我正在使用AVPlayer从网址播放音频，但是当iPhone连接到蓝牙设备时，它不能通过蓝牙播放，如果连接后如何通过蓝牙播放，我看到SO中的一些帖子，但这些都不是清楚解释。以下是我的代码。
-(void)playselectedsong{
AVPlayer *player = [[AVPlayer alloc]initWithURL:[NSURL URLWithString:urlString]];
self.songPlayer = player;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playerItemDidReachEnd:)
name:AVPlayerItemDidPlayToEndTimeNotification
object:[songPlayer currentItem]];
[self.songPlayer addObserver:self forKeyPath:@"status" options:0 context:nil];
[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateProgress:) userInfo:nil repeats:YES];
[self.songPlayer play];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if (object == songPlayer && [keyPath isEqualToString:@"status"]) {
if (songPlayer.status == AVPlayerStatusFailed) {
NSLog(@"AVPlayer Failed");
} else if (songPlayer.status == AVPlayerStatusReadyToPlay) {
NSLog(@"AVPlayerStatusReadyToPlay");
} else if (songPlayer.status == AVPlayerItemStatusUnknown) {
NSLog(@"AVPlayer Unknown");
}
}
}
- (void)playerItemDidReachEnd:(NSNotification *)notification {
// code here to play next sound file
}
尝试这个
UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
AudioSessionSetProperty (kAudioSessionProperty_AudioCategory,
sizeof(sessionCategory),&sessionCategory);
// Set AudioSession
NSError *sessionError = nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionAllowBluetooth error:&sessionError];
UInt32 doChangeDefaultRoute = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryEnableBluetoothInput, sizeof(doChangeDefaultRoute), &doChangeDefaultRoute);
对于Swift 3.1
简洁版本：
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(AVAudioSessionCategoryRecord, with: [.allowBluetooth])
try audioSession.setActive(true)
} catch {
fatalError("Error Setting Up Audio Session")
}
扩展版本，确保您正在使用正确的输入：
/**
Check availability of recording and setups audio session
with prioritized input.
*/
func setupSessionForRecording() {
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(AVAudioSessionCategoryRecord, with: [.allowBluetooth])
} catch {
fatalError("Error Setting Up Audio Session")
}
var inputsPriority: [(type: String, input: AVAudioSessionPortDescription?)] = [
(AVAudioSessionPortLineIn, nil),
(AVAudioSessionPortHeadsetMic, nil),
(AVAudioSessionPortBluetoothHFP, nil),
(AVAudioSessionPortUSBAudio, nil),
(AVAudioSessionPortCarAudio, nil),
(AVAudioSessionPortBuiltInMic, nil),
]
for availableInput in audioSession.availableInputs! {
guard let index = inputsPriority.index(where: { $0.type == availableInput.portType }) else { continue }
inputsPriority[index].input = availableInput
}
guard let input = inputsPriority.filter({ $0.input != nil }).first?.input else {
fatalError("No Available Ports For Recording")
}
do {
try audioSession.setPreferredInput(input)
try audioSession.setActive(true)
} catch {
fatalError("Error Setting Up Audio Session")
}
}
/**
Check availability of playing audio and setups audio session
with mixing audio.
*/
func setupSessionForPlaying() {
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(AVAudioSessionCategoryPlayback, with: [.mixWithOthers])
try audioSession.setActive(true)
} catch {
fatalError("Error Setting Up Audio Session")
}
}
您有2个功能可以更改音频会话设置的主要思想。使用 setupSessionForRecording 在录制之前，和 setupSessionForPlaying 在播放音频之前。
重要 使用 AVAudioSessionCategoryRecord 和 AVAudioSessionCategoryPlayback， 但不是 AVAudioSessionCategoryPlayAndRecord，因为它的马车。使用 AVAudioSessionCategoryPlayAndRecord 只有你真的需要同时播放和录制音频。
您需要在上面设置类别和选项 AVAudioSession。
在应用启动时尝试此操作：
//configure audio session
NSError *setCategoryError = nil;
BOOL setCategorySuccess = [[AVAudioSession sharedInstance]
setCategory:AVAudioSessionCategoryPlayback
withOptions:AVAudioSessionCategoryOptionAllowBluetooth
error:&setCategoryError];
if (setCategorySuccess) {
NSLog(@"Audio Session options set.");
} else {
NSLog(@"WARNING: Could not set audio session options.");
}