--- /dev/null
+/*
+ * producer_framebuffer.c -- create subspeed frames
+ * Author: Jean-Baptiste Mardelle, based on the code of motion_est by Zachary Drew
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "producer_framebuffer.h"
+#include <framework/mlt.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <sys/time.h>
+#include <assert.h>
+
+// Image stack(able) method
+static int framebuffer_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
+{
+
+ // Get the filter object and properties
+ mlt_producer producer = mlt_frame_pop_service( this );
+ mlt_frame first_frame = mlt_frame_pop_service( this );
+
+ mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
+
+
+ // Frame properties objects
+ mlt_properties frame_properties = MLT_FRAME_PROPERTIES( this );
+ mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
+
+ // image stride
+ int size, xstride, ystride;
+ switch( *format ){
+ case mlt_image_yuv422:
+ size = *width * *height * 2;
+ xstride = 2;
+ ystride = 2 * *width;
+ break;
+ default:
+ fprintf(stderr, "Unsupported image format\n");
+ return -1;
+ }
+
+ uint8_t *output = mlt_properties_get_data( producer_properties, "output_buffer", 0 );
+ if( output == NULL )
+ {
+ output = mlt_pool_alloc( size );
+
+ // Let someone else clean up
+ mlt_properties_set_data( producer_properties, "output_buffer", output, size, mlt_pool_release, NULL );
+ }
+
+ uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
+
+ // which frames are buffered?
+
+ int error = 0;
+
+ if( first_image == NULL )
+ {
+ error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
+
+ if( error != 0 ) {
+ fprintf(stderr, "first_image == NULL get image died\n");
+ return error;
+ }
+ }
+
+ // Start with a base image
+ memcpy( output, first_image, size );
+
+ *image = output;
+ mlt_properties_set_data( frame_properties, "image", output, size, NULL, NULL );
+
+ // Make sure that no further scaling is done
+ mlt_properties_set( frame_properties, "rescale.interps", "none" );
+ mlt_properties_set( frame_properties, "scale", "off" );
+
+ mlt_frame_close( first_frame );
+
+ return 0;
+}
+
+static int framebuffer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
+{
+ // Construct a new frame
+ *frame = mlt_frame_init( );
+ mlt_properties properties = MLT_PRODUCER_PROPERTIES(this);
+
+ if( frame != NULL )
+ {
+ mlt_frame first_frame = mlt_properties_get_data( properties, "first_frame", NULL );
+
+ mlt_position first_position = (first_frame != NULL) ? mlt_frame_get_position( first_frame ) : -1;
+
+ // Get the real producer
+ mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
+
+ // Our "in" needs to be the same, keep it so
+ mlt_properties_pass_list( MLT_PRODUCER_PROPERTIES( real_producer ), properties, "in" );
+
+ // get properties
+ int strobe = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES (this), "strobe");
+ double prod_speed = mlt_properties_get_double( properties, "_speed");
+ double prod_end_speed = mlt_properties_get_double( properties, "end_speed");
+
+ // calculate actual speed and position
+ double actual_speed = prod_speed + ((double)mlt_producer_position( this ) / (double)mlt_producer_get_length(this)) * (prod_end_speed - prod_speed);
+ double actual_position = actual_speed * (double)mlt_producer_position( this );
+ if (mlt_properties_get_int( properties, "reverse")) actual_position = mlt_producer_get_length(this) - actual_position;
+
+ mlt_position need_first;
+
+
+ if (strobe == 1)
+ {
+ need_first = floor( actual_position );
+ }
+ else
+ {
+ // Strobe effect wanted, calculate frame position
+ need_first = floor( actual_position );
+ need_first -= need_first%strobe;
+ }
+
+ if( need_first != first_position )
+ {
+ mlt_frame_close( first_frame );
+ first_position = -1;
+ first_frame = NULL;
+ }
+
+ if( first_frame == NULL )
+ {
+ // Seek the producer to the correct place
+ mlt_producer_seek( real_producer, need_first );
+
+ // Get the frame
+ mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
+ }
+
+
+ // Make sure things are in their place
+ mlt_properties_set_data( properties, "first_frame", first_frame, 0, NULL, NULL );
+
+ // Stack the producer and producer's get image
+ mlt_frame_push_service( *frame, first_frame );
+ mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( first_frame ) );
+
+ mlt_frame_push_service( *frame, this );
+ mlt_frame_push_service( *frame, framebuffer_get_image );
+
+ // Give the returned frame temporal identity
+ mlt_frame_set_position( *frame, mlt_producer_position( this ) );
+
+ }
+
+ return 0;
+}
+
+
+mlt_producer producer_framebuffer_init( char *arg )
+{
+ mlt_producer this = mlt_producer_new( );
+ fprintf( stderr, " + + ++ USING FRAMEBUFF %s\n", arg);
+ // Wrap fezzik
+ mlt_producer real_producer;
+
+ // Check if a speed was specified.
+ /**
+
+ * Speed must be appended to the filename with ':'. To play your video at 50%:
+ inigo framebuffer:my_video.mpg:0.5
+
+ * You can have a variabl speed by specifying a start and an end speed:
+ inigo framebuffer:my_video.mpg:0.5:1.0
+
+ * Stroboscope effect can be obtained by adding a stobe=x parameter, where
+ x is the number of frames that will be ignored.
+
+ * You can play the movie backwards by adding reverse=1
+ **/
+
+ double speed;
+ double end_speed;
+ int count;
+ char *props = strdup( arg );
+ char *ptr = props;
+ count = strcspn( ptr, ":" );
+ ptr[count] = '\0';
+ real_producer = mlt_factory_producer( "fezzik", ptr );
+
+ ptr += count + 1;
+ ptr += strspn( ptr, ":" );
+ count = strcspn( ptr, ":" );
+ ptr[count] = '\0';
+ speed = atof(ptr);
+
+ ptr += count + 1;
+ ptr += strspn( ptr, ":" );
+ count = strcspn( ptr, ":" );
+ ptr[count] = '\0';
+ end_speed = atof(ptr);
+ free( props );
+
+ // If no end speed specified, use constant speed
+ if (speed == 0.0) speed = 1.0;
+ if (end_speed == 0.0) end_speed = speed;
+
+
+ if ( this != NULL && real_producer != NULL)
+ {
+ // Get the properties of this producer
+ mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
+
+ // Fezzik normalised it for us already
+ mlt_properties_set_int( properties, "fezzik_normalised", 1);
+
+ // Store the producer and fitler
+ mlt_properties_set_data( properties, "producer", real_producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
+
+ // Grap some stuff from the real_producer
+ mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ),
+ "in, out, length, resource" );
+
+ if (speed != 1.0 || end_speed !=1.0)
+ {
+ // Speed is not 1.0, so adjust the clip length
+ mlt_position real_out = mlt_properties_get_position(properties, "out");
+ mlt_properties_set_position( properties, "out", real_out * 2 / (speed + end_speed));
+ mlt_properties_set_position( properties, "length", real_out * 2 / (speed + end_speed) + 1);
+ mlt_properties_set_double( properties, "_speed", speed);
+ mlt_properties_set_double( properties, "end_speed", end_speed);
+ }
+ else mlt_properties_set_double( properties, "end_speed", 1.0);
+
+ // Since we control the seeking, prevent it from seeking on its own
+ mlt_producer_set_speed( real_producer, 0 );
+ mlt_producer_set_speed( this, speed );
+
+ // Override the get_frame method
+ this->get_frame = framebuffer_get_frame;
+
+ }
+ else
+ {
+ if ( this )
+ mlt_producer_close( this );
+ if ( real_producer )
+ mlt_producer_close( real_producer );
+
+ this = NULL;
+ }
+ return this;
+}
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