Change Device Volume

[shah...@essential.com]

Hi,

I have  a native ndk audio library that needs to change device volume (as if pressing hardware buttons). The below code returns SL_RESULT_FEATURE_UNSUPPORTED.

I can't get the device volume interface (SLDeviceVolumeItf).

  SLDeviceVolumeItf bqPlayerDeviceVolume = NULL;

    SLInterfaceID ids[4] = {SL_IID_BUFFERQUEUE, SL_IID_VOLUME, SL_IID_DEVICEVOLUME};

    SLboolean req[4] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE };

    ....

    SLresult result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_DEVICEVOLUME, &bqPlayerDeviceVolume);

SL_IID_VOLUME interface can change the volume, but can't raise the volume more than what the hardware button has set that to.

Any idea how to do this?

Regards, Shahriar

[Glenn Kasten]

See section "Objects and interfaces" of OpenSL ES for Android.

Summary is that SL_IID_DEVICEVOLUME is not supported on Android.