- Simplify Audio::calculateSampleOffset.

- Made Audio::calculateSampleOffset accessable from outside audiostream.cpp.
- Adapt KYRA's AUDStream to use Audio::calculateSampleOffset.

svn-id: r47082

2 files changed, 11 insertions, 8 deletions

diff --git a/sound/audiostream.cpp b/sound/audiostream.cpp
index acd5398bfd..a3a00a4eba 100644
--- a/sound/audiostream.cpp
+++ b/sound/audiostream.cpp
@@ -109,14 +109,8 @@ inline int32 calculatePlayTime(int rate, int samples) {
 }
 
 uint32 calculateSampleOffset(const Timestamp &where, int rate) {
-	const uint32 msecs = where.msecs();
-
-	const Timestamp msecStamp(msecs, rate);
-	const uint32 seconds = msecs / 1000;
-	const uint32 millis = msecs % 1000;
-	const uint32 samples = msecStamp.frameDiff(where) + (millis * rate) / 1000;
-
-	return seconds * rate + samples;
+	const Timestamp whereRate = where.convertToFramerate(rate);
+	return whereRate.secs() * rate + whereRate.getNumberOfFrames();
 }
 
 /**
diff --git a/sound/audiostream.h b/sound/audiostream.h
index 8fc485bdb3..3889cffbb4 100644
--- a/sound/audiostream.h
+++ b/sound/audiostream.h
@@ -205,6 +205,15 @@ public:
  */
 AppendableAudioStream *makeAppendableAudioStream(int rate, byte flags);
 
+/**
+ * Calculates the sample, which the timestamp describes in a
+ * AudioStream with the given framerate.
+ *
+ * @param where point in time
+ * @param rate rate of the AudioStream
+ * @return sample index
+ */
+uint32 calculateSampleOffset(const Timestamp &where, int rate);
 
 } // End of namespace Audio