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