Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 499 insertions, 0 deletions

diff --git a/libAACenc/src/channel_map.cpp b/libAACenc/src/channel_map.cpp
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+/*************************  Fast MPEG AAC Audio Encoder  **********************
+
+                     (C) Copyright Fraunhofer IIS (2000)
+                               All Rights Reserved
+
+    Please be advised that this software and/or program delivery is
+    Confidential Information of Fraunhofer and subject to and covered by the
+
+    Fraunhofer IIS Software Evaluation Agreement
+    between Google Inc. and  Fraunhofer
+    effective and in full force since March 1, 2012.
+
+    You may use this software and/or program only under the terms and
+    conditions described in the above mentioned Fraunhofer IIS Software
+    Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+   This software and/or program is protected by copyright law and international
+   treaties. Any reproduction or distribution of this software and/or program,
+   or any portion of it, may result in severe civil and criminal penalties, and
+   will be prosecuted to the maximum extent possible under law.
+
+   $Id$
+   Initial author:       A. Groeschel
+   contents/description: channel mapping functionality
+
+******************************************************************************/
+
+#include "channel_map.h"
+#include "bitenc.h"
+#include "psy_const.h"
+#include "qc_data.h"
+#include "aacEnc_ram.h"
+
+
+/* channel_assignment treats the relationship of Input file channels
+   to the encoder channels.
+   This is necessary because the usual order in RIFF files (.wav)
+   is different from the elements order in the coder given
+   by Table 8.1 (implicit speaker mapping) of the AAC standard.
+
+   In mono and stereo case, this is trivial.
+   In mc case, it looks like this:
+
+   Channel         Input file       coder chan
+5ch:
+   front center    2                0 (SCE channel)
+   left center     0                1 (1st of 1st CPE)
+   right center    1                2 (2nd of 1st CPE)
+   left surround   3                3 (1st of 2nd CPE)
+   right surround  4                4 (2nd of 2nd CPE)
+
+5.1ch:
+   front center    2                0 (SCE channel)
+   left center     0                1 (1st of 1st CPE)
+   right center    1                2 (2nd of 1st CPE)
+   left surround   4                3 (1st of 2nd CPE)
+   right surround  5                4 (2nd of 2nd CPE)
+   LFE             3                5 (LFE)
+*/
+
+typedef struct {
+
+  CHANNEL_MODE  encoderMode;
+  INT           channel_assignment[/*(6)*/12];
+
+} CHANNEL_ASSIGNMENT_INFO_TAB;
+
+
+static const CHANNEL_ASSIGNMENT_INFO_TAB assignmentInfoTabMpeg[] =
+{
+     { MODE_INVALID,                 {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  invalid   */
+     { MODE_1,                       { 0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  mono      */
+     { MODE_2,                       { 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  stereo    */
+     { MODE_1_2,                     { 0, 1, 2,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  3ch       */
+     { MODE_1_2_1,                   { 0, 1, 2, 3,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  4ch       */
+     { MODE_1_2_2,                   { 0, 1, 2, 3, 4,-1,-1,-1,-1,-1,-1,-1} },  /*  5ch       */
+     { MODE_1_2_2_1,                 { 0, 1, 2, 3, 4, 5,-1,-1,-1,-1,-1,-1} },  /*  5.1ch     */
+     { MODE_1_2_2_2_1,               { 0, 1, 2, 3, 4, 5, 6, 7,-1,-1,-1,-1} },  /*  7.1ch     */
+};
+
+static const CHANNEL_ASSIGNMENT_INFO_TAB assignmentInfoTabWav[] =
+{
+     { MODE_INVALID,                 {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  invalid   */
+     { MODE_1,                       { 0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  mono      */
+     { MODE_2,                       { 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  stereo    */
+     { MODE_1_2,                     { 2, 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  3ch       */
+     { MODE_1_2_1,                   { 2, 0, 1, 3,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  4ch       */
+     { MODE_1_2_2,                   { 2, 0, 1, 3, 4,-1,-1,-1,-1,-1,-1,-1} },  /*  5ch       */
+     { MODE_1_2_2_1,                 { 2, 0, 1, 4, 5, 3,-1,-1,-1,-1,-1,-1} },  /*  5.1ch     */
+     { MODE_1_2_2_2_1,               { 2, 0, 1, 6, 7, 4, 5, 3,-1,-1,-1,-1} },  /*  7.1ch     */
+};
+
+/* Channel mode configuration tab provides,
+   corresponding number of channels and elements
+*/
+static const CHANNEL_MODE_CONFIG_TAB channelModeConfig[] =
+{
+   { MODE_1,                        1,  1,  1 },   /* SCE                 */
+   { MODE_2,                        2,  2,  1 },   /* CPE                 */
+   { MODE_1_2,                      3,  3,  2 },   /* SCE,CPE             */
+   { MODE_1_2_1,                    4,  4,  3 },   /* SCE,CPE,SCE         */
+   { MODE_1_2_2,                    5,  5,  3 },   /* SCE,CPE,CPE         */
+   { MODE_1_2_2_1,                  6,  5,  4 },   /* SCE,CPE,CPE,LFE     */
+   { MODE_1_2_2_2_1,                8,  7,  5 },   /* SCE,CPE,CPE,CPE,LFE */
+};
+
+#define MAX_MODES (sizeof(assignmentInfoTabWav)/sizeof(CHANNEL_ASSIGNMENT_INFO_TAB))
+
+const INT* FDKaacEnc_getChannelAssignment(CHANNEL_MODE encMode, CHANNEL_ORDER co)
+{
+  const CHANNEL_ASSIGNMENT_INFO_TAB *pTab;
+  int i;
+
+  if (co == CH_ORDER_MPEG)
+    pTab = assignmentInfoTabMpeg;
+  else
+    pTab = assignmentInfoTabWav;
+
+  for(i=MAX_MODES-1; i>0; i--) {
+    if (encMode== pTab[i].encoderMode) {
+      break;
+    }
+  }
+  return (pTab[i].channel_assignment);
+}
+
+AAC_ENCODER_ERROR FDKaacEnc_DetermineEncoderMode(CHANNEL_MODE* mode, INT nChannels)
+{
+  INT i;
+  CHANNEL_MODE encMode = MODE_INVALID;
+
+  if (*mode==MODE_UNKNOWN) {
+    for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) {
+      if (channelModeConfig[i].nChannels==nChannels) {
+          encMode = channelModeConfig[i].encMode;
+          break;
+      }
+    }
+    *mode = encMode;
+  }
+  else {
+    /* check if valid channel configuration */
+    if (FDKaacEnc_GetChannelModeConfiguration(*mode)->nChannels==nChannels) {
+        encMode = *mode;
+    }
+  }
+
+  if (encMode==MODE_INVALID) {
+    return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
+  }
+
+  return AAC_ENC_OK;
+}
+
+static INT FDKaacEnc_initElement (ELEMENT_INFO* elInfo, MP4_ELEMENT_ID elType, INT* cnt, CHANNEL_MODE mode, CHANNEL_ORDER co, INT* it_cnt, const FIXP_DBL relBits) {
+
+  INT error=0;
+  INT counter =*cnt;
+
+  const INT *assign = FDKaacEnc_getChannelAssignment(mode, co);
+
+  elInfo->elType=elType;
+  elInfo->relativeBits = relBits;
+
+  switch(elInfo->elType) {
+  case ID_SCE: case ID_LFE: case ID_CCE:
+    elInfo->nChannelsInEl=1;
+    elInfo->ChannelIndex[0]=assign[counter++];
+    elInfo->instanceTag=it_cnt[elType]++;
+
+    break;
+  case ID_CPE:
+    elInfo->nChannelsInEl=2;
+    elInfo->ChannelIndex[0]=assign[counter++];
+    elInfo->ChannelIndex[1]=assign[counter++];
+    elInfo->instanceTag=it_cnt[elType]++;
+    break;
+  case ID_DSE:
+    elInfo->nChannelsInEl=0;
+    elInfo->ChannelIndex[0]=0;
+    elInfo->ChannelIndex[1]=0;
+    elInfo->instanceTag=it_cnt[elType]++;
+    break;
+  default: error=1;
+  };
+  *cnt = counter;
+  return error;
+
+}
+
+AAC_ENCODER_ERROR FDKaacEnc_InitChannelMapping(CHANNEL_MODE mode, CHANNEL_ORDER co, CHANNEL_MAPPING* cm)
+{
+  INT count=0; /* count through coder channels */
+  INT it_cnt[ID_END+1];
+  INT i;
+
+  for (i=0; i<ID_END; i++)
+    it_cnt[i]=0;
+
+  FDKmemclear(cm, sizeof(CHANNEL_MAPPING));
+
+  /* init channel mapping*/
+  for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) {
+    if (channelModeConfig[i].encMode==mode)
+    {
+        cm->encMode      = channelModeConfig[i].encMode;
+        cm->nChannels    = channelModeConfig[i].nChannels;
+        cm->nChannelsEff = channelModeConfig[i].nChannelsEff;
+        cm->nElements    = channelModeConfig[i].nElements;
+
+        break;
+    }
+  }
+
+  /* init element info struct */
+  switch(mode) {
+    case MODE_1:
+      /* (mono) sce  */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, (FIXP_DBL)MAXVAL_DBL);
+      break;
+    case MODE_2:
+      /* (stereo) cpe */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_CPE, &count, mode, co, it_cnt, (FIXP_DBL)MAXVAL_DBL);
+      break;
+
+    case MODE_1_2:
+      /* sce + cpe */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.4f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.6f));
+      break;
+
+    case MODE_1_2_1:
+      /* sce + cpe + sce */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.3f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.4f));
+      FDKaacEnc_initElement(&cm->elInfo[2], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.3f));
+      break;
+
+    case MODE_1_2_2:
+      /* sce + cpe + cpe */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.37f));
+      FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.37f));
+      break;
+
+    case MODE_1_2_2_1:
+      /* (5.1) sce + cpe + cpe + lfe */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.24f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.35f));
+      FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.35f));
+      FDKaacEnc_initElement(&cm->elInfo[3], ID_LFE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.06f));
+      break;
+
+    case MODE_1_2_2_2_1:
+      /* (7.1) sce + cpe + cpe + cpe + lfe */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.18f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
+      FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
+      FDKaacEnc_initElement(&cm->elInfo[3], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
+      FDKaacEnc_initElement(&cm->elInfo[4], ID_LFE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.04f));
+      break;
+
+    default:
+      //*chMap=0;
+      return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
+  };
+
+  /* Prevent additional element and save memory for unused PSY_OUT_ELEMENT,
+     ATS_ELEMENT, QC_OUT_ELEMENT ...
+     DSE signalling is done via elDSE flag.
+  */
+//  if (dseFlag == 1) {
+//    it_cnt[ID_DSE]++;          /* increment DSE */
+//  }
+//  cm->elDSE = it_cnt[ID_DSE];  /* save number of DSE elemts */
+
+  FDK_ASSERT(cm->nElements<=(6));
+
+  //*chMap = cm;
+
+  return AAC_ENC_OK;
+}
+
+AAC_ENCODER_ERROR FDKaacEnc_InitElementBits(QC_STATE *hQC,
+                    CHANNEL_MAPPING *cm,
+                    INT bitrateTot,
+                    INT averageBitsTot,
+                    INT maxChannelBits)
+{
+  int sc_brTot = CountLeadingBits(bitrateTot);
+
+  switch(cm->encMode) {
+  case MODE_1:
+    hQC->elementBits[0]->chBitrateEl      = bitrateTot;
+
+    hQC->elementBits[0]->maxBitsEl        = maxChannelBits;
+
+    hQC->elementBits[0]->relativeBitsEl   = cm->elInfo[0].relativeBits;
+    break;
+
+  case MODE_2:
+    hQC->elementBits[0]->chBitrateEl      = bitrateTot>>1;
+
+    hQC->elementBits[0]->maxBitsEl        = 2*maxChannelBits;
+
+    hQC->elementBits[0]->relativeBitsEl   = cm->elInfo[0].relativeBits;
+    break;
+  case MODE_1_2: {
+    hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
+    hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
+    FIXP_DBL sceRate = cm->elInfo[0].relativeBits;
+    FIXP_DBL cpeRate = cm->elInfo[1].relativeBits;
+
+    hQC->elementBits[0]->chBitrateEl      = fMult(sceRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
+    hQC->elementBits[1]->chBitrateEl      = fMult(cpeRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
+
+    hQC->elementBits[0]->maxBitsEl        = maxChannelBits;
+    hQC->elementBits[1]->maxBitsEl        = 2*maxChannelBits;
+    break;
+  }
+  case MODE_1_2_1: {
+    /* sce + cpe + sce */
+    hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
+    hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
+    hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
+    FIXP_DBL sce1Rate = cm->elInfo[0].relativeBits;
+    FIXP_DBL cpeRate  = cm->elInfo[1].relativeBits;
+    FIXP_DBL sce2Rate = cm->elInfo[2].relativeBits;
+
+    hQC->elementBits[0]->chBitrateEl      = fMult(sce1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
+    hQC->elementBits[1]->chBitrateEl      = fMult(cpeRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
+    hQC->elementBits[2]->chBitrateEl      = fMult(sce2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
+
+    hQC->elementBits[0]->maxBitsEl        = maxChannelBits;
+    hQC->elementBits[1]->maxBitsEl        = 2*maxChannelBits;
+    hQC->elementBits[2]->maxBitsEl        = maxChannelBits;
+    break;
+  }
+  case MODE_1_2_2: {
+    /* sce + cpe + cpe */
+    hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
+    hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
+    hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
+    FIXP_DBL sceRate  = cm->elInfo[0].relativeBits;
+    FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits;
+    FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits;
+
+    hQC->elementBits[0]->chBitrateEl      = fMult(sceRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
+    hQC->elementBits[1]->chBitrateEl      = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
+    hQC->elementBits[2]->chBitrateEl      = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
+
+    hQC->elementBits[0]->maxBitsEl        = maxChannelBits;
+    hQC->elementBits[1]->maxBitsEl        = 2*maxChannelBits;
+    hQC->elementBits[2]->maxBitsEl        = 2*maxChannelBits;
+    break;
+  }
+
+  case MODE_1_2_2_1: {
+    /* (5.1) sce + cpe + cpe + lfe */
+    hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
+    hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
+    hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
+    hQC->elementBits[3]->relativeBitsEl = cm->elInfo[3].relativeBits;
+    FIXP_DBL sceRate  = cm->elInfo[0].relativeBits;
+    FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits;
+    FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits;
+    FIXP_DBL lfeRate  = cm->elInfo[3].relativeBits;
+
+    int maxBitsTot = maxChannelBits * 5; /* LFE does not add to bit reservoir */
+    int sc = CountLeadingBits(fixMax(maxChannelBits,averageBitsTot));
+    int maxLfeBits = (int) FDKmax ( (INT)((fMult(lfeRate,(FIXP_DBL)(maxChannelBits<<sc))>>sc)<<1),
+                                    (INT)((fMult(FL2FXCONST_DBL(1.1f/2.f),fMult(lfeRate,(FIXP_DBL)(averageBitsTot<<sc)))<<1)>>sc) );
+
+    maxChannelBits = (maxBitsTot - maxLfeBits);
+    sc = CountLeadingBits(maxChannelBits);
+
+    maxChannelBits = fMult((FIXP_DBL)maxChannelBits<<sc,GetInvInt(5))>>sc;
+
+    hQC->elementBits[0]->chBitrateEl      = fMult(sceRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
+    hQC->elementBits[1]->chBitrateEl      = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
+    hQC->elementBits[2]->chBitrateEl      = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
+    hQC->elementBits[3]->chBitrateEl      = fMult(lfeRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
+
+    hQC->elementBits[0]->maxBitsEl        = maxChannelBits;
+    hQC->elementBits[1]->maxBitsEl        = 2*maxChannelBits;
+    hQC->elementBits[2]->maxBitsEl        = 2*maxChannelBits;
+    hQC->elementBits[3]->maxBitsEl        = maxLfeBits;
+
+    break;
+  }
+
+  case MODE_1_2_2_2_1:{
+      /* (7.1) sce + cpe + cpe + cpe + lfe */
+    hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
+    hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
+    hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
+    hQC->elementBits[3]->relativeBitsEl = cm->elInfo[3].relativeBits;
+    hQC->elementBits[4]->relativeBitsEl = cm->elInfo[4].relativeBits;
+    FIXP_DBL sceRate  = cm->elInfo[0].relativeBits;
+    FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits;
+    FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits;
+    FIXP_DBL cpe3Rate = cm->elInfo[3].relativeBits;
+    FIXP_DBL lfeRate  = cm->elInfo[4].relativeBits;
+
+    int maxBitsTot = maxChannelBits * 7; /* LFE does not add to bit reservoir */
+    int sc = CountLeadingBits(fixMax(maxChannelBits,averageBitsTot));
+    int maxLfeBits = (int) FDKmax ( (INT)((fMult(lfeRate,(FIXP_DBL)(maxChannelBits<<sc))>>sc)<<1),
+                                    (INT)((fMult(FL2FXCONST_DBL(1.1f/2.f),fMult(lfeRate,(FIXP_DBL)(averageBitsTot<<sc)))<<1)>>sc) );
+
+    maxChannelBits = (maxBitsTot - maxLfeBits) / 7;
+
+    hQC->elementBits[0]->chBitrateEl = fMult(sceRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
+    hQC->elementBits[1]->chBitrateEl = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
+    hQC->elementBits[2]->chBitrateEl = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
+    hQC->elementBits[3]->chBitrateEl = fMult(cpe3Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
+    hQC->elementBits[4]->chBitrateEl = fMult(lfeRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
+
+    hQC->elementBits[0]->maxBitsEl = maxChannelBits;
+    hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits;
+    hQC->elementBits[2]->maxBitsEl = 2*maxChannelBits;
+    hQC->elementBits[3]->maxBitsEl = 2*maxChannelBits;
+    hQC->elementBits[4]->maxBitsEl = maxLfeBits;
+    break;
+  }
+
+  default:
+    return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
+  }
+
+  return AAC_ENC_OK;
+}
+
+/********************************************************************************/
+/*                                                                              */
+/* function:    GetMonoStereoMODE(const CHANNEL_MODE mode)                      */
+/*                                                                              */
+/* description: Determines encoder setting from channel mode.                   */
+/*              Multichannel modes are mapped to mono or stereo modes           */
+/*              returns MODE_MONO in case of mono,                           */
+/*                      MODE_STEREO in case of stereo                        */
+/*                      MODE_INVALID in case of error                        */
+/*                                                                              */
+/* input:       CHANNEL_MODE mode: Encoder mode (see qc_data.h).                */
+/* output:      return: CM_STEREO_MODE monoStereoSetting                        */
+/*              (MODE_INVALID: error,                                        */
+/*               MODE_MONO:    mono                                          */
+/*               MODE_STEREO:  stereo).                                      */
+/*                                                                              */
+/* misc:        No memory is allocated.                                         */
+/*                                                                              */
+/********************************************************************************/
+
+ELEMENT_MODE FDKaacEnc_GetMonoStereoMode(const CHANNEL_MODE mode){
+
+  ELEMENT_MODE monoStereoSetting = EL_MODE_INVALID;
+
+  switch(mode){
+  case MODE_1:        /* mono setups */
+    monoStereoSetting = EL_MODE_MONO;
+    break;
+  case MODE_2:        /* stereo setups */
+  case MODE_1_2:
+  case MODE_1_2_1:
+  case MODE_1_2_2:
+  case MODE_1_2_2_1:
+  case MODE_1_2_2_2_1:
+    monoStereoSetting = EL_MODE_STEREO;
+    break;
+  default:            /* error */
+    monoStereoSetting = EL_MODE_INVALID;
+    break;
+  }
+
+  return monoStereoSetting;
+}
+
+const CHANNEL_MODE_CONFIG_TAB* FDKaacEnc_GetChannelModeConfiguration(const CHANNEL_MODE mode)
+{
+  INT i;
+  const CHANNEL_MODE_CONFIG_TAB *cm_config = NULL;
+
+  /* get channel mode config */
+  for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) {
+    if (channelModeConfig[i].encMode==mode)
+    {
+        cm_config = &channelModeConfig[i];
+        break;
+    }
+  }
+  return cm_config;
+}
+
+/*
+void FDKaacEnc_CloseChannelMapping (CHANNEL_MAPPING** phchMap) {
+	FreeRam_ChannelMapping(phchMap);
+}
+*/
+