feat(ui): add television layouts and improve visualizer performance

app/src/main/cpp/CMakeLists.txt

@@ -18,21 +18,25 @@ project("radio")
 # 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, ${PROJECT_NAME}
+# the target library name; in the sub-module's CMakeLists.txt, the project name
 # is preferred for the same purpose.
 #
 # In order to load a library into your app from Java/Kotlin, you must call
 # System.loadLibrary() and pass the name of the library defined here;
 # for GameActivity/NativeActivity derived applications, the same library name must be
 # used in the AndroidManifest.xml file.
-add_library(${CMAKE_PROJECT_NAME} SHARED
-    # List C/C++ source files with relative paths to this CMakeLists.txt.
-    radio.cpp)
+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(${CMAKE_PROJECT_NAME}
-    # List libraries link to the target library
+target_link_libraries(dsp
     android
     log)
+target_link_libraries(extra
+    android
+    log)

app/src/main/cpp/dsp.cpp

@@ -0,0 +1,287 @@
+#include <jni.h>
+#include <vector>
+#include <cmath>
+#include <complex>
+#include <array>
+
+#if defined(__ARM_NEON)
+#include <arm_neon.h>
+#endif
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+static constexpr int FFT_SIZE = 512;
+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 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) BiquadBank {
+    alignas(16) std::array<float, NUM_EQ_BANDS> a0{}, a1{}, a2{}, b1{}, b2{};
+    alignas(16) std::array<float, NUM_EQ_BANDS> z1{}, z2{};
+    uint16_t activeMask = 0;
+
+    [[nodiscard]] inline bool hasActiveBands() const { return activeMask != 0; }
+
+    inline void setBandActive(int band, bool active) {
+        if (active) activeMask |= (1 << band);
+        else activeMask &= ~(1 << band);
+    }
+
+    inline void processBlock(float* __restrict__ data, int count) {
+        if (!this -> hasActiveBands()) return;
+        for (int i = 0; i < count; i++) {
+            float x = data[i];
+#pragma GCC unroll 10
+            for (int b = 0; b < NUM_EQ_BANDS; b++) {
+                if (activeMask & (1 << b)) {
+                    float y = x * a0[b] + z1[b];
+                    z1[b] = x * a1[b] + z2[b] - b1[b] * y + DENORMAL_OFFSET;
+                    z2[b] = x * a2[b] - b2[b] * y;
+                    x = y;
+                }
+            }
+            data[i] = x;
+        }
+    }
+
+    void setPeakingEQ(int band, float sr, float f, float g, float bw) {
+        if (band < 0 || band >= NUM_EQ_BANDS) return;
+        const bool active = std::abs(g) > 0.1f;
+        setBandActive(band, active);
+        if (!active) 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[band] = (1.0f + alpha * A) * invA0;
+        a1[band] = (-2.0f * c) * invA0;
+        a2[band] = (1.0f - alpha * A) * invA0;
+        b1[band] = (-2.0f * c) * invA0;
+        b2[band] = (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;
+    bool active = false;
+
+    inline float process(float x) {
+        if (!active) 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 setLowShelf(float sr,float f,float g,float q){
+        active=std::abs(g)>0.01f;
+        if(!active) return;
+        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;
+    }
+};
+
+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};
+    float mix = 0.0f;
+public:
+    inline void setMix(float m) { mix = m; }
+    inline float process(float x) {
+        if (mix < 0.01f) return x;
+        float out = 0.0f;
+#pragma GCC unroll 4
+        for (int i = 0; i < 4; i++) {
+            float delayed = combs[i].read();
+            out += delayed;
+            combs[i].write(x + delayed * combFeedback[i] + DENORMAL_OFFSET);
+            combs[i].advance();
+        }
+        out *= 0.25f;
+        for (int i = 0; i < 2; i++) {
+            float bufOut = allpasses[i].read();
+            float xOut = -0.5f * out + bufOut;
+            allpasses[i].write(out + 0.5f * bufOut);
+            allpasses[i].advance();
+            out = xOut;
+        }
+        return x * (1.0f - mix) + out * mix;
+    }
+    inline void processBlock(float* __restrict__ left, float* __restrict__ right, int count) {
+        if (mix < 0.01f) return;
+        for (int i = 0; i < count; i++) {
+            left[i] = process(left[i]);
+            right[i] = process(right[i]);
+        }
+    }
+};
+
+class CompressorOptimized {
+public:
+    float threshold = 0.3f, ratio = 4.0f, attack = 0.08f, release = 0.8f, sampleRate = 44100.0f;
+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;
+        attackCoef = expf(-1.0f / (attack * sampleRate));
+        releaseCoef = expf(-1.0f / (release * sampleRate));
+        coefficientsValid = true;
+    }
+    inline void processBlock(float* __restrict__ buffer, int count, float& envelope) {
+        updateCoefficients();
+        for(int i=0; i<count; i++){
+            float absInput = fabsf(buffer[i]);
+            envelope = (absInput > envelope) ? attackCoef*envelope + (1-attackCoef)*absInput : releaseCoef*envelope + (1-releaseCoef)*absInput;
+            float gain = (envelope>threshold)? (threshold + (envelope-threshold)/ratio)/(envelope+1e-9f) : 1.0f;
+            buffer[i]*=gain;
+        }
+    }
+    inline void process(float* __restrict__ left, float* __restrict__ right, int count) {
+        processBlock(left, count, envelopeL);
+        processBlock(right, count, envelopeR);
+    }
+};
+
+CompressorOptimized gCompressor;
+ReverbOptimized gReverbL, gReverbR;
+BiquadBank gEqL, gEqR;
+BassFilter gBassL, gBassR;
+bool gDrcEnabled = false, gEqEnabled = false, gBassBoostEnabled = false;
+float gStereoWidth = 1.0f;
+alignas(16) std::array<float, 4096> gLeftBuf, gRightBuf;
+alignas(16) std::array<float, 256> gFFTData;
+alignas(16) std::array<std::complex<float>, FFT_SIZE> gFFTWork;
+
+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 float fastSoftClip(float x) {
+    float ax = fabsf(x);
+    float sign = x > 0 ? 1.0f : -1.0f;
+    if (ax > 1.0f) return sign;
+    return x * (1.5f - 0.5f * x * x);
+}
+
+extern "C" {
+
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setDrcEnabled(JNIEnv*, jobject, jboolean e) { gDrcEnabled = e; }
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setReverbMix(JNIEnv*, jobject, jfloat m) { gReverbL.setMix(m); gReverbR.setMix(m); }
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setEqBand(JNIEnv*, jobject, jint b, jfloat g) {
+    if (b >= 0 && b < NUM_EQ_BANDS) {
+        gEqL.setPeakingEQ(b, 44100.0f, EQ_FREQUENCIES[b], g, 1.0f);
+        gEqR.setPeakingEQ(b, 44100.0f, EQ_FREQUENCIES[b], g, 1.0f);
+    }
+    gEqEnabled = gEqL.hasActiveBands();
+}
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setBassBoost(JNIEnv*, jobject, jfloat g) {
+    if (g > 0.01f) {
+        gBassL.setLowShelf(44100.0f, 150.0f, g, SQRT_2_INV);
+        gBassR.setLowShelf(44100.0f, 150.0f, g, SQRT_2_INV);
+        gBassBoostEnabled = true;
+    } else { gBassBoostEnabled = false; }
+}
+JNIEXPORT void JNICALL Java_com_michatec_radio_helpers_NativeAudioProcessor_setStereoWidth(JNIEnv*, jobject, jfloat w) { gStereoWidth = fmaxf(0.0f, fminf(w, 2.0f)); }
+
+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;
+}
+
+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;
+
+    for (int i = 0; i < numFrames; i++) {
+        gLeftBuf[i] = static_cast<float>(buffer[i * 2]) * INV_32768;
+        gRightBuf[i] = static_cast<float>(buffer[i * 2 + 1]) * INV_32768;
+    }
+
+    if (gEqEnabled) { gEqL.processBlock(gLeftBuf.data(), numFrames); gEqR.processBlock(gRightBuf.data(), numFrames); }
+    if (gBassBoostEnabled) {
+        for(int i=0; i<numFrames; i++) { gLeftBuf[i] = gBassL.process(gLeftBuf[i]); gRightBuf[i] = gBassR.process(gRightBuf[i]); }
+    }
+    gReverbL.processBlock(gLeftBuf.data(), gRightBuf.data(), numFrames);
+
+    if (gStereoWidth != 1.0f) {
+        float halfWidth = gStereoWidth * 0.5f;
+        for (int j = 0; j < numFrames; j++) {
+            float mid = (gLeftBuf[j] + gRightBuf[j]) * 0.5f;
+            float side = (gLeftBuf[j] - gRightBuf[j]) * halfWidth;
+            gLeftBuf[j] = mid + side; gRightBuf[j] = mid - side;
+        }
+    }
+
+    if (gDrcEnabled) gCompressor.process(gLeftBuf.data(), gRightBuf.data(), numFrames);
+
+    // FFT for visualization
+    for (int k = 0; k < FFT_SIZE; k++) {
+        gFFTWork[k] = (k < 256 && k < numFrames) ? std::complex<float>(gLeftBuf[k], 0.0f) : std::complex<float>(0.0f, 0.0f);
+    }
+    fastFFT(gFFTWork.data(), FFT_SIZE);
+    for (int k = 0; k < 256; k++) {
+        gFFTData[k] = std::abs(gFFTWork[k]) * 0.5f; // Increased scale
+    }
+
+    for (int k = 0; k < numFrames; k++) {
+        buffer[k * 2] = static_cast<jshort>(fastSoftClip(gLeftBuf[k]) * 32767.0f);
+        buffer[k * 2 + 1] = static_cast<jshort>(fastSoftClip(gRightBuf[k]) * 32767.0f);
+    }
+}
+}

app/src/main/cpp/extra.cpp

@@ -0,0 +1,70 @@
+#include <jni.h>
+#include <android/native_window_jni.h>
+#include <android/native_window.h>
+#include <android/log.h>
+#include <vector>
+#include <algorithm>
+
+
+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++) {
+            for (int x = 0; x < buffer.width; x++) {
+                pixels[y * buffer.stride + x] = 0xFF121212;
+            }
+        }
+
+        // Draw bars
+        int displayBins = std::min(static_cast<int>(len), 128);
+        float barWidth = static_cast<float>(buffer.width) / static_cast<float>(displayBins);
+
+        for (int i = 0; i < displayBins; i++) {
+            // Keep original order: bass (low freq) at left, treble (high freq) at right
+            float val = body[i];
+            float scaledVal = val * 5.0f;
+            int barHeight = static_cast<int>(scaledVal * static_cast<float>(buffer.height));
+
+            if (barHeight > buffer.height) barHeight = buffer.height;
+            if (barHeight < 12) barHeight = 12; // Min height
+
+            int startX = static_cast<int>(static_cast<float>(i) * barWidth);
+            int endX = static_cast<int>(static_cast<float>(i + 1) * barWidth);
+            int barBottom = buffer.height;
+            int barTop = barBottom - barHeight;
+
+            for (int x = startX; x <= endX; x++) {
+                if (x < 0 || x >= buffer.width) continue;
+                for (int y = barTop; y < barBottom; y++) {
+                    pixels[y * buffer.stride + x] = 0xFFC5DA03;
+                }
+            }
+        }
+
+        ANativeWindow_unlockAndPost(window);
+    }
+
+    env->ReleaseFloatArrayElements(data, body, JNI_ABORT);
+    ANativeWindow_release(window);
+}
+
+} // extern "C"

app/src/main/cpp/radio.cpp

@@ -1,208 +0,0 @@
-#include <jni.h>
-#include <string>
-#include <vector>
-#include <cmath>
-#include <algorithm>
-#include <android/log.h>
-
-// --- DSP Classes ---
-
-/**
- * Biquad Filter for EQ and Shelving
- */
-class Biquad {
-public:
-    float a0 = 1.0f, a1 = 0.0f, a2 = 0.0f, b1 = 0.0f, b2 = 0.0f;
-    float z1 = 0.0f, z2 = 0.0f;
-
-    void setPeakingEQ(float sampleRate, float freq, float gainDb, float bandwidth) {
-        float a = powf(10.0f, gainDb / 40.0f);
-        float w0 = 2.0f * static_cast<float>(M_PI) * freq / sampleRate;
-        float alpha = sinf(w0) * sinhf(logf(2.0f) / 2.0f * bandwidth * w0 / sinf(w0));
-
-        float b0 = 1.0f + alpha * a;
-        a1 = -2.0f * cosf(w0);
-        a2 = 1.0f - alpha * a;
-        float b0_inv = 1.0f / (1.0f + alpha / a);
-        b1 = -2.0f * cosf(w0) * b0_inv;
-        b2 = (1.0f - alpha / a) * b0_inv;
-        a0 = b0 * b0_inv;
-        a1 *= b0_inv;
-        a2 *= b0_inv;
-    }
-
-    void setLowShelf(float sampleRate, float frequency, float gainDb, float q) {
-        float a = powf(10.0f, gainDb / 40.0f);
-        float w0 = 2.0f * static_cast<float>(M_PI) * frequency / sampleRate;
-        float alpha = sinf(w0) / 2.0f * sqrtf((a + 1.0f / a) * (1.0f / q - 1.0f) + 2.0f);
-        float cosW0 = cosf(w0);
-
-        float b0 = a * ((a + 1.0f) - (a - 1.0f) * cosW0 + 2.0f * sqrtf(a) * alpha);
-        a1 = 2.0f * a * ((a - 1.0f) - (a + 1.0f) * cosW0);
-        a2 = a * ((a + 1.0f) - (a - 1.0f) * cosW0 - 2.0f * sqrtf(a) * alpha);
-        float b0_inv = 1.0f / ((a + 1.0f) + (a - 1.0f) * cosW0 + 2.0f * sqrtf(a) * alpha);
-        b1 = -2.0f * ((a - 1.0f) + (a + 1.0f) * cosW0) * b0_inv;
-        b2 = ((a + 1.0f) + (a - 1.0f) * cosW0 - 2.0f * sqrtf(a) * alpha) * b0_inv;
-        a0 = b0 * b0_inv;
-        a1 *= b0_inv;
-        a2 *= b0_inv;
-    }
-
-    float process(float in) {
-        float out = in * a0 + z1;
-        z1 = in * a1 + z2 - b1 * out;
-        z2 = in * a2 - b2 * out;
-        return out;
-    }
-};
-
-/**
- * Dynamic Range Compressor
- */
-class Compressor {
-public:
-    float threshold = 0.3f;
-    float ratio = 4.0f;
-    float attack = 0.01f;
-    float release = 0.2f;
-    float sampleRate = 44100.0f;
-    float envelope = 0.0f;
-
-    void process(float* buffer, int size) {
-        float attackCoef = expf(-1.0f / (attack * sampleRate));
-        float releaseCoef = expf(-1.0f / (release * sampleRate));
-
-        for (int i = 0; i < size; ++i) {
-            float absInput = std::abs(buffer[i]);
-            if (absInput > envelope)
-                envelope = attackCoef * (envelope - absInput) + absInput;
-            else
-                envelope = releaseCoef * (envelope - absInput) + absInput;
-
-            if (envelope > threshold) {
-                float gainReduction = threshold + (envelope - threshold) / ratio;
-                buffer[i] *= (gainReduction / envelope);
-            }
-        }
-    }
-};
-
-/**
- * Simple Reverb (Comb Filter based)
- */
-class Reverb {
-public:
-    std::vector<float> d1, d2, d3;
-    size_t p1 = 0, p2 = 0, p3 = 0;
-
-    float feedback = 0.7f;
-    float mix = 0.0f;
-
-    Reverb() {
-        d1.resize(11025, 0.0f); // 250ms
-        d2.resize(14700, 0.0f); // 333ms
-        d3.resize(17640, 0.0f); // 400ms
-    }
-
-    float process(float in) {
-        float y1 = d1[p1];
-        float y2 = d2[p2];
-        float y3 = d3[p3];
-
-        d1[p1] = in + y1 * feedback;
-        d2[p2] = in + y2 * feedback;
-        d3[p3] = in + y3 * feedback;
-
-        p1 = (p1 + 1) % d1.size();
-        p2 = (p2 + 1) % d2.size();
-        p3 = (p3 + 1) % d3.size();
-
-        float reverb = (y1 + y2 + y3) / 3.0f;
-
-        return in * (1.0f - mix) + reverb * mix;
-    }
-};
-
-// --- Global Engine State ---
-Compressor gCompressor;
-Reverb gReverb;
-std::vector<Biquad> gEqBands(10);
-Biquad gBassBoost;
-
-bool gDrcEnabled = false;
-bool gReverbEnabled = false;
-bool gEqEnabled = false;
-bool gBassBoostEnabled = false;
-
-extern "C" {
-
-JNIEXPORT void JNICALL
-Java_com_michatec_radio_helpers_NativeAudioProcessor_setDrcEnabled(JNIEnv *env, jobject thiz, jboolean enabled) {
-    gDrcEnabled = enabled;
-}
-
-JNIEXPORT void JNICALL
-Java_com_michatec_radio_helpers_NativeAudioProcessor_setReverbMix(JNIEnv *env, jobject thiz, jfloat mix) {
-    gReverb.mix = mix;
-    gReverbEnabled = (mix > 0.01f);
-}
-
-JNIEXPORT void JNICALL
-Java_com_michatec_radio_helpers_NativeAudioProcessor_setEqBand(JNIEnv *env, jobject thiz, jint band, jfloat gainDb) {
-    float freqs[] = {31.25f, 62.5f, 125.0f, 250.0f, 500.0f, 1000.0f, 2000.0f, 4000.0f, 8000.0f, 16000.0f};
-    if (band >= 0 && band < 10) {
-        gEqBands[static_cast<size_t>(band)].setPeakingEQ(44100.0f, freqs[band], gainDb, 1.0f);
-        gEqEnabled = true;
-    }
-}
-
-JNIEXPORT void JNICALL
-Java_com_michatec_radio_helpers_NativeAudioProcessor_setBassBoost(JNIEnv *env, jobject thiz, jfloat gainDb) {
-    if (gainDb > 0.0f) {
-        gBassBoost.setLowShelf(44100.0f, 150.0f, gainDb, 0.707f);
-        gBassBoostEnabled = true;
-    } else {
-        gBassBoostEnabled = false;
-    }
-}
-
-JNIEXPORT void JNICALL
-Java_com_michatec_radio_helpers_NativeAudioProcessor_processAudio(JNIEnv *env, jobject thiz, jshortArray data, jint size) {
-    jshort *buffer = env->GetShortArrayElements(data, nullptr);
-    if (!buffer) return;
-
-    std::vector<float> floatBuf(static_cast<size_t>(size));
-    for (int i = 0; i < size; ++i) floatBuf[static_cast<size_t>(i)] = static_cast<float>(buffer[i]) / 32768.0f;
-
-    // Apply EQ
-    if (gEqEnabled) {
-        for (auto &band : gEqBands) {
-            for (int i = 0; i < size; ++i) floatBuf[static_cast<size_t>(i)] = band.process(floatBuf[static_cast<size_t>(i)]);
-        }
-    }
-
-    // Apply Bass Boost
-    if (gBassBoostEnabled) {
-        for (int i = 0; i < size; ++i) floatBuf[static_cast<size_t>(i)] = gBassBoost.process(floatBuf[static_cast<size_t>(i)]);
-    }
-
-    // Apply Reverb
-    if (gReverbEnabled) {
-        for (int i = 0; i < size; ++i) floatBuf[static_cast<size_t>(i)] = gReverb.process(floatBuf[static_cast<size_t>(i)]);
-    }
-
-    // Apply Compressor (at the end to prevent clipping)
-    if (gDrcEnabled) {
-        gCompressor.process(floatBuf.data(), size);
-    }
-
-    // Back to short
-    for (int i = 0; i < size; ++i) {
-        float out = std::max(-1.0f, std::min(1.0f, floatBuf[static_cast<size_t>(i)]));
-        buffer[i] = static_cast<jshort>(out * 32767.0f);
-    }
-
-    env->ReleaseShortArrayElements(data, buffer, 0);
-}
-
-} // extern "C"

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

@@ -9,10 +9,25 @@ import androidx.preference.SeekBarPreference
 import com.michatec.radio.helpers.PreferencesHelper
 
 /*
- * EqualizerFragment class: Handles audio frequency settings
+ * 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)
@@ -28,46 +43,25 @@ class EqualizerFragment : PreferenceFragmentCompat() {
         resetPreference.setIcon(R.drawable.ic_refresh_24dp)
         resetPreference.setOnPreferenceClickListener {
             PreferencesHelper.resetEqualizer()
-            // Manually update SeekBars to 0
-            findPreference<SeekBarPreference>(Keys.PREF_EQ_LOW)?.value = 0
-            findPreference<SeekBarPreference>(Keys.PREF_EQ_MID)?.value = 0
-            findPreference<SeekBarPreference>(Keys.PREF_EQ_HIGH)?.value = 0
+            for (key in eqKeys) {
+                findPreference<SeekBarPreference>(key)?.value = 0
+            }
             return@setOnPreferenceClickListener true
         }
         screen.addPreference(resetPreference)
 
-        // EQ Low
-        val eqLow = SeekBarPreference(context)
-        eqLow.title = getString(R.string.pref_eq_low_title)
-        eqLow.key = Keys.PREF_EQ_LOW
-        eqLow.setIcon(R.drawable.ic_music_note_24dp)
-        eqLow.min = -12
-        eqLow.max = 12
-        eqLow.showSeekBarValue = true
-        eqLow.setDefaultValue(0)
-        screen.addPreference(eqLow)
-
-        // EQ Mid
-        val eqMid = SeekBarPreference(context)
-        eqMid.title = getString(R.string.pref_eq_mid_title)
-        eqMid.key = Keys.PREF_EQ_MID
-        eqMid.setIcon(R.drawable.ic_music_note_24dp)
-        eqMid.min = -12
-        eqMid.max = 12
-        eqMid.showSeekBarValue = true
-        eqMid.setDefaultValue(0)
-        screen.addPreference(eqMid)
-
-        // EQ High
-        val eqHigh = SeekBarPreference(context)
-        eqHigh.title = getString(R.string.pref_eq_high_title)
-        eqHigh.key = Keys.PREF_EQ_HIGH
-        eqHigh.setIcon(R.drawable.ic_music_note_24dp)
-        eqHigh.min = -12
-        eqHigh.max = 12
-        eqHigh.showSeekBarValue = true
-        eqHigh.setDefaultValue(0)
-        screen.addPreference(eqHigh)
+        // 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/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"
@@ -66,6 +68,30 @@ object Keys {
     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

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

@@ -286,20 +286,61 @@ class PlayerService : MediaLibraryService(), SharedPreferences.OnSharedPreferenc
 
     /* Applies audio effects based on preferences */
     private fun applyAudioEffects() {
-        nativeAudioProcessor.enableBassBoost(PreferencesHelper.loadBassBoost())
-        nativeAudioProcessor.setReverb(PreferencesHelper.loadReverb())
-        nativeAudioProcessor.enableDrc(PreferencesHelper.loadDrcEnabled())
-        nativeAudioProcessor.setEq(0, PreferencesHelper.loadEqLow())
-        nativeAudioProcessor.setEq(1, PreferencesHelper.loadEqMid())
-        nativeAudioProcessor.setEq(2, PreferencesHelper.loadEqHigh())
+        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_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()
             }
         }
@@ -334,6 +375,7 @@ class PlayerService : MediaLibraryService(), SharedPreferences.OnSharedPreferenc
             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)
         }
 
@@ -420,6 +462,19 @@ class PlayerService : MediaLibraryService(), SharedPreferences.OnSharedPreferenc
                         )
                     )
                 }
+                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)
         }

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

@@ -17,6 +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.*
@@ -30,7 +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 */
@@ -52,6 +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)
@@ -190,6 +194,7 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
         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)
 
@@ -198,6 +203,7 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
         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)
 
@@ -206,19 +212,53 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
         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.summary = getString(R.string.pref_equalizer_summary)
+        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)
@@ -268,7 +308,7 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
         // set preference categories
         val preferenceCategoryGeneral = PreferenceCategory(activity as Context)
         preferenceCategoryGeneral.title = getString(R.string.pref_general_title)
-        
+
         val preferenceCategoryAudioEffects = PreferenceCategory(context)
         preferenceCategoryAudioEffects.title = getString(R.string.pref_audio_effects_title)
 
@@ -295,7 +335,9 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
         preferenceCategoryAudioEffects.addPreference(preferenceBassBoost)
         preferenceCategoryAudioEffects.addPreference(preferenceReverb)
         preferenceCategoryAudioEffects.addPreference(preferenceDrc)
+        preferenceCategoryAudioEffects.addPreference(preferencePresetSelection)
         preferenceCategoryAudioEffects.addPreference(preferenceEqualizer)
+        preferenceCategoryAudioEffects.addPreference(preferenceVisualizer)
 
         screen.addPreference(preferenceCategoryMaintenance)
         preferenceCategoryMaintenance.addPreference(preferenceUpdateStationImages)
@@ -340,6 +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,

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/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/NativeAudioProcessor.kt

@@ -1,5 +1,6 @@
 package com.michatec.radio.helpers
 
+import android.util.Log
 import androidx.annotation.OptIn
 import androidx.media3.common.C
 import androidx.media3.common.audio.AudioProcessor
@@ -13,46 +14,117 @@ import java.nio.ByteOrder
 class NativeAudioProcessor : BaseAudioProcessor() {
 
     companion object {
+        private const val TAG = "NativeAudioProcessor"
         init {
-            System.loadLibrary("radio")
+            try {
+                System.loadLibrary("dsp")
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to load dsp library", e)
+            }
         }
     }
 
-    // JNI Methods
+    private var directBuffer: ByteBuffer? = null
+
+    // ===== JNI =====
     private external fun setDrcEnabled(enabled: Boolean)
     private external fun setReverbMix(mix: Float)
     private external fun setEqBand(band: Int, gainDb: Float)
     private external fun setBassBoost(gainDb: Float)
-    private external fun processAudio(data: ShortArray, size: Int)
+    private external fun setStereoWidth(width: Float)
+    private external fun processAudioDirect(buf: ByteBuffer, size: Int)
+    private external fun getFftData(): FloatArray
 
-    // Public API
+    // ===== API =====
     fun enableDrc(enabled: Boolean) = setDrcEnabled(enabled)
     fun setReverb(mix: Float) = setReverbMix(mix)
     fun setEq(band: Int, gainDb: Float) = setEqBand(band, gainDb)
+    fun setEqAll(gains: FloatArray) {
+        gains.forEachIndexed { i, g -> setEq(i, g) }
+    }
     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)
         }
         return inputAudioFormat
     }
 
     override fun queueInput(inputBuffer: ByteBuffer) {
-        val remaining = inputBuffer.remaining()
-        if (remaining == 0) return
+        val size = inputBuffer.remaining()
+        if (size == 0) return
 
-        val shortArraySize = remaining / 2
-        val shortArray = ShortArray(shortArraySize)
+        // Always ensure we have a direct buffer for JNI
+        if (directBuffer == null || directBuffer!!.capacity() < size) {
+            directBuffer = ByteBuffer.allocateDirect(size).order(ByteOrder.nativeOrder())
+        }
+        
+        directBuffer!!.clear()
+        inputBuffer.position()
+        directBuffer!!.put(inputBuffer)
+        
+        directBuffer!!.flip()
+        
+        // Process audio in JNI
+        processAudioDirect(directBuffer!!, size)
 
-        inputBuffer.order(ByteOrder.nativeOrder()).asShortBuffer().get(shortArray)
+        // Copy processed data back to output
+        val out = replaceOutputBuffer(size)
+        out.order(ByteOrder.nativeOrder())
+        
+        directBuffer!!.position(0)
+        out.put(directBuffer!!)
+        out.flip()
 
-        processAudio(shortArray, shortArraySize)
+    }
 
-        val outputBuffer = replaceOutputBuffer(remaining)
-        outputBuffer.asShortBuffer().put(shortArray)
-        outputBuffer.limit(remaining)
+    override fun onReset() {
+        super.onReset()
+        directBuffer = null
+    }
 
-        inputBuffer.position(inputBuffer.limit())
+    // ===== Presets =====
+    fun setPresetRock() {
+        enableDrc(true)
+        setReverb(0.10f)
+        setWidth(1.1f)
+        setEqAll(floatArrayOf(2f, 1f, 0f, -1f, -1f, 0f, 1f, 2f, 2f, 3f))
+        enableBassBoost(0.6f)
+    }
+
+    fun setPresetPop() {
+        enableDrc(true)
+        setReverb(0.15f)
+        setWidth(1.05f)
+        setEqAll(floatArrayOf(0f, 1f, 1f, 1f, 0f, 0f, 1f, 2f, 2f, 1f))
+        enableBassBoost(0.5f)
+    }
+
+    fun setPresetJazz() {
+        enableDrc(false)
+        setReverb(0.15f)
+        setWidth(1.0f)
+        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

@@ -257,13 +257,13 @@ object PreferencesHelper {
 
     /* Loads Bass Boost gain */
     fun loadBassBoost(): Float {
-        return if (sharedPreferences.getBoolean(Keys.PREF_BASS_BOOST, false)) 5.0f else 0.0f
+        return if (sharedPreferences.getBoolean(Keys.PREF_BASS_BOOST, false)) 0.4f else 0.0f
     }
 
 
     /* Loads Reverb mix */
     fun loadReverb(): Float {
-        return if (sharedPreferences.getBoolean(Keys.PREF_REVERB, false)) 0.3f else 0.0f
+        return if (sharedPreferences.getBoolean(Keys.PREF_REVERB, false)) 0.2f else 0.0f
     }
 
 
@@ -272,10 +272,69 @@ object PreferencesHelper {
         return sharedPreferences.getBoolean(Keys.PREF_DRC, false)
     }
 
-    /* Loads EQ gains */
-    fun loadEqLow(): Float = sharedPreferences.getInt(Keys.PREF_EQ_LOW, 0).toFloat()
-    fun loadEqMid(): Float = sharedPreferences.getInt(Keys.PREF_EQ_MID, 0).toFloat()
-    fun loadEqHigh(): Float = sharedPreferences.getInt(Keys.PREF_EQ_HIGH, 0).toFloat()
+    /* 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() {

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/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/navigation/nav_graph_main.xml

@@ -23,6 +23,9 @@
         <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>
 
     <!-- EQUALIZER -->
@@ -31,4 +34,9 @@
         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

@@ -55,7 +55,6 @@
     <string name="pref_update_collection_summary">Die neueste Version aller Senderinformationen herunterladen.</string>
     <string name="dialog_yes_no_message_update_collection">Die neueste Version aller Senderinformationen herunterladen?</string>
     <string name="dialog_yes_no_positive_button_update_collection">Aktualisieren</string>
-    <string name="pref_eq_high_title">Equalizer: Höhen</string>
     <string name="pref_advanced_title">Erweitert</string>
     <string name="pref_app_version_summary">Version</string>
     <string name="pref_app_version_title">App-Version</string>
@@ -125,9 +124,27 @@
     <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: Bass</string>
-    <string name="pref_eq_mid_title">Equalizer: Mitten</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/strings.xml

@@ -70,12 +70,27 @@
     <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: Low</string>
-    <string name="pref_eq_mid_title">Equalizer: Mid</string>
-    <string name="pref_eq_high_title">Equalizer: High</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>
@@ -158,4 +173,6 @@
     <!-- 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>