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hi3516 mpp venc snap

by · 2019年12月18日 · 697 Words · ~2min reading time | Improve on

原文链接： hi3516 mpp venc snap

get venc stream time out

一般出现这个错误一定是配置的问题，
比如 SAMPLE_COMM_IVE_StartViVpssVencVo() 中

    if (HI_TRUE == pstSwitch->bVenc)
    {
        s32Ret = SAMPLE_COMM_VENC_GetGopAttr(VENC_GOPMODE_NORMALP,&stGopAttr);
        SAMPLE_CHECK_EXPR_GOTO(HI_SUCCESS != s32Ret, END_INIT_5,
            "Error(%#x),SAMPLE_COMM_VENC_GetGopAttr failed!\n",s32Ret);
        s32Ret = SAMPLE_COMM_VENC_Start(VeH264Chn, enStreamType,aenSize[2],enRcMode,0,bRcnRefShareBuf,&stGopAttr);
        SAMPLE_CHECK_EXPR_GOTO(HI_SUCCESS != s32Ret, END_INIT_5,
            "Error(%#x),SAMPLE_COMM_VENC_Start failed!\n",s32Ret);

		// 这里默认是没有进行VPSS 绑定的，所以venc肯定要出问题，就会报 get venc stream time out 错误
        s32Ret = SAMPLE_COMM_VPSS_Bind_VENC(VpssGrp, 2,VeH264Chn);
        SAMPLE_CHECK_EXPR_GOTO(HI_SUCCESS != s32Ret, END_INIT_6,
            "Error(%#x),SAMPLE_COMM_VENC_StartGetStream failed!\n",s32Ret);

        s32Ret = SAMPLE_COMM_VENC_StartGetStream(&VeH264Chn, 1);
        SAMPLE_CHECK_EXPR_GOTO(HI_SUCCESS != s32Ret, END_INIT_6,
            "Error(%#x),SAMPLE_COMM_VENC_StartGetStream failed!\n",s32Ret);
    }

海思3518ev200芯片的sdk中没有专用的抓图接口，在特定场合下需要jpeg图片的情况下，采用将h264数据编码为图片比较麻烦，因此可以采用海思自己的JPEG编码。

不多说直接上代码：

char *pic_addr;
int VencFd, s32Ret;
INT32U maxfd = 0;
 
struct timeval TimeoutVal;
fd_set read_fds;
VENC_CHN_STAT_S stStat;
VENC_STREAM_S stStream;	
VIDEO_FRAME_INFO_S stFrame;
 
if (HI_MPI_VI_SetFrameDepth(0, 1))    //设置VI通道缓存的视频图像帧数   必须的
{
    printf("HI_MPI_VI_SetFrameDepth err, vi chn %d \n", 0);
     return -1;
}
 
usleep(90 * 1000);
 
VencFd = HI_MPI_VENC_GetFd(1);        //JPEG编码通道为1，获取通道句柄
if (VencFd < 0)
{
    printf("HI_MPI_VENC_GetFd failed with %#x!\n", VencFd);
    return -1;
}
	
maxfd = VencFd;
	
s32Ret = HI_MPI_VI_GetFrame(0, &stFrame, VIDEO_GET_FRAME_TIMEOUT);        //从VI获取一张原画
if (HI_SUCCESS != s32Ret)
{
    printf("HI_MPI_VI_GetFrame ext chn(%d) fail,Error(%#x)\n", 0 ,s32Ret);
    return -1;
}
	
s32Ret = HI_MPI_VENC_SendFrame(1, &stFrame, VIDEO_GET_FRAME_TIMEOUT);       //将VI原画发送到JPEG编码器
if (HI_SUCCESS != s32Ret)
{
    printf("HI_MPI_VENC_SendFrame ext chn(%d) fail,Error(%#x)\n", 1 ,s32Ret);
    return -1;
}
 
while(1)
{
    FD_ZERO(&read_fds);
    FD_SET(VencFd, &read_fds);
		
    TimeoutVal.tv_sec  = 0;
    TimeoutVal.tv_usec = 50 * 1000;
    s32Ret = select(maxfd + 1, &read_fds, NULL, NULL, &TimeoutVal);        //等待JPEG编码完成
    if (s32Ret < 0)
    {
        printf("select failed!\n");
        return -1;
    }
    else if (s32Ret == 0)
    {
        printf("get venc stream time out\n");
        continue;
    }
    else
    {
        if (FD_ISSET(VencFd, &read_fds))
        {
            memset(&stStream, 0, sizeof(stStream));
            s32Ret = HI_MPI_VENC_Query(1, &stStat);        //查询编码通道状态，是否创建成功
	    if (VIDEO_SUCC != s32Ret)
	    {
	        printf("HI_MPI_VENC_Query chn[%d] failed with %#x!\n", 1, s32Ret);
		return -1;
	    }
				
	    if(0 == stStat.u32CurPacks)
            {
		printf("NOTE: Current frame is NULL!\n");
		return -1;
	    }
	    stStream.pstPack = (VENC_PACK_S*)malloc(sizeof(VENC_PACK_S) * stStat.u32CurPacks);
	    if (NULL == stStream.pstPack)
	    {
		printf("malloc stream pack failed!\n");
		return -1;
	    }
			
	    stStream.u32PackCount = stStat.u32CurPacks;
	    s32Ret = HI_MPI_VENC_GetStream(1, &stStream, VIDEO_GET_FRAME_TIMEOUT);        //获取JPEG图片
	    if (VIDEO_SUCC != s32Ret)
            {
                free(stStream.pstPack);
                stStream.pstPack = NULL;
                printf("HI_MPI_VENC_GetStream failed with %#x!\n", s32Ret);
                return -1;
            }
	    else
	    {
	    	printf("\npicture data len is %d\n", stStream.pstPack->u32Len);
		pic_addr = (char *)stStream.pstPack[0].pu8Addr + stStream.pstPack[0].u32Offset;
					
		memcpy(picture_data, pic_addr, stStream.pstPack->u32Len);
		*data_len = stStream.pstPack->u32Len;
		break;
	    }
        }
    }	
free(stStream.pstPack);
HI_MPI_VI_ReleaseFrame(0, &stFrame);        //释放

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原文链接：https://blog.csdn.net/ayuedreamer/article/details/79459309

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