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Diffstat (limited to 'media/libstagefright/codecs/aacdec/sbr_get_envelope.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/sbr_get_envelope.cpp | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/sbr_get_envelope.cpp b/media/libstagefright/codecs/aacdec/sbr_get_envelope.cpp new file mode 100644 index 0000000..e92abb1 --- /dev/null +++ b/media/libstagefright/codecs/aacdec/sbr_get_envelope.cpp @@ -0,0 +1,265 @@ +/* ------------------------------------------------------------------ + * 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_envelope.c + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Who: Date: MM/DD/YYYY + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Arguments: h_frame_data - handle to struct SBR_FRAME_DATA + hBitBuf - handle to struct BIT_BUF + channel - channel number + + Return: void + + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Reads envelope 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_envelope.h" +#include "s_huffman.h" +#include "e_coupling_mode.h" +#include "sbr_code_book_envlevel.h" +#include "buf_getbits.h" +#include "sbr_decode_huff_cw.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 +----------------------------------------------------------------------------*/ + +void sbr_get_envelope(SBR_FRAME_DATA * h_frame_data, + BIT_BUFFER * hBitBuf) +{ + Int32 i; + Int32 j; + Int32 tmp; + Int32 no_band[MAX_ENVELOPES]; + Int32 delta = 0; + Int32 offset = 0; + Int32 ampRes; + Int32 envDataTableCompFactor; + Int32 start_bits; + Int32 start_bits_balance; + SbrHuffman hcb_t; + SbrHuffman hcb_f; + COUPLING_MODE coupling = h_frame_data->coupling; + + h_frame_data->nScaleFactors = 0; + + if ((h_frame_data->frameClass == FIXFIX) && + (h_frame_data->frameInfo[0] == 1)) + { + h_frame_data->ampRes = SBR_AMP_RES_1_5; + } + else + { + h_frame_data->ampRes = h_frame_data->sbr_header.ampResolution; + } + + ampRes = h_frame_data->ampRes; + + /* + * Set number of bits for first value depending on amplitude resolution + */ + if (ampRes == SBR_AMP_RES_3_0) + { + start_bits = SI_SBR_START_ENV_BITS_AMP_RES_3_0; + start_bits_balance = SI_SBR_START_ENV_BITS_BALANCE_AMP_RES_3_0; + } + else + { + start_bits = SI_SBR_START_ENV_BITS_AMP_RES_1_5; + start_bits_balance = SI_SBR_START_ENV_BITS_BALANCE_AMP_RES_1_5; + } + + /* + * Calculate number of values for each envelope and alltogether + */ + for (i = 0; i < h_frame_data->frameInfo[0]; i++) + { + no_band[i] = + h_frame_data->nSfb[h_frame_data->frameInfo[h_frame_data->frameInfo[0] + 2 + i]]; + h_frame_data->nScaleFactors += no_band[i]; + } + + + /* + * Select huffman codebook depending on coupling mode and amplitude resolution + */ + if (coupling == COUPLING_BAL) + { + envDataTableCompFactor = 1; + if (ampRes == SBR_AMP_RES_1_5) + { + hcb_t = bookSbrEnvBalance10T; + hcb_f = bookSbrEnvBalance10F; + } + else + { + hcb_t = bookSbrEnvBalance11T; + hcb_f = bookSbrEnvBalance11F; + } + } + else + { + envDataTableCompFactor = 0; + if (ampRes == SBR_AMP_RES_1_5) + { + hcb_t = bookSbrEnvLevel10T; + hcb_f = bookSbrEnvLevel10F; + } + else + { + hcb_t = bookSbrEnvLevel11T; + hcb_f = bookSbrEnvLevel11F; + } + } + + /* + * Now read raw envelope data + */ + for (j = 0; j < h_frame_data->frameInfo[0]; j++) + { + if (h_frame_data->domain_vec1[j] == FREQ) + { + if (coupling == COUPLING_BAL) + { + tmp = buf_getbits(hBitBuf, start_bits_balance); + h_frame_data->iEnvelope_man[offset] = tmp << envDataTableCompFactor; + } + else + { + tmp = buf_getbits(hBitBuf, start_bits); + h_frame_data->iEnvelope_man[offset] = tmp; + } + } + + for (i = (1 - h_frame_data->domain_vec1[j]); i < no_band[j]; i++) + { + + if (h_frame_data->domain_vec1[j] == FREQ) + { + delta = sbr_decode_huff_cw(hcb_f, hBitBuf); + } + else + { + delta = sbr_decode_huff_cw(hcb_t, hBitBuf); + } + + h_frame_data->iEnvelope_man[offset + i] = delta << envDataTableCompFactor; + } + offset += no_band[j]; + } + +} + +#endif + |