ref: d44e2d7e3a6e0cba9781f5366003212652d542e5
dir: /libfaac/aacquant.h/
/*
* FAAC - Freeware Advanced Audio Coder
* Copyright (C) 2001 Menno Bakker
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: aacquant.h,v 1.4 2001/06/08 18:01:09 menno Exp $
*/
#ifndef AACQUANT_H
#define AACQUANT_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#include "coder.h"
#include "psych.h"
#define IXMAX_VAL 8191
#define PRECALC_SIZE (IXMAX_VAL+2)
#define LARGE_BITS 100000
#define SF_OFFSET 100
#define POW20(x) pow(2.0,((double)x)*.25)
#define IPOW20(x) pow(2.0,-((double)x)*.1875)
typedef struct {
int over_count; /* number of quantization noise > masking */
int tot_count; /* all */
double over_noise; /* sum of quantization noise > masking */
double tot_noise; /* sum of all quantization noise */
double max_noise; /* max quantization noise */
} calcNoiseResult;
void AACQuantizeInit(CoderInfo *coderInfo, unsigned int numChannels);
void AACQuantizeEnd(CoderInfo *coderInfo, unsigned int numChannels);
int AACQuantize(CoderInfo *coderInfo,
PsyInfo *psyInfo,
ChannelInfo *channelInfo,
int *cb_width,
int num_cb,
double *xr,
int desired_rate);
static int SearchStepSize(CoderInfo *coderInfo,
const int desired_rate,
const double *xr,
int *xi);
static void Quantize(const double *xr, int *ix, double istep);
static int SortForGrouping(CoderInfo* coderInfo, PsyInfo *psyInfo,
ChannelInfo *channelInfo, int *sfb_width_table,
double *xr);
static int CountBitsLong(CoderInfo *coderInfo, int *xi);
static int CountBits(CoderInfo *coderInfo, int *ix, const double *xr);
static int InnerLoop(CoderInfo *coderInfo, double *xr_pow, int *xi, int max_bits);
static void CalcAllowedDist(PsyInfo *psyInfo, int *cb_width, int num_cb,
double *xr, double *xmin);
static int CalcNoise(CoderInfo *coderInfo, double *xr, int *xi, double *requant_xr,
double *error_energy, double *xmin, calcNoiseResult *res);
static int OuterLoop(CoderInfo *coderInfo, double *xr, double *xr_pow, int *xi,
double *xmin, int target_bits);
static int QuantCompare(calcNoiseResult *best,
calcNoiseResult *calc);
static int BalanceNoise(CoderInfo *coderInfo, double *distort, double *xrpow);
static void AmpScalefacBands(CoderInfo *coderInfo, double *distort, double *xr_pow);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* AACQUANT_H */