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 <framework/mlt.h>
30 // Forward references.
31 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
33 /** Image stack(able) method
36 static int framebuffer_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
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 );
43 mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
45 // Frame properties objects
46 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( this );
47 mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
49 *width = mlt_properties_get_int( frame_properties, "width" );
50 *height = mlt_properties_get_int( frame_properties, "height" );
55 case mlt_image_yuv420p:
56 size = *width * 3 * ( *height + 1 ) / 2;
59 size = *width * ( *height + 1 ) * 3;
62 *format = mlt_image_yuv422;
63 size = *width * ( *height + 1 ) * 2;
67 uint8_t *output = mlt_properties_get_data( producer_properties, "output_buffer", NULL );
71 output = mlt_pool_alloc( size );
73 // Let someone else clean up
74 mlt_properties_set_data( producer_properties, "output_buffer", output, size, mlt_pool_release, NULL );
77 uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
79 // which frames are buffered?
83 if( first_image == NULL )
85 error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
88 fprintf(stderr, "first_image == NULL get image died\n");
93 // Start with a base image
94 memcpy( output, first_image, size );
97 mlt_properties_set_data( frame_properties, "image", output, size, NULL, NULL );
99 // Make sure that no further scaling is done
100 mlt_properties_set( frame_properties, "rescale.interps", "none" );
101 mlt_properties_set( frame_properties, "scale", "off" );
103 mlt_frame_close( first_frame );
108 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
110 // Construct a new frame
111 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
112 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
116 mlt_frame first_frame = mlt_properties_get_data( properties, "first_frame", NULL );
118 mlt_position first_position = (first_frame != NULL) ? mlt_frame_get_position( first_frame ) : -1;
120 // Get the real producer
121 mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
124 int strobe = mlt_properties_get_int( properties, "strobe");
125 int freeze = mlt_properties_get_int( properties, "freeze");
126 int freeze_after = mlt_properties_get_int( properties, "freeze_after");
127 int freeze_before = mlt_properties_get_int( properties, "freeze_before");
129 mlt_position need_first;
131 if (!freeze || freeze_after || freeze_before) {
132 double prod_speed = mlt_properties_get_double( properties, "_speed");
133 double actual_position = prod_speed * (double) mlt_producer_position( this );
135 if (mlt_properties_get_int( properties, "reverse")) actual_position = mlt_producer_get_playtime(this) - actual_position;
139 need_first = floor( actual_position );
143 // Strobe effect wanted, calculate frame position
144 need_first = floor( actual_position );
145 need_first -= need_first%strobe;
149 if (freeze_after && need_first > freeze) need_first = freeze;
150 else if (freeze_before && need_first < freeze) need_first = freeze;
153 else need_first = freeze;
155 if( need_first != first_position )
157 mlt_frame_close( first_frame );
162 if( first_frame == NULL )
164 // Seek the producer to the correct place
165 mlt_producer_seek( real_producer, need_first );
168 mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
170 double ratio = mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( real_producer ), "aspect_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" ));
172 mlt_properties_set_double( properties, "ratio_fix", ratio );
175 // Make sure things are in their place
176 mlt_properties_set_data( properties, "first_frame", first_frame, 0, NULL, NULL );
178 // Stack the producer and producer's get image
179 mlt_frame_push_service( *frame, first_frame );
180 mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( first_frame ) );
182 mlt_frame_push_service( *frame, this );
183 mlt_frame_push_service( *frame, framebuffer_get_image );
186 // Give the returned frame temporal identity
187 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
188 mlt_properties_set_double( MLT_FRAME_PROPERTIES(*frame), "aspect_ratio", mlt_properties_get_double( properties, "ratio_fix" ));
195 mlt_producer producer_framebuffer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
198 mlt_producer this = NULL;
199 this = calloc( 1, sizeof( struct mlt_producer_s ) );
200 mlt_producer_init( this, NULL );
203 mlt_producer real_producer;
205 // Check if a speed was specified.
208 * Speed must be appended to the filename with ':'. To play your video at 50%:
209 inigo framebuffer:my_video.mpg:0.5
211 * Stroboscope effect can be obtained by adding a stobe=x parameter, where
212 x is the number of frames that will be ignored.
214 * You can play the movie backwards by adding reverse=1
216 * You can freeze the clip at a determined position by adding freeze=frame_pos
217 add freeze_after=1 to freeze only paste position or freeze_before to freeze before it
224 char *props = strdup( arg );
226 count = strcspn( ptr, ":" );
229 real_producer = mlt_factory_producer( profile, "fezzik", props );
232 ptr += strspn( ptr, ":" );
233 count = strcspn( ptr, ":" );
238 if (speed == 0.0) speed = 1.0;
241 if ( this != NULL && real_producer != NULL)
243 // Get the properties of this producer
244 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
246 // Fezzik normalised it for us already
247 mlt_properties_set_int( properties, "fezzik_normalised", 1);
249 // Store the producer and fitler
250 mlt_properties_set_data( properties, "producer", real_producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
252 // Grab some stuff from the real_producer
253 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "length,resource,width,height" );
258 double real_length = (double) mlt_producer_get_length( real_producer );
259 mlt_properties_set_position( properties, "length", real_length / speed );
262 // Since we control the seeking, prevent it from seeking on its own
263 mlt_producer_set_speed( real_producer, 0 );
264 mlt_producer_set_speed( this, speed );
266 // Override the get_frame method
267 this->get_frame = producer_get_frame;
272 mlt_producer_close( this );
274 mlt_producer_close( real_producer );