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