一、YUV格式
YUV 表示三个分量， Y 表示 亮度（Luminance），即灰度值，UV表示色度（Chrominance），描述图像色彩和饱和度，指定颜色。YUV格式有YUV444、 YUV422 和 YUV420 三种，差别在于：
YUV444： 每个Y分量对应一组UV分量
YUV422：每两个Y分量共用一组UV分量
YUV420：每四个Y分量共用一组UV分量
二、YUV444格式
YUV444P像素存储
三、YUV422格式
1、YCbYCr(YUYV)格式 (打包格式)
YUV422(YUYV)格式
2、CbYCrY(UYVY)格式 (打包格式)
YUV422(I422/UYVY)格式
3、YUV422P格式 (平面格式) : YUV422Planar
YUV422P像素存储
4、YUV422SP格式(平面格式) : YUV422SemiPlanar
YUV422SP像素存储
四、YUV420格式
YUV420格式分为 YUV420P 和 YUV420SP两种。
其中YUV420P格式，分为I420 和 YV12 两种，YUV420SP格式分为NV12 和 NV21 两种。他们的存储格式，区别如下：
YUV420P(I420)像素存储：
YUV420P(I420)像素存储
YUV420P(YV12)像素存储， 跟I420的UV存储顺序相反：
YUV420P(YV12)像素存储
YUV420SP(NV12)像素存储，UV分量交织存储:
YUV420SP(NV12)像素存储
YUV420SP(NV21)像素存储，UV分量交织存储，跟NV12的UV分量相反：
YUV420SP(NV21)像素存储
摄像头采集到的数据是RGB24的格式，RGB24 一帧的大小是 width x height x 3Bit， RGB32 一帧的大小则是width x height x 4Bit。YUV420 一帧的大小是 width x height x 1.5Bit。
Android 中的格式定义如下：
/**
* Enumeration defining possible uncompressed image/video formats.
*
* ENUMS:
* Unused : Placeholder value when format is N/A
* Monochrome : black and white
* 8bitRGB332 : Red 7:5, Green 4:2, Blue 1:0
* 12bitRGB444 : Red 11:8, Green 7:4, Blue 3:0
* 16bitARGB4444 : Alpha 15:12, Red 11:8, Green 7:4, Blue 3:0
* 16bitARGB1555 : Alpha 15, Red 14:10, Green 9:5, Blue 4:0
* 16bitRGB565 : Red 15:11, Green 10:5, Blue 4:0
* 16bitBGR565 : Blue 15:11, Green 10:5, Red 4:0
* 18bitRGB666 : Red 17:12, Green 11:6, Blue 5:0
* 18bitARGB1665 : Alpha 17, Red 16:11, Green 10:5, Blue 4:0
* 19bitARGB1666 : Alpha 18, Red 17:12, Green 11:6, Blue 5:0
* 24bitRGB888 : Red 24:16, Green 15:8, Blue 7:0
* 24bitBGR888 : Blue 24:16, Green 15:8, Red 7:0
* 24bitARGB1887 : Alpha 23, Red 22:15, Green 14:7, Blue 6:0
* 25bitARGB1888 : Alpha 24, Red 23:16, Green 15:8, Blue 7:0
* 32bitBGRA8888 : Blue 31:24, Green 23:16, Red 15:8, Alpha 7:0
* 32bitARGB8888 : Alpha 31:24, Red 23:16, Green 15:8, Blue 7:0
* YUV411Planar : U,Y are subsampled by a factor of 4 horizontally
* YUV411PackedPlanar : packed per payload in planar slices
* YUV420Planar : Three arrays Y,U,V.
* YUV420PackedPlanar : packed per payload in planar slices
* YUV420SemiPlanar : Two arrays, one is all Y, the other is U and V
* YUV422Planar : Three arrays Y,U,V.
* YUV422PackedPlanar : packed per payload in planar slices
* YUV422SemiPlanar : Two arrays, one is all Y, the other is U and V
* YCbYCr : Organized as 16bit YUYV (i.e. YCbYCr)
* YCrYCb : Organized as 16bit YVYU (i.e. YCrYCb)
* CbYCrY : Organized as 16bit UYVY (i.e. CbYCrY)
* CrYCbY : Organized as 16bit VYUY (i.e. CrYCbY)
* YUV444Interleaved : Each pixel contains equal parts YUV
* RawBayer8bit : SMIA camera output format
* RawBayer10bit : SMIA camera output format
* RawBayer8bitcompressed : SMIA camera output format
*/
typedef enum OMX_COLOR_FORMATTYPE {
OMX_COLOR_FormatUnused,
OMX_COLOR_FormatMonochrome,
OMX_COLOR_Format8bitRGB332,
OMX_COLOR_Format12bitRGB444,
OMX_COLOR_Format16bitARGB4444,
OMX_COLOR_Format16bitARGB1555,
OMX_COLOR_Format16bitRGB565,
OMX_COLOR_Format16bitBGR565,
OMX_COLOR_Format18bitRGB666,
OMX_COLOR_Format18bitARGB1665,
OMX_COLOR_Format19bitARGB1666,
OMX_COLOR_Format24bitRGB888,
OMX_COLOR_Format24bitBGR888,
OMX_COLOR_Format24bitARGB1887,
OMX_COLOR_Format25bitARGB1888,
OMX_COLOR_Format32bitBGRA8888,
OMX_COLOR_Format32bitARGB8888,
OMX_COLOR_FormatYUV411Planar,
OMX_COLOR_FormatYUV411PackedPlanar,
OMX_COLOR_FormatYUV420Planar,
OMX_COLOR_FormatYUV420PackedPlanar,
OMX_COLOR_FormatYUV420SemiPlanar,
OMX_COLOR_FormatYUV422Planar,
OMX_COLOR_FormatYUV422PackedPlanar,
OMX_COLOR_FormatYUV422SemiPlanar,
OMX_COLOR_FormatYCbYCr,
OMX_COLOR_FormatYCrYCb,
OMX_COLOR_FormatCbYCrY,
OMX_COLOR_FormatCrYCbY,
OMX_COLOR_FormatYUV444Interleaved,
OMX_COLOR_FormatRawBayer8bit,
OMX_COLOR_FormatRawBayer10bit,
OMX_COLOR_FormatRawBayer8bitcompressed,
OMX_COLOR_FormatL2,
OMX_COLOR_FormatL4,
OMX_COLOR_FormatL8,
OMX_COLOR_FormatL16,
OMX_COLOR_FormatL24,
OMX_COLOR_FormatL32,
OMX_COLOR_FormatYUV420PackedSemiPlanar,
OMX_COLOR_FormatYUV422PackedSemiPlanar,
OMX_COLOR_Format18BitBGR666,
OMX_COLOR_Format24BitARGB6666,
OMX_COLOR_Format24BitABGR6666,
OMX_COLOR_FormatKhronosExtensions = 0x6F000000, /**< Reserved region for introducing Khronos Standard Extensions */
OMX_COLOR_FormatVendorStartUnused = 0x7F000000, /**< Reserved region for introducing Vendor Extensions */
/**