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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2003 The ScummVM project
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*/
#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif
#if defined(UNIX) && defined(USE_ALSA)
#include "sound/mpu401.h"
#include "stdafx.h"
#include "common/engine.h" // for warning/error/debug
#include <alsa/asoundlib.h>
/*
* ALSA sequencer driver
* Mostly cut'n'pasted from Virtual Tiny Keyboard (vkeybd) by Takashi Iwai
* (you really rox, you know?)
*/
#if SND_LIB_MINOR >= 6
#define snd_seq_flush_output(x) snd_seq_drain_output(x)
#define snd_seq_set_client_group(x,name) /*nop */
#define my_snd_seq_open(seqp) snd_seq_open(seqp, "hw", SND_SEQ_OPEN_OUTPUT, 0)
#else
/* SND_SEQ_OPEN_OUT causes oops on early version of ALSA */
#define my_snd_seq_open(seqp) snd_seq_open(seqp, SND_SEQ_OPEN)
#endif
/*
* parse address string
*/
#define ADDR_DELIM ".:"
class MidiDriver_ALSA:public MidiDriver_MPU401 {
public:
MidiDriver_ALSA();
int open();
void close();
void send(uint32 b);
void sysEx(byte *msg, uint16 length);
private:
void send_event(int do_flush);
bool _isOpen;
snd_seq_event_t ev;
snd_seq_t *seq_handle;
int seq_client, seq_port;
int my_client, my_port;
static int parse_addr(const char *arg, int *client, int *port);
};
MidiDriver_ALSA::MidiDriver_ALSA()
: _isOpen(false), seq_handle(0), seq_client(0), seq_port(0), my_client(0), my_port(0)
{
}
int MidiDriver_ALSA::open() {
char *var;
unsigned int caps;
if (_isOpen)
return MERR_ALREADY_OPEN;
_isOpen = true;
if (!(var = getenv("SCUMMVM_PORT"))) {
// default alsa port if none specified
if (parse_addr("65:0", &seq_client, &seq_port) < 0) {
error("Invalid port %s", var);
return -1;
}
}
else {
if (parse_addr(var, &seq_client, &seq_port) < 0) {
error("Invalid port %s", var);
return -1;
}
}
if (my_snd_seq_open(&seq_handle)) {
error("Can't open sequencer");
return -1;
}
my_client = snd_seq_client_id(seq_handle);
snd_seq_set_client_name(seq_handle, "SCUMMVM");
snd_seq_set_client_group(seq_handle, "input");
caps = SND_SEQ_PORT_CAP_READ;
if (seq_client == SND_SEQ_ADDRESS_SUBSCRIBERS)
caps = ~SND_SEQ_PORT_CAP_SUBS_READ;
my_port =
snd_seq_create_simple_port(seq_handle, "SCUMMVM", caps,
SND_SEQ_PORT_TYPE_MIDI_GENERIC | SND_SEQ_PORT_TYPE_APPLICATION);
if (my_port < 0) {
snd_seq_close(seq_handle);
error("Can't create port");
return -1;
}
if (seq_client != SND_SEQ_ADDRESS_SUBSCRIBERS) {
/* subscribe to MIDI port */
if (snd_seq_connect_to(seq_handle, my_port, seq_client, seq_port) < 0) {
snd_seq_close(seq_handle);
error("Can't subscribe to MIDI port (%d:%d)", seq_client, seq_port);
return -1;
}
}
printf("ALSA client initialised [%d:%d]\n", seq_client, seq_port);
return 0;
}
void MidiDriver_ALSA::close() {
_isOpen = false;
MidiDriver_MPU401::close();
if (seq_handle)
snd_seq_close(seq_handle);
}
void MidiDriver_ALSA::send(uint32 b) {
unsigned int midiCmd[4];
ev.type = SND_SEQ_EVENT_OSS;
midiCmd[3] = (b & 0xFF000000) >> 24;
midiCmd[2] = (b & 0x00FF0000) >> 16;
midiCmd[1] = (b & 0x0000FF00) >> 8;
midiCmd[0] = (b & 0x000000FF);
ev.data.raw32.d[0] = midiCmd[0];
ev.data.raw32.d[1] = midiCmd[1];
ev.data.raw32.d[2] = midiCmd[2];
unsigned char chanID = midiCmd[0] & 0x0F;
switch (midiCmd[0] & 0xF0) {
case 0x80:
snd_seq_ev_set_noteoff(&ev, chanID, midiCmd[1], midiCmd[2]);
send_event(1);
break;
case 0x90:
snd_seq_ev_set_noteon(&ev, chanID, midiCmd[1], midiCmd[2]);
send_event(1);
break;
case 0xB0:
/* is it this simple ? Wow... */
snd_seq_ev_set_controller(&ev, chanID, midiCmd[1], midiCmd[2]);
send_event(1);
break;
case 0xC0:
snd_seq_ev_set_pgmchange(&ev, chanID, midiCmd[1]);
send_event(0);
break;
case 0xE0:{
// long theBend = ((((long)midiCmd[1] + (long)(midiCmd[2] << 7))) - 0x2000) / 4;
// snd_seq_ev_set_pitchbend(&ev, chanID, theBend);
long theBend = ((long)midiCmd[1] + (long)(midiCmd[2] << 7)) - 0x2000;
snd_seq_ev_set_pitchbend(&ev, chanID, theBend);
send_event(1);
}
break;
default:
error("Unknown Command: %08x\n", (int)b);
/* I don't know if this works but, well... */
send_event(1);
break;
}
}
void MidiDriver_ALSA::sysEx(byte *msg, uint16 length) {
unsigned char buf[1024];
if (length > 254) {
warning("Cannot send SysEx block - data too large");
return;
}
buf[0] = 0xF0;
memcpy(buf + 1, msg, length);
buf[length + 1] = 0xF7;
snd_seq_ev_set_sysex(&ev, length + 2, &buf);
send_event(1);
}
int MidiDriver_ALSA::parse_addr(const char *arg, int *client, int *port) {
char *p;
if (isdigit(*arg)) {
if ((p = strpbrk(arg, ADDR_DELIM)) == NULL)
return -1;
*client = atoi(arg);
*port = atoi(p + 1);
} else {
if (*arg == 's' || *arg == 'S') {
*client = SND_SEQ_ADDRESS_SUBSCRIBERS;
*port = 0;
} else
return -1;
}
return 0;
}
void MidiDriver_ALSA::send_event(int do_flush) {
snd_seq_ev_set_direct(&ev);
snd_seq_ev_set_source(&ev, my_port);
snd_seq_ev_set_dest(&ev, seq_client, seq_port);
snd_seq_event_output(seq_handle, &ev);
if (do_flush)
snd_seq_flush_output(seq_handle);
}
MidiDriver *MidiDriver_ALSA_create() {
return new MidiDriver_ALSA();
}
#endif
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