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ps_init_stereo_mixing.cpp
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ps_init_stereo_mixing.cpp
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/* ------------------------------------------------------------------
* Copyright (C) 1998-2009 PacketVideo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
/*
Filename: ps_init_stereo_mixing.c
------------------------------------------------------------------------------
REVISION HISTORY
Who: Date: MM/DD/YYYY
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
initialize mixing procedure type Ra, type Rb is not supported
------------------------------------------------------------------------------
REQUIREMENTS
------------------------------------------------------------------------------
REFERENCES
SC 29 Software Copyright Licencing Disclaimer:
This software module was originally developed by
Coding Technologies
and edited by
-
in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3
standards for reference purposes and its performance may not have been
optimized. This software module is an implementation of one or more tools as
specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards.
ISO/IEC gives users free license to this software module or modifications
thereof for use in products claiming conformance to audiovisual and
image-coding related ITU Recommendations and/or ISO/IEC International
Standards. ISO/IEC gives users the same free license to this software module or
modifications thereof for research purposes and further ISO/IEC standardisation.
Those intending to use this software module in products are advised that its
use may infringe existing patents. ISO/IEC have no liability for use of this
software module or modifications thereof. Copyright is not released for
products that do not conform to audiovisual and image-coding related ITU
Recommendations and/or ISO/IEC International Standards.
The original developer retains full right to modify and use the code for its
own purpose, assign or donate the code to a third party and to inhibit third
parties from using the code for products that do not conform to audiovisual and
image-coding related ITU Recommendations and/or ISO/IEC International Standards.
This copyright notice must be included in all copies or derivative works.
Copyright (c) ISO/IEC 2003.
------------------------------------------------------------------------------
PSEUDO-CODE
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#ifdef AAC_PLUS
#ifdef PARAMETRICSTEREO
#include "pv_audio_type_defs.h"
#include "fxp_mul32.h"
#include "aac_mem_funcs.h"
#include "pv_sine.h"
#include "s_ps_dec.h"
#include "ps_all_pass_filter_coeff.h"
#include "ps_init_stereo_mixing.h"
/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here. Include conditional
; compile variables also.
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL FUNCTION DEFINITIONS
; Function Prototype declaration
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL STORE/BUFFER/POINTER DEFINITIONS
; Variable declaration - defined here and used outside this module
----------------------------------------------------------------------------*/
/*
;
; c(b) = 10^(iid(b)/20)
;
; Intensity differences
;
; sqrt(2)
; c_1(b) = ----------------
; sqrt( 1 + c^2(b))
;
; sqrt(2)*c(b)
; c_2(b) = ----------------
; sqrt( 1 + c^2(b))
;
*/
#define R_SHIFT 30
#define Q30_fmt(x) (Int32)(x*((Int32)1<<R_SHIFT) + (x>=0?0.5F:-0.5F))
const Int32 scaleFactors[NO_IID_LEVELS] =
{
Q30_fmt(1.411983f), Q30_fmt(1.403138f), Q30_fmt(1.386877f),
Q30_fmt(1.348400f), Q30_fmt(1.291249f), Q30_fmt(1.196037f),
Q30_fmt(1.107372f), Q30_fmt(1.000000f), Q30_fmt(0.879617f),
Q30_fmt(0.754649f), Q30_fmt(0.576780f), Q30_fmt(0.426401f),
Q30_fmt(0.276718f), Q30_fmt(0.176645f), Q30_fmt(0.079402f)
};
const Int32 scaleFactorsFine[NO_IID_LEVELS_FINE] =
{
Q30_fmt(1.414207f), Q30_fmt(1.414191f), Q30_fmt(1.414143f),
Q30_fmt(1.413990f), Q30_fmt(1.413507f), Q30_fmt(1.411983f),
Q30_fmt(1.409773f), Q30_fmt(1.405395f), Q30_fmt(1.396780f),
Q30_fmt(1.380053f), Q30_fmt(1.348400f), Q30_fmt(1.313920f),
Q30_fmt(1.264310f), Q30_fmt(1.196037f), Q30_fmt(1.107372f),
Q30_fmt(1.000000f), Q30_fmt(0.879617f), Q30_fmt(0.754649f),
Q30_fmt(0.633656f), Q30_fmt(0.523081f), Q30_fmt(0.426401f),
Q30_fmt(0.308955f), Q30_fmt(0.221375f), Q30_fmt(0.157688f),
Q30_fmt(0.111982f), Q30_fmt(0.079402f), Q30_fmt(0.044699f),
Q30_fmt(0.025145f), Q30_fmt(0.014141f), Q30_fmt(0.007953f),
Q30_fmt(0.004472f)
};
/*
* alphas ranged between 0 and pi/2
* alpha(b) = (1/2)*arccos( gamma(b))
*
* b 0 1 2 3 4 5 6 7
* gamma 1 0.937 0.84118 0.60092 0.36764 0 -0.589 -1
*
*/
const Int32 scaled_alphas[NO_ICC_LEVELS] =
{
Q30_fmt(0.00000000000000f), Q30_fmt(0.12616764875355f),
Q30_fmt(0.20199707286122f), Q30_fmt(0.32744135137762f),
Q30_fmt(0.42225800677370f), Q30_fmt(0.55536025173035f),
Q30_fmt(0.77803595530059f), Q30_fmt(1.11072050346071f)
};
const Int32 cos_alphas[NO_ICC_LEVELS] =
{
Q30_fmt(1.00000000000000f), Q30_fmt(0.98412391153249f),
Q30_fmt(0.95947390717984f), Q30_fmt(0.89468446298319f),
Q30_fmt(0.82693418207478f), Q30_fmt(0.70710689672598f),
Q30_fmt(0.45332071670080f), Q30_fmt(0.00000032679490f)
};
const Int32 sin_alphas[NO_ICC_LEVELS] =
{
Q30_fmt(0.00000000000000f), Q30_fmt(0.17748275057029f),
Q30_fmt(0.28179748302823f), Q30_fmt(0.44669868110000f),
Q30_fmt(0.56229872711603f), Q30_fmt(0.70710666564709f),
Q30_fmt(0.89134747871404f), Q30_fmt(1.00000000000000f)
};
/*----------------------------------------------------------------------------
; EXTERNAL FUNCTION REFERENCES
; Declare functions defined elsewhere and referenced in this module
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
; Declare variables used in this module but defined elsewhere
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
Int32 ps_init_stereo_mixing(STRUCT_PS_DEC *pms,
Int32 env,
Int32 usb)
{
Int32 group;
Int32 bin;
Int32 noIidSteps;
Int32 tmp;
Int32 invEnvLength;
const Int32 *pScaleFactors;
Int32 scaleR;
Int32 scaleL;
Int32 cos_alpha;
Int32 sin_alpha;
Int32 beta;
Int32 cos_beta;
Int32 sin_beta;
Int32 temp1;
Int32 temp2;
Int32 *ptr_tmp;
Int32 h11;
Int32 h12;
Int32 h21;
Int32 h22;
if (pms->bFineIidQ)
{
noIidSteps = NO_IID_STEPS_FINE; /* NO_IID_STEPS_FINE == 15 */
pScaleFactors = scaleFactorsFine;
}
else
{
noIidSteps = NO_IID_STEPS; /* NO_IID_STEPS == 7 */
pScaleFactors = scaleFactors;
}
if (env == 0)
{
pms->lastUsb = pms->usb;
pms->usb = usb;
if (usb != pms->lastUsb && pms->lastUsb != 0)
{
return(-1);
}
}
invEnvLength = pms->aEnvStartStop[env + 1] - pms->aEnvStartStop[env];
if (invEnvLength == (Int32) pms->noSubSamples)
{
invEnvLength = pms->invNoSubSamples;
}
else
{
invEnvLength = Q30_fmt(1.0f) / invEnvLength;
}
if (invEnvLength == 32) /* more likely value */
{
for (group = 0; group < NO_IID_GROUPS; group++) /* == 22 */
{
bin = bins2groupMap[group];
/*
* c(b) = 10^(iid(b)/20)
*/
tmp = pms->aaIidIndex[env][bin];
/*
* Intensity differences
*
* sqrt(2)
* c_1(b) = ----------------
* sqrt( 1 + c^2(b))
*
*/
scaleR = pScaleFactors[noIidSteps + tmp];
/*
* sqrt(2)*c(b)
* c_2(b) = ----------------
* sqrt( 1 + c^2(b))
*
*/
scaleL = pScaleFactors[noIidSteps - tmp];
/*
* alpha(b) = (1/2)*arccos( gamma(b))
*/
tmp = pms->aaIccIndex[env][bin];
cos_alpha = cos_alphas[ tmp];
sin_alpha = sin_alphas[ tmp];
/*
* beta(b) = alpha(b)/sqrt(2)*( c_1(b) - c_2(b))
*/
beta = fxp_mul32_Q30(scaled_alphas[ tmp], (scaleR - scaleL));
cos_beta = pv_cosine(beta);
sin_beta = pv_sine(beta);
temp1 = fxp_mul32_Q30(cos_beta, cos_alpha);
temp2 = fxp_mul32_Q30(sin_beta, sin_alpha);
/*
* h11(b) = cos( alpha(b) + beta(b))* c_2(b)
* h12(b) = cos( beta(b) - alpha(b))* c_1(b)
*/
h11 = fxp_mul32_Q30(scaleL, (temp1 - temp2));
h12 = fxp_mul32_Q30(scaleR, (temp1 + temp2));
temp1 = fxp_mul32_Q30(sin_beta, cos_alpha);
temp2 = fxp_mul32_Q30(cos_beta, sin_alpha);
/*
* h21(b) = sin( alpha(b) + beta(b))* c_2(b)
* h22(b) = sin( beta(b) - alpha(b))* c_1(b)
*/
h21 = fxp_mul32_Q30(scaleL, (temp1 + temp2));
h22 = fxp_mul32_Q30(scaleR, (temp1 - temp2));
/*
* Linear interpolation
*
* Hij(k, n_e+1) - Hij(k, n_e)
* Hij(k,n) = Hij(k, n_e) + (n - n_e)*---------------------------
* n_e+1 - n_e
*/
ptr_tmp = &pms->h11Prev[group];
pms->H11[group] = *ptr_tmp;
pms->deltaH11[group] = (h11 - *ptr_tmp) >> 5;
*ptr_tmp = h11;
ptr_tmp = &pms->h12Prev[group];
pms->H12[group] = *ptr_tmp;
pms->deltaH12[group] = (h12 - *ptr_tmp) >> 5;
*ptr_tmp = h12;
ptr_tmp = &pms->h21Prev[group];
pms->H21[group] = *ptr_tmp;
pms->deltaH21[group] = (h21 - *ptr_tmp) >> 5;
*ptr_tmp = h21;
ptr_tmp = &pms->h22Prev[group];
pms->H22[group] = *ptr_tmp;
pms->deltaH22[group] = (h22 - *ptr_tmp) >> 5;
*ptr_tmp = h22;
} /* groups loop */
}
else
{
for (group = 0; group < NO_IID_GROUPS; group++) /* == 22 */
{
bin = bins2groupMap[group];
/*
* c(b) = 10^(iid(b)/20)
*/
tmp = pms->aaIidIndex[env][bin];
/*
* Intensity differences
*
* sqrt(2)
* c_1(b) = ----------------
* sqrt( 1 + c^2(b))
*
*/
scaleR = pScaleFactors[noIidSteps + tmp];
/*
* sqrt(2)*c(b)
* c_2(b) = ----------------
* sqrt( 1 + c^2(b))
*
*/
scaleL = pScaleFactors[noIidSteps - tmp];
/*
* alpha(b) = (1/2)*arccos( gamma(b))
*/
tmp = pms->aaIccIndex[env][bin];
cos_alpha = cos_alphas[ tmp];
sin_alpha = sin_alphas[ tmp];
/*
* beta(b) = alpha(b)/sqrt(2)*( c_1(b) - c_2(b))
*/
beta = fxp_mul32_Q30(scaled_alphas[ tmp], (scaleR - scaleL));
cos_beta = pv_cosine(beta);
sin_beta = pv_sine(beta);
temp1 = fxp_mul32_Q30(cos_beta, cos_alpha);
temp2 = fxp_mul32_Q30(sin_beta, sin_alpha);
/*
* h11(b) = cos( alpha(b) + beta(b))* c_2(b)
* h12(b) = cos( beta(b) - alpha(b))* c_1(b)
*/
h11 = fxp_mul32_Q30(scaleL, (temp1 - temp2));
h12 = fxp_mul32_Q30(scaleR, (temp1 + temp2));
temp1 = fxp_mul32_Q30(sin_beta, cos_alpha);
temp2 = fxp_mul32_Q30(cos_beta, sin_alpha);
/*
* h21(b) = sin( alpha(b) + beta(b))* c_2(b)
* h22(b) = sin( beta(b) - alpha(b))* c_1(b)
*/
h21 = fxp_mul32_Q30(scaleL, (temp1 + temp2));
h22 = fxp_mul32_Q30(scaleR, (temp1 - temp2));
/*
* Linear interpolation
*
* Hij(k, n_e+1) - Hij(k, n_e)
* Hij(k,n) = Hij(k, n_e) + (n - n_e)*---------------------------
* n_e+1 - n_e
*/
ptr_tmp = &pms->h11Prev[group];
pms->deltaH11[group] = fxp_mul32_Q30((h11 - *ptr_tmp), invEnvLength);
pms->H11[group] = *ptr_tmp;
*ptr_tmp = h11;
ptr_tmp = &pms->h12Prev[group];
pms->deltaH12[group] = fxp_mul32_Q30((h12 - *ptr_tmp), invEnvLength);
pms->H12[group] = *ptr_tmp;
*ptr_tmp = h12;
ptr_tmp = &pms->h21Prev[group];
pms->deltaH21[group] = fxp_mul32_Q30((h21 - *ptr_tmp), invEnvLength);
pms->H21[group] = *ptr_tmp;
*ptr_tmp = h21;
ptr_tmp = &pms->h22Prev[group];
pms->deltaH22[group] = fxp_mul32_Q30((h22 - *ptr_tmp), invEnvLength);
pms->H22[group] = *ptr_tmp;
*ptr_tmp = h22;
} /* groups loop */
}
return (0);
} /* END ps_init_stereo_mixing */
#endif
#endif