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