koobas.hobune.stream
How to avoid 'auto audio volume decrease' on iphone?
As gamer, I usually listen to podcast with bluetooth while playing games on my iPhone.
I prefer to set audio volume settings to 20% BGM, 50% SFX volume and device master volumes to best-fit for podcast.
So, I can clearly listen to what podcast saying, but not killing all the moods of game by mute.
I'm disturbed when I found my game(in-dev) automatically cut my podcast volume about half when it launches on my iPhone.
I googled and found someone saying iOS automatically adjust audio to app's audio data to protect ear and to avoid hearing problem for being exposed to loud sound.
So, I tried change all volumes of sound clips, but it doesn't help. And I played some recent games that might be unity-powered, also show same situation, which I didn't see this before. ( Tinker Island, Dungeon Warfare, Build Away! and such.. )
I've been awful experiences with them because I need to change device master volume every time when I turn on and off games, with sudden loud surprises.
As developer, what I want to do is prevent this from my game.
Is there any particular settings to avoid this?
Is this something new bug of latest Unity?
I noticed this 'reduced volume' during 5.4 beta-period(with my in-dev game),
and currently using release version of 5.4.0.3 (no patch applied.) and iPhone 6+ with iOS 9.3.4.
Did someone notice this? Does it bother or not?
I noticed the problem aswell. Very annoying. I'm pretty sure it is a Unity bug. Haven't yet found a way to prevent this, sadly.
At first, I thought It might be UnityAds's movie volume was the main cause of this problem, but my new project (for next prototype idea) without UnityAds also has this problem.
I had this problem, VERY irritating. I fixed it by adding a plugin that swizzles AVAudioSession. Here's my code, I hope it helps.
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <objc/runtime.h>
@interface AudioFix : NSObject
@end
__strong AudioFix *sharedInstance;
@implementation AVAudioSession(AudioFix)
+ (void)load {
sharedInstance = [[self alloc] init];
}
- (BOOL)newsetCategory:(NSString *)category
withOptions:(AVAudioSessionCategoryOptions)options
error:(NSError * _Nullable *)outError {
options = AVAudioSessionCategoryOptionMixWithOthers;
return [self newsetCategory:category withOptions:options error:outError];
}
- (id)init {
if (!(self = [super init])) return nil;
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserverForName:UIApplicationDidFinishLaunchingNotification
object:nil
queue:[NSOperationQueue mainQueue]
usingBlock:^(NSNotification *note) {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
SEL setcategory = @selector(setCategory:withOptions:error:);
SEL newsetcategory = @selector(newsetCategory:withOptions:error:);
Method originalMethod = class_getInstanceMethod([self class], setcategory);
Method extendedMethod = class_getInstanceMethod([self class], newsetcategory);
method_exchangeImplementations(originalMethod, extendedMethod);
});
}];
return self;
}
@end
Thanks for this. It worked for us, but was crashing on iOS 9.3.4, I think because the original AVAudioSession init method wasn't being called. Have added our own solution based on yours as an answer here too.
Based on @lanestp's answer, we were finding iOS 9.3.4 was crashing with this. So we modified it thus and it worked. Thanks
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <objc/runtime.h>
@implementation AVAudioSession(UnityStartupVolumeFix)
- (BOOL)altSetCategory:(NSString *)category withOptions:(AVAudioSessionCategoryOptions)options error:(NSError * _Nullable *)outError
{
options = AVAudioSessionCategoryOptionMixWithOthers;
return [self altSetCategory:category withOptions:options error:outError];
}
+ (void)load
{
AVAudioSession* instance = [AVAudioSession sharedInstance];
static dispatch_once_t avAudioSessionHackOnce;
dispatch_once(&avAudioSessionHackOnce, ^{
SEL setCategorySelector = @selector(setCategory:withOptions:error:);
SEL altSetCategorySelector = @selector(altSetCategory:withOptions:error:);
Method originalMethod = class_getInstanceMethod([instance class], setCategorySelector);
Method extendedMethod = class_getInstanceMethod([instance class], altSetCategorySelector);
method_exchangeImplementations(originalMethod, extendedMethod);
});
}
@end
