/*
    Copyright (C) 2004

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: session_vst.cc,v 1.5 2004/07/28 17:43:57 pauld Exp $
*/

#include <stdbool.h>
#include <cstdio>

#include <fst.h>
#include <vst/aeffectx.h>

#include <ardour/session.h>
#include <ardour/vst_plugin.h>

#include "i18n.h"

// #define DEBUG_CALLBACKS

#ifdef DEBUG_CALLBACKS
#define SHOW_CALLBACK printf
#else
#define SHOW_CALLBACK(...)
#endif

using namespace ARDOUR;

long Session::vst_callback (AEffect* effect,
			    long opcode,
			    long index,
			    long value,
			    void* ptr,
			    float opt)
{
	static VstTimeInfo _timeInfo;
	VSTPlugin* plug;
	Session* session;

	SHOW_CALLBACK ("am callback, opcode = %d", opcode);
	
	if (effect && effect->user) {
		plug = static_cast<VSTPlugin*> (effect->user);
		session = &plug->session();
	} else {
		plug = 0;
		session = 0;
	}

	switch(opcode){

	case audioMasterAutomate:
		SHOW_CALLBACK ("amc: audioMasterAutomate\n");
		// index, value, returns 0
		if (effect) {
			effect->setParameter (effect, index, opt);
		}
		return 0;

	case audioMasterVersion:
		SHOW_CALLBACK ("amc: audioMasterVersion\n");
		// vst version, currently 2 (0 for older)
		return 2;

	case audioMasterCurrentId:	
		SHOW_CALLBACK ("amc: audioMasterCurrentId\n");
		// returns the unique id of a plug that's currently
		// loading
		return 0;
		
	case audioMasterIdle:
		SHOW_CALLBACK ("amc: audioMasterIdle\n");
		// call application idle routine (this will
		// call effEditIdle for all open editors too) 
		if (effect) {
			effect->dispatcher(effect, effEditIdle, 0, 0, NULL, 0.0f);
		}
		return 0;

	case audioMasterPinConnected:		
		SHOW_CALLBACK ("amc: audioMasterPinConnected\n");
		// inquire if an input or output is beeing connected;
		// index enumerates input or output counting from zero:
		// value is 0 for input and != 0 otherwise. note: the
		// return value is 0 for <true> such that older versions
		// will always return true.
		return 1;

	case audioMasterWantMidi:
		SHOW_CALLBACK ("amc: audioMasterWantMidi\n");
		// <value> is a filter which is currently ignored
		return 0;

	case audioMasterGetTime:
		SHOW_CALLBACK ("amc: audioMasterGetTime\n");
		// returns const VstTimeInfo* (or 0 if not supported)
		// <value> should contain a mask indicating which fields are required
		// (see valid masks above), as some items may require extensive
		// conversions
		memset(&_timeInfo, 0, sizeof(_timeInfo));
		if (session) {
			_timeInfo.samplePos = session->transport_frame();
			_timeInfo.sampleRate = session->frame_rate();
		}
		return (long)&_timeInfo;

	case audioMasterProcessEvents:
		SHOW_CALLBACK ("amc: audioMasterProcessEvents\n");
		// VstEvents* in <ptr>
		return 0;

	case audioMasterSetTime:
		SHOW_CALLBACK ("amc: audioMasterSetTime\n");
		// VstTimenfo* in <ptr>, filter in <value>, not supported

	case audioMasterTempoAt:
		SHOW_CALLBACK ("amc: audioMasterTempoAt\n");
		// returns tempo (in bpm * 10000) at sample frame location passed in <value>
		return 0;

	case audioMasterGetNumAutomatableParameters:
		SHOW_CALLBACK ("amc: audioMasterGetNumAutomatableParameters\n");
		return 0;

	case audioMasterGetParameterQuantization:	
		SHOW_CALLBACK ("amc: audioMasterGetParameterQuantization\n");
               // returns the integer value for +1.0 representation,
	       // or 1 if full single float precision is maintained
               // in automation. parameter index in <value> (-1: all, any)
		return 0;

	case audioMasterIOChanged:
		SHOW_CALLBACK ("amc: audioMasterIOChanged\n");
	       // numInputs and/or numOutputs has changed
		return 0;

	case audioMasterNeedIdle:
		SHOW_CALLBACK ("amc: audioMasterNeedIdle\n");
	       // plug needs idle calls (outside its editor window)
		return 0;

	case audioMasterSizeWindow:
		SHOW_CALLBACK ("amc: audioMasterSizeWindow\n");
		// index: width, value: height
		return 0;

	case audioMasterGetSampleRate:
		SHOW_CALLBACK ("amc: audioMasterGetSampleRate\n");
		return 0;

	case audioMasterGetBlockSize:
		SHOW_CALLBACK ("amc: audioMasterGetBlockSize\n");
		return 0;

	case audioMasterGetInputLatency:
		SHOW_CALLBACK ("amc: audioMasterGetInputLatency\n");
		return 0;

	case audioMasterGetOutputLatency:
		SHOW_CALLBACK ("amc: audioMasterGetOutputLatency\n");
		return 0;

	case audioMasterGetPreviousPlug:
		SHOW_CALLBACK ("amc: audioMasterGetPreviousPlug\n");
	       // input pin in <value> (-1: first to come), returns cEffect*
		return 0;

	case audioMasterGetNextPlug:
		SHOW_CALLBACK ("amc: audioMasterGetNextPlug\n");
	       // output pin in <value> (-1: first to come), returns cEffect*

	case audioMasterWillReplaceOrAccumulate:
		SHOW_CALLBACK ("amc: audioMasterWillReplaceOrAccumulate\n");
	       // returns: 0: not supported, 1: replace, 2: accumulate
		return 0;

	case audioMasterGetCurrentProcessLevel:
		SHOW_CALLBACK ("amc: audioMasterGetCurrentProcessLevel\n");
		// returns: 0: not supported,
		// 1: currently in user thread (gui)
		// 2: currently in audio thread (where process is called)
		// 3: currently in 'sequencer' thread (midi, timer etc)
		// 4: currently offline processing and thus in user thread
		// other: not defined, but probably pre-empting user thread.
		return 0;
		
	case audioMasterGetAutomationState:
		SHOW_CALLBACK ("amc: audioMasterGetAutomationState\n");
		// returns 0: not supported, 1: off, 2:read, 3:write, 4:read/write
		// offline
		return 0;

	case audioMasterOfflineStart:
		SHOW_CALLBACK ("amc: audioMasterOfflineStart\n");
	case audioMasterOfflineRead:
		SHOW_CALLBACK ("amc: audioMasterOfflineRead\n");
	       // ptr points to offline structure, see below. return 0: error, 1 ok
		return 0;

	case audioMasterOfflineWrite:
		SHOW_CALLBACK ("amc: audioMasterOfflineWrite\n");
		// same as read
		return 0;

	case audioMasterOfflineGetCurrentPass:
		SHOW_CALLBACK ("amc: audioMasterOfflineGetCurrentPass\n");
	case audioMasterOfflineGetCurrentMetaPass:
		SHOW_CALLBACK ("amc: audioMasterOfflineGetCurrentMetaPass\n");
		return 0;

	case audioMasterSetOutputSampleRate:
		SHOW_CALLBACK ("amc: audioMasterSetOutputSampleRate\n");
		// for variable i/o, sample rate in <opt>
		return 0;

	case audioMasterGetSpeakerArrangement:
		SHOW_CALLBACK ("amc: audioMasterGetSpeakerArrangement\n");
		// (long)input in <value>, output in <ptr>
		return 0;

	case audioMasterGetVendorString:
		SHOW_CALLBACK ("amc: audioMasterGetVendorString\n");
		// fills <ptr> with a string identifying the vendor (max 64 char)
		strcpy ((char*) ptr, "Linux Audio Systems");
		return 0;

	case audioMasterGetProductString:
		SHOW_CALLBACK ("amc: audioMasterGetProductString\n");
		// fills <ptr> with a string with product name (max 64 char)
		strcpy ((char*) ptr, "Ardour");
		return 0;

	case audioMasterGetVendorVersion:
		SHOW_CALLBACK ("amc: audioMasterGetVendorVersion\n");
		// returns vendor-specific version
		return 900;
		
	case audioMasterVendorSpecific:
		SHOW_CALLBACK ("amc: audioMasterVendorSpecific\n");
		// no definition, vendor specific handling
		return 0;
		
	case audioMasterSetIcon:
		SHOW_CALLBACK ("amc: audioMasterSetIcon\n");
		// void* in <ptr>, format not defined yet
		return 0;
		
	case audioMasterCanDo:
		SHOW_CALLBACK ("amc: audioMasterCanDo\n");
		// string in ptr, see below
		return 0;
		
	case audioMasterGetLanguage:
		SHOW_CALLBACK ("amc: audioMasterGetLanguage\n");
		// see enum
		return 0;
		
	case audioMasterOpenWindow:
		SHOW_CALLBACK ("amc: audioMasterOpenWindow\n");
		// returns platform specific ptr
		return 0;
		
	case audioMasterCloseWindow:
		SHOW_CALLBACK ("amc: audioMasterCloseWindow\n");
		// close window, platform specific handle in <ptr>
		return 0;
		
	case audioMasterGetDirectory:
		SHOW_CALLBACK ("amc: audioMasterGetDirectory\n");
		// get plug directory, FSSpec on MAC, else char*
		return 0;
		
	case audioMasterUpdateDisplay:
		SHOW_CALLBACK ("amc: audioMasterUpdateDisplay\n");
		// something has changed, update 'multi-fx' display
		if (effect) {
			effect->dispatcher(effect, effEditIdle, 0, 0, NULL, 0.0f);
		}
		return 0;
		
	case audioMasterBeginEdit:
		SHOW_CALLBACK ("amc: audioMasterBeginEdit\n");
		// begin of automation session (when mouse down), parameter index in <index>
		return 0;
		
	case audioMasterEndEdit:
		SHOW_CALLBACK ("amc: audioMasterEndEdit\n");
		// end of automation session (when mouse up),     parameter index in <index>
		return 0;
		
	case audioMasterOpenFileSelector:
		SHOW_CALLBACK ("amc: audioMasterOpenFileSelector\n");
		// open a fileselector window with VstFileSelect* in <ptr>
		return 0;
		
	default:
		SHOW_CALLBACK ("VST master dispatcher: undefed: %d, %d\n", opcode, effKeysRequired);
		break;
	}	
	
	return 0;
}

