</string>
+    <string name="pref_eq_band_3_title">Equalizer: 250 Hz</string>
+    <string name="pref_eq_band_4_title">Equalizer: 500 Hz</string>
+    <string name="pref_eq_band_5_title">Equalizer: 1 kHz</string>
+    <string name="pref_eq_band_6_title">Equalizer: 4 kHz</string>
+    <string name="pref_eq_band_7_title">Equalizer: 8 kHz</string>
+    <string name="pref_equalizer_title">Equalizer</string>
+    <string name="pref_equalizer_summary">Passen Sie die Audio-Frequenzen an.</string>
+    <string name="pref_equalizer_summary_off">Das Anpassen von den Audio-Frequenzen ist deaktiviert.</string>
+    <string name="pref_equalizer_reset_title">Equalizer zurücksetzen</string>
+    <string name="pref_preset_selection_title">Preset auswählen</string>
+    <string name="pref_preset_selection_summary">Wählen Sie ein Klangprofil</string>
+    <string name="pref_preset_none">Keines (Manuell)</string>
+    <string name="pref_preset_rock">Rock</string>
+    <string name="pref_preset_pop">Pop</string>
+    <string name="pref_preset_jazz">Jazz</string>
+    <string name="pref_preset_flat">Flach</string>
+    <string name="pref_visualizer_title">Spektrumanzeige</string>
+    <string name="pref_visualizer_summary">Sehe die Spektrumanzeige.</string>
 </resources>

app/src/main/res/values-night/styles.xml

@@ -27,4 +27,10 @@
         <!-- Don't show light status bar -->
         <item name="android:statusBarColor">@android:color/transparent</item>
     </style>
+
+    <style name="CustomCastExpandedControllerStyle" parent="CastExpandedController">
+        <item name="android:windowBackground">#FFFFFF</item>
+        <item name="castBackground">#FFFFFF</item>
+        <item name="castButtonColor">#FF495D92</item>
+    </style>
 </resources>

app/src/main/res/values/strings.xml

@@ -63,6 +63,34 @@
     <string name="pref_update_collection_summary">Download latest version of all station.</string>
     <string name="dialog_yes_no_message_update_collection">Download latest version of all station?</string>
     <string name="dialog_yes_no_positive_button_update_collection">Update</string>
+    <string name="pref_audio_effects_title">Audio Effects</string>
+    <string name="pref_bass_boost_title">Bass Boost</string>
+    <string name="pref_bass_boost_summary">Increase bass gain.</string>
+    <string name="pref_reverb_title">Reverb</string>
+    <string name="pref_reverb_summary">Adjust reverb mix.</string>
+    <string name="pref_drc_title">Dynamic Range Compression</string>
+    <string name="pref_drc_summary">Compress dynamic range for consistent volume.</string>
+    <string name="pref_eq_low_title">Equalizer: 31 Hz</string>
+    <string name="pref_eq_mid_title">Equalizer: 125 Hz</string>
+    <string name="pref_eq_high_title">Equalizer: 4 kHz</string>
+    <string name="pref_eq_band_1_title">Equalizer: 62 Hz</string>
+    <string name="pref_eq_band_2_title">Equalizer: 250 Hz</string>
+    <string name="pref_eq_band_3_title">Equalizer: 500 Hz</string>
+    <string name="pref_eq_band_4_title">Equalizer: 1 kHz</string>
+    <string name="pref_eq_band_5_title">Equalizer: 2 kHz</string>
+    <string name="pref_eq_band_6_title">Equalizer: 8 kHz</string>
+    <string name="pref_eq_band_7_title">Equalizer: 16 kHz</string>
+    <string name="pref_equalizer_title">Equalizer</string>
+    <string name="pref_equalizer_summary">Adjust audio frequencies</string>
+    <string name="pref_equalizer_summary_off">Adjust audio frequencies is off.</string>
+    <string name="pref_equalizer_reset_title">Reset Equalizer</string>
+    <string name="pref_preset_selection_title">Select Preset</string>
+    <string name="pref_preset_selection_summary">Choose an audio preset</string>
+    <string name="pref_preset_none">None (Manual)</string>
+    <string name="pref_preset_rock">Rock</string>
+    <string name="pref_preset_pop">Pop</string>
+    <string name="pref_preset_jazz">Jazz</string>
+    <string name="pref_preset_flat">Flat</string>
     <string name="pref_advanced_title">Advanced</string>
     <string name="pref_app_version_summary">Version</string>
     <string name="pref_app_version_title">App Version</string>
@@ -144,4 +172,7 @@
 
     <!-- Extras -->
     <string name="loading">Loading...</string>
+    <string name="media_route_menu_title">Cast</string>
+    <string name="pref_visualizer_title">Spectrum Analyzer</string>
+    <string name="pref_visualizer_summary">Show the Spectrum Analyzer.</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -74,4 +74,10 @@
         <item name="cornerSizeBottomRight">16dp</item>
         <item name="cornerFamilyBottomRight">rounded</item>
     </style>
+
+    <style name="CustomCastExpandedControllerStyle" parent="CastExpandedController">
+        <item name="android:windowBackground">#FFFFFF</item>
+        <item name="castBackground">#FFFFFF</item>
+        <item name="castButtonColor">#FF495D92</item>
+    </style>
 </resources>

build.gradle

@@ -7,5 +7,5 @@ plugins {
 }
 
 tasks.register('clean', Delete) {
-    delete rootProject.buildDir()
+    delete layout.buildDirectory
 }

gradle/libs.versions.toml

@@ -15,6 +15,7 @@ paletteKtx = "1.0.0"
 preferenceKtx = "1.2.1"
 volley = "1.2.1"
 workRuntimeKtx = "2.11.2"
+playServicesCastFramework = "22.3.0"
 
 [libraries]
 activity-ktx = { group = "androidx.activity", name = "activity-ktx", version.ref = "activityKtx" }
@@ -29,12 +30,14 @@ media3-datasource-okhttp = { group = "androidx.media3", name = "media3-datasourc
 media3-exoplayer = { group = "androidx.media3", name = "media3-exoplayer", version.ref = "media3" }
 media3-exoplayer-hls = { group = "androidx.media3", name = "media3-exoplayer-hls", version.ref = "media3" }
 media3-session = { group = "androidx.media3", name = "media3-session", version.ref = "media3" }
+media3-cast = { group = "androidx.media3", name = "media3-cast", version.ref = "media3" }
 navigation-fragment-ktx = { group = "androidx.navigation", name = "navigation-fragment-ktx", version.ref = "navigation" }
 navigation-ui-ktx = { group = "androidx.navigation", name = "navigation-ui-ktx", version.ref = "navigation" }
 palette-ktx = { group = "androidx.palette", name = "palette-ktx", version.ref = "paletteKtx" }
 preference-ktx = { group = "androidx.preference", name = "preference-ktx", version.ref = "preferenceKtx" }
 volley = { group = "com.android.volley", name = "volley", version.ref = "volley" }
 work-runtime-ktx = { group = "androidx.work", name = "work-runtime-ktx", version.ref = "workRuntimeKtx" }
+play-services-cast-framework = { group = "com.google.android.gms", name = "play-services-cast-framework", version.ref = "playServicesCastFramework" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }