mirror of
https://github.com/alsa-project/alsa-lib.git
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Added sequencer event <-> MIDI byte stream coder from the kernel space
This commit is contained in:
Jaroslav Kysela
parent
867ad7b2bc
commit
e0acbbfef8
4 changed files with 479 additions and 3 deletions
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@ -4,8 +4,8 @@ sysinclude_HEADERS = asoundlib.h
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# This is the order they will be concatenated into asoundlib.h!
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#
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header_files=header.h version.h global.h error.h control.h mixer.h pcm.h \
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rawmidi.h timer.h hwdep.h seq.h seqmid.h conv.h instr.h conf.h \
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footer.h
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rawmidi.h timer.h hwdep.h seq.h seqmid.h seq_midi_event.h \
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conv.h instr.h conf.h footer.h
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noinst_HEADERS=$(header_files) search.h list.h aserver.h
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28
include/seq_midi_event.h
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28
include/seq_midi_event.h
Normal file
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@ -0,0 +1,28 @@
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/****************************************************************************
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* *
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* Sequencer event <-> MIDI byte stream coder *
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* *
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****************************************************************************/
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct snd_midi_event snd_midi_event_t;
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int snd_midi_event_new(int bufsize, snd_midi_event_t **rdev);
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int snd_midi_event_resize_buffer(snd_midi_event_t *dev, int bufsize);
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void snd_midi_event_free(snd_midi_event_t *dev);
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void snd_midi_event_init(snd_midi_event_t *dev);
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void snd_midi_event_reset_encode(snd_midi_event_t *dev);
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void snd_midi_event_reset_decode(snd_midi_event_t *dev);
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/* encode from byte stream - return number of written bytes if success */
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long snd_midi_event_encode(snd_midi_event_t *dev, unsigned char *buf, long count, snd_seq_event_t *ev);
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int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev);
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/* decode from event to bytes - return number of written bytes if success */
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long snd_midi_event_decode(snd_midi_event_t *dev, unsigned char *buf, long count, snd_seq_event_t *ev);
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#ifdef __cplusplus
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}
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#endif
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@ -1,6 +1,6 @@
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EXTRA_LTLIBRARIES=libseq.la
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libseq_la_SOURCES = seq_hw.c seq.c seqmid.c
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libseq_la_SOURCES = seq_hw.c seq.c seqmid.c seq_midi_event.c
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noinst_HEADERS = seq_local.h
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all: libseq.la
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448
src/seq/seq_midi_event.c
Normal file
448
src/seq/seq_midi_event.c
Normal file
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@ -0,0 +1,448 @@
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/*
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* MIDI byte <-> sequencer event coder
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*
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* Copyright (C) 1998,99,2000 Takashi Iwai <tiwai@suse.de>,
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* Jaroslav Kysela <perex@suse.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <malloc.h>
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#include <errno.h>
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#include "asoundlib.h"
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/* midi status */
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struct snd_midi_event {
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int qlen; /* queue length */
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int read; /* chars read */
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int type; /* current event type */
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unsigned char lastcmd;
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int bufsize;
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unsigned char *buf; /* input buffer */
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};
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/* queue type */
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/* from 0 to 7 are normal commands (note off, on, etc.) */
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#define ST_NOTEOFF 0
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#define ST_NOTEON 1
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#define ST_SPECIAL 8
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#define ST_SYSEX ST_SPECIAL
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/* from 8 to 15 are events for 0xf0-0xf7 */
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/* status event types */
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typedef void (*event_encode_t)(snd_midi_event_t *dev, snd_seq_event_t *ev);
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typedef void (*event_decode_t)(snd_seq_event_t *ev, unsigned char *buf);
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/*
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* prototypes
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*/
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static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
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static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
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static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
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static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
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static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
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static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
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static void note_decode(snd_seq_event_t *ev, unsigned char *buf);
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static void one_param_decode(snd_seq_event_t *ev, unsigned char *buf);
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static void pitchbend_decode(snd_seq_event_t *ev, unsigned char *buf);
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static void two_param_decode(snd_seq_event_t *ev, unsigned char *buf);
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static void songpos_decode(snd_seq_event_t *ev, unsigned char *buf);
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/*
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* event list
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*/
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static struct status_event_list_t {
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int event;
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int qlen;
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event_encode_t encode;
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event_decode_t decode;
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} status_event[] = {
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/* 0x80 - 0xf0 */
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{SND_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
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{SND_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
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{SND_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
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{SND_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
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{SND_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
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{SND_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
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{SND_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
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{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf0 */
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/* 0xf0 - 0xff */
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{SND_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
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{SND_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
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{SND_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
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{SND_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
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{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf4 */
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{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf5 */
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{SND_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
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{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf7 */
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{SND_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
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{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf9 */
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{SND_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
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{SND_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
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{SND_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
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{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xfd */
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{SND_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
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{SND_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
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};
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static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int len, snd_seq_event_t *ev);
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static struct extra_event_list_t {
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int event;
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int (*decode)(snd_midi_event_t *dev, unsigned char *buf, int len, snd_seq_event_t *ev);
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} extra_event[] = {
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{SND_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
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/*{SND_SEQ_EVENT_NONREGPARAM, extra_decode_nrpn},*/
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/*{SND_SEQ_EVENT_REGPARAM, extra_decode_rpn},*/
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};
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#define numberof(ary) (sizeof(ary)/sizeof(ary[0]))
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/*
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* new/delete record
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*/
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int snd_midi_event_new(int bufsize, snd_midi_event_t **rdev)
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{
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snd_midi_event_t *dev;
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*rdev = NULL;
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dev = (snd_midi_event_t *)malloc(sizeof(snd_midi_event_t));
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if (dev == NULL)
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return -ENOMEM;
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if (bufsize > 0) {
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dev->buf = malloc(bufsize);
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if (dev->buf == NULL) {
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free(dev);
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return -ENOMEM;
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}
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}
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dev->bufsize = bufsize;
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*rdev = dev;
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return 0;
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}
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void snd_midi_event_free(snd_midi_event_t *dev)
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{
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if (dev != NULL) {
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if (dev->buf)
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free(dev->buf);
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free(dev);
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}
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}
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/*
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* initialize record
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*/
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inline static void reset_encode(snd_midi_event_t *dev)
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{
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dev->read = 0;
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dev->qlen = 0;
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dev->type = 0;
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}
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void snd_midi_event_reset_encode(snd_midi_event_t *dev)
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{
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reset_encode(dev);
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}
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void snd_midi_event_reset_decode(snd_midi_event_t *dev)
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{
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dev->lastcmd = 0xff;
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}
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void snd_midi_event_init(snd_midi_event_t *dev)
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{
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snd_midi_event_reset_encode(dev);
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snd_midi_event_reset_decode(dev);
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}
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/*
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* resize buffer
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*/
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int snd_midi_event_resize_buffer(snd_midi_event_t *dev, int bufsize)
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{
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unsigned char *new_buf, *old_buf;
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if (bufsize == dev->bufsize)
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return 0;
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new_buf = malloc(bufsize);
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if (new_buf == NULL)
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return -ENOMEM;
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old_buf = dev->buf;
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dev->buf = new_buf;
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dev->bufsize = bufsize;
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reset_encode(dev);
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if (old_buf)
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free(old_buf);
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return 0;
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}
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/*
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* read bytes and encode to sequencer event if finished
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* return the size of encoded bytes
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*/
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long snd_midi_event_encode(snd_midi_event_t *dev, unsigned char *buf, long count, snd_seq_event_t *ev)
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{
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long result = 0;
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int rc;
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ev->type = SND_SEQ_EVENT_NONE;
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while (count-- > 0) {
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rc = snd_midi_event_encode_byte(dev, *buf++, ev);
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result++;
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if (rc < 0)
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return rc;
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else if (rc > 0)
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return result;
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}
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return result;
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}
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/*
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* read one byte and encode to sequencer event:
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* return 1 if MIDI bytes are encoded to an event
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* 0 data is not finished
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* negative for error
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*/
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int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev)
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{
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int rc = 0;
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c &= 0xff;
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if (c >= SND_MCMD_COMMON_CLOCK) {
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/* real-time event */
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ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
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ev->flags &= ~SND_SEQ_EVENT_LENGTH_MASK;
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ev->flags |= SND_SEQ_EVENT_LENGTH_FIXED;
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return 1;
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}
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if (dev->qlen > 0) {
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/* rest of command */
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dev->buf[dev->read++] = c;
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if (dev->type != ST_SYSEX)
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dev->qlen--;
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} else {
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/* new command */
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dev->read = 1;
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if (c & 0x80) {
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dev->buf[0] = c;
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if ((c & 0xf0) == 0xf0) /* special events */
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dev->type = (c & 0x0f) + ST_SPECIAL;
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else
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dev->type = (c >> 4) & 0x07;
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dev->qlen = status_event[dev->type].qlen;
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} else {
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/* process this byte as argument */
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dev->buf[dev->read++] = c;
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dev->qlen = status_event[dev->type].qlen - 1;
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}
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}
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if (dev->qlen == 0) {
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ev->type = status_event[dev->type].event;
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ev->flags &= ~SND_SEQ_EVENT_LENGTH_MASK;
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ev->flags |= SND_SEQ_EVENT_LENGTH_FIXED;
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if (status_event[dev->type].encode) /* set data values */
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status_event[dev->type].encode(dev, ev);
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rc = 1;
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} else if (dev->type == ST_SYSEX) {
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if (c == SND_MCMD_COMMON_SYSEX_END ||
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dev->read >= dev->bufsize) {
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ev->flags &= ~SND_SEQ_EVENT_LENGTH_MASK;
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ev->flags |= SND_SEQ_EVENT_LENGTH_VARIABLE;
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ev->data.ext.len = dev->read;
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ev->data.ext.ptr = dev->buf;
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if (c != SND_MCMD_COMMON_SYSEX_END)
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dev->read = 0; /* continue to parse */
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else
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reset_encode(dev); /* all parsed */
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rc = 1;
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}
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}
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return rc;
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}
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/* encode note event */
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static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
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{
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ev->data.note.channel = dev->buf[0] & 0x0f;
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ev->data.note.note = dev->buf[1];
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ev->data.note.velocity = dev->buf[2];
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}
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/* encode one parameter controls */
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static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
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{
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ev->data.control.channel = dev->buf[0] & 0x0f;
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ev->data.control.value = dev->buf[1];
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}
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/* encode pitch wheel change */
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static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
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{
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ev->data.control.channel = dev->buf[0] & 0x0f;
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ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
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}
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/* encode midi control change */
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static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
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{
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ev->data.control.channel = dev->buf[0] & 0x0f;
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ev->data.control.param = dev->buf[1];
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ev->data.control.value = dev->buf[2];
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}
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/* encode one parameter value*/
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static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
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{
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ev->data.control.value = dev->buf[1];
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}
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/* encode song position */
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static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
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{
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ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
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}
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/*
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* decode from a sequencer event to midi bytes
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* return the size of decoded midi events
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*/
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long snd_midi_event_decode(snd_midi_event_t *dev, unsigned char *buf, long count, snd_seq_event_t *ev)
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{
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int cmd;
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long qlen;
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unsigned int type;
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if (ev->type == SND_SEQ_EVENT_NONE)
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return -ENOENT;
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for (type = 0; type < numberof(status_event); type++) {
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if (ev->type == status_event[type].event)
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goto __found;
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}
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for (type = 0; type < numberof(extra_event); type++) {
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if (ev->type == extra_event[type].event)
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return extra_event[type].decode(dev, buf, count, ev);
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}
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return -ENOENT;
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__found:
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if (type >= ST_SPECIAL)
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cmd = 0xf0 + (type - ST_SPECIAL);
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else
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/* data.note.channel and data.control.channel is identical */
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cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
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if (cmd == SND_MCMD_COMMON_SYSEX) {
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qlen = ev->data.ext.len;
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if (count < qlen)
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return -ENOMEM;
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switch (ev->flags & SND_SEQ_EVENT_LENGTH_MASK) {
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case SND_SEQ_EVENT_LENGTH_FIXED:
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case SND_SEQ_EVENT_LENGTH_VARIPC:
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return -EINVAL; /* invalid event */
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}
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memcpy(dev->buf, ev->data.ext.ptr, qlen);
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return qlen;
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} else {
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unsigned char xbuf[4];
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if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd) {
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dev->lastcmd = cmd;
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xbuf[0] = cmd;
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if (status_event[type].decode)
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status_event[type].decode(ev, xbuf + 1);
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qlen = status_event[type].qlen + 1;
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} else {
|
||||
if (status_event[type].decode)
|
||||
status_event[type].decode(ev, xbuf + 0);
|
||||
qlen = status_event[type].qlen;
|
||||
}
|
||||
if (count < qlen)
|
||||
return -ENOMEM;
|
||||
memcpy(buf, xbuf, qlen);
|
||||
return qlen;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/* decode note event */
|
||||
static void note_decode(snd_seq_event_t *ev, unsigned char *buf)
|
||||
{
|
||||
buf[0] = ev->data.note.note & 0x7f;
|
||||
buf[1] = ev->data.note.velocity & 0x7f;
|
||||
}
|
||||
|
||||
/* decode one parameter controls */
|
||||
static void one_param_decode(snd_seq_event_t *ev, unsigned char *buf)
|
||||
{
|
||||
buf[0] = ev->data.control.value & 0x7f;
|
||||
}
|
||||
|
||||
/* decode pitch wheel change */
|
||||
static void pitchbend_decode(snd_seq_event_t *ev, unsigned char *buf)
|
||||
{
|
||||
int value = ev->data.control.value + 8192;
|
||||
buf[0] = value & 0x7f;
|
||||
buf[1] = (value >> 7) & 0x7f;
|
||||
}
|
||||
|
||||
/* decode midi control change */
|
||||
static void two_param_decode(snd_seq_event_t *ev, unsigned char *buf)
|
||||
{
|
||||
buf[0] = ev->data.control.param & 0x7f;
|
||||
buf[1] = ev->data.control.value & 0x7f;
|
||||
}
|
||||
|
||||
/* decode song position */
|
||||
static void songpos_decode(snd_seq_event_t *ev, unsigned char *buf)
|
||||
{
|
||||
buf[0] = ev->data.control.value & 0x7f;
|
||||
buf[1] = (ev->data.control.value >> 7) & 0x7f;
|
||||
}
|
||||
|
||||
/* decode 14bit control */
|
||||
static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int count, snd_seq_event_t *ev)
|
||||
{
|
||||
if (ev->data.control.param < 32) {
|
||||
if (count < 5)
|
||||
return -ENOMEM;
|
||||
buf[0] = SND_MCMD_CONTROL|(ev->data.control.channel & 0x0f);
|
||||
buf[1] = ev->data.control.param;
|
||||
buf[2] = (ev->data.control.value >> 7) & 0x7f;
|
||||
buf[3] = ev->data.control.param + 32;
|
||||
buf[4] = ev->data.control.value & 0x7f;
|
||||
dev->lastcmd = buf[0];
|
||||
return 5;
|
||||
} else {
|
||||
if (count < 3)
|
||||
return -ENOMEM;
|
||||
buf[0] = SND_MCMD_CONTROL|(ev->data.control.channel & 0x0f);
|
||||
buf[1] = ev->data.control.param & 0x7f;
|
||||
buf[4] = ev->data.control.value & 0x7f;
|
||||
dev->lastcmd = buf[0];
|
||||
return 3;
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue