libvpx: Pull from upstream

source/libvpx/vp8/encoder/ssim.c

-/*
- *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-
-#include "onyx_int.h"
-
-void vp8_ssim_parms_16x16_c
-(
-    unsigned char *s,
-    int sp,
-    unsigned char *r,
-    int rp,
-    unsigned long *sum_s,
-    unsigned long *sum_r,
-    unsigned long *sum_sq_s,
-    unsigned long *sum_sq_r,
-    unsigned long *sum_sxr
-)
-{
-    int i,j;
-    for(i=0;i<16;i++,s+=sp,r+=rp)
-     {
-         for(j=0;j<16;j++)
-         {
-             *sum_s += s[j];
-             *sum_r += r[j];
-             *sum_sq_s += s[j] * s[j];
-             *sum_sq_r += r[j] * r[j];
-             *sum_sxr += s[j] * r[j];
-         }
-     }
-}
-void vp8_ssim_parms_8x8_c
-(
-    unsigned char *s,
-    int sp,
-    unsigned char *r,
-    int rp,
-    unsigned long *sum_s,
-    unsigned long *sum_r,
-    unsigned long *sum_sq_s,
-    unsigned long *sum_sq_r,
-    unsigned long *sum_sxr
-)
-{
-    int i,j;
-    for(i=0;i<8;i++,s+=sp,r+=rp)
-     {
-         for(j=0;j<8;j++)
-         {
-             *sum_s += s[j];
-             *sum_r += r[j];
-             *sum_sq_s += s[j] * s[j];
-             *sum_sq_r += r[j] * r[j];
-             *sum_sxr += s[j] * r[j];
-         }
-     }
-}
-
-const static int64_t cc1 =  26634; // (64^2*(.01*255)^2
-const static int64_t cc2 = 239708; // (64^2*(.03*255)^2
-
-static double similarity
-(
-    unsigned long sum_s,
-    unsigned long sum_r,
-    unsigned long sum_sq_s,
-    unsigned long sum_sq_r,
-    unsigned long sum_sxr,
-    int count
-)
-{
-    int64_t ssim_n, ssim_d;
-    int64_t c1, c2;
-
-    //scale the constants by number of pixels
-    c1 = (cc1*count*count)>>12;
-    c2 = (cc2*count*count)>>12;
-
-    ssim_n = (2*sum_s*sum_r+ c1)*((int64_t) 2*count*sum_sxr-
-          (int64_t) 2*sum_s*sum_r+c2);
-
-    ssim_d = (sum_s*sum_s +sum_r*sum_r+c1)*
-        ((int64_t)count*sum_sq_s-(int64_t)sum_s*sum_s +
-        (int64_t)count*sum_sq_r-(int64_t) sum_r*sum_r +c2) ;
-
-    return ssim_n * 1.0 / ssim_d;
-}
-
-static double ssim_16x16(unsigned char *s,int sp, unsigned char *r,int rp)
-{
-    unsigned long sum_s=0,sum_r=0,sum_sq_s=0,sum_sq_r=0,sum_sxr=0;
-    vp8_ssim_parms_16x16(s, sp, r, rp, &sum_s, &sum_r, &sum_sq_s, &sum_sq_r, &sum_sxr);
-    return similarity(sum_s, sum_r, sum_sq_s, sum_sq_r, sum_sxr, 256);
-}
-static double ssim_8x8(unsigned char *s,int sp, unsigned char *r,int rp)
-{
-    unsigned long sum_s=0,sum_r=0,sum_sq_s=0,sum_sq_r=0,sum_sxr=0;
-    vp8_ssim_parms_8x8(s, sp, r, rp, &sum_s, &sum_r, &sum_sq_s, &sum_sq_r, &sum_sxr);
-    return similarity(sum_s, sum_r, sum_sq_s, sum_sq_r, sum_sxr, 64);
-}
-
-// TODO: (jbb) tried to scale this function such that we may be able to use it
-// for distortion metric in mode selection code ( provided we do a reconstruction)
-long dssim(unsigned char *s,int sp, unsigned char *r,int rp)
-{
-    unsigned long sum_s=0,sum_r=0,sum_sq_s=0,sum_sq_r=0,sum_sxr=0;
-    int64_t ssim3;
-    int64_t ssim_n1,ssim_n2;
-    int64_t ssim_d1,ssim_d2;
-    int64_t ssim_t1,ssim_t2;
-    int64_t c1, c2;
-
-    // normalize by 256/64
-    c1 = cc1*16;
-    c2 = cc2*16;
-
-    vp8_ssim_parms_16x16(s, sp, r, rp, &sum_s, &sum_r, &sum_sq_s, &sum_sq_r, &sum_sxr);
-    ssim_n1 = (2*sum_s*sum_r+ c1);
-
-    ssim_n2 =((int64_t) 2*256*sum_sxr-(int64_t) 2*sum_s*sum_r+c2);
-
-    ssim_d1 =((int64_t)sum_s*sum_s +(int64_t)sum_r*sum_r+c1);
-
-    ssim_d2 = (256 * (int64_t) sum_sq_s-(int64_t) sum_s*sum_s +
-                    (int64_t) 256*sum_sq_r-(int64_t) sum_r*sum_r +c2) ;
-
-    ssim_t1 = 256 - 256 * ssim_n1 / ssim_d1;
-    ssim_t2 = 256 - 256 * ssim_n2 / ssim_d2;
-
-    ssim3 = 256 *ssim_t1 * ssim_t2;
-    if(ssim3 <0 )
-        ssim3=0;
-    return (long)( ssim3  );
-}
-
-// We are using a 8x8 moving window with starting location of each 8x8 window
-// on the 4x4 pixel grid. Such arrangement allows the windows to overlap
-// block boundaries to penalize blocking artifacts.
-double vp8_ssim2
-(
-    unsigned char *img1,
-    unsigned char *img2,
-    int stride_img1,
-    int stride_img2,
-    int width,
-    int height
-)
-{
-    int i,j;
-    int samples =0;
-    double ssim_total=0;
-
-    // sample point start with each 4x4 location
-    for(i=0; i < height-8; i+=4, img1 += stride_img1*4, img2 += stride_img2*4)
-    {
-        for(j=0; j < width-8; j+=4 )
-        {
-            double v = ssim_8x8(img1+j, stride_img1, img2+j, stride_img2);
-            ssim_total += v;
-            samples++;
-        }
-    }
-    ssim_total /= samples;
-    return ssim_total;
-}
-double vp8_calc_ssim
-(
-    YV12_BUFFER_CONFIG *source,
-    YV12_BUFFER_CONFIG *dest,
-    int lumamask,
-    double *weight
-)
-{
-    double a, b, c;
-    double ssimv;
-
-    a = vp8_ssim2(source->y_buffer, dest->y_buffer,
-                 source->y_stride, dest->y_stride, source->y_width,
-                 source->y_height);
-
-    b = vp8_ssim2(source->u_buffer, dest->u_buffer,
-                 source->uv_stride, dest->uv_stride, source->uv_width,
-                 source->uv_height);
-
-    c = vp8_ssim2(source->v_buffer, dest->v_buffer,
-                 source->uv_stride, dest->uv_stride, source->uv_width,
-                 source->uv_height);
-
-    ssimv = a * .8 + .1 * (b + c);
-
-    *weight = 1;
-
-    return ssimv;
-}
-
-double vp8_calc_ssimg
-(
-    YV12_BUFFER_CONFIG *source,
-    YV12_BUFFER_CONFIG *dest,
-    double *ssim_y,
-    double *ssim_u,
-    double *ssim_v
-)
-{
-    double ssim_all = 0;
-    double a, b, c;
-
-    a = vp8_ssim2(source->y_buffer, dest->y_buffer,
-                 source->y_stride, dest->y_stride, source->y_width,
-                 source->y_height);
-
-    b = vp8_ssim2(source->u_buffer, dest->u_buffer,
-                 source->uv_stride, dest->uv_stride, source->uv_width,
-                 source->uv_height);
-
-    c = vp8_ssim2(source->v_buffer, dest->v_buffer,
-                 source->uv_stride, dest->uv_stride, source->uv_width,
-                 source->uv_height);
-    *ssim_y = a;
-    *ssim_u = b;
-    *ssim_v = c;
-    ssim_all = (a * 4 + b + c) /6;
-
-    return ssim_all;
-}