audio/pw: remove wrong comment

[mirror_qemu.git] / audio / rate_template.h

diff --git a/audio/rate_template.h b/audio/rate_template.h
index 6e93588877d01b90acd29265f3c01c38df3c673e..6648f0d2e55e5d8a46fb52fe303120128935efd9 100644 (file)
--- a/audio/rate_template.h
+++ b/audio/rate_template.h
@@ -28,7 +28,7 @@
  * Return number of samples processed.
  */
 void NAME (void *opaque, struct st_sample *ibuf, struct st_sample *obuf,
-           int *isamp, int *osamp)
+           size_t *isamp, size_t *osamp)
 {
     struct rate *rate = opaque;
     struct st_sample *istart, *iend;
@@ -40,8 +40,6 @@ void NAME (void *opaque, struct st_sample *ibuf, struct st_sample *obuf,
     int64_t t;
 #endif
 
-    ilast = rate->ilast;
-
     istart = ibuf;
     iend = ibuf + *isamp;
 
@@ -59,32 +57,40 @@ void NAME (void *opaque, struct st_sample *ibuf, struct st_sample *obuf,
         return;
     }
 
-    while (obuf < oend) {
+    /* without input samples, there's nothing to do */
+    if (ibuf >= iend) {
+        *osamp = 0;
+        return;
+    }
 
-        /* Safety catch to make sure we have input samples.  */
-        if (ibuf >= iend) {
-            break;
-        }
+    ilast = rate->ilast;
 
-        /* read as many input samples so that ipos > opos */
+    while (true) {
 
+        /* read as many input samples so that ipos > opos */
         while (rate->ipos <= (rate->opos >> 32)) {
             ilast = *ibuf++;
             rate->ipos++;
 
-            /* if ipos overflow, there is  a infinite loop */
-            if (rate->ipos == 0xffffffff) {
-                rate->ipos = 1;
-                rate->opos = rate->opos & 0xffffffff;
-            }
             /* See if we finished the input buffer yet */
             if (ibuf >= iend) {
                 goto the_end;
             }
         }
 
+        /* make sure that the next output sample can be written */
+        if (obuf >= oend) {
+            break;
+        }
+
         icur = *ibuf;
 
+        /* wrap ipos and opos around long before they overflow */
+        if (rate->ipos >= 0x10001) {
+            rate->ipos = 1;
+            rate->opos &= 0xffffffff;
+        }
+
         /* interpolate */
 #ifdef FLOAT_MIXENG
 #ifdef RECIPROCAL