research.m1stereo.tv/gitweb/ - melted/blob - src/modules/qimage/producer_qimage.c

   1 /*
   2  * producer_image.c -- a QT/QImage based producer for MLT
   3  * Copyright (C) 2006 Visual Media
   4  * Author: Charles Yates <charles.yates@gmail.com>
   5  *
   6  * NB: This module is designed to be functionally equivalent to the
   7  * gtk2 image loading module so it can be used as replacement.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23
  24 #include <framework/mlt_producer.h>
  25 #include "qimage_wrapper.h"
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <math.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <unistd.h>
  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_qimage_init( mlt_profile profile, mlt_service_type type, const char *id, char *filename )
  39 {
  40         producer_qimage this = calloc( sizeof( struct producer_qimage_s ), 1 );
  41         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  42         {
  43                 mlt_producer producer = &this->parent;
  44
  45                 // Get the properties interface
  46                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( &this->parent );
  47
  48                 // Callback registration
  49 #ifdef USE_KDE
  50                 init_qimage();
  51 #endif
  52                 producer->get_frame = producer_get_frame;
  53                 producer->close = ( mlt_destructor )producer_close;
  54
  55                 // Set the default properties
  56                 mlt_properties_set( properties, "resource", filename );
  57                 mlt_properties_set_int( properties, "ttl", 25 );
  58                 mlt_properties_set_int( properties, "aspect_ratio", 1 );
  59                 mlt_properties_set_int( properties, "progressive", 1 );
  60
  61                 return producer;
  62         }
  63         free( this );
  64         return NULL;
  65 }
  66
  67 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  68 {
  69         // Obtain properties of frame
  70         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  71
  72         // We need to know the size of the image to clone it
  73         int image_size = 0;
  74         int alpha_size = 0;
  75
  76         // Alpha channel
  77         uint8_t *alpha = NULL;
  78
  79         *width = mlt_properties_get_int( properties, "rescale_width" );
  80         *height = mlt_properties_get_int( properties, "rescale_height" );
  81
  82         // Refresh the image
  83         refresh_qimage( frame, *width, *height );
  84
  85         // Get the image
  86         *buffer = mlt_properties_get_data( properties, "image", &image_size );
  87         alpha = mlt_properties_get_data( properties, "alpha", &alpha_size );
  88
  89         // Get width and height (may have changed during the refresh)
  90         *width = mlt_properties_get_int( properties, "width" );
  91         *height = mlt_properties_get_int( properties, "height" );
  92
  93         // NB: Cloning is necessary with this producer (due to processing of images ahead of use)
  94         // The fault is not in the design of mlt, but in the implementation of the qimage producer...
  95         if ( *buffer != NULL )
  96         {
  97                 if ( *format == mlt_image_yuv422 || *format == mlt_image_yuv420p )
  98                 {
  99                         // Clone the image and the alpha
 100                         uint8_t *image_copy = mlt_pool_alloc( image_size );
 101                         uint8_t *alpha_copy = mlt_pool_alloc( alpha_size );
 102
 103                         memcpy( image_copy, *buffer, image_size );
 104
 105                         // Copy or default the alpha
 106                         if ( alpha != NULL )
 107                                 memcpy( alpha_copy, alpha, alpha_size );
 108                         else
 109                                 memset( alpha_copy, 255, alpha_size );
 110
 111                         // Now update properties so we free the copy after
 112                         mlt_properties_set_data( properties, "image", image_copy, image_size, mlt_pool_release, NULL );
 113                         mlt_properties_set_data( properties, "alpha", alpha_copy, alpha_size, mlt_pool_release, NULL );
 114
 115                         // We're going to pass the copy on
 116                         *buffer = image_copy;
 117                 }
 118                 else if ( *format == mlt_image_rgb24a )
 119                 {
 120                         // Clone the image and the alpha
 121                         image_size = *width * ( *height + 1 ) * 4;
 122                         alpha_size = *width * ( *height + 1 );
 123                         uint8_t *image_copy = mlt_pool_alloc( image_size );
 124                         uint8_t *alpha_copy = mlt_pool_alloc( alpha_size );
 125
 126                         mlt_convert_yuv422_to_rgb24a(*buffer, image_copy, (*width)*(*height));
 127
 128                         // Now update properties so we free the copy after
 129                         mlt_properties_set_data( properties, "image", image_copy, image_size, mlt_pool_release, NULL );
 130                         mlt_properties_set_data( properties, "alpha", alpha_copy, alpha_size, mlt_pool_release, NULL );
 131
 132                         // We're going to pass the copy on
 133                         *buffer = image_copy;
 134                 }
 135         }
 136         else
 137         {
 138                 // TODO: Review all cases of invalid images
 139                 *buffer = mlt_pool_alloc( 50 * 50 * 2 );
 140                 mlt_properties_set_data( properties, "image", *buffer, image_size, mlt_pool_release, NULL );
 141                 *width = 50;
 142                 *height = 50;
 143         }
 144
 145         return 0;
 146 }
 147
 148 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 149 {
 150         // Obtain properties of frame
 151         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
 152
 153         // Return the alpha mask
 154         return mlt_properties_get_data( properties, "alpha", NULL );
 155 }
 156
 157 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 158 {
 159         // Get the real structure for this producer
 160         producer_qimage this = producer->child;
 161
 162         // Fetch the producers properties
 163         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 164
 165         if ( this->filenames == NULL && mlt_properties_get( producer_properties, "resource" ) != NULL )
 166         {
 167                 char *filename = mlt_properties_get( producer_properties, "resource" );
 168                 this->filenames = mlt_properties_new( );
 169
 170                 // Read xml string
 171                 if ( strstr( filename, "<svg" ) )
 172                 {
 173                         // Generate a temporary file for the svg
 174                         char fullname[ 1024 ] = "/tmp/mlt.XXXXXX";
 175                         int fd = mkstemp( fullname );
 176
 177                         if ( fd > -1 )
 178                         {
 179                                 // Write the svg into the temp file
 180                                 ssize_t remaining_bytes;
 181                                 char *xml = filename;
 182
 183                                 // Strip leading crap
 184                                 while ( xml[0] != '<' )
 185                                         xml++;
 186
 187                                 remaining_bytes = strlen( xml );
 188                                 while ( remaining_bytes > 0 )
 189                                         remaining_bytes -= write( fd, xml + strlen( xml ) - remaining_bytes, remaining_bytes );
 190                                 close( fd );
 191
 192                                 mlt_properties_set( this->filenames, "0", fullname );
 193
 194                                 // Teehe - when the producer closes, delete the temp file and the space allo
 195                                 mlt_properties_set_data( producer_properties, "__temporary_file__", fullname, 0, ( mlt_destructor )unlink, NULL );
 196                         }
 197                 }
 198                 // Obtain filenames
 199                 else if ( strchr( filename, '%' ) != NULL )
 200                 {
 201                         // handle picture sequences
 202                         int i = mlt_properties_get_int( producer_properties, "begin" );
 203                         int gap = 0;
 204                         char full[1024];
 205                         int keyvalue = 0;
 206                         char key[ 50 ];
 207
 208                         while ( gap < 100 )
 209                         {
 210                                 struct stat buf;
 211                                 snprintf( full, 1023, filename, i ++ );
 212                                 if ( stat( full, &buf ) == 0 )
 213                                 {
 214                                         sprintf( key, "%d", keyvalue ++ );
 215                                         mlt_properties_set( this->filenames, key, full );
 216                                         gap = 0;
 217                                 }
 218                                 else
 219                                 {
 220                                         gap ++;
 221                                 }
 222                         }
 223                 }
 224                 else if ( strstr( filename, "/.all." ) != NULL )
 225                 {
 226                         char wildcard[ 1024 ];
 227                         char *dir_name = strdup( filename );
 228                         char *extension = strrchr( dir_name, '.' );
 229
 230                         *( strstr( dir_name, "/.all." ) + 1 ) = '\0';
 231                         sprintf( wildcard, "*%s", extension );
 232
 233                         mlt_properties_dir_list( this->filenames, dir_name, wildcard, 1 );
 234
 235                         free( dir_name );
 236                 }
 237                 else
 238                 {
 239                         mlt_properties_set( this->filenames, "0", filename );
 240                 }
 241
 242                 this->count = mlt_properties_count( this->filenames );
 243         }
 244
 245         // Generate a frame
 246         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 247
 248         if ( *frame != NULL && this->count > 0 )
 249         {
 250                 // Obtain properties of frame and producer
 251                 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 252
 253                 // Set the producer on the frame properties
 254                 mlt_properties_set_data( properties, "producer_qimage", this, 0, NULL, NULL );
 255
 256                 // Update timecode on the frame we're creating
 257                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 258
 259                 // Ensure that we have a way to obtain the position in the get_image
 260                 mlt_properties_set_position( properties, "qimage_position", mlt_producer_position( producer ) );
 261
 262                 // Refresh the image
 263                 refresh_qimage( *frame, 0, 0 );
 264
 265                 // Set producer-specific frame properties
 266                 mlt_properties_set_int( properties, "progressive", mlt_properties_get_int( producer_properties, "progressive" ) );
 267                 mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_properties, "aspect_ratio" ) );
 268
 269                 // Set alpha call back
 270                 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 271
 272                 // Push the get_image method
 273                 mlt_frame_push_get_image( *frame, producer_get_image );
 274         }
 275
 276         // Calculate the next timecode
 277         mlt_producer_prepare_next( producer );
 278
 279         return 0;
 280 }
 281
 282 static void producer_close( mlt_producer parent )
 283 {
 284         producer_qimage this = parent->child;
 285         parent->close = NULL;
 286         mlt_pool_release( this->current_image );
 287         mlt_pool_release( this->current_alpha );
 288         mlt_producer_close( parent );
 289         mlt_properties_close( this->filenames );
 290         free( this );
 291 }