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/***************************** MPEG-4 AAC Decoder ***************************
(C) Copyright Fraunhofer IIS 2000-2008
All Rights Reserved
Please be advised that this software and/or program delivery is
Confidential Information of Fraunhofer and subject to and covered by the
Fraunhofer IIS Software Evaluation Agreement
between Google Inc. and Fraunhofer
effective and in full force since March 1, 2012.
You may use this software and/or program only under the terms and
conditions described in the above mentioned Fraunhofer IIS Software
Evaluation Agreement. Any other and/or further use requires a separate agreement.
$Id$
Author(s): Robert Weidner (DSP Solutions)
Description: HCR Decoder: Defines of state-constants, masks and
state-prototypes
This software and/or program is protected by copyright law and international
treaties. Any reproduction or distribution of this software and/or program,
or any portion of it, may result in severe civil and criminal penalties, and
will be prosecuted to the maximum extent possible under law.
*******************************************************************************/
#ifndef _AACDEC_HCRS_H_
#define _AACDEC_HCRS_H_
#include "FDK_bitstream.h"
#include "aacdec_hcr_types.h"
/* The four different kinds of types of states are: */
/* different states are defined as constants */ /* start middle=self next stop */
#define STOP_THIS_STATE 0 /* */
#define BODY_ONLY 1 /* X X X */
#define BODY_SIGN__BODY 2 /* X X X X [stop if no sign] */
#define BODY_SIGN__SIGN 3 /* X X [stop if sign bits decoded] */
#define BODY_SIGN_ESC__BODY 4 /* X X X X [stop if no sign] */
#define BODY_SIGN_ESC__SIGN 5 /* X X X [stop if no escape sequence] */
#define BODY_SIGN_ESC__ESC_PREFIX 6 /* X X */
#define BODY_SIGN_ESC__ESC_WORD 7 /* X X X [stop if abs(second qsc) != 16] */
/* examples: */
/* BODY_ONLY means only the codeword body will be decoded; no sign bits will follow and no escapesequence will follow */
/* BODY_SIGN__BODY means that the codeword consists of two parts; body and sign part. The part '__BODY' after the two underscores shows */
/* that the bits which are currently decoded belong to the '__BODY' of the codeword and not to the sign part. */
/* BODY_SIGN_ESC__ESC_PB means that the codeword consists of three parts; body, sign and (here: two) escape sequences; */
/* P = Prefix = ones */
/* W = Escape Word */
/* A = first possible (of two) Escape sequeces */
/* B = second possible (of two) Escape sequeces */
/* The part after the two underscores shows that the current bits which are decoded belong to the '__ESC_PB' - part of the */
/* codeword. That means the body and the sign bits are decoded completely and the bits which are decoded now belong to */
/* the escape sequence [P = prefix; B=second possible escape sequence] */
#define MSB_31_MASK 0x80000000 /* masks MSB (= Bit 31) in a 32 bit word */
#define DIMENSION_OF_ESCAPE_CODEBOOK 2 /* for cb >= 11 is dimension 2 */
#define ESCAPE_CODEBOOK 11
#define MASK_ESCAPE_PREFIX_UP 0x000F0000
#define LSB_ESCAPE_PREFIX_UP 16
#define MASK_ESCAPE_PREFIX_DOWN 0x0000F000
#define LSB_ESCAPE_PREFIX_DOWN 12
#define MASK_ESCAPE_WORD 0x00000FFF
#define MASK_FLAG_A 0x00200000
#define MASK_FLAG_B 0x00100000
extern void DecodeNonPCWs(HANDLE_FDK_BITSTREAM bs, H_HCR_INFO hHcr);
UINT Hcr_State_BODY_ONLY (HANDLE_FDK_BITSTREAM, void*);
UINT Hcr_State_BODY_SIGN__BODY (HANDLE_FDK_BITSTREAM, void*);
UINT Hcr_State_BODY_SIGN__SIGN (HANDLE_FDK_BITSTREAM, void*);
UINT Hcr_State_BODY_SIGN_ESC__BODY (HANDLE_FDK_BITSTREAM, void*);
UINT Hcr_State_BODY_SIGN_ESC__SIGN (HANDLE_FDK_BITSTREAM, void*);
UINT Hcr_State_BODY_SIGN_ESC__ESC_PREFIX (HANDLE_FDK_BITSTREAM, void*);
UINT Hcr_State_BODY_SIGN_ESC__ESC_WORD (HANDLE_FDK_BITSTREAM, void*);
#endif /* _AACDEC_HCRS_H_ */
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