Android的 - 问题蒙山转换preVIEW架位图 [英] Android - Problem whith converting preview frame to bitmap

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问题描述

我知道这个问题是在黑板上很多次,但我无法得到它的工作无论如何... 我想保存视图帧从preVIEW为JPEG文件。它看起来更多或更少(code是simplified-无需额外的逻辑,异常等),这样的...

I know the subject was on the board many times, but i can not get it work anyhow... I want to save view frames from preview to jpeg files. It looks more or less(code is simplified- without additional logic, exception etc) like this...

public void onPreviewFrame(byte[] data, Camera camera) {
  int width = camera.getParameters().getPreviewSize().width;
  int height = camera.getParameters().getPreviewSize().height;


  final int[] rgb = decodeYUV420SP(data, width, height);

  Bitmap bmp = Bitmap.createBitmap(rgb, width, height,Bitmap.Config.ARGB_8888);

  String filename="/sdcard/file" + (index++)+ ".jpg"; 
  FileOutputStream out;
  out = new FileOutputStream(filename);
  bmp.compress(Bitmap.CompressFormat.JPEG, 90, out);
  out.flush();
  out.close();
  out=null;

 }

下面是方法我试过颜色转换(从这个板,我相信)

Here is the one of the methods i tried to convert colors(from this board i believe)

public int[] decodeYUV420SP( byte[] yuv420sp, int width, int height) {   

    final int frameSize = width * height;   

    int rgb[]=new int[width*height];   
    for (int j = 0, yp = 0; j < height; j++) {   
        int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;   
        for (int i = 0; i < width; i++, yp++) {   
            int y = (0xff & ((int) yuv420sp[yp])) - 16;   
            if (y < 0) y = 0;   
            if ((i & 1) == 0) {   
                v = (0xff & yuv420sp[uvp++]) - 128;   
                u = (0xff & yuv420sp[uvp++]) - 128;   
            }   

            int y1192 = 1192 * y;   
            int r = (y1192 + 1634 * v);   
            int g = (y1192 - 833 * v - 400 * u);   
            int b = (y1192 + 2066 * u);   

            if (r < 0) r = 0; else if (r > 262143) r = 262143;   
            if (g < 0) g = 0; else if (g > 262143) g = 262143;   
            if (b < 0) b = 0; else if (b > 262143) b = 262143;   

            rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) &    
    0xff00) | ((b >> 10) & 0xff);   


        }   
    }   
    return rgb;   
    } 

问题是,照片​​总是看起来像三个奇怪的绿色图片...... 我AMA新的用户,所以我不能将它张贴:(

The problem is that the picture always looks like three 'strange green pictures'... I ama new user so i can't post it:(

我不知道它是否有事可做的大小或什么,但我坚持... 你可以用它支持我?

I dont know if it has something to do with the size or what but i am stuck... Can you support me with it?

推荐答案

因为我发现从previewSize阅读的宽度和高度都错了.... 换句话说,转换出了问题,因为它是基于错误的价值观。 使用设置preVIEW设置的新方法后(例如从由谷歌deleivered)一切工作正常。

as I found out the width and height read from PreviewSize were wrong.... In other words the conversion went wrong because it was based on false values. After use a new way of setting the preview settings(from example deleivered by google) everything works fine.

编辑:

对不起,上面长的延迟快速的解答。

Sorry for the quick answer above and long delay.

这是前一段时间,我不能再挖了code,但我认为我使用:

It was while ago and I can not dig the code now, but i think that I used:

<一个href="http://developer.android.com/reference/android/hardware/Camera.Parameters.html#getSupported$p$pviewSizes%28%29" rel="nofollow">http://developer.android.com/reference/android/hardware/Camera.Parameters.html#getSupported$p$pviewSizes()

和采取了从列表中的第一个元素,以

and took the first element from the list and set the values with

<一个href="http://developer.android.com/reference/android/hardware/Camera.Parameters.html#set$p$pviewSize%28int,%20int%29" rel="nofollow">http://developer.android.com/reference/android/hardware/Camera.Parameters.html#set$p$pviewSize(int, INT)

我保存的宽度和高度,并用它来改变图片。

i stored the width and height and used it to transform picture.

它不知道这是最好的解决办法,但它的工作了。

It dont know if it was the best solution, but it worked out.

这篇关于Android的 - 问题蒙山转换preVIEW架位图的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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