/* ------------------------------------------------------------------ * 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_read_data.c ------------------------------------------------------------------------------ REVISION HISTORY Who: Date: MM/DD/YYYY Description: ------------------------------------------------------------------------------ INPUT AND OUTPUT DEFINITIONS INPUT SBRDECODER self, SBRBITSTREAM * stream, float *timeData, int numChannels OUTPUT errorCode, noError if successful ------------------------------------------------------------------------------ FUNCTION DESCRIPTION sbr decoder processing, set up SBR decoder phase 2 in case of different cotrol data ------------------------------------------------------------------------------ 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_read_data.h" #include "s_bit_buffer.h" #include "buf_getbits.h" #include "sbr_get_sce.h" #include "sbr_get_cpe.h" #include "sbr_reset_dec.h" #include "sbr_get_header_data.h" #include "sbr_crc_check.h" #include "aac_mem_funcs.h" #include "init_sbr_dec.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_read_data(SBRDECODER_DATA * self, SBR_DEC * sbrDec, SBRBITSTREAM *stream) { SBR_ERROR sbr_err = SBRDEC_OK; int32_t SbrFrameOK = 1; int32_t sbrCRCAlwaysOn = 0; UInt32 bs_header_flag = 0; SBR_HEADER_STATUS headerStatus = HEADER_OK; SBR_CHANNEL *SbrChannel = self->SbrChannel; int32_t zeropadding_bits; BIT_BUFFER bitBuf ; /* * evaluate Bitstream */ bitBuf.buffer_word = 0; bitBuf.buffered_bits = 0; bitBuf.nrBitsRead = 0; bitBuf.char_ptr = stream->sbrElement[0].Data; bitBuf.bufferLen = (stream->sbrElement[0].Payload) << 3; /* * we have to skip a nibble because the first element of Data only * contains a nibble of data ! */ buf_getbits(&bitBuf, LEN_NIBBLE); if ((stream->sbrElement[0].ExtensionType == SBR_EXTENSION_CRC) || sbrCRCAlwaysOn) { int32_t CRCLen = ((stream->sbrElement[0].Payload - 1) << 3) + 4 - SI_SBR_CRC_BITS; SbrFrameOK = sbr_crc_check(&bitBuf, CRCLen); } if (SbrFrameOK) { /* * The sbr data seems ok, if the header flag is set we read the header * and check if vital parameters have changed since the previous frame. * If the syncState equals UPSAMPLING, the SBR Tool has not been * initialised by SBR header data, and can only do upsampling */ bs_header_flag = buf_getbits(&bitBuf, 1); /* read Header flag */ if (bs_header_flag) { /* * If syncState == SBR_ACTIVE, it means that we've had a SBR header * before, and we will compare with the previous header to see if a * reset is required. If the syncState equals UPSAMPLING this means * that the SBR-Tool so far is only initialised to do upsampling * and hence we need to do a reset, and initialise the system * according to the present header. */ headerStatus = sbr_get_header_data(&(SbrChannel[0].frameData.sbr_header), &bitBuf, SbrChannel[0].syncState); } /* if (bs_header_flag) */ switch (stream->sbrElement[0].ElementID) { case SBR_ID_SCE : /* change of control data, reset decoder */ if (headerStatus == HEADER_RESET) { sbr_err = sbr_reset_dec(&(SbrChannel[0].frameData), sbrDec, self->SbrChannel[0].frameData.sbr_header.sampleRateMode); if (sbr_err != SBRDEC_OK) { break; } /* * At this point we have a header and the system has been reset, * hence syncState from now on will be SBR_ACTIVE. */ SbrChannel[0].syncState = SBR_ACTIVE; } if ((SbrChannel[0].syncState == SBR_ACTIVE)) { sbr_err = sbr_get_sce(&(SbrChannel[0].frameData), &bitBuf #ifdef PARAMETRICSTEREO , self->hParametricStereoDec #endif ); if (sbr_err != SBRDEC_OK) { break; } } break; case SBR_ID_CPE : if (bs_header_flag) { pv_memcpy(&(SbrChannel[1].frameData.sbr_header), &(SbrChannel[0].frameData.sbr_header), sizeof(SBR_HEADER_DATA)); } /* change of control data, reset decoder */ if (headerStatus == HEADER_RESET) { for (int32_t lr = 0 ; lr < 2 ; lr++) { sbr_err = sbr_reset_dec(&(SbrChannel[lr].frameData), sbrDec, self->SbrChannel[0].frameData.sbr_header.sampleRateMode); if (sbr_err != SBRDEC_OK) { break; } SbrChannel[lr].syncState = SBR_ACTIVE; } } if (SbrChannel[0].syncState == SBR_ACTIVE) { sbr_err = sbr_get_cpe(&(SbrChannel[0].frameData), &(SbrChannel[1].frameData), &bitBuf); if (sbr_err != SBRDEC_OK) { break; } } break; default: sbr_err = SBRDEC_ILLEGAL_PLUS_ELE_ID; break; } } /* if (SbrFrameOK) */ /* * Check that the bits read did not go beyond SBR frame boundaries */ zeropadding_bits = (8 - (bitBuf.nrBitsRead & 0x7)) & 0x7; if ((bitBuf.nrBitsRead + zeropadding_bits) > bitBuf.bufferLen) { sbr_err = SBRDEC_INVALID_BITSTREAM; } return sbr_err; } #endif