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 = producer_close;
  49
  50                 // Set the default properties
  51                 if ( colour == NULL )
  52                         colour = "0x000000ff";
  53                 mlt_properties_set( properties, "resource", colour );
  54
  55                 return producer;
  56         }
  57         free( producer );
  58         return NULL;
  59 }
  60
  61 rgba_color parse_color( char *color )
  62 {
  63         rgba_color result = { 0xff, 0xff, 0xff, 0xff };
  64
  65         if ( !strncmp( color, "0x", 2 ) )
  66         {
  67                 unsigned int temp = 0;
  68                 sscanf( color + 2, "%x", &temp );
  69                 result.r = ( temp >> 24 ) & 0xff;
  70                 result.g = ( temp >> 16 ) & 0xff;
  71                 result.b = ( temp >> 8 ) & 0xff;
  72                 result.a = ( temp ) & 0xff;
  73         }
  74         else if ( !strcmp( color, "red" ) )
  75         {
  76                 result.r = 0xff;
  77                 result.g = 0x00;
  78                 result.b = 0x00;
  79         }
  80         else if ( !strcmp( color, "green" ) )
  81         {
  82                 result.r = 0x00;
  83                 result.g = 0xff;
  84                 result.b = 0x00;
  85         }
  86         else if ( !strcmp( color, "blue" ) )
  87         {
  88                 result.r = 0x00;
  89                 result.g = 0x00;
  90                 result.b = 0xff;
  91         }
  92         else if ( strcmp( color, "white" ) )
  93         {
  94                 unsigned int temp = 0;
  95                 sscanf( color, "%d", &temp );
  96                 result.r = ( temp >> 24 ) & 0xff;
  97                 result.g = ( temp >> 16 ) & 0xff;
  98                 result.b = ( temp >> 8 ) & 0xff;
  99                 result.a = ( temp ) & 0xff;
 100         }
 101
 102         return result;
 103 }
 104
 105 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 106 {
 107         // May need to know the size of the image to clone it
 108         int size = 0;
 109
 110         // Obtain properties of frame
 111         mlt_properties properties = mlt_frame_properties( frame );
 112
 113         // Obtain the producer for this frame
 114         mlt_producer producer = mlt_properties_get_data( properties, "producer_colour", NULL );
 115
 116         // Obtain properties of producer
 117         mlt_properties producer_props = mlt_producer_properties( producer );
 118
 119         // Get the current image and dimensions cached in the producer
 120         uint8_t *image = mlt_properties_get_data( producer_props, "image", &size );
 121         int current_width = mlt_properties_get_int( producer_props, "width" );
 122         int current_height = mlt_properties_get_int( producer_props, "height" );
 123
 124         // See if we need to regenerate
 125         if ( *width != current_width || *height != current_height )
 126         {
 127                 // Allocate the image
 128                 size = *width * *height * 2;
 129                 image = mlt_pool_alloc( size );
 130
 131                 // Update the producer
 132                 mlt_properties_set_data( producer_props, "image", image, size, mlt_pool_release, NULL );
 133                 mlt_properties_set_int( producer_props, "width", *width );
 134                 mlt_properties_set_int( producer_props, "height", *height );
 135
 136                 // Color the image
 137                 rgba_color color = parse_color( mlt_properties_get( producer_props, "resource" ) );
 138                 uint8_t y, u, v;
 139                 int i;
 140                 RGB2YUV( color.r, color.g, color.b, y, u, v );
 141                 color.r = y;
 142                 color.g = u;
 143                 color.b = y;
 144                 color.a = v;
 145                 for ( i = 0; i < size; i += 4 )
 146                         memcpy( &image[ i ], &color, 4 );
 147         }
 148
 149         // Update the frame
 150         mlt_properties_set_data( properties, "image", image, size, NULL, NULL );
 151         mlt_properties_set_int( properties, "width", *width );
 152         mlt_properties_set_int( properties, "height", *height );
 153
 154         // Clone if necessary
 155         if ( writable )
 156         {
 157                 // Clone our image
 158                 uint8_t *copy = mlt_pool_alloc( size );
 159                 memcpy( copy, image, size );
 160
 161                 // We're going to pass the copy on
 162                 image = copy;
 163
 164                 // Now update properties so we free the copy after
 165                 mlt_properties_set_data( properties, "image", copy, size, mlt_pool_release, NULL );
 166         }
 167
 168         // Pass on the image
 169         *buffer = image;
 170         *format = mlt_image_yuv422;
 171
 172         return 0;
 173 }
 174
 175 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 176 {
 177         // Generate a frame
 178         *frame = mlt_frame_init( );
 179
 180         if ( *frame != NULL )
 181         {
 182                 // Obtain properties of frame and producer
 183                 mlt_properties properties = mlt_frame_properties( *frame );
 184
 185                 // Obtain properties of producer
 186                 mlt_properties producer_props = mlt_producer_properties( producer );
 187
 188                 // Set the producer on the frame properties
 189                 mlt_properties_set_data( properties, "producer_colour", producer, 0, NULL, NULL );
 190
 191                 // Update timecode on the frame we're creating
 192                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 193
 194                 // Set producer-specific frame properties
 195                 mlt_properties_set_int( properties, "progressive", 1 );
 196
 197                 // colour is an alias for resource
 198                 if ( mlt_properties_get( producer_props, "colour" ) != NULL )
 199                         mlt_properties_set( producer_props, "resource", mlt_properties_get( producer_props, "colour" ) );
 200
 201                 // Push the get_image method
 202                 mlt_frame_push_get_image( *frame, producer_get_image );
 203         }
 204
 205         // Calculate the next timecode
 206         mlt_producer_prepare_next( producer );
 207
 208         return 0;
 209 }
 210
 211 static void producer_close( mlt_producer producer )
 212 {
 213         producer->close = NULL;
 214         mlt_producer_close( producer );
 215         free( producer );
 216 }
 217