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authorReimar Döffinger <Reimar.Doeffinger@gmx.de>2009-11-05 18:29:06 +0000
committerReimar Döffinger <Reimar.Doeffinger@gmx.de>2009-11-05 18:29:06 +0000
commit1ffc6e83276b24ffaea586c83b7aabb904e4be4b (patch)
tree89042ae2619a30b0c281553f75e5e2eca94149d3 /libavcodec/fft.c
parent9cad7e219377de4b466e8858286de23df3615b86 (diff)
downloadffmpeg-1ffc6e83276b24ffaea586c83b7aabb904e4be4b.tar.gz
Add ff_init_ff_cos_tabs function and use it in rdft.c to ensure that the
necessary ff_cos_tabs tables are initialized. Fixes issue 1507 (QDM2 broken since r20237 without hardcoded tables). Originally committed as revision 20464 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/fft.c')
-rw-r--r--libavcodec/fft.c24
1 files changed, 15 insertions, 9 deletions
diff --git a/libavcodec/fft.c b/libavcodec/fft.c
index 958913b62c..b46e72a6d8 100644
--- a/libavcodec/fft.c
+++ b/libavcodec/fft.c
@@ -61,6 +61,20 @@ static int split_radix_permutation(int i, int n, int inverse)
else return split_radix_permutation(i, m, inverse)*4 - 1;
}
+av_cold void ff_init_ff_cos_tabs(int index)
+{
+#if !CONFIG_HARDCODED_TABLES
+ int i;
+ int m = 1<<index;
+ double freq = 2*M_PI/m;
+ FFTSample *tab = ff_cos_tabs[index];
+ for(i=0; i<=m/4; i++)
+ tab[i] = cos(i*freq);
+ for(i=1; i<m/4; i++)
+ tab[m/2-i] = tab[i];
+#endif
+}
+
av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
{
int i, j, m, n;
@@ -96,17 +110,9 @@ av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
if (HAVE_MMX) ff_fft_init_mmx(s);
if (s->split_radix) {
-#if !CONFIG_HARDCODED_TABLES
for(j=4; j<=nbits; j++) {
- int m = 1<<j;
- double freq = 2*M_PI/m;
- FFTSample *tab = ff_cos_tabs[j];
- for(i=0; i<=m/4; i++)
- tab[i] = cos(i*freq);
- for(i=1; i<m/4; i++)
- tab[m/2-i] = tab[i];
+ ff_init_ff_cos_tabs(j);
}
-#endif
for(i=0; i<n; i++)
s->revtab[-split_radix_permutation(i, n, s->inverse) & (n-1)] = i;
s->tmp_buf = av_malloc(n * sizeof(FFTComplex));