linux/sound/core/seq/oss/seq_oss_event.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * OSS compatible sequencer driver
 *
 * Copyright (C) 1998,99 Takashi Iwai <[email protected]>
 */

#include "seq_oss_device.h"
#include "seq_oss_synth.h"
#include "seq_oss_midi.h"
#include "seq_oss_event.h"
#include "seq_oss_timer.h"
#include <sound/seq_oss_legacy.h>
#include "seq_oss_readq.h"
#include "seq_oss_writeq.h"
#include <linux/nospec.h>


/*
 * prototypes
 */
static int extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev);
static int chn_voice_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
static int chn_common_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
static int timing_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
static int local_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
static int old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev);
static int note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev);
static int note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev);
static int set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev);
static int set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev);
static int set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev);


/*
 * convert an OSS event to ALSA event
 * return 0 : enqueued
 *        non-zero : invalid - ignored
 */

int
snd_seq_oss_process_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{ … }

/* old type events: mode1 only */
static int
old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{ … }

/* 8bytes extended event: mode1 only */
static int
extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{ … }

/* channel voice events: mode1 and 2 */
static int
chn_voice_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{ … }

/* channel common events: mode1 and 2 */
static int
chn_common_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{ … }

/* timer events: mode1 and mode2 */
static int
timing_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{ … }

/* local events: mode1 and 2 */
static int
local_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{ … }

/*
 * process note-on event for OSS synth
 * three different modes are available:
 * - SNDRV_SEQ_OSS_PROCESS_EVENTS  (for one-voice per channel mode)
 *	Accept note 255 as volume change.
 * - SNDRV_SEQ_OSS_PASS_EVENTS
 *	Pass all events to lowlevel driver anyway
 * - SNDRV_SEQ_OSS_PROCESS_KEYPRESS  (mostly for Emu8000)
 *	Use key-pressure if note >= 128
 */
static int
note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev)
{ … }

/*
 * process note-off event for OSS synth
 */
static int
note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev)
{ … }

/*
 * create a note event
 */
static int
set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev)
{ … }

/*
 * create a control event
 */
static int
set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev)
{ … }

/*
 * create an echo event
 */
static int
set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev)
{ … }

/*
 * event input callback from ALSA sequencer:
 * the echo event is processed here.
 */
int
snd_seq_oss_event_input(struct snd_seq_event *ev, int direct, void *private_data,
			int atomic, int hop)
{ … }