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) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   5  *         Charles Yates <charles.yates@gmail.com>
   6  *
   7  * NB: This module is designed to be functionally equivalent to the
   8  * gtk2 image loading module so it can be used as replacement.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  */
  24
  25 #include "producer_qimage.h"
  26 #include "qimage_wrapper.h"
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <math.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <unistd.h>
  35
  36 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  37 static void producer_close( mlt_producer parent );
  38
  39 mlt_producer producer_qimage_init( char *filename )
  40 {
  41         producer_qimage this = calloc( sizeof( struct producer_qimage_s ), 1 );
  42         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  43         {
  44                 mlt_producer producer = &this->parent;
  45
  46                 // Get the properties interface
  47                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( &this->parent );
  48
  49                 // Callback registration
  50                 producer->get_frame = producer_get_frame;
  51                 producer->close = ( mlt_destructor )producer_close;
  52
  53                 // Set the default properties
  54                 mlt_properties_set( properties, "resource", filename );
  55                 mlt_properties_set_int( properties, "ttl", 25 );
  56                 mlt_properties_set_int( properties, "aspect_ratio", 1 );
  57                 mlt_properties_set_int( properties, "progressive", 1 );
  58
  59                 return producer;
  60         }
  61         free( this );
  62         return NULL;
  63 }
  64
  65 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  66 {
  67         // Obtain properties of frame
  68         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  69
  70         // We need to know the size of the image to clone it
  71         int image_size = 0;
  72         int alpha_size = 0;
  73
  74         // Alpha channel
  75         uint8_t *alpha = NULL;
  76
  77         *width = mlt_properties_get_int( properties, "rescale_width" );
  78         *height = mlt_properties_get_int( properties, "rescale_height" );
  79
  80         // Refresh the image
  81         refresh_qimage( frame, *width, *height );
  82
  83         // Get the image
  84         *buffer = mlt_properties_get_data( properties, "image", &image_size );
  85         alpha = mlt_properties_get_data( properties, "alpha", &alpha_size );
  86
  87         // Get width and height (may have changed during the refresh)
  88         *width = mlt_properties_get_int( properties, "width" );
  89         *height = mlt_properties_get_int( properties, "height" );
  90
  91         // NB: Cloning is necessary with this producer (due to processing of images ahead of use)
  92         // The fault is not in the design of mlt, but in the implementation of the qimage producer...
  93         if ( *buffer != NULL )
  94         {
  95                 // Clone the image and the alpha
  96                 uint8_t *image_copy = mlt_pool_alloc( image_size );
  97                 uint8_t *alpha_copy = mlt_pool_alloc( alpha_size );
  98
  99                 memcpy( image_copy, *buffer, image_size );
 100
 101                 // Copy or default the alpha
 102                 if ( alpha != NULL )
 103                         memcpy( alpha_copy, alpha, alpha_size );
 104                 else
 105                         memset( alpha_copy, 255, alpha_size );
 106
 107                 // Now update properties so we free the copy after
 108                 mlt_properties_set_data( properties, "image", image_copy, image_size, mlt_pool_release, NULL );
 109                 mlt_properties_set_data( properties, "alpha", alpha_copy, alpha_size, mlt_pool_release, NULL );
 110
 111                 // We're going to pass the copy on
 112                 *buffer = image_copy;
 113         }
 114         else
 115         {
 116                 // TODO: Review all cases of invalid images
 117                 *buffer = mlt_pool_alloc( 50 * 50 * 2 );
 118                 mlt_properties_set_data( properties, "image", *buffer, image_size, mlt_pool_release, NULL );
 119                 *width = 50;
 120                 *height = 50;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 127 {
 128         // Obtain properties of frame
 129         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
 130
 131         // Return the alpha mask
 132         return mlt_properties_get_data( properties, "alpha", NULL );
 133 }
 134
 135 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 136 {
 137         // Get the real structure for this producer
 138         producer_qimage this = producer->child;
 139
 140         // Fetch the producers properties
 141         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 142
 143         if ( this->filenames == NULL && mlt_properties_get( producer_properties, "resource" ) != NULL )
 144         {
 145                 char *filename = mlt_properties_get( producer_properties, "resource" );
 146                 this->filenames = mlt_properties_new( );
 147
 148                 // Read xml string
 149                 if ( strstr( filename, "<svg" ) )
 150                 {
 151                         // Generate a temporary file for the svg
 152                         char fullname[ 1024 ] = "/tmp/mlt.XXXXXX";
 153                         int fd = mkstemp( fullname );
 154
 155                         if ( fd > -1 )
 156                         {
 157                                 // Write the svg into the temp file
 158                                 ssize_t remaining_bytes;
 159                                 char *xml = filename;
 160
 161                                 // Strip leading crap
 162                                 while ( xml[0] != '<' )
 163                                         xml++;
 164
 165                                 remaining_bytes = strlen( xml );
 166                                 while ( remaining_bytes > 0 )
 167                                         remaining_bytes -= write( fd, xml + strlen( xml ) - remaining_bytes, remaining_bytes );
 168                                 close( fd );
 169
 170                                 mlt_properties_set( this->filenames, "0", fullname );
 171
 172                                 // Teehe - when the producer closes, delete the temp file and the space allo
 173                                 mlt_properties_set_data( producer_properties, "__temporary_file__", fullname, 0, ( mlt_destructor )unlink, NULL );
 174                         }
 175                 }
 176                 // Obtain filenames
 177                 else if ( strchr( filename, '%' ) != NULL )
 178                 {
 179                         // handle picture sequences
 180                         int i = mlt_properties_get_int( producer_properties, "begin" );
 181                         int gap = 0;
 182                         char full[1024];
 183                         int keyvalue = 0;
 184                         char key[ 50 ];
 185
 186                         while ( gap < 100 )
 187                         {
 188                                 struct stat buf;
 189                                 snprintf( full, 1023, filename, i ++ );
 190                                 if ( stat( full, &buf ) == 0 )
 191                                 {
 192                                         sprintf( key, "%d", keyvalue ++ );
 193                                         mlt_properties_set( this->filenames, "0", full );
 194                                         gap = 0;
 195                                 }
 196                                 else
 197                                 {
 198                                         gap ++;
 199                                 }
 200                         }
 201                 }
 202                 else if ( strstr( filename, "/.all." ) != NULL )
 203                 {
 204                         char wildcard[ 1024 ];
 205                         char *dir_name = strdup( filename );
 206                         char *extension = strrchr( dir_name, '.' );
 207
 208                         *( strstr( dir_name, "/.all." ) + 1 ) = '\0';
 209                         sprintf( wildcard, "*%s", extension );
 210
 211                         mlt_properties_dir_list( this->filenames, dir_name, wildcard, 1 );
 212
 213                         free( dir_name );
 214                 }
 215                 else
 216                 {
 217                         mlt_properties_set( this->filenames, "0", filename );
 218                 }
 219
 220                 this->count = mlt_properties_count( this->filenames );
 221         }
 222
 223         // Generate a frame
 224         *frame = mlt_frame_init( );
 225
 226         if ( *frame != NULL && this->count > 0 )
 227         {
 228                 // Obtain properties of frame and producer
 229                 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 230
 231                 // Set the producer on the frame properties
 232                 mlt_properties_set_data( properties, "producer_qimage", this, 0, NULL, NULL );
 233
 234                 // Update timecode on the frame we're creating
 235                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 236
 237                 // Ensure that we have a way to obtain the position in the get_image
 238                 mlt_properties_set_position( properties, "qimage_position", mlt_producer_position( producer ) );
 239
 240                 // Refresh the image
 241                 refresh_qimage( *frame, 0, 0 );
 242
 243                 // Set producer-specific frame properties
 244                 mlt_properties_set_int( properties, "progressive", mlt_properties_get_int( producer_properties, "progressive" ) );
 245                 mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_properties, "aspect_ratio" ) );
 246
 247                 // Set alpha call back
 248                 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 249
 250                 // Push the get_image method
 251                 mlt_frame_push_get_image( *frame, producer_get_image );
 252         }
 253
 254         // Calculate the next timecode
 255         mlt_producer_prepare_next( producer );
 256
 257         return 0;
 258 }
 259
 260 static void producer_close( mlt_producer parent )
 261 {
 262         producer_qimage this = parent->child;
 263         parent->close = NULL;
 264         mlt_producer_close( parent );
 265         mlt_properties_close( this->filenames );
 266         free( this );
 267 }