[Libva] Quality of the scaled H264 decoded image

[ykzhao]

On Thu, 2013-02-21 at 06:30 -0700, Ratin wrote:
> awesome, would like to see the result from HQ scaling sometime in the
> future. I am just using putSurface, don't want to go thru Proc
> pipeline if I don't have to. Is the performance penalty identical in
> both ways? Is there a way I can measure how much GPU processing  (%
> and such) is being utilized? 

They are implemented in different ways and it is difficult to check the
performance penalty. The putsurface is based on the 3D model while the
proc pipeline is based on GPGPU model. (Intel_gpu_top may help to show
the GPU utility, which can be downloaded from the
http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/).

Will you please check whether it can meet with your requirement if you
can use the proc VPP to do the upscaling conversion and then call the
vaPutsurface to display it?

Thanks.
    Yakui

> Thanks,
> 
> 
> Ratin 
> 
> 
> 
> On Tue, Feb 19, 2013 at 7:24 PM, Xiang, Haihao
> <haihao.xiang at intel.com> wrote:
>         
>         
>         > 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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>