Quick rounding fixes

Author: lcferrum

CHANGELOG.TXT

@@ -1,3 +1,3 @@
-2014-08-25  Lcferrum <lcferrum@yandex.com>
+2014-08-26  Lcferrum <lcferrum@yandex.com>
 
 	* Release 1.0

README.TXT

@@ -97,8 +97,7 @@ log_file [optional, default: empty string]
     it will be created. Relative path is relative to AVS script location.
 
 log_append [optional, default: true]
-    If true - log file will be appended. If false - log file file will be
-    truncated.
+    If true - log file will be appended. If false - log file will be truncated.
 
 interval [optional, default: 1]
     Recognition interval in seconds. It means that every N seconds a frame will

src/ocrf.cpp

@@ -29,7 +29,7 @@ const AVS_Linkage *AVS_linkage=NULL;
 //Filters are created in order of appearance in AVS file
 OCRFilter::OCRFilter(PClip child, const char* log_file, bool log_append, int interval, const char* time_format, bool debug, bool localized_output, bool inverted, const char* threshold, IScriptEnvironment *env):
 	GenericVideoFilter(child),
-	fduration((unsigned int)((double)vi.fps_denominator/vi.fps_numerator*1000)), timer(interval*1000), last_frame(-1), time_format(SEC), debug(debug), log_file(), csv_sep(), dec_sep(), neg_sign(), ssocr()
+	fduration(((double)vi.fps_denominator/vi.fps_numerator*1000)), timer(interval*1000), last_frame(-1), time_format(SEC), debug(debug), log_file(), csv_sep(), dec_sep(), neg_sign(), ssocr()
 {
 	if (interval<0)
 		env->ThrowError("SegmentDisplayOCR: interval can't be negative number!");
@@ -95,13 +95,22 @@ OCRFilter::~OCRFilter()
 		log_file.close();
 }
 
+//Rounding algorithm from Java 7
+int OCRFilter::Round(double num)
+{
+	if (num!=0.49999999999999994)
+		return (int)floor(num+0.5);
+	else
+		return 0;
+}
+
 //GetFrame is called only when client or parent filter requests frame
 PVideoFrame __stdcall OCRFilter::GetFrame(int n, IScriptEnvironment *env)
 {
 	PVideoFrame src=child->GetFrame(n, env);
 
 	//For the sake of optimization, following variables are computed only ones per iteration
-	unsigned int cur_mseconds=fduration*n;
+	unsigned int cur_mseconds=Round(fduration*n);
 	bool newer=IsNewer(n);
 	bool alarm=CheckTimer(cur_mseconds);
 	std::string timestamp=(debug||(time_format==TMS&&alarm))?GetTimestamp(cur_mseconds):"";
@@ -165,7 +174,7 @@ bool OCRFilter::CheckTimer(unsigned int cur_mseconds)
 		return true;
 
 	unsigned int last_alarm=cur_mseconds-cur_mseconds%timer;
-	if (cur_mseconds>=last_alarm&&cur_mseconds<(last_alarm+fduration))
+	if (cur_mseconds>=last_alarm&&cur_mseconds<(last_alarm+Round(fduration)))
 		return true;
 	else
 		return false;

src/ocrf.h

@@ -21,7 +21,7 @@
 class OCRFilter: public GenericVideoFilter {
 private: 
 	enum TFEnum {TMS, RTM, SEC, MSEC, FRAME};
-	unsigned int fduration;		//Frame duration in mseconds
+	double fduration;			//Frame duration in mseconds
 	unsigned int timer;			//Timer in mseconds
 	int last_frame;				//Last processed frame
 	TFEnum time_format;
@@ -34,6 +34,7 @@ class OCRFilter: public GenericVideoFilter {
 	char time_fmt[80];
 	Ssocr *ssocr;
 
+	int Round(double num);
 	std::string GetTimestamp(unsigned int cur_mseconds);
 	bool CheckTimer(unsigned int cur_mseconds);
 	bool IsNewer(int cur_frame);