我试图通过 AVFoundation captureStillImageAsynchronouslyFromConnection在相机的实时预览期间捕获图像。到目前为止,该程序按预期工作。但是,如何使快门声音静音?
我曾经使用此代码来捕获 iOS 默认快门声音(这里是声音文件名列表https://github.com/TUNER88/iOSSystemSoundsLibrary):
NSString *path = @"/System/Library/Audio/UISounds/photoShutter.caf"; NSString *docs = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; NSData *data = [NSData dataWithContentsOfFile:path]; [data writeToFile:[docs stringByAppendingPathComponent:@"photoShutter.caf"] atomically:YES];
然后我使用第三方应用程序photoShutter.caf从 Documents 目录(Mac 的 DiskAid)中提取。下一步我photoShutter.caf在 Audacity 音频编辑器中打开并应用了反转效果,它在高缩放时看起来像这样:
photoShutter.caf
然后我将此声音保存为photoShutter2.caf并尝试在之前播放此声音captureStillImageAsynchronouslyFromConnection:
photoShutter2.caf
captureStillImageAsynchronouslyFromConnection
static SystemSoundID soundID = 0; if (soundID == 0) { NSString *path = [[NSBundle mainBundle] pathForResource:@"photoShutter2" ofType:@"caf"]; NSURL *filePath = [NSURL fileURLWithPath:path isDirectory:NO]; AudioServicesCreateSystemSoundID((__bridge CFURLRef)filePath, &soundID); } AudioServicesPlaySystemSound(soundID); [self.stillImageOutput captureStillImageAsynchronouslyFromConnection: ...
这真的有效!我运行了几次测试,每次我都听不到快门声:)
您可以通过以下链接在 iPhone 5S iOS 7.1.1 上获得已经倒置的声音:https ://www.dropbox.com/s/1echsi6ivbb85bv/photoShutter2.caf