| /* ------------------------------------------------------------------ |
| * 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_noise_floor_data.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 |
| |
| Return: void |
| |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| Reads noise-floor-level 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_noise_floor_data.h" |
| #include "e_coupling_mode.h" |
| #include "buf_getbits.h" |
| #include "sbr_code_book_envlevel.h" |
| #include "s_huffman.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_noise_floor_data(SBR_FRAME_DATA * h_frame_data, |
| BIT_BUFFER * hBitBuf) |
| { |
| Int32 i; |
| Int32 j; |
| Int32 k; |
| Int32 tmp; |
| Int32 delta; |
| Int32 noNoiseBands = h_frame_data->nNfb; |
| Int32 envDataTableCompFactor; |
| |
| COUPLING_MODE coupling = h_frame_data->coupling; |
| |
| SbrHuffman hcb_noiseF; |
| SbrHuffman hcb_noise; |
| |
| |
| if (coupling == COUPLING_BAL) |
| { |
| hcb_noise = bookSbrNoiseBalance11T; |
| hcb_noiseF = bookSbrEnvBalance11F; /* "bookSbrNoiseBalance11F" */ |
| envDataTableCompFactor = 1; |
| } |
| else |
| { |
| hcb_noise = bookSbrNoiseLevel11T; |
| hcb_noiseF = bookSbrEnvLevel11F; /* "bookSbrNoiseLevel11F" */ |
| envDataTableCompFactor = 0; |
| } |
| |
| /* |
| * Calculate number of values alltogether |
| */ |
| h_frame_data->nNoiseFactors = h_frame_data->frameInfo[((h_frame_data->frameInfo[0]) << 1) + 3] * noNoiseBands; |
| |
| |
| for (i = 0; i < h_frame_data->nNoiseFloorEnvelopes; i++) |
| { |
| k = i * noNoiseBands; |
| if (h_frame_data->domain_vec2[i] == FREQ) |
| { |
| if (coupling == COUPLING_BAL) |
| { |
| tmp = buf_getbits(hBitBuf, SI_SBR_START_NOISE_BITS_BALANCE_AMP_RES_3_0) << 1; /* max. 62 */ |
| h_frame_data->sbrNoiseFloorLevel_man[k] = tmp; |
| h_frame_data->sbrNoiseFloorLevel_exp[k] = 0; |
| } |
| else |
| { |
| tmp = buf_getbits(hBitBuf, SI_SBR_START_NOISE_BITS_AMP_RES_3_0); /* max. 31 */ |
| h_frame_data->sbrNoiseFloorLevel_man[k] = tmp; |
| h_frame_data->sbrNoiseFloorLevel_exp[k] = 0; |
| } |
| |
| for (j = 1; j < noNoiseBands; j++) |
| { |
| delta = sbr_decode_huff_cw(hcb_noiseF, hBitBuf); /* |
| * -31 < delta < 31 |
| * -24 < delta < 24 COUPLING_BAL (incl. <<1) |
| */ |
| h_frame_data->sbrNoiseFloorLevel_man[k+j] = delta << envDataTableCompFactor; |
| h_frame_data->sbrNoiseFloorLevel_exp[k+j] = 0; |
| } |
| } |
| else |
| { |
| for (j = 0; j < noNoiseBands; j++) |
| { |
| delta = sbr_decode_huff_cw(hcb_noise, hBitBuf); /* |
| * -31 < delta < 31 |
| * -24 < delta < 24 COUPLING_BAL (incl. <<1) |
| */ |
| h_frame_data->sbrNoiseFloorLevel_man[k+j] = delta << envDataTableCompFactor; |
| h_frame_data->sbrNoiseFloorLevel_exp[k+j] = 0; |
| } |
| } |
| } |
| } |
| |
| #endif |
| |
| |
