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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_decode_envelope.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_decode_envelope.cpp')
-rw-r--r-- | media/libstagefright/codecs/aacdec/sbr_decode_envelope.cpp | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/sbr_decode_envelope.cpp b/media/libstagefright/codecs/aacdec/sbr_decode_envelope.cpp new file mode 100644 index 0000000..771bb32 --- /dev/null +++ b/media/libstagefright/codecs/aacdec/sbr_decode_envelope.cpp @@ -0,0 +1,286 @@ +/* ------------------------------------------------------------------ + * 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_decode_envelope.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_decode_envelope.h" +#include "sbr_constants.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 +----------------------------------------------------------------------------*/ +void mapLowResEnergyVal( + Int32 currVal, + Int32 *prevData, + Int32 offset, + Int32 index, + Int32 res); + +Int32 indexLow2High(Int32 offset, + Int32 index, + Int32 res); + +/*---------------------------------------------------------------------------- +; 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_decode_envelope(SBR_FRAME_DATA * hFrameData) + +{ + Int32 i; + Int32 no_of_bands; + Int32 band; + Int32 freqRes; + Int32 *iEnvelope = hFrameData->iEnvelope_man; + Int32 *sfb_nrg_prev = hFrameData->sfb_nrg_prev_man; + + Int32 offset = hFrameData->offset; + Int32 *nSfb = hFrameData->nSfb; + Int32 *domain_vec = hFrameData->domain_vec1; + Int32 *frameInfo = hFrameData->frameInfo; + + + + for (i = 0; i < frameInfo[0]; i++) + { + freqRes = frameInfo[frameInfo[0] + i + 2]; + no_of_bands = nSfb[freqRes]; + + if (domain_vec[i] == 0) + { + mapLowResEnergyVal(*iEnvelope, + sfb_nrg_prev, + offset, + 0, + freqRes); + iEnvelope++; + + for (band = 1; band < no_of_bands; band++) + { + *iEnvelope += *(iEnvelope - 1); + + mapLowResEnergyVal(*iEnvelope, + sfb_nrg_prev, + offset, + band, + freqRes); + iEnvelope++; + } + } + else + { + for (band = 0; band < no_of_bands; band++) + { + *iEnvelope += sfb_nrg_prev[ indexLow2High(offset, band, freqRes)]; + + mapLowResEnergyVal(*iEnvelope, + sfb_nrg_prev, + offset, + band, + freqRes); + iEnvelope++; + } + } + } +} + + + +void mapLowResEnergyVal( + Int32 currVal, + Int32 *prevData, + Int32 offset, + Int32 index, + Int32 res) +{ + Int32 tmp; + + if (res == LO) + { + if (offset >= 0) + { + if (index < offset) + { + prevData[index] = currVal; + } + else + { + tmp = (index << 1) - offset; + prevData[tmp ] = currVal; + prevData[tmp +1 ] = currVal; + } + } + else + { + offset = -offset; + if (index < offset) + { + tmp = (index << 1) + index; + prevData[tmp ] = currVal; + prevData[tmp + 1] = currVal; + prevData[tmp + 2] = currVal; + } + else + { + tmp = (index << 1) + offset; + prevData[tmp ] = currVal; + prevData[tmp + 1] = currVal; + } + } + } + else + { + prevData[index] = currVal; + } +} + + +Int32 indexLow2High(Int32 offset, + Int32 index, + Int32 res) +{ + if (res == LO) + { + if (offset >= 0) + { + if (index < offset) + { + return(index); + } + else + { + return((index << 1) - offset); + } + } + else + { + offset = -offset; + if (index < offset) + { + return((index << 1) + index); + } + else + { + return((index << 1) + offset); + } + } + } + else + { + return(index); + } +} + +#endif + |