From dacaa73ae5010b66f4224d70a520945e5b653544 Mon Sep 17 00:00:00 2001 From: Andreas Huber Date: Mon, 7 Dec 2009 09:56:32 -0800 Subject: Initial check in of stagefright software AAC decoder based on PV source code. --- .../codecs/aacdec/sbr_extract_extended_data.cpp | 223 +++++++++++++++++++++ 1 file changed, 223 insertions(+) create mode 100644 media/libstagefright/codecs/aacdec/sbr_extract_extended_data.cpp (limited to 'media/libstagefright/codecs/aacdec/sbr_extract_extended_data.cpp') diff --git a/media/libstagefright/codecs/aacdec/sbr_extract_extended_data.cpp b/media/libstagefright/codecs/aacdec/sbr_extract_extended_data.cpp new file mode 100644 index 0000000..92b22f7 --- /dev/null +++ b/media/libstagefright/codecs/aacdec/sbr_extract_extended_data.cpp @@ -0,0 +1,223 @@ +/* ------------------------------------------------------------------ + * 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_extract_extended_data.c + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Who: Date: MM/DD/YYYY + 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 + + + -- cgit v1.1