research.m1stereo.tv/gitweb/ - melted/blob - src/modules/kdenlive/producer_framebuffer.c

   1 /*
   2  * producer_framebuffer.c -- create subspeed frames
   3  * Copyright (C) 2007 Jean-Baptiste Mardelle <jb@ader.ch>
   4  * Author: Jean-Baptiste Mardelle, based on the code of motion_est by Zachary Drew
   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 "producer_framebuffer.h"
  22 #include <framework/mlt.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <math.h>
  27 #include <string.h>
  28 #include <sys/time.h>
  29 #include <assert.h>
  30
  31 // Forward references.
  32 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  33
  34 /** Image stack(able) method
  35 */
  36
  37 static int framebuffer_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  38 {
  39
  40         // Get the filter object and properties
  41         mlt_producer producer = mlt_frame_pop_service( this );
  42         mlt_frame first_frame = mlt_frame_pop_service( this );
  43
  44         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
  45
  46         // Frame properties objects
  47         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( this );
  48         mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
  49
  50         *width = mlt_properties_get_int( frame_properties, "width" );
  51         *height = mlt_properties_get_int( frame_properties, "height" );
  52
  53         int size;
  54         switch ( *format )
  55         {
  56                 case mlt_image_yuv420p:
  57                         size = *width * 3 * ( *height + 1 ) / 2;
  58                         break;
  59                 case mlt_image_rgb24:
  60                         size = *width * ( *height + 1 ) * 3;
  61                         break;
  62                 default:
  63                         *format = mlt_image_yuv422;
  64                         size = *width * ( *height + 1 ) * 2;
  65                         break;
  66         }
  67
  68         uint8_t *output = mlt_properties_get_data( producer_properties, "output_buffer", NULL );
  69
  70         if( output == NULL )
  71         {
  72                 output = mlt_pool_alloc( size );
  73
  74                 // Let someone else clean up
  75                 mlt_properties_set_data( producer_properties, "output_buffer", output, size, mlt_pool_release, NULL );
  76         }
  77
  78         uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
  79
  80         // which frames are buffered?
  81
  82         int error = 0;
  83
  84         if( first_image == NULL )
  85         {
  86                 error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
  87
  88                 if( error != 0 ) {
  89                         fprintf(stderr, "first_image == NULL get image died\n");
  90                         return error;
  91                 }
  92         }
  93
  94         // Start with a base image
  95         memcpy( output, first_image, size );
  96
  97         *image = output;
  98         mlt_properties_set_data( frame_properties, "image", output, size, NULL, NULL );
  99
 100         // Make sure that no further scaling is done
 101         mlt_properties_set( frame_properties, "rescale.interps", "none" );
 102         mlt_properties_set( frame_properties, "scale", "off" );
 103
 104         mlt_frame_close( first_frame );
 105
 106         return 0;
 107 }
 108
 109 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 110 {
 111         // Construct a new frame
 112         *frame = mlt_frame_init( );
 113         mlt_properties properties = MLT_PRODUCER_PROPERTIES(this);
 114
 115         if( frame != NULL )
 116         {
 117                 mlt_frame first_frame = mlt_properties_get_data( properties, "first_frame", NULL );
 118
 119                 mlt_position first_position = (first_frame != NULL) ? mlt_frame_get_position( first_frame ) : -1;
 120
 121                 // Get the real producer
 122                 mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
 123
 124                 // get properties
 125                 int strobe = mlt_properties_get_int( properties, "strobe");
 126                 int freeze = mlt_properties_get_int( properties, "freeze");
 127                 int freeze_after = mlt_properties_get_int( properties, "freeze_after");
 128                 int freeze_before = mlt_properties_get_int( properties, "freeze_before");
 129
 130                 mlt_position need_first;
 131
 132                 if (!freeze || freeze_after || freeze_before) {
 133                         double prod_speed = mlt_properties_get_double( properties, "_speed");
 134                         double actual_position = prod_speed * (double) mlt_producer_position( this );
 135
 136                         if (mlt_properties_get_int( properties, "reverse")) actual_position = mlt_producer_get_playtime(this) - actual_position;
 137
 138                         if (strobe < 2)
 139                         {
 140                                 need_first = floor( actual_position );
 141                         }
 142                         else
 143                         {
 144                                 // Strobe effect wanted, calculate frame position
 145                                 need_first = floor( actual_position );
 146                                 need_first -= need_first%strobe;
 147                         }
 148                         if (freeze)
 149                         {
 150                                 if (freeze_after && need_first > freeze) need_first = freeze;
 151                                 else if (freeze_before && need_first < freeze) need_first = freeze;
 152                         }
 153                 }
 154                 else need_first = freeze;
 155
 156                 if( need_first != first_position )
 157                 {
 158                         mlt_frame_close( first_frame );
 159                         first_position = -1;
 160                         first_frame = NULL;
 161                 }
 162
 163                 if( first_frame == NULL )
 164                 {
 165                         // Seek the producer to the correct place
 166                         mlt_producer_seek( real_producer, need_first );
 167
 168                         // Get the frame
 169                         mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
 170
 171                         double ratio = mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( real_producer ), "aspect_ratio" ) * (double) mlt_properties_get_int( MLT_FRAME_PROPERTIES( first_frame ), "width" ) / (double) mlt_properties_get_int( MLT_FRAME_PROPERTIES( first_frame ), "height" ) / ( (double) mlt_properties_get_int(MLT_FRAME_PROPERTIES( *frame ), "width" ) / (double) mlt_properties_get_int( MLT_FRAME_PROPERTIES( *frame ), "height" ));
 172
 173                         mlt_properties_set_double( properties, "ratio_fix", ratio );
 174                 }
 175
 176                 // Make sure things are in their place
 177                 mlt_properties_set_data( properties, "first_frame", first_frame, 0, NULL, NULL );
 178
 179                 // Stack the producer and producer's get image
 180                 mlt_frame_push_service( *frame, first_frame );
 181                 mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( first_frame ) );
 182
 183                 mlt_frame_push_service( *frame, this );
 184                 mlt_frame_push_service( *frame, framebuffer_get_image );
 185
 186
 187                 // Give the returned frame temporal identity
 188                 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
 189                 mlt_properties_set_double( MLT_FRAME_PROPERTIES(*frame), "aspect_ratio", mlt_properties_get_double( properties, "ratio_fix" ));
 190         }
 191
 192         return 0;
 193 }
 194
 195
 196 mlt_producer producer_framebuffer_init( char *arg )
 197 {
 198
 199         mlt_producer this = NULL;
 200         this = calloc( 1, sizeof( struct mlt_producer_s ) );
 201         mlt_producer_init( this, NULL );
 202
 203         // Wrap fezzik
 204         mlt_producer real_producer;
 205
 206         // Check if a speed was specified.
 207         /**
 208
 209         * Speed must be appended to the filename with ':'. To play your video at 50%:
 210          inigo framebuffer:my_video.mpg:0.5
 211
 212         * Stroboscope effect can be obtained by adding a stobe=x parameter, where
 213          x is the number of frames that will be ignored.
 214
 215         * You can play the movie backwards by adding reverse=1
 216
 217         * You can freeze the clip at a determined position by adding freeze=frame_pos
 218           add freeze_after=1 to freeze only paste position or freeze_before to freeze before it
 219
 220         **/
 221
 222         double speed;
 223
 224         int count;
 225         char *props = strdup( arg );
 226         char *ptr = props;
 227         count = strcspn( ptr, ":" );
 228         ptr[count] = '\0';
 229
 230         real_producer = mlt_factory_producer( "fezzik", props );
 231
 232         ptr += count + 1;
 233         ptr += strspn( ptr, ":" );
 234         count = strcspn( ptr, ":" );
 235         ptr[count] = '\0';
 236         speed = atof(ptr);
 237         free( props );
 238
 239         if (speed == 0.0) speed = 1.0;
 240
 241
 242         if ( this != NULL && real_producer != NULL)
 243         {
 244                 // Get the properties of this producer
 245                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 246
 247                 // Fezzik normalised it for us already
 248                 mlt_properties_set_int( properties, "fezzik_normalised", 1);
 249
 250                 // Store the producer and fitler
 251                 mlt_properties_set_data( properties, "producer", real_producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 252
 253                 // Grab some stuff from the real_producer
 254                 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "length,resource,width,height" );
 255
 256
 257                 if ( speed != 1.0 )
 258                 {
 259                         double real_length = (double)  mlt_producer_get_length( real_producer );
 260                         mlt_properties_set_position( properties, "length", real_length / speed );
 261                 }
 262
 263                 // Since we control the seeking, prevent it from seeking on its own
 264                 mlt_producer_set_speed( real_producer, 0 );
 265                 mlt_producer_set_speed( this, speed );
 266
 267                 // Override the get_frame method
 268                 this->get_frame = producer_get_frame;
 269         }
 270         else
 271         {
 272                 if ( this )
 273                         mlt_producer_close( this );
 274                 if ( real_producer )
 275                         mlt_producer_close( real_producer );
 276
 277                 this = NULL;
 278         }
 279         return this;
 280 }