split alsa from mididrv

svn-id: r5890

1 files changed, 246 insertions, 0 deletions

diff --git a/backends/midi/alsa.cpp b/backends/midi/alsa.cpp
new file mode 100644
index 0000000000..538b0cd74b
--- /dev/null
+++ b/backends/midi/alsa.cpp
@@ -0,0 +1,246 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2001  Ludvig Strigeus
+ * Copyright (C) 2001/2002 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(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(int mode);
+	void close();
+	void send(uint32 b);
+	void pause(bool p);
+	void set_stream_callback(void *param, StreamCallback *sc);
+	// void setPitchBendRange (byte channel, uint range);
+
+private:
+	void send_event(int do_flush);
+	snd_seq_event_t ev;
+	StreamCallback *_stream_proc;
+	void *_stream_param;
+	int _mode;
+	snd_seq_t *seq_handle;
+	int seq_client, seq_port;
+	int my_client, my_port;
+	static int parse_addr(char *arg, int *client, int *port);
+};
+
+MidiDriver_ALSA::MidiDriver_ALSA():_mode(0), seq_handle(0), seq_client(0), seq_port(0), my_client(0),
+my_port(0)
+{
+}
+
+int MidiDriver_ALSA::parse_addr(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);
+}
+
+int MidiDriver_ALSA::open(int mode)
+{
+	char *var;
+	unsigned int caps;
+
+	if (_mode != 0)
+		return MERR_ALREADY_OPEN;
+
+	if (mode != MO_SIMPLE)
+		return MERR_STREAMING_NOT_AVAILABLE;
+
+	_mode = mode;
+
+	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", my_client, my_port);
+
+	return 0;
+}
+
+void MidiDriver_ALSA::close()
+{
+	_mode = 0;
+	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::pause(bool p)
+{
+	if (_mode == MO_STREAMING) {
+		/* Err... and what? */
+	}
+}
+
+void MidiDriver_ALSA::set_stream_callback(void *param, StreamCallback *sc)
+{
+	_stream_param = param;
+	_stream_proc = sc;
+}
+
+MidiDriver *MidiDriver_ALSA_create()
+{
+	return new MidiDriver_ALSA();
+}
+
+#endif