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