git.sesse.net Git - mlt/blob - src/modules/qimage/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 <framework/mlt.h>
  22 #include <string.h>
  23 #include <math.h>
  24 #include <stdio.h>
  25 #include <QtGui/QtGui>
  26
  27 static QApplication *app = 0;
  28
  29 static double calc_psnr( const uint8_t *a, const uint8_t *b, int size, int bpp )
  30 {
  31         double mse = 0.0;
  32         int n = size + 1;
  33
  34         while ( --n )
  35         {
  36                 int diff = *a - *b;
  37                 mse += diff * diff;
  38                 a += bpp;
  39                 b += bpp;
  40         }
  41
  42         return 10.0 * log10( 255.0 * 255.0 / ( mse == 0 ? 1e-10 : mse/size ) );
  43 }
  44
  45 static double calc_ssim( const uint8_t *a, const uint8_t *b, int width, int height, int window_size, int bpp )
  46 {
  47         int     windows_x = width / window_size;
  48         int windows_y = height / window_size;
  49         double  avg = 0.0;
  50
  51         if ( !windows_x || !windows_y )
  52                 return 0.0;
  53
  54         // for each window
  55         for ( int y = 0; y < windows_y; ++y )
  56                 for ( int x = 0; x < windows_x; ++x )
  57                 {
  58                         int     base_offset = x * window_size + y * window_size * width;
  59                         double  ref_acc = 0.0,
  60                                         ref_acc_2 = 0.0,
  61                                         cmp_acc = 0.0,
  62                                         cmp_acc_2 = 0.0,
  63                                         ref_cmp_acc = 0.0;
  64
  65                         // accumulate the pixel values for this window
  66                         for ( int j = 0; j < window_size; ++j )
  67                                 for ( int i = 0; i < window_size; ++i )
  68                                 {
  69                                         uint8_t c_a = a[bpp * (base_offset + j * width + i)];
  70                                         uint8_t c_b = b[bpp * (base_offset + j * width + i)];
  71                                         ref_acc += c_a;
  72                                         ref_acc_2 += c_a * c_a;
  73                                         cmp_acc += c_b;
  74                                         cmp_acc_2 += c_b * c_b;
  75                                         ref_cmp_acc += c_a * c_b;
  76                                 }
  77
  78                         // compute the SSIM for this window
  79                         // http://en.wikipedia.org/wiki/SSIM
  80                         // http://en.wikipedia.org/wiki/Variance
  81                         // http://en.wikipedia.org/wiki/Covariance
  82                         double n_samples = window_size * window_size,
  83                                         ref_avg = ref_acc / n_samples,
  84                                         ref_var = ref_acc_2 / n_samples - ref_avg * ref_avg,
  85                                         cmp_avg = cmp_acc / n_samples,
  86                                         cmp_var = cmp_acc_2 / n_samples - cmp_avg * cmp_avg,
  87                                         ref_cmp_cov = ref_cmp_acc / n_samples - ref_avg * cmp_avg,
  88                                         c1 = 6.5025, // (0.01*255.0)^2
  89                                         c2 = 58.5225, // (0.03*255)^2
  90                                         ssim_num = (2.0 * ref_avg * cmp_avg + c1) * (2.0 * ref_cmp_cov + c2),
  91                                         ssim_den = (ref_avg * ref_avg + cmp_avg * cmp_avg + c1) * (ref_var + cmp_var + c2);
  92
  93                         // accumulate the SSIM
  94                         avg += ssim_num / ssim_den;
  95                 }
  96
  97         // return the average SSIM
  98         return avg / windows_x / windows_y;
  99 }
 100
 101 static int get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 102 {
 103         mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
 104         mlt_properties properties = MLT_FRAME_PROPERTIES( a_frame );
 105         mlt_transition transition = MLT_TRANSITION( mlt_frame_pop_service( a_frame ) );
 106         uint8_t *b_image;
 107         int window_size = mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( transition ), "window_size" );
 108         double psnr[3], ssim[3];
 109
 110         *format = mlt_image_yuv422;
 111         mlt_frame_get_image( b_frame, &b_image, format, width, height, writable );
 112         mlt_frame_get_image( a_frame, image, format, width, height, writable );
 113
 114         psnr[0] = calc_psnr( *image, b_image, *width * *height, 2 );
 115         psnr[1] = calc_psnr( *image + 1, b_image + 1, *width * *height / 2, 4 );
 116         psnr[2] = calc_psnr( *image + 3, b_image + 3, *width * *height / 2, 4 );
 117         ssim[0] = calc_ssim( *image, b_image, *width, *height, window_size, 2 );
 118         ssim[1] = calc_ssim( *image + 1, b_image + 1, *width / 2, *height, window_size, 4 );
 119         ssim[2] = calc_ssim( *image + 3, b_image + 3, *width / 2, *height, window_size, 4 );
 120         mlt_properties_set_double( properties, "meta.vqm.psnr.y", psnr[0] );
 121         mlt_properties_set_double( properties, "meta.vqm.psnr.cb", psnr[1] );
 122         mlt_properties_set_double( properties, "meta.vqm.psnr.cr", psnr[2] );
 123         mlt_properties_set_double( properties, "meta.vqm.ssim.y", ssim[0] );
 124         mlt_properties_set_double( properties, "meta.vqm.ssim.cb", ssim[1] );
 125         mlt_properties_set_double( properties, "meta.vqm.ssim.cr", ssim[2] );
 126         printf( "%05d %05.2f %05.2f %05.2f %5.3f %5.3f %5.3f\n",
 127                         mlt_frame_get_position( a_frame ), psnr[0], psnr[1], psnr[2],
 128                         ssim[0], ssim[1], ssim[2] );
 129
 130         // copy the B frame to the bottom of the A frame for comparison
 131         window_size = mlt_image_format_size( *format, *width, *height, NULL ) / 2;
 132         memcpy( *image + window_size, b_image + window_size, window_size );
 133
 134         if ( !mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( transition ), "render" ) )
 135                 return 0;
 136
 137         // get RGBA image for Qt drawing
 138         *format = mlt_image_rgb24a;
 139         mlt_frame_get_image( a_frame, image, format, width, height, 1 );
 140
 141         // convert mlt image to qimage
 142         QImage img( *width, *height, QImage::Format_ARGB32 );
 143         int y = *height + 1;
 144         uint8_t *src = *image;
 145         while ( --y )
 146         {
 147                 QRgb *dst = (QRgb*) img.scanLine( *height - y );
 148                 int x = *width + 1;
 149                 while ( --x )
 150                 {
 151                         *dst++ = qRgba( src[0], src[1], src[2], 255 );
 152                         src += 4;
 153                 }
 154         }
 155
 156         // create QApplication, if needed
 157         if ( !app )
 158         {
 159                 if ( qApp )
 160                 {
 161                         app = qApp;
 162                 }
 163                 else
 164                 {
 165                         int argc = 1;
 166                         char* argv[] = { strdup( "unknown" ) };
 167
 168                         app = new QApplication( argc, argv );
 169                         const char *localename = mlt_properties_get_lcnumeric( MLT_TRANSITION_PROPERTIES(transition) );
 170                         QLocale::setDefault( QLocale( localename ) );
 171                         free( argv[0] );
 172                 }
 173         }
 174
 175         // setup Qt drawing
 176         QPainter painter;
 177         painter.begin( &img );
 178         painter.setRenderHints( QPainter::Antialiasing | QPainter::TextAntialiasing | QPainter::HighQualityAntialiasing );
 179
 180         // draw some stuff with Qt
 181         QPalette palette;
 182         QFont font;
 183         QString s;
 184         font.setBold( true );
 185         font.setPointSize( 30 * *height / 1080 );
 186         painter.setPen( QColor("black") );
 187         painter.drawLine( 0, *height/2 + 1, *width, *height/2 );
 188         painter.setPen( QColor("white") );
 189         painter.drawLine( 0, *height/2 - 1, *width, *height/2 );
 190         painter.setFont( font );
 191         s.sprintf( "Frame: %05d\nPSNR:   %05.2f (Y) %05.2f (Cb) %05.2f (Cr)\nSSIM:    %5.3f (Y) %5.3f (Cb) %5.3f (Cr)",
 192                           mlt_frame_get_position( a_frame ), psnr[0], psnr[1], psnr[2],
 193                           ssim[0], ssim[1], ssim[2] );
 194         painter.setPen( QColor("black") );
 195         painter.drawText( 52, *height * 8 / 10 + 2, *width, *height, 0, s );
 196         painter.setPen( QColor("white") );
 197         painter.drawText( 50, *height * 8 / 10, *width, *height, 0, s );
 198
 199         // finish Qt drawing
 200         painter.end();
 201         window_size = mlt_image_format_size( *format, *width, *height, NULL );
 202         uint8_t *dst = (uint8_t *) mlt_pool_alloc( window_size );
 203         mlt_properties_set_data( MLT_FRAME_PROPERTIES(a_frame), "image", dst, window_size, mlt_pool_release, NULL );
 204         *image = dst;
 205
 206         // convert qimage to mlt
 207         y = *height + 1;
 208         while ( --y )
 209         {
 210                 QRgb *src = (QRgb*) img.scanLine( *height - y );
 211                 int x = *width + 1;
 212                 while ( --x )
 213                 {
 214                         *dst++ = qRed( *src );
 215                         *dst++ = qGreen( *src );
 216                         *dst++ = qBlue( *src );
 217                         *dst++ = qAlpha( *src );
 218                         src++;
 219                 }
 220         }
 221
 222         return 0;
 223 }
 224
 225 static mlt_frame process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
 226 {
 227         mlt_frame_push_service( a_frame, transition );
 228         mlt_frame_push_frame( a_frame, b_frame );
 229         mlt_frame_push_get_image( a_frame, get_image );
 230
 231         return a_frame;
 232 }
 233
 234 extern "C" {
 235
 236 mlt_transition transition_vqm_init( mlt_profile profile, mlt_service_type type, const char *id, void *arg )
 237 {
 238         mlt_transition transition = mlt_transition_new();
 239
 240         if ( transition )
 241         {
 242                 mlt_properties properties = MLT_TRANSITION_PROPERTIES( transition );
 243
 244                 transition->process = process;
 245                 mlt_properties_set_int( properties, "_transition_type", 1 ); // video only
 246                 mlt_properties_set_int( properties, "window_size", 8 );
 247                 printf( "frame psnr[Y] psnr[Cb] psnr[Cr] ssim[Y] ssim[Cb] ssim[Cr]\n" );
 248         }
 249
 250         return transition;
 251 }
 252
 253 } // extern "C"