[音频]检测音频口设备

本方法主要用于检测音频口设备是否插入。
以对其做了iOS 7判断优化。

分别加入
[objc]
AudioToolbox.framework
AVFoundation.framework
[/objc]
引入
[objc]
#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVAudioSession.h>
[/objc]
以及自定义宏
[objc]
#define iOS7 ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
[/objc]
代码如下：
[objc]
– (BOOL)hasHeadset {

#if TARGET_IPHONE_SIMULATOR //[宏]判断是否为模拟器
#warning *** Simulator mode: audio session code works only on a device
//由于模拟器没有音频口可以测试，所以默认返回NO；
return NO;
#else

if (iOS7) {
//由于iOS 7 会提示AudioSessionGetProperty被弃用，所以我们使用AVAudioSession来代替
//备注：该方法必须在 iOS 6 之后版本使用。
NSArray *headsetAr =[[[AVAudioSession sharedInstance] currentRoute] outputs];
AVAudioSessionPortDescription *port =[headsetAr objectAtIndex:0];

NSLog(@"端口设备: %@ %@",[port portName],[port portType]);

NSRange headphoneRange = [[port portType] rangeOfString : @"Headphone"];
NSRange headsetRange = [[port portType] rangeOfString : @"Headset"];
if (headphoneRange.location != NSNotFound) {
return YES;
} else if(headsetRange.location != NSNotFound) {
return YES;
}
return NO;

}else{

CFStringRef route;
UInt32 propertySize = sizeof(CFStringRef);

AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &propertySize, &route);
//获取到音频会话属性值。
if((route == NULL) || (CFStringGetLength(route) == 0)){
//音频线路为静音模式
} else {
NSString* routeStr = (__bridge NSString*)route;
NSLog(@"音频线路: %@", routeStr);

/* 已知的线路有如下:
* 由于在 iOS Developer Library 找不到准确资料，
* 所以下面资料来源于 StackOverflow 仅供参考
* "Headset"
* "Headphone"
* "Speaker"
* "SpeakerAndMicrophone"
* "HeadphonesAndMicrophone"
* "HeadsetInOut"
* "ReceiverAndMicrophone"
* "Lineout"
*/

NSRange headphoneRange = [routeStr rangeOfString : @"Headphone"];
NSRange headsetRange = [routeStr rangeOfString : @"Headset"];
if (headphoneRange.location != NSNotFound) {
return YES;
} else if(headsetRange.location != NSNotFound) {
return YES;
}
}
return NO;
}

#endif
}
[/objc]

By userKuma | 2014-01-25 | iOS 开发 | 148 Comments |

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