LiveRTMP 之RTMP直播高效推送缓冲区

 

LiveRTMP 的推送缓冲区设计

LiveRTMP 内部也同样采用的环形缓冲的设计方法，将音视频数据都同时存入缓冲区，再由发送者从缓冲区中获取数据进行发送，这样就形成了一个异步、生产者、消费者的过程，上层调用者只需要将采集、编码后的音视频Frame数据Push到SDK的缓冲区中，即可返回继续进行上层逻辑操作，SDK内部的发送线程则从缓冲区中不断获取音视频数据推送到流媒体服务器；

LiveRTMP缓冲区

缓冲区丢帧策略

有缓冲区，势必会出现缓冲区满的情况，当这个时候，就需要合理的丢帧策略了，当缓冲区新增一帧进入缓冲区时，此时缓冲区已经满了，那么我们就要从缓冲区的读指针部分开始丢弃非关键帧P帧，直到遇到I帧就停止丢帧，再将新来的数据帧增加进入缓冲区，这样既可以保证一个较合理的直播推送缓冲区，确保推送延时可控，又能够保证不会出现花屏的问题；

LiveRTMP推送缓冲区实现

int     SSQ_Init(SS_QUEUE_OBJ_T *pObj, unsigned int sharememory, unsigned int channelid, wchar_t *sharename, unsigned int bufsize, unsigned int prerecordsecs, unsigned int createsharememory)
{
    wchar_t wszHeaderName[36] = {0,};
    wchar_t wszFramelistName[36] = {0,};
    wchar_t wszDataName[36] = {0,};
    if (NULL==pObj)                                         return -1;
    if (createsharememory==0x01 && bufsize<1)               return -1;
    if ( (sharememory==0x01) && (NULL==sharename || (0==wcscmp(sharename, TEXT("\0")))) )   return -1;

    memset(pObj, 0x00, sizeof(SS_QUEUE_OBJ_T));
    pObj->channelid = channelid;
    pObj->shareinfo.id = channelid;
    wcscpy(pObj->shareinfo.name, sharename);

    wchar_t wszMutexName[36] = {0,};
    wsprintf(wszMutexName, TEXT("%s%d_mutex"), sharename, channelid);
    pObj->hMutex = OpenMutex(NULL, FALSE, wszMutexName);
    if (NULL == pObj->hMutex)
    {
        pObj->hMutex = CreateMutex(NULL, FALSE, wszMutexName);
        if (NULL == pObj->hMutex)                           return -1;
    }

    //Create Header map


#ifdef _WIN32
    if (sharememory == 0x01)
    {
        wsprintf(wszHeaderName, TEXT("%s%d_h"), sharename, channelid);
        pObj->hSSHeader = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, wszHeaderName);
        if (NULL==pObj->hSSHeader && createsharememory==0x01)
        {
            pObj->hSSHeader = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE|SEC_COMMIT, 0, sizeof(SS_HEADER_T), wszHeaderName);
            if (NULL==pObj->hSSHeader || pObj->hSSHeader==INVALID_HANDLE_VALUE)
            {
                return -1;
            }
        }
        pObj->pQueHeader = (SS_HEADER_T*)MapViewOfFile(pObj->hSSHeader, FILE_MAP_READ|FILE_MAP_WRITE, 0, 0, 0);
        if (createsharememory==0x01)
        {
            if (pObj->pQueHeader->bufsize < 1)
            {
                memset(pObj->pQueHeader, 0x00, sizeof(SS_HEADER_T));
                pObj->pQueHeader->bufsize = bufsize;
            }
        }
        else if (NULL==pObj->pQueHeader)
        {
            return -1;
        }
        else
        {
            bufsize = pObj->pQueHeader->bufsize;
        }
    }
    else
    {
        pObj->pQueHeader = new SS_HEADER_T;
        memset(pObj->pQueHeader, 0x00, sizeof(SS_HEADER_T));
    }

    //==========================================
    //Create frame list map
    if (prerecordsecs > 0)
    {
        wsprintf(wszFramelistName, TEXT("%s%d_f"), sharename, channelid);
        unsigned int nFramelistNum = prerecordsecs * 30;    //每秒30帧
        unsigned int nFrameQueSize = nFramelistNum*sizeof(FRAMEINFO_LIST_T);

        if (sharememory == 0x01)
        {
            pObj->hSSFrameList = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, wszFramelistName);
            if (NULL==pObj->hSSFrameList && createsharememory==0x01)
            {
                pObj->hSSFrameList = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE|SEC_COMMIT, 0, nFrameQueSize, wszFramelistName);
                if (NULL==pObj->hSSFrameList || pObj->hSSFrameList==INVALID_HANDLE_VALUE)
                {
                    return -1;
                }
            }
            pObj->pFrameinfoList = (FRAMEINFO_LIST_T*)MapViewOfFile(pObj->hSSFrameList, FILE_MAP_READ|FILE_MAP_WRITE, 0, 0, 0);
            if (createsharememory==0x01)
            {
                memset(pObj->pFrameinfoList, 0x00, nFrameQueSize);
                pObj->pQueHeader->framelistNum = nFramelistNum;
            }
            else if (NULL==pObj->hSSFrameList)
            {
                return -1;
            }
        }
        else
        {
            pObj->pFrameinfoList = new FRAMEINFO_LIST_T[nFramelistNum];
            memset(&pObj->pFrameinfoList[0], 0x00, sizeof(FRAMEINFO_LIST_T)*nFramelistNum);
            pObj->pQueHeader->framelistNum = nFramelistNum;
        }
    }

    //Create data map   
    if (sharememory == 0x01)
    {
        wsprintf(wszDataName, TEXT("%s%d_b"), sharename, channelid);
        pObj->hSSData   = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, wszDataName);
        if (NULL==pObj->hSSData && createsharememory==0x01)
        {
            pObj->hSSData = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE|SEC_COMMIT, 0, bufsize, wszDataName);
        }
        if (NULL == pObj->hSSData || pObj->hSSData==INVALID_HANDLE_VALUE)
        {
            return -1;
        }
        pObj->pQueData = (char*)MapViewOfFile(pObj->hSSData, FILE_MAP_READ|FILE_MAP_WRITE, 0, 0, 0);
    }
    else
    {
        pObj->pQueData = new char [bufsize];
        pObj->pQueHeader->bufsize = bufsize;
    }
    if (createsharememory==0x01)
    {
        //memset(pQueHeader, 0x00, sizeof(SS_HEADER_T));
        memset(pObj->pQueData, 0x00, bufsize);
    }
#else
    int ret = shm_create((SYNC_VID_SHM_KEY<<8)|channelid, &pObj->shmHdrid, sizeof(SS_HEADER_T), (char**)&pObj->pQueHeader);
    if (ret < 0)
    {
        return -1;
    }
    SSQ_TRACE("[%d]pQueHeader: %d\n", (SYNC_VID_SHM_KEY<<8)|channelid, pObj->shmHdrid);
    ret = shm_create((SYNC_VID_SHM_KEY<<16)|channelid, &pObj->shmDatid, bufsize, (char**)&pObj->pQueData);
    if (ret < 0)
    {
        shm_delete(&pObj->shmHdrid, (char*)pObj->pQueHeader);
        return -1;
    }
    pObj->pQueHeader->bufsize = bufsize;
    SSQ_TRACE("[%d]pQueData: %d\n", (SYNC_VID_SHM_KEY<<16)|channelid, pObj->shmDatid);
#endif

    return 0;
}
int     SSQ_Deinit(SS_QUEUE_OBJ_T *pObj)
{
    if (NULL == pObj)       return -1;


#ifdef _WIN32

    if (NULL != pObj->hMutex)
    {
        CloseHandle(pObj->hMutex);
        pObj->hMutex = NULL;
    }

    if (NULL != pObj->hSSHeader)
    {
        if (! UnmapViewOfFile(pObj->pQueHeader))
        {
        }
        pObj->pQueHeader = NULL;
        CloseHandle(pObj->hSSHeader);
        pObj->hSSHeader = NULL;
    }
    if (NULL != pObj->pQueHeader)
    {
        delete []pObj->pQueHeader;
        pObj->pQueHeader = NULL;
    }

    if (NULL != pObj->hSSData)
    {
        if (! UnmapViewOfFile(pObj->pQueData))
        {
        }
        pObj->pQueData = NULL;
        CloseHandle(pObj->hSSData);
        pObj->hSSData = NULL;
    }
    if (NULL != pObj->pQueData)
    {
        delete []pObj->pQueData;
        pObj->pQueData = NULL;
    }
    if (NULL != pObj->hSSFrameList)
    {
        if (! UnmapViewOfFile(pObj->pFrameinfoList))
        {
        }
        pObj->pFrameinfoList = NULL;
        CloseHandle(pObj->hSSFrameList);
        pObj->hSSFrameList = NULL;
    }
    if (NULL != pObj->pFrameinfoList)
    {
        delete []pObj->pFrameinfoList;
        pObj->pFrameinfoList = NULL;
    }

#else
    if (pObj->shmHdrid>0 && pObj->pQueHeader!=NULL)
    {
        shm_delete(&pObj->shmHdrid, (char*)pObj->pQueHeader);
    }
    if (pObj->shmDatid>0 && pObj->pQueData!=NULL)
    {
        shm_delete(&pObj->shmDatid, (char*)pObj->pQueData);
        pObj->pQueData = NULL;
    }
#endif
    return 0;
}

int     SSQ_SetClearFlag(SS_QUEUE_OBJ_T *pObj, unsigned int _flag)
{
    if (NULL == pObj)       return -1;
    if (NULL==pObj->pQueData)       return -1;

    pObj->pQueHeader->clear_flag = _flag;
    return 0;
}
int     SSQ_Clear(SS_QUEUE_OBJ_T *pObj)
{
    if (NULL == pObj)       return -1;
    if (NULL==pObj->pQueData)       return -1;


    //WaitForSingleObject(pObj->hMutex, INFINITE);
    //Lock();
    pObj->pQueHeader->writepos = 0;
    pObj->pQueHeader->readpos  = 0;
    pObj->pQueHeader->totalsize= 0;

    pObj->pQueHeader->videoframes = 0;  //视频帧数

    pObj->pQueHeader->maxframeno = 0;
    pObj->pQueHeader->frameno = 0;

    memset(pObj->pQueData, 0x00, pObj->pQueHeader->bufsize);

    //ReleaseMutex(pObj->hMutex);

    //Unlock();
    return 0;
}

int SSQ_AddFrameInfo(SS_QUEUE_OBJ_T *pObj, unsigned int _pos, MEDIA_FRAME_INFO *frameinfo)
{
    if (NULL == pObj)                   return -1;
    if (NULL == pObj->pQueHeader)       return -1;
    if (NULL == pObj->pFrameinfoList)   return -1;

    if ( pObj->pQueHeader->frameno+1 > pObj->pQueHeader->framelistNum)
    {
        memmove((char*)pObj->pFrameinfoList, (char*)pObj->pFrameinfoList+sizeof(FRAMEINFO_LIST_T), sizeof(FRAMEINFO_LIST_T)*pObj->pQueHeader->framelistNum-1);
        pObj->pQueHeader->frameno --;
        pObj->pQueHeader->maxframeno = pObj->pQueHeader->frameno+1;
    }

    pObj->pFrameinfoList[pObj->pQueHeader->frameno].pos = pObj->pQueHeader->writepos;
#ifdef _DEBUG1
    static int nTimestamp = 0;
    pObj->pQueHeader->pFrameinfoList[pObj->pQueHeader->frameno].timestamp = ++nTimestamp;
#else
    pObj->pFrameinfoList[pObj->pQueHeader->frameno].timestamp_sec = frameinfo->timestamp_sec;
    pObj->pFrameinfoList[pObj->pQueHeader->frameno].rtp_timestamp = frameinfo->timestamp_sec*1000+frameinfo->timestamp_usec/1000;
#endif
    //SSQ_TRACE("帧号: %d\n", pObj->pQueHeader->frameno);
    pObj->pQueHeader->frameno ++;
    pObj->pQueHeader->maxframeno = pObj->pQueHeader->frameno;

/*
    if ( pObj->pQueHeader->frameno >= pObj->pQueHeader->framelistNum)
    {
        SSQ_TRACE("max frame: %d\n", pObj->pQueHeader->maxframeno);
        pObj->pQueHeader->frameno = 0;
    }
    if (pObj->pQueHeader->frameno > pObj->pQueHeader->maxframeno)
    {
        pObj->pQueHeader->maxframeno = pObj->pQueHeader->frameno;
    }
*/
    return 0;
}

int     SSQ_AddData(SS_QUEUE_OBJ_T *pObj, unsigned int channelid, unsigned int mediatype, MEDIA_FRAME_INFO *frameinfo, char *pbuf)
{
    int ret = 0;
    SS_BUF_T    bufNode;


    if (NULL==pObj || NULL==frameinfo || NULL==pbuf)        return -1;
    if (NULL == pObj->pQueData)                 return -1;
    if (NULL == pObj->pQueHeader)               return -1;
    if (frameinfo->length < 1)
    {
#ifdef _DEBUG
        SSQ_TRACE("frame length < 1: %d\n", frameinfo->length);
#endif
        return -1;
    }

#ifdef _DEBUG1
    SSQ_TRACE("frame: %02x%02x%02x%02x%02x\n", (unsigned char)pbuf[0],
                (unsigned char)pbuf[1],
                (unsigned char)pbuf[2],
                (unsigned char)pbuf[3],
                (unsigned char)pbuf[4]);
#endif

    if (frameinfo->length > pObj->pQueHeader->bufsize)
    {
        SSQ_TRACE("Buffer too low.. Current Frame Size: %d\tBuffer Size: %d\n", frameinfo->length, pObj->pQueHeader->bufsize);
        return -1;
    }



    WaitForSingleObject(pObj->hMutex, INFINITE);        //Lock

    if (pObj->pQueHeader->clear_flag == 0x01)
    {
        //SSQ_TRACE("Received clear signal... Clear Buffer..\n");
        SSQ_TRACE("clear cache..  WritePos: %d\n", pObj->pQueHeader->writepos);
        SSQ_Clear(pObj);
        pObj->pQueHeader->clear_flag = 0x00;
    }

    if (pObj->pQueHeader->writepos == pObj->pQueHeader->readpos)
    {
        if (pObj->pQueHeader->totalsize < 0 || pObj->pQueHeader->videoframes < 0)
        {
            SSQ_TRACE("write speed==read speed...  data length exception: %d    video frames:%d\n", pObj->pQueHeader->totalsize, pObj->pQueHeader->videoframes);
        }
        //Clear();
    }

    if (sizeof(SS_BUF_T) + frameinfo->length + pObj->pQueHeader->totalsize > pObj->pQueHeader->bufsize)
    {
        SSQ_TRACE("beyond ssqueue length.. len:%d\ttotalsize:%d\tbufsize:%d  cache frames:%d\n", frameinfo->length, pObj->pQueHeader->totalsize, pObj->pQueHeader->bufsize, pObj->pQueHeader->videoframes);
        ReleaseMutex(pObj->hMutex);
        pObj->pQueHeader->isfull = 0x01;
        return -1;
    }

    pObj->pQueHeader->isfull = 0x00;

    memset(&bufNode, 0x00, sizeof(SS_BUF_T));
    memcpy(&bufNode.frameinfo, frameinfo, sizeof(MEDIA_FRAME_INFO));
    bufNode.channelid = channelid;//++m_FrameTally;
    bufNode.mediatype = mediatype;
    bufNode.flag    =   BUF_QUE_FLAG;

    //_TRACE("WritePos: %d    totalSize: %d\n", pQueHeader->writepos, pQueHeader->totalsize);

    //Lock();
    if ((pObj->pQueHeader->writepos + sizeof(SS_BUF_T) + frameinfo->length) <= pObj->pQueHeader->bufsize)
    {
        //copy to queue
        if (mediatype==MEDIA_TYPE_VIDEO)    SSQ_AddFrameInfo(pObj, pObj->pQueHeader->writepos, frameinfo);

        unsigned int nAdd = pObj->pQueHeader->writepos;
        memcpy(pObj->pQueData+nAdd, &bufNode, sizeof(SS_BUF_T));
        nAdd += sizeof(SS_BUF_T);

        memcpy(pObj->pQueData+nAdd, pbuf, frameinfo->length);
        nAdd += frameinfo->length;
        pObj->pQueHeader->writepos = nAdd;
        pObj->pQueHeader->totalsize+= sizeof(SS_BUF_T);
        pObj->pQueHeader->totalsize+= frameinfo->length;

        if (mediatype==MEDIA_TYPE_VIDEO)    pObj->pQueHeader->videoframes ++;

        //_TRACE("顺序新增..  writepos: %d   /   %d\n", pQueHeader->writepos, pQueHeader->size);
    }
    else if (pObj->pQueHeader->writepos == pObj->pQueHeader->bufsize)   //从头开始
    {
        //记录帧位置
        if (mediatype==MEDIA_TYPE_VIDEO)    SSQ_AddFrameInfo(pObj, 0, frameinfo);


        memcpy(pObj->pQueData, &bufNode, sizeof(SS_BUF_T));
        pObj->pQueHeader->writepos = sizeof(SS_BUF_T);

        memcpy(pObj->pQueData+pObj->pQueHeader->writepos, pbuf, frameinfo->length);
        pObj->pQueHeader->writepos += frameinfo->length;

        pObj->pQueHeader->totalsize= sizeof(SS_BUF_T);
        pObj->pQueHeader->totalsize+= frameinfo->length;

        if (mediatype==MEDIA_TYPE_VIDEO)    pObj->pQueHeader->videoframes ++;

        SSQ_TRACE("从头开始写..  writepos: %d\n", pObj->pQueHeader->writepos);
    }
    //else if (pQueHeader->size - pQueHeader->writepos+pQueHeader->readpos >= (int)(frameinfo->length+sizeof(SS_BUF_T)))    //从尾写到头
    //else if (pObj->pQueHeader->bufsize - pObj->pQueHeader->writepos+pObj->pQueHeader->readpos >= (int)(frameinfo->length+sizeof(SS_BUF_T)))   //从尾写到头
    else// if (pObj->pQueHeader->bufsize - pObj->pQueHeader->writepos >= (int)(frameinfo->length+sizeof(SS_BUF_T))) //从尾写到头
    {
        unsigned int remain = pObj->pQueHeader->bufsize - pObj->pQueHeader->writepos;   //剩余空间
        if (remain>=sizeof(SS_BUF_T))
        {
            unsigned int nAdd = pObj->pQueHeader->writepos;

            //记录帧位置
            if (mediatype==MEDIA_TYPE_VIDEO)    SSQ_AddFrameInfo(pObj, nAdd, frameinfo);

            //_TRACE("WritePos111: %d\n", pQueHeader->writepos);
            memcpy(pObj->pQueData+nAdd, &bufNode, sizeof(SS_BUF_T));
            nAdd += sizeof(SS_BUF_T);
            //pQueHeader->totalsize+= sizeof(SS_BUF_T);
            //_TRACE("WritePos222: %d\n", pQueHeader->writepos+sizeof(SS_BUF_T));
            remain = pObj->pQueHeader->bufsize - nAdd;//pQueHeader->writepos;
            //_TRACE("WritePos: %d\n", pQueHeader->writepos+sizeof(SS_BUF_T)+remain);
            if (remain>0)
            {
                memcpy(pObj->pQueData+nAdd, pbuf, remain);
                memcpy(pObj->pQueData, pbuf+remain, frameinfo->length-remain);
                nAdd = frameinfo->length-remain;

                pObj->pQueHeader->writepos = nAdd;
                pObj->pQueHeader->totalsize+= sizeof(SS_BUF_T);
                pObj->pQueHeader->totalsize+= frameinfo->length;

                if (pObj->pQueHeader->totalsize>pObj->pQueHeader->bufsize)
                {
                    //原因:  rtsp server已停止读该队列(当前没有客户端访问)
                    SSQ_TRACE("[RTSP Server已停止读取该队列]错误 %d > %d    frameinfo->length:%d...\n", pObj->pQueHeader->totalsize, pObj->pQueHeader->bufsize, frameinfo->length);
                    //SSQ_Clear(pObj);
                }
                else
                {
                    if (mediatype==MEDIA_TYPE_VIDEO)    pObj->pQueHeader->videoframes ++;

                    //SSQ_TRACE("111Header及部分帧数据位于缓存尾, 部分帧数据位于缓存首..  remain: %d   writepos: %d  totalsize: %d\n", remain, pObj->pQueHeader->writepos, pObj->pQueHeader->totalsize);
                }
            }
            else if (remain==0)
            {
                memcpy(pObj->pQueData, pbuf, frameinfo->length);
                nAdd = frameinfo->length;
                pObj->pQueHeader->writepos = nAdd;
                pObj->pQueHeader->totalsize+= sizeof(SS_BUF_T);
                pObj->pQueHeader->totalsize+= frameinfo->length;

                if (mediatype==MEDIA_TYPE_VIDEO)    pObj->pQueHeader->videoframes ++;

                if (pObj->pQueHeader->totalsize>pObj->pQueHeader->bufsize)
                {
                    SSQ_TRACE("错误222 %d > %d    frameinfo->length:%d...\n", pObj->pQueHeader->totalsize, pObj->pQueHeader->bufsize, frameinfo->length);
                    //SSQ_Clear(pObj);
                }
                else
                {
                    SSQ_TRACE("22222Header位于缓存尾,帧数据位于缓存首..  writepos: %d\n", pObj->pQueHeader->writepos);
                }
            }
            else
            {
                SSQ_TRACE("错误...  剩余空间小于0: %d\n", remain);
                ret = -1;
            }
        }
        else if (remain>0)
        {
            char *tmpbuf = (char *)&bufNode;


            unsigned int nAdd = pObj->pQueHeader->writepos;

            //记录帧位置
            if (mediatype==MEDIA_TYPE_VIDEO)    SSQ_AddFrameInfo(pObj, nAdd, frameinfo);


            //SSQ_TRACE("ADD DATA...%d\n", nAdd);
            memcpy(pObj->pQueData+nAdd, tmpbuf, remain);
            //SSQ_TRACE("ADD DATA222...%d\n", sizeof(SS_BUF_T)-remain);
            memcpy(pObj->pQueData, tmpbuf+remain, sizeof(SS_BUF_T)-remain);
            nAdd = sizeof(SS_BUF_T)-remain;
            memcpy(pObj->pQueData+nAdd, pbuf, frameinfo->length);

            nAdd += frameinfo->length;
            pObj->pQueHeader->writepos  = nAdd;
            pObj->pQueHeader->totalsize+= sizeof(SS_BUF_T);
            pObj->pQueHeader->totalsize+= frameinfo->length;

            if (pObj->pQueHeader->totalsize>pObj->pQueHeader->bufsize)
            {
                SSQ_TRACE("错误333 %d > %d    frameinfo->length:%d...\n", pObj->pQueHeader->totalsize, pObj->pQueHeader->bufsize, frameinfo->length);
                //SSQ_Clear(pObj);
            }

            if (mediatype==MEDIA_TYPE_VIDEO)    pObj->pQueHeader->videoframes ++;
        }
        else
        {
            ret = -1;
            SSQ_TRACE("ERROR...\n");
        }
    }
    //else
    {
        //else if (pObj->pQueHeader->bufsize - pObj->pQueHeader->writepos+pObj->pQueHeader->readpos >= (int)(frameinfo->length+sizeof(SS_BUF_T)))   //从尾写到头
        //SSQ_TRACE("写尾错误..  未处理.  写位置:%d / pObj->pQueHeader->bufsize  读位置:%d\n", pObj->pQueHeader->writepos, pObj->pQueHeader->bufsize, pObj->pQueHeader->readpos);
    }
    //Unlock();

    ReleaseMutex(pObj->hMutex);

    //SSQ_TRACE("writepos: %d\ttotalsize: %d\n", pObj->pQueHeader->writepos, pObj->pQueHeader->totalsize);

#ifdef _DEBUG1
    if (mediatype==MEDIA_TYPE_VIDEO)
    {
        SSQ_TRACE("==========================\n");
        for (int i=0; i<pObj->pQueHeader->maxframeno; i++)
        {
            SSQ_TRACE("[%d] times: %d   pos: %d   %02X%02X%02X%02X%02X\n", i, pObj->pQueHeader->pFrameinfoList[i].timestamp, pObj->pQueHeader->pFrameinfoList[i].pos,
                (unsigned char)pObj->pQueData[pObj->pQueHeader->pFrameinfoList[i].pos+sizeof(SS_BUF_T)+0], (unsigned char)pObj->pQueData[pObj->pQueHeader->pFrameinfoList[i].pos+sizeof(SS_BUF_T)+1], (unsigned char)pObj->pQueData[pObj->pQueHeader->pFrameinfoList[i].pos+sizeof(SS_BUF_T)+2], 
                (unsigned char)pObj->pQueData[pObj->pQueHeader->pFrameinfoList[i].pos+sizeof(SS_BUF_T)+3], (unsigned char)pObj->pQueData[pObj->pQueHeader->pFrameinfoList[i].pos+sizeof(SS_BUF_T)+4]);
        }
    }
#endif


    return ret;
}
int     SSQ_GetData(SS_QUEUE_OBJ_T *pObj, unsigned int *channelid, unsigned int *mediatype, MEDIA_FRAME_INFO *frameinfo, char *pbuf)
{
    int ret = 0;
    unsigned int remain = 0;

    if (NULL == pObj)           return -1;

    if (NULL == pObj->pQueHeader)   return -1;
    if (NULL == pObj->pFrameinfoList)   return -1;


    WaitForSingleObject(pObj->hMutex, INFINITE);        //Lock

    if (pObj->pQueHeader->totalsize < 0)
    {
        SSQ_TRACE("pObj->pQueHeader->totalsize<0: %d\n", pObj->pQueHeader->totalsize);
        ReleaseMutex(pObj->hMutex);
        return -1;
    }

    if (pObj->pQueHeader->totalsize <= sizeof(SS_BUF_T))
    {
        ReleaseMutex(pObj->hMutex);
        return -1;
    }
    //_TRACE("读位置: %d\n", pQueHeader->readpos);



    //if (NULL != chid)     *chid = m_chid;


    //Lock();


#if 0
    ret = -1;
    for (unsigned int i=0; i<pObj->pQueHeader->maxframeno; i++)
    {
        if (pObj->pFrameinfoList[i].rtp_timestamp > frameinfo->rtptimestamp)
        {
            pObj->pQueHeader->readpos = pObj->pFrameinfoList[i].pos;
            ret = SSQ_GetDataByPosition(pObj, pObj->pFrameinfoList[i].pos, channelid, mediatype, frameinfo, pbuf);
            break;
        }
    }
#else

    if (pObj->pQueHeader->readpos == pObj->pQueHeader->bufsize)
    {
        SSQ_TRACE("重置读位置[%d / %d]..\n", pObj->pQueHeader->readpos, pObj->pQueHeader->bufsize);
        pObj->pQueHeader->readpos = 0;
    }

    if ((pObj->pQueHeader->readpos + sizeof(SS_BUF_T)) <= pObj->pQueHeader->bufsize)
    {
        SS_BUF_T *pNode = (SS_BUF_T *)(pObj->pQueData + pObj->pQueHeader->readpos);
        //if (pNode->id<1)
        if (pNode->flag != BUF_QUE_FLAG)
        {
            SSQ_TRACE("标志位错误... 缓存视频帧:%d  字节数:%d  清空队列\n", pObj->pQueHeader->videoframes, pObj->pQueHeader->totalsize);
            if (pObj->hSSHeader == NULL)    //同一个进程内使用
            {
                SSQ_Clear(pObj);
            }
            else
            {
                pObj->pQueHeader->clear_flag = 0x01;
#ifdef _WIN32
                while (pObj->pQueHeader->clear_flag!=0x00)  {Sleep(1);}
#else
                while (pObj->pQueHeader->clear_flag!=0x00)  {usleep(100);}
#endif
            }
            //Unlock();
            SSQ_TRACE("111标志位错误... 缓存视频帧:%d  字节数:%d\n", pObj->pQueHeader->videoframes, pObj->pQueHeader->totalsize);
            SSQ_TRACE("标志位错误.. 清空队列..  readpos: %d\n", pObj->pQueHeader->readpos);
            //pObj->pQueHeader->clear_flag = 0x01;

            //_TRACE("标志位错误.. 清空队列完成..\n");

            ReleaseMutex(pObj->hMutex);
            return -1;
        }


        if (NULL!=mediatype)        *mediatype = pNode->mediatype;
        if (NULL != channelid)      *channelid = pNode->channelid;


        memcpy(frameinfo, &pNode->frameinfo, sizeof(MEDIA_FRAME_INFO));
        if ( (pObj->pQueHeader->readpos + pNode->frameinfo.length+sizeof(SS_BUF_T)) <= pObj->pQueHeader->bufsize)
        {
            //从头到尾读

            if (pObj->pQueHeader->totalsize < frameinfo->length+sizeof(SS_BUF_T))
            {
                //数据量不够
                SSQ_TRACE("数据量不够... 总字节数[%d]<帧长[%d]. 读位置:%d\n", pObj->pQueHeader->totalsize, frameinfo->length+sizeof(SS_BUF_T), pObj->pQueHeader->readpos);
                ReleaseMutex(pObj->hMutex);
                return -1;
            }

            if (frameinfo->length+sizeof(SS_BUF_T) > pObj->pQueHeader->totalsize)
            {
                SSQ_TRACE("总字节数[%d]<帧长[%d]. 读位置:%d\n", pObj->pQueHeader->totalsize, frameinfo->length+sizeof(SS_BUF_T), pObj->pQueHeader->readpos);
            }

            //_TRACE("读位置00000000...: %d  /  %d\n", pQueHeader->readpos, pQueHeader->size);
            pObj->pQueHeader->readpos += sizeof(SS_BUF_T);

            unsigned int total1 = pObj->pQueHeader->totalsize;
            pObj->pQueHeader->totalsize -= sizeof(SS_BUF_T);

            if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData+pObj->pQueHeader->readpos, frameinfo->length);

            //memset(pObj->pQueData+pObj->pQueHeader->readpos, 0x00, frameinfo->length);    //clear

            pObj->pQueHeader->readpos += frameinfo->length;
            unsigned int total2 = pObj->pQueHeader->totalsize;
            pObj->pQueHeader->totalsize -= (frameinfo->length);

            if (pObj->pQueHeader->readpos == pObj->pQueHeader->bufsize)
            {
                pObj->pQueHeader->readpos = 0;
            }

            if (pObj->pQueHeader->readpos > pObj->pQueHeader->bufsize)
            {
                SSQ_TRACE("读位置错误11111...: %d  /  %d\n", pObj->pQueHeader->readpos, pObj->pQueHeader->bufsize);
            }
            if (pObj->pQueHeader->totalsize < 0)
            {
                SSQ_TRACE("读位置: %d\t写位置: %d  当前帧大小:%d   total1:%d\ttotal2:%d\ttotal3:%d\n", pObj->pQueHeader->readpos, pObj->pQueHeader->writepos, frameinfo->length, total1, total2, pObj->pQueHeader->totalsize);
                SSQ_TRACE("总字节数错误: %d\n", pObj->pQueHeader->totalsize);
            }
        }
        else
        {
            if (pObj->pQueHeader->totalsize < (pNode->frameinfo.length+sizeof(SS_BUF_T)))
            {
                SSQ_TRACE("总字节数<帧长+sizeof(SS_BUF_T)..\n");
                //Unlock();
                ReleaseMutex(pObj->hMutex);
                return -1;
            }

            remain = pObj->pQueHeader->bufsize-pObj->pQueHeader->readpos;
            if (remain>=sizeof(SS_BUF_T))
            {
                pObj->pQueHeader->readpos += sizeof(SS_BUF_T);
                remain = pObj->pQueHeader->bufsize - pObj->pQueHeader->readpos;
                if (remain>0)
                {
                    //SSQ_TRACE("111尾有部分数据... 首有部分数据... remain>0: %d\n", remain);
                    if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData+pObj->pQueHeader->readpos, remain);
                    //memset(pObj->pQueData+pObj->pQueHeader->readpos, 0x00, remain);   //clear
                    if (NULL!=pbuf) memcpy(pbuf+remain, pObj->pQueData, frameinfo->length-remain);
                    //memset(pObj->pQueData, 0x00, frameinfo->length-remain);   //clear

                    pObj->pQueHeader->readpos = frameinfo->length-remain;
                    pObj->pQueHeader->totalsize -= frameinfo->length;
                    pObj->pQueHeader->totalsize -= sizeof(SS_BUF_T);

                        if (pObj->pQueHeader->totalsize < 0)
                        {
                            SSQ_TRACE("3333pObj->pQueHeader->totalsize<0: %d\n", pObj->pQueHeader->totalsize);
                        }
                }
                else
                {
                    if (remain < 0)
                    {
                        SSQ_TRACE("位移错误: 剩余字节数<0:%d\n", remain);

                    }
                    else
                    {
                        SSQ_TRACE("111尾有部分数据... 首有部分数据... remain<=0: %d\n", remain);
                        if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData, frameinfo->length);
                        //memset(pObj->pQueData, 0x00, frameinfo->length-remain);   //clear
                        pObj->pQueHeader->readpos = frameinfo->length;
                        pObj->pQueHeader->totalsize -= frameinfo->length;
                        pObj->pQueHeader->totalsize -= sizeof(SS_BUF_T);

                        if (pObj->pQueHeader->totalsize < 0)
                        {
                            SSQ_TRACE("4444pObj->pQueHeader->totalsize<0: %d\n", pObj->pQueHeader->totalsize);
                        }
                    }
                }

                //SSQ_TRACE("remain > sizeof(SS_BUF_T): %d\t\treadpos: %d\n", remain, pObj->pQueHeader->readpos);
            }
            else
            {
                //SSQ_TRACE("remain < sizeof(SS_BUF_T): %d\n", remain);

                //执行到此处,说明异常

                //remain = pObj->pQueHeader->bufsize - pObj->pQueHeader->readpos;
                if (remain>0)
                {
                    SSQ_TRACE("222尾有部分数据... 首有部分数据... remain>0: %d\n", remain);
                    if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData+pObj->pQueHeader->readpos, remain);
                    //memset(pObj->pQueData+pObj->pQueHeader->readpos, 0x00, remain);   //clear
                    if (NULL!=pbuf) memcpy(pbuf+remain, pObj->pQueData, frameinfo->length-remain);
                    //memset(pObj->pQueData, 0x00, frameinfo->length-remain);   //clear


                    pObj->pQueHeader->readpos = frameinfo->length-remain;
                    pObj->pQueHeader->totalsize -= frameinfo->length;

                    if (pObj->pQueHeader->totalsize < 0)
                    {
                        SSQ_TRACE("555pObj->pQueHeader->totalsize<0: %d\n", pObj->pQueHeader->totalsize);
                    }

                }
                else
                {
                    SSQ_TRACE("222尾有部分数据... 首有部分数据... remain<=0: %d\n", remain);
                    if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData, frameinfo->length);
                    //memset(pObj->pQueData, 0x00, frameinfo->length-remain);   //clear
                    pObj->pQueHeader->readpos = frameinfo->length;
                    pObj->pQueHeader->totalsize -= frameinfo->length;
                    if (pObj->pQueHeader->totalsize < 0)
                    {
                        SSQ_TRACE("666pObj->pQueHeader->totalsize<0: %d\n", pObj->pQueHeader->totalsize);
                    }
                }
                pObj->pQueHeader->totalsize -= sizeof(SS_BUF_T);

                    if (pObj->pQueHeader->totalsize < 0)
                    {
                        SSQ_TRACE("777pObj->pQueHeader->totalsize<0: %d\n", pObj->pQueHeader->totalsize);
                    }
            }


            //pObj->pQueHeader->readpos += sizeof(SS_BUF_T);
            //pObj->pQueHeader->totalsize -= sizeof(SS_BUF_T);



            if (pObj->pQueHeader->readpos>pObj->pQueHeader->bufsize)
            {
                SSQ_TRACE("读位置错误...: %d  /  %d\n", pObj->pQueHeader->readpos, pObj->pQueHeader->bufsize);
            }


/*
            if (NULL!=pbuf) memcpy(pbuf, pShareMemoryBuff+pQueHeader->readpos, remain);
            memset(pShareMemoryBuff+pQueHeader->readpos, 0x00, remain); //clear
            if (NULL!=pbuf) memcpy(pbuf+remain, pShareMemoryBuff, frameinfo->length-remain);
            memset(pShareMemoryBuff, 0x00, frameinfo->length-remain);   //clear

            pQueHeader->readpos = frameinfo->length-remain;
            pQueHeader->totalsize -= (frameinfo->length-remain);
*/
        }

        if (MEDIA_TYPE_VIDEO==pNode->mediatype) pObj->pQueHeader->videoframes --;

        //memset(pNode, 0x00, sizeof(SS_BUF_T));
    }
    else
    {
        unsigned int remain = pObj->pQueHeader->bufsize-pObj->pQueHeader->readpos;
        SS_BUF_T bufnode;
        char *pp = (char *)&bufnode;
        memset(&bufnode, 0x00, sizeof(SS_BUF_T));

        //SSQ_TRACE("GET DATA...\n");

        //SSQ_TRACE("1 REMAIN: %d\n", remain);
        if (remain>0)
        {
            memcpy(pp, pObj->pQueData+pObj->pQueHeader->readpos, remain);
            //memset(pObj->pQueData+pObj->pQueHeader->readpos, 0x00, remain);   //clear
            //SSQ_TRACE("2 read: %d\n", sizeof(SS_BUF_T)-remain);
            memcpy(pp+remain, pObj->pQueData, sizeof(SS_BUF_T)-remain);
            //memset(pObj->pQueData, 0x00, sizeof(SS_BUF_T)-remain);    //clear

            memcpy(frameinfo, &bufnode.frameinfo, sizeof(MEDIA_FRAME_INFO));
            if (NULL != channelid)      *channelid = bufnode.channelid;

            //if (bufnode.id<1)
            if (bufnode.flag    != BUF_QUE_FLAG)
            {
                //Unlock();
                SSQ_Clear(pObj);
                ReleaseMutex(pObj->hMutex);
                SSQ_TRACE("SSQ_标志符错误...\n");
                return -1;
            }

            pObj->pQueHeader->readpos = sizeof(SS_BUF_T)-remain;

            if (NULL!=mediatype)    *mediatype = bufnode.mediatype;
            //SSQ_TRACE("3 frame length: %d\n", bufnode.frameinfo.length);
            if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData+pObj->pQueHeader->readpos, bufnode.frameinfo.length);
            //memset(pObj->pQueData+pObj->pQueHeader->readpos, 0x00, bufnode.frameinfo.length); //clear
            pObj->pQueHeader->readpos += bufnode.frameinfo.length;

            pObj->pQueHeader->totalsize -= sizeof(SS_BUF_T);
            //pObj->pQueHeader->totalsize -= (frameinfo->length-remain);
            pObj->pQueHeader->totalsize -= (frameinfo->length);//20140521

            if (pObj->pQueHeader->totalsize < 0)
            {
                SSQ_TRACE("888pObj->pQueHeader->totalsize<0: %d\n", pObj->pQueHeader->totalsize);
            }

            //SSQ_TRACE("GET DATA OK..\n");
            if (MEDIA_TYPE_VIDEO==bufnode.mediatype)    pObj->pQueHeader->videoframes --;
        }
        else
        {
            SSQ_TRACE("异常...   REMAIN <= 0....\n");
        }


        ret = 1000;
    }
#endif

    //Unlock();
    ReleaseMutex(pObj->hMutex);

    return ret;
}


//===========================================
//根据位置获取对应的帧数据
int     SSQ_GetDataByPosition(SS_QUEUE_OBJ_T *pObj, unsigned int position, unsigned int clearflag, unsigned int *channelid, unsigned int *mediatype, MEDIA_FRAME_INFO *frameinfo, char *pbuf)
{
    int ret = 0;
    unsigned int remain = 0;

    if (NULL == pObj)                   return -1;
    if (NULL == pObj->pQueHeader)       return -1;
    if (NULL == pObj->pFrameinfoList)   return -1;

    unsigned int *pOffset = (unsigned int *)&position;
    unsigned int totalsize = pObj->pQueHeader->totalsize;
    unsigned int *pTotalSize = (unsigned int*)&totalsize;

    if (clearflag == 0x01)
    {
        pOffset    = (unsigned int*)&pObj->pQueHeader->readpos;
        pTotalSize = (unsigned int*)&pObj->pQueHeader->totalsize;
    }

    WaitForSingleObject(pObj->hMutex, INFINITE);        //Lock

    if (*pOffset == pObj->pQueHeader->bufsize)
    {
        SSQ_TRACE("重置读位置[%d / %d]..\n", *pOffset, pObj->pQueHeader->bufsize);
        *pOffset = 0;
    }

    if (clearflag==0x01)
    {
        if (pObj->pQueHeader->totalsize <= sizeof(SS_BUF_T))
        {
            ReleaseMutex(pObj->hMutex);
            return -1;
        }


        if (pObj->pQueHeader->readpos == pObj->pQueHeader->bufsize)
        {
            pObj->pQueHeader->readpos = 0;
        }
    }

    if ((*pOffset + sizeof(SS_BUF_T)) <= pObj->pQueHeader->bufsize)
    {
        SS_BUF_T *pNode = (SS_BUF_T *)(pObj->pQueData + *pOffset);
        if (pNode->flag != BUF_QUE_FLAG)
        {
            SSQ_TRACE("[SSQ_GetDataByPosition]标志位错误...\n");
            if (clearflag == 0x01)
            {
                if (pObj->hSSHeader==NULL)  //同一进程
                {
                    SSQ_Clear(pObj);
                }
                else
                {
                    pObj->pQueHeader->clear_flag    =   0x01;
                    while (pObj->pQueHeader->clear_flag!=0x00)  {Sleep(1);}
                }
            }
            ReleaseMutex(pObj->hMutex);
            return -1;
        }

        if (NULL!=mediatype)        *mediatype = pNode->mediatype;
        if (NULL != channelid)      *channelid = pNode->channelid;


        memcpy(frameinfo, &pNode->frameinfo, sizeof(MEDIA_FRAME_INFO));
        if ( (*pOffset + pNode->frameinfo.length+sizeof(SS_BUF_T)) <= pObj->pQueHeader->bufsize)
        {
            //从头到尾读
            *pOffset += sizeof(SS_BUF_T);

            if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData+*pOffset, frameinfo->length);
            *pOffset += frameinfo->length;
            *pTotalSize -= (frameinfo->length+sizeof(SS_BUF_T));

            if (*pOffset == pObj->pQueHeader->bufsize)
            {
                *pOffset = 0;
            }

            if (*pOffset > pObj->pQueHeader->bufsize)
            {
                SSQ_TRACE("[SSQ_GetDataByPosition]读位置错误11111...: %d  /  %d\n", *pOffset, pObj->pQueHeader->bufsize);
            }
        }
        else
        {
            remain = pObj->pQueHeader->bufsize - *pOffset;
            if (remain>=sizeof(SS_BUF_T))
            {
                *pOffset += sizeof(SS_BUF_T);
                remain = pObj->pQueHeader->bufsize - *pOffset;
                if (remain>0)
                {
                    if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData + *pOffset, remain);
                    if (NULL!=pbuf) memcpy(pbuf+remain, pObj->pQueData, frameinfo->length-remain);

                    *pOffset = frameinfo->length-remain;
                    *pTotalSize -= (frameinfo->length+sizeof(SS_BUF_T));
                }
                else
                {
                    if (remain < 0)
                    {
                        SSQ_TRACE("[SSQ_GetDataByPosition]位移错误: 剩余字节数<0:%d\n", remain);
                    }
                    else
                    {
                        SSQ_TRACE("[SSQ_GetDataByPosition]尾有部分数据... 首有部分数据... remain<=0: %d\n", remain);
                        if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData, frameinfo->length);
                        //memset(pObj->pQueData, 0x00, frameinfo->length-remain);   //clear
                        *pOffset = frameinfo->length;
                        *pTotalSize -= (frameinfo->length+sizeof(SS_BUF_T));
                    }
                }
            }
            else
            {
                //SSQ_TRACE("remain < sizeof(SS_BUF_T): %d\n", remain);

                //执行到此处,说明异常
                SSQ_TRACE("[SSQ_GetDataByPosition]  异常   #########... remain>0: %d\n", remain);
                if (remain>0)
                {
                    SSQ_TRACE("[SSQ_GetDataByPosition]222尾有部分数据... 首有部分数据... remain>0: %d\n", remain);
                    if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData + *pOffset, remain);
                    if (NULL!=pbuf) memcpy(pbuf+remain, pObj->pQueData, frameinfo->length-remain);

                    *pOffset = frameinfo->length-remain;
                    *pTotalSize -= (frameinfo->length);
                }
                else
                {
                    SSQ_TRACE("[SSQ_GetDataByPosition]222尾有部分数据... 首有部分数据... remain<=0: %d\n", remain);
                    if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData, frameinfo->length);
                    //memset(pObj->pQueData, 0x00, frameinfo->length-remain);   //clear
                    *pOffset = frameinfo->length;
                }
            }

            if (*pOffset > pObj->pQueHeader->bufsize)
            {
                SSQ_TRACE("[SSQ_GetDataByPosition]读位置错误...: %d  /  %d\n", *pOffset, pObj->pQueHeader->bufsize);
            }
        }

        if (MEDIA_TYPE_VIDEO==pNode->mediatype && clearflag==0x01)  pObj->pQueHeader->videoframes --;
    }
    else
    {
        unsigned int remain = pObj->pQueHeader->bufsize - *pOffset;
        SS_BUF_T bufnode;
        char *pp = (char *)&bufnode;
        memset(&bufnode, 0x00, sizeof(SS_BUF_T));

        //SSQ_TRACE("GET DATA...\n");

        SSQ_TRACE("[SSQ_GetDataByPosition]1 REMAIN: %d\n", remain);
        if (remain>0)
        {
            memcpy(pp, pObj->pQueData + *pOffset, remain);
            SSQ_TRACE("[SSQ_GetDataByPosition]2 read: %d\n", sizeof(SS_BUF_T)-remain);
            memcpy(pp+remain, pObj->pQueData, sizeof(SS_BUF_T)-remain);

            memcpy(frameinfo, &bufnode.frameinfo, sizeof(MEDIA_FRAME_INFO));
            if (NULL != channelid)      *channelid = bufnode.channelid;

            if (bufnode.flag    != BUF_QUE_FLAG)
            {
                //Unlock();
                SSQ_Clear(pObj);
                ReleaseMutex(pObj->hMutex);
                SSQ_TRACE("[SSQ_GetDataByPosition]SSQ_标志符错误...\n");
                return -1;
            }

            *pOffset = sizeof(SS_BUF_T)-remain;

            if (NULL!=mediatype)    *mediatype = bufnode.mediatype;
            SSQ_TRACE("[SSQ_GetDataByPosition]3 frame length: %d\n", bufnode.frameinfo.length);
            if (NULL!=pbuf) memcpy(pbuf, pObj->pQueData + *pOffset, bufnode.frameinfo.length);
            *pOffset += bufnode.frameinfo.length;
            *pTotalSize -= (frameinfo->length+sizeof(SS_BUF_T));

            SSQ_TRACE("[SSQ_GetDataByPosition]GET DATA OK..\n");
            if (MEDIA_TYPE_VIDEO==bufnode.mediatype && clearflag==0x01) pObj->pQueHeader->videoframes --;
        }
        else
        {
            SSQ_TRACE("[SSQ_GetDataByPosition]异常...   REMAIN <= 0....\n");
        }

        ret = 1000;
    }

    //Unlock();
    ReleaseMutex(pObj->hMutex);

    return ret;
}


int     SSQ_TRACE(char* szFormat, ...)
{
#ifdef _DEBUG
  char buff[1024] = {0,};
  wchar_t wszbuff[1024] = {0,};
  va_list args;
  va_start(args,szFormat);
  _vsnprintf(buff, 1023, szFormat,args);
  va_end(args);

  MByteToWChar(buff, wszbuff, sizeof(wszbuff)/sizeof(wszbuff[0]));
#ifdef _WIN32
    OutputDebugString(wszbuff);
#endif
    printf("TRACE: %s", buff);
#endif

    return 0;
}