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                 pthread_attr_t thread_attributes;
 139
 140                 consumer_stop( parent );
 141
 142                 this->running = 1;
 143                 this->joined = 0;
 144                 this->last_speed = 1;
 145
 146                 // Inherit the scheduling priority
 147                 pthread_attr_init( &thread_attributes );
 148                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 149
 150                 pthread_create( &this->thread, &thread_attributes, consumer_thread, this );
 151         }
 152
 153         return 0;
 154 }
 155
 156 static int consumer_stop( mlt_consumer parent )
 157 {
 158         // Get the actual object
 159         consumer_sdl this = parent->child;
 160
 161         if ( this->joined == 0 )
 162         {
 163                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( parent );
 164                 int app_locked = mlt_properties_get_int( properties, "app_locked" );
 165                 void ( *lock )( void ) = mlt_properties_get_data( properties, "app_lock", NULL );
 166                 void ( *unlock )( void ) = mlt_properties_get_data( properties, "app_unlock", NULL );
 167
 168                 if ( app_locked && unlock ) unlock( );
 169
 170                 // Kill the thread and clean up
 171                 this->running = 0;
 172
 173                 pthread_mutex_lock( &this->refresh_mutex );
 174                 pthread_cond_broadcast( &this->refresh_cond );
 175                 pthread_mutex_unlock( &this->refresh_mutex );
 176
 177                 if ( this->play ) mlt_consumer_stop( this->play );
 178                 if ( this->still ) mlt_consumer_stop( this->still );
 179
 180                 pthread_join( this->thread, NULL );
 181                 this->joined = 1;
 182
 183                 if ( app_locked && lock ) lock( );
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int consumer_is_stopped( mlt_consumer parent )
 190 {
 191         consumer_sdl this = parent->child;
 192         return !this->running;
 193 }
 194
 195 static void *consumer_thread( void *arg )
 196 {
 197         // Identify the arg
 198         consumer_sdl this = arg;
 199
 200         // Get the consumer
 201         mlt_consumer consumer = &this->parent;
 202
 203         // internal intialization
 204         int first = 1;
 205         mlt_frame frame = NULL;
 206         int last_position = -1;
 207
 208         // properties
 209         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 210         mlt_properties play = MLT_CONSUMER_PROPERTIES( this->play );
 211         mlt_properties still = MLT_CONSUMER_PROPERTIES( this->still );
 212
 213         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE ) < 0 )
 214         {
 215                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 216                 return NULL;
 217         }
 218
 219         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 220         SDL_EnableUNICODE( 1 );
 221
 222         // Inform child consumers that we control the sdl
 223         mlt_properties_set_int( play, "sdl_started", 1 );
 224         mlt_properties_set_int( still, "sdl_started", 1 );
 225
 226         // Pass properties down
 227         mlt_properties_set_data( play, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
 228         mlt_properties_set_data( still, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
 229         mlt_properties_set_data( play, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
 230         mlt_properties_set_data( still, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
 231         mlt_properties_set_int( play, "resize", mlt_properties_get_int( properties, "resize" ) );
 232         mlt_properties_set_int( still, "resize", mlt_properties_get_int( properties, "resize" ) );
 233         mlt_properties_set( play, "rescale", mlt_properties_get( properties, "rescale" ) );
 234         mlt_properties_set( still, "rescale", mlt_properties_get( properties, "rescale" ) );
 235         mlt_properties_set_int( play, "width", mlt_properties_get_int( properties, "width" ) );
 236         mlt_properties_set_int( still, "width", mlt_properties_get_int( properties, "width" ) );
 237         mlt_properties_set_int( play, "height", mlt_properties_get_int( properties, "height" ) );
 238         mlt_properties_set_int( still, "height", mlt_properties_get_int( properties, "height" ) );
 239
 240         mlt_properties_set_int( play, "progressive", 1 );
 241         mlt_properties_set_int( still, "progressive", 1 );
 242
 243         mlt_properties_pass( play, MLT_CONSUMER_PROPERTIES( consumer ), "play." );
 244         mlt_properties_pass( still, MLT_CONSUMER_PROPERTIES( consumer ), "still." );
 245
 246         mlt_properties_set_data( play, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
 247         mlt_properties_set_data( still, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
 248         mlt_properties_set_data( play, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
 249         mlt_properties_set_data( still, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
 250
 251         mlt_properties_set_int( play, "put_mode", 1 );
 252         mlt_properties_set_int( still, "put_mode", 1 );
 253
 254         // Loop until told not to
 255         while( this->running )
 256         {
 257                 // Get a frame from the attached producer
 258                 frame = mlt_consumer_get_frame( consumer );
 259
 260                 // Ensure that we have a frame
 261                 if ( frame != NULL )
 262                 {
 263                         // Get the speed of the frame
 264                         double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" );
 265
 266                         // Determine which speed to use
 267                         double use_speed = speed;
 268
 269                         // Lock during the operation
 270                         mlt_service_lock( MLT_CONSUMER_SERVICE( consumer ) );
 271
 272                         // Get refresh request for the current frame
 273                         int refresh = mlt_properties_get_int( properties, "refresh" );
 274
 275                         // Decrement refresh and clear changed
 276                         mlt_events_block( properties, properties );
 277                         mlt_properties_set_int( properties, "refresh", 0 );
 278                         mlt_events_unblock( properties, properties );
 279
 280                         // Unlock after the operation
 281                         mlt_service_unlock( MLT_CONSUMER_SERVICE( consumer ) );
 282
 283                         // Set the changed property on this frame for the benefit of still
 284                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "refresh", refresh );
 285
 286                         // Make sure the recipient knows that this frame isn't really rendered
 287                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 0 );
 288
 289                         // Optimisation to reduce latency
 290                         if ( speed == 1.0 )
 291                         {
 292                                 if ( last_position != -1 && last_position + 1 != mlt_frame_get_position( frame ) )
 293                                         mlt_consumer_purge( this->play );
 294                                 last_position = mlt_frame_get_position( frame );
 295                         }
 296                         else
 297                         {
 298                                 //mlt_consumer_purge( this->play );
 299                                 last_position = -1;
 300                         }
 301
 302                         // If we're not the first frame and both consumers are stopped, then stop ourselves
 303                         if ( !first && mlt_consumer_is_stopped( this->play ) && mlt_consumer_is_stopped( this->still ) )
 304                         {
 305                                 this->running = 0;
 306                                 mlt_frame_close( frame );
 307                         }
 308                         // Allow a little grace time before switching consumers on speed changes
 309                         else if ( this->ignore_change -- > 0 && this->active != NULL && !mlt_consumer_is_stopped( this->active ) )
 310                         {
 311                                 mlt_consumer_put_frame( this->active, frame );
 312                         }
 313                         // If we aren't playing normally, then use the still
 314                         else if ( use_speed != 1 )
 315                         {
 316                                 if ( !mlt_consumer_is_stopped( this->play ) )
 317                                         mlt_consumer_stop( this->play );
 318                                 if ( mlt_consumer_is_stopped( this->still ) )
 319                                 {
 320                                         this->last_speed = use_speed;
 321                                         this->active = this->still;
 322                                         this->ignore_change = 0;
 323                                         mlt_consumer_start( this->still );
 324                                 }
 325                                 mlt_consumer_put_frame( this->still, frame );
 326                         }
 327                         // Otherwise use the normal player
 328                         else
 329                         {
 330                                 if ( !mlt_consumer_is_stopped( this->still ) )
 331                                         mlt_consumer_stop( this->still );
 332                                 if ( mlt_consumer_is_stopped( this->play ) )
 333                                 {
 334                                         this->last_speed = use_speed;
 335                                         this->active = this->play;
 336                                         this->ignore_change = 25;
 337                                         mlt_consumer_start( this->play );
 338                                 }
 339                                 mlt_consumer_put_frame( this->play, frame );
 340                         }
 341
 342                         // Copy the rectangle info from the active consumer
 343                         if ( this->running )
 344                         {
 345                                 mlt_properties active = MLT_CONSUMER_PROPERTIES( this->active );
 346                                 mlt_service_lock( MLT_CONSUMER_SERVICE( consumer ) );
 347                                 mlt_properties_set_int( properties, "rect_x", mlt_properties_get_int( active, "rect_x" ) );
 348                                 mlt_properties_set_int( properties, "rect_y", mlt_properties_get_int( active, "rect_y" ) );
 349                                 mlt_properties_set_int( properties, "rect_w", mlt_properties_get_int( active, "rect_w" ) );
 350                                 mlt_properties_set_int( properties, "rect_h", mlt_properties_get_int( active, "rect_h" ) );
 351                                 mlt_service_unlock( MLT_CONSUMER_SERVICE( consumer ) );
 352                         }
 353
 354                         if ( this->active == this->still )
 355                         {
 356                                 pthread_mutex_lock( &this->refresh_mutex );
 357                                 if ( speed == 0 && this->refresh_count <= 0 )
 358                                         pthread_cond_wait( &this->refresh_cond, &this->refresh_mutex );
 359                                 this->refresh_count --;
 360                                 pthread_mutex_unlock( &this->refresh_mutex );
 361                         }
 362
 363                         // We are definitely not waiting on the first frame any more
 364                         first = 0;
 365                 }
 366                 else
 367                 {
 368                         this->running = 0;
 369                 }
 370         }
 371
 372         //mlt_consumer_stop( this->play );
 373         //mlt_consumer_stop( this->still );
 374
 375         //SDL_Quit( );
 376
 377         return NULL;
 378 }
 379
 380 /** Callback to allow override of the close method.
 381 */
 382
 383 static void consumer_close( mlt_consumer parent )
 384 {
 385         // Get the actual object
 386         consumer_sdl this = parent->child;
 387
 388         // Stop the consumer
 389         mlt_consumer_stop( parent );
 390
 391         // Close the child consumers
 392         mlt_consumer_close( this->play );
 393         mlt_consumer_close( this->still );
 394
 395         // Now clean up the rest
 396         mlt_consumer_close( parent );
 397
 398         // Finally clean up this
 399         free( this );
 400 }