129 lines
5.4 KiB
Plaintext
129 lines
5.4 KiB
Plaintext
#import <Foundation/Foundation.h>
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#import <AVFoundation/AVFoundation.h>
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static void (*gSuspendCallback)(bool suspend) = nullptr;
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static bool gIsSuspended = false;
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static bool gNeedsReset = false;
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extern "C" void RegisterSuspendCallback(void (*callback)(bool))
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{
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if (gSuspendCallback || !callback)
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{
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return;
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}
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gSuspendCallback = callback;
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[[NSNotificationCenter defaultCenter] addObserverForName:AVAudioSessionInterruptionNotification object:nil queue:nil usingBlock:^(NSNotification *notification)
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{
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AVAudioSessionInterruptionType type = (AVAudioSessionInterruptionType)[[notification.userInfo valueForKey:AVAudioSessionInterruptionTypeKey] unsignedIntegerValue];
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if (type == AVAudioSessionInterruptionTypeBegan)
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{
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NSLog(@"Interruption Began");
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// Ignore deprecated warnings regarding AVAudioSessionInterruptionReasonAppWasSuspended and
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// AVAudioSessionInterruptionWasSuspendedKey, we protect usage for the versions where they are available
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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// If the audio session was deactivated while the app was in the background, the app receives the
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// notification when relaunched. Identify this reason for interruption and ignore it.
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if (@available(iOS 16.0, tvOS 14.5, *))
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{
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// Delayed suspend-in-background notifications no longer exist, this must be a real interruption
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}
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#if !TARGET_OS_TV // tvOS never supported "AVAudioSessionInterruptionReasonAppWasSuspended"
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else if (@available(iOS 14.5, *))
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{
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if ([[notification.userInfo valueForKey:AVAudioSessionInterruptionReasonKey] intValue] == AVAudioSessionInterruptionReasonAppWasSuspended)
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{
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return; // Ignore delayed suspend-in-background notification
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}
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}
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#endif
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else
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{
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if ([[notification.userInfo valueForKey:AVAudioSessionInterruptionWasSuspendedKey] boolValue])
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{
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return; // Ignore delayed suspend-in-background notification
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}
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}
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gSuspendCallback(true);
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gIsSuspended = true;
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#pragma clang diagnostic pop
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}
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else if (type == AVAudioSessionInterruptionTypeEnded)
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{
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NSLog(@"Interruption Ended");
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NSError *errorMessage = nullptr;
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if (![[AVAudioSession sharedInstance] setActive:TRUE error:&errorMessage])
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{
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// Interruption like Siri can prevent session activation, wait for did-become-active notification
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NSLog(@"AVAudioSessionInterruptionNotification: AVAudioSession.setActive() failed: %@", errorMessage);
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return;
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}
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gSuspendCallback(false);
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gIsSuspended = false;
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}
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}];
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[[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationDidBecomeActiveNotification object:nil queue:nil usingBlock:^(NSNotification *notification)
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{
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// Unity video playback prior to 2022.3 on tvOS breaks FMOD audio, so force a reset
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#if TARGET_OS_TV && !UNITY_2022_3_OR_NEWER
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gNeedsReset = true;
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#endif
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if (gNeedsReset)
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{
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gSuspendCallback(true);
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gIsSuspended = true;
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}
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NSError *errorMessage = nullptr;
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if (![[AVAudioSession sharedInstance] setActive:TRUE error:&errorMessage])
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{
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if ([errorMessage code] == AVAudioSessionErrorCodeCannotStartPlaying)
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{
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// Interruption like Screen Time can prevent session activation, but will not trigger an interruption-ended notification.
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// There is no other callback or trigger to hook into after this point, we are not in the background and there is no other audio playing.
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// Our only option is to have a sleep loop until the Audio Session can be activated again.
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while (![[AVAudioSession sharedInstance] setActive:TRUE error:nil])
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{
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usleep(20000);
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}
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}
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else
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{
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// Interruption like Siri can prevent session activation, wait for interruption-ended notification.
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NSLog(@"UIApplicationDidBecomeActiveNotification: AVAudioSession.setActive() failed: %@", errorMessage);
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return;
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}
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}
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// It's possible the system missed sending us an interruption end, so recover here
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if (gIsSuspended)
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{
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gSuspendCallback(false);
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gNeedsReset = false;
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gIsSuspended = false;
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}
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}];
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[[NSNotificationCenter defaultCenter] addObserverForName:AVAudioSessionMediaServicesWereResetNotification object:nil queue:nil usingBlock:^(NSNotification *notification)
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{
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if ([UIApplication sharedApplication].applicationState == UIApplicationStateBackground || gIsSuspended)
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{
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// Received the reset notification while in the background, need to reset the AudioUnit when we come back to foreground.
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gNeedsReset = true;
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}
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else
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{
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// In the foregound but something chopped the media services, need to do a reset.
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gSuspendCallback(true);
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gSuspendCallback(false);
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}
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}];
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}
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