Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 188 insertions, 0 deletions

diff --git a/libFDK/include/qmf.h b/libFDK/include/qmf.h
new file mode 100644
index 0000000..89c1061
--- /dev/null
+++ b/libFDK/include/qmf.h
@@ -0,0 +1,188 @@
+/****************************************************************************
+
+                     (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   qmf.h
+  \brief  Complex qmf analysis/synthesis  $Revision: 36871 $
+  \author Markus Werner
+
+*/
+#ifndef __QMF_H
+#define __QMF_H
+
+
+
+#include "common_fix.h"
+#include "FDK_tools_rom.h"
+#include "dct.h"
+
+/*
+ * Filter coefficient type definition
+ */
+#ifdef QMF_DATA_16BIT
+#define FIXP_QMF FIXP_SGL
+#define FX_DBL2FX_QMF FX_DBL2FX_SGL
+#define FX_QMF2FX_DBL FX_SGL2FX_DBL
+#define QFRACT_BITS FRACT_BITS
+#else
+#define FIXP_QMF FIXP_DBL
+#define FX_DBL2FX_QMF
+#define FX_QMF2FX_DBL
+#define QFRACT_BITS DFRACT_BITS
+#endif
+
+/* ARM neon optimized QMF analysis filter requires 32 bit input.
+   Implemented for RVCT only, currently disabled. See src/arm/qmf_arm.cpp:45 */
+#define FIXP_QAS FIXP_PCM
+#define QAS_BITS SAMPLE_BITS
+
+#ifdef QMFSYN_STATES_16BIT
+#define FIXP_QSS FIXP_SGL
+#define QSS_BITS FRACT_BITS
+#else
+#define FIXP_QSS FIXP_DBL
+#define QSS_BITS DFRACT_BITS
+#endif
+
+/* Flags for QMF intialization */
+/* Low Power mode flag */
+#define QMF_FLAG_LP           1
+/* Filter is not symetric. This flag is set internally in the QMF initialization as required. */
+#define QMF_FLAG_NONSYMMETRIC 2
+/* Complex Low Delay Filter Bank (or std symmetric filter bank) */
+#define QMF_FLAG_CLDFB        4
+/* Flag indicating that the states should be kept. */
+#define QMF_FLAG_KEEP_STATES  8
+/* Complex Low Delay Filter Bank used in MPEG Surround Encoder */
+#define QMF_FLAG_MPSLDFB     16
+/* Complex Low Delay Filter Bank used in MPEG Surround Encoder allows a optimized calculation of the modulation in qmfForwardModulationHQ() */
+#define QMF_FLAG_MPSLDFB_OPTIMIZE_MODULATION  32
+
+
+typedef struct
+{
+  int lb_scale;        /*!< Scale of low band area                   */
+  int ov_lb_scale;     /*!< Scale of adjusted overlap low band area  */
+  int hb_scale;        /*!< Scale of high band area                  */
+  int ov_hb_scale;     /*!< Scale of adjusted overlap high band area */
+} QMF_SCALE_FACTOR;
+
+struct QMF_FILTER_BANK
+{
+  const FIXP_PFT *p_filter;     /*!< Pointer to filter coefficients */
+
+  void *FilterStates;           /*!< Pointer to buffer of filter states
+                                     FIXP_PCM in analyse and
+                                     FIXP_DBL in synthesis filter */
+  int FilterSize;               /*!< Size of prototype filter. */
+  const FIXP_QTW *t_cos;        /*!< Modulation tables. */
+  const FIXP_QTW *t_sin;
+  int filterScale;              /*!< filter scale */
+
+  int no_channels;              /*!< Total number of channels (subbands) */
+  int no_col;                   /*!< Number of time slots       */
+  int lsb;                      /*!< Top of low subbands */
+  int usb;                      /*!< Top of high subbands */
+
+  int outScalefactor;           /*!< Scale factor of output data (syn only) */
+  FIXP_DBL outGain;             /*!< Gain output data (syn only) (init with 0x80000000 to ignore) */
+
+  UINT flags;                   /*!< flags */
+  UCHAR p_stride;               /*!< Stride Factor of polyphase filters */
+
+};
+
+typedef struct QMF_FILTER_BANK *HANDLE_QMF_FILTER_BANK;
+
+void
+qmfAnalysisFiltering( HANDLE_QMF_FILTER_BANK anaQmf,  /*!< Handle of Qmf Analysis Bank   */
+                      FIXP_QMF **qmfReal,             /*!< Pointer to real subband slots */
+                      FIXP_QMF **qmfImag,             /*!< Pointer to imag subband slots */
+                      QMF_SCALE_FACTOR *scaleFactor,  /*!< Scale factors of QMF data     */
+                      const INT_PCM *timeIn,          /*!< Time signal */
+                      const int  stride,              /*!< Stride factor of audio data   */
+                      FIXP_QMF  *pWorkBuffer          /*!< pointer to temporal working buffer */
+                      );
+
+void
+qmfSynthesisFiltering( HANDLE_QMF_FILTER_BANK synQmf,       /*!< Handle of Qmf Synthesis Bank  */
+                       FIXP_QMF  **QmfBufferReal,           /*!< Pointer to real subband slots */
+                       FIXP_QMF  **QmfBufferImag,           /*!< Pointer to imag subband slots */
+                       const QMF_SCALE_FACTOR *scaleFactor, /*!< Scale factors of QMF data     */
+                       const int   ov_len,                  /*!< Length of band overlap        */
+                       INT_PCM    *timeOut,                 /*!< Time signal */
+                       const int   stride,                  /*!< Stride factor of audio data   */
+                       FIXP_QMF   *pWorkBuffer              /*!< pointer to temporal working buffer */
+                       );
+
+int
+qmfInitAnalysisFilterBank( HANDLE_QMF_FILTER_BANK h_Qmf, /*!< QMF Handle */
+                           FIXP_QAS *pFilterStates,      /*!< Pointer to filter state buffer */
+                           int noCols,                   /*!< Number of time slots  */
+                           int lsb,                      /*!< Number of lower bands */
+                           int usb,                      /*!< Number of upper bands */
+                           int no_channels,              /*!< Number of critically sampled bands */
+                           int flags);                   /*!< Flags */
+
+void
+qmfAnalysisFilteringSlot( HANDLE_QMF_FILTER_BANK anaQmf,  /*!< Handle of Qmf Synthesis Bank  */
+                          FIXP_QMF      *qmfReal,         /*!< Low and High band, real */
+                          FIXP_QMF      *qmfImag,         /*!< Low and High band, imag */
+                          const INT_PCM *timeIn,          /*!< Pointer to input */
+                          const int      stride,          /*!< stride factor of input */
+                          FIXP_QMF      *pWorkBuffer      /*!< pointer to temporal working buffer */
+                         );
+
+int
+qmfInitSynthesisFilterBank( HANDLE_QMF_FILTER_BANK h_Qmf, /*!< QMF Handle */
+                            FIXP_QSS *pFilterStates,      /*!< Pointer to filter state buffer */
+                            int noCols,                   /*!< Number of time slots  */
+                            int lsb,                      /*!< Number of lower bands */
+                            int usb,                      /*!< Number of upper bands */
+                            int no_channels,              /*!< Number of critically sampled bands */
+                            int flags);                   /*!< Flags */
+
+void qmfSynthesisFilteringSlot( HANDLE_QMF_FILTER_BANK  synQmf,
+                                const FIXP_QMF *realSlot,
+                                const FIXP_QMF *imagSlot,
+                                const int       scaleFactorLowBand,
+                                const int       scaleFactorHighBand,
+                                INT_PCM        *timeOut,
+                                const int       stride,
+                                FIXP_QMF       *pWorkBuffer);
+
+void
+qmfChangeOutScalefactor (HANDLE_QMF_FILTER_BANK synQmf,     /*!< Handle of Qmf Synthesis Bank */
+                         int outScalefactor                 /*!< New scaling factor for output data */
+                        );
+
+void
+qmfChangeOutGain (HANDLE_QMF_FILTER_BANK synQmf,     /*!< Handle of Qmf Synthesis Bank */
+                  FIXP_DBL outputGain                /*!< New gain for output data */
+                 );
+
+
+
+#endif /* __QMF_H */