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                 mlt_properties_set( properties, "resource", colour == NULL ? "0x000000ff" : colour );
  52
  53                 return producer;
  54         }
  55         free( producer );
  56         return NULL;
  57 }
  58
  59 rgba_color parse_color( char *color )
  60 {
  61         rgba_color result = { 0xff, 0xff, 0xff, 0xff };
  62
  63         if ( !strncmp( color, "0x", 2 ) )
  64         {
  65                 unsigned int temp = 0;
  66                 sscanf( color + 2, "%x", &temp );
  67                 result.r = ( temp >> 24 ) & 0xff;
  68                 result.g = ( temp >> 16 ) & 0xff;
  69                 result.b = ( temp >> 8 ) & 0xff;
  70                 result.a = ( temp ) & 0xff;
  71         }
  72         else if ( !strcmp( color, "red" ) )
  73         {
  74                 result.r = 0xff;
  75                 result.g = 0x00;
  76                 result.b = 0x00;
  77         }
  78         else if ( !strcmp( color, "green" ) )
  79         {
  80                 result.r = 0x00;
  81                 result.g = 0xff;
  82                 result.b = 0x00;
  83         }
  84         else if ( !strcmp( color, "blue" ) )
  85         {
  86                 result.r = 0x00;
  87                 result.g = 0x00;
  88                 result.b = 0xff;
  89         }
  90         else if ( strcmp( color, "white" ) )
  91         {
  92                 unsigned int temp = 0;
  93                 sscanf( color, "%d", &temp );
  94                 result.r = ( temp >> 24 ) & 0xff;
  95                 result.g = ( temp >> 16 ) & 0xff;
  96                 result.b = ( temp >> 8 ) & 0xff;
  97                 result.a = ( temp ) & 0xff;
  98         }
  99
 100         return result;
 101 }
 102
 103 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 104 {
 105         // May need to know the size of the image to clone it
 106         int size = 0;
 107
 108         // Obtain properties of frame
 109         mlt_properties properties = mlt_frame_properties( frame );
 110
 111         // Obtain the producer for this frame
 112         mlt_producer producer = mlt_properties_get_data( properties, "producer_colour", NULL );
 113
 114         // Obtain properties of producer
 115         mlt_properties producer_props = mlt_producer_properties( producer );
 116
 117         // Get the current image and dimensions cached in the producer
 118         uint8_t *image = mlt_properties_get_data( producer_props, "image", &size );
 119         int current_width = mlt_properties_get_int( producer_props, "width" );
 120         int current_height = mlt_properties_get_int( producer_props, "height" );
 121
 122         // See if we need to regenerate
 123         if ( *width != current_width || *height != current_height )
 124         {
 125                 // Allocate the image
 126                 size = *width * *height * 2;
 127                 image = mlt_pool_alloc( size );
 128
 129                 // Update the producer
 130                 mlt_properties_set_data( producer_props, "image", image, size, mlt_pool_release, NULL );
 131                 mlt_properties_set_int( producer_props, "width", *width );
 132                 mlt_properties_set_int( producer_props, "height", *height );
 133
 134                 // Color the image
 135                 rgba_color color = parse_color( mlt_properties_get( producer_props, "resource" ) );
 136                 uint8_t y, u, v;
 137                 int i = 0;
 138                 RGB2YUV( color.r, color.g, color.b, y, u, v );
 139
 140                 while ( i < size )
 141                 {
 142                         image[ i ++ ] = y;
 143                         image[ i ++ ] = u;
 144                         image[ i ++ ] = y;
 145                         image[ i ++ ] = v;
 146                 }
 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                 mlt_properties_set_int( properties, "aspect_ratio", 1 );
 197
 198                 // colour is an alias for resource
 199                 // CY: Do we really need this?
 200                 if ( mlt_properties_get( producer_props, "colour" ) != NULL )
 201                         mlt_properties_set( producer_props, "resource", mlt_properties_get( producer_props, "colour" ) );
 202
 203                 // Push the get_image method
 204                 mlt_frame_push_get_image( *frame, producer_get_image );
 205         }
 206
 207         // Calculate the next timecode
 208         mlt_producer_prepare_next( producer );
 209
 210         return 0;
 211 }
 212
 213 static void producer_close( mlt_producer producer )
 214 {
 215         producer->close = NULL;
 216         mlt_producer_close( producer );
 217         free( producer );
 218 }