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

   1 /*
   2  * consumer_sdl_preview.c -- A Simple DirectMedia Layer consumer
   3  * Copyright (C) 2004-2005 Ushodaya Enterprises Limited
   4  * Author: Charles Yates
   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_consumer.h>
  22 #include <framework/mlt_frame.h>
  23 #include <framework/mlt_factory.h>
  24 #include <framework/mlt_producer.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <pthread.h>
  28 #include <SDL/SDL.h>
  29 #include <SDL/SDL_syswm.h>
  30
  31 extern pthread_mutex_t mlt_sdl_mutex;
  32
  33 typedef struct consumer_sdl_s *consumer_sdl;
  34
  35 struct consumer_sdl_s
  36 {
  37         struct mlt_consumer_s parent;
  38         mlt_consumer active;
  39         int ignore_change;
  40         mlt_consumer play;
  41         mlt_consumer still;
  42         pthread_t thread;
  43         int joined;
  44         int running;
  45         int sdl_flags;
  46         double last_speed;
  47
  48         pthread_cond_t refresh_cond;
  49         pthread_mutex_t refresh_mutex;
  50         int refresh_count;
  51 };
  52
  53 /** Forward references to static functions.
  54 */
  55
  56 static int consumer_start( mlt_consumer parent );
  57 static int consumer_stop( mlt_consumer parent );
  58 static int consumer_is_stopped( mlt_consumer parent );
  59 static void consumer_close( mlt_consumer parent );
  60 static void *consumer_thread( void * );
  61 static void consumer_frame_show_cb( mlt_consumer sdl, mlt_consumer this, mlt_frame frame );
  62 static void consumer_sdl_event_cb( mlt_consumer sdl, mlt_consumer this, SDL_Event *event );
  63 static void consumer_refresh_cb( mlt_consumer sdl, mlt_consumer this, char *name );
  64
  65 mlt_consumer consumer_sdl_preview_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  66 {
  67         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  68         if ( this != NULL && mlt_consumer_init( &this->parent, this, profile ) == 0 )
  69         {
  70                 // Get the parent consumer object
  71                 mlt_consumer parent = &this->parent;
  72
  73                 // Get the properties
  74                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( parent );
  75
  76                 // Get the width and height
  77                 int width = mlt_properties_get_int( properties, "width" );
  78                 int height = mlt_properties_get_int( properties, "height" );
  79
  80                 // Process actual param
  81                 if ( arg == NULL || sscanf( arg, "%dx%d", &width, &height ) == 2 )
  82                 {
  83                         mlt_properties_set_int( properties, "width", width );
  84                         mlt_properties_set_int( properties, "height", height );
  85                 }
  86
  87                 // Create child consumers
  88                 this->play = mlt_factory_consumer( profile, "sdl", arg );
  89                 this->still = mlt_factory_consumer( profile, "sdl_still", arg );
  90                 mlt_properties_set( properties, "real_time", "0" );
  91                 mlt_properties_set( properties, "rescale", "nearest" );
  92                 mlt_properties_set( properties, "deinterlace_method", "onefield" );
  93                 parent->close = consumer_close;
  94                 parent->start = consumer_start;
  95                 parent->stop = consumer_stop;
  96                 parent->is_stopped = consumer_is_stopped;
  97                 this->joined = 1;
  98                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( this->play ), this, "consumer-frame-show", ( mlt_listener )consumer_frame_show_cb );
  99                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( this->still ), this, "consumer-frame-show", ( mlt_listener )consumer_frame_show_cb );
 100                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( this->play ), this, "consumer-sdl-event", ( mlt_listener )consumer_sdl_event_cb );
 101                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( this->still ), this, "consumer-sdl-event", ( mlt_listener )consumer_sdl_event_cb );
 102                 pthread_cond_init( &this->refresh_cond, NULL );
 103                 pthread_mutex_init( &this->refresh_mutex, NULL );
 104                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( parent ), this, "property-changed", ( mlt_listener )consumer_refresh_cb );
 105                 return parent;
 106         }
 107         free( this );
 108         return NULL;
 109 }
 110
 111 void consumer_frame_show_cb( mlt_consumer sdl, mlt_consumer parent, mlt_frame frame )
 112 {
 113         consumer_sdl this = parent->child;
 114         this->last_speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" );
 115         mlt_events_fire( MLT_CONSUMER_PROPERTIES( parent ), "consumer-frame-show", frame, NULL );
 116 }
 117
 118 static void consumer_sdl_event_cb( mlt_consumer sdl, mlt_consumer parent, SDL_Event *event )
 119 {
 120         mlt_events_fire( MLT_CONSUMER_PROPERTIES( parent ), "consumer-sdl-event", event, NULL );
 121 }
 122
 123 static void consumer_refresh_cb( mlt_consumer sdl, mlt_consumer parent, char *name )
 124 {
 125         if ( !strcmp( name, "refresh" ) )
 126         {
 127                 consumer_sdl this = parent->child;
 128                 pthread_mutex_lock( &this->refresh_mutex );
 129                 this->refresh_count = this->refresh_count <= 0 ? 1 : this->refresh_count ++;
 130                 pthread_cond_broadcast( &this->refresh_cond );
 131                 pthread_mutex_unlock( &this->refresh_mutex );
 132         }
 133 }
 134
 135 static int consumer_start( mlt_consumer parent )
 136 {
 137         consumer_sdl this = parent->child;
 138
 139         if ( !this->running )
 140         {
 141                 // properties
 142                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( parent );
 143                 mlt_properties play = MLT_CONSUMER_PROPERTIES( this->play );
 144                 mlt_properties still = MLT_CONSUMER_PROPERTIES( this->still );
 145
 146                 char *window_id = mlt_properties_get( properties, "window_id" );
 147                 char *audio_driver = mlt_properties_get( properties, "audio_driver" );
 148                 char *video_driver = mlt_properties_get( properties, "video_driver" );
 149                 char *audio_device = mlt_properties_get( properties, "audio_device" );
 150                 char *output_display = mlt_properties_get( properties, "output_display" );
 151                 int progressive = mlt_properties_get_int( properties, "progressive" ) | mlt_properties_get_int( properties, "deinterlace" );
 152
 153                 consumer_stop( parent );
 154
 155                 this->running = 1;
 156                 this->joined = 0;
 157                 this->last_speed = 1;
 158
 159                 if ( output_display != NULL )
 160                         setenv( "DISPLAY", output_display, 1 );
 161
 162                 if ( window_id != NULL )
 163                         setenv( "SDL_WINDOWID", window_id, 1 );
 164
 165                 if ( video_driver != NULL )
 166                         setenv( "SDL_VIDEODRIVER", video_driver, 1 );
 167
 168                 if ( audio_driver != NULL )
 169                         setenv( "SDL_AUDIODRIVER", audio_driver, 1 );
 170
 171                 if ( audio_device != NULL )
 172                         setenv( "AUDIODEV", audio_device, 1 );
 173
 174                 if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE ) < 0 )
 175                 {
 176                         fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 177                         return -1;
 178                 }
 179
 180                 SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 181                 SDL_EnableUNICODE( 1 );
 182
 183                 // Pass properties down
 184                 mlt_properties_set_data( play, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
 185                 mlt_properties_set_data( still, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
 186                 mlt_properties_set_data( play, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
 187                 mlt_properties_set_data( still, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
 188
 189                 mlt_properties_set_int( play, "progressive", progressive );
 190                 mlt_properties_set_int( still, "progressive", progressive );
 191
 192                 mlt_properties_pass_list( play, properties, "resize,rescale,width,height,aspect_ratio,display_ratio,volume" );
 193                 mlt_properties_pass_list( still, properties, "resize,rescale,width,height,aspect_ratio,display_ratio" );
 194                 mlt_properties_pass_list( play, properties, "deinterlace_method" );
 195                 mlt_properties_pass_list( still, properties, "deinterlace_method" );
 196                 mlt_properties_pass_list( play, properties, "preview_off,preview_format,window_background" );
 197                 mlt_properties_pass_list( still, properties, "preview_off,preview_format,window_background" );
 198
 199                 mlt_properties_pass( play, properties, "play." );
 200                 mlt_properties_pass( still, properties, "still." );
 201
 202                 mlt_properties_set_data( play, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
 203                 mlt_properties_set_data( still, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
 204                 mlt_properties_set_data( play, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
 205                 mlt_properties_set_data( still, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
 206
 207                 mlt_properties_set_int( play, "put_mode", 1 );
 208                 mlt_properties_set_int( still, "put_mode", 1 );
 209
 210                 // Start the still producer just to initialise the gui
 211                 mlt_consumer_start( this->still );
 212                 this->active = this->still;
 213
 214                 // Inform child consumers that we control the sdl
 215                 mlt_properties_set_int( play, "sdl_started", 1 );
 216                 mlt_properties_set_int( still, "sdl_started", 1 );
 217
 218                 pthread_create( &this->thread, NULL, consumer_thread, this );
 219         }
 220
 221         return 0;
 222 }
 223
 224 static int consumer_stop( mlt_consumer parent )
 225 {
 226         // Get the actual object
 227         consumer_sdl this = parent->child;
 228
 229         if ( this->joined == 0 )
 230         {
 231                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( parent );
 232                 int app_locked = mlt_properties_get_int( properties, "app_locked" );
 233                 void ( *lock )( void ) = mlt_properties_get_data( properties, "app_lock", NULL );
 234                 void ( *unlock )( void ) = mlt_properties_get_data( properties, "app_unlock", NULL );
 235
 236                 if ( app_locked && unlock ) unlock( );
 237
 238                 // Kill the thread and clean up
 239                 this->running = 0;
 240
 241                 pthread_mutex_lock( &this->refresh_mutex );
 242                 pthread_cond_broadcast( &this->refresh_cond );
 243                 pthread_mutex_unlock( &this->refresh_mutex );
 244                 if ( this->thread )
 245                         pthread_join( this->thread, NULL );
 246                 this->joined = 1;
 247
 248                 if ( app_locked && lock ) lock( );
 249
 250                 pthread_mutex_lock( &mlt_sdl_mutex );
 251                 SDL_Quit( );
 252                 pthread_mutex_unlock( &mlt_sdl_mutex );
 253         }
 254
 255         return 0;
 256 }
 257
 258 static int consumer_is_stopped( mlt_consumer parent )
 259 {
 260         consumer_sdl this = parent->child;
 261         return !this->running;
 262 }
 263
 264 static void *consumer_thread( void *arg )
 265 {
 266         // Identify the arg
 267         consumer_sdl this = arg;
 268
 269         // Get the consumer
 270         mlt_consumer consumer = &this->parent;
 271
 272         // Get the properties
 273         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 274
 275         // internal intialization
 276         int first = 1;
 277         mlt_frame frame = NULL;
 278         int last_position = -1;
 279
 280         // Determine if the application is dealing with the preview
 281         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 282
 283         this->refresh_count = 0;
 284
 285         // Loop until told not to
 286         while( this->running )
 287         {
 288                 // Get a frame from the attached producer
 289                 frame = mlt_consumer_get_frame( consumer );
 290
 291                 // Ensure that we have a frame
 292                 if ( this->running && frame != NULL )
 293                 {
 294                         // Get the speed of the frame
 295                         double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" );
 296
 297                         // Lock during the operation
 298                         mlt_service_lock( MLT_CONSUMER_SERVICE( consumer ) );
 299
 300                         // Get refresh request for the current frame
 301                         int refresh = mlt_properties_get_int( properties, "refresh" );
 302
 303                         // Decrement refresh and clear changed
 304                         mlt_events_block( properties, properties );
 305                         mlt_properties_set_int( properties, "refresh", 0 );
 306                         mlt_events_unblock( properties, properties );
 307
 308                         // Unlock after the operation
 309                         mlt_service_unlock( MLT_CONSUMER_SERVICE( consumer ) );
 310
 311                         // Set the changed property on this frame for the benefit of still
 312                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "refresh", refresh );
 313
 314                         // Make sure the recipient knows that this frame isn't really rendered
 315                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 0 );
 316
 317                         // Optimisation to reduce latency
 318                         if ( speed == 1.0 )
 319                         {
 320                                 if ( last_position != -1 && last_position + 1 != mlt_frame_get_position( frame ) )
 321                                         mlt_consumer_purge( this->play );
 322                                 last_position = mlt_frame_get_position( frame );
 323                         }
 324                         else
 325                         {
 326                                 //mlt_consumer_purge( this->play );
 327                                 last_position = -1;
 328                         }
 329
 330                         // If we're not the first frame and both consumers are stopped, then stop ourselves
 331                         if ( !first && mlt_consumer_is_stopped( this->play ) && mlt_consumer_is_stopped( this->still ) )
 332                         {
 333                                 this->running = 0;
 334                                 mlt_frame_close( frame );
 335                         }
 336                         // Allow a little grace time before switching consumers on speed changes
 337                         else if ( this->ignore_change -- > 0 && this->active != NULL && !mlt_consumer_is_stopped( this->active ) )
 338                         {
 339                                 mlt_consumer_put_frame( this->active, frame );
 340                         }
 341                         // If we aren't playing normally, then use the still
 342                         else if ( speed != 1 )
 343                         {
 344                                 if ( !mlt_consumer_is_stopped( this->play ) )
 345                                         mlt_consumer_stop( this->play );
 346                                 if ( mlt_consumer_is_stopped( this->still ) )
 347                                 {
 348                                         this->last_speed = speed;
 349                                         this->active = this->still;
 350                                         this->ignore_change = 0;
 351                                         mlt_consumer_start( this->still );
 352                                 }
 353                                 mlt_consumer_put_frame( this->still, frame );
 354                         }
 355                         // Otherwise use the normal player
 356                         else
 357                         {
 358                                 if ( !mlt_consumer_is_stopped( this->still ) )
 359                                         mlt_consumer_stop( this->still );
 360                                 if ( mlt_consumer_is_stopped( this->play ) )
 361                                 {
 362                                         this->last_speed = speed;
 363                                         this->active = this->play;
 364                                         this->ignore_change = 25;
 365                                         mlt_consumer_start( this->play );
 366                                 }
 367                                 mlt_consumer_put_frame( this->play, frame );
 368                         }
 369
 370                         // Copy the rectangle info from the active consumer
 371                         if ( this->running && preview_off == 0 )
 372                         {
 373                                 mlt_properties active = MLT_CONSUMER_PROPERTIES( this->active );
 374                                 mlt_service_lock( MLT_CONSUMER_SERVICE( consumer ) );
 375                                 mlt_properties_set_int( properties, "rect_x", mlt_properties_get_int( active, "rect_x" ) );
 376                                 mlt_properties_set_int( properties, "rect_y", mlt_properties_get_int( active, "rect_y" ) );
 377                                 mlt_properties_set_int( properties, "rect_w", mlt_properties_get_int( active, "rect_w" ) );
 378                                 mlt_properties_set_int( properties, "rect_h", mlt_properties_get_int( active, "rect_h" ) );
 379                                 mlt_service_unlock( MLT_CONSUMER_SERVICE( consumer ) );
 380                         }
 381
 382                         if ( this->active == this->still )
 383                         {
 384                                 pthread_mutex_lock( &this->refresh_mutex );
 385                                 if ( this->running && speed == 0 && this->refresh_count <= 0 )
 386                                         pthread_cond_wait( &this->refresh_cond, &this->refresh_mutex );
 387                                 this->refresh_count --;
 388                                 pthread_mutex_unlock( &this->refresh_mutex );
 389                         }
 390
 391                         // We are definitely not waiting on the first frame any more
 392                         first = 0;
 393                 }
 394                 else
 395                 {
 396                         if ( frame ) mlt_frame_close( frame );
 397                         mlt_consumer_put_frame( this->active, NULL );
 398                         this->running = 0;
 399                 }
 400         }
 401
 402         if ( this->play ) mlt_consumer_stop( this->play );
 403         if ( this->still ) mlt_consumer_stop( this->still );
 404
 405         return NULL;
 406 }
 407
 408 /** Callback to allow override of the close method.
 409 */
 410
 411 static void consumer_close( mlt_consumer parent )
 412 {
 413         // Get the actual object
 414         consumer_sdl this = parent->child;
 415
 416         // Stop the consumer
 417         mlt_consumer_stop( parent );
 418
 419         // Close the child consumers
 420         mlt_consumer_close( this->play );
 421         mlt_consumer_close( this->still );
 422
 423         // Now clean up the rest
 424         mlt_consumer_close( parent );
 425
 426         // Finally clean up this
 427         free( this );
 428 }