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+/* -----------------------------------------------------------------------------
+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):   M. Schug / A. Groeschel
+
+   Description: bandwidth expert
+
+*******************************************************************************/
+
+#include "channel_map.h"
+#include "bandwidth.h"
+#include "aacEnc_ram.h"
+
+typedef struct {
+  INT chanBitRate;
+  INT bandWidthMono;
+  INT bandWidth2AndMoreChan;
+
+} BANDWIDTH_TAB;
+
+static const BANDWIDTH_TAB bandWidthTable[] = {
+    {0, 3700, 5000},       {12000, 5000, 6400},   {20000, 6900, 9640},
+    {28000, 9600, 13050},  {40000, 12060, 14260}, {56000, 13950, 15500},
+    {72000, 14200, 16120}, {96000, 17000, 17000}, {576001, 17000, 17000}};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_22050[] = {
+    {8000, 2000, 2400},    {12000, 2500, 2700},   {16000, 3300, 3100},
+    {24000, 6250, 7200},   {32000, 9200, 10500},  {40000, 16000, 16000},
+    {48000, 16000, 16000}, {282241, 16000, 16000}};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_24000[] = {
+    {8000, 2000, 2000},    {12000, 2000, 2300},   {16000, 2200, 2500},
+    {24000, 5650, 7200},   {32000, 11600, 12000}, {40000, 12000, 16000},
+    {48000, 16000, 16000}, {64000, 16000, 16000}, {307201, 16000, 16000}};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_32000[] = {
+    {8000, 2000, 2000},    {12000, 2000, 2000},   {24000, 4250, 7200},
+    {32000, 8400, 9000},   {40000, 9400, 11300},  {48000, 11900, 14700},
+    {64000, 14800, 16000}, {76000, 16000, 16000}, {409601, 16000, 16000}};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_44100[] = {
+    {8000, 2000, 2000},     {24000, 2000, 2000},   {32000, 4400, 5700},
+    {40000, 7400, 8800},    {48000, 9000, 10700},  {56000, 11000, 12900},
+    {64000, 14400, 15500},  {80000, 16000, 16200}, {96000, 16500, 16000},
+    {128000, 16000, 16000}, {564481, 16000, 16000}};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_48000[] = {
+    {8000, 2000, 2000},     {24000, 2000, 2000},   {32000, 4400, 5700},
+    {40000, 7400, 8800},    {48000, 9000, 10700},  {56000, 11000, 12800},
+    {64000, 14300, 15400},  {80000, 16000, 16200}, {96000, 16500, 16000},
+    {128000, 16000, 16000}, {614401, 16000, 16000}};
+
+typedef struct {
+  AACENC_BITRATE_MODE bitrateMode;
+  int bandWidthMono;
+  int bandWidth2AndMoreChan;
+} BANDWIDTH_TAB_VBR;
+
+static const BANDWIDTH_TAB_VBR bandWidthTableVBR[] = {
+    {AACENC_BR_MODE_CBR, 0, 0},
+    {AACENC_BR_MODE_VBR_1, 13050, 13050},
+    {AACENC_BR_MODE_VBR_2, 13050, 13050},
+    {AACENC_BR_MODE_VBR_3, 14260, 14260},
+    {AACENC_BR_MODE_VBR_4, 15500, 15500},
+    {AACENC_BR_MODE_VBR_5, 48000, 48000},
+    {AACENC_BR_MODE_SFR, 0, 0},
+    {AACENC_BR_MODE_FF, 0, 0}
+
+};
+
+static INT GetBandwidthEntry(const INT frameLength, const INT sampleRate,
+                             const INT chanBitRate, const INT entryNo) {
+  INT bandwidth = -1;
+  const BANDWIDTH_TAB *pBwTab = NULL;
+  INT bwTabSize = 0;
+
+  switch (frameLength) {
+    case 960:
+    case 1024:
+      pBwTab = bandWidthTable;
+      bwTabSize = sizeof(bandWidthTable) / sizeof(BANDWIDTH_TAB);
+      break;
+    case 120:
+    case 128:
+    case 240:
+    case 256:
+    case 480:
+    case 512:
+      switch (sampleRate) {
+        case 8000:
+        case 11025:
+        case 12000:
+        case 16000:
+        case 22050:
+          pBwTab = bandWidthTable_LD_22050;
+          bwTabSize = sizeof(bandWidthTable_LD_22050) / sizeof(BANDWIDTH_TAB);
+          break;
+        case 24000:
+          pBwTab = bandWidthTable_LD_24000;
+          bwTabSize = sizeof(bandWidthTable_LD_24000) / sizeof(BANDWIDTH_TAB);
+          break;
+        case 32000:
+          pBwTab = bandWidthTable_LD_32000;
+          bwTabSize = sizeof(bandWidthTable_LD_32000) / sizeof(BANDWIDTH_TAB);
+          break;
+        case 44100:
+          pBwTab = bandWidthTable_LD_44100;
+          bwTabSize = sizeof(bandWidthTable_LD_44100) / sizeof(BANDWIDTH_TAB);
+          break;
+        case 48000:
+        case 64000:
+        case 88200:
+        case 96000:
+          pBwTab = bandWidthTable_LD_48000;
+          bwTabSize = sizeof(bandWidthTable_LD_48000) / sizeof(BANDWIDTH_TAB);
+          break;
+      }
+      break;
+    default:
+      pBwTab = NULL;
+      bwTabSize = 0;
+  }
+
+  if (pBwTab != NULL) {
+    int i;
+    for (i = 0; i < bwTabSize - 1; i++) {
+      if (chanBitRate >= pBwTab[i].chanBitRate &&
+          chanBitRate < pBwTab[i + 1].chanBitRate) {
+        switch (frameLength) {
+          case 960:
+          case 1024:
+            bandwidth = (entryNo == 0) ? pBwTab[i].bandWidthMono
+                                       : pBwTab[i].bandWidth2AndMoreChan;
+            break;
+          case 120:
+          case 128:
+          case 240:
+          case 256:
+          case 480:
+          case 512: {
+            INT q_res = 0;
+            INT startBw = (entryNo == 0) ? pBwTab[i].bandWidthMono
+                                         : pBwTab[i].bandWidth2AndMoreChan;
+            INT endBw = (entryNo == 0) ? pBwTab[i + 1].bandWidthMono
+                                       : pBwTab[i + 1].bandWidth2AndMoreChan;
+            INT startBr = pBwTab[i].chanBitRate;
+            INT endBr = pBwTab[i + 1].chanBitRate;
+
+            FIXP_DBL bwFac_fix =
+                fDivNorm(chanBitRate - startBr, endBr - startBr, &q_res);
+            bandwidth =
+                (INT)scaleValue(fMult(bwFac_fix, (FIXP_DBL)(endBw - startBw)),
+                                q_res) +
+                startBw;
+          } break;
+          default:
+            bandwidth = -1;
+        }
+        break;
+      } /* within bitrate range */
+    }
+  } /* pBwTab!=NULL */
+
+  return bandwidth;
+}
+
+AAC_ENCODER_ERROR FDKaacEnc_DetermineBandWidth(
+    const INT proposedBandWidth, const INT bitrate,
+    const AACENC_BITRATE_MODE bitrateMode, const INT sampleRate,
+    const INT frameLength, const CHANNEL_MAPPING *const cm,
+    const CHANNEL_MODE encoderMode, INT *const bandWidth) {
+  AAC_ENCODER_ERROR ErrorStatus = AAC_ENC_OK;
+  INT chanBitRate = bitrate / cm->nChannelsEff;
+
+  switch (bitrateMode) {
+    case AACENC_BR_MODE_VBR_1:
+    case AACENC_BR_MODE_VBR_2:
+    case AACENC_BR_MODE_VBR_3:
+    case AACENC_BR_MODE_VBR_4:
+    case AACENC_BR_MODE_VBR_5:
+      if (proposedBandWidth != 0) {
+        /* use given bw */
+        *bandWidth = proposedBandWidth;
+      } else {
+        /* take bw from table */
+        switch (encoderMode) {
+          case MODE_1:
+            *bandWidth = bandWidthTableVBR[bitrateMode].bandWidthMono;
+            break;
+          case MODE_2:
+          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:
+            *bandWidth = bandWidthTableVBR[bitrateMode].bandWidth2AndMoreChan;
+            break;
+          default:
+            return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
+        }
+      }
+      break;
+    case AACENC_BR_MODE_CBR:
+    case AACENC_BR_MODE_SFR:
+    case AACENC_BR_MODE_FF:
+
+      /* bandwidth limiting */
+      if (proposedBandWidth != 0) {
+        *bandWidth = fMin(proposedBandWidth, fMin(20000, sampleRate >> 1));
+      } else { /* search reasonable bandwidth */
+
+        int entryNo = 0;
+
+        switch (encoderMode) {
+          case MODE_1:   /* mono      */
+            entryNo = 0; /* use mono bandwidth settings */
+            break;
+
+          case MODE_2:       /* stereo    */
+          case MODE_1_2:     /* sce + cpe */
+          case MODE_1_2_1:   /* sce + cpe + sce */
+          case MODE_1_2_2:   /* sce + cpe + cpe */
+          case MODE_1_2_2_1: /* (5.1) sce + cpe + cpe + lfe */
+          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:
+            entryNo = 1; /* use stereo bandwidth settings */
+            break;
+
+          default:
+            return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
+        }
+
+        *bandWidth =
+            GetBandwidthEntry(frameLength, sampleRate, chanBitRate, entryNo);
+
+        if (*bandWidth == -1) {
+          switch (frameLength) {
+            case 120:
+            case 128:
+            case 240:
+            case 256:
+              *bandWidth = 16000;
+              break;
+            default:
+              ErrorStatus = AAC_ENC_INVALID_CHANNEL_BITRATE;
+          }
+        }
+      }
+      break;
+    default:
+      *bandWidth = 0;
+      return AAC_ENC_UNSUPPORTED_BITRATE_MODE;
+  }
+
+  *bandWidth = fMin(*bandWidth, sampleRate / 2);
+
+  return ErrorStatus;
+}