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libvlc: add two functions
[vlc] / src / control / media.c
1 /*****************************************************************************
2  * media.c: Libvlc API media descripor management
3  *****************************************************************************
4  * Copyright (C) 2007 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Pierre d'Herbemont <pdherbemont@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 #ifdef HAVE_CONFIG_H
25 # include "config.h"
26 #endif
27
28 #include <assert.h>
29
30 #include <vlc/libvlc.h>
31 #include <vlc/libvlc_media.h>
32 #include <vlc/libvlc_media_list.h> // For the subitems, here for convenience
33 #include <vlc/libvlc_events.h>
34
35 #include <vlc_common.h>
36 #include <vlc_input.h>
37 #include <vlc_meta.h>
38 #include <vlc_playlist.h> /* For the preparser */
39
40 #include "libvlc.h"
41
42 #include "libvlc_internal.h"
43 #include "media_internal.h"
44
45 static const vlc_meta_type_t libvlc_to_vlc_meta[] =
46 {
47     [libvlc_meta_Title]        = vlc_meta_Title,
48     [libvlc_meta_Artist]       = vlc_meta_Artist,
49     [libvlc_meta_Genre]        = vlc_meta_Genre,
50     [libvlc_meta_Copyright]    = vlc_meta_Copyright,
51     [libvlc_meta_Album]        = vlc_meta_Album,
52     [libvlc_meta_TrackNumber]  = vlc_meta_TrackNumber,
53     [libvlc_meta_Description]  = vlc_meta_Description,
54     [libvlc_meta_Rating]       = vlc_meta_Rating,
55     [libvlc_meta_Date]         = vlc_meta_Date,
56     [libvlc_meta_Setting]      = vlc_meta_Setting,
57     [libvlc_meta_URL]          = vlc_meta_URL,
58     [libvlc_meta_Language]     = vlc_meta_Language,
59     [libvlc_meta_NowPlaying]   = vlc_meta_NowPlaying,
60     [libvlc_meta_Publisher]    = vlc_meta_Publisher,
61     [libvlc_meta_EncodedBy]    = vlc_meta_EncodedBy,
62     [libvlc_meta_ArtworkURL]   = vlc_meta_ArtworkURL,
63     [libvlc_meta_TrackID]      = vlc_meta_TrackID
64 };
65
66 static const libvlc_meta_t vlc_to_libvlc_meta[] =
67 {
68     [vlc_meta_Title]        = libvlc_meta_Title,
69     [vlc_meta_Artist]       = libvlc_meta_Artist,
70     [vlc_meta_Genre]        = libvlc_meta_Genre,
71     [vlc_meta_Copyright]    = libvlc_meta_Copyright,
72     [vlc_meta_Album]        = libvlc_meta_Album,
73     [vlc_meta_TrackNumber]  = libvlc_meta_TrackNumber,
74     [vlc_meta_Description]  = libvlc_meta_Description,
75     [vlc_meta_Rating]       = libvlc_meta_Rating,
76     [vlc_meta_Date]         = libvlc_meta_Date,
77     [vlc_meta_Setting]      = libvlc_meta_Setting,
78     [vlc_meta_URL]          = libvlc_meta_URL,
79     [vlc_meta_Language]     = libvlc_meta_Language,
80     [vlc_meta_NowPlaying]   = libvlc_meta_NowPlaying,
81     [vlc_meta_Publisher]    = libvlc_meta_Publisher,
82     [vlc_meta_EncodedBy]    = libvlc_meta_EncodedBy,
83     [vlc_meta_ArtworkURL]   = libvlc_meta_ArtworkURL,
84     [vlc_meta_TrackID]      = libvlc_meta_TrackID
85 };
86
87 /**************************************************************************
88  * input_item_subitem_added (Private) (vlc event Callback)
89  **************************************************************************/
90 static void input_item_subitem_added( const vlc_event_t *p_event,
91                                        void * user_data )
92 {
93     libvlc_media_t * p_md = user_data;
94     libvlc_media_t * p_md_child;
95     libvlc_event_t event;
96
97     p_md_child = libvlc_media_new_from_input_item(
98                 p_md->p_libvlc_instance,
99                 p_event->u.input_item_subitem_added.p_new_child, NULL );
100
101     /* Add this to our media list */
102     if( !p_md->p_subitems )
103     {
104         p_md->p_subitems = libvlc_media_list_new( p_md->p_libvlc_instance, NULL );
105         libvlc_media_list_set_media( p_md->p_subitems, p_md, NULL );
106     }
107     if( p_md->p_subitems )
108     {
109         libvlc_media_list_add_media( p_md->p_subitems, p_md_child, NULL );
110     }
111
112     /* Construct the event */
113     event.type = libvlc_MediaSubItemAdded;
114     event.u.media_subitem_added.new_child = p_md_child;
115
116     /* Send the event */
117     libvlc_event_send( p_md->p_event_manager, &event );
118     libvlc_media_release( p_md_child );
119 }
120
121 /**************************************************************************
122  * input_item_meta_changed (Private) (vlc event Callback)
123  **************************************************************************/
124 static void input_item_meta_changed( const vlc_event_t *p_event,
125                                      void * user_data )
126 {
127     libvlc_media_t * p_md = user_data;
128     libvlc_event_t event;
129
130     /* Construct the event */
131     event.type = libvlc_MediaMetaChanged;
132     event.u.media_meta_changed.meta_type =
133         vlc_to_libvlc_meta[p_event->u.input_item_meta_changed.meta_type];
134
135     /* Send the event */
136     libvlc_event_send( p_md->p_event_manager, &event );
137 }
138
139 /**************************************************************************
140  * input_item_duration_changed (Private) (vlc event Callback)
141  **************************************************************************/
142 static void input_item_duration_changed( const vlc_event_t *p_event,
143                                          void * user_data )
144 {
145     libvlc_media_t * p_md = user_data;
146     libvlc_event_t event;
147
148     /* Construct the event */
149     event.type = libvlc_MediaDurationChanged;
150     event.u.media_duration_changed.new_duration = 
151         p_event->u.input_item_duration_changed.new_duration;
152
153     /* Send the event */
154     libvlc_event_send( p_md->p_event_manager, &event );
155 }
156
157 /**************************************************************************
158  * input_item_preparsed_changed (Private) (vlc event Callback)
159  **************************************************************************/
160 static void input_item_preparsed_changed( const vlc_event_t *p_event,
161                                           void * user_data )
162 {
163     libvlc_media_t * p_md = user_data;
164     libvlc_event_t event;
165
166     /* Construct the event */
167     event.type = libvlc_MediaPreparsedChanged;
168     event.u.media_preparsed_changed.new_status = 
169         p_event->u.input_item_preparsed_changed.new_status;
170
171     /* Send the event */
172     libvlc_event_send( p_md->p_event_manager, &event );
173 }
174
175 /**************************************************************************
176  * Install event handler (Private)
177  **************************************************************************/
178 static void install_input_item_observer( libvlc_media_t *p_md )
179 {
180     vlc_event_attach( &p_md->p_input_item->event_manager,
181                       vlc_InputItemSubItemAdded,
182                       input_item_subitem_added,
183                       p_md );
184     vlc_event_attach( &p_md->p_input_item->event_manager,
185                       vlc_InputItemMetaChanged,
186                       input_item_meta_changed,
187                       p_md );
188     vlc_event_attach( &p_md->p_input_item->event_manager,
189                       vlc_InputItemDurationChanged,
190                       input_item_duration_changed,
191                       p_md );
192     vlc_event_attach( &p_md->p_input_item->event_manager,
193                       vlc_InputItemPreparsedChanged,
194                       input_item_preparsed_changed,
195                       p_md );
196 }
197
198 /**************************************************************************
199  * Uninstall event handler (Private)
200  **************************************************************************/
201 static void uninstall_input_item_observer( libvlc_media_t *p_md )
202 {
203     vlc_event_detach( &p_md->p_input_item->event_manager,
204                       vlc_InputItemSubItemAdded,
205                       input_item_subitem_added,
206                       p_md );
207     vlc_event_detach( &p_md->p_input_item->event_manager,
208                       vlc_InputItemMetaChanged,
209                       input_item_meta_changed,
210                       p_md );
211     vlc_event_detach( &p_md->p_input_item->event_manager,
212                       vlc_InputItemDurationChanged,
213                       input_item_duration_changed,
214                       p_md );
215     vlc_event_detach( &p_md->p_input_item->event_manager,
216                       vlc_InputItemPreparsedChanged,
217                       input_item_preparsed_changed,
218                       p_md );
219 }
220
221 /**************************************************************************
222  * Preparse if not already done (Private)
223  **************************************************************************/
224 static void preparse_if_needed( libvlc_media_t *p_md )
225 {
226     /* XXX: need some locking here */
227     if (!p_md->b_preparsed)
228     {
229         playlist_PreparseEnqueue(
230                 libvlc_priv (p_md->p_libvlc_instance->p_libvlc_int)->p_playlist,
231                 p_md->p_input_item, pl_Unlocked );
232         p_md->b_preparsed = true;
233     }
234 }
235
236 /**************************************************************************
237  * Create a new media descriptor object from an input_item
238  * (libvlc internal)
239  * That's the generic constructor
240  **************************************************************************/
241 libvlc_media_t * libvlc_media_new_from_input_item(
242                                    libvlc_instance_t *p_instance,
243                                    input_item_t *p_input_item,
244                                    libvlc_exception_t *p_e )
245 {
246     libvlc_media_t * p_md;
247
248     if (!p_input_item)
249     {
250         libvlc_exception_raise( p_e );
251         libvlc_printerr( "No input item given" );
252         return NULL;
253     }
254
255     p_md = malloc( sizeof(libvlc_media_t) );
256     if( !p_md )
257     {
258         libvlc_exception_raise( p_e );
259         libvlc_printerr( "Not enough memory" );
260         return NULL;
261     }
262
263     p_md->p_libvlc_instance = p_instance;
264     p_md->p_input_item      = p_input_item;
265     p_md->b_preparsed       = false;
266     p_md->i_refcount        = 1;
267     p_md->p_user_data       = NULL;
268
269     p_md->state = libvlc_NothingSpecial;
270
271     /* A media descriptor can be a playlist. When you open a playlist
272      * It can give a bunch of item to read. */
273     p_md->p_subitems        = NULL;
274
275     p_md->p_event_manager = libvlc_event_manager_new( p_md, p_instance, p_e );
276     libvlc_event_manager_register_event_type( p_md->p_event_manager,
277         libvlc_MediaMetaChanged, p_e );
278     libvlc_event_manager_register_event_type( p_md->p_event_manager,
279         libvlc_MediaSubItemAdded, p_e );
280     libvlc_event_manager_register_event_type( p_md->p_event_manager,
281         libvlc_MediaFreed, p_e );
282     libvlc_event_manager_register_event_type( p_md->p_event_manager,
283         libvlc_MediaDurationChanged, p_e );
284     libvlc_event_manager_register_event_type( p_md->p_event_manager,
285         libvlc_MediaStateChanged, p_e );
286
287     vlc_gc_incref( p_md->p_input_item );
288
289     install_input_item_observer( p_md );
290
291     return p_md;
292 }
293
294 /**************************************************************************
295  * Create a new media descriptor object
296  **************************************************************************/
297 libvlc_media_t * libvlc_media_new(
298                                    libvlc_instance_t *p_instance,
299                                    const char * psz_mrl,
300                                    libvlc_exception_t *p_e )
301 {
302     input_item_t * p_input_item;
303     libvlc_media_t * p_md;
304
305     p_input_item = input_item_New( p_instance->p_libvlc_int, psz_mrl, NULL );
306
307     if (!p_input_item)
308     {
309         libvlc_exception_raise( p_e );
310         libvlc_printerr( "Not enough memory" );
311         return NULL;
312     }
313
314     p_md = libvlc_media_new_from_input_item( p_instance,
315                 p_input_item, p_e );
316
317     /* The p_input_item is retained in libvlc_media_new_from_input_item */
318     vlc_gc_decref( p_input_item );
319
320     return p_md;
321 }
322
323 /**************************************************************************
324  * Create a new media descriptor object
325  **************************************************************************/
326 libvlc_media_t * libvlc_media_new_as_node(
327                                    libvlc_instance_t *p_instance,
328                                    const char * psz_name,
329                                    libvlc_exception_t *p_e )
330 {
331     input_item_t * p_input_item;
332     libvlc_media_t * p_md;
333
334     p_input_item = input_item_New( p_instance->p_libvlc_int, "vlc://nop", psz_name );
335
336     if (!p_input_item)
337     {
338         libvlc_exception_raise( p_e );
339         libvlc_printerr( "Not enough memory" );
340         return NULL;
341     }
342
343     p_md = libvlc_media_new_from_input_item( p_instance,
344                 p_input_item, p_e );
345
346     p_md->p_subitems = libvlc_media_list_new( p_md->p_libvlc_instance, NULL );
347
348     return p_md;
349 }
350
351 /**************************************************************************
352  * Add an option to the media descriptor,
353  * that will be used to determine how the media_player will read the
354  * media. This allow to use VLC advanced reading/streaming
355  * options in a per-media basis
356  *
357  * The options are detailled in vlc --long-help, for instance "--sout-all"
358  **************************************************************************/
359 void libvlc_media_add_option(
360                                    libvlc_media_t * p_md,
361                                    const char * psz_option )
362 {
363     input_item_AddOption( p_md->p_input_item, psz_option,
364                           VLC_INPUT_OPTION_UNIQUE|VLC_INPUT_OPTION_TRUSTED );
365 }
366
367 /**************************************************************************
368  * Same as libvlc_media_add_option but with configurable flags.
369  **************************************************************************/
370 void libvlc_media_add_option_flag(
371                                    libvlc_media_t * p_md,
372                                    const char * ppsz_option,
373                                    libvlc_media_option_t i_flags )
374 {
375     input_item_AddOption( p_md->p_input_item, ppsz_option,
376                           i_flags );
377 }
378
379 /**************************************************************************
380  * Delete a media descriptor object
381  **************************************************************************/
382 void libvlc_media_release( libvlc_media_t *p_md )
383 {
384     if (!p_md)
385         return;
386
387     p_md->i_refcount--;
388
389     if( p_md->i_refcount > 0 )
390         return;
391
392     if( p_md->p_subitems )
393         libvlc_media_list_release( p_md->p_subitems );
394
395     uninstall_input_item_observer( p_md );
396     vlc_gc_decref( p_md->p_input_item );
397
398     /* Construct the event */
399     libvlc_event_t event;
400     event.type = libvlc_MediaFreed;
401     event.u.media_freed.md = p_md;
402
403     /* Send the event */
404     libvlc_event_send( p_md->p_event_manager, &event );
405
406     libvlc_event_manager_release( p_md->p_event_manager );
407
408     free( p_md );
409 }
410
411 /**************************************************************************
412  * Retain a media descriptor object
413  **************************************************************************/
414 void libvlc_media_retain( libvlc_media_t *p_md )
415 {
416     assert (p_md);
417     p_md->i_refcount++;
418 }
419
420 /**************************************************************************
421  * Duplicate a media descriptor object
422  **************************************************************************/
423 libvlc_media_t *
424 libvlc_media_duplicate( libvlc_media_t *p_md_orig )
425 {
426     return libvlc_media_new_from_input_item(
427         p_md_orig->p_libvlc_instance, p_md_orig->p_input_item, NULL );
428 }
429
430 /**************************************************************************
431  * Get mrl from a media descriptor object
432  **************************************************************************/
433 char *
434 libvlc_media_get_mrl( libvlc_media_t * p_md )
435 {
436     assert( p_md );
437     return input_item_GetURI( p_md->p_input_item );
438 }
439
440 /**************************************************************************
441  * Getter for meta information
442  **************************************************************************/
443
444 char *libvlc_media_get_meta( libvlc_media_t *p_md, libvlc_meta_t e_meta )
445 {
446     char * psz_meta;
447
448     assert( p_md );
449     /* XXX: locking */
450
451     preparse_if_needed( p_md );
452
453     psz_meta = input_item_GetMeta( p_md->p_input_item,
454                                    libvlc_to_vlc_meta[e_meta] );
455
456     if( e_meta == libvlc_meta_ArtworkURL && !psz_meta )
457     {
458         playlist_AskForArtEnqueue(
459                 libvlc_priv(p_md->p_libvlc_instance->p_libvlc_int)->p_playlist,
460                 p_md->p_input_item, pl_Unlocked );
461     }
462
463     /* Should be integrated in core */
464     if( !psz_meta && e_meta == libvlc_meta_Title && p_md->p_input_item->psz_name )
465     {
466         free( psz_meta );
467         return strdup( p_md->p_input_item->psz_name );
468     }
469
470     return psz_meta;
471 }
472
473 /**************************************************************************
474  * Setter for meta information
475  **************************************************************************/
476
477 void libvlc_media_set_meta( libvlc_media_t *p_md, libvlc_meta_t e_meta, const char *psz_value )
478 {
479     assert( p_md );
480     input_item_SetMeta( p_md->p_input_item, libvlc_to_vlc_meta[e_meta], psz_value );
481 }
482
483 int libvlc_media_save_meta( libvlc_media_t *p_md )
484 {
485     assert( p_md );
486     vlc_object_t *p_obj = VLC_OBJECT(libvlc_priv(
487                             p_md->p_libvlc_instance->p_libvlc_int)->p_playlist);
488     return input_item_WriteMeta( p_obj, p_md->p_input_item ) == VLC_SUCCESS;
489 }
490
491 /**************************************************************************
492  * Getter for state information
493  * Can be error, playing, buffering, NothingSpecial.
494  **************************************************************************/
495
496 libvlc_state_t
497 libvlc_media_get_state( libvlc_media_t *p_md )
498 {
499     assert( p_md );
500     return p_md->state;
501 }
502
503 /**************************************************************************
504  * Setter for state information (LibVLC Internal)
505  **************************************************************************/
506
507 void
508 libvlc_media_set_state( libvlc_media_t *p_md,
509                                    libvlc_state_t state )
510 {
511     libvlc_event_t event;
512
513     p_md->state = state;
514
515     /* Construct the event */
516     event.type = libvlc_MediaStateChanged;
517     event.u.media_state_changed.new_state = state;
518
519     /* Send the event */
520     libvlc_event_send( p_md->p_event_manager, &event );
521 }
522
523 /**************************************************************************
524  * subitems
525  **************************************************************************/
526 libvlc_media_list_t *
527 libvlc_media_subitems( libvlc_media_t * p_md )
528 {
529     if( p_md->p_subitems )
530         libvlc_media_list_retain( p_md->p_subitems );
531     return p_md->p_subitems;
532 }
533
534 /**************************************************************************
535  * Getter for statistics information
536  **************************************************************************/
537 int libvlc_media_get_stats( libvlc_media_t *p_md,
538                             libvlc_media_stats_t *p_stats )
539 {
540     if( !p_md->p_input_item )
541         return false;
542
543     input_stats_t *p_itm_stats = p_md->p_input_item->p_stats;
544     vlc_mutex_lock( &p_itm_stats->lock );
545     p_stats->i_read_bytes = p_itm_stats->i_read_bytes;
546     p_stats->f_input_bitrate = p_itm_stats->f_input_bitrate;
547
548     p_stats->i_demux_read_bytes = p_itm_stats->i_demux_read_bytes;
549     p_stats->f_demux_bitrate = p_itm_stats->f_demux_bitrate;
550     p_stats->i_demux_corrupted = p_itm_stats->i_demux_corrupted;
551     p_stats->i_demux_discontinuity = p_itm_stats->i_demux_discontinuity;
552
553     p_stats->i_decoded_video = p_itm_stats->i_decoded_video;
554     p_stats->i_decoded_audio = p_itm_stats->i_decoded_audio;
555
556     p_stats->i_displayed_pictures = p_itm_stats->i_displayed_pictures;
557     p_stats->i_lost_pictures = p_itm_stats->i_lost_pictures;
558
559     p_stats->i_played_abuffers = p_itm_stats->i_played_abuffers;
560     p_stats->i_lost_abuffers = p_itm_stats->i_lost_abuffers;
561
562     p_stats->i_sent_packets = p_itm_stats->i_sent_packets;
563     p_stats->i_sent_bytes = p_itm_stats->i_sent_bytes;
564     p_stats->f_send_bitrate = p_itm_stats->f_send_bitrate;
565     vlc_mutex_unlock( &p_itm_stats->lock );
566     return true;
567 }
568
569 /**************************************************************************
570  * event_manager
571  **************************************************************************/
572 libvlc_event_manager_t *
573 libvlc_media_event_manager( libvlc_media_t * p_md )
574 {
575     assert( p_md );
576
577     return p_md->p_event_manager;
578 }
579
580 /**************************************************************************
581  * Get duration of media object (in ms)
582  **************************************************************************/
583 int64_t
584 libvlc_media_get_duration( libvlc_media_t * p_md, libvlc_exception_t *p_e )
585 {
586     assert( p_md );
587
588     if( !p_md->p_input_item )
589     {
590         libvlc_exception_raise( p_e );
591         libvlc_printerr( "No input item" );
592         return -1;
593     }
594
595     return input_item_GetDuration( p_md->p_input_item ) / 1000;
596 }
597
598 /**************************************************************************
599  * Get preparsed status for media object.
600  **************************************************************************/
601 int
602 libvlc_media_is_preparsed( libvlc_media_t * p_md )
603 {
604     assert( p_md );
605
606     if( !p_md->p_input_item )
607         return false;
608
609     return input_item_IsPreparsed( p_md->p_input_item );
610 }
611
612 /**************************************************************************
613  * Sets media descriptor's user_data. user_data is specialized data 
614  * accessed by the host application, VLC.framework uses it as a pointer to 
615  * an native object that references a libvlc_media_t pointer
616  **************************************************************************/
617 void 
618 libvlc_media_set_user_data( libvlc_media_t * p_md, void * p_new_user_data )
619 {
620     assert( p_md );
621     p_md->p_user_data = p_new_user_data;
622 }
623
624 /**************************************************************************
625  * Get media descriptor's user_data. user_data is specialized data 
626  * accessed by the host application, VLC.framework uses it as a pointer to 
627  * an native object that references a libvlc_media_t pointer
628  **************************************************************************/
629 void *
630 libvlc_media_get_user_data( libvlc_media_t * p_md )
631 {
632     assert( p_md );
633     return p_md->p_user_data;
634 }