MTK Audio Tuning Tool set Normal Recond Volume Invaild
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问题根本因:
mtk音频调试工具在设置普通录音音量后,只是将音量参数设置到ram中没有设置到对应的
寄存器中。
解决方案:
a.工具上设置音频参数后,adb中执行命令 adb shell AudioSetParam UpdateMicGain=1
b.需要mtk修改音频调试工具;
分析过程:
开启录音应用时设置 Mic gain 过程:由 SetCaptureGain 函数调用ApplyMicGain 最终将mic参数设置到register中
函数调用流程:SetCaptureGain() --->ApplyMicGain(),log如下:
15:36:11.169255 751 28084 D AudioALSAVolumeController: +SetCaptureGain(), mode=0, source=1, input device=0x80000004, output device=0x2 //mode=0 表示为Idle_Normal_Record 模式。
15:36:11.169305 751 28084 D AudioYusuParam: QueryFeatureSupportInfo(),feature support 2290045
15:36:11.169363 751 28084 D AudioALSAVolumeController: ApplyMicGain MicType = 0 DegradedBGain = 12 SwAgcGain = 16, mULTotalGain = 192//MicType = 0Idle_Normal_Record
15:36:11.169412 751 28084 D AudioALSAVolumeController: ApplyMicGain mSwAgcGain = 16, mULTotalGain=192 DegradedBGain = 12
通过工具调试录音模式音频参数调用流程如下:通
设置mic gain值到ram后没有调用ApplyMicGain 设置mic gain到register。
如下调用流程:通过工具设置volume为255后,调用initVolumeController函数从Nvran中获取工具写入的音频参数放到mVolumeParam.audiovolume_mic[VOLUME_NORMAL_MODE][4]然后更新到对应的模式变量中mULTotalGainTable[mode]、mMicGain[Mode] 。然后通过setparamters接口更新参数到对应的寄存器中,但是没有调用“UpdateMicGain=1” 导致录音mic参数不生效。
15:36:37.892043 751 1280 D AudioALSAVolumeController: mVolumeParam.audiovolume_mic[VOLUME_NORMAL_MODE][4] = 255 // 通过工具设置volume参数为255
.....
15:36:37.899049 751 1280 D AudioALSAVolumeController: Volume = 252 UPLINK_GAIN_MAX DegradedB = 0.000000
15:36:37.899096 751 1280 D AudioALSAVolumeController: SetULTotalGain MicMode=0, Volume=252 //代码中判断volume不能大于252,若大于252则等于252
15:36:37.899141 751 1280 D AudioALSAVolumeController: SetMicGain MicMode=0, Gain=0
15:36:38.172890 751 2299 D AudioALSAHardware: +setParameters(): UpdateBesRecordParameters=1
15:36:38.405347 751 1280 D AudioALSAHardware: +setParameters(): UpdateBesRecordParameters=1
15:36:38.689454 751 751 D AudioALSAHardware: +setParameters(): UpdateBesRecordParameters=1
15:36:38.869964 751 2609 D AudioALSAHardware: +setParameters(): UpdateBesRec
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