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|
/*
* sound/oss/midi_synth.c
*
* High level midi sequencer manager for dumb MIDI interfaces.
*/
/*
* Copyright (C) by Hannu Savolainen 1993-1997
*
* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
* Version 2 (June 1991). See the "COPYING" file distributed with this software
* for more info.
*/
/*
* Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
* Andrew Veliath : fixed running status in MIDI input state machine
*/
#define USE_SEQ_MACROS
#define USE_SIMPLE_MACROS
#include "sound_config.h"
#define _MIDI_SYNTH_C_
#include "midi_synth.h"
static int midi2synth[MAX_MIDI_DEV];
static int sysex_state[MAX_MIDI_DEV] =
{0};
static unsigned char prev_out_status[MAX_MIDI_DEV];
#define STORE(cmd) \
{ \
int len; \
unsigned char obuf[8]; \
cmd; \
seq_input_event(obuf, len); \
}
#define _seqbuf obuf
#define _seqbufptr 0
#define _SEQ_ADVBUF(x) len=x
void
do_midi_msg(int synthno, unsigned char *msg, int mlen)
{
switch (msg[0] & 0xf0)
{
case 0x90:
if (msg[2] != 0)
{
STORE(SEQ_START_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
break;
}
msg[2] = 64;
case 0x80:
STORE(SEQ_STOP_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
break;
case 0xA0:
STORE(SEQ_KEY_PRESSURE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
break;
case 0xB0:
STORE(SEQ_CONTROL(synthno, msg[0] & 0x0f,
msg[1], msg[2]));
break;
case 0xC0:
STORE(SEQ_SET_PATCH(synthno, msg[0] & 0x0f, msg[1]));
break;
case 0xD0:
STORE(SEQ_CHN_PRESSURE(synthno, msg[0] & 0x0f, msg[1]));
break;
case 0xE0:
STORE(SEQ_BENDER(synthno, msg[0] & 0x0f,
(msg[1] & 0x7f) | ((msg[2] & 0x7f) << 7)));
break;
default:
/* printk( "MPU: Unknown midi channel message %02x\n", msg[0]); */
;
}
}
EXPORT_SYMBOL(do_midi_msg);
static void
midi_outc(int midi_dev, int data)
{
int timeout;
for (timeout = 0; timeout < 3200; timeout++)
if (midi_devs[midi_dev]->outputc(midi_dev, (unsigned char) (data & 0xff)))
{
if (data & 0x80) /*
* Status byte
*/
prev_out_status[midi_dev] =
(unsigned char) (data & 0xff); /*
* Store for running status
*/
return; /*
* Mission complete
*/
}
/*
* Sorry! No space on buffers.
*/
printk("Midi send timed out\n");
}
static int
prefix_cmd(int midi_dev, unsigned char status)
{
if ((char *) midi_devs[midi_dev]->prefix_cmd == NULL)
return 1;
return midi_devs[midi_dev]->prefix_cmd(midi_dev, status);
}
static void
midi_synth_input(int orig_dev, unsigned char data)
{
int dev;
struct midi_input_info *inc;
static unsigned char len_tab[] = /* # of data bytes following a status
*/
{
2, /* 8x */
2, /* 9x */
2, /* Ax */
2, /* Bx */
1, /* Cx */
1, /* Dx */
2, /* Ex */
0 /* Fx */
};
if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
return;
if (data == 0xfe) /* Ignore active sensing */
return;
dev = midi2synth[orig_dev];
inc = &midi_devs[orig_dev]->in_info;
switch (inc->m_state)
{
case MST_INIT:
if (data & 0x80) /* MIDI status byte */
{
if ((data & 0xf0) == 0xf0) /* Common message */
{
switch (data)
{
case 0xf0: /* Sysex */
inc->m_state = MST_SYSEX;
break; /* Sysex */
case 0xf1: /* MTC quarter frame */
case 0xf3: /* Song select */
inc->m_state = MST_DATA;
inc->m_ptr = 1;
inc->m_left = 1;
inc->m_buf[0] = data;
break;
case 0xf2: /* Song position pointer */
inc->m_state = MST_DATA;
inc->m_ptr = 1;
inc->m_left = 2;
inc->m_buf[0] = data;
break;
default:
inc->m_buf[0] = data;
inc->m_ptr = 1;
do_midi_msg(dev, inc->m_buf, inc->m_ptr);
inc->m_ptr = 0;
inc->m_left = 0;
}
} else
{
inc->m_state = MST_DATA;
inc->m_ptr = 1;
inc->m_left = len_tab[(data >> 4) - 8];
inc->m_buf[0] = inc->m_prev_status = data;
}
} else if (inc->m_prev_status & 0x80) {
/* Data byte (use running status) */
inc->m_ptr = 2;
inc->m_buf[1] = data;
inc->m_buf[0] = inc->m_prev_status;
inc->m_left = len_tab[(inc->m_buf[0] >> 4) - 8] - 1;
if (inc->m_left > 0)
inc->m_state = MST_DATA; /* Not done yet */
else {
inc->m_state = MST_INIT;
do_midi_msg(dev, inc->m_buf, inc->m_ptr);
inc->m_ptr = 0;
}
}
break; /* MST_INIT */
case <
|