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| author | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2009-11-04 17:30:23 +0000 |
|---|---|---|
| committer | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2009-11-04 17:30:23 +0000 |
| commit | 223217746c5beaa6110ce9ade2a582fc10d3d630 (patch) | |
| tree | efe7304981746185c85f16c977cca8691f381e74 /libavcodec | |
| parent | 981b8fd777f8ea273c53a055cbbb45ad9fe872aa (diff) | |
| download | ffmpeg-223217746c5beaa6110ce9ade2a582fc10d3d630.tar.gz | |
Pad ff_cos_tabs and ff_sin_tabs so that index n points to the table for n bits.
While this "wastes" up to 2x32 bytes it makes the code slightly simpler and
less confusing.
Originally committed as revision 20449 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/dsputil.h | 2 | ||||
| -rw-r--r-- | libavcodec/fft.c | 3 | ||||
| -rw-r--r-- | libavcodec/rdft.c | 5 |
3 files changed, 6 insertions, 4 deletions
diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h index c097461c4a..d64ef939ac 100644 --- a/libavcodec/dsputil.h +++ b/libavcodec/dsputil.h @@ -767,7 +767,7 @@ extern COSTABLE(8192); extern COSTABLE(16384); extern COSTABLE(32768); extern COSTABLE(65536); -extern COSTABLE_CONST FFTSample* const ff_cos_tabs[13]; +extern COSTABLE_CONST FFTSample* const ff_cos_tabs[17]; extern SINTABLE(16); extern SINTABLE(32); diff --git a/libavcodec/fft.c b/libavcodec/fft.c index e01005f501..958913b62c 100644 --- a/libavcodec/fft.c +++ b/libavcodec/fft.c @@ -45,6 +45,7 @@ COSTABLE(32768); COSTABLE(65536); #endif COSTABLE_CONST FFTSample * const ff_cos_tabs[] = { + NULL, NULL, NULL, NULL, ff_cos_16, ff_cos_32, ff_cos_64, ff_cos_128, ff_cos_256, ff_cos_512, ff_cos_1024, ff_cos_2048, ff_cos_4096, ff_cos_8192, ff_cos_16384, ff_cos_32768, ff_cos_65536, }; @@ -99,7 +100,7 @@ av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse) for(j=4; j<=nbits; j++) { int m = 1<<j; double freq = 2*M_PI/m; - FFTSample *tab = ff_cos_tabs[j-4]; + 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++) diff --git a/libavcodec/rdft.c b/libavcodec/rdft.c index 01aef872c2..46dd6dac3a 100644 --- a/libavcodec/rdft.c +++ b/libavcodec/rdft.c @@ -43,6 +43,7 @@ SINTABLE(32768); SINTABLE(65536); #endif SINTABLE_CONST FFTSample * const ff_sin_tabs[] = { + NULL, NULL, NULL, NULL, ff_sin_16, ff_sin_32, ff_sin_64, ff_sin_128, ff_sin_256, ff_sin_512, ff_sin_1024, ff_sin_2048, ff_sin_4096, ff_sin_8192, ff_sin_16384, ff_sin_32768, ff_sin_65536, }; @@ -63,8 +64,8 @@ av_cold int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans) if (ff_fft_init(&s->fft, nbits-1, trans == IRDFT || trans == RIDFT) < 0) return -1; - s->tcos = ff_cos_tabs[nbits-4]; - s->tsin = ff_sin_tabs[nbits-4]+(trans == RDFT || trans == IRIDFT)*(n>>2); + s->tcos = ff_cos_tabs[nbits]; + s->tsin = ff_sin_tabs[nbits]+(trans == RDFT || trans == IRIDFT)*(n>>2); #if !CONFIG_HARDCODED_TABLES for (i = 0; i < (n>>2); i++) { s->tsin[i] = sin(i*theta); |