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Diffstat (limited to 'media/libstagefright/codecs/aacdec/ps_hybrid_synthesis.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/ps_hybrid_synthesis.cpp | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/ps_hybrid_synthesis.cpp b/media/libstagefright/codecs/aacdec/ps_hybrid_synthesis.cpp new file mode 100644 index 0000000..4fbd016 --- /dev/null +++ b/media/libstagefright/codecs/aacdec/ps_hybrid_synthesis.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: ps_hybrid_synthesis.c + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Who: Date: MM/DD/YYYY + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Hybrid synthesis + + _______ ________ + | | _______ | | + ->|Hybrid | LF ---- | |->| Hybrid |--> + | Anal. | | | | | Synth | QMF -> L + ------- o----------------------->| | -------- Synth +QMF | s_k(n) |Stereo |--------------> +Anal. -------------------------->| | + _______ | | | | ________ + | | HF --o | ----------- |Process| | | + ->| Delay | | ->| |-------->| |->| Hybrid |--> + ------- | |decorrelate| d_k(n) | | | Synth | QMF -> R + ---->| |-------->| | -------- Synth + ----------- |_______|--------------> + + +------------------------------------------------------------------------------ + 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 2003. + +------------------------------------------------------------------------------ + PSEUDO-CODE + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ + +#ifdef AAC_PLUS + +#ifdef PARAMETRICSTEREO + +#include "s_hybrid.h" +#include "ps_hybrid_synthesis.h" + +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ +#ifndef min +#define min(a, b) ((a) < (b) ? (a) : (b)) +#endif + +/*---------------------------------------------------------------------------- +; 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 ps_hybrid_synthesis(const Int32 *mHybridReal, + const Int32 *mHybridImag, + Int32 *mQmfReal, + Int32 *mQmfImag, + HYBRID *hHybrid) +{ + Int32 k; + Int32 band; + HYBRID_RES hybridRes; + + Int32 real; + Int32 imag; + Int32 *ptr_mQmfReal = mQmfReal; + Int32 *ptr_mQmfImag = mQmfImag; + const Int32 *ptr_mHybrid_Re = mHybridReal; + const Int32 *ptr_mHybrid_Im = mHybridImag; + + for (band = 0; band < hHybrid->nQmfBands; band++) + { + hybridRes = (HYBRID_RES)(min(hHybrid->pResolution[band], 6) - 2); + + real = *(ptr_mHybrid_Re++); + real += *(ptr_mHybrid_Re++); + imag = *(ptr_mHybrid_Im++); + imag += *(ptr_mHybrid_Im++); + + for (k = (hybridRes >> 1); k != 0; k--) /* hybridRes = { 2,4,6 } */ + { + real += *(ptr_mHybrid_Re++); + real += *(ptr_mHybrid_Re++); + imag += *(ptr_mHybrid_Im++); + imag += *(ptr_mHybrid_Im++); + } + + *(ptr_mQmfReal++) = real; + *(ptr_mQmfImag++) = imag; + } +} + +#endif + + +#endif + |