Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 316 insertions, 0 deletions

diff --git a/libAACenc/src/bandwidth.cpp b/libAACenc/src/bandwidth.cpp
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+/*************************  Fast MPEG AAC Audio Encoder  **********************
+
+                     (C) Copyright Fraunhofer IIS (1999)
+                               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.
+
+
+   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.
+
+   $Id$
+   Initial author:       M. Schug / A. Groeschel
+   contents/description: bandwidth expert
+
+******************************************************************************/
+
+#include "channel_map.h"
+#include "bandwidth.h"
+#include "aacEnc_ram.h"
+
+typedef struct{
+  INT chanBitRate;
+  INT bandWidthMono;
+  INT bandWidth2AndMoreChan;
+
+} BANDWIDTH_TAB;
+
+static const BANDWIDTH_TAB bandWidthTable[] = {
+  {0,      3700,  5000},
+  {12000,  5000,  6400},
+  {20000,  6900,  9640},
+  {28000,  9600, 13050},
+  {40000, 12060, 14260},
+  {56000, 13950, 15500},
+  {72000, 14200, 16120},
+  {96000, 17000, 17000},
+  {576001,17000, 17000}
+};
+
+
+static const BANDWIDTH_TAB bandWidthTable_LD_22050[] = {
+  { 8000,  2000,  2400},
+  {12000,  2500,  2700},
+  {16000,  3300,  3100},
+  {24000,  6250,  7200},
+  {32000,  9200,  10500},
+  {40000,  16000, 16000},
+  {48000,  16000, 16000},
+  {360001, 16000, 16000}
+};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_24000[] = {
+  { 8000,  2000,  2000},
+  {12000,  2000,  2300},
+  {16000,  2200,  2500},
+  {24000,  5650,  6400},
+  {32000,  11600, 12000},
+  {40000,  12000, 16000},
+  {48000,  16000, 16000},
+  {64000,  16000, 16000},
+  {360001, 16000, 16000}
+};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_32000[] = {
+  { 8000,  2000,  2000},
+  {12000,  2000,  2000},
+  {24000,  4250,  5200},
+  {32000,  8400,  9000},
+  {40000,  9400,  11300},
+  {48000,  11900, 13700},
+  {64000,  14800, 16000},
+  {76000,  16000, 16000},
+  {360001, 16000, 16000}
+};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_44100[] = {
+  { 8000,  2000,  2000},
+  {24000,  2000,  2000},
+  {32000,  4400,  5700},
+  {40000,  7400,  8800},
+  {48000,  9000,  10700},
+  {56000,  11000, 12900},
+  {64000,  14400, 15500},
+  {80000,  16000, 16200},
+  {96000,  16500, 16000},
+  {128000, 16000, 16000},
+  {360001, 16000, 16000}
+};
+
+static const BANDWIDTH_TAB bandWidthTable_LD_48000[] = {
+  { 8000,  2000,  2000},
+  {24000,  2000,  2000},
+  {32000,  4400,  5700},
+  {40000,  7400,  8800},
+  {48000,  9000,  10700},
+  {56000,  11000, 12800},
+  {64000,  14300, 15400},
+  {80000,  16000, 16200},
+  {96000,  16500, 16000},
+  {128000, 16000, 16000},
+  {360001, 16000, 16000}
+};
+
+typedef struct{
+  AACENC_BITRATE_MODE bitrateMode;
+  int bandWidthMono;
+  int bandWidth2AndMoreChan;
+} BANDWIDTH_TAB_VBR;
+
+static const BANDWIDTH_TAB_VBR bandWidthTableVBR[]= {
+  {AACENC_BR_MODE_CBR,        0,     0},
+  {AACENC_BR_MODE_VBR_1,  13050, 13050},
+  {AACENC_BR_MODE_VBR_2,  13050, 13050},
+  {AACENC_BR_MODE_VBR_3,  14260, 14260},
+  {AACENC_BR_MODE_VBR_4,  15500, 15500},
+  {AACENC_BR_MODE_VBR_5,  48000, 48000},
+  {AACENC_BR_MODE_SFR,        0,     0},
+  {AACENC_BR_MODE_FF,         0,     0}
+
+};
+
+static INT GetBandwidthEntry(
+            const INT frameLength,
+            const INT sampleRate,
+            const INT chanBitRate,
+            const INT entryNo)
+{
+  INT bandwidth = -1;
+  const BANDWIDTH_TAB *pBwTab = NULL;
+  INT bwTabSize = 0;
+
+  switch (frameLength) {
+    case 960:
+    case 1024:
+      pBwTab = bandWidthTable;
+      bwTabSize = sizeof(bandWidthTable)/sizeof(BANDWIDTH_TAB);
+      break;
+    case 480:
+    case 512:
+      switch (sampleRate) {
+        case 8000:
+        case 11025:
+        case 12000:
+        case 16000:
+        case 22050:
+          pBwTab = bandWidthTable_LD_22050;
+          bwTabSize = sizeof(bandWidthTable_LD_22050)/sizeof(BANDWIDTH_TAB);
+          break;
+        case 24000:
+          pBwTab = bandWidthTable_LD_24000;
+          bwTabSize = sizeof(bandWidthTable_LD_24000)/sizeof(BANDWIDTH_TAB);
+          break;
+        case 32000:
+          pBwTab = bandWidthTable_LD_32000;
+          bwTabSize = sizeof(bandWidthTable_LD_32000)/sizeof(BANDWIDTH_TAB);
+          break;
+        case (44100):
+          pBwTab = bandWidthTable_LD_44100;
+          bwTabSize = sizeof(bandWidthTable_LD_44100)/sizeof(BANDWIDTH_TAB);
+          break;
+        case 48000:
+        case 64000:
+        case 88200:
+        case 96000:
+          pBwTab = bandWidthTable_LD_48000;
+          bwTabSize = sizeof(bandWidthTable_LD_48000)/sizeof(BANDWIDTH_TAB);
+          break;
+      }
+      break;
+    default:
+      pBwTab = NULL;
+      bwTabSize = 0;
+  }
+
+  if (pBwTab!=NULL) {
+    int i;
+    for (i=0; i<bwTabSize-1; i++) {
+      if (chanBitRate >= pBwTab[i].chanBitRate &&
+          chanBitRate < pBwTab[i+1].chanBitRate)
+      {
+        switch (frameLength) {
+          case 960:
+          case 1024:
+            bandwidth = (entryNo==0)
+              ? pBwTab[i].bandWidthMono
+              : pBwTab[i].bandWidth2AndMoreChan;
+            break;
+          case 480:
+          case 512:
+            {
+              INT q_res = 0;
+              INT startBw = (entryNo==0) ?  pBwTab[i  ].bandWidthMono : pBwTab[i  ].bandWidth2AndMoreChan;
+              INT endBw =   (entryNo==0) ?  pBwTab[i+1].bandWidthMono : pBwTab[i+1].bandWidth2AndMoreChan;
+              INT startBr = pBwTab[i].chanBitRate;
+              INT endBr = pBwTab[i+1].chanBitRate;
+
+              FIXP_DBL bwFac_fix = fDivNorm(chanBitRate-startBr, endBr-startBr, &q_res);
+              bandwidth = (INT)scaleValue(fMult(bwFac_fix, (FIXP_DBL)(endBw-startBw)),q_res) + startBw;
+            }
+            break;
+          default:
+            bandwidth = -1;
+        }
+        break;
+      } /* within bitrate range */
+    }
+  } /* pBwTab!=NULL */
+
+  return bandwidth;
+}
+
+
+AAC_ENCODER_ERROR FDKaacEnc_DetermineBandWidth(INT* bandWidth,
+                                               INT proposedBandWidth,
+                                               INT bitrate,
+                                               AACENC_BITRATE_MODE bitrateMode,
+                                               INT sampleRate,
+                                               INT frameLength,
+                                               CHANNEL_MAPPING* cm,
+                                               CHANNEL_MODE encoderMode)
+{
+  AAC_ENCODER_ERROR ErrorStatus = AAC_ENC_OK;
+  //FIXP_DBL invBandWidthGain=FL2FXCONST_DBL(1.f);
+  INT chanBitRate = bitrate/cm->nChannels;
+
+  /* vbr */
+  switch(bitrateMode){
+  case AACENC_BR_MODE_VBR_1:
+  case AACENC_BR_MODE_VBR_2:
+  case AACENC_BR_MODE_VBR_3:
+  case AACENC_BR_MODE_VBR_4:
+  case AACENC_BR_MODE_VBR_5:
+    if (proposedBandWidth != 0){
+      /* use given bw */
+      *bandWidth = proposedBandWidth;
+    } else {
+      /* take bw from table */
+      switch(encoderMode){
+      case MODE_1:
+        *bandWidth = bandWidthTableVBR[bitrateMode].bandWidthMono;
+        break;
+      case MODE_2:
+      case MODE_1_2:
+      case MODE_1_2_1:
+      case MODE_1_2_2:
+      case MODE_1_2_2_1:
+      case MODE_1_2_2_2_1:
+        *bandWidth = bandWidthTableVBR[bitrateMode].bandWidth2AndMoreChan;
+        break;
+      default:
+        return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
+      }
+    }
+    break;
+  case AACENC_BR_MODE_CBR:
+  case AACENC_BR_MODE_SFR:
+  case AACENC_BR_MODE_FF:
+
+    /* bandwidth limiting */
+    if (proposedBandWidth != 0) {
+      *bandWidth = FDKmin(proposedBandWidth, FDKmin(20000, sampleRate>>1));
+    }
+    else { /* search reasonable bandwidth */
+
+      int entryNo = 0;
+
+      switch(encoderMode){
+      case MODE_1:        /* mono      */
+        entryNo = 0;      /* use mono bandwith settings */
+        break;
+
+      case MODE_2:        /* stereo    */
+      case MODE_1_2:      /* sce + cpe */
+      case MODE_1_2_1:    /* sce + cpe + sce */
+      case MODE_1_2_2:    /* sce + cpe + cpe */
+      case MODE_1_2_2_1:  /* (5.1) sce + cpe + cpe + lfe */
+      case MODE_1_2_2_2_1: /* (7.1) sce + cpe + cpe + cpe + lfe */
+        entryNo = 1;      /* use stereo bandwith settings */
+        break;
+
+      default:
+        return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
+      }
+
+      *bandWidth = GetBandwidthEntry(
+            frameLength,
+            sampleRate,
+            chanBitRate,
+            entryNo);
+
+      if (*bandWidth==-1) {
+        ErrorStatus = AAC_ENC_INVALID_CHANNEL_BITRATE;
+      }
+    }
+    break;
+  default:
+    *bandWidth = 0;
+    return AAC_ENC_UNSUPPORTED_BITRATE_MODE;
+  }
+
+  *bandWidth = FDKmin(*bandWidth, sampleRate/2);
+
+  return ErrorStatus;;
+}