Changeset 39875 in vbox

Timestamp:

Jan 25, 2012 3:32:55 PM (13 years ago)

Author:

vboxsync

Message:

Devices/Audio: fixed rounding error in noaudio driver output.

File:

• trunk/src/VBox/Devices/Audio/noaudio.c (modified) (2 diffs)

trunk/src/VBox/Devices/Audio/noaudio.c

@@ -46 +46 @@
     int64_t now;
     int64_t ticks;
-    int64_t bytes;
+    int64_t ticks_per_second;
 
     live = audio_pcm_hw_get_live_out (&no->hw);
@@ -55 +55 @@
     now = audio_get_clock ();
     ticks = now - no->old_ticks;
-    bytes = (ticks * hw->info.bytes_per_second) / audio_get_ticks_per_sec ();
-    bytes = audio_MIN (bytes, INT_MAX);
-    samples = bytes >> hw->info.shift;
+
+    ticks_per_second = audio_get_ticks_per_sec ();
+    /* Minimize the rounding error: samples = int((ticks * freq) / ticks_per_second + 0.5). */
+    samples = (2 * ticks * hw->info.freq + ticks_per_second) / ticks_per_second / 2;
 
     no->old_ticks = now;