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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 Audio Encoder **************************
+
+   Initial author:       Alex Groeschel
+   contents/description: ADTS Transport Headers support
+
+******************************************************************************/
+
+#include "tpenc_adts.h"
+
+
+#include "tpenc_lib.h"
+#include "tpenc_asc.h"
+
+
+int adtsWrite_CrcStartReg(
+                                 HANDLE_ADTS pAdts,          /*!< pointer to adts stucture */
+                                 HANDLE_FDK_BITSTREAM hBs,   /*!< handle to current bit buffer structure */
+                                 int mBits                   /*!< number of bits in crc region */
+                                )
+{
+  if (pAdts->protection_absent) {
+    return 0;
+  }
+  return ( FDKcrcStartReg(&pAdts->crcInfo, hBs, mBits) );
+}
+
+void adtsWrite_CrcEndReg(
+                                HANDLE_ADTS pAdts, /*!< pointer to adts crc info stucture */
+                                HANDLE_FDK_BITSTREAM hBs,   /*!< handle to current bit buffer structure */
+                                int reg                    /*!< crc region */
+                               )
+{
+  if (pAdts->protection_absent == 0)
+  {
+    FDKcrcEndReg(&pAdts->crcInfo, hBs, reg);
+  }
+}
+
+int adtsWrite_GetHeaderBits( HANDLE_ADTS hAdts )
+{
+  int bits = 0;
+
+  if (hAdts->currentBlock == 0) {
+    /* Static and variable header bits */
+    bits = 56;
+    if (!hAdts->protection_absent) {
+      /* Add header/ single raw data block CRC bits */
+      bits += 16;
+      if (hAdts->num_raw_blocks>0) {
+        /* Add bits of raw data block position markers */
+        bits += (hAdts->num_raw_blocks)*16;
+      }
+    }
+  }
+  if (!hAdts->protection_absent && hAdts->num_raw_blocks>0) {
+    /* Add raw data block CRC bits. Not really part of the header, put they cause bit overhead to be accounted. */
+    bits += 16;
+  }
+
+  hAdts->headerBits = bits;
+
+  return bits;
+}
+
+INT adtsWrite_Init(HANDLE_ADTS hAdts, CODER_CONFIG *config)
+{
+  /* Sanity checks */
+  if ( config->nSubFrames < 1
+    || config->nSubFrames > 4
+    || (int)config->aot > 4
+    || (int)config->aot < 1 ) {
+    return -1;
+  }
+
+  /* fixed header */
+  if (config->flags & CC_MPEG_ID) {
+    hAdts->mpeg_id = 0; /* MPEG 4 */
+  } else {
+    hAdts->mpeg_id = 1; /* MPEG 2 */
+  }
+  hAdts->layer=0;
+  hAdts->protection_absent = ! (config->flags & CC_PROTECTION);
+  hAdts->profile = ((int)config->aot) - 1;
+  hAdts->sample_freq_index = getSamplingRateIndex(config->samplingRate);
+  hAdts->sample_freq = config->samplingRate;
+  hAdts->private_bit=0;
+  hAdts->channel_mode = config->channelMode;
+  hAdts->original=0;
+  hAdts->home=0;
+  /* variable header */
+  hAdts->copyright_id=0;
+  hAdts->copyright_start=0;
+
+  hAdts->num_raw_blocks=config->nSubFrames-1; /* 0 means 1 raw data block */
+
+  FDKcrcInit(&hAdts->crcInfo, 0x8005, 0xFFFF, 16);
+
+  hAdts->currentBlock = 0;
+
+
+  return 0;
+}
+
+int adtsWrite_EncodeHeader(HANDLE_ADTS hAdts,
+                                 HANDLE_FDK_BITSTREAM hBitStream,
+                                 int buffer_fullness,
+                                 int frame_length)
+{
+  INT crcIndex = 0;
+
+
+  hAdts->headerBits = adtsWrite_GetHeaderBits(hAdts);
+
+  FDK_ASSERT(((frame_length+hAdts->headerBits)/8)<0x2000);      /*13 bit*/
+  FDK_ASSERT(buffer_fullness<0x800);    /* 11 bit   */
+
+  if (!hAdts->protection_absent) {
+    FDKcrcReset(&hAdts->crcInfo);
+  }
+
+  if (hAdts->currentBlock == 0) {
+    FDKresetBitbuffer(hBitStream, BS_WRITER);
+  }
+
+  hAdts->subFrameStartBit = FDKgetValidBits(hBitStream);
+
+  /* Skip new header if this is raw data block 1..n */
+  if (hAdts->currentBlock == 0)
+  {
+    FDKresetBitbuffer(hBitStream, BS_WRITER);
+
+    if (hAdts->num_raw_blocks == 0) {
+      crcIndex = adtsWrite_CrcStartReg(hAdts, hBitStream, 0);
+    }
+
+    /* fixed header */
+    FDKwriteBits(hBitStream, 0xFFF, 12);
+    FDKwriteBits(hBitStream, hAdts->mpeg_id, 1);
+    FDKwriteBits(hBitStream, hAdts->layer, 2);
+    FDKwriteBits(hBitStream, hAdts->protection_absent, 1);
+    FDKwriteBits(hBitStream, hAdts->profile, 2);
+    FDKwriteBits(hBitStream, hAdts->sample_freq_index, 4);
+    FDKwriteBits(hBitStream, hAdts->private_bit, 1);
+    FDKwriteBits(hBitStream, getChannelConfig(hAdts->channel_mode), 3);
+    FDKwriteBits(hBitStream, hAdts->original, 1);
+    FDKwriteBits(hBitStream, hAdts->home, 1);
+    /* variable header */
+    FDKwriteBits(hBitStream, hAdts->copyright_id, 1);
+    FDKwriteBits(hBitStream, hAdts->copyright_start, 1);
+    FDKwriteBits(hBitStream, (frame_length + hAdts->headerBits)>>3, 13);
+    FDKwriteBits(hBitStream, buffer_fullness, 11);
+    FDKwriteBits(hBitStream, hAdts->num_raw_blocks, 2);
+
+    if (!hAdts->protection_absent) {
+      int i;
+
+      /* End header CRC portion for single raw data block and write dummy zero values for unknown fields. */
+      if (hAdts->num_raw_blocks == 0) {
+        adtsWrite_CrcEndReg(hAdts, hBitStream, crcIndex);
+      } else {
+        for (i=0; i<hAdts->num_raw_blocks; i++) {
+          FDKwriteBits(hBitStream, 0, 16);
+        }
+      }
+      FDKwriteBits(hBitStream, 0, 16);
+    }
+  } /* End of ADTS header */
+
+  return 0;
+}
+
+void adtsWrite_EndRawDataBlock(HANDLE_ADTS hAdts,
+                          HANDLE_FDK_BITSTREAM hBs,
+                          int *pBits)
+{
+  if (!hAdts->protection_absent) {
+    FDK_BITSTREAM bsWriter;
+
+    FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, BS_WRITER);
+    FDKpushFor(&bsWriter, 56);
+
+    if (hAdts->num_raw_blocks == 0) {
+      FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16);
+    } else {
+      int distance;
+
+      /* Write CRC of current raw data block */
+      FDKwriteBits(hBs, FDKcrcGetCRC(&hAdts->crcInfo), 16);
+
+      /* Write distance to current data block */
+      if (hAdts->currentBlock < hAdts->num_raw_blocks) {
+        FDKpushFor(&bsWriter, hAdts->currentBlock*16);
+        distance = FDKgetValidBits(hBs) - (56 + (hAdts->num_raw_blocks)*16 + 16);
+        FDKwriteBits(&bsWriter, distance>>3, 16);
+      }
+    }
+    FDKsyncCache(&bsWriter);
+  }
+
+  /* Write total frame lenth for multiple raw data blocks and header CRC */
+  if (hAdts->num_raw_blocks > 0 && hAdts->currentBlock == hAdts->num_raw_blocks) {
+    FDK_BITSTREAM bsWriter;
+    int crcIndex = 0;
+
+    FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, BS_WRITER);
+
+    if (!hAdts->protection_absent) {
+      FDKcrcReset(&hAdts->crcInfo);
+      crcIndex = FDKcrcStartReg(&hAdts->crcInfo, &bsWriter, 0);
+    }
+    /* Write total frame length */
+    FDKpushFor(&bsWriter, 56-28+2);
+    FDKwriteBits(&bsWriter, FDKgetValidBits(hBs)>>3, 13);
+
+    /* Write header CRC */
+    if (!hAdts->protection_absent) {
+      FDKpushFor(&bsWriter, 11+2 + (hAdts->num_raw_blocks)*16);
+      FDKcrcEndReg(&hAdts->crcInfo, &bsWriter, crcIndex);
+      FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16);
+    }
+    FDKsyncCache(&bsWriter);
+  }
+
+  /* Correct *pBits to reflect the amount of bits of the current subframe */
+  *pBits -= hAdts->subFrameStartBit;
+  if (!hAdts->protection_absent && hAdts->num_raw_blocks > 0) {
+    /* Fixup CRC bits, since they come after each raw data block */
+    *pBits += 16;
+  }
+  hAdts->currentBlock++;
+}
+