EasyPlayerPro-win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！

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