Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 184 insertions, 0 deletions

diff --git a/libSBRdec/src/lpp_tran.h b/libSBRdec/src/lpp_tran.h
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+/****************************************************************************
+
+                     (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.
+
+
+   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.
+
+ $Id$
+
+*******************************************************************************/
+/*!
+  \file
+  \brief  Low Power Profile Transposer, $Revision: 36841 $
+*/
+
+#ifndef _LPP_TRANS_H
+#define _LPP_TRANS_H
+
+#include "sbrdecoder.h"
+#include "qmf.h"
+
+/*
+  Common
+*/
+#define QMF_OUT_SCALE            8
+
+/*
+  Env-Adjust
+*/
+#define MAX_NOISE_ENVELOPES      2
+#define MAX_NOISE_COEFFS         5
+#define MAX_NUM_NOISE_VALUES     (MAX_NOISE_ENVELOPES * MAX_NOISE_COEFFS)
+#define MAX_NUM_LIMITERS         12
+
+/* Set MAX_ENVELOPES to the largest value of all supported BSFORMATs
+   by overriding MAX_ENVELOPES in the correct order: */
+#define MAX_ENVELOPES_HEAAC      5
+#define MAX_ENVELOPES            MAX_ENVELOPES_HEAAC
+
+#define MAX_FREQ_COEFFS          48
+#define MAX_FREQ_COEFFS_FS44100  35
+#define MAX_FREQ_COEFFS_FS48000  32
+
+
+#define MAX_NUM_ENVELOPE_VALUES  (MAX_ENVELOPES * MAX_FREQ_COEFFS)
+
+#define MAX_GAIN_EXP             34
+/* Maximum gain will be sqrt(0.5 * 2^MAX_GAIN_EXP)
+   example: 34=99dB   */
+#define MAX_GAIN_CONCEAL_EXP     1
+/* Maximum gain will be sqrt(0.5 * 2^MAX_GAIN_CONCEAL_EXP) in concealment case (0dB) */
+
+/*
+  LPP Transposer
+*/
+#define LPC_ORDER                2
+
+#define MAX_INVF_BANDS           MAX_NOISE_COEFFS
+
+#define MAX_NUM_PATCHES          6
+#define SHIFT_START_SB           1              /*!< lowest subband of source range */
+
+typedef enum
+{
+  INVF_OFF = 0,
+  INVF_LOW_LEVEL,
+  INVF_MID_LEVEL,
+  INVF_HIGH_LEVEL,
+  INVF_SWITCHED /* not a real choice but used here to control behaviour */
+}
+INVF_MODE;
+
+
+/** parameter set for one single patch */
+typedef struct {
+  UCHAR  sourceStartBand;   /*!< first band in lowbands where to take the samples from */
+  UCHAR  sourceStopBand;    /*!< first band in lowbands which is not included in the patch anymore */
+  UCHAR  guardStartBand;    /*!< first band in highbands to be filled with zeros in order to
+                                         reduce interferences between patches */
+  UCHAR  targetStartBand;   /*!< first band in highbands to be filled with whitened lowband signal */
+  UCHAR  targetBandOffs;    /*!< difference between 'startTargetBand' and 'startSourceBand' */
+  UCHAR  numBandsInPatch;   /*!< number of consecutive bands in this one patch */
+} PATCH_PARAM;
+
+
+/** whitening factors for different levels of whitening
+    need to be initialized corresponding to crossover frequency */
+typedef struct {
+  FIXP_DBL  off;                       /*!< bw factor for signal OFF */
+  FIXP_DBL  transitionLevel;
+  FIXP_DBL  lowLevel;                  /*!< bw factor for signal LOW_LEVEL */
+  FIXP_DBL  midLevel;                  /*!< bw factor for signal MID_LEVEL */
+  FIXP_DBL  highLevel;                 /*!< bw factor for signal HIGH_LEVEL */
+} WHITENING_FACTORS;
+
+
+/*! The transposer settings are calculated on a header reset and are shared by both channels. */
+typedef struct {
+  UCHAR  nCols;                       /*!< number subsamples of a codec frame */
+  UCHAR  noOfPatches;                 /*!< number of patches */
+  UCHAR  lbStartPatching;             /*!< first band of lowbands that will be patched */
+  UCHAR  lbStopPatching;              /*!< first band that won't be patched anymore*/
+  UCHAR  bwBorders[MAX_NUM_NOISE_VALUES]; /*!< spectral bands with different inverse filtering levels */
+
+  PATCH_PARAM    patchParam[MAX_NUM_PATCHES]; /*!< new parameter set for patching */
+  WHITENING_FACTORS whFactors;                /*!< the pole moving factors for certain whitening levels as indicated
+                                                   in the bitstream depending on the crossover frequency */
+  UCHAR  overlap;                             /*!< Overlap size */
+} TRANSPOSER_SETTINGS;
+
+
+typedef struct
+{
+  TRANSPOSER_SETTINGS *pSettings;                /*!< Common settings for both channels */
+  FIXP_DBL  bwVectorOld[MAX_NUM_PATCHES];        /*!< pole moving factors of past frame */
+  FIXP_DBL  lpcFilterStatesReal[LPC_ORDER][(32)];     /*!< pointer array to save filter states */
+  FIXP_DBL  lpcFilterStatesImag[LPC_ORDER][(32)];     /*!< pointer array to save filter states */
+}
+SBR_LPP_TRANS;
+
+typedef SBR_LPP_TRANS *HANDLE_SBR_LPP_TRANS;
+
+
+void lppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans,
+                    QMF_SCALE_FACTOR  *sbrScaleFactor,
+                    FIXP_DBL **qmfBufferReal,
+
+                    FIXP_DBL *degreeAlias,
+                    FIXP_DBL **qmfBufferImag,
+                    const int useLP,
+                    const int timeStep,
+                    const int firstSlotOffset,
+                    const int lastSlotOffset,
+                    const int nInvfBands,
+                    INVF_MODE *sbr_invf_mode,
+                    INVF_MODE *sbr_invf_mode_prev
+                    );
+
+
+SBR_ERROR
+createLppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans,
+                     TRANSPOSER_SETTINGS *pSettings,
+                     const int  highBandStartSb,
+                     UCHAR *v_k_master,
+                     const int  numMaster,
+                     const int  usb,
+                     const int  timeSlots,
+                     const int  nCols,
+                     UCHAR *noiseBandTable,
+                     const int  noNoiseBands,
+                     UINT   fs,
+                     const int  chan,
+                     const int overlap);
+
+
+SBR_ERROR
+resetLppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans,
+                    UCHAR  highBandStartSb,
+                    UCHAR *v_k_master,
+                    UCHAR  numMaster,
+                    UCHAR *noiseBandTable,
+                    UCHAR  noNoiseBands,
+                    UCHAR  usb,
+                    UINT   fs);
+
+
+
+#endif /* _LPP_TRANS_H */
+