CallViewModel.kt
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/*
* Copyright 2024 LiveKit, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.livekit.android.videoencodedecode
import android.app.Application
import android.graphics.Color
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.LiveData
import androidx.lifecycle.viewModelScope
import com.github.ajalt.timberkt.Timber
import io.livekit.android.LiveKit
import io.livekit.android.LiveKitOverrides
import io.livekit.android.RoomOptions
import io.livekit.android.room.Room
import io.livekit.android.room.participant.Participant
import io.livekit.android.room.participant.VideoTrackPublishDefaults
import io.livekit.android.room.track.LocalVideoTrackOptions
import io.livekit.android.room.track.VideoCaptureParameter
import io.livekit.android.util.flow
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.flow.*
import kotlinx.coroutines.launch
import livekit.org.webrtc.EglBase
@OptIn(ExperimentalCoroutinesApi::class)
class CallViewModel(
private val url: String,
private val token: String,
private val useDefaultVideoEncoder: Boolean = false,
private val codecWhiteList: List<String>? = null,
private val showVideo: Boolean,
application: Application,
) : AndroidViewModel(application) {
private val mutableRoom = MutableStateFlow<Room?>(null)
val room: MutableStateFlow<Room?> = mutableRoom
val participants = mutableRoom.flatMapLatest { room ->
if (room != null) {
room::remoteParticipants.flow
.map { remoteParticipants ->
listOf<Participant>(room.localParticipant) +
remoteParticipants
.keys
.sortedBy { it.value }
.mapNotNull { remoteParticipants[it] }
}
} else {
flowOf(emptyList())
}
}
private val mutableError = MutableStateFlow<Throwable?>(null)
val error = mutableError.hide()
init {
viewModelScope.launch {
launch {
error.collect { Timber.e(it) }
}
try {
val videoEncoderFactory = if (useDefaultVideoEncoder || codecWhiteList != null) {
val factory = if (useDefaultVideoEncoder) {
WhitelistDefaultVideoEncoderFactory(
EglBase.create().eglBaseContext,
enableIntelVp8Encoder = true,
enableH264HighProfile = true,
)
} else {
WhitelistSimulcastVideoEncoderFactory(
EglBase.create().eglBaseContext,
enableIntelVp8Encoder = true,
enableH264HighProfile = true,
)
}
factory.apply { codecWhitelist = this@CallViewModel.codecWhiteList }
} else {
null
}
val overrides = LiveKitOverrides(videoEncoderFactory = videoEncoderFactory)
val room = LiveKit.create(
application,
options = RoomOptions(videoTrackPublishDefaults = VideoTrackPublishDefaults(simulcast = !useDefaultVideoEncoder)),
overrides = overrides,
)
room.connect(url, token)
// Create and publish audio/video tracks
val localParticipant = room.localParticipant
if (showVideo) {
val capturer = DummyVideoCapturer(Color.RED)
val videoTrack = localParticipant.createVideoTrack(
capturer = capturer,
options = LocalVideoTrackOptions(captureParams = VideoCaptureParameter(128, 128, 30)),
)
videoTrack.startCapture()
localParticipant.publishVideoTrack(videoTrack)
}
mutableRoom.value = room
} catch (e: Throwable) {
mutableError.value = e
}
}
}
override fun onCleared() {
super.onCleared()
mutableRoom.value?.disconnect()
}
}
private fun <T> LiveData<T>.hide(): LiveData<T> = this
private fun <T> MutableStateFlow<T>.hide(): StateFlow<T> = this
private fun <T> Flow<T>.hide(): Flow<T> = this