相超來了

struct libvlc_media_t

{

libvlc_event_manager_t * p_event_manager;

int b_preparsed;

input_item_t *p_input_item;

int i_refcount;

libvlc_instance_t *p_libvlc_instance;

libvlc_state_t state;

VLC_FORWARD_DECLARE_OBJECT(libvlc_media_list_t*) p_subitems; /* A media descriptor can have Sub items. This is the only dependancy we really have on media_list */

void *p_user_data;

};

struct libvlc_media_player_t

{

int i_refcount;

vlc_mutex_t object_lock;

input_thread_t * p_input_thread;

struct libvlc_instance_t * p_libvlc_instance; /* Parent instance */

libvlc_media_t * p_md; /* current media descriptor */

libvlc_event_manager_t * p_event_manager;

struct

{

void *hwnd;

void *nsobject;

uint32_t xid;

uint32_t agl;

} drawable;

bool b_own_its_input_thread;

};

struct libvlc_instance_t

{

libvlc_int_t *p_libvlc_int;

vlm_t *p_vlm;

int b_playlist_locked;

unsigned ref_count;

int verbosity;

vlc_mutex_t instance_lock;

vlc_mutex_t event_callback_lock;

struct libvlc_callback_entry_list_t *p_callback_list;

};

in control/audio.c

static aout_instance_t *GetAOut( libvlc_instance_t *p_instance,

libvlc_exception_t *p_exception )

{

if( !p_instance )

return NULL;

aout_instance_t * p_aout = NULL;

p_aout = vlc_object_find( p_instance->p_libvlc_int, VLC_OBJECT_AOUT, FIND_CHILD );

if( !p_aout )

{

libvlc_exception_raise( p_exception, "No active audio output" );

return NULL;

}

return p_aout;

}

Libvlc詳細過程

///////////////////////////////////////////////////////////////////////

libvlc_instance_t * libvlc_new( int argc, const char *const *argv,

libvlc_exception_t *p_e )

{

libvlc_instance_t *p_new;

int i_ret;

libvlc_int_t *p_libvlc_int = libvlc_InternalCreate();

if( !p_libvlc_int ) RAISENULL( "VLC initialization failed" );

p_new = malloc( sizeof( libvlc_instance_t ) );

if( !p_new ) RAISENULL( "Out of memory" );

const char *my_argv[argc + 2];

my_argv[0] = "libvlc"; /* dummy arg0, skipped by getopt() et al */

for( int i = 0; i < argc; i++ )

my_argv[i + 1] = argv[i];

my_argv[argc + 1] = NULL; /* C calling conventions require a NULL */

/** \todo Look for interface settings. If we don't have any, add -I dummy */

/* Because we probably don't want a GUI by default */

i_ret = libvlc_InternalInit( p_libvlc_int, argc + 1, my_argv );

if( i_ret )

{

libvlc_InternalDestroy( p_libvlc_int );

free( p_new );

if( i_ret == VLC_EEXITSUCCESS )

return NULL;

else

RAISENULL( "VLC initialization failed" );

}

p_new->p_libvlc_int = p_libvlc_int;

p_new->p_vlm = NULL;

p_new->b_playlist_locked = 0;

p_new->ref_count = 1;

p_new->verbosity = 1;

p_new->p_callback_list = NULL;

vlc_mutex_init(&p_new->instance_lock);

vlc_mutex_init(&p_new->event_callback_lock);

return p_new;

}

////////////////////////////////////////////////////////////

libvlc_media_t * libvlc_media_new_from_input_item(

libvlc_instance_t *p_instance,

input_item_t *p_input_item,

libvlc_exception_t *p_e )

{

libvlc_media_t * p_md;

if (!p_input_item)

{

libvlc_exception_raise( p_e, "No input item given" );

return NULL;

}

p_md = malloc( sizeof(libvlc_media_t) );

if( !p_md )

{

libvlc_exception_raise( p_e, "Not enough memory" );

return NULL;

}

p_md->p_libvlc_instance = p_instance;

p_md->p_input_item = p_input_item;

p_md->b_preparsed = false;

p_md->i_refcount = 1;

p_md->p_user_data = NULL;

p_md->state = libvlc_NothingSpecial;

/* A media descriptor can be a playlist. When you open a playlist

* It can give a bunch of item to read. */

p_md->p_subitems = NULL;

p_md->p_event_manager = libvlc_event_manager_new( p_md, p_instance, p_e );