diff options
author | Michael Niedermayer <michaelni@gmx.at> | 2008-02-09 03:42:48 +0000 |
---|---|---|
committer | Michael Niedermayer <michaelni@gmx.at> | 2008-02-09 03:42:48 +0000 |
commit | fa4ed8c10af49ca22ead46ee6fa4e51c8327a7ff (patch) | |
tree | 6ecd8d0321c6c906f619afa5d7e5511d29b43240 /libavcodec/flacenc.c | |
parent | ead6ebdd4433b026e7a4ffd0ca20a4ba3c864ca7 (diff) | |
download | ffmpeg-streaming-fa4ed8c10af49ca22ead46ee6fa4e51c8327a7ff.zip ffmpeg-streaming-fa4ed8c10af49ca22ead46ee6fa4e51c8327a7ff.tar.gz |
optimize apply_welch_window()
Originally committed as revision 11881 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/flacenc.c')
-rw-r--r-- | libavcodec/flacenc.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/libavcodec/flacenc.c b/libavcodec/flacenc.c index 59192a1..4f273b7 100644 --- a/libavcodec/flacenc.c +++ b/libavcodec/flacenc.c @@ -595,11 +595,14 @@ static void apply_welch_window(const int32_t *data, int len, double *w_data) n2 = (len >> 1); c = 2.0 / (len - 1.0); + + w_data+=n2; + data+=n2; for(i=0; i<n2; i++) { - w = c - i - 1.0; + w = c - n2 + i; w = 1.0 - (w * w); - w_data[i] = data[i] * w; - w_data[len-1-i] = data[len-1-i] * w; + w_data[-i-1] = data[-i-1] * w; + w_data[+i ] = data[+i ] * w; } } |