[x265] [PATCH] analysis:add logic for calculate qp for a given cu size

[Sreelakshmy Govindan]

Thanks Steve. I will make the changes and resend the patch.


Regards,
Sreelakshmy

On Thu, Mar 12, 2015 at 9:32 AM, Steve Borho <steve at borho.org> wrote:

> On Wed, Mar 11, 2015 at 10:36 PM,  <sreelakshmy at multicorewareinc.com>
> wrote:
> > # HG changeset patch
> > # User Sreelakshmy V G <sreelakshmy at multicorewareinc.com>
> > # Date 1426131126 -19800
> > #      Thu Mar 12 09:02:06 2015 +0530
> > # Node ID c7182de7496906e81b57cb94278d60cbcc446648
> > # Parent  b931c50d55011a1ddc08f0a230b9632fcb4674d7
> > analysis:add logic for calculate qp for a given cu size
>
> the commit message should mention that the commit is adding the
> function but that it is not yet used, for the convenience of reviewers
>
> > diff -r b931c50d5501 -r c7182de74969 source/encoder/analysis.cpp
> > --- a/source/encoder/analysis.cpp       Wed Mar 11 21:58:02 2015 -0500
> > +++ b/source/encoder/analysis.cpp       Thu Mar 12 09:02:06 2015 +0530
> > @@ -1895,3 +1895,41 @@
> >
> >      return false;
> >  }
> > +
> > +int Analysis::calculateQpforCuSize(CUData& ctu, const CUGeom& cuGeom)
> > +{
> > +    x265_emms();
>
> it doesn't appear that this function needs to use floats, so EMMS
> should eventually be unnecessary
>
> > +    int depth = cuGeom.depth;
> > +    uint32_t ctuAddr;
> > +    ctuAddr = ctu.m_cuAddr;
> > +    double qp = m_frame->m_encData->m_avgQpRc;
> > +
> > +    uint32_t width = m_frame->m_fencPic->m_picWidth;
> > +    uint32_t height = m_frame->m_fencPic->m_picHeight;
> > +    uint32_t block_x = ctu.m_cuPelX + g_zscanToPelX[cuGeom.absPartIdx];
> > +    uint32_t block_y = ctu.m_cuPelY + g_zscanToPelY[cuGeom.absPartIdx];
> > +    uint32_t maxCols = (m_frame->m_fencPic->m_picWidth + (16 - 1)) / 16;
> > +    uint32_t blockSize = g_maxCUSize / (uint32_t)pow(2, depth);
>
> g_maxCUSize >> cuGeom.depth
>
> > +    double qp_offset = 0;
> > +    uint32_t cnt = 0;
> > +    uint32_t idx;
> > +
> > +    /* Use cuTree offsets if cuTree enabled and frame is referenced,
> else use AQ offsets */
> > +    bool isReferenced = IS_REFERENCED(m_frame);
> > +    double *qpoffs = (isReferenced && m_param->rc.cuTree) ?
> m_frame->m_lowres.qpCuTreeOffset : m_frame->m_lowres.qpAqOffset;
>
> the lookahead is generating FIX8 versions of these values, so integer
> math can be used in later parts of the encoder.
>
> > +    for (uint32_t block_yy = block_y; block_yy < block_y + blockSize &&
> block_yy < height; block_yy += 16)
> > +    {
> > +        for (uint32_t block_xx = block_x; block_xx < block_x +
> blockSize && block_xx < width; block_xx += 16)
> > +        {
> > +            idx = ((block_yy / 16) * (maxCols)) + (block_xx / 16);
> > +            qp_offset += qpoffs[idx];
> > +            cnt++;
> > +        }
> > +    }
> > +
> > +    qp_offset /= cnt;
> > +    qp += qp_offset;
> > +    return x265_clip3(QP_MIN, QP_MAX_MAX, (int)(qp + 0.5));
> > +}
> > +
> > diff -r b931c50d5501 -r c7182de74969 source/encoder/analysis.h
> > --- a/source/encoder/analysis.h Wed Mar 11 21:58:02 2015 -0500
> > +++ b/source/encoder/analysis.h Thu Mar 12 09:02:06 2015 +0530
> > @@ -139,6 +139,8 @@
> >      /* generate residual and recon pixels for an entire CTU recursively
> (RD0) */
> >      void encodeResidue(const CUData& parentCTU, const CUGeom& cuGeom);
> >
> > +    int calculateQpforCuSize(CUData& ctu, const CUGeom& cuGeom);
> > +
> >      /* check whether current mode is the new best */
> >      inline void checkBestMode(Mode& mode, uint32_t depth)
> >      {
> > _______________________________________________
> > x265-devel mailing list
> > x265-devel at videolan.org
> > https://mailman.videolan.org/listinfo/x265-devel
>
>
>
> --
> Steve Borho
> _______________________________________________
> x265-devel mailing list
> x265-devel at videolan.org
> https://mailman.videolan.org/listinfo/x265-devel
>
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