sdpmdgen.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: sdpmdgen.cpp,v 1.14.2.1 2004/07/09 02:05:16 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 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 (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
 * 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.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * 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 "sdpmdgen.h"

#include "sdptypes.h"
#include "sdppyldinfo.h"
#include "hxstrutl.h"
#include "hxstring.h"
#include "nptime.h"
#include "netbyte.h"
#include "rtsputil.h"
#include "rtptypes.h"
//#include "hlxclib/stdio.h"

SDPMediaDescGenerator::SDPMediaDescGenerator(ULONG32 ulVersion) :
    m_pContext(0),
    m_pCCF(0),
    m_pRegistry(0),
    m_ulVersion(ulVersion),
    m_bUseOldEOL(FALSE),
    m_bUseSessionGUID(FALSE),
    m_bUseAbsoluteURL(FALSE)
{}

SDPMediaDescGenerator::~SDPMediaDescGenerator()
{
    HX_RELEASE(m_pCCF);
    HX_RELEASE(m_pContext);
    HX_RELEASE(m_pRegistry);
}

HX_RESULT SDPMediaDescGenerator::Init(IUnknown* pContext)
{
    HX_RESULT res = HXR_FAILED;

    HX_RELEASE(m_pContext);
    HX_RELEASE(m_pCCF);

    if (pContext)
    {
        pContext->QueryInterface(IID_IHXRegistry, (void**)&m_pRegistry);

        res = pContext->QueryInterface(IID_IHXCommonClassFactory,
                                       (void**)&m_pCCF);
        if (SUCCEEDED(res) && m_pCCF)
        {
            m_pContext = pContext;
            m_pContext->AddRef();
        }
    }

    return res;
}

HX_RESULT SDPMediaDescGenerator::Generate(UINT16 nValues, 
                                          IHXValues** pValueArray,
                                          REF(IHXBuffer*) pDescription)
{
    CHXString mDesc;

    char pszEOL[3]; /* Flawfinder: ignore */
    HX_RESULT rc;
    UINT32 propValue;
    const char* pPropName = 0;
    IHXBuffer* pPropBuffer = 0;
    char psz256[256]; /* Flawfinder: ignore */

    mDesc.SetMinBufSize(12000);

    if (m_bUseOldEOL)
    {
        pszEOL[0] = '\n';
        pszEOL[1] = '\0';
    }
    else
    {
        pszEOL[0] = '\r';
        pszEOL[1] = '\n';
        pszEOL[2] = '\0';
    }

    rc = SpecComplianceCheck(nValues, pValueArray);    
    if (HXR_OK != rc)
    {
        return rc;
    }
    // get local host address from registry

    //HX_RESULT hresult;
    IHXRegistry* pRegistry = 0;

    /*  XXX 
     *  Interop:  Our old system is expecting a media type in m= to be either
     *  "audio", "video", or "data" and anything else will be ignored.  
     *  The spec dectates otherwise...It should be whatever the type of mimetype
     *  is.  So, depending on the setting, we will have to change how we create 
     *  m= line for interop and backward comp.
     *
     *  by default, we will do the spec complient way.
     */    
    BOOL bUseOldSdp = FALSE;
    IHXBuffer* pHostIBuf = NULL;

    if(m_pRegistry)
    {
        m_pRegistry->GetStrByName("server.sdpconfig.hostaddr", pHostIBuf);
    }

    const char* pszHost = "";

    if (pHostIBuf)
    {
        pszHost = (const char *)pHostIBuf->GetBuffer();
    }

    UINT32 ulHostAddr = HXinet_addr(pszHost);

    /*
     * default sessionID, else get LastModified from optional values
     */

    char pszVersion[40]; /* Flawfinder: ignore */
    UINT32 ulSessionIDBuffLen = 40;
    IHXBuffer* pSessionGUIDBuff = NULL;
    IHXBuffer* pControlStringBuff = NULL;

    if(m_bUseSessionGUID && pValueArray[1])
    {
        rc = pValueArray[1]->GetPropertyCString("SessionGUID", pSessionGUIDBuff);

        if((rc == HXR_OK) && pSessionGUIDBuff)
        {
            ulSessionIDBuffLen = pSessionGUIDBuff->GetSize();
        }
    }
    NEW_FAST_TEMP_STR(pszSessionID, 256, ulSessionIDBuffLen);

    // munge current time with IP
    NPTime timeNow;
    if (!pSessionGUIDBuff)
    {
        SafeSprintf(pszSessionID,ulSessionIDBuffLen,"%lu", ulHostAddr + timeNow.m_lMicroSecond); 
    }

    SafeSprintf(pszVersion, 40, "%lu", timeNow.m_lMicroSecond); 

    IHXBuffer* pContentBase = NULL;
    IHXBuffer* pQueryParams = NULL;
    if(pValueArray[1])
    {
        ULONG32 ulLastMod;

        rc = pValueArray[1]->GetPropertyULONG32("LastModified", ulLastMod);

        SafeSprintf(pszVersion, 40,"%lu", ulLastMod);

        if (pSessionGUIDBuff)
        {
            SafeSprintf(pszSessionID, ulSessionIDBuffLen, "%s", 
                     pSessionGUIDBuff->GetBuffer());
        }
        else
        {
            SafeSprintf(pszSessionID, ulSessionIDBuffLen,"%lu", ulLastMod);
        }

        if (m_bUseAbsoluteURL)
        {
            rc = pValueArray[1]->GetPropertyCString("AbsoluteBaseURL",
                                                    pContentBase);
            if (HXR_OK != rc)
            {
                HX_RELEASE(pContentBase);
            }
            
            rc = pValueArray[1]->GetPropertyCString("URLQueryParams",
                                                    pQueryParams);
            if (HXR_OK != rc)
            {
                HX_RELEASE(pQueryParams);
            }
        }

        rc = pValueArray[1]->GetPropertyCString("Control", pControlStringBuff);
        if(rc != HXR_OK)
        {
            HX_RELEASE(pControlStringBuff);
        }
    }

    NEW_FAST_TEMP_STR(pszTmpString, 256, strlen(pszSessionID) + 
                      strlen(pszVersion) + strlen(pszHost) + 64);

    SafeSprintf(pszTmpString, 256, "v=0%so=- %s %s IN IP4 %s%s",
        pszEOL, pszSessionID, pszVersion, pszHost, pszEOL);

    HX_RELEASE(pHostIBuf);
    HX_RELEASE(pSessionGUIDBuff);
    DELETE_FAST_TEMP_STR(pszSessionID);

    mDesc = pszTmpString;

    DELETE_FAST_TEMP_STR(pszTmpString);

    char* pszTitle = NULL;
    char* pszAuthor = NULL;
    char* pszCopyright = NULL;

    CHXString headerAttributes;
    headerAttributes.SetMinBufSize(8192);

    char* pszSDPData=NULL;
    char* pszInfo=NULL;
    
    char* pszConnAddr=NULL;

    UINT32 avgBitRate = 0;
    BOOL   bFoundAvgBitRate = FALSE;
    UINT32 connTTL = 0;
    BOOL   bFoundTTL = FALSE;
    UINT32 connRange = 0;
    BOOL   bFoundRange = FALSE;
    BOOL   bAddToHeader = 0;
    UINT32 ulDefaultDuration = 0;
    BOOL   bDefaultDurationFound = FALSE;
    BOOL   bIsLive = FALSE;
    
    /*
     * Add session-level a=control field only for clients that can handle
     * interop SDP.
     */

    // Figure out if the client can handle interop SDP
    UINT32 ulSdpFileType = NONE_SDP;
    if (HXR_OK == pValueArray[0]->GetPropertyULONG32("SdpFileType", ulSdpFileType))
    {
        // default for bUseOldSdp is FALSE
        if (BACKWARD_COMP_SDP == ulSdpFileType)
        {
            bUseOldSdp = TRUE;
        }
    }

    if(!bUseOldSdp) 
    {
        if (!pControlStringBuff)
        {
            const char* pszFieldPrefix = "a=control:";
            UINT32 ulBuffLen = 0;

            if (pContentBase)
            {
                char *pszBaseURL = (char*)pContentBase->GetBuffer();
                UINT32 ulBaseLen = strlen(pszBaseURL);
                UINT32 ulBuffLen = strlen(pszFieldPrefix) + ulBaseLen +
                                   ((pQueryParams) ? pQueryParams->GetSize() : 0);
                char cPathDelim = '\0';

                // Strip off the trailing slash from the aggregate control URL
                char *pszPathDelim = pszBaseURL + (ulBaseLen-1);
                if (*pszPathDelim == '/')
                {
                    cPathDelim = *pszPathDelim;
                    *pszPathDelim = '\0';
                }

                ulBuffLen += strlen(pszEOL) + 1;
                NEW_FAST_TEMP_STR(pszSessionCtrl, 512, ulBuffLen); 
                SafeSprintf(pszSessionCtrl, ulBuffLen, "%s%s%s%s", 
                         pszFieldPrefix, pszBaseURL,
                         (pQueryParams)?((char*)pQueryParams->GetBuffer()) : "",
                         pszEOL);

                if (cPathDelim)
                {
                    *pszPathDelim = cPathDelim;
                }
                headerAttributes += pszSessionCtrl;
                DELETE_FAST_TEMP_STR(pszSessionCtrl);
            }
            else 
            {
                ulBuffLen = strlen(pszFieldPrefix) + strlen(pszEOL) + 2;
                NEW_FAST_TEMP_STR(pszSessionCtrl, 512, ulBuffLen); 
                SafeSprintf(pszSessionCtrl, ulBuffLen, "%s*%s", pszFieldPrefix, pszEOL);
                headerAttributes += pszSessionCtrl;
                DELETE_FAST_TEMP_STR(pszSessionCtrl);
            }
        }
        else
        {
            UINT32 ulBuffLen = pControlStringBuff->GetSize();
            ulBuffLen += (pContentBase) ? pContentBase->GetSize() : 0;
            ulBuffLen += (pQueryParams) ? pQueryParams->GetSize() : 0;
            ulBuffLen += 64;

            NEW_FAST_TEMP_STR(pszControlString, 512, ulBuffLen); 
            SafeSprintf(pszControlString, ulBuffLen, "a=control:%s%s%s%s",
                     ((pContentBase) ? ((char*)pContentBase->GetBuffer()) : ""),
                     pControlStringBuff->GetBuffer(),
                     (pQueryParams) ?((char*)pQueryParams->GetBuffer()) : "", 
                     pszEOL);

            headerAttributes += pszControlString;
            DELETE_FAST_TEMP_STR(pszControlString);
        }
    }

    rc = pValueArray[0]->GetFirstPropertyULONG32(pPropName, propValue);

    while(rc == HXR_OK)
    {
        bAddToHeader = FALSE;

        if(strcasecmp(pPropName, "MulticastTTL") == 0)
        {
            connTTL = propValue;
            bFoundTTL = TRUE;
        }
        else if(strcasecmp(pPropName, "MulticastRange") == 0)
        {
            connRange = propValue;
            bFoundRange = TRUE;
        }
        else if(strcasecmp(pPropName, "Duration") == 0)
        {
            // save this off, so we can add an appropriate a=range depending
            // on the value in "SdpFileType"
            ulDefaultDuration = propValue;
            bDefaultDurationFound = TRUE;
        }
        else if(strcasecmp(pPropName, "LiveStream") == 0)
        {
            // is this live?
            bIsLive = propValue;
            bAddToHeader = TRUE;
        }
        else if(strcasecmp(pPropName, "AvgBitRate") == 0)
        {
            avgBitRate = propValue;

            // we need this in kbps
            avgBitRate = (UINT32)((double)avgBitRate / 1000.0 + 0.5);
            bFoundAvgBitRate = TRUE;

            // add it to attribute as well.         
            bAddToHeader = TRUE;    
        }
        else if(strcasecmp(pPropName, "SdpFileType") == 0)
        {