iOS中 语音识别功能/语音转文字教程详解 韩俊强的博客


原文地址http://blog.csdn.net/qq_31810357/article/details/51111702

前言:最近研究了一下语音识别,从百度语音识别到讯飞语音识别;首先说一下个人针对两者的看法,讯飞毫无疑问比较专业,识别率也很高真对语音识别是比较精准的,但是很多开发者和我一样期望离线识别,而讯飞离线是收费的;请求次数来讲,两者都可以申请高配额,针对用户较多的几乎都一样。基于免费并且支持离线我选择了百度离线语音识别。比较简单,UI设计多一点,下面写一下教程:

1.首先:需要的库

iOS中 语音识别功能/语音转文字教程详解 韩俊强的博客

2.我是自定义的UI所以以功能实现为主(头文件)

// 头文件
#import "BDVRCustomRecognitonViewController.h"
#import "BDVRClientUIManager.h"
#import "WBVoiceRecordHUD.h"
#import "BDVRViewController.h"
#import "MyViewController.h"
#import "BDVRSConfig.h"

3.需要知道的功能:能用到的如下:

//-------------------类方法------------------------
// 创建语音识别客户对像,该对像是个单例
+ (BDVoiceRecognitionClient *)sharedInstance;

// 释放语音识别客户端对像
+ (void)releaseInstance;


//-------------------识别方法-----------------------
// 判断是否可以录音
- (BOOL)isCanRecorder;

// 开始语音识别,需要实现MVoiceRecognitionClientDelegate代理方法,并传入实现对像监听事件
// 返回值参考 TVoiceRecognitionStartWorkResult
- (int)startVoiceRecognition:(id<MVoiceRecognitionClientDelegate>)aDelegate;

// 说完了,用户主动完成录音时调用
- (void)speakFinish;

// 结束本次语音识别
- (void)stopVoiceRecognition;

/**
 * @brief 获取当前识别的采样率
 *
 * @return 采样率(16000/8000)
 */
- (int)getCurrentSampleRate;

/**
 * @brief 得到当前识别模式(deprecated)
 *
 * @return 当前识别模式
 */
- (int)getCurrentVoiceRecognitionMode __attribute__((deprecated));

/**
 * @brief 设置当前识别模式(deprecated),请使用-(void)setProperty:(TBDVoiceRecognitionProperty)property;
 *
 * @param 识别模式
 *
 * @return 是否设置成功
 */
- (void)setCurrentVoiceRecognitionMode:(int)aMode __attribute__((deprecated));

// 设置识别类型
- (void)setProperty:(TBDVoiceRecognitionProperty)property __attribute__((deprecated));

// 获取当前识别类型
- (int)getRecognitionProperty __attribute__((deprecated));

// 设置识别类型列表, 除EVoiceRecognitionPropertyInput和EVoiceRecognitionPropertySong外
// 可以识别类型复合
- (void)setPropertyList: (NSArray*)prop_list;

// cityID仅对EVoiceRecognitionPropertyMap识别类型有效
- (void)setCityID: (NSInteger)cityID;

// 获取当前识别类型列表
- (NSArray*)getRecognitionPropertyList;

//-------------------提示音-----------------------
// 播放提示音,默认为播放,录音开始,录音结束提示音
// BDVoiceRecognitionClientResources/Tone
// record_start.caf   录音开始声音文件
// record_end.caf     录音结束声音文件
// 声音资源需要加到项目工程里,用户可替换资源文件,文件名不可以变,建音提示音不宜过长,0。5秒左右。
// aTone 取值参考 TVoiceRecognitionPlayTones,如没有找到文件,则返回NO
- (BOOL)setPlayTone:(int)aTone isPlay:(BOOL)aIsPlay;

4.录音按钮相关动画(我自定义的,大家可以借鉴)


// 录音按钮相关
@property (nonatomic, weak, readonly) UIButton *holdDownButton;// 说话按钮
/**
 *  是否取消錄音
 */
@property (nonatomic, assign, readwrite) BOOL isCancelled;

/**
 *  是否正在錄音
 */
@property (nonatomic, assign, readwrite) BOOL isRecording;
/**
 *  当录音按钮被按下所触发的事件,这时候是开始录音
 */
- (void)holdDownButtonTouchDown;

/**
 *  当手指在录音按钮范围之外离开屏幕所触发的事件,这时候是取消录音
 */
- (void)holdDownButtonTouchUpOutside;

/**
 *  当手指在录音按钮范围之内离开屏幕所触发的事件,这时候是完成录音
 */
- (void)holdDownButtonTouchUpInside;

/**
 *  当手指滑动到录音按钮的范围之外所触发的事件
 */
- (void)holdDownDragOutside;

5.初始化系统UI

#pragma mark - layout subViews UI

/**
 *  根据正常显示和高亮状态创建一个按钮对象
 *
 *  @param image   正常显示图
 *  @param hlImage 高亮显示图
 *
 *  @return 返回按钮对象
 */
- (UIButton *)createButtonWithImage:(UIImage *)image HLImage:(UIImage *)hlImage ;
- (void)holdDownDragInside;
- (void)createInitView; // 创建初始化界面,播放提示音时会用到
- (void)createRecordView;  // 创建录音界面
- (void)createRecognitionView; // 创建识别界面
- (void)createErrorViewWithErrorType:(int)aStatus; // 在识别view中显示详细错误信息
- (void)createRunLogWithStatus:(int)aStatus; // 在状态view中显示详细状态信息

- (void)finishRecord:(id)sender; // 用户点击完成动作
- (void)cancel:(id)sender; // 用户点击取消动作

- (void)startVoiceLevelMeterTimer;
- (void)freeVoiceLevelMeterTimerTimer;

6.最重要的部分


// 录音完成
 [[BDVoiceRecognitionClient sharedInstance] speakFinish];

// 取消录音
[[BDVoiceRecognitionClient sharedInstance] stopVoiceRecognition];

7.两个代理方法

- (void)VoiceRecognitionClientWorkStatus:(int)aStatus obj:(id)aObj
{
    switch (aStatus)
    {
        case EVoiceRecognitionClientWorkStatusFlushData: // 连续上屏中间结果
        {
            NSString *text = [aObj objectAtIndex:0];
            
            if ([text length] > 0)
            {
//                [clientSampleViewController logOutToContinusManualResut:text];
                
                UILabel *clientWorkStatusFlushLabel = [[UILabel alloc]initWithFrame:CGRectMake(kScreenWidth/2 - 100,64,200,60)];
                clientWorkStatusFlushLabel.text = text;
                clientWorkStatusFlushLabel.textAlignment = NSTextAlignmentCenter;
                clientWorkStatusFlushLabel.font = [UIFont systemFontOfSize:18.0f];
                clientWorkStatusFlushLabel.numberOfLines = 0;
                clientWorkStatusFlushLabel.backgroundColor = [UIColor whiteColor];
                [self.view addSubview:clientWorkStatusFlushLabel];
                
            }

            break;
        }
        case EVoiceRecognitionClientWorkStatusFinish: // 识别正常完成并获得结果
        {
			[self createRunLogWithStatus:aStatus];
            
            if ([[BDVoiceRecognitionClient sharedInstance] getRecognitionProperty] != EVoiceRecognitionPropertyInput)
            {
                //  搜索模式下的结果为数组,示例为
                // ["公园", "公元"]
                NSMutableArray *audioResultData = (NSMutableArray *)aObj;
                NSMutableString *tmpString = [[NSMutableString alloc] initWithString:@""];
                
                for (int i=0; i < [audioResultData count]; i++)
                {
                    [tmpString appendFormat:@"%@\r\n",[audioResultData objectAtIndex:i]];
                }
                
                clientSampleViewController.resultView.text = nil;
                [clientSampleViewController logOutToManualResut:tmpString];
                
            }
            else
            {
                NSString *tmpString = [[BDVRSConfig sharedInstance] composeInputModeResult:aObj];
                [clientSampleViewController logOutToContinusManualResut:tmpString];
                
            }
           
            if (self.view.superview)
            {
                [self.view removeFromSuperview];
            }
            
            break;
        }
        case EVoiceRecognitionClientWorkStatusReceiveData:
        {
            // 此状态只有在输入模式下使用
            // 输入模式下的结果为带置信度的结果,示例如下:
            //  [
            //      [
            //         {
            //             "百度" = "0.6055192947387695";
            //         },
            //         {
            //             "摆渡" = "0.3625582158565521";
            //         },
            //      ]
            //      [
            //         {
            //             "一下" = "0.7665404081344604";
            //         }
            //      ],
            //   ]
//暂时关掉 -- 否则影响跳转结果
//            NSString *tmpString = [[BDVRSConfig sharedInstance] composeInputModeResult:aObj];
//            [clientSampleViewController logOutToContinusManualResut:tmpString];
            
            break;
        }
        case EVoiceRecognitionClientWorkStatusEnd: // 用户说话完成,等待服务器返回识别结果
        {
			[self createRunLogWithStatus:aStatus];
            if ([BDVRSConfig sharedInstance].voiceLevelMeter)
            {
                [self freeVoiceLevelMeterTimerTimer];
            }
			
            [self createRecognitionView];
            
            break;
        }
        case EVoiceRecognitionClientWorkStatusCancel:
        {            
            if ([BDVRSConfig sharedInstance].voiceLevelMeter) 
            {
                [self freeVoiceLevelMeterTimerTimer];
            }
            
			[self createRunLogWithStatus:aStatus];  
            
            if (self.view.superview) 
            {
                [self.view removeFromSuperview];
            }
            break;
        }
        case EVoiceRecognitionClientWorkStatusStartWorkIng: // 识别库开始识别工作,用户可以说话
        {
            if ([BDVRSConfig sharedInstance].playStartMusicSwitch) // 如果播放了提示音,此时再给用户提示可以说话
            {
                [self createRecordView];
            }
            
            if ([BDVRSConfig sharedInstance].voiceLevelMeter)  // 开启语音音量监听
            {
                [self startVoiceLevelMeterTimer];
            }
            
			[self createRunLogWithStatus:aStatus]; 

            break;
        }
		case EVoiceRecognitionClientWorkStatusNone:
		case EVoiceRecognitionClientWorkPlayStartTone:
		case EVoiceRecognitionClientWorkPlayStartToneFinish:
		case EVoiceRecognitionClientWorkStatusStart:
		case EVoiceRecognitionClientWorkPlayEndToneFinish:
		case EVoiceRecognitionClientWorkPlayEndTone:
		{
			[self createRunLogWithStatus:aStatus];
			break;
		}
        case EVoiceRecognitionClientWorkStatusNewRecordData:
        {
            break;
        }
        default:
        {
			[self createRunLogWithStatus:aStatus];
            if ([BDVRSConfig sharedInstance].voiceLevelMeter) 
            {
                [self freeVoiceLevelMeterTimerTimer];
            }
            if (self.view.superview) 
            {
                [self.view removeFromSuperview];
            }
 
            break;
        }
    }
}

- (void)VoiceRecognitionClientNetWorkStatus:(int) aStatus
{
    switch (aStatus) 
    {
        case EVoiceRecognitionClientNetWorkStatusStart:
        {	
			[self createRunLogWithStatus:aStatus];
            [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
            break;   
        }
        case EVoiceRecognitionClientNetWorkStatusEnd:
        {
			[self createRunLogWithStatus:aStatus];
			[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
            break;   
        }          
    }
}

8.录音按钮的一些操作


#pragma mark ------ 关于按钮操作的一些事情-------
- (void)holdDownButtonTouchDown {
    // 开始动画
    _disPlayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(delayAnimation)];
    _disPlayLink.frameInterval = 40;
    [_disPlayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
    
    self.isCancelled = NO;
    self.isRecording = NO;
    
 // 开始语音识别功能,之前必须实现MVoiceRecognitionClientDelegate协议中的VoiceRecognitionClientWorkStatus:obj方法
    int startStatus = -1;
    startStatus = [[BDVoiceRecognitionClient sharedInstance] startVoiceRecognition:self];
    if (startStatus != EVoiceRecognitionStartWorking) // 创建失败则报告错误
    {
        NSString *statusString = [NSString stringWithFormat:@"%d",startStatus];
        [self performSelector:@selector(firstStartError:) withObject:statusString afterDelay:0.3];  // 延迟0.3秒,以便能在出错时正常删除view
        return;
    }
    // "按住说话-松开搜索"提示
    [voiceImageStr removeFromSuperview];
    voiceImageStr = [[UIImageView alloc]initWithFrame:CGRectMake(kScreenWidth/2 - 40, kScreenHeight - 153, 80, 33)];
    voiceImageStr.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"searchVoice"]];
    [self.view addSubview:voiceImageStr];
   
}

- (void)holdDownButtonTouchUpOutside {
    // 结束动画
    [self.view.layer removeAllAnimations];
    [_disPlayLink invalidate];
    _disPlayLink = nil;
    
    // 取消录音
    [[BDVoiceRecognitionClient sharedInstance] stopVoiceRecognition];
    
    if (self.view.superview)
    {
        [self.view removeFromSuperview];
    }
}

- (void)holdDownButtonTouchUpInside {
    // 结束动画
    [self.view.layer removeAllAnimations];
    [_disPlayLink invalidate];
    _disPlayLink = nil;
    
    [[BDVoiceRecognitionClient sharedInstance] speakFinish];
}

- (void)holdDownDragOutside {
    
    //如果已經開始錄音了, 才需要做拖曳出去的動作, 否則只要切換 isCancelled, 不讓錄音開始.
    if (self.isRecording) {
//        if ([self.delegate respondsToSelector:@selector(didDragOutsideAction)]) {
//            [self.delegate didDragOutsideAction];
//        }
    } else {
        self.isCancelled = YES;
    }
}


#pragma mark - layout subViews UI

- (UIButton *)createButtonWithImage:(UIImage *)image HLImage:(UIImage *)hlImage {
    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(kScreenWidth/2 -36, kScreenHeight - 120, 72, 72)];
    
    if (image)
        [button setBackgroundImage:image forState:UIControlStateNormal];
    if (hlImage)
        [button setBackgroundImage:hlImage forState:UIControlStateHighlighted];
    
    return button;
}

#pragma mark ----------- 动画部分 -----------
- (void)startAnimation
{
    CALayer *layer = [[CALayer alloc] init];
    layer.cornerRadius = [UIScreen mainScreen].bounds.size.width/2;
    layer.frame = CGRectMake(0, 0, layer.cornerRadius * 2, layer.cornerRadius * 2);
    layer.position = CGPointMake([UIScreen mainScreen].bounds.size.width/2,[UIScreen mainScreen].bounds.size.height - 84);
    //    self.view.layer.position;
    UIColor *color = [UIColor colorWithRed:arc4random()%10*0.1 green:arc4random()%10*0.1 blue:arc4random()%10*0.1 alpha:1];
    layer.backgroundColor = color.CGColor;
    [self.view.layer addSublayer:layer];
    
    CAMediaTimingFunction *defaultCurve = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault];
    
    _animaTionGroup = [CAAnimationGroup animation];
    _animaTionGroup.delegate = self;
    _animaTionGroup.duration = 2;
    _animaTionGroup.removedOnCompletion = YES;
    _animaTionGroup.timingFunction = defaultCurve;
    
    CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale.xy"];
    scaleAnimation.fromValue = @0.0;
    scaleAnimation.toValue = @1.0;
    scaleAnimation.duration = 2;
    
    CAKeyframeAnimation *opencityAnimation = [CAKeyframeAnimation animationWithKeyPath:@"opacity"];
    opencityAnimation.duration = 2;
    opencityAnimation.values = @[@0.8,@0.4,@0];
    opencityAnimation.keyTimes = @[@0,@0.5,@1];
    opencityAnimation.removedOnCompletion = YES;
    
    NSArray *animations = @[scaleAnimation,opencityAnimation];
    _animaTionGroup.animations = animations;
    [layer addAnimation:_animaTionGroup forKey:nil];
    
    [self performSelector:@selector(removeLayer:) withObject:layer afterDelay:1.5];
}

- (void)removeLayer:(CALayer *)layer
{
    [layer removeFromSuperlayer];
}


- (void)delayAnimation
{
    [self startAnimation];
}

完成以上操作,就大功告成了!

温馨提示:

1.由于是语音识别,需要用到麦克风相关权限,模拟器会爆12个错误,使用真机可以解决;

2.涉及到授权文件相关并不复杂,工程Bundle Identifier只需要设置百度的离线授权一致即可,如下图:

iOS中 语音识别功能/语音转文字教程详解 韩俊强的博客

iOS中 语音识别功能/语音转文字教程详解 韩俊强的博客


最终效果如下:

iOS中 语音识别功能/语音转文字教程详解 韩俊强的博客

iOS中 语音识别功能/语音转文字教程详解 韩俊强的博客

iOS中 语音识别功能/语音转文字教程详解 韩俊强的博客

iOS中 语音识别功能/语音转文字教程详解 韩俊强的博客


有不懂或不明白的地方可以微博联系我:


iOS中 语音识别功能/语音转文字教程详解 韩俊强的博客

iOS开发者交流群:446310206





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