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Information about a mixer's filters
typedef struct snd_mixer_filter { uint32_t enable; /* bitfield of 1 << SND_MIXER_READ_* */ uint8_t reserved[124]; /* must be filled with zero */ } snd_mixer_filter_t;
The snd_mixer_filter_t structure describes the filters for a mixer. You can call snd_mixer_set_filter() to specify the events you want to track, and snd_mixer_get_filter() to determine which you're tracking.
Currently, the only member of this structure is enable, which is a mask of the mixer events. The bits in the mask include:
QNX Neutrino
snd_mixer_get_filter(), snd_mixer_set_filter()