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Diffstat (limited to 'libAACdec/src/channel.cpp')
| -rw-r--r-- | libAACdec/src/channel.cpp | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/libAACdec/src/channel.cpp b/libAACdec/src/channel.cpp new file mode 100644 index 0000000..3e1ffb6 --- /dev/null +++ b/libAACdec/src/channel.cpp @@ -0,0 +1,389 @@ +/***************************** MPEG-4 AAC Decoder ************************** + + (C) Copyright Fraunhofer IIS (2004) + All Rights Reserved + + Please be advised that this software and/or program delivery is + Confidential Information of Fraunhofer and subject to and covered by the + + Fraunhofer IIS Software Evaluation Agreement + between Google Inc. and Fraunhofer + effective and in full force since March 1, 2012. + + You may use this software and/or program only under the terms and + conditions described in the above mentioned Fraunhofer IIS Software + Evaluation Agreement. Any other and/or further use requires a separate agreement. + + + $Id$ + Author(s): Josef Hoepfl + Description: + + This software and/or program is protected by copyright law and international + treaties. Any reproduction or distribution of this software and/or program, + or any portion of it, may result in severe civil and criminal penalties, and + will be prosecuted to the maximum extent possible under law. + +******************************************************************************/ + +#include "channel.h" +#include "aacdecoder.h" +#include "block.h" +#include "aacdec_tns.h" +#include "FDK_bitstream.h" +#include "FDK_tools_rom.h" + +#include "conceal.h" + +#include "rvlc.h" + +#include "aacdec_hcr.h" + + +static +void MapMidSideMaskToPnsCorrelation (CAacDecoderChannelInfo *pAacDecoderChannelInfo[2]) +{ + int group; + + for (group = 0 ; group < pAacDecoderChannelInfo[L]->icsInfo.WindowGroups; group++) { + UCHAR groupMask = 1 << group; + + for (UCHAR band = 0 ; band < pAacDecoderChannelInfo[L]->icsInfo.MaxSfBands; band++) { + if (pAacDecoderChannelInfo[L]->pComData->jointStereoData.MsUsed[band] & groupMask) { /* channels are correlated */ + CPns_SetCorrelation(&pAacDecoderChannelInfo[L]->data.aac.PnsData, group, band, 0); + + if (CPns_IsPnsUsed(&pAacDecoderChannelInfo[L]->data.aac.PnsData, group, band) && + CPns_IsPnsUsed(&pAacDecoderChannelInfo[R]->data.aac.PnsData, group, band)) + pAacDecoderChannelInfo[L]->pComData->jointStereoData.MsUsed[band] ^= groupMask; /* clear the groupMask-bit */ + } + } + } +} + +/*! + \brief Decode channel pair element + + The function decodes a channel pair element. + + \return none +*/ +void CChannelElement_Decode( CAacDecoderChannelInfo *pAacDecoderChannelInfo[2], /*!< pointer to aac decoder channel info */ + CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[2], + SamplingRateInfo *pSamplingRateInfo, + UINT flags, + int el_channels) +{ + int ch, maybe_jstereo = 0; + + maybe_jstereo = (el_channels > 1); + + for (ch = 0; ch < el_channels; ch++) { + if ( pAacDecoderChannelInfo[ch]->renderMode == AACDEC_RENDER_IMDCT + || pAacDecoderChannelInfo[ch]->renderMode == AACDEC_RENDER_ELDFB ) + { + CBlock_InverseQuantizeSpectralData(pAacDecoderChannelInfo[ch], pSamplingRateInfo); + } + } + + + + if (maybe_jstereo) { + /* apply ms */ + if (pAacDecoderChannelInfo[L]->pDynData->RawDataInfo.CommonWindow) { + int maxSfBandsL = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo[L]->icsInfo); + int maxSfBandsR = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo[R]->icsInfo); + if (pAacDecoderChannelInfo[L]->data.aac.PnsData.PnsActive || pAacDecoderChannelInfo[R]->data.aac.PnsData.PnsActive) { + MapMidSideMaskToPnsCorrelation(pAacDecoderChannelInfo); + } + + CJointStereo_ApplyMS(pAacDecoderChannelInfo, + GetScaleFactorBandOffsets(&pAacDecoderChannelInfo[L]->icsInfo, pSamplingRateInfo), + GetWindowGroupLengthTable(&pAacDecoderChannelInfo[L]->icsInfo), + GetWindowGroups(&pAacDecoderChannelInfo[L]->icsInfo), + maxSfBandsL, + maxSfBandsR); + } + + /* apply intensity stereo */ /* modifies pAacDecoderChannelInfo[]->aSpecSfb */ + CJointStereo_ApplyIS(pAacDecoderChannelInfo, + GetScaleFactorBandOffsets(&pAacDecoderChannelInfo[L]->icsInfo, pSamplingRateInfo), + GetWindowGroupLengthTable(&pAacDecoderChannelInfo[L]->icsInfo), + GetWindowGroups(&pAacDecoderChannelInfo[L]->icsInfo), + GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo[L]->icsInfo), + pAacDecoderChannelInfo[L]->pDynData->RawDataInfo.CommonWindow ? 1 : 0); + + } + + for (ch = 0; ch < el_channels; ch++) + { + { + /* write pAacDecoderChannelInfo[ch]->specScale */ + CBlock_ScaleSpectralData(pAacDecoderChannelInfo[ch], pSamplingRateInfo); + + ApplyTools (pAacDecoderChannelInfo, pSamplingRateInfo, flags, ch); + } + + } + + CRvlc_ElementCheck( + pAacDecoderChannelInfo, + pAacDecoderStaticChannelInfo, + flags, + el_channels + ); +} + +void CChannel_CodebookTableInit(CAacDecoderChannelInfo *pAacDecoderChannelInfo) +{ + int b, w, maxBands, maxWindows; + int maxSfb = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo->icsInfo); + UCHAR *pCodeBook = pAacDecoderChannelInfo->pDynData->aCodeBook; + + if ( IsLongBlock(&pAacDecoderChannelInfo->icsInfo) ) { + maxBands = 64; + maxWindows = 1; + } else { + maxBands = 16; + maxWindows = 8; + } + + for (w = 0; w<maxWindows; w++) { + for (b = 0; b < maxSfb; b++) { + pCodeBook[b] = ESCBOOK; + } + for (; b<maxBands; b++) { + pCodeBook[b] = ZERO_HCB; + } + pCodeBook += maxBands; + } +} + + +/* + * Arbitrary order bitstream parser + */ + +AAC_DECODER_ERROR CChannelElement_Read(HANDLE_FDK_BITSTREAM hBs, + CAacDecoderChannelInfo *pAacDecoderChannelInfo[], + CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[], + const AUDIO_OBJECT_TYPE aot, + const SamplingRateInfo *pSamplingRateInfo, + const UINT flags, + const UINT frame_length, + const UCHAR numberOfChannels, + const SCHAR epConfig, + HANDLE_TRANSPORTDEC pTpDec + ) +{ + AAC_DECODER_ERROR error = AAC_DEC_OK; + const element_list_t *list; + int i, ch, decision_bit; + int crcReg1 = -1, crcReg2 = -1; + + FDK_ASSERT( (numberOfChannels == 1) || (numberOfChannels == 2) ); + + /* Get channel element sequence table */ + list = getBitstreamElementList(aot, epConfig, numberOfChannels, 0); + if (list == NULL) { + error = AAC_DEC_UNSUPPORTED_FORMAT; + goto bail; + } + + CTns_Reset(&pAacDecoderChannelInfo[0]->pDynData->TnsData); + if (numberOfChannels == 2) { + CTns_Reset(&pAacDecoderChannelInfo[1]->pDynData->TnsData); + } + + if (flags & (AC_ELD|AC_SCALABLE)) { + pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow = 1; + if (numberOfChannels == 2) { + pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow; + } + if (numberOfChannels == 2) { + pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow; + } + } + + /* Iterate through sequence table */ + i = 0; + ch = 0; + decision_bit = 0; + do { + switch (list->id[i]) { + case element_instance_tag: + pAacDecoderChannelInfo[0]->ElementInstanceTag = FDKreadBits(hBs, 4); + if (numberOfChannels == 2) { + pAacDecoderChannelInfo[1]->ElementInstanceTag = pAacDecoderChannelInfo[0]->ElementInstanceTag; + } + break; + case common_window: + decision_bit = pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.CommonWindow = FDKreadBits(hBs, 1); + if (numberOfChannels == 2) { + pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow; + } + break; + case ics_info: + /* Read individual channel info */ + error = IcsRead( hBs, + &pAacDecoderChannelInfo[ch]->icsInfo, + pSamplingRateInfo, + flags ); + + if (numberOfChannels == 2 && pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow) { + pAacDecoderChannelInfo[1]->icsInfo = pAacDecoderChannelInfo[0]->icsInfo; + } + break; + + + case ltp_data_present: + if (FDKreadBits(hBs, 1) != 0) { + error = AAC_DEC_UNSUPPORTED_PREDICTION; + } + break; + + case ms: + if ( CJointStereo_Read( + hBs, + &pAacDecoderChannelInfo[0]->pComData->jointStereoData, + GetWindowGroups(&pAacDecoderChannelInfo[0]->icsInfo), + GetScaleMaxFactorBandsTransmitted(&pAacDecoderChannelInfo[0]->icsInfo, + &pAacDecoderChannelInfo[1]->icsInfo), + flags) ) + { + error = AAC_DEC_PARSE_ERROR; + } + break; + + case global_gain: + pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.GlobalGain = (UCHAR) FDKreadBits(hBs,8); + break; + + case section_data: + error = CBlock_ReadSectionData( hBs, + pAacDecoderChannelInfo[ch], + pSamplingRateInfo, + flags ); + break; + + + case scale_factor_data: + if (flags & AC_ER_RVLC) { + /* read RVLC data from bitstream (error sens. cat. 1) */ + CRvlc_Read(pAacDecoderChannelInfo[ch], hBs); + } + else + { + error = CBlock_ReadScaleFactorData(pAacDecoderChannelInfo[ch], hBs, flags); + } + break; + + case pulse: + if ( CPulseData_Read( hBs, + &pAacDecoderChannelInfo[ch]->pDynData->specificTo.aac.PulseData, + pSamplingRateInfo->ScaleFactorBands_Long, /* pulse data is only allowed to be present in long blocks! */ + (void*)&pAacDecoderChannelInfo[ch]->icsInfo, + frame_length + ) != 0 ) + { + error = AAC_DEC_DECODE_FRAME_ERROR; + } + break; + case tns_data_present: + CTns_ReadDataPresentFlag(hBs, &pAacDecoderChannelInfo[ch]->pDynData->TnsData); + break; + case tns_data: + /* tns_data_present is checked inside CTns_Read(). */ + error = CTns_Read(hBs, &pAacDecoderChannelInfo[ch]->pDynData->TnsData, &pAacDecoderChannelInfo[ch]->icsInfo, flags); + break; + + case gain_control_data: + break; + + case gain_control_data_present: + if (FDKreadBits(hBs, 1)) { + error = AAC_DEC_UNSUPPORTED_GAIN_CONTROL_DATA; + } + break; + + case esc2_rvlc: + if (flags & AC_ER_RVLC) { + CRvlc_Decode( + pAacDecoderChannelInfo[ch], + pAacDecoderStaticChannelInfo[ch], + hBs + ); + } + break; + + case esc1_hcr: + if (flags & AC_ER_HCR) { + CHcr_Read(hBs, pAacDecoderChannelInfo[ch] ); + } + break; + + case spectral_data: + error = CBlock_ReadSpectralData( hBs, + pAacDecoderChannelInfo[ch], + pSamplingRateInfo, + flags ); + if (flags & AC_ELD) { + pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_ELDFB; + } else { + pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_IMDCT; + } + break; + + + /* CRC handling */ + case adtscrc_start_reg1: + if (pTpDec != NULL) { + crcReg1 = transportDec_CrcStartReg(pTpDec, 192); + } + break; + case adtscrc_start_reg2: + if (pTpDec != NULL) { + crcReg2 = transportDec_CrcStartReg(pTpDec, 128); + } + break; + case adtscrc_end_reg1: + case drmcrc_end_reg: + if (pTpDec != NULL) { + transportDec_CrcEndReg(pTpDec, crcReg1); + } + break; + case adtscrc_end_reg2: + if (pTpDec != NULL) { + transportDec_CrcEndReg(pTpDec, crcReg2); + } + break; + case drmcrc_start_reg: + if (pTpDec != NULL) { + crcReg1 = transportDec_CrcStartReg(pTpDec, 0); + } + break; + + /* Non data cases */ + case next_channel: + ch = (ch + 1) % numberOfChannels; + break; + case link_sequence: + list = list->next[decision_bit]; + i=-1; + break; + + default: + error = AAC_DEC_UNSUPPORTED_FORMAT; + break; + } + + if (error != AAC_DEC_OK) { + goto bail; + } + + i++; + + } while (list->id[i] != end_of_sequence); + +bail: + return error; +} |