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/*
* ttadec.h
*
* Description: TTAv1 decoder definitions and prototypes
* Developed by: Alexander Djourik <sasha@iszf.irk.ru>
* Pavel Zhilin <pzh@iszf.irk.ru>
*
* Copyright (c) 1999-2004 Alexander Djourik. All rights reserved.
*
*/
/*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Please see the file COPYING in this directory for full copyright
* information.
*/
#ifndef TTADEC_H_
#define TTADEC_H_
#ifdef _WIN32
#pragma pack(1)
#define __ATTRIBUTE_PACKED__
#else
#define __ATTRIBUTE_PACKED__ __attribute__((packed))
#endif
#define TTA1_SIGN 0x31415454
#define FRAME_TIME 1.04489795918367346939
#define MAX_ORDER 8
#ifndef WAVE_FORMAT_PCM
#define WAVE_FORMAT_PCM 1
#endif
#ifdef _WIN32
typedef unsigned __int64 uint64;
#else
typedef unsigned long long uint64;
#endif
/**
* moved to gstttadec.c to silence gcc warnings
*/
/*
static const unsigned long bit_mask[] = {
0x00000000, 0x00000001, 0x00000003, 0x00000007,
0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f,
0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff,
0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff,
0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff,
0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff,
0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff,
0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff,
0xffffffff
};
static const unsigned long bit_shift[] = {
0x00000001, 0x00000002, 0x00000004, 0x00000008,
0x00000010, 0x00000020, 0x00000040, 0x00000080,
0x00000100, 0x00000200, 0x00000400, 0x00000800,
0x00001000, 0x00002000, 0x00004000, 0x00008000,
0x00010000, 0x00020000, 0x00040000, 0x00080000,
0x00100000, 0x00200000, 0x00400000, 0x00800000,
0x01000000, 0x02000000, 0x04000000, 0x08000000,
0x10000000, 0x20000000, 0x40000000, 0x80000000,
0x80000000, 0x80000000, 0x80000000, 0x80000000,
0x80000000, 0x80000000, 0x80000000, 0x80000000
};
static const unsigned long *shift_16 = bit_shift + 4;
*/
typedef unsigned char byte;
#ifdef _BIG_ENDIAN
#define ENDSWAP_INT16(x) (((((x)>>8)&0xFF)|(((x)&0xFF)<<8)))
#define ENDSWAP_INT32(x) (((((x)>>24)&0xFF)|(((x)>>8)&0xFF00)|(((x)&0xFF00)<<8)|(((x)&0xFF)<<24)))
#define WRITE_BUFFER(x, bsize, out) { \
if (bsize > 2) *out++ = (byte)(*x >> 16); \
if (bsize > 1) *out++ = (byte)(*x >> 8); \
*out++ = (byte) *x; }
#else
#define ENDSWAP_INT16(x) (x)
#define ENDSWAP_INT32(x) (x)
#define WRITE_BUFFER(x, bsize, out) { \
*out++ = (byte) *x; \
if (bsize > 1) *out++ = (byte)(*x >> 8); \
if (bsize > 2) *out++ = (byte)(*x >> 16); }
#endif
#define PREDICTOR1(x, k) ((long)((((uint64)x << k) - x) >> k))
#define DEC(x) (((x)&1)?(++(x)>>1):(-(x)>>1))
#if 0
/* This doesn't compile on non-gcc compilers */
typedef struct {
unsigned long TTAid;
unsigned short AudioFormat;
unsigned short NumChannels;
unsigned short BitsPerSample;
unsigned long SampleRate;
unsigned long DataLength;
unsigned long CRC32;
} __ATTRIBUTE_PACKED__ tta_hdr;
#endif
typedef struct {
unsigned long k0;
unsigned long k1;
unsigned long sum0;
unsigned long sum1;
} adapt;
typedef struct {
long shift;
long round;
long error;
long mutex;
long qm[MAX_ORDER+1];
long dx[MAX_ORDER+1];
long dl[MAX_ORDER+1];
} fltst;
typedef struct {
fltst fst;
adapt rice;
long last;
} decoder;
#endif /* TTADEC_H_ */
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