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/*
midisend.c:
Copyright (C) 1997 Dave Philips
(C) 2005 Istvan Varga
This file is part of Csound.
The Csound Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "csoundCore.h" /* MIDISEND.C */
#include "midioops.h"
typedef struct midiOutFile_s {
FILE *f;
void *fd;
unsigned int prv_tick;
size_t nBytes;
unsigned char prv_status;
} midiOutFile_t;
static const unsigned char midiMsgBytes[32] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 0, 1
};
/* header for type 0 (1 track) MIDI file with 1/3 ms time resolution */
static const unsigned char midiOutFile_header[25] = {
0x4D, 0x54, 0x68, 0x64, /* "MThd" */
0x00, 0x00, 0x00, 0x06, /* header length */
0x00, 0x00, /* file type */
0x00, 0x01, /* number of tracks */
0x19, 0x78, /* tick time (1/25 sec / 120), */
/*VL this was 0xE7, which was wrong, changed to 0x19 0x78 */
0x4D, 0x54, 0x72, 0x6B, /* "MTrk" */
0x00, 0x00, 0x00, 0x00, /* track length (updated later) */
/* -------------------------------------------------------- */
0xFF, 0x2F, 0x00 /* end of track */
};
/* write a single event to MIDI out file */
static CS_NOINLINE void
csoundWriteMidiOutFile(CSOUND *csound, const unsigned char *evt, int nbytes)
{
unsigned char buf[8];
double s;
midiOutFile_t *p = (midiOutFile_t *) csound->midiGlobals->midiOutFileData;
unsigned int t, prv;
int ndx = 0;
if (nbytes < 2)
return;
s = csound->icurTime/csound->esr;
/* this check (for perf time run?) used the global pds, which has now
been removed. My impression is that it is sufficient to check
for csound->ids, but this might need attention if MIDI file output
has problems
*/
if (csound->ids == NULL)
s -= csound->ksmps/csound->esr;
s *= 13040.; /* VL NOV 11: this was 3000.0, which was wrong;
13040.0 was arrived at by experimentation */
#ifdef HAVE_C99
t = (unsigned int) lrint(s);
#else
t = (unsigned int) ((int) (s + 0.5));
#endif
t = ((int) t >= 0L ? t : 0UL);
prv = p->prv_tick;
p->prv_tick = t;
t -= prv;
if (t > 0x0000007FUL) {
if (t > 0x00003FFFUL) {
if (t > 0x001FFFFFUL) {
buf[ndx++] = ((unsigned char) (t >> 21) & (unsigned char) 0x7F)
| (unsigned char) 0x80;
}
buf[ndx++] = ((unsigned char) (t >> 14) & (unsigned char) 0x7F)
| (unsigned char) 0x80;
}
buf[ndx++] = ((unsigned char) (t >> 7) & (unsigned char) 0x7F)
| (unsigned char) 0x80;
}
buf[ndx++] = (unsigned char) t & (unsigned char) 0x7F;
{
unsigned char st = *evt;
if (st != p->prv_status) {
buf[ndx++] = st;
p->prv_status = st;
}
}
buf[ndx++] = evt[1];
if (nbytes > 2)
buf[ndx++] = evt[2];
p->nBytes += (size_t) ndx;
fwrite(&(buf[0]), (size_t) 1, (size_t) ndx, p->f);
}
void send_midi_message(CSOUND *csound, int status, int data1, int data2)
{
MGLOBAL *p = csound->midiGlobals;
unsigned char buf[4];
unsigned char nbytes;
buf[0] = (unsigned char) status;
nbytes = midiMsgBytes[(unsigned char) status >> 3];
buf[1] = (unsigned char) data1;
buf[2] = (unsigned char) data2;
if (!nbytes)
return;
if (csound->oparms_.Midioutname != NULL)
p->MidiWriteCallback(csound, p->midiOutUserData, &(buf[0]), (int) nbytes);
if (p->midiOutFileData != NULL)
csoundWriteMidiOutFile(csound, &(buf[0]), (int) nbytes);
}
void note_on(CSOUND *csound, int chan, int num, int vel)
{
send_midi_message(csound, (chan & 0x0F) | MD_NOTEON, num, vel);
}
void note_off(CSOUND *csound, int chan, int num, int vel)
{
send_midi_message(csound, (chan & 0x0F) | MD_NOTEOFF, num, vel);
}
void control_change(CSOUND *csound, int chan, int num, int value)
{
send_midi_message(csound, (chan & 0x0F) | MD_CNTRLCHG, num, value);
}
void after_touch(CSOUND *csound, int chan, int value)
{
send_midi_message(csound, (chan & 0x0F) | MD_CHANPRESS, value, 0);
}
void program_change(CSOUND *csound, int chan, int num)
{
send_midi_message(csound, (chan & 0x0F) | MD_PGMCHG, num, 0);
}
void pitch_bend(CSOUND *csound, int chan, int lsb, int msb)
{
send_midi_message(csound, (chan & 0x0F) | MD_PTCHBENDCHG, lsb, msb);
}
void poly_after_touch(CSOUND *csound, int chan, int note_num, int value)
{
send_midi_message(csound, (chan & 0x0F) | MD_POLYAFTER, note_num, value);
}
void openMIDIout(CSOUND *csound)
{
MGLOBAL *p = csound->midiGlobals;
midiOutFile_t *fp;
OPARMS *O = &(csound->oparms_);
int retval;
/* open MIDI out device */
if (O->Midioutname != NULL && !p->MIDIoutDONE) {
if (UNLIKELY(p->MidiOutOpenCallback == NULL))
csoundDie(csound, Str(" *** no callback for opening MIDI output"));
if (UNLIKELY(p->MidiWriteCallback == NULL))
csoundDie(csound, Str(" *** no callback for writing MIDI data"));
p->MIDIoutDONE = 1;
retval = p->MidiOutOpenCallback(csound, &(p->midiOutUserData),
O->Midioutname);
if (UNLIKELY(retval != 0)) {
csoundDie(csound,
Str(" *** error opening MIDI out device: %d (%s)"),
retval, csoundExternalMidiErrorString(csound, retval));
}
}
/* open MIDI out file */
if (O->FMidioutname == NULL || p->midiOutFileData != NULL)
return;
fp = (midiOutFile_t *) csound->Calloc(csound, sizeof(midiOutFile_t));
fp->fd = csound->FileOpen2(csound, &(fp->f), CSFILE_STD, O->FMidioutname,
"wb", NULL, CSFTYPE_STD_MIDI, 0);
if (UNLIKELY(fp->fd == NULL)) {
csoundDie(csound, Str(" *** error opening MIDI out file '%s'"),
O->FMidioutname);
}
p->midiOutFileData = (void *) fp;
/* write header */
if (UNLIKELY(fwrite(&(midiOutFile_header[0]),
(size_t)1, (size_t)22, fp->f) != 22)) {
csound->Die(csound, Str("Short write in MIDI\n"));
}
}
void csoundCloseMidiOutFile(CSOUND *csound)
{
midiOutFile_t *p = (midiOutFile_t *) csound->midiGlobals->midiOutFileData;
/* write end of track meta-event */
csoundWriteMidiOutFile(csound, &(midiOutFile_header[22]), 3);
/* update header for track length */
if (fseek(p->f, 18L, SEEK_SET)<0)
csound->Message(csound, Str("error closing MIDI output file\n"));
fputc((int)(p->nBytes >> 24) & 0xFF, p->f);
fputc((int)(p->nBytes >> 16) & 0xFF, p->f);
fputc((int)(p->nBytes >> 8) & 0xFF, p->f);
fputc((int)(p->nBytes) & 0xFF, p->f);
/* close file and clean up */
csound->midiGlobals->midiOutFileData = NULL;
csound->FileClose(csound, p->fd);
csound->Free(csound, p);
}
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