libvlc.dll之C#接口

/*****************************************************************************
* NativeLibVlc.cs: NativeLibVlc class definition
*****************************************************************************
* Copyright (C) 2006 Chris Meadowcroft
*
* Authors: Chris Meadowcroft
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation.
*
* 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 Lesser 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.
*****************************************************************************/

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;

namespace VLanControl
{
internal enum ObjectType : int
{
VLC_OBJECT_ROOT = (-1),
VLC_OBJECT_VLC = (-2),
VLC_OBJECT_MODULE = (-3),
VLC_OBJECT_INTF = (-4),
VLC_OBJECT_PLAYLIST = (-5),
VLC_OBJECT_ITEM = (-6),
VLC_OBJECT_INPUT = (-7),
VLC_OBJECT_DECODER = (-8),
VLC_OBJECT_VOUT = (-9),
VLC_OBJECT_AOUT = (-10),
VLC_OBJECT_SOUT = (-11),
VLC_OBJECT_HTTPD = (-12),
VLC_OBJECT_PACKETIZER = (-13),
VLC_OBJECT_ENCODER = (-14),
VLC_OBJECT_DIALOGS = (-15),
VLC_OBJECT_VLM = (-16),
VLC_OBJECT_ANNOUNCE = (-17),
VLC_OBJECT_DEMUX = (-18),
VLC_OBJECT_ACCESS = (-19),
VLC_OBJECT_STREAM = (-20),
VLC_OBJECT_OPENGL = (-21),
VLC_OBJECT_FILTER = (-22),
VLC_OBJECT_VOD = (-23),
VLC_OBJECT_SPU = (-24),
VLC_OBJECT_TLS = (-25),
VLC_OBJECT_SD = (-26),
VLC_OBJECT_XML = (-27),
VLC_OBJECT_OSDMENU = (-28),
VLC_OBJECT_STATS = (-29),
VLC_OBJECT_HTTPD_HOST = (-30),

VLC_OBJECT_GENERIC = (-666),
}

internal enum VlcError : int
{
Success = -0,
NoMem = -1,
Thread = -2,
Timeout = -3,

NoMod = -10,

NoObj = -20,
BadObj = -21,

NoVar = -30,
BadVar = -31,

Exit = -255,
Generic = -666,

Exception = -998,
NoInit = -999,
};

internal enum InputState : int
{
INIT_S = 0,
OPENING_S = 1,
BUFFERING_S = 2,
PLAYING_S = 3,
PAUSE_S = 4,
END_S = 5,
ERROR_S = 6,
}

internal class NativeLibVlc : IDisposable
{
#region private vlc enums

enum Mode : int
{
Insert = 0x01,
Replace = 0x02,
Append = 0x04,
Go = 0x08,
CheckInsert = 0x10
};

public const Int32 EndOfPlaylist = -666;

[Flags]
enum ObjectSearchMode : int
{
FIND_PARENT = 0x0001,
FIND_CHILD = 0x0002,
FIND_ANYWHERE = 0x0003,
FIND_STRICT = 0x0010,
}

[Flags]
enum VarFlags : int
{
/** /defgroup var_flags Additive flags
* These flags are added to the type field of the variable. Most as a result of
* a __var_Change() call, but some may be added at creation time
* @{
*/
VLC_VAR_HASCHOICE = 0x0100,
VLC_VAR_HASMIN = 0x0200,
VLC_VAR_HASMAX = 0x0400,
VLC_VAR_HASSTEP = 0x0800,

VLC_VAR_ISLIST = 0x1000,
VLC_VAR_ISCOMMAND = 0x2000,
VLC_VAR_ISCONFIG = 0x2000,

/** Creation flag */
VLC_VAR_DOINHERIT = 0x8000,

/**
* /defgroup var_action Variable actions
* These are the different actions that can be used with __var_Change().
* The parameters given are the meaning of the two last parameters of
* __var_Change() when this action is being used.
* @{
*/

/**
* Set the minimum value of this variable
* /param p_val The new minimum value
* /param p_val2 Unused
*/
VLC_VAR_SETMIN = 0x0010,
/**
* Set the maximum value of this variable
* /param p_val The new maximum value
* /param p_val2 Unused
*/
VLC_VAR_SETMAX = 0x0011,
VLC_VAR_SETSTEP = 0x0012,
/**
* Set the value of this variable without triggering any callbacks
* /param p_val The new value
* /param p_val2 Unused
*/
VLC_VAR_SETVALUE = 0x0013,

VLC_VAR_SETTEXT = 0x0014,
VLC_VAR_GETTEXT = 0x0015,

VLC_VAR_ADDCHOICE = 0x0020,
VLC_VAR_DELCHOICE = 0x0021,
VLC_VAR_CLEARCHOICES = 0x0022,
VLC_VAR_SETDEFAULT = 0x0023,
VLC_VAR_GETCHOICES = 0x0024,
VLC_VAR_FREECHOICES = 0x0025,
VLC_VAR_GETLIST = 0x0026,
VLC_VAR_FREELIST = 0x0027,
VLC_VAR_CHOICESCOUNT = 0x0028,

VLC_VAR_INHERITVALUE = 0x0030,
VLC_VAR_TRIGGER_CALLBACKS = 0x0035,
}

enum playlist_command : int
{
PLAYLIST_PLAY = 0, /**< No arg. res=can fail*/
PLAYLIST_AUTOPLAY = 1, /**< No arg. res=cant fail*/
PLAYLIST_VIEWPLAY = 2, /**< arg1= int, arg2= playlist_item_t*,*/
/** arg3 = playlist_item_t* , res=can fail */
PLAYLIST_ITEMPLAY = 3, /** <arg1 = playlist_item_t * , res=can fail */
PLAYLIST_PAUSE = 4, /**< No arg res=can fail*/
PLAYLIST_STOP = 5, /**< No arg res=can fail*/
PLAYLIST_SKIP = 6, /**< arg1=int, res=can fail*/
PLAYLIST_GOTO = 7, /**< arg1=int res=can fail */
PLAYLIST_VIEWGOTO = 8 /**< arg1=int res=can fail */
}

enum CONFIG_ITEM : int
{
CONFIG_ITEM_STRING = 0x0010,
CONFIG_ITEM_FILE = 0x0020,
CONFIG_ITEM_MODULE = 0x0030,
CONFIG_ITEM_INTEGER = 0x0040,
CONFIG_ITEM_BOOL = 0x0050,
CONFIG_ITEM_FLOAT = 0x0060,
}

enum input_query_e : int
{
/* input variable "position" */
INPUT_GET_POSITION = 0, /* arg1= double * res= */
INPUT_SET_POSITION, /* arg1= double res=can fail */

/* input variable "length" */
INPUT_GET_LENGTH, /* arg1= int64_t * res=can fail */

/* input variable "time" */
INPUT_GET_TIME, /* arg1= int64_t * res= */
INPUT_SET_TIME, /* arg1= int64_t res=can fail */

/* input variable "rate" (1 is DEFAULT_RATE) */
INPUT_GET_RATE, /* arg1= int * res= */
INPUT_SET_RATE, /* arg1= int res=can fail */

/* input variable "state" */
INPUT_GET_STATE, /* arg1= int * res= */
INPUT_SET_STATE, /* arg1= int res=can fail */

/* input variable "audio-delay" and "sub-delay" */
INPUT_GET_AUDIO_DELAY, /* arg1 = int* res=can fail */
INPUT_SET_AUDIO_DELAY, /* arg1 = int res=can fail */
INPUT_GET_SPU_DELAY, /* arg1 = int* res=can fail */
INPUT_SET_SPU_DELAY, /* arg1 = int res=can fail */

/* Meta datas */
INPUT_ADD_INFO, /* arg1= char* arg2= char* arg3=... res=can fail */
INPUT_GET_INFO, /* arg1= char* arg2= char* arg3= char** res=can fail */
INPUT_DEL_INFO, /* arg1= char* arg2= char* res=can fail */
INPUT_SET_NAME, /* arg1= char* res=can fail */

/* Input config options */
INPUT_ADD_OPTION, /* arg1= char * arg2= char * res=can fail*/

/* Input properties */
INPUT_GET_BYTE_POSITION, /* arg1= int64_t * res= */
INPUT_SET_BYTE_SIZE, /* arg1= int64_t * res= */

/* bookmarks */
INPUT_GET_BOOKMARKS, /* arg1= seekpoint_t *** arg2= int * res=can fail */
INPUT_CLEAR_BOOKMARKS, /* res=can fail */
INPUT_ADD_BOOKMARK, /* arg1= seekpoint_t * res=can fail */
INPUT_CHANGE_BOOKMARK, /* arg1= seekpoint_t * arg2= int * res=can fail */
INPUT_DEL_BOOKMARK, /* arg1= seekpoint_t * res=can fail */
INPUT_SET_BOOKMARK, /* arg1= int res=can fail */

/* On the fly input slave */
INPUT_ADD_SLAVE /* arg1= char * */
}

#endregion

#region private vlc structs
[StructLayout(LayoutKind.Sequential)]
struct libvlc_exception_t
{
public Int32 b_raised;
public IntPtr psz_message;

public void Init()
{
libvlc_exception_init(out this);
}

public bool WasExceptionRaised()
{
if(0 != libvlc_exception_raised(ref this))
{
libvlc_exception_clear(ref this);
return true;
}
return false;
}
}

[StructLayout(LayoutKind.Sequential)]
struct libvlc_instance_t
{
public IntPtr p_vlc;
public IntPtr p_playlist;
public IntPtr p_vlm;
public Int32 i_vlc_id;

public libvlc_instance_t(IntPtr vlc, IntPtr playlist, int vlcHandle)
{
this.p_vlc = vlc;
this.p_playlist = playlist;
this.p_vlm = IntPtr.Zero;
this.i_vlc_id = vlcHandle;
}
}

[StructLayout(LayoutKind.Sequential)]
struct vlc_list_t
{
public Int32 i
13db9
_count;
public IntPtr p_values;
public IntPtr pi_types;
}

[StructLayout( LayoutKind.Explicit )]
struct vlc_value_t
{
[FieldOffset( 0 )] public Int32 i_int;
[FieldOffset( 0 )] public Int32 b_bool;
[FieldOffset( 0 )][MarshalAs(UnmanagedType.R4)] public float f_float;
[FieldOffset( 0 )] public IntPtr psz_string;
[FieldOffset( 0 )] public IntPtr p_address;
[FieldOffset( 0 )] public IntPtr p_object;
[FieldOffset( 0 )] public IntPtr p_list;
[FieldOffset( 0 )][MarshalAs(UnmanagedType.I8)] public Int64 i_time;

[FieldOffset( 0 )] public IntPtr psz_name;
[FieldOffset( 4 )] public Int32 i_object_id;
}

[StructLayout(LayoutKind.Sequential)]
struct module_config_t
{
public CONFIG_ITEM i_type;
}

#endregion

#region vlc api interop
const int AOUT_VOLUME_MAX = 1024;
const int VOLUME_MAX = 200;
const int DEFAULT_CHAN = 1;
const String Playlist_Current = "item-change";
const String Now_Playing = "Now Playing";
const String Meta_information = "Meta-information";
const String Meta_title = "meta-title";
const String Meta_author = "meta-author";
const String Meta_artist = "meta-artist";
const String Meta_genre = "meta-genre";
const String Meta_description = "meta-description";
const String Meta_url = "meta-url";

[DllImport("libvlc")]
static extern int VLC_Create();
[DllImport("libvlc")]
static extern VlcError VLC_Init(int iVLC, int Argc, [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPStr)]string[] Argv);
[DllImport("libvlc")]
static extern string VLC_Version();
[DllImport("libvlc")]
static extern VlcError VLC_CleanUp(int iVLC);
[DllImport("libvlc")]
static extern VlcError VLC_Destroy(int iVLC);
[DllImport("libvlc")]
static extern string VLC_Error(int i_err);

[DllImport("libvlc")]
static extern IntPtr vlc_current_object(int i_object);
[DllImport("libvlc")]
static extern IntPtr __vlc_object_find(IntPtr p_vlc, ObjectType objectType, ObjectSearchMode mode);
[DllImport("libvlc")]
static extern void __vlc_object_release(IntPtr p_vlc);
[DllImport("libvlc")]
static extern VlcError __var_Set(IntPtr p_vlc, String name, vlc_value_t value);
[DllImport("libvlc")]
static extern VlcError __var_Get(IntPtr p_this, String name, ref vlc_value_t value);
[DllImport("libvlc")]
static extern VlcError __var_Change(IntPtr p_this, String name, VarFlags varFlags,
ref vlc_value_t value, ref vlc_value_t value2);

[DllImport("libvlc")]
static extern VlcError __aout_VolumeGet(IntPtr p_vlc, ref Int16 volume);
[DllImport("libvlc")]
static extern VlcError __aout_VolumeSet(IntPtr p_vlc, Int16 volume);
[DllImport("libvlc")]
static extern VlcError __aout_VolumeMute(IntPtr p_vlc, IntPtr alwaysNull);

[DllImport("libvlc")]
static extern void libvlc_exception_init(out libvlc_exception_t p_exception);
[DllImport("libvlc")]
static extern Int32 libvlc_exception_raised(ref libvlc_exception_t p_exception);
[DllImport("libvlc")]
static extern void libvlc_exception_clear(ref libvlc_exception_t p_exception);

[DllImport("libvlc")]
static extern void libvlc_playlist_play(ref libvlc_instance_t libvlc, Int32 id,
Int32 optionsCount, IntPtr optionsAlwaysNull, ref libvlc_exception_t p_exception);
[DllImport("libvlc")]
static extern IntPtr libvlc_playlist_get_input(ref libvlc_instance_t libvlc, ref libvlc_exception_t p_exception);

[DllImport("libvlc")]
static extern int VLC_PlaylistIndex(int vlcObject);
[DllImport("libvlc")]
static extern int VLC_PlaylistNumberOfItems(int vlcObject);

[DllImport("libvlc")]
static extern void libvlc_input_free(IntPtr p_input);

[DllImport("libvlc")]
static extern int libvlc_video_get_width(IntPtr p_input, ref libvlc_exception_t p_exception);
[DllImport("libvlc")]
static extern int libvlc_video_get_height(IntPtr p_input, ref libvlc_exception_t p_exception);

[DllImport("libvlc", CallingConvention=CallingConvention.Cdecl)]
static extern VlcError playlist_LockControl(IntPtr p_playlist, playlist_command i_query);
[DllImport("libvlc", CallingConvention = CallingConvention.Cdecl)]
static extern VlcError playlist_LockControl(IntPtr p_playlist, playlist_command i_query, Int32 arg1);
[DllImport("libvlc")]
static extern VlcError playlist_Clear(IntPtr p_playlist);
[DllImport("libvlc")]
static extern VlcError playlist_AddExt(IntPtr p_playlist, String mrl, String mrlDuplicate,
Mode mode, Int32 pos, Int64 mtime_t,
[MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPStr)]string[] Options,
int OptionsCount);

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
delegate int VarChangedCallback(IntPtr vlc, String variable, vlc_value_t old_val,
vlc_value_t new_val, IntPtr param);

[DllImport("libvlc")]
static extern int __var_AddCallback(IntPtr vlc, String variable, VarChangedCallback cb,
IntPtr param);
[DllImport("libvlc")]
static extern int __var_DelCallback(IntPtr vlc, String variable, VarChangedCallback cb,
IntPtr param);
[DllImport("libvlc", CallingConvention = CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
static extern VlcError input_Control(IntPtr input_thread_t, input_query_e i_query, String category, String name,
ref IntPtr result);

[DllImport("libvlc", CallingConvention = CallingConvention.Cdecl)]
static extern void __vout_OSDMessage(IntPtr p_input, int i_channel, String message);
[DllImport("libvlc")]
static extern IntPtr config_FindConfig(IntPtr vlc, String name);
[DllImport("libvlc")]
static extern void __config_PutInt(IntPtr vlc, String name, int value);
[DllImport("libvlc")]
static extern void __config_PutFloat(IntPtr vlc, String name, float value);
[DllImport("libvlc")]
static extern void __config_PutPsz(IntPtr vlc, String name, String value);

[DllImport("libvlc")]
static extern int __config_GetInt(IntPtr vlc, String name);
[DllImport("libvlc")]
static extern float __config_GetFloat(IntPtr vlc, String name);
[DllImport("libvlc")]
static extern String __config_GetPsz(IntPtr vlc, String name);

#endregion

static NativeLibVlc()
{
NativeLibVlc.vlcInstallDirectory = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase).Substring(6);
//NativeLibVlc.vlcInstallDirectory = Environment.CurrentDirectory;
//NativeLibVlc.vlcInstallDirectory = QueryVlcInstallPath();
}

public NativeLibVlc()
{
}

#region IDisposable
public void Dispose()
{
if(vlcHandle != -1)
{
try
{
if(this.gch.IsAllocated)
{
UnhookPlaylistChanges();
}
VideoOutput = null;
VLC_CleanUp(this.vlcHandle);
VLC_Destroy(this.vlcHandle);
}
catch { }
}
vlcHandle = -1;
}
#endregion

#region internal Vlc interop helper classes
internal class VlcObject : IDisposable
{
IntPtr vlc = IntPtr.Zero;
IntPtr subObject = IntPtr.Zero;
bool isDisposed;

public VlcObject(int vlcHandle, ObjectType objectType)
{
vlc = vlc_current_object(vlcHandle);
if(IntPtr.Zero != vlc)
{
if(objectType == ObjectType.VLC_OBJECT_VLC)
{
subObject = vlc;
}
else
{
subObject = __vlc_object_find(vlc, objectType, ObjectSearchMode.FIND_CHILD);
}
}
}

public IntPtr Vlc { get { return this.vlc; } }
public IntPtr SubObject { get { return this.subObject; } }

public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}

protected virtual void Dispose(bool disposing)
{
if(!this.isDisposed)
{
this.isDisposed = true;
if((IntPtr.Zero != subObject) && (subObject != vlc))
{
__vlc_object_release(subObject);
}
if(IntPtr.Zero != vlc)
{
__vlc_object_release(vlc);
}
}
}

protected bool IsDisposed { get { return this.isDisposed; } }

~VlcObject()
{
Dispose(false);
}
}

private class VlcPlaylistObject : VlcObject
{
public libvlc_instance_t libvlc;
public libvlc_exception_t exception;

public VlcPlaylistObject(int vlcHandle)
: base(vlcHandle, ObjectType.VLC_OBJECT_PLAYLIST)
{
if(this.SubObject != IntPtr.Zero)
{
this.libvlc = new libvlc_instance_t(this.Vlc, this.SubObject, vlcHandle);
this.exception.Init();
}
}
}
#endregion

#region public Vlc interop helper functions
public VlcObject OpenVlcObject(ObjectType objectType)
{
return new VlcObject(this.vlcHandle, objectType);
}

public int GetVlcObjectInt(ObjectType objectType, String propertyName, int errorReturn)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, objectType))
{
vlc_value_t intValue = new vlc_value_t();
if((vobj.SubObject != IntPtr.Zero) &&
(VlcError.Success == __var_Get(vobj.SubObject, propertyName, ref intValue)))
{
return intValue.i_int;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}
return errorReturn;
}

public VlcError SetVlcObjectInt(ObjectType objectType, String propertyName, int value)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, objectType))
{
if(vobj.SubObject != IntPtr.Zero)
{
vlc_value_t intValue = new vlc_value_t();
intValue.i_int = value;
return __var_Set(vobj.SubObject, propertyName, intValue);
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}
return VlcError.NoObj;
}

public long GetVlcObjectLong(ObjectType objectType, String propertyName, long errorReturn)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, objectType))
{
vlc_value_t longValue = new vlc_value_t();
if((vobj.SubObject != IntPtr.Zero) &&
(VlcError.Success == __var_Get(vobj.SubObject, propertyName, ref longValue)))
{
return longValue.i_time;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}
return errorReturn;
}

public VlcError SetVlcObjectLong(ObjectType objectType, String propertyName, long value)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, objectType))
{
if(vobj.SubObject != IntPtr.Zero)
{
vlc_value_t longValue = new vlc_value_t();
longValue.i_time = value;
return __var_Set(vobj.SubObject, propertyName, longValue);
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}
return VlcError.NoObj;
}

public float GetVlcObjectFloat(ObjectType objectType, String propertyName, float errorReturn)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, objectType))
{
vlc_value_t floatValue = new vlc_value_t();
if((vobj.SubObject != IntPtr.Zero) &&
(VlcError.Success == __var_Get(vobj.SubObject, propertyName, ref floatValue)))
{
return floatValue.f_float;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}
return errorReturn;
}

public VlcError SetVlcObjectFloat(ObjectType objectType, String propertyName, float value)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, objectType))
{
if(vobj.SubObject != IntPtr.Zero)
{
vlc_value_t floatValue = new vlc_value_t();
floatValue.f_float = value;
return __var_Set(vobj.SubObject, propertyName, floatValue);
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}
return VlcError.NoObj;
}

public String GetVlcObjectString(ObjectType objectType, String propertyName, String errorReturn)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, objectType))
{
vlc_value_t stringValue = new vlc_value_t();
if((vobj.SubObject != IntPtr.Zero) &&
(VlcError.Success == __var_Get(vobj.SubObject, propertyName, ref stringValue)))
{
return Marshal.PtrToStringAnsi(stringValue.psz_string);
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}
return errorReturn;
}

public VlcError SetVlcObjectString(ObjectType objectType, String propertyName, String value)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, objectType))
{
if(vobj.SubObject != IntPtr.Zero)
{
vlc_value_t stringValue = new vlc_value_t();
IntPtr valuePtr = Marshal.StringToCoTaskMemAnsi(value);
stringValue.psz_string = valuePtr;
VlcError ret = __var_Set(vobj.SubObject, propertyName, stringValue);
Marshal.ZeroFreeCoTaskMemAnsi(valuePtr);
return ret;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}
return VlcError.NoObj;
}

public VlcError GetVlcVariableChoiceList(ObjectType objectType, String propertyName,
out int[] choiceIds, out String[] choiceText)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, objectType))
{
if(vobj.SubObject != IntPtr.Zero)
{
vlc_value_t idValues = new vlc_value_t();
vlc_value_t textValues = new vlc_value_t();
if(VlcError.Success == __var_Change(vobj.SubObject, propertyName,
VarFlags.VLC_VAR_GETLIST, ref idValues, ref textValues))
{
try
{
vlc_list_t idList = (vlc_list_t)Marshal.PtrToStructure(
idValues.p_list, typeof(vlc_list_t));
vlc_list_t textList = (vlc_list_t)Marshal.PtrToStructure(
textValues.p_list, typeof(vlc_list_t));

int choiceCount = idList.i_count;
choiceIds = new Int32[choiceCount];
choiceText = new String[choiceCount];

for(int index = 0; index < choiceCount; index++)
{
IntPtr idPtr = new IntPtr(idList.p_values.ToInt32() +
index * Marshal.SizeOf(typeof(vlc_value_t)));
vlc_value_t idValue = (vlc_value_t)Marshal.PtrToStructure(
idPtr, typeof(vlc_value_t));
choiceIds[index] = idValue.i_int;

IntPtr textPtr = new IntPtr(textList.p_values.ToInt32() +
index * Marshal.SizeOf(typeof(vlc_value_t)));
vlc_value_t textValue = (vlc_value_t)Marshal.PtrToStructure(
textPtr, typeof(vlc_value_t));
choiceText[index] = Marshal.PtrToStringAnsi(textValue.psz_string);
}
return VlcError.Success;
}
finally
{
__var_Change(vobj.SubObject, propertyName, VarFlags.VLC_VAR_FREELIST,
ref idValues, ref textValues);
}
}
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}

choiceIds = new int[0];
choiceText = new string[0];
return VlcError.NoObj;
}

public VlcError GetVlcVariableChoiceList(ObjectType objectType, String propertyName,
out String[] choices, out String[] choiceText)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, objectType))
{
if(vobj.SubObject != IntPtr.Zero)
{
vlc_value_t idValues = new vlc_value_t();
vlc_value_t textValues = new vlc_value_t();
if(VlcError.Success == __var_Change(vobj.SubObject, propertyName,
VarFlags.VLC_VAR_GETLIST, ref idValues, ref textValues))
{
try
{
vlc_list_t idList = (vlc_list_t)Marshal.PtrToStructure(
idValues.p_list, typeof(vlc_list_t));
vlc_list_t textList = (vlc_list_t)Marshal.PtrToStructure(
textValues.p_list, typeof(vlc_list_t));

int choiceCount = idList.i_count;
List<String> choiceList = new List<string>(choiceCount);
List<String> choiceTextList = new List<string>(choiceCount);
Dictionary<String, int> choiceDict = new Dictionary<string, int>(choiceCount);
for(int index = 0; index < choiceCount; index++)
{
IntPtr idPtr = new IntPtr(idList.p_values.ToInt32() +
index * Marshal.SizeOf(typeof(vlc_value_t)));
vlc_value_t idValue = (vlc_value_t)Marshal.PtrToStructure(
idPtr, typeof(vlc_value_t));
String choice = Marshal.PtrToStringAnsi(idValue.psz_name);
choiceList.Add(choice);
if(choiceDict.ContainsKey(choice))
{
choiceDict[choice] = choiceDict[choice] + 1;
}
else
{
choiceDict[choice] = 1;
}

IntPtr textPtr = new IntPtr(textList.p_values.ToInt32() +
index * Marshal.SizeOf(typeof(vlc_value_t)));
vlc_value_t textValue = (vlc_value_t)Marshal.PtrToStructure(
textPtr, typeof(vlc_value_t));
choiceTextList.Add(Marshal.PtrToStringAnsi(textValue.psz_string));
}

int listIndex = 0;
for(int index = 0; index < choiceCount; index++)
{
String choice = choiceList[listIndex];
if((choiceDict[choice] > 1) && (choiceTextList[listIndex] == null))
{
choiceList.RemoveAt(listIndex);
choiceTextList.RemoveAt(listIndex);
choiceDict[choice] = choiceDict[choice] - 1;
}
else
{
listIndex++;
}
}
for(int index = 0; index < choiceList.Count; index++)
{
if(choiceTextList[index] == null)
{
choiceTextList[index] = choiceList[index];
}
}

choices = choiceList.ToArray();
choiceText = choiceTextList.ToArray();
return VlcError.Success;
}
finally
{
__var_Change(vobj.SubObject, propertyName, VarFlags.VLC_VAR_FREELIST,
ref idValues, ref textValues);
}
}
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}

choices = new string[0];
choiceText = new string[0];
return VlcError.NoObj;
}
#endregion

#region public Properties
public static string VlcInstallDir
{
get{ return vlcInstallDirectory; }
set{ vlcInstallDirectory = value; }
}

public bool IsInitialized
{
get{return (vlcHandle != -1);}
}

public Control VideoOutput
{
get { return outputWindow; }
set
{
if(value == null)
{
if(outputWindow != null)
{
outputWindow = null;
if(vlcHandle != -1)
{
SetVlcObjectInt(ObjectType.VLC_OBJECT_VLC, "drawable", 0);
}
}
}
else
{
outputWindow = value;
if(vlcHandle != -1)
{
SetVlcObjectInt(ObjectType.VLC_OBJECT_VLC, "drawable", outputWindow.Handle.ToInt32());
}
}
}
}

public string LastError
{
get{return lastErrorMessage;}
}

public event MetaDataEventHandler NowPlaying;

protected virtual void OnNowPlaying(MetaDataUpdateEventArgs args)
{
if(this.NowPlaying != null)
{
this.NowPlaying(this, args);
}
}

protected delegate void HandleNowPlaying(MetaDataUpdateEventArgs args);

protected virtual void VlcNowPlayingChanged(String newText)
{
// switch out of the Vlc thread to our User Interface thread if possible
if(this.VideoOutput != null)
{
this.VideoOutput.BeginInvoke(new HandleNowPlaying(OnNowPlaying),
new MetaDataUpdateEventArgs(MetaData.NowPlaying, newText));
}
else
{
OnNowPlaying(new MetaDataUpdateEventArgs(MetaData.NowPlaying, newText));
}
}

public int Length
{
get
{
if(this.artificialLength != 0)
{
return this.artificialLength;
}
else
{
return Convert.ToInt32(GetVlcObjectLong(ObjectType.VLC_OBJECT_INPUT, "length", 0) / 1000000L);
}
}
}

public void SetArtificialLength(int newLength)
{
this.artificialLength = newLength;
}

public int Time
{
get
{
int time = Convert.ToInt32(GetVlcObjectLong(ObjectType.VLC_OBJECT_INPUT, "time", 0) / 1000000L);
if((time == 0) && (this.artificialLength != 0))
{
time = Convert.ToInt32(Position * this.artificialLength + .5d);
}
if(this.timeScaling != 0.0d)
{
time = Convert.ToInt32(time / this.timeScaling);
}
return time;
}
set
{
if(this.artificialLength != 0)
{
float position = Convert.ToSingle(value) / Convert.ToSingle(this.artificialLength);
if(this.timeScaling != 0.0d)
{
position = Convert.ToSingle(position * this.timeScaling);
}
Debug.WriteLine(String.Format("Set Position {0}", position));
SetVlcObjectFloat(ObjectType.VLC_OBJECT_INPUT, "position", position);
}
else
{
long time = Convert.ToInt64(value) * 1000000L;
if(this.timeScaling != 0.0d)
{
time = Convert.ToInt64(time * this.timeScaling);
}
Debug.WriteLine(String.Format("Set Time {0}", time));
SetVlcObjectLong(ObjectType.VLC_OBJECT_INPUT, "time", time);
}
}
}

public double TimeScaling
{
get { return this.timeScaling; }
set { this.timeScaling = value; }
}

public double Position
{
get
{
double position = GetVlcObjectFloat(ObjectType.VLC_OBJECT_INPUT, "position", 0.0f);
if(this.timeScaling != 0.0d)
{
position = position / this.timeScaling;
}
return position;
}
set
{
double position = value;
if(this.timeScaling != 0.0d)
{
position = position * this.timeScaling;
}
Debug.WriteLine(String.Format("Set Position {0}", position));
SetVlcObjectFloat(ObjectType.VLC_OBJECT_INPUT, "position", Convert.ToSingle(position));
}
}

public int Volume
{
get
{
IntPtr vlc = vlc_current_object(vlcHandle);
if(IntPtr.Zero != vlc)
{
try
{
Int16 aoutVol = 0;
if(__aout_VolumeGet(vlc, ref aoutVol) == VlcError.Success)
{
return (aoutVol * VOLUME_MAX + AOUT_VOLUME_MAX / 2) / AOUT_VOLUME_MAX;
}
}
catch(Exception)
{
}
finally
{
__vlc_object_release(vlc);
}
}
return 0;
}
set
{
IntPtr vlc = vlc_current_object(vlcHandle);
if(IntPtr.Zero != vlc)
{
try
{
Int16 aoutVol = Convert.ToInt16((value * AOUT_VOLUME_MAX + VOLUME_MAX / 2) / VOLUME_MAX);
__aout_VolumeSet(vlc, aoutVol);
}
catch(Exception)
{
}
finally
{
__vlc_object_release(vlc);
}
}
}
}

public bool Fullscreen
{
get
{
int isFullScreen = GetVlcObjectInt(ObjectType.VLC_OBJECT_VLC, "fullscreen", -666);
if((isFullScreen != -666) && (isFullScreen != 0))
{
return true;
}
return false;

}
set
{
SetVlcObjectInt(ObjectType.VLC_OBJECT_VLC, "fullscreen", value ? 1 : 0);
}
}

public int PlaylistIndex
{
get
{
try
{
return VLC_PlaylistIndex(this.vlcHandle);
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
return -1;
}
}
}

public int PlaylistCount
{
get
{
try
{
return VLC_PlaylistNumberOfItems(this.vlcHandle);
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
return -1;
}
}
}

#endregion

#region public Methods
public bool Initialize()
{
// check if already initializes
if(vlcHandle != -1)
return true;

string oldDir = Environment.CurrentDirectory;
// try init
try
{
// create instance
Environment.CurrentDirectory = NativeLibVlc.vlcInstallDirectory;
this.vlcHandle = VLC_Create();

if(this.vlcHandle < 0)
{
lastErrorMessage = "Failed to create VLC instance";
return false;
}

string[] initOptions = { NativeLibVlc.vlcInstallDirectory,
":no-one-instance",
":no-loop",
":no-drop-late-frames",
":disable-screensaver",
":vout=vout_directx",
"--plugin-path=" + NativeLibVlc.vlcInstallDirectory + @"/plugins",
};

// init libvlc
VlcError errVlcLib = VLC_Init(vlcHandle, initOptions.Length, initOptions);
if(errVlcLib != VlcError.Success)
{
VLC_Destroy(vlcHandle);
lastErrorMessage = "Failed to initialise VLC";
this.vlcHandle = -1;
return false;
}
}
catch
{
lastErrorMessage = "Could not find libvlc";
return false;
}
finally
{
Environment.CurrentDirectory = oldDir;
}

// check output window
if(outputWindow != null)
{
SetVlcObjectInt(ObjectType.VLC_OBJECT_VLC, "drawable", outputWindow.Handle.ToInt32());
}

return true;
}

// there's an overhead to supporting Vlc events, a memory leak, so we need to have them off by default
public bool ProducingEvents
{
get { return this.gch.IsAllocated; }
set
{
if(value)
{
if(!this.gch.IsAllocated)
{
HookPlaylistChanges();
}
}
else
{
if(this.gch.IsAllocated)
{
UnhookPlaylistChanges();
}
}
}
}

private static String AdjustFilterString(String current, String filter, bool add)
{
String newFilter = null;
int findFilter = current.IndexOf(filter);
if(findFilter == -1)
{
if(add)
{
if(current.Length == 0)
{
newFilter = filter;
}
else
{
newFilter = String.Format("{0}:{1}", current, filter);
}
}
}
else
{
if(!add)
{
int colonAfterAdjust = current.IndexOf(':', findFilter + 1);
if(findFilter == 0)
{
if(colonAfterAdjust == -1)
{
newFilter = String.Empty;
}
else
{
newFilter = current.Substring(colonAfterAdjust + 1);
}
}
else
{
if(colonAfterAdjust == -1)
{
newFilter = current.Substring(0, findFilter - 1);
}
else
{
newFilter = current.Substring(0, findFilter - 1) +
current.Substring(colonAfterAdjust);
}
}
}
}
return newFilter;
}

const String VideoFilterList = "vout-filter";
const String AdjustFilter = "adjust";

public bool AllowVideoAdjustments
{
get
{
String voutFilter = GetVlcObjectString(ObjectType.VLC_OBJECT_VOUT, VideoFilterList, null);
if(voutFilter == null)
{
GetConfigVariable(VideoFilterList, out voutFilter);
}
if(voutFilter != null)
{
return voutFilter.IndexOf(AdjustFilter) != -1;
}
else
{
return false;
}
}
set
{
bool useConfig = false;
String voutFilter = GetVlcObjectString(ObjectType.VLC_OBJECT_VOUT, VideoFilterList, null);
if(voutFilter == null)
{
using(VlcObject vlc = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_VLC))
{
GetConfigVariable(VideoFilterList, out voutFilter);
useConfig = true;
}
}
if(voutFilter != null)
{
String newVoutFilter = AdjustFilterString(voutFilter, AdjustFilter, value);
if(newVoutFilter != null)
{
if(useConfig)
{
SetConfigVariable(VideoFilterList, newVoutFilter);
}
else
{
SetVlcObjectString(ObjectType.VLC_OBJECT_VOUT, VideoFilterList, newVoutFilter);
}
}
}
}
}

public VlcError AddTarget(string target, ref int itemId)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_PLAYLIST))
{
if(vobj.SubObject != IntPtr.Zero)
{
VlcError enmErr = playlist_AddExt(vobj.SubObject, target, target, Mode.Append,
EndOfPlaylist, -1L, null, 0);
if(enmErr >= VlcError.Success)
{
itemId = (int)enmErr;
}
return enmErr;
}
else
{
return VlcError.NoObj;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
return VlcError.Exception;
}
}

public VlcError AddTarget(string target, string[] options, ref int itemId)
{
int optionsCount = 0;
if(options != null)
{
optionsCount = options.Length;
}

try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_PLAYLIST))
{
if(vobj.SubObject != IntPtr.Zero)
{
VlcError enmErr = playlist_AddExt(vobj.SubObject, target, target, Mode.Append,
EndOfPlaylist, -1L, options, optionsCount);
if(enmErr >= VlcError.Success)
{
itemId = (int)enmErr;
}
return enmErr;
}
else
{
return VlcError.NoObj;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
return VlcError.Exception;
}
}

public Size VideoSize
{
get
{
try
{
using(VlcPlaylistObject vpobj = new VlcPlaylistObject(this.vlcHandle))
{
if(vpobj.SubObject != IntPtr.Zero)
{
IntPtr p_input = libvlc_playlist_get_input(ref vpobj.libvlc, ref vpobj.exception);
if(vpobj.exception.WasExceptionRaised())
{
this.lastErrorMessage = Marshal.PtrToStringAnsi(vpobj.exception.psz_message);
}
else
{
try
{
int width = libvlc_video_get_width(p_input, ref vpobj.exception);
if(!vpobj.exception.WasExceptionRaised())
{
int height = libvlc_video_get_height(p_input, ref vpobj.exception);
if(!vpobj.exception.WasExceptionRaised())
{
return new Size(width, height);
}
}
}
finally
{
libvlc_input_free(p_input);
}
}
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
}
return new Size();
}
}

public VlcError Play(int itemId)
{
try
{
this.artificialLength = 0;
this.timeScaling = 0.0d;
using(VlcPlaylistObject vpobj = new VlcPlaylistObject(this.vlcHandle))
{
if(vpobj.SubObject != IntPtr.Zero)
{
libvlc_playlist_play(ref vpobj.libvlc, itemId, 0, IntPtr.Zero,
ref vpobj.exception);
if(vpobj.exception.WasExceptionRaised())
{
return VlcError.Generic;
}
return VlcError.Success;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
return VlcError.Exception;
}
return VlcError.NoObj;
}

public VlcError Play()
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_PLAYLIST))
{
if(vobj.SubObject != IntPtr.Zero)
{
return playlist_LockControl(vobj.SubObject, playlist_command.PLAYLIST_PLAY);
}
else
{
return VlcError.NoObj;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
return VlcError.Exception;
}
}

public VlcError Pause()
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_PLAYLIST))
{
if(vobj.SubObject != IntPtr.Zero)
{
return playlist_LockControl(vobj.SubObject, playlist_command.PLAYLIST_PAUSE);
}
else
{
return VlcError.NoObj;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
return VlcError.Exception;
}
}

public VlcError Stop()
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_PLAYLIST))
{
if(vobj.SubObject != IntPtr.Zero)
{
return playlist_LockControl(vobj.SubObject, playlist_command.PLAYLIST_STOP);
}
else
{
return VlcError.NoObj;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
return VlcError.Exception;
}
}

public VlcError PlaylistClear()
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_PLAYLIST))
{
if(vobj.SubObject != IntPtr.Zero)
{
return playlist_Clear(vobj.SubObject);
}
else
{
return VlcError.NoObj;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
return VlcError.Exception;
}
}

public VlcError ToggleVolumeMute()
{
IntPtr vlc = vlc_current_object(vlcHandle);
if(IntPtr.Zero != vlc)
{
try
{
return __aout_VolumeMute(vlc, IntPtr.Zero);
}
catch(Exception)
{
}
finally
{
__vlc_object_release(vlc);
}
}
return VlcError.NoObj;
}

public VlcError PressKey(string strKey)
{
int key = GetVlcObjectInt(ObjectType.VLC_OBJECT_VLC, strKey, -666);
if(key != -666)
{
return SetVlcObjectInt(ObjectType.VLC_OBJECT_VLC, "key-pressed", key);
}
return VlcError.NoVar;
}

public VlcError ShowMessage(String message)
{
try
{
using(VlcObject vobj = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_INPUT))
{
if(vobj.SubObject != IntPtr.Zero)
{
__vout_OSDMessage(vobj.SubObject, DEFAULT_CHAN, message);
return VlcError.Success;
}
else
{
return VlcError.NoObj;
}
}
}
catch(Exception ex)
{
this.lastErrorMessage = ex.Message;
return VlcError.Exception;
}
}

public VlcError GetConfigVariable(String name, out String value)
{
value = null;
using(VlcObject vlc = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_VLC))
{
if(IntPtr.Zero == vlc.SubObject)
{
return VlcError.NoObj;
}

IntPtr p_item = config_FindConfig(vlc.SubObject, name);
if(IntPtr.Zero == p_item)
{
return VlcError.NoVar;
}

try
{
module_config_t mod = (module_config_t)Marshal.PtrToStructure(p_item, typeof(module_config_t));
switch(mod.i_type)
{
case CONFIG_ITEM.CONFIG_ITEM_BOOL:
{
bool result = (__config_GetInt(vlc.SubObject, name) == 0);
value = result.ToString();
}
break;
case CONFIG_ITEM.CONFIG_ITEM_INTEGER:
{
int intResult = __config_GetInt(vlc.SubObject, name);
value = intResult.ToString();
}
break;
case CONFIG_ITEM.CONFIG_ITEM_FLOAT:
{
float floatResult = __config_GetFloat(vlc.SubObject, name);
value = floatResult.ToString();
}
break;
case CONFIG_ITEM.CONFIG_ITEM_STRING:
value = __config_GetPsz(vlc.SubObject, name);
break;
default:
return VlcError.BadVar;
}
}
catch(Exception e)
{
this.lastErrorMessage = e.Message;
return VlcError.Exception;
}
}
return VlcError.Success;
}

public VlcError SetConfigVariable(String name, String value)
{
using(VlcObject vlc = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_VLC))
{
if(IntPtr.Zero == vlc.SubObject)
{
return VlcError.NoObj;
}

IntPtr p_item = config_FindConfig(vlc.SubObject, name);
if(IntPtr.Zero == p_item)
{
return VlcError.NoVar;
}
try
{
module_config_t mod = (module_config_t)Marshal.PtrToStructure(p_item, typeof(module_config_t));
switch(mod.i_type)
{
case CONFIG_ITEM.CONFIG_ITEM_BOOL:
{
bool boolResult;
if(Boolean.TryParse(value, out boolResult))
{
__config_PutInt(vlc.SubObject, name, boolResult ? 1 : 0);
}
else
{
return VlcError.BadVar;
}
}
break;
case CONFIG_ITEM.CONFIG_ITEM_INTEGER:
{
int intResult;
if(Int32.TryParse(value, out intResult))
{
__config_PutInt(vlc.SubObject, name, intResult);
}
else
{
return VlcError.BadVar;
}
}
break;
case CONFIG_ITEM.CONFIG_ITEM_FLOAT:
{
float floatResult;
if(Single.TryParse(value, out floatResult))
{
__config_PutFloat(vlc.SubObject, name, floatResult);
}
else
{
return VlcError.BadVar;
}
}
break;
case CONFIG_ITEM.CONFIG_ITEM_STRING:
__config_PutPsz(vlc.SubObject, name, value);
break;
default:
return VlcError.BadVar;
}
}
catch(Exception e)
{
this.lastErrorMessage = e.Message;
return VlcError.Exception;
}
}
return VlcError.Success;
}

#endregion

#region private members, properties and methods

private static string vlcInstallDirectory = "";
private int vlcHandle = -1;
private Control outputWindow = null;
private string lastErrorMessage = "";
private int artificialLength;
private double timeScaling;
private GCHandle gch;
private VarChangedCallback currentTrackCallback;
private string previousNowPlaying = String.Empty;

/// -------------------------------------------------------------------
/// <summary>
/// Method name : QueryVlcInstallPath
/// Author : Odysee
/// Date : 10.11.2006
/// </summary>
/// -------------------------------------------------------------------
private static string QueryVlcInstallPath()
{
// open registry
RegistryKey regkeyVlcInstallPathKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE/VideoLAN/VLC");
if(regkeyVlcInstallPathKey == null)
return "";
return (string)regkeyVlcInstallPathKey.GetValue("InstallDir","");
}

private void HookPlaylistChanges()
{
using(VlcObject vlc = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_PLAYLIST))
{
if(vlc.SubObject != IntPtr.Zero)
{
this.gch = GCHandle.Alloc(this);
this.currentTrackCallback = new VarChangedCallback(CurrentTrackChanged);

int isSet = __var_AddCallback(vlc.SubObject, Playlist_Current,
this.currentTrackCallback, (IntPtr)this.gch);
//Debug.WriteLine("__var_AddCallback playlistObject = " + isSet.ToString());
}
}
}

private void UnhookPlaylistChanges()
{
using(VlcObject vlc = new VlcObject(this.vlcHandle, ObjectType.VLC_OBJECT_PLAYLIST))
{
if(vlc.SubObject != IntPtr.Zero)
{
__var_DelCallback(vlc.SubObject, Playlist_Current,
this.currentTrackCallback, (IntPtr)this.gch);
}
}
this.gch.Free();
}

private static int CurrentTrackChanged(IntPtr vlc, String variable, vlc_value_t old_val,
vlc_value_t new_val, IntPtr param)
{
//Debug.WriteLine("CurrentTrackChanged: " + new_val.i_int.ToString());
GCHandle gch = (GCHandle)param;
NativeLibVlc thisVlc = (NativeLibVlc)gch.Target;
try
{
using(VlcObject vobj = new VlcObject(thisVlc.vlcHandle, ObjectType.VLC_OBJECT_INPUT))
{
if(vobj.SubObject != IntPtr.Zero)
{
IntPtr resultString = IntPtr.Zero;
input_Control(vobj.SubObject, input_query_e.INPUT_GET_INFO,
Meta_information, Now_Playing, ref resultString);
String nowPlaying = Marshal.PtrToStringAnsi(resultString);
if(nowPlaying != thisVlc.previousNowPlaying)
{
thisVlc.previousNowPlaying = nowPlaying;
Debug.WriteLine(String.Format("nowPlaying: {0}", nowPlaying));
thisVlc.VlcNowPlayingChanged(nowPlaying);
}
}
}
}
catch(Exception ex)
{
thisVlc.lastErrorMessage = ex.Message;
}
return (int)VlcError.Success;
}

#endregion
}

/* future features

add_bool( "brightness-threshold", 0, NULL,
THRES_TEXT, THRES_LONGTEXT, VLC_FALSE );
*/
}