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author | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2009-11-05 18:29:06 +0000 |
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committer | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2009-11-05 18:29:06 +0000 |
commit | 1ffc6e83276b24ffaea586c83b7aabb904e4be4b (patch) | |
tree | 89042ae2619a30b0c281553f75e5e2eca94149d3 /libavcodec/fft.c | |
parent | 9cad7e219377de4b466e8858286de23df3615b86 (diff) | |
download | ffmpeg-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.c | 24 |
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)); |