research.m1stereo.tv/gitweb/ - melted/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 };
  49
  50 /** Forward references to static functions.
  51 */
  52
  53 static int consumer_start( mlt_consumer parent );
  54 static int consumer_stop( mlt_consumer parent );
  55 static int consumer_is_stopped( mlt_consumer parent );
  56 static void consumer_close( mlt_consumer parent );
  57 static void *consumer_thread( void * );
  58 static void consumer_frame_show_cb( mlt_consumer sdl, mlt_consumer this, mlt_frame frame );
  59 static void consumer_sdl_event_cb( mlt_consumer sdl, mlt_consumer this, SDL_Event *event );
  60 static void consumer_refresh_cb( mlt_consumer sdl, mlt_consumer this, char *name );
  61
  62 mlt_consumer consumer_sdl_preview_init( char *arg )
  63 {
  64         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  65         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  66         {
  67                 // Get the parent consumer object
  68                 mlt_consumer parent = &this->parent;
  69
  70                 // Get the properties
  71                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( parent );
  72
  73                 // Get the width and height
  74                 int width = mlt_properties_get_int( properties, "width" );
  75                 int height = mlt_properties_get_int( properties, "height" );
  76
  77                 // Process actual param
  78                 if ( arg == NULL || sscanf( arg, "%dx%d", &width, &height ) == 2 )
  79                 {
  80                         mlt_properties_set_int( properties, "width", width );
  81                         mlt_properties_set_int( properties, "height", height );
  82                 }
  83
  84                 // Create child consumers
  85                 this->play = mlt_factory_consumer( "sdl", arg );
  86                 this->still = mlt_factory_consumer( "sdl_still", arg );
  87                 mlt_properties_set( MLT_CONSUMER_PROPERTIES( parent ), "real_time", "0" );
  88                 mlt_properties_set( MLT_CONSUMER_PROPERTIES( parent ), "rescale", "nearest" );
  89                 parent->close = consumer_close;
  90                 parent->start = consumer_start;
  91                 parent->stop = consumer_stop;
  92                 parent->is_stopped = consumer_is_stopped;
  93                 this->joined = 1;
  94                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( this->play ), this, "consumer-frame-show", ( mlt_listener )consumer_frame_show_cb );
  95                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( this->still ), this, "consumer-frame-show", ( mlt_listener )consumer_frame_show_cb );
  96                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( this->play ), this, "consumer-sdl-event", ( mlt_listener )consumer_sdl_event_cb );
  97                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( this->still ), this, "consumer-sdl-event", ( mlt_listener )consumer_sdl_event_cb );
  98                 pthread_cond_init( &this->refresh_cond, NULL );
  99                 pthread_mutex_init( &this->refresh_mutex, NULL );
 100                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( parent ), this, "property-changed", ( mlt_listener )consumer_refresh_cb );
 101                 return parent;
 102         }
 103         free( this );
 104         return NULL;
 105 }
 106
 107 void consumer_frame_show_cb( mlt_consumer sdl, mlt_consumer parent, mlt_frame frame )
 108 {
 109         consumer_sdl this = parent->child;
 110         this->last_speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" );
 111         mlt_events_fire( MLT_CONSUMER_PROPERTIES( parent ), "consumer-frame-show", frame, NULL );
 112 }
 113
 114 static void consumer_sdl_event_cb( mlt_consumer sdl, mlt_consumer parent, SDL_Event *event )
 115 {
 116         mlt_events_fire( MLT_CONSUMER_PROPERTIES( parent ), "consumer-sdl-event", event, NULL );
 117 }
 118
 119 static void consumer_refresh_cb( mlt_consumer sdl, mlt_consumer parent, char *name )
 120 {
 121         if ( !strcmp( name, "refresh" ) )
 122         {
 123                 consumer_sdl this = parent->child;
 124                 if ( mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "refresh" ) )
 125                 {
 126                         pthread_mutex_lock( &this->refresh_mutex );
 127                         pthread_cond_broadcast( &this->refresh_cond );
 128                         pthread_mutex_unlock( &this->refresh_mutex );
 129                 }
 130         }
 131 }
 132
 133 static int consumer_start( mlt_consumer parent )
 134 {
 135         consumer_sdl this = parent->child;
 136
 137         if ( !this->running )
 138         {
 139                 pthread_attr_t thread_attributes;
 140
 141                 consumer_stop( parent );
 142
 143                 this->running = 1;
 144                 this->joined = 0;
 145                 this->last_speed = 1;
 146
 147                 // Inherit the scheduling priority
 148                 pthread_attr_init( &thread_attributes );
 149                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 150
 151                 pthread_create( &this->thread, &thread_attributes, consumer_thread, this );
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int consumer_stop( mlt_consumer parent )
 158 {
 159         // Get the actual object
 160         consumer_sdl this = parent->child;
 161
 162         if ( this->joined == 0 )
 163         {
 164                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( parent );
 165                 int app_locked = mlt_properties_get_int( properties, "app_locked" );
 166                 void ( *lock )( void ) = mlt_properties_get_data( properties, "app_lock", NULL );
 167                 void ( *unlock )( void ) = mlt_properties_get_data( properties, "app_unlock", NULL );
 168
 169                 if ( app_locked && unlock ) unlock( );
 170
 171                 // Kill the thread and clean up
 172                 this->running = 0;
 173
 174                 pthread_mutex_lock( &this->refresh_mutex );
 175                 pthread_cond_broadcast( &this->refresh_cond );
 176                 pthread_mutex_unlock( &this->refresh_mutex );
 177
 178                 if ( this->play ) mlt_consumer_stop( this->play );
 179                 if ( this->still ) mlt_consumer_stop( this->still );
 180
 181                 pthread_join( this->thread, NULL );
 182                 this->joined = 1;
 183
 184                 if ( app_locked && lock ) lock( );
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int consumer_is_stopped( mlt_consumer parent )
 191 {
 192         consumer_sdl this = parent->child;
 193         return !this->running;
 194 }
 195
 196 static void *consumer_thread( void *arg )
 197 {
 198         // Identify the arg
 199         consumer_sdl this = arg;
 200
 201         // Get the consumer
 202         mlt_consumer consumer = &this->parent;
 203
 204         // internal intialization
 205         int first = 1;
 206         mlt_frame frame = NULL;
 207         int last_position = -1;
 208
 209         // properties
 210         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 211         mlt_properties play = MLT_CONSUMER_PROPERTIES( this->play );
 212         mlt_properties still = MLT_CONSUMER_PROPERTIES( this->still );
 213
 214         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE ) < 0 )
 215         {
 216                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 217                 return NULL;
 218         }
 219
 220         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 221         SDL_EnableUNICODE( 1 );
 222
 223         // Inform child consumers that we control the sdl
 224         mlt_properties_set_int( play, "sdl_started", 1 );
 225         mlt_properties_set_int( still, "sdl_started", 1 );
 226
 227         // Pass properties down
 228         mlt_properties_set_data( play, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
 229         mlt_properties_set_data( still, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
 230         mlt_properties_set_data( play, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
 231         mlt_properties_set_data( still, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
 232         mlt_properties_set_int( play, "resize", mlt_properties_get_int( properties, "resize" ) );
 233         mlt_properties_set_int( still, "resize", mlt_properties_get_int( properties, "resize" ) );
 234         mlt_properties_set( play, "rescale", mlt_properties_get( properties, "rescale" ) );
 235         mlt_properties_set( still, "rescale", mlt_properties_get( properties, "rescale" ) );
 236         mlt_properties_set_int( play, "width", mlt_properties_get_int( properties, "width" ) );
 237         mlt_properties_set_int( still, "width", mlt_properties_get_int( properties, "width" ) );
 238         mlt_properties_set_int( play, "height", mlt_properties_get_int( properties, "height" ) );
 239         mlt_properties_set_int( still, "height", mlt_properties_get_int( properties, "height" ) );
 240
 241         mlt_properties_set_int( play, "progressive", 1 );
 242         mlt_properties_set_int( still, "progressive", 1 );
 243
 244         mlt_properties_pass( play, MLT_CONSUMER_PROPERTIES( consumer ), "play." );
 245         mlt_properties_pass( still, MLT_CONSUMER_PROPERTIES( consumer ), "still." );
 246
 247         mlt_properties_set_data( play, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
 248         mlt_properties_set_data( still, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
 249         mlt_properties_set_data( play, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
 250         mlt_properties_set_data( still, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
 251
 252         mlt_properties_set_int( play, "put_mode", 1 );
 253         mlt_properties_set_int( still, "put_mode", 1 );
 254
 255         // Loop until told not to
 256         while( this->running )
 257         {
 258                 // Get a frame from the attached producer
 259                 frame = mlt_consumer_get_frame( consumer );
 260
 261                 // Ensure that we have a frame
 262                 if ( frame != NULL )
 263                 {
 264                         // Get the speed of the frame
 265                         double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" );
 266
 267                         // Determine which speed to use
 268                         double use_speed = speed;
 269
 270                         // Get refresh request for the current frame (effect changes in still mode)
 271                         int refresh = mlt_properties_get_int( properties, "refresh" );
 272
 273                         // Decrement refresh and clear changed
 274                         mlt_properties_set_int( properties, "refresh", refresh > 0 ? refresh - 1 : 0 );
 275
 276                         // Set the changed property on this frame for the benefit of still
 277                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "refresh", refresh );
 278
 279                         // Make sure the recipient knows that this frame isn't really rendered
 280                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 0 );
 281
 282                         // Optimisation to reduce latency
 283                         if ( speed == 1.0 )
 284                         {
 285                                 //if ( last_position != -1 && last_position + 1 != mlt_frame_get_position( frame ) )
 286                                         //mlt_consumer_purge( this->play );
 287                                 last_position = mlt_frame_get_position( frame );
 288                         }
 289                         else
 290                         {
 291                                 last_position = -1;
 292                         }
 293
 294                         // If we're not the first frame and both consumers are stopped, then stop ourselves
 295                         if ( !first && mlt_consumer_is_stopped( this->play ) && mlt_consumer_is_stopped( this->still ) )
 296                         {
 297                                 this->running = 0;
 298                                 mlt_frame_close( frame );
 299                         }
 300                         // Allow a little grace time before switching consumers on speed changes
 301                         else if ( this->ignore_change -- > 0 && this->active != NULL && !mlt_consumer_is_stopped( this->active ) )
 302                         {
 303                                 mlt_consumer_put_frame( this->active, frame );
 304                         }
 305                         // If we aren't playing normally, then use the still
 306                         else if ( use_speed != 1 )
 307                         {
 308                                 if ( !mlt_consumer_is_stopped( this->play ) )
 309                                         mlt_consumer_stop( this->play );
 310                                 if ( mlt_consumer_is_stopped( this->still ) )
 311                                 {
 312                                         this->last_speed = use_speed;
 313                                         this->active = this->still;
 314                                         this->ignore_change = 0;
 315                                         mlt_consumer_start( this->still );
 316                                 }
 317                                 mlt_consumer_put_frame( this->still, frame );
 318                         }
 319                         // Otherwise use the normal player
 320                         else
 321                         {
 322                                 if ( !mlt_consumer_is_stopped( this->still ) )
 323                                         mlt_consumer_stop( this->still );
 324                                 if ( mlt_consumer_is_stopped( this->play ) )
 325                                 {
 326                                         this->last_speed = use_speed;
 327                                         this->active = this->play;
 328                                         this->ignore_change = 25;
 329                                         mlt_consumer_start( this->play );
 330                                 }
 331                                 mlt_consumer_put_frame( this->play, frame );
 332                         }
 333
 334                         // Copy the rectangle info from the active consumer
 335                         if ( this->running )
 336                         {
 337                                 mlt_properties active = MLT_CONSUMER_PROPERTIES( this->active );
 338                                 mlt_properties_set_int( properties, "rect_x", mlt_properties_get_int( active, "rect_x" ) );
 339                                 mlt_properties_set_int( properties, "rect_y", mlt_properties_get_int( active, "rect_y" ) );
 340                                 mlt_properties_set_int( properties, "rect_w", mlt_properties_get_int( active, "rect_w" ) );
 341                                 mlt_properties_set_int( properties, "rect_h", mlt_properties_get_int( active, "rect_h" ) );
 342                         }
 343
 344                         if ( this->active == this->still )
 345                         {
 346                                 pthread_mutex_lock( &this->refresh_mutex );
 347                                 if ( speed == 0 && mlt_properties_get_int( properties, "refresh" ) == 0 )
 348                                         pthread_cond_wait( &this->refresh_cond, &this->refresh_mutex );
 349                                 pthread_mutex_unlock( &this->refresh_mutex );
 350                         }
 351
 352                         // We are definitely not waiting on the first frame any more
 353                         first = 0;
 354                 }
 355         }
 356
 357         mlt_consumer_stop( this->play );
 358         mlt_consumer_stop( this->still );
 359
 360         SDL_Quit( );
 361
 362         return NULL;
 363 }
 364
 365 /** Callback to allow override of the close method.
 366 */
 367
 368 static void consumer_close( mlt_consumer parent )
 369 {
 370         // Get the actual object
 371         consumer_sdl this = parent->child;
 372
 373         // Stop the consumer
 374         mlt_consumer_stop( parent );
 375
 376         // Now clean up the rest
 377         mlt_consumer_close( parent );
 378
 379         // Close the child consumers
 380         mlt_consumer_close( this->play );
 381         mlt_consumer_close( this->still );
 382
 383         // Finally clean up this
 384         free( this );
 385 }