| /* |
| * ReplayGainAnalysis - analyzes input samples and give the recommended dB |
| * change Copyright (C) 2001 David Robinson and Glen Sawyer |
| * |
| * This library 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. |
| * |
| * This library 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 this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 |
| * USA |
| * |
| * concept and filter values by David Robinson (David@Robinson.org) |
| * -- blame him if you think the idea is flawed |
| * coding by Glen Sawyer (glensawyer@hotmail.com) 442 N 700 E, Provo, UT 84606 |
| * USA |
| * -- blame him if you think this runs too slowly, or the coding is otherwise |
| * flawed minor cosmetic tweaks to integrate with FLAC by Josh Coalson |
| * |
| * For an explanation of the concepts and the basic algorithms involved, go to: |
| * http://www.replaygain.org/ |
| */ |
| |
| #ifndef GAIN_ANALYSIS_H |
| #define GAIN_ANALYSIS_H |
| |
| #include <stddef.h> |
| |
| #define GAIN_NOT_ENOUGH_SAMPLES -24601 |
| #define GAIN_ANALYSIS_ERROR 0 |
| #define GAIN_ANALYSIS_OK 1 |
| |
| #define INIT_GAIN_ANALYSIS_ERROR 0 |
| #define INIT_GAIN_ANALYSIS_OK 1 |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| typedef float flac_float_t; /* Type used for filtering */ |
| |
| extern flac_float_t |
| ReplayGainReferenceLoudness; /* in dB SPL, currently == 89.0 */ |
| |
| int InitGainAnalysis(long samplefreq); |
| int ValidGainFrequency(long samplefreq); |
| int AnalyzeSamples(const flac_float_t* left_samples, |
| const flac_float_t* right_samples, |
| size_t num_samples, |
| int num_channels); |
| flac_float_t GetTitleGain(void); |
| flac_float_t GetAlbumGain(void); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* GAIN_ANALYSIS_H */ |
