git.sesse.net Git - mlt/blob - src/modules/core/producer_colour.c

   1 /*
   2  * producer_colour.c -- raster image loader based upon gdk-pixbuf
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   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_producer.h>
  22 #include <framework/mlt_frame.h>
  23 #include <framework/mlt_pool.h>
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29
  30 typedef struct
  31 {
  32         uint8_t r, g, b, a;
  33 } rgba_color;
  34
  35 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  36 static void producer_close( mlt_producer parent );
  37
  38 mlt_producer producer_colour_init( mlt_profile profile, mlt_service_type type, const char *id, char *colour )
  39 {
  40         mlt_producer producer = calloc( 1, sizeof( struct mlt_producer_s ) );
  41         if ( producer != NULL && mlt_producer_init( producer, NULL ) == 0 )
  42         {
  43                 // Get the properties interface
  44                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
  45
  46                 // Callback registration
  47                 producer->get_frame = producer_get_frame;
  48                 producer->close = ( mlt_destructor )producer_close;
  49
  50                 // Set the default properties
  51                 mlt_properties_set( properties, "resource", colour == NULL ? "0x000000ff" : colour );
  52                 mlt_properties_set( properties, "_resource", "" );
  53                 mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile ) );
  54
  55                 return producer;
  56         }
  57         free( producer );
  58         return NULL;
  59 }
  60
  61 rgba_color parse_color( char *color, unsigned int color_int )
  62 {
  63         rgba_color result = { 0xff, 0xff, 0xff, 0xff };
  64
  65         if ( !strcmp( color, "red" ) )
  66         {
  67                 result.r = 0xff;
  68                 result.g = 0x00;
  69                 result.b = 0x00;
  70         }
  71         else if ( !strcmp( color, "green" ) )
  72         {
  73                 result.r = 0x00;
  74                 result.g = 0xff;
  75                 result.b = 0x00;
  76         }
  77         else if ( !strcmp( color, "blue" ) )
  78         {
  79                 result.r = 0x00;
  80                 result.g = 0x00;
  81                 result.b = 0xff;
  82         }
  83         else if ( strcmp( color, "white" ) )
  84         {
  85                 result.r = ( color_int >> 24 ) & 0xff;
  86                 result.g = ( color_int >> 16 ) & 0xff;
  87                 result.b = ( color_int >> 8 ) & 0xff;
  88                 result.a = ( color_int ) & 0xff;
  89         }
  90
  91         return result;
  92 }
  93
  94 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  95 {
  96         // Obtain properties of frame
  97         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  98
  99         // Obtain the producer for this frame
 100         mlt_producer producer = mlt_properties_get_data( properties, "producer_colour", NULL );
 101
 102         mlt_service_lock( MLT_PRODUCER_SERVICE( producer ) );
 103
 104         // Obtain properties of producer
 105         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 106
 107         // Get the current and previous colour strings
 108         char *now = mlt_properties_get( producer_props, "resource" );
 109         char *then = mlt_properties_get( producer_props, "_resource" );
 110
 111         // Get the current image and dimensions cached in the producer
 112         int size = 0;
 113         uint8_t *image = mlt_properties_get_data( producer_props, "image", &size );
 114         int current_width = mlt_properties_get_int( producer_props, "_width" );
 115         int current_height = mlt_properties_get_int( producer_props, "_height" );
 116         mlt_image_format current_format = mlt_properties_get_int( producer_props, "_format" );
 117
 118         // Parse the colour
 119         if ( now && strchr( now, '/' ) )
 120         {
 121                 now = strdup( strrchr( now, '/' ) + 1 );
 122                 mlt_properties_set( producer_props, "resource", now );
 123                 free( now );
 124                 now = mlt_properties_get( producer_props, "resource" );
 125         }
 126         rgba_color color = parse_color( now, mlt_properties_get_int( producer_props, "resource" ) );
 127
 128         // See if we need to regenerate
 129         if ( strcmp( now, then ) || *width != current_width || *height != current_height || *format != current_format )
 130         {
 131                 // Color the image
 132                 int i = *width * *height + 1;
 133                 int bpp;
 134
 135                 // Allocate the image
 136                 size = mlt_image_format_size( *format, *width, *height, &bpp );
 137                 uint8_t *p = image = mlt_pool_alloc( size );
 138
 139                 // Update the producer
 140                 mlt_properties_set_data( producer_props, "image", image, size, mlt_pool_release, NULL );
 141                 mlt_properties_set_int( producer_props, "_width", *width );
 142                 mlt_properties_set_int( producer_props, "_height", *height );
 143                 mlt_properties_set_int( producer_props, "_format", *format );
 144                 mlt_properties_set( producer_props, "_resource", now );
 145
 146                 mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
 147
 148                 switch ( *format )
 149                 {
 150                 case mlt_image_yuv422:
 151                 {
 152                         int uneven = *width % 2;
 153                         int count = ( *width - uneven ) / 2 + 1;
 154                         uint8_t y, u, v;
 155
 156                         RGB2YUV_601_SCALED( color.r, color.g, color.b, y, u, v );
 157                         i = *height + 1;
 158                         while ( --i )
 159                         {
 160                                 int j = count;
 161                                 while ( --j )
 162                                 {
 163                                         *p ++ = y;
 164                                         *p ++ = u;
 165                                         *p ++ = y;
 166                                         *p ++ = v;
 167                                 }
 168                                 if ( uneven )
 169                                 {
 170                                         *p ++ = y;
 171                                         *p ++ = u;
 172                                 }
 173                         }
 174                         break;
 175                 }
 176                 case mlt_image_rgb24:
 177                         while ( --i )
 178                         {
 179                                 *p ++ = color.r;
 180                                 *p ++ = color.g;
 181                                 *p ++ = color.b;
 182                         }
 183                         break;
 184                 case mlt_image_rgb24a:
 185                 case mlt_image_opengl:
 186                         while ( --i )
 187                         {
 188                                 *p ++ = color.r;
 189                                 *p ++ = color.g;
 190                                 *p ++ = color.b;
 191                                 *p ++ = color.a;
 192                         }
 193                         break;
 194                 default:
 195                         break;
 196                 }
 197         }
 198         else
 199         {
 200                 mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
 201         }
 202
 203         // Create the alpha channel
 204         int alpha_size = *width * *height;
 205         uint8_t *alpha = mlt_pool_alloc( alpha_size );
 206
 207         // Initialise the alpha
 208         if ( alpha )
 209                 memset( alpha, color.a, alpha_size );
 210
 211         // Clone our image
 212         *buffer = mlt_pool_alloc( size );
 213         memcpy( *buffer, image, size );
 214
 215         // Now update properties so we free the copy after
 216         mlt_frame_set_image( frame, *buffer, size, mlt_pool_release );
 217         mlt_frame_set_alpha( frame, alpha, alpha_size, mlt_pool_release );
 218         mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_props, "aspect_ratio" ) );
 219         mlt_properties_set_int( properties, "real_width", *width );
 220         mlt_properties_set_int( properties, "real_height", *height );
 221
 222
 223         return 0;
 224 }
 225
 226 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 227 {
 228         // Generate a frame
 229         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 230
 231         if ( *frame != NULL )
 232         {
 233                 // Obtain properties of frame and producer
 234                 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 235
 236                 // Obtain properties of producer
 237                 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 238
 239                 // Set the producer on the frame properties
 240                 mlt_properties_set_data( properties, "producer_colour", producer, 0, NULL, NULL );
 241
 242                 // Update timecode on the frame we're creating
 243                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 244
 245                 // Set producer-specific frame properties
 246                 mlt_properties_set_int( properties, "progressive", 1 );
 247                 mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_props, "aspect_ratio" ) );
 248
 249                 // colour is an alias for resource
 250                 if ( mlt_properties_get( producer_props, "colour" ) != NULL )
 251                         mlt_properties_set( producer_props, "resource", mlt_properties_get( producer_props, "colour" ) );
 252
 253                 // Push the get_image method
 254                 mlt_frame_push_get_image( *frame, producer_get_image );
 255         }
 256
 257         // Calculate the next timecode
 258         mlt_producer_prepare_next( producer );
 259
 260         return 0;
 261 }
 262
 263 static void producer_close( mlt_producer producer )
 264 {
 265         producer->close = NULL;
 266         mlt_producer_close( producer );
 267         free( producer );
 268 }