录像、录音和拍照

最新推荐文章于 2024-02-26 10:57:06 发布

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#录音拍照和录像

现在我们使用的手机，无论是苹果还是安卓，都能够录音、拍照和录像，而且感觉这是在正常不过的了，不仅如此，现在的手机还能够修音，修图在这里就不介绍了，这里主要介绍如何实现录音、拍照和录像的功能。

一、录音

录音的介绍：使用的框架和音乐播放器一样使用的AVFoundation

录音使用到的类

（1）AVAudioRecord（输入）

（2）相关的设置属性

<1>AVNumberOfChannelsKey：通道数

<2>AVSampleRateKey：采样率 44100

<3>AVLinearPCMBitDepthKey：比特率设置成16 32

<4>AVEncoderAudioQualityKey：质量

<5>AVEncoderBitRateKey：比特采样率 128000

录音的步骤

1、初始化了录音对象

2、开始录音

3、停止录音

具体代码

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>

@interface ViewController ()<AVAudioRecorderDelegate>

{

AVAudioRecorder *audionRecorder;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

button.frame = CGRectMake(100, 100, 100, 100);

[button setTitle:@"TICK" forState:UIControlStateNormal];

button.backgroundColor = [UIColor brownColor];

[button addTarget:self action:@selector(startAudioRecorder:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:button];

}

- (void)startAudioRecorder:(UIButton *)sender{

sender.selected = !sender.selected;

if (sender.selected != YES) {

[audionRecorder stop];//停止录音

}

// URL是本地的URL，audioRecorder

NSString *name = [NSString stringWithFormat:@"%d.aiff",(int)[NSDatedate].timeIntervalSince1970];

NSString *path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:name];

// 1、初始化录音机

NSError *error;

audionRecorder = [[AVAudioRecorder alloc] initWithURL:[NSURL URLWithString:path] settings:@{AVNumberOfChannelsKey:@2,AVSampleRateKey:@44100,AVLinearPCMBitDepthKey:@32,AVEncoderAudioQualityKey:@(AVAudioQualityMax),AVEncoderBitRateKey:@128000} error:&error];

AVNumberOfChannelsKey：通道数，通常为双声道值2

AVSampleRateKey：采样率 HZ 通常设置为44100 44.1KHZ

AVLinearPCMBitDepthKey:比特率，通常为8 16 24 32

AVEncoderAudioQualityKey：声音质量，参数是一个枚举

AVAudioQualityMin = 0,最小的质量

AVAudioQualityLow = 0x20,比较低的质量

AVAudioQualityMedium = 0x40,中间的质量

AVAudioQualityHigh = 0x60,高的质量

AVAudioQualityMax = 0x7F最好的质量

AVEncoderBitRateKey：音频编码的比特率单位BPS（传输速率）128000bps

[audionRecorder prepareToRecord];//欲录音

[audionRecorder record];//开始录音

audionRecorder.delegate = self;

NSLog(@"%@",path);

}

//录音结束的时候调用

- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{

// NSLog(@"录音结束");

NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject];

// 文件操作的类

NSFileManager *fileManager = [NSFileManager defaultManager];

// 获得当前文件的所有子文件subpathsAtPath：

NSArray *pathList = [fileManager subpathsAtPath:path];

// NSLog(@"%@",pathList);

// NSString *path1 = pathList[2];

// NSLog(@"%@",path1.pathExtension);

// 需要只获得录音文件

NSMutableArray *audioPathList = [NSMutableArray array];

// 遍历所有这个文件夹下面的子文件

for (NSString *audioPath in pathList) {

// 通过文件的扩展名（尾缀）来区分是不是录音文件

if ([audioPath.pathExtension isEqualToString:@"aiff"]) {

// 把筛选出来的文件放到数组，得到所有的音频wenjian

[audioPathList addObject:audioPath];

}

NSLog(@"%@",audioPathList);

}

录像和拍照的使用很相似，在这里就将它们两个一块讲了

录像、拍照

录像和拍照使用的框架是UIKit框架，使用的类是：UIImagePickerController

介绍一些属性和方法

区分选择摄像头还是相册：sourceType
 UIImagePickerControllerSourceTypePhotoLibrary,

 保存的相册
 UIImagePickerControllerSourceTypeCamera,摄像头
 UIImagePickerControllerSourceTypeSavedPhotosAlbum相册

 区分录像和拍照cameraCaptureMode
  拍照：UIImagePickerControllerCameraCaptureModePhoto
  录像：UIImagePickerControllerCameraCaptureModeVideo

 设置视频清晰度
 UIImagePickerControllerQualityTypeHigh高清
 UIImagePickerControllerQualityTypeMedium普通
 UIImagePickerControllerQualityTypeLow
 UIImagePickerControllerQualityType 640x480
 UIImagePickerControllerQualityTypeIFrame 1280x720
 UIImagePickerControllerQualityTypeIFrame 960x540

 设置视频最大的持续时间
 videoMaximumDuration 默认最大十分钟

 区分前后摄像头：cameraDevice
 前置：UIImagePickerControllerCameraDeviceFront
 后置：UIImagePickerControllerCameraDeviceRear

 是否显示控制控件：showsCameraControls

 默认YES显示控制控件

 设置拍照：takePicture

 录像：startVideoCapture
 停止：stopVideoCapture

 闪光模式：cameraFlashMode，默认自动
 UIImagePickerControllerCameraFlashModeOff  = -1,关闭
 UIImagePickerControllerCameraFlashModeAuto = 0,自动
 UIImagePickerControllerCameraFlashModeOn   = 1

 开启

 设置调用摄像头视图页面 覆盖视图
 cameraOverlayView

 设置拍照页面的形态 camereViewTransform

 代理：需要导入两个代理
 @property(nullable,nonatomic,weak)      id <UINavigationControllerDelegate, UIImagePickerControllerDelegate> delegate;

 代理方法：不区分录像和拍照

采集完成之后调用 不区分拍照和录像
 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info;

 采集取消的时候调用
 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;

具体代码

#import "ViewController.h"

#import <AVKit/AVKit.h>

#import <AVFoundation/AVFoundation.h>

#import <MobileCoreServices/MobileCoreServices.h>

#define SCREEN_BOUNDS [UIScreen mainScreen].bounds//屏幕尺寸

#define SCREEN_WIDTH CGRectGetWidth([UIScreen mainScreen].bounds)//屏幕宽

#define SCREEN_HEIGHT CGRectGetHeight([UIScreen mainScreen].bounds)//屏幕高

@interface ViewController ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate>
{

    UILabel *lable;//显示拍照或者录像的控件
    BOOL isMovie;//判断摄像的依据

    UIImageView *imageView;//显示拍照录像结果的视图
}

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(100, 100, 100, 100);

    [button setTitle:@"Camera" forState:UIControlStateNormal];
    button.backgroundColor = [UIColor brownColor];

    [button addTarget:self action:@selector(doit) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];

    UISwitch *medioSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(SCREEN_WIDTH-100, 50, 50, 30)];

    [medioSwitch addTarget:self action:@selector(changeMedio:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:medioSwitch];

    lable = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMinX(medioSwitch.frame), CGRectGetMinY(medioSwitch.frame)-30, 50, 50)];

    lable.textAlignment = NSTextAlignmentCenter;
    lable.textColor =
 [UIColor purpleColor];
    lable.text = @"拍照";
    [self.view addSubview:lable];

    imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 150, 200, 300)];
    [self.view addSubview:imageView];
}

- (void)changeMedio:(UISwitch *)sender{

    lable.text = sender.isOn != YES ? @"拍照":@"录像";

    isMovie = sender.isOn;

}

- (void)doit{

    //    创建录像、拍照对象

    UIImagePickerController *pickImageController = [[UIImagePickerController alloc] init];
    if (isMovie == YES)
 {

 //    选择摄像头设备

//     默认选择相册

    pickImageController.sourceType = UIImagePickerControllerSourceTypeCamera;

//    设置选择录像

//    默认拍照 选择cameraCaptureMode录像，一定要选择媒体的类型 不然会崩溃

//    选择媒体的类型

//    拍照的时候不选择媒体类型，不会崩溃，因为默认设置是kUTTypeImage

//    kUTTypeImage包含在MobileCoreServices框架中

//    MobileCoreServices需要的内容不是OC中字符串的类型，需要强转

//    mediaTypes录制视频，类型要选择movie，因为movie里面包含了audio和video
    pickImageController.mediaTypes = @[(NSString *)kUTTypeMovie];

    pickImageController.cameraCaptureMode =  UIImagePickerControllerCameraCaptureModeVideo;

     }

//    delegate里面包含两个协议

//    UINavigationBarDelegate

//    UIImagePickerControllerDelegate
    pickImageController.delegate = self;

    [self presentViewController:pickImageController animated:YES completion:nil];

}

- (void)imagePickerController:(UIImagePickerController *)picker
 didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{

    NSLog(@"完成");

    NSLog(@">>>>%@",info);

    if ([info [UIImagePickerControllerMediaType] isEqualToString:(NSString *)kUTTypeMovie])
 {
        NSLog(@"录像。。。。。");

        NSLog(@"******%@",[info[UIImagePickerControllerMediaURL] path]);

//        将URL转换成path
        NSString *path = (NSString *)[info[UIImagePickerControllerMediaURL] path];

//        UIImagePickerControllerMediaURL

//        保存视频到URL
        UISaveVideoAtPathToSavedPhotosAlbum(path, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);
    }

    if ([info [UIImagePickerControllerMediaType ] isEqualToString:(NSString *)kUTTypeImage])
 {
        NSLog(@"拍照了。。。。。");

//        UIImagePickerControllerOriginalImage

//        NSLog(@"%@",info [UIImagePickerControllerOriginalImage]);

        UIImage *finishImage = info[UIImagePickerControllerOriginalImage];

        imageView.image = nil;
        imageView.image =
 finishImage;

//        .jpeg的图片转换成二进制
     NSData *imageData = UIImageJPEGRepresentation(finishImage, 0.1);

//        .png的图片转换成二进制
    NSData *imageData1 = UIImagePNGRepresentation(finishImage);

//        通过这个方法将图片保存到相册
        UIImageWriteToSavedPhotosAlbum(finishImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
    }

 [self dismissViewControllerAnimated:YES completion:nil];
}

//视频保存到相册之后调用
- (void)video:(NSString *)videoPath
 didFinishSavingWithError:(NSError *)error contextInfo:(void*)contextInfo{

    AVPlayer *player = [AVPlayer playerWithURL:[NSURL fileURLWithPath:videoPath]];

    AVPlayerViewController *palyerVC = [[AVPlayerViewController alloc] init];

//    [self.view addSubview:palyerVC.view];
    palyerVC.player = player;

    [self presentViewController:palyerVC animated:YES completion:nil];

    [palyerVC.player play];
}

//图片保存到相册之后调用
- (void)image:(UIImage *)image
 didFinishSavingWithError:(NSError *)error contextInfo:(void*)contextInfo{

    NSLog(@"保存图片成功");

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    NSLog(@"取消");

    [self dismissViewControllerAnimated:YES completion:nil];
}
- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.
}

@end