强制iPhone麦克风作为音频输入
强制iPhone麦克风作为音频输入
提问于 2010-10-23 02:23:14
我正在开发一个iOS应用程序(目前专门针对iPhone )，它要求应用程序只从iPhone内部麦克风录制音频(即使耳机/耳机已插入)，并在耳机上播放(假设耳机目前已插入)。
我想知道目前可用的API是否能够做到这一点？如果是这样的话，谁能给我说明一下我该怎么做呢？
谢谢!
回答 6
Stack Overflow用户
发布于 2011-02-14 17:00:26
我相信这个问题的答案是“不”。我使用了iPhone 4和新到iOS 4的AVFoundation进行实验，重点放在AVCaptureDevice类上。
我在应用程序中添加了以下内容：
NSLog(@"%@", [AVCaptureDevice devices]);因此，这要求列出所有可用于捕获音频和/或视频的设备。如果没有耳机插上，我会得到：
(
"Back Camera",
"Front Camera",
"iPhone Microphone"
)戴上耳机后，我得到：
(
"Back Camera",
"Front Camera",
Headphones
)因此，一旦耳机可用，iPhone麦克风就会从可用的AVCaptureDevices列表中删除。为了进一步探讨这个问题，我添加了一些快速代码来获取可用音频设备的AVCaptureDevice实例，并打印其唯一的ID。对于识别自己为"iPhone麦克风“的设备和标识自己为”耳机“的设备，我得到了以下信息：
com.apple.avfoundation.avcapturedevice.built-in_audio:0在我看来，很明显，两个设备不能有相同的唯一ID，所以很明显，是同一个设备在改变它的状态。虽然AVCaptureDevices有很多设置状态的东西，但它仅限于视觉方面的东西，如焦点、曝光、闪光灯和白平衡。
Stack Overflow用户
发布于 2013-04-04 14:01:10
看来这真的不可能。
我的目标是发送输出到蓝牙耳机，并从其中记录输入。据我所见，我最好的选择是："PlayAndRecord + AllowBluetoothInput“属性(iphone 4，nokia 214耳机)。
重要的是，根据苹果的文档，你总是必须重写你的音频类别时，音频路线改变！
这是我的路由更改侦听器方法，它打印: RouteChangeReasons、outputRoute、audioRout
void RouteChangeListener(void *inClientData,
AudioSessionPropertyID inID,
UInt32 inDataSize,
const void *inData) {
if (inID == kAudioSessionProperty_AudioRouteChange) {
NSLog(@"]-----------------[ Audio Route Change ]--------------------[");
// ************************************************************************************************
// Check route change reason **********************************************************************
// ************************************************************************************************
CFDictionaryRef routeDict = (CFDictionaryRef)inData;
NSNumber* reasonValue = (NSNumber*)CFDictionaryGetValue(routeDict, CFSTR(kAudioSession_AudioRouteChangeKey_Reason));
int reason = [reasonValue intValue];
if (reason == kAudioSessionRouteChangeReason_OldDeviceUnavailable) {
NSLog(@"] Logic: audio route change reason: OldDeviceUnavailable");
}else if (reason == kAudioSessionRouteChangeReason_NewDeviceAvailable ) {
NSLog(@"] Logic: audio route change reason: NewDeviceAvailable");
}else if (reason == kAudioSessionRouteChangeReason_Unknown ) {
NSLog(@"] Logic: audio route change reason: Unknown");
}else if (reason == kAudioSessionRouteChangeReason_CategoryChange ) {
NSLog(@"] Logic: audio route change reason: CategoryChange");
}else if (reason == kAudioSessionRouteChangeReason_Override ) {
NSLog(@"] Logic: audio route change reason: Override");
}else if (reason == kAudioSessionRouteChangeReason_WakeFromSleep ) {
NSLog(@"] Logic: audio route change reason: WakeFromSleep");
}else if (reason == kAudioSessionRouteChangeReason_NoSuitableRouteForCategory ) {
NSLog(@"] Logic: audio route chang reasone: NoSuitableRouteForCategory");
}
// ************************************************************************************************
// Check output type ******************************************************************************
// ************************************************************************************************
CFDictionaryRef currentRouteDescriptionDictionary = nil;
UInt32 dataSize = sizeof(currentRouteDescriptionDictionary);
AudioSessionGetProperty(kAudioSessionProperty_AudioRouteDescription, &dataSize, ¤tRouteDescriptionDictionary);
if (currentRouteDescriptionDictionary) {
CFArrayRef outputs = CFDictionaryGetValue(currentRouteDescriptionDictionary, kAudioSession_AudioRouteKey_Outputs);
if(CFArrayGetCount(outputs) > 0) {
CFDictionaryRef currentOutput = CFArrayGetValueAtIndex(outputs, 0);
CFStringRef outputType = CFDictionaryGetValue(currentOutput, kAudioSession_AudioRouteKey_Type);
if ( (CFStringCompare(outputType, kAudioSessionOutputRoute_AirPlay, 0) == kCFCompareEqualTo) ) { // if Airplay
NSLog(@"] Logic: output changed to Airplay");
}
else if ( (CFStringCompare(outputType, kAudioSessionOutputRoute_BluetoothA2DP, 0) == kCFCompareEqualTo) ) { // if Bluetooth A2DP
NSLog(@"] Logic: output changed to A2DP");
// Mix with others category
UInt32 doSetProperty = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers,sizeof(doSetProperty),&doSetProperty);
// Bluetooth support enable
UInt32 allowBluetoothInput = 1;
AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryEnableBluetoothInput,sizeof (allowBluetoothInput),&allowBluetoothInput);
}
else if ( (CFStringCompare(outputType, kAudioSessionOutputRoute_BluetoothHFP, 0) == kCFCompareEqualTo) ) { // if Bluetooth HFP
NSLog(@"] Logic: output changed to HFP");
// Mix with others category
UInt32 doSetProperty = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers,sizeof(doSetProperty),&doSetProperty);
// Bluetooth support enable
UInt32 allowBluetoothInput = 1;
AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryEnableBluetoothInput,sizeof (allowBluetoothInput),&allowBluetoothInput);
}
else if ( (CFStringCompare(outputType, kAudioSessionOutputRoute_LineOut, 0) == kCFCompareEqualTo) ) { // if Line Out
NSLog(@"] Logic: output changed to Line Out");
}
else if ( (CFStringCompare(outputType, kAudioSessionOutputRoute_Headphones, 0) == kCFCompareEqualTo) ) { // if Headphones
NSLog(@"] Logic: output changed to Headphone");
// Mix with others category
UInt32 doSetProperty = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers,sizeof(doSetProperty),&doSetProperty);
// Bluetooth support disable
UInt32 allowBluetoothInput = 0;
AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryEnableBluetoothInput,sizeof (allowBluetoothInput),&allowBluetoothInput);
}
else if ( (CFStringCompare(outputType, kAudioSessionOutputRoute_BuiltInSpeaker, 0) == kCFCompareEqualTo) ) { // if Built In Speaker
NSLog(@"] Logic: output changed to Built In Speaker");
// Mix with others category
UInt32 doSetProperty = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers,sizeof(doSetProperty),&doSetProperty);
}
else if ( (CFStringCompare(outputType, kAudioSessionOutputRoute_USBAudio, 0) == kCFCompareEqualTo) ) { // if USB audio
NSLog(@"] Logic: output changed to USB Audio");
}
else if ( (CFStringCompare(outputType, kAudioSessionOutputRoute_HDMI, 0) == kCFCompareEqualTo) ) { // if HDMI
NSLog(@"] Logic: output changed to HDMI");
}
else if ( (CFStringCompare(outputType, kAudioSessionOutputRoute_BuiltInReceiver, 0) == kCFCompareEqualTo) ) { // if Built in Reciever
NSLog(@"] Logic: output changed to Built in Reciever");
// Mix with others category
UInt32 doSetProperty = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers,sizeof(doSetProperty),&doSetProperty);
}
else { // Unknown audio type
NSLog(@"] Logic: WARNING: Unknown audio type: %@",(NSString*)outputType);
}
}
}
// ************************************************************************************************
// Check audio route ******************************************************************************
// ************************************************************************************************
UInt32 routeSize = sizeof(CFStringRef);
CFStringRef route;
AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &routeSize, &route);
NSLog(@"] Logic: the audio route is: %@",(NSString*)route);
// ************************************************************************************************
NSLog(@"]--------------------------[ ]-----------------------------[");
}}
Stack Overflow用户
发布于 2014-10-14 14:21:15
由于苹果公司从7.0开始再次改变了音频系统，我将在这里发布更新的代码：
#pragma mark Route change listener
// *********************************************************************************************************
// *********** Route change listener ***********************************************************************
// *********************************************************************************************************
-(void)routeChanged:(NSNotification*)notification {
NSLog(@"]-----------------[ Audio Route Change ]--------------------[");
AVAudioSession *session = [AVAudioSession sharedInstance];
//AVAudioSessionRouteDescription* prevRoute = [[notification userInfo] objectForKey:AVAudioSessionRouteChangePreviousRouteKey];
// Reason
NSInteger reason = [[[notification userInfo] objectForKey:AVAudioSessionRouteChangeReasonKey] integerValue];
switch (reason) {
case AVAudioSessionRouteChangeReasonNoSuitableRouteForCategory:
NSLog(@"] Audio Route: The route changed because no suitable route is now available for the specified category.");
break;
case AVAudioSessionRouteChangeReasonWakeFromSleep:
NSLog(@"] Audio Route: The route changed when the device woke up from sleep.");
break;
case AVAudioSessionRouteChangeReasonOverride:
NSLog(@"] Audio Route: The output route was overridden by the app.");
break;
case AVAudioSessionRouteChangeReasonCategoryChange:
NSLog(@"] Audio Route: The category of the session object changed.");
break;
case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:
NSLog(@"] Audio Route: The previous audio output path is no longer available.");
break;
case AVAudioSessionRouteChangeReasonNewDeviceAvailable:
NSLog(@"] Audio Route: A preferred new audio output path is now available.");
break;
case AVAudioSessionRouteChangeReasonUnknown:
NSLog(@"] Audio Route: The reason for the change is unknown.");
break;
default:
NSLog(@"] Audio Route: The reason for the change is very unknown.");
break;
}
// Output
AVAudioSessionPortDescription *output = [[session.currentRoute.outputs count]?session.currentRoute.outputs:nil objectAtIndex:0];
if ([output.portType isEqualToString:AVAudioSessionPortLineOut]) {
NSLog(@"] Audio Route: Output Port: LineOut");
}
else if ([output.portType isEqualToString:AVAudioSessionPortHeadphones]) {
NSLog(@"] Audio Route: Output Port: Headphones");
}
else if ([output.portType isEqualToString:AVAudioSessionPortBluetoothA2DP]) {
NSLog(@"] Audio Route: Output Port: BluetoothA2DP");
}
else if ([output.portType isEqualToString:AVAudioSessionPortBuiltInReceiver]) {
NSLog(@"] Audio Route: Output Port: BuiltInReceiver");
}
else if ([output.portType isEqualToString:AVAudioSessionPortBuiltInSpeaker]) {
NSLog(@"] Audio Route: Output Port: BuiltInSpeaker");
}
else if ([output.portType isEqualToString:AVAudioSessionPortHDMI]) {
NSLog(@"] Audio Route: Output Port: HDMI");
}
else if ([output.portType isEqualToString:AVAudioSessionPortAirPlay]) {
NSLog(@"] Audio Route: Output Port: AirPlay");
}
else if ([output.portType isEqualToString:AVAudioSessionPortBluetoothLE]) {
NSLog(@"] Audio Route: Output Port: BluetoothLE");
}
else {
NSLog(@"] Audio Route: Output Port: Unknown: %@",output.portType);
}
// Input
AVAudioSessionPortDescription *input = [[session.currentRoute.inputs count] ? session.currentRoute.inputs:nil objectAtIndex:0];
if ([input.portType isEqualToString:AVAudioSessionPortLineIn]) {
NSLog(@"] Audio Route: Input Port: LineIn");
}
else if ([input.portType isEqualToString:AVAudioSessionPortBuiltInMic]) {
NSLog(@"] Audio Route: Input Port: BuiltInMic");
}
else if ([input.portType isEqualToString:AVAudioSessionPortHeadsetMic]) {
NSLog(@"] Audio Route: Input Port: HeadsetMic");
}
else if ([input.portType isEqualToString:AVAudioSessionPortBluetoothHFP]) {
NSLog(@"] Audio Route: Input Port: BluetoothHFP");
}
else if ([input.portType isEqualToString:AVAudioSessionPortUSBAudio]) {
NSLog(@"] Audio Route: Input Port: USBAudio");
}
else if ([input.portType isEqualToString:AVAudioSessionPortCarAudio]) {
NSLog(@"] Audio Route: Input Port: CarAudio");
}
else {
NSLog(@"] Audio Input Port: Unknown: %@",input.portType);
}
NSLog(@"]--------------------------[ ]-----------------------------[");
}请记住添加观察者，因为音频会话的委托也是不推荐的：
[[NSNotificationCenter defaultCenter] addObserver: self
selector: @selector(audioInterruption:)
name: AVAudioSessionInterruptionNotification
object: nil];PS:您不需要在这里重置类别(如6.0中所示)。
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原文链接：
https://stackoverflow.com/questions/4002133
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