git.sesse.net Git - mlt/blob - src/modules/qt/transition_vqm.cpp

   1 /*
   2  * transition_vqm.c -- video quality measurement
   3  * Copyright (c) 2012 Dan Dennedy <dan@dennedy.org>
   4  * Core psnr and ssim routines based on code from
   5  *   qsnr (C) 2010 E. Oriani, ema <AT> fastwebnet <DOT> it
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program. If not, see <http://www.gnu.org/licenses/>
  19  */
  20
  21 #include "common.h"
  22 #include <framework/mlt.h>
  23 #include <string.h>
  24 #include <math.h>
  25 #include <stdio.h>
  26 #include <QImage>
  27 #include <QColor>
  28 #include <QPainter>
  29 #include <QPalette>
  30 #include <QFont>
  31 #include <QString>
  32
  33 static double calc_psnr( const uint8_t *a, const uint8_t *b, int size, int bpp )
  34 {
  35         double mse = 0.0;
  36         int n = size + 1;
  37
  38         while ( --n )
  39         {
  40                 int diff = *a - *b;
  41                 mse += diff * diff;
  42                 a += bpp;
  43                 b += bpp;
  44         }
  45
  46         return 10.0 * log10( 255.0 * 255.0 / ( mse == 0 ? 1e-10 : mse/size ) );
  47 }
  48
  49 static double calc_ssim( const uint8_t *a, const uint8_t *b, int width, int height, int window_size, int bpp )
  50 {
  51         int     windows_x = width / window_size;
  52         int windows_y = height / window_size;
  53         double  avg = 0.0;
  54
  55         if ( !windows_x || !windows_y )
  56                 return 0.0;
  57
  58         // for each window
  59         for ( int y = 0; y < windows_y; ++y )
  60                 for ( int x = 0; x < windows_x; ++x )
  61                 {
  62                         int     base_offset = x * window_size + y * window_size * width;
  63                         double  ref_acc = 0.0,
  64                                         ref_acc_2 = 0.0,
  65                                         cmp_acc = 0.0,
  66                                         cmp_acc_2 = 0.0,
  67                                         ref_cmp_acc = 0.0;
  68
  69                         // accumulate the pixel values for this window
  70                         for ( int j = 0; j < window_size; ++j )
  71                                 for ( int i = 0; i < window_size; ++i )
  72                                 {
  73                                         uint8_t c_a = a[bpp * (base_offset + j * width + i)];
  74                                         uint8_t c_b = b[bpp * (base_offset + j * width + i)];
  75                                         ref_acc += c_a;
  76                                         ref_acc_2 += c_a * c_a;
  77                                         cmp_acc += c_b;
  78                                         cmp_acc_2 += c_b * c_b;
  79                                         ref_cmp_acc += c_a * c_b;
  80                                 }
  81
  82                         // compute the SSIM for this window
  83                         // http://en.wikipedia.org/wiki/SSIM
  84                         // http://en.wikipedia.org/wiki/Variance
  85                         // http://en.wikipedia.org/wiki/Covariance
  86                         double n_samples = window_size * window_size,
  87                                         ref_avg = ref_acc / n_samples,
  88                                         ref_var = ref_acc_2 / n_samples - ref_avg * ref_avg,
  89                                         cmp_avg = cmp_acc / n_samples,
  90                                         cmp_var = cmp_acc_2 / n_samples - cmp_avg * cmp_avg,
  91                                         ref_cmp_cov = ref_cmp_acc / n_samples - ref_avg * cmp_avg,
  92                                         c1 = 6.5025, // (0.01*255.0)^2
  93                                         c2 = 58.5225, // (0.03*255)^2
  94                                         ssim_num = (2.0 * ref_avg * cmp_avg + c1) * (2.0 * ref_cmp_cov + c2),
  95                                         ssim_den = (ref_avg * ref_avg + cmp_avg * cmp_avg + c1) * (ref_var + cmp_var + c2);
  96
  97                         // accumulate the SSIM
  98                         avg += ssim_num / ssim_den;
  99                 }
 100
 101         // return the average SSIM
 102         return avg / windows_x / windows_y;
 103 }
 104
 105 static int get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 106 {
 107         mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
 108         mlt_properties properties = MLT_FRAME_PROPERTIES( a_frame );
 109         mlt_transition transition = MLT_TRANSITION( mlt_frame_pop_service( a_frame ) );
 110         uint8_t *b_image;
 111         int window_size = mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( transition ), "window_size" );
 112         double psnr[3], ssim[3];
 113
 114         *format = mlt_image_yuv422;
 115         mlt_frame_get_image( b_frame, &b_image, format, width, height, writable );
 116         mlt_frame_get_image( a_frame, image, format, width, height, writable );
 117
 118         psnr[0] = calc_psnr( *image, b_image, *width * *height, 2 );
 119         psnr[1] = calc_psnr( *image + 1, b_image + 1, *width * *height / 2, 4 );
 120         psnr[2] = calc_psnr( *image + 3, b_image + 3, *width * *height / 2, 4 );
 121         ssim[0] = calc_ssim( *image, b_image, *width, *height, window_size, 2 );
 122         ssim[1] = calc_ssim( *image + 1, b_image + 1, *width / 2, *height, window_size, 4 );
 123         ssim[2] = calc_ssim( *image + 3, b_image + 3, *width / 2, *height, window_size, 4 );
 124         mlt_properties_set_double( properties, "meta.vqm.psnr.y", psnr[0] );
 125         mlt_properties_set_double( properties, "meta.vqm.psnr.cb", psnr[1] );
 126         mlt_properties_set_double( properties, "meta.vqm.psnr.cr", psnr[2] );
 127         mlt_properties_set_double( properties, "meta.vqm.ssim.y", ssim[0] );
 128         mlt_properties_set_double( properties, "meta.vqm.ssim.cb", ssim[1] );
 129         mlt_properties_set_double( properties, "meta.vqm.ssim.cr", ssim[2] );
 130         printf( "%05d %05.2f %05.2f %05.2f %5.3f %5.3f %5.3f\n",
 131                         mlt_frame_get_position( a_frame ), psnr[0], psnr[1], psnr[2],
 132                         ssim[0], ssim[1], ssim[2] );
 133
 134         // copy the B frame to the bottom of the A frame for comparison
 135         window_size = mlt_image_format_size( *format, *width, *height, NULL ) / 2;
 136         memcpy( *image + window_size, b_image + window_size, window_size );
 137
 138         if ( !mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( transition ), "render" ) )
 139                 return 0;
 140
 141         // get RGBA image for Qt drawing
 142         *format = mlt_image_rgb24a;
 143         mlt_frame_get_image( a_frame, image, format, width, height, 1 );
 144
 145         // convert mlt image to qimage
 146         QImage img( *width, *height, QImage::Format_ARGB32 );
 147         int y = *height + 1;
 148         uint8_t *src = *image;
 149         while ( --y )
 150         {
 151                 QRgb *dst = (QRgb*) img.scanLine( *height - y );
 152                 int x = *width + 1;
 153                 while ( --x )
 154                 {
 155                         *dst++ = qRgba( src[0], src[1], src[2], 255 );
 156                         src += 4;
 157                 }
 158         }
 159
 160         // setup Qt drawing
 161         QPainter painter;
 162         painter.begin( &img );
 163         painter.setRenderHints( QPainter::Antialiasing | QPainter::TextAntialiasing | QPainter::HighQualityAntialiasing );
 164
 165         // draw some stuff with Qt
 166         QPalette palette;
 167         QFont font;
 168         QString s;
 169         font.setBold( true );
 170         font.setPointSize( 30 * *height / 1080 );
 171         painter.setPen( QColor("black") );
 172         painter.drawLine( 0, *height/2 + 1, *width, *height/2 );
 173         painter.setPen( QColor("white") );
 174         painter.drawLine( 0, *height/2 - 1, *width, *height/2 );
 175         painter.setFont( font );
 176         s.sprintf( "Frame: %05d\nPSNR:   %05.2f (Y) %05.2f (Cb) %05.2f (Cr)\nSSIM:    %5.3f (Y) %5.3f (Cb) %5.3f (Cr)",
 177                           mlt_frame_get_position( a_frame ), psnr[0], psnr[1], psnr[2],
 178                           ssim[0], ssim[1], ssim[2] );
 179         painter.setPen( QColor("black") );
 180         painter.drawText( 52, *height * 8 / 10 + 2, *width, *height, 0, s );
 181         painter.setPen( QColor("white") );
 182         painter.drawText( 50, *height * 8 / 10, *width, *height, 0, s );
 183
 184         // finish Qt drawing
 185         painter.end();
 186         window_size = mlt_image_format_size( *format, *width, *height, NULL );
 187         uint8_t *dst = (uint8_t *) mlt_pool_alloc( window_size );
 188         mlt_properties_set_data( MLT_FRAME_PROPERTIES(a_frame), "image", dst, window_size, mlt_pool_release, NULL );
 189         *image = dst;
 190
 191         // convert qimage to mlt
 192         y = *height + 1;
 193         while ( --y )
 194         {
 195                 QRgb *src = (QRgb*) img.scanLine( *height - y );
 196                 int x = *width + 1;
 197                 while ( --x )
 198                 {
 199                         *dst++ = qRed( *src );
 200                         *dst++ = qGreen( *src );
 201                         *dst++ = qBlue( *src );
 202                         *dst++ = qAlpha( *src );
 203                         src++;
 204                 }
 205         }
 206
 207         return 0;
 208 }
 209
 210 static mlt_frame process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
 211 {
 212         mlt_frame_push_service( a_frame, transition );
 213         mlt_frame_push_frame( a_frame, b_frame );
 214         mlt_frame_push_get_image( a_frame, get_image );
 215
 216         return a_frame;
 217 }
 218
 219 extern "C" {
 220
 221 mlt_transition transition_vqm_init( mlt_profile profile, mlt_service_type type, const char *id, void *arg )
 222 {
 223         mlt_transition transition = mlt_transition_new();
 224
 225         if ( transition )
 226         {
 227                 mlt_properties properties = MLT_TRANSITION_PROPERTIES( transition );
 228
 229                 if ( !createQApplicationIfNeeded( MLT_TRANSITION_SERVICE(transition) ) )
 230                 {
 231                         mlt_transition_close( transition );
 232                         return NULL;
 233                 }
 234                 transition->process = process;
 235                 mlt_properties_set_int( properties, "_transition_type", 1 ); // video only
 236                 mlt_properties_set_int( properties, "window_size", 8 );
 237                 printf( "frame psnr[Y] psnr[Cb] psnr[Cr] ssim[Y] ssim[Cb] ssim[Cr]\n" );
 238         }
 239
 240         return transition;
 241 }
 242
 243 } // extern "C"