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 <pthread.h>
  27 #include <SDL/SDL.h>
  28 #include <SDL/SDL_syswm.h>
  29
  30 typedef struct consumer_sdl_s *consumer_sdl;
  31
  32 struct consumer_sdl_s
  33 {
  34         struct mlt_consumer_s parent;
  35         mlt_consumer active;
  36         int ignore_change;
  37         mlt_consumer play;
  38         mlt_consumer still;
  39         pthread_t thread;
  40         int joined;
  41         int running;
  42         int sdl_flags;
  43         double last_speed;
  44 };
  45
  46 /** Forward references to static functions.
  47 */
  48
  49 static int consumer_start( mlt_consumer parent );
  50 static int consumer_stop( mlt_consumer parent );
  51 static int consumer_is_stopped( mlt_consumer parent );
  52 static void consumer_close( mlt_consumer parent );
  53 static void *consumer_thread( void * );
  54 static void consumer_frame_show_cb( mlt_consumer sdl, mlt_consumer this, mlt_frame frame );
  55 static void consumer_sdl_event_cb( mlt_consumer sdl, mlt_consumer this, SDL_Event *event );
  56
  57 mlt_consumer consumer_sdl_preview_init( char *arg )
  58 {
  59         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  60         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  61         {
  62                 // Get the parent consumer object
  63                 mlt_consumer parent = &this->parent;
  64
  65                 // Get the properties
  66                 mlt_properties properties = mlt_consumer_properties( parent );
  67
  68                 // Get the width and height
  69                 int width = mlt_properties_get_int( properties, "width" );
  70                 int height = mlt_properties_get_int( properties, "height" );
  71
  72                 // Process actual param
  73                 if ( arg == NULL || sscanf( arg, "%dx%d", &width, &height ) == 2 )
  74                 {
  75                         mlt_properties_set_int( properties, "width", width );
  76                         mlt_properties_set_int( properties, "height", height );
  77                 }
  78
  79                 // Create child consumers
  80                 this->play = mlt_factory_consumer( "sdl", arg );
  81                 this->still = mlt_factory_consumer( "sdl_still", arg );
  82                 mlt_properties_set( mlt_consumer_properties( parent ), "real_time", "0" );
  83                 mlt_properties_set( mlt_consumer_properties( parent ), "rescale", "nearest" );
  84                 parent->close = consumer_close;
  85                 parent->start = consumer_start;
  86                 parent->stop = consumer_stop;
  87                 parent->is_stopped = consumer_is_stopped;
  88                 this->joined = 1;
  89                 mlt_events_listen( mlt_consumer_properties( this->play ), this, "consumer-frame-show", ( mlt_listener )consumer_frame_show_cb );
  90                 mlt_events_listen( mlt_consumer_properties( this->still ), this, "consumer-frame-show", ( mlt_listener )consumer_frame_show_cb );
  91                 mlt_events_listen( mlt_consumer_properties( this->play ), this, "consumer-sdl-event", ( mlt_listener )consumer_sdl_event_cb );
  92                 mlt_events_listen( mlt_consumer_properties( this->still ), this, "consumer-sdl-event", ( mlt_listener )consumer_sdl_event_cb );
  93                 return parent;
  94         }
  95         free( this );
  96         return NULL;
  97 }
  98
  99 void consumer_frame_show_cb( mlt_consumer sdl, mlt_consumer parent, mlt_frame frame )
 100 {
 101         consumer_sdl this = parent->child;
 102         this->last_speed = mlt_properties_get_double( mlt_frame_properties( frame ), "_speed" );
 103         mlt_events_fire( mlt_consumer_properties( parent ), "consumer-frame-show", frame, NULL );
 104 }
 105
 106 static void consumer_sdl_event_cb( mlt_consumer sdl, mlt_consumer parent, SDL_Event *event )
 107 {
 108         mlt_events_fire( mlt_consumer_properties( parent ), "consumer-sdl-event", event, NULL );
 109 }
 110
 111 static int consumer_start( mlt_consumer parent )
 112 {
 113         consumer_sdl this = parent->child;
 114
 115         if ( !this->running )
 116         {
 117                 pthread_attr_t thread_attributes;
 118
 119                 consumer_stop( parent );
 120
 121                 this->running = 1;
 122                 this->joined = 0;
 123                 this->last_speed = 1;
 124
 125                 // Inherit the scheduling priority
 126                 pthread_attr_init( &thread_attributes );
 127                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 128
 129                 pthread_create( &this->thread, &thread_attributes, consumer_thread, this );
 130         }
 131
 132         return 0;
 133 }
 134
 135 static int consumer_stop( mlt_consumer parent )
 136 {
 137         // Get the actual object
 138         consumer_sdl this = parent->child;
 139
 140         if ( this->joined == 0 )
 141         {
 142                 // Kill the thread and clean up
 143                 this->running = 0;
 144
 145                 pthread_join( this->thread, NULL );
 146                 this->joined = 1;
 147         }
 148
 149         return 0;
 150 }
 151
 152 static int consumer_is_stopped( mlt_consumer parent )
 153 {
 154         consumer_sdl this = parent->child;
 155         return !this->running;
 156 }
 157
 158 static void *consumer_thread( void *arg )
 159 {
 160         // Identify the arg
 161         consumer_sdl this = arg;
 162
 163         // Get the consumer
 164         mlt_consumer consumer = &this->parent;
 165
 166         // internal intialization
 167         int first = 1;
 168         mlt_frame frame = NULL;
 169
 170         // properties
 171         mlt_properties properties = mlt_consumer_properties( consumer );
 172         mlt_properties play = mlt_consumer_properties( this->play );
 173         mlt_properties still = mlt_consumer_properties( this->still );
 174
 175         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE ) < 0 )
 176         {
 177                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 178                 return NULL;
 179         }
 180
 181         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 182         SDL_EnableUNICODE( 1 );
 183
 184         // Inform child consumers that we control the sdl
 185         mlt_properties_set_int( play, "sdl_started", 1 );
 186         mlt_properties_set_int( still, "sdl_started", 1 );
 187
 188         // Pass properties down
 189         mlt_properties_set_data( play, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
 190         mlt_properties_set_data( still, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
 191         mlt_properties_set_data( play, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
 192         mlt_properties_set_data( still, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
 193         mlt_properties_set( play, "rescale", mlt_properties_get( properties, "rescale" ) );
 194         mlt_properties_set( still, "rescale", mlt_properties_get( properties, "rescale" ) );
 195         mlt_properties_set( play, "width", mlt_properties_get( properties, "width" ) );
 196         mlt_properties_set( still, "width", mlt_properties_get( properties, "width" ) );
 197         mlt_properties_set( play, "height", mlt_properties_get( properties, "height" ) );
 198         mlt_properties_set( still, "height", mlt_properties_get( properties, "height" ) );
 199
 200         mlt_properties_set_int( play, "progressive", 1 );
 201         mlt_properties_set_int( still, "progressive", 1 );
 202
 203         mlt_properties_pass( play, mlt_consumer_properties( consumer ), "play." );
 204         mlt_properties_pass( still, mlt_consumer_properties( consumer ), "still." );
 205
 206         mlt_properties_set_data( play, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
 207         mlt_properties_set_data( still, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
 208         mlt_properties_set_data( play, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
 209         mlt_properties_set_data( still, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
 210
 211         mlt_properties_set_int( play, "put_mode", 1 );
 212         mlt_properties_set_int( still, "put_mode", 1 );
 213
 214         // Loop until told not to
 215         while( this->running )
 216         {
 217                 // Get a frame from the attached producer
 218                 frame = mlt_consumer_get_frame( consumer );
 219
 220                 // Ensure that we have a frame
 221                 if ( frame != NULL )
 222                 {
 223                         // Get the speed of the frame
 224                         double speed = mlt_properties_get_double( mlt_frame_properties( frame ), "_speed" );
 225
 226                         // Determine which speed to use
 227                         double use_speed = first ? speed : this->last_speed;
 228
 229                         // Get changed requests to the preview (focus changes)
 230                         int changed = mlt_properties_get_int( properties, "changed" );
 231
 232                         // Get refresh request for the current frame (effect changes in still mode)
 233                         int refresh = mlt_properties_get_int( properties, "refresh" );
 234
 235                         // Decrement refresh and clear changed
 236                         mlt_properties_set_int( properties, "refresh", refresh > 0 ? refresh - 1 : 0 );
 237                         mlt_properties_set_int( properties, "changed", 0 );
 238
 239                         // Set the changed property on this frame for the benefit of still
 240                         mlt_properties_set_int( mlt_frame_properties( frame ), "refresh", refresh );
 241
 242                         // Make sure the recipient knows that this frame isn't really rendered
 243                         mlt_properties_set_int( mlt_frame_properties( frame ), "rendered", 0 );
 244
 245                         // If we're not the first frame and both consumers are stopped, then stop ourselves
 246                         if ( !first && mlt_consumer_is_stopped( this->play ) && mlt_consumer_is_stopped( this->still ) )
 247                         {
 248                                 this->running = 0;
 249                                 mlt_frame_close( frame );
 250                         }
 251                         // Allow a little grace time before switching consumers on speed changes
 252                         else if ( this->ignore_change -- > 0 && this->active != NULL && !mlt_consumer_is_stopped( this->active ) )
 253                         {
 254                                 mlt_consumer_put_frame( this->active, frame );
 255                                 mlt_properties_set_int( still, "changed", changed );
 256                         }
 257                         // If we aren't playing normally, then use the still
 258                         else if ( use_speed != 1 )
 259                         {
 260                                 if ( !mlt_consumer_is_stopped( this->play ) )
 261                                         mlt_consumer_stop( this->play );
 262                                 if ( mlt_consumer_is_stopped( this->still ) )
 263                                 {
 264                                         this->last_speed = use_speed;
 265                                         this->active = this->still;
 266                                         mlt_consumer_start( this->still );
 267                                 }
 268                                 mlt_properties_set_int( still, "changed", changed );
 269                                 mlt_consumer_put_frame( this->still, frame );
 270                         }
 271                         // Otherwise use the normal player
 272                         else
 273                         {
 274                                 if ( !mlt_consumer_is_stopped( this->still ) )
 275                                         mlt_consumer_stop( this->still );
 276                                 if ( mlt_consumer_is_stopped( this->play ) )
 277                                 {
 278                                         this->last_speed = use_speed;
 279                                         this->active = this->play;
 280                                         this->ignore_change = 25;
 281                                         mlt_consumer_start( this->play );
 282                                 }
 283                                 mlt_properties_set_int( still, "changed", changed );
 284                                 mlt_consumer_put_frame( this->play, frame );
 285                         }
 286
 287                         // Copy the rectangle info from the active consumer
 288                         if ( this->running )
 289                         {
 290                                 mlt_properties active = mlt_consumer_properties( this->active );
 291                                 mlt_properties_set_int( properties, "rect_x", mlt_properties_get_int( active, "rect_x" ) );
 292                                 mlt_properties_set_int( properties, "rect_y", mlt_properties_get_int( active, "rect_y" ) );
 293                                 mlt_properties_set_int( properties, "rect_w", mlt_properties_get_int( active, "rect_w" ) );
 294                                 mlt_properties_set_int( properties, "rect_h", mlt_properties_get_int( active, "rect_h" ) );
 295                         }
 296
 297                         // We are definitely not waiting on the first frame any more
 298                         first = 0;
 299                 }
 300         }
 301
 302         mlt_consumer_stop( this->play );
 303         mlt_consumer_stop( this->still );
 304
 305         SDL_Quit( );
 306
 307         return NULL;
 308 }
 309
 310 /** Callback to allow override of the close method.
 311 */
 312
 313 static void consumer_close( mlt_consumer parent )
 314 {
 315         // Get the actual object
 316         consumer_sdl this = parent->child;
 317
 318         // Stop the consumer
 319         mlt_consumer_stop( parent );
 320
 321         // Now clean up the rest
 322         mlt_consumer_close( parent );
 323
 324         // Close the child consumers
 325         mlt_consumer_close( this->play );
 326         mlt_consumer_close( this->still );
 327
 328         // Finally clean up this
 329         free( this );
 330 }