JUCE/modules/juce_audio_plugin_client/VST/juce_VSTCallbackHandler.h

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3

   Details of these licenses can be found at: www.gnu.org/licenses

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

   -----------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.

  ==============================================================================
*/

#pragma once

/** An interface to allow an AudioProcessor to receive VST specific calls from
    the host.
*/
struct VSTCallbackHandler
{
    virtual ~VSTCallbackHandler() {}

    /** This is called by the VST plug-in wrapper when it receives unhandled
        vendor specific calls from the host.
    */
    virtual pointer_sized_int handleVstManufacturerSpecific (int32 index,
                                                             pointer_sized_int value,
                                                             void* ptr,
                                                             float opt) = 0;
};