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

   1 /*
   2  * producer_framebuffer.c -- create subspeed frames
   3  * Author: Jean-Baptiste Mardelle, based on the code of motion_est by Zachary Drew
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software Foundation,
  17  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "producer_framebuffer.h"
  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 // Image stack(able) method
  31 static int framebuffer_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  32 {
  33
  34         // Get the filter object and properties
  35         mlt_producer producer = mlt_frame_pop_service( this );
  36         mlt_frame first_frame = mlt_frame_pop_service( this );
  37
  38         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
  39
  40
  41         // Frame properties objects
  42         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( this );
  43         mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
  44
  45         // image stride
  46         int size, xstride, ystride;
  47         switch( *format ){
  48                 case mlt_image_yuv422:
  49                         size = *width * *height * 2;
  50                         xstride = 2;
  51                         ystride = 2 * *width;
  52                         break;
  53                 default:
  54                         fprintf(stderr, "Unsupported image format\n");
  55                         return -1;
  56         }
  57
  58         uint8_t *output = mlt_properties_get_data( producer_properties, "output_buffer", 0 );
  59         if( output == NULL )
  60         {
  61                 output = mlt_pool_alloc( size );
  62
  63                 // Let someone else clean up
  64                 mlt_properties_set_data( producer_properties, "output_buffer", output, size, mlt_pool_release, NULL );
  65         }
  66
  67         uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
  68
  69         // which frames are buffered?
  70
  71         int error = 0;
  72
  73         if( first_image == NULL )
  74         {
  75                 error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
  76
  77                 if( error != 0 ) {
  78                         fprintf(stderr, "first_image == NULL get image died\n");
  79                         return error;
  80                 }
  81         }
  82
  83         // Start with a base image
  84         memcpy( output, first_image, size );
  85
  86         *image = output;
  87         mlt_properties_set_data( frame_properties, "image", output, size, NULL, NULL );
  88
  89         // Make sure that no further scaling is done
  90         mlt_properties_set( frame_properties, "rescale.interps", "none" );
  91         mlt_properties_set( frame_properties, "scale", "off" );
  92
  93         mlt_frame_close( first_frame );
  94
  95         return 0;
  96 }
  97
  98 static int framebuffer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
  99 {
 100         // Construct a new frame
 101         *frame = mlt_frame_init( );
 102         mlt_properties properties = MLT_PRODUCER_PROPERTIES(this);
 103
 104         if( frame != NULL )
 105         {
 106                 mlt_frame first_frame = mlt_properties_get_data( properties, "first_frame", NULL );
 107
 108                 mlt_position first_position = (first_frame != NULL) ? mlt_frame_get_position( first_frame ) : -1;
 109
 110                 // Get the real producer
 111                 mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
 112
 113                 // Our "in" needs to be the same, keep it so
 114                 mlt_properties_pass_list( MLT_PRODUCER_PROPERTIES( real_producer ), properties, "in" );
 115
 116                 // get properties
 117                 int strobe = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES (this), "strobe");
 118                 double freeze = mlt_properties_get_double( MLT_PRODUCER_PROPERTIES (this), "freeze");
 119                 int freeze_after = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES (this), "freeze_after");
 120                 int freeze_before = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES (this), "freeze_before");
 121
 122                 mlt_position need_first;
 123
 124                 if (!freeze || freeze_after || freeze_before) {
 125                         double prod_speed = mlt_properties_get_double( properties, "_speed");
 126                         double prod_end_speed = mlt_properties_get_double( properties, "end_speed");
 127
 128                         // calculate actual speed and position
 129                         double actual_speed = prod_speed + ((double)mlt_producer_position( this ) / (double)mlt_producer_get_length(this)) * (prod_end_speed - prod_speed);
 130                         double actual_position = actual_speed * (double)mlt_producer_position( this );
 131                         if (mlt_properties_get_int( properties, "reverse")) actual_position = mlt_producer_get_length(this) - actual_position;
 132
 133                         if (strobe < 2)
 134                         {
 135                                 need_first = floor( actual_position );
 136                         }
 137                         else
 138                         {
 139                                 // Strobe effect wanted, calculate frame position
 140                                 need_first = floor( actual_position );
 141                                 need_first -= need_first%strobe;
 142                         }
 143                         if (freeze)
 144                         {
 145                                 if (freeze_after && need_first > freeze) need_first = freeze;
 146                                 else if (freeze_before && need_first < freeze) need_first = freeze;
 147                         }
 148                 }
 149                 else need_first = freeze;
 150
 151                 if( need_first != first_position )
 152                 {
 153                         mlt_frame_close( first_frame );
 154                         first_position = -1;
 155                         first_frame = NULL;
 156                 }
 157
 158                 if( first_frame == NULL )
 159                 {
 160                         // Seek the producer to the correct place
 161                         mlt_producer_seek( real_producer, need_first );
 162
 163                         // Get the frame
 164                         mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
 165                 }
 166
 167
 168                 // Make sure things are in their place
 169                 mlt_properties_set_data( properties, "first_frame", first_frame, 0, NULL, NULL );
 170
 171                 // Stack the producer and producer's get image
 172                 mlt_frame_push_service( *frame, first_frame );
 173                 mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( first_frame ) );
 174
 175                 mlt_frame_push_service( *frame, this );
 176                 mlt_frame_push_service( *frame, framebuffer_get_image );
 177
 178                 // Give the returned frame temporal identity
 179                 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
 180
 181         }
 182
 183         return 0;
 184 }
 185
 186
 187 mlt_producer producer_framebuffer_init( char *arg )
 188 {
 189         mlt_producer this = mlt_producer_new( );
 190
 191         // Wrap fezzik
 192         mlt_producer real_producer;
 193
 194         // Check if a speed was specified.
 195         /**
 196
 197         * Speed must be appended to the filename with ':'. To play your video at 50%:
 198          inigo framebuffer:my_video.mpg:0.5
 199
 200         * You can have a variabl speed by specifying a start and an end speed:
 201         inigo framebuffer:my_video.mpg:0.5:1.0
 202
 203         * Stroboscope effect can be obtained by adding a stobe=x parameter, where
 204          x is the number of frames that will be ignored.
 205
 206         * You can play the movie backwards by adding reverse=1
 207
 208         * You can freeze the clip at a determined position by adding freeze=frame_pos
 209           add freeze_after=1 to freeze only paste position or freeze_before to freeze before it
 210
 211         **/
 212
 213         double speed;
 214         double end_speed;
 215         int count;
 216         char *props = strdup( arg );
 217         char *ptr = props;
 218         count = strcspn( ptr, ":" );
 219         ptr[count] = '\0';
 220         real_producer = mlt_factory_producer( "fezzik", ptr );
 221
 222         ptr += count + 1;
 223         ptr += strspn( ptr, ":" );
 224         count = strcspn( ptr, ":" );
 225         ptr[count] = '\0';
 226         speed = atof(ptr);
 227
 228         ptr += count + 1;
 229         ptr += strspn( ptr, ":" );
 230         count = strcspn( ptr, ":" );
 231         ptr[count] = '\0';
 232         end_speed = atof(ptr);
 233         free( props );
 234
 235         // If no end speed specified, use constant speed
 236         if (speed == 0.0) speed = 1.0;
 237         if (end_speed == 0.0) end_speed = speed;
 238
 239
 240         if ( this != NULL && real_producer != NULL)
 241         {
 242                 // Get the properties of this producer
 243                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 244
 245                 // Fezzik normalised it for us already
 246                 mlt_properties_set_int( properties, "fezzik_normalised", 1);
 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                 // Grap some stuff from the real_producer
 252                 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ),
 253                                 "in, out, length, resource" );
 254
 255                 if (speed != 1.0 || end_speed !=1.0)
 256                 {
 257                         // Speed is not 1.0, so adjust the clip length
 258                         mlt_position real_out = mlt_properties_get_position(properties, "out");
 259                         mlt_properties_set_position( properties, "out", real_out * 2 / (speed + end_speed));
 260                         mlt_properties_set_position( properties, "length", real_out * 2 / (speed + end_speed) + 1);
 261                         mlt_properties_set_double( properties, "_speed", speed);
 262                         mlt_properties_set_double( properties, "end_speed", end_speed);
 263                 }
 264                 else mlt_properties_set_double( properties, "end_speed", 1.0);
 265
 266                 // Since we control the seeking, prevent it from seeking on its own
 267                 mlt_producer_set_speed( real_producer, 0 );
 268                 mlt_producer_set_speed( this, speed );
 269
 270                 // Override the get_frame method
 271                 this->get_frame = framebuffer_get_frame;
 272
 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 }