Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 294 insertions, 0 deletions

diff --git a/libSBRdec/src/psdec.h b/libSBRdec/src/psdec.h
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+/****************************************************************************
+
+                     (C) Copyright Fraunhofer IIS (2005)
+                               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  Sbr decoder $Revision: 36841 $
+*/
+#ifndef __PSDEC_H
+#define __PSDEC_H
+
+#include "sbrdecoder.h"
+
+
+
+/* This PS decoder implements the baseline version. So it always uses the     */
+/* hybrid filter structure for 20 stereo bands and does not implemet IPD/OPD  */
+/* synthesis. The baseline version has to support the complete PS bitstream   */
+/* syntax. But IPD/OPD data is ignored and set to 0. If 34 stereo band config */
+/* is used in the bitstream for IIS/ICC the decoded parameters are mapped to  */
+/* 20 stereo bands.                                                           */
+
+
+#include "FDK_bitstream.h"
+
+#include "psdec_hybrid.h"
+
+#define SCAL_HEADROOM                     ( 2 )
+
+#define PS_EXTENSION_SIZE_BITS            ( 4 )
+#define PS_EXTENSION_ESC_COUNT_BITS       ( 8 )
+
+#define NO_QMF_CHANNELS                   ( 64 )
+#define MAX_NUM_COL                       ( 32 )
+
+
+  #define NO_QMF_BANDS_HYBRID20           ( 3  )
+  #define NO_SUB_QMF_CHANNELS             ( 12 )
+
+  #define NRG_INT_COEFF                   ( 0.75f )
+  #define INT_FILTER_COEFF                (FL2FXCONST_DBL( 1.0f - NRG_INT_COEFF ))
+  #define PEAK_DECAY_FACTOR               (FL2FXCONST_DBL( 0.765928338364649f ))
+  #define TRANSIENT_IMPACT_FACTOR         (FL2FXCONST_DBL( 2.0 / 3.0 ))
+
+  #define NO_SERIAL_ALLPASS_LINKS         ( 3 )
+  #define MAX_NO_PS_ENV                   ( 4 + 1 )   /* +1 needed for VAR_BORDER */
+
+  #define MAX_DELAY_BUFFER_SIZE           ( 14 )
+  #define NO_DELAY_BUFFER_BANDS           ( 35 )
+
+  #define NO_HI_RES_BINS                  ( 34 )
+  #define NO_MID_RES_BINS                 ( 20 )
+  #define NO_LOW_RES_BINS                 ( 10 )
+
+  #define FIRST_DELAY_SB                  ( 23 )
+  #define NO_SAMPLE_DELAY_ALLPASS         ( 2 )
+  #define NO_DELAY_LENGTH_VECTORS         ( 12 )     /* d(m): d(0)=3 + d(1)=4 + d(2)=5 */
+
+  #define NO_HI_RES_IID_BINS              ( NO_HI_RES_BINS )
+  #define NO_HI_RES_ICC_BINS              ( NO_HI_RES_BINS )
+
+  #define NO_MID_RES_IID_BINS             ( NO_MID_RES_BINS )
+  #define NO_MID_RES_ICC_BINS             ( NO_MID_RES_BINS )
+
+  #define NO_LOW_RES_IID_BINS             ( NO_LOW_RES_BINS )
+  #define NO_LOW_RES_ICC_BINS             ( NO_LOW_RES_BINS )
+
+  #define SUBQMF_GROUPS                   ( 10 )
+  #define QMF_GROUPS                      ( 12 )
+
+  #define SUBQMF_GROUPS_HI_RES            ( 32 )
+  #define QMF_GROUPS_HI_RES               ( 18 )
+
+  #define NO_IID_GROUPS                   ( SUBQMF_GROUPS + QMF_GROUPS )
+  #define NO_IID_GROUPS_HI_RES            ( SUBQMF_GROUPS_HI_RES + QMF_GROUPS_HI_RES )
+
+  #define NO_IID_STEPS                    ( 7 )  /* 1 .. + 7 */
+  #define NO_IID_STEPS_FINE               ( 15 ) /* 1 .. +15 */
+  #define NO_ICC_STEPS                    ( 8 )  /* 0 .. + 7 */
+
+  #define NO_IID_LEVELS                   ( 2 * NO_IID_STEPS + 1 )      /* - 7 ..  + 7 */
+  #define NO_IID_LEVELS_FINE              ( 2 * NO_IID_STEPS_FINE + 1 ) /* -15 ..  +15 */
+  #define NO_ICC_LEVELS                   ( NO_ICC_STEPS )              /*   0 ..  + 7 */
+
+  #define FIXP_SQRT05                     ((FIXP_DBL)0x5a827980) /* 1/SQRT2 */
+
+  struct PS_DEC_COEFFICIENTS {
+
+    FIXP_DBL H11r[NO_IID_GROUPS];                       /*!< coefficients of the sub-subband groups                               */
+    FIXP_DBL H12r[NO_IID_GROUPS];                       /*!< coefficients of the sub-subband groups                               */
+    FIXP_DBL H21r[NO_IID_GROUPS];                       /*!< coefficients of the sub-subband groups                               */
+    FIXP_DBL H22r[NO_IID_GROUPS];                       /*!< coefficients of the sub-subband groups                               */
+
+    FIXP_DBL DeltaH11r[NO_IID_GROUPS];                  /*!< coefficients of the sub-subband groups                               */
+    FIXP_DBL DeltaH12r[NO_IID_GROUPS];                  /*!< coefficients of the sub-subband groups                               */
+    FIXP_DBL DeltaH21r[NO_IID_GROUPS];                  /*!< coefficients of the sub-subband groups                               */
+    FIXP_DBL DeltaH22r[NO_IID_GROUPS];                  /*!< coefficients of the sub-subband groups                               */
+
+    SCHAR aaIidIndexMapped[MAX_NO_PS_ENV][NO_HI_RES_IID_BINS];       /*!< The mapped IID index for all envelopes and all IID bins */
+    SCHAR aaIccIndexMapped[MAX_NO_PS_ENV][NO_HI_RES_ICC_BINS];       /*!< The mapped ICC index for all envelopes and all ICC bins */
+
+  };
+
+
+
+
+typedef enum {
+  ppt_none = 0,
+  ppt_mpeg = 1,
+  ppt_drm  = 2
+} PS_PAYLOAD_TYPE;
+
+
+typedef struct {
+  UCHAR bPsHeaderValid;                                      /*!< set if new header is available from bitstream                 */
+
+  UCHAR bEnableIid;                                          /*!< One bit denoting the presence of IID parameters               */
+  UCHAR bEnableIcc;                                          /*!< One bit denoting the presence of ICC parameters               */
+  UCHAR bEnableExt;                                          /*!< The PS extension layer is enabled using the enable_ext bit.
+                                                                  If it is set to %1 the IPD and OPD parameters are sent.
+                                                                  If it is disabled, i.e. %0, the extension layer is skipped.   */
+
+  UCHAR modeIid;                                             /*!< The configuration of IID parameters (number of bands and
+                                                                  quantisation grid, iid_quant) is determined by iid_mode.      */
+  UCHAR modeIcc;                                             /*!< The configuration of Inter-channel Coherence parameters
+                                                                  (number of bands and quantisation grid) is determined by
+                                                                  icc_mode.                                                     */
+
+  UCHAR freqResIid;                                          /*!< 0=low, 1=mid or 2=high frequency resolution for iid           */
+  UCHAR freqResIcc;                                          /*!< 0=low, 1=mid or 2=high frequency resolution for icc           */
+
+  UCHAR bFineIidQ;                                           /*!< Use fine Iid quantisation.                                    */
+
+  UCHAR bFrameClass;                                         /*!< The frame_class bit determines whether the parameter
+                                                                  positions of the current frame are uniformly spaced
+                                                                  accross the frame or they are defined using the positions
+                                                                  described by border_position.                                 */
+
+  UCHAR noEnv;                                               /*!< The number of envelopes per frame                             */
+  UCHAR aEnvStartStop[MAX_NO_PS_ENV+1];                      /*!< In case of variable parameter spacing the parameter
+                                                                  positions are determined by border_position                   */
+
+  SCHAR abIidDtFlag[MAX_NO_PS_ENV];                                /*!< Deltacoding time/freq flag for IID, 0 => freq           */
+  SCHAR abIccDtFlag[MAX_NO_PS_ENV];                                /*!< Deltacoding time/freq flag for ICC, 0 => freq           */
+
+  SCHAR aaIidIndex[MAX_NO_PS_ENV][NO_HI_RES_IID_BINS];             /*!< The IID index for all envelopes and all IID bins        */
+  SCHAR aaIccIndex[MAX_NO_PS_ENV][NO_HI_RES_ICC_BINS];             /*!< The ICC index for all envelopes and all ICC bins        */
+
+} MPEG_PS_BS_DATA;
+
+
+
+struct PS_DEC {
+
+  SCHAR noSubSamples;
+  SCHAR noChannels;
+
+  SCHAR procFrameBased;                                      /*!< Helper to detected switching from frame based to slot based
+                                                                  processing                                                    */
+
+  PS_PAYLOAD_TYPE bPsDataAvail[(1)+1];   /*!< set if new data available from bitstream                      */
+  UCHAR psDecodedPrv;                                        /*!< set if PS has been processed in the last frame                */
+
+  /* helpers for frame delay line */
+  UCHAR bsLastSlot;                                          /*!< Index of last read slot.                                      */
+  UCHAR bsReadSlot;                                          /*!< Index of current read slot for additional delay.              */
+  UCHAR processSlot;                                         /*!< Index of current slot for processing (need for add. delay).   */
+
+
+  INT  rescal;
+  INT  sf_IntBuffer;
+
+  union {  /* Bitstream data */
+    MPEG_PS_BS_DATA  mpeg;                                   /*!< Struct containing all MPEG specific PS data from bitstream.   */
+  } bsData[(1)+1];
+
+  shouldBeUnion {  /* Static data */
+    struct {
+      SCHAR aIidPrevFrameIndex[NO_HI_RES_IID_BINS];          /*!< The IID index for previous frame                              */
+      SCHAR aIccPrevFrameIndex[NO_HI_RES_ICC_BINS];          /*!< The ICC index for previous frame                              */
+
+      UCHAR delayBufIndex;                                         /*!< Pointer to where the latest sample is in buffer         */
+      UCHAR noSampleDelay;                                         /*!< How many QMF samples delay is used.                     */
+      UCHAR lastUsb;                                               /*!< uppermost WMF delay band of last frame                  */
+
+      UCHAR aDelayRBufIndexSer[NO_SERIAL_ALLPASS_LINKS];             /*!< Delay buffer for reverb filter                        */
+      UCHAR aDelayBufIndexDelayQmf[NO_QMF_CHANNELS-FIRST_DELAY_SB];  /*!< Delay buffer for ICC group 20 & 21                    */
+
+      SCHAR scaleFactorPsDelayBuffer;                                /*!< Scale factor for ps delay buffer                      */
+
+      /* hybrid filter bank delay lines */
+      FIXP_DBL aaQmfDelayBufReal[(NO_QMF_CHANNELS-FIRST_DELAY_SB) + (MAX_DELAY_BUFFER_SIZE-1)*(NO_DELAY_BUFFER_BANDS-FIRST_DELAY_SB)];
+      FIXP_DBL aaQmfDelayBufImag[(NO_QMF_CHANNELS-FIRST_DELAY_SB) + (MAX_DELAY_BUFFER_SIZE-1)*(NO_DELAY_BUFFER_BANDS-FIRST_DELAY_SB)];
+
+      FIXP_DBL *pAaRealDelayBufferQmf[MAX_DELAY_BUFFER_SIZE];          /*!< Real part delay buffer                                  */
+      FIXP_DBL *pAaImagDelayBufferQmf[MAX_DELAY_BUFFER_SIZE];          /*!< Imaginary part delay buffer                             */
+
+      FIXP_DBL aaRealDelayBufferQmf[NO_SAMPLE_DELAY_ALLPASS][FIRST_DELAY_SB]; /*!< Real part delay buffer     */
+      FIXP_DBL aaImagDelayBufferQmf[NO_SAMPLE_DELAY_ALLPASS][FIRST_DELAY_SB]; /*!< Imaginary part delay buffer*/
+
+      FIXP_DBL aaRealDelayBufferSubQmf[NO_SAMPLE_DELAY_ALLPASS][NO_SUB_QMF_CHANNELS];          /*!< Real part delay buffer          */
+      FIXP_DBL aaImagDelayBufferSubQmf[NO_SAMPLE_DELAY_ALLPASS][NO_SUB_QMF_CHANNELS];          /*!< Imaginary part delay buffer     */
+
+      FIXP_DBL aaaRealDelayRBufferSerQmf[FIRST_DELAY_SB][NO_DELAY_LENGTH_VECTORS];             /*!< Real part delay buffer          */
+      FIXP_DBL aaaImagDelayRBufferSerQmf[FIRST_DELAY_SB][NO_DELAY_LENGTH_VECTORS];             /*!< Imaginary part delay buffer     */
+
+      FIXP_DBL aaaRealDelayRBufferSerSubQmf[NO_SUB_QMF_CHANNELS][NO_DELAY_LENGTH_VECTORS];     /*!< Real part delay buffer          */
+      FIXP_DBL aaaImagDelayRBufferSerSubQmf[NO_SUB_QMF_CHANNELS][NO_DELAY_LENGTH_VECTORS];     /*!< Imaginary part delay buffer     */
+
+      HYBRID hybrid;                                      /*!< hybrid filter bank struct 1 or 2.                          */
+
+      FIXP_DBL aPrevNrgBin[NO_MID_RES_BINS];              /*!< energy of previous frame                                             */
+      FIXP_DBL aPrevPeakDiffBin[NO_MID_RES_BINS];         /*!< peak difference of previous frame                                    */
+      FIXP_DBL aPeakDecayFastBin[NO_MID_RES_BINS];        /*!< Saved max. peak decay value per bin                                  */
+      SCHAR aPowerPrevScal[NO_MID_RES_BINS];              /*!< Last power value (each bin) of previous frame                        */
+
+      FIXP_DBL h11rPrev[NO_IID_GROUPS];                   /*!< previous calculated h(xy) coefficients                               */
+      FIXP_DBL h12rPrev[NO_IID_GROUPS];                   /*!< previous calculated h(xy) coefficients                               */
+      FIXP_DBL h21rPrev[NO_IID_GROUPS];                   /*!< previous calculated h(xy) coefficients                               */
+      FIXP_DBL h22rPrev[NO_IID_GROUPS];                   /*!< previous calculated h(xy) coefficients                               */
+
+      PS_DEC_COEFFICIENTS  coef;                         /*!< temporal coefficients (reusable scratch memory)                 */
+
+    } mpeg;
+
+  } specificTo;
+
+
+};
+
+typedef struct PS_DEC *HANDLE_PS_DEC;
+
+
+int CreatePsDec(HANDLE_PS_DEC *h_PS_DEC, int aacSamplesPerFrame);
+
+int DeletePsDec(HANDLE_PS_DEC *h_PS_DEC);
+
+void
+scalFilterBankValues( HANDLE_PS_DEC   h_ps_d,                        /* parametric stereo decoder handle     */
+                      FIXP_DBL      **fixpQmfReal,                   /* qmf filterbank values                */
+                      FIXP_DBL      **fixpQmfImag,                   /* qmf filterbank values                */
+                      int             lsb,                           /* sbr start subband                    */
+                      int             scaleFactorLowBandSplitLow,
+                      int             scaleFactorLowBandSplitHigh,
+                      SCHAR          *scaleFactorLowBand_lb,
+                      SCHAR          *scaleFactorLowBand_hb,
+                      int             scaleFactorHighBands,
+                      INT            *scaleFactorHighBand,
+                      INT             noCols);
+
+void
+rescalFilterBankValues( HANDLE_PS_DEC   h_ps_d,                      /* parametric stereo decoder handle     */
+                        FIXP_DBL      **QmfBufferReal,               /* qmf filterbank values                */
+                        FIXP_DBL      **QmfBufferImag,               /* qmf filterbank values                */
+                        int             lsb,                         /* sbr start subband                    */
+                        INT             noCols);
+
+
+void
+initSlotBasedRotation( HANDLE_PS_DEC h_ps_d,
+                       int env,
+                       int usb);
+
+void
+ApplyPsSlot( HANDLE_PS_DEC h_ps_d,            /* parametric stereo decoder handle    */
+             FIXP_DBL **rIntBufferLeft,       /* real values of left qmf timeslot    */
+             FIXP_DBL **iIntBufferLeft,       /* imag values of left qmf timeslot    */
+             FIXP_DBL *rIntBufferRight,       /* real values of right qmf timeslot   */
+             FIXP_DBL *iIntBufferRight);      /* imag values of right qmf timeslot   */
+
+
+
+#endif  /* __PSDEC_H */