-void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params);
-void _snd_pcm_hw_param_setempty(snd_pcm_hw_params_t *params, snd_pcm_hw_param_t var);
-int snd_pcm_hw_param_min(snd_pcm_substream_t *substream,
- snd_pcm_hw_params_t *params,
- snd_pcm_hw_param_t var,
- unsigned int val, int *dir);
-int snd_pcm_hw_param_max(snd_pcm_substream_t *substream,
- snd_pcm_hw_params_t *params,
- snd_pcm_hw_param_t var,
- unsigned int val, int *dir);
-int snd_pcm_hw_param_setinteger(snd_pcm_substream_t *substream,
- snd_pcm_hw_params_t *params,
- snd_pcm_hw_param_t var);
-int snd_pcm_hw_param_first(snd_pcm_substream_t *substream,
- snd_pcm_hw_params_t *params,
- snd_pcm_hw_param_t var, int *dir);
-int snd_pcm_hw_param_last(snd_pcm_substream_t *substream,
- snd_pcm_hw_params_t *params,
- snd_pcm_hw_param_t var, int *dir);
-int snd_pcm_hw_param_near(snd_pcm_substream_t *substream,
- snd_pcm_hw_params_t *params,
- snd_pcm_hw_param_t var,
- unsigned int val, int *dir);
-int snd_pcm_hw_param_set(snd_pcm_substream_t *pcm,
- snd_pcm_hw_params_t *params,
- snd_pcm_hw_param_t var,
- unsigned int val, int dir);
-int snd_pcm_hw_params_choose(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *params);
-
-int snd_pcm_hw_refine(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *params);
-int snd_pcm_hw_params(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *params);
-
-int snd_pcm_hw_constraints_init(snd_pcm_substream_t *substream);
-int snd_pcm_hw_constraints_complete(snd_pcm_substream_t *substream);
-
-int snd_pcm_hw_constraint_mask(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
+void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
+void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
+int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
+
+int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
+
+int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
+int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
+
+int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,