diff options
Diffstat (limited to 'ffmpeg1/libavcodec/atrac.c')
| -rw-r--r-- | ffmpeg1/libavcodec/atrac.c | 119 |
1 files changed, 0 insertions, 119 deletions
diff --git a/ffmpeg1/libavcodec/atrac.c b/ffmpeg1/libavcodec/atrac.c deleted file mode 100644 index ea342a0..0000000 --- a/ffmpeg1/libavcodec/atrac.c +++ /dev/null @@ -1,119 +0,0 @@ -/* - * Atrac common functions - * Copyright (c) 2006-2008 Maxim Poliakovski - * Copyright (c) 2006-2008 Benjamin Larsson - * - * 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 - */ - -/** - * @file - */ - -#include <math.h> -#include <stddef.h> -#include <stdio.h> -#include <string.h> - -#include "avcodec.h" -#include "atrac.h" - -float ff_atrac_sf_table[64]; -static float qmf_window[48]; - -static const float qmf_48tap_half[24] = { - -0.00001461907, -0.00009205479,-0.000056157569,0.00030117269, - 0.0002422519, -0.00085293897,-0.0005205574, 0.0020340169, - 0.00078333891, -0.0042153862, -0.00075614988, 0.0078402944, - -0.000061169922,-0.01344162, 0.0024626821, 0.021736089, - -0.007801671, -0.034090221, 0.01880949, 0.054326009, - -0.043596379, -0.099384367, 0.13207909, 0.46424159 -}; - -/** - * Generate common tables - */ - -void ff_atrac_generate_tables(void) -{ - int i; - float s; - - /* Generate scale factors */ - if (!ff_atrac_sf_table[63]) - for (i=0 ; i<64 ; i++) - ff_atrac_sf_table[i] = pow(2.0, (i - 15) / 3.0); - - /* Generate the QMF window. */ - if (!qmf_window[47]) - for (i=0 ; i<24; i++) { - s = qmf_48tap_half[i] * 2.0; - qmf_window[i] = qmf_window[47 - i] = s; - } -} - - -/** - * Quadrature mirror synthesis filter. - * - * @param inlo lower part of spectrum - * @param inhi higher part of spectrum - * @param nIn size of spectrum buffer - * @param pOut out buffer - * @param delayBuf delayBuf buffer - * @param temp temp buffer - */ - - -void ff_atrac_iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp) -{ - int i, j; - float *p1, *p3; - - memcpy(temp, delayBuf, 46*sizeof(float)); - - p3 = temp + 46; - - /* loop1 */ - for(i=0; i<nIn; i+=2){ - p3[2*i+0] = inlo[i ] + inhi[i ]; - p3[2*i+1] = inlo[i ] - inhi[i ]; - p3[2*i+2] = inlo[i+1] + inhi[i+1]; - p3[2*i+3] = inlo[i+1] - inhi[i+1]; - } - - /* loop2 */ - p1 = temp; - for (j = nIn; j != 0; j--) { - float s1 = 0.0; - float s2 = 0.0; - - for (i = 0; i < 48; i += 2) { - s1 += p1[i] * qmf_window[i]; - s2 += p1[i+1] * qmf_window[i+1]; - } - - pOut[0] = s2; - pOut[1] = s1; - - p1 += 2; - pOut += 2; - } - - /* Update the delay buffer. */ - memcpy(delayBuf, temp + nIn*2, 46*sizeof(float)); -} |
