According to my understanding, VAConfigAttribRTFormat is used to describe the
surface sample format, for example YUV420 , YUV422, RGB32, and
VASurfaceAtrribPixelFormat aims to specify the detailed pixel storage layout,
for example, one YUV420 surface can be stored with YV12/NV12/I420 pixel format
and one RGB32 surface can be stored with RGBA/ARGB pixel format.
You can query whether VA_RT_FORMAT_RGB32 is supported as a render
target format through "vaGetConfigAttributes()", if supported, you can specify
the BGRA fourcc when creating a render target surface.
Usually , video decoder only support YUV420 as decoding output, one
color conversion is need to get BGRA surface.
Thanks,
Xiaowei
From: [email protected]
[mailto:[email protected]] On Behalf
Of Ratin
Sent: Tuesday, January 29, 2013 6:19 AM
To: [email protected]
Subject: [Libva] VAConfigAttribRTFormat
Hi got a question:
I noticed that the #define values for for VAConfigAttribRTFormat in
VAConfigAttrib does not include BGRA or ARGB formats (it does RGB 16 and
RGB32), but the VASurfaceAttrib's VASurfaceAttribPixelFormat does allow it thru
a four_cc value. Does that mean I can't decode the H.264 bitstream data
directly to a BGRA surface, I have to convert explicitly?
/* attribute value for VAConfigAttribRTFormat */
#define VA_RT_FORMAT_YUV420 0x00000001
#define VA_RT_FORMAT_YUV422 0x00000002
#define VA_RT_FORMAT_YUV444 0x00000004
#define VA_RT_FORMAT_YUV411 0x00000008
#define VA_RT_FORMAT_YUV400 0x00000010
#define VA_RT_FORMAT_RGB16 0x00010000
#define VA_RT_FORMAT_RGB32 0x00020000
#define VA_RT_FORMAT_PROTECTED 0x80000000
Thanks
Ratin
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