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 program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "producer_hold.h"
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include <framework/mlt.h>
  28
  29 // Forward references
  30 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  31 static void producer_close( mlt_producer this );
  32
  33 /** Constructor for the frame holding producer. Basically, all this producer does is
  34         provide a producer wrapper for the requested producer, allows the specifcation of
  35         the frame required and will then repeatedly obtain that frame for each get_frame
  36         and get_image requested.
  37 */
  38
  39 mlt_producer producer_hold_init( char *arg )
  40 {
  41         // Construct a new holding producer
  42         mlt_producer this = mlt_producer_new( );
  43
  44         // Construct the requested producer via fezzik
  45         mlt_producer producer = mlt_factory_producer( "fezzik", arg );
  46
  47         // Initialise the frame holding capabilities
  48         if ( this != NULL && producer != NULL )
  49         {
  50                 // Get the properties of this producer
  51                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
  52
  53                 // Store the producer
  54                 mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
  55
  56                 // Set frame, in, out and length for this producer
  57                 mlt_properties_set_position( properties, "frame", 0 );
  58                 mlt_properties_set_position( properties, "in", 0 );
  59                 mlt_properties_set_position( properties, "out", 25 );
  60                 mlt_properties_set_position( properties, "length", 15000 );
  61                 mlt_properties_set( properties, "resource", arg );
  62                 mlt_properties_set( properties, "method", "onefield" );
  63
  64                 // Override the get_frame method
  65                 this->get_frame = producer_get_frame;
  66                 this->close = ( mlt_destructor )producer_close;
  67         }
  68         else
  69         {
  70                 // Clean up (not sure which one failed, can't be bothered to find out, so close both)
  71                 if ( this )
  72                         mlt_producer_close( this );
  73                 if ( producer )
  74                         mlt_producer_close( producer );
  75
  76                 // Make sure we return NULL
  77                 this = NULL;
  78         }
  79
  80         // Return this producer
  81         return this;
  82 }
  83
  84 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  85 {
  86         // Get the properties of the frame
  87         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  88
  89         // Obtain the real frame
  90         mlt_frame real_frame = mlt_frame_pop_service( frame );
  91
  92         // Get the image from the real frame
  93         int size = 0;
  94         *buffer = mlt_properties_get_data( MLT_FRAME_PROPERTIES( real_frame ), "image", &size );
  95         *width = mlt_properties_get_int( MLT_FRAME_PROPERTIES( real_frame ), "width" );
  96         *height = mlt_properties_get_int( MLT_FRAME_PROPERTIES( real_frame ), "height" );
  97
  98         // If this is the first time, get it from the producer
  99         if ( *buffer == NULL )
 100         {
 101                 mlt_properties_pass( MLT_FRAME_PROPERTIES( real_frame ), properties, "" );
 102
 103                 // We'll deinterlace on the downstream deinterlacer
 104                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( real_frame ), "consumer_deinterlace", 1 );
 105
 106                 // We want distorted to ensure we don't hit the resize filter twice
 107                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( real_frame ), "distort", 1 );
 108
 109                 // Get the image
 110                 mlt_frame_get_image( real_frame, buffer, format, width, height, writable );
 111
 112                 // Make sure we get the size
 113                 *buffer = mlt_properties_get_data( MLT_FRAME_PROPERTIES( real_frame ), "image", &size );
 114         }
 115
 116         mlt_properties_pass( properties, MLT_FRAME_PROPERTIES( real_frame ), "" );
 117
 118         // Set the values obtained on the frame
 119         if ( *buffer != NULL )
 120         {
 121                 uint8_t *image = mlt_pool_alloc( size );
 122                 memcpy( image, *buffer, size );
 123                 *buffer = image;
 124                 mlt_properties_set_data( properties, "image", *buffer, size, mlt_pool_release, NULL );
 125         }
 126         else
 127         {
 128                 // Pass the current image as is
 129                 mlt_properties_set_data( properties, "image", *buffer, size, NULL, NULL );
 130         }
 131
 132         // Make sure that no further scaling is done
 133         mlt_properties_set( properties, "rescale.interps", "none" );
 134         mlt_properties_set( properties, "scale", "off" );
 135
 136         // All done
 137         return 0;
 138 }
 139
 140 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 141 {
 142         // Get the properties of this producer
 143         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 144
 145         // Construct a new frame
 146         *frame = mlt_frame_init( );
 147
 148         // If we have a frame, then stack the producer itself and the get_image method
 149         if ( *frame != NULL )
 150         {
 151                 // Define the real frame
 152                 mlt_frame real_frame = mlt_properties_get_data( properties, "real_frame", NULL );
 153
 154                 // Obtain real frame if we don't have it
 155                 if ( real_frame == NULL )
 156                 {
 157                         // Get the producer
 158                         mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
 159
 160                         // Get the frame position requested
 161                         mlt_position position = mlt_properties_get_position( properties, "frame" );
 162
 163                         // Seek the producer to the correct place
 164                         mlt_producer_seek( producer, position );
 165
 166                         // Get the real frame
 167                         mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &real_frame, index );
 168
 169                         // Ensure that the real frame gets wiped eventually
 170                         mlt_properties_set_data( properties, "real_frame", real_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
 171                 }
 172                 else
 173                 {
 174                         // Temporary fix - ensure that we aren't seen as a test frame
 175                         int8_t *image = mlt_properties_get_data( MLT_FRAME_PROPERTIES( real_frame ), "image", NULL );
 176                         mlt_properties_set_data( MLT_FRAME_PROPERTIES( *frame ), "image", image, 0, NULL, NULL );
 177                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "test_image", 0 );
 178                 }
 179
 180                 // Stack the real frame and method
 181                 mlt_frame_push_service( *frame, real_frame );
 182                 mlt_frame_push_service( *frame, producer_get_image );
 183
 184                 // Ensure that the consumer sees what the real frame has
 185                 mlt_properties_pass( MLT_FRAME_PROPERTIES( *frame ), MLT_FRAME_PROPERTIES( real_frame ), "" );
 186
 187                 mlt_properties_set( MLT_FRAME_PROPERTIES( real_frame ), "deinterlace_method",
 188                         mlt_properties_get( properties, "method" ) );
 189         }
 190
 191         // Move to the next position
 192         mlt_producer_prepare_next( this );
 193
 194         return 0;
 195 }
 196
 197 static void producer_close( mlt_producer this )
 198 {
 199         this->close = NULL;
 200         mlt_producer_close( this );
 201         free( this );
 202 }
 203