IPhone之AVAudioRecorder

//获取document目录的路径
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- (NSString*) documentsPath {
if (! _documentsPath) {
NSArray *searchPaths =
NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
_documentsPath = [searchPaths objectAtIndex: 0];
[_documentsPath retain];
}
return _documentsPath;
}

//(document目录的路径)
NSString *destinationString = [[self documentsPath]
stringByAppendingPathComponent:filenameField.text];
NSURL *destinationURL = [NSURL fileURLWithPath: destinationString];
//初始化AVAudioRecorder
NSError *recorderSetupError = nil;
AVAudioRecorder audioRecorder = [[AVAudioRecorder alloc] initWithURL:destinationURL
settings:recordSettings error:&recorderSetupError];
[recordSettings release];

NSMutableDictionary *recordSettings =
[[NSMutableDictionary alloc] initWithCapacity:10];
//1 ID号
[recordSettings setObject:
[NSNumber numberWithInt: kAudioFormatLinearPCM] forKey: AVFormatIDKey];
float sampleRate =
[pcmSettingsViewController.sampleRateField.text floatValue];
//2 采样率
[recordSettings setObject:
[NSNumber numberWithFloat:sampleRate] forKey: AVSampleRateKey];

//3 通道的数目
[recordSettings setObject:
[NSNumber numberWithInt:
(pcmSettingsViewController.stereoSwitch.on ? 2 : 1)]
forKey:AVNumberOfChannelsKey];
int bitDepth =
[pcmSettingsViewController.sampleDepthField.text intValue];

//4 采样位数  默认 16
[recordSettings setObject:
[NSNumber numberWithInt:bitDepth] forKey:AVLinearPCMBitDepthKey];

//5
[recordSettings setObject:
[NSNumber numberWithBool:
pcmSettingsViewController.bigEndianSwitch.on]
forKey:AVLinearPCMIsBigEndianKey];

//6 采样信号是整数还是浮点数
[recordSettings setObject:
[NSNumber numberWithBool:
pcmSettingsViewController.floatingSamplesSwitch.on]
forKey:AVLinearPCMIsFloatKey]

;

-(void) startRecording {
[audioRecorder record];
}
-(void) pauseRecording {
[audioRecorder pause];
recordPauseButton.selected = NO;
}
-(void) stopRecording {
[audioRecorder stop];
}