// Copyright (c) 2017-2019 Intel Corporation
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#ifndef __MFXPAK_H__
#define __MFXPAK_H__
#include "mfxdefs.h"
#include "mfxvstructures.h"
 
#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */
 
MFX_PACK_BEGIN_STRUCT_W_PTR()
MFX_DEPRECATED typedef struct {
    mfxU16 reserved[32];
 
    mfxFrameSurface1 *InSurface;
 
    mfxU16  NumFrameL0;
    mfxFrameSurface1 **L0Surface;
    mfxU16  NumFrameL1;
    mfxFrameSurface1 **L1Surface;
 
    mfxU16  NumExtParam;
    mfxExtBuffer    **ExtParam;
 
    mfxU16 NumPayload;
    mfxPayload      **Payload;
} mfxPAKInput;
MFX_PACK_END()
 
MFX_PACK_BEGIN_STRUCT_W_PTR()
MFX_DEPRECATED typedef struct {
    mfxU16  reserved[32];
 
    mfxBitstream     *Bs;
 
    mfxFrameSurface1 *OutSurface;
 
    mfxU16            NumExtParam;
    mfxExtBuffer    **ExtParam;
} mfxPAKOutput;
MFX_PACK_END()
 
typedef struct _mfxSession *mfxSession;
MFX_DEPRECATED mfxStatus MFX_CDECL MFXVideoPAK_Query(mfxSession session, mfxVideoParam *in, mfxVideoParam *out);
MFX_DEPRECATED mfxStatus MFX_CDECL MFXVideoPAK_QueryIOSurf(mfxSession session, mfxVideoParam *par, mfxFrameAllocRequest request[2]);
MFX_DEPRECATED mfxStatus MFX_CDECL MFXVideoPAK_Init(mfxSession session, mfxVideoParam *par);
MFX_DEPRECATED mfxStatus MFX_CDECL MFXVideoPAK_Reset(mfxSession session, mfxVideoParam *par);
MFX_DEPRECATED mfxStatus MFX_CDECL MFXVideoPAK_Close(mfxSession session);
 
MFX_DEPRECATED mfxStatus MFX_CDECL MFXVideoPAK_ProcessFrameAsync(mfxSession session, mfxPAKInput *in, mfxPAKOutput *out,  mfxSyncPoint *syncp);
 
MFX_DEPRECATED mfxStatus MFX_CDECL MFXVideoPAK_GetVideoParam(mfxSession session, mfxVideoParam *par);
 
#ifdef __cplusplus
} // extern "C"
#endif /* __cplusplus */
 
 
#endif

↑ V802 On 64-bit platform, structure size can be reduced from 136 to 112 bytes by rearranging the fields according to their sizes in decreasing order.