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[mlt] / 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                 mlt_properties_set_int( play, "resize", mlt_properties_get_int( properties, "resize" ) );
174                 mlt_properties_set_int( still, "resize", mlt_properties_get_int( properties, "resize" ) );
175                 mlt_properties_set( play, "rescale", mlt_properties_get( properties, "rescale" ) );
176                 mlt_properties_set( still, "rescale", mlt_properties_get( properties, "rescale" ) );
177                 mlt_properties_set_int( play, "width", mlt_properties_get_int( properties, "width" ) );
178                 mlt_properties_set_int( still, "width", mlt_properties_get_int( properties, "width" ) );
179                 mlt_properties_set_int( play, "height", mlt_properties_get_int( properties, "height" ) );
180                 mlt_properties_set_int( still, "height", mlt_properties_get_int( properties, "height" ) );
181                 mlt_properties_set_double( play, "aspect_ratio", mlt_properties_get_double( properties, "aspect_ratio" ) );
182                 mlt_properties_set_double( still, "aspect_ratio", mlt_properties_get_double( properties, "aspect_ratio" ) );
183                 mlt_properties_set_double( play, "display_ratio", mlt_properties_get_double( properties, "display_ratio" ) );
184                 mlt_properties_set_double( still, "display_ratio", mlt_properties_get_double( properties, "display_ratio" ) );
185
186                 mlt_properties_set_int( play, "progressive", progressive );
187                 mlt_properties_set_int( still, "progressive", progressive );
188                 mlt_properties_set( play, "deinterlace_method", mlt_properties_get( properties, "deinterlace_method" ) );
189                 mlt_properties_set( still, "deinterlace_method", mlt_properties_get( properties, "deinterlace_method" ) );
190
191                 mlt_properties_pass( play, properties, "play." );
192                 mlt_properties_pass( still, properties, "still." );
193
194                 mlt_properties_set_data( play, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
195                 mlt_properties_set_data( still, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
196                 mlt_properties_set_data( play, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
197                 mlt_properties_set_data( still, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
198
199                 mlt_properties_set_int( play, "put_mode", 1 );
200                 mlt_properties_set_int( still, "put_mode", 1 );
201
202                 // Start the still producer just to initialise the gui
203                 mlt_consumer_start( this->still );
204                 this->active = this->still;
205
206                 // Inform child consumers that we control the sdl
207                 mlt_properties_set_int( play, "sdl_started", 1 );
208                 mlt_properties_set_int( still, "sdl_started", 1 );
209
210                 pthread_create( &this->thread, NULL, consumer_thread, this );
211         }
212
213         return 0;
214 }
215
216 static int consumer_stop( mlt_consumer parent )
217 {
218         // Get the actual object
219         consumer_sdl this = parent->child;
220
221         if ( this->joined == 0 )
222         {
223                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( parent );
224                 int app_locked = mlt_properties_get_int( properties, "app_locked" );
225                 void ( *lock )( void ) = mlt_properties_get_data( properties, "app_lock", NULL );
226                 void ( *unlock )( void ) = mlt_properties_get_data( properties, "app_unlock", NULL );
227
228                 if ( app_locked && unlock ) unlock( );
229
230                 // Kill the thread and clean up
231                 this->running = 0;
232
233                 pthread_mutex_lock( &this->refresh_mutex );
234                 pthread_cond_broadcast( &this->refresh_cond );
235                 pthread_mutex_unlock( &this->refresh_mutex );
236
237                 pthread_join( this->thread, NULL );
238                 this->joined = 1;
239
240                 if ( app_locked && lock ) lock( );
241
242                 SDL_Quit( );
243         }
244
245         return 0;
246 }
247
248 static int consumer_is_stopped( mlt_consumer parent )
249 {
250         consumer_sdl this = parent->child;
251         return !this->running;
252 }
253
254 static void *consumer_thread( void *arg )
255 {
256         // Identify the arg
257         consumer_sdl this = arg;
258
259         // Get the consumer
260         mlt_consumer consumer = &this->parent;
261
262         // Get the properties
263         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
264
265         // internal intialization
266         int first = 1;
267         mlt_frame frame = NULL;
268         int last_position = -1;
269
270         this->refresh_count = 0;
271
272         // Loop until told not to
273         while( this->running )
274         {
275                 // Get a frame from the attached producer
276                 frame = mlt_consumer_get_frame( consumer );
277
278                 // Ensure that we have a frame
279                 if ( this->running && frame != NULL )
280                 {
281                         // Get the speed of the frame
282                         double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" );
283
284                         // Lock during the operation
285                         mlt_service_lock( MLT_CONSUMER_SERVICE( consumer ) );
286
287                         // Get refresh request for the current frame
288                         int refresh = mlt_properties_get_int( properties, "refresh" );
289
290                         // Decrement refresh and clear changed
291                         mlt_events_block( properties, properties );
292                         mlt_properties_set_int( properties, "refresh", 0 );
293                         mlt_events_unblock( properties, properties );
294
295                         // Unlock after the operation
296                         mlt_service_unlock( MLT_CONSUMER_SERVICE( consumer ) );
297
298                         // Set the changed property on this frame for the benefit of still
299                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "refresh", refresh );
300
301                         // Make sure the recipient knows that this frame isn't really rendered
302                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 0 );
303
304                         // Optimisation to reduce latency
305                         if ( speed == 1.0 )
306                         {
307                                 if ( last_position != -1 && last_position + 1 != mlt_frame_get_position( frame ) )
308                                         mlt_consumer_purge( this->play );
309                                 last_position = mlt_frame_get_position( frame );
310                         }
311                         else
312                         {
313                                 //mlt_consumer_purge( this->play );
314                                 last_position = -1;
315                         }
316
317                         // If we're not the first frame and both consumers are stopped, then stop ourselves
318                         if ( !first && mlt_consumer_is_stopped( this->play ) && mlt_consumer_is_stopped( this->still ) )
319                         {
320                                 this->running = 0;
321                                 mlt_frame_close( frame );
322                         }
323                         // Allow a little grace time before switching consumers on speed changes
324                         else if ( this->ignore_change -- > 0 && this->active != NULL && !mlt_consumer_is_stopped( this->active ) )
325                         {
326                                 mlt_consumer_put_frame( this->active, frame );
327                         }
328                         // If we aren't playing normally, then use the still
329                         else if ( speed != 1 )
330                         {
331                                 if ( !mlt_consumer_is_stopped( this->play ) )
332                                         mlt_consumer_stop( this->play );
333                                 if ( mlt_consumer_is_stopped( this->still ) )
334                                 {
335                                         this->last_speed = speed;
336                                         this->active = this->still;
337                                         this->ignore_change = 0;
338                                         mlt_consumer_start( this->still );
339                                 }
340                                 mlt_consumer_put_frame( this->still, frame );
341                         }
342                         // Otherwise use the normal player
343                         else
344                         {
345                                 if ( !mlt_consumer_is_stopped( this->still ) )
346                                         mlt_consumer_stop( this->still );
347                                 if ( mlt_consumer_is_stopped( this->play ) )
348                                 {
349                                         this->last_speed = speed;
350                                         this->active = this->play;
351                                         this->ignore_change = 25;
352                                         mlt_consumer_start( this->play );
353                                 }
354                                 mlt_consumer_put_frame( this->play, frame );
355                         }
356
357                         // Copy the rectangle info from the active consumer
358                         if ( this->running )
359                         {
360                                 mlt_properties active = MLT_CONSUMER_PROPERTIES( this->active );
361                                 mlt_service_lock( MLT_CONSUMER_SERVICE( consumer ) );
362                                 mlt_properties_set_int( properties, "rect_x", mlt_properties_get_int( active, "rect_x" ) );
363                                 mlt_properties_set_int( properties, "rect_y", mlt_properties_get_int( active, "rect_y" ) );
364                                 mlt_properties_set_int( properties, "rect_w", mlt_properties_get_int( active, "rect_w" ) );
365                                 mlt_properties_set_int( properties, "rect_h", mlt_properties_get_int( active, "rect_h" ) );
366                                 mlt_service_unlock( MLT_CONSUMER_SERVICE( consumer ) );
367                         }
368
369                         if ( this->active == this->still )
370                         {
371                                 pthread_mutex_lock( &this->refresh_mutex );
372                                 if ( this->running && speed == 0 && this->refresh_count <= 0 )
373                                         pthread_cond_wait( &this->refresh_cond, &this->refresh_mutex );
374                                 this->refresh_count --;
375                                 pthread_mutex_unlock( &this->refresh_mutex );
376                         }
377
378                         // We are definitely not waiting on the first frame any more
379                         first = 0;
380                 }
381                 else
382                 {
383                         if ( frame ) mlt_frame_close( frame );
384                         mlt_consumer_put_frame( this->active, NULL );
385                         this->running = 0;
386                 }
387         }
388
389         if ( this->play ) mlt_consumer_stop( this->play );
390         if ( this->still ) mlt_consumer_stop( this->still );
391
392         return NULL;
393 }
394
395 /** Callback to allow override of the close method.
396 */
397
398 static void consumer_close( mlt_consumer parent )
399 {
400         // Get the actual object
401         consumer_sdl this = parent->child;
402
403         // Stop the consumer
404         mlt_consumer_stop( parent );
405
406         // Close the child consumers
407         mlt_consumer_close( this->play );
408         mlt_consumer_close( this->still );
409
410         // Now clean up the rest
411         mlt_consumer_close( parent );
412
413         // Finally clean up this
414         free( this );
415 }