录音，

1，初始化 AVAudioSession

 class="s2">//7.0第一次运行会提示，是否允许使用麦克风

       
AVAudioSession *session = [AVAudioSessionclass="s4">sharedInstance];

        NSError
*sessionError;

       
//AVAudioSessionCategoryPlayAndRecord用于录音和播放

        [session class="s4">setCategory:class="s5">AVAudioSessionCategoryPlayAndRecord class="s4">error:&sessionError];

        if(session ==
nil)

            class="s4">NSLog(@"Error creating session: %@",
[sessionError description]);

        else

            [session setActive:class="s7">YES error:class="s7">nil];

2，生成目录

    class="s2">NSString *docDir =
[NSSearchPathForDirectoriesInDomainsclass="s1">(NSDocumentDirectory,
NSUserDomainMask, class="s3">YES) objectAtIndexclass="s1">:0];

    playName = [class="s2">NSString stringWithFormat:@"%@/play.aac",docDir];

3，录制

   class="s2">recorder = [[class="s3">AVAudioRecorderalloc] initWithURLclass="s1">:[NSURLURLWithStringclass="s1">:playName]
settings:class="s2">recorderSettingsDicterrorclass="s1">:&error];

        if (class="s2">recorder) {

            class="s2">recorder.meteringEnabled = class="s4">YES;

            [class="s2">recorder prepareToRecord];

            [class="s2">recorder record];

4，播放

  class="s2">player = [[class="s3">AVAudioPlayeralloc]
initWithContentsOfURL:[class="s3">NSURLURLWithString:class="s2">playName] errorclass="s1">:&playerError];

    if (class="s2">player == nil)

    {

        NSLogclass="s1">(@"ERror creating player: %@", [playerError
description]);

    }else{

        [player class="s5">play];

    }

ps:好像AVAudioSession 与class="s3">AVAudioRecorder， class="s3">AVAudioPlayer没有什么关系，代码之间看不到，

a,设置：

//录音设置
NSMutableDictionary *recordSetting = [[[NSMutableDictionary
alloc]init] autorelease];
//设置录音格式
AVFormatIDKey==kAudioFormatLinearPCM
[recordSetting setValue:[NSNumber
numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
//设置录音采样率(Hz)
如：AVSampleRateKey==8000/44100/96000（影响音频的质量）
[recordSetting
setValue:[NSNumber numberWithFloat:44100] forKey:AVSampleRateKey];

//录音通道数 1 或 2
[recordSetting setValue:[NSNumber numberWithInt:1]
forKey:AVNumberOfChannelsKey];
//线性采样位数 8、16、24、32
[recordSetting
setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];

//录音的质量
[recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh]
forKey:AVEncoderAudioQualityKey];
//要找的文件路径
NSString *strUrl =
[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)
lastObject];
//创建存储的文件夹
NSURL *url = [NSURL fileURLWithPath:[NSString
stringWithFormat:@"%@/lll.aac", strUrl]];
urlPlay =
url;//获得播放路径
NSLog(@"录音的路径为：%@",strUrl);

NSLog(@"录音====路径：%@",url);
NSError *error;
//初始化
recorder =
[[AVAudioRecorder alloc]initWithURL:url settings:recordSetting
error:&error];

//开启音量检测
recorder.meteringEnabled = YES;

recorder.delegate = self;

b,启动，时间限制，

- (IBAction)btnDown:(id)sender
{

//创建录音文件，准备录音
if ([recorder
prepareToRecord]) {
//开始
[recorder record];
}


//设置定时检测
timer = [NSTimer scheduledTimerWithTimeInterval:0 target:self
selector:@selector(detectionVoice) userInfo:nil repeats:YES];

}

- (IBAction)btnUp:(id)sender
{
>double cTime =
recorder.currentTime;
if
(cTime > 2) {//如果录制时间<2 不发送

[mainRecorder recordForDuration:60.0];//设置录音时限60秒,该方法自动执行prepareToRecord

NSLog(@"发出去");
}else {
//删除记录的文件
[recorder
deleteRecording];
//删除存储的
}
[recorder stop];
[timer
invalidate];//移除计时器
}
- (IBAction)btnDragUp:(id)sender
{

//删除录制文件
[recorder deleteRecording];
[recorder stop];
[timer
invalidate];

NSLog(@"取消发送");
}