MT6592 audio笔记

1.模拟增益的设置

在Audio_ver1_volume_custom_default.h中

#define VER1_AUD_NORMAL_VOLUME_DEFAULT \
    128,128,128,128,128,128


#define VER1_AUD_HEADSER_VOLUME_DEFAULT \
    124,148,148,148,148,148


#define VER1_AUD_SPEAKER_VOLUME_DEFAULT \
    160,120,120,120,120,120


#define VER1_AUD_HEADSETSPEAKER_VOLUME_DEFAULT \
    112,160,132,132,132,132,132,132


#define VER1_AUD_EXTAMP_VOLUME_DEFAULT \
    132,132,132,132,132,132

这部分代码是模拟增益的设置，即在工程模式下Max Vol对应的值

AudioResourceManager::TurnonAudioDevice->mAudioVolumeInstance->setMasterVolume(mAudioVolumeInstance->getMasterVolume(), mAudioMode, mDlOutputDevice);-->AudioMTKVolumeController::setMasterVolume()-->AudioMTKVolumeController::ApplyAudioGain()-->AudioAnalogControl::SetAnalogGain()-->AudioMachineDevice::SetAnalogGain()

2.数字增益的设置

在Audio_ver1_volume_custom_default.h中

#define VER1_AUD_VOLUME_RING \
    32,48,64,80,96,112,128,144,160,176,192,208,224,240,255,\
    32,48,64,80,96,112,128,144,160,176,192,208,224,240,255,\
    128,136,144,152,160,168,176,184,192,200,212,224,236,248,255,\
    128,136,144,152,160,168,176,184,192,200,212,224,236,248,255


#define VER1_AUD_VOLUME_SIP \
    112,136,160,184,208,232,255,0,0,0,0,0,0,0,0,\
    112,136,160,184,208,232,255,0,0,0,0,0,0,0,0,\
    112,136,160,184,208,232,255,0,0,0,0,0,0,0,0,\
    0,43,85,128,171,213,255,0,0,0,0,0,0,0,0

。。。

是数字增益的设置，工程模式中的value level对应

AudioMTKPolicyManager::computeCustomVolume()