AVAudioRecorder and AVAudioPlayer - ios

Question

It's day three and I still can't get playback. I've been following the few tutorials on AVAudioPlayer/AVAudioRecorder. Using NSFileManager it looks like a file is created, but no dice still on that playback.
RecorderViewController.m
// RecorderViewController.m
// AudioTest
//
#import "RecorderViewController.h"
#import <Foundation/Foundation.h>
#interface RecorderViewController ()
#end
#implementation RecorderViewController
#synthesize userIsRecording, filePath, activityView, recordButton, playButton, recorder;
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
*/
+ (CGRect)makeCGRectWithCenter:(CGPoint)center width:(float)width height:(float)height
{
return CGRectMake(center.x-width/2, center.y-height/2, width, height);
}
#pragma mark - Preparation
- (void)loadView
{
// RECORD BUTTON
self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
self.recordButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.recordButton.frame = [[self class] makeCGRectWithCenter:CGPointMake(self.view.frame.size.width/2, 100) width:150 height:50];
[self.recordButton setTitle:#"Record" forState:UIControlStateNormal];
[self.recordButton addTarget:self action:#selector(recordPressed) forControlEvents:UIControlEventTouchUpInside];
// PLAY BUTTON
self.playButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.playButton.frame = [[self class] makeCGRectWithCenter:CGPointMake(self.view.frame.size.width/2, 200) width:150 height:50];
[self.playButton setTitle:#"Play" forState:UIControlStateNormal];
[self.playButton addTarget:self action:#selector(playPressed) forControlEvents:UIControlEventTouchUpInside];
// RETURN BUTTON
UIButton *returnButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
returnButton.frame = [[self class] makeCGRectWithCenter:CGPointMake(self.view.frame.size.width/2, 300) width:150 height:50];
[returnButton setTitle:#"Return" forState:UIControlStateNormal];
[returnButton addTarget:self action:#selector(dismissPressed:) forControlEvents:UIControlEventTouchUpInside];
// ACTIVITY
self.activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
self.activityView.frame = [[self class] makeCGRectWithCenter:CGPointMake(self.view.frame.size.width/2, 50) width:100 height:100];
[self.view addSubview:self.recordButton];
[self.view addSubview:self.playButton];
[self.view addSubview:returnButton];
[self.view addSubview:self.activityView];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
NSLog(#"View did load");
filePath = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:#"temp2.caf"]];
// Setup AudioSession
AVAudioSession *avSession = [AVAudioSession sharedInstance];
[avSession setCategory:AVAudioSessionCategoryPlayAndRecord error:NULL];
[avSession setActive:YES error: NULL];
self.playButton.hidden = YES;
}
#pragma mark - Button Actions
- (void)dismissPressed:(id)sender
{
if ([sender isKindOfClass:[UIButton class]]) {
NSLog(#"Button class dismissed self");
}
else {
NSLog(#"Sender is:%#", [sender class]);
}
[self dismissModalViewControllerAnimated:YES];
}
- (void)stopPressed {
NSLog(#"Stop Pressed");
[self.recordButton setTitle:#"Record" forState:UIControlStateNormal];
self.userIsRecording = NO;
self.playButton.hidden = NO;
self.playButton.enabled = YES;
[self.activityView stopAnimating];
//
}
- (void)recordPressed
{
if (self.userIsRecording) {
[self stopPressed];
}
else {
self.userIsRecording = YES;
self.playButton.enabled = NO;
self.playButton.hidden = YES;
[self.recordButton setTitle:#"Stop" forState:UIControlStateNormal];
[self.activityView startAnimating];
NSDictionary *recorderSettings =
[NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:kAudioFormatLinearPCM], AVFormatIDKey,
[NSNumber numberWithInt:AVAudioQualityMin], AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16], AVEncoderBitRateKey,
[NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
[NSNumber numberWithFloat:8000.0], AVSampleRateKey,
[NSNumber numberWithInt:8], AVLinearPCMBitDepthKey, nil];
// Clean temp file
NSFileManager * fm = [NSFileManager defaultManager];
[fm removeItemAtPath:[self.filePath path] error:NULL];
// Record
NSError *error = [NSError alloc];
self.recorder = [[AVAudioRecorder alloc] initWithURL:self.filePath settings:recorderSettings error:&error];
[recorder setDelegate:self];
[recorder prepareToRecord];
if (![recorder record]) {
NSLog(#"Recorder FAIL %#", error );
}
else {
NSLog(#"Recording at %#", [self.filePath absoluteString]);
}
}
}
- (void)playPressed
{
NSFileManager * fm = [NSFileManager defaultManager];
if ([fm fileExistsAtPath:[self.filePath path]]) {
NSLog(#"File exists at:%#", [self.filePath path]);
NSDictionary *attr = [fm attributesOfItemAtPath:[self.filePath path] error:NULL];
NSLog(#"File attrs:%#", [attr description]);
}
else {
NSLog(#"ERROR: No file exists at:%#", [self.filePath path]);
}
NSError *error = [[NSError alloc] init];
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithData:[[NSData alloc] initWithContentsOfURL:self.filePath] error: &error];
[player setDelegate:self];
if (error) {
NSLog(#"Player initialization Error: %#", error);
}
if (!player) {
NSLog(#"Player is null!");
}
[player prepareToPlay];
if (![player play]) {
NSLog(#"Play Error: %#", error);
}
}
#pragma mark - Lifecycle
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
NSLog(#"View did unload");
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#end

Answer 1

[player prepareToPlay];
if (![player play]) {
NSLog(#"Play Error: %#", error);
}
You play the file right after you "prepare to play". The buffer maybe it's not still ready at that moment. Make this test. Declare AVAudioPlayer *player as global. Remove if (![player play])... from - (void)playPressed. Now create a new method that will be invoked on other button press. Press your play button, wait a couple of seconds, and press the other button.