| /* | |
| * ADX ADPCM codecs | |
| * Copyright (c) 2001,2003 BERO | |
| * | |
| * 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 | |
| * SEGA CRI adx codecs. | |
| * | |
| * Reference documents: | |
| * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html | |
| * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/ | |
| */ | |
| typedef struct ADXChannelState { | |
| int s1,s2; | |
| } ADXChannelState; | |
| typedef struct ADXContext { | |
| int channels; | |
| ADXChannelState prev[MAX_CHANNELS]; | |
| int header_parsed; | |
| int eof; | |
| int cutoff; | |
| int coeff[2]; | |
| } ADXContext; | |
| /** | |
| * Calculate LPC coefficients based on cutoff frequency and sample rate. | |
| * | |
| * @param cutoff cutoff frequency | |
| * @param sample_rate sample rate | |
| * @param bits number of bits used to quantize coefficients | |
| * @param[out] coeff 2 quantized LPC coefficients | |
| */ | |
| void ff_adx_calculate_coeffs(int cutoff, int sample_rate, int bits, int *coeff); | |