convert.cpp

DRAWYUV程序是用于摄像头的数据回放,用了directshow,可以用在VC和wince都可

/*
 * Convert.cpp
 *
 * Convert colorspace
 *
 * DirectDraw YUV420P project
 *
 * Copyright (c) 2004-2005 for Cyansoft Studio.
 * All Rights Reserved.
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: Convert.cpp,v $
 * Revision 1.1  2005/01/17 13:42:59  jin.bai
 * Initial revision
 *
 *
 */
#include <windows.h>

#include "YUV2RGB.H"
#include "Convert.h"

//
// Global macro
//
#define  SOURCE_BIT_COUNT       12
#define  SOURCE_COLOR_SPACE     mmioFOURCC ('I', '4', '2', '0')  // YUV420P or I420 or IYUV

#define  NONETYPE               0
#define  YUV2RGB32              1
#define  YUV2RGB24              2
#define  YUV2RGB565             3
#define  YUV2RGB555             4
#define  YUV2YUY2               5

//
// Convert class
//
Converter::Converter() : m_lpBuffer (NULL), m_dwVideoType (NONETYPE), m_pConvert (NULL)
{
	m_vfSource.vfBitCount = SOURCE_BIT_COUNT;
	m_vfSource.vfFourCC = SOURCE_COLOR_SPACE;	
}

Converter::~Converter()
{
	if (m_lpBuffer)
	{
		free (m_lpBuffer);
		m_lpBuffer = NULL;
	}	
}

BOOL Converter::Create(PVIDEO_FORMAT_T pVfSource, PVIDEO_FORMAT_T pVfDest)
{
	// Check if the input param is NULL
	if (!pVfSource || !pVfDest) return FALSE;
	
	if (pVfSource->vfBitCount != m_vfSource.vfBitCount ||
		pVfSource->vfFourCC != m_vfSource.vfFourCC)
	{
		return FALSE;
	}

	// Same width and same height
	if (pVfSource->vfWidth != pVfDest->vfWidth ||
		pVfSource->vfHeight != pVfDest->vfHeight)
	{
		return FALSE;
	}

	switch (pVfDest->vfFourCC)
	{
	case BI_RGB:
		if (pVfDest->vfBitCount == 32)
		{
			m_dwVideoType = YUV2RGB32;
			m_vfDest.vfBitCount = 32;
			m_pConvert = yuv2rgb_32;
		}
		else if (pVfDest->vfBitCount == 24)
		{
			m_dwVideoType =YUV2RGB24;
			m_vfDest.vfBitCount = 24;
			m_pConvert = yuv2rgb_24;
		}
		else if (pVfDest->vfBitCount == 16) 
		{
			m_dwVideoType = YUV2RGB565;
			m_vfDest.vfBitCount = 16;
			m_pConvert = yuv2rgb_565;
		}
		else if (pVfDest->vfBitCount == 15) 
		{
			m_dwVideoType = YUV2RGB555;
			m_vfDest.vfBitCount = 16;
			m_pConvert = yuv2rgb_555;
		}
		else
		{
			m_dwVideoType = NONETYPE;
		}
		break;

	case mmioFOURCC('Y', 'U', 'Y', '2'):
		m_dwVideoType = YUV2YUY2;
		m_vfDest.vfBitCount = 16;
		m_pConvert = yuy2_out;
		break;

	default: 
		m_dwVideoType = NONETYPE;
		break;
	}

	if (m_dwVideoType != NONETYPE)
	{
		// Save
		m_vfDest.vfWidth = pVfDest->vfWidth;
		m_vfDest.vfHeight = pVfDest->vfHeight;
		m_vfDest.vfFourCC = pVfDest->vfFourCC;

		m_vfSource.vfWidth = pVfSource->vfWidth;
		m_vfSource.vfHeight = pVfSource->vfHeight;

		return AllocBuffer(&m_vfDest);
	}

	return FALSE;
}

BOOL Converter::AllocBuffer(PVIDEO_FORMAT_T pVidFormat)
{
	if (m_lpBuffer)
	{
		free (m_lpBuffer);
		m_lpBuffer = NULL;
	}	

	// Alloc buffer
    m_lpBuffer = (LPBYTE) malloc((pVidFormat->vfWidth * pVidFormat->vfHeight * pVidFormat->vfBitCount) >> 3);

	return m_lpBuffer != NULL;
}
BOOL Converter::Convert(LPBYTE lpSourceBuffer, LPBYTE *lppDestBuffer)
{
	BOOL bRtn = FALSE;

	if (!lpSourceBuffer || !lppDestBuffer) return bRtn;

	if (!m_lpBuffer || m_dwVideoType == NONETYPE || !m_pConvert) return bRtn;

	__try
	{
		(*m_pConvert)(lpSourceBuffer, m_vfSource.vfWidth, (LPBYTE)lpSourceBuffer + (m_vfSource.vfWidth * m_vfSource.vfHeight), \
			(LPBYTE)lpSourceBuffer + ((m_vfSource.vfWidth * m_vfSource.vfHeight * 5) >> 2), \
			m_vfSource.vfWidth >> 1, m_lpBuffer, m_vfDest.vfWidth, m_vfDest.vfHeight, m_vfDest.vfWidth);
		
		(*lppDestBuffer) = m_lpBuffer;

		bRtn = TRUE;
	}
	__except(EXCEPTION_EXECUTE_HANDLER)
	{
		bRtn = FALSE;
	}	
	
	return bRtn;
}