From: Kartik K. Khullar<kartikkhullar...@gmail.com>
---
FFmpeg/libavcodec/flif16transform.c | 53 +++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/FFmpeg/libavcodec/flif16transform.c
b/FFmpeg/libavcodec/flif16transform.c
index e69de29..febf5e9 100644
--- a/FFmpeg/libavcodec/flif16transform.c
+++ b/FFmpeg/libavcodec/flif16transform.c
@@ -0,0 +1,53 @@
+#include <math.h>
+#include <stdint.h>
+
+//array of 2 elements is used as parameter because it represents min, max pair.
+void TransformYCoCg(int16_t *range[2], int16_t *crange[2], int16_t yval,
int16_t coval){
+ int max_temp;
+ if (range[1][0] > range[1][1]){
+ if (range[1][0] > range[1][2]){
+ max_temp = range[1][0];
+ }
+ else{
+ max_temp = range[1][2];
+ }
+ }
+ else{
+ max_temp = range[1][1];
+ }
+ int origmax4 = max_temp / 4 + 1;
+ int newmax = 4*origmax4 - 1;
+
+ //Updating color ranges
+ range[0][0] = 0; //first channel minimum
+ range[1][0] = newmax; //first channek maximum
+ range[0][1] = -newmax; //second channel minimum
+ range[1][1] = newmax; //second channel maximum
+ range[0][2] = -newmax; //third channel minimum
+ range[1][2] = newmax; //third channel maximum
+
+ //Updating conditional range values
+ crange[0][0] = range[0][0];
+ crange[1][0] = range[1][0];
+
+ if (yval < origmax4 - 1){
+ crange[0][1] = -3 + 4*yval;
+ crange[1][1] = 3 + 4*yval;
+ crange[0][2] = -2 - 2*yval;
+ crange[1][2] = 1 + 2 * yval - 2 * (abs(coval)/2);
+ }
+ else if (yval > 3*origmax4 - 1){
+ crange[0][1] = 4*(yval - newmax);
+ crange[1][1] = 4*(newmax - yval);
+ crange[0][2] = -2*(newmax - yval) + 2 * ((abs(coval)+1)/2);
+ crange[1][2] = 2*(newmax - yval);
+ }
+ else{
+ crange[0][1] = -newmax;
+ crange[1][1] = newmax;
+ crange[0][2] = (((2*newmax - 2*yval - 2*abs(coval) + 1) < (2 *
yval + 1)) ?
+ (2*newmax - 2*yval - 2*abs(coval) + 1) : (2 * yval + 1)) / 2;
+ crange[1][2] = (2*(yval - newmax)) < (-2*yval - 1 +
2*(abs(coval)/2)) ?
+ (2*(yval - newmax)) : (-2*yval - 1 + 2*(abs(coval)/2));
+ }
+}
\ No newline at end of file
--
2.20.1.windows.1
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