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 mlt_service_lock( MLT_PRODUCER_SERVICE( producer ) );
46 // Frame properties objects
47 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( this );
48 mlt_frame first_frame = mlt_properties_get_data( properties, "first_frame", NULL );
50 // Get producer parameters
51 int strobe = mlt_properties_get_int( properties, "strobe" );
52 int freeze = mlt_properties_get_int( properties, "freeze" );
53 int freeze_after = mlt_properties_get_int( properties, "freeze_after" );
54 int freeze_before = mlt_properties_get_int( properties, "freeze_before" );
56 // Determine the position
57 mlt_position first_position = (first_frame != NULL) ? mlt_frame_get_position( first_frame ) : -1;
58 mlt_position need_first = freeze;
60 if ( !freeze || freeze_after || freeze_before )
62 double prod_speed = mlt_properties_get_double( properties, "_speed" );
63 double actual_position = prod_speed * (double) mlt_producer_position( producer );
65 if ( mlt_properties_get_int( properties, "reverse" ) )
66 actual_position = mlt_producer_get_playtime( producer ) - actual_position;
70 need_first = floor( actual_position );
74 // Strobe effect wanted, calculate frame position
75 need_first = floor( actual_position );
76 need_first -= need_first % strobe;
80 if ( freeze_after && need_first > freeze ) need_first = freeze;
81 else if ( freeze_before && need_first < freeze ) need_first = freeze;
85 // Determine output buffer size
86 *width = mlt_properties_get_int( frame_properties, "width" );
87 *height = mlt_properties_get_int( frame_properties, "height" );
88 int size = mlt_image_format_size( *format, *width, *height, NULL );
92 uint8_t *output = mlt_properties_get_data( properties, "output_buffer", &buffersize );
93 if( buffersize == 0 || buffersize != size)
95 // invalidate cached frame
99 if ( need_first != first_position )
101 // invalidate cached frame
104 // Bust the cached frame
105 mlt_properties_set_data( properties, "first_frame", NULL, 0, NULL, NULL );
109 if (output != NULL && first_position != -1) {
110 // Using the cached frame
111 uint8_t *image_copy = mlt_pool_alloc( size );
112 memcpy( image_copy, output, size );
114 // Set the output image
116 mlt_frame_set_image( this, image_copy, size, mlt_pool_release );
118 *width = mlt_properties_get_int( properties, "_output_width" );
119 *height = mlt_properties_get_int( properties, "_output_height" );
120 *format = mlt_properties_get_int( properties, "_output_format" );
122 mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
126 // Get the cached frame
127 if ( first_frame == NULL )
129 // Get the frame to cache from the real producer
130 mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
132 // Seek the producer to the correct place
133 mlt_producer_seek( real_producer, need_first );
136 mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
139 mlt_properties_set_data( properties, "first_frame", first_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
141 mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
144 // Which frames are buffered?
145 uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
146 if( first_image == NULL )
148 mlt_properties_set_double( first_frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( frame_properties, "consumer_aspect_ratio" ) );
149 mlt_properties_set( first_frame_properties, "rescale.interp", mlt_properties_get( frame_properties, "rescale.interp" ) );
151 int error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
154 mlt_log_error( MLT_PRODUCER_SERVICE( producer ), "first_image == NULL get image died\n" );
155 mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
158 output = mlt_pool_alloc( size );
159 memcpy( output, first_image, size );
160 // Let someone else clean up
161 mlt_properties_set_data( properties, "output_buffer", output, size, mlt_pool_release, NULL );
162 mlt_properties_set_int( properties, "_output_width", *width );
163 mlt_properties_set_int( properties, "_output_height", *height );
164 mlt_properties_set_int( properties, "_output_format", *format );
167 mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
170 uint8_t *image_copy = mlt_pool_alloc( size );
171 memcpy( image_copy, first_image, size );
173 // Set the output image
175 mlt_frame_set_image( this, *image, size, mlt_pool_release );
180 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
182 // Construct a new frame
183 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
186 // Stack the producer and producer's get image
187 mlt_frame_push_service( *frame, (void*) index );
188 mlt_frame_push_service( *frame, this );
189 mlt_frame_push_service( *frame, framebuffer_get_image );
191 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
192 mlt_properties frame_properties = MLT_FRAME_PROPERTIES(*frame);
194 double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
195 if ( force_aspect_ratio <= 0.0 ) force_aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
196 mlt_properties_set_double( frame_properties, "aspect_ratio", force_aspect_ratio );
198 // Give the returned frame temporal identity
199 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
201 mlt_properties_set_int( frame_properties, "real_width", mlt_properties_get_int( properties, "width" ) );
202 mlt_properties_set_int( frame_properties, "real_height", mlt_properties_get_int( properties, "height" ) );
203 mlt_properties_pass_list( frame_properties, properties, "width, height" );
210 mlt_producer producer_framebuffer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
212 if ( !arg ) return NULL;
213 mlt_producer this = NULL;
214 this = calloc( 1, sizeof( struct mlt_producer_s ) );
215 mlt_producer_init( this, NULL );
218 mlt_producer real_producer;
220 // Check if a speed was specified.
223 * Speed must be appended to the filename with '?'. To play your video at 50%:
224 melt framebuffer:my_video.mpg?0.5
226 * Stroboscope effect can be obtained by adding a stobe=x parameter, where
227 x is the number of frames that will be ignored.
229 * You can play the movie backwards by adding reverse=1
231 * You can freeze the clip at a determined position by adding freeze=frame_pos
232 add freeze_after=1 to freeze only paste position or freeze_before to freeze before it
237 char *props = strdup( arg );
238 char *ptr = strrchr( props, '?' );
242 speed = atof( ptr + 1 );
244 // If speed was valid, then strip it and the delimiter.
245 // Otherwise, an invalid speed probably means this '?' was not a delimiter.
249 real_producer = mlt_factory_producer( profile, "abnormal", props );
252 if (speed == 0.0) speed = 1.0;
254 if ( this != NULL && real_producer != NULL)
256 // Get the properties of this producer
257 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
259 mlt_properties_set( properties, "resource", arg);
261 // Store the producer and fitler
262 mlt_properties_set_data( properties, "producer", real_producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
264 // Grab some stuff from the real_producer
265 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "length, width, height, aspect_ratio" );
270 mlt_properties_set_int( properties, "reverse", 1 );
275 double real_length = ( (double) mlt_producer_get_length( real_producer ) ) / speed;
276 mlt_properties_set_position( properties, "length", real_length );
278 mlt_properties_set_position( properties, "out", mlt_producer_get_length( this ) - 1 );
280 // Since we control the seeking, prevent it from seeking on its own
281 mlt_producer_set_speed( real_producer, 0 );
282 mlt_producer_set_speed( this, speed );
284 // Override the get_frame method
285 this->get_frame = producer_get_frame;
290 mlt_producer_close( this );
292 mlt_producer_close( real_producer );