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https://github.com/librempeg/librempeg
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525049097c
tiny_ssim is built for the build host, not for the target platform. Therefore, it mustn't include the config.h header, which is set up specifically for the target platform and compiler. This fixes cross building for older WinStore platforms, where config.h contains "#define getenv(x) NULL". Signed-off-by: Martin Storsjö <martin@martin.st>
245 lines
7.8 KiB
C
245 lines
7.8 KiB
C
/*
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* Copyright (c) 2003-2013 Loren Merritt
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110 USA
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*/
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/*
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* tiny_ssim.c
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* Computes the Structural Similarity Metric between two rawYV12 video files.
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* original algorithm:
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* Z. Wang, A. C. Bovik, H. R. Sheikh and E. P. Simoncelli,
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* "Image quality assessment: From error visibility to structural similarity,"
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* IEEE Transactions on Image Processing, vol. 13, no. 4, pp. 600-612, Apr. 2004.
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*
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* To improve speed, this implementation uses the standard approximation of
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* overlapped 8x8 block sums, rather than the original gaussian weights.
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*/
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#include <inttypes.h>
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#include <limits.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
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#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
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#define BIT_DEPTH 8
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#define PIXEL_MAX ((1 << BIT_DEPTH)-1)
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typedef uint8_t pixel;
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/****************************************************************************
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* structural similarity metric
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****************************************************************************/
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static void ssim_4x4x2_core( const pixel *pix1, intptr_t stride1,
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const pixel *pix2, intptr_t stride2,
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int sums[2][4] )
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{
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int x,y,z;
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for( z = 0; z < 2; z++ )
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{
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uint32_t s1 = 0, s2 = 0, ss = 0, s12 = 0;
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for( y = 0; y < 4; y++ )
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for( x = 0; x < 4; x++ )
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{
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int a = pix1[x+y*stride1];
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int b = pix2[x+y*stride2];
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s1 += a;
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s2 += b;
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ss += a*a;
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ss += b*b;
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s12 += a*b;
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}
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sums[z][0] = s1;
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sums[z][1] = s2;
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sums[z][2] = ss;
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sums[z][3] = s12;
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pix1 += 4;
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pix2 += 4;
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}
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}
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static float ssim_end1( int s1, int s2, int ss, int s12 )
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{
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/* Maximum value for 10-bit is: ss*64 = (2^10-1)^2*16*4*64 = 4286582784, which will overflow in some cases.
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* s1*s1, s2*s2, and s1*s2 also obtain this value for edge cases: ((2^10-1)*16*4)^2 = 4286582784.
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* Maximum value for 9-bit is: ss*64 = (2^9-1)^2*16*4*64 = 1069551616, which will not overflow. */
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#if BIT_DEPTH > 9
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typedef float type;
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static const float ssim_c1 = .01*.01*PIXEL_MAX*PIXEL_MAX*64;
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static const float ssim_c2 = .03*.03*PIXEL_MAX*PIXEL_MAX*64*63;
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#else
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typedef int type;
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static const int ssim_c1 = (int)(.01*.01*PIXEL_MAX*PIXEL_MAX*64 + .5);
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static const int ssim_c2 = (int)(.03*.03*PIXEL_MAX*PIXEL_MAX*64*63 + .5);
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#endif
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type fs1 = s1;
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type fs2 = s2;
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type fss = ss;
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type fs12 = s12;
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type vars = fss*64 - fs1*fs1 - fs2*fs2;
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type covar = fs12*64 - fs1*fs2;
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return (float)(2*fs1*fs2 + ssim_c1) * (float)(2*covar + ssim_c2)
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/ ((float)(fs1*fs1 + fs2*fs2 + ssim_c1) * (float)(vars + ssim_c2));
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}
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static float ssim_end4( int sum0[5][4], int sum1[5][4], int width )
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{
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float ssim = 0.0;
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int i;
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for( i = 0; i < width; i++ )
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ssim += ssim_end1( sum0[i][0] + sum0[i+1][0] + sum1[i][0] + sum1[i+1][0],
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sum0[i][1] + sum0[i+1][1] + sum1[i][1] + sum1[i+1][1],
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sum0[i][2] + sum0[i+1][2] + sum1[i][2] + sum1[i+1][2],
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sum0[i][3] + sum0[i+1][3] + sum1[i][3] + sum1[i+1][3] );
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return ssim;
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}
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float ssim_plane(
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pixel *pix1, intptr_t stride1,
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pixel *pix2, intptr_t stride2,
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int width, int height, void *buf, int *cnt )
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{
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int z = 0;
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int x, y;
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float ssim = 0.0;
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int (*sum0)[4] = buf;
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int (*sum1)[4] = sum0 + (width >> 2) + 3;
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width >>= 2;
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height >>= 2;
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for( y = 1; y < height; y++ )
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{
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for( ; z <= y; z++ )
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{
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FFSWAP( void*, sum0, sum1 );
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for( x = 0; x < width; x+=2 )
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ssim_4x4x2_core( &pix1[4*(x+z*stride1)], stride1, &pix2[4*(x+z*stride2)], stride2, &sum0[x] );
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}
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for( x = 0; x < width-1; x += 4 )
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ssim += ssim_end4( sum0+x, sum1+x, FFMIN(4,width-x-1) );
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}
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// *cnt = (height-1) * (width-1);
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return ssim / ((height-1) * (width-1));
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}
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uint64_t ssd_plane( const uint8_t *pix1, const uint8_t *pix2, int size )
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{
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uint64_t ssd = 0;
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int i;
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for( i=0; i<size; i++ )
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{
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int d = pix1[i] - pix2[i];
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ssd += d*d;
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}
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return ssd;
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}
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static double ssd_to_psnr( uint64_t ssd, uint64_t denom )
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{
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return -10*log((double)ssd/(denom*255*255))/log(10);
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}
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static double ssim_db( double ssim, double weight )
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{
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return 10*(log(weight)/log(10)-log(weight-ssim)/log(10));
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}
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static void print_results(uint64_t ssd[3], double ssim[3], int frames, int w, int h)
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{
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printf( "PSNR Y:%.3f U:%.3f V:%.3f All:%.3f | ",
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ssd_to_psnr( ssd[0], (uint64_t)frames*w*h ),
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ssd_to_psnr( ssd[1], (uint64_t)frames*w*h/4 ),
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ssd_to_psnr( ssd[2], (uint64_t)frames*w*h/4 ),
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ssd_to_psnr( ssd[0] + ssd[1] + ssd[2], (uint64_t)frames*w*h*3/2 ) );
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printf( "SSIM Y:%.5f U:%.5f V:%.5f All:%.5f (%.5f)",
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ssim[0] / frames,
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ssim[1] / frames,
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ssim[2] / frames,
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(ssim[0]*4 + ssim[1] + ssim[2]) / (frames*6),
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ssim_db(ssim[0] * 4 + ssim[1] + ssim[2], frames*6));
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}
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int main(int argc, char* argv[])
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{
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FILE *f[2];
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uint8_t *buf[2], *plane[2][3];
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int *temp;
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uint64_t ssd[3] = {0,0,0};
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double ssim[3] = {0,0,0};
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int frame_size, w, h;
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int frames, seek;
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int i;
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if( argc<4 || 2 != sscanf(argv[3], "%dx%d", &w, &h) )
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{
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printf("tiny_ssim <file1.yuv> <file2.yuv> <width>x<height> [<seek>]\n");
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return -1;
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}
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f[0] = fopen(argv[1], "rb");
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f[1] = fopen(argv[2], "rb");
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sscanf(argv[3], "%dx%d", &w, &h);
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if (w<=0 || h<=0 || w*(int64_t)h >= INT_MAX/3 || 2LL*w+12 >= INT_MAX / sizeof(*temp)) {
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fprintf(stderr, "Dimensions are too large, or invalid\n");
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return -2;
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}
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frame_size = w*h*3LL/2;
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for( i=0; i<2; i++ )
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{
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buf[i] = malloc(frame_size);
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plane[i][0] = buf[i];
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plane[i][1] = plane[i][0] + w*h;
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plane[i][2] = plane[i][1] + w*h/4;
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}
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temp = malloc((2*w+12)*sizeof(*temp));
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seek = argc<5 ? 0 : atoi(argv[4]);
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fseek(f[seek<0], seek < 0 ? -seek : seek, SEEK_SET);
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for( frames=0;; frames++ )
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{
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uint64_t ssd_one[3];
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double ssim_one[3];
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if( fread(buf[0], frame_size, 1, f[0]) != 1) break;
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if( fread(buf[1], frame_size, 1, f[1]) != 1) break;
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for( i=0; i<3; i++ )
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{
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ssd_one[i] = ssd_plane ( plane[0][i], plane[1][i], w*h>>2*!!i );
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ssim_one[i] = ssim_plane( plane[0][i], w>>!!i,
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plane[1][i], w>>!!i,
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w>>!!i, h>>!!i, temp, NULL );
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ssd[i] += ssd_one[i];
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ssim[i] += ssim_one[i];
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}
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printf("Frame %d | ", frames);
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print_results(ssd_one, ssim_one, 1, w, h);
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printf(" \r");
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fflush(stdout);
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}
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if( !frames ) return 0;
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printf("Total %d frames | ", frames);
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print_results(ssd, ssim, frames, w, h);
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printf("\n");
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return 0;
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}
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