I've a bit of code which was working fine with iOS 4.3. I had a look on the Internet, I found others having the same problem without answer which worked for me. I think that I can record something but I cannot play it. Here is my code:
DetailViewController.h
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreAudio/CoreAudioTypes.h>
#import <AudioToolbox/AudioServices.h>
@interface DetailViewController : UIViewController <UISplitViewControllerDelegate, AVAudioRecorderDelegate> {
id detailItem;
UILabel *detailDescriptionLabel;
IBOutlet UIButton *btnStart;
IBOutlet UIButton *btnPlay;
//Variables setup for access in the class:
NSURL * recordedTmpFile;
AVAudioRecorder * recorder;
BOOL toggle;
}
// Needed properties
@property (nonatomic, retain) IBOutlet UIButton *btnStart;
@property (nonatomic, retain) IBOutlet UIButton *btnPlay;
@property (strong, nonatomic) id detailItem;
@property (strong, nonatomic) IBOutlet UILabel *detailDescriptionLabel;
-(IBAction) start_button_pressed;
-(IBAction) play_button_pressed;
@end
DetailViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
toggle = YES;
btnPlay.hidden = YES;
NSError *error;
// Create the Audio Session
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
// Set up the type of session
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];
// Activate the session.
[audioSession setActive:YES error:&error];
[self configureView];
}
-(IBAction) start_button_pressed{
if (toggle) {
toggle = NO;
[btnStart setTitle:@"Press to stop recording" forState:UIControlStateNormal];
btnPlay.enabled = toggle;
btnPlay.hidden = !toggle;
NSError *error;
NSMutableDictionary *recordSettings = [[NSMutableDictionary alloc] init];
[recordSettings setValue:[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];
[recordSettings setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
[recordSettings setValue:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
// Create a temporary files to save the recording.
recordedTmpFile = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat: @"%.0f.%@", [NSDate timeIntervalSinceReferenceDate] * 1000.0, @"caf"]]];
NSLog(@"The temporary file used is: %@", recordedTmpFile);
recorder = [[AVAudioRecorder alloc] initWithURL:recordedTmpFile settings:recordSettings error:&error];
[recorder setDelegate:self];
[recorder prepareToRecord];
[recorder record];
}
else {
toggle = YES;
[btnStart setTitle:@"Start recording" forState:UIControlStateNormal];
btnPlay.hidden = !toggle;
btnPlay.enabled = toggle;
NSLog(@"Recording stopped and saved in file: %@", recordedTmpFile);
[recorder stop];
}
}
-(IBAction) play_button_pressed{
NSError *error;
AVAudioPlayer * avPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:recordedTmpFile error:&error];
if (!error)
{
[avPlayer prepareToPlay];
[avPlayer play];
NSLog(@"File is playing");
}
}
- (void) audioPlayerDidFinishPlaying: (AVAudioPlayer *) player
successfully: (BOOL) flag {
NSLog (@"audioPlayerDidFinishPlaying:successfully:");
}
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *) aRecorder successfully: (BOOL)flag
{
NSLog (@"audioRecorderDidFinishRecording:successfully:");
}
Here is the of my program running:
2011-11-25 11:58:02.005 Bluetooth1[897:707] The temporary file used is: file://localhost/private/var/mobile/Applications/D81023F8-C53D-4AC4-B1F7-14D66EB4844A/tmp/343915082005.caf 2011-11-25 11:58:05.956 Bluetooth1[897:707] Recording stopped and saved in file: file://localhost/private/var/mobile/Applications/D81023F8-C53D-4AC4-B1F7-14D66EB4844A/tmp/343915082005.caf 2011-11-25 11:58:05.998 Bluetooth1[897:707] audioRecorderDidFinishRecording:successfully: 2011-11-25 11:58:11.785 Bluetooth1[897:707] File is playing
For some reason, the function audioPlayerDidFinishPlaying is never called. However it seems that something has been recorded. Right now I do not know which part is not working but I guess this has something to do with AVAudioPlayer.
[EDIT] It's getting weirder and weirder. I wanted to make sure that something was recorded so I look for taking the duration of the record. Here is the new play function:
-(IBAction) play_button_pressed{
NSError *error;
AVAudioPlayer * avPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: recordedTmpFile error:&error];
if (!error)
{
AVURLAsset* audioAsset = [AVURLAsset URLAssetWithURL:recordedTmpFile options:nil];
CMTime audioDuration = audioAsset.duration;
float audioDurationSeconds = CMTimeGetSeconds(audioDuration);
[avPlayer prepareToPlay];
[avPlayer play];
NSString *something = [NSString stringWithFormat:@"%f",audioDurationSeconds];
NSLog(@"File is playing: %@", something);
}
else
{
NSLog(@"Error playing.");
}
}
Now, the length of the record is recorded and it make sense (if I record for 10s it shows something around 10s). However, when I put these lines of code for the first time I forgot to do the conversion float to NSString. So it crashed... and the app play the sound... After different tests I can conclude that my app can record and play a sound but is as to crash to play the recorded sound. I've no idea what can be the problem. I found that AVPlayer is asynchronous, is their something to do with that? I'm completely lost...
OK, that is not really cool to answer you own questions. Moreover when the answer is not clean but it is working... In order to play what I have recorded I have used the following block of code:
AVURLAsset* audioAsset = [AVURLAsset URLAssetWithURL:recordedTmpFile options:nil];
CMTime audioDuration = audioAsset.duration;
float audioDurationSeconds = CMTimeGetSeconds(audioDuration);
[avPlayer prepareToPlay];
[avPlayer play];
// Block for audioDurationSeconds seconds
[NSThread sleepForTimeInterval:audioDurationSeconds];
I am calculating the length of the recorded file and I am waiting for this amount of time... it is dirty but it is doing the trick. Plus, if it launched in another thread it will not block the application.
I anyone has something I would gladly take it!