| /* ------------------------------------------------------------------ |
| * Copyright (C) 2008 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_extract_extended_data.c |
| |
| Date: 07/17/2003 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| SBR_FRAME_DATA *hFrameData, Destination for extracted data of left channel |
| SBR_FRAME_DATA *hFrameDataRight Destination for extracted data of right channel |
| BIT_BUFFER hBitBuf pointer to bit buffer |
| |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| Reads extension data from the bitstream |
| |
| The bitstream format allows up to 4 kinds of extended data element. |
| Extended data may contain several elements, each identified by a 2-bit-ID. |
| |
| ------------------------------------------------------------------------------ |
| 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_extract_extended_data.h" |
| #include "buf_getbits.h" |
| |
| #ifdef PARAMETRICSTEREO |
| #include "ps_read_data.h" |
| #endif |
| |
| /*---------------------------------------------------------------------------- |
| ; 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 |
| ----------------------------------------------------------------------------*/ |
| |
| void sbr_extract_extended_data(BIT_BUFFER * hBitBuf |
| #ifdef PARAMETRICSTEREO /* Parametric Stereo Decoder */ |
| , HANDLE_PS_DEC hParametricStereoDec |
| #endif |
| ) |
| { |
| Int32 extended_data; |
| Int32 i; |
| Int32 nBitsLeft; |
| Int32 extension_id; |
| |
| extended_data = buf_get_1bit(hBitBuf); /* SI_SBR_EXTENDED_DATA_BITS */ |
| |
| if (extended_data) |
| { |
| Int32 cnt; |
| |
| cnt = buf_getbits(hBitBuf, SI_SBR_EXTENSION_SIZE_BITS); |
| if (cnt == (1 << SI_SBR_EXTENSION_SIZE_BITS) - 1) |
| { |
| cnt += buf_getbits(hBitBuf, SI_SBR_EXTENSION_ESC_COUNT_BITS); |
| } |
| |
| nBitsLeft = (cnt << 3); |
| while (nBitsLeft > 7) |
| { |
| extension_id = buf_getbits(hBitBuf, SI_SBR_EXTENSION_ID_BITS); |
| nBitsLeft -= SI_SBR_EXTENSION_ID_BITS; |
| |
| switch (extension_id) |
| { |
| #ifdef HQ_SBR |
| #ifdef PARAMETRICSTEREO |
| |
| /* |
| * Parametric Coding supports the Transient, Sinusoidal, Noise, and |
| * Parametric Stereo tools (MPEG4). |
| * 3GPP use aac+ hq along with ps for enhanced aac+ |
| * The PS tool uses complex-value QMF data, therefore can not be used |
| * with low power version of aac+ |
| */ |
| case EXTENSION_ID_PS_CODING: |
| |
| if (hParametricStereoDec != NULL) |
| { |
| if (!hParametricStereoDec->psDetected) |
| { |
| /* parametric stereo detected */ |
| hParametricStereoDec->psDetected = 1; |
| } |
| |
| nBitsLeft -= ps_read_data(hParametricStereoDec, |
| hBitBuf, |
| nBitsLeft); |
| |
| } |
| |
| break; |
| #endif |
| #endif |
| case 0: |
| |
| default: |
| /* An unknown extension id causes the remaining extension data |
| * to be skipped |
| */ |
| cnt = nBitsLeft >> 3; /* number of remaining bytes */ |
| |
| for (i = 0; i < cnt; i++) |
| { |
| buf_getbits(hBitBuf, 8); |
| } |
| |
| nBitsLeft -= (cnt << 3); |
| } |
| } |
| /* read fill bits for byte alignment */ |
| buf_getbits(hBitBuf, nBitsLeft); |
| } |
| } |
| |
| |
| #endif |
| |
| |
| |
