我需要列出iOS应用程序可用的音频输出。我的问题与此类似：How to list available audio output route on iOS
我试过这段代码：
NSError *setCategoryError = nil;
BOOL success = [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback
error: &setCategoryError];
NSError *activationError = nil;
[[AVAudioSession sharedInstance] setActive: YES error: &activationError];
…
NSLog(@"session.currentRoute.outputs count %d", [[[[AVAudioSession sharedInstance] currentRoute] outputs ] count]);
for (AVAudioSessionPortDescription *portDesc in [[[AVAudioSession sharedInstance] currentRoute] outputs ]) {
NSLog(@"-----");
NSLog(@"portDesc UID %@", portDesc.UID);
NSLog(@"portDesc portName %@", portDesc.portName);
NSLog(@"portDesc portType %@", portDesc.portType);
NSLog(@"portDesc channels %@", portDesc.channels);
}
但是我总是看到一个输出端口（计数是1），如果我有两个（Airplay和内置扬声器）。 如果我使用音乐应用程序，我可以看到两个端口并在它们之间切换。 在我的应用程序中，我只看到我选择的那个。
我还需要做些什么吗？
谢谢
修改
我也试过这段代码：
CFDictionaryRef asCFType = nil;
UInt32 dataSize = sizeof(asCFType);
AudioSessionGetProperty(kAudioSessionProperty_AudioRouteDescription, &dataSize, &asCFType);
NSDictionary *audioRoutesDesc = (__bridge NSDictionary *)asCFType;
NSLog(@"audioRoutesDesc %@", audioRoutesDesc);
但字典只列出一个输出目的地。此外，输入源数组是空的（我有一个iPhone 4s）
EDIT2：
我使用MPVolumeView工作了。此组件有一个按钮，可让您选择输出音频路径，如音乐应用程序。
如果您需要，可以使用以下方法隐藏滑块（并且只有按钮）：
self.myMPVolumeView.showsVolumeSlider = NO;
答案 0 :(得分：3)
这取决于您的AVAudioSession类别。
您可以放心地在iPhone上假设您至少有麦克风作为输入，扬声器作为输出。如果您要获取蓝牙/ AirPlay输出列表，首先您必须确保您的会话类别向您报告：
do
{
try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, withOptions: .AllowBluetooth)
try audioSession.setActive(true)
}
catch let e
{
debugPrint("failed to initialize audio session: \(e)")
}
然后获得可用输出的非直观方法是检查AVAudioSession.availableInputs，因为通常蓝牙HFP设备也会有麦克风......我现在可能会假设很多..但这是唯一的方法始终如一地获得您的可用输出。
更好的方法是使用MultipleRoute类别，这样您可以更自由地访问AVAudioSessionPort
答案 1 :(得分：2)
尝试这样的事情，它比你需要的更多，但你可以减少它：
+ (NSString *) demonstrateInputSelection
{
NSError* theError = nil;
BOOL result = YES;
NSMutableString *info = [[NSMutableString alloc] init];
[info appendString: @" Device Audio Input Hardware\n"];
NSString *str = nil;
if( iOSMajorVersion < 7 ){
str = @"No input device information available";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
return info;
}
AVAudioSession* myAudioSession = [AVAudioSession sharedInstance];
result = [myAudioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&theError];
if (!result)
{
NSLog(@"setCategory failed");
}
result = [myAudioSession setActive:YES error:&theError];
if (!result)
{
NSLog(@"setActive failed");
}
// Get the set of available inputs. If there are no audio accessories attached, there will be
// only one available input -- the built in microphone.
NSArray* inputs = [myAudioSession availableInputs];
str = [NSString stringWithFormat:@"\n--- Ports available on %@: %d ---", [UIDevice currentDevice].name , [inputs count]];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
// Locate the Port corresponding to the built-in microphone.
AVAudioSessionPortDescription* builtInMicPort = nil;
AVAudioSessionDataSourceDescription* frontDataSource = nil;
for (AVAudioSessionPortDescription* port in inputs)
{
// Print out a description of the data sources for the built-in microphone
str = @"\n**********";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
str = [NSString stringWithFormat:@"Port :\"%@\": UID:%@", port.portName, port.UID ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
if( [port.dataSources count] ){
str = [NSString stringWithFormat:@"Port has %d data sources",(unsigned)[port.dataSources count] ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
str = [NSString stringWithFormat:@">%@", port.dataSources];
NSLog(@"%@",str);
// [info appendFormat:@"%@\n",str];
if( [port.portType isEqualToString:AVAudioSessionPortLineIn] ){
str = @"Line Input found";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
else if( [port.portType isEqualToString:AVAudioSessionPortUSBAudio] ){
str = @"USB Audio found";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
else if ([port.portType isEqualToString:AVAudioSessionPortBuiltInMic]){
builtInMicPort = port;
str = @"Built-in Mic found";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
else if ([port.portType isEqualToString:AVAudioSessionPortHeadsetMic]){
builtInMicPort = port;
str = @"Headset Mic found";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
else{
str = @"Other input source found";
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
// loop over the built-in mic's data sources and attempt to locate the front microphone
for (AVAudioSessionDataSourceDescription* source in port.dataSources)
{
str = [NSString stringWithFormat:@"\nName:%@ (%d) \nPolar:%@ \nType:%@ \nPatterns:%@", source.dataSourceName, [source.dataSourceID intValue], source.selectedPolarPattern, port.portType, source.supportedPolarPatterns];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
// if ([source.orientation isEqual:AVAudioSessionOrientationFront])
// {
// frontDataSource = source;
// break;
// }
} // end data source iteration
}
str = @"\n---- Current Selected Ports ----\n";
NSLog(@"%@",str);
[info appendFormat:@"%@",str];
NSArray *currentInputs = myAudioSession.currentRoute.inputs;
// str = [NSString stringWithFormat:@"\n%d current input ports", [currentInputs count]];
// NSLog(@"%@",str);
// [info appendFormat:@"%@\n",str];
for( AVAudioSessionPortDescription *port in currentInputs ){
str = [NSString stringWithFormat:@"\nInput Port :\"%@\":", port.portName ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
if( [port.dataSources count] ){
str = [NSString stringWithFormat:@"Port has %d data sources",(unsigned)[port.dataSources count] ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
str = [NSString stringWithFormat:@"Selected data source:%@", port.selectedDataSource.dataSourceName];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
if( [port.selectedDataSource.supportedPolarPatterns count] > 0 ){
str = [NSString stringWithFormat:@"Selected polar pattern:%@", port.selectedDataSource.selectedPolarPattern];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
}
}
NSArray *currentOutputs = myAudioSession.currentRoute.outputs;
// str = [NSString stringWithFormat:@"\n%d current output ports", [currentOutputs count]];
// NSLog(@"%@",str);
// [info appendFormat:@"%@\n",str];
for( AVAudioSessionPortDescription *port in currentOutputs ){
str = [NSString stringWithFormat:@"\nOutput Port :\"%@\":", port.portName ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
if( [port.dataSources count] ){
str = [NSString stringWithFormat:@"Port has %d data sources",(unsigned)[port.dataSources count] ];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
str = [NSString stringWithFormat:@"Selected data source:%@", port.selectedDataSource.dataSourceName];
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
}
}
// str = [NSString stringWithFormat:@"\Current Route: %@ Source:%@\n", myAudioSession.currentRoute.portName, myAudioSession.preferredInput.selectedDataSource.dataSourceName];
// NSLog(@"%@",str);
// [info appendFormat:@"%@\n",str];
if( myAudioSession.preferredInput.portName ){
str = [NSString stringWithFormat:@"\nPreferred Port: %@ Source:%@\n", myAudioSession.preferredInput.portName, myAudioSession.preferredInput.selectedDataSource.dataSourceName];
} else {
str = @"\nNo Preferred Port set";
}
NSLog(@"%@",str);
[info appendFormat:@"%@\n",str];
return info;
if (frontDataSource)
{
NSLog(@"Currently selected source is \"%@\" for port \"%@\"", builtInMicPort.selectedDataSource.dataSourceName, builtInMicPort.portName);
NSLog(@"Attempting to select source \"%@\" on port \"%@\"", frontDataSource, builtInMicPort.portName);
// Set a preference for the front data source.
theError = nil;
result = [builtInMicPort setPreferredDataSource:frontDataSource error:&theError];
if (!result)
{
// an error occurred. Handle it!
NSLog(@"setPreferredDataSource failed");
}
}
// Make sure the built-in mic is selected for input. This will be a no-op if the built-in mic is
// already the current input Port.
theError = nil;
result = [myAudioSession setPreferredInput:builtInMicPort error:&theError];
if (!result)
{
// an error occurred. Handle it!
NSLog(@"setPreferredInput failed");
}
return info;
}
答案 2 :(得分：1)
AVAudioSessionRouteDescription *currentRoute = [[AVAudioSession sharedInstance] currentRoute];
for (AVAudioSessionPortDescription *output in currentRoute.outputs) {
}
答案 3 :(得分：-1)
请查看完整的工作代码。
Complete code for audio session, output device handle and show in an action sheet.
在给定的链接中有以下文件可用。 以下是每个文件的简要说明。
AVAudioSessionHandler.swift->
所有必需的方法都可用，这对于根据选定的输出设备覆盖路由很有用。
AudioOutputDeviceHandler.swift->
所有必需的方法都可用，这对于获取输入设备列表，当前输出设备以及显示所有可用输入设备的操作表很有用。
SpeakerUIHandler.swift->
所有必需的方法都可用，这对于根据选定的输出设备更新Speaker UI很有用。
AudioSession.swift->
所有方法都可用，对于创建音频会话和设置音频会话的所有必需参数很有用。
请检查以下代码以获取可用输入设备列表的列表。
extension AVAudioSession {
@objc func ChangeAudioOutput(_ presenterViewController : UIViewController, _ speakerButton: UIButton) {
let CHECKED_KEY = "checked"
var deviceAction = UIAlertAction()
var headphonesExist = false
if AudioOutputDeviceHandler.sharedInstance.isDeviceListRequired() {
let optionMenu = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
for audioPort in self.availableInputs!{
switch audioPort.portType {
case AVAudioSession.Port.bluetoothA2DP, AVAudioSession.Port.bluetoothHFP, AVAudioSession.Port.bluetoothLE :
overrideBluetooth(audioPort, optionMenu)
break
case AVAudioSession.Port.builtInMic, AVAudioSession.Port.builtInReceiver:
deviceAction = overrideBuiltInReceiver(audioPort)
break
case AVAudioSession.Port.headphones, AVAudioSession.Port.headsetMic:
headphonesExist = true
overrideheadphones(audioPort,optionMenu)
break
case AVAudioSession.Port.carAudio:
overrideCarAudio(port: audioPort, optionMenu: optionMenu)
break
default:
break
}
}
if !headphonesExist {
if self.currentRoute.outputs.contains(where: {return $0.portType == AVAudioSession.Port.builtInReceiver}) || self.currentRoute.outputs.contains(where: {return $0.portType == AVAudioSession.Port.builtInMic}) {
deviceAction.setValue(true, forKey: CHECKED_KEY)
}
optionMenu.addAction(deviceAction)
}
overrideSpeaker(optionMenu)
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: {
(alert: UIAlertAction!) -> Void in
})
optionMenu.addAction(cancelAction)
alertViewSetupForIpad(optionMenu, speakerButton)
presenterViewController.present(optionMenu, animated: false, completion: nil)
// auto dismiss after 5 seconds
DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {
optionMenu.dismiss(animated: true, completion: nil)
}
} else {
if self.isBuiltInSpeaker {
if AudioOutputDeviceHandler.sharedInstance.isSpeaker {
let port = self.currentRoute.inputs.first!
setPortToNone(port)
AudioOutputDeviceHandler.sharedInstance.isSpeaker = false
}
}
else if self.isReceiver || self.isBuiltInMic || self.isHeadphonesConnected {
setPortToSpeaker()
AudioOutputDeviceHandler.sharedInstance.isSpeaker = true
}
}
}
func overrideCarAudio(port: AVAudioSessionPortDescription, optionMenu: UIAlertController) {
let action = UIAlertAction(title: port.portName, style: .default) { (action) in
do {
// set new input
try self.setPreferredInput(port)
} catch let error as NSError {
print("audioSession error change to input: \(port.portName) with error: \(error.localizedDescription)")
}
}
if self.currentRoute.outputs.contains(where: {return $0.portType == port.portType}){
action.setValue(true, forKey: "checked")
}
if let image = UIImage(named: "CarAudio") {
action.setValue(image, forKey: "image")
}
optionMenu.addAction(action)
}
func overrideheadphones(_ port: AVAudioSessionPortDescription, _ optionMenu: UIAlertController) {
let CHECKED_KEY = "checked"
let HEADPHONES_TITLE = "Headphones"
let action = UIAlertAction(title: HEADPHONES_TITLE, style: .default) { (action) in
do {
// set new input
try self.setPreferredInput(port)
} catch let error as NSError {
print("audioSession error change to input: \(port.portName) with error: \(error.localizedDescription)")
}
}
if self.currentRoute.outputs.contains(where: {return $0.portType == AVAudioSession.Port.headphones}) || self.currentRoute.outputs.contains(where: {return $0.portType == AVAudioSession.Port.headsetMic}) {
action.setValue(true, forKey: CHECKED_KEY)
}
if let image = UIImage(named: "Headphone") {
action.setValue(image, forKey: "image")
}
optionMenu.addAction(action)
}
func overrideSpeaker(_ optionMenu: UIAlertController) {
let SPEAKER_TITLE = "Speaker"
let CHECKED_KEY = "checked"
let speakerOutput = UIAlertAction(title: SPEAKER_TITLE, style: .default, handler: {
[weak self] (alert: UIAlertAction!) -> Void in
self?.setPortToSpeaker()
})
AudioOutputDeviceHandler.sharedInstance.isSpeaker = true
if self.currentRoute.outputs.contains(where: {return $0.portType == AVAudioSession.Port.builtInSpeaker}){
speakerOutput.setValue(true, forKey: CHECKED_KEY)
}
if let image = UIImage(named: "Speaker") {
speakerOutput.setValue(image, forKey: "image")
}
optionMenu.addAction(speakerOutput)
}
func overrideBluetooth(_ port: AVAudioSessionPortDescription, _ optionMenu: UIAlertController) {
let CHECKED_KEY = "checked"
let action = UIAlertAction(title: port.portName, style: .default) { (action) in
do {
// set new input
try self.setPreferredInput(port)
} catch let error as NSError {
print("audioSession error change to input: \(port.portName) with error: \(error.localizedDescription)")
}
}
if self.currentRoute.outputs.contains(where: {return $0.portType == port.portType}){
action.setValue(true, forKey: CHECKED_KEY)
}
if let image = UIImage(named: "Bluetooth") {
action.setValue(image, forKey: "image")
}
optionMenu.addAction(action)
}
func overrideBuiltInReceiver(_ port: AVAudioSessionPortDescription) -> UIAlertAction {
let IPHONE_TITLE = "iPhone"
let deviceAction = UIAlertAction(title: IPHONE_TITLE, style: .default) {[weak self] (action) in
self?.setPortToNone(port)
}
if let image = UIImage(named: "Device") {
deviceAction.setValue(image, forKey: "image")
}
return deviceAction
}
func setPortToSpeaker() {
do {
try self.overrideOutputAudioPort(AVAudioSession.PortOverride.speaker)
} catch let error as NSError {
print("audioSession error turning on speaker: \(error.localizedDescription)")
}
}
func setPortToNone(_ port: AVAudioSessionPortDescription) {
do {
// remove speaker if needed
try self.overrideOutputAudioPort(AVAudioSession.PortOverride.none)
// set new input
try self.setPreferredInput(port)
} catch let error as NSError {
print("audioSession error change to input: \(AVAudioSession.PortOverride.none.rawValue) with error: \(error.localizedDescription)")
}
}
func alertViewSetupForIpad(_ optionMenu: UIAlertController, _ speakerButton: UIButton) {
optionMenu.modalPresentationStyle = .popover
if let presenter = optionMenu.popoverPresentationController {
presenter.sourceView = speakerButton;
presenter.sourceRect = speakerButton.bounds;
}
}
}
extension AVAudioSession {
static var isHeadphonesConnected: Bool {
return sharedInstance().isHeadphonesConnected
}
static var isBluetoothConnected: Bool {
return sharedInstance().isBluetoothConnected
}
static var isCarAudioConnected: Bool {
return sharedInstance().isCarAudioConnected
}
static var isBuiltInSpeaker: Bool {
return sharedInstance().isBuiltInSpeaker
}
static var isReceiver: Bool {
return sharedInstance().isReceiver
}
static var isBuiltInMic: Bool {
return sharedInstance().isBuiltInMic
}
var isCarAudioConnected: Bool {
return !currentRoute.outputs.filter { $0.isCarAudio }.isEmpty
}
var isHeadphonesConnected: Bool {
return !currentRoute.outputs.filter { $0.isHeadphones }.isEmpty
}
var isBluetoothConnected: Bool {
return !currentRoute.outputs.filter { $0.isBluetooth }.isEmpty
}
var isBuiltInSpeaker: Bool {
return !currentRoute.outputs.filter { $0.isSpeaker }.isEmpty
}
var isReceiver: Bool {
return !currentRoute.outputs.filter { $0.isReceiver }.isEmpty
}
var isBuiltInMic: Bool {
return !currentRoute.outputs.filter { $0.isBuiltInMic }.isEmpty
}
}
extension AVAudioSessionPortDescription {
var isHeadphones: Bool {
return portType == AVAudioSession.Port.headphones || portType == AVAudioSession.Port.headsetMic
}
var isBluetooth: Bool {
return portType == AVAudioSession.Port.bluetoothHFP || portType == AVAudioSession.Port.bluetoothA2DP || portType == AVAudioSession.Port.bluetoothLE
}
var isCarAudio: Bool {
return portType == AVAudioSession.Port.carAudio
}
var isSpeaker: Bool {
return portType == AVAudioSession.Port.builtInSpeaker
}
var isBuiltInMic: Bool {
return portType == AVAudioSession.Port.builtInMic
}
var isReceiver: Bool {
return portType == AVAudioSession.Port.builtInReceiver
}
}