git.sesse.net Git - mlt/blob - src/framework/mlt_playlist.c

   1 /*
   2  * mlt_playlist.c -- playlist service class
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   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 "config.h"
  22
  23 #include "mlt_playlist.h"
  24 #include "mlt_frame.h"
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28
  29 /** Virtual playlist entry.
  30 */
  31
  32 typedef struct
  33 {
  34         mlt_producer producer;
  35         mlt_timecode in;
  36         mlt_timecode playtime;
  37 }
  38 playlist_entry;
  39
  40 /** Private definition.
  41 */
  42
  43 struct mlt_playlist_s
  44 {
  45         struct mlt_producer_s parent;
  46         struct mlt_producer_s blank;
  47
  48         int size;
  49         int count;
  50         playlist_entry **list;
  51 };
  52
  53 /** Forward declarations
  54 */
  55
  56 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  57
  58 /** Constructor.
  59 */
  60
  61 mlt_playlist mlt_playlist_init( )
  62 {
  63         mlt_playlist this = calloc( sizeof( struct mlt_playlist_s ), 1 );
  64         if ( this != NULL )
  65         {
  66                 mlt_producer producer = &this->parent;
  67
  68                 // Construct the producer
  69                 mlt_producer_init( producer, this );
  70
  71                 // Override the producer get_frame
  72                 producer->get_frame = producer_get_frame;
  73
  74                 // Initialise blank
  75                 mlt_producer_init( &this->blank, NULL );
  76
  77                 // Indicate that this producer is a playlist
  78                 mlt_properties_set_data( mlt_playlist_properties( this ), "playlist", this, 0, NULL, NULL );
  79         }
  80
  81         return this;
  82 }
  83
  84 /** Get the producer associated to this playlist.
  85 */
  86
  87 mlt_producer mlt_playlist_producer( mlt_playlist this )
  88 {
  89         return &this->parent;
  90 }
  91
  92 /** Get the service associated to this playlist.
  93 */
  94
  95 mlt_service mlt_playlist_service( mlt_playlist this )
  96 {
  97         return mlt_producer_service( &this->parent );
  98 }
  99
 100 /** Get the propertues associated to this playlist.
 101 */
 102
 103 mlt_properties mlt_playlist_properties( mlt_playlist this )
 104 {
 105         return mlt_producer_properties( &this->parent );
 106 }
 107
 108 static int mlt_playlist_virtual_refresh( mlt_playlist this )
 109 {
 110         int i = 0;
 111
 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;
 115
 116         for ( i = 0; i < this->count; i ++ )
 117         {
 118                 // Get the producer
 119                 mlt_producer producer = this->list[ i ]->producer;
 120
 121                 // If fps is 0
 122                 if ( fps == 0 )
 123                 {
 124                         // Inherit it from the producer
 125                         fps = mlt_producer_get_fps( producer );
 126                 }
 127                 else if ( fps != mlt_properties_get_double( mlt_producer_properties( producer ), "fps" ) )
 128                 {
 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 );
 131
 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 );
 134                 }
 135
 136                 // Update the playtime for this clip
 137                 playtime += this->list[ i ]->playtime;
 138         }
 139
 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 );
 145
 146         return 0;
 147 }
 148
 149 /** Append to the virtual playlist.
 150 */
 151
 152 static int mlt_playlist_virtual_append( mlt_playlist this, mlt_producer producer, mlt_timecode in, mlt_timecode out )
 153 {
 154         // Check that we have room
 155         if ( this->count >= this->size )
 156         {
 157                 int i;
 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;
 161                 this->size += 10;
 162         }
 163
 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;
 168
 169         this->count ++;
 170
 171         return mlt_playlist_virtual_refresh( this );
 172 }
 173
 174 /** Seek in the virtual playlist.
 175 */
 176
 177 static mlt_producer mlt_playlist_virtual_seek( mlt_playlist this )
 178 {
 179         // Default producer to blank
 180         mlt_producer producer = &this->blank;
 181
 182         // Map playlist position to real producer in virtual playlist
 183         mlt_timecode position = mlt_producer_position( &this->parent );
 184
 185         // Loop through the virtual playlist
 186         int i = 0;
 187
 188         for ( i = 0; i < this->count; i ++ )
 189         {
 190                 if ( position < this->list[ i ]->playtime )
 191                 {
 192                         // Found it, now break
 193                         producer = this->list[ i ]->producer;
 194                         position += this->list[ i ]->in;
 195                         break;
 196                 }
 197                 else
 198                 {
 199                         // Decrement position by length of this entry
 200                         position -= this->list[ i ]->playtime;
 201                 }
 202         }
 203
 204         // Seek in real producer to relative position
 205         mlt_producer_seek( producer, position );
 206
 207         return producer;
 208 }
 209
 210 static mlt_producer mlt_playlist_virtual_set_out( mlt_playlist this )
 211 {
 212         // Default producer to blank
 213         mlt_producer producer = &this->blank;
 214
 215         // Map playlist position to real producer in virtual playlist
 216         mlt_timecode position = mlt_producer_position( &this->parent );
 217
 218         // Loop through the virtual playlist
 219         int i = 0;
 220
 221         for ( i = 0; i < this->count; i ++ )
 222         {
 223                 if ( position < this->list[ i ]->playtime )
 224                 {
 225                         // Found it, now break
 226                         producer = this->list[ i ]->producer;
 227                         position += this->list[ i ]->in;
 228                         break;
 229                 }
 230                 else
 231                 {
 232                         // Decrement position by length of this entry
 233                         position -= this->list[ i ]->playtime;
 234                 }
 235         }
 236
 237         // Seek in real producer to relative position
 238         if ( i < this->count )
 239         {
 240                 // Update the playtime for the changed clip (hmmm)
 241                 this->list[ i ]->playtime = position - this->list[ i ]->in;
 242
 243                 // Refresh the playlist
 244                 mlt_playlist_virtual_refresh( this );
 245         }
 246
 247         return producer;
 248 }
 249
 250 int mlt_playlist_current_clip( mlt_playlist this )
 251 {
 252         // Map playlist position to real producer in virtual playlist
 253         mlt_timecode position = mlt_producer_position( &this->parent );
 254
 255         // Loop through the virtual playlist
 256         int i = 0;
 257
 258         for ( i = 0; i < this->count; i ++ )
 259         {
 260                 if ( position < this->list[ i ]->playtime )
 261                 {
 262                         // Found it, now break
 263                         break;
 264                 }
 265                 else
 266                 {
 267                         // Decrement position by length of this entry
 268                         position -= this->list[ i ]->playtime;
 269                 }
 270         }
 271
 272         return i;
 273 }
 274
 275 mlt_producer mlt_playlist_current( mlt_playlist this )
 276 {
 277         int i = mlt_playlist_current_clip( this );
 278         if ( i < this->count )
 279                 return this->list[ i ]->producer;
 280         else
 281                 return &this->blank;
 282 }
 283
 284 /** Get the timecode which corresponds to the start of the next clip.
 285 */
 286
 287 mlt_timecode mlt_playlist_clip( mlt_playlist this, mlt_whence whence, int index )
 288 {
 289         mlt_timecode position = 0;
 290         int absolute_clip = index;
 291         int i = 0;
 292
 293         // Determine the absolute clip
 294         switch ( whence )
 295         {
 296                 case mlt_whence_relative_start:
 297                         absolute_clip = index;
 298                         break;
 299
 300                 case mlt_whence_relative_current:
 301                         absolute_clip = mlt_playlist_current_clip( this ) + index;
 302                         break;
 303
 304                 case mlt_whence_relative_end:
 305                         absolute_clip = this->count - index;
 306                         break;
 307         }
 308
 309         // Check that we're in a valid range
 310         if ( absolute_clip < 0 )
 311                 absolute_clip = 0;
 312         else if ( absolute_clip > this->count )
 313                 absolute_clip = this->count;
 314
 315         // Now determine the timecode
 316         for ( i = 0; i < absolute_clip; i ++ )
 317                 position += this->list[ i ]->playtime;
 318
 319         return position;
 320 }
 321
 322 int mlt_playlist_get_clip_info( mlt_playlist this, mlt_playlist_clip_info *info, int index )
 323 {
 324         int error = index < 0 || index >= this->count;
 325         if ( !error )
 326         {
 327                 mlt_producer producer = this->list[ index ]->producer;
 328                 mlt_properties properties = mlt_producer_properties( producer );
 329                 info->resource = mlt_properties_get( properties, "resource" );
 330                 info->in = this->list[ index ]->in;
 331                 info->out = this->list[ index ]->in + this->list[ index ]->playtime;
 332                 info->playtime = this->list[ index ]->playtime;
 333                 info->length = mlt_producer_get_length( producer );
 334                 info->fps = mlt_producer_get_fps( producer );
 335         }
 336         return error;
 337 }
 338
 339 /** Get number of clips in the playlist.
 340 */
 341
 342 int mlt_playlist_count( mlt_playlist this )
 343 {
 344         return this->count;
 345 }
 346
 347 /** Clear the playlist.
 348 */
 349
 350 int mlt_playlist_clear( mlt_playlist this )
 351 {
 352         this->count = 0;
 353         return mlt_playlist_virtual_refresh( this );
 354 }
 355
 356 /** Append a producer to the playlist.
 357 */
 358
 359 int mlt_playlist_append( mlt_playlist this, mlt_producer producer )
 360 {
 361         // Append to virtual list
 362         return mlt_playlist_virtual_append( this, producer, 0, mlt_producer_get_playtime( producer ) );
 363 }
 364
 365 /** Append a producer to the playlist with in/out points.
 366 */
 367
 368 int mlt_playlist_append_io( mlt_playlist this, mlt_producer producer, double in, double out )
 369 {
 370         // Append to virtual list
 371         if ( in != -1 && out != -1 )
 372                 return mlt_playlist_virtual_append( this, producer, in, out - in );
 373         else
 374                 return mlt_playlist_virtual_append( this, producer, 0, mlt_producer_get_playtime( producer ) );
 375 }
 376
 377 /** Append a blank to the playlist of a given length.
 378 */
 379
 380 int mlt_playlist_blank( mlt_playlist this, mlt_timecode length )
 381 {
 382         // Append to the virtual list
 383         return mlt_playlist_virtual_append( this, &this->blank, 0, length );
 384 }
 385
 386 /** Get the current frame.
 387 */
 388
 389 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 390 {
 391         // Get this mlt_playlist
 392         mlt_playlist this = producer->child;
 393
 394         // Get the real producer
 395         mlt_producer real = mlt_playlist_virtual_seek( this );
 396
 397         // Get the frame
 398         mlt_service_get_frame( mlt_producer_service( real ), frame, index );
 399
 400         // Check if we're at the end of the clip
 401         mlt_properties properties = mlt_frame_properties( *frame );
 402         if ( mlt_properties_get_int( properties, "end_of_clip" ) )
 403                 mlt_playlist_virtual_set_out( this );
 404
 405         // Check for notifier and call with appropriate argument
 406         mlt_properties playlist_properties = mlt_producer_properties( producer );
 407         void ( *notifier )( void * ) = mlt_properties_get_data( playlist_properties, "notifier", NULL );
 408         if ( notifier != NULL )
 409         {
 410                 void *argument = mlt_properties_get_data( playlist_properties, "notifier_arg", NULL );
 411                 notifier( argument );
 412         }
 413
 414         // Update timecode on the frame we're creating
 415         mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
 416
 417         // Position ourselves on the next frame
 418         mlt_producer_prepare_next( producer );
 419
 420         return 0;
 421 }
 422
 423 /** Close the playlist.
 424 */
 425
 426 void mlt_playlist_close( mlt_playlist this )
 427 {
 428         mlt_producer_close( &this->parent );
 429         mlt_producer_close( &this->blank );
 430         free( this );
 431 }