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
  32 /** Constructor for the frame holding producer. Basically, all this producer does is
  33         provide a producer wrapper for the requested producer, allows the specifcation of
  34         the frame required and will then repeatedly obtain that frame for each get_frame
  35         and get_image requested.
  36 */
  37
  38 mlt_producer producer_hold_init( char *arg )
  39 {
  40         // Construct a new holding producer
  41         mlt_producer this = mlt_producer_new( );
  42
  43         // Construct the requested producer via fezzik
  44         mlt_producer producer = mlt_factory_producer( "fezzik", arg );
  45
  46         // Initialise the frame holding capabilities
  47         if ( this != NULL && producer != NULL )
  48         {
  49                 // Get the properties of this producer
  50                 mlt_properties properties = mlt_producer_properties( this );
  51
  52                 // Store the producer
  53                 mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
  54
  55                 // Set frame, in, out and length for this producer
  56                 mlt_properties_set_position( properties, "frame", 0 );
  57                 mlt_properties_set_position( properties, "in", 0 );
  58                 mlt_properties_set_position( properties, "out", 25 );
  59                 mlt_properties_set_position( properties, "length", 15000 );
  60
  61                 // Override the get_frame method
  62                 this->get_frame = producer_get_frame;
  63         }
  64         else
  65         {
  66                 // Clean up (not sure which one failed, can't be bothered to find out, so close both)
  67                 mlt_producer_close( this );
  68                 mlt_producer_close( producer );
  69
  70                 // Make sure we return NULL
  71                 this = NULL;
  72         }
  73
  74         // Return this producer
  75         return this;
  76 }
  77
  78 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  79 {
  80         // Get the properties of the frame
  81         mlt_properties properties = mlt_frame_properties( frame );
  82
  83         // Obtain the real frame
  84         mlt_frame real_frame = mlt_frame_pop_service( frame );
  85
  86         // We want distorted to ensure we don't hit the resize filter twice
  87         mlt_properties_set_int( properties, "distort", 1 );
  88
  89         // Get the image from the real frame
  90         mlt_frame_get_image( real_frame, buffer, format, width, height, writable );
  91
  92         // Set the values obtained on the frame
  93         mlt_properties_set_data( properties, "image", *buffer, *width * *height * 2, NULL, NULL );
  94         mlt_properties_set_int( properties, "width", *width );
  95         mlt_properties_set_int( properties, "height", *height );
  96
  97         // We'll deinterlace on the downstream deinterlacer
  98         mlt_properties_set_int( mlt_frame_properties( real_frame ), "consumer_deinterlace", 1 );
  99
 100         // All done
 101         return 0;
 102 }
 103
 104 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 105 {
 106         // Get the properties of this producer
 107         mlt_properties properties = mlt_producer_properties( this );
 108
 109         // Construct a new frame
 110         *frame = mlt_frame_init( );
 111
 112         // If we have a frame, then stack the producer itself and the get_image method
 113         if ( *frame != NULL )
 114         {
 115                 // Define the real frame
 116                 mlt_frame real_frame = NULL;
 117
 118                 // Get the producer
 119                 mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
 120
 121                 // Get the frame position requested
 122                 mlt_position position = mlt_properties_get_position( properties, "frame" );
 123
 124                 // Seek the producer to the correct place
 125                 mlt_producer_seek( producer, position );
 126
 127                 // Get the real frame
 128                 mlt_service_get_frame( mlt_producer_service( producer ), &real_frame, index );
 129
 130                 // Ensure that the real frame gets wiped
 131                 mlt_properties_set_data( mlt_frame_properties( *frame ), "real_frame", real_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
 132
 133                 // Stack the real frame and method
 134                 mlt_frame_push_service( *frame, real_frame );
 135                 mlt_frame_push_service( *frame, producer_get_image );
 136
 137                 // Ensure that the consumer sees what the real frame has
 138                 mlt_properties_pass( mlt_frame_properties( *frame ), mlt_frame_properties( real_frame ), "" );
 139
 140                 // Mirror the properties of the frame
 141                 mlt_properties_mirror( mlt_frame_properties( *frame ), mlt_frame_properties( real_frame ) );
 142         }
 143
 144         // Move to the next position
 145         mlt_producer_prepare_next( this );
 146
 147         return 0;
 148 }