如何路由iPhone音频的蓝牙耳机 [英] how to route iPhone audio to the bluetooth headset

问题描述

我试图输出音频使用AVAudioPlayer，AVAudioSession和AudioSessionSetProperty蓝牙耳机（A2DP没有）。

I'm attempting to output audio to the bluetooth headset (not A2DP) using AVAudioPlayer, AVAudioSession and AudioSessionSetProperty.

似乎有功能，选择蓝牙耳机作为输入（kAudioSessionProperty_OverrideCategoryEnableBluetoothInput），但没有类似设置输出。这是在语音应用程序，在这里你可以选择耳机，手机音箱或扬声器电话完成的。我试过SessionCategories和AudioSession性质的各种组合，但我似乎无法击中，工程的方法。

There seems to be functions to select the bluetooth headset as input (kAudioSessionProperty_OverrideCategoryEnableBluetoothInput), but no equivalent for setting the output. This is done in the Voicemail app, where you can select the headset, handset speaker or speaker phone. I've tried various combinations of SessionCategories and the AudioSession properties, but I just can't seem to hit on an approach that works.

我敢肯定有人想通了这一点，愿意分享一个例子吗？

I'm sure someone has figured this out, care to share an example?

推荐答案

这个小测试工作对我来说...它涉及设置蓝牙耳机作为输入也（不知道如果这就是你想要的）。遗憾的code ...

This little test worked for me... it involves setting up the bluetooth headset as the input also (not sure if that's what you want). Sorry about the crappy formatting on the code...

// create and set up the audio session
AVAudioSession* audioSession = [AVAudioSession sharedInstance];
[audioSession setDelegate:self];
[audioSession setCategory: AVAudioSessionCategoryPlayAndRecord error: nil];
[audioSession setActive: YES error: nil];

// set up for bluetooth microphone input
UInt32 allowBluetoothInput = 1;
OSStatus stat = AudioSessionSetProperty (
                         kAudioSessionProperty_OverrideCategoryEnableBluetoothInput,
                         sizeof (allowBluetoothInput),
                         &allowBluetoothInput
                        );
NSLog(@"status = %x", stat);    // problem if this is not zero

// check the audio route
UInt32 size = sizeof(CFStringRef);
CFStringRef route;
OSStatus result = AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &size, &route);
NSLog(@"route = %@", route);    
// if bluetooth headset connected, should be "HeadsetBT"
// if not connected, will be "ReceiverAndMicrophone"

// now, play a quick sound we put in the bundle (bomb.wav)
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFURLRef        soundFileURLRef;
SystemSoundID   soundFileObject;
soundFileURLRef  = CFBundleCopyResourceURL (mainBundle,CFSTR ("bomb"),CFSTR ("wav"),NULL);
AudioServicesCreateSystemSoundID (soundFileURLRef,&soundFileObject);
AudioServicesPlaySystemSound (soundFileObject);     // should play into headset

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