Control AudioSession from code - iphone

Question

In my project i have a function that play music
-(void)playPlin {
AudioSessionSetActive(true);
// Set up audio session, to prevent iPhone from deep sleeping, while playing sounds
UInt32 category = kAudioSessionCategory_MediaPlayback;
AudioSessionSetProperty (
kAudioSessionProperty_AudioCategory,
sizeof (category),
&category
);
//UInt32 category = kAudioSessionCategory_MediaPlayback;
OSStatus result = AudioSessionSetProperty(kAudioSessionProperty_AudioCategory,
sizeof(category), &category);
if (result){
NSLog(#"ERROR SETTING AUDIO CATEGORY!\n");
}
result = AudioSessionSetActive(true);
if (result) {
NSLog(#"ERROR SETTING AUDIO SESSION ACTIVE!\n");
}
NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:#"chimes" ofType:#"wav"];
NSData *sampleData = [[NSData alloc] initWithContentsOfFile:soundFilePath];
NSError *audioError = nil;
AVAudioPlayer *alarmAudioPlayer = [[AVAudioPlayer alloc] initWithData:sampleData error:&audioError];
[sampleData release];
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: nil];
if(audioError != nil) {
NSLog(#"An audio error occurred: \"%#\"", audioError);
}
else {
[alarmAudioPlayer play];
} }
The file play ok but i have three issue:
1.how can I make that the audio file starts not from the beginning but from the number of second that i pass? for example, if i step value 300 audio file should start from the second 300 of it
2.How can i set volume of audio file?
3.How can i set loop property of it?
thank in advance

Answer 1

This is all pretty clearly laid out in the documentation.
1) Use the playAtTime: method call instead of play. Pass the time in seconds.
2) Set the volume property on the AVAudioPlayer. Note that this is the gain of the player, and will be modulated with the current system volume.
3) Set the numberOfLoops property. Assign a huge value like NSIntegerMax to keep looping indefinitely.