research.m1stereo.tv/gitweb/ - melted/blob - src/modules/fezzik/producer_hold.c

   1 /*
   2  * producer_hold.c -- frame holding producer
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include <framework/mlt.h>
  26
  27 // Forward references
  28 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  29 static void producer_close( mlt_producer this );
  30
  31 /** Constructor for the frame holding producer. Basically, all this producer does is
  32         provide a producer wrapper for the requested producer, allows the specifcation of
  33         the frame required and will then repeatedly obtain that frame for each get_frame
  34         and get_image requested.
  35 */
  36
  37 mlt_producer producer_hold_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  38 {
  39         // Construct a new holding producer
  40         mlt_producer this = mlt_producer_new( );
  41
  42         // Construct the requested producer via fezzik
  43         mlt_producer producer = mlt_factory_producer( profile, "fezzik", arg );
  44
  45         // Initialise the frame holding capabilities
  46         if ( this != NULL && producer != NULL )
  47         {
  48                 // Get the properties of this producer
  49                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
  50
  51                 // Store the producer
  52                 mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
  53
  54                 // Set frame, in, out and length for this producer
  55                 mlt_properties_set_position( properties, "frame", 0 );
  56                 mlt_properties_set_position( properties, "in", 0 );
  57                 mlt_properties_set_position( properties, "out", 25 );
  58                 mlt_properties_set_position( properties, "length", 15000 );
  59                 mlt_properties_set( properties, "resource", arg );
  60                 mlt_properties_set( properties, "method", "onefield" );
  61
  62                 // Override the get_frame method
  63                 this->get_frame = producer_get_frame;
  64                 this->close = ( mlt_destructor )producer_close;
  65         }
  66         else
  67         {
  68                 // Clean up (not sure which one failed, can't be bothered to find out, so close both)
  69                 if ( this )
  70                         mlt_producer_close( this );
  71                 if ( producer )
  72                         mlt_producer_close( producer );
  73
  74                 // Make sure we return NULL
  75                 this = NULL;
  76         }
  77
  78         // Return this producer
  79         return this;
  80 }
  81
  82 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  83 {
  84         // Get the properties of the frame
  85         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  86
  87         // Obtain the real frame
  88         mlt_frame real_frame = mlt_frame_pop_service( frame );
  89
  90         // Get the image from the real frame
  91         int size = 0;
  92         *buffer = mlt_properties_get_data( MLT_FRAME_PROPERTIES( real_frame ), "image", &size );
  93         *width = mlt_properties_get_int( MLT_FRAME_PROPERTIES( real_frame ), "width" );
  94         *height = mlt_properties_get_int( MLT_FRAME_PROPERTIES( real_frame ), "height" );
  95
  96         // If this is the first time, get it from the producer
  97         if ( *buffer == NULL )
  98         {
  99                 mlt_properties_pass( MLT_FRAME_PROPERTIES( real_frame ), properties, "" );
 100
 101                 // We'll deinterlace on the downstream deinterlacer
 102                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( real_frame ), "consumer_deinterlace", 1 );
 103
 104                 // We want distorted to ensure we don't hit the resize filter twice
 105                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( real_frame ), "distort", 1 );
 106
 107                 // Get the image
 108                 mlt_frame_get_image( real_frame, buffer, format, width, height, writable );
 109
 110                 // Make sure we get the size
 111                 *buffer = mlt_properties_get_data( MLT_FRAME_PROPERTIES( real_frame ), "image", &size );
 112         }
 113
 114         mlt_properties_pass( properties, MLT_FRAME_PROPERTIES( real_frame ), "" );
 115
 116         // Set the values obtained on the frame
 117         if ( *buffer != NULL )
 118         {
 119                 uint8_t *image = mlt_pool_alloc( size );
 120                 memcpy( image, *buffer, size );
 121                 *buffer = image;
 122                 mlt_properties_set_data( properties, "image", *buffer, size, mlt_pool_release, NULL );
 123         }
 124         else
 125         {
 126                 // Pass the current image as is
 127                 mlt_properties_set_data( properties, "image", *buffer, size, NULL, NULL );
 128         }
 129
 130         // Make sure that no further scaling is done
 131         mlt_properties_set( properties, "rescale.interps", "none" );
 132         mlt_properties_set( properties, "scale", "off" );
 133
 134         // All done
 135         return 0;
 136 }
 137
 138 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 139 {
 140         // Get the properties of this producer
 141         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 142
 143         // Construct a new frame
 144         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
 145
 146         // If we have a frame, then stack the producer itself and the get_image method
 147         if ( *frame != NULL )
 148         {
 149                 // Define the real frame
 150                 mlt_frame real_frame = mlt_properties_get_data( properties, "real_frame", NULL );
 151
 152                 // Obtain real frame if we don't have it
 153                 if ( real_frame == NULL )
 154                 {
 155                         // Get the producer
 156                         mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
 157
 158                         // Get the frame position requested
 159                         mlt_position position = mlt_properties_get_position( properties, "frame" );
 160
 161                         // Seek the producer to the correct place
 162                         mlt_producer_seek( producer, position );
 163
 164                         // Get the real frame
 165                         mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &real_frame, index );
 166
 167                         // Ensure that the real frame gets wiped eventually
 168                         mlt_properties_set_data( properties, "real_frame", real_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
 169                 }
 170                 else
 171                 {
 172                         // Temporary fix - ensure that we aren't seen as a test frame
 173                         int8_t *image = mlt_properties_get_data( MLT_FRAME_PROPERTIES( real_frame ), "image", NULL );
 174                         mlt_properties_set_data( MLT_FRAME_PROPERTIES( *frame ), "image", image, 0, NULL, NULL );
 175                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "test_image", 0 );
 176                 }
 177
 178                 // Stack the real frame and method
 179                 mlt_frame_push_service( *frame, real_frame );
 180                 mlt_frame_push_service( *frame, producer_get_image );
 181
 182                 // Ensure that the consumer sees what the real frame has
 183                 mlt_properties_pass( MLT_FRAME_PROPERTIES( *frame ), MLT_FRAME_PROPERTIES( real_frame ), "" );
 184
 185                 mlt_properties_set( MLT_FRAME_PROPERTIES( real_frame ), "deinterlace_method",
 186                         mlt_properties_get( properties, "method" ) );
 187         }
 188
 189         // Move to the next position
 190         mlt_producer_prepare_next( this );
 191
 192         return 0;
 193 }
 194
 195 static void producer_close( mlt_producer this )
 196 {
 197         this->close = NULL;
 198         mlt_producer_close( this );
 199         free( this );
 200 }
 201