Preview video and audio captions while captioning

Extensions/AVAudioSession+Extensions.swift

@@ -0,0 +1,27 @@
+// Copyright © 2021 Metabolist. All rights reserved.
+
+import AVKit
+
+extension AVAudioSession {
+    static func incrementPresentedPlayerViewControllerCount() {
+        presentedPlayerViewControllerCount += 1
+    }
+
+    static func decrementPresentedPlayerViewControllerCount() {
+        presentedPlayerViewControllerCount -= 1
+    }
+}
+
+private extension AVAudioSession {
+    static var presentedPlayerViewControllerCount = 0 {
+        didSet {
+            let instance = sharedInstance()
+
+            if presentedPlayerViewControllerCount > 0, instance.category != .playback {
+                try? instance.setCategory(.playback, mode: .default)
+            } else if instance.category != .ambient {
+                try? instance.setCategory(.ambient, mode: .default)
+            }
+        }
+    }
+}

Metatext.xcodeproj/project.pbxproj

@@ -142,6 +142,8 @@
 		D0B5FE9B251583DB00478838 /* ProfileCollection+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0B5FE9A251583DB00478838 /* ProfileCollection+Extensions.swift */; };
 		D0B8510C25259E56004E0744 /* LoadMoreTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0B8510B25259E56004E0744 /* LoadMoreTableViewCell.swift */; };
 		D0BE633125F2C409001139FA /* CapsuleLabel.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0477F4525C72E50005C5368 /* CapsuleLabel.swift */; };
+		D0BE633725F2D95E001139FA /* AVAudioSession+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0BE633625F2D95E001139FA /* AVAudioSession+Extensions.swift */; };
+		D0BE634025F2DB98001139FA /* AVAudioSession+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0BE633625F2D95E001139FA /* AVAudioSession+Extensions.swift */; };
 		D0BE97A325CF44310057E161 /* CGRect+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0BE97A225CF44310057E161 /* CGRect+Extensions.swift */; };
 		D0BE97D725D0863E0057E161 /* ImagePastableTextView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0BE97D625D0863E0057E161 /* ImagePastableTextView.swift */; };
 		D0BE97E025D086F80057E161 /* ImagePastableTextView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0BE97D625D0863E0057E161 /* ImagePastableTextView.swift */; };
@@ -376,6 +378,7 @@
 		D0B5FE9A251583DB00478838 /* ProfileCollection+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ProfileCollection+Extensions.swift"; sourceTree = "<group>"; };
 		D0B8510B25259E56004E0744 /* LoadMoreTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoadMoreTableViewCell.swift; sourceTree = "<group>"; };
 		D0BDF66524FD7A6400C7FA1C /* ServiceLayer */ = {isa = PBXFileReference; lastKnownFileType = folder; path = ServiceLayer; sourceTree = "<group>"; };
+		D0BE633625F2D95E001139FA /* AVAudioSession+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "AVAudioSession+Extensions.swift"; sourceTree = "<group>"; };
 		D0BE97A225CF44310057E161 /* CGRect+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "CGRect+Extensions.swift"; sourceTree = "<group>"; };
 		D0BE97D625D0863E0057E161 /* ImagePastableTextView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImagePastableTextView.swift; sourceTree = "<group>"; };
 		D0BE980325D229D50057E161 /* SeparatorConfiguredTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SeparatorConfiguredTableViewCell.swift; sourceTree = "<group>"; };
@@ -819,6 +822,7 @@
 			isa = PBXGroup;
 			children = (
 				D00CB22925C92C0F008EF267 /* Attachment+Extensions.swift */,
+				D0BE633625F2D95E001139FA /* AVAudioSession+Extensions.swift */,
 				D05E688425B55AE8001FB2C6 /* AVURLAsset+Extensions.swift */,
 				D0BE97A225CF44310057E161 /* CGRect+Extensions.swift */,
 				D0F0B135251AA12700942152 /* CollectionItem+Extensions.swift */,
@@ -1125,6 +1129,7 @@
 				D0C7D49A24F7616A001EBDBB /* TableView.swift in Sources */,
 				D08B8D622540DE3B00B1EBEF /* ZoomTransitionController.swift in Sources */,
 				D0F0B12E251A97E400942152 /* TableViewController.swift in Sources */,
+				D0BE633725F2D95E001139FA /* AVAudioSession+Extensions.swift in Sources */,
 				D0477F2C25C6EBAD005C5368 /* OpenInDefaultBrowserActivity.swift in Sources */,
 				D07F4D9825D493E300F61133 /* MuteView.swift in Sources */,
 				D02D338D25EDA593000A35CC /* CopyableLabel.swift in Sources */,
@@ -1278,6 +1283,7 @@
 				D05936D025A8D79800754FDF /* EditAttachmentViewController.swift in Sources */,
 				D0CEC10A25E3381500FEF5A6 /* AnimatedTextAttachment.swift in Sources */,
 				D08E52EF257D757100FA2C5F /* CompositionView.swift in Sources */,
+				D0BE634025F2DB98001139FA /* AVAudioSession+Extensions.swift in Sources */,
 				D07EC7FE25B16994006DF726 /* EmojiCategoryHeaderView.swift in Sources */,
 				D0CE9F88258B076900E3A6B6 /* AttachmentUploadView.swift in Sources */,
 				D0CEC11A25E34BFE00FEF5A6 /* AnimatingLayoutManager.swift in Sources */,

View Controllers/EditAttachmentViewController.swift

@@ -1,5 +1,6 @@
 // Copyright © 2021 Metabolist. All rights reserved.
 
+import AVKit
 import Combine
 import UIKit
 import ViewModels
@@ -21,16 +22,47 @@ final class EditAttachmentViewController: UIViewController {
         fatalError("init(coder:) has not been implemented")
     }
 
+    deinit {
+        if let playerViewController =
+            children.first(where: { $0 is AVPlayerViewController }) as? AVPlayerViewController {
+            playerViewController.player?.isMuted = true
+            AVAudioSession.decrementPresentedPlayerViewControllerCount()
+        }
+    }
+
     // swiftlint:disable:next function_body_length
     override func viewDidLoad() {
         super.viewDidLoad()
 
         view.backgroundColor = .systemBackground
 
-        let editThumbnailView = EditThumbnailView(viewModel: viewModel)
+        let trailingView: UIView
 
-        view.addSubview(editThumbnailView)
+        switch viewModel.attachment.type {
-        editThumbnailView.translatesAutoresizingMaskIntoConstraints = false
+        case .image, .gifv:
+            trailingView = EditThumbnailView(viewModel: viewModel)
+            view.addSubview(trailingView)
+        default:
+            let playerViewController = AVPlayerViewController()
+            let player: AVPlayer
+
+            if viewModel.attachment.type == .video {
+                player = PlayerCache.shared.player(url: viewModel.attachment.url)
+            } else {
+                player = AVPlayer(url: viewModel.attachment.url)
+            }
+
+            player.isMuted = false
+            playerViewController.player = player
+
+            trailingView = playerViewController.view
+            addChild(playerViewController)
+            view.addSubview(trailingView)
+            playerViewController.didMove(toParent: self)
+            AVAudioSession.incrementPresentedPlayerViewControllerCount()
+        }
+
+        trailingView.translatesAutoresizingMaskIntoConstraints = false
 
         let stackView = UIStackView()
 
@@ -76,14 +108,14 @@ final class EditAttachmentViewController: UIViewController {
         NSLayoutConstraint.activate([
             stackView.leadingAnchor.constraint(equalTo: view.layoutMarginsGuide.leadingAnchor),
             stackView.topAnchor.constraint(equalTo: view.layoutMarginsGuide.topAnchor, constant: .defaultSpacing),
-            editThumbnailView.leadingAnchor.constraint(equalTo: stackView.trailingAnchor, constant: .defaultSpacing),
+            trailingView.leadingAnchor.constraint(equalTo: stackView.trailingAnchor, constant: .defaultSpacing),
             stackView.bottomAnchor.constraint(
                 equalTo: view.layoutMarginsGuide.bottomAnchor,
                 constant: -.defaultSpacing),
-            editThumbnailView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
+            trailingView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
-            editThumbnailView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
+            trailingView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
-            editThumbnailView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
+            trailingView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
-            editThumbnailView.widthAnchor.constraint(equalTo: stackView.widthAnchor, multiplier: 3 / 2)
+            trailingView.widthAnchor.constraint(equalTo: stackView.widthAnchor, multiplier: 3 / 2)
         ])
 
         viewModel.$descriptionRemainingCharacters

View Controllers/TableViewController.swift

@@ -320,8 +320,8 @@ extension TableViewController: AVPlayerViewControllerDelegate {
     func playerViewController(
         _ playerViewController: AVPlayerViewController,
         willEndFullScreenPresentationWithAnimationCoordinator coordinator: UIViewControllerTransitionCoordinator) {
-        try? AVAudioSession.sharedInstance().setCategory(.ambient, mode: .default)
         playerViewController.player?.isMuted = true
+        AVAudioSession.decrementPresentedPlayerViewControllerCount()
 
         coordinator.animate(alongsideTransition: nil) { _ in
             if self.shouldKeepPlayingVideoAfterDismissal {
@@ -586,7 +586,7 @@ private extension TableViewController {
             shouldKeepPlayingVideoAfterDismissal = attachmentViewModel.shouldAutoplay
 
             present(playerViewController, animated: true) {
-                try? AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
+                AVAudioSession.incrementPresentedPlayerViewControllerCount()
                 player.isMuted = false
                 player.play()
             }