libAACenc/src/pnsparam.cpp

   1
   2 /* -----------------------------------------------------------------------------------------------------------
   3 Software License for The Fraunhofer FDK AAC Codec Library for Android
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  10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
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  73 5.    CONTACT INFORMATION
  74
  75 Fraunhofer Institute for Integrated Circuits IIS
  76 Attention: Audio and Multimedia Departments - FDK AAC LL
  77 Am Wolfsmantel 33
  78 91058 Erlangen, Germany
  79
  80 www.iis.fraunhofer.de/amm
  81 amm-info@iis.fraunhofer.de
  82 ----------------------------------------------------------------------------------------------------------- */
  83
  84 /******************************** MPEG Audio Encoder **************************
  85
  86    Initial author:       M.Lohwasser
  87    contents/description: PNS parameters depending on bitrate and bandwidth
  88
  89 ******************************************************************************/
  90
  91 #include "pnsparam.h"
  92 #include "psy_configuration.h"
  93
  94 typedef struct {
  95   SHORT     startFreq;
  96   /* Parameters for detection */
  97   FIXP_SGL  refPower;
  98   FIXP_SGL  refTonality;
  99   SHORT     tnsGainThreshold;     /* scaled by TNS_PREDGAIN_SCALE (=1000) */
 100   SHORT     tnsPNSGainThreshold;  /* scaled by TNS_PREDGAIN_SCALE (=1000) */
 101   FIXP_SGL  gapFillThr;
 102   SHORT     minSfbWidth;
 103   USHORT    detectionAlgorithmFlags;
 104 } PNS_INFO_TAB;
 105
 106
 107 typedef struct {
 108   ULONG brFrom;
 109   ULONG brTo;
 110   UCHAR S22050;
 111   UCHAR S24000;
 112   UCHAR S32000;
 113   UCHAR S44100;
 114   UCHAR S48000;
 115 } AUTO_PNS_TAB;
 116
 117 static const AUTO_PNS_TAB levelTable_mono[]= {
 118   {0,      11999, 1, 1, 1, 1, 1,},
 119   {12000,  19999, 1, 1, 1, 1, 1,},
 120   {20000,  28999, 2, 1, 1, 1, 1,},
 121   {29000,  40999, 4, 4, 4, 2, 2,},
 122   {41000,  55999, 9, 9, 7, 7, 7,},
 123   {56000,  79999, 0, 0, 0, 9, 9,},
 124   {80000,  99999, 0, 0, 0, 0, 0,},
 125   {100000,999999, 0, 0, 0, 0, 0,},
 126 };
 127
 128 static const AUTO_PNS_TAB levelTable_stereo[]= {
 129   {0,      11999, 1, 1, 1, 1, 1,},
 130   {12000,  19999, 3, 1, 1, 1, 1,},
 131   {20000,  28999, 3, 3, 3, 2, 2,},
 132   {29000,  40999, 7, 6, 6, 5, 5,},
 133   {41000,  55999, 9, 9, 7, 7, 7,},
 134   {56000,  79999, 0, 0, 0, 0, 0,},
 135   {80000,  99999, 0, 0, 0, 0, 0,},
 136   {100000,999999, 0, 0, 0, 0, 0,},
 137 };
 138
 139
 140 static const PNS_INFO_TAB pnsInfoTab[] = {
 141 /*0   pns off */
 142 /*1*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.06), 1150, 1200, FL2FXCONST_SGL(0.02), 8,
 143         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
 144 /*2*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1130, 1300, FL2FXCONST_SGL(0.05), 8,
 145         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
 146 /*3*/ { 4100, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1100, 1400, FL2FXCONST_SGL(0.10), 8,
 147         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
 148 /*4*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8,
 149         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
 150 /*5*/ { 4300, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8,
 151         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
 152 /*6*/ { 5000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.25), 8,
 153         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
 154 /*7*/ { 5500, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1100, 1400, FL2FXCONST_SGL(0.35), 8,
 155         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
 156 /*8*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1080, 1400, FL2FXCONST_SGL(0.40), 8,
 157         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
 158 /*9*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.14), 1070, 1400, FL2FXCONST_SGL(0.45), 8,
 159         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
 160 };
 161
 162 static const AUTO_PNS_TAB levelTable_lowComplexity[]= {
 163   {0,      27999, 0, 0, 0, 0, 0,},
 164   {28000,  31999, 2, 2, 2, 2, 2,},
 165   {32000,  47999, 3, 3, 3, 3, 3,},
 166   {48000,  48000, 4, 4, 4, 4, 4,},
 167   {48001, 999999, 0, 0, 0, 0, 0,},
 168 };
 169
 170 /* conversion of old LC tuning tables to new (LD enc) structure (only entries which are actually used were converted) */
 171 static const PNS_INFO_TAB pnsInfoTab_lowComplexity[] = {
 172 /*0   pns off */
 173       /* DEFAULT parameter set */
 174 /*1*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.16), 1100, 1400, FL2FXCONST_SGL(0.5), 16,
 175         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
 176 /*2*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16,
 177         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
 178 /*3*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.5), 16,
 179         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
 180       /* LOWSUBST -> PNS is used less often than with DEFAULT parameter set (for br: 48000 - 79999) */
 181 /*4*/ { 4100, FL2FXCONST_SGL(0.20), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16,
 182         USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
 183 };
 184
 185 /****************************************************************************
 186   function to look up used pns level
 187 ****************************************************************************/
 188 int FDKaacEnc_lookUpPnsUse (int bitRate, int sampleRate, int numChan, const int isLC) {
 189
 190   int hUsePns=0, size, i;
 191   const AUTO_PNS_TAB *levelTable;
 192
 193   if (isLC) {
 194     levelTable = &levelTable_lowComplexity[0];
 195     size = sizeof(levelTable_lowComplexity);
 196   } else
 197   { /* (E)LD */
 198     levelTable = (numChan > 1) ? &levelTable_stereo[0] : &levelTable_mono[0];
 199     size = (numChan > 1) ? sizeof(levelTable_stereo) : sizeof(levelTable_mono);
 200   }
 201
 202   for(i = 0; i < (int) (size/sizeof(AUTO_PNS_TAB)); i++) {
 203     if(((ULONG)bitRate >= levelTable[i].brFrom) &&
 204        ((ULONG)bitRate <= levelTable[i].brTo) )
 205       break;
 206   }
 207
 208   /* sanity check */
 209   if ((int)(sizeof(pnsInfoTab)/sizeof(PNS_INFO_TAB)) < i ) {
 210     return (PNS_TABLE_ERROR);
 211   }
 212
 213   switch (sampleRate) {
 214   case 22050: hUsePns = levelTable[i].S22050; break;
 215   case 24000: hUsePns = levelTable[i].S24000; break;
 216   case 32000: hUsePns = levelTable[i].S32000; break;
 217   case 44100: hUsePns = levelTable[i].S44100; break;
 218   case 48000: hUsePns = levelTable[i].S48000; break;
 219   default:
 220     if (isLC) {
 221       hUsePns = levelTable[i].S48000;
 222     }
 223     break;
 224   }
 225
 226   return (hUsePns);
 227 }
 228
 229
 230 /*****************************************************************************
 231
 232     functionname: FDKaacEnc_GetPnsParam
 233     description:  Gets PNS parameters depending on bitrate and bandwidth
 234     returns:      error status
 235     input:        Noiseparams struct, bitrate, sampling rate,
 236                   number of sfb's, pointer to sfb offset
 237     output:       PNS parameters
 238
 239 *****************************************************************************/
 240 AAC_ENCODER_ERROR FDKaacEnc_GetPnsParam(NOISEPARAMS *np,
 241                                         INT         bitRate,
 242                                         INT         sampleRate,
 243                                         INT         sfbCnt,
 244                                         const INT   *sfbOffset,
 245                                         INT         *usePns,
 246                                         INT         numChan,
 247                                         const int   isLC)
 248
 249 {
 250     int i, hUsePns;
 251     const PNS_INFO_TAB *pnsInfo;
 252
 253     if (isLC) {
 254       np->detectionAlgorithmFlags = IS_LOW_COMLEXITY;
 255       pnsInfo = pnsInfoTab_lowComplexity;
 256     }
 257     else
 258     {
 259       np->detectionAlgorithmFlags = 0;
 260       pnsInfo = pnsInfoTab;
 261     }
 262
 263     if (*usePns<=0)
 264         return AAC_ENC_OK;
 265
 266     /* new pns params */
 267     hUsePns = FDKaacEnc_lookUpPnsUse (bitRate, sampleRate, numChan, isLC);
 268     if (hUsePns == 0) {
 269       *usePns = 0;
 270         return AAC_ENC_OK;
 271         }
 272     if (hUsePns == PNS_TABLE_ERROR)
 273       return AAC_ENC_PNS_TABLE_ERROR;
 274
 275     /* select correct row of tuning table */
 276     pnsInfo += hUsePns-1;
 277
 278     np->startSfb = FDKaacEnc_FreqToBandWithRounding( pnsInfo->startFreq,
 279         sampleRate,
 280         sfbCnt,
 281         sfbOffset );
 282
 283     np->detectionAlgorithmFlags |= pnsInfo->detectionAlgorithmFlags;
 284
 285     np->refPower             = FX_SGL2FX_DBL(pnsInfo->refPower);
 286     np->refTonality          = FX_SGL2FX_DBL(pnsInfo->refTonality);
 287     np->tnsGainThreshold     = pnsInfo->tnsGainThreshold;
 288     np->tnsPNSGainThreshold  = pnsInfo->tnsPNSGainThreshold;
 289     np->minSfbWidth          = pnsInfo->minSfbWidth;
 290
 291     np->gapFillThr           = (FIXP_SGL)pnsInfo->gapFillThr;
 292
 293     /* assuming a constant dB/Hz slope in the signal's PSD curve,
 294     the detection threshold needs to be corrected for the width of the band */
 295     for ( i = 0; i < (sfbCnt-1); i++)
 296     {
 297         INT qtmp, sfbWidth;
 298         FIXP_DBL tmp;
 299
 300         sfbWidth = sfbOffset[i+1]-sfbOffset[i];
 301
 302         tmp = fPow(np->refPower, 0, sfbWidth, DFRACT_BITS-1-5, &qtmp);
 303         np->powDistPSDcurve[i] = (FIXP_SGL)((LONG)(scaleValue(tmp, qtmp) >> 16));
 304     }
 305     np->powDistPSDcurve[sfbCnt] = np->powDistPSDcurve[sfbCnt-1];
 306
 307   return AAC_ENC_OK;
 308 }