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author | Andreas Huber <andih@google.com> | 2009-12-07 09:56:32 -0800 |
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committer | Andreas Huber <andih@google.com> | 2009-12-07 11:02:28 -0800 |
commit | f44de515d3b6098a0b585865c1a0c7b20d3075a6 (patch) | |
tree | 028b1d81643bbb332464b42b50a0f79ba5359142 /media/libstagefright/codecs/aacdec/sbr_get_header_data.cpp | |
parent | bf697e37550d9e8376089b0b5e498613bede798c (diff) | |
download | frameworks_av-f44de515d3b6098a0b585865c1a0c7b20d3075a6.zip frameworks_av-f44de515d3b6098a0b585865c1a0c7b20d3075a6.tar.gz frameworks_av-f44de515d3b6098a0b585865c1a0c7b20d3075a6.tar.bz2 |
Initial check in of stagefright software AAC decoder based on PV source code.
Diffstat (limited to 'media/libstagefright/codecs/aacdec/sbr_get_header_data.cpp')
-rw-r--r-- | media/libstagefright/codecs/aacdec/sbr_get_header_data.cpp | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/sbr_get_header_data.cpp b/media/libstagefright/codecs/aacdec/sbr_get_header_data.cpp new file mode 100644 index 0000000..42789ae --- /dev/null +++ b/media/libstagefright/codecs/aacdec/sbr_get_header_data.cpp @@ -0,0 +1,221 @@ +/* ------------------------------------------------------------------ + * 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_get_header_data.c + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Who: Date: MM/DD/YYYY + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Arguments: h_sbr_header - handle to struct SBR_HEADER_DATA + hBitBuf - handle to struct BIT_BUFFER + id_sbr - SBR_ELEMENT_ID + + Return: error status - 0 if ok + + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Reads header data from bitstream + +------------------------------------------------------------------------------ + 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_get_header_data.h" +#include "sbr_constants.h" +#include "buf_getbits.h" +#include "aac_mem_funcs.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_HEADER_STATUS sbr_get_header_data(SBR_HEADER_DATA * h_sbr_header, + BIT_BUFFER * hBitBuf, + SBR_SYNC_STATE syncState) +{ + SBR_HEADER_DATA lastHeader; + Int32 headerExtra1, headerExtra2; + + + /* Copy header to temporary header */ + if (syncState == SBR_ACTIVE) + { + pv_memcpy(&lastHeader, h_sbr_header, sizeof(SBR_HEADER_DATA)); + } + else + { + pv_memset((void *)&lastHeader, 0, sizeof(SBR_HEADER_DATA)); + } + + + /* Read new header from bitstream */ + h_sbr_header->ampResolution = buf_getbits(hBitBuf, SI_SBR_AMP_RES_BITS); + h_sbr_header->startFreq = buf_getbits(hBitBuf, SI_SBR_START_FREQ_BITS); + h_sbr_header->stopFreq = buf_getbits(hBitBuf, SI_SBR_STOP_FREQ_BITS); + h_sbr_header->xover_band = buf_getbits(hBitBuf, SI_SBR_XOVER_BAND_BITS); + + buf_getbits(hBitBuf, SI_SBR_RESERVED_BITS_HDR); + + headerExtra1 = buf_getbits(hBitBuf, SI_SBR_HEADER_EXTRA_1_BITS); + headerExtra2 = buf_getbits(hBitBuf, SI_SBR_HEADER_EXTRA_2_BITS); + + /* handle extra header information */ + if (headerExtra1) + { + h_sbr_header->freqScale = buf_getbits(hBitBuf, SI_SBR_FREQ_SCALE_BITS); + h_sbr_header->alterScale = buf_getbits(hBitBuf, SI_SBR_ALTER_SCALE_BITS); + h_sbr_header->noise_bands = buf_getbits(hBitBuf, SI_SBR_NOISE_BANDS_BITS); + } + else + { /* Set default values.*/ + h_sbr_header->freqScale = SBR_FREQ_SCALE_DEFAULT; + h_sbr_header->alterScale = SBR_ALTER_SCALE_DEFAULT; + h_sbr_header->noise_bands = SBR_NOISE_BANDS_DEFAULT; + } + + + if (headerExtra2) + { + h_sbr_header->limiterBands = buf_getbits(hBitBuf, SI_SBR_LIMITER_BANDS_BITS); + h_sbr_header->limiterGains = buf_getbits(hBitBuf, SI_SBR_LIMITER_GAINS_BITS); + h_sbr_header->interpolFreq = buf_getbits(hBitBuf, SI_SBR_INTERPOL_FREQ_BITS); + h_sbr_header->smoothingLength = buf_getbits(hBitBuf, SI_SBR_SMOOTHING_LENGTH_BITS); + } + else + { /* Set default values.*/ + h_sbr_header->limiterBands = SBR_LIMITER_BANDS_DEFAULT; + h_sbr_header->limiterGains = SBR_LIMITER_GAINS_DEFAULT; + h_sbr_header->interpolFreq = SBR_INTERPOL_FREQ_DEFAULT; + h_sbr_header->smoothingLength = SBR_SMOOTHING_LENGTH_DEFAULT; + } + + if (syncState == SBR_ACTIVE) + { + h_sbr_header->status = HEADER_OK; + + /* look for new settings */ + if (lastHeader.startFreq != h_sbr_header->startFreq || + lastHeader.stopFreq != h_sbr_header->stopFreq || + lastHeader.xover_band != h_sbr_header->xover_band || + lastHeader.freqScale != h_sbr_header->freqScale || + lastHeader.alterScale != h_sbr_header->alterScale || + lastHeader.noise_bands != h_sbr_header->noise_bands) + { + h_sbr_header->status = HEADER_RESET; + } + } + else + { + h_sbr_header->status = HEADER_RESET; + } + + return h_sbr_header->status; +} + +#endif + + + |