research.m1stereo.tv/gitweb/ - melted/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 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 "producer_colour.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( 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
  54                 return producer;
  55         }
  56         free( producer );
  57         return NULL;
  58 }
  59
  60 rgba_color parse_color( char *color )
  61 {
  62         rgba_color result = { 0xff, 0xff, 0xff, 0xff };
  63
  64         if ( strchr( color, '/' ) )
  65                 color = strrchr( color, '/' ) + 1;
  66
  67         if ( !strncmp( color, "0x", 2 ) )
  68         {
  69                 unsigned int temp = 0;
  70                 sscanf( color + 2, "%x", &temp );
  71                 result.r = ( temp >> 24 ) & 0xff;
  72                 result.g = ( temp >> 16 ) & 0xff;
  73                 result.b = ( temp >> 8 ) & 0xff;
  74                 result.a = ( temp ) & 0xff;
  75         }
  76         else if ( !strcmp( color, "red" ) )
  77         {
  78                 result.r = 0xff;
  79                 result.g = 0x00;
  80                 result.b = 0x00;
  81         }
  82         else if ( !strcmp( color, "green" ) )
  83         {
  84                 result.r = 0x00;
  85                 result.g = 0xff;
  86                 result.b = 0x00;
  87         }
  88         else if ( !strcmp( color, "blue" ) )
  89         {
  90                 result.r = 0x00;
  91                 result.g = 0x00;
  92                 result.b = 0xff;
  93         }
  94         else if ( strcmp( color, "white" ) )
  95         {
  96                 unsigned int temp = 0;
  97                 sscanf( color, "%d", &temp );
  98                 result.r = ( temp >> 24 ) & 0xff;
  99                 result.g = ( temp >> 16 ) & 0xff;
 100                 result.b = ( temp >> 8 ) & 0xff;
 101                 result.a = ( temp ) & 0xff;
 102         }
 103
 104         return result;
 105 }
 106
 107 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 108 {
 109         // May need to know the size of the image to clone it
 110         int size = 0;
 111
 112         // Obtain properties of frame
 113         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 114
 115         // Obtain the producer for this frame
 116         mlt_producer producer = mlt_properties_get_data( properties, "producer_colour", NULL );
 117
 118         // Obtain properties of producer
 119         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 120
 121         // Get the current and previous colour strings
 122         char *now = mlt_properties_get( producer_props, "resource" );
 123         char *then = mlt_properties_get( producer_props, "_resource" );
 124
 125         // Get the current image and dimensions cached in the producer
 126         uint8_t *image = mlt_properties_get_data( producer_props, "image", &size );
 127         int current_width = mlt_properties_get_int( producer_props, "_width" );
 128         int current_height = mlt_properties_get_int( producer_props, "_height" );
 129
 130         // Parse the colour
 131         rgba_color color = parse_color( now );
 132
 133         // See if we need to regenerate
 134         if ( strcmp( now, then ) || *width != current_width || *height != current_height )
 135         {
 136                 // Color the image
 137                 uint8_t y, u, v;
 138                 int i = 0;
 139
 140                 // Allocate the image
 141                 size = *width * *height * 2;
 142                 image = mlt_pool_alloc( size );
 143
 144                 // Update the producer
 145                 mlt_properties_set_data( producer_props, "image", image, size, mlt_pool_release, NULL );
 146                 mlt_properties_set_int( producer_props, "_width", *width );
 147                 mlt_properties_set_int( producer_props, "_height", *height );
 148                 mlt_properties_set( producer_props, "_resource", now );
 149
 150                 RGB2YUV( color.r, color.g, color.b, y, u, v );
 151
 152                 while ( i < size )
 153                 {
 154                         image[ i ++ ] = y;
 155                         image[ i ++ ] = u;
 156                         image[ i ++ ] = y;
 157                         image[ i ++ ] = v;
 158                 }
 159         }
 160
 161         // Update the frame
 162         mlt_properties_set_int( properties, "width", *width );
 163         mlt_properties_set_int( properties, "height", *height );
 164
 165         // Clone if necessary (deemed always necessary)
 166         if ( 1 )
 167         {
 168                 // Create the alpha channel
 169                 uint8_t *alpha = mlt_pool_alloc( size >> 1 );
 170
 171                 // Clone our image
 172                 uint8_t *copy = mlt_pool_alloc( size );
 173                 memcpy( copy, image, size );
 174
 175                 // We're going to pass the copy on
 176                 image = copy;
 177
 178                 // Initialise the alpha
 179                 if ( alpha )
 180                         memset( alpha, color.a, size >> 1 );
 181
 182                 // Now update properties so we free the copy after
 183                 mlt_properties_set_data( properties, "image", copy, size, mlt_pool_release, NULL );
 184                 mlt_properties_set_data( properties, "alpha", alpha, size >> 1, mlt_pool_release, NULL );
 185         }
 186
 187         // Pass on the image
 188         *buffer = image;
 189         *format = mlt_image_yuv422;
 190
 191         return 0;
 192 }
 193
 194 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 195 {
 196         // Generate a frame
 197         *frame = mlt_frame_init( );
 198
 199         if ( *frame != NULL )
 200         {
 201                 // Obtain properties of frame and producer
 202                 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 203
 204                 // Obtain properties of producer
 205                 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 206
 207                 // Set the producer on the frame properties
 208                 mlt_properties_set_data( properties, "producer_colour", producer, 0, NULL, NULL );
 209
 210                 // Update timecode on the frame we're creating
 211                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 212
 213                 // Set producer-specific frame properties
 214                 mlt_properties_set_int( properties, "progressive", 1 );
 215                 mlt_properties_set_double( properties, "aspect_ratio", 0 );
 216
 217                 // colour is an alias for resource
 218                 if ( mlt_properties_get( producer_props, "colour" ) != NULL )
 219                         mlt_properties_set( producer_props, "resource", mlt_properties_get( producer_props, "colour" ) );
 220
 221                 // Push the get_image method
 222                 mlt_frame_push_get_image( *frame, producer_get_image );
 223         }
 224
 225         // Calculate the next timecode
 226         mlt_producer_prepare_next( producer );
 227
 228         return 0;
 229 }
 230
 231 static void producer_close( mlt_producer producer )
 232 {
 233         producer->close = NULL;
 234         mlt_producer_close( producer );
 235         free( producer );
 236 }