hvirtual/quicktime/ffmpeg/libavcodec/mdct.c File Reference

#include "dsputil.h"

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Defines
#define	CMUL(pre, pim, are, aim, bre, bim)
Functions
int	ff_mdct_init (MDCTContext *s, int nbits, int inverse)
void	ff_imdct_calc (MDCTContext *s, FFTSample *output, const FFTSample *input, FFTSample *tmp)
void	ff_mdct_calc (MDCTContext *s, FFTSample *out, const FFTSample *input, FFTSample *tmp)
void	ff_mdct_end (MDCTContext *s)

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Detailed Description

MDCT/IMDCT transforms.

Definition in file mdct.c.

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Define Documentation

#define CMUL	(	pre,
		pim,
		are,
		aim,
		bre,
		bim		)

Value:

{\
    float _are = (are);\
    float _aim = (aim);\
    float _bre = (bre);\
    float _bim = (bim);\
    (pre) = _are * _bre - _aim * _bim;\
    (pim) = _are * _bim + _aim * _bre;\
}

Definition at line 61 of file mdct.c.

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Function Documentation

void ff_imdct_calc	(	MDCTContext *	s,
		FFTSample *	output,
		const FFTSample *	input,
		FFTSample *	tmp
	)

Compute inverse MDCT of size N = 2^nbits

Parameters:

	output	N samples
	input	N/2 samples
	tmp	N/2 samples

Definition at line 77 of file mdct.c.

References CMUL, ff_fft_calc(), MDCTContext::fft, FFTComplex::im, MDCTContext::nbits, FFTComplex::re, FFTContext::revtab, MDCTContext::tcos, and MDCTContext::tsin.

Referenced by main(), vorbis_parse_audio_packet(), and wma_decode_block().

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void ff_mdct_calc	(	MDCTContext *	s,
		FFTSample *	out,
		const FFTSample *	input,
		FFTSample *	tmp
	)

Compute MDCT of size N = 2^nbits

Parameters:

	input	N samples
	out	N/2 samples
	tmp	temporary storage of N/2 samples

Definition at line 129 of file mdct.c.

References CMUL, ff_fft_calc(), MDCTContext::fft, FFTComplex::im, MDCTContext::nbits, FFTComplex::re, FFTContext::revtab, MDCTContext::tcos, and MDCTContext::tsin.

Referenced by main().

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void ff_mdct_end

(

MDCTContext *

s

)

Definition at line 170 of file mdct.c.

References av_freep(), ff_fft_end(), MDCTContext::fft, MDCTContext::tcos, and MDCTContext::tsin.

Referenced by main(), vorbis_free(), and wma_decode_end().

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int ff_mdct_init	(	MDCTContext *	s,
		int	nbits,
		int	inverse
	)

init MDCT or IMDCT computation.

Definition at line 29 of file mdct.c.

References av_freep(), av_malloc(), ff_fft_init(), MDCTContext::fft, M_PI, MDCTContext::n, MDCTContext::nbits, MDCTContext::tcos, and MDCTContext::tsin.

Referenced by main(), vorbis_parse_id_hdr(), and wma_decode_init().

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