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 );
81 /** Get the producer associated to this playlist.
84 mlt_producer mlt_playlist_producer( mlt_playlist this )
89 /** Get the service associated to this playlist.
92 mlt_service mlt_playlist_service( mlt_playlist this )
94 return mlt_producer_service( &this->parent );
97 /** Get the propertues associated to this playlist.
100 mlt_properties mlt_playlist_properties( mlt_playlist this )
102 return mlt_producer_properties( &this->parent );
105 /** Append to the virtual playlist.
108 static int mlt_playlist_virtual_append( mlt_playlist this, mlt_producer producer, mlt_timecode in, mlt_timecode out )
110 // Get the fps of the first producer
111 double fps = mlt_properties_get_double( mlt_playlist_properties( this ), "first_fps" );
116 // Inherit it from the producer
117 fps = mlt_producer_get_fps( producer );
119 else if ( fps != mlt_properties_get_double( mlt_producer_properties( producer ), "fps" ) )
121 // Generate a warning for now - the following attempt to fix may fail
122 fprintf( stderr, "Warning: fps mismatch on playlist producer %d\n", this->count );
124 // It should be safe to impose fps on an image producer, but not necessarily safe for video
125 mlt_properties_set_double( mlt_producer_properties( producer ), "fps", fps );
128 // Check that we have room
129 if ( this->count >= this->size )
132 this->list = realloc( this->list, ( this->size + 10 ) * sizeof( playlist_entry * ) );
133 for ( i = this->size; i < this->size + 10; i ++ )
134 this->list[ i ] = NULL;
138 this->list[ this->count ] = calloc( sizeof( playlist_entry ), 1 );
139 this->list[ this->count ]->producer = producer;
140 this->list[ this->count ]->in = in;
141 this->list[ this->count ]->playtime = out - in;
145 mlt_properties_set_double( mlt_playlist_properties( this ), "first_fps", fps );
146 mlt_properties_set_double( mlt_playlist_properties( this ), "fps", fps );
151 /** Seek in the virtual playlist.
154 static mlt_producer mlt_playlist_virtual_seek( mlt_playlist this )
156 // Default producer to blank
157 mlt_producer producer = &this->blank;
159 // Map playlist position to real producer in virtual playlist
160 mlt_timecode position = mlt_producer_position( &this->parent );
162 // Loop through the virtual playlist
165 for ( i = 0; i < this->count; i ++ )
167 if ( position < this->list[ i ]->playtime )
169 // Found it, now break
170 producer = this->list[ i ]->producer;
171 position += this->list[ i ]->in;
176 // Decrement position by length of this entry
177 position -= this->list[ i ]->playtime;
181 // Seek in real producer to relative position
182 mlt_producer_seek( producer, position );
187 /** Append a producer to the playlist.
190 int mlt_playlist_append( mlt_playlist this, mlt_producer producer )
192 // Append to virtual list
193 return mlt_playlist_virtual_append( this, producer, 0, mlt_producer_get_playtime( producer ) );
196 /** Append a blank to the playlist of a given length.
199 int mlt_playlist_blank( mlt_playlist this, mlt_timecode length )
201 // Append to the virtual list
202 return mlt_playlist_virtual_append( this, &this->blank, 0, length );
205 /** Get the current frame.
208 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
210 // Get this mlt_playlist
211 mlt_playlist this = producer->child;
213 // Get the real producer
214 mlt_producer real = mlt_playlist_virtual_seek( this );
217 mlt_service_get_frame( mlt_producer_service( real ), frame, index );
219 // Update timecode on the frame we're creating
220 mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
222 // Position ourselves on the next frame
223 mlt_producer_prepare_next( producer );
228 /** Close the playlist.
231 void mlt_playlist_close( mlt_playlist this )
233 mlt_producer_close( &this->parent );
234 mlt_producer_close( &this->blank );