rfc2190hlpr.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: rfc2190hlpr.cpp,v 1.1.1.1.42.1 2004/07/09 01:56:41 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * The contents of this file, and the files included with this file,
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 * Source License (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
 * will apply. You may also obtain the license terms directly from
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 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
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 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
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 * ***** END LICENSE BLOCK ***** */

#include "./rfc2190hlpr.h"
#include "bitpack.h"

CRFC2190Helper::CRFC2190Helper() :
    m_bPictureStart(FALSE),
    m_ulDataSize(0),
    m_pPayload(0),
    m_ulStartOffset(0)
{}

CRFC2190Helper::~CRFC2190Helper()
{}
    
HX_RESULT CRFC2190Helper::OnPacket(const UINT8* pBuf, ULONG32 ulBufSize)
{
    HX_RESULT res = HXR_FAILED;

    m_bPictureStart = FALSE;
    m_ulDataSize = 0;
    m_pPayload = 0;
    m_ulStartOffset = 0;

    if (ulBufSize > 12)
    {
	m_ulStartOffset = ((ULONG32)(pBuf[0] >> 3)) & 0x7; // SBIT
	ULONG32 ulEBIT = (ULONG32)pBuf[0] & 0x7;

	if (pBuf[0] & 0x80) // Check F bit
	    if (pBuf[0] & 0x40) // Check P bit
	    {
		if (((pBuf[3] & 0x3) == 0) && // Check all the reserved bits
		    (pBuf[8] == 0) &&
		    (pBuf[9] == 0) &&
		    ((pBuf[10] & 0xE0) == 0))
		{
		    // This is a Mode C packet (Section 5.3)
		    m_pPayload = pBuf + 12;
		    res = HXR_OK;
		}
	    }
	    else
	    {
		if ((pBuf[3] & 0x3) == 0) // Check for reserved bits
		{
		    // This is a Mode B packet (Section 5.2)
		    m_pPayload = pBuf + 8;
		    res = HXR_OK;
		}
	    }
	else if (((pBuf[1] & 0x1) == 0) && // Check for reserved bits
		 ((pBuf[2] & 0xe) == 0))
	{
	    // This is a Mode A packet (Section 5.1)
	    m_pPayload = pBuf + 4;

	    if ((pBuf[4] == 0x00) &&  // Check for PSC
		(pBuf[5] == 0x00) &&
		((pBuf[6] & 0xfc) == 0x80))
		m_bPictureStart = TRUE;
	}

	if (SUCCEEDED(res))
	    m_ulDataSize = ((ulBufSize - (m_pPayload - pBuf) ) * 8 - 
			    (m_ulStartOffset + ulEBIT));
    }

    return res;
}

BOOL CRFC2190Helper::IsPictureStart() const
{
    return m_bPictureStart;
}

ULONG32 CRFC2190Helper::DataSize() const // in bits
{
    return m_ulDataSize;
}

HX_RESULT CRFC2190Helper::CopyPayload(BitPacker& bp)
{
    HX_RESULT res = HXR_FAILED;

    bp.PackBits(m_pPayload, m_ulDataSize, m_ulStartOffset);

    return res;
}