一、YUV格式

YUV 表示三個分量， Y 表示 亮度(Luminance)，即灰度值，UV表示色度(Chrominance)，描述圖像色彩和飽和度，指定顏色。YUV格式有YUV444、 YUV422 和 YUV420 三種，差別在于：

YUV444： 每個Y分量對應一組UV分量

YUV422：每兩個Y分量共用一組UV分量

YUV420：每四個Y分量共用一組UV分量

二、YUV444格式

YUV444P像素存儲

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像素存儲

4、YUV422SP格式(平面格式) : YUV422SemiPlanar

YUV422SP像素存儲

四、YUV420格式

YUV420格式分為 YUV420P 和 YUV420SP兩種。

其中YUV420P格式，分為I420 和 YV12 兩種，YUV420SP格式分為NV12 和 NV21 兩種。他們的存儲格式，區別如下：

YUV420P(I420)像素存儲：

YUV420P(I420)像素存儲

YUV420P(YV12)像素存儲， 跟I420的UV存儲順序相反：

YUV420P(YV12)像素存儲

YUV420SP(NV12)像素存儲，UV分量交織存儲:

YUV420SP(NV12)像素存儲

YUV420SP(NV21)像素存儲，UV分量交織存儲，跟NV12的UV分量相反：

YUV420SP(NV21)像素存儲

攝像頭采集到的數據是RGB24的格式，RGB24 一幀的大小是 width x height x 3Bit， RGB32 一幀的大小則是width x height x 4Bit。YUV420 一幀的大小是 width x height x 1.5Bit。

Android 中的格式定義如下：

/**

* 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 */

/**

* the actual colorformat will be relayed by the

* Gralloc Buffers.

* FIXME: In the process of reserving some enum values for

* Android-specific OMX IL colorformats. Change this enum to

* an acceptable range once that is done.

* */

OMX_COLOR_FormatAndroidOpaque = 0x7F000789,

OMX_TI_COLOR_FormatYUV420PackedSemiPlanar = 0x7F000100,

OMX_QCOM_COLOR_FormatYVU420SemiPlanar = 0x7FA30C00,

OMX_QCOM_COLOR_FormatYUV420PackedSemiPlanar64x32Tile2m8ka = 0x7FA30C03,

OMX_SEC_COLOR_FormatNV12Tiled = 0x7FC00002,

OMX_QCOM_COLOR_FormatYUV420PackedSemiPlanar32m = 0x7FA30C04,

OMX_COLOR_FormatMax = 0x7FFFFFFF

} OMX_COLOR_FORMATTYPE;

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