android拍摄视频格式的,Android拍摄视频流的格式转换（YUVRGB）

Android拍摄视频流的格式转换(YUV --- RGB)

Android允许用户实时捕获摄像头的视频流&＃xff0c;这在利用摄像头的AR应用中非常有用。可以利用摄像流实时做画面图像的分析&＃xff0c;并做出许多有用的应用。比如人脸识别&＃xff0c;条码识别&＃xff0c;特定图像替换等等&＃xff0c;不过大多数图像处理软件在处理时是需要RGB格式的图像&＃xff0c;而默认的视频流是压缩的YUV格式&＃xff0c;Android下是YUV420SP&＃xff0c;这个格式&＃xff0c;虽然可以在程序中修改&＃xff0c;但是修改后好像不起作用&＃xff0c;也就是说只能得到编码为YUV420SP的视频流&＃xff0c;这就需要把YUV420SP的视频流转换成RGB格式的图像&＃xff0c;用于图像识别。

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

final int frameSize &＃61; width * height;

if (rgbBuf &＃61;&＃61; null)

throw new NullPointerException("buffer &＃39;rgbBuf&＃39; is null");

if (rgbBuf.length

throw new IllegalArgumentException("buffer &＃39;rgbBuf&＃39; size "

&＃43; rgbBuf.length &＃43; "

if (yuv420sp &＃61;&＃61; null)

throw new NullPointerException("buffer &＃39;yuv420sp&＃39; is null");

if (yuv420sp.length

throw new IllegalArgumentException("buffer &＃39;yuv420sp&＃39; size " &＃43; yuv420sp.length

&＃43; "

int i &＃61; 0, y &＃61; 0;

int uvp &＃61; 0, u &＃61; 0, v &＃61; 0;

int y1192 &＃61; 0, r &＃61; 0, g &＃61; 0, b &＃61; 0;

for (int j &＃61; 0, yp &＃61; 0; j

uvp &＃61; frameSize &＃43; (j >> 1) * width;

u &＃61; 0;

v &＃61; 0;

for (i &＃61; 0; i

y &＃61; (0xff & ((int) yuv420sp[yp])) - 16;

if (y <0) y &＃61; 0;

if ((i & 1) &＃61;&＃61; 0) {

v &＃61; (0xff & yuv420sp[uvp&＃43;&＃43;]) - 128;

u &＃61; (0xff & yuv420sp[uvp&＃43;&＃43;]) - 128;

}

y1192 &＃61; 1192 * y;

r &＃61; (y1192 &＃43; 1634 * v);

g &＃61; (y1192 - 833 * v - 400 * u);

b &＃61; (y1192 &＃43; 2066 * u);

if (r <0) r &＃61; 0; else if (r > 262143) r &＃61; 262143;

if (g <0) g &＃61; 0; else if (g > 262143) g &＃61; 262143;

if (b <0) b &＃61; 0; else if (b > 262143) b &＃61; 262143;

rgbBuf[yp * 3] &＃61; (byte)(r >> 10);

rgbBuf[yp * 3 &＃43; 1] &＃61; (byte)(g >> 10);

rgbBuf[yp * 3 &＃43; 2] &＃61; (byte)(b >> 10);

}

}

}