git.sesse.net Git - mlt/blob - src/modules/sdl/consumer_sdl_still.c

   1 /*
   2  * consumer_sdl_still.c -- A Simple DirectMedia Layer consumer
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "consumer_sdl.h"
  22 #include <framework/mlt_frame.h>
  23 #include <framework/mlt_deque.h>
  24 #include <framework/mlt_factory.h>
  25 #include <framework/mlt_filter.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <pthread.h>
  30 #include <SDL/SDL.h>
  31 #include <SDL/SDL_syswm.h>
  32 #include <sys/time.h>
  33
  34 /** This classes definition.
  35 */
  36
  37 typedef struct consumer_sdl_s *consumer_sdl;
  38
  39 struct consumer_sdl_s
  40 {
  41         struct mlt_consumer_s parent;
  42         mlt_properties properties;
  43         pthread_t thread;
  44         int joined;
  45         int running;
  46         int window_width;
  47         int window_height;
  48         float aspect_ratio;
  49         float display_aspect;
  50         double last_frame_aspect;
  51         int width;
  52         int height;
  53         int playing;
  54         int sdl_flags;
  55         SDL_Surface *sdl_screen;
  56         SDL_Rect rect;
  57         uint8_t *buffer;
  58         int last_position;
  59         mlt_producer last_producer;
  60 };
  61
  62 /** Forward references to static functions.
  63 */
  64
  65 static int consumer_start( mlt_consumer parent );
  66 static int consumer_stop( mlt_consumer parent );
  67 static int consumer_is_stopped( mlt_consumer parent );
  68 static void consumer_close( mlt_consumer parent );
  69 static void *consumer_thread( void * );
  70 static int consumer_get_dimensions( int *width, int *height );
  71 static void consumer_sdl_event( mlt_listener listener, mlt_properties owner, mlt_service this, void **args );
  72
  73 /** This is what will be called by the factory - anything can be passed in
  74         via the argument, but keep it simple.
  75 */
  76
  77 mlt_consumer consumer_sdl_still_init( char *arg )
  78 {
  79         // Create the consumer object
  80         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  81
  82         // If no malloc'd and consumer init ok
  83         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  84         {
  85                 // Get the parent consumer object
  86                 mlt_consumer parent = &this->parent;
  87
  88                 // Attach a colour space converter
  89                 mlt_filter filter = mlt_factory_filter( "avcolour_space", NULL );
  90                 mlt_properties_set_int( mlt_filter_properties( filter ), "forced", mlt_image_yuv422 );
  91                 mlt_service_attach( mlt_consumer_service( &this->parent ), filter );
  92                 mlt_filter_close( filter );
  93
  94                 // We have stuff to clean up, so override the close method
  95                 parent->close = consumer_close;
  96
  97                 // get a handle on properties
  98                 mlt_service service = mlt_consumer_service( parent );
  99                 this->properties = mlt_service_properties( service );
 100
 101                 // Default scaler (for now we'll use nearest)
 102                 mlt_properties_set( this->properties, "rescale", "nearest" );
 103
 104                 // We're always going to run this in non-realtime mode
 105                 mlt_properties_set( this->properties, "real_time", "0" );
 106
 107                 // Default progressive true
 108                 mlt_properties_set_int( this->properties, "progressive", 1 );
 109
 110                 // Get sample aspect ratio
 111                 this->aspect_ratio = mlt_properties_get_double( this->properties, "aspect_ratio" );
 112
 113                 // Ensure we don't join on a non-running object
 114                 this->joined = 1;
 115
 116                 // Default display aspect ratio
 117                 this->display_aspect = 4.0 / 3.0;
 118
 119                 // process actual param
 120                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 121                 {
 122                         this->width = mlt_properties_get_int( this->properties, "width" );
 123                         this->height = mlt_properties_get_int( this->properties, "height" );
 124                 }
 125
 126                 // Default window size
 127                 this->window_width = ( float )this->height * this->display_aspect;
 128                 this->window_height = this->height;
 129
 130                 // Set the sdl flags
 131                 this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE | SDL_DOUBLEBUF;
 132
 133                 // Allow thread to be started/stopped
 134                 parent->start = consumer_start;
 135                 parent->stop = consumer_stop;
 136                 parent->is_stopped = consumer_is_stopped;
 137
 138                 // Register specific events
 139                 mlt_events_register( this->properties, "consumer-sdl-event", ( mlt_transmitter )consumer_sdl_event );
 140
 141                 // Return the consumer produced
 142                 return parent;
 143         }
 144
 145         // malloc or consumer init failed
 146         free( this );
 147
 148         // Indicate failure
 149         return NULL;
 150 }
 151
 152 static void consumer_sdl_event( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
 153 {
 154         if ( listener != NULL )
 155                 listener( owner, this, ( SDL_Event * )args[ 0 ] );
 156 }
 157
 158 static int consumer_start( mlt_consumer parent )
 159 {
 160         consumer_sdl this = parent->child;
 161
 162         if ( !this->running )
 163         {
 164                 pthread_attr_t thread_attributes;
 165
 166                 consumer_stop( parent );
 167
 168                 this->last_position = -1;
 169                 this->running = 1;
 170                 this->joined = 0;
 171
 172                 // Allow the user to force resizing to window size
 173                 if ( mlt_properties_get_int( this->properties, "resize" ) )
 174                 {
 175                         mlt_properties_set_int( this->properties, "width", this->width );
 176                         mlt_properties_set_int( this->properties, "height", this->height );
 177                 }
 178
 179                 //this->width = this->height * this->display_aspect;
 180
 181                 // Inherit the scheduling priority
 182                 pthread_attr_init( &thread_attributes );
 183                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 184
 185                 pthread_create( &this->thread, &thread_attributes, consumer_thread, this );
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int consumer_stop( mlt_consumer parent )
 192 {
 193         // Get the actual object
 194         consumer_sdl this = parent->child;
 195
 196         if ( this->joined == 0 )
 197         {
 198                 // Kill the thread and clean up
 199                 this->running = 0;
 200
 201                 pthread_join( this->thread, NULL );
 202                 this->joined = 1;
 203         }
 204
 205         return 0;
 206 }
 207
 208 static int consumer_is_stopped( mlt_consumer parent )
 209 {
 210         consumer_sdl this = parent->child;
 211         return !this->running;
 212 }
 213
 214 static int sdl_lock_display( )
 215 {
 216         SDL_Surface *screen = SDL_GetVideoSurface( );
 217         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 218 }
 219
 220 static void sdl_unlock_display( )
 221 {
 222         SDL_Surface *screen = SDL_GetVideoSurface( );
 223         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 224                 SDL_UnlockSurface( screen );
 225 }
 226
 227 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 228 {
 229         // Get the properties of this consumer
 230         mlt_properties properties = this->properties;
 231
 232         mlt_image_format vfmt = mlt_image_rgb24;
 233         int height = this->height;
 234         int width = this->width;
 235         uint8_t *image = NULL;
 236         int changed = 0;
 237
 238         void ( *lock )( void ) = mlt_properties_get_data( properties, "app_lock", NULL );
 239         void ( *unlock )( void ) = mlt_properties_get_data( properties, "app_unlock", NULL );
 240
 241         if ( lock != NULL ) lock( );
 242
 243         sdl_lock_display();
 244
 245         // Handle events
 246         if ( this->sdl_screen != NULL )
 247         {
 248                 SDL_Event event;
 249
 250                 changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 251
 252                 while ( SDL_PollEvent( &event ) )
 253                 {
 254                         mlt_events_fire( this->properties, "consumer-sdl-event", &event, NULL );
 255
 256                         switch( event.type )
 257                         {
 258                                 case SDL_VIDEORESIZE:
 259                                         this->window_width = event.resize.w;
 260                                         this->window_height = event.resize.h;
 261                                         changed = 1;
 262                                         break;
 263                                 case SDL_QUIT:
 264                                         this->running = 0;
 265                                         break;
 266                                 case SDL_KEYDOWN:
 267                                         {
 268                                                 mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 269                                                 char keyboard[ 2 ] = " ";
 270                                                 void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 271                                                 if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 272                                                 {
 273                                                         keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 274                                                         callback( producer, keyboard );
 275                                                 }
 276                                         }
 277                                         break;
 278                         }
 279                 }
 280         }
 281
 282         if ( ( ( int )( this->last_frame_aspect * 1000 ) != ( int )( mlt_frame_get_aspect_ratio( frame ) * 1000 ) &&
 283                  ( mlt_frame_get_aspect_ratio( frame ) != 1.0 || this->last_frame_aspect == 0.0 ) ) )
 284         {
 285                 this->last_frame_aspect = mlt_frame_get_aspect_ratio( frame );
 286                 changed = 1;
 287         }
 288
 289         if ( this->sdl_screen == NULL || changed || mlt_properties_get_int( properties, "changed" ) == 2 )
 290         {
 291                 // open SDL window
 292                 this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 16, this->sdl_flags );
 293                 if ( consumer_get_dimensions( &this->window_width, &this->window_height ) )
 294                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 16, this->sdl_flags );
 295
 296                 changed = 1;
 297                 mlt_properties_set_int( properties, "changed", 0 );
 298
 299                 // May as well use the mlt rescaler...
 300                 //if ( mlt_properties_get( properties, "rescale" ) != NULL && !strcmp( mlt_properties_get( properties, "rescale" ), "none" ) )
 301                         //mlt_properties_set( properties, "rescale", "nearest" );
 302
 303                 // Determine window's new display aspect ratio
 304                 float this_aspect = this->display_aspect / ( ( float )this->window_width / ( float )this->window_height );
 305
 306                 this->rect.w = this_aspect * this->window_width;
 307                 this->rect.h = this->window_height;
 308                 if ( this->rect.w > this->window_width )
 309                 {
 310                         this->rect.w = this->window_width;
 311                         this->rect.h = ( 1.0 / this_aspect ) * this->window_height;
 312                 }
 313
 314                 this->rect.x = ( this->window_width - this->rect.w ) / 2;
 315                 this->rect.y = ( this->window_height - this->rect.h ) / 2;
 316
 317                 mlt_properties_set_int( this->properties, "rect_x", this->rect.x );
 318                 mlt_properties_set_int( this->properties, "rect_y", this->rect.y );
 319                 mlt_properties_set_int( this->properties, "rect_w", this->rect.w );
 320                 mlt_properties_set_int( this->properties, "rect_h", this->rect.h );
 321         }
 322         else
 323         {
 324                 changed = mlt_properties_get_int( properties, "changed" ) | mlt_properties_get_int( mlt_frame_properties( frame ), "refresh" );
 325                 mlt_properties_set_int( properties, "changed", 0 );
 326         }
 327
 328         if ( changed == 0 &&
 329                  this->last_position == mlt_frame_get_position( frame ) &&
 330                  this->last_producer == mlt_properties_get_data( mlt_frame_properties( frame ), "_producer", NULL ) )
 331         {
 332                 sdl_unlock_display( );
 333                 if ( unlock != NULL )
 334                         unlock( );
 335                 return 0;
 336         }
 337
 338         // Update last frame shown info
 339         this->last_position = mlt_frame_get_position( frame );
 340         this->last_producer = mlt_properties_get_data( mlt_frame_properties( frame ), "_producer", NULL );
 341
 342         // Get the image, width and height
 343         if ( image == NULL )
 344         {
 345                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 346
 347                 // I would like to provide upstream scaling here, but this is incorrect
 348                 // Something? (or everything?) is too sensitive to aspect ratio
 349                 //width = this->rect.w;
 350                 //height = this->rect.h;
 351                 //mlt_properties_set( mlt_frame_properties( frame ), "distort", "true" );
 352                 //mlt_properties_set_int( mlt_frame_properties( frame ), "normalised_width", width );
 353                 //mlt_properties_set_int( mlt_frame_properties( frame ), "normalised_height", height );
 354
 355                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 356         }
 357
 358         if ( this->sdl_screen != NULL )
 359         {
 360                 // Calculate the scan length
 361                 int scanlength = this->sdl_screen->pitch / 2;
 362
 363                 // Obtain the clip rect from the screen
 364                 SDL_Rect rect = this->rect;
 365
 366                 // Generate the affine transform scaling values
 367                 int scale_width = ( width << 16 ) / rect.w;
 368                 int scale_height = ( height << 16 ) / rect.h;
 369
 370                 // Constants defined for clarity and optimisation
 371                 int stride = width * 3;
 372                 uint16_t *start = ( uint16_t * )this->sdl_screen->pixels + rect.y * scanlength + rect.x;
 373
 374                 int x, y, row_index;
 375                 uint16_t *p;
 376                 uint8_t *q, *row;
 377
 378                 // Iterate through the screen using a very basic scaling algorithm
 379                 for ( y = 0; y < rect.h && this->last_position != -1; y ++ )
 380                 {
 381                         // Obtain the pointer to the current screen row
 382                         p = start;
 383
 384                         // Calculate the row_index
 385                         row_index = ( scale_height * y ) >> 16;
 386
 387                         // Calculate the pointer for the y offset (positioned on B instead of R)
 388                         row = image + stride * row_index;
 389
 390                         // Iterate through the screen width
 391                         for ( x = 0; x < rect.w; x ++ )
 392                         {
 393                                 // Obtain the pixel pointer
 394                                 q = row + ( ( ( scale_width * x ) >> 16 ) * 3 );
 395
 396                                 // Map the BGR colour from the frame to the SDL format
 397                                 *p ++ = SDL_MapRGB( this->sdl_screen->format, *q, *( q + 1 ), *( q + 2 ) );
 398                         }
 399
 400                         // Move to the next row
 401                         start += scanlength;
 402                 }
 403
 404                 // Flip it into sight
 405                 SDL_Flip( this->sdl_screen );
 406         }
 407
 408         sdl_unlock_display();
 409
 410         if ( unlock != NULL ) unlock( );
 411
 412         return 0;
 413 }
 414
 415 /** Threaded wrapper for pipe.
 416 */
 417
 418 static void *consumer_thread( void *arg )
 419 {
 420         // Identify the arg
 421         consumer_sdl this = arg;
 422
 423         // Get the consumer
 424         mlt_consumer consumer = &this->parent;
 425
 426         // internal intialization
 427         mlt_frame frame = NULL;
 428         struct timespec tm = { 0, 1000 };
 429
 430         if ( mlt_properties_get_int( mlt_consumer_properties( consumer ), "sdl_started" ) == 0 )
 431         {
 432                 if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE ) < 0 )
 433                 {
 434                         fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 435                         return NULL;
 436                 }
 437
 438                 SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 439                 SDL_EnableUNICODE( 1 );
 440         }
 441         else
 442         {
 443                 mlt_properties_set_int( mlt_consumer_properties( consumer ), "changed", 2 );
 444                 if ( SDL_GetVideoSurface( ) != NULL )
 445                         consumer_get_dimensions( &this->window_width, &this->window_height );
 446         }
 447
 448         // Loop until told not to
 449         while( this->running )
 450         {
 451                 // Get a frame from the attached producer
 452                 frame = mlt_consumer_rt_frame( consumer );
 453
 454                 // Ensure that we have a frame
 455                 if ( frame != NULL )
 456                 {
 457                         consumer_play_video( this, frame );
 458                         mlt_frame_close( frame );
 459                         nanosleep( &tm, NULL );
 460                 }
 461         }
 462
 463         if ( mlt_properties_get_int( mlt_consumer_properties( consumer ), "sdl_started" ) == 0 )
 464                 SDL_Quit( );
 465
 466         this->sdl_screen = NULL;
 467
 468         return NULL;
 469 }
 470
 471 static int consumer_get_dimensions( int *width, int *height )
 472 {
 473         int changed = 0;
 474
 475         // SDL windows manager structure
 476         SDL_SysWMinfo wm;
 477
 478         // Specify the SDL Version
 479         SDL_VERSION( &wm.version );
 480
 481         // Get the wm structure
 482         if ( SDL_GetWMInfo( &wm ) == 1 )
 483         {
 484                 // Check that we have the X11 wm
 485                 if ( wm.subsystem == SDL_SYSWM_X11 )
 486                 {
 487                         // Get the SDL window
 488                         Window window = wm.info.x11.window;
 489
 490                         // Get the display session
 491                         Display *display = wm.info.x11.display;
 492
 493                         // Get the window attributes
 494                         XWindowAttributes attr;
 495                         XGetWindowAttributes( display, window, &attr );
 496
 497                         // Determine whether window has changed
 498                         changed = *width != attr.width || *height != attr.height;
 499
 500                         // Return width and height
 501                         *width = attr.width;
 502                         *height = attr.height;
 503                 }
 504         }
 505
 506         return changed;
 507 }
 508
 509 /** Callback to allow override of the close method.
 510 */
 511
 512 static void consumer_close( mlt_consumer parent )
 513 {
 514         // Get the actual object
 515         consumer_sdl this = parent->child;
 516
 517         // Stop the consumer
 518         mlt_consumer_stop( parent );
 519
 520         // Now clean up the rest
 521         mlt_consumer_close( parent );
 522
 523         // Finally clean up this
 524         free( this );
 525 }