void (*dump)(snd_pcm_t *pcm, snd_output_t *out);
int (*mmap)(snd_pcm_t *pcm);
int (*munmap)(snd_pcm_t *pcm);
+ int **(*query_chmaps)(snd_pcm_t *pcm);
+ int *(*get_chmap)(snd_pcm_t *pcm);
+ int (*set_chmap)(snd_pcm_t *pcm, const int *map);
} snd_pcm_ops_t;
typedef struct {