the amazing audio engine how to apply filters to microphone input
Im trying to make karaoke app that records the background music from file and the microphone. I also want to add filter effects to the microphone input.
i can do everything stated above using the amazing audio engine sdk but i cant figure out how to add the microphone input as a channel so i can apply filters to it (and not to the background music.)
any help would be appreciated.
my current recording code:
- (void)beginRecording {
// Init recorder
self.recorder = [[AERecorder alloc] initWithAudioController:_audioController];
NSString *documentsFolder = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)
objectAtIndex:0];
NSString *filePath = [documentsFolder stringByAppendingPathComponent:@"Recording.aiff"];
// Start the recording process
NSError *error = NULL;
if ( ![_recorder beginRecordingToFileAtPath:filePath
fileType:kAudioFileAIFFType
error:&error] ) {
// Report error
return;
}
// Receive both audio input and audio output. Note that if you're using
// AEPlaythroughChannel, mentioned above, you may not need to receive the input again.
[_audioController addInputReceiver:_recorder];
[_audioController addOutputReceiver:_recorder];
}
You can separate your your back ground music and your mic by using different channels and then you can apply the filter to your mic channel only.
first declare a channel group in the header file
AEChannelGroupRef _group;
then simply add the player that you are using for recorded file to this group
[_audioController addChannels:@[_player] toChannelGroup:_group ];
and then add the filter to this group only
[_audioController addFilter:_reverb toChannelGroup:_group];
self.reverb = [[[AEAudioUnitFilter alloc] initWithComponentDescription:AEAudioComponentDescriptionMake(kAudioUnitManufacturer_Apple, kAudioUnitType_Effect, kAudioUnitSubType_Reverb2) audioController:_audioController error:NULL] autorelease];
AudioUnitSetParameter(_reverb.audioUnit, kReverb2Param_DryWetMix, kAudioUnitScope_Global, 0, 100.f, 0);
[_audioController addFilter:_reverb];
您可以在播放录制的音频时应用滤镜。
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