alsa: Try to support non-standard rates in alsa-sink/source

We inadvertantly stopped supporting non-standard rates when the
passthrough work was done. This makes sure that if no standard rates are
supported, we try to fallback to whatever ALSA gives us.

4 files changed, 22 insertions, 12 deletions

diff --git a/src/modules/alsa/alsa-sink.c b/src/modules/alsa/alsa-sink.c
index ee82ec72..ed41b222 100644
--- a/src/modules/alsa/alsa-sink.c
+++ b/src/modules/alsa/alsa-sink.c
@@ -2202,7 +2202,7 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     if (is_iec958(u) || is_hdmi(u))
         set_formats = TRUE;
 
-    u->rates = pa_alsa_get_supported_rates(u->pcm_handle);
+    u->rates = pa_alsa_get_supported_rates(u->pcm_handle, ss.rate);
     if (!u->rates) {
         pa_log_error("Failed to find any supported sample rates.");
         goto fail;
diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c
index 802b51b5..9f3170d1 100644
--- a/src/modules/alsa/alsa-source.c
+++ b/src/modules/alsa/alsa-source.c
@@ -1922,7 +1922,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
             pa_log_info("Disabling latency range changes on overrun");
     }
 
-    u->rates = pa_alsa_get_supported_rates(u->pcm_handle);
+    u->rates = pa_alsa_get_supported_rates(u->pcm_handle, ss.rate);
     if (!u->rates) {
         pa_log_error("Failed to find any supported sample rates.");
         goto fail;
diff --git a/src/modules/alsa/alsa-util.c b/src/modules/alsa/alsa-util.c
index 4a29a9a7..114ab271 100644
--- a/src/modules/alsa/alsa-util.c
+++ b/src/modules/alsa/alsa-util.c
@@ -1326,7 +1326,7 @@ char *pa_alsa_get_reserve_name(const char *device) {
     return pa_sprintf_malloc("Audio%i", i);
 }
 
-unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm) {
+unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm, unsigned int fallback_rate) {
     static unsigned int all_rates[] = { 8000, 11025, 12000,
                                         16000, 22050, 24000,
                                         32000, 44100, 48000,
@@ -1352,17 +1352,27 @@ unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm) {
         }
     }
 
-    if (n == 0)
-        return NULL;
+    if (n > 0) {
+        rates = pa_xnew(unsigned int, n + 1);
 
-    rates = pa_xnew(unsigned int, n + 1);
+        for (i = 0, j = 0; i < PA_ELEMENTSOF(all_rates); i++) {
+            if (supported[i])
+                rates[j++] = all_rates[i];
+        }
 
-    for (i = 0, j = 0; i < PA_ELEMENTSOF(all_rates); i++) {
-        if (supported[i])
-            rates[j++] = all_rates[i];
-    }
+        rates[j] = 0;
+    } else {
+        rates = pa_xnew(unsigned int, 2);
 
-    rates[j] = 0;
+        rates[0] = fallback_rate;
+        if ((ret = snd_pcm_hw_params_set_rate_near(pcm, hwparams, &rates[0], NULL)) < 0) {
+            pa_log_debug("snd_pcm_hw_params_set_rate_near() failed: %s", pa_alsa_strerror(ret));
+            pa_xfree(rates);
+            return NULL;
+        }
+
+        rates[1] = 0;
+    }
 
     return rates;
 }
diff --git a/src/modules/alsa/alsa-util.h b/src/modules/alsa/alsa-util.h
index 236a3294..1326e649 100644
--- a/src/modules/alsa/alsa-util.h
+++ b/src/modules/alsa/alsa-util.h
@@ -133,7 +133,7 @@ char *pa_alsa_get_driver_name_by_pcm(snd_pcm_t *pcm);
 
 char *pa_alsa_get_reserve_name(const char *device);
 
-unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm);
+unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm, unsigned int fallback_rate);
 
 pa_bool_t pa_alsa_pcm_is_hw(snd_pcm_t *pcm);
 pa_bool_t pa_alsa_pcm_is_modem(snd_pcm_t *pcm);