VideoItem.kt
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package io.livekit.android.videoencodedecode
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.size
import androidx.compose.material.Icon
import androidx.compose.material.Surface
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.onGloballyPositioned
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.semantics.testTag
import androidx.compose.ui.unit.dp
import androidx.compose.ui.viewinterop.AndroidView
import io.livekit.android.renderer.TextureViewRenderer
import io.livekit.android.room.Room
import io.livekit.android.room.participant.Participant
import io.livekit.android.room.track.RemoteVideoTrack
import io.livekit.android.room.track.Track
import io.livekit.android.room.track.VideoTrack
import io.livekit.android.room.track.video.ComposeVisibility
import io.livekit.android.util.flow
import kotlinx.coroutines.flow.*
/**
* Widget for displaying a VideoTrack. Handles the Compose <-> AndroidView interop needed to use
* [TextureViewRenderer].
*/
@Composable
fun VideoItem(
room: Room,
videoTrack: VideoTrack,
modifier: Modifier = Modifier
) {
val videoSinkVisibility = remember(room, videoTrack) { ComposeVisibility() }
var boundVideoTrack by remember { mutableStateOf<VideoTrack?>(null) }
var videoView: TextureViewRenderer? by remember { mutableStateOf(null) }
var receivedVideoFrames by remember { mutableStateOf(false) }
fun cleanupVideoTrack() {
videoView?.let { boundVideoTrack?.removeRenderer(it) }
boundVideoTrack = null
}
fun setupVideoIfNeeded(videoTrack: VideoTrack, view: TextureViewRenderer) {
if (boundVideoTrack == videoTrack) {
return
}
cleanupVideoTrack()
boundVideoTrack = videoTrack
if (videoTrack is RemoteVideoTrack) {
videoTrack.addRenderer(view, videoSinkVisibility)
} else {
videoTrack.addRenderer(view)
}
}
DisposableEffect(room, videoTrack) {
onDispose {
videoSinkVisibility.onDispose()
cleanupVideoTrack()
}
}
DisposableEffect(currentCompositeKeyHash.toString()) {
onDispose {
videoView?.release()
}
}
Box(
modifier = modifier
) {
AndroidView(
factory = { context ->
TextureViewRenderer(context).apply {
room.initVideoRenderer(this)
setupVideoIfNeeded(videoTrack, this)
this.addFrameListener({
if (!receivedVideoFrames) {
receivedVideoFrames = true
}
}, 0f)
videoView = this
}
},
update = { view ->
setupVideoIfNeeded(videoTrack, view)
},
modifier = Modifier
.fillMaxSize()
.onGloballyPositioned { videoSinkVisibility.onGloballyPositioned(it) },
)
// Frame Indicator
if (receivedVideoFrames) {
val frameIndicatorColor = Color.Green
Surface(
color = frameIndicatorColor,
modifier = Modifier
.size(40.dp)
.semantics { testTag = VIDEO_FRAME_INDICATOR }
) {}
}
}
}
const val VIDEO_FRAME_INDICATOR = "frame_indicator"
/**
* This widget primarily serves as a way to observe changes in [videoTracks].
*/
@Composable
fun VideoItemTrackSelector(
room: Room,
participant: Participant,
modifier: Modifier = Modifier
) {
val subscribedVideoTracksFlow by remember(participant) {
mutableStateOf(
participant::videoTracks.flow
.flatMapLatest { videoTracks ->
combine(
videoTracks.values
.map { trackPublication ->
// Re-emit when track changes
trackPublication::track.flow
.map { trackPublication }
}
) { trackPubs ->
trackPubs.toList().filter { trackPublication -> trackPublication.track != null }
}
}
)
}
val videoTracks by subscribedVideoTracksFlow.collectAsState(initial = emptyList())
val videoTrack = videoTracks.firstOrNull { pub -> pub.source == Track.Source.SCREEN_SHARE }?.track as? VideoTrack
?: videoTracks.firstOrNull { pub -> pub.source == Track.Source.CAMERA }?.track as? VideoTrack
?: videoTracks.firstOrNull()?.track as? VideoTrack
if (videoTrack != null) {
VideoItem(
room = room,
videoTrack = videoTrack,
modifier = modifier
)
} else {
Box(modifier = modifier) {
Icon(
painter = painterResource(id = R.drawable.outline_videocam_off_24),
contentDescription = null,
tint = Color.White,
modifier = Modifier.align(Alignment.Center)
)
}
}
}