| 1 | /* replaygain_synthesis - Routines for applying ReplayGain to a signal |
| 2 | * Copyright (C) 2002-2009 Josh Coalson |
| 3 | * Copyright (C) 2011-2016 Xiph.Org Foundation |
| 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2.1 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | #ifndef FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H |
| 21 | #define FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H |
| 22 | |
| 23 | #include <stdlib.h> /* for size_t */ |
| 24 | #include "FLAC/format.h" |
| 25 | |
| 26 | #define FLAC_SHARE__MAX_SUPPORTED_CHANNELS FLAC__MAX_CHANNELS |
| 27 | |
| 28 | typedef enum { |
| 29 | NOISE_SHAPING_NONE = 0, |
| 30 | NOISE_SHAPING_LOW = 1, |
| 31 | NOISE_SHAPING_MEDIUM = 2, |
| 32 | NOISE_SHAPING_HIGH = 3 |
| 33 | } NoiseShaping; |
| 34 | |
| 35 | typedef struct { |
| 36 | const float* FilterCoeff; |
| 37 | FLAC__uint64 Mask; |
| 38 | double Add; |
| 39 | float Dither; |
| 40 | float ErrorHistory [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16]; /* 16th order Noise shaping */ |
| 41 | float DitherHistory [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16]; |
| 42 | int LastRandomNumber [FLAC_SHARE__MAX_SUPPORTED_CHANNELS]; |
| 43 | unsigned LastHistoryIndex; |
| 44 | NoiseShaping ShapingType; |
| 45 | } DitherContext; |
| 46 | |
| 47 | void FLAC__replaygain_synthesis__init_dither_context(DitherContext *dither, int bits, int shapingtype); |
| 48 | |
| 49 | /* scale = (float) pow(10., (double)replaygain * 0.05); */ |
| 50 | size_t FLAC__replaygain_synthesis__apply_gain(FLAC__byte *data_out, FLAC__bool little_endian_data_out, FLAC__bool unsigned_data_out, const FLAC__int32 * const input[], unsigned wide_samples, unsigned channels, const unsigned source_bps, const unsigned target_bps, const double scale, const FLAC__bool hard_limit, FLAC__bool do_dithering, DitherContext *dither_context); |
| 51 | |
| 52 | #endif |