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(Inverse) Real Discrete Fourier Transforms. More...
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 [] |
(Inverse) Real Discrete Fourier Transforms.
Definition in file rdft.c.
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 | ) |
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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 int ff_rdft_init | ( | RDFTContext * | s, |
int | nbits, | ||
enum RDFTransformType | trans | ||
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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().
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().
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