seq_oss_midi.c

linux-2.6.15.6

		return 0;
	}

	perm &= ~mdev->opened;

	memset(&subs, 0, sizeof(subs));

	if (perm & PERM_WRITE) {
		subs.sender = dp->addr;
		subs.dest.client = mdev->client;
		subs.dest.port = mdev->port;
		if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
			mdev->opened |= PERM_WRITE;
	}
	if (perm & PERM_READ) {
		subs.sender.client = mdev->client;
		subs.sender.port = mdev->port;
		subs.dest = dp->addr;
		subs.flags = SNDRV_SEQ_PORT_SUBS_TIMESTAMP;
		subs.queue = dp->queue;		/* queue for timestamps */
		if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
			mdev->opened |= PERM_READ;
	}

	if (! mdev->opened) {
		snd_use_lock_free(&mdev->use_lock);
		return -ENXIO;
	}

	mdev->devinfo = dp;
	snd_use_lock_free(&mdev->use_lock);
	return 0;
}

/*
 * close the midi device if already opened
 */
int
snd_seq_oss_midi_close(seq_oss_devinfo_t *dp, int dev)
{
	seq_oss_midi_t *mdev;
	snd_seq_port_subscribe_t subs;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return -ENODEV;
	if (! mdev->opened || mdev->devinfo != dp) {
		snd_use_lock_free(&mdev->use_lock);
		return 0;
	}

	debug_printk(("closing client %d port %d mode %d\n", mdev->client, mdev->port, mdev->opened));
	memset(&subs, 0, sizeof(subs));
	if (mdev->opened & PERM_WRITE) {
		subs.sender = dp->addr;
		subs.dest.client = mdev->client;
		subs.dest.port = mdev->port;
		snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
	}
	if (mdev->opened & PERM_READ) {
		subs.sender.client = mdev->client;
		subs.sender.port = mdev->port;
		subs.dest = dp->addr;
		snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
	}

	mdev->opened = 0;
	mdev->devinfo = NULL;

	snd_use_lock_free(&mdev->use_lock);
	return 0;
}

/*
 * change seq capability flags to file mode flags
 */
int
snd_seq_oss_midi_filemode(seq_oss_devinfo_t *dp, int dev)
{
	seq_oss_midi_t *mdev;
	int mode;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return 0;

	mode = 0;
	if (mdev->opened & PERM_WRITE)
		mode |= SNDRV_SEQ_OSS_FILE_WRITE;
	if (mdev->opened & PERM_READ)
		mode |= SNDRV_SEQ_OSS_FILE_READ;

	snd_use_lock_free(&mdev->use_lock);
	return mode;
}

/*
 * reset the midi device and close it:
 * so far, only close the device.
 */
void
snd_seq_oss_midi_reset(seq_oss_devinfo_t *dp, int dev)
{
	seq_oss_midi_t *mdev;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return;
	if (! mdev->opened) {
		snd_use_lock_free(&mdev->use_lock);
		return;
	}

	if (mdev->opened & PERM_WRITE) {
		snd_seq_event_t ev;
		int c;

		debug_printk(("resetting client %d port %d\n", mdev->client, mdev->port));
		memset(&ev, 0, sizeof(ev));
		ev.dest.client = mdev->client;
		ev.dest.port = mdev->port;
		ev.queue = dp->queue;
		ev.source.port = dp->port;
		if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH) {
			ev.type = SNDRV_SEQ_EVENT_SENSING;
			snd_seq_oss_dispatch(dp, &ev, 0, 0); /* active sensing */
		}
		for (c = 0; c < 16; c++) {
			ev.type = SNDRV_SEQ_EVENT_CONTROLLER;
			ev.data.control.channel = c;
			ev.data.control.param = 123;
			snd_seq_oss_dispatch(dp, &ev, 0, 0); /* all notes off */
			if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
				ev.data.control.param = 121;
				snd_seq_oss_dispatch(dp, &ev, 0, 0); /* reset all controllers */
				ev.type = SNDRV_SEQ_EVENT_PITCHBEND;
				ev.data.control.value = 0;
				snd_seq_oss_dispatch(dp, &ev, 0, 0); /* bender off */
			}
		}
	}
	// snd_seq_oss_midi_close(dp, dev);
	snd_use_lock_free(&mdev->use_lock);
}


/*
 * get client/port of the specified MIDI device
 */
void
snd_seq_oss_midi_get_addr(seq_oss_devinfo_t *dp, int dev, snd_seq_addr_t *addr)
{
	seq_oss_midi_t *mdev;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return;
	addr->client = mdev->client;
	addr->port = mdev->port;
	snd_use_lock_free(&mdev->use_lock);
}


/*
 * input callback - this can be atomic
 */
int
snd_seq_oss_midi_input(snd_seq_event_t *ev, int direct, void *private_data)
{
	seq_oss_devinfo_t *dp = (seq_oss_devinfo_t *)private_data;
	seq_oss_midi_t *mdev;
	int rc;

	if (dp->readq == NULL)
		return 0;
	if ((mdev = find_slot(ev->source.client, ev->source.port)) == NULL)
		return 0;
	if (! (mdev->opened & PERM_READ)) {
		snd_use_lock_free(&mdev->use_lock);
		return 0;
	}

	if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
		rc = send_synth_event(dp, ev, mdev->seq_device);
	else
		rc = send_midi_event(dp, ev, mdev);

	snd_use_lock_free(&mdev->use_lock);
	return rc;
}

/*
 * convert ALSA sequencer event to OSS synth event
 */
static int
send_synth_event(seq_oss_devinfo_t *dp, snd_seq_event_t *ev, int dev)
{
	evrec_t ossev;

	memset(&ossev, 0, sizeof(ossev));

	switch (ev->type) {
	case SNDRV_SEQ_EVENT_NOTEON:
		ossev.v.cmd = MIDI_NOTEON; break;
	case SNDRV_SEQ_EVENT_NOTEOFF:
		ossev.v.cmd = MIDI_NOTEOFF; break;
	case SNDRV_SEQ_EVENT_KEYPRESS:
		ossev.v.cmd = MIDI_KEY_PRESSURE; break;
	case SNDRV_SEQ_EVENT_CONTROLLER:
		ossev.l.cmd = MIDI_CTL_CHANGE; break;
	case SNDRV_SEQ_EVENT_PGMCHANGE:
		ossev.l.cmd = MIDI_PGM_CHANGE; break;
	case SNDRV_SEQ_EVENT_CHANPRESS:
		ossev.l.cmd = MIDI_CHN_PRESSURE; break;
	case SNDRV_SEQ_EVENT_PITCHBEND:
		ossev.l.cmd = MIDI_PITCH_BEND; break;
	default:
		return 0; /* not supported */
	}

	ossev.v.dev = dev;

	switch (ev->type) {
	case SNDRV_SEQ_EVENT_NOTEON:
	case SNDRV_SEQ_EVENT_NOTEOFF:
	case SNDRV_SEQ_EVENT_KEYPRESS:
		ossev.v.code = EV_CHN_VOICE;
		ossev.v.note = ev->data.note.note;
		ossev.v.parm = ev->data.note.velocity;
		ossev.v.chn = ev->data.note.channel;
		break;
	case SNDRV_SEQ_EVENT_CONTROLLER:
	case SNDRV_SEQ_EVENT_PGMCHANGE:
	case SNDRV_SEQ_EVENT_CHANPRESS:
		ossev.l.code = EV_CHN_COMMON;
		ossev.l.p1 = ev->data.control.param;
		ossev.l.val = ev->data.control.value;
		ossev.l.chn = ev->data.control.channel;
		break;
	case SNDRV_SEQ_EVENT_PITCHBEND:
		ossev.l.code = EV_CHN_COMMON;
		ossev.l.val = ev->data.control.value + 8192;
		ossev.l.chn = ev->data.control.channel;
		break;
	}
	
	snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
	snd_seq_oss_readq_put_event(dp->readq, &ossev);

	return 0;
}

/*
 * decode event and send MIDI bytes to read queue
 */
static int
send_midi_event(seq_oss_devinfo_t *dp, snd_seq_event_t *ev, seq_oss_midi_t *mdev)
{
	char msg[32];
	int len;
	
	snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
	if (!dp->timer->running)
		len = snd_seq_oss_timer_start(dp->timer);
	if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {
		if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) == SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
			snd_seq_oss_readq_puts(dp->readq, mdev->seq_device,
					       ev->data.ext.ptr, ev->data.ext.len);
	} else {
		len = snd_midi_event_decode(mdev->coder, msg, sizeof(msg), ev);
		if (len > 0)
			snd_seq_oss_readq_puts(dp->readq, mdev->seq_device, msg, len);
	}

	return 0;
}


/*
 * dump midi data
 * return 0 : enqueued
 *        non-zero : invalid - ignored
 */
int
snd_seq_oss_midi_putc(seq_oss_devinfo_t *dp, int dev, unsigned char c, snd_seq_event_t *ev)
{
	seq_oss_midi_t *mdev;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return -ENODEV;
	if (snd_midi_event_encode_byte(mdev->coder, c, ev) > 0) {
		snd_seq_oss_fill_addr(dp, ev, mdev->client, mdev->port);
		snd_use_lock_free(&mdev->use_lock);
		return 0;
	}
	snd_use_lock_free(&mdev->use_lock);
	return -EINVAL;
}

/*
 * create OSS compatible midi_info record
 */
int
snd_seq_oss_midi_make_info(seq_oss_devinfo_t *dp, int dev, struct midi_info *inf)
{
	seq_oss_midi_t *mdev;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return -ENXIO;
	inf->device = dev;
	inf->dev_type = 0; /* FIXME: ?? */
	inf->capabilities = 0; /* FIXME: ?? */
	strlcpy(inf->name, mdev->name, sizeof(inf->name));
	snd_use_lock_free(&mdev->use_lock);
	return 0;
}


/*
 * proc interface
 */
static char *
capmode_str(int val)
{
	val &= PERM_READ|PERM_WRITE;
	if (val == (PERM_READ|PERM_WRITE))
		return "read/write";
	else if (val == PERM_READ)
		return "read";
	else if (val == PERM_WRITE)
		return "write";
	else
		return "none";
}

void
snd_seq_oss_midi_info_read(snd_info_buffer_t *buf)
{
	int i;
	seq_oss_midi_t *mdev;

	snd_iprintf(buf, "\nNumber of MIDI devices: %d\n", max_midi_devs);
	for (i = 0; i < max_midi_devs; i++) {
		snd_iprintf(buf, "\nmidi %d: ", i);
		mdev = get_mdev(i);
		if (mdev == NULL) {
			snd_iprintf(buf, "*empty*\n");
			continue;
		}
		snd_iprintf(buf, "[%s] ALSA port %d:%d\n", mdev->name,
			    mdev->client, mdev->port);
		snd_iprintf(buf, "  capability %s / opened %s\n",
			    capmode_str(mdev->flags),
			    capmode_str(mdev->opened));
		snd_use_lock_free(&mdev->use_lock);
	}
}