RMS Visualizer

.idea/deploymentTargetSelector.xml

@@ -13,6 +13,9 @@
         </DropdownSelection>
         <DialogSelection />
       </SelectionState>
+      <SelectionState runConfigName="ExampleInstrumentedTest">
+        <option name="selectionMode" value="DROPDOWN" />
+      </SelectionState>
     </selectionStates>
   </component>
 </project>

.idea/misc.xml

@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">

app/src/main/java/dev/adriankuta/visualizer/data/RmsValueProvider.kt

@@ -0,0 +1,26 @@
+package dev.adriankuta.visualizer.data
+
+import kotlinx.coroutines.channels.BufferOverflow
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class RmsValueProvider @Inject constructor() {
+
+    private val currentRms =
+        MutableSharedFlow<RmsValue>(1, 1, onBufferOverflow = BufferOverflow.DROP_OLDEST)
+
+    fun emit(value: RmsValue) {
+        currentRms.tryEmit(value)
+    }
+
+    fun observe(): SharedFlow<RmsValue> = currentRms
+}
+
+data class RmsValue(
+    val current: Double,
+    val max: Double,
+    val min: Double = 0.0
+)

app/src/main/java/dev/adriankuta/visualizer/di/VisualizerModule.kt

@@ -9,7 +9,6 @@ import dagger.hilt.components.SingletonComponent
 import dev.adriankuta.visualizer.data.AudioVisualizer
 import dev.adriankuta.visualizer.data.AudioVisualizerController
 import dev.adriankuta.visualizer.data.AudioVisualizerImpl
-import dev.adriankuta.visualizer.domain.processors.FftToColor
 import dev.adriankuta.visualizer.domain.processors.HSLSoundToColorMapper
 import dev.adriankuta.visualizer.domain.processors.VisualizerProcessor
 import javax.inject.Singleton
@@ -28,10 +27,10 @@ abstract class VisualizerModule {
         audioVisualizerImpl: AudioVisualizerImpl
     ): AudioVisualizerController
 
-    /*@Binds
+    @Binds
-    abstract fun bindFftProcessor(
+    abstract fun bindProcessor(
-        fftToColor: WaveformToColorProcessor
+        fftToColor: HSLSoundToColorMapper
-    ): VisualizerProcessor*/
+    ): VisualizerProcessor
 
     companion object {
         @Provides
@@ -42,10 +41,10 @@ abstract class VisualizerModule {
             }
         }
 
-        @Provides
+        /*@Provides
         @Singleton
         fun provideProcessor(): VisualizerProcessor {
             return HSLSoundToColorMapper()
-        }
+        }*/
     }
 }

app/src/main/java/dev/adriankuta/visualizer/domain/processors/SoundToColorMapper.kt

@@ -4,11 +4,11 @@ import androidx.compose.ui.graphics.Color
 import dev.adriankuta.visualizer.HSL
 import dev.adriankuta.visualizer.MovingAverage
 import dev.adriankuta.visualizer.calculateRms
-import dev.adriankuta.visualizer.data.FftFrame
+import dev.adriankuta.visualizer.data.RmsValue
+import dev.adriankuta.visualizer.data.RmsValueProvider
 import dev.adriankuta.visualizer.data.VisualizerFrame
-import dev.adriankuta.visualizer.data.WaveformFrame
 import timber.log.Timber
-import kotlin.reflect.KClass
+import javax.inject.Inject
 
 /**
  * Default implementation of SoundToColorMapper that uses HSL color space
@@ -17,11 +17,12 @@ import kotlin.reflect.KClass
  * Follows Single Responsibility Principle by focusing on sound-to-color mapping.
  * Follows Dependency Inversion Principle by depending on abstractions.
  */
-class HSLSoundToColorMapper(
+class HSLSoundToColorMapper @Inject constructor(
-    private val baseHue: Float = 0f, // Blue hue as default
+    private val rmsValueProvider: RmsValueProvider
-    private val saturation: Float = 1f,
-    private val movingAverageWindowSize: Int = 2
 ) : VisualizerProcessor {
+    private val baseHue: Float = 0f // Blue hue as default
+    private val saturation: Float = 1f
+    private val movingAverageWindowSize: Int = 2
 
     private val movingAverage = MovingAverage(movingAverageWindowSize)
     private var rmsMax = 0.0
@@ -36,6 +37,7 @@ class HSLSoundToColorMapper(
         if (currentRms > rmsMax) {
             rmsMax = currentRms
         }
+        rmsValueProvider.emit(RmsValue(currentRms, rmsMax))
 
         Timber.d("Max RMS: %s, current %s", rmsMax, currentRms)
 

app/src/main/java/dev/adriankuta/visualizer/view/VisualizerScreen.kt

@@ -5,6 +5,7 @@ import android.content.pm.PackageManager
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.animation.animateColorAsState
+import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.animation.core.tween
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
@@ -35,6 +36,8 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.drawBehind
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
@@ -47,6 +50,7 @@ import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
 import androidx.lifecycle.compose.LocalLifecycleOwner
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import dev.adriankuta.visualizer.data.RmsValue
 import dev.adriankuta.visualizer.ui.components.KeepScreenOn
 import timber.log.Timber
 
@@ -136,8 +140,17 @@ fun VisualizerScreen(
             modifier = Modifier.padding(bottom = 32.dp)
         )
 
-        // Color display area
+        // Color display and RMS progress bar area
-        ColorDisplay(uiState)
+        Row(
+            horizontalArrangement = Arrangement.spacedBy(16.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            ColorDisplay(uiState)
+            RmsProgressBar(
+                rmsValue = uiState.rmsValue,
+                modifier = Modifier
+            )
+        }
 
         Spacer(modifier = Modifier.height(32.dp))
 
@@ -316,3 +329,101 @@ private fun StatusIndicator(
         )
     }
 }
+
+/**
+ * Vertical progress bar showing RMS values.
+ */
+@Composable
+private fun RmsProgressBar(
+    rmsValue: RmsValue?,
+    modifier: Modifier = Modifier
+) {
+    Card(
+        modifier = modifier,
+        colors = CardDefaults.cardColors(
+            containerColor = MaterialTheme.colorScheme.surface
+        ),
+        elevation = CardDefaults.cardElevation(defaultElevation = 4.dp)
+    ) {
+        Column(
+            modifier = Modifier.padding(16.dp),
+            horizontalAlignment = Alignment.CenterHorizontally
+        ) {
+            Text(
+                text = "RMS Level",
+                fontSize = 14.sp,
+                fontWeight = FontWeight.Medium,
+                color = MaterialTheme.colorScheme.onSurface
+            )
+
+            Spacer(modifier = Modifier.height(8.dp))
+
+            if (rmsValue != null) {
+                val animatedProgress by animateFloatAsState(
+                    targetValue = if (rmsValue.max > 0) {
+                        (rmsValue.current / rmsValue.max).coerceIn(0.0, 1.0).toFloat()
+                    } else {
+                        0f
+                    },
+                    animationSpec = tween(50)
+                )
+                val animatedColor by animateColorAsState(
+                    when {
+                        animatedProgress > 0.8f -> Color.Red
+                        animatedProgress > 0.6f -> Color.Yellow
+                        else -> Color.Green
+                    },
+                    animationSpec = tween(50)
+                )
+
+                // Vertical progress bar
+                Box(
+                    modifier = Modifier
+                        .width(40.dp)
+                        .height(200.dp)
+                        .clip(RoundedCornerShape(20.dp))
+                        .background(MaterialTheme.colorScheme.surfaceVariant)
+                ) {
+                    Box(
+                        modifier = Modifier
+                            .fillMaxSize()
+                            .clip(RoundedCornerShape(20.dp))
+                            .drawBehind {
+                                val fillHeight = size.height * animatedProgress
+                                drawRect(
+                                    color = animatedColor,
+                                    topLeft = Offset(0f, size.height - fillHeight),
+                                    size = Size(size.width, fillHeight)
+                                )
+                            }
+                    )
+                }
+
+                Spacer(modifier = Modifier.height(8.dp))
+
+                // Show current value
+                Text(
+                    text = String.format("%.3f", rmsValue.current),
+                    fontSize = 12.sp,
+                    color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.7f)
+                )
+            } else {
+                // Placeholder when no RMS data
+                Box(
+                    modifier = Modifier
+                        .width(40.dp)
+                        .height(200.dp)
+                        .clip(RoundedCornerShape(20.dp))
+                        .background(MaterialTheme.colorScheme.surfaceVariant),
+                    contentAlignment = Alignment.Center
+                ) {
+                    Text(
+                        text = "No Data",
+                        fontSize = 10.sp,
+                        color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.5f)
+                    )
+                }
+            }
+        }
+    }
+}

app/src/main/java/dev/adriankuta/visualizer/view/VisualizerScreenUiState.kt

@@ -1,8 +1,10 @@
 package dev.adriankuta.visualizer.view
 
 import androidx.compose.ui.graphics.Color
+import dev.adriankuta.visualizer.data.RmsValue
 
 data class VisualizerScreenUiState(
     val color: Color,
-    val isActive: Boolean = false
+    val isActive: Boolean = false,
+    val rmsValue: RmsValue? = null
 )

app/src/main/java/dev/adriankuta/visualizer/view/VisualizerScreenViewModel.kt

@@ -7,6 +7,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
 import dev.adriankuta.visualizer.data.AudioVisualizerController
+import dev.adriankuta.visualizer.data.RmsValueProvider
 import dev.adriankuta.visualizer.domain.ObserveVisualizerColorUseCase
 import kotlinx.coroutines.FlowPreview
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -20,25 +21,29 @@ import kotlin.time.Duration.Companion.milliseconds
 @HiltViewModel
 class VisualizerScreenViewModel @Inject constructor(
     observeVisualizerColorUseCase: ObserveVisualizerColorUseCase,
-    private val audioVisualizerController: AudioVisualizerController
+    private val audioVisualizerController: AudioVisualizerController,
+    private val rmsValueProvider: RmsValueProvider
 ) : ViewModel() {
 
     private val _isActive = MutableStateFlow(false)
 
     val uiState = combine(
         observeVisualizerColorUseCase().sample(50.milliseconds),
-        _isActive
+        _isActive,
-    ) { color, isActive ->
+        rmsValueProvider.observe().sample(50.milliseconds)
+    ) { color, isActive, rmsValue ->
         VisualizerScreenUiState(
             color = color,
-            isActive = isActive
+            isActive = isActive,
+            rmsValue = rmsValue
         )
     }.stateIn(
         scope = viewModelScope,
         started = SharingStarted.WhileSubscribed(5_000),
         initialValue = VisualizerScreenUiState(
             color = Color.Black,
-            isActive = false
+            isActive = false,
+            rmsValue = null
         )
     )
 

app/src/test/java/dev/adriankuta/visualizer/ExampleUnitTest.kt

@@ -1,17 +0,0 @@
-package dev.adriankuta.visualizer
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}