1 /* 2 * sensor_descriptor.h - sensor descriptor 3 * 4 * Copyright (c) 2015 Intel Corporation 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 * 18 * Author: Wind Yuan <feng.yuan (at) intel.com> 19 */ 20 21 #include "sensor_descriptor.h" 22 #include <math.h> 23 24 namespace XCam { 25 26 SensorDescriptor::SensorDescriptor () 27 { 28 xcam_mem_clear (_sensor_data); 29 } 30 31 SensorDescriptor::~SensorDescriptor () 32 { 33 } 34 35 bool 36 SensorDescriptor::is_ready () 37 { 38 return (_sensor_data.line_length_pck > 0); 39 } 40 41 void 42 SensorDescriptor::set_sensor_data (struct atomisp_sensor_mode_data &data) 43 { 44 _sensor_data = data; 45 } 46 47 bool 48 SensorDescriptor::exposure_time_to_integration ( 49 int32_t exposure_time, uint32_t &coarse_time, uint32_t &fine_time) 50 { 51 if (exposure_time < 0 || !is_ready ()) 52 return false; 53 54 uint32_t pixel_periods = ((uint64_t)exposure_time) * _sensor_data.vt_pix_clk_freq_mhz / XCAM_SECONDS_2_TIMESTAMP (1); 55 56 coarse_time = pixel_periods / _sensor_data.line_length_pck; 57 fine_time = pixel_periods % _sensor_data.line_length_pck; 58 return true; 59 } 60 61 bool 62 SensorDescriptor::exposure_integration_to_time ( 63 uint32_t coarse_time, uint32_t fine_time, int32_t &exposure_time) 64 { 65 if (!is_ready ()) 66 return false; 67 68 uint64_t pixel_periods = coarse_time * _sensor_data.line_length_pck + fine_time; 69 exposure_time = pixel_periods * XCAM_SECONDS_2_TIMESTAMP(1) / _sensor_data.vt_pix_clk_freq_mhz; 70 return true; 71 } 72 73 bool 74 SensorDescriptor::exposure_gain_to_code ( 75 double analog_gain, double digital_gain, 76 int32_t &analog_code, int32_t &digital_code) 77 { 78 XCAM_ASSERT (digital_gain == 1.0); 79 double db = log10 (analog_gain * digital_gain) * 20; 80 if (db > 48) 81 db = 48; 82 analog_code = (uint32_t) (db * 160.0 / 48); 83 digital_code = 0; 84 return true; 85 } 86 87 bool 88 SensorDescriptor::exposure_code_to_gain ( 89 int32_t analog_code, int32_t digital_code, 90 double &analog_gain, double &digital_gain) 91 { 92 XCAM_UNUSED (digital_code); 93 double db = analog_code * 48.0 / 160.0; 94 analog_gain = pow (10.0, db / 20.0); 95 digital_gain = 1.0; 96 97 return true; 98 } 99 100 }; 101
