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+
+/* -----------------------------------------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2012 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
+----------------------------------------------------------------------------------------------------------- */
+
+/*************************  Fast MPEG AAC Audio Encoder  **********************
+
+   Initial author:       M. Schug / A. Groeschel
+   contents/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},
+  {360001, 16000, 16000}
+};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_24000[] = {
+  { 8000,  2000,  2000},
+  {12000,  2000,  2300},
+  {16000,  2200,  2500},
+  {24000,  5650,  6400},
+  {32000,  11600, 12000},
+  {40000,  12000, 16000},
+  {48000,  16000, 16000},
+  {64000,  16000, 16000},
+  {360001, 16000, 16000}
+};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_32000[] = {
+  { 8000,  2000,  2000},
+  {12000,  2000,  2000},
+  {24000,  4250,  5200},
+  {32000,  8400,  9000},
+  {40000,  9400,  11300},
+  {48000,  11900, 13700},
+  {64000,  14800, 16000},
+  {76000,  16000, 16000},
+  {360001, 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},
+  {360001, 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},
+  {360001, 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 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 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(INT* bandWidth,
+                                               INT proposedBandWidth,
+                                               INT bitrate,
+                                               AACENC_BITRATE_MODE bitrateMode,
+                                               INT sampleRate,
+                                               INT frameLength,
+                                               CHANNEL_MAPPING* cm,
+                                               CHANNEL_MODE encoderMode)
+{
+  AAC_ENCODER_ERROR ErrorStatus = AAC_ENC_OK;
+  INT chanBitRate = bitrate/cm->nChannels;
+
+  /* vbr */
+  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_1_2_2_2_1:
+        *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 = FDKmin(proposedBandWidth, FDKmin(20000, sampleRate>>1));
+    }
+    else { /* search reasonable bandwidth */
+
+      int entryNo = 0;
+
+      switch(encoderMode){
+      case MODE_1:        /* mono      */
+        entryNo = 0;      /* use mono bandwith 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_1_2_2_2_1: /* (7.1) sce + cpe + cpe + cpe + lfe */
+        entryNo = 1;      /* use stereo bandwith settings */
+        break;
+
+      default:
+        return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
+      }
+
+      *bandWidth = GetBandwidthEntry(
+            frameLength,
+            sampleRate,
+            chanBitRate,
+            entryNo);
+
+      if (*bandWidth==-1) {
+        ErrorStatus = AAC_ENC_INVALID_CHANNEL_BITRATE;
+      }
+    }
+    break;
+  default:
+    *bandWidth = 0;
+    return AAC_ENC_UNSUPPORTED_BITRATE_MODE;
+  }
+
+  *bandWidth = FDKmin(*bandWidth, sampleRate/2);
+
+  return ErrorStatus;;
+}