typedef struct hiVENC_ATTR_H264_CBR_S
{
HI_U32 u32Gop;
HI_U32 u32StatTime;
HI_U32 u32ViFrmRate;
HI_FR32 fr32TargetFrmRate;
HI_U32 u32BitRate;
HI_U32 u32FluctuateLevel;
} VENC_ATTR_H264_CBR_S;
u32BitRate 平均bitrate，以kbps 为单位。
取值范围：[2, 40960]。
HI_S32 SAMPLE_COMM_VENC_Start(VENC_GRP VencGrp,VENC_CHN VencChn, PAYLOAD_TYPE_E enType, VIDEO_NORM_E enNorm, PIC_SIZE_E enSize, SAMPLE_RC_E enRcMode)
{
HI_S32 s32Ret;
VENC_CHN_ATTR_S stVencChnAttr;
VENC_ATTR_H264_S stH264Attr;
VENC_ATTR_H264_CBR_S stH264Cbr;
VENC_ATTR_H264_VBR_S stH264Vbr;
VENC_ATTR_H264_FIXQP_S stH264FixQp;
VENC_ATTR_MJPEG_S stMjpegAttr;
VENC_ATTR_MJPEG_FIXQP_S stMjpegeFixQp;
VENC_ATTR_JPEG_S stJpegAttr;
SIZE_S stPicSize;
s32Ret = SAMPLE_COMM_SYS_GetPicSize(enNorm, enSize, &stPicSize);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("Get picture size failed!\n");
return HI_FAILURE;
}
/******************************************
step 1: Greate Venc Group
******************************************/
s32Ret = HI_MPI_VENC_CreateGroup(VencGrp);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT("HI_MPI_VENC_CreateGroup[%d] failed with %#x!\n",\
VencGrp, s32Ret);
return HI_FAILURE;
}
/******************************************
step 2: Create Venc Channel
******************************************/
stVencChnAttr.stVeAttr.enType = enType;
switch(enType)
{
case PT_H264:
{
stH264Attr.u32MaxPicWidth = stPicSize.u32Width;
stH264Attr.u32MaxPicHeight = stPicSize.u32Height;
stH264Attr.u32PicWidth = stPicSize.u32Width;/*the picture width*/
stH264Attr.u32PicHeight = stPicSize.u32Height;/*the picture height*/
stH264Attr.u32BufSize = stPicSize.u32Width * stPicSize.u32Height * 2;/*stream buffer size*/
stH264Attr.u32Profile = 0;/*0: baseline; 1:MP; 2:HP ? */
stH264Attr.bByFrame = HI_TRUE;/*get stream mode is slice mode or frame mode?*/
stH264Attr.bField = HI_FALSE; /* surpport frame code only for hi3516, bfield = HI_FALSE */
stH264Attr.bMainStream = HI_TRUE; /* surpport main stream only for hi3516, bMainStream = HI_TRUE */
stH264Attr.u32Priority = 0; /*channels precedence level. invalidate for hi3516*/
stH264Attr.bVIField = HI_FALSE;/*the sign of the VI picture is field or frame. Invalidate for hi3516*/
memcpy(&stVencChnAttr.stVeAttr.stAttrH264e, &stH264Attr, sizeof(VENC_ATTR_H264_S));
if(SAMPLE_RC_CBR == enRcMode)
{
stVencChnAttr.stRcAttr.enRcMode = VENC_RC_MODE_H264CBR;
stH264Cbr.u32Gop = (VIDEO_ENCODING_MODE_PAL== enNorm)?25:30;
stH264Cbr.u32StatTime = 1; /* stream rate statics time(s) */
stH264Cbr.u32ViFrmRate = (VIDEO_ENCODING_MODE_PAL== enNorm)?25:30;/* input (vi) frame rate */
stH264Cbr.fr32TargetFrmRate = (VIDEO_ENCODING_MODE_PAL== enNorm)?25:30;/* target frame rate */
switch (enSize)
{
case PIC_QCIF:
stH264Cbr.u32BitRate = 256; /* average bit rate */
break;
case PIC_QVGA: /* 320 * 240 */
case PIC_CIF:
stH264Cbr.u32BitRate = 512;
break;
case PIC_D1:
case PIC_VGA: /* 640 * 480 */
stH264Cbr.u32BitRate = 1024*2;
break;
case PIC_HD720: /* 1280 * 720 */
stH264Cbr.u32BitRate = 1024*3;
break;
case PIC_HD1080: /* 1920 * 1080 */
stH264Cbr.u32BitRate = 1024*6;
break;
default :
stH264Cbr.u32BitRate = 1024*4;
break;
}