Is it possible to set volume greater than 1.0f (amplification)

[devnullpointer]

Issue description

Is it possible to set the volume in exoplayer to a value greater than 1.0f to create an "amplification" effect for videos that have been recorded with low audio levels?

Reproduction steps

1. add a seekbar in the overriden exo_playback_control_view
2. add the following onseekbarchangelistener in the player activity

seekBar.setMax(200);
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener()
        {
            @Override
            public void onProgressChanged(final SeekBar seekBar, final int progress, final boolean fromUser)
            {
                final float adjust = (float) progress / 100;
                Log.d(TAG, "Volume: " + adjust);
                player.setVolume(adjust);
            }

            @Override
            public void onStartTrackingTouch(final SeekBar seekBar)
            {
            }

            @Override
            public void onStopTrackingTouch(final SeekBar seekBar)
            {
            }
        });

Any volume level greater than 1.0f has no audio effect, lower than 1.0 will reduce the volume.

Version of ExoPlayer being used

2.6.0

Device(s) and version(s) of Android being used

Android KitKat 4.4

[andrewlewis]

It should be possible to implement this kind of postprocessing via a custom AudioProcessor. Marking as an enhancement for now, but it's unlikely we will get round to it soon. Feel free to send a PR.

[andrewlewis]

Marking as a duplicate of #2659 as that is also a request for a volume controlling AudioProcessor.