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+/***************************** MPEG-4 AAC Decoder **************************
+
+ (C) Copyright Fraunhofer IIS (2004)
+ All Rights Reserved
+
+ Please be advised that this software and/or program delivery is
+ Confidential Information of Fraunhofer and subject to and covered by the
+
+ Fraunhofer IIS Software Evaluation Agreement
+ between Google Inc. and Fraunhofer
+ effective and in full force since March 1, 2012.
+
+ You may use this software and/or program only under the terms and
+ conditions described in the above mentioned Fraunhofer IIS Software
+ Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+ $Id$
+ Author(s): Josef Hoepfl
+ Description: long/short-block decoding
+
+ This software and/or program is protected by copyright law and international
+ treaties. Any reproduction or distribution of this software and/or program,
+ or any portion of it, may result in severe civil and criminal penalties, and
+ will be prosecuted to the maximum extent possible under law.
+
+******************************************************************************/
+
+#ifndef BLOCK_H
+#define BLOCK_H
+
+#include "common_fix.h"
+
+#include "channelinfo.h"
+#include "FDK_bitstream.h"
+
+/* PNS (of block) */
+void CPns_Read (CPnsData *pPnsData,
+ HANDLE_FDK_BITSTREAM bs,
+ const CodeBookDescription *hcb,
+ SHORT *pScaleFactor,
+ UCHAR global_gain,
+ int band,
+ int group);
+
+
+void CPns_Apply (const CPnsData *pPnsData,
+ const CIcsInfo *pIcsInfo,
+ SPECTRAL_PTR pSpectrum,
+ const SHORT *pSpecScale,
+ const SHORT *pScaleFactor,
+ const SamplingRateInfo *pSamplingRateInfo,
+ const INT granuleLength,
+ const int channel);
+
+
+
+/* TNS (of block) */
+/*!
+ \brief Read tns data-present flag from bitstream
+
+ The function reads the data-present flag for tns from
+ the bitstream.
+
+ \return none
+*/
+void CTns_ReadDataPresentFlag(HANDLE_FDK_BITSTREAM bs,
+ CTnsData *pTnsData);
+
+void CTns_ReadDataPresentUsac(
+ HANDLE_FDK_BITSTREAM hBs,
+ CTnsData *pTnsData0,
+ CTnsData *pTnsData1,
+ const CIcsInfo *pIcsInfo,
+ const UINT flags,
+ const int fCommonWindow
+ );
+
+AAC_DECODER_ERROR CTns_Read(HANDLE_FDK_BITSTREAM bs,
+ CTnsData *pTnsData,
+ const CIcsInfo *pIcsInfo,
+ const UINT flags);
+
+void CTns_Apply ( CTnsData *RESTRICT pTnsData, /*!< pointer to aac decoder info */
+ const CIcsInfo *pIcsInfo,
+ SPECTRAL_PTR pSpectralCoefficient,
+ const SamplingRateInfo *pSamplingRateInfo,
+ const INT granuleLength);
+
+/* Block */
+
+LONG CBlock_GetEscape(HANDLE_FDK_BITSTREAM bs, const LONG q);
+
+/**
+ * \brief Read scale factor data. See chapter 4.6.2.3.2 of ISO/IEC 14496-3.
+ * The SF_OFFSET = 100 value referenced in chapter 4.6.2.3.3 is already substracted
+ * from the scale factor values. Also includes PNS data reading.
+ * \param bs bit stream handle data source
+ * \param pAacDecoderChannelInfo channel context info were decoded data is stored into.
+ * \param flags the decoder flags.
+ */
+AAC_DECODER_ERROR CBlock_ReadScaleFactorData(
+ CAacDecoderChannelInfo *pAacDecoderChannelInfo,
+ HANDLE_FDK_BITSTREAM bs,
+ const UINT flags
+ );
+
+/**
+ * \brief Read Huffman encoded spectral data.
+ * \param pAacDecoderChannelInfo channel context info.
+ * \param pSamplingRateInfo sampling rate info (sfb offsets).
+ * \param flags syntax flags.
+ */
+AAC_DECODER_ERROR CBlock_ReadSpectralData(HANDLE_FDK_BITSTREAM bs,
+ CAacDecoderChannelInfo *pAacDecoderChannelInfo,
+ const SamplingRateInfo *pSamplingRateInfo,
+ const UINT flags);
+
+
+AAC_DECODER_ERROR CBlock_ReadSectionData(HANDLE_FDK_BITSTREAM bs,
+ CAacDecoderChannelInfo *pAacDecoderChannelInfo,
+ const SamplingRateInfo *pSamplingRateInfo,
+ const UINT flags);
+
+/**
+ * \brief find a common exponent (shift factor) for all sfb in each Spectral window, and store them into
+ * CAacDecoderChannelInfo::specScale.
+ * \param pAacDecoderChannelInfo channel context info.
+ * \param pSamplingRateInfo sampling rate info (sfb offsets).
+ */
+void CBlock_ScaleSpectralData(CAacDecoderChannelInfo *pAacDecoderChannelInfo, SamplingRateInfo *pSamplingRateInfo);
+
+/**
+ * \brief Apply TNS and PNS tools.
+ */
+void ApplyTools ( CAacDecoderChannelInfo *pAacDecoderChannelInfo[],
+ const SamplingRateInfo *pSamplingRateInfo,
+ const UINT flags,
+ const int channel );
+
+/**
+ * \brief Transform MDCT spectral data into time domain
+ */
+void CBlock_FrequencyToTime(CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo,
+ CAacDecoderChannelInfo *pAacDecoderChannelInfo,
+ INT_PCM outSamples[],
+ const SHORT frameLen,
+ const int stride,
+ const int frameOk,
+ FIXP_DBL *pWorkBuffer1);
+
+/**
+ * \brief Transform double lapped MDCT (AAC-ELD) spectral data into time domain.
+ */
+void CBlock_FrequencyToTimeLowDelay(CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo,
+ CAacDecoderChannelInfo *pAacDecoderChannelInfo,
+ INT_PCM outSamples[],
+ const short frameLen,
+ const char stride);
+
+AAC_DECODER_ERROR CBlock_InverseQuantizeSpectralData(CAacDecoderChannelInfo *pAacDecoderChannelInfo, SamplingRateInfo *pSamplingRateInfo);
+
+/**
+ * \brief Calculate 2^(lsb/4) * value^(4/3)
+ * \param pValue pointer to quantized value. The inverse quantized result is stored back here.
+ * \param lsb 2 LSBs of the scale factor (scaleFactor % 4) applied as power 2 factor to the
+ * resulting inverse quantized value.
+ * \return the exponent of the result (mantissa) stored into *pValue.
+ */
+FDK_INLINE
+int EvaluatePower43 ( FIXP_DBL *pValue,
+ UINT lsb )
+{
+ FIXP_DBL value;
+ UINT freeBits;
+ UINT exponent;
+
+ value = *pValue;
+ freeBits = fNormz (value) ;
+ exponent = DFRACT_BITS - freeBits ;
+ FDK_ASSERT (exponent < 14);
+
+ UINT x = (((int)value << freeBits) >> 19) ;
+ UINT tableIndex = (x & 0x0FFF) >> 4 ;
+ FIXP_DBL invQVal ;
+
+ x = x & 0x0F;
+
+ UINT r0=(LONG)InverseQuantTable [tableIndex+0];
+ UINT r1=(LONG)InverseQuantTable [tableIndex+1];
+ USHORT nx=16-x;
+ UINT temp=(r0)*nx+(r1)*x;
+ invQVal = (FIXP_DBL)temp;
+
+ FDK_ASSERT(lsb < 4);
+ *pValue = fMultDiv2 (invQVal, MantissaTable [lsb][exponent]) ;
+
+ /* + 1 compensates fMultDiv2(). */
+ return ExponentTable [lsb][exponent] + 1;
+}
+
+/**
+ * \brief determine the required shift scale for the given quantized value and scale (factor % 4) value.
+ */
+FDK_INLINE int GetScaleFromValue (FIXP_DBL value, unsigned int lsb)
+{
+ if (value!=(FIXP_DBL)0)
+ {
+ int scale = EvaluatePower43 (&value, lsb) ;
+ return CntLeadingZeros (value) - scale - 2 ;
+ }
+ else
+ return 0; /* Return zero, because its useless to scale a zero value, saves workload and avoids scaling overshifts. */
+}
+
+
+//#ifdef AACDEC_HUFFMANDECODER_ENABLE
+
+/*!
+ \brief Read huffman codeword
+
+ The function reads the huffman codeword from the bitstream and
+ returns the index value.
+
+ \return index value
+*/
+inline int CBlock_DecodeHuffmanWord( HANDLE_FDK_BITSTREAM bs, /*!< pointer to bitstream */
+ const CodeBookDescription *hcb ) /*!< pointer to codebook description */
+{
+ UINT val;
+ UINT index = 0;
+ const USHORT (*CodeBook) [HuffmanEntries] = hcb->CodeBook;
+
+ while (1)
+ {
+ val = CodeBook[index][FDKreadBits(bs,HuffmanBits)]; /* Expensive memory access */
+
+ if ((val & 1) == 0)
+ {
+ index = val>>2;
+ continue;
+ }
+ else
+ {
+ if (val & 2)
+ {
+ FDKpushBackCache(bs,1);
+ }
+
+ val >>= 2;
+ break;
+ }
+ }
+
+ return val;
+}
+
+//#endif /* AACDEC_HUFFMANDECODER_ENABLE */
+
+#endif /* #ifndef BLOCK_H */
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