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using System;
using System.Globalization;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace mpv
{
public partial class Form1 : Form
{
private const int MpvFormatString = 1;
private IntPtr _libMpvDll;
private IntPtr _mpvHandle;
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Ansi, BestFitMapping = false)]
internal static extern IntPtr LoadLibrary(string dllToLoad);
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Ansi, BestFitMapping = false)]
internal static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate IntPtr MpvCreate();
private MpvCreate _mpvCreate;
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate int MpvInitialize(IntPtr mpvHandle);
private MpvInitialize _mpvInitialize;
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate int MpvCommand(IntPtr mpvHandle, IntPtr strings);
private MpvCommand _mpvCommand;
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate int MpvTerminateDestroy(IntPtr mpvHandle);
private MpvTerminateDestroy _mpvTerminateDestroy;
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate int MpvSetOption(IntPtr mpvHandle, byte[] name, int format, ref long data);
private MpvSetOption _mpvSetOption;
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate int MpvSetOptionString(IntPtr mpvHandle, byte[] name, byte[] value);
private MpvSetOptionString _mpvSetOptionString;
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate int MpvGetPropertystring(IntPtr mpvHandle, byte[] name, int format, ref IntPtr data);
private MpvGetPropertystring _mpvGetPropertyString;
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate int MpvSetProperty(IntPtr mpvHandle, byte[] name, int format, ref byte[] data);
private MpvSetProperty _mpvSetProperty;
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate void MpvFree(IntPtr data);
private MpvFree _mpvFree;
public Form1()
{
InitializeComponent();
}
private object GetDllType(Type type, string name)
{
IntPtr address = GetProcAddress(_libMpvDll, name);
if (address != IntPtr.Zero)
return Marshal.GetDelegateForFunctionPointer(address, type);
return null;
}
private void LoadMpvDynamic()
{
_libMpvDll = LoadLibrary("mpv-1.dll"); // The dll is included in the DEV builds by lachs0r: https://mpv.srsfckn.biz/
_mpvCreate = (MpvCreate)GetDllType(typeof(MpvCreate), "mpv_create");
_mpvInitialize = (MpvInitialize)GetDllType(typeof(MpvInitialize), "mpv_initialize");
_mpvTerminateDestroy = (MpvTerminateDestroy)GetDllType(typeof(MpvTerminateDestroy), "mpv_terminate_destroy");
_mpvCommand = (MpvCommand)GetDllType(typeof(MpvCommand), "mpv_command");
_mpvSetOption = (MpvSetOption)GetDllType(typeof(MpvSetOption), "mpv_set_option");
_mpvSetOptionString = (MpvSetOptionString)GetDllType(typeof(MpvSetOptionString), "mpv_set_option_string");
_mpvGetPropertyString = (MpvGetPropertystring)GetDllType(typeof(MpvGetPropertystring), "mpv_get_property");
_mpvSetProperty = (MpvSetProperty)GetDllType(typeof(MpvSetProperty), "mpv_set_property");
_mpvFree = (MpvFree)GetDllType(typeof(MpvFree), "mpv_free");
}
public void Pause()
{
if (_mpvHandle == IntPtr.Zero)
return;
var bytes = GetUtf8Bytes("yes");
_mpvSetProperty(_mpvHandle, GetUtf8Bytes("pause"), MpvFormatString, ref bytes);
}
private void Play()
{
if (_mpvHandle == IntPtr.Zero)
return;
var bytes = GetUtf8Bytes("no");
_mpvSetProperty(_mpvHandle, GetUtf8Bytes("pause"), MpvFormatString, ref bytes);
}
public bool IsPaused()
{
if (_mpvHandle == IntPtr.Zero)
return true;
var lpBuffer = IntPtr.Zero;
_mpvGetPropertyString(_mpvHandle, GetUtf8Bytes("pause"), MpvFormatString, ref lpBuffer);
var isPaused = Marshal.PtrToStringAnsi(lpBuffer) == "yes";
_mpvFree(lpBuffer);
return isPaused;
}
public void SetTime(double value)
{
if (_mpvHandle == IntPtr.Zero)
return;
DoMpvCommand("seek", value.ToString(CultureInfo.InvariantCulture), "absolute");
}
private static byte[] GetUtf8Bytes(string s)
{
return Encoding.UTF8.GetBytes(s + "\0");
}
public static IntPtr AllocateUtf8IntPtrArrayWithSentinel(string[] arr, out IntPtr[] byteArrayPointers)
{
int numberOfStrings = arr.Length + 1; // add extra element for extra null pointer last (sentinel)
byteArrayPointers = new IntPtr[numberOfStrings];
IntPtr rootPointer = Marshal.AllocCoTaskMem(IntPtr.Size * numberOfStrings);
for (int index = 0; index < arr.Length; index++)
{
var bytes = GetUtf8Bytes(arr[index]);
IntPtr unmanagedPointer = Marshal.AllocHGlobal(bytes.Length);
Marshal.Copy(bytes, 0, unmanagedPointer, bytes.Length);
byteArrayPointers[index] = unmanagedPointer;
}
Marshal.Copy(byteArrayPointers, 0, rootPointer, numberOfStrings);
return rootPointer;
}
private void DoMpvCommand(params string[] args)
{
IntPtr[] byteArrayPointers;
var mainPtr = AllocateUtf8IntPtrArrayWithSentinel(args, out byteArrayPointers);
_mpvCommand(_mpvHandle, mainPtr);
foreach (var ptr in byteArrayPointers)
{
Marshal.FreeHGlobal(ptr);
}
Marshal.FreeHGlobal(mainPtr);
}
private void buttonPlay_Click(object sender, EventArgs e)
{
if (_mpvHandle != IntPtr.Zero)
_mpvTerminateDestroy(_mpvHandle);
LoadMpvDynamic();
if (_libMpvDll == IntPtr.Zero)
return;
_mpvHandle = _mpvCreate.Invoke();
if (_mpvHandle == IntPtr.Zero)
return;
_mpvInitialize.Invoke(_mpvHandle);
_mpvSetOptionString(_mpvHandle, GetUtf8Bytes("keep-open"), GetUtf8Bytes("always"));
int mpvFormatInt64 = 4;
var windowId = pictureBox1.Handle.ToInt64();
_mpvSetOption(_mpvHandle, GetUtf8Bytes("wid"), mpvFormatInt64, ref windowId);
DoMpvCommand("loadfile", textBoxVideoSampleFileName.Text);
}
private void buttonPlayPause_Click(object sender, EventArgs e)
{
if (IsPaused())
Play();
else
Pause();
}
private void buttonStop_Click(object sender, EventArgs e)
{
Pause();
SetTime(0);
}
private void buttonLoadVideo_Click(object sender, EventArgs e)
{
openFileDialog1.FileName = String.Empty;
if (openFileDialog1.ShowDialog(this) == DialogResult.OK)
{
textBoxVideoSampleFileName.Text = openFileDialog1.FileName;
buttonPlay_Click(null, null);
}
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (_mpvHandle != IntPtr.Zero)
_mpvTerminateDestroy(_mpvHandle);
}
}
}
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