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midi_extension.cpp
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midi_extension.cpp
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/**********************************************************************
* Copyright (c) 2014, Hogeschool voor de Kunsten Utrecht
* Hilversum, the Netherlands
* All rights reserved
***********************************************************************
* 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 3 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, see <http://www.gnu.org/licenses/>.
***********************************************************************
*
* File name : midi_extension.cpp
* System name : racket_midi
*
* Description : MIDI I/O module for Racket
* Needs Portmidi and Racket
*
* Author : Marc Groenewegen
* E-mail : marcg@dinkum.nl
*
**********************************************************************/
#include "escheme.h"
#include "midi_io.h"
/*
* The following functions are exported to Scheme. NB: after initialising
* you can't change input or output so set input/output device BEFORE
* calling start-midi-io!
*
* (list-midi-devices)
* (set-midi-input)
* (set-midi-output)
* (start-midi-io)
* (stop-midi-io)
* (note-on)
* (note-off)
* (read-midi-event)
*/
MIDI_io midi_io;
static Scheme_Object *list_devices(int argc, Scheme_Object **argv)
{
const PmDeviceInfo *info; // portMidi device info
Scheme_Object *output_list;
/*
* Use PortMidi info to build an array of device info objects
*/
Scheme_Object *device_info[Pm_CountDevices()];
/* device info object with details about the device:
* int index
* string direction --> IN or OUT
* string name
*/
Scheme_Object *device_info_detail[Pm_CountDevices()][3];
// Build a list of lists
for(int d=0;d<Pm_CountDevices();d++)
{
device_info_detail[d][0]=scheme_make_integer(d);
info = Pm_GetDeviceInfo(d);
if(info->input > 0)
device_info_detail[d][1]=scheme_make_utf8_string("IN");
else if(info->output > 0)
device_info_detail[d][1]=scheme_make_utf8_string("OUT");
else
device_info_detail[d][1]=scheme_make_utf8_string("-");
device_info_detail[d][2]=scheme_make_utf8_string(info->name);
device_info[d]=scheme_build_list(3,device_info_detail[d]);
} // for
output_list=scheme_build_list(Pm_CountDevices(),device_info);
return output_list;
} // list_devices()
static Scheme_Object *set_input_device(int argc, Scheme_Object **argv)
{
intptr_t device;
scheme_get_int_val(argv[0],&device);
midi_io.set_input_device((int)device);
return scheme_void;
} // set_input_device()
static Scheme_Object *set_output_device(int argc, Scheme_Object **argv)
{
intptr_t device;
scheme_get_int_val(argv[0],&device);
midi_io.set_output_device((int)device);
return scheme_void;
} // set_output_device()
static Scheme_Object *startmidi(int argc, Scheme_Object **argv)
{
int status=midi_io.initialise();
if(status < 0){
switch(status) {
case ERROR_OPEN_INPUT: scheme_signal_error("Error opening input port");
break;
case ERROR_OPEN_OUTPUT: scheme_signal_error("Error opening output port");
break;
default: scheme_signal_error("Unknown error");
break;
} // switch
}
return scheme_void;
} // startmidi()
static Scheme_Object *stopmidi(int argc, Scheme_Object **argv)
{
midi_io.finalise();
return scheme_void;
} // stopmidi()
static Scheme_Object *note_on(int argc, Scheme_Object **argv)
{
intptr_t channel,note,velocity;
PmEvent event;
scheme_get_int_val(argv[0],&channel);
scheme_get_int_val(argv[1],¬e);
scheme_get_int_val(argv[2],&velocity);
/*
#define Pm_Message(status, data1, data2) \
((((data2) << 16) & 0xFF0000) | \
(((data1) << 8) & 0xFF00) | \
((status) & 0xFF))
*/
event.message=Pm_Message(0x90+(int)channel,(int)note,(int)velocity);
event.timestamp=0;
midi_io.write_event(&event);
return scheme_void;
} // note_on()
static Scheme_Object *note_off(int argc, Scheme_Object **argv)
{
intptr_t channel,note,velocity;
PmEvent event;
scheme_get_int_val(argv[0],&channel);
scheme_get_int_val(argv[1],¬e);
scheme_get_int_val(argv[2],&velocity);
event.message=Pm_Message(0x80+(unsigned char)channel,
(unsigned char)note,
(unsigned char)velocity);
event.timestamp=0;
midi_io.write_event(&event);
return scheme_void;
} // note_off()
static Scheme_Object *read_event(int argc, Scheme_Object **argv)
{
PmEvent event;
bool event_read;
unsigned char cmd,channel,data1,data2;
Scheme_Object *resultvector[4];
event_read=midi_io.read_event(event); // event is passed by reference
if(event_read){
cmd=Pm_MessageStatus(event.message)&0xf0;
channel=Pm_MessageStatus(event.message)&0xf;
data1=Pm_MessageData1(event.message);
data2=Pm_MessageData2(event.message);
resultvector[0]=scheme_make_integer((int)cmd);
resultvector[1]=scheme_make_integer((int)channel);
resultvector[2]=scheme_make_integer((int)data1);
resultvector[3]=scheme_make_integer((int)data2);
return scheme_build_list(4,resultvector);
} // if event read
else {
resultvector[0]=resultvector[1]=resultvector[2]=resultvector[3]=scheme_make_integer(0);
return scheme_build_list(4,resultvector);
}
} // read_event()
Scheme_Object *scheme_reload(Scheme_Env *env)
{
Scheme_Object *proc;
Scheme_Env *mod_env;
mod_env = scheme_primitive_module(scheme_intern_symbol("midi_extension"),env);
// make sure we start with a clean slate
midi_io.finalise();
proc=scheme_make_prim_w_arity(list_devices,"list-midi-devices",0,0);
scheme_add_global("list-midi-devices",proc,mod_env);
proc=scheme_make_prim_w_arity(set_input_device,"set-midi-input",1,1);
scheme_add_global("set-midi-input",proc,mod_env);
proc=scheme_make_prim_w_arity(set_output_device,"set-midi-output",1,1);
scheme_add_global("set-midi-output",proc,mod_env);
proc=scheme_make_prim_w_arity(startmidi,"start-midi-io",0,0);
scheme_add_global("start-midi-io",proc,mod_env);
proc=scheme_make_prim_w_arity(stopmidi,"stop-midi-io",0,0);
scheme_add_global("stop-midi-io",proc,mod_env);
proc=scheme_make_prim_w_arity(note_on,"note-on",3,3);
scheme_add_global("note-on",proc,mod_env);
proc=scheme_make_prim_w_arity(note_off,"note-off",3,3);
scheme_add_global("note-off",proc,mod_env);
proc=scheme_make_prim_w_arity(read_event,"read-midi-event",0,0);
scheme_add_global("read-midi-event",proc,mod_env);
scheme_finish_primitive_module(mod_env);
return scheme_void;
} // scheme_reload()
Scheme_Object *scheme_initialize(Scheme_Env *env)
{
return scheme_reload(env);
} // scheme_initialize()
// called when the extension is loaded to satisfy a require declaration
Scheme_Object *scheme_module_name()
{
return scheme_intern_symbol("midi_extension");
} // scheme_module_name()