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 "producer_qimage.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( 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                 producer->get_frame = producer_get_frame;
  50                 producer->close = ( mlt_destructor )producer_close;
  51
  52                 // Set the default properties
  53                 mlt_properties_set( properties, "resource", filename );
  54                 mlt_properties_set_int( properties, "ttl", 25 );
  55                 mlt_properties_set_int( properties, "aspect_ratio", 1 );
  56                 mlt_properties_set_int( properties, "progressive", 1 );
  57
  58                 return producer;
  59         }
  60         free( this );
  61         return NULL;
  62 }
  63
  64 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  65 {
  66         // Obtain properties of frame
  67         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  68
  69         // We need to know the size of the image to clone it
  70         int image_size = 0;
  71         int alpha_size = 0;
  72
  73         // Alpha channel
  74         uint8_t *alpha = NULL;
  75
  76         *width = mlt_properties_get_int( properties, "rescale_width" );
  77         *height = mlt_properties_get_int( properties, "rescale_height" );
  78
  79         // Refresh the image
  80         refresh_qimage( frame, *width, *height );
  81
  82         // Get the image
  83         *buffer = mlt_properties_get_data( properties, "image", &image_size );
  84         alpha = mlt_properties_get_data( properties, "alpha", &alpha_size );
  85
  86         // Get width and height (may have changed during the refresh)
  87         *width = mlt_properties_get_int( properties, "width" );
  88         *height = mlt_properties_get_int( properties, "height" );
  89
  90         // NB: Cloning is necessary with this producer (due to processing of images ahead of use)
  91         // The fault is not in the design of mlt, but in the implementation of the qimage producer...
  92         if ( *buffer != NULL )
  93         {
  94                 if ( *format == mlt_image_yuv422 || *format == mlt_image_yuv420p )
  95                 {
  96                         // Clone the image and the alpha
  97                         uint8_t *image_copy = mlt_pool_alloc( image_size );
  98                         uint8_t *alpha_copy = mlt_pool_alloc( alpha_size );
  99
 100                         memcpy( image_copy, *buffer, image_size );
 101
 102                         // Copy or default the alpha
 103                         if ( alpha != NULL )
 104                                 memcpy( alpha_copy, alpha, alpha_size );
 105                         else
 106                                 memset( alpha_copy, 255, alpha_size );
 107
 108                         // Now update properties so we free the copy after
 109                         mlt_properties_set_data( properties, "image", image_copy, image_size, mlt_pool_release, NULL );
 110                         mlt_properties_set_data( properties, "alpha", alpha_copy, alpha_size, mlt_pool_release, NULL );
 111
 112                         // We're going to pass the copy on
 113                         *buffer = image_copy;
 114                 }
 115                 else if ( *format == mlt_image_rgb24a )
 116                 {
 117                         // Clone the image and the alpha
 118                         image_size = *width * ( *height + 1 ) * 4;
 119                         alpha_size = *width * ( *height + 1 );
 120                         uint8_t *image_copy = mlt_pool_alloc( image_size );
 121                         uint8_t *alpha_copy = mlt_pool_alloc( alpha_size );
 122
 123                         mlt_convert_yuv422_to_rgb24a(*buffer, image_copy, (*width)*(*height));
 124
 125                         // Now update properties so we free the copy after
 126                         mlt_properties_set_data( properties, "image", image_copy, image_size, mlt_pool_release, NULL );
 127                         mlt_properties_set_data( properties, "alpha", alpha_copy, alpha_size, mlt_pool_release, NULL );
 128
 129                         // We're going to pass the copy on
 130                         *buffer = image_copy;
 131                 }
 132         }
 133         else
 134         {
 135                 // TODO: Review all cases of invalid images
 136                 *buffer = mlt_pool_alloc( 50 * 50 * 2 );
 137                 mlt_properties_set_data( properties, "image", *buffer, image_size, mlt_pool_release, NULL );
 138                 *width = 50;
 139                 *height = 50;
 140         }
 141
 142         return 0;
 143 }
 144
 145 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 146 {
 147         // Obtain properties of frame
 148         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
 149
 150         // Return the alpha mask
 151         return mlt_properties_get_data( properties, "alpha", NULL );
 152 }
 153
 154 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 155 {
 156         // Get the real structure for this producer
 157         producer_qimage this = producer->child;
 158
 159         // Fetch the producers properties
 160         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 161
 162         if ( this->filenames == NULL && mlt_properties_get( producer_properties, "resource" ) != NULL )
 163         {
 164                 char *filename = mlt_properties_get( producer_properties, "resource" );
 165                 this->filenames = mlt_properties_new( );
 166
 167                 // Read xml string
 168                 if ( strstr( filename, "<svg" ) )
 169                 {
 170                         // Generate a temporary file for the svg
 171                         char fullname[ 1024 ] = "/tmp/mlt.XXXXXX";
 172                         int fd = mkstemp( fullname );
 173
 174                         if ( fd > -1 )
 175                         {
 176                                 // Write the svg into the temp file
 177                                 ssize_t remaining_bytes;
 178                                 char *xml = filename;
 179
 180                                 // Strip leading crap
 181                                 while ( xml[0] != '<' )
 182                                         xml++;
 183
 184                                 remaining_bytes = strlen( xml );
 185                                 while ( remaining_bytes > 0 )
 186                                         remaining_bytes -= write( fd, xml + strlen( xml ) - remaining_bytes, remaining_bytes );
 187                                 close( fd );
 188
 189                                 mlt_properties_set( this->filenames, "0", fullname );
 190
 191                                 // Teehe - when the producer closes, delete the temp file and the space allo
 192                                 mlt_properties_set_data( producer_properties, "__temporary_file__", fullname, 0, ( mlt_destructor )unlink, NULL );
 193                         }
 194                 }
 195                 // Obtain filenames
 196                 else if ( strchr( filename, '%' ) != NULL )
 197                 {
 198                         // handle picture sequences
 199                         int i = mlt_properties_get_int( producer_properties, "begin" );
 200                         int gap = 0;
 201                         char full[1024];
 202                         int keyvalue = 0;
 203                         char key[ 50 ];
 204
 205                         while ( gap < 100 )
 206                         {
 207                                 struct stat buf;
 208                                 snprintf( full, 1023, filename, i ++ );
 209                                 if ( stat( full, &buf ) == 0 )
 210                                 {
 211                                         sprintf( key, "%d", keyvalue ++ );
 212                                         mlt_properties_set( this->filenames, "0", full );
 213                                         gap = 0;
 214                                 }
 215                                 else
 216                                 {
 217                                         gap ++;
 218                                 }
 219                         }
 220                 }
 221                 else if ( strstr( filename, "/.all." ) != NULL )
 222                 {
 223                         char wildcard[ 1024 ];
 224                         char *dir_name = strdup( filename );
 225                         char *extension = strrchr( dir_name, '.' );
 226
 227                         *( strstr( dir_name, "/.all." ) + 1 ) = '\0';
 228                         sprintf( wildcard, "*%s", extension );
 229
 230                         mlt_properties_dir_list( this->filenames, dir_name, wildcard, 1 );
 231
 232                         free( dir_name );
 233                 }
 234                 else
 235                 {
 236                         mlt_properties_set( this->filenames, "0", filename );
 237                 }
 238
 239                 this->count = mlt_properties_count( this->filenames );
 240         }
 241
 242         // Generate a frame
 243         *frame = mlt_frame_init( );
 244
 245         if ( *frame != NULL && this->count > 0 )
 246         {
 247                 // Obtain properties of frame and producer
 248                 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 249
 250                 // Set the producer on the frame properties
 251                 mlt_properties_set_data( properties, "producer_qimage", this, 0, NULL, NULL );
 252
 253                 // Update timecode on the frame we're creating
 254                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 255
 256                 // Ensure that we have a way to obtain the position in the get_image
 257                 mlt_properties_set_position( properties, "qimage_position", mlt_producer_position( producer ) );
 258
 259                 // Refresh the image
 260                 refresh_qimage( *frame, 0, 0 );
 261
 262                 // Set producer-specific frame properties
 263                 mlt_properties_set_int( properties, "progressive", mlt_properties_get_int( producer_properties, "progressive" ) );
 264                 mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_properties, "aspect_ratio" ) );
 265
 266                 // Set alpha call back
 267                 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 268
 269                 // Push the get_image method
 270                 mlt_frame_push_get_image( *frame, producer_get_image );
 271         }
 272
 273         // Calculate the next timecode
 274         mlt_producer_prepare_next( producer );
 275
 276         return 0;
 277 }
 278
 279 static void producer_close( mlt_producer parent )
 280 {
 281         producer_qimage this = parent->child;
 282         parent->close = NULL;
 283         mlt_producer_close( parent );
 284         mlt_properties_close( this->filenames );
 285         free( this );
 286 }