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