fix(demos): camera: do not release streamer in the lifecycle observer…

…. Only the view model `onCleared` call release as streamer is persisted throught application lifecycle.

core/src/main/java/io/github/thibaultbee/streampack/core/streamers/observers/StreamerLifeCycleObserver.kt

@@ -32,7 +32,8 @@ import kotlinx.coroutines.runBlocking
  *
  *  @param streamer The streamer to observe
  */
-open class StreamerLifeCycleObserver(val streamer: ICoroutineStreamer) : DefaultLifecycleObserver {
+open class StreamerLifeCycleObserver(protected val streamer: ICoroutineStreamer) :
+    DefaultLifecycleObserver {
     override fun onPause(owner: LifecycleOwner) {
         if (streamer is ICameraStreamer) {
             streamer.stopPreview()

demos/camera/src/main/java/io/github/thibaultbee/streampack/app/utils/StreamerManager.kt

@@ -21,6 +21,7 @@ import android.net.Uri
 import android.os.Build
 import android.util.Range
 import androidx.annotation.RequiresPermission
+import androidx.lifecycle.LifecycleOwner
 import io.github.thibaultbee.streampack.app.configuration.Configuration
 import io.github.thibaultbee.streampack.app.models.EndpointType
 import io.github.thibaultbee.streampack.app.models.FileExtension
@@ -61,7 +62,7 @@ class StreamerManager(
         get() = (streamer as ICameraStreamer?)?.videoSource?.cameraId
 
     val streamerLifeCycleObserver: StreamerLifeCycleObserver by lazy {
-        StreamerLifeCycleObserver(streamer)
+        CustomStreamerLifeCycleObserver(streamer)
     }
 
     val requiredPermissions: List<String>
@@ -242,4 +243,12 @@ class StreamerManager(
         set(value) {
             streamer.audioSource?.isMuted = value
         }
+
+    class CustomStreamerLifeCycleObserver(streamer: ICoroutineStreamer) :
+        StreamerLifeCycleObserver(streamer) {
+        override fun onDestroy(owner: LifecycleOwner) {
+            // Do nothing
+            // The ViewModel onCleared() method will call release() method
+        }
+    }
 }