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 if ( need_first != first_position )
85 // Bust the cached frame
87 mlt_properties_set_data( properties, "first_frame", NULL, 0, NULL, NULL );
90 // Get the cached frame
91 if ( first_frame == NULL )
93 // Get the frame to cache from the real producer
94 mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
96 // Seek the producer to the correct place
97 mlt_producer_seek( real_producer, need_first );
100 mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
103 mlt_properties_set_data( properties, "first_frame", first_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
105 mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
107 // Determine output buffer size
108 *width = mlt_properties_get_int( frame_properties, "width" );
109 *height = mlt_properties_get_int( frame_properties, "height" );
113 case mlt_image_yuv420p:
114 size = *width * 3 * ( *height + 1 ) / 2;
116 case mlt_image_rgb24:
117 size = *width * ( *height + 1 ) * 3;
120 *format = mlt_image_yuv422;
121 size = *width * ( *height + 1 ) * 2;
126 uint8_t *output = mlt_properties_get_data( properties, "output_buffer", NULL );
129 output = mlt_pool_alloc( size );
131 // Let someone else clean up
132 mlt_properties_set_data( properties, "output_buffer", output, size, mlt_pool_release, NULL );
135 // Which frames are buffered?
136 uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
137 if( first_image == NULL )
139 mlt_properties props = MLT_FRAME_PROPERTIES( this );
140 mlt_properties test_properties = MLT_FRAME_PROPERTIES( first_frame );
141 mlt_properties_set_double( test_properties, "consumer_aspect_ratio", mlt_properties_get_double( props, "consumer_aspect_ratio" ) );
142 mlt_properties_set( test_properties, "rescale.interp", mlt_properties_get( props, "rescale.interp" ) );
144 int error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
147 fprintf(stderr, "first_image == NULL get image died\n");
152 // Start with a base image
153 memcpy( output, first_image, size );
155 // Set the output image
157 mlt_properties_set_data( frame_properties, "image", output, size, NULL, NULL );
159 // Make sure that no further scaling is done
160 mlt_properties_set( frame_properties, "rescale.interps", "none" );
161 mlt_properties_set( frame_properties, "scale", "off" );
166 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
168 // Construct a new frame
169 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
172 // Stack the producer and producer's get image
173 mlt_frame_push_service( *frame, (void*) index );
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 ) );
185 mlt_producer producer_framebuffer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
187 if ( !arg ) return NULL;
188 mlt_producer this = NULL;
189 this = calloc( 1, sizeof( struct mlt_producer_s ) );
190 mlt_producer_init( this, NULL );
193 mlt_producer real_producer;
195 // Check if a speed was specified.
198 * Speed must be appended to the filename with '?'. To play your video at 50%:
199 melt framebuffer:my_video.mpg?0.5
201 * Stroboscope effect can be obtained by adding a stobe=x parameter, where
202 x is the number of frames that will be ignored.
204 * You can play the movie backwards by adding reverse=1
206 * You can freeze the clip at a determined position by adding freeze=frame_pos
207 add freeze_after=1 to freeze only paste position or freeze_before to freeze before it
212 char *props = strdup( arg );
213 char *ptr = strrchr( props, '?' );
217 speed = atof( ptr + 1 );
219 // If speed was valid, then strip it and the delimiter.
220 // Otherwise, an invalid speed probably means this '?' was not a delimiter.
224 real_producer = mlt_factory_producer( profile, NULL, props );
227 if (speed == 0.0) speed = 1.0;
229 if ( this != NULL && real_producer != NULL)
231 // Get the properties of this producer
232 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
234 // The loader normalised it for us already
235 mlt_properties_set_int( properties, "loader_normalised", 1);
236 mlt_properties_set( properties, "resource", arg);
238 // Store the producer and fitler
239 mlt_properties_set_data( properties, "producer", real_producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
241 // Grab some stuff from the real_producer
242 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "length, width,height" );
247 mlt_properties_set_int( properties, "reverse", 1 );
252 double real_length = ( (double) mlt_producer_get_length( real_producer ) ) / speed;
253 mlt_properties_set_position( properties, "length", real_length );
255 mlt_properties_set_position( properties, "out", mlt_producer_get_length( this ) - 1 );
257 // Since we control the seeking, prevent it from seeking on its own
258 mlt_producer_set_speed( real_producer, 0 );
259 mlt_producer_set_speed( this, speed );
261 // Override the get_frame method
262 this->get_frame = producer_get_frame;
267 mlt_producer_close( this );
269 mlt_producer_close( real_producer );