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