codecs_v2/audio/aac/dec/src/decode_noise_floorlevels.cpp

/* ------------------------------------------------------------------
 * Copyright (C) 2008 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: decode_noise_floorlevels.c

     Date: 07/21/2003

------------------------------------------------------------------------------
 REVISION HISTORY


 Description:

------------------------------------------------------------------------------
 INPUT AND OUTPUT DEFINITIONS



------------------------------------------------------------------------------
 FUNCTION DESCRIPTION


------------------------------------------------------------------------------
 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 2002.

------------------------------------------------------------------------------
 PSEUDO-CODE

------------------------------------------------------------------------------
*/

#ifdef AAC_PLUS

/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include    "decode_noise_floorlevels.h"
#include    "sbr_constants.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
----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------
; 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
----------------------------------------------------------------------------*/

void decode_noise_floorlevels(SBR_FRAME_DATA * hFrameData)

{
    Int32 env;
    Int32 i;

    Int32 * frameInfo           = (Int32 *) & (hFrameData->frameInfo);
    Int32   nNfb                =   hFrameData->nNfb;
    Int32 * domain_vec          = (Int32 *) & (hFrameData->domain_vec2);

    Int32 * sbrNoiseFloorLevel_man = (Int32 *) & (hFrameData->sbrNoiseFloorLevel_man);
    Int32 * prevNoiseLevel_man     = (Int32 *) & (hFrameData->prevNoiseLevel_man);

    Int32 nEnv = frameInfo[(frameInfo[0] << 1) + 3];

    for (env = 0; env < nEnv; env++)
    {
        if (domain_vec[env] == 0)
        {
            prevNoiseLevel_man[0] = *(sbrNoiseFloorLevel_man++);

            for (i = 1; i < nNfb; i++)
            {
                *sbrNoiseFloorLevel_man += *(sbrNoiseFloorLevel_man - 1);
                prevNoiseLevel_man[i] = *(sbrNoiseFloorLevel_man++);
            }
        }
        else
        {
            for (i = 0; i < nNfb; i++)
            {
                *sbrNoiseFloorLevel_man += prevNoiseLevel_man[i];
                prevNoiseLevel_man[i] = *(sbrNoiseFloorLevel_man++);
            }
        }

    }
}

#endif