iOS录音方法实用详解

本文将涉及到以下内容：

一、搭建长按录音ui效果；

二、使用avaudiorecorder录音；

三、使用avaudioplayer播放，并添加播放动画；

四、使用lame将caf音频转化为mp3;

五、将mp3 转化为 base64编码；

六、查看录音文件大小；

七、删除语音文件；

 

--------------------------

 

一、搭建长按录音ui效果；

页面样式效果如下：

其中：

1、录音按钮是由两个uiimageview实现，监听手势方法，长按第一层uiimageview时，第二层开始旋转动画；

这里我想过用uibutton来实现点击录音效果，其中uicontroleventtouchdown可以检测点击下去的效果，uicontroleventtouchupinside可以检测点击后起来的效果，但是测试点击下去后，没有直接起来，而是将手指移动到其他位置，导致录音无法关闭，所以，还是使用了长按手势来监听。

2、其他控件比较简单。

 

核心代码

1、长按启动录音；

 

- (uiimageview *)recordbtn
{
    
    if (!_recordbtn) {
        _recordbtn = [[uiimageview alloc]init];
        _recordbtn.backgroundcolor = [uicolor clearcolor];
        
        [_recordbtn setimage:[uiimage imagenamed:@"record_norm"]];
        _recordbtn.userinteractionenabled = yes;//方便添加长按手势
    }
    
    return _recordbtn;
}

self.recordbtn.frame = cgrectmake((kscreen_width - btnh)*0.5, cgrectgetmaxy(self.timelabel.frame) + margin, btnh, btnh);
        self.recordbtn.layer.cornerradius = self.recordbtn.frame.size.width * 0.5;
        
        [self.recordbtn.layer setmaskstobounds:yes];
        //        [self.recordbtn addtarget:self action:@selector(recordnotice) forcontrolevents:uicontroleventtouchdown];
        //        [self.recordbtn addtarget:self action:@selector(stopnotice) forcontrolevents:uicontroleventtouchupinside];
        
        //实例化长按手势监听
        uilongpressgesturerecognizer *longpress = [[uilongpressgesturerecognizer alloc] initwithtarget:self action:@selector(handletableviewcelllongpressed:)];
        
        //代理
        longpress.delegate = self;
        longpress.minimumpressduration = 0.5;
        [self.recordbtn addgesturerecognizer:longpress];

//长按事件的实现方法

- (void) handletableviewcelllongpressed:(uilongpressgesturerecognizer *)gesturerecognizer {
    
    if (gesturerecognizer.state ==  uigesturerecognizerstatebegan) {
        
        nslog(@"uigesturerecognizerstatebegan");
        [self startrecordnotice];
        
    }
    
    if (gesturerecognizer.state == uigesturerecognizerstatechanged) {
        
    }
    
    if (gesturerecognizer.state == uigesturerecognizerstateended) {
        
        nslog(@"uigesturerecognizerstateended");
        [self stoprecordnotice];
        
    }
    
}

2、录音过程中，录音外圈旋转效果

1）初始化

-(uiimageview *)rotateimgview
{
    if (!_rotateimgview) {
        _rotateimgview = [[uiimageview alloc]init];
        _rotateimgview.image = [uiimage imagenamed:@"rcirle_norm"];
        _rotateimgview.frame = cgrectmake(0, 0, btnh, btnh);
        _rotateimgview.center = self.recordbtn.center;
 }
    return _rotateimgview;
}

2）动画设置

// 执行动画
- (void)staranimalwithtime:(cftimeinterval)time  //time为旋转一周的时间
{
    self.rotateimgview.image = [uiimage imagenamed:@"rcirle_high"];
    
    self.rotationanimation = [cabasicanimation animationwithkeypath:@"transform.rotation.z"];
    self.rotationanimation.tovalue = [nsnumber numberwithfloat: m_pi * 2.0 ];
    self.rotationanimation.duration = time;
    self.rotationanimation.cumulative = yes;
    self.rotationanimation.repeatcount = huge_valf;
    
    [self.rotateimgview.layer addanimation:self.rotationanimation forkey:@"rotationanimation"];
}

 

3、播放时的动画效果

1）动画设置

#pragma mark - 动画效果

- (void)picturechangeanimationsetting
{
    nsarray *picarray = @[[uiimage imagenamed:@"voice1"],
                          [uiimage imagenamed:@"voice2"],
                          [uiimage imagenamed:@"voice3"],];
    
    //    self.imageview.image = [uiimage imagenamed:@"voice1"];
    
    
    //imageview的动画图片是数组images
    self.voiceview.animationimages = picarray;
    //按照原始比例缩放图片，保持纵横比
    self.voiceview.contentmode = uiviewcontentmodescaleaspectfit;
    //切换动作的时间3秒，来控制图像显示的速度有多快，
    self.voiceview.animationduration = 1;
    //动画的重复次数，想让它无限循环就赋成0
    self.voiceview.animationrepeatcount = 0;
    
}

2）开启动画

[self.voiceview startanimating];

 

3）关闭动画

 [self.voiceview.layer removeallanimations];
    self.voiceview.image = [uiimage imagenamed:@"voice3"];

二、使用avaudiorecorder录音；

 

#pragma mark -  getter
/**
 *  获得录音机对象
 *
 *  @return 录音机对象
 */
-(avaudiorecorder *)audiorecorder{
    if (!_audiorecorder) {
        //创建录音文件保存路径
        nsurl *url=[nsurl urlwithstring:self.cafpathstr];
        //创建录音格式设置
        nsdictionary *setting=[self getaudiosetting];
        //创建录音机
        nserror *error=nil;
        
        _audiorecorder=[[avaudiorecorder alloc]initwithurl:url settings:setting error:&error];
        _audiorecorder.delegate=self;
        _audiorecorder.meteringenabled=yes;//如果要监控声波则必须设置为yes
        if (error) {
            nslog(@"创建录音机对象时发生错误，错误信息：%@",error.localizeddescription);
            return nil;
        }
    }
    return _audiorecorder;
}

/**
 *  取得录音文件设置
 *
 *  @return 录音设置
 */
-(nsdictionary *)getaudiosetting{
    //linearpcm 是ios的一种无损编码格式,但是体积较为庞大
    //录音设置
    nsmutabledictionary *recordsettings = [[nsmutabledictionary alloc] init];
    //录音格式 无法使用
    [recordsettings setvalue :[nsnumber numberwithint:kaudioformatlinearpcm] forkey: avformatidkey];
    //采样率
    [recordsettings setvalue :[nsnumber numberwithfloat:11025.0] forkey: avsampleratekey];//44100.0
    //通道数
    [recordsettings setvalue :[nsnumber numberwithint:2] forkey: avnumberofchannelskey];
    //线性采样位数
    //[recordsettings setvalue :[nsnumber numberwithint:16] forkey: avlinearpcmbitdepthkey];
    //音频质量,采样质量
    [recordsettings setvalue:[nsnumber numberwithint:avaudioqualitymin] forkey:avencoderaudioqualitykey];
    
    return recordsettings;
}

- (void)startrecordnotice{

     if ([self.audiorecorder isrecording]) {
        [self.audiorecorder stop];
    }
   
    [self deleteoldrecordfile];  //如果不删掉，会在原文件基础上录制；虽然不会播放原来的声音，但是音频长度会是录制的最大长度。
    
    avaudiosession *audiosession=[avaudiosession sharedinstance];
    [audiosession setcategory:avaudiosessioncategoryplayandrecord error:nil];
    
    
    if (![self.audiorecorder isrecording]) {//0--停止、暂停，1-录制中
        
        [self.audiorecorder record];//首次使用应用时如果调用record方法会询问用户是否允许使用麦克风
        self.countnum = 0;
        nstimeinterval timeinterval =1 ; //0.1s
        self.timer1 = [nstimer scheduledtimerwithtimeinterval:timeinterval  target:self selector:@selector(changerecordtime)  userinfo:nil  repeats:yes];
        
        [self.timer1 fire];
    }
    [self staranimalwithtime:2.0];
}

- (void)stoprecordnotice
{
    nslog(@"----------结束录音----------");

    [self.audiorecorder stop];
    [self.timer1 invalidate];
   
}

三、使用avaudioplayer播放；

这段代码写的不好，暂不分享，欢迎大家分享给我

 

 

四、使用lame将caf音频转化为mp3;

导入lame框架，import进来头文件即可使用，如果导出后是噪音，需要检查录音的设置

#pragma mark - caf转mp3
- (void)audio_pcmtomp3
{
    
    @try {
        int read, write;
        
        file *pcm = fopen([self.cafpathstr cstringusingencoding:1], "rb");  //source 被转换的音频文件位置
        fseek(pcm, 4*1024, seek_cur);                                   //skip file header
        file *mp3 = fopen([self.mp3pathstr cstringusingencoding:1], "wb");  //output 输出生成的mp3文件位置
        
        const int pcm_size = 8192;
        const int mp3_size = 8192;
        short int pcm_buffer[pcm_size*2];
        unsigned char mp3_buffer[mp3_size];
        
        lame_t lame = lame_init();
        lame_set_in_samplerate(lame, 11025.0);
        lame_set_vbr(lame, vbr_default);
        lame_init_params(lame);
        
        do {
            read = fread(pcm_buffer, 2*sizeof(short int), pcm_size, pcm);
            if (read == 0)
                write = lame_encode_flush(lame, mp3_buffer, mp3_size);
            else
                write = lame_encode_buffer_interleaved(lame, pcm_buffer, read, mp3_buffer, mp3_size);
            
            fwrite(mp3_buffer, write, 1, mp3);
            
        } while (read != 0);
        
        lame_close(lame);
        fclose(mp3);
        fclose(pcm);
    }
    @catch (nsexception *exception) {
        nslog(@"%@",[exception description]);
    }
    @finally {
        nslog(@"mp3生成成功: %@",self.mp3pathstr);
    }
    
}

五、将mp3 转化为 base64编码；

 

#pragma mark - 文件转换
// 二进制文件转为base64的字符串
- (nsstring *)base64strwithmp3data:(nsdata *)data{
    if (!data) {
        nslog(@"mp3data 不能为空");
        return nil;
    }
    //    nsstring *str = [data base64encodedstringwithoptions:nsdatabase64encoding64characterlinelength];
    nsstring *str = [data base64encodedstringwithoptions:nsdatabase64encodingendlinewithlinefeed];
    return str;
}

// base64的字符串转化为二进制文件
- (nsdata *)mp3datawithbase64str:(nsstring *)str{
    if (str.length ==0) {
        nslog(@"mp3datawithbase64str:base64str 不能为空");
        return nil;
    }
    nsdata *data = [[nsdata alloc] initwithbase64encodedstring:str options:nsdatabase64decodingignoreunknowncharacters];
    nslog(@"mp3datawithbase64str:转换成功");
    return data;
}

 

六、查看录音文件大小；

//单个文件的大小,返回单位为k
- (long long) filesizeatpath:(nsstring*)filepath{
    
    nsfilemanager* manager = [nsfilemanager defaultmanager];
    
    if ([manager fileexistsatpath:filepath]){
        
        return [[manager attributesofitematpath:filepath error:nil] filesize];
        
    }
    
    return 0;
}

 

调用

  
//计算文件大小
    long long filesize = [self filesizeatpath:self.mp3pathstr]/1024.0;
    nsstring *filesizestr = [nsstring stringwithformat:@"%lld",filesize];

七、删除(语音)文件；

-(void)deleteoldrecordfileatpath:(nsstring *)pathstr{
    nsfilemanager* filemanager=[nsfilemanager defaultmanager];
    
    bool blhave=[[nsfilemanager defaultmanager] fileexistsatpath:pathstr];
    if (!blhave) {
        nslog(@"不存在");
        return ;
    }else {
        nslog(@"存在");
        bool bldele= [filemanager removeitematpath:self.cafpathstr error:nil];
        if (bldele) {
            nslog(@"删除成功");
        }else {
            nslog(@"删除失败");
        }
    }
}