mirrors/alsa-lib
1
0
Fork 0
mirror of https://github.com/alsa-project/alsa-lib.git synced 2025-10-29 05:40:25 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Reverted back (N)RPN decoding - it is difficult to do this job here

Browse source
This commit is contained in:
Jaroslav Kysela 2003-06-16 18:53:25 +00:00
parent 8f78ae3b84
commit ea8feb43e2
1 changed files with 8 additions and 86 deletions
Download patch file Download diff file Expand all files Collapse all files

94
src/seq/seq_midi_event.c
View file

@ -35,12 +35,11 @@
/* midi status */
struct snd_midi_event {
size_t qlen; /* queue length */
size_t read; /* chars read */
int type; /* current event type */
size_t qlen; /* queue length */
size_t read; /* chars read */
int type; /* current event type */
unsigned char lastcmd;
unsigned char nostat;
unsigned char xreg_hit;
size_t bufsize;
unsigned char *buf; /* input buffer */
};
@ -50,11 +49,9 @@ struct snd_midi_event {
/* from 0 to 7 are normal commands (note off, on, etc.) */
#define ST_NOTEOFF 0
#define ST_NOTEON 1
#define ST_CONTROLLER 3
#define ST_SPECIAL 8
#define ST_SYSEX ST_SPECIAL
/* from 8 to 15 are events for 0xf0-0xf7 */
#define ST_XREG_PARM 16
/* status event types */
@ -72,8 +69,6 @@ static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
static unsigned char get_xreg_hit_bit(unsigned char c);
static void xreg_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
static void note_decode(snd_seq_event_t *ev, unsigned char *buf);
static void one_param_decode(snd_seq_event_t *ev, unsigned char *buf);
static void pitchbend_decode(snd_seq_event_t *ev, unsigned char *buf);
@ -305,7 +300,7 @@ long snd_midi_event_encode(snd_midi_event_t *dev, unsigned char *buf, long count
*/
int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev)
{
int tmp = 0;
int rc = 0;
c &= 0xff;
@ -319,20 +314,11 @@ int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev
if (dev->qlen > 0) {
/* rest of command */
if (c & 0x80) { /* error? state inside data? */
if (dev->type == ST_XREG_PARM) {
if (c != dev->buf[0])
goto __new_command;
return 0;
}
goto __new_command;
}
dev->buf[dev->read++] = c;
if (dev->type != ST_SYSEX)
dev->qlen--;
} else {
/* new command */
__new_command:
dev->read = 1;
if (c & 0x80) {
dev->buf[0] = c;
@ -348,39 +334,13 @@ int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev
}
}
if (dev->qlen == 0) {
/* handle xrpn special case here */
if (dev->type == ST_CONTROLLER &&
dev->buf[1] >= MIDI_CTL_NONREG_PARM_NUM_LSB &&
dev->buf[1] <= MIDI_CTL_REGIST_PARM_NUM_MSB) {
dev->type = ST_XREG_PARM;
dev->xreg_hit = get_xreg_hit_bit(dev->buf[1]);
dev->qlen = 2; /* we need more bytes */
return 0;
}
if (dev->type == ST_XREG_PARM) {
tmp = get_xreg_hit_bit(dev->buf[1]);
if (tmp == 0 || (tmp & dev->xreg_hit)) {
reset_encode(dev);
dev->type = ST_CONTROLLER;
dev->read = 1;
return 0;
}
dev->xreg_hit |= tmp;
if (dev->xreg_hit == 0x0f) { /* finished */
xreg_event(dev, ev);
return 1;
}
dev->qlen = 2; /* we need more bytes */
return 0;
}
/* handle standard midi events */
ev->type = status_event[dev->type].event;
ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
if (status_event[dev->type].encode) /* set data values */
status_event[dev->type].encode(dev, ev);
return 1;
} else if (dev->type == ST_SYSEX) {
rc = 1;
} else if (dev->type == ST_SYSEX) {
if (c == MIDI_CMD_COMMON_SYSEX_END ||
dev->read >= dev->bufsize) {
ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
@ -392,11 +352,11 @@ int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev
dev->read = 0; /* continue to parse */
else
reset_encode(dev); /* all parsed */
return 1;
rc = 1;
}
}
return 0;
return rc;
}
/* encode note event */
@ -441,44 +401,6 @@ static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
}
static unsigned char get_xreg_hit_bit(unsigned char c)
{
switch (c) {
case MIDI_CTL_NONREG_PARM_NUM_MSB:
case MIDI_CTL_REGIST_PARM_NUM_MSB:
return 1;
case MIDI_CTL_NONREG_PARM_NUM_LSB:
case MIDI_CTL_REGIST_PARM_NUM_LSB:
return 2;
case MIDI_CTL_MSB_DATA_ENTRY:
return 4;
case MIDI_CTL_LSB_DATA_ENTRY:
return 8;
default:
return 0;
}
}
/* encode xreg event */
static void xreg_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
{
int i;
ev->type = (dev->buf[1] == MIDI_CTL_NONREG_PARM_NUM_MSB ||
dev->buf[1] == MIDI_CTL_NONREG_PARM_NUM_LSB) ?
SND_SEQ_EVENT_NONREGPARAM : SND_SEQ_EVENT_REGPARAM;
ev->data.control.param = 0;
ev->data.control.value = 0;
for (i = 1; i < 9; i += 2) {
switch (get_xreg_hit_bit(dev->buf[i])) {
case 1: ev->data.control.param |= dev->buf[i+1] << 7; break;
case 2: ev->data.control.param |= dev->buf[i+1]; break;
case 4: ev->data.control.value |= dev->buf[i+1] << 7; break;
case 8: ev->data.control.value |= dev->buf[i+1]; break;
}
}
}
/**
* \brief Decode sequencer event to MIDI byte stream
* \param dev MIDI event parser