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ALSA: seq: Minor cleanup of MIDI event parser helpers

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snd_midi_event_encode_byte() can never fail, and it can return rather
true/false.  Change the return type to bool, adjust the argument to
receive a MIDI byte as unsigned char, and adjust the comment
accordingly.  This allows callers to drop error checks, which
simplifies the code.

Meanwhile, snd_midi_event_encode() helper is used only in seq_midi.c,
and it can be better folded into it.  This will reduce the total
amount of lines in the end.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2018-08-01 14:38:18 +02:00
parent d5e77fca87
commit ef965ad5a7
5 changed files with 22 additions and 56 deletions
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4
include/sound/seq_midi_event.h
View File

@ -43,10 +43,8 @@ void snd_midi_event_free(struct snd_midi_event *dev);
void snd_midi_event_reset_encode(struct snd_midi_event *dev);
void snd_midi_event_reset_decode(struct snd_midi_event *dev);
void snd_midi_event_no_status(struct snd_midi_event *dev, int on);
/* encode from byte stream - return number of written bytes if success */
long snd_midi_event_encode(struct snd_midi_event *dev, unsigned char *buf, long count,
bool snd_midi_event_encode_byte(struct snd_midi_event *dev, unsigned char c,
struct snd_seq_event *ev);
int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c, struct snd_seq_event *ev);
/* decode from event to bytes - return number of written bytes if success */
long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
struct snd_seq_event *ev);

2
sound/core/seq/oss/seq_oss_midi.c
View File

@ -637,7 +637,7 @@ snd_seq_oss_midi_putc(struct seq_oss_devinfo *dp, int dev, unsigned char c, stru
if ((mdev = get_mididev(dp, dev)) == NULL)
return -ENODEV;
if (snd_midi_event_encode_byte(mdev->coder, c, ev) > 0) {
if (snd_midi_event_encode_byte(mdev->coder, c, ev)) {
snd_seq_oss_fill_addr(dp, ev, mdev->client, mdev->port);
snd_use_lock_free(&mdev->use_lock);
return 0;

14
sound/core/seq/seq_midi.c
View File

@ -78,7 +78,7 @@ static void snd_midi_input_event(struct snd_rawmidi_substream *substream)
struct seq_midisynth *msynth;
struct snd_seq_event ev;
char buf[16], *pbuf;
long res, count;
long res;
if (substream == NULL)
return;
@ -94,13 +94,10 @@ static void snd_midi_input_event(struct snd_rawmidi_substream *substream)
if (msynth->parser == NULL)
continue;
pbuf = buf;
while (res > 0) {
count = snd_midi_event_encode(msynth->parser, pbuf, res, &ev);
if (count < 0)
break;
pbuf += count;
res -= count;
if (ev.type != SNDRV_SEQ_EVENT_NONE) {
while (res-- > 0) {
if (!snd_midi_event_encode_byte(msynth->parser,
*pbuf++, &ev))
continue;
ev.source.port = msynth->seq_port;
ev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
snd_seq_kernel_client_dispatch(msynth->seq_client, &ev, 1, 0);
@ -108,7 +105,6 @@ static void snd_midi_input_event(struct snd_rawmidi_substream *substream)
memset(&ev, 0, sizeof(ev));
}
}
}
}
static int dump_midi(struct snd_rawmidi_substream *substream, const char *buf, int count)

40
sound/core/seq/seq_midi_event.c
View File

@ -214,45 +214,17 @@ int snd_midi_event_resize_buffer(struct snd_midi_event *dev, int bufsize)
}
#endif /* 0 */
/*
* read bytes and encode to sequencer event if finished
* return the size of encoded bytes
*/
long snd_midi_event_encode(struct snd_midi_event *dev, unsigned char *buf, long count,
struct snd_seq_event *ev)
{
long result = 0;
int rc;
ev->type = SNDRV_SEQ_EVENT_NONE;
while (count-- > 0) {
rc = snd_midi_event_encode_byte(dev, *buf++, ev);
result++;
if (rc < 0)
return rc;
else if (rc > 0)
return result;
}
return result;
}
EXPORT_SYMBOL(snd_midi_event_encode);
/*
* read one byte and encode to sequencer event:
* return 1 if MIDI bytes are encoded to an event
* 0 data is not finished
* negative for error
* return true if MIDI bytes are encoded to an event
* false data is not finished
*/
int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
bool snd_midi_event_encode_byte(struct snd_midi_event *dev, unsigned char c,
struct snd_seq_event *ev)
{
int rc = 0;
bool rc = false;
unsigned long flags;
c &= 0xff;
if (c >= MIDI_CMD_COMMON_CLOCK) {
/* real-time event */
ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
@ -293,7 +265,7 @@ int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
status_event[dev->type].encode(dev, ev);
if (dev->type >= ST_SPECIAL)
dev->type = ST_INVALID;
rc = 1;
rc = true;
} else if (dev->type == ST_SYSEX) {
if (c == MIDI_CMD_COMMON_SYSEX_END ||
dev->read >= dev->bufsize) {
@ -306,7 +278,7 @@ int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
dev->read = 0; /* continue to parse */
else
reset_encode(dev); /* all parsed */
rc = 1;
rc = true;
}
}

4
sound/core/seq/seq_virmidi.c
View File

@ -174,8 +174,8 @@ static void snd_vmidi_output_work(struct work_struct *work)
while (READ_ONCE(vmidi->trigger)) {
if (snd_rawmidi_transmit(substream, &input, 1) != 1)
break;
if (snd_midi_event_encode_byte(vmidi->parser, input,
&vmidi->event) <= 0)
if (!snd_midi_event_encode_byte(vmidi->parser, input,
&vmidi->event))
continue;
if (vmidi->event.type != SNDRV_SEQ_EVENT_NONE) {
ret = snd_seq_kernel_client_dispatch(vmidi->client,