l3.h
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #ifndef _L3_H_
- #define _L3_H_
- /**** L3.h ***************************************************
- Layer III structures
- *** Layer III is 32 bit only ***
- *** Layer III code assumes 32 bit int ***
- Copyright 1996-97 Xing Technology Corp.
- ******************************************************************/
- #define GLOBAL_GAIN_SCALE (4*15)
- /* #define GLOBAL_GAIN_SCALE 0 */
- #if defined _M_IX86 || defined __alpha__ || defined __i386__ || defined __i386 || defined i386 || defined _LITTLE_ENDIAN
- #define LITTLE_ENDIAN 1
- #else
- #define LITTLE_ENDIAN 0
- #endif
- #ifndef LITTLE_ENDIAN
- #error Layer III LITTLE_ENDIAN must be defined 0 or 1
- #endif
- /*-----------------------------------------------------------*/
- /*---- huffman lookup tables ---*/
- /* endian dependent !!! */
- #if LITTLE_ENDIAN
- typedef union {
- int ptr;
- struct {
- unsigned char signbits;
- unsigned char x;
- unsigned char y;
- unsigned char purgebits; // 0 = esc
- } b;
- } HUFF_ELEMENT;
- #else /* big endian machines */
- typedef union {
- int ptr; /* int must be 32 bits or more */
- struct {
- unsigned char purgebits; // 0 = esc
- unsigned char y;
- unsigned char x;
- unsigned char signbits;
- } b;
- } HUFF_ELEMENT;
- #endif
- /*--------------------------------------------------------------*/
- typedef struct {
- unsigned int bitbuf;
- int bits;
- unsigned char *bs_ptr;
- unsigned char *bs_ptr0;
- unsigned char *bs_ptr_end; // optional for overrun test
- } BITDAT;
- /*-- side info ---*/
- typedef struct {
- int part2_3_length;
- int big_values;
- int global_gain;
- int scalefac_compress;
- int window_switching_flag;
- int block_type;
- int mixed_block_flag;
- int table_select[3];
- int subblock_gain[3];
- int region0_count;
- int region1_count;
- int preflag;
- int scalefac_scale;
- int count1table_select;
- } GR;
- typedef struct {
- int mode;
- int mode_ext;
- /*---------------*/
- int main_data_begin; /* beginning, not end, my spec wrong */
- int private_bits;
- /*---------------*/
- int scfsi[2]; /* 4 bit flags [ch] */
- GR gr[2][2]; /* [gran][ch] */
- } SIDE_INFO;
- /*-----------------------------------------------------------*/
- /*-- scale factors ---*/
- // check dimensions - need 21 long, 3*12 short
- // plus extra for implicit sf=0 above highest cb
- typedef struct {
- int l[23]; /* [cb] */
- int s[3][13]; /* [window][cb] */
- } SCALEFACT;
- /*-----------------------------------------------------------*/
- typedef struct {
- int cbtype; /* long=0 short=1 */
- int cbmax; /* max crit band */
- int lb_type; /* long block type 0 1 3 */
- int cbs0; /* short band start index 0 3 12 (12=no shorts */
- int ncbl; /* number long cb's 0 8 21 */
- int cbmax_s[3]; /* cbmax by individual short blocks */
- } CB_INFO;
- /*-----------------------------------------------------------*/
- /* scale factor infor for MPEG2 intensity stereo */
- typedef struct {
- int nr[3];
- int slen[3];
- int intensity_scale;
- } IS_SF_INFO;
- /*-----------------------------------------------------------*/
- typedef union {
- int s;
- float x;
- } SAMPLE;
- /*-----------------------------------------------------------*/
- #endif //_L3_H_