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Diffstat (limited to 'media/libstagefright/codecs/aacdec/sbr_reset_dec.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/sbr_reset_dec.cpp | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/sbr_reset_dec.cpp b/media/libstagefright/codecs/aacdec/sbr_reset_dec.cpp new file mode 100644 index 0000000..810a34a --- /dev/null +++ b/media/libstagefright/codecs/aacdec/sbr_reset_dec.cpp @@ -0,0 +1,269 @@ +/* ------------------------------------------------------------------ + * 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 + |