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.
", 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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