Include patched FDK-AAC in the repository

The initial idea was to get the DAB+ patch into upstream, but since
that follows the android source releases, there is no place for a custom
DAB+ patch there.

So instead of having to maintain a patched fdk-aac that has to have the
same .so version as the distribution package on which it is installed,
we prefer having a separate fdk-aac-dab library to avoid collision.

At that point, there's no reason to keep fdk-aac in a separate
repository, as odr-audioenc is the only tool that needs DAB+ encoding
support. Including it here simplifies installation, and makes it
consistent with toolame-dab, also shipped in this repository.

DAB+ decoding support (needed by ODR-SourceCompanion, dablin, etisnoop,
welle.io and others) can be done using upstream FDK-AAC.

1 files changed, 664 insertions, 0 deletions

diff --git a/fdk-aac/libAACenc/src/channel_map.cpp b/fdk-aac/libAACenc/src/channel_map.cpp
new file mode 100644
index 0000000..6ee91d5
--- /dev/null
+++ b/fdk-aac/libAACenc/src/channel_map.cpp
@@ -0,0 +1,664 @@
+/* -----------------------------------------------------------------------------
+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
+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
+(www.vialicensing.com) or through the respective patent owners individually for
+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
+Android devices already license these patent claims through Via Licensing or
+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
+licensed purposes only.
+
+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.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+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
+----------------------------------------------------------------------------- */
+
+/**************************** AAC encoder library ******************************
+
+   Author(s):   A. Groeschel
+
+   Description: channel mapping functionality
+
+*******************************************************************************/
+
+#include "channel_map.h"
+#include "bitenc.h"
+#include "psy_const.h"
+#include "qc_data.h"
+#include "aacEnc_ram.h"
+#include "FDK_tools_rom.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)
+*/
+
+/* Channel mode configuration tab provides,
+   corresponding number of channels and elements
+*/
+static const CHANNEL_MODE_CONFIG_TAB channelModeConfig[] = {
+    {MODE_1, 1, 1, 1},             /* chCfg  1, SCE                 */
+    {MODE_2, 2, 2, 1},             /* chCfg  2, CPE                 */
+    {MODE_1_2, 3, 3, 2},           /* chCfg  3, SCE,CPE             */
+    {MODE_1_2_1, 4, 4, 3},         /* chCfg  4, SCE,CPE,SCE         */
+    {MODE_1_2_2, 5, 5, 3},         /* chCfg  5, SCE,CPE,CPE         */
+    {MODE_1_2_2_1, 6, 5, 4},       /* chCfg  6, SCE,CPE,CPE,LFE     */
+    {MODE_1_2_2_2_1, 8, 7, 5},     /* chCfg  7, SCE,CPE,CPE,CPE,LFE */
+    {MODE_6_1, 7, 6, 5},           /* chCfg 11, SCE,CPE,CPE,SCE,LFE */
+    {MODE_7_1_BACK, 8, 7, 5},      /* chCfg 12, SCE,CPE,CPE,CPE,LFE */
+    {MODE_7_1_TOP_FRONT, 8, 7, 5}, /* chCfg 14, SCE,CPE,CPE,LFE,CPE */
+    {MODE_7_1_REAR_SURROUND, 8, 7,
+     5}, /* same as MODE_7_1_BACK,  SCE,CPE,CPE,CPE,LFE */
+    {MODE_7_1_FRONT_CENTER, 8, 7,
+     5}, /* same as MODE_1_2_2_2_1, SCE,CPE,CPE,CPE,LFE */
+
+};
+
+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, FDK_channelMapDescr* mapDescr,
+                                 UINT mapIdx, INT* it_cnt,
+                                 const FIXP_DBL relBits) {
+  INT error = 0;
+  INT counter = *cnt;
+
+  elInfo->elType = elType;
+  elInfo->relativeBits = relBits;
+
+  switch (elInfo->elType) {
+    case ID_SCE:
+    case ID_LFE:
+    case ID_CCE:
+      elInfo->nChannelsInEl = 1;
+      elInfo->ChannelIndex[0] =
+          FDK_chMapDescr_getMapValue(mapDescr, counter++, mapIdx);
+      elInfo->instanceTag = it_cnt[elType]++;
+      break;
+    case ID_CPE:
+      elInfo->nChannelsInEl = 2;
+      elInfo->ChannelIndex[0] =
+          FDK_chMapDescr_getMapValue(mapDescr, counter++, mapIdx);
+      elInfo->ChannelIndex[1] =
+          FDK_chMapDescr_getMapValue(mapDescr, counter++, mapIdx);
+      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;
+  UINT mapIdx;
+  FDK_channelMapDescr mapDescr;
+
+  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 map descriptor */
+  FDK_chMapDescr_init(&mapDescr, NULL, 0, (co == CH_ORDER_MPEG) ? 1 : 0);
+  switch (mode) {
+    case MODE_7_1_REAR_SURROUND: /* MODE_7_1_REAR_SURROUND is equivalent to
+                                    MODE_7_1_BACK */
+      mapIdx = (INT)MODE_7_1_BACK;
+      break;
+    case MODE_7_1_FRONT_CENTER: /* MODE_7_1_FRONT_CENTER is equivalent to
+                                   MODE_1_2_2_2_1 */
+      mapIdx = (INT)MODE_1_2_2_2_1;
+      break;
+    default:
+      mapIdx =
+          (INT)mode > 14
+              ? 0
+              : (INT)
+                    mode; /* if channel config > 14 MPEG mapping will be used */
+  }
+
+  /* init element info struct */
+  switch (mode) {
+    case MODE_1:
+      /* (mono) sce  */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx,
+                            it_cnt, (FIXP_DBL)MAXVAL_DBL);
+      break;
+    case MODE_2:
+      /* (stereo) cpe */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_CPE, &count, &mapDescr, mapIdx,
+                            it_cnt, (FIXP_DBL)MAXVAL_DBL);
+      break;
+
+    case MODE_1_2:
+      /* sce + cpe */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.4f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.6f));
+      break;
+
+    case MODE_1_2_1:
+      /* sce + cpe + sce */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.3f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.4f));
+      FDKaacEnc_initElement(&cm->elInfo[2], ID_SCE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.3f));
+      break;
+
+    case MODE_1_2_2:
+      /* sce + cpe + cpe */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.26f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.37f));
+      FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, &mapDescr, mapIdx,
+                            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, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.24f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.35f));
+      FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.35f));
+      FDKaacEnc_initElement(&cm->elInfo[3], ID_LFE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.06f));
+      break;
+
+    case MODE_6_1:
+      /* (6.1) sce + cpe + cpe + sce + lfe */
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.2f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.275f));
+      FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.275f));
+      FDKaacEnc_initElement(&cm->elInfo[3], ID_SCE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.2f));
+      FDKaacEnc_initElement(&cm->elInfo[4], ID_LFE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.05f));
+      break;
+
+    case MODE_1_2_2_2_1:
+    case MODE_7_1_BACK:
+    case MODE_7_1_TOP_FRONT:
+    case MODE_7_1_REAR_SURROUND:
+    case MODE_7_1_FRONT_CENTER: {
+      /* (7.1) sce + cpe + cpe + cpe + lfe */
+      /* (7.1 top) sce + cpe + cpe + lfe + cpe */
+
+      FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.18f));
+      FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.26f));
+      FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, &mapDescr, mapIdx,
+                            it_cnt, FL2FXCONST_DBL(0.26f));
+      if (mode != MODE_7_1_TOP_FRONT) {
+        FDKaacEnc_initElement(&cm->elInfo[3], ID_CPE, &count, &mapDescr, mapIdx,
+                              it_cnt, FL2FXCONST_DBL(0.26f));
+        FDKaacEnc_initElement(&cm->elInfo[4], ID_LFE, &count, &mapDescr, mapIdx,
+                              it_cnt, FL2FXCONST_DBL(0.04f));
+      } else {
+        FDKaacEnc_initElement(&cm->elInfo[3], ID_LFE, &count, &mapDescr, mapIdx,
+                              it_cnt, FL2FXCONST_DBL(0.04f));
+        FDKaacEnc_initElement(&cm->elInfo[4], ID_CPE, &count, &mapDescr, mapIdx,
+                              it_cnt, FL2FXCONST_DBL(0.26f));
+      }
+      break;
+    }
+
+    default:
+      //*chMap=0;
+      return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
+  };
+
+  FDK_ASSERT(cm->nElements <= ((8)));
+
+  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)fMax(
+          (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_6_1: {
+      /* (6.1) sce + cpe + cpe + sce + lfe */
+      FIXP_DBL sceRate = hQC->elementBits[0]->relativeBitsEl =
+          cm->elInfo[0].relativeBits;
+      FIXP_DBL cpe1Rate = hQC->elementBits[1]->relativeBitsEl =
+          cm->elInfo[1].relativeBits;
+      FIXP_DBL cpe2Rate = hQC->elementBits[2]->relativeBitsEl =
+          cm->elInfo[2].relativeBits;
+      FIXP_DBL sce2Rate = hQC->elementBits[3]->relativeBitsEl =
+          cm->elInfo[3].relativeBits;
+      FIXP_DBL lfeRate = hQC->elementBits[4]->relativeBitsEl =
+          cm->elInfo[4].relativeBits;
+
+      int maxBitsTot =
+          maxChannelBits * 6; /* LFE does not add to bit reservoir */
+      int sc = CountLeadingBits(fixMax(maxChannelBits, averageBitsTot));
+      int maxLfeBits = (int)fMax(
+          (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) / 6;
+
+      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(sce2Rate, (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 = maxChannelBits;
+      hQC->elementBits[4]->maxBitsEl = maxLfeBits;
+      break;
+    }
+    case MODE_7_1_TOP_FRONT:
+    case MODE_7_1_BACK:
+    case MODE_7_1_REAR_SURROUND:
+    case MODE_7_1_FRONT_CENTER:
+    case MODE_1_2_2_2_1: {
+      int cpe3Idx = (cm->encMode != MODE_7_1_TOP_FRONT) ? 3 : 4;
+      int lfeIdx = (cm->encMode != MODE_7_1_TOP_FRONT) ? 4 : 3;
+
+      /* (7.1) sce + cpe + cpe + cpe + lfe */
+      FIXP_DBL sceRate = hQC->elementBits[0]->relativeBitsEl =
+          cm->elInfo[0].relativeBits;
+      FIXP_DBL cpe1Rate = hQC->elementBits[1]->relativeBitsEl =
+          cm->elInfo[1].relativeBits;
+      FIXP_DBL cpe2Rate = hQC->elementBits[2]->relativeBitsEl =
+          cm->elInfo[2].relativeBits;
+      FIXP_DBL cpe3Rate = hQC->elementBits[cpe3Idx]->relativeBitsEl =
+          cm->elInfo[cpe3Idx].relativeBits;
+      FIXP_DBL lfeRate = hQC->elementBits[lfeIdx]->relativeBitsEl =
+          cm->elInfo[lfeIdx].relativeBits;
+
+      int maxBitsTot =
+          maxChannelBits * 7; /* LFE does not add to bit reservoir */
+      int sc = CountLeadingBits(fixMax(maxChannelBits, averageBitsTot));
+      int maxLfeBits = (int)fMax(
+          (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[cpe3Idx]->chBitrateEl =
+          fMult(cpe3Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1);
+      hQC->elementBits[lfeIdx]->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[cpe3Idx]->maxBitsEl = 2 * maxChannelBits;
+      hQC->elementBits[lfeIdx]->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_6_1:
+    case MODE_1_2_2_2_1:
+    case MODE_7_1_REAR_SURROUND:
+    case MODE_7_1_FRONT_CENTER:
+    case MODE_7_1_BACK:
+    case MODE_7_1_TOP_FRONT:
+      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;
+}