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License boilerplate update to follow. Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
182 lines
6.3 KiB
C
182 lines
6.3 KiB
C
/*************************** Fraunhofer IIS FDK Tools **********************
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(C) Copyright Fraunhofer IIS (2011)
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All Rights Reserved
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Please be advised that this software and/or program delivery is
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Confidential Information of Fraunhofer and subject to and covered by the
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Fraunhofer IIS Software Evaluation Agreement
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between Google Inc. and Fraunhofer
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effective and in full force since March 1, 2012.
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You may use this software and/or program only under the terms and
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conditions described in the above mentioned Fraunhofer IIS Software
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Evaluation Agreement. Any other and/or further use requires a separate agreement.
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$Id$
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Author(s): Manuel Jander, Josef Hoepfl
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Description: MDCT routines
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This software and/or program is protected by copyright law and international
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treaties. Any reproduction or distribution of this software and/or program,
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or any portion of it, may result in severe civil and criminal penalties, and
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will be prosecuted to the maximum extent possible under law.
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******************************************************************************/
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#ifndef __MDCT_H__
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#define __MDCT_H__
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#include "common_fix.h"
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#define MDCT_OUT_HEADROOM 2 /* Output additional headroom */
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#define MDCT_OUTPUT_SCALE (DFRACT_BITS-SAMPLE_BITS-MDCT_OUT_HEADROOM)
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/* Refer to "Output word length" in ISO/IEC 14496-3:2008(E) 23.2.3.6 */
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#define MDCT_OUTPUT_GAIN 16
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#if (SAMPLE_BITS == DFRACT_BITS)
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#define IMDCT_SCALE(x) (INT_PCM)SATURATE_LEFT_SHIFT(x, -MDCT_OUTPUT_SCALE, SAMPLE_BITS)
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#else
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#define IMDCT_SCALE(x) (INT_PCM)SATURATE_RIGHT_SHIFT(x, MDCT_OUTPUT_SCALE, SAMPLE_BITS)
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#endif
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#define IMDCT_SCALE_DBL(x) (FIXP_DBL)(x)
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/**
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* \brief MDCT persistent data
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*/
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typedef struct {
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union {
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FIXP_DBL *freq;
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FIXP_DBL *time;
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} overlap; /**< Pointer to overlap memory */
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const FIXP_WTP *prev_wrs; /**< pointer to previous right window slope */
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int prev_tl; /**< previous tranform length */
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int prev_nr; /**< previous right window offset */
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int prev_fr; /**< previous right window slope length */
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int ov_offset; /**< overlap time data fill level */
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int ov_size; /**< Overlap buffer size in words */
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} mdct_t;
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typedef mdct_t* H_MDCT;
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/**
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* \brief Initialize as valid MDCT handle
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*
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* \param hMdct handle of an allocated MDCT handle.
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* \param overlap pointer to FIXP_DBL overlap buffer.
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* \param overlapBufferSize size in FIXP_DBLs of the given overlap buffer.
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* \return void
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*/
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void mdct_init( H_MDCT hMdct,
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FIXP_DBL *overlap,
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INT overlapBufferSize );
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/**
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* \brief perform MDCT transform (time domain to frequency domain) with given parameters.
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*
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* \param hMdct handle of an allocated MDCT handle.
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* \param spectrum pointer to where the resulting MDCT spectrum will be stored into.
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* \param scalefactor pointer to the input scale shift value. Updated accordingly on return.
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* \param input pointer to input time domain signal
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* \param tl transformation length.
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* \param nr right window slope offset (amount of window coefficients assumed to be 1.0)
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* \param fr right overlap window slope length
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* \param wrs pointer to the right side overlap window coefficients.
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* \return number of input samples processed.
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*/
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INT mdct_block(
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H_MDCT hMdct,
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FIXP_DBL *spectrum,
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INT *scalefactor,
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INT_PCM *input,
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INT tl,
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INT nr,
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INT fr,
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const FIXP_WTB *wrs );
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/**
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* \brief add/multiply 2/N transform gain and MPEG4 part 3 defined output gain (see definition
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* of MDCT_OUTPUT_GAIN) to given mantissa factor and exponent.
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* \param pGain pointer to the mantissa of a gain factor to be applied to IMDCT data.
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* \param pExponent pointer to the exponent of a gain factor to be applied to IMDCT data.
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* \param tl length of the IMDCT where the gain *pGain * (2 ^ *pExponent) will be applied to.
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*/
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void imdct_gain(
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FIXP_DBL *pGain,
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int *pExponent,
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int tl
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);
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/**
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* \brief drain buffered output samples into given buffer. Changes the MDCT state.
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*/
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INT imdct_drain(
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H_MDCT hMdct,
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FIXP_DBL * pTimeData,
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INT nrSamplesRoom
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);
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/**
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* \brief Copy overlap time domain data to given buffer. Does not change the MDCT state.
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* \return number of actually copied samples (ov + nr).
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*/
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INT imdct_copy_ov_and_nr(
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H_MDCT hMdct,
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FIXP_DBL * pTimeData,
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INT nrSamples
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);
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/**
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* \brief Adapt MDCT parameters for non-matching window slopes.
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* \param hMdct handle of an allocated MDCT handle.
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* \param pfl pointer to left overlap window side length.
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* \param pnl pointer to length of the left n part of the window.
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* \param tl transform length.
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* \param wls pointer to the left side overlap window coefficients.
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* \param noOutSamples desired number of output samples.
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*/
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void imdct_adapt_parameters(H_MDCT hMdct, int *pfl, int *pnl, int tl, const FIXP_WTP *wls, int noOutSamples);
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/**
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* \brief perform several inverse MDCT transforms (frequency domain to time domain) with given parameters.
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*
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* \param hMdct handle of an allocated MDCT handle.
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* \param output pointer to where the output time domain signal will be stored into.
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* \param stride the stride factor for accessing time domain samples in output.
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* \param spectrum pointer to the input MDCT spectra.
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* \param scalefactors scale shift values of the input spectrum.
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* \param nSpec number of MDCT spectrums.
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* \param noOutSamples desired number of output samples.
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* \param tl transform length.
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* \param wls pointer to the left side overlap window coefficients.
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* \param fl left overlap window side length.
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* \param wrs pointer to the right side overlap window coefficients of all individual IMDCTs.
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* \param fr right overlap window side length of all individual IMDCTs.
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* \param gain factor to apply to output samples (if != 0).
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* \return number of output samples returned.
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*/
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INT imdct_block(
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H_MDCT hMdct,
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FIXP_DBL *output,
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FIXP_DBL *spectrum,
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const SHORT scalefactor[],
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const INT nSpec,
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const INT noOutSamples,
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const INT tl,
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const FIXP_WTP *wls,
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INT fl,
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const FIXP_WTP *wrs,
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const INT fr,
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FIXP_DBL gain );
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#endif /* __MDCT_H__ */
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