variables.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:47k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * variables.c: routines for object variables handling
- *****************************************************************************
- * Copyright (C) 2002-2006 the VideoLAN team
- * $Id: f045a51899f8a32d09dca3bc989d40eb9a5960a7 $
- *
- * Authors: Samuel Hocevar <sam@zoy.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_charset.h>
- #include "variables.h"
- #include "libvlc.h"
- #include "vlc_interface.h"
- #include <assert.h>
- /*****************************************************************************
- * Private types
- *****************************************************************************/
- struct callback_entry_t
- {
- vlc_callback_t pf_callback;
- void * p_data;
- };
- /*****************************************************************************
- * Local comparison functions, returns 0 if v == w, < 0 if v < w, > 0 if v > w
- *****************************************************************************/
- static int CmpBool( vlc_value_t v, vlc_value_t w ) { return v.b_bool ? w.b_bool ? 0 : 1 : w.b_bool ? -1 : 0; }
- static int CmpInt( vlc_value_t v, vlc_value_t w ) { return v.i_int == w.i_int ? 0 : v.i_int > w.i_int ? 1 : -1; }
- static int CmpTime( vlc_value_t v, vlc_value_t w )
- {
- return v.i_time == w.i_time ? 0 : v.i_time > w.i_time ? 1 : -1;
- }
- static int CmpString( vlc_value_t v, vlc_value_t w )
- {
- if( !v.psz_string )
- return !w.psz_string ? 0 : -1;
- else
- return !w.psz_string ? 1 : strcmp( v.psz_string, w.psz_string );
- }
- static int CmpFloat( vlc_value_t v, vlc_value_t w ) { return v.f_float == w.f_float ? 0 : v.f_float > w.f_float ? 1 : -1; }
- static int CmpAddress( vlc_value_t v, vlc_value_t w ) { return v.p_address == w.p_address ? 0 : v.p_address > w.p_address ? 1 : -1; }
- /*****************************************************************************
- * Local duplication functions, and local deallocation functions
- *****************************************************************************/
- static void DupDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
- static void DupString( vlc_value_t *p_val )
- {
- p_val->psz_string = strdup( p_val->psz_string ? p_val->psz_string : "" );
- }
- static void DupList( vlc_value_t *p_val )
- {
- int i;
- vlc_list_t *p_list = malloc( sizeof(vlc_list_t) );
- p_list->i_count = p_val->p_list->i_count;
- if( p_val->p_list->i_count )
- {
- p_list->p_values = malloc( p_list->i_count * sizeof(vlc_value_t) );
- p_list->pi_types = malloc( p_list->i_count * sizeof(int) );
- }
- else
- {
- p_list->p_values = NULL;
- p_list->pi_types = NULL;
- }
- for( i = 0; i < p_list->i_count; i++ )
- {
- p_list->p_values[i] = p_val->p_list->p_values[i];
- p_list->pi_types[i] = p_val->p_list->pi_types[i];
- switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
- {
- case VLC_VAR_STRING:
- DupString( &p_list->p_values[i] );
- break;
- default:
- break;
- }
- }
- p_val->p_list = p_list;
- }
- static void FreeDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
- static void FreeString( vlc_value_t *p_val ) { free( p_val->psz_string ); }
- static void FreeMutex( vlc_value_t *p_val ) { vlc_mutex_destroy( (vlc_mutex_t*)p_val->p_address ); free( p_val->p_address ); }
- static void FreeList( vlc_value_t *p_val )
- {
- int i;
- for( i = 0; i < p_val->p_list->i_count; i++ )
- {
- switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
- {
- case VLC_VAR_STRING:
- FreeString( &p_val->p_list->p_values[i] );
- break;
- case VLC_VAR_MUTEX:
- FreeMutex( &p_val->p_list->p_values[i] );
- break;
- default:
- break;
- }
- }
- if( p_val->p_list->i_count )
- {
- free( p_val->p_list->p_values );
- free( p_val->p_list->pi_types );
- }
- free( p_val->p_list );
- }
- static const struct variable_ops_t
- void_ops = { NULL, DupDummy, FreeDummy, },
- addr_ops = { CmpAddress, DupDummy, FreeDummy, },
- bool_ops = { CmpBool, DupDummy, FreeDummy, },
- float_ops = { CmpFloat, DupDummy, FreeDummy, },
- int_ops = { CmpInt, DupDummy, FreeDummy, },
- list_ops = { CmpAddress, DupList, FreeList, },
- mutex_ops = { CmpAddress, DupDummy, FreeMutex, },
- string_ops = { CmpString, DupString, FreeString, },
- time_ops = { CmpTime, DupDummy, FreeDummy, };
- /*****************************************************************************
- * Local prototypes
- *****************************************************************************/
- static int GetUnused ( vlc_object_t *, const char * );
- static uint32_t HashString ( const char * );
- static int Insert ( variable_t *, int, const char * );
- static int InsertInner ( variable_t *, int, uint32_t );
- static int Lookup ( variable_t *, size_t, const char * );
- static void CheckValue ( variable_t *, vlc_value_t * );
- static int InheritValue( vlc_object_t *, const char *, vlc_value_t *,
- int );
- /**
- * Initialize a vlc variable
- *
- * We hash the given string and insert it into the sorted list. The insertion
- * may require slow memory copies, but think about what we gain in the log(n)
- * lookup phase when setting/getting the variable value!
- *
- * param p_this The object in which to create the variable
- * param psz_name The name of the variable
- * param i_type The variables type. Must be one of ref var_type combined with
- * zero or more ref var_flags
- */
- int __var_Create( vlc_object_t *p_this, const char *psz_name, int i_type )
- {
- int i_new;
- variable_t *p_var;
- static vlc_list_t dummy_null_list = {0, NULL, NULL};
- vlc_object_internals_t *p_priv = vlc_internals( p_this );
- vlc_mutex_lock( &p_priv->var_lock );
- /* FIXME: if the variable already exists, we don't duplicate it. But we
- * duplicate the lookups. It's not that serious, but if anyone finds some
- * time to rework Insert() so that only one lookup has to be done, feel
- * free to do so. */
- i_new = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
- if( i_new >= 0 )
- {
- /* If the types differ, variable creation failed. */
- if( (i_type & ~(VLC_VAR_DOINHERIT|VLC_VAR_ISCOMMAND)) != p_priv->p_vars[i_new].i_type )
- {
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_EBADVAR;
- }
- p_priv->p_vars[i_new].i_usage++;
- if( i_type & VLC_VAR_ISCOMMAND )
- p_priv->p_vars[i_new].i_type |= VLC_VAR_ISCOMMAND;
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_SUCCESS;
- }
- i_new = Insert( p_priv->p_vars, p_priv->i_vars, psz_name );
- if( (p_priv->i_vars & 15) == 15 )
- {
- p_priv->p_vars = realloc( p_priv->p_vars,
- (p_priv->i_vars+17) * sizeof(variable_t) );
- }
- memmove( p_priv->p_vars + i_new + 1,
- p_priv->p_vars + i_new,
- (p_priv->i_vars - i_new) * sizeof(variable_t) );
- p_priv->i_vars++;
- p_var = &p_priv->p_vars[i_new];
- memset( p_var, 0, sizeof(*p_var) );
- p_var->i_hash = HashString( psz_name );
- p_var->psz_name = strdup( psz_name );
- p_var->psz_text = NULL;
- p_var->i_type = i_type & ~VLC_VAR_DOINHERIT;
- memset( &p_var->val, 0, sizeof(vlc_value_t) );
- p_var->i_usage = 1;
- p_var->i_default = -1;
- p_var->choices.i_count = 0;
- p_var->choices.p_values = NULL;
- p_var->choices_text.i_count = 0;
- p_var->choices_text.p_values = NULL;
- p_var->b_incallback = false;
- p_var->i_entries = 0;
- p_var->p_entries = NULL;
- /* Always initialize the variable, even if it is a list variable; this
- * will lead to errors if the variable is not initialized, but it will
- * not cause crashes in the variable handling. */
- switch( i_type & VLC_VAR_CLASS )
- {
- case VLC_VAR_BOOL:
- p_var->ops = &bool_ops;
- p_var->val.b_bool = false;
- break;
- case VLC_VAR_INTEGER:
- p_var->ops = &int_ops;
- p_var->val.i_int = 0;
- break;
- case VLC_VAR_STRING:
- p_var->ops = &string_ops;
- p_var->val.psz_string = NULL;
- break;
- case VLC_VAR_FLOAT:
- p_var->ops = &float_ops;
- p_var->val.f_float = 0.0;
- break;
- case VLC_VAR_TIME:
- p_var->ops = &time_ops;
- p_var->val.i_time = 0;
- break;
- case VLC_VAR_ADDRESS:
- p_var->ops = &addr_ops;
- p_var->val.p_address = NULL;
- break;
- case VLC_VAR_MUTEX:
- p_var->ops = &mutex_ops;
- p_var->val.p_address = malloc( sizeof(vlc_mutex_t) );
- vlc_mutex_init( (vlc_mutex_t*)p_var->val.p_address );
- break;
- case VLC_VAR_LIST:
- p_var->ops = &list_ops;
- p_var->val.p_list = &dummy_null_list;
- break;
- default:
- p_var->ops = &void_ops;
- break;
- }
- /* Duplicate the default data we stored. */
- p_var->ops->pf_dup( &p_var->val );
- if( i_type & VLC_VAR_DOINHERIT )
- {
- vlc_value_t val;
- if( InheritValue( p_this, psz_name, &val, p_var->i_type )
- == VLC_SUCCESS )
- {
- /* Free data if needed */
- p_var->ops->pf_free( &p_var->val );
- /* Set the variable */
- p_var->val = val;
- if( i_type & VLC_VAR_HASCHOICE )
- {
- /* We must add the inherited value to our choice list */
- p_var->i_default = 0;
- INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
- 0, val );
- INSERT_ELEM( p_var->choices_text.p_values,
- p_var->choices_text.i_count, 0, val );
- p_var->ops->pf_dup( &p_var->choices.p_values[0] );
- p_var->choices_text.p_values[0].psz_string = NULL;
- }
- }
- }
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_SUCCESS;
- }
- /**
- * Destroy a vlc variable
- *
- * Look for the variable and destroy it if it is found. As in var_Create we
- * do a call to memmove() but we have performance counterparts elsewhere.
- *
- * param p_this The object that holds the variable
- * param psz_name The name of the variable
- */
- int __var_Destroy( vlc_object_t *p_this, const char *psz_name )
- {
- int i_var, i;
- variable_t *p_var;
- vlc_object_internals_t *p_priv = vlc_internals( p_this );
- vlc_mutex_lock( &p_priv->var_lock );
- i_var = GetUnused( p_this, psz_name );
- if( i_var < 0 )
- {
- vlc_mutex_unlock( &p_priv->var_lock );
- return i_var;
- }
- p_var = &p_priv->p_vars[i_var];
- if( p_var->i_usage > 1 )
- {
- p_var->i_usage--;
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_SUCCESS;
- }
- /* Free value if needed */
- p_var->ops->pf_free( &p_var->val );
- /* Free choice list if needed */
- if( p_var->choices.i_count )
- {
- for( i = 0 ; i < p_var->choices.i_count ; i++ )
- {
- p_var->ops->pf_free( &p_var->choices.p_values[i] );
- free( p_var->choices_text.p_values[i].psz_string );
- }
- free( p_var->choices.p_values );
- free( p_var->choices_text.p_values );
- }
- /* Free callbacks if needed */
- if( p_var->p_entries )
- {
- free( p_var->p_entries );
- }
- free( p_var->psz_name );
- free( p_var->psz_text );
- memmove( p_priv->p_vars + i_var,
- p_priv->p_vars + i_var + 1,
- (p_priv->i_vars - i_var - 1) * sizeof(variable_t) );
- if( (p_priv->i_vars & 15) == 0 )
- {
- p_priv->p_vars = realloc( p_priv->p_vars,
- (p_priv->i_vars) * sizeof( variable_t ) );
- }
- p_priv->i_vars--;
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_SUCCESS;
- }
- /**
- * Perform an action on a variable
- *
- * param p_this The object that holds the variable
- * param psz_name The name of the variable
- * param i_action The action to perform. Must be one of ref var_action
- * param p_val First action parameter
- * param p_val2 Second action parameter
- */
- int __var_Change( vlc_object_t *p_this, const char *psz_name,
- int i_action, vlc_value_t *p_val, vlc_value_t *p_val2 )
- {
- int i_var, i;
- variable_t *p_var;
- vlc_value_t oldval;
- vlc_object_internals_t *p_priv = vlc_internals( p_this );
- vlc_mutex_lock( &p_priv->var_lock );
- i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
- if( i_var < 0 )
- {
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_ENOVAR;
- }
- p_var = &p_priv->p_vars[i_var];
- switch( i_action )
- {
- case VLC_VAR_SETMIN:
- if( p_var->i_type & VLC_VAR_HASMIN )
- {
- p_var->ops->pf_free( &p_var->min );
- }
- p_var->i_type |= VLC_VAR_HASMIN;
- p_var->min = *p_val;
- p_var->ops->pf_dup( &p_var->min );
- CheckValue( p_var, &p_var->val );
- break;
- case VLC_VAR_GETMIN:
- if( p_var->i_type & VLC_VAR_HASMIN )
- {
- *p_val = p_var->min;
- }
- break;
- case VLC_VAR_SETMAX:
- if( p_var->i_type & VLC_VAR_HASMAX )
- {
- p_var->ops->pf_free( &p_var->max );
- }
- p_var->i_type |= VLC_VAR_HASMAX;
- p_var->max = *p_val;
- p_var->ops->pf_dup( &p_var->max );
- CheckValue( p_var, &p_var->val );
- break;
- case VLC_VAR_GETMAX:
- if( p_var->i_type & VLC_VAR_HASMAX )
- {
- *p_val = p_var->max;
- }
- break;
- case VLC_VAR_SETSTEP:
- if( p_var->i_type & VLC_VAR_HASSTEP )
- {
- p_var->ops->pf_free( &p_var->step );
- }
- p_var->i_type |= VLC_VAR_HASSTEP;
- p_var->step = *p_val;
- p_var->ops->pf_dup( &p_var->step );
- CheckValue( p_var, &p_var->val );
- break;
- case VLC_VAR_GETSTEP:
- if( p_var->i_type & VLC_VAR_HASSTEP )
- {
- *p_val = p_var->step;
- }
- break;
- case VLC_VAR_ADDCHOICE:
- i = p_var->choices.i_count;
- INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
- i, *p_val );
- INSERT_ELEM( p_var->choices_text.p_values,
- p_var->choices_text.i_count, i, *p_val );
- p_var->ops->pf_dup( &p_var->choices.p_values[i] );
- p_var->choices_text.p_values[i].psz_string =
- ( p_val2 && p_val2->psz_string ) ?
- strdup( p_val2->psz_string ) : NULL;
- CheckValue( p_var, &p_var->val );
- break;
- case VLC_VAR_DELCHOICE:
- for( i = 0 ; i < p_var->choices.i_count ; i++ )
- {
- if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
- {
- break;
- }
- }
- if( i == p_var->choices.i_count )
- {
- /* Not found */
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_EGENERIC;
- }
- if( p_var->i_default > i )
- {
- p_var->i_default--;
- }
- else if( p_var->i_default == i )
- {
- p_var->i_default = -1;
- }
- p_var->ops->pf_free( &p_var->choices.p_values[i] );
- free( p_var->choices_text.p_values[i].psz_string );
- REMOVE_ELEM( p_var->choices.p_values, p_var->choices.i_count, i );
- REMOVE_ELEM( p_var->choices_text.p_values,
- p_var->choices_text.i_count, i );
- CheckValue( p_var, &p_var->val );
- break;
- case VLC_VAR_CHOICESCOUNT:
- p_val->i_int = p_var->choices.i_count;
- break;
- case VLC_VAR_CLEARCHOICES:
- for( i = 0 ; i < p_var->choices.i_count ; i++ )
- {
- p_var->ops->pf_free( &p_var->choices.p_values[i] );
- }
- for( i = 0 ; i < p_var->choices_text.i_count ; i++ )
- free( p_var->choices_text.p_values[i].psz_string );
- if( p_var->choices.i_count ) free( p_var->choices.p_values );
- if( p_var->choices_text.i_count ) free( p_var->choices_text.p_values );
- p_var->choices.i_count = 0;
- p_var->choices.p_values = NULL;
- p_var->choices_text.i_count = 0;
- p_var->choices_text.p_values = NULL;
- p_var->i_default = -1;
- break;
- case VLC_VAR_SETDEFAULT:
- /* FIXME: the list is sorted, dude. Use something cleverer. */
- for( i = 0 ; i < p_var->choices.i_count ; i++ )
- {
- if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
- {
- break;
- }
- }
- if( i == p_var->choices.i_count )
- {
- /* Not found */
- break;
- }
- p_var->i_default = i;
- CheckValue( p_var, &p_var->val );
- break;
- case VLC_VAR_SETVALUE:
- /* Duplicate data if needed */
- p_var->ops->pf_dup( p_val );
- /* Backup needed stuff */
- oldval = p_var->val;
- /* Check boundaries and list */
- CheckValue( p_var, p_val );
- /* Set the variable */
- p_var->val = *p_val;
- /* Free data if needed */
- p_var->ops->pf_free( &oldval );
- break;
- case VLC_VAR_GETCHOICES:
- case VLC_VAR_GETLIST:
- p_val->p_list = malloc( sizeof(vlc_list_t) );
- if( p_val2 ) p_val2->p_list = malloc( sizeof(vlc_list_t) );
- if( p_var->choices.i_count )
- {
- p_val->p_list->p_values = malloc( p_var->choices.i_count
- * sizeof(vlc_value_t) );
- p_val->p_list->pi_types = malloc( p_var->choices.i_count
- * sizeof(int) );
- if( p_val2 )
- {
- p_val2->p_list->p_values =
- malloc( p_var->choices.i_count * sizeof(vlc_value_t) );
- p_val2->p_list->pi_types =
- malloc( p_var->choices.i_count * sizeof(int) );
- }
- }
- p_val->p_list->i_count = p_var->choices.i_count;
- if( p_val2 ) p_val2->p_list->i_count = p_var->choices.i_count;
- for( i = 0 ; i < p_var->choices.i_count ; i++ )
- {
- p_val->p_list->p_values[i] = p_var->choices.p_values[i];
- p_val->p_list->pi_types[i] = p_var->i_type;
- p_var->ops->pf_dup( &p_val->p_list->p_values[i] );
- if( p_val2 )
- {
- p_val2->p_list->p_values[i].psz_string =
- p_var->choices_text.p_values[i].psz_string ?
- strdup(p_var->choices_text.p_values[i].psz_string) : NULL;
- p_val2->p_list->pi_types[i] = VLC_VAR_STRING;
- }
- }
- break;
- case VLC_VAR_FREELIST:
- FreeList( p_val );
- if( p_val2 && p_val2->p_list )
- {
- for( i = 0; i < p_val2->p_list->i_count; i++ )
- free( p_val2->p_list->p_values[i].psz_string );
- if( p_val2->p_list->i_count )
- {
- free( p_val2->p_list->p_values );
- free( p_val2->p_list->pi_types );
- }
- free( p_val2->p_list );
- }
- break;
- case VLC_VAR_SETTEXT:
- free( p_var->psz_text );
- if( p_val && p_val->psz_string )
- p_var->psz_text = strdup( p_val->psz_string );
- else
- p_var->psz_text = NULL;
- break;
- case VLC_VAR_GETTEXT:
- p_val->psz_string = NULL;
- if( p_var->psz_text )
- {
- p_val->psz_string = strdup( p_var->psz_text );
- }
- break;
- case VLC_VAR_INHERITVALUE:
- {
- vlc_value_t val;
- if( InheritValue( p_this,
- p_val2 ? p_val2->psz_string : psz_name,
- &val, p_var->i_type )
- == VLC_SUCCESS )
- {
- /* Duplicate already done */
- /* Backup needed stuff */
- oldval = p_var->val;
- /* Check boundaries and list */
- CheckValue( p_var, &val );
- /* Set the variable */
- p_var->val = val;
- /* Free data if needed */
- p_var->ops->pf_free( &oldval );
- }
- if( p_val )
- {
- *p_val = p_var->val;
- p_var->ops->pf_dup( p_val );
- }
- }
- break;
- case VLC_VAR_SETISCOMMAND:
- p_var->i_type |= VLC_VAR_ISCOMMAND;
- break;
- default:
- break;
- }
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_SUCCESS;
- }
- /**
- * Request a variable's type
- *
- * return The variable type if it exists, or 0 if the
- * variable could not be found.
- * see ref var_type
- */
- int __var_Type( vlc_object_t *p_this, const char *psz_name )
- {
- int i_var, i_type;
- vlc_object_internals_t *p_priv = vlc_internals( p_this );
- vlc_mutex_lock( &p_priv->var_lock );
- i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
- if( i_var < 0 )
- {
- vlc_mutex_unlock( &p_priv->var_lock );
- return 0;
- }
- i_type = p_priv->p_vars[i_var].i_type;
- vlc_mutex_unlock( &p_priv->var_lock );
- return i_type;
- }
- int var_SetChecked( vlc_object_t *p_this, const char *psz_name,
- int expected_type, vlc_value_t val )
- {
- int i_var;
- variable_t *p_var;
- vlc_value_t oldval;
- vlc_object_internals_t *p_priv = vlc_internals( p_this );
- vlc_mutex_lock( &p_priv->var_lock );
- i_var = GetUnused( p_this, psz_name );
- if( i_var < 0 )
- {
- vlc_mutex_unlock( &p_priv->var_lock );
- return i_var;
- }
- p_var = &p_priv->p_vars[i_var];
- assert( (p_var->i_type & VLC_VAR_CLASS) == 0 || expected_type == 0 ||
- (p_var->i_type & VLC_VAR_CLASS) == expected_type );
- /* Duplicate data if needed */
- p_var->ops->pf_dup( &val );
- /* Backup needed stuff */
- oldval = p_var->val;
- /* Check boundaries and list */
- CheckValue( p_var, &val );
- /* Set the variable */
- p_var->val = val;
- /* Deal with callbacks. Tell we're in a callback, release the lock,
- * call stored functions, retake the lock. */
- if( p_var->i_entries )
- {
- int i_var;
- int i_entries = p_var->i_entries;
- callback_entry_t *p_entries = p_var->p_entries;
- p_var->b_incallback = true;
- vlc_mutex_unlock( &p_priv->var_lock );
- /* The real calls */
- for( ; i_entries-- ; )
- {
- p_entries[i_entries].pf_callback( p_this, psz_name, oldval, val,
- p_entries[i_entries].p_data );
- }
- vlc_mutex_lock( &p_priv->var_lock );
- i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
- if( i_var < 0 )
- {
- msg_Err( p_this, "variable %s has disappeared", psz_name );
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_ENOVAR;
- }
- p_var = &p_priv->p_vars[i_var];
- p_var->b_incallback = false;
- vlc_cond_broadcast( &p_priv->var_wait );
- }
- /* Free data if needed */
- p_var->ops->pf_free( &oldval );
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_SUCCESS;
- }
- /**
- * Set a variable's value
- *
- * param p_this The object that hold the variable
- * param psz_name The name of the variable
- * param val the value to set
- */
- int __var_Set( vlc_object_t *p_this, const char *psz_name, vlc_value_t val )
- {
- return var_SetChecked( p_this, psz_name, 0, val );
- }
- int var_GetChecked( vlc_object_t *p_this, const char *psz_name,
- int expected_type, vlc_value_t *p_val )
- {
- vlc_object_internals_t *p_priv = vlc_internals( p_this );
- int i_var, err = VLC_SUCCESS;
- vlc_mutex_lock( &p_priv->var_lock );
- i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
- if( i_var >= 0 )
- {
- variable_t *p_var = &p_priv->p_vars[i_var];
- assert( (p_var->i_type & VLC_VAR_CLASS) == 0 || expected_type == 0 ||
- (p_var->i_type & VLC_VAR_CLASS) == expected_type );
- /* Really get the variable */
- *p_val = p_var->val;
- /* Duplicate value if needed */
- p_var->ops->pf_dup( p_val );
- }
- else
- err = VLC_ENOVAR;
- vlc_mutex_unlock( &p_priv->var_lock );
- return err;
- }
- /**
- * Get a variable's value
- *
- * param p_this The object that holds the variable
- * param psz_name The name of the variable
- * param p_val Pointer to a vlc_value_t that will hold the variable's value
- * after the function is finished
- */
- int __var_Get( vlc_object_t *p_this, const char *psz_name, vlc_value_t *p_val )
- {
- return var_GetChecked( p_this, psz_name, 0, p_val );
- }
- /**
- * Register a callback in a variable
- *
- * We store a function pointer that will be called upon variable
- * modification.
- *
- * param p_this The object that holds the variable
- * param psz_name The name of the variable
- * param pf_callback The function pointer
- * param p_data A generic pointer that will be passed as the last
- * argument to the callback function.
- *
- * warning The callback function is run in the thread that calls var_Set on
- * the variable. Use proper locking. This thread may not have much
- * time to spare, so keep callback functions short.
- */
- int __var_AddCallback( vlc_object_t *p_this, const char *psz_name,
- vlc_callback_t pf_callback, void *p_data )
- {
- int i_var;
- variable_t *p_var;
- callback_entry_t entry;
- vlc_object_internals_t *p_priv = vlc_internals( p_this );
- entry.pf_callback = pf_callback;
- entry.p_data = p_data;
- vlc_mutex_lock( &p_priv->var_lock );
- i_var = GetUnused( p_this, psz_name );
- if( i_var < 0 )
- {
- vlc_mutex_unlock( &p_priv->var_lock );
- return i_var;
- }
- p_var = &p_priv->p_vars[i_var];
- INSERT_ELEM( p_var->p_entries,
- p_var->i_entries,
- p_var->i_entries,
- entry );
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_SUCCESS;
- }
- /**
- * Remove a callback from a variable
- *
- * pf_callback and p_data have to be given again, because different objects
- * might have registered the same callback function.
- */
- int __var_DelCallback( vlc_object_t *p_this, const char *psz_name,
- vlc_callback_t pf_callback, void *p_data )
- {
- int i_entry, i_var;
- variable_t *p_var;
- vlc_object_internals_t *p_priv = vlc_internals( p_this );
- vlc_mutex_lock( &p_priv->var_lock );
- i_var = GetUnused( p_this, psz_name );
- if( i_var < 0 )
- {
- vlc_mutex_unlock( &p_priv->var_lock );
- return i_var;
- }
- p_var = &p_priv->p_vars[i_var];
- for( i_entry = p_var->i_entries ; i_entry-- ; )
- {
- if( p_var->p_entries[i_entry].pf_callback == pf_callback
- && p_var->p_entries[i_entry].p_data == p_data )
- {
- break;
- }
- }
- if( i_entry < 0 )
- {
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_EGENERIC;
- }
- REMOVE_ELEM( p_var->p_entries, p_var->i_entries, i_entry );
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_SUCCESS;
- }
- /**
- * Trigger callback on a variable
- *
- * param p_this The object that hold the variable
- * param psz_name The name of the variable
- */
- int __var_TriggerCallback( vlc_object_t *p_this, const char *psz_name )
- {
- int i_var;
- variable_t *p_var;
- vlc_value_t oldval;
- vlc_object_internals_t *p_priv = vlc_internals( p_this );
- vlc_mutex_lock( &p_priv->var_lock );
- i_var = GetUnused( p_this, psz_name );
- if( i_var < 0 )
- {
- vlc_mutex_unlock( &p_priv->var_lock );
- return i_var;
- }
- p_var = &p_priv->p_vars[i_var];
- /* Backup needed stuff */
- oldval = p_var->val;
- /* Deal with callbacks. Tell we're in a callback, release the lock,
- * call stored functions, retake the lock. */
- if( p_var->i_entries )
- {
- int i_var;
- int i_entries = p_var->i_entries;
- callback_entry_t *p_entries = p_var->p_entries;
- p_var->b_incallback = true;
- vlc_mutex_unlock( &p_priv->var_lock );
- /* The real calls */
- for( ; i_entries-- ; )
- {
- p_entries[i_entries].pf_callback( p_this, psz_name, oldval, oldval,
- p_entries[i_entries].p_data );
- }
- vlc_mutex_lock( &p_priv->var_lock );
- i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
- if( i_var < 0 )
- {
- msg_Err( p_this, "variable %s has disappeared", psz_name );
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_ENOVAR;
- }
- p_var = &p_priv->p_vars[i_var];
- p_var->b_incallback = false;
- vlc_cond_broadcast( &p_priv->var_wait );
- }
- vlc_mutex_unlock( &p_priv->var_lock );
- return VLC_SUCCESS;
- }
- /** Parse a stringified option
- * This function parse a string option and create the associated object
- * variable
- * The option must be of the form "[no[-]]foo[=bar]" where foo is the
- * option name and bar is the value of the option.
- * param p_obj the object in which the variable must be created
- * param psz_option the option to parse
- * param trusted whether the option is set by a trusted input or not
- * return nothing
- */
- void var_OptionParse( vlc_object_t *p_obj, const char *psz_option,
- bool trusted )
- {
- char *psz_name, *psz_value;
- int i_type;
- bool b_isno = false;
- vlc_value_t val;
- val.psz_string = NULL;
- /* It's too much of a hassle to remove the ':' when we parse
- * the cmd line :) */
- if( psz_option[0] == ':' )
- psz_option++;
- if( !psz_option[0] )
- return;
- psz_name = strdup( psz_option );
- if( psz_name == NULL )
- return;
- psz_value = strchr( psz_name, '=' );
- if( psz_value != NULL )
- *psz_value++ = ' ';
- /* FIXME: :programs should be handled generically */
- if( !strcmp( psz_name, "programs" ) )
- i_type = VLC_VAR_LIST;
- else
- i_type = config_GetType( p_obj, psz_name );
- if( !i_type && !psz_value )
- {
- /* check for "no-foo" or "nofoo" */
- if( !strncmp( psz_name, "no-", 3 ) )
- {
- memmove( psz_name, psz_name + 3, strlen(psz_name) + 1 - 3 );
- }
- else if( !strncmp( psz_name, "no", 2 ) )
- {
- memmove( psz_name, psz_name + 2, strlen(psz_name) + 1 - 2 );
- }
- else goto cleanup; /* Option doesn't exist */
- b_isno = true;
- i_type = config_GetType( p_obj, psz_name );
- }
- if( !i_type ) goto cleanup; /* Option doesn't exist */
- if( ( i_type != VLC_VAR_BOOL ) &&
- ( !psz_value || !*psz_value ) ) goto cleanup; /* Invalid value */
- /* check if option is unsafe */
- if( !trusted )
- {
- module_config_t *p_config = config_FindConfig( p_obj, psz_name );
- if( !p_config || !p_config->b_safe )
- {
- msg_Err( p_obj, "unsafe option "%s" has been ignored for "
- "security reasons", psz_name );
- free( psz_name );
- return;
- }
- }
- /* Create the variable in the input object.
- * Children of the input object will be able to retreive this value
- * thanks to the inheritance property of the object variables. */
- var_Create( p_obj, psz_name, i_type );
- switch( i_type )
- {
- case VLC_VAR_BOOL:
- val.b_bool = !b_isno;
- break;
- case VLC_VAR_INTEGER:
- val.i_int = strtol( psz_value, NULL, 0 );
- break;
- case VLC_VAR_FLOAT:
- val.f_float = us_atof( psz_value );
- break;
- case VLC_VAR_STRING:
- case VLC_VAR_MODULE:
- case VLC_VAR_FILE:
- case VLC_VAR_DIRECTORY:
- val.psz_string = psz_value;
- break;
- case VLC_VAR_LIST:
- {
- char *psz_orig, *psz_var;
- vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
- val.p_list = p_list;
- p_list->i_count = 0;
- psz_var = psz_orig = strdup(psz_value);
- while( psz_var && *psz_var )
- {
- char *psz_item = psz_var;
- vlc_value_t val2;
- while( *psz_var && *psz_var != ',' ) psz_var++;
- if( *psz_var == ',' )
- {
- *psz_var = ' ';
- psz_var++;
- }
- val2.i_int = strtol( psz_item, NULL, 0 );
- INSERT_ELEM( p_list->p_values, p_list->i_count,
- p_list->i_count, val2 );
- /* p_list->i_count is incremented twice by INSERT_ELEM */
- p_list->i_count--;
- INSERT_ELEM( p_list->pi_types, p_list->i_count,
- p_list->i_count, VLC_VAR_INTEGER );
- }
- free( psz_orig );
- break;
- }
- default:
- goto cleanup;
- }
- var_Set( p_obj, psz_name, val );
- // If that's a list, remove all elements allocated
- if( i_type == VLC_VAR_LIST )
- FreeList( &val );
- cleanup:
- free( psz_name );
- }
- /* Following functions are local */
- /*****************************************************************************
- * GetUnused: find an unused (not in callback) variable from its name
- *****************************************************************************
- * We do i_tries tries before giving up, just in case the variable is being
- * modified and called from a callback.
- *****************************************************************************/
- static int GetUnused( vlc_object_t *p_this, const char *psz_name )
- {
- vlc_object_internals_t *p_priv = vlc_internals( p_this );
- while( true )
- {
- int i_var;
- i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
- if( i_var < 0 )
- {
- return VLC_ENOVAR;
- }
- if( ! p_priv->p_vars[i_var].b_incallback )
- {
- return i_var;
- }
- mutex_cleanup_push( &p_priv->var_lock );
- vlc_cond_wait( &p_priv->var_wait, &p_priv->var_lock );
- vlc_cleanup_pop( );
- }
- }
- /*****************************************************************************
- * HashString: our cool hash function
- *****************************************************************************
- * This function is not intended to be crypto-secure, we only want it to be
- * fast and not suck too much. This one is pretty fast and did 0 collisions
- * in wenglish's dictionary.
- *****************************************************************************/
- static uint32_t HashString( const char *psz_string )
- {
- uint32_t i_hash = 0;
- while( *psz_string )
- {
- i_hash += *psz_string++;
- i_hash += i_hash << 10;
- i_hash ^= i_hash >> 8;
- }
- return i_hash;
- }
- /*****************************************************************************
- * Insert: find an empty slot to insert a new variable
- *****************************************************************************
- * We use a recursive inner function indexed on the hash. This function does
- * nothing in the rare cases where a collision may occur, see Lookup()
- * to see how we handle them.
- * XXX: does this really need to be written recursively?
- *****************************************************************************/
- static int Insert( variable_t *p_vars, int i_count, const char *psz_name )
- {
- if( i_count == 0 )
- {
- return 0;
- }
- return InsertInner( p_vars, i_count, HashString( psz_name ) );
- }
- static int InsertInner( variable_t *p_vars, int i_count, uint32_t i_hash )
- {
- int i_middle;
- if( i_hash <= p_vars[0].i_hash )
- {
- return 0;
- }
- if( i_hash >= p_vars[i_count - 1].i_hash )
- {
- return i_count;
- }
- i_middle = i_count / 2;
- /* We know that 0 < i_middle */
- if( i_hash < p_vars[i_middle].i_hash )
- {
- return InsertInner( p_vars, i_middle, i_hash );
- }
- /* We know that i_middle + 1 < i_count */
- if( i_hash > p_vars[i_middle + 1].i_hash )
- {
- return i_middle + 1 + InsertInner( p_vars + i_middle + 1,
- i_count - i_middle - 1,
- i_hash );
- }
- return i_middle + 1;
- }
- static int u32cmp( const void *key, const void *data )
- {
- const variable_t *p_var = data;
- uint32_t hash = *(const uint32_t *)key ;
- if( hash > p_var->i_hash )
- return 1;
- if( hash < p_var->i_hash )
- return -1;
- return 0;
- }
- /*****************************************************************************
- * Lookup: find an existing variable given its name
- *****************************************************************************
- * We use a recursive inner function indexed on the hash. Care is taken of
- * possible hash collisions.
- *****************************************************************************/
- static int Lookup( variable_t *p_vars, size_t i_count, const char *psz_name )
- {
- variable_t *p_var;
- uint32_t i_hash;
- i_hash = HashString( psz_name );
- p_var = bsearch( &i_hash, p_vars, i_count, sizeof( *p_var ), u32cmp );
- /* Hash not found */
- if( p_var == NULL )
- return -1;
- assert( i_count > 0 );
- /* Find the first entry with the right hash */
- while( (p_var > p_vars) && (i_hash == p_var[-1].i_hash) )
- p_var--;
- assert( p_var->i_hash == i_hash );
- /* Hash collision should be very unlikely, but we cannot guarantee
- * it will never happen. So we do an exhaustive search amongst all
- * entries with the same hash. Typically, there is only one anyway. */
- for( variable_t *p_end = p_vars + i_count;
- (p_var < p_end) && (i_hash == p_var->i_hash);
- p_var++ )
- {
- if( !strcmp( psz_name, p_var->psz_name ) )
- return p_var - p_vars;
- }
- /* Hash found, but entry not found */
- return -1;
- }
- /*****************************************************************************
- * CheckValue: check that a value is valid wrt. a variable
- *****************************************************************************
- * This function checks p_val's value against p_var's limitations such as
- * minimal and maximal value, step, in-list position, and modifies p_val if
- * necessary.
- ****************************************************************************/
- static void CheckValue ( variable_t *p_var, vlc_value_t *p_val )
- {
- /* Check that our variable is in the list */
- if( p_var->i_type & VLC_VAR_HASCHOICE && p_var->choices.i_count )
- {
- int i;
- /* FIXME: the list is sorted, dude. Use something cleverer. */
- for( i = p_var->choices.i_count ; i-- ; )
- {
- if( p_var->ops->pf_cmp( *p_val, p_var->choices.p_values[i] ) == 0 )
- {
- break;
- }
- }
- /* If not found, change it to anything vaguely valid */
- if( i < 0 )
- {
- /* Free the old variable, get the new one, dup it */
- p_var->ops->pf_free( p_val );
- *p_val = p_var->choices.p_values[p_var->i_default >= 0
- ? p_var->i_default : 0 ];
- p_var->ops->pf_dup( p_val );
- }
- }
- /* Check that our variable is within the bounds */
- switch( p_var->i_type & VLC_VAR_TYPE )
- {
- case VLC_VAR_INTEGER:
- if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.i_int
- && (p_val->i_int % p_var->step.i_int) )
- {
- p_val->i_int = (p_val->i_int + (p_var->step.i_int / 2))
- / p_var->step.i_int * p_var->step.i_int;
- }
- if( p_var->i_type & VLC_VAR_HASMIN
- && p_val->i_int < p_var->min.i_int )
- {
- p_val->i_int = p_var->min.i_int;
- }
- if( p_var->i_type & VLC_VAR_HASMAX
- && p_val->i_int > p_var->max.i_int )
- {
- p_val->i_int = p_var->max.i_int;
- }
- break;
- case VLC_VAR_FLOAT:
- if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.f_float )
- {
- float f_round = p_var->step.f_float * (float)(int)( 0.5 +
- p_val->f_float / p_var->step.f_float );
- if( p_val->f_float != f_round )
- {
- p_val->f_float = f_round;
- }
- }
- if( p_var->i_type & VLC_VAR_HASMIN
- && p_val->f_float < p_var->min.f_float )
- {
- p_val->f_float = p_var->min.f_float;
- }
- if( p_var->i_type & VLC_VAR_HASMAX
- && p_val->f_float > p_var->max.f_float )
- {
- p_val->f_float = p_var->max.f_float;
- }
- break;
- case VLC_VAR_TIME:
- /* FIXME: TODO */
- break;
- }
- }
- /*****************************************************************************
- * InheritValue: try to inherit the value of this variable from the same one
- * in our closest parent, libvlc or ultimately from the configuration.
- * The function should always be entered with the object var_lock locked.
- *****************************************************************************/
- static int InheritValue( vlc_object_t *p_this, const char *psz_name,
- vlc_value_t *p_val, int i_type )
- {
- int i_var;
- variable_t *p_var;
- if( p_this->p_parent || ( p_this->p_libvlc && p_this != (vlc_object_t*) p_this->p_libvlc ) )
- {
- vlc_object_internals_t *p_priv;
- if( p_this->p_parent )
- p_priv = vlc_internals( p_this->p_parent );
- else
- p_priv = vlc_internals( p_this->p_libvlc );
- i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
- if( i_var >= 0 )
- {
- /* We found it! */
- p_var = &p_priv->p_vars[i_var];
- /* Really get the variable */
- *p_val = p_var->val;
- /* Duplicate value if needed */
- p_var->ops->pf_dup( p_val );
- /*msg_Dbg( p_this, "Inherited value for var %s from object %s",
- psz_name ? psz_name : "(null)",
- p_this->psz_object_name
- ? p_this->psz_object_name : "(Unknown)" );*/
- return VLC_SUCCESS;
- }
- else if ( p_this->p_parent ) /* We are still not there */
- return InheritValue( p_this->p_parent, psz_name, p_val, i_type );
- /* else take value from config */
- }
- switch( i_type & VLC_VAR_CLASS )
- {
- case VLC_VAR_STRING:
- p_val->psz_string = config_GetPsz( p_this, psz_name );
- if( !p_val->psz_string ) p_val->psz_string = strdup("");
- break;
- case VLC_VAR_FLOAT:
- p_val->f_float = config_GetFloat( p_this, psz_name );
- break;
- case VLC_VAR_INTEGER:
- p_val->i_int = config_GetInt( p_this, psz_name );
- break;
- case VLC_VAR_BOOL:
- p_val->b_bool = config_GetInt( p_this, psz_name );
- break;
- case VLC_VAR_LIST:
- {
- char *psz_orig, *psz_var;
- vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
- p_val->p_list = p_list;
- p_list->i_count = 0;
- psz_var = psz_orig = config_GetPsz( p_this, psz_name );
- while( psz_var && *psz_var )
- {
- char *psz_item = psz_var;
- vlc_value_t val;
- while( *psz_var && *psz_var != ',' ) psz_var++;
- if( *psz_var == ',' )
- {
- *psz_var = ' ';
- psz_var++;
- }
- val.i_int = strtol( psz_item, NULL, 0 );
- INSERT_ELEM( p_list->p_values, p_list->i_count,
- p_list->i_count, val );
- /* p_list->i_count is incremented twice by INSERT_ELEM */
- p_list->i_count--;
- INSERT_ELEM( p_list->pi_types, p_list->i_count,
- p_list->i_count, VLC_VAR_INTEGER );
- }
- free( psz_orig );
- break;
- }
- default:
- msg_Warn( p_this, "Could not inherit value for var %s "
- "from config. Invalid Type", psz_name );
- return VLC_ENOOBJ;
- break;
- }
- /*msg_Dbg( p_this, "Inherited value for var %s from config", psz_name );*/
- return VLC_SUCCESS;
- }
- /**********************************************************************
- * Execute a var command on an object identified by its name
- **********************************************************************/
- int __var_Command( vlc_object_t *p_this, const char *psz_name,
- const char *psz_cmd, const char *psz_arg, char **psz_msg )
- {
- vlc_object_t *p_obj = vlc_object_find_name( p_this->p_libvlc,
- psz_name, FIND_CHILD );
- int i_type, i_ret;
- if( !p_obj )
- {
- if( psz_msg )
- *psz_msg = strdup( "Unknown destination object." );
- return VLC_ENOOBJ;
- }
- i_type = var_Type( p_obj, psz_cmd );
- if( !( i_type&VLC_VAR_ISCOMMAND ) )
- {
- vlc_object_release( p_obj );
- if( psz_msg )
- *psz_msg = strdup( "Variable doesn't exist or isn't a command." );
- return VLC_EGENERIC;
- }
- i_type &= VLC_VAR_CLASS;
- switch( i_type )
- {
- case VLC_VAR_INTEGER:
- i_ret = var_SetInteger( p_obj, psz_cmd, atoi( psz_arg ) );
- break;
- case VLC_VAR_FLOAT:
- i_ret = var_SetFloat( p_obj, psz_cmd, us_atof( psz_arg ) );
- break;
- case VLC_VAR_STRING:
- i_ret = var_SetString( p_obj, psz_cmd, psz_arg );
- break;
- case VLC_VAR_BOOL:
- i_ret = var_SetBool( p_obj, psz_cmd, atoi( psz_arg ) );
- break;
- default:
- i_ret = VLC_EGENERIC;
- break;
- }
- vlc_object_release( p_obj );
- if( psz_msg )
- {
- if( asprintf( psz_msg, "%s on object %s returned %i (%s)",
- psz_cmd, psz_name, i_ret, vlc_error( i_ret ) ) == -1)
- *psz_msg = NULL;
- }
- return i_ret;
- }