Currently midi capable programs can control midi hardware, but

cannot cooperate with other programs.  The aim of this change is
to allow any program to send midi data to other programs as they
were midi hardware. For instance, this change should solve the
longstanding problem of using a midi sequencer with software
synthesizers. More precisely:

 - new midicat(1) utility (actually hardlink to aucat(1)).
   it creates software midi thru boxes, allowing programs
   to send midi messages to other programs as they were
   midi(4) hardware.

 - new midi api in libsndio (see mio_open(3)), to access
   midi(4) devices and midicat(1) sockets in a uniform way.

 - new device naming scheme <service>:<unit>[.<option>],
   common to audio and midi.

 - new sndio(7) manual describing concepts and naming

The current audio device naming still works, but people having
scripts or configuration files containing device names could read
the sndio(7) man page and slowly start updating device names.

discussed with jakemsr@ and deraadt@, help form jmc@

1 files changed, 69 insertions, 0 deletions

diff --git a/lib/libsndio/mio_priv.h b/lib/libsndio/mio_priv.h
new file mode 100644
index 00000000000..240267333ba
--- /dev/null
+++ b/lib/libsndio/mio_priv.h
@@ -0,0 +1,69 @@
+/*	$OpenBSD: mio_priv.h,v 1.1 2009/07/25 08:44:26 ratchov Exp $	*/
+/*
+ * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#ifndef MIO_PRIV_H
+#define MIO_PRIV_H
+
+#include <sys/param.h>
+#include "sndio.h"
+
+#ifdef DEBUG
+#define DPRINTF(...)						\
+	do {							\
+		if (mio_debug > 0)				\
+			fprintf(stderr, __VA_ARGS__);		\
+	} while(0)
+#define DPERROR(s)						\
+	do {							\
+		if (mio_debug > 0)				\
+			perror(s);				\
+	} while(0)
+#else
+#define DPRINTF(...) do {} while(0)
+#define DPERROR(s) do {} while(0)
+#endif
+
+/*
+ * private ``handle'' structure
+ */
+struct mio_hdl {
+	struct mio_ops *ops;
+	unsigned mode;			/* MIO_PLAY | MIO_REC */
+	int nbio;			/* true if non-blocking io */
+	int eof;			/* true if error occured */
+};
+
+/*
+ * operations every device should support
+ */
+struct mio_ops {
+	void (*close)(struct mio_hdl *);
+	size_t (*write)(struct mio_hdl *, void *, size_t);
+	size_t (*read)(struct mio_hdl *, void *, size_t);
+	int (*pollfd)(struct mio_hdl *, struct pollfd *, int);
+	int (*revents)(struct mio_hdl *, struct pollfd *);
+};
+
+struct mio_hdl *mio_open_rmidi(char *, unsigned, int);
+struct mio_hdl *mio_open_thru(char *, unsigned, int);
+void mio_create(struct mio_hdl *, struct mio_ops *, unsigned, int);
+void mio_destroy(struct mio_hdl *);
+
+#ifdef DEBUG
+extern int mio_debug;
+#endif
+
+#endif /* !defined(MIO_PRIV_H) */