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author | Andreas Huber <andih@google.com> | 2009-12-07 09:56:32 -0800 |
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committer | Andreas Huber <andih@google.com> | 2009-12-07 11:02:28 -0800 |
commit | dacaa73ae5010b66f4224d70a520945e5b653544 (patch) | |
tree | a2c9e71b6337dd25d149bd5fa43f7a782e9387fb /media/libstagefright/codecs/aacdec/sbr_envelope_unmapping.cpp | |
parent | 5921fb51e0219ddd7cad439a73495f320c57d50e (diff) | |
download | frameworks_base-dacaa73ae5010b66f4224d70a520945e5b653544.zip frameworks_base-dacaa73ae5010b66f4224d70a520945e5b653544.tar.gz frameworks_base-dacaa73ae5010b66f4224d70a520945e5b653544.tar.bz2 |
Initial check in of stagefright software AAC decoder based on PV source code.
Diffstat (limited to 'media/libstagefright/codecs/aacdec/sbr_envelope_unmapping.cpp')
-rw-r--r-- | media/libstagefright/codecs/aacdec/sbr_envelope_unmapping.cpp | 427 |
1 files changed, 427 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/sbr_envelope_unmapping.cpp b/media/libstagefright/codecs/aacdec/sbr_envelope_unmapping.cpp new file mode 100644 index 0000000..7fce46b --- /dev/null +++ b/media/libstagefright/codecs/aacdec/sbr_envelope_unmapping.cpp @@ -0,0 +1,427 @@ +/* ------------------------------------------------------------------ + * 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 + |