/*  Copyright (c) MediaArea.net SARL. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license that can
 *  be found in the License.html file in the root of the source tree.
 */
 
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// Contributor: Lionel Duchateau, kurtnoise@free.fr
//
// From : http://www.webmproject.org/
// Specs: http://wiki.multimedia.cx/index.php?title=IVF
//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
//---------------------------------------------------------------------------
// Pre-compilation
#include "MediaInfo/PreComp.h"
#ifdef __BORLANDC__
    #pragma hdrstop
#endif
//---------------------------------------------------------------------------
 
//---------------------------------------------------------------------------
#include "MediaInfo/Setup.h"
//---------------------------------------------------------------------------
 
//---------------------------------------------------------------------------
#if defined(MEDIAINFO_IVF_YES)
//---------------------------------------------------------------------------
 
//---------------------------------------------------------------------------
#include "MediaInfo/Multiple/File_Ivf.h"
//---------------------------------------------------------------------------
 
namespace MediaInfoLib
{
 
//***************************************************************************
// Buffer - File header
//***************************************************************************
 
//---------------------------------------------------------------------------
bool File_Ivf::FileHeader_Begin()
{
    //Synchro
    if (4>Buffer_Size)
        return false;
    if (Buffer[0]!=0x44 //"DKIF"
     || Buffer[1]!=0x4B
     || Buffer[2]!=0x49
     || Buffer[3]!=0x46)
    {
        Reject();
        return false;
    }
    if (6>Buffer_Size)
        return false;
 
    return true;
}
 
//---------------------------------------------------------------------------
void File_Ivf::FileHeader_Parse()
{
    //Parsing
    int32u frame_rate_num, frame_rate_den, frame_count, fourcc;
    int16u version, header_size, width, height;
 
    Skip_C4 (                                                   "Signature");
    Get_L2 (version,                                            "Version");
    if (version==0)
    {
        Get_L2 (header_size,                                    "Header Size");
        if (header_size>=32)
        {
            Get_C4 (fourcc,                                     "Fourcc");
            Get_L2 (width,                                      "Width");
            Get_L2 (height,                                     "Height");
            Get_L4 (frame_rate_num,                             "FrameRate Numerator");
            Get_L4 (frame_rate_den,                             "FrameRate Denominator");
            Get_L4 (frame_count,                                "Frame Count");
            Skip_L4(                                            "Unused");
            if (header_size-32)
                Skip_XX(header_size-32,                         "Unknown");
        }
        else
        {
            fourcc=0x00000000;
            width=0;
            height=0;
            frame_rate_num=0;
            frame_rate_den=0;
            frame_count=0;
        }
    }
    else
    {
        header_size=0;
        fourcc=0x00000000;
        width=0;
        height=0;
        frame_rate_num=0;
        frame_rate_den=0;
        frame_count=0;
    }
 
    FILLING_BEGIN();
        Accept("IVF");
 
        Fill(Stream_General, 0, General_Format, "IVF");
 
        if (version==0 && header_size>=32)
        {
            Stream_Prepare(Stream_Video);
            CodecID_Fill(Ztring().From_CC4(fourcc), Stream_Video, 0, InfoCodecID_Format_Riff);
            Fill(Stream_Video, 0, Video_FrameRate, (float)frame_rate_num / frame_rate_den);
            Fill(Stream_Video, 0, Video_FrameCount, frame_count);
            Fill(Stream_Video, 0, Video_Width, width);
            Fill(Stream_Video, 0, Video_Height, height);
            Fill(Stream_Video, 0, Video_StreamSize, File_Size-header_size-12*frame_count); //Overhead is 12 byte per frame
        }
 
        //No more need data
        Finish("IVF");
    FILLING_END();
}
 
} //NameSpace
 
#endif //MEDIAINFO_IVF_*

↑ V793 It is odd that the result of the 'header_size - 32' statement is a part of the condition. Perhaps, this statement should have been compared with something else.