视屏编码过程分析

来源：互联网发布：犀牛软件破解码编辑：程序博客网时间：2024/04/30 05:35

图像视频子系统：

第一步：初始化系统参数并且调用回调函数，分配缓存池大小

u32BlkSize = SAMPLE_COMM_SYS_CalcPicVbBlkSize(gs_enNorm,\
enSize, SAMPLE_PIXEL_FORMAT, SAMPLE_SYS_ALIGN_WIDTH);
stVbConf.astCommPool[0].u32BlkSize = u32BlkSize;
stVbConf.astCommPool[0].u32BlkCnt = g_u32BlkCnt;

第二步：初始化系统

s32Ret = SAMPLE_COMM_SYS_Init(&stVbConf);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("system init failed with %d!\n", s32Ret);
goto END_VENC_1080P_CLASSIC_0;
}

上述函数的原型：

HI_S32 SAMPLE_COMM_SYS_Init(VB_CONF_S *pstVbConf)
{
MPP_SYS_CONF_S stSysConf = {0};
HI_S32 s32Ret = HI_FAILURE;

HI_MPI_SYS_Exit();
HI_MPI_VB_Exit();

if (NULL == pstVbConf)
{
SAMPLE_PRT("input parameter is null, it is invaild!\n");
return HI_FAILURE;
}

s32Ret = HI_MPI_VB_SetConf(pstVbConf);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("HI_MPI_VB_SetConf failed!\n");
return HI_FAILURE;
}

s32Ret = HI_MPI_VB_Init();
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("HI_MPI_VB_Init failed!\n");
return HI_FAILURE;
}

stSysConf.u32AlignWidth = SAMPLE_SYS_ALIGN_WIDTH;
s32Ret = HI_MPI_SYS_SetConf(&stSysConf);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("HI_MPI_SYS_SetConf failed\n");
return HI_FAILURE;
}

s32Ret = HI_MPI_SYS_Init();
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("HI_MPI_SYS_Init failed!\n");
return HI_FAILURE;
}

return HI_SUCCESS;
}

主要是设置VB的参数和一些系统的初始化

第三步：

设置VI。

stViConfig.enViMode = SENSOR_TYPE;
stViConfig.enRotate = ROTATE_NONE;
stViConfig.enNorm = VIDEO_ENCODING_MODE_AUTO;
stViConfig.enViChnSet = VI_CHN_SET_NORMAL;
stViConfig.enWDRMode = WDR_MODE_NONE;
s32Ret = SAMPLE_COMM_VI_StartVi(&stViConfig);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("start vi failed!\n");
goto END_VENC_1080P_CLASSIC_1;
}

第四步：

创建GROUP，设置GRP参数，启动GROUP，设置VPSS通道属性，工作模式；绑定VI和VPSS，使能 VPSS通道

s32Ret = SAMPLE_COMM_SYS_GetPicSize(gs_enNorm, enSize, &stSize);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("SAMPLE_COMM_SYS_GetPicSize failed!\n");
goto END_VENC_1080P_CLASSIC_1;
}
VpssGrp = 0;
stVpssGrpAttr.u32MaxW = stSize.u32Width;
stVpssGrpAttr.u32MaxH = stSize.u32Height;
stVpssGrpAttr.bIeEn = HI_FALSE;
stVpssGrpAttr.bNrEn = HI_TRUE;
stVpssGrpAttr.bHistEn = HI_FALSE;
stVpssGrpAttr.bDciEn = HI_FALSE;
stVpssGrpAttr.enDieMode = VPSS_DIE_MODE_NODIE;
stVpssGrpAttr.enPixFmt = PIXEL_FORMAT_YUV_SEMIPLANAR_420;

s32Ret = SAMPLE_COMM_VPSS_StartGroup(VpssGrp, &stVpssGrpAttr);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("Start Vpss failed!\n");
goto END_VENC_1080P_CLASSIC_2;
}

s32Ret = SAMPLE_COMM_VI_BindVpss(stViConfig.enViMode);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("Vi bind Vpss failed!\n");
goto END_VENC_1080P_CLASSIC_3;
}

VpssChn = 0;
stVpssChnMode.enChnMode = VPSS_CHN_MODE_USER;
stVpssChnMode.bDouble = HI_FALSE;
stVpssChnMode.enPixelFormat = PIXEL_FORMAT_YUV_SEMIPLANAR_420;
stVpssChnMode.u32Width = stSize.u32Width;
stVpssChnMode.u32Height = stSize.u32Height;
stVpssChnMode.enCompressMode = COMPRESS_MODE_SEG;
memset(&stVpssChnAttr, 0, sizeof(stVpssChnAttr));
stVpssChnAttr.s32SrcFrameRate = -1;
stVpssChnAttr.s32DstFrameRate = -1;

s32Ret = SAMPLE_COMM_VPSS_EnableChn(VpssGrp, VpssChn, &stVpssChnAttr, &stVpssChnMode, HI_NULL);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("Enable vpss chn failed!\n");
goto END_VENC_1080P_CLASSIC_4;
}

第五步：开始编码

VpssGrp = 0;
VpssChn = 0;
VencChn = 0;
s32Ret = SAMPLE_COMM_VENC_Start(VencChn, enPayLoad,\
gs_enNorm, enSize, enRcMode,u32Profile);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("Start Venc failed!\n");
goto END_VENC_1080P_CLASSIC_5;
}

s32Ret = SAMPLE_COMM_VENC_BindVpss(VencChn, VpssGrp, VpssChn);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("Start Venc failed!\n");
goto END_VENC_1080P_CLASSIC_5;
}

第六步：编码处理

s32Ret = SAMPLE_COMM_VENC_StartGetStream(s32ChnNum);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("Start Venc failed!\n");
goto END_VENC_1080P_CLASSIC_5;
}

printf("please press twice ENTER to exit this sample\n");
getchar();
getchar();

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