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Diffstat (limited to 'libAACenc/src/pnsparam.cpp')
| -rw-r--r-- | libAACenc/src/pnsparam.cpp | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/libAACenc/src/pnsparam.cpp b/libAACenc/src/pnsparam.cpp new file mode 100644 index 0000000..0babc4a --- /dev/null +++ b/libAACenc/src/pnsparam.cpp @@ -0,0 +1,248 @@ +/******************************** MPEG Audio Encoder ************************** + + (C) Copyright Fraunhofer IIS (2001) + 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.Lohwasser + contents/description: PNS parameters depending on bitrate and bandwidth + +******************************************************************************/ + +#include "pnsparam.h" +#include "psy_configuration.h" + +typedef struct { + SHORT startFreq; + /* Parameters for detection */ + FIXP_SGL refPower; + FIXP_SGL refTonality; + SHORT tnsGainThreshold; /* scaled by TNS_PREDGAIN_SCALE (=1000) */ + SHORT tnsPNSGainThreshold; /* scaled by TNS_PREDGAIN_SCALE (=1000) */ + FIXP_SGL gapFillThr; + SHORT minSfbWidth; + USHORT detectionAlgorithmFlags; +} PNS_INFO_TAB; + + +typedef struct { + ULONG brFrom; + ULONG brTo; + UCHAR S22050; + UCHAR S24000; + UCHAR S32000; + UCHAR S44100; + UCHAR S48000; +} AUTO_PNS_TAB; + +static const AUTO_PNS_TAB levelTable_mono[]= { + {0, 11999, 1, 1, 1, 1, 1,}, + {12000, 19999, 1, 1, 1, 1, 1,}, + {20000, 28999, 2, 1, 1, 1, 1,}, + {29000, 40999, 4, 4, 4, 2, 2,}, + {41000, 55999, 9, 9, 7, 7, 7,}, + {56000, 79999, 0, 0, 0, 9, 9,}, + {80000, 99999, 0, 0, 0, 0, 0,}, + {100000,999999, 0, 0, 0, 0, 0,}, +}; + +static const AUTO_PNS_TAB levelTable_stereo[]= { + {0, 11999, 1, 1, 1, 1, 1,}, + {12000, 19999, 3, 1, 1, 1, 1,}, + {20000, 28999, 3, 3, 3, 2, 2,}, + {29000, 40999, 7, 6, 6, 5, 5,}, + {41000, 55999, 9, 9, 7, 7, 7,}, + {56000, 79999, 0, 0, 0, 0, 0,}, + {80000, 99999, 0, 0, 0, 0, 0,}, + {100000,999999, 0, 0, 0, 0, 0,}, +}; + + +static const PNS_INFO_TAB pnsInfoTab[] = { +/*0 pns off */ +/*1*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.06), 1150, 1200, FL2FXCONST_SGL(0.02), 8, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ }, +/*2*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1130, 1300, FL2FXCONST_SGL(0.05), 8, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ }, +/*3*/ { 4100, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1100, 1400, FL2FXCONST_SGL(0.10), 8, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ }, +/*4*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ }, +/*5*/ { 4300, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, +/*6*/ { 5000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.25), 8, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, +/*7*/ { 5500, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1100, 1400, FL2FXCONST_SGL(0.35), 8, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, +/*8*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1080, 1400, FL2FXCONST_SGL(0.40), 8, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, +/*9*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.14), 1070, 1400, FL2FXCONST_SGL(0.45), 8, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, +}; + +static const AUTO_PNS_TAB levelTable_lowComplexity[]= { + //{0, 23999, 1, 1, 1, 1, 1,}, + //{24000, 31999, 2, 2, 2, 2, 2,}, + {0, 27999, 0, 0, 0, 0, 0,}, + {28000, 31999, 2, 2, 2, 2, 2,}, + {32000, 47999, 3, 3, 3, 3, 3,}, + {48000, 48000, 4, 4, 4, 4, 4,}, + {48001, 999999, 0, 0, 0, 0, 0,}, +}; + +/* conversion of old LC tuning tables to new (LD enc) structure (only entries which are actually used were converted) */ +static const PNS_INFO_TAB pnsInfoTab_lowComplexity[] = { +/*0 pns off */ + /* DEFAULT parameter set */ +/*1*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.16), 1100, 1400, FL2FXCONST_SGL(0.5), 16, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, +/*2*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, +/*3*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.5), 16, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, + /* LOWSUBST -> PNS is used less often than with DEFAULT parameter set (for br: 48000 - 79999) */ +/*4*/ { 4100, FL2FXCONST_SGL(0.20), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16, + USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW }, +}; + +/**************************************************************************** + function to look up used pns level +****************************************************************************/ +int FDKaacEnc_lookUpPnsUse (int bitRate, int sampleRate, int numChan, const int isLC) { + + int hUsePns=0, size, i; + const AUTO_PNS_TAB *levelTable; + + if (isLC) { + levelTable = &levelTable_lowComplexity[0]; + size = sizeof(levelTable_lowComplexity); + } else + { /* (E)LD */ + levelTable = (numChan > 1) ? &levelTable_stereo[0] : &levelTable_mono[0]; + size = (numChan > 1) ? sizeof(levelTable_stereo) : sizeof(levelTable_mono); + } + + for(i = 0; i < (int) (size/sizeof(AUTO_PNS_TAB)); i++) { + if(((ULONG)bitRate >= levelTable[i].brFrom) && + ((ULONG)bitRate <= levelTable[i].brTo) ) + break; + } + + /* sanity check */ + if ((int)(sizeof(pnsInfoTab)/sizeof(PNS_INFO_TAB)) < i ) { + return (PNS_TABLE_ERROR); + } + + switch (sampleRate) { + case 22050: hUsePns = levelTable[i].S22050; break; + case 24000: hUsePns = levelTable[i].S24000; break; + case 32000: hUsePns = levelTable[i].S32000; break; + case 44100: hUsePns = levelTable[i].S44100; break; + case 48000: hUsePns = levelTable[i].S48000; break; + default: + if (isLC) { + hUsePns = levelTable[i].S48000; + } + break; + } + + return (hUsePns); +} + + +/***************************************************************************** + + functionname: FDKaacEnc_GetPnsParam + description: Gets PNS parameters depending on bitrate and bandwidth + returns: error status + input: Noiseparams struct, bitrate, sampling rate, + number of sfb's, pointer to sfb offset + output: PNS parameters + +*****************************************************************************/ +AAC_ENCODER_ERROR FDKaacEnc_GetPnsParam(NOISEPARAMS *np, + INT bitRate, + INT sampleRate, + INT sfbCnt, + const INT *sfbOffset, + INT *usePns, + INT numChan, + const int isLC) + +{ + int i, hUsePns; + const PNS_INFO_TAB *pnsInfo; + + if (isLC) { + np->detectionAlgorithmFlags = IS_LOW_COMLEXITY; + pnsInfo = pnsInfoTab_lowComplexity; + } + else + { + np->detectionAlgorithmFlags = 0; + pnsInfo = pnsInfoTab; + } + + if (*usePns<=0) + return AAC_ENC_OK; + + /* new pns params */ + hUsePns = FDKaacEnc_lookUpPnsUse (bitRate, sampleRate, numChan, isLC); + if (hUsePns == 0) { + *usePns = 0; + return AAC_ENC_OK; + } + if (hUsePns == PNS_TABLE_ERROR) + return AAC_ENC_PNS_TABLE_ERROR; + + /* select correct row of tuning table */ + pnsInfo += hUsePns-1; + + np->startSfb = FDKaacEnc_FreqToBandWithRounding( pnsInfo->startFreq, + sampleRate, + sfbCnt, + sfbOffset ); + + np->detectionAlgorithmFlags |= pnsInfo->detectionAlgorithmFlags; + + np->refPower = FX_SGL2FX_DBL(pnsInfo->refPower); + np->refTonality = FX_SGL2FX_DBL(pnsInfo->refTonality); + np->tnsGainThreshold = pnsInfo->tnsGainThreshold; + np->tnsPNSGainThreshold = pnsInfo->tnsPNSGainThreshold; + np->minSfbWidth = pnsInfo->minSfbWidth; + + np->gapFillThr = (FIXP_SGL)pnsInfo->gapFillThr; + + /* assuming a constant dB/Hz slope in the signal's PSD curve, + the detection threshold needs to be corrected for the width of the band */ + for ( i = 0; i < (sfbCnt-1); i++) + { + INT qtmp, sfbWidth; + FIXP_DBL tmp; + + sfbWidth = sfbOffset[i+1]-sfbOffset[i]; + + tmp = fPow(np->refPower, 0, sfbWidth, DFRACT_BITS-1-5, &qtmp); + np->powDistPSDcurve[i] = (FIXP_SGL)((LONG)(scaleValue(tmp, qtmp) >> 16)); + } + np->powDistPSDcurve[sfbCnt] = np->powDistPSDcurve[sfbCnt-1]; + + return AAC_ENC_OK; +} |