From 297a95557946555e5cc51279abafc0dc362af5f7 Mon Sep 17 00:00:00 2001
From: Johannes Schickel
Date: Wed, 6 Jan 2010 15:40:49 +0000
Subject: - Simplify Audio::calculateSampleOffset. - Made
 Audio::calculateSampleOffset accessable from outside audiostream.cpp. - Adapt
 KYRA's AUDStream to use Audio::calculateSampleOffset.

svn-id: r47082
---
 sound/audiostream.cpp | 10 ++--------
 sound/audiostream.h   |  9 +++++++++
 2 files changed, 11 insertions(+), 8 deletions(-)

(limited to 'sound')

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
 
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