musikr: init rust metadata jni library

build.gradle

@@ -33,6 +33,7 @@ plugins {
     id "com.google.devtools.ksp" version '2.0.21-1.0.25' apply false
     // We use spotless in the root build.gradle to apply to all modules.
     id "com.diffplug.spotless" version "6.25.0" apply true
+    id "org.mozilla.rust-android-gradle.rust-android" version "0.9.6" apply false
 }
 
 spotless {

musikr/build.gradle

@@ -7,6 +7,7 @@ plugins {
     id "com.diffplug.spotless"
     id "kotlin-parcelize"
     id "org.jetbrains.dokka"
+    id "org.mozilla.rust-android-gradle.rust-android"
 }
 
 android {
@@ -20,11 +21,6 @@ android {
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         consumerProguardFiles "consumer-rules.pro"
-        externalNativeBuild {
-            cmake {
-                cppFlags ""
-            }
-        }
     }
 
     buildTypes {
@@ -34,13 +30,6 @@ android {
         }
     }
 
-    externalNativeBuild {
-        cmake {
-            path "src/main/cpp/CMakeLists.txt"
-            version "3.22.1"
-        }
-    }
-
     compileOptions {
         coreLibraryDesugaringEnabled true
         sourceCompatibility JavaVersion.VERSION_17
@@ -57,6 +46,14 @@ android {
     }
 }
 
+cargo {
+    module  = "./src/main/jni"
+    libname = "metadatajni"
+    targets = ["arm", "arm64", "x86", "x86_64"]
+    prebuiltToolchains = true
+    profile = 'debug'
+}
+
 dependencies {
     // Kotlin
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"

musikr/src/main/java/org/oxycblt/musikr/metadata/MetadataExtractor.kt

@@ -19,6 +19,7 @@
 package org.oxycblt.musikr.metadata
 
 import android.os.ParcelFileDescriptor
+import android.util.Log
 import java.io.FileInputStream
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
@@ -36,6 +37,8 @@ private object MetadataExtractorImpl : MetadataExtractor {
     override suspend fun extract(deviceFile: DeviceFile, fd: ParcelFileDescriptor) =
         withContext(Dispatchers.IO) {
             val fis = FileInputStream(fd.fileDescriptor)
-            TagLibJNI.open(deviceFile, fis).also { fis.close() }
+            Log.d("MetadataExtractorImpl", MetadataJNI.rust("bruh"))
+//            MetadataJNI.open(deviceFile, fis).also { fis.close() }
+                null
         }
 }

musikr/src/main/java/org/oxycblt/musikr/metadata/MetadataJNI.kt

@@ -18,25 +18,12 @@
  
 package org.oxycblt.musikr.metadata
 
-import java.io.FileInputStream
+internal object MetadataJNI {
-import org.oxycblt.musikr.fs.DeviceFile
-
-internal object TagLibJNI {
     init {
-        System.loadLibrary("tagJNI")
+        System.loadLibrary("metadatajni")
     }
 
-    /**
+    // This is a rust function, Android Studio has no idea how to link to it
-     * Open a file and extract a tag.
+    @Suppress("KotlinJniMissingFunction")
-     *
+    external fun rust(a: String): String
-     * Note: This method is blocking and should be handled as such if calling from a coroutine.
-     */
-    fun open(deviceFile: DeviceFile, fis: FileInputStream): Metadata? {
-        val inputStream = NativeInputStream(deviceFile, fis)
-        val tag = openNative(inputStream)
-        inputStream.close()
-        return tag
-    }
-
-    private external fun openNative(inputStream: NativeInputStream): Metadata?
 }

musikr/src/main/jni/.gitignore

@@ -0,0 +1 @@
+target/

musikr/src/main/jni/Cargo.lock

@@ -0,0 +1,294 @@
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+# It is not intended for manual editing.
+version = 4
+
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+
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musikr/src/main/jni/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "metadatajni"
+version = "1.0.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+name = "metadatajni"
+
+[dependencies]
+jni = "0.21.1"

musikr/src/main/jni/src/lib.rs

@@ -0,0 +1,22 @@
+use jni::objects::{JClass, JString};
+use jni::sys::jstring;
+use jni::JNIEnv;
+
+#[no_mangle]
+pub extern "C" fn Java_org_oxycblt_musikr_metadata_MetadataJNI_rust(
+    mut env: JNIEnv,
+    _class: JClass,
+    input: JString,
+) -> jstring {
+    // Convert the Java string (JString) to a Rust string
+    let input: String = env.get_string(&input).expect("Couldn't get java string!").into();
+
+    // Process the input string (this is where your Rust logic would go)
+    let output = format!("Hello from Rust, {}", input);
+
+    // Convert the Rust string back to a Java string (jstring)
+    let output = env.new_string(output).expect("Couldn't create java string!");
+
+    // Return the Java string
+    output.into_raw()
+}