在hi3516dv300开发板上把rgb格式的ive图像转为yuv视频帧

如题，论坛里和csdn里已经有不少关于yuv视频帧转rgb图像的方法了，然而并没有能将ive图像反过来转为yuv视频帧的办法。
自己尝试着写了一个api，结果报了个莫名奇妙的错。

代码如下所示：

HI_S32 rgb2yuvFrame(IPC_IMAGE *srcImage, VIDEO_FRAME_INFO_S *dstFrame)
{
    IVE_HANDLE hIveHandle;
    IVE_SRC_IMAGE_S pstSrc;
    IVE_DST_IMAGE_S pstDst;
    IVE_CSC_CTRL_S stCscCtrl;
    HI_S32 s32Ret = 0;
    stCscCtrl.enMode = IVE_CSC_MODE_PIC_BT709_RGB2YUV;
    pstSrc.enType = IVE_IMAGE_TYPE_U8C3_PACKAGE;
    pstSrc.u32Width = srcImage->u32Width;
    pstSrc.u32Height = srcImage->u32Height;
    pstSrc.au64PhyAddr[0] = srcImage->u64PhyAddr;
    pstSrc.au64PhyAddr[1] = 0;
    pstSrc.au64PhyAddr[2] = 0;
    pstSrc.au64VirAddr[0] = srcImage->u64VirAddr;
    pstSrc.au64VirAddr[1] = 0;
    pstSrc.au64VirAddr[2] = 0;
    pstSrc.au32Stride[0] = 1280;
    pstSrc.au32Stride[1] = 0;
    pstSrc.au32Stride[2] = 0;

    pstDst.enType = IVE_IMAGE_TYPE_YUV420SP;
    pstDst.u32Width = pstSrc.u32Width;
    pstDst.u32Height = pstSrc.u32Height;

    s32Ret = HI_MPI_SYS_MmzAlloc_Cached(&pstDst.au64PhyAddr[0], (void **)&pstDst.au64VirAddr[0],
                                        "User", HI_NULL, pstDst.u32Height * pstSrc.au32Stride[0] * 3);
    if (HI_SUCCESS != s32Ret)
    {
        HI_MPI_SYS_MmzFree(pstDst.au64PhyAddr[0], (void *)pstDst.au64VirAddr[0]);
        SAMPLE_PRT("HI_MPI_SYS_MmzFree err\n");
        return s32Ret;
    }
    s32Ret = HI_MPI_SYS_MmzFlushCache(pstDst.au64PhyAddr[0], (void *)pstDst.au64VirAddr[0],
                                      pstDst.u32Height * pstSrc.au32Stride[0] * 3);
    if (HI_SUCCESS != s32Ret)
    {
        HI_MPI_SYS_MmzFree(pstDst.au64PhyAddr[0], (void *)pstDst.au64VirAddr[0]);
        SAMPLE_PRT("HI_MPI_SYS_MmzFree err\n");
        return s32Ret;
    }
    memset((void *)pstDst.au64VirAddr[0], 0, pstDst.u32Height * pstSrc.au32Stride[0] * 3);
    HI_BOOL bInstant = HI_TRUE;
    s32Ret = HI_MPI_IVE_CSC(&hIveHandle, &pstSrc, &pstDst, &stCscCtrl, bInstant);
    if (HI_SUCCESS != s32Ret)
    {
        HI_MPI_SYS_MmzFree(pstDst.au64PhyAddr[0], (void *)pstDst.au64VirAddr[0]);
        return s32Ret;
    }
    if (HI_TRUE == bInstant)
    {
        HI_BOOL bFinish = HI_TRUE;
        HI_BOOL bBlock = HI_TRUE;
        s32Ret = HI_MPI_IVE_Query(hIveHandle, &bFinish, bBlock);
        while (HI_ERR_IVE_QUERY_TIMEOUT == s32Ret)
        {
            usleep(100);
            s32Ret = HI_MPI_IVE_Query(hIveHandle, &bFinish, bBlock);
        }
    }
    dstFrame->stVFrame.u64VirAddr[0] = pstDst.au64VirAddr[0];
    dstFrame->stVFrame.u64VirAddr[1] = pstDst.au64VirAddr[1];
    dstFrame->stVFrame.u64VirAddr[2] = pstDst.au64VirAddr[2];

    dstFrame->stVFrame.u64PhyAddr[0] = pstDst.au64PhyAddr[0];
    dstFrame->stVFrame.u64PhyAddr[1] = pstDst.au64PhyAddr[1];
    dstFrame->stVFrame.u64PhyAddr[2] = pstDst.au64PhyAddr[2];

    dstFrame->stVFrame.u32Stride[0] = pstDst.au32Stride[0];
    dstFrame->stVFrame.u32Stride[1] = pstDst.au32Stride[1];
    dstFrame->stVFrame.u32Stride[2] = pstDst.au32Stride[2];
    return HI_SUCCESS;
}

SDK的版本号是spc020，希望哪位大神能可怜一下我这个学生党吧，急！