Include patched FDK-AAC in the repository

The initial idea was to get the DAB+ patch into upstream, but since
that follows the android source releases, there is no place for a custom
DAB+ patch there.

So instead of having to maintain a patched fdk-aac that has to have the
same .so version as the distribution package on which it is installed,
we prefer having a separate fdk-aac-dab library to avoid collision.

At that point, there's no reason to keep fdk-aac in a separate
repository, as odr-audioenc is the only tool that needs DAB+ encoding
support. Including it here simplifies installation, and makes it
consistent with toolame-dab, also shipped in this repository.

DAB+ decoding support (needed by ODR-SourceCompanion, dablin, etisnoop,
welle.io and others) can be done using upstream FDK-AAC.

1 files changed, 182 insertions, 0 deletions

diff --git a/fdk-aac/libSBRdec/src/env_calc.h b/fdk-aac/libSBRdec/src/env_calc.h
new file mode 100644
index 0000000..cff365d
--- /dev/null
+++ b/fdk-aac/libSBRdec/src/env_calc.h
@@ -0,0 +1,182 @@
+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/**************************** SBR decoder library ******************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+/*!
+  \file
+  \brief  Envelope calculation prototypes
+*/
+#ifndef ENV_CALC_H
+#define ENV_CALC_H
+
+#include "sbrdecoder.h"
+#include "env_extr.h" /* for HANDLE_SBR_HEADER_DATA */
+
+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. */
+
+  ULONG harmFlagsPrev[ADD_HARMONICS_FLAGS_SIZE];
+  /*!< Words with 16 flags each indicating where a sine was added in the
+   * previous frame.*/
+  UCHAR harmIndex;     /*!< Current phase of synthetic sine */
+  int sbrPatchingMode; /*!< Current patching mode           */
+
+  FIXP_SGL prevSbrNoiseFloorLevel[MAX_NOISE_COEFFS];
+  UCHAR prevNNfb;
+  UCHAR prevNSfb[2];
+  UCHAR prevLoSubband;
+  UCHAR prevHiSubband;
+  UCHAR prev_ov_highSubband;
+  UCHAR *prevFreqBandTable[2];
+  UCHAR prevFreqBandTableLo[MAX_FREQ_COEFFS / 2 + 1];
+  UCHAR prevFreqBandTableHi[MAX_FREQ_COEFFS + 1];
+  UCHAR prevFreqBandTableNoise[MAX_NOISE_COEFFS + 1];
+  SCHAR sinusoidal_positionPrev;
+  ULONG harmFlagsPrevActive[ADD_HARMONICS_FLAGS_SIZE];
+} 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,
+    PVC_DYNAMIC_DATA *pPvcDynamicData, 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, UCHAR sbrPatchingMode,
+                  int xOverQmf[MAX_NUM_PATCHES], int sbrRatio);
+
+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