To express a frame rate, such as 7.5, we have to use 'numerator / denominator'.
The high 2 bytes will be used as denominator and the low 2 bytes will be used
as numerator.
To keep backward compatible, the low 2 bytes is the real frame rate when the high
2 bytes is 0.
Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
Reviewed-by: Sean V Kelley <seanvk@posteo.de>
(cherry picked from commit
1ca62cedd41ed2061c3a9ddafadc59a4692a07c9)
typedef struct _VAEncMiscParameterFrameRate
{
+ /*
+ * fps = numerator / denominator
+ * The high 2 bytes (bits 16 to 31) of framerate specifies the numerator, and
+ * the low 2 bytes (bits 0 to 15) of framerate specifies the denominator. For
+ * example, ((100 < 16 ) | 750) is 7.5 fps
+ *
+ * If the high 2 btyes is 0, the frame rate is specified by the low 2 bytes.
+ */
unsigned int framerate;
union
{