CameraXHelper.kt
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/*
* Copyright 2023-2024 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 livekit.org.webrtc
import android.content.Context
import android.hardware.camera2.CameraManager
import androidx.camera.camera2.interop.ExperimentalCamera2Interop
import androidx.lifecycle.LifecycleOwner
import io.livekit.android.room.track.LocalVideoTrackOptions
import io.livekit.android.room.track.video.CameraCapturerUtils
import io.livekit.android.room.track.video.CameraCapturerUtils.findCamera
import io.livekit.android.room.track.video.CameraEventsDispatchHandler
class CameraXHelper {
companion object {
@ExperimentalCamera2Interop
fun getCameraProvider(
lifecycleOwner: LifecycleOwner,
controlListener: CameraXSession.CameraControlListener?,
) = object : CameraCapturerUtils.CameraProvider {
private var enumerator: CameraXEnumerator? = null
override val cameraVersion = 3
override fun provideEnumerator(context: Context): CameraXEnumerator =
enumerator ?: CameraXEnumerator(context, lifecycleOwner).also {
enumerator = it
}
override fun provideCapturer(
context: Context,
options: LocalVideoTrackOptions,
eventsHandler: CameraEventsDispatchHandler,
): VideoCapturer {
val enumerator = provideEnumerator(context)
val targetDeviceName = enumerator.findCamera(options.deviceId, options.position)
val targetVideoCapturer = enumerator.createCapturer(targetDeviceName, eventsHandler) as CameraXCapturer
controlListener?.let {
targetVideoCapturer.cameraControlListener = it
}
return CameraXCapturerWithSize(
targetVideoCapturer,
context.getSystemService(Context.CAMERA_SERVICE) as CameraManager,
targetDeviceName,
eventsHandler,
)
}
override fun isSupported(context: Context) = Camera2Enumerator.isSupported(context)
}
private fun getSupportedFormats(
cameraManager: CameraManager,
cameraId: String?,
): List<CameraEnumerationAndroid.CaptureFormat>? =
Camera2Enumerator.getSupportedFormats(cameraManager, cameraId)
fun findClosestCaptureFormat(
cameraManager: CameraManager,
cameraId: String?,
width: Int,
height: Int,
): Size {
val sizes = getSupportedFormats(cameraManager, cameraId)
?.map { Size(it.width, it.height) }
?: emptyList()
return CameraEnumerationAndroid.getClosestSupportedSize(sizes, width, height)
}
}
}