From 6d19ee6e64c9c6bf5ba5efa58028a300ffd4ce69 Mon Sep 17 00:00:00 2001
From: Sven Hesse
Date: Fri, 19 Dec 2008 00:14:18 +0000
Subject: Adding convenience functions to get the time to wait for the next
 frame, while keeping A/V sync

svn-id: r35431
---
 graphics/smk_player.cpp | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'graphics/smk_player.cpp')

diff --git a/graphics/smk_player.cpp b/graphics/smk_player.cpp
index 8252dd9c9b..41e118fc9e 100644
--- a/graphics/smk_player.cpp
+++ b/graphics/smk_player.cpp
@@ -351,6 +351,38 @@ int32 SMKPlayer::getFrameRate() {
 	return _header.frameRate;
 }
 
+int32 SMKPlayer::getFrameDelay() {
+	if (!_fileStream)
+		return 0;
+
+	if (_header.frameRate > 0)
+		return _header.frameRate * 100;
+	if (_header.frameRate < 0)
+		return -_header.frameRate;
+
+	return 10000;
+}
+
+int32 SMKPlayer::getAudioLag() {
+	if (!_fileStream || !_audioStream)
+		return 0;
+
+	int32 frameDelay = getFrameDelay();
+	int32 videoTime = _currentSMKFrame * frameDelay;
+	int32 audioTime = (((int32) _mixer->getSoundElapsedTime(_audioHandle)) * 100);
+
+	return videoTime - audioTime;
+}
+
+uint32 SMKPlayer::getFrameWaitTime() {
+	int32 waitTime = (getFrameDelay() + getAudioLag()) / 100;
+
+	if (waitTime < 0)
+		return 0;
+
+	return waitTime;
+}
+
 bool SMKPlayer::loadFile(const char *fileName) {
 	closeFile();
 
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