EasyPlayerPro Windows播放器实时流进行本地缓冲区即时回放功能实现

背景描述

参照国内视频监控行业监控软件，实现当前视频的即时回放功能，例如: 监控人员发现刚刚的某个视频点有可疑，就像录像回放一样，想倒回去看一下，但又不想切换到录像回放界面, 此处就体现即时回放的价值了，还可将回放片断保存为录像文件;

实现流程

• 在视频播放时, 将收到的帧数据写入待解码播放队列;
• 当用户切换到即时回放功能, 则停止解码当前的帧;
• 在解码线程中修改用者ID(涉及到缓冲队列的设计);
• 解码线程一直读取历史队列中的帧进行解码显示;
• 当读到队列的最后一帧时，再从头开始循环;

代码实现

//即时回放处理: 将当前正在播放的缓冲队列中的数据，拷贝到即时回放队列, 然后从即时回放队列中读取数据进行回放
int ChannelManager::InstantReplayProcess(MEDIA_VIDEO_CHANNEL_OBJ_T *pMediaChannel, CONSUMER_HANDLE *handle,
                    BUFFER_TYPE_ENUM *bufferType, int *headerSize, char *headerData, int *payloadSize, char *payloadData)
{
if (NULL == pMediaChannel)      return -1;

int     ret = -1;
CONSUMER_HANDLE consumerHandle = *handle;

if (NULL == pMediaChannel->pInstantReplay)      return -1;

if ( pMediaChannel->pInstantReplay->instantReplay == 0x01 )
{
    if (NULL == pMediaChannel->pInstantReplay->bufQueueHandle)      //创建即时回放缓冲队列
    {
        //创建即时回放缓冲区
        int queueSize = pMediaChannel->pSourcePtr->GetQueueSize();
        BUFQUE_Create(&pMediaChannel->pInstantReplay->bufQueueHandle, 0, NULL, queueSize, MAX_PRE_RECORDING_SECS, 0, 1);

        //此处将sourcePtr中的bufqueue拷贝到 即时回放中的缓冲区
        CONSUMER_HANDLE consumerHandleInstantReplay = BUFQUE_RegisterConsumer(pMediaChannel->pInstantReplay->bufQueueHandle,
                                                                                (unsigned int)pMediaChannel, 0x00);
        if (NULL == consumerHandleInstantReplay)
        {
            _TRACE(TRACE_LOG_DEBUG, "channel[%d]注册即时回放调用者失败.\n", pMediaChannel->id);

            BUFQUE_Release(&pMediaChannel->pInstantReplay->bufQueueHandle);
            return ret;
        }
        *handle = consumerHandleInstantReplay;
        consumerHandle = consumerHandleInstantReplay;
        pMediaChannel->pInstantReplay->consumerHandle = BUFQUE_RegisterConsumer(pMediaChannel->pInstantReplay->bufQueueHandle,
                                                                            (unsigned int)pMediaChannel->pInstantReplay,
                                                                            0x00);  //再注册一个，用于和consumerHandleInstantReplay循环使用

        pMediaChannel->pInstantReplay->frameNum = 0;
        pMediaChannel->pInstantReplay->frameNo  = 0;

        BUFFER_TYPE_ENUM    bufferType = BUFFER_TYPE_UNKNOWN;
        CONSUMER_HANDLE     consumerHandleTmp = NULL;
        consumerHandleTmp = pMediaChannel->pSourcePtr->RegisterConsumer((unsigned int)&pMediaChannel->pInstantReplay, 0x01);

        //从当前正在播放的缓冲队列中，拷贝数据到即时回放队列
        if (NULL != consumerHandleTmp)
        {
            int     headerSize = 0;
            EASY_FRAME_INFO     tmpFrameInfo;
            memset(&tmpFrameInfo, 0x00, sizeof(EASY_FRAME_INFO));

            BUFF_T      buffSource;
            memset(&buffSource, 0x00, sizeof(BUFF_T));
            BUFF_MALLOC(&buffSource, MAX_ENCODE_FRAME_SIZE);            //最大编码帧大小为MAX_ENCODE_FRAME_SIZE(1024*1024)

            int     writeKeyFrame = 0x00;
            int     bufferId = 0;
            do
            {
                //从队列中获取音视频和事件数据
                bufferType = BUFFER_TYPE_UNKNOWN;
                if (0 != pMediaChannel->pSourcePtr->GetSourceData(consumerHandleTmp, NULL, &bufferType,
                                            &headerSize, (char *)&tmpFrameInfo, &buffSource.bufpos, buffSource.pbuf, 0x01))
                {
                    break;
                }

                //保证第一帧为视频关键帧
                if (writeKeyFrame == 0x01 || ( BUFFER_TYPE_VIDEO == bufferType && tmpFrameInfo.type == FRAME_TYPE_I) )
                {
                    BUFQUE_AddData(pMediaChannel->pInstantReplay->bufQueueHandle, ++bufferId, bufferType, headerSize, (char *)&tmpFrameInfo, buffSource.bufpos, buffSource.pbuf);
                    writeKeyFrame = 0x01;

                    pMediaChannel->pInstantReplay->frameNum ++;
                    //pMediaChannel->pInstantReplay->frameNo = 0;
                }
            }while (1);
            BUFF_FREE(&buffSource);

            pMediaChannel->pSourcePtr->UnRegisterConsumer(&consumerHandleTmp);
        }
    }

    //当前对即时回放队列进行录像
    if (pMediaChannel->pInstantReplay->recording == 0x01)
    {
        pMediaChannel->pInstantReplay->recording = 0x00;
        InstantReplayRecording(pMediaChannel);              //即时回放录像
    }

    if (pMediaChannel->pInstantReplay->status==PLAY_SPEED_PAUSED)
    {
        if (pMediaChannel->pInstantReplay->instantReplay == 0x00)       //暂停状态时, 上层已调用关闭即时回放
        {
            if (NULL != pMediaChannel->pInstantReplay->bufQueueHandle)
            {
                if (NULL != consumerHandle)
                {
                    BUFQUE_UnRegisterConsumer(pMediaChannel->pInstantReplay->bufQueueHandle, &consumerHandle);
                    *handle = NULL;
                }
                if (NULL != pMediaChannel->pInstantReplay->consumerHandle)
                {
                    BUFQUE_UnRegisterConsumer(pMediaChannel->pInstantReplay->bufQueueHandle, &pMediaChannel->pInstantReplay->consumerHandle);
                }
                BUFQUE_Release(&pMediaChannel->pInstantReplay->bufQueueHandle);
            }

            delete pMediaChannel->pInstantReplay;
            pMediaChannel->pInstantReplay = NULL;
        }

        return 0;
    }

    ret = BUFQUE_GetData(pMediaChannel->pInstantReplay->bufQueueHandle, consumerHandle, NULL, bufferType, headerSize, headerData, payloadSize, payloadData, 0x01);
    if (ret < 0)
    {
        BUFQUE_CopyConsumer(pMediaChannel->pInstantReplay->bufQueueHandle, consumerHandle, pMediaChannel->pInstantReplay->consumerHandle);
        ret = BUFQUE_GetData(pMediaChannel->pInstantReplay->bufQueueHandle, consumerHandle, NULL, bufferType, headerSize, headerData, payloadSize, payloadData, 0x01);
        if (ret == 0x00)            pMediaChannel->pInstantReplay->frameNo = 1;
        else                pMediaChannel->pInstantReplay->frameNo = 0;
    }
    else if (ret == 0 && *bufferType==BUFFER_TYPE_VIDEO)
    {
        pMediaChannel->pInstantReplay->frameNo ++;
    }
}
else if (pMediaChannel->pInstantReplay->instantReplay == 0x00)      //关闭即时回放
{
    if (NULL != pMediaChannel->pInstantReplay->bufQueueHandle)
    {
        if (NULL != consumerHandle)
        {
            BUFQUE_UnRegisterConsumer(pMediaChannel->pInstantReplay->bufQueueHandle, &consumerHandle);
            *handle = NULL;
        }
        if (NULL != pMediaChannel->pInstantReplay->consumerHandle)
        {
            BUFQUE_UnRegisterConsumer(pMediaChannel->pInstantReplay->bufQueueHandle, &pMediaChannel->pInstantReplay->consumerHandle);
        }
        BUFQUE_Release(&pMediaChannel->pInstantReplay->bufQueueHandle);
    }

    delete pMediaChannel->pInstantReplay;
    pMediaChannel->pInstantReplay = NULL;
    ret = 100;
}

return ret;
}

关于EasyPlayerPro

EasyPlayerPro是一款全功能的流媒体播放器，支持RTSP、RTMP、HTTP、HLS、UDP、RTP、File等多种流媒体协议播放、支持本地文件播放，支持本地抓拍、本地录像、播放旋转、多屏播放、倍数播放等多种功能特性，核心基于ffmpeg，稳定、高效、可靠、可控，支持Windows、Android、iOS三个平台，目前在多家教育、安防、行业型公司，都得到的应用，广受好评！

EasyPlayerPro：https://github.com/EasyDSS/EasyPlayerPro

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