xref: /aosp_15_r20/external/aac/libSACenc/src/sacenc_delay.cpp (revision e54365361535b070c2db7374cec45c159c7d0e7a)

/* -----------------------------------------------------------------------------
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
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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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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
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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
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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.

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You may use this FDK AAC Codec software or modifications thereto only for
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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
[email protected]
----------------------------------------------------------------------------- */

/*********************** MPEG surround encoder library *************************

   Author(s):   Christian Goettlinger

   Description: Encoder Library Interface
                delay management of the encoder

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

/**************************************************************************/ /**
 \file
 This file contains all delay infrastructure
 ******************************************************************************/

/* Includes ******************************************************************/
#include "sacenc_delay.h"
#include "sacenc_const.h"
#include "FDK_matrixCalloc.h"

/* Defines *******************************************************************/

/* Data Types ****************************************************************/
struct DELAY {
  struct DELAY_CONFIG {
    /* Routing Config Switches*/
    INT bDmxAlign;
    INT bTimeDomDmx;
    INT bMinimizeDelay;
    INT bSacTimeAlignmentDynamicOut;

    /* Needed Input Variables*/
    INT nQmfLen;
    INT nFrameLen;
    INT nSurroundDelay;
    INT nArbDmxDelay;
    INT nLimiterDelay;
    INT nCoreCoderDelay;
    INT nSacStreamMuxDelay;
    INT nSacTimeAlignment; /* Overwritten, if bSacTimeAlignmentDynamicOut */
  } config;

  /* Variable Delaybuffers -> Delays */
  INT nDmxAlignBuffer;
  INT nSurroundAnalysisBuffer;
  INT nArbDmxAnalysisBuffer;
  INT nOutputAudioBuffer;
  INT nBitstreamFrameBuffer;
  INT nOutputAudioQmfFrameBuffer;
  INT nDiscardOutFrames;

  /* Variable Delaybuffers Computation Variables */
  INT nBitstreamFrameBufferSize;

  /* Output: Infos */
  INT nInfoDmxDelay; /* Delay of the downmixed signal after the space encoder */
  INT nInfoCodecDelay; /* Delay of the whole en-/decoder including CoreCoder */
  INT nInfoDecoderDelay; /* Delay of the Mpeg Surround decoder */
};

/* Constants *****************************************************************/

/* Function / Class Declarations *********************************************/

/* Function / Class Definition ***********************************************/

/*-----------------------------------------------------------------------------
functionname: fdk_sacenc_delay_Open()
description:  initializes Delays
returns:      noError on success, an apropriate error code else
-----------------------------------------------------------------------------*/
FDK_SACENC_ERROR fdk_sacenc_delay_Open(HANDLE_DELAY *phDelay) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == phDelay) {
    error = SACENC_INVALID_HANDLE;
  } else {
    FDK_ALLOCATE_MEMORY_1D(*phDelay, 1, struct DELAY);
  }
  return error;

bail:
  fdk_sacenc_delay_Close(phDelay);
  return ((SACENC_OK == error) ? SACENC_MEMORY_ERROR : error);
}

/*-----------------------------------------------------------------------------
functionname: fdk_sacenc_delay_Close()
description:  destructs Delay
returns:      noError on success, an apropriate error code else
-----------------------------------------------------------------------------*/
FDK_SACENC_ERROR fdk_sacenc_delay_Close(HANDLE_DELAY *phDelay) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == phDelay) {
    error = SACENC_INVALID_HANDLE;
  } else {
    if (NULL != *phDelay) {
      FDK_FREE_MEMORY_1D(*phDelay);
    }
  }
  return error;
}

FDK_SACENC_ERROR fdk_sacenc_delay_Init(HANDLE_DELAY hDelay, const INT nQmfLen,
                                       const INT nFrameLen,
                                       const INT nCoreCoderDelay,
                                       const INT nSacStreamMuxDelay) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == hDelay) {
    error = SACENC_INVALID_HANDLE;
  } else {
    /* Fill structure before calculation */
    FDKmemclear(&hDelay->config, sizeof(hDelay->config));

    hDelay->config.nQmfLen = nQmfLen;
    hDelay->config.nFrameLen = nFrameLen;
    hDelay->config.nCoreCoderDelay = nCoreCoderDelay;
    hDelay->config.nSacStreamMuxDelay = nSacStreamMuxDelay;
  }
  return error;
}

/*-----------------------------------------------------------------------------
functionname: fdk_sacenc_delay_SubCalulateBufferDelays()
description:  Calculates the Delays of the buffers
returns:      Error Code
-----------------------------------------------------------------------------*/
FDK_SACENC_ERROR fdk_sacenc_delay_SubCalulateBufferDelays(HANDLE_DELAY hDel) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == hDel) {
    error = SACENC_INVALID_HANDLE;
  } else {
    int nEncoderAnDelay, nEncoderSynDelay, nEncoderWinDelay, nDecoderAnDelay,
        nDecoderSynDelay, nResidualCoderFrameDelay,
        nArbDmxResidualCoderFrameDelay;

    if (hDel->config.bSacTimeAlignmentDynamicOut > 0) {
      hDel->config.nSacTimeAlignment = 0;
    }

    {
      nEncoderAnDelay =
          2 * hDel->config.nQmfLen +
          hDel->config.nQmfLen / 2; /* Only Ld-QMF Delay, no hybrid */
      nEncoderSynDelay = 1 * hDel->config.nQmfLen + hDel->config.nQmfLen / 2;
      nDecoderAnDelay = 2 * hDel->config.nQmfLen + hDel->config.nQmfLen / 2;
      nDecoderSynDelay = 1 * hDel->config.nQmfLen + hDel->config.nQmfLen / 2;
      nEncoderWinDelay =
          hDel->config.nFrameLen / 2; /* WindowLookahead is just half a frame */
    }

    { nResidualCoderFrameDelay = 0; }

    { nArbDmxResidualCoderFrameDelay = 0; }

    /* Calculate variable Buffer-Delays */
    if (hDel->config.bTimeDomDmx == 0) {
      /* ArbitraryDmx and TdDmx off */
      int tempDelay;

      hDel->nSurroundAnalysisBuffer = 0;
      hDel->nArbDmxAnalysisBuffer = 0;
      tempDelay = nEncoderSynDelay + hDel->config.nLimiterDelay +
                  hDel->config.nCoreCoderDelay +
                  hDel->config.nSacTimeAlignment + nDecoderAnDelay;
      tempDelay = (nResidualCoderFrameDelay * hDel->config.nFrameLen) +
                  hDel->config.nSacStreamMuxDelay - tempDelay;

      if (tempDelay > 0) {
        hDel->nBitstreamFrameBuffer = 0;
        hDel->nOutputAudioBuffer = tempDelay;
      } else {
        tempDelay = -tempDelay;
        hDel->nBitstreamFrameBuffer =
            (tempDelay + hDel->config.nFrameLen - 1) / hDel->config.nFrameLen;
        hDel->nOutputAudioBuffer =
            (hDel->nBitstreamFrameBuffer * hDel->config.nFrameLen) - tempDelay;
      }

      hDel->nOutputAudioQmfFrameBuffer =
          (hDel->nOutputAudioBuffer + (hDel->config.nQmfLen / 2) - 1) /
          hDel->config.nQmfLen;

      if (hDel->config.bDmxAlign > 0) {
        tempDelay = nEncoderWinDelay + nEncoderAnDelay + nEncoderSynDelay +
                    hDel->nOutputAudioBuffer + hDel->config.nLimiterDelay +
                    hDel->config.nCoreCoderDelay;
        hDel->nDiscardOutFrames =
            (tempDelay + hDel->config.nFrameLen - 1) / hDel->config.nFrameLen;
        hDel->nDmxAlignBuffer =
            hDel->nDiscardOutFrames * hDel->config.nFrameLen - tempDelay;
      } else {
        hDel->nDiscardOutFrames = 0;
        hDel->nDmxAlignBuffer = 0;
      }

      /* Output: Info-Variables */
      hDel->nInfoDmxDelay = hDel->nSurroundAnalysisBuffer + nEncoderAnDelay +
                            nEncoderWinDelay + nEncoderSynDelay +
                            hDel->nOutputAudioBuffer +
                            hDel->config.nLimiterDelay;
      hDel->nInfoCodecDelay =
          hDel->nInfoDmxDelay + hDel->config.nCoreCoderDelay +
          hDel->config.nSacTimeAlignment + nDecoderAnDelay + nDecoderSynDelay;

    } else {
      /* ArbitraryDmx or TdDmx on */
      int tempDelay1, tempDelay2, tempDelay12, tempDelay3;

      tempDelay1 = hDel->config.nArbDmxDelay - hDel->config.nSurroundDelay;

      if (tempDelay1 >= 0) {
        hDel->nSurroundAnalysisBuffer = tempDelay1;
        hDel->nArbDmxAnalysisBuffer = 0;
      } else {
        hDel->nSurroundAnalysisBuffer = 0;
        hDel->nArbDmxAnalysisBuffer = -tempDelay1;
      }

      tempDelay1 = nEncoderWinDelay + hDel->config.nSurroundDelay +
                   hDel->nSurroundAnalysisBuffer +
                   nEncoderAnDelay; /*Surround Path*/
      tempDelay2 = nEncoderWinDelay + hDel->config.nArbDmxDelay +
                   hDel->nArbDmxAnalysisBuffer +
                   nEncoderAnDelay; /* ArbDmx Compare Path */
      tempDelay3 = hDel->config.nArbDmxDelay + hDel->config.nLimiterDelay +
                   hDel->config.nCoreCoderDelay +
                   hDel->config.nSacTimeAlignment +
                   nDecoderAnDelay; /* ArbDmx Passthrough*/

      tempDelay12 =
          FDKmax(nResidualCoderFrameDelay, nArbDmxResidualCoderFrameDelay) *
          hDel->config.nFrameLen;
      tempDelay12 += hDel->config.nSacStreamMuxDelay;

      if (tempDelay1 > tempDelay2) {
        tempDelay12 += tempDelay1;
      } else {
        tempDelay12 += tempDelay2;
      }

      if (tempDelay3 > tempDelay12) {
        if (hDel->config.bMinimizeDelay > 0) {
          hDel->nBitstreamFrameBuffer =
              (tempDelay3 - tempDelay12) / hDel->config.nFrameLen; /*floor*/
          hDel->nOutputAudioBuffer = 0;
          hDel->nSurroundAnalysisBuffer +=
              (tempDelay3 - tempDelay12 -
               (hDel->nBitstreamFrameBuffer * hDel->config.nFrameLen));
          hDel->nArbDmxAnalysisBuffer +=
              (tempDelay3 - tempDelay12 -
               (hDel->nBitstreamFrameBuffer * hDel->config.nFrameLen));
        } else {
          hDel->nBitstreamFrameBuffer =
              ((tempDelay3 - tempDelay12) + hDel->config.nFrameLen - 1) /
              hDel->config.nFrameLen;
          hDel->nOutputAudioBuffer =
              hDel->nBitstreamFrameBuffer * hDel->config.nFrameLen +
              tempDelay12 - tempDelay3;
        }
      } else {
        hDel->nBitstreamFrameBuffer = 0;
        hDel->nOutputAudioBuffer = tempDelay12 - tempDelay3;
      }

      if (hDel->config.bDmxAlign > 0) {
        int tempDelay = hDel->config.nArbDmxDelay + hDel->nOutputAudioBuffer +
                        hDel->config.nLimiterDelay +
                        hDel->config.nCoreCoderDelay;
        hDel->nDiscardOutFrames =
            (tempDelay + hDel->config.nFrameLen - 1) / hDel->config.nFrameLen;
        hDel->nDmxAlignBuffer =
            hDel->nDiscardOutFrames * hDel->config.nFrameLen - tempDelay;
      } else {
        hDel->nDiscardOutFrames = 0;
        hDel->nDmxAlignBuffer = 0;
      }

      /* Output: Info-Variables */
      hDel->nInfoDmxDelay = hDel->config.nArbDmxDelay +
                            hDel->nOutputAudioBuffer +
                            hDel->config.nLimiterDelay;
      hDel->nInfoCodecDelay =
          hDel->nInfoDmxDelay + hDel->config.nCoreCoderDelay +
          hDel->config.nSacTimeAlignment + nDecoderAnDelay + nDecoderSynDelay;
      hDel->nInfoDecoderDelay = nDecoderAnDelay + nDecoderSynDelay;

    } /* ArbitraryDmx or TdDmx on */

    /* Additonal Variables needed for Computation Issues */
    hDel->nBitstreamFrameBufferSize = hDel->nBitstreamFrameBuffer + 1;
  }

  return error;
}

static FDK_SACENC_ERROR assignParameterInRange(
    const INT startRange, /* including startRange */
    const INT stopRange,  /* including stopRange */
    const INT value,      /* value to write*/
    INT *const ptr        /* destination pointer*/
) {
  FDK_SACENC_ERROR error = SACENC_INVALID_CONFIG;

  if ((startRange <= value) && (value <= stopRange)) {
    *ptr = value;
    error = SACENC_OK;
  }

  return error;
}

FDK_SACENC_ERROR fdk_sacenc_delay_SetDmxAlign(HANDLE_DELAY hDelay,
                                              const INT bDmxAlignIn) {
  return (assignParameterInRange(0, 1, bDmxAlignIn, &hDelay->config.bDmxAlign));
}

FDK_SACENC_ERROR fdk_sacenc_delay_SetTimeDomDmx(HANDLE_DELAY hDelay,
                                                const INT bTimeDomDmxIn) {
  return (
      assignParameterInRange(0, 1, bTimeDomDmxIn, &hDelay->config.bTimeDomDmx));
}

FDK_SACENC_ERROR fdk_sacenc_delay_SetSacTimeAlignmentDynamicOut(
    HANDLE_DELAY hDelay, const INT bSacTimeAlignmentDynamicOutIn) {
  return (assignParameterInRange(0, 1, bSacTimeAlignmentDynamicOutIn,
                                 &hDelay->config.bSacTimeAlignmentDynamicOut));
}

FDK_SACENC_ERROR fdk_sacenc_delay_SetNSacTimeAlignment(
    HANDLE_DELAY hDelay, const INT nSacTimeAlignmentIn) {
  return (assignParameterInRange(-32768, 32767, nSacTimeAlignmentIn,
                                 &hDelay->config.nSacTimeAlignment));
}

FDK_SACENC_ERROR fdk_sacenc_delay_SetMinimizeDelay(HANDLE_DELAY hDelay,
                                                   const INT bMinimizeDelay) {
  return (assignParameterInRange(0, 1, bMinimizeDelay,
                                 &hDelay->config.bMinimizeDelay));
}

INT fdk_sacenc_delay_GetOutputAudioBufferDelay(HANDLE_DELAY hDelay) {
  return (hDelay->nOutputAudioBuffer);
}

INT fdk_sacenc_delay_GetSurroundAnalysisBufferDelay(HANDLE_DELAY hDelay) {
  return (hDelay->nSurroundAnalysisBuffer);
}

INT fdk_sacenc_delay_GetArbDmxAnalysisBufferDelay(HANDLE_DELAY hDelay) {
  return (hDelay->nArbDmxAnalysisBuffer);
}

INT fdk_sacenc_delay_GetBitstreamFrameBufferSize(HANDLE_DELAY hDelay) {
  return (hDelay->nBitstreamFrameBufferSize);
}

INT fdk_sacenc_delay_GetDmxAlignBufferDelay(HANDLE_DELAY hDelay) {
  return (hDelay->nDmxAlignBuffer);
}

INT fdk_sacenc_delay_GetDiscardOutFrames(HANDLE_DELAY hDelay) {
  return (hDelay->nDiscardOutFrames);
}

INT fdk_sacenc_delay_GetInfoDmxDelay(HANDLE_DELAY hDelay) {
  return (hDelay->nInfoDmxDelay);
}

INT fdk_sacenc_delay_GetInfoCodecDelay(HANDLE_DELAY hDelay) {
  return (hDelay->nInfoCodecDelay);
}

INT fdk_sacenc_delay_GetInfoDecoderDelay(HANDLE_DELAY hDelay) {
  return (hDelay->nInfoDecoderDelay);
}