aacdec_hcrs.h - Android社区 - https://www.androidos.net.cn/

/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

1.    INTRODUCTION
The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
This FDK AAC Codec software is intended to be used on a wide variety of Android devices.

AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
of the MPEG specifications.

Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
individually for the purpose of encoding or decoding bit streams in products that are compliant with
the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
software may already be covered under those patent licenses when it is used for those licensed purposes only.

Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
applications information and documentation.

2.    COPYRIGHT LICENSE

Redistribution and use in source and binary forms, with or without modification, are permitted without
payment of copyright license fees provided that you satisfy the following conditions:

You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
your modifications thereto in source code form.

You must retain the complete text of this software license in the documentation and/or other materials
provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
modifications thereto to recipients of copies in binary form.

The name of Fraunhofer may not be used to endorse or promote products derived from this library without
prior written permission.

You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
software or your modifications thereto.

Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
and the date of any change. For modified versions of the FDK AAC Codec, the term
"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."

3.    NO PATENT LICENSE

NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
respect to this software.

You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
by appropriate patent licenses.

4.    DISCLAIMER

This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
or business interruption, however caused and on any theory of liability, whether in contract, strict
liability, or tort (including negligence), arising in any way out of the use of this software, even if
advised of the possibility of such damage.

5.    CONTACT INFORMATION

Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
91058 Erlangen, Germany

www.iis.fraunhofer.de/amm
amm-info@iis.fraunhofer.de
----------------------------------------------------------------------------------------------------------- */

/*****************************  MPEG-4 AAC Decoder  ***************************

Author(s):   Robert Weidner (DSP Solutions)
   Description: HCR Decoder: Defines of state-constants, masks and
                state-prototypes

*******************************************************************************/

#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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