高通平台ISP模块触发方式和条件

更新记录：

V1 2020.10.15 记录高通平台ISP模块触发方式和条件初稿

关键字：

高通，Qualcomm，ISP trigger，触发方式等

本文内容：

1.描述

2.触发逻辑分解

3.获取照片AEC信息

4.实际的gain_start 和gain_end如何设置？

5.小结

描述：

ISP的不同的模块，其目的都不同，导致其触发方式也会根据其自身设计而调整，因此需要知晓不同的模块其触发逻辑是什么，这个逻辑是在哪里查找的，是否可以尝试去更改，

触发逻辑分解：

具体各个模组的详细的调用：可以看camx目录下：src/hwl/ispiqmodule/camxiqinterface.cpp中的IQInterface::UpdateAECGain函数中有区分：

详细代码如下：

VOID IQInterface::UpdateAECGain(
ISPIQModuleType mType,
ISPInputData* pInputData,
FLOAT gtmPercentage)
{
FLOAT gain = pInputData->triggerData.AECShortGain;
FLOAT drc_gain = pInputData->triggerData.DRCGain;

// Gain before GTM module is triggered by short gain
pInputData->triggerData.AECGain = gain;

if (mType == ISPIQModuleType::IFEGTM ||
mType == ISPIQModuleType::IFEGamma ||
mType == ISPIQModuleType::IFECST ||
mType == ISPIQModuleType::BPSGTM ||
mType == ISPIQModuleType::BPSGamma ||
mType == ISPIQModuleType::BPSCST ||
mType == ISPIQModuleType::BPSHNR ||
mType == ISPIQModuleType::IPECAC ||
mType == ISPIQModuleType::IPEICA ||
mType == ISPIQModuleType::IPEANR ||
mType == ISPIQModuleType::IPETF ||
mType == ISPIQModuleType::IPECST ||
mType == ISPIQModuleType::IPELTM ||
mType == ISPIQModuleType::IPEHNR ||
mType == ISPIQModuleType::IPELENR)
{
// Gain betweem GTM & LTM ( includes ) will be triggered by shortGain*power(DRCGain,gtm_perc)
pInputData->triggerData.AECGain = gain * static_cast<FLOAT>(CamX::Utils::Power(drc_gain, gtmPercentage));
}

if (mType == ISPIQModuleType::IPEColorCorrection ||
mType == ISPIQModuleType::IPEGamma ||
mType == ISPIQModuleType::IPE2DLUT ||
mType == ISPIQModuleType::IPEChromaEnhancement ||
mType == ISPIQModuleType::IPEChromaSuppression ||
mType == ISPIQModuleType::IPESCE ||
mType == ISPIQModuleType::IPEASF ||
mType == ISPIQModuleType::IPEUpscaler ||
mType == ISPIQModuleType::IPEGrainAdder)
{
// Gain post LTM will be triggered by shortGain*DRCGain
pInputData->triggerData.AECGain = gain * drc_gain;
}
}

分三种方式：

一、在GTM模块之前的模块，其AECGain的触发方式是short gain

pInputData->triggerData.AECGain = gain;

二、在GTM和LTM（包含）之间的模块，其AECGain的触发方式是：shortGain*power(DRCGain,gtm_perc)

pInputData->triggerData.AECGain = gain * static_cast<FLOAT>(CamX::Utils::Power(drc_gain, gtmPercentage));

三、在LTM之后的模块，其AECGain的触发方式：shortGain*DRCGain

pInputData->triggerData.AECGain = gain * drc_gain;

各个模块调试的trigger data中gain_start 和gain_end就是AECGain结果，可不是单一short gain啊；

模块	AEC gain trigger
Black level、Linearization、LSC、PDPC、ABF、GIC、Demosaic	shortgain
GTM、Gamma、CST、HNR、CAC、ICA、ANR、TF、HNR、LENR、LTM	shortGain*power(DRCGain,gtm_perc)
ColorCorrection、2DLUT、ChromaEnhancement、ChromaSuppression、SCE、ASF、Upscaler、GrainAdder	shortGain*DRCGain