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Diffstat (limited to 'media/libstagefright/codecs/aacdec/sbr_read_data.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/sbr_read_data.cpp | 324 |
1 files changed, 324 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/sbr_read_data.cpp b/media/libstagefright/codecs/aacdec/sbr_read_data.cpp new file mode 100644 index 0000000..2220fce --- /dev/null +++ b/media/libstagefright/codecs/aacdec/sbr_read_data.cpp @@ -0,0 +1,324 @@ +/* ------------------------------------------------------------------ + * 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 + |