git.sesse.net Git - vlc/blob - src/control/media_instance.c

   1 /*****************************************************************************
   2  * media_instance.c: Libvlc API Media Instance management functions
   3  *****************************************************************************
   4  * Copyright (C) 2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Clément Stenac <zorglub@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #include "libvlc_internal.h"
  25 #include <vlc/libvlc.h>
  26 #include <vlc_demux.h>
  27 #include <vlc_input.h>
  28 #include "input/input_internal.h"
  29
  30 /*
  31  * Release the associated input thread
  32  */
  33 static void release_input_thread( libvlc_media_instance_t *p_mi )
  34 {
  35     input_thread_t *p_input_thread;
  36     vlc_bool_t should_destroy;
  37     libvlc_exception_t p_e;
  38
  39     /* XXX: locking */
  40     libvlc_exception_init( &p_e );
  41
  42     p_input_thread = libvlc_get_input_thread( p_mi, &p_e );
  43
  44     p_mi->i_input_id = -1;
  45
  46     if( libvlc_exception_raised( &p_e ) )
  47         return;
  48
  49     /* release for previous libvlc_get_input_thread */
  50     vlc_object_release( p_input_thread );
  51
  52     should_destroy = p_input_thread->i_refcount == 1;
  53
  54     /* release for initial p_input_thread yield (see _new()) */
  55     vlc_object_release( p_input_thread );
  56
  57     /* No one is tracking this input_thread appart us. Destroy it */
  58     if( should_destroy )
  59         input_DestroyThread( p_input_thread );
  60 }
  61
  62 /*
  63  * Retrieve the input thread. Be sure to release the object
  64  * once you are done with it. (libvlc Internal)
  65  */
  66 input_thread_t *libvlc_get_input_thread( libvlc_media_instance_t *p_mi,
  67                                          libvlc_exception_t *p_e )
  68 {
  69     input_thread_t *p_input_thread;
  70
  71     if( !p_mi || p_mi->i_input_id == -1 )
  72         RAISENULL( "Input is NULL" );
  73
  74     p_input_thread = (input_thread_t*)vlc_object_get(
  75                                              p_mi->p_libvlc_instance->p_libvlc_int,
  76                                              p_mi->i_input_id );
  77     if( !p_input_thread )
  78         RAISENULL( "Input does not exist" );
  79
  80     return p_input_thread;
  81 }
  82
  83
  84 /**************************************************************************
  85  * Create a Media Instance object
  86  **************************************************************************/
  87 libvlc_media_instance_t *
  88 libvlc_media_instance_new( libvlc_instance_t * p_libvlc_instance,
  89                            libvlc_exception_t *p_e )
  90 {
  91     libvlc_media_instance_t * p_mi;
  92
  93     if( !p_libvlc_instance )
  94     {
  95         libvlc_exception_raise( p_e, "invalid libvlc instance" );
  96         return NULL;
  97     }
  98
  99     p_mi = malloc( sizeof(libvlc_media_instance_t) );
 100     p_mi->p_md = NULL;
 101     p_mi->p_libvlc_instance = p_libvlc_instance;
 102     p_mi->i_input_id = -1;
 103
 104     return p_mi;
 105 }
 106
 107 /**************************************************************************
 108  * Create a Media Instance object with a media descriptor
 109  **************************************************************************/
 110 libvlc_media_instance_t *
 111 libvlc_media_instance_new_from_media_descriptor(
 112                                     libvlc_media_descriptor_t * p_md,
 113                                     libvlc_exception_t *p_e )
 114 {
 115     libvlc_media_instance_t * p_mi;
 116
 117     if( !p_md )
 118     {
 119         libvlc_exception_raise( p_e, "invalid media descriptor" );
 120         return NULL;
 121     }
 122
 123     p_mi = malloc( sizeof(libvlc_media_instance_t) );
 124     p_mi->p_md = libvlc_media_descriptor_duplicate( p_md );
 125     p_mi->p_libvlc_instance = p_mi->p_md->p_libvlc_instance;
 126     p_mi->i_input_id = -1;
 127
 128     return p_mi;
 129 }
 130
 131 /**************************************************************************
 132  * Create a new media instance object from an input_thread (Libvlc Internal)
 133  **************************************************************************/
 134 libvlc_media_instance_t * libvlc_media_instance_new_from_input_thread(
 135                                    struct libvlc_instance_t *p_libvlc_instance,
 136                                    input_thread_t *p_input,
 137                                    libvlc_exception_t *p_e )
 138 {
 139     libvlc_media_instance_t * p_mi;
 140
 141     if( !p_input )
 142     {
 143         libvlc_exception_raise( p_e, "invalid input thread" );
 144         return NULL;
 145     }
 146
 147     p_mi = malloc( sizeof(libvlc_media_instance_t) );
 148     p_mi->p_md = libvlc_media_descriptor_new_from_input_item(
 149                     p_libvlc_instance,
 150                     p_input->p->input.p_item, p_e );
 151
 152     if( !p_mi->p_md )
 153     {
 154         free( p_mi );
 155         return NULL;
 156     }
 157
 158     p_mi->p_libvlc_instance = p_libvlc_instance;
 159     p_mi->i_input_id = p_input->i_object_id;
 160
 161     /* will be released in media_instance_release() */
 162     vlc_object_yield( p_input );
 163
 164     return p_mi;
 165 }
 166
 167 /**************************************************************************
 168  * Destroy a Media Instance object (libvlc internal)
 169  **************************************************************************/
 170 void libvlc_media_instance_destroy( libvlc_media_instance_t *p_mi )
 171 {
 172     input_thread_t *p_input_thread;
 173     libvlc_exception_t p_e;
 174
 175     /* XXX: locking */
 176     libvlc_exception_init( &p_e );
 177
 178     if( !p_mi )
 179         return;
 180
 181     p_input_thread = libvlc_get_input_thread( p_mi, &p_e );
 182
 183     if( libvlc_exception_raised( &p_e ) )
 184         return; /* no need to worry about no input thread */
 185
 186     input_DestroyThread( p_input_thread );
 187
 188     libvlc_media_descriptor_destroy( p_mi->p_md );
 189
 190     free( p_mi );
 191 }
 192
 193 /**************************************************************************
 194  * Release a Media Instance object
 195  **************************************************************************/
 196 void libvlc_media_instance_release( libvlc_media_instance_t *p_mi )
 197 {
 198     /* XXX: locking */
 199
 200     if( !p_mi )
 201         return;
 202
 203     release_input_thread( p_mi );
 204
 205     libvlc_media_descriptor_destroy( p_mi->p_md );
 206
 207     free( p_mi );
 208 }
 209
 210 /**************************************************************************
 211  * Set the Media descriptor associated with the instance
 212  **************************************************************************/
 213 void libvlc_media_instance_set_media_descriptor(
 214                             libvlc_media_instance_t *p_mi,
 215                             libvlc_media_descriptor_t *p_md,
 216                             libvlc_exception_t *p_e )
 217 {
 218     (void)p_e;
 219
 220     /* XXX : lock */
 221
 222     if( !p_mi )
 223         return;
 224
 225     release_input_thread( p_mi );
 226
 227     libvlc_media_descriptor_destroy( p_mi->p_md );
 228
 229     if( !p_md )
 230     {
 231         p_mi->p_md = NULL;
 232         return; /* It is ok to pass a NULL md */
 233     }
 234
 235     p_mi->p_md = libvlc_media_descriptor_duplicate( p_md );
 236
 237     /* The policy here is to ignore that we were created using a different
 238      * libvlc_instance, because we don't really care */
 239     p_mi->p_libvlc_instance = p_md->p_libvlc_instance;
 240
 241 }
 242
 243 /**************************************************************************
 244  * Set the Media descriptor associated with the instance
 245  **************************************************************************/
 246 libvlc_media_descriptor_t *
 247 libvlc_media_instance_get_media_descriptor(
 248                             libvlc_media_instance_t *p_mi,
 249                             libvlc_exception_t *p_e )
 250 {
 251     (void)p_e;
 252
 253     if( !p_mi->p_md )
 254         return NULL;
 255
 256     return libvlc_media_descriptor_duplicate( p_mi->p_md );
 257 }
 258
 259 /**************************************************************************
 260  * Play
 261  **************************************************************************/
 262 void libvlc_media_instance_play( libvlc_media_instance_t *p_mi,
 263                                  libvlc_exception_t *p_e )
 264 {
 265     input_thread_t * p_input_thread;
 266
 267     if( p_mi->i_input_id != -1)
 268     {
 269         vlc_value_t val;
 270         val.i_int = PLAYING_S;
 271
 272         /* A thread alread exists, send it a play message */
 273         p_input_thread = libvlc_get_input_thread( p_mi, p_e );
 274
 275         if( !p_input_thread )
 276             return;
 277
 278         input_Control( p_input_thread, INPUT_CONTROL_SET_STATE, PLAYING_S );
 279         vlc_object_release( p_input_thread );
 280         return;
 281     }
 282
 283     if( !p_mi->p_md )
 284     {
 285         libvlc_exception_raise( p_e, "no associated media descriptor" );
 286         return;
 287     }
 288
 289     p_input_thread = input_CreateThread( p_mi->p_libvlc_instance->p_libvlc_int,
 290                                          p_mi->p_md->p_input_item );
 291     p_mi->i_input_id = p_input_thread->i_object_id;
 292
 293     /* will be released in media_instance_release() */
 294     vlc_object_yield( p_input_thread );
 295 }
 296
 297 /**************************************************************************
 298  * Pause
 299  **************************************************************************/
 300 void libvlc_media_instance_pause( libvlc_media_instance_t *p_mi,
 301                                   libvlc_exception_t *p_e )
 302 {
 303     input_thread_t * p_input_thread;
 304     vlc_value_t val;
 305     val.i_int = PAUSE_S;
 306
 307     p_input_thread = libvlc_get_input_thread( p_mi, p_e );
 308
 309     if( !p_input_thread )
 310         return;
 311
 312     input_Control( p_input_thread, INPUT_CONTROL_SET_STATE, val );
 313     vlc_object_release( p_input_thread );
 314 }
 315
 316 /**************************************************************************
 317  * Getters for stream information
 318  **************************************************************************/
 319 vlc_int64_t libvlc_media_instance_get_length(
 320                              libvlc_media_instance_t *p_mi,
 321                              libvlc_exception_t *p_e )
 322 {
 323     input_thread_t *p_input_thread;
 324     vlc_value_t val;
 325
 326     p_input_thread = libvlc_get_input_thread ( p_mi, p_e);
 327     if( !p_input_thread )
 328         return -1;
 329
 330     var_Get( p_input_thread, "length", &val );
 331     vlc_object_release( p_input_thread );
 332
 333     return (val.i_time+500LL)/1000LL;
 334 }
 335
 336 vlc_int64_t libvlc_media_instance_get_time(
 337                                    libvlc_media_instance_t *p_mi,
 338                                    libvlc_exception_t *p_e )
 339 {
 340     input_thread_t *p_input_thread;
 341     vlc_value_t val;
 342
 343     p_input_thread = libvlc_get_input_thread ( p_mi, p_e );
 344     if( !p_input_thread )
 345         return -1;
 346
 347     var_Get( p_input_thread , "time", &val );
 348     vlc_object_release( p_input_thread );
 349     return (val.i_time+500LL)/1000LL;
 350 }
 351
 352 void libvlc_media_instance_set_time(
 353                                  libvlc_media_instance_t *p_mi,
 354                                  vlc_int64_t time,
 355                                  libvlc_exception_t *p_e )
 356 {
 357     input_thread_t *p_input_thread;
 358     vlc_value_t value;
 359
 360     p_input_thread = libvlc_get_input_thread ( p_mi, p_e );
 361     if( !p_input_thread )
 362         return;
 363
 364     value.i_time = time*1000LL;
 365     var_Set( p_input_thread, "time", value );
 366     vlc_object_release( p_input_thread );
 367 }
 368
 369 void libvlc_media_instance_set_position(
 370                                 libvlc_media_instance_t *p_mi,
 371                                 float position,
 372                                 libvlc_exception_t *p_e )
 373 {
 374     input_thread_t *p_input_thread;
 375     vlc_value_t val;
 376     val.f_float = position;
 377
 378     p_input_thread = libvlc_get_input_thread ( p_mi, p_e);
 379     if( !p_input_thread )
 380         return;
 381
 382     var_Set( p_input_thread, "position", val );
 383     vlc_object_release( p_input_thread );
 384 }
 385
 386 float libvlc_media_instance_get_position(
 387                                  libvlc_media_instance_t *p_mi,
 388                                  libvlc_exception_t *p_e )
 389 {
 390     input_thread_t *p_input_thread;
 391     vlc_value_t val;
 392
 393     p_input_thread = libvlc_get_input_thread ( p_mi, p_e );
 394     if( !p_input_thread )
 395         return -1.0;
 396
 397     var_Get( p_input_thread, "position", &val );
 398     vlc_object_release( p_input_thread );
 399
 400     return val.f_float;
 401 }
 402
 403 float libvlc_media_instance_get_fps(
 404                                  libvlc_media_instance_t *p_mi,
 405                                  libvlc_exception_t *p_e)
 406 {
 407     double f_fps = 0.0;
 408     input_thread_t *p_input_thread;
 409
 410     p_input_thread = libvlc_get_input_thread ( p_mi, p_e );
 411     if( !p_input_thread )
 412         return 0.0;
 413
 414     if( (NULL == p_input_thread->p->input.p_demux)
 415         || demux2_Control( p_input_thread->p->input.p_demux, DEMUX_GET_FPS, &f_fps )
 416         || f_fps < 0.1 )
 417     {
 418         vlc_object_release( p_input_thread );
 419         return 0.0;
 420     }
 421     else
 422     {
 423         vlc_object_release( p_input_thread );
 424         return( f_fps );
 425     }
 426 }
 427
 428 vlc_bool_t libvlc_media_instance_will_play(
 429                                  libvlc_media_instance_t *p_mi,
 430                                  libvlc_exception_t *p_e)
 431 {
 432     input_thread_t *p_input_thread =
 433                             libvlc_get_input_thread ( p_mi, p_e);
 434     if ( !p_input_thread )
 435         return VLC_FALSE;
 436
 437     if ( !p_input_thread->b_die && !p_input_thread->b_dead )
 438     {
 439         vlc_object_release( p_input_thread );
 440         return VLC_TRUE;
 441     }
 442     vlc_object_release( p_input_thread );
 443     return VLC_FALSE;
 444 }
 445
 446 void libvlc_media_instance_set_rate(
 447                                  libvlc_media_instance_t *p_mi,
 448                                  float rate,
 449                                  libvlc_exception_t *p_e )
 450 {
 451     input_thread_t *p_input_thread;
 452     vlc_value_t val;
 453
 454     if( rate <= 0 )
 455         RAISEVOID( "Rate value is invalid" );
 456
 457     val.i_int = 1000.0f/rate;
 458
 459     p_input_thread = libvlc_get_input_thread ( p_mi, p_e);
 460     if ( !p_input_thread )
 461         return;
 462
 463     var_Set( p_input_thread, "rate", val );
 464     vlc_object_release( p_input_thread );
 465 }
 466
 467 float libvlc_media_instance_get_rate(
 468                                  libvlc_media_instance_t *p_mi,
 469                                  libvlc_exception_t *p_e )
 470 {
 471     input_thread_t *p_input_thread;
 472     vlc_value_t val;
 473
 474     p_input_thread = libvlc_get_input_thread ( p_mi, p_e);
 475     if ( !p_input_thread )
 476         return -1.0;
 477
 478     var_Get( p_input_thread, "rate", &val );
 479     vlc_object_release( p_input_thread );
 480
 481     return (float)1000.0f/val.i_int;
 482 }
 483
 484 int libvlc_media_instance_get_state(
 485                                  libvlc_media_instance_t *p_mi,
 486                                  libvlc_exception_t *p_e )
 487 {
 488     input_thread_t *p_input_thread;
 489     vlc_value_t val;
 490
 491     p_input_thread = libvlc_get_input_thread ( p_mi, p_e );
 492     if ( !p_input_thread )
 493         return 0;
 494
 495     var_Get( p_input_thread, "state", &val );
 496     vlc_object_release( p_input_thread );
 497
 498     return val.i_int;
 499 }
 500