/* ------------------------------------------------------------------ * Copyright (C) 1998-2009 PacketVideo * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either * express or implied. * See the License for the specific language governing permissions * and limitations under the License. * ------------------------------------------------------------------- */ /* Filename: sbr_reset_dec.c ------------------------------------------------------------------------------ REVISION HISTORY Who: Date: MM/DD/YYYY Description: ------------------------------------------------------------------------------ INPUT AND OUTPUT DEFINITIONS ------------------------------------------------------------------------------ FUNCTION DESCRIPTION resets sbr decoder structure ------------------------------------------------------------------------------ REQUIREMENTS ------------------------------------------------------------------------------ REFERENCES SC 29 Software Copyright Licencing Disclaimer: This software module was originally developed by Coding Technologies and edited by - in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards for reference purposes and its performance may not have been optimized. This software module is an implementation of one or more tools as specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards. ISO/IEC gives users free license to this software module or modifications thereof for use in products claiming conformance to audiovisual and image-coding related ITU Recommendations and/or ISO/IEC International Standards. ISO/IEC gives users the same free license to this software module or modifications thereof for research purposes and further ISO/IEC standardisation. Those intending to use this software module in products are advised that its use may infringe existing patents. ISO/IEC have no liability for use of this software module or modifications thereof. Copyright is not released for products that do not conform to audiovisual and image-coding related ITU Recommendations and/or ISO/IEC International Standards. The original developer retains full right to modify and use the code for its own purpose, assign or donate the code to a third party and to inhibit third parties from using the code for products that do not conform to audiovisual and image-coding related ITU Recommendations and/or ISO/IEC International Standards. This copyright notice must be included in all copies or derivative works. Copyright (c) ISO/IEC 2002. ------------------------------------------------------------------------------ PSEUDO-CODE ------------------------------------------------------------------------------ */ /*---------------------------------------------------------------------------- ; INCLUDES ----------------------------------------------------------------------------*/ #ifdef AAC_PLUS #include "sbr_dec.h" #include "pv_log2.h" #include "fxp_mul32.h" #include "sbr_reset_dec.h" #include "sbr_find_start_andstop_band.h" #include "sbr_update_freq_scale.h" #include "sbr_downsample_lo_res.h" /*---------------------------------------------------------------------------- ; MACROS ; Define module specific macros here ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; DEFINES ; Include all pre-processor statements here. Include conditional ; compile variables also. ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; LOCAL FUNCTION DEFINITIONS ; Function Prototype declaration ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; LOCAL STORE/BUFFER/POINTER DEFINITIONS ; Variable declaration - defined here and used outside this module ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; EXTERNAL FUNCTION REFERENCES ; Declare functions defined elsewhere and referenced in this module ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES ; Declare variables used in this module but defined elsewhere ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; FUNCTION CODE ----------------------------------------------------------------------------*/ SBR_ERROR sbr_reset_dec(SBR_FRAME_DATA * hFrameData, SBR_DEC * sbrDec, Int32 upsampleFac) { SBR_ERROR err = SBRDEC_OK; Int lsbM; Int lsb; Int usb; Int32 i; Int32 tmp_q1; SBR_HEADER_DATA *headerData = &(hFrameData->sbr_header); Int32 samplingFreq = sbrDec->outSampleRate; hFrameData->reset_flag = 1; /*Calculate master frequency function */ err = sbr_find_start_andstop_band(samplingFreq, headerData->startFreq, headerData->stopFreq, &lsbM, &usb); if (err != SBRDEC_OK) { return err; } /* Calculate new v_k_master if needed */ if (headerData->masterStatus == MASTER_RESET) { sbr_update_freq_scale(sbrDec->V_k_master, &(sbrDec->Num_Master), lsbM, usb, headerData->freqScale, headerData->alterScale, 0); } /*Derive Hiresolution from master frequency function*/ sbrDec->NSfb[HI] = sbrDec->Num_Master - headerData->xover_band; for (i = headerData->xover_band; i <= sbrDec->Num_Master; i++) { sbrDec->FreqBandTable[HI][i-headerData->xover_band] = (Int)sbrDec->V_k_master[i]; } if ((sbrDec->NSfb[HI] & 0x01) == 0) /* if even number of hires bands */ { sbrDec->NSfb[LO] = sbrDec->NSfb[HI] >> 1; /* Use every second lo-res=hi-res[0,2,4...] */ for (i = 0; i <= sbrDec->NSfb[LO]; i++) { sbrDec->FreqBandTable[LO][i] = sbrDec->FreqBandTable[HI][(i<<1)]; } } else { /* odd number of hi-res which means xover is odd */ sbrDec->NSfb[LO] = (sbrDec->NSfb[HI] + 1) >> 1; /* Use lo-res=hi-res[0,1,3,5 ...] */ sbrDec->FreqBandTable[LO][0] = sbrDec->FreqBandTable[HI][0]; for (i = 1; i <= sbrDec->NSfb[LO]; i++) { sbrDec->FreqBandTable[LO][i] = sbrDec->FreqBandTable[HI][(i<<1)-1]; } } lsb = sbrDec->FreqBandTable[LOW_RES][0]; usb = sbrDec->FreqBandTable[LOW_RES][sbrDec->NSfb[LOW_RES]]; sbrDec->lowSubband = lsb; sbrDec->highSubband = usb; sbrDec->noSubbands = usb - lsb; if ((lsb > 32) || (sbrDec->noSubbands <= 0)) { return SBRDEC_ILLEGAL_SCFACTORS; /* invalid bands */ } /* Calculate number of noise bands */ if (headerData->noise_bands == 0) { sbrDec->NoNoiseBands = 1; } else /* Calculate number of noise bands 1,2 or 3 bands/octave */ { if (! lsb) { return SBRDEC_ILLEGAL_SCFACTORS; /* avoid div by 0 */ } tmp_q1 = pv_log2((usb << 20) / lsb); tmp_q1 = fxp_mul32_Q15(headerData->noise_bands, tmp_q1); sbrDec->NoNoiseBands = (tmp_q1 + 16) >> 5; if (sbrDec->NoNoiseBands == 0) { sbrDec->NoNoiseBands = 1; } } headerData->noNoiseBands = sbrDec->NoNoiseBands; /* Get noise bands */ sbr_downsample_lo_res(sbrDec->FreqBandTableNoise, sbrDec->NoNoiseBands, sbrDec->FreqBandTable[LO], sbrDec->NSfb[LO]); sbrDec->sbStopCodec = sbrDec->lowSubband; if (sbrDec->sbStopCodec > (upsampleFac << 5)) { sbrDec->sbStopCodec = (upsampleFac << 5); } hFrameData->nSfb[LO] = sbrDec->NSfb[LO]; hFrameData->nSfb[HI] = sbrDec->NSfb[HI]; hFrameData->nNfb = hFrameData->sbr_header.noNoiseBands; hFrameData->offset = ((hFrameData->nSfb[LO]) << 1) - hFrameData->nSfb[HI]; return (SBRDEC_OK); } #endif