I am working on audio recording. I am able to record my audio in caf (Core audio format).i followed this tutorial Recording Audio on an iPhone with AVAudioRecorder. Now I don't want to record sound in .aac format directly, I need to convert recorded .caf audio file into .aac audio file... any idea how to do this?
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface recordViewController : UIViewController
<AVAudioRecorderDelegate, AVAudioPlayerDelegate>
{
AVAudioRecorder *audioRecorder;
AVAudioPlayer *audioPlayer;
UIButton *playButton;
UIButton *recordButton;
UIButton *stopButton;
}
@property (nonatomic, retain) IBOutlet UIButton *playButton;
@property (nonatomic, retain) IBOutlet UIButton *recordButton;
@property (nonatomic, retain) IBOutlet UIButton *stopButton;
-(IBAction) recordAudio;
-(IBAction) playAudio;
-(IBAction) stop;
@end
#import "recordViewController.h"
@implementation recordViewController
@synthesize playButton, stopButton, recordButton;
- (void)viewDidLoad {
[super viewDidLoad];
playButton.enabled = NO;
stopButton.enabled = NO;
NSArray *dirPaths;
NSString *docsDir;
dirPaths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
NSString *soundFilePath = [docsDir
stringByAppendingPathComponent:@"sound.caf"];
NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];
NSDictionary *recordSettings = [NSDictionary
dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:AVAudioQualityMin],
AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16],
AVEncoderBitRateKey,
[NSNumber numberWithInt: 2],
AVNumberOfChannelsKey,
[NSNumber numberWithFloat:44100.0],
AVSampleRateKey,
nil];
NSError *error = nil;
audioRecorder = [[AVAudioRecorder alloc]
initWithURL:soundFileURL
settings:recordSettings
error:&error];
if (error)
{
NSLog(@"error: %@", [error localizedDescription]);
} else {
[audioRecorder prepareToRecord];
}
}
-(void) recordAudio
{
if (!audioRecorder.recording)
{
playButton.enabled = NO;
stopButton.enabled = YES;
[audioRecorder record];
}
}
-(void)stop
{
stopButton.enabled = NO;
playButton.enabled = YES;
recordButton.enabled = YES;
if (audioRecorder.recording)
{
[audioRecorder stop];
} else if (audioPlayer.playing) {
[audioPlayer stop];
}
}
-(void) playAudio
{
if (!audioRecorder.recording)
{
stopButton.enabled = YES;
recordButton.enabled = NO;
if (audioPlayer)
[audioPlayer release];
NSError *error;
audioPlayer = [[AVAudioPlayer alloc]
initWithContentsOfURL:audioRecorder.url
error:&error];
audioPlayer.delegate = self;
if (error)
NSLog(@"Error: %@",
[error localizedDescription]);
else
[audioPlayer play];
}
}
-(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
recordButton.enabled = YES;
stopButton.enabled = NO;
}
-(void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error
{
NSLog(@"Decode Error occurred");
}
-(void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag
{
}
-(void)audioRecorderEncodeErrorDidOccur:(AVAudioRecorder *)recorder error:(NSError *)error
{
NSLog(@"Encode Error occurred");
}
@end
Try this
step 1) I have downloaded sample TPAACAudioConverter project from https://github.com/michaeltyson/TPAACAudioConverter
step 2)AACConverterViewController.m
i have set source file and destination file format
- (IBAction)convert:(id)sender {
if ( ![TPAACAudioConverter AACConverterAvailable] ) {
[[[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Converting audio", @"")
message:NSLocalizedString(@"Couldn't convert audio: Not supported on this device", @"")
delegate:nil
cancelButtonTitle:nil
otherButtonTitles:NSLocalizedString(@"OK", @""), nil] autorelease] show];
return;
}
// Initialise audio session, and register an interruption listener, important for AAC conversion
if ( !checkResult(AudioSessionInitialize(NULL, NULL, interruptionListener, self), "initialise audio session") ) {
[[[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Converting audio", @"")
message:NSLocalizedString(@"Couldn't initialise audio session!", @"")
delegate:nil
cancelButtonTitle:nil
otherButtonTitles:NSLocalizedString(@"OK", @""), nil] autorelease] show];
return;
}
// Set up an audio session compatible with AAC conversion. Note that AAC conversion is incompatible with any session that provides mixing with other device audio.
UInt32 audioCategory = kAudioSessionCategory_MediaPlayback;
if ( !checkResult(AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(audioCategory), &audioCategory), "setup session category") ) {
[[[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Converting audio", @"")
message:NSLocalizedString(@"Couldn't setup audio category!", @"")
delegate:nil
cancelButtonTitle:nil
otherButtonTitles:NSLocalizedString(@"OK", @""), nil] autorelease] show];
return;
}
NSArray *documentsFolders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
audioConverter = [[[TPAACAudioConverter alloc] initWithDelegate:self
source:[[NSBundle mainBundle] pathForResource:@"audio" ofType:@"aiff"]
destination:[[documentsFolders objectAtIndex:0] stringByAppendingPathComponent:@"audio.m4a"]] autorelease];
((UIButton*)sender).enabled = NO;
[self.spinner startAnimating];
self.progressView.progress = 0.0;
self.progressView.hidden = NO;
[audioConverter start];
}
play converted audio
- (IBAction)playConverted:(id)sender {
if ( audioPlayer ) {
[audioPlayer stop];
[audioPlayer release];
audioPlayer = nil;
[(UIButton*)sender setTitle:@"Play converted" forState:UIControlStateNormal];
} else {
NSArray *documentsFolders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [[documentsFolders objectAtIndex:0] stringByAppendingPathComponent:@"audio.aac"];
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
[audioPlayer play];
[(UIButton*)sender setTitle:@"Stop" forState:UIControlStateNormal];
}
}
step 3)TPAACAudioConverter.m
simply i have changed audio file type find and replace kAudioFileM4AType into kAudioFileAAC_ADTSType
来源:https://stackoverflow.com/questions/18801015/iphone-how-to-convert-caf-audio-files-into-aac