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How to convert argb to nv21 (yuv420sp) in Android ndk?

720 * 1280 ask if I should go to the following parameters api to change the color format of the image size. 

argb image data size is 3,686,400. 
(width : 720 
height : 1280 
bitPerPixel : 32 
bytePerPexel: 4)

Api is down https://code.google.com/p/libyuv/ 

int ARGBToNV21 (const uint8 * src_argb, int src_stride_argb, 
                uint8 * dst_y, int dst_stride_y, 
                uint8 * dst_vu, int dst_stride_vu, 
                int width, int height);

What is the meaning of the parameters? int src_stride_argb? int dst_stride_y? int int dst_stride_vu?

Please help with a simple example.

Choco
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aespki
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1 Answers1

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dst_stride_argb number of bytes in a row of the dst_argb plane.
Normally this would be the same as dst_width, with recommended alignment to 16 bytes for better efficiency.
If rotation of 90 or 270 is used, stride is affected. The caller should allocate the buffer according to rotation.

dst_stride_y number of bytes in a row of the dst_y plane.
If rotation of 90 or 270 is used, stride is affected.

(Taken from convert_argb.h, with some modifications)

Michael
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