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Diffstat (limited to 'media/libstagefright/codecs/aacdec/init_sbr_dec.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/init_sbr_dec.cpp | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/init_sbr_dec.cpp b/media/libstagefright/codecs/aacdec/init_sbr_dec.cpp new file mode 100644 index 0000000..fc47dd3 --- /dev/null +++ b/media/libstagefright/codecs/aacdec/init_sbr_dec.cpp @@ -0,0 +1,192 @@ +/* ------------------------------------------------------------------ + * 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: init_sbr_dec.c + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Who: Date: MM/DD/YYYY + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + initializes sbr decoder structure +------------------------------------------------------------------------------ + 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 "init_sbr_dec.h" +#include "aac_mem_funcs.h" +#include "extractframeinfo.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 +----------------------------------------------------------------------------*/ + +Int32 init_sbr_dec(Int32 codecSampleRate, + Int upsampleFac, + SBR_DEC *sbrDec, + SBR_FRAME_DATA *hFrameData) +{ + Int32 outFrameSize; + Int32 coreCodecFrameSize = 1024; +#ifdef HQ_SBR + Int32 i; +#endif + + + sbrDec->sbStopCodec = upsampleFac << 5; + sbrDec->prevLowSubband = upsampleFac << 5; + + + /* set sbr sampling frequency */ + sbrDec->outSampleRate = 2 * codecSampleRate; + outFrameSize = upsampleFac * coreCodecFrameSize; + + hFrameData->nSfb[LO] = 0; /* number of scale factor bands for high resp.low frequency resolution */ + hFrameData->nSfb[HI] = 0; + hFrameData->offset = 0; + + hFrameData->nNfb = hFrameData->sbr_header.noNoiseBands; + hFrameData->prevEnvIsShort = -1; + + /* Initializes pointers */ +#ifdef HQ_SBR + for (i = 0; i < 5; i++) + { + hFrameData->fBuf_man[i] = hFrameData->fBuffer_man[i]; + hFrameData->fBufN_man[i] = hFrameData->fBufferN_man[i]; + hFrameData->fBuf_exp[i] = hFrameData->fBuffer_exp[i]; + hFrameData->fBufN_exp[i] = hFrameData->fBufferN_exp[i]; + } +#endif + + + pv_memset((void *)hFrameData->sbr_invf_mode_prev, + 0, + MAX_NUM_NOISE_VALUES*sizeof(INVF_MODE)); + + /* Direct assignments */ + + sbrDec->noCols = 32; + + sbrDec->bufWriteOffs = 6 + 2; + sbrDec->bufReadOffs = 2; + sbrDec->qmfBufLen = sbrDec->noCols + sbrDec->bufWriteOffs; + + sbrDec->lowBandAddSamples = 288; + + sbrDec->startIndexCodecQmf = 0; + + sbrDec->lowSubband = 32; + + + return outFrameSize; +} + +#endif + |