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Diffstat (limited to 'media/libstagefright/codecs/aacdec/sbr_create_limiter_bands.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/sbr_create_limiter_bands.cpp | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/sbr_create_limiter_bands.cpp b/media/libstagefright/codecs/aacdec/sbr_create_limiter_bands.cpp new file mode 100644 index 0000000..9472ffc --- /dev/null +++ b/media/libstagefright/codecs/aacdec/sbr_create_limiter_bands.cpp @@ -0,0 +1,253 @@ +/* ------------------------------------------------------------------ + * 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_create_limiter_bands.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_create_limiter_bands.h" +#include "shellsort.h" +#include "s_patch.h" +#include "pv_log2.h" + +#include "fxp_mul32.h" + +#define R_SHIFT 29 +#define Q_fmt(x) (Int32)(x*((Int32)1<<R_SHIFT) + (x>=0?0.5F:-0.5F)) + + +/*---------------------------------------------------------------------------- +; 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 sbr_create_limiter_bands(Int32 limSbc[][13], + Int32 *gateMode, + Int *freqTable, + struct PATCH Patch, + const Int32 noBands) +{ + Int32 i; + Int32 j; + Int32 k; + Int isPatchBorder[2]; + Int32 patchBorders[MAX_NUM_PATCHES + 1]; + Int32 workLimiterBandTable[32 + MAX_NUM_PATCHES + 1]; + + Int32 nOctaves; + const Int32 limiterBandsPerOctave[4] = + {Q_fmt(0.0F), Q_fmt(1.2F), + Q_fmt(2.0F), Q_fmt(3.0F) + }; + + Int32 tmp_q1; + + Int32 noPatches = Patch.noOfPatches; + Int32 lowSubband = freqTable[0]; + Int32 highSubband = freqTable[noBands]; + + + for (i = 0; i < noPatches; i++) + { + patchBorders[i] = Patch.targetStartBand[i] - lowSubband; + } + patchBorders[i] = highSubband - lowSubband; + + /* First band: 1 limiter band. */ + limSbc[0][0] = freqTable[0] - lowSubband; + limSbc[0][1] = freqTable[noBands] - lowSubband; + gateMode[0] = 1; + + /* Next three bands: 1.2, 2, 3 limiter bands/octave plus bandborders at patchborders. */ + for (i = 1; i < 4; i++) + { + + for (k = 0; k <= noBands; k++) + { + workLimiterBandTable[k] = freqTable[k] - lowSubband; + } + + for (k = 1; k < noPatches; k++) + { + workLimiterBandTable[noBands+k] = patchBorders[k]; + } + + gateMode[i] = noBands + noPatches - 1; + shellsort(workLimiterBandTable, gateMode[i] + 1); + + for (j = 1; j <= gateMode[i]; j++) + { + tmp_q1 = ((workLimiterBandTable[j] + lowSubband) << 20) / (workLimiterBandTable[j-1] + lowSubband); + + nOctaves = pv_log2(tmp_q1); + + tmp_q1 = fxp_mul32_Q20(nOctaves, limiterBandsPerOctave[i]); + if (tmp_q1 < Q_fmt(0.49)) + { + if (workLimiterBandTable[j] == workLimiterBandTable[j-1]) + { + workLimiterBandTable[j] = highSubband; + shellsort(workLimiterBandTable, gateMode[i] + 1); + gateMode[i]--; + j--; + continue; + } + + isPatchBorder[0] = isPatchBorder[1] = 0; + + for (k = 0; k <= noPatches; k++) + { + if (workLimiterBandTable[j-1] == patchBorders[k]) + { + isPatchBorder[0] = 1; + break; + } + } + + for (k = 0; k <= noPatches; k++) + { + if (workLimiterBandTable[j] == patchBorders[k]) + { + isPatchBorder[1] = 1; + break; + } + } + + if (!isPatchBorder[1]) + { + workLimiterBandTable[j] = highSubband; + shellsort(workLimiterBandTable, gateMode[i] + 1); + gateMode[i]--; + j--; + } + else if (!isPatchBorder[0]) + { + workLimiterBandTable[j-1] = highSubband; + shellsort(workLimiterBandTable, gateMode[i] + 1); + gateMode[i]--; + j--; + } + } + } + for (k = 0; k <= gateMode[i]; k++) + { + limSbc[i][k] = workLimiterBandTable[k]; + } + } +} + + + +#endif + |