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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
+----------------------------------------------------------------------------------------------------------- */
+
+/*****************************  MPEG-4 AAC Decoder  **************************
+
+   Author(s):   Josef Hoepfl
+   Description: individual channel stream info
+
+******************************************************************************/
+
+#include "channelinfo.h"
+#include "aac_rom.h"
+#include "aac_ram.h"
+#include "FDK_bitstream.h"
+
+
+AAC_DECODER_ERROR IcsReadMaxSfb (
+        HANDLE_FDK_BITSTREAM bs,
+        CIcsInfo *pIcsInfo,
+        const SamplingRateInfo *pSamplingRateInfo
+        )
+{
+  AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
+  int nbits;
+
+  if (IsLongBlock(pIcsInfo)) {
+    nbits = 6;
+    pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Long;
+  } else {
+    nbits = 4;
+    pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Short;
+  }
+  pIcsInfo->MaxSfBands = (UCHAR) FDKreadBits(bs, nbits);
+
+  if (pIcsInfo->MaxSfBands > pIcsInfo->TotalSfBands){
+    ErrorStatus = AAC_DEC_PARSE_ERROR;
+  }
+
+  return ErrorStatus;
+}
+
+
+
+AAC_DECODER_ERROR IcsRead(HANDLE_FDK_BITSTREAM bs,
+                          CIcsInfo *pIcsInfo,
+                          const SamplingRateInfo* pSamplingRateInfo,
+                          const UINT flags)
+{
+  AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
+
+  pIcsInfo->Valid = 0;
+
+  if (flags & AC_ELD){
+    pIcsInfo->WindowSequence = OnlyLongSequence;
+    pIcsInfo->WindowShape = 0;
+  }
+  else {
+    if ( !(flags & (AC_USAC|AC_RSVD50)) ) {
+      FDKreadBits(bs,1);
+    }
+    pIcsInfo->WindowSequence = (UCHAR) FDKreadBits(bs,2);
+    pIcsInfo->WindowShape = (UCHAR) FDKreadBits(bs,1);
+    if (flags & AC_LD) {
+      if (pIcsInfo->WindowShape) {
+        pIcsInfo->WindowShape = 2; /* select low overlap instead of KBD */
+      }
+    }
+  }
+
+  /* Sanity check */
+  if ( (flags & (AC_ELD|AC_LD)) && pIcsInfo->WindowSequence != OnlyLongSequence) {
+    pIcsInfo->WindowSequence = OnlyLongSequence;
+    ErrorStatus = AAC_DEC_PARSE_ERROR;
+    goto bail;
+  }
+
+  ErrorStatus = IcsReadMaxSfb(bs, pIcsInfo, pSamplingRateInfo);
+  if (ErrorStatus != AAC_DEC_OK) {
+    goto bail;
+  }
+
+  if (IsLongBlock(pIcsInfo))
+  {
+    if ( !(flags & (AC_ELD|AC_SCALABLE|AC_BSAC|AC_USAC|AC_RSVD50)) ) /* If not ELD nor Scalable nor BSAC nor USAC syntax then ... */
+    {
+      if ((UCHAR)FDKreadBits(bs,1) != 0 ) /* UCHAR PredictorDataPresent */
+      {
+        ErrorStatus = AAC_DEC_UNSUPPORTED_PREDICTION;
+        goto bail;
+      }
+    }
+
+    pIcsInfo->WindowGroups = 1;
+    pIcsInfo->WindowGroupLength[0] = 1;
+  }
+  else
+  {
+    INT i;
+    UINT mask;
+
+    pIcsInfo->ScaleFactorGrouping = (UCHAR) FDKreadBits(bs,7);
+
+    pIcsInfo->WindowGroups = 0 ;
+
+    for (i=0; i < (8-1); i++)
+    {
+      mask = 1 << (6 - i);
+      pIcsInfo->WindowGroupLength[i] = 1;
+
+      if (pIcsInfo->ScaleFactorGrouping & mask)
+      {
+        pIcsInfo->WindowGroupLength[pIcsInfo->WindowGroups]++;
+      }
+      else
+      {
+        pIcsInfo->WindowGroups++;
+      }
+    }
+
+    /* loop runs to i < 7 only */
+    pIcsInfo->WindowGroupLength[8-1] = 1;
+    pIcsInfo->WindowGroups++;
+  }
+
+
+bail:
+  if (ErrorStatus == AAC_DEC_OK)
+    pIcsInfo->Valid = 1;
+
+  return ErrorStatus;
+}
+
+
+/*
+  interleave codebooks the following way
+
+    9 (84w) |  1 (51w)
+   10 (82w) |  2 (39w)
+  SCL (65w) |  4 (38w)
+    3 (39w) |  5 (41w)
+            |  6 (40w)
+            |  7 (31w)
+            |  8 (31w)
+     (270w)     (271w)
+*/
+
+
+/*
+  Table entries are sorted as following:
+  | num_swb_long_window | sfbands_long | num_swb_short_window | sfbands_short |
+*/
+AAC_DECODER_ERROR getSamplingRateInfo(
+        SamplingRateInfo *t,
+        UINT samplesPerFrame,
+        UINT samplingRateIndex,
+        UINT samplingRate
+        )
+{
+  int index = 0;
+
+
+  t->samplingRateIndex = samplingRateIndex;
+  t->samplingRate = samplingRate;
+
+  switch (samplesPerFrame) {
+  case 1024:
+    index = 0;
+    break;
+  case 960:
+    index = 1;
+    break;
+  case 512:
+    index = 3;
+    break;
+  case 480:
+    index = 4;
+    break;
+
+  default:
+    return AAC_DEC_UNSUPPORTED_FORMAT;
+  }
+
+  t->ScaleFactorBands_Long = sfbOffsetTables[index][samplingRateIndex].sfbOffsetLong;
+  t->ScaleFactorBands_Short = sfbOffsetTables[index][samplingRateIndex].sfbOffsetShort;
+  t->NumberOfScaleFactorBands_Long = sfbOffsetTables[index][samplingRateIndex].numberOfSfbLong;
+  t->NumberOfScaleFactorBands_Short = sfbOffsetTables[index][samplingRateIndex].numberOfSfbShort;
+
+  if (t->ScaleFactorBands_Long == NULL || t->NumberOfScaleFactorBands_Long == 0) {
+    return AAC_DEC_UNSUPPORTED_FORMAT;
+  }
+
+  FDK_ASSERT(t->ScaleFactorBands_Long[t->NumberOfScaleFactorBands_Long] == samplesPerFrame);
+  FDK_ASSERT(t->ScaleFactorBands_Short == NULL || t->ScaleFactorBands_Short[t->NumberOfScaleFactorBands_Short]*8 == samplesPerFrame);
+
+  return AAC_DEC_OK;
+}