dec_blk.c
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上传日期:2007-06-06
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文件大小:5k
- /* ***** 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 ***** */
- #include "hxtypes.h"
- #include "machine.h"
- #ifdef FOR_MAC
- #include <stdlib.h> // For exit function
- #endif
- #include "dllindex.h"
- #include "h261defs.h"
- #include "vldstate.h"
- #include "h261func.h"
- #include "hvscodes.h"
- #include "dec_blk.h"
- #ifndef UNREFERENCED_PARAMETER
- #define UNREFERENCED_PARAMETER(x) (x) = (x)
- #endif
- extern S16 Recon [QUANT_MAX - QUANT_MIN + 1] [N_SYM_INDICES];
- //#define BS_ERR_EXIT(a) a // Terminate on bitstream error (i.e., illegal
- // bitstream syntax) to simplify debugging
- #define BS_ERR_EXIT(a) // Handle bitstream errors without terminating
- // (to cope with a real channel)
- //#define CHECKSYM_ON // To avoid unreferenced params
- #ifdef CHECKSYM_ON
- #include <stdio.h>
- #define CHECKSYM(a) a // Check symbol types to verify decoder state tables
- #else
- #define CHECKSYM(a) // Don't check symbol types
- #endif
- #ifdef CHECKSYM_ON
- static int checksym1( SYMBOL sym, int type, char routine[] )
- {
- char msg[120], csym[80], ctype[80];
-
- UNREFERENCED_PARAMETER( routine );
- if (sym.type == type) {
- return (OK);
- } else { // Not expected type
- sprintsym( sym , csym, 80);
- sprinttype( type, ctype, 80);
- SafeSprintf(msg, 120, "%s: Encountered %s Expected %s", routine, csym, ctype);
- H261ErrMsg( msg );
- return (H261_ERROR);
- }
- }
- #endif
- extern int decode_block( SYMBOL insym[], int * nextsym,
- BLOCK_DESCR * block, SYMBOL outsym[])
- {
- int isym, zzpos, run;
- CHECKSYM(char msg[120]); /* Flawfinder: ignore */
- isym = 0;
- zzpos = 0;
- //printf("decode_block first: "); printsym( insym[*nextsym] ); printf("n");
- while (insym[*nextsym].type != SYM_EOB) {
- if (insym[*nextsym].type == SYM_ESC_RUN) {
- run = insym[(*nextsym)++].value;
- outsym[isym].type = run;
- CHECKSYM( if (checksym1( insym[*nextsym], SYM_ESC_LEVEL, "decode_block") != OK) exit(0); )
- outsym[isym++].value = insym[(*nextsym)++].value;
- } else {
- run = insym[*nextsym].type;
- CHECKSYM( if (run < 0) {
- sprintf( msg, "PROGRAM ERROR: run = %d in decode_block", run); /* Flawfinder: ignore */
- H261ErrMsg( msg );
- return( H261_ERROR );
- } )
- outsym[isym++] = insym[(*nextsym)++];
- }
- zzpos += run + 1;
- //printf("decode_block next: "); printsym( insym[*nextsym] );
- //printf(" zzpos = %dn", zzpos);
- if (zzpos > 64) { // If we decoded coeff. 63, we will now have zzpos=64
- BS_ERR_EXIT( sprintf( msg, "decode_block: Bitstream error, zzpos=%d", zzpos); /* Flawfinder: ignore */
- H261ErrMsg( msg ); )
- return (H261_ERROR);
- }
- }
- (*nextsym)++; /* Advance pointer to symbol after EOB */
- block->sym = outsym;
- block->nsym = isym;
- return (isym);
- }