mpapayld.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (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 RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

#include "hxtypes.h"
#include "hxwintyp.h"
#include "hxcom.h"
#include "hxcomm.h"

#include "hxassert.h"
#include "hxslist.h"
#include "hxmarsh.h"
#include "hxcomm.h"
#include "ihxpckts.h"
#include "hxformt.h"
#include "hxrendr.h"
#include "hxformt.h"
#include "hxengin.h"
#include "mhead.h"

#include "mpapayld.h"


MPAPayloadFormat::MPAPayloadFormat()
    : m_lRefCount	    (0)
    , m_pContext	    (NULL)
    , m_pClassFactory	    (NULL)
    , m_pStreamHeader	    (NULL)
    , m_ulStreamNum	    (0)
    , m_bPacketizing	    (FALSE)
    , m_ulFrameSize	    (0)
    , m_bFragmentFrames	    (FALSE)
    , m_ulFramesPerPacket   (0)
    , m_ulPacketsPerFrame   (0)
    , m_ulFrameOffset	    (0)
    , m_bFlushed	    (FALSE)
    , m_pInputPackets	    (NULL)
    , m_ulInputSize	    (0)
    , m_ulInputUsed	    (0)
    , m_pPartialPacket	    (NULL)
    , m_pPartialBuffer	    (NULL)
    , m_ulMaxPacketSize	    (0)
{
    m_pInputPackets = new CHXSimpleList();
}

MPAPayloadFormat::~MPAPayloadFormat()
{
    HX_RELEASE(m_pContext);
    HX_RELEASE(m_pClassFactory);
    HX_RELEASE(m_pStreamHeader);

    if (!m_pInputPackets->IsEmpty())
    {
	IHXPacket* pPacket = (IHXPacket*)m_pInputPackets->RemoveHead();
	HX_RELEASE(pPacket);
    }
    HX_DELETE(m_pInputPackets);

    HX_RELEASE(m_pPartialPacket);
    HX_RELEASE(m_pPartialBuffer);
}

// *** IUnknown methods ***

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IUnknown::QueryInterface
//  Purpose:
//	Implement this to export the interfaces supported by your 
//	object.
//
STDMETHODIMP 
MPAPayloadFormat::QueryInterface(REFIID riid, void** ppvObj)
{
    if (IsEqualIID(riid, IID_IUnknown))
    {
	AddRef();
	*ppvObj = this;
	return HXR_OK;
    }
    else if (IsEqualIID(riid, IID_IHXPayloadFormatObject))
    {
	AddRef();
	*ppvObj = (IHXPayloadFormatObject*)this;
	return HXR_OK;
    }

    *ppvObj = NULL;
    return HXR_NOINTERFACE;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IUnknown::AddRef
//  Purpose:
//	Everyone usually implements this the same... feel free to use
//	this implementation.
//
STDMETHODIMP_(ULONG32) 
MPAPayloadFormat::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IUnknown::Release
//  Purpose:
//	Everyone usually implements this the same... feel free to use
//	this implementation.
//
STDMETHODIMP_(ULONG32) 
MPAPayloadFormat::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
        return m_lRefCount;
    }

    delete this;
    return 0;
}


STDMETHODIMP 
MPAPayloadFormat::Init(IUnknown* pContext,
		       BOOL bPacketize)
{
    HX_ASSERT(pContext);

    HX_RELEASE(m_pContext);
    m_pContext = pContext;
    m_pContext->AddRef();

    m_pContext->QueryInterface(IID_IHXCommonClassFactory, 
	(void**)&m_pClassFactory);
    HX_ASSERT(m_pClassFactory);

    // Remember if we are packetizing or depacketizing
    m_bPacketizing = bPacketize;

    return HXR_OK;
}

STDMETHODIMP
MPAPayloadFormat::Reset()
{
    // Release all input packets we have stored
    if (!m_pInputPackets->IsEmpty())
    {
	IHXPacket* pPacket = (IHXPacket*)m_pInputPackets->RemoveHead();
	HX_RELEASE(pPacket);
    }

    // Reset all relevant state variables
    m_ulFrameSize	= 0;
    m_bFragmentFrames	= FALSE;
    m_ulFramesPerPacket	= 0;
    m_ulPacketsPerFrame	= 0;
    m_ulFrameOffset	= 0;
    m_bFlushed		= FALSE;
    m_ulInputSize	= 0;
    m_ulInputUsed	= 0;
    HX_RELEASE(m_pPartialPacket);
    HX_RELEASE(m_pPartialBuffer);

    return HXR_OK;
}

STDMETHODIMP 
MPAPayloadFormat::SetStreamHeader(IHXValues* pHeader)
{
    HX_ASSERT(pHeader);
    m_pStreamHeader = pHeader;
    m_pStreamHeader->AddRef();

    m_pStreamHeader->GetPropertyULONG32("StreamNumber", m_ulStreamNum);

    m_pStreamHeader->GetPropertyULONG32("MaxPacketSize", m_ulMaxPacketSize);

    HX_ASSERT(m_ulMaxPacketSize > 4);
    // We will add 4 Bytes of header data,
    m_ulMaxPacketSize -= 4;

    return HXR_OK;
}

STDMETHODIMP 
MPAPayloadFormat::GetStreamHeader(REF(IHXValues*) pHeader)
{
    HX_ASSERT(m_pStreamHeader);
    pHeader = m_pStreamHeader;
    pHeader->AddRef();

    return HXR_OK;
}

STDMETHODIMP 
MPAPayloadFormat::SetPacket(IHXPacket* pPacket)
{
    HX_RESULT hResult = HXR_OK;
    IHXBuffer* pBuffer = NULL;

    HX_ASSERT(pPacket);
    pBuffer = pPacket->GetBuffer();

    // Add this packet to our list of input packets
    pPacket->AddRef();
    m_pInputPackets->AddTail(pPacket);
    m_ulInputSize += pBuffer->GetSize();

    if (m_bPacketizing && !m_ulFrameSize)
    {
	UINT32 ulBytesSkipped = 0;

	m_ulFrameSize = GetFrameSize(pBuffer->GetBuffer(), 
	    pBuffer->GetSize(), ulBytesSkipped);

	if (ulBytesSkipped)
	{
	    // If we had to skip any Bytes to find the header
	    // info, discard those leading Bytes as garbage
	    m_ulInputUsed = ulBytesSkipped;
	    m_ulInputSize -= ulBytesSkipped;
	}

	if (m_ulFrameSize &&
	    m_ulFrameSize <= m_ulMaxPacketSize)
	{
	    // An integral number of frames can fit into
	    // one packet, so pack them accordingly
	    m_bFragmentFrames = FALSE;
	    m_ulFramesPerPacket = m_ulMaxPacketSize / m_ulFrameSize;
	}
	else if (m_ulFrameSize)
	{
	    // Not even 1 entire frame will fit into one packet, 
	    // so break each frame up across multiple packets
	    m_bFragmentFrames = TRUE;
	    m_ulPacketsPerFrame = (m_ulFrameSize / m_ulMaxPacketSize) + 1;
	}
	else
	{
	    // We couldn't figure out the frame size, so toss
	    // this packet and return a failure code
	    m_pInputPackets->RemoveHead();
	    HX_RELEASE(pPacket);

	    hResult = HXR_FAIL;
	}
    }
    HX_RELEASE(pBuffer);

    return hResult;
}

STDMETHODIMP 
MPAPayloadFormat::GetPacket(REF(IHXPacket*) pPacket)
{
    HX_RESULT hResult = HXR_OK;
    pPacket = NULL;

    if (m_pInputPackets->IsEmpty())
    {
	if (m_bFlushed)
	{
	    // We have used up all available input
	    hResult = HXR_STREAM_DONE;
	}
	else
	{
	    // We don't have enough input 
	    // data to produce a packet
	    hResult = HXR_INCOMPLETE;
	}
    }
    else if (m_bPacketizing)
    {
	// We are converting normal packets into
	// RTP packets...

	if (m_bFragmentFrames)
	{
	    hResult = CreateFragmentedPacket(pPacket);
	}
	else
	{
	    hResult = CreateNormalPacket(pPacket);
	}
    }
    else
    {
	// We are converting RTP packets back into
	// normal packets...

	hResult = UnformatRTPPacket(pPacket);
    }

    return hResult;
}

STDMETHODIMP 
MPAPayloadFormat::Flush()
{
    m_bFlushed = TRUE;

    return HXR_OK;
}

UINT32
MPAPayloadFormat::GetFrameSize(UCHAR* pBuffer, 
			       UINT32 ulSize, 
			       REF(UINT32) ulBytesSkipped)
{
    UCHAR* pStart = pBuffer;
    UINT32 ulFrameSize = 0;
    ulBytesSkipped = ulSize;

    HX_ASSERT(pBuffer);
    HX_ASSERT(ulSize);

    if (pBuffer && ulSize)
    {
	MPEG_HEAD h;
	INT32 iFrameSize = 0;
	BOOL bCheckWord = FALSE;

	for (UINT32 i = 0; i < ulSize; i++)
	{
            bCheckWord = ((pStart[i] & 0xF0) == 0xF0) |
                         ((pStart[i] & 0xF0) == 0xE0);

	    if (bCheckWord)
	    {
		memset(&h, 0, sizeof(h));
		iFrameSize = head_info(&pStart[i], ulSize - i, &h, 0);

		if (iFrameSize)
		{
		    ulFrameSize = (UINT32)iFrameSize;
		    ulBytesSkipped = i;
		    break;
		}
	    }
	}
    }

    return ulFrameSize;
}

UINT32
MPAPayloadFormat::GetFrameOffset(IHXBuffer* pBuffer)
{
    UCHAR* pBuf = NULL;
    
    HX_ASSERT(pBuffer);
    pBuf = pBuffer->GetBuffer();
    HX_ASSERT(pBuf);

    // Skip the first 2 Bytes which are specified
    // as "reserved" in RFC 2250
    pBuf += 2;

    // The next two Bytes contain the frame offset
    return (UINT32)getshort(pBuf);
}

HX_RESULT
MPAPayloadFormat::CreateNormalPacket(REF(IHXPacket*) pPacket)
{
    HX_RESULT hResult = HXR_OK;
    UINT32 ulBufSize = 0;
    UCHAR* pBuf = NULL;
    IHXPacket* pNewPacket = NULL;
    IHXBuffer* pNewBuffer = NULL;

    if ((m_ulInputSize < (m_ulFramesPerPacket * m_ulFrameSize)) && 
	!m_bFlushed)
    {
	// We don't have enough input 
	// data to produce a packet
	hResult = HXR_INCOMPLETE;
    }
    else
    {
	// Create a new packet
	m_pClassFactory->CreateInstance(CLSID_IHXPacket, 
	    (void**)&pNewPacket);

	// Create a new buffer
	m_pClassFactory->CreateInstance(CLSID_IHXBuffer, 
	    (void**)&pNewBuffer);

	// Figure out what the timestamp should be
	UINT32 ulNewTimestamp = GetNextTimestamp();

	// Set the size of the buffer appropriately
	ulBufSize = (m_ulFrameSize * m_ulFramesPerPacket);
	if (m_ulInputSize < ulBufSize)
	{
	    // We must have been flushed, so fill the packet
	    // with whatever remaining data we have
	    HX_ASSERT(m_bFlushed);
	    ulBufSize = m_ulInputSize;
	}
	ulBufSize += 4;

	pNewBuffer->SetSize(ulBufSize);
	pBuf = pNewBuffer->GetBuffer();