* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <stdlib.h>
#include <math.h>
-#include "dsputil.h"
+#include "libavutil/mathematics.h"
+#include "fft.h"
/**
- * @file libavcodec/rdft.c
+ * @file
* (Inverse) Real Discrete Fourier Transforms.
*/
ff_sin_2048, ff_sin_4096, ff_sin_8192, ff_sin_16384, ff_sin_32768, ff_sin_65536,
};
-av_cold int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans)
-{
- int n = 1 << nbits;
- int i;
- const double theta = (trans == RDFT || trans == IRIDFT ? -1 : 1)*2*M_PI/n;
-
- s->nbits = nbits;
- s->inverse = trans == IRDFT || trans == IRIDFT;
- s->sign_convention = trans == RIDFT || trans == IRIDFT ? 1 : -1;
-
- if (nbits < 4 || nbits > 16)
- return -1;
-
- if (ff_fft_init(&s->fft, nbits-1, trans == IRDFT || trans == RIDFT) < 0)
- return -1;
-
- ff_init_ff_cos_tabs(nbits);
- 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);
- }
-#endif
- return 0;
-}
-
/** Map one real FFT into two parallel real even and odd FFTs. Then interleave
* the two real FFTs into one complex FFT. Unmangle the results.
* ref: http://www.engineeringproductivitytools.com/stuff/T0001/PT10.HTM
*/
-void ff_rdft_calc_c(RDFTContext* s, FFTSample* data)
+static void ff_rdft_calc_c(RDFTContext* s, FFTSample* data)
{
int i, i1, i2;
FFTComplex ev, od;
}
}
-void ff_rdft_calc(RDFTContext *s, FFTSample *data)
+av_cold int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans)
{
- ff_rdft_calc_c(s, data);
+ int n = 1 << nbits;
+ int i;
+ const double theta = (trans == DFT_R2C || trans == DFT_C2R ? -1 : 1)*2*M_PI/n;
+
+ s->nbits = nbits;
+ s->inverse = trans == IDFT_C2R || trans == DFT_C2R;
+ s->sign_convention = trans == IDFT_R2C || trans == DFT_C2R ? 1 : -1;
+
+ if (nbits < 4 || nbits > 16)
+ return -1;
+
+ if (ff_fft_init(&s->fft, nbits-1, trans == IDFT_C2R || trans == IDFT_R2C) < 0)
+ return -1;
+
+ ff_init_ff_cos_tabs(nbits);
+ s->tcos = ff_cos_tabs[nbits];
+ s->tsin = ff_sin_tabs[nbits]+(trans == DFT_R2C || trans == DFT_C2R)*(n>>2);
+#if !CONFIG_HARDCODED_TABLES
+ for (i = 0; i < (n>>2); i++) {
+ s->tsin[i] = sin(i*theta);
+ }
+#endif
+ s->rdft_calc = ff_rdft_calc_c;
+
+ if (ARCH_ARM) ff_rdft_init_arm(s);
+
+ return 0;
}
av_cold void ff_rdft_end(RDFTContext *s)