commit e856638e5326ebc7f6de83d44b6577304cd32d1c Author: bruno Date: Mon Nov 3 21:07:27 2025 +0100 Init diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..aa724b7 --- /dev/null +++ b/.gitignore @@ -0,0 +1,15 @@ +*.iml +.gradle +/local.properties +/.idea/caches +/.idea/libraries +/.idea/modules.xml +/.idea/workspace.xml +/.idea/navEditor.xml +/.idea/assetWizardSettings.xml +.DS_Store +/build +/captures +.externalNativeBuild +.cxx +local.properties diff --git a/.idea/.gitignore b/.idea/.gitignore new file mode 100644 index 0000000..26d3352 --- /dev/null +++ b/.idea/.gitignore @@ -0,0 +1,3 @@ +# Default ignored files +/shelf/ +/workspace.xml diff --git a/.idea/.name b/.idea/.name new file mode 100644 index 0000000..18d2731 --- /dev/null +++ b/.idea/.name @@ -0,0 +1 @@ +Audio data \ No newline at end of file diff --git a/.idea/AndroidProjectSystem.xml b/.idea/AndroidProjectSystem.xml new file mode 100644 index 0000000..4a53bee --- /dev/null +++ b/.idea/AndroidProjectSystem.xml @@ -0,0 +1,6 @@ + + + + + \ No newline at end of file diff --git a/.idea/compiler.xml b/.idea/compiler.xml new file mode 100644 index 0000000..b86273d --- /dev/null +++ b/.idea/compiler.xml @@ -0,0 +1,6 @@ + + + + + + \ No newline at end of file diff --git a/.idea/deploymentTargetSelector.xml b/.idea/deploymentTargetSelector.xml new file mode 100644 index 0000000..b268ef3 --- /dev/null +++ b/.idea/deploymentTargetSelector.xml @@ -0,0 +1,10 @@ + + + + + + + + + \ No newline at end of file diff --git a/.idea/gradle.xml b/.idea/gradle.xml new file mode 100644 index 0000000..639c779 --- /dev/null +++ b/.idea/gradle.xml @@ -0,0 +1,19 @@ + + + + + + + \ No newline at end of file diff --git a/.idea/migrations.xml b/.idea/migrations.xml new file mode 100644 index 0000000..f8051a6 --- /dev/null +++ b/.idea/migrations.xml @@ -0,0 +1,10 @@ + + + + + + \ No newline at end of file diff --git a/.idea/misc.xml b/.idea/misc.xml new file mode 100644 index 0000000..74dd639 --- /dev/null +++ b/.idea/misc.xml @@ -0,0 +1,10 @@ + + + + + + + + + \ No newline at end of file diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml new file mode 100644 index 0000000..16660f1 --- /dev/null +++ b/.idea/runConfigurations.xml @@ -0,0 +1,17 @@ + + + + + + \ No newline at end of file diff --git a/.idea/vcs.xml b/.idea/vcs.xml new file mode 100644 index 0000000..94a25f7 --- /dev/null +++ b/.idea/vcs.xml @@ -0,0 +1,6 @@ + + + + + + \ No newline at end of file diff --git a/app/.gitignore b/app/.gitignore new file mode 100644 index 0000000..42afabf --- /dev/null +++ b/app/.gitignore @@ -0,0 +1 @@ +/build \ No newline at end of file diff --git a/app/build.gradle.kts b/app/build.gradle.kts new file mode 100644 index 0000000..f032e46 --- /dev/null +++ b/app/build.gradle.kts @@ -0,0 +1,61 @@ +plugins { + alias(libs.plugins.android.application) + alias(libs.plugins.kotlin.android) + alias(libs.plugins.kotlin.compose) +} + +android { + namespace = "systems.brn.audiodata" + compileSdk = 36 + + defaultConfig { + applicationId = "systems.brn.audiodata" + minSdk = 28 + targetSdk = 36 + versionCode = 1 + versionName = "1.0" + + testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner" + } + + buildTypes { + release { + isMinifyEnabled = false + proguardFiles( + getDefaultProguardFile("proguard-android-optimize.txt"), + "proguard-rules.pro" + ) + } + } + compileOptions { + sourceCompatibility = JavaVersion.VERSION_11 + targetCompatibility = JavaVersion.VERSION_11 + } + kotlinOptions { + jvmTarget = "11" + } + buildFeatures { + compose = true + } +} + +dependencies { + + implementation(libs.androidx.core.ktx) + implementation(libs.androidx.lifecycle.runtime.ktx) + implementation(libs.androidx.activity.compose) + implementation(platform(libs.androidx.compose.bom)) + implementation(libs.androidx.ui) + implementation(libs.androidx.ui.graphics) + implementation(libs.androidx.ui.tooling.preview) + implementation(libs.androidx.material3) + implementation(libs.androidx.appcompat) + testImplementation(libs.junit) + androidTestImplementation(libs.androidx.junit) + androidTestImplementation(libs.androidx.espresso.core) + androidTestImplementation(platform(libs.androidx.compose.bom)) + androidTestImplementation(libs.androidx.ui.test.junit4) + debugImplementation(libs.androidx.ui.tooling) + debugImplementation(libs.androidx.ui.test.manifest) + implementation(libs.jtransforms) +} \ No newline at end of file diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro new file mode 100644 index 0000000..481bb43 --- /dev/null +++ b/app/proguard-rules.pro @@ -0,0 +1,21 @@ +# Add project specific ProGuard rules here. +# You can control the set of applied configuration files using the +# proguardFiles setting in build.gradle. +# +# For more details, see +# http://developer.android.com/guide/developing/tools/proguard.html + +# If your project uses WebView with JS, uncomment the following +# and specify the fully qualified class name to the JavaScript interface +# class: +#-keepclassmembers class fqcn.of.javascript.interface.for.webview { +# public *; +#} + +# Uncomment this to preserve the line number information for +# debugging stack traces. +#-keepattributes SourceFile,LineNumberTable + +# If you keep the line number information, uncomment this to +# hide the original source file name. +#-renamesourcefileattribute SourceFile \ No newline at end of file diff --git a/app/src/androidTest/java/systems/brn/audiodata/ExampleInstrumentedTest.kt b/app/src/androidTest/java/systems/brn/audiodata/ExampleInstrumentedTest.kt new file mode 100644 index 0000000..1e64323 --- /dev/null +++ b/app/src/androidTest/java/systems/brn/audiodata/ExampleInstrumentedTest.kt @@ -0,0 +1,24 @@ +package systems.brn.audiodata + +import androidx.test.platform.app.InstrumentationRegistry +import androidx.test.ext.junit.runners.AndroidJUnit4 + +import org.junit.Test +import org.junit.runner.RunWith + +import org.junit.Assert.* + +/** + * Instrumented test, which will execute on an Android device. + * + * See [testing documentation](http://d.android.com/tools/testing). + */ +@RunWith(AndroidJUnit4::class) +class ExampleInstrumentedTest { + @Test + fun useAppContext() { + // Context of the app under test. + val appContext = InstrumentationRegistry.getInstrumentation().targetContext + assertEquals("systems.brn.audiodata", appContext.packageName) + } +} \ No newline at end of file diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml new file mode 100644 index 0000000..26d2585 --- /dev/null +++ b/app/src/main/AndroidManifest.xml @@ -0,0 +1,27 @@ + + + + + + + + + + + + + + \ No newline at end of file diff --git a/app/src/main/java/systems/brn/audiodata/MainActivity.java b/app/src/main/java/systems/brn/audiodata/MainActivity.java new file mode 100644 index 0000000..48a5f98 --- /dev/null +++ b/app/src/main/java/systems/brn/audiodata/MainActivity.java @@ -0,0 +1,143 @@ +package systems.brn.audiodata; + +import android.Manifest; +import android.content.pm.PackageManager; +import android.os.Bundle; +import android.os.Handler; +import android.os.Looper; +import android.widget.Button; +import android.widget.TextView; +import androidx.annotation.NonNull; +import androidx.appcompat.app.AppCompatActivity; +import androidx.core.app.ActivityCompat; +import androidx.core.content.ContextCompat; + +import com.github.wendykierp.JTransforms.DoubleFFT_1D; + +import android.media.AudioFormat; +import android.media.AudioRecord; +import android.media.MediaRecorder; + +public class MainActivity extends AppCompatActivity { + + private static final int REQUEST_MIC = 1; + private TextView textView; + private Button startButton; + + private static final int SAMPLE_RATE = 44100; + private static final int FRAME_SIZE = 2048; + private static final int HOP = 512; + private static final int FRAMES_PER_BIT = 8; + private static final int TARGET_BINS = 150; + private static final int SEED = 1; + + private Handler mainHandler; + + @Override + protected void onCreate(Bundle savedInstanceState) { + super.onCreate(savedInstanceState); + setContentView(R.layout.activity_main); + textView = findViewById(R.id.textView); + startButton = findViewById(R.id.startButton); + mainHandler = new Handler(Looper.getMainLooper()); + + startButton.setOnClickListener(v -> { + if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) + != PackageManager.PERMISSION_GRANTED) { + ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO}, REQUEST_MIC); + } else { + startExtraction(); + } + }); + } + + private void startExtraction() { + new Thread(() -> { + int bufferSize = FRAME_SIZE; + AudioRecord mic = new AudioRecord( + MediaRecorder.AudioSource.MIC, + SAMPLE_RATE, + AudioFormat.CHANNEL_IN_MONO, + AudioFormat.ENCODING_PCM_16BIT, + bufferSize * 2 + ); + short[] buffer = new short[FRAME_SIZE]; + double[] frame = new double[FRAME_SIZE]; + double[] fftData = new double[FRAME_SIZE]; + DoubleFFT_1D fft = new DoubleFFT_1D(FRAME_SIZE); + + int maxBits = 1024; + int[] recoveredBits = new int[maxBits]; + + mic.startRecording(); + int frameNo = 0; + + while (frameNo < maxBits * FRAMES_PER_BIT) { + int read = mic.read(buffer, 0, FRAME_SIZE); + if (read < FRAME_SIZE) break; + + // Apply Hann window + for (int i = 0; i < FRAME_SIZE; i++) { + frame[i] = buffer[i] * 0.5 * (1 - Math.cos(2 * Math.PI * i / (FRAME_SIZE - 1))); + fftData[i] = frame[i]; + } + + fft.realForward(fftData); + + int[] chips = generatePN(TARGET_BINS, SEED); + + double corr = 0.0; + int binMin = 50; // adjust for your frequency band + for (int k = 0; k < TARGET_BINS; k++) { + int bin = binMin + k; + double re = fftData[2 * bin]; + double im = fftData[2 * bin + 1]; + double mag = Math.sqrt(re * re + im * im) + 1e-9; + corr += (re / mag) * chips[k]; + } + + int whichBit = frameNo / FRAMES_PER_BIT; + if (whichBit < maxBits) { + recoveredBits[whichBit] += corr > 0 ? 1 : 0; + } + + frameNo++; + } + + mic.stop(); + mic.release(); + + // Convert bits -> bytes -> string + byte[] out = new byte[(maxBits + 7) / 8]; + for (int i = 0; i < maxBits; i++) { + if (recoveredBits[i] > 0) out[i / 8] |= 1 << (i % 8); + } + + String extractedMessage = new String(out).trim(); + + mainHandler.post(() -> textView.setText(extractedMessage)); + + }).start(); + } + + private int[] generatePN(int length, int seed) { + int[] chips = new int[length]; + int state = seed; + for (int i = 0; i < length; i++) { + state ^= (state << 13); + state ^= (state >>> 17); + state ^= (state << 5); + chips[i] = (state & 1) != 0 ? 1 : -1; + } + return chips; + } + + @Override + public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, + @NonNull int[] grantResults) { + if (requestCode == REQUEST_MIC && grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { + startExtraction(); + } + } +} + diff --git a/app/src/main/java/systems/brn/audiodata/ui/theme/Color.kt b/app/src/main/java/systems/brn/audiodata/ui/theme/Color.kt new file mode 100644 index 0000000..1678a44 --- /dev/null +++ b/app/src/main/java/systems/brn/audiodata/ui/theme/Color.kt @@ -0,0 +1,11 @@ +package systems.brn.audiodata.ui.theme + +import androidx.compose.ui.graphics.Color + +val Purple80 = Color(0xFFD0BCFF) +val PurpleGrey80 = Color(0xFFCCC2DC) +val Pink80 = Color(0xFFEFB8C8) + +val Purple40 = Color(0xFF6650a4) +val PurpleGrey40 = Color(0xFF625b71) +val Pink40 = Color(0xFF7D5260) \ No newline at end of file diff --git a/app/src/main/java/systems/brn/audiodata/ui/theme/Theme.kt b/app/src/main/java/systems/brn/audiodata/ui/theme/Theme.kt new file mode 100644 index 0000000..fb8aec4 --- /dev/null +++ b/app/src/main/java/systems/brn/audiodata/ui/theme/Theme.kt @@ -0,0 +1,58 @@ +package systems.brn.audiodata.ui.theme + +import android.app.Activity +import android.os.Build +import androidx.compose.foundation.isSystemInDarkTheme +import androidx.compose.material3.MaterialTheme +import androidx.compose.material3.darkColorScheme +import androidx.compose.material3.dynamicDarkColorScheme +import androidx.compose.material3.dynamicLightColorScheme +import androidx.compose.material3.lightColorScheme +import androidx.compose.runtime.Composable +import androidx.compose.ui.platform.LocalContext + +private val DarkColorScheme = darkColorScheme( + primary = Purple80, + secondary = PurpleGrey80, + tertiary = Pink80 +) + +private val LightColorScheme = lightColorScheme( + primary = Purple40, + secondary = PurpleGrey40, + tertiary = Pink40 + + /* Other default colors to override + background = Color(0xFFFFFBFE), + surface = Color(0xFFFFFBFE), + onPrimary = Color.White, + onSecondary = Color.White, + onTertiary = Color.White, + onBackground = Color(0xFF1C1B1F), + onSurface = Color(0xFF1C1B1F), + */ +) + +@Composable +fun AudioDataTheme( + darkTheme: Boolean = isSystemInDarkTheme(), + // Dynamic color is available on Android 12+ + dynamicColor: Boolean = true, + content: @Composable () -> Unit +) { + val colorScheme = when { + dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> { + val context = LocalContext.current + if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context) + } + + darkTheme -> DarkColorScheme + else -> LightColorScheme + } + + MaterialTheme( + colorScheme = colorScheme, + typography = Typography, + content = content + ) +} \ No newline at end of file diff --git a/app/src/main/java/systems/brn/audiodata/ui/theme/Type.kt b/app/src/main/java/systems/brn/audiodata/ui/theme/Type.kt new file mode 100644 index 0000000..f117eb1 --- /dev/null +++ b/app/src/main/java/systems/brn/audiodata/ui/theme/Type.kt @@ -0,0 +1,34 @@ +package systems.brn.audiodata.ui.theme + +import androidx.compose.material3.Typography +import androidx.compose.ui.text.TextStyle +import androidx.compose.ui.text.font.FontFamily +import androidx.compose.ui.text.font.FontWeight +import androidx.compose.ui.unit.sp + +// Set of Material typography styles to start with +val Typography = Typography( + bodyLarge = TextStyle( + fontFamily = FontFamily.Default, + fontWeight = FontWeight.Normal, + fontSize = 16.sp, + lineHeight = 24.sp, + letterSpacing = 0.5.sp + ) + /* Other default text styles to override + titleLarge = TextStyle( + fontFamily = FontFamily.Default, + fontWeight = FontWeight.Normal, + fontSize = 22.sp, + lineHeight = 28.sp, + letterSpacing = 0.sp + ), + labelSmall = TextStyle( + fontFamily = FontFamily.Default, + fontWeight = FontWeight.Medium, + fontSize = 11.sp, + lineHeight = 16.sp, + letterSpacing = 0.5.sp + ) + */ +) \ No newline at end of file diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml new file mode 100644 index 0000000..07d5da9 --- /dev/null +++ b/app/src/main/res/drawable/ic_launcher_background.xml @@ -0,0 +1,170 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/app/src/main/res/drawable/ic_launcher_foreground.xml b/app/src/main/res/drawable/ic_launcher_foreground.xml new file mode 100644 index 0000000..2b068d1 --- /dev/null +++ b/app/src/main/res/drawable/ic_launcher_foreground.xml @@ -0,0 +1,30 @@ + + + + + + + + + + + \ No newline at end of file diff --git a/app/src/main/res/mipmap-anydpi/ic_launcher.xml b/app/src/main/res/mipmap-anydpi/ic_launcher.xml new file mode 100644 index 0000000..6f3b755 --- /dev/null +++ b/app/src/main/res/mipmap-anydpi/ic_launcher.xml @@ -0,0 +1,6 @@ + + + + + + \ No newline at end of file diff --git a/app/src/main/res/mipmap-anydpi/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi/ic_launcher_round.xml new file mode 100644 index 0000000..6f3b755 --- /dev/null +++ b/app/src/main/res/mipmap-anydpi/ic_launcher_round.xml @@ -0,0 +1,6 @@ + + + + + + \ No 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--git a/app/src/main/res/mipmap-xhdpi/ic_launcher.webp b/app/src/main/res/mipmap-xhdpi/ic_launcher.webp new file mode 100644 index 0000000..948a307 Binary files /dev/null and b/app/src/main/res/mipmap-xhdpi/ic_launcher.webp differ diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp new file mode 100644 index 0000000..1b9a695 Binary files /dev/null and b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp differ diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp b/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp new file mode 100644 index 0000000..28d4b77 Binary files /dev/null and b/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp differ diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp new file mode 100644 index 0000000..9287f50 Binary files /dev/null and b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp differ diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp new file mode 100644 index 0000000..aa7d642 Binary files /dev/null and b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp differ diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp new file mode 100644 index 0000000..9126ae3 Binary files /dev/null and b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp differ diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml new file mode 100644 index 0000000..f8c6127 --- /dev/null +++ b/app/src/main/res/values/colors.xml @@ -0,0 +1,10 @@ + + + #FFBB86FC + #FF6200EE + #FF3700B3 + #FF03DAC5 + #FF018786 + #FF000000 + #FFFFFFFF + \ No newline at end of file diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml new file mode 100644 index 0000000..72990eb --- /dev/null +++ b/app/src/main/res/values/strings.xml @@ -0,0 +1,3 @@ + + Audio data + \ No newline at end of file diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml new file mode 100644 index 0000000..7618eb8 --- /dev/null +++ b/app/src/main/res/values/themes.xml @@ -0,0 +1,5 @@ + + + +