| /* ------------------------------------------------------------------ |
| * 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: sbr_requantize_envelope_data.c |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Who: Date: MM/DD/YYYY |
| 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 |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| |
| #ifdef AAC_PLUS |
| |
| |
| #include "sbr_constants.h" |
| #include "sbr_requantize_envelope_data.h" |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. Include conditional |
| ; compile variables also. |
| ----------------------------------------------------------------------------*/ |
| #define R_SHIFT 30 |
| #define Qfmt(x) (Int32)(x*((Int32)1<<R_SHIFT) + (x>=0?0.5F:-0.5F)) |
| /*---------------------------------------------------------------------------- |
| ; 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 sbr_requantize_envelope_data(SBR_FRAME_DATA * hFrameData) |
| |
| { |
| Int32 i; |
| |
| |
| Int32 nScaleFactors = hFrameData->nScaleFactors; |
| Int32 nNoiseFactors = hFrameData->nNoiseFactors; |
| Int32 ampRes = hFrameData->ampRes; |
| Int32 *iEnvelope_man = hFrameData->iEnvelope_man; |
| Int32 *iEnvelope_exp = hFrameData->iEnvelope_exp; |
| Int32 *sbrNoiseFloorLevel_man = hFrameData->sbrNoiseFloorLevel_man; |
| Int32 *sbrNoiseFloorLevel_exp = hFrameData->sbrNoiseFloorLevel_exp; |
| |
| /* |
| * ampRes could be 0 (resolution step = 1.5 dB) or |
| * 1 (resolution step = 3 dB) |
| */ |
| if (ampRes) |
| { |
| /* iEnvelope[i] always positive 6 bits max */ |
| for (i = 0; i < nScaleFactors; i++) |
| { |
| |
| iEnvelope_exp[i] = iEnvelope_man[i] + 6; |
| iEnvelope_man[i] = Qfmt(1.000F); |
| } |
| } |
| else |
| { |
| /* iEnvelope[i] always positive 7 bits max */ |
| for (i = 0; i < nScaleFactors; i++) |
| { |
| iEnvelope_exp[i] = (iEnvelope_man[i] >> 1) + 6; |
| if (iEnvelope_man[i] & 0x1) /* odd */ |
| { |
| iEnvelope_man[i] = Qfmt(1.41421356237310F); |
| } |
| else |
| { |
| iEnvelope_man[i] = Qfmt(1.000F); |
| } |
| } |
| |
| } |
| for (i = 0; i < nNoiseFactors; i++) |
| { |
| /* sbrNoiseFloorLevel[i] varies from -31 to 31 if no coupling is used */ |
| |
| sbrNoiseFloorLevel_exp[i] = NOISE_FLOOR_OFFSET - sbrNoiseFloorLevel_man[i]; |
| sbrNoiseFloorLevel_man[i] = 0x40000000; |
| } |
| } |
| |
| #endif |
| |