xcode:如何在使用AVFoundation录制音频后保存音频文件
xcode:如何在使用AVFoundation录制音频后保存音频文件
提问于 2012-02-22 00:00:54
我浏览了所有与这个主题相关的帖子，但是答案并没有真正的帮助。我使用这教程来实现音频文件的录制和回放。似乎缺少的是如何永久保存记录。当我退出我的应用程序时，声音文件就在那里，但里面什么都没有。我甚至不知道它是在保存rocerd还是只是创建文件。下面是一个代码示例：
NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docsDir = [dirPaths objectAtIndex:0];
NSString *soundFilePath = [docsDir
stringByAppendingPathComponent:@"tmpSound.caf"];
tempRecFile = [NSURL fileURLWithPath:soundFilePath];
NSDictionary *recSettings = [NSDictionary
dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:AVAudioQualityMin],
AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16],
AVEncoderBitRateKey,
[NSNumber numberWithInt: 2],
AVNumberOfChannelsKey,
[NSNumber numberWithFloat:44100.0],
AVSampleRateKey,
nil];
recorder = [[AVAudioRecorder alloc] initWithURL:tempRecFile settings:recSettings error:nil];
[recorder setDelegate:self];
[recorder prepareToRecord];
[recorder record];我看到了解决这个问题的可能方法，这里，但是由于我是iOS新手，所以我没有真正理解它，或者它对我没有用。
请帮助并提供一个代码示例。我阅读了关于AVFoundation和其他类的文档，但没有得到积极的结果。
SOS :)
UPDATE这是我的录音方法：
-(IBAction)recording{
//***** METHOD for recording
if(isNotRecording){
isNotRecording = NO;
[recButton setTitle:@"Stop" forState:UIControlStateNormal];
recStateLabel.text = @"Recording";
[recorder setDelegate:self];
[recorder prepareToRecord];
[recorder record];
}
else{
isNotRecording = YES;
[recButton setTitle:@"Rec Begin" forState:UIControlStateNormal];
playButton.hidden = NO;
recStateLabel.text = @"Not recording";
[recorder stop];
}
}这是我的viewDidLoad：
- (void)viewDidLoad
{
//record sound test code - start
isNotRecording = YES;
//playButton.hidden = YES;
recStateLabel.text = @"Not recording";
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[audioSession setActive:YES error:nil];
//record sound test code - END
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
// code for generating the sound file that is to be saved
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;
recorder = [[AVAudioRecorder alloc]
initWithURL:soundFileURL
settings:recordSettings
error:&error];
if (error)
{
NSLog(@"error: %@", [error localizedDescription]);
} else {
[recorder prepareToRecord];
}
}这是我的playBack方法：
-(IBAction)playback{
//AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:temporaryRecFile error:nil];
NSError *error;
// setting the uri of the formed created file
NSArray *dirPaths;
NSString *docsDir;
dirPaths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
NSString *soundFilePath = [docsDir
stringByAppendingPathComponent:@"sound.caf"];
NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];
AVAudioPlayer *player = [[AVAudioPlayer alloc]initWithContentsOfURL:soundFileURL error:&error];
[player setNumberOfLoops:0];
[player prepareToPlay];
[player setVolume:1];
[player play];
NSLog(@"URL je: %@", soundFileURL);
//method 2
if (error)
NSLog(@"Error: %@",
[error localizedDescription]);
else
{
[player play];
if(player.isPlaying==YES)
{
NSLog(@"It's playing");
}
}}
我跳š--这说明了我在做什么。有什么建议我可能错了吗？
回答 3
Stack Overflow用户
回答已采纳
发布于 2012-02-22 00:16:12
为了将数据永久保存到文件中，您需要停止记录：
[recorder stop];Stack Overflow用户
发布于 2013-07-11 20:03:07
问题是，当您告诉XCode (在viewDidLoad方法中)录制prepareToRecord时，它会删除先前录制的音频文件。删除"if“语句中的代码，当您退出并返回应用程序时，您的音频文件将被保存。
Stack Overflow用户
发布于 2013-04-22 20:12:56
FYI --“记录器prepareToRecord”方法创建一个新的音频文件，覆盖以前录制的任何文件。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/9387237
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