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amidi: fix port listing

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Rewrite the port listing code because it was too complex and had some
bugs when handling write-only or read-only ports.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2010-01-25 14:11:37 +01:00
parent 55cd025f18
commit c2eaf88f7e
1 changed files with 36 additions and 95 deletions
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121
amidi/amidi.c
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@ -95,122 +95,63 @@ static void *my_malloc(size_t size)
return p; return p;
} }
static int is_input(snd_ctl_t *ctl, int card, int device, int sub)
{
snd_rawmidi_info_t *info;
int err;
snd_rawmidi_info_alloca(&info);
snd_rawmidi_info_set_device(info, device);
snd_rawmidi_info_set_subdevice(info, sub);
snd_rawmidi_info_set_stream(info, SND_RAWMIDI_STREAM_INPUT);
if ((err = snd_ctl_rawmidi_info(ctl, info)) < 0 && err != -ENXIO)
return err;
else if (err == 0)
return 1;
return 0;
}
static int is_output(snd_ctl_t *ctl, int card, int device, int sub)
{
snd_rawmidi_info_t *info;
int err;
snd_rawmidi_info_alloca(&info);
snd_rawmidi_info_set_device(info, device);
snd_rawmidi_info_set_subdevice(info, sub);
snd_rawmidi_info_set_stream(info, SND_RAWMIDI_STREAM_OUTPUT);
if ((err = snd_ctl_rawmidi_info(ctl, info)) < 0 && err != -ENXIO)
return err;
else if (err == 0)
return 1;
return 0;
}
static void list_device(snd_ctl_t *ctl, int card, int device) static void list_device(snd_ctl_t *ctl, int card, int device)
{ {
snd_rawmidi_info_t *info; snd_rawmidi_info_t *info;
const char *name; const char *name;
const char *sub_name; const char *sub_name;
int subs, subs_in, subs_out; int subs, subs_in, subs_out;
int sub, in, out; int sub;
int err; int err;
snd_rawmidi_info_alloca(&info); snd_rawmidi_info_alloca(&info);
snd_rawmidi_info_set_device(info, device); snd_rawmidi_info_set_device(info, device);
snd_rawmidi_info_set_stream(info, SND_RAWMIDI_STREAM_INPUT); snd_rawmidi_info_set_stream(info, SND_RAWMIDI_STREAM_INPUT);
snd_ctl_rawmidi_info(ctl, info); err = snd_ctl_rawmidi_info(ctl, info);
if (err >= 0)
subs_in = snd_rawmidi_info_get_subdevices_count(info); subs_in = snd_rawmidi_info_get_subdevices_count(info);
else
subs_in = 0;
snd_rawmidi_info_set_stream(info, SND_RAWMIDI_STREAM_OUTPUT); snd_rawmidi_info_set_stream(info, SND_RAWMIDI_STREAM_OUTPUT);
snd_ctl_rawmidi_info(ctl, info); err = snd_ctl_rawmidi_info(ctl, info);
if (err >= 0)
subs_out = snd_rawmidi_info_get_subdevices_count(info); subs_out = snd_rawmidi_info_get_subdevices_count(info);
else
subs_out = 0;
subs = subs_in > subs_out ? subs_in : subs_out; subs = subs_in > subs_out ? subs_in : subs_out;
if (!subs)
sub = 0;
in = out = 0;
if ((err = is_output(ctl, card, device, sub)) < 0) {
error("cannot get rawmidi information %d:%d: %s",
card, device, snd_strerror(err));
return; return;
} else if (err)
out = 1;
if (err == 0) { for (sub = 0; sub < subs; ++sub) {
if ((err = is_input(ctl, card, device, sub)) < 0) { snd_rawmidi_info_set_stream(info, sub < subs_in ?
error("cannot get rawmidi information %d:%d: %s", SND_RAWMIDI_STREAM_INPUT :
card, device, snd_strerror(err)); SND_RAWMIDI_STREAM_OUTPUT);
snd_rawmidi_info_set_subdevice(info, sub);
err = snd_ctl_rawmidi_info(ctl, info);
if (err < 0) {
error("cannot get rawmidi information %d:%d:%d: %s\n",
card, device, sub, snd_strerror(err));
return; return;
} }
} else if (err)
in = 1;
if (err == 0)
return;
name = snd_rawmidi_info_get_name(info); name = snd_rawmidi_info_get_name(info);
sub_name = snd_rawmidi_info_get_subdevice_name(info); sub_name = snd_rawmidi_info_get_subdevice_name(info);
if (sub_name[0] == '\0') { if (sub == 0 && sub_name[0] == '\0') {
if (subs == 1) { printf("%c%c hw:%d,%d %s",
printf("%c%c hw:%d,%d %s\n", sub < subs_in ? 'I' : ' ',
in ? 'I' : ' ', out ? 'O' : ' ', sub < subs_out ? 'O' : ' ',
card, device, name); card, device, name);
} else if (subs > 1)
printf("%c%c hw:%d,%d %s (%d subdevices)\n", printf(" (%d subdevices)", subs);
in ? 'I' : ' ', out ? 'O' : ' ', putchar('\n');
card, device, name, subs); break;
} else { } else {
sub = 0;
for (;;) {
printf("%c%c hw:%d,%d,%d %s\n", printf("%c%c hw:%d,%d,%d %s\n",
in ? 'I' : ' ', out ? 'O' : ' ', sub < subs_in ? 'I' : ' ',
sub < subs_out ? 'O' : ' ',
card, device, sub, sub_name); card, device, sub, sub_name);
if (++sub >= subs)
break;
in = is_input(ctl, card, device, sub);
out = is_output(ctl, card, device, sub);
snd_rawmidi_info_set_subdevice(info, sub);
if (out) {
snd_rawmidi_info_set_stream(info, SND_RAWMIDI_STREAM_OUTPUT);
if ((err = snd_ctl_rawmidi_info(ctl, info)) < 0) {
error("cannot get rawmidi information %d:%d:%d: %s",
card, device, sub, snd_strerror(err));
break;
}
} else {
snd_rawmidi_info_set_stream(info, SND_RAWMIDI_STREAM_INPUT);
if ((err = snd_ctl_rawmidi_info(ctl, info)) < 0) {
error("cannot get rawmidi information %d:%d:%d: %s",
card, device, sub, snd_strerror(err));
break;
}
}
sub_name = snd_rawmidi_info_get_subdevice_name(info);
} }
} }
} }