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     p_mi = malloc( sizeof(libvlc_media_instance_t) );
 142     p_mi->p_md = libvlc_media_descriptor_new_from_input_item(
 143                     p_libvlc_instance,
 144                     p_input->p->input.p_item, p_e );
 145
 146     if( libvlc_exception_raised( p_e ) )
 147     {
 148         free( p_mi );
 149         return NULL;
 150     }
 151
 152     p_mi->p_libvlc_instance = p_libvlc_instance;
 153     p_mi->i_input_id = p_input->i_object_id;
 154
 155     /* will be released in media_instance_release() */
 156     vlc_object_yield( p_input );
 157
 158     return p_mi;
 159 }
 160
 161 /**************************************************************************
 162  * Destroy a Media Instance object (libvlc internal)
 163  **************************************************************************/
 164 void libvlc_media_instance_destroy( libvlc_media_instance_t *p_mi )
 165 {
 166     input_thread_t *p_input_thread;
 167     libvlc_exception_t p_e;
 168
 169     /* XXX: locking */
 170     libvlc_exception_init( &p_e );
 171
 172     if( !p_mi )
 173         return;
 174
 175     p_input_thread = libvlc_get_input_thread( p_mi, &p_e );
 176
 177     if( libvlc_exception_raised( &p_e ) )
 178         return; /* no need to worry about no input thread */
 179
 180     input_DestroyThread( p_input_thread );
 181
 182     libvlc_media_descriptor_destroy( p_mi->p_md );
 183
 184     free( p_mi );
 185 }
 186
 187 /**************************************************************************
 188  * Release a Media Instance object
 189  **************************************************************************/
 190 void libvlc_media_instance_release( libvlc_media_instance_t *p_mi )
 191 {
 192     /* XXX: locking */
 193
 194     if( !p_mi )
 195         return;
 196
 197     release_input_thread( p_mi );
 198
 199     libvlc_media_descriptor_destroy( p_mi->p_md );
 200
 201     free( p_mi );
 202 }
 203
 204 /**************************************************************************
 205  * Set the Media descriptor associated with the instance
 206  **************************************************************************/
 207 void libvlc_media_instance_set_media_descriptor(
 208                             libvlc_media_instance_t *p_mi,
 209                             libvlc_media_descriptor_t *p_md,
 210                             libvlc_exception_t *p_e )
 211 {
 212     (void)p_e;
 213
 214     /* XXX : lock */
 215
 216     if( !p_mi )
 217         return;
 218
 219     release_input_thread( p_mi );
 220
 221     libvlc_media_descriptor_destroy( p_mi->p_md );
 222
 223     if( !p_md )
 224     {
 225         p_mi->p_md = NULL;
 226         return; /* It is ok to pass a NULL md */
 227     }
 228
 229     p_mi->p_md = libvlc_media_descriptor_duplicate( p_md );
 230
 231     /* The policy here is to ignore that we were created using a different
 232      * libvlc_instance, because we don't really care */
 233     p_mi->p_libvlc_instance = p_md->p_libvlc_instance;
 234
 235 }
 236
 237 /**************************************************************************
 238  * Set the Media descriptor associated with the instance
 239  **************************************************************************/
 240 libvlc_media_descriptor_t *
 241 libvlc_media_instance_get_media_descriptor(
 242                             libvlc_media_instance_t *p_mi,
 243                             libvlc_exception_t *p_e )
 244 {
 245     (void)p_e;
 246
 247     if( !p_mi->p_md )
 248         return NULL;
 249
 250     return libvlc_media_descriptor_duplicate( p_mi->p_md );
 251 }
 252
 253 /**************************************************************************
 254  * Play
 255  **************************************************************************/
 256 void libvlc_media_instance_play( libvlc_media_instance_t *p_mi,
 257                                  libvlc_exception_t *p_e )
 258 {
 259     input_thread_t * p_input_thread;
 260
 261     if( p_mi->i_input_id != -1)
 262     {
 263         vlc_value_t val;
 264         val.i_int = PLAYING_S;
 265
 266         /* A thread alread exists, send it a play message */
 267         p_input_thread = libvlc_get_input_thread( p_mi, p_e );
 268
 269         if( libvlc_exception_raised( p_e ) )
 270             return;
 271
 272         input_Control( p_input_thread, INPUT_CONTROL_SET_STATE, PLAYING_S );
 273         vlc_object_release( p_input_thread );
 274         return;
 275     }
 276
 277     if( !p_mi->p_md )
 278     {
 279         libvlc_exception_raise( p_e, "no associated media descriptor" );
 280         return;
 281     }
 282
 283     p_input_thread = input_CreateThread( p_mi->p_libvlc_instance->p_libvlc_int,
 284                                          p_mi->p_md->p_input_item );
 285     p_mi->i_input_id = p_input_thread->i_object_id;
 286
 287     /* will be released in media_instance_release() */
 288     vlc_object_yield( p_input_thread );
 289 }
 290
 291 /**************************************************************************
 292  * Pause
 293  **************************************************************************/
 294 void libvlc_media_instance_pause( libvlc_media_instance_t *p_mi,
 295                                   libvlc_exception_t *p_e )
 296 {
 297     input_thread_t * p_input_thread;
 298     vlc_value_t val;
 299     val.i_int = PAUSE_S;
 300
 301     p_input_thread = libvlc_get_input_thread( p_mi, p_e );
 302
 303     if( libvlc_exception_raised( p_e ) )
 304         return;
 305
 306     input_Control( p_input_thread, INPUT_CONTROL_SET_STATE, val );
 307     vlc_object_release( p_input_thread );
 308 }
 309
 310 /**************************************************************************
 311  * Getters for stream information
 312  **************************************************************************/
 313 vlc_int64_t libvlc_media_instance_get_length(
 314                              libvlc_media_instance_t *p_mi,
 315                              libvlc_exception_t *p_e )
 316 {
 317     input_thread_t *p_input_thread;
 318     vlc_value_t val;
 319
 320     p_input_thread = libvlc_get_input_thread ( p_mi, p_e);
 321     if( !p_input_thread )
 322         return -1;
 323
 324     var_Get( p_input_thread, "length", &val );
 325     vlc_object_release( p_input_thread );
 326
 327     return (val.i_time+500LL)/1000LL;
 328 }
 329
 330 vlc_int64_t libvlc_media_instance_get_time(
 331                                    libvlc_media_instance_t *p_mi,
 332                                    libvlc_exception_t *p_e )
 333 {
 334     input_thread_t *p_input_thread;
 335     vlc_value_t val;
 336
 337     p_input_thread = libvlc_get_input_thread ( p_mi, p_e );
 338     if( !p_input_thread )
 339         return -1;
 340
 341     var_Get( p_input_thread , "time", &val );
 342     vlc_object_release( p_input_thread );
 343     return (val.i_time+500LL)/1000LL;
 344 }
 345
 346 void libvlc_media_instance_set_time(
 347                                  libvlc_media_instance_t *p_mi,
 348                                  vlc_int64_t time,
 349                                  libvlc_exception_t *p_e )
 350 {
 351     input_thread_t *p_input_thread;
 352     vlc_value_t value;
 353
 354     p_input_thread = libvlc_get_input_thread ( p_mi, p_e );
 355     if( !p_input_thread )
 356         return;
 357
 358     value.i_time = time*1000LL;
 359     var_Set( p_input_thread, "time", value );
 360     vlc_object_release( p_input_thread );
 361 }
 362
 363 void libvlc_media_instance_set_position(
 364                                 libvlc_media_instance_t *p_mi,
 365                                 float position,
 366                                 libvlc_exception_t *p_e )
 367 {
 368     input_thread_t *p_input_thread;
 369     vlc_value_t val;
 370     val.f_float = position;
 371
 372     p_input_thread = libvlc_get_input_thread ( p_mi, p_e);
 373     if( !p_input_thread )
 374         return;
 375
 376     var_Set( p_input_thread, "position", val );
 377     vlc_object_release( p_input_thread );
 378 }
 379
 380 float libvlc_media_instance_get_position(
 381                                  libvlc_media_instance_t *p_mi,
 382                                  libvlc_exception_t *p_e )
 383 {
 384     input_thread_t *p_input_thread;
 385     vlc_value_t val;
 386
 387     p_input_thread = libvlc_get_input_thread ( p_mi, p_e );
 388     if( !p_input_thread )
 389         return -1.0;
 390
 391     var_Get( p_input_thread, "position", &val );
 392     vlc_object_release( p_input_thread );
 393
 394     return val.f_float;
 395 }
 396
 397 float libvlc_media_instance_get_fps(
 398                                  libvlc_media_instance_t *p_mi,
 399                                  libvlc_exception_t *p_e)
 400 {
 401     double f_fps = 0.0;
 402     input_thread_t *p_input_thread;
 403
 404     p_input_thread = libvlc_get_input_thread ( p_mi, p_e );
 405     if( !p_input_thread )
 406         return 0.0;
 407
 408     if( (NULL == p_input_thread->p->input.p_demux)
 409         || demux2_Control( p_input_thread->p->input.p_demux, DEMUX_GET_FPS, &f_fps )
 410         || f_fps < 0.1 )
 411     {
 412         vlc_object_release( p_input_thread );
 413         return 0.0;
 414     }
 415     else
 416     {
 417         vlc_object_release( p_input_thread );
 418         return( f_fps );
 419     }
 420 }
 421
 422 vlc_bool_t libvlc_media_instance_will_play(
 423                                  libvlc_media_instance_t *p_mi,
 424                                  libvlc_exception_t *p_e)
 425 {
 426     input_thread_t *p_input_thread =
 427                             libvlc_get_input_thread ( p_mi, p_e);
 428     if ( !p_input_thread )
 429         return VLC_FALSE;
 430
 431     if ( !p_input_thread->b_die && !p_input_thread->b_dead )
 432     {
 433         vlc_object_release( p_input_thread );
 434         return VLC_TRUE;
 435     }
 436     vlc_object_release( p_input_thread );
 437     return VLC_FALSE;
 438 }
 439
 440 void libvlc_media_instance_set_rate(
 441                                  libvlc_media_instance_t *p_mi,
 442                                  float rate,
 443                                  libvlc_exception_t *p_e )
 444 {
 445     input_thread_t *p_input_thread;
 446     vlc_value_t val;
 447
 448     if( rate <= 0 )
 449         RAISEVOID( "Rate value is invalid" );
 450
 451     val.i_int = 1000.0f/rate;
 452
 453     p_input_thread = libvlc_get_input_thread ( p_mi, p_e);
 454     if ( !p_input_thread )
 455         return;
 456
 457     var_Set( p_input_thread, "rate", val );
 458     vlc_object_release( p_input_thread );
 459 }
 460
 461 float libvlc_media_instance_get_rate(
 462                                  libvlc_media_instance_t *p_mi,
 463                                  libvlc_exception_t *p_e )
 464 {
 465     input_thread_t *p_input_thread;
 466     vlc_value_t val;
 467
 468     p_input_thread = libvlc_get_input_thread ( p_mi, p_e);
 469     if ( !p_input_thread )
 470         return -1.0;
 471
 472     var_Get( p_input_thread, "rate", &val );
 473     vlc_object_release( p_input_thread );
 474
 475     return (float)1000.0f/val.i_int;
 476 }
 477
 478 int libvlc_media_instance_get_state(
 479                                  libvlc_media_instance_t *p_mi,
 480                                  libvlc_exception_t *p_e )
 481 {
 482     input_thread_t *p_input_thread;
 483     vlc_value_t val;
 484
 485     p_input_thread = libvlc_get_input_thread ( p_mi, p_e );
 486     if ( !p_input_thread )
 487         return 0;
 488
 489     var_Get( p_input_thread, "state", &val );
 490     vlc_object_release( p_input_thread );
 491
 492     return val.i_int;
 493 }
 494