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; }