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", 0 );
  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         // May need to know the size of the image to clone it
  97         int size = 0;
  98
  99         // Obtain properties of frame
 100         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 101
 102         // Obtain the producer for this frame
 103         mlt_producer producer = mlt_properties_get_data( properties, "producer_colour", NULL );
 104
 105         // Obtain properties of producer
 106         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 107
 108         // Get the current and previous colour strings
 109         char *now = mlt_properties_get( producer_props, "resource" );
 110         char *then = mlt_properties_get( producer_props, "_resource" );
 111
 112         // Get the current image and dimensions cached in the producer
 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
 117         // Parse the colour
 118         char *resource = mlt_properties_get( producer_props, "resource" );
 119         if ( resource && strchr( resource, '/' ) )
 120                 mlt_properties_set( producer_props, "resource", strrchr( resource, '/' ) + 1 );
 121         rgba_color color = parse_color( now, mlt_properties_get_int( producer_props, "resource" ) );
 122
 123         // See if we need to regenerate
 124         if ( strcmp( now, then ) || *width != current_width || *height != current_height )
 125         {
 126                 // Color the image
 127                 uint8_t y, u, v;
 128                 int i = *height;
 129                 int j = 0;
 130                 int uneven = *width % 2;
 131                 int count = ( *width - uneven ) / 2;
 132                 uint8_t *p = NULL;
 133
 134                 // Allocate the image
 135                 size = *width * *height * 2;
 136                 image = mlt_pool_alloc( size );
 137
 138                 // Update the producer
 139                 mlt_properties_set_data( producer_props, "image", image, size, mlt_pool_release, NULL );
 140                 mlt_properties_set_int( producer_props, "_width", *width );
 141                 mlt_properties_set_int( producer_props, "_height", *height );
 142                 mlt_properties_set( producer_props, "_resource", now );
 143
 144                 RGB2YUV( color.r, color.g, color.b, y, u, v );
 145
 146                 p = image;
 147
 148                 while ( i -- )
 149                 {
 150                         j = count;
 151                         while ( j -- )
 152                         {
 153                                 *p ++ = y;
 154                                 *p ++ = u;
 155                                 *p ++ = y;
 156                                 *p ++ = v;
 157                         }
 158                         if ( uneven )
 159                         {
 160                                 *p ++ = y;
 161                                 *p ++ = u;
 162                         }
 163                 }
 164         }
 165
 166         // Update the frame
 167         mlt_properties_set_int( properties, "width", *width );
 168         mlt_properties_set_int( properties, "height", *height );
 169
 170         // Clone if necessary (deemed always necessary)
 171         if ( 1 )
 172         {
 173                 // Create the alpha channel
 174                 uint8_t *alpha = mlt_pool_alloc( size >> 1 );
 175
 176                 // Clone our image
 177                 uint8_t *copy = mlt_pool_alloc( size );
 178                 memcpy( copy, image, size );
 179
 180                 // We're going to pass the copy on
 181                 image = copy;
 182
 183                 // Initialise the alpha
 184                 if ( alpha )
 185                         memset( alpha, color.a, size >> 1 );
 186
 187                 // Now update properties so we free the copy after
 188                 mlt_properties_set_data( properties, "image", copy, size, mlt_pool_release, NULL );
 189                 mlt_properties_set_data( properties, "alpha", alpha, size >> 1, mlt_pool_release, NULL );
 190                 mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_props, "aspect_ratio" ) );
 191         }
 192
 193         // Pass on the image
 194         *buffer = image;
 195         *format = mlt_image_yuv422;
 196
 197         return 0;
 198 }
 199
 200 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 201 {
 202         // Generate a frame
 203         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 204
 205         if ( *frame != NULL )
 206         {
 207                 // Obtain properties of frame and producer
 208                 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 209
 210                 // Obtain properties of producer
 211                 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 212
 213                 // Set the producer on the frame properties
 214                 mlt_properties_set_data( properties, "producer_colour", producer, 0, NULL, NULL );
 215
 216                 // Update timecode on the frame we're creating
 217                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 218
 219                 // Set producer-specific frame properties
 220                 mlt_properties_set_int( properties, "progressive", 1 );
 221                 mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_props, "aspect_ratio" ) );
 222
 223                 // colour is an alias for resource
 224                 if ( mlt_properties_get( producer_props, "colour" ) != NULL )
 225                         mlt_properties_set( producer_props, "resource", mlt_properties_get( producer_props, "colour" ) );
 226
 227                 // Push the get_image method
 228                 mlt_frame_push_get_image( *frame, producer_get_image );
 229         }
 230
 231         // Calculate the next timecode
 232         mlt_producer_prepare_next( producer );
 233
 234         return 0;
 235 }
 236
 237 static void producer_close( mlt_producer producer )
 238 {
 239         producer->close = NULL;
 240         mlt_producer_close( producer );
 241         free( producer );
 242 }