nec_abs_const.h
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上传日期:2007-02-02
资源大小:6116k
文件大小:5k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- This software module was originally developed by
- Toshiyuki Nomura (NEC Corporation)
- and edited by
- Naoya Tanaka (Matsushita Communication Ind. Co., Ltd.)
- 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.
- */
- /*
- * MPEG-4 Audio Verification Model (LPC-ABS Core)
- *
- * Constants used in the NEC Modules
- *
- * Ver1.0 96.12.16 T.Nomura(NEC)
- * Ver2.0 97.03.17 T.Nomura(NEC)
- */
- /*------ Bit rate range --------*/
- #define NEC_PAN_BITRATE1 3850
- #define NEC_PAN_BITRATE2 4900
- #define NEC_PAN_BITRATE3 5700
- #define NEC_PAN_BITRATE4 7700
- #define NEC_PAN_BITRATE5 11000
- #define NEC_PAN_BITRATE6 12200
- #define NEC_ENH_BITRATE 2000
- /*------ Bitstream syntax --------*/
- #define NEC_BIT_MODE 2
- #define NEC_BIT_RMS 6
- #define NEC_BIT_ACB 8
- #define NEC_BIT_GAIN 6
- #define NEC_NUM_SHAPE_CBKS 3
- #define NEC_NUM_GAIN_CBKS 1
- #define NEC_NUM_OTHER_INDICES 2
- #define NEC_NUM_LPC_INDICES_FRQ16 6
- #define NEC_BIT_ENH_POS40_2 4
- #define NEC_BIT_ENH_SGN40_2 2
- #define NEC_BIT_ENH_POS80_4 12
- #define NEC_BIT_ENH_SGN80_4 4
- #define NEC_BIT_ENH_GAIN 4
- #define NEC_BIT_ACB_FRQ16 3
- #define NEC_BIT_GAIN_FRQ16 11
- #define NEC_BIT_LSP1620 32
- #define NEC_BIT_LSP1620_0 4
- #define NEC_BIT_LSP1620_1 7
- #define NEC_BIT_LSP1620_2 4
- #define NEC_BIT_LSP1620_3 6
- #define NEC_BIT_LSP1620_4 7
- #define NEC_BIT_LSP1620_5 4
- /*------ Frame --------*/
- #define NEC_FRAME40MS 320
- #define NEC_FRAME30MS 240
- #define NEC_FRAME20MS 160
- #define NEC_FRAME10MS 80
- #define NEC_NSF2 2
- #define NEC_NSF3 3
- #define NEC_NSF4 4
- /*------ LPC Analysis ------*/
- #define NEC_LEN_LPC_ANALYSIS 80 /* LPC analysis interval */
- #define NEC_PAN_NLA 40 /* look ahead for LPC analysis */
- #define NEC_PAN_NLB 80 /* look back for LPC analysis */
- #define NEC_FRQ16_NLA 80 /* look ahead for LPC analysis */
- #define NEC_FRQ16_NLB 160 /* look back for LPC analysis */
- #define NEC_LPC_ORDER 10 /* LPC analysis order */
- #define NEC_LPC_ORDER_FRQ16 20 /* LPC analysis order */
- #define NEC_LPC_ORDER_MAXIMUM 20 /* LPC analysis order */
- /*------ Pitch Analysis ------*/
- #define NEC_PITCH_MIN 17 /* minimum pitch period */
- #define NEC_PITCH_MIN_FRQ16 20
- #define NEC_PITCH_MAX 144 /* maximum pitch period */
- #define NEC_PITCH_MAX_FRQ16 295
- #define NEC_PITCH_MAX_MAXIMUM 295
- #define NEC_PITCH_LIMIT_FRQ16 778
- #define NEC_PITCH_RSLTN 6 /* pitch analysis resolution */
- #define NEC_PITCH_IFTAP 5 /* interpolation tap length */
- #define NEC_PITCH_IFTAP16 10 /* interpolation tap length */
- #define NEC_PI 3.141592654
- #define NEC_ACB_BIT 8
- #define NEC_ACB_BIT_FRQ16 3
- /*------ RMS ------*/
- #define NEC_RMS_MAX_V 15864.0
- #define NEC_RMS_MAX_U 7932.0
- #define NEC_MU_LAW_V 512.0
- #define NEC_MU_LAW_U 1024.0
- /*------ Others ------*/
- #define NEC_MAX_NSF 10 /* maximum number of subframes */
- #define NEC_PAI 3.141592
- #define NEC_LPF_DELAY 80
- #define NEC_GAMMA_BE 0.9951
- #define NEC_GAM_AR 0.60 /* perceptual weighting factor */
- #define NEC_GAM_MA 0.94 /* perceptual weighting factor */
- /* LPC analysis using asynmmtric windows */
- #define NEC_ASW_LEN1 120
- #define NEC_ASW_LEN2 80
- #define NEC_ASW_LEN1_FRQ16 200
- #define NEC_ASW_LEN2_FRQ16 120
- /* for WB MPE mode */
- #define NEC_FRAME20MS_FRQ16 320
- #define NEC_FRAME10MS_FRQ16 160
- #define NEC_SBFRM_SIZE40 40
- #define NEC_SBFRM_SIZE80 80
- #define NEC_NSF8 8
- #define NEC_ENH_BITRATE_FRQ16 4000
- #define NEC_ACB_BIT_WB 9
- #define NEC_BIT_GAIN_WB 7
- #define NormalDelayMode 0
- #define LowDelayMode 1