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-/*
-** FAAD - Freeware Advanced Audio Decoder
-** Copyright (C) 2002 M. Bakker
-**
-** This program is free software; you can redistribute it and/or modify
-** it under the terms of the GNU General Public License as published by
-** the Free Software Foundation; either version 2 of the License, or
-** (at your option) any later version.
-**
-** This program is distributed in the hope that it will be useful,
-** but WITHOUT ANY WARRANTY; without even the implied warranty of
-** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-** GNU General Public License for more details.
-**
-** You should have received a copy of the GNU General Public License
-** along with this program; if not, write to the Free Software
-** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-**
-** $Id: sbr_dec.c,v 1.1 2002/07/14 23:43:01 miguelfreitas Exp $
-**/
-
-/*
- SBR Decoder overview:
-
- To achieve a synchronized output signal, the following steps have to be
- acknowledged in the decoder:
- - The bitstream parser divides the bitstream into two parts; the AAC
- core coder part and the SBR part.
- - The SBR bitstream part is fed to the bitstream de-multiplexer followed
- by de-quantization The raw data is Huffman decoded.
- - The AAC bitstream part is fed to the AAC core decoder, where the
- bitstream data of the current frame is decoded, yielding a time domain
- audio signal block of 1024 samples. The block length could easily be
- adapted to other sizes e.g. 960.
- - The core coder audio block is fed to the analysis QMF bank using a
- delay of 1312 samples.
- - The analysis QMF bank performs the filtering of the delayed core coder
- audio signal. The output from the filtering is stored in the matrix
- Xlow. The output from the analysis QMF bank is delayed tHFGen subband
- samples, before being fed to the synthesis QMF bank. To achieve
- synchronization tHFGen = 32, i.e. the value must equal the number of
- subband samples corresponding to one frame.
- - The HF generator calculates XHigh given the matrix XLow. The process
- is guided by the SBR data contained in the current frame.
- - The envelope adjuster calculates the matrix Y given the matrix XHigh
- and the SBR envelope data, extracted from the SBR bitstream. To
- achieve synchronization, tHFAdj has to be set to tHFAdj = 0, i.e. the
- envelope adjuster operates on data delayed tHFGen subband samples.
- - The synthesis QMF bank operates on the delayed output from the analysis
- QMF bank and the output from the envelope adjuster.
- */
-
-#include "common.h"
-
-#ifdef SBR
-
-#include "sbr_syntax.h"
-#include "sbr_qmf.h"
-
-#endif