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