path: root/fdk-aac/libSACenc/src/sacenc_framewindowing.cpp

/* -----------------------------------------------------------------------------
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
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Commercially-licensed AAC software libraries, including floating-point versions
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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
amm-info@iis.fraunhofer.de
----------------------------------------------------------------------------- */

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

   Author(s):   Max Neuendorf

   Description: Encoder Library Interface
                Get windows for framing

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

/**************************************************************************/ /**
   \file
   Description of file contents
 ******************************************************************************/

/* Includes ******************************************************************/
#include "sacenc_framewindowing.h"
#include "sacenc_vectorfunctions.h"

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

/* Data Types ****************************************************************/
typedef struct T_FRAMEWINDOW {
  INT nTimeSlotsMax;
  INT bFrameKeep;
  INT startSlope;
  INT stopSlope;
  INT startRect;
  INT stopRect;

  INT taperAnaLen;
  INT taperSynLen;
  FIXP_WIN pTaperAna__FDK[MAX_TIME_SLOTS];
  FIXP_WIN pTaperSyn__FDK[MAX_TIME_SLOTS];

} FRAMEWINDOW;

typedef enum {
  FIX_INVALID = -1,
  FIX_RECT_SMOOTH = 0,
  FIX_SMOOTH_RECT = 1,
  FIX_LARGE_SMOOTH = 2,
  FIX_RECT_TRIANG = 3

} FIX_TYPE;

typedef enum {
  VAR_INVALID = -1,
  VAR_HOLD = 0,
  VAR_ISOLATE = 1

} VAR_TYPE;

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

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

/* Function / Class Definition ***********************************************/
static void calcTaperWin(FIXP_WIN *pTaperWin, INT timeSlots) {
  FIXP_DBL x;
  int i, scale;

  for (i = 0; i < timeSlots; i++) {
    x = fDivNormHighPrec((FIXP_DBL)i, (FIXP_DBL)timeSlots, &scale);

    if (scale < 0) {
      pTaperWin[i] = FX_DBL2FX_WIN(x >> (-scale));
    } else {
      pTaperWin[i] = FX_DBL2FX_WIN(x << (scale));
    }
  }
  pTaperWin[timeSlots] = FX_DBL2FX_WIN((FIXP_DBL)MAXVAL_DBL);
}

FDK_SACENC_ERROR fdk_sacenc_frameWindow_Create(
    HANDLE_FRAMEWINDOW *phFrameWindow) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == phFrameWindow) {
    error = SACENC_INVALID_HANDLE;
  } else {
    /* Memory Allocation */
    FDK_ALLOCATE_MEMORY_1D(*phFrameWindow, 1, FRAMEWINDOW);
  }
  return error;

bail:
  fdk_sacenc_frameWindow_Destroy(phFrameWindow);
  return ((SACENC_OK == error) ? SACENC_MEMORY_ERROR : error);
}

FDK_SACENC_ERROR fdk_sacenc_frameWindow_Init(
    HANDLE_FRAMEWINDOW hFrameWindow,
    const FRAMEWINDOW_CONFIG *const pFrameWindowConfig) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if ((hFrameWindow == NULL) || (pFrameWindowConfig == NULL)) {
    error = SACENC_INVALID_HANDLE;
  } else if (pFrameWindowConfig->nTimeSlotsMax < 0) {
    error = SACENC_INIT_ERROR;
  } else {
    int ts;
    hFrameWindow->bFrameKeep = pFrameWindowConfig->bFrameKeep;
    hFrameWindow->nTimeSlotsMax = pFrameWindowConfig->nTimeSlotsMax;

    FIXP_WIN winMaxVal = FX_DBL2FX_WIN((FIXP_DBL)MAXVAL_DBL);
    int timeSlots = pFrameWindowConfig->nTimeSlotsMax;
    {
      hFrameWindow->startSlope = 0;
      hFrameWindow->stopSlope = ((3 * timeSlots) >> 1) - 1;
      hFrameWindow->startRect = timeSlots >> 1;
      hFrameWindow->stopRect = timeSlots;
      calcTaperWin(hFrameWindow->pTaperSyn__FDK, timeSlots >> 1);
      hFrameWindow->taperSynLen = timeSlots >> 1;
    }

    /* Calculate Taper for non-rect. ana. windows */
    hFrameWindow->taperAnaLen =
        hFrameWindow->startRect - hFrameWindow->startSlope;
    for (ts = 0; ts < hFrameWindow->taperAnaLen; ts++) {
      { hFrameWindow->pTaperAna__FDK[ts] = winMaxVal; }
    }
  }

  return error;
}

FDK_SACENC_ERROR fdk_sacenc_frameWindow_Destroy(
    HANDLE_FRAMEWINDOW *phFrameWindow) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if ((NULL != phFrameWindow) && (NULL != *phFrameWindow)) {
    FDKfree(*phFrameWindow);
    *phFrameWindow = NULL;
  }
  return error;
}

static FDK_SACENC_ERROR FrameWinList_Reset(FRAMEWIN_LIST *const pFrameWinList) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == pFrameWinList) {
    error = SACENC_INVALID_HANDLE;
  } else {
    int k = 0;
    for (k = 0; k < MAX_NUM_PARAMS; k++) {
      pFrameWinList->dat[k].slot = -1;
      pFrameWinList->dat[k].hold = FW_INTP;
    }
    pFrameWinList->n = 0;
  }
  return error;
}

static FDK_SACENC_ERROR FrameWindowList_Add(FRAMEWIN_LIST *const pFrameWinList,
                                            const INT slot,
                                            const FW_SLOTTYPE hold) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == pFrameWinList) {
    error = SACENC_INVALID_HANDLE;
  } else {
    if (pFrameWinList->n >= MAX_NUM_PARAMS) { /* Place left in List ?*/
      error = SACENC_PARAM_ERROR;
    } else if (pFrameWinList->n > 0 &&
               pFrameWinList->dat[pFrameWinList->n - 1].slot - slot > 0) {
      error = SACENC_PARAM_ERROR;
    } else {
      pFrameWinList->dat[pFrameWinList->n].slot = slot;
      pFrameWinList->dat[pFrameWinList->n].hold = hold;
      pFrameWinList->n++;
    }
  }
  return error;
}

static FDK_SACENC_ERROR FrameWindowList_Remove(
    FRAMEWIN_LIST *const pFrameWinList, const INT idx) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == pFrameWinList) {
    error = SACENC_INVALID_HANDLE;
  } else {
    int k = 0;
    if (idx < 0 || idx >= MAX_NUM_PARAMS) {
      error = SACENC_PARAM_ERROR;
    } else if (pFrameWinList->n > 0) {
      if (idx == MAX_NUM_PARAMS - 1) {
        pFrameWinList->dat[idx].slot = -1;
        pFrameWinList->dat[idx].hold = FW_INTP;
      } else {
        for (k = idx; k < MAX_NUM_PARAMS - 1; k++) {
          pFrameWinList->dat[k] = pFrameWinList->dat[k + 1];
        }
      }
      pFrameWinList->n--;
    }
  }
  return error;
}

static FDK_SACENC_ERROR FrameWindowList_Limit(
    FRAMEWIN_LIST *const pFrameWinList, const INT ll /*lower limit*/,
    const INT ul /*upper limit*/
) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if (NULL == pFrameWinList) {
    error = SACENC_INVALID_HANDLE;
  } else {
    int k = 0;
    for (k = 0; k < pFrameWinList->n; k++) {
      if (pFrameWinList->dat[k].slot < ll || pFrameWinList->dat[k].slot > ul) {
        FrameWindowList_Remove(pFrameWinList, k);
        --k;
      }
    }
  }
  return error;
}

FDK_SACENC_ERROR fdk_sacenc_frameWindow_GetWindow(
    HANDLE_FRAMEWINDOW hFrameWindow, INT tr_pos[MAX_NUM_PARAMS],
    const INT timeSlots, FRAMINGINFO *const pFramingInfo,
    FIXP_WIN *pWindowAna__FDK[MAX_NUM_PARAMS],
    FRAMEWIN_LIST *const pFrameWinList, const INT avoid_keep) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if ((hFrameWindow == NULL) || (tr_pos == NULL) || (pFramingInfo == NULL) ||
      (pFrameWinList == NULL) || (pWindowAna__FDK == NULL)) {
    error = SACENC_INVALID_HANDLE;
  } else {
    const VAR_TYPE varType = VAR_HOLD;
    const int tranL = 4;
    int winCnt = 0;
    int w, ps;

    int startSlope = hFrameWindow->startSlope;
    int stopSlope = hFrameWindow->stopSlope;
    int startRect = hFrameWindow->startRect;
    int stopRect = hFrameWindow->stopRect;
    int taperAnaLen = hFrameWindow->taperAnaLen;

    FIXP_WIN winMaxVal = FX_DBL2FX_WIN((FIXP_DBL)MAXVAL_DBL);
    FIXP_WIN applyRightWindowGain__FDK[MAX_NUM_PARAMS];
    FIXP_WIN *pTaperAna__FDK = hFrameWindow->pTaperAna__FDK;

    /* sanity check */
    for (ps = 0; ps < MAX_NUM_PARAMS; ps++) {
      if (pWindowAna__FDK[ps] == NULL) {
        error = SACENC_INVALID_HANDLE;
        goto bail;
      }
    }

    if ((timeSlots > hFrameWindow->nTimeSlotsMax) || (timeSlots < 0)) {
      error = SACENC_INVALID_CONFIG;
      goto bail;
    }

    /* Reset */
    if (SACENC_OK != (error = FrameWinList_Reset(pFrameWinList))) goto bail;

    FDKmemclear(applyRightWindowGain__FDK, sizeof(applyRightWindowGain__FDK));

    if (tr_pos[0] > -1) { /* Transients in first (left) half? */
      int p_l = tr_pos[0];
      winCnt = 0;

      /* Create Parameter Positions */
      switch (varType) {
        case VAR_HOLD:
          if (SACENC_OK !=
              (error = FrameWindowList_Add(pFrameWinList, p_l - 1, FW_HOLD)))
            goto bail;
          if (SACENC_OK !=
              (error = FrameWindowList_Add(pFrameWinList, p_l, FW_INTP)))
            goto bail;
          break;
        case VAR_ISOLATE:
          if (SACENC_OK !=
              (error = FrameWindowList_Add(pFrameWinList, p_l - 1, FW_HOLD)))
            goto bail;
          if (SACENC_OK !=
              (error = FrameWindowList_Add(pFrameWinList, p_l, FW_INTP)))
            goto bail;
          if (SACENC_OK != (error = FrameWindowList_Add(pFrameWinList,
                                                        p_l + tranL, FW_HOLD)))
            goto bail;
          if (SACENC_OK != (error = FrameWindowList_Add(
                                pFrameWinList, p_l + tranL + 1, FW_INTP)))
            goto bail;
          break;
        default:
          error = SACENC_INVALID_CONFIG;
          break;
      }

      /* Outside of frame? => Kick Out */
      if (SACENC_OK !=
          (error = FrameWindowList_Limit(pFrameWinList, 0, timeSlots - 1)))
        goto bail;

      /* Add timeSlots as temporary border for window creation */
      if (SACENC_OK !=
          (error = FrameWindowList_Add(pFrameWinList, timeSlots - 1, FW_HOLD)))
        goto bail;

      /* Create Windows */
      for (ps = 0; ps < pFrameWinList->n - 1; ps++) {
        if (FW_HOLD != pFrameWinList->dat[ps].hold) {
          int const start = pFrameWinList->dat[ps].slot;
          int const stop = pFrameWinList->dat[ps + 1].slot;

          /* Analysis Window */
          FDKmemset_flex(pWindowAna__FDK[winCnt], FX_DBL2FX_WIN((FIXP_DBL)0),
                         start);
          FDKmemset_flex(&pWindowAna__FDK[winCnt][start], winMaxVal,
                         stop - start + 1);
          FDKmemset_flex(&pWindowAna__FDK[winCnt][stop + 1],
                         FX_DBL2FX_WIN((FIXP_DBL)0), timeSlots - stop - 1);

          applyRightWindowGain__FDK[winCnt] =
              pWindowAna__FDK[winCnt][timeSlots - 1];
          winCnt++;
        }
      } /* ps */

      /* Pop temporary frame border */
      if (SACENC_OK !=
          (error = FrameWindowList_Remove(pFrameWinList, pFrameWinList->n - 1)))
        goto bail;
    } else { /* No transient in left half of ana. window */
      winCnt = 0;

      /* Add paramter set at end of frame */
      if (SACENC_OK !=
          (error = FrameWindowList_Add(pFrameWinList, timeSlots - 1, FW_INTP)))
        goto bail;
      /* Analysis Window */
      FDKmemset_flex(pWindowAna__FDK[winCnt], FX_DBL2FX_WIN((FIXP_DBL)0),
                     startSlope);
      FDKmemcpy_flex(&pWindowAna__FDK[winCnt][startSlope], 1, pTaperAna__FDK, 1,
                     taperAnaLen);
      FDKmemset_flex(&pWindowAna__FDK[winCnt][startRect], winMaxVal,
                     timeSlots - startRect);

      applyRightWindowGain__FDK[winCnt] = winMaxVal;
      winCnt++;
    } /* if (tr_pos[0] > -1) */

    for (w = 0; w < winCnt; w++) {
      if (applyRightWindowGain__FDK[w] > (FIXP_WIN)0) {
        if (tr_pos[1] > -1) { /* Transients in second (right) half? */
          int p_r = tr_pos[1];

          /* Analysis Window */
          FDKmemset_flex(&pWindowAna__FDK[w][timeSlots], winMaxVal,
                         p_r - timeSlots);
          FDKmemset_flex(&pWindowAna__FDK[w][p_r], FX_DBL2FX_WIN((FIXP_DBL)0),
                         2 * timeSlots - p_r);

        } else { /* No transient in right half of ana. window */
          /* Analysis Window */
          FDKmemset_flex(&pWindowAna__FDK[w][timeSlots], winMaxVal,
                         stopRect - timeSlots + 1);
          FDKmemcpy_flex(&pWindowAna__FDK[w][stopRect], 1,
                         &pTaperAna__FDK[taperAnaLen - 1], -1, taperAnaLen);
          FDKmemset_flex(&pWindowAna__FDK[w][stopSlope + 1],
                         FX_DBL2FX_WIN((FIXP_DBL)0),
                         2 * timeSlots - stopSlope - 1);

        } /* if (tr_pos[1] > -1) */

        /* Weight */
        if (applyRightWindowGain__FDK[w] < winMaxVal) {
          int ts;
          for (ts = 0; ts < timeSlots; ts++) {
            pWindowAna__FDK[w][timeSlots + ts] =
                FX_DBL2FX_WIN(fMult(pWindowAna__FDK[w][timeSlots + ts],
                                    applyRightWindowGain__FDK[w]));
          }
        }
      } /* if (applyRightWindowGain[w] > 0.0f) */
      else {
        /* All Zero */
        FDKmemset_flex(&pWindowAna__FDK[w][timeSlots],
                       FX_DBL2FX_WIN((FIXP_DBL)0), timeSlots);
      }
    } /* loop over windows */

    if (hFrameWindow->bFrameKeep == 1) {
      FDKmemcpy_flex(&pWindowAna__FDK[0][2 * timeSlots], 1,
                     &pWindowAna__FDK[0][timeSlots], 1, timeSlots);
      FDKmemcpy_flex(&pWindowAna__FDK[0][timeSlots], 1, pWindowAna__FDK[0], 1,
                     timeSlots);

      if (avoid_keep != 0) {
        FDKmemset_flex(pWindowAna__FDK[0], FX_DBL2FX_WIN((FIXP_DBL)0),
                       timeSlots);
      } else {
        FDKmemset_flex(pWindowAna__FDK[0], winMaxVal, timeSlots);
      }
    } /* if (hFrameWindow->bFrameKeep==1) */

    /* Feed Info to Bitstream Formatter */
    pFramingInfo->numParamSets = pFrameWinList->n;
    pFramingInfo->bsFramingType = 1; /* variable framing */
    for (ps = 0; ps < pFramingInfo->numParamSets; ps++) {
      pFramingInfo->bsParamSlots[ps] = pFrameWinList->dat[ps].slot;
    }

    /* if there is just one param set at last slot,
       use fixed framing to save some bits */
    if ((pFramingInfo->numParamSets == 1) &&
        (pFramingInfo->bsParamSlots[0] == timeSlots - 1)) {
      pFramingInfo->bsFramingType = 0;
    }

  } /* valid handle */

bail:

  return error;
}

FDK_SACENC_ERROR fdk_sacenc_analysisWindowing(
    const INT nTimeSlots, const INT startTimeSlot,
    FIXP_WIN *pFrameWindowAna__FDK, const FIXP_DPK *const *const ppDataIn__FDK,
    FIXP_DPK *const *const ppDataOut__FDK, const INT nHybridBands,
    const INT dim) {
  FDK_SACENC_ERROR error = SACENC_OK;

  if ((pFrameWindowAna__FDK == NULL) || (ppDataIn__FDK == NULL) ||
      (ppDataOut__FDK == NULL)) {
    error = SACENC_INVALID_HANDLE;
  } else {
    int i, ts;
    FIXP_WIN maxVal = FX_DBL2FX_WIN((FIXP_DBL)MAXVAL_DBL);

    if (dim == FW_CHANGE_DIM) {
      for (ts = startTimeSlot; ts < nTimeSlots; ts++) {
        FIXP_WIN win = pFrameWindowAna__FDK[ts];
        if (win == maxVal) {
          for (i = 0; i < nHybridBands; i++) {
            ppDataOut__FDK[i][ts].v.re = ppDataIn__FDK[ts][i].v.re;
            ppDataOut__FDK[i][ts].v.im = ppDataIn__FDK[ts][i].v.im;
          }
        } else {
          for (i = 0; i < nHybridBands; i++) {
            ppDataOut__FDK[i][ts].v.re = fMult(win, ppDataIn__FDK[ts][i].v.re);
            ppDataOut__FDK[i][ts].v.im = fMult(win, ppDataIn__FDK[ts][i].v.im);
          }
        }
      } /* ts */
    } else {
      for (ts = startTimeSlot; ts < nTimeSlots; ts++) {
        FIXP_WIN win = pFrameWindowAna__FDK[ts];
        if (win == maxVal) {
          for (i = 0; i < nHybridBands; i++) {
            ppDataOut__FDK[ts][i].v.re = ppDataIn__FDK[ts][i].v.re;
            ppDataOut__FDK[ts][i].v.im = ppDataIn__FDK[ts][i].v.im;
          }
        } else {
          for (i = 0; i < nHybridBands; i++) {
            ppDataOut__FDK[ts][i].v.re = fMult(win, ppDataIn__FDK[ts][i].v.re);
            ppDataOut__FDK[ts][i].v.im = fMult(win, ppDataIn__FDK[ts][i].v.im);
          }
        }
      } /* ts */
    }
  }

  return error;
}