背景色を変えるのにスライダーを使った＋その下にカメラビューを表示＋カメラの切り替え（試作）

viewController.h

//
//  ViewController.h
//  121204
//
//  Created by changhwi on 12/12/04.
//  Copyright (c) 2012年 changhwi. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>

float valueR;
float valueG;
float valueB;
float valueA;

AVCaptureDevice *frontCamera;
AVCaptureDevice *backCamera;
NSArray *devices;

@interface ViewController : UIViewController <AVCaptureVideoDataOutputSampleBufferDelegate, UITextFieldDelegate>
{
    AVCaptureSession *session;
    UIView *myView;
}
@property (strong, nonatomic) IBOutlet UIView *backgroundView;
@property (strong, nonatomic) IBOutlet UIImageView *cameraView;
@property (strong, nonatomic) IBOutlet UITextField *myTextField;
- (IBAction)cameraChenge:(id)sender;


- (void)captureOutput:(AVCaptureOutput*)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
       fromConnection:(AVCaptureConnection*)connection;

@end

viewController.m

//
//  ViewController.m
//  121204
//
//  Created by changhwi on 12/12/04.
//  Copyright (c) 2012年 changhwi. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    
    [self drawSlider];
    [self cameraSelect];
    [self cameraSetting];
    [self viewUpdate];
    
    self.myTextField.delegate = self;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (void)viewUpdate{
    self.backgroundView.backgroundColor = [UIColor colorWithRed:valueR green:valueG blue:valueB alpha:valueA];
}

#pragma mark - textField
-(BOOL)textFieldShouldReturn:(UITextField*)sdassavsdav{
    [_myTextField resignFirstResponder];
    return YES;
}

#pragma mark - slider

- (void)drawSlider{
    //viewのサイズ
    int height = self.view.frame.size.height;
    int width = self.view.frame.size.width;
    //viewの中央座標
    int centerHeight = height / 2;
    //各sliderのサイズ
    int sliderHeight = 0;
    int sliderWidth = height / 5 * 4;
    //slider間の距離
    int sliderFix = sliderWidth / 2;
    //sliderを中央に合わせるための値
    int sliderMargin = width / 5;
    //RGBAの初期値
    float firstValue = 0.5;
    //初期値の代入
    valueR = valueG = valueB = valueA = firstValue;
    //270度回転させる関数
    CGAffineTransform trans = CGAffineTransformMakeRotation(M_PI * 270 / 180.0f);
    
    //sliderR
    UISlider *sliderR = [[UISlider alloc]
                         initWithFrame:CGRectMake(sliderMargin - sliderFix, centerHeight, sliderWidth, sliderHeight)];
    sliderR.value = firstValue;
    sliderR.maximumValue = 1.0;
    sliderR.minimumValue = 0.0;
    
    //    sliderR.continuous = YES;
    sliderR.transform = trans;
    
    [sliderR addTarget:self
                action:@selector(sliderRChengeValue:)
      forControlEvents:UIControlEventAllTouchEvents];
    
    [self.view addSubview:sliderR];
    
    
    //sliderG
    UISlider *sliderG = [[UISlider alloc]
                         initWithFrame:CGRectMake(sliderMargin * 2 - sliderFix, centerHeight, sliderWidth, sliderHeight)];
    sliderG.value = firstValue;
    sliderG.maximumValue = 1.;
    sliderG.minimumValue = 0.;
    
    //    sliderG.continuous = YES;
    
    sliderG.transform = trans;
    
    [sliderG addTarget:self
                action:@selector(sliderGChengeValue:)
      forControlEvents:UIControlEventAllTouchEvents];
    
    [self.view addSubview:sliderG];
    
    
    //sliderB
    UISlider *sliderB = [[UISlider alloc]
                         initWithFrame:CGRectMake(sliderMargin * 3 - sliderFix, centerHeight, sliderWidth, sliderHeight)];
    
    sliderB.value = firstValue;
    sliderB.maximumValue = 1.;
    sliderB.minimumValue = 0.;
    //    sliderB.continuous = YES;
    
    sliderB.transform = trans;
    
    [sliderB addTarget:self
                action:@selector(sliderBChengeValue:)
      forControlEvents:UIControlEventAllTouchEvents];
    
    [self.view addSubview:sliderB];
    
    //sliderA
    UISlider *sliderA = [[UISlider alloc]
                         initWithFrame:CGRectMake(sliderMargin * 4 - sliderFix, centerHeight, sliderWidth, sliderHeight)];
    
    sliderA.value = firstValue;
    sliderA.maximumValue = 1.;
    sliderA.minimumValue = 0.;
    
    //    sliderA.continuous = YES;
    
    sliderA.transform = trans;
    
    [sliderA addTarget:self
                action:@selector(sliderAChengeValue:)
      forControlEvents:UIControlEventAllTouchEvents];
    
    [self.view addSubview:sliderA];
    
}

- (void)sliderRChengeValue:(id)sender{
    UISlider *slValueR = sender;
    valueR = slValueR.value;
    [self viewUpdate];
}

- (void)sliderGChengeValue:(id)sender{
    UISlider *slValueG = sender;
    valueG = slValueG.value;
    [self viewUpdate];
}

- (void)sliderBChengeValue:(id)sender{
    UISlider *slValueB = sender;
    valueB = slValueB.value;
    [self viewUpdate];
}

- (void)sliderAChengeValue:(id)sender{
    UISlider *slValueA = sender;
    valueA = slValueA.value;
    [self viewUpdate];
}

#pragma mark - camera

- (void)cameraSelect{
    /**
     AVCaptureSession（カメラとのやりとりをする役担当）をalloc & init
     ---------------------------------------------
     */
    session = [[AVCaptureSession alloc] init];
    
    
    /**
     input deviceを選んで、sessionに登録
     - できれば front facing camを使いたい
     - front camがついてない場合は back cam
     - frontもbackもついていない場合は ....
     ---------------------------------------------
     */
    
    // ビデオキャプチャデバイスの取得（ビデオのデータを持ってきてくれるデバイス）
    // このアプリを実行してるiOSデバイスについてるカメラ一覧
    NSArray *devices = [AVCaptureDevice devices];
    for (int i=0; i<[devices count]; i++)
    {
        AVCaptureDevice *device = [devices objectAtIndex:i];
        NSLog(@"Device name: %@", [device localizedName]);
        
        if ([device hasMediaType:AVMediaTypeVideo])
        {
            //            if ([device position] == AVCaptureDevicePositionBack)
            //            {
            //                NSLog(@"Device position : back");
            //                backCamera = device;
            //            }
            if([device position] == AVCaptureDevicePositionFront)
            {
                NSLog(@"Device position : front");
                frontCamera = device;
            }
            else
            {
                NSLog(@"不明な positionのカメラ");
            }
        }
    }
    
    // カメラがついていないデバイス向け
    if ([devices count] == 0)
    {
        // 本当はもうちょっと詳しく分別チェックできるけど、videoに対応したfront or back cameraがほしいので、
        // count == 0 の場合は、チャンさんがほしいカメラがなかったものとする
        NSLog(@"カメラがついてない ....");
    }
    
    // for ~ in を使うと......
    // ----------
    //    for (AVCaptureDevice *device in devices) {
    //
    //        NSLog(@"Device name: %@", [device localizedName]);
    //
    //        if ([device hasMediaType:AVMediaTypeVideo]) {
    //
    //            if ([device position] == AVCaptureDevicePositionBack) {
    //                NSLog(@"Device position : back");
    //                backCamera = device;
    //            }
    //            else {
    //                NSLog(@"Device position : front");
    //                frontCamera = device;
    //            }
    //        }
    //    }
    // ----------
    
    
    NSError *error = nil;
    AVCaptureDeviceInput *frontFacingCameraDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:frontCamera error:&error];
    if (error == nil)
    {
        if ([session canAddInput:frontFacingCameraDeviceInput])
            [session addInput:frontFacingCameraDeviceInput];
        else {
            NSLog(@"Couldn't add front facing video input");
        }
    }
}

- (void)cameraSetting{
    /**
     output deviceを選んで、sessionに登録
     ---------------------------------------------
     */
    
    // output.......
    // -----------------------
    AVCaptureVideoDataOutput *dataOutput = [[AVCaptureVideoDataOutput alloc] init];
    
    // ビデオデータ出力の作成
    //設定を辞書に書き込む
    NSMutableDictionary *settings = [NSMutableDictionary dictionary];
    [settings setObject:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA]
                 forKey:(id)kCVPixelBufferPixelFormatTypeKey];
    //設定をアウトプットに読み込む
    dataOutput.videoSettings = settings;
    //メインキュー（デバイスから情報がくるたび＝毎フレーム）の後に毎回setSampleBufferDelegateをする
    [dataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];
    
    
    // sessionに in/outわたす.......
    // -----------------------
    // セッションの作成
    //    [session addInput:deviceInput];
    [session addOutput:dataOutput];
    
    // セッションの開始
    [session startRunning];

}

- (IBAction)cameraChenge:(id)sender {
    /**
     AVCaptureSession（カメラとのやりとりをする役担当）をalloc & init
     ---------------------------------------------
     */
    session = [[AVCaptureSession alloc] init];
    
    
    /**
     input deviceを選んで、sessionに登録
     - できれば front facing camを使いたい
     - front camがついてない場合は back cam
     - frontもbackもついていない場合は ....
     ---------------------------------------------
     */
    
    // ビデオキャプチャデバイスの取得（ビデオのデータを持ってきてくれるデバイス）
    // このアプリを実行してるiOSデバイスについてるカメラ一覧
    NSArray *devices = [AVCaptureDevice devices];
    for (int i=0; i<[devices count]; i++)
    {
        AVCaptureDevice *device = [devices objectAtIndex:i];
        NSLog(@"Device name: %@", [device localizedName]);
        
//        if ([device hasMediaType:AVMediaTypeVideo])
//        {
//                        if ([device position] == AVCaptureDevicePositionBack)
//                        {
//                            NSLog(@"Device position : back");
//                            backCamera = device;
//                        }
//            if([device position] == AVCaptureDevicePositionFront)
//            {
//                NSLog(@"Device position : front");
//                frontCamera = device;
//            }
//            else
//            {
//                NSLog(@"不明な positionのカメラ");
//            }
//        }
//    }
//    
//    // カメラがついていないデバイス向け
//    if ([devices count] == 0)
//    {
//        // 本当はもうちょっと詳しく分別チェックできるけど、videoに対応したfront or back cameraがほしいので、
//        // count == 0 の場合は、チャンさんがほしいカメラがなかったものとする
//        NSLog(@"カメラがついてない ....");
//    }
    
    // for ~ in を使うと......
    // ----------
        for (AVCaptureDevice *device in devices) {
    
            NSLog(@"Device name: %@", [device localizedName]);
    
            if ([device hasMediaType:AVMediaTypeVideo]) {
    
                if ([device position] == AVCaptureDevicePositionBack) {
                    NSLog(@"Device position : back");
                    backCamera = device;
                }
                else {
                    NSLog(@"Device position : front");
                    frontCamera = device;
                }
            }
        }
    // ----------
    
    
    NSError *error = nil;
    AVCaptureDeviceInput *frontFacingCameraDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:backCamera error:&error];
    if (error == nil)
    {
        if ([session canAddInput:frontFacingCameraDeviceInput])
            [session addInput:frontFacingCameraDeviceInput];
        else {
            NSLog(@"Couldn't add front facing video input");
        }
    }
    }
    
    [self cameraSetting];
}

- (void)captureOutput:(AVCaptureOutput*)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
       fromConnection:(AVCaptureConnection*)connection
{
    // イメージバッファの取得
    CVImageBufferRef buffer;
    buffer = CMSampleBufferGetImageBuffer(sampleBuffer);
    
    // イメージバッファのロック
    CVPixelBufferLockBaseAddress(buffer, 0);
    
    // イメージバッファ情報の取得
    uint8_t*    base;
    size_t      width, height, bytesPerRow;
    base = CVPixelBufferGetBaseAddress(buffer);
    width = CVPixelBufferGetWidth(buffer);
    height = CVPixelBufferGetHeight(buffer);
    bytesPerRow = CVPixelBufferGetBytesPerRow(buffer);
    
    // ビットマップコンテキストの作成
    //色
    CGColorSpaceRef colorSpace;
    //サイズなど
    CGContextRef    cgContext;
    colorSpace = CGColorSpaceCreateDeviceRGB();
    cgContext = CGBitmapContextCreate(
                                      base, width, height, 8, bytesPerRow, colorSpace,
                                      kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
    CGColorSpaceRelease(colorSpace);
    
    // 画像の作成
    CGImageRef  cgImage;
    UIImage*    image;
    cgImage = CGBitmapContextCreateImage(cgContext);
    image = [UIImage imageWithCGImage:cgImage scale:1.0f
                          orientation:UIImageOrientationRight];
    CGImageRelease(cgImage);
    CGContextRelease(cgContext);
    
    // イメージバッファのアンロック
    CVPixelBufferUnlockBaseAddress(buffer, 0);
    
    // 画像の表示
    _cameraView.image = image;
}


@end