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         int in = mlt_properties_get_position( properties, "in" );
  56
  57         // Determine the position
  58         mlt_position first_position = (first_frame != NULL) ? mlt_frame_get_position( first_frame ) : -1;
  59         mlt_position need_first = freeze;
  60
  61         if ( !freeze || freeze_after || freeze_before )
  62         {
  63                 double prod_speed = mlt_properties_get_double( properties, "_speed" );
  64                 double actual_position = in + prod_speed * (double) mlt_producer_position( producer );
  65
  66                 if ( mlt_properties_get_int( properties, "reverse" ) )
  67                         actual_position = mlt_producer_get_playtime( producer ) - actual_position;
  68
  69                 if ( strobe < 2 )
  70                 {
  71                         need_first = floor( actual_position );
  72                 }
  73                 else
  74                 {
  75                         // Strobe effect wanted, calculate frame position
  76                         need_first = floor( actual_position );
  77                         need_first -= need_first % strobe;
  78                 }
  79                 if ( freeze )
  80                 {
  81                         if ( freeze_after && need_first > freeze ) need_first = freeze;
  82                         else if ( freeze_before && need_first < freeze ) need_first = freeze;
  83                 }
  84         }
  85
  86         // Determine output buffer size
  87         *width = mlt_properties_get_int( frame_properties, "width" );
  88         *height = mlt_properties_get_int( frame_properties, "height" );
  89         int size = mlt_image_format_size( *format, *width, *height, NULL );
  90
  91         // Get output buffer
  92         int buffersize = 0;
  93         int alphasize = *width * *height;
  94         uint8_t *output = mlt_properties_get_data( properties, "output_buffer", &buffersize );
  95         uint8_t *output_alpha = mlt_properties_get_data( properties, "output_alpha", NULL );
  96         if( buffersize == 0 || buffersize != size )
  97         {
  98                 // invalidate cached frame
  99                 first_position = -1;
 100         }
 101
 102         if ( need_first != first_position )
 103         {
 104                 // invalidate cached frame
 105                 first_position = -1;
 106
 107                 // Bust the cached frame
 108                 mlt_properties_set_data( properties, "first_frame", NULL, 0, NULL, NULL );
 109                 first_frame = NULL;
 110         }
 111
 112         if ( output && first_position != -1 ) {
 113                 // Using the cached frame
 114                 uint8_t *image_copy = mlt_pool_alloc( size );
 115                 memcpy( image_copy, output, size );
 116                 uint8_t *alpha_copy = mlt_pool_alloc( alphasize );
 117                 memcpy( alpha_copy, output_alpha, alphasize );
 118
 119                 // Set the output image
 120                 *image = image_copy;
 121                 mlt_frame_set_image( frame, image_copy, size, mlt_pool_release );
 122                 mlt_frame_set_alpha( frame, alpha_copy, alphasize, mlt_pool_release );
 123
 124                 *width = mlt_properties_get_int( properties, "_output_width" );
 125                 *height = mlt_properties_get_int( properties, "_output_height" );
 126                 *format = mlt_properties_get_int( properties, "_output_format" );
 127
 128                 mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
 129                 return 0;
 130         }
 131
 132         // Get the cached frame
 133         if ( first_frame == NULL )
 134         {
 135                 // Get the frame to cache from the real producer
 136                 mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
 137
 138                 // Seek the producer to the correct place
 139                 mlt_producer_seek( real_producer, need_first );
 140
 141                 // Get the frame
 142                 mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
 143
 144                 // Cache the frame
 145                 mlt_properties_set_data( properties, "first_frame", first_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
 146         }
 147         mlt_properties first_frame_properties = MLT_FRAME_PROPERTIES( first_frame );
 148
 149
 150         // Which frames are buffered?
 151         uint8_t *first_image = mlt_properties_get_data( first_frame_properties, "image", NULL );
 152         uint8_t *first_alpha = mlt_properties_get_data( first_frame_properties, "alpha", NULL );
 153         if ( !first_image )
 154         {
 155                 mlt_properties_set( first_frame_properties, "rescale.interp", mlt_properties_get( frame_properties, "rescale.interp" ) );
 156
 157                 int error = mlt_frame_get_image( first_frame, &first_image, format, width, height, writable );
 158
 159                 if ( error != 0 ) {
 160                         mlt_log_error( MLT_PRODUCER_SERVICE( producer ), "first_image == NULL get image died\n" );
 161                         mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
 162                         return error;
 163                 }
 164                 output = mlt_pool_alloc( size );
 165                 memcpy( output, first_image, size );
 166                 // Let someone else clean up
 167                 mlt_properties_set_data( properties, "output_buffer", output, size, mlt_pool_release, NULL );
 168                 mlt_properties_set_int( properties, "_output_width", *width );
 169                 mlt_properties_set_int( properties, "_output_height", *height );
 170                 mlt_properties_set_int( properties, "_output_format", *format );
 171
 172         }
 173
 174         if ( !first_alpha )
 175         {
 176                 alphasize = *width * *height;
 177                 first_alpha = mlt_frame_get_alpha_mask( first_frame );
 178                 output_alpha = mlt_pool_alloc( alphasize );
 179                 memcpy( output_alpha, first_alpha, alphasize );
 180                 mlt_properties_set_data( properties, "output_alpha", output_alpha, alphasize, mlt_pool_release, NULL );
 181         }
 182
 183         mlt_service_unlock( MLT_PRODUCER_SERVICE( producer ) );
 184
 185         // Create a copy
 186         uint8_t *image_copy = mlt_pool_alloc( size );
 187         memcpy( image_copy, first_image, size );
 188         uint8_t *alpha_copy = mlt_pool_alloc( alphasize );
 189         memcpy( alpha_copy, first_alpha, alphasize );
 190
 191         // Set the output image
 192         *image = image_copy;
 193         mlt_frame_set_image( frame, *image, size, mlt_pool_release );
 194
 195         mlt_frame_set_alpha( frame, alpha_copy, alphasize, mlt_pool_release );
 196
 197         return 0;
 198 }
 199
 200 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 201 {
 202         if ( frame )
 203         {
 204                 // Construct a new frame
 205                 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 206
 207                 // Stack the producer and producer's get image
 208                 mlt_frame_push_service( *frame, (void*) index );
 209                 mlt_frame_push_service( *frame, producer );
 210                 mlt_frame_push_service( *frame, framebuffer_get_image );
 211
 212                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
 213                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES(*frame);
 214
 215                 // Get frame from the real producer
 216                 mlt_frame first_frame = mlt_properties_get_data( properties, "first_frame", NULL );
 217
 218                 if ( first_frame == NULL )
 219                 {
 220                     // Get the frame to cache from the real producer
 221                     mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );
 222
 223                     // Seek the producer to the correct place
 224                     mlt_producer_seek( real_producer, mlt_producer_position( producer ) );
 225
 226                     // Get the frame
 227                     mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
 228                     // Cache the frame
 229                     mlt_properties_set_data( properties, "first_frame", first_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
 230                 }
 231
 232                 mlt_properties_inherit( frame_properties, MLT_FRAME_PROPERTIES(first_frame) );
 233
 234                 double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
 235                 if ( force_aspect_ratio <= 0.0 ) force_aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
 236                 mlt_properties_set_double( frame_properties, "aspect_ratio", force_aspect_ratio );
 237
 238                 // Give the returned frame temporal identity
 239                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 240
 241                 mlt_properties_set_int( frame_properties, "meta.media.width", mlt_properties_get_int( properties, "width" ) );
 242                 mlt_properties_set_int( frame_properties, "meta.media.height", mlt_properties_get_int( properties, "height" ) );
 243                 mlt_properties_pass_list( frame_properties, properties, "width, height" );
 244         }
 245
 246         return 0;
 247 }
 248
 249
 250 mlt_producer producer_framebuffer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 251 {
 252         if ( !arg ) return NULL;
 253         mlt_producer producer = NULL;
 254         producer = calloc( 1, sizeof( struct mlt_producer_s ) );
 255         if ( !producer )
 256                 return NULL;
 257
 258         if ( mlt_producer_init( producer, NULL ) )
 259         {
 260                 free( producer );
 261                 return NULL;
 262         }
 263
 264         // Wrap loader
 265         mlt_producer real_producer;
 266
 267         // Check if a speed was specified.
 268         /**
 269
 270         * Speed must be appended to the filename with '?'. To play your video at 50%:
 271          melt framebuffer:my_video.mpg?0.5
 272
 273         * Stroboscope effect can be obtained by adding a stobe=x parameter, where
 274          x is the number of frames that will be ignored.
 275
 276         * You can play the movie backwards by adding reverse=1
 277
 278         * You can freeze the clip at a determined position by adding freeze=frame_pos
 279           add freeze_after=1 to freeze only paste position or freeze_before to freeze before it
 280
 281         **/
 282
 283         double speed = 0.0;
 284         char *props = strdup( arg );
 285         char *ptr = strrchr( props, '?' );
 286
 287         if ( ptr )
 288         {
 289                 speed = atof( ptr + 1 );
 290                 if ( speed != 0.0 )
 291                         // If speed was valid, then strip it and the delimiter.
 292                         // Otherwise, an invalid speed probably means this '?' was not a delimiter.
 293                         *ptr = '\0';
 294         }
 295
 296         real_producer = mlt_factory_producer( profile, "abnormal", props );
 297         free( props );
 298
 299         if (speed == 0.0) speed = 1.0;
 300
 301         if ( producer != NULL && real_producer != NULL)
 302         {
 303                 // Get the properties of this producer
 304                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
 305
 306                 mlt_properties_set( properties, "resource", arg);
 307
 308                 // Store the producer and fitler
 309                 mlt_properties_set_data( properties, "producer", real_producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 310
 311                 // Grab some stuff from the real_producer
 312                 mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "length, width, height, aspect_ratio" );
 313
 314                 if ( speed < 0 )
 315                 {
 316                         speed = -speed;
 317                         mlt_properties_set_int( properties, "reverse", 1 );
 318                 }
 319
 320                 if ( speed != 1.0 )
 321                 {
 322                         double real_length = ( (double)  mlt_producer_get_length( real_producer ) ) / speed;
 323                         mlt_properties_set_position( properties, "length", real_length );
 324                         mlt_properties real_properties = MLT_PRODUCER_PROPERTIES( real_producer );
 325                         const char* service = mlt_properties_get( real_properties, "mlt_service" );
 326                         if ( service && !strcmp( service, "avformat" ) )
 327                         {
 328                                 int n = mlt_properties_count( real_properties );
 329                                 int i;
 330                                 for ( i = 0; i < n; i++ )
 331                                 {
 332                                         if ( strstr( mlt_properties_get_name( real_properties, i ), "stream.frame_rate" ) )
 333                                         {
 334                                                 double source_fps = mlt_properties_get_double( real_properties, mlt_properties_get_name( real_properties, i ) );
 335                                                 if ( source_fps > mlt_profile_fps( profile ) )
 336                                                 {
 337                                                         mlt_properties_set_double( real_properties, "force_fps", source_fps * speed );
 338                                                         mlt_properties_set_position( real_properties, "length", real_length );
 339                                                         mlt_properties_set_position( real_properties, "out", real_length - 1 );
 340                                                         speed = 1.0;
 341                                                 }
 342                                                 break;
 343                                         }
 344                                 }
 345                         }
 346                 }
 347                 mlt_properties_set_position( properties, "out", mlt_producer_get_length( producer ) - 1 );
 348
 349                 // Since we control the seeking, prevent it from seeking on its own
 350                 mlt_producer_set_speed( real_producer, 0 );
 351                 mlt_producer_set_speed( producer, speed );
 352
 353                 // Override the get_frame method
 354                 producer->get_frame = producer_get_frame;
 355         }
 356         else
 357         {
 358                 if ( producer )
 359                         mlt_producer_close( producer );
 360                 if ( real_producer )
 361                         mlt_producer_close( real_producer );
 362
 363                 producer = NULL;
 364         }
 365         return producer;
 366 }