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
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.
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.
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
21 #include "producer_framebuffer.h"
22 #include <framework/mlt.h>
31 // Forward references.
32 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
);
34 /** Image stack(able) method
37 static int framebuffer_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
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 );
44 mlt_properties producer_properties
= MLT_PRODUCER_PROPERTIES( producer
);
46 // Frame properties objects
47 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( this );
48 mlt_properties first_frame_properties
= MLT_FRAME_PROPERTIES( first_frame
);
51 int size
, xstride
, ystride
;
53 case mlt_image_yuv422
:
54 size
= *width
* *height
* 2;
59 fprintf(stderr
, "Unsupported image format\n");
63 uint8_t *output
= mlt_properties_get_data( producer_properties
, "output_buffer", 0 );
66 output
= mlt_pool_alloc( size
);
68 // Let someone else clean up
69 mlt_properties_set_data( producer_properties
, "output_buffer", output
, size
, mlt_pool_release
, NULL
);
72 uint8_t *first_image
= mlt_properties_get_data( first_frame_properties
, "image", NULL
);
74 // which frames are buffered?
78 if( first_image
== NULL
)
80 error
= mlt_frame_get_image( first_frame
, &first_image
, format
, width
, height
, writable
);
83 fprintf(stderr
, "first_image == NULL get image died\n");
88 // Start with a base image
89 memcpy( output
, first_image
, size
);
92 mlt_properties_set_data( frame_properties
, "image", output
, size
, NULL
, NULL
);
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" );
98 mlt_frame_close( first_frame
);
103 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
)
105 // Construct a new frame
106 *frame
= mlt_frame_init( );
107 mlt_properties properties
= MLT_PRODUCER_PROPERTIES(this);
111 mlt_frame first_frame
= mlt_properties_get_data( properties
, "first_frame", NULL
);
113 mlt_position first_position
= (first_frame
!= NULL
) ?
mlt_frame_get_position( first_frame
) : -1;
115 // Get the real producer
116 mlt_producer real_producer
= mlt_properties_get_data( properties
, "producer", NULL
);
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");
124 mlt_position need_first
;
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 );
130 if (mlt_properties_get_int( properties
, "reverse")) actual_position
= mlt_producer_get_playtime(this) - actual_position
;
134 need_first
= floor( actual_position
);
138 // Strobe effect wanted, calculate frame position
139 need_first
= floor( actual_position
);
140 need_first
-= need_first
%strobe
;
144 if (freeze_after
&& need_first
> freeze
) need_first
= freeze
;
145 else if (freeze_before
&& need_first
< freeze
) need_first
= freeze
;
148 else need_first
= freeze
;
150 if( need_first
!= first_position
)
152 mlt_frame_close( first_frame
);
157 if( first_frame
== NULL
)
159 // Seek the producer to the correct place
160 mlt_producer_seek( real_producer
, need_first
);
163 mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer
), &first_frame
, index
);
167 // Make sure things are in their place
168 mlt_properties_set_data( properties
, "first_frame", first_frame
, 0, NULL
, NULL
);
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
) );
174 mlt_frame_push_service( *frame
, this );
175 mlt_frame_push_service( *frame
, framebuffer_get_image
);
177 // Give the returned frame temporal identity
178 mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
186 mlt_producer
producer_framebuffer_init( char *arg
)
189 mlt_producer
this = NULL
;
190 this = calloc( 1, sizeof( struct mlt_producer_s
) );
191 mlt_producer_init( this, NULL
);
194 mlt_producer real_producer
;
196 // Check if a speed was specified.
199 * Speed must be appended to the filename with ':'. To play your video at 50%:
200 inigo framebuffer:my_video.mpg:0.5
202 * Stroboscope effect can be obtained by adding a stobe=x parameter, where
203 x is the number of frames that will be ignored.
205 * You can play the movie backwards by adding reverse=1
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
215 char *props
= strdup( arg
);
217 count
= strcspn( ptr
, ":" );
220 real_producer
= mlt_factory_producer( "fezzik", props
);
223 ptr
+= strspn( ptr
, ":" );
224 count
= strcspn( ptr
, ":" );
229 if (speed
== 0.0) speed
= 1.0;
232 if ( this != NULL
&& real_producer
!= NULL
)
234 // Get the properties of this producer
235 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
237 // Fezzik normalised it for us already
238 mlt_properties_set_int( properties
, "fezzik_normalised", 1);
240 // Store the producer and fitler
241 mlt_properties_set_data( properties
, "producer", real_producer
, 0, ( mlt_destructor
)mlt_producer_close
, NULL
);
243 // Grap some stuff from the real_producer
244 mlt_properties_pass_list( properties
, MLT_PRODUCER_PROPERTIES( real_producer
),
245 "length,resource,width,height" );
249 double real_length
= (double) mlt_producer_get_length( real_producer
);
250 mlt_properties_set_position( properties
, "length", real_length
* 2 / speed
);
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
);
257 // Override the get_frame method
258 this->get_frame
= producer_get_frame
;
263 mlt_producer_close( this );
265 mlt_producer_close( real_producer
);