Classes/avTouchController.mm

  /*
 
    File: avTouchController.mm
Abstract: VBase app controller class
 Version: 1.4.3
 
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*/
 
#import "avTouchController.h"
#include "CALevelMeter.h"
 
// amount to skip on rewind or fast forward
#define SKIP_TIME 1.0           
// amount to play between skips
#define SKIP_INTERVAL .2
 
@implementation avTouchController
 
@synthesize fileName;
@synthesize playButton;
@synthesize ffwButton;
@synthesize rewButton;
@synthesize volumeSlider;
@synthesize progressBar;
@synthesize currentTime;
@synthesize duration;
@synthesize lvlMeter_in;
 
@synthesize updateTimer;
 
@synthesize inBackground;
 
@synthesize player;
 
void RouteChangeListener(   void *                  inClientData,
                            AudioSessionPropertyID  inID,
                            UInt32                  inDataSize,
                            const void *            inData);
                                                            
-(void)updateCurrentTimeForPlayer:(AVAudioPlayer *)p
{
    currentTime.text = [NSString stringWithFormat:@"%d:%02d", (int)p.currentTime / 60, (int)p.currentTime % 60, nil];
    progressBar.value = p.currentTime;
}
 
- (void)updateCurrentTime
{
    [self updateCurrentTimeForPlayer:self.player];
}
 
- (void)updateViewForPlayerState:(AVAudioPlayer *)p
{
    [self updateCurrentTimeForPlayer:p];
 
    if (updateTimer) 
        [updateTimer invalidate];
        
    if (p.playing)
    {
        [playButton setImage:((p.playing == YES) ? pauseBtnBG : playBtnBG) forState:UIControlStateNormal];
        [lvlMeter_in setPlayer:p];
        updateTimer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(updateCurrentTime) userInfo:p repeats:YES];
    }
    else
    {
        [playButton setImage:((p.playing == YES) ? pauseBtnBG : playBtnBG) forState:UIControlStateNormal];
        [lvlMeter_in setPlayer:nil];
        updateTimer = nil;
    }
    
}
 
- (void)updateViewForPlayerStateInBackground:(AVAudioPlayer *)p
{
    [self updateCurrentTimeForPlayer:p];
    
    if (p.playing)
    {
        [playButton setImage:((p.playing == YES) ? pauseBtnBG : playBtnBG) forState:UIControlStateNormal];
    }
    else
    {
        [playButton setImage:((p.playing == YES) ? pauseBtnBG : playBtnBG) forState:UIControlStateNormal];
    }   
}
 
-(void)updateViewForPlayerInfo:(AVAudioPlayer*)p
{
    duration.text = [NSString stringWithFormat:@"%d:%02d", (int)p.duration / 60, (int)p.duration % 60, nil];
    progressBar.maximumValue = p.duration;
    volumeSlider.value = p.volume;
}
 
- (void)rewind
{
    AVAudioPlayer *p = rewTimer.userInfo;
    p.currentTime-= SKIP_TIME;
    [self updateCurrentTimeForPlayer:p];
}
 
- (void)ffwd
{
    AVAudioPlayer *p = ffwTimer.userInfo;
    p.currentTime+= SKIP_TIME;  
    [self updateCurrentTimeForPlayer:p];
}
 
- (void)awakeFromNib
{
    playBtnBG = [[UIImage imageNamed:@"play.png"] retain];
    pauseBtnBG = [[UIImage imageNamed:@"pause.png"] retain];
 
    [playButton setImage:playBtnBG forState:UIControlStateNormal];
    
    [self registerForBackgroundNotifications];
            
    updateTimer = nil;
    rewTimer = nil;
    ffwTimer = nil;
    
    duration.adjustsFontSizeToFitWidth = YES;
    currentTime.adjustsFontSizeToFitWidth = YES;
    progressBar.minimumValue = 0.0; 
    
    // Load the the sample file, use mono or stero sample
    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: [[NSBundle mainBundle] pathForResource:@"sample" ofType:@"m4a"]];
    //NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: [[NSBundle mainBundle] pathForResource:@"sample2ch" ofType:@"m4a"]];
 
    player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
    
    if (self.player != nil) {
        fileName.text = [NSString stringWithFormat: @"%@ (%d ch.)", [[player.url relativePath] lastPathComponent], player.numberOfChannels, nil];
        [self updateViewForPlayerInfo:player];
        [self updateViewForPlayerState:player];
        player.numberOfLoops = 1;
        player.delegate = self;
    }
    
    [[AVAudioSession sharedInstance] setDelegate: self];
    
    NSError *setCategoryError = nil;
    
    [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: &setCategoryError];
    if (setCategoryError) NSLog(@"Error setting category! %d", setCategoryError.code);
    
    // we don't do anything special in the route change notification
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(handleRouteChange:)
                                                 name:AVAudioSessionRouteChangeNotification
                                               object:nil];
    
    [fileURL release];
}
 
-(void)pausePlaybackForPlayer:(AVAudioPlayer*)p
{
    [p pause];
    [self updateViewForPlayerState:p];
}
 
-(void)startPlaybackForPlayer:(AVAudioPlayer*)p
{
    if ([p play])
    {
        [self updateViewForPlayerState:p];
    }
    else
        NSLog(@"Could not play %@\n", p.url);
}
 
- (IBAction)playButtonPressed:(UIButton *)sender
{
    if (player.playing == YES)
        [self pausePlaybackForPlayer: player];
    else
        [self startPlaybackForPlayer: player];
}
 
- (IBAction)rewButtonPressed:(UIButton *)sender
{
    if (rewTimer) [rewTimer invalidate];
    rewTimer = [NSTimer scheduledTimerWithTimeInterval:SKIP_INTERVAL target:self selector:@selector(rewind) userInfo:player repeats:YES];
}
 
- (IBAction)rewButtonReleased:(UIButton *)sender
{
    if (rewTimer) [rewTimer invalidate];
    rewTimer = nil;
}
 
- (IBAction)ffwButtonPressed:(UIButton *)sender
{
    if (ffwTimer) [ffwTimer invalidate];
    ffwTimer = [NSTimer scheduledTimerWithTimeInterval:SKIP_INTERVAL target:self selector:@selector(ffwd) userInfo:player repeats:YES];
}
 
- (IBAction)ffwButtonReleased:(UIButton *)sender
{
    if (ffwTimer) [ffwTimer invalidate];
    ffwTimer = nil;
}
 
- (IBAction)volumeSliderMoved:(UISlider *)sender
{
    player.volume = [sender value];
}
 
- (IBAction)progressSliderMoved:(UISlider *)sender
{
    player.currentTime = sender.value;
    [self updateCurrentTimeForPlayer:player];
}
 
- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
 
    [super dealloc];
    
    [fileName release];
    [playButton release];
    [ffwButton release];
    [rewButton release];
    [volumeSlider release];
    [progressBar release];
    [currentTime release];
    [duration release];
    [lvlMeter_in release];
    
    [updateTimer release];
    [player release];
    
    [playBtnBG release];
    [pauseBtnBG release];   
}
 
#pragma mark AVAudioSession notification handlers
 
- (void)handleRouteChange:(NSNotification *)notification
{
    UInt8 reasonValue = [[notification.userInfo valueForKey:AVAudioSessionRouteChangeReasonKey] intValue];
    AVAudioSessionRouteDescription *routeDescription = [notification.userInfo valueForKey:AVAudioSessionRouteChangePreviousRouteKey];
    
    NSLog(@"Route change:");
    switch (reasonValue) {
        case AVAudioSessionRouteChangeReasonNewDeviceAvailable:
            NSLog(@"     NewDeviceAvailable");
            break;
        case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:
            [self pausePlaybackForPlayer:player];
            NSLog(@"     OldDeviceUnavailable");
            break;
        case AVAudioSessionRouteChangeReasonCategoryChange:
            NSLog(@"     CategoryChange");
            NSLog(@" New Category: %@", [[AVAudioSession sharedInstance] category]);
            break;
        case AVAudioSessionRouteChangeReasonOverride:
            NSLog(@"     Override");
            break;
        case AVAudioSessionRouteChangeReasonWakeFromSleep:
            NSLog(@"     WakeFromSleep");
            break;
        case AVAudioSessionRouteChangeReasonNoSuitableRouteForCategory:
            NSLog(@"     NoSuitableRouteForCategory");
            break;
        default:
            NSLog(@"     ReasonUnknown");
    }
    
    NSLog(@"Previous route:\n");
    NSLog(@"%@", routeDescription);
}
 
#pragma mark AVAudioPlayer delegate methods
 
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)p successfully:(BOOL)flag
{
    if (flag == NO)
        NSLog(@"Playback finished unsuccessfully");
        
    [p setCurrentTime:0.];
    if (inBackground)
    {
        [self updateViewForPlayerStateInBackground:p];
    }
    else
    {
        [self updateViewForPlayerState:p];
    }
}
 
- (void)playerDecodeErrorDidOccur:(AVAudioPlayer *)p error:(NSError *)error
{
    NSLog(@"ERROR IN DECODE: %@\n", error); 
}
 
// we will only get these notifications if playback was interrupted
- (void)audioPlayerBeginInterruption:(AVAudioPlayer *)p
{
    NSLog(@"Interruption begin. Updating UI for new state");
    // the object has already been paused,  we just need to update UI
    if (inBackground) {
        [self updateViewForPlayerStateInBackground:p];
    } else {
        [self updateViewForPlayerState:p];
    }
}
 
- (void)audioPlayerEndInterruption:(AVAudioPlayer *)p
{
    NSLog(@"Interruption ended. Resuming playback");
    [self startPlaybackForPlayer:p];
}
 
#pragma mark background notifications
- (void)registerForBackgroundNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(setInBackgroundFlag)
                                                 name:UIApplicationWillResignActiveNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(clearInBackgroundFlag)
                                                 name:UIApplicationWillEnterForegroundNotification
                                               object:nil];
}
 
- (void)setInBackgroundFlag
{
    inBackground = true;
}
 
- (void)clearInBackgroundFlag
{
    inBackground = false;
}
 
@end


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