| /* ------------------------------------------------------------------ |
| * 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. |
| * ------------------------------------------------------------------- |
| */ |
| /* |
| |
| Pathname: infoinit.c |
| |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Modified from original shareware code |
| |
| Description: Modified to pass variables by reference to eliminate use |
| of global variables. |
| |
| Description: Pass eight_short_info and the array 'sfbwidth128'. |
| Change function arguments' names for clarity |
| |
| Description: move sfb definitions to "sfb.h", and "sfb.c", eliminated |
| the function "huffbookinit.c" |
| |
| Description: Remove initialization of the never used array, |
| pFrameInfo->group_offs |
| |
| Description: |
| (1) Changed "stdinc.h" to <stdlib.h> - this avoids linking in the math |
| library and stdio.h. (All for just defining the NULL pointer macro) |
| |
| (2) Updated copyright header. |
| |
| Description: Updated the SW template to include the full pathname to the |
| source file and a slightly modified copyright header. |
| |
| Description: Addresses of constant vectors are now found by means of a |
| switch statement, this solve linking problem when using the |
| /ropi option (Read-only position independent) for some |
| compilers |
| |
| Who: Date: |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| pSi = pointer to sampling rate info |
| ppWin_seq_info = pointer array to window sequence Info struct |
| pSfbwidth128 = pointer to sfb bandwidth array of short window |
| |
| Local Stores/Buffers/Pointers Needed: |
| |
| Global Stores/Buffers/Pointers Needed: |
| |
| Outputs: |
| |
| Pointers and Buffers Modified: |
| |
| ppWin_seq_info[ONLY_LONG_WINDOW]{all structure members} = setup values |
| ppWin_seq_info[EIGHT_SHORT_WINDOW]{all structure members} = setup values |
| |
| Local Stores Modified: |
| |
| Global Stores Modified: |
| |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| This function sets the values of 'Info' structure for blocks containing long |
| and short window sequences, the following structures are being set: |
| |
| win_seq_info[ONLY_LONG_WINDOW], win_seq_info[EIGHT_SHORT_WINDOW], |
| only_long_info and eight_short_info |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| (1) MPEG-2 NBC Audio Decoder |
| "This software module was originally developed by AT&T, Dolby |
| Laboratories, Fraunhofer Gesellschaft IIS in the course of development |
| of the MPEG-2 NBC/MPEG-4 Audio standard ISO/IEC 13818-7, 14496-1,2 and |
| 3. This software module is an implementation of a part of one or more |
| MPEG-2 NBC/MPEG-4 Audio tools as specified by the MPEG-2 NBC/MPEG-4 |
| Audio standard. ISO/IEC gives users of the MPEG-2 NBC/MPEG-4 Audio |
| standards free license to this software module or modifications thereof |
| for use in hardware or software products claiming conformance to the |
| MPEG-2 NBC/MPEG-4 Audio standards. Those intending to use this software |
| module in hardware or software products are advised that this use may |
| infringe existing patents. The original developer of this software |
| module and his/her company, the subsequent editors and their companies, |
| and ISO/IEC have no liability for use of this software module or |
| modifications thereof in an implementation. Copyright is not released |
| for non MPEG-2 NBC/MPEG-4 Audio conforming products.The original |
| developer retains full right to use the code for his/her own purpose, |
| assign or donate the code to a third party and to inhibit third party |
| from using the code for non MPEG-2 NBC/MPEG-4 Audio conforming products. |
| This copyright notice must be included in all copies or derivative |
| works." |
| Copyright(c)1996. |
| |
| (2) ISO/IEC 14496-3: 1999(E) |
| Subpart 4 p66 (sfb tables) |
| p111 (4.6.10) |
| p200 (Annex 4.B.5) |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| pFrameInfo = pointer to only_long_info; |
| win_seq_info[ONLY_LONG_WINDOW] = pFrameInfo; |
| pFrameInfo{all structure members} = setup values; |
| |
| |
| pFrameInfo = pointer to eight_short_info; |
| win_seq_info[EIGHT_SHORT_WINDOW] = pFrameInfo; |
| pFrameInfo{all structure.members} = setup values; |
| |
| |
| FOR (window_seq = 0; window_seq < NUM_WIN_SEQ; win_seq++) |
| |
| win_seq_info[window_seq].members = setup values; |
| |
| ENDFOR |
| |
| ------------------------------------------------------------------------------ |
| RESOURCES USED |
| When the code is written for a specific target processor the |
| the resources used should be documented below. |
| |
| STACK USAGE: |
| |
| DATA MEMORY USED: x words |
| |
| PROGRAM MEMORY USED: x words |
| |
| CLOCK CYCLES: |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "pv_audio_type_defs.h" |
| #include "s_sr_info.h" |
| #include "s_frameinfo.h" |
| #include "e_blockswitching.h" |
| #include "e_huffmanconst.h" |
| #include "sfb.h" |
| #include "huffman.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 |
| ----------------------------------------------------------------------------*/ |
| |
| Int infoinit( |
| const Int samp_rate_idx, |
| FrameInfo **ppWin_seq_info, |
| Int *pSfbwidth128) |
| |
| { |
| /*---------------------------------------------------------------------------- |
| ; Define all local variables |
| ----------------------------------------------------------------------------*/ |
| |
| Int i; |
| Int sfb_idx, sfb_sbk; |
| Int bins_sbk; |
| Int win_seq; |
| Int start_idx, end_idx; |
| Int nsfb_short; |
| Int16 *sfbands; |
| FrameInfo *pFrameInfo; |
| |
| const SR_Info *pSi = &(samp_rate_info[samp_rate_idx]); |
| |
| const Int16 * pt_SFbands1024 = NULL; |
| const Int16 * pt_SFbands128 = NULL; |
| |
| /*---------------------------------------------------------------------------- |
| ; Function body here |
| ----------------------------------------------------------------------------*/ |
| |
| switch (pSi->samp_rate) |
| { |
| case 96000: |
| case 88200: |
| pt_SFbands1024 = sfb_96_1024; |
| pt_SFbands128 = sfb_64_128; /* equal to table sfb_96_128, (eliminated) */ |
| break; |
| case 64000: |
| pt_SFbands1024 = sfb_64_1024; |
| pt_SFbands128 = sfb_64_128; |
| break; |
| case 48000: |
| case 44100: |
| pt_SFbands1024 = sfb_48_1024; |
| pt_SFbands128 = sfb_48_128; |
| break; |
| case 32000: |
| pt_SFbands1024 = sfb_32_1024; |
| pt_SFbands128 = sfb_48_128; |
| break; |
| case 24000: |
| case 22050: |
| pt_SFbands1024 = sfb_24_1024; |
| pt_SFbands128 = sfb_24_128; |
| break; |
| case 16000: |
| case 12000: |
| case 11025: |
| pt_SFbands1024 = sfb_16_1024; |
| pt_SFbands128 = sfb_16_128; |
| break; |
| case 8000: |
| pt_SFbands1024 = sfb_8_1024; |
| pt_SFbands128 = sfb_8_128; |
| break; |
| default: |
| // sampling rate not supported |
| return -1; |
| } |
| |
| /* long block info */ |
| |
| pFrameInfo = ppWin_seq_info[ONLY_LONG_WINDOW]; |
| pFrameInfo->islong = 1; |
| pFrameInfo->num_win = 1; |
| pFrameInfo->coef_per_frame = LN2; /* = 1024 */ |
| |
| pFrameInfo->sfb_per_win[0] = pSi->nsfb1024; |
| pFrameInfo->sectbits[0] = LONG_SECT_BITS; |
| pFrameInfo->win_sfb_top[0] = (Int16 *)pt_SFbands1024; |
| |
| pFrameInfo->sfb_width_128 = NULL; /* no short block sfb */ |
| pFrameInfo->num_groups = 1; /* long block, one group */ |
| pFrameInfo->group_len[0] = 1; /* only one window */ |
| |
| /* short block info */ |
| pFrameInfo = ppWin_seq_info[EIGHT_SHORT_WINDOW]; |
| pFrameInfo->islong = 0; |
| pFrameInfo->num_win = NSHORT; |
| pFrameInfo->coef_per_frame = LN2; |
| |
| for (i = 0; i < pFrameInfo->num_win; i++) |
| { |
| pFrameInfo->sfb_per_win[i] = pSi->nsfb128; |
| pFrameInfo->sectbits[i] = SHORT_SECT_BITS; |
| pFrameInfo->win_sfb_top[i] = (Int16 *)pt_SFbands128; |
| } |
| |
| /* construct sfb width table */ |
| pFrameInfo->sfb_width_128 = pSfbwidth128; |
| for (i = 0, start_idx = 0, nsfb_short = pSi->nsfb128; i < nsfb_short; i++) |
| { |
| end_idx = pt_SFbands128[i]; |
| pSfbwidth128[i] = end_idx - start_idx; |
| start_idx = end_idx; |
| } |
| |
| |
| /* common to long and short */ |
| for (win_seq = 0; win_seq < NUM_WIN_SEQ; win_seq++) |
| { |
| |
| if (ppWin_seq_info[win_seq] != NULL) |
| { |
| pFrameInfo = ppWin_seq_info[win_seq]; |
| pFrameInfo->sfb_per_frame = 0; |
| sfb_sbk = 0; |
| bins_sbk = 0; |
| |
| for (i = 0; i < pFrameInfo->num_win; i++) |
| { |
| |
| /* compute coef_per_win */ |
| pFrameInfo->coef_per_win[i] = |
| pFrameInfo->coef_per_frame / pFrameInfo->num_win; |
| |
| /* compute sfb_per_frame */ |
| pFrameInfo->sfb_per_frame += pFrameInfo->sfb_per_win[i]; |
| |
| /* construct default (non-interleaved) bk_sfb_top[] */ |
| sfbands = pFrameInfo->win_sfb_top[i]; |
| for (sfb_idx = 0; sfb_idx < pFrameInfo->sfb_per_win[i]; |
| sfb_idx++) |
| { |
| pFrameInfo->frame_sfb_top[sfb_idx+sfb_sbk] = |
| sfbands[sfb_idx] + bins_sbk; |
| } |
| |
| bins_sbk += pFrameInfo->coef_per_win[i]; |
| sfb_sbk += pFrameInfo->sfb_per_win[i]; |
| } /* for i = sbk ends */ |
| } |
| |
| } /* for win_seq ends */ |
| |
| return SUCCESS; |
| |
| } /* infoinit */ |
