CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- Desktop: audio playback failed with *Failed to play audio* on every record,
+  because the JDK cannot decode the `.m4a` (AAC) recordings on its own.
+
 ## [1.0.0-alpha02] - 2026-08-04
 
 ### Added
@@ -64,7 +69,7 @@ First public release of **Chom Bev e Brezhoneg**.
 - Targets Android, iOS, Desktop (JVM) and Web (JS + Wasm), all sharing the same
   Compose Multiplatform UI. Only Android has been deeply tested for this version.
 - Audio playback backed by ExoPlayer (Android), AVFoundation (iOS), the browser
-  audio APIs (Web).
+  audio APIs (Web) and `javax.sound.sampled` (Desktop).
 - Light and dark themes; interface localised in French and Breton.
 - Modular architecture: `core`, `data` and `feature` modules glued by a thin
   `shared` module, with Koin dependency injection validated at build time.

core/audioplayer/build.gradle.kts

@@ -13,6 +13,10 @@ kotlin {
             implementation(libs.media3.exoplayer)
             implementation(libs.media3.common)
         }
+        jvmMain.dependencies {
+            // Desktop audio: AAC/MP4 SPI so javax.sound.sampled can decode .m4a
+            implementation(libs.jaad)
+        }
         // webMain is the js + wasmJs intermediate source set from the default hierarchy template.
         webMain.dependencies {
             // Browser audio (HTMLAudioElement, document) for js + wasmJs

core/audioplayer/src/jvmMain/kotlin/bzh/ajaury/chombev/player/data/JvmAudioPlayer.kt

@@ -17,6 +17,10 @@ import kotlin.time.Duration.Companion.microseconds
 
 /**
  * Desktop [AudioPlayer] backed by [javax.sound.sampled].
+ *
+ * The JDK decodes neither AAC nor its MP4 container, so the `.m4a` recordings are decoded to PCM by
+ * the jaad AAC provider on the classpath, which [AudioSystem] discovers automatically. Loading then
+ * works the same as for any natively supported format.
  */
 internal class JvmAudioPlayer : AudioPlayer {
     private var clip: Clip? = null

gradle/libs.versions.toml

@@ -10,6 +10,7 @@ composeIconsExtended = "1.7.3"
 composeMultiplatform = "1.11.1"
 datastore = "1.2.1" # https://developer.android.com/jetpack/androidx/releases/datastore
 googleServices = "4.5.0"
+jaad = "0.9.4"
 kermit = "2.1.0"
 koin = "4.2.2"
 kotlin = "2.4.10"
@@ -43,6 +44,7 @@ compose-runtime = { module = "org.jetbrains.compose.runtime:runtime", version.re
 compose-ui = { module = "org.jetbrains.compose.ui:ui", version.ref = "composeMultiplatform" }
 compose-uiTooling = { module = "org.jetbrains.compose.ui:ui-tooling", version.ref = "composeMultiplatform" }
 compose-uiToolingPreview = { module = "org.jetbrains.compose.ui:ui-tooling-preview", version.ref = "composeMultiplatform" }
+jaad = { module = "com.tianscar.javasound:jaad", version.ref = "jaad" }
 koin-bom = { module = "io.insert-koin:koin-bom", version.ref = "koin" }
 koin-compose = { module = "io.insert-koin:koin-compose" }
 koin-compose-viewmodel = { module = "io.insert-koin:koin-compose-viewmodel" }