xref: /aosp_15_r20/external/aac/libDRCdec/src/drcDec_gainDecoder.h (revision e54365361535b070c2db7374cec45c159c7d0e7a)

/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

© Copyright  1995 - 2019 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
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Commercially-licensed AAC software libraries, including floating-point versions
with enhanced sound quality, are also available from Fraunhofer. Users are
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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.

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Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
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www.iis.fraunhofer.de/amm
[email protected]
----------------------------------------------------------------------------- */

/************************* MPEG-D DRC decoder library **************************

   Author(s):

   Description:

*******************************************************************************/

#ifndef DRCDEC_GAINDECODER_H
#define DRCDEC_GAINDECODER_H

#include "drcDecoder.h"

/* Definitions common to gainDecoder submodule */

#define NUM_LNB_FRAMES                                                         \
  5 /* previous frame + this frame + one frame for DM_REGULAR_DELAY + (maximum \
       delaySamples)/frameSize */

/* QMF64 */
#define SUBBAND_NUM_BANDS_QMF64 64
#define SUBBAND_DOWNSAMPLING_FACTOR_QMF64 64
#define SUBBAND_ANALYSIS_DELAY_QMF64 320

/* QMF71 (according to ISO/IEC 23003-1:2007) */
#define SUBBAND_NUM_BANDS_QMF71 71
#define SUBBAND_DOWNSAMPLING_FACTOR_QMF71 64
#define SUBBAND_ANALYSIS_DELAY_QMF71 320 + 384

/* STFT256 (according to ISO/IEC 23008-3:2015/AMD3) */
#define SUBBAND_NUM_BANDS_STFT256 256
#define SUBBAND_DOWNSAMPLING_FACTOR_STFT256 256
#define SUBBAND_ANALYSIS_DELAY_STFT256 256

typedef enum {
  GAIN_DEC_DRC1,
  GAIN_DEC_DRC1_DRC2,
  GAIN_DEC_DRC2,
  GAIN_DEC_DRC3,
  GAIN_DEC_DRC2_DRC3
} GAIN_DEC_LOCATION;

typedef enum { GAIN_DEC_FRAME_SIZE, GAIN_DEC_SAMPLE_RATE } GAIN_DEC_PARAM;

typedef struct {
  FIXP_DBL gainLin; /* e = 7 */
  SHORT time;
} NODE_LIN;

typedef struct {
  GAIN_INTERPOLATION_TYPE gainInterpolationType;
  int nNodes[NUM_LNB_FRAMES]; /* number of nodes, saturated to 16 */
  NODE_LIN linearNode[NUM_LNB_FRAMES][16];
} LINEAR_NODE_BUFFER;

typedef struct {
  int lnbPointer;
  LINEAR_NODE_BUFFER linearNodeBuffer[12];
  LINEAR_NODE_BUFFER dummyLnb;
  FIXP_DBL channelGain[8][NUM_LNB_FRAMES]; /* e = 8 */
} DRC_GAIN_BUFFERS;

typedef struct {
  int activeDrcOffset;
  DRC_INSTRUCTIONS_UNI_DRC* pInst;
  DRC_COEFFICIENTS_UNI_DRC* pCoef;

  DUCKING_MODIFICATION duckingModificationForChannelGroup[8];
  SCHAR channelGroupForChannel[8];

  UCHAR bandCountForChannelGroup[8];
  UCHAR gainElementForGroup[8];
  UCHAR channelGroupIsParametricDrc[8];
  UCHAR gainElementCount; /* number of different DRC gains inluding all DRC
                             bands */
  int lnbIndexForChannel[8][NUM_LNB_FRAMES];
  int subbandGainsReady;
} ACTIVE_DRC;

typedef struct {
  int deltaTminDefault;
  INT frameSize;
  FIXP_DBL loudnessNormalisationGainDb;
  DELAY_MODE delayMode;

  int nActiveDrcs;
  ACTIVE_DRC activeDrc[MAX_ACTIVE_DRCS];
  int multiBandActiveDrcIndex;
  int channelGainActiveDrcIndex;
  FIXP_DBL channelGain[8]; /* e = 8 */

  DRC_GAIN_BUFFERS drcGainBuffers;
  FIXP_DBL subbandGains[12][4 * 1024 / 256];
  FIXP_DBL dummySubbandGains[4 * 1024 / 256];

  int status;
  int timeDomainSupported;
  SUBBAND_DOMAIN_MODE subbandDomainSupported;
} DRC_GAIN_DECODER, *HANDLE_DRC_GAIN_DECODER;

/* init functions */
DRC_ERROR
drcDec_GainDecoder_Open(HANDLE_DRC_GAIN_DECODER* phGainDec);

DRC_ERROR
drcDec_GainDecoder_Init(HANDLE_DRC_GAIN_DECODER hGainDec);

DRC_ERROR
drcDec_GainDecoder_SetParam(HANDLE_DRC_GAIN_DECODER hGainDec,
                            const GAIN_DEC_PARAM paramType,
                            const int paramValue);

DRC_ERROR
drcDec_GainDecoder_SetCodecDependentParameters(
    HANDLE_DRC_GAIN_DECODER hGainDec, const DELAY_MODE delayMode,
    const int timeDomainSupported,
    const SUBBAND_DOMAIN_MODE subbandDomainSupported);

DRC_ERROR
drcDec_GainDecoder_Config(HANDLE_DRC_GAIN_DECODER hGainDec,
                          HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
                          const UCHAR numSelectedDrcSets,
                          const SCHAR* selectedDrcSetIds,
                          const UCHAR* selectedDownmixIds);

/* close functions */
DRC_ERROR
drcDec_GainDecoder_Close(HANDLE_DRC_GAIN_DECODER* phGainDec);

/* process functions */

/* call drcDec_GainDecoder_Preprocess first */
DRC_ERROR
drcDec_GainDecoder_Preprocess(HANDLE_DRC_GAIN_DECODER hGainDec,
                              HANDLE_UNI_DRC_GAIN hUniDrcGain,
                              const FIXP_DBL loudnessNormalizationGainDb,
                              const FIXP_SGL boost, const FIXP_SGL compress);

/* Then call one of drcDec_GainDecoder_ProcessTimeDomain or
 * drcDec_GainDecoder_ProcessSubbandDomain */
DRC_ERROR
drcDec_GainDecoder_ProcessTimeDomain(
    HANDLE_DRC_GAIN_DECODER hGainDec, const int delaySamples,
    const GAIN_DEC_LOCATION drcLocation, const int channelOffset,
    const int drcChannelOffset, const int numChannelsProcessed,
    const int timeDataChannelOffset, FIXP_DBL* audioIOBuffer);

DRC_ERROR
drcDec_GainDecoder_ProcessSubbandDomain(
    HANDLE_DRC_GAIN_DECODER hGainDec, const int delaySamples,
    GAIN_DEC_LOCATION drcLocation, const int channelOffset,
    const int drcChannelOffset, const int numChannelsProcessed,
    const int processSingleTimeslot, FIXP_DBL* audioIOBufferReal[],
    FIXP_DBL* audioIOBufferImag[]);

DRC_ERROR
drcDec_GainDecoder_Conceal(HANDLE_DRC_GAIN_DECODER hGainDec,
                           HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
                           HANDLE_UNI_DRC_GAIN hUniDrcGain);

DRC_ERROR
drcDec_GainDecoder_SetLoudnessNormalizationGainDb(
    HANDLE_DRC_GAIN_DECODER hGainDec, FIXP_DBL loudnessNormalizationGainDb);

int drcDec_GainDecoder_GetFrameSize(HANDLE_DRC_GAIN_DECODER hGainDec);

int drcDec_GainDecoder_GetDeltaTminDefault(HANDLE_DRC_GAIN_DECODER hGainDec);

void drcDec_GainDecoder_SetChannelGains(HANDLE_DRC_GAIN_DECODER hGainDec,
                                        const int numChannels,
                                        const int frameSize,
                                        const FIXP_DBL* channelGainDb,
                                        const int audioBufferChannelOffset,
                                        FIXP_DBL* audioBuffer);

#endif