我知道这个主题已经被讨论过很多次了,但是无论如何我都不能让它工作...
我想从预览中保存视图框架为jpeg文件。大概看起来是这样的(代码简化-没有额外的逻辑、异常等)...
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;
}
这是我尝试过的一种将颜色转换的方法(我相信这来自于该论坛)
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;
}
问题在于图片总是看起来像三张“奇怪的绿色图片”......我是一个新用户,所以无法发布它:(
我不知道这是否与大小有关,但我被卡住了...你能帮助我吗?