replaygain_synthesis.h - vx32 - Local 9vx git repository for patches.
 (HTM) git clone git://r-36.net/vx32
 (DIR) Log
 (DIR) Files
 (DIR) Refs
       ---
       replaygain_synthesis.h (2159B)
       ---
            1 /* replaygain_synthesis - Routines for applying ReplayGain to a signal
            2  * Copyright (C) 2002,2003,2004,2005  Josh Coalson
            3  *
            4  * This program is free software; you can redistribute it and/or
            5  * modify it under the terms of the GNU General Public License
            6  * as published by the Free Software Foundation; either version 2
            7  * of the License, or (at your option) any later version.
            8  *
            9  * This program is distributed in the hope that it will be useful,
           10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
           11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
           12  * GNU General Public License for more details.
           13  *
           14  * You should have received a copy of the GNU General Public License
           15  * along with this program; if not, write to the Free Software
           16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
           17  */
           18 
           19 #ifndef FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H
           20 #define FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H
           21 
           22 #include <stdlib.h> /* for size_t */
           23 #include "FLAC/ordinals.h"
           24 
           25 #define FLAC_SHARE__MAX_SUPPORTED_CHANNELS 2
           26 
           27 typedef enum {
           28         NOISE_SHAPING_NONE = 0,
           29         NOISE_SHAPING_LOW = 1,
           30         NOISE_SHAPING_MEDIUM = 2,
           31         NOISE_SHAPING_HIGH = 3
           32 } NoiseShaping;
           33 
           34 typedef struct {
           35         const float*  FilterCoeff;
           36         FLAC__uint64  Mask;
           37         double        Add;
           38         float         Dither;
           39         float         ErrorHistory     [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16];  /* 16th order Noise shaping */
           40         float         DitherHistory    [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16];
           41         int           LastRandomNumber [FLAC_SHARE__MAX_SUPPORTED_CHANNELS];
           42         unsigned      LastHistoryIndex;
           43         NoiseShaping  ShapingType;
           44 } DitherContext;
           45 
           46 void FLAC__replaygain_synthesis__init_dither_context(DitherContext *dither, int bits, int shapingtype);
           47 
           48 /* scale = (float) pow(10., (double)replaygain * 0.05); */
           49 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);
           50 
           51 #endif