SimpleAudioRecording

Recorder.h

//
//  Recorder.h
//
//  Created by Ariel Elkin on 14/05/2012.
//

#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>

@interface NarrationManager : NSObject

-(void)startRecording:(int)page;
-(void)stopRecording;

-(void)playRecording:(int)page;
-(void)stopPlaying;

@end

Recorder.m

//
//  Recorder.m
//
//  Created by Ariel Elkin on 14/05/2012.
//

#import "NarrationManager.h"


@implementation NarrationManager

AVAudioRecorder *recorder = nil;
AVAudioPlayer *player = nil;

-(void)startRecording:(int)i {
    
    NSLog(@"startRecording");
    recorder = nil;

    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    [audioSession setCategory:AVAudioSessionCategoryRecord error:nil];

    NSMutableDictionary *recordSettings = [[NSMutableDictionary alloc] initWithCapacity:10];
    [recordSettings setObject:[NSNumber numberWithInt: kAudioFormatLinearPCM] forKey: AVFormatIDKey];
    [recordSettings setObject:[NSNumber numberWithFloat:44100.0] forKey: AVSampleRateKey];
    [recordSettings setObject:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
    [recordSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
    [recordSettings setObject:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
    [recordSettings setObject:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];   
    
    
    NSString *urlString = [[NSHomeDirectory() stringByAppendingString:@"/Documents/"] stringByAppendingString:@"recordTest.caf"];
    
    NSURL *url = [NSURL fileURLWithPath:urlString];
    
    
    NSLog(@"Created url at %@", url);


    NSError *error = nil;
    recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recordSettings error:&error];

    bool b = [recorder prepareToRecord];

    if(!b){
        NSLog(@"can't prepare recording");
        return;
    }
    if(error != nil) {
        NSLog(@"Error: %@", error);
        return;
    }
    else {
        [recorder record];
        NSLog(@"recording");   
    }      
}

-(void)stopRecording {
    if(recorder.recording){
        [recorder stop];
        NSLog(@"stopped recording");
    }
    else{
        NSLog(@"recorder not recording");
    }    
}

-(void) playRecording:(int) page {
    NSLog(@"playRecording");
    // Init audio with playback capability
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
    
    NSString *urlString = [[NSHomeDirectory() stringByAppendingString:@"/Documents/"] stringByAppendingString:@"recordTest.caf"];
    
    NSURL *url = [NSURL fileURLWithPath:urlString];
    
    NSLog(@"trying to play %@", url);
    NSError *error;
    
    player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
    
    if(error != nil){
        NSLog(@"PLAY ERROR: %@", error);
        return;
    } else{
        player.numberOfLoops = 0;
        [player play];
        NSLog(@"playing");
    }
}
-(void)stopPlaying{
    [player stop];
    NSLog(@"stopped");
}

@end