opus_imdct.c File Reference

Celt non-power of 2 iMDCT. More...

#include <float.h>
#include <math.h>
#include <stddef.h>
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "avfft.h"
#include "opus.h"
#include "opus_imdct.h"

Go to the source code of this file.

Macros
#define	CELT_MIN_IMDCT_SIZE   120
#define	CMUL3(cre, cim, are, aim, bre, bim)
#define	CMUL(c, a, b)   CMUL3((c).re, (c).im, (a).re, (a).im, (b).re, (b).im)
#define	CMUL2(c, d, a, b)

Functions
av_cold void	ff_celt_imdct_uninit (CeltIMDCTContext **ps)
	Free an iMDCT.
static void	celt_imdct_half (CeltIMDCTContext *s, float *dst, const float *src, ptrdiff_t stride, float scale)
av_cold int	ff_celt_imdct_init (CeltIMDCTContext **ps, int N)
	Init an iMDCT of the length 2 * 15 * (2^N)
static void	fft5 (FFTComplex *out, const FFTComplex *in, ptrdiff_t stride)
static void	fft15 (CeltIMDCTContext *s, FFTComplex *out, const FFTComplex *in, ptrdiff_t stride)
static void	fft_calc (CeltIMDCTContext *s, FFTComplex *out, const FFTComplex *in, int N, ptrdiff_t stride)

Detailed Description

Celt non-power of 2 iMDCT.

Definition in file opus_imdct.c.

Macro Definition Documentation

#define CELT_MIN_IMDCT_SIZE   120

Definition at line 40 of file opus_imdct.c.

Referenced by ff_celt_imdct_init().

#define CMUL3	(		cre,
			cim,
			are,
			aim,
			bre,
			bim
	)

Value:

do {                                                 \
    cre = are * bre - aim * bim;                     \
    cim = are * bim + aim * bre;                     \
} while (0)

Definition at line 43 of file opus_imdct.c.

Referenced by celt_imdct_half().

#define CMUL	(		c,
			a,
			b
	)		CMUL3((c).re, (c).im, (a).re, (a).im, (b).re, (b).im)

Definition at line 49 of file opus_imdct.c.

Referenced by celt_imdct_half(), fft15(), and fft_calc().

#define CMUL2	(		c,
			d,
			a,
			b
	)

Value:

do {                                                 \
    float are = (a).re;                              \
    float aim = (a).im;                              \
    float bre = (b).re;                              \
    float bim = (b).im;                              \
    float rr  = are * bre;                           \
    float ri  = are * bim;                           \
    float ir  = aim * bre;                           \
    float ii  = aim * bim;                           \
    (c).re =  rr - ii;                               \
    (c).im =  ri + ir;                               \
    (d).re =  rr + ii;                               \
    (d).im = -ri + ir;                               \
} while (0)

Definition at line 53 of file opus_imdct.c.

Referenced by fft5().

Function Documentation

av_cold void ff_celt_imdct_uninit

(

CeltIMDCTContext **

ps

)

Free an iMDCT.

Definition at line 69 of file opus_imdct.c.

Referenced by ff_celt_free(), and ff_celt_imdct_init().

static void celt_imdct_half ( CeltIMDCTContext *  s, float *  dst, const float *  src, ptrdiff_t  stride, float  scale  )

static

Definition at line 244 of file opus_imdct.c.

Referenced by ff_celt_imdct_init().

av_cold int ff_celt_imdct_init	(	CeltIMDCTContext **	ps,
		int	N
	)

Init an iMDCT of the length 2 * 15 * (2^N)

Definition at line 90 of file opus_imdct.c.

Referenced by ff_celt_init().

static void fft5 ( FFTComplex *  out, const FFTComplex *  in, ptrdiff_t  stride  )

static

Definition at line 150 of file opus_imdct.c.

Referenced by fft15().

static void fft15 ( CeltIMDCTContext *  s, FFTComplex *  out, const FFTComplex *  in, ptrdiff_t  stride  )

static

Definition at line 183 of file opus_imdct.c.

Referenced by fft_calc().

static void fft_calc ( CeltIMDCTContext *  s, FFTComplex *  out, const FFTComplex *  in, int  N, ptrdiff_t  stride  )

static

Definition at line 218 of file opus_imdct.c.

Referenced by celt_imdct_half().