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seq: Simplify snd_seq_extract_output()

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Now that we never put UMP events on the output buffer in the legacy
mode, the check and skip of UMP events are no longer necessary.
It means that ump_allowed argument is meaningless in extract_output(),
too.

Let's drop the unnecessary check and move the code extract_output()
into snd_seq_extract_output() again, and call this directly from
snd_seq_ump_extract_output() for simplification.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-11-06 16:33:59 +01:00
parent 2fca03e792
commit 94a5ddff9d
1 changed files with 20 additions and 32 deletions
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52
src/seq/seq.c
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@ -4308,36 +4308,6 @@ int snd_seq_drain_output(snd_seq_t *seq)
return 0;
}
static int extract_output(snd_seq_t *seq, snd_seq_event_t **ev_res, int ump_allowed)
{
size_t len, olen;
assert(seq);
if (ev_res)
*ev_res = NULL;
repeat:
if ((olen = seq->obufused) < sizeof(snd_seq_event_t))
return -ENOENT;
len = snd_seq_event_length((snd_seq_event_t *)seq->obuf);
if (olen < len)
return -ENOENT;
/* skip invalid UMP events */
if (snd_seq_ev_is_ump((snd_seq_event_t *)seq->obuf) && !ump_allowed) {
seq->obufused -= len;
memmove(seq->obuf, seq->obuf + len, seq->obufused);
goto repeat;
}
if (ev_res) {
/* extract the event */
if (alloc_tmpbuf(seq, len) < 0)
return -ENOMEM;
memcpy(seq->tmpbuf, seq->obuf, len);
*ev_res = (snd_seq_event_t *)seq->tmpbuf;
}
seq->obufused = olen - len;
memmove(seq->obuf, seq->obuf + len, seq->obufused);
return 0;
}
/**
* \brief extract the first event in output buffer
* \param seq sequencer handle
@ -4351,7 +4321,25 @@ static int extract_output(snd_seq_t *seq, snd_seq_event_t **ev_res, int ump_allo
*/
int snd_seq_extract_output(snd_seq_t *seq, snd_seq_event_t **ev_res)
{
return extract_output(seq, ev_res, 0);
size_t len, olen;
assert(seq);
if (ev_res)
*ev_res = NULL;
if ((olen = seq->obufused) < sizeof(snd_seq_event_t))
return -ENOENT;
len = snd_seq_event_length((snd_seq_event_t *)seq->obuf);
if (olen < len)
return -ENOENT;
if (ev_res) {
/* extract the event */
if (alloc_tmpbuf(seq, len) < 0)
return -ENOMEM;
memcpy(seq->tmpbuf, seq->obuf, len);
*ev_res = (snd_seq_event_t *)seq->tmpbuf;
}
seq->obufused = olen - len;
memmove(seq->obuf, seq->obuf + len, seq->obufused);
return 0;
}
/*----------------------------------------------------------------*/
@ -4547,7 +4535,7 @@ int snd_seq_ump_extract_output(snd_seq_t *seq, snd_seq_ump_event_t **ev_res)
{
if (!seq->midi_version)
return -EBADFD;
return extract_output(seq, (snd_seq_event_t **)ev_res, 1);
return snd_seq_extract_output(seq, (snd_seq_event_t **)ev_res);
}
/**