VIDEO: Allow AVI frame rate to be overriden with a constant

Required for sword1/sword2 MPEG videos

2 files changed, 22 insertions, 5 deletions

diff --git a/video/avi_decoder.cpp b/video/avi_decoder.cpp
index 32238eca4e..ff728a8437 100644
--- a/video/avi_decoder.cpp
+++ b/video/avi_decoder.cpp
@@ -91,7 +91,20 @@ static uint16 getStreamType(uint32 tag) {
 	return tag & 0xffff;
 }
 
-AVIDecoder::AVIDecoder(Audio::Mixer::SoundType soundType) : _soundType(soundType) {
+AVIDecoder::AVIDecoder(Audio::Mixer::SoundType soundType) : _frameRateOverride(0), _soundType(soundType) {
+	initCommon();
+}
+
+AVIDecoder::AVIDecoder(const Common::Rational &frameRateOverride, Audio::Mixer::SoundType soundType)
+		: _frameRateOverride(frameRateOverride), _soundType(soundType) {
+	initCommon();
+}
+
+AVIDecoder::~AVIDecoder() {
+	close();
+}
+
+void AVIDecoder::initCommon() {
 	_decodedHeader = false;
 	_foundMovieList = false;
 	_fileStream = 0;
@@ -99,10 +112,6 @@ AVIDecoder::AVIDecoder(Audio::Mixer::SoundType soundType) : _soundType(soundType
 	memset(&_header, 0, sizeof(_header));
 }
 
-AVIDecoder::~AVIDecoder() {
-	close();
-}
-
 void AVIDecoder::runHandle(uint32 tag) {
 	assert(_fileStream);
 	if (_fileStream->eos())
@@ -214,6 +223,11 @@ void AVIDecoder::handleStreamHeader() {
 	uint32 startPos = _fileStream->pos();
 
 	if (sHeader.streamType == ID_VIDS) {
+		if (_frameRateOverride != 0) {
+			sHeader.rate = _frameRateOverride.getNumerator();
+			sHeader.scale = _frameRateOverride.getDenominator();
+		}
+
 		BitmapInfoHeader bmInfo;
 		bmInfo.size = _fileStream->readUint32LE();
 		bmInfo.width = _fileStream->readUint32LE();
diff --git a/video/avi_decoder.h b/video/avi_decoder.h
index bc870eac33..1652614bd8 100644
--- a/video/avi_decoder.h
+++ b/video/avi_decoder.h
@@ -56,6 +56,7 @@ class Codec;
 class AVIDecoder : public VideoDecoder {
 public:
 	AVIDecoder(Audio::Mixer::SoundType soundType = Audio::Mixer::kPlainSoundType);
+	AVIDecoder(const Common::Rational &frameRateOverride, Audio::Mixer::SoundType soundType = Audio::Mixer::kPlainSoundType);
 	virtual ~AVIDecoder();
 
 	bool loadStream(Common::SeekableReadStream *stream);
@@ -222,6 +223,8 @@ private:
 	bool _decodedHeader, _foundMovieList;
 
 	Audio::Mixer::SoundType _soundType;
+	Common::Rational _frameRateOverride;
+	void initCommon();
 
 	void runHandle(uint32 tag);
 	void handleList();