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技術社區[雲棲]
IPhone之AVAudioRecorder
#import <AVFoundation/AVFoundation.h> 需要引入//獲取document目錄的路徑
- (NSString*) documentsPath {
if (! _documentsPath) {
NSArray *searchPaths =
NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
_documentsPath = [searchPaths objectAtIndex: 0];
[_documentsPath retain];
}
return _documentsPath;
}
//(document目錄的路徑)
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];
第二個參數 settings是一個容納鍵值對的NSDictionary有四種一般的鍵
1:一般的音頻設置
2:線性PCM設置
3:編碼器設置
4:采樣率轉換設置
NSMutableDictionary 需要加入五個設置值(線性PCM)
NSMutableDictionary *recordSettings =
[[NSMutableDictionary alloc] initWithCapacity:10];
//1 ID號
[recordSettings setObject:
[NSNumber numberWithInt: kAudioFormatLinearPCM] forKey: AVFormatIDKey];
float sampleRate =
[pcmSettingsViewController.sampleRateField.text floatValue];
//2 采樣率
[recordSettings setObject:
[NSNumber numberWithFloat:sampleRate] forKey: AVSampleRateKey];
//3 通道的數目
[recordSettings setObject:
[NSNumber numberWithInt:
(pcmSettingsViewController.stereoSwitch.on ? 2 : 1)]
forKey:AVNumberOfChannelsKey];
int bitDepth =
[pcmSettingsViewController.sampleDepthField.text intValue];
//4 采樣位數 默認 16
[recordSettings setObject:
[NSNumber numberWithInt:bitDepth] forKey:AVLinearPCMBitDepthKey];
//5
[recordSettings setObject:
[NSNumber numberWithBool:
pcmSettingsViewController.bigEndianSwitch.on]
forKey:AVLinearPCMIsBigEndianKey];
//6 采樣信號是整數還是浮點數
[recordSettings setObject:
[NSNumber numberWithBool:
pcmSettingsViewController.floatingSamplesSwitch.on]
forKey:AVLinearPCMIsFloatKey]
;
AVAudioRecorder成功創建後,使用他非常直接.它的三個基本方法如下
-(void) startRecording {
[audioRecorder record];
}
-(void) pauseRecording {
[audioRecorder pause];
recordPauseButton.selected = NO;
}
-(void) stopRecording {
[audioRecorder stop];
}
最後更新：2017-04-02 06:52:04