ios錄音功能

      在iOS的基礎(chǔ)類庫中， 提供了AVFoundation FrameWork，即Audio/Video基礎(chǔ)類庫，通過使用這個類庫，可以非常容易的在應(yīng)用程序錄制，播放視頻，音頻等。

在錄制前要初始化   AVAudioRecorder *recorder;

//錄音設(shè)置

   NSMutableDictionary *recordSetting = [[[NSMutableDictionaryalloc]init] autorelease];

//設(shè)置錄音格式  AVFormatIDKey==kAudioFormatLinearPCM

   [recordSetting setValue:[NSNumbernumberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];

//設(shè)置錄音采樣率(Hz) 如：AVSampleRateKey==8000/44100/96000（影響音頻的質(zhì)量）

   [recordSetting setValue:[NSNumbernumberWithFloat:44100] forKey:AVSampleRateKey];

//錄音通道數(shù)  1 或 2

   [recordSetting setValue:[NSNumbernumberWithInt:1] forKey:AVNumberOfChannelsKey];

//線性采樣位數(shù)  8、16、24、32

   [recordSetting setValue:[NSNumbernumberWithInt:16] forKey:AVLinearPCMBitDepthKey];

//錄音的質(zhì)量

   [recordSetting setValue:[NSNumbernumberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];

NSString *strUrl = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

NSURL *url = [NSURLfileURLWithPath:[NSStringstringWithFormat:@"%@/lll.aac", strUrl]];

urlPlay = url;

NSError *error;

//初始化

recorder = [[AVAudioRecorderalloc]initWithURL:url settings:recordSetting error:&error];

//開啟音量檢測

recorder.meteringEnabled = YES;

recorder.delegate = self;

錄制完后保存

- (IBAction)btnUp:(id)sender

{

double cTime = recorder.currentTime;

if (cTime > 2) {//如果錄制時間<2 不發(fā)送

NSLog(@"發(fā)出去");

   }else {

//刪除記錄的文件

       [recorderdeleteRecording];

//刪除存儲的

   }

   [recorderstop];

   [timerinvalidate];

}