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                 if ( *format == mlt_image_yuv422 || *format == mlt_image_yuv420p )
  96                 {
  97                         // Clone the image and the alpha
  98                         uint8_t *image_copy = mlt_pool_alloc( image_size );
  99                         uint8_t *alpha_copy = mlt_pool_alloc( alpha_size );
 100
 101                         memcpy( image_copy, *buffer, image_size );
 102
 103                         // Copy or default the alpha
 104                         if ( alpha != NULL )
 105                                 memcpy( alpha_copy, alpha, alpha_size );
 106                         else
 107                                 memset( alpha_copy, 255, alpha_size );
 108
 109                         // Now update properties so we free the copy after
 110                         mlt_properties_set_data( properties, "image", image_copy, image_size, mlt_pool_release, NULL );
 111                         mlt_properties_set_data( properties, "alpha", alpha_copy, alpha_size, mlt_pool_release, NULL );
 112
 113                         // We're going to pass the copy on
 114                         *buffer = image_copy;
 115                 }
 116                 else if ( *format == mlt_image_rgb24a )
 117                 {
 118                         // Clone the image and the alpha
 119                         image_size = *width * ( *height + 1 ) * 4;
 120                         alpha_size = *width * ( *height + 1 );
 121                         uint8_t *image_copy = mlt_pool_alloc( image_size );
 122                         uint8_t *alpha_copy = mlt_pool_alloc( alpha_size );
 123
 124                         mlt_convert_yuv422_to_rgb24a(*buffer, image_copy, (*width)*(*height));
 125
 126                         // Now update properties so we free the copy after
 127                         mlt_properties_set_data( properties, "image", image_copy, image_size, mlt_pool_release, NULL );
 128                         mlt_properties_set_data( properties, "alpha", alpha_copy, alpha_size, mlt_pool_release, NULL );
 129
 130                         // We're going to pass the copy on
 131                         *buffer = image_copy;
 132                 }
 133         }
 134         else
 135         {
 136                 // TODO: Review all cases of invalid images
 137                 *buffer = mlt_pool_alloc( 50 * 50 * 2 );
 138                 mlt_properties_set_data( properties, "image", *buffer, image_size, mlt_pool_release, NULL );
 139                 *width = 50;
 140                 *height = 50;
 141         }
 142
 143         return 0;
 144 }
 145
 146 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 147 {
 148         // Obtain properties of frame
 149         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
 150
 151         // Return the alpha mask
 152         return mlt_properties_get_data( properties, "alpha", NULL );
 153 }
 154
 155 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 156 {
 157         // Get the real structure for this producer
 158         producer_qimage this = producer->child;
 159
 160         // Fetch the producers properties
 161         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 162
 163         if ( this->filenames == NULL && mlt_properties_get( producer_properties, "resource" ) != NULL )
 164         {
 165                 char *filename = mlt_properties_get( producer_properties, "resource" );
 166                 this->filenames = mlt_properties_new( );
 167
 168                 // Read xml string
 169                 if ( strstr( filename, "<svg" ) )
 170                 {
 171                         // Generate a temporary file for the svg
 172                         char fullname[ 1024 ] = "/tmp/mlt.XXXXXX";
 173                         int fd = mkstemp( fullname );
 174
 175                         if ( fd > -1 )
 176                         {
 177                                 // Write the svg into the temp file
 178                                 ssize_t remaining_bytes;
 179                                 char *xml = filename;
 180
 181                                 // Strip leading crap
 182                                 while ( xml[0] != '<' )
 183                                         xml++;
 184
 185                                 remaining_bytes = strlen( xml );
 186                                 while ( remaining_bytes > 0 )
 187                                         remaining_bytes -= write( fd, xml + strlen( xml ) - remaining_bytes, remaining_bytes );
 188                                 close( fd );
 189
 190                                 mlt_properties_set( this->filenames, "0", fullname );
 191
 192                                 // Teehe - when the producer closes, delete the temp file and the space allo
 193                                 mlt_properties_set_data( producer_properties, "__temporary_file__", fullname, 0, ( mlt_destructor )unlink, NULL );
 194                         }
 195                 }
 196                 // Obtain filenames
 197                 else if ( strchr( filename, '%' ) != NULL )
 198                 {
 199                         // handle picture sequences
 200                         int i = mlt_properties_get_int( producer_properties, "begin" );
 201                         int gap = 0;
 202                         char full[1024];
 203                         int keyvalue = 0;
 204                         char key[ 50 ];
 205
 206                         while ( gap < 100 )
 207                         {
 208                                 struct stat buf;
 209                                 snprintf( full, 1023, filename, i ++ );
 210                                 if ( stat( full, &buf ) == 0 )
 211                                 {
 212                                         sprintf( key, "%d", keyvalue ++ );
 213                                         mlt_properties_set( this->filenames, "0", full );
 214                                         gap = 0;
 215                                 }
 216                                 else
 217                                 {
 218                                         gap ++;
 219                                 }
 220                         }
 221                 }
 222                 else if ( strstr( filename, "/.all." ) != NULL )
 223                 {
 224                         char wildcard[ 1024 ];
 225                         char *dir_name = strdup( filename );
 226                         char *extension = strrchr( dir_name, '.' );
 227
 228                         *( strstr( dir_name, "/.all." ) + 1 ) = '\0';
 229                         sprintf( wildcard, "*%s", extension );
 230
 231                         mlt_properties_dir_list( this->filenames, dir_name, wildcard, 1 );
 232
 233                         free( dir_name );
 234                 }
 235                 else
 236                 {
 237                         mlt_properties_set( this->filenames, "0", filename );
 238                 }
 239
 240                 this->count = mlt_properties_count( this->filenames );
 241         }
 242
 243         // Generate a frame
 244         *frame = mlt_frame_init( );
 245
 246         if ( *frame != NULL && this->count > 0 )
 247         {
 248                 // Obtain properties of frame and producer
 249                 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 250
 251                 // Set the producer on the frame properties
 252                 mlt_properties_set_data( properties, "producer_qimage", this, 0, NULL, NULL );
 253
 254                 // Update timecode on the frame we're creating
 255                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 256
 257                 // Ensure that we have a way to obtain the position in the get_image
 258                 mlt_properties_set_position( properties, "qimage_position", mlt_producer_position( producer ) );
 259
 260                 // Refresh the image
 261                 refresh_qimage( *frame, 0, 0 );
 262
 263                 // Set producer-specific frame properties
 264                 mlt_properties_set_int( properties, "progressive", mlt_properties_get_int( producer_properties, "progressive" ) );
 265                 mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_properties, "aspect_ratio" ) );
 266
 267                 // Set alpha call back
 268                 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 269
 270                 // Push the get_image method
 271                 mlt_frame_push_get_image( *frame, producer_get_image );
 272         }
 273
 274         // Calculate the next timecode
 275         mlt_producer_prepare_next( producer );
 276
 277         return 0;
 278 }
 279
 280 static void producer_close( mlt_producer parent )
 281 {
 282         producer_qimage this = parent->child;
 283         parent->close = NULL;
 284         mlt_producer_close( parent );
 285         mlt_properties_close( this->filenames );
 286         free( this );
 287 }