Get rid of some warnings

Mostly warnings about unused stuff.
Furthermore, the first hunk is a fix for the change in 177948a6.
Finally, comment in AEC_dtd was translated and the code simplified slightly.

CC     module_bluetooth_device_la-module-bluetooth-device.lo
modules/bluetooth/module-bluetooth-device.c: In function ‘a2dp_process_render’:
modules/bluetooth/module-bluetooth-device.c:1335:30: warning: pointer targets in passing argument 6 of ‘sbc_encode’
differ in signedness [-Wpointer-sign]
../src/modules/bluetooth/sbc/sbc.h:92:9: note: expected ‘ssize_t *’ but argument is of type ‘size_t *’

CC     module_rygel_media_server_la-module-rygel-media-server.lo
modules/module-rygel-media-server.c:383:13: warning: ‘append_property_dict_entry_object_array’ defined but not used [-Wunused-function]

CC     module_echo_cancel_la-adrian-aec.lo
modules/echo-cancel/adrian-aec.h:360:15: warning: ‘AEC_getambient’ defined but not used [-Wunused-function]
modules/echo-cancel/adrian-aec.h:368:14: warning: ‘AEC_setgain’ defined but not used [-Wunused-function]
modules/echo-cancel/adrian-aec.h:374:14: warning: ‘AEC_setaes’ defined but not used [-Wunused-function]
modules/echo-cancel/adrian-aec.h:377:16: warning: ‘AEC_max_dotp_xf_xf’ declared ‘static’ but never defined [-Wunused-function]

CC     module_echo_cancel_la-module-echo-cancel.lo
modules/echo-cancel/module-echo-cancel.c: In function ‘time_callback’:
modules/echo-cancel/module-echo-cancel.c:266:12: warning: variable ‘fs’ set but not used [-Wunused-but-set-variable]

CC     module-virtual-sink.lo
modules/module-virtual-sink.c: In function ‘sink_input_pop_cb’:
modules/module-virtual-sink.c:206:15: warning: variable ‘current_latency’ set but not used [-Wunused-but-set-variable]

1 files changed, 6 insertions, 10 deletions

diff --git a/src/modules/echo-cancel/adrian-aec.c b/src/modules/echo-cancel/adrian-aec.c
index 6793e59d..04b31e91 100644
--- a/src/modules/echo-cancel/adrian-aec.c
+++ b/src/modules/echo-cancel/adrian-aec.c
@@ -107,8 +107,7 @@ AEC* AEC_init(int RATE, int have_vector)
 // mapped to 1.0 with a limited linear function.
 static float AEC_dtd(AEC *a, REAL d, REAL x)
 {
-  float stepsize;
-  float ratio, M;
+  float ratio, stepsize;
 
   // fast near-end and far-end average
   a->dfast += ALPHAFAST * (fabsf(d) - a->dfast);
@@ -129,16 +128,13 @@ static float AEC_dtd(AEC *a, REAL d, REAL x)
   // ratio of NFRs
   ratio = (a->dfast * a->xslow) / (a->dslow * a->xfast);
 
-  // begrenzte lineare Kennlinie
-  M = (STEPY2 - STEPY1) / (STEPX2 - STEPX1);
-  if (ratio < STEPX1) {
+  // Linear interpolation with clamping at the limits
+  if (ratio < STEPX1)
     stepsize = STEPY1;
-  } else if (ratio > STEPX2) {
+  else if (ratio > STEPX2)
     stepsize = STEPY2;
-  } else {
-    // Punktrichtungsform einer Geraden
-    stepsize = M * (ratio - STEPX1) + STEPY1;
-  }
+  else
+    stepsize = STEPY1 + (STEPY2 - STEPY1) * (ratio - STEPX1) / (STEPX2 - STEPX1);
 
   return stepsize;
 }