- 作用
AVPLayer:可以用来播放在线及本地音视频
AVAudioSession:音频会话,主要用来管理音频设置与硬件交互
使用时需要导入
#import <AVFoundation/AVFoundation.h>
AVAudioSessionCategory
注意:除了 AVAudioSessionCategoryMultiRoute 外,其他的 Category 都遵循 last in wins 原则,即最后接入的音频设备作为输入或输出的主设备。
1.AVAudioSessionCategoryAmbient
当前App的播放声音可以和其他app播放的声音共存,当锁屏或按静音时停止。
2.AVAudioSessionCategorySoloAmbient
只能播放当前App的声音,其他app的声音会停止,当锁屏或按静音时停止。
3.AVAudioSessionCategoryPlayback
只能播放当前App的声音,其他app的声音会停止,当锁屏或按静音时不会停止。
4.AVAudioSessionCategoryRecord
只能用于录音,其他app的声音会停止,当锁屏或按静音时不会停止
5.AVAudioSessionCategoryPlayAndRecord
在录音的同时播放其他声音,当锁屏或按静音时不会停止
可用于听筒播放,比如微信语音消息听筒播放
6.AVAudioSessionCategoryAudioProcessing
使用硬件解码器处理音频,该音频会话使用期间,不能播放或录音
7.AVAudioSessionCategoryMultiRoute
多种音频输入输出,例如可以耳机、USB设备同时播放等
AVAudioSessionCategoryOptions
1.AVAudioSessionModeDefault
默认的模式,适用于所有的场景,可用于场景还原
2.AVAudioSessionModeVoiceChat
适用类别 :
AVAudioSessionCategoryPlayAndRecord
应用场景VoIP
3.AVAudioSessionModeGameChat
适用类别:
AVAudioSessionCategoryPlayAndRecord
应用场景游戏录制,由GKVoiceChat自动设置,无需手动调用
4.AVAudioSessionModeVideoRecording
适用类别:
AVAudioSessionCategoryPlayAndRecord
AVAudioSessionCategoryRecord
应用场景视频录制
5.AVAudioSessionModeMoviePlayback
适用类别:
AVAudioSessionCategoryPlayBack
应用场景视频播放
6.AVAudioSessionModeVideoChat
适用类别:
AVAudioSessionCategoryPlayAndRecord
应用场景视频通话
7.AVAudioSessionModeMeasurement
适用类别:
AVAudioSessionCategoryPlayAndRecord
AVAudioSessionCategoryRecord
AVAudioSessionCategoryPlayback
AVAudioSessionModeSpokenAudio
AVAudioSessionMode
1.AVAudioSessionCategoryOptionMixWithOthers
适用于:
AVAudioSessionCategoryPlayAndRecord
AVAudioSessionCategoryPlayback
AVAudioSessionCategoryMultiRoute
用于可以和其他app进行混音
2.AVAudioSessionCategoryOptionDuckOthers
适用于:
AVAudioSessionCategoryAmbient
AVAudioSessionCategoryPlayAndRecord
AVAudioSessionCategoryPlayback
AVAudioSessionCategoryMultiRoute
用于压低其他声音播放的音量,使期音量变小
3.AVAudioSessionCategoryOptionAllowBluetooth
适用于:
AVAudioSessionCategoryRecord and AVAudioSessionCategoryPlayAndRecord
用于是否支持蓝牙设备耳机等
4.AVAudioSessionCategoryOptionDefaultToSpeaker
适用于:
AVAudioSessionCategoryPlayAndRecord
用于将声音从Speaker播放,外放,即免提
5.AVAudioSessionCategoryOptionInterruptSpokenAudioAndMixWithOthers
适用于:
AVAudioSessionCategoryPlayAndRecord
AVAudioSessionCategoryPlayback
AVAudioSessionCategoryMultiRoute
6.AVAudioSessionCategoryOptionAllowBluetoothA2DP
适用于:
AVAudioSessionCategoryPlayAndRecord
蓝牙和a2dp
7.AVAudioSessionCategoryOptionAllowAirPlay
适用于:
AVAudioSessionCategoryPlayAndRecord
airplay
使用AVAudioSession对上下文app进行音频控制
/**
* SetAVAudioSessionCategory
*/
- (void)setAVAudioSessionCategory:(NSString *)category
options:(AVAudioSessionCategoryOptions)options {
NSError *error = nil;
BOOL success = [[AVAudioSession sharedInstance] setCategory:category withOptions:options error:&error];
if (!success) {
NSLog(@"SetCategory error:%@ ",error.description);
}
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
BOOL ret = [audioSession setActive:YES error:&error];
if (!ret) {
NSLog(@"%s - activate audio session failed with error %@", __func__,[error description]);
}
}
@property (strong, nonatomic) AVPlayer *avPlayer;
AVPlayerItem *playerItem = [self creatAVPlayerItemWithUrlStr:AudioUrlStr];
self.playState = VoicePlayStateLoding;
if (self.avPlayer != nil && self.avPlayer.status == AVPlayerStatusReadyToPlay) {
[self.avPlayer replaceCurrentItemWithPlayerItem:playerItem];
} else {
self.avPlayer = [AVPlayer playerWithPlayerItem:playerItem];
}
[self setSessionLabType:@"SoloAmbient"];
- 监听音频受其他事件(电话,闹铃,其他app占用通道)影响
- (void)customAddNotification {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(audioRouteChangeListenerCallback:)
name:AVAudioSessionRouteChangeNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(otherAppAudioSessionCallBack:)
name:AVAudioSessionSilenceSecondaryAudioHintNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(systermAudioSessionCallBack:)
name:AVAudioSessionInterruptionNotification object:nil];
}
// 监听外部设备改变
- (void)audioRouteChangeListenerCallback:(NSNotification*)notification {
NSDictionary *interuptionDict = notification.userInfo;
NSInteger routeChangeReason = [[interuptionDict valueForKey:AVAudioSessionRouteChangeReasonKey] integerValue];
switch (routeChangeReason) {
case AVAudioSessionRouteChangeReasonNewDeviceAvailable:{
NSLog(@"headset input");
break;
}
case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:{
NSLog(@"pause play when headset output");
[self.avPlayer pause];
break;
}
case AVAudioSessionRouteChangeReasonCategoryChange:
NSLog(@"AVAudioSessionRouteChangeReasonCategoryChange");
break;
}
}
// 其他app占用音频通道
- (void)otherAppAudioSessionCallBack:(NSNotification *)notification {
NSDictionary *interuptionDict = notification.userInfo;
NSInteger interuptType = [[interuptionDict valueForKey:AVAudioSessionSilenceSecondaryAudioHintTypeKey] integerValue];
switch (interuptType) {
case AVAudioSessionSilenceSecondaryAudioHintTypeBegin:{
[self.avPlayer pause];
NSLog(@"pause play when other app occupied session");
break;
}
case AVAudioSessionSilenceSecondaryAudioHintTypeEnd:{
NSLog(@"occupied session");
break;
}
default:
break;
}
}
// 电话、闹铃等一般性中断通知
- (void)systermAudioSessionCallBack:(NSNotification *)notification {
NSDictionary *interuptionDict = notification.userInfo;
NSInteger interuptType = [[interuptionDict valueForKey:AVAudioSessionInterruptionTypeKey] integerValue];
switch (interuptType) {
case AVAudioSessionInterruptionTypeBegan:{
[self.avPlayer pause];
NSLog(@"pause play when phone call or alarm ");
break;
}
case AVAudioSessionInterruptionTypeEnded:{
break;
}
default:
break;
}
}