| /* ------------------------------------------------------------------ |
| * 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 |
| |