- fixed the rate selection in the plug layer:

the multiples of the given rate is chosen if available.
  the nearest rate is selected as usual if not available.

src/pcm/pcm_local.h

@@ -488,6 +488,10 @@ void snd_pcm_hw_param_refine_near(snd_pcm_t *pcm,
 				  snd_pcm_hw_params_t *params,
 				  snd_pcm_hw_param_t var,
 				  const snd_pcm_hw_params_t *src);
+void snd_pcm_hw_param_refine_multiple(snd_pcm_t *pcm,
+				      snd_pcm_hw_params_t *params,
+				      snd_pcm_hw_param_t var,
+				      const snd_pcm_hw_params_t *src);
 int snd_pcm_hw_param_empty(const snd_pcm_hw_params_t *params,
 			   snd_pcm_hw_param_t var);
 int snd_pcm_hw_param_always_eq(const snd_pcm_hw_params_t *params,

src/pcm/pcm_params.c

@@ -931,6 +931,27 @@ void snd_pcm_hw_param_refine_near(snd_pcm_t *pcm,
 					 min, &mindir, max, &maxdir);
 }
 
+void snd_pcm_hw_param_refine_multiple(snd_pcm_t *pcm,
+				      snd_pcm_hw_params_t *params,
+				      snd_pcm_hw_param_t var,
+				      const snd_pcm_hw_params_t *src)
+{
+	const snd_interval_t *it = hw_param_interval_c(src, var);
+	const snd_interval_t *st = hw_param_interval_c(params, var);
+	if (snd_interval_single(it)) {
+		unsigned int best = snd_interval_min(it), cur;
+		for (cur = best; ; cur += best) {
+			if (st->max < cur || (st->max == cur && st->openmax))
+				break;
+			if (it->min > cur || (it->min == cur && st->openmin))
+				continue;
+			if (! snd_pcm_hw_param_set(pcm, params, SND_TRY, var, cur, 0))
+				return; /* ok */
+		}
+	}
+	snd_pcm_hw_param_refine_near(pcm, params, var, src);
+}
+
 /* ---- end of refinement functions ---- */
 
 int snd_pcm_hw_param_empty(const snd_pcm_hw_params_t *params,

src/pcm/pcm_plug.c

@@ -652,8 +652,8 @@ static int snd_pcm_plug_hw_refine_schange(snd_pcm_t *pcm, snd_pcm_hw_params_t *p
 	if (plug->srate == -2)
 		links |= SND_PCM_HW_PARBIT_RATE;
 	else {
-		snd_pcm_hw_param_refine_near(slave, sparams, SND_PCM_HW_PARAM_RATE,
+		snd_pcm_hw_param_refine_multiple(slave, sparams, SND_PCM_HW_PARAM_RATE,
-					     params);
+						 params);
 	}
 	
 	if (plug->schannels == -2)