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" );
92 case mlt_image_yuv420p:
93 size = *width * 3 * ( *height + 1 ) / 2;
96 size = *width * ( *height + 1 ) * 3;
98 case mlt_image_rgb24a:
99 case mlt_image_opengl:
100 size = *width * ( *height + 1 ) * 4;
103 *format = mlt_image_yuv422;
104 size = *width * ( *height + 1 ) * 2;
111 uint8_t *output = mlt_properties_get_data( properties, "output_buffer", &buffersize );
112 if( buffersize == 0 || buffersize != size)
114 // invalidate cached frame
118 if ( need_first != first_position )
120 // invalidate cached frame
123 // Bust the cached frame
124 mlt_properties_set_data( properties, "first_frame", NULL, 0, NULL, NULL );
128 if (output != NULL && first_position != -1) {
129 // Using the cached frame
130 uint8_t *image_copy = mlt_pool_alloc( size );
131 memcpy( image_copy, output, size );
133 // Set the output image
135 mlt_properties_set_data( frame_properties, "image", image_copy, size, ( mlt_destructor )mlt_pool_release, NULL );
137 *width = mlt_properties_get_int( properties, "_output_width" );
138 *height = mlt_properties_get_int( properties, "_output_height" );
139 *format = mlt_properties_get_int( properties, "_output_format" );
141 mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
145 // Get the cached frame
146 if ( first_frame == NULL )
148 // Get the frame to cache from the real producer
149 mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
151 // Seek the producer to the correct place
152 mlt_producer_seek( real_producer, need_first );
155 mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
158 mlt_properties_set_data( properties, "first_frame", first_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
160 mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
163 // Which frames are buffered?
164 uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
165 if( first_image == NULL )
167 mlt_properties_set_double( first_frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( frame_properties, "consumer_aspect_ratio" ) );
168 mlt_properties_set( first_frame_properties, "rescale.interp", mlt_properties_get( frame_properties, "rescale.interp" ) );
170 int error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
173 mlt_log_error( MLT_PRODUCER_SERVICE( producer ), "first_image == NULL get image died\n" );
174 mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
177 output = mlt_pool_alloc( size );
178 memcpy( output, first_image, size );
179 // Let someone else clean up
180 mlt_properties_set_data( properties, "output_buffer", output, size, mlt_pool_release, NULL );
181 mlt_properties_set_int( properties, "_output_width", *width );
182 mlt_properties_set_int( properties, "_output_height", *height );
183 mlt_properties_set_int( properties, "_output_format", *format );
186 mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
189 uint8_t *image_copy = mlt_pool_alloc( size );
190 memcpy( image_copy, first_image, size );
192 // Set the output image
194 mlt_properties_set_data( frame_properties, "image", *image, size, ( mlt_destructor )mlt_pool_release, NULL );
199 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
201 // Construct a new frame
202 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
205 // Stack the producer and producer's get image
206 mlt_frame_push_service( *frame, (void*) index );
207 mlt_frame_push_service( *frame, this );
208 mlt_frame_push_service( *frame, framebuffer_get_image );
210 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
211 mlt_properties frame_properties = MLT_FRAME_PROPERTIES(*frame);
213 double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
214 if ( force_aspect_ratio <= 0.0 ) force_aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
215 mlt_properties_set_double( frame_properties, "aspect_ratio", force_aspect_ratio );
217 // Give the returned frame temporal identity
218 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
220 mlt_properties_set_int( frame_properties, "real_width", mlt_properties_get_int( properties, "width" ) );
221 mlt_properties_set_int( frame_properties, "real_height", mlt_properties_get_int( properties, "height" ) );
222 mlt_properties_pass_list( frame_properties, properties, "width, height" );
229 mlt_producer producer_framebuffer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
231 if ( !arg ) return NULL;
232 mlt_producer this = NULL;
233 this = calloc( 1, sizeof( struct mlt_producer_s ) );
234 mlt_producer_init( this, NULL );
237 mlt_producer real_producer;
239 // Check if a speed was specified.
242 * Speed must be appended to the filename with '?'. To play your video at 50%:
243 melt framebuffer:my_video.mpg?0.5
245 * Stroboscope effect can be obtained by adding a stobe=x parameter, where
246 x is the number of frames that will be ignored.
248 * You can play the movie backwards by adding reverse=1
250 * You can freeze the clip at a determined position by adding freeze=frame_pos
251 add freeze_after=1 to freeze only paste position or freeze_before to freeze before it
256 char *props = strdup( arg );
257 char *ptr = strrchr( props, '?' );
261 speed = atof( ptr + 1 );
263 // If speed was valid, then strip it and the delimiter.
264 // Otherwise, an invalid speed probably means this '?' was not a delimiter.
268 real_producer = mlt_factory_producer( profile, "abnormal", props );
271 if (speed == 0.0) speed = 1.0;
273 if ( this != NULL && real_producer != NULL)
275 // Get the properties of this producer
276 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
278 mlt_properties_set( properties, "resource", arg);
280 // Store the producer and fitler
281 mlt_properties_set_data( properties, "producer", real_producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
283 // Grab some stuff from the real_producer
284 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "length, width, height, aspect_ratio" );
289 mlt_properties_set_int( properties, "reverse", 1 );
294 double real_length = ( (double) mlt_producer_get_length( real_producer ) ) / speed;
295 mlt_properties_set_position( properties, "length", real_length );
297 mlt_properties_set_position( properties, "out", mlt_producer_get_length( this ) - 1 );
299 // Since we control the seeking, prevent it from seeking on its own
300 mlt_producer_set_speed( real_producer, 0 );
301 mlt_producer_set_speed( this, speed );
303 // Override the get_frame method
304 this->get_frame = producer_get_frame;
309 mlt_producer_close( this );
311 mlt_producer_close( real_producer );