| /* ------------------------------------------------------------------ |
| * 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_envelope_unmapping.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_envelope_unmapping.h" |
| #include "sbr_constants.h" |
| |
| #include "fxp_mul32.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 |
| ----------------------------------------------------------------------------*/ |
| |
| #define R_SHIFT 30 |
| #define Qfmt(x) (Int32)(x*((Int32)1<<R_SHIFT) + (x>=0?0.5F:-0.5F)) |
| |
| /* |
| * 1./(1+2.^-[0:10]) |
| */ |
| const Int32 one_over_one_plus_two_to_n[11] = |
| { |
| Qfmt(0.50000000000000F), Qfmt(0.66666666666667F), Qfmt(0.80000000000000F), |
| Qfmt(0.88888888888889F), Qfmt(0.94117647058824F), Qfmt(0.96969696969697F), |
| Qfmt(0.98461538461538F), Qfmt(0.99224806201550F), Qfmt(0.99610894941634F), |
| Qfmt(0.99805068226121F), Qfmt(0.99902439024390F) |
| }; |
| |
| /* |
| * 1./(1+2.^[0.5:-1:-10.5]) |
| */ |
| const Int32 one_over_one_plus_sq_2_by_two_to_n[12] = |
| { |
| Qfmt(0.41421356237310F), Qfmt(0.58578643762690F), Qfmt(0.73879612503626F), |
| Qfmt(0.84977889517767F), Qfmt(0.91878969685839F), Qfmt(0.95767628767521F), |
| Qfmt(0.97838063800882F), Qfmt(0.98907219289563F), Qfmt(0.99450607818892F), |
| Qfmt(0.99724547251514F), Qfmt(0.99862083678608F), Qfmt(0.99930994254211F) |
| }; |
| |
| /*---------------------------------------------------------------------------- |
| ; 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_envelope_unmapping(SBR_FRAME_DATA * hFrameData1, |
| SBR_FRAME_DATA * hFrameData2) |
| |
| { |
| Int32 i; |
| Int32 tempLeft; |
| Int32 tempRight; |
| |
| Int32 tmp; |
| Int32 *iEnvelopeLeft_man = hFrameData1->iEnvelope_man; |
| Int32 *iEnvelopeLeft_exp = hFrameData1->iEnvelope_exp; |
| Int32 *noiseFloorLeft_man = hFrameData1->sbrNoiseFloorLevel_man; |
| Int32 *noiseFloorLeft_exp = hFrameData1->sbrNoiseFloorLevel_exp; |
| |
| Int32 *iEnvelopeRight_man = hFrameData2->iEnvelope_man; |
| Int32 *iEnvelopeRight_exp = hFrameData2->iEnvelope_exp; |
| Int32 *noiseFloorRight_man = hFrameData2->sbrNoiseFloorLevel_man; |
| Int32 *noiseFloorRight_exp = hFrameData2->sbrNoiseFloorLevel_exp; |
| |
| |
| if (hFrameData2->ampRes) |
| { |
| for (i = 0; i < hFrameData1->nScaleFactors; i++) |
| { |
| tempRight = iEnvelopeRight_man[i]; |
| tempLeft = iEnvelopeLeft_man[i]; |
| /* iEnvelope[i] always positive 6 bits max */ |
| |
| iEnvelopeLeft_exp[i] = tempLeft + 7; |
| |
| iEnvelopeRight_exp[i] = tempRight - 12; |
| iEnvelopeRight_man[i] = Qfmt(1.000F); |
| |
| /* |
| * iEnvelopeRight[i] = tempLeft / (1 + tempRight); |
| * iEnvelopeLeft[i] = tempRight * iEnvelopeRight[i]; |
| * |
| * |
| * iEnvelopeRight[i] = k*2^n/(1+2^m) = k*2^(n-m)/(1 + 2^-m); |
| * where k = 1 or sqrt(2) |
| */ |
| if (iEnvelopeRight_exp[i] >= 0) |
| { |
| if (iEnvelopeRight_exp[i] < 11) |
| { |
| iEnvelopeRight_man[i] = one_over_one_plus_two_to_n[ iEnvelopeRight_exp[i]]; |
| } |
| else /* 1/(1+2^-m) == 1 - 2^-m ; for m >= 10 */ |
| { |
| iEnvelopeRight_man[i] -= (Qfmt(1.000F) >> iEnvelopeRight_exp[i]); |
| } |
| iEnvelopeRight_exp[i] = iEnvelopeLeft_exp[i] - iEnvelopeRight_exp[i]; |
| } |
| else |
| { |
| if (iEnvelopeRight_exp[i] > -11) |
| { |
| iEnvelopeRight_man[i] -= one_over_one_plus_two_to_n[ -iEnvelopeRight_exp[i]]; |
| iEnvelopeRight_exp[i] = iEnvelopeLeft_exp[i] - iEnvelopeRight_exp[i]; |
| |
| } |
| else /* 1/(1+2^m) == 2^-m ; for m >= 10 */ |
| { |
| iEnvelopeRight_exp[i] = iEnvelopeLeft_exp[i]; |
| iEnvelopeLeft_exp[i] = 0; |
| } |
| } |
| |
| iEnvelopeLeft_man[i] = iEnvelopeRight_man[i]; |
| } |
| } |
| else |
| { |
| for (i = 0; i < hFrameData1->nScaleFactors; i++) |
| { |
| /* iEnvelope[i] always positive 7 bits max */ |
| tempRight = iEnvelopeRight_man[i]; |
| tempLeft = iEnvelopeLeft_man[i]; |
| |
| iEnvelopeLeft_exp[i] = (tempLeft >> 1) + 7; |
| if (tempLeft & 0x1) /* odd */ |
| { |
| iEnvelopeLeft_man[i] = Qfmt(1.41421356237310F); |
| } |
| else |
| { |
| iEnvelopeLeft_man[i] = Qfmt(1.000F); |
| } |
| |
| iEnvelopeRight_exp[i] = (tempRight >> 1) - 12; |
| if (tempRight & 0x1) /* odd */ |
| { |
| if (iEnvelopeRight_exp[i] > 0) |
| { |
| iEnvelopeRight_man[i] = Qfmt(1.41421356237310F); |
| } |
| else |
| { |
| iEnvelopeRight_man[i] = Qfmt(0.7071067811865F); |
| } |
| } |
| else |
| { |
| iEnvelopeRight_man[i] = Qfmt(1.000F); |
| } |
| |
| if (iEnvelopeRight_man[i] == Qfmt(1.000F)) |
| { |
| |
| /* |
| * iEnvelopeRight[i] = tempLeft / (1 + tempRight); |
| * iEnvelopeLeft[i] = tempRight * iEnvelopeRight[i]; |
| * |
| * |
| * iEnvelopeRight[i] = k*2^n/(1+2^m) = k*2^(n-m)/(1 + 2^-m); |
| * where k = 1 or sqrt(2) |
| */ |
| if (iEnvelopeRight_exp[i] >= 0) |
| { |
| if (iEnvelopeRight_exp[i] < 11) |
| { |
| iEnvelopeRight_man[i] = one_over_one_plus_two_to_n[ iEnvelopeRight_exp[i]]; |
| } |
| else /* 1/(1+2^-m) == 1 - 2^-m ; for m >= 10 */ |
| { |
| iEnvelopeRight_man[i] -= (Qfmt(1.000F) >> iEnvelopeRight_exp[i]); |
| } |
| iEnvelopeRight_exp[i] = iEnvelopeLeft_exp[i] - iEnvelopeRight_exp[i]; |
| |
| } |
| else |
| { |
| if (iEnvelopeRight_exp[i] > -11) |
| { |
| iEnvelopeRight_man[i] -= one_over_one_plus_two_to_n[ -iEnvelopeRight_exp[i]]; |
| iEnvelopeRight_exp[i] = iEnvelopeLeft_exp[i] - iEnvelopeRight_exp[i]; |
| } |
| else /* 1/(1+2^m) == 2^-m ; for m >= 10 */ |
| { |
| iEnvelopeRight_exp[i] = iEnvelopeLeft_exp[i]; |
| iEnvelopeLeft_exp[i] = 0; |
| } |
| } |
| |
| /* |
| * apply "k" factor 1 or sqrt(2) |
| * |
| * (2^m)*2*k*2^n/(1+2^m) = k*2^(n+1)/(1 + 2^-m); |
| * |
| */ |
| if (iEnvelopeLeft_man[i] != Qfmt(1.000F)) |
| { |
| iEnvelopeRight_man[i] = fxp_mul32_Q30(iEnvelopeLeft_man[i], iEnvelopeRight_man[i]); |
| } |
| |
| iEnvelopeLeft_man[i] = iEnvelopeRight_man[i]; |
| |
| } |
| else |
| { |
| |
| /* |
| * iEnvelopeRight[i] = tempLeft / (1 + tempRight); |
| * iEnvelopeLeft[i] = tempRight * iEnvelopeRight[i]; |
| * |
| * |
| * iEnvelopeRight[i] = k*2^n/(1+q2^m) = k*2^(n-m)/(1 + q2^-m); |
| * where k = 1 or sqrt(2) |
| * and q = sqrt(2) |
| */ |
| if (iEnvelopeRight_exp[i] >= 0) |
| { |
| if (iEnvelopeRight_exp[i] < 12) |
| { |
| iEnvelopeRight_man[i] = one_over_one_plus_sq_2_by_two_to_n[ iEnvelopeRight_exp[i]]; |
| } |
| else /* 1/(1+2^-m) == 1 - 2^-m ; for m >= 11 */ |
| { |
| iEnvelopeRight_man[i] = Qfmt(1.000F) - (Qfmt(1.000F) >> iEnvelopeRight_exp[i]); |
| } |
| } |
| else |
| { |
| if (iEnvelopeRight_exp[i] > -12) |
| { |
| iEnvelopeRight_man[i] = Qfmt(1.000F) - one_over_one_plus_sq_2_by_two_to_n[ -iEnvelopeRight_exp[i]]; |
| } |
| else /* 1/(1+2^m) == 2^-m ; for m >= 11 */ |
| { |
| iEnvelopeRight_man[i] = Qfmt(1.000F); |
| iEnvelopeRight_exp[i] = 0; |
| } |
| } |
| |
| iEnvelopeRight_exp[i] = iEnvelopeLeft_exp[i] - iEnvelopeRight_exp[i]; |
| |
| /* |
| * apply "k" factor 1 or sqrt(2) |
| * |
| * Right == k*2^(n-m)/(1 + q2^-m) |
| * Left == (q2^m)*k*2^n/(1 + q2^m) = qk*2^n/(1 + q2^-m); |
| */ |
| if (iEnvelopeLeft_man[i] != Qfmt(1.000F)) |
| { |
| /* |
| * k/(1 + q2^-m); |
| */ |
| tmp = iEnvelopeRight_man[i]; |
| iEnvelopeRight_man[i] = fxp_mul32_Q30(iEnvelopeLeft_man[i], iEnvelopeRight_man[i]); |
| iEnvelopeLeft_man[i] = tmp; |
| iEnvelopeLeft_exp[i] += 1; /* extra one due to sqrt(2)^2 */ |
| } |
| else |
| { |
| iEnvelopeLeft_man[i] = fxp_mul32_Q30(iEnvelopeRight_man[i], Qfmt(1.41421356237310F)); |
| } |
| |
| } /* end of if (iEnvelopeRight_man[i] == Qfmt( 1.000F) ) */ |
| } /* end of for loop */ |
| } /* end if (hFrameData2->ampRes) */ |
| |
| |
| for (i = 0; i < hFrameData1->nNoiseFactors; i++) |
| { |
| |
| noiseFloorLeft_exp[i] = NOISE_FLOOR_OFFSET_PLUS_1 - noiseFloorLeft_man[i]; |
| noiseFloorRight_exp[i] = noiseFloorRight_man[i] - SBR_ENERGY_PAN_OFFSET_INT; |
| |
| |
| /* |
| * noiseFloorRight[i] = tempLeft / (1.0f + tempRight); |
| * noiseFloorLeft[i] = tempRight*noiseFloorRight[i]; |
| * |
| * |
| * noiseFloorRight[i] = 2^n/(1+2^m) = 2^(n-m)/(1 + 2^-m); |
| */ |
| if (noiseFloorRight_exp[i] >= 0) |
| { |
| if (noiseFloorRight_exp[i] < 11) |
| { |
| noiseFloorRight_man[i] = one_over_one_plus_two_to_n[ noiseFloorRight_exp[i]]; |
| } |
| else /* 1/(1+2^-m) == 1 - 2^-m ; for m >= 10 */ |
| { |
| noiseFloorRight_man[i] = Qfmt(1.000F) - (Qfmt(1.000F) >> noiseFloorRight_exp[i]); |
| } |
| } |
| else |
| { |
| if (noiseFloorRight_exp[i] > -11) |
| { |
| noiseFloorRight_man[i] = Qfmt(1.000F) - one_over_one_plus_two_to_n[ -noiseFloorRight_exp[i]]; |
| } |
| else /* 1/(1+2^m) == 2^-m ; for m >= 10 */ |
| { |
| noiseFloorRight_man[i] = Qfmt(1.000F); |
| noiseFloorRight_exp[i] = 0; |
| } |
| } |
| |
| noiseFloorRight_exp[i] = noiseFloorLeft_exp[i] - noiseFloorRight_exp[i]; |
| |
| /* |
| * (2^m)*2^n/(1+2^m) = 2^n/(1 + 2^-m); |
| */ |
| |
| noiseFloorLeft_man[i] = noiseFloorRight_man[i]; |
| noiseFloorLeft_exp[i] = noiseFloorLeft_exp[i]; |
| |
| } |
| } |
| |
| #endif |
| |
