git.sesse.net Git - vlc/blob - modules/video_filter/motiondetect.c

   1 /*****************************************************************************
   2  * motiondetect.c : Motion detect video effect plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Jérôme Decoodt <djc@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc_vout.h>
  32 #include <vlc_interface.h>
  33 #include <vlc_playlist.h>
  34
  35 #include "filter_common.h"
  36 #include <vlc_charset.h>
  37
  38 /*****************************************************************************
  39  * Local prototypes
  40  *****************************************************************************/
  41 static int  Create    ( vlc_object_t * );
  42 static void Destroy   ( vlc_object_t * );
  43
  44 static int  Init      ( vout_thread_t * );
  45 static void End       ( vout_thread_t * );
  46 static void Render    ( vout_thread_t *, picture_t * );
  47 static void MotionDetect( vout_thread_t *p_vout, picture_t *p_inpic,
  48                                                  picture_t *p_outpic );
  49
  50 static int  SendEvents   ( vlc_object_t *, char const *,
  51                            vlc_value_t, vlc_value_t, void * );
  52
  53 /*****************************************************************************
  54  * Module descriptor
  55  *****************************************************************************/
  56 #define DESC_TEXT N_("Description file")
  57 #define DESC_LONGTEXT N_("A file containing a simple playlist")
  58 #define HISTORY_TEXT N_("History parameter")
  59 /// \bug [String] typo
  60 #define HISTORY_LONGTEXT N_("The umber of frames used for detection.")
  61
  62 vlc_module_begin();
  63     set_description( _("Motion detect video filter") );
  64     set_shortname( _( "Motion detect" ));
  65     set_category( CAT_VIDEO );
  66     set_subcategory( SUBCAT_VIDEO_VFILTER );
  67     set_capability( "video filter", 0 );
  68
  69     add_integer( "motiondetect-history", 1, NULL, HISTORY_TEXT,
  70                                 HISTORY_LONGTEXT, VLC_FALSE );
  71     add_string( "motiondetect-description", "motiondetect", NULL, DESC_TEXT,
  72                                 DESC_LONGTEXT, VLC_FALSE );
  73
  74     set_callbacks( Create, Destroy );
  75 vlc_module_end();
  76
  77 /*****************************************************************************
  78  * vout_sys_t: Motion detect video output method descriptor
  79  *****************************************************************************
  80  * This structure is part of the video output thread descriptor.
  81  * It describes the Motion detect specific properties of an output thread.
  82  *****************************************************************************/
  83 typedef struct area_t
  84 {
  85     int i_x1, i_y1;
  86     int i_x2, i_y2;
  87     int i_matches;
  88     int i_level;
  89     int i_downspeed, i_upspeed;
  90     char *psz_mrl;
  91 } area_t;
  92
  93 struct vout_sys_t
  94 {
  95     vout_thread_t *p_vout;
  96     playlist_t *p_playlist;
  97
  98     uint8_t *p_bufferY;
  99     int i_stack;
 100     area_t** pp_areas;
 101     int i_areas;
 102     int i_history;
 103 };
 104
 105 /*****************************************************************************
 106  * Control: control facility for the vout (forwards to child vout)
 107  *****************************************************************************/
 108 static int Control( vout_thread_t *p_vout, int i_query, va_list args )
 109 {
 110     return vout_vaControl( p_vout->p_sys->p_vout, i_query, args );
 111 }
 112
 113 /*****************************************************************************
 114  * Create: allocates Distort video thread output method
 115  *****************************************************************************
 116  * This function allocates and initializes a Distort vout method.
 117  *****************************************************************************/
 118 static int Create( vlc_object_t *p_this )
 119 {
 120     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 121     char *psz_descfilename;
 122     char buffer[256];
 123     int x1, x2, y1, y2, i_level, i_downspeed, i_upspeed, i;
 124     area_t *p_area;
 125     FILE * p_file;
 126
 127     /* Allocate structure */
 128     p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
 129     if( p_vout->p_sys == NULL )
 130     {
 131         msg_Err( p_vout, "out of memory" );
 132         return VLC_ENOMEM;
 133     }
 134
 135     p_vout->pf_init = Init;
 136     p_vout->pf_end = End;
 137     p_vout->pf_manage = NULL;
 138     p_vout->pf_render = Render;
 139     p_vout->pf_display = NULL;
 140     p_vout->pf_control = Control;
 141
 142     memset( p_vout->p_sys, 0, sizeof( vout_sys_t ) );
 143
 144     p_vout->p_sys->i_history = config_GetInt( p_vout,
 145                                               "motiondetect-history" );
 146
 147     if( !(psz_descfilename = config_GetPsz( p_vout,
 148                                             "motiondetect-description" ) ) )
 149     {
 150         free( p_vout->p_sys );
 151         return VLC_EGENERIC;
 152     }
 153
 154     p_vout->p_sys->p_playlist = vlc_object_find( p_this, VLC_OBJECT_PLAYLIST,
 155                                                  FIND_ANYWHERE );
 156     if( !p_vout->p_sys->p_playlist )
 157     {
 158          msg_Err( p_vout, "playlist not found" );
 159          free( p_vout->p_sys );
 160          return VLC_EGENERIC;
 161     }
 162
 163     /* Parse description file and allocate areas */
 164     p_file = utf8_fopen( psz_descfilename, "r" );
 165     if( !p_file )
 166     {
 167         msg_Err( p_this, "Failed to open description file %s",
 168                             psz_descfilename );
 169         free( psz_descfilename );
 170         free( p_vout->p_sys );
 171         return VLC_EGENERIC;
 172     }
 173     p_vout->p_sys->i_areas = 0;
 174     while( fscanf( p_file, "%d,%d,%d,%d,%d,%d,%d,",
 175                             &x1, &y1, &x2, &y2, &i_level,
 176                             &i_downspeed, &i_upspeed ) == 7 )
 177     {
 178         for( i = 0 ; i < 255 ; i++ )
 179         {
 180             fread( buffer + i, 1, 1, p_file );
 181             if( *( buffer + i ) == '\n' )
 182                 break;
 183         }
 184         *( buffer + i )  = 0;
 185         p_vout->p_sys->i_areas++;
 186         p_vout->p_sys->pp_areas = realloc( p_vout->p_sys->pp_areas,
 187                                         p_vout->p_sys->i_areas *
 188                                                     sizeof( area_t ) );
 189         if( !p_vout->p_sys->pp_areas )
 190             /*FIXME: clean this... */
 191             return VLC_ENOMEM;
 192         p_area = malloc( sizeof( area_t ) );
 193         if( !p_area )
 194             break;
 195
 196         p_area->i_x1 = x1;
 197         p_area->i_x2 = x2;
 198         p_area->i_y1 = y1;
 199         p_area->i_y2 = y2;
 200         p_area->i_matches = 0;
 201         p_area->i_level = i_level;
 202         p_area->i_downspeed = i_downspeed;
 203         p_area->i_upspeed = i_upspeed;
 204
 205         p_area->psz_mrl = strdup(buffer);
 206         p_vout->p_sys->pp_areas[p_vout->p_sys->i_areas-1] = p_area;
 207     }
 208     fclose( p_file );
 209     return VLC_SUCCESS;
 210 }
 211
 212 /*****************************************************************************
 213  * Init: initialize Motion detect video thread output method
 214  *****************************************************************************/
 215 static int Init( vout_thread_t *p_vout )
 216 {
 217     int i_index;
 218     picture_t *p_pic;
 219     video_format_t fmt = {0};
 220
 221     I_OUTPUTPICTURES = 0;
 222
 223     /* Initialize the output structure */
 224     p_vout->output.i_chroma = p_vout->render.i_chroma;
 225     p_vout->output.i_width  = p_vout->render.i_width;
 226     p_vout->output.i_height = p_vout->render.i_height;
 227     p_vout->output.i_aspect = p_vout->render.i_aspect;
 228     p_vout->fmt_out = p_vout->fmt_in;
 229     fmt = p_vout->fmt_out;
 230
 231     /* Try to open the real video output */
 232     msg_Dbg( p_vout, "spawning the real video output" );
 233
 234     p_vout->p_sys->p_vout = vout_Create( p_vout, &fmt );
 235
 236     /* Everything failed */
 237     if( p_vout->p_sys->p_vout == NULL )
 238     {
 239         msg_Err( p_vout, "cannot open vout, aborting" );
 240         return VLC_EGENERIC;
 241     }
 242
 243     ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );
 244
 245     ADD_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
 246
 247     ADD_PARENT_CALLBACKS( SendEventsToChild );
 248
 249     return VLC_SUCCESS;
 250 }
 251
 252 /*****************************************************************************
 253  * End: terminate Motion detect video thread output method
 254  *****************************************************************************/
 255 static void End( vout_thread_t *p_vout )
 256 {
 257     int i_index;
 258
 259     /* Free the fake output buffers we allocated */
 260     for( i_index = I_OUTPUTPICTURES ; i_index ; )
 261     {
 262         i_index--;
 263         free( PP_OUTPUTPICTURE[ i_index ]->p_data_orig );
 264     }
 265 }
 266
 267 /*****************************************************************************
 268  * Destroy: destroy Motion detect video thread output method
 269  *****************************************************************************
 270  * Terminate an output method created by DistortCreateOutputMethod
 271  *****************************************************************************/
 272 static void Destroy( vlc_object_t *p_this )
 273 {
 274     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 275     int i;
 276
 277     if( p_vout->p_sys->p_vout )
 278     {
 279         DEL_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
 280         vlc_object_detach( p_vout->p_sys->p_vout );
 281         vout_Destroy( p_vout->p_sys->p_vout );
 282     }
 283
 284     DEL_PARENT_CALLBACKS( SendEventsToChild );
 285
 286     for( i = 0 ; i < p_vout->p_sys->i_areas ; i++ )
 287     {
 288         free( p_vout->p_sys->pp_areas[i]->psz_mrl );
 289         free( p_vout->p_sys->pp_areas[i] );
 290     }
 291
 292     free( p_vout->p_sys->pp_areas );
 293     free( p_vout->p_sys );
 294 }
 295
 296 /*****************************************************************************
 297  * Render: displays previously rendered output
 298  *****************************************************************************
 299  * This function send the currently rendered image to Distort image, waits
 300  * until it is displayed and switch the two rendering buffers, preparing next
 301  * frame.
 302  *****************************************************************************/
 303 static void Render( vout_thread_t *p_vout, picture_t *p_pic )
 304 {
 305     picture_t *p_outpic;
 306
 307     /* This is a new frame. Get a structure from the video_output. */
 308     while( ( p_outpic = vout_CreatePicture( p_vout->p_sys->p_vout, 0, 0, 0 ) )
 309               == NULL )
 310     {
 311         if( p_vout->b_die || p_vout->b_error )
 312         {
 313             return;
 314         }
 315         msleep( VOUT_OUTMEM_SLEEP );
 316     }
 317
 318     vout_DatePicture( p_vout->p_sys->p_vout, p_outpic, p_pic->date );
 319
 320     MotionDetect( p_vout, p_pic, p_outpic );
 321
 322     vout_DisplayPicture( p_vout->p_sys->p_vout, p_outpic );
 323 }
 324
 325 /*****************************************************************************
 326  * MotionDetect: calculates new matches
 327  *****************************************************************************/
 328 static void MotionDetect( vout_thread_t *p_vout, picture_t *p_inpic,
 329                                                  picture_t *p_outpic )
 330 {
 331 #define pp_curent_area p_vout->p_sys->pp_areas[i_area]
 332
 333     int i_index, i_index_col, i_area;
 334     for( i_index = 0 ; i_index < p_inpic->i_planes ; i_index++ )
 335     {
 336         int i_line, i_num_lines, i_offset, i_size, i_diff;
 337         uint8_t *p_in, *p_out, *p_last_in, *p_buffer;
 338
 339         p_in = p_inpic->p[i_index].p_pixels;
 340         p_out = p_outpic->p[i_index].p_pixels;
 341
 342         i_num_lines = p_inpic->p[i_index].i_visible_lines;
 343         i_size = p_inpic->p[i_index].i_lines * p_inpic->p[i_index].i_pitch;
 344
 345         p_vout->p_libvlc->pf_memcpy( p_out, p_in, i_size );
 346         switch( i_index )
 347         {
 348         case Y_PLANE:
 349             p_buffer = p_vout->p_sys->p_bufferY;
 350
 351             if( p_buffer == NULL)
 352             {
 353                 p_buffer = malloc( p_vout->p_sys->i_history * i_size);
 354                 memset( p_buffer, 0, p_vout->p_sys->i_history * i_size );
 355
 356                 p_vout->p_sys->p_bufferY = p_buffer;
 357                 p_vout->p_sys->i_stack = 0;
 358             }
 359
 360             i_offset = i_size * p_vout->p_sys->i_stack;
 361             p_last_in = p_buffer + i_offset;
 362             for( i_area = 0 ; i_area < p_vout->p_sys->i_areas ; i_area++)
 363             {
 364                 int i_tmp = 0, i_nb_pixels;
 365                 p_last_in = p_buffer + i_offset;
 366                 p_in = p_inpic->p[i_index].p_pixels;
 367                 p_out = p_outpic->p[i_index].p_pixels;
 368                 if( ( pp_curent_area->i_y1 > p_inpic->p[i_index].i_lines ) ||
 369                     ( pp_curent_area->i_x1 > p_inpic->p[i_index].i_pitch ) )
 370                     continue;
 371                 if( ( pp_curent_area->i_y2 > p_inpic->p[i_index].i_lines ) )
 372                     pp_curent_area->i_y2 = p_inpic->p[i_index].i_lines;
 373                 if( ( pp_curent_area->i_x2 > p_inpic->p[i_index].i_pitch ) )
 374                     pp_curent_area->i_x2 = p_inpic->p[i_index].i_pitch;
 375
 376                 for( i_line = pp_curent_area->i_y1 ;
 377                      i_line < pp_curent_area->i_y2 ; i_line++ )
 378                 {
 379                     for( i_index_col = pp_curent_area->i_x1 ;
 380                          i_index_col < pp_curent_area->i_x2 ; i_index_col++ )
 381                     {
 382                         i_diff = (*(p_last_in + i_index_col +
 383                                         i_line * p_inpic->p[i_index].i_pitch)
 384                                 - *(p_in      + i_index_col +
 385                                         i_line * p_inpic->p[i_index].i_pitch));
 386                         if( i_diff < 0)
 387                             i_diff = -i_diff;
 388
 389                         if( i_diff > pp_curent_area->i_level )
 390                             i_tmp += pp_curent_area->i_upspeed;
 391
 392                         *( p_out + i_index_col + i_line *
 393                                         p_inpic->p[i_index].i_pitch ) =
 394                                                 pp_curent_area->i_matches;
 395                     }
 396                 }
 397                 i_nb_pixels = ( pp_curent_area->i_y2 - pp_curent_area->i_y1 ) *
 398                               ( pp_curent_area->i_x2 - pp_curent_area->i_x1 );
 399                 pp_curent_area->i_matches += i_tmp / i_nb_pixels -
 400                                     pp_curent_area->i_downspeed;
 401                 if( pp_curent_area->i_matches < 0)
 402                     pp_curent_area->i_matches = 0;
 403                 if( pp_curent_area->i_matches > 255)
 404                 {
 405                     playlist_item_t *p_item = playlist_ItemNew( p_vout,
 406                                         (const char*)pp_curent_area->psz_mrl,
 407                                         pp_curent_area->psz_mrl );
 408                     msg_Dbg( p_vout, "Area(%d) matched, going to %s\n", i_area,
 409                                         pp_curent_area->psz_mrl );
 410                     playlist_Control( p_vout->p_sys->p_playlist,
 411                                         PLAYLIST_VIEWPLAY, NULL, p_item );
 412                     pp_curent_area->i_matches = 0;
 413                 }
 414             }
 415             p_last_in = p_buffer + i_offset;
 416             p_in = p_inpic->p[i_index].p_pixels;
 417             p_out = p_outpic->p[i_index].p_pixels;
 418
 419             p_vout->p_libvlc->pf_memcpy( p_last_in, p_in, i_size );
 420             break;
 421         default:
 422             break;
 423         }
 424     }
 425     p_vout->p_sys->i_stack++;
 426     if( p_vout->p_sys->i_stack >= p_vout->p_sys->i_history )
 427         p_vout->p_sys->i_stack = 0;
 428 #undef pp_curent_area
 429 }
 430
 431 /*****************************************************************************
 432  * SendEvents: forward mouse and keyboard events to the parent p_vout
 433  *****************************************************************************/
 434 static int SendEvents( vlc_object_t *p_this, char const *psz_var,
 435                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
 436 {
 437     var_Set( (vlc_object_t *)p_data, psz_var, newval );
 438
 439     return VLC_SUCCESS;
 440 }
 441
 442 /*****************************************************************************
 443  * SendEventsToChild: forward events to the child/children vout
 444  *****************************************************************************/
 445 static int SendEventsToChild( vlc_object_t *p_this, char const *psz_var,
 446                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
 447 {
 448     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 449     var_Set( p_vout->p_sys->p_vout, psz_var, newval );
 450     return VLC_SUCCESS;
 451 }