git.sesse.net Git - mlt/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
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30
  31 static inline int convert_mlt_to_av_cs( mlt_image_format format )
  32 {
  33         int value = 0;
  34
  35         switch( format )
  36         {
  37                 case mlt_image_rgb24:
  38                         value = PIX_FMT_RGB24;
  39                         break;
  40                 case mlt_image_rgb24a:
  41                         value = PIX_FMT_RGBA32;
  42                         break;
  43                 case mlt_image_yuv422:
  44                         value = PIX_FMT_YUV422;
  45                         break;
  46                 case mlt_image_yuv420p:
  47                         value = PIX_FMT_YUV420P;
  48                         break;
  49                 case mlt_image_opengl:
  50                 case mlt_image_none:
  51                         fprintf( stderr, "Invalid format...\n" );
  52                         break;
  53         }
  54
  55         return value;
  56 }
  57
  58 static inline void convert_image( uint8_t *out, uint8_t *in, int out_fmt, int in_fmt, int width, int height )
  59 {
  60         AVPicture input;
  61         AVPicture output;
  62         avpicture_fill( &output, out, out_fmt, width, height );
  63         avpicture_fill( &input, in, in_fmt, width, height );
  64         img_convert( &output, out_fmt, &input, in_fmt, width, height );
  65 }
  66
  67 /** Do it :-).
  68 */
  69
  70 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  71 {
  72         mlt_filter filter = mlt_frame_pop_service( this );
  73         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
  74         int output_format = *format;
  75         mlt_image_format forced = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "forced" );
  76         int error = 0;
  77
  78         // Allow this filter to force processing in a colour space other than requested
  79         *format = forced != 0 ? forced : *format;
  80
  81         error = mlt_frame_get_image( this, image, format, width, height, 0 );
  82
  83         if ( error == 0 && *format != output_format && *image != NULL && output_format != mlt_image_opengl )
  84         {
  85                 int in_fmt = convert_mlt_to_av_cs( *format );
  86                 int out_fmt = convert_mlt_to_av_cs( output_format );
  87                 int size = avpicture_get_size( out_fmt, *width, *height );
  88                 uint8_t *output = mlt_pool_alloc( size );
  89                 convert_image( output, *image, out_fmt, in_fmt, *width, *height );
  90                 *image = output;
  91                 *format = output_format;
  92                 mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
  93                 mlt_properties_set_int( properties, "format", output_format );
  94
  95                 // Special case for alpha rgb - merge the alpha mask when it exists
  96                 if ( *format == mlt_image_rgb24a )
  97                 {
  98                         // Fetch the alpha
  99                         register uint8_t *alpha = mlt_frame_get_alpha_mask( this );
 100
 101                         if ( alpha != NULL )
 102                         {
 103                                 register uint8_t *bits = *image;
 104                                 register int len = *width * *height;
 105                                 register int n = ( len + 7 ) / 8;
 106
 107                                 // TODO: Proper check for big endian systems
 108                                 #ifndef __DARWIN__
 109                                 bits += 3;
 110                                 #endif
 111
 112                                 // Merge the alpha mask into the RGB image using Duff's Device
 113                                 switch( len % 8 )
 114                                 {
 115                                         case 0: do { *bits = *alpha++; bits += 4;
 116                                         case 7:          *bits = *alpha++; bits += 4;
 117                                         case 6:          *bits = *alpha++; bits += 4;
 118                                         case 5:          *bits = *alpha++; bits += 4;
 119                                         case 4:          *bits = *alpha++; bits += 4;
 120                                         case 3:          *bits = *alpha++; bits += 4;
 121                                         case 2:          *bits = *alpha++; bits += 4;
 122                                         case 1:          *bits = *alpha++; bits += 4;
 123                                                         }
 124                                                         while( --n );
 125                                 }
 126                         }
 127                 }
 128         }
 129         else if ( error == 0 && *format != output_format && *image != NULL && output_format == mlt_image_opengl )
 130         {
 131                 if ( *format == mlt_image_yuv422 )
 132                 {
 133                         int size = *width * *height * 4;
 134                         uint8_t *output = mlt_pool_alloc( size );
 135                         int h = *height;
 136                         int w = *width;
 137                         uint8_t *o = output + size;
 138                         int ostride = w * 4;
 139                         uint8_t *p = *image;
 140                         uint8_t *alpha = mlt_frame_get_alpha_mask( this ) + *width * *height;
 141                         int r, g, b;
 142
 143                         while( h -- )
 144                         {
 145                                 w = *width;
 146                                 o -= ostride;
 147                                 alpha -= *width;
 148                                 while( w >= 2 )
 149                                 {
 150                                         YUV2RGB( *p, *( p + 1 ), *( p + 3 ), r, g, b );
 151                                         *o ++ = r;
 152                                         *o ++ = g;
 153                                         *o ++ = b;
 154                                         *o ++ = *alpha ++;
 155                                         YUV2RGB( *( p + 2 ), *( p + 1 ), *( p + 3 ), r, g, b );
 156                                         *o ++ = r;
 157                                         *o ++ = g;
 158                                         *o ++ = b;
 159                                         *o ++ = *alpha ++;
 160                                         w -= 2;
 161                                         p += 4;
 162                                 }
 163                                 o -= ostride;
 164                                 alpha -= *width;
 165                         }
 166
 167                         mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
 168                         mlt_properties_set_int( properties, "format", output_format );
 169                         *image = output;
 170                         *format = output_format;
 171                 }
 172         }
 173
 174         return error;
 175 }
 176
 177 /** Filter processing.
 178 */
 179
 180 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 181 {
 182         mlt_frame_push_service( frame, this );
 183         mlt_frame_push_get_image( frame, filter_get_image );
 184         return frame;
 185 }
 186
 187 /** Constructor for the filter.
 188 */
 189
 190 mlt_filter filter_avcolour_space_init( void *arg )
 191 {
 192         mlt_filter this = mlt_filter_new( );
 193         if ( this != NULL )
 194                 this->process = filter_process;
 195         return this;
 196 }
 197