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Commit e44615ff authored by Eric Laurent's avatar Eric Laurent
Browse files

Reduce THD when equalizer is ON. 

Increase headroom in LVM bundle to reduce THD when equalizer is ON
with high band gains.

Also add a workaround for a bug in headroom parameter control.

Change-Id: I1d67c9ae475f6cf852c2e0e49bacfc82a5e484fd
parent 9a150640

media/libeffects/lvm/lib/Bundle/src/LVM_Init.c

+3 −1
Original line number Diff line number Diff line
@@ -557,7 +557,9 @@ LVM_ReturnStatus_en LVM_GetInstanceHandle(LVM_Handle_t *phInstance, 
     */

    pInstance->Params.OperatingMode    = LVM_MODE_OFF;

    pInstance->Params.SampleRate       = LVM_FS_8000;

    pInstance->Params.SourceFormat     = LVM_MONO;

//  FIXME: Workaround to avoid reset of headroom parameters on first call to LVM_Process.

//    pInstance->Params.SourceFormat     = LVM_MONO;

    pInstance->Params.SourceFormat     = LVM_STEREO;

    pInstance->Params.SpeakerType      = LVM_HEADPHONES;

    pInstance->Params.VC_EffectLevel   = 0;

    pInstance->Params.VC_Balance       = 0;

media/libeffects/lvm/wrapper/Bundle/EffectBundle.cpp

+2 −2
Original line number Diff line number Diff line
@@ -698,10 +698,10 @@ int LvmBundle_init(EffectContext *pContext){ 
    /* Set the headroom parameters */

    HeadroomBandDef[0].Limit_Low          = 20;

    HeadroomBandDef[0].Limit_High         = 4999;

    HeadroomBandDef[0].Headroom_Offset    = 3;

    HeadroomBandDef[0].Headroom_Offset    = 0;

    HeadroomBandDef[1].Limit_Low          = 5000;

    HeadroomBandDef[1].Limit_High         = 24000;

    HeadroomBandDef[1].Headroom_Offset    = 4;

    HeadroomBandDef[1].Headroom_Offset    = 0;

    HeadroomParams.pHeadroomDefinition    = &HeadroomBandDef[0];

    HeadroomParams.Headroom_OperatingMode = LVM_HEADROOM_ON;

    HeadroomParams.NHeadroomBands         = 2;