manfred <[EMAIL PROTECTED]> added the comment:
Hello aurel,
I've testet the two patches from msg2835, both seems to do the work.
The other thing is the efficence of ff_sine_window_init. The old wma.c
version did the most calculation out of the loop, now all is done
inside (up to 2048 at a call). Especialy float devides are very slow.
Wouldn't it be faster to do it the "old" way:
diff -ur ffmpeg.orig/libavcodec/mdct.c ffmpeg/libavcodec/mdct.c
--- ffmpeg.orig/libavcodec/mdct.c 2008-08-15 00:38:06.000000000
+0200
+++ ffmpeg/libavcodec/mdct.c 2008-08-21 21:17:21.000000000 +0200
@@ -60,8 +60,10 @@
// Generate a sine window.
void ff_sine_window_init(float *window, int n) {
int i;
+ float alpha;
+ alpha = M_PI / (2.0 * n);
for(i = 0; i < n; i++)
- window[i] = sin((i + 0.5) / (2 * n) * M_PI);
+ window[i] = sin((i + 0.5) * alpha);
}
/**
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