research.m1stereo.tv/gitweb/ - melted/blob - src/modules/avformat/filter_avcolour_space.c

   1 /*
   2  * filter_avcolour_space.c -- Colour space filter
   3  * Copyright (C) 2004-2005 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "filter_avcolour_space.h"
  22
  23 #include <framework/mlt_frame.h>
  24
  25 // ffmpeg Header files
  26 #include <avformat.h>
  27 #ifdef SWSCALE
  28 #include <swscale.h>
  29 #endif
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33
  34 static inline int is_big_endian( )
  35 {
  36         union { int i; char c[ 4 ]; } big_endian_test;
  37         big_endian_test.i = 1;
  38
  39         return big_endian_test.c[ 0 ] != 1;
  40 }
  41
  42 static inline int convert_mlt_to_av_cs( mlt_image_format format )
  43 {
  44         int value = 0;
  45
  46         switch( format )
  47         {
  48                 case mlt_image_rgb24:
  49                         value = PIX_FMT_RGB24;
  50                         break;
  51                 case mlt_image_rgb24a:
  52                         value = PIX_FMT_RGBA32;
  53                         break;
  54                 case mlt_image_yuv422:
  55                         value = PIX_FMT_YUV422;
  56                         break;
  57                 case mlt_image_yuv420p:
  58                         value = PIX_FMT_YUV420P;
  59                         break;
  60                 case mlt_image_opengl:
  61                 case mlt_image_none:
  62                         fprintf( stderr, "Invalid format...\n" );
  63                         break;
  64         }
  65
  66         return value;
  67 }
  68
  69 static inline void convert_image( uint8_t *out, uint8_t *in, int out_fmt, int in_fmt, int width, int height )
  70 {
  71         AVPicture input;
  72         AVPicture output;
  73         avpicture_fill( &input, in, in_fmt, width, height );
  74         avpicture_fill( &output, out, out_fmt, width, height );
  75 #ifdef SWSCALE
  76         struct SwsContext *context = sws_getContext( width, height, in_fmt,
  77                 width, height, out_fmt, SWS_FAST_BILINEAR, NULL, NULL, NULL);
  78         sws_scale( context, input.data, input.linesize, 0, height,
  79                 output.data, output.linesize);
  80         sws_freeContext( context );
  81 #else
  82         img_convert( &output, out_fmt, &input, in_fmt, width, height );
  83 #endif
  84 }
  85
  86 /** Do it :-).
  87 */
  88
  89 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  90 {
  91         mlt_filter filter = mlt_frame_pop_service( this );
  92         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
  93         int output_format = *format;
  94         mlt_image_format forced = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "forced" );
  95         int error = 0;
  96
  97         // Allow this filter to force processing in a colour space other than requested
  98         *format = forced != 0 ? forced : *format;
  99
 100         error = mlt_frame_get_image( this, image, format, width, height, 0 );
 101
 102         if ( error == 0 && *format != output_format && *image != NULL && output_format != mlt_image_opengl )
 103         {
 104                 int in_fmt = convert_mlt_to_av_cs( *format );
 105                 int out_fmt = convert_mlt_to_av_cs( output_format );
 106                 int size = avpicture_get_size( out_fmt, *width, *height );
 107                 uint8_t *output = mlt_pool_alloc( size );
 108                 convert_image( output, *image, out_fmt, in_fmt, *width, *height );
 109
 110                 // Special case for alpha rgb input
 111                 if ( *format == mlt_image_rgb24a )
 112                 {
 113                         register uint8_t *alpha = mlt_frame_get_alpha_mask( this );
 114                         register int len = *width * *height;
 115                         register uint8_t *bits = *image;
 116                         register int n = ( len + 7 ) / 8;
 117
 118                         if( !is_big_endian( ) )
 119                                 bits += 3;
 120
 121                         // Extract alpha mask from the image using Duff's Device
 122                         switch( len % 8 )
 123                         {
 124                                 case 0: do { *alpha ++ = *bits; bits += 4;
 125                                 case 7:          *alpha ++ = *bits; bits += 4;
 126                                 case 6:          *alpha ++ = *bits; bits += 4;
 127                                 case 5:          *alpha ++ = *bits; bits += 4;
 128                                 case 4:          *alpha ++ = *bits; bits += 4;
 129                                 case 3:          *alpha ++ = *bits; bits += 4;
 130                                 case 2:          *alpha ++ = *bits; bits += 4;
 131                                 case 1:          *alpha ++ = *bits; bits += 4;
 132                                                 }
 133                                                 while( --n );
 134                         }
 135                 }
 136
 137                 // Update the output
 138                 *image = output;
 139                 *format = output_format;
 140                 mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
 141                 mlt_properties_set_int( properties, "format", output_format );
 142
 143                 // Special case for alpha rgb output
 144                 if ( *format == mlt_image_rgb24a )
 145                 {
 146                         // Fetch the alpha
 147                         register uint8_t *alpha = mlt_frame_get_alpha_mask( this );
 148
 149                         if ( alpha != NULL )
 150                         {
 151                                 register uint8_t *bits = *image;
 152                                 register int len = *width * *height;
 153                                 register int n = ( len + 7 ) / 8;
 154
 155                                 if( !is_big_endian( ) )
 156                                         bits += 3;
 157
 158                                 // Merge the alpha mask into the RGB image using Duff's Device
 159                                 switch( len % 8 )
 160                                 {
 161                                         case 0: do { *bits = *alpha++; bits += 4;
 162                                         case 7:          *bits = *alpha++; bits += 4;
 163                                         case 6:          *bits = *alpha++; bits += 4;
 164                                         case 5:          *bits = *alpha++; bits += 4;
 165                                         case 4:          *bits = *alpha++; bits += 4;
 166                                         case 3:          *bits = *alpha++; bits += 4;
 167                                         case 2:          *bits = *alpha++; bits += 4;
 168                                         case 1:          *bits = *alpha++; bits += 4;
 169                                                         }
 170                                                         while( --n );
 171                                 }
 172                         }
 173                 }
 174         }
 175         else if ( error == 0 && *format != output_format && *image != NULL && output_format == mlt_image_opengl )
 176         {
 177                 if ( *format == mlt_image_yuv422 )
 178                 {
 179                         int size = *width * *height * 4;
 180                         uint8_t *output = mlt_pool_alloc( size );
 181                         int h = *height;
 182                         int w = *width;
 183                         uint8_t *o = output + size;
 184                         int ostride = w * 4;
 185                         uint8_t *p = *image;
 186                         uint8_t *alpha = mlt_frame_get_alpha_mask( this ) + *width * *height;
 187                         int r, g, b;
 188
 189                         while( h -- )
 190                         {
 191                                 w = *width;
 192                                 o -= ostride;
 193                                 alpha -= *width;
 194                                 while( w >= 2 )
 195                                 {
 196                                         YUV2RGB( *p, *( p + 1 ), *( p + 3 ), r, g, b );
 197                                         *o ++ = r;
 198                                         *o ++ = g;
 199                                         *o ++ = b;
 200                                         *o ++ = *alpha ++;
 201                                         YUV2RGB( *( p + 2 ), *( p + 1 ), *( p + 3 ), r, g, b );
 202                                         *o ++ = r;
 203                                         *o ++ = g;
 204                                         *o ++ = b;
 205                                         *o ++ = *alpha ++;
 206                                         w -= 2;
 207                                         p += 4;
 208                                 }
 209                                 o -= ostride;
 210                                 alpha -= *width;
 211                         }
 212
 213                         mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
 214                         mlt_properties_set_int( properties, "format", output_format );
 215                         *image = output;
 216                         *format = output_format;
 217                 }
 218         }
 219
 220         return error;
 221 }
 222
 223 /** Filter processing.
 224 */
 225
 226 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 227 {
 228         mlt_frame_push_service( frame, this );
 229         mlt_frame_push_get_image( frame, filter_get_image );
 230         return frame;
 231 }
 232
 233 /** Constructor for the filter.
 234 */
 235
 236 mlt_filter filter_avcolour_space_init( void *arg )
 237 {
 238         mlt_filter this = mlt_filter_new( );
 239         if ( this != NULL )
 240                 this->process = filter_process;
 241         return this;
 242 }
 243