1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package com.google.jetpackcamera.core.camera
17
18 import android.annotation.SuppressLint
19 import androidx.camera.core.Camera
20 import androidx.camera.core.CameraSelector
21 import androidx.camera.core.CompositionSettings
22 import androidx.camera.core.ConcurrentCamera
23 import androidx.camera.core.ConcurrentCamera.SingleCameraConfig
24 import androidx.camera.core.UseCaseGroup
25 import androidx.camera.lifecycle.ProcessCameraProvider
26 import androidx.lifecycle.Lifecycle
27 import androidx.lifecycle.LifecycleOwner
28 import androidx.lifecycle.LifecycleRegistry
29 import kotlin.coroutines.CoroutineContext
30 import kotlinx.coroutines.CoroutineScope
31 import kotlinx.coroutines.Job
32 import kotlinx.coroutines.coroutineScope
33
34 /**
35 * Runs a camera for the duration of a coroutine.
36 *
37 * The camera selected by [cameraSelector] will run with the provided [useCases] for the
38 * duration that [block] is active. This means that [block] should suspend until the camera
39 * should be closed.
40 */
runWithnull41 suspend fun <R> ProcessCameraProvider.runWith(
42 cameraSelector: CameraSelector,
43 useCases: UseCaseGroup,
44 block: suspend CoroutineScope.(Camera) -> R
45 ): R = coroutineScope {
46 val scopedLifecycle = CoroutineLifecycleOwner(coroutineContext)
47 block(this@runWith.bindToLifecycle(scopedLifecycle, cameraSelector, useCases))
48 }
49
50 @SuppressLint("RestrictedApi")
runWithConcurrentnull51 suspend fun <R> ProcessCameraProvider.runWithConcurrent(
52 cameraConfigs: List<Pair<CameraSelector, CompositionSettings>>,
53 useCaseGroup: UseCaseGroup,
54 block: suspend CoroutineScope.(ConcurrentCamera) -> R
55 ): R = coroutineScope {
56 val scopedLifecycle = CoroutineLifecycleOwner(coroutineContext)
57 val singleCameraConfigs = cameraConfigs.map {
58 SingleCameraConfig(it.first, useCaseGroup, it.second, scopedLifecycle)
59 }
60 block(this@runWithConcurrent.bindToLifecycle(singleCameraConfigs))
61 }
62
63 /**
64 * A [LifecycleOwner] that follows the lifecycle of a coroutine.
65 *
66 * If the coroutine is active, the owned lifecycle will jump to a
67 * [Lifecycle.State.RESUMED] state. When the coroutine completes, the owned lifecycle will
68 * transition to a [Lifecycle.State.DESTROYED] state.
69 */
70 private class CoroutineLifecycleOwner(coroutineContext: CoroutineContext) :
71 LifecycleOwner {
72 private val lifecycleRegistry: LifecycleRegistry =
<lambda>null73 LifecycleRegistry(this).apply {
74 currentState = Lifecycle.State.INITIALIZED
75 }
76
77 override val lifecycle: Lifecycle
78 get() = lifecycleRegistry
79
80 init {
81 if (coroutineContext[Job]?.isActive == true) {
82 lifecycleRegistry.currentState = Lifecycle.State.RESUMED
<lambda>null83 coroutineContext[Job]?.invokeOnCompletion {
84 lifecycleRegistry.apply {
85 currentState = Lifecycle.State.STARTED
86 currentState = Lifecycle.State.CREATED
87 currentState = Lifecycle.State.DESTROYED
88 }
89 }
90 } else {
91 lifecycleRegistry.currentState = Lifecycle.State.DESTROYED
92 }
93 }
94 }
95