Question

以下示例代码工作正常（感谢Oskar Jonsson）。

 ViewController.swift
 MicToSpeakers

Created by Oskar Jönsson on 2016-09-09.
Copyright © 2016 Oskar Jönsson. All rights reserved.


import UIKit
import AVFoundation

class ViewController: UIViewController {
var engine = AVAudioEngine()
let player = AVAudioPlayerNode()
let audioSession = AVAudioSession.sharedInstance()

override func viewDidLoad() {
    super.viewDidLoad()

    /* when these two lines uncommented. the device was able to playback on bluetooth earbuds, however its still using the internal mic

    try! audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord,
                                  mode:AVAudioSessionModeDefault,
                                  options:AVAudioSessionCategoryOptions.allowBluetoothA2DP)

    try! audioSession.setActive(true)
    */


    let input = engine.inputNode!

    engine.attach(player)

    let bus = 0
    let inputFormat = input.inputFormat(forBus: bus)

    engine.connect(player, to: engine.mainMixerNode, format: inputFormat)

    input.installTap(onBus: bus, bufferSize: 512, format: inputFormat) { (buffer, time) -> Void in
        self.player.scheduleBuffer(buffer)
        print(buffer)
    }



}




@IBAction func start(_ sender: Any) {

    do{
        try! engine.start()
    } catch {
        print(error)
    }


    player.play()


}

@IBAction func stop(_ sender: Any) {
    try! engine.stop()
    player.stop()

}

}

但它没有使用蓝牙麦克风＆amp;扬声器连接时。所以，我只想优先使用蓝牙耳机进行录制，并在连接时播放，而不是应用程序可以使用手机硬件。我玩 AVAudioSessionCategoryPlayAndRecord ，但我的试验都没有。

Answer 1

似乎是我的最后一次试验。

    let audioSession = AVAudioSession.sharedInstance()
    do {

        try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .allowBluetooth)
        try audioSession.setMode(AVAudioSessionModeDefault)
        try audioSession.setActive(true)
    } catch {
    print(error)
    }

现在我可以使用我的蓝牙耳机进行录音和播放而无需内置（iphone）麦克风或扬声器。这是完整的代码。

import UIKit
import AVFoundation

class ViewController: UIViewController {

var engine = AVAudioEngine()
let player = AVAudioPlayerNode()
let audioSession = AVAudioSession.sharedInstance()

override func viewDidLoad() {
    super.viewDidLoad()


    do {

        try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .allowBluetooth)
        try audioSession.setMode(AVAudioSessionModeDefault)
        try audioSession.setActive(true)
    } catch {
        print(error)
    }

    let input = engine.inputNode!

    engine.attach(player)

    let bus = 0
    let inputFormat = input.inputFormat(forBus: bus)

    engine.connect(player, to: engine.mainMixerNode, format: inputFormat)

    input.installTap(onBus: bus, bufferSize: 512, format: inputFormat) { (buffer, time) -> Void in
        self.player.scheduleBuffer(buffer)
        print(buffer)
    }



}




@IBAction func start(_ sender: Any) {

    do{
        try! engine.start()
    } catch {
        print(error)
    }


    player.play()


}

@IBAction func stop(_ sender: Any) {
    try! engine.stop()
    player.stop()

}

}

在测试之前不要忘记连接IB动作（开始和停止按钮）

Answer 2

在Swift 5中，它应该是：

audioSession.setCategory(.playAndRecord, mode: .default, options: .allowBluetooth)

使用蓝牙耳机麦克风录制和播放使用Avfoundation在Swift中发言

2 个答案: