/* ------------------------------------------------------------------ * 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