mirror of https://github.com/FFmpeg/FFmpeg.git
Merged-by: Michael Niedermayer <michaelni@gmx.at>oldabi
Michael Niedermayer
14 years ago
commit
d4a50a2100
44 changed files with 458 additions and 275 deletions
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/*
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* (I)DCT Transforms |
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* Copyright (c) 2009 Peter Ross <pross@xvid.org> |
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* Copyright (c) 2010 Alex Converse <alex.converse@gmail.com> |
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* Copyright (c) 2010 Vitor Sessak |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_DCT_H |
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#define AVCODEC_DCT_H |
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#include "rdft.h" |
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struct DCTContext { |
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int nbits; |
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int inverse; |
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RDFTContext rdft; |
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const float *costab; |
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FFTSample *csc2; |
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void (*dct_calc)(struct DCTContext *s, FFTSample *data); |
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void (*dct32)(FFTSample *out, const FFTSample *in); |
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}; |
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/**
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* Set up DCT. |
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* @param nbits size of the input array: |
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* (1 << nbits) for DCT-II, DCT-III and DST-I |
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* (1 << nbits) + 1 for DCT-I |
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* |
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* @note the first element of the input of DST-I is ignored |
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*/ |
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int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type); |
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void ff_dct_end (DCTContext *s); |
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#endif |
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/*
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <assert.h> |
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#include <libavutil/mathematics.h> |
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#include "libavutil/attributes.h" |
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#include "kbdwin.h" |
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#define BESSEL_I0_ITER 50 // default: 50 iterations of Bessel I0 approximation
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av_cold void ff_kbd_window_init(float *window, float alpha, int n) |
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{ |
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int i, j; |
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double sum = 0.0, bessel, tmp; |
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double local_window[FF_KBD_WINDOW_MAX]; |
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double alpha2 = (alpha * M_PI / n) * (alpha * M_PI / n); |
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assert(n <= FF_KBD_WINDOW_MAX); |
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for (i = 0; i < n; i++) { |
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tmp = i * (n - i) * alpha2; |
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bessel = 1.0; |
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for (j = BESSEL_I0_ITER; j > 0; j--) |
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bessel = bessel * tmp / (j * j) + 1; |
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sum += bessel; |
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local_window[i] = sum; |
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} |
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sum++; |
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for (i = 0; i < n; i++) |
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window[i] = sqrt(local_window[i] / sum); |
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} |
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/*
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_KBDWIN_H |
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#define AVCODEC_KBDWIN_H |
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/**
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* Maximum window size for ff_kbd_window_init. |
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*/ |
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#define FF_KBD_WINDOW_MAX 1024 |
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/**
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* Generate a Kaiser-Bessel Derived Window. |
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* @param window pointer to half window |
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* @param alpha determines window shape |
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* @param n size of half window, max FF_KBD_WINDOW_MAX |
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*/ |
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void ff_kbd_window_init(float *window, float alpha, int n); |
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#endif |
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/*
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* (I)RDFT transforms |
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* Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_RDFT_H |
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#define AVCODEC_RDFT_H |
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#include "config.h" |
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#include "fft.h" |
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#if CONFIG_HARDCODED_TABLES |
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# define SINTABLE_CONST const |
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#else |
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# define SINTABLE_CONST |
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#endif |
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#define SINTABLE(size) \ |
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SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2] |
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extern SINTABLE(16); |
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extern SINTABLE(32); |
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extern SINTABLE(64); |
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extern SINTABLE(128); |
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extern SINTABLE(256); |
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extern SINTABLE(512); |
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extern SINTABLE(1024); |
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extern SINTABLE(2048); |
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extern SINTABLE(4096); |
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extern SINTABLE(8192); |
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extern SINTABLE(16384); |
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extern SINTABLE(32768); |
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extern SINTABLE(65536); |
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struct RDFTContext { |
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int nbits; |
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int inverse; |
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int sign_convention; |
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/* pre/post rotation tables */ |
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const FFTSample *tcos; |
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SINTABLE_CONST FFTSample *tsin; |
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FFTContext fft; |
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void (*rdft_calc)(struct RDFTContext *s, FFTSample *z); |
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}; |
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/**
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* Set up a real FFT. |
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* @param nbits log2 of the length of the input array |
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* @param trans the type of transform |
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*/ |
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int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans); |
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void ff_rdft_end(RDFTContext *s); |
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void ff_rdft_init_arm(RDFTContext *s); |
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#endif |
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@ -0,0 +1,20 @@ |
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/*
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "sinewin.h" |
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#include "sinewin_tablegen.h" |
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@ -0,0 +1,59 @@ |
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/*
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* Copyright (c) 2008 Robert Swain |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_SINEWIN_H |
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#define AVCODEC_SINEWIN_H |
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#include "config.h" |
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#include "libavutil/mem.h" |
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#if CONFIG_HARDCODED_TABLES |
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# define SINETABLE_CONST const |
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#else |
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# define SINETABLE_CONST |
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#endif |
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#define SINETABLE(size) \ |
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SINETABLE_CONST DECLARE_ALIGNED(16, float, ff_sine_##size)[size] |
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/**
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* Generate a sine window. |
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* @param window pointer to half window |
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* @param n size of half window |
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*/ |
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void ff_sine_window_init(float *window, int n); |
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/**
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* initialize the specified entry of ff_sine_windows |
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*/ |
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void ff_init_ff_sine_windows(int index); |
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extern SINETABLE( 32); |
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extern SINETABLE( 64); |
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extern SINETABLE( 128); |
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extern SINETABLE( 256); |
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extern SINETABLE( 512); |
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extern SINETABLE(1024); |
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extern SINETABLE(2048); |
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extern SINETABLE(4096); |
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extern SINETABLE_CONST float * const ff_sine_windows[13]; |
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#endif |
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