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 int index = ( int )mlt_frame_pop_service( this );
42 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
44 // Frame properties objects
45 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( this );
46 mlt_frame first_frame = mlt_properties_get_data( properties, "first_frame", NULL );
48 // Get producer parameters
49 int strobe = mlt_properties_get_int( properties, "strobe" );
50 int freeze = mlt_properties_get_int( properties, "freeze" );
51 int freeze_after = mlt_properties_get_int( properties, "freeze_after" );
52 int freeze_before = mlt_properties_get_int( properties, "freeze_before" );
54 // Determine the position
55 mlt_position first_position = (first_frame != NULL) ? mlt_frame_get_position( first_frame ) : -1;
56 mlt_position need_first = freeze;
58 if ( !freeze || freeze_after || freeze_before )
60 double prod_speed = mlt_properties_get_double( properties, "_speed" );
61 double actual_position = prod_speed * (double) mlt_producer_position( producer );
63 if ( mlt_properties_get_int( properties, "reverse" ) )
64 actual_position = mlt_producer_get_playtime( producer ) - actual_position;
68 need_first = floor( actual_position );
72 // Strobe effect wanted, calculate frame position
73 need_first = floor( actual_position );
74 need_first -= need_first % strobe;
78 if ( freeze_after && need_first > freeze ) need_first = freeze;
79 else if ( freeze_before && need_first < freeze ) need_first = freeze;
83 // Determine output buffer size
84 *width = mlt_properties_get_int( frame_properties, "width" );
85 *height = mlt_properties_get_int( frame_properties, "height" );
90 case mlt_image_yuv420p:
91 size = *width * 3 * ( *height + 1 ) / 2;
94 size = *width * ( *height + 1 ) * 3;
96 case mlt_image_rgb24a:
97 case mlt_image_opengl:
98 size = *width * ( *height + 1 ) * 4;
101 *format = mlt_image_yuv422;
102 size = *width * ( *height + 1 ) * 2;
109 uint8_t *output = mlt_properties_get_data( properties, "output_buffer", &buffersize );
110 if( buffersize == 0 || buffersize != size)
112 // invalidate cached frame
116 if ( need_first != first_position )
118 // invalidate cached frame
121 // Bust the cached frame
122 mlt_properties_set_data( properties, "first_frame", NULL, 0, NULL, NULL );
126 if (output != NULL && first_position != -1) {
127 // Using the cached frame
128 uint8_t *image_copy = mlt_pool_alloc( size );
129 memcpy( image_copy, output, size );
131 // Set the output image
133 mlt_properties_set_data( frame_properties, "image", image_copy, size, ( mlt_destructor )mlt_pool_release, NULL );
135 // Make sure that no further scaling is done
136 mlt_properties_set( frame_properties, "rescale.interps", "none" );
137 mlt_properties_set( frame_properties, "scale", "off" );
141 // Get the cached frame
142 if ( first_frame == NULL )
144 // Get the frame to cache from the real producer
145 mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
147 // Seek the producer to the correct place
148 mlt_producer_seek( real_producer, need_first );
151 mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
154 mlt_properties_set_data( properties, "first_frame", first_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
156 mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
159 // Which frames are buffered?
160 uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
161 if( first_image == NULL )
163 mlt_properties_set_double( first_frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( frame_properties, "consumer_aspect_ratio" ) );
164 mlt_properties_set( first_frame_properties, "rescale.interp", mlt_properties_get( frame_properties, "rescale.interp" ) );
166 int error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
169 fprintf(stderr, "first_image == NULL get image died\n");
172 output = mlt_pool_alloc( size );
173 memcpy( output, first_image, size );
174 // Let someone else clean up
175 mlt_properties_set_data( properties, "output_buffer", output, size, mlt_pool_release, NULL );
180 uint8_t *image_copy = mlt_pool_alloc( size );
181 memcpy( image_copy, first_image, size );
183 // Set the output image
185 mlt_properties_set_data( frame_properties, "image", *image, size, ( mlt_destructor )mlt_pool_release, NULL );
187 // Make sure that no further scaling is done
188 mlt_properties_set( frame_properties, "rescale.interps", "none" );
189 mlt_properties_set( frame_properties, "scale", "off" );
194 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
196 // Construct a new frame
197 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
200 // Stack the producer and producer's get image
201 mlt_frame_push_service( *frame, (void*) index );
202 mlt_frame_push_service( *frame, this );
203 mlt_frame_push_service( *frame, framebuffer_get_image );
205 // Give the returned frame temporal identity
206 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
213 mlt_producer producer_framebuffer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
215 if ( !arg ) return NULL;
216 mlt_producer this = NULL;
217 this = calloc( 1, sizeof( struct mlt_producer_s ) );
218 mlt_producer_init( this, NULL );
221 mlt_producer real_producer;
223 // Check if a speed was specified.
226 * Speed must be appended to the filename with '?'. To play your video at 50%:
227 melt framebuffer:my_video.mpg?0.5
229 * Stroboscope effect can be obtained by adding a stobe=x parameter, where
230 x is the number of frames that will be ignored.
232 * You can play the movie backwards by adding reverse=1
234 * You can freeze the clip at a determined position by adding freeze=frame_pos
235 add freeze_after=1 to freeze only paste position or freeze_before to freeze before it
240 char *props = strdup( arg );
241 char *ptr = strrchr( props, '?' );
245 speed = atof( ptr + 1 );
247 // If speed was valid, then strip it and the delimiter.
248 // Otherwise, an invalid speed probably means this '?' was not a delimiter.
252 real_producer = mlt_factory_producer( profile, NULL, props );
255 if (speed == 0.0) speed = 1.0;
257 if ( this != NULL && real_producer != NULL)
259 // Get the properties of this producer
260 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
262 mlt_properties_set( properties, "resource", arg);
264 // Store the producer and fitler
265 mlt_properties_set_data( properties, "producer", real_producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
267 // Grab some stuff from the real_producer
268 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "length, width,height" );
273 mlt_properties_set_int( properties, "reverse", 1 );
278 double real_length = ( (double) mlt_producer_get_length( real_producer ) ) / speed;
279 mlt_properties_set_position( properties, "length", real_length );
281 mlt_properties_set_position( properties, "out", mlt_producer_get_length( this ) - 1 );
283 // Since we control the seeking, prevent it from seeking on its own
284 mlt_producer_set_speed( real_producer, 0 );
285 mlt_producer_set_speed( this, speed );
287 // Override the get_frame method
288 this->get_frame = producer_get_frame;
293 mlt_producer_close( this );
295 mlt_producer_close( real_producer );