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/*importmidi.c
* midi file import functions
* for Denemo, a gtk+ frontend to GNU Lilypond
* (c) 2003-2005 AJAnderson
*
* TODO
*
* multi voice support
* lyrics
* triplet support
*
*/
#include <stdlib.h>
#include <stdint.h>
#include <math.h>
#include <string.h>
#include <assert.h>
#include <denemo/denemo.h>
#include "importmidi.h"
#include "staffops.h"
#include "smf.h"
#include "view.h"
#include "utils.h"
#include "file.h"
#include "commandfuncs.h"
#include "processstaffname.h"
#define TEXT 0x01
#define COPYRIGHT 0X02
#define META_TRACK_NAME 0x03
#define META_INSTR_NAME 0x04
#define META_TEMPO 0x51
#define META_TIMESIG 0x58
#define META_KEYSIG 0x59
#define NOTE_OFF 0x80
#define NOTE_ON 0x90
#define AFTERTOUCH 0xA0
#define CTRL_CHANGE 0xB0
#define PGM_CHANGE 0xC0
#define CHNL_PRESSURE 0xD0
#define PCH_WHEEL 0xE0
#define SYS_EXCLUSIVE_MESSAGE1 0xF0
#define META_EVENT 0xFF
typedef struct notetype
{
gint notetype;
gint numofdots;
}notetype;
typedef struct harmonic
{
gint pitch;
gint enshift;
}harmonic;
static void
note_from_int(char *buf, int note_number)
{
int note, octave;
char *names[] = {"C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"};
octave = note_number / 12 - 1;
note = note_number % 12;
sprintf(buf, "%s%d", names[note], octave);
}
static harmonic
enharmonic (gint input, gint key)
{
harmonic local;
local.pitch = (input / 12) - 5;
local.enshift = input % 12;
switch (local.enshift)
{
case 0: //c
{
local.pitch = (key > 6) ? (-1 + local.pitch * 7) : (local.pitch * 7);
local.enshift = (key > 6) ? (1) : (0);
break;
}
case 1: //c#
{
local.pitch = (key < -3) ? (1 + local.pitch * 7) : (local.pitch * 7);
local.enshift = (key < -3) ? (-1) : (1);
break;
}
case 2: //D
{
local.pitch = 1 + local.pitch * 7;
local.enshift = 0;
break;
}
case 3: //D#
{
local.pitch =
(key < -1) ? (2 + local.pitch * 7) : (1 + local.pitch * 7);
local.enshift = (key < -1) ? (-1) : (1);
break;
}
case 4: //E
{
local.pitch =
(key < -6) ? (3 + local.pitch * 7) : (2 + local.pitch * 7);
local.enshift = (key < -6) ? (-1) : (0);
break;
}
case 5: //F
{
local.pitch =
(key > 5) ? (2 + local.pitch * 7) : (3 + local.pitch * 7);
local.enshift = (key > 5) ? (1) : (0);
break;
}
case 6: //F#
{
local.pitch =
(key < -4) ? (4 + local.pitch * 7) : (3 + local.pitch * 7);
local.enshift = (key < -4) ? (-1) : (1);
break;
}
case 7: //G
{
local.pitch = 4 + local.pitch * 7;
local.enshift = 0;
break;
}
case 8: //G#
{
local.pitch =
(key < -2) ? (5 + local.pitch * 7) : (4 + local.pitch * 7);
local.enshift = (key < -2) ? (-1) : (1);
break;
}
case 9: //A
{
local.pitch = 5 + local.pitch * 7;
local.enshift = 0;
break;
}
case 10: //A#
{
local.pitch =
(key < 0) ? (6 + local.pitch * 7) : (5 + local.pitch * 7);
local.enshift = (key < 0) ? (-1) : (1);
break;
}
case 11: //B
{
local.pitch =
(key < -5) ? (7 + local.pitch * 7) : (6 + local.pitch * 7);
local.enshift = (key < -5) ? (-1) : (0);
break;
}
};
return local;
}
static void
ConvertLength(gint ppqn, gint duration, notetype *pnotetype){
/*convert length to 2 = quarter, 1 = half, 0 = whole etc...... */
/* quarter = 384, half = 768, whole = 1536*/
gint notetype = 0;
gint numofdots = 0;
gint leftover = 0;
gint dsq = (4 * ppqn);
g_debug("\nDuration = %d ticks\n", duration);
while ((dsq >> notetype) > duration)
notetype++;
leftover = duration - (dsq >> notetype);
if((dsq >> notetype+1)>0)
while (leftover >= (dsq >> (notetype +1))){
leftover -= (dsq >> (notetype +1));
numofdots++;
}
pnotetype->notetype = notetype;
pnotetype->numofdots = numofdots;
}
/**
* Insert time signature into current staff
*
*/
static void
dotimesig (gint numerator, gint denominator)
{
DenemoGUI *gui = Denemo.gui;
/*only does initial TS */
DenemoStaff *curstaffstruct = (DenemoStaff *) gui->si->currentstaff->data;
curstaffstruct->timesig.time1 = numerator;
curstaffstruct->timesig.time2 = denominator;
}
/**
* Insert key signature into the current staff
*
*/
static void
dokeysig (gint isminor, gint key)
{
DenemoGUI *gui = Denemo.gui;
if (key > 7)
key = key - 256; /*get flat key num, see keysigdialog.cpp */
#ifdef DEBUG
g_print("\nkey = %d\n", key);
#endif
DenemoStaff *curstaffstruct = (DenemoStaff *) gui->si->currentstaff->data;
curstaffstruct->keysig.number = key;
curstaffstruct->keysig.isminor = isminor;
dnm_setinitialkeysig (curstaffstruct, key, isminor);
}
static void
dotempo (gint tempo)
{
DenemoGUI *gui = Denemo.gui;
gui->si->tempo = (gint) (6.0e7 / (double) tempo);
}
static void
dotrackname (gchar *name)
{
DenemoGUI *gui = Denemo.gui;
DenemoStaff *curstaffstruct = (DenemoStaff *) gui->si->currentstaff->data;
if(name)
g_string_assign(curstaffstruct->denemo_name, name);
}
static void
doinstrname (gchar* name)
{
DenemoGUI *gui = Denemo.gui;
DenemoStaff *curstaffstruct = (DenemoStaff *) gui->si->currentstaff->data;
if(name)
g_string_assign(curstaffstruct->midi_instrument, name);
}
static void
insert_rest_into_score(notetype length)
{
DenemoGUI *gui = Denemo.gui;
gint i;
switch (length.notetype)
{
case 0:
insert_rest_0key (gui);
break;
case 1:
insert_rest_1key (gui);
break;
case 2:
insert_rest_2key (gui);
break;
case 3:
insert_rest_3key (gui);
break;
case 4:
insert_rest_4key (gui);
break;
case 5:
insert_rest_5key (gui);
break;
case 6:
insert_rest_6key (gui);
break;
default:
insert_rest_2key (gui);
break;
}
displayhelper (gui);
/* add dots */
for (i=0;i<length.numofdots;i++)
add_dot_key (gui);
}
static void
AddRest(gint ppqn, gint duration)
{
gint rest;
gint ticks;
if (duration == 0)
return;
rest = duration;
while (rest){
notetype length;
ConvertLength(ppqn, rest, &length);
insert_rest_into_score(length);
ticks = ConvertNoteType2ticks(ppqn, &length);
rest -= ticks;
}
}
static void
insert_note_into_score(gint pitch, notetype length)
{
DenemoGUI *gui = Denemo.gui;
DenemoStaff *curstaffstruct = (DenemoStaff *) gui->si->currentstaff->data;
gint i;
/* 0-8 accepted bellow */
DenemoScriptParam param;
switch(length.notetype) {
case 0:
InsertDur0(NULL, ¶m);
break;
case 1:
InsertDur1(NULL, ¶m);
break;
case 2:
InsertDur2(NULL, ¶m);
break;
case 3:
InsertDur3(NULL, ¶m);
break;
case 4:
InsertDur4(NULL, ¶m);
break;
case 5:
InsertDur5(NULL, ¶m);
break;
case 6:
InsertDur6(NULL, ¶m);
break;
case 7:
InsertDur7(NULL, ¶m);
break;
default:
InsertDur2(NULL, ¶m);
g_warning("Cannot handle size %d",length.notetype);
break;
}
g_debug("DenemoScriptParam = %d",param.status);
/* get correct note name */
gint key = curstaffstruct->keysig.number;
harmonic enote = enharmonic (pitch, (gint) key);
gchar *name = mid_c_offsettolily (enote.pitch, enote.enshift);
/* Rename note to the correct note */
gchar *accidental = g_strdup_printf("(d-ChangeChordNotes \"%s\")", name);
call_out_to_guile(accidental);
g_free(accidental);
/* Add dots */
for (i=0;i<length.numofdots;i++)
add_dot_key (gui);
displayhelper(gui);
}
static void
AddNote(gint ppqn, gint pitch, gint duration)
{
if (duration == 0)
return;
notetype length;
ConvertLength(ppqn, duration, &length);
insert_note_into_score(pitch, length);
}
static smf_t*
cmd_load(gchar *file_name)
{
smf_t *smf;
smf = smf_load(file_name);
if (smf == NULL) {
g_critical("Couldn't load '%s'.", file_name);
return NULL;
}
g_message("File '%s' loaded.", file_name);
g_message("%s.", smf_decode(smf));
return smf;
}
#define BUFFER_SIZE 1024
void
decode_metadata(const smf_event_t *event)
{
int off = 0, mspqn, flats, isminor;
char *buf;
static const char *const major_keys[] = {"Fb", "Cb", "Gb", "Db", "Ab",
"Eb", "Bb", "F", "C", "G", "D", "A", "E", "B", "F#", "C#", "G#"};
static const char *const minor_keys[] = {"Dbm", "Abm", "Ebm", "Bbm", "Fm",
"Cm", "Gm", "Dm", "Am", "Em", "Bm", "F#m", "C#m", "G#m", "D#m", "A#m", "E#m"};
//assert(smf_event_is_metadata(event));
switch (event->midi_buffer[1]) {
case TEXT:
//return smf_event_decode_textual(event, "Text");
case COPYRIGHT:
//return smf_event_decode_textual(event, "Copyright");
case META_TRACK_NAME:
//return smf_event_decode_textual(event, "Sequence/Track Name");
dotrackname(smf_event_extract_text(event));
case META_INSTR_NAME:
//printf("\nInstrument text = %s\n", smf_string_from_event(event));
doinstrname(smf_event_extract_text(event));
case 0x05:
//return smf_event_decode_textual(event, "Lyric");
case 0x06:
//return smf_event_decode_textual(event, "Marker");
case 0x07:
//return smf_event_decode_textual(event, "Cue Point");
case 0x08:
//return smf_event_decode_textual(event, "Program Name");
case 0x09:
//return smf_event_decode_textual(event, "Device (Port) Name");
default:
break;
}
buf = malloc(BUFFER_SIZE);
if (buf == NULL) {
g_critical("smf_event_decode_metadata: malloc failed.");
}
switch (event->midi_buffer[1]) {
case 0x00:
off += snprintf(buf + off, BUFFER_SIZE - off, "Sequence number");
break;
/* http://music.columbia.edu/pipermail/music-dsp/2004-August/061196.html */
case 0x20:
if (event->midi_buffer_length < 4) {
g_critical("smf_event_decode_metadata: truncated MIDI message.");
goto error;
}
off += snprintf(buf + off, BUFFER_SIZE - off, "Channel Prefix: %d.", event->midi_buffer[3]);
break;
case 0x21:
if (event->midi_buffer_length < 4) {
g_critical("smf_event_decode_metadata: truncated MIDI message.");
goto error;
}
off += snprintf(buf + off, BUFFER_SIZE - off, "Midi Port: %d.", event->midi_buffer[3]);
break;
case 0x2F:
off += snprintf(buf + off, BUFFER_SIZE - off, "End Of Track");
break;
case META_TEMPO:
if (event->midi_buffer_length < 6) {
g_critical("smf_event_decode_metadata: truncated MIDI message.");
goto error;
}
mspqn = (event->midi_buffer[3] << 16) + (event->midi_buffer[4] << 8) + event->midi_buffer[5];
dotempo(mspqn);
break;
case 0x54:
off += snprintf(buf + off, BUFFER_SIZE - off, "SMPTE Offset");
break;
case META_TIMESIG:
if (event->midi_buffer_length < 7) {
g_critical("smf_event_decode_metadata: truncated MIDI message.");
goto error;
}
dotimesig(event->midi_buffer[3], (int)pow(2, event->midi_buffer[4]));
break;
case META_KEYSIG:
if (event->midi_buffer_length < 5) {
g_critical("smf_event_decode_metadata: truncated MIDI message.");
goto error;
}
flats = event->midi_buffer[3];
isminor = event->midi_buffer[4];
if (isminor != 0 && isminor != 1) {
g_critical("smf_event_decode_metadata: last byte of the Key Signature event has invalid value %d.", isminor);
goto error;
}
dokeysig(isminor, flats);
break;
case 0x7F:
off += snprintf(buf + off, BUFFER_SIZE - off, "Proprietary (aka Sequencer) Event, length %d",
event->midi_buffer_length);
break;
default:
goto error;
}
error:
free(buf);
}
/**
* extremely simple quantizer that rounds
* to the closest granule size
*/
static gint
round2granule(gint tick)
{
gint smallestgrain = 48;
gdouble div = ((gdouble) tick / (gdouble) smallestgrain);
return smallestgrain * (gint) round(div);
}
/**
* Process note off command
*/
void
donoteoff (const smf_event_t *event)
{
gint duration;
gint ppqn;
ppqn = event->track->smf->ppqn;
duration = event->delta_time_pulses;
duration = round2granule(duration);
AddNote(ppqn, event->midi_buffer[1], duration);
}
/**
* Process note on command
*/
void
donoteon (const smf_event_t *event)
{
gint ppqn;
ppqn = event->track->smf->ppqn;
if (event->delta_time_pulses)
AddRest(ppqn, round2granule(event->delta_time_pulses));
}
void
decode_midi_event(const smf_event_t *event)
{
gint off = 0, channel;
gchar note[5];
/* + 1, because user-visible channels used to be in range <1-16>. */
channel = (event->midi_buffer[0] & 0x0F) + 1;
switch (event->midi_buffer[0] & SYS_EXCLUSIVE_MESSAGE1) {
case NOTE_OFF:
note_from_int(note, event->midi_buffer[1]);
g_debug("\nNote Off channel %d note %s velocity %d\n",
channel, note, event->midi_buffer[2]);
donoteoff (event);
break;
case NOTE_ON:
note_from_int(note, event->midi_buffer[1]);
g_debug("\nNote On channel %d note %s velocity %d\n",
channel, note, event->midi_buffer[2]);
if (event->midi_buffer[2])
donoteon(event);
else
donoteoff(event);
break;
case AFTERTOUCH:
note_from_int(note, event->midi_buffer[1]);
g_debug("\nAftertouch channel %d note %s velocity %d\n",
channel, note, event->midi_buffer[2]);
break;
case CTRL_CHANGE:
g_debug("\nController channel %d controller %d value %d\n",
channel, event->midi_buffer[1], event->midi_buffer[2]);
break;
case PGM_CHANGE:
g_debug("\nProgram Change channel %d controller %d\n",
channel, event->midi_buffer[1]);
break;
case CHNL_PRESSURE:
g_debug("\nChannel Pressure channel %d pressure %d\n",
channel, event->midi_buffer[1]);
break;
case PCH_WHEEL:
g_debug("\nPitch Wheel channel %d value %d\n",
channel, ((int)event->midi_buffer[2] << 7) | (int)event->midi_buffer[2]);
break;
default:
break;
}
}
static int
process_midi(smf_event_t *event)
{
if (smf_event_is_metadata(event))
decode_metadata(event);
else
decode_midi_event(event);
return 0;
}
gint
process_track(smf_track_t *track)
{
smf_event_t *event;
smf_t *smf = track->smf;//tracks can't be processed except inside an smf_t so create one if needed
gboolean delete_smf_after = FALSE;
if(smf==NULL){
delete_smf_after = TRUE;
smf = smf_new();
smf_add_track(smf, track);
smf_rewind(smf);
}
while (event = smf_track_get_next_event(track))
process_midi(event);
if(delete_smf_after) {
smf_track_remove_from_smf(track);
smf_delete(smf);
}
return 1;
}
void AddStaff(){
call_out_to_guile("(d-AddAfter)");
}
static gint
readtrack(smf_t *smf)
{
smf_event_t *event;
smf_track_t *selected_track;
gint track;
smf_rewind(smf);
for (track=1;track <= smf->number_of_tracks;track++){
selected_track = smf_get_track_by_number(smf, track);
process_track(selected_track);
if (track+1 <= smf->number_of_tracks)
AddStaff();
}
return 0;
}
gint
ConvertNoteType2ticks(gint ppqn, notetype *gnotetype){
gint ticks;
gint notetype = (int) gnotetype->notetype;
gint numofdots = (int) gnotetype->numofdots;
gint dsq = (4 * ppqn);
gint i = 0;
ticks = dsq >> notetype;
while (i++ < numofdots)
ticks += dsq >> (notetype + 1);
return ticks;
}
gint
importMidi (gchar *filename, DenemoGUI *gui)
{
smf_t *smf;
gint ret = 0; // (-1 on failure)
/* load the file */
smf = cmd_load(filename);
if(!smf)
return -1;
/* Read Track Data */
if (readtrack(smf))
return -1;
/* Delete data...Does it free it? */
smf_delete(smf);
return ret;
}
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