#include <stdlib.h>
#include <math.h>
#include "libavutil/mathematics.h"
#include "rdft.h"
Go to the source code of this file.
Functions | |
| SINTABLE (16) | |
| SINTABLE (32) | |
| SINTABLE (64) | |
| SINTABLE (128) | |
| SINTABLE (256) | |
| SINTABLE (512) | |
| SINTABLE (1024) | |
| SINTABLE (2048) | |
| SINTABLE (4096) | |
| SINTABLE (8192) | |
| SINTABLE (16384) | |
| SINTABLE (32768) | |
| SINTABLE (65536) | |
| static void | ff_rdft_calc_c (RDFTContext *s, FFTSample *data) |
| Map one real FFT into two parallel real even and odd FFTs. | |
| av_cold int | ff_rdft_init (RDFTContext *s, int nbits, enum RDFTransformType trans) |
| Set up a real FFT. | |
| av_cold void | ff_rdft_end (RDFTContext *s) |
Variables | |
| static SINTABLE_CONST FFTSample *const | ff_sin_tabs [] |
Definition in file rdft.c.
| static void ff_rdft_calc_c | ( | RDFTContext * | s, | |
| FFTSample * | data | |||
| ) | [static] |
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
Definition at line 57 of file rdft.c.
Referenced by ff_rdft_init().
| av_cold void ff_rdft_end | ( | RDFTContext * | s | ) |
Definition at line 130 of file rdft.c.
Referenced by decode_end(), ff_dct_end(), main(), qdm2_decode_close(), and wmavoice_decode_end().
| av_cold int ff_rdft_init | ( | RDFTContext * | s, | |
| int | nbits, | |||
| enum RDFTransformType | trans | |||
| ) |
Set up a real FFT.
| nbits | log2 of the length of the input array | |
| trans | the type of transform |
Definition at line 99 of file rdft.c.
Referenced by decode_init(), ff_dct_init(), main(), qdm2_decode_init(), and wmavoice_decode_init().
| SINTABLE | ( | 65536 | ) |
| SINTABLE | ( | 32768 | ) |
| SINTABLE | ( | 16384 | ) |
| SINTABLE | ( | 8192 | ) |
| SINTABLE | ( | 4096 | ) |
| SINTABLE | ( | 2048 | ) |
| SINTABLE | ( | 1024 | ) |
| SINTABLE | ( | 512 | ) |
| SINTABLE | ( | 256 | ) |
| SINTABLE | ( | 128 | ) |
| SINTABLE | ( | 64 | ) |
| SINTABLE | ( | 32 | ) |
| SINTABLE | ( | 16 | ) |
SINTABLE_CONST FFTSample* const ff_sin_tabs[] [static] |
Initial value:
{
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,
}
Definition at line 47 of file rdft.c.
Referenced by ff_rdft_init().
1.5.8