VIDEO/GOB: Fixing the frame rate for mult'd videos.

In the gob engine, some videos are opened, and then played, at
a later time, one frame at a time. In this case, we need to
emulate the original's video player's behaviour, not calculating
any "lag" for videos without sound.

svn-id: r51870

2 files changed, 9 insertions, 0 deletions

diff --git a/graphics/video/coktel_decoder.cpp b/graphics/video/coktel_decoder.cpp
index c8a934d5bb..73bcc6a8d0 100644
--- a/graphics/video/coktel_decoder.cpp
+++ b/graphics/video/coktel_decoder.cpp
@@ -439,6 +439,13 @@ Common::Rational CoktelDecoder::getFrameRate() const {
 	return _frameRate;
 }
 
+uint32 CoktelDecoder::getTimeToNextFrame() const {
+	if (hasSound())
+		return FixedRateVideoDecoder::getTimeToNextFrame();
+
+	return (Common::Rational(1000) / _frameRate).toInt();
+}
+
 inline void CoktelDecoder::unsignedToSigned(byte *buffer, int length) {
 	while (length-- > 0) *buffer++ ^= 0x80;
 }
diff --git a/graphics/video/coktel_decoder.h b/graphics/video/coktel_decoder.h
index 0464b8e31b..9921fbd28c 100644
--- a/graphics/video/coktel_decoder.h
+++ b/graphics/video/coktel_decoder.h
@@ -174,6 +174,8 @@ protected:
 public:
 	// FixedRateVideoDecoder interface
 	Common::Rational getFrameRate() const;
+
+	uint32 getTimeToNextFrame() const;
 };
 
 class PreIMDDecoder : public CoktelDecoder {