Voice Broadcast - Get voice messages events related to a given VB

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/timeline/TimelineService.kt

@@ -55,4 +55,9 @@ interface TimelineService {
      * Returns a snapshot list of TimelineEvent with EventType.MESSAGE and MessageType.MSGTYPE_IMAGE or MessageType.MSGTYPE_VIDEO.
      */
     fun getAttachmentMessages(): List<TimelineEvent>
+
+    /**
+     * Returns a snapshot list of TimelineEvent with a content relation of the given type to the given eventId.
+     */
+    fun getTimelineEventsRelatedTo(relationType: String, eventId: String): List<TimelineEvent>
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimelineService.kt

@@ -96,4 +96,8 @@ internal class DefaultTimelineService @AssistedInject constructor(
     override fun getAttachmentMessages(): List<TimelineEvent> {
         return timelineEventDataSource.getAttachmentMessages(roomId)
     }
+
+    override fun getTimelineEventsRelatedTo(relationType: String, eventId: String): List<TimelineEvent> {
+        return timelineEventDataSource.getTimelineEventsRelatedTo(roomId, relationType, eventId)
+    }
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/TimelineEventDataSource.kt

@@ -19,6 +19,7 @@ package org.matrix.android.sdk.internal.session.room.timeline
 import androidx.lifecycle.LiveData
 import com.zhuinden.monarchy.Monarchy
 import io.realm.Sort
+import org.matrix.android.sdk.api.session.events.model.getRelationContent
 import org.matrix.android.sdk.api.session.events.model.isImageMessage
 import org.matrix.android.sdk.api.session.events.model.isVideoMessage
 import org.matrix.android.sdk.api.session.room.timeline.TimelineEvent
@@ -63,4 +64,18 @@ internal class TimelineEventDataSource @Inject constructor(
                     .orEmpty()
         }
     }
+
+    fun getTimelineEventsRelatedTo(roomId: String, eventType: String, eventId: String): List<TimelineEvent> {
+        // TODO Remove this trick and call relations API
+        // see https://spec.matrix.org/latest/client-server-api/#get_matrixclientv1roomsroomidrelationseventidreltypeeventtype
+        return realmSessionProvider.withRealm { realm ->
+            TimelineEventEntity.whereRoomId(realm, roomId)
+                    .sort(TimelineEventEntityFields.ROOT.ORIGIN_SERVER_TS, Sort.ASCENDING)
+                    .distinct(TimelineEventEntityFields.EVENT_ID)
+                    .findAll()
+                    .mapNotNull {
+                        timelineEventMapper.map(it).takeIf { it.root.getRelationContent()?.takeIf { it.type == eventType && it.eventId == eventId } != null }
+                    }
+        }
+    }
 }

vector/src/main/java/im/vector/app/features/voicebroadcast/VoiceBroadcastPlayer.kt

@@ -26,11 +26,13 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import org.matrix.android.sdk.api.extensions.orFalse
 import org.matrix.android.sdk.api.session.Session
+import org.matrix.android.sdk.api.session.events.model.RelationType
 import org.matrix.android.sdk.api.session.events.model.getRelationContent
 import org.matrix.android.sdk.api.session.getRoom
 import org.matrix.android.sdk.api.session.room.Room
 import org.matrix.android.sdk.api.session.room.model.message.MessageAudioContent
 import org.matrix.android.sdk.api.session.room.model.message.MessageAudioEvent
+import org.matrix.android.sdk.api.session.room.model.message.asMessageAudioEvent
 import timber.log.Timber
 import javax.inject.Inject
 import javax.inject.Singleton
@@ -80,9 +82,10 @@ class VoiceBroadcastPlayer @Inject constructor(
         currentPlayingIndex = -1
     }
 
-    @Suppress("UNUSED_PARAMETER")
     private fun updatePlaylist(room: Room, eventId: String) {
-        // TODO get the list of voice messages
+        val timelineEvents = room.timelineService().getTimelineEventsRelatedTo(RelationType.REFERENCE, eventId)
+        val audioEvents = timelineEvents.mapNotNull { it.root.asMessageAudioEvent() }
+        playlist = audioEvents.sortedBy { it.root.originServerTs }
     }
 
     private fun startPlayback() {