--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/videoeditorengine/audioeditorengine/codecs/MP4/src/mp4aud.cpp	Fri Jan 29 14:08:33 2010 +0200
@@ -0,0 +1,330 @@
+/*
+* Copyright (c) 2010 Ixonos Plc.
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - Initial contribution
+*
+* Contributors:
+* Ixonos Plc
+*
+* Description:
+*
+*/
+
+
+/**************************************************************************
+  mp4aud.cpp - MPEG-4 Audio interface to MPEG-4 Systems layer.
+
+  Author(s): Juha Ojanpera
+  Copyright (c) 2001-2004 by Nokia Research Center, Speech and Audio Systems.
+  *************************************************************************/
+
+/*-- Project Headers. --*/
+#include "nok_bits.h"
+#include "mp4aud.h"
+#include "AACAPI.h"
+const int32 sample_rates[] = {
+  96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 
+  11025, 8000, 0, 0, 0, 0
+};
+
+/*
+ * Reads program configuration element from the specified bitstream.
+ */
+static INLINE int16
+GetPCE(TBitStream *bs, ProgConfig *p, TInt *numChans)
+{
+  int16 i;
+
+  p->tag = (int16) BsGetBits(bs, LEN_TAG);
+  p->profile = (int16) BsGetBits(bs, LEN_PROFILE);
+  p->sample_rate_idx = (int16) BsGetBits(bs, LEN_SAMP_IDX);
+  p->front.num_ele = (int16) BsGetBits(bs, LEN_NUM_ELE);
+  p->side.num_ele = (int16) BsGetBits(bs, LEN_NUM_ELE);
+  p->back.num_ele = (int16) BsGetBits(bs, LEN_NUM_ELE);
+  p->lfe.num_ele = (int16) BsGetBits(bs, LEN_NUM_LFE);
+  p->data.num_ele = (int16) BsGetBits(bs, LEN_NUM_DAT);
+  p->coupling.num_ele = (int16) BsGetBits(bs, LEN_NUM_CCE);
+
+  p->mono_mix.present = (int16) BsGetBits(bs, 1);
+  if(p->mono_mix.present == 1)
+    p->mono_mix.ele_tag = (int16) BsGetBits(bs, LEN_TAG);
+
+  p->stereo_mix.present = (int16) BsGetBits(bs, 1);
+  if(p->stereo_mix.present == 1)
+    p->stereo_mix.ele_tag = (int16) BsGetBits(bs, LEN_TAG);
+
+  p->matrix_mix.present = (int16) BsGetBits(bs, 1);
+  if(p->matrix_mix.present == 1)
+  {
+    p->matrix_mix.ele_tag = (int16) BsGetBits(bs, LEN_MMIX_IDX);
+    p->matrix_mix.pseudo_enab = (int16) BsGetBits(bs, LEN_PSUR_ENAB);
+  }
+
+  for(i = 0; i < p->front.num_ele; i++)
+  {
+    p->front.ele_is_cpe[i] = (int16) BsGetBits(bs, LEN_ELE_IS_CPE);
+    p->front.ele_tag[i] = (int16) BsGetBits(bs, LEN_TAG);
+
+    *numChans += (p->front.ele_is_cpe[i] == 1) ? 2 : 1;
+  }
+
+  for(i = 0; i < p->side.num_ele; i++)
+  {
+    p->side.ele_is_cpe[i] = (int16) BsGetBits(bs, LEN_ELE_IS_CPE);
+    p->side.ele_tag[i] = (int16) BsGetBits(bs, LEN_TAG);
+
+    *numChans += (p->front.ele_is_cpe[i] == 1) ? 2 : 1;
+  }
+
+  for(i = 0; i < p->back.num_ele; i++)
+  {
+    p->back.ele_is_cpe[i] = (int16) BsGetBits(bs, LEN_ELE_IS_CPE);
+    p->back.ele_tag[i] = (int16) BsGetBits(bs, LEN_TAG);
+
+    *numChans += (p->front.ele_is_cpe[i] == 1) ? 2 : 1;
+  }
+
+  for(i = 0; i < p->lfe.num_ele; i++)
+  {
+    *numChans += 1;
+
+    p->lfe.ele_is_cpe[i] = 0;
+    p->lfe.ele_tag[i] = (int16) BsGetBits(bs, LEN_TAG);
+  }
+
+  for(i = 0; i < p->data.num_ele; i++)
+  {
+    p->data.ele_is_cpe[i] = 0;
+    p->data.ele_tag[i] = (int16) BsGetBits(bs, LEN_TAG);
+  }
+
+  for(i = 0; i < p->coupling.num_ele; i++)
+  {
+    p->coupling.ele_is_cpe[i] = (int16) BsGetBits(bs, LEN_ELE_IS_CPE);
+    p->coupling.ele_tag[i] = (int16) BsGetBits(bs, LEN_TAG);
+  }
+
+  BsByteAlign(bs);
+
+  p->num_comment_bytes = (int16) BsGetBits(bs, LEN_COMMENT_BYTES);
+  for(i = 0; i < p->num_comment_bytes; i++)
+    p->comments[i] = (uint8) BsGetBits(bs, LEN_BYTE);
+  p->comments[i] = 0;
+
+  return (p->tag);
+}
+
+/*
+ * Determines sampling rate index for the MPEG-4 decoder. The input sampling
+ * rate as specified in the audio config part is not one of the rates listed
+ * in the standard.
+ */
+static INLINE int16
+DetermineSamplingFreqIdx(int32 samplingFreq)
+{
+  int16 idx;
+
+  if(samplingFreq >= 92017L)                               idx = 0;
+  else if(samplingFreq < 92017L && samplingFreq >= 75132L) idx = 1;
+  else if(samplingFreq < 75132L && samplingFreq >= 55426)  idx = 2;
+  else if(samplingFreq < 55426L && samplingFreq >= 46009L) idx = 3;
+  else if(samplingFreq < 46009L && samplingFreq >= 37566L) idx = 4;
+  else if(samplingFreq < 37566L && samplingFreq >= 27713L) idx = 5;
+  else if(samplingFreq < 27713L && samplingFreq >= 23004L) idx = 6;
+  else if(samplingFreq < 23004L && samplingFreq >= 18783L) idx = 7;
+  else if(samplingFreq < 18783L && samplingFreq >= 13856L) idx = 8;
+  else if(samplingFreq < 13856L && samplingFreq >= 11502L) idx = 9;
+  else if(samplingFreq < 11502L && samplingFreq >= 9391L)  idx = 10;
+  else                                                     idx = 11;
+
+  return (idx);
+}
+
+/*
+ * Reads GA decoder configuration information from the specified bitstream.
+ */
+static INLINE BOOL
+ReadGASpecificInfo(TBitStream *bs, AudioSpecificInfo *audInfo, ProgConfig *progCfg)
+{
+  int16 extensionFlag;
+  GaSpecificInfo *gaInfo = &audInfo->gaInfo;
+
+  gaInfo->FrameLengthFlag = (BOOL) BsGetBits(bs, 1);
+  gaInfo->DependsOnCoreCoder = (BOOL) BsGetBits(bs, 1);
+  gaInfo->CoreCoderDelay = (gaInfo->DependsOnCoreCoder) ? (int16) BsGetBits(bs, 14) : (int16)0;
+  extensionFlag = (int16) BsGetBits(bs, 1);
+
+  if(audInfo->channelConfiguration == 0)
+  {
+    TInt numChans = 0;
+
+    GetPCE(bs, progCfg, &numChans);
+    audInfo->channelConfiguration = (uint8) numChans;
+    if (audInfo->samplingFreqIdx != (uint8) progCfg->sample_rate_idx)
+        {
+        return FALSE;
+        }
+  }
+
+  /*
+   * Determine the sampling rate index so that sampling rate dependent
+   * tables can be initialized.
+   */
+  if(audInfo->samplingFreqIdx == 0xf && audInfo->channelConfiguration != 0)
+  {
+    audInfo->samplingFreqIdx = (uint8) DetermineSamplingFreqIdx(audInfo->samplingFrequency);
+    progCfg->sample_rate_idx = audInfo->samplingFreqIdx;
+  }
+  else
+    {
+
+    audInfo->samplingFreqIdx = (uint8) progCfg->sample_rate_idx;
+  
+    }
+
+  if(audInfo->audioObject == AAC_SCALABLE || audInfo->audioObject == ER_AAC_SCALABLE)
+    gaInfo->layerNr = (uint8) BsGetBits(bs, 3);
+  
+  if(extensionFlag)
+  {
+    if(audInfo->audioObject == ER_BSAC)
+    {
+      gaInfo->numOfSubframe = (uint8) BsGetBits(bs, 5);
+      gaInfo->layer_length = (uint8) BsGetBits(bs, 11);
+    }
+    
+    switch(audInfo->audioObject)
+    {
+      case ER_AAC_LC:
+      case ER_AAC_LTP:
+      case ER_AAC_SCALABLE:
+      case ER_TWINVQ:
+      case ER_AAC_LD:
+        gaInfo->aacSectionDataResilienceFlag = (BOOL) BsGetBits(bs, 1);
+        gaInfo->aacScalefactorDataResilienceFlag = (BOOL) BsGetBits(bs, 1);
+        gaInfo->aacSpectralDataResilienceFlag = (BOOL) BsGetBits(bs, 1);
+        break;
+
+      default:
+        break;
+    }
+
+    extensionFlag = (int16) BsGetBits(bs, 1);
+    if(extensionFlag)
+    {
+      ;
+    }
+  }
+  return TRUE;
+}
+
+/*
+ * Reads MPEG-4 audio decoder specific configuration information.
+ *
+ * Retuns TRUE on success, FALSE otherwise. FALSE indicates that 
+ * unsupported decoder configuration (e.g., object type) was detected.
+ */
+static INLINE BOOL
+ReadAudioSpecificConfig(TBitStream *bs, AudioSpecificInfo *audInfo, 
+            ProgConfig *progCfg, int32 bufLen)
+{
+  int16 bitsLeft;
+  AudioObjectType audObj;
+
+  /*-- Read common configuration information. --*/
+  audObj = audInfo->audioObject = (AudioObjectType)(BsGetBits(bs, 5) - 1);
+  audInfo->samplingFreqIdx = (uint8) BsGetBits(bs, 4);
+  audInfo->samplingFrequency = sample_rates[audInfo->samplingFreqIdx];
+  if(audInfo->samplingFreqIdx == 0xf)
+    audInfo->samplingFrequency = (int32) BsGetBits(bs, 24);
+  audInfo->channelConfiguration = (uint8) BsGetBits(bs, 4);
+
+  audInfo->extAudioObject = (AudioObjectType) 0;
+  audInfo->sbrPresentFlag = 0;
+
+  if(audInfo->audioObject == AAC_SBR)
+  {
+    audInfo->extAudioObject = audInfo->audioObject;
+    audInfo->sbrPresentFlag = 1;
+    audInfo->extSamplingFreqIdx = (uint8) BsGetBits(bs, 4);
+    if(audInfo->extSamplingFreqIdx == 0xf)
+      audInfo->extSamplingFrequency = (int32) BsGetBits(bs, 24);
+    audObj = audInfo->audioObject = (AudioObjectType)(BsGetBits(bs, 5) - 1);
+  }
+
+  /*-- Read object type specific configuration information. --*/
+  switch(audInfo->audioObject)
+  {
+    case AAC_MAIN:
+    case AAC_LC:
+    case AAC_LTP:
+      progCfg->profile = (int16) audObj;
+      progCfg->sample_rate_idx = audInfo->samplingFreqIdx;
+      if (ReadGASpecificInfo(bs, audInfo, progCfg) == FALSE)
+        {
+        return FALSE;
+        }
+      if(audInfo->samplingFreqIdx != 0xf)
+        audInfo->samplingFrequency = sample_rates[audInfo->samplingFreqIdx];
+      break;
+
+    default:
+      audObj = NULL_OBJECT;
+      break;
+  }
+
+  bitsLeft = (int16) ((bufLen << 3) - BsGetBitsRead(bs));
+  if(audInfo->extAudioObject != AAC_SBR && bitsLeft >= 16)
+  {
+    audInfo->syncExtensionType = (int16) BsGetBits(bs, 11);
+    if(audInfo->syncExtensionType == 0x2b7)
+    {
+      audInfo->extAudioObject = (AudioObjectType)(BsGetBits(bs, 5) - 1);
+      if(audInfo->extAudioObject == AAC_SBR)
+      {
+        audInfo->sbrPresentFlag = (uint8) BsGetBits(bs, 1);
+        if(audInfo->sbrPresentFlag)
+        {
+          audInfo->extSamplingFreqIdx = (uint8) BsGetBits(bs, 4);
+          if(audInfo->extSamplingFreqIdx == 0xf)
+            audInfo->extSamplingFrequency = (int32) BsGetBits(bs, 24);
+        }
+      }
+    }
+  }
+
+  return ((audObj == NULL_OBJECT) ? (BOOL) FALSE : (BOOL) TRUE);
+}
+
+BOOL
+ReadMP4AudioConfig(uint8 *buffer, uint32 bufLen, mp4AACTransportHandle *mp4AAC_ff)
+{
+  TBitStream bs;
+  BOOL retValue;
+
+  BsInit(&bs, buffer, bufLen);
+
+  retValue = ReadAudioSpecificConfig(&bs, &mp4AAC_ff->audioInfo, &mp4AAC_ff->progCfg, bufLen);
+
+  return (retValue);
+}
+
+void
+WriteMP4AudioConfig(uint8 *buffer, uint32 bufLen, mp4AACTransportHandle /* *mp4AAC_ff*/)
+{
+
+  TBitStream bs;
+
+  BsInit(&bs, buffer, bufLen);
+
+  /*-- Change object type to LC. --*/
+  BsPutBits(&bs, 5, 2);
+
+}
+