[Libva] Quality of the scaled H264 decoded image

[Xiang, Haihao]

> I am using Intel_driver from the staging branch, on a Gen 3 HD4000. So
> there other algorithms like bi-cubic is not supported?

You can select another scaling method other than the default method via
the flag to vaPutSurface() or the filter_flag in
VAProcPipelineParameterBuffer.

/* Scaling flags for vaPutSurface() */
#define VA_FILTER_SCALING_DEFAULT       0x00000000
#define VA_FILTER_SCALING_FAST          0x00000100
#define VA_FILTER_SCALING_HQ            0x00000200
#define VA_FILTER_SCALING_NL_ANAMORPHIC 0x00000300
#define VA_FILTER_SCALING_MASK          0x00000f00

In VAProcPipelineParameterBuffer:

    * - Scaling: \c VA_FILTER_SCALING_DEFAULT, \c VA_FILTER_SCALING_FAST,                                                                                             
     *   \c VA_FILTER_SCALING_HQ, \c VA_FILTER_SCALING_NL_ANAMORPHIC.                                                                                                  
     */
    unsigned int        filter_flags;

For Inter driver, Currently only VA_FILTER_SCALING_NL_ANAMORPHIC and
VA_FILTER_SCALING_DEFAULT/VA_FILTER_SCALING_FAST  are supported.  We
will add the support for VA_FILTER_SCALING_HQ.

Thanks
Haihao

> 
> 
> 
> On Mon, Feb 18, 2013 at 12:11 AM, Xiang, Haihao
> <haihao.xiang at intel.com> wrote:
>         On Fri, 2013-02-15 at 16:18 -0800, Ratin wrote:
>         > I am decoding a 720 P video stream from a camera to 1080 P
>         surfaces
>         > and displaying them on the screen. I am seeing noticable
>         noise and
>         > pulsating which is directly related to the I frame interval
>         > (aparently), the lowest I-frame interval I can specify for
>         the camera
>         > is  1 second and selecting that in addition to bitrate of
>         8192 kbps
>         > makes is slightly better but still a lot of noise. A
>         software
>         > decoded/scaled video looks all smooth.
>         >
>         >
>         > What I am wondering is what's the default scaling algorithm
>         being used
>         > in vaapi/intel driver and how do I specify better scaling
>         algorithms
>         > like bi-cubic etc.and possibly specify the strength of
>         deblocking
>         > filter level as well, and what can I do to reduce the
>         pulsating ?
>         
>         
>         Which driver are you using ? For Intel, it is bilinear. 
>         
>         >
>         >
>         >
>         >
>         > Any input would be much appreciated.
>         >
>         >
>         > Thanks
>         >
>         >
>         > Ratin
>         >
>         >
>         
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>         
>         
> 
>