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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
+----------------------------------------------------------------------------------------------------------- */
+
+/*!
+ \file
+ \brief Envelope extraction
+ The functions provided by this module are mostly called by applySBR(). After it is
+ determined that there is valid SBR data, sbrGetHeaderData() might be called if the current
+ SBR data contains an \ref SBR_HEADER_ELEMENT as opposed to a \ref SBR_STANDARD_ELEMENT. This function
+ may return various error codes as defined in #SBR_HEADER_STATUS . Most importantly it returns HEADER_RESET when decoder
+ settings need to be recalculated according to the SBR specifications. In that case applySBR()
+ will initiatite the required re-configuration.
+
+ The header data is stored in a #SBR_HEADER_DATA structure.
+
+ The actual SBR data for the current frame is decoded into SBR_FRAME_DATA stuctures by sbrGetChannelPairElement()
+ [for stereo streams] and sbrGetSingleChannelElement() [for mono streams]. There is no fractional arithmetic involved.
+
+ Once the information is extracted, the data needs to be further prepared before the actual decoding process.
+ This is done in decodeSbrData().
+
+ \sa Description of buffer management in applySBR(). \ref documentationOverview
+
+ <h1>About the SBR data format:</h1>
+
+ Each frame includes SBR data (side chain information), and can be either the \ref SBR_HEADER_ELEMENT or the \ref SBR_STANDARD_ELEMENT.
+ Parts of the data can be protected by a CRC checksum.
+
+ \anchor SBR_HEADER_ELEMENT <h2>The SBR_HEADER_ELEMENT</h2>
+
+ The SBR_HEADER_ELEMENT can be transmitted with every frame, however, it typically is send every second or so. It contains fundamental
+ information such as SBR sampling frequency and frequency range as well as control signals that do not require frequent changes. It also
+ includes the \ref SBR_STANDARD_ELEMENT.
+
+ Depending on the changes between the information in a current SBR_HEADER_ELEMENT and the previous SBR_HEADER_ELEMENT, the SBR decoder might need
+ to be reset and reconfigured (e.g. new tables need to be calculated).
+
+ \anchor SBR_STANDARD_ELEMENT <h2>The SBR_STANDARD_ELEMENT</h2>
+
+ This data can be subdivided into "side info" and "raw data", where side info is defined as signals needed to decode the raw data
+ and some decoder tuning signals. Raw data is referred to as PCM and Huffman coded envelope and noise floor estimates. The side info also
+ includes information about the time-frequency grid for the current frame.
+
+ \sa \ref documentationOverview
+*/
+
+#include "env_extr.h"
+
+#include "sbr_ram.h"
+#include "sbr_rom.h"
+#include "huff_dec.h"
+
+
+#include "psbitdec.h"
+
+#define DRM_PARAMETRIC_STEREO 0
+#define EXTENSION_ID_PS_CODING 2
+
+
+static int extractFrameInfo (HANDLE_FDK_BITSTREAM hBs,
+ HANDLE_SBR_HEADER_DATA hHeaderData,
+ HANDLE_SBR_FRAME_DATA h_frame_data,
+ const UINT nrOfChannels,
+ const UINT flags
+ );
+
+
+static int sbrGetEnvelope (HANDLE_SBR_HEADER_DATA hHeaderData,
+ HANDLE_SBR_FRAME_DATA h_frame_data,
+ HANDLE_FDK_BITSTREAM hBs,
+ const UINT flags);
+
+static void sbrGetDirectionControlData (HANDLE_SBR_FRAME_DATA hFrameData,
+ HANDLE_FDK_BITSTREAM hBs);
+
+static void sbrGetNoiseFloorData (HANDLE_SBR_HEADER_DATA hHeaderData,
+ HANDLE_SBR_FRAME_DATA h_frame_data,
+ HANDLE_FDK_BITSTREAM hBs);
+
+static int checkFrameInfo (FRAME_INFO *pFrameInfo, int numberOfTimeSlots, int overlap, int timeStep);
+
+SBR_ERROR
+initHeaderData (
+ HANDLE_SBR_HEADER_DATA hHeaderData,
+ const int sampleRateIn,
+ const int sampleRateOut,
+ const int samplesPerFrame,
+ const UINT flags
+ )
+{
+ HANDLE_FREQ_BAND_DATA hFreq = &hHeaderData->freqBandData;
+ SBR_ERROR sbrError = SBRDEC_OK;
+ int numAnalysisBands;
+
+ if ( sampleRateIn == sampleRateOut ) {
+ hHeaderData->sbrProcSmplRate = sampleRateOut<<1;
+ numAnalysisBands = 32;
+ } else {
+ hHeaderData->sbrProcSmplRate = sampleRateOut;
+ if ( (sampleRateOut>>1) == sampleRateIn) {
+ /* 1:2 */
+ numAnalysisBands = 32;
+ } else if ( (sampleRateOut>>2) == sampleRateIn ) {
+ /* 1:4 */
+ numAnalysisBands = 32;
+ } else if ( (sampleRateOut*3)>>3 == (sampleRateIn*8)>>3 ) {
+ /* 3:8, 3/4 core frame length */
+ numAnalysisBands = 24;
+ } else {
+ sbrError = SBRDEC_UNSUPPORTED_CONFIG;
+ goto bail;
+ }
+ }
+
+ /* Fill in default values first */
+ hHeaderData->syncState = SBR_NOT_INITIALIZED;
+ hHeaderData->status = 0;
+ hHeaderData->frameErrorFlag = 0;
+
+ hHeaderData->bs_info.ampResolution = 1;
+ hHeaderData->bs_info.xover_band = 0;
+ hHeaderData->bs_info.sbr_preprocessing = 0;
+
+ hHeaderData->bs_data.startFreq = 5;
+ hHeaderData->bs_data.stopFreq = 0;
+ hHeaderData->bs_data.freqScale = 2;
+ hHeaderData->bs_data.alterScale = 1;
+ hHeaderData->bs_data.noise_bands = 2;
+ hHeaderData->bs_data.limiterBands = 2;
+ hHeaderData->bs_data.limiterGains = 2;
+ hHeaderData->bs_data.interpolFreq = 1;
+ hHeaderData->bs_data.smoothingLength = 1;
+
+ hHeaderData->timeStep = (flags & SBRDEC_ELD_GRID) ? 1 : 2;
+
+ /* Setup pointers to frequency band tables */
+ hFreq->freqBandTable[0] = hFreq->freqBandTableLo;
+ hFreq->freqBandTable[1] = hFreq->freqBandTableHi;
+
+ /* Patch some entries */
+ if (sampleRateOut > 24000) { /* Trigger an error if SBR is going to be processed without */
+ hHeaderData->bs_data.startFreq = 7; /* having read these frequency values from bit stream before. */
+ hHeaderData->bs_data.stopFreq = 3;
+ }
+
+ /* One SBR timeslot corresponds to the amount of samples equal to the amount of analysis bands, divided by the timestep. */
+ hHeaderData->numberTimeSlots = (samplesPerFrame/numAnalysisBands) >> (hHeaderData->timeStep - 1);
+ if (hHeaderData->numberTimeSlots > (16)) {
+ sbrError = SBRDEC_UNSUPPORTED_CONFIG;
+ }
+
+ hHeaderData->numberOfAnalysisBands = numAnalysisBands;
+
+bail:
+ return sbrError;
+}
+
+
+/*!
+ \brief Initialize the SBR_PREV_FRAME_DATA struct
+*/
+void
+initSbrPrevFrameData (HANDLE_SBR_PREV_FRAME_DATA h_prev_data, /*!< handle to struct SBR_PREV_FRAME_DATA */
+ int timeSlots) /*!< Framelength in SBR-timeslots */
+{
+ int i;
+
+ /* Set previous energy and noise levels to 0 for the case
+ that decoding starts in the middle of a bitstream */
+ for (i=0; i < MAX_FREQ_COEFFS; i++)
+ h_prev_data->sfb_nrg_prev[i] = (FIXP_DBL)0;
+ for (i=0; i < MAX_NOISE_COEFFS; i++)
+ h_prev_data->prevNoiseLevel[i] = (FIXP_DBL)0;
+ for (i=0; i < MAX_INVF_BANDS; i++)
+ h_prev_data->sbr_invf_mode[i] = INVF_OFF;
+
+ h_prev_data->stopPos = timeSlots;
+ h_prev_data->coupling = COUPLING_OFF;
+ h_prev_data->ampRes = 0;
+}
+
+
+/*!
+ \brief Read header data from bitstream
+
+ \return error status - 0 if ok
+*/
+SBR_HEADER_STATUS
+sbrGetHeaderData (HANDLE_SBR_HEADER_DATA hHeaderData,
+ HANDLE_FDK_BITSTREAM hBs,
+ const UINT flags,
+ const int fIsSbrData)
+{
+ SBR_HEADER_DATA_BS *pBsData;
+ SBR_HEADER_DATA_BS lastHeader;
+ SBR_HEADER_DATA_BS_INFO lastInfo;
+ int headerExtra1=0, headerExtra2=0;
+
+ /* Copy SBR bit stream header to temporary header */
+ lastHeader = hHeaderData->bs_data;
+ lastInfo = hHeaderData->bs_info;
+
+ /* Read new header from bitstream */
+ {
+ pBsData = &hHeaderData->bs_data;
+ }
+
+ {
+ hHeaderData->bs_info.ampResolution = FDKreadBits (hBs, 1);
+ }
+
+ pBsData->startFreq = FDKreadBits (hBs, 4);
+ pBsData->stopFreq = FDKreadBits (hBs, 4);
+
+ {
+ hHeaderData->bs_info.xover_band = FDKreadBits (hBs, 3);
+ FDKreadBits (hBs, 2);
+ }
+
+ headerExtra1 = FDKreadBits (hBs, 1);
+ headerExtra2 = FDKreadBits (hBs, 1);
+
+ /* Handle extra header information */
+ if( headerExtra1)
+ {
+ pBsData->freqScale = FDKreadBits (hBs, 2);
+ pBsData->alterScale = FDKreadBits (hBs, 1);
+ pBsData->noise_bands = FDKreadBits (hBs, 2);
+ }
+ else {
+ pBsData->freqScale = 2;
+ pBsData->alterScale = 1;
+ pBsData->noise_bands = 2;
+ }
+
+ if (headerExtra2) {
+ pBsData->limiterBands = FDKreadBits (hBs, 2);
+ pBsData->limiterGains = FDKreadBits (hBs, 2);
+ pBsData->interpolFreq = FDKreadBits (hBs, 1);
+ pBsData->smoothingLength = FDKreadBits (hBs, 1);
+ }
+ else {
+ pBsData->limiterBands = 2;
+ pBsData->limiterGains = 2;
+ pBsData->interpolFreq = 1;
+ pBsData->smoothingLength = 1;
+ }
+
+ /* Look for new settings. IEC 14496-3, 4.6.18.3.1 */
+ if(hHeaderData->syncState != SBR_ACTIVE ||
+ lastHeader.startFreq != pBsData->startFreq ||
+ lastHeader.stopFreq != pBsData->stopFreq ||
+ lastHeader.freqScale != pBsData->freqScale ||
+ lastHeader.alterScale != pBsData->alterScale ||
+ lastHeader.noise_bands != pBsData->noise_bands ||
+ lastInfo.xover_band != hHeaderData->bs_info.xover_band) {
+ return HEADER_RESET; /* New settings */
+ }
+
+ return HEADER_OK;
+}
+
+/*!
+ \brief Get missing harmonics parameters (only used for AAC+SBR)
+
+ \return error status - 0 if ok
+*/
+int
+sbrGetSyntheticCodedData(HANDLE_SBR_HEADER_DATA hHeaderData,
+ HANDLE_SBR_FRAME_DATA hFrameData,
+ HANDLE_FDK_BITSTREAM hBs)
+{
+ int i, bitsRead = 0;
+
+ int flag = FDKreadBits(hBs,1);
+ bitsRead++;
+
+ if(flag){
+ for(i=0;i<hHeaderData->freqBandData.nSfb[1];i++){
+ hFrameData->addHarmonics[i] = FDKreadBits (hBs, 1 );
+ bitsRead++;
+ }
+ }
+ else {
+ for(i=0; i<MAX_FREQ_COEFFS; i++)
+ hFrameData->addHarmonics[i] = 0;
+ }
+ return(bitsRead);
+}
+
+/*!
+ \brief Reads extension data from the bitstream
+
+ The bitstream format allows up to 4 kinds of extended data element.
+ Extended data may contain several elements, each identified by a 2-bit-ID.
+ So far, no extended data elements are defined hence the first 2 parameters
+ are unused. The data should be skipped in order to update the number
+ of read bits for the consistency check in applySBR().
+*/
+static int extractExtendedData(
+ HANDLE_SBR_HEADER_DATA hHeaderData, /*!< handle to SBR header */
+ HANDLE_FDK_BITSTREAM hBs /*!< Handle to the bit buffer */
+ ,HANDLE_PS_DEC hParametricStereoDec /*!< Parametric Stereo Decoder */
+ ) {
+ INT nBitsLeft;
+ int extended_data;
+ int i, frameOk = 1;
+
+
+ extended_data = FDKreadBits(hBs, 1);
+
+ if (extended_data) {
+ int cnt;
+ int bPsRead = 0;
+
+ cnt = FDKreadBits(hBs, 4);
+ if (cnt == (1<<4)-1)
+ cnt += FDKreadBits(hBs, 8);
+
+
+ nBitsLeft = 8 * cnt;
+
+ /* sanity check for cnt */
+ if (nBitsLeft > (INT)FDKgetValidBits(hBs)) {
+ /* limit nBitsLeft */
+ nBitsLeft = (INT)FDKgetValidBits(hBs);
+ /* set frame error */
+ frameOk = 0;
+ }
+
+ while (nBitsLeft > 7) {
+ int extension_id = FDKreadBits(hBs, 2);
+ nBitsLeft -= 2;
+
+ switch(extension_id) {
+
+
+
+ case EXTENSION_ID_PS_CODING:
+
+ /* Read PS data from bitstream */
+
+ if (hParametricStereoDec != NULL) {
+ if(bPsRead && !hParametricStereoDec->bsData[hParametricStereoDec->bsReadSlot].mpeg.bPsHeaderValid) {
+ cnt = nBitsLeft >> 3; /* number of remaining bytes */
+ for (i=0; i<cnt; i++)
+ FDKreadBits(hBs, 8);
+ nBitsLeft -= cnt * 8;
+ } else {
+ nBitsLeft -= ReadPsData(hParametricStereoDec, hBs, nBitsLeft);
+ bPsRead = 1;
+ }
+ }
+
+ /* parametric stereo detected, could set channelMode accordingly here */
+ /* */
+ /* "The usage of this parametric stereo extension to HE-AAC is */
+ /* signalled implicitly in the bitstream. Hence, if an sbr_extension() */
+ /* with bs_extension_id==EXTENSION_ID_PS is found in the SBR part of */
+ /* the bitstream, a decoder supporting the combination of SBR and PS */
+ /* shall operate the PS tool to generate a stereo output signal." */
+ /* source: ISO/IEC 14496-3:2001/FDAM 2:2004(E) */
+
+ break;
+
+
+ default:
+ cnt = nBitsLeft >> 3; /* number of remaining bytes */
+ for (i=0; i<cnt; i++)
+ FDKreadBits(hBs, 8);
+ nBitsLeft -= cnt * 8;
+ break;
+ }
+ }
+
+ if (nBitsLeft < 0) {
+ frameOk = 0;
+ goto bail;
+ }
+ else {
+ /* Read fill bits for byte alignment */
+ FDKreadBits(hBs, nBitsLeft);
+ }
+ }
+
+bail:
+ return (frameOk);
+}
+
+
+/*!
+ \brief Read bitstream elements of one channel
+
+ \return SbrFrameOK: 1=ok, 0=error
+*/
+int
+sbrGetSingleChannelElement (HANDLE_SBR_HEADER_DATA hHeaderData, /*!< Static control data */
+ HANDLE_SBR_FRAME_DATA hFrameData, /*!< Control data of current frame */
+ HANDLE_FDK_BITSTREAM hBs, /*!< Handle to struct BIT_BUF */
+ HANDLE_PS_DEC hParametricStereoDec, /*!< Handle to PS decoder */
+ const UINT flags,
+ const int overlap
+ )
+{
+ int i;
+
+
+ hFrameData->coupling = COUPLING_OFF;
+
+ {
+ /* Reserved bits */
+ if (FDKreadBits(hBs, 1)) { /* bs_data_extra */
+ FDKreadBits(hBs, 4);
+ if (flags & SBRDEC_SYNTAX_SCAL) {
+ FDKreadBits(hBs, 4);
+ }
+ }
+ }
+
+ if (flags & SBRDEC_SYNTAX_SCAL) {
+ FDKreadBits (hBs, 1); /* bs_coupling */
+ }
+
+ /*
+ Grid control
+ */
+ if ( !extractFrameInfo ( hBs, hHeaderData, hFrameData, 1, flags) )
+ return 0;
+
+ if ( !checkFrameInfo (&hFrameData->frameInfo, hHeaderData->numberTimeSlots, overlap, hHeaderData->timeStep) )
+ return 0;
+
+
+ /*
+ Fetch domain vectors (time or frequency direction for delta-coding)
+ */
+ sbrGetDirectionControlData (hFrameData, hBs);
+
+ for (i=0; i<hHeaderData->freqBandData.nInvfBands; i++) {
+ hFrameData->sbr_invf_mode[i] =
+ (INVF_MODE) FDKreadBits (hBs, 2);
+ }
+
+
+
+ /* raw data */
+ if ( !sbrGetEnvelope (hHeaderData, hFrameData, hBs, flags) )
+ return 0;
+
+
+ sbrGetNoiseFloorData (hHeaderData, hFrameData, hBs);
+
+ sbrGetSyntheticCodedData(hHeaderData, hFrameData, hBs);
+
+ {
+ /* sbr extended data */
+ if (! extractExtendedData(
+ hHeaderData,
+ hBs
+ ,hParametricStereoDec
+ )) {
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+
+
+/*!
+ \brief Read bitstream elements of a channel pair
+ \return SbrFrameOK
+*/
+int
+sbrGetChannelPairElement (HANDLE_SBR_HEADER_DATA hHeaderData, /*!< Static control data */
+ HANDLE_SBR_FRAME_DATA hFrameDataLeft, /*!< Dynamic control data for first channel */
+ HANDLE_SBR_FRAME_DATA hFrameDataRight,/*!< Dynamic control data for second channel */
+ HANDLE_FDK_BITSTREAM hBs, /*!< handle to struct BIT_BUF */
+ const UINT flags,
+ const int overlap )
+{
+ int i, bit;
+
+
+ /* Reserved bits */
+ if (FDKreadBits(hBs, 1)) { /* bs_data_extra */
+ FDKreadBits(hBs, 4);
+ FDKreadBits(hBs, 4);
+ }
+
+ /* Read coupling flag */
+ bit = FDKreadBits (hBs, 1);
+
+ if (bit) {
+ hFrameDataLeft->coupling = COUPLING_LEVEL;
+ hFrameDataRight->coupling = COUPLING_BAL;
+ }
+ else {
+ hFrameDataLeft->coupling = COUPLING_OFF;
+ hFrameDataRight->coupling = COUPLING_OFF;
+ }
+
+
+ /*
+ Grid control
+ */
+ if ( !extractFrameInfo (hBs, hHeaderData, hFrameDataLeft, 2, flags) )
+ return 0;
+
+ if ( !checkFrameInfo (&hFrameDataLeft->frameInfo, hHeaderData->numberTimeSlots, overlap, hHeaderData->timeStep) )
+ return 0;
+
+ if (hFrameDataLeft->coupling) {
+ FDKmemcpy (&hFrameDataRight->frameInfo, &hFrameDataLeft->frameInfo, sizeof(FRAME_INFO));
+ hFrameDataRight->ampResolutionCurrentFrame = hFrameDataLeft->ampResolutionCurrentFrame;
+ }
+ else {
+ if ( !extractFrameInfo (hBs, hHeaderData, hFrameDataRight, 2, flags) )
+ return 0;
+
+ if ( !checkFrameInfo (&hFrameDataRight->frameInfo, hHeaderData->numberTimeSlots, overlap, hHeaderData->timeStep) )
+ return 0;
+ }
+
+ /*
+ Fetch domain vectors (time or frequency direction for delta-coding)
+ */
+ sbrGetDirectionControlData (hFrameDataLeft, hBs);
+ sbrGetDirectionControlData (hFrameDataRight, hBs);
+
+ for (i=0; i<hHeaderData->freqBandData.nInvfBands; i++) {
+ hFrameDataLeft->sbr_invf_mode[i] = (INVF_MODE) FDKreadBits (hBs, 2);
+ }
+
+ if (hFrameDataLeft->coupling) {
+ for (i=0; i<hHeaderData->freqBandData.nInvfBands; i++) {
+ hFrameDataRight->sbr_invf_mode[i] = hFrameDataLeft->sbr_invf_mode[i];
+ }
+
+
+ if ( !sbrGetEnvelope (hHeaderData, hFrameDataLeft, hBs, flags) ) {
+ return 0;
+ }
+
+ sbrGetNoiseFloorData (hHeaderData, hFrameDataLeft, hBs);
+
+ if ( !sbrGetEnvelope (hHeaderData, hFrameDataRight, hBs, flags) ) {
+ return 0;
+ }
+ }
+ else {
+
+ for (i=0; i<hHeaderData->freqBandData.nInvfBands; i++) {
+ hFrameDataRight->sbr_invf_mode[i] = (INVF_MODE) FDKreadBits (hBs, 2);
+ }
+
+
+
+ if ( !sbrGetEnvelope (hHeaderData, hFrameDataLeft, hBs, flags) )
+ return 0;
+
+ if ( !sbrGetEnvelope (hHeaderData, hFrameDataRight, hBs, flags) )
+ return 0;
+
+ sbrGetNoiseFloorData (hHeaderData, hFrameDataLeft, hBs);
+
+ }
+ sbrGetNoiseFloorData (hHeaderData, hFrameDataRight, hBs);
+
+ sbrGetSyntheticCodedData(hHeaderData, hFrameDataLeft, hBs);
+ sbrGetSyntheticCodedData(hHeaderData, hFrameDataRight, hBs);
+
+ {
+ if (! extractExtendedData(
+ hHeaderData,
+ hBs
+ ,NULL
+ ) ) {
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+
+
+
+/*!
+ \brief Read direction control data from bitstream
+*/
+void
+sbrGetDirectionControlData (HANDLE_SBR_FRAME_DATA h_frame_data, /*!< handle to struct SBR_FRAME_DATA */
+ HANDLE_FDK_BITSTREAM hBs) /*!< handle to struct BIT_BUF */
+{
+ int i;
+
+ for (i = 0; i < h_frame_data->frameInfo.nEnvelopes; i++) {
+ h_frame_data->domain_vec[i] = FDKreadBits (hBs, 1);
+ }
+
+ for (i = 0; i < h_frame_data->frameInfo.nNoiseEnvelopes; i++) {
+ h_frame_data->domain_vec_noise[i] = FDKreadBits (hBs, 1);
+ }
+}
+
+
+
+/*!
+ \brief Read noise-floor-level data from bitstream
+*/
+void
+sbrGetNoiseFloorData (HANDLE_SBR_HEADER_DATA hHeaderData, /*!< Static control data */
+ HANDLE_SBR_FRAME_DATA h_frame_data, /*!< handle to struct SBR_FRAME_DATA */
+ HANDLE_FDK_BITSTREAM hBs) /*!< handle to struct BIT_BUF */
+{
+ int i,j;
+ int delta;
+ COUPLING_MODE coupling;
+ int noNoiseBands = hHeaderData->freqBandData.nNfb;
+
+ Huffman hcb_noiseF;
+ Huffman hcb_noise;
+ int envDataTableCompFactor;
+
+ coupling = h_frame_data->coupling;
+
+
+ /*
+ Select huffman codebook depending on coupling mode
+ */
+ if (coupling == COUPLING_BAL) {
+ hcb_noise = (Huffman)&FDK_sbrDecoder_sbr_huffBook_NoiseBalance11T;
+ hcb_noiseF = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvBalance11F; /* "sbr_huffBook_NoiseBalance11F" */
+ envDataTableCompFactor = 1;
+ }
+ else {
+ hcb_noise = (Huffman)&FDK_sbrDecoder_sbr_huffBook_NoiseLevel11T;
+ hcb_noiseF = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvLevel11F; /* "sbr_huffBook_NoiseLevel11F" */
+ envDataTableCompFactor = 0;
+ }
+
+ /*
+ Read raw noise-envelope data
+ */
+ for (i=0; i<h_frame_data->frameInfo.nNoiseEnvelopes; i++) {
+
+
+ if (h_frame_data->domain_vec_noise[i] == 0) {
+ if (coupling == COUPLING_BAL) {
+ h_frame_data->sbrNoiseFloorLevel[i*noNoiseBands] =
+ (FIXP_SGL) (((int)FDKreadBits (hBs, 5)) << envDataTableCompFactor);
+ }
+ else {
+ h_frame_data->sbrNoiseFloorLevel[i*noNoiseBands] =
+ (FIXP_SGL) (int)FDKreadBits (hBs, 5);
+ }
+
+ for (j = 1; j < noNoiseBands; j++) {
+ delta = DecodeHuffmanCW(hcb_noiseF, hBs);
+ h_frame_data->sbrNoiseFloorLevel[i*noNoiseBands+j] = (FIXP_SGL) (delta << envDataTableCompFactor);
+ }
+ }
+ else {
+ for (j = 0; j < noNoiseBands; j++) {
+ delta = DecodeHuffmanCW(hcb_noise, hBs);
+ h_frame_data->sbrNoiseFloorLevel[i*noNoiseBands+j] = (FIXP_SGL) (delta << envDataTableCompFactor);
+ }
+ }
+ }
+}
+
+
+/*!
+ \brief Read envelope data from bitstream
+*/
+static int
+sbrGetEnvelope (HANDLE_SBR_HEADER_DATA hHeaderData, /*!< Static control data */
+ HANDLE_SBR_FRAME_DATA h_frame_data, /*!< handle to struct SBR_FRAME_DATA */
+ HANDLE_FDK_BITSTREAM hBs, /*!< handle to struct BIT_BUF */
+ const UINT flags)
+{
+ int i, j;
+ UCHAR no_band[MAX_ENVELOPES];
+ int delta = 0;
+ int offset = 0;
+ COUPLING_MODE coupling = h_frame_data->coupling;
+ int ampRes = hHeaderData->bs_info.ampResolution;
+ int nEnvelopes = h_frame_data->frameInfo.nEnvelopes;
+ int envDataTableCompFactor;
+ int start_bits, start_bits_balance;
+ Huffman hcb_t, hcb_f;
+
+ h_frame_data->nScaleFactors = 0;
+
+ if ( (h_frame_data->frameInfo.frameClass == 0) && (nEnvelopes == 1) ) {
+ if (flags & SBRDEC_ELD_GRID)
+ ampRes = h_frame_data->ampResolutionCurrentFrame;
+ else
+ ampRes = 0;
+ }
+ h_frame_data->ampResolutionCurrentFrame = ampRes;
+
+ /*
+ Set number of bits for first value depending on amplitude resolution
+ */
+ if(ampRes == 1)
+ {
+ start_bits = 6;
+ start_bits_balance = 5;
+ }
+ else
+ {
+ start_bits = 7;
+ start_bits_balance = 6;
+ }
+
+ /*
+ Calculate number of values for each envelope and alltogether
+ */
+ for (i = 0; i < nEnvelopes; i++) {
+ no_band[i] = hHeaderData->freqBandData.nSfb[h_frame_data->frameInfo.freqRes[i]];
+ h_frame_data->nScaleFactors += no_band[i];
+ }
+ if (h_frame_data->nScaleFactors > MAX_NUM_ENVELOPE_VALUES)
+ return 0;
+
+ /*
+ Select Huffman codebook depending on coupling mode and amplitude resolution
+ */
+ if (coupling == COUPLING_BAL) {
+ envDataTableCompFactor = 1;
+ if (ampRes == 0) {
+ hcb_t = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvBalance10T;
+ hcb_f = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvBalance10F;
+ }
+ else {
+ hcb_t = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvBalance11T;
+ hcb_f = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvBalance11F;
+ }
+ }
+ else {
+ envDataTableCompFactor = 0;
+ if (ampRes == 0) {
+ hcb_t = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvLevel10T;
+ hcb_f = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvLevel10F;
+ }
+ else {
+ hcb_t = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvLevel11T;
+ hcb_f = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvLevel11F;
+ }
+ }
+
+ /*
+ Now read raw envelope data
+ */
+ for (j = 0, offset = 0; j < nEnvelopes; j++) {
+
+
+ if (h_frame_data->domain_vec[j] == 0) {
+ if (coupling == COUPLING_BAL) {
+ h_frame_data->iEnvelope[offset] =
+ (FIXP_SGL) (( (int)FDKreadBits(hBs, start_bits_balance)) << envDataTableCompFactor);
+ }
+ else {
+ h_frame_data->iEnvelope[offset] =
+ (FIXP_SGL) (int)FDKreadBits (hBs, start_bits);
+ }
+ }
+
+ for (i = (1 - h_frame_data->domain_vec[j]); i < no_band[j]; i++) {
+
+ if (h_frame_data->domain_vec[j] == 0) {
+ delta = DecodeHuffmanCW(hcb_f, hBs);
+ }
+ else {
+ delta = DecodeHuffmanCW(hcb_t, hBs);
+ }
+
+ h_frame_data->iEnvelope[offset + i] = (FIXP_SGL) (delta << envDataTableCompFactor);
+ }
+ offset += no_band[j];
+ }
+
+#if ENV_EXP_FRACT
+ /* Convert from int to scaled fract (ENV_EXP_FRACT bits for the fractional part) */
+ for (i = 0; i < h_frame_data->nScaleFactors; i++) {
+ h_frame_data->iEnvelope[i] <<= ENV_EXP_FRACT;
+ }
+#endif
+
+ return 1;
+}
+
+
+//static const FRAME_INFO v_frame_info1_8 = { 0, 1, {0, 8}, {1}, -1, 1, {0, 8} };
+static const FRAME_INFO v_frame_info2_8 = { 0, 2, {0, 4, 8}, {1, 1}, -1, 2, {0, 4, 8} };
+static const FRAME_INFO v_frame_info4_8 = { 0, 4, {0, 2, 4, 6, 8}, {1, 1, 1, 1}, -1, 2, {0, 4, 8} };
+
+/***************************************************************************/
+/*!
+ \brief Generates frame info for FIXFIXonly frame class used for low delay version
+
+ \return nothing
+ ****************************************************************************/
+ static void generateFixFixOnly ( FRAME_INFO *hSbrFrameInfo,
+ int tranPosInternal,
+ int numberTimeSlots
+ )
+{
+ int nEnv, i, tranIdx;
+ const int *pTable;
+
+ switch (numberTimeSlots) {
+ case 8:
+ pTable = FDK_sbrDecoder_envelopeTable_8[tranPosInternal];
+ break;
+ case 15:
+ pTable = FDK_sbrDecoder_envelopeTable_15[tranPosInternal];
+ break;
+ case 16:
+ pTable = FDK_sbrDecoder_envelopeTable_16[tranPosInternal];
+ break;
+ default:
+ FDK_ASSERT(0);
+ }
+
+ /* look number of envelopes in table */
+ nEnv = pTable[0];
+ /* look up envelope distribution in table */
+ for (i=1; i<nEnv; i++)
+ hSbrFrameInfo->borders[i] = pTable[i+2];
+ /* open and close frame border */
+ hSbrFrameInfo->borders[0] = 0;
+ hSbrFrameInfo->borders[nEnv] = numberTimeSlots;
+ hSbrFrameInfo->nEnvelopes = nEnv;
+
+ /* transient idx */
+ tranIdx = hSbrFrameInfo->tranEnv = pTable[1];
+
+ /* add noise floors */
+ hSbrFrameInfo->bordersNoise[0] = 0;
+ hSbrFrameInfo->bordersNoise[1] = hSbrFrameInfo->borders[tranIdx?tranIdx:1];
+ hSbrFrameInfo->bordersNoise[2] = numberTimeSlots;
+ /* nEnv is always > 1, so nNoiseEnvelopes is always 2 (IEC 14496-3 4.6.19.3.2) */
+ hSbrFrameInfo->nNoiseEnvelopes = 2;
+}
+
+/*!
+ \brief Extracts LowDelaySBR control data from the bitstream.
+
+ \return zero for bitstream error, one for correct.
+*/
+static int
+extractLowDelayGrid (HANDLE_FDK_BITSTREAM hBitBuf, /*!< bitbuffer handle */
+ HANDLE_SBR_HEADER_DATA hHeaderData,
+ HANDLE_SBR_FRAME_DATA h_frame_data, /*!< contains the FRAME_INFO struct to be filled */
+ int timeSlots
+ )
+{
+ FRAME_INFO * pFrameInfo = &h_frame_data->frameInfo;
+ INT numberTimeSlots = hHeaderData->numberTimeSlots;
+ INT temp = 0, k;
+
+ /* FIXFIXonly framing case */
+ h_frame_data->frameInfo.frameClass = 0;
+
+ /* get the transient position from the bitstream */
+ switch (timeSlots){
+ case 8:
+ /* 3bit transient position (temp={0;..;7}) */
+ temp = FDKreadBits( hBitBuf, 3);
+ break;
+
+ case 16:
+ case 15:
+ /* 4bit transient position (temp={0;..;15}) */
+ temp = FDKreadBits( hBitBuf, 4);
+ break;
+
+ default:
+ return 0;
+ }
+
+ /* calculate borders according to the transient position */
+ generateFixFixOnly ( pFrameInfo,
+ temp,
+ numberTimeSlots
+ );
+
+ /* decode freq res: */
+ for (k = 0; k < pFrameInfo->nEnvelopes; k++) {
+ pFrameInfo->freqRes[k] = (UCHAR) FDKreadBits (hBitBuf, 1); /* f = F [1 bits] */
+ }
+
+
+ return 1;
+}
+
+/*!
+ \brief Extract the frame information (structure FRAME_INFO) from the bitstream
+ \return Zero for bitstream error, one for correct.
+*/
+int
+extractFrameInfo ( HANDLE_FDK_BITSTREAM hBs, /*!< bitbuffer handle */
+ HANDLE_SBR_HEADER_DATA hHeaderData, /*!< Static control data */
+ HANDLE_SBR_FRAME_DATA h_frame_data, /*!< pointer to memory where the frame-info will be stored */
+ const UINT nrOfChannels,
+ const UINT flags
+ )
+{
+ FRAME_INFO * pFrameInfo = &h_frame_data->frameInfo;
+ int numberTimeSlots = hHeaderData->numberTimeSlots;
+ int pointer_bits = 0, nEnv = 0, b = 0, border, i, n = 0,
+ k, p, aL, aR, nL, nR,
+ temp = 0, staticFreqRes;
+ UCHAR frameClass;
+
+ if (flags & SBRDEC_ELD_GRID) {
+ /* CODEC_AACLD (LD+SBR) only uses the normal 0 Grid for non-transient Frames and the LowDelayGrid for transient Frames */
+ frameClass = FDKreadBits (hBs, 1); /* frameClass = [1 bit] */
+ if ( frameClass == 1 ) {
+ /* if frameClass == 1, extract LowDelaySbrGrid, otherwise extract normal SBR-Grid for FIXIFX */
+ /* extract the AACLD-Sbr-Grid */
+ pFrameInfo->frameClass = frameClass;
+ extractLowDelayGrid (hBs, hHeaderData, h_frame_data, numberTimeSlots);
+ return 1;
+ }
+ } else
+ {
+ frameClass = FDKreadBits (hBs, 2); /* frameClass = C [2 bits] */
+ }
+
+
+ switch (frameClass) {
+ case 0:
+ temp = FDKreadBits (hBs, 2); /* E [2 bits ] */
+ nEnv = (int) (1 << temp); /* E -> e */
+
+ if ((flags & SBRDEC_ELD_GRID) && (nEnv == 1))
+ h_frame_data->ampResolutionCurrentFrame = FDKreadBits( hBs, 1); /* new ELD Syntax 07-11-09 */
+
+ staticFreqRes = FDKreadBits (hBs, 1);
+
+ {
+ if (nEnv > MAX_ENVELOPES_HEAAC)
+ return 0;
+ }
+
+ b = nEnv + 1;
+ switch (nEnv) {
+ case 1:
+ switch (numberTimeSlots) {
+ case 15:
+ FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info1_15, sizeof(FRAME_INFO));
+ break;
+ case 16:
+ FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info1_16, sizeof(FRAME_INFO));
+ break;
+ default:
+ FDK_ASSERT(0);
+ }
+ break;
+ case 2:
+ switch (numberTimeSlots) {
+ case 15:
+ FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info2_15, sizeof(FRAME_INFO));
+ break;
+ case 16:
+ FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info2_16, sizeof(FRAME_INFO));
+ break;
+ default:
+ FDK_ASSERT(0);
+ }
+ break;
+ case 4:
+ switch (numberTimeSlots) {
+ case 15:
+ FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info4_15, sizeof(FRAME_INFO));
+ break;
+ case 16:
+ FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info4_16, sizeof(FRAME_INFO));
+ break;
+ default:
+ FDK_ASSERT(0);
+ }
+ break;
+ case 8:
+#if (MAX_ENVELOPES >= 8)
+ switch (numberTimeSlots) {
+ case 15:
+ FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info8_15, sizeof(FRAME_INFO));
+ break;
+ case 16:
+ FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info8_16, sizeof(FRAME_INFO));
+ break;
+ default:
+ FDK_ASSERT(0);
+ }
+ break;
+#else
+ return 0;
+#endif
+ }
+ /* Apply correct freqRes (High is default) */
+ if (!staticFreqRes) {
+ for (i = 0; i < nEnv ; i++)
+ pFrameInfo->freqRes[i] = 0;
+ }
+
+ break;
+ case 1:
+ case 2:
+ temp = FDKreadBits (hBs, 2); /* A [2 bits] */
+
+ n = FDKreadBits (hBs, 2); /* n = N [2 bits] */
+
+ nEnv = n + 1; /* # envelopes */
+ b = nEnv + 1; /* # borders */
+
+ break;
+ }
+
+ switch (frameClass) {
+ case 1:
+ /* Decode borders: */
+ pFrameInfo->borders[0] = 0; /* first border */
+ border = temp + numberTimeSlots; /* A -> aR */
+ i = b-1; /* frame info index for last border */
+ pFrameInfo->borders[i] = border; /* last border */
+
+ for (k = 0; k < n; k++) {
+ temp = FDKreadBits (hBs, 2);/* R [2 bits] */
+ border -= (2 * temp + 2); /* R -> r */
+ pFrameInfo->borders[--i] = border;
+ }
+
+
+ /* Decode pointer: */
+ pointer_bits = DFRACT_BITS - 1 - CountLeadingBits((FIXP_DBL)(n+1));
+ p = FDKreadBits (hBs, pointer_bits); /* p = P [pointer_bits bits] */
+
+ if (p > n+1)
+ return 0;
+
+ pFrameInfo->tranEnv = p ? n + 2 - p : -1;
+
+
+ /* Decode freq res: */
+ for (k = n; k >= 0; k--) {
+ pFrameInfo->freqRes[k] = FDKreadBits (hBs, 1); /* f = F [1 bits] */
+ }
+
+
+ /* Calculate noise floor middle border: */
+ if (p == 0 || p == 1)
+ pFrameInfo->bordersNoise[1] = pFrameInfo->borders[n];
+ else
+ pFrameInfo->bordersNoise[1] = pFrameInfo->borders[pFrameInfo->tranEnv];
+
+ break;
+
+ case 2:
+ /* Decode borders: */
+ border = temp; /* A -> aL */
+ pFrameInfo->borders[0] = border; /* first border */
+
+ for (k = 1; k <= n; k++) {
+ temp = FDKreadBits (hBs, 2);/* R [2 bits] */
+ border += (2 * temp + 2); /* R -> r */
+ pFrameInfo->borders[k] = border;
+ }
+ pFrameInfo->borders[k] = numberTimeSlots; /* last border */
+
+
+ /* Decode pointer: */
+ pointer_bits = DFRACT_BITS - 1 - CountLeadingBits((FIXP_DBL)(n+1));
+ p = FDKreadBits (hBs, pointer_bits); /* p = P [pointer_bits bits] */
+ if (p > n+1)
+ return 0;
+
+ if (p == 0 || p == 1)
+ pFrameInfo->tranEnv = -1;
+ else
+ pFrameInfo->tranEnv = p - 1;
+
+
+
+ /* Decode freq res: */
+ for (k = 0; k <= n; k++) {
+ pFrameInfo->freqRes[k] = FDKreadBits(hBs, 1); /* f = F [1 bits] */
+ }
+
+
+
+ /* Calculate noise floor middle border: */
+ switch (p) {
+ case 0:
+ pFrameInfo->bordersNoise[1] = pFrameInfo->borders[1];
+ break;
+ case 1:
+ pFrameInfo->bordersNoise[1] = pFrameInfo->borders[n];
+ break;
+ default:
+ pFrameInfo->bordersNoise[1] = pFrameInfo->borders[pFrameInfo->tranEnv];
+ break;
+ }
+
+ break;
+
+ case 3:
+ /* v_ctrlSignal = [frameClass,aL,aR,nL,nR,v_rL,v_rR,p,v_fLR]; */
+
+ aL = FDKreadBits (hBs, 2); /* AL [2 bits], AL -> aL */
+
+ aR = FDKreadBits (hBs, 2) + numberTimeSlots; /* AR [2 bits], AR -> aR */
+
+ nL = FDKreadBits (hBs, 2); /* nL = NL [2 bits] */
+
+ nR = FDKreadBits (hBs, 2); /* nR = NR [2 bits] */
+
+
+
+ /*-------------------------------------------------------------------------
+ Calculate help variables
+ --------------------------------------------------------------------------*/
+
+ /* general: */
+ nEnv = nL + nR + 1; /* # envelopes */
+ if (nEnv > MAX_ENVELOPES)
+ return 0;
+ b = nEnv + 1; /* # borders */
+
+
+
+ /*-------------------------------------------------------------------------
+ Decode envelopes
+ --------------------------------------------------------------------------*/
+
+
+ /* L-borders: */
+ border = aL; /* first border */
+ pFrameInfo->borders[0] = border;
+
+ for (k = 1; k <= nL; k++) {
+ temp = FDKreadBits (hBs, 2);/* R [2 bits] */
+ border += (2 * temp + 2); /* R -> r */
+ pFrameInfo->borders[k] = border;
+ }
+
+
+ /* R-borders: */
+ border = aR; /* last border */
+ i = nEnv;
+
+ pFrameInfo->borders[i] = border;
+
+ for (k = 0; k < nR; k++) {
+ temp = FDKreadBits (hBs, 2);/* R [2 bits] */
+ border -= (2 * temp + 2); /* R -> r */
+ pFrameInfo->borders[--i] = border;
+ }
+
+
+ /* decode pointer: */
+ pointer_bits = DFRACT_BITS - 1 - CountLeadingBits((FIXP_DBL)(nL+nR+1));
+ p = FDKreadBits (hBs, pointer_bits); /* p = P [pointer_bits bits] */
+
+ if (p > nL+nR+1)
+ return 0;
+
+ pFrameInfo->tranEnv = p ? b - p : -1;
+
+
+
+ /* decode freq res: */
+ for (k = 0; k < nEnv; k++) {
+ pFrameInfo->freqRes[k] = FDKreadBits(hBs, 1); /* f = F [1 bits] */
+ }
+
+
+
+ /*-------------------------------------------------------------------------
+ Decode noise floors
+ --------------------------------------------------------------------------*/
+ pFrameInfo->bordersNoise[0] = aL;
+
+ if (nEnv == 1) {
+ /* 1 noise floor envelope: */
+ pFrameInfo->bordersNoise[1] = aR;
+ }
+ else {
+ /* 2 noise floor envelopes */
+ if (p == 0 || p == 1)
+ pFrameInfo->bordersNoise[1] = pFrameInfo->borders[nEnv - 1];
+ else
+ pFrameInfo->bordersNoise[1] = pFrameInfo->borders[pFrameInfo->tranEnv];
+ pFrameInfo->bordersNoise[2] = aR;
+ }
+ break;
+ }
+
+
+ /*
+ Store number of envelopes, noise floor envelopes and frame class
+ */
+ pFrameInfo->nEnvelopes = nEnv;
+
+ if (nEnv == 1)
+ pFrameInfo->nNoiseEnvelopes = 1;
+ else
+ pFrameInfo->nNoiseEnvelopes = 2;
+
+ pFrameInfo->frameClass = frameClass;
+
+ if (pFrameInfo->frameClass == 2 || pFrameInfo->frameClass == 1) {
+ /* calculate noise floor first and last borders: */
+ pFrameInfo->bordersNoise[0] = pFrameInfo->borders[0];
+ pFrameInfo->bordersNoise[pFrameInfo->nNoiseEnvelopes] = pFrameInfo->borders[nEnv];
+ }
+
+
+ return 1;
+}
+
+
+/*!
+ \brief Check if the frameInfo vector has reasonable values.
+ \return Zero for error, one for correct
+*/
+static int
+checkFrameInfo (FRAME_INFO * pFrameInfo, /*!< pointer to frameInfo */
+ int numberOfTimeSlots, /*!< QMF time slots per frame */
+ int overlap, /*!< Amount of overlap QMF time slots */
+ int timeStep) /*!< QMF slots to SBR slots step factor */
+{
+ int maxPos,i,j;
+ int startPos;
+ int stopPos;
+ int tranEnv;
+ int startPosNoise;
+ int stopPosNoise;
+ int nEnvelopes = pFrameInfo->nEnvelopes;
+ int nNoiseEnvelopes = pFrameInfo->nNoiseEnvelopes;
+
+ if(nEnvelopes < 1 || nEnvelopes > MAX_ENVELOPES)
+ return 0;
+
+ if(nNoiseEnvelopes > MAX_NOISE_ENVELOPES)
+ return 0;
+
+ startPos = pFrameInfo->borders[0];
+ stopPos = pFrameInfo->borders[nEnvelopes];
+ tranEnv = pFrameInfo->tranEnv;
+ startPosNoise = pFrameInfo->bordersNoise[0];
+ stopPosNoise = pFrameInfo->bordersNoise[nNoiseEnvelopes];
+
+ if (overlap < 0 || overlap > (6)) {
+ return 0;
+ }
+ if (timeStep < 1 || timeStep > 2) {
+ return 0;
+ }
+ maxPos = numberOfTimeSlots + (overlap/timeStep);
+
+ /* Check that the start and stop positions of the frame are reasonable values. */
+ if( (startPos < 0) || (startPos >= stopPos) )
+ return 0;
+ if( startPos > maxPos-numberOfTimeSlots ) /* First env. must start in or directly after the overlap buffer */
+ return 0;
+ if( stopPos < numberOfTimeSlots ) /* One complete frame must be ready for output after processing */
+ return 0;
+ if(stopPos > maxPos)
+ return 0;
+
+ /* Check that the start border for every envelope is strictly later in time */
+ for(i=0;i<nEnvelopes;i++) {
+ if(pFrameInfo->borders[i] >= pFrameInfo->borders[i+1])
+ return 0;
+ }
+
+ /* Check that the envelope to be shortened is actually among the envelopes */
+ if(tranEnv>nEnvelopes)
+ return 0;
+
+
+ /* Check the noise borders */
+ if(nEnvelopes==1 && nNoiseEnvelopes>1)
+ return 0;
+
+ if(startPos != startPosNoise || stopPos != stopPosNoise)
+ return 0;
+
+
+ /* Check that the start border for every noise-envelope is strictly later in time*/
+ for(i=0; i<nNoiseEnvelopes; i++) {
+ if(pFrameInfo->bordersNoise[i] >= pFrameInfo->bordersNoise[i+1])
+ return 0;
+ }
+
+ /* Check that every noise border is the same as an envelope border*/
+ for(i=0; i<nNoiseEnvelopes; i++) {
+ startPosNoise = pFrameInfo->bordersNoise[i];
+
+ for(j=0; j<nEnvelopes; j++) {
+ if(pFrameInfo->borders[j] == startPosNoise)
+ break;
+ }
+ if(j==nEnvelopes)
+ return 0;
+ }
+
+ return 1;
+}