Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 326 insertions, 0 deletions

diff --git a/libMpegTPDec/src/tpdec_adts.cpp b/libMpegTPDec/src/tpdec_adts.cpp
new file mode 100644
index 0000000..e64ae82
--- /dev/null
+++ b/libMpegTPDec/src/tpdec_adts.cpp
@@ -0,0 +1,326 @@
+/*****************************  MPEG-4 AAC Decoder  **************************
+
+                        (C) Copyright Fraunhofer IIS (2004)
+                               All Rights Reserved
+
+    Please be advised that this software and/or program delivery is
+    Confidential Information of Fraunhofer and subject to and covered by the
+
+    Fraunhofer IIS Software Evaluation Agreement
+    between Google Inc. and  Fraunhofer
+    effective and in full force since March 1, 2012.
+
+    You may use this software and/or program only under the terms and
+    conditions described in the above mentioned Fraunhofer IIS Software
+    Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+   $Id$
+   Author(s):   Josef Hoepfl
+   Description: ADTS interface
+
+   This software and/or program is protected by copyright law and international
+   treaties. Any reproduction or distribution of this software and/or program,
+   or any portion of it, may result in severe civil and criminal penalties, and
+   will be prosecuted to the maximum extent possible under law.
+
+******************************************************************************/
+
+#include "tpdec_adts.h"
+
+
+#include "FDK_bitstream.h"
+
+
+
+void adtsRead_CrcInit(HANDLE_ADTS pAdts) /*!< pointer to adts crc info stucture */
+{
+  FDKcrcInit(&pAdts->crcInfo, 0x8005, 0xFFFF, 16);
+}
+
+int adtsRead_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->bs.protection_absent) {
+    return 0;
+  }
+
+  return ( FDKcrcStartReg(&pAdts->crcInfo, hBs, mBits) );
+
+}
+
+void adtsRead_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->bs.protection_absent == 0)
+  {
+    FDKcrcEndReg(&pAdts->crcInfo, hBs, reg);
+  }
+}
+
+TRANSPORTDEC_ERROR adtsRead_CrcCheck( HANDLE_ADTS pAdts )
+{
+  TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
+  USHORT crc;
+
+  if (pAdts->bs.protection_absent)
+    return TRANSPORTDEC_OK;
+
+  crc = FDKcrcGetCRC(&pAdts->crcInfo);
+  if (crc != pAdts->crcReadValue)
+  {
+    return (TRANSPORTDEC_CRC_ERROR);
+  }
+
+  return (ErrorStatus);
+}
+
+
+
+#define Adts_Length_SyncWord                     12
+#define Adts_Length_Id                            1
+#define Adts_Length_Layer                         2
+#define Adts_Length_ProtectionAbsent              1
+#define Adts_Length_Profile                       2
+#define Adts_Length_SamplingFrequencyIndex        4
+#define Adts_Length_PrivateBit                    1
+#define Adts_Length_ChannelConfiguration          3
+#define Adts_Length_OriginalCopy                  1
+#define Adts_Length_Home                          1
+#define Adts_Length_CopyrightIdentificationBit    1
+#define Adts_Length_CopyrightIdentificationStart  1
+#define Adts_Length_FrameLength                  13
+#define Adts_Length_BufferFullness               11
+#define Adts_Length_NumberOfRawDataBlocksInFrame  2
+#define Adts_Length_CrcCheck                     16
+
+TRANSPORTDEC_ERROR adtsRead_DecodeHeader(
+        HANDLE_ADTS           pAdts,
+        CSAudioSpecificConfig *pAsc,
+        HANDLE_FDK_BITSTREAM  hBs,
+        const INT             ignoreBufferFullness
+        )
+{
+  INT crcReg;
+
+  INT valBits;
+  INT cmp_buffer_fullness;
+  int i, adtsHeaderLength;
+
+  STRUCT_ADTS_BS bs;
+
+#ifdef TP_PCE_ENABLE
+  CProgramConfig oldPce;
+  /* Store the old PCE temporarily. Maybe we'll need it later if we
+     have channelConfig=0 and no PCE in this frame. */
+  FDKmemcpy(&oldPce, &pAsc->m_progrConfigElement, sizeof(CProgramConfig));
+#endif
+
+  valBits = FDKgetValidBits(hBs);
+
+  /* adts_fixed_header */
+  bs.mpeg_id           = FDKreadBits(hBs, Adts_Length_Id);
+  bs.layer             = FDKreadBits(hBs, Adts_Length_Layer);
+  bs.protection_absent = FDKreadBits(hBs, Adts_Length_ProtectionAbsent);
+  bs.profile           = FDKreadBits(hBs, Adts_Length_Profile);
+  bs.sample_freq_index = FDKreadBits(hBs, Adts_Length_SamplingFrequencyIndex);
+  bs.private_bit       = FDKreadBits(hBs, Adts_Length_PrivateBit);
+  bs.channel_config    = FDKreadBits(hBs, Adts_Length_ChannelConfiguration);
+  bs.original          = FDKreadBits(hBs, Adts_Length_OriginalCopy);
+  bs.home              = FDKreadBits(hBs, Adts_Length_Home);
+
+  /* adts_variable_header */
+  bs.copyright_id    = FDKreadBits(hBs, Adts_Length_CopyrightIdentificationBit);
+  bs.copyright_start = FDKreadBits(hBs, Adts_Length_CopyrightIdentificationStart);
+  bs.frame_length    = FDKreadBits(hBs, Adts_Length_FrameLength);
+  bs.adts_fullness   = FDKreadBits(hBs, Adts_Length_BufferFullness);
+  bs.num_raw_blocks  = FDKreadBits(hBs, Adts_Length_NumberOfRawDataBlocksInFrame);
+  bs.num_pce_bits    = 0;
+
+  adtsHeaderLength = ADTS_HEADERLENGTH;
+
+  if (!bs.protection_absent) {
+    FDKcrcReset(&pAdts->crcInfo);
+    FDKpushBack(hBs, 56);   /* complete fixed and variable header! */
+    crcReg = FDKcrcStartReg(&pAdts->crcInfo, hBs, 0);
+    FDKpushFor(hBs, 56);
+  }
+
+  if (! bs.protection_absent && bs.num_raw_blocks>0) {
+    for (i=0; i<bs.num_raw_blocks; i++) {
+      pAdts->rawDataBlockDist[i] = (USHORT)FDKreadBits(hBs, 16);
+      adtsHeaderLength += 16;
+    }
+    /* Change raw data blocks to delta values */
+    pAdts->rawDataBlockDist[bs.num_raw_blocks] = bs.frame_length - 7 - bs.num_raw_blocks*2 - 2 ;
+    for (i=bs.num_raw_blocks; i>0; i--) {
+      pAdts->rawDataBlockDist[i] -= pAdts->rawDataBlockDist[i-1];
+    }
+  }
+
+  /* adts_error_check */
+  if (!bs.protection_absent)
+  {
+    USHORT crc_check;
+
+    FDKcrcEndReg(&pAdts->crcInfo, hBs, crcReg);
+    crc_check = FDKreadBits(hBs, Adts_Length_CrcCheck);
+    adtsHeaderLength += Adts_Length_CrcCheck;
+
+    pAdts->crcReadValue = crc_check;
+    /* Check header CRC in case of multiple raw data blocks */
+    if (bs.num_raw_blocks > 0) {
+      if (pAdts->crcReadValue != FDKcrcGetCRC(&pAdts->crcInfo)) {
+        return TRANSPORTDEC_CRC_ERROR;
+      }
+      /* Reset CRC for the upcoming raw_data_block() */
+      FDKcrcReset(&pAdts->crcInfo);
+    }
+  }
+
+
+  /* check if valid header */
+  if (
+      (bs.layer != 0) ||                          // we only support MPEG ADTS
+      (bs.sample_freq_index >= 13)                // we only support 96kHz - 7350kHz
+      ) {
+    FDKpushFor(hBs, bs.frame_length * 8);   // try again one frame later
+    return TRANSPORTDEC_UNSUPPORTED_FORMAT;
+  }
+
+  /* special treatment of id-bit */
+  if ( (bs.mpeg_id == 0) && (pAdts->decoderCanDoMpeg4 == 0) )
+  {
+    /* MPEG-2 decoder cannot play MPEG-4 bitstreams */
+
+
+    FDKpushFor(hBs, bs.frame_length * 8);  // try again one frame later
+    return TRANSPORTDEC_UNSUPPORTED_FORMAT;
+  }
+
+  if (!ignoreBufferFullness)
+  {
+    cmp_buffer_fullness = bs.frame_length*8 + bs.adts_fullness*32*getNumberOfEffectiveChannels(bs.channel_config);
+
+
+    /* Evaluate buffer fullness */
+    if (bs.adts_fullness != 0x7FF)
+    {
+      if (pAdts->BufferFullnesStartFlag)
+      {
+        if ( valBits < cmp_buffer_fullness )
+        {
+          /* Condition for start of decoding is not fulfilled */
+
+          /* The current frame will not be decoded */
+          FDKpushBack(hBs, adtsHeaderLength);
+
+          if ( (cmp_buffer_fullness+adtsHeaderLength) > ((TRANSPORTDEC_INBUF_SIZE<<3)-7) ) {
+            return TRANSPORTDEC_SYNC_ERROR;
+          } else {
+            return TRANSPORTDEC_NOT_ENOUGH_BITS;
+          }
+        }
+        else
+        {
+          pAdts->BufferFullnesStartFlag = 0;
+        }
+      }
+    }
+  }
+
+
+  /* Get info from ADTS header */
+  AudioSpecificConfig_Init(pAsc);
+  pAsc->m_aot                    = (AUDIO_OBJECT_TYPE)(bs.profile + 1);
+  pAsc->m_samplingFrequencyIndex = bs.sample_freq_index;
+  pAsc->m_samplingFrequency      = SamplingRateTable[bs.sample_freq_index];
+  pAsc->m_channelConfiguration   = bs.channel_config;
+  pAsc->m_samplesPerFrame        = 1024;
+
+#ifdef TP_PCE_ENABLE
+  if (bs.channel_config == 0)
+  {
+    int pceBits = 0;
+    UINT alignAnchor = FDKgetValidBits(hBs);
+    
+    if (FDKreadBits(hBs,3) == ID_PCE) {
+      /* Got luck! Parse the PCE */
+      int crcReg;
+      crcReg = adtsRead_CrcStartReg(pAdts, hBs, 0);
+
+      CProgramConfig_Read(&pAsc->m_progrConfigElement, hBs, alignAnchor);
+
+      adtsRead_CrcEndReg(pAdts, hBs, crcReg);
+      pceBits = alignAnchor - FDKgetValidBits(hBs);
+      /* store the number of PCE bits */
+      bs.num_pce_bits = pceBits;
+    }
+    else {
+      /* No PCE in this frame! Push back the ID tag bits. */
+      FDKpushBack(hBs,3);
+
+      /* Encoders do not have to write a PCE in each frame.
+         So if we already have a valid PCE we have to use it. */
+      if (  oldPce.isValid
+        && (bs.sample_freq_index == pAdts->bs.sample_freq_index)  /* we could compare the complete fixed header (bytes) here! */
+        && (bs.channel_config    == pAdts->bs.channel_config) /* == 0 */
+        && (bs.mpeg_id           == pAdts->bs.mpeg_id) )
+      { /* Restore previous PCE which is still valid */
+        FDKmemcpy(&pAsc->m_progrConfigElement, &oldPce, sizeof(CProgramConfig));
+      }
+      else if (bs.mpeg_id == 0) {
+        /* If not it seems that we have a implicit channel configuration.
+           This mode is not allowed in the context of ISO/IEC 14496-3.
+           Skip this frame and try the next one. */
+        FDKpushFor(hBs, (bs.frame_length<<3) - adtsHeaderLength - 3);
+        return TRANSPORTDEC_UNSUPPORTED_FORMAT;
+      }
+      /* else {
+         ISO/IEC 13818-7 implicit channel mapping is allowed.
+         So just open the box of chocolates to see what we got.
+      } */
+    }
+  }
+#endif /* TP_PCE_ENABLE */
+
+  /* Copy bit stream data struct to persistent memory now, once we passed all sanity checks above. */
+  FDKmemcpy(&pAdts->bs, &bs, sizeof(STRUCT_ADTS_BS));
+
+  return TRANSPORTDEC_OK;
+}
+
+int adtsRead_GetRawDataBlockLength(
+        HANDLE_ADTS pAdts,
+        INT         blockNum
+        )
+{
+  int length;
+
+  if (pAdts->bs.num_raw_blocks == 0) {
+    length = (pAdts->bs.frame_length - 7) << 3;    /* aac_frame_length subtracted by the header size (7 bytes). */
+    if (pAdts->bs.protection_absent == 0)
+      length -= 16;                                                                   /* substract 16 bit CRC */
+  } else {
+    if (pAdts->bs.protection_absent) {
+      length = -1; /* raw data block length is unknown */
+    } else {
+      if (blockNum < 0 || blockNum > 3) {
+        return TRANSPORTDEC_INVALID_PARAMETER;
+      }
+      length = (pAdts->rawDataBlockDist[blockNum] << 3) - 16;
+    }
+  }
+  if (blockNum == 0) {
+    length -= pAdts->bs.num_pce_bits;
+  }
+  return length;
+}
+
+