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Commit 191ff092 authored by Jean-Michel Trivi's avatar Jean-Michel Trivi
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Fix bug 3376700 Volume too loud at lowest setting 

Change volume attenuation curve to provide more attenuation at
 low volume settings, and finer steps at high volume.
See bug entry for link to doc with curve values.

Change-Id: I750548b2161a4c550ef982ba793156e4518119e8
parent f272ad21

services/audioflinger/AudioPolicyManagerBase.cpp

+9 −1
Original line number Diff line number Diff line
@@ -1889,7 +1889,15 @@ void AudioPolicyManagerBase::initializeVolumeCurves() { 
        mStreams[i].mVolDbAtt[StreamDescriptor::VOLMAX] = 0.0f;

    }



    // TODO add modifications for music to have finer steps below knee1 and above knee2

    // Modification for music: more attenuation for lower volumes, finer steps at high volumes

    mStreams[AudioSystem::MUSIC].mVolIndex[StreamDescriptor::VOLMIN] = 1;

    mStreams[AudioSystem::MUSIC].mVolDbAtt[StreamDescriptor::VOLMIN] = -58.0f;

    mStreams[AudioSystem::MUSIC].mVolIndex[StreamDescriptor::VOLKNEE1] = 20;

    mStreams[AudioSystem::MUSIC].mVolDbAtt[StreamDescriptor::VOLKNEE1] = -40.0f;

    mStreams[AudioSystem::MUSIC].mVolIndex[StreamDescriptor::VOLKNEE2] = 60;

    mStreams[AudioSystem::MUSIC].mVolDbAtt[StreamDescriptor::VOLKNEE2] = -17.0f;

    mStreams[AudioSystem::MUSIC].mVolIndex[StreamDescriptor::VOLMAX] = 100;

    mStreams[AudioSystem::MUSIC].mVolDbAtt[StreamDescriptor::VOLMAX] = 0.0f;

}



float AudioPolicyManagerBase::computeVolume(int stream, int index, audio_io_handle_t output, uint32_t device)