/***************************************************************************
 camd-midi.c Copyright (C) 2005--08 Walter van Niftrik, Christoph Reichenbach


 This program may be modified and copied freely according to the terms of
 the GNU general public license (GPL), as long as the above copyright
 notice and the licensing information contained herein are preserved.

 Please refer to www.gnu.org for licensing details.

 This work is provided AS IS, without warranty of any kind, expressed or
 implied, including but not limited to the warranties of merchantibility,
 noninfringement, and fitness for a specific purpose. The author will not
 be held liable for any damage caused by this work or derivatives of it.

 By using this source code, you agree to the licensing terms as stated
 above.


 Please contact the maintainer for bug reports or inquiries.

 Current Maintainer:

    Walter van Niftrik <w.f.b.w.v.niftrik@stud.tue.nl>

***************************************************************************/

#include "sfx_engine.h"
#include "sfx_device.h"

#include <proto/camd.h>
#include <proto/dos.h>
#include <proto/exec.h>
#include <proto/intuition.h>
#include <stdio.h>


#define SWAP_BYTES

#define SCI_CAMD_MIDI_VERSION "0.1"
#define SYSEX_PREFIX 0xf0

static const char *devicename = "via686.out.0";

struct Library *CamdBase = NULL;
static struct MidiLink *midi_link = NULL;
static struct MidiNode *midi_node = NULL;

#define ABORT(m) {						\
			if (CamdBase)				\
                   		CloseLibrary(CamdBase);		\
			sciprintf("[SFX] CAMD driver: ");	\
			sciprintf(m);				\
			sciprintf("\n");			\
			return SFX_ERROR;			\
	}

static int
camd_init(midi_writer_t *self)
{
	sciprintf("[SFX] Initialising CAMD raw MIDI backend, v%s\n", SCI_CAMD_MIDI_VERSION);

	CamdBase = OpenLibrary("camd.library", 36L);
	if (!CamdBase)
		ABORT("Could not open 'camd.library'");

	midi_node = CreateMidi(TAG_END);
	if (!midi_node)
		ABORT("Could not create CAMD MIDI node");

	midi_link = AddMidiLink(midi_node, MLTYPE_Sender, "freesci.out", MLINK_Location, devicename, TAG_END);
	if (!midi_link)
		ABORT(("Could not create CAMD MIDI link to '%s'", devicename));

	return SFX_OK;
}

static int
camd_set_option(midi_writer_t *self, char *name, char *value)
{
	return SFX_ERROR;
}

static int
camd_write(midi_writer_t *self, unsigned char *buffer, int len)
{
	if (buffer[0] == SYSEX_PREFIX) {
		/* Must send this as a SysEx */
		PutSysEx(midi_link, buffer);
	} else {
		ULONG data = 0l;
		int i;

		for (i = 0; i < 3; i++)
			if (len >= i)
				data |= (buffer[i]) << (8 * i);

		/* The following generates the inverse byte ordering: */
#ifdef SWAP_BYTES
		data = 0l;
		for (i = 0; i < (len > 3)? 3 : len; i++)
			if (len >= i) {
				data <<= 8;
				data |= buffer[i];
			}
#ifdef FILL_BYTES
		data <<= (8 * (4 - ((len > 3)? 3 : len)));
#endif
#endif


		if (len > 3)
			sciprintf("[SFX] Warning: Truncated MIDI message to fit CAMD format (sent 3: %02x %02x %02x, real length %d)\n",
				  buffer[0], buffer[1], buffer[2], len);

		PutMidi(midi_link, data);
	}

	return SFX_OK;
}

static void
camd_delay(midi_writer_t *self, int ticks)
{
}

static void
camd_reset_timer(midi_writer_t *self)
{
}

static void
camd_close(midi_writer_t *self)
{
	if (CamdBase)
		CloseLibrary(CamdBase);
}

midi_writer_t sfx_device_midi_camd = {
	"camd-midi",
	&camd_init,
	&camd_set_option,
	&camd_write,
	&camd_delay,
	NULL,
	&camd_reset_timer,
	&camd_close
};