2 * mlt_playlist.c -- playlist service class
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
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.
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.
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.
23 #include "mlt_playlist.h"
24 #include "mlt_frame.h"
29 /** Virtual playlist entry.
34 mlt_producer producer
;
36 mlt_timecode playtime
;
40 /** Private definition.
45 struct mlt_producer_s parent
;
46 struct mlt_producer_s blank
;
50 playlist_entry
**list
;
53 /** Forward declarations
56 static int producer_get_frame( mlt_producer producer
, mlt_frame_ptr frame
, int index
);
61 mlt_playlist
mlt_playlist_init( )
63 mlt_playlist
this = calloc( sizeof( struct mlt_playlist_s
), 1 );
66 mlt_producer producer
= &this->parent
;
68 // Construct the producer
69 mlt_producer_init( producer
, this );
71 // Override the producer get_frame
72 producer
->get_frame
= producer_get_frame
;
75 mlt_producer_init( &this->blank
, NULL
);
77 // Indicate that this producer is a playlist
78 mlt_properties_set_data( mlt_playlist_properties( this ), "playlist", this, 0, NULL
, NULL
);
84 /** Get the producer associated to this playlist.
87 mlt_producer
mlt_playlist_producer( mlt_playlist
this )
92 /** Get the service associated to this playlist.
95 mlt_service
mlt_playlist_service( mlt_playlist
this )
97 return mlt_producer_service( &this->parent
);
100 /** Get the propertues associated to this playlist.
103 mlt_properties
mlt_playlist_properties( mlt_playlist
this )
105 return mlt_producer_properties( &this->parent
);
108 static int mlt_playlist_virtual_refresh( mlt_playlist
this )
112 // Get the fps of the first producer
113 double fps
= mlt_properties_get_double( mlt_playlist_properties( this ), "first_fps" );
114 mlt_timecode playtime
= 0;
116 for ( i
= 0; i
< this->count
; i
++ )
119 mlt_producer producer
= this->list
[ i
]->producer
;
124 // Inherit it from the producer
125 fps
= mlt_producer_get_fps( producer
);
127 else if ( fps
!= mlt_properties_get_double( mlt_producer_properties( producer
), "fps" ) )
129 // Generate a warning for now - the following attempt to fix may fail
130 fprintf( stderr
, "Warning: fps mismatch on playlist producer %d\n", this->count
);
132 // It should be safe to impose fps on an image producer, but not necessarily safe for video
133 mlt_properties_set_double( mlt_producer_properties( producer
), "fps", fps
);
136 // Update the playtime for this clip
137 playtime
+= this->list
[ i
]->playtime
;
140 // Refresh all properties
141 mlt_properties_set_double( mlt_playlist_properties( this ), "first_fps", fps
);
142 mlt_properties_set_double( mlt_playlist_properties( this ), "fps", fps
);
143 mlt_properties_set_timecode( mlt_playlist_properties( this ), "length", playtime
);
144 mlt_properties_set_timecode( mlt_playlist_properties( this ), "out", playtime
);
149 /** Append to the virtual playlist.
152 static int mlt_playlist_virtual_append( mlt_playlist
this, mlt_producer producer
, mlt_timecode in
, mlt_timecode out
)
154 // Check that we have room
155 if ( this->count
>= this->size
)
158 this->list
= realloc( this->list
, ( this->size
+ 10 ) * sizeof( playlist_entry
* ) );
159 for ( i
= this->size
; i
< this->size
+ 10; i
++ )
160 this->list
[ i
] = NULL
;
164 this->list
[ this->count
] = calloc( sizeof( playlist_entry
), 1 );
165 this->list
[ this->count
]->producer
= producer
;
166 this->list
[ this->count
]->in
= in
;
167 this->list
[ this->count
]->playtime
= out
- in
;
171 return mlt_playlist_virtual_refresh( this );
174 /** Seek in the virtual playlist.
177 static mlt_producer
mlt_playlist_virtual_seek( mlt_playlist
this )
179 // Default producer to blank
180 mlt_producer producer
= &this->blank
;
182 // Map playlist position to real producer in virtual playlist
183 mlt_timecode position
= mlt_producer_position( &this->parent
);
185 // Loop through the virtual playlist
188 for ( i
= 0; i
< this->count
; i
++ )
190 if ( position
< this->list
[ i
]->playtime
)
192 // Found it, now break
193 producer
= this->list
[ i
]->producer
;
194 position
+= this->list
[ i
]->in
;
199 // Decrement position by length of this entry
200 position
-= this->list
[ i
]->playtime
;
204 // Seek in real producer to relative position
205 mlt_producer_seek( producer
, position
);
210 static mlt_producer
mlt_playlist_virtual_set_out( mlt_playlist
this )
212 // Default producer to blank
213 mlt_producer producer
= &this->blank
;
215 // Map playlist position to real producer in virtual playlist
216 mlt_timecode position
= mlt_producer_position( &this->parent
);
218 // Loop through the virtual playlist
221 for ( i
= 0; i
< this->count
; i
++ )
223 if ( position
< this->list
[ i
]->playtime
)
225 // Found it, now break
226 producer
= this->list
[ i
]->producer
;
227 position
+= this->list
[ i
]->in
;
232 // Decrement position by length of this entry
233 position
-= this->list
[ i
]->playtime
;
237 // Seek in real producer to relative position
238 if ( i
< this->count
)
240 // Update the playtime for the changed clip (hmmm)
241 this->list
[ i
]->playtime
= position
- this->list
[ i
]->in
;
243 // Refresh the playlist
244 mlt_playlist_virtual_refresh( this );
250 int mlt_playlist_current_clip( mlt_playlist
this )
252 // Map playlist position to real producer in virtual playlist
253 mlt_timecode position
= mlt_producer_position( &this->parent
);
255 // Loop through the virtual playlist
258 for ( i
= 0; i
< this->count
; i
++ )
260 if ( position
< this->list
[ i
]->playtime
)
262 // Found it, now break
267 // Decrement position by length of this entry
268 position
-= this->list
[ i
]->playtime
;
275 mlt_producer
mlt_playlist_current( mlt_playlist
this )
277 int i
= mlt_playlist_current_clip( this );
278 if ( i
< this->count
)
279 return this->list
[ i
]->producer
;
284 /** Get the timecode which corresponds to the start of the next clip.
287 mlt_timecode
mlt_playlist_clip( mlt_playlist
this, mlt_whence whence
, int index
)
289 mlt_timecode position
= 0;
290 int absolute_clip
= index
;
293 // Determine the absolute clip
296 case mlt_whence_relative_start
:
297 absolute_clip
= index
;
300 case mlt_whence_relative_current
:
301 absolute_clip
= mlt_playlist_current_clip( this ) + index
;
304 case mlt_whence_relative_end
:
305 absolute_clip
= this->count
- index
;
309 // Check that we're in a valid range
310 if ( absolute_clip
< 0 )
312 else if ( absolute_clip
> this->count
)
313 absolute_clip
= this->count
;
315 // Now determine the timecode
316 for ( i
= 0; i
< absolute_clip
; i
++ )
317 position
+= this->list
[ i
]->playtime
;
322 int mlt_playlist_get_clip_info( mlt_playlist
this, mlt_playlist_clip_info
*info
, int index
)
324 int error
= index
< 0 || index
>= this->count
;
325 memset( info
, 0, sizeof( mlt_playlist_clip_info
) );
328 mlt_producer producer
= this->list
[ index
]->producer
;
329 mlt_properties properties
= mlt_producer_properties( producer
);
330 info
->resource
= mlt_properties_get( properties
, "resource" );
331 info
->in
= this->list
[ index
]->in
;
332 info
->out
= this->list
[ index
]->in
+ this->list
[ index
]->playtime
;
333 info
->playtime
= this->list
[ index
]->playtime
;
334 info
->length
= mlt_producer_get_length( producer
);
335 info
->fps
= mlt_producer_get_fps( producer
);
340 /** Get number of clips in the playlist.
343 int mlt_playlist_count( mlt_playlist
this )
348 /** Clear the playlist.
351 int mlt_playlist_clear( mlt_playlist
this )
354 mlt_properties_set_double( mlt_playlist_properties( this ), "first_fps", 0 );
355 return mlt_playlist_virtual_refresh( this );
358 /** Append a producer to the playlist.
361 int mlt_playlist_append( mlt_playlist
this, mlt_producer producer
)
363 // Append to virtual list
364 return mlt_playlist_virtual_append( this, producer
, 0, mlt_producer_get_playtime( producer
) );
367 /** Append a producer to the playlist with in/out points.
370 int mlt_playlist_append_io( mlt_playlist
this, mlt_producer producer
, double in
, double out
)
372 // Append to virtual list
373 if ( in
!= -1 && out
!= -1 )
374 return mlt_playlist_virtual_append( this, producer
, in
, out
- in
);
376 return mlt_playlist_virtual_append( this, producer
, 0, mlt_producer_get_playtime( producer
) );
379 /** Append a blank to the playlist of a given length.
382 int mlt_playlist_blank( mlt_playlist
this, mlt_timecode length
)
384 // Append to the virtual list
385 return mlt_playlist_virtual_append( this, &this->blank
, 0, length
);
388 /** Insert a producer into the playlist.
391 int mlt_playlist_insert( mlt_playlist
this, mlt_producer producer
, int where
, mlt_timecode in
, mlt_timecode out
)
396 int mlt_playlist_remove( mlt_playlist
this, int where
)
401 int mlt_playlist_move( mlt_playlist
this, int from
, int to
)
406 /** Get the current frame.
409 static int producer_get_frame( mlt_producer producer
, mlt_frame_ptr frame
, int index
)
411 // Get this mlt_playlist
412 mlt_playlist
this = producer
->child
;
414 // Get the real producer
415 mlt_producer real
= mlt_playlist_virtual_seek( this );
418 mlt_service_get_frame( mlt_producer_service( real
), frame
, index
);
420 // Check if we're at the end of the clip
421 mlt_properties properties
= mlt_frame_properties( *frame
);
422 if ( mlt_properties_get_int( properties
, "end_of_clip" ) )
423 mlt_playlist_virtual_set_out( this );
425 // Check for notifier and call with appropriate argument
426 mlt_properties playlist_properties
= mlt_producer_properties( producer
);
427 void ( *notifier
)( void * ) = mlt_properties_get_data( playlist_properties
, "notifier", NULL
);
428 if ( notifier
!= NULL
)
430 void *argument
= mlt_properties_get_data( playlist_properties
, "notifier_arg", NULL
);
431 notifier( argument
);
434 // Update timecode on the frame we're creating
435 mlt_frame_set_timecode( *frame
, mlt_producer_position( producer
) );
437 // Position ourselves on the next frame
438 mlt_producer_prepare_next( producer
);
443 /** Close the playlist.
446 void mlt_playlist_close( mlt_playlist
this )
448 mlt_producer_close( &this->parent
);
449 mlt_producer_close( &this->blank
);