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   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file trgt_yuv.cpp
   3 **      \brief Template File
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **      Copyright (c) 2007 Chris Moore
  10 **
  11 **      This package is free software; you can redistribute it and/or
  12 **      modify it under the terms of the GNU General Public License as
  13 **      published by the Free Software Foundation; either version 2 of
  14 **      the License, or (at your option) any later version.
  15 **
  16 **      This package is distributed in the hope that it will be useful,
  17 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19 **      General Public License for more details.
  20 **      \endlegal
  21 */
  22 /* ========================================================================= */
  23
  24 /* === H E A D E R S ======================================================= */
  25
  26 #define SYNFIG_TARGET
  27
  28 #ifdef USING_PCH
  29 #       include "pch.h"
  30 #else
  31 #ifdef HAVE_CONFIG_H
  32 #       include <config.h>
  33 #endif
  34
  35 #include "trgt_yuv.h"
  36 #include <ETL/stringf>
  37 #include <cstdio>
  38 #include <algorithm>
  39 #include <functional>
  40 #endif
  41
  42 using namespace synfig;
  43 using namespace std;
  44 using namespace etl;
  45
  46 /* === M A C R O S ========================================================= */
  47
  48 #define Y_FLOOR (16)
  49 #define Y_CEIL  (235)
  50 #define Y_RANGE (Y_CEIL-Y_FLOOR)
  51
  52 #define UV_FLOOR        (16)
  53 #define UV_CEIL         (240)
  54 #define UV_RANGE (UV_CEIL-UV_FLOOR)
  55
  56 /* === G L O B A L S ======================================================= */
  57
  58 SYNFIG_TARGET_INIT(yuv);
  59 SYNFIG_TARGET_SET_NAME(yuv,"yuv420p");
  60 SYNFIG_TARGET_SET_EXT(yuv,"yuv");
  61 SYNFIG_TARGET_SET_VERSION(yuv,"0.1");
  62 SYNFIG_TARGET_SET_CVS_ID(yuv,"$Id$");
  63
  64 /* === M E T H O D S ======================================================= */
  65
  66 yuv::yuv(const char *FILENAME):
  67         filename(FILENAME),
  68         file( (filename=="-")?stdout:fopen(filename.c_str(),POPEN_BINARY_WRITE_TYPE) ),
  69         dithering(true)
  70 {
  71         // YUV420P doesn't have an alpha channel
  72         set_remove_alpha();
  73 }
  74
  75 yuv::~yuv()
  76 {
  77 }
  78
  79 bool
  80 yuv::init()
  81 {
  82         if (!file)
  83                 return false;
  84
  85         fprintf(file.get(), "YUV4MPEG2 W%d H%d F%d:1 Ip\n",
  86                         desc.get_w(), desc.get_h(),
  87                         round_to_int(desc.get_frame_rate()));
  88         return true;
  89 }
  90
  91 bool
  92 yuv::set_rend_desc(RendDesc *given_desc)
  93 {
  94         given_desc->clear_flags();
  95
  96         // Make sure our width is divisible by two
  97         given_desc->set_w(given_desc->get_w()*2/2);
  98         given_desc->set_h(given_desc->get_h()*2/2);
  99
 100         desc=*given_desc;
 101
 102         // Set up our surface
 103         surface.set_wh(desc.get_w(),desc.get_h());
 104
 105         return true;
 106 }
 107
 108 bool
 109 yuv::start_frame(synfig::ProgressCallback */*callback*/)
 110 {
 111         fprintf(file.get(), "FRAME\n");
 112         return static_cast<bool>(file);
 113 }
 114
 115 Color *
 116 yuv::start_scanline(int x)
 117 {
 118         return surface[x];
 119 }
 120
 121 bool
 122 yuv::end_scanline()
 123 {
 124         return static_cast<bool>(file);
 125 }
 126
 127 void
 128 yuv::end_frame()
 129 {
 130         const int w=desc.get_w(),h=desc.get_h();
 131         int x,y;
 132
 133         assert(file);
 134
 135         // Output Y' channel, adjusting
 136         // the gamma as we go
 137         for(y=0;y<h;y++)
 138                 for(x=0;x<w;x++)
 139                 {
 140                         Color& c(surface[y][x]);
 141                         c=c.clamped();
 142                         c.set_r(gamma().r_F32_to_F32(c.get_r()));
 143                         c.set_g(gamma().g_F32_to_F32(c.get_g()));
 144                         c.set_b(gamma().b_F32_to_F32(c.get_b()));
 145                         float f(c.get_y());
 146                         int i(max(min(round_to_int(c.get_y()*Y_RANGE),Y_RANGE),0)+Y_FLOOR);
 147
 148                         if(dithering)
 149                         {
 150                                 const float er(f-((float)i-Y_FLOOR)/Y_RANGE);
 151                                 const Color error(er,er,er);
 152
 153                                 if(surface.get_h()>y+1)
 154                                 {
 155                                         surface[y+1][x-1]+=error * ((float)3/(float)16);
 156                                         surface[y+1][x]+=error * ((float)5/(float)16);
 157                                         if(surface.get_w()>x+1)
 158                                                 surface[y+1][x+1]+=error * ((float)1/(float)16);
 159                                 }
 160                                 if(surface.get_w()>x+1)
 161                                         surface[y][x+1]+=error * ((float)7/(float)16);
 162                         }
 163
 164                         fputc(i,file.get());
 165                 }
 166
 167
 168         // Create new super-sampled surface
 169         Surface sm_surface(w/2,h/2);
 170         for(y=0;y<h;y+=2)
 171                 for(x=0;x<w;x+=2)
 172                 {
 173                         Color c(Color::alpha());
 174                         c+=surface[y][x];
 175                         c+=surface[y+1][x];
 176                         c+=surface[y][x+1];
 177                         c+=surface[y+1][x+1];
 178                         c/=4;
 179                         sm_surface[y/2][x/2]=c;
 180                 }
 181
 182         // Output U channel
 183         for(y=0;y<sm_surface.get_h();y++)
 184                 for(x=0;x<sm_surface.get_w();x++)
 185                 {
 186                         const Color& c(sm_surface[y][x]);
 187                         const float f(c.get_u());
 188                         const int i(max(min(round_to_int((f+0.5f)*UV_RANGE),UV_RANGE),0)+UV_FLOOR);
 189
 190                         if(dithering)
 191                         {
 192                                 const float er(f-((((float)i-UV_FLOOR)/UV_RANGE)-0.5f));
 193                                 const Color error(Color::YUV(0,er,0));
 194
 195                                 if(sm_surface.get_h()>y+1)
 196                                 {
 197                                         sm_surface[y+1][x-1]+=error * ((float)3/(float)16);
 198                                         sm_surface[y+1][x]+=error * ((float)5/(float)16);
 199                                         if(sm_surface.get_w()>x+1)
 200                                                 sm_surface[y+1][x+1]+=error * ((float)1/(float)16);
 201                                 }
 202                                 if(sm_surface.get_w()>x+1)
 203                                         sm_surface[y][x+1]+=error * ((float)7/(float)16);
 204                         }
 205                         fputc(i,file.get());
 206                 }
 207
 208         // Output V channel
 209         for(y=0;y<sm_surface.get_h();y++)
 210                 for(x=0;x<sm_surface.get_w();x++)
 211                 {
 212                         const Color& c(sm_surface[y][x]);
 213                         const float f(c.get_v());
 214                         const int i(max(min(round_to_int((f+0.5f)*UV_RANGE),UV_RANGE),0)+UV_FLOOR);
 215
 216                         if(dithering)
 217                         {
 218                                 const float er(f-((((float)i-UV_FLOOR)/UV_RANGE)-0.5f));
 219                                 const Color error(Color::YUV(0,0,er));
 220
 221                                 if(sm_surface.get_h()>y+1)
 222                                 {
 223                                         sm_surface[y+1][x-1]+=error * ((float)3/(float)16);
 224                                         sm_surface[y+1][x]+=error * ((float)5/(float)16);
 225                                         if(sm_surface.get_w()>x+1)
 226                                                 sm_surface[y+1][x+1]+=error * ((float)1/(float)16);
 227                                 }
 228                                 if(sm_surface.get_w()>x+1)
 229                                         sm_surface[y][x+1]+=error * ((float)7/(float)16);
 230                         }
 231                         fputc(i,file.get());
 232                 }
 233
 234         // Flush out the frame
 235         fflush(file.get());
 236 }