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
);
50 *width
= mlt_properties_get_int( frame_properties
, "width" );
51 *height
= mlt_properties_get_int( frame_properties
, "height" );
54 int size
, xstride
, ystride
;
56 case mlt_image_yuv422
:
57 size
= *width
* *height
* 2;
62 fprintf(stderr
, "Unsupported image format\n");
66 uint8_t *output
= mlt_properties_get_data( producer_properties
, "output_buffer", 0 );
69 output
= mlt_pool_alloc( size
);
71 // Let someone else clean up
72 mlt_properties_set_data( producer_properties
, "output_buffer", output
, size
, mlt_pool_release
, NULL
);
75 uint8_t *first_image
= mlt_properties_get_data( first_frame_properties
, "image", NULL
);
77 // which frames are buffered?
81 if( first_image
== NULL
)
83 error
= mlt_frame_get_image( first_frame
, &first_image
, format
, width
, height
, writable
);
86 fprintf(stderr
, "first_image == NULL get image died\n");
91 // Start with a base image
92 memcpy( output
, first_image
, size
);
95 mlt_properties_set_data( frame_properties
, "image", output
, size
, NULL
, NULL
);
97 // Make sure that no further scaling is done
98 mlt_properties_set( frame_properties
, "rescale.interps", "none" );
99 mlt_properties_set( frame_properties
, "scale", "off" );
101 mlt_frame_close( first_frame
);
106 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
)
108 // Construct a new frame
109 *frame
= mlt_frame_init( );
110 mlt_properties properties
= MLT_PRODUCER_PROPERTIES(this);
114 mlt_frame first_frame
= mlt_properties_get_data( properties
, "first_frame", NULL
);
116 mlt_position first_position
= (first_frame
!= NULL
) ?
mlt_frame_get_position( first_frame
) : -1;
118 // Get the real producer
119 mlt_producer real_producer
= mlt_properties_get_data( properties
, "producer", NULL
);
122 int strobe
= mlt_properties_get_int( properties
, "strobe");
123 int freeze
= mlt_properties_get_int( properties
, "freeze");
124 int freeze_after
= mlt_properties_get_int( properties
, "freeze_after");
125 int freeze_before
= mlt_properties_get_int( properties
, "freeze_before");
127 mlt_position need_first
;
129 if (!freeze
|| freeze_after
|| freeze_before
) {
130 double prod_speed
= mlt_properties_get_double( properties
, "_speed");
131 double actual_position
= prod_speed
* (double) mlt_producer_position( this );
133 if (mlt_properties_get_int( properties
, "reverse")) actual_position
= mlt_producer_get_playtime(this) - actual_position
;
137 need_first
= floor( actual_position
);
141 // Strobe effect wanted, calculate frame position
142 need_first
= floor( actual_position
);
143 need_first
-= need_first
%strobe
;
147 if (freeze_after
&& need_first
> freeze
) need_first
= freeze
;
148 else if (freeze_before
&& need_first
< freeze
) need_first
= freeze
;
151 else need_first
= freeze
;
153 if( need_first
!= first_position
)
155 mlt_frame_close( first_frame
);
160 if( first_frame
== NULL
)
162 // Seek the producer to the correct place
163 mlt_producer_seek( real_producer
, need_first
);
166 mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer
), &first_frame
, index
);
168 double ratio
= (double) mlt_properties_get_int( MLT_FRAME_PROPERTIES( first_frame
), "width" ) / (double) mlt_properties_get_int( MLT_FRAME_PROPERTIES( first_frame
), "height" ) / ( (double) mlt_properties_get_int(MLT_FRAME_PROPERTIES( *frame
), "width" ) / (double) mlt_properties_get_int( MLT_FRAME_PROPERTIES( *frame
), "height" ));
171 // Make sure things are in their place
172 mlt_properties_set_data( properties
, "first_frame", first_frame
, 0, NULL
, NULL
);
174 // Stack the producer and producer's get image
175 mlt_frame_push_service( *frame
, first_frame
);
176 mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( first_frame
) );
178 mlt_frame_push_service( *frame
, this );
179 mlt_frame_push_service( *frame
, framebuffer_get_image
);
182 // Give the returned frame temporal identity
183 mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
184 mlt_properties_set_double( MLT_FRAME_PROPERTIES(*frame
), "aspect_ratio", mlt_properties_get_double( properties
, "ratio_fix" ));
191 mlt_producer
producer_framebuffer_init( char *arg
)
194 mlt_producer
this = NULL
;
195 this = calloc( 1, sizeof( struct mlt_producer_s
) );
196 mlt_producer_init( this, NULL
);
199 mlt_producer real_producer
;
201 // Check if a speed was specified.
204 * Speed must be appended to the filename with ':'. To play your video at 50%:
205 inigo framebuffer:my_video.mpg:0.5
207 * Stroboscope effect can be obtained by adding a stobe=x parameter, where
208 x is the number of frames that will be ignored.
210 * You can play the movie backwards by adding reverse=1
212 * You can freeze the clip at a determined position by adding freeze=frame_pos
213 add freeze_after=1 to freeze only paste position or freeze_before to freeze before it
220 char *props
= strdup( arg
);
222 count
= strcspn( ptr
, ":" );
225 real_producer
= mlt_factory_producer( "fezzik", props
);
228 ptr
+= strspn( ptr
, ":" );
229 count
= strcspn( ptr
, ":" );
234 if (speed
== 0.0) speed
= 1.0;
237 if ( this != NULL
&& real_producer
!= NULL
)
239 // Get the properties of this producer
240 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
242 // Fezzik normalised it for us already
243 mlt_properties_set_int( properties
, "fezzik_normalised", 1);
245 // Store the producer and fitler
246 mlt_properties_set_data( properties
, "producer", real_producer
, 0, ( mlt_destructor
)mlt_producer_close
, NULL
);
248 // Grab some stuff from the real_producer
249 mlt_properties_pass_list( properties
, MLT_PRODUCER_PROPERTIES( real_producer
), "length,resource,width,height" );
254 double real_length
= (double) mlt_producer_get_length( real_producer
);
255 mlt_properties_set_position( properties
, "length", real_length
/ speed
);
258 // Since we control the seeking, prevent it from seeking on its own
259 mlt_producer_set_speed( real_producer
, 0 );
260 mlt_producer_set_speed( this, speed
);
262 // Override the get_frame method
263 this->get_frame
= producer_get_frame
;
268 mlt_producer_close( this );
270 mlt_producer_close( real_producer
);