Android MTK PDAF流程

PDAF：Phase Detection Auto Focus

SensorType:不同的类型主要是针对PD pixel和PD value是由sensor还是ISP处理；接触较多的Type 2 PDAF_SUPPORT_CAMSV

vendor/mediatek/proprietary/custom/mt6853/hal/pd_buf_mgr/src/pd_buf_mgr.cpp MTK
vendor/mediatek/proprietary/custom/mt6853/hal/pd_buf_mgr/src/pd_buf_mgr_open.cpp 3rd party
vendor/mediatek/proprietary/hardware/mtkcam/aaa/source/common/hal3a/v3.0/HAL3AFlowCtrl.cpp
vendor/mediatek/proprietary/hardware/mtkcam/aaa/source/common/utils/pdtblgen/pdtblgen.cpp
vendor/mediatek/proprietary/hardware/mtkcam/aaa/source/isp_6s/af_assist_mgr.cpp
vendor/mediatek/proprietary/custom/mt6853/hal/pd_buf_mgr/src/pd_buf_mgr.cpp
vendor/mediatek/proprietary/custom/mt6853/hal/pd_buf_mgr/src/pd_buf_mgr/xxx_mipi_raw/pd_xxx_mipiraw.cpp
vendor/mediatek/proprietary/hardware/mtkcam/drv/src/mem/common/v2/cam_cal_drv.cpp
vendor/mediatek/proprietary/hardware/mtkcam/drv/src/mem/common/v2/cam_cal_helper.cpp
vendor/mediatek/proprietary/custom/common/hal/imgsensor_src/camera_calibration_cam_cal.cpp
kernel-4.14/drivers/misc/mediatek/cam_cal/src/common/v2/eeprom_driver.c

static struct SET_PD_BLOCK_INFO_T imgsensor_pd_info_1920_1080 = { 
    .i4OffsetX = 16, // x offset of PD area .i4OffsetY = 12, // y offset of PD area .i4PitchX = 16, // x pitch/width of a PD block .i4PitchY = 16, // y pitch/height of a PD block .i4PairNum = 8, // num of pairs L/R PD pixel within a PD block .i4SubBlkW = 8, // x interval of 1 pair L/R PD pixel within a PD block .i4SubBlkH = 4, // y interval of 1 pair L/R PD pixel within a PD block .i4BlockNumX = 120, // PD block number in X direction .i4BlockNumY = 67, // PD block number in Y direction  .iMirrorFlip = 0, .i4PosR = { 
    { 
   16,13}, { 
   24,13}, { 
   20,17}, { 
   28,17}, { 
   16,21}, { 
   24,21}, { 
   20,25}, { 
   28,25}, }, .i4PosL = { 
    { 
   17,13}, { 
   25,13}, { 
   21,17}, { 
   29,17}, { 
   17,21}, { 
   25,21}, { 
   21,25}, { 
   29,25}, }, .i4Crop = { 
    { 
   0, 0}, { 
   0, 0}, { 
   1040, 960}, { 
   0, 0}, { 
   0, 0}, { 
   1040,960},{ 
   0, 0}, { 
   0, 0}, { 
   0, 0}, { 
   0, 0} }, }; 

vendor/mediatek/proprietary/custom/mt6853/hal/pd_buf_mgr/src/pd_buf_mgr/xxx_mipi_raw/pd_xxx_mipiraw.cpp

MBOOL PD_xxxMIPIRAW::IsSupport( SPDProfile_t &iPdProfile) { 
    if (( iPdProfile.i4SensorMode == 5) && ((iPdProfile.uImgXsz == 1920) && (iPdProfile.uImgYsz == 1080))) { 
    m_PDBufXSz = 240; m_PDBufYSz = 536; if(m_PDBuf) { 
    delete m_PDBuf; m_PDBuf = nullptr; } m_PDBufSz = m_PDBufXSz*m_PDBufYSz; m_PDBuf = new uint16_t [m_PDBufSz]; ret = MTRUE; AAA_LOGD("[1080P 60fps] is Support : i4SensorMode:%d w[%d] s[%d]\n", iPdProfile.i4SensorMode,iPdProfile.uImgXsz, iPdProfile.uImgYsz); } ... } 

{ 
   //AF_NVRAM { 
    // i4HybridAFCoefs1[64] 1, // [0] hybrid_default_param 37, // [1] tracking_width 38, // [2] tracking_height 3, // [3] max_pd_win_x 3, // [4] max_pd_win_y ... { 
   //PD_NVRAM_T { 
   //PD_CALIBRATION_DATA_T { 
   0}, 0, },//PD_CALIBRATION_DATA_T { 
   //PD_ALGO_TUNING_T //--------------------------------------------------------------------------------/ // Section: PD Block Size // Description: Determine PD block width and height // // i4FocusPDSizeX (width) // i4FocusPDSizeY (height) // range: [0] 32 to (raw_width/x_density), [0] 24 to (raw_height/y_density) // default: // S5K3P8: SizeX=32, SizeY=24 (density_x=16, density_y=16) // OV13855: SizeX=32, SizeY=48 (density_x=16, density_y=8) // IMX258: SizeX=64, SizeY=24 (density_x=8, density_y=16) // IMX398: SizeX=64, SizeY=48 (density_x=8, y_density_y=8) // S5K2L8: SizeX=240, SizeY=96 (density_x=2, y_density_y=4) // constraints: must be a multiplier of 4 // effect: A large block takes longer computation time than a small block. //--------------------------------------------------------------------------------/ 28, // i4FocusPDSizeX 32, // i4FocusPDSizeY //--------------------------------------------------------------------------------/ 

static struct SENSOR_WINSIZE_INFO_STRUCT imgsensor_winsize_info[7] = { 
    { 
   8032, 6032, 0, 12, 8032, 6008, 4016, 3004, 8, 2, 4000, 3000, 0, 0, 4000, 3000}, //preview(4000 x 3000) { 
   8032, 6032, 0, 12, 8032, 6008, 4016, 3004, 8, 2, 4000, 3000, 0, 0, 4000, 3000}, //capture(4000 x 3000) { 
   8032, 6032, 0, 12, 8032, 6008, 4016, 3004, 8, 2, 4000, 3000, 0, 0, 4000, 3000}, // VIDEO (4000 x 3000) { 
   8032, 6032, 0, 1568, 8032, 2896, 2008, 724, 364, 2, 1280, 720, 0, 0, 1280, 720}, // hight speed video (1280 x 720) { 
   8032, 6032, 0, 12, 8032, 6008, 4016, 3004, 8, 2, 4000, 3000, 0, 0, 4000, 3000}, // slim video (1280 x 720) { 
   8032, 6032, 2080, 1932, 3872, 2168, 1936, 1084, 8, 2, 1920, 1080,0, 0, 1920, 1080}, // custom1 (1920x 1080) { 
   8032, 6032, 0, 14, 8032, 6004, 8032, 6004, 16, 2, 8000, 6000, 0, 0, 8000, 6000}, //remosaic (8000 x 6000) }; 

static struct SENSOR_VC_INFO_STRUCT SENSOR_VC_INFO[4]= { 
    /* Preview mode setting */ { 
   0x02, //VC_Num 0x0a, //VC_PixelNum 0x00, //ModeSelect /* 0:auto 1:direct */ 0x00, //EXPO_Ratio /* 1/1, 1/2, 1/4, 1/8 */ 0x00, //0DValue /* 0D Value */ 0x00, //RG_STATSMODE /* STATS divistion mode 0:16x16 1:8x8 2:4x4 3:1x1 */ 0x00, 0x2B, 0x0FA0, 0x0BB8, // VC0 image data 0x00, 0x00, 0x0000, 0x0000, // VC1 MVHDR 0x01, 0x30, 0x026C, 0x05D0, // VC2 PDAF 0x00, 0x00, 0x0000, 0x0000}, // VC3  /* Capture mode setting */ /* Video mode setting */ /* Custom1 mode setting */ { 
   0x02, //VC_Num 0x0a, //VC_PixelNum 0x00, //ModeSelect /* 0:auto 1:direct */ 0x00, //EXPO_Ratio /* 1/1, 1/2, 1/4, 1/8 */ 0x00, //0DValue /* 0D Value */ 0x00, //RG_STATSMODE /* STATS divistion mode 0:16x16 1:8x8 2:4x4 3:1x1 */ 0x00, 0x2B, 0x0780, 0x0438, // VC0 image data 0x00, 0x00, 0x0000, 0x0000, // VC1 MVHDR 0x01, 0x30, 0x012C, 0x0218, // VC2 PDAF 0x00, 0x00, 0x0000, 0x0000}, // VC3  };}; 

插入一下OTP相关的知识

LCS Lens Shade Correction gridx gridy 垂直和网格大小，周围亮度不均匀，处理不好可能经算法会有竖条纹，光晕等 BLC BlackLevel Correction 黑电平校正 (没有做黑电平校正的的图会更亮，影响图像的对比度) sensor输出的电压越高，电流越大，而sensor电路本算存在暗电流，导致没有光线输入时也 有一定的输出电压，所以需要把这一部分去掉,所有像素都减去一个校准值,raw10对应的OB (Optical Black)一般为64,需要注意init setting中的寄存器修改 AWB Auto White Balance RGB转成Bayer模式的图一般由(R Gr Gb B四个通道的值) ,AWB一般比较关注R/G B/G的值， Gr Gb一般值都比较接近，R/G 变大时，意味着R gain减小，整幅图R分量少了，就会呈现泛绿泛蓝, 烧录的数据主要是当前模组和Golden模组(一批生产中较为平均的做基准)的R Gr Gb B的数据