724 строки
19 KiB
C
724 строки
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* GM/GS/XG midi module.
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*
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* Copyright (C) 1999 Steve Ratcliffe
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*
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* Based on awe_wave.c by Takashi Iwai
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*/
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/*
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* This module is used to keep track of the current midi state.
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* It can be used for drivers that are required to emulate midi when
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* the hardware doesn't.
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*
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* It was written for a AWE64 driver, but there should be no AWE specific
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* code in here. If there is it should be reported as a bug.
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/seq_kernel.h>
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#include <sound/seq_midi_emul.h>
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#include <sound/initval.h>
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#include <sound/asoundef.h>
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MODULE_AUTHOR("Takashi Iwai / Steve Ratcliffe");
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MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI emulation.");
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MODULE_LICENSE("GPL");
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/* Prototypes for static functions */
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static void note_off(const struct snd_midi_op *ops, void *drv,
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struct snd_midi_channel *chan,
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int note, int vel);
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static void do_control(const struct snd_midi_op *ops, void *private,
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struct snd_midi_channel_set *chset,
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struct snd_midi_channel *chan,
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int control, int value);
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static void rpn(const struct snd_midi_op *ops, void *drv,
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struct snd_midi_channel *chan,
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struct snd_midi_channel_set *chset);
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static void nrpn(const struct snd_midi_op *ops, void *drv,
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struct snd_midi_channel *chan,
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struct snd_midi_channel_set *chset);
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static void sysex(const struct snd_midi_op *ops, void *private,
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unsigned char *sysex,
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int len, struct snd_midi_channel_set *chset);
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static void all_sounds_off(const struct snd_midi_op *ops, void *private,
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struct snd_midi_channel *chan);
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static void all_notes_off(const struct snd_midi_op *ops, void *private,
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struct snd_midi_channel *chan);
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static void snd_midi_reset_controllers(struct snd_midi_channel *chan);
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static void reset_all_channels(struct snd_midi_channel_set *chset);
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/*
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* Process an event in a driver independent way. This means dealing
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* with RPN, NRPN, SysEx etc that are defined for common midi applications
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* such as GM, GS and XG.
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* There modes that this module will run in are:
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* Generic MIDI - no interpretation at all, it will just save current values
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* of controllers etc.
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* GM - You can use all gm_ prefixed elements of chan. Controls, RPN, NRPN,
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* SysEx will be interpreded as defined in General Midi.
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* GS - You can use all gs_ prefixed elements of chan. Codes for GS will be
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* interpreted.
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* XG - You can use all xg_ prefixed elements of chan. Codes for XG will
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* be interpreted.
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*/
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void
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snd_midi_process_event(const struct snd_midi_op *ops,
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struct snd_seq_event *ev,
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struct snd_midi_channel_set *chanset)
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{
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struct snd_midi_channel *chan;
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void *drv;
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int dest_channel = 0;
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if (ev == NULL || chanset == NULL) {
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pr_debug("ALSA: seq_midi_emul: ev or chanbase NULL (snd_midi_process_event)\n");
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return;
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}
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if (chanset->channels == NULL)
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return;
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if (snd_seq_ev_is_channel_type(ev)) {
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dest_channel = ev->data.note.channel;
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if (dest_channel >= chanset->max_channels) {
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pr_debug("ALSA: seq_midi_emul: dest channel is %d, max is %d\n",
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dest_channel, chanset->max_channels);
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return;
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}
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}
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chan = chanset->channels + dest_channel;
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drv = chanset->private_data;
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/* EVENT_NOTE should be processed before queued */
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if (ev->type == SNDRV_SEQ_EVENT_NOTE)
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return;
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/* Make sure that we don't have a note on that should really be
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* a note off */
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if (ev->type == SNDRV_SEQ_EVENT_NOTEON && ev->data.note.velocity == 0)
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ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
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/* Make sure the note is within array range */
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if (ev->type == SNDRV_SEQ_EVENT_NOTEON ||
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ev->type == SNDRV_SEQ_EVENT_NOTEOFF ||
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ev->type == SNDRV_SEQ_EVENT_KEYPRESS) {
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if (ev->data.note.note >= 128)
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return;
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}
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switch (ev->type) {
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case SNDRV_SEQ_EVENT_NOTEON:
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if (chan->note[ev->data.note.note] & SNDRV_MIDI_NOTE_ON) {
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if (ops->note_off)
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ops->note_off(drv, ev->data.note.note, 0, chan);
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}
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chan->note[ev->data.note.note] = SNDRV_MIDI_NOTE_ON;
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if (ops->note_on)
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ops->note_on(drv, ev->data.note.note, ev->data.note.velocity, chan);
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break;
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case SNDRV_SEQ_EVENT_NOTEOFF:
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if (! (chan->note[ev->data.note.note] & SNDRV_MIDI_NOTE_ON))
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break;
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if (ops->note_off)
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note_off(ops, drv, chan, ev->data.note.note, ev->data.note.velocity);
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break;
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case SNDRV_SEQ_EVENT_KEYPRESS:
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if (ops->key_press)
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ops->key_press(drv, ev->data.note.note, ev->data.note.velocity, chan);
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break;
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case SNDRV_SEQ_EVENT_CONTROLLER:
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do_control(ops, drv, chanset, chan,
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ev->data.control.param, ev->data.control.value);
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break;
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case SNDRV_SEQ_EVENT_PGMCHANGE:
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chan->midi_program = ev->data.control.value;
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break;
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case SNDRV_SEQ_EVENT_PITCHBEND:
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chan->midi_pitchbend = ev->data.control.value;
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if (ops->control)
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ops->control(drv, MIDI_CTL_PITCHBEND, chan);
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break;
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case SNDRV_SEQ_EVENT_CHANPRESS:
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chan->midi_pressure = ev->data.control.value;
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if (ops->control)
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ops->control(drv, MIDI_CTL_CHAN_PRESSURE, chan);
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break;
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case SNDRV_SEQ_EVENT_CONTROL14:
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/* Best guess is that this is any of the 14 bit controller values */
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if (ev->data.control.param < 32) {
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/* set low part first */
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chan->control[ev->data.control.param + 32] =
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ev->data.control.value & 0x7f;
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do_control(ops, drv, chanset, chan,
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ev->data.control.param,
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((ev->data.control.value>>7) & 0x7f));
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} else
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do_control(ops, drv, chanset, chan,
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ev->data.control.param,
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ev->data.control.value);
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break;
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case SNDRV_SEQ_EVENT_NONREGPARAM:
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/* Break it back into its controller values */
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chan->param_type = SNDRV_MIDI_PARAM_TYPE_NONREGISTERED;
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chan->control[MIDI_CTL_MSB_DATA_ENTRY]
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= (ev->data.control.value >> 7) & 0x7f;
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chan->control[MIDI_CTL_LSB_DATA_ENTRY]
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= ev->data.control.value & 0x7f;
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chan->control[MIDI_CTL_NONREG_PARM_NUM_MSB]
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= (ev->data.control.param >> 7) & 0x7f;
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chan->control[MIDI_CTL_NONREG_PARM_NUM_LSB]
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= ev->data.control.param & 0x7f;
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nrpn(ops, drv, chan, chanset);
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break;
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case SNDRV_SEQ_EVENT_REGPARAM:
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/* Break it back into its controller values */
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chan->param_type = SNDRV_MIDI_PARAM_TYPE_REGISTERED;
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chan->control[MIDI_CTL_MSB_DATA_ENTRY]
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= (ev->data.control.value >> 7) & 0x7f;
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chan->control[MIDI_CTL_LSB_DATA_ENTRY]
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= ev->data.control.value & 0x7f;
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chan->control[MIDI_CTL_REGIST_PARM_NUM_MSB]
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= (ev->data.control.param >> 7) & 0x7f;
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chan->control[MIDI_CTL_REGIST_PARM_NUM_LSB]
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= ev->data.control.param & 0x7f;
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rpn(ops, drv, chan, chanset);
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break;
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case SNDRV_SEQ_EVENT_SYSEX:
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if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) == SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
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unsigned char sysexbuf[64];
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int len;
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len = snd_seq_expand_var_event(ev, sizeof(sysexbuf), sysexbuf, 1, 0);
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if (len > 0)
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sysex(ops, drv, sysexbuf, len, chanset);
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}
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break;
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case SNDRV_SEQ_EVENT_SONGPOS:
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case SNDRV_SEQ_EVENT_SONGSEL:
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case SNDRV_SEQ_EVENT_CLOCK:
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case SNDRV_SEQ_EVENT_START:
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case SNDRV_SEQ_EVENT_CONTINUE:
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case SNDRV_SEQ_EVENT_STOP:
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case SNDRV_SEQ_EVENT_QFRAME:
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case SNDRV_SEQ_EVENT_TEMPO:
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case SNDRV_SEQ_EVENT_TIMESIGN:
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case SNDRV_SEQ_EVENT_KEYSIGN:
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goto not_yet;
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case SNDRV_SEQ_EVENT_SENSING:
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break;
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case SNDRV_SEQ_EVENT_CLIENT_START:
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case SNDRV_SEQ_EVENT_CLIENT_EXIT:
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case SNDRV_SEQ_EVENT_CLIENT_CHANGE:
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case SNDRV_SEQ_EVENT_PORT_START:
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case SNDRV_SEQ_EVENT_PORT_EXIT:
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case SNDRV_SEQ_EVENT_PORT_CHANGE:
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case SNDRV_SEQ_EVENT_ECHO:
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not_yet:
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default:
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/*pr_debug("ALSA: seq_midi_emul: Unimplemented event %d\n", ev->type);*/
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break;
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}
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}
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EXPORT_SYMBOL(snd_midi_process_event);
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/*
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* release note
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*/
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static void
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note_off(const struct snd_midi_op *ops, void *drv,
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struct snd_midi_channel *chan,
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int note, int vel)
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{
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if (chan->gm_hold) {
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/* Hold this note until pedal is turned off */
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chan->note[note] |= SNDRV_MIDI_NOTE_RELEASED;
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} else if (chan->note[note] & SNDRV_MIDI_NOTE_SOSTENUTO) {
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/* Mark this note as release; it will be turned off when sostenuto
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* is turned off */
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chan->note[note] |= SNDRV_MIDI_NOTE_RELEASED;
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} else {
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chan->note[note] = 0;
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if (ops->note_off)
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ops->note_off(drv, note, vel, chan);
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}
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}
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/*
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* Do all driver independent operations for this controller and pass
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* events that need to take place immediately to the driver.
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*/
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static void
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do_control(const struct snd_midi_op *ops, void *drv,
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struct snd_midi_channel_set *chset,
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struct snd_midi_channel *chan, int control, int value)
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{
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int i;
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if (control >= ARRAY_SIZE(chan->control))
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return;
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/* Switches */
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if ((control >=64 && control <=69) || (control >= 80 && control <= 83)) {
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/* These are all switches; either off or on so set to 0 or 127 */
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value = (value >= 64)? 127: 0;
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}
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chan->control[control] = value;
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switch (control) {
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case MIDI_CTL_SUSTAIN:
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if (value == 0) {
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/* Sustain has been released, turn off held notes */
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for (i = 0; i < 128; i++) {
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if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) {
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chan->note[i] = SNDRV_MIDI_NOTE_OFF;
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if (ops->note_off)
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ops->note_off(drv, i, 0, chan);
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}
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}
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}
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break;
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case MIDI_CTL_PORTAMENTO:
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break;
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case MIDI_CTL_SOSTENUTO:
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if (value) {
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/* Mark each note that is currently held down */
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for (i = 0; i < 128; i++) {
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if (chan->note[i] & SNDRV_MIDI_NOTE_ON)
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chan->note[i] |= SNDRV_MIDI_NOTE_SOSTENUTO;
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}
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} else {
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/* release all notes that were held */
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for (i = 0; i < 128; i++) {
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if (chan->note[i] & SNDRV_MIDI_NOTE_SOSTENUTO) {
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chan->note[i] &= ~SNDRV_MIDI_NOTE_SOSTENUTO;
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if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) {
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chan->note[i] = SNDRV_MIDI_NOTE_OFF;
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if (ops->note_off)
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ops->note_off(drv, i, 0, chan);
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}
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}
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}
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}
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break;
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case MIDI_CTL_MSB_DATA_ENTRY:
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chan->control[MIDI_CTL_LSB_DATA_ENTRY] = 0;
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/* fall through */
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case MIDI_CTL_LSB_DATA_ENTRY:
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if (chan->param_type == SNDRV_MIDI_PARAM_TYPE_REGISTERED)
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rpn(ops, drv, chan, chset);
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else
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nrpn(ops, drv, chan, chset);
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break;
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case MIDI_CTL_REGIST_PARM_NUM_LSB:
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case MIDI_CTL_REGIST_PARM_NUM_MSB:
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chan->param_type = SNDRV_MIDI_PARAM_TYPE_REGISTERED;
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break;
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case MIDI_CTL_NONREG_PARM_NUM_LSB:
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case MIDI_CTL_NONREG_PARM_NUM_MSB:
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chan->param_type = SNDRV_MIDI_PARAM_TYPE_NONREGISTERED;
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break;
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case MIDI_CTL_ALL_SOUNDS_OFF:
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all_sounds_off(ops, drv, chan);
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break;
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case MIDI_CTL_ALL_NOTES_OFF:
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all_notes_off(ops, drv, chan);
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break;
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case MIDI_CTL_MSB_BANK:
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if (chset->midi_mode == SNDRV_MIDI_MODE_XG) {
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if (value == 127)
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chan->drum_channel = 1;
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else
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chan->drum_channel = 0;
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}
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break;
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case MIDI_CTL_LSB_BANK:
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break;
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case MIDI_CTL_RESET_CONTROLLERS:
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snd_midi_reset_controllers(chan);
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break;
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case MIDI_CTL_SOFT_PEDAL:
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case MIDI_CTL_LEGATO_FOOTSWITCH:
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case MIDI_CTL_HOLD2:
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case MIDI_CTL_SC1_SOUND_VARIATION:
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case MIDI_CTL_SC2_TIMBRE:
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case MIDI_CTL_SC3_RELEASE_TIME:
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case MIDI_CTL_SC4_ATTACK_TIME:
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case MIDI_CTL_SC5_BRIGHTNESS:
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case MIDI_CTL_E1_REVERB_DEPTH:
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case MIDI_CTL_E2_TREMOLO_DEPTH:
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case MIDI_CTL_E3_CHORUS_DEPTH:
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case MIDI_CTL_E4_DETUNE_DEPTH:
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case MIDI_CTL_E5_PHASER_DEPTH:
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goto notyet;
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notyet:
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default:
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if (ops->control)
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ops->control(drv, control, chan);
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break;
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}
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}
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/*
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* initialize the MIDI status
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*/
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void
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snd_midi_channel_set_clear(struct snd_midi_channel_set *chset)
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{
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int i;
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chset->midi_mode = SNDRV_MIDI_MODE_GM;
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chset->gs_master_volume = 127;
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for (i = 0; i < chset->max_channels; i++) {
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struct snd_midi_channel *chan = chset->channels + i;
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memset(chan->note, 0, sizeof(chan->note));
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chan->midi_aftertouch = 0;
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chan->midi_pressure = 0;
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chan->midi_program = 0;
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chan->midi_pitchbend = 0;
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snd_midi_reset_controllers(chan);
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chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */
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chan->gm_rpn_fine_tuning = 0;
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chan->gm_rpn_coarse_tuning = 0;
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if (i == 9)
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chan->drum_channel = 1;
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else
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chan->drum_channel = 0;
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}
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}
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EXPORT_SYMBOL(snd_midi_channel_set_clear);
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/*
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* Process a rpn message.
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*/
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static void
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rpn(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan,
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struct snd_midi_channel_set *chset)
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{
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int type;
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int val;
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if (chset->midi_mode != SNDRV_MIDI_MODE_NONE) {
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type = (chan->control[MIDI_CTL_REGIST_PARM_NUM_MSB] << 8) |
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chan->control[MIDI_CTL_REGIST_PARM_NUM_LSB];
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val = (chan->control[MIDI_CTL_MSB_DATA_ENTRY] << 7) |
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chan->control[MIDI_CTL_LSB_DATA_ENTRY];
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switch (type) {
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case 0x0000: /* Pitch bend sensitivity */
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/* MSB only / 1 semitone per 128 */
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chan->gm_rpn_pitch_bend_range = val;
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break;
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case 0x0001: /* fine tuning: */
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/* MSB/LSB, 8192=center, 100/8192 cent step */
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chan->gm_rpn_fine_tuning = val - 8192;
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break;
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case 0x0002: /* coarse tuning */
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/* MSB only / 8192=center, 1 semitone per 128 */
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chan->gm_rpn_coarse_tuning = val - 8192;
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break;
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case 0x7F7F: /* "lock-in" RPN */
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/* ignored */
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break;
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}
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}
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/* should call nrpn or rpn callback here.. */
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}
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/*
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* Process an nrpn message.
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*/
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static void
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nrpn(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan,
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struct snd_midi_channel_set *chset)
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{
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/* parse XG NRPNs here if possible */
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if (ops->nrpn)
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ops->nrpn(drv, chan, chset);
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}
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/*
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* convert channel parameter in GS sysex
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*/
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static int
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get_channel(unsigned char cmd)
|
|
{
|
|
int p = cmd & 0x0f;
|
|
if (p == 0)
|
|
p = 9;
|
|
else if (p < 10)
|
|
p--;
|
|
return p;
|
|
}
|
|
|
|
|
|
/*
|
|
* Process a sysex message.
|
|
*/
|
|
static void
|
|
sysex(const struct snd_midi_op *ops, void *private, unsigned char *buf, int len,
|
|
struct snd_midi_channel_set *chset)
|
|
{
|
|
/* GM on */
|
|
static const unsigned char gm_on_macro[] = {
|
|
0x7e,0x7f,0x09,0x01,
|
|
};
|
|
/* XG on */
|
|
static const unsigned char xg_on_macro[] = {
|
|
0x43,0x10,0x4c,0x00,0x00,0x7e,0x00,
|
|
};
|
|
/* GS prefix
|
|
* drum channel: XX=0x1?(channel), YY=0x15, ZZ=on/off
|
|
* reverb mode: XX=0x01, YY=0x30, ZZ=0-7
|
|
* chorus mode: XX=0x01, YY=0x38, ZZ=0-7
|
|
* master vol: XX=0x00, YY=0x04, ZZ=0-127
|
|
*/
|
|
static const unsigned char gs_pfx_macro[] = {
|
|
0x41,0x10,0x42,0x12,0x40,/*XX,YY,ZZ*/
|
|
};
|
|
|
|
int parsed = SNDRV_MIDI_SYSEX_NOT_PARSED;
|
|
|
|
if (len <= 0 || buf[0] != 0xf0)
|
|
return;
|
|
/* skip first byte */
|
|
buf++;
|
|
len--;
|
|
|
|
/* GM on */
|
|
if (len >= (int)sizeof(gm_on_macro) &&
|
|
memcmp(buf, gm_on_macro, sizeof(gm_on_macro)) == 0) {
|
|
if (chset->midi_mode != SNDRV_MIDI_MODE_GS &&
|
|
chset->midi_mode != SNDRV_MIDI_MODE_XG) {
|
|
chset->midi_mode = SNDRV_MIDI_MODE_GM;
|
|
reset_all_channels(chset);
|
|
parsed = SNDRV_MIDI_SYSEX_GM_ON;
|
|
}
|
|
}
|
|
|
|
/* GS macros */
|
|
else if (len >= 8 &&
|
|
memcmp(buf, gs_pfx_macro, sizeof(gs_pfx_macro)) == 0) {
|
|
if (chset->midi_mode != SNDRV_MIDI_MODE_GS &&
|
|
chset->midi_mode != SNDRV_MIDI_MODE_XG)
|
|
chset->midi_mode = SNDRV_MIDI_MODE_GS;
|
|
|
|
if (buf[5] == 0x00 && buf[6] == 0x7f && buf[7] == 0x00) {
|
|
/* GS reset */
|
|
parsed = SNDRV_MIDI_SYSEX_GS_RESET;
|
|
reset_all_channels(chset);
|
|
}
|
|
|
|
else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x15) {
|
|
/* drum pattern */
|
|
int p = get_channel(buf[5]);
|
|
if (p < chset->max_channels) {
|
|
parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL;
|
|
if (buf[7])
|
|
chset->channels[p].drum_channel = 1;
|
|
else
|
|
chset->channels[p].drum_channel = 0;
|
|
}
|
|
|
|
} else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x21) {
|
|
/* program */
|
|
int p = get_channel(buf[5]);
|
|
if (p < chset->max_channels &&
|
|
! chset->channels[p].drum_channel) {
|
|
parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL;
|
|
chset->channels[p].midi_program = buf[7];
|
|
}
|
|
|
|
} else if (buf[5] == 0x01 && buf[6] == 0x30) {
|
|
/* reverb mode */
|
|
parsed = SNDRV_MIDI_SYSEX_GS_REVERB_MODE;
|
|
chset->gs_reverb_mode = buf[7];
|
|
|
|
} else if (buf[5] == 0x01 && buf[6] == 0x38) {
|
|
/* chorus mode */
|
|
parsed = SNDRV_MIDI_SYSEX_GS_CHORUS_MODE;
|
|
chset->gs_chorus_mode = buf[7];
|
|
|
|
} else if (buf[5] == 0x00 && buf[6] == 0x04) {
|
|
/* master volume */
|
|
parsed = SNDRV_MIDI_SYSEX_GS_MASTER_VOLUME;
|
|
chset->gs_master_volume = buf[7];
|
|
|
|
}
|
|
}
|
|
|
|
/* XG on */
|
|
else if (len >= (int)sizeof(xg_on_macro) &&
|
|
memcmp(buf, xg_on_macro, sizeof(xg_on_macro)) == 0) {
|
|
int i;
|
|
chset->midi_mode = SNDRV_MIDI_MODE_XG;
|
|
parsed = SNDRV_MIDI_SYSEX_XG_ON;
|
|
/* reset CC#0 for drums */
|
|
for (i = 0; i < chset->max_channels; i++) {
|
|
if (chset->channels[i].drum_channel)
|
|
chset->channels[i].control[MIDI_CTL_MSB_BANK] = 127;
|
|
else
|
|
chset->channels[i].control[MIDI_CTL_MSB_BANK] = 0;
|
|
}
|
|
}
|
|
|
|
if (ops->sysex)
|
|
ops->sysex(private, buf - 1, len + 1, parsed, chset);
|
|
}
|
|
|
|
/*
|
|
* all sound off
|
|
*/
|
|
static void
|
|
all_sounds_off(const struct snd_midi_op *ops, void *drv,
|
|
struct snd_midi_channel *chan)
|
|
{
|
|
int n;
|
|
|
|
if (! ops->note_terminate)
|
|
return;
|
|
for (n = 0; n < 128; n++) {
|
|
if (chan->note[n]) {
|
|
ops->note_terminate(drv, n, chan);
|
|
chan->note[n] = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* all notes off
|
|
*/
|
|
static void
|
|
all_notes_off(const struct snd_midi_op *ops, void *drv,
|
|
struct snd_midi_channel *chan)
|
|
{
|
|
int n;
|
|
|
|
if (! ops->note_off)
|
|
return;
|
|
for (n = 0; n < 128; n++) {
|
|
if (chan->note[n] == SNDRV_MIDI_NOTE_ON)
|
|
note_off(ops, drv, chan, n, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialise a single midi channel control block.
|
|
*/
|
|
static void snd_midi_channel_init(struct snd_midi_channel *p, int n)
|
|
{
|
|
if (p == NULL)
|
|
return;
|
|
|
|
memset(p, 0, sizeof(struct snd_midi_channel));
|
|
p->private = NULL;
|
|
p->number = n;
|
|
|
|
snd_midi_reset_controllers(p);
|
|
p->gm_rpn_pitch_bend_range = 256; /* 2 semitones */
|
|
p->gm_rpn_fine_tuning = 0;
|
|
p->gm_rpn_coarse_tuning = 0;
|
|
|
|
if (n == 9)
|
|
p->drum_channel = 1; /* Default ch 10 as drums */
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialise a set of midi channel control blocks.
|
|
*/
|
|
static struct snd_midi_channel *snd_midi_channel_init_set(int n)
|
|
{
|
|
struct snd_midi_channel *chan;
|
|
int i;
|
|
|
|
chan = kmalloc_array(n, sizeof(struct snd_midi_channel), GFP_KERNEL);
|
|
if (chan) {
|
|
for (i = 0; i < n; i++)
|
|
snd_midi_channel_init(chan+i, i);
|
|
}
|
|
|
|
return chan;
|
|
}
|
|
|
|
/*
|
|
* reset all midi channels
|
|
*/
|
|
static void
|
|
reset_all_channels(struct snd_midi_channel_set *chset)
|
|
{
|
|
int ch;
|
|
for (ch = 0; ch < chset->max_channels; ch++) {
|
|
struct snd_midi_channel *chan = chset->channels + ch;
|
|
snd_midi_reset_controllers(chan);
|
|
chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */
|
|
chan->gm_rpn_fine_tuning = 0;
|
|
chan->gm_rpn_coarse_tuning = 0;
|
|
|
|
if (ch == 9)
|
|
chan->drum_channel = 1;
|
|
else
|
|
chan->drum_channel = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Allocate and initialise a midi channel set.
|
|
*/
|
|
struct snd_midi_channel_set *snd_midi_channel_alloc_set(int n)
|
|
{
|
|
struct snd_midi_channel_set *chset;
|
|
|
|
chset = kmalloc(sizeof(*chset), GFP_KERNEL);
|
|
if (chset) {
|
|
chset->channels = snd_midi_channel_init_set(n);
|
|
chset->private_data = NULL;
|
|
chset->max_channels = n;
|
|
}
|
|
return chset;
|
|
}
|
|
EXPORT_SYMBOL(snd_midi_channel_alloc_set);
|
|
|
|
/*
|
|
* Reset the midi controllers on a particular channel to default values.
|
|
*/
|
|
static void snd_midi_reset_controllers(struct snd_midi_channel *chan)
|
|
{
|
|
memset(chan->control, 0, sizeof(chan->control));
|
|
chan->gm_volume = 127;
|
|
chan->gm_expression = 127;
|
|
chan->gm_pan = 64;
|
|
}
|
|
|
|
|
|
/*
|
|
* Free a midi channel set.
|
|
*/
|
|
void snd_midi_channel_free_set(struct snd_midi_channel_set *chset)
|
|
{
|
|
if (chset == NULL)
|
|
return;
|
|
kfree(chset->channels);
|
|
kfree(chset);
|
|
}
|
|
EXPORT_SYMBOL(snd_midi_channel_free_set);
|