CameraXHelper.kt
4.0 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
/*
* Copyright 2023-2025 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.camera.core.UseCase
import androidx.lifecycle.Lifecycle
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 {
/**
* Creates a CameraProvider that uses CameraX for its sessions.
*
* For use with [CameraCapturerUtils.registerCameraProvider].
* Remember to unregister the provider when outside the lifecycle
* of [lifecycleOwner].
*
* @param lifecycleOwner The lifecycleOwner which controls the lifecycle transitions of the use cases.
* @param useCases The use cases to bind to a lifecycle.
*/
@JvmOverloads
@ExperimentalCamera2Interop
fun createCameraProvider(
lifecycleOwner: LifecycleOwner,
useCases: Array<out UseCase> = emptyArray(),
) = object : CameraCapturerUtils.CameraProvider {
private var enumerator: CameraXEnumerator? = null
override val cameraVersion = 3
override fun provideEnumerator(context: Context): CameraXEnumerator =
enumerator ?: CameraXEnumerator(context, lifecycleOwner, useCases).also {
enumerator = it
}
override fun provideCapturer(
context: Context,
options: LocalVideoTrackOptions,
eventsHandler: CameraEventsDispatchHandler,
): VideoCapturer {
val enumerator = provideEnumerator(context)
val cameraManager = context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
val targetDevice = enumerator.findCamera(options.deviceId, options.position)
val targetDeviceId = targetDevice?.deviceId
val targetVideoCapturer = enumerator.createCapturer(targetDeviceId, eventsHandler) as CameraXCapturer
return CameraXCapturerWithSize(
targetVideoCapturer,
cameraManager,
targetDeviceId,
eventsHandler,
)
}
override fun isSupported(context: Context): Boolean {
return Camera2Enumerator.isSupported(context) && lifecycleOwner.lifecycle.currentState.isAtLeast(Lifecycle.State.INITIALIZED)
}
}
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)
}
}
}