Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 107 insertions, 0 deletions

diff --git a/libSBRdec/src/env_calc.h b/libSBRdec/src/env_calc.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  Envelope calculation prototypes $Revision: 36841 $
+*/
+#ifndef __ENV_CALC_H
+#define __ENV_CALC_H
+
+#include "sbrdecoder.h"
+#include "env_extr.h"  /* for HANDLE_SBR_HEADER_DATA */
+#include "sbr_scale.h"
+
+
+typedef struct
+{
+  FIXP_DBL  filtBuffer[MAX_FREQ_COEFFS];          /*!< previous gains (required for smoothing) */
+  FIXP_DBL  filtBufferNoise[MAX_FREQ_COEFFS];     /*!< previous noise levels (required for smoothing) */
+  SCHAR     filtBuffer_e[MAX_FREQ_COEFFS];        /*!< Exponents of previous gains */
+  SCHAR     filtBufferNoise_e;                    /*!< Common exponent of previous noise levels */
+
+  int startUp;               /*!< flag to signal initial conditions in buffers */
+  int phaseIndex;            /*!< Index for randomPase array */
+  int prevTranEnv;           /*!< The transient envelope of the previous frame. */
+
+  int harmFlagsPrev[(MAX_FREQ_COEFFS+15)/16];
+  /*!< Words with 16 flags each indicating where a sine was added in the previous frame.*/
+  UCHAR harmIndex;            /*!< Current phase of synthetic sine */
+
+}
+SBR_CALCULATE_ENVELOPE;
+
+typedef SBR_CALCULATE_ENVELOPE *HANDLE_SBR_CALCULATE_ENVELOPE;
+
+
+
+void
+calculateSbrEnvelope (QMF_SCALE_FACTOR  *sbrScaleFactor,
+                      HANDLE_SBR_CALCULATE_ENVELOPE h_sbr_cal_env,
+                      HANDLE_SBR_HEADER_DATA hHeaderData,
+                      HANDLE_SBR_FRAME_DATA hFrameData,
+                      FIXP_DBL **analysBufferReal,
+                      FIXP_DBL **analysBufferImag,                 /*!< Imag part of subband samples to be processed */
+                      const int useLP,
+                      FIXP_DBL *degreeAlias,                       /*!< Estimated aliasing for each QMF channel */
+                      const UINT flags,
+                      const int frameErrorFlag
+                      );
+
+SBR_ERROR
+createSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope,
+                       HANDLE_SBR_HEADER_DATA hHeaderData,
+                       const int chan,
+                       const UINT flags);
+
+int
+deleteSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope);
+
+void
+resetSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hCalEnv);
+
+SBR_ERROR
+ResetLimiterBands ( UCHAR *limiterBandTable,
+                    UCHAR *noLimiterBands,
+                    UCHAR *freqBandTable,
+                    int noFreqBands,
+                    const PATCH_PARAM *patchParam,
+                    int noPatches,
+                    int limiterBands);
+
+void rescaleSubbandSamples( FIXP_DBL ** re,
+                            FIXP_DBL ** im,
+                            int lowSubband, int noSubbands,
+                            int start_pos,  int next_pos,
+                            int shift);
+
+FIXP_DBL maxSubbandSample( FIXP_DBL ** analysBufferReal_m,
+                           FIXP_DBL ** analysBufferImag_m,
+                           int lowSubband,
+                           int highSubband,
+                           int start_pos,
+                           int stop_pos);
+
+#endif // __ENV_CALC_H