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から
@interface AudioRouter : NSObject
+ (void) initAudioSessionRouting;
+ (void) switchToDefaultHardware;
+ (void) forceOutputToBuiltInSpeakers;
@end
および
#import "AudioRouter.h"
#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVFoundation.h>
@implementation AudioRouter
#define IS_DEBUGGING NO
#define IS_DEBUGGING_EXTRA_INFO NO
+ (void) initAudioSessionRouting {
// Called once to route all audio through speakers, even if something's plugged into the headphone jack
static BOOL audioSessionSetup = NO;
if (audioSessionSetup == NO) {
// set category to accept properties assigned below
NSError *sessionError = nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionDefaultToSpeaker error: &sessionError];
// Doubly force audio to come out of speaker
UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride);
// fix issue with audio interrupting video recording - allow audio to mix on top of other media
UInt32 doSetProperty = 1;
AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(doSetProperty), &doSetProperty);
// set active
[[AVAudioSession sharedInstance] setDelegate:self];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
// add listener for audio input changes
AudioSessionAddPropertyListener (kAudioSessionProperty_AudioRouteChange, onAudioRouteChange, nil);
AudioSessionAddPropertyListener (kAudioSessionProperty_AudioInputAvailable, onAudioRouteChange, nil);
}
// Force audio to come out of speaker
[[AVAudioSession sharedInstance] overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:nil];
// set flag
audioSessionSetup = YES;
}
+ (void) switchToDefaultHardware {
// Remove forcing to built-in speaker
UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_None;
AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride);
}
+ (void) forceOutputToBuiltInSpeakers {
// Re-force audio to come out of speaker
UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride);
}
void onAudioRouteChange (void* clientData, AudioSessionPropertyID inID, UInt32 dataSize, const void* inData) {
if(IS_DEBUGGING == YES) {
NSLog(@"==== Audio Harware Status ====");
NSLog(@"Current Input: %@", [AudioRouter getAudioSessionInput]);
NSLog(@"Current Output: %@", [AudioRouter getAudioSessionOutput]);
NSLog(@"Current hardware route: %@", [AudioRouter getAudioSessionRoute]);
NSLog(@"==============================");
}
if(IS_DEBUGGING_EXTRA_INFO == YES) {
NSLog(@"==== Audio Harware Status (EXTENDED) ====");
CFDictionaryRef dict = (CFDictionaryRef)inData;
CFNumberRef reason = CFDictionaryGetValue(dict, kAudioSession_RouteChangeKey_Reason);
CFDictionaryRef oldRoute = CFDictionaryGetValue(dict, kAudioSession_AudioRouteChangeKey_PreviousRouteDescription);
CFDictionaryRef newRoute = CFDictionaryGetValue(dict, kAudioSession_AudioRouteChangeKey_CurrentRouteDescription);
NSLog(@"Audio old route: %@", oldRoute);
NSLog(@"Audio new route: %@", newRoute);
NSLog(@"=========================================");
}
}
+ (NSString*) getAudioSessionInput {
UInt32 routeSize;
AudioSessionGetPropertySize(kAudioSessionProperty_AudioRouteDescription, &routeSize);
CFDictionaryRef desc; // this is the dictionary to contain descriptions
// make the call to get the audio description and populate the desc dictionary
AudioSessionGetProperty (kAudioSessionProperty_AudioRouteDescription, &routeSize, &desc);
// the dictionary contains 2 keys, for input and output. Get output array
CFArrayRef outputs = CFDictionaryGetValue(desc, kAudioSession_AudioRouteKey_Inputs);
// the output array contains 1 element - a dictionary
CFDictionaryRef diction = CFArrayGetValueAtIndex(outputs, 0);
// get the output description from the dictionary
CFStringRef input = CFDictionaryGetValue(diction, kAudioSession_AudioRouteKey_Type);
return [NSString stringWithFormat:@"%@", input];
}
+ (NSString*) getAudioSessionOutput {
UInt32 routeSize;
AudioSessionGetPropertySize(kAudioSessionProperty_AudioRouteDescription, &routeSize);
CFDictionaryRef desc; // this is the dictionary to contain descriptions
// make the call to get the audio description and populate the desc dictionary
AudioSessionGetProperty (kAudioSessionProperty_AudioRouteDescription, &routeSize, &desc);
// the dictionary contains 2 keys, for input and output. Get output array
CFArrayRef outputs = CFDictionaryGetValue(desc, kAudioSession_AudioRouteKey_Outputs);
// the output array contains 1 element - a dictionary
CFDictionaryRef diction = CFArrayGetValueAtIndex(outputs, 0);
// get the output description from the dictionary
CFStringRef output = CFDictionaryGetValue(diction, kAudioSession_AudioRouteKey_Type);
return [NSString stringWithFormat:@"%@", output];
}
+ (NSString*) getAudioSessionRoute {
/*
returns the current session route:
* ReceiverAndMicrophone
* HeadsetInOut
* Headset
* HeadphonesAndMicrophone
* Headphone
* SpeakerAndMicrophone
* Speaker
* HeadsetBT
* LineInOut
* Lineout
* Default
*/
UInt32 rSize = sizeof (CFStringRef);
CFStringRef route;
AudioSessionGetProperty (kAudioSessionProperty_AudioRoute, &rSize, &route);
if (route == NULL) {
NSLog(@"Silent switch is currently on");
return @"None";
}
return [NSString stringWithFormat:@"%@", route];
}
@end
あなたはおそらくこれを知っていますが、スピーカーを有効にすると、電話でマイクも有効になります。ただし、iPodでは、スピーカーを有効にすると、ヘッドセットからマイクサウンドを引き出すことができます。 ProbはiPodにマイクがないので意図していません。 私は簡単に、ヘッドフォンやスピーカーの出力からマイクを得るためにios 4.3 sdkアプリを手に入れました。ルート変更後に再びAUGraphを初期化しましたが、間欠的に起こっていましたが、今は全く起こらない(ios 4.3 + xcode 4+) – zeAttle