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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):   Daniel Homm
+   Description:
+
+******************************************************************************/
+
+#include "tpdec_latm.h"
+
+
+#include "FDK_bitstream.h"
+
+
+#define TPDEC_TRACKINDEX(p,l) (2*(p) + (l))
+
+static
+UINT CLatmDemux_GetValue(HANDLE_FDK_BITSTREAM bs)
+{
+  UCHAR bytesForValue = 0, tmp = 0;
+  int value = 0;
+
+  bytesForValue = (UCHAR) FDKreadBits(bs,2);
+
+  for (UINT i=0; i<=bytesForValue; i++) {
+    value <<= 8;
+    tmp = (UCHAR) FDKreadBits(bs,8);
+    value += tmp;
+  }
+
+  return value;
+}
+
+
+static
+TRANSPORTDEC_ERROR CLatmDemux_ReadAudioMuxElement(
+        HANDLE_FDK_BITSTREAM bs,
+        CLatmDemux *pLatmDemux,
+        int m_muxConfigPresent,
+        CSTpCallBacks *pTpDecCallbacks,
+        CSAudioSpecificConfig *pAsc
+        )
+{
+  TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
+
+  if (m_muxConfigPresent) {
+    pLatmDemux->m_useSameStreamMux = FDKreadBits(bs,1);
+
+    if (!pLatmDemux->m_useSameStreamMux) {
+      if ((ErrorStatus = CLatmDemux_ReadStreamMuxConfig(bs, pLatmDemux, pTpDecCallbacks, pAsc))) {
+        return (ErrorStatus);
+      }
+    }
+  }
+
+  if (pLatmDemux->m_AudioMuxVersionA == 0) {
+    /* Do only once per call, because parsing and decoding is done in-line. */
+    if ((ErrorStatus = CLatmDemux_ReadPayloadLengthInfo(bs,pLatmDemux))) {
+      return (ErrorStatus);
+    }
+  } else {
+    /* audioMuxVersionA > 0 is reserved for future extensions */
+    ErrorStatus = TRANSPORTDEC_UNSUPPORTED_FORMAT;
+  }
+
+  return (ErrorStatus);
+}
+
+TRANSPORTDEC_ERROR CLatmDemux_Read(
+        HANDLE_FDK_BITSTREAM bs,
+        CLatmDemux *pLatmDemux,
+        TRANSPORT_TYPE tt,
+        CSTpCallBacks *pTpDecCallbacks,
+        CSAudioSpecificConfig *pAsc,
+        const INT ignoreBufferFullness
+        )
+{
+  UINT cntBits;
+  UINT cmpBufferFullness;
+  UINT audioMuxLengthBytesLast = 0;
+  TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
+
+  cntBits = FDKgetValidBits(bs);
+
+  if ((INT)cntBits < MIN_LATM_HEADERLENGTH) {
+    return TRANSPORTDEC_NOT_ENOUGH_BITS;
+  }
+
+  if ((ErrorStatus = CLatmDemux_ReadAudioMuxElement(bs, pLatmDemux, (tt != TT_MP4_LATM_MCP0), pTpDecCallbacks, pAsc)))
+    return (ErrorStatus);
+
+  if (!ignoreBufferFullness)
+  {
+    cmpBufferFullness =   24+audioMuxLengthBytesLast*8
+                        + pLatmDemux->m_linfo[0][0].m_bufferFullness* pAsc[TPDEC_TRACKINDEX(0,0)].m_channelConfiguration*32;
+
+    /* evaluate buffer fullness */
+
+    if (pLatmDemux->m_linfo[0][0].m_bufferFullness != 0xFF)
+    {
+      if (!pLatmDemux->BufferFullnessAchieved)
+      {
+        if (cntBits < cmpBufferFullness)
+        {
+          /* condition for start of decoding is not fulfilled */
+
+          /* the current frame will not be decoded */
+          return TRANSPORTDEC_NOT_ENOUGH_BITS;
+        }
+        else
+        {
+          pLatmDemux->BufferFullnessAchieved = 1;
+        }
+      }
+    }
+  }
+
+  return (ErrorStatus);
+}
+
+
+TRANSPORTDEC_ERROR CLatmDemux_ReadStreamMuxConfig(
+        HANDLE_FDK_BITSTREAM bs,
+        CLatmDemux *pLatmDemux,
+        CSTpCallBacks *pTpDecCallbacks,
+        CSAudioSpecificConfig *pAsc
+        )
+{
+  LATM_LAYER_INFO *p_linfo = NULL;
+  TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
+
+  pLatmDemux->m_AudioMuxVersion = FDKreadBits(bs,1);
+
+  if (pLatmDemux->m_AudioMuxVersion == 0) {
+    pLatmDemux->m_AudioMuxVersionA = 0;
+  } else {
+    pLatmDemux->m_AudioMuxVersionA = FDKreadBits(bs,1);
+  }
+
+  if (pLatmDemux->m_AudioMuxVersionA == 0) {
+    if (pLatmDemux->m_AudioMuxVersion == 1) {
+      pLatmDemux->m_taraBufferFullness = CLatmDemux_GetValue(bs);
+    }
+    pLatmDemux->m_allStreamsSameTimeFraming = FDKreadBits(bs,1);
+    pLatmDemux->m_noSubFrames = FDKreadBits(bs,6) + 1;
+    pLatmDemux->m_numProgram  = FDKreadBits(bs,4) + 1;
+
+    if (pLatmDemux->m_numProgram > 1) {
+      return TRANSPORTDEC_UNSUPPORTED_FORMAT;
+    }
+
+    int idCnt = 0;
+    for (UINT prog = 0; prog < pLatmDemux->m_numProgram; prog++) {
+      pLatmDemux->m_numLayer = FDKreadBits(bs,3) + 1;
+      if (pLatmDemux->m_numLayer > 2) {
+        return TRANSPORTDEC_UNSUPPORTED_FORMAT;
+      }
+
+      for (UINT lay = 0; lay < pLatmDemux->m_numLayer; lay++) {
+        p_linfo = &pLatmDemux->m_linfo[prog][lay];
+
+        p_linfo->m_streamID = idCnt++;
+        p_linfo->m_frameLengthInBits = 0;
+
+        if( (prog == 0) && (lay == 0) ) {
+          pLatmDemux->m_useSameConfig = 0;
+        } else {
+          pLatmDemux->m_useSameConfig = FDKreadBits(bs,1);
+        }
+
+        if (pLatmDemux->m_useSameConfig) {
+          if (lay > 1) {
+            FDKmemcpy(&pAsc[TPDEC_TRACKINDEX(prog,lay)], &pAsc[TPDEC_TRACKINDEX(prog,lay-1)], sizeof(CSAudioSpecificConfig));
+          } else {
+            return TRANSPORTDEC_PARSE_ERROR;
+          }
+        } else {
+          if (pLatmDemux->m_AudioMuxVersion == 1)
+          {
+            FDK_BITSTREAM tmpBs;
+            UINT ascStartPos, ascLen=0;
+
+            ascLen = CLatmDemux_GetValue(bs);
+            ascStartPos = FDKgetValidBits(bs);
+            tmpBs = *bs;
+            FDKsyncCache(&tmpBs);
+            tmpBs.hBitBuf.ValidBits = ascLen;
+            
+            /* Read ASC */
+            if ((ErrorStatus = AudioSpecificConfig_Parse(&pAsc[TPDEC_TRACKINDEX(prog,lay)], &tmpBs, 1, pTpDecCallbacks))) {
+              return (ErrorStatus);
+            }
+
+            /* The field p_linfo->m_ascLen could be wrong, so check if */
+            if ( 0 > (INT)FDKgetValidBits(&tmpBs)) {
+              return TRANSPORTDEC_PARSE_ERROR;
+            }
+            FDKpushFor(bs, ascLen); /* position bitstream after ASC */
+          }
+          else {
+            /* Read ASC */
+            if ((ErrorStatus = AudioSpecificConfig_Parse(&pAsc[TPDEC_TRACKINDEX(prog,lay)], bs, 0, pTpDecCallbacks))) {
+              return (ErrorStatus);
+            }
+          }
+          {
+            int cbError;
+
+            cbError = pTpDecCallbacks->cbUpdateConfig(pTpDecCallbacks->cbUpdateConfigData, &pAsc[TPDEC_TRACKINDEX(prog,lay)]);
+            if (cbError != 0) {
+              return TRANSPORTDEC_UNKOWN_ERROR;
+            }
+          }
+        }
+
+        p_linfo->m_frameLengthType = FDKreadBits(bs,3);
+        switch( p_linfo->m_frameLengthType ) {
+        case 0:
+          p_linfo->m_bufferFullness = FDKreadBits(bs,8);
+
+          if (!pLatmDemux->m_allStreamsSameTimeFraming) {
+            if ((lay > 0) && (pAsc[TPDEC_TRACKINDEX(prog,lay)].m_aot == AOT_AAC_SCAL || pAsc[TPDEC_TRACKINDEX(prog,lay)].m_aot == AOT_ER_AAC_SCAL)) {
+              return TRANSPORTDEC_UNSUPPORTED_FORMAT;
+            }
+          }
+          break;
+        case 1:
+          /* frameLength = FDKreadBits(bs,9); */
+        case 3:
+        case 4:
+        case 5:
+          /* CELP */
+        case 6:
+        case 7:
+          /* HVXC */
+        default:
+          return TRANSPORTDEC_PARSE_ERROR; //_LATM_INVALIDFRAMELENGTHTYPE;
+
+        }  /* switch framelengthtype*/
+
+      }  /* layer loop */
+    }  /* prog loop */
+
+    pLatmDemux->m_otherDataPresent = FDKreadBits(bs,1);
+    pLatmDemux->m_otherDataLength  = 0;
+
+    if (pLatmDemux->m_otherDataPresent) {
+      int otherDataLenEsc  = 0;
+      do {
+        pLatmDemux->m_otherDataLength <<= 8;   // *= 256
+        otherDataLenEsc = FDKreadBits(bs,1);
+        pLatmDemux->m_otherDataLength += FDKreadBits(bs,8);
+      } while (otherDataLenEsc);
+    }
+
+    pLatmDemux->m_crcCheckPresent = FDKreadBits(bs,1);
+    pLatmDemux->m_crcCheckSum     = 0;
+
+    if (pLatmDemux->m_crcCheckPresent) {
+      pLatmDemux->m_crcCheckSum = FDKreadBits(bs,8);
+    }
+
+  }
+  else {
+    /* audioMuxVersionA > 0 is reserved for future extensions */
+    ErrorStatus = TRANSPORTDEC_UNSUPPORTED_FORMAT;
+  }
+  return (ErrorStatus);
+}
+
+TRANSPORTDEC_ERROR CLatmDemux_ReadPayloadLengthInfo(HANDLE_FDK_BITSTREAM bs, CLatmDemux *pLatmDemux)
+{
+  TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
+  int totalPayloadBits = 0;
+
+  if( pLatmDemux->m_allStreamsSameTimeFraming == 1 ) {
+    for (UINT prog=0; prog<pLatmDemux->m_numProgram; prog++ ) {
+      for (UINT lay=0; lay<pLatmDemux->m_numLayer; lay++ ) {
+        LATM_LAYER_INFO *p_linfo = &pLatmDemux->m_linfo[prog][lay];
+
+        switch (p_linfo->m_frameLengthType ) {
+        case 0:
+          p_linfo->m_frameLengthInBits = CLatmDemux_ReadAuChunkLengthInfo(bs);
+          totalPayloadBits += p_linfo->m_frameLengthInBits;
+          break;
+        case 3:
+        case 5:
+        case 7:
+        default:
+          return TRANSPORTDEC_PARSE_ERROR; //AAC_DEC_LATM_INVALIDFRAMELENGTHTYPE;
+        }
+      }
+    }
+  }
+  else {
+    ErrorStatus = TRANSPORTDEC_PARSE_ERROR; //AAC_DEC_LATM_TIMEFRAMING;
+  }
+  if (pLatmDemux->m_audioMuxLengthBytes > 0 && totalPayloadBits > pLatmDemux->m_audioMuxLengthBytes*8) {
+    return TRANSPORTDEC_PARSE_ERROR;
+  }
+  return (ErrorStatus);
+}
+
+int CLatmDemux_ReadAuChunkLengthInfo(HANDLE_FDK_BITSTREAM bs)
+{
+  UCHAR endFlag;
+  int len = 0;
+
+  do {
+    UCHAR tmp = (UCHAR) FDKreadBits(bs,8);
+    endFlag = (tmp < 255);
+
+    len += tmp;
+
+  } while( endFlag == 0 );
+
+  len <<= 3;  /* convert from bytes to bits */
+
+  return len;
+}
+
+int CLatmDemux_GetFrameLengthInBits(CLatmDemux *pLatmDemux)
+{
+  return pLatmDemux->m_linfo[0][0].m_frameLengthInBits;
+}
+
+int CLatmDemux_GetOtherDataPresentFlag(CLatmDemux *pLatmDemux)
+{
+  return pLatmDemux->m_otherDataPresent ? 1 : 0;
+}
+
+int CLatmDemux_GetOtherDataLength(CLatmDemux *pLatmDemux)
+{
+  return pLatmDemux->m_otherDataLength;
+}
+
+UINT CLatmDemux_GetNrOfSubFrames(CLatmDemux *pLatmDemux)
+{
+  return pLatmDemux->m_noSubFrames;
+}
+