| /************************* 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. |
| * * |
| ****************************************************************************/ |
| /* |
| * $Id: interface.h,v 1.6 2002/01/11 00:55:17 wmaycisco Exp $ |
| */ |
| |
| #ifndef _interface_h_ |
| #define _interface_h_ |
| |
| /* |
| * interface between the encoder and decoder |
| */ |
| |
| #define C_LN10 2.30258509299404568402 /* ln(10) */ |
| #define C_PI 3.14159265358979323846f /* pi */ |
| #define C_SQRT2 1.41421356237309504880 /* sqrt(2) */ |
| |
| #define MINTHR .5 |
| #define SF_C1 (13.33333/1.333333) |
| |
| /* prediction */ |
| #define PRED_ORDER 2 |
| #define PRED_ALPHA 0.90625f |
| #define PRED_A 0.953125f |
| #define PRED_B 0.953125f |
| |
| enum |
| { |
| /* |
| * block switching |
| */ |
| LN = 2048, |
| SN = 256, |
| LN2 = LN/2, |
| SN2 = SN/2, |
| LN4 = LN/4, |
| SN4 = SN/4, |
| NSHORT = LN/SN, |
| MAX_SBK = NSHORT, |
| |
| ONLY_LONG_WINDOW = 0, |
| LONG_START_WINDOW, |
| EIGHT_SHORT_WINDOW, |
| LONG_STOP_WINDOW, |
| NUM_WIN_SEQ, |
| |
| WLONG = ONLY_LONG_WINDOW, |
| WSTART, |
| WSHORT, |
| WSTOP, |
| |
| MAXBANDS = 16*NSHORT, /* max number of scale factor bands */ |
| MAXFAC = 121, /* maximum scale factor */ |
| MIDFAC = (MAXFAC-1)/2, |
| SF_OFFSET = 100, /* global gain must be positive */ |
| |
| /* |
| * specify huffman tables as signed (1) or unsigned (0) |
| */ |
| HUF1SGN = 1, |
| HUF2SGN = 1, |
| HUF3SGN = 0, |
| HUF4SGN = 0, |
| HUF5SGN = 1, |
| HUF6SGN = 1, |
| HUF7SGN = 0, |
| HUF8SGN = 0, |
| HUF9SGN = 0, |
| HUF10SGN = 0, |
| HUF11SGN = 0, |
| |
| ZERO_HCB = 0, |
| BY4BOOKS = 4, |
| ESCBOOK = 11, |
| NSPECBOOKS = ESCBOOK + 1, |
| BOOKSCL = NSPECBOOKS, |
| NBOOKS = NSPECBOOKS+1, |
| INTENSITY_HCB2 = 14, |
| INTENSITY_HCB = 15, |
| NOISE_HCB = 13, |
| |
| NOISE_PCM_BITS = 9, |
| NOISE_PCM_OFFSET = (1 << (NOISE_PCM_BITS-1)), |
| |
| NOISE_OFFSET = 90, |
| |
| LONG_SECT_BITS = 5, |
| SHORT_SECT_BITS = 3, |
| |
| /* |
| * Program Configuration |
| */ |
| AACMAIN = 0, |
| AACLC = 1, |
| AACSSR = 2, |
| AACLTP = 3, |
| |
| Fs_48 = 3, |
| Fs_44 = 4, |
| Fs_32 = 5, |
| |
| /* |
| * Misc constants |
| */ |
| CC_DOM = 0, /* before TNS */ |
| CC_IND = 1, |
| |
| /* |
| * Raw bitstream constants |
| */ |
| LEN_SE_ID = 3, |
| LEN_TAG = 4, |
| LEN_COM_WIN = 1, |
| LEN_ICS_RESERV = 1, |
| LEN_WIN_SEQ = 2, |
| LEN_WIN_SH = 1, |
| LEN_MAX_SFBL = 6, |
| LEN_MAX_SFBS = 4, |
| LEN_CB = 4, |
| LEN_SCL_PCM = 8, |
| LEN_PRED_PRES = 1, |
| LEN_PRED_RST = 1, |
| LEN_PRED_RSTGRP = 5, |
| LEN_PRED_ENAB = 1, |
| LEN_MASK_PRES = 2, |
| LEN_MASK = 1, |
| LEN_PULSE_PRES = 1, |
| LEN_TNS_PRES = 1, |
| LEN_GAIN_PRES = 1, |
| |
| LEN_NPULSE = 2, |
| LEN_PULSE_ST_SFB = 6, |
| LEN_POFF = 5, |
| LEN_PAMP = 4, |
| NUM_PULSE_LINES = 4, |
| PULSE_OFFSET_AMP = 4, |
| |
| LEN_IND_CCE_FLG = 1, |
| LEN_NCC = 3, |
| LEN_IS_CPE = 1, |
| LEN_CC_LR = 1, |
| LEN_CC_DOM = 1, |
| LEN_CC_SGN = 1, |
| LEN_CCH_GES = 2, |
| LEN_CCH_CGP = 1, |
| |
| LEN_D_ALIGN = 1, |
| LEN_D_CNT = 8, |
| LEN_D_ESC = 8, |
| LEN_F_CNT = 4, |
| LEN_F_ESC = 8, |
| LEN_NIBBLE = 4, |
| LEN_BYTE = 8, |
| LEN_PAD_DATA = 8, |
| MAX_DBYTES = ((1<<LEN_D_CNT) + (1<<LEN_D_ESC)), |
| |
| LEN_PC_COMM = 8, |
| |
| /* FILL */ |
| LEN_EX_TYPE = 4, /* don't use 0x0 or 0xA as extension type! */ |
| EX_FILL = 0, |
| EX_FILL_DATA = 1, |
| EX_DRC = 11, |
| |
| /* sfb 40, coef 672, pred bw of 15.75 kHz at 48 kHz |
| * this is also the highest number of bins used |
| * by predictor for any sampling rate |
| */ |
| MAX_PRED_SFB = 40, /* 48 kHz only, now obsolete */ |
| MAX_PRED_BINS = 672, |
| |
| ID_SCE = 0, |
| ID_CPE, |
| ID_CCE, |
| ID_LFE, |
| ID_DSE, |
| ID_PCE, |
| ID_FIL, |
| ID_END, |
| |
| /* PLL's don't like idle channels! */ |
| FILL_VALUE = 0x55, |
| |
| /* |
| * program configuration element |
| */ |
| LEN_OBJECTTYPE = 2, |
| LEN_SAMP_IDX = 4, |
| LEN_NUM_ELE = 4, |
| LEN_NUM_LFE = 2, |
| LEN_NUM_DAT = 3, |
| LEN_NUM_CCE = 4, |
| LEN_MIX_PRES = 1, |
| LEN_MMIX_IDX = 2, |
| LEN_PSUR_ENAB = 1, |
| LEN_ELE_IS_CPE = 1, |
| LEN_IND_SW_CCE = 1, |
| LEN_COMMENT_BYTES = 8, |
| |
| /* |
| * audio data interchange format header |
| */ |
| LEN_ADIF_ID = (32/8), |
| LEN_COPYRT_PRES = 1, |
| LEN_COPYRT_ID = (72/8), |
| LEN_ORIG = 1, |
| LEN_HOME = 1, |
| LEN_BS_TYPE = 1, |
| LEN_BIT_RATE = 23, |
| LEN_NUM_PCE = 4, |
| LEN_ADIF_BF = 20, |
| XXX |
| }; |
| |
| #endif /* #ifndef _interface_h_ */ |
