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-
-/* -----------------------------------------------------------------------------------------------------------
-Software License for The Fraunhofer FDK AAC Codec Library for Android
-
-© Copyright 1995 - 2013 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
------------------------------------------------------------------------------------------------------------ */
-
-/*************************** Fraunhofer IIS FDK Tools **********************
-
- Author(s): Manuel Jander, Josef Hoepfl
- Description: MDCT routines
-
-******************************************************************************/
-
-#ifndef __MDCT_H__
-#define __MDCT_H__
-
-
-
-#include "common_fix.h"
-
-#define MDCT_OUT_HEADROOM 2 /* Output additional headroom */
-#define MDCT_OUTPUT_SCALE (DFRACT_BITS-SAMPLE_BITS-MDCT_OUT_HEADROOM)
-/* Refer to "Output word length" in ISO/IEC 14496-3:2008(E) 23.2.3.6 */
-#define MDCT_OUTPUT_GAIN 16
-
-#if (SAMPLE_BITS == DFRACT_BITS)
-#define IMDCT_SCALE(x) (INT_PCM)SATURATE_LEFT_SHIFT(x, -MDCT_OUTPUT_SCALE, SAMPLE_BITS)
-#else
-#define IMDCT_SCALE(x) (INT_PCM)SATURATE_RIGHT_SHIFT(x, MDCT_OUTPUT_SCALE, SAMPLE_BITS)
-#endif
-#define IMDCT_SCALE_DBL(x) (FIXP_DBL)(x)
-
-/**
- * \brief MDCT persistent data
- */
-typedef struct {
- union {
- FIXP_DBL *freq;
- FIXP_DBL *time;
- } overlap; /**< Pointer to overlap memory */
-
- const FIXP_WTP *prev_wrs; /**< pointer to previous right window slope */
- int prev_tl; /**< previous tranform length */
- int prev_nr; /**< previous right window offset */
- int prev_fr; /**< previous right window slope length */
- int ov_offset; /**< overlap time data fill level */
- int ov_size; /**< Overlap buffer size in words */
-
-} mdct_t;
-
-typedef mdct_t* H_MDCT;
-
-/**
- * \brief Initialize as valid MDCT handle
- *
- * \param hMdct handle of an allocated MDCT handle.
- * \param overlap pointer to FIXP_DBL overlap buffer.
- * \param overlapBufferSize size in FIXP_DBLs of the given overlap buffer.
- * \return void
- */
-void mdct_init( H_MDCT hMdct,
- FIXP_DBL *overlap,
- INT overlapBufferSize );
-
-/**
- * \brief perform MDCT transform (time domain to frequency domain) with given parameters.
- *
- * \param hMdct handle of an allocated MDCT handle.
- * \param spectrum pointer to where the resulting MDCT spectrum will be stored into.
- * \param scalefactor pointer to the input scale shift value. Updated accordingly on return.
- * \param input pointer to input time domain signal
- * \param tl transformation length.
- * \param nr right window slope offset (amount of window coefficients assumed to be 1.0)
- * \param fr right overlap window slope length
- * \param wrs pointer to the right side overlap window coefficients.
- * \return number of input samples processed.
- */
-INT mdct_block(
- H_MDCT hMdct,
- FIXP_DBL *spectrum,
- INT *scalefactor,
- INT_PCM *input,
- INT tl,
- INT nr,
- INT fr,
- const FIXP_WTB *wrs );
-
-
-/**
- * \brief add/multiply 2/N transform gain and MPEG4 part 3 defined output gain (see definition
- * of MDCT_OUTPUT_GAIN) to given mantissa factor and exponent.
- * \param pGain pointer to the mantissa of a gain factor to be applied to IMDCT data.
- * \param pExponent pointer to the exponent of a gain factor to be applied to IMDCT data.
- * \param tl length of the IMDCT where the gain *pGain * (2 ^ *pExponent) will be applied to.
- */
-void imdct_gain(
- FIXP_DBL *pGain,
- int *pExponent,
- int tl
- );
-
-/**
- * \brief drain buffered output samples into given buffer. Changes the MDCT state.
- */
-INT imdct_drain(
- H_MDCT hMdct,
- FIXP_DBL * pTimeData,
- INT nrSamplesRoom
- );
-
-
-/**
- * \brief Copy overlap time domain data to given buffer. Does not change the MDCT state.
- * \return number of actually copied samples (ov + nr).
- */
-INT imdct_copy_ov_and_nr(
- H_MDCT hMdct,
- FIXP_DBL * pTimeData,
- INT nrSamples
- );
-
-/**
- * \brief Adapt MDCT parameters for non-matching window slopes.
- * \param hMdct handle of an allocated MDCT handle.
- * \param pfl pointer to left overlap window side length.
- * \param pnl pointer to length of the left n part of the window.
- * \param tl transform length.
- * \param wls pointer to the left side overlap window coefficients.
- * \param noOutSamples desired number of output samples.
- */
-void imdct_adapt_parameters(H_MDCT hMdct, int *pfl, int *pnl, int tl, const FIXP_WTP *wls, int noOutSamples);
-
-/**
- * \brief perform several inverse MDCT transforms (frequency domain to time domain) with given parameters.
- *
- * \param hMdct handle of an allocated MDCT handle.
- * \param output pointer to where the output time domain signal will be stored into.
- * \param stride the stride factor for accessing time domain samples in output.
- * \param spectrum pointer to the input MDCT spectra.
- * \param scalefactors scale shift values of the input spectrum.
- * \param nSpec number of MDCT spectrums.
- * \param noOutSamples desired number of output samples.
- * \param tl transform length.
- * \param wls pointer to the left side overlap window coefficients.
- * \param fl left overlap window side length.
- * \param wrs pointer to the right side overlap window coefficients of all individual IMDCTs.
- * \param fr right overlap window side length of all individual IMDCTs.
- * \param gain factor to apply to output samples (if != 0).
- * \return number of output samples returned.
- */
-INT imdct_block(
- H_MDCT hMdct,
- FIXP_DBL *output,
- FIXP_DBL *spectrum,
- const SHORT scalefactor[],
- const INT nSpec,
- const INT noOutSamples,
- const INT tl,
- const FIXP_WTP *wls,
- INT fl,
- const FIXP_WTP *wrs,
- const INT fr,
- FIXP_DBL gain );
-
-
-#endif /* __MDCT_H__ */