git.sesse.net Git - mlt/blob - src/modules/kdenlive/producer_framebuffer.c

   1 /*
   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
   5  *
   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.
  10  *
  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.
  15  *
  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
  19  */
  20
  21 #include <framework/mlt.h>
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <math.h>
  26 #include <string.h>
  27 #include <sys/time.h>
  28 #include <assert.h>
  29
  30 // Forward references.
  31 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  32
  33 /** Image stack(able) method
  34 */
  35
  36 static int framebuffer_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  37 {
  38
  39         // Get the filter object and properties
  40         mlt_producer producer = mlt_frame_pop_service( frame );
  41         int index = ( int )mlt_frame_pop_service( frame );
  42         mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
  43
  44         mlt_service_lock( MLT_PRODUCER_SERVICE( producer ) );
  45
  46         // Frame properties objects
  47         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
  48         mlt_frame first_frame = mlt_properties_get_data( properties, "first_frame", NULL );
  49
  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" );
  55
  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;
  59
  60         if ( !freeze || freeze_after || freeze_before )
  61         {
  62                 double prod_speed = mlt_properties_get_double( properties, "_speed" );
  63                 double actual_position = prod_speed * (double) mlt_producer_position( producer );
  64
  65                 if ( mlt_properties_get_int( properties, "reverse" ) )
  66                         actual_position = mlt_producer_get_playtime( producer ) - actual_position;
  67
  68                 if ( strobe < 2 )
  69                 {
  70                         need_first = floor( actual_position );
  71                 }
  72                 else
  73                 {
  74                         // Strobe effect wanted, calculate frame position
  75                         need_first = floor( actual_position );
  76                         need_first -= need_first % strobe;
  77                 }
  78                 if ( freeze )
  79                 {
  80                         if ( freeze_after && need_first > freeze ) need_first = freeze;
  81                         else if ( freeze_before && need_first < freeze ) need_first = freeze;
  82                 }
  83         }
  84
  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 );
  89
  90         // Get output buffer
  91         int buffersize = 0;
  92         uint8_t *output = mlt_properties_get_data( properties, "output_buffer", &buffersize );
  93         if( buffersize == 0 || buffersize != size)
  94         {
  95                 // invalidate cached frame
  96                 first_position = -1;
  97         }
  98
  99         if ( need_first != first_position )
 100         {
 101                 // invalidate cached frame
 102                 first_position = -1;
 103
 104                 // Bust the cached frame
 105                 mlt_properties_set_data( properties, "first_frame", NULL, 0, NULL, NULL );
 106                 first_frame = NULL;
 107         }
 108
 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 );
 113
 114                 // Set the output image
 115                 *image = image_copy;
 116                 mlt_frame_set_image( frame, image_copy, size, mlt_pool_release );
 117
 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" );
 121
 122                 mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
 123                 return 0;
 124         }
 125
 126         // Get the cached frame
 127         if ( first_frame == NULL )
 128         {
 129                 // Get the frame to cache from the real producer
 130                 mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
 131
 132                 // Seek the producer to the correct place
 133                 mlt_producer_seek( real_producer, need_first );
 134
 135                 // Get the frame
 136                 mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
 137
 138                 // Cache the frame
 139                 mlt_properties_set_data( properties, "first_frame", first_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
 140         }
 141         mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
 142
 143
 144         // Which frames are buffered?
 145         uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
 146         if( first_image == NULL )
 147         {
 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" ) );
 150
 151                 int error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
 152
 153                 if ( error != 0 ) {
 154                         mlt_log_error( MLT_PRODUCER_SERVICE( producer ), "first_image == NULL get image died\n" );
 155                         mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
 156                         return error;
 157                 }
 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 );
 165
 166         }
 167         mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
 168
 169         // Create a copy
 170         uint8_t *image_copy = mlt_pool_alloc( size );
 171         memcpy( image_copy, first_image, size );
 172
 173         // Set the output image
 174         *image = image_copy;
 175         mlt_frame_set_image( frame, *image, size, mlt_pool_release );
 176
 177         return 0;
 178 }
 179
 180 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 181 {
 182         // Construct a new frame
 183         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 184         if( frame != NULL )
 185         {
 186                 // Stack the producer and producer's get image
 187                 mlt_frame_push_service( *frame, (void*) index );
 188                 mlt_frame_push_service( *frame, producer );
 189                 mlt_frame_push_service( *frame, framebuffer_get_image );
 190
 191                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
 192                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES(*frame);
 193
 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 );
 197
 198                 // Give the returned frame temporal identity
 199                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 200
 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" );
 204         }
 205
 206         return 0;
 207 }
 208
 209
 210 mlt_producer producer_framebuffer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 211 {
 212         if ( !arg ) return NULL;
 213         mlt_producer producer = NULL;
 214         producer = calloc( 1, sizeof( struct mlt_producer_s ) );
 215         mlt_producer_init( producer, NULL );
 216
 217         // Wrap loader
 218         mlt_producer real_producer;
 219
 220         // Check if a speed was specified.
 221         /**
 222
 223         * Speed must be appended to the filename with '?'. To play your video at 50%:
 224          melt framebuffer:my_video.mpg?0.5
 225
 226         * Stroboscope effect can be obtained by adding a stobe=x parameter, where
 227          x is the number of frames that will be ignored.
 228
 229         * You can play the movie backwards by adding reverse=1
 230
 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
 233
 234         **/
 235
 236         double speed = 0.0;
 237         char *props = strdup( arg );
 238         char *ptr = strrchr( props, '?' );
 239
 240         if ( ptr )
 241         {
 242                 speed = atof( ptr + 1 );
 243                 if ( speed != 0.0 )
 244                         // If speed was valid, then strip it and the delimiter.
 245                         // Otherwise, an invalid speed probably means this '?' was not a delimiter.
 246                         *ptr = '\0';
 247         }
 248
 249         real_producer = mlt_factory_producer( profile, "abnormal", props );
 250         free( props );
 251
 252         if (speed == 0.0) speed = 1.0;
 253
 254         if ( producer != NULL && real_producer != NULL)
 255         {
 256                 // Get the properties of this producer
 257                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
 258
 259                 mlt_properties_set( properties, "resource", arg);
 260
 261                 // Store the producer and fitler
 262                 mlt_properties_set_data( properties, "producer", real_producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 263
 264                 // Grab some stuff from the real_producer
 265                 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "length, width, height, aspect_ratio" );
 266
 267                 if ( speed < 0 )
 268                 {
 269                         speed = -speed;
 270                         mlt_properties_set_int( properties, "reverse", 1 );
 271                 }
 272
 273                 if ( speed != 1.0 )
 274                 {
 275                         double real_length = ( (double)  mlt_producer_get_length( real_producer ) ) / speed;
 276                         mlt_properties_set_position( properties, "length", real_length );
 277                 }
 278                 mlt_properties_set_position( properties, "out", mlt_producer_get_length( producer ) - 1 );
 279
 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( producer, speed );
 283
 284                 // Override the get_frame method
 285                 producer->get_frame = producer_get_frame;
 286         }
 287         else
 288         {
 289                 if ( producer )
 290                         mlt_producer_close( producer );
 291                 if ( real_producer )
 292                         mlt_producer_close( real_producer );
 293
 294                 producer = NULL;
 295         }
 296         return producer;
 297 }