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 library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <framework/mlt_filter.h>
  22 #include <framework/mlt_frame.h>
  23
  24 // ffmpeg Header files
  25 #include <avformat.h>
  26 #ifdef SWSCALE
  27 #include <swscale.h>
  28 #endif
  29
  30 #if LIBAVUTIL_VERSION_INT < (50<<16)
  31 #define PIX_FMT_RGB32 PIX_FMT_RGBA32
  32 #define PIX_FMT_YUYV422 PIX_FMT_YUV422
  33 #endif
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37
  38 static inline int is_big_endian( )
  39 {
  40         union { int i; char c[ 4 ]; } big_endian_test;
  41         big_endian_test.i = 1;
  42
  43         return big_endian_test.c[ 0 ] != 1;
  44 }
  45
  46 static inline int convert_mlt_to_av_cs( mlt_image_format format )
  47 {
  48         int value = 0;
  49
  50         switch( format )
  51         {
  52                 case mlt_image_rgb24:
  53                         value = PIX_FMT_RGB24;
  54                         break;
  55                 case mlt_image_rgb24a:
  56                         value = PIX_FMT_RGB32;
  57                         break;
  58                 case mlt_image_yuv422:
  59                         value = PIX_FMT_YUYV422;
  60                         break;
  61                 case mlt_image_yuv420p:
  62                         value = PIX_FMT_YUV420P;
  63                         break;
  64                 case mlt_image_opengl:
  65                 case mlt_image_none:
  66                         fprintf( stderr, "Invalid format...\n" );
  67                         break;
  68         }
  69
  70         return value;
  71 }
  72
  73 static inline void convert_image( uint8_t *out, uint8_t *in, int out_fmt, int in_fmt, int width, int height )
  74 {
  75         AVPicture input;
  76         AVPicture output;
  77         avpicture_fill( &input, in, in_fmt, width, height );
  78         avpicture_fill( &output, out, out_fmt, width, height );
  79 #ifdef SWSCALE
  80         struct SwsContext *context = sws_getContext( width, height, in_fmt,
  81                 width, height, out_fmt, SWS_FAST_BILINEAR, NULL, NULL, NULL);
  82         sws_scale( context, input.data, input.linesize, 0, height,
  83                 output.data, output.linesize);
  84         sws_freeContext( context );
  85 #else
  86         img_convert( &output, out_fmt, &input, in_fmt, width, height );
  87 #endif
  88 }
  89
  90 /** Do it :-).
  91 */
  92
  93 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  94 {
  95         mlt_filter filter = mlt_frame_pop_service( this );
  96         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
  97         int output_format = *format;
  98         mlt_image_format forced = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "forced" );
  99         int error = 0;
 100
 101         // Allow this filter to force processing in a colour space other than requested
 102         *format = forced != 0 ? forced : *format;
 103
 104         error = mlt_frame_get_image( this, image, format, width, height, 0 );
 105
 106         if ( error == 0 && *format != output_format && *image != NULL && output_format != mlt_image_opengl )
 107         {
 108                 int in_fmt = convert_mlt_to_av_cs( *format );
 109                 int out_fmt = convert_mlt_to_av_cs( output_format );
 110                 int size = avpicture_get_size( out_fmt, *width, *height );
 111                 uint8_t *output = mlt_pool_alloc( size );
 112                 convert_image( output, *image, out_fmt, in_fmt, *width, *height );
 113
 114                 // Special case for alpha rgb input
 115                 if ( *format == mlt_image_rgb24a )
 116                 {
 117                         register uint8_t *alpha = mlt_frame_get_alpha_mask( this );
 118                         register int len = *width * *height;
 119                         register uint8_t *bits = *image;
 120                         register int n = ( len + 7 ) / 8;
 121
 122                         if( !is_big_endian( ) )
 123                                 bits += 3;
 124
 125                         // Extract alpha mask from the image using Duff's Device
 126                         switch( len % 8 )
 127                         {
 128                                 case 0: do { *alpha ++ = *bits; bits += 4;
 129                                 case 7:          *alpha ++ = *bits; bits += 4;
 130                                 case 6:          *alpha ++ = *bits; bits += 4;
 131                                 case 5:          *alpha ++ = *bits; bits += 4;
 132                                 case 4:          *alpha ++ = *bits; bits += 4;
 133                                 case 3:          *alpha ++ = *bits; bits += 4;
 134                                 case 2:          *alpha ++ = *bits; bits += 4;
 135                                 case 1:          *alpha ++ = *bits; bits += 4;
 136                                                 }
 137                                                 while( --n );
 138                         }
 139                 }
 140
 141                 // Update the output
 142                 *image = output;
 143                 *format = output_format;
 144                 mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
 145                 mlt_properties_set_int( properties, "format", output_format );
 146
 147                 // Special case for alpha rgb output
 148                 if ( *format == mlt_image_rgb24a )
 149                 {
 150                         // Fetch the alpha
 151                         register uint8_t *alpha = mlt_frame_get_alpha_mask( this );
 152
 153                         if ( alpha != NULL )
 154                         {
 155                                 register uint8_t *bits = *image;
 156                                 register int len = *width * *height;
 157                                 register int n = ( len + 7 ) / 8;
 158
 159                                 if( !is_big_endian( ) )
 160                                         bits += 3;
 161
 162                                 // Merge the alpha mask into the RGB image using Duff's Device
 163                                 switch( len % 8 )
 164                                 {
 165                                         case 0: do { *bits = *alpha++; bits += 4;
 166                                         case 7:          *bits = *alpha++; bits += 4;
 167                                         case 6:          *bits = *alpha++; bits += 4;
 168                                         case 5:          *bits = *alpha++; bits += 4;
 169                                         case 4:          *bits = *alpha++; bits += 4;
 170                                         case 3:          *bits = *alpha++; bits += 4;
 171                                         case 2:          *bits = *alpha++; bits += 4;
 172                                         case 1:          *bits = *alpha++; bits += 4;
 173                                                         }
 174                                                         while( --n );
 175                                 }
 176                         }
 177                 }
 178         }
 179         else if ( error == 0 && *format != output_format && *image != NULL && output_format == mlt_image_opengl )
 180         {
 181                 if ( *format == mlt_image_yuv422 )
 182                 {
 183                         int size = *width * *height * 4;
 184                         uint8_t *output = mlt_pool_alloc( size );
 185                         int h = *height;
 186                         int w = *width;
 187                         uint8_t *o = output + size;
 188                         int ostride = w * 4;
 189                         uint8_t *p = *image;
 190                         uint8_t *alpha = mlt_frame_get_alpha_mask( this ) + *width * *height;
 191                         int r, g, b;
 192
 193                         while( h -- )
 194                         {
 195                                 w = *width;
 196                                 o -= ostride;
 197                                 alpha -= *width;
 198                                 while( w >= 2 )
 199                                 {
 200                                         YUV2RGB( *p, *( p + 1 ), *( p + 3 ), r, g, b );
 201                                         *o ++ = r;
 202                                         *o ++ = g;
 203                                         *o ++ = b;
 204                                         *o ++ = *alpha ++;
 205                                         YUV2RGB( *( p + 2 ), *( p + 1 ), *( p + 3 ), r, g, b );
 206                                         *o ++ = r;
 207                                         *o ++ = g;
 208                                         *o ++ = b;
 209                                         *o ++ = *alpha ++;
 210                                         w -= 2;
 211                                         p += 4;
 212                                 }
 213                                 o -= ostride;
 214                                 alpha -= *width;
 215                         }
 216
 217                         mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
 218                         mlt_properties_set_int( properties, "format", output_format );
 219                         *image = output;
 220                         *format = output_format;
 221                 }
 222         }
 223
 224         return error;
 225 }
 226
 227 /** Filter processing.
 228 */
 229
 230 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 231 {
 232         mlt_frame_push_service( frame, this );
 233         mlt_frame_push_get_image( frame, filter_get_image );
 234         return frame;
 235 }
 236
 237 /** Constructor for the filter.
 238 */
 239
 240 mlt_filter filter_avcolour_space_init( void *arg )
 241 {
 242         mlt_filter this = mlt_filter_new( );
 243         if ( this != NULL )
 244                 this->process = filter_process;
 245         return this;
 246 }
 247