misc.cpp

TMS320C6000 DSP实用技术与开发案例（书号：17481）源程序

//	VirtualDub - Video processing and capture application
//	Copyright (C) 1998-2001 Avery Lee
//
//	This program is free software; you can redistribute it and/or modify
//	it under the terms of the GNU General Public License as published by
//	the Free Software Foundation; either version 2 of the License, or
//	(at your option) any later version.
//
//	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 General Public License
//	along with this program; if not, write to the Free Software
//	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

#include <ctype.h>

#include <wtypes.h>
#include <mmsystem.h>

#include "misc.h"

long __declspec(naked) MulDivTrunc(long a, long b, long c) {
	__asm {
		mov eax,[esp+4]
		imul dword ptr [esp+8]
		idiv dword ptr [esp+12]
		ret
	}
}

int NearestLongValue(long v, const long *array, int array_size) {
	int i;

	for(i=1; i<array_size; i++)
		if (v*2 < array[i-1]+array[i])
			break;

	return i-1;
}

bool isEqualFOURCC(FOURCC fccA, FOURCC fccB) {
	int i;

	for(i=0; i<4; i++) {
		if (tolower((unsigned char)fccA) != tolower((unsigned char)fccB))
			return false;

		fccA>>=8;
		fccB>>=8;
	}

	return true;
}

FOURCC toupperFOURCC(FOURCC fcc) {
	return(toupper((unsigned char)(fcc>>24)) << 24)
		| (toupper((unsigned char)(fcc>>16)) << 16)
		| (toupper((unsigned char)(fcc>> 8)) <<  8)
		| (toupper((unsigned char)(fcc    ))      );
}