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+
+/* -----------------------------------------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+ All rights reserved.
+
+ 1. INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
+the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
+This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
+audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
+independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
+of the MPEG specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
+may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
+individually for the purpose of encoding or decoding bit streams in products that are compliant with
+the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
+these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
+software may already be covered under those patent licenses when it is used for those licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
+are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
+applications information and documentation.
+
+2. COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification, are permitted without
+payment of copyright license fees provided that you satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
+your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation and/or other materials
+provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
+You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived from this library without
+prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
+software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
+and the date of any change. For modified versions of the FDK AAC Codec, the term
+"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
+"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
+
+3. NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
+ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
+respect to this software.
+
+You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
+by appropriate patent licenses.
+
+4. DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
+"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
+of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
+including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
+or business interruption, however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of this software, even if
+advised of the possibility of such damage.
+
+5. CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------------------------------------- */
+
+/******************************** MPEG Audio Encoder **************************
+
+ Initial author: M.Werner
+ contents/description: Psychoaccoustic configuration
+
+******************************************************************************/
+
+#include "psy_configuration.h"
+#include "adj_thr.h"
+#include "aacEnc_rom.h"
+
+#include "genericStds.h"
+
+#include "FDK_trigFcts.h"
+
+typedef struct{
+ LONG sampleRate;
+ const SFB_PARAM_LONG *paramLong;
+ const SFB_PARAM_SHORT *paramShort;
+}SFB_INFO_TAB;
+
+
+static const SFB_INFO_TAB sfbInfoTab[] = {
+ {8000, &p_FDKaacEnc_8000_long_1024, &p_FDKaacEnc_8000_short_128},
+ {11025, &p_FDKaacEnc_11025_long_1024, &p_FDKaacEnc_11025_short_128},
+ {12000, &p_FDKaacEnc_12000_long_1024, &p_FDKaacEnc_12000_short_128},
+ {16000, &p_FDKaacEnc_16000_long_1024, &p_FDKaacEnc_16000_short_128},
+ {22050, &p_FDKaacEnc_22050_long_1024, &p_FDKaacEnc_22050_short_128},
+ {24000, &p_FDKaacEnc_24000_long_1024, &p_FDKaacEnc_24000_short_128},
+ {32000, &p_FDKaacEnc_32000_long_1024, &p_FDKaacEnc_32000_short_128},
+ {44100, &p_FDKaacEnc_44100_long_1024, &p_FDKaacEnc_44100_short_128},
+ {48000, &p_FDKaacEnc_48000_long_1024, &p_FDKaacEnc_48000_short_128},
+ {64000, &p_FDKaacEnc_64000_long_1024, &p_FDKaacEnc_64000_short_128},
+ {88200, &p_FDKaacEnc_88200_long_1024, &p_FDKaacEnc_88200_short_128},
+ {96000, &p_FDKaacEnc_96000_long_1024, &p_FDKaacEnc_96000_short_128}
+
+};
+
+/* 22050 and 24000 Hz */
+static const SFB_PARAM_LONG p_22050_long_512 = {
+ 31,
+ { 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 8, 8, 8, 12, 12, 12, 16, 20, 24,
+ 28, 32, 32, 32, 32, 32, 32, 32, 32, 32,
+ 32}
+};
+
+/* 32000 Hz */
+static const SFB_PARAM_LONG p_32000_long_512 = {
+ 37,
+ { 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 8, 8, 8, 8, 8, 12,
+ 12, 12, 12, 16, 16, 16, 20, 24, 24, 28,
+ 32, 32, 32, 32, 32, 32, 32}
+};
+
+/* 44100 Hz */
+static const SFB_PARAM_LONG p_44100_long_512 = {
+ 36,
+ {4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 8, 8, 8, 8, 8,
+ 12, 12, 12, 12, 16, 20, 24, 28, 32, 32,
+ 32, 32, 32, 32, 32, 52}
+};
+
+static const SFB_INFO_TAB sfbInfoTabLD512[] = {
+ { 8000, &p_22050_long_512, NULL},
+ {11025, &p_22050_long_512, NULL},
+ {12000, &p_22050_long_512, NULL},
+ {16000, &p_22050_long_512, NULL},
+ {22050, &p_22050_long_512, NULL},
+ {24000, &p_22050_long_512, NULL},
+ {32000, &p_32000_long_512, NULL},
+ {44100, &p_44100_long_512, NULL},
+ {48000, &p_44100_long_512, NULL},
+ {64000, &p_44100_long_512, NULL},
+ {88200, &p_44100_long_512, NULL},
+ {96000, &p_44100_long_512, NULL},
+
+};
+
+
+/* 22050 and 24000 Hz */
+static const SFB_PARAM_LONG p_22050_long_480 = {
+ 30,
+ { 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 8, 8, 8, 12, 12, 12, 16, 20, 24,
+ 28, 32, 32, 32, 32, 32, 32, 32, 32, 32}
+};
+
+/* 32000 Hz */
+static const SFB_PARAM_LONG p_32000_long_480 = {
+ 37,
+ { 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 8, 8, 8, 8,
+ 8, 8, 12, 12, 12, 16, 16, 20, 24, 32,
+ 32, 32, 32, 32, 32, 32, 32}
+};
+
+/* 44100 Hz */
+static const SFB_PARAM_LONG p_44100_long_480 = {
+ 35,
+ { 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 8, 8, 8, 8, 8, 12,
+ 12, 12, 12, 12, 16, 16, 24, 28, 32, 32,
+ 32, 32, 32, 32, 48}
+};
+
+static const SFB_INFO_TAB sfbInfoTabLD480[] = {
+ { 8000, &p_22050_long_480, NULL},
+ {11025, &p_22050_long_480, NULL},
+ {12000, &p_22050_long_480, NULL},
+ {16000, &p_22050_long_480, NULL},
+ {22050, &p_22050_long_480, NULL},
+ {24000, &p_22050_long_480, NULL},
+ {32000, &p_32000_long_480, NULL},
+ {44100, &p_44100_long_480, NULL},
+ {48000, &p_44100_long_480, NULL},
+ {64000, &p_44100_long_480, NULL},
+ {88200, &p_44100_long_480, NULL},
+ {96000, &p_44100_long_480, NULL},
+
+};
+
+/* Fixed point precision definitions */
+#define Q_BARCVAL (25)
+
+static AAC_ENCODER_ERROR FDKaacEnc_initSfbTable(LONG sampleRate, INT blockType, INT granuleLength, INT *sfbOffset, INT *sfbCnt)
+{
+ INT i, specStartOffset = 0;
+ const UCHAR* sfbWidth = NULL;
+ const SFB_INFO_TAB *sfbInfo = NULL;
+ int size;
+
+ /*
+ select table
+ */
+ switch(granuleLength) {
+ case 1024:
+ case 960:
+ sfbInfo = sfbInfoTab;
+ size = (INT)(sizeof(sfbInfoTab)/sizeof(SFB_INFO_TAB));
+ break;
+ case 512:
+ sfbInfo = sfbInfoTabLD512;
+ size = sizeof(sfbInfoTabLD512);
+ break;
+ case 480:
+ sfbInfo = sfbInfoTabLD480;
+ size = sizeof(sfbInfoTabLD480);
+ break;
+ default:
+ return AAC_ENC_INVALID_FRAME_LENGTH;
+ }
+
+ for(i = 0; i < size; i++){
+ if(sfbInfo[i].sampleRate == sampleRate){
+ switch(blockType){
+ case LONG_WINDOW:
+ case START_WINDOW:
+ case STOP_WINDOW:
+ sfbWidth = sfbInfo[i].paramLong->sfbWidth;
+ *sfbCnt = sfbInfo[i].paramLong->sfbCnt;
+ break;
+ case SHORT_WINDOW:
+ sfbWidth = sfbInfo[i].paramShort->sfbWidth;
+ *sfbCnt = sfbInfo[i].paramShort->sfbCnt;
+ granuleLength /= TRANS_FAC;
+ break;
+ }
+ break;
+ }
+ }
+ if (i == size) {
+ return AAC_ENC_UNSUPPORTED_SAMPLINGRATE;
+ }
+
+ /*
+ calc sfb offsets
+ */
+ for(i = 0; i < *sfbCnt; i++){
+ sfbOffset[i] = specStartOffset;
+ specStartOffset += sfbWidth[i];
+ if (specStartOffset >= granuleLength) {
+ i++;
+ break;
+ }
+ }
+ *sfbCnt = fixMin(i,*sfbCnt);
+ sfbOffset[*sfbCnt] = fixMin(specStartOffset,granuleLength);
+
+ return AAC_ENC_OK;
+}
+
+
+/*****************************************************************************
+
+ functionname: FDKaacEnc_BarcLineValue
+ description: Calculates barc value for one frequency line
+ returns: barc value of line
+ input: number of lines in transform, index of line to check, Fs
+ output:
+
+*****************************************************************************/
+static FIXP_DBL FDKaacEnc_BarcLineValue(INT noOfLines, INT fftLine, LONG samplingFreq)
+{
+
+ FIXP_DBL FOURBY3EM4 = (FIXP_DBL)0x45e7b273; /* 4.0/3 * 0.0001 in q43 */
+ FIXP_DBL PZZZ76 = (FIXP_DBL)0x639d5e4a; /* 0.00076 in q41 */
+ FIXP_DBL ONE3P3 = (FIXP_DBL)0x35333333; /* 13.3 in q26 */
+ FIXP_DBL THREEP5 = (FIXP_DBL)0x1c000000; /* 3.5 in q27 */
+ FIXP_DBL INV480 = (FIXP_DBL)0x44444444; // 1/480 in q39
+
+ FIXP_DBL center_freq, x1, x2;
+ FIXP_DBL bvalFFTLine, atan1, atan2;
+
+ /* Theoritical maximum of center_freq (samp_freq*0.5) is 96khz * 0.5 = 48000 */
+ /* Theoritical maximum of x1 is 1.3333333e-4f * center_freq = 6.4, can keep in q28 */
+ /* Theoritical maximum of x2 is 0.00076f * center_freq = 36.48, can keep in q25 */
+
+ center_freq = fftLine * samplingFreq; /* q11 or q8 */
+
+ switch (noOfLines) {
+ case 1024:
+ center_freq = center_freq << 2; /* q13 */
+ break;
+ case 128:
+ center_freq = center_freq << 5; /* q13 */
+ break;
+ case 512:
+ center_freq = (fftLine * samplingFreq) << 3; // q13
+ break;
+ case 480:
+ center_freq = fMult(center_freq, INV480) << 4; // q13
+ break;
+ default:
+ center_freq = (FIXP_DBL)0;
+ }
+
+ x1 = fMult(center_freq, FOURBY3EM4); /* q13 * q43 - (DFRACT_BITS-1) = q25 */
+ x2 = fMult(center_freq, PZZZ76) << 2; /* q13 * q41 - (DFRACT_BITS-1) + 2 = q25 */
+
+ atan1 = fixp_atan(x1);
+ atan2 = fixp_atan(x2);
+
+ /* q25 (q26 * q30 - (DFRACT_BITS-1)) + q25 (q27 * q30 * q30) */
+ bvalFFTLine = fMult(ONE3P3, atan2) + fMult(THREEP5, fMult(atan1, atan1));
+ return(bvalFFTLine);
+
+}
+
+/*
+ do not consider energies below a certain input signal level,
+ i.e. of -96dB or 1 bit at 16 bit PCM resolution,
+ might need to be configurable to e.g. 24 bit PCM Input or a lower
+ resolution for low bit rates
+*/
+static void FDKaacEnc_InitMinPCMResolution(int numPb,
+ int *pbOffset,
+ FIXP_DBL *sfbPCMquantThreshold)
+{
+ /* PCM_QUANT_NOISE = FDKpow(10.0f, - 20.f / 10.0f) * ABS_LOW * NORM_PCM_ENERGY * FDKpow(2,PCM_QUANT_THR_SCALE) */
+ #define PCM_QUANT_NOISE ((FIXP_DBL)0x00547062)
+
+ for( int i = 0; i < numPb; i++ ) {
+ sfbPCMquantThreshold[i] = (pbOffset[i+1] - pbOffset[i]) * PCM_QUANT_NOISE;
+ }
+}
+
+static FIXP_DBL getMaskFactor(
+ const FIXP_DBL dbVal_fix,
+ const INT dbVal_e,
+ const FIXP_DBL ten_fix,
+ const INT ten_e
+ )
+{
+ INT q_msk;
+ FIXP_DBL mask_factor;
+
+ mask_factor = fPow(ten_fix, DFRACT_BITS-1-ten_e, -dbVal_fix, DFRACT_BITS-1-dbVal_e, &q_msk);
+ q_msk = fixMin(DFRACT_BITS-1,fixMax(-(DFRACT_BITS-1),q_msk));
+
+ if ( (q_msk>0) && (mask_factor>(FIXP_DBL)MAXVAL_DBL>>q_msk) ) {
+ mask_factor = (FIXP_DBL)MAXVAL_DBL;
+ }
+ else {
+ mask_factor = scaleValue(mask_factor, q_msk);
+ }
+
+ return (mask_factor);
+}
+
+static void FDKaacEnc_initSpreading(INT numPb,
+ FIXP_DBL *pbBarcValue,
+ FIXP_DBL *pbMaskLoFactor,
+ FIXP_DBL *pbMaskHiFactor,
+ FIXP_DBL *pbMaskLoFactorSprEn,
+ FIXP_DBL *pbMaskHiFactorSprEn,
+ const LONG bitrate,
+ const INT blockType)
+
+{
+ INT i;
+ FIXP_DBL MASKLOWSPREN, MASKHIGHSPREN;
+
+ FIXP_DBL MASKHIGH = (FIXP_DBL)0x30000000; /* 1.5 in q29 */
+ FIXP_DBL MASKLOW = (FIXP_DBL)0x60000000; /* 3.0 in q29 */
+ FIXP_DBL MASKLOWSPRENLONG = (FIXP_DBL)0x60000000; /* 3.0 in q29 */
+ FIXP_DBL MASKHIGHSPRENLONG = (FIXP_DBL)0x40000000; /* 2.0 in q29 */
+ FIXP_DBL MASKHIGHSPRENLONGLOWBR = (FIXP_DBL)0x30000000; /* 1.5 in q29 */
+ FIXP_DBL MASKLOWSPRENSHORT = (FIXP_DBL)0x40000000; /* 2.0 in q29 */
+ FIXP_DBL MASKHIGHSPRENSHORT = (FIXP_DBL)0x30000000; /* 1.5 in q29 */
+ FIXP_DBL TEN = (FIXP_DBL)0x50000000; /* 10.0 in q27 */
+
+ if (blockType != SHORT_WINDOW)
+ {
+ MASKLOWSPREN = MASKLOWSPRENLONG;
+ MASKHIGHSPREN = (bitrate>20000)?MASKHIGHSPRENLONG:MASKHIGHSPRENLONGLOWBR;
+ }
+ else
+ {
+ MASKLOWSPREN = MASKLOWSPRENSHORT;
+ MASKHIGHSPREN = MASKHIGHSPRENSHORT;
+ }
+
+ for(i=0; i<numPb; i++)
+ {
+ if (i > 0)
+ {
+ pbMaskHiFactor[i] = getMaskFactor(
+ fMult(MASKHIGH, (pbBarcValue[i] - pbBarcValue[i-1])), 23,
+ TEN, 27);
+
+ pbMaskLoFactor[i-1] = getMaskFactor(
+ fMult(MASKLOW, (pbBarcValue[i] - pbBarcValue[i-1])), 23,
+ TEN, 27);
+
+ pbMaskHiFactorSprEn[i] = getMaskFactor(
+ fMult(MASKHIGHSPREN, (pbBarcValue[i] - pbBarcValue[i-1])), 23,
+ TEN, 27);
+
+ pbMaskLoFactorSprEn[i-1] = getMaskFactor(
+ fMult(MASKLOWSPREN, (pbBarcValue[i] - pbBarcValue[i-1])), 23,
+ TEN, 27);
+ }
+ else
+ {
+ pbMaskHiFactor[i] = (FIXP_DBL)0;
+ pbMaskLoFactor[numPb-1] = (FIXP_DBL)0;
+ pbMaskHiFactorSprEn[i] = (FIXP_DBL)0;
+ pbMaskLoFactorSprEn[numPb-1] = (FIXP_DBL)0;
+ }
+ }
+}
+
+static void FDKaacEnc_initBarcValues(INT numPb,
+ INT *pbOffset,
+ INT numLines,
+ INT samplingFrequency,
+ FIXP_DBL *pbBval)
+{
+ INT i;
+ FIXP_DBL MAX_BARC = (FIXP_DBL)0x30000000; /* 24.0 in q25 */
+
+ for(i=0; i<numPb; i++)
+ {
+ FIXP_DBL v1, v2, cur_bark;
+ v1 = FDKaacEnc_BarcLineValue(numLines, pbOffset[i], samplingFrequency);
+ v2 = FDKaacEnc_BarcLineValue(numLines, pbOffset[i+1], samplingFrequency);
+ cur_bark = (v1 >> 1) + (v2 >> 1);
+ pbBval[i] = fixMin(cur_bark, MAX_BARC);
+ }
+}
+
+static void FDKaacEnc_initMinSnr(const LONG bitrate,
+ const LONG samplerate,
+ const INT numLines,
+ const INT *sfbOffset,
+ const INT sfbActive,
+ const INT blockType,
+ FIXP_DBL *sfbMinSnrLdData)
+{
+ INT sfb;
+
+ /* Fix conversion variables */
+ INT qbfac, qperwin, qdiv, qpeprt_const, qpeprt;
+ INT qtmp, qsnr, sfbWidth;
+
+ FIXP_DBL MAX_BARC = (FIXP_DBL)0x30000000; /* 24.0 in q25 */
+ FIXP_DBL MAX_BARCP1 = (FIXP_DBL)0x32000000; /* 25.0 in q25 */
+ FIXP_DBL BITS2PEFAC = (FIXP_DBL)0x4b851eb8; /* 1.18 in q30 */
+ FIXP_DBL PERS2P4 = (FIXP_DBL)0x624dd2f2; /* 0.024 in q36 */
+ FIXP_DBL ONEP5 = (FIXP_DBL)0x60000000; /* 1.5 in q30 */
+ FIXP_DBL MAX_SNR = (FIXP_DBL)0x33333333; /* 0.8 in q30 */
+ FIXP_DBL MIN_SNR = (FIXP_DBL)0x003126e9; /* 0.003 in q30 */
+
+ FIXP_DBL barcFactor, pePerWindow, pePart, barcWidth;
+ FIXP_DBL pePart_const, tmp, snr, one_qsnr, one_point5;
+
+ /* relative number of active barks */
+ barcFactor = fDivNorm(fixMin(FDKaacEnc_BarcLineValue(numLines, sfbOffset[sfbActive], samplerate), MAX_BARC),
+ MAX_BARCP1, &qbfac);
+
+ qbfac = DFRACT_BITS-1-qbfac;
+
+ pePerWindow = fDivNorm(bitrate, samplerate, &qperwin);
+ qperwin = DFRACT_BITS-1-qperwin;
+ pePerWindow = fMult(pePerWindow, BITS2PEFAC); qperwin = qperwin + 30 - (DFRACT_BITS-1);
+ pePerWindow = fMult(pePerWindow, PERS2P4); qperwin = qperwin + 36 - (DFRACT_BITS-1);
+
+ switch (numLines) {
+ case 1024:
+ qperwin = qperwin - 10;
+ break;
+ case 128:
+ qperwin = qperwin - 7;
+ break;
+ case 512:
+ qperwin = qperwin - 9;
+ break;
+ case 480:
+ qperwin = qperwin - 9;
+ pePerWindow = fMult(pePerWindow, FL2FXCONST_DBL(480.f/512.f));
+ break;
+ }
+
+ /* for short blocks it is assumed that more bits are available */
+ if (blockType == SHORT_WINDOW)
+ {
+ pePerWindow = fMult(pePerWindow, ONEP5);
+ qperwin = qperwin + 30 - (DFRACT_BITS-1);
+ }
+ pePart_const = fDivNorm(pePerWindow, barcFactor, &qdiv); qpeprt_const = qperwin - qbfac + DFRACT_BITS-1-qdiv;
+
+ for (sfb = 0; sfb < sfbActive; sfb++)
+ {
+ barcWidth = FDKaacEnc_BarcLineValue(numLines, sfbOffset[sfb+1], samplerate) -
+ FDKaacEnc_BarcLineValue(numLines, sfbOffset[sfb], samplerate);
+
+ /* adapt to sfb bands */
+ pePart = fMult(pePart_const, barcWidth); qpeprt = qpeprt_const + 25 - (DFRACT_BITS-1);
+
+ /* pe -> snr calculation */
+ sfbWidth = (sfbOffset[sfb+1] - sfbOffset[sfb]);
+ pePart = fDivNorm(pePart, sfbWidth, &qdiv); qpeprt += DFRACT_BITS-1-qdiv;
+
+ tmp = f2Pow(pePart, DFRACT_BITS-1-qpeprt, &qtmp);
+ qtmp = DFRACT_BITS-1-qtmp;
+
+ /* Subtract 1.5 */
+ qsnr = fixMin(qtmp, 30);
+ tmp = tmp >> (qtmp - qsnr);
+
+ if((30+1-qsnr) > (DFRACT_BITS-1))
+ one_point5 = (FIXP_DBL)0;
+ else
+ one_point5 = (FIXP_DBL)(ONEP5 >> (30+1-qsnr));
+
+ snr = (tmp>>1) - (one_point5); qsnr -= 1;
+
+ /* max(snr, 1.0) */
+ if(qsnr > 0)
+ one_qsnr = (FIXP_DBL)(1 << qsnr);
+ else
+ one_qsnr = (FIXP_DBL)0;
+
+ snr = fixMax(one_qsnr, snr);
+
+ /* 1/snr */
+ snr = fDivNorm(one_qsnr, snr, &qsnr);
+ qsnr = DFRACT_BITS-1-qsnr;
+ snr = (qsnr > 30)? (snr>>(qsnr-30)):snr;
+
+ /* upper limit is -1 dB */
+ snr = (snr > MAX_SNR) ? MAX_SNR : snr;
+
+ /* lower limit is -25 dB */
+ snr = (snr < MIN_SNR) ? MIN_SNR : snr;
+ snr = snr << 1;
+
+ sfbMinSnrLdData[sfb] = CalcLdData(snr);
+ }
+}
+
+AAC_ENCODER_ERROR FDKaacEnc_InitPsyConfiguration(INT bitrate,
+ INT samplerate,
+ INT bandwidth,
+ INT blocktype,
+ INT granuleLength,
+ INT useIS,
+ PSY_CONFIGURATION *psyConf,
+ FB_TYPE filterbank)
+{
+ AAC_ENCODER_ERROR ErrorStatus;
+ INT sfb;
+ FIXP_DBL sfbBarcVal[MAX_SFB];
+ const INT frameLengthLong = granuleLength;
+ const INT frameLengthShort = granuleLength/TRANS_FAC;
+
+ FDKmemclear(psyConf, sizeof(PSY_CONFIGURATION));
+ psyConf->granuleLength = granuleLength;
+ psyConf->filterbank = filterbank;
+
+ psyConf->allowIS = (useIS) && ( (bitrate/bandwidth) < 5 );
+
+ /* init sfb table */
+ ErrorStatus = FDKaacEnc_initSfbTable(samplerate,blocktype,granuleLength,psyConf->sfbOffset,&psyConf->sfbCnt);
+ if (ErrorStatus != AAC_ENC_OK)
+ return ErrorStatus;
+
+ /* calculate barc values for each pb */
+ FDKaacEnc_initBarcValues(psyConf->sfbCnt,
+ psyConf->sfbOffset,
+ psyConf->sfbOffset[psyConf->sfbCnt],
+ samplerate,
+ sfbBarcVal);
+
+ FDKaacEnc_InitMinPCMResolution(psyConf->sfbCnt,
+ psyConf->sfbOffset,
+ psyConf->sfbPcmQuantThreshold);
+
+ /* calculate spreading function */
+ FDKaacEnc_initSpreading(psyConf->sfbCnt,
+ sfbBarcVal,
+ psyConf->sfbMaskLowFactor,
+ psyConf->sfbMaskHighFactor,
+ psyConf->sfbMaskLowFactorSprEn,
+ psyConf->sfbMaskHighFactorSprEn,
+ bitrate,
+ blocktype);
+
+ /* init ratio */
+
+ psyConf->maxAllowedIncreaseFactor = 2; /* integer */
+ psyConf->minRemainingThresholdFactor = (FIXP_SGL)0x0148; /* FL2FXCONST_SGL(0.01f); */ /* fract */
+
+ psyConf->clipEnergy = (FIXP_DBL)0x773593ff; /* FL2FXCONST_DBL(1.0e9*NORM_PCM_ENERGY); */
+
+ if (blocktype!=SHORT_WINDOW) {
+ psyConf->lowpassLine = (INT)((2*bandwidth*frameLengthLong)/samplerate);
+ psyConf->lowpassLineLFE = LFE_LOWPASS_LINE;
+ }
+ else {
+ psyConf->lowpassLine = (INT)((2*bandwidth*frameLengthShort)/samplerate);
+ psyConf->lowpassLineLFE = 0; /* LFE only in lonf blocks */
+ /* psyConf->clipEnergy /= (TRANS_FAC * TRANS_FAC); */
+ psyConf->clipEnergy >>= 6;
+ }
+
+ for (sfb = 0; sfb < psyConf->sfbCnt; sfb++){
+ if (psyConf->sfbOffset[sfb] >= psyConf->lowpassLine)
+ break;
+ }
+ psyConf->sfbActive = sfb;
+
+ for (sfb = 0; sfb < psyConf->sfbCnt; sfb++){
+ if (psyConf->sfbOffset[sfb] >= psyConf->lowpassLineLFE)
+ break;
+ }
+ psyConf->sfbActiveLFE = sfb;
+
+ /* calculate minSnr */
+ FDKaacEnc_initMinSnr(bitrate,
+ samplerate,
+ psyConf->sfbOffset[psyConf->sfbCnt],
+ psyConf->sfbOffset,
+ psyConf->sfbActive,
+ blocktype,
+ psyConf->sfbMinSnrLdData);
+
+ return AAC_ENC_OK;
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-29 00:46:51 +0000