android 视频流的格式转换（YUV-RGB）

http://chenweihuacwh.iteye.com/blog/571223

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  static public void decodeYUV420SP(byte[] rgbBuf, byte[] yuv420sp, int width, int height) {      final int frameSize = width * height;  if (rgbBuf == null)      throw new NullPointerException("buffer 'rgbBuf' is null");  if (rgbBuf.length < frameSize * 3)      throw new IllegalArgumentException("buffer 'rgbBuf' size "              + rgbBuf.length + " < minimum " + frameSize * 3);    if (yuv420sp == null)      throw new NullPointerException("buffer 'yuv420sp' is null");    if (yuv420sp.length < frameSize * 3 / 2)      throw new IllegalArgumentException("buffer 'yuv420sp' size " + yuv420sp.length              + " < minimum " + frameSize * 3 / 2);            int i = 0, y = 0;      int uvp = 0, u = 0, v = 0;      int y1192 = 0, r = 0, g = 0, b = 0;            for (int j = 0, yp = 0; j < height; j++) {          uvp = frameSize + (j >> 1) * width;          u = 0;          v = 0;          for (i = 0; i < width; i++, yp++) {              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;              }                            y1192 = 1192 * y;              r = (y1192 + 1634 * v);              g = (y1192 - 833 * v - 400 * u);              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;                            rgbBuf[yp * 3] = (byte)(r >> 10);              rgbBuf[yp * 3 + 1] = (byte)(g >> 10);              rgbBuf[yp * 3 + 2] = (byte)(b >> 10);          }      }    }

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