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