From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001 From: Sean Bartell Date: Sat, 25 Jun 2011 21:32:25 -0400 Subject: Add codecs to librbcodec. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius Tested-by: Nils Wallménius --- lib/rbcodec/codecs/libwmavoice/fft.h | 244 +++++++++++++++++++++++++++++++++++ 1 file changed, 244 insertions(+) create mode 100644 lib/rbcodec/codecs/libwmavoice/fft.h (limited to 'lib/rbcodec/codecs/libwmavoice/fft.h') diff --git a/lib/rbcodec/codecs/libwmavoice/fft.h b/lib/rbcodec/codecs/libwmavoice/fft.h new file mode 100644 index 0000000000..2c54b56658 --- /dev/null +++ b/lib/rbcodec/codecs/libwmavoice/fft.h @@ -0,0 +1,244 @@ +/* + * Copyright (c) 2000, 2001, 2002 Fabrice Bellard + * Copyright (c) 2002-2004 Michael Niedermayer + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVCODEC_FFT_H +#define AVCODEC_FFT_H + +#include +//#include "config.h" +#include "libavutil/mem.h" +#include "avfft.h" + +/* FFT computation */ + +struct FFTContext { + int nbits; + int inverse; + uint16_t *revtab; + FFTComplex *tmp_buf; + int mdct_size; /* size of MDCT (i.e. number of input data * 2) */ + int mdct_bits; /* n = 2^nbits */ + /* pre/post rotation tables */ + FFTSample *tcos; + FFTSample *tsin; + void (*fft_permute)(struct FFTContext *s, FFTComplex *z); + void (*fft_calc)(struct FFTContext *s, FFTComplex *z); + void (*imdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input); + void (*imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input); + void (*mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input); + int permutation; +#define FF_MDCT_PERM_NONE 0 +#define FF_MDCT_PERM_INTERLEAVE 1 +}; + +#if CONFIG_HARDCODED_TABLES +#define COSTABLE_CONST const +#define SINTABLE_CONST const +#define SINETABLE_CONST const +#else +#define COSTABLE_CONST +#define SINTABLE_CONST +#define SINETABLE_CONST +#endif + +#define COSTABLE(size) \ + COSTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_cos_##size)[size/2] +#define SINTABLE(size) \ + SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2] +#define SINETABLE(size) \ + SINETABLE_CONST DECLARE_ALIGNED(16, float, ff_sine_##size)[size] +extern COSTABLE(16); +extern COSTABLE(32); +extern COSTABLE(64); +extern COSTABLE(128); +extern COSTABLE(256); +extern COSTABLE(512); +extern COSTABLE(1024); +extern COSTABLE(2048); +extern COSTABLE(4096); +extern COSTABLE(8192); +extern COSTABLE(16384); +extern COSTABLE(32768); +extern COSTABLE(65536); +extern COSTABLE_CONST FFTSample* const ff_cos_tabs[17]; + +/** + * Initialize the cosine table in ff_cos_tabs[index] + * \param index index in ff_cos_tabs array of the table to initialize + */ +void ff_init_ff_cos_tabs(int index); + +extern SINTABLE(16); +extern SINTABLE(32); +extern SINTABLE(64); +extern SINTABLE(128); +extern SINTABLE(256); +extern SINTABLE(512); +extern SINTABLE(1024); +extern SINTABLE(2048); +extern SINTABLE(4096); +extern SINTABLE(8192); +extern SINTABLE(16384); +extern SINTABLE(32768); +extern SINTABLE(65536); + +/** + * Set up a complex FFT. + * @param nbits log2 of the length of the input array + * @param inverse if 0 perform the forward transform, if 1 perform the inverse + */ +int ff_fft_init(FFTContext *s, int nbits, int inverse); +void ff_fft_permute_c(FFTContext *s, FFTComplex *z); +void ff_fft_calc_c(FFTContext *s, FFTComplex *z); + +void ff_fft_init_altivec(FFTContext *s); +void ff_fft_init_mmx(FFTContext *s); +void ff_fft_init_arm(FFTContext *s); +void ff_dct_init_mmx(DCTContext *s); + +/** + * Do the permutation needed BEFORE calling ff_fft_calc(). + */ +static inline void ff_fft_permute(FFTContext *s, FFTComplex *z) +{ + s->fft_permute(s, z); +} +/** + * Do a complex FFT with the parameters defined in ff_fft_init(). The + * input data must be permuted before. No 1.0/sqrt(n) normalization is done. + */ +static inline void ff_fft_calc(FFTContext *s, FFTComplex *z) +{ + s->fft_calc(s, z); +} +void ff_fft_end(FFTContext *s); + +/* MDCT computation */ + +static inline void ff_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input) +{ + s->imdct_calc(s, output, input); +} +static inline void ff_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input) +{ + s->imdct_half(s, output, input); +} + +static inline void ff_mdct_calc(FFTContext *s, FFTSample *output, + const FFTSample *input) +{ + s->mdct_calc(s, output, input); +} + +/** + * Maximum window size for ff_kbd_window_init. + */ +#define FF_KBD_WINDOW_MAX 1024 + +/** + * Generate a Kaiser-Bessel Derived Window. + * @param window pointer to half window + * @param alpha determines window shape + * @param n size of half window, max FF_KBD_WINDOW_MAX + */ +void ff_kbd_window_init(float *window, float alpha, int n); + +/** + * Generate a sine window. + * @param window pointer to half window + * @param n size of half window + */ +void ff_sine_window_init(float *window, int n); + +/** + * initialize the specified entry of ff_sine_windows + */ +void ff_init_ff_sine_windows(int index); +extern SINETABLE( 32); +extern SINETABLE( 64); +extern SINETABLE( 128); +extern SINETABLE( 256); +extern SINETABLE( 512); +extern SINETABLE(1024); +extern SINETABLE(2048); +extern SINETABLE(4096); +extern SINETABLE_CONST float * const ff_sine_windows[13]; + +int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale); +void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input); +void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input); +void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input); +void ff_mdct_end(FFTContext *s); + +/* Real Discrete Fourier Transform */ + +struct RDFTContext { + int nbits; + int inverse; + int sign_convention; + + /* pre/post rotation tables */ + const FFTSample *tcos; + SINTABLE_CONST FFTSample *tsin; + FFTContext fft; + void (*rdft_calc)(struct RDFTContext *s, FFTSample *z); +}; + +/** + * Set up a real FFT. + * @param nbits log2 of the length of the input array + * @param trans the type of transform + */ +int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans); +void ff_rdft_end(RDFTContext *s); + +void ff_rdft_init_arm(RDFTContext *s); + +static av_always_inline void ff_rdft_calc(RDFTContext *s, FFTSample *data) +{ + s->rdft_calc(s, data); +} + +/* Discrete Cosine Transform */ + +struct DCTContext { + int nbits; + int inverse; + RDFTContext rdft; + const float *costab; + FFTSample *csc2; + void (*dct_calc)(struct DCTContext *s, FFTSample *data); + void (*dct32)(FFTSample *out, const FFTSample *in); +}; + +/** + * Set up DCT. + * @param nbits size of the input array: + * (1 << nbits) for DCT-II, DCT-III and DST-I + * (1 << nbits) + 1 for DCT-I + * + * @note the first element of the input of DST-I is ignored + */ +int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type); +void ff_dct_calc(DCTContext *s, FFTSample *data); +void ff_dct_end (DCTContext *s); + +#endif /* AVCODEC_FFT_H */ -- cgit v1.2.3