[PATCH] Fix apodization functions

[Martijn van Beurden]

The bartlett, bartlett_hann and triangle functions were broken.
Especially bartlett and bartlett_hann produced bad results,
worse than using a rectangular window. They have been fixed and
should now be according to the textbook definition
---
 src/libFLAC/window.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/libFLAC/window.c b/src/libFLAC/window.c
index b873368..f6cd505 100644
--- a/src/libFLAC/window.c
+++ b/src/libFLAC/window.c
@@ -58,7 +58,7 @@ void FLAC__window_bartlett(FLAC__real *window, const FLAC__int32 L)
 		for (n = 0; n <= L/2-1; n++)
 			window[n] = 2.0f * n / (float)N;
 		for (; n <= N; n++)
-			window[n] = 2.0f - 2.0f * (N-n) / (float)N;
+			window[n] = 2.0f - 2.0f * n / (float)N;
 	}
 }
 
@@ -68,7 +68,7 @@ void FLAC__window_bartlett_hann(FLAC__real *window, const FLAC__int32 L)
 	FLAC__int32 n;
 
 	for (n = 0; n < L; n++)
-		window[n] = (FLAC__real)(0.62f - 0.48f * fabs((float)n/(float)N+0.5f) + 0.38f * cos(2.0f * M_PI * ((float)n/(float)N+0.5f)));
+		window[n] = (FLAC__real)(0.62f - 0.48f * fabs((float)n/(float)N-0.5f) - 0.38f * cos(2.0f * M_PI * ((float)n/(float)N)));
 }
 
 void FLAC__window_blackman(FLAC__real *window, const FLAC__int32 L)
@@ -173,16 +173,16 @@ void FLAC__window_triangle(FLAC__real *window, const FLAC__int32 L)
 	FLAC__int32 n;
 
 	if (L & 1) {
-		for (n = 1; n <= L+1/2; n++)
+		for (n = 1; n <= (L+1)/2; n++)
 			window[n-1] = 2.0f * n / ((float)L + 1.0f);
 		for (; n <= L; n++)
-			window[n-1] = - (float)(2 * (L - n + 1)) / ((float)L + 1.0f);
+			window[n-1] = (float)(2 * (L - n + 1)) / ((float)L + 1.0f);
 	}
 	else {
 		for (n = 1; n <= L/2; n++)
-			window[n-1] = 2.0f * n / (float)L;
+			window[n-1] = 2.0f * n / ((float)L + 1.0f);
 		for (; n <= L; n++)
-			window[n-1] = ((float)(2 * (L - n)) + 1.0f) / (float)L;
+			window[n-1] = (float)(2 * (L - n + 1)) / ((float)L + 1.0f);
 	}
 }
 
-- 
1.9.1


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