FFmpeg
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Files | |
file | avfft.h |
FFT functions. | |
Data Structures | |
struct | FFTComplex |
Typedefs | |
typedef float | FFTSample |
Enumerations | |
enum | RDFTransformType { DFT_R2C, IDFT_C2R, IDFT_R2C, DFT_C2R } |
enum | DCTTransformType { DCT_II = 0, DCT_III, DCT_I, DST_I } |
Functions | |
FFTContext * | av_fft_init (int nbits, int inverse) |
Set up a complex FFT. | |
void | av_fft_permute (FFTContext *s, FFTComplex *z) |
Do the permutation needed BEFORE calling ff_fft_calc(). | |
void | av_fft_calc (FFTContext *s, FFTComplex *z) |
Do a complex FFT with the parameters defined in av_fft_init(). | |
void | av_fft_end (FFTContext *s) |
FFTContext * | av_mdct_init (int nbits, int inverse, double scale) |
void | av_imdct_calc (FFTContext *s, FFTSample *output, const FFTSample *input) |
void | av_imdct_half (FFTContext *s, FFTSample *output, const FFTSample *input) |
void | av_mdct_calc (FFTContext *s, FFTSample *output, const FFTSample *input) |
void | av_mdct_end (FFTContext *s) |
RDFTContext * | av_rdft_init (int nbits, enum RDFTransformType trans) |
Set up a real FFT. | |
void | av_rdft_calc (RDFTContext *s, FFTSample *data) |
void | av_rdft_end (RDFTContext *s) |
DCTContext * | av_dct_init (int nbits, enum DCTTransformType type) |
Set up DCT. | |
void | av_dct_calc (DCTContext *s, FFTSample *data) |
void | av_dct_end (DCTContext *s) |
enum RDFTransformType |
enum DCTTransformType |
FFTContext* av_fft_init | ( | int | nbits, |
int | inverse | ||
) |
void av_fft_permute | ( | FFTContext * | s, |
FFTComplex * | z | ||
) |
void av_fft_calc | ( | FFTContext * | s, |
FFTComplex * | z | ||
) |
Do a complex FFT with the parameters defined in av_fft_init().
The input data must be permuted before. No 1.0/sqrt(n) normalization is done.
void av_fft_end | ( | FFTContext * | s | ) |
FFTContext* av_mdct_init | ( | int | nbits, |
int | inverse, | ||
double | scale | ||
) |
void av_imdct_calc | ( | FFTContext * | s, |
FFTSample * | output, | ||
const FFTSample * | input | ||
) |
void av_imdct_half | ( | FFTContext * | s, |
FFTSample * | output, | ||
const FFTSample * | input | ||
) |
void av_mdct_calc | ( | FFTContext * | s, |
FFTSample * | output, | ||
const FFTSample * | input | ||
) |
void av_mdct_end | ( | FFTContext * | s | ) |
RDFTContext* av_rdft_init | ( | int | nbits, |
enum RDFTransformType | trans | ||
) |
Set up a real FFT.
nbits | log2 of the length of the input array |
trans | the type of transform |
Referenced by config_output(), video_audio_display(), and yae_reset().
void av_rdft_calc | ( | RDFTContext * | s, |
FFTSample * | data | ||
) |
Referenced by plot_spectrum_column(), video_audio_display(), yae_apply(), yae_flush(), and yae_xcorr_via_rdft().
void av_rdft_end | ( | RDFTContext * | s | ) |
Referenced by config_output(), stream_component_close(), uninit(), video_audio_display(), yae_release_buffers(), and yae_reset().
DCTContext* av_dct_init | ( | int | nbits, |
enum DCTTransformType | type | ||
) |
Set up DCT.
nbits | size of the input array: (1 << nbits) for DCT-II, DCT-III and DST-I (1 << nbits) + 1 for DCT-I |
Referenced by init().
void av_dct_calc | ( | DCTContext * | s, |
FFTSample * | data | ||
) |
Referenced by dct_block(), and idct_block().
void av_dct_end | ( | DCTContext * | s | ) |
Referenced by uninit().