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 <framework/mlt.h>
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <math.h>
  26 #include <string.h>
  27 #include <sys/time.h>
  28 #include <assert.h>
  29
  30 // Forward references.
  31 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  32
  33 /** Image stack(able) method
  34 */
  35
  36 static int framebuffer_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  37 {
  38
  39         // Get the filter object and properties
  40         mlt_producer producer = mlt_frame_pop_service( this );
  41         mlt_frame first_frame = mlt_frame_pop_service( this );
  42
  43         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
  44
  45         // Frame properties objects
  46         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( this );
  47         mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
  48
  49         *width = mlt_properties_get_int( frame_properties, "width" );
  50         *height = mlt_properties_get_int( frame_properties, "height" );
  51
  52         int size;
  53         switch ( *format )
  54         {
  55                 case mlt_image_yuv420p:
  56                         size = *width * 3 * ( *height + 1 ) / 2;
  57                         break;
  58                 case mlt_image_rgb24:
  59                         size = *width * ( *height + 1 ) * 3;
  60                         break;
  61                 default:
  62                         *format = mlt_image_yuv422;
  63                         size = *width * ( *height + 1 ) * 2;
  64                         break;
  65         }
  66
  67         uint8_t *output = mlt_properties_get_data( producer_properties, "output_buffer", NULL );
  68
  69         if( output == NULL )
  70         {
  71                 output = mlt_pool_alloc( size );
  72
  73                 // Let someone else clean up
  74                 mlt_properties_set_data( producer_properties, "output_buffer", output, size, mlt_pool_release, NULL );
  75         }
  76
  77         uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
  78
  79         // which frames are buffered?
  80
  81         int error = 0;
  82
  83         if( first_image == NULL )
  84         {
  85                 mlt_properties props = MLT_FRAME_PROPERTIES( this );
  86                 mlt_properties test_properties = MLT_FRAME_PROPERTIES( first_frame );
  87                 mlt_properties_set_double( test_properties, "consumer_aspect_ratio", mlt_properties_get_double( props, "consumer_aspect_ratio" ) );
  88                 mlt_properties_set( test_properties, "rescale.interp", mlt_properties_get( props, "rescale.interp" ) );
  89
  90                 error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
  91
  92                 if( error != 0 ) {
  93                         fprintf(stderr, "first_image == NULL get image died\n");
  94                         return error;
  95                 }
  96         }
  97
  98         // Start with a base image
  99         memcpy( output, first_image, size );
 100
 101         *image = output;
 102         mlt_properties_set_data( frame_properties, "image", output, size, NULL, NULL );
 103
 104         // Make sure that no further scaling is done
 105         mlt_properties_set( frame_properties, "rescale.interps", "none" );
 106         mlt_properties_set( frame_properties, "scale", "off" );
 107
 108         mlt_frame_close( first_frame );
 109
 110         return 0;
 111 }
 112
 113 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 114 {
 115         // Construct a new frame
 116         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
 117         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 118
 119         if( frame != NULL )
 120         {
 121                 mlt_frame first_frame = mlt_properties_get_data( properties, "first_frame", NULL );
 122
 123                 mlt_position first_position = (first_frame != NULL) ? mlt_frame_get_position( first_frame ) : -1;
 124
 125                 // Get the real producer
 126                 mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
 127
 128                 // get properties
 129                 int strobe = mlt_properties_get_int( properties, "strobe");
 130                 int freeze = mlt_properties_get_int( properties, "freeze");
 131                 int freeze_after = mlt_properties_get_int( properties, "freeze_after");
 132                 int freeze_before = mlt_properties_get_int( properties, "freeze_before");
 133
 134                 mlt_position need_first;
 135
 136                 if (!freeze || freeze_after || freeze_before) {
 137                         double prod_speed = mlt_properties_get_double( properties, "_speed");
 138                         double actual_position = prod_speed * (double) mlt_producer_position( this );
 139
 140                         if (mlt_properties_get_int( properties, "reverse")) actual_position = mlt_producer_get_playtime(this) - actual_position;
 141
 142                         if (strobe < 2)
 143                         {
 144                                 need_first = floor( actual_position );
 145                         }
 146                         else
 147                         {
 148                                 // Strobe effect wanted, calculate frame position
 149                                 need_first = floor( actual_position );
 150                                 need_first -= need_first%strobe;
 151                         }
 152                         if (freeze)
 153                         {
 154                                 if (freeze_after && need_first > freeze) need_first = freeze;
 155                                 else if (freeze_before && need_first < freeze) need_first = freeze;
 156                         }
 157                 }
 158                 else need_first = freeze;
 159
 160                 if( need_first != first_position )
 161                 {
 162                         mlt_frame_close( first_frame );
 163                         first_position = -1;
 164                         first_frame = NULL;
 165                 }
 166
 167                 if( first_frame == NULL )
 168                 {
 169                         // Seek the producer to the correct place
 170                         mlt_producer_seek( real_producer, need_first );
 171
 172                         // Get the frame
 173                         mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
 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         }
 190
 191         return 0;
 192 }
 193
 194
 195 mlt_producer producer_framebuffer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 196 {
 197         if ( !arg ) return NULL;
 198         mlt_producer this = NULL;
 199         this = calloc( 1, sizeof( struct mlt_producer_s ) );
 200         mlt_producer_init( this, NULL );
 201
 202         // Wrap fezzik
 203         mlt_producer real_producer;
 204
 205         // Check if a speed was specified.
 206         /**
 207
 208         * Speed must be appended to the filename with '?'. To play your video at 50%:
 209          inigo framebuffer:my_video.mpg?0.5
 210
 211         * Stroboscope effect can be obtained by adding a stobe=x parameter, where
 212          x is the number of frames that will be ignored.
 213
 214         * You can play the movie backwards by adding reverse=1
 215
 216         * You can freeze the clip at a determined position by adding freeze=frame_pos
 217           add freeze_after=1 to freeze only paste position or freeze_before to freeze before it
 218
 219         **/
 220
 221         double speed = 0.0;
 222         char *props = strdup( arg );
 223         char *ptr = strrchr( props, '?' );
 224
 225         if ( ptr )
 226         {
 227                 speed = atof( ptr + 1 );
 228                 if ( speed != 0.0 )
 229                         // If speed was valid, then strip it and the delimiter.
 230                         // Otherwise, an invalid speed probably means this '?' was not a delimiter.
 231                         *ptr = '\0';
 232         }
 233
 234         real_producer = mlt_factory_producer( profile, "fezzik", props );
 235         free( props );
 236
 237         if (speed == 0.0) speed = 1.0;
 238
 239         if ( this != NULL && real_producer != NULL)
 240         {
 241                 // Get the properties of this producer
 242                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 243
 244                 // Fezzik normalised it for us already
 245                 mlt_properties_set_int( properties, "fezzik_normalised", 1);
 246                 mlt_properties_set( properties, "resource", arg);
 247
 248                 // Store the producer and fitler
 249                 mlt_properties_set_data( properties, "producer", real_producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 250
 251                 // Grab some stuff from the real_producer
 252                 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "length, width,height" );
 253
 254                 if ( speed < 0 )
 255                 {
 256                         speed = -speed;
 257                         mlt_properties_set_int( properties, "reverse", 1 );
 258                 }
 259
 260                 if ( speed != 1.0 )
 261                 {
 262                         double real_length = ( (double)  mlt_producer_get_length( real_producer ) ) / speed;
 263                         mlt_properties_set_position( properties, "length", real_length );
 264                 }
 265                 mlt_properties_set_position( properties, "out", mlt_producer_get_length( this ) - 1 );
 266
 267                 // Since we control the seeking, prevent it from seeking on its own
 268                 mlt_producer_set_speed( real_producer, 0 );
 269                 mlt_producer_set_speed( this, speed );
 270
 271                 // Override the get_frame method
 272                 this->get_frame = producer_get_frame;
 273         }
 274         else
 275         {
 276                 if ( this )
 277                         mlt_producer_close( this );
 278                 if ( real_producer )
 279                         mlt_producer_close( real_producer );
 280
 281                 this = NULL;
 282         }
 283         return this;
 284 }