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 play;
  36         mlt_consumer still;
  37         pthread_t thread;
  38         int joined;
  39         int running;
  40         int sdl_flags;
  41         double last_speed;
  42 };
  43
  44 /** Forward references to static functions.
  45 */
  46
  47 static int consumer_start( mlt_consumer parent );
  48 static int consumer_stop( mlt_consumer parent );
  49 static int consumer_is_stopped( mlt_consumer parent );
  50 static void consumer_close( mlt_consumer parent );
  51 static void *consumer_thread( void * );
  52 static void consumer_frame_show_cb( mlt_consumer sdl, mlt_consumer this, mlt_frame frame );
  53
  54 mlt_consumer consumer_sdl_preview_init( char *arg )
  55 {
  56         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  57         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  58         {
  59                 // Get the parent consumer object
  60                 mlt_consumer parent = &this->parent;
  61                 this->play = mlt_factory_consumer( "sdl", arg );
  62                 this->still = mlt_factory_consumer( "sdl_still", arg );
  63                 mlt_properties_set( mlt_consumer_properties( parent ), "real_time", "0" );
  64                 parent->close = consumer_close;
  65                 parent->start = consumer_start;
  66                 parent->stop = consumer_stop;
  67                 parent->is_stopped = consumer_is_stopped;
  68                 this->joined = 1;
  69                 mlt_events_listen( mlt_consumer_properties( this->play ), this, "consumer-frame-show", ( mlt_listener )consumer_frame_show_cb );
  70                 mlt_events_listen( mlt_consumer_properties( this->still ), this, "consumer-frame-show", ( mlt_listener )consumer_frame_show_cb );
  71                 return parent;
  72         }
  73         free( this );
  74         return NULL;
  75 }
  76
  77 void consumer_frame_show_cb( mlt_consumer sdl, mlt_consumer parent, mlt_frame frame )
  78 {
  79         consumer_sdl this = parent->child;
  80         this->last_speed = mlt_properties_get_double( mlt_frame_properties( frame ), "_speed" );
  81         mlt_events_fire( mlt_consumer_properties( parent ), "consumer-frame-show", frame, NULL );
  82 }
  83
  84 static int consumer_start( mlt_consumer parent )
  85 {
  86         consumer_sdl this = parent->child;
  87
  88         if ( !this->running )
  89         {
  90                 pthread_attr_t thread_attributes;
  91
  92                 consumer_stop( parent );
  93
  94                 this->running = 1;
  95                 this->joined = 0;
  96                 this->last_speed = 1;
  97
  98                 // Inherit the scheduling priority
  99                 pthread_attr_init( &thread_attributes );
 100                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 101
 102                 pthread_create( &this->thread, &thread_attributes, consumer_thread, this );
 103         }
 104
 105         return 0;
 106 }
 107
 108 static int consumer_stop( mlt_consumer parent )
 109 {
 110         // Get the actual object
 111         consumer_sdl this = parent->child;
 112
 113         if ( this->joined == 0 )
 114         {
 115                 // Kill the thread and clean up
 116                 this->running = 0;
 117
 118                 pthread_join( this->thread, NULL );
 119                 this->joined = 1;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static int consumer_is_stopped( mlt_consumer parent )
 126 {
 127         consumer_sdl this = parent->child;
 128         return !this->running;
 129 }
 130
 131 static void *consumer_thread( void *arg )
 132 {
 133         // Identify the arg
 134         consumer_sdl this = arg;
 135
 136         // Get the consumer
 137         mlt_consumer consumer = &this->parent;
 138
 139         // internal intialization
 140         int first = 1;
 141         mlt_frame frame = NULL;
 142
 143         // properties
 144         mlt_properties properties = mlt_consumer_properties( consumer );
 145         mlt_properties play = mlt_consumer_properties( this->play );
 146         mlt_properties still = mlt_consumer_properties( this->still );
 147
 148         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE ) < 0 )
 149         {
 150                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 151                 return NULL;
 152         }
 153
 154         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 155         SDL_EnableUNICODE( 1 );
 156
 157         // Inform child consumers that we control the sdl
 158         mlt_properties_set_int( play, "sdl_started", 1 );
 159         mlt_properties_set_int( still, "sdl_started", 1 );
 160
 161         // Pass properties down
 162         mlt_properties_set_data( play, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
 163         mlt_properties_set_data( still, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
 164         mlt_properties_set_data( play, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
 165         mlt_properties_set_data( still, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
 166         mlt_properties_set( play, "rescale", mlt_properties_get( properties, "rescale" ) );
 167         mlt_properties_set( still, "rescale", mlt_properties_get( properties, "rescale" ) );
 168         mlt_properties_set( play, "width", mlt_properties_get( properties, "width" ) );
 169         mlt_properties_set( still, "width", mlt_properties_get( properties, "width" ) );
 170         mlt_properties_set( play, "height", mlt_properties_get( properties, "height" ) );
 171         mlt_properties_set( still, "height", mlt_properties_get( properties, "height" ) );
 172
 173         mlt_properties_pass( play, mlt_consumer_properties( consumer ), "play." );
 174         mlt_properties_pass( still, mlt_consumer_properties( consumer ), "still." );
 175
 176         // Loop until told not to
 177         while( this->running )
 178         {
 179                 // Get a frame from the attached producer
 180                 frame = mlt_consumer_get_frame( consumer );
 181
 182                 // Ensure that we have a frame
 183                 if ( frame != NULL )
 184                 {
 185                         // Get the speed of the frame
 186                         double speed = mlt_properties_get_double( mlt_frame_properties( frame ), "_speed" );
 187
 188                         // Make sure the recipient knows that this frame isn't really rendered
 189                         mlt_properties_set_int( mlt_frame_properties( frame ), "rendered", 0 );
 190
 191                         if ( !first && mlt_consumer_is_stopped( this->play ) && mlt_consumer_is_stopped( this->still ) )
 192                         {
 193                                 this->running = 0;
 194                                 mlt_frame_close( frame );
 195                         }
 196                         else if ( this->last_speed != 1 )
 197                         {
 198                                 if ( !mlt_consumer_is_stopped( this->play ) )
 199                                         mlt_consumer_stop( this->play );
 200                                 if ( mlt_consumer_is_stopped( this->still ) )
 201                                 {
 202                                         this->last_speed = speed;
 203                                         mlt_consumer_start( this->still );
 204                                 }
 205                                 mlt_consumer_put_frame( this->still, frame );
 206                         }
 207                         else
 208                         {
 209                                 if ( !mlt_consumer_is_stopped( this->still ) )
 210                                         mlt_consumer_stop( this->still );
 211                                 if ( mlt_consumer_is_stopped( this->play ) )
 212                                 {
 213                                         this->last_speed = speed;
 214                                         mlt_consumer_start( this->play );
 215                                 }
 216                                 mlt_consumer_put_frame( this->play, frame );
 217                         }
 218                         first = 0;
 219                 }
 220         }
 221
 222         mlt_consumer_stop( this->play );
 223         mlt_consumer_stop( this->still );
 224
 225         SDL_Quit( );
 226
 227         return NULL;
 228 }
 229
 230 /** Callback to allow override of the close method.
 231 */
 232
 233 static void consumer_close( mlt_consumer parent )
 234 {
 235         // Get the actual object
 236         consumer_sdl this = parent->child;
 237
 238         // Stop the consumer
 239         mlt_consumer_stop( parent );
 240
 241         // Now clean up the rest
 242         mlt_consumer_close( parent );
 243
 244         // Close the child consumers
 245         mlt_consumer_close( this->play );
 246         mlt_consumer_close( this->still );
 247
 248         // Finally clean up this
 249         free( this );
 250 }