IPhone之AVAudioRecorder

最新推荐文章于 2025-08-06 14:26:01 发布

转载最新推荐文章于 2025-08-06 14:26:01 发布 · 864 阅读

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本文提供了一段详细的iOS开发教程，重点介绍了如何利用AVFoundation框架实现音频录制功能，包括获取文档目录路径、初始化AVAudioRecorder对象、设置音频录制参数以及启动、暂停和停止录音的基本操作。

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           #import <AVFoundation/AVFoundation.h>  需要引入 
          
           //获取document目录的路径 
          
           - (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]; 
          
           第二个参数  settings是一个容纳键值对的NSDictionary有四种一般的键 
          
           1:一般的音频设置  
          
           2:线性PCM设置  
          
           3:编码器设置  
          
           4:采样率转换设置  
          
           NSMutableDictionary  需要加入五个设置值(线性PCM) 
          
           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]; 
          
           AVAudioRecorder成功创建后,使用他非常直接.它的三个基本方法如下 
          
           -(
           void
           ) startRecording { 
          
           [audioRecorder record]; 
          
           } 
          
           -(
           void
           ) pauseRecording { 
          
           [audioRecorder pause]; 
          
           recordPauseButton.selected = NO; 
          
           } 
          
           -(
           void
           ) stopRecording { 
          
           [audioRecorder stop];