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rawmidi: Extensions for tied device and substream inactive flag

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This is the enhancements of rawmidi API for the new feature added in
6.14 kernel: the indication of a tied device and the inactive flag for
the selected substream.

The new function is added for obtaining the tied device,
snd_rawmidi_info_get_tied_device().

And the new bit flag is defined for indicating the inactive
substream, SNDRV_RAWMIDI_INFO_STREAM_INACTIVE, which is exposed via
snd_rawmidi_info_get_flags().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2025-01-13 15:24:11 +01:00
parent e1cf4d3f68
commit 137eca7720
2 changed files with 18 additions and 0 deletions
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2
include/rawmidi.h
View file

@ -95,6 +95,7 @@ typedef enum _snd_rawmidi_read_mode {
/** rawmidi info bit flags */
#define SND_RAWMIDI_INFO_UMP 0x00000008 /* rawmidi is UMP */
#define SNDRV_RAWMIDI_INFO_STREAM_INACTIVE 0x00000010 /* the selected substream is inactive */
int snd_rawmidi_open(snd_rawmidi_t **in_rmidi, snd_rawmidi_t **out_rmidi,
const char *name, int mode);
@ -124,6 +125,7 @@ const char *snd_rawmidi_info_get_name(const snd_rawmidi_info_t *obj);
const char *snd_rawmidi_info_get_subdevice_name(const snd_rawmidi_info_t *obj);
unsigned int snd_rawmidi_info_get_subdevices_count(const snd_rawmidi_info_t *obj);
unsigned int snd_rawmidi_info_get_subdevices_avail(const snd_rawmidi_info_t *obj);
int snd_rawmidi_info_get_tied_device(const snd_rawmidi_info_t *obj);
void snd_rawmidi_info_set_device(snd_rawmidi_info_t *obj, unsigned int val);
void snd_rawmidi_info_set_subdevice(snd_rawmidi_info_t *obj, unsigned int val);
void snd_rawmidi_info_set_stream(snd_rawmidi_info_t *obj, snd_rawmidi_stream_t val);

16
src/rawmidi/rawmidi.c
View file

@ -639,6 +639,22 @@ unsigned int snd_rawmidi_info_get_subdevices_avail(const snd_rawmidi_info_t *inf
return info->subdevices_avail;
}
/**
* \brief get the tied device number for the given rawmidi device
* \param info pointer to a snd_rawmidi_info_t structure
* \return the device number for the tied device, or -1 if untied / unknown.
*
* This function is useful for UMP rawmidi devices where each of them may
* have the mirroring legacy rawmidi device. Those are shown as "tied".
*/
int snd_rawmidi_info_get_tied_device(const snd_rawmidi_info_t *info)
{
assert(info);
if (info->tied_device > 0)
return info->tied_device - 1;
return -1;
}
/**
* \brief set rawmidi device number
* \param info pointer to a snd_rawmidi_info_t structure