[SCM] libav/experimental: Clean up fft_init() and mdct_init()
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 17:20:09 UTC 2013
The following commit has been merged in the experimental branch:
commit b84a211bc83a784d3c57b530f44fbfb7d45e4b3b
Author: Justin Ruggles <justin.ruggles at gmail.com>
Date: Tue Dec 14 14:51:12 2010 +0000
Clean up fft_init() and mdct_init()
Originally committed as revision 25959 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index ef2ffb3..e35286b 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -93,13 +93,14 @@ typedef struct IComplex {
static av_cold void fft_init(int ln)
{
- int i, n;
+ int i, n, n2;
float alpha;
- n = 1 << ln;
+ n = 1 << ln;
+ n2 = n >> 1;
- for (i = 0; i < n/2; i++) {
- alpha = 2 * M_PI * (float)i / (float)n;
+ for (i = 0; i < n2; i++) {
+ alpha = 2.0 * M_PI * i / n;
costab[i] = FIX15(cos(alpha));
sintab[i] = FIX15(sin(alpha));
}
@@ -107,15 +108,15 @@ static av_cold void fft_init(int ln)
static av_cold void mdct_init(int nbits)
{
- int i;
- float alpha;
- int n = 1 << nbits;
- int n4 = n >> 2;
+ int i, n, n4;
+
+ n = 1 << nbits;
+ n4 = n >> 2;
fft_init(nbits - 2);
for (i = 0; i < n4; i++) {
- alpha = 2 * M_PI * (i + 1.0 / 8.0) / n;
+ float alpha = 2.0 * M_PI * (i + 1.0 / 8.0) / n;
xcos1[i] = FIX15(-cos(alpha));
xsin1[i] = FIX15(-sin(alpha));
}
--
Libav/FFmpeg packaging
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