ホーム › Media.MediaFoundation › MFCreateVideoSampleAllocator

MFCreateVideoSampleAllocator

関数

ビデオサンプルアロケーターを作成する。

DLLEVR.dll呼出規約winapi

シグネチャ

// EVR.dll
#include <windows.h>

HRESULT MFCreateVideoSampleAllocator(
    const GUID* riid,
    void** ppSampleAllocator
);

パラメーター

名前	型	方向	説明
riid	GUID*	in	要求するアロケータインターフェイスのIIDへのポインタ。
ppSampleAllocator	void**	out	生成されたビデオサンプルアロケータを受け取るポインタのアドレス。

戻り値の型: HRESULT

各言語での呼び出し定義

// EVR.dll
#include <windows.h>

HRESULT MFCreateVideoSampleAllocator(
    const GUID* riid,
    void** ppSampleAllocator
);

[DllImport("EVR.dll", ExactSpelling = true)]
static extern int MFCreateVideoSampleAllocator(
    ref Guid riid,   // GUID*
    IntPtr ppSampleAllocator   // void** out
);

<DllImport("EVR.dll", ExactSpelling:=True)>
Public Shared Function MFCreateVideoSampleAllocator(
    ByRef riid As Guid,   ' GUID*
    ppSampleAllocator As IntPtr   ' void** out
) As Integer
End Function

' riid : GUID*
' ppSampleAllocator : void** out
Declare PtrSafe Function MFCreateVideoSampleAllocator Lib "evr" ( _
    ByVal riid As LongPtr, _
    ByVal ppSampleAllocator As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

MFCreateVideoSampleAllocator = ctypes.windll.evr.MFCreateVideoSampleAllocator
MFCreateVideoSampleAllocator.restype = ctypes.c_int
MFCreateVideoSampleAllocator.argtypes = [
    ctypes.c_void_p,  # riid : GUID*
    ctypes.c_void_p,  # ppSampleAllocator : void** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('EVR.dll')
MFCreateVideoSampleAllocator = Fiddle::Function.new(
  lib['MFCreateVideoSampleAllocator'],
  [
    Fiddle::TYPE_VOIDP,  # riid : GUID*
    Fiddle::TYPE_VOIDP,  # ppSampleAllocator : void** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "evr")]
extern "system" {
    fn MFCreateVideoSampleAllocator(
        riid: *const GUID,  // GUID*
        ppSampleAllocator: *mut *mut ()  // void** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("EVR.dll")]
public static extern int MFCreateVideoSampleAllocator(ref Guid riid, IntPtr ppSampleAllocator);
"@
$api = Add-Type -MemberDefinition $sig -Name 'EVR_MFCreateVideoSampleAllocator' -Namespace Win32 -PassThru
# $api::MFCreateVideoSampleAllocator(riid, ppSampleAllocator)

#uselib "EVR.dll"
#func global MFCreateVideoSampleAllocator "MFCreateVideoSampleAllocator" sptr, sptr
; MFCreateVideoSampleAllocator varptr(riid), ppSampleAllocator   ; 戻り値は stat
; riid : GUID* -> "sptr"
; ppSampleAllocator : void** out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

出力引数:

#uselib "EVR.dll"
#cfunc global MFCreateVideoSampleAllocator "MFCreateVideoSampleAllocator" var, sptr
; res = MFCreateVideoSampleAllocator(riid, ppSampleAllocator)
; riid : GUID* -> "var"
; ppSampleAllocator : void** out -> "sptr"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。#uselib "EVR.dll"
#cfunc global MFCreateVideoSampleAllocator "MFCreateVideoSampleAllocator" sptr, sptr
; res = MFCreateVideoSampleAllocator(varptr(riid), ppSampleAllocator)
; riid : GUID* -> "sptr"
; ppSampleAllocator : void** out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; HRESULT MFCreateVideoSampleAllocator(GUID* riid, void** ppSampleAllocator)
#uselib "EVR.dll"
#cfunc global MFCreateVideoSampleAllocator "MFCreateVideoSampleAllocator" var, intptr
; res = MFCreateVideoSampleAllocator(riid, ppSampleAllocator)
; riid : GUID* -> "var"
; ppSampleAllocator : void** out -> "intptr"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。; HRESULT MFCreateVideoSampleAllocator(GUID* riid, void** ppSampleAllocator)
#uselib "EVR.dll"
#cfunc global MFCreateVideoSampleAllocator "MFCreateVideoSampleAllocator" intptr, intptr
; res = MFCreateVideoSampleAllocator(varptr(riid), ppSampleAllocator)
; riid : GUID* -> "intptr"
; ppSampleAllocator : void** out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	evr = windows.NewLazySystemDLL("EVR.dll")
	procMFCreateVideoSampleAllocator = evr.NewProc("MFCreateVideoSampleAllocator")
)

// riid (GUID*), ppSampleAllocator (void** out)
r1, _, err := procMFCreateVideoSampleAllocator.Call(
	uintptr(riid),
	uintptr(ppSampleAllocator),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function MFCreateVideoSampleAllocator(
  riid: PGUID;   // GUID*
  ppSampleAllocator: Pointer   // void** out
): Integer; stdcall;
  external 'EVR.dll' name 'MFCreateVideoSampleAllocator';

result := DllCall("EVR\MFCreateVideoSampleAllocator"
    , "Ptr", riid   ; GUID*
    , "Ptr", ppSampleAllocator   ; void** out
    , "Int")   ; return: HRESULT

●MFCreateVideoSampleAllocator(riid, ppSampleAllocator) = DLL("EVR.dll", "int MFCreateVideoSampleAllocator(void*, void*)")
# 呼び出し: MFCreateVideoSampleAllocator(riid, ppSampleAllocator)
# riid : GUID* -> "void*"
# ppSampleAllocator : void** out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。