core-audio

I'm looking for a way to mix 2 or more midi files, each with their own sound font files. I've found the following code for one file and tried to do multiple music players but i guess that shouldn't be the right approach. Also i get some weird pop sound every second. So is there any other way, maybe without the musicplayer and musicsequence methods, using only au units? Here's the code i found in another thread: -(void) playMusic:(NSString*) name { NSString *presetURLPath = [[NSBundle mainBundle] pathForResource:@"GortsMiniPianoJ1" ofType:@"SF2"]; NSURL * presetURL = [NSURL fileURLWithPath

I wrote a loop to encode pcm audio data generated by my app to aac using Extended Audio File Services. The encoding takes place in a background thread synchronously, and not in real-time. The encoding works flawlessly on ipad 1 and iphone 3gs/4 for both ios 4 and 5. However, for dual-core devices (iphone 4s, ipad 2) the third call to ExtAudioFileWrite crashes the encoding thread with no stack trace and no error code. Here is the code in question: The data formats AudioStreamBasicDescription AUCanonicalASBD(Float64 sampleRate, UInt32 channel){ AudioStreamBasicDescription audioFormat;

I am trying to connect an AudioFilePlayer AudioUnit to an AU3DMixerEmbedded Audio Unit, but I'm having no success. Here's what I'm doing: create an AUGraph with NewAUGraph() Open the graph Initalize the graph Add 3 nodes: outputNode: kAudioUnitSubType_RemoteIO mixerNode: kAudioUnitSubType_AU3DMixerEmbedded filePlayerNode: kAudioUnitSubType_AudioFilePlayer Connect the nodes: filePlayerNode -> mixerNode mixerNode -> outputNode Configure the filePlayer Audio Unit to play the required file Start the graph This doesn't work: it balks at AUGraphInitialize with error 10868 (kAudioUnitErr

I want to combine two .wav recording files together. Can any one help me figure out how to achieve this.I tried combining the data but the headers are creating problem. Can we do the combining as we do to combine the wave files. This is how i am doing the combine, NSMutableData *datas = [NSMutableData alloc]; NSData *data1 = [NSData dataWithContentsOfFile: [recordedTmpFile1 path]]; NSData *data2 = [NSData dataWithContentsOfFile: [recordedTmpFile2 path]]; NSLog(@"file1 size : %d", [data1 length]); NSLog(@"file2 size : %d", [data2 length]); [datas appendData:data1]; [datas appendData:data2];

I am currently working on an application as part of my Bachelor in Computer Science. The application will correlate data from the iPhone hardware (accelerometer, gps) and music that is being played. The project is still in its infancy, having worked on it for only 2 months. The moment that I am right now, and where I need help, is reading PCM samples from songs from the itunes library, and playing them back using and audio unit. Currently the implementation I would like working does the following: chooses a random song from iTunes, and reads samples from it when required, and stores in a

The documentation for AVPlayer states the following: [The] player works equally well with local and remote media files However, the documentation for AVAudioPlayer states the following: Apple recommends that you use this class for audio playback unless you are playing audio captured from a network stream For the work I am doing I need some of the capabilities of AVAudioPlayer, but all my audio is being streamed. The main thing I need from AVAudioPlayer that AVPlayer does not have is the "playing" property. It is difficult to build a player UI without that property, among others. So what is the

i have this code, in order to read buffer samples , but i get a strange mach-o linker error , Framework of audio unit couldnt loaded so i put the audioTollBox and coreAudio as i read. my code is : #define kOutputBus 0 #define kInputBus 1 AudioComponentInstance audioUnit; @implementation remoteIO //callback function : static OSStatus recordingCallback(void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList *ioData) { AudioBuffer buffer; buffer.mNumberChannels = 1; buffer.mDataByteSize =