have users be response for creating and publishing tracks

+<component name="ProjectDictionaryState">
+  <dictionary name="davidliu">
+    <words>
+      <w>capturer</w>
+    </words>
+  </dictionary>
+</component>
\ No newline at end of file

@@ -2,6 +2,5 @@ package io.livekit.android
 
 
 data class ConnectOptions(
-    val sendAudio: Boolean = true,
-    val sendVideo: Boolean = true,
+    val placeholder: Unit = Unit
 )
\ No newline at end of file

@@ -4,11 +4,6 @@ import android.content.Context
 import io.livekit.android.dagger.DaggerLiveKitComponent
 import io.livekit.android.room.Room
 import io.livekit.android.room.RoomListener
-import io.livekit.android.room.track.LocalAudioTrack
-import io.livekit.android.room.track.LocalVideoTrack
-import org.webrtc.EglBase
-import org.webrtc.MediaConstraints
-import org.webrtc.PeerConnectionFactory
 
 class LiveKit {
     companion object {
@@ -27,51 +22,15 @@ class LiveKit {
 
             val component = DaggerLiveKitComponent
                 .factory()
-                .create(appContext)
+                .create(appContext.applicationContext)
 
             val room = component.roomFactory()
                 .create(options)
             room.listener = listener
             room.connect(url, token)
 
-            val localParticipant = room.localParticipant
-            if (localParticipant != null) {
-                val factory = component.peerConnectionFactory()
-                if (options.sendAudio) {
-                    val audioTrack = createLocalAudioTrack(factory)
-                    localParticipant.publishAudioTrack(audioTrack)
-                    audioTrack.enabled = true
-                }
-                if (options.sendVideo) {
-                    val videoTrack = createLocalVideoTrack(
-                        factory,
-                        appContext,
-                        component.eglBase()
-                    )
-                    localParticipant.publishVideoTrack(videoTrack)
-                    videoTrack.startCapture()
-                }
-            }
             return room
         }
 
-        private fun createLocalVideoTrack(
-            peerConnectionFactory: PeerConnectionFactory,
-            context: Context,
-            rootEglBase: EglBase,
-        ): LocalVideoTrack {
-            return LocalVideoTrack.createTrack(
-                peerConnectionFactory,
-                context,
-                true,
-                "LiveKit Video",
-                rootEglBase
-            )
-        }
-
-        private fun createLocalAudioTrack(factory: PeerConnectionFactory): LocalAudioTrack {
-            val audioConstraints = MediaConstraints()
-            return LocalAudioTrack.createTrack(factory, audioConstraints)
-        }
     }
 }

@@ -77,11 +77,6 @@ class RTCModule {
             }
 
             return JavaAudioDeviceModule.builder(appContext)
-                .setSamplesReadyCallback(object : JavaAudioDeviceModule.SamplesReadyCallback {
-                    override fun onWebRtcAudioRecordSamplesReady(samples: JavaAudioDeviceModule.AudioSamples?) {
-                        Timber.v { "samples: $samples" }
-                    }
-                })
                 .setUseHardwareAcousticEchoCanceler(true)
                 .setUseHardwareNoiseSuppressor(true)
                 .setAudioRecordErrorCallback(audioRecordErrorCallback)

 package io.livekit.android.room
 
-import android.content.Context
 import com.github.ajalt.timberkt.Timber
 import io.livekit.android.dagger.InjectionNames
-import io.livekit.android.room.track.Track
 import io.livekit.android.room.track.TrackException
 import io.livekit.android.room.util.*
 import io.livekit.android.util.CloseableCoroutineScope
@@ -16,6 +14,7 @@ import livekit.LivekitRtc
 import org.webrtc.*
 import javax.inject.Inject
 import javax.inject.Named
+import javax.inject.Singleton
 import kotlin.coroutines.Continuation
 import kotlin.coroutines.resume
 import kotlin.coroutines.suspendCoroutine
@@ -23,6 +22,7 @@ import kotlin.coroutines.suspendCoroutine
 /**
  * @suppress
  */
+@Singleton
 class RTCEngine
 @Inject
 constructor(

@@ -27,6 +27,7 @@ constructor(
     @Assisted private val connectOptions: ConnectOptions,
     private val engine: RTCEngine,
     private val eglBase: EglBase,
+    private val localParticipantFactory: LocalParticipant.Factory
 ) : RTCEngine.Listener, ParticipantListener {
     init {
         engine.listener = this
@@ -162,7 +163,7 @@ constructor(
             return
         }
 
-        val lp = LocalParticipant(response.participant, engine)
+        val lp = localParticipantFactory.create(response.participant)
         lp.listener = this
         localParticipant = lp
         if (response.otherParticipantsList.isNotEmpty()) {

 package io.livekit.android.room.participant
 
+import android.content.Context
 import com.github.ajalt.timberkt.Timber
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedFactory
+import dagger.assisted.AssistedInject
 import io.livekit.android.room.RTCEngine
 import io.livekit.android.room.track.*
 import livekit.LivekitModels
-import org.webrtc.DataChannel
-import org.webrtc.RtpTransceiver
-import java.util.*
-
-class LocalParticipant(info: LivekitModels.ParticipantInfo, private val engine: RTCEngine) :
+import org.webrtc.*
+
+class LocalParticipant
+@AssistedInject
+internal constructor(
+    @Assisted
+    info: LivekitModels.ParticipantInfo,
+    private val engine: RTCEngine,
+    private val peerConnectionFactory: PeerConnectionFactory,
+    private val context: Context,
+    private val eglBase: EglBase,
+) :
     Participant(info.sid, info.identity) {
 
     init {
@@ -18,6 +29,24 @@ class LocalParticipant(info: LivekitModels.ParticipantInfo, private val engine:
     private val localTrackPublications
         get() = tracks.values.toList()
 
+    fun createAudioTrack(
+        audioConstraints: MediaConstraints = MediaConstraints(),
+        name: String = ""
+    ) = LocalAudioTrack.createTrack(peerConnectionFactory, audioConstraints, name)
+
+    fun createVideoTrack(
+        isScreencast: Boolean = false,
+        name: String = "",
+    ): LocalVideoTrack {
+        return LocalVideoTrack.createTrack(
+            peerConnectionFactory,
+            context,
+            isScreencast,
+            name,
+            eglBase
+        )
+    }
+
     suspend fun publishAudioTrack(
         track: LocalAudioTrack,
         publishListener: PublishListener? = null
@@ -147,4 +176,9 @@ class LocalParticipant(info: LivekitModels.ParticipantInfo, private val engine:
         fun onPublishSuccess(publication: TrackPublication) {}
         fun onPublishFailure(exception: Exception) {}
     }
+
+    @AssistedFactory
+    interface Factory {
+        fun create(info: LivekitModels.ParticipantInfo): LocalParticipant
+    }
 }

@@ -4,6 +4,11 @@ import org.webrtc.MediaConstraints
 import org.webrtc.PeerConnectionFactory
 import java.util.*
 
+/**
+ * Represents a local audio track (generally using the microphone as input).
+ *
+ * This class should not be constructed directly, but rather through [LocalParticipant]
+ */
 class LocalAudioTrack(
     name: String,
     audioOptions: AudioOptions? = null,
@@ -19,9 +24,9 @@ class LocalAudioTrack(
         private set
 
     companion object {
-        fun createTrack(
+        internal fun createTrack(
             factory: PeerConnectionFactory,
-            audioConstraints: MediaConstraints,
+            audioConstraints: MediaConstraints = MediaConstraints(),
             name: String = ""
         ): LocalAudioTrack {
 

@@ -5,7 +5,11 @@ import com.github.ajalt.timberkt.Timber
 import org.webrtc.*
 import java.util.*
 
-
+/**
+ * A representation of a local video track (generally input coming from camera or screen).
+ *
+ * [startCapture] should be called before use.
+ */
 class LocalVideoTrack(
     private val capturer: VideoCapturer,
     private val source: VideoSource,
@@ -20,19 +24,18 @@ class LocalVideoTrack(
         internal fun createTrack(
             peerConnectionFactory: PeerConnectionFactory,
             context: Context,
-            enabled: Boolean,
+            isScreencast: Boolean,
             name: String,
             rootEglBase: EglBase,
         ): LocalVideoTrack {
-            val source = peerConnectionFactory.createVideoSource(false)
+            val source = peerConnectionFactory.createVideoSource(isScreencast)
             val capturer = createVideoCapturer(context) ?: TODO()
             capturer.initialize(
-                SurfaceTextureHelper.create("CaptureThread", rootEglBase.eglBaseContext),
+                SurfaceTextureHelper.create("VideoCaptureThread", rootEglBase.eglBaseContext),
                 context,
                 source.capturerObserver
             )
             val track = peerConnectionFactory.createVideoTrack(UUID.randomUUID().toString(), source)
-            track.setEnabled(enabled)
 
             return LocalVideoTrack(
                 capturer = capturer,

@@ -30,9 +30,17 @@ class CallViewModel(
                 application,
                 url,
                 token,
-                ConnectOptions(true),
+                ConnectOptions(),
                 this@CallViewModel
             )
+
+            val localParticipant = room.localParticipant
+            val audioTrack = localParticipant.createAudioTrack()
+            localParticipant.publishAudioTrack(audioTrack)
+            val videoTrack = localParticipant.createVideoTrack()
+            localParticipant.publishVideoTrack(videoTrack)
+            videoTrack.startCapture()
+
             updateParticipants(room)
             mutableRoom.value = room
         }
@@ -50,7 +58,6 @@ class CallViewModel(
     override fun onCleared() {
         super.onCleared()
         mutableRoom.value?.disconnect()
-        mutableRoom.value = null
     }
 
     override fun onDisconnect(room: Room, error: Exception?) {

@@ -20,9 +20,8 @@
     <org.webrtc.SurfaceViewRenderer
         android:id="@+id/pip_video_view"
         android:layout_height="144dp"
-        android:layout_width="0dp"
+        android:layout_width="144dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
         android:layout_margin="16dp" />
 </androidx.constraintlayout.widget.ConstraintLayout>